fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/xattr.h>
  55 #include <linux/utsname.h>
  56 #include <linux/freezer.h>
  57 #include <linux/iversion.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4idmap.h"
  67 #include "nfs4session.h"
  68 #include "fscache.h"
  69
  70 #include "nfs4trace.h"
  71
  72 #define NFSDBG_FACILITY         NFSDBG_PROC
  73
  74 #define NFS4_BITMASK_SZ         3
  75
  76 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  77 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  78
  79 /* file attributes which can be mapped to nfs attributes */
  80 #define NFS4_VALID_ATTRS (ATTR_MODE \
  81         | ATTR_UID \
  82         | ATTR_GID \
  83         | ATTR_SIZE \
  84         | ATTR_ATIME \
  85         | ATTR_MTIME \
  86         | ATTR_CTIME \
  87         | ATTR_ATIME_SET \
  88         | ATTR_MTIME_SET)
  89
  90 struct nfs4_opendata;
  91 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  92 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  93 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  94 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label, struct inode *inode);
  95 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label, struct inode *inode);
  96 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
  97                             struct nfs_fattr *fattr, struct iattr *sattr,
  98                             struct nfs_open_context *ctx, struct nfs4_label *ilabel,
  99                             struct nfs4_label *olabel);
 100 #ifdef CONFIG_NFS_V4_1
 101 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
 102                 const struct cred *cred,
 103                 struct nfs4_slot *slot,
 104                 bool is_privileged);
 105 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 106                 const struct cred *);
 107 static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
 108                 const struct cred *, bool);
 109 #endif
 110
 111 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 112 static inline struct nfs4_label *
 113 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 114         struct iattr *sattr, struct nfs4_label *label)
 115 {
 116         int err;
 117
 118         if (label == NULL)
 119                 return NULL;
 120
 121         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 122                 return NULL;
 123
 124         err = security_dentry_init_security(dentry, sattr->ia_mode,
 125                                 &dentry->d_name, (void **)&label->label, &label->len);
 126         if (err == 0)
 127                 return label;
 128
 129         return NULL;
 130 }
 131 static inline void
 132 nfs4_label_release_security(struct nfs4_label *label)
 133 {
 134         if (label)
 135                 security_release_secctx(label->label, label->len);
 136 }
 137 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 138 {
 139         if (label)
 140                 return server->attr_bitmask;
 141
 142         return server->attr_bitmask_nl;
 143 }
 144 #else
 145 static inline struct nfs4_label *
 146 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 147         struct iattr *sattr, struct nfs4_label *l)
 148 { return NULL; }
 149 static inline void
 150 nfs4_label_release_security(struct nfs4_label *label)
 151 { return; }
 152 static inline u32 *
 153 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 154 { return server->attr_bitmask; }
 155 #endif
 156
 157 /* Prevent leaks of NFSv4 errors into userland */
 158 static int nfs4_map_errors(int err)
 159 {
 160         if (err >= -1000)
 161                 return err;
 162         switch (err) {
 163         case -NFS4ERR_RESOURCE:
 164         case -NFS4ERR_LAYOUTTRYLATER:
 165         case -NFS4ERR_RECALLCONFLICT:
 166                 return -EREMOTEIO;
 167         case -NFS4ERR_WRONGSEC:
 168         case -NFS4ERR_WRONG_CRED:
 169                 return -EPERM;
 170         case -NFS4ERR_BADOWNER:
 171         case -NFS4ERR_BADNAME:
 172                 return -EINVAL;
 173         case -NFS4ERR_SHARE_DENIED:
 174                 return -EACCES;
 175         case -NFS4ERR_MINOR_VERS_MISMATCH:
 176                 return -EPROTONOSUPPORT;
 177         case -NFS4ERR_FILE_OPEN:
 178                 return -EBUSY;
 179         default:
 180                 dprintk("%s could not handle NFSv4 error %d\n",
 181                                 __func__, -err);
 182                 break;
 183         }
 184         return -EIO;
 185 }
 186
 187 /*
 188  * This is our standard bitmap for GETATTR requests.
 189  */
 190 const u32 nfs4_fattr_bitmap[3] = {
 191         FATTR4_WORD0_TYPE
 192         | FATTR4_WORD0_CHANGE
 193         | FATTR4_WORD0_SIZE
 194         | FATTR4_WORD0_FSID
 195         | FATTR4_WORD0_FILEID,
 196         FATTR4_WORD1_MODE
 197         | FATTR4_WORD1_NUMLINKS
 198         | FATTR4_WORD1_OWNER
 199         | FATTR4_WORD1_OWNER_GROUP
 200         | FATTR4_WORD1_RAWDEV
 201         | FATTR4_WORD1_SPACE_USED
 202         | FATTR4_WORD1_TIME_ACCESS
 203         | FATTR4_WORD1_TIME_METADATA
 204         | FATTR4_WORD1_TIME_MODIFY
 205         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 206 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 207         FATTR4_WORD2_SECURITY_LABEL
 208 #endif
 209 };
 210
 211 static const u32 nfs4_pnfs_open_bitmap[3] = {
 212         FATTR4_WORD0_TYPE
 213         | FATTR4_WORD0_CHANGE
 214         | FATTR4_WORD0_SIZE
 215         | FATTR4_WORD0_FSID
 216         | FATTR4_WORD0_FILEID,
 217         FATTR4_WORD1_MODE
 218         | FATTR4_WORD1_NUMLINKS
 219         | FATTR4_WORD1_OWNER
 220         | FATTR4_WORD1_OWNER_GROUP
 221         | FATTR4_WORD1_RAWDEV
 222         | FATTR4_WORD1_SPACE_USED
 223         | FATTR4_WORD1_TIME_ACCESS
 224         | FATTR4_WORD1_TIME_METADATA
 225         | FATTR4_WORD1_TIME_MODIFY,
 226         FATTR4_WORD2_MDSTHRESHOLD
 227 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 228         | FATTR4_WORD2_SECURITY_LABEL
 229 #endif
 230 };
 231
 232 static const u32 nfs4_open_noattr_bitmap[3] = {
 233         FATTR4_WORD0_TYPE
 234         | FATTR4_WORD0_FILEID,
 235 };
 236
 237 const u32 nfs4_statfs_bitmap[3] = {
 238         FATTR4_WORD0_FILES_AVAIL
 239         | FATTR4_WORD0_FILES_FREE
 240         | FATTR4_WORD0_FILES_TOTAL,
 241         FATTR4_WORD1_SPACE_AVAIL
 242         | FATTR4_WORD1_SPACE_FREE
 243         | FATTR4_WORD1_SPACE_TOTAL
 244 };
 245
 246 const u32 nfs4_pathconf_bitmap[3] = {
 247         FATTR4_WORD0_MAXLINK
 248         | FATTR4_WORD0_MAXNAME,
 249         0
 250 };
 251
 252 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 253                         | FATTR4_WORD0_MAXREAD
 254                         | FATTR4_WORD0_MAXWRITE
 255                         | FATTR4_WORD0_LEASE_TIME,
 256                         FATTR4_WORD1_TIME_DELTA
 257                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 258                         FATTR4_WORD2_LAYOUT_BLKSIZE
 259                         | FATTR4_WORD2_CLONE_BLKSIZE
 260 };
 261
 262 const u32 nfs4_fs_locations_bitmap[3] = {
 263         FATTR4_WORD0_CHANGE
 264         | FATTR4_WORD0_SIZE
 265         | FATTR4_WORD0_FSID
 266         | FATTR4_WORD0_FILEID
 267         | FATTR4_WORD0_FS_LOCATIONS,
 268         FATTR4_WORD1_OWNER
 269         | FATTR4_WORD1_OWNER_GROUP
 270         | FATTR4_WORD1_RAWDEV
 271         | FATTR4_WORD1_SPACE_USED
 272         | FATTR4_WORD1_TIME_ACCESS
 273         | FATTR4_WORD1_TIME_METADATA
 274         | FATTR4_WORD1_TIME_MODIFY
 275         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 276 };
 277
 278 static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
 279                 struct inode *inode)
 280 {
 281         unsigned long cache_validity;
 282
 283         memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
 284         if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
 285                 return;
 286
 287         cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
 288         if (!(cache_validity & NFS_INO_REVAL_FORCED))
 289                 cache_validity &= ~(NFS_INO_INVALID_CHANGE
 290                                 | NFS_INO_INVALID_SIZE);
 291
 292         if (!(cache_validity & NFS_INO_INVALID_SIZE))
 293                 dst[0] &= ~FATTR4_WORD0_SIZE;
 294
 295         if (!(cache_validity & NFS_INO_INVALID_CHANGE))
 296                 dst[0] &= ~FATTR4_WORD0_CHANGE;
 297 }
 298
 299 static void nfs4_bitmap_copy_adjust_setattr(__u32 *dst,
 300                 const __u32 *src, struct inode *inode)
 301 {
 302         nfs4_bitmap_copy_adjust(dst, src, inode);
 303 }
 304
 305 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 306                 struct nfs4_readdir_arg *readdir)
 307 {
 308         unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
 309         __be32 *start, *p;
 310
 311         if (cookie > 2) {
 312                 readdir->cookie = cookie;
 313                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 314                 return;
 315         }
 316
 317         readdir->cookie = 0;
 318         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 319         if (cookie == 2)
 320                 return;
 321
 322         /*
 323          * NFSv4 servers do not return entries for '.' and '..'
 324          * Therefore, we fake these entries here.  We let '.'
 325          * have cookie 0 and '..' have cookie 1.  Note that
 326          * when talking to the server, we always send cookie 0
 327          * instead of 1 or 2.
 328          */
 329         start = p = kmap_atomic(*readdir->pages);
 330
 331         if (cookie == 0) {
 332                 *p++ = xdr_one;                                  /* next */
 333                 *p++ = xdr_zero;                   /* cookie, first word */
 334                 *p++ = xdr_one;                   /* cookie, second word */
 335                 *p++ = xdr_one;                             /* entry len */
 336                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 337                 p++;
 338                 *p++ = xdr_one;                         /* bitmap length */
 339                 *p++ = htonl(attrs);                           /* bitmap */
 340                 *p++ = htonl(12);             /* attribute buffer length */
 341                 *p++ = htonl(NF4DIR);
 342                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 343         }
 344
 345         *p++ = xdr_one;                                  /* next */
 346         *p++ = xdr_zero;                   /* cookie, first word */
 347         *p++ = xdr_two;                   /* cookie, second word */
 348         *p++ = xdr_two;                             /* entry len */
 349         memcpy(p, "..\0\0", 4);                         /* entry */
 350         p++;
 351         *p++ = xdr_one;                         /* bitmap length */
 352         *p++ = htonl(attrs);                           /* bitmap */
 353         *p++ = htonl(12);             /* attribute buffer length */
 354         *p++ = htonl(NF4DIR);
 355         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 356
 357         readdir->pgbase = (char *)p - (char *)start;
 358         readdir->count -= readdir->pgbase;
 359         kunmap_atomic(start);
 360 }
 361
 362 static void nfs4_test_and_free_stateid(struct nfs_server *server,
 363                 nfs4_stateid *stateid,
 364                 const struct cred *cred)
 365 {
 366         const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
 367
 368         ops->test_and_free_expired(server, stateid, cred);
 369 }
 370
 371 static void __nfs4_free_revoked_stateid(struct nfs_server *server,
 372                 nfs4_stateid *stateid,
 373                 const struct cred *cred)
 374 {
 375         stateid->type = NFS4_REVOKED_STATEID_TYPE;
 376         nfs4_test_and_free_stateid(server, stateid, cred);
 377 }
 378
 379 static void nfs4_free_revoked_stateid(struct nfs_server *server,
 380                 const nfs4_stateid *stateid,
 381                 const struct cred *cred)
 382 {
 383         nfs4_stateid tmp;
 384
 385         nfs4_stateid_copy(&tmp, stateid);
 386         __nfs4_free_revoked_stateid(server, &tmp, cred);
 387 }
 388
 389 static long nfs4_update_delay(long *timeout)
 390 {
 391         long ret;
 392         if (!timeout)
 393                 return NFS4_POLL_RETRY_MAX;
 394         if (*timeout <= 0)
 395                 *timeout = NFS4_POLL_RETRY_MIN;
 396         if (*timeout > NFS4_POLL_RETRY_MAX)
 397                 *timeout = NFS4_POLL_RETRY_MAX;
 398         ret = *timeout;
 399         *timeout <<= 1;
 400         return ret;
 401 }
 402
 403 static int nfs4_delay_killable(long *timeout)
 404 {
 405         might_sleep();
 406
 407         freezable_schedule_timeout_killable_unsafe(
 408                 nfs4_update_delay(timeout));
 409         if (!__fatal_signal_pending(current))
 410                 return 0;
 411         return -EINTR;
 412 }
 413
 414 static int nfs4_delay_interruptible(long *timeout)
 415 {
 416         might_sleep();
 417
 418         freezable_schedule_timeout_interruptible(nfs4_update_delay(timeout));
 419         if (!signal_pending(current))
 420                 return 0;
 421         return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
 422 }
 423
 424 static int nfs4_delay(long *timeout, bool interruptible)
 425 {
 426         if (interruptible)
 427                 return nfs4_delay_interruptible(timeout);
 428         return nfs4_delay_killable(timeout);
 429 }
 430
 431 static const nfs4_stateid *
 432 nfs4_recoverable_stateid(const nfs4_stateid *stateid)
 433 {
 434         if (!stateid)
 435                 return NULL;
 436         switch (stateid->type) {
 437         case NFS4_OPEN_STATEID_TYPE:
 438         case NFS4_LOCK_STATEID_TYPE:
 439         case NFS4_DELEGATION_STATEID_TYPE:
 440                 return stateid;
 441         default:
 442                 break;
 443         }
 444         return NULL;
 445 }
 446
 447 /* This is the error handling routine for processes that are allowed
 448  * to sleep.
 449  */
 450 static int nfs4_do_handle_exception(struct nfs_server *server,
 451                 int errorcode, struct nfs4_exception *exception)
 452 {
 453         struct nfs_client *clp = server->nfs_client;
 454         struct nfs4_state *state = exception->state;
 455         const nfs4_stateid *stateid;
 456         struct inode *inode = exception->inode;
 457         int ret = errorcode;
 458
 459         exception->delay = 0;
 460         exception->recovering = 0;
 461         exception->retry = 0;
 462
 463         stateid = nfs4_recoverable_stateid(exception->stateid);
 464         if (stateid == NULL && state != NULL)
 465                 stateid = nfs4_recoverable_stateid(&state->stateid);
 466
 467         switch(errorcode) {
 468                 case 0:
 469                         return 0;
 470                 case -NFS4ERR_BADHANDLE:
 471                 case -ESTALE:
 472                         if (inode != NULL && S_ISREG(inode->i_mode))
 473                                 pnfs_destroy_layout(NFS_I(inode));
 474                         break;
 475                 case -NFS4ERR_DELEG_REVOKED:
 476                 case -NFS4ERR_ADMIN_REVOKED:
 477                 case -NFS4ERR_EXPIRED:
 478                 case -NFS4ERR_BAD_STATEID:
 479                         if (inode != NULL && stateid != NULL) {
 480                                 nfs_inode_find_state_and_recover(inode,
 481                                                 stateid);
 482                                 goto wait_on_recovery;
 483                         }
 484                         /* Fall through */
 485                 case -NFS4ERR_OPENMODE:
 486                         if (inode) {
 487                                 int err;
 488
 489                                 err = nfs_async_inode_return_delegation(inode,
 490                                                 stateid);
 491                                 if (err == 0)
 492                                         goto wait_on_recovery;
 493                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 494                                         exception->retry = 1;
 495                                         break;
 496                                 }
 497                         }
 498                         if (state == NULL)
 499                                 break;
 500                         ret = nfs4_schedule_stateid_recovery(server, state);
 501                         if (ret < 0)
 502                                 break;
 503                         goto wait_on_recovery;
 504                 case -NFS4ERR_STALE_STATEID:
 505                 case -NFS4ERR_STALE_CLIENTID:
 506                         nfs4_schedule_lease_recovery(clp);
 507                         goto wait_on_recovery;
 508                 case -NFS4ERR_MOVED:
 509                         ret = nfs4_schedule_migration_recovery(server);
 510                         if (ret < 0)
 511                                 break;
 512                         goto wait_on_recovery;
 513                 case -NFS4ERR_LEASE_MOVED:
 514                         nfs4_schedule_lease_moved_recovery(clp);
 515                         goto wait_on_recovery;
 516 #if defined(CONFIG_NFS_V4_1)
 517                 case -NFS4ERR_BADSESSION:
 518                 case -NFS4ERR_BADSLOT:
 519                 case -NFS4ERR_BAD_HIGH_SLOT:
 520                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 521                 case -NFS4ERR_DEADSESSION:
 522                 case -NFS4ERR_SEQ_FALSE_RETRY:
 523                 case -NFS4ERR_SEQ_MISORDERED:
 524                         dprintk("%s ERROR: %d Reset session\n", __func__,
 525                                 errorcode);
 526                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 527                         goto wait_on_recovery;
 528 #endif /* defined(CONFIG_NFS_V4_1) */
 529                 case -NFS4ERR_FILE_OPEN:
 530                         if (exception->timeout > HZ) {
 531                                 /* We have retried a decent amount, time to
 532                                  * fail
 533                                  */
 534                                 ret = -EBUSY;
 535                                 break;
 536                         }
 537                         /* Fall through */
 538                 case -NFS4ERR_DELAY:
 539                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 540                         /* Fall through */
 541                 case -NFS4ERR_GRACE:
 542                 case -NFS4ERR_LAYOUTTRYLATER:
 543                 case -NFS4ERR_RECALLCONFLICT:
 544                         exception->delay = 1;
 545                         return 0;
 546
 547                 case -NFS4ERR_RETRY_UNCACHED_REP:
 548                 case -NFS4ERR_OLD_STATEID:
 549                         exception->retry = 1;
 550                         break;
 551                 case -NFS4ERR_BADOWNER:
 552                         /* The following works around a Linux server bug! */
 553                 case -NFS4ERR_BADNAME:
 554                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 555                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 556                                 exception->retry = 1;
 557                                 printk(KERN_WARNING "NFS: v4 server %s "
 558                                                 "does not accept raw "
 559                                                 "uid/gids. "
 560                                                 "Reenabling the idmapper.\n",
 561                                                 server->nfs_client->cl_hostname);
 562                         }
 563         }
 564         /* We failed to handle the error */
 565         return nfs4_map_errors(ret);
 566 wait_on_recovery:
 567         exception->recovering = 1;
 568         return 0;
 569 }
 570
 571 /* This is the error handling routine for processes that are allowed
 572  * to sleep.
 573  */
 574 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 575 {
 576         struct nfs_client *clp = server->nfs_client;
 577         int ret;
 578
 579         ret = nfs4_do_handle_exception(server, errorcode, exception);
 580         if (exception->delay) {
 581                 ret = nfs4_delay(&exception->timeout,
 582                                 exception->interruptible);
 583                 goto out_retry;
 584         }
 585         if (exception->recovering) {
 586                 ret = nfs4_wait_clnt_recover(clp);
 587                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 588                         return -EIO;
 589                 goto out_retry;
 590         }
 591         return ret;
 592 out_retry:
 593         if (ret == 0)
 594                 exception->retry = 1;
 595         return ret;
 596 }
 597
 598 static int
 599 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 600                 int errorcode, struct nfs4_exception *exception)
 601 {
 602         struct nfs_client *clp = server->nfs_client;
 603         int ret;
 604
 605         ret = nfs4_do_handle_exception(server, errorcode, exception);
 606         if (exception->delay) {
 607                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 608                 goto out_retry;
 609         }
 610         if (exception->recovering) {
 611                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 612                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 613                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 614                 goto out_retry;
 615         }
 616         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 617                 ret = -EIO;
 618         return ret;
 619 out_retry:
 620         if (ret == 0) {
 621                 exception->retry = 1;
 622                 /*
 623                  * For NFS4ERR_MOVED, the client transport will need to
 624                  * be recomputed after migration recovery has completed.
 625                  */
 626                 if (errorcode == -NFS4ERR_MOVED)
 627                         rpc_task_release_transport(task);
 628         }
 629         return ret;
 630 }
 631
 632 int
 633 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 634                         struct nfs4_state *state, long *timeout)
 635 {
 636         struct nfs4_exception exception = {
 637                 .state = state,
 638         };
 639
 640         if (task->tk_status >= 0)
 641                 return 0;
 642         if (timeout)
 643                 exception.timeout = *timeout;
 644         task->tk_status = nfs4_async_handle_exception(task, server,
 645                         task->tk_status,
 646                         &exception);
 647         if (exception.delay && timeout)
 648                 *timeout = exception.timeout;
 649         if (exception.retry)
 650                 return -EAGAIN;
 651         return 0;
 652 }
 653
 654 /*
 655  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 656  * or 'false' otherwise.
 657  */
 658 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 659 {
 660         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 661         return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
 662 }
 663
 664 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 665 {
 666         spin_lock(&clp->cl_lock);
 667         if (time_before(clp->cl_last_renewal,timestamp))
 668                 clp->cl_last_renewal = timestamp;
 669         spin_unlock(&clp->cl_lock);
 670 }
 671
 672 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 673 {
 674         struct nfs_client *clp = server->nfs_client;
 675
 676         if (!nfs4_has_session(clp))
 677                 do_renew_lease(clp, timestamp);
 678 }
 679
 680 struct nfs4_call_sync_data {
 681         const struct nfs_server *seq_server;
 682         struct nfs4_sequence_args *seq_args;
 683         struct nfs4_sequence_res *seq_res;
 684 };
 685
 686 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 687                         struct nfs4_sequence_res *res, int cache_reply,
 688                         int privileged)
 689 {
 690         args->sa_slot = NULL;
 691         args->sa_cache_this = cache_reply;
 692         args->sa_privileged = privileged;
 693
 694         res->sr_slot = NULL;
 695 }
 696
 697 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 698 {
 699         struct nfs4_slot *slot = res->sr_slot;
 700         struct nfs4_slot_table *tbl;
 701
 702         tbl = slot->table;
 703         spin_lock(&tbl->slot_tbl_lock);
 704         if (!nfs41_wake_and_assign_slot(tbl, slot))
 705                 nfs4_free_slot(tbl, slot);
 706         spin_unlock(&tbl->slot_tbl_lock);
 707
 708         res->sr_slot = NULL;
 709 }
 710
 711 static int nfs40_sequence_done(struct rpc_task *task,
 712                                struct nfs4_sequence_res *res)
 713 {
 714         if (res->sr_slot != NULL)
 715                 nfs40_sequence_free_slot(res);
 716         return 1;
 717 }
 718
 719 #if defined(CONFIG_NFS_V4_1)
 720
 721 static void nfs41_release_slot(struct nfs4_slot *slot)
 722 {
 723         struct nfs4_session *session;
 724         struct nfs4_slot_table *tbl;
 725         bool send_new_highest_used_slotid = false;
 726
 727         if (!slot)
 728                 return;
 729         tbl = slot->table;
 730         session = tbl->session;
 731
 732         /* Bump the slot sequence number */
 733         if (slot->seq_done)
 734                 slot->seq_nr++;
 735         slot->seq_done = 0;
 736
 737         spin_lock(&tbl->slot_tbl_lock);
 738         /* Be nice to the server: try to ensure that the last transmitted
 739          * value for highest_user_slotid <= target_highest_slotid
 740          */
 741         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 742                 send_new_highest_used_slotid = true;
 743
 744         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 745                 send_new_highest_used_slotid = false;
 746                 goto out_unlock;
 747         }
 748         nfs4_free_slot(tbl, slot);
 749
 750         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 751                 send_new_highest_used_slotid = false;
 752 out_unlock:
 753         spin_unlock(&tbl->slot_tbl_lock);
 754         if (send_new_highest_used_slotid)
 755                 nfs41_notify_server(session->clp);
 756         if (waitqueue_active(&tbl->slot_waitq))
 757                 wake_up_all(&tbl->slot_waitq);
 758 }
 759
 760 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 761 {
 762         nfs41_release_slot(res->sr_slot);
 763         res->sr_slot = NULL;
 764 }
 765
 766 static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
 767                 u32 seqnr)
 768 {
 769         if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
 770                 slot->seq_nr_highest_sent = seqnr;
 771 }
 772 static void nfs4_slot_sequence_acked(struct nfs4_slot *slot,
 773                 u32 seqnr)
 774 {
 775         slot->seq_nr_highest_sent = seqnr;
 776         slot->seq_nr_last_acked = seqnr;
 777 }
 778
 779 static int nfs41_sequence_process(struct rpc_task *task,
 780                 struct nfs4_sequence_res *res)
 781 {
 782         struct nfs4_session *session;
 783         struct nfs4_slot *slot = res->sr_slot;
 784         struct nfs_client *clp;
 785         int ret = 1;
 786
 787         if (slot == NULL)
 788                 goto out_noaction;
 789         /* don't increment the sequence number if the task wasn't sent */
 790         if (!RPC_WAS_SENT(task) || slot->seq_done)
 791                 goto out;
 792
 793         session = slot->table->session;
 794
 795         trace_nfs4_sequence_done(session, res);
 796         /* Check the SEQUENCE operation status */
 797         switch (res->sr_status) {
 798         case 0:
 799                 /* Mark this sequence number as having been acked */
 800                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 801                 /* Update the slot's sequence and clientid lease timer */
 802                 slot->seq_done = 1;
 803                 clp = session->clp;
 804                 do_renew_lease(clp, res->sr_timestamp);
 805                 /* Check sequence flags */
 806                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 807                                 !!slot->privileged);
 808                 nfs41_update_target_slotid(slot->table, slot, res);
 809                 break;
 810         case 1:
 811                 /*
 812                  * sr_status remains 1 if an RPC level error occurred.
 813                  * The server may or may not have processed the sequence
 814                  * operation..
 815                  */
 816                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 817                 slot->seq_done = 1;
 818                 goto out;
 819         case -NFS4ERR_DELAY:
 820                 /* The server detected a resend of the RPC call and
 821                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 822                  * of RFC5661.
 823                  */
 824                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 825                         __func__,
 826                         slot->slot_nr,
 827                         slot->seq_nr);
 828                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 829                 goto out_retry;
 830         case -NFS4ERR_RETRY_UNCACHED_REP:
 831         case -NFS4ERR_SEQ_FALSE_RETRY:
 832                 /*
 833                  * The server thinks we tried to replay a request.
 834                  * Retry the call after bumping the sequence ID.
 835                  */
 836                 nfs4_slot_sequence_acked(slot, slot->seq_nr);
 837                 goto retry_new_seq;
 838         case -NFS4ERR_BADSLOT:
 839                 /*
 840                  * The slot id we used was probably retired. Try again
 841                  * using a different slot id.
 842                  */
 843                 if (slot->slot_nr < slot->table->target_highest_slotid)
 844                         goto session_recover;
 845                 goto retry_nowait;
 846         case -NFS4ERR_SEQ_MISORDERED:
 847                 nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
 848                 /*
 849                  * Were one or more calls using this slot interrupted?
 850                  * If the server never received the request, then our
 851                  * transmitted slot sequence number may be too high.
 852                  */
 853                 if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
 854                         slot->seq_nr--;
 855                         goto retry_nowait;
 856                 }
 857                 /*
 858                  * RFC5661:
 859                  * A retry might be sent while the original request is
 860                  * still in progress on the replier. The replier SHOULD
 861                  * deal with the issue by returning NFS4ERR_DELAY as the
 862                  * reply to SEQUENCE or CB_SEQUENCE operation, but
 863                  * implementations MAY return NFS4ERR_SEQ_MISORDERED.
 864                  *
 865                  * Restart the search after a delay.
 866                  */
 867                 slot->seq_nr = slot->seq_nr_highest_sent;
 868                 goto out_retry;
 869         default:
 870                 /* Just update the slot sequence no. */
 871                 slot->seq_done = 1;
 872         }
 873 out:
 874         /* The session may be reset by one of the error handlers. */
 875         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 876 out_noaction:
 877         return ret;
 878 session_recover:
 879         nfs4_schedule_session_recovery(session, res->sr_status);
 880         goto retry_nowait;
 881 retry_new_seq:
 882         ++slot->seq_nr;
 883 retry_nowait:
 884         if (rpc_restart_call_prepare(task)) {
 885                 nfs41_sequence_free_slot(res);
 886                 task->tk_status = 0;
 887                 ret = 0;
 888         }
 889         goto out;
 890 out_retry:
 891         if (!rpc_restart_call(task))
 892                 goto out;
 893         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 894         return 0;
 895 }
 896
 897 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 898 {
 899         if (!nfs41_sequence_process(task, res))
 900                 return 0;
 901         if (res->sr_slot != NULL)
 902                 nfs41_sequence_free_slot(res);
 903         return 1;
 904
 905 }
 906 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 907
 908 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 909 {
 910         if (res->sr_slot == NULL)
 911                 return 1;
 912         if (res->sr_slot->table->session != NULL)
 913                 return nfs41_sequence_process(task, res);
 914         return nfs40_sequence_done(task, res);
 915 }
 916
 917 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 918 {
 919         if (res->sr_slot != NULL) {
 920                 if (res->sr_slot->table->session != NULL)
 921                         nfs41_sequence_free_slot(res);
 922                 else
 923                         nfs40_sequence_free_slot(res);
 924         }
 925 }
 926
 927 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 928 {
 929         if (res->sr_slot == NULL)
 930                 return 1;
 931         if (!res->sr_slot->table->session)
 932                 return nfs40_sequence_done(task, res);
 933         return nfs41_sequence_done(task, res);
 934 }
 935 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 936
 937 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 938 {
 939         struct nfs4_call_sync_data *data = calldata;
 940
 941         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 942
 943         nfs4_setup_sequence(data->seq_server->nfs_client,
 944                             data->seq_args, data->seq_res, task);
 945 }
 946
 947 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 948 {
 949         struct nfs4_call_sync_data *data = calldata;
 950
 951         nfs41_sequence_done(task, data->seq_res);
 952 }
 953
 954 static const struct rpc_call_ops nfs41_call_sync_ops = {
 955         .rpc_call_prepare = nfs41_call_sync_prepare,
 956         .rpc_call_done = nfs41_call_sync_done,
 957 };
 958
 959 #else   /* !CONFIG_NFS_V4_1 */
 960
 961 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 962 {
 963         return nfs40_sequence_done(task, res);
 964 }
 965
 966 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 967 {
 968         if (res->sr_slot != NULL)
 969                 nfs40_sequence_free_slot(res);
 970 }
 971
 972 int nfs4_sequence_done(struct rpc_task *task,
 973                        struct nfs4_sequence_res *res)
 974 {
 975         return nfs40_sequence_done(task, res);
 976 }
 977 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 978
 979 #endif  /* !CONFIG_NFS_V4_1 */
 980
 981 static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
 982 {
 983         res->sr_timestamp = jiffies;
 984         res->sr_status_flags = 0;
 985         res->sr_status = 1;
 986 }
 987
 988 static
 989 void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
 990                 struct nfs4_sequence_res *res,
 991                 struct nfs4_slot *slot)
 992 {
 993         if (!slot)
 994                 return;
 995         slot->privileged = args->sa_privileged ? 1 : 0;
 996         args->sa_slot = slot;
 997
 998         res->sr_slot = slot;
 999 }
1000
1001 int nfs4_setup_sequence(struct nfs_client *client,
1002                         struct nfs4_sequence_args *args,
1003                         struct nfs4_sequence_res *res,
1004                         struct rpc_task *task)
1005 {
1006         struct nfs4_session *session = nfs4_get_session(client);
1007         struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
1008         struct nfs4_slot *slot;
1009
1010         /* slot already allocated? */
1011         if (res->sr_slot != NULL)
1012                 goto out_start;
1013
1014         if (session)
1015                 tbl = &session->fc_slot_table;
1016
1017         spin_lock(&tbl->slot_tbl_lock);
1018         /* The state manager will wait until the slot table is empty */
1019         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
1020                 goto out_sleep;
1021
1022         slot = nfs4_alloc_slot(tbl);
1023         if (IS_ERR(slot)) {
1024                 if (slot == ERR_PTR(-ENOMEM))
1025                         goto out_sleep_timeout;
1026                 goto out_sleep;
1027         }
1028         spin_unlock(&tbl->slot_tbl_lock);
1029
1030         nfs4_sequence_attach_slot(args, res, slot);
1031
1032         trace_nfs4_setup_sequence(session, args);
1033 out_start:
1034         nfs41_sequence_res_init(res);
1035         rpc_call_start(task);
1036         return 0;
1037 out_sleep_timeout:
1038         /* Try again in 1/4 second */
1039         if (args->sa_privileged)
1040                 rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
1041                                 jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
1042         else
1043                 rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
1044                                 NULL, jiffies + (HZ >> 2));
1045         spin_unlock(&tbl->slot_tbl_lock);
1046         return -EAGAIN;
1047 out_sleep:
1048         if (args->sa_privileged)
1049                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
1050                                 RPC_PRIORITY_PRIVILEGED);
1051         else
1052                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
1053         spin_unlock(&tbl->slot_tbl_lock);
1054         return -EAGAIN;
1055 }
1056 EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
1057
1058 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
1059 {
1060         struct nfs4_call_sync_data *data = calldata;
1061         nfs4_setup_sequence(data->seq_server->nfs_client,
1062                                 data->seq_args, data->seq_res, task);
1063 }
1064
1065 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
1066 {
1067         struct nfs4_call_sync_data *data = calldata;
1068         nfs4_sequence_done(task, data->seq_res);
1069 }
1070
1071 static const struct rpc_call_ops nfs40_call_sync_ops = {
1072         .rpc_call_prepare = nfs40_call_sync_prepare,
1073         .rpc_call_done = nfs40_call_sync_done,
1074 };
1075
1076 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1077                                    struct nfs_server *server,
1078                                    struct rpc_message *msg,
1079                                    struct nfs4_sequence_args *args,
1080                                    struct nfs4_sequence_res *res)
1081 {
1082         int ret;
1083         struct rpc_task *task;
1084         struct nfs_client *clp = server->nfs_client;
1085         struct nfs4_call_sync_data data = {
1086                 .seq_server = server,
1087                 .seq_args = args,
1088                 .seq_res = res,
1089         };
1090         struct rpc_task_setup task_setup = {
1091                 .rpc_client = clnt,
1092                 .rpc_message = msg,
1093                 .callback_ops = clp->cl_mvops->call_sync_ops,
1094                 .callback_data = &data
1095         };
1096
1097         task = rpc_run_task(&task_setup);
1098         if (IS_ERR(task))
1099                 ret = PTR_ERR(task);
1100         else {
1101                 ret = task->tk_status;
1102                 rpc_put_task(task);
1103         }
1104         return ret;
1105 }
1106
1107 int nfs4_call_sync(struct rpc_clnt *clnt,
1108                    struct nfs_server *server,
1109                    struct rpc_message *msg,
1110                    struct nfs4_sequence_args *args,
1111                    struct nfs4_sequence_res *res,
1112                    int cache_reply)
1113 {
1114         nfs4_init_sequence(args, res, cache_reply, 0);
1115         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1116 }
1117
1118 static void
1119 nfs4_inc_nlink_locked(struct inode *inode)
1120 {
1121         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER;
1122         inc_nlink(inode);
1123 }
1124
1125 static void
1126 nfs4_dec_nlink_locked(struct inode *inode)
1127 {
1128         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_OTHER;
1129         drop_nlink(inode);
1130 }
1131
1132 static void
1133 update_changeattr_locked(struct inode *dir, struct nfs4_change_info *cinfo,
1134                 unsigned long timestamp, unsigned long cache_validity)
1135 {
1136         struct nfs_inode *nfsi = NFS_I(dir);
1137
1138         nfsi->cache_validity |= NFS_INO_INVALID_CTIME
1139                 | NFS_INO_INVALID_MTIME
1140                 | NFS_INO_INVALID_DATA
1141                 | cache_validity;
1142         if (cinfo->atomic && cinfo->before == inode_peek_iversion_raw(dir)) {
1143                 nfsi->cache_validity &= ~NFS_INO_REVAL_PAGECACHE;
1144                 nfsi->attrtimeo_timestamp = jiffies;
1145         } else {
1146                 nfs_force_lookup_revalidate(dir);
1147                 if (cinfo->before != inode_peek_iversion_raw(dir))
1148                         nfsi->cache_validity |= NFS_INO_INVALID_ACCESS |
1149                                 NFS_INO_INVALID_ACL;
1150         }
1151         inode_set_iversion_raw(dir, cinfo->after);
1152         nfsi->read_cache_jiffies = timestamp;
1153         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1154         nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
1155         nfs_fscache_invalidate(dir);
1156 }
1157
1158 static void
1159 update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
1160                 unsigned long timestamp, unsigned long cache_validity)
1161 {
1162         spin_lock(&dir->i_lock);
1163         update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
1164         spin_unlock(&dir->i_lock);
1165 }
1166
1167 struct nfs4_open_createattrs {
1168         struct nfs4_label *label;
1169         struct iattr *sattr;
1170         const __u32 verf[2];
1171 };
1172
1173 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1174                 int err, struct nfs4_exception *exception)
1175 {
1176         if (err != -EINVAL)
1177                 return false;
1178         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1179                 return false;
1180         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1181         exception->retry = 1;
1182         return true;
1183 }
1184
1185 static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
1186 {
1187          return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
1188 }
1189
1190 static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
1191 {
1192         fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
1193
1194         return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
1195 }
1196
1197 static u32
1198 nfs4_map_atomic_open_share(struct nfs_server *server,
1199                 fmode_t fmode, int openflags)
1200 {
1201         u32 res = 0;
1202
1203         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1204         case FMODE_READ:
1205                 res = NFS4_SHARE_ACCESS_READ;
1206                 break;
1207         case FMODE_WRITE:
1208                 res = NFS4_SHARE_ACCESS_WRITE;
1209                 break;
1210         case FMODE_READ|FMODE_WRITE:
1211                 res = NFS4_SHARE_ACCESS_BOTH;
1212         }
1213         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1214                 goto out;
1215         /* Want no delegation if we're using O_DIRECT */
1216         if (openflags & O_DIRECT)
1217                 res |= NFS4_SHARE_WANT_NO_DELEG;
1218 out:
1219         return res;
1220 }
1221
1222 static enum open_claim_type4
1223 nfs4_map_atomic_open_claim(struct nfs_server *server,
1224                 enum open_claim_type4 claim)
1225 {
1226         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1227                 return claim;
1228         switch (claim) {
1229         default:
1230                 return claim;
1231         case NFS4_OPEN_CLAIM_FH:
1232                 return NFS4_OPEN_CLAIM_NULL;
1233         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1234                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1235         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1236                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1237         }
1238 }
1239
1240 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1241 {
1242         p->o_res.f_attr = &p->f_attr;
1243         p->o_res.f_label = p->f_label;
1244         p->o_res.seqid = p->o_arg.seqid;
1245         p->c_res.seqid = p->c_arg.seqid;
1246         p->o_res.server = p->o_arg.server;
1247         p->o_res.access_request = p->o_arg.access;
1248         nfs_fattr_init(&p->f_attr);
1249         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1250 }
1251
1252 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1253                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1254                 const struct nfs4_open_createattrs *c,
1255                 enum open_claim_type4 claim,
1256                 gfp_t gfp_mask)
1257 {
1258         struct dentry *parent = dget_parent(dentry);
1259         struct inode *dir = d_inode(parent);
1260         struct nfs_server *server = NFS_SERVER(dir);
1261         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1262         struct nfs4_label *label = (c != NULL) ? c->label : NULL;
1263         struct nfs4_opendata *p;
1264
1265         p = kzalloc(sizeof(*p), gfp_mask);
1266         if (p == NULL)
1267                 goto err;
1268
1269         p->f_label = nfs4_label_alloc(server, gfp_mask);
1270         if (IS_ERR(p->f_label))
1271                 goto err_free_p;
1272
1273         p->a_label = nfs4_label_alloc(server, gfp_mask);
1274         if (IS_ERR(p->a_label))
1275                 goto err_free_f;
1276
1277         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1278         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1279         if (IS_ERR(p->o_arg.seqid))
1280                 goto err_free_label;
1281         nfs_sb_active(dentry->d_sb);
1282         p->dentry = dget(dentry);
1283         p->dir = parent;
1284         p->owner = sp;
1285         atomic_inc(&sp->so_count);
1286         p->o_arg.open_flags = flags;
1287         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1288         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1289         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1290                         fmode, flags);
1291         if (flags & O_CREAT) {
1292                 p->o_arg.umask = current_umask();
1293                 p->o_arg.label = nfs4_label_copy(p->a_label, label);
1294                 if (c->sattr != NULL && c->sattr->ia_valid != 0) {
1295                         p->o_arg.u.attrs = &p->attrs;
1296                         memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
1297
1298                         memcpy(p->o_arg.u.verifier.data, c->verf,
1299                                         sizeof(p->o_arg.u.verifier.data));
1300                 }
1301         }
1302         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1303          * will return permission denied for all bits until close */
1304         if (!(flags & O_EXCL)) {
1305                 /* ask server to check for all possible rights as results
1306                  * are cached */
1307                 switch (p->o_arg.claim) {
1308                 default:
1309                         break;
1310                 case NFS4_OPEN_CLAIM_NULL:
1311                 case NFS4_OPEN_CLAIM_FH:
1312                         p->o_arg.access = NFS4_ACCESS_READ |
1313                                 NFS4_ACCESS_MODIFY |
1314                                 NFS4_ACCESS_EXTEND |
1315                                 NFS4_ACCESS_EXECUTE;
1316                 }
1317         }
1318         p->o_arg.clientid = server->nfs_client->cl_clientid;
1319         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1320         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1321         p->o_arg.name = &dentry->d_name;
1322         p->o_arg.server = server;
1323         p->o_arg.bitmask = nfs4_bitmask(server, label);
1324         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1325         switch (p->o_arg.claim) {
1326         case NFS4_OPEN_CLAIM_NULL:
1327         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1328         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1329                 p->o_arg.fh = NFS_FH(dir);
1330                 break;
1331         case NFS4_OPEN_CLAIM_PREVIOUS:
1332         case NFS4_OPEN_CLAIM_FH:
1333         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1334         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1335                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1336         }
1337         p->c_arg.fh = &p->o_res.fh;
1338         p->c_arg.stateid = &p->o_res.stateid;
1339         p->c_arg.seqid = p->o_arg.seqid;
1340         nfs4_init_opendata_res(p);
1341         kref_init(&p->kref);
1342         return p;
1343
1344 err_free_label:
1345         nfs4_label_free(p->a_label);
1346 err_free_f:
1347         nfs4_label_free(p->f_label);
1348 err_free_p:
1349         kfree(p);
1350 err:
1351         dput(parent);
1352         return NULL;
1353 }
1354
1355 static void nfs4_opendata_free(struct kref *kref)
1356 {
1357         struct nfs4_opendata *p = container_of(kref,
1358                         struct nfs4_opendata, kref);
1359         struct super_block *sb = p->dentry->d_sb;
1360
1361         nfs4_lgopen_release(p->lgp);
1362         nfs_free_seqid(p->o_arg.seqid);
1363         nfs4_sequence_free_slot(&p->o_res.seq_res);
1364         if (p->state != NULL)
1365                 nfs4_put_open_state(p->state);
1366         nfs4_put_state_owner(p->owner);
1367
1368         nfs4_label_free(p->a_label);
1369         nfs4_label_free(p->f_label);
1370
1371         dput(p->dir);
1372         dput(p->dentry);
1373         nfs_sb_deactive(sb);
1374         nfs_fattr_free_names(&p->f_attr);
1375         kfree(p->f_attr.mdsthreshold);
1376         kfree(p);
1377 }
1378
1379 static void nfs4_opendata_put(struct nfs4_opendata *p)
1380 {
1381         if (p != NULL)
1382                 kref_put(&p->kref, nfs4_opendata_free);
1383 }
1384
1385 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1386                 fmode_t fmode)
1387 {
1388         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1389         case FMODE_READ|FMODE_WRITE:
1390                 return state->n_rdwr != 0;
1391         case FMODE_WRITE:
1392                 return state->n_wronly != 0;
1393         case FMODE_READ:
1394                 return state->n_rdonly != 0;
1395         }
1396         WARN_ON_ONCE(1);
1397         return false;
1398 }
1399
1400 static int can_open_cached(struct nfs4_state *state, fmode_t mode,
1401                 int open_mode, enum open_claim_type4 claim)
1402 {
1403         int ret = 0;
1404
1405         if (open_mode & (O_EXCL|O_TRUNC))
1406                 goto out;
1407         switch (claim) {
1408         case NFS4_OPEN_CLAIM_NULL:
1409         case NFS4_OPEN_CLAIM_FH:
1410                 goto out;
1411         default:
1412                 break;
1413         }
1414         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1415                 case FMODE_READ:
1416                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1417                                 && state->n_rdonly != 0;
1418                         break;
1419                 case FMODE_WRITE:
1420                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1421                                 && state->n_wronly != 0;
1422                         break;
1423                 case FMODE_READ|FMODE_WRITE:
1424                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1425                                 && state->n_rdwr != 0;
1426         }
1427 out:
1428         return ret;
1429 }
1430
1431 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1432                 enum open_claim_type4 claim)
1433 {
1434         if (delegation == NULL)
1435                 return 0;
1436         if ((delegation->type & fmode) != fmode)
1437                 return 0;
1438         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1439                 return 0;
1440         switch (claim) {
1441         case NFS4_OPEN_CLAIM_NULL:
1442         case NFS4_OPEN_CLAIM_FH:
1443                 break;
1444         case NFS4_OPEN_CLAIM_PREVIOUS:
1445                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1446                         break;
1447                 /* Fall through */
1448         default:
1449                 return 0;
1450         }
1451         nfs_mark_delegation_referenced(delegation);
1452         return 1;
1453 }
1454
1455 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1456 {
1457         switch (fmode) {
1458                 case FMODE_WRITE:
1459                         state->n_wronly++;
1460                         break;
1461                 case FMODE_READ:
1462                         state->n_rdonly++;
1463                         break;
1464                 case FMODE_READ|FMODE_WRITE:
1465                         state->n_rdwr++;
1466         }
1467         nfs4_state_set_mode_locked(state, state->state | fmode);
1468 }
1469
1470 #ifdef CONFIG_NFS_V4_1
1471 static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
1472 {
1473         if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
1474                 return true;
1475         if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
1476                 return true;
1477         if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
1478                 return true;
1479         return false;
1480 }
1481 #endif /* CONFIG_NFS_V4_1 */
1482
1483 static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
1484 {
1485         if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1486                 wake_up_all(&state->waitq);
1487 }
1488
1489 static void nfs_state_log_out_of_order_open_stateid(struct nfs4_state *state,
1490                 const nfs4_stateid *stateid)
1491 {
1492         u32 state_seqid = be32_to_cpu(state->open_stateid.seqid);
1493         u32 stateid_seqid = be32_to_cpu(stateid->seqid);
1494
1495         if (stateid_seqid == state_seqid + 1U ||
1496             (stateid_seqid == 1U && state_seqid == 0xffffffffU))
1497                 nfs_state_log_update_open_stateid(state);
1498         else
1499                 set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1500 }
1501
1502 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1503 {
1504         struct nfs_client *clp = state->owner->so_server->nfs_client;
1505         bool need_recover = false;
1506
1507         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1508                 need_recover = true;
1509         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1510                 need_recover = true;
1511         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1512                 need_recover = true;
1513         if (need_recover)
1514                 nfs4_state_mark_reclaim_nograce(clp, state);
1515 }
1516
1517 /*
1518  * Check for whether or not the caller may update the open stateid
1519  * to the value passed in by stateid.
1520  *
1521  * Note: This function relies heavily on the server implementing
1522  * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
1523  * correctly.
1524  * i.e. The stateid seqids have to be initialised to 1, and
1525  * are then incremented on every state transition.
1526  */
1527 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1528                 const nfs4_stateid *stateid)
1529 {
1530         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0 ||
1531             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1532                 if (stateid->seqid == cpu_to_be32(1))
1533                         nfs_state_log_update_open_stateid(state);
1534                 else
1535                         set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
1536                 return true;
1537         }
1538
1539         if (nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1540                 nfs_state_log_out_of_order_open_stateid(state, stateid);
1541                 return true;
1542         }
1543         return false;
1544 }
1545
1546 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1547 {
1548         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1549                 return;
1550         if (state->n_wronly)
1551                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1552         if (state->n_rdonly)
1553                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1554         if (state->n_rdwr)
1555                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1556         set_bit(NFS_OPEN_STATE, &state->flags);
1557 }
1558
1559 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1560                 nfs4_stateid *stateid, fmode_t fmode)
1561 {
1562         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1563         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1564         case FMODE_WRITE:
1565                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1566                 break;
1567         case FMODE_READ:
1568                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1569                 break;
1570         case 0:
1571                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1572                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1573                 clear_bit(NFS_OPEN_STATE, &state->flags);
1574         }
1575         if (stateid == NULL)
1576                 return;
1577         /* Handle OPEN+OPEN_DOWNGRADE races */
1578         if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1579             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1580                 nfs_resync_open_stateid_locked(state);
1581                 goto out;
1582         }
1583         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1584                 nfs4_stateid_copy(&state->stateid, stateid);
1585         nfs4_stateid_copy(&state->open_stateid, stateid);
1586         trace_nfs4_open_stateid_update(state->inode, stateid, 0);
1587 out:
1588         nfs_state_log_update_open_stateid(state);
1589 }
1590
1591 static void nfs_clear_open_stateid(struct nfs4_state *state,
1592         nfs4_stateid *arg_stateid,
1593         nfs4_stateid *stateid, fmode_t fmode)
1594 {
1595         write_seqlock(&state->seqlock);
1596         /* Ignore, if the CLOSE argment doesn't match the current stateid */
1597         if (nfs4_state_match_open_stateid_other(state, arg_stateid))
1598                 nfs_clear_open_stateid_locked(state, stateid, fmode);
1599         write_sequnlock(&state->seqlock);
1600         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1601                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1602 }
1603
1604 static void nfs_set_open_stateid_locked(struct nfs4_state *state,
1605                 const nfs4_stateid *stateid, nfs4_stateid *freeme)
1606         __must_hold(&state->owner->so_lock)
1607         __must_hold(&state->seqlock)
1608         __must_hold(RCU)
1609
1610 {
1611         DEFINE_WAIT(wait);
1612         int status = 0;
1613         for (;;) {
1614
1615                 if (!nfs_need_update_open_stateid(state, stateid))
1616                         return;
1617                 if (!test_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
1618                         break;
1619                 if (status)
1620                         break;
1621                 /* Rely on seqids for serialisation with NFSv4.0 */
1622                 if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
1623                         break;
1624
1625                 prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
1626                 /*
1627                  * Ensure we process the state changes in the same order
1628                  * in which the server processed them by delaying the
1629                  * update of the stateid until we are in sequence.
1630                  */
1631                 write_sequnlock(&state->seqlock);
1632                 spin_unlock(&state->owner->so_lock);
1633                 rcu_read_unlock();
1634                 trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
1635                 if (!signal_pending(current)) {
1636                         if (schedule_timeout(5*HZ) == 0)
1637                                 status = -EAGAIN;
1638                         else
1639                                 status = 0;
1640                 } else
1641                         status = -EINTR;
1642                 finish_wait(&state->waitq, &wait);
1643                 rcu_read_lock();
1644                 spin_lock(&state->owner->so_lock);
1645                 write_seqlock(&state->seqlock);
1646         }
1647
1648         if (test_bit(NFS_OPEN_STATE, &state->flags) &&
1649             !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1650                 nfs4_stateid_copy(freeme, &state->open_stateid);
1651                 nfs_test_and_clear_all_open_stateid(state);
1652         }
1653
1654         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1655                 nfs4_stateid_copy(&state->stateid, stateid);
1656         nfs4_stateid_copy(&state->open_stateid, stateid);
1657         trace_nfs4_open_stateid_update(state->inode, stateid, status);
1658         nfs_state_log_update_open_stateid(state);
1659 }
1660
1661 static void nfs_state_set_open_stateid(struct nfs4_state *state,
1662                 const nfs4_stateid *open_stateid,
1663                 fmode_t fmode,
1664                 nfs4_stateid *freeme)
1665 {
1666         /*
1667          * Protect the call to nfs4_state_set_mode_locked and
1668          * serialise the stateid update
1669          */
1670         write_seqlock(&state->seqlock);
1671         nfs_set_open_stateid_locked(state, open_stateid, freeme);
1672         switch (fmode) {
1673         case FMODE_READ:
1674                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1675                 break;
1676         case FMODE_WRITE:
1677                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1678                 break;
1679         case FMODE_READ|FMODE_WRITE:
1680                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1681         }
1682         set_bit(NFS_OPEN_STATE, &state->flags);
1683         write_sequnlock(&state->seqlock);
1684 }
1685
1686 static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
1687 {
1688         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1689         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1690         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1691         clear_bit(NFS_OPEN_STATE, &state->flags);
1692 }
1693
1694 static void nfs_state_set_delegation(struct nfs4_state *state,
1695                 const nfs4_stateid *deleg_stateid,
1696                 fmode_t fmode)
1697 {
1698         /*
1699          * Protect the call to nfs4_state_set_mode_locked and
1700          * serialise the stateid update
1701          */
1702         write_seqlock(&state->seqlock);
1703         nfs4_stateid_copy(&state->stateid, deleg_stateid);
1704         set_bit(NFS_DELEGATED_STATE, &state->flags);
1705         write_sequnlock(&state->seqlock);
1706 }
1707
1708 static void nfs_state_clear_delegation(struct nfs4_state *state)
1709 {
1710         write_seqlock(&state->seqlock);
1711         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1712         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1713         write_sequnlock(&state->seqlock);
1714 }
1715
1716 static int update_open_stateid(struct nfs4_state *state,
1717                 const nfs4_stateid *open_stateid,
1718                 const nfs4_stateid *delegation,
1719                 fmode_t fmode)
1720 {
1721         struct nfs_server *server = NFS_SERVER(state->inode);
1722         struct nfs_client *clp = server->nfs_client;
1723         struct nfs_inode *nfsi = NFS_I(state->inode);
1724         struct nfs_delegation *deleg_cur;
1725         nfs4_stateid freeme = { };
1726         int ret = 0;
1727
1728         fmode &= (FMODE_READ|FMODE_WRITE);
1729
1730         rcu_read_lock();
1731         spin_lock(&state->owner->so_lock);
1732         if (open_stateid != NULL) {
1733                 nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
1734                 ret = 1;
1735         }
1736
1737         deleg_cur = rcu_dereference(nfsi->delegation);
1738         if (deleg_cur == NULL)
1739                 goto no_delegation;
1740
1741         spin_lock(&deleg_cur->lock);
1742         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1743            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1744             (deleg_cur->type & fmode) != fmode)
1745                 goto no_delegation_unlock;
1746
1747         if (delegation == NULL)
1748                 delegation = &deleg_cur->stateid;
1749         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1750                 goto no_delegation_unlock;
1751
1752         nfs_mark_delegation_referenced(deleg_cur);
1753         nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
1754         ret = 1;
1755 no_delegation_unlock:
1756         spin_unlock(&deleg_cur->lock);
1757 no_delegation:
1758         if (ret)
1759                 update_open_stateflags(state, fmode);
1760         spin_unlock(&state->owner->so_lock);
1761         rcu_read_unlock();
1762
1763         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1764                 nfs4_schedule_state_manager(clp);
1765         if (freeme.type != 0)
1766                 nfs4_test_and_free_stateid(server, &freeme,
1767                                 state->owner->so_cred);
1768
1769         return ret;
1770 }
1771
1772 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1773                 const nfs4_stateid *stateid)
1774 {
1775         struct nfs4_state *state = lsp->ls_state;
1776         bool ret = false;
1777
1778         spin_lock(&state->state_lock);
1779         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1780                 goto out_noupdate;
1781         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1782                 goto out_noupdate;
1783         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1784         ret = true;
1785 out_noupdate:
1786         spin_unlock(&state->state_lock);
1787         return ret;
1788 }
1789
1790 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1791 {
1792         struct nfs_delegation *delegation;
1793
1794         fmode &= FMODE_READ|FMODE_WRITE;
1795         rcu_read_lock();
1796         delegation = rcu_dereference(NFS_I(inode)->delegation);
1797         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1798                 rcu_read_unlock();
1799                 return;
1800         }
1801         rcu_read_unlock();
1802         nfs4_inode_return_delegation(inode);
1803 }
1804
1805 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1806 {
1807         struct nfs4_state *state = opendata->state;
1808         struct nfs_inode *nfsi = NFS_I(state->inode);
1809         struct nfs_delegation *delegation;
1810         int open_mode = opendata->o_arg.open_flags;
1811         fmode_t fmode = opendata->o_arg.fmode;
1812         enum open_claim_type4 claim = opendata->o_arg.claim;
1813         nfs4_stateid stateid;
1814         int ret = -EAGAIN;
1815
1816         for (;;) {
1817                 spin_lock(&state->owner->so_lock);
1818                 if (can_open_cached(state, fmode, open_mode, claim)) {
1819                         update_open_stateflags(state, fmode);
1820                         spin_unlock(&state->owner->so_lock);
1821                         goto out_return_state;
1822                 }
1823                 spin_unlock(&state->owner->so_lock);
1824                 rcu_read_lock();
1825                 delegation = rcu_dereference(nfsi->delegation);
1826                 if (!can_open_delegated(delegation, fmode, claim)) {
1827                         rcu_read_unlock();
1828                         break;
1829                 }
1830                 /* Save the delegation */
1831                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1832                 rcu_read_unlock();
1833                 nfs_release_seqid(opendata->o_arg.seqid);
1834                 if (!opendata->is_recover) {
1835                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1836                         if (ret != 0)
1837                                 goto out;
1838                 }
1839                 ret = -EAGAIN;
1840
1841                 /* Try to update the stateid using the delegation */
1842                 if (update_open_stateid(state, NULL, &stateid, fmode))
1843                         goto out_return_state;
1844         }
1845 out:
1846         return ERR_PTR(ret);
1847 out_return_state:
1848         refcount_inc(&state->count);
1849         return state;
1850 }
1851
1852 static void
1853 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1854 {
1855         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1856         struct nfs_delegation *delegation;
1857         int delegation_flags = 0;
1858
1859         rcu_read_lock();
1860         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1861         if (delegation)
1862                 delegation_flags = delegation->flags;
1863         rcu_read_unlock();
1864         switch (data->o_arg.claim) {
1865         default:
1866                 break;
1867         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1868         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1869                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1870                                    "returning a delegation for "
1871                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1872                                    clp->cl_hostname);
1873                 return;
1874         }
1875         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1876                 nfs_inode_set_delegation(state->inode,
1877                                 data->owner->so_cred,
1878                                 data->o_res.delegation_type,
1879                                 &data->o_res.delegation,
1880                                 data->o_res.pagemod_limit);
1881         else
1882                 nfs_inode_reclaim_delegation(state->inode,
1883                                 data->owner->so_cred,
1884                                 data->o_res.delegation_type,
1885                                 &data->o_res.delegation,
1886                                 data->o_res.pagemod_limit);
1887
1888         if (data->o_res.do_recall)
1889                 nfs_async_inode_return_delegation(state->inode,
1890                                                   &data->o_res.delegation);
1891 }
1892
1893 /*
1894  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1895  * and update the nfs4_state.
1896  */
1897 static struct nfs4_state *
1898 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1899 {
1900         struct inode *inode = data->state->inode;
1901         struct nfs4_state *state = data->state;
1902         int ret;
1903
1904         if (!data->rpc_done) {
1905                 if (data->rpc_status)
1906                         return ERR_PTR(data->rpc_status);
1907                 /* cached opens have already been processed */
1908                 goto update;
1909         }
1910
1911         ret = nfs_refresh_inode(inode, &data->f_attr);
1912         if (ret)
1913                 return ERR_PTR(ret);
1914
1915         if (data->o_res.delegation_type != 0)
1916                 nfs4_opendata_check_deleg(data, state);
1917 update:
1918         if (!update_open_stateid(state, &data->o_res.stateid,
1919                                 NULL, data->o_arg.fmode))
1920                 return ERR_PTR(-EAGAIN);
1921         refcount_inc(&state->count);
1922
1923         return state;
1924 }
1925
1926 static struct inode *
1927 nfs4_opendata_get_inode(struct nfs4_opendata *data)
1928 {
1929         struct inode *inode;
1930
1931         switch (data->o_arg.claim) {
1932         case NFS4_OPEN_CLAIM_NULL:
1933         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1934         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1935                 if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1936                         return ERR_PTR(-EAGAIN);
1937                 inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
1938                                 &data->f_attr, data->f_label);
1939                 break;
1940         default:
1941                 inode = d_inode(data->dentry);
1942                 ihold(inode);
1943                 nfs_refresh_inode(inode, &data->f_attr);
1944         }
1945         return inode;
1946 }
1947
1948 static struct nfs4_state *
1949 nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
1950 {
1951         struct nfs4_state *state;
1952         struct inode *inode;
1953
1954         inode = nfs4_opendata_get_inode(data);
1955         if (IS_ERR(inode))
1956                 return ERR_CAST(inode);
1957         if (data->state != NULL && data->state->inode == inode) {
1958                 state = data->state;
1959                 refcount_inc(&state->count);
1960         } else
1961                 state = nfs4_get_open_state(inode, data->owner);
1962         iput(inode);
1963         if (state == NULL)
1964                 state = ERR_PTR(-ENOMEM);
1965         return state;
1966 }
1967
1968 static struct nfs4_state *
1969 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1970 {
1971         struct nfs4_state *state;
1972
1973         if (!data->rpc_done) {
1974                 state = nfs4_try_open_cached(data);
1975                 trace_nfs4_cached_open(data->state);
1976                 goto out;
1977         }
1978
1979         state = nfs4_opendata_find_nfs4_state(data);
1980         if (IS_ERR(state))
1981                 goto out;
1982
1983         if (data->o_res.delegation_type != 0)
1984                 nfs4_opendata_check_deleg(data, state);
1985         if (!update_open_stateid(state, &data->o_res.stateid,
1986                                 NULL, data->o_arg.fmode)) {
1987                 nfs4_put_open_state(state);
1988                 state = ERR_PTR(-EAGAIN);
1989         }
1990 out:
1991         nfs_release_seqid(data->o_arg.seqid);
1992         return state;
1993 }
1994
1995 static struct nfs4_state *
1996 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1997 {
1998         struct nfs4_state *ret;
1999
2000         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
2001                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
2002         else
2003                 ret = _nfs4_opendata_to_nfs4_state(data);
2004         nfs4_sequence_free_slot(&data->o_res.seq_res);
2005         return ret;
2006 }
2007
2008 static struct nfs_open_context *
2009 nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
2010 {
2011         struct nfs_inode *nfsi = NFS_I(state->inode);
2012         struct nfs_open_context *ctx;
2013
2014         rcu_read_lock();
2015         list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
2016                 if (ctx->state != state)
2017                         continue;
2018                 if ((ctx->mode & mode) != mode)
2019                         continue;
2020                 if (!get_nfs_open_context(ctx))
2021                         continue;
2022                 rcu_read_unlock();
2023                 return ctx;
2024         }
2025         rcu_read_unlock();
2026         return ERR_PTR(-ENOENT);
2027 }
2028
2029 static struct nfs_open_context *
2030 nfs4_state_find_open_context(struct nfs4_state *state)
2031 {
2032         struct nfs_open_context *ctx;
2033
2034         ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
2035         if (!IS_ERR(ctx))
2036                 return ctx;
2037         ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
2038         if (!IS_ERR(ctx))
2039                 return ctx;
2040         return nfs4_state_find_open_context_mode(state, FMODE_READ);
2041 }
2042
2043 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
2044                 struct nfs4_state *state, enum open_claim_type4 claim)
2045 {
2046         struct nfs4_opendata *opendata;
2047
2048         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
2049                         NULL, claim, GFP_NOFS);
2050         if (opendata == NULL)
2051                 return ERR_PTR(-ENOMEM);
2052         opendata->state = state;
2053         refcount_inc(&state->count);
2054         return opendata;
2055 }
2056
2057 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
2058                 fmode_t fmode)
2059 {
2060         struct nfs4_state *newstate;
2061         int ret;
2062
2063         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
2064                 return 0;
2065         opendata->o_arg.open_flags = 0;
2066         opendata->o_arg.fmode = fmode;
2067         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
2068                         NFS_SB(opendata->dentry->d_sb),
2069                         fmode, 0);
2070         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
2071         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
2072         nfs4_init_opendata_res(opendata);
2073         ret = _nfs4_recover_proc_open(opendata);
2074         if (ret != 0)
2075                 return ret;
2076         newstate = nfs4_opendata_to_nfs4_state(opendata);
2077         if (IS_ERR(newstate))
2078                 return PTR_ERR(newstate);
2079         if (newstate != opendata->state)
2080                 ret = -ESTALE;
2081         nfs4_close_state(newstate, fmode);
2082         return ret;
2083 }
2084
2085 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
2086 {
2087         int ret;
2088
2089         /* memory barrier prior to reading state->n_* */
2090         smp_rmb();
2091         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2092         if (ret != 0)
2093                 return ret;
2094         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2095         if (ret != 0)
2096                 return ret;
2097         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
2098         if (ret != 0)
2099                 return ret;
2100         /*
2101          * We may have performed cached opens for all three recoveries.
2102          * Check if we need to update the current stateid.
2103          */
2104         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
2105             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
2106                 write_seqlock(&state->seqlock);
2107                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
2108                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2109                 write_sequnlock(&state->seqlock);
2110         }
2111         return 0;
2112 }
2113
2114 /*
2115  * OPEN_RECLAIM:
2116  *      reclaim state on the server after a reboot.
2117  */
2118 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2119 {
2120         struct nfs_delegation *delegation;
2121         struct nfs4_opendata *opendata;
2122         fmode_t delegation_type = 0;
2123         int status;
2124
2125         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2126                         NFS4_OPEN_CLAIM_PREVIOUS);
2127         if (IS_ERR(opendata))
2128                 return PTR_ERR(opendata);
2129         rcu_read_lock();
2130         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2131         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
2132                 delegation_type = delegation->type;
2133         rcu_read_unlock();
2134         opendata->o_arg.u.delegation_type = delegation_type;
2135         status = nfs4_open_recover(opendata, state);
2136         nfs4_opendata_put(opendata);
2137         return status;
2138 }
2139
2140 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
2141 {
2142         struct nfs_server *server = NFS_SERVER(state->inode);
2143         struct nfs4_exception exception = { };
2144         int err;
2145         do {
2146                 err = _nfs4_do_open_reclaim(ctx, state);
2147                 trace_nfs4_open_reclaim(ctx, 0, err);
2148                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2149                         continue;
2150                 if (err != -NFS4ERR_DELAY)
2151                         break;
2152                 nfs4_handle_exception(server, err, &exception);
2153         } while (exception.retry);
2154         return err;
2155 }
2156
2157 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
2158 {
2159         struct nfs_open_context *ctx;
2160         int ret;
2161
2162         ctx = nfs4_state_find_open_context(state);
2163         if (IS_ERR(ctx))
2164                 return -EAGAIN;
2165         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2166         nfs_state_clear_open_state_flags(state);
2167         ret = nfs4_do_open_reclaim(ctx, state);
2168         put_nfs_open_context(ctx);
2169         return ret;
2170 }
2171
2172 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
2173 {
2174         switch (err) {
2175                 default:
2176                         printk(KERN_ERR "NFS: %s: unhandled error "
2177                                         "%d.\n", __func__, err);
2178                 case 0:
2179                 case -ENOENT:
2180                 case -EAGAIN:
2181                 case -ESTALE:
2182                 case -ETIMEDOUT:
2183                         break;
2184                 case -NFS4ERR_BADSESSION:
2185                 case -NFS4ERR_BADSLOT:
2186                 case -NFS4ERR_BAD_HIGH_SLOT:
2187                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
2188                 case -NFS4ERR_DEADSESSION:
2189                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
2190                         return -EAGAIN;
2191                 case -NFS4ERR_STALE_CLIENTID:
2192                 case -NFS4ERR_STALE_STATEID:
2193                         /* Don't recall a delegation if it was lost */
2194                         nfs4_schedule_lease_recovery(server->nfs_client);
2195                         return -EAGAIN;
2196                 case -NFS4ERR_MOVED:
2197                         nfs4_schedule_migration_recovery(server);
2198                         return -EAGAIN;
2199                 case -NFS4ERR_LEASE_MOVED:
2200                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
2201                         return -EAGAIN;
2202                 case -NFS4ERR_DELEG_REVOKED:
2203                 case -NFS4ERR_ADMIN_REVOKED:
2204                 case -NFS4ERR_EXPIRED:
2205                 case -NFS4ERR_BAD_STATEID:
2206                 case -NFS4ERR_OPENMODE:
2207                         nfs_inode_find_state_and_recover(state->inode,
2208                                         stateid);
2209                         nfs4_schedule_stateid_recovery(server, state);
2210                         return -EAGAIN;
2211                 case -NFS4ERR_DELAY:
2212                 case -NFS4ERR_GRACE:
2213                         ssleep(1);
2214                         return -EAGAIN;
2215                 case -ENOMEM:
2216                 case -NFS4ERR_DENIED:
2217                         if (fl) {
2218                                 struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
2219                                 if (lsp)
2220                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2221                         }
2222                         return 0;
2223         }
2224         return err;
2225 }
2226
2227 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
2228                 struct nfs4_state *state, const nfs4_stateid *stateid)
2229 {
2230         struct nfs_server *server = NFS_SERVER(state->inode);
2231         struct nfs4_opendata *opendata;
2232         int err = 0;
2233
2234         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2235                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
2236         if (IS_ERR(opendata))
2237                 return PTR_ERR(opendata);
2238         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
2239         if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
2240                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
2241                 if (err)
2242                         goto out;
2243         }
2244         if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
2245                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
2246                 if (err)
2247                         goto out;
2248         }
2249         if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
2250                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
2251                 if (err)
2252                         goto out;
2253         }
2254         nfs_state_clear_delegation(state);
2255 out:
2256         nfs4_opendata_put(opendata);
2257         return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
2258 }
2259
2260 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
2261 {
2262         struct nfs4_opendata *data = calldata;
2263
2264         nfs4_setup_sequence(data->o_arg.server->nfs_client,
2265                            &data->c_arg.seq_args, &data->c_res.seq_res, task);
2266 }
2267
2268 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
2269 {
2270         struct nfs4_opendata *data = calldata;
2271
2272         nfs40_sequence_done(task, &data->c_res.seq_res);
2273
2274         data->rpc_status = task->tk_status;
2275         if (data->rpc_status == 0) {
2276                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
2277                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
2278                 renew_lease(data->o_res.server, data->timestamp);
2279                 data->rpc_done = true;
2280         }
2281 }
2282
2283 static void nfs4_open_confirm_release(void *calldata)
2284 {
2285         struct nfs4_opendata *data = calldata;
2286         struct nfs4_state *state = NULL;
2287
2288         /* If this request hasn't been cancelled, do nothing */
2289         if (!data->cancelled)
2290                 goto out_free;
2291         /* In case of error, no cleanup! */
2292         if (!data->rpc_done)
2293                 goto out_free;
2294         state = nfs4_opendata_to_nfs4_state(data);
2295         if (!IS_ERR(state))
2296                 nfs4_close_state(state, data->o_arg.fmode);
2297 out_free:
2298         nfs4_opendata_put(data);
2299 }
2300
2301 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2302         .rpc_call_prepare = nfs4_open_confirm_prepare,
2303         .rpc_call_done = nfs4_open_confirm_done,
2304         .rpc_release = nfs4_open_confirm_release,
2305 };
2306
2307 /*
2308  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2309  */
2310 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2311 {
2312         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2313         struct rpc_task *task;
2314         struct  rpc_message msg = {
2315                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2316                 .rpc_argp = &data->c_arg,
2317                 .rpc_resp = &data->c_res,
2318                 .rpc_cred = data->owner->so_cred,
2319         };
2320         struct rpc_task_setup task_setup_data = {
2321                 .rpc_client = server->client,
2322                 .rpc_message = &msg,
2323                 .callback_ops = &nfs4_open_confirm_ops,
2324                 .callback_data = data,
2325                 .workqueue = nfsiod_workqueue,
2326                 .flags = RPC_TASK_ASYNC,
2327         };
2328         int status;
2329
2330         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
2331                                 data->is_recover);
2332         kref_get(&data->kref);
2333         data->rpc_done = false;
2334         data->rpc_status = 0;
2335         data->timestamp = jiffies;
2336         task = rpc_run_task(&task_setup_data);
2337         if (IS_ERR(task))
2338                 return PTR_ERR(task);
2339         status = rpc_wait_for_completion_task(task);
2340         if (status != 0) {
2341                 data->cancelled = true;
2342                 smp_wmb();
2343         } else
2344                 status = data->rpc_status;
2345         rpc_put_task(task);
2346         return status;
2347 }
2348
2349 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2350 {
2351         struct nfs4_opendata *data = calldata;
2352         struct nfs4_state_owner *sp = data->owner;
2353         struct nfs_client *clp = sp->so_server->nfs_client;
2354         enum open_claim_type4 claim = data->o_arg.claim;
2355
2356         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2357                 goto out_wait;
2358         /*
2359          * Check if we still need to send an OPEN call, or if we can use
2360          * a delegation instead.
2361          */
2362         if (data->state != NULL) {
2363                 struct nfs_delegation *delegation;
2364
2365                 if (can_open_cached(data->state, data->o_arg.fmode,
2366                                         data->o_arg.open_flags, claim))
2367                         goto out_no_action;
2368                 rcu_read_lock();
2369                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
2370                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2371                         goto unlock_no_action;
2372                 rcu_read_unlock();
2373         }
2374         /* Update client id. */
2375         data->o_arg.clientid = clp->cl_clientid;
2376         switch (claim) {
2377         default:
2378                 break;
2379         case NFS4_OPEN_CLAIM_PREVIOUS:
2380         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2381         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2382                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2383                 /* Fall through */
2384         case NFS4_OPEN_CLAIM_FH:
2385                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2386         }
2387         data->timestamp = jiffies;
2388         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
2389                                 &data->o_arg.seq_args,
2390                                 &data->o_res.seq_res,
2391                                 task) != 0)
2392                 nfs_release_seqid(data->o_arg.seqid);
2393
2394         /* Set the create mode (note dependency on the session type) */
2395         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2396         if (data->o_arg.open_flags & O_EXCL) {
2397                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2398                 if (nfs4_has_persistent_session(clp))
2399                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2400                 else if (clp->cl_mvops->minor_version > 0)
2401                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2402         }
2403         return;
2404 unlock_no_action:
2405         trace_nfs4_cached_open(data->state);
2406         rcu_read_unlock();
2407 out_no_action:
2408         task->tk_action = NULL;
2409 out_wait:
2410         nfs4_sequence_done(task, &data->o_res.seq_res);
2411 }
2412
2413 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2414 {
2415         struct nfs4_opendata *data = calldata;
2416
2417         data->rpc_status = task->tk_status;
2418
2419         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2420                 return;
2421
2422         if (task->tk_status == 0) {
2423                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2424                         switch (data->o_res.f_attr->mode & S_IFMT) {
2425                         case S_IFREG:
2426                                 break;
2427                         case S_IFLNK:
2428                                 data->rpc_status = -ELOOP;
2429                                 break;
2430                         case S_IFDIR:
2431                                 data->rpc_status = -EISDIR;
2432                                 break;
2433                         default:
2434                                 data->rpc_status = -ENOTDIR;
2435                         }
2436                 }
2437                 renew_lease(data->o_res.server, data->timestamp);
2438                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2439                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2440         }
2441         data->rpc_done = true;
2442 }
2443
2444 static void nfs4_open_release(void *calldata)
2445 {
2446         struct nfs4_opendata *data = calldata;
2447         struct nfs4_state *state = NULL;
2448
2449         /* If this request hasn't been cancelled, do nothing */
2450         if (!data->cancelled)
2451                 goto out_free;
2452         /* In case of error, no cleanup! */
2453         if (data->rpc_status != 0 || !data->rpc_done)
2454                 goto out_free;
2455         /* In case we need an open_confirm, no cleanup! */
2456         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2457                 goto out_free;
2458         state = nfs4_opendata_to_nfs4_state(data);
2459         if (!IS_ERR(state))
2460                 nfs4_close_state(state, data->o_arg.fmode);
2461 out_free:
2462         nfs4_opendata_put(data);
2463 }
2464
2465 static const struct rpc_call_ops nfs4_open_ops = {
2466         .rpc_call_prepare = nfs4_open_prepare,
2467         .rpc_call_done = nfs4_open_done,
2468         .rpc_release = nfs4_open_release,
2469 };
2470
2471 static int nfs4_run_open_task(struct nfs4_opendata *data,
2472                               struct nfs_open_context *ctx)
2473 {
2474         struct inode *dir = d_inode(data->dir);
2475         struct nfs_server *server = NFS_SERVER(dir);
2476         struct nfs_openargs *o_arg = &data->o_arg;
2477         struct nfs_openres *o_res = &data->o_res;
2478         struct rpc_task *task;
2479         struct rpc_message msg = {
2480                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2481                 .rpc_argp = o_arg,
2482                 .rpc_resp = o_res,
2483                 .rpc_cred = data->owner->so_cred,
2484         };
2485         struct rpc_task_setup task_setup_data = {
2486                 .rpc_client = server->client,
2487                 .rpc_message = &msg,
2488                 .callback_ops = &nfs4_open_ops,
2489                 .callback_data = data,
2490                 .workqueue = nfsiod_workqueue,
2491                 .flags = RPC_TASK_ASYNC,
2492         };
2493         int status;
2494
2495         kref_get(&data->kref);
2496         data->rpc_done = false;
2497         data->rpc_status = 0;
2498         data->cancelled = false;
2499         data->is_recover = false;
2500         if (!ctx) {
2501                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
2502                 data->is_recover = true;
2503                 task_setup_data.flags |= RPC_TASK_TIMEOUT;
2504         } else {
2505                 nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
2506                 pnfs_lgopen_prepare(data, ctx);
2507         }
2508         task = rpc_run_task(&task_setup_data);
2509         if (IS_ERR(task))
2510                 return PTR_ERR(task);
2511         status = rpc_wait_for_completion_task(task);
2512         if (status != 0) {
2513                 data->cancelled = true;
2514                 smp_wmb();
2515         } else
2516                 status = data->rpc_status;
2517         rpc_put_task(task);
2518
2519         return status;
2520 }
2521
2522 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2523 {
2524         struct inode *dir = d_inode(data->dir);
2525         struct nfs_openres *o_res = &data->o_res;
2526         int status;
2527
2528         status = nfs4_run_open_task(data, NULL);
2529         if (status != 0 || !data->rpc_done)
2530                 return status;
2531
2532         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2533
2534         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
2535                 status = _nfs4_proc_open_confirm(data);
2536
2537         return status;
2538 }
2539
2540 /*
2541  * Additional permission checks in order to distinguish between an
2542  * open for read, and an open for execute. This works around the
2543  * fact that NFSv4 OPEN treats read and execute permissions as being
2544  * the same.
2545  * Note that in the non-execute case, we want to turn off permission
2546  * checking if we just created a new file (POSIX open() semantics).
2547  */
2548 static int nfs4_opendata_access(const struct cred *cred,
2549                                 struct nfs4_opendata *opendata,
2550                                 struct nfs4_state *state, fmode_t fmode,
2551                                 int openflags)
2552 {
2553         struct nfs_access_entry cache;
2554         u32 mask, flags;
2555
2556         /* access call failed or for some reason the server doesn't
2557          * support any access modes -- defer access call until later */
2558         if (opendata->o_res.access_supported == 0)
2559                 return 0;
2560
2561         mask = 0;
2562         /*
2563          * Use openflags to check for exec, because fmode won't
2564          * always have FMODE_EXEC set when file open for exec.
2565          */
2566         if (openflags & __FMODE_EXEC) {
2567                 /* ONLY check for exec rights */
2568                 if (S_ISDIR(state->inode->i_mode))
2569                         mask = NFS4_ACCESS_LOOKUP;
2570                 else
2571                         mask = NFS4_ACCESS_EXECUTE;
2572         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2573                 mask = NFS4_ACCESS_READ;
2574
2575         cache.cred = cred;
2576         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2577         nfs_access_add_cache(state->inode, &cache);
2578
2579         flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
2580         if ((mask & ~cache.mask & flags) == 0)
2581                 return 0;
2582
2583         return -EACCES;
2584 }
2585
2586 /*
2587  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2588  */
2589 static int _nfs4_proc_open(struct nfs4_opendata *data,
2590                            struct nfs_open_context *ctx)
2591 {
2592         struct inode *dir = d_inode(data->dir);
2593         struct nfs_server *server = NFS_SERVER(dir);
2594         struct nfs_openargs *o_arg = &data->o_arg;
2595         struct nfs_openres *o_res = &data->o_res;
2596         int status;
2597
2598         status = nfs4_run_open_task(data, ctx);
2599         if (!data->rpc_done)
2600                 return status;
2601         if (status != 0) {
2602                 if (status == -NFS4ERR_BADNAME &&
2603                                 !(o_arg->open_flags & O_CREAT))
2604                         return -ENOENT;
2605                 return status;
2606         }
2607
2608         nfs_fattr_map_and_free_names(server, &data->f_attr);
2609
2610         if (o_arg->open_flags & O_CREAT) {
2611                 if (o_arg->open_flags & O_EXCL)
2612                         data->file_created = true;
2613                 else if (o_res->cinfo.before != o_res->cinfo.after)
2614                         data->file_created = true;
2615                 if (data->file_created ||
2616                     inode_peek_iversion_raw(dir) != o_res->cinfo.after)
2617                         update_changeattr(dir, &o_res->cinfo,
2618                                         o_res->f_attr->time_start, 0);
2619         }
2620         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2621                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2622         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2623                 status = _nfs4_proc_open_confirm(data);
2624                 if (status != 0)
2625                         return status;
2626         }
2627         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
2628                 nfs4_sequence_free_slot(&o_res->seq_res);
2629                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr,
2630                                 o_res->f_label, NULL);
2631         }
2632         return 0;
2633 }
2634
2635 /*
2636  * OPEN_EXPIRED:
2637  *      reclaim state on the server after a network partition.
2638  *      Assumes caller holds the appropriate lock
2639  */
2640 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2641 {
2642         struct nfs4_opendata *opendata;
2643         int ret;
2644
2645         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2646                         NFS4_OPEN_CLAIM_FH);
2647         if (IS_ERR(opendata))
2648                 return PTR_ERR(opendata);
2649         ret = nfs4_open_recover(opendata, state);
2650         if (ret == -ESTALE)
2651                 d_drop(ctx->dentry);
2652         nfs4_opendata_put(opendata);
2653         return ret;
2654 }
2655
2656 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2657 {
2658         struct nfs_server *server = NFS_SERVER(state->inode);
2659         struct nfs4_exception exception = { };
2660         int err;
2661
2662         do {
2663                 err = _nfs4_open_expired(ctx, state);
2664                 trace_nfs4_open_expired(ctx, 0, err);
2665                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2666                         continue;
2667                 switch (err) {
2668                 default:
2669                         goto out;
2670                 case -NFS4ERR_GRACE:
2671                 case -NFS4ERR_DELAY:
2672                         nfs4_handle_exception(server, err, &exception);
2673                         err = 0;
2674                 }
2675         } while (exception.retry);
2676 out:
2677         return err;
2678 }
2679
2680 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2681 {
2682         struct nfs_open_context *ctx;
2683         int ret;
2684
2685         ctx = nfs4_state_find_open_context(state);
2686         if (IS_ERR(ctx))
2687                 return -EAGAIN;
2688         ret = nfs4_do_open_expired(ctx, state);
2689         put_nfs_open_context(ctx);
2690         return ret;
2691 }
2692
2693 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2694                 const nfs4_stateid *stateid)
2695 {
2696         nfs_remove_bad_delegation(state->inode, stateid);
2697         nfs_state_clear_delegation(state);
2698 }
2699
2700 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2701 {
2702         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2703                 nfs_finish_clear_delegation_stateid(state, NULL);
2704 }
2705
2706 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2707 {
2708         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2709         nfs40_clear_delegation_stateid(state);
2710         nfs_state_clear_open_state_flags(state);
2711         return nfs4_open_expired(sp, state);
2712 }
2713
2714 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2715                 nfs4_stateid *stateid,
2716                 const struct cred *cred)
2717 {
2718         return -NFS4ERR_BAD_STATEID;
2719 }
2720
2721 #if defined(CONFIG_NFS_V4_1)
2722 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2723                 nfs4_stateid *stateid,
2724                 const struct cred *cred)
2725 {
2726         int status;
2727
2728         switch (stateid->type) {
2729         default:
2730                 break;
2731         case NFS4_INVALID_STATEID_TYPE:
2732         case NFS4_SPECIAL_STATEID_TYPE:
2733                 return -NFS4ERR_BAD_STATEID;
2734         case NFS4_REVOKED_STATEID_TYPE:
2735                 goto out_free;
2736         }
2737
2738         status = nfs41_test_stateid(server, stateid, cred);
2739         switch (status) {
2740         case -NFS4ERR_EXPIRED:
2741         case -NFS4ERR_ADMIN_REVOKED:
2742         case -NFS4ERR_DELEG_REVOKED:
2743                 break;
2744         default:
2745                 return status;
2746         }
2747 out_free:
2748         /* Ack the revoked state to the server */
2749         nfs41_free_stateid(server, stateid, cred, true);
2750         return -NFS4ERR_EXPIRED;
2751 }
2752
2753 static int nfs41_check_delegation_stateid(struct nfs4_state *state)
2754 {
2755         struct nfs_server *server = NFS_SERVER(state->inode);
2756         nfs4_stateid stateid;
2757         struct nfs_delegation *delegation;
2758         const struct cred *cred = NULL;
2759         int status, ret = NFS_OK;
2760
2761         /* Get the delegation credential for use by test/free_stateid */
2762         rcu_read_lock();
2763         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2764         if (delegation == NULL) {
2765                 rcu_read_unlock();
2766                 nfs_state_clear_delegation(state);
2767                 return NFS_OK;
2768         }
2769
2770         nfs4_stateid_copy(&stateid, &delegation->stateid);
2771
2772         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
2773                                 &delegation->flags)) {
2774                 rcu_read_unlock();
2775                 return NFS_OK;
2776         }
2777
2778         if (delegation->cred)
2779                 cred = get_cred(delegation->cred);
2780         rcu_read_unlock();
2781         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2782         trace_nfs4_test_delegation_stateid(state, NULL, status);
2783         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2784                 nfs_finish_clear_delegation_stateid(state, &stateid);
2785         else
2786                 ret = status;
2787
2788         put_cred(cred);
2789         return ret;
2790 }
2791
2792 static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
2793 {
2794         nfs4_stateid tmp;
2795
2796         if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
2797             nfs4_copy_delegation_stateid(state->inode, state->state,
2798                                 &tmp, NULL) &&
2799             nfs4_stateid_match_other(&state->stateid, &tmp))
2800                 nfs_state_set_delegation(state, &tmp, state->state);
2801         else
2802                 nfs_state_clear_delegation(state);
2803 }
2804
2805 /**
2806  * nfs41_check_expired_locks - possibly free a lock stateid
2807  *
2808  * @state: NFSv4 state for an inode
2809  *
2810  * Returns NFS_OK if recovery for this stateid is now finished.
2811  * Otherwise a negative NFS4ERR value is returned.
2812  */
2813 static int nfs41_check_expired_locks(struct nfs4_state *state)
2814 {
2815         int status, ret = NFS_OK;
2816         struct nfs4_lock_state *lsp, *prev = NULL;
2817         struct nfs_server *server = NFS_SERVER(state->inode);
2818
2819         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2820                 goto out;
2821
2822         spin_lock(&state->state_lock);
2823         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2824                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2825                         const struct cred *cred = lsp->ls_state->owner->so_cred;
2826
2827                         refcount_inc(&lsp->ls_count);
2828                         spin_unlock(&state->state_lock);
2829
2830                         nfs4_put_lock_state(prev);
2831                         prev = lsp;
2832
2833                         status = nfs41_test_and_free_expired_stateid(server,
2834                                         &lsp->ls_stateid,
2835                                         cred);
2836                         trace_nfs4_test_lock_stateid(state, lsp, status);
2837                         if (status == -NFS4ERR_EXPIRED ||
2838                             status == -NFS4ERR_BAD_STATEID) {
2839                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2840                                 lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
2841                                 if (!recover_lost_locks)
2842                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2843                         } else if (status != NFS_OK) {
2844                                 ret = status;
2845                                 nfs4_put_lock_state(prev);
2846                                 goto out;
2847                         }
2848                         spin_lock(&state->state_lock);
2849                 }
2850         }
2851         spin_unlock(&state->state_lock);
2852         nfs4_put_lock_state(prev);
2853 out:
2854         return ret;
2855 }
2856
2857 /**
2858  * nfs41_check_open_stateid - possibly free an open stateid
2859  *
2860  * @state: NFSv4 state for an inode
2861  *
2862  * Returns NFS_OK if recovery for this stateid is now finished.
2863  * Otherwise a negative NFS4ERR value is returned.
2864  */
2865 static int nfs41_check_open_stateid(struct nfs4_state *state)
2866 {
2867         struct nfs_server *server = NFS_SERVER(state->inode);
2868         nfs4_stateid *stateid = &state->open_stateid;
2869         const struct cred *cred = state->owner->so_cred;
2870         int status;
2871
2872         if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
2873                 return -NFS4ERR_BAD_STATEID;
2874         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2875         trace_nfs4_test_open_stateid(state, NULL, status);
2876         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2877                 nfs_state_clear_open_state_flags(state);
2878                 stateid->type = NFS4_INVALID_STATEID_TYPE;
2879                 return status;
2880         }
2881         if (nfs_open_stateid_recover_openmode(state))
2882                 return -NFS4ERR_OPENMODE;
2883         return NFS_OK;
2884 }
2885
2886 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2887 {
2888         int status;
2889
2890         status = nfs41_check_delegation_stateid(state);
2891         if (status != NFS_OK)
2892                 return status;
2893         nfs41_delegation_recover_stateid(state);
2894
2895         status = nfs41_check_expired_locks(state);
2896         if (status != NFS_OK)
2897                 return status;
2898         status = nfs41_check_open_stateid(state);
2899         if (status != NFS_OK)
2900                 status = nfs4_open_expired(sp, state);
2901         return status;
2902 }
2903 #endif
2904
2905 /*
2906  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2907  * fields corresponding to attributes that were used to store the verifier.
2908  * Make sure we clobber those fields in the later setattr call
2909  */
2910 static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2911                                 struct iattr *sattr, struct nfs4_label **label)
2912 {
2913         const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
2914         __u32 attrset[3];
2915         unsigned ret;
2916         unsigned i;
2917
2918         for (i = 0; i < ARRAY_SIZE(attrset); i++) {
2919                 attrset[i] = opendata->o_res.attrset[i];
2920                 if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
2921                         attrset[i] &= ~bitmask[i];
2922         }
2923
2924         ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
2925                 sattr->ia_valid : 0;
2926
2927         if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
2928                 if (sattr->ia_valid & ATTR_ATIME_SET)
2929                         ret |= ATTR_ATIME_SET;
2930                 else
2931                         ret |= ATTR_ATIME;
2932         }
2933
2934         if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
2935                 if (sattr->ia_valid & ATTR_MTIME_SET)
2936                         ret |= ATTR_MTIME_SET;
2937                 else
2938                         ret |= ATTR_MTIME;
2939         }
2940
2941         if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
2942                 *label = NULL;
2943         return ret;
2944 }
2945
2946 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2947                 int flags, struct nfs_open_context *ctx)
2948 {
2949         struct nfs4_state_owner *sp = opendata->owner;
2950         struct nfs_server *server = sp->so_server;
2951         struct dentry *dentry;
2952         struct nfs4_state *state;
2953         fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
2954         unsigned int seq;
2955         int ret;
2956
2957         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2958
2959         ret = _nfs4_proc_open(opendata, ctx);
2960         if (ret != 0)
2961                 goto out;
2962
2963         state = _nfs4_opendata_to_nfs4_state(opendata);
2964         ret = PTR_ERR(state);
2965         if (IS_ERR(state))
2966                 goto out;
2967         ctx->state = state;
2968         if (server->caps & NFS_CAP_POSIX_LOCK)
2969                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2970         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
2971                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
2972
2973         dentry = opendata->dentry;
2974         if (d_really_is_negative(dentry)) {
2975                 struct dentry *alias;
2976                 d_drop(dentry);
2977                 alias = d_exact_alias(dentry, state->inode);
2978                 if (!alias)
2979                         alias = d_splice_alias(igrab(state->inode), dentry);
2980                 /* d_splice_alias() can't fail here - it's a non-directory */
2981                 if (alias) {
2982                         dput(ctx->dentry);
2983                         ctx->dentry = dentry = alias;
2984                 }
2985                 nfs_set_verifier(dentry,
2986                                 nfs_save_change_attribute(d_inode(opendata->dir)));
2987         }
2988
2989         /* Parse layoutget results before we check for access */
2990         pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
2991
2992         ret = nfs4_opendata_access(sp->so_cred, opendata, state,
2993                         acc_mode, flags);
2994         if (ret != 0)
2995                 goto out;
2996
2997         if (d_inode(dentry) == state->inode) {
2998                 nfs_inode_attach_open_context(ctx);
2999                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
3000                         nfs4_schedule_stateid_recovery(server, state);
3001         }
3002
3003 out:
3004         if (!opendata->cancelled)
3005                 nfs4_sequence_free_slot(&opendata->o_res.seq_res);
3006         return ret;
3007 }
3008
3009 /*
3010  * Returns a referenced nfs4_state
3011  */
3012 static int _nfs4_do_open(struct inode *dir,
3013                         struct nfs_open_context *ctx,
3014                         int flags,
3015                         const struct nfs4_open_createattrs *c,
3016                         int *opened)
3017 {
3018         struct nfs4_state_owner  *sp;
3019         struct nfs4_state     *state = NULL;
3020         struct nfs_server       *server = NFS_SERVER(dir);
3021         struct nfs4_opendata *opendata;
3022         struct dentry *dentry = ctx->dentry;
3023         const struct cred *cred = ctx->cred;
3024         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
3025         fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
3026         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
3027         struct iattr *sattr = c->sattr;
3028         struct nfs4_label *label = c->label;
3029         struct nfs4_label *olabel = NULL;
3030         int status;
3031
3032         /* Protect against reboot recovery conflicts */
3033         status = -ENOMEM;
3034         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
3035         if (sp == NULL) {
3036                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
3037                 goto out_err;
3038         }
3039         status = nfs4_client_recover_expired_lease(server->nfs_client);
3040         if (status != 0)
3041                 goto err_put_state_owner;
3042         if (d_really_is_positive(dentry))
3043                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
3044         status = -ENOMEM;
3045         if (d_really_is_positive(dentry))
3046                 claim = NFS4_OPEN_CLAIM_FH;
3047         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
3048                         c, claim, GFP_KERNEL);
3049         if (opendata == NULL)
3050                 goto err_put_state_owner;
3051
3052         if (label) {
3053                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
3054                 if (IS_ERR(olabel)) {
3055                         status = PTR_ERR(olabel);
3056                         goto err_opendata_put;
3057                 }
3058         }
3059
3060         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
3061                 if (!opendata->f_attr.mdsthreshold) {
3062                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
3063                         if (!opendata->f_attr.mdsthreshold)
3064                                 goto err_free_label;
3065                 }
3066                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
3067         }
3068         if (d_really_is_positive(dentry))
3069                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
3070
3071         status = _nfs4_open_and_get_state(opendata, flags, ctx);
3072         if (status != 0)
3073                 goto err_free_label;
3074         state = ctx->state;
3075
3076         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
3077             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
3078                 unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
3079                 /*
3080                  * send create attributes which was not set by open
3081                  * with an extra setattr.
3082                  */
3083                 if (attrs || label) {
3084                         unsigned ia_old = sattr->ia_valid;
3085
3086                         sattr->ia_valid = attrs;
3087                         nfs_fattr_init(opendata->o_res.f_attr);
3088                         status = nfs4_do_setattr(state->inode, cred,
3089                                         opendata->o_res.f_attr, sattr,
3090                                         ctx, label, olabel);
3091                         if (status == 0) {
3092                                 nfs_setattr_update_inode(state->inode, sattr,
3093                                                 opendata->o_res.f_attr);
3094                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
3095                         }
3096                         sattr->ia_valid = ia_old;
3097                 }
3098         }
3099         if (opened && opendata->file_created)
3100                 *opened = 1;
3101
3102         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
3103                 *ctx_th = opendata->f_attr.mdsthreshold;
3104                 opendata->f_attr.mdsthreshold = NULL;
3105         }
3106
3107         nfs4_label_free(olabel);
3108
3109         nfs4_opendata_put(opendata);
3110         nfs4_put_state_owner(sp);
3111         return 0;
3112 err_free_label:
3113         nfs4_label_free(olabel);
3114 err_opendata_put:
3115         nfs4_opendata_put(opendata);
3116 err_put_state_owner:
3117         nfs4_put_state_owner(sp);
3118 out_err:
3119         return status;
3120 }
3121
3122
3123 static struct nfs4_state *nfs4_do_open(struct inode *dir,
3124                                         struct nfs_open_context *ctx,
3125                                         int flags,
3126                                         struct iattr *sattr,
3127                                         struct nfs4_label *label,
3128                                         int *opened)
3129 {
3130         struct nfs_server *server = NFS_SERVER(dir);
3131         struct nfs4_exception exception = {
3132                 .interruptible = true,
3133         };
3134         struct nfs4_state *res;
3135         struct nfs4_open_createattrs c = {
3136                 .label = label,
3137                 .sattr = sattr,
3138                 .verf = {
3139                         [0] = (__u32)jiffies,
3140                         [1] = (__u32)current->pid,
3141                 },
3142         };
3143         int status;
3144
3145         do {
3146                 status = _nfs4_do_open(dir, ctx, flags, &c, opened);
3147                 res = ctx->state;
3148                 trace_nfs4_open_file(ctx, flags, status);
3149                 if (status == 0)
3150                         break;
3151                 /* NOTE: BAD_SEQID means the server and client disagree about the
3152                  * book-keeping w.r.t. state-changing operations
3153                  * (OPEN/CLOSE/LOCK/LOCKU...)
3154                  * It is actually a sign of a bug on the client or on the server.
3155                  *
3156                  * If we receive a BAD_SEQID error in the particular case of
3157                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
3158                  * have unhashed the old state_owner for us, and that we can
3159                  * therefore safely retry using a new one. We should still warn
3160                  * the user though...
3161                  */
3162                 if (status == -NFS4ERR_BAD_SEQID) {
3163                         pr_warn_ratelimited("NFS: v4 server %s "
3164                                         " returned a bad sequence-id error!\n",
3165                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
3166                         exception.retry = 1;
3167                         continue;
3168                 }
3169                 /*
3170                  * BAD_STATEID on OPEN means that the server cancelled our
3171                  * state before it received the OPEN_CONFIRM.
3172                  * Recover by retrying the request as per the discussion
3173                  * on Page 181 of RFC3530.
3174                  */
3175                 if (status == -NFS4ERR_BAD_STATEID) {
3176                         exception.retry = 1;
3177                         continue;
3178                 }
3179                 if (status == -EAGAIN) {
3180                         /* We must have found a delegation */
3181                         exception.retry = 1;
3182                         continue;
3183                 }
3184                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
3185                         continue;
3186                 res = ERR_PTR(nfs4_handle_exception(server,
3187                                         status, &exception));
3188         } while (exception.retry);
3189         return res;
3190 }
3191
3192 static int _nfs4_do_setattr(struct inode *inode,
3193                             struct nfs_setattrargs *arg,
3194                             struct nfs_setattrres *res,
3195                             const struct cred *cred,
3196                             struct nfs_open_context *ctx)
3197 {
3198         struct nfs_server *server = NFS_SERVER(inode);
3199         struct rpc_message msg = {
3200                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
3201                 .rpc_argp       = arg,
3202                 .rpc_resp       = res,
3203                 .rpc_cred       = cred,
3204         };
3205         const struct cred *delegation_cred = NULL;
3206         unsigned long timestamp = jiffies;
3207         bool truncate;
3208         int status;
3209
3210         nfs_fattr_init(res->fattr);
3211
3212         /* Servers should only apply open mode checks for file size changes */
3213         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
3214         if (!truncate)
3215                 goto zero_stateid;
3216
3217         if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
3218                 /* Use that stateid */
3219         } else if (ctx != NULL && ctx->state) {
3220                 struct nfs_lock_context *l_ctx;
3221                 if (!nfs4_valid_open_stateid(ctx->state))
3222                         return -EBADF;
3223                 l_ctx = nfs_get_lock_context(ctx);
3224                 if (IS_ERR(l_ctx))
3225                         return PTR_ERR(l_ctx);
3226                 status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
3227                                                 &arg->stateid, &delegation_cred);
3228                 nfs_put_lock_context(l_ctx);
3229                 if (status == -EIO)
3230                         return -EBADF;
3231         } else {
3232 zero_stateid:
3233                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
3234         }
3235         if (delegation_cred)
3236                 msg.rpc_cred = delegation_cred;
3237
3238         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
3239
3240         put_cred(delegation_cred);
3241         if (status == 0 && ctx != NULL)
3242                 renew_lease(server, timestamp);
3243         trace_nfs4_setattr(inode, &arg->stateid, status);
3244         return status;
3245 }
3246
3247 static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
3248                            struct nfs_fattr *fattr, struct iattr *sattr,
3249                            struct nfs_open_context *ctx, struct nfs4_label *ilabel,
3250                            struct nfs4_label *olabel)
3251 {
3252         struct nfs_server *server = NFS_SERVER(inode);
3253         __u32 bitmask[NFS4_BITMASK_SZ];
3254         struct nfs4_state *state = ctx ? ctx->state : NULL;
3255         struct nfs_setattrargs  arg = {
3256                 .fh             = NFS_FH(inode),
3257                 .iap            = sattr,
3258                 .server         = server,
3259                 .bitmask = bitmask,
3260                 .label          = ilabel,
3261         };
3262         struct nfs_setattrres  res = {
3263                 .fattr          = fattr,
3264                 .label          = olabel,
3265                 .server         = server,
3266         };
3267         struct nfs4_exception exception = {
3268                 .state = state,
3269                 .inode = inode,
3270                 .stateid = &arg.stateid,
3271         };
3272         int err;
3273
3274         do {
3275                 nfs4_bitmap_copy_adjust_setattr(bitmask,
3276                                 nfs4_bitmask(server, olabel),
3277                                 inode);
3278
3279                 err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
3280                 switch (err) {
3281                 case -NFS4ERR_OPENMODE:
3282                         if (!(sattr->ia_valid & ATTR_SIZE)) {
3283                                 pr_warn_once("NFSv4: server %s is incorrectly "
3284                                                 "applying open mode checks to "
3285                                                 "a SETATTR that is not "
3286                                                 "changing file size.\n",
3287                                                 server->nfs_client->cl_hostname);
3288                         }
3289                         if (state && !(state->state & FMODE_WRITE)) {
3290                                 err = -EBADF;
3291                                 if (sattr->ia_valid & ATTR_OPEN)
3292                                         err = -EACCES;
3293                                 goto out;
3294                         }
3295                 }
3296                 err = nfs4_handle_exception(server, err, &exception);
3297         } while (exception.retry);
3298 out:
3299         return err;
3300 }
3301
3302 static bool
3303 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
3304 {
3305         if (inode == NULL || !nfs_have_layout(inode))
3306                 return false;
3307
3308         return pnfs_wait_on_layoutreturn(inode, task);
3309 }
3310
3311 struct nfs4_closedata {
3312         struct inode *inode;
3313         struct nfs4_state *state;
3314         struct nfs_closeargs arg;
3315         struct nfs_closeres res;
3316         struct {
3317                 struct nfs4_layoutreturn_args arg;
3318                 struct nfs4_layoutreturn_res res;
3319                 struct nfs4_xdr_opaque_data ld_private;
3320                 u32 roc_barrier;
3321                 bool roc;
3322         } lr;
3323         struct nfs_fattr fattr;
3324         unsigned long timestamp;
3325 };
3326
3327 static void nfs4_free_closedata(void *data)
3328 {
3329         struct nfs4_closedata *calldata = data;
3330         struct nfs4_state_owner *sp = calldata->state->owner;
3331         struct super_block *sb = calldata->state->inode->i_sb;
3332
3333         if (calldata->lr.roc)
3334                 pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
3335                                 calldata->res.lr_ret);
3336         nfs4_put_open_state(calldata->state);
3337         nfs_free_seqid(calldata->arg.seqid);
3338         nfs4_put_state_owner(sp);
3339         nfs_sb_deactive(sb);
3340         kfree(calldata);
3341 }
3342
3343 static void nfs4_close_done(struct rpc_task *task, void *data)
3344 {
3345         struct nfs4_closedata *calldata = data;
3346         struct nfs4_state *state = calldata->state;
3347         struct nfs_server *server = NFS_SERVER(calldata->inode);
3348         nfs4_stateid *res_stateid = NULL;
3349         struct nfs4_exception exception = {
3350                 .state = state,
3351                 .inode = calldata->inode,
3352                 .stateid = &calldata->arg.stateid,
3353         };
3354
3355         dprintk("%s: begin!\n", __func__);
3356         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3357                 return;
3358         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
3359
3360         /* Handle Layoutreturn errors */
3361         if (calldata->arg.lr_args && task->tk_status != 0) {
3362                 switch (calldata->res.lr_ret) {
3363                 default:
3364                         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3365                         break;
3366                 case 0:
3367                         calldata->arg.lr_args = NULL;
3368                         calldata->res.lr_res = NULL;
3369                         break;
3370                 case -NFS4ERR_OLD_STATEID:
3371                         if (nfs4_layoutreturn_refresh_stateid(&calldata->arg.lr_args->stateid,
3372                                                 &calldata->arg.lr_args->range,
3373                                                 calldata->inode))
3374                                 goto lr_restart;
3375                         /* Fallthrough */
3376                 case -NFS4ERR_ADMIN_REVOKED:
3377                 case -NFS4ERR_DELEG_REVOKED:
3378                 case -NFS4ERR_EXPIRED:
3379                 case -NFS4ERR_BAD_STATEID:
3380                 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
3381                 case -NFS4ERR_WRONG_CRED:
3382                         calldata->arg.lr_args = NULL;
3383                         calldata->res.lr_res = NULL;
3384                         goto lr_restart;
3385                 }
3386         }
3387
3388         /* hmm. we are done with the inode, and in the process of freeing
3389          * the state_owner. we keep this around to process errors
3390          */
3391         switch (task->tk_status) {
3392                 case 0:
3393                         res_stateid = &calldata->res.stateid;
3394                         renew_lease(server, calldata->timestamp);
3395                         break;
3396                 case -NFS4ERR_ACCESS:
3397                         if (calldata->arg.bitmask != NULL) {
3398                                 calldata->arg.bitmask = NULL;
3399                                 calldata->res.fattr = NULL;
3400                                 goto out_restart;
3401
3402                         }
3403                         break;
3404                 case -NFS4ERR_OLD_STATEID:
3405                         /* Did we race with OPEN? */
3406                         if (nfs4_refresh_open_stateid(&calldata->arg.stateid,
3407                                                 state))
3408                                 goto out_restart;
3409                         goto out_release;
3410                 case -NFS4ERR_ADMIN_REVOKED:
3411                 case -NFS4ERR_STALE_STATEID:
3412                 case -NFS4ERR_EXPIRED:
3413                         nfs4_free_revoked_stateid(server,
3414                                         &calldata->arg.stateid,
3415                                         task->tk_msg.rpc_cred);
3416                         /* Fallthrough */
3417                 case -NFS4ERR_BAD_STATEID:
3418                         break;
3419                 default:
3420                         task->tk_status = nfs4_async_handle_exception(task,
3421                                         server, task->tk_status, &exception);
3422                         if (exception.retry)
3423                                 goto out_restart;
3424         }
3425         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3426                         res_stateid, calldata->arg.fmode);
3427 out_release:
3428         task->tk_status = 0;
3429         nfs_release_seqid(calldata->arg.seqid);
3430         nfs_refresh_inode(calldata->inode, &calldata->fattr);
3431         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
3432         return;
3433 lr_restart:
3434         calldata->res.lr_ret = 0;
3435 out_restart:
3436         task->tk_status = 0;
3437         rpc_restart_call_prepare(task);
3438         goto out_release;
3439 }
3440
3441 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3442 {
3443         struct nfs4_closedata *calldata = data;
3444         struct nfs4_state *state = calldata->state;
3445         struct inode *inode = calldata->inode;
3446         struct pnfs_layout_hdr *lo;
3447         bool is_rdonly, is_wronly, is_rdwr;
3448         int call_close = 0;
3449
3450         dprintk("%s: begin!\n", __func__);
3451         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3452                 goto out_wait;
3453
3454         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3455         spin_lock(&state->owner->so_lock);
3456         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3457         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3458         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3459         /* Calculate the change in open mode */
3460         calldata->arg.fmode = 0;
3461         if (state->n_rdwr == 0) {
3462                 if (state->n_rdonly == 0)
3463                         call_close |= is_rdonly;
3464                 else if (is_rdonly)
3465                         calldata->arg.fmode |= FMODE_READ;
3466                 if (state->n_wronly == 0)
3467                         call_close |= is_wronly;
3468                 else if (is_wronly)
3469                         calldata->arg.fmode |= FMODE_WRITE;
3470                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3471                         call_close |= is_rdwr;
3472         } else if (is_rdwr)
3473                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3474
3475         if (!nfs4_valid_open_stateid(state) ||
3476             !nfs4_refresh_open_stateid(&calldata->arg.stateid, state))
3477                 call_close = 0;
3478         spin_unlock(&state->owner->so_lock);
3479
3480         if (!call_close) {
3481                 /* Note: exit _without_ calling nfs4_close_done */
3482                 goto out_no_action;
3483         }
3484
3485         if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
3486                 nfs_release_seqid(calldata->arg.seqid);
3487                 goto out_wait;
3488         }
3489
3490         lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
3491         if (lo && !pnfs_layout_is_valid(lo)) {
3492                 calldata->arg.lr_args = NULL;
3493                 calldata->res.lr_res = NULL;
3494         }
3495
3496         if (calldata->arg.fmode == 0)
3497                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3498
3499         if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
3500                 /* Close-to-open cache consistency revalidation */
3501                 if (!nfs4_have_delegation(inode, FMODE_READ))
3502                         calldata->arg.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
3503                 else
3504                         calldata->arg.bitmask = NULL;
3505         }
3506
3507         calldata->arg.share_access =
3508                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3509                                 calldata->arg.fmode, 0);
3510
3511         if (calldata->res.fattr == NULL)
3512                 calldata->arg.bitmask = NULL;
3513         else if (calldata->arg.bitmask == NULL)
3514                 calldata->res.fattr = NULL;
3515         calldata->timestamp = jiffies;
3516         if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
3517                                 &calldata->arg.seq_args,
3518                                 &calldata->res.seq_res,
3519                                 task) != 0)
3520                 nfs_release_seqid(calldata->arg.seqid);
3521         dprintk("%s: done!\n", __func__);
3522         return;
3523 out_no_action:
3524         task->tk_action = NULL;
3525 out_wait:
3526         nfs4_sequence_done(task, &calldata->res.seq_res);
3527 }
3528
3529 static const struct rpc_call_ops nfs4_close_ops = {
3530         .rpc_call_prepare = nfs4_close_prepare,
3531         .rpc_call_done = nfs4_close_done,
3532         .rpc_release = nfs4_free_closedata,
3533 };
3534
3535 /*
3536  * It is possible for data to be read/written from a mem-mapped file
3537  * after the sys_close call (which hits the vfs layer as a flush).
3538  * This means that we can't safely call nfsv4 close on a file until
3539  * the inode is cleared. This in turn means that we are not good
3540  * NFSv4 citizens - we do not indicate to the server to update the file's
3541  * share state even when we are done with one of the three share
3542  * stateid's in the inode.
3543  *
3544  * NOTE: Caller must be holding the sp->so_owner semaphore!
3545  */
3546 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3547 {
3548         struct nfs_server *server = NFS_SERVER(state->inode);
3549         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3550         struct nfs4_closedata *calldata;
3551         struct nfs4_state_owner *sp = state->owner;
3552         struct rpc_task *task;
3553         struct rpc_message msg = {
3554                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3555                 .rpc_cred = state->owner->so_cred,
3556         };
3557         struct rpc_task_setup task_setup_data = {
3558                 .rpc_client = server->client,
3559                 .rpc_message = &msg,
3560                 .callback_ops = &nfs4_close_ops,
3561                 .workqueue = nfsiod_workqueue,
3562                 .flags = RPC_TASK_ASYNC,
3563         };
3564         int status = -ENOMEM;
3565
3566         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3567                 &task_setup_data.rpc_client, &msg);
3568
3569         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3570         if (calldata == NULL)
3571                 goto out;
3572         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
3573         calldata->inode = state->inode;
3574         calldata->state = state;
3575         calldata->arg.fh = NFS_FH(state->inode);
3576         if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
3577                 goto out_free_calldata;
3578         /* Serialization for the sequence id */
3579         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3580         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3581         if (IS_ERR(calldata->arg.seqid))
3582                 goto out_free_calldata;
3583         nfs_fattr_init(&calldata->fattr);
3584         calldata->arg.fmode = 0;
3585         calldata->lr.arg.ld_private = &calldata->lr.ld_private;
3586         calldata->res.fattr = &calldata->fattr;
3587         calldata->res.seqid = calldata->arg.seqid;
3588         calldata->res.server = server;
3589         calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
3590         calldata->lr.roc = pnfs_roc(state->inode,
3591                         &calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
3592         if (calldata->lr.roc) {
3593                 calldata->arg.lr_args = &calldata->lr.arg;
3594                 calldata->res.lr_res = &calldata->lr.res;
3595         }
3596         nfs_sb_active(calldata->inode->i_sb);
3597
3598         msg.rpc_argp = &calldata->arg;
3599         msg.rpc_resp = &calldata->res;
3600         task_setup_data.callback_data = calldata;
3601         task = rpc_run_task(&task_setup_data);
3602         if (IS_ERR(task))
3603                 return PTR_ERR(task);
3604         status = 0;
3605         if (wait)
3606                 status = rpc_wait_for_completion_task(task);
3607         rpc_put_task(task);
3608         return status;
3609 out_free_calldata:
3610         kfree(calldata);
3611 out:
3612         nfs4_put_open_state(state);
3613         nfs4_put_state_owner(sp);
3614         return status;
3615 }
3616
3617 static struct inode *
3618 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3619                 int open_flags, struct iattr *attr, int *opened)
3620 {
3621         struct nfs4_state *state;
3622         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3623
3624         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3625
3626         /* Protect against concurrent sillydeletes */
3627         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3628
3629         nfs4_label_release_security(label);
3630
3631         if (IS_ERR(state))
3632                 return ERR_CAST(state);
3633         return state->inode;
3634 }
3635
3636 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3637 {
3638         if (ctx->state == NULL)
3639                 return;
3640         if (is_sync)
3641                 nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
3642         else
3643                 nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
3644 }
3645
3646 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3647 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3648 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_MODE_UMASK - 1UL)
3649
3650 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3651 {
3652         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3653         struct nfs4_server_caps_arg args = {
3654                 .fhandle = fhandle,
3655                 .bitmask = bitmask,
3656         };
3657         struct nfs4_server_caps_res res = {};
3658         struct rpc_message msg = {
3659                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3660                 .rpc_argp = &args,
3661                 .rpc_resp = &res,
3662         };
3663         int status;
3664         int i;
3665
3666         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3667                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3668                      FATTR4_WORD0_LINK_SUPPORT |
3669                      FATTR4_WORD0_SYMLINK_SUPPORT |
3670                      FATTR4_WORD0_ACLSUPPORT;
3671         if (minorversion)
3672                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3673
3674         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3675         if (status == 0) {
3676                 /* Sanity check the server answers */
3677                 switch (minorversion) {
3678                 case 0:
3679                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3680                         res.attr_bitmask[2] = 0;
3681                         break;
3682                 case 1:
3683                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3684                         break;
3685                 case 2:
3686                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3687                 }
3688                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3689                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3690                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3691                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3692                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3693                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
3694                                 NFS_CAP_SECURITY_LABEL);
3695                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3696                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3697                         server->caps |= NFS_CAP_ACLS;
3698                 if (res.has_links != 0)
3699                         server->caps |= NFS_CAP_HARDLINKS;
3700                 if (res.has_symlinks != 0)
3701                         server->caps |= NFS_CAP_SYMLINKS;
3702                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3703                         server->caps |= NFS_CAP_FILEID;
3704                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3705                         server->caps |= NFS_CAP_MODE;
3706                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3707                         server->caps |= NFS_CAP_NLINK;
3708                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3709                         server->caps |= NFS_CAP_OWNER;
3710                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3711                         server->caps |= NFS_CAP_OWNER_GROUP;
3712                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3713                         server->caps |= NFS_CAP_ATIME;
3714                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3715                         server->caps |= NFS_CAP_CTIME;
3716                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3717                         server->caps |= NFS_CAP_MTIME;
3718 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3719                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3720                         server->caps |= NFS_CAP_SECURITY_LABEL;
3721 #endif
3722                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3723                                 sizeof(server->attr_bitmask));
3724                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3725
3726                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3727                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3728                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3729                 server->cache_consistency_bitmask[2] = 0;
3730
3731                 /* Avoid a regression due to buggy server */
3732                 for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
3733                         res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
3734                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3735                         sizeof(server->exclcreat_bitmask));
3736
3737                 server->acl_bitmask = res.acl_bitmask;
3738                 server->fh_expire_type = res.fh_expire_type;
3739         }
3740
3741         return status;
3742 }
3743
3744 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3745 {
3746         struct nfs4_exception exception = {
3747                 .interruptible = true,
3748         };
3749         int err;
3750         do {
3751                 err = nfs4_handle_exception(server,
3752                                 _nfs4_server_capabilities(server, fhandle),
3753                                 &exception);
3754         } while (exception.retry);
3755         return err;
3756 }
3757
3758 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3759                 struct nfs_fsinfo *info)
3760 {
3761         u32 bitmask[3];
3762         struct nfs4_lookup_root_arg args = {
3763                 .bitmask = bitmask,
3764         };
3765         struct nfs4_lookup_res res = {
3766                 .server = server,
3767                 .fattr = info->fattr,
3768                 .fh = fhandle,
3769         };
3770         struct rpc_message msg = {
3771                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3772                 .rpc_argp = &args,
3773                 .rpc_resp = &res,
3774         };
3775
3776         bitmask[0] = nfs4_fattr_bitmap[0];
3777         bitmask[1] = nfs4_fattr_bitmap[1];
3778         /*
3779          * Process the label in the upcoming getfattr
3780          */
3781         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3782
3783         nfs_fattr_init(info->fattr);
3784         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3785 }
3786
3787 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3788                 struct nfs_fsinfo *info)
3789 {
3790         struct nfs4_exception exception = {
3791                 .interruptible = true,
3792         };
3793         int err;
3794         do {
3795                 err = _nfs4_lookup_root(server, fhandle, info);
3796                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3797                 switch (err) {
3798                 case 0:
3799                 case -NFS4ERR_WRONGSEC:
3800                         goto out;
3801                 default:
3802                         err = nfs4_handle_exception(server, err, &exception);
3803                 }
3804         } while (exception.retry);
3805 out:
3806         return err;
3807 }
3808
3809 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3810                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3811 {
3812         struct rpc_auth_create_args auth_args = {
3813                 .pseudoflavor = flavor,
3814         };
3815         struct rpc_auth *auth;
3816
3817         auth = rpcauth_create(&auth_args, server->client);
3818         if (IS_ERR(auth))
3819                 return -EACCES;
3820         return nfs4_lookup_root(server, fhandle, info);
3821 }
3822
3823 /*
3824  * Retry pseudoroot lookup with various security flavors.  We do this when:
3825  *
3826  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3827  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3828  *
3829  * Returns zero on success, or a negative NFS4ERR value, or a
3830  * negative errno value.
3831  */
3832 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3833                               struct nfs_fsinfo *info)
3834 {
3835         /* Per 3530bis 15.33.5 */
3836         static const rpc_authflavor_t flav_array[] = {
3837                 RPC_AUTH_GSS_KRB5P,
3838                 RPC_AUTH_GSS_KRB5I,
3839                 RPC_AUTH_GSS_KRB5,
3840                 RPC_AUTH_UNIX,                  /* courtesy */
3841                 RPC_AUTH_NULL,
3842         };
3843         int status = -EPERM;
3844         size_t i;
3845
3846         if (server->auth_info.flavor_len > 0) {
3847                 /* try each flavor specified by user */
3848                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3849                         status = nfs4_lookup_root_sec(server, fhandle, info,
3850                                                 server->auth_info.flavors[i]);
3851                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3852                                 continue;
3853                         break;
3854                 }
3855         } else {
3856                 /* no flavors specified by user, try default list */
3857                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3858                         status = nfs4_lookup_root_sec(server, fhandle, info,
3859                                                       flav_array[i]);
3860                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3861                                 continue;
3862                         break;
3863                 }
3864         }
3865
3866         /*
3867          * -EACCES could mean that the user doesn't have correct permissions
3868          * to access the mount.  It could also mean that we tried to mount
3869          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3870          * existing mount programs don't handle -EACCES very well so it should
3871          * be mapped to -EPERM instead.
3872          */
3873         if (status == -EACCES)
3874                 status = -EPERM;
3875         return status;
3876 }
3877
3878 /**
3879  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3880  * @server: initialized nfs_server handle
3881  * @fhandle: we fill in the pseudo-fs root file handle
3882  * @info: we fill in an FSINFO struct
3883  * @auth_probe: probe the auth flavours
3884  *
3885  * Returns zero on success, or a negative errno.
3886  */
3887 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3888                          struct nfs_fsinfo *info,
3889                          bool auth_probe)
3890 {
3891         int status = 0;
3892
3893         if (!auth_probe)
3894                 status = nfs4_lookup_root(server, fhandle, info);
3895
3896         if (auth_probe || status == NFS4ERR_WRONGSEC)
3897                 status = server->nfs_client->cl_mvops->find_root_sec(server,
3898                                 fhandle, info);
3899
3900         if (status == 0)
3901                 status = nfs4_server_capabilities(server, fhandle);
3902         if (status == 0)
3903                 status = nfs4_do_fsinfo(server, fhandle, info);
3904
3905         return nfs4_map_errors(status);
3906 }
3907
3908 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3909                               struct nfs_fsinfo *info)
3910 {
3911         int error;
3912         struct nfs_fattr *fattr = info->fattr;
3913         struct nfs4_label *label = NULL;
3914
3915         error = nfs4_server_capabilities(server, mntfh);
3916         if (error < 0) {
3917                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3918                 return error;
3919         }
3920
3921         label = nfs4_label_alloc(server, GFP_KERNEL);
3922         if (IS_ERR(label))
3923                 return PTR_ERR(label);
3924
3925         error = nfs4_proc_getattr(server, mntfh, fattr, label, NULL);
3926         if (error < 0) {
3927                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3928                 goto err_free_label;
3929         }
3930
3931         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3932             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3933                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3934
3935 err_free_label:
3936         nfs4_label_free(label);
3937
3938         return error;
3939 }
3940
3941 /*
3942  * Get locations and (maybe) other attributes of a referral.
3943  * Note that we'll actually follow the referral later when
3944  * we detect fsid mismatch in inode revalidation
3945  */
3946 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3947                              const struct qstr *name, struct nfs_fattr *fattr,
3948                              struct nfs_fh *fhandle)
3949 {
3950         int status = -ENOMEM;
3951         struct page *page = NULL;
3952         struct nfs4_fs_locations *locations = NULL;
3953
3954         page = alloc_page(GFP_KERNEL);
3955         if (page == NULL)
3956                 goto out;
3957         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3958         if (locations == NULL)
3959                 goto out;
3960
3961         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3962         if (status != 0)
3963                 goto out;
3964
3965         /*
3966          * If the fsid didn't change, this is a migration event, not a
3967          * referral.  Cause us to drop into the exception handler, which
3968          * will kick off migration recovery.
3969          */
3970         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3971                 dprintk("%s: server did not return a different fsid for"
3972                         " a referral at %s\n", __func__, name->name);
3973                 status = -NFS4ERR_MOVED;
3974                 goto out;
3975         }
3976         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3977         nfs_fixup_referral_attributes(&locations->fattr);
3978
3979         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3980         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3981         memset(fhandle, 0, sizeof(struct nfs_fh));
3982 out:
3983         if (page)
3984                 __free_page(page);
3985         kfree(locations);
3986         return status;
3987 }
3988
3989 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3990                                 struct nfs_fattr *fattr, struct nfs4_label *label,
3991                                 struct inode *inode)
3992 {
3993         __u32 bitmask[NFS4_BITMASK_SZ];
3994         struct nfs4_getattr_arg args = {
3995                 .fh = fhandle,
3996                 .bitmask = bitmask,
3997         };
3998         struct nfs4_getattr_res res = {
3999                 .fattr = fattr,
4000                 .label = label,
4001                 .server = server,
4002         };
4003         struct rpc_message msg = {
4004                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4005                 .rpc_argp = &args,
4006                 .rpc_resp = &res,
4007         };
4008
4009         nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, label), inode);
4010
4011         nfs_fattr_init(fattr);
4012         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4013 }
4014
4015 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
4016                                 struct nfs_fattr *fattr, struct nfs4_label *label,
4017                                 struct inode *inode)
4018 {
4019         struct nfs4_exception exception = {
4020                 .interruptible = true,
4021         };
4022         int err;
4023         do {
4024                 err = _nfs4_proc_getattr(server, fhandle, fattr, label, inode);
4025                 trace_nfs4_getattr(server, fhandle, fattr, err);
4026                 err = nfs4_handle_exception(server, err,
4027                                 &exception);
4028         } while (exception.retry);
4029         return err;
4030 }
4031
4032 /*
4033  * The file is not closed if it is opened due to the a request to change
4034  * the size of the file. The open call will not be needed once the
4035  * VFS layer lookup-intents are implemented.
4036  *
4037  * Close is called when the inode is destroyed.
4038  * If we haven't opened the file for O_WRONLY, we
4039  * need to in the size_change case to obtain a stateid.
4040  *
4041  * Got race?
4042  * Because OPEN is always done by name in nfsv4, it is
4043  * possible that we opened a different file by the same
4044  * name.  We can recognize this race condition, but we
4045  * can't do anything about it besides returning an error.
4046  *
4047  * This will be fixed with VFS changes (lookup-intent).
4048  */
4049 static int
4050 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
4051                   struct iattr *sattr)
4052 {
4053         struct inode *inode = d_inode(dentry);
4054         const struct cred *cred = NULL;
4055         struct nfs_open_context *ctx = NULL;
4056         struct nfs4_label *label = NULL;
4057         int status;
4058
4059         if (pnfs_ld_layoutret_on_setattr(inode) &&
4060             sattr->ia_valid & ATTR_SIZE &&
4061             sattr->ia_size < i_size_read(inode))
4062                 pnfs_commit_and_return_layout(inode);
4063
4064         nfs_fattr_init(fattr);
4065
4066         /* Deal with open(O_TRUNC) */
4067         if (sattr->ia_valid & ATTR_OPEN)
4068                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
4069
4070         /* Optimization: if the end result is no change, don't RPC */
4071         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
4072                 return 0;
4073
4074         /* Search for an existing open(O_WRITE) file */
4075         if (sattr->ia_valid & ATTR_FILE) {
4076
4077                 ctx = nfs_file_open_context(sattr->ia_file);
4078                 if (ctx)
4079                         cred = ctx->cred;
4080         }
4081
4082         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4083         if (IS_ERR(label))
4084                 return PTR_ERR(label);
4085
4086         /* Return any delegations if we're going to change ACLs */
4087         if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
4088                 nfs4_inode_make_writeable(inode);
4089
4090         status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL, label);
4091         if (status == 0) {
4092                 nfs_setattr_update_inode(inode, sattr, fattr);
4093                 nfs_setsecurity(inode, fattr, label);
4094         }
4095         nfs4_label_free(label);
4096         return status;
4097 }
4098
4099 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
4100                 const struct qstr *name, struct nfs_fh *fhandle,
4101                 struct nfs_fattr *fattr, struct nfs4_label *label)
4102 {
4103         struct nfs_server *server = NFS_SERVER(dir);
4104         int                    status;
4105         struct nfs4_lookup_arg args = {
4106                 .bitmask = server->attr_bitmask,
4107                 .dir_fh = NFS_FH(dir),
4108                 .name = name,
4109         };
4110         struct nfs4_lookup_res res = {
4111                 .server = server,
4112                 .fattr = fattr,
4113                 .label = label,
4114                 .fh = fhandle,
4115         };
4116         struct rpc_message msg = {
4117                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
4118                 .rpc_argp = &args,
4119                 .rpc_resp = &res,
4120         };
4121
4122         args.bitmask = nfs4_bitmask(server, label);
4123
4124         nfs_fattr_init(fattr);
4125
4126         dprintk("NFS call  lookup %s\n", name->name);
4127         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
4128         dprintk("NFS reply lookup: %d\n", status);
4129         return status;
4130 }
4131
4132 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
4133 {
4134         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4135                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
4136         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4137         fattr->nlink = 2;
4138 }
4139
4140 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
4141                                    const struct qstr *name, struct nfs_fh *fhandle,
4142                                    struct nfs_fattr *fattr, struct nfs4_label *label)
4143 {
4144         struct nfs4_exception exception = {
4145                 .interruptible = true,
4146         };
4147         struct rpc_clnt *client = *clnt;
4148         int err;
4149         do {
4150                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
4151                 trace_nfs4_lookup(dir, name, err);
4152                 switch (err) {
4153                 case -NFS4ERR_BADNAME:
4154                         err = -ENOENT;
4155                         goto out;
4156                 case -NFS4ERR_MOVED:
4157                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
4158                         if (err == -NFS4ERR_MOVED)
4159                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4160                         goto out;
4161                 case -NFS4ERR_WRONGSEC:
4162                         err = -EPERM;
4163                         if (client != *clnt)
4164                                 goto out;
4165                         client = nfs4_negotiate_security(client, dir, name);
4166                         if (IS_ERR(client))
4167                                 return PTR_ERR(client);
4168
4169                         exception.retry = 1;
4170                         break;
4171                 default:
4172                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
4173                 }
4174         } while (exception.retry);
4175
4176 out:
4177         if (err == 0)
4178                 *clnt = client;
4179         else if (client != *clnt)
4180                 rpc_shutdown_client(client);
4181
4182         return err;
4183 }
4184
4185 static int nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
4186                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4187                             struct nfs4_label *label)
4188 {
4189         int status;
4190         struct rpc_clnt *client = NFS_CLIENT(dir);
4191
4192         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
4193         if (client != NFS_CLIENT(dir)) {
4194                 rpc_shutdown_client(client);
4195                 nfs_fixup_secinfo_attributes(fattr);
4196         }
4197         return status;
4198 }
4199
4200 struct rpc_clnt *
4201 nfs4_proc_lookup_mountpoint(struct inode *dir, const struct qstr *name,
4202                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
4203 {
4204         struct rpc_clnt *client = NFS_CLIENT(dir);
4205         int status;
4206
4207         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
4208         if (status < 0)
4209                 return ERR_PTR(status);
4210         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
4211 }
4212
4213 static int _nfs4_proc_lookupp(struct inode *inode,
4214                 struct nfs_fh *fhandle, struct nfs_fattr *fattr,
4215                 struct nfs4_label *label)
4216 {
4217         struct rpc_clnt *clnt = NFS_CLIENT(inode);
4218         struct nfs_server *server = NFS_SERVER(inode);
4219         int                    status;
4220         struct nfs4_lookupp_arg args = {
4221                 .bitmask = server->attr_bitmask,
4222                 .fh = NFS_FH(inode),
4223         };
4224         struct nfs4_lookupp_res res = {
4225                 .server = server,
4226                 .fattr = fattr,
4227                 .label = label,
4228                 .fh = fhandle,
4229         };
4230         struct rpc_message msg = {
4231                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
4232                 .rpc_argp = &args,
4233                 .rpc_resp = &res,
4234         };
4235
4236         args.bitmask = nfs4_bitmask(server, label);
4237
4238         nfs_fattr_init(fattr);
4239
4240         dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
4241         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
4242                                 &res.seq_res, 0);
4243         dprintk("NFS reply lookupp: %d\n", status);
4244         return status;
4245 }
4246
4247 static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
4248                              struct nfs_fattr *fattr, struct nfs4_label *label)
4249 {
4250         struct nfs4_exception exception = {
4251                 .interruptible = true,
4252         };
4253         int err;
4254         do {
4255                 err = _nfs4_proc_lookupp(inode, fhandle, fattr, label);
4256                 trace_nfs4_lookupp(inode, err);
4257                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4258                                 &exception);
4259         } while (exception.retry);
4260         return err;
4261 }
4262
4263 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4264 {
4265         struct nfs_server *server = NFS_SERVER(inode);
4266         struct nfs4_accessargs args = {
4267                 .fh = NFS_FH(inode),
4268                 .access = entry->mask,
4269         };
4270         struct nfs4_accessres res = {
4271                 .server = server,
4272         };
4273         struct rpc_message msg = {
4274                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
4275                 .rpc_argp = &args,
4276                 .rpc_resp = &res,
4277                 .rpc_cred = entry->cred,
4278         };
4279         int status = 0;
4280
4281         if (!nfs4_have_delegation(inode, FMODE_READ)) {
4282                 res.fattr = nfs_alloc_fattr();
4283                 if (res.fattr == NULL)
4284                         return -ENOMEM;
4285                 args.bitmask = server->cache_consistency_bitmask;
4286         }
4287         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4288         if (!status) {
4289                 nfs_access_set_mask(entry, res.access);
4290                 if (res.fattr)
4291                         nfs_refresh_inode(inode, res.fattr);
4292         }
4293         nfs_free_fattr(res.fattr);
4294         return status;
4295 }
4296
4297 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
4298 {
4299         struct nfs4_exception exception = {
4300                 .interruptible = true,
4301         };
4302         int err;
4303         do {
4304                 err = _nfs4_proc_access(inode, entry);
4305                 trace_nfs4_access(inode, err);
4306                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4307                                 &exception);
4308         } while (exception.retry);
4309         return err;
4310 }
4311
4312 /*
4313  * TODO: For the time being, we don't try to get any attributes
4314  * along with any of the zero-copy operations READ, READDIR,
4315  * READLINK, WRITE.
4316  *
4317  * In the case of the first three, we want to put the GETATTR
4318  * after the read-type operation -- this is because it is hard
4319  * to predict the length of a GETATTR response in v4, and thus
4320  * align the READ data correctly.  This means that the GETATTR
4321  * may end up partially falling into the page cache, and we should
4322  * shift it into the 'tail' of the xdr_buf before processing.
4323  * To do this efficiently, we need to know the total length
4324  * of data received, which doesn't seem to be available outside
4325  * of the RPC layer.
4326  *
4327  * In the case of WRITE, we also want to put the GETATTR after
4328  * the operation -- in this case because we want to make sure
4329  * we get the post-operation mtime and size.
4330  *
4331  * Both of these changes to the XDR layer would in fact be quite
4332  * minor, but I decided to leave them for a subsequent patch.
4333  */
4334 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
4335                 unsigned int pgbase, unsigned int pglen)
4336 {
4337         struct nfs4_readlink args = {
4338                 .fh       = NFS_FH(inode),
4339                 .pgbase   = pgbase,
4340                 .pglen    = pglen,
4341                 .pages    = &page,
4342         };
4343         struct nfs4_readlink_res res;
4344         struct rpc_message msg = {
4345                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
4346                 .rpc_argp = &args,
4347                 .rpc_resp = &res,
4348         };
4349
4350         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
4351 }
4352
4353 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
4354                 unsigned int pgbase, unsigned int pglen)
4355 {
4356         struct nfs4_exception exception = {
4357                 .interruptible = true,
4358         };
4359         int err;
4360         do {
4361                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
4362                 trace_nfs4_readlink(inode, err);
4363                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4364                                 &exception);
4365         } while (exception.retry);
4366         return err;
4367 }
4368
4369 /*
4370  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
4371  */
4372 static int
4373 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
4374                  int flags)
4375 {
4376         struct nfs_server *server = NFS_SERVER(dir);
4377         struct nfs4_label l, *ilabel = NULL;
4378         struct nfs_open_context *ctx;
4379         struct nfs4_state *state;
4380         int status = 0;
4381
4382         ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
4383         if (IS_ERR(ctx))
4384                 return PTR_ERR(ctx);
4385
4386         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
4387
4388         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4389                 sattr->ia_mode &= ~current_umask();
4390         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
4391         if (IS_ERR(state)) {
4392                 status = PTR_ERR(state);
4393                 goto out;
4394         }
4395 out:
4396         nfs4_label_release_security(ilabel);
4397         put_nfs_open_context(ctx);
4398         return status;
4399 }
4400
4401 static int
4402 _nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
4403 {
4404         struct nfs_server *server = NFS_SERVER(dir);
4405         struct nfs_removeargs args = {
4406                 .fh = NFS_FH(dir),
4407                 .name = *name,
4408         };
4409         struct nfs_removeres res = {
4410                 .server = server,
4411         };
4412         struct rpc_message msg = {
4413                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
4414                 .rpc_argp = &args,
4415                 .rpc_resp = &res,
4416         };
4417         unsigned long timestamp = jiffies;
4418         int status;
4419
4420         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
4421         if (status == 0) {
4422                 spin_lock(&dir->i_lock);
4423                 update_changeattr_locked(dir, &res.cinfo, timestamp, 0);
4424                 /* Removing a directory decrements nlink in the parent */
4425                 if (ftype == NF4DIR && dir->i_nlink > 2)
4426                         nfs4_dec_nlink_locked(dir);
4427                 spin_unlock(&dir->i_lock);
4428         }
4429         return status;
4430 }
4431
4432 static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
4433 {
4434         struct nfs4_exception exception = {
4435                 .interruptible = true,
4436         };
4437         struct inode *inode = d_inode(dentry);
4438         int err;
4439
4440         if (inode) {
4441                 if (inode->i_nlink == 1)
4442                         nfs4_inode_return_delegation(inode);
4443                 else
4444                         nfs4_inode_make_writeable(inode);
4445         }
4446         do {
4447                 err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
4448                 trace_nfs4_remove(dir, &dentry->d_name, err);
4449                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4450                                 &exception);
4451         } while (exception.retry);
4452         return err;
4453 }
4454
4455 static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
4456 {
4457         struct nfs4_exception exception = {
4458                 .interruptible = true,
4459         };
4460         int err;
4461
4462         do {
4463                 err = _nfs4_proc_remove(dir, name, NF4DIR);
4464                 trace_nfs4_remove(dir, name, err);
4465                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4466                                 &exception);
4467         } while (exception.retry);
4468         return err;
4469 }
4470
4471 static void nfs4_proc_unlink_setup(struct rpc_message *msg,
4472                 struct dentry *dentry,
4473                 struct inode *inode)
4474 {
4475         struct nfs_removeargs *args = msg->rpc_argp;
4476         struct nfs_removeres *res = msg->rpc_resp;
4477
4478         res->server = NFS_SB(dentry->d_sb);
4479         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
4480         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
4481
4482         nfs_fattr_init(res->dir_attr);
4483
4484         if (inode)
4485                 nfs4_inode_return_delegation(inode);
4486 }
4487
4488 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
4489 {
4490         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
4491                         &data->args.seq_args,
4492                         &data->res.seq_res,
4493                         task);
4494 }
4495
4496 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
4497 {
4498         struct nfs_unlinkdata *data = task->tk_calldata;
4499         struct nfs_removeres *res = &data->res;
4500
4501         if (!nfs4_sequence_done(task, &res->seq_res))
4502                 return 0;
4503         if (nfs4_async_handle_error(task, res->server, NULL,
4504                                     &data->timeout) == -EAGAIN)
4505                 return 0;
4506         if (task->tk_status == 0)
4507                 update_changeattr(dir, &res->cinfo,
4508                                 res->dir_attr->time_start, 0);
4509         return 1;
4510 }
4511
4512 static void nfs4_proc_rename_setup(struct rpc_message *msg,
4513                 struct dentry *old_dentry,
4514                 struct dentry *new_dentry)
4515 {
4516         struct nfs_renameargs *arg = msg->rpc_argp;
4517         struct nfs_renameres *res = msg->rpc_resp;
4518         struct inode *old_inode = d_inode(old_dentry);
4519         struct inode *new_inode = d_inode(new_dentry);
4520
4521         if (old_inode)
4522                 nfs4_inode_make_writeable(old_inode);
4523         if (new_inode)
4524                 nfs4_inode_return_delegation(new_inode);
4525         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
4526         res->server = NFS_SB(old_dentry->d_sb);
4527         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
4528 }
4529
4530 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
4531 {
4532         nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
4533                         &data->args.seq_args,
4534                         &data->res.seq_res,
4535                         task);
4536 }
4537
4538 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
4539                                  struct inode *new_dir)
4540 {
4541         struct nfs_renamedata *data = task->tk_calldata;
4542         struct nfs_renameres *res = &data->res;
4543
4544         if (!nfs4_sequence_done(task, &res->seq_res))
4545                 return 0;
4546         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
4547                 return 0;
4548
4549         if (task->tk_status == 0) {
4550                 if (new_dir != old_dir) {
4551                         /* Note: If we moved a directory, nlink will change */
4552                         update_changeattr(old_dir, &res->old_cinfo,
4553                                         res->old_fattr->time_start,
4554                                         NFS_INO_INVALID_OTHER);
4555                         update_changeattr(new_dir, &res->new_cinfo,
4556                                         res->new_fattr->time_start,
4557                                         NFS_INO_INVALID_OTHER);
4558                 } else
4559                         update_changeattr(old_dir, &res->old_cinfo,
4560                                         res->old_fattr->time_start,
4561                                         0);
4562         }
4563         return 1;
4564 }
4565
4566 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4567 {
4568         struct nfs_server *server = NFS_SERVER(inode);
4569         __u32 bitmask[NFS4_BITMASK_SZ];
4570         struct nfs4_link_arg arg = {
4571                 .fh     = NFS_FH(inode),
4572                 .dir_fh = NFS_FH(dir),
4573                 .name   = name,
4574                 .bitmask = bitmask,
4575         };
4576         struct nfs4_link_res res = {
4577                 .server = server,
4578                 .label = NULL,
4579         };
4580         struct rpc_message msg = {
4581                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4582                 .rpc_argp = &arg,
4583                 .rpc_resp = &res,
4584         };
4585         int status = -ENOMEM;
4586
4587         res.fattr = nfs_alloc_fattr();
4588         if (res.fattr == NULL)
4589                 goto out;
4590
4591         res.label = nfs4_label_alloc(server, GFP_KERNEL);
4592         if (IS_ERR(res.label)) {
4593                 status = PTR_ERR(res.label);
4594                 goto out;
4595         }
4596
4597         nfs4_inode_make_writeable(inode);
4598         nfs4_bitmap_copy_adjust_setattr(bitmask, nfs4_bitmask(server, res.label), inode);
4599
4600         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4601         if (!status) {
4602                 update_changeattr(dir, &res.cinfo, res.fattr->time_start, 0);
4603                 status = nfs_post_op_update_inode(inode, res.fattr);
4604                 if (!status)
4605                         nfs_setsecurity(inode, res.fattr, res.label);
4606         }
4607
4608
4609         nfs4_label_free(res.label);
4610
4611 out:
4612         nfs_free_fattr(res.fattr);
4613         return status;
4614 }
4615
4616 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4617 {
4618         struct nfs4_exception exception = {
4619                 .interruptible = true,
4620         };
4621         int err;
4622         do {
4623                 err = nfs4_handle_exception(NFS_SERVER(inode),
4624                                 _nfs4_proc_link(inode, dir, name),
4625                                 &exception);
4626         } while (exception.retry);
4627         return err;
4628 }
4629
4630 struct nfs4_createdata {
4631         struct rpc_message msg;
4632         struct nfs4_create_arg arg;
4633         struct nfs4_create_res res;
4634         struct nfs_fh fh;
4635         struct nfs_fattr fattr;
4636         struct nfs4_label *label;
4637 };
4638
4639 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4640                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4641 {
4642         struct nfs4_createdata *data;
4643
4644         data = kzalloc(sizeof(*data), GFP_KERNEL);
4645         if (data != NULL) {
4646                 struct nfs_server *server = NFS_SERVER(dir);
4647
4648                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
4649                 if (IS_ERR(data->label))
4650                         goto out_free;
4651
4652                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4653                 data->msg.rpc_argp = &data->arg;
4654                 data->msg.rpc_resp = &data->res;
4655                 data->arg.dir_fh = NFS_FH(dir);
4656                 data->arg.server = server;
4657                 data->arg.name = name;
4658                 data->arg.attrs = sattr;
4659                 data->arg.ftype = ftype;
4660                 data->arg.bitmask = nfs4_bitmask(server, data->label);
4661                 data->arg.umask = current_umask();
4662                 data->res.server = server;
4663                 data->res.fh = &data->fh;
4664                 data->res.fattr = &data->fattr;
4665                 data->res.label = data->label;
4666                 nfs_fattr_init(data->res.fattr);
4667         }
4668         return data;
4669 out_free:
4670         kfree(data);
4671         return NULL;
4672 }
4673
4674 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4675 {
4676         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4677                                     &data->arg.seq_args, &data->res.seq_res, 1);
4678         if (status == 0) {
4679                 spin_lock(&dir->i_lock);
4680                 update_changeattr_locked(dir, &data->res.dir_cinfo,
4681                                 data->res.fattr->time_start, 0);
4682                 /* Creating a directory bumps nlink in the parent */
4683                 if (data->arg.ftype == NF4DIR)
4684                         nfs4_inc_nlink_locked(dir);
4685                 spin_unlock(&dir->i_lock);
4686                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
4687         }
4688         return status;
4689 }
4690
4691 static void nfs4_free_createdata(struct nfs4_createdata *data)
4692 {
4693         nfs4_label_free(data->label);
4694         kfree(data);
4695 }
4696
4697 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4698                 struct page *page, unsigned int len, struct iattr *sattr,
4699                 struct nfs4_label *label)
4700 {
4701         struct nfs4_createdata *data;
4702         int status = -ENAMETOOLONG;
4703
4704         if (len > NFS4_MAXPATHLEN)
4705                 goto out;
4706
4707         status = -ENOMEM;
4708         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
4709         if (data == NULL)
4710                 goto out;
4711
4712         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
4713         data->arg.u.symlink.pages = &page;
4714         data->arg.u.symlink.len = len;
4715         data->arg.label = label;
4716
4717         status = nfs4_do_create(dir, dentry, data);
4718
4719         nfs4_free_createdata(data);
4720 out:
4721         return status;
4722 }
4723
4724 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4725                 struct page *page, unsigned int len, struct iattr *sattr)
4726 {
4727         struct nfs4_exception exception = {
4728                 .interruptible = true,
4729         };
4730         struct nfs4_label l, *label = NULL;
4731         int err;
4732
4733         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4734
4735         do {
4736                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
4737                 trace_nfs4_symlink(dir, &dentry->d_name, err);
4738                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4739                                 &exception);
4740         } while (exception.retry);
4741
4742         nfs4_label_release_security(label);
4743         return err;
4744 }
4745
4746 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4747                 struct iattr *sattr, struct nfs4_label *label)
4748 {
4749         struct nfs4_createdata *data;
4750         int status = -ENOMEM;
4751
4752         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4753         if (data == NULL)
4754                 goto out;
4755
4756         data->arg.label = label;
4757         status = nfs4_do_create(dir, dentry, data);
4758
4759         nfs4_free_createdata(data);
4760 out:
4761         return status;
4762 }
4763
4764 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4765                 struct iattr *sattr)
4766 {
4767         struct nfs_server *server = NFS_SERVER(dir);
4768         struct nfs4_exception exception = {
4769                 .interruptible = true,
4770         };
4771         struct nfs4_label l, *label = NULL;
4772         int err;
4773
4774         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4775
4776         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4777                 sattr->ia_mode &= ~current_umask();
4778         do {
4779                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4780                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4781                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4782                                 &exception);
4783         } while (exception.retry);
4784         nfs4_label_release_security(label);
4785
4786         return err;
4787 }
4788
4789 static int _nfs4_proc_readdir(struct dentry *dentry, const struct cred *cred,
4790                 u64 cookie, struct page **pages, unsigned int count, bool plus)
4791 {
4792         struct inode            *dir = d_inode(dentry);
4793         struct nfs4_readdir_arg args = {
4794                 .fh = NFS_FH(dir),
4795                 .pages = pages,
4796                 .pgbase = 0,
4797                 .count = count,
4798                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4799                 .plus = plus,
4800         };
4801         struct nfs4_readdir_res res;
4802         struct rpc_message msg = {
4803                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4804                 .rpc_argp = &args,
4805                 .rpc_resp = &res,
4806                 .rpc_cred = cred,
4807         };
4808         int                     status;
4809
4810         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4811                         dentry,
4812                         (unsigned long long)cookie);
4813         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4814         res.pgbase = args.pgbase;
4815         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4816         if (status >= 0) {
4817                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4818                 status += args.pgbase;
4819         }
4820
4821         nfs_invalidate_atime(dir);
4822
4823         dprintk("%s: returns %d\n", __func__, status);
4824         return status;
4825 }
4826
4827 static int nfs4_proc_readdir(struct dentry *dentry, const struct cred *cred,
4828                 u64 cookie, struct page **pages, unsigned int count, bool plus)
4829 {
4830         struct nfs4_exception exception = {
4831                 .interruptible = true,
4832         };
4833         int err;
4834         do {
4835                 err = _nfs4_proc_readdir(dentry, cred, cookie,
4836                                 pages, count, plus);
4837                 trace_nfs4_readdir(d_inode(dentry), err);
4838                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4839                                 &exception);
4840         } while (exception.retry);
4841         return err;
4842 }
4843
4844 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4845                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4846 {
4847         struct nfs4_createdata *data;
4848         int mode = sattr->ia_mode;
4849         int status = -ENOMEM;
4850
4851         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
4852         if (data == NULL)
4853                 goto out;
4854
4855         if (S_ISFIFO(mode))
4856                 data->arg.ftype = NF4FIFO;
4857         else if (S_ISBLK(mode)) {
4858                 data->arg.ftype = NF4BLK;
4859                 data->arg.u.device.specdata1 = MAJOR(rdev);
4860                 data->arg.u.device.specdata2 = MINOR(rdev);
4861         }
4862         else if (S_ISCHR(mode)) {
4863                 data->arg.ftype = NF4CHR;
4864                 data->arg.u.device.specdata1 = MAJOR(rdev);
4865                 data->arg.u.device.specdata2 = MINOR(rdev);
4866         } else if (!S_ISSOCK(mode)) {
4867                 status = -EINVAL;
4868                 goto out_free;
4869         }
4870
4871         data->arg.label = label;
4872         status = nfs4_do_create(dir, dentry, data);
4873 out_free:
4874         nfs4_free_createdata(data);
4875 out:
4876         return status;
4877 }
4878
4879 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4880                 struct iattr *sattr, dev_t rdev)
4881 {
4882         struct nfs_server *server = NFS_SERVER(dir);
4883         struct nfs4_exception exception = {
4884                 .interruptible = true,
4885         };
4886         struct nfs4_label l, *label = NULL;
4887         int err;
4888
4889         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4890
4891         if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
4892                 sattr->ia_mode &= ~current_umask();
4893         do {
4894                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4895                 trace_nfs4_mknod(dir, &dentry->d_name, err);
4896                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4897                                 &exception);
4898         } while (exception.retry);
4899
4900         nfs4_label_release_security(label);
4901
4902         return err;
4903 }
4904
4905 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
4906                  struct nfs_fsstat *fsstat)
4907 {
4908         struct nfs4_statfs_arg args = {
4909                 .fh = fhandle,
4910                 .bitmask = server->attr_bitmask,
4911         };
4912         struct nfs4_statfs_res res = {
4913                 .fsstat = fsstat,
4914         };
4915         struct rpc_message msg = {
4916                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
4917                 .rpc_argp = &args,
4918                 .rpc_resp = &res,
4919         };
4920
4921         nfs_fattr_init(fsstat->fattr);
4922         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4923 }
4924
4925 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4926 {
4927         struct nfs4_exception exception = {
4928                 .interruptible = true,
4929         };
4930         int err;
4931         do {
4932                 err = nfs4_handle_exception(server,
4933                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4934                                 &exception);
4935         } while (exception.retry);
4936         return err;
4937 }
4938
4939 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4940                 struct nfs_fsinfo *fsinfo)
4941 {
4942         struct nfs4_fsinfo_arg args = {
4943                 .fh = fhandle,
4944                 .bitmask = server->attr_bitmask,
4945         };
4946         struct nfs4_fsinfo_res res = {
4947                 .fsinfo = fsinfo,
4948         };
4949         struct rpc_message msg = {
4950                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4951                 .rpc_argp = &args,
4952                 .rpc_resp = &res,
4953         };
4954
4955         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4956 }
4957
4958 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4959 {
4960         struct nfs4_exception exception = {
4961                 .interruptible = true,
4962         };
4963         unsigned long now = jiffies;
4964         int err;
4965
4966         do {
4967                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4968                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4969                 if (err == 0) {
4970                         nfs4_set_lease_period(server->nfs_client,
4971                                         fsinfo->lease_time * HZ,
4972                                         now);
4973                         break;
4974                 }
4975                 err = nfs4_handle_exception(server, err, &exception);
4976         } while (exception.retry);
4977         return err;
4978 }
4979
4980 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4981 {
4982         int error;
4983
4984         nfs_fattr_init(fsinfo->fattr);
4985         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4986         if (error == 0) {
4987                 /* block layout checks this! */
4988                 server->pnfs_blksize = fsinfo->blksize;
4989                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
4990         }
4991
4992         return error;
4993 }
4994
4995 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4996                 struct nfs_pathconf *pathconf)
4997 {
4998         struct nfs4_pathconf_arg args = {
4999                 .fh = fhandle,
5000                 .bitmask = server->attr_bitmask,
5001         };
5002         struct nfs4_pathconf_res res = {
5003                 .pathconf = pathconf,
5004         };
5005         struct rpc_message msg = {
5006                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
5007                 .rpc_argp = &args,
5008                 .rpc_resp = &res,
5009         };
5010
5011         /* None of the pathconf attributes are mandatory to implement */
5012         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
5013                 memset(pathconf, 0, sizeof(*pathconf));
5014                 return 0;
5015         }
5016
5017         nfs_fattr_init(pathconf->fattr);
5018         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
5019 }
5020
5021 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
5022                 struct nfs_pathconf *pathconf)
5023 {
5024         struct nfs4_exception exception = {
5025                 .interruptible = true,
5026         };
5027         int err;
5028
5029         do {
5030                 err = nfs4_handle_exception(server,
5031                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
5032                                 &exception);
5033         } while (exception.retry);
5034         return err;
5035 }
5036
5037 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
5038                 const struct nfs_open_context *ctx,
5039                 const struct nfs_lock_context *l_ctx,
5040                 fmode_t fmode)
5041 {
5042         return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
5043 }
5044 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
5045
5046 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
5047                 const struct nfs_open_context *ctx,
5048                 const struct nfs_lock_context *l_ctx,
5049                 fmode_t fmode)
5050 {
5051         nfs4_stateid current_stateid;
5052
5053         /* If the current stateid represents a lost lock, then exit */
5054         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
5055                 return true;
5056         return nfs4_stateid_match(stateid, &current_stateid);
5057 }
5058
5059 static bool nfs4_error_stateid_expired(int err)
5060 {
5061         switch (err) {
5062         case -NFS4ERR_DELEG_REVOKED:
5063         case -NFS4ERR_ADMIN_REVOKED:
5064         case -NFS4ERR_BAD_STATEID:
5065         case -NFS4ERR_STALE_STATEID:
5066         case -NFS4ERR_OLD_STATEID:
5067         case -NFS4ERR_OPENMODE:
5068         case -NFS4ERR_EXPIRED:
5069                 return true;
5070         }
5071         return false;
5072 }
5073
5074 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
5075 {
5076         struct nfs_server *server = NFS_SERVER(hdr->inode);
5077
5078         trace_nfs4_read(hdr, task->tk_status);
5079         if (task->tk_status < 0) {
5080                 struct nfs4_exception exception = {
5081                         .inode = hdr->inode,
5082                         .state = hdr->args.context->state,
5083                         .stateid = &hdr->args.stateid,
5084                 };
5085                 task->tk_status = nfs4_async_handle_exception(task,
5086                                 server, task->tk_status, &exception);
5087                 if (exception.retry) {
5088                         rpc_restart_call_prepare(task);
5089                         return -EAGAIN;
5090                 }
5091         }
5092
5093         if (task->tk_status > 0)
5094                 renew_lease(server, hdr->timestamp);
5095         return 0;
5096 }
5097
5098 static bool nfs4_read_stateid_changed(struct rpc_task *task,
5099                 struct nfs_pgio_args *args)
5100 {
5101
5102         if (!nfs4_error_stateid_expired(task->tk_status) ||
5103                 nfs4_stateid_is_current(&args->stateid,
5104                                 args->context,
5105                                 args->lock_context,
5106                                 FMODE_READ))
5107                 return false;
5108         rpc_restart_call_prepare(task);
5109         return true;
5110 }
5111
5112 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5113 {
5114
5115         dprintk("--> %s\n", __func__);
5116
5117         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5118                 return -EAGAIN;
5119         if (nfs4_read_stateid_changed(task, &hdr->args))
5120                 return -EAGAIN;
5121         if (task->tk_status > 0)
5122                 nfs_invalidate_atime(hdr->inode);
5123         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5124                                     nfs4_read_done_cb(task, hdr);
5125 }
5126
5127 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
5128                                  struct rpc_message *msg)
5129 {
5130         hdr->timestamp   = jiffies;
5131         if (!hdr->pgio_done_cb)
5132                 hdr->pgio_done_cb = nfs4_read_done_cb;
5133         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
5134         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
5135 }
5136
5137 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
5138                                       struct nfs_pgio_header *hdr)
5139 {
5140         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
5141                         &hdr->args.seq_args,
5142                         &hdr->res.seq_res,
5143                         task))
5144                 return 0;
5145         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
5146                                 hdr->args.lock_context,
5147                                 hdr->rw_mode) == -EIO)
5148                 return -EIO;
5149         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
5150                 return -EIO;
5151         return 0;
5152 }
5153
5154 static int nfs4_write_done_cb(struct rpc_task *task,
5155                               struct nfs_pgio_header *hdr)
5156 {
5157         struct inode *inode = hdr->inode;
5158
5159         trace_nfs4_write(hdr, task->tk_status);
5160         if (task->tk_status < 0) {
5161                 struct nfs4_exception exception = {
5162                         .inode = hdr->inode,
5163                         .state = hdr->args.context->state,
5164                         .stateid = &hdr->args.stateid,
5165                 };
5166                 task->tk_status = nfs4_async_handle_exception(task,
5167                                 NFS_SERVER(inode), task->tk_status,
5168                                 &exception);
5169                 if (exception.retry) {
5170                         rpc_restart_call_prepare(task);
5171                         return -EAGAIN;
5172                 }
5173         }
5174         if (task->tk_status >= 0) {
5175                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
5176                 nfs_writeback_update_inode(hdr);
5177         }
5178         return 0;
5179 }
5180
5181 static bool nfs4_write_stateid_changed(struct rpc_task *task,
5182                 struct nfs_pgio_args *args)
5183 {
5184
5185         if (!nfs4_error_stateid_expired(task->tk_status) ||
5186                 nfs4_stateid_is_current(&args->stateid,
5187                                 args->context,
5188                                 args->lock_context,
5189                                 FMODE_WRITE))
5190                 return false;
5191         rpc_restart_call_prepare(task);
5192         return true;
5193 }
5194
5195 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
5196 {
5197         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
5198                 return -EAGAIN;
5199         if (nfs4_write_stateid_changed(task, &hdr->args))
5200                 return -EAGAIN;
5201         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
5202                 nfs4_write_done_cb(task, hdr);
5203 }
5204
5205 static
5206 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
5207 {
5208         /* Don't request attributes for pNFS or O_DIRECT writes */
5209         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
5210                 return false;
5211         /* Otherwise, request attributes if and only if we don't hold
5212          * a delegation
5213          */
5214         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
5215 }
5216
5217 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
5218                                   struct rpc_message *msg,
5219                                   struct rpc_clnt **clnt)
5220 {
5221         struct nfs_server *server = NFS_SERVER(hdr->inode);
5222
5223         if (!nfs4_write_need_cache_consistency_data(hdr)) {
5224                 hdr->args.bitmask = NULL;
5225                 hdr->res.fattr = NULL;
5226         } else
5227                 hdr->args.bitmask = server->cache_consistency_bitmask;
5228
5229         if (!hdr->pgio_done_cb)
5230                 hdr->pgio_done_cb = nfs4_write_done_cb;
5231         hdr->res.server = server;
5232         hdr->timestamp   = jiffies;
5233
5234         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
5235         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1, 0);
5236         nfs4_state_protect_write(server->nfs_client, clnt, msg, hdr);
5237 }
5238
5239 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
5240 {
5241         nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
5242                         &data->args.seq_args,
5243                         &data->res.seq_res,
5244                         task);
5245 }
5246
5247 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
5248 {
5249         struct inode *inode = data->inode;
5250
5251         trace_nfs4_commit(data, task->tk_status);
5252         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
5253                                     NULL, NULL) == -EAGAIN) {
5254                 rpc_restart_call_prepare(task);
5255                 return -EAGAIN;
5256         }
5257         return 0;
5258 }
5259
5260 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
5261 {
5262         if (!nfs4_sequence_done(task, &data->res.seq_res))
5263                 return -EAGAIN;
5264         return data->commit_done_cb(task, data);
5265 }
5266
5267 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
5268                                    struct rpc_clnt **clnt)
5269 {
5270         struct nfs_server *server = NFS_SERVER(data->inode);
5271
5272         if (data->commit_done_cb == NULL)
5273                 data->commit_done_cb = nfs4_commit_done_cb;
5274         data->res.server = server;
5275         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
5276         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
5277         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
5278 }
5279
5280 static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
5281                                 struct nfs_commitres *res)
5282 {
5283         struct inode *dst_inode = file_inode(dst);
5284         struct nfs_server *server = NFS_SERVER(dst_inode);
5285         struct rpc_message msg = {
5286                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
5287                 .rpc_argp = args,
5288                 .rpc_resp = res,
5289         };
5290
5291         args->fh = NFS_FH(dst_inode);
5292         return nfs4_call_sync(server->client, server, &msg,
5293                         &args->seq_args, &res->seq_res, 1);
5294 }
5295
5296 int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
5297 {
5298         struct nfs_commitargs args = {
5299                 .offset = offset,
5300                 .count = count,
5301         };
5302         struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
5303         struct nfs4_exception exception = { };
5304         int status;
5305
5306         do {
5307                 status = _nfs4_proc_commit(dst, &args, res);
5308                 status = nfs4_handle_exception(dst_server, status, &exception);
5309         } while (exception.retry);
5310
5311         return status;
5312 }
5313
5314 struct nfs4_renewdata {
5315         struct nfs_client       *client;
5316         unsigned long           timestamp;
5317 };
5318
5319 /*
5320  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
5321  * standalone procedure for queueing an asynchronous RENEW.
5322  */
5323 static void nfs4_renew_release(void *calldata)
5324 {
5325         struct nfs4_renewdata *data = calldata;
5326         struct nfs_client *clp = data->client;
5327
5328         if (refcount_read(&clp->cl_count) > 1)
5329                 nfs4_schedule_state_renewal(clp);
5330         nfs_put_client(clp);
5331         kfree(data);
5332 }
5333
5334 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
5335 {
5336         struct nfs4_renewdata *data = calldata;
5337         struct nfs_client *clp = data->client;
5338         unsigned long timestamp = data->timestamp;
5339
5340         trace_nfs4_renew_async(clp, task->tk_status);
5341         switch (task->tk_status) {
5342         case 0:
5343                 break;
5344         case -NFS4ERR_LEASE_MOVED:
5345                 nfs4_schedule_lease_moved_recovery(clp);
5346                 break;
5347         default:
5348                 /* Unless we're shutting down, schedule state recovery! */
5349                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
5350                         return;
5351                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
5352                         nfs4_schedule_lease_recovery(clp);
5353                         return;
5354                 }
5355                 nfs4_schedule_path_down_recovery(clp);
5356         }
5357         do_renew_lease(clp, timestamp);
5358 }
5359
5360 static const struct rpc_call_ops nfs4_renew_ops = {
5361         .rpc_call_done = nfs4_renew_done,
5362         .rpc_release = nfs4_renew_release,
5363 };
5364
5365 static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
5366 {
5367         struct rpc_message msg = {
5368                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5369                 .rpc_argp       = clp,
5370                 .rpc_cred       = cred,
5371         };
5372         struct nfs4_renewdata *data;
5373
5374         if (renew_flags == 0)
5375                 return 0;
5376         if (!refcount_inc_not_zero(&clp->cl_count))
5377                 return -EIO;
5378         data = kmalloc(sizeof(*data), GFP_NOFS);
5379         if (data == NULL) {
5380                 nfs_put_client(clp);
5381                 return -ENOMEM;
5382         }
5383         data->client = clp;
5384         data->timestamp = jiffies;
5385         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
5386                         &nfs4_renew_ops, data);
5387 }
5388
5389 static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
5390 {
5391         struct rpc_message msg = {
5392                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
5393                 .rpc_argp       = clp,
5394                 .rpc_cred       = cred,
5395         };
5396         unsigned long now = jiffies;
5397         int status;
5398
5399         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5400         if (status < 0)
5401                 return status;
5402         do_renew_lease(clp, now);
5403         return 0;
5404 }
5405
5406 static inline int nfs4_server_supports_acls(struct nfs_server *server)
5407 {
5408         return server->caps & NFS_CAP_ACLS;
5409 }
5410
5411 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
5412  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
5413  * the stack.
5414  */
5415 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
5416
5417 static int buf_to_pages_noslab(const void *buf, size_t buflen,
5418                 struct page **pages)
5419 {
5420         struct page *newpage, **spages;
5421         int rc = 0;
5422         size_t len;
5423         spages = pages;
5424
5425         do {
5426                 len = min_t(size_t, PAGE_SIZE, buflen);
5427                 newpage = alloc_page(GFP_KERNEL);
5428
5429                 if (newpage == NULL)
5430                         goto unwind;
5431                 memcpy(page_address(newpage), buf, len);
5432                 buf += len;
5433                 buflen -= len;
5434                 *pages++ = newpage;
5435                 rc++;
5436         } while (buflen != 0);
5437
5438         return rc;
5439
5440 unwind:
5441         for(; rc > 0; rc--)
5442                 __free_page(spages[rc-1]);
5443         return -ENOMEM;
5444 }
5445
5446 struct nfs4_cached_acl {
5447         int cached;
5448         size_t len;
5449         char data[0];
5450 };
5451
5452 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
5453 {
5454         struct nfs_inode *nfsi = NFS_I(inode);
5455
5456         spin_lock(&inode->i_lock);
5457         kfree(nfsi->nfs4_acl);
5458         nfsi->nfs4_acl = acl;
5459         spin_unlock(&inode->i_lock);
5460 }
5461
5462 static void nfs4_zap_acl_attr(struct inode *inode)
5463 {
5464         nfs4_set_cached_acl(inode, NULL);
5465 }
5466
5467 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
5468 {
5469         struct nfs_inode *nfsi = NFS_I(inode);
5470         struct nfs4_cached_acl *acl;
5471         int ret = -ENOENT;
5472
5473         spin_lock(&inode->i_lock);
5474         acl = nfsi->nfs4_acl;
5475         if (acl == NULL)
5476                 goto out;
5477         if (buf == NULL) /* user is just asking for length */
5478                 goto out_len;
5479         if (acl->cached == 0)
5480                 goto out;
5481         ret = -ERANGE; /* see getxattr(2) man page */
5482         if (acl->len > buflen)
5483                 goto out;
5484         memcpy(buf, acl->data, acl->len);
5485 out_len:
5486         ret = acl->len;
5487 out:
5488         spin_unlock(&inode->i_lock);
5489         return ret;
5490 }
5491
5492 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
5493 {
5494         struct nfs4_cached_acl *acl;
5495         size_t buflen = sizeof(*acl) + acl_len;
5496
5497         if (buflen <= PAGE_SIZE) {
5498                 acl = kmalloc(buflen, GFP_KERNEL);
5499                 if (acl == NULL)
5500                         goto out;
5501                 acl->cached = 1;
5502                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
5503         } else {
5504                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
5505                 if (acl == NULL)
5506                         goto out;
5507                 acl->cached = 0;
5508         }
5509         acl->len = acl_len;
5510 out:
5511         nfs4_set_cached_acl(inode, acl);
5512 }
5513
5514 /*
5515  * The getxattr API returns the required buffer length when called with a
5516  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
5517  * the required buf.  On a NULL buf, we send a page of data to the server
5518  * guessing that the ACL request can be serviced by a page. If so, we cache
5519  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
5520  * the cache. If not so, we throw away the page, and cache the required
5521  * length. The next getxattr call will then produce another round trip to
5522  * the server, this time with the input buf of the required size.
5523  */
5524 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5525 {
5526         struct page *pages[NFS4ACL_MAXPAGES + 1] = {NULL, };
5527         struct nfs_getaclargs args = {
5528                 .fh = NFS_FH(inode),
5529                 .acl_pages = pages,
5530                 .acl_len = buflen,
5531         };
5532         struct nfs_getaclres res = {
5533                 .acl_len = buflen,
5534         };
5535         struct rpc_message msg = {
5536                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
5537                 .rpc_argp = &args,
5538                 .rpc_resp = &res,
5539         };
5540         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
5541         int ret = -ENOMEM, i;
5542
5543         if (npages > ARRAY_SIZE(pages))
5544                 return -ERANGE;
5545
5546         for (i = 0; i < npages; i++) {
5547                 pages[i] = alloc_page(GFP_KERNEL);
5548                 if (!pages[i])
5549                         goto out_free;
5550         }
5551
5552         /* for decoding across pages */
5553         res.acl_scratch = alloc_page(GFP_KERNEL);
5554         if (!res.acl_scratch)
5555                 goto out_free;
5556
5557         args.acl_len = npages * PAGE_SIZE;
5558
5559         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
5560                 __func__, buf, buflen, npages, args.acl_len);
5561         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
5562                              &msg, &args.seq_args, &res.seq_res, 0);
5563         if (ret)
5564                 goto out_free;
5565
5566         /* Handle the case where the passed-in buffer is too short */
5567         if (res.acl_flags & NFS4_ACL_TRUNC) {
5568                 /* Did the user only issue a request for the acl length? */
5569                 if (buf == NULL)
5570                         goto out_ok;
5571                 ret = -ERANGE;
5572                 goto out_free;
5573         }
5574         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
5575         if (buf) {
5576                 if (res.acl_len > buflen) {
5577                         ret = -ERANGE;
5578                         goto out_free;
5579                 }
5580                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
5581         }
5582 out_ok:
5583         ret = res.acl_len;
5584 out_free:
5585         for (i = 0; i < npages; i++)
5586                 if (pages[i])
5587                         __free_page(pages[i]);
5588         if (res.acl_scratch)
5589                 __free_page(res.acl_scratch);
5590         return ret;
5591 }
5592
5593 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
5594 {
5595         struct nfs4_exception exception = {
5596                 .interruptible = true,
5597         };
5598         ssize_t ret;
5599         do {
5600                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
5601                 trace_nfs4_get_acl(inode, ret);
5602                 if (ret >= 0)
5603                         break;
5604                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
5605         } while (exception.retry);
5606         return ret;
5607 }
5608
5609 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
5610 {
5611         struct nfs_server *server = NFS_SERVER(inode);
5612         int ret;
5613
5614         if (!nfs4_server_supports_acls(server))
5615                 return -EOPNOTSUPP;
5616         ret = nfs_revalidate_inode(server, inode);
5617         if (ret < 0)
5618                 return ret;
5619         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
5620                 nfs_zap_acl_cache(inode);
5621         ret = nfs4_read_cached_acl(inode, buf, buflen);
5622         if (ret != -ENOENT)
5623                 /* -ENOENT is returned if there is no ACL or if there is an ACL
5624                  * but no cached acl data, just the acl length */
5625                 return ret;
5626         return nfs4_get_acl_uncached(inode, buf, buflen);
5627 }
5628
5629 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5630 {
5631         struct nfs_server *server = NFS_SERVER(inode);
5632         struct page *pages[NFS4ACL_MAXPAGES];
5633         struct nfs_setaclargs arg = {
5634                 .fh             = NFS_FH(inode),
5635                 .acl_pages      = pages,
5636                 .acl_len        = buflen,
5637         };
5638         struct nfs_setaclres res;
5639         struct rpc_message msg = {
5640                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
5641                 .rpc_argp       = &arg,
5642                 .rpc_resp       = &res,
5643         };
5644         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
5645         int ret, i;
5646
5647         if (!nfs4_server_supports_acls(server))
5648                 return -EOPNOTSUPP;
5649         if (npages > ARRAY_SIZE(pages))
5650                 return -ERANGE;
5651         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
5652         if (i < 0)
5653                 return i;
5654         nfs4_inode_make_writeable(inode);
5655         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5656
5657         /*
5658          * Free each page after tx, so the only ref left is
5659          * held by the network stack
5660          */
5661         for (; i > 0; i--)
5662                 put_page(pages[i-1]);
5663
5664         /*
5665          * Acl update can result in inode attribute update.
5666          * so mark the attribute cache invalid.
5667          */
5668         spin_lock(&inode->i_lock);
5669         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE
5670                 | NFS_INO_INVALID_CTIME
5671                 | NFS_INO_REVAL_FORCED;
5672         spin_unlock(&inode->i_lock);
5673         nfs_access_zap_cache(inode);
5674         nfs_zap_acl_cache(inode);
5675         return ret;
5676 }
5677
5678 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5679 {
5680         struct nfs4_exception exception = { };
5681         int err;
5682         do {
5683                 err = __nfs4_proc_set_acl(inode, buf, buflen);
5684                 trace_nfs4_set_acl(inode, err);
5685                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5686                                 &exception);
5687         } while (exception.retry);
5688         return err;
5689 }
5690
5691 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5692 static int _nfs4_get_security_label(struct inode *inode, void *buf,
5693                                         size_t buflen)
5694 {
5695         struct nfs_server *server = NFS_SERVER(inode);
5696         struct nfs_fattr fattr;
5697         struct nfs4_label label = {0, 0, buflen, buf};
5698
5699         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5700         struct nfs4_getattr_arg arg = {
5701                 .fh             = NFS_FH(inode),
5702                 .bitmask        = bitmask,
5703         };
5704         struct nfs4_getattr_res res = {
5705                 .fattr          = &fattr,
5706                 .label          = &label,
5707                 .server         = server,
5708         };
5709         struct rpc_message msg = {
5710                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
5711                 .rpc_argp       = &arg,
5712                 .rpc_resp       = &res,
5713         };
5714         int ret;
5715
5716         nfs_fattr_init(&fattr);
5717
5718         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
5719         if (ret)
5720                 return ret;
5721         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
5722                 return -ENOENT;
5723         if (buflen < label.len)
5724                 return -ERANGE;
5725         return 0;
5726 }
5727
5728 static int nfs4_get_security_label(struct inode *inode, void *buf,
5729                                         size_t buflen)
5730 {
5731         struct nfs4_exception exception = {
5732                 .interruptible = true,
5733         };
5734         int err;
5735
5736         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5737                 return -EOPNOTSUPP;
5738
5739         do {
5740                 err = _nfs4_get_security_label(inode, buf, buflen);
5741                 trace_nfs4_get_security_label(inode, err);
5742                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5743                                 &exception);
5744         } while (exception.retry);
5745         return err;
5746 }
5747
5748 static int _nfs4_do_set_security_label(struct inode *inode,
5749                 struct nfs4_label *ilabel,
5750                 struct nfs_fattr *fattr,
5751                 struct nfs4_label *olabel)
5752 {
5753
5754         struct iattr sattr = {0};
5755         struct nfs_server *server = NFS_SERVER(inode);
5756         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5757         struct nfs_setattrargs arg = {
5758                 .fh             = NFS_FH(inode),
5759                 .iap            = &sattr,
5760                 .server         = server,
5761                 .bitmask        = bitmask,
5762                 .label          = ilabel,
5763         };
5764         struct nfs_setattrres res = {
5765                 .fattr          = fattr,
5766                 .label          = olabel,
5767                 .server         = server,
5768         };
5769         struct rpc_message msg = {
5770                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
5771                 .rpc_argp       = &arg,
5772                 .rpc_resp       = &res,
5773         };
5774         int status;
5775
5776         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
5777
5778         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5779         if (status)
5780                 dprintk("%s failed: %d\n", __func__, status);
5781
5782         return status;
5783 }
5784
5785 static int nfs4_do_set_security_label(struct inode *inode,
5786                 struct nfs4_label *ilabel,
5787                 struct nfs_fattr *fattr,
5788                 struct nfs4_label *olabel)
5789 {
5790         struct nfs4_exception exception = { };
5791         int err;
5792
5793         do {
5794                 err = _nfs4_do_set_security_label(inode, ilabel,
5795                                 fattr, olabel);
5796                 trace_nfs4_set_security_label(inode, err);
5797                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5798                                 &exception);
5799         } while (exception.retry);
5800         return err;
5801 }
5802
5803 static int
5804 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
5805 {
5806         struct nfs4_label ilabel, *olabel = NULL;
5807         struct nfs_fattr fattr;
5808         int status;
5809
5810         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5811                 return -EOPNOTSUPP;
5812
5813         nfs_fattr_init(&fattr);
5814
5815         ilabel.pi = 0;
5816         ilabel.lfs = 0;
5817         ilabel.label = (char *)buf;
5818         ilabel.len = buflen;
5819
5820         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5821         if (IS_ERR(olabel)) {
5822                 status = -PTR_ERR(olabel);
5823                 goto out;
5824         }
5825
5826         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5827         if (status == 0)
5828                 nfs_setsecurity(inode, &fattr, olabel);
5829
5830         nfs4_label_free(olabel);
5831 out:
5832         return status;
5833 }
5834 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
5835
5836
5837 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5838                                     nfs4_verifier *bootverf)
5839 {
5840         __be32 verf[2];
5841
5842         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5843                 /* An impossible timestamp guarantees this value
5844                  * will never match a generated boot time. */
5845                 verf[0] = cpu_to_be32(U32_MAX);
5846                 verf[1] = cpu_to_be32(U32_MAX);
5847         } else {
5848                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5849                 u64 ns = ktime_to_ns(nn->boot_time);
5850
5851                 verf[0] = cpu_to_be32(ns >> 32);
5852                 verf[1] = cpu_to_be32(ns);
5853         }
5854         memcpy(bootverf->data, verf, sizeof(bootverf->data));
5855 }
5856
5857 static int
5858 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
5859 {
5860         size_t len;
5861         char *str;
5862
5863         if (clp->cl_owner_id != NULL)
5864                 return 0;
5865
5866         rcu_read_lock();
5867         len = 14 +
5868                 strlen(clp->cl_rpcclient->cl_nodename) +
5869                 1 +
5870                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5871                 1;
5872         rcu_read_unlock();
5873         if (nfs4_client_id_uniquifier[0] != '\0')
5874                 len += strlen(nfs4_client_id_uniquifier) + 1;
5875         if (len > NFS4_OPAQUE_LIMIT + 1)
5876                 return -EINVAL;
5877
5878         /*
5879          * Since this string is allocated at mount time, and held until the
5880          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5881          * about a memory-reclaim deadlock.
5882          */
5883         str = kmalloc(len, GFP_KERNEL);
5884         if (!str)
5885                 return -ENOMEM;
5886
5887         rcu_read_lock();
5888         if (nfs4_client_id_uniquifier[0] != '\0')
5889                 scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
5890                           clp->cl_rpcclient->cl_nodename,
5891                           nfs4_client_id_uniquifier,
5892                           rpc_peeraddr2str(clp->cl_rpcclient,
5893                                            RPC_DISPLAY_ADDR));
5894         else
5895                 scnprintf(str, len, "Linux NFSv4.0 %s/%s",
5896                           clp->cl_rpcclient->cl_nodename,
5897                           rpc_peeraddr2str(clp->cl_rpcclient,
5898                                            RPC_DISPLAY_ADDR));
5899         rcu_read_unlock();
5900
5901         clp->cl_owner_id = str;
5902         return 0;
5903 }
5904
5905 static int
5906 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
5907 {
5908         size_t len;
5909         char *str;
5910
5911         len = 10 + 10 + 1 + 10 + 1 +
5912                 strlen(nfs4_client_id_uniquifier) + 1 +
5913                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5914
5915         if (len > NFS4_OPAQUE_LIMIT + 1)
5916                 return -EINVAL;
5917
5918         /*
5919          * Since this string is allocated at mount time, and held until the
5920          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5921          * about a memory-reclaim deadlock.
5922          */
5923         str = kmalloc(len, GFP_KERNEL);
5924         if (!str)
5925                 return -ENOMEM;
5926
5927         scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
5928                         clp->rpc_ops->version, clp->cl_minorversion,
5929                         nfs4_client_id_uniquifier,
5930                         clp->cl_rpcclient->cl_nodename);
5931         clp->cl_owner_id = str;
5932         return 0;
5933 }
5934
5935 static int
5936 nfs4_init_uniform_client_string(struct nfs_client *clp)
5937 {
5938         size_t len;
5939         char *str;
5940
5941         if (clp->cl_owner_id != NULL)
5942                 return 0;
5943
5944         if (nfs4_client_id_uniquifier[0] != '\0')
5945                 return nfs4_init_uniquifier_client_string(clp);
5946
5947         len = 10 + 10 + 1 + 10 + 1 +
5948                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5949
5950         if (len > NFS4_OPAQUE_LIMIT + 1)
5951                 return -EINVAL;
5952
5953         /*
5954          * Since this string is allocated at mount time, and held until the
5955          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5956          * about a memory-reclaim deadlock.
5957          */
5958         str = kmalloc(len, GFP_KERNEL);
5959         if (!str)
5960                 return -ENOMEM;
5961
5962         scnprintf(str, len, "Linux NFSv%u.%u %s",
5963                         clp->rpc_ops->version, clp->cl_minorversion,
5964                         clp->cl_rpcclient->cl_nodename);
5965         clp->cl_owner_id = str;
5966         return 0;
5967 }
5968
5969 /*
5970  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5971  * services.  Advertise one based on the address family of the
5972  * clientaddr.
5973  */
5974 static unsigned int
5975 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5976 {
5977         if (strchr(clp->cl_ipaddr, ':') != NULL)
5978                 return scnprintf(buf, len, "tcp6");
5979         else
5980                 return scnprintf(buf, len, "tcp");
5981 }
5982
5983 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5984 {
5985         struct nfs4_setclientid *sc = calldata;
5986
5987         if (task->tk_status == 0)
5988                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5989 }
5990
5991 static const struct rpc_call_ops nfs4_setclientid_ops = {
5992         .rpc_call_done = nfs4_setclientid_done,
5993 };
5994
5995 /**
5996  * nfs4_proc_setclientid - Negotiate client ID
5997  * @clp: state data structure
5998  * @program: RPC program for NFSv4 callback service
5999  * @port: IP port number for NFS4 callback service
6000  * @cred: credential to use for this call
6001  * @res: where to place the result
6002  *
6003  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6004  */
6005 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
6006                 unsigned short port, const struct cred *cred,
6007                 struct nfs4_setclientid_res *res)
6008 {
6009         nfs4_verifier sc_verifier;
6010         struct nfs4_setclientid setclientid = {
6011                 .sc_verifier = &sc_verifier,
6012                 .sc_prog = program,
6013                 .sc_clnt = clp,
6014         };
6015         struct rpc_message msg = {
6016                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
6017                 .rpc_argp = &setclientid,
6018                 .rpc_resp = res,
6019                 .rpc_cred = cred,
6020         };
6021         struct rpc_task *task;
6022         struct rpc_task_setup task_setup_data = {
6023                 .rpc_client = clp->cl_rpcclient,
6024                 .rpc_message = &msg,
6025                 .callback_ops = &nfs4_setclientid_ops,
6026                 .callback_data = &setclientid,
6027                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
6028         };
6029         int status;
6030
6031         /* nfs_client_id4 */
6032         nfs4_init_boot_verifier(clp, &sc_verifier);
6033
6034         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
6035                 status = nfs4_init_uniform_client_string(clp);
6036         else
6037                 status = nfs4_init_nonuniform_client_string(clp);
6038
6039         if (status)
6040                 goto out;
6041
6042         /* cb_client4 */
6043         setclientid.sc_netid_len =
6044                                 nfs4_init_callback_netid(clp,
6045                                                 setclientid.sc_netid,
6046                                                 sizeof(setclientid.sc_netid));
6047         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
6048                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
6049                                 clp->cl_ipaddr, port >> 8, port & 255);
6050
6051         dprintk("NFS call  setclientid auth=%s, '%s'\n",
6052                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6053                 clp->cl_owner_id);
6054         task = rpc_run_task(&task_setup_data);
6055         if (IS_ERR(task)) {
6056                 status = PTR_ERR(task);
6057                 goto out;
6058         }
6059         status = task->tk_status;
6060         if (setclientid.sc_cred) {
6061                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
6062                 put_rpccred(setclientid.sc_cred);
6063         }
6064         rpc_put_task(task);
6065 out:
6066         trace_nfs4_setclientid(clp, status);
6067         dprintk("NFS reply setclientid: %d\n", status);
6068         return status;
6069 }
6070
6071 /**
6072  * nfs4_proc_setclientid_confirm - Confirm client ID
6073  * @clp: state data structure
6074  * @arg: result of a previous SETCLIENTID
6075  * @cred: credential to use for this call
6076  *
6077  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6078  */
6079 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
6080                 struct nfs4_setclientid_res *arg,
6081                 const struct cred *cred)
6082 {
6083         struct rpc_message msg = {
6084                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
6085                 .rpc_argp = arg,
6086                 .rpc_cred = cred,
6087         };
6088         int status;
6089
6090         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
6091                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6092                 clp->cl_clientid);
6093         status = rpc_call_sync(clp->cl_rpcclient, &msg,
6094                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
6095         trace_nfs4_setclientid_confirm(clp, status);
6096         dprintk("NFS reply setclientid_confirm: %d\n", status);
6097         return status;
6098 }
6099
6100 struct nfs4_delegreturndata {
6101         struct nfs4_delegreturnargs args;
6102         struct nfs4_delegreturnres res;
6103         struct nfs_fh fh;
6104         nfs4_stateid stateid;
6105         unsigned long timestamp;
6106         struct {
6107                 struct nfs4_layoutreturn_args arg;
6108                 struct nfs4_layoutreturn_res res;
6109                 struct nfs4_xdr_opaque_data ld_private;
6110                 u32 roc_barrier;
6111                 bool roc;
6112         } lr;
6113         struct nfs_fattr fattr;
6114         int rpc_status;
6115         struct inode *inode;
6116 };
6117
6118 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
6119 {
6120         struct nfs4_delegreturndata *data = calldata;
6121         struct nfs4_exception exception = {
6122                 .inode = data->inode,
6123                 .stateid = &data->stateid,
6124         };
6125
6126         if (!nfs4_sequence_done(task, &data->res.seq_res))
6127                 return;
6128
6129         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
6130
6131         /* Handle Layoutreturn errors */
6132         if (data->args.lr_args && task->tk_status != 0) {
6133                 switch(data->res.lr_ret) {
6134                 default:
6135                         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6136                         break;
6137                 case 0:
6138                         data->args.lr_args = NULL;
6139                         data->res.lr_res = NULL;
6140                         break;
6141                 case -NFS4ERR_OLD_STATEID:
6142                         if (nfs4_layoutreturn_refresh_stateid(&data->args.lr_args->stateid,
6143                                                 &data->args.lr_args->range,
6144                                                 data->inode))
6145                                 goto lr_restart;
6146                         /* Fallthrough */
6147                 case -NFS4ERR_ADMIN_REVOKED:
6148                 case -NFS4ERR_DELEG_REVOKED:
6149                 case -NFS4ERR_EXPIRED:
6150                 case -NFS4ERR_BAD_STATEID:
6151                 case -NFS4ERR_UNKNOWN_LAYOUTTYPE:
6152                 case -NFS4ERR_WRONG_CRED:
6153                         data->args.lr_args = NULL;
6154                         data->res.lr_res = NULL;
6155                         goto lr_restart;
6156                 }
6157         }
6158
6159         switch (task->tk_status) {
6160         case 0:
6161                 renew_lease(data->res.server, data->timestamp);
6162                 break;
6163         case -NFS4ERR_ADMIN_REVOKED:
6164         case -NFS4ERR_DELEG_REVOKED:
6165         case -NFS4ERR_EXPIRED:
6166                 nfs4_free_revoked_stateid(data->res.server,
6167                                 data->args.stateid,
6168                                 task->tk_msg.rpc_cred);
6169                 /* Fallthrough */
6170         case -NFS4ERR_BAD_STATEID:
6171         case -NFS4ERR_STALE_STATEID:
6172                 task->tk_status = 0;
6173                 break;
6174         case -NFS4ERR_OLD_STATEID:
6175                 if (nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
6176                         goto out_restart;
6177                 task->tk_status = 0;
6178                 break;
6179         case -NFS4ERR_ACCESS:
6180                 if (data->args.bitmask) {
6181                         data->args.bitmask = NULL;
6182                         data->res.fattr = NULL;
6183                         goto out_restart;
6184                 }
6185                 /* Fallthrough */
6186         default:
6187                 task->tk_status = nfs4_async_handle_exception(task,
6188                                 data->res.server, task->tk_status,
6189                                 &exception);
6190                 if (exception.retry)
6191                         goto out_restart;
6192         }
6193         data->rpc_status = task->tk_status;
6194         return;
6195 lr_restart:
6196         data->res.lr_ret = 0;
6197 out_restart:
6198         task->tk_status = 0;
6199         rpc_restart_call_prepare(task);
6200 }
6201
6202 static void nfs4_delegreturn_release(void *calldata)
6203 {
6204         struct nfs4_delegreturndata *data = calldata;
6205         struct inode *inode = data->inode;
6206
6207         if (inode) {
6208                 if (data->lr.roc)
6209                         pnfs_roc_release(&data->lr.arg, &data->lr.res,
6210                                         data->res.lr_ret);
6211                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
6212                 nfs_iput_and_deactive(inode);
6213         }
6214         kfree(calldata);
6215 }
6216
6217 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
6218 {
6219         struct nfs4_delegreturndata *d_data;
6220         struct pnfs_layout_hdr *lo;
6221
6222         d_data = (struct nfs4_delegreturndata *)data;
6223
6224         if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task))
6225                 return;
6226
6227         lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
6228         if (lo && !pnfs_layout_is_valid(lo)) {
6229                 d_data->args.lr_args = NULL;
6230                 d_data->res.lr_res = NULL;
6231         }
6232
6233         nfs4_setup_sequence(d_data->res.server->nfs_client,
6234                         &d_data->args.seq_args,
6235                         &d_data->res.seq_res,
6236                         task);
6237 }
6238
6239 static const struct rpc_call_ops nfs4_delegreturn_ops = {
6240         .rpc_call_prepare = nfs4_delegreturn_prepare,
6241         .rpc_call_done = nfs4_delegreturn_done,
6242         .rpc_release = nfs4_delegreturn_release,
6243 };
6244
6245 static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6246 {
6247         struct nfs4_delegreturndata *data;
6248         struct nfs_server *server = NFS_SERVER(inode);
6249         struct rpc_task *task;
6250         struct rpc_message msg = {
6251                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
6252                 .rpc_cred = cred,
6253         };
6254         struct rpc_task_setup task_setup_data = {
6255                 .rpc_client = server->client,
6256                 .rpc_message = &msg,
6257                 .callback_ops = &nfs4_delegreturn_ops,
6258                 .flags = RPC_TASK_ASYNC,
6259         };
6260         int status = 0;
6261
6262         data = kzalloc(sizeof(*data), GFP_NOFS);
6263         if (data == NULL)
6264                 return -ENOMEM;
6265         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
6266
6267         nfs4_state_protect(server->nfs_client,
6268                         NFS_SP4_MACH_CRED_CLEANUP,
6269                         &task_setup_data.rpc_client, &msg);
6270
6271         data->args.fhandle = &data->fh;
6272         data->args.stateid = &data->stateid;
6273         data->args.bitmask = server->cache_consistency_bitmask;
6274         nfs_copy_fh(&data->fh, NFS_FH(inode));
6275         nfs4_stateid_copy(&data->stateid, stateid);
6276         data->res.fattr = &data->fattr;
6277         data->res.server = server;
6278         data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
6279         data->lr.arg.ld_private = &data->lr.ld_private;
6280         nfs_fattr_init(data->res.fattr);
6281         data->timestamp = jiffies;
6282         data->rpc_status = 0;
6283         data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res, cred);
6284         data->inode = nfs_igrab_and_active(inode);
6285         if (data->inode) {
6286                 if (data->lr.roc) {
6287                         data->args.lr_args = &data->lr.arg;
6288                         data->res.lr_res = &data->lr.res;
6289                 }
6290         } else if (data->lr.roc) {
6291                 pnfs_roc_release(&data->lr.arg, &data->lr.res, 0);
6292                 data->lr.roc = false;
6293         }
6294
6295         task_setup_data.callback_data = data;
6296         msg.rpc_argp = &data->args;
6297         msg.rpc_resp = &data->res;
6298         task = rpc_run_task(&task_setup_data);
6299         if (IS_ERR(task))
6300                 return PTR_ERR(task);
6301         if (!issync)
6302                 goto out;
6303         status = rpc_wait_for_completion_task(task);
6304         if (status != 0)
6305                 goto out;
6306         status = data->rpc_status;
6307 out:
6308         rpc_put_task(task);
6309         return status;
6310 }
6311
6312 int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
6313 {
6314         struct nfs_server *server = NFS_SERVER(inode);
6315         struct nfs4_exception exception = { };
6316         int err;
6317         do {
6318                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
6319                 trace_nfs4_delegreturn(inode, stateid, err);
6320                 switch (err) {
6321                         case -NFS4ERR_STALE_STATEID:
6322                         case -NFS4ERR_EXPIRED:
6323                         case 0:
6324                                 return 0;
6325                 }
6326                 err = nfs4_handle_exception(server, err, &exception);
6327         } while (exception.retry);
6328         return err;
6329 }
6330
6331 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6332 {
6333         struct inode *inode = state->inode;
6334         struct nfs_server *server = NFS_SERVER(inode);
6335         struct nfs_client *clp = server->nfs_client;
6336         struct nfs_lockt_args arg = {
6337                 .fh = NFS_FH(inode),
6338                 .fl = request,
6339         };
6340         struct nfs_lockt_res res = {
6341                 .denied = request,
6342         };
6343         struct rpc_message msg = {
6344                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
6345                 .rpc_argp       = &arg,
6346                 .rpc_resp       = &res,
6347                 .rpc_cred       = state->owner->so_cred,
6348         };
6349         struct nfs4_lock_state *lsp;
6350         int status;
6351
6352         arg.lock_owner.clientid = clp->cl_clientid;
6353         status = nfs4_set_lock_state(state, request);
6354         if (status != 0)
6355                 goto out;
6356         lsp = request->fl_u.nfs4_fl.owner;
6357         arg.lock_owner.id = lsp->ls_seqid.owner_id;
6358         arg.lock_owner.s_dev = server->s_dev;
6359         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
6360         switch (status) {
6361                 case 0:
6362                         request->fl_type = F_UNLCK;
6363                         break;
6364                 case -NFS4ERR_DENIED:
6365                         status = 0;
6366         }
6367         request->fl_ops->fl_release_private(request);
6368         request->fl_ops = NULL;
6369 out:
6370         return status;
6371 }
6372
6373 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6374 {
6375         struct nfs4_exception exception = {
6376                 .interruptible = true,
6377         };
6378         int err;
6379
6380         do {
6381                 err = _nfs4_proc_getlk(state, cmd, request);
6382                 trace_nfs4_get_lock(request, state, cmd, err);
6383                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
6384                                 &exception);
6385         } while (exception.retry);
6386         return err;
6387 }
6388
6389 struct nfs4_unlockdata {
6390         struct nfs_locku_args arg;
6391         struct nfs_locku_res res;
6392         struct nfs4_lock_state *lsp;
6393         struct nfs_open_context *ctx;
6394         struct nfs_lock_context *l_ctx;
6395         struct file_lock fl;
6396         struct nfs_server *server;
6397         unsigned long timestamp;
6398 };
6399
6400 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
6401                 struct nfs_open_context *ctx,
6402                 struct nfs4_lock_state *lsp,
6403                 struct nfs_seqid *seqid)
6404 {
6405         struct nfs4_unlockdata *p;
6406         struct inode *inode = lsp->ls_state->inode;
6407
6408         p = kzalloc(sizeof(*p), GFP_NOFS);
6409         if (p == NULL)
6410                 return NULL;
6411         p->arg.fh = NFS_FH(inode);
6412         p->arg.fl = &p->fl;
6413         p->arg.seqid = seqid;
6414         p->res.seqid = seqid;
6415         p->lsp = lsp;
6416         /* Ensure we don't close file until we're done freeing locks! */
6417         p->ctx = get_nfs_open_context(ctx);
6418         p->l_ctx = nfs_get_lock_context(ctx);
6419         locks_init_lock(&p->fl);
6420         locks_copy_lock(&p->fl, fl);
6421         p->server = NFS_SERVER(inode);
6422         return p;
6423 }
6424
6425 static void nfs4_locku_release_calldata(void *data)
6426 {
6427         struct nfs4_unlockdata *calldata = data;
6428         nfs_free_seqid(calldata->arg.seqid);
6429         nfs4_put_lock_state(calldata->lsp);
6430         nfs_put_lock_context(calldata->l_ctx);
6431         put_nfs_open_context(calldata->ctx);
6432         kfree(calldata);
6433 }
6434
6435 static void nfs4_locku_done(struct rpc_task *task, void *data)
6436 {
6437         struct nfs4_unlockdata *calldata = data;
6438         struct nfs4_exception exception = {
6439                 .inode = calldata->lsp->ls_state->inode,
6440                 .stateid = &calldata->arg.stateid,
6441         };
6442
6443         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
6444                 return;
6445         switch (task->tk_status) {
6446                 case 0:
6447                         renew_lease(calldata->server, calldata->timestamp);
6448                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
6449                         if (nfs4_update_lock_stateid(calldata->lsp,
6450                                         &calldata->res.stateid))
6451                                 break;
6452                         /* Fall through */
6453                 case -NFS4ERR_ADMIN_REVOKED:
6454                 case -NFS4ERR_EXPIRED:
6455                         nfs4_free_revoked_stateid(calldata->server,
6456                                         &calldata->arg.stateid,
6457                                         task->tk_msg.rpc_cred);
6458                         /* Fall through */
6459                 case -NFS4ERR_BAD_STATEID:
6460                 case -NFS4ERR_OLD_STATEID:
6461                 case -NFS4ERR_STALE_STATEID:
6462                         if (!nfs4_stateid_match(&calldata->arg.stateid,
6463                                                 &calldata->lsp->ls_stateid))
6464                                 rpc_restart_call_prepare(task);
6465                         break;
6466                 default:
6467                         task->tk_status = nfs4_async_handle_exception(task,
6468                                         calldata->server, task->tk_status,
6469                                         &exception);
6470                         if (exception.retry)
6471                                 rpc_restart_call_prepare(task);
6472         }
6473         nfs_release_seqid(calldata->arg.seqid);
6474 }
6475
6476 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
6477 {
6478         struct nfs4_unlockdata *calldata = data;
6479
6480         if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
6481                 nfs_async_iocounter_wait(task, calldata->l_ctx))
6482                 return;
6483
6484         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
6485                 goto out_wait;
6486         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
6487         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
6488                 /* Note: exit _without_ running nfs4_locku_done */
6489                 goto out_no_action;
6490         }
6491         calldata->timestamp = jiffies;
6492         if (nfs4_setup_sequence(calldata->server->nfs_client,
6493                                 &calldata->arg.seq_args,
6494                                 &calldata->res.seq_res,
6495                                 task) != 0)
6496                 nfs_release_seqid(calldata->arg.seqid);
6497         return;
6498 out_no_action:
6499         task->tk_action = NULL;
6500 out_wait:
6501         nfs4_sequence_done(task, &calldata->res.seq_res);
6502 }
6503
6504 static const struct rpc_call_ops nfs4_locku_ops = {
6505         .rpc_call_prepare = nfs4_locku_prepare,
6506         .rpc_call_done = nfs4_locku_done,
6507         .rpc_release = nfs4_locku_release_calldata,
6508 };
6509
6510 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
6511                 struct nfs_open_context *ctx,
6512                 struct nfs4_lock_state *lsp,
6513                 struct nfs_seqid *seqid)
6514 {
6515         struct nfs4_unlockdata *data;
6516         struct rpc_message msg = {
6517                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
6518                 .rpc_cred = ctx->cred,
6519         };
6520         struct rpc_task_setup task_setup_data = {
6521                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
6522                 .rpc_message = &msg,
6523                 .callback_ops = &nfs4_locku_ops,
6524                 .workqueue = nfsiod_workqueue,
6525                 .flags = RPC_TASK_ASYNC,
6526         };
6527
6528         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
6529                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
6530
6531         /* Ensure this is an unlock - when canceling a lock, the
6532          * canceled lock is passed in, and it won't be an unlock.
6533          */
6534         fl->fl_type = F_UNLCK;
6535         if (fl->fl_flags & FL_CLOSE)
6536                 set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
6537
6538         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
6539         if (data == NULL) {
6540                 nfs_free_seqid(seqid);
6541                 return ERR_PTR(-ENOMEM);
6542         }
6543
6544         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
6545         msg.rpc_argp = &data->arg;
6546         msg.rpc_resp = &data->res;
6547         task_setup_data.callback_data = data;
6548         return rpc_run_task(&task_setup_data);
6549 }
6550
6551 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
6552 {
6553         struct inode *inode = state->inode;
6554         struct nfs4_state_owner *sp = state->owner;
6555         struct nfs_inode *nfsi = NFS_I(inode);
6556         struct nfs_seqid *seqid;
6557         struct nfs4_lock_state *lsp;
6558         struct rpc_task *task;
6559         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6560         int status = 0;
6561         unsigned char fl_flags = request->fl_flags;
6562
6563         status = nfs4_set_lock_state(state, request);
6564         /* Unlock _before_ we do the RPC call */
6565         request->fl_flags |= FL_EXISTS;
6566         /* Exclude nfs_delegation_claim_locks() */
6567         mutex_lock(&sp->so_delegreturn_mutex);
6568         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
6569         down_read(&nfsi->rwsem);
6570         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
6571                 up_read(&nfsi->rwsem);
6572                 mutex_unlock(&sp->so_delegreturn_mutex);
6573                 goto out;
6574         }
6575         up_read(&nfsi->rwsem);
6576         mutex_unlock(&sp->so_delegreturn_mutex);
6577         if (status != 0)
6578                 goto out;
6579         /* Is this a delegated lock? */
6580         lsp = request->fl_u.nfs4_fl.owner;
6581         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
6582                 goto out;
6583         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
6584         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
6585         status = -ENOMEM;
6586         if (IS_ERR(seqid))
6587                 goto out;
6588         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
6589         status = PTR_ERR(task);
6590         if (IS_ERR(task))
6591                 goto out;
6592         status = rpc_wait_for_completion_task(task);
6593         rpc_put_task(task);
6594 out:
6595         request->fl_flags = fl_flags;
6596         trace_nfs4_unlock(request, state, F_SETLK, status);
6597         return status;
6598 }
6599
6600 struct nfs4_lockdata {
6601         struct nfs_lock_args arg;
6602         struct nfs_lock_res res;
6603         struct nfs4_lock_state *lsp;
6604         struct nfs_open_context *ctx;
6605         struct file_lock fl;
6606         unsigned long timestamp;
6607         int rpc_status;
6608         int cancelled;
6609         struct nfs_server *server;
6610 };
6611
6612 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
6613                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
6614                 gfp_t gfp_mask)
6615 {
6616         struct nfs4_lockdata *p;
6617         struct inode *inode = lsp->ls_state->inode;
6618         struct nfs_server *server = NFS_SERVER(inode);
6619         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
6620
6621         p = kzalloc(sizeof(*p), gfp_mask);
6622         if (p == NULL)
6623                 return NULL;
6624
6625         p->arg.fh = NFS_FH(inode);
6626         p->arg.fl = &p->fl;
6627         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
6628         if (IS_ERR(p->arg.open_seqid))
6629                 goto out_free;
6630         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
6631         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
6632         if (IS_ERR(p->arg.lock_seqid))
6633                 goto out_free_seqid;
6634         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
6635         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
6636         p->arg.lock_owner.s_dev = server->s_dev;
6637         p->res.lock_seqid = p->arg.lock_seqid;
6638         p->lsp = lsp;
6639         p->server = server;
6640         p->ctx = get_nfs_open_context(ctx);
6641         locks_init_lock(&p->fl);
6642         locks_copy_lock(&p->fl, fl);
6643         return p;
6644 out_free_seqid:
6645         nfs_free_seqid(p->arg.open_seqid);
6646 out_free:
6647         kfree(p);
6648         return NULL;
6649 }
6650
6651 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
6652 {
6653         struct nfs4_lockdata *data = calldata;
6654         struct nfs4_state *state = data->lsp->ls_state;
6655
6656         dprintk("%s: begin!\n", __func__);
6657         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
6658                 goto out_wait;
6659         /* Do we need to do an open_to_lock_owner? */
6660         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
6661                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
6662                         goto out_release_lock_seqid;
6663                 }
6664                 nfs4_stateid_copy(&data->arg.open_stateid,
6665                                 &state->open_stateid);
6666                 data->arg.new_lock_owner = 1;
6667                 data->res.open_seqid = data->arg.open_seqid;
6668         } else {
6669                 data->arg.new_lock_owner = 0;
6670                 nfs4_stateid_copy(&data->arg.lock_stateid,
6671                                 &data->lsp->ls_stateid);
6672         }
6673         if (!nfs4_valid_open_stateid(state)) {
6674                 data->rpc_status = -EBADF;
6675                 task->tk_action = NULL;
6676                 goto out_release_open_seqid;
6677         }
6678         data->timestamp = jiffies;
6679         if (nfs4_setup_sequence(data->server->nfs_client,
6680                                 &data->arg.seq_args,
6681                                 &data->res.seq_res,
6682                                 task) == 0)
6683                 return;
6684 out_release_open_seqid:
6685         nfs_release_seqid(data->arg.open_seqid);
6686 out_release_lock_seqid:
6687         nfs_release_seqid(data->arg.lock_seqid);
6688 out_wait:
6689         nfs4_sequence_done(task, &data->res.seq_res);
6690         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
6691 }
6692
6693 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
6694 {
6695         struct nfs4_lockdata *data = calldata;
6696         struct nfs4_lock_state *lsp = data->lsp;
6697
6698         dprintk("%s: begin!\n", __func__);
6699
6700         if (!nfs4_sequence_done(task, &data->res.seq_res))
6701                 return;
6702
6703         data->rpc_status = task->tk_status;
6704         switch (task->tk_status) {
6705         case 0:
6706                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
6707                                 data->timestamp);
6708                 if (data->arg.new_lock && !data->cancelled) {
6709                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
6710                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
6711                                 goto out_restart;
6712                 }
6713                 if (data->arg.new_lock_owner != 0) {
6714                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
6715                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
6716                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6717                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
6718                         goto out_restart;
6719                 break;
6720         case -NFS4ERR_BAD_STATEID:
6721         case -NFS4ERR_OLD_STATEID:
6722         case -NFS4ERR_STALE_STATEID:
6723         case -NFS4ERR_EXPIRED:
6724                 if (data->arg.new_lock_owner != 0) {
6725                         if (!nfs4_stateid_match(&data->arg.open_stateid,
6726                                                 &lsp->ls_state->open_stateid))
6727                                 goto out_restart;
6728                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
6729                                                 &lsp->ls_stateid))
6730                                 goto out_restart;
6731         }
6732 out_done:
6733         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
6734         return;
6735 out_restart:
6736         if (!data->cancelled)
6737                 rpc_restart_call_prepare(task);
6738         goto out_done;
6739 }
6740
6741 static void nfs4_lock_release(void *calldata)
6742 {
6743         struct nfs4_lockdata *data = calldata;
6744
6745         dprintk("%s: begin!\n", __func__);
6746         nfs_free_seqid(data->arg.open_seqid);
6747         if (data->cancelled && data->rpc_status == 0) {
6748                 struct rpc_task *task;
6749                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
6750                                 data->arg.lock_seqid);
6751                 if (!IS_ERR(task))
6752                         rpc_put_task_async(task);
6753                 dprintk("%s: cancelling lock!\n", __func__);
6754         } else
6755                 nfs_free_seqid(data->arg.lock_seqid);
6756         nfs4_put_lock_state(data->lsp);
6757         put_nfs_open_context(data->ctx);
6758         kfree(data);
6759         dprintk("%s: done!\n", __func__);
6760 }
6761
6762 static const struct rpc_call_ops nfs4_lock_ops = {
6763         .rpc_call_prepare = nfs4_lock_prepare,
6764         .rpc_call_done = nfs4_lock_done,
6765         .rpc_release = nfs4_lock_release,
6766 };
6767
6768 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
6769 {
6770         switch (error) {
6771         case -NFS4ERR_ADMIN_REVOKED:
6772         case -NFS4ERR_EXPIRED:
6773         case -NFS4ERR_BAD_STATEID:
6774                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6775                 if (new_lock_owner != 0 ||
6776                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
6777                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
6778                 break;
6779         case -NFS4ERR_STALE_STATEID:
6780                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6781                 nfs4_schedule_lease_recovery(server->nfs_client);
6782         };
6783 }
6784
6785 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
6786 {
6787         struct nfs4_lockdata *data;
6788         struct rpc_task *task;
6789         struct rpc_message msg = {
6790                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
6791                 .rpc_cred = state->owner->so_cred,
6792         };
6793         struct rpc_task_setup task_setup_data = {
6794                 .rpc_client = NFS_CLIENT(state->inode),
6795                 .rpc_message = &msg,
6796                 .callback_ops = &nfs4_lock_ops,
6797                 .workqueue = nfsiod_workqueue,
6798                 .flags = RPC_TASK_ASYNC,
6799         };
6800         int ret;
6801
6802         dprintk("%s: begin!\n", __func__);
6803         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
6804                         fl->fl_u.nfs4_fl.owner,
6805                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
6806         if (data == NULL)
6807                 return -ENOMEM;
6808         if (IS_SETLKW(cmd))
6809                 data->arg.block = 1;
6810         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
6811                                 recovery_type > NFS_LOCK_NEW);
6812         msg.rpc_argp = &data->arg;
6813         msg.rpc_resp = &data->res;
6814         task_setup_data.callback_data = data;
6815         if (recovery_type > NFS_LOCK_NEW) {
6816                 if (recovery_type == NFS_LOCK_RECLAIM)
6817                         data->arg.reclaim = NFS_LOCK_RECLAIM;
6818         } else
6819                 data->arg.new_lock = 1;
6820         task = rpc_run_task(&task_setup_data);
6821         if (IS_ERR(task))
6822                 return PTR_ERR(task);
6823         ret = rpc_wait_for_completion_task(task);
6824         if (ret == 0) {
6825                 ret = data->rpc_status;
6826                 if (ret)
6827                         nfs4_handle_setlk_error(data->server, data->lsp,
6828                                         data->arg.new_lock_owner, ret);
6829         } else
6830                 data->cancelled = true;
6831         rpc_put_task(task);
6832         dprintk("%s: done, ret = %d!\n", __func__, ret);
6833         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
6834         return ret;
6835 }
6836
6837 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
6838 {
6839         struct nfs_server *server = NFS_SERVER(state->inode);
6840         struct nfs4_exception exception = {
6841                 .inode = state->inode,
6842         };
6843         int err;
6844
6845         do {
6846                 /* Cache the lock if possible... */
6847                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6848                         return 0;
6849                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
6850                 if (err != -NFS4ERR_DELAY)
6851                         break;
6852                 nfs4_handle_exception(server, err, &exception);
6853         } while (exception.retry);
6854         return err;
6855 }
6856
6857 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
6858 {
6859         struct nfs_server *server = NFS_SERVER(state->inode);
6860         struct nfs4_exception exception = {
6861                 .inode = state->inode,
6862         };
6863         int err;
6864
6865         err = nfs4_set_lock_state(state, request);
6866         if (err != 0)
6867                 return err;
6868         if (!recover_lost_locks) {
6869                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
6870                 return 0;
6871         }
6872         do {
6873                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6874                         return 0;
6875                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
6876                 switch (err) {
6877                 default:
6878                         goto out;
6879                 case -NFS4ERR_GRACE:
6880                 case -NFS4ERR_DELAY:
6881                         nfs4_handle_exception(server, err, &exception);
6882                         err = 0;
6883                 }
6884         } while (exception.retry);
6885 out:
6886         return err;
6887 }
6888
6889 #if defined(CONFIG_NFS_V4_1)
6890 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
6891 {
6892         struct nfs4_lock_state *lsp;
6893         int status;
6894
6895         status = nfs4_set_lock_state(state, request);
6896         if (status != 0)
6897                 return status;
6898         lsp = request->fl_u.nfs4_fl.owner;
6899         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
6900             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
6901                 return 0;
6902         return nfs4_lock_expired(state, request);
6903 }
6904 #endif
6905
6906 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6907 {
6908         struct nfs_inode *nfsi = NFS_I(state->inode);
6909         struct nfs4_state_owner *sp = state->owner;
6910         unsigned char fl_flags = request->fl_flags;
6911         int status;
6912
6913         request->fl_flags |= FL_ACCESS;
6914         status = locks_lock_inode_wait(state->inode, request);
6915         if (status < 0)
6916                 goto out;
6917         mutex_lock(&sp->so_delegreturn_mutex);
6918         down_read(&nfsi->rwsem);
6919         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
6920                 /* Yes: cache locks! */
6921                 /* ...but avoid races with delegation recall... */
6922                 request->fl_flags = fl_flags & ~FL_SLEEP;
6923                 status = locks_lock_inode_wait(state->inode, request);
6924                 up_read(&nfsi->rwsem);
6925                 mutex_unlock(&sp->so_delegreturn_mutex);
6926                 goto out;
6927         }
6928         up_read(&nfsi->rwsem);
6929         mutex_unlock(&sp->so_delegreturn_mutex);
6930         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
6931 out:
6932         request->fl_flags = fl_flags;
6933         return status;
6934 }
6935
6936 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6937 {
6938         struct nfs4_exception exception = {
6939                 .state = state,
6940                 .inode = state->inode,
6941                 .interruptible = true,
6942         };
6943         int err;
6944
6945         do {
6946                 err = _nfs4_proc_setlk(state, cmd, request);
6947                 if (err == -NFS4ERR_DENIED)
6948                         err = -EAGAIN;
6949                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
6950                                 err, &exception);
6951         } while (exception.retry);
6952         return err;
6953 }
6954
6955 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
6956 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
6957
6958 static int
6959 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
6960                         struct file_lock *request)
6961 {
6962         int             status = -ERESTARTSYS;
6963         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
6964
6965         while(!signalled()) {
6966                 status = nfs4_proc_setlk(state, cmd, request);
6967                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6968                         break;
6969                 freezable_schedule_timeout_interruptible(timeout);
6970                 timeout *= 2;
6971                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
6972                 status = -ERESTARTSYS;
6973         }
6974         return status;
6975 }
6976
6977 #ifdef CONFIG_NFS_V4_1
6978 struct nfs4_lock_waiter {
6979         struct task_struct      *task;
6980         struct inode            *inode;
6981         struct nfs_lowner       *owner;
6982 };
6983
6984 static int
6985 nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
6986 {
6987         int ret;
6988         struct nfs4_lock_waiter *waiter = wait->private;
6989
6990         /* NULL key means to wake up everyone */
6991         if (key) {
6992                 struct cb_notify_lock_args      *cbnl = key;
6993                 struct nfs_lowner               *lowner = &cbnl->cbnl_owner,
6994                                                 *wowner = waiter->owner;
6995
6996                 /* Only wake if the callback was for the same owner. */
6997                 if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
6998                         return 0;
6999
7000                 /* Make sure it's for the right inode */
7001                 if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
7002                         return 0;
7003         }
7004
7005         /* override "private" so we can use default_wake_function */
7006         wait->private = waiter->task;
7007         ret = woken_wake_function(wait, mode, flags, key);
7008         if (ret)
7009                 list_del_init(&wait->entry);
7010         wait->private = waiter;
7011         return ret;
7012 }
7013
7014 static int
7015 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7016 {
7017         int status = -ERESTARTSYS;
7018         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
7019         struct nfs_server *server = NFS_SERVER(state->inode);
7020         struct nfs_client *clp = server->nfs_client;
7021         wait_queue_head_t *q = &clp->cl_lock_waitq;
7022         struct nfs_lowner owner = { .clientid = clp->cl_clientid,
7023                                     .id = lsp->ls_seqid.owner_id,
7024                                     .s_dev = server->s_dev };
7025         struct nfs4_lock_waiter waiter = { .task  = current,
7026                                            .inode = state->inode,
7027                                            .owner = &owner};
7028         wait_queue_entry_t wait;
7029
7030         /* Don't bother with waitqueue if we don't expect a callback */
7031         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
7032                 return nfs4_retry_setlk_simple(state, cmd, request);
7033
7034         init_wait(&wait);
7035         wait.private = &waiter;
7036         wait.func = nfs4_wake_lock_waiter;
7037
7038         while(!signalled()) {
7039                 add_wait_queue(q, &wait);
7040                 status = nfs4_proc_setlk(state, cmd, request);
7041                 if ((status != -EAGAIN) || IS_SETLK(cmd)) {
7042                         finish_wait(q, &wait);
7043                         break;
7044                 }
7045
7046                 status = -ERESTARTSYS;
7047                 freezer_do_not_count();
7048                 wait_woken(&wait, TASK_INTERRUPTIBLE, NFS4_LOCK_MAXTIMEOUT);
7049                 freezer_count();
7050                 finish_wait(q, &wait);
7051         }
7052
7053         return status;
7054 }
7055 #else /* !CONFIG_NFS_V4_1 */
7056 static inline int
7057 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
7058 {
7059         return nfs4_retry_setlk_simple(state, cmd, request);
7060 }
7061 #endif
7062
7063 static int
7064 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
7065 {
7066         struct nfs_open_context *ctx;
7067         struct nfs4_state *state;
7068         int status;
7069
7070         /* verify open state */
7071         ctx = nfs_file_open_context(filp);
7072         state = ctx->state;
7073
7074         if (IS_GETLK(cmd)) {
7075                 if (state != NULL)
7076                         return nfs4_proc_getlk(state, F_GETLK, request);
7077                 return 0;
7078         }
7079
7080         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
7081                 return -EINVAL;
7082
7083         if (request->fl_type == F_UNLCK) {
7084                 if (state != NULL)
7085                         return nfs4_proc_unlck(state, cmd, request);
7086                 return 0;
7087         }
7088
7089         if (state == NULL)
7090                 return -ENOLCK;
7091
7092         if ((request->fl_flags & FL_POSIX) &&
7093             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
7094                 return -ENOLCK;
7095
7096         /*
7097          * Don't rely on the VFS having checked the file open mode,
7098          * since it won't do this for flock() locks.
7099          */
7100         switch (request->fl_type) {
7101         case F_RDLCK:
7102                 if (!(filp->f_mode & FMODE_READ))
7103                         return -EBADF;
7104                 break;
7105         case F_WRLCK:
7106                 if (!(filp->f_mode & FMODE_WRITE))
7107                         return -EBADF;
7108         }
7109
7110         status = nfs4_set_lock_state(state, request);
7111         if (status != 0)
7112                 return status;
7113
7114         return nfs4_retry_setlk(state, cmd, request);
7115 }
7116
7117 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
7118 {
7119         struct nfs_server *server = NFS_SERVER(state->inode);
7120         int err;
7121
7122         err = nfs4_set_lock_state(state, fl);
7123         if (err != 0)
7124                 return err;
7125         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
7126         return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
7127 }
7128
7129 struct nfs_release_lockowner_data {
7130         struct nfs4_lock_state *lsp;
7131         struct nfs_server *server;
7132         struct nfs_release_lockowner_args args;
7133         struct nfs_release_lockowner_res res;
7134         unsigned long timestamp;
7135 };
7136
7137 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
7138 {
7139         struct nfs_release_lockowner_data *data = calldata;
7140         struct nfs_server *server = data->server;
7141         nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
7142                            &data->res.seq_res, task);
7143         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7144         data->timestamp = jiffies;
7145 }
7146
7147 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
7148 {
7149         struct nfs_release_lockowner_data *data = calldata;
7150         struct nfs_server *server = data->server;
7151
7152         nfs40_sequence_done(task, &data->res.seq_res);
7153
7154         switch (task->tk_status) {
7155         case 0:
7156                 renew_lease(server, data->timestamp);
7157                 break;
7158         case -NFS4ERR_STALE_CLIENTID:
7159         case -NFS4ERR_EXPIRED:
7160                 nfs4_schedule_lease_recovery(server->nfs_client);
7161                 break;
7162         case -NFS4ERR_LEASE_MOVED:
7163         case -NFS4ERR_DELAY:
7164                 if (nfs4_async_handle_error(task, server,
7165                                             NULL, NULL) == -EAGAIN)
7166                         rpc_restart_call_prepare(task);
7167         }
7168 }
7169
7170 static void nfs4_release_lockowner_release(void *calldata)
7171 {
7172         struct nfs_release_lockowner_data *data = calldata;
7173         nfs4_free_lock_state(data->server, data->lsp);
7174         kfree(calldata);
7175 }
7176
7177 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
7178         .rpc_call_prepare = nfs4_release_lockowner_prepare,
7179         .rpc_call_done = nfs4_release_lockowner_done,
7180         .rpc_release = nfs4_release_lockowner_release,
7181 };
7182
7183 static void
7184 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
7185 {
7186         struct nfs_release_lockowner_data *data;
7187         struct rpc_message msg = {
7188                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
7189         };
7190
7191         if (server->nfs_client->cl_mvops->minor_version != 0)
7192                 return;
7193
7194         data = kmalloc(sizeof(*data), GFP_NOFS);
7195         if (!data)
7196                 return;
7197         data->lsp = lsp;
7198         data->server = server;
7199         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
7200         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
7201         data->args.lock_owner.s_dev = server->s_dev;
7202
7203         msg.rpc_argp = &data->args;
7204         msg.rpc_resp = &data->res;
7205         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
7206         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
7207 }
7208
7209 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
7210
7211 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
7212                                    struct dentry *unused, struct inode *inode,
7213                                    const char *key, const void *buf,
7214                                    size_t buflen, int flags)
7215 {
7216         return nfs4_proc_set_acl(inode, buf, buflen);
7217 }
7218
7219 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
7220                                    struct dentry *unused, struct inode *inode,
7221                                    const char *key, void *buf, size_t buflen)
7222 {
7223         return nfs4_proc_get_acl(inode, buf, buflen);
7224 }
7225
7226 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
7227 {
7228         return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
7229 }
7230
7231 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
7232
7233 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
7234                                      struct dentry *unused, struct inode *inode,
7235                                      const char *key, const void *buf,
7236                                      size_t buflen, int flags)
7237 {
7238         if (security_ismaclabel(key))
7239                 return nfs4_set_security_label(inode, buf, buflen);
7240
7241         return -EOPNOTSUPP;
7242 }
7243
7244 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
7245                                      struct dentry *unused, struct inode *inode,
7246                                      const char *key, void *buf, size_t buflen)
7247 {
7248         if (security_ismaclabel(key))
7249                 return nfs4_get_security_label(inode, buf, buflen);
7250         return -EOPNOTSUPP;
7251 }
7252
7253 static ssize_t
7254 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7255 {
7256         int len = 0;
7257
7258         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
7259                 len = security_inode_listsecurity(inode, list, list_len);
7260                 if (list_len && len > list_len)
7261                         return -ERANGE;
7262         }
7263         return len;
7264 }
7265
7266 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
7267         .prefix = XATTR_SECURITY_PREFIX,
7268         .get    = nfs4_xattr_get_nfs4_label,
7269         .set    = nfs4_xattr_set_nfs4_label,
7270 };
7271
7272 #else
7273
7274 static ssize_t
7275 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
7276 {
7277         return 0;
7278 }
7279
7280 #endif
7281
7282 /*
7283  * nfs_fhget will use either the mounted_on_fileid or the fileid
7284  */
7285 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
7286 {
7287         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
7288                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
7289               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
7290               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
7291                 return;
7292
7293         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
7294                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
7295         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
7296         fattr->nlink = 2;
7297 }
7298
7299 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7300                                    const struct qstr *name,
7301                                    struct nfs4_fs_locations *fs_locations,
7302                                    struct page *page)
7303 {
7304         struct nfs_server *server = NFS_SERVER(dir);
7305         u32 bitmask[3];
7306         struct nfs4_fs_locations_arg args = {
7307                 .dir_fh = NFS_FH(dir),
7308                 .name = name,
7309                 .page = page,
7310                 .bitmask = bitmask,
7311         };
7312         struct nfs4_fs_locations_res res = {
7313                 .fs_locations = fs_locations,
7314         };
7315         struct rpc_message msg = {
7316                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7317                 .rpc_argp = &args,
7318                 .rpc_resp = &res,
7319         };
7320         int status;
7321
7322         dprintk("%s: start\n", __func__);
7323
7324         bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
7325         bitmask[1] = nfs4_fattr_bitmap[1];
7326
7327         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
7328          * is not supported */
7329         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
7330                 bitmask[0] &= ~FATTR4_WORD0_FILEID;
7331         else
7332                 bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
7333
7334         nfs_fattr_init(&fs_locations->fattr);
7335         fs_locations->server = server;
7336         fs_locations->nlocations = 0;
7337         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
7338         dprintk("%s: returned status = %d\n", __func__, status);
7339         return status;
7340 }
7341
7342 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
7343                            const struct qstr *name,
7344                            struct nfs4_fs_locations *fs_locations,
7345                            struct page *page)
7346 {
7347         struct nfs4_exception exception = {
7348                 .interruptible = true,
7349         };
7350         int err;
7351         do {
7352                 err = _nfs4_proc_fs_locations(client, dir, name,
7353                                 fs_locations, page);
7354                 trace_nfs4_get_fs_locations(dir, name, err);
7355                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
7356                                 &exception);
7357         } while (exception.retry);
7358         return err;
7359 }
7360
7361 /*
7362  * This operation also signals the server that this client is
7363  * performing migration recovery.  The server can stop returning
7364  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
7365  * appended to this compound to identify the client ID which is
7366  * performing recovery.
7367  */
7368 static int _nfs40_proc_get_locations(struct inode *inode,
7369                                      struct nfs4_fs_locations *locations,
7370                                      struct page *page, const struct cred *cred)
7371 {
7372         struct nfs_server *server = NFS_SERVER(inode);
7373         struct rpc_clnt *clnt = server->client;
7374         u32 bitmask[2] = {
7375                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7376         };
7377         struct nfs4_fs_locations_arg args = {
7378                 .clientid       = server->nfs_client->cl_clientid,
7379                 .fh             = NFS_FH(inode),
7380                 .page           = page,
7381                 .bitmask        = bitmask,
7382                 .migration      = 1,            /* skip LOOKUP */
7383                 .renew          = 1,            /* append RENEW */
7384         };
7385         struct nfs4_fs_locations_res res = {
7386                 .fs_locations   = locations,
7387                 .migration      = 1,
7388                 .renew          = 1,
7389         };
7390         struct rpc_message msg = {
7391                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7392                 .rpc_argp       = &args,
7393                 .rpc_resp       = &res,
7394                 .rpc_cred       = cred,
7395         };
7396         unsigned long now = jiffies;
7397         int status;
7398
7399         nfs_fattr_init(&locations->fattr);
7400         locations->server = server;
7401         locations->nlocations = 0;
7402
7403         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7404         status = nfs4_call_sync_sequence(clnt, server, &msg,
7405                                         &args.seq_args, &res.seq_res);
7406         if (status)
7407                 return status;
7408
7409         renew_lease(server, now);
7410         return 0;
7411 }
7412
7413 #ifdef CONFIG_NFS_V4_1
7414
7415 /*
7416  * This operation also signals the server that this client is
7417  * performing migration recovery.  The server can stop asserting
7418  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
7419  * performing this operation is identified in the SEQUENCE
7420  * operation in this compound.
7421  *
7422  * When the client supports GETATTR(fs_locations_info), it can
7423  * be plumbed in here.
7424  */
7425 static int _nfs41_proc_get_locations(struct inode *inode,
7426                                      struct nfs4_fs_locations *locations,
7427                                      struct page *page, const struct cred *cred)
7428 {
7429         struct nfs_server *server = NFS_SERVER(inode);
7430         struct rpc_clnt *clnt = server->client;
7431         u32 bitmask[2] = {
7432                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
7433         };
7434         struct nfs4_fs_locations_arg args = {
7435                 .fh             = NFS_FH(inode),
7436                 .page           = page,
7437                 .bitmask        = bitmask,
7438                 .migration      = 1,            /* skip LOOKUP */
7439         };
7440         struct nfs4_fs_locations_res res = {
7441                 .fs_locations   = locations,
7442                 .migration      = 1,
7443         };
7444         struct rpc_message msg = {
7445                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
7446                 .rpc_argp       = &args,
7447                 .rpc_resp       = &res,
7448                 .rpc_cred       = cred,
7449         };
7450         int status;
7451
7452         nfs_fattr_init(&locations->fattr);
7453         locations->server = server;
7454         locations->nlocations = 0;
7455
7456         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7457         status = nfs4_call_sync_sequence(clnt, server, &msg,
7458                                         &args.seq_args, &res.seq_res);
7459         if (status == NFS4_OK &&
7460             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
7461                 status = -NFS4ERR_LEASE_MOVED;
7462         return status;
7463 }
7464
7465 #endif  /* CONFIG_NFS_V4_1 */
7466
7467 /**
7468  * nfs4_proc_get_locations - discover locations for a migrated FSID
7469  * @inode: inode on FSID that is migrating
7470  * @locations: result of query
7471  * @page: buffer
7472  * @cred: credential to use for this operation
7473  *
7474  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
7475  * operation failed, or a negative errno if a local error occurred.
7476  *
7477  * On success, "locations" is filled in, but if the server has
7478  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
7479  * asserted.
7480  *
7481  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
7482  * from this client that require migration recovery.
7483  */
7484 int nfs4_proc_get_locations(struct inode *inode,
7485                             struct nfs4_fs_locations *locations,
7486                             struct page *page, const struct cred *cred)
7487 {
7488         struct nfs_server *server = NFS_SERVER(inode);
7489         struct nfs_client *clp = server->nfs_client;
7490         const struct nfs4_mig_recovery_ops *ops =
7491                                         clp->cl_mvops->mig_recovery_ops;
7492         struct nfs4_exception exception = {
7493                 .interruptible = true,
7494         };
7495         int status;
7496
7497         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7498                 (unsigned long long)server->fsid.major,
7499                 (unsigned long long)server->fsid.minor,
7500                 clp->cl_hostname);
7501         nfs_display_fhandle(NFS_FH(inode), __func__);
7502
7503         do {
7504                 status = ops->get_locations(inode, locations, page, cred);
7505                 if (status != -NFS4ERR_DELAY)
7506                         break;
7507                 nfs4_handle_exception(server, status, &exception);
7508         } while (exception.retry);
7509         return status;
7510 }
7511
7512 /*
7513  * This operation also signals the server that this client is
7514  * performing "lease moved" recovery.  The server can stop
7515  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
7516  * is appended to this compound to identify the client ID which is
7517  * performing recovery.
7518  */
7519 static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
7520 {
7521         struct nfs_server *server = NFS_SERVER(inode);
7522         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
7523         struct rpc_clnt *clnt = server->client;
7524         struct nfs4_fsid_present_arg args = {
7525                 .fh             = NFS_FH(inode),
7526                 .clientid       = clp->cl_clientid,
7527                 .renew          = 1,            /* append RENEW */
7528         };
7529         struct nfs4_fsid_present_res res = {
7530                 .renew          = 1,
7531         };
7532         struct rpc_message msg = {
7533                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7534                 .rpc_argp       = &args,
7535                 .rpc_resp       = &res,
7536                 .rpc_cred       = cred,
7537         };
7538         unsigned long now = jiffies;
7539         int status;
7540
7541         res.fh = nfs_alloc_fhandle();
7542         if (res.fh == NULL)
7543                 return -ENOMEM;
7544
7545         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7546         status = nfs4_call_sync_sequence(clnt, server, &msg,
7547                                                 &args.seq_args, &res.seq_res);
7548         nfs_free_fhandle(res.fh);
7549         if (status)
7550                 return status;
7551
7552         do_renew_lease(clp, now);
7553         return 0;
7554 }
7555
7556 #ifdef CONFIG_NFS_V4_1
7557
7558 /*
7559  * This operation also signals the server that this client is
7560  * performing "lease moved" recovery.  The server can stop asserting
7561  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
7562  * this operation is identified in the SEQUENCE operation in this
7563  * compound.
7564  */
7565 static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
7566 {
7567         struct nfs_server *server = NFS_SERVER(inode);
7568         struct rpc_clnt *clnt = server->client;
7569         struct nfs4_fsid_present_arg args = {
7570                 .fh             = NFS_FH(inode),
7571         };
7572         struct nfs4_fsid_present_res res = {
7573         };
7574         struct rpc_message msg = {
7575                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
7576                 .rpc_argp       = &args,
7577                 .rpc_resp       = &res,
7578                 .rpc_cred       = cred,
7579         };
7580         int status;
7581
7582         res.fh = nfs_alloc_fhandle();
7583         if (res.fh == NULL)
7584                 return -ENOMEM;
7585
7586         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
7587         status = nfs4_call_sync_sequence(clnt, server, &msg,
7588                                                 &args.seq_args, &res.seq_res);
7589         nfs_free_fhandle(res.fh);
7590         if (status == NFS4_OK &&
7591             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
7592                 status = -NFS4ERR_LEASE_MOVED;
7593         return status;
7594 }
7595
7596 #endif  /* CONFIG_NFS_V4_1 */
7597
7598 /**
7599  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
7600  * @inode: inode on FSID to check
7601  * @cred: credential to use for this operation
7602  *
7603  * Server indicates whether the FSID is present, moved, or not
7604  * recognized.  This operation is necessary to clear a LEASE_MOVED
7605  * condition for this client ID.
7606  *
7607  * Returns NFS4_OK if the FSID is present on this server,
7608  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
7609  *  NFS4ERR code if some error occurred on the server, or a
7610  *  negative errno if a local failure occurred.
7611  */
7612 int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
7613 {
7614         struct nfs_server *server = NFS_SERVER(inode);
7615         struct nfs_client *clp = server->nfs_client;
7616         const struct nfs4_mig_recovery_ops *ops =
7617                                         clp->cl_mvops->mig_recovery_ops;
7618         struct nfs4_exception exception = {
7619                 .interruptible = true,
7620         };
7621         int status;
7622
7623         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
7624                 (unsigned long long)server->fsid.major,
7625                 (unsigned long long)server->fsid.minor,
7626                 clp->cl_hostname);
7627         nfs_display_fhandle(NFS_FH(inode), __func__);
7628
7629         do {
7630                 status = ops->fsid_present(inode, cred);
7631                 if (status != -NFS4ERR_DELAY)
7632                         break;
7633                 nfs4_handle_exception(server, status, &exception);
7634         } while (exception.retry);
7635         return status;
7636 }
7637
7638 /*
7639  * If 'use_integrity' is true and the state managment nfs_client
7640  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
7641  * and the machine credential as per RFC3530bis and RFC5661 Security
7642  * Considerations sections. Otherwise, just use the user cred with the
7643  * filesystem's rpc_client.
7644  */
7645 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
7646 {
7647         int status;
7648         struct nfs4_secinfo_arg args = {
7649                 .dir_fh = NFS_FH(dir),
7650                 .name   = name,
7651         };
7652         struct nfs4_secinfo_res res = {
7653                 .flavors     = flavors,
7654         };
7655         struct rpc_message msg = {
7656                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
7657                 .rpc_argp = &args,
7658                 .rpc_resp = &res,
7659         };
7660         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
7661         const struct cred *cred = NULL;
7662
7663         if (use_integrity) {
7664                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
7665                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
7666                 msg.rpc_cred = cred;
7667         }
7668
7669         dprintk("NFS call  secinfo %s\n", name->name);
7670
7671         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
7672                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
7673
7674         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
7675                                 &res.seq_res, RPC_TASK_NO_ROUND_ROBIN);
7676         dprintk("NFS reply  secinfo: %d\n", status);
7677
7678         put_cred(cred);
7679
7680         return status;
7681 }
7682
7683 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
7684                       struct nfs4_secinfo_flavors *flavors)
7685 {
7686         struct nfs4_exception exception = {
7687                 .interruptible = true,
7688         };
7689         int err;
7690         do {
7691                 err = -NFS4ERR_WRONGSEC;
7692
7693                 /* try to use integrity protection with machine cred */
7694                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
7695                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
7696
7697                 /*
7698                  * if unable to use integrity protection, or SECINFO with
7699                  * integrity protection returns NFS4ERR_WRONGSEC (which is
7700                  * disallowed by spec, but exists in deployed servers) use
7701                  * the current filesystem's rpc_client and the user cred.
7702                  */
7703                 if (err == -NFS4ERR_WRONGSEC)
7704                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
7705
7706                 trace_nfs4_secinfo(dir, name, err);
7707                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
7708                                 &exception);
7709         } while (exception.retry);
7710         return err;
7711 }
7712
7713 #ifdef CONFIG_NFS_V4_1
7714 /*
7715  * Check the exchange flags returned by the server for invalid flags, having
7716  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
7717  * DS flags set.
7718  */
7719 static int nfs4_check_cl_exchange_flags(u32 flags)
7720 {
7721         if (flags & ~EXCHGID4_FLAG_MASK_R)
7722                 goto out_inval;
7723         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
7724             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
7725                 goto out_inval;
7726         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
7727                 goto out_inval;
7728         return NFS_OK;
7729 out_inval:
7730         return -NFS4ERR_INVAL;
7731 }
7732
7733 static bool
7734 nfs41_same_server_scope(struct nfs41_server_scope *a,
7735                         struct nfs41_server_scope *b)
7736 {
7737         if (a->server_scope_sz != b->server_scope_sz)
7738                 return false;
7739         return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
7740 }
7741
7742 static void
7743 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
7744 {
7745 }
7746
7747 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
7748         .rpc_call_done =  &nfs4_bind_one_conn_to_session_done,
7749 };
7750
7751 /*
7752  * nfs4_proc_bind_one_conn_to_session()
7753  *
7754  * The 4.1 client currently uses the same TCP connection for the
7755  * fore and backchannel.
7756  */
7757 static
7758 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
7759                 struct rpc_xprt *xprt,
7760                 struct nfs_client *clp,
7761                 const struct cred *cred)
7762 {
7763         int status;
7764         struct nfs41_bind_conn_to_session_args args = {
7765                 .client = clp,
7766                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
7767         };
7768         struct nfs41_bind_conn_to_session_res res;
7769         struct rpc_message msg = {
7770                 .rpc_proc =
7771                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
7772                 .rpc_argp = &args,
7773                 .rpc_resp = &res,
7774                 .rpc_cred = cred,
7775         };
7776         struct rpc_task_setup task_setup_data = {
7777                 .rpc_client = clnt,
7778                 .rpc_xprt = xprt,
7779                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
7780                 .rpc_message = &msg,
7781                 .flags = RPC_TASK_TIMEOUT,
7782         };
7783         struct rpc_task *task;
7784
7785         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
7786         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
7787                 args.dir = NFS4_CDFC4_FORE;
7788
7789         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
7790         if (xprt != rcu_access_pointer(clnt->cl_xprt))
7791                 args.dir = NFS4_CDFC4_FORE;
7792
7793         task = rpc_run_task(&task_setup_data);
7794         if (!IS_ERR(task)) {
7795                 status = task->tk_status;
7796                 rpc_put_task(task);
7797         } else
7798                 status = PTR_ERR(task);
7799         trace_nfs4_bind_conn_to_session(clp, status);
7800         if (status == 0) {
7801                 if (memcmp(res.sessionid.data,
7802                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
7803                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
7804                         return -EIO;
7805                 }
7806                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
7807                         dprintk("NFS: %s: Unexpected direction from server\n",
7808                                 __func__);
7809                         return -EIO;
7810                 }
7811                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
7812                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
7813                                 __func__);
7814                         return -EIO;
7815                 }
7816         }
7817
7818         return status;
7819 }
7820
7821 struct rpc_bind_conn_calldata {
7822         struct nfs_client *clp;
7823         const struct cred *cred;
7824 };
7825
7826 static int
7827 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
7828                 struct rpc_xprt *xprt,
7829                 void *calldata)
7830 {
7831         struct rpc_bind_conn_calldata *p = calldata;
7832
7833         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
7834 }
7835
7836 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
7837 {
7838         struct rpc_bind_conn_calldata data = {
7839                 .clp = clp,
7840                 .cred = cred,
7841         };
7842         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
7843                         nfs4_proc_bind_conn_to_session_callback, &data);
7844 }
7845
7846 /*
7847  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
7848  * and operations we'd like to see to enable certain features in the allow map
7849  */
7850 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
7851         .how = SP4_MACH_CRED,
7852         .enforce.u.words = {
7853                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
7854                       1 << (OP_EXCHANGE_ID - 32) |
7855                       1 << (OP_CREATE_SESSION - 32) |
7856                       1 << (OP_DESTROY_SESSION - 32) |
7857                       1 << (OP_DESTROY_CLIENTID - 32)
7858         },
7859         .allow.u.words = {
7860                 [0] = 1 << (OP_CLOSE) |
7861                       1 << (OP_OPEN_DOWNGRADE) |
7862                       1 << (OP_LOCKU) |
7863                       1 << (OP_DELEGRETURN) |
7864                       1 << (OP_COMMIT),
7865                 [1] = 1 << (OP_SECINFO - 32) |
7866                       1 << (OP_SECINFO_NO_NAME - 32) |
7867                       1 << (OP_LAYOUTRETURN - 32) |
7868                       1 << (OP_TEST_STATEID - 32) |
7869                       1 << (OP_FREE_STATEID - 32) |
7870                       1 << (OP_WRITE - 32)
7871         }
7872 };
7873
7874 /*
7875  * Select the state protection mode for client `clp' given the server results
7876  * from exchange_id in `sp'.
7877  *
7878  * Returns 0 on success, negative errno otherwise.
7879  */
7880 static int nfs4_sp4_select_mode(struct nfs_client *clp,
7881                                  struct nfs41_state_protection *sp)
7882 {
7883         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
7884                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
7885                       1 << (OP_EXCHANGE_ID - 32) |
7886                       1 << (OP_CREATE_SESSION - 32) |
7887                       1 << (OP_DESTROY_SESSION - 32) |
7888                       1 << (OP_DESTROY_CLIENTID - 32)
7889         };
7890         unsigned long flags = 0;
7891         unsigned int i;
7892         int ret = 0;
7893
7894         if (sp->how == SP4_MACH_CRED) {
7895                 /* Print state protect result */
7896                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
7897                 for (i = 0; i <= LAST_NFS4_OP; i++) {
7898                         if (test_bit(i, sp->enforce.u.longs))
7899                                 dfprintk(MOUNT, "  enforce op %d\n", i);
7900                         if (test_bit(i, sp->allow.u.longs))
7901                                 dfprintk(MOUNT, "  allow op %d\n", i);
7902                 }
7903
7904                 /* make sure nothing is on enforce list that isn't supported */
7905                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
7906                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
7907                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7908                                 ret = -EINVAL;
7909                                 goto out;
7910                         }
7911                 }
7912
7913                 /*
7914                  * Minimal mode - state operations are allowed to use machine
7915                  * credential.  Note this already happens by default, so the
7916                  * client doesn't have to do anything more than the negotiation.
7917                  *
7918                  * NOTE: we don't care if EXCHANGE_ID is in the list -
7919                  *       we're already using the machine cred for exchange_id
7920                  *       and will never use a different cred.
7921                  */
7922                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
7923                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
7924                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
7925                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
7926                         dfprintk(MOUNT, "sp4_mach_cred:\n");
7927                         dfprintk(MOUNT, "  minimal mode enabled\n");
7928                         __set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
7929                 } else {
7930                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7931                         ret = -EINVAL;
7932                         goto out;
7933                 }
7934
7935                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
7936                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
7937                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
7938                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
7939                         dfprintk(MOUNT, "  cleanup mode enabled\n");
7940                         __set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
7941                 }
7942
7943                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
7944                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
7945                         __set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
7946                 }
7947
7948                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
7949                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
7950                         dfprintk(MOUNT, "  secinfo mode enabled\n");
7951                         __set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
7952                 }
7953
7954                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
7955                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
7956                         dfprintk(MOUNT, "  stateid mode enabled\n");
7957                         __set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
7958                 }
7959
7960                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
7961                         dfprintk(MOUNT, "  write mode enabled\n");
7962                         __set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
7963                 }
7964
7965                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
7966                         dfprintk(MOUNT, "  commit mode enabled\n");
7967                         __set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
7968                 }
7969         }
7970 out:
7971         clp->cl_sp4_flags = flags;
7972         return ret;
7973 }
7974
7975 struct nfs41_exchange_id_data {
7976         struct nfs41_exchange_id_res res;
7977         struct nfs41_exchange_id_args args;
7978 };
7979
7980 static void nfs4_exchange_id_release(void *data)
7981 {
7982         struct nfs41_exchange_id_data *cdata =
7983                                         (struct nfs41_exchange_id_data *)data;
7984
7985         nfs_put_client(cdata->args.client);
7986         kfree(cdata->res.impl_id);
7987         kfree(cdata->res.server_scope);
7988         kfree(cdata->res.server_owner);
7989         kfree(cdata);
7990 }
7991
7992 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
7993         .rpc_release = nfs4_exchange_id_release,
7994 };
7995
7996 /*
7997  * _nfs4_proc_exchange_id()
7998  *
7999  * Wrapper for EXCHANGE_ID operation.
8000  */
8001 static struct rpc_task *
8002 nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
8003                         u32 sp4_how, struct rpc_xprt *xprt)
8004 {
8005         struct rpc_message msg = {
8006                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
8007                 .rpc_cred = cred,
8008         };
8009         struct rpc_task_setup task_setup_data = {
8010                 .rpc_client = clp->cl_rpcclient,
8011                 .callback_ops = &nfs4_exchange_id_call_ops,
8012                 .rpc_message = &msg,
8013                 .flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
8014         };
8015         struct nfs41_exchange_id_data *calldata;
8016         int status;
8017
8018         if (!refcount_inc_not_zero(&clp->cl_count))
8019                 return ERR_PTR(-EIO);
8020
8021         status = -ENOMEM;
8022         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8023         if (!calldata)
8024                 goto out;
8025
8026         nfs4_init_boot_verifier(clp, &calldata->args.verifier);
8027
8028         status = nfs4_init_uniform_client_string(clp);
8029         if (status)
8030                 goto out_calldata;
8031
8032         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
8033                                                 GFP_NOFS);
8034         status = -ENOMEM;
8035         if (unlikely(calldata->res.server_owner == NULL))
8036                 goto out_calldata;
8037
8038         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
8039                                         GFP_NOFS);
8040         if (unlikely(calldata->res.server_scope == NULL))
8041                 goto out_server_owner;
8042
8043         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
8044         if (unlikely(calldata->res.impl_id == NULL))
8045                 goto out_server_scope;
8046
8047         switch (sp4_how) {
8048         case SP4_NONE:
8049                 calldata->args.state_protect.how = SP4_NONE;
8050                 break;
8051
8052         case SP4_MACH_CRED:
8053                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
8054                 break;
8055
8056         default:
8057                 /* unsupported! */
8058                 WARN_ON_ONCE(1);
8059                 status = -EINVAL;
8060                 goto out_impl_id;
8061         }
8062         if (xprt) {
8063                 task_setup_data.rpc_xprt = xprt;
8064                 task_setup_data.flags |= RPC_TASK_SOFTCONN;
8065                 memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
8066                                 sizeof(calldata->args.verifier.data));
8067         }
8068         calldata->args.client = clp;
8069         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
8070         EXCHGID4_FLAG_BIND_PRINC_STATEID;
8071 #ifdef CONFIG_NFS_V4_1_MIGRATION
8072         calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
8073 #endif
8074         msg.rpc_argp = &calldata->args;
8075         msg.rpc_resp = &calldata->res;
8076         task_setup_data.callback_data = calldata;
8077
8078         return rpc_run_task(&task_setup_data);
8079
8080 out_impl_id:
8081         kfree(calldata->res.impl_id);
8082 out_server_scope:
8083         kfree(calldata->res.server_scope);
8084 out_server_owner:
8085         kfree(calldata->res.server_owner);
8086 out_calldata:
8087         kfree(calldata);
8088 out:
8089         nfs_put_client(clp);
8090         return ERR_PTR(status);
8091 }
8092
8093 /*
8094  * _nfs4_proc_exchange_id()
8095  *
8096  * Wrapper for EXCHANGE_ID operation.
8097  */
8098 static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
8099                         u32 sp4_how)
8100 {
8101         struct rpc_task *task;
8102         struct nfs41_exchange_id_args *argp;
8103         struct nfs41_exchange_id_res *resp;
8104         int status;
8105
8106         task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
8107         if (IS_ERR(task))
8108                 return PTR_ERR(task);
8109
8110         argp = task->tk_msg.rpc_argp;
8111         resp = task->tk_msg.rpc_resp;
8112         status = task->tk_status;
8113         if (status  != 0)
8114                 goto out;
8115
8116         status = nfs4_check_cl_exchange_flags(resp->flags);
8117         if (status  != 0)
8118                 goto out;
8119
8120         status = nfs4_sp4_select_mode(clp, &resp->state_protect);
8121         if (status != 0)
8122                 goto out;
8123
8124         clp->cl_clientid = resp->clientid;
8125         clp->cl_exchange_flags = resp->flags;
8126         clp->cl_seqid = resp->seqid;
8127         /* Client ID is not confirmed */
8128         if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
8129                 clear_bit(NFS4_SESSION_ESTABLISHED,
8130                           &clp->cl_session->session_state);
8131
8132         if (clp->cl_serverscope != NULL &&
8133             !nfs41_same_server_scope(clp->cl_serverscope,
8134                                 resp->server_scope)) {
8135                 dprintk("%s: server_scope mismatch detected\n",
8136                         __func__);
8137                 set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
8138         }
8139
8140         swap(clp->cl_serverowner, resp->server_owner);
8141         swap(clp->cl_serverscope, resp->server_scope);
8142         swap(clp->cl_implid, resp->impl_id);
8143
8144         /* Save the EXCHANGE_ID verifier session trunk tests */
8145         memcpy(clp->cl_confirm.data, argp->verifier.data,
8146                sizeof(clp->cl_confirm.data));
8147 out:
8148         trace_nfs4_exchange_id(clp, status);
8149         rpc_put_task(task);
8150         return status;
8151 }
8152
8153 /*
8154  * nfs4_proc_exchange_id()
8155  *
8156  * Returns zero, a negative errno, or a negative NFS4ERR status code.
8157  *
8158  * Since the clientid has expired, all compounds using sessions
8159  * associated with the stale clientid will be returning
8160  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
8161  * be in some phase of session reset.
8162  *
8163  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
8164  */
8165 int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
8166 {
8167         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
8168         int status;
8169
8170         /* try SP4_MACH_CRED if krb5i/p */
8171         if (authflavor == RPC_AUTH_GSS_KRB5I ||
8172             authflavor == RPC_AUTH_GSS_KRB5P) {
8173                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
8174                 if (!status)
8175                         return 0;
8176         }
8177
8178         /* try SP4_NONE */
8179         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
8180 }
8181
8182 /**
8183  * nfs4_test_session_trunk
8184  *
8185  * This is an add_xprt_test() test function called from
8186  * rpc_clnt_setup_test_and_add_xprt.
8187  *
8188  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
8189  * and is dereferrenced in nfs4_exchange_id_release
8190  *
8191  * Upon success, add the new transport to the rpc_clnt
8192  *
8193  * @clnt: struct rpc_clnt to get new transport
8194  * @xprt: the rpc_xprt to test
8195  * @data: call data for _nfs4_proc_exchange_id.
8196  */
8197 void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
8198                             void *data)
8199 {
8200         struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data;
8201         struct rpc_task *task;
8202         int status;
8203
8204         u32 sp4_how;
8205
8206         dprintk("--> %s try %s\n", __func__,
8207                 xprt->address_strings[RPC_DISPLAY_ADDR]);
8208
8209         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
8210
8211         /* Test connection for session trunking. Async exchange_id call */
8212         task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
8213         if (IS_ERR(task))
8214                 return;
8215
8216         status = task->tk_status;
8217         if (status == 0)
8218                 status = nfs4_detect_session_trunking(adata->clp,
8219                                 task->tk_msg.rpc_resp, xprt);
8220
8221         if (status == 0)
8222                 rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
8223
8224         rpc_put_task(task);
8225 }
8226 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
8227
8228 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
8229                 const struct cred *cred)
8230 {
8231         struct rpc_message msg = {
8232                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
8233                 .rpc_argp = clp,
8234                 .rpc_cred = cred,
8235         };
8236         int status;
8237
8238         status = rpc_call_sync(clp->cl_rpcclient, &msg,
8239                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8240         trace_nfs4_destroy_clientid(clp, status);
8241         if (status)
8242                 dprintk("NFS: Got error %d from the server %s on "
8243                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
8244         return status;
8245 }
8246
8247 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
8248                 const struct cred *cred)
8249 {
8250         unsigned int loop;
8251         int ret;
8252
8253         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
8254                 ret = _nfs4_proc_destroy_clientid(clp, cred);
8255                 switch (ret) {
8256                 case -NFS4ERR_DELAY:
8257                 case -NFS4ERR_CLIENTID_BUSY:
8258                         ssleep(1);
8259                         break;
8260                 default:
8261                         return ret;
8262                 }
8263         }
8264         return 0;
8265 }
8266
8267 int nfs4_destroy_clientid(struct nfs_client *clp)
8268 {
8269         const struct cred *cred;
8270         int ret = 0;
8271
8272         if (clp->cl_mvops->minor_version < 1)
8273                 goto out;
8274         if (clp->cl_exchange_flags == 0)
8275                 goto out;
8276         if (clp->cl_preserve_clid)
8277                 goto out;
8278         cred = nfs4_get_clid_cred(clp);
8279         ret = nfs4_proc_destroy_clientid(clp, cred);
8280         put_cred(cred);
8281         switch (ret) {
8282         case 0:
8283         case -NFS4ERR_STALE_CLIENTID:
8284                 clp->cl_exchange_flags = 0;
8285         }
8286 out:
8287         return ret;
8288 }
8289
8290 #endif /* CONFIG_NFS_V4_1 */
8291
8292 struct nfs4_get_lease_time_data {
8293         struct nfs4_get_lease_time_args *args;
8294         struct nfs4_get_lease_time_res *res;
8295         struct nfs_client *clp;
8296 };
8297
8298 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
8299                                         void *calldata)
8300 {
8301         struct nfs4_get_lease_time_data *data =
8302                         (struct nfs4_get_lease_time_data *)calldata;
8303
8304         dprintk("--> %s\n", __func__);
8305         /* just setup sequence, do not trigger session recovery
8306            since we're invoked within one */
8307         nfs4_setup_sequence(data->clp,
8308                         &data->args->la_seq_args,
8309                         &data->res->lr_seq_res,
8310                         task);
8311         dprintk("<-- %s\n", __func__);
8312 }
8313
8314 /*
8315  * Called from nfs4_state_manager thread for session setup, so don't recover
8316  * from sequence operation or clientid errors.
8317  */
8318 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
8319 {
8320         struct nfs4_get_lease_time_data *data =
8321                         (struct nfs4_get_lease_time_data *)calldata;
8322
8323         dprintk("--> %s\n", __func__);
8324         if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
8325                 return;
8326         switch (task->tk_status) {
8327         case -NFS4ERR_DELAY:
8328         case -NFS4ERR_GRACE:
8329                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
8330                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
8331                 task->tk_status = 0;
8332                 /* fall through */
8333         case -NFS4ERR_RETRY_UNCACHED_REP:
8334                 rpc_restart_call_prepare(task);
8335                 return;
8336         }
8337         dprintk("<-- %s\n", __func__);
8338 }
8339
8340 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
8341         .rpc_call_prepare = nfs4_get_lease_time_prepare,
8342         .rpc_call_done = nfs4_get_lease_time_done,
8343 };
8344
8345 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
8346 {
8347         struct rpc_task *task;
8348         struct nfs4_get_lease_time_args args;
8349         struct nfs4_get_lease_time_res res = {
8350                 .lr_fsinfo = fsinfo,
8351         };
8352         struct nfs4_get_lease_time_data data = {
8353                 .args = &args,
8354                 .res = &res,
8355                 .clp = clp,
8356         };
8357         struct rpc_message msg = {
8358                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
8359                 .rpc_argp = &args,
8360                 .rpc_resp = &res,
8361         };
8362         struct rpc_task_setup task_setup = {
8363                 .rpc_client = clp->cl_rpcclient,
8364                 .rpc_message = &msg,
8365                 .callback_ops = &nfs4_get_lease_time_ops,
8366                 .callback_data = &data,
8367                 .flags = RPC_TASK_TIMEOUT,
8368         };
8369         int status;
8370
8371         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
8372         task = rpc_run_task(&task_setup);
8373
8374         if (IS_ERR(task))
8375                 return PTR_ERR(task);
8376
8377         status = task->tk_status;
8378         rpc_put_task(task);
8379         return status;
8380 }
8381
8382 #ifdef CONFIG_NFS_V4_1
8383
8384 /*
8385  * Initialize the values to be used by the client in CREATE_SESSION
8386  * If nfs4_init_session set the fore channel request and response sizes,
8387  * use them.
8388  *
8389  * Set the back channel max_resp_sz_cached to zero to force the client to
8390  * always set csa_cachethis to FALSE because the current implementation
8391  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
8392  */
8393 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
8394                                     struct rpc_clnt *clnt)
8395 {
8396         unsigned int max_rqst_sz, max_resp_sz;
8397         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
8398         unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
8399
8400         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
8401         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
8402
8403         /* Fore channel attributes */
8404         args->fc_attrs.max_rqst_sz = max_rqst_sz;
8405         args->fc_attrs.max_resp_sz = max_resp_sz;
8406         args->fc_attrs.max_ops = NFS4_MAX_OPS;
8407         args->fc_attrs.max_reqs = max_session_slots;
8408
8409         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
8410                 "max_ops=%u max_reqs=%u\n",
8411                 __func__,
8412                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
8413                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
8414
8415         /* Back channel attributes */
8416         args->bc_attrs.max_rqst_sz = max_bc_payload;
8417         args->bc_attrs.max_resp_sz = max_bc_payload;
8418         args->bc_attrs.max_resp_sz_cached = 0;
8419         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
8420         args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
8421         if (args->bc_attrs.max_reqs > max_bc_slots)
8422                 args->bc_attrs.max_reqs = max_bc_slots;
8423
8424         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
8425                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
8426                 __func__,
8427                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
8428                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
8429                 args->bc_attrs.max_reqs);
8430 }
8431
8432 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
8433                 struct nfs41_create_session_res *res)
8434 {
8435         struct nfs4_channel_attrs *sent = &args->fc_attrs;
8436         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
8437
8438         if (rcvd->max_resp_sz > sent->max_resp_sz)
8439                 return -EINVAL;
8440         /*
8441          * Our requested max_ops is the minimum we need; we're not
8442          * prepared to break up compounds into smaller pieces than that.
8443          * So, no point even trying to continue if the server won't
8444          * cooperate:
8445          */
8446         if (rcvd->max_ops < sent->max_ops)
8447                 return -EINVAL;
8448         if (rcvd->max_reqs == 0)
8449                 return -EINVAL;
8450         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
8451                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
8452         return 0;
8453 }
8454
8455 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
8456                 struct nfs41_create_session_res *res)
8457 {
8458         struct nfs4_channel_attrs *sent = &args->bc_attrs;
8459         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
8460
8461         if (!(res->flags & SESSION4_BACK_CHAN))
8462                 goto out;
8463         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
8464                 return -EINVAL;
8465         if (rcvd->max_resp_sz < sent->max_resp_sz)
8466                 return -EINVAL;
8467         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
8468                 return -EINVAL;
8469         if (rcvd->max_ops > sent->max_ops)
8470                 return -EINVAL;
8471         if (rcvd->max_reqs > sent->max_reqs)
8472                 return -EINVAL;
8473 out:
8474         return 0;
8475 }
8476
8477 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
8478                                      struct nfs41_create_session_res *res)
8479 {
8480         int ret;
8481
8482         ret = nfs4_verify_fore_channel_attrs(args, res);
8483         if (ret)
8484                 return ret;
8485         return nfs4_verify_back_channel_attrs(args, res);
8486 }
8487
8488 static void nfs4_update_session(struct nfs4_session *session,
8489                 struct nfs41_create_session_res *res)
8490 {
8491         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
8492         /* Mark client id and session as being confirmed */
8493         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
8494         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
8495         session->flags = res->flags;
8496         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
8497         if (res->flags & SESSION4_BACK_CHAN)
8498                 memcpy(&session->bc_attrs, &res->bc_attrs,
8499                                 sizeof(session->bc_attrs));
8500 }
8501
8502 static int _nfs4_proc_create_session(struct nfs_client *clp,
8503                 const struct cred *cred)
8504 {
8505         struct nfs4_session *session = clp->cl_session;
8506         struct nfs41_create_session_args args = {
8507                 .client = clp,
8508                 .clientid = clp->cl_clientid,
8509                 .seqid = clp->cl_seqid,
8510                 .cb_program = NFS4_CALLBACK,
8511         };
8512         struct nfs41_create_session_res res;
8513
8514         struct rpc_message msg = {
8515                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
8516                 .rpc_argp = &args,
8517                 .rpc_resp = &res,
8518                 .rpc_cred = cred,
8519         };
8520         int status;
8521
8522         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
8523         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
8524
8525         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
8526                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8527         trace_nfs4_create_session(clp, status);
8528
8529         switch (status) {
8530         case -NFS4ERR_STALE_CLIENTID:
8531         case -NFS4ERR_DELAY:
8532         case -ETIMEDOUT:
8533         case -EACCES:
8534         case -EAGAIN:
8535                 goto out;
8536         };
8537
8538         clp->cl_seqid++;
8539         if (!status) {
8540                 /* Verify the session's negotiated channel_attrs values */
8541                 status = nfs4_verify_channel_attrs(&args, &res);
8542                 /* Increment the clientid slot sequence id */
8543                 if (status)
8544                         goto out;
8545                 nfs4_update_session(session, &res);
8546         }
8547 out:
8548         return status;
8549 }
8550
8551 /*
8552  * Issues a CREATE_SESSION operation to the server.
8553  * It is the responsibility of the caller to verify the session is
8554  * expired before calling this routine.
8555  */
8556 int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
8557 {
8558         int status;
8559         unsigned *ptr;
8560         struct nfs4_session *session = clp->cl_session;
8561
8562         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
8563
8564         status = _nfs4_proc_create_session(clp, cred);
8565         if (status)
8566                 goto out;
8567
8568         /* Init or reset the session slot tables */
8569         status = nfs4_setup_session_slot_tables(session);
8570         dprintk("slot table setup returned %d\n", status);
8571         if (status)
8572                 goto out;
8573
8574         ptr = (unsigned *)&session->sess_id.data[0];
8575         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
8576                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
8577 out:
8578         dprintk("<-- %s\n", __func__);
8579         return status;
8580 }
8581
8582 /*
8583  * Issue the over-the-wire RPC DESTROY_SESSION.
8584  * The caller must serialize access to this routine.
8585  */
8586 int nfs4_proc_destroy_session(struct nfs4_session *session,
8587                 const struct cred *cred)
8588 {
8589         struct rpc_message msg = {
8590                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
8591                 .rpc_argp = session,
8592                 .rpc_cred = cred,
8593         };
8594         int status = 0;
8595
8596         dprintk("--> nfs4_proc_destroy_session\n");
8597
8598         /* session is still being setup */
8599         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
8600                 return 0;
8601
8602         status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
8603                                RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
8604         trace_nfs4_destroy_session(session->clp, status);
8605
8606         if (status)
8607                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
8608                         "Session has been destroyed regardless...\n", status);
8609
8610         dprintk("<-- nfs4_proc_destroy_session\n");
8611         return status;
8612 }
8613
8614 /*
8615  * Renew the cl_session lease.
8616  */
8617 struct nfs4_sequence_data {
8618         struct nfs_client *clp;
8619         struct nfs4_sequence_args args;
8620         struct nfs4_sequence_res res;
8621 };
8622
8623 static void nfs41_sequence_release(void *data)
8624 {
8625         struct nfs4_sequence_data *calldata = data;
8626         struct nfs_client *clp = calldata->clp;
8627
8628         if (refcount_read(&clp->cl_count) > 1)
8629                 nfs4_schedule_state_renewal(clp);
8630         nfs_put_client(clp);
8631         kfree(calldata);
8632 }
8633
8634 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
8635 {
8636         switch(task->tk_status) {
8637         case -NFS4ERR_DELAY:
8638                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
8639                 return -EAGAIN;
8640         default:
8641                 nfs4_schedule_lease_recovery(clp);
8642         }
8643         return 0;
8644 }
8645
8646 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
8647 {
8648         struct nfs4_sequence_data *calldata = data;
8649         struct nfs_client *clp = calldata->clp;
8650
8651         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
8652                 return;
8653
8654         trace_nfs4_sequence(clp, task->tk_status);
8655         if (task->tk_status < 0) {
8656                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
8657                 if (refcount_read(&clp->cl_count) == 1)
8658                         goto out;
8659
8660                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
8661                         rpc_restart_call_prepare(task);
8662                         return;
8663                 }
8664         }
8665         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
8666 out:
8667         dprintk("<-- %s\n", __func__);
8668 }
8669
8670 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
8671 {
8672         struct nfs4_sequence_data *calldata = data;
8673         struct nfs_client *clp = calldata->clp;
8674         struct nfs4_sequence_args *args;
8675         struct nfs4_sequence_res *res;
8676
8677         args = task->tk_msg.rpc_argp;
8678         res = task->tk_msg.rpc_resp;
8679
8680         nfs4_setup_sequence(clp, args, res, task);
8681 }
8682
8683 static const struct rpc_call_ops nfs41_sequence_ops = {
8684         .rpc_call_done = nfs41_sequence_call_done,
8685         .rpc_call_prepare = nfs41_sequence_prepare,
8686         .rpc_release = nfs41_sequence_release,
8687 };
8688
8689 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
8690                 const struct cred *cred,
8691                 struct nfs4_slot *slot,
8692                 bool is_privileged)
8693 {
8694         struct nfs4_sequence_data *calldata;
8695         struct rpc_message msg = {
8696                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
8697                 .rpc_cred = cred,
8698         };
8699         struct rpc_task_setup task_setup_data = {
8700                 .rpc_client = clp->cl_rpcclient,
8701                 .rpc_message = &msg,
8702                 .callback_ops = &nfs41_sequence_ops,
8703                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
8704         };
8705         struct rpc_task *ret;
8706
8707         ret = ERR_PTR(-EIO);
8708         if (!refcount_inc_not_zero(&clp->cl_count))
8709                 goto out_err;
8710
8711         ret = ERR_PTR(-ENOMEM);
8712         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8713         if (calldata == NULL)
8714                 goto out_put_clp;
8715         nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
8716         nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
8717         msg.rpc_argp = &calldata->args;
8718         msg.rpc_resp = &calldata->res;
8719         calldata->clp = clp;
8720         task_setup_data.callback_data = calldata;
8721
8722         ret = rpc_run_task(&task_setup_data);
8723         if (IS_ERR(ret))
8724                 goto out_err;
8725         return ret;
8726 out_put_clp:
8727         nfs_put_client(clp);
8728 out_err:
8729         nfs41_release_slot(slot);
8730         return ret;
8731 }
8732
8733 static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
8734 {
8735         struct rpc_task *task;
8736         int ret = 0;
8737
8738         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
8739                 return -EAGAIN;
8740         task = _nfs41_proc_sequence(clp, cred, NULL, false);
8741         if (IS_ERR(task))
8742                 ret = PTR_ERR(task);
8743         else
8744                 rpc_put_task_async(task);
8745         dprintk("<-- %s status=%d\n", __func__, ret);
8746         return ret;
8747 }
8748
8749 static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
8750 {
8751         struct rpc_task *task;
8752         int ret;
8753
8754         task = _nfs41_proc_sequence(clp, cred, NULL, true);
8755         if (IS_ERR(task)) {
8756                 ret = PTR_ERR(task);
8757                 goto out;
8758         }
8759         ret = rpc_wait_for_completion_task(task);
8760         if (!ret)
8761                 ret = task->tk_status;
8762         rpc_put_task(task);
8763 out:
8764         dprintk("<-- %s status=%d\n", __func__, ret);
8765         return ret;
8766 }
8767
8768 struct nfs4_reclaim_complete_data {
8769         struct nfs_client *clp;
8770         struct nfs41_reclaim_complete_args arg;
8771         struct nfs41_reclaim_complete_res res;
8772 };
8773
8774 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
8775 {
8776         struct nfs4_reclaim_complete_data *calldata = data;
8777
8778         nfs4_setup_sequence(calldata->clp,
8779                         &calldata->arg.seq_args,
8780                         &calldata->res.seq_res,
8781                         task);
8782 }
8783
8784 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
8785 {
8786         switch(task->tk_status) {
8787         case 0:
8788                 wake_up_all(&clp->cl_lock_waitq);
8789                 /* Fallthrough */
8790         case -NFS4ERR_COMPLETE_ALREADY:
8791         case -NFS4ERR_WRONG_CRED: /* What to do here? */
8792                 break;
8793         case -NFS4ERR_DELAY:
8794                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
8795                 /* fall through */
8796         case -NFS4ERR_RETRY_UNCACHED_REP:
8797                 return -EAGAIN;
8798         case -NFS4ERR_BADSESSION:
8799         case -NFS4ERR_DEADSESSION:
8800         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
8801                 nfs4_schedule_session_recovery(clp->cl_session,
8802                                 task->tk_status);
8803                 break;
8804         default:
8805                 nfs4_schedule_lease_recovery(clp);
8806         }
8807         return 0;
8808 }
8809
8810 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
8811 {
8812         struct nfs4_reclaim_complete_data *calldata = data;
8813         struct nfs_client *clp = calldata->clp;
8814         struct nfs4_sequence_res *res = &calldata->res.seq_res;
8815
8816         dprintk("--> %s\n", __func__);
8817         if (!nfs41_sequence_done(task, res))
8818                 return;
8819
8820         trace_nfs4_reclaim_complete(clp, task->tk_status);
8821         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
8822                 rpc_restart_call_prepare(task);
8823                 return;
8824         }
8825         dprintk("<-- %s\n", __func__);
8826 }
8827
8828 static void nfs4_free_reclaim_complete_data(void *data)
8829 {
8830         struct nfs4_reclaim_complete_data *calldata = data;
8831
8832         kfree(calldata);
8833 }
8834
8835 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
8836         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
8837         .rpc_call_done = nfs4_reclaim_complete_done,
8838         .rpc_release = nfs4_free_reclaim_complete_data,
8839 };
8840
8841 /*
8842  * Issue a global reclaim complete.
8843  */
8844 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
8845                 const struct cred *cred)
8846 {
8847         struct nfs4_reclaim_complete_data *calldata;
8848         struct rpc_task *task;
8849         struct rpc_message msg = {
8850                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
8851                 .rpc_cred = cred,
8852         };
8853         struct rpc_task_setup task_setup_data = {
8854                 .rpc_client = clp->cl_rpcclient,
8855                 .rpc_message = &msg,
8856                 .callback_ops = &nfs4_reclaim_complete_call_ops,
8857                 .flags = RPC_TASK_ASYNC | RPC_TASK_NO_ROUND_ROBIN,
8858         };
8859         int status = -ENOMEM;
8860
8861         dprintk("--> %s\n", __func__);
8862         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8863         if (calldata == NULL)
8864                 goto out;
8865         calldata->clp = clp;
8866         calldata->arg.one_fs = 0;
8867
8868         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
8869         msg.rpc_argp = &calldata->arg;
8870         msg.rpc_resp = &calldata->res;
8871         task_setup_data.callback_data = calldata;
8872         task = rpc_run_task(&task_setup_data);
8873         if (IS_ERR(task)) {
8874                 status = PTR_ERR(task);
8875                 goto out;
8876         }
8877         status = rpc_wait_for_completion_task(task);
8878         if (status == 0)
8879                 status = task->tk_status;
8880         rpc_put_task(task);
8881 out:
8882         dprintk("<-- %s status=%d\n", __func__, status);
8883         return status;
8884 }
8885
8886 static void
8887 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
8888 {
8889         struct nfs4_layoutget *lgp = calldata;
8890         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
8891
8892         dprintk("--> %s\n", __func__);
8893         nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
8894                                 &lgp->res.seq_res, task);
8895         dprintk("<-- %s\n", __func__);
8896 }
8897
8898 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
8899 {
8900         struct nfs4_layoutget *lgp = calldata;
8901
8902         dprintk("--> %s\n", __func__);
8903         nfs41_sequence_process(task, &lgp->res.seq_res);
8904         dprintk("<-- %s\n", __func__);
8905 }
8906
8907 static int
8908 nfs4_layoutget_handle_exception(struct rpc_task *task,
8909                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
8910 {
8911         struct inode *inode = lgp->args.inode;
8912         struct nfs_server *server = NFS_SERVER(inode);
8913         struct pnfs_layout_hdr *lo;
8914         int nfs4err = task->tk_status;
8915         int err, status = 0;
8916         LIST_HEAD(head);
8917
8918         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
8919
8920         nfs4_sequence_free_slot(&lgp->res.seq_res);
8921
8922         switch (nfs4err) {
8923         case 0:
8924                 goto out;
8925
8926         /*
8927          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
8928          * on the file. set tk_status to -ENODATA to tell upper layer to
8929          * retry go inband.
8930          */
8931         case -NFS4ERR_LAYOUTUNAVAILABLE:
8932                 status = -ENODATA;
8933                 goto out;
8934         /*
8935          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
8936          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
8937          */
8938         case -NFS4ERR_BADLAYOUT:
8939                 status = -EOVERFLOW;
8940                 goto out;
8941         /*
8942          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
8943          * (or clients) writing to the same RAID stripe except when
8944          * the minlength argument is 0 (see RFC5661 section 18.43.3).
8945          *
8946          * Treat it like we would RECALLCONFLICT -- we retry for a little
8947          * while, and then eventually give up.
8948          */
8949         case -NFS4ERR_LAYOUTTRYLATER:
8950                 if (lgp->args.minlength == 0) {
8951                         status = -EOVERFLOW;
8952                         goto out;
8953                 }
8954                 status = -EBUSY;
8955                 break;
8956         case -NFS4ERR_RECALLCONFLICT:
8957                 status = -ERECALLCONFLICT;
8958                 break;
8959         case -NFS4ERR_DELEG_REVOKED:
8960         case -NFS4ERR_ADMIN_REVOKED:
8961         case -NFS4ERR_EXPIRED:
8962         case -NFS4ERR_BAD_STATEID:
8963                 exception->timeout = 0;
8964                 spin_lock(&inode->i_lock);
8965                 lo = NFS_I(inode)->layout;
8966                 /* If the open stateid was bad, then recover it. */
8967                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
8968                     !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
8969                         spin_unlock(&inode->i_lock);
8970                         exception->state = lgp->args.ctx->state;
8971                         exception->stateid = &lgp->args.stateid;
8972                         break;
8973                 }
8974
8975                 /*
8976                  * Mark the bad layout state as invalid, then retry
8977                  */
8978                 pnfs_mark_layout_stateid_invalid(lo, &head);
8979                 spin_unlock(&inode->i_lock);
8980                 nfs_commit_inode(inode, 0);
8981                 pnfs_free_lseg_list(&head);
8982                 status = -EAGAIN;
8983                 goto out;
8984         }
8985
8986         err = nfs4_handle_exception(server, nfs4err, exception);
8987         if (!status) {
8988                 if (exception->retry)
8989                         status = -EAGAIN;
8990                 else
8991                         status = err;
8992         }
8993 out:
8994         dprintk("<-- %s\n", __func__);
8995         return status;
8996 }
8997
8998 size_t max_response_pages(struct nfs_server *server)
8999 {
9000         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
9001         return nfs_page_array_len(0, max_resp_sz);
9002 }
9003
9004 static void nfs4_layoutget_release(void *calldata)
9005 {
9006         struct nfs4_layoutget *lgp = calldata;
9007
9008         dprintk("--> %s\n", __func__);
9009         nfs4_sequence_free_slot(&lgp->res.seq_res);
9010         pnfs_layoutget_free(lgp);
9011         dprintk("<-- %s\n", __func__);
9012 }
9013
9014 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
9015         .rpc_call_prepare = nfs4_layoutget_prepare,
9016         .rpc_call_done = nfs4_layoutget_done,
9017         .rpc_release = nfs4_layoutget_release,
9018 };
9019
9020 struct pnfs_layout_segment *
9021 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
9022 {
9023         struct inode *inode = lgp->args.inode;
9024         struct nfs_server *server = NFS_SERVER(inode);
9025         struct rpc_task *task;
9026         struct rpc_message msg = {
9027                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
9028                 .rpc_argp = &lgp->args,
9029                 .rpc_resp = &lgp->res,
9030                 .rpc_cred = lgp->cred,
9031         };
9032         struct rpc_task_setup task_setup_data = {
9033                 .rpc_client = server->client,
9034                 .rpc_message = &msg,
9035                 .callback_ops = &nfs4_layoutget_call_ops,
9036                 .callback_data = lgp,
9037                 .flags = RPC_TASK_ASYNC,
9038         };
9039         struct pnfs_layout_segment *lseg = NULL;
9040         struct nfs4_exception exception = {
9041                 .inode = inode,
9042                 .timeout = *timeout,
9043         };
9044         int status = 0;
9045
9046         dprintk("--> %s\n", __func__);
9047
9048         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
9049         pnfs_get_layout_hdr(NFS_I(inode)->layout);
9050
9051         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
9052
9053         task = rpc_run_task(&task_setup_data);
9054         if (IS_ERR(task))
9055                 return ERR_CAST(task);
9056         status = rpc_wait_for_completion_task(task);
9057         if (status != 0)
9058                 goto out;
9059
9060         if (task->tk_status < 0) {
9061                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
9062                 *timeout = exception.timeout;
9063         } else if (lgp->res.layoutp->len == 0) {
9064                 status = -EAGAIN;
9065                 *timeout = nfs4_update_delay(&exception.timeout);
9066         } else
9067                 lseg = pnfs_layout_process(lgp);
9068 out:
9069         trace_nfs4_layoutget(lgp->args.ctx,
9070                         &lgp->args.range,
9071                         &lgp->res.range,
9072                         &lgp->res.stateid,
9073                         status);
9074
9075         rpc_put_task(task);
9076         dprintk("<-- %s status=%d\n", __func__, status);
9077         if (status)
9078                 return ERR_PTR(status);
9079         return lseg;
9080 }
9081
9082 static void
9083 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
9084 {
9085         struct nfs4_layoutreturn *lrp = calldata;
9086
9087         dprintk("--> %s\n", __func__);
9088         nfs4_setup_sequence(lrp->clp,
9089                         &lrp->args.seq_args,
9090                         &lrp->res.seq_res,
9091                         task);
9092         if (!pnfs_layout_is_valid(lrp->args.layout))
9093                 rpc_exit(task, 0);
9094 }
9095
9096 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
9097 {
9098         struct nfs4_layoutreturn *lrp = calldata;
9099         struct nfs_server *server;
9100
9101         dprintk("--> %s\n", __func__);
9102
9103         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
9104                 return;
9105
9106         server = NFS_SERVER(lrp->args.inode);
9107         switch (task->tk_status) {
9108         case -NFS4ERR_OLD_STATEID:
9109                 if (nfs4_layoutreturn_refresh_stateid(&lrp->args.stateid,
9110                                         &lrp->args.range,
9111                                         lrp->args.inode))
9112                         goto out_restart;
9113                 /* Fallthrough */
9114         default:
9115                 task->tk_status = 0;
9116                 /* Fallthrough */
9117         case 0:
9118                 break;
9119         case -NFS4ERR_DELAY:
9120                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
9121                         break;
9122                 goto out_restart;
9123         }
9124         dprintk("<-- %s\n", __func__);
9125         return;
9126 out_restart:
9127         task->tk_status = 0;
9128         nfs4_sequence_free_slot(&lrp->res.seq_res);
9129         rpc_restart_call_prepare(task);
9130 }
9131
9132 static void nfs4_layoutreturn_release(void *calldata)
9133 {
9134         struct nfs4_layoutreturn *lrp = calldata;
9135         struct pnfs_layout_hdr *lo = lrp->args.layout;
9136
9137         dprintk("--> %s\n", __func__);
9138         pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
9139                         lrp->res.lrs_present ? &lrp->res.stateid : NULL);
9140         nfs4_sequence_free_slot(&lrp->res.seq_res);
9141         if (lrp->ld_private.ops && lrp->ld_private.ops->free)
9142                 lrp->ld_private.ops->free(&lrp->ld_private);
9143         pnfs_put_layout_hdr(lrp->args.layout);
9144         nfs_iput_and_deactive(lrp->inode);
9145         kfree(calldata);
9146         dprintk("<-- %s\n", __func__);
9147 }
9148
9149 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
9150         .rpc_call_prepare = nfs4_layoutreturn_prepare,
9151         .rpc_call_done = nfs4_layoutreturn_done,
9152         .rpc_release = nfs4_layoutreturn_release,
9153 };
9154
9155 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
9156 {
9157         struct rpc_task *task;
9158         struct rpc_message msg = {
9159                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
9160                 .rpc_argp = &lrp->args,
9161                 .rpc_resp = &lrp->res,
9162                 .rpc_cred = lrp->cred,
9163         };
9164         struct rpc_task_setup task_setup_data = {
9165                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
9166                 .rpc_message = &msg,
9167                 .callback_ops = &nfs4_layoutreturn_call_ops,
9168                 .callback_data = lrp,
9169         };
9170         int status = 0;
9171
9172         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
9173                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
9174                         &task_setup_data.rpc_client, &msg);
9175
9176         dprintk("--> %s\n", __func__);
9177         if (!sync) {
9178                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
9179                 if (!lrp->inode) {
9180                         nfs4_layoutreturn_release(lrp);
9181                         return -EAGAIN;
9182                 }
9183                 task_setup_data.flags |= RPC_TASK_ASYNC;
9184         }
9185         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1, 0);
9186         task = rpc_run_task(&task_setup_data);
9187         if (IS_ERR(task))
9188                 return PTR_ERR(task);
9189         if (sync)
9190                 status = task->tk_status;
9191         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
9192         dprintk("<-- %s status=%d\n", __func__, status);
9193         rpc_put_task(task);
9194         return status;
9195 }
9196
9197 static int
9198 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
9199                 struct pnfs_device *pdev,
9200                 const struct cred *cred)
9201 {
9202         struct nfs4_getdeviceinfo_args args = {
9203                 .pdev = pdev,
9204                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
9205                         NOTIFY_DEVICEID4_DELETE,
9206         };
9207         struct nfs4_getdeviceinfo_res res = {
9208                 .pdev = pdev,
9209         };
9210         struct rpc_message msg = {
9211                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
9212                 .rpc_argp = &args,
9213                 .rpc_resp = &res,
9214                 .rpc_cred = cred,
9215         };
9216         int status;
9217
9218         dprintk("--> %s\n", __func__);
9219         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
9220         if (res.notification & ~args.notify_types)
9221                 dprintk("%s: unsupported notification\n", __func__);
9222         if (res.notification != args.notify_types)
9223                 pdev->nocache = 1;
9224
9225         dprintk("<-- %s status=%d\n", __func__, status);
9226
9227         return status;
9228 }
9229
9230 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
9231                 struct pnfs_device *pdev,
9232                 const struct cred *cred)
9233 {
9234         struct nfs4_exception exception = { };
9235         int err;
9236
9237         do {
9238                 err = nfs4_handle_exception(server,
9239                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
9240                                         &exception);
9241         } while (exception.retry);
9242         return err;
9243 }
9244 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
9245
9246 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
9247 {
9248         struct nfs4_layoutcommit_data *data = calldata;
9249         struct nfs_server *server = NFS_SERVER(data->args.inode);
9250
9251         nfs4_setup_sequence(server->nfs_client,
9252                         &data->args.seq_args,
9253                         &data->res.seq_res,
9254                         task);
9255 }
9256
9257 static void
9258 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
9259 {
9260         struct nfs4_layoutcommit_data *data = calldata;
9261         struct nfs_server *server = NFS_SERVER(data->args.inode);
9262
9263         if (!nfs41_sequence_done(task, &data->res.seq_res))
9264                 return;
9265
9266         switch (task->tk_status) { /* Just ignore these failures */
9267         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
9268         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
9269         case -NFS4ERR_BADLAYOUT:     /* no layout */
9270         case -NFS4ERR_GRACE:        /* loca_recalim always false */
9271                 task->tk_status = 0;
9272         case 0:
9273                 break;
9274         default:
9275                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
9276                         rpc_restart_call_prepare(task);
9277                         return;
9278                 }
9279         }
9280 }
9281
9282 static void nfs4_layoutcommit_release(void *calldata)
9283 {
9284         struct nfs4_layoutcommit_data *data = calldata;
9285
9286         pnfs_cleanup_layoutcommit(data);
9287         nfs_post_op_update_inode_force_wcc(data->args.inode,
9288                                            data->res.fattr);
9289         put_cred(data->cred);
9290         nfs_iput_and_deactive(data->inode);
9291         kfree(data);
9292 }
9293
9294 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
9295         .rpc_call_prepare = nfs4_layoutcommit_prepare,
9296         .rpc_call_done = nfs4_layoutcommit_done,
9297         .rpc_release = nfs4_layoutcommit_release,
9298 };
9299
9300 int
9301 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
9302 {
9303         struct rpc_message msg = {
9304                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
9305                 .rpc_argp = &data->args,
9306                 .rpc_resp = &data->res,
9307                 .rpc_cred = data->cred,
9308         };
9309         struct rpc_task_setup task_setup_data = {
9310                 .task = &data->task,
9311                 .rpc_client = NFS_CLIENT(data->args.inode),
9312                 .rpc_message = &msg,
9313                 .callback_ops = &nfs4_layoutcommit_ops,
9314                 .callback_data = data,
9315         };
9316         struct rpc_task *task;
9317         int status = 0;
9318
9319         dprintk("NFS: initiating layoutcommit call. sync %d "
9320                 "lbw: %llu inode %lu\n", sync,
9321                 data->args.lastbytewritten,
9322                 data->args.inode->i_ino);
9323
9324         if (!sync) {
9325                 data->inode = nfs_igrab_and_active(data->args.inode);
9326                 if (data->inode == NULL) {
9327                         nfs4_layoutcommit_release(data);
9328                         return -EAGAIN;
9329                 }
9330                 task_setup_data.flags = RPC_TASK_ASYNC;
9331         }
9332         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
9333         task = rpc_run_task(&task_setup_data);
9334         if (IS_ERR(task))
9335                 return PTR_ERR(task);
9336         if (sync)
9337                 status = task->tk_status;
9338         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
9339         dprintk("%s: status %d\n", __func__, status);
9340         rpc_put_task(task);
9341         return status;
9342 }
9343
9344 /*
9345  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
9346  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
9347  */
9348 static int
9349 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9350                     struct nfs_fsinfo *info,
9351                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
9352 {
9353         struct nfs41_secinfo_no_name_args args = {
9354                 .style = SECINFO_STYLE_CURRENT_FH,
9355         };
9356         struct nfs4_secinfo_res res = {
9357                 .flavors = flavors,
9358         };
9359         struct rpc_message msg = {
9360                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
9361                 .rpc_argp = &args,
9362                 .rpc_resp = &res,
9363         };
9364         struct rpc_clnt *clnt = server->client;
9365         const struct cred *cred = NULL;
9366         int status;
9367
9368         if (use_integrity) {
9369                 clnt = server->nfs_client->cl_rpcclient;
9370                 cred = nfs4_get_clid_cred(server->nfs_client);
9371                 msg.rpc_cred = cred;
9372         }
9373
9374         dprintk("--> %s\n", __func__);
9375         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
9376                                 &res.seq_res, RPC_TASK_NO_ROUND_ROBIN);
9377         dprintk("<-- %s status=%d\n", __func__, status);
9378
9379         put_cred(cred);
9380
9381         return status;
9382 }
9383
9384 static int
9385 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
9386                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
9387 {
9388         struct nfs4_exception exception = {
9389                 .interruptible = true,
9390         };
9391         int err;
9392         do {
9393                 /* first try using integrity protection */
9394                 err = -NFS4ERR_WRONGSEC;
9395
9396                 /* try to use integrity protection with machine cred */
9397                 if (_nfs4_is_integrity_protected(server->nfs_client))
9398                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9399                                                           flavors, true);
9400
9401                 /*
9402                  * if unable to use integrity protection, or SECINFO with
9403                  * integrity protection returns NFS4ERR_WRONGSEC (which is
9404                  * disallowed by spec, but exists in deployed servers) use
9405                  * the current filesystem's rpc_client and the user cred.
9406                  */
9407                 if (err == -NFS4ERR_WRONGSEC)
9408                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
9409                                                           flavors, false);
9410
9411                 switch (err) {
9412                 case 0:
9413                 case -NFS4ERR_WRONGSEC:
9414                 case -ENOTSUPP:
9415                         goto out;
9416                 default:
9417                         err = nfs4_handle_exception(server, err, &exception);
9418                 }
9419         } while (exception.retry);
9420 out:
9421         return err;
9422 }
9423
9424 static int
9425 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
9426                     struct nfs_fsinfo *info)
9427 {
9428         int err;
9429         struct page *page;
9430         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
9431         struct nfs4_secinfo_flavors *flavors;
9432         struct nfs4_secinfo4 *secinfo;
9433         int i;
9434
9435         page = alloc_page(GFP_KERNEL);
9436         if (!page) {
9437                 err = -ENOMEM;
9438                 goto out;
9439         }
9440
9441         flavors = page_address(page);
9442         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
9443
9444         /*
9445          * Fall back on "guess and check" method if
9446          * the server doesn't support SECINFO_NO_NAME
9447          */
9448         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
9449                 err = nfs4_find_root_sec(server, fhandle, info);
9450                 goto out_freepage;
9451         }
9452         if (err)
9453                 goto out_freepage;
9454
9455         for (i = 0; i < flavors->num_flavors; i++) {
9456                 secinfo = &flavors->flavors[i];
9457
9458                 switch (secinfo->flavor) {
9459                 case RPC_AUTH_NULL:
9460                 case RPC_AUTH_UNIX:
9461                 case RPC_AUTH_GSS:
9462                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
9463                                         &secinfo->flavor_info);
9464                         break;
9465                 default:
9466                         flavor = RPC_AUTH_MAXFLAVOR;
9467                         break;
9468                 }
9469
9470                 if (!nfs_auth_info_match(&server->auth_info, flavor))
9471                         flavor = RPC_AUTH_MAXFLAVOR;
9472
9473                 if (flavor != RPC_AUTH_MAXFLAVOR) {
9474                         err = nfs4_lookup_root_sec(server, fhandle,
9475                                                    info, flavor);
9476                         if (!err)
9477                                 break;
9478                 }
9479         }
9480
9481         if (flavor == RPC_AUTH_MAXFLAVOR)
9482                 err = -EPERM;
9483
9484 out_freepage:
9485         put_page(page);
9486         if (err == -EACCES)
9487                 return -EPERM;
9488 out:
9489         return err;
9490 }
9491
9492 static int _nfs41_test_stateid(struct nfs_server *server,
9493                 nfs4_stateid *stateid,
9494                 const struct cred *cred)
9495 {
9496         int status;
9497         struct nfs41_test_stateid_args args = {
9498                 .stateid = stateid,
9499         };
9500         struct nfs41_test_stateid_res res;
9501         struct rpc_message msg = {
9502                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
9503                 .rpc_argp = &args,
9504                 .rpc_resp = &res,
9505                 .rpc_cred = cred,
9506         };
9507         struct rpc_clnt *rpc_client = server->client;
9508
9509         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9510                 &rpc_client, &msg);
9511
9512         dprintk("NFS call  test_stateid %p\n", stateid);
9513         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
9514         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
9515                         &args.seq_args, &res.seq_res);
9516         if (status != NFS_OK) {
9517                 dprintk("NFS reply test_stateid: failed, %d\n", status);
9518                 return status;
9519         }
9520         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
9521         return -res.status;
9522 }
9523
9524 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
9525                 int err, struct nfs4_exception *exception)
9526 {
9527         exception->retry = 0;
9528         switch(err) {
9529         case -NFS4ERR_DELAY:
9530         case -NFS4ERR_RETRY_UNCACHED_REP:
9531                 nfs4_handle_exception(server, err, exception);
9532                 break;
9533         case -NFS4ERR_BADSESSION:
9534         case -NFS4ERR_BADSLOT:
9535         case -NFS4ERR_BAD_HIGH_SLOT:
9536         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
9537         case -NFS4ERR_DEADSESSION:
9538                 nfs4_do_handle_exception(server, err, exception);
9539         }
9540 }
9541
9542 /**
9543  * nfs41_test_stateid - perform a TEST_STATEID operation
9544  *
9545  * @server: server / transport on which to perform the operation
9546  * @stateid: state ID to test
9547  * @cred: credential
9548  *
9549  * Returns NFS_OK if the server recognizes that "stateid" is valid.
9550  * Otherwise a negative NFS4ERR value is returned if the operation
9551  * failed or the state ID is not currently valid.
9552  */
9553 static int nfs41_test_stateid(struct nfs_server *server,
9554                 nfs4_stateid *stateid,
9555                 const struct cred *cred)
9556 {
9557         struct nfs4_exception exception = {
9558                 .interruptible = true,
9559         };
9560         int err;
9561         do {
9562                 err = _nfs41_test_stateid(server, stateid, cred);
9563                 nfs4_handle_delay_or_session_error(server, err, &exception);
9564         } while (exception.retry);
9565         return err;
9566 }
9567
9568 struct nfs_free_stateid_data {
9569         struct nfs_server *server;
9570         struct nfs41_free_stateid_args args;
9571         struct nfs41_free_stateid_res res;
9572 };
9573
9574 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
9575 {
9576         struct nfs_free_stateid_data *data = calldata;
9577         nfs4_setup_sequence(data->server->nfs_client,
9578                         &data->args.seq_args,
9579                         &data->res.seq_res,
9580                         task);
9581 }
9582
9583 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
9584 {
9585         struct nfs_free_stateid_data *data = calldata;
9586
9587         nfs41_sequence_done(task, &data->res.seq_res);
9588
9589         switch (task->tk_status) {
9590         case -NFS4ERR_DELAY:
9591                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
9592                         rpc_restart_call_prepare(task);
9593         }
9594 }
9595
9596 static void nfs41_free_stateid_release(void *calldata)
9597 {
9598         kfree(calldata);
9599 }
9600
9601 static const struct rpc_call_ops nfs41_free_stateid_ops = {
9602         .rpc_call_prepare = nfs41_free_stateid_prepare,
9603         .rpc_call_done = nfs41_free_stateid_done,
9604         .rpc_release = nfs41_free_stateid_release,
9605 };
9606
9607 /**
9608  * nfs41_free_stateid - perform a FREE_STATEID operation
9609  *
9610  * @server: server / transport on which to perform the operation
9611  * @stateid: state ID to release
9612  * @cred: credential
9613  * @privileged: set to true if this call needs to be privileged
9614  *
9615  * Note: this function is always asynchronous.
9616  */
9617 static int nfs41_free_stateid(struct nfs_server *server,
9618                 const nfs4_stateid *stateid,
9619                 const struct cred *cred,
9620                 bool privileged)
9621 {
9622         struct rpc_message msg = {
9623                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
9624                 .rpc_cred = cred,
9625         };
9626         struct rpc_task_setup task_setup = {
9627                 .rpc_client = server->client,
9628                 .rpc_message = &msg,
9629                 .callback_ops = &nfs41_free_stateid_ops,
9630                 .flags = RPC_TASK_ASYNC,
9631         };
9632         struct nfs_free_stateid_data *data;
9633         struct rpc_task *task;
9634
9635         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
9636                 &task_setup.rpc_client, &msg);
9637
9638         dprintk("NFS call  free_stateid %p\n", stateid);
9639         data = kmalloc(sizeof(*data), GFP_NOFS);
9640         if (!data)
9641                 return -ENOMEM;
9642         data->server = server;
9643         nfs4_stateid_copy(&data->args.stateid, stateid);
9644
9645         task_setup.callback_data = data;
9646
9647         msg.rpc_argp = &data->args;
9648         msg.rpc_resp = &data->res;
9649         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
9650         task = rpc_run_task(&task_setup);
9651         if (IS_ERR(task))
9652                 return PTR_ERR(task);
9653         rpc_put_task(task);
9654         return 0;
9655 }
9656
9657 static void
9658 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
9659 {
9660         const struct cred *cred = lsp->ls_state->owner->so_cred;
9661
9662         nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
9663         nfs4_free_lock_state(server, lsp);
9664 }
9665
9666 static bool nfs41_match_stateid(const nfs4_stateid *s1,
9667                 const nfs4_stateid *s2)
9668 {
9669         if (s1->type != s2->type)
9670                 return false;
9671
9672         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
9673                 return false;
9674
9675         if (s1->seqid == s2->seqid)
9676                 return true;
9677
9678         return s1->seqid == 0 || s2->seqid == 0;
9679 }
9680
9681 #endif /* CONFIG_NFS_V4_1 */
9682
9683 static bool nfs4_match_stateid(const nfs4_stateid *s1,
9684                 const nfs4_stateid *s2)
9685 {
9686         return nfs4_stateid_match(s1, s2);
9687 }
9688
9689
9690 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
9691         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
9692         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
9693         .recover_open   = nfs4_open_reclaim,
9694         .recover_lock   = nfs4_lock_reclaim,
9695         .establish_clid = nfs4_init_clientid,
9696         .detect_trunking = nfs40_discover_server_trunking,
9697 };
9698
9699 #if defined(CONFIG_NFS_V4_1)
9700 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
9701         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
9702         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
9703         .recover_open   = nfs4_open_reclaim,
9704         .recover_lock   = nfs4_lock_reclaim,
9705         .establish_clid = nfs41_init_clientid,
9706         .reclaim_complete = nfs41_proc_reclaim_complete,
9707         .detect_trunking = nfs41_discover_server_trunking,
9708 };
9709 #endif /* CONFIG_NFS_V4_1 */
9710
9711 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
9712         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
9713         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
9714         .recover_open   = nfs40_open_expired,
9715         .recover_lock   = nfs4_lock_expired,
9716         .establish_clid = nfs4_init_clientid,
9717 };
9718
9719 #if defined(CONFIG_NFS_V4_1)
9720 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
9721         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
9722         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
9723         .recover_open   = nfs41_open_expired,
9724         .recover_lock   = nfs41_lock_expired,
9725         .establish_clid = nfs41_init_clientid,
9726 };
9727 #endif /* CONFIG_NFS_V4_1 */
9728
9729 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
9730         .sched_state_renewal = nfs4_proc_async_renew,
9731         .get_state_renewal_cred = nfs4_get_renew_cred,
9732         .renew_lease = nfs4_proc_renew,
9733 };
9734
9735 #if defined(CONFIG_NFS_V4_1)
9736 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
9737         .sched_state_renewal = nfs41_proc_async_sequence,
9738         .get_state_renewal_cred = nfs4_get_machine_cred,
9739         .renew_lease = nfs4_proc_sequence,
9740 };
9741 #endif
9742
9743 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
9744         .get_locations = _nfs40_proc_get_locations,
9745         .fsid_present = _nfs40_proc_fsid_present,
9746 };
9747
9748 #if defined(CONFIG_NFS_V4_1)
9749 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
9750         .get_locations = _nfs41_proc_get_locations,
9751         .fsid_present = _nfs41_proc_fsid_present,
9752 };
9753 #endif  /* CONFIG_NFS_V4_1 */
9754
9755 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
9756         .minor_version = 0,
9757         .init_caps = NFS_CAP_READDIRPLUS
9758                 | NFS_CAP_ATOMIC_OPEN
9759                 | NFS_CAP_POSIX_LOCK,
9760         .init_client = nfs40_init_client,
9761         .shutdown_client = nfs40_shutdown_client,
9762         .match_stateid = nfs4_match_stateid,
9763         .find_root_sec = nfs4_find_root_sec,
9764         .free_lock_state = nfs4_release_lockowner,
9765         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
9766         .alloc_seqid = nfs_alloc_seqid,
9767         .call_sync_ops = &nfs40_call_sync_ops,
9768         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
9769         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
9770         .state_renewal_ops = &nfs40_state_renewal_ops,
9771         .mig_recovery_ops = &nfs40_mig_recovery_ops,
9772 };
9773
9774 #if defined(CONFIG_NFS_V4_1)
9775 static struct nfs_seqid *
9776 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
9777 {
9778         return NULL;
9779 }
9780
9781 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
9782         .minor_version = 1,
9783         .init_caps = NFS_CAP_READDIRPLUS
9784                 | NFS_CAP_ATOMIC_OPEN
9785                 | NFS_CAP_POSIX_LOCK
9786                 | NFS_CAP_STATEID_NFSV41
9787                 | NFS_CAP_ATOMIC_OPEN_V1
9788                 | NFS_CAP_LGOPEN,
9789         .init_client = nfs41_init_client,
9790         .shutdown_client = nfs41_shutdown_client,
9791         .match_stateid = nfs41_match_stateid,
9792         .find_root_sec = nfs41_find_root_sec,
9793         .free_lock_state = nfs41_free_lock_state,
9794         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
9795         .alloc_seqid = nfs_alloc_no_seqid,
9796         .session_trunk = nfs4_test_session_trunk,
9797         .call_sync_ops = &nfs41_call_sync_ops,
9798         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
9799         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
9800         .state_renewal_ops = &nfs41_state_renewal_ops,
9801         .mig_recovery_ops = &nfs41_mig_recovery_ops,
9802 };
9803 #endif
9804
9805 #if defined(CONFIG_NFS_V4_2)
9806 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
9807         .minor_version = 2,
9808         .init_caps = NFS_CAP_READDIRPLUS
9809                 | NFS_CAP_ATOMIC_OPEN
9810                 | NFS_CAP_POSIX_LOCK
9811                 | NFS_CAP_STATEID_NFSV41
9812                 | NFS_CAP_ATOMIC_OPEN_V1
9813                 | NFS_CAP_LGOPEN
9814                 | NFS_CAP_ALLOCATE
9815                 | NFS_CAP_COPY
9816                 | NFS_CAP_OFFLOAD_CANCEL
9817                 | NFS_CAP_DEALLOCATE
9818                 | NFS_CAP_SEEK
9819                 | NFS_CAP_LAYOUTSTATS
9820                 | NFS_CAP_CLONE
9821                 | NFS_CAP_LAYOUTERROR,
9822         .init_client = nfs41_init_client,
9823         .shutdown_client = nfs41_shutdown_client,
9824         .match_stateid = nfs41_match_stateid,
9825         .find_root_sec = nfs41_find_root_sec,
9826         .free_lock_state = nfs41_free_lock_state,
9827         .call_sync_ops = &nfs41_call_sync_ops,
9828         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
9829         .alloc_seqid = nfs_alloc_no_seqid,
9830         .session_trunk = nfs4_test_session_trunk,
9831         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
9832         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
9833         .state_renewal_ops = &nfs41_state_renewal_ops,
9834         .mig_recovery_ops = &nfs41_mig_recovery_ops,
9835 };
9836 #endif
9837
9838 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
9839         [0] = &nfs_v4_0_minor_ops,
9840 #if defined(CONFIG_NFS_V4_1)
9841         [1] = &nfs_v4_1_minor_ops,
9842 #endif
9843 #if defined(CONFIG_NFS_V4_2)
9844         [2] = &nfs_v4_2_minor_ops,
9845 #endif
9846 };
9847
9848 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
9849 {
9850         ssize_t error, error2;
9851
9852         error = generic_listxattr(dentry, list, size);
9853         if (error < 0)
9854                 return error;
9855         if (list) {
9856                 list += error;
9857                 size -= error;
9858         }
9859
9860         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
9861         if (error2 < 0)
9862                 return error2;
9863         return error + error2;
9864 }
9865
9866 static const struct inode_operations nfs4_dir_inode_operations = {
9867         .create         = nfs_create,
9868         .lookup         = nfs_lookup,
9869         .atomic_open    = nfs_atomic_open,
9870         .link           = nfs_link,
9871         .unlink         = nfs_unlink,
9872         .symlink        = nfs_symlink,
9873         .mkdir          = nfs_mkdir,
9874         .rmdir          = nfs_rmdir,
9875         .mknod          = nfs_mknod,
9876         .rename         = nfs_rename,
9877         .permission     = nfs_permission,
9878         .getattr        = nfs_getattr,
9879         .setattr        = nfs_setattr,
9880         .listxattr      = nfs4_listxattr,
9881 };
9882
9883 static const struct inode_operations nfs4_file_inode_operations = {
9884         .permission     = nfs_permission,
9885         .getattr        = nfs_getattr,
9886         .setattr        = nfs_setattr,
9887         .listxattr      = nfs4_listxattr,
9888 };
9889
9890 const struct nfs_rpc_ops nfs_v4_clientops = {
9891         .version        = 4,                    /* protocol version */
9892         .dentry_ops     = &nfs4_dentry_operations,
9893         .dir_inode_ops  = &nfs4_dir_inode_operations,
9894         .file_inode_ops = &nfs4_file_inode_operations,
9895         .file_ops       = &nfs4_file_operations,
9896         .getroot        = nfs4_proc_get_root,
9897         .submount       = nfs4_submount,
9898         .try_mount      = nfs4_try_mount,
9899         .getattr        = nfs4_proc_getattr,
9900         .setattr        = nfs4_proc_setattr,
9901         .lookup         = nfs4_proc_lookup,
9902         .lookupp        = nfs4_proc_lookupp,
9903         .access         = nfs4_proc_access,
9904         .readlink       = nfs4_proc_readlink,
9905         .create         = nfs4_proc_create,
9906         .remove         = nfs4_proc_remove,
9907         .unlink_setup   = nfs4_proc_unlink_setup,
9908         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
9909         .unlink_done    = nfs4_proc_unlink_done,
9910         .rename_setup   = nfs4_proc_rename_setup,
9911         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
9912         .rename_done    = nfs4_proc_rename_done,
9913         .link           = nfs4_proc_link,
9914         .symlink        = nfs4_proc_symlink,
9915         .mkdir          = nfs4_proc_mkdir,
9916         .rmdir          = nfs4_proc_rmdir,
9917         .readdir        = nfs4_proc_readdir,
9918         .mknod          = nfs4_proc_mknod,
9919         .statfs         = nfs4_proc_statfs,
9920         .fsinfo         = nfs4_proc_fsinfo,
9921         .pathconf       = nfs4_proc_pathconf,
9922         .set_capabilities = nfs4_server_capabilities,
9923         .decode_dirent  = nfs4_decode_dirent,
9924         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
9925         .read_setup     = nfs4_proc_read_setup,
9926         .read_done      = nfs4_read_done,
9927         .write_setup    = nfs4_proc_write_setup,
9928         .write_done     = nfs4_write_done,
9929         .commit_setup   = nfs4_proc_commit_setup,
9930         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
9931         .commit_done    = nfs4_commit_done,
9932         .lock           = nfs4_proc_lock,
9933         .clear_acl_cache = nfs4_zap_acl_attr,
9934         .close_context  = nfs4_close_context,
9935         .open_context   = nfs4_atomic_open,
9936         .have_delegation = nfs4_have_delegation,
9937         .alloc_client   = nfs4_alloc_client,
9938         .init_client    = nfs4_init_client,
9939         .free_client    = nfs4_free_client,
9940         .create_server  = nfs4_create_server,
9941         .clone_server   = nfs_clone_server,
9942 };
9943
9944 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
9945         .name   = XATTR_NAME_NFSV4_ACL,
9946         .list   = nfs4_xattr_list_nfs4_acl,
9947         .get    = nfs4_xattr_get_nfs4_acl,
9948         .set    = nfs4_xattr_set_nfs4_acl,
9949 };
9950
9951 const struct xattr_handler *nfs4_xattr_handlers[] = {
9952         &nfs4_xattr_nfs4_acl_handler,
9953 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
9954         &nfs4_xattr_nfs4_label_handler,
9955 #endif
9956         NULL
9957 };
9958
9959 /*
9960  * Local variables:
9961  *  c-basic-offset: 8
9962  * End:
9963  */