fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.h>
  55 #include <linux/sunrpc/bc_xprt.h>
  56 #include <linux/xattr.h>
  57 #include <linux/utsname.h>
  58 #include <linux/freezer.h>
  59
  60 #include "nfs4_fs.h"
  61 #include "delegation.h"
  62 #include "internal.h"
  63 #include "iostat.h"
  64 #include "callback.h"
  65 #include "pnfs.h"
  66 #include "netns.h"
  67
  68 #define NFSDBG_FACILITY         NFSDBG_PROC
  69
  70 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  71 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  72
  73 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  74
  75 struct nfs4_opendata;
  76 static int _nfs4_proc_open(struct nfs4_opendata *data);
  77 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  78 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  79 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  80 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  81 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
  82 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  83 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  84                             struct nfs_fattr *fattr, struct iattr *sattr,
  85                             struct nfs4_state *state);
  86 #ifdef CONFIG_NFS_V4_1
  87 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  88 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  89 #endif
  90 /* Prevent leaks of NFSv4 errors into userland */
  91 static int nfs4_map_errors(int err)
  92 {
  93         if (err >= -1000)
  94                 return err;
  95         switch (err) {
  96         case -NFS4ERR_RESOURCE:
  97                 return -EREMOTEIO;
  98         case -NFS4ERR_WRONGSEC:
  99                 return -EPERM;
 100         case -NFS4ERR_BADOWNER:
 101         case -NFS4ERR_BADNAME:
 102                 return -EINVAL;
 103         case -NFS4ERR_SHARE_DENIED:
 104                 return -EACCES;
 105         case -NFS4ERR_MINOR_VERS_MISMATCH:
 106                 return -EPROTONOSUPPORT;
 107         case -NFS4ERR_ACCESS:
 108                 return -EACCES;
 109         default:
 110                 dprintk("%s could not handle NFSv4 error %d\n",
 111                                 __func__, -err);
 112                 break;
 113         }
 114         return -EIO;
 115 }
 116
 117 /*
 118  * This is our standard bitmap for GETATTR requests.
 119  */
 120 const u32 nfs4_fattr_bitmap[3] = {
 121         FATTR4_WORD0_TYPE
 122         | FATTR4_WORD0_CHANGE
 123         | FATTR4_WORD0_SIZE
 124         | FATTR4_WORD0_FSID
 125         | FATTR4_WORD0_FILEID,
 126         FATTR4_WORD1_MODE
 127         | FATTR4_WORD1_NUMLINKS
 128         | FATTR4_WORD1_OWNER
 129         | FATTR4_WORD1_OWNER_GROUP
 130         | FATTR4_WORD1_RAWDEV
 131         | FATTR4_WORD1_SPACE_USED
 132         | FATTR4_WORD1_TIME_ACCESS
 133         | FATTR4_WORD1_TIME_METADATA
 134         | FATTR4_WORD1_TIME_MODIFY
 135 };
 136
 137 static const u32 nfs4_pnfs_open_bitmap[3] = {
 138         FATTR4_WORD0_TYPE
 139         | FATTR4_WORD0_CHANGE
 140         | FATTR4_WORD0_SIZE
 141         | FATTR4_WORD0_FSID
 142         | FATTR4_WORD0_FILEID,
 143         FATTR4_WORD1_MODE
 144         | FATTR4_WORD1_NUMLINKS
 145         | FATTR4_WORD1_OWNER
 146         | FATTR4_WORD1_OWNER_GROUP
 147         | FATTR4_WORD1_RAWDEV
 148         | FATTR4_WORD1_SPACE_USED
 149         | FATTR4_WORD1_TIME_ACCESS
 150         | FATTR4_WORD1_TIME_METADATA
 151         | FATTR4_WORD1_TIME_MODIFY,
 152         FATTR4_WORD2_MDSTHRESHOLD
 153 };
 154
 155 static const u32 nfs4_open_noattr_bitmap[3] = {
 156         FATTR4_WORD0_TYPE
 157         | FATTR4_WORD0_CHANGE
 158         | FATTR4_WORD0_FILEID,
 159 };
 160
 161 const u32 nfs4_statfs_bitmap[2] = {
 162         FATTR4_WORD0_FILES_AVAIL
 163         | FATTR4_WORD0_FILES_FREE
 164         | FATTR4_WORD0_FILES_TOTAL,
 165         FATTR4_WORD1_SPACE_AVAIL
 166         | FATTR4_WORD1_SPACE_FREE
 167         | FATTR4_WORD1_SPACE_TOTAL
 168 };
 169
 170 const u32 nfs4_pathconf_bitmap[2] = {
 171         FATTR4_WORD0_MAXLINK
 172         | FATTR4_WORD0_MAXNAME,
 173         0
 174 };
 175
 176 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 177                         | FATTR4_WORD0_MAXREAD
 178                         | FATTR4_WORD0_MAXWRITE
 179                         | FATTR4_WORD0_LEASE_TIME,
 180                         FATTR4_WORD1_TIME_DELTA
 181                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 182                         FATTR4_WORD2_LAYOUT_BLKSIZE
 183 };
 184
 185 const u32 nfs4_fs_locations_bitmap[2] = {
 186         FATTR4_WORD0_TYPE
 187         | FATTR4_WORD0_CHANGE
 188         | FATTR4_WORD0_SIZE
 189         | FATTR4_WORD0_FSID
 190         | FATTR4_WORD0_FILEID
 191         | FATTR4_WORD0_FS_LOCATIONS,
 192         FATTR4_WORD1_MODE
 193         | FATTR4_WORD1_NUMLINKS
 194         | FATTR4_WORD1_OWNER
 195         | FATTR4_WORD1_OWNER_GROUP
 196         | FATTR4_WORD1_RAWDEV
 197         | FATTR4_WORD1_SPACE_USED
 198         | FATTR4_WORD1_TIME_ACCESS
 199         | FATTR4_WORD1_TIME_METADATA
 200         | FATTR4_WORD1_TIME_MODIFY
 201         | FATTR4_WORD1_MOUNTED_ON_FILEID
 202 };
 203
 204 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 205                 struct nfs4_readdir_arg *readdir)
 206 {
 207         __be32 *start, *p;
 208
 209         BUG_ON(readdir->count < 80);
 210         if (cookie > 2) {
 211                 readdir->cookie = cookie;
 212                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 213                 return;
 214         }
 215
 216         readdir->cookie = 0;
 217         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 218         if (cookie == 2)
 219                 return;
 220
 221         /*
 222          * NFSv4 servers do not return entries for '.' and '..'
 223          * Therefore, we fake these entries here.  We let '.'
 224          * have cookie 0 and '..' have cookie 1.  Note that
 225          * when talking to the server, we always send cookie 0
 226          * instead of 1 or 2.
 227          */
 228         start = p = kmap_atomic(*readdir->pages);
 229
 230         if (cookie == 0) {
 231                 *p++ = xdr_one;                                  /* next */
 232                 *p++ = xdr_zero;                   /* cookie, first word */
 233                 *p++ = xdr_one;                   /* cookie, second word */
 234                 *p++ = xdr_one;                             /* entry len */
 235                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 236                 p++;
 237                 *p++ = xdr_one;                         /* bitmap length */
 238                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 239                 *p++ = htonl(8);              /* attribute buffer length */
 240                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 241         }
 242
 243         *p++ = xdr_one;                                  /* next */
 244         *p++ = xdr_zero;                   /* cookie, first word */
 245         *p++ = xdr_two;                   /* cookie, second word */
 246         *p++ = xdr_two;                             /* entry len */
 247         memcpy(p, "..\0\0", 4);                         /* entry */
 248         p++;
 249         *p++ = xdr_one;                         /* bitmap length */
 250         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 251         *p++ = htonl(8);              /* attribute buffer length */
 252         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 253
 254         readdir->pgbase = (char *)p - (char *)start;
 255         readdir->count -= readdir->pgbase;
 256         kunmap_atomic(start);
 257 }
 258
 259 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 260 {
 261         int res;
 262
 263         might_sleep();
 264
 265         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 266                         nfs_wait_bit_killable, TASK_KILLABLE);
 267         if (res)
 268                 return res;
 269
 270         if (clp->cl_cons_state < 0)
 271                 return clp->cl_cons_state;
 272         return 0;
 273 }
 274
 275 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 276 {
 277         int res = 0;
 278
 279         might_sleep();
 280
 281         if (*timeout <= 0)
 282                 *timeout = NFS4_POLL_RETRY_MIN;
 283         if (*timeout > NFS4_POLL_RETRY_MAX)
 284                 *timeout = NFS4_POLL_RETRY_MAX;
 285         freezable_schedule_timeout_killable(*timeout);
 286         if (fatal_signal_pending(current))
 287                 res = -ERESTARTSYS;
 288         *timeout <<= 1;
 289         return res;
 290 }
 291
 292 /* This is the error handling routine for processes that are allowed
 293  * to sleep.
 294  */
 295 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 296 {
 297         struct nfs_client *clp = server->nfs_client;
 298         struct nfs4_state *state = exception->state;
 299         struct inode *inode = exception->inode;
 300         int ret = errorcode;
 301
 302         exception->retry = 0;
 303         switch(errorcode) {
 304                 case 0:
 305                         return 0;
 306                 case -NFS4ERR_OPENMODE:
 307                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 308                                 nfs4_inode_return_delegation(inode);
 309                                 exception->retry = 1;
 310                                 return 0;
 311                         }
 312                         if (state == NULL)
 313                                 break;
 314                         nfs4_schedule_stateid_recovery(server, state);
 315                         goto wait_on_recovery;
 316                 case -NFS4ERR_DELEG_REVOKED:
 317                 case -NFS4ERR_ADMIN_REVOKED:
 318                 case -NFS4ERR_BAD_STATEID:
 319                         if (state == NULL)
 320                                 break;
 321                         nfs_remove_bad_delegation(state->inode);
 322                         nfs4_schedule_stateid_recovery(server, state);
 323                         goto wait_on_recovery;
 324                 case -NFS4ERR_EXPIRED:
 325                         if (state != NULL)
 326                                 nfs4_schedule_stateid_recovery(server, state);
 327                 case -NFS4ERR_STALE_STATEID:
 328                 case -NFS4ERR_STALE_CLIENTID:
 329                         nfs4_schedule_lease_recovery(clp);
 330                         goto wait_on_recovery;
 331 #if defined(CONFIG_NFS_V4_1)
 332                 case -NFS4ERR_BADSESSION:
 333                 case -NFS4ERR_BADSLOT:
 334                 case -NFS4ERR_BAD_HIGH_SLOT:
 335                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 336                 case -NFS4ERR_DEADSESSION:
 337                 case -NFS4ERR_SEQ_FALSE_RETRY:
 338                 case -NFS4ERR_SEQ_MISORDERED:
 339                         dprintk("%s ERROR: %d Reset session\n", __func__,
 340                                 errorcode);
 341                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 342                         goto wait_on_recovery;
 343 #endif /* defined(CONFIG_NFS_V4_1) */
 344                 case -NFS4ERR_FILE_OPEN:
 345                         if (exception->timeout > HZ) {
 346                                 /* We have retried a decent amount, time to
 347                                  * fail
 348                                  */
 349                                 ret = -EBUSY;
 350                                 break;
 351                         }
 352                 case -NFS4ERR_GRACE:
 353                 case -NFS4ERR_DELAY:
 354                 case -EKEYEXPIRED:
 355                         ret = nfs4_delay(server->client, &exception->timeout);
 356                         if (ret != 0)
 357                                 break;
 358                 case -NFS4ERR_RETRY_UNCACHED_REP:
 359                 case -NFS4ERR_OLD_STATEID:
 360                         exception->retry = 1;
 361                         break;
 362                 case -NFS4ERR_BADOWNER:
 363                         /* The following works around a Linux server bug! */
 364                 case -NFS4ERR_BADNAME:
 365                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 366                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 367                                 exception->retry = 1;
 368                                 printk(KERN_WARNING "NFS: v4 server %s "
 369                                                 "does not accept raw "
 370                                                 "uid/gids. "
 371                                                 "Reenabling the idmapper.\n",
 372                                                 server->nfs_client->cl_hostname);
 373                         }
 374         }
 375         /* We failed to handle the error */
 376         return nfs4_map_errors(ret);
 377 wait_on_recovery:
 378         ret = nfs4_wait_clnt_recover(clp);
 379         if (ret == 0)
 380                 exception->retry = 1;
 381         return ret;
 382 }
 383
 384
 385 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 386 {
 387         spin_lock(&clp->cl_lock);
 388         if (time_before(clp->cl_last_renewal,timestamp))
 389                 clp->cl_last_renewal = timestamp;
 390         spin_unlock(&clp->cl_lock);
 391 }
 392
 393 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 394 {
 395         do_renew_lease(server->nfs_client, timestamp);
 396 }
 397
 398 #if defined(CONFIG_NFS_V4_1)
 399
 400 /*
 401  * nfs4_free_slot - free a slot and efficiently update slot table.
 402  *
 403  * freeing a slot is trivially done by clearing its respective bit
 404  * in the bitmap.
 405  * If the freed slotid equals highest_used_slotid we want to update it
 406  * so that the server would be able to size down the slot table if needed,
 407  * otherwise we know that the highest_used_slotid is still in use.
 408  * When updating highest_used_slotid there may be "holes" in the bitmap
 409  * so we need to scan down from highest_used_slotid to 0 looking for the now
 410  * highest slotid in use.
 411  * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
 412  *
 413  * Must be called while holding tbl->slot_tbl_lock
 414  */
 415 static void
 416 nfs4_free_slot(struct nfs4_slot_table *tbl, u32 slotid)
 417 {
 418         BUG_ON(slotid >= NFS4_MAX_SLOT_TABLE);
 419         /* clear used bit in bitmap */
 420         __clear_bit(slotid, tbl->used_slots);
 421
 422         /* update highest_used_slotid when it is freed */
 423         if (slotid == tbl->highest_used_slotid) {
 424                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 425                 if (slotid < tbl->max_slots)
 426                         tbl->highest_used_slotid = slotid;
 427                 else
 428                         tbl->highest_used_slotid = NFS4_NO_SLOT;
 429         }
 430         dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
 431                 slotid, tbl->highest_used_slotid);
 432 }
 433
 434 bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
 435 {
 436         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 437         return true;
 438 }
 439
 440 /*
 441  * Signal state manager thread if session fore channel is drained
 442  */
 443 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 444 {
 445         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 446                 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
 447                                 nfs4_set_task_privileged, NULL);
 448                 return;
 449         }
 450
 451         if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 452                 return;
 453
 454         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 455         complete(&ses->fc_slot_table.complete);
 456 }
 457
 458 /*
 459  * Signal state manager thread if session back channel is drained
 460  */
 461 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 462 {
 463         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 464             ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 465                 return;
 466         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 467         complete(&ses->bc_slot_table.complete);
 468 }
 469
 470 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 471 {
 472         struct nfs4_slot_table *tbl;
 473
 474         tbl = &res->sr_session->fc_slot_table;
 475         if (!res->sr_slot) {
 476                 /* just wake up the next guy waiting since
 477                  * we may have not consumed a slot after all */
 478                 dprintk("%s: No slot\n", __func__);
 479                 return;
 480         }
 481
 482         spin_lock(&tbl->slot_tbl_lock);
 483         nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
 484         nfs4_check_drain_fc_complete(res->sr_session);
 485         spin_unlock(&tbl->slot_tbl_lock);
 486         res->sr_slot = NULL;
 487 }
 488
 489 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 490 {
 491         unsigned long timestamp;
 492         struct nfs_client *clp;
 493
 494         /*
 495          * sr_status remains 1 if an RPC level error occurred. The server
 496          * may or may not have processed the sequence operation..
 497          * Proceed as if the server received and processed the sequence
 498          * operation.
 499          */
 500         if (res->sr_status == 1)
 501                 res->sr_status = NFS_OK;
 502
 503         /* don't increment the sequence number if the task wasn't sent */
 504         if (!RPC_WAS_SENT(task))
 505                 goto out;
 506
 507         /* Check the SEQUENCE operation status */
 508         switch (res->sr_status) {
 509         case 0:
 510                 /* Update the slot's sequence and clientid lease timer */
 511                 ++res->sr_slot->seq_nr;
 512                 timestamp = res->sr_renewal_time;
 513                 clp = res->sr_session->clp;
 514                 do_renew_lease(clp, timestamp);
 515                 /* Check sequence flags */
 516                 if (res->sr_status_flags != 0)
 517                         nfs4_schedule_lease_recovery(clp);
 518                 break;
 519         case -NFS4ERR_DELAY:
 520                 /* The server detected a resend of the RPC call and
 521                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 522                  * of RFC5661.
 523                  */
 524                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 525                         __func__,
 526                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 527                         res->sr_slot->seq_nr);
 528                 goto out_retry;
 529         default:
 530                 /* Just update the slot sequence no. */
 531                 ++res->sr_slot->seq_nr;
 532         }
 533 out:
 534         /* The session may be reset by one of the error handlers. */
 535         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 536         nfs41_sequence_free_slot(res);
 537         return 1;
 538 out_retry:
 539         if (!rpc_restart_call(task))
 540                 goto out;
 541         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 542         return 0;
 543 }
 544
 545 static int nfs4_sequence_done(struct rpc_task *task,
 546                                struct nfs4_sequence_res *res)
 547 {
 548         if (res->sr_session == NULL)
 549                 return 1;
 550         return nfs41_sequence_done(task, res);
 551 }
 552
 553 /*
 554  * nfs4_find_slot - efficiently look for a free slot
 555  *
 556  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 557  * If found, we mark the slot as used, update the highest_used_slotid,
 558  * and respectively set up the sequence operation args.
 559  * The slot number is returned if found, or NFS4_NO_SLOT otherwise.
 560  *
 561  * Note: must be called with under the slot_tbl_lock.
 562  */
 563 static u32
 564 nfs4_find_slot(struct nfs4_slot_table *tbl)
 565 {
 566         u32 slotid;
 567         u32 ret_id = NFS4_NO_SLOT;
 568
 569         dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
 570                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 571                 tbl->max_slots);
 572         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 573         if (slotid >= tbl->max_slots)
 574                 goto out;
 575         __set_bit(slotid, tbl->used_slots);
 576         if (slotid > tbl->highest_used_slotid ||
 577                         tbl->highest_used_slotid == NFS4_NO_SLOT)
 578                 tbl->highest_used_slotid = slotid;
 579         ret_id = slotid;
 580 out:
 581         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 582                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 583         return ret_id;
 584 }
 585
 586 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 587                 struct nfs4_sequence_res *res, int cache_reply)
 588 {
 589         args->sa_session = NULL;
 590         args->sa_cache_this = 0;
 591         if (cache_reply)
 592                 args->sa_cache_this = 1;
 593         res->sr_session = NULL;
 594         res->sr_slot = NULL;
 595 }
 596
 597 int nfs41_setup_sequence(struct nfs4_session *session,
 598                                 struct nfs4_sequence_args *args,
 599                                 struct nfs4_sequence_res *res,
 600                                 struct rpc_task *task)
 601 {
 602         struct nfs4_slot *slot;
 603         struct nfs4_slot_table *tbl;
 604         u32 slotid;
 605
 606         dprintk("--> %s\n", __func__);
 607         /* slot already allocated? */
 608         if (res->sr_slot != NULL)
 609                 return 0;
 610
 611         tbl = &session->fc_slot_table;
 612
 613         spin_lock(&tbl->slot_tbl_lock);
 614         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 615             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 616                 /* The state manager will wait until the slot table is empty */
 617                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 618                 spin_unlock(&tbl->slot_tbl_lock);
 619                 dprintk("%s session is draining\n", __func__);
 620                 return -EAGAIN;
 621         }
 622
 623         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 624             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 625                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 626                 spin_unlock(&tbl->slot_tbl_lock);
 627                 dprintk("%s enforce FIFO order\n", __func__);
 628                 return -EAGAIN;
 629         }
 630
 631         slotid = nfs4_find_slot(tbl);
 632         if (slotid == NFS4_NO_SLOT) {
 633                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 634                 spin_unlock(&tbl->slot_tbl_lock);
 635                 dprintk("<-- %s: no free slots\n", __func__);
 636                 return -EAGAIN;
 637         }
 638         spin_unlock(&tbl->slot_tbl_lock);
 639
 640         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 641         slot = tbl->slots + slotid;
 642         args->sa_session = session;
 643         args->sa_slotid = slotid;
 644
 645         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 646
 647         res->sr_session = session;
 648         res->sr_slot = slot;
 649         res->sr_renewal_time = jiffies;
 650         res->sr_status_flags = 0;
 651         /*
 652          * sr_status is only set in decode_sequence, and so will remain
 653          * set to 1 if an rpc level failure occurs.
 654          */
 655         res->sr_status = 1;
 656         return 0;
 657 }
 658 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 659
 660 int nfs4_setup_sequence(const struct nfs_server *server,
 661                         struct nfs4_sequence_args *args,
 662                         struct nfs4_sequence_res *res,
 663                         struct rpc_task *task)
 664 {
 665         struct nfs4_session *session = nfs4_get_session(server);
 666         int ret = 0;
 667
 668         if (session == NULL)
 669                 goto out;
 670
 671         dprintk("--> %s clp %p session %p sr_slot %td\n",
 672                 __func__, session->clp, session, res->sr_slot ?
 673                         res->sr_slot - session->fc_slot_table.slots : -1);
 674
 675         ret = nfs41_setup_sequence(session, args, res, task);
 676 out:
 677         dprintk("<-- %s status=%d\n", __func__, ret);
 678         return ret;
 679 }
 680
 681 struct nfs41_call_sync_data {
 682         const struct nfs_server *seq_server;
 683         struct nfs4_sequence_args *seq_args;
 684         struct nfs4_sequence_res *seq_res;
 685 };
 686
 687 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 688 {
 689         struct nfs41_call_sync_data *data = calldata;
 690
 691         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 692
 693         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 694                                 data->seq_res, task))
 695                 return;
 696         rpc_call_start(task);
 697 }
 698
 699 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 700 {
 701         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 702         nfs41_call_sync_prepare(task, calldata);
 703 }
 704
 705 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 706 {
 707         struct nfs41_call_sync_data *data = calldata;
 708
 709         nfs41_sequence_done(task, data->seq_res);
 710 }
 711
 712 static const struct rpc_call_ops nfs41_call_sync_ops = {
 713         .rpc_call_prepare = nfs41_call_sync_prepare,
 714         .rpc_call_done = nfs41_call_sync_done,
 715 };
 716
 717 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 718         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 719         .rpc_call_done = nfs41_call_sync_done,
 720 };
 721
 722 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 723                                    struct nfs_server *server,
 724                                    struct rpc_message *msg,
 725                                    struct nfs4_sequence_args *args,
 726                                    struct nfs4_sequence_res *res,
 727                                    int privileged)
 728 {
 729         int ret;
 730         struct rpc_task *task;
 731         struct nfs41_call_sync_data data = {
 732                 .seq_server = server,
 733                 .seq_args = args,
 734                 .seq_res = res,
 735         };
 736         struct rpc_task_setup task_setup = {
 737                 .rpc_client = clnt,
 738                 .rpc_message = msg,
 739                 .callback_ops = &nfs41_call_sync_ops,
 740                 .callback_data = &data
 741         };
 742
 743         if (privileged)
 744                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 745         task = rpc_run_task(&task_setup);
 746         if (IS_ERR(task))
 747                 ret = PTR_ERR(task);
 748         else {
 749                 ret = task->tk_status;
 750                 rpc_put_task(task);
 751         }
 752         return ret;
 753 }
 754
 755 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 756                             struct nfs_server *server,
 757                             struct rpc_message *msg,
 758                             struct nfs4_sequence_args *args,
 759                             struct nfs4_sequence_res *res,
 760                             int cache_reply)
 761 {
 762         nfs41_init_sequence(args, res, cache_reply);
 763         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 764 }
 765
 766 #else
 767 static inline
 768 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 769                 struct nfs4_sequence_res *res, int cache_reply)
 770 {
 771 }
 772
 773 static int nfs4_sequence_done(struct rpc_task *task,
 774                                struct nfs4_sequence_res *res)
 775 {
 776         return 1;
 777 }
 778 #endif /* CONFIG_NFS_V4_1 */
 779
 780 int _nfs4_call_sync(struct rpc_clnt *clnt,
 781                     struct nfs_server *server,
 782                     struct rpc_message *msg,
 783                     struct nfs4_sequence_args *args,
 784                     struct nfs4_sequence_res *res,
 785                     int cache_reply)
 786 {
 787         nfs41_init_sequence(args, res, cache_reply);
 788         return rpc_call_sync(clnt, msg, 0);
 789 }
 790
 791 static inline
 792 int nfs4_call_sync(struct rpc_clnt *clnt,
 793                    struct nfs_server *server,
 794                    struct rpc_message *msg,
 795                    struct nfs4_sequence_args *args,
 796                    struct nfs4_sequence_res *res,
 797                    int cache_reply)
 798 {
 799         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 800                                                 args, res, cache_reply);
 801 }
 802
 803 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 804 {
 805         struct nfs_inode *nfsi = NFS_I(dir);
 806
 807         spin_lock(&dir->i_lock);
 808         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 809         if (!cinfo->atomic || cinfo->before != dir->i_version)
 810                 nfs_force_lookup_revalidate(dir);
 811         dir->i_version = cinfo->after;
 812         spin_unlock(&dir->i_lock);
 813 }
 814
 815 struct nfs4_opendata {
 816         struct kref kref;
 817         struct nfs_openargs o_arg;
 818         struct nfs_openres o_res;
 819         struct nfs_open_confirmargs c_arg;
 820         struct nfs_open_confirmres c_res;
 821         struct nfs4_string owner_name;
 822         struct nfs4_string group_name;
 823         struct nfs_fattr f_attr;
 824         struct dentry *dir;
 825         struct dentry *dentry;
 826         struct nfs4_state_owner *owner;
 827         struct nfs4_state *state;
 828         struct iattr attrs;
 829         unsigned long timestamp;
 830         unsigned int rpc_done : 1;
 831         int rpc_status;
 832         int cancelled;
 833 };
 834
 835
 836 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 837 {
 838         p->o_res.f_attr = &p->f_attr;
 839         p->o_res.seqid = p->o_arg.seqid;
 840         p->c_res.seqid = p->c_arg.seqid;
 841         p->o_res.server = p->o_arg.server;
 842         p->o_res.access_request = p->o_arg.access;
 843         nfs_fattr_init(&p->f_attr);
 844         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 845 }
 846
 847 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 848                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 849                 const struct iattr *attrs,
 850                 gfp_t gfp_mask)
 851 {
 852         struct dentry *parent = dget_parent(dentry);
 853         struct inode *dir = parent->d_inode;
 854         struct nfs_server *server = NFS_SERVER(dir);
 855         struct nfs4_opendata *p;
 856
 857         p = kzalloc(sizeof(*p), gfp_mask);
 858         if (p == NULL)
 859                 goto err;
 860         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 861         if (p->o_arg.seqid == NULL)
 862                 goto err_free;
 863         nfs_sb_active(dentry->d_sb);
 864         p->dentry = dget(dentry);
 865         p->dir = parent;
 866         p->owner = sp;
 867         atomic_inc(&sp->so_count);
 868         p->o_arg.fh = NFS_FH(dir);
 869         p->o_arg.open_flags = flags;
 870         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 871         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 872          * will return permission denied for all bits until close */
 873         if (!(flags & O_EXCL)) {
 874                 /* ask server to check for all possible rights as results
 875                  * are cached */
 876                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 877                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 878         }
 879         p->o_arg.clientid = server->nfs_client->cl_clientid;
 880         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 881         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 882         p->o_arg.name = &dentry->d_name;
 883         p->o_arg.server = server;
 884         p->o_arg.bitmask = server->attr_bitmask;
 885         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 886         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 887         if (attrs != NULL && attrs->ia_valid != 0) {
 888                 __be32 verf[2];
 889
 890                 p->o_arg.u.attrs = &p->attrs;
 891                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 892
 893                 verf[0] = jiffies;
 894                 verf[1] = current->pid;
 895                 memcpy(p->o_arg.u.verifier.data, verf,
 896                                 sizeof(p->o_arg.u.verifier.data));
 897         }
 898         p->c_arg.fh = &p->o_res.fh;
 899         p->c_arg.stateid = &p->o_res.stateid;
 900         p->c_arg.seqid = p->o_arg.seqid;
 901         nfs4_init_opendata_res(p);
 902         kref_init(&p->kref);
 903         return p;
 904 err_free:
 905         kfree(p);
 906 err:
 907         dput(parent);
 908         return NULL;
 909 }
 910
 911 static void nfs4_opendata_free(struct kref *kref)
 912 {
 913         struct nfs4_opendata *p = container_of(kref,
 914                         struct nfs4_opendata, kref);
 915         struct super_block *sb = p->dentry->d_sb;
 916
 917         nfs_free_seqid(p->o_arg.seqid);
 918         if (p->state != NULL)
 919                 nfs4_put_open_state(p->state);
 920         nfs4_put_state_owner(p->owner);
 921         dput(p->dir);
 922         dput(p->dentry);
 923         nfs_sb_deactive(sb);
 924         nfs_fattr_free_names(&p->f_attr);
 925         kfree(p);
 926 }
 927
 928 static void nfs4_opendata_put(struct nfs4_opendata *p)
 929 {
 930         if (p != NULL)
 931                 kref_put(&p->kref, nfs4_opendata_free);
 932 }
 933
 934 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 935 {
 936         int ret;
 937
 938         ret = rpc_wait_for_completion_task(task);
 939         return ret;
 940 }
 941
 942 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 943 {
 944         int ret = 0;
 945
 946         if (open_mode & (O_EXCL|O_TRUNC))
 947                 goto out;
 948         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 949                 case FMODE_READ:
 950                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 951                                 && state->n_rdonly != 0;
 952                         break;
 953                 case FMODE_WRITE:
 954                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 955                                 && state->n_wronly != 0;
 956                         break;
 957                 case FMODE_READ|FMODE_WRITE:
 958                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 959                                 && state->n_rdwr != 0;
 960         }
 961 out:
 962         return ret;
 963 }
 964
 965 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 966 {
 967         if (delegation == NULL)
 968                 return 0;
 969         if ((delegation->type & fmode) != fmode)
 970                 return 0;
 971         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 972                 return 0;
 973         nfs_mark_delegation_referenced(delegation);
 974         return 1;
 975 }
 976
 977 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 978 {
 979         switch (fmode) {
 980                 case FMODE_WRITE:
 981                         state->n_wronly++;
 982                         break;
 983                 case FMODE_READ:
 984                         state->n_rdonly++;
 985                         break;
 986                 case FMODE_READ|FMODE_WRITE:
 987                         state->n_rdwr++;
 988         }
 989         nfs4_state_set_mode_locked(state, state->state | fmode);
 990 }
 991
 992 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 993 {
 994         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 995                 nfs4_stateid_copy(&state->stateid, stateid);
 996         nfs4_stateid_copy(&state->open_stateid, stateid);
 997         switch (fmode) {
 998                 case FMODE_READ:
 999                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1000                         break;
1001                 case FMODE_WRITE:
1002                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1003                         break;
1004                 case FMODE_READ|FMODE_WRITE:
1005                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1006         }
1007 }
1008
1009 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1010 {
1011         write_seqlock(&state->seqlock);
1012         nfs_set_open_stateid_locked(state, stateid, fmode);
1013         write_sequnlock(&state->seqlock);
1014 }
1015
1016 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1017 {
1018         /*
1019          * Protect the call to nfs4_state_set_mode_locked and
1020          * serialise the stateid update
1021          */
1022         write_seqlock(&state->seqlock);
1023         if (deleg_stateid != NULL) {
1024                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1025                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1026         }
1027         if (open_stateid != NULL)
1028                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1029         write_sequnlock(&state->seqlock);
1030         spin_lock(&state->owner->so_lock);
1031         update_open_stateflags(state, fmode);
1032         spin_unlock(&state->owner->so_lock);
1033 }
1034
1035 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1036 {
1037         struct nfs_inode *nfsi = NFS_I(state->inode);
1038         struct nfs_delegation *deleg_cur;
1039         int ret = 0;
1040
1041         fmode &= (FMODE_READ|FMODE_WRITE);
1042
1043         rcu_read_lock();
1044         deleg_cur = rcu_dereference(nfsi->delegation);
1045         if (deleg_cur == NULL)
1046                 goto no_delegation;
1047
1048         spin_lock(&deleg_cur->lock);
1049         if (nfsi->delegation != deleg_cur ||
1050             (deleg_cur->type & fmode) != fmode)
1051                 goto no_delegation_unlock;
1052
1053         if (delegation == NULL)
1054                 delegation = &deleg_cur->stateid;
1055         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1056                 goto no_delegation_unlock;
1057
1058         nfs_mark_delegation_referenced(deleg_cur);
1059         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1060         ret = 1;
1061 no_delegation_unlock:
1062         spin_unlock(&deleg_cur->lock);
1063 no_delegation:
1064         rcu_read_unlock();
1065
1066         if (!ret && open_stateid != NULL) {
1067                 __update_open_stateid(state, open_stateid, NULL, fmode);
1068                 ret = 1;
1069         }
1070
1071         return ret;
1072 }
1073
1074
1075 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1076 {
1077         struct nfs_delegation *delegation;
1078
1079         rcu_read_lock();
1080         delegation = rcu_dereference(NFS_I(inode)->delegation);
1081         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1082                 rcu_read_unlock();
1083                 return;
1084         }
1085         rcu_read_unlock();
1086         nfs4_inode_return_delegation(inode);
1087 }
1088
1089 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1090 {
1091         struct nfs4_state *state = opendata->state;
1092         struct nfs_inode *nfsi = NFS_I(state->inode);
1093         struct nfs_delegation *delegation;
1094         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1095         fmode_t fmode = opendata->o_arg.fmode;
1096         nfs4_stateid stateid;
1097         int ret = -EAGAIN;
1098
1099         for (;;) {
1100                 if (can_open_cached(state, fmode, open_mode)) {
1101                         spin_lock(&state->owner->so_lock);
1102                         if (can_open_cached(state, fmode, open_mode)) {
1103                                 update_open_stateflags(state, fmode);
1104                                 spin_unlock(&state->owner->so_lock);
1105                                 goto out_return_state;
1106                         }
1107                         spin_unlock(&state->owner->so_lock);
1108                 }
1109                 rcu_read_lock();
1110                 delegation = rcu_dereference(nfsi->delegation);
1111                 if (!can_open_delegated(delegation, fmode)) {
1112                         rcu_read_unlock();
1113                         break;
1114                 }
1115                 /* Save the delegation */
1116                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1117                 rcu_read_unlock();
1118                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1119                 if (ret != 0)
1120                         goto out;
1121                 ret = -EAGAIN;
1122
1123                 /* Try to update the stateid using the delegation */
1124                 if (update_open_stateid(state, NULL, &stateid, fmode))
1125                         goto out_return_state;
1126         }
1127 out:
1128         return ERR_PTR(ret);
1129 out_return_state:
1130         atomic_inc(&state->count);
1131         return state;
1132 }
1133
1134 static void
1135 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1136 {
1137         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1138         struct nfs_delegation *delegation;
1139         int delegation_flags = 0;
1140
1141         rcu_read_lock();
1142         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1143         if (delegation)
1144                 delegation_flags = delegation->flags;
1145         rcu_read_unlock();
1146         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1147                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1148                                    "returning a delegation for "
1149                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1150                                    clp->cl_hostname);
1151         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1152                 nfs_inode_set_delegation(state->inode,
1153                                          data->owner->so_cred,
1154                                          &data->o_res);
1155         else
1156                 nfs_inode_reclaim_delegation(state->inode,
1157                                              data->owner->so_cred,
1158                                              &data->o_res);
1159 }
1160
1161 /*
1162  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1163  * and update the nfs4_state.
1164  */
1165 static struct nfs4_state *
1166 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1167 {
1168         struct inode *inode = data->state->inode;
1169         struct nfs4_state *state = data->state;
1170         int ret;
1171
1172         if (!data->rpc_done) {
1173                 ret = data->rpc_status;
1174                 goto err;
1175         }
1176
1177         ret = -ESTALE;
1178         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1179             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1180             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1181                 goto err;
1182
1183         ret = -ENOMEM;
1184         state = nfs4_get_open_state(inode, data->owner);
1185         if (state == NULL)
1186                 goto err;
1187
1188         ret = nfs_refresh_inode(inode, &data->f_attr);
1189         if (ret)
1190                 goto err;
1191
1192         if (data->o_res.delegation_type != 0)
1193                 nfs4_opendata_check_deleg(data, state);
1194         update_open_stateid(state, &data->o_res.stateid, NULL,
1195                             data->o_arg.fmode);
1196
1197         return state;
1198 err:
1199         return ERR_PTR(ret);
1200
1201 }
1202
1203 static struct nfs4_state *
1204 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1205 {
1206         struct inode *inode;
1207         struct nfs4_state *state = NULL;
1208         int ret;
1209
1210         if (!data->rpc_done) {
1211                 state = nfs4_try_open_cached(data);
1212                 goto out;
1213         }
1214
1215         ret = -EAGAIN;
1216         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1217                 goto err;
1218         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1219         ret = PTR_ERR(inode);
1220         if (IS_ERR(inode))
1221                 goto err;
1222         ret = -ENOMEM;
1223         state = nfs4_get_open_state(inode, data->owner);
1224         if (state == NULL)
1225                 goto err_put_inode;
1226         if (data->o_res.delegation_type != 0)
1227                 nfs4_opendata_check_deleg(data, state);
1228         update_open_stateid(state, &data->o_res.stateid, NULL,
1229                         data->o_arg.fmode);
1230         iput(inode);
1231 out:
1232         return state;
1233 err_put_inode:
1234         iput(inode);
1235 err:
1236         return ERR_PTR(ret);
1237 }
1238
1239 static struct nfs4_state *
1240 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1241 {
1242         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1243                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1244         return _nfs4_opendata_to_nfs4_state(data);
1245 }
1246
1247 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1248 {
1249         struct nfs_inode *nfsi = NFS_I(state->inode);
1250         struct nfs_open_context *ctx;
1251
1252         spin_lock(&state->inode->i_lock);
1253         list_for_each_entry(ctx, &nfsi->open_files, list) {
1254                 if (ctx->state != state)
1255                         continue;
1256                 get_nfs_open_context(ctx);
1257                 spin_unlock(&state->inode->i_lock);
1258                 return ctx;
1259         }
1260         spin_unlock(&state->inode->i_lock);
1261         return ERR_PTR(-ENOENT);
1262 }
1263
1264 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1265 {
1266         struct nfs4_opendata *opendata;
1267
1268         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1269         if (opendata == NULL)
1270                 return ERR_PTR(-ENOMEM);
1271         opendata->state = state;
1272         atomic_inc(&state->count);
1273         return opendata;
1274 }
1275
1276 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1277 {
1278         struct nfs4_state *newstate;
1279         int ret;
1280
1281         opendata->o_arg.open_flags = 0;
1282         opendata->o_arg.fmode = fmode;
1283         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1284         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1285         nfs4_init_opendata_res(opendata);
1286         ret = _nfs4_recover_proc_open(opendata);
1287         if (ret != 0)
1288                 return ret;
1289         newstate = nfs4_opendata_to_nfs4_state(opendata);
1290         if (IS_ERR(newstate))
1291                 return PTR_ERR(newstate);
1292         nfs4_close_state(newstate, fmode);
1293         *res = newstate;
1294         return 0;
1295 }
1296
1297 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1298 {
1299         struct nfs4_state *newstate;
1300         int ret;
1301
1302         /* memory barrier prior to reading state->n_* */
1303         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1304         smp_rmb();
1305         if (state->n_rdwr != 0) {
1306                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1307                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1308                 if (ret != 0)
1309                         return ret;
1310                 if (newstate != state)
1311                         return -ESTALE;
1312         }
1313         if (state->n_wronly != 0) {
1314                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1315                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1316                 if (ret != 0)
1317                         return ret;
1318                 if (newstate != state)
1319                         return -ESTALE;
1320         }
1321         if (state->n_rdonly != 0) {
1322                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1323                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1324                 if (ret != 0)
1325                         return ret;
1326                 if (newstate != state)
1327                         return -ESTALE;
1328         }
1329         /*
1330          * We may have performed cached opens for all three recoveries.
1331          * Check if we need to update the current stateid.
1332          */
1333         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1334             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1335                 write_seqlock(&state->seqlock);
1336                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1337                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1338                 write_sequnlock(&state->seqlock);
1339         }
1340         return 0;
1341 }
1342
1343 /*
1344  * OPEN_RECLAIM:
1345  *      reclaim state on the server after a reboot.
1346  */
1347 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1348 {
1349         struct nfs_delegation *delegation;
1350         struct nfs4_opendata *opendata;
1351         fmode_t delegation_type = 0;
1352         int status;
1353
1354         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1355         if (IS_ERR(opendata))
1356                 return PTR_ERR(opendata);
1357         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1358         opendata->o_arg.fh = NFS_FH(state->inode);
1359         rcu_read_lock();
1360         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1361         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1362                 delegation_type = delegation->type;
1363         rcu_read_unlock();
1364         opendata->o_arg.u.delegation_type = delegation_type;
1365         status = nfs4_open_recover(opendata, state);
1366         nfs4_opendata_put(opendata);
1367         return status;
1368 }
1369
1370 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1371 {
1372         struct nfs_server *server = NFS_SERVER(state->inode);
1373         struct nfs4_exception exception = { };
1374         int err;
1375         do {
1376                 err = _nfs4_do_open_reclaim(ctx, state);
1377                 if (err != -NFS4ERR_DELAY)
1378                         break;
1379                 nfs4_handle_exception(server, err, &exception);
1380         } while (exception.retry);
1381         return err;
1382 }
1383
1384 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1385 {
1386         struct nfs_open_context *ctx;
1387         int ret;
1388
1389         ctx = nfs4_state_find_open_context(state);
1390         if (IS_ERR(ctx))
1391                 return PTR_ERR(ctx);
1392         ret = nfs4_do_open_reclaim(ctx, state);
1393         put_nfs_open_context(ctx);
1394         return ret;
1395 }
1396
1397 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1398 {
1399         struct nfs4_opendata *opendata;
1400         int ret;
1401
1402         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1403         if (IS_ERR(opendata))
1404                 return PTR_ERR(opendata);
1405         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1406         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1407         ret = nfs4_open_recover(opendata, state);
1408         nfs4_opendata_put(opendata);
1409         return ret;
1410 }
1411
1412 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1413 {
1414         struct nfs4_exception exception = { };
1415         struct nfs_server *server = NFS_SERVER(state->inode);
1416         int err;
1417         do {
1418                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1419                 switch (err) {
1420                         case 0:
1421                         case -ENOENT:
1422                         case -ESTALE:
1423                                 goto out;
1424                         case -NFS4ERR_BADSESSION:
1425                         case -NFS4ERR_BADSLOT:
1426                         case -NFS4ERR_BAD_HIGH_SLOT:
1427                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1428                         case -NFS4ERR_DEADSESSION:
1429                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1430                                 goto out;
1431                         case -NFS4ERR_STALE_CLIENTID:
1432                         case -NFS4ERR_STALE_STATEID:
1433                         case -NFS4ERR_EXPIRED:
1434                                 /* Don't recall a delegation if it was lost */
1435                                 nfs4_schedule_lease_recovery(server->nfs_client);
1436                                 goto out;
1437                         case -ERESTARTSYS:
1438                                 /*
1439                                  * The show must go on: exit, but mark the
1440                                  * stateid as needing recovery.
1441                                  */
1442                         case -NFS4ERR_DELEG_REVOKED:
1443                         case -NFS4ERR_ADMIN_REVOKED:
1444                         case -NFS4ERR_BAD_STATEID:
1445                                 nfs_inode_find_state_and_recover(state->inode,
1446                                                 stateid);
1447                                 nfs4_schedule_stateid_recovery(server, state);
1448                         case -EKEYEXPIRED:
1449                                 /*
1450                                  * User RPCSEC_GSS context has expired.
1451                                  * We cannot recover this stateid now, so
1452                                  * skip it and allow recovery thread to
1453                                  * proceed.
1454                                  */
1455                         case -ENOMEM:
1456                                 err = 0;
1457                                 goto out;
1458                 }
1459                 err = nfs4_handle_exception(server, err, &exception);
1460         } while (exception.retry);
1461 out:
1462         return err;
1463 }
1464
1465 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1466 {
1467         struct nfs4_opendata *data = calldata;
1468
1469         data->rpc_status = task->tk_status;
1470         if (data->rpc_status == 0) {
1471                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1472                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1473                 renew_lease(data->o_res.server, data->timestamp);
1474                 data->rpc_done = 1;
1475         }
1476 }
1477
1478 static void nfs4_open_confirm_release(void *calldata)
1479 {
1480         struct nfs4_opendata *data = calldata;
1481         struct nfs4_state *state = NULL;
1482
1483         /* If this request hasn't been cancelled, do nothing */
1484         if (data->cancelled == 0)
1485                 goto out_free;
1486         /* In case of error, no cleanup! */
1487         if (!data->rpc_done)
1488                 goto out_free;
1489         state = nfs4_opendata_to_nfs4_state(data);
1490         if (!IS_ERR(state))
1491                 nfs4_close_state(state, data->o_arg.fmode);
1492 out_free:
1493         nfs4_opendata_put(data);
1494 }
1495
1496 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1497         .rpc_call_done = nfs4_open_confirm_done,
1498         .rpc_release = nfs4_open_confirm_release,
1499 };
1500
1501 /*
1502  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1503  */
1504 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1505 {
1506         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1507         struct rpc_task *task;
1508         struct  rpc_message msg = {
1509                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1510                 .rpc_argp = &data->c_arg,
1511                 .rpc_resp = &data->c_res,
1512                 .rpc_cred = data->owner->so_cred,
1513         };
1514         struct rpc_task_setup task_setup_data = {
1515                 .rpc_client = server->client,
1516                 .rpc_message = &msg,
1517                 .callback_ops = &nfs4_open_confirm_ops,
1518                 .callback_data = data,
1519                 .workqueue = nfsiod_workqueue,
1520                 .flags = RPC_TASK_ASYNC,
1521         };
1522         int status;
1523
1524         kref_get(&data->kref);
1525         data->rpc_done = 0;
1526         data->rpc_status = 0;
1527         data->timestamp = jiffies;
1528         task = rpc_run_task(&task_setup_data);
1529         if (IS_ERR(task))
1530                 return PTR_ERR(task);
1531         status = nfs4_wait_for_completion_rpc_task(task);
1532         if (status != 0) {
1533                 data->cancelled = 1;
1534                 smp_wmb();
1535         } else
1536                 status = data->rpc_status;
1537         rpc_put_task(task);
1538         return status;
1539 }
1540
1541 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1542 {
1543         struct nfs4_opendata *data = calldata;
1544         struct nfs4_state_owner *sp = data->owner;
1545
1546         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1547                 return;
1548         /*
1549          * Check if we still need to send an OPEN call, or if we can use
1550          * a delegation instead.
1551          */
1552         if (data->state != NULL) {
1553                 struct nfs_delegation *delegation;
1554
1555                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1556                         goto out_no_action;
1557                 rcu_read_lock();
1558                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1559                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1560                     can_open_delegated(delegation, data->o_arg.fmode))
1561                         goto unlock_no_action;
1562                 rcu_read_unlock();
1563         }
1564         /* Update client id. */
1565         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1566         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1567                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1568                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1569                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1570         }
1571         data->timestamp = jiffies;
1572         if (nfs4_setup_sequence(data->o_arg.server,
1573                                 &data->o_arg.seq_args,
1574                                 &data->o_res.seq_res,
1575                                 task) != 0)
1576                 nfs_release_seqid(data->o_arg.seqid);
1577         else
1578                 rpc_call_start(task);
1579         return;
1580 unlock_no_action:
1581         rcu_read_unlock();
1582 out_no_action:
1583         task->tk_action = NULL;
1584
1585 }
1586
1587 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1588 {
1589         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1590         nfs4_open_prepare(task, calldata);
1591 }
1592
1593 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1594 {
1595         struct nfs4_opendata *data = calldata;
1596
1597         data->rpc_status = task->tk_status;
1598
1599         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1600                 return;
1601
1602         if (task->tk_status == 0) {
1603                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1604                         switch (data->o_res.f_attr->mode & S_IFMT) {
1605                         case S_IFREG:
1606                                 break;
1607                         case S_IFLNK:
1608                                 data->rpc_status = -ELOOP;
1609                                 break;
1610                         case S_IFDIR:
1611                                 data->rpc_status = -EISDIR;
1612                                 break;
1613                         default:
1614                                 data->rpc_status = -ENOTDIR;
1615                         }
1616                 }
1617                 renew_lease(data->o_res.server, data->timestamp);
1618                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1619                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1620         }
1621         data->rpc_done = 1;
1622 }
1623
1624 static void nfs4_open_release(void *calldata)
1625 {
1626         struct nfs4_opendata *data = calldata;
1627         struct nfs4_state *state = NULL;
1628
1629         /* If this request hasn't been cancelled, do nothing */
1630         if (data->cancelled == 0)
1631                 goto out_free;
1632         /* In case of error, no cleanup! */
1633         if (data->rpc_status != 0 || !data->rpc_done)
1634                 goto out_free;
1635         /* In case we need an open_confirm, no cleanup! */
1636         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1637                 goto out_free;
1638         state = nfs4_opendata_to_nfs4_state(data);
1639         if (!IS_ERR(state))
1640                 nfs4_close_state(state, data->o_arg.fmode);
1641 out_free:
1642         nfs4_opendata_put(data);
1643 }
1644
1645 static const struct rpc_call_ops nfs4_open_ops = {
1646         .rpc_call_prepare = nfs4_open_prepare,
1647         .rpc_call_done = nfs4_open_done,
1648         .rpc_release = nfs4_open_release,
1649 };
1650
1651 static const struct rpc_call_ops nfs4_recover_open_ops = {
1652         .rpc_call_prepare = nfs4_recover_open_prepare,
1653         .rpc_call_done = nfs4_open_done,
1654         .rpc_release = nfs4_open_release,
1655 };
1656
1657 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1658 {
1659         struct inode *dir = data->dir->d_inode;
1660         struct nfs_server *server = NFS_SERVER(dir);
1661         struct nfs_openargs *o_arg = &data->o_arg;
1662         struct nfs_openres *o_res = &data->o_res;
1663         struct rpc_task *task;
1664         struct rpc_message msg = {
1665                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1666                 .rpc_argp = o_arg,
1667                 .rpc_resp = o_res,
1668                 .rpc_cred = data->owner->so_cred,
1669         };
1670         struct rpc_task_setup task_setup_data = {
1671                 .rpc_client = server->client,
1672                 .rpc_message = &msg,
1673                 .callback_ops = &nfs4_open_ops,
1674                 .callback_data = data,
1675                 .workqueue = nfsiod_workqueue,
1676                 .flags = RPC_TASK_ASYNC,
1677         };
1678         int status;
1679
1680         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1681         kref_get(&data->kref);
1682         data->rpc_done = 0;
1683         data->rpc_status = 0;
1684         data->cancelled = 0;
1685         if (isrecover)
1686                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1687         task = rpc_run_task(&task_setup_data);
1688         if (IS_ERR(task))
1689                 return PTR_ERR(task);
1690         status = nfs4_wait_for_completion_rpc_task(task);
1691         if (status != 0) {
1692                 data->cancelled = 1;
1693                 smp_wmb();
1694         } else
1695                 status = data->rpc_status;
1696         rpc_put_task(task);
1697
1698         return status;
1699 }
1700
1701 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1702 {
1703         struct inode *dir = data->dir->d_inode;
1704         struct nfs_openres *o_res = &data->o_res;
1705         int status;
1706
1707         status = nfs4_run_open_task(data, 1);
1708         if (status != 0 || !data->rpc_done)
1709                 return status;
1710
1711         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1712
1713         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1714                 status = _nfs4_proc_open_confirm(data);
1715                 if (status != 0)
1716                         return status;
1717         }
1718
1719         return status;
1720 }
1721
1722 static int nfs4_opendata_access(struct rpc_cred *cred,
1723                                 struct nfs4_opendata *opendata,
1724                                 struct nfs4_state *state, fmode_t fmode)
1725 {
1726         struct nfs_access_entry cache;
1727         u32 mask;
1728
1729         /* access call failed or for some reason the server doesn't
1730          * support any access modes -- defer access call until later */
1731         if (opendata->o_res.access_supported == 0)
1732                 return 0;
1733
1734         mask = 0;
1735         /* don't check MAY_WRITE - a newly created file may not have
1736          * write mode bits, but POSIX allows the creating process to write */
1737         if (fmode & FMODE_READ)
1738                 mask |= MAY_READ;
1739         if (fmode & FMODE_EXEC)
1740                 mask |= MAY_EXEC;
1741
1742         cache.cred = cred;
1743         cache.jiffies = jiffies;
1744         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1745         nfs_access_add_cache(state->inode, &cache);
1746
1747         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1748                 return 0;
1749
1750         /* even though OPEN succeeded, access is denied. Close the file */
1751         nfs4_close_state(state, fmode);
1752         return -EACCES;
1753 }
1754
1755 /*
1756  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1757  */
1758 static int _nfs4_proc_open(struct nfs4_opendata *data)
1759 {
1760         struct inode *dir = data->dir->d_inode;
1761         struct nfs_server *server = NFS_SERVER(dir);
1762         struct nfs_openargs *o_arg = &data->o_arg;
1763         struct nfs_openres *o_res = &data->o_res;
1764         int status;
1765
1766         status = nfs4_run_open_task(data, 0);
1767         if (!data->rpc_done)
1768                 return status;
1769         if (status != 0) {
1770                 if (status == -NFS4ERR_BADNAME &&
1771                                 !(o_arg->open_flags & O_CREAT))
1772                         return -ENOENT;
1773                 return status;
1774         }
1775
1776         nfs_fattr_map_and_free_names(server, &data->f_attr);
1777
1778         if (o_arg->open_flags & O_CREAT)
1779                 update_changeattr(dir, &o_res->cinfo);
1780         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1781                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1782         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1783                 status = _nfs4_proc_open_confirm(data);
1784                 if (status != 0)
1785                         return status;
1786         }
1787         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1788                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1789         return 0;
1790 }
1791
1792 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1793 {
1794         unsigned int loop;
1795         int ret;
1796
1797         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1798                 ret = nfs4_wait_clnt_recover(clp);
1799                 if (ret != 0)
1800                         break;
1801                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1802                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1803                         break;
1804                 nfs4_schedule_state_manager(clp);
1805                 ret = -EIO;
1806         }
1807         return ret;
1808 }
1809
1810 static int nfs4_recover_expired_lease(struct nfs_server *server)
1811 {
1812         return nfs4_client_recover_expired_lease(server->nfs_client);
1813 }
1814
1815 /*
1816  * OPEN_EXPIRED:
1817  *      reclaim state on the server after a network partition.
1818  *      Assumes caller holds the appropriate lock
1819  */
1820 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1821 {
1822         struct nfs4_opendata *opendata;
1823         int ret;
1824
1825         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1826         if (IS_ERR(opendata))
1827                 return PTR_ERR(opendata);
1828         ret = nfs4_open_recover(opendata, state);
1829         if (ret == -ESTALE)
1830                 d_drop(ctx->dentry);
1831         nfs4_opendata_put(opendata);
1832         return ret;
1833 }
1834
1835 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1836 {
1837         struct nfs_server *server = NFS_SERVER(state->inode);
1838         struct nfs4_exception exception = { };
1839         int err;
1840
1841         do {
1842                 err = _nfs4_open_expired(ctx, state);
1843                 switch (err) {
1844                 default:
1845                         goto out;
1846                 case -NFS4ERR_GRACE:
1847                 case -NFS4ERR_DELAY:
1848                         nfs4_handle_exception(server, err, &exception);
1849                         err = 0;
1850                 }
1851         } while (exception.retry);
1852 out:
1853         return err;
1854 }
1855
1856 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1857 {
1858         struct nfs_open_context *ctx;
1859         int ret;
1860
1861         ctx = nfs4_state_find_open_context(state);
1862         if (IS_ERR(ctx))
1863                 return PTR_ERR(ctx);
1864         ret = nfs4_do_open_expired(ctx, state);
1865         put_nfs_open_context(ctx);
1866         return ret;
1867 }
1868
1869 #if defined(CONFIG_NFS_V4_1)
1870 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1871 {
1872         struct nfs_server *server = NFS_SERVER(state->inode);
1873         nfs4_stateid *stateid = &state->stateid;
1874         int status;
1875
1876         /* If a state reset has been done, test_stateid is unneeded */
1877         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1878                 return;
1879
1880         status = nfs41_test_stateid(server, stateid);
1881         if (status != NFS_OK) {
1882                 /* Free the stateid unless the server explicitly
1883                  * informs us the stateid is unrecognized. */
1884                 if (status != -NFS4ERR_BAD_STATEID)
1885                         nfs41_free_stateid(server, stateid);
1886                 nfs_remove_bad_delegation(state->inode);
1887
1888                 write_seqlock(&state->seqlock);
1889                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1890                 write_sequnlock(&state->seqlock);
1891                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1892         }
1893 }
1894
1895 /**
1896  * nfs41_check_open_stateid - possibly free an open stateid
1897  *
1898  * @state: NFSv4 state for an inode
1899  *
1900  * Returns NFS_OK if recovery for this stateid is now finished.
1901  * Otherwise a negative NFS4ERR value is returned.
1902  */
1903 static int nfs41_check_open_stateid(struct nfs4_state *state)
1904 {
1905         struct nfs_server *server = NFS_SERVER(state->inode);
1906         nfs4_stateid *stateid = &state->open_stateid;
1907         int status;
1908
1909         /* If a state reset has been done, test_stateid is unneeded */
1910         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1911             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1912             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1913                 return -NFS4ERR_BAD_STATEID;
1914
1915         status = nfs41_test_stateid(server, stateid);
1916         if (status != NFS_OK) {
1917                 /* Free the stateid unless the server explicitly
1918                  * informs us the stateid is unrecognized. */
1919                 if (status != -NFS4ERR_BAD_STATEID)
1920                         nfs41_free_stateid(server, stateid);
1921
1922                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1923                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1924                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1925         }
1926         return status;
1927 }
1928
1929 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1930 {
1931         int status;
1932
1933         nfs41_clear_delegation_stateid(state);
1934         status = nfs41_check_open_stateid(state);
1935         if (status != NFS_OK)
1936                 status = nfs4_open_expired(sp, state);
1937         return status;
1938 }
1939 #endif
1940
1941 /*
1942  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1943  * fields corresponding to attributes that were used to store the verifier.
1944  * Make sure we clobber those fields in the later setattr call
1945  */
1946 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1947 {
1948         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1949             !(sattr->ia_valid & ATTR_ATIME_SET))
1950                 sattr->ia_valid |= ATTR_ATIME;
1951
1952         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1953             !(sattr->ia_valid & ATTR_MTIME_SET))
1954                 sattr->ia_valid |= ATTR_MTIME;
1955 }
1956
1957 /*
1958  * Returns a referenced nfs4_state
1959  */
1960 static int _nfs4_do_open(struct inode *dir,
1961                         struct dentry *dentry,
1962                         fmode_t fmode,
1963                         int flags,
1964                         struct iattr *sattr,
1965                         struct rpc_cred *cred,
1966                         struct nfs4_state **res,
1967                         struct nfs4_threshold **ctx_th)
1968 {
1969         struct nfs4_state_owner  *sp;
1970         struct nfs4_state     *state = NULL;
1971         struct nfs_server       *server = NFS_SERVER(dir);
1972         struct nfs4_opendata *opendata;
1973         int status;
1974
1975         /* Protect against reboot recovery conflicts */
1976         status = -ENOMEM;
1977         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1978         if (sp == NULL) {
1979                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1980                 goto out_err;
1981         }
1982         status = nfs4_recover_expired_lease(server);
1983         if (status != 0)
1984                 goto err_put_state_owner;
1985         if (dentry->d_inode != NULL)
1986                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1987         status = -ENOMEM;
1988         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1989         if (opendata == NULL)
1990                 goto err_put_state_owner;
1991
1992         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1993                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1994                 if (!opendata->f_attr.mdsthreshold)
1995                         goto err_opendata_put;
1996                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1997         }
1998         if (dentry->d_inode != NULL)
1999                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2000
2001         status = _nfs4_proc_open(opendata);
2002         if (status != 0)
2003                 goto err_opendata_put;
2004
2005         state = nfs4_opendata_to_nfs4_state(opendata);
2006         status = PTR_ERR(state);
2007         if (IS_ERR(state))
2008                 goto err_opendata_put;
2009         if (server->caps & NFS_CAP_POSIX_LOCK)
2010                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2011
2012         status = nfs4_opendata_access(cred, opendata, state, fmode);
2013         if (status != 0)
2014                 goto err_opendata_put;
2015
2016         if (opendata->o_arg.open_flags & O_EXCL) {
2017                 nfs4_exclusive_attrset(opendata, sattr);
2018
2019                 nfs_fattr_init(opendata->o_res.f_attr);
2020                 status = nfs4_do_setattr(state->inode, cred,
2021                                 opendata->o_res.f_attr, sattr,
2022                                 state);
2023                 if (status == 0)
2024                         nfs_setattr_update_inode(state->inode, sattr);
2025                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2026         }
2027
2028         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2029                 *ctx_th = opendata->f_attr.mdsthreshold;
2030         else
2031                 kfree(opendata->f_attr.mdsthreshold);
2032         opendata->f_attr.mdsthreshold = NULL;
2033
2034         nfs4_opendata_put(opendata);
2035         nfs4_put_state_owner(sp);
2036         *res = state;
2037         return 0;
2038 err_opendata_put:
2039         kfree(opendata->f_attr.mdsthreshold);
2040         nfs4_opendata_put(opendata);
2041 err_put_state_owner:
2042         nfs4_put_state_owner(sp);
2043 out_err:
2044         *res = NULL;
2045         return status;
2046 }
2047
2048
2049 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2050                                         struct dentry *dentry,
2051                                         fmode_t fmode,
2052                                         int flags,
2053                                         struct iattr *sattr,
2054                                         struct rpc_cred *cred,
2055                                         struct nfs4_threshold **ctx_th)
2056 {
2057         struct nfs4_exception exception = { };
2058         struct nfs4_state *res;
2059         int status;
2060
2061         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
2062         do {
2063                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
2064                                        &res, ctx_th);
2065                 if (status == 0)
2066                         break;
2067                 /* NOTE: BAD_SEQID means the server and client disagree about the
2068                  * book-keeping w.r.t. state-changing operations
2069                  * (OPEN/CLOSE/LOCK/LOCKU...)
2070                  * It is actually a sign of a bug on the client or on the server.
2071                  *
2072                  * If we receive a BAD_SEQID error in the particular case of
2073                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2074                  * have unhashed the old state_owner for us, and that we can
2075                  * therefore safely retry using a new one. We should still warn
2076                  * the user though...
2077                  */
2078                 if (status == -NFS4ERR_BAD_SEQID) {
2079                         pr_warn_ratelimited("NFS: v4 server %s "
2080                                         " returned a bad sequence-id error!\n",
2081                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2082                         exception.retry = 1;
2083                         continue;
2084                 }
2085                 /*
2086                  * BAD_STATEID on OPEN means that the server cancelled our
2087                  * state before it received the OPEN_CONFIRM.
2088                  * Recover by retrying the request as per the discussion
2089                  * on Page 181 of RFC3530.
2090                  */
2091                 if (status == -NFS4ERR_BAD_STATEID) {
2092                         exception.retry = 1;
2093                         continue;
2094                 }
2095                 if (status == -EAGAIN) {
2096                         /* We must have found a delegation */
2097                         exception.retry = 1;
2098                         continue;
2099                 }
2100                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
2101                                         status, &exception));
2102         } while (exception.retry);
2103         return res;
2104 }
2105
2106 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2107                             struct nfs_fattr *fattr, struct iattr *sattr,
2108                             struct nfs4_state *state)
2109 {
2110         struct nfs_server *server = NFS_SERVER(inode);
2111         struct nfs_setattrargs  arg = {
2112                 .fh             = NFS_FH(inode),
2113                 .iap            = sattr,
2114                 .server         = server,
2115                 .bitmask = server->attr_bitmask,
2116         };
2117         struct nfs_setattrres  res = {
2118                 .fattr          = fattr,
2119                 .server         = server,
2120         };
2121         struct rpc_message msg = {
2122                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2123                 .rpc_argp       = &arg,
2124                 .rpc_resp       = &res,
2125                 .rpc_cred       = cred,
2126         };
2127         unsigned long timestamp = jiffies;
2128         int status;
2129
2130         nfs_fattr_init(fattr);
2131
2132         if (state != NULL) {
2133                 struct nfs_lockowner lockowner = {
2134                         .l_owner = current->files,
2135                         .l_pid = current->tgid,
2136                 };
2137                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2138                                 &lockowner);
2139         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2140                                 FMODE_WRITE)) {
2141                 /* Use that stateid */
2142         } else
2143                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2144
2145         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2146         if (status == 0 && state != NULL)
2147                 renew_lease(server, timestamp);
2148         return status;
2149 }
2150
2151 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2152                            struct nfs_fattr *fattr, struct iattr *sattr,
2153                            struct nfs4_state *state)
2154 {
2155         struct nfs_server *server = NFS_SERVER(inode);
2156         struct nfs4_exception exception = {
2157                 .state = state,
2158                 .inode = inode,
2159         };
2160         int err;
2161         do {
2162                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2163                 switch (err) {
2164                 case -NFS4ERR_OPENMODE:
2165                         if (state && !(state->state & FMODE_WRITE)) {
2166                                 err = -EBADF;
2167                                 if (sattr->ia_valid & ATTR_OPEN)
2168                                         err = -EACCES;
2169                                 goto out;
2170                         }
2171                 }
2172                 err = nfs4_handle_exception(server, err, &exception);
2173         } while (exception.retry);
2174 out:
2175         return err;
2176 }
2177
2178 struct nfs4_closedata {
2179         struct inode *inode;
2180         struct nfs4_state *state;
2181         struct nfs_closeargs arg;
2182         struct nfs_closeres res;
2183         struct nfs_fattr fattr;
2184         unsigned long timestamp;
2185         bool roc;
2186         u32 roc_barrier;
2187 };
2188
2189 static void nfs4_free_closedata(void *data)
2190 {
2191         struct nfs4_closedata *calldata = data;
2192         struct nfs4_state_owner *sp = calldata->state->owner;
2193         struct super_block *sb = calldata->state->inode->i_sb;
2194
2195         if (calldata->roc)
2196                 pnfs_roc_release(calldata->state->inode);
2197         nfs4_put_open_state(calldata->state);
2198         nfs_free_seqid(calldata->arg.seqid);
2199         nfs4_put_state_owner(sp);
2200         nfs_sb_deactive_async(sb);
2201         kfree(calldata);
2202 }
2203
2204 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2205                 fmode_t fmode)
2206 {
2207         spin_lock(&state->owner->so_lock);
2208         if (!(fmode & FMODE_READ))
2209                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2210         if (!(fmode & FMODE_WRITE))
2211                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2212         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2213         spin_unlock(&state->owner->so_lock);
2214 }
2215
2216 static void nfs4_close_done(struct rpc_task *task, void *data)
2217 {
2218         struct nfs4_closedata *calldata = data;
2219         struct nfs4_state *state = calldata->state;
2220         struct nfs_server *server = NFS_SERVER(calldata->inode);
2221
2222         dprintk("%s: begin!\n", __func__);
2223         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2224                 return;
2225         /* hmm. we are done with the inode, and in the process of freeing
2226          * the state_owner. we keep this around to process errors
2227          */
2228         switch (task->tk_status) {
2229                 case 0:
2230                         if (calldata->roc)
2231                                 pnfs_roc_set_barrier(state->inode,
2232                                                      calldata->roc_barrier);
2233                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2234                         renew_lease(server, calldata->timestamp);
2235                         nfs4_close_clear_stateid_flags(state,
2236                                         calldata->arg.fmode);
2237                         break;
2238                 case -NFS4ERR_STALE_STATEID:
2239                 case -NFS4ERR_OLD_STATEID:
2240                 case -NFS4ERR_BAD_STATEID:
2241                 case -NFS4ERR_EXPIRED:
2242                         if (calldata->arg.fmode == 0)
2243                                 break;
2244                 default:
2245                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2246                                 rpc_restart_call_prepare(task);
2247         }
2248         nfs_release_seqid(calldata->arg.seqid);
2249         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2250         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2251 }
2252
2253 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2254 {
2255         struct nfs4_closedata *calldata = data;
2256         struct nfs4_state *state = calldata->state;
2257         struct inode *inode = calldata->inode;
2258         int call_close = 0;
2259
2260         dprintk("%s: begin!\n", __func__);
2261         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2262                 return;
2263
2264         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2265         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2266         spin_lock(&state->owner->so_lock);
2267         /* Calculate the change in open mode */
2268         if (state->n_rdwr == 0) {
2269                 if (state->n_rdonly == 0) {
2270                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2271                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2272                         calldata->arg.fmode &= ~FMODE_READ;
2273                 }
2274                 if (state->n_wronly == 0) {
2275                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2276                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2277                         calldata->arg.fmode &= ~FMODE_WRITE;
2278                 }
2279         }
2280         spin_unlock(&state->owner->so_lock);
2281
2282         if (!call_close) {
2283                 /* Note: exit _without_ calling nfs4_close_done */
2284                 task->tk_action = NULL;
2285                 goto out;
2286         }
2287
2288         if (calldata->arg.fmode == 0) {
2289                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2290                 if (calldata->roc &&
2291                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2292                         goto out;
2293         }
2294
2295         nfs_fattr_init(calldata->res.fattr);
2296         calldata->timestamp = jiffies;
2297         if (nfs4_setup_sequence(NFS_SERVER(inode),
2298                                 &calldata->arg.seq_args,
2299                                 &calldata->res.seq_res,
2300                                 task) != 0)
2301                 nfs_release_seqid(calldata->arg.seqid);
2302         else
2303                 rpc_call_start(task);
2304 out:
2305         dprintk("%s: done!\n", __func__);
2306 }
2307
2308 static const struct rpc_call_ops nfs4_close_ops = {
2309         .rpc_call_prepare = nfs4_close_prepare,
2310         .rpc_call_done = nfs4_close_done,
2311         .rpc_release = nfs4_free_closedata,
2312 };
2313
2314 /*
2315  * It is possible for data to be read/written from a mem-mapped file
2316  * after the sys_close call (which hits the vfs layer as a flush).
2317  * This means that we can't safely call nfsv4 close on a file until
2318  * the inode is cleared. This in turn means that we are not good
2319  * NFSv4 citizens - we do not indicate to the server to update the file's
2320  * share state even when we are done with one of the three share
2321  * stateid's in the inode.
2322  *
2323  * NOTE: Caller must be holding the sp->so_owner semaphore!
2324  */
2325 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2326 {
2327         struct nfs_server *server = NFS_SERVER(state->inode);
2328         struct nfs4_closedata *calldata;
2329         struct nfs4_state_owner *sp = state->owner;
2330         struct rpc_task *task;
2331         struct rpc_message msg = {
2332                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2333                 .rpc_cred = state->owner->so_cred,
2334         };
2335         struct rpc_task_setup task_setup_data = {
2336                 .rpc_client = server->client,
2337                 .rpc_message = &msg,
2338                 .callback_ops = &nfs4_close_ops,
2339                 .workqueue = nfsiod_workqueue,
2340                 .flags = RPC_TASK_ASYNC,
2341         };
2342         int status = -ENOMEM;
2343
2344         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2345         if (calldata == NULL)
2346                 goto out;
2347         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2348         calldata->inode = state->inode;
2349         calldata->state = state;
2350         calldata->arg.fh = NFS_FH(state->inode);
2351         calldata->arg.stateid = &state->open_stateid;
2352         /* Serialization for the sequence id */
2353         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2354         if (calldata->arg.seqid == NULL)
2355                 goto out_free_calldata;
2356         calldata->arg.fmode = 0;
2357         calldata->arg.bitmask = server->cache_consistency_bitmask;
2358         calldata->res.fattr = &calldata->fattr;
2359         calldata->res.seqid = calldata->arg.seqid;
2360         calldata->res.server = server;
2361         calldata->roc = pnfs_roc(state->inode);
2362         nfs_sb_active(calldata->inode->i_sb);
2363
2364         msg.rpc_argp = &calldata->arg;
2365         msg.rpc_resp = &calldata->res;
2366         task_setup_data.callback_data = calldata;
2367         task = rpc_run_task(&task_setup_data);
2368         if (IS_ERR(task))
2369                 return PTR_ERR(task);
2370         status = 0;
2371         if (wait)
2372                 status = rpc_wait_for_completion_task(task);
2373         rpc_put_task(task);
2374         return status;
2375 out_free_calldata:
2376         kfree(calldata);
2377 out:
2378         nfs4_put_open_state(state);
2379         nfs4_put_state_owner(sp);
2380         return status;
2381 }
2382
2383 static struct inode *
2384 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2385 {
2386         struct nfs4_state *state;
2387
2388         /* Protect against concurrent sillydeletes */
2389         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2390                              ctx->cred, &ctx->mdsthreshold);
2391         if (IS_ERR(state))
2392                 return ERR_CAST(state);
2393         ctx->state = state;
2394         return igrab(state->inode);
2395 }
2396
2397 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2398 {
2399         if (ctx->state == NULL)
2400                 return;
2401         if (is_sync)
2402                 nfs4_close_sync(ctx->state, ctx->mode);
2403         else
2404                 nfs4_close_state(ctx->state, ctx->mode);
2405 }
2406
2407 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2408 {
2409         struct nfs4_server_caps_arg args = {
2410                 .fhandle = fhandle,
2411         };
2412         struct nfs4_server_caps_res res = {};
2413         struct rpc_message msg = {
2414                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2415                 .rpc_argp = &args,
2416                 .rpc_resp = &res,
2417         };
2418         int status;
2419
2420         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2421         if (status == 0) {
2422                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2423                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2424                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2425                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2426                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2427                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2428                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2429                         server->caps |= NFS_CAP_ACLS;
2430                 if (res.has_links != 0)
2431                         server->caps |= NFS_CAP_HARDLINKS;
2432                 if (res.has_symlinks != 0)
2433                         server->caps |= NFS_CAP_SYMLINKS;
2434                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2435                         server->caps |= NFS_CAP_FILEID;
2436                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2437                         server->caps |= NFS_CAP_MODE;
2438                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2439                         server->caps |= NFS_CAP_NLINK;
2440                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2441                         server->caps |= NFS_CAP_OWNER;
2442                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2443                         server->caps |= NFS_CAP_OWNER_GROUP;
2444                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2445                         server->caps |= NFS_CAP_ATIME;
2446                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2447                         server->caps |= NFS_CAP_CTIME;
2448                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2449                         server->caps |= NFS_CAP_MTIME;
2450
2451                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2452                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2453                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2454                 server->acl_bitmask = res.acl_bitmask;
2455                 server->fh_expire_type = res.fh_expire_type;
2456         }
2457
2458         return status;
2459 }
2460
2461 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2462 {
2463         struct nfs4_exception exception = { };
2464         int err;
2465         do {
2466                 err = nfs4_handle_exception(server,
2467                                 _nfs4_server_capabilities(server, fhandle),
2468                                 &exception);
2469         } while (exception.retry);
2470         return err;
2471 }
2472
2473 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2474                 struct nfs_fsinfo *info)
2475 {
2476         struct nfs4_lookup_root_arg args = {
2477                 .bitmask = nfs4_fattr_bitmap,
2478         };
2479         struct nfs4_lookup_res res = {
2480                 .server = server,
2481                 .fattr = info->fattr,
2482                 .fh = fhandle,
2483         };
2484         struct rpc_message msg = {
2485                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2486                 .rpc_argp = &args,
2487                 .rpc_resp = &res,
2488         };
2489
2490         nfs_fattr_init(info->fattr);
2491         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2492 }
2493
2494 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2495                 struct nfs_fsinfo *info)
2496 {
2497         struct nfs4_exception exception = { };
2498         int err;
2499         do {
2500                 err = _nfs4_lookup_root(server, fhandle, info);
2501                 switch (err) {
2502                 case 0:
2503                 case -NFS4ERR_WRONGSEC:
2504                         goto out;
2505                 default:
2506                         err = nfs4_handle_exception(server, err, &exception);
2507                 }
2508         } while (exception.retry);
2509 out:
2510         return err;
2511 }
2512
2513 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2514                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2515 {
2516         struct rpc_auth *auth;
2517         int ret;
2518
2519         auth = rpcauth_create(flavor, server->client);
2520         if (IS_ERR(auth)) {
2521                 ret = -EIO;
2522                 goto out;
2523         }
2524         ret = nfs4_lookup_root(server, fhandle, info);
2525 out:
2526         return ret;
2527 }
2528
2529 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2530                               struct nfs_fsinfo *info)
2531 {
2532         int i, len, status = 0;
2533         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2534
2535         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2536         BUG_ON(len < 0);
2537
2538         for (i = 0; i < len; i++) {
2539                 /* AUTH_UNIX is the default flavor if none was specified,
2540                  * thus has already been tried. */
2541                 if (flav_array[i] == RPC_AUTH_UNIX)
2542                         continue;
2543
2544                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2545                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2546                         continue;
2547                 break;
2548         }
2549         /*
2550          * -EACCESS could mean that the user doesn't have correct permissions
2551          * to access the mount.  It could also mean that we tried to mount
2552          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2553          * existing mount programs don't handle -EACCES very well so it should
2554          * be mapped to -EPERM instead.
2555          */
2556         if (status == -EACCES)
2557                 status = -EPERM;
2558         return status;
2559 }
2560
2561 /*
2562  * get the file handle for the "/" directory on the server
2563  */
2564 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2565                          struct nfs_fsinfo *info)
2566 {
2567         int minor_version = server->nfs_client->cl_minorversion;
2568         int status = nfs4_lookup_root(server, fhandle, info);
2569         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2570                 /*
2571                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2572                  * by nfs4_map_errors() as this function exits.
2573                  */
2574                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2575         if (status == 0)
2576                 status = nfs4_server_capabilities(server, fhandle);
2577         if (status == 0)
2578                 status = nfs4_do_fsinfo(server, fhandle, info);
2579         return nfs4_map_errors(status);
2580 }
2581
2582 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2583                               struct nfs_fsinfo *info)
2584 {
2585         int error;
2586         struct nfs_fattr *fattr = info->fattr;
2587
2588         error = nfs4_server_capabilities(server, mntfh);
2589         if (error < 0) {
2590                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2591                 return error;
2592         }
2593
2594         error = nfs4_proc_getattr(server, mntfh, fattr);
2595         if (error < 0) {
2596                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2597                 return error;
2598         }
2599
2600         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2601             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2602                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2603
2604         return error;
2605 }
2606
2607 /*
2608  * Get locations and (maybe) other attributes of a referral.
2609  * Note that we'll actually follow the referral later when
2610  * we detect fsid mismatch in inode revalidation
2611  */
2612 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2613                              const struct qstr *name, struct nfs_fattr *fattr,
2614                              struct nfs_fh *fhandle)
2615 {
2616         int status = -ENOMEM;
2617         struct page *page = NULL;
2618         struct nfs4_fs_locations *locations = NULL;
2619
2620         page = alloc_page(GFP_KERNEL);
2621         if (page == NULL)
2622                 goto out;
2623         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2624         if (locations == NULL)
2625                 goto out;
2626
2627         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2628         if (status != 0)
2629                 goto out;
2630         /* Make sure server returned a different fsid for the referral */
2631         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2632                 dprintk("%s: server did not return a different fsid for"
2633                         " a referral at %s\n", __func__, name->name);
2634                 status = -EIO;
2635                 goto out;
2636         }
2637         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2638         nfs_fixup_referral_attributes(&locations->fattr);
2639
2640         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2641         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2642         memset(fhandle, 0, sizeof(struct nfs_fh));
2643 out:
2644         if (page)
2645                 __free_page(page);
2646         kfree(locations);
2647         return status;
2648 }
2649
2650 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2651 {
2652         struct nfs4_getattr_arg args = {
2653                 .fh = fhandle,
2654                 .bitmask = server->attr_bitmask,
2655         };
2656         struct nfs4_getattr_res res = {
2657                 .fattr = fattr,
2658                 .server = server,
2659         };
2660         struct rpc_message msg = {
2661                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2662                 .rpc_argp = &args,
2663                 .rpc_resp = &res,
2664         };
2665
2666         nfs_fattr_init(fattr);
2667         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2668 }
2669
2670 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2671 {
2672         struct nfs4_exception exception = { };
2673         int err;
2674         do {
2675                 err = nfs4_handle_exception(server,
2676                                 _nfs4_proc_getattr(server, fhandle, fattr),
2677                                 &exception);
2678         } while (exception.retry);
2679         return err;
2680 }
2681
2682 /*
2683  * The file is not closed if it is opened due to the a request to change
2684  * the size of the file. The open call will not be needed once the
2685  * VFS layer lookup-intents are implemented.
2686  *
2687  * Close is called when the inode is destroyed.
2688  * If we haven't opened the file for O_WRONLY, we
2689  * need to in the size_change case to obtain a stateid.
2690  *
2691  * Got race?
2692  * Because OPEN is always done by name in nfsv4, it is
2693  * possible that we opened a different file by the same
2694  * name.  We can recognize this race condition, but we
2695  * can't do anything about it besides returning an error.
2696  *
2697  * This will be fixed with VFS changes (lookup-intent).
2698  */
2699 static int
2700 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2701                   struct iattr *sattr)
2702 {
2703         struct inode *inode = dentry->d_inode;
2704         struct rpc_cred *cred = NULL;
2705         struct nfs4_state *state = NULL;
2706         int status;
2707
2708         if (pnfs_ld_layoutret_on_setattr(inode))
2709                 pnfs_return_layout(inode);
2710
2711         nfs_fattr_init(fattr);
2712
2713         /* Deal with open(O_TRUNC) */
2714         if (sattr->ia_valid & ATTR_OPEN)
2715                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2716
2717         /* Optimization: if the end result is no change, don't RPC */
2718         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2719                 return 0;
2720
2721         /* Search for an existing open(O_WRITE) file */
2722         if (sattr->ia_valid & ATTR_FILE) {
2723                 struct nfs_open_context *ctx;
2724
2725                 ctx = nfs_file_open_context(sattr->ia_file);
2726                 if (ctx) {
2727                         cred = ctx->cred;
2728                         state = ctx->state;
2729                 }
2730         }
2731
2732         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2733         if (status == 0)
2734                 nfs_setattr_update_inode(inode, sattr);
2735         return status;
2736 }
2737
2738 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2739                 const struct qstr *name, struct nfs_fh *fhandle,
2740                 struct nfs_fattr *fattr)
2741 {
2742         struct nfs_server *server = NFS_SERVER(dir);
2743         int                    status;
2744         struct nfs4_lookup_arg args = {
2745                 .bitmask = server->attr_bitmask,
2746                 .dir_fh = NFS_FH(dir),
2747                 .name = name,
2748         };
2749         struct nfs4_lookup_res res = {
2750                 .server = server,
2751                 .fattr = fattr,
2752                 .fh = fhandle,
2753         };
2754         struct rpc_message msg = {
2755                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2756                 .rpc_argp = &args,
2757                 .rpc_resp = &res,
2758         };
2759
2760         nfs_fattr_init(fattr);
2761
2762         dprintk("NFS call  lookup %s\n", name->name);
2763         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2764         dprintk("NFS reply lookup: %d\n", status);
2765         return status;
2766 }
2767
2768 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2769 {
2770         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2771                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2772         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2773         fattr->nlink = 2;
2774 }
2775
2776 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2777                                    struct qstr *name, struct nfs_fh *fhandle,
2778                                    struct nfs_fattr *fattr)
2779 {
2780         struct nfs4_exception exception = { };
2781         struct rpc_clnt *client = *clnt;
2782         int err;
2783         do {
2784                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2785                 switch (err) {
2786                 case -NFS4ERR_BADNAME:
2787                         err = -ENOENT;
2788                         goto out;
2789                 case -NFS4ERR_MOVED:
2790                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2791                         goto out;
2792                 case -NFS4ERR_WRONGSEC:
2793                         err = -EPERM;
2794                         if (client != *clnt)
2795                                 goto out;
2796
2797                         client = nfs4_create_sec_client(client, dir, name);
2798                         if (IS_ERR(client))
2799                                 return PTR_ERR(client);
2800
2801                         exception.retry = 1;
2802                         break;
2803                 default:
2804                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2805                 }
2806         } while (exception.retry);
2807
2808 out:
2809         if (err == 0)
2810                 *clnt = client;
2811         else if (client != *clnt)
2812                 rpc_shutdown_client(client);
2813
2814         return err;
2815 }
2816
2817 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2818                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2819 {
2820         int status;
2821         struct rpc_clnt *client = NFS_CLIENT(dir);
2822
2823         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2824         if (client != NFS_CLIENT(dir)) {
2825                 rpc_shutdown_client(client);
2826                 nfs_fixup_secinfo_attributes(fattr);
2827         }
2828         return status;
2829 }
2830
2831 struct rpc_clnt *
2832 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2833                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2834 {
2835         int status;
2836         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2837
2838         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2839         if (status < 0) {
2840                 rpc_shutdown_client(client);
2841                 return ERR_PTR(status);
2842         }
2843         return client;
2844 }
2845
2846 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2847 {
2848         struct nfs_server *server = NFS_SERVER(inode);
2849         struct nfs4_accessargs args = {
2850                 .fh = NFS_FH(inode),
2851                 .bitmask = server->cache_consistency_bitmask,
2852         };
2853         struct nfs4_accessres res = {
2854                 .server = server,
2855         };
2856         struct rpc_message msg = {
2857                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2858                 .rpc_argp = &args,
2859                 .rpc_resp = &res,
2860                 .rpc_cred = entry->cred,
2861         };
2862         int mode = entry->mask;
2863         int status;
2864
2865         /*
2866          * Determine which access bits we want to ask for...
2867          */
2868         if (mode & MAY_READ)
2869                 args.access |= NFS4_ACCESS_READ;
2870         if (S_ISDIR(inode->i_mode)) {
2871                 if (mode & MAY_WRITE)
2872                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2873                 if (mode & MAY_EXEC)
2874                         args.access |= NFS4_ACCESS_LOOKUP;
2875         } else {
2876                 if (mode & MAY_WRITE)
2877                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2878                 if (mode & MAY_EXEC)
2879                         args.access |= NFS4_ACCESS_EXECUTE;
2880         }
2881
2882         res.fattr = nfs_alloc_fattr();
2883         if (res.fattr == NULL)
2884                 return -ENOMEM;
2885
2886         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2887         if (!status) {
2888                 nfs_access_set_mask(entry, res.access);
2889                 nfs_refresh_inode(inode, res.fattr);
2890         }
2891         nfs_free_fattr(res.fattr);
2892         return status;
2893 }
2894
2895 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2896 {
2897         struct nfs4_exception exception = { };
2898         int err;
2899         do {
2900                 err = nfs4_handle_exception(NFS_SERVER(inode),
2901                                 _nfs4_proc_access(inode, entry),
2902                                 &exception);
2903         } while (exception.retry);
2904         return err;
2905 }
2906
2907 /*
2908  * TODO: For the time being, we don't try to get any attributes
2909  * along with any of the zero-copy operations READ, READDIR,
2910  * READLINK, WRITE.
2911  *
2912  * In the case of the first three, we want to put the GETATTR
2913  * after the read-type operation -- this is because it is hard
2914  * to predict the length of a GETATTR response in v4, and thus
2915  * align the READ data correctly.  This means that the GETATTR
2916  * may end up partially falling into the page cache, and we should
2917  * shift it into the 'tail' of the xdr_buf before processing.
2918  * To do this efficiently, we need to know the total length
2919  * of data received, which doesn't seem to be available outside
2920  * of the RPC layer.
2921  *
2922  * In the case of WRITE, we also want to put the GETATTR after
2923  * the operation -- in this case because we want to make sure
2924  * we get the post-operation mtime and size.
2925  *
2926  * Both of these changes to the XDR layer would in fact be quite
2927  * minor, but I decided to leave them for a subsequent patch.
2928  */
2929 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2930                 unsigned int pgbase, unsigned int pglen)
2931 {
2932         struct nfs4_readlink args = {
2933                 .fh       = NFS_FH(inode),
2934                 .pgbase   = pgbase,
2935                 .pglen    = pglen,
2936                 .pages    = &page,
2937         };
2938         struct nfs4_readlink_res res;
2939         struct rpc_message msg = {
2940                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2941                 .rpc_argp = &args,
2942                 .rpc_resp = &res,
2943         };
2944
2945         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2946 }
2947
2948 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2949                 unsigned int pgbase, unsigned int pglen)
2950 {
2951         struct nfs4_exception exception = { };
2952         int err;
2953         do {
2954                 err = nfs4_handle_exception(NFS_SERVER(inode),
2955                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2956                                 &exception);
2957         } while (exception.retry);
2958         return err;
2959 }
2960
2961 /*
2962  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2963  */
2964 static int
2965 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2966                  int flags)
2967 {
2968         struct nfs_open_context *ctx;
2969         struct nfs4_state *state;
2970         int status = 0;
2971
2972         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2973         if (IS_ERR(ctx))
2974                 return PTR_ERR(ctx);
2975
2976         sattr->ia_mode &= ~current_umask();
2977         state = nfs4_do_open(dir, dentry, ctx->mode,
2978                         flags, sattr, ctx->cred,
2979                         &ctx->mdsthreshold);
2980         d_drop(dentry);
2981         if (IS_ERR(state)) {
2982                 status = PTR_ERR(state);
2983                 goto out;
2984         }
2985         d_add(dentry, igrab(state->inode));
2986         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2987         ctx->state = state;
2988 out:
2989         put_nfs_open_context(ctx);
2990         return status;
2991 }
2992
2993 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2994 {
2995         struct nfs_server *server = NFS_SERVER(dir);
2996         struct nfs_removeargs args = {
2997                 .fh = NFS_FH(dir),
2998                 .name = *name,
2999         };
3000         struct nfs_removeres res = {
3001                 .server = server,
3002         };
3003         struct rpc_message msg = {
3004                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3005                 .rpc_argp = &args,
3006                 .rpc_resp = &res,
3007         };
3008         int status;
3009
3010         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3011         if (status == 0)
3012                 update_changeattr(dir, &res.cinfo);
3013         return status;
3014 }
3015
3016 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3017 {
3018         struct nfs4_exception exception = { };
3019         int err;
3020         do {
3021                 err = nfs4_handle_exception(NFS_SERVER(dir),
3022                                 _nfs4_proc_remove(dir, name),
3023                                 &exception);
3024         } while (exception.retry);
3025         return err;
3026 }
3027
3028 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3029 {
3030         struct nfs_server *server = NFS_SERVER(dir);
3031         struct nfs_removeargs *args = msg->rpc_argp;
3032         struct nfs_removeres *res = msg->rpc_resp;
3033
3034         res->server = server;
3035         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3036         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3037 }
3038
3039 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3040 {
3041         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
3042                                 &data->args.seq_args,
3043                                 &data->res.seq_res,
3044                                 task))
3045                 return;
3046         rpc_call_start(task);
3047 }
3048
3049 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3050 {
3051         struct nfs_removeres *res = task->tk_msg.rpc_resp;
3052
3053         if (!nfs4_sequence_done(task, &res->seq_res))
3054                 return 0;
3055         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3056                 return 0;
3057         update_changeattr(dir, &res->cinfo);
3058         return 1;
3059 }
3060
3061 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3062 {
3063         struct nfs_server *server = NFS_SERVER(dir);
3064         struct nfs_renameargs *arg = msg->rpc_argp;
3065         struct nfs_renameres *res = msg->rpc_resp;
3066
3067         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3068         res->server = server;
3069         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3070 }
3071
3072 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3073 {
3074         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3075                                 &data->args.seq_args,
3076                                 &data->res.seq_res,
3077                                 task))
3078                 return;
3079         rpc_call_start(task);
3080 }
3081
3082 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3083                                  struct inode *new_dir)
3084 {
3085         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3086
3087         if (!nfs4_sequence_done(task, &res->seq_res))
3088                 return 0;
3089         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3090                 return 0;
3091
3092         update_changeattr(old_dir, &res->old_cinfo);
3093         update_changeattr(new_dir, &res->new_cinfo);
3094         return 1;
3095 }
3096
3097 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3098                 struct inode *new_dir, struct qstr *new_name)
3099 {
3100         struct nfs_server *server = NFS_SERVER(old_dir);
3101         struct nfs_renameargs arg = {
3102                 .old_dir = NFS_FH(old_dir),
3103                 .new_dir = NFS_FH(new_dir),
3104                 .old_name = old_name,
3105                 .new_name = new_name,
3106         };
3107         struct nfs_renameres res = {
3108                 .server = server,
3109         };
3110         struct rpc_message msg = {
3111                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3112                 .rpc_argp = &arg,
3113                 .rpc_resp = &res,
3114         };
3115         int status = -ENOMEM;
3116
3117         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3118         if (!status) {
3119                 update_changeattr(old_dir, &res.old_cinfo);
3120                 update_changeattr(new_dir, &res.new_cinfo);
3121         }
3122         return status;
3123 }
3124
3125 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3126                 struct inode *new_dir, struct qstr *new_name)
3127 {
3128         struct nfs4_exception exception = { };
3129         int err;
3130         do {
3131                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3132                                 _nfs4_proc_rename(old_dir, old_name,
3133                                         new_dir, new_name),
3134                                 &exception);
3135         } while (exception.retry);
3136         return err;
3137 }
3138
3139 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3140 {
3141         struct nfs_server *server = NFS_SERVER(inode);
3142         struct nfs4_link_arg arg = {
3143                 .fh     = NFS_FH(inode),
3144                 .dir_fh = NFS_FH(dir),
3145                 .name   = name,
3146                 .bitmask = server->attr_bitmask,
3147         };
3148         struct nfs4_link_res res = {
3149                 .server = server,
3150         };
3151         struct rpc_message msg = {
3152                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3153                 .rpc_argp = &arg,
3154                 .rpc_resp = &res,
3155         };
3156         int status = -ENOMEM;
3157
3158         res.fattr = nfs_alloc_fattr();
3159         if (res.fattr == NULL)
3160                 goto out;
3161
3162         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3163         if (!status) {
3164                 update_changeattr(dir, &res.cinfo);
3165                 nfs_post_op_update_inode(inode, res.fattr);
3166         }
3167 out:
3168         nfs_free_fattr(res.fattr);
3169         return status;
3170 }
3171
3172 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3173 {
3174         struct nfs4_exception exception = { };
3175         int err;
3176         do {
3177                 err = nfs4_handle_exception(NFS_SERVER(inode),
3178                                 _nfs4_proc_link(inode, dir, name),
3179                                 &exception);
3180         } while (exception.retry);
3181         return err;
3182 }
3183
3184 struct nfs4_createdata {
3185         struct rpc_message msg;
3186         struct nfs4_create_arg arg;
3187         struct nfs4_create_res res;
3188         struct nfs_fh fh;
3189         struct nfs_fattr fattr;
3190 };
3191
3192 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3193                 struct qstr *name, struct iattr *sattr, u32 ftype)
3194 {
3195         struct nfs4_createdata *data;
3196
3197         data = kzalloc(sizeof(*data), GFP_KERNEL);
3198         if (data != NULL) {
3199                 struct nfs_server *server = NFS_SERVER(dir);
3200
3201                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3202                 data->msg.rpc_argp = &data->arg;
3203                 data->msg.rpc_resp = &data->res;
3204                 data->arg.dir_fh = NFS_FH(dir);
3205                 data->arg.server = server;
3206                 data->arg.name = name;
3207                 data->arg.attrs = sattr;
3208                 data->arg.ftype = ftype;
3209                 data->arg.bitmask = server->attr_bitmask;
3210                 data->res.server = server;
3211                 data->res.fh = &data->fh;
3212                 data->res.fattr = &data->fattr;
3213                 nfs_fattr_init(data->res.fattr);
3214         }
3215         return data;
3216 }
3217
3218 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3219 {
3220         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3221                                     &data->arg.seq_args, &data->res.seq_res, 1);
3222         if (status == 0) {
3223                 update_changeattr(dir, &data->res.dir_cinfo);
3224                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3225         }
3226         return status;
3227 }
3228
3229 static void nfs4_free_createdata(struct nfs4_createdata *data)
3230 {
3231         kfree(data);
3232 }
3233
3234 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3235                 struct page *page, unsigned int len, struct iattr *sattr)
3236 {
3237         struct nfs4_createdata *data;
3238         int status = -ENAMETOOLONG;
3239
3240         if (len > NFS4_MAXPATHLEN)
3241                 goto out;
3242
3243         status = -ENOMEM;
3244         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3245         if (data == NULL)
3246                 goto out;
3247
3248         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3249         data->arg.u.symlink.pages = &page;
3250         data->arg.u.symlink.len = len;
3251
3252         status = nfs4_do_create(dir, dentry, data);
3253
3254         nfs4_free_createdata(data);
3255 out:
3256         return status;
3257 }
3258
3259 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3260                 struct page *page, unsigned int len, struct iattr *sattr)
3261 {
3262         struct nfs4_exception exception = { };
3263         int err;
3264         do {
3265                 err = nfs4_handle_exception(NFS_SERVER(dir),
3266                                 _nfs4_proc_symlink(dir, dentry, page,
3267                                                         len, sattr),
3268                                 &exception);
3269         } while (exception.retry);
3270         return err;
3271 }
3272
3273 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3274                 struct iattr *sattr)
3275 {
3276         struct nfs4_createdata *data;
3277         int status = -ENOMEM;
3278
3279         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3280         if (data == NULL)
3281                 goto out;
3282
3283         status = nfs4_do_create(dir, dentry, data);
3284
3285         nfs4_free_createdata(data);
3286 out:
3287         return status;
3288 }
3289
3290 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3291                 struct iattr *sattr)
3292 {
3293         struct nfs4_exception exception = { };
3294         int err;
3295
3296         sattr->ia_mode &= ~current_umask();
3297         do {
3298                 err = nfs4_handle_exception(NFS_SERVER(dir),
3299                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3300                                 &exception);
3301         } while (exception.retry);
3302         return err;
3303 }
3304
3305 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3306                 u64 cookie, struct page **pages, unsigned int count, int plus)
3307 {
3308         struct inode            *dir = dentry->d_inode;
3309         struct nfs4_readdir_arg args = {
3310                 .fh = NFS_FH(dir),
3311                 .pages = pages,
3312                 .pgbase = 0,
3313                 .count = count,
3314                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3315                 .plus = plus,
3316         };
3317         struct nfs4_readdir_res res;
3318         struct rpc_message msg = {
3319                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3320                 .rpc_argp = &args,
3321                 .rpc_resp = &res,
3322                 .rpc_cred = cred,
3323         };
3324         int                     status;
3325
3326         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3327                         dentry->d_parent->d_name.name,
3328                         dentry->d_name.name,
3329                         (unsigned long long)cookie);
3330         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3331         res.pgbase = args.pgbase;
3332         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3333         if (status >= 0) {
3334                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3335                 status += args.pgbase;
3336         }
3337
3338         nfs_invalidate_atime(dir);
3339
3340         dprintk("%s: returns %d\n", __func__, status);
3341         return status;
3342 }
3343
3344 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3345                 u64 cookie, struct page **pages, unsigned int count, int plus)
3346 {
3347         struct nfs4_exception exception = { };
3348         int err;
3349         do {
3350                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3351                                 _nfs4_proc_readdir(dentry, cred, cookie,
3352                                         pages, count, plus),
3353                                 &exception);
3354         } while (exception.retry);
3355         return err;
3356 }
3357
3358 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3359                 struct iattr *sattr, dev_t rdev)
3360 {
3361         struct nfs4_createdata *data;
3362         int mode = sattr->ia_mode;
3363         int status = -ENOMEM;
3364
3365         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3366         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3367
3368         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3369         if (data == NULL)
3370                 goto out;
3371
3372         if (S_ISFIFO(mode))
3373                 data->arg.ftype = NF4FIFO;
3374         else if (S_ISBLK(mode)) {
3375                 data->arg.ftype = NF4BLK;
3376                 data->arg.u.device.specdata1 = MAJOR(rdev);
3377                 data->arg.u.device.specdata2 = MINOR(rdev);
3378         }
3379         else if (S_ISCHR(mode)) {
3380                 data->arg.ftype = NF4CHR;
3381                 data->arg.u.device.specdata1 = MAJOR(rdev);
3382                 data->arg.u.device.specdata2 = MINOR(rdev);
3383         }
3384
3385         status = nfs4_do_create(dir, dentry, data);
3386
3387         nfs4_free_createdata(data);
3388 out:
3389         return status;
3390 }
3391
3392 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3393                 struct iattr *sattr, dev_t rdev)
3394 {
3395         struct nfs4_exception exception = { };
3396         int err;
3397
3398         sattr->ia_mode &= ~current_umask();
3399         do {
3400                 err = nfs4_handle_exception(NFS_SERVER(dir),
3401                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3402                                 &exception);
3403         } while (exception.retry);
3404         return err;
3405 }
3406
3407 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3408                  struct nfs_fsstat *fsstat)
3409 {
3410         struct nfs4_statfs_arg args = {
3411                 .fh = fhandle,
3412                 .bitmask = server->attr_bitmask,
3413         };
3414         struct nfs4_statfs_res res = {
3415                 .fsstat = fsstat,
3416         };
3417         struct rpc_message msg = {
3418                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3419                 .rpc_argp = &args,
3420                 .rpc_resp = &res,
3421         };
3422
3423         nfs_fattr_init(fsstat->fattr);
3424         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3425 }
3426
3427 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3428 {
3429         struct nfs4_exception exception = { };
3430         int err;
3431         do {
3432                 err = nfs4_handle_exception(server,
3433                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3434                                 &exception);
3435         } while (exception.retry);
3436         return err;
3437 }
3438
3439 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3440                 struct nfs_fsinfo *fsinfo)
3441 {
3442         struct nfs4_fsinfo_arg args = {
3443                 .fh = fhandle,
3444                 .bitmask = server->attr_bitmask,
3445         };
3446         struct nfs4_fsinfo_res res = {
3447                 .fsinfo = fsinfo,
3448         };
3449         struct rpc_message msg = {
3450                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3451                 .rpc_argp = &args,
3452                 .rpc_resp = &res,
3453         };
3454
3455         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3456 }
3457
3458 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3459 {
3460         struct nfs4_exception exception = { };
3461         int err;
3462
3463         do {
3464                 err = nfs4_handle_exception(server,
3465                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3466                                 &exception);
3467         } while (exception.retry);
3468         return err;
3469 }
3470
3471 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3472 {
3473         int error;
3474
3475         nfs_fattr_init(fsinfo->fattr);
3476         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3477         if (error == 0) {
3478                 /* block layout checks this! */
3479                 server->pnfs_blksize = fsinfo->blksize;
3480                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3481         }
3482
3483         return error;
3484 }
3485
3486 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3487                 struct nfs_pathconf *pathconf)
3488 {
3489         struct nfs4_pathconf_arg args = {
3490                 .fh = fhandle,
3491                 .bitmask = server->attr_bitmask,
3492         };
3493         struct nfs4_pathconf_res res = {
3494                 .pathconf = pathconf,
3495         };
3496         struct rpc_message msg = {
3497                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3498                 .rpc_argp = &args,
3499                 .rpc_resp = &res,
3500         };
3501
3502         /* None of the pathconf attributes are mandatory to implement */
3503         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3504                 memset(pathconf, 0, sizeof(*pathconf));
3505                 return 0;
3506         }
3507
3508         nfs_fattr_init(pathconf->fattr);
3509         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3510 }
3511
3512 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3513                 struct nfs_pathconf *pathconf)
3514 {
3515         struct nfs4_exception exception = { };
3516         int err;
3517
3518         do {
3519                 err = nfs4_handle_exception(server,
3520                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3521                                 &exception);
3522         } while (exception.retry);
3523         return err;
3524 }
3525
3526 void __nfs4_read_done_cb(struct nfs_read_data *data)
3527 {
3528         nfs_invalidate_atime(data->header->inode);
3529 }
3530
3531 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3532 {
3533         struct nfs_server *server = NFS_SERVER(data->header->inode);
3534
3535         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3536                 rpc_restart_call_prepare(task);
3537                 return -EAGAIN;
3538         }
3539
3540         __nfs4_read_done_cb(data);
3541         if (task->tk_status > 0)
3542                 renew_lease(server, data->timestamp);
3543         return 0;
3544 }
3545
3546 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3547 {
3548
3549         dprintk("--> %s\n", __func__);
3550
3551         if (!nfs4_sequence_done(task, &data->res.seq_res))
3552                 return -EAGAIN;
3553
3554         return data->read_done_cb ? data->read_done_cb(task, data) :
3555                                     nfs4_read_done_cb(task, data);
3556 }
3557
3558 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3559 {
3560         data->timestamp   = jiffies;
3561         data->read_done_cb = nfs4_read_done_cb;
3562         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3563         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3564 }
3565
3566 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3567 {
3568         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3569                                 &data->args.seq_args,
3570                                 &data->res.seq_res,
3571                                 task))
3572                 return;
3573         rpc_call_start(task);
3574 }
3575
3576 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3577 {
3578         struct inode *inode = data->header->inode;
3579
3580         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3581                 rpc_restart_call_prepare(task);
3582                 return -EAGAIN;
3583         }
3584         if (task->tk_status >= 0) {
3585                 renew_lease(NFS_SERVER(inode), data->timestamp);
3586                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3587         }
3588         return 0;
3589 }
3590
3591 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3592 {
3593         if (!nfs4_sequence_done(task, &data->res.seq_res))
3594                 return -EAGAIN;
3595         return data->write_done_cb ? data->write_done_cb(task, data) :
3596                 nfs4_write_done_cb(task, data);
3597 }
3598
3599 static
3600 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3601 {
3602         const struct nfs_pgio_header *hdr = data->header;
3603
3604         /* Don't request attributes for pNFS or O_DIRECT writes */
3605         if (data->ds_clp != NULL || hdr->dreq != NULL)
3606                 return false;
3607         /* Otherwise, request attributes if and only if we don't hold
3608          * a delegation
3609          */
3610         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3611 }
3612
3613 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3614 {
3615         struct nfs_server *server = NFS_SERVER(data->header->inode);
3616
3617         if (!nfs4_write_need_cache_consistency_data(data)) {
3618                 data->args.bitmask = NULL;
3619                 data->res.fattr = NULL;
3620         } else
3621                 data->args.bitmask = server->cache_consistency_bitmask;
3622
3623         if (!data->write_done_cb)
3624                 data->write_done_cb = nfs4_write_done_cb;
3625         data->res.server = server;
3626         data->timestamp   = jiffies;
3627
3628         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3629         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3630 }
3631
3632 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3633 {
3634         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3635                                 &data->args.seq_args,
3636                                 &data->res.seq_res,
3637                                 task))
3638                 return;
3639         rpc_call_start(task);
3640 }
3641
3642 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3643 {
3644         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3645                                 &data->args.seq_args,
3646                                 &data->res.seq_res,
3647                                 task))
3648                 return;
3649         rpc_call_start(task);
3650 }
3651
3652 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3653 {
3654         struct inode *inode = data->inode;
3655
3656         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3657                 rpc_restart_call_prepare(task);
3658                 return -EAGAIN;
3659         }
3660         return 0;
3661 }
3662
3663 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3664 {
3665         if (!nfs4_sequence_done(task, &data->res.seq_res))
3666                 return -EAGAIN;
3667         return data->commit_done_cb(task, data);
3668 }
3669
3670 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3671 {
3672         struct nfs_server *server = NFS_SERVER(data->inode);
3673
3674         if (data->commit_done_cb == NULL)
3675                 data->commit_done_cb = nfs4_commit_done_cb;
3676         data->res.server = server;
3677         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3678         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3679 }
3680
3681 struct nfs4_renewdata {
3682         struct nfs_client       *client;
3683         unsigned long           timestamp;
3684 };
3685
3686 /*
3687  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3688  * standalone procedure for queueing an asynchronous RENEW.
3689  */
3690 static void nfs4_renew_release(void *calldata)
3691 {
3692         struct nfs4_renewdata *data = calldata;
3693         struct nfs_client *clp = data->client;
3694
3695         if (atomic_read(&clp->cl_count) > 1)
3696                 nfs4_schedule_state_renewal(clp);
3697         nfs_put_client(clp);
3698         kfree(data);
3699 }
3700
3701 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3702 {
3703         struct nfs4_renewdata *data = calldata;
3704         struct nfs_client *clp = data->client;
3705         unsigned long timestamp = data->timestamp;
3706
3707         if (task->tk_status < 0) {
3708                 /* Unless we're shutting down, schedule state recovery! */
3709                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3710                         return;
3711                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3712                         nfs4_schedule_lease_recovery(clp);
3713                         return;
3714                 }
3715                 nfs4_schedule_path_down_recovery(clp);
3716         }
3717         do_renew_lease(clp, timestamp);
3718 }
3719
3720 static const struct rpc_call_ops nfs4_renew_ops = {
3721         .rpc_call_done = nfs4_renew_done,
3722         .rpc_release = nfs4_renew_release,
3723 };
3724
3725 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3726 {
3727         struct rpc_message msg = {
3728                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3729                 .rpc_argp       = clp,
3730                 .rpc_cred       = cred,
3731         };
3732         struct nfs4_renewdata *data;
3733
3734         if (renew_flags == 0)
3735                 return 0;
3736         if (!atomic_inc_not_zero(&clp->cl_count))
3737                 return -EIO;
3738         data = kmalloc(sizeof(*data), GFP_NOFS);
3739         if (data == NULL)
3740                 return -ENOMEM;
3741         data->client = clp;
3742         data->timestamp = jiffies;
3743         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3744                         &nfs4_renew_ops, data);
3745 }
3746
3747 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3748 {
3749         struct rpc_message msg = {
3750                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3751                 .rpc_argp       = clp,
3752                 .rpc_cred       = cred,
3753         };
3754         unsigned long now = jiffies;
3755         int status;
3756
3757         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3758         if (status < 0)
3759                 return status;
3760         do_renew_lease(clp, now);
3761         return 0;
3762 }
3763
3764 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3765 {
3766         return (server->caps & NFS_CAP_ACLS)
3767                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3768                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3769 }
3770
3771 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3772  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3773  * the stack.
3774  */
3775 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3776
3777 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3778                 struct page **pages, unsigned int *pgbase)
3779 {
3780         struct page *newpage, **spages;
3781         int rc = 0;
3782         size_t len;
3783         spages = pages;
3784
3785         do {
3786                 len = min_t(size_t, PAGE_SIZE, buflen);
3787                 newpage = alloc_page(GFP_KERNEL);
3788
3789                 if (newpage == NULL)
3790                         goto unwind;
3791                 memcpy(page_address(newpage), buf, len);
3792                 buf += len;
3793                 buflen -= len;
3794                 *pages++ = newpage;
3795                 rc++;
3796         } while (buflen != 0);
3797
3798         return rc;
3799
3800 unwind:
3801         for(; rc > 0; rc--)
3802                 __free_page(spages[rc-1]);
3803         return -ENOMEM;
3804 }
3805
3806 struct nfs4_cached_acl {
3807         int cached;
3808         size_t len;
3809         char data[0];
3810 };
3811
3812 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3813 {
3814         struct nfs_inode *nfsi = NFS_I(inode);
3815
3816         spin_lock(&inode->i_lock);
3817         kfree(nfsi->nfs4_acl);
3818         nfsi->nfs4_acl = acl;
3819         spin_unlock(&inode->i_lock);
3820 }
3821
3822 static void nfs4_zap_acl_attr(struct inode *inode)
3823 {
3824         nfs4_set_cached_acl(inode, NULL);
3825 }
3826
3827 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3828 {
3829         struct nfs_inode *nfsi = NFS_I(inode);
3830         struct nfs4_cached_acl *acl;
3831         int ret = -ENOENT;
3832
3833         spin_lock(&inode->i_lock);
3834         acl = nfsi->nfs4_acl;
3835         if (acl == NULL)
3836                 goto out;
3837         if (buf == NULL) /* user is just asking for length */
3838                 goto out_len;
3839         if (acl->cached == 0)
3840                 goto out;
3841         ret = -ERANGE; /* see getxattr(2) man page */
3842         if (acl->len > buflen)
3843                 goto out;
3844         memcpy(buf, acl->data, acl->len);
3845 out_len:
3846         ret = acl->len;
3847 out:
3848         spin_unlock(&inode->i_lock);
3849         return ret;
3850 }
3851
3852 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3853 {
3854         struct nfs4_cached_acl *acl;
3855         size_t buflen = sizeof(*acl) + acl_len;
3856
3857         if (buflen <= PAGE_SIZE) {
3858                 acl = kmalloc(buflen, GFP_KERNEL);
3859                 if (acl == NULL)
3860                         goto out;
3861                 acl->cached = 1;
3862                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3863         } else {
3864                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3865                 if (acl == NULL)
3866                         goto out;
3867                 acl->cached = 0;
3868         }
3869         acl->len = acl_len;
3870 out:
3871         nfs4_set_cached_acl(inode, acl);
3872 }
3873
3874 /*
3875  * The getxattr API returns the required buffer length when called with a
3876  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3877  * the required buf.  On a NULL buf, we send a page of data to the server
3878  * guessing that the ACL request can be serviced by a page. If so, we cache
3879  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3880  * the cache. If not so, we throw away the page, and cache the required
3881  * length. The next getxattr call will then produce another round trip to
3882  * the server, this time with the input buf of the required size.
3883  */
3884 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3885 {
3886         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3887         struct nfs_getaclargs args = {
3888                 .fh = NFS_FH(inode),
3889                 .acl_pages = pages,
3890                 .acl_len = buflen,
3891         };
3892         struct nfs_getaclres res = {
3893                 .acl_len = buflen,
3894         };
3895         struct rpc_message msg = {
3896                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3897                 .rpc_argp = &args,
3898                 .rpc_resp = &res,
3899         };
3900         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3901         int ret = -ENOMEM, i;
3902
3903         /* As long as we're doing a round trip to the server anyway,
3904          * let's be prepared for a page of acl data. */
3905         if (npages == 0)
3906                 npages = 1;
3907         if (npages > ARRAY_SIZE(pages))
3908                 return -ERANGE;
3909
3910         for (i = 0; i < npages; i++) {
3911                 pages[i] = alloc_page(GFP_KERNEL);
3912                 if (!pages[i])
3913                         goto out_free;
3914         }
3915
3916         /* for decoding across pages */
3917         res.acl_scratch = alloc_page(GFP_KERNEL);
3918         if (!res.acl_scratch)
3919                 goto out_free;
3920
3921         args.acl_len = npages * PAGE_SIZE;
3922         args.acl_pgbase = 0;
3923
3924         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3925                 __func__, buf, buflen, npages, args.acl_len);
3926         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3927                              &msg, &args.seq_args, &res.seq_res, 0);
3928         if (ret)
3929                 goto out_free;
3930
3931         /* Handle the case where the passed-in buffer is too short */
3932         if (res.acl_flags & NFS4_ACL_TRUNC) {
3933                 /* Did the user only issue a request for the acl length? */
3934                 if (buf == NULL)
3935                         goto out_ok;
3936                 ret = -ERANGE;
3937                 goto out_free;
3938         }
3939         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3940         if (buf)
3941                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3942 out_ok:
3943         ret = res.acl_len;
3944 out_free:
3945         for (i = 0; i < npages; i++)
3946                 if (pages[i])
3947                         __free_page(pages[i]);
3948         if (res.acl_scratch)
3949                 __free_page(res.acl_scratch);
3950         return ret;
3951 }
3952
3953 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3954 {
3955         struct nfs4_exception exception = { };
3956         ssize_t ret;
3957         do {
3958                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3959                 if (ret >= 0)
3960                         break;
3961                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3962         } while (exception.retry);
3963         return ret;
3964 }
3965
3966 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3967 {
3968         struct nfs_server *server = NFS_SERVER(inode);
3969         int ret;
3970
3971         if (!nfs4_server_supports_acls(server))
3972                 return -EOPNOTSUPP;
3973         ret = nfs_revalidate_inode(server, inode);
3974         if (ret < 0)
3975                 return ret;
3976         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3977                 nfs_zap_acl_cache(inode);
3978         ret = nfs4_read_cached_acl(inode, buf, buflen);
3979         if (ret != -ENOENT)
3980                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3981                  * but no cached acl data, just the acl length */
3982                 return ret;
3983         return nfs4_get_acl_uncached(inode, buf, buflen);
3984 }
3985
3986 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3987 {
3988         struct nfs_server *server = NFS_SERVER(inode);
3989         struct page *pages[NFS4ACL_MAXPAGES];
3990         struct nfs_setaclargs arg = {
3991                 .fh             = NFS_FH(inode),
3992                 .acl_pages      = pages,
3993                 .acl_len        = buflen,
3994         };
3995         struct nfs_setaclres res;
3996         struct rpc_message msg = {
3997                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3998                 .rpc_argp       = &arg,
3999                 .rpc_resp       = &res,
4000         };
4001         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4002         int ret, i;
4003
4004         if (!nfs4_server_supports_acls(server))
4005                 return -EOPNOTSUPP;
4006         if (npages > ARRAY_SIZE(pages))
4007                 return -ERANGE;
4008         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4009         if (i < 0)
4010                 return i;
4011         nfs4_inode_return_delegation(inode);
4012         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4013
4014         /*
4015          * Free each page after tx, so the only ref left is
4016          * held by the network stack
4017          */
4018         for (; i > 0; i--)
4019                 put_page(pages[i-1]);
4020
4021         /*
4022          * Acl update can result in inode attribute update.
4023          * so mark the attribute cache invalid.
4024          */
4025         spin_lock(&inode->i_lock);
4026         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4027         spin_unlock(&inode->i_lock);
4028         nfs_access_zap_cache(inode);
4029         nfs_zap_acl_cache(inode);
4030         return ret;
4031 }
4032
4033 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4034 {
4035         struct nfs4_exception exception = { };
4036         int err;
4037         do {
4038                 err = nfs4_handle_exception(NFS_SERVER(inode),
4039                                 __nfs4_proc_set_acl(inode, buf, buflen),
4040                                 &exception);
4041         } while (exception.retry);
4042         return err;
4043 }
4044
4045 static int
4046 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4047 {
4048         struct nfs_client *clp = server->nfs_client;
4049
4050         if (task->tk_status >= 0)
4051                 return 0;
4052         switch(task->tk_status) {
4053                 case -NFS4ERR_DELEG_REVOKED:
4054                 case -NFS4ERR_ADMIN_REVOKED:
4055                 case -NFS4ERR_BAD_STATEID:
4056                         if (state == NULL)
4057                                 break;
4058                         nfs_remove_bad_delegation(state->inode);
4059                 case -NFS4ERR_OPENMODE:
4060                         if (state == NULL)
4061                                 break;
4062                         nfs4_schedule_stateid_recovery(server, state);
4063                         goto wait_on_recovery;
4064                 case -NFS4ERR_EXPIRED:
4065                         if (state != NULL)
4066                                 nfs4_schedule_stateid_recovery(server, state);
4067                 case -NFS4ERR_STALE_STATEID:
4068                 case -NFS4ERR_STALE_CLIENTID:
4069                         nfs4_schedule_lease_recovery(clp);
4070                         goto wait_on_recovery;
4071 #if defined(CONFIG_NFS_V4_1)
4072                 case -NFS4ERR_BADSESSION:
4073                 case -NFS4ERR_BADSLOT:
4074                 case -NFS4ERR_BAD_HIGH_SLOT:
4075                 case -NFS4ERR_DEADSESSION:
4076                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4077                 case -NFS4ERR_SEQ_FALSE_RETRY:
4078                 case -NFS4ERR_SEQ_MISORDERED:
4079                         dprintk("%s ERROR %d, Reset session\n", __func__,
4080                                 task->tk_status);
4081                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4082                         task->tk_status = 0;
4083                         return -EAGAIN;
4084 #endif /* CONFIG_NFS_V4_1 */
4085                 case -NFS4ERR_DELAY:
4086                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4087                 case -NFS4ERR_GRACE:
4088                 case -EKEYEXPIRED:
4089                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4090                         task->tk_status = 0;
4091                         return -EAGAIN;
4092                 case -NFS4ERR_RETRY_UNCACHED_REP:
4093                 case -NFS4ERR_OLD_STATEID:
4094                         task->tk_status = 0;
4095                         return -EAGAIN;
4096         }
4097         task->tk_status = nfs4_map_errors(task->tk_status);
4098         return 0;
4099 wait_on_recovery:
4100         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4101         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4102                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4103         task->tk_status = 0;
4104         return -EAGAIN;
4105 }
4106
4107 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4108                                     nfs4_verifier *bootverf)
4109 {
4110         __be32 verf[2];
4111
4112         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4113                 /* An impossible timestamp guarantees this value
4114                  * will never match a generated boot time. */
4115                 verf[0] = 0;
4116                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4117         } else {
4118                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4119                 verf[0] = (__be32)nn->boot_time.tv_sec;
4120                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4121         }
4122         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4123 }
4124
4125 static unsigned int
4126 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4127                                    char *buf, size_t len)
4128 {
4129         unsigned int result;
4130
4131         rcu_read_lock();
4132         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4133                                 clp->cl_ipaddr,
4134                                 rpc_peeraddr2str(clp->cl_rpcclient,
4135                                                         RPC_DISPLAY_ADDR),
4136                                 rpc_peeraddr2str(clp->cl_rpcclient,
4137                                                         RPC_DISPLAY_PROTO));
4138         rcu_read_unlock();
4139         return result;
4140 }
4141
4142 static unsigned int
4143 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4144                                 char *buf, size_t len)
4145 {
4146         char *nodename = clp->cl_rpcclient->cl_nodename;
4147
4148         if (nfs4_client_id_uniquifier[0] != '\0')
4149                 nodename = nfs4_client_id_uniquifier;
4150         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4151                                 clp->rpc_ops->version, clp->cl_minorversion,
4152                                 nodename);
4153 }
4154
4155 /**
4156  * nfs4_proc_setclientid - Negotiate client ID
4157  * @clp: state data structure
4158  * @program: RPC program for NFSv4 callback service
4159  * @port: IP port number for NFS4 callback service
4160  * @cred: RPC credential to use for this call
4161  * @res: where to place the result
4162  *
4163  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4164  */
4165 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4166                 unsigned short port, struct rpc_cred *cred,
4167                 struct nfs4_setclientid_res *res)
4168 {
4169         nfs4_verifier sc_verifier;
4170         struct nfs4_setclientid setclientid = {
4171                 .sc_verifier = &sc_verifier,
4172                 .sc_prog = program,
4173                 .sc_cb_ident = clp->cl_cb_ident,
4174         };
4175         struct rpc_message msg = {
4176                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4177                 .rpc_argp = &setclientid,
4178                 .rpc_resp = res,
4179                 .rpc_cred = cred,
4180         };
4181         int status;
4182
4183         /* nfs_client_id4 */
4184         nfs4_init_boot_verifier(clp, &sc_verifier);
4185         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4186                 setclientid.sc_name_len =
4187                                 nfs4_init_uniform_client_string(clp,
4188                                                 setclientid.sc_name,
4189                                                 sizeof(setclientid.sc_name));
4190         else
4191                 setclientid.sc_name_len =
4192                                 nfs4_init_nonuniform_client_string(clp,
4193                                                 setclientid.sc_name,
4194                                                 sizeof(setclientid.sc_name));
4195         /* cb_client4 */
4196         rcu_read_lock();
4197         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4198                                 sizeof(setclientid.sc_netid),
4199                                 rpc_peeraddr2str(clp->cl_rpcclient,
4200                                                         RPC_DISPLAY_NETID));
4201         rcu_read_unlock();
4202         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4203                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4204                                 clp->cl_ipaddr, port >> 8, port & 255);
4205
4206         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4207                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4208                 setclientid.sc_name_len, setclientid.sc_name);
4209         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4210         dprintk("NFS reply setclientid: %d\n", status);
4211         return status;
4212 }
4213
4214 /**
4215  * nfs4_proc_setclientid_confirm - Confirm client ID
4216  * @clp: state data structure
4217  * @res: result of a previous SETCLIENTID
4218  * @cred: RPC credential to use for this call
4219  *
4220  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4221  */
4222 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4223                 struct nfs4_setclientid_res *arg,
4224                 struct rpc_cred *cred)
4225 {
4226         struct nfs_fsinfo fsinfo;
4227         struct rpc_message msg = {
4228                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4229                 .rpc_argp = arg,
4230                 .rpc_resp = &fsinfo,
4231                 .rpc_cred = cred,
4232         };
4233         unsigned long now;
4234         int status;
4235
4236         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4237                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4238                 clp->cl_clientid);
4239         now = jiffies;
4240         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4241         if (status == 0) {
4242                 spin_lock(&clp->cl_lock);
4243                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4244                 clp->cl_last_renewal = now;
4245                 spin_unlock(&clp->cl_lock);
4246         }
4247         dprintk("NFS reply setclientid_confirm: %d\n", status);
4248         return status;
4249 }
4250
4251 struct nfs4_delegreturndata {
4252         struct nfs4_delegreturnargs args;
4253         struct nfs4_delegreturnres res;
4254         struct nfs_fh fh;
4255         nfs4_stateid stateid;
4256         unsigned long timestamp;
4257         struct nfs_fattr fattr;
4258         int rpc_status;
4259 };
4260
4261 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4262 {
4263         struct nfs4_delegreturndata *data = calldata;
4264
4265         if (!nfs4_sequence_done(task, &data->res.seq_res))
4266                 return;
4267
4268         switch (task->tk_status) {
4269         case -NFS4ERR_STALE_STATEID:
4270         case -NFS4ERR_EXPIRED:
4271         case 0:
4272                 renew_lease(data->res.server, data->timestamp);
4273                 break;
4274         default:
4275                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4276                                 -EAGAIN) {
4277                         rpc_restart_call_prepare(task);
4278                         return;
4279                 }
4280         }
4281         data->rpc_status = task->tk_status;
4282 }
4283
4284 static void nfs4_delegreturn_release(void *calldata)
4285 {
4286         kfree(calldata);
4287 }
4288
4289 #if defined(CONFIG_NFS_V4_1)
4290 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4291 {
4292         struct nfs4_delegreturndata *d_data;
4293
4294         d_data = (struct nfs4_delegreturndata *)data;
4295
4296         if (nfs4_setup_sequence(d_data->res.server,
4297                                 &d_data->args.seq_args,
4298                                 &d_data->res.seq_res, task))
4299                 return;
4300         rpc_call_start(task);
4301 }
4302 #endif /* CONFIG_NFS_V4_1 */
4303
4304 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4305 #if defined(CONFIG_NFS_V4_1)
4306         .rpc_call_prepare = nfs4_delegreturn_prepare,
4307 #endif /* CONFIG_NFS_V4_1 */
4308         .rpc_call_done = nfs4_delegreturn_done,
4309         .rpc_release = nfs4_delegreturn_release,
4310 };
4311
4312 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4313 {
4314         struct nfs4_delegreturndata *data;
4315         struct nfs_server *server = NFS_SERVER(inode);
4316         struct rpc_task *task;
4317         struct rpc_message msg = {
4318                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4319                 .rpc_cred = cred,
4320         };
4321         struct rpc_task_setup task_setup_data = {
4322                 .rpc_client = server->client,
4323                 .rpc_message = &msg,
4324                 .callback_ops = &nfs4_delegreturn_ops,
4325                 .flags = RPC_TASK_ASYNC,
4326         };
4327         int status = 0;
4328
4329         data = kzalloc(sizeof(*data), GFP_NOFS);
4330         if (data == NULL)
4331                 return -ENOMEM;
4332         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4333         data->args.fhandle = &data->fh;
4334         data->args.stateid = &data->stateid;
4335         data->args.bitmask = server->cache_consistency_bitmask;
4336         nfs_copy_fh(&data->fh, NFS_FH(inode));
4337         nfs4_stateid_copy(&data->stateid, stateid);
4338         data->res.fattr = &data->fattr;
4339         data->res.server = server;
4340         nfs_fattr_init(data->res.fattr);
4341         data->timestamp = jiffies;
4342         data->rpc_status = 0;
4343
4344         task_setup_data.callback_data = data;
4345         msg.rpc_argp = &data->args;
4346         msg.rpc_resp = &data->res;
4347         task = rpc_run_task(&task_setup_data);
4348         if (IS_ERR(task))
4349                 return PTR_ERR(task);
4350         if (!issync)
4351                 goto out;
4352         status = nfs4_wait_for_completion_rpc_task(task);
4353         if (status != 0)
4354                 goto out;
4355         status = data->rpc_status;
4356         if (status == 0)
4357                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4358         else
4359                 nfs_refresh_inode(inode, &data->fattr);
4360 out:
4361         rpc_put_task(task);
4362         return status;
4363 }
4364
4365 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4366 {
4367         struct nfs_server *server = NFS_SERVER(inode);
4368         struct nfs4_exception exception = { };
4369         int err;
4370         do {
4371                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4372                 switch (err) {
4373                         case -NFS4ERR_STALE_STATEID:
4374                         case -NFS4ERR_EXPIRED:
4375                         case 0:
4376                                 return 0;
4377                 }
4378                 err = nfs4_handle_exception(server, err, &exception);
4379         } while (exception.retry);
4380         return err;
4381 }
4382
4383 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4384 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4385
4386 /*
4387  * sleep, with exponential backoff, and retry the LOCK operation.
4388  */
4389 static unsigned long
4390 nfs4_set_lock_task_retry(unsigned long timeout)
4391 {
4392         freezable_schedule_timeout_killable(timeout);
4393         timeout <<= 1;
4394         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4395                 return NFS4_LOCK_MAXTIMEOUT;
4396         return timeout;
4397 }
4398
4399 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4400 {
4401         struct inode *inode = state->inode;
4402         struct nfs_server *server = NFS_SERVER(inode);
4403         struct nfs_client *clp = server->nfs_client;
4404         struct nfs_lockt_args arg = {
4405                 .fh = NFS_FH(inode),
4406                 .fl = request,
4407         };
4408         struct nfs_lockt_res res = {
4409                 .denied = request,
4410         };
4411         struct rpc_message msg = {
4412                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4413                 .rpc_argp       = &arg,
4414                 .rpc_resp       = &res,
4415                 .rpc_cred       = state->owner->so_cred,
4416         };
4417         struct nfs4_lock_state *lsp;
4418         int status;
4419
4420         arg.lock_owner.clientid = clp->cl_clientid;
4421         status = nfs4_set_lock_state(state, request);
4422         if (status != 0)
4423                 goto out;
4424         lsp = request->fl_u.nfs4_fl.owner;
4425         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4426         arg.lock_owner.s_dev = server->s_dev;
4427         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4428         switch (status) {
4429                 case 0:
4430                         request->fl_type = F_UNLCK;
4431                         break;
4432                 case -NFS4ERR_DENIED:
4433                         status = 0;
4434         }
4435         request->fl_ops->fl_release_private(request);
4436 out:
4437         return status;
4438 }
4439
4440 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4441 {
4442         struct nfs4_exception exception = { };
4443         int err;
4444
4445         do {
4446                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4447                                 _nfs4_proc_getlk(state, cmd, request),
4448                                 &exception);
4449         } while (exception.retry);
4450         return err;
4451 }
4452
4453 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4454 {
4455         int res = 0;
4456         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4457                 case FL_POSIX:
4458                         res = posix_lock_file_wait(file, fl);
4459                         break;
4460                 case FL_FLOCK:
4461                         res = flock_lock_file_wait(file, fl);
4462                         break;
4463                 default:
4464                         BUG();
4465         }
4466         return res;
4467 }
4468
4469 struct nfs4_unlockdata {
4470         struct nfs_locku_args arg;
4471         struct nfs_locku_res res;
4472         struct nfs4_lock_state *lsp;
4473         struct nfs_open_context *ctx;
4474         struct file_lock fl;
4475         const struct nfs_server *server;
4476         unsigned long timestamp;
4477 };
4478
4479 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4480                 struct nfs_open_context *ctx,
4481                 struct nfs4_lock_state *lsp,
4482                 struct nfs_seqid *seqid)
4483 {
4484         struct nfs4_unlockdata *p;
4485         struct inode *inode = lsp->ls_state->inode;
4486
4487         p = kzalloc(sizeof(*p), GFP_NOFS);
4488         if (p == NULL)
4489                 return NULL;
4490         p->arg.fh = NFS_FH(inode);
4491         p->arg.fl = &p->fl;
4492         p->arg.seqid = seqid;
4493         p->res.seqid = seqid;
4494         p->arg.stateid = &lsp->ls_stateid;
4495         p->lsp = lsp;
4496         atomic_inc(&lsp->ls_count);
4497         /* Ensure we don't close file until we're done freeing locks! */
4498         p->ctx = get_nfs_open_context(ctx);
4499         memcpy(&p->fl, fl, sizeof(p->fl));
4500         p->server = NFS_SERVER(inode);
4501         return p;
4502 }
4503
4504 static void nfs4_locku_release_calldata(void *data)
4505 {
4506         struct nfs4_unlockdata *calldata = data;
4507         nfs_free_seqid(calldata->arg.seqid);
4508         nfs4_put_lock_state(calldata->lsp);
4509         put_nfs_open_context(calldata->ctx);
4510         kfree(calldata);
4511 }
4512
4513 static void nfs4_locku_done(struct rpc_task *task, void *data)
4514 {
4515         struct nfs4_unlockdata *calldata = data;
4516
4517         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4518                 return;
4519         switch (task->tk_status) {
4520                 case 0:
4521                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4522                                         &calldata->res.stateid);
4523                         renew_lease(calldata->server, calldata->timestamp);
4524                         break;
4525                 case -NFS4ERR_BAD_STATEID:
4526                 case -NFS4ERR_OLD_STATEID:
4527                 case -NFS4ERR_STALE_STATEID:
4528                 case -NFS4ERR_EXPIRED:
4529                         break;
4530                 default:
4531                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4532                                 rpc_restart_call_prepare(task);
4533         }
4534         nfs_release_seqid(calldata->arg.seqid);
4535 }
4536
4537 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4538 {
4539         struct nfs4_unlockdata *calldata = data;
4540
4541         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4542                 return;
4543         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4544                 /* Note: exit _without_ running nfs4_locku_done */
4545                 task->tk_action = NULL;
4546                 return;
4547         }
4548         calldata->timestamp = jiffies;
4549         if (nfs4_setup_sequence(calldata->server,
4550                                 &calldata->arg.seq_args,
4551                                 &calldata->res.seq_res,
4552                                 task) != 0)
4553                 nfs_release_seqid(calldata->arg.seqid);
4554         else
4555                 rpc_call_start(task);
4556 }
4557
4558 static const struct rpc_call_ops nfs4_locku_ops = {
4559         .rpc_call_prepare = nfs4_locku_prepare,
4560         .rpc_call_done = nfs4_locku_done,
4561         .rpc_release = nfs4_locku_release_calldata,
4562 };
4563
4564 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4565                 struct nfs_open_context *ctx,
4566                 struct nfs4_lock_state *lsp,
4567                 struct nfs_seqid *seqid)
4568 {
4569         struct nfs4_unlockdata *data;
4570         struct rpc_message msg = {
4571                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4572                 .rpc_cred = ctx->cred,
4573         };
4574         struct rpc_task_setup task_setup_data = {
4575                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4576                 .rpc_message = &msg,
4577                 .callback_ops = &nfs4_locku_ops,
4578                 .workqueue = nfsiod_workqueue,
4579                 .flags = RPC_TASK_ASYNC,
4580         };
4581
4582         /* Ensure this is an unlock - when canceling a lock, the
4583          * canceled lock is passed in, and it won't be an unlock.
4584          */
4585         fl->fl_type = F_UNLCK;
4586
4587         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4588         if (data == NULL) {
4589                 nfs_free_seqid(seqid);
4590                 return ERR_PTR(-ENOMEM);
4591         }
4592
4593         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4594         msg.rpc_argp = &data->arg;
4595         msg.rpc_resp = &data->res;
4596         task_setup_data.callback_data = data;
4597         return rpc_run_task(&task_setup_data);
4598 }
4599
4600 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4601 {
4602         struct nfs_inode *nfsi = NFS_I(state->inode);
4603         struct nfs_seqid *seqid;
4604         struct nfs4_lock_state *lsp;
4605         struct rpc_task *task;
4606         int status = 0;
4607         unsigned char fl_flags = request->fl_flags;
4608
4609         status = nfs4_set_lock_state(state, request);
4610         /* Unlock _before_ we do the RPC call */
4611         request->fl_flags |= FL_EXISTS;
4612         down_read(&nfsi->rwsem);
4613         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4614                 up_read(&nfsi->rwsem);
4615                 goto out;
4616         }
4617         up_read(&nfsi->rwsem);
4618         if (status != 0)
4619                 goto out;
4620         /* Is this a delegated lock? */
4621         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4622                 goto out;
4623         lsp = request->fl_u.nfs4_fl.owner;
4624         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4625         status = -ENOMEM;
4626         if (seqid == NULL)
4627                 goto out;
4628         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4629         status = PTR_ERR(task);
4630         if (IS_ERR(task))
4631                 goto out;
4632         status = nfs4_wait_for_completion_rpc_task(task);
4633         rpc_put_task(task);
4634 out:
4635         request->fl_flags = fl_flags;
4636         return status;
4637 }
4638
4639 struct nfs4_lockdata {
4640         struct nfs_lock_args arg;
4641         struct nfs_lock_res res;
4642         struct nfs4_lock_state *lsp;
4643         struct nfs_open_context *ctx;
4644         struct file_lock fl;
4645         unsigned long timestamp;
4646         int rpc_status;
4647         int cancelled;
4648         struct nfs_server *server;
4649 };
4650
4651 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4652                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4653                 gfp_t gfp_mask)
4654 {
4655         struct nfs4_lockdata *p;
4656         struct inode *inode = lsp->ls_state->inode;
4657         struct nfs_server *server = NFS_SERVER(inode);
4658
4659         p = kzalloc(sizeof(*p), gfp_mask);
4660         if (p == NULL)
4661                 return NULL;
4662
4663         p->arg.fh = NFS_FH(inode);
4664         p->arg.fl = &p->fl;
4665         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4666         if (p->arg.open_seqid == NULL)
4667                 goto out_free;
4668         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4669         if (p->arg.lock_seqid == NULL)
4670                 goto out_free_seqid;
4671         p->arg.lock_stateid = &lsp->ls_stateid;
4672         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4673         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4674         p->arg.lock_owner.s_dev = server->s_dev;
4675         p->res.lock_seqid = p->arg.lock_seqid;
4676         p->lsp = lsp;
4677         p->server = server;
4678         atomic_inc(&lsp->ls_count);
4679         p->ctx = get_nfs_open_context(ctx);
4680         memcpy(&p->fl, fl, sizeof(p->fl));
4681         return p;
4682 out_free_seqid:
4683         nfs_free_seqid(p->arg.open_seqid);
4684 out_free:
4685         kfree(p);
4686         return NULL;
4687 }
4688
4689 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4690 {
4691         struct nfs4_lockdata *data = calldata;
4692         struct nfs4_state *state = data->lsp->ls_state;
4693
4694         dprintk("%s: begin!\n", __func__);
4695         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4696                 return;
4697         /* Do we need to do an open_to_lock_owner? */
4698         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4699                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4700                         goto out_release_lock_seqid;
4701                 data->arg.open_stateid = &state->stateid;
4702                 data->arg.new_lock_owner = 1;
4703                 data->res.open_seqid = data->arg.open_seqid;
4704         } else
4705                 data->arg.new_lock_owner = 0;
4706         data->timestamp = jiffies;
4707         if (nfs4_setup_sequence(data->server,
4708                                 &data->arg.seq_args,
4709                                 &data->res.seq_res,
4710                                 task) == 0) {
4711                 rpc_call_start(task);
4712                 return;
4713         }
4714         nfs_release_seqid(data->arg.open_seqid);
4715 out_release_lock_seqid:
4716         nfs_release_seqid(data->arg.lock_seqid);
4717         dprintk("%s: done!, ret = %d\n", __func__, task->tk_status);
4718 }
4719
4720 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4721 {
4722         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4723         nfs4_lock_prepare(task, calldata);
4724 }
4725
4726 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4727 {
4728         struct nfs4_lockdata *data = calldata;
4729
4730         dprintk("%s: begin!\n", __func__);
4731
4732         if (!nfs4_sequence_done(task, &data->res.seq_res))
4733                 return;
4734
4735         data->rpc_status = task->tk_status;
4736         if (data->arg.new_lock_owner != 0) {
4737                 if (data->rpc_status == 0)
4738                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4739                 else
4740                         goto out;
4741         }
4742         if (data->rpc_status == 0) {
4743                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4744                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4745                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4746         }
4747 out:
4748         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4749 }
4750
4751 static void nfs4_lock_release(void *calldata)
4752 {
4753         struct nfs4_lockdata *data = calldata;
4754
4755         dprintk("%s: begin!\n", __func__);
4756         nfs_free_seqid(data->arg.open_seqid);
4757         if (data->cancelled != 0) {
4758                 struct rpc_task *task;
4759                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4760                                 data->arg.lock_seqid);
4761                 if (!IS_ERR(task))
4762                         rpc_put_task_async(task);
4763                 dprintk("%s: cancelling lock!\n", __func__);
4764         } else
4765                 nfs_free_seqid(data->arg.lock_seqid);
4766         nfs4_put_lock_state(data->lsp);
4767         put_nfs_open_context(data->ctx);
4768         kfree(data);
4769         dprintk("%s: done!\n", __func__);
4770 }
4771
4772 static const struct rpc_call_ops nfs4_lock_ops = {
4773         .rpc_call_prepare = nfs4_lock_prepare,
4774         .rpc_call_done = nfs4_lock_done,
4775         .rpc_release = nfs4_lock_release,
4776 };
4777
4778 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4779         .rpc_call_prepare = nfs4_recover_lock_prepare,
4780         .rpc_call_done = nfs4_lock_done,
4781         .rpc_release = nfs4_lock_release,
4782 };
4783
4784 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4785 {
4786         switch (error) {
4787         case -NFS4ERR_ADMIN_REVOKED:
4788         case -NFS4ERR_BAD_STATEID:
4789                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4790                 if (new_lock_owner != 0 ||
4791                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4792                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4793                 break;
4794         case -NFS4ERR_STALE_STATEID:
4795                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4796         case -NFS4ERR_EXPIRED:
4797                 nfs4_schedule_lease_recovery(server->nfs_client);
4798         };
4799 }
4800
4801 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4802 {
4803         struct nfs4_lockdata *data;
4804         struct rpc_task *task;
4805         struct rpc_message msg = {
4806                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4807                 .rpc_cred = state->owner->so_cred,
4808         };
4809         struct rpc_task_setup task_setup_data = {
4810                 .rpc_client = NFS_CLIENT(state->inode),
4811                 .rpc_message = &msg,
4812                 .callback_ops = &nfs4_lock_ops,
4813                 .workqueue = nfsiod_workqueue,
4814                 .flags = RPC_TASK_ASYNC,
4815         };
4816         int ret;
4817
4818         dprintk("%s: begin!\n", __func__);
4819         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4820                         fl->fl_u.nfs4_fl.owner,
4821                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4822         if (data == NULL)
4823                 return -ENOMEM;
4824         if (IS_SETLKW(cmd))
4825                 data->arg.block = 1;
4826         if (recovery_type > NFS_LOCK_NEW) {
4827                 if (recovery_type == NFS_LOCK_RECLAIM)
4828                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4829                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4830         }
4831         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4832         msg.rpc_argp = &data->arg;
4833         msg.rpc_resp = &data->res;
4834         task_setup_data.callback_data = data;
4835         task = rpc_run_task(&task_setup_data);
4836         if (IS_ERR(task))
4837                 return PTR_ERR(task);
4838         ret = nfs4_wait_for_completion_rpc_task(task);
4839         if (ret == 0) {
4840                 ret = data->rpc_status;
4841                 if (ret)
4842                         nfs4_handle_setlk_error(data->server, data->lsp,
4843                                         data->arg.new_lock_owner, ret);
4844         } else
4845                 data->cancelled = 1;
4846         rpc_put_task(task);
4847         dprintk("%s: done, ret = %d!\n", __func__, ret);
4848         return ret;
4849 }
4850
4851 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4852 {
4853         struct nfs_server *server = NFS_SERVER(state->inode);
4854         struct nfs4_exception exception = {
4855                 .inode = state->inode,
4856         };
4857         int err;
4858
4859         do {
4860                 /* Cache the lock if possible... */
4861                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4862                         return 0;
4863                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4864                 if (err != -NFS4ERR_DELAY)
4865                         break;
4866                 nfs4_handle_exception(server, err, &exception);
4867         } while (exception.retry);
4868         return err;
4869 }
4870
4871 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4872 {
4873         struct nfs_server *server = NFS_SERVER(state->inode);
4874         struct nfs4_exception exception = {
4875                 .inode = state->inode,
4876         };
4877         int err;
4878
4879         err = nfs4_set_lock_state(state, request);
4880         if (err != 0)
4881                 return err;
4882         do {
4883                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4884                         return 0;
4885                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4886                 switch (err) {
4887                 default:
4888                         goto out;
4889                 case -NFS4ERR_GRACE:
4890                 case -NFS4ERR_DELAY:
4891                         nfs4_handle_exception(server, err, &exception);
4892                         err = 0;
4893                 }
4894         } while (exception.retry);
4895 out:
4896         return err;
4897 }
4898
4899 #if defined(CONFIG_NFS_V4_1)
4900 /**
4901  * nfs41_check_expired_locks - possibly free a lock stateid
4902  *
4903  * @state: NFSv4 state for an inode
4904  *
4905  * Returns NFS_OK if recovery for this stateid is now finished.
4906  * Otherwise a negative NFS4ERR value is returned.
4907  */
4908 static int nfs41_check_expired_locks(struct nfs4_state *state)
4909 {
4910         int status, ret = -NFS4ERR_BAD_STATEID;
4911         struct nfs4_lock_state *lsp;
4912         struct nfs_server *server = NFS_SERVER(state->inode);
4913
4914         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4915                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4916                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4917                         if (status != NFS_OK) {
4918                                 /* Free the stateid unless the server
4919                                  * informs us the stateid is unrecognized. */
4920                                 if (status != -NFS4ERR_BAD_STATEID)
4921                                         nfs41_free_stateid(server,
4922                                                         &lsp->ls_stateid);
4923                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4924                                 ret = status;
4925                         }
4926                 }
4927         };
4928
4929         return ret;
4930 }
4931
4932 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4933 {
4934         int status = NFS_OK;
4935
4936         if (test_bit(LK_STATE_IN_USE, &state->flags))
4937                 status = nfs41_check_expired_locks(state);
4938         if (status != NFS_OK)
4939                 status = nfs4_lock_expired(state, request);
4940         return status;
4941 }
4942 #endif
4943
4944 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4945 {
4946         struct nfs_inode *nfsi = NFS_I(state->inode);
4947         unsigned char fl_flags = request->fl_flags;
4948         int status = -ENOLCK;
4949
4950         if ((fl_flags & FL_POSIX) &&
4951                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4952                 goto out;
4953         /* Is this a delegated open? */
4954         status = nfs4_set_lock_state(state, request);
4955         if (status != 0)
4956                 goto out;
4957         request->fl_flags |= FL_ACCESS;
4958         status = do_vfs_lock(request->fl_file, request);
4959         if (status < 0)
4960                 goto out;
4961         down_read(&nfsi->rwsem);
4962         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4963                 /* Yes: cache locks! */
4964                 /* ...but avoid races with delegation recall... */
4965                 request->fl_flags = fl_flags & ~FL_SLEEP;
4966                 status = do_vfs_lock(request->fl_file, request);
4967                 goto out_unlock;
4968         }
4969         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4970         if (status != 0)
4971                 goto out_unlock;
4972         /* Note: we always want to sleep here! */
4973         request->fl_flags = fl_flags | FL_SLEEP;
4974         if (do_vfs_lock(request->fl_file, request) < 0)
4975                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4976                         "manager!\n", __func__);
4977 out_unlock:
4978         up_read(&nfsi->rwsem);
4979 out:
4980         request->fl_flags = fl_flags;
4981         return status;
4982 }
4983
4984 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4985 {
4986         struct nfs4_exception exception = {
4987                 .state = state,
4988                 .inode = state->inode,
4989         };
4990         int err;
4991
4992         do {
4993                 err = _nfs4_proc_setlk(state, cmd, request);
4994                 if (err == -NFS4ERR_DENIED)
4995                         err = -EAGAIN;
4996                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4997                                 err, &exception);
4998         } while (exception.retry);
4999         return err;
5000 }
5001
5002 static int
5003 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5004 {
5005         struct nfs_open_context *ctx;
5006         struct nfs4_state *state;
5007         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5008         int status;
5009
5010         /* verify open state */
5011         ctx = nfs_file_open_context(filp);
5012         state = ctx->state;
5013
5014         if (request->fl_start < 0 || request->fl_end < 0)
5015                 return -EINVAL;
5016
5017         if (IS_GETLK(cmd)) {
5018                 if (state != NULL)
5019                         return nfs4_proc_getlk(state, F_GETLK, request);
5020                 return 0;
5021         }
5022
5023         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5024                 return -EINVAL;
5025
5026         if (request->fl_type == F_UNLCK) {
5027                 if (state != NULL)
5028                         return nfs4_proc_unlck(state, cmd, request);
5029                 return 0;
5030         }
5031
5032         if (state == NULL)
5033                 return -ENOLCK;
5034         /*
5035          * Don't rely on the VFS having checked the file open mode,
5036          * since it won't do this for flock() locks.
5037          */
5038         switch (request->fl_type) {
5039         case F_RDLCK:
5040                 if (!(filp->f_mode & FMODE_READ))
5041                         return -EBADF;
5042                 break;
5043         case F_WRLCK:
5044                 if (!(filp->f_mode & FMODE_WRITE))
5045                         return -EBADF;
5046         }
5047
5048         do {
5049                 status = nfs4_proc_setlk(state, cmd, request);
5050                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5051                         break;
5052                 timeout = nfs4_set_lock_task_retry(timeout);
5053                 status = -ERESTARTSYS;
5054                 if (signalled())
5055                         break;
5056         } while(status < 0);
5057         return status;
5058 }
5059
5060 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
5061 {
5062         struct nfs_server *server = NFS_SERVER(state->inode);
5063         struct nfs4_exception exception = { };
5064         int err;
5065
5066         err = nfs4_set_lock_state(state, fl);
5067         if (err != 0)
5068                 goto out;
5069         do {
5070                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5071                 switch (err) {
5072                         default:
5073                                 printk(KERN_ERR "NFS: %s: unhandled error "
5074                                         "%d.\n", __func__, err);
5075                         case 0:
5076                         case -ESTALE:
5077                                 goto out;
5078                         case -NFS4ERR_EXPIRED:
5079                                 nfs4_schedule_stateid_recovery(server, state);
5080                         case -NFS4ERR_STALE_CLIENTID:
5081                         case -NFS4ERR_STALE_STATEID:
5082                                 nfs4_schedule_lease_recovery(server->nfs_client);
5083                                 goto out;
5084                         case -NFS4ERR_BADSESSION:
5085                         case -NFS4ERR_BADSLOT:
5086                         case -NFS4ERR_BAD_HIGH_SLOT:
5087                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
5088                         case -NFS4ERR_DEADSESSION:
5089                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
5090                                 goto out;
5091                         case -ERESTARTSYS:
5092                                 /*
5093                                  * The show must go on: exit, but mark the
5094                                  * stateid as needing recovery.
5095                                  */
5096                         case -NFS4ERR_DELEG_REVOKED:
5097                         case -NFS4ERR_ADMIN_REVOKED:
5098                         case -NFS4ERR_BAD_STATEID:
5099                         case -NFS4ERR_OPENMODE:
5100                                 nfs4_schedule_stateid_recovery(server, state);
5101                                 err = 0;
5102                                 goto out;
5103                         case -EKEYEXPIRED:
5104                                 /*
5105                                  * User RPCSEC_GSS context has expired.
5106                                  * We cannot recover this stateid now, so
5107                                  * skip it and allow recovery thread to
5108                                  * proceed.
5109                                  */
5110                                 err = 0;
5111                                 goto out;
5112                         case -ENOMEM:
5113                         case -NFS4ERR_DENIED:
5114                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
5115                                 err = 0;
5116                                 goto out;
5117                         case -NFS4ERR_DELAY:
5118                                 break;
5119                 }
5120                 err = nfs4_handle_exception(server, err, &exception);
5121         } while (exception.retry);
5122 out:
5123         return err;
5124 }
5125
5126 struct nfs_release_lockowner_data {
5127         struct nfs4_lock_state *lsp;
5128         struct nfs_server *server;
5129         struct nfs_release_lockowner_args args;
5130 };
5131
5132 static void nfs4_release_lockowner_release(void *calldata)
5133 {
5134         struct nfs_release_lockowner_data *data = calldata;
5135         nfs4_free_lock_state(data->server, data->lsp);
5136         kfree(calldata);
5137 }
5138
5139 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5140         .rpc_release = nfs4_release_lockowner_release,
5141 };
5142
5143 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5144 {
5145         struct nfs_server *server = lsp->ls_state->owner->so_server;
5146         struct nfs_release_lockowner_data *data;
5147         struct rpc_message msg = {
5148                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5149         };
5150
5151         if (server->nfs_client->cl_mvops->minor_version != 0)
5152                 return -EINVAL;
5153         data = kmalloc(sizeof(*data), GFP_NOFS);
5154         if (!data)
5155                 return -ENOMEM;
5156         data->lsp = lsp;
5157         data->server = server;
5158         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5159         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5160         data->args.lock_owner.s_dev = server->s_dev;
5161         msg.rpc_argp = &data->args;
5162         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5163         return 0;
5164 }
5165
5166 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5167
5168 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5169                                    const void *buf, size_t buflen,
5170                                    int flags, int type)
5171 {
5172         if (strcmp(key, "") != 0)
5173                 return -EINVAL;
5174
5175         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5176 }
5177
5178 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5179                                    void *buf, size_t buflen, int type)
5180 {
5181         if (strcmp(key, "") != 0)
5182                 return -EINVAL;
5183
5184         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5185 }
5186
5187 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5188                                        size_t list_len, const char *name,
5189                                        size_t name_len, int type)
5190 {
5191         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5192
5193         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5194                 return 0;
5195
5196         if (list && len <= list_len)
5197                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5198         return len;
5199 }
5200
5201 /*
5202  * nfs_fhget will use either the mounted_on_fileid or the fileid
5203  */
5204 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5205 {
5206         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5207                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5208               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5209               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5210                 return;
5211
5212         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5213                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5214         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5215         fattr->nlink = 2;
5216 }
5217
5218 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5219                                    const struct qstr *name,
5220                                    struct nfs4_fs_locations *fs_locations,
5221                                    struct page *page)
5222 {
5223         struct nfs_server *server = NFS_SERVER(dir);
5224         u32 bitmask[2] = {
5225                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5226         };
5227         struct nfs4_fs_locations_arg args = {
5228                 .dir_fh = NFS_FH(dir),
5229                 .name = name,
5230                 .page = page,
5231                 .bitmask = bitmask,
5232         };
5233         struct nfs4_fs_locations_res res = {
5234                 .fs_locations = fs_locations,
5235         };
5236         struct rpc_message msg = {
5237                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5238                 .rpc_argp = &args,
5239                 .rpc_resp = &res,
5240         };
5241         int status;
5242
5243         dprintk("%s: start\n", __func__);
5244
5245         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5246          * is not supported */
5247         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5248                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5249         else
5250                 bitmask[0] |= FATTR4_WORD0_FILEID;
5251
5252         nfs_fattr_init(&fs_locations->fattr);
5253         fs_locations->server = server;
5254         fs_locations->nlocations = 0;
5255         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5256         dprintk("%s: returned status = %d\n", __func__, status);
5257         return status;
5258 }
5259
5260 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5261                            const struct qstr *name,
5262                            struct nfs4_fs_locations *fs_locations,
5263                            struct page *page)
5264 {
5265         struct nfs4_exception exception = { };
5266         int err;
5267         do {
5268                 err = nfs4_handle_exception(NFS_SERVER(dir),
5269                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5270                                 &exception);
5271         } while (exception.retry);
5272         return err;
5273 }
5274
5275 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5276 {
5277         int status;
5278         struct nfs4_secinfo_arg args = {
5279                 .dir_fh = NFS_FH(dir),
5280                 .name   = name,
5281         };
5282         struct nfs4_secinfo_res res = {
5283                 .flavors     = flavors,
5284         };
5285         struct rpc_message msg = {
5286                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5287                 .rpc_argp = &args,
5288                 .rpc_resp = &res,
5289         };
5290
5291         dprintk("NFS call  secinfo %s\n", name->name);
5292         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5293         dprintk("NFS reply  secinfo: %d\n", status);
5294         return status;
5295 }
5296
5297 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5298                       struct nfs4_secinfo_flavors *flavors)
5299 {
5300         struct nfs4_exception exception = { };
5301         int err;
5302         do {
5303                 err = nfs4_handle_exception(NFS_SERVER(dir),
5304                                 _nfs4_proc_secinfo(dir, name, flavors),
5305                                 &exception);
5306         } while (exception.retry);
5307         return err;
5308 }
5309
5310 #ifdef CONFIG_NFS_V4_1
5311 /*
5312  * Check the exchange flags returned by the server for invalid flags, having
5313  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5314  * DS flags set.
5315  */
5316 static int nfs4_check_cl_exchange_flags(u32 flags)
5317 {
5318         if (flags & ~EXCHGID4_FLAG_MASK_R)
5319                 goto out_inval;
5320         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5321             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5322                 goto out_inval;
5323         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5324                 goto out_inval;
5325         return NFS_OK;
5326 out_inval:
5327         return -NFS4ERR_INVAL;
5328 }
5329
5330 static bool
5331 nfs41_same_server_scope(struct nfs41_server_scope *a,
5332                         struct nfs41_server_scope *b)
5333 {
5334         if (a->server_scope_sz == b->server_scope_sz &&
5335             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5336                 return true;
5337
5338         return false;
5339 }
5340
5341 /*
5342  * nfs4_proc_bind_conn_to_session()
5343  *
5344  * The 4.1 client currently uses the same TCP connection for the
5345  * fore and backchannel.
5346  */
5347 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5348 {
5349         int status;
5350         struct nfs41_bind_conn_to_session_res res;
5351         struct rpc_message msg = {
5352                 .rpc_proc =
5353                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5354                 .rpc_argp = clp,
5355                 .rpc_resp = &res,
5356                 .rpc_cred = cred,
5357         };
5358
5359         dprintk("--> %s\n", __func__);
5360         BUG_ON(clp == NULL);
5361
5362         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5363         if (unlikely(res.session == NULL)) {
5364                 status = -ENOMEM;
5365                 goto out;
5366         }
5367
5368         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5369         if (status == 0) {
5370                 if (memcmp(res.session->sess_id.data,
5371                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5372                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5373                         status = -EIO;
5374                         goto out_session;
5375                 }
5376                 if (res.dir != NFS4_CDFS4_BOTH) {
5377                         dprintk("NFS: %s: Unexpected direction from server\n",
5378                                 __func__);
5379                         status = -EIO;
5380                         goto out_session;
5381                 }
5382                 if (res.use_conn_in_rdma_mode) {
5383                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5384                                 __func__);
5385                         status = -EIO;
5386                         goto out_session;
5387                 }
5388         }
5389 out_session:
5390         kfree(res.session);
5391 out:
5392         dprintk("<-- %s status= %d\n", __func__, status);
5393         return status;
5394 }
5395
5396 /*
5397  * nfs4_proc_exchange_id()
5398  *
5399  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5400  *
5401  * Since the clientid has expired, all compounds using sessions
5402  * associated with the stale clientid will be returning
5403  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5404  * be in some phase of session reset.
5405  */
5406 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5407 {
5408         nfs4_verifier verifier;
5409         struct nfs41_exchange_id_args args = {
5410                 .verifier = &verifier,
5411                 .client = clp,
5412                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5413         };
5414         struct nfs41_exchange_id_res res = {
5415                 0
5416         };
5417         int status;
5418         struct rpc_message msg = {
5419                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5420                 .rpc_argp = &args,
5421                 .rpc_resp = &res,
5422                 .rpc_cred = cred,
5423         };
5424
5425         nfs4_init_boot_verifier(clp, &verifier);
5426         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5427                                                         sizeof(args.id));
5428         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5429                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5430                 args.id_len, args.id);
5431
5432         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5433                                         GFP_NOFS);
5434         if (unlikely(res.server_owner == NULL)) {
5435                 status = -ENOMEM;
5436                 goto out;
5437         }
5438
5439         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5440                                         GFP_NOFS);
5441         if (unlikely(res.server_scope == NULL)) {
5442                 status = -ENOMEM;
5443                 goto out_server_owner;
5444         }
5445
5446         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5447         if (unlikely(res.impl_id == NULL)) {
5448                 status = -ENOMEM;
5449                 goto out_server_scope;
5450         }
5451
5452         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5453         if (status == 0)
5454                 status = nfs4_check_cl_exchange_flags(res.flags);
5455
5456         if (status == 0) {
5457                 clp->cl_clientid = res.clientid;
5458                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5459                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5460                         clp->cl_seqid = res.seqid;
5461
5462                 kfree(clp->cl_serverowner);
5463                 clp->cl_serverowner = res.server_owner;
5464                 res.server_owner = NULL;
5465
5466                 /* use the most recent implementation id */
5467                 kfree(clp->cl_implid);
5468                 clp->cl_implid = res.impl_id;
5469
5470                 if (clp->cl_serverscope != NULL &&
5471                     !nfs41_same_server_scope(clp->cl_serverscope,
5472                                              res.server_scope)) {
5473                         dprintk("%s: server_scope mismatch detected\n",
5474                                 __func__);
5475                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5476                         kfree(clp->cl_serverscope);
5477                         clp->cl_serverscope = NULL;
5478                 }
5479
5480                 if (clp->cl_serverscope == NULL) {
5481                         clp->cl_serverscope = res.server_scope;
5482                         goto out;
5483                 }
5484         } else
5485                 kfree(res.impl_id);
5486
5487 out_server_owner:
5488         kfree(res.server_owner);
5489 out_server_scope:
5490         kfree(res.server_scope);
5491 out:
5492         if (clp->cl_implid != NULL)
5493                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5494                         "domain: %s, name: %s, date: %llu,%u\n",
5495                         clp->cl_implid->domain, clp->cl_implid->name,
5496                         clp->cl_implid->date.seconds,
5497                         clp->cl_implid->date.nseconds);
5498         dprintk("NFS reply exchange_id: %d\n", status);
5499         return status;
5500 }
5501
5502 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5503                 struct rpc_cred *cred)
5504 {
5505         struct rpc_message msg = {
5506                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5507                 .rpc_argp = clp,
5508                 .rpc_cred = cred,
5509         };
5510         int status;
5511
5512         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5513         if (status)
5514                 dprintk("NFS: Got error %d from the server %s on "
5515                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5516         return status;
5517 }
5518
5519 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5520                 struct rpc_cred *cred)
5521 {
5522         unsigned int loop;
5523         int ret;
5524
5525         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5526                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5527                 switch (ret) {
5528                 case -NFS4ERR_DELAY:
5529                 case -NFS4ERR_CLIENTID_BUSY:
5530                         ssleep(1);
5531                         break;
5532                 default:
5533                         return ret;
5534                 }
5535         }
5536         return 0;
5537 }
5538
5539 int nfs4_destroy_clientid(struct nfs_client *clp)
5540 {
5541         struct rpc_cred *cred;
5542         int ret = 0;
5543
5544         if (clp->cl_mvops->minor_version < 1)
5545                 goto out;
5546         if (clp->cl_exchange_flags == 0)
5547                 goto out;
5548         if (clp->cl_preserve_clid)
5549                 goto out;
5550         cred = nfs4_get_exchange_id_cred(clp);
5551         ret = nfs4_proc_destroy_clientid(clp, cred);
5552         if (cred)
5553                 put_rpccred(cred);
5554         switch (ret) {
5555         case 0:
5556         case -NFS4ERR_STALE_CLIENTID:
5557                 clp->cl_exchange_flags = 0;
5558         }
5559 out:
5560         return ret;
5561 }
5562
5563 struct nfs4_get_lease_time_data {
5564         struct nfs4_get_lease_time_args *args;
5565         struct nfs4_get_lease_time_res *res;
5566         struct nfs_client *clp;
5567 };
5568
5569 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5570                                         void *calldata)
5571 {
5572         int ret;
5573         struct nfs4_get_lease_time_data *data =
5574                         (struct nfs4_get_lease_time_data *)calldata;
5575
5576         dprintk("--> %s\n", __func__);
5577         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5578         /* just setup sequence, do not trigger session recovery
5579            since we're invoked within one */
5580         ret = nfs41_setup_sequence(data->clp->cl_session,
5581                                    &data->args->la_seq_args,
5582                                    &data->res->lr_seq_res, task);
5583
5584         BUG_ON(ret == -EAGAIN);
5585         rpc_call_start(task);
5586         dprintk("<-- %s\n", __func__);
5587 }
5588
5589 /*
5590  * Called from nfs4_state_manager thread for session setup, so don't recover
5591  * from sequence operation or clientid errors.
5592  */
5593 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5594 {
5595         struct nfs4_get_lease_time_data *data =
5596                         (struct nfs4_get_lease_time_data *)calldata;
5597
5598         dprintk("--> %s\n", __func__);
5599         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5600                 return;
5601         switch (task->tk_status) {
5602         case -NFS4ERR_DELAY:
5603         case -NFS4ERR_GRACE:
5604                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5605                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5606                 task->tk_status = 0;
5607                 /* fall through */
5608         case -NFS4ERR_RETRY_UNCACHED_REP:
5609                 rpc_restart_call_prepare(task);
5610                 return;
5611         }
5612         dprintk("<-- %s\n", __func__);
5613 }
5614
5615 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5616         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5617         .rpc_call_done = nfs4_get_lease_time_done,
5618 };
5619
5620 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5621 {
5622         struct rpc_task *task;
5623         struct nfs4_get_lease_time_args args;
5624         struct nfs4_get_lease_time_res res = {
5625                 .lr_fsinfo = fsinfo,
5626         };
5627         struct nfs4_get_lease_time_data data = {
5628                 .args = &args,
5629                 .res = &res,
5630                 .clp = clp,
5631         };
5632         struct rpc_message msg = {
5633                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5634                 .rpc_argp = &args,
5635                 .rpc_resp = &res,
5636         };
5637         struct rpc_task_setup task_setup = {
5638                 .rpc_client = clp->cl_rpcclient,
5639                 .rpc_message = &msg,
5640                 .callback_ops = &nfs4_get_lease_time_ops,
5641                 .callback_data = &data,
5642                 .flags = RPC_TASK_TIMEOUT,
5643         };
5644         int status;
5645
5646         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5647         dprintk("--> %s\n", __func__);
5648         task = rpc_run_task(&task_setup);
5649
5650         if (IS_ERR(task))
5651                 status = PTR_ERR(task);
5652         else {
5653                 status = task->tk_status;
5654                 rpc_put_task(task);
5655         }
5656         dprintk("<-- %s return %d\n", __func__, status);
5657
5658         return status;
5659 }
5660
5661 static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5662 {
5663         return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5664 }
5665
5666 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5667                 struct nfs4_slot *new,
5668                 u32 max_slots,
5669                 u32 ivalue)
5670 {
5671         struct nfs4_slot *old = NULL;
5672         u32 i;
5673
5674         spin_lock(&tbl->slot_tbl_lock);
5675         if (new) {
5676                 old = tbl->slots;
5677                 tbl->slots = new;
5678                 tbl->max_slots = max_slots;
5679         }
5680         tbl->highest_used_slotid = NFS4_NO_SLOT;
5681         for (i = 0; i < tbl->max_slots; i++)
5682                 tbl->slots[i].seq_nr = ivalue;
5683         spin_unlock(&tbl->slot_tbl_lock);
5684         kfree(old);
5685 }
5686
5687 /*
5688  * (re)Initialise a slot table
5689  */
5690 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5691                                  u32 ivalue)
5692 {
5693         struct nfs4_slot *new = NULL;
5694         int ret = -ENOMEM;
5695
5696         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5697                 max_reqs, tbl->max_slots);
5698
5699         /* Does the newly negotiated max_reqs match the existing slot table? */
5700         if (max_reqs != tbl->max_slots) {
5701                 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5702                 if (!new)
5703                         goto out;
5704         }
5705         ret = 0;
5706
5707         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5708         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5709                 tbl, tbl->slots, tbl->max_slots);
5710 out:
5711         dprintk("<-- %s: return %d\n", __func__, ret);
5712         return ret;
5713 }
5714
5715 /* Destroy the slot table */
5716 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5717 {
5718         if (session->fc_slot_table.slots != NULL) {
5719                 kfree(session->fc_slot_table.slots);
5720                 session->fc_slot_table.slots = NULL;
5721         }
5722         if (session->bc_slot_table.slots != NULL) {
5723                 kfree(session->bc_slot_table.slots);
5724                 session->bc_slot_table.slots = NULL;
5725         }
5726         return;
5727 }
5728
5729 /*
5730  * Initialize or reset the forechannel and backchannel tables
5731  */
5732 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5733 {
5734         struct nfs4_slot_table *tbl;
5735         int status;
5736
5737         dprintk("--> %s\n", __func__);
5738         /* Fore channel */
5739         tbl = &ses->fc_slot_table;
5740         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5741         if (status) /* -ENOMEM */
5742                 return status;
5743         /* Back channel */
5744         tbl = &ses->bc_slot_table;
5745         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5746         if (status && tbl->slots == NULL)
5747                 /* Fore and back channel share a connection so get
5748                  * both slot tables or neither */
5749                 nfs4_destroy_slot_tables(ses);
5750         return status;
5751 }
5752
5753 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5754 {
5755         struct nfs4_session *session;
5756         struct nfs4_slot_table *tbl;
5757
5758         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5759         if (!session)
5760                 return NULL;
5761
5762         tbl = &session->fc_slot_table;
5763         tbl->highest_used_slotid = NFS4_NO_SLOT;
5764         spin_lock_init(&tbl->slot_tbl_lock);
5765         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5766         init_completion(&tbl->complete);
5767
5768         tbl = &session->bc_slot_table;
5769         tbl->highest_used_slotid = NFS4_NO_SLOT;
5770         spin_lock_init(&tbl->slot_tbl_lock);
5771         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5772         init_completion(&tbl->complete);
5773
5774         session->session_state = 1<<NFS4_SESSION_INITING;
5775
5776         session->clp = clp;
5777         return session;
5778 }
5779
5780 void nfs4_destroy_session(struct nfs4_session *session)
5781 {
5782         struct rpc_xprt *xprt;
5783         struct rpc_cred *cred;
5784
5785         cred = nfs4_get_exchange_id_cred(session->clp);
5786         nfs4_proc_destroy_session(session, cred);
5787         if (cred)
5788                 put_rpccred(cred);
5789
5790         rcu_read_lock();
5791         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5792         rcu_read_unlock();
5793         dprintk("%s Destroy backchannel for xprt %p\n",
5794                 __func__, xprt);
5795         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5796         nfs4_destroy_slot_tables(session);
5797         kfree(session);
5798 }
5799
5800 /*
5801  * Initialize the values to be used by the client in CREATE_SESSION
5802  * If nfs4_init_session set the fore channel request and response sizes,
5803  * use them.
5804  *
5805  * Set the back channel max_resp_sz_cached to zero to force the client to
5806  * always set csa_cachethis to FALSE because the current implementation
5807  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5808  */
5809 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5810 {
5811         struct nfs4_session *session = args->client->cl_session;
5812         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5813                      mxresp_sz = session->fc_attrs.max_resp_sz;
5814
5815         if (mxrqst_sz == 0)
5816                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5817         if (mxresp_sz == 0)
5818                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5819         /* Fore channel attributes */
5820         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5821         args->fc_attrs.max_resp_sz = mxresp_sz;
5822         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5823         args->fc_attrs.max_reqs = max_session_slots;
5824
5825         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5826                 "max_ops=%u max_reqs=%u\n",
5827                 __func__,
5828                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5829                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5830
5831         /* Back channel attributes */
5832         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5833         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5834         args->bc_attrs.max_resp_sz_cached = 0;
5835         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5836         args->bc_attrs.max_reqs = 1;
5837
5838         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5839                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5840                 __func__,
5841                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5842                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5843                 args->bc_attrs.max_reqs);
5844 }
5845
5846 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5847 {
5848         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5849         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5850
5851         if (rcvd->max_resp_sz > sent->max_resp_sz)
5852                 return -EINVAL;
5853         /*
5854          * Our requested max_ops is the minimum we need; we're not
5855          * prepared to break up compounds into smaller pieces than that.
5856          * So, no point even trying to continue if the server won't
5857          * cooperate:
5858          */
5859         if (rcvd->max_ops < sent->max_ops)
5860                 return -EINVAL;
5861         if (rcvd->max_reqs == 0)
5862                 return -EINVAL;
5863         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5864                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5865         return 0;
5866 }
5867
5868 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5869 {
5870         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5871         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5872
5873         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5874                 return -EINVAL;
5875         if (rcvd->max_resp_sz < sent->max_resp_sz)
5876                 return -EINVAL;
5877         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5878                 return -EINVAL;
5879         /* These would render the backchannel useless: */
5880         if (rcvd->max_ops != sent->max_ops)
5881                 return -EINVAL;
5882         if (rcvd->max_reqs != sent->max_reqs)
5883                 return -EINVAL;
5884         return 0;
5885 }
5886
5887 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5888                                      struct nfs4_session *session)
5889 {
5890         int ret;
5891
5892         ret = nfs4_verify_fore_channel_attrs(args, session);
5893         if (ret)
5894                 return ret;
5895         return nfs4_verify_back_channel_attrs(args, session);
5896 }
5897
5898 static int _nfs4_proc_create_session(struct nfs_client *clp,
5899                 struct rpc_cred *cred)
5900 {
5901         struct nfs4_session *session = clp->cl_session;
5902         struct nfs41_create_session_args args = {
5903                 .client = clp,
5904                 .cb_program = NFS4_CALLBACK,
5905         };
5906         struct nfs41_create_session_res res = {
5907                 .client = clp,
5908         };
5909         struct rpc_message msg = {
5910                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5911                 .rpc_argp = &args,
5912                 .rpc_resp = &res,
5913                 .rpc_cred = cred,
5914         };
5915         int status;
5916
5917         nfs4_init_channel_attrs(&args);
5918         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5919
5920         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5921
5922         if (!status)
5923                 /* Verify the session's negotiated channel_attrs values */
5924                 status = nfs4_verify_channel_attrs(&args, session);
5925         if (!status) {
5926                 /* Increment the clientid slot sequence id */
5927                 clp->cl_seqid++;
5928         }
5929
5930         return status;
5931 }
5932
5933 /*
5934  * Issues a CREATE_SESSION operation to the server.
5935  * It is the responsibility of the caller to verify the session is
5936  * expired before calling this routine.
5937  */
5938 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5939 {
5940         int status;
5941         unsigned *ptr;
5942         struct nfs4_session *session = clp->cl_session;
5943
5944         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5945
5946         status = _nfs4_proc_create_session(clp, cred);
5947         if (status)
5948                 goto out;
5949
5950         /* Init or reset the session slot tables */
5951         status = nfs4_setup_session_slot_tables(session);
5952         dprintk("slot table setup returned %d\n", status);
5953         if (status)
5954                 goto out;
5955
5956         ptr = (unsigned *)&session->sess_id.data[0];
5957         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5958                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5959 out:
5960         dprintk("<-- %s\n", __func__);
5961         return status;
5962 }
5963
5964 /*
5965  * Issue the over-the-wire RPC DESTROY_SESSION.
5966  * The caller must serialize access to this routine.
5967  */
5968 int nfs4_proc_destroy_session(struct nfs4_session *session,
5969                 struct rpc_cred *cred)
5970 {
5971         struct rpc_message msg = {
5972                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5973                 .rpc_argp = session,
5974                 .rpc_cred = cred,
5975         };
5976         int status = 0;
5977
5978         dprintk("--> nfs4_proc_destroy_session\n");
5979
5980         /* session is still being setup */
5981         if (session->clp->cl_cons_state != NFS_CS_READY)
5982                 return status;
5983
5984         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5985
5986         if (status)
5987                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5988                         "Session has been destroyed regardless...\n", status);
5989
5990         dprintk("<-- nfs4_proc_destroy_session\n");
5991         return status;
5992 }
5993
5994 /*
5995  * With sessions, the client is not marked ready until after a
5996  * successful EXCHANGE_ID and CREATE_SESSION.
5997  *
5998  * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
5999  * other versions of NFS can be tried.
6000  */
6001 static int nfs41_check_session_ready(struct nfs_client *clp)
6002 {
6003         int ret;
6004
6005         if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
6006                 ret = nfs4_client_recover_expired_lease(clp);
6007                 if (ret)
6008                         return ret;
6009         }
6010         if (clp->cl_cons_state < NFS_CS_READY)
6011                 return -EPROTONOSUPPORT;
6012         smp_rmb();
6013         return 0;
6014 }
6015
6016 int nfs4_init_session(struct nfs_server *server)
6017 {
6018         struct nfs_client *clp = server->nfs_client;
6019         struct nfs4_session *session;
6020         unsigned int rsize, wsize;
6021
6022         if (!nfs4_has_session(clp))
6023                 return 0;
6024
6025         session = clp->cl_session;
6026         spin_lock(&clp->cl_lock);
6027         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
6028
6029                 rsize = server->rsize;
6030                 if (rsize == 0)
6031                         rsize = NFS_MAX_FILE_IO_SIZE;
6032                 wsize = server->wsize;
6033                 if (wsize == 0)
6034                         wsize = NFS_MAX_FILE_IO_SIZE;
6035
6036                 session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
6037                 session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
6038         }
6039         spin_unlock(&clp->cl_lock);
6040
6041         return nfs41_check_session_ready(clp);
6042 }
6043
6044 int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time)
6045 {
6046         struct nfs4_session *session = clp->cl_session;
6047         int ret;
6048
6049         spin_lock(&clp->cl_lock);
6050         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
6051                 /*
6052                  * Do not set NFS_CS_CHECK_LEASE_TIME instead set the
6053                  * DS lease to be equal to the MDS lease.
6054                  */
6055                 clp->cl_lease_time = lease_time;
6056                 clp->cl_last_renewal = jiffies;
6057         }
6058         spin_unlock(&clp->cl_lock);
6059
6060         ret = nfs41_check_session_ready(clp);
6061         if (ret)
6062                 return ret;
6063         /* Test for the DS role */
6064         if (!is_ds_client(clp))
6065                 return -ENODEV;
6066         return 0;
6067 }
6068 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
6069
6070
6071 /*
6072  * Renew the cl_session lease.
6073  */
6074 struct nfs4_sequence_data {
6075         struct nfs_client *clp;
6076         struct nfs4_sequence_args args;
6077         struct nfs4_sequence_res res;
6078 };
6079
6080 static void nfs41_sequence_release(void *data)
6081 {
6082         struct nfs4_sequence_data *calldata = data;
6083         struct nfs_client *clp = calldata->clp;
6084
6085         if (atomic_read(&clp->cl_count) > 1)
6086                 nfs4_schedule_state_renewal(clp);
6087         nfs_put_client(clp);
6088         kfree(calldata);
6089 }
6090
6091 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6092 {
6093         switch(task->tk_status) {
6094         case -NFS4ERR_DELAY:
6095                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6096                 return -EAGAIN;
6097         default:
6098                 nfs4_schedule_lease_recovery(clp);
6099         }
6100         return 0;
6101 }
6102
6103 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6104 {
6105         struct nfs4_sequence_data *calldata = data;
6106         struct nfs_client *clp = calldata->clp;
6107
6108         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6109                 return;
6110
6111         if (task->tk_status < 0) {
6112                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6113                 if (atomic_read(&clp->cl_count) == 1)
6114                         goto out;
6115
6116                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6117                         rpc_restart_call_prepare(task);
6118                         return;
6119                 }
6120         }
6121         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6122 out:
6123         dprintk("<-- %s\n", __func__);
6124 }
6125
6126 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6127 {
6128         struct nfs4_sequence_data *calldata = data;
6129         struct nfs_client *clp = calldata->clp;
6130         struct nfs4_sequence_args *args;
6131         struct nfs4_sequence_res *res;
6132
6133         args = task->tk_msg.rpc_argp;
6134         res = task->tk_msg.rpc_resp;
6135
6136         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
6137                 return;
6138         rpc_call_start(task);
6139 }
6140
6141 static const struct rpc_call_ops nfs41_sequence_ops = {
6142         .rpc_call_done = nfs41_sequence_call_done,
6143         .rpc_call_prepare = nfs41_sequence_prepare,
6144         .rpc_release = nfs41_sequence_release,
6145 };
6146
6147 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6148 {
6149         struct nfs4_sequence_data *calldata;
6150         struct rpc_message msg = {
6151                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6152                 .rpc_cred = cred,
6153         };
6154         struct rpc_task_setup task_setup_data = {
6155                 .rpc_client = clp->cl_rpcclient,
6156                 .rpc_message = &msg,
6157                 .callback_ops = &nfs41_sequence_ops,
6158                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
6159         };
6160
6161         if (!atomic_inc_not_zero(&clp->cl_count))
6162                 return ERR_PTR(-EIO);
6163         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6164         if (calldata == NULL) {
6165                 nfs_put_client(clp);
6166                 return ERR_PTR(-ENOMEM);
6167         }
6168         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
6169         msg.rpc_argp = &calldata->args;
6170         msg.rpc_resp = &calldata->res;
6171         calldata->clp = clp;
6172         task_setup_data.callback_data = calldata;
6173
6174         return rpc_run_task(&task_setup_data);
6175 }
6176
6177 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6178 {
6179         struct rpc_task *task;
6180         int ret = 0;
6181
6182         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6183                 return 0;
6184         task = _nfs41_proc_sequence(clp, cred);
6185         if (IS_ERR(task))
6186                 ret = PTR_ERR(task);
6187         else
6188                 rpc_put_task_async(task);
6189         dprintk("<-- %s status=%d\n", __func__, ret);
6190         return ret;
6191 }
6192
6193 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6194 {
6195         struct rpc_task *task;
6196         int ret;
6197
6198         task = _nfs41_proc_sequence(clp, cred);
6199         if (IS_ERR(task)) {
6200                 ret = PTR_ERR(task);
6201                 goto out;
6202         }
6203         ret = rpc_wait_for_completion_task(task);
6204         if (!ret) {
6205                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6206
6207                 if (task->tk_status == 0)
6208                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6209                 ret = task->tk_status;
6210         }
6211         rpc_put_task(task);
6212 out:
6213         dprintk("<-- %s status=%d\n", __func__, ret);
6214         return ret;
6215 }
6216
6217 struct nfs4_reclaim_complete_data {
6218         struct nfs_client *clp;
6219         struct nfs41_reclaim_complete_args arg;
6220         struct nfs41_reclaim_complete_res res;
6221 };
6222
6223 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6224 {
6225         struct nfs4_reclaim_complete_data *calldata = data;
6226
6227         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
6228         if (nfs41_setup_sequence(calldata->clp->cl_session,
6229                                 &calldata->arg.seq_args,
6230                                 &calldata->res.seq_res, task))
6231                 return;
6232
6233         rpc_call_start(task);
6234 }
6235
6236 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6237 {
6238         switch(task->tk_status) {
6239         case 0:
6240         case -NFS4ERR_COMPLETE_ALREADY:
6241         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6242                 break;
6243         case -NFS4ERR_DELAY:
6244                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6245                 /* fall through */
6246         case -NFS4ERR_RETRY_UNCACHED_REP:
6247                 return -EAGAIN;
6248         default:
6249                 nfs4_schedule_lease_recovery(clp);
6250         }
6251         return 0;
6252 }
6253
6254 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6255 {
6256         struct nfs4_reclaim_complete_data *calldata = data;
6257         struct nfs_client *clp = calldata->clp;
6258         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6259
6260         dprintk("--> %s\n", __func__);
6261         if (!nfs41_sequence_done(task, res))
6262                 return;
6263
6264         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6265                 rpc_restart_call_prepare(task);
6266                 return;
6267         }
6268         dprintk("<-- %s\n", __func__);
6269 }
6270
6271 static void nfs4_free_reclaim_complete_data(void *data)
6272 {
6273         struct nfs4_reclaim_complete_data *calldata = data;
6274
6275         kfree(calldata);
6276 }
6277
6278 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6279         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6280         .rpc_call_done = nfs4_reclaim_complete_done,
6281         .rpc_release = nfs4_free_reclaim_complete_data,
6282 };
6283
6284 /*
6285  * Issue a global reclaim complete.
6286  */
6287 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6288 {
6289         struct nfs4_reclaim_complete_data *calldata;
6290         struct rpc_task *task;
6291         struct rpc_message msg = {
6292                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6293         };
6294         struct rpc_task_setup task_setup_data = {
6295                 .rpc_client = clp->cl_rpcclient,
6296                 .rpc_message = &msg,
6297                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6298                 .flags = RPC_TASK_ASYNC,
6299         };
6300         int status = -ENOMEM;
6301
6302         dprintk("--> %s\n", __func__);
6303         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6304         if (calldata == NULL)
6305                 goto out;
6306         calldata->clp = clp;
6307         calldata->arg.one_fs = 0;
6308
6309         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6310         msg.rpc_argp = &calldata->arg;
6311         msg.rpc_resp = &calldata->res;
6312         task_setup_data.callback_data = calldata;
6313         task = rpc_run_task(&task_setup_data);
6314         if (IS_ERR(task)) {
6315                 status = PTR_ERR(task);
6316                 goto out;
6317         }
6318         status = nfs4_wait_for_completion_rpc_task(task);
6319         if (status == 0)
6320                 status = task->tk_status;
6321         rpc_put_task(task);
6322         return 0;
6323 out:
6324         dprintk("<-- %s status=%d\n", __func__, status);
6325         return status;
6326 }
6327
6328 static void
6329 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6330 {
6331         struct nfs4_layoutget *lgp = calldata;
6332         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6333
6334         dprintk("--> %s\n", __func__);
6335         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6336          * right now covering the LAYOUTGET we are about to send.
6337          * However, that is not so catastrophic, and there seems
6338          * to be no way to prevent it completely.
6339          */
6340         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6341                                 &lgp->res.seq_res, task))
6342                 return;
6343         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6344                                           NFS_I(lgp->args.inode)->layout,
6345                                           lgp->args.ctx->state)) {
6346                 rpc_exit(task, NFS4_OK);
6347                 return;
6348         }
6349         rpc_call_start(task);
6350 }
6351
6352 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6353 {
6354         struct nfs4_layoutget *lgp = calldata;
6355         struct inode *inode = lgp->args.inode;
6356         struct nfs_server *server = NFS_SERVER(inode);
6357         struct pnfs_layout_hdr *lo;
6358         struct nfs4_state *state = NULL;
6359
6360         dprintk("--> %s\n", __func__);
6361
6362         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6363                 goto out;
6364
6365         switch (task->tk_status) {
6366         case 0:
6367                 goto out;
6368         case -NFS4ERR_LAYOUTTRYLATER:
6369         case -NFS4ERR_RECALLCONFLICT:
6370                 task->tk_status = -NFS4ERR_DELAY;
6371                 break;
6372         case -NFS4ERR_EXPIRED:
6373         case -NFS4ERR_BAD_STATEID:
6374                 spin_lock(&inode->i_lock);
6375                 lo = NFS_I(inode)->layout;
6376                 if (!lo || list_empty(&lo->plh_segs)) {
6377                         spin_unlock(&inode->i_lock);
6378                         /* If the open stateid was bad, then recover it. */
6379                         state = lgp->args.ctx->state;
6380                 } else {
6381                         LIST_HEAD(head);
6382
6383                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6384                         spin_unlock(&inode->i_lock);
6385                         /* Mark the bad layout state as invalid, then
6386                          * retry using the open stateid. */
6387                         pnfs_free_lseg_list(&head);
6388                 }
6389         }
6390         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6391                 rpc_restart_call_prepare(task);
6392 out:
6393         dprintk("<-- %s\n", __func__);
6394 }
6395
6396 static size_t max_response_pages(struct nfs_server *server)
6397 {
6398         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6399         return nfs_page_array_len(0, max_resp_sz);
6400 }
6401
6402 static void nfs4_free_pages(struct page **pages, size_t size)
6403 {
6404         int i;
6405
6406         if (!pages)
6407                 return;
6408
6409         for (i = 0; i < size; i++) {
6410                 if (!pages[i])
6411                         break;
6412                 __free_page(pages[i]);
6413         }
6414         kfree(pages);
6415 }
6416
6417 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6418 {
6419         struct page **pages;
6420         int i;
6421
6422         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6423         if (!pages) {
6424                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6425                 return NULL;
6426         }
6427
6428         for (i = 0; i < size; i++) {
6429                 pages[i] = alloc_page(gfp_flags);
6430                 if (!pages[i]) {
6431                         dprintk("%s: failed to allocate page\n", __func__);
6432                         nfs4_free_pages(pages, size);
6433                         return NULL;
6434                 }
6435         }
6436
6437         return pages;
6438 }
6439
6440 static void nfs4_layoutget_release(void *calldata)
6441 {
6442         struct nfs4_layoutget *lgp = calldata;
6443         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6444         size_t max_pages = max_response_pages(server);
6445
6446         dprintk("--> %s\n", __func__);
6447         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6448         put_nfs_open_context(lgp->args.ctx);
6449         kfree(calldata);
6450         dprintk("<-- %s\n", __func__);
6451 }
6452
6453 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6454         .rpc_call_prepare = nfs4_layoutget_prepare,
6455         .rpc_call_done = nfs4_layoutget_done,
6456         .rpc_release = nfs4_layoutget_release,
6457 };
6458
6459 struct pnfs_layout_segment *
6460 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6461 {
6462         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6463         size_t max_pages = max_response_pages(server);
6464         struct rpc_task *task;
6465         struct rpc_message msg = {
6466                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6467                 .rpc_argp = &lgp->args,
6468                 .rpc_resp = &lgp->res,
6469         };
6470         struct rpc_task_setup task_setup_data = {
6471                 .rpc_client = server->client,
6472                 .rpc_message = &msg,
6473                 .callback_ops = &nfs4_layoutget_call_ops,
6474                 .callback_data = lgp,
6475                 .flags = RPC_TASK_ASYNC,
6476         };
6477         struct pnfs_layout_segment *lseg = NULL;
6478         int status = 0;
6479
6480         dprintk("--> %s\n", __func__);
6481
6482         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6483         if (!lgp->args.layout.pages) {
6484                 nfs4_layoutget_release(lgp);
6485                 return ERR_PTR(-ENOMEM);
6486         }
6487         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6488
6489         lgp->res.layoutp = &lgp->args.layout;
6490         lgp->res.seq_res.sr_slot = NULL;
6491         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6492         task = rpc_run_task(&task_setup_data);
6493         if (IS_ERR(task))
6494                 return ERR_CAST(task);
6495         status = nfs4_wait_for_completion_rpc_task(task);
6496         if (status == 0)
6497                 status = task->tk_status;
6498         if (status == 0)
6499                 lseg = pnfs_layout_process(lgp);
6500         rpc_put_task(task);
6501         dprintk("<-- %s status=%d\n", __func__, status);
6502         if (status)
6503                 return ERR_PTR(status);
6504         return lseg;
6505 }
6506
6507 static void
6508 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6509 {
6510         struct nfs4_layoutreturn *lrp = calldata;
6511
6512         dprintk("--> %s\n", __func__);
6513         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6514                                 &lrp->res.seq_res, task))
6515                 return;
6516         rpc_call_start(task);
6517 }
6518
6519 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6520 {
6521         struct nfs4_layoutreturn *lrp = calldata;
6522         struct nfs_server *server;
6523
6524         dprintk("--> %s\n", __func__);
6525
6526         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6527                 return;
6528
6529         server = NFS_SERVER(lrp->args.inode);
6530         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6531                 rpc_restart_call_prepare(task);
6532                 return;
6533         }
6534         dprintk("<-- %s\n", __func__);
6535 }
6536
6537 static void nfs4_layoutreturn_release(void *calldata)
6538 {
6539         struct nfs4_layoutreturn *lrp = calldata;
6540         struct pnfs_layout_hdr *lo = lrp->args.layout;
6541
6542         dprintk("--> %s\n", __func__);
6543         spin_lock(&lo->plh_inode->i_lock);
6544         if (lrp->res.lrs_present)
6545                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6546         lo->plh_block_lgets--;
6547         spin_unlock(&lo->plh_inode->i_lock);
6548         pnfs_put_layout_hdr(lrp->args.layout);
6549         kfree(calldata);
6550         dprintk("<-- %s\n", __func__);
6551 }
6552
6553 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6554         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6555         .rpc_call_done = nfs4_layoutreturn_done,
6556         .rpc_release = nfs4_layoutreturn_release,
6557 };
6558
6559 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6560 {
6561         struct rpc_task *task;
6562         struct rpc_message msg = {
6563                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6564                 .rpc_argp = &lrp->args,
6565                 .rpc_resp = &lrp->res,
6566         };
6567         struct rpc_task_setup task_setup_data = {
6568                 .rpc_client = lrp->clp->cl_rpcclient,
6569                 .rpc_message = &msg,
6570                 .callback_ops = &nfs4_layoutreturn_call_ops,
6571                 .callback_data = lrp,
6572         };
6573         int status;
6574
6575         dprintk("--> %s\n", __func__);
6576         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6577         task = rpc_run_task(&task_setup_data);
6578         if (IS_ERR(task))
6579                 return PTR_ERR(task);
6580         status = task->tk_status;
6581         dprintk("<-- %s status=%d\n", __func__, status);
6582         rpc_put_task(task);
6583         return status;
6584 }
6585
6586 /*
6587  * Retrieve the list of Data Server devices from the MDS.
6588  */
6589 static int _nfs4_getdevicelist(struct nfs_server *server,
6590                                     const struct nfs_fh *fh,
6591                                     struct pnfs_devicelist *devlist)
6592 {
6593         struct nfs4_getdevicelist_args args = {
6594                 .fh = fh,
6595                 .layoutclass = server->pnfs_curr_ld->id,
6596         };
6597         struct nfs4_getdevicelist_res res = {
6598                 .devlist = devlist,
6599         };
6600         struct rpc_message msg = {
6601                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6602                 .rpc_argp = &args,
6603                 .rpc_resp = &res,
6604         };
6605         int status;
6606
6607         dprintk("--> %s\n", __func__);
6608         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6609                                 &res.seq_res, 0);
6610         dprintk("<-- %s status=%d\n", __func__, status);
6611         return status;
6612 }
6613
6614 int nfs4_proc_getdevicelist(struct nfs_server *server,
6615                             const struct nfs_fh *fh,
6616                             struct pnfs_devicelist *devlist)
6617 {
6618         struct nfs4_exception exception = { };
6619         int err;
6620
6621         do {
6622                 err = nfs4_handle_exception(server,
6623                                 _nfs4_getdevicelist(server, fh, devlist),
6624                                 &exception);
6625         } while (exception.retry);
6626
6627         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6628                 err, devlist->num_devs);
6629
6630         return err;
6631 }
6632 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6633
6634 static int
6635 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6636 {
6637         struct nfs4_getdeviceinfo_args args = {
6638                 .pdev = pdev,
6639         };
6640         struct nfs4_getdeviceinfo_res res = {
6641                 .pdev = pdev,
6642         };
6643         struct rpc_message msg = {
6644                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6645                 .rpc_argp = &args,
6646                 .rpc_resp = &res,
6647         };
6648         int status;
6649
6650         dprintk("--> %s\n", __func__);
6651         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6652         dprintk("<-- %s status=%d\n", __func__, status);
6653
6654         return status;
6655 }
6656
6657 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6658 {
6659         struct nfs4_exception exception = { };
6660         int err;
6661
6662         do {
6663                 err = nfs4_handle_exception(server,
6664                                         _nfs4_proc_getdeviceinfo(server, pdev),
6665                                         &exception);
6666         } while (exception.retry);
6667         return err;
6668 }
6669 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6670
6671 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6672 {
6673         struct nfs4_layoutcommit_data *data = calldata;
6674         struct nfs_server *server = NFS_SERVER(data->args.inode);
6675
6676         if (nfs4_setup_sequence(server, &data->args.seq_args,
6677                                 &data->res.seq_res, task))
6678                 return;
6679         rpc_call_start(task);
6680 }
6681
6682 static void
6683 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6684 {
6685         struct nfs4_layoutcommit_data *data = calldata;
6686         struct nfs_server *server = NFS_SERVER(data->args.inode);
6687
6688         if (!nfs4_sequence_done(task, &data->res.seq_res))
6689                 return;
6690
6691         switch (task->tk_status) { /* Just ignore these failures */
6692         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6693         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6694         case -NFS4ERR_BADLAYOUT:     /* no layout */
6695         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6696                 task->tk_status = 0;
6697                 break;
6698         case 0:
6699                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6700                                                    data->res.fattr);
6701                 break;
6702         default:
6703                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6704                         rpc_restart_call_prepare(task);
6705                         return;
6706                 }
6707         }
6708 }
6709
6710 static void nfs4_layoutcommit_release(void *calldata)
6711 {
6712         struct nfs4_layoutcommit_data *data = calldata;
6713         struct pnfs_layout_segment *lseg, *tmp;
6714         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6715
6716         pnfs_cleanup_layoutcommit(data);
6717         /* Matched by references in pnfs_set_layoutcommit */
6718         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6719                 list_del_init(&lseg->pls_lc_list);
6720                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6721                                        &lseg->pls_flags))
6722                         pnfs_put_lseg(lseg);
6723         }
6724
6725         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6726         smp_mb__after_clear_bit();
6727         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6728
6729         put_rpccred(data->cred);
6730         kfree(data);
6731 }
6732
6733 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6734         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6735         .rpc_call_done = nfs4_layoutcommit_done,
6736         .rpc_release = nfs4_layoutcommit_release,
6737 };
6738
6739 int
6740 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6741 {
6742         struct rpc_message msg = {
6743                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6744                 .rpc_argp = &data->args,
6745                 .rpc_resp = &data->res,
6746                 .rpc_cred = data->cred,
6747         };
6748         struct rpc_task_setup task_setup_data = {
6749                 .task = &data->task,
6750                 .rpc_client = NFS_CLIENT(data->args.inode),
6751                 .rpc_message = &msg,
6752                 .callback_ops = &nfs4_layoutcommit_ops,
6753                 .callback_data = data,
6754                 .flags = RPC_TASK_ASYNC,
6755         };
6756         struct rpc_task *task;
6757         int status = 0;
6758
6759         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6760                 "lbw: %llu inode %lu\n",
6761                 data->task.tk_pid, sync,
6762                 data->args.lastbytewritten,
6763                 data->args.inode->i_ino);
6764
6765         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6766         task = rpc_run_task(&task_setup_data);
6767         if (IS_ERR(task))
6768                 return PTR_ERR(task);
6769         if (sync == false)
6770                 goto out;
6771         status = nfs4_wait_for_completion_rpc_task(task);
6772         if (status != 0)
6773                 goto out;
6774         status = task->tk_status;
6775 out:
6776         dprintk("%s: status %d\n", __func__, status);
6777         rpc_put_task(task);
6778         return status;
6779 }
6780
6781 static int
6782 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6783                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6784 {
6785         struct nfs41_secinfo_no_name_args args = {
6786                 .style = SECINFO_STYLE_CURRENT_FH,
6787         };
6788         struct nfs4_secinfo_res res = {
6789                 .flavors = flavors,
6790         };
6791         struct rpc_message msg = {
6792                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6793                 .rpc_argp = &args,
6794                 .rpc_resp = &res,
6795         };
6796         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6797 }
6798
6799 static int
6800 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6801                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6802 {
6803         struct nfs4_exception exception = { };
6804         int err;
6805         do {
6806                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6807                 switch (err) {
6808                 case 0:
6809                 case -NFS4ERR_WRONGSEC:
6810                 case -NFS4ERR_NOTSUPP:
6811                         goto out;
6812                 default:
6813                         err = nfs4_handle_exception(server, err, &exception);
6814                 }
6815         } while (exception.retry);
6816 out:
6817         return err;
6818 }
6819
6820 static int
6821 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6822                     struct nfs_fsinfo *info)
6823 {
6824         int err;
6825         struct page *page;
6826         rpc_authflavor_t flavor;
6827         struct nfs4_secinfo_flavors *flavors;
6828
6829         page = alloc_page(GFP_KERNEL);
6830         if (!page) {
6831                 err = -ENOMEM;
6832                 goto out;
6833         }
6834
6835         flavors = page_address(page);
6836         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6837
6838         /*
6839          * Fall back on "guess and check" method if
6840          * the server doesn't support SECINFO_NO_NAME
6841          */
6842         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6843                 err = nfs4_find_root_sec(server, fhandle, info);
6844                 goto out_freepage;
6845         }
6846         if (err)
6847                 goto out_freepage;
6848
6849         flavor = nfs_find_best_sec(flavors);
6850         if (err == 0)
6851                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6852
6853 out_freepage:
6854         put_page(page);
6855         if (err == -EACCES)
6856                 return -EPERM;
6857 out:
6858         return err;
6859 }
6860
6861 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6862 {
6863         int status;
6864         struct nfs41_test_stateid_args args = {
6865                 .stateid = stateid,
6866         };
6867         struct nfs41_test_stateid_res res;
6868         struct rpc_message msg = {
6869                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6870                 .rpc_argp = &args,
6871                 .rpc_resp = &res,
6872         };
6873
6874         dprintk("NFS call  test_stateid %p\n", stateid);
6875         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6876         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6877         if (status != NFS_OK) {
6878                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6879                 return status;
6880         }
6881         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6882         return -res.status;
6883 }
6884
6885 /**
6886  * nfs41_test_stateid - perform a TEST_STATEID operation
6887  *
6888  * @server: server / transport on which to perform the operation
6889  * @stateid: state ID to test
6890  *
6891  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6892  * Otherwise a negative NFS4ERR value is returned if the operation
6893  * failed or the state ID is not currently valid.
6894  */
6895 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6896 {
6897         struct nfs4_exception exception = { };
6898         int err;
6899         do {
6900                 err = _nfs41_test_stateid(server, stateid);
6901                 if (err != -NFS4ERR_DELAY)
6902                         break;
6903                 nfs4_handle_exception(server, err, &exception);
6904         } while (exception.retry);
6905         return err;
6906 }
6907
6908 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6909 {
6910         struct nfs41_free_stateid_args args = {
6911                 .stateid = stateid,
6912         };
6913         struct nfs41_free_stateid_res res;
6914         struct rpc_message msg = {
6915                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6916                 .rpc_argp = &args,
6917                 .rpc_resp = &res,
6918         };
6919         int status;
6920
6921         dprintk("NFS call  free_stateid %p\n", stateid);
6922         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6923         status = nfs4_call_sync_sequence(server->client, server, &msg,
6924                                          &args.seq_args, &res.seq_res, 1);
6925         dprintk("NFS reply free_stateid: %d\n", status);
6926         return status;
6927 }
6928
6929 /**
6930  * nfs41_free_stateid - perform a FREE_STATEID operation
6931  *
6932  * @server: server / transport on which to perform the operation
6933  * @stateid: state ID to release
6934  *
6935  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6936  * negative NFS4ERR value is returned.
6937  */
6938 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6939 {
6940         struct nfs4_exception exception = { };
6941         int err;
6942         do {
6943                 err = _nfs4_free_stateid(server, stateid);
6944                 if (err != -NFS4ERR_DELAY)
6945                         break;
6946                 nfs4_handle_exception(server, err, &exception);
6947         } while (exception.retry);
6948         return err;
6949 }
6950
6951 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6952                 const nfs4_stateid *s2)
6953 {
6954         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6955                 return false;
6956
6957         if (s1->seqid == s2->seqid)
6958                 return true;
6959         if (s1->seqid == 0 || s2->seqid == 0)
6960                 return true;
6961
6962         return false;
6963 }
6964
6965 #endif /* CONFIG_NFS_V4_1 */
6966
6967 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6968                 const nfs4_stateid *s2)
6969 {
6970         return nfs4_stateid_match(s1, s2);
6971 }
6972
6973
6974 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6975         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6976         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6977         .recover_open   = nfs4_open_reclaim,
6978         .recover_lock   = nfs4_lock_reclaim,
6979         .establish_clid = nfs4_init_clientid,
6980         .get_clid_cred  = nfs4_get_setclientid_cred,
6981         .detect_trunking = nfs40_discover_server_trunking,
6982 };
6983
6984 #if defined(CONFIG_NFS_V4_1)
6985 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6986         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6987         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6988         .recover_open   = nfs4_open_reclaim,
6989         .recover_lock   = nfs4_lock_reclaim,
6990         .establish_clid = nfs41_init_clientid,
6991         .get_clid_cred  = nfs4_get_exchange_id_cred,
6992         .reclaim_complete = nfs41_proc_reclaim_complete,
6993         .detect_trunking = nfs41_discover_server_trunking,
6994 };
6995 #endif /* CONFIG_NFS_V4_1 */
6996
6997 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6998         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6999         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7000         .recover_open   = nfs4_open_expired,
7001         .recover_lock   = nfs4_lock_expired,
7002         .establish_clid = nfs4_init_clientid,
7003         .get_clid_cred  = nfs4_get_setclientid_cred,
7004 };
7005
7006 #if defined(CONFIG_NFS_V4_1)
7007 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
7008         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7009         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7010         .recover_open   = nfs41_open_expired,
7011         .recover_lock   = nfs41_lock_expired,
7012         .establish_clid = nfs41_init_clientid,
7013         .get_clid_cred  = nfs4_get_exchange_id_cred,
7014 };
7015 #endif /* CONFIG_NFS_V4_1 */
7016
7017 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
7018         .sched_state_renewal = nfs4_proc_async_renew,
7019         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
7020         .renew_lease = nfs4_proc_renew,
7021 };
7022
7023 #if defined(CONFIG_NFS_V4_1)
7024 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
7025         .sched_state_renewal = nfs41_proc_async_sequence,
7026         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
7027         .renew_lease = nfs4_proc_sequence,
7028 };
7029 #endif
7030
7031 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
7032         .minor_version = 0,
7033         .call_sync = _nfs4_call_sync,
7034         .match_stateid = nfs4_match_stateid,
7035         .find_root_sec = nfs4_find_root_sec,
7036         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
7037         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
7038         .state_renewal_ops = &nfs40_state_renewal_ops,
7039 };
7040
7041 #if defined(CONFIG_NFS_V4_1)
7042 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
7043         .minor_version = 1,
7044         .call_sync = _nfs4_call_sync_session,
7045         .match_stateid = nfs41_match_stateid,
7046         .find_root_sec = nfs41_find_root_sec,
7047         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7048         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7049         .state_renewal_ops = &nfs41_state_renewal_ops,
7050 };
7051 #endif
7052
7053 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
7054         [0] = &nfs_v4_0_minor_ops,
7055 #if defined(CONFIG_NFS_V4_1)
7056         [1] = &nfs_v4_1_minor_ops,
7057 #endif
7058 };
7059
7060 const struct inode_operations nfs4_dir_inode_operations = {
7061         .create         = nfs_create,
7062         .lookup         = nfs_lookup,
7063         .atomic_open    = nfs_atomic_open,
7064         .link           = nfs_link,
7065         .unlink         = nfs_unlink,
7066         .symlink        = nfs_symlink,
7067         .mkdir          = nfs_mkdir,
7068         .rmdir          = nfs_rmdir,
7069         .mknod          = nfs_mknod,
7070         .rename         = nfs_rename,
7071         .permission     = nfs_permission,
7072         .getattr        = nfs_getattr,
7073         .setattr        = nfs_setattr,
7074         .getxattr       = generic_getxattr,
7075         .setxattr       = generic_setxattr,
7076         .listxattr      = generic_listxattr,
7077         .removexattr    = generic_removexattr,
7078 };
7079
7080 static const struct inode_operations nfs4_file_inode_operations = {
7081         .permission     = nfs_permission,
7082         .getattr        = nfs_getattr,
7083         .setattr        = nfs_setattr,
7084         .getxattr       = generic_getxattr,
7085         .setxattr       = generic_setxattr,
7086         .listxattr      = generic_listxattr,
7087         .removexattr    = generic_removexattr,
7088 };
7089
7090 const struct nfs_rpc_ops nfs_v4_clientops = {
7091         .version        = 4,                    /* protocol version */
7092         .dentry_ops     = &nfs4_dentry_operations,
7093         .dir_inode_ops  = &nfs4_dir_inode_operations,
7094         .file_inode_ops = &nfs4_file_inode_operations,
7095         .file_ops       = &nfs4_file_operations,
7096         .getroot        = nfs4_proc_get_root,
7097         .submount       = nfs4_submount,
7098         .try_mount      = nfs4_try_mount,
7099         .getattr        = nfs4_proc_getattr,
7100         .setattr        = nfs4_proc_setattr,
7101         .lookup         = nfs4_proc_lookup,
7102         .access         = nfs4_proc_access,
7103         .readlink       = nfs4_proc_readlink,
7104         .create         = nfs4_proc_create,
7105         .remove         = nfs4_proc_remove,
7106         .unlink_setup   = nfs4_proc_unlink_setup,
7107         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
7108         .unlink_done    = nfs4_proc_unlink_done,
7109         .rename         = nfs4_proc_rename,
7110         .rename_setup   = nfs4_proc_rename_setup,
7111         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
7112         .rename_done    = nfs4_proc_rename_done,
7113         .link           = nfs4_proc_link,
7114         .symlink        = nfs4_proc_symlink,
7115         .mkdir          = nfs4_proc_mkdir,
7116         .rmdir          = nfs4_proc_remove,
7117         .readdir        = nfs4_proc_readdir,
7118         .mknod          = nfs4_proc_mknod,
7119         .statfs         = nfs4_proc_statfs,
7120         .fsinfo         = nfs4_proc_fsinfo,
7121         .pathconf       = nfs4_proc_pathconf,
7122         .set_capabilities = nfs4_server_capabilities,
7123         .decode_dirent  = nfs4_decode_dirent,
7124         .read_setup     = nfs4_proc_read_setup,
7125         .read_pageio_init = pnfs_pageio_init_read,
7126         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
7127         .read_done      = nfs4_read_done,
7128         .write_setup    = nfs4_proc_write_setup,
7129         .write_pageio_init = pnfs_pageio_init_write,
7130         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
7131         .write_done     = nfs4_write_done,
7132         .commit_setup   = nfs4_proc_commit_setup,
7133         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
7134         .commit_done    = nfs4_commit_done,
7135         .lock           = nfs4_proc_lock,
7136         .clear_acl_cache = nfs4_zap_acl_attr,
7137         .close_context  = nfs4_close_context,
7138         .open_context   = nfs4_atomic_open,
7139         .have_delegation = nfs4_have_delegation,
7140         .return_delegation = nfs4_inode_return_delegation,
7141         .alloc_client   = nfs4_alloc_client,
7142         .init_client    = nfs4_init_client,
7143         .free_client    = nfs4_free_client,
7144         .create_server  = nfs4_create_server,
7145         .clone_server   = nfs_clone_server,
7146 };
7147
7148 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
7149         .prefix = XATTR_NAME_NFSV4_ACL,
7150         .list   = nfs4_xattr_list_nfs4_acl,
7151         .get    = nfs4_xattr_get_nfs4_acl,
7152         .set    = nfs4_xattr_set_nfs4_acl,
7153 };
7154
7155 const struct xattr_handler *nfs4_xattr_handlers[] = {
7156         &nfs4_xattr_nfs4_acl_handler,
7157         NULL
7158 };
7159
7160 /*
7161  * Local variables:
7162  *  c-basic-offset: 8
7163  * End:
7164  */