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/file.h>
  42 #include <linux/string.h>
  43 #include <linux/ratelimit.h>
  44 #include <linux/printk.h>
  45 #include <linux/slab.h>
  46 #include <linux/sunrpc/clnt.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.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_POLL_RETRY_MIN     (HZ/10)
  75 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  76
  77 /* file attributes which can be mapped to nfs attributes */
  78 #define NFS4_VALID_ATTRS (ATTR_MODE \
  79         | ATTR_UID \
  80         | ATTR_GID \
  81         | ATTR_SIZE \
  82         | ATTR_ATIME \
  83         | ATTR_MTIME \
  84         | ATTR_CTIME \
  85         | ATTR_ATIME_SET \
  86         | ATTR_MTIME_SET)
  87
  88 struct nfs4_opendata;
  89 static int _nfs4_proc_open(struct nfs4_opendata *data);
  90 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  91 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  92 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  93 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  94 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  95 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  96                             struct nfs_fattr *fattr, struct iattr *sattr,
  97                             struct nfs4_state *state, struct nfs4_label *ilabel,
  98                             struct nfs4_label *olabel);
  99 #ifdef CONFIG_NFS_V4_1
 100 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 101                 struct rpc_cred *);
 102 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
 103                 struct rpc_cred *);
 104 #endif
 105
 106 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 107 static inline struct nfs4_label *
 108 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 109         struct iattr *sattr, struct nfs4_label *label)
 110 {
 111         int err;
 112
 113         if (label == NULL)
 114                 return NULL;
 115
 116         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 117                 return NULL;
 118
 119         err = security_dentry_init_security(dentry, sattr->ia_mode,
 120                                 &dentry->d_name, (void **)&label->label, &label->len);
 121         if (err == 0)
 122                 return label;
 123
 124         return NULL;
 125 }
 126 static inline void
 127 nfs4_label_release_security(struct nfs4_label *label)
 128 {
 129         if (label)
 130                 security_release_secctx(label->label, label->len);
 131 }
 132 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 133 {
 134         if (label)
 135                 return server->attr_bitmask;
 136
 137         return server->attr_bitmask_nl;
 138 }
 139 #else
 140 static inline struct nfs4_label *
 141 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 142         struct iattr *sattr, struct nfs4_label *l)
 143 { return NULL; }
 144 static inline void
 145 nfs4_label_release_security(struct nfs4_label *label)
 146 { return; }
 147 static inline u32 *
 148 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 149 { return server->attr_bitmask; }
 150 #endif
 151
 152 /* Prevent leaks of NFSv4 errors into userland */
 153 static int nfs4_map_errors(int err)
 154 {
 155         if (err >= -1000)
 156                 return err;
 157         switch (err) {
 158         case -NFS4ERR_RESOURCE:
 159         case -NFS4ERR_LAYOUTTRYLATER:
 160         case -NFS4ERR_RECALLCONFLICT:
 161                 return -EREMOTEIO;
 162         case -NFS4ERR_WRONGSEC:
 163         case -NFS4ERR_WRONG_CRED:
 164                 return -EPERM;
 165         case -NFS4ERR_BADOWNER:
 166         case -NFS4ERR_BADNAME:
 167                 return -EINVAL;
 168         case -NFS4ERR_SHARE_DENIED:
 169                 return -EACCES;
 170         case -NFS4ERR_MINOR_VERS_MISMATCH:
 171                 return -EPROTONOSUPPORT;
 172         case -NFS4ERR_FILE_OPEN:
 173                 return -EBUSY;
 174         default:
 175                 dprintk("%s could not handle NFSv4 error %d\n",
 176                                 __func__, -err);
 177                 break;
 178         }
 179         return -EIO;
 180 }
 181
 182 /*
 183  * This is our standard bitmap for GETATTR requests.
 184  */
 185 const u32 nfs4_fattr_bitmap[3] = {
 186         FATTR4_WORD0_TYPE
 187         | FATTR4_WORD0_CHANGE
 188         | FATTR4_WORD0_SIZE
 189         | FATTR4_WORD0_FSID
 190         | FATTR4_WORD0_FILEID,
 191         FATTR4_WORD1_MODE
 192         | FATTR4_WORD1_NUMLINKS
 193         | FATTR4_WORD1_OWNER
 194         | FATTR4_WORD1_OWNER_GROUP
 195         | FATTR4_WORD1_RAWDEV
 196         | FATTR4_WORD1_SPACE_USED
 197         | FATTR4_WORD1_TIME_ACCESS
 198         | FATTR4_WORD1_TIME_METADATA
 199         | FATTR4_WORD1_TIME_MODIFY
 200         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 201 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 202         FATTR4_WORD2_SECURITY_LABEL
 203 #endif
 204 };
 205
 206 static const u32 nfs4_pnfs_open_bitmap[3] = {
 207         FATTR4_WORD0_TYPE
 208         | FATTR4_WORD0_CHANGE
 209         | FATTR4_WORD0_SIZE
 210         | FATTR4_WORD0_FSID
 211         | FATTR4_WORD0_FILEID,
 212         FATTR4_WORD1_MODE
 213         | FATTR4_WORD1_NUMLINKS
 214         | FATTR4_WORD1_OWNER
 215         | FATTR4_WORD1_OWNER_GROUP
 216         | FATTR4_WORD1_RAWDEV
 217         | FATTR4_WORD1_SPACE_USED
 218         | FATTR4_WORD1_TIME_ACCESS
 219         | FATTR4_WORD1_TIME_METADATA
 220         | FATTR4_WORD1_TIME_MODIFY,
 221         FATTR4_WORD2_MDSTHRESHOLD
 222 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 223         | FATTR4_WORD2_SECURITY_LABEL
 224 #endif
 225 };
 226
 227 static const u32 nfs4_open_noattr_bitmap[3] = {
 228         FATTR4_WORD0_TYPE
 229         | FATTR4_WORD0_CHANGE
 230         | FATTR4_WORD0_FILEID,
 231 };
 232
 233 const u32 nfs4_statfs_bitmap[3] = {
 234         FATTR4_WORD0_FILES_AVAIL
 235         | FATTR4_WORD0_FILES_FREE
 236         | FATTR4_WORD0_FILES_TOTAL,
 237         FATTR4_WORD1_SPACE_AVAIL
 238         | FATTR4_WORD1_SPACE_FREE
 239         | FATTR4_WORD1_SPACE_TOTAL
 240 };
 241
 242 const u32 nfs4_pathconf_bitmap[3] = {
 243         FATTR4_WORD0_MAXLINK
 244         | FATTR4_WORD0_MAXNAME,
 245         0
 246 };
 247
 248 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 249                         | FATTR4_WORD0_MAXREAD
 250                         | FATTR4_WORD0_MAXWRITE
 251                         | FATTR4_WORD0_LEASE_TIME,
 252                         FATTR4_WORD1_TIME_DELTA
 253                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 254                         FATTR4_WORD2_LAYOUT_BLKSIZE
 255                         | FATTR4_WORD2_CLONE_BLKSIZE
 256 };
 257
 258 const u32 nfs4_fs_locations_bitmap[3] = {
 259         FATTR4_WORD0_TYPE
 260         | FATTR4_WORD0_CHANGE
 261         | FATTR4_WORD0_SIZE
 262         | FATTR4_WORD0_FSID
 263         | FATTR4_WORD0_FILEID
 264         | FATTR4_WORD0_FS_LOCATIONS,
 265         FATTR4_WORD1_MODE
 266         | FATTR4_WORD1_NUMLINKS
 267         | FATTR4_WORD1_OWNER
 268         | FATTR4_WORD1_OWNER_GROUP
 269         | FATTR4_WORD1_RAWDEV
 270         | FATTR4_WORD1_SPACE_USED
 271         | FATTR4_WORD1_TIME_ACCESS
 272         | FATTR4_WORD1_TIME_METADATA
 273         | FATTR4_WORD1_TIME_MODIFY
 274         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 275 };
 276
 277 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 278                 struct nfs4_readdir_arg *readdir)
 279 {
 280         __be32 *start, *p;
 281
 282         if (cookie > 2) {
 283                 readdir->cookie = cookie;
 284                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 285                 return;
 286         }
 287
 288         readdir->cookie = 0;
 289         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 290         if (cookie == 2)
 291                 return;
 292
 293         /*
 294          * NFSv4 servers do not return entries for '.' and '..'
 295          * Therefore, we fake these entries here.  We let '.'
 296          * have cookie 0 and '..' have cookie 1.  Note that
 297          * when talking to the server, we always send cookie 0
 298          * instead of 1 or 2.
 299          */
 300         start = p = kmap_atomic(*readdir->pages);
 301
 302         if (cookie == 0) {
 303                 *p++ = xdr_one;                                  /* next */
 304                 *p++ = xdr_zero;                   /* cookie, first word */
 305                 *p++ = xdr_one;                   /* cookie, second word */
 306                 *p++ = xdr_one;                             /* entry len */
 307                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 308                 p++;
 309                 *p++ = xdr_one;                         /* bitmap length */
 310                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 311                 *p++ = htonl(8);              /* attribute buffer length */
 312                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 313         }
 314
 315         *p++ = xdr_one;                                  /* next */
 316         *p++ = xdr_zero;                   /* cookie, first word */
 317         *p++ = xdr_two;                   /* cookie, second word */
 318         *p++ = xdr_two;                             /* entry len */
 319         memcpy(p, "..\0\0", 4);                         /* entry */
 320         p++;
 321         *p++ = xdr_one;                         /* bitmap length */
 322         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 323         *p++ = htonl(8);              /* attribute buffer length */
 324         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 325
 326         readdir->pgbase = (char *)p - (char *)start;
 327         readdir->count -= readdir->pgbase;
 328         kunmap_atomic(start);
 329 }
 330
 331 static long nfs4_update_delay(long *timeout)
 332 {
 333         long ret;
 334         if (!timeout)
 335                 return NFS4_POLL_RETRY_MAX;
 336         if (*timeout <= 0)
 337                 *timeout = NFS4_POLL_RETRY_MIN;
 338         if (*timeout > NFS4_POLL_RETRY_MAX)
 339                 *timeout = NFS4_POLL_RETRY_MAX;
 340         ret = *timeout;
 341         *timeout <<= 1;
 342         return ret;
 343 }
 344
 345 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 346 {
 347         int res = 0;
 348
 349         might_sleep();
 350
 351         freezable_schedule_timeout_killable_unsafe(
 352                 nfs4_update_delay(timeout));
 353         if (fatal_signal_pending(current))
 354                 res = -ERESTARTSYS;
 355         return res;
 356 }
 357
 358 /* This is the error handling routine for processes that are allowed
 359  * to sleep.
 360  */
 361 static int nfs4_do_handle_exception(struct nfs_server *server,
 362                 int errorcode, struct nfs4_exception *exception)
 363 {
 364         struct nfs_client *clp = server->nfs_client;
 365         struct nfs4_state *state = exception->state;
 366         struct inode *inode = exception->inode;
 367         int ret = errorcode;
 368
 369         exception->delay = 0;
 370         exception->recovering = 0;
 371         exception->retry = 0;
 372         switch(errorcode) {
 373                 case 0:
 374                         return 0;
 375                 case -NFS4ERR_OPENMODE:
 376                 case -NFS4ERR_DELEG_REVOKED:
 377                 case -NFS4ERR_ADMIN_REVOKED:
 378                 case -NFS4ERR_BAD_STATEID:
 379                         if (inode && nfs_async_inode_return_delegation(inode,
 380                                                 NULL) == 0)
 381                                 goto wait_on_recovery;
 382                         if (state == NULL)
 383                                 break;
 384                         ret = nfs4_schedule_stateid_recovery(server, state);
 385                         if (ret < 0)
 386                                 break;
 387                         goto wait_on_recovery;
 388                 case -NFS4ERR_EXPIRED:
 389                         if (state != NULL) {
 390                                 ret = nfs4_schedule_stateid_recovery(server, state);
 391                                 if (ret < 0)
 392                                         break;
 393                         }
 394                 case -NFS4ERR_STALE_STATEID:
 395                 case -NFS4ERR_STALE_CLIENTID:
 396                         nfs4_schedule_lease_recovery(clp);
 397                         goto wait_on_recovery;
 398                 case -NFS4ERR_MOVED:
 399                         ret = nfs4_schedule_migration_recovery(server);
 400                         if (ret < 0)
 401                                 break;
 402                         goto wait_on_recovery;
 403                 case -NFS4ERR_LEASE_MOVED:
 404                         nfs4_schedule_lease_moved_recovery(clp);
 405                         goto wait_on_recovery;
 406 #if defined(CONFIG_NFS_V4_1)
 407                 case -NFS4ERR_BADSESSION:
 408                 case -NFS4ERR_BADSLOT:
 409                 case -NFS4ERR_BAD_HIGH_SLOT:
 410                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 411                 case -NFS4ERR_DEADSESSION:
 412                 case -NFS4ERR_SEQ_FALSE_RETRY:
 413                 case -NFS4ERR_SEQ_MISORDERED:
 414                         dprintk("%s ERROR: %d Reset session\n", __func__,
 415                                 errorcode);
 416                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 417                         goto wait_on_recovery;
 418 #endif /* defined(CONFIG_NFS_V4_1) */
 419                 case -NFS4ERR_FILE_OPEN:
 420                         if (exception->timeout > HZ) {
 421                                 /* We have retried a decent amount, time to
 422                                  * fail
 423                                  */
 424                                 ret = -EBUSY;
 425                                 break;
 426                         }
 427                 case -NFS4ERR_DELAY:
 428                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 429                 case -NFS4ERR_GRACE:
 430                 case -NFS4ERR_RECALLCONFLICT:
 431                         exception->delay = 1;
 432                         return 0;
 433
 434                 case -NFS4ERR_RETRY_UNCACHED_REP:
 435                 case -NFS4ERR_OLD_STATEID:
 436                         exception->retry = 1;
 437                         break;
 438                 case -NFS4ERR_BADOWNER:
 439                         /* The following works around a Linux server bug! */
 440                 case -NFS4ERR_BADNAME:
 441                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 442                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 443                                 exception->retry = 1;
 444                                 printk(KERN_WARNING "NFS: v4 server %s "
 445                                                 "does not accept raw "
 446                                                 "uid/gids. "
 447                                                 "Reenabling the idmapper.\n",
 448                                                 server->nfs_client->cl_hostname);
 449                         }
 450         }
 451         /* We failed to handle the error */
 452         return nfs4_map_errors(ret);
 453 wait_on_recovery:
 454         exception->recovering = 1;
 455         return 0;
 456 }
 457
 458 /* This is the error handling routine for processes that are allowed
 459  * to sleep.
 460  */
 461 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 462 {
 463         struct nfs_client *clp = server->nfs_client;
 464         int ret;
 465
 466         ret = nfs4_do_handle_exception(server, errorcode, exception);
 467         if (exception->delay) {
 468                 ret = nfs4_delay(server->client, &exception->timeout);
 469                 goto out_retry;
 470         }
 471         if (exception->recovering) {
 472                 ret = nfs4_wait_clnt_recover(clp);
 473                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 474                         return -EIO;
 475                 goto out_retry;
 476         }
 477         return ret;
 478 out_retry:
 479         if (ret == 0)
 480                 exception->retry = 1;
 481         return ret;
 482 }
 483
 484 static int
 485 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 486                 int errorcode, struct nfs4_exception *exception)
 487 {
 488         struct nfs_client *clp = server->nfs_client;
 489         int ret;
 490
 491         ret = nfs4_do_handle_exception(server, errorcode, exception);
 492         if (exception->delay) {
 493                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 494                 goto out_retry;
 495         }
 496         if (exception->recovering) {
 497                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 498                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 499                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 500                 goto out_retry;
 501         }
 502         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 503                 ret = -EIO;
 504         return ret;
 505 out_retry:
 506         if (ret == 0)
 507                 exception->retry = 1;
 508         return ret;
 509 }
 510
 511 static int
 512 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 513                         struct nfs4_state *state, long *timeout)
 514 {
 515         struct nfs4_exception exception = {
 516                 .state = state,
 517         };
 518
 519         if (task->tk_status >= 0)
 520                 return 0;
 521         if (timeout)
 522                 exception.timeout = *timeout;
 523         task->tk_status = nfs4_async_handle_exception(task, server,
 524                         task->tk_status,
 525                         &exception);
 526         if (exception.delay && timeout)
 527                 *timeout = exception.timeout;
 528         if (exception.retry)
 529                 return -EAGAIN;
 530         return 0;
 531 }
 532
 533 /*
 534  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 535  * or 'false' otherwise.
 536  */
 537 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 538 {
 539         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 540
 541         if (flavor == RPC_AUTH_GSS_KRB5I ||
 542             flavor == RPC_AUTH_GSS_KRB5P)
 543                 return true;
 544
 545         return false;
 546 }
 547
 548 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 549 {
 550         spin_lock(&clp->cl_lock);
 551         if (time_before(clp->cl_last_renewal,timestamp))
 552                 clp->cl_last_renewal = timestamp;
 553         spin_unlock(&clp->cl_lock);
 554 }
 555
 556 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 557 {
 558         struct nfs_client *clp = server->nfs_client;
 559
 560         if (!nfs4_has_session(clp))
 561                 do_renew_lease(clp, timestamp);
 562 }
 563
 564 struct nfs4_call_sync_data {
 565         const struct nfs_server *seq_server;
 566         struct nfs4_sequence_args *seq_args;
 567         struct nfs4_sequence_res *seq_res;
 568 };
 569
 570 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 571                         struct nfs4_sequence_res *res, int cache_reply)
 572 {
 573         args->sa_slot = NULL;
 574         args->sa_cache_this = cache_reply;
 575         args->sa_privileged = 0;
 576
 577         res->sr_slot = NULL;
 578 }
 579
 580 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 581 {
 582         args->sa_privileged = 1;
 583 }
 584
 585 int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 586                          struct nfs4_sequence_args *args,
 587                          struct nfs4_sequence_res *res,
 588                          struct rpc_task *task)
 589 {
 590         struct nfs4_slot *slot;
 591
 592         /* slot already allocated? */
 593         if (res->sr_slot != NULL)
 594                 goto out_start;
 595
 596         spin_lock(&tbl->slot_tbl_lock);
 597         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 598                 goto out_sleep;
 599
 600         slot = nfs4_alloc_slot(tbl);
 601         if (IS_ERR(slot)) {
 602                 if (slot == ERR_PTR(-ENOMEM))
 603                         task->tk_timeout = HZ >> 2;
 604                 goto out_sleep;
 605         }
 606         spin_unlock(&tbl->slot_tbl_lock);
 607
 608         args->sa_slot = slot;
 609         res->sr_slot = slot;
 610
 611 out_start:
 612         rpc_call_start(task);
 613         return 0;
 614
 615 out_sleep:
 616         if (args->sa_privileged)
 617                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 618                                 NULL, RPC_PRIORITY_PRIVILEGED);
 619         else
 620                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 621         spin_unlock(&tbl->slot_tbl_lock);
 622         return -EAGAIN;
 623 }
 624 EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
 625
 626 static int nfs40_sequence_done(struct rpc_task *task,
 627                                struct nfs4_sequence_res *res)
 628 {
 629         struct nfs4_slot *slot = res->sr_slot;
 630         struct nfs4_slot_table *tbl;
 631
 632         if (slot == NULL)
 633                 goto out;
 634
 635         tbl = slot->table;
 636         spin_lock(&tbl->slot_tbl_lock);
 637         if (!nfs41_wake_and_assign_slot(tbl, slot))
 638                 nfs4_free_slot(tbl, slot);
 639         spin_unlock(&tbl->slot_tbl_lock);
 640
 641         res->sr_slot = NULL;
 642 out:
 643         return 1;
 644 }
 645
 646 #if defined(CONFIG_NFS_V4_1)
 647
 648 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 649 {
 650         struct nfs4_session *session;
 651         struct nfs4_slot_table *tbl;
 652         struct nfs4_slot *slot = res->sr_slot;
 653         bool send_new_highest_used_slotid = false;
 654
 655         tbl = slot->table;
 656         session = tbl->session;
 657
 658         spin_lock(&tbl->slot_tbl_lock);
 659         /* Be nice to the server: try to ensure that the last transmitted
 660          * value for highest_user_slotid <= target_highest_slotid
 661          */
 662         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 663                 send_new_highest_used_slotid = true;
 664
 665         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 666                 send_new_highest_used_slotid = false;
 667                 goto out_unlock;
 668         }
 669         nfs4_free_slot(tbl, slot);
 670
 671         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 672                 send_new_highest_used_slotid = false;
 673 out_unlock:
 674         spin_unlock(&tbl->slot_tbl_lock);
 675         res->sr_slot = NULL;
 676         if (send_new_highest_used_slotid)
 677                 nfs41_notify_server(session->clp);
 678 }
 679
 680 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 681 {
 682         struct nfs4_session *session;
 683         struct nfs4_slot *slot = res->sr_slot;
 684         struct nfs_client *clp;
 685         bool interrupted = false;
 686         int ret = 1;
 687
 688         if (slot == NULL)
 689                 goto out_noaction;
 690         /* don't increment the sequence number if the task wasn't sent */
 691         if (!RPC_WAS_SENT(task))
 692                 goto out;
 693
 694         session = slot->table->session;
 695
 696         if (slot->interrupted) {
 697                 slot->interrupted = 0;
 698                 interrupted = true;
 699         }
 700
 701         trace_nfs4_sequence_done(session, res);
 702         /* Check the SEQUENCE operation status */
 703         switch (res->sr_status) {
 704         case 0:
 705                 /* Update the slot's sequence and clientid lease timer */
 706                 ++slot->seq_nr;
 707                 clp = session->clp;
 708                 do_renew_lease(clp, res->sr_timestamp);
 709                 /* Check sequence flags */
 710                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 711                 nfs41_update_target_slotid(slot->table, slot, res);
 712                 break;
 713         case 1:
 714                 /*
 715                  * sr_status remains 1 if an RPC level error occurred.
 716                  * The server may or may not have processed the sequence
 717                  * operation..
 718                  * Mark the slot as having hosted an interrupted RPC call.
 719                  */
 720                 slot->interrupted = 1;
 721                 goto out;
 722         case -NFS4ERR_DELAY:
 723                 /* The server detected a resend of the RPC call and
 724                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 725                  * of RFC5661.
 726                  */
 727                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 728                         __func__,
 729                         slot->slot_nr,
 730                         slot->seq_nr);
 731                 goto out_retry;
 732         case -NFS4ERR_BADSLOT:
 733                 /*
 734                  * The slot id we used was probably retired. Try again
 735                  * using a different slot id.
 736                  */
 737                 goto retry_nowait;
 738         case -NFS4ERR_SEQ_MISORDERED:
 739                 /*
 740                  * Was the last operation on this sequence interrupted?
 741                  * If so, retry after bumping the sequence number.
 742                  */
 743                 if (interrupted) {
 744                         ++slot->seq_nr;
 745                         goto retry_nowait;
 746                 }
 747                 /*
 748                  * Could this slot have been previously retired?
 749                  * If so, then the server may be expecting seq_nr = 1!
 750                  */
 751                 if (slot->seq_nr != 1) {
 752                         slot->seq_nr = 1;
 753                         goto retry_nowait;
 754                 }
 755                 break;
 756         case -NFS4ERR_SEQ_FALSE_RETRY:
 757                 ++slot->seq_nr;
 758                 goto retry_nowait;
 759         default:
 760                 /* Just update the slot sequence no. */
 761                 ++slot->seq_nr;
 762         }
 763 out:
 764         /* The session may be reset by one of the error handlers. */
 765         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 766         nfs41_sequence_free_slot(res);
 767 out_noaction:
 768         return ret;
 769 retry_nowait:
 770         if (rpc_restart_call_prepare(task)) {
 771                 task->tk_status = 0;
 772                 ret = 0;
 773         }
 774         goto out;
 775 out_retry:
 776         if (!rpc_restart_call(task))
 777                 goto out;
 778         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 779         return 0;
 780 }
 781 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 782
 783 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 784 {
 785         if (res->sr_slot == NULL)
 786                 return 1;
 787         if (!res->sr_slot->table->session)
 788                 return nfs40_sequence_done(task, res);
 789         return nfs41_sequence_done(task, res);
 790 }
 791 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 792
 793 int nfs41_setup_sequence(struct nfs4_session *session,
 794                                 struct nfs4_sequence_args *args,
 795                                 struct nfs4_sequence_res *res,
 796                                 struct rpc_task *task)
 797 {
 798         struct nfs4_slot *slot;
 799         struct nfs4_slot_table *tbl;
 800
 801         dprintk("--> %s\n", __func__);
 802         /* slot already allocated? */
 803         if (res->sr_slot != NULL)
 804                 goto out_success;
 805
 806         tbl = &session->fc_slot_table;
 807
 808         task->tk_timeout = 0;
 809
 810         spin_lock(&tbl->slot_tbl_lock);
 811         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 812             !args->sa_privileged) {
 813                 /* The state manager will wait until the slot table is empty */
 814                 dprintk("%s session is draining\n", __func__);
 815                 goto out_sleep;
 816         }
 817
 818         slot = nfs4_alloc_slot(tbl);
 819         if (IS_ERR(slot)) {
 820                 /* If out of memory, try again in 1/4 second */
 821                 if (slot == ERR_PTR(-ENOMEM))
 822                         task->tk_timeout = HZ >> 2;
 823                 dprintk("<-- %s: no free slots\n", __func__);
 824                 goto out_sleep;
 825         }
 826         spin_unlock(&tbl->slot_tbl_lock);
 827
 828         args->sa_slot = slot;
 829
 830         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 831                         slot->slot_nr, slot->seq_nr);
 832
 833         res->sr_slot = slot;
 834         res->sr_timestamp = jiffies;
 835         res->sr_status_flags = 0;
 836         /*
 837          * sr_status is only set in decode_sequence, and so will remain
 838          * set to 1 if an rpc level failure occurs.
 839          */
 840         res->sr_status = 1;
 841         trace_nfs4_setup_sequence(session, args);
 842 out_success:
 843         rpc_call_start(task);
 844         return 0;
 845 out_sleep:
 846         /* Privileged tasks are queued with top priority */
 847         if (args->sa_privileged)
 848                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 849                                 NULL, RPC_PRIORITY_PRIVILEGED);
 850         else
 851                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 852         spin_unlock(&tbl->slot_tbl_lock);
 853         return -EAGAIN;
 854 }
 855 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 856
 857 static int nfs4_setup_sequence(const struct nfs_server *server,
 858                                struct nfs4_sequence_args *args,
 859                                struct nfs4_sequence_res *res,
 860                                struct rpc_task *task)
 861 {
 862         struct nfs4_session *session = nfs4_get_session(server);
 863         int ret = 0;
 864
 865         if (!session)
 866                 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 867                                             args, res, task);
 868
 869         dprintk("--> %s clp %p session %p sr_slot %u\n",
 870                 __func__, session->clp, session, res->sr_slot ?
 871                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 872
 873         ret = nfs41_setup_sequence(session, args, res, task);
 874
 875         dprintk("<-- %s status=%d\n", __func__, ret);
 876         return ret;
 877 }
 878
 879 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 880 {
 881         struct nfs4_call_sync_data *data = calldata;
 882         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 883
 884         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 885
 886         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 887 }
 888
 889 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 890 {
 891         struct nfs4_call_sync_data *data = calldata;
 892
 893         nfs41_sequence_done(task, data->seq_res);
 894 }
 895
 896 static const struct rpc_call_ops nfs41_call_sync_ops = {
 897         .rpc_call_prepare = nfs41_call_sync_prepare,
 898         .rpc_call_done = nfs41_call_sync_done,
 899 };
 900
 901 #else   /* !CONFIG_NFS_V4_1 */
 902
 903 static int nfs4_setup_sequence(const struct nfs_server *server,
 904                                struct nfs4_sequence_args *args,
 905                                struct nfs4_sequence_res *res,
 906                                struct rpc_task *task)
 907 {
 908         return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 909                                     args, res, task);
 910 }
 911
 912 int nfs4_sequence_done(struct rpc_task *task,
 913                        struct nfs4_sequence_res *res)
 914 {
 915         return nfs40_sequence_done(task, res);
 916 }
 917 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 918
 919 #endif  /* !CONFIG_NFS_V4_1 */
 920
 921 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 922 {
 923         struct nfs4_call_sync_data *data = calldata;
 924         nfs4_setup_sequence(data->seq_server,
 925                                 data->seq_args, data->seq_res, task);
 926 }
 927
 928 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 929 {
 930         struct nfs4_call_sync_data *data = calldata;
 931         nfs4_sequence_done(task, data->seq_res);
 932 }
 933
 934 static const struct rpc_call_ops nfs40_call_sync_ops = {
 935         .rpc_call_prepare = nfs40_call_sync_prepare,
 936         .rpc_call_done = nfs40_call_sync_done,
 937 };
 938
 939 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 940                                    struct nfs_server *server,
 941                                    struct rpc_message *msg,
 942                                    struct nfs4_sequence_args *args,
 943                                    struct nfs4_sequence_res *res)
 944 {
 945         int ret;
 946         struct rpc_task *task;
 947         struct nfs_client *clp = server->nfs_client;
 948         struct nfs4_call_sync_data data = {
 949                 .seq_server = server,
 950                 .seq_args = args,
 951                 .seq_res = res,
 952         };
 953         struct rpc_task_setup task_setup = {
 954                 .rpc_client = clnt,
 955                 .rpc_message = msg,
 956                 .callback_ops = clp->cl_mvops->call_sync_ops,
 957                 .callback_data = &data
 958         };
 959
 960         task = rpc_run_task(&task_setup);
 961         if (IS_ERR(task))
 962                 ret = PTR_ERR(task);
 963         else {
 964                 ret = task->tk_status;
 965                 rpc_put_task(task);
 966         }
 967         return ret;
 968 }
 969
 970 int nfs4_call_sync(struct rpc_clnt *clnt,
 971                    struct nfs_server *server,
 972                    struct rpc_message *msg,
 973                    struct nfs4_sequence_args *args,
 974                    struct nfs4_sequence_res *res,
 975                    int cache_reply)
 976 {
 977         nfs4_init_sequence(args, res, cache_reply);
 978         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 979 }
 980
 981 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 982 {
 983         struct nfs_inode *nfsi = NFS_I(dir);
 984
 985         spin_lock(&dir->i_lock);
 986         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 987         if (!cinfo->atomic || cinfo->before != dir->i_version)
 988                 nfs_force_lookup_revalidate(dir);
 989         dir->i_version = cinfo->after;
 990         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
 991         nfs_fscache_invalidate(dir);
 992         spin_unlock(&dir->i_lock);
 993 }
 994
 995 struct nfs4_opendata {
 996         struct kref kref;
 997         struct nfs_openargs o_arg;
 998         struct nfs_openres o_res;
 999         struct nfs_open_confirmargs c_arg;
1000         struct nfs_open_confirmres c_res;
1001         struct nfs4_string owner_name;
1002         struct nfs4_string group_name;
1003         struct nfs4_label *a_label;
1004         struct nfs_fattr f_attr;
1005         struct nfs4_label *f_label;
1006         struct dentry *dir;
1007         struct dentry *dentry;
1008         struct nfs4_state_owner *owner;
1009         struct nfs4_state *state;
1010         struct iattr attrs;
1011         unsigned long timestamp;
1012         unsigned int rpc_done : 1;
1013         unsigned int file_created : 1;
1014         unsigned int is_recover : 1;
1015         int rpc_status;
1016         int cancelled;
1017 };
1018
1019 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1020                 int err, struct nfs4_exception *exception)
1021 {
1022         if (err != -EINVAL)
1023                 return false;
1024         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1025                 return false;
1026         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1027         exception->retry = 1;
1028         return true;
1029 }
1030
1031 static u32
1032 nfs4_map_atomic_open_share(struct nfs_server *server,
1033                 fmode_t fmode, int openflags)
1034 {
1035         u32 res = 0;
1036
1037         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1038         case FMODE_READ:
1039                 res = NFS4_SHARE_ACCESS_READ;
1040                 break;
1041         case FMODE_WRITE:
1042                 res = NFS4_SHARE_ACCESS_WRITE;
1043                 break;
1044         case FMODE_READ|FMODE_WRITE:
1045                 res = NFS4_SHARE_ACCESS_BOTH;
1046         }
1047         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1048                 goto out;
1049         /* Want no delegation if we're using O_DIRECT */
1050         if (openflags & O_DIRECT)
1051                 res |= NFS4_SHARE_WANT_NO_DELEG;
1052 out:
1053         return res;
1054 }
1055
1056 static enum open_claim_type4
1057 nfs4_map_atomic_open_claim(struct nfs_server *server,
1058                 enum open_claim_type4 claim)
1059 {
1060         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1061                 return claim;
1062         switch (claim) {
1063         default:
1064                 return claim;
1065         case NFS4_OPEN_CLAIM_FH:
1066                 return NFS4_OPEN_CLAIM_NULL;
1067         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1068                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1069         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1070                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1071         }
1072 }
1073
1074 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1075 {
1076         p->o_res.f_attr = &p->f_attr;
1077         p->o_res.f_label = p->f_label;
1078         p->o_res.seqid = p->o_arg.seqid;
1079         p->c_res.seqid = p->c_arg.seqid;
1080         p->o_res.server = p->o_arg.server;
1081         p->o_res.access_request = p->o_arg.access;
1082         nfs_fattr_init(&p->f_attr);
1083         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1084 }
1085
1086 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1087                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1088                 const struct iattr *attrs,
1089                 struct nfs4_label *label,
1090                 enum open_claim_type4 claim,
1091                 gfp_t gfp_mask)
1092 {
1093         struct dentry *parent = dget_parent(dentry);
1094         struct inode *dir = d_inode(parent);
1095         struct nfs_server *server = NFS_SERVER(dir);
1096         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1097         struct nfs4_opendata *p;
1098
1099         p = kzalloc(sizeof(*p), gfp_mask);
1100         if (p == NULL)
1101                 goto err;
1102
1103         p->f_label = nfs4_label_alloc(server, gfp_mask);
1104         if (IS_ERR(p->f_label))
1105                 goto err_free_p;
1106
1107         p->a_label = nfs4_label_alloc(server, gfp_mask);
1108         if (IS_ERR(p->a_label))
1109                 goto err_free_f;
1110
1111         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1112         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1113         if (IS_ERR(p->o_arg.seqid))
1114                 goto err_free_label;
1115         nfs_sb_active(dentry->d_sb);
1116         p->dentry = dget(dentry);
1117         p->dir = parent;
1118         p->owner = sp;
1119         atomic_inc(&sp->so_count);
1120         p->o_arg.open_flags = flags;
1121         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1122         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1123                         fmode, flags);
1124         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1125          * will return permission denied for all bits until close */
1126         if (!(flags & O_EXCL)) {
1127                 /* ask server to check for all possible rights as results
1128                  * are cached */
1129                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1130                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1131         }
1132         p->o_arg.clientid = server->nfs_client->cl_clientid;
1133         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1134         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1135         p->o_arg.name = &dentry->d_name;
1136         p->o_arg.server = server;
1137         p->o_arg.bitmask = nfs4_bitmask(server, label);
1138         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1139         p->o_arg.label = nfs4_label_copy(p->a_label, label);
1140         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1141         switch (p->o_arg.claim) {
1142         case NFS4_OPEN_CLAIM_NULL:
1143         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1144         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1145                 p->o_arg.fh = NFS_FH(dir);
1146                 break;
1147         case NFS4_OPEN_CLAIM_PREVIOUS:
1148         case NFS4_OPEN_CLAIM_FH:
1149         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1150         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1151                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1152         }
1153         if (attrs != NULL && attrs->ia_valid != 0) {
1154                 __u32 verf[2];
1155
1156                 p->o_arg.u.attrs = &p->attrs;
1157                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1158
1159                 verf[0] = jiffies;
1160                 verf[1] = current->pid;
1161                 memcpy(p->o_arg.u.verifier.data, verf,
1162                                 sizeof(p->o_arg.u.verifier.data));
1163         }
1164         p->c_arg.fh = &p->o_res.fh;
1165         p->c_arg.stateid = &p->o_res.stateid;
1166         p->c_arg.seqid = p->o_arg.seqid;
1167         nfs4_init_opendata_res(p);
1168         kref_init(&p->kref);
1169         return p;
1170
1171 err_free_label:
1172         nfs4_label_free(p->a_label);
1173 err_free_f:
1174         nfs4_label_free(p->f_label);
1175 err_free_p:
1176         kfree(p);
1177 err:
1178         dput(parent);
1179         return NULL;
1180 }
1181
1182 static void nfs4_opendata_free(struct kref *kref)
1183 {
1184         struct nfs4_opendata *p = container_of(kref,
1185                         struct nfs4_opendata, kref);
1186         struct super_block *sb = p->dentry->d_sb;
1187
1188         nfs_free_seqid(p->o_arg.seqid);
1189         if (p->state != NULL)
1190                 nfs4_put_open_state(p->state);
1191         nfs4_put_state_owner(p->owner);
1192
1193         nfs4_label_free(p->a_label);
1194         nfs4_label_free(p->f_label);
1195
1196         dput(p->dir);
1197         dput(p->dentry);
1198         nfs_sb_deactive(sb);
1199         nfs_fattr_free_names(&p->f_attr);
1200         kfree(p->f_attr.mdsthreshold);
1201         kfree(p);
1202 }
1203
1204 static void nfs4_opendata_put(struct nfs4_opendata *p)
1205 {
1206         if (p != NULL)
1207                 kref_put(&p->kref, nfs4_opendata_free);
1208 }
1209
1210 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1211 {
1212         int ret;
1213
1214         ret = rpc_wait_for_completion_task(task);
1215         return ret;
1216 }
1217
1218 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1219                 fmode_t fmode)
1220 {
1221         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1222         case FMODE_READ|FMODE_WRITE:
1223                 return state->n_rdwr != 0;
1224         case FMODE_WRITE:
1225                 return state->n_wronly != 0;
1226         case FMODE_READ:
1227                 return state->n_rdonly != 0;
1228         }
1229         WARN_ON_ONCE(1);
1230         return false;
1231 }
1232
1233 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1234 {
1235         int ret = 0;
1236
1237         if (open_mode & (O_EXCL|O_TRUNC))
1238                 goto out;
1239         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1240                 case FMODE_READ:
1241                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1242                                 && state->n_rdonly != 0;
1243                         break;
1244                 case FMODE_WRITE:
1245                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1246                                 && state->n_wronly != 0;
1247                         break;
1248                 case FMODE_READ|FMODE_WRITE:
1249                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1250                                 && state->n_rdwr != 0;
1251         }
1252 out:
1253         return ret;
1254 }
1255
1256 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1257                 enum open_claim_type4 claim)
1258 {
1259         if (delegation == NULL)
1260                 return 0;
1261         if ((delegation->type & fmode) != fmode)
1262                 return 0;
1263         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1264                 return 0;
1265         switch (claim) {
1266         case NFS4_OPEN_CLAIM_NULL:
1267         case NFS4_OPEN_CLAIM_FH:
1268                 break;
1269         case NFS4_OPEN_CLAIM_PREVIOUS:
1270                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1271                         break;
1272         default:
1273                 return 0;
1274         }
1275         nfs_mark_delegation_referenced(delegation);
1276         return 1;
1277 }
1278
1279 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1280 {
1281         switch (fmode) {
1282                 case FMODE_WRITE:
1283                         state->n_wronly++;
1284                         break;
1285                 case FMODE_READ:
1286                         state->n_rdonly++;
1287                         break;
1288                 case FMODE_READ|FMODE_WRITE:
1289                         state->n_rdwr++;
1290         }
1291         nfs4_state_set_mode_locked(state, state->state | fmode);
1292 }
1293
1294 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1295 {
1296         struct nfs_client *clp = state->owner->so_server->nfs_client;
1297         bool need_recover = false;
1298
1299         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1300                 need_recover = true;
1301         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1302                 need_recover = true;
1303         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1304                 need_recover = true;
1305         if (need_recover)
1306                 nfs4_state_mark_reclaim_nograce(clp, state);
1307 }
1308
1309 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1310                 nfs4_stateid *stateid)
1311 {
1312         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1313                 return true;
1314         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1315                 nfs_test_and_clear_all_open_stateid(state);
1316                 return true;
1317         }
1318         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1319                 return true;
1320         return false;
1321 }
1322
1323 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1324 {
1325         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1326                 return;
1327         if (state->n_wronly)
1328                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1329         if (state->n_rdonly)
1330                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1331         if (state->n_rdwr)
1332                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1333         set_bit(NFS_OPEN_STATE, &state->flags);
1334 }
1335
1336 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1337                 nfs4_stateid *arg_stateid,
1338                 nfs4_stateid *stateid, fmode_t fmode)
1339 {
1340         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1341         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1342         case FMODE_WRITE:
1343                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1344                 break;
1345         case FMODE_READ:
1346                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1347                 break;
1348         case 0:
1349                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1350                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1351                 clear_bit(NFS_OPEN_STATE, &state->flags);
1352         }
1353         if (stateid == NULL)
1354                 return;
1355         /* Handle races with OPEN */
1356         if (!nfs4_stateid_match_other(arg_stateid, &state->open_stateid) ||
1357             (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1358             !nfs4_stateid_is_newer(stateid, &state->open_stateid))) {
1359                 nfs_resync_open_stateid_locked(state);
1360                 return;
1361         }
1362         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1363                 nfs4_stateid_copy(&state->stateid, stateid);
1364         nfs4_stateid_copy(&state->open_stateid, stateid);
1365 }
1366
1367 static void nfs_clear_open_stateid(struct nfs4_state *state,
1368         nfs4_stateid *arg_stateid,
1369         nfs4_stateid *stateid, fmode_t fmode)
1370 {
1371         write_seqlock(&state->seqlock);
1372         nfs_clear_open_stateid_locked(state, arg_stateid, stateid, fmode);
1373         write_sequnlock(&state->seqlock);
1374         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1375                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1376 }
1377
1378 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1379 {
1380         switch (fmode) {
1381                 case FMODE_READ:
1382                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1383                         break;
1384                 case FMODE_WRITE:
1385                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1386                         break;
1387                 case FMODE_READ|FMODE_WRITE:
1388                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1389         }
1390         if (!nfs_need_update_open_stateid(state, stateid))
1391                 return;
1392         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1393                 nfs4_stateid_copy(&state->stateid, stateid);
1394         nfs4_stateid_copy(&state->open_stateid, stateid);
1395 }
1396
1397 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1398 {
1399         /*
1400          * Protect the call to nfs4_state_set_mode_locked and
1401          * serialise the stateid update
1402          */
1403         spin_lock(&state->owner->so_lock);
1404         write_seqlock(&state->seqlock);
1405         if (deleg_stateid != NULL) {
1406                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1407                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1408         }
1409         if (open_stateid != NULL)
1410                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1411         write_sequnlock(&state->seqlock);
1412         update_open_stateflags(state, fmode);
1413         spin_unlock(&state->owner->so_lock);
1414 }
1415
1416 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1417 {
1418         struct nfs_inode *nfsi = NFS_I(state->inode);
1419         struct nfs_delegation *deleg_cur;
1420         int ret = 0;
1421
1422         fmode &= (FMODE_READ|FMODE_WRITE);
1423
1424         rcu_read_lock();
1425         deleg_cur = rcu_dereference(nfsi->delegation);
1426         if (deleg_cur == NULL)
1427                 goto no_delegation;
1428
1429         spin_lock(&deleg_cur->lock);
1430         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1431            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1432             (deleg_cur->type & fmode) != fmode)
1433                 goto no_delegation_unlock;
1434
1435         if (delegation == NULL)
1436                 delegation = &deleg_cur->stateid;
1437         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1438                 goto no_delegation_unlock;
1439
1440         nfs_mark_delegation_referenced(deleg_cur);
1441         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1442         ret = 1;
1443 no_delegation_unlock:
1444         spin_unlock(&deleg_cur->lock);
1445 no_delegation:
1446         rcu_read_unlock();
1447
1448         if (!ret && open_stateid != NULL) {
1449                 __update_open_stateid(state, open_stateid, NULL, fmode);
1450                 ret = 1;
1451         }
1452         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1453                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1454
1455         return ret;
1456 }
1457
1458 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1459                 const nfs4_stateid *stateid)
1460 {
1461         struct nfs4_state *state = lsp->ls_state;
1462         bool ret = false;
1463
1464         spin_lock(&state->state_lock);
1465         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1466                 goto out_noupdate;
1467         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1468                 goto out_noupdate;
1469         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1470         ret = true;
1471 out_noupdate:
1472         spin_unlock(&state->state_lock);
1473         return ret;
1474 }
1475
1476 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1477 {
1478         struct nfs_delegation *delegation;
1479
1480         rcu_read_lock();
1481         delegation = rcu_dereference(NFS_I(inode)->delegation);
1482         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1483                 rcu_read_unlock();
1484                 return;
1485         }
1486         rcu_read_unlock();
1487         nfs4_inode_return_delegation(inode);
1488 }
1489
1490 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1491 {
1492         struct nfs4_state *state = opendata->state;
1493         struct nfs_inode *nfsi = NFS_I(state->inode);
1494         struct nfs_delegation *delegation;
1495         int open_mode = opendata->o_arg.open_flags;
1496         fmode_t fmode = opendata->o_arg.fmode;
1497         enum open_claim_type4 claim = opendata->o_arg.claim;
1498         nfs4_stateid stateid;
1499         int ret = -EAGAIN;
1500
1501         for (;;) {
1502                 spin_lock(&state->owner->so_lock);
1503                 if (can_open_cached(state, fmode, open_mode)) {
1504                         update_open_stateflags(state, fmode);
1505                         spin_unlock(&state->owner->so_lock);
1506                         goto out_return_state;
1507                 }
1508                 spin_unlock(&state->owner->so_lock);
1509                 rcu_read_lock();
1510                 delegation = rcu_dereference(nfsi->delegation);
1511                 if (!can_open_delegated(delegation, fmode, claim)) {
1512                         rcu_read_unlock();
1513                         break;
1514                 }
1515                 /* Save the delegation */
1516                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1517                 rcu_read_unlock();
1518                 nfs_release_seqid(opendata->o_arg.seqid);
1519                 if (!opendata->is_recover) {
1520                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1521                         if (ret != 0)
1522                                 goto out;
1523                 }
1524                 ret = -EAGAIN;
1525
1526                 /* Try to update the stateid using the delegation */
1527                 if (update_open_stateid(state, NULL, &stateid, fmode))
1528                         goto out_return_state;
1529         }
1530 out:
1531         return ERR_PTR(ret);
1532 out_return_state:
1533         atomic_inc(&state->count);
1534         return state;
1535 }
1536
1537 static void
1538 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1539 {
1540         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1541         struct nfs_delegation *delegation;
1542         int delegation_flags = 0;
1543
1544         rcu_read_lock();
1545         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1546         if (delegation)
1547                 delegation_flags = delegation->flags;
1548         rcu_read_unlock();
1549         switch (data->o_arg.claim) {
1550         default:
1551                 break;
1552         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1553         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1554                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1555                                    "returning a delegation for "
1556                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1557                                    clp->cl_hostname);
1558                 return;
1559         }
1560         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1561                 nfs_inode_set_delegation(state->inode,
1562                                          data->owner->so_cred,
1563                                          &data->o_res);
1564         else
1565                 nfs_inode_reclaim_delegation(state->inode,
1566                                              data->owner->so_cred,
1567                                              &data->o_res);
1568 }
1569
1570 /*
1571  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1572  * and update the nfs4_state.
1573  */
1574 static struct nfs4_state *
1575 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1576 {
1577         struct inode *inode = data->state->inode;
1578         struct nfs4_state *state = data->state;
1579         int ret;
1580
1581         if (!data->rpc_done) {
1582                 if (data->rpc_status) {
1583                         ret = data->rpc_status;
1584                         goto err;
1585                 }
1586                 /* cached opens have already been processed */
1587                 goto update;
1588         }
1589
1590         ret = nfs_refresh_inode(inode, &data->f_attr);
1591         if (ret)
1592                 goto err;
1593
1594         if (data->o_res.delegation_type != 0)
1595                 nfs4_opendata_check_deleg(data, state);
1596 update:
1597         update_open_stateid(state, &data->o_res.stateid, NULL,
1598                             data->o_arg.fmode);
1599         atomic_inc(&state->count);
1600
1601         return state;
1602 err:
1603         return ERR_PTR(ret);
1604
1605 }
1606
1607 static struct nfs4_state *
1608 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1609 {
1610         struct inode *inode;
1611         struct nfs4_state *state = NULL;
1612         int ret;
1613
1614         if (!data->rpc_done) {
1615                 state = nfs4_try_open_cached(data);
1616                 trace_nfs4_cached_open(data->state);
1617                 goto out;
1618         }
1619
1620         ret = -EAGAIN;
1621         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1622                 goto err;
1623         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1624         ret = PTR_ERR(inode);
1625         if (IS_ERR(inode))
1626                 goto err;
1627         ret = -ENOMEM;
1628         state = nfs4_get_open_state(inode, data->owner);
1629         if (state == NULL)
1630                 goto err_put_inode;
1631         if (data->o_res.delegation_type != 0)
1632                 nfs4_opendata_check_deleg(data, state);
1633         update_open_stateid(state, &data->o_res.stateid, NULL,
1634                         data->o_arg.fmode);
1635         iput(inode);
1636 out:
1637         nfs_release_seqid(data->o_arg.seqid);
1638         return state;
1639 err_put_inode:
1640         iput(inode);
1641 err:
1642         return ERR_PTR(ret);
1643 }
1644
1645 static struct nfs4_state *
1646 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1647 {
1648         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1649                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1650         return _nfs4_opendata_to_nfs4_state(data);
1651 }
1652
1653 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1654 {
1655         struct nfs_inode *nfsi = NFS_I(state->inode);
1656         struct nfs_open_context *ctx;
1657
1658         spin_lock(&state->inode->i_lock);
1659         list_for_each_entry(ctx, &nfsi->open_files, list) {
1660                 if (ctx->state != state)
1661                         continue;
1662                 get_nfs_open_context(ctx);
1663                 spin_unlock(&state->inode->i_lock);
1664                 return ctx;
1665         }
1666         spin_unlock(&state->inode->i_lock);
1667         return ERR_PTR(-ENOENT);
1668 }
1669
1670 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1671                 struct nfs4_state *state, enum open_claim_type4 claim)
1672 {
1673         struct nfs4_opendata *opendata;
1674
1675         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1676                         NULL, NULL, claim, GFP_NOFS);
1677         if (opendata == NULL)
1678                 return ERR_PTR(-ENOMEM);
1679         opendata->state = state;
1680         atomic_inc(&state->count);
1681         return opendata;
1682 }
1683
1684 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
1685                 fmode_t fmode)
1686 {
1687         struct nfs4_state *newstate;
1688         int ret;
1689
1690         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
1691                 return 0;
1692         opendata->o_arg.open_flags = 0;
1693         opendata->o_arg.fmode = fmode;
1694         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1695                         NFS_SB(opendata->dentry->d_sb),
1696                         fmode, 0);
1697         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1698         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1699         nfs4_init_opendata_res(opendata);
1700         ret = _nfs4_recover_proc_open(opendata);
1701         if (ret != 0)
1702                 return ret;
1703         newstate = nfs4_opendata_to_nfs4_state(opendata);
1704         if (IS_ERR(newstate))
1705                 return PTR_ERR(newstate);
1706         if (newstate != opendata->state)
1707                 ret = -ESTALE;
1708         nfs4_close_state(newstate, fmode);
1709         return ret;
1710 }
1711
1712 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1713 {
1714         int ret;
1715
1716         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1717         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1718         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1719         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1720         /* memory barrier prior to reading state->n_* */
1721         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1722         clear_bit(NFS_OPEN_STATE, &state->flags);
1723         smp_rmb();
1724         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1725         if (ret != 0)
1726                 return ret;
1727         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1728         if (ret != 0)
1729                 return ret;
1730         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
1731         if (ret != 0)
1732                 return ret;
1733         /*
1734          * We may have performed cached opens for all three recoveries.
1735          * Check if we need to update the current stateid.
1736          */
1737         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1738             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1739                 write_seqlock(&state->seqlock);
1740                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1741                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1742                 write_sequnlock(&state->seqlock);
1743         }
1744         return 0;
1745 }
1746
1747 /*
1748  * OPEN_RECLAIM:
1749  *      reclaim state on the server after a reboot.
1750  */
1751 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1752 {
1753         struct nfs_delegation *delegation;
1754         struct nfs4_opendata *opendata;
1755         fmode_t delegation_type = 0;
1756         int status;
1757
1758         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1759                         NFS4_OPEN_CLAIM_PREVIOUS);
1760         if (IS_ERR(opendata))
1761                 return PTR_ERR(opendata);
1762         rcu_read_lock();
1763         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1764         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1765                 delegation_type = delegation->type;
1766         rcu_read_unlock();
1767         opendata->o_arg.u.delegation_type = delegation_type;
1768         status = nfs4_open_recover(opendata, state);
1769         nfs4_opendata_put(opendata);
1770         return status;
1771 }
1772
1773 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1774 {
1775         struct nfs_server *server = NFS_SERVER(state->inode);
1776         struct nfs4_exception exception = { };
1777         int err;
1778         do {
1779                 err = _nfs4_do_open_reclaim(ctx, state);
1780                 trace_nfs4_open_reclaim(ctx, 0, err);
1781                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1782                         continue;
1783                 if (err != -NFS4ERR_DELAY)
1784                         break;
1785                 nfs4_handle_exception(server, err, &exception);
1786         } while (exception.retry);
1787         return err;
1788 }
1789
1790 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1791 {
1792         struct nfs_open_context *ctx;
1793         int ret;
1794
1795         ctx = nfs4_state_find_open_context(state);
1796         if (IS_ERR(ctx))
1797                 return -EAGAIN;
1798         ret = nfs4_do_open_reclaim(ctx, state);
1799         put_nfs_open_context(ctx);
1800         return ret;
1801 }
1802
1803 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1804 {
1805         switch (err) {
1806                 default:
1807                         printk(KERN_ERR "NFS: %s: unhandled error "
1808                                         "%d.\n", __func__, err);
1809                 case 0:
1810                 case -ENOENT:
1811                 case -EAGAIN:
1812                 case -ESTALE:
1813                         break;
1814                 case -NFS4ERR_BADSESSION:
1815                 case -NFS4ERR_BADSLOT:
1816                 case -NFS4ERR_BAD_HIGH_SLOT:
1817                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1818                 case -NFS4ERR_DEADSESSION:
1819                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1820                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1821                         return -EAGAIN;
1822                 case -NFS4ERR_STALE_CLIENTID:
1823                 case -NFS4ERR_STALE_STATEID:
1824                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1825                 case -NFS4ERR_EXPIRED:
1826                         /* Don't recall a delegation if it was lost */
1827                         nfs4_schedule_lease_recovery(server->nfs_client);
1828                         return -EAGAIN;
1829                 case -NFS4ERR_MOVED:
1830                         nfs4_schedule_migration_recovery(server);
1831                         return -EAGAIN;
1832                 case -NFS4ERR_LEASE_MOVED:
1833                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1834                         return -EAGAIN;
1835                 case -NFS4ERR_DELEG_REVOKED:
1836                 case -NFS4ERR_ADMIN_REVOKED:
1837                 case -NFS4ERR_BAD_STATEID:
1838                 case -NFS4ERR_OPENMODE:
1839                         nfs_inode_find_state_and_recover(state->inode,
1840                                         stateid);
1841                         nfs4_schedule_stateid_recovery(server, state);
1842                         return -EAGAIN;
1843                 case -NFS4ERR_DELAY:
1844                 case -NFS4ERR_GRACE:
1845                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1846                         ssleep(1);
1847                         return -EAGAIN;
1848                 case -ENOMEM:
1849                 case -NFS4ERR_DENIED:
1850                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1851                         return 0;
1852         }
1853         return err;
1854 }
1855
1856 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
1857                 struct nfs4_state *state, const nfs4_stateid *stateid,
1858                 fmode_t type)
1859 {
1860         struct nfs_server *server = NFS_SERVER(state->inode);
1861         struct nfs4_opendata *opendata;
1862         int err = 0;
1863
1864         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1865                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1866         if (IS_ERR(opendata))
1867                 return PTR_ERR(opendata);
1868         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1869         write_seqlock(&state->seqlock);
1870         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1871         write_sequnlock(&state->seqlock);
1872         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1873         switch (type & (FMODE_READ|FMODE_WRITE)) {
1874         case FMODE_READ|FMODE_WRITE:
1875         case FMODE_WRITE:
1876                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1877                 if (err)
1878                         break;
1879                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1880                 if (err)
1881                         break;
1882         case FMODE_READ:
1883                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
1884         }
1885         nfs4_opendata_put(opendata);
1886         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1887 }
1888
1889 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1890 {
1891         struct nfs4_opendata *data = calldata;
1892
1893         nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
1894                              &data->c_arg.seq_args, &data->c_res.seq_res, task);
1895 }
1896
1897 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1898 {
1899         struct nfs4_opendata *data = calldata;
1900
1901         nfs40_sequence_done(task, &data->c_res.seq_res);
1902
1903         data->rpc_status = task->tk_status;
1904         if (data->rpc_status == 0) {
1905                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1906                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1907                 renew_lease(data->o_res.server, data->timestamp);
1908                 data->rpc_done = 1;
1909         }
1910 }
1911
1912 static void nfs4_open_confirm_release(void *calldata)
1913 {
1914         struct nfs4_opendata *data = calldata;
1915         struct nfs4_state *state = NULL;
1916
1917         /* If this request hasn't been cancelled, do nothing */
1918         if (data->cancelled == 0)
1919                 goto out_free;
1920         /* In case of error, no cleanup! */
1921         if (!data->rpc_done)
1922                 goto out_free;
1923         state = nfs4_opendata_to_nfs4_state(data);
1924         if (!IS_ERR(state))
1925                 nfs4_close_state(state, data->o_arg.fmode);
1926 out_free:
1927         nfs4_opendata_put(data);
1928 }
1929
1930 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1931         .rpc_call_prepare = nfs4_open_confirm_prepare,
1932         .rpc_call_done = nfs4_open_confirm_done,
1933         .rpc_release = nfs4_open_confirm_release,
1934 };
1935
1936 /*
1937  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1938  */
1939 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1940 {
1941         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
1942         struct rpc_task *task;
1943         struct  rpc_message msg = {
1944                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1945                 .rpc_argp = &data->c_arg,
1946                 .rpc_resp = &data->c_res,
1947                 .rpc_cred = data->owner->so_cred,
1948         };
1949         struct rpc_task_setup task_setup_data = {
1950                 .rpc_client = server->client,
1951                 .rpc_message = &msg,
1952                 .callback_ops = &nfs4_open_confirm_ops,
1953                 .callback_data = data,
1954                 .workqueue = nfsiod_workqueue,
1955                 .flags = RPC_TASK_ASYNC,
1956         };
1957         int status;
1958
1959         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1960         kref_get(&data->kref);
1961         data->rpc_done = 0;
1962         data->rpc_status = 0;
1963         data->timestamp = jiffies;
1964         if (data->is_recover)
1965                 nfs4_set_sequence_privileged(&data->c_arg.seq_args);
1966         task = rpc_run_task(&task_setup_data);
1967         if (IS_ERR(task))
1968                 return PTR_ERR(task);
1969         status = nfs4_wait_for_completion_rpc_task(task);
1970         if (status != 0) {
1971                 data->cancelled = 1;
1972                 smp_wmb();
1973         } else
1974                 status = data->rpc_status;
1975         rpc_put_task(task);
1976         return status;
1977 }
1978
1979 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1980 {
1981         struct nfs4_opendata *data = calldata;
1982         struct nfs4_state_owner *sp = data->owner;
1983         struct nfs_client *clp = sp->so_server->nfs_client;
1984         enum open_claim_type4 claim = data->o_arg.claim;
1985
1986         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1987                 goto out_wait;
1988         /*
1989          * Check if we still need to send an OPEN call, or if we can use
1990          * a delegation instead.
1991          */
1992         if (data->state != NULL) {
1993                 struct nfs_delegation *delegation;
1994
1995                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1996                         goto out_no_action;
1997                 rcu_read_lock();
1998                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1999                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2000                         goto unlock_no_action;
2001                 rcu_read_unlock();
2002         }
2003         /* Update client id. */
2004         data->o_arg.clientid = clp->cl_clientid;
2005         switch (claim) {
2006         default:
2007                 break;
2008         case NFS4_OPEN_CLAIM_PREVIOUS:
2009         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2010         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2011                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2012         case NFS4_OPEN_CLAIM_FH:
2013                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2014                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
2015         }
2016         data->timestamp = jiffies;
2017         if (nfs4_setup_sequence(data->o_arg.server,
2018                                 &data->o_arg.seq_args,
2019                                 &data->o_res.seq_res,
2020                                 task) != 0)
2021                 nfs_release_seqid(data->o_arg.seqid);
2022
2023         /* Set the create mode (note dependency on the session type) */
2024         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2025         if (data->o_arg.open_flags & O_EXCL) {
2026                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2027                 if (nfs4_has_persistent_session(clp))
2028                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2029                 else if (clp->cl_mvops->minor_version > 0)
2030                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2031         }
2032         return;
2033 unlock_no_action:
2034         trace_nfs4_cached_open(data->state);
2035         rcu_read_unlock();
2036 out_no_action:
2037         task->tk_action = NULL;
2038 out_wait:
2039         nfs4_sequence_done(task, &data->o_res.seq_res);
2040 }
2041
2042 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2043 {
2044         struct nfs4_opendata *data = calldata;
2045
2046         data->rpc_status = task->tk_status;
2047
2048         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
2049                 return;
2050
2051         if (task->tk_status == 0) {
2052                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2053                         switch (data->o_res.f_attr->mode & S_IFMT) {
2054                         case S_IFREG:
2055                                 break;
2056                         case S_IFLNK:
2057                                 data->rpc_status = -ELOOP;
2058                                 break;
2059                         case S_IFDIR:
2060                                 data->rpc_status = -EISDIR;
2061                                 break;
2062                         default:
2063                                 data->rpc_status = -ENOTDIR;
2064                         }
2065                 }
2066                 renew_lease(data->o_res.server, data->timestamp);
2067                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2068                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2069         }
2070         data->rpc_done = 1;
2071 }
2072
2073 static void nfs4_open_release(void *calldata)
2074 {
2075         struct nfs4_opendata *data = calldata;
2076         struct nfs4_state *state = NULL;
2077
2078         /* If this request hasn't been cancelled, do nothing */
2079         if (data->cancelled == 0)
2080                 goto out_free;
2081         /* In case of error, no cleanup! */
2082         if (data->rpc_status != 0 || !data->rpc_done)
2083                 goto out_free;
2084         /* In case we need an open_confirm, no cleanup! */
2085         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2086                 goto out_free;
2087         state = nfs4_opendata_to_nfs4_state(data);
2088         if (!IS_ERR(state))
2089                 nfs4_close_state(state, data->o_arg.fmode);
2090 out_free:
2091         nfs4_opendata_put(data);
2092 }
2093
2094 static const struct rpc_call_ops nfs4_open_ops = {
2095         .rpc_call_prepare = nfs4_open_prepare,
2096         .rpc_call_done = nfs4_open_done,
2097         .rpc_release = nfs4_open_release,
2098 };
2099
2100 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
2101 {
2102         struct inode *dir = d_inode(data->dir);
2103         struct nfs_server *server = NFS_SERVER(dir);
2104         struct nfs_openargs *o_arg = &data->o_arg;
2105         struct nfs_openres *o_res = &data->o_res;
2106         struct rpc_task *task;
2107         struct rpc_message msg = {
2108                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2109                 .rpc_argp = o_arg,
2110                 .rpc_resp = o_res,
2111                 .rpc_cred = data->owner->so_cred,
2112         };
2113         struct rpc_task_setup task_setup_data = {
2114                 .rpc_client = server->client,
2115                 .rpc_message = &msg,
2116                 .callback_ops = &nfs4_open_ops,
2117                 .callback_data = data,
2118                 .workqueue = nfsiod_workqueue,
2119                 .flags = RPC_TASK_ASYNC,
2120         };
2121         int status;
2122
2123         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
2124         kref_get(&data->kref);
2125         data->rpc_done = 0;
2126         data->rpc_status = 0;
2127         data->cancelled = 0;
2128         data->is_recover = 0;
2129         if (isrecover) {
2130                 nfs4_set_sequence_privileged(&o_arg->seq_args);
2131                 data->is_recover = 1;
2132         }
2133         task = rpc_run_task(&task_setup_data);
2134         if (IS_ERR(task))
2135                 return PTR_ERR(task);
2136         status = nfs4_wait_for_completion_rpc_task(task);
2137         if (status != 0) {
2138                 data->cancelled = 1;
2139                 smp_wmb();
2140         } else
2141                 status = data->rpc_status;
2142         rpc_put_task(task);
2143
2144         return status;
2145 }
2146
2147 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2148 {
2149         struct inode *dir = d_inode(data->dir);
2150         struct nfs_openres *o_res = &data->o_res;
2151         int status;
2152
2153         status = nfs4_run_open_task(data, 1);
2154         if (status != 0 || !data->rpc_done)
2155                 return status;
2156
2157         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2158
2159         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2160                 status = _nfs4_proc_open_confirm(data);
2161                 if (status != 0)
2162                         return status;
2163         }
2164
2165         return status;
2166 }
2167
2168 /*
2169  * Additional permission checks in order to distinguish between an
2170  * open for read, and an open for execute. This works around the
2171  * fact that NFSv4 OPEN treats read and execute permissions as being
2172  * the same.
2173  * Note that in the non-execute case, we want to turn off permission
2174  * checking if we just created a new file (POSIX open() semantics).
2175  */
2176 static int nfs4_opendata_access(struct rpc_cred *cred,
2177                                 struct nfs4_opendata *opendata,
2178                                 struct nfs4_state *state, fmode_t fmode,
2179                                 int openflags)
2180 {
2181         struct nfs_access_entry cache;
2182         u32 mask;
2183
2184         /* access call failed or for some reason the server doesn't
2185          * support any access modes -- defer access call until later */
2186         if (opendata->o_res.access_supported == 0)
2187                 return 0;
2188
2189         mask = 0;
2190         /*
2191          * Use openflags to check for exec, because fmode won't
2192          * always have FMODE_EXEC set when file open for exec.
2193          */
2194         if (openflags & __FMODE_EXEC) {
2195                 /* ONLY check for exec rights */
2196                 mask = MAY_EXEC;
2197         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2198                 mask = MAY_READ;
2199
2200         cache.cred = cred;
2201         cache.jiffies = jiffies;
2202         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2203         nfs_access_add_cache(state->inode, &cache);
2204
2205         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2206                 return 0;
2207
2208         /* even though OPEN succeeded, access is denied. Close the file */
2209         nfs4_close_state(state, fmode);
2210         return -EACCES;
2211 }
2212
2213 /*
2214  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2215  */
2216 static int _nfs4_proc_open(struct nfs4_opendata *data)
2217 {
2218         struct inode *dir = d_inode(data->dir);
2219         struct nfs_server *server = NFS_SERVER(dir);
2220         struct nfs_openargs *o_arg = &data->o_arg;
2221         struct nfs_openres *o_res = &data->o_res;
2222         int status;
2223
2224         status = nfs4_run_open_task(data, 0);
2225         if (!data->rpc_done)
2226                 return status;
2227         if (status != 0) {
2228                 if (status == -NFS4ERR_BADNAME &&
2229                                 !(o_arg->open_flags & O_CREAT))
2230                         return -ENOENT;
2231                 return status;
2232         }
2233
2234         nfs_fattr_map_and_free_names(server, &data->f_attr);
2235
2236         if (o_arg->open_flags & O_CREAT) {
2237                 update_changeattr(dir, &o_res->cinfo);
2238                 if (o_arg->open_flags & O_EXCL)
2239                         data->file_created = 1;
2240                 else if (o_res->cinfo.before != o_res->cinfo.after)
2241                         data->file_created = 1;
2242         }
2243         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2244                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2245         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2246                 status = _nfs4_proc_open_confirm(data);
2247                 if (status != 0)
2248                         return status;
2249         }
2250         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2251                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2252         return 0;
2253 }
2254
2255 static int nfs4_recover_expired_lease(struct nfs_server *server)
2256 {
2257         return nfs4_client_recover_expired_lease(server->nfs_client);
2258 }
2259
2260 /*
2261  * OPEN_EXPIRED:
2262  *      reclaim state on the server after a network partition.
2263  *      Assumes caller holds the appropriate lock
2264  */
2265 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2266 {
2267         struct nfs4_opendata *opendata;
2268         int ret;
2269
2270         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2271                         NFS4_OPEN_CLAIM_FH);
2272         if (IS_ERR(opendata))
2273                 return PTR_ERR(opendata);
2274         ret = nfs4_open_recover(opendata, state);
2275         if (ret == -ESTALE)
2276                 d_drop(ctx->dentry);
2277         nfs4_opendata_put(opendata);
2278         return ret;
2279 }
2280
2281 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2282 {
2283         struct nfs_server *server = NFS_SERVER(state->inode);
2284         struct nfs4_exception exception = { };
2285         int err;
2286
2287         do {
2288                 err = _nfs4_open_expired(ctx, state);
2289                 trace_nfs4_open_expired(ctx, 0, err);
2290                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2291                         continue;
2292                 switch (err) {
2293                 default:
2294                         goto out;
2295                 case -NFS4ERR_GRACE:
2296                 case -NFS4ERR_DELAY:
2297                         nfs4_handle_exception(server, err, &exception);
2298                         err = 0;
2299                 }
2300         } while (exception.retry);
2301 out:
2302         return err;
2303 }
2304
2305 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2306 {
2307         struct nfs_open_context *ctx;
2308         int ret;
2309
2310         ctx = nfs4_state_find_open_context(state);
2311         if (IS_ERR(ctx))
2312                 return -EAGAIN;
2313         ret = nfs4_do_open_expired(ctx, state);
2314         put_nfs_open_context(ctx);
2315         return ret;
2316 }
2317
2318 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2319 {
2320         nfs_remove_bad_delegation(state->inode);
2321         write_seqlock(&state->seqlock);
2322         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2323         write_sequnlock(&state->seqlock);
2324         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2325 }
2326
2327 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2328 {
2329         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2330                 nfs_finish_clear_delegation_stateid(state);
2331 }
2332
2333 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2334 {
2335         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2336         nfs40_clear_delegation_stateid(state);
2337         return nfs4_open_expired(sp, state);
2338 }
2339
2340 #if defined(CONFIG_NFS_V4_1)
2341 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2342 {
2343         struct nfs_server *server = NFS_SERVER(state->inode);
2344         nfs4_stateid stateid;
2345         struct nfs_delegation *delegation;
2346         struct rpc_cred *cred;
2347         int status;
2348
2349         /* Get the delegation credential for use by test/free_stateid */
2350         rcu_read_lock();
2351         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2352         if (delegation == NULL) {
2353                 rcu_read_unlock();
2354                 return;
2355         }
2356
2357         nfs4_stateid_copy(&stateid, &delegation->stateid);
2358         cred = get_rpccred(delegation->cred);
2359         rcu_read_unlock();
2360         status = nfs41_test_stateid(server, &stateid, cred);
2361         trace_nfs4_test_delegation_stateid(state, NULL, status);
2362
2363         if (status != NFS_OK) {
2364                 /* Free the stateid unless the server explicitly
2365                  * informs us the stateid is unrecognized. */
2366                 if (status != -NFS4ERR_BAD_STATEID)
2367                         nfs41_free_stateid(server, &stateid, cred);
2368                 nfs_finish_clear_delegation_stateid(state);
2369         }
2370
2371         put_rpccred(cred);
2372 }
2373
2374 /**
2375  * nfs41_check_open_stateid - possibly free an open stateid
2376  *
2377  * @state: NFSv4 state for an inode
2378  *
2379  * Returns NFS_OK if recovery for this stateid is now finished.
2380  * Otherwise a negative NFS4ERR value is returned.
2381  */
2382 static int nfs41_check_open_stateid(struct nfs4_state *state)
2383 {
2384         struct nfs_server *server = NFS_SERVER(state->inode);
2385         nfs4_stateid *stateid = &state->open_stateid;
2386         struct rpc_cred *cred = state->owner->so_cred;
2387         int status;
2388
2389         /* If a state reset has been done, test_stateid is unneeded */
2390         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2391             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2392             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2393                 return -NFS4ERR_BAD_STATEID;
2394
2395         status = nfs41_test_stateid(server, stateid, cred);
2396         trace_nfs4_test_open_stateid(state, NULL, status);
2397         if (status != NFS_OK) {
2398                 /* Free the stateid unless the server explicitly
2399                  * informs us the stateid is unrecognized. */
2400                 if (status != -NFS4ERR_BAD_STATEID)
2401                         nfs41_free_stateid(server, stateid, cred);
2402
2403                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2404                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2405                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2406                 clear_bit(NFS_OPEN_STATE, &state->flags);
2407         }
2408         return status;
2409 }
2410
2411 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2412 {
2413         int status;
2414
2415         nfs41_check_delegation_stateid(state);
2416         status = nfs41_check_open_stateid(state);
2417         if (status != NFS_OK)
2418                 status = nfs4_open_expired(sp, state);
2419         return status;
2420 }
2421 #endif
2422
2423 /*
2424  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2425  * fields corresponding to attributes that were used to store the verifier.
2426  * Make sure we clobber those fields in the later setattr call
2427  */
2428 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2429                                 struct iattr *sattr, struct nfs4_label **label)
2430 {
2431         const u32 *attrset = opendata->o_res.attrset;
2432
2433         if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2434             !(sattr->ia_valid & ATTR_ATIME_SET))
2435                 sattr->ia_valid |= ATTR_ATIME;
2436
2437         if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2438             !(sattr->ia_valid & ATTR_MTIME_SET))
2439                 sattr->ia_valid |= ATTR_MTIME;
2440
2441         /* Except MODE, it seems harmless of setting twice. */
2442         if ((attrset[1] & FATTR4_WORD1_MODE))
2443                 sattr->ia_valid &= ~ATTR_MODE;
2444
2445         if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL)
2446                 *label = NULL;
2447 }
2448
2449 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2450                 fmode_t fmode,
2451                 int flags,
2452                 struct nfs_open_context *ctx)
2453 {
2454         struct nfs4_state_owner *sp = opendata->owner;
2455         struct nfs_server *server = sp->so_server;
2456         struct dentry *dentry;
2457         struct nfs4_state *state;
2458         unsigned int seq;
2459         int ret;
2460
2461         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2462
2463         ret = _nfs4_proc_open(opendata);
2464         if (ret != 0)
2465                 goto out;
2466
2467         state = nfs4_opendata_to_nfs4_state(opendata);
2468         ret = PTR_ERR(state);
2469         if (IS_ERR(state))
2470                 goto out;
2471         if (server->caps & NFS_CAP_POSIX_LOCK)
2472                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2473
2474         dentry = opendata->dentry;
2475         if (d_really_is_negative(dentry)) {
2476                 struct dentry *alias;
2477                 d_drop(dentry);
2478                 alias = d_exact_alias(dentry, state->inode);
2479                 if (!alias)
2480                         alias = d_splice_alias(igrab(state->inode), dentry);
2481                 /* d_splice_alias() can't fail here - it's a non-directory */
2482                 if (alias) {
2483                         dput(ctx->dentry);
2484                         ctx->dentry = dentry = alias;
2485                 }
2486                 nfs_set_verifier(dentry,
2487                                 nfs_save_change_attribute(d_inode(opendata->dir)));
2488         }
2489
2490         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2491         if (ret != 0)
2492                 goto out;
2493
2494         ctx->state = state;
2495         if (d_inode(dentry) == state->inode) {
2496                 nfs_inode_attach_open_context(ctx);
2497                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2498                         nfs4_schedule_stateid_recovery(server, state);
2499         }
2500 out:
2501         return ret;
2502 }
2503
2504 /*
2505  * Returns a referenced nfs4_state
2506  */
2507 static int _nfs4_do_open(struct inode *dir,
2508                         struct nfs_open_context *ctx,
2509                         int flags,
2510                         struct iattr *sattr,
2511                         struct nfs4_label *label,
2512                         int *opened)
2513 {
2514         struct nfs4_state_owner  *sp;
2515         struct nfs4_state     *state = NULL;
2516         struct nfs_server       *server = NFS_SERVER(dir);
2517         struct nfs4_opendata *opendata;
2518         struct dentry *dentry = ctx->dentry;
2519         struct rpc_cred *cred = ctx->cred;
2520         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2521         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2522         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2523         struct nfs4_label *olabel = NULL;
2524         int status;
2525
2526         /* Protect against reboot recovery conflicts */
2527         status = -ENOMEM;
2528         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2529         if (sp == NULL) {
2530                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2531                 goto out_err;
2532         }
2533         status = nfs4_recover_expired_lease(server);
2534         if (status != 0)
2535                 goto err_put_state_owner;
2536         if (d_really_is_positive(dentry))
2537                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2538         status = -ENOMEM;
2539         if (d_really_is_positive(dentry))
2540                 claim = NFS4_OPEN_CLAIM_FH;
2541         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2542                         label, claim, GFP_KERNEL);
2543         if (opendata == NULL)
2544                 goto err_put_state_owner;
2545
2546         if (label) {
2547                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2548                 if (IS_ERR(olabel)) {
2549                         status = PTR_ERR(olabel);
2550                         goto err_opendata_put;
2551                 }
2552         }
2553
2554         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2555                 if (!opendata->f_attr.mdsthreshold) {
2556                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2557                         if (!opendata->f_attr.mdsthreshold)
2558                                 goto err_free_label;
2559                 }
2560                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2561         }
2562         if (d_really_is_positive(dentry))
2563                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2564
2565         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2566         if (status != 0)
2567                 goto err_free_label;
2568         state = ctx->state;
2569
2570         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
2571             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2572                 nfs4_exclusive_attrset(opendata, sattr, &label);
2573                 /*
2574                  * send create attributes which was not set by open
2575                  * with an extra setattr.
2576                  */
2577                 if (sattr->ia_valid & NFS4_VALID_ATTRS) {
2578                         nfs_fattr_init(opendata->o_res.f_attr);
2579                         status = nfs4_do_setattr(state->inode, cred,
2580                                         opendata->o_res.f_attr, sattr,
2581                                         state, label, olabel);
2582                         if (status == 0) {
2583                                 nfs_setattr_update_inode(state->inode, sattr,
2584                                                 opendata->o_res.f_attr);
2585                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2586                         }
2587                 }
2588         }
2589         if (opened && opendata->file_created)
2590                 *opened |= FILE_CREATED;
2591
2592         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2593                 *ctx_th = opendata->f_attr.mdsthreshold;
2594                 opendata->f_attr.mdsthreshold = NULL;
2595         }
2596
2597         nfs4_label_free(olabel);
2598
2599         nfs4_opendata_put(opendata);
2600         nfs4_put_state_owner(sp);
2601         return 0;
2602 err_free_label:
2603         nfs4_label_free(olabel);
2604 err_opendata_put:
2605         nfs4_opendata_put(opendata);
2606 err_put_state_owner:
2607         nfs4_put_state_owner(sp);
2608 out_err:
2609         return status;
2610 }
2611
2612
2613 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2614                                         struct nfs_open_context *ctx,
2615                                         int flags,
2616                                         struct iattr *sattr,
2617                                         struct nfs4_label *label,
2618                                         int *opened)
2619 {
2620         struct nfs_server *server = NFS_SERVER(dir);
2621         struct nfs4_exception exception = { };
2622         struct nfs4_state *res;
2623         int status;
2624
2625         do {
2626                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2627                 res = ctx->state;
2628                 trace_nfs4_open_file(ctx, flags, status);
2629                 if (status == 0)
2630                         break;
2631                 /* NOTE: BAD_SEQID means the server and client disagree about the
2632                  * book-keeping w.r.t. state-changing operations
2633                  * (OPEN/CLOSE/LOCK/LOCKU...)
2634                  * It is actually a sign of a bug on the client or on the server.
2635                  *
2636                  * If we receive a BAD_SEQID error in the particular case of
2637                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2638                  * have unhashed the old state_owner for us, and that we can
2639                  * therefore safely retry using a new one. We should still warn
2640                  * the user though...
2641                  */
2642                 if (status == -NFS4ERR_BAD_SEQID) {
2643                         pr_warn_ratelimited("NFS: v4 server %s "
2644                                         " returned a bad sequence-id error!\n",
2645                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2646                         exception.retry = 1;
2647                         continue;
2648                 }
2649                 /*
2650                  * BAD_STATEID on OPEN means that the server cancelled our
2651                  * state before it received the OPEN_CONFIRM.
2652                  * Recover by retrying the request as per the discussion
2653                  * on Page 181 of RFC3530.
2654                  */
2655                 if (status == -NFS4ERR_BAD_STATEID) {
2656                         exception.retry = 1;
2657                         continue;
2658                 }
2659                 if (status == -EAGAIN) {
2660                         /* We must have found a delegation */
2661                         exception.retry = 1;
2662                         continue;
2663                 }
2664                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2665                         continue;
2666                 res = ERR_PTR(nfs4_handle_exception(server,
2667                                         status, &exception));
2668         } while (exception.retry);
2669         return res;
2670 }
2671
2672 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2673                             struct nfs_fattr *fattr, struct iattr *sattr,
2674                             struct nfs4_state *state, struct nfs4_label *ilabel,
2675                             struct nfs4_label *olabel)
2676 {
2677         struct nfs_server *server = NFS_SERVER(inode);
2678         struct nfs_setattrargs  arg = {
2679                 .fh             = NFS_FH(inode),
2680                 .iap            = sattr,
2681                 .server         = server,
2682                 .bitmask = server->attr_bitmask,
2683                 .label          = ilabel,
2684         };
2685         struct nfs_setattrres  res = {
2686                 .fattr          = fattr,
2687                 .label          = olabel,
2688                 .server         = server,
2689         };
2690         struct rpc_message msg = {
2691                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2692                 .rpc_argp       = &arg,
2693                 .rpc_resp       = &res,
2694                 .rpc_cred       = cred,
2695         };
2696         struct rpc_cred *delegation_cred = NULL;
2697         unsigned long timestamp = jiffies;
2698         fmode_t fmode;
2699         bool truncate;
2700         int status;
2701
2702         arg.bitmask = nfs4_bitmask(server, ilabel);
2703         if (ilabel)
2704                 arg.bitmask = nfs4_bitmask(server, olabel);
2705
2706         nfs_fattr_init(fattr);
2707
2708         /* Servers should only apply open mode checks for file size changes */
2709         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2710         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2711
2712         if (nfs4_copy_delegation_stateid(inode, fmode, &arg.stateid, &delegation_cred)) {
2713                 /* Use that stateid */
2714         } else if (truncate && state != NULL) {
2715                 struct nfs_lockowner lockowner = {
2716                         .l_owner = current->files,
2717                         .l_pid = current->tgid,
2718                 };
2719                 if (!nfs4_valid_open_stateid(state))
2720                         return -EBADF;
2721                 if (nfs4_select_rw_stateid(state, FMODE_WRITE, &lockowner,
2722                                 &arg.stateid, &delegation_cred) == -EIO)
2723                         return -EBADF;
2724         } else
2725                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2726         if (delegation_cred)
2727                 msg.rpc_cred = delegation_cred;
2728
2729         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2730
2731         put_rpccred(delegation_cred);
2732         if (status == 0 && state != NULL)
2733                 renew_lease(server, timestamp);
2734         trace_nfs4_setattr(inode, &arg.stateid, status);
2735         return status;
2736 }
2737
2738 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2739                            struct nfs_fattr *fattr, struct iattr *sattr,
2740                            struct nfs4_state *state, struct nfs4_label *ilabel,
2741                            struct nfs4_label *olabel)
2742 {
2743         struct nfs_server *server = NFS_SERVER(inode);
2744         struct nfs4_exception exception = {
2745                 .state = state,
2746                 .inode = inode,
2747         };
2748         int err;
2749         do {
2750                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2751                 switch (err) {
2752                 case -NFS4ERR_OPENMODE:
2753                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2754                                 pr_warn_once("NFSv4: server %s is incorrectly "
2755                                                 "applying open mode checks to "
2756                                                 "a SETATTR that is not "
2757                                                 "changing file size.\n",
2758                                                 server->nfs_client->cl_hostname);
2759                         }
2760                         if (state && !(state->state & FMODE_WRITE)) {
2761                                 err = -EBADF;
2762                                 if (sattr->ia_valid & ATTR_OPEN)
2763                                         err = -EACCES;
2764                                 goto out;
2765                         }
2766                 }
2767                 err = nfs4_handle_exception(server, err, &exception);
2768         } while (exception.retry);
2769 out:
2770         return err;
2771 }
2772
2773 static bool
2774 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
2775 {
2776         if (inode == NULL || !nfs_have_layout(inode))
2777                 return false;
2778
2779         return pnfs_wait_on_layoutreturn(inode, task);
2780 }
2781
2782 struct nfs4_closedata {
2783         struct inode *inode;
2784         struct nfs4_state *state;
2785         struct nfs_closeargs arg;
2786         struct nfs_closeres res;
2787         struct nfs_fattr fattr;
2788         unsigned long timestamp;
2789         bool roc;
2790         u32 roc_barrier;
2791 };
2792
2793 static void nfs4_free_closedata(void *data)
2794 {
2795         struct nfs4_closedata *calldata = data;
2796         struct nfs4_state_owner *sp = calldata->state->owner;
2797         struct super_block *sb = calldata->state->inode->i_sb;
2798
2799         if (calldata->roc)
2800                 pnfs_roc_release(calldata->state->inode);
2801         nfs4_put_open_state(calldata->state);
2802         nfs_free_seqid(calldata->arg.seqid);
2803         nfs4_put_state_owner(sp);
2804         nfs_sb_deactive(sb);
2805         kfree(calldata);
2806 }
2807
2808 static void nfs4_close_done(struct rpc_task *task, void *data)
2809 {
2810         struct nfs4_closedata *calldata = data;
2811         struct nfs4_state *state = calldata->state;
2812         struct nfs_server *server = NFS_SERVER(calldata->inode);
2813         nfs4_stateid *res_stateid = NULL;
2814
2815         dprintk("%s: begin!\n", __func__);
2816         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2817                 return;
2818         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2819         /* hmm. we are done with the inode, and in the process of freeing
2820          * the state_owner. we keep this around to process errors
2821          */
2822         switch (task->tk_status) {
2823                 case 0:
2824                         res_stateid = &calldata->res.stateid;
2825                         if (calldata->roc)
2826                                 pnfs_roc_set_barrier(state->inode,
2827                                                      calldata->roc_barrier);
2828                         renew_lease(server, calldata->timestamp);
2829                         break;
2830                 case -NFS4ERR_ADMIN_REVOKED:
2831                 case -NFS4ERR_STALE_STATEID:
2832                 case -NFS4ERR_OLD_STATEID:
2833                 case -NFS4ERR_BAD_STATEID:
2834                 case -NFS4ERR_EXPIRED:
2835                         if (!nfs4_stateid_match(&calldata->arg.stateid,
2836                                                 &state->open_stateid)) {
2837                                 rpc_restart_call_prepare(task);
2838                                 goto out_release;
2839                         }
2840                         if (calldata->arg.fmode == 0)
2841                                 break;
2842                 default:
2843                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2844                                 rpc_restart_call_prepare(task);
2845                                 goto out_release;
2846                         }
2847         }
2848         nfs_clear_open_stateid(state, &calldata->arg.stateid,
2849                         res_stateid, calldata->arg.fmode);
2850 out_release:
2851         nfs_release_seqid(calldata->arg.seqid);
2852         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2853         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2854 }
2855
2856 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2857 {
2858         struct nfs4_closedata *calldata = data;
2859         struct nfs4_state *state = calldata->state;
2860         struct inode *inode = calldata->inode;
2861         bool is_rdonly, is_wronly, is_rdwr;
2862         int call_close = 0;
2863
2864         dprintk("%s: begin!\n", __func__);
2865         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2866                 goto out_wait;
2867
2868         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2869         spin_lock(&state->owner->so_lock);
2870         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2871         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2872         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2873         nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
2874         /* Calculate the change in open mode */
2875         calldata->arg.fmode = 0;
2876         if (state->n_rdwr == 0) {
2877                 if (state->n_rdonly == 0)
2878                         call_close |= is_rdonly;
2879                 else if (is_rdonly)
2880                         calldata->arg.fmode |= FMODE_READ;
2881                 if (state->n_wronly == 0)
2882                         call_close |= is_wronly;
2883                 else if (is_wronly)
2884                         calldata->arg.fmode |= FMODE_WRITE;
2885                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
2886                         call_close |= is_rdwr;
2887         } else if (is_rdwr)
2888                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2889
2890         if (!nfs4_valid_open_stateid(state))
2891                 call_close = 0;
2892         spin_unlock(&state->owner->so_lock);
2893
2894         if (!call_close) {
2895                 /* Note: exit _without_ calling nfs4_close_done */
2896                 goto out_no_action;
2897         }
2898
2899         if (nfs4_wait_on_layoutreturn(inode, task)) {
2900                 nfs_release_seqid(calldata->arg.seqid);
2901                 goto out_wait;
2902         }
2903
2904         if (calldata->arg.fmode == 0)
2905                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2906         if (calldata->roc)
2907                 pnfs_roc_get_barrier(inode, &calldata->roc_barrier);
2908
2909         calldata->arg.share_access =
2910                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
2911                                 calldata->arg.fmode, 0);
2912
2913         nfs_fattr_init(calldata->res.fattr);
2914         calldata->timestamp = jiffies;
2915         if (nfs4_setup_sequence(NFS_SERVER(inode),
2916                                 &calldata->arg.seq_args,
2917                                 &calldata->res.seq_res,
2918                                 task) != 0)
2919                 nfs_release_seqid(calldata->arg.seqid);
2920         dprintk("%s: done!\n", __func__);
2921         return;
2922 out_no_action:
2923         task->tk_action = NULL;
2924 out_wait:
2925         nfs4_sequence_done(task, &calldata->res.seq_res);
2926 }
2927
2928 static const struct rpc_call_ops nfs4_close_ops = {
2929         .rpc_call_prepare = nfs4_close_prepare,
2930         .rpc_call_done = nfs4_close_done,
2931         .rpc_release = nfs4_free_closedata,
2932 };
2933
2934 static bool nfs4_roc(struct inode *inode)
2935 {
2936         if (!nfs_have_layout(inode))
2937                 return false;
2938         return pnfs_roc(inode);
2939 }
2940
2941 /*
2942  * It is possible for data to be read/written from a mem-mapped file
2943  * after the sys_close call (which hits the vfs layer as a flush).
2944  * This means that we can't safely call nfsv4 close on a file until
2945  * the inode is cleared. This in turn means that we are not good
2946  * NFSv4 citizens - we do not indicate to the server to update the file's
2947  * share state even when we are done with one of the three share
2948  * stateid's in the inode.
2949  *
2950  * NOTE: Caller must be holding the sp->so_owner semaphore!
2951  */
2952 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2953 {
2954         struct nfs_server *server = NFS_SERVER(state->inode);
2955         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
2956         struct nfs4_closedata *calldata;
2957         struct nfs4_state_owner *sp = state->owner;
2958         struct rpc_task *task;
2959         struct rpc_message msg = {
2960                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2961                 .rpc_cred = state->owner->so_cred,
2962         };
2963         struct rpc_task_setup task_setup_data = {
2964                 .rpc_client = server->client,
2965                 .rpc_message = &msg,
2966                 .callback_ops = &nfs4_close_ops,
2967                 .workqueue = nfsiod_workqueue,
2968                 .flags = RPC_TASK_ASYNC,
2969         };
2970         int status = -ENOMEM;
2971
2972         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2973                 &task_setup_data.rpc_client, &msg);
2974
2975         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2976         if (calldata == NULL)
2977                 goto out;
2978         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2979         calldata->inode = state->inode;
2980         calldata->state = state;
2981         calldata->arg.fh = NFS_FH(state->inode);
2982         /* Serialization for the sequence id */
2983         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
2984         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2985         if (IS_ERR(calldata->arg.seqid))
2986                 goto out_free_calldata;
2987         calldata->arg.fmode = 0;
2988         calldata->arg.bitmask = server->cache_consistency_bitmask;
2989         calldata->res.fattr = &calldata->fattr;
2990         calldata->res.seqid = calldata->arg.seqid;
2991         calldata->res.server = server;
2992         calldata->roc = nfs4_roc(state->inode);
2993         nfs_sb_active(calldata->inode->i_sb);
2994
2995         msg.rpc_argp = &calldata->arg;
2996         msg.rpc_resp = &calldata->res;
2997         task_setup_data.callback_data = calldata;
2998         task = rpc_run_task(&task_setup_data);
2999         if (IS_ERR(task))
3000                 return PTR_ERR(task);
3001         status = 0;
3002         if (wait)
3003                 status = rpc_wait_for_completion_task(task);
3004         rpc_put_task(task);
3005         return status;
3006 out_free_calldata:
3007         kfree(calldata);
3008 out:
3009         nfs4_put_open_state(state);
3010         nfs4_put_state_owner(sp);
3011         return status;
3012 }
3013
3014 static struct inode *
3015 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3016                 int open_flags, struct iattr *attr, int *opened)
3017 {
3018         struct nfs4_state *state;
3019         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3020
3021         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3022
3023         /* Protect against concurrent sillydeletes */
3024         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3025
3026         nfs4_label_release_security(label);
3027
3028         if (IS_ERR(state))
3029                 return ERR_CAST(state);
3030         return state->inode;
3031 }
3032
3033 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3034 {
3035         if (ctx->state == NULL)
3036                 return;
3037         if (is_sync)
3038                 nfs4_close_sync(ctx->state, ctx->mode);
3039         else
3040                 nfs4_close_state(ctx->state, ctx->mode);
3041 }
3042
3043 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3044 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3045 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
3046
3047 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3048 {
3049         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3050         struct nfs4_server_caps_arg args = {
3051                 .fhandle = fhandle,
3052                 .bitmask = bitmask,
3053         };
3054         struct nfs4_server_caps_res res = {};
3055         struct rpc_message msg = {
3056                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3057                 .rpc_argp = &args,
3058                 .rpc_resp = &res,
3059         };
3060         int status;
3061
3062         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3063                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3064                      FATTR4_WORD0_LINK_SUPPORT |
3065                      FATTR4_WORD0_SYMLINK_SUPPORT |
3066                      FATTR4_WORD0_ACLSUPPORT;
3067         if (minorversion)
3068                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3069
3070         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3071         if (status == 0) {
3072                 /* Sanity check the server answers */
3073                 switch (minorversion) {
3074                 case 0:
3075                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3076                         res.attr_bitmask[2] = 0;
3077                         break;
3078                 case 1:
3079                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3080                         break;
3081                 case 2:
3082                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3083                 }
3084                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3085                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3086                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3087                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3088                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3089                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
3090                                 NFS_CAP_SECURITY_LABEL);
3091                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3092                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3093                         server->caps |= NFS_CAP_ACLS;
3094                 if (res.has_links != 0)
3095                         server->caps |= NFS_CAP_HARDLINKS;
3096                 if (res.has_symlinks != 0)
3097                         server->caps |= NFS_CAP_SYMLINKS;
3098                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3099                         server->caps |= NFS_CAP_FILEID;
3100                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3101                         server->caps |= NFS_CAP_MODE;
3102                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3103                         server->caps |= NFS_CAP_NLINK;
3104                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3105                         server->caps |= NFS_CAP_OWNER;
3106                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3107                         server->caps |= NFS_CAP_OWNER_GROUP;
3108                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3109                         server->caps |= NFS_CAP_ATIME;
3110                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3111                         server->caps |= NFS_CAP_CTIME;
3112                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3113                         server->caps |= NFS_CAP_MTIME;
3114 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3115                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3116                         server->caps |= NFS_CAP_SECURITY_LABEL;
3117 #endif
3118                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3119                                 sizeof(server->attr_bitmask));
3120                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3121
3122                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3123                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3124                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3125                 server->cache_consistency_bitmask[2] = 0;
3126                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3127                         sizeof(server->exclcreat_bitmask));
3128                 server->acl_bitmask = res.acl_bitmask;
3129                 server->fh_expire_type = res.fh_expire_type;
3130         }
3131
3132         return status;
3133 }
3134
3135 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3136 {
3137         struct nfs4_exception exception = { };
3138         int err;
3139         do {
3140                 err = nfs4_handle_exception(server,
3141                                 _nfs4_server_capabilities(server, fhandle),
3142                                 &exception);
3143         } while (exception.retry);
3144         return err;
3145 }
3146
3147 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3148                 struct nfs_fsinfo *info)
3149 {
3150         u32 bitmask[3];
3151         struct nfs4_lookup_root_arg args = {
3152                 .bitmask = bitmask,
3153         };
3154         struct nfs4_lookup_res res = {
3155                 .server = server,
3156                 .fattr = info->fattr,
3157                 .fh = fhandle,
3158         };
3159         struct rpc_message msg = {
3160                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3161                 .rpc_argp = &args,
3162                 .rpc_resp = &res,
3163         };
3164
3165         bitmask[0] = nfs4_fattr_bitmap[0];
3166         bitmask[1] = nfs4_fattr_bitmap[1];
3167         /*
3168          * Process the label in the upcoming getfattr
3169          */
3170         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3171
3172         nfs_fattr_init(info->fattr);
3173         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3174 }
3175
3176 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3177                 struct nfs_fsinfo *info)
3178 {
3179         struct nfs4_exception exception = { };
3180         int err;
3181         do {
3182                 err = _nfs4_lookup_root(server, fhandle, info);
3183                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3184                 switch (err) {
3185                 case 0:
3186                 case -NFS4ERR_WRONGSEC:
3187                         goto out;
3188                 default:
3189                         err = nfs4_handle_exception(server, err, &exception);
3190                 }
3191         } while (exception.retry);
3192 out:
3193         return err;
3194 }
3195
3196 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3197                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3198 {
3199         struct rpc_auth_create_args auth_args = {
3200                 .pseudoflavor = flavor,
3201         };
3202         struct rpc_auth *auth;
3203         int ret;
3204
3205         auth = rpcauth_create(&auth_args, server->client);
3206         if (IS_ERR(auth)) {
3207                 ret = -EACCES;
3208                 goto out;
3209         }
3210         ret = nfs4_lookup_root(server, fhandle, info);
3211 out:
3212         return ret;
3213 }
3214
3215 /*
3216  * Retry pseudoroot lookup with various security flavors.  We do this when:
3217  *
3218  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3219  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3220  *
3221  * Returns zero on success, or a negative NFS4ERR value, or a
3222  * negative errno value.
3223  */
3224 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3225                               struct nfs_fsinfo *info)
3226 {
3227         /* Per 3530bis 15.33.5 */
3228         static const rpc_authflavor_t flav_array[] = {
3229                 RPC_AUTH_GSS_KRB5P,
3230                 RPC_AUTH_GSS_KRB5I,
3231                 RPC_AUTH_GSS_KRB5,
3232                 RPC_AUTH_UNIX,                  /* courtesy */
3233                 RPC_AUTH_NULL,
3234         };
3235         int status = -EPERM;
3236         size_t i;
3237
3238         if (server->auth_info.flavor_len > 0) {
3239                 /* try each flavor specified by user */
3240                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3241                         status = nfs4_lookup_root_sec(server, fhandle, info,
3242                                                 server->auth_info.flavors[i]);
3243                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3244                                 continue;
3245                         break;
3246                 }
3247         } else {
3248                 /* no flavors specified by user, try default list */
3249                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3250                         status = nfs4_lookup_root_sec(server, fhandle, info,
3251                                                       flav_array[i]);
3252                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3253                                 continue;
3254                         break;
3255                 }
3256         }
3257
3258         /*
3259          * -EACCESS could mean that the user doesn't have correct permissions
3260          * to access the mount.  It could also mean that we tried to mount
3261          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3262          * existing mount programs don't handle -EACCES very well so it should
3263          * be mapped to -EPERM instead.
3264          */
3265         if (status == -EACCES)
3266                 status = -EPERM;
3267         return status;
3268 }
3269
3270 static int nfs4_do_find_root_sec(struct nfs_server *server,
3271                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3272 {
3273         int mv = server->nfs_client->cl_minorversion;
3274         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3275 }
3276
3277 /**
3278  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3279  * @server: initialized nfs_server handle
3280  * @fhandle: we fill in the pseudo-fs root file handle
3281  * @info: we fill in an FSINFO struct
3282  * @auth_probe: probe the auth flavours
3283  *
3284  * Returns zero on success, or a negative errno.
3285  */
3286 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3287                          struct nfs_fsinfo *info,
3288                          bool auth_probe)
3289 {
3290         int status = 0;
3291
3292         if (!auth_probe)
3293                 status = nfs4_lookup_root(server, fhandle, info);
3294
3295         if (auth_probe || status == NFS4ERR_WRONGSEC)
3296                 status = nfs4_do_find_root_sec(server, fhandle, info);
3297
3298         if (status == 0)
3299                 status = nfs4_server_capabilities(server, fhandle);
3300         if (status == 0)
3301                 status = nfs4_do_fsinfo(server, fhandle, info);
3302
3303         return nfs4_map_errors(status);
3304 }
3305
3306 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3307                               struct nfs_fsinfo *info)
3308 {
3309         int error;
3310         struct nfs_fattr *fattr = info->fattr;
3311         struct nfs4_label *label = NULL;
3312
3313         error = nfs4_server_capabilities(server, mntfh);
3314         if (error < 0) {
3315                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3316                 return error;
3317         }
3318
3319         label = nfs4_label_alloc(server, GFP_KERNEL);
3320         if (IS_ERR(label))
3321                 return PTR_ERR(label);
3322
3323         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3324         if (error < 0) {
3325                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3326                 goto err_free_label;
3327         }
3328
3329         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3330             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3331                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3332
3333 err_free_label:
3334         nfs4_label_free(label);
3335
3336         return error;
3337 }
3338
3339 /*
3340  * Get locations and (maybe) other attributes of a referral.
3341  * Note that we'll actually follow the referral later when
3342  * we detect fsid mismatch in inode revalidation
3343  */
3344 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3345                              const struct qstr *name, struct nfs_fattr *fattr,
3346                              struct nfs_fh *fhandle)
3347 {
3348         int status = -ENOMEM;
3349         struct page *page = NULL;
3350         struct nfs4_fs_locations *locations = NULL;
3351
3352         page = alloc_page(GFP_KERNEL);
3353         if (page == NULL)
3354                 goto out;
3355         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3356         if (locations == NULL)
3357                 goto out;
3358
3359         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3360         if (status != 0)
3361                 goto out;
3362
3363         /*
3364          * If the fsid didn't change, this is a migration event, not a
3365          * referral.  Cause us to drop into the exception handler, which
3366          * will kick off migration recovery.
3367          */
3368         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3369                 dprintk("%s: server did not return a different fsid for"
3370                         " a referral at %s\n", __func__, name->name);
3371                 status = -NFS4ERR_MOVED;
3372                 goto out;
3373         }
3374         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3375         nfs_fixup_referral_attributes(&locations->fattr);
3376
3377         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3378         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3379         memset(fhandle, 0, sizeof(struct nfs_fh));
3380 out:
3381         if (page)
3382                 __free_page(page);
3383         kfree(locations);
3384         return status;
3385 }
3386
3387 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3388                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3389 {
3390         struct nfs4_getattr_arg args = {
3391                 .fh = fhandle,
3392                 .bitmask = server->attr_bitmask,
3393         };
3394         struct nfs4_getattr_res res = {
3395                 .fattr = fattr,
3396                 .label = label,
3397                 .server = server,
3398         };
3399         struct rpc_message msg = {
3400                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3401                 .rpc_argp = &args,
3402                 .rpc_resp = &res,
3403         };
3404
3405         args.bitmask = nfs4_bitmask(server, label);
3406
3407         nfs_fattr_init(fattr);
3408         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3409 }
3410
3411 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3412                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3413 {
3414         struct nfs4_exception exception = { };
3415         int err;
3416         do {
3417                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3418                 trace_nfs4_getattr(server, fhandle, fattr, err);
3419                 err = nfs4_handle_exception(server, err,
3420                                 &exception);
3421         } while (exception.retry);
3422         return err;
3423 }
3424
3425 /*
3426  * The file is not closed if it is opened due to the a request to change
3427  * the size of the file. The open call will not be needed once the
3428  * VFS layer lookup-intents are implemented.
3429  *
3430  * Close is called when the inode is destroyed.
3431  * If we haven't opened the file for O_WRONLY, we
3432  * need to in the size_change case to obtain a stateid.
3433  *
3434  * Got race?
3435  * Because OPEN is always done by name in nfsv4, it is
3436  * possible that we opened a different file by the same
3437  * name.  We can recognize this race condition, but we
3438  * can't do anything about it besides returning an error.
3439  *
3440  * This will be fixed with VFS changes (lookup-intent).
3441  */
3442 static int
3443 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3444                   struct iattr *sattr)
3445 {
3446         struct inode *inode = d_inode(dentry);
3447         struct rpc_cred *cred = NULL;
3448         struct nfs4_state *state = NULL;
3449         struct nfs4_label *label = NULL;
3450         int status;
3451
3452         if (pnfs_ld_layoutret_on_setattr(inode) &&
3453             sattr->ia_valid & ATTR_SIZE &&
3454             sattr->ia_size < i_size_read(inode))
3455                 pnfs_commit_and_return_layout(inode);
3456
3457         nfs_fattr_init(fattr);
3458
3459         /* Deal with open(O_TRUNC) */
3460         if (sattr->ia_valid & ATTR_OPEN)
3461                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3462
3463         /* Optimization: if the end result is no change, don't RPC */
3464         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3465                 return 0;
3466
3467         /* Search for an existing open(O_WRITE) file */
3468         if (sattr->ia_valid & ATTR_FILE) {
3469                 struct nfs_open_context *ctx;
3470
3471                 ctx = nfs_file_open_context(sattr->ia_file);
3472                 if (ctx) {
3473                         cred = ctx->cred;
3474                         state = ctx->state;
3475                 }
3476         }
3477
3478         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3479         if (IS_ERR(label))
3480                 return PTR_ERR(label);
3481
3482         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3483         if (status == 0) {
3484                 nfs_setattr_update_inode(inode, sattr, fattr);
3485                 nfs_setsecurity(inode, fattr, label);
3486         }
3487         nfs4_label_free(label);
3488         return status;
3489 }
3490
3491 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3492                 const struct qstr *name, struct nfs_fh *fhandle,
3493                 struct nfs_fattr *fattr, struct nfs4_label *label)
3494 {
3495         struct nfs_server *server = NFS_SERVER(dir);
3496         int                    status;
3497         struct nfs4_lookup_arg args = {
3498                 .bitmask = server->attr_bitmask,
3499                 .dir_fh = NFS_FH(dir),
3500                 .name = name,
3501         };
3502         struct nfs4_lookup_res res = {
3503                 .server = server,
3504                 .fattr = fattr,
3505                 .label = label,
3506                 .fh = fhandle,
3507         };
3508         struct rpc_message msg = {
3509                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3510                 .rpc_argp = &args,
3511                 .rpc_resp = &res,
3512         };
3513
3514         args.bitmask = nfs4_bitmask(server, label);
3515
3516         nfs_fattr_init(fattr);
3517
3518         dprintk("NFS call  lookup %s\n", name->name);
3519         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3520         dprintk("NFS reply lookup: %d\n", status);
3521         return status;
3522 }
3523
3524 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3525 {
3526         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3527                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3528         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3529         fattr->nlink = 2;
3530 }
3531
3532 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3533                                    struct qstr *name, struct nfs_fh *fhandle,
3534                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3535 {
3536         struct nfs4_exception exception = { };
3537         struct rpc_clnt *client = *clnt;
3538         int err;
3539         do {
3540                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3541                 trace_nfs4_lookup(dir, name, err);
3542                 switch (err) {
3543                 case -NFS4ERR_BADNAME:
3544                         err = -ENOENT;
3545                         goto out;
3546                 case -NFS4ERR_MOVED:
3547                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3548                         if (err == -NFS4ERR_MOVED)
3549                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3550                         goto out;
3551                 case -NFS4ERR_WRONGSEC:
3552                         err = -EPERM;
3553                         if (client != *clnt)
3554                                 goto out;
3555                         client = nfs4_negotiate_security(client, dir, name);
3556                         if (IS_ERR(client))
3557                                 return PTR_ERR(client);
3558
3559                         exception.retry = 1;
3560                         break;
3561                 default:
3562                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3563                 }
3564         } while (exception.retry);
3565
3566 out:
3567         if (err == 0)
3568                 *clnt = client;
3569         else if (client != *clnt)
3570                 rpc_shutdown_client(client);
3571
3572         return err;
3573 }
3574
3575 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3576                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3577                             struct nfs4_label *label)
3578 {
3579         int status;
3580         struct rpc_clnt *client = NFS_CLIENT(dir);
3581
3582         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3583         if (client != NFS_CLIENT(dir)) {
3584                 rpc_shutdown_client(client);
3585                 nfs_fixup_secinfo_attributes(fattr);
3586         }
3587         return status;
3588 }
3589
3590 struct rpc_clnt *
3591 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3592                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3593 {
3594         struct rpc_clnt *client = NFS_CLIENT(dir);
3595         int status;
3596
3597         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3598         if (status < 0)
3599                 return ERR_PTR(status);
3600         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3601 }
3602
3603 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3604 {
3605         struct nfs_server *server = NFS_SERVER(inode);
3606         struct nfs4_accessargs args = {
3607                 .fh = NFS_FH(inode),
3608                 .bitmask = server->cache_consistency_bitmask,
3609         };
3610         struct nfs4_accessres res = {
3611                 .server = server,
3612         };
3613         struct rpc_message msg = {
3614                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3615                 .rpc_argp = &args,
3616                 .rpc_resp = &res,
3617                 .rpc_cred = entry->cred,
3618         };
3619         int mode = entry->mask;
3620         int status = 0;
3621
3622         /*
3623          * Determine which access bits we want to ask for...
3624          */
3625         if (mode & MAY_READ)
3626                 args.access |= NFS4_ACCESS_READ;
3627         if (S_ISDIR(inode->i_mode)) {
3628                 if (mode & MAY_WRITE)
3629                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3630                 if (mode & MAY_EXEC)
3631                         args.access |= NFS4_ACCESS_LOOKUP;
3632         } else {
3633                 if (mode & MAY_WRITE)
3634                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3635                 if (mode & MAY_EXEC)
3636                         args.access |= NFS4_ACCESS_EXECUTE;
3637         }
3638
3639         res.fattr = nfs_alloc_fattr();
3640         if (res.fattr == NULL)
3641                 return -ENOMEM;
3642
3643         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3644         if (!status) {
3645                 nfs_access_set_mask(entry, res.access);
3646                 nfs_refresh_inode(inode, res.fattr);
3647         }
3648         nfs_free_fattr(res.fattr);
3649         return status;
3650 }
3651
3652 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3653 {
3654         struct nfs4_exception exception = { };
3655         int err;
3656         do {
3657                 err = _nfs4_proc_access(inode, entry);
3658                 trace_nfs4_access(inode, err);
3659                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3660                                 &exception);
3661         } while (exception.retry);
3662         return err;
3663 }
3664
3665 /*
3666  * TODO: For the time being, we don't try to get any attributes
3667  * along with any of the zero-copy operations READ, READDIR,
3668  * READLINK, WRITE.
3669  *
3670  * In the case of the first three, we want to put the GETATTR
3671  * after the read-type operation -- this is because it is hard
3672  * to predict the length of a GETATTR response in v4, and thus
3673  * align the READ data correctly.  This means that the GETATTR
3674  * may end up partially falling into the page cache, and we should
3675  * shift it into the 'tail' of the xdr_buf before processing.
3676  * To do this efficiently, we need to know the total length
3677  * of data received, which doesn't seem to be available outside
3678  * of the RPC layer.
3679  *
3680  * In the case of WRITE, we also want to put the GETATTR after
3681  * the operation -- in this case because we want to make sure
3682  * we get the post-operation mtime and size.
3683  *
3684  * Both of these changes to the XDR layer would in fact be quite
3685  * minor, but I decided to leave them for a subsequent patch.
3686  */
3687 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3688                 unsigned int pgbase, unsigned int pglen)
3689 {
3690         struct nfs4_readlink args = {
3691                 .fh       = NFS_FH(inode),
3692                 .pgbase   = pgbase,
3693                 .pglen    = pglen,
3694                 .pages    = &page,
3695         };
3696         struct nfs4_readlink_res res;
3697         struct rpc_message msg = {
3698                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3699                 .rpc_argp = &args,
3700                 .rpc_resp = &res,
3701         };
3702
3703         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3704 }
3705
3706 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3707                 unsigned int pgbase, unsigned int pglen)
3708 {
3709         struct nfs4_exception exception = { };
3710         int err;
3711         do {
3712                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3713                 trace_nfs4_readlink(inode, err);
3714                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3715                                 &exception);
3716         } while (exception.retry);
3717         return err;
3718 }
3719
3720 /*
3721  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3722  */
3723 static int
3724 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3725                  int flags)
3726 {
3727         struct nfs4_label l, *ilabel = NULL;
3728         struct nfs_open_context *ctx;
3729         struct nfs4_state *state;
3730         int status = 0;
3731
3732         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3733         if (IS_ERR(ctx))
3734                 return PTR_ERR(ctx);
3735
3736         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3737
3738         sattr->ia_mode &= ~current_umask();
3739         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
3740         if (IS_ERR(state)) {
3741                 status = PTR_ERR(state);
3742                 goto out;
3743         }
3744 out:
3745         nfs4_label_release_security(ilabel);
3746         put_nfs_open_context(ctx);
3747         return status;
3748 }
3749
3750 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3751 {
3752         struct nfs_server *server = NFS_SERVER(dir);
3753         struct nfs_removeargs args = {
3754                 .fh = NFS_FH(dir),
3755                 .name = *name,
3756         };
3757         struct nfs_removeres res = {
3758                 .server = server,
3759         };
3760         struct rpc_message msg = {
3761                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3762                 .rpc_argp = &args,
3763                 .rpc_resp = &res,
3764         };
3765         int status;
3766
3767         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3768         if (status == 0)
3769                 update_changeattr(dir, &res.cinfo);
3770         return status;
3771 }
3772
3773 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3774 {
3775         struct nfs4_exception exception = { };
3776         int err;
3777         do {
3778                 err = _nfs4_proc_remove(dir, name);
3779                 trace_nfs4_remove(dir, name, err);
3780                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3781                                 &exception);
3782         } while (exception.retry);
3783         return err;
3784 }
3785
3786 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3787 {
3788         struct nfs_server *server = NFS_SERVER(dir);
3789         struct nfs_removeargs *args = msg->rpc_argp;
3790         struct nfs_removeres *res = msg->rpc_resp;
3791
3792         res->server = server;
3793         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3794         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3795
3796         nfs_fattr_init(res->dir_attr);
3797 }
3798
3799 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3800 {
3801         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb),
3802                         &data->args.seq_args,
3803                         &data->res.seq_res,
3804                         task);
3805 }
3806
3807 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3808 {
3809         struct nfs_unlinkdata *data = task->tk_calldata;
3810         struct nfs_removeres *res = &data->res;
3811
3812         if (!nfs4_sequence_done(task, &res->seq_res))
3813                 return 0;
3814         if (nfs4_async_handle_error(task, res->server, NULL,
3815                                     &data->timeout) == -EAGAIN)
3816                 return 0;
3817         update_changeattr(dir, &res->cinfo);
3818         return 1;
3819 }
3820
3821 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3822 {
3823         struct nfs_server *server = NFS_SERVER(dir);
3824         struct nfs_renameargs *arg = msg->rpc_argp;
3825         struct nfs_renameres *res = msg->rpc_resp;
3826
3827         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3828         res->server = server;
3829         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3830 }
3831
3832 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3833 {
3834         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3835                         &data->args.seq_args,
3836                         &data->res.seq_res,
3837                         task);
3838 }
3839
3840 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3841                                  struct inode *new_dir)
3842 {
3843         struct nfs_renamedata *data = task->tk_calldata;
3844         struct nfs_renameres *res = &data->res;
3845
3846         if (!nfs4_sequence_done(task, &res->seq_res))
3847                 return 0;
3848         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3849                 return 0;
3850
3851         update_changeattr(old_dir, &res->old_cinfo);
3852         update_changeattr(new_dir, &res->new_cinfo);
3853         return 1;
3854 }
3855
3856 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3857 {
3858         struct nfs_server *server = NFS_SERVER(inode);
3859         struct nfs4_link_arg arg = {
3860                 .fh     = NFS_FH(inode),
3861                 .dir_fh = NFS_FH(dir),
3862                 .name   = name,
3863                 .bitmask = server->attr_bitmask,
3864         };
3865         struct nfs4_link_res res = {
3866                 .server = server,
3867                 .label = NULL,
3868         };
3869         struct rpc_message msg = {
3870                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3871                 .rpc_argp = &arg,
3872                 .rpc_resp = &res,
3873         };
3874         int status = -ENOMEM;
3875
3876         res.fattr = nfs_alloc_fattr();
3877         if (res.fattr == NULL)
3878                 goto out;
3879
3880         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3881         if (IS_ERR(res.label)) {
3882                 status = PTR_ERR(res.label);
3883                 goto out;
3884         }
3885         arg.bitmask = nfs4_bitmask(server, res.label);
3886
3887         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3888         if (!status) {
3889                 update_changeattr(dir, &res.cinfo);
3890                 status = nfs_post_op_update_inode(inode, res.fattr);
3891                 if (!status)
3892                         nfs_setsecurity(inode, res.fattr, res.label);
3893         }
3894
3895
3896         nfs4_label_free(res.label);
3897
3898 out:
3899         nfs_free_fattr(res.fattr);
3900         return status;
3901 }
3902
3903 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3904 {
3905         struct nfs4_exception exception = { };
3906         int err;
3907         do {
3908                 err = nfs4_handle_exception(NFS_SERVER(inode),
3909                                 _nfs4_proc_link(inode, dir, name),
3910                                 &exception);
3911         } while (exception.retry);
3912         return err;
3913 }
3914
3915 struct nfs4_createdata {
3916         struct rpc_message msg;
3917         struct nfs4_create_arg arg;
3918         struct nfs4_create_res res;
3919         struct nfs_fh fh;
3920         struct nfs_fattr fattr;
3921         struct nfs4_label *label;
3922 };
3923
3924 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3925                 struct qstr *name, struct iattr *sattr, u32 ftype)
3926 {
3927         struct nfs4_createdata *data;
3928
3929         data = kzalloc(sizeof(*data), GFP_KERNEL);
3930         if (data != NULL) {
3931                 struct nfs_server *server = NFS_SERVER(dir);
3932
3933                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3934                 if (IS_ERR(data->label))
3935                         goto out_free;
3936
3937                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3938                 data->msg.rpc_argp = &data->arg;
3939                 data->msg.rpc_resp = &data->res;
3940                 data->arg.dir_fh = NFS_FH(dir);
3941                 data->arg.server = server;
3942                 data->arg.name = name;
3943                 data->arg.attrs = sattr;
3944                 data->arg.ftype = ftype;
3945                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3946                 data->res.server = server;
3947                 data->res.fh = &data->fh;
3948                 data->res.fattr = &data->fattr;
3949                 data->res.label = data->label;
3950                 nfs_fattr_init(data->res.fattr);
3951         }
3952         return data;
3953 out_free:
3954         kfree(data);
3955         return NULL;
3956 }
3957
3958 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3959 {
3960         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3961                                     &data->arg.seq_args, &data->res.seq_res, 1);
3962         if (status == 0) {
3963                 update_changeattr(dir, &data->res.dir_cinfo);
3964                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3965         }
3966         return status;
3967 }
3968
3969 static void nfs4_free_createdata(struct nfs4_createdata *data)
3970 {
3971         nfs4_label_free(data->label);
3972         kfree(data);
3973 }
3974
3975 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3976                 struct page *page, unsigned int len, struct iattr *sattr,
3977                 struct nfs4_label *label)
3978 {
3979         struct nfs4_createdata *data;
3980         int status = -ENAMETOOLONG;
3981
3982         if (len > NFS4_MAXPATHLEN)
3983                 goto out;
3984
3985         status = -ENOMEM;
3986         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3987         if (data == NULL)
3988                 goto out;
3989
3990         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3991         data->arg.u.symlink.pages = &page;
3992         data->arg.u.symlink.len = len;
3993         data->arg.label = label;
3994
3995         status = nfs4_do_create(dir, dentry, data);
3996
3997         nfs4_free_createdata(data);
3998 out:
3999         return status;
4000 }
4001
4002 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4003                 struct page *page, unsigned int len, struct iattr *sattr)
4004 {
4005         struct nfs4_exception exception = { };
4006         struct nfs4_label l, *label = NULL;
4007         int err;
4008
4009         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4010
4011         do {
4012                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
4013                 trace_nfs4_symlink(dir, &dentry->d_name, err);
4014                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4015                                 &exception);
4016         } while (exception.retry);
4017
4018         nfs4_label_release_security(label);
4019         return err;
4020 }
4021
4022 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4023                 struct iattr *sattr, struct nfs4_label *label)
4024 {
4025         struct nfs4_createdata *data;
4026         int status = -ENOMEM;
4027
4028         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4029         if (data == NULL)
4030                 goto out;
4031
4032         data->arg.label = label;
4033         status = nfs4_do_create(dir, dentry, data);
4034
4035         nfs4_free_createdata(data);
4036 out:
4037         return status;
4038 }
4039
4040 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4041                 struct iattr *sattr)
4042 {
4043         struct nfs4_exception exception = { };
4044         struct nfs4_label l, *label = NULL;
4045         int err;
4046
4047         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4048
4049         sattr->ia_mode &= ~current_umask();
4050         do {
4051                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4052                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4053                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4054                                 &exception);
4055         } while (exception.retry);
4056         nfs4_label_release_security(label);
4057
4058         return err;
4059 }
4060
4061 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4062                 u64 cookie, struct page **pages, unsigned int count, int plus)
4063 {
4064         struct inode            *dir = d_inode(dentry);
4065         struct nfs4_readdir_arg args = {
4066                 .fh = NFS_FH(dir),
4067                 .pages = pages,
4068                 .pgbase = 0,
4069                 .count = count,
4070                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4071                 .plus = plus,
4072         };
4073         struct nfs4_readdir_res res;
4074         struct rpc_message msg = {
4075                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4076                 .rpc_argp = &args,
4077                 .rpc_resp = &res,
4078                 .rpc_cred = cred,
4079         };
4080         int                     status;
4081
4082         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4083                         dentry,
4084                         (unsigned long long)cookie);
4085         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4086         res.pgbase = args.pgbase;
4087         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4088         if (status >= 0) {
4089                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4090                 status += args.pgbase;
4091         }
4092
4093         nfs_invalidate_atime(dir);
4094
4095         dprintk("%s: returns %d\n", __func__, status);
4096         return status;
4097 }
4098
4099 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4100                 u64 cookie, struct page **pages, unsigned int count, int plus)
4101 {
4102         struct nfs4_exception exception = { };
4103         int err;
4104         do {
4105                 err = _nfs4_proc_readdir(dentry, cred, cookie,
4106                                 pages, count, plus);
4107                 trace_nfs4_readdir(d_inode(dentry), err);
4108                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4109                                 &exception);
4110         } while (exception.retry);
4111         return err;
4112 }
4113
4114 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4115                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4116 {
4117         struct nfs4_createdata *data;
4118         int mode = sattr->ia_mode;
4119         int status = -ENOMEM;
4120
4121         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
4122         if (data == NULL)
4123                 goto out;
4124
4125         if (S_ISFIFO(mode))
4126                 data->arg.ftype = NF4FIFO;
4127         else if (S_ISBLK(mode)) {
4128                 data->arg.ftype = NF4BLK;
4129                 data->arg.u.device.specdata1 = MAJOR(rdev);
4130                 data->arg.u.device.specdata2 = MINOR(rdev);
4131         }
4132         else if (S_ISCHR(mode)) {
4133                 data->arg.ftype = NF4CHR;
4134                 data->arg.u.device.specdata1 = MAJOR(rdev);
4135                 data->arg.u.device.specdata2 = MINOR(rdev);
4136         } else if (!S_ISSOCK(mode)) {
4137                 status = -EINVAL;
4138                 goto out_free;
4139         }
4140
4141         data->arg.label = label;
4142         status = nfs4_do_create(dir, dentry, data);
4143 out_free:
4144         nfs4_free_createdata(data);
4145 out:
4146         return status;
4147 }
4148
4149 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4150                 struct iattr *sattr, dev_t rdev)
4151 {
4152         struct nfs4_exception exception = { };
4153         struct nfs4_label l, *label = NULL;
4154         int err;
4155
4156         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4157
4158         sattr->ia_mode &= ~current_umask();
4159         do {
4160                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4161                 trace_nfs4_mknod(dir, &dentry->d_name, err);
4162                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4163                                 &exception);
4164         } while (exception.retry);
4165
4166         nfs4_label_release_security(label);
4167
4168         return err;
4169 }
4170
4171 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
4172                  struct nfs_fsstat *fsstat)
4173 {
4174         struct nfs4_statfs_arg args = {
4175                 .fh = fhandle,
4176                 .bitmask = server->attr_bitmask,
4177         };
4178         struct nfs4_statfs_res res = {
4179                 .fsstat = fsstat,
4180         };
4181         struct rpc_message msg = {
4182                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
4183                 .rpc_argp = &args,
4184                 .rpc_resp = &res,
4185         };
4186
4187         nfs_fattr_init(fsstat->fattr);
4188         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4189 }
4190
4191 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4192 {
4193         struct nfs4_exception exception = { };
4194         int err;
4195         do {
4196                 err = nfs4_handle_exception(server,
4197                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4198                                 &exception);
4199         } while (exception.retry);
4200         return err;
4201 }
4202
4203 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4204                 struct nfs_fsinfo *fsinfo)
4205 {
4206         struct nfs4_fsinfo_arg args = {
4207                 .fh = fhandle,
4208                 .bitmask = server->attr_bitmask,
4209         };
4210         struct nfs4_fsinfo_res res = {
4211                 .fsinfo = fsinfo,
4212         };
4213         struct rpc_message msg = {
4214                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4215                 .rpc_argp = &args,
4216                 .rpc_resp = &res,
4217         };
4218
4219         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4220 }
4221
4222 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4223 {
4224         struct nfs4_exception exception = { };
4225         unsigned long now = jiffies;
4226         int err;
4227
4228         do {
4229                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4230                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4231                 if (err == 0) {
4232                         struct nfs_client *clp = server->nfs_client;
4233
4234                         spin_lock(&clp->cl_lock);
4235                         clp->cl_lease_time = fsinfo->lease_time * HZ;
4236                         clp->cl_last_renewal = now;
4237                         spin_unlock(&clp->cl_lock);
4238                         break;
4239                 }
4240                 err = nfs4_handle_exception(server, err, &exception);
4241         } while (exception.retry);
4242         return err;
4243 }
4244
4245 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4246 {
4247         int error;
4248
4249         nfs_fattr_init(fsinfo->fattr);
4250         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4251         if (error == 0) {
4252                 /* block layout checks this! */
4253                 server->pnfs_blksize = fsinfo->blksize;
4254                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4255         }
4256
4257         return error;
4258 }
4259
4260 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4261                 struct nfs_pathconf *pathconf)
4262 {
4263         struct nfs4_pathconf_arg args = {
4264                 .fh = fhandle,
4265                 .bitmask = server->attr_bitmask,
4266         };
4267         struct nfs4_pathconf_res res = {
4268                 .pathconf = pathconf,
4269         };
4270         struct rpc_message msg = {
4271                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4272                 .rpc_argp = &args,
4273                 .rpc_resp = &res,
4274         };
4275
4276         /* None of the pathconf attributes are mandatory to implement */
4277         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4278                 memset(pathconf, 0, sizeof(*pathconf));
4279                 return 0;
4280         }
4281
4282         nfs_fattr_init(pathconf->fattr);
4283         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4284 }
4285
4286 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4287                 struct nfs_pathconf *pathconf)
4288 {
4289         struct nfs4_exception exception = { };
4290         int err;
4291
4292         do {
4293                 err = nfs4_handle_exception(server,
4294                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4295                                 &exception);
4296         } while (exception.retry);
4297         return err;
4298 }
4299
4300 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4301                 const struct nfs_open_context *ctx,
4302                 const struct nfs_lock_context *l_ctx,
4303                 fmode_t fmode)
4304 {
4305         const struct nfs_lockowner *lockowner = NULL;
4306
4307         if (l_ctx != NULL)
4308                 lockowner = &l_ctx->lockowner;
4309         return nfs4_select_rw_stateid(ctx->state, fmode, lockowner, stateid, NULL);
4310 }
4311 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4312
4313 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4314                 const struct nfs_open_context *ctx,
4315                 const struct nfs_lock_context *l_ctx,
4316                 fmode_t fmode)
4317 {
4318         nfs4_stateid current_stateid;
4319
4320         /* If the current stateid represents a lost lock, then exit */
4321         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4322                 return true;
4323         return nfs4_stateid_match(stateid, &current_stateid);
4324 }
4325
4326 static bool nfs4_error_stateid_expired(int err)
4327 {
4328         switch (err) {
4329         case -NFS4ERR_DELEG_REVOKED:
4330         case -NFS4ERR_ADMIN_REVOKED:
4331         case -NFS4ERR_BAD_STATEID:
4332         case -NFS4ERR_STALE_STATEID:
4333         case -NFS4ERR_OLD_STATEID:
4334         case -NFS4ERR_OPENMODE:
4335         case -NFS4ERR_EXPIRED:
4336                 return true;
4337         }
4338         return false;
4339 }
4340
4341 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4342 {
4343         nfs_invalidate_atime(hdr->inode);
4344 }
4345
4346 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4347 {
4348         struct nfs_server *server = NFS_SERVER(hdr->inode);
4349
4350         trace_nfs4_read(hdr, task->tk_status);
4351         if (nfs4_async_handle_error(task, server,
4352                                     hdr->args.context->state,
4353                                     NULL) == -EAGAIN) {
4354                 rpc_restart_call_prepare(task);
4355                 return -EAGAIN;
4356         }
4357
4358         __nfs4_read_done_cb(hdr);
4359         if (task->tk_status > 0)
4360                 renew_lease(server, hdr->timestamp);
4361         return 0;
4362 }
4363
4364 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4365                 struct nfs_pgio_args *args)
4366 {
4367
4368         if (!nfs4_error_stateid_expired(task->tk_status) ||
4369                 nfs4_stateid_is_current(&args->stateid,
4370                                 args->context,
4371                                 args->lock_context,
4372                                 FMODE_READ))
4373                 return false;
4374         rpc_restart_call_prepare(task);
4375         return true;
4376 }
4377
4378 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4379 {
4380
4381         dprintk("--> %s\n", __func__);
4382
4383         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4384                 return -EAGAIN;
4385         if (nfs4_read_stateid_changed(task, &hdr->args))
4386                 return -EAGAIN;
4387         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4388                                     nfs4_read_done_cb(task, hdr);
4389 }
4390
4391 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4392                                  struct rpc_message *msg)
4393 {
4394         hdr->timestamp   = jiffies;
4395         hdr->pgio_done_cb = nfs4_read_done_cb;
4396         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4397         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4398 }
4399
4400 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4401                                       struct nfs_pgio_header *hdr)
4402 {
4403         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4404                         &hdr->args.seq_args,
4405                         &hdr->res.seq_res,
4406                         task))
4407                 return 0;
4408         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4409                                 hdr->args.lock_context,
4410                                 hdr->rw_ops->rw_mode) == -EIO)
4411                 return -EIO;
4412         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4413                 return -EIO;
4414         return 0;
4415 }
4416
4417 static int nfs4_write_done_cb(struct rpc_task *task,
4418                               struct nfs_pgio_header *hdr)
4419 {
4420         struct inode *inode = hdr->inode;
4421
4422         trace_nfs4_write(hdr, task->tk_status);
4423         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4424                                     hdr->args.context->state,
4425                                     NULL) == -EAGAIN) {
4426                 rpc_restart_call_prepare(task);
4427                 return -EAGAIN;
4428         }
4429         if (task->tk_status >= 0) {
4430                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4431                 nfs_writeback_update_inode(hdr);
4432         }
4433         return 0;
4434 }
4435
4436 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4437                 struct nfs_pgio_args *args)
4438 {
4439
4440         if (!nfs4_error_stateid_expired(task->tk_status) ||
4441                 nfs4_stateid_is_current(&args->stateid,
4442                                 args->context,
4443                                 args->lock_context,
4444                                 FMODE_WRITE))
4445                 return false;
4446         rpc_restart_call_prepare(task);
4447         return true;
4448 }
4449
4450 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4451 {
4452         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4453                 return -EAGAIN;
4454         if (nfs4_write_stateid_changed(task, &hdr->args))
4455                 return -EAGAIN;
4456         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4457                 nfs4_write_done_cb(task, hdr);
4458 }
4459
4460 static
4461 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4462 {
4463         /* Don't request attributes for pNFS or O_DIRECT writes */
4464         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4465                 return false;
4466         /* Otherwise, request attributes if and only if we don't hold
4467          * a delegation
4468          */
4469         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4470 }
4471
4472 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4473                                   struct rpc_message *msg)
4474 {
4475         struct nfs_server *server = NFS_SERVER(hdr->inode);
4476
4477         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4478                 hdr->args.bitmask = NULL;
4479                 hdr->res.fattr = NULL;
4480         } else
4481                 hdr->args.bitmask = server->cache_consistency_bitmask;
4482
4483         if (!hdr->pgio_done_cb)
4484                 hdr->pgio_done_cb = nfs4_write_done_cb;
4485         hdr->res.server = server;
4486         hdr->timestamp   = jiffies;
4487
4488         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4489         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4490 }
4491
4492 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4493 {
4494         nfs4_setup_sequence(NFS_SERVER(data->inode),
4495                         &data->args.seq_args,
4496                         &data->res.seq_res,
4497                         task);
4498 }
4499
4500 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4501 {
4502         struct inode *inode = data->inode;
4503
4504         trace_nfs4_commit(data, task->tk_status);
4505         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4506                                     NULL, NULL) == -EAGAIN) {
4507                 rpc_restart_call_prepare(task);
4508                 return -EAGAIN;
4509         }
4510         return 0;
4511 }
4512
4513 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4514 {
4515         if (!nfs4_sequence_done(task, &data->res.seq_res))
4516                 return -EAGAIN;
4517         return data->commit_done_cb(task, data);
4518 }
4519
4520 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4521 {
4522         struct nfs_server *server = NFS_SERVER(data->inode);
4523
4524         if (data->commit_done_cb == NULL)
4525                 data->commit_done_cb = nfs4_commit_done_cb;
4526         data->res.server = server;
4527         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4528         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4529 }
4530
4531 struct nfs4_renewdata {
4532         struct nfs_client       *client;
4533         unsigned long           timestamp;
4534 };
4535
4536 /*
4537  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4538  * standalone procedure for queueing an asynchronous RENEW.
4539  */
4540 static void nfs4_renew_release(void *calldata)
4541 {
4542         struct nfs4_renewdata *data = calldata;
4543         struct nfs_client *clp = data->client;
4544
4545         if (atomic_read(&clp->cl_count) > 1)
4546                 nfs4_schedule_state_renewal(clp);
4547         nfs_put_client(clp);
4548         kfree(data);
4549 }
4550
4551 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4552 {
4553         struct nfs4_renewdata *data = calldata;
4554         struct nfs_client *clp = data->client;
4555         unsigned long timestamp = data->timestamp;
4556
4557         trace_nfs4_renew_async(clp, task->tk_status);
4558         switch (task->tk_status) {
4559         case 0:
4560                 break;
4561         case -NFS4ERR_LEASE_MOVED:
4562                 nfs4_schedule_lease_moved_recovery(clp);
4563                 break;
4564         default:
4565                 /* Unless we're shutting down, schedule state recovery! */
4566                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4567                         return;
4568                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4569                         nfs4_schedule_lease_recovery(clp);
4570                         return;
4571                 }
4572                 nfs4_schedule_path_down_recovery(clp);
4573         }
4574         do_renew_lease(clp, timestamp);
4575 }
4576
4577 static const struct rpc_call_ops nfs4_renew_ops = {
4578         .rpc_call_done = nfs4_renew_done,
4579         .rpc_release = nfs4_renew_release,
4580 };
4581
4582 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4583 {
4584         struct rpc_message msg = {
4585                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4586                 .rpc_argp       = clp,
4587                 .rpc_cred       = cred,
4588         };
4589         struct nfs4_renewdata *data;
4590
4591         if (renew_flags == 0)
4592                 return 0;
4593         if (!atomic_inc_not_zero(&clp->cl_count))
4594                 return -EIO;
4595         data = kmalloc(sizeof(*data), GFP_NOFS);
4596         if (data == NULL)
4597                 return -ENOMEM;
4598         data->client = clp;
4599         data->timestamp = jiffies;
4600         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4601                         &nfs4_renew_ops, data);
4602 }
4603
4604 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4605 {
4606         struct rpc_message msg = {
4607                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4608                 .rpc_argp       = clp,
4609                 .rpc_cred       = cred,
4610         };
4611         unsigned long now = jiffies;
4612         int status;
4613
4614         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4615         if (status < 0)
4616                 return status;
4617         do_renew_lease(clp, now);
4618         return 0;
4619 }
4620
4621 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4622 {
4623         return server->caps & NFS_CAP_ACLS;
4624 }
4625
4626 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4627  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4628  * the stack.
4629  */
4630 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4631
4632 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4633                 struct page **pages)
4634 {
4635         struct page *newpage, **spages;
4636         int rc = 0;
4637         size_t len;
4638         spages = pages;
4639
4640         do {
4641                 len = min_t(size_t, PAGE_SIZE, buflen);
4642                 newpage = alloc_page(GFP_KERNEL);
4643
4644                 if (newpage == NULL)
4645                         goto unwind;
4646                 memcpy(page_address(newpage), buf, len);
4647                 buf += len;
4648                 buflen -= len;
4649                 *pages++ = newpage;
4650                 rc++;
4651         } while (buflen != 0);
4652
4653         return rc;
4654
4655 unwind:
4656         for(; rc > 0; rc--)
4657                 __free_page(spages[rc-1]);
4658         return -ENOMEM;
4659 }
4660
4661 struct nfs4_cached_acl {
4662         int cached;
4663         size_t len;
4664         char data[0];
4665 };
4666
4667 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4668 {
4669         struct nfs_inode *nfsi = NFS_I(inode);
4670
4671         spin_lock(&inode->i_lock);
4672         kfree(nfsi->nfs4_acl);
4673         nfsi->nfs4_acl = acl;
4674         spin_unlock(&inode->i_lock);
4675 }
4676
4677 static void nfs4_zap_acl_attr(struct inode *inode)
4678 {
4679         nfs4_set_cached_acl(inode, NULL);
4680 }
4681
4682 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4683 {
4684         struct nfs_inode *nfsi = NFS_I(inode);
4685         struct nfs4_cached_acl *acl;
4686         int ret = -ENOENT;
4687
4688         spin_lock(&inode->i_lock);
4689         acl = nfsi->nfs4_acl;
4690         if (acl == NULL)
4691                 goto out;
4692         if (buf == NULL) /* user is just asking for length */
4693                 goto out_len;
4694         if (acl->cached == 0)
4695                 goto out;
4696         ret = -ERANGE; /* see getxattr(2) man page */
4697         if (acl->len > buflen)
4698                 goto out;
4699         memcpy(buf, acl->data, acl->len);
4700 out_len:
4701         ret = acl->len;
4702 out:
4703         spin_unlock(&inode->i_lock);
4704         return ret;
4705 }
4706
4707 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4708 {
4709         struct nfs4_cached_acl *acl;
4710         size_t buflen = sizeof(*acl) + acl_len;
4711
4712         if (buflen <= PAGE_SIZE) {
4713                 acl = kmalloc(buflen, GFP_KERNEL);
4714                 if (acl == NULL)
4715                         goto out;
4716                 acl->cached = 1;
4717                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4718         } else {
4719                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4720                 if (acl == NULL)
4721                         goto out;
4722                 acl->cached = 0;
4723         }
4724         acl->len = acl_len;
4725 out:
4726         nfs4_set_cached_acl(inode, acl);
4727 }
4728
4729 /*
4730  * The getxattr API returns the required buffer length when called with a
4731  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4732  * the required buf.  On a NULL buf, we send a page of data to the server
4733  * guessing that the ACL request can be serviced by a page. If so, we cache
4734  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4735  * the cache. If not so, we throw away the page, and cache the required
4736  * length. The next getxattr call will then produce another round trip to
4737  * the server, this time with the input buf of the required size.
4738  */
4739 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4740 {
4741         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4742         struct nfs_getaclargs args = {
4743                 .fh = NFS_FH(inode),
4744                 .acl_pages = pages,
4745                 .acl_len = buflen,
4746         };
4747         struct nfs_getaclres res = {
4748                 .acl_len = buflen,
4749         };
4750         struct rpc_message msg = {
4751                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4752                 .rpc_argp = &args,
4753                 .rpc_resp = &res,
4754         };
4755         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4756         int ret = -ENOMEM, i;
4757
4758         /* As long as we're doing a round trip to the server anyway,
4759          * let's be prepared for a page of acl data. */
4760         if (npages == 0)
4761                 npages = 1;
4762         if (npages > ARRAY_SIZE(pages))
4763                 return -ERANGE;
4764
4765         for (i = 0; i < npages; i++) {
4766                 pages[i] = alloc_page(GFP_KERNEL);
4767                 if (!pages[i])
4768                         goto out_free;
4769         }
4770
4771         /* for decoding across pages */
4772         res.acl_scratch = alloc_page(GFP_KERNEL);
4773         if (!res.acl_scratch)
4774                 goto out_free;
4775
4776         args.acl_len = npages * PAGE_SIZE;
4777
4778         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4779                 __func__, buf, buflen, npages, args.acl_len);
4780         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4781                              &msg, &args.seq_args, &res.seq_res, 0);
4782         if (ret)
4783                 goto out_free;
4784
4785         /* Handle the case where the passed-in buffer is too short */
4786         if (res.acl_flags & NFS4_ACL_TRUNC) {
4787                 /* Did the user only issue a request for the acl length? */
4788                 if (buf == NULL)
4789                         goto out_ok;
4790                 ret = -ERANGE;
4791                 goto out_free;
4792         }
4793         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4794         if (buf) {
4795                 if (res.acl_len > buflen) {
4796                         ret = -ERANGE;
4797                         goto out_free;
4798                 }
4799                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4800         }
4801 out_ok:
4802         ret = res.acl_len;
4803 out_free:
4804         for (i = 0; i < npages; i++)
4805                 if (pages[i])
4806                         __free_page(pages[i]);
4807         if (res.acl_scratch)
4808                 __free_page(res.acl_scratch);
4809         return ret;
4810 }
4811
4812 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4813 {
4814         struct nfs4_exception exception = { };
4815         ssize_t ret;
4816         do {
4817                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4818                 trace_nfs4_get_acl(inode, ret);
4819                 if (ret >= 0)
4820                         break;
4821                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4822         } while (exception.retry);
4823         return ret;
4824 }
4825
4826 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4827 {
4828         struct nfs_server *server = NFS_SERVER(inode);
4829         int ret;
4830
4831         if (!nfs4_server_supports_acls(server))
4832                 return -EOPNOTSUPP;
4833         ret = nfs_revalidate_inode(server, inode);
4834         if (ret < 0)
4835                 return ret;
4836         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4837                 nfs_zap_acl_cache(inode);
4838         ret = nfs4_read_cached_acl(inode, buf, buflen);
4839         if (ret != -ENOENT)
4840                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4841                  * but no cached acl data, just the acl length */
4842                 return ret;
4843         return nfs4_get_acl_uncached(inode, buf, buflen);
4844 }
4845
4846 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4847 {
4848         struct nfs_server *server = NFS_SERVER(inode);
4849         struct page *pages[NFS4ACL_MAXPAGES];
4850         struct nfs_setaclargs arg = {
4851                 .fh             = NFS_FH(inode),
4852                 .acl_pages      = pages,
4853                 .acl_len        = buflen,
4854         };
4855         struct nfs_setaclres res;
4856         struct rpc_message msg = {
4857                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4858                 .rpc_argp       = &arg,
4859                 .rpc_resp       = &res,
4860         };
4861         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4862         int ret, i;
4863
4864         if (!nfs4_server_supports_acls(server))
4865                 return -EOPNOTSUPP;
4866         if (npages > ARRAY_SIZE(pages))
4867                 return -ERANGE;
4868         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
4869         if (i < 0)
4870                 return i;
4871         nfs4_inode_return_delegation(inode);
4872         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4873
4874         /*
4875          * Free each page after tx, so the only ref left is
4876          * held by the network stack
4877          */
4878         for (; i > 0; i--)
4879                 put_page(pages[i-1]);
4880
4881         /*
4882          * Acl update can result in inode attribute update.
4883          * so mark the attribute cache invalid.
4884          */
4885         spin_lock(&inode->i_lock);
4886         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4887         spin_unlock(&inode->i_lock);
4888         nfs_access_zap_cache(inode);
4889         nfs_zap_acl_cache(inode);
4890         return ret;
4891 }
4892
4893 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4894 {
4895         struct nfs4_exception exception = { };
4896         int err;
4897         do {
4898                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4899                 trace_nfs4_set_acl(inode, err);
4900                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4901                                 &exception);
4902         } while (exception.retry);
4903         return err;
4904 }
4905
4906 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4907 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4908                                         size_t buflen)
4909 {
4910         struct nfs_server *server = NFS_SERVER(inode);
4911         struct nfs_fattr fattr;
4912         struct nfs4_label label = {0, 0, buflen, buf};
4913
4914         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4915         struct nfs4_getattr_arg arg = {
4916                 .fh             = NFS_FH(inode),
4917                 .bitmask        = bitmask,
4918         };
4919         struct nfs4_getattr_res res = {
4920                 .fattr          = &fattr,
4921                 .label          = &label,
4922                 .server         = server,
4923         };
4924         struct rpc_message msg = {
4925                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4926                 .rpc_argp       = &arg,
4927                 .rpc_resp       = &res,
4928         };
4929         int ret;
4930
4931         nfs_fattr_init(&fattr);
4932
4933         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4934         if (ret)
4935                 return ret;
4936         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4937                 return -ENOENT;
4938         if (buflen < label.len)
4939                 return -ERANGE;
4940         return 0;
4941 }
4942
4943 static int nfs4_get_security_label(struct inode *inode, void *buf,
4944                                         size_t buflen)
4945 {
4946         struct nfs4_exception exception = { };
4947         int err;
4948
4949         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4950                 return -EOPNOTSUPP;
4951
4952         do {
4953                 err = _nfs4_get_security_label(inode, buf, buflen);
4954                 trace_nfs4_get_security_label(inode, err);
4955                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4956                                 &exception);
4957         } while (exception.retry);
4958         return err;
4959 }
4960
4961 static int _nfs4_do_set_security_label(struct inode *inode,
4962                 struct nfs4_label *ilabel,
4963                 struct nfs_fattr *fattr,
4964                 struct nfs4_label *olabel)
4965 {
4966
4967         struct iattr sattr = {0};
4968         struct nfs_server *server = NFS_SERVER(inode);
4969         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4970         struct nfs_setattrargs arg = {
4971                 .fh             = NFS_FH(inode),
4972                 .iap            = &sattr,
4973                 .server         = server,
4974                 .bitmask        = bitmask,
4975                 .label          = ilabel,
4976         };
4977         struct nfs_setattrres res = {
4978                 .fattr          = fattr,
4979                 .label          = olabel,
4980                 .server         = server,
4981         };
4982         struct rpc_message msg = {
4983                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4984                 .rpc_argp       = &arg,
4985                 .rpc_resp       = &res,
4986         };
4987         int status;
4988
4989         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4990
4991         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4992         if (status)
4993                 dprintk("%s failed: %d\n", __func__, status);
4994
4995         return status;
4996 }
4997
4998 static int nfs4_do_set_security_label(struct inode *inode,
4999                 struct nfs4_label *ilabel,
5000                 struct nfs_fattr *fattr,
5001                 struct nfs4_label *olabel)
5002 {
5003         struct nfs4_exception exception = { };
5004         int err;
5005
5006         do {
5007                 err = _nfs4_do_set_security_label(inode, ilabel,
5008                                 fattr, olabel);
5009                 trace_nfs4_set_security_label(inode, err);
5010                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5011                                 &exception);
5012         } while (exception.retry);
5013         return err;
5014 }
5015
5016 static int
5017 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
5018 {
5019         struct nfs4_label ilabel, *olabel = NULL;
5020         struct nfs_fattr fattr;
5021         struct rpc_cred *cred;
5022         int status;
5023
5024         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5025                 return -EOPNOTSUPP;
5026
5027         nfs_fattr_init(&fattr);
5028
5029         ilabel.pi = 0;
5030         ilabel.lfs = 0;
5031         ilabel.label = (char *)buf;
5032         ilabel.len = buflen;
5033
5034         cred = rpc_lookup_cred();
5035         if (IS_ERR(cred))
5036                 return PTR_ERR(cred);
5037
5038         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5039         if (IS_ERR(olabel)) {
5040                 status = -PTR_ERR(olabel);
5041                 goto out;
5042         }
5043
5044         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5045         if (status == 0)
5046                 nfs_setsecurity(inode, &fattr, olabel);
5047
5048         nfs4_label_free(olabel);
5049 out:
5050         put_rpccred(cred);
5051         return status;
5052 }
5053 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
5054
5055
5056 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5057                                     nfs4_verifier *bootverf)
5058 {
5059         __be32 verf[2];
5060
5061         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5062                 /* An impossible timestamp guarantees this value
5063                  * will never match a generated boot time. */
5064                 verf[0] = 0;
5065                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
5066         } else {
5067                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5068                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
5069                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
5070         }
5071         memcpy(bootverf->data, verf, sizeof(bootverf->data));
5072 }
5073
5074 static int
5075 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
5076 {
5077         size_t len;
5078         char *str;
5079
5080         if (clp->cl_owner_id != NULL)
5081                 return 0;
5082
5083         rcu_read_lock();
5084         len = 14 + strlen(clp->cl_ipaddr) + 1 +
5085                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5086                 1 +
5087                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) +
5088                 1;
5089         rcu_read_unlock();
5090
5091         if (len > NFS4_OPAQUE_LIMIT + 1)
5092                 return -EINVAL;
5093
5094         /*
5095          * Since this string is allocated at mount time, and held until the
5096          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5097          * about a memory-reclaim deadlock.
5098          */
5099         str = kmalloc(len, GFP_KERNEL);
5100         if (!str)
5101                 return -ENOMEM;
5102
5103         rcu_read_lock();
5104         scnprintf(str, len, "Linux NFSv4.0 %s/%s %s",
5105                         clp->cl_ipaddr,
5106                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
5107                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO));
5108         rcu_read_unlock();
5109
5110         clp->cl_owner_id = str;
5111         return 0;
5112 }
5113
5114 static int
5115 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
5116 {
5117         size_t len;
5118         char *str;
5119
5120         len = 10 + 10 + 1 + 10 + 1 +
5121                 strlen(nfs4_client_id_uniquifier) + 1 +
5122                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5123
5124         if (len > NFS4_OPAQUE_LIMIT + 1)
5125                 return -EINVAL;
5126
5127         /*
5128          * Since this string is allocated at mount time, and held until the
5129          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5130          * about a memory-reclaim deadlock.
5131          */
5132         str = kmalloc(len, GFP_KERNEL);
5133         if (!str)
5134                 return -ENOMEM;
5135
5136         scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
5137                         clp->rpc_ops->version, clp->cl_minorversion,
5138                         nfs4_client_id_uniquifier,
5139                         clp->cl_rpcclient->cl_nodename);
5140         clp->cl_owner_id = str;
5141         return 0;
5142 }
5143
5144 static int
5145 nfs4_init_uniform_client_string(struct nfs_client *clp)
5146 {
5147         size_t len;
5148         char *str;
5149
5150         if (clp->cl_owner_id != NULL)
5151                 return 0;
5152
5153         if (nfs4_client_id_uniquifier[0] != '\0')
5154                 return nfs4_init_uniquifier_client_string(clp);
5155
5156         len = 10 + 10 + 1 + 10 + 1 +
5157                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5158
5159         if (len > NFS4_OPAQUE_LIMIT + 1)
5160                 return -EINVAL;
5161
5162         /*
5163          * Since this string is allocated at mount time, and held until the
5164          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5165          * about a memory-reclaim deadlock.
5166          */
5167         str = kmalloc(len, GFP_KERNEL);
5168         if (!str)
5169                 return -ENOMEM;
5170
5171         scnprintf(str, len, "Linux NFSv%u.%u %s",
5172                         clp->rpc_ops->version, clp->cl_minorversion,
5173                         clp->cl_rpcclient->cl_nodename);
5174         clp->cl_owner_id = str;
5175         return 0;
5176 }
5177
5178 /*
5179  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5180  * services.  Advertise one based on the address family of the
5181  * clientaddr.
5182  */
5183 static unsigned int
5184 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5185 {
5186         if (strchr(clp->cl_ipaddr, ':') != NULL)
5187                 return scnprintf(buf, len, "tcp6");
5188         else
5189                 return scnprintf(buf, len, "tcp");
5190 }
5191
5192 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5193 {
5194         struct nfs4_setclientid *sc = calldata;
5195
5196         if (task->tk_status == 0)
5197                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5198 }
5199
5200 static const struct rpc_call_ops nfs4_setclientid_ops = {
5201         .rpc_call_done = nfs4_setclientid_done,
5202 };
5203
5204 /**
5205  * nfs4_proc_setclientid - Negotiate client ID
5206  * @clp: state data structure
5207  * @program: RPC program for NFSv4 callback service
5208  * @port: IP port number for NFS4 callback service
5209  * @cred: RPC credential to use for this call
5210  * @res: where to place the result
5211  *
5212  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5213  */
5214 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5215                 unsigned short port, struct rpc_cred *cred,
5216                 struct nfs4_setclientid_res *res)
5217 {
5218         nfs4_verifier sc_verifier;
5219         struct nfs4_setclientid setclientid = {
5220                 .sc_verifier = &sc_verifier,
5221                 .sc_prog = program,
5222                 .sc_clnt = clp,
5223         };
5224         struct rpc_message msg = {
5225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5226                 .rpc_argp = &setclientid,
5227                 .rpc_resp = res,
5228                 .rpc_cred = cred,
5229         };
5230         struct rpc_task *task;
5231         struct rpc_task_setup task_setup_data = {
5232                 .rpc_client = clp->cl_rpcclient,
5233                 .rpc_message = &msg,
5234                 .callback_ops = &nfs4_setclientid_ops,
5235                 .callback_data = &setclientid,
5236                 .flags = RPC_TASK_TIMEOUT,
5237         };
5238         int status;
5239
5240         /* nfs_client_id4 */
5241         nfs4_init_boot_verifier(clp, &sc_verifier);
5242
5243         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5244                 status = nfs4_init_uniform_client_string(clp);
5245         else
5246                 status = nfs4_init_nonuniform_client_string(clp);
5247
5248         if (status)
5249                 goto out;
5250
5251         /* cb_client4 */
5252         setclientid.sc_netid_len =
5253                                 nfs4_init_callback_netid(clp,
5254                                                 setclientid.sc_netid,
5255                                                 sizeof(setclientid.sc_netid));
5256         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5257                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5258                                 clp->cl_ipaddr, port >> 8, port & 255);
5259
5260         dprintk("NFS call  setclientid auth=%s, '%s'\n",
5261                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5262                 clp->cl_owner_id);
5263         task = rpc_run_task(&task_setup_data);
5264         if (IS_ERR(task)) {
5265                 status = PTR_ERR(task);
5266                 goto out;
5267         }
5268         status = task->tk_status;
5269         if (setclientid.sc_cred) {
5270                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5271                 put_rpccred(setclientid.sc_cred);
5272         }
5273         rpc_put_task(task);
5274 out:
5275         trace_nfs4_setclientid(clp, status);
5276         dprintk("NFS reply setclientid: %d\n", status);
5277         return status;
5278 }
5279
5280 /**
5281  * nfs4_proc_setclientid_confirm - Confirm client ID
5282  * @clp: state data structure
5283  * @res: result of a previous SETCLIENTID
5284  * @cred: RPC credential to use for this call
5285  *
5286  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5287  */
5288 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5289                 struct nfs4_setclientid_res *arg,
5290                 struct rpc_cred *cred)
5291 {
5292         struct rpc_message msg = {
5293                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5294                 .rpc_argp = arg,
5295                 .rpc_cred = cred,
5296         };
5297         int status;
5298
5299         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5300                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5301                 clp->cl_clientid);
5302         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5303         trace_nfs4_setclientid_confirm(clp, status);
5304         dprintk("NFS reply setclientid_confirm: %d\n", status);
5305         return status;
5306 }
5307
5308 struct nfs4_delegreturndata {
5309         struct nfs4_delegreturnargs args;
5310         struct nfs4_delegreturnres res;
5311         struct nfs_fh fh;
5312         nfs4_stateid stateid;
5313         unsigned long timestamp;
5314         struct nfs_fattr fattr;
5315         int rpc_status;
5316         struct inode *inode;
5317         bool roc;
5318         u32 roc_barrier;
5319 };
5320
5321 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5322 {
5323         struct nfs4_delegreturndata *data = calldata;
5324
5325         if (!nfs4_sequence_done(task, &data->res.seq_res))
5326                 return;
5327
5328         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5329         switch (task->tk_status) {
5330         case 0:
5331                 renew_lease(data->res.server, data->timestamp);
5332         case -NFS4ERR_ADMIN_REVOKED:
5333         case -NFS4ERR_DELEG_REVOKED:
5334         case -NFS4ERR_BAD_STATEID:
5335         case -NFS4ERR_OLD_STATEID:
5336         case -NFS4ERR_STALE_STATEID:
5337         case -NFS4ERR_EXPIRED:
5338                 task->tk_status = 0;
5339                 if (data->roc)
5340                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5341                 break;
5342         default:
5343                 if (nfs4_async_handle_error(task, data->res.server,
5344                                             NULL, NULL) == -EAGAIN) {
5345                         rpc_restart_call_prepare(task);
5346                         return;
5347                 }
5348         }
5349         data->rpc_status = task->tk_status;
5350 }
5351
5352 static void nfs4_delegreturn_release(void *calldata)
5353 {
5354         struct nfs4_delegreturndata *data = calldata;
5355         struct inode *inode = data->inode;
5356
5357         if (inode) {
5358                 if (data->roc)
5359                         pnfs_roc_release(inode);
5360                 nfs_iput_and_deactive(inode);
5361         }
5362         kfree(calldata);
5363 }
5364
5365 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5366 {
5367         struct nfs4_delegreturndata *d_data;
5368
5369         d_data = (struct nfs4_delegreturndata *)data;
5370
5371         if (nfs4_wait_on_layoutreturn(d_data->inode, task))
5372                 return;
5373
5374         if (d_data->roc)
5375                 pnfs_roc_get_barrier(d_data->inode, &d_data->roc_barrier);
5376
5377         nfs4_setup_sequence(d_data->res.server,
5378                         &d_data->args.seq_args,
5379                         &d_data->res.seq_res,
5380                         task);
5381 }
5382
5383 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5384         .rpc_call_prepare = nfs4_delegreturn_prepare,
5385         .rpc_call_done = nfs4_delegreturn_done,
5386         .rpc_release = nfs4_delegreturn_release,
5387 };
5388
5389 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5390 {
5391         struct nfs4_delegreturndata *data;
5392         struct nfs_server *server = NFS_SERVER(inode);
5393         struct rpc_task *task;
5394         struct rpc_message msg = {
5395                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5396                 .rpc_cred = cred,
5397         };
5398         struct rpc_task_setup task_setup_data = {
5399                 .rpc_client = server->client,
5400                 .rpc_message = &msg,
5401                 .callback_ops = &nfs4_delegreturn_ops,
5402                 .flags = RPC_TASK_ASYNC,
5403         };
5404         int status = 0;
5405
5406         data = kzalloc(sizeof(*data), GFP_NOFS);
5407         if (data == NULL)
5408                 return -ENOMEM;
5409         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5410
5411         nfs4_state_protect(server->nfs_client,
5412                         NFS_SP4_MACH_CRED_CLEANUP,
5413                         &task_setup_data.rpc_client, &msg);
5414
5415         data->args.fhandle = &data->fh;
5416         data->args.stateid = &data->stateid;
5417         data->args.bitmask = server->cache_consistency_bitmask;
5418         nfs_copy_fh(&data->fh, NFS_FH(inode));
5419         nfs4_stateid_copy(&data->stateid, stateid);
5420         data->res.fattr = &data->fattr;
5421         data->res.server = server;
5422         nfs_fattr_init(data->res.fattr);
5423         data->timestamp = jiffies;
5424         data->rpc_status = 0;
5425         data->inode = nfs_igrab_and_active(inode);
5426         if (data->inode)
5427                 data->roc = nfs4_roc(inode);
5428
5429         task_setup_data.callback_data = data;
5430         msg.rpc_argp = &data->args;
5431         msg.rpc_resp = &data->res;
5432         task = rpc_run_task(&task_setup_data);
5433         if (IS_ERR(task))
5434                 return PTR_ERR(task);
5435         if (!issync)
5436                 goto out;
5437         status = nfs4_wait_for_completion_rpc_task(task);
5438         if (status != 0)
5439                 goto out;
5440         status = data->rpc_status;
5441         if (status == 0)
5442                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5443         else
5444                 nfs_refresh_inode(inode, &data->fattr);
5445 out:
5446         rpc_put_task(task);
5447         return status;
5448 }
5449
5450 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5451 {
5452         struct nfs_server *server = NFS_SERVER(inode);
5453         struct nfs4_exception exception = { };
5454         int err;
5455         do {
5456                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5457                 trace_nfs4_delegreturn(inode, stateid, err);
5458                 switch (err) {
5459                         case -NFS4ERR_STALE_STATEID:
5460                         case -NFS4ERR_EXPIRED:
5461                         case 0:
5462                                 return 0;
5463                 }
5464                 err = nfs4_handle_exception(server, err, &exception);
5465         } while (exception.retry);
5466         return err;
5467 }
5468
5469 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5470 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5471
5472 /*
5473  * sleep, with exponential backoff, and retry the LOCK operation.
5474  */
5475 static unsigned long
5476 nfs4_set_lock_task_retry(unsigned long timeout)
5477 {
5478         freezable_schedule_timeout_killable_unsafe(timeout);
5479         timeout <<= 1;
5480         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5481                 return NFS4_LOCK_MAXTIMEOUT;
5482         return timeout;
5483 }
5484
5485 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5486 {
5487         struct inode *inode = state->inode;
5488         struct nfs_server *server = NFS_SERVER(inode);
5489         struct nfs_client *clp = server->nfs_client;
5490         struct nfs_lockt_args arg = {
5491                 .fh = NFS_FH(inode),
5492                 .fl = request,
5493         };
5494         struct nfs_lockt_res res = {
5495                 .denied = request,
5496         };
5497         struct rpc_message msg = {
5498                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5499                 .rpc_argp       = &arg,
5500                 .rpc_resp       = &res,
5501                 .rpc_cred       = state->owner->so_cred,
5502         };
5503         struct nfs4_lock_state *lsp;
5504         int status;
5505
5506         arg.lock_owner.clientid = clp->cl_clientid;
5507         status = nfs4_set_lock_state(state, request);
5508         if (status != 0)
5509                 goto out;
5510         lsp = request->fl_u.nfs4_fl.owner;
5511         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5512         arg.lock_owner.s_dev = server->s_dev;
5513         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5514         switch (status) {
5515                 case 0:
5516                         request->fl_type = F_UNLCK;
5517                         break;
5518                 case -NFS4ERR_DENIED:
5519                         status = 0;
5520         }
5521         request->fl_ops->fl_release_private(request);
5522         request->fl_ops = NULL;
5523 out:
5524         return status;
5525 }
5526
5527 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5528 {
5529         struct nfs4_exception exception = { };
5530         int err;
5531
5532         do {
5533                 err = _nfs4_proc_getlk(state, cmd, request);
5534                 trace_nfs4_get_lock(request, state, cmd, err);
5535                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5536                                 &exception);
5537         } while (exception.retry);
5538         return err;
5539 }
5540
5541 static int do_vfs_lock(struct inode *inode, struct file_lock *fl)
5542 {
5543         return locks_lock_inode_wait(inode, fl);
5544 }
5545
5546 struct nfs4_unlockdata {
5547         struct nfs_locku_args arg;
5548         struct nfs_locku_res res;
5549         struct nfs4_lock_state *lsp;
5550         struct nfs_open_context *ctx;
5551         struct file_lock fl;
5552         struct nfs_server *server;
5553         unsigned long timestamp;
5554 };
5555
5556 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5557                 struct nfs_open_context *ctx,
5558                 struct nfs4_lock_state *lsp,
5559                 struct nfs_seqid *seqid)
5560 {
5561         struct nfs4_unlockdata *p;
5562         struct inode *inode = lsp->ls_state->inode;
5563
5564         p = kzalloc(sizeof(*p), GFP_NOFS);
5565         if (p == NULL)
5566                 return NULL;
5567         p->arg.fh = NFS_FH(inode);
5568         p->arg.fl = &p->fl;
5569         p->arg.seqid = seqid;
5570         p->res.seqid = seqid;
5571         p->lsp = lsp;
5572         atomic_inc(&lsp->ls_count);
5573         /* Ensure we don't close file until we're done freeing locks! */
5574         p->ctx = get_nfs_open_context(ctx);
5575         memcpy(&p->fl, fl, sizeof(p->fl));
5576         p->server = NFS_SERVER(inode);
5577         return p;
5578 }
5579
5580 static void nfs4_locku_release_calldata(void *data)
5581 {
5582         struct nfs4_unlockdata *calldata = data;
5583         nfs_free_seqid(calldata->arg.seqid);
5584         nfs4_put_lock_state(calldata->lsp);
5585         put_nfs_open_context(calldata->ctx);
5586         kfree(calldata);
5587 }
5588
5589 static void nfs4_locku_done(struct rpc_task *task, void *data)
5590 {
5591         struct nfs4_unlockdata *calldata = data;
5592
5593         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5594                 return;
5595         switch (task->tk_status) {
5596                 case 0:
5597                         renew_lease(calldata->server, calldata->timestamp);
5598                         do_vfs_lock(calldata->lsp->ls_state->inode, &calldata->fl);
5599                         if (nfs4_update_lock_stateid(calldata->lsp,
5600                                         &calldata->res.stateid))
5601                                 break;
5602                 case -NFS4ERR_BAD_STATEID:
5603                 case -NFS4ERR_OLD_STATEID:
5604                 case -NFS4ERR_STALE_STATEID:
5605                 case -NFS4ERR_EXPIRED:
5606                         if (!nfs4_stateid_match(&calldata->arg.stateid,
5607                                                 &calldata->lsp->ls_stateid))
5608                                 rpc_restart_call_prepare(task);
5609                         break;
5610                 default:
5611                         if (nfs4_async_handle_error(task, calldata->server,
5612                                                     NULL, NULL) == -EAGAIN)
5613                                 rpc_restart_call_prepare(task);
5614         }
5615         nfs_release_seqid(calldata->arg.seqid);
5616 }
5617
5618 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5619 {
5620         struct nfs4_unlockdata *calldata = data;
5621
5622         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5623                 goto out_wait;
5624         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5625         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5626                 /* Note: exit _without_ running nfs4_locku_done */
5627                 goto out_no_action;
5628         }
5629         calldata->timestamp = jiffies;
5630         if (nfs4_setup_sequence(calldata->server,
5631                                 &calldata->arg.seq_args,
5632                                 &calldata->res.seq_res,
5633                                 task) != 0)
5634                 nfs_release_seqid(calldata->arg.seqid);
5635         return;
5636 out_no_action:
5637         task->tk_action = NULL;
5638 out_wait:
5639         nfs4_sequence_done(task, &calldata->res.seq_res);
5640 }
5641
5642 static const struct rpc_call_ops nfs4_locku_ops = {
5643         .rpc_call_prepare = nfs4_locku_prepare,
5644         .rpc_call_done = nfs4_locku_done,
5645         .rpc_release = nfs4_locku_release_calldata,
5646 };
5647
5648 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5649                 struct nfs_open_context *ctx,
5650                 struct nfs4_lock_state *lsp,
5651                 struct nfs_seqid *seqid)
5652 {
5653         struct nfs4_unlockdata *data;
5654         struct rpc_message msg = {
5655                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5656                 .rpc_cred = ctx->cred,
5657         };
5658         struct rpc_task_setup task_setup_data = {
5659                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5660                 .rpc_message = &msg,
5661                 .callback_ops = &nfs4_locku_ops,
5662                 .workqueue = nfsiod_workqueue,
5663                 .flags = RPC_TASK_ASYNC,
5664         };
5665
5666         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5667                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5668
5669         /* Ensure this is an unlock - when canceling a lock, the
5670          * canceled lock is passed in, and it won't be an unlock.
5671          */
5672         fl->fl_type = F_UNLCK;
5673
5674         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5675         if (data == NULL) {
5676                 nfs_free_seqid(seqid);
5677                 return ERR_PTR(-ENOMEM);
5678         }
5679
5680         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5681         msg.rpc_argp = &data->arg;
5682         msg.rpc_resp = &data->res;
5683         task_setup_data.callback_data = data;
5684         return rpc_run_task(&task_setup_data);
5685 }
5686
5687 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5688 {
5689         struct inode *inode = state->inode;
5690         struct nfs4_state_owner *sp = state->owner;
5691         struct nfs_inode *nfsi = NFS_I(inode);
5692         struct nfs_seqid *seqid;
5693         struct nfs4_lock_state *lsp;
5694         struct rpc_task *task;
5695         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5696         int status = 0;
5697         unsigned char fl_flags = request->fl_flags;
5698
5699         status = nfs4_set_lock_state(state, request);
5700         /* Unlock _before_ we do the RPC call */
5701         request->fl_flags |= FL_EXISTS;
5702         /* Exclude nfs_delegation_claim_locks() */
5703         mutex_lock(&sp->so_delegreturn_mutex);
5704         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5705         down_read(&nfsi->rwsem);
5706         if (do_vfs_lock(inode, request) == -ENOENT) {
5707                 up_read(&nfsi->rwsem);
5708                 mutex_unlock(&sp->so_delegreturn_mutex);
5709                 goto out;
5710         }
5711         up_read(&nfsi->rwsem);
5712         mutex_unlock(&sp->so_delegreturn_mutex);
5713         if (status != 0)
5714                 goto out;
5715         /* Is this a delegated lock? */
5716         lsp = request->fl_u.nfs4_fl.owner;
5717         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5718                 goto out;
5719         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5720         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5721         status = -ENOMEM;
5722         if (IS_ERR(seqid))
5723                 goto out;
5724         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5725         status = PTR_ERR(task);
5726         if (IS_ERR(task))
5727                 goto out;
5728         status = nfs4_wait_for_completion_rpc_task(task);
5729         rpc_put_task(task);
5730 out:
5731         request->fl_flags = fl_flags;
5732         trace_nfs4_unlock(request, state, F_SETLK, status);
5733         return status;
5734 }
5735
5736 struct nfs4_lockdata {
5737         struct nfs_lock_args arg;
5738         struct nfs_lock_res res;
5739         struct nfs4_lock_state *lsp;
5740         struct nfs_open_context *ctx;
5741         struct file_lock fl;
5742         unsigned long timestamp;
5743         int rpc_status;
5744         int cancelled;
5745         struct nfs_server *server;
5746 };
5747
5748 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5749                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5750                 gfp_t gfp_mask)
5751 {
5752         struct nfs4_lockdata *p;
5753         struct inode *inode = lsp->ls_state->inode;
5754         struct nfs_server *server = NFS_SERVER(inode);
5755         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5756
5757         p = kzalloc(sizeof(*p), gfp_mask);
5758         if (p == NULL)
5759                 return NULL;
5760
5761         p->arg.fh = NFS_FH(inode);
5762         p->arg.fl = &p->fl;
5763         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5764         if (IS_ERR(p->arg.open_seqid))
5765                 goto out_free;
5766         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
5767         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5768         if (IS_ERR(p->arg.lock_seqid))
5769                 goto out_free_seqid;
5770         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5771         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5772         p->arg.lock_owner.s_dev = server->s_dev;
5773         p->res.lock_seqid = p->arg.lock_seqid;
5774         p->lsp = lsp;
5775         p->server = server;
5776         atomic_inc(&lsp->ls_count);
5777         p->ctx = get_nfs_open_context(ctx);
5778         get_file(fl->fl_file);
5779         memcpy(&p->fl, fl, sizeof(p->fl));
5780         return p;
5781 out_free_seqid:
5782         nfs_free_seqid(p->arg.open_seqid);
5783 out_free:
5784         kfree(p);
5785         return NULL;
5786 }
5787
5788 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5789 {
5790         struct nfs4_lockdata *data = calldata;
5791         struct nfs4_state *state = data->lsp->ls_state;
5792
5793         dprintk("%s: begin!\n", __func__);
5794         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5795                 goto out_wait;
5796         /* Do we need to do an open_to_lock_owner? */
5797         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5798                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5799                         goto out_release_lock_seqid;
5800                 }
5801                 nfs4_stateid_copy(&data->arg.open_stateid,
5802                                 &state->open_stateid);
5803                 data->arg.new_lock_owner = 1;
5804                 data->res.open_seqid = data->arg.open_seqid;
5805         } else {
5806                 data->arg.new_lock_owner = 0;
5807                 nfs4_stateid_copy(&data->arg.lock_stateid,
5808                                 &data->lsp->ls_stateid);
5809         }
5810         if (!nfs4_valid_open_stateid(state)) {
5811                 data->rpc_status = -EBADF;
5812                 task->tk_action = NULL;
5813                 goto out_release_open_seqid;
5814         }
5815         data->timestamp = jiffies;
5816         if (nfs4_setup_sequence(data->server,
5817                                 &data->arg.seq_args,
5818                                 &data->res.seq_res,
5819                                 task) == 0)
5820                 return;
5821 out_release_open_seqid:
5822         nfs_release_seqid(data->arg.open_seqid);
5823 out_release_lock_seqid:
5824         nfs_release_seqid(data->arg.lock_seqid);
5825 out_wait:
5826         nfs4_sequence_done(task, &data->res.seq_res);
5827         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5828 }
5829
5830 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5831 {
5832         struct nfs4_lockdata *data = calldata;
5833         struct nfs4_lock_state *lsp = data->lsp;
5834
5835         dprintk("%s: begin!\n", __func__);
5836
5837         if (!nfs4_sequence_done(task, &data->res.seq_res))
5838                 return;
5839
5840         data->rpc_status = task->tk_status;
5841         switch (task->tk_status) {
5842         case 0:
5843                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
5844                                 data->timestamp);
5845                 if (data->arg.new_lock) {
5846                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5847                         if (do_vfs_lock(lsp->ls_state->inode, &data->fl) < 0) {
5848                                 rpc_restart_call_prepare(task);
5849                                 break;
5850                         }
5851                 }
5852                 if (data->arg.new_lock_owner != 0) {
5853                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
5854                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5855                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5856                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5857                         rpc_restart_call_prepare(task);
5858                 break;
5859         case -NFS4ERR_BAD_STATEID:
5860         case -NFS4ERR_OLD_STATEID:
5861         case -NFS4ERR_STALE_STATEID:
5862         case -NFS4ERR_EXPIRED:
5863                 if (data->arg.new_lock_owner != 0) {
5864                         if (!nfs4_stateid_match(&data->arg.open_stateid,
5865                                                 &lsp->ls_state->open_stateid))
5866                                 rpc_restart_call_prepare(task);
5867                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5868                                                 &lsp->ls_stateid))
5869                                 rpc_restart_call_prepare(task);
5870         }
5871         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5872 }
5873
5874 static void nfs4_lock_release(void *calldata)
5875 {
5876         struct nfs4_lockdata *data = calldata;
5877
5878         dprintk("%s: begin!\n", __func__);
5879         nfs_free_seqid(data->arg.open_seqid);
5880         if (data->cancelled != 0) {
5881                 struct rpc_task *task;
5882                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5883                                 data->arg.lock_seqid);
5884                 if (!IS_ERR(task))
5885                         rpc_put_task_async(task);
5886                 dprintk("%s: cancelling lock!\n", __func__);
5887         } else
5888                 nfs_free_seqid(data->arg.lock_seqid);
5889         nfs4_put_lock_state(data->lsp);
5890         put_nfs_open_context(data->ctx);
5891         fput(data->fl.fl_file);
5892         kfree(data);
5893         dprintk("%s: done!\n", __func__);
5894 }
5895
5896 static const struct rpc_call_ops nfs4_lock_ops = {
5897         .rpc_call_prepare = nfs4_lock_prepare,
5898         .rpc_call_done = nfs4_lock_done,
5899         .rpc_release = nfs4_lock_release,
5900 };
5901
5902 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5903 {
5904         switch (error) {
5905         case -NFS4ERR_ADMIN_REVOKED:
5906         case -NFS4ERR_BAD_STATEID:
5907                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5908                 if (new_lock_owner != 0 ||
5909                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5910                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5911                 break;
5912         case -NFS4ERR_STALE_STATEID:
5913                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5914         case -NFS4ERR_EXPIRED:
5915                 nfs4_schedule_lease_recovery(server->nfs_client);
5916         };
5917 }
5918
5919 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5920 {
5921         struct nfs4_lockdata *data;
5922         struct rpc_task *task;
5923         struct rpc_message msg = {
5924                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5925                 .rpc_cred = state->owner->so_cred,
5926         };
5927         struct rpc_task_setup task_setup_data = {
5928                 .rpc_client = NFS_CLIENT(state->inode),
5929                 .rpc_message = &msg,
5930                 .callback_ops = &nfs4_lock_ops,
5931                 .workqueue = nfsiod_workqueue,
5932                 .flags = RPC_TASK_ASYNC,
5933         };
5934         int ret;
5935
5936         dprintk("%s: begin!\n", __func__);
5937         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5938                         fl->fl_u.nfs4_fl.owner,
5939                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5940         if (data == NULL)
5941                 return -ENOMEM;
5942         if (IS_SETLKW(cmd))
5943                 data->arg.block = 1;
5944         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5945         msg.rpc_argp = &data->arg;
5946         msg.rpc_resp = &data->res;
5947         task_setup_data.callback_data = data;
5948         if (recovery_type > NFS_LOCK_NEW) {
5949                 if (recovery_type == NFS_LOCK_RECLAIM)
5950                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5951                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5952         } else
5953                 data->arg.new_lock = 1;
5954         task = rpc_run_task(&task_setup_data);
5955         if (IS_ERR(task))
5956                 return PTR_ERR(task);
5957         ret = nfs4_wait_for_completion_rpc_task(task);
5958         if (ret == 0) {
5959                 ret = data->rpc_status;
5960                 if (ret)
5961                         nfs4_handle_setlk_error(data->server, data->lsp,
5962                                         data->arg.new_lock_owner, ret);
5963         } else
5964                 data->cancelled = 1;
5965         rpc_put_task(task);
5966         dprintk("%s: done, ret = %d!\n", __func__, ret);
5967         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
5968         return ret;
5969 }
5970
5971 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5972 {
5973         struct nfs_server *server = NFS_SERVER(state->inode);
5974         struct nfs4_exception exception = {
5975                 .inode = state->inode,
5976         };
5977         int err;
5978
5979         do {
5980                 /* Cache the lock if possible... */
5981                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5982                         return 0;
5983                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5984                 if (err != -NFS4ERR_DELAY)
5985                         break;
5986                 nfs4_handle_exception(server, err, &exception);
5987         } while (exception.retry);
5988         return err;
5989 }
5990
5991 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5992 {
5993         struct nfs_server *server = NFS_SERVER(state->inode);
5994         struct nfs4_exception exception = {
5995                 .inode = state->inode,
5996         };
5997         int err;
5998
5999         err = nfs4_set_lock_state(state, request);
6000         if (err != 0)
6001                 return err;
6002         if (!recover_lost_locks) {
6003                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
6004                 return 0;
6005         }
6006         do {
6007                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6008                         return 0;
6009                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
6010                 switch (err) {
6011                 default:
6012                         goto out;
6013                 case -NFS4ERR_GRACE:
6014                 case -NFS4ERR_DELAY:
6015                         nfs4_handle_exception(server, err, &exception);
6016                         err = 0;
6017                 }
6018         } while (exception.retry);
6019 out:
6020         return err;
6021 }
6022
6023 #if defined(CONFIG_NFS_V4_1)
6024 /**
6025  * nfs41_check_expired_locks - possibly free a lock stateid
6026  *
6027  * @state: NFSv4 state for an inode
6028  *
6029  * Returns NFS_OK if recovery for this stateid is now finished.
6030  * Otherwise a negative NFS4ERR value is returned.
6031  */
6032 static int nfs41_check_expired_locks(struct nfs4_state *state)
6033 {
6034         int status, ret = -NFS4ERR_BAD_STATEID;
6035         struct nfs4_lock_state *lsp;
6036         struct nfs_server *server = NFS_SERVER(state->inode);
6037
6038         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
6039                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
6040                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
6041
6042                         status = nfs41_test_stateid(server,
6043                                         &lsp->ls_stateid,
6044                                         cred);
6045                         trace_nfs4_test_lock_stateid(state, lsp, status);
6046                         if (status != NFS_OK) {
6047                                 /* Free the stateid unless the server
6048                                  * informs us the stateid is unrecognized. */
6049                                 if (status != -NFS4ERR_BAD_STATEID)
6050                                         nfs41_free_stateid(server,
6051                                                         &lsp->ls_stateid,
6052                                                         cred);
6053                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6054                                 ret = status;
6055                         }
6056                 }
6057         };
6058
6059         return ret;
6060 }
6061
6062 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
6063 {
6064         int status = NFS_OK;
6065
6066         if (test_bit(LK_STATE_IN_USE, &state->flags))
6067                 status = nfs41_check_expired_locks(state);
6068         if (status != NFS_OK)
6069                 status = nfs4_lock_expired(state, request);
6070         return status;
6071 }
6072 #endif
6073
6074 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6075 {
6076         struct nfs_inode *nfsi = NFS_I(state->inode);
6077         struct nfs4_state_owner *sp = state->owner;
6078         unsigned char fl_flags = request->fl_flags;
6079         int status = -ENOLCK;
6080
6081         if ((fl_flags & FL_POSIX) &&
6082                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
6083                 goto out;
6084         /* Is this a delegated open? */
6085         status = nfs4_set_lock_state(state, request);
6086         if (status != 0)
6087                 goto out;
6088         request->fl_flags |= FL_ACCESS;
6089         status = do_vfs_lock(state->inode, request);
6090         if (status < 0)
6091                 goto out;
6092         mutex_lock(&sp->so_delegreturn_mutex);
6093         down_read(&nfsi->rwsem);
6094         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
6095                 /* Yes: cache locks! */
6096                 /* ...but avoid races with delegation recall... */
6097                 request->fl_flags = fl_flags & ~FL_SLEEP;
6098                 status = do_vfs_lock(state->inode, request);
6099                 up_read(&nfsi->rwsem);
6100                 mutex_unlock(&sp->so_delegreturn_mutex);
6101                 goto out;
6102         }
6103         up_read(&nfsi->rwsem);
6104         mutex_unlock(&sp->so_delegreturn_mutex);
6105         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
6106 out:
6107         request->fl_flags = fl_flags;
6108         return status;
6109 }
6110
6111 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6112 {
6113         struct nfs4_exception exception = {
6114                 .state = state,
6115                 .inode = state->inode,
6116         };
6117         int err;
6118
6119         do {
6120                 err = _nfs4_proc_setlk(state, cmd, request);
6121                 if (err == -NFS4ERR_DENIED)
6122                         err = -EAGAIN;
6123                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
6124                                 err, &exception);
6125         } while (exception.retry);
6126         return err;
6127 }
6128
6129 static int
6130 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
6131 {
6132         struct nfs_open_context *ctx;
6133         struct nfs4_state *state;
6134         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
6135         int status;
6136
6137         /* verify open state */
6138         ctx = nfs_file_open_context(filp);
6139         state = ctx->state;
6140
6141         if (request->fl_start < 0 || request->fl_end < 0)
6142                 return -EINVAL;
6143
6144         if (IS_GETLK(cmd)) {
6145                 if (state != NULL)
6146                         return nfs4_proc_getlk(state, F_GETLK, request);
6147                 return 0;
6148         }
6149
6150         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
6151                 return -EINVAL;
6152
6153         if (request->fl_type == F_UNLCK) {
6154                 if (state != NULL)
6155                         return nfs4_proc_unlck(state, cmd, request);
6156                 return 0;
6157         }
6158
6159         if (state == NULL)
6160                 return -ENOLCK;
6161         /*
6162          * Don't rely on the VFS having checked the file open mode,
6163          * since it won't do this for flock() locks.
6164          */
6165         switch (request->fl_type) {
6166         case F_RDLCK:
6167                 if (!(filp->f_mode & FMODE_READ))
6168                         return -EBADF;
6169                 break;
6170         case F_WRLCK:
6171                 if (!(filp->f_mode & FMODE_WRITE))
6172                         return -EBADF;
6173         }
6174
6175         do {
6176                 status = nfs4_proc_setlk(state, cmd, request);
6177                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6178                         break;
6179                 timeout = nfs4_set_lock_task_retry(timeout);
6180                 status = -ERESTARTSYS;
6181                 if (signalled())
6182                         break;
6183         } while(status < 0);
6184         return status;
6185 }
6186
6187 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6188 {
6189         struct nfs_server *server = NFS_SERVER(state->inode);
6190         int err;
6191
6192         err = nfs4_set_lock_state(state, fl);
6193         if (err != 0)
6194                 return err;
6195         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6196         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6197 }
6198
6199 struct nfs_release_lockowner_data {
6200         struct nfs4_lock_state *lsp;
6201         struct nfs_server *server;
6202         struct nfs_release_lockowner_args args;
6203         struct nfs_release_lockowner_res res;
6204         unsigned long timestamp;
6205 };
6206
6207 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6208 {
6209         struct nfs_release_lockowner_data *data = calldata;
6210         struct nfs_server *server = data->server;
6211         nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6212                              &data->args.seq_args, &data->res.seq_res, task);
6213         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6214         data->timestamp = jiffies;
6215 }
6216
6217 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6218 {
6219         struct nfs_release_lockowner_data *data = calldata;
6220         struct nfs_server *server = data->server;
6221
6222         nfs40_sequence_done(task, &data->res.seq_res);
6223
6224         switch (task->tk_status) {
6225         case 0:
6226                 renew_lease(server, data->timestamp);
6227                 break;
6228         case -NFS4ERR_STALE_CLIENTID:
6229         case -NFS4ERR_EXPIRED:
6230                 nfs4_schedule_lease_recovery(server->nfs_client);
6231                 break;
6232         case -NFS4ERR_LEASE_MOVED:
6233         case -NFS4ERR_DELAY:
6234                 if (nfs4_async_handle_error(task, server,
6235                                             NULL, NULL) == -EAGAIN)
6236                         rpc_restart_call_prepare(task);
6237         }
6238 }
6239
6240 static void nfs4_release_lockowner_release(void *calldata)
6241 {
6242         struct nfs_release_lockowner_data *data = calldata;
6243         nfs4_free_lock_state(data->server, data->lsp);
6244         kfree(calldata);
6245 }
6246
6247 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6248         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6249         .rpc_call_done = nfs4_release_lockowner_done,
6250         .rpc_release = nfs4_release_lockowner_release,
6251 };
6252
6253 static void
6254 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6255 {
6256         struct nfs_release_lockowner_data *data;
6257         struct rpc_message msg = {
6258                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6259         };
6260
6261         if (server->nfs_client->cl_mvops->minor_version != 0)
6262                 return;
6263
6264         data = kmalloc(sizeof(*data), GFP_NOFS);
6265         if (!data)
6266                 return;
6267         data->lsp = lsp;
6268         data->server = server;
6269         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6270         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6271         data->args.lock_owner.s_dev = server->s_dev;
6272
6273         msg.rpc_argp = &data->args;
6274         msg.rpc_resp = &data->res;
6275         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6276         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6277 }
6278
6279 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6280
6281 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
6282                                    struct dentry *unused, struct inode *inode,
6283                                    const char *key, const void *buf,
6284                                    size_t buflen, int flags)
6285 {
6286         return nfs4_proc_set_acl(inode, buf, buflen);
6287 }
6288
6289 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
6290                                    struct dentry *unused, struct inode *inode,
6291                                    const char *key, void *buf, size_t buflen)
6292 {
6293         return nfs4_proc_get_acl(inode, buf, buflen);
6294 }
6295
6296 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
6297 {
6298         return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
6299 }
6300
6301 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6302
6303 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
6304                                      struct dentry *unused, struct inode *inode,
6305                                      const char *key, const void *buf,
6306                                      size_t buflen, int flags)
6307 {
6308         if (security_ismaclabel(key))
6309                 return nfs4_set_security_label(inode, buf, buflen);
6310
6311         return -EOPNOTSUPP;
6312 }
6313
6314 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
6315                                      struct dentry *unused, struct inode *inode,
6316                                      const char *key, void *buf, size_t buflen)
6317 {
6318         if (security_ismaclabel(key))
6319                 return nfs4_get_security_label(inode, buf, buflen);
6320         return -EOPNOTSUPP;
6321 }
6322
6323 static ssize_t
6324 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6325 {
6326         int len = 0;
6327
6328         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
6329                 len = security_inode_listsecurity(inode, list, list_len);
6330                 if (list_len && len > list_len)
6331                         return -ERANGE;
6332         }
6333         return len;
6334 }
6335
6336 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6337         .prefix = XATTR_SECURITY_PREFIX,
6338         .get    = nfs4_xattr_get_nfs4_label,
6339         .set    = nfs4_xattr_set_nfs4_label,
6340 };
6341
6342 #else
6343
6344 static ssize_t
6345 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6346 {
6347         return 0;
6348 }
6349
6350 #endif
6351
6352 /*
6353  * nfs_fhget will use either the mounted_on_fileid or the fileid
6354  */
6355 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6356 {
6357         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6358                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6359               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6360               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6361                 return;
6362
6363         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6364                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6365         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6366         fattr->nlink = 2;
6367 }
6368
6369 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6370                                    const struct qstr *name,
6371                                    struct nfs4_fs_locations *fs_locations,
6372                                    struct page *page)
6373 {
6374         struct nfs_server *server = NFS_SERVER(dir);
6375         u32 bitmask[3] = {
6376                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6377         };
6378         struct nfs4_fs_locations_arg args = {
6379                 .dir_fh = NFS_FH(dir),
6380                 .name = name,
6381                 .page = page,
6382                 .bitmask = bitmask,
6383         };
6384         struct nfs4_fs_locations_res res = {
6385                 .fs_locations = fs_locations,
6386         };
6387         struct rpc_message msg = {
6388                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6389                 .rpc_argp = &args,
6390                 .rpc_resp = &res,
6391         };
6392         int status;
6393
6394         dprintk("%s: start\n", __func__);
6395
6396         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6397          * is not supported */
6398         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6399                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6400         else
6401                 bitmask[0] |= FATTR4_WORD0_FILEID;
6402
6403         nfs_fattr_init(&fs_locations->fattr);
6404         fs_locations->server = server;
6405         fs_locations->nlocations = 0;
6406         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6407         dprintk("%s: returned status = %d\n", __func__, status);
6408         return status;
6409 }
6410
6411 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6412                            const struct qstr *name,
6413                            struct nfs4_fs_locations *fs_locations,
6414                            struct page *page)
6415 {
6416         struct nfs4_exception exception = { };
6417         int err;
6418         do {
6419                 err = _nfs4_proc_fs_locations(client, dir, name,
6420                                 fs_locations, page);
6421                 trace_nfs4_get_fs_locations(dir, name, err);
6422                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6423                                 &exception);
6424         } while (exception.retry);
6425         return err;
6426 }
6427
6428 /*
6429  * This operation also signals the server that this client is
6430  * performing migration recovery.  The server can stop returning
6431  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6432  * appended to this compound to identify the client ID which is
6433  * performing recovery.
6434  */
6435 static int _nfs40_proc_get_locations(struct inode *inode,
6436                                      struct nfs4_fs_locations *locations,
6437                                      struct page *page, struct rpc_cred *cred)
6438 {
6439         struct nfs_server *server = NFS_SERVER(inode);
6440         struct rpc_clnt *clnt = server->client;
6441         u32 bitmask[2] = {
6442                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6443         };
6444         struct nfs4_fs_locations_arg args = {
6445                 .clientid       = server->nfs_client->cl_clientid,
6446                 .fh             = NFS_FH(inode),
6447                 .page           = page,
6448                 .bitmask        = bitmask,
6449                 .migration      = 1,            /* skip LOOKUP */
6450                 .renew          = 1,            /* append RENEW */
6451         };
6452         struct nfs4_fs_locations_res res = {
6453                 .fs_locations   = locations,
6454                 .migration      = 1,
6455                 .renew          = 1,
6456         };
6457         struct rpc_message msg = {
6458                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6459                 .rpc_argp       = &args,
6460                 .rpc_resp       = &res,
6461                 .rpc_cred       = cred,
6462         };
6463         unsigned long now = jiffies;
6464         int status;
6465
6466         nfs_fattr_init(&locations->fattr);
6467         locations->server = server;
6468         locations->nlocations = 0;
6469
6470         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6471         nfs4_set_sequence_privileged(&args.seq_args);
6472         status = nfs4_call_sync_sequence(clnt, server, &msg,
6473                                         &args.seq_args, &res.seq_res);
6474         if (status)
6475                 return status;
6476
6477         renew_lease(server, now);
6478         return 0;
6479 }
6480
6481 #ifdef CONFIG_NFS_V4_1
6482
6483 /*
6484  * This operation also signals the server that this client is
6485  * performing migration recovery.  The server can stop asserting
6486  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6487  * performing this operation is identified in the SEQUENCE
6488  * operation in this compound.
6489  *
6490  * When the client supports GETATTR(fs_locations_info), it can
6491  * be plumbed in here.
6492  */
6493 static int _nfs41_proc_get_locations(struct inode *inode,
6494                                      struct nfs4_fs_locations *locations,
6495                                      struct page *page, struct rpc_cred *cred)
6496 {
6497         struct nfs_server *server = NFS_SERVER(inode);
6498         struct rpc_clnt *clnt = server->client;
6499         u32 bitmask[2] = {
6500                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6501         };
6502         struct nfs4_fs_locations_arg args = {
6503                 .fh             = NFS_FH(inode),
6504                 .page           = page,
6505                 .bitmask        = bitmask,
6506                 .migration      = 1,            /* skip LOOKUP */
6507         };
6508         struct nfs4_fs_locations_res res = {
6509                 .fs_locations   = locations,
6510                 .migration      = 1,
6511         };
6512         struct rpc_message msg = {
6513                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6514                 .rpc_argp       = &args,
6515                 .rpc_resp       = &res,
6516                 .rpc_cred       = cred,
6517         };
6518         int status;
6519
6520         nfs_fattr_init(&locations->fattr);
6521         locations->server = server;
6522         locations->nlocations = 0;
6523
6524         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6525         nfs4_set_sequence_privileged(&args.seq_args);
6526         status = nfs4_call_sync_sequence(clnt, server, &msg,
6527                                         &args.seq_args, &res.seq_res);
6528         if (status == NFS4_OK &&
6529             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6530                 status = -NFS4ERR_LEASE_MOVED;
6531         return status;
6532 }
6533
6534 #endif  /* CONFIG_NFS_V4_1 */
6535
6536 /**
6537  * nfs4_proc_get_locations - discover locations for a migrated FSID
6538  * @inode: inode on FSID that is migrating
6539  * @locations: result of query
6540  * @page: buffer
6541  * @cred: credential to use for this operation
6542  *
6543  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6544  * operation failed, or a negative errno if a local error occurred.
6545  *
6546  * On success, "locations" is filled in, but if the server has
6547  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6548  * asserted.
6549  *
6550  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6551  * from this client that require migration recovery.
6552  */
6553 int nfs4_proc_get_locations(struct inode *inode,
6554                             struct nfs4_fs_locations *locations,
6555                             struct page *page, struct rpc_cred *cred)
6556 {
6557         struct nfs_server *server = NFS_SERVER(inode);
6558         struct nfs_client *clp = server->nfs_client;
6559         const struct nfs4_mig_recovery_ops *ops =
6560                                         clp->cl_mvops->mig_recovery_ops;
6561         struct nfs4_exception exception = { };
6562         int status;
6563
6564         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6565                 (unsigned long long)server->fsid.major,
6566                 (unsigned long long)server->fsid.minor,
6567                 clp->cl_hostname);
6568         nfs_display_fhandle(NFS_FH(inode), __func__);
6569
6570         do {
6571                 status = ops->get_locations(inode, locations, page, cred);
6572                 if (status != -NFS4ERR_DELAY)
6573                         break;
6574                 nfs4_handle_exception(server, status, &exception);
6575         } while (exception.retry);
6576         return status;
6577 }
6578
6579 /*
6580  * This operation also signals the server that this client is
6581  * performing "lease moved" recovery.  The server can stop
6582  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6583  * is appended to this compound to identify the client ID which is
6584  * performing recovery.
6585  */
6586 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6587 {
6588         struct nfs_server *server = NFS_SERVER(inode);
6589         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6590         struct rpc_clnt *clnt = server->client;
6591         struct nfs4_fsid_present_arg args = {
6592                 .fh             = NFS_FH(inode),
6593                 .clientid       = clp->cl_clientid,
6594                 .renew          = 1,            /* append RENEW */
6595         };
6596         struct nfs4_fsid_present_res res = {
6597                 .renew          = 1,
6598         };
6599         struct rpc_message msg = {
6600                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6601                 .rpc_argp       = &args,
6602                 .rpc_resp       = &res,
6603                 .rpc_cred       = cred,
6604         };
6605         unsigned long now = jiffies;
6606         int status;
6607
6608         res.fh = nfs_alloc_fhandle();
6609         if (res.fh == NULL)
6610                 return -ENOMEM;
6611
6612         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6613         nfs4_set_sequence_privileged(&args.seq_args);
6614         status = nfs4_call_sync_sequence(clnt, server, &msg,
6615                                                 &args.seq_args, &res.seq_res);
6616         nfs_free_fhandle(res.fh);
6617         if (status)
6618                 return status;
6619
6620         do_renew_lease(clp, now);
6621         return 0;
6622 }
6623
6624 #ifdef CONFIG_NFS_V4_1
6625
6626 /*
6627  * This operation also signals the server that this client is
6628  * performing "lease moved" recovery.  The server can stop asserting
6629  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6630  * this operation is identified in the SEQUENCE operation in this
6631  * compound.
6632  */
6633 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6634 {
6635         struct nfs_server *server = NFS_SERVER(inode);
6636         struct rpc_clnt *clnt = server->client;
6637         struct nfs4_fsid_present_arg args = {
6638                 .fh             = NFS_FH(inode),
6639         };
6640         struct nfs4_fsid_present_res res = {
6641         };
6642         struct rpc_message msg = {
6643                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6644                 .rpc_argp       = &args,
6645                 .rpc_resp       = &res,
6646                 .rpc_cred       = cred,
6647         };
6648         int status;
6649
6650         res.fh = nfs_alloc_fhandle();
6651         if (res.fh == NULL)
6652                 return -ENOMEM;
6653
6654         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6655         nfs4_set_sequence_privileged(&args.seq_args);
6656         status = nfs4_call_sync_sequence(clnt, server, &msg,
6657                                                 &args.seq_args, &res.seq_res);
6658         nfs_free_fhandle(res.fh);
6659         if (status == NFS4_OK &&
6660             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6661                 status = -NFS4ERR_LEASE_MOVED;
6662         return status;
6663 }
6664
6665 #endif  /* CONFIG_NFS_V4_1 */
6666
6667 /**
6668  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6669  * @inode: inode on FSID to check
6670  * @cred: credential to use for this operation
6671  *
6672  * Server indicates whether the FSID is present, moved, or not
6673  * recognized.  This operation is necessary to clear a LEASE_MOVED
6674  * condition for this client ID.
6675  *
6676  * Returns NFS4_OK if the FSID is present on this server,
6677  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6678  *  NFS4ERR code if some error occurred on the server, or a
6679  *  negative errno if a local failure occurred.
6680  */
6681 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6682 {
6683         struct nfs_server *server = NFS_SERVER(inode);
6684         struct nfs_client *clp = server->nfs_client;
6685         const struct nfs4_mig_recovery_ops *ops =
6686                                         clp->cl_mvops->mig_recovery_ops;
6687         struct nfs4_exception exception = { };
6688         int status;
6689
6690         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6691                 (unsigned long long)server->fsid.major,
6692                 (unsigned long long)server->fsid.minor,
6693                 clp->cl_hostname);
6694         nfs_display_fhandle(NFS_FH(inode), __func__);
6695
6696         do {
6697                 status = ops->fsid_present(inode, cred);
6698                 if (status != -NFS4ERR_DELAY)
6699                         break;
6700                 nfs4_handle_exception(server, status, &exception);
6701         } while (exception.retry);
6702         return status;
6703 }
6704
6705 /**
6706  * If 'use_integrity' is true and the state managment nfs_client
6707  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6708  * and the machine credential as per RFC3530bis and RFC5661 Security
6709  * Considerations sections. Otherwise, just use the user cred with the
6710  * filesystem's rpc_client.
6711  */
6712 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6713 {
6714         int status;
6715         struct nfs4_secinfo_arg args = {
6716                 .dir_fh = NFS_FH(dir),
6717                 .name   = name,
6718         };
6719         struct nfs4_secinfo_res res = {
6720                 .flavors     = flavors,
6721         };
6722         struct rpc_message msg = {
6723                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6724                 .rpc_argp = &args,
6725                 .rpc_resp = &res,
6726         };
6727         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6728         struct rpc_cred *cred = NULL;
6729
6730         if (use_integrity) {
6731                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6732                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6733                 msg.rpc_cred = cred;
6734         }
6735
6736         dprintk("NFS call  secinfo %s\n", name->name);
6737
6738         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6739                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6740
6741         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6742                                 &res.seq_res, 0);
6743         dprintk("NFS reply  secinfo: %d\n", status);
6744
6745         if (cred)
6746                 put_rpccred(cred);
6747
6748         return status;
6749 }
6750
6751 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6752                       struct nfs4_secinfo_flavors *flavors)
6753 {
6754         struct nfs4_exception exception = { };
6755         int err;
6756         do {
6757                 err = -NFS4ERR_WRONGSEC;
6758
6759                 /* try to use integrity protection with machine cred */
6760                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6761                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6762
6763                 /*
6764                  * if unable to use integrity protection, or SECINFO with
6765                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6766                  * disallowed by spec, but exists in deployed servers) use
6767                  * the current filesystem's rpc_client and the user cred.
6768                  */
6769                 if (err == -NFS4ERR_WRONGSEC)
6770                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6771
6772                 trace_nfs4_secinfo(dir, name, err);
6773                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6774                                 &exception);
6775         } while (exception.retry);
6776         return err;
6777 }
6778
6779 #ifdef CONFIG_NFS_V4_1
6780 /*
6781  * Check the exchange flags returned by the server for invalid flags, having
6782  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6783  * DS flags set.
6784  */
6785 static int nfs4_check_cl_exchange_flags(u32 flags)
6786 {
6787         if (flags & ~EXCHGID4_FLAG_MASK_R)
6788                 goto out_inval;
6789         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6790             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6791                 goto out_inval;
6792         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6793                 goto out_inval;
6794         return NFS_OK;
6795 out_inval:
6796         return -NFS4ERR_INVAL;
6797 }
6798
6799 static bool
6800 nfs41_same_server_scope(struct nfs41_server_scope *a,
6801                         struct nfs41_server_scope *b)
6802 {
6803         if (a->server_scope_sz == b->server_scope_sz &&
6804             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6805                 return true;
6806
6807         return false;
6808 }
6809
6810 static void
6811 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
6812 {
6813 }
6814
6815 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
6816         .rpc_call_done =  &nfs4_bind_one_conn_to_session_done,
6817 };
6818
6819 /*
6820  * nfs4_proc_bind_one_conn_to_session()
6821  *
6822  * The 4.1 client currently uses the same TCP connection for the
6823  * fore and backchannel.
6824  */
6825 static
6826 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
6827                 struct rpc_xprt *xprt,
6828                 struct nfs_client *clp,
6829                 struct rpc_cred *cred)
6830 {
6831         int status;
6832         struct nfs41_bind_conn_to_session_args args = {
6833                 .client = clp,
6834                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
6835         };
6836         struct nfs41_bind_conn_to_session_res res;
6837         struct rpc_message msg = {
6838                 .rpc_proc =
6839                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6840                 .rpc_argp = &args,
6841                 .rpc_resp = &res,
6842                 .rpc_cred = cred,
6843         };
6844         struct rpc_task_setup task_setup_data = {
6845                 .rpc_client = clnt,
6846                 .rpc_xprt = xprt,
6847                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
6848                 .rpc_message = &msg,
6849                 .flags = RPC_TASK_TIMEOUT,
6850         };
6851         struct rpc_task *task;
6852
6853         dprintk("--> %s\n", __func__);
6854
6855         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
6856         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
6857                 args.dir = NFS4_CDFC4_FORE;
6858
6859         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
6860         if (xprt != rcu_access_pointer(clnt->cl_xprt))
6861                 args.dir = NFS4_CDFC4_FORE;
6862
6863         task = rpc_run_task(&task_setup_data);
6864         if (!IS_ERR(task)) {
6865                 status = task->tk_status;
6866                 rpc_put_task(task);
6867         } else
6868                 status = PTR_ERR(task);
6869         trace_nfs4_bind_conn_to_session(clp, status);
6870         if (status == 0) {
6871                 if (memcmp(res.sessionid.data,
6872                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6873                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6874                         status = -EIO;
6875                         goto out;
6876                 }
6877                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
6878                         dprintk("NFS: %s: Unexpected direction from server\n",
6879                                 __func__);
6880                         status = -EIO;
6881                         goto out;
6882                 }
6883                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
6884                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6885                                 __func__);
6886                         status = -EIO;
6887                         goto out;
6888                 }
6889         }
6890 out:
6891         dprintk("<-- %s status= %d\n", __func__, status);
6892         return status;
6893 }
6894
6895 struct rpc_bind_conn_calldata {
6896         struct nfs_client *clp;
6897         struct rpc_cred *cred;
6898 };
6899
6900 static int
6901 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
6902                 struct rpc_xprt *xprt,
6903                 void *calldata)
6904 {
6905         struct rpc_bind_conn_calldata *p = calldata;
6906
6907         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
6908 }
6909
6910 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6911 {
6912         struct rpc_bind_conn_calldata data = {
6913                 .clp = clp,
6914                 .cred = cred,
6915         };
6916         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
6917                         nfs4_proc_bind_conn_to_session_callback, &data);
6918 }
6919
6920 /*
6921  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6922  * and operations we'd like to see to enable certain features in the allow map
6923  */
6924 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6925         .how = SP4_MACH_CRED,
6926         .enforce.u.words = {
6927                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6928                       1 << (OP_EXCHANGE_ID - 32) |
6929                       1 << (OP_CREATE_SESSION - 32) |
6930                       1 << (OP_DESTROY_SESSION - 32) |
6931                       1 << (OP_DESTROY_CLIENTID - 32)
6932         },
6933         .allow.u.words = {
6934                 [0] = 1 << (OP_CLOSE) |
6935                       1 << (OP_OPEN_DOWNGRADE) |
6936                       1 << (OP_LOCKU) |
6937                       1 << (OP_DELEGRETURN) |
6938                       1 << (OP_COMMIT),
6939                 [1] = 1 << (OP_SECINFO - 32) |
6940                       1 << (OP_SECINFO_NO_NAME - 32) |
6941                       1 << (OP_LAYOUTRETURN - 32) |
6942                       1 << (OP_TEST_STATEID - 32) |
6943                       1 << (OP_FREE_STATEID - 32) |
6944                       1 << (OP_WRITE - 32)
6945         }
6946 };
6947
6948 /*
6949  * Select the state protection mode for client `clp' given the server results
6950  * from exchange_id in `sp'.
6951  *
6952  * Returns 0 on success, negative errno otherwise.
6953  */
6954 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6955                                  struct nfs41_state_protection *sp)
6956 {
6957         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6958                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6959                       1 << (OP_EXCHANGE_ID - 32) |
6960                       1 << (OP_CREATE_SESSION - 32) |
6961                       1 << (OP_DESTROY_SESSION - 32) |
6962                       1 << (OP_DESTROY_CLIENTID - 32)
6963         };
6964         unsigned int i;
6965
6966         if (sp->how == SP4_MACH_CRED) {
6967                 /* Print state protect result */
6968                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6969                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6970                         if (test_bit(i, sp->enforce.u.longs))
6971                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6972                         if (test_bit(i, sp->allow.u.longs))
6973                                 dfprintk(MOUNT, "  allow op %d\n", i);
6974                 }
6975
6976                 /* make sure nothing is on enforce list that isn't supported */
6977                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6978                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6979                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6980                                 return -EINVAL;
6981                         }
6982                 }
6983
6984                 /*
6985                  * Minimal mode - state operations are allowed to use machine
6986                  * credential.  Note this already happens by default, so the
6987                  * client doesn't have to do anything more than the negotiation.
6988                  *
6989                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6990                  *       we're already using the machine cred for exchange_id
6991                  *       and will never use a different cred.
6992                  */
6993                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6994                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6995                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6996                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6997                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6998                         dfprintk(MOUNT, "  minimal mode enabled\n");
6999                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
7000                 } else {
7001                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7002                         return -EINVAL;
7003                 }
7004
7005                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
7006                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
7007                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
7008                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
7009                         dfprintk(MOUNT, "  cleanup mode enabled\n");
7010                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
7011                 }
7012
7013                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
7014                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
7015                         set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP,
7016                                 &clp->cl_sp4_flags);
7017                 }
7018
7019                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
7020                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
7021                         dfprintk(MOUNT, "  secinfo mode enabled\n");
7022                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
7023                 }
7024
7025                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
7026                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
7027                         dfprintk(MOUNT, "  stateid mode enabled\n");
7028                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
7029                 }
7030
7031                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
7032                         dfprintk(MOUNT, "  write mode enabled\n");
7033                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
7034                 }
7035
7036                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
7037                         dfprintk(MOUNT, "  commit mode enabled\n");
7038                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
7039                 }
7040         }
7041
7042         return 0;
7043 }
7044
7045 /*
7046  * _nfs4_proc_exchange_id()
7047  *
7048  * Wrapper for EXCHANGE_ID operation.
7049  */
7050 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
7051         u32 sp4_how)
7052 {
7053         nfs4_verifier verifier;
7054         struct nfs41_exchange_id_args args = {
7055                 .verifier = &verifier,
7056                 .client = clp,
7057 #ifdef CONFIG_NFS_V4_1_MIGRATION
7058                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
7059                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
7060                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
7061 #else
7062                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
7063                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
7064 #endif
7065         };
7066         struct nfs41_exchange_id_res res = {
7067                 0
7068         };
7069         int status;
7070         struct rpc_message msg = {
7071                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
7072                 .rpc_argp = &args,
7073                 .rpc_resp = &res,
7074                 .rpc_cred = cred,
7075         };
7076
7077         nfs4_init_boot_verifier(clp, &verifier);
7078
7079         status = nfs4_init_uniform_client_string(clp);
7080         if (status)
7081                 goto out;
7082
7083         dprintk("NFS call  exchange_id auth=%s, '%s'\n",
7084                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
7085                 clp->cl_owner_id);
7086
7087         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
7088                                         GFP_NOFS);
7089         if (unlikely(res.server_owner == NULL)) {
7090                 status = -ENOMEM;
7091                 goto out;
7092         }
7093
7094         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
7095                                         GFP_NOFS);
7096         if (unlikely(res.server_scope == NULL)) {
7097                 status = -ENOMEM;
7098                 goto out_server_owner;
7099         }
7100
7101         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
7102         if (unlikely(res.impl_id == NULL)) {
7103                 status = -ENOMEM;
7104                 goto out_server_scope;
7105         }
7106
7107         switch (sp4_how) {
7108         case SP4_NONE:
7109                 args.state_protect.how = SP4_NONE;
7110                 break;
7111
7112         case SP4_MACH_CRED:
7113                 args.state_protect = nfs4_sp4_mach_cred_request;
7114                 break;
7115
7116         default:
7117                 /* unsupported! */
7118                 WARN_ON_ONCE(1);
7119                 status = -EINVAL;
7120                 goto out_impl_id;
7121         }
7122
7123         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7124         trace_nfs4_exchange_id(clp, status);
7125         if (status == 0)
7126                 status = nfs4_check_cl_exchange_flags(res.flags);
7127
7128         if (status == 0)
7129                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
7130
7131         if (status == 0) {
7132                 clp->cl_clientid = res.clientid;
7133                 clp->cl_exchange_flags = res.flags;
7134                 /* Client ID is not confirmed */
7135                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
7136                         clear_bit(NFS4_SESSION_ESTABLISHED,
7137                                         &clp->cl_session->session_state);
7138                         clp->cl_seqid = res.seqid;
7139                 }
7140
7141                 kfree(clp->cl_serverowner);
7142                 clp->cl_serverowner = res.server_owner;
7143                 res.server_owner = NULL;
7144
7145                 /* use the most recent implementation id */
7146                 kfree(clp->cl_implid);
7147                 clp->cl_implid = res.impl_id;
7148                 res.impl_id = NULL;
7149
7150                 if (clp->cl_serverscope != NULL &&
7151                     !nfs41_same_server_scope(clp->cl_serverscope,
7152                                              res.server_scope)) {
7153                         dprintk("%s: server_scope mismatch detected\n",
7154                                 __func__);
7155                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
7156                         kfree(clp->cl_serverscope);
7157                         clp->cl_serverscope = NULL;
7158                 }
7159
7160                 if (clp->cl_serverscope == NULL) {
7161                         clp->cl_serverscope = res.server_scope;
7162                         res.server_scope = NULL;
7163                 }
7164         }
7165
7166 out_impl_id:
7167         kfree(res.impl_id);
7168 out_server_scope:
7169         kfree(res.server_scope);
7170 out_server_owner:
7171         kfree(res.server_owner);
7172 out:
7173         if (clp->cl_implid != NULL)
7174                 dprintk("NFS reply exchange_id: Server Implementation ID: "
7175                         "domain: %s, name: %s, date: %llu,%u\n",
7176                         clp->cl_implid->domain, clp->cl_implid->name,
7177                         clp->cl_implid->date.seconds,
7178                         clp->cl_implid->date.nseconds);
7179         dprintk("NFS reply exchange_id: %d\n", status);
7180         return status;
7181 }
7182
7183 /*
7184  * nfs4_proc_exchange_id()
7185  *
7186  * Returns zero, a negative errno, or a negative NFS4ERR status code.
7187  *
7188  * Since the clientid has expired, all compounds using sessions
7189  * associated with the stale clientid will be returning
7190  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
7191  * be in some phase of session reset.
7192  *
7193  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
7194  */
7195 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
7196 {
7197         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
7198         int status;
7199
7200         /* try SP4_MACH_CRED if krb5i/p */
7201         if (authflavor == RPC_AUTH_GSS_KRB5I ||
7202             authflavor == RPC_AUTH_GSS_KRB5P) {
7203                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
7204                 if (!status)
7205                         return 0;
7206         }
7207
7208         /* try SP4_NONE */
7209         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
7210 }
7211
7212 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
7213                 struct rpc_cred *cred)
7214 {
7215         struct rpc_message msg = {
7216                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
7217                 .rpc_argp = clp,
7218                 .rpc_cred = cred,
7219         };
7220         int status;
7221
7222         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7223         trace_nfs4_destroy_clientid(clp, status);
7224         if (status)
7225                 dprintk("NFS: Got error %d from the server %s on "
7226                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
7227         return status;
7228 }
7229
7230 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
7231                 struct rpc_cred *cred)
7232 {
7233         unsigned int loop;
7234         int ret;
7235
7236         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
7237                 ret = _nfs4_proc_destroy_clientid(clp, cred);
7238                 switch (ret) {
7239                 case -NFS4ERR_DELAY:
7240                 case -NFS4ERR_CLIENTID_BUSY:
7241                         ssleep(1);
7242                         break;
7243                 default:
7244                         return ret;
7245                 }
7246         }
7247         return 0;
7248 }
7249
7250 int nfs4_destroy_clientid(struct nfs_client *clp)
7251 {
7252         struct rpc_cred *cred;
7253         int ret = 0;
7254
7255         if (clp->cl_mvops->minor_version < 1)
7256                 goto out;
7257         if (clp->cl_exchange_flags == 0)
7258                 goto out;
7259         if (clp->cl_preserve_clid)
7260                 goto out;
7261         cred = nfs4_get_clid_cred(clp);
7262         ret = nfs4_proc_destroy_clientid(clp, cred);
7263         if (cred)
7264                 put_rpccred(cred);
7265         switch (ret) {
7266         case 0:
7267         case -NFS4ERR_STALE_CLIENTID:
7268                 clp->cl_exchange_flags = 0;
7269         }
7270 out:
7271         return ret;
7272 }
7273
7274 struct nfs4_get_lease_time_data {
7275         struct nfs4_get_lease_time_args *args;
7276         struct nfs4_get_lease_time_res *res;
7277         struct nfs_client *clp;
7278 };
7279
7280 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7281                                         void *calldata)
7282 {
7283         struct nfs4_get_lease_time_data *data =
7284                         (struct nfs4_get_lease_time_data *)calldata;
7285
7286         dprintk("--> %s\n", __func__);
7287         /* just setup sequence, do not trigger session recovery
7288            since we're invoked within one */
7289         nfs41_setup_sequence(data->clp->cl_session,
7290                         &data->args->la_seq_args,
7291                         &data->res->lr_seq_res,
7292                         task);
7293         dprintk("<-- %s\n", __func__);
7294 }
7295
7296 /*
7297  * Called from nfs4_state_manager thread for session setup, so don't recover
7298  * from sequence operation or clientid errors.
7299  */
7300 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7301 {
7302         struct nfs4_get_lease_time_data *data =
7303                         (struct nfs4_get_lease_time_data *)calldata;
7304
7305         dprintk("--> %s\n", __func__);
7306         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7307                 return;
7308         switch (task->tk_status) {
7309         case -NFS4ERR_DELAY:
7310         case -NFS4ERR_GRACE:
7311                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7312                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7313                 task->tk_status = 0;
7314                 /* fall through */
7315         case -NFS4ERR_RETRY_UNCACHED_REP:
7316                 rpc_restart_call_prepare(task);
7317                 return;
7318         }
7319         dprintk("<-- %s\n", __func__);
7320 }
7321
7322 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7323         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7324         .rpc_call_done = nfs4_get_lease_time_done,
7325 };
7326
7327 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7328 {
7329         struct rpc_task *task;
7330         struct nfs4_get_lease_time_args args;
7331         struct nfs4_get_lease_time_res res = {
7332                 .lr_fsinfo = fsinfo,
7333         };
7334         struct nfs4_get_lease_time_data data = {
7335                 .args = &args,
7336                 .res = &res,
7337                 .clp = clp,
7338         };
7339         struct rpc_message msg = {
7340                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7341                 .rpc_argp = &args,
7342                 .rpc_resp = &res,
7343         };
7344         struct rpc_task_setup task_setup = {
7345                 .rpc_client = clp->cl_rpcclient,
7346                 .rpc_message = &msg,
7347                 .callback_ops = &nfs4_get_lease_time_ops,
7348                 .callback_data = &data,
7349                 .flags = RPC_TASK_TIMEOUT,
7350         };
7351         int status;
7352
7353         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7354         nfs4_set_sequence_privileged(&args.la_seq_args);
7355         dprintk("--> %s\n", __func__);
7356         task = rpc_run_task(&task_setup);
7357
7358         if (IS_ERR(task))
7359                 status = PTR_ERR(task);
7360         else {
7361                 status = task->tk_status;
7362                 rpc_put_task(task);
7363         }
7364         dprintk("<-- %s return %d\n", __func__, status);
7365
7366         return status;
7367 }
7368
7369 /*
7370  * Initialize the values to be used by the client in CREATE_SESSION
7371  * If nfs4_init_session set the fore channel request and response sizes,
7372  * use them.
7373  *
7374  * Set the back channel max_resp_sz_cached to zero to force the client to
7375  * always set csa_cachethis to FALSE because the current implementation
7376  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7377  */
7378 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
7379                                     struct rpc_clnt *clnt)
7380 {
7381         unsigned int max_rqst_sz, max_resp_sz;
7382         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
7383
7384         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7385         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7386
7387         /* Fore channel attributes */
7388         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7389         args->fc_attrs.max_resp_sz = max_resp_sz;
7390         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7391         args->fc_attrs.max_reqs = max_session_slots;
7392
7393         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7394                 "max_ops=%u max_reqs=%u\n",
7395                 __func__,
7396                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7397                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7398
7399         /* Back channel attributes */
7400         args->bc_attrs.max_rqst_sz = max_bc_payload;
7401         args->bc_attrs.max_resp_sz = max_bc_payload;
7402         args->bc_attrs.max_resp_sz_cached = 0;
7403         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7404         args->bc_attrs.max_reqs = NFS41_BC_MAX_CALLBACKS;
7405
7406         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7407                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7408                 __func__,
7409                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7410                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7411                 args->bc_attrs.max_reqs);
7412 }
7413
7414 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
7415                 struct nfs41_create_session_res *res)
7416 {
7417         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7418         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
7419
7420         if (rcvd->max_resp_sz > sent->max_resp_sz)
7421                 return -EINVAL;
7422         /*
7423          * Our requested max_ops is the minimum we need; we're not
7424          * prepared to break up compounds into smaller pieces than that.
7425          * So, no point even trying to continue if the server won't
7426          * cooperate:
7427          */
7428         if (rcvd->max_ops < sent->max_ops)
7429                 return -EINVAL;
7430         if (rcvd->max_reqs == 0)
7431                 return -EINVAL;
7432         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7433                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7434         return 0;
7435 }
7436
7437 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
7438                 struct nfs41_create_session_res *res)
7439 {
7440         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7441         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
7442
7443         if (!(res->flags & SESSION4_BACK_CHAN))
7444                 goto out;
7445         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7446                 return -EINVAL;
7447         if (rcvd->max_resp_sz < sent->max_resp_sz)
7448                 return -EINVAL;
7449         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7450                 return -EINVAL;
7451         /* These would render the backchannel useless: */
7452         if (rcvd->max_ops != sent->max_ops)
7453                 return -EINVAL;
7454         if (rcvd->max_reqs != sent->max_reqs)
7455                 return -EINVAL;
7456 out:
7457         return 0;
7458 }
7459
7460 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7461                                      struct nfs41_create_session_res *res)
7462 {
7463         int ret;
7464
7465         ret = nfs4_verify_fore_channel_attrs(args, res);
7466         if (ret)
7467                 return ret;
7468         return nfs4_verify_back_channel_attrs(args, res);
7469 }
7470
7471 static void nfs4_update_session(struct nfs4_session *session,
7472                 struct nfs41_create_session_res *res)
7473 {
7474         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
7475         /* Mark client id and session as being confirmed */
7476         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
7477         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
7478         session->flags = res->flags;
7479         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
7480         if (res->flags & SESSION4_BACK_CHAN)
7481                 memcpy(&session->bc_attrs, &res->bc_attrs,
7482                                 sizeof(session->bc_attrs));
7483 }
7484
7485 static int _nfs4_proc_create_session(struct nfs_client *clp,
7486                 struct rpc_cred *cred)
7487 {
7488         struct nfs4_session *session = clp->cl_session;
7489         struct nfs41_create_session_args args = {
7490                 .client = clp,
7491                 .clientid = clp->cl_clientid,
7492                 .seqid = clp->cl_seqid,
7493                 .cb_program = NFS4_CALLBACK,
7494         };
7495         struct nfs41_create_session_res res;
7496
7497         struct rpc_message msg = {
7498                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7499                 .rpc_argp = &args,
7500                 .rpc_resp = &res,
7501                 .rpc_cred = cred,
7502         };
7503         int status;
7504
7505         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
7506         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7507
7508         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7509         trace_nfs4_create_session(clp, status);
7510
7511         if (!status) {
7512                 /* Verify the session's negotiated channel_attrs values */
7513                 status = nfs4_verify_channel_attrs(&args, &res);
7514                 /* Increment the clientid slot sequence id */
7515                 if (clp->cl_seqid == res.seqid)
7516                         clp->cl_seqid++;
7517                 if (status)
7518                         goto out;
7519                 nfs4_update_session(session, &res);
7520         }
7521 out:
7522         return status;
7523 }
7524
7525 /*
7526  * Issues a CREATE_SESSION operation to the server.
7527  * It is the responsibility of the caller to verify the session is
7528  * expired before calling this routine.
7529  */
7530 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7531 {
7532         int status;
7533         unsigned *ptr;
7534         struct nfs4_session *session = clp->cl_session;
7535
7536         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7537
7538         status = _nfs4_proc_create_session(clp, cred);
7539         if (status)
7540                 goto out;
7541
7542         /* Init or reset the session slot tables */
7543         status = nfs4_setup_session_slot_tables(session);
7544         dprintk("slot table setup returned %d\n", status);
7545         if (status)
7546                 goto out;
7547
7548         ptr = (unsigned *)&session->sess_id.data[0];
7549         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7550                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7551 out:
7552         dprintk("<-- %s\n", __func__);
7553         return status;
7554 }
7555
7556 /*
7557  * Issue the over-the-wire RPC DESTROY_SESSION.
7558  * The caller must serialize access to this routine.
7559  */
7560 int nfs4_proc_destroy_session(struct nfs4_session *session,
7561                 struct rpc_cred *cred)
7562 {
7563         struct rpc_message msg = {
7564                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7565                 .rpc_argp = session,
7566                 .rpc_cred = cred,
7567         };
7568         int status = 0;
7569
7570         dprintk("--> nfs4_proc_destroy_session\n");
7571
7572         /* session is still being setup */
7573         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
7574                 return 0;
7575
7576         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7577         trace_nfs4_destroy_session(session->clp, status);
7578
7579         if (status)
7580                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7581                         "Session has been destroyed regardless...\n", status);
7582
7583         dprintk("<-- nfs4_proc_destroy_session\n");
7584         return status;
7585 }
7586
7587 /*
7588  * Renew the cl_session lease.
7589  */
7590 struct nfs4_sequence_data {
7591         struct nfs_client *clp;
7592         struct nfs4_sequence_args args;
7593         struct nfs4_sequence_res res;
7594 };
7595
7596 static void nfs41_sequence_release(void *data)
7597 {
7598         struct nfs4_sequence_data *calldata = data;
7599         struct nfs_client *clp = calldata->clp;
7600
7601         if (atomic_read(&clp->cl_count) > 1)
7602                 nfs4_schedule_state_renewal(clp);
7603         nfs_put_client(clp);
7604         kfree(calldata);
7605 }
7606
7607 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7608 {
7609         switch(task->tk_status) {
7610         case -NFS4ERR_DELAY:
7611                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7612                 return -EAGAIN;
7613         default:
7614                 nfs4_schedule_lease_recovery(clp);
7615         }
7616         return 0;
7617 }
7618
7619 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7620 {
7621         struct nfs4_sequence_data *calldata = data;
7622         struct nfs_client *clp = calldata->clp;
7623
7624         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7625                 return;
7626
7627         trace_nfs4_sequence(clp, task->tk_status);
7628         if (task->tk_status < 0) {
7629                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7630                 if (atomic_read(&clp->cl_count) == 1)
7631                         goto out;
7632
7633                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7634                         rpc_restart_call_prepare(task);
7635                         return;
7636                 }
7637         }
7638         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7639 out:
7640         dprintk("<-- %s\n", __func__);
7641 }
7642
7643 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7644 {
7645         struct nfs4_sequence_data *calldata = data;
7646         struct nfs_client *clp = calldata->clp;
7647         struct nfs4_sequence_args *args;
7648         struct nfs4_sequence_res *res;
7649
7650         args = task->tk_msg.rpc_argp;
7651         res = task->tk_msg.rpc_resp;
7652
7653         nfs41_setup_sequence(clp->cl_session, args, res, task);
7654 }
7655
7656 static const struct rpc_call_ops nfs41_sequence_ops = {
7657         .rpc_call_done = nfs41_sequence_call_done,
7658         .rpc_call_prepare = nfs41_sequence_prepare,
7659         .rpc_release = nfs41_sequence_release,
7660 };
7661
7662 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7663                 struct rpc_cred *cred,
7664                 bool is_privileged)
7665 {
7666         struct nfs4_sequence_data *calldata;
7667         struct rpc_message msg = {
7668                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7669                 .rpc_cred = cred,
7670         };
7671         struct rpc_task_setup task_setup_data = {
7672                 .rpc_client = clp->cl_rpcclient,
7673                 .rpc_message = &msg,
7674                 .callback_ops = &nfs41_sequence_ops,
7675                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7676         };
7677
7678         if (!atomic_inc_not_zero(&clp->cl_count))
7679                 return ERR_PTR(-EIO);
7680         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7681         if (calldata == NULL) {
7682                 nfs_put_client(clp);
7683                 return ERR_PTR(-ENOMEM);
7684         }
7685         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7686         if (is_privileged)
7687                 nfs4_set_sequence_privileged(&calldata->args);
7688         msg.rpc_argp = &calldata->args;
7689         msg.rpc_resp = &calldata->res;
7690         calldata->clp = clp;
7691         task_setup_data.callback_data = calldata;
7692
7693         return rpc_run_task(&task_setup_data);
7694 }
7695
7696 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7697 {
7698         struct rpc_task *task;
7699         int ret = 0;
7700
7701         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7702                 return -EAGAIN;
7703         task = _nfs41_proc_sequence(clp, cred, false);
7704         if (IS_ERR(task))
7705                 ret = PTR_ERR(task);
7706         else
7707                 rpc_put_task_async(task);
7708         dprintk("<-- %s status=%d\n", __func__, ret);
7709         return ret;
7710 }
7711
7712 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7713 {
7714         struct rpc_task *task;
7715         int ret;
7716
7717         task = _nfs41_proc_sequence(clp, cred, true);
7718         if (IS_ERR(task)) {
7719                 ret = PTR_ERR(task);
7720                 goto out;
7721         }
7722         ret = rpc_wait_for_completion_task(task);
7723         if (!ret)
7724                 ret = task->tk_status;
7725         rpc_put_task(task);
7726 out:
7727         dprintk("<-- %s status=%d\n", __func__, ret);
7728         return ret;
7729 }
7730
7731 struct nfs4_reclaim_complete_data {
7732         struct nfs_client *clp;
7733         struct nfs41_reclaim_complete_args arg;
7734         struct nfs41_reclaim_complete_res res;
7735 };
7736
7737 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7738 {
7739         struct nfs4_reclaim_complete_data *calldata = data;
7740
7741         nfs41_setup_sequence(calldata->clp->cl_session,
7742                         &calldata->arg.seq_args,
7743                         &calldata->res.seq_res,
7744                         task);
7745 }
7746
7747 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7748 {
7749         switch(task->tk_status) {
7750         case 0:
7751         case -NFS4ERR_COMPLETE_ALREADY:
7752         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7753                 break;
7754         case -NFS4ERR_DELAY:
7755                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7756                 /* fall through */
7757         case -NFS4ERR_RETRY_UNCACHED_REP:
7758                 return -EAGAIN;
7759         default:
7760                 nfs4_schedule_lease_recovery(clp);
7761         }
7762         return 0;
7763 }
7764
7765 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7766 {
7767         struct nfs4_reclaim_complete_data *calldata = data;
7768         struct nfs_client *clp = calldata->clp;
7769         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7770
7771         dprintk("--> %s\n", __func__);
7772         if (!nfs41_sequence_done(task, res))
7773                 return;
7774
7775         trace_nfs4_reclaim_complete(clp, task->tk_status);
7776         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7777                 rpc_restart_call_prepare(task);
7778                 return;
7779         }
7780         dprintk("<-- %s\n", __func__);
7781 }
7782
7783 static void nfs4_free_reclaim_complete_data(void *data)
7784 {
7785         struct nfs4_reclaim_complete_data *calldata = data;
7786
7787         kfree(calldata);
7788 }
7789
7790 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7791         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7792         .rpc_call_done = nfs4_reclaim_complete_done,
7793         .rpc_release = nfs4_free_reclaim_complete_data,
7794 };
7795
7796 /*
7797  * Issue a global reclaim complete.
7798  */
7799 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7800                 struct rpc_cred *cred)
7801 {
7802         struct nfs4_reclaim_complete_data *calldata;
7803         struct rpc_task *task;
7804         struct rpc_message msg = {
7805                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7806                 .rpc_cred = cred,
7807         };
7808         struct rpc_task_setup task_setup_data = {
7809                 .rpc_client = clp->cl_rpcclient,
7810                 .rpc_message = &msg,
7811                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7812                 .flags = RPC_TASK_ASYNC,
7813         };
7814         int status = -ENOMEM;
7815
7816         dprintk("--> %s\n", __func__);
7817         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7818         if (calldata == NULL)
7819                 goto out;
7820         calldata->clp = clp;
7821         calldata->arg.one_fs = 0;
7822
7823         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7824         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7825         msg.rpc_argp = &calldata->arg;
7826         msg.rpc_resp = &calldata->res;
7827         task_setup_data.callback_data = calldata;
7828         task = rpc_run_task(&task_setup_data);
7829         if (IS_ERR(task)) {
7830                 status = PTR_ERR(task);
7831                 goto out;
7832         }
7833         status = nfs4_wait_for_completion_rpc_task(task);
7834         if (status == 0)
7835                 status = task->tk_status;
7836         rpc_put_task(task);
7837         return 0;
7838 out:
7839         dprintk("<-- %s status=%d\n", __func__, status);
7840         return status;
7841 }
7842
7843 static void
7844 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7845 {
7846         struct nfs4_layoutget *lgp = calldata;
7847         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7848         struct nfs4_session *session = nfs4_get_session(server);
7849
7850         dprintk("--> %s\n", __func__);
7851         nfs41_setup_sequence(session, &lgp->args.seq_args,
7852                                 &lgp->res.seq_res, task);
7853         dprintk("<-- %s\n", __func__);
7854 }
7855
7856 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7857 {
7858         struct nfs4_layoutget *lgp = calldata;
7859
7860         dprintk("--> %s\n", __func__);
7861         nfs41_sequence_done(task, &lgp->res.seq_res);
7862         dprintk("<-- %s\n", __func__);
7863 }
7864
7865 static int
7866 nfs4_layoutget_handle_exception(struct rpc_task *task,
7867                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
7868 {
7869         struct inode *inode = lgp->args.inode;
7870         struct nfs_server *server = NFS_SERVER(inode);
7871         struct pnfs_layout_hdr *lo;
7872         int status = task->tk_status;
7873
7874         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7875
7876         switch (status) {
7877         case 0:
7878                 goto out;
7879
7880         /*
7881          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
7882          * on the file. set tk_status to -ENODATA to tell upper layer to
7883          * retry go inband.
7884          */
7885         case -NFS4ERR_LAYOUTUNAVAILABLE:
7886                 status = -ENODATA;
7887                 goto out;
7888         /*
7889          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
7890          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
7891          */
7892         case -NFS4ERR_BADLAYOUT:
7893                 status = -EOVERFLOW;
7894                 goto out;
7895         /*
7896          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7897          * (or clients) writing to the same RAID stripe except when
7898          * the minlength argument is 0 (see RFC5661 section 18.43.3).
7899          *
7900          * Treat it like we would RECALLCONFLICT -- we retry for a little
7901          * while, and then eventually give up.
7902          */
7903         case -NFS4ERR_LAYOUTTRYLATER:
7904                 if (lgp->args.minlength == 0) {
7905                         status = -EOVERFLOW;
7906                         goto out;
7907                 }
7908                 /* Fallthrough */
7909         case -NFS4ERR_RECALLCONFLICT:
7910                 nfs4_handle_exception(server, -NFS4ERR_RECALLCONFLICT,
7911                                         exception);
7912                 status = -ERECALLCONFLICT;
7913                 goto out;
7914         case -NFS4ERR_EXPIRED:
7915         case -NFS4ERR_BAD_STATEID:
7916                 exception->timeout = 0;
7917                 spin_lock(&inode->i_lock);
7918                 if (nfs4_stateid_match(&lgp->args.stateid,
7919                                         &lgp->args.ctx->state->stateid)) {
7920                         spin_unlock(&inode->i_lock);
7921                         /* If the open stateid was bad, then recover it. */
7922                         exception->state = lgp->args.ctx->state;
7923                         break;
7924                 }
7925                 lo = NFS_I(inode)->layout;
7926                 if (lo && !test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) &&
7927                     nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
7928                         LIST_HEAD(head);
7929
7930                         /*
7931                          * Mark the bad layout state as invalid, then retry
7932                          * with the current stateid.
7933                          */
7934                         set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
7935                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL, 0);
7936                         spin_unlock(&inode->i_lock);
7937                         pnfs_free_lseg_list(&head);
7938                         status = -EAGAIN;
7939                         goto out;
7940                 } else
7941                         spin_unlock(&inode->i_lock);
7942         }
7943
7944         status = nfs4_handle_exception(server, status, exception);
7945         if (exception->retry)
7946                 status = -EAGAIN;
7947 out:
7948         dprintk("<-- %s\n", __func__);
7949         return status;
7950 }
7951
7952 static size_t max_response_pages(struct nfs_server *server)
7953 {
7954         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7955         return nfs_page_array_len(0, max_resp_sz);
7956 }
7957
7958 static void nfs4_free_pages(struct page **pages, size_t size)
7959 {
7960         int i;
7961
7962         if (!pages)
7963                 return;
7964
7965         for (i = 0; i < size; i++) {
7966                 if (!pages[i])
7967                         break;
7968                 __free_page(pages[i]);
7969         }
7970         kfree(pages);
7971 }
7972
7973 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7974 {
7975         struct page **pages;
7976         int i;
7977
7978         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7979         if (!pages) {
7980                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7981                 return NULL;
7982         }
7983
7984         for (i = 0; i < size; i++) {
7985                 pages[i] = alloc_page(gfp_flags);
7986                 if (!pages[i]) {
7987                         dprintk("%s: failed to allocate page\n", __func__);
7988                         nfs4_free_pages(pages, size);
7989                         return NULL;
7990                 }
7991         }
7992
7993         return pages;
7994 }
7995
7996 static void nfs4_layoutget_release(void *calldata)
7997 {
7998         struct nfs4_layoutget *lgp = calldata;
7999         struct inode *inode = lgp->args.inode;
8000         struct nfs_server *server = NFS_SERVER(inode);
8001         size_t max_pages = max_response_pages(server);
8002
8003         dprintk("--> %s\n", __func__);
8004         nfs4_free_pages(lgp->args.layout.pages, max_pages);
8005         pnfs_put_layout_hdr(NFS_I(inode)->layout);
8006         put_nfs_open_context(lgp->args.ctx);
8007         kfree(calldata);
8008         dprintk("<-- %s\n", __func__);
8009 }
8010
8011 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
8012         .rpc_call_prepare = nfs4_layoutget_prepare,
8013         .rpc_call_done = nfs4_layoutget_done,
8014         .rpc_release = nfs4_layoutget_release,
8015 };
8016
8017 struct pnfs_layout_segment *
8018 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags)
8019 {
8020         struct inode *inode = lgp->args.inode;
8021         struct nfs_server *server = NFS_SERVER(inode);
8022         size_t max_pages = max_response_pages(server);
8023         struct rpc_task *task;
8024         struct rpc_message msg = {
8025                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
8026                 .rpc_argp = &lgp->args,
8027                 .rpc_resp = &lgp->res,
8028                 .rpc_cred = lgp->cred,
8029         };
8030         struct rpc_task_setup task_setup_data = {
8031                 .rpc_client = server->client,
8032                 .rpc_message = &msg,
8033                 .callback_ops = &nfs4_layoutget_call_ops,
8034                 .callback_data = lgp,
8035                 .flags = RPC_TASK_ASYNC,
8036         };
8037         struct pnfs_layout_segment *lseg = NULL;
8038         struct nfs4_exception exception = {
8039                 .inode = inode,
8040                 .timeout = *timeout,
8041         };
8042         int status = 0;
8043
8044         dprintk("--> %s\n", __func__);
8045
8046         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
8047         pnfs_get_layout_hdr(NFS_I(inode)->layout);
8048
8049         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
8050         if (!lgp->args.layout.pages) {
8051                 nfs4_layoutget_release(lgp);
8052                 return ERR_PTR(-ENOMEM);
8053         }
8054         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
8055
8056         lgp->res.layoutp = &lgp->args.layout;
8057         lgp->res.seq_res.sr_slot = NULL;
8058         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
8059
8060         task = rpc_run_task(&task_setup_data);
8061         if (IS_ERR(task))
8062                 return ERR_CAST(task);
8063         status = nfs4_wait_for_completion_rpc_task(task);
8064         if (status == 0) {
8065                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
8066                 *timeout = exception.timeout;
8067         }
8068
8069         trace_nfs4_layoutget(lgp->args.ctx,
8070                         &lgp->args.range,
8071                         &lgp->res.range,
8072                         &lgp->res.stateid,
8073                         status);
8074
8075         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
8076         if (status == 0 && lgp->res.layoutp->len)
8077                 lseg = pnfs_layout_process(lgp);
8078         rpc_put_task(task);
8079         dprintk("<-- %s status=%d\n", __func__, status);
8080         if (status)
8081                 return ERR_PTR(status);
8082         return lseg;
8083 }
8084
8085 static void
8086 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
8087 {
8088         struct nfs4_layoutreturn *lrp = calldata;
8089
8090         dprintk("--> %s\n", __func__);
8091         nfs41_setup_sequence(lrp->clp->cl_session,
8092                         &lrp->args.seq_args,
8093                         &lrp->res.seq_res,
8094                         task);
8095 }
8096
8097 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
8098 {
8099         struct nfs4_layoutreturn *lrp = calldata;
8100         struct nfs_server *server;
8101
8102         dprintk("--> %s\n", __func__);
8103
8104         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
8105                 return;
8106
8107         server = NFS_SERVER(lrp->args.inode);
8108         switch (task->tk_status) {
8109         default:
8110                 task->tk_status = 0;
8111         case 0:
8112                 break;
8113         case -NFS4ERR_DELAY:
8114                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
8115                         break;
8116                 rpc_restart_call_prepare(task);
8117                 return;
8118         }
8119         dprintk("<-- %s\n", __func__);
8120 }
8121
8122 static void nfs4_layoutreturn_release(void *calldata)
8123 {
8124         struct nfs4_layoutreturn *lrp = calldata;
8125         struct pnfs_layout_hdr *lo = lrp->args.layout;
8126         LIST_HEAD(freeme);
8127
8128         dprintk("--> %s\n", __func__);
8129         spin_lock(&lo->plh_inode->i_lock);
8130         pnfs_mark_matching_lsegs_invalid(lo, &freeme, &lrp->args.range,
8131                         be32_to_cpu(lrp->args.stateid.seqid));
8132         pnfs_mark_layout_returned_if_empty(lo);
8133         if (lrp->res.lrs_present)
8134                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
8135         pnfs_clear_layoutreturn_waitbit(lo);
8136         spin_unlock(&lo->plh_inode->i_lock);
8137         pnfs_free_lseg_list(&freeme);
8138         pnfs_put_layout_hdr(lrp->args.layout);
8139         nfs_iput_and_deactive(lrp->inode);
8140         kfree(calldata);
8141         dprintk("<-- %s\n", __func__);
8142 }
8143
8144 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
8145         .rpc_call_prepare = nfs4_layoutreturn_prepare,
8146         .rpc_call_done = nfs4_layoutreturn_done,
8147         .rpc_release = nfs4_layoutreturn_release,
8148 };
8149
8150 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
8151 {
8152         struct rpc_task *task;
8153         struct rpc_message msg = {
8154                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
8155                 .rpc_argp = &lrp->args,
8156                 .rpc_resp = &lrp->res,
8157                 .rpc_cred = lrp->cred,
8158         };
8159         struct rpc_task_setup task_setup_data = {
8160                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
8161                 .rpc_message = &msg,
8162                 .callback_ops = &nfs4_layoutreturn_call_ops,
8163                 .callback_data = lrp,
8164         };
8165         int status = 0;
8166
8167         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
8168                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
8169                         &task_setup_data.rpc_client, &msg);
8170
8171         dprintk("--> %s\n", __func__);
8172         if (!sync) {
8173                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
8174                 if (!lrp->inode) {
8175                         nfs4_layoutreturn_release(lrp);
8176                         return -EAGAIN;
8177                 }
8178                 task_setup_data.flags |= RPC_TASK_ASYNC;
8179         }
8180         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
8181         task = rpc_run_task(&task_setup_data);
8182         if (IS_ERR(task))
8183                 return PTR_ERR(task);
8184         if (sync)
8185                 status = task->tk_status;
8186         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
8187         dprintk("<-- %s status=%d\n", __func__, status);
8188         rpc_put_task(task);
8189         return status;
8190 }
8191
8192 static int
8193 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
8194                 struct pnfs_device *pdev,
8195                 struct rpc_cred *cred)
8196 {
8197         struct nfs4_getdeviceinfo_args args = {
8198                 .pdev = pdev,
8199                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
8200                         NOTIFY_DEVICEID4_DELETE,
8201         };
8202         struct nfs4_getdeviceinfo_res res = {
8203                 .pdev = pdev,
8204         };
8205         struct rpc_message msg = {
8206                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
8207                 .rpc_argp = &args,
8208                 .rpc_resp = &res,
8209                 .rpc_cred = cred,
8210         };
8211         int status;
8212
8213         dprintk("--> %s\n", __func__);
8214         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
8215         if (res.notification & ~args.notify_types)
8216                 dprintk("%s: unsupported notification\n", __func__);
8217         if (res.notification != args.notify_types)
8218                 pdev->nocache = 1;
8219
8220         dprintk("<-- %s status=%d\n", __func__, status);
8221
8222         return status;
8223 }
8224
8225 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
8226                 struct pnfs_device *pdev,
8227                 struct rpc_cred *cred)
8228 {
8229         struct nfs4_exception exception = { };
8230         int err;
8231
8232         do {
8233                 err = nfs4_handle_exception(server,
8234                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
8235                                         &exception);
8236         } while (exception.retry);
8237         return err;
8238 }
8239 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
8240
8241 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
8242 {
8243         struct nfs4_layoutcommit_data *data = calldata;
8244         struct nfs_server *server = NFS_SERVER(data->args.inode);
8245         struct nfs4_session *session = nfs4_get_session(server);
8246
8247         nfs41_setup_sequence(session,
8248                         &data->args.seq_args,
8249                         &data->res.seq_res,
8250                         task);
8251 }
8252
8253 static void
8254 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
8255 {
8256         struct nfs4_layoutcommit_data *data = calldata;
8257         struct nfs_server *server = NFS_SERVER(data->args.inode);
8258
8259         if (!nfs41_sequence_done(task, &data->res.seq_res))
8260                 return;
8261
8262         switch (task->tk_status) { /* Just ignore these failures */
8263         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
8264         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
8265         case -NFS4ERR_BADLAYOUT:     /* no layout */
8266         case -NFS4ERR_GRACE:        /* loca_recalim always false */
8267                 task->tk_status = 0;
8268         case 0:
8269                 break;
8270         default:
8271                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
8272                         rpc_restart_call_prepare(task);
8273                         return;
8274                 }
8275         }
8276 }
8277
8278 static void nfs4_layoutcommit_release(void *calldata)
8279 {
8280         struct nfs4_layoutcommit_data *data = calldata;
8281
8282         pnfs_cleanup_layoutcommit(data);
8283         nfs_post_op_update_inode_force_wcc(data->args.inode,
8284                                            data->res.fattr);
8285         put_rpccred(data->cred);
8286         nfs_iput_and_deactive(data->inode);
8287         kfree(data);
8288 }
8289
8290 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
8291         .rpc_call_prepare = nfs4_layoutcommit_prepare,
8292         .rpc_call_done = nfs4_layoutcommit_done,
8293         .rpc_release = nfs4_layoutcommit_release,
8294 };
8295
8296 int
8297 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
8298 {
8299         struct rpc_message msg = {
8300                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
8301                 .rpc_argp = &data->args,
8302                 .rpc_resp = &data->res,
8303                 .rpc_cred = data->cred,
8304         };
8305         struct rpc_task_setup task_setup_data = {
8306                 .task = &data->task,
8307                 .rpc_client = NFS_CLIENT(data->args.inode),
8308                 .rpc_message = &msg,
8309                 .callback_ops = &nfs4_layoutcommit_ops,
8310                 .callback_data = data,
8311         };
8312         struct rpc_task *task;
8313         int status = 0;
8314
8315         dprintk("NFS: initiating layoutcommit call. sync %d "
8316                 "lbw: %llu inode %lu\n", sync,
8317                 data->args.lastbytewritten,
8318                 data->args.inode->i_ino);
8319
8320         if (!sync) {
8321                 data->inode = nfs_igrab_and_active(data->args.inode);
8322                 if (data->inode == NULL) {
8323                         nfs4_layoutcommit_release(data);
8324                         return -EAGAIN;
8325                 }
8326                 task_setup_data.flags = RPC_TASK_ASYNC;
8327         }
8328         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8329         task = rpc_run_task(&task_setup_data);
8330         if (IS_ERR(task))
8331                 return PTR_ERR(task);
8332         if (sync)
8333                 status = task->tk_status;
8334         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
8335         dprintk("%s: status %d\n", __func__, status);
8336         rpc_put_task(task);
8337         return status;
8338 }
8339
8340 /**
8341  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8342  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8343  */
8344 static int
8345 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8346                     struct nfs_fsinfo *info,
8347                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8348 {
8349         struct nfs41_secinfo_no_name_args args = {
8350                 .style = SECINFO_STYLE_CURRENT_FH,
8351         };
8352         struct nfs4_secinfo_res res = {
8353                 .flavors = flavors,
8354         };
8355         struct rpc_message msg = {
8356                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8357                 .rpc_argp = &args,
8358                 .rpc_resp = &res,
8359         };
8360         struct rpc_clnt *clnt = server->client;
8361         struct rpc_cred *cred = NULL;
8362         int status;
8363
8364         if (use_integrity) {
8365                 clnt = server->nfs_client->cl_rpcclient;
8366                 cred = nfs4_get_clid_cred(server->nfs_client);
8367                 msg.rpc_cred = cred;
8368         }
8369
8370         dprintk("--> %s\n", __func__);
8371         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8372                                 &res.seq_res, 0);
8373         dprintk("<-- %s status=%d\n", __func__, status);
8374
8375         if (cred)
8376                 put_rpccred(cred);
8377
8378         return status;
8379 }
8380
8381 static int
8382 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8383                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8384 {
8385         struct nfs4_exception exception = { };
8386         int err;
8387         do {
8388                 /* first try using integrity protection */
8389                 err = -NFS4ERR_WRONGSEC;
8390
8391                 /* try to use integrity protection with machine cred */
8392                 if (_nfs4_is_integrity_protected(server->nfs_client))
8393                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8394                                                           flavors, true);
8395
8396                 /*
8397                  * if unable to use integrity protection, or SECINFO with
8398                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8399                  * disallowed by spec, but exists in deployed servers) use
8400                  * the current filesystem's rpc_client and the user cred.
8401                  */
8402                 if (err == -NFS4ERR_WRONGSEC)
8403                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8404                                                           flavors, false);
8405
8406                 switch (err) {
8407                 case 0:
8408                 case -NFS4ERR_WRONGSEC:
8409                 case -ENOTSUPP:
8410                         goto out;
8411                 default:
8412                         err = nfs4_handle_exception(server, err, &exception);
8413                 }
8414         } while (exception.retry);
8415 out:
8416         return err;
8417 }
8418
8419 static int
8420 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8421                     struct nfs_fsinfo *info)
8422 {
8423         int err;
8424         struct page *page;
8425         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8426         struct nfs4_secinfo_flavors *flavors;
8427         struct nfs4_secinfo4 *secinfo;
8428         int i;
8429
8430         page = alloc_page(GFP_KERNEL);
8431         if (!page) {
8432                 err = -ENOMEM;
8433                 goto out;
8434         }
8435
8436         flavors = page_address(page);
8437         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8438
8439         /*
8440          * Fall back on "guess and check" method if
8441          * the server doesn't support SECINFO_NO_NAME
8442          */
8443         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8444                 err = nfs4_find_root_sec(server, fhandle, info);
8445                 goto out_freepage;
8446         }
8447         if (err)
8448                 goto out_freepage;
8449
8450         for (i = 0; i < flavors->num_flavors; i++) {
8451                 secinfo = &flavors->flavors[i];
8452
8453                 switch (secinfo->flavor) {
8454                 case RPC_AUTH_NULL:
8455                 case RPC_AUTH_UNIX:
8456                 case RPC_AUTH_GSS:
8457                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8458                                         &secinfo->flavor_info);
8459                         break;
8460                 default:
8461                         flavor = RPC_AUTH_MAXFLAVOR;
8462                         break;
8463                 }
8464
8465                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8466                         flavor = RPC_AUTH_MAXFLAVOR;
8467
8468                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8469                         err = nfs4_lookup_root_sec(server, fhandle,
8470                                                    info, flavor);
8471                         if (!err)
8472                                 break;
8473                 }
8474         }
8475
8476         if (flavor == RPC_AUTH_MAXFLAVOR)
8477                 err = -EPERM;
8478
8479 out_freepage:
8480         put_page(page);
8481         if (err == -EACCES)
8482                 return -EPERM;
8483 out:
8484         return err;
8485 }
8486
8487 static int _nfs41_test_stateid(struct nfs_server *server,
8488                 nfs4_stateid *stateid,
8489                 struct rpc_cred *cred)
8490 {
8491         int status;
8492         struct nfs41_test_stateid_args args = {
8493                 .stateid = stateid,
8494         };
8495         struct nfs41_test_stateid_res res;
8496         struct rpc_message msg = {
8497                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8498                 .rpc_argp = &args,
8499                 .rpc_resp = &res,
8500                 .rpc_cred = cred,
8501         };
8502         struct rpc_clnt *rpc_client = server->client;
8503
8504         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8505                 &rpc_client, &msg);
8506
8507         dprintk("NFS call  test_stateid %p\n", stateid);
8508         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8509         nfs4_set_sequence_privileged(&args.seq_args);
8510         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8511                         &args.seq_args, &res.seq_res);
8512         if (status != NFS_OK) {
8513                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8514                 return status;
8515         }
8516         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8517         return -res.status;
8518 }
8519
8520 /**
8521  * nfs41_test_stateid - perform a TEST_STATEID operation
8522  *
8523  * @server: server / transport on which to perform the operation
8524  * @stateid: state ID to test
8525  * @cred: credential
8526  *
8527  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8528  * Otherwise a negative NFS4ERR value is returned if the operation
8529  * failed or the state ID is not currently valid.
8530  */
8531 static int nfs41_test_stateid(struct nfs_server *server,
8532                 nfs4_stateid *stateid,
8533                 struct rpc_cred *cred)
8534 {
8535         struct nfs4_exception exception = { };
8536         int err;
8537         do {
8538                 err = _nfs41_test_stateid(server, stateid, cred);
8539                 if (err != -NFS4ERR_DELAY)
8540                         break;
8541                 nfs4_handle_exception(server, err, &exception);
8542         } while (exception.retry);
8543         return err;
8544 }
8545
8546 struct nfs_free_stateid_data {
8547         struct nfs_server *server;
8548         struct nfs41_free_stateid_args args;
8549         struct nfs41_free_stateid_res res;
8550 };
8551
8552 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8553 {
8554         struct nfs_free_stateid_data *data = calldata;
8555         nfs41_setup_sequence(nfs4_get_session(data->server),
8556                         &data->args.seq_args,
8557                         &data->res.seq_res,
8558                         task);
8559 }
8560
8561 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8562 {
8563         struct nfs_free_stateid_data *data = calldata;
8564
8565         nfs41_sequence_done(task, &data->res.seq_res);
8566
8567         switch (task->tk_status) {
8568         case -NFS4ERR_DELAY:
8569                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8570                         rpc_restart_call_prepare(task);
8571         }
8572 }
8573
8574 static void nfs41_free_stateid_release(void *calldata)
8575 {
8576         kfree(calldata);
8577 }
8578
8579 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8580         .rpc_call_prepare = nfs41_free_stateid_prepare,
8581         .rpc_call_done = nfs41_free_stateid_done,
8582         .rpc_release = nfs41_free_stateid_release,
8583 };
8584
8585 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8586                 nfs4_stateid *stateid,
8587                 struct rpc_cred *cred,
8588                 bool privileged)
8589 {
8590         struct rpc_message msg = {
8591                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8592                 .rpc_cred = cred,
8593         };
8594         struct rpc_task_setup task_setup = {
8595                 .rpc_client = server->client,
8596                 .rpc_message = &msg,
8597                 .callback_ops = &nfs41_free_stateid_ops,
8598                 .flags = RPC_TASK_ASYNC,
8599         };
8600         struct nfs_free_stateid_data *data;
8601
8602         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8603                 &task_setup.rpc_client, &msg);
8604
8605         dprintk("NFS call  free_stateid %p\n", stateid);
8606         data = kmalloc(sizeof(*data), GFP_NOFS);
8607         if (!data)
8608                 return ERR_PTR(-ENOMEM);
8609         data->server = server;
8610         nfs4_stateid_copy(&data->args.stateid, stateid);
8611
8612         task_setup.callback_data = data;
8613
8614         msg.rpc_argp = &data->args;
8615         msg.rpc_resp = &data->res;
8616         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8617         if (privileged)
8618                 nfs4_set_sequence_privileged(&data->args.seq_args);
8619
8620         return rpc_run_task(&task_setup);
8621 }
8622
8623 /**
8624  * nfs41_free_stateid - perform a FREE_STATEID operation
8625  *
8626  * @server: server / transport on which to perform the operation
8627  * @stateid: state ID to release
8628  * @cred: credential
8629  *
8630  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8631  * negative NFS4ERR value is returned.
8632  */
8633 static int nfs41_free_stateid(struct nfs_server *server,
8634                 nfs4_stateid *stateid,
8635                 struct rpc_cred *cred)
8636 {
8637         struct rpc_task *task;
8638         int ret;
8639
8640         task = _nfs41_free_stateid(server, stateid, cred, true);
8641         if (IS_ERR(task))
8642                 return PTR_ERR(task);
8643         ret = rpc_wait_for_completion_task(task);
8644         if (!ret)
8645                 ret = task->tk_status;
8646         rpc_put_task(task);
8647         return ret;
8648 }
8649
8650 static void
8651 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8652 {
8653         struct rpc_task *task;
8654         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8655
8656         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8657         nfs4_free_lock_state(server, lsp);
8658         if (IS_ERR(task))
8659                 return;
8660         rpc_put_task(task);
8661 }
8662
8663 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8664                 const nfs4_stateid *s2)
8665 {
8666         if (s1->type != s2->type)
8667                 return false;
8668
8669         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8670                 return false;
8671
8672         if (s1->seqid == s2->seqid)
8673                 return true;
8674         if (s1->seqid == 0 || s2->seqid == 0)
8675                 return true;
8676
8677         return false;
8678 }
8679
8680 #endif /* CONFIG_NFS_V4_1 */
8681
8682 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8683                 const nfs4_stateid *s2)
8684 {
8685         return nfs4_stateid_match(s1, s2);
8686 }
8687
8688
8689 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8690         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8691         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8692         .recover_open   = nfs4_open_reclaim,
8693         .recover_lock   = nfs4_lock_reclaim,
8694         .establish_clid = nfs4_init_clientid,
8695         .detect_trunking = nfs40_discover_server_trunking,
8696 };
8697
8698 #if defined(CONFIG_NFS_V4_1)
8699 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8700         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8701         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8702         .recover_open   = nfs4_open_reclaim,
8703         .recover_lock   = nfs4_lock_reclaim,
8704         .establish_clid = nfs41_init_clientid,
8705         .reclaim_complete = nfs41_proc_reclaim_complete,
8706         .detect_trunking = nfs41_discover_server_trunking,
8707 };
8708 #endif /* CONFIG_NFS_V4_1 */
8709
8710 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8711         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8712         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8713         .recover_open   = nfs40_open_expired,
8714         .recover_lock   = nfs4_lock_expired,
8715         .establish_clid = nfs4_init_clientid,
8716 };
8717
8718 #if defined(CONFIG_NFS_V4_1)
8719 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8720         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8721         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8722         .recover_open   = nfs41_open_expired,
8723         .recover_lock   = nfs41_lock_expired,
8724         .establish_clid = nfs41_init_clientid,
8725 };
8726 #endif /* CONFIG_NFS_V4_1 */
8727
8728 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8729         .sched_state_renewal = nfs4_proc_async_renew,
8730         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8731         .renew_lease = nfs4_proc_renew,
8732 };
8733
8734 #if defined(CONFIG_NFS_V4_1)
8735 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8736         .sched_state_renewal = nfs41_proc_async_sequence,
8737         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8738         .renew_lease = nfs4_proc_sequence,
8739 };
8740 #endif
8741
8742 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8743         .get_locations = _nfs40_proc_get_locations,
8744         .fsid_present = _nfs40_proc_fsid_present,
8745 };
8746
8747 #if defined(CONFIG_NFS_V4_1)
8748 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8749         .get_locations = _nfs41_proc_get_locations,
8750         .fsid_present = _nfs41_proc_fsid_present,
8751 };
8752 #endif  /* CONFIG_NFS_V4_1 */
8753
8754 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8755         .minor_version = 0,
8756         .init_caps = NFS_CAP_READDIRPLUS
8757                 | NFS_CAP_ATOMIC_OPEN
8758                 | NFS_CAP_POSIX_LOCK,
8759         .init_client = nfs40_init_client,
8760         .shutdown_client = nfs40_shutdown_client,
8761         .match_stateid = nfs4_match_stateid,
8762         .find_root_sec = nfs4_find_root_sec,
8763         .free_lock_state = nfs4_release_lockowner,
8764         .alloc_seqid = nfs_alloc_seqid,
8765         .call_sync_ops = &nfs40_call_sync_ops,
8766         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8767         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8768         .state_renewal_ops = &nfs40_state_renewal_ops,
8769         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8770 };
8771
8772 #if defined(CONFIG_NFS_V4_1)
8773 static struct nfs_seqid *
8774 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
8775 {
8776         return NULL;
8777 }
8778
8779 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8780         .minor_version = 1,
8781         .init_caps = NFS_CAP_READDIRPLUS
8782                 | NFS_CAP_ATOMIC_OPEN
8783                 | NFS_CAP_POSIX_LOCK
8784                 | NFS_CAP_STATEID_NFSV41
8785                 | NFS_CAP_ATOMIC_OPEN_V1,
8786         .init_client = nfs41_init_client,
8787         .shutdown_client = nfs41_shutdown_client,
8788         .match_stateid = nfs41_match_stateid,
8789         .find_root_sec = nfs41_find_root_sec,
8790         .free_lock_state = nfs41_free_lock_state,
8791         .alloc_seqid = nfs_alloc_no_seqid,
8792         .call_sync_ops = &nfs41_call_sync_ops,
8793         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8794         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8795         .state_renewal_ops = &nfs41_state_renewal_ops,
8796         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8797 };
8798 #endif
8799
8800 #if defined(CONFIG_NFS_V4_2)
8801 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8802         .minor_version = 2,
8803         .init_caps = NFS_CAP_READDIRPLUS
8804                 | NFS_CAP_ATOMIC_OPEN
8805                 | NFS_CAP_POSIX_LOCK
8806                 | NFS_CAP_STATEID_NFSV41
8807                 | NFS_CAP_ATOMIC_OPEN_V1
8808                 | NFS_CAP_ALLOCATE
8809                 | NFS_CAP_COPY
8810                 | NFS_CAP_DEALLOCATE
8811                 | NFS_CAP_SEEK
8812                 | NFS_CAP_LAYOUTSTATS
8813                 | NFS_CAP_CLONE,
8814         .init_client = nfs41_init_client,
8815         .shutdown_client = nfs41_shutdown_client,
8816         .match_stateid = nfs41_match_stateid,
8817         .find_root_sec = nfs41_find_root_sec,
8818         .free_lock_state = nfs41_free_lock_state,
8819         .call_sync_ops = &nfs41_call_sync_ops,
8820         .alloc_seqid = nfs_alloc_no_seqid,
8821         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8822         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8823         .state_renewal_ops = &nfs41_state_renewal_ops,
8824         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8825 };
8826 #endif
8827
8828 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8829         [0] = &nfs_v4_0_minor_ops,
8830 #if defined(CONFIG_NFS_V4_1)
8831         [1] = &nfs_v4_1_minor_ops,
8832 #endif
8833 #if defined(CONFIG_NFS_V4_2)
8834         [2] = &nfs_v4_2_minor_ops,
8835 #endif
8836 };
8837
8838 ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
8839 {
8840         ssize_t error, error2;
8841
8842         error = generic_listxattr(dentry, list, size);
8843         if (error < 0)
8844                 return error;
8845         if (list) {
8846                 list += error;
8847                 size -= error;
8848         }
8849
8850         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
8851         if (error2 < 0)
8852                 return error2;
8853         return error + error2;
8854 }
8855
8856 static const struct inode_operations nfs4_dir_inode_operations = {
8857         .create         = nfs_create,
8858         .lookup         = nfs_lookup,
8859         .atomic_open    = nfs_atomic_open,
8860         .link           = nfs_link,
8861         .unlink         = nfs_unlink,
8862         .symlink        = nfs_symlink,
8863         .mkdir          = nfs_mkdir,
8864         .rmdir          = nfs_rmdir,
8865         .mknod          = nfs_mknod,
8866         .rename         = nfs_rename,
8867         .permission     = nfs_permission,
8868         .getattr        = nfs_getattr,
8869         .setattr        = nfs_setattr,
8870         .getxattr       = generic_getxattr,
8871         .setxattr       = generic_setxattr,
8872         .listxattr      = nfs4_listxattr,
8873         .removexattr    = generic_removexattr,
8874 };
8875
8876 static const struct inode_operations nfs4_file_inode_operations = {
8877         .permission     = nfs_permission,
8878         .getattr        = nfs_getattr,
8879         .setattr        = nfs_setattr,
8880         .getxattr       = generic_getxattr,
8881         .setxattr       = generic_setxattr,
8882         .listxattr      = nfs4_listxattr,
8883         .removexattr    = generic_removexattr,
8884 };
8885
8886 const struct nfs_rpc_ops nfs_v4_clientops = {
8887         .version        = 4,                    /* protocol version */
8888         .dentry_ops     = &nfs4_dentry_operations,
8889         .dir_inode_ops  = &nfs4_dir_inode_operations,
8890         .file_inode_ops = &nfs4_file_inode_operations,
8891         .file_ops       = &nfs4_file_operations,
8892         .getroot        = nfs4_proc_get_root,
8893         .submount       = nfs4_submount,
8894         .try_mount      = nfs4_try_mount,
8895         .getattr        = nfs4_proc_getattr,
8896         .setattr        = nfs4_proc_setattr,
8897         .lookup         = nfs4_proc_lookup,
8898         .access         = nfs4_proc_access,
8899         .readlink       = nfs4_proc_readlink,
8900         .create         = nfs4_proc_create,
8901         .remove         = nfs4_proc_remove,
8902         .unlink_setup   = nfs4_proc_unlink_setup,
8903         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8904         .unlink_done    = nfs4_proc_unlink_done,
8905         .rename_setup   = nfs4_proc_rename_setup,
8906         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8907         .rename_done    = nfs4_proc_rename_done,
8908         .link           = nfs4_proc_link,
8909         .symlink        = nfs4_proc_symlink,
8910         .mkdir          = nfs4_proc_mkdir,
8911         .rmdir          = nfs4_proc_remove,
8912         .readdir        = nfs4_proc_readdir,
8913         .mknod          = nfs4_proc_mknod,
8914         .statfs         = nfs4_proc_statfs,
8915         .fsinfo         = nfs4_proc_fsinfo,
8916         .pathconf       = nfs4_proc_pathconf,
8917         .set_capabilities = nfs4_server_capabilities,
8918         .decode_dirent  = nfs4_decode_dirent,
8919         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8920         .read_setup     = nfs4_proc_read_setup,
8921         .read_done      = nfs4_read_done,
8922         .write_setup    = nfs4_proc_write_setup,
8923         .write_done     = nfs4_write_done,
8924         .commit_setup   = nfs4_proc_commit_setup,
8925         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8926         .commit_done    = nfs4_commit_done,
8927         .lock           = nfs4_proc_lock,
8928         .clear_acl_cache = nfs4_zap_acl_attr,
8929         .close_context  = nfs4_close_context,
8930         .open_context   = nfs4_atomic_open,
8931         .have_delegation = nfs4_have_delegation,
8932         .return_delegation = nfs4_inode_return_delegation,
8933         .alloc_client   = nfs4_alloc_client,
8934         .init_client    = nfs4_init_client,
8935         .free_client    = nfs4_free_client,
8936         .create_server  = nfs4_create_server,
8937         .clone_server   = nfs_clone_server,
8938 };
8939
8940 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8941         .name   = XATTR_NAME_NFSV4_ACL,
8942         .list   = nfs4_xattr_list_nfs4_acl,
8943         .get    = nfs4_xattr_get_nfs4_acl,
8944         .set    = nfs4_xattr_set_nfs4_acl,
8945 };
8946
8947 const struct xattr_handler *nfs4_xattr_handlers[] = {
8948         &nfs4_xattr_nfs4_acl_handler,
8949 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8950         &nfs4_xattr_nfs4_label_handler,
8951 #endif
8952         NULL
8953 };
8954
8955 /*
8956  * Local variables:
8957  *  c-basic-offset: 8
8958  * End:
8959  */