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         if (cookie > 2) {
 210                 readdir->cookie = cookie;
 211                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 212                 return;
 213         }
 214
 215         readdir->cookie = 0;
 216         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 217         if (cookie == 2)
 218                 return;
 219
 220         /*
 221          * NFSv4 servers do not return entries for '.' and '..'
 222          * Therefore, we fake these entries here.  We let '.'
 223          * have cookie 0 and '..' have cookie 1.  Note that
 224          * when talking to the server, we always send cookie 0
 225          * instead of 1 or 2.
 226          */
 227         start = p = kmap_atomic(*readdir->pages);
 228
 229         if (cookie == 0) {
 230                 *p++ = xdr_one;                                  /* next */
 231                 *p++ = xdr_zero;                   /* cookie, first word */
 232                 *p++ = xdr_one;                   /* cookie, second word */
 233                 *p++ = xdr_one;                             /* entry len */
 234                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 235                 p++;
 236                 *p++ = xdr_one;                         /* bitmap length */
 237                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 238                 *p++ = htonl(8);              /* attribute buffer length */
 239                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 240         }
 241
 242         *p++ = xdr_one;                                  /* next */
 243         *p++ = xdr_zero;                   /* cookie, first word */
 244         *p++ = xdr_two;                   /* cookie, second word */
 245         *p++ = xdr_two;                             /* entry len */
 246         memcpy(p, "..\0\0", 4);                         /* entry */
 247         p++;
 248         *p++ = xdr_one;                         /* bitmap length */
 249         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 250         *p++ = htonl(8);              /* attribute buffer length */
 251         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 252
 253         readdir->pgbase = (char *)p - (char *)start;
 254         readdir->count -= readdir->pgbase;
 255         kunmap_atomic(start);
 256 }
 257
 258 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 259 {
 260         int res;
 261
 262         might_sleep();
 263
 264         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 265                         nfs_wait_bit_killable, TASK_KILLABLE);
 266         if (res)
 267                 return res;
 268
 269         if (clp->cl_cons_state < 0)
 270                 return clp->cl_cons_state;
 271         return 0;
 272 }
 273
 274 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 275 {
 276         int res = 0;
 277
 278         might_sleep();
 279
 280         if (*timeout <= 0)
 281                 *timeout = NFS4_POLL_RETRY_MIN;
 282         if (*timeout > NFS4_POLL_RETRY_MAX)
 283                 *timeout = NFS4_POLL_RETRY_MAX;
 284         freezable_schedule_timeout_killable(*timeout);
 285         if (fatal_signal_pending(current))
 286                 res = -ERESTARTSYS;
 287         *timeout <<= 1;
 288         return res;
 289 }
 290
 291 /* This is the error handling routine for processes that are allowed
 292  * to sleep.
 293  */
 294 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 295 {
 296         struct nfs_client *clp = server->nfs_client;
 297         struct nfs4_state *state = exception->state;
 298         struct inode *inode = exception->inode;
 299         int ret = errorcode;
 300
 301         exception->retry = 0;
 302         switch(errorcode) {
 303                 case 0:
 304                         return 0;
 305                 case -NFS4ERR_OPENMODE:
 306                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 307                                 nfs4_inode_return_delegation(inode);
 308                                 exception->retry = 1;
 309                                 return 0;
 310                         }
 311                         if (state == NULL)
 312                                 break;
 313                         nfs4_schedule_stateid_recovery(server, state);
 314                         goto wait_on_recovery;
 315                 case -NFS4ERR_DELEG_REVOKED:
 316                 case -NFS4ERR_ADMIN_REVOKED:
 317                 case -NFS4ERR_BAD_STATEID:
 318                         if (state == NULL)
 319                                 break;
 320                         nfs_remove_bad_delegation(state->inode);
 321                         nfs4_schedule_stateid_recovery(server, state);
 322                         goto wait_on_recovery;
 323                 case -NFS4ERR_EXPIRED:
 324                         if (state != NULL)
 325                                 nfs4_schedule_stateid_recovery(server, state);
 326                 case -NFS4ERR_STALE_STATEID:
 327                 case -NFS4ERR_STALE_CLIENTID:
 328                         nfs4_schedule_lease_recovery(clp);
 329                         goto wait_on_recovery;
 330 #if defined(CONFIG_NFS_V4_1)
 331                 case -NFS4ERR_BADSESSION:
 332                 case -NFS4ERR_BADSLOT:
 333                 case -NFS4ERR_BAD_HIGH_SLOT:
 334                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 335                 case -NFS4ERR_DEADSESSION:
 336                 case -NFS4ERR_SEQ_FALSE_RETRY:
 337                 case -NFS4ERR_SEQ_MISORDERED:
 338                         dprintk("%s ERROR: %d Reset session\n", __func__,
 339                                 errorcode);
 340                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 341                         goto wait_on_recovery;
 342 #endif /* defined(CONFIG_NFS_V4_1) */
 343                 case -NFS4ERR_FILE_OPEN:
 344                         if (exception->timeout > HZ) {
 345                                 /* We have retried a decent amount, time to
 346                                  * fail
 347                                  */
 348                                 ret = -EBUSY;
 349                                 break;
 350                         }
 351                 case -NFS4ERR_GRACE:
 352                 case -NFS4ERR_DELAY:
 353                 case -EKEYEXPIRED:
 354                         ret = nfs4_delay(server->client, &exception->timeout);
 355                         if (ret != 0)
 356                                 break;
 357                 case -NFS4ERR_RETRY_UNCACHED_REP:
 358                 case -NFS4ERR_OLD_STATEID:
 359                         exception->retry = 1;
 360                         break;
 361                 case -NFS4ERR_BADOWNER:
 362                         /* The following works around a Linux server bug! */
 363                 case -NFS4ERR_BADNAME:
 364                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 365                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 366                                 exception->retry = 1;
 367                                 printk(KERN_WARNING "NFS: v4 server %s "
 368                                                 "does not accept raw "
 369                                                 "uid/gids. "
 370                                                 "Reenabling the idmapper.\n",
 371                                                 server->nfs_client->cl_hostname);
 372                         }
 373         }
 374         /* We failed to handle the error */
 375         return nfs4_map_errors(ret);
 376 wait_on_recovery:
 377         ret = nfs4_wait_clnt_recover(clp);
 378         if (ret == 0)
 379                 exception->retry = 1;
 380         return ret;
 381 }
 382
 383
 384 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 385 {
 386         spin_lock(&clp->cl_lock);
 387         if (time_before(clp->cl_last_renewal,timestamp))
 388                 clp->cl_last_renewal = timestamp;
 389         spin_unlock(&clp->cl_lock);
 390 }
 391
 392 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 393 {
 394         do_renew_lease(server->nfs_client, timestamp);
 395 }
 396
 397 #if defined(CONFIG_NFS_V4_1)
 398
 399 /*
 400  * nfs4_free_slot - free a slot and efficiently update slot table.
 401  *
 402  * freeing a slot is trivially done by clearing its respective bit
 403  * in the bitmap.
 404  * If the freed slotid equals highest_used_slotid we want to update it
 405  * so that the server would be able to size down the slot table if needed,
 406  * otherwise we know that the highest_used_slotid is still in use.
 407  * When updating highest_used_slotid there may be "holes" in the bitmap
 408  * so we need to scan down from highest_used_slotid to 0 looking for the now
 409  * highest slotid in use.
 410  * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
 411  *
 412  * Must be called while holding tbl->slot_tbl_lock
 413  */
 414 static void
 415 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot)
 416 {
 417         u32 slotid = slot->slot_nr;
 418
 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                 u32 new_max = find_last_bit(tbl->used_slots, slotid);
 425                 if (new_max < slotid)
 426                         tbl->highest_used_slotid = new_max;
 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_session *session;
 473         struct nfs4_slot_table *tbl;
 474
 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         tbl = res->sr_slot->table;
 482         session = tbl->session;
 483
 484         spin_lock(&tbl->slot_tbl_lock);
 485         nfs4_free_slot(tbl, res->sr_slot);
 486         nfs4_check_drain_fc_complete(session);
 487         spin_unlock(&tbl->slot_tbl_lock);
 488         res->sr_slot = NULL;
 489 }
 490
 491 /* Update the client's idea of target_highest_slotid */
 492 static void nfs41_set_target_slotid_locked(struct nfs4_slot_table *tbl,
 493                 u32 target_highest_slotid)
 494 {
 495         if (tbl->target_highest_slotid == target_highest_slotid)
 496                 return;
 497         tbl->target_highest_slotid = target_highest_slotid;
 498         tbl->generation++;
 499 }
 500
 501 void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
 502                 u32 target_highest_slotid)
 503 {
 504         spin_lock(&tbl->slot_tbl_lock);
 505         nfs41_set_target_slotid_locked(tbl, target_highest_slotid);
 506         spin_unlock(&tbl->slot_tbl_lock);
 507 }
 508
 509 static void nfs41_set_server_slotid_locked(struct nfs4_slot_table *tbl,
 510                 u32 highest_slotid)
 511 {
 512         unsigned int max_slotid, i;
 513
 514         if (tbl->server_highest_slotid == highest_slotid)
 515                 return;
 516         if (tbl->highest_used_slotid > highest_slotid)
 517                 return;
 518         max_slotid = min(tbl->max_slots - 1, highest_slotid);
 519         /* Reset the seq_nr for deallocated slots */
 520         for (i = tbl->server_highest_slotid + 1; i <= max_slotid; i++)
 521                 tbl->slots[i].seq_nr = 1;
 522         tbl->server_highest_slotid = highest_slotid;
 523 }
 524
 525 static void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
 526                 struct nfs4_slot *slot,
 527                 struct nfs4_sequence_res *res)
 528 {
 529         spin_lock(&tbl->slot_tbl_lock);
 530         if (tbl->generation != slot->generation)
 531                 goto out;
 532         nfs41_set_server_slotid_locked(tbl, res->sr_highest_slotid);
 533         nfs41_set_target_slotid_locked(tbl, res->sr_target_highest_slotid);
 534 out:
 535         spin_unlock(&tbl->slot_tbl_lock);
 536 }
 537
 538 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 539 {
 540         struct nfs4_session *session;
 541         struct nfs4_slot *slot;
 542         unsigned long timestamp;
 543         struct nfs_client *clp;
 544
 545         /*
 546          * sr_status remains 1 if an RPC level error occurred. The server
 547          * may or may not have processed the sequence operation..
 548          * Proceed as if the server received and processed the sequence
 549          * operation.
 550          */
 551         if (res->sr_status == 1)
 552                 res->sr_status = NFS_OK;
 553
 554         /* don't increment the sequence number if the task wasn't sent */
 555         if (!RPC_WAS_SENT(task))
 556                 goto out;
 557
 558         slot = res->sr_slot;
 559         session = slot->table->session;
 560
 561         /* Check the SEQUENCE operation status */
 562         switch (res->sr_status) {
 563         case 0:
 564                 /* Update the slot's sequence and clientid lease timer */
 565                 ++slot->seq_nr;
 566                 timestamp = slot->renewal_time;
 567                 clp = session->clp;
 568                 do_renew_lease(clp, timestamp);
 569                 /* Check sequence flags */
 570                 if (res->sr_status_flags != 0)
 571                         nfs4_schedule_lease_recovery(clp);
 572                 nfs41_update_target_slotid(slot->table, slot, res);
 573                 break;
 574         case -NFS4ERR_DELAY:
 575                 /* The server detected a resend of the RPC call and
 576                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 577                  * of RFC5661.
 578                  */
 579                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 580                         __func__,
 581                         slot->slot_nr,
 582                         slot->seq_nr);
 583                 goto out_retry;
 584         default:
 585                 /* Just update the slot sequence no. */
 586                 ++slot->seq_nr;
 587         }
 588 out:
 589         /* The session may be reset by one of the error handlers. */
 590         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 591         nfs41_sequence_free_slot(res);
 592         return 1;
 593 out_retry:
 594         if (!rpc_restart_call(task))
 595                 goto out;
 596         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 597         return 0;
 598 }
 599
 600 static int nfs4_sequence_done(struct rpc_task *task,
 601                                struct nfs4_sequence_res *res)
 602 {
 603         if (res->sr_slot == NULL)
 604                 return 1;
 605         return nfs41_sequence_done(task, res);
 606 }
 607
 608 /*
 609  * nfs4_alloc_slot - efficiently look for a free slot
 610  *
 611  * nfs4_alloc_slot looks for an unset bit in the used_slots bitmap.
 612  * If found, we mark the slot as used, update the highest_used_slotid,
 613  * and respectively set up the sequence operation args.
 614  *
 615  * Note: must be called with under the slot_tbl_lock.
 616  */
 617 static struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl)
 618 {
 619         struct nfs4_slot *ret = NULL;
 620         u32 slotid;
 621
 622         dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
 623                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 624                 tbl->max_slots);
 625         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 626         if (slotid >= tbl->max_slots)
 627                 goto out;
 628         __set_bit(slotid, tbl->used_slots);
 629         if (slotid > tbl->highest_used_slotid ||
 630                         tbl->highest_used_slotid == NFS4_NO_SLOT)
 631                 tbl->highest_used_slotid = slotid;
 632         ret = &tbl->slots[slotid];
 633         ret->renewal_time = jiffies;
 634         ret->generation = tbl->generation;
 635
 636 out:
 637         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 638                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 639                 ret ? ret->slot_nr : -1);
 640         return ret;
 641 }
 642
 643 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 644                 struct nfs4_sequence_res *res, int cache_reply)
 645 {
 646         args->sa_slot = NULL;
 647         args->sa_cache_this = 0;
 648         if (cache_reply)
 649                 args->sa_cache_this = 1;
 650         res->sr_slot = NULL;
 651 }
 652
 653 int nfs41_setup_sequence(struct nfs4_session *session,
 654                                 struct nfs4_sequence_args *args,
 655                                 struct nfs4_sequence_res *res,
 656                                 struct rpc_task *task)
 657 {
 658         struct nfs4_slot *slot;
 659         struct nfs4_slot_table *tbl;
 660
 661         dprintk("--> %s\n", __func__);
 662         /* slot already allocated? */
 663         if (res->sr_slot != NULL)
 664                 return 0;
 665
 666         tbl = &session->fc_slot_table;
 667
 668         spin_lock(&tbl->slot_tbl_lock);
 669         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 670             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 671                 /* The state manager will wait until the slot table is empty */
 672                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 673                 spin_unlock(&tbl->slot_tbl_lock);
 674                 dprintk("%s session is draining\n", __func__);
 675                 return -EAGAIN;
 676         }
 677
 678         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 679             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 680                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 681                 spin_unlock(&tbl->slot_tbl_lock);
 682                 dprintk("%s enforce FIFO order\n", __func__);
 683                 return -EAGAIN;
 684         }
 685
 686         slot = nfs4_alloc_slot(tbl);
 687         if (slot == NULL) {
 688                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 689                 spin_unlock(&tbl->slot_tbl_lock);
 690                 dprintk("<-- %s: no free slots\n", __func__);
 691                 return -EAGAIN;
 692         }
 693         spin_unlock(&tbl->slot_tbl_lock);
 694
 695         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 696
 697         args->sa_slot = slot;
 698
 699         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 700                         slot->slot_nr, slot->seq_nr);
 701
 702         res->sr_slot = slot;
 703         res->sr_status_flags = 0;
 704         /*
 705          * sr_status is only set in decode_sequence, and so will remain
 706          * set to 1 if an rpc level failure occurs.
 707          */
 708         res->sr_status = 1;
 709         return 0;
 710 }
 711 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 712
 713 int nfs4_setup_sequence(const struct nfs_server *server,
 714                         struct nfs4_sequence_args *args,
 715                         struct nfs4_sequence_res *res,
 716                         struct rpc_task *task)
 717 {
 718         struct nfs4_session *session = nfs4_get_session(server);
 719         int ret = 0;
 720
 721         if (session == NULL)
 722                 goto out;
 723
 724         dprintk("--> %s clp %p session %p sr_slot %d\n",
 725                 __func__, session->clp, session, res->sr_slot ?
 726                         res->sr_slot->slot_nr : -1);
 727
 728         ret = nfs41_setup_sequence(session, args, res, task);
 729 out:
 730         dprintk("<-- %s status=%d\n", __func__, ret);
 731         return ret;
 732 }
 733
 734 struct nfs41_call_sync_data {
 735         const struct nfs_server *seq_server;
 736         struct nfs4_sequence_args *seq_args;
 737         struct nfs4_sequence_res *seq_res;
 738 };
 739
 740 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 741 {
 742         struct nfs41_call_sync_data *data = calldata;
 743
 744         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 745
 746         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 747                                 data->seq_res, task))
 748                 return;
 749         rpc_call_start(task);
 750 }
 751
 752 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 753 {
 754         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 755         nfs41_call_sync_prepare(task, calldata);
 756 }
 757
 758 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 759 {
 760         struct nfs41_call_sync_data *data = calldata;
 761
 762         nfs41_sequence_done(task, data->seq_res);
 763 }
 764
 765 static const struct rpc_call_ops nfs41_call_sync_ops = {
 766         .rpc_call_prepare = nfs41_call_sync_prepare,
 767         .rpc_call_done = nfs41_call_sync_done,
 768 };
 769
 770 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 771         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 772         .rpc_call_done = nfs41_call_sync_done,
 773 };
 774
 775 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 776                                    struct nfs_server *server,
 777                                    struct rpc_message *msg,
 778                                    struct nfs4_sequence_args *args,
 779                                    struct nfs4_sequence_res *res,
 780                                    int privileged)
 781 {
 782         int ret;
 783         struct rpc_task *task;
 784         struct nfs41_call_sync_data data = {
 785                 .seq_server = server,
 786                 .seq_args = args,
 787                 .seq_res = res,
 788         };
 789         struct rpc_task_setup task_setup = {
 790                 .rpc_client = clnt,
 791                 .rpc_message = msg,
 792                 .callback_ops = &nfs41_call_sync_ops,
 793                 .callback_data = &data
 794         };
 795
 796         if (privileged)
 797                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 798         task = rpc_run_task(&task_setup);
 799         if (IS_ERR(task))
 800                 ret = PTR_ERR(task);
 801         else {
 802                 ret = task->tk_status;
 803                 rpc_put_task(task);
 804         }
 805         return ret;
 806 }
 807
 808 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 809                             struct nfs_server *server,
 810                             struct rpc_message *msg,
 811                             struct nfs4_sequence_args *args,
 812                             struct nfs4_sequence_res *res,
 813                             int cache_reply)
 814 {
 815         nfs41_init_sequence(args, res, cache_reply);
 816         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 817 }
 818
 819 #else
 820 static inline
 821 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 822                 struct nfs4_sequence_res *res, int cache_reply)
 823 {
 824 }
 825
 826 static int nfs4_sequence_done(struct rpc_task *task,
 827                                struct nfs4_sequence_res *res)
 828 {
 829         return 1;
 830 }
 831 #endif /* CONFIG_NFS_V4_1 */
 832
 833 int _nfs4_call_sync(struct rpc_clnt *clnt,
 834                     struct nfs_server *server,
 835                     struct rpc_message *msg,
 836                     struct nfs4_sequence_args *args,
 837                     struct nfs4_sequence_res *res,
 838                     int cache_reply)
 839 {
 840         nfs41_init_sequence(args, res, cache_reply);
 841         return rpc_call_sync(clnt, msg, 0);
 842 }
 843
 844 static inline
 845 int nfs4_call_sync(struct rpc_clnt *clnt,
 846                    struct nfs_server *server,
 847                    struct rpc_message *msg,
 848                    struct nfs4_sequence_args *args,
 849                    struct nfs4_sequence_res *res,
 850                    int cache_reply)
 851 {
 852         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 853                                                 args, res, cache_reply);
 854 }
 855
 856 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 857 {
 858         struct nfs_inode *nfsi = NFS_I(dir);
 859
 860         spin_lock(&dir->i_lock);
 861         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 862         if (!cinfo->atomic || cinfo->before != dir->i_version)
 863                 nfs_force_lookup_revalidate(dir);
 864         dir->i_version = cinfo->after;
 865         spin_unlock(&dir->i_lock);
 866 }
 867
 868 struct nfs4_opendata {
 869         struct kref kref;
 870         struct nfs_openargs o_arg;
 871         struct nfs_openres o_res;
 872         struct nfs_open_confirmargs c_arg;
 873         struct nfs_open_confirmres c_res;
 874         struct nfs4_string owner_name;
 875         struct nfs4_string group_name;
 876         struct nfs_fattr f_attr;
 877         struct dentry *dir;
 878         struct dentry *dentry;
 879         struct nfs4_state_owner *owner;
 880         struct nfs4_state *state;
 881         struct iattr attrs;
 882         unsigned long timestamp;
 883         unsigned int rpc_done : 1;
 884         int rpc_status;
 885         int cancelled;
 886 };
 887
 888
 889 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 890 {
 891         p->o_res.f_attr = &p->f_attr;
 892         p->o_res.seqid = p->o_arg.seqid;
 893         p->c_res.seqid = p->c_arg.seqid;
 894         p->o_res.server = p->o_arg.server;
 895         p->o_res.access_request = p->o_arg.access;
 896         nfs_fattr_init(&p->f_attr);
 897         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 898 }
 899
 900 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 901                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 902                 const struct iattr *attrs,
 903                 gfp_t gfp_mask)
 904 {
 905         struct dentry *parent = dget_parent(dentry);
 906         struct inode *dir = parent->d_inode;
 907         struct nfs_server *server = NFS_SERVER(dir);
 908         struct nfs4_opendata *p;
 909
 910         p = kzalloc(sizeof(*p), gfp_mask);
 911         if (p == NULL)
 912                 goto err;
 913         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 914         if (p->o_arg.seqid == NULL)
 915                 goto err_free;
 916         nfs_sb_active(dentry->d_sb);
 917         p->dentry = dget(dentry);
 918         p->dir = parent;
 919         p->owner = sp;
 920         atomic_inc(&sp->so_count);
 921         p->o_arg.fh = NFS_FH(dir);
 922         p->o_arg.open_flags = flags;
 923         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 924         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 925          * will return permission denied for all bits until close */
 926         if (!(flags & O_EXCL)) {
 927                 /* ask server to check for all possible rights as results
 928                  * are cached */
 929                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 930                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 931         }
 932         p->o_arg.clientid = server->nfs_client->cl_clientid;
 933         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 934         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 935         p->o_arg.name = &dentry->d_name;
 936         p->o_arg.server = server;
 937         p->o_arg.bitmask = server->attr_bitmask;
 938         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 939         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 940         if (attrs != NULL && attrs->ia_valid != 0) {
 941                 __be32 verf[2];
 942
 943                 p->o_arg.u.attrs = &p->attrs;
 944                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 945
 946                 verf[0] = jiffies;
 947                 verf[1] = current->pid;
 948                 memcpy(p->o_arg.u.verifier.data, verf,
 949                                 sizeof(p->o_arg.u.verifier.data));
 950         }
 951         p->c_arg.fh = &p->o_res.fh;
 952         p->c_arg.stateid = &p->o_res.stateid;
 953         p->c_arg.seqid = p->o_arg.seqid;
 954         nfs4_init_opendata_res(p);
 955         kref_init(&p->kref);
 956         return p;
 957 err_free:
 958         kfree(p);
 959 err:
 960         dput(parent);
 961         return NULL;
 962 }
 963
 964 static void nfs4_opendata_free(struct kref *kref)
 965 {
 966         struct nfs4_opendata *p = container_of(kref,
 967                         struct nfs4_opendata, kref);
 968         struct super_block *sb = p->dentry->d_sb;
 969
 970         nfs_free_seqid(p->o_arg.seqid);
 971         if (p->state != NULL)
 972                 nfs4_put_open_state(p->state);
 973         nfs4_put_state_owner(p->owner);
 974         dput(p->dir);
 975         dput(p->dentry);
 976         nfs_sb_deactive(sb);
 977         nfs_fattr_free_names(&p->f_attr);
 978         kfree(p);
 979 }
 980
 981 static void nfs4_opendata_put(struct nfs4_opendata *p)
 982 {
 983         if (p != NULL)
 984                 kref_put(&p->kref, nfs4_opendata_free);
 985 }
 986
 987 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 988 {
 989         int ret;
 990
 991         ret = rpc_wait_for_completion_task(task);
 992         return ret;
 993 }
 994
 995 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 996 {
 997         int ret = 0;
 998
 999         if (open_mode & (O_EXCL|O_TRUNC))
1000                 goto out;
1001         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1002                 case FMODE_READ:
1003                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1004                                 && state->n_rdonly != 0;
1005                         break;
1006                 case FMODE_WRITE:
1007                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1008                                 && state->n_wronly != 0;
1009                         break;
1010                 case FMODE_READ|FMODE_WRITE:
1011                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1012                                 && state->n_rdwr != 0;
1013         }
1014 out:
1015         return ret;
1016 }
1017
1018 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1019 {
1020         if (delegation == NULL)
1021                 return 0;
1022         if ((delegation->type & fmode) != fmode)
1023                 return 0;
1024         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1025                 return 0;
1026         nfs_mark_delegation_referenced(delegation);
1027         return 1;
1028 }
1029
1030 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1031 {
1032         switch (fmode) {
1033                 case FMODE_WRITE:
1034                         state->n_wronly++;
1035                         break;
1036                 case FMODE_READ:
1037                         state->n_rdonly++;
1038                         break;
1039                 case FMODE_READ|FMODE_WRITE:
1040                         state->n_rdwr++;
1041         }
1042         nfs4_state_set_mode_locked(state, state->state | fmode);
1043 }
1044
1045 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1046 {
1047         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1048                 nfs4_stateid_copy(&state->stateid, stateid);
1049         nfs4_stateid_copy(&state->open_stateid, stateid);
1050         switch (fmode) {
1051                 case FMODE_READ:
1052                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1053                         break;
1054                 case FMODE_WRITE:
1055                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1056                         break;
1057                 case FMODE_READ|FMODE_WRITE:
1058                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1059         }
1060 }
1061
1062 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1063 {
1064         write_seqlock(&state->seqlock);
1065         nfs_set_open_stateid_locked(state, stateid, fmode);
1066         write_sequnlock(&state->seqlock);
1067 }
1068
1069 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1070 {
1071         /*
1072          * Protect the call to nfs4_state_set_mode_locked and
1073          * serialise the stateid update
1074          */
1075         write_seqlock(&state->seqlock);
1076         if (deleg_stateid != NULL) {
1077                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1078                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1079         }
1080         if (open_stateid != NULL)
1081                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1082         write_sequnlock(&state->seqlock);
1083         spin_lock(&state->owner->so_lock);
1084         update_open_stateflags(state, fmode);
1085         spin_unlock(&state->owner->so_lock);
1086 }
1087
1088 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1089 {
1090         struct nfs_inode *nfsi = NFS_I(state->inode);
1091         struct nfs_delegation *deleg_cur;
1092         int ret = 0;
1093
1094         fmode &= (FMODE_READ|FMODE_WRITE);
1095
1096         rcu_read_lock();
1097         deleg_cur = rcu_dereference(nfsi->delegation);
1098         if (deleg_cur == NULL)
1099                 goto no_delegation;
1100
1101         spin_lock(&deleg_cur->lock);
1102         if (nfsi->delegation != deleg_cur ||
1103             (deleg_cur->type & fmode) != fmode)
1104                 goto no_delegation_unlock;
1105
1106         if (delegation == NULL)
1107                 delegation = &deleg_cur->stateid;
1108         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1109                 goto no_delegation_unlock;
1110
1111         nfs_mark_delegation_referenced(deleg_cur);
1112         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1113         ret = 1;
1114 no_delegation_unlock:
1115         spin_unlock(&deleg_cur->lock);
1116 no_delegation:
1117         rcu_read_unlock();
1118
1119         if (!ret && open_stateid != NULL) {
1120                 __update_open_stateid(state, open_stateid, NULL, fmode);
1121                 ret = 1;
1122         }
1123
1124         return ret;
1125 }
1126
1127
1128 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1129 {
1130         struct nfs_delegation *delegation;
1131
1132         rcu_read_lock();
1133         delegation = rcu_dereference(NFS_I(inode)->delegation);
1134         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1135                 rcu_read_unlock();
1136                 return;
1137         }
1138         rcu_read_unlock();
1139         nfs4_inode_return_delegation(inode);
1140 }
1141
1142 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1143 {
1144         struct nfs4_state *state = opendata->state;
1145         struct nfs_inode *nfsi = NFS_I(state->inode);
1146         struct nfs_delegation *delegation;
1147         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1148         fmode_t fmode = opendata->o_arg.fmode;
1149         nfs4_stateid stateid;
1150         int ret = -EAGAIN;
1151
1152         for (;;) {
1153                 if (can_open_cached(state, fmode, open_mode)) {
1154                         spin_lock(&state->owner->so_lock);
1155                         if (can_open_cached(state, fmode, open_mode)) {
1156                                 update_open_stateflags(state, fmode);
1157                                 spin_unlock(&state->owner->so_lock);
1158                                 goto out_return_state;
1159                         }
1160                         spin_unlock(&state->owner->so_lock);
1161                 }
1162                 rcu_read_lock();
1163                 delegation = rcu_dereference(nfsi->delegation);
1164                 if (!can_open_delegated(delegation, fmode)) {
1165                         rcu_read_unlock();
1166                         break;
1167                 }
1168                 /* Save the delegation */
1169                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1170                 rcu_read_unlock();
1171                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1172                 if (ret != 0)
1173                         goto out;
1174                 ret = -EAGAIN;
1175
1176                 /* Try to update the stateid using the delegation */
1177                 if (update_open_stateid(state, NULL, &stateid, fmode))
1178                         goto out_return_state;
1179         }
1180 out:
1181         return ERR_PTR(ret);
1182 out_return_state:
1183         atomic_inc(&state->count);
1184         return state;
1185 }
1186
1187 static void
1188 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1189 {
1190         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1191         struct nfs_delegation *delegation;
1192         int delegation_flags = 0;
1193
1194         rcu_read_lock();
1195         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1196         if (delegation)
1197                 delegation_flags = delegation->flags;
1198         rcu_read_unlock();
1199         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1200                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1201                                    "returning a delegation for "
1202                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1203                                    clp->cl_hostname);
1204         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1205                 nfs_inode_set_delegation(state->inode,
1206                                          data->owner->so_cred,
1207                                          &data->o_res);
1208         else
1209                 nfs_inode_reclaim_delegation(state->inode,
1210                                              data->owner->so_cred,
1211                                              &data->o_res);
1212 }
1213
1214 /*
1215  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1216  * and update the nfs4_state.
1217  */
1218 static struct nfs4_state *
1219 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1220 {
1221         struct inode *inode = data->state->inode;
1222         struct nfs4_state *state = data->state;
1223         int ret;
1224
1225         if (!data->rpc_done) {
1226                 ret = data->rpc_status;
1227                 goto err;
1228         }
1229
1230         ret = -ESTALE;
1231         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1232             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1233             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1234                 goto err;
1235
1236         ret = -ENOMEM;
1237         state = nfs4_get_open_state(inode, data->owner);
1238         if (state == NULL)
1239                 goto err;
1240
1241         ret = nfs_refresh_inode(inode, &data->f_attr);
1242         if (ret)
1243                 goto err;
1244
1245         if (data->o_res.delegation_type != 0)
1246                 nfs4_opendata_check_deleg(data, state);
1247         update_open_stateid(state, &data->o_res.stateid, NULL,
1248                             data->o_arg.fmode);
1249
1250         return state;
1251 err:
1252         return ERR_PTR(ret);
1253
1254 }
1255
1256 static struct nfs4_state *
1257 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1258 {
1259         struct inode *inode;
1260         struct nfs4_state *state = NULL;
1261         int ret;
1262
1263         if (!data->rpc_done) {
1264                 state = nfs4_try_open_cached(data);
1265                 goto out;
1266         }
1267
1268         ret = -EAGAIN;
1269         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1270                 goto err;
1271         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1272         ret = PTR_ERR(inode);
1273         if (IS_ERR(inode))
1274                 goto err;
1275         ret = -ENOMEM;
1276         state = nfs4_get_open_state(inode, data->owner);
1277         if (state == NULL)
1278                 goto err_put_inode;
1279         if (data->o_res.delegation_type != 0)
1280                 nfs4_opendata_check_deleg(data, state);
1281         update_open_stateid(state, &data->o_res.stateid, NULL,
1282                         data->o_arg.fmode);
1283         iput(inode);
1284 out:
1285         return state;
1286 err_put_inode:
1287         iput(inode);
1288 err:
1289         return ERR_PTR(ret);
1290 }
1291
1292 static struct nfs4_state *
1293 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1294 {
1295         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1296                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1297         return _nfs4_opendata_to_nfs4_state(data);
1298 }
1299
1300 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1301 {
1302         struct nfs_inode *nfsi = NFS_I(state->inode);
1303         struct nfs_open_context *ctx;
1304
1305         spin_lock(&state->inode->i_lock);
1306         list_for_each_entry(ctx, &nfsi->open_files, list) {
1307                 if (ctx->state != state)
1308                         continue;
1309                 get_nfs_open_context(ctx);
1310                 spin_unlock(&state->inode->i_lock);
1311                 return ctx;
1312         }
1313         spin_unlock(&state->inode->i_lock);
1314         return ERR_PTR(-ENOENT);
1315 }
1316
1317 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1318 {
1319         struct nfs4_opendata *opendata;
1320
1321         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1322         if (opendata == NULL)
1323                 return ERR_PTR(-ENOMEM);
1324         opendata->state = state;
1325         atomic_inc(&state->count);
1326         return opendata;
1327 }
1328
1329 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1330 {
1331         struct nfs4_state *newstate;
1332         int ret;
1333
1334         opendata->o_arg.open_flags = 0;
1335         opendata->o_arg.fmode = fmode;
1336         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1337         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1338         nfs4_init_opendata_res(opendata);
1339         ret = _nfs4_recover_proc_open(opendata);
1340         if (ret != 0)
1341                 return ret;
1342         newstate = nfs4_opendata_to_nfs4_state(opendata);
1343         if (IS_ERR(newstate))
1344                 return PTR_ERR(newstate);
1345         nfs4_close_state(newstate, fmode);
1346         *res = newstate;
1347         return 0;
1348 }
1349
1350 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1351 {
1352         struct nfs4_state *newstate;
1353         int ret;
1354
1355         /* memory barrier prior to reading state->n_* */
1356         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1357         smp_rmb();
1358         if (state->n_rdwr != 0) {
1359                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1360                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1361                 if (ret != 0)
1362                         return ret;
1363                 if (newstate != state)
1364                         return -ESTALE;
1365         }
1366         if (state->n_wronly != 0) {
1367                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1368                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1369                 if (ret != 0)
1370                         return ret;
1371                 if (newstate != state)
1372                         return -ESTALE;
1373         }
1374         if (state->n_rdonly != 0) {
1375                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1376                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1377                 if (ret != 0)
1378                         return ret;
1379                 if (newstate != state)
1380                         return -ESTALE;
1381         }
1382         /*
1383          * We may have performed cached opens for all three recoveries.
1384          * Check if we need to update the current stateid.
1385          */
1386         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1387             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1388                 write_seqlock(&state->seqlock);
1389                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1390                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1391                 write_sequnlock(&state->seqlock);
1392         }
1393         return 0;
1394 }
1395
1396 /*
1397  * OPEN_RECLAIM:
1398  *      reclaim state on the server after a reboot.
1399  */
1400 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1401 {
1402         struct nfs_delegation *delegation;
1403         struct nfs4_opendata *opendata;
1404         fmode_t delegation_type = 0;
1405         int status;
1406
1407         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1408         if (IS_ERR(opendata))
1409                 return PTR_ERR(opendata);
1410         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1411         opendata->o_arg.fh = NFS_FH(state->inode);
1412         rcu_read_lock();
1413         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1414         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1415                 delegation_type = delegation->type;
1416         rcu_read_unlock();
1417         opendata->o_arg.u.delegation_type = delegation_type;
1418         status = nfs4_open_recover(opendata, state);
1419         nfs4_opendata_put(opendata);
1420         return status;
1421 }
1422
1423 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1424 {
1425         struct nfs_server *server = NFS_SERVER(state->inode);
1426         struct nfs4_exception exception = { };
1427         int err;
1428         do {
1429                 err = _nfs4_do_open_reclaim(ctx, state);
1430                 if (err != -NFS4ERR_DELAY)
1431                         break;
1432                 nfs4_handle_exception(server, err, &exception);
1433         } while (exception.retry);
1434         return err;
1435 }
1436
1437 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1438 {
1439         struct nfs_open_context *ctx;
1440         int ret;
1441
1442         ctx = nfs4_state_find_open_context(state);
1443         if (IS_ERR(ctx))
1444                 return PTR_ERR(ctx);
1445         ret = nfs4_do_open_reclaim(ctx, state);
1446         put_nfs_open_context(ctx);
1447         return ret;
1448 }
1449
1450 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1451 {
1452         struct nfs4_opendata *opendata;
1453         int ret;
1454
1455         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1456         if (IS_ERR(opendata))
1457                 return PTR_ERR(opendata);
1458         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1459         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1460         ret = nfs4_open_recover(opendata, state);
1461         nfs4_opendata_put(opendata);
1462         return ret;
1463 }
1464
1465 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1466 {
1467         struct nfs4_exception exception = { };
1468         struct nfs_server *server = NFS_SERVER(state->inode);
1469         int err;
1470         do {
1471                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1472                 switch (err) {
1473                         case 0:
1474                         case -ENOENT:
1475                         case -ESTALE:
1476                                 goto out;
1477                         case -NFS4ERR_BADSESSION:
1478                         case -NFS4ERR_BADSLOT:
1479                         case -NFS4ERR_BAD_HIGH_SLOT:
1480                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1481                         case -NFS4ERR_DEADSESSION:
1482                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1483                                 goto out;
1484                         case -NFS4ERR_STALE_CLIENTID:
1485                         case -NFS4ERR_STALE_STATEID:
1486                         case -NFS4ERR_EXPIRED:
1487                                 /* Don't recall a delegation if it was lost */
1488                                 nfs4_schedule_lease_recovery(server->nfs_client);
1489                                 goto out;
1490                         case -ERESTARTSYS:
1491                                 /*
1492                                  * The show must go on: exit, but mark the
1493                                  * stateid as needing recovery.
1494                                  */
1495                         case -NFS4ERR_DELEG_REVOKED:
1496                         case -NFS4ERR_ADMIN_REVOKED:
1497                         case -NFS4ERR_BAD_STATEID:
1498                                 nfs_inode_find_state_and_recover(state->inode,
1499                                                 stateid);
1500                                 nfs4_schedule_stateid_recovery(server, state);
1501                         case -EKEYEXPIRED:
1502                                 /*
1503                                  * User RPCSEC_GSS context has expired.
1504                                  * We cannot recover this stateid now, so
1505                                  * skip it and allow recovery thread to
1506                                  * proceed.
1507                                  */
1508                         case -ENOMEM:
1509                                 err = 0;
1510                                 goto out;
1511                 }
1512                 err = nfs4_handle_exception(server, err, &exception);
1513         } while (exception.retry);
1514 out:
1515         return err;
1516 }
1517
1518 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1519 {
1520         struct nfs4_opendata *data = calldata;
1521
1522         data->rpc_status = task->tk_status;
1523         if (data->rpc_status == 0) {
1524                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1525                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1526                 renew_lease(data->o_res.server, data->timestamp);
1527                 data->rpc_done = 1;
1528         }
1529 }
1530
1531 static void nfs4_open_confirm_release(void *calldata)
1532 {
1533         struct nfs4_opendata *data = calldata;
1534         struct nfs4_state *state = NULL;
1535
1536         /* If this request hasn't been cancelled, do nothing */
1537         if (data->cancelled == 0)
1538                 goto out_free;
1539         /* In case of error, no cleanup! */
1540         if (!data->rpc_done)
1541                 goto out_free;
1542         state = nfs4_opendata_to_nfs4_state(data);
1543         if (!IS_ERR(state))
1544                 nfs4_close_state(state, data->o_arg.fmode);
1545 out_free:
1546         nfs4_opendata_put(data);
1547 }
1548
1549 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1550         .rpc_call_done = nfs4_open_confirm_done,
1551         .rpc_release = nfs4_open_confirm_release,
1552 };
1553
1554 /*
1555  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1556  */
1557 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1558 {
1559         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1560         struct rpc_task *task;
1561         struct  rpc_message msg = {
1562                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1563                 .rpc_argp = &data->c_arg,
1564                 .rpc_resp = &data->c_res,
1565                 .rpc_cred = data->owner->so_cred,
1566         };
1567         struct rpc_task_setup task_setup_data = {
1568                 .rpc_client = server->client,
1569                 .rpc_message = &msg,
1570                 .callback_ops = &nfs4_open_confirm_ops,
1571                 .callback_data = data,
1572                 .workqueue = nfsiod_workqueue,
1573                 .flags = RPC_TASK_ASYNC,
1574         };
1575         int status;
1576
1577         kref_get(&data->kref);
1578         data->rpc_done = 0;
1579         data->rpc_status = 0;
1580         data->timestamp = jiffies;
1581         task = rpc_run_task(&task_setup_data);
1582         if (IS_ERR(task))
1583                 return PTR_ERR(task);
1584         status = nfs4_wait_for_completion_rpc_task(task);
1585         if (status != 0) {
1586                 data->cancelled = 1;
1587                 smp_wmb();
1588         } else
1589                 status = data->rpc_status;
1590         rpc_put_task(task);
1591         return status;
1592 }
1593
1594 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1595 {
1596         struct nfs4_opendata *data = calldata;
1597         struct nfs4_state_owner *sp = data->owner;
1598
1599         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1600                 return;
1601         /*
1602          * Check if we still need to send an OPEN call, or if we can use
1603          * a delegation instead.
1604          */
1605         if (data->state != NULL) {
1606                 struct nfs_delegation *delegation;
1607
1608                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1609                         goto out_no_action;
1610                 rcu_read_lock();
1611                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1612                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1613                     can_open_delegated(delegation, data->o_arg.fmode))
1614                         goto unlock_no_action;
1615                 rcu_read_unlock();
1616         }
1617         /* Update client id. */
1618         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1619         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1620                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1621                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1622                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1623         }
1624         data->timestamp = jiffies;
1625         if (nfs4_setup_sequence(data->o_arg.server,
1626                                 &data->o_arg.seq_args,
1627                                 &data->o_res.seq_res,
1628                                 task) != 0)
1629                 nfs_release_seqid(data->o_arg.seqid);
1630         else
1631                 rpc_call_start(task);
1632         return;
1633 unlock_no_action:
1634         rcu_read_unlock();
1635 out_no_action:
1636         task->tk_action = NULL;
1637
1638 }
1639
1640 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1641 {
1642         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1643         nfs4_open_prepare(task, calldata);
1644 }
1645
1646 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1647 {
1648         struct nfs4_opendata *data = calldata;
1649
1650         data->rpc_status = task->tk_status;
1651
1652         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1653                 return;
1654
1655         if (task->tk_status == 0) {
1656                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1657                         switch (data->o_res.f_attr->mode & S_IFMT) {
1658                         case S_IFREG:
1659                                 break;
1660                         case S_IFLNK:
1661                                 data->rpc_status = -ELOOP;
1662                                 break;
1663                         case S_IFDIR:
1664                                 data->rpc_status = -EISDIR;
1665                                 break;
1666                         default:
1667                                 data->rpc_status = -ENOTDIR;
1668                         }
1669                 }
1670                 renew_lease(data->o_res.server, data->timestamp);
1671                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1672                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1673         }
1674         data->rpc_done = 1;
1675 }
1676
1677 static void nfs4_open_release(void *calldata)
1678 {
1679         struct nfs4_opendata *data = calldata;
1680         struct nfs4_state *state = NULL;
1681
1682         /* If this request hasn't been cancelled, do nothing */
1683         if (data->cancelled == 0)
1684                 goto out_free;
1685         /* In case of error, no cleanup! */
1686         if (data->rpc_status != 0 || !data->rpc_done)
1687                 goto out_free;
1688         /* In case we need an open_confirm, no cleanup! */
1689         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1690                 goto out_free;
1691         state = nfs4_opendata_to_nfs4_state(data);
1692         if (!IS_ERR(state))
1693                 nfs4_close_state(state, data->o_arg.fmode);
1694 out_free:
1695         nfs4_opendata_put(data);
1696 }
1697
1698 static const struct rpc_call_ops nfs4_open_ops = {
1699         .rpc_call_prepare = nfs4_open_prepare,
1700         .rpc_call_done = nfs4_open_done,
1701         .rpc_release = nfs4_open_release,
1702 };
1703
1704 static const struct rpc_call_ops nfs4_recover_open_ops = {
1705         .rpc_call_prepare = nfs4_recover_open_prepare,
1706         .rpc_call_done = nfs4_open_done,
1707         .rpc_release = nfs4_open_release,
1708 };
1709
1710 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1711 {
1712         struct inode *dir = data->dir->d_inode;
1713         struct nfs_server *server = NFS_SERVER(dir);
1714         struct nfs_openargs *o_arg = &data->o_arg;
1715         struct nfs_openres *o_res = &data->o_res;
1716         struct rpc_task *task;
1717         struct rpc_message msg = {
1718                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1719                 .rpc_argp = o_arg,
1720                 .rpc_resp = o_res,
1721                 .rpc_cred = data->owner->so_cred,
1722         };
1723         struct rpc_task_setup task_setup_data = {
1724                 .rpc_client = server->client,
1725                 .rpc_message = &msg,
1726                 .callback_ops = &nfs4_open_ops,
1727                 .callback_data = data,
1728                 .workqueue = nfsiod_workqueue,
1729                 .flags = RPC_TASK_ASYNC,
1730         };
1731         int status;
1732
1733         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1734         kref_get(&data->kref);
1735         data->rpc_done = 0;
1736         data->rpc_status = 0;
1737         data->cancelled = 0;
1738         if (isrecover)
1739                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1740         task = rpc_run_task(&task_setup_data);
1741         if (IS_ERR(task))
1742                 return PTR_ERR(task);
1743         status = nfs4_wait_for_completion_rpc_task(task);
1744         if (status != 0) {
1745                 data->cancelled = 1;
1746                 smp_wmb();
1747         } else
1748                 status = data->rpc_status;
1749         rpc_put_task(task);
1750
1751         return status;
1752 }
1753
1754 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1755 {
1756         struct inode *dir = data->dir->d_inode;
1757         struct nfs_openres *o_res = &data->o_res;
1758         int status;
1759
1760         status = nfs4_run_open_task(data, 1);
1761         if (status != 0 || !data->rpc_done)
1762                 return status;
1763
1764         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1765
1766         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1767                 status = _nfs4_proc_open_confirm(data);
1768                 if (status != 0)
1769                         return status;
1770         }
1771
1772         return status;
1773 }
1774
1775 static int nfs4_opendata_access(struct rpc_cred *cred,
1776                                 struct nfs4_opendata *opendata,
1777                                 struct nfs4_state *state, fmode_t fmode)
1778 {
1779         struct nfs_access_entry cache;
1780         u32 mask;
1781
1782         /* access call failed or for some reason the server doesn't
1783          * support any access modes -- defer access call until later */
1784         if (opendata->o_res.access_supported == 0)
1785                 return 0;
1786
1787         mask = 0;
1788         /* don't check MAY_WRITE - a newly created file may not have
1789          * write mode bits, but POSIX allows the creating process to write */
1790         if (fmode & FMODE_READ)
1791                 mask |= MAY_READ;
1792         if (fmode & FMODE_EXEC)
1793                 mask |= MAY_EXEC;
1794
1795         cache.cred = cred;
1796         cache.jiffies = jiffies;
1797         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1798         nfs_access_add_cache(state->inode, &cache);
1799
1800         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1801                 return 0;
1802
1803         /* even though OPEN succeeded, access is denied. Close the file */
1804         nfs4_close_state(state, fmode);
1805         return -EACCES;
1806 }
1807
1808 /*
1809  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1810  */
1811 static int _nfs4_proc_open(struct nfs4_opendata *data)
1812 {
1813         struct inode *dir = data->dir->d_inode;
1814         struct nfs_server *server = NFS_SERVER(dir);
1815         struct nfs_openargs *o_arg = &data->o_arg;
1816         struct nfs_openres *o_res = &data->o_res;
1817         int status;
1818
1819         status = nfs4_run_open_task(data, 0);
1820         if (!data->rpc_done)
1821                 return status;
1822         if (status != 0) {
1823                 if (status == -NFS4ERR_BADNAME &&
1824                                 !(o_arg->open_flags & O_CREAT))
1825                         return -ENOENT;
1826                 return status;
1827         }
1828
1829         nfs_fattr_map_and_free_names(server, &data->f_attr);
1830
1831         if (o_arg->open_flags & O_CREAT)
1832                 update_changeattr(dir, &o_res->cinfo);
1833         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1834                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1835         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1836                 status = _nfs4_proc_open_confirm(data);
1837                 if (status != 0)
1838                         return status;
1839         }
1840         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1841                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1842         return 0;
1843 }
1844
1845 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1846 {
1847         unsigned int loop;
1848         int ret;
1849
1850         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1851                 ret = nfs4_wait_clnt_recover(clp);
1852                 if (ret != 0)
1853                         break;
1854                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1855                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1856                         break;
1857                 nfs4_schedule_state_manager(clp);
1858                 ret = -EIO;
1859         }
1860         return ret;
1861 }
1862
1863 static int nfs4_recover_expired_lease(struct nfs_server *server)
1864 {
1865         return nfs4_client_recover_expired_lease(server->nfs_client);
1866 }
1867
1868 /*
1869  * OPEN_EXPIRED:
1870  *      reclaim state on the server after a network partition.
1871  *      Assumes caller holds the appropriate lock
1872  */
1873 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1874 {
1875         struct nfs4_opendata *opendata;
1876         int ret;
1877
1878         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1879         if (IS_ERR(opendata))
1880                 return PTR_ERR(opendata);
1881         ret = nfs4_open_recover(opendata, state);
1882         if (ret == -ESTALE)
1883                 d_drop(ctx->dentry);
1884         nfs4_opendata_put(opendata);
1885         return ret;
1886 }
1887
1888 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1889 {
1890         struct nfs_server *server = NFS_SERVER(state->inode);
1891         struct nfs4_exception exception = { };
1892         int err;
1893
1894         do {
1895                 err = _nfs4_open_expired(ctx, state);
1896                 switch (err) {
1897                 default:
1898                         goto out;
1899                 case -NFS4ERR_GRACE:
1900                 case -NFS4ERR_DELAY:
1901                         nfs4_handle_exception(server, err, &exception);
1902                         err = 0;
1903                 }
1904         } while (exception.retry);
1905 out:
1906         return err;
1907 }
1908
1909 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1910 {
1911         struct nfs_open_context *ctx;
1912         int ret;
1913
1914         ctx = nfs4_state_find_open_context(state);
1915         if (IS_ERR(ctx))
1916                 return PTR_ERR(ctx);
1917         ret = nfs4_do_open_expired(ctx, state);
1918         put_nfs_open_context(ctx);
1919         return ret;
1920 }
1921
1922 #if defined(CONFIG_NFS_V4_1)
1923 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1924 {
1925         struct nfs_server *server = NFS_SERVER(state->inode);
1926         nfs4_stateid *stateid = &state->stateid;
1927         int status;
1928
1929         /* If a state reset has been done, test_stateid is unneeded */
1930         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1931                 return;
1932
1933         status = nfs41_test_stateid(server, stateid);
1934         if (status != NFS_OK) {
1935                 /* Free the stateid unless the server explicitly
1936                  * informs us the stateid is unrecognized. */
1937                 if (status != -NFS4ERR_BAD_STATEID)
1938                         nfs41_free_stateid(server, stateid);
1939                 nfs_remove_bad_delegation(state->inode);
1940
1941                 write_seqlock(&state->seqlock);
1942                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1943                 write_sequnlock(&state->seqlock);
1944                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1945         }
1946 }
1947
1948 /**
1949  * nfs41_check_open_stateid - possibly free an open stateid
1950  *
1951  * @state: NFSv4 state for an inode
1952  *
1953  * Returns NFS_OK if recovery for this stateid is now finished.
1954  * Otherwise a negative NFS4ERR value is returned.
1955  */
1956 static int nfs41_check_open_stateid(struct nfs4_state *state)
1957 {
1958         struct nfs_server *server = NFS_SERVER(state->inode);
1959         nfs4_stateid *stateid = &state->open_stateid;
1960         int status;
1961
1962         /* If a state reset has been done, test_stateid is unneeded */
1963         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1964             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1965             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1966                 return -NFS4ERR_BAD_STATEID;
1967
1968         status = nfs41_test_stateid(server, stateid);
1969         if (status != NFS_OK) {
1970                 /* Free the stateid unless the server explicitly
1971                  * informs us the stateid is unrecognized. */
1972                 if (status != -NFS4ERR_BAD_STATEID)
1973                         nfs41_free_stateid(server, stateid);
1974
1975                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1976                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1977                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1978         }
1979         return status;
1980 }
1981
1982 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1983 {
1984         int status;
1985
1986         nfs41_clear_delegation_stateid(state);
1987         status = nfs41_check_open_stateid(state);
1988         if (status != NFS_OK)
1989                 status = nfs4_open_expired(sp, state);
1990         return status;
1991 }
1992 #endif
1993
1994 /*
1995  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1996  * fields corresponding to attributes that were used to store the verifier.
1997  * Make sure we clobber those fields in the later setattr call
1998  */
1999 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2000 {
2001         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2002             !(sattr->ia_valid & ATTR_ATIME_SET))
2003                 sattr->ia_valid |= ATTR_ATIME;
2004
2005         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2006             !(sattr->ia_valid & ATTR_MTIME_SET))
2007                 sattr->ia_valid |= ATTR_MTIME;
2008 }
2009
2010 /*
2011  * Returns a referenced nfs4_state
2012  */
2013 static int _nfs4_do_open(struct inode *dir,
2014                         struct dentry *dentry,
2015                         fmode_t fmode,
2016                         int flags,
2017                         struct iattr *sattr,
2018                         struct rpc_cred *cred,
2019                         struct nfs4_state **res,
2020                         struct nfs4_threshold **ctx_th)
2021 {
2022         struct nfs4_state_owner  *sp;
2023         struct nfs4_state     *state = NULL;
2024         struct nfs_server       *server = NFS_SERVER(dir);
2025         struct nfs4_opendata *opendata;
2026         int status;
2027
2028         /* Protect against reboot recovery conflicts */
2029         status = -ENOMEM;
2030         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2031         if (sp == NULL) {
2032                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2033                 goto out_err;
2034         }
2035         status = nfs4_recover_expired_lease(server);
2036         if (status != 0)
2037                 goto err_put_state_owner;
2038         if (dentry->d_inode != NULL)
2039                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2040         status = -ENOMEM;
2041         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
2042         if (opendata == NULL)
2043                 goto err_put_state_owner;
2044
2045         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2046                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2047                 if (!opendata->f_attr.mdsthreshold)
2048                         goto err_opendata_put;
2049                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2050         }
2051         if (dentry->d_inode != NULL)
2052                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2053
2054         status = _nfs4_proc_open(opendata);
2055         if (status != 0)
2056                 goto err_opendata_put;
2057
2058         state = nfs4_opendata_to_nfs4_state(opendata);
2059         status = PTR_ERR(state);
2060         if (IS_ERR(state))
2061                 goto err_opendata_put;
2062         if (server->caps & NFS_CAP_POSIX_LOCK)
2063                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2064
2065         status = nfs4_opendata_access(cred, opendata, state, fmode);
2066         if (status != 0)
2067                 goto err_opendata_put;
2068
2069         if (opendata->o_arg.open_flags & O_EXCL) {
2070                 nfs4_exclusive_attrset(opendata, sattr);
2071
2072                 nfs_fattr_init(opendata->o_res.f_attr);
2073                 status = nfs4_do_setattr(state->inode, cred,
2074                                 opendata->o_res.f_attr, sattr,
2075                                 state);
2076                 if (status == 0)
2077                         nfs_setattr_update_inode(state->inode, sattr);
2078                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2079         }
2080
2081         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2082                 *ctx_th = opendata->f_attr.mdsthreshold;
2083         else
2084                 kfree(opendata->f_attr.mdsthreshold);
2085         opendata->f_attr.mdsthreshold = NULL;
2086
2087         nfs4_opendata_put(opendata);
2088         nfs4_put_state_owner(sp);
2089         *res = state;
2090         return 0;
2091 err_opendata_put:
2092         kfree(opendata->f_attr.mdsthreshold);
2093         nfs4_opendata_put(opendata);
2094 err_put_state_owner:
2095         nfs4_put_state_owner(sp);
2096 out_err:
2097         *res = NULL;
2098         return status;
2099 }
2100
2101
2102 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2103                                         struct dentry *dentry,
2104                                         fmode_t fmode,
2105                                         int flags,
2106                                         struct iattr *sattr,
2107                                         struct rpc_cred *cred,
2108                                         struct nfs4_threshold **ctx_th)
2109 {
2110         struct nfs4_exception exception = { };
2111         struct nfs4_state *res;
2112         int status;
2113
2114         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
2115         do {
2116                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
2117                                        &res, ctx_th);
2118                 if (status == 0)
2119                         break;
2120                 /* NOTE: BAD_SEQID means the server and client disagree about the
2121                  * book-keeping w.r.t. state-changing operations
2122                  * (OPEN/CLOSE/LOCK/LOCKU...)
2123                  * It is actually a sign of a bug on the client or on the server.
2124                  *
2125                  * If we receive a BAD_SEQID error in the particular case of
2126                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2127                  * have unhashed the old state_owner for us, and that we can
2128                  * therefore safely retry using a new one. We should still warn
2129                  * the user though...
2130                  */
2131                 if (status == -NFS4ERR_BAD_SEQID) {
2132                         pr_warn_ratelimited("NFS: v4 server %s "
2133                                         " returned a bad sequence-id error!\n",
2134                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2135                         exception.retry = 1;
2136                         continue;
2137                 }
2138                 /*
2139                  * BAD_STATEID on OPEN means that the server cancelled our
2140                  * state before it received the OPEN_CONFIRM.
2141                  * Recover by retrying the request as per the discussion
2142                  * on Page 181 of RFC3530.
2143                  */
2144                 if (status == -NFS4ERR_BAD_STATEID) {
2145                         exception.retry = 1;
2146                         continue;
2147                 }
2148                 if (status == -EAGAIN) {
2149                         /* We must have found a delegation */
2150                         exception.retry = 1;
2151                         continue;
2152                 }
2153                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
2154                                         status, &exception));
2155         } while (exception.retry);
2156         return res;
2157 }
2158
2159 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2160                             struct nfs_fattr *fattr, struct iattr *sattr,
2161                             struct nfs4_state *state)
2162 {
2163         struct nfs_server *server = NFS_SERVER(inode);
2164         struct nfs_setattrargs  arg = {
2165                 .fh             = NFS_FH(inode),
2166                 .iap            = sattr,
2167                 .server         = server,
2168                 .bitmask = server->attr_bitmask,
2169         };
2170         struct nfs_setattrres  res = {
2171                 .fattr          = fattr,
2172                 .server         = server,
2173         };
2174         struct rpc_message msg = {
2175                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2176                 .rpc_argp       = &arg,
2177                 .rpc_resp       = &res,
2178                 .rpc_cred       = cred,
2179         };
2180         unsigned long timestamp = jiffies;
2181         int status;
2182
2183         nfs_fattr_init(fattr);
2184
2185         if (state != NULL) {
2186                 struct nfs_lockowner lockowner = {
2187                         .l_owner = current->files,
2188                         .l_pid = current->tgid,
2189                 };
2190                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2191                                 &lockowner);
2192         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2193                                 FMODE_WRITE)) {
2194                 /* Use that stateid */
2195         } else
2196                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2197
2198         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2199         if (status == 0 && state != NULL)
2200                 renew_lease(server, timestamp);
2201         return status;
2202 }
2203
2204 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2205                            struct nfs_fattr *fattr, struct iattr *sattr,
2206                            struct nfs4_state *state)
2207 {
2208         struct nfs_server *server = NFS_SERVER(inode);
2209         struct nfs4_exception exception = {
2210                 .state = state,
2211                 .inode = inode,
2212         };
2213         int err;
2214         do {
2215                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2216                 switch (err) {
2217                 case -NFS4ERR_OPENMODE:
2218                         if (state && !(state->state & FMODE_WRITE)) {
2219                                 err = -EBADF;
2220                                 if (sattr->ia_valid & ATTR_OPEN)
2221                                         err = -EACCES;
2222                                 goto out;
2223                         }
2224                 }
2225                 err = nfs4_handle_exception(server, err, &exception);
2226         } while (exception.retry);
2227 out:
2228         return err;
2229 }
2230
2231 struct nfs4_closedata {
2232         struct inode *inode;
2233         struct nfs4_state *state;
2234         struct nfs_closeargs arg;
2235         struct nfs_closeres res;
2236         struct nfs_fattr fattr;
2237         unsigned long timestamp;
2238         bool roc;
2239         u32 roc_barrier;
2240 };
2241
2242 static void nfs4_free_closedata(void *data)
2243 {
2244         struct nfs4_closedata *calldata = data;
2245         struct nfs4_state_owner *sp = calldata->state->owner;
2246         struct super_block *sb = calldata->state->inode->i_sb;
2247
2248         if (calldata->roc)
2249                 pnfs_roc_release(calldata->state->inode);
2250         nfs4_put_open_state(calldata->state);
2251         nfs_free_seqid(calldata->arg.seqid);
2252         nfs4_put_state_owner(sp);
2253         nfs_sb_deactive_async(sb);
2254         kfree(calldata);
2255 }
2256
2257 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2258                 fmode_t fmode)
2259 {
2260         spin_lock(&state->owner->so_lock);
2261         if (!(fmode & FMODE_READ))
2262                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2263         if (!(fmode & FMODE_WRITE))
2264                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2265         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2266         spin_unlock(&state->owner->so_lock);
2267 }
2268
2269 static void nfs4_close_done(struct rpc_task *task, void *data)
2270 {
2271         struct nfs4_closedata *calldata = data;
2272         struct nfs4_state *state = calldata->state;
2273         struct nfs_server *server = NFS_SERVER(calldata->inode);
2274
2275         dprintk("%s: begin!\n", __func__);
2276         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2277                 return;
2278         /* hmm. we are done with the inode, and in the process of freeing
2279          * the state_owner. we keep this around to process errors
2280          */
2281         switch (task->tk_status) {
2282                 case 0:
2283                         if (calldata->roc)
2284                                 pnfs_roc_set_barrier(state->inode,
2285                                                      calldata->roc_barrier);
2286                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2287                         renew_lease(server, calldata->timestamp);
2288                         nfs4_close_clear_stateid_flags(state,
2289                                         calldata->arg.fmode);
2290                         break;
2291                 case -NFS4ERR_STALE_STATEID:
2292                 case -NFS4ERR_OLD_STATEID:
2293                 case -NFS4ERR_BAD_STATEID:
2294                 case -NFS4ERR_EXPIRED:
2295                         if (calldata->arg.fmode == 0)
2296                                 break;
2297                 default:
2298                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2299                                 rpc_restart_call_prepare(task);
2300         }
2301         nfs_release_seqid(calldata->arg.seqid);
2302         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2303         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2304 }
2305
2306 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2307 {
2308         struct nfs4_closedata *calldata = data;
2309         struct nfs4_state *state = calldata->state;
2310         struct inode *inode = calldata->inode;
2311         int call_close = 0;
2312
2313         dprintk("%s: begin!\n", __func__);
2314         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2315                 return;
2316
2317         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2318         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2319         spin_lock(&state->owner->so_lock);
2320         /* Calculate the change in open mode */
2321         if (state->n_rdwr == 0) {
2322                 if (state->n_rdonly == 0) {
2323                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2324                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2325                         calldata->arg.fmode &= ~FMODE_READ;
2326                 }
2327                 if (state->n_wronly == 0) {
2328                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2329                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2330                         calldata->arg.fmode &= ~FMODE_WRITE;
2331                 }
2332         }
2333         spin_unlock(&state->owner->so_lock);
2334
2335         if (!call_close) {
2336                 /* Note: exit _without_ calling nfs4_close_done */
2337                 task->tk_action = NULL;
2338                 goto out;
2339         }
2340
2341         if (calldata->arg.fmode == 0) {
2342                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2343                 if (calldata->roc &&
2344                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2345                         goto out;
2346         }
2347
2348         nfs_fattr_init(calldata->res.fattr);
2349         calldata->timestamp = jiffies;
2350         if (nfs4_setup_sequence(NFS_SERVER(inode),
2351                                 &calldata->arg.seq_args,
2352                                 &calldata->res.seq_res,
2353                                 task) != 0)
2354                 nfs_release_seqid(calldata->arg.seqid);
2355         else
2356                 rpc_call_start(task);
2357 out:
2358         dprintk("%s: done!\n", __func__);
2359 }
2360
2361 static const struct rpc_call_ops nfs4_close_ops = {
2362         .rpc_call_prepare = nfs4_close_prepare,
2363         .rpc_call_done = nfs4_close_done,
2364         .rpc_release = nfs4_free_closedata,
2365 };
2366
2367 /*
2368  * It is possible for data to be read/written from a mem-mapped file
2369  * after the sys_close call (which hits the vfs layer as a flush).
2370  * This means that we can't safely call nfsv4 close on a file until
2371  * the inode is cleared. This in turn means that we are not good
2372  * NFSv4 citizens - we do not indicate to the server to update the file's
2373  * share state even when we are done with one of the three share
2374  * stateid's in the inode.
2375  *
2376  * NOTE: Caller must be holding the sp->so_owner semaphore!
2377  */
2378 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2379 {
2380         struct nfs_server *server = NFS_SERVER(state->inode);
2381         struct nfs4_closedata *calldata;
2382         struct nfs4_state_owner *sp = state->owner;
2383         struct rpc_task *task;
2384         struct rpc_message msg = {
2385                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2386                 .rpc_cred = state->owner->so_cred,
2387         };
2388         struct rpc_task_setup task_setup_data = {
2389                 .rpc_client = server->client,
2390                 .rpc_message = &msg,
2391                 .callback_ops = &nfs4_close_ops,
2392                 .workqueue = nfsiod_workqueue,
2393                 .flags = RPC_TASK_ASYNC,
2394         };
2395         int status = -ENOMEM;
2396
2397         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2398         if (calldata == NULL)
2399                 goto out;
2400         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2401         calldata->inode = state->inode;
2402         calldata->state = state;
2403         calldata->arg.fh = NFS_FH(state->inode);
2404         calldata->arg.stateid = &state->open_stateid;
2405         /* Serialization for the sequence id */
2406         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2407         if (calldata->arg.seqid == NULL)
2408                 goto out_free_calldata;
2409         calldata->arg.fmode = 0;
2410         calldata->arg.bitmask = server->cache_consistency_bitmask;
2411         calldata->res.fattr = &calldata->fattr;
2412         calldata->res.seqid = calldata->arg.seqid;
2413         calldata->res.server = server;
2414         calldata->roc = pnfs_roc(state->inode);
2415         nfs_sb_active(calldata->inode->i_sb);
2416
2417         msg.rpc_argp = &calldata->arg;
2418         msg.rpc_resp = &calldata->res;
2419         task_setup_data.callback_data = calldata;
2420         task = rpc_run_task(&task_setup_data);
2421         if (IS_ERR(task))
2422                 return PTR_ERR(task);
2423         status = 0;
2424         if (wait)
2425                 status = rpc_wait_for_completion_task(task);
2426         rpc_put_task(task);
2427         return status;
2428 out_free_calldata:
2429         kfree(calldata);
2430 out:
2431         nfs4_put_open_state(state);
2432         nfs4_put_state_owner(sp);
2433         return status;
2434 }
2435
2436 static struct inode *
2437 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2438 {
2439         struct nfs4_state *state;
2440
2441         /* Protect against concurrent sillydeletes */
2442         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2443                              ctx->cred, &ctx->mdsthreshold);
2444         if (IS_ERR(state))
2445                 return ERR_CAST(state);
2446         ctx->state = state;
2447         return igrab(state->inode);
2448 }
2449
2450 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2451 {
2452         if (ctx->state == NULL)
2453                 return;
2454         if (is_sync)
2455                 nfs4_close_sync(ctx->state, ctx->mode);
2456         else
2457                 nfs4_close_state(ctx->state, ctx->mode);
2458 }
2459
2460 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2461 {
2462         struct nfs4_server_caps_arg args = {
2463                 .fhandle = fhandle,
2464         };
2465         struct nfs4_server_caps_res res = {};
2466         struct rpc_message msg = {
2467                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2468                 .rpc_argp = &args,
2469                 .rpc_resp = &res,
2470         };
2471         int status;
2472
2473         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2474         if (status == 0) {
2475                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2476                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2477                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2478                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2479                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2480                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2481                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2482                         server->caps |= NFS_CAP_ACLS;
2483                 if (res.has_links != 0)
2484                         server->caps |= NFS_CAP_HARDLINKS;
2485                 if (res.has_symlinks != 0)
2486                         server->caps |= NFS_CAP_SYMLINKS;
2487                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2488                         server->caps |= NFS_CAP_FILEID;
2489                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2490                         server->caps |= NFS_CAP_MODE;
2491                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2492                         server->caps |= NFS_CAP_NLINK;
2493                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2494                         server->caps |= NFS_CAP_OWNER;
2495                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2496                         server->caps |= NFS_CAP_OWNER_GROUP;
2497                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2498                         server->caps |= NFS_CAP_ATIME;
2499                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2500                         server->caps |= NFS_CAP_CTIME;
2501                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2502                         server->caps |= NFS_CAP_MTIME;
2503
2504                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2505                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2506                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2507                 server->acl_bitmask = res.acl_bitmask;
2508                 server->fh_expire_type = res.fh_expire_type;
2509         }
2510
2511         return status;
2512 }
2513
2514 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2515 {
2516         struct nfs4_exception exception = { };
2517         int err;
2518         do {
2519                 err = nfs4_handle_exception(server,
2520                                 _nfs4_server_capabilities(server, fhandle),
2521                                 &exception);
2522         } while (exception.retry);
2523         return err;
2524 }
2525
2526 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2527                 struct nfs_fsinfo *info)
2528 {
2529         struct nfs4_lookup_root_arg args = {
2530                 .bitmask = nfs4_fattr_bitmap,
2531         };
2532         struct nfs4_lookup_res res = {
2533                 .server = server,
2534                 .fattr = info->fattr,
2535                 .fh = fhandle,
2536         };
2537         struct rpc_message msg = {
2538                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2539                 .rpc_argp = &args,
2540                 .rpc_resp = &res,
2541         };
2542
2543         nfs_fattr_init(info->fattr);
2544         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2545 }
2546
2547 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2548                 struct nfs_fsinfo *info)
2549 {
2550         struct nfs4_exception exception = { };
2551         int err;
2552         do {
2553                 err = _nfs4_lookup_root(server, fhandle, info);
2554                 switch (err) {
2555                 case 0:
2556                 case -NFS4ERR_WRONGSEC:
2557                         goto out;
2558                 default:
2559                         err = nfs4_handle_exception(server, err, &exception);
2560                 }
2561         } while (exception.retry);
2562 out:
2563         return err;
2564 }
2565
2566 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2567                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2568 {
2569         struct rpc_auth *auth;
2570         int ret;
2571
2572         auth = rpcauth_create(flavor, server->client);
2573         if (IS_ERR(auth)) {
2574                 ret = -EIO;
2575                 goto out;
2576         }
2577         ret = nfs4_lookup_root(server, fhandle, info);
2578 out:
2579         return ret;
2580 }
2581
2582 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2583                               struct nfs_fsinfo *info)
2584 {
2585         int i, len, status = 0;
2586         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2587
2588         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2589         if (len < 0)
2590                 return len;
2591
2592         for (i = 0; i < len; i++) {
2593                 /* AUTH_UNIX is the default flavor if none was specified,
2594                  * thus has already been tried. */
2595                 if (flav_array[i] == RPC_AUTH_UNIX)
2596                         continue;
2597
2598                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2599                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2600                         continue;
2601                 break;
2602         }
2603         /*
2604          * -EACCESS could mean that the user doesn't have correct permissions
2605          * to access the mount.  It could also mean that we tried to mount
2606          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2607          * existing mount programs don't handle -EACCES very well so it should
2608          * be mapped to -EPERM instead.
2609          */
2610         if (status == -EACCES)
2611                 status = -EPERM;
2612         return status;
2613 }
2614
2615 /*
2616  * get the file handle for the "/" directory on the server
2617  */
2618 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2619                          struct nfs_fsinfo *info)
2620 {
2621         int minor_version = server->nfs_client->cl_minorversion;
2622         int status = nfs4_lookup_root(server, fhandle, info);
2623         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2624                 /*
2625                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2626                  * by nfs4_map_errors() as this function exits.
2627                  */
2628                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2629         if (status == 0)
2630                 status = nfs4_server_capabilities(server, fhandle);
2631         if (status == 0)
2632                 status = nfs4_do_fsinfo(server, fhandle, info);
2633         return nfs4_map_errors(status);
2634 }
2635
2636 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2637                               struct nfs_fsinfo *info)
2638 {
2639         int error;
2640         struct nfs_fattr *fattr = info->fattr;
2641
2642         error = nfs4_server_capabilities(server, mntfh);
2643         if (error < 0) {
2644                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2645                 return error;
2646         }
2647
2648         error = nfs4_proc_getattr(server, mntfh, fattr);
2649         if (error < 0) {
2650                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2651                 return error;
2652         }
2653
2654         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2655             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2656                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2657
2658         return error;
2659 }
2660
2661 /*
2662  * Get locations and (maybe) other attributes of a referral.
2663  * Note that we'll actually follow the referral later when
2664  * we detect fsid mismatch in inode revalidation
2665  */
2666 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2667                              const struct qstr *name, struct nfs_fattr *fattr,
2668                              struct nfs_fh *fhandle)
2669 {
2670         int status = -ENOMEM;
2671         struct page *page = NULL;
2672         struct nfs4_fs_locations *locations = NULL;
2673
2674         page = alloc_page(GFP_KERNEL);
2675         if (page == NULL)
2676                 goto out;
2677         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2678         if (locations == NULL)
2679                 goto out;
2680
2681         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2682         if (status != 0)
2683                 goto out;
2684         /* Make sure server returned a different fsid for the referral */
2685         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2686                 dprintk("%s: server did not return a different fsid for"
2687                         " a referral at %s\n", __func__, name->name);
2688                 status = -EIO;
2689                 goto out;
2690         }
2691         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2692         nfs_fixup_referral_attributes(&locations->fattr);
2693
2694         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2695         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2696         memset(fhandle, 0, sizeof(struct nfs_fh));
2697 out:
2698         if (page)
2699                 __free_page(page);
2700         kfree(locations);
2701         return status;
2702 }
2703
2704 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2705 {
2706         struct nfs4_getattr_arg args = {
2707                 .fh = fhandle,
2708                 .bitmask = server->attr_bitmask,
2709         };
2710         struct nfs4_getattr_res res = {
2711                 .fattr = fattr,
2712                 .server = server,
2713         };
2714         struct rpc_message msg = {
2715                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2716                 .rpc_argp = &args,
2717                 .rpc_resp = &res,
2718         };
2719
2720         nfs_fattr_init(fattr);
2721         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2722 }
2723
2724 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2725 {
2726         struct nfs4_exception exception = { };
2727         int err;
2728         do {
2729                 err = nfs4_handle_exception(server,
2730                                 _nfs4_proc_getattr(server, fhandle, fattr),
2731                                 &exception);
2732         } while (exception.retry);
2733         return err;
2734 }
2735
2736 /*
2737  * The file is not closed if it is opened due to the a request to change
2738  * the size of the file. The open call will not be needed once the
2739  * VFS layer lookup-intents are implemented.
2740  *
2741  * Close is called when the inode is destroyed.
2742  * If we haven't opened the file for O_WRONLY, we
2743  * need to in the size_change case to obtain a stateid.
2744  *
2745  * Got race?
2746  * Because OPEN is always done by name in nfsv4, it is
2747  * possible that we opened a different file by the same
2748  * name.  We can recognize this race condition, but we
2749  * can't do anything about it besides returning an error.
2750  *
2751  * This will be fixed with VFS changes (lookup-intent).
2752  */
2753 static int
2754 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2755                   struct iattr *sattr)
2756 {
2757         struct inode *inode = dentry->d_inode;
2758         struct rpc_cred *cred = NULL;
2759         struct nfs4_state *state = NULL;
2760         int status;
2761
2762         if (pnfs_ld_layoutret_on_setattr(inode))
2763                 pnfs_return_layout(inode);
2764
2765         nfs_fattr_init(fattr);
2766
2767         /* Deal with open(O_TRUNC) */
2768         if (sattr->ia_valid & ATTR_OPEN)
2769                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2770
2771         /* Optimization: if the end result is no change, don't RPC */
2772         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2773                 return 0;
2774
2775         /* Search for an existing open(O_WRITE) file */
2776         if (sattr->ia_valid & ATTR_FILE) {
2777                 struct nfs_open_context *ctx;
2778
2779                 ctx = nfs_file_open_context(sattr->ia_file);
2780                 if (ctx) {
2781                         cred = ctx->cred;
2782                         state = ctx->state;
2783                 }
2784         }
2785
2786         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2787         if (status == 0)
2788                 nfs_setattr_update_inode(inode, sattr);
2789         return status;
2790 }
2791
2792 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2793                 const struct qstr *name, struct nfs_fh *fhandle,
2794                 struct nfs_fattr *fattr)
2795 {
2796         struct nfs_server *server = NFS_SERVER(dir);
2797         int                    status;
2798         struct nfs4_lookup_arg args = {
2799                 .bitmask = server->attr_bitmask,
2800                 .dir_fh = NFS_FH(dir),
2801                 .name = name,
2802         };
2803         struct nfs4_lookup_res res = {
2804                 .server = server,
2805                 .fattr = fattr,
2806                 .fh = fhandle,
2807         };
2808         struct rpc_message msg = {
2809                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2810                 .rpc_argp = &args,
2811                 .rpc_resp = &res,
2812         };
2813
2814         nfs_fattr_init(fattr);
2815
2816         dprintk("NFS call  lookup %s\n", name->name);
2817         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2818         dprintk("NFS reply lookup: %d\n", status);
2819         return status;
2820 }
2821
2822 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2823 {
2824         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2825                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2826         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2827         fattr->nlink = 2;
2828 }
2829
2830 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2831                                    struct qstr *name, struct nfs_fh *fhandle,
2832                                    struct nfs_fattr *fattr)
2833 {
2834         struct nfs4_exception exception = { };
2835         struct rpc_clnt *client = *clnt;
2836         int err;
2837         do {
2838                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2839                 switch (err) {
2840                 case -NFS4ERR_BADNAME:
2841                         err = -ENOENT;
2842                         goto out;
2843                 case -NFS4ERR_MOVED:
2844                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2845                         goto out;
2846                 case -NFS4ERR_WRONGSEC:
2847                         err = -EPERM;
2848                         if (client != *clnt)
2849                                 goto out;
2850
2851                         client = nfs4_create_sec_client(client, dir, name);
2852                         if (IS_ERR(client))
2853                                 return PTR_ERR(client);
2854
2855                         exception.retry = 1;
2856                         break;
2857                 default:
2858                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2859                 }
2860         } while (exception.retry);
2861
2862 out:
2863         if (err == 0)
2864                 *clnt = client;
2865         else if (client != *clnt)
2866                 rpc_shutdown_client(client);
2867
2868         return err;
2869 }
2870
2871 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2872                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2873 {
2874         int status;
2875         struct rpc_clnt *client = NFS_CLIENT(dir);
2876
2877         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2878         if (client != NFS_CLIENT(dir)) {
2879                 rpc_shutdown_client(client);
2880                 nfs_fixup_secinfo_attributes(fattr);
2881         }
2882         return status;
2883 }
2884
2885 struct rpc_clnt *
2886 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2887                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2888 {
2889         int status;
2890         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2891
2892         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2893         if (status < 0) {
2894                 rpc_shutdown_client(client);
2895                 return ERR_PTR(status);
2896         }
2897         return client;
2898 }
2899
2900 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2901 {
2902         struct nfs_server *server = NFS_SERVER(inode);
2903         struct nfs4_accessargs args = {
2904                 .fh = NFS_FH(inode),
2905                 .bitmask = server->cache_consistency_bitmask,
2906         };
2907         struct nfs4_accessres res = {
2908                 .server = server,
2909         };
2910         struct rpc_message msg = {
2911                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2912                 .rpc_argp = &args,
2913                 .rpc_resp = &res,
2914                 .rpc_cred = entry->cred,
2915         };
2916         int mode = entry->mask;
2917         int status;
2918
2919         /*
2920          * Determine which access bits we want to ask for...
2921          */
2922         if (mode & MAY_READ)
2923                 args.access |= NFS4_ACCESS_READ;
2924         if (S_ISDIR(inode->i_mode)) {
2925                 if (mode & MAY_WRITE)
2926                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2927                 if (mode & MAY_EXEC)
2928                         args.access |= NFS4_ACCESS_LOOKUP;
2929         } else {
2930                 if (mode & MAY_WRITE)
2931                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2932                 if (mode & MAY_EXEC)
2933                         args.access |= NFS4_ACCESS_EXECUTE;
2934         }
2935
2936         res.fattr = nfs_alloc_fattr();
2937         if (res.fattr == NULL)
2938                 return -ENOMEM;
2939
2940         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2941         if (!status) {
2942                 nfs_access_set_mask(entry, res.access);
2943                 nfs_refresh_inode(inode, res.fattr);
2944         }
2945         nfs_free_fattr(res.fattr);
2946         return status;
2947 }
2948
2949 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2950 {
2951         struct nfs4_exception exception = { };
2952         int err;
2953         do {
2954                 err = nfs4_handle_exception(NFS_SERVER(inode),
2955                                 _nfs4_proc_access(inode, entry),
2956                                 &exception);
2957         } while (exception.retry);
2958         return err;
2959 }
2960
2961 /*
2962  * TODO: For the time being, we don't try to get any attributes
2963  * along with any of the zero-copy operations READ, READDIR,
2964  * READLINK, WRITE.
2965  *
2966  * In the case of the first three, we want to put the GETATTR
2967  * after the read-type operation -- this is because it is hard
2968  * to predict the length of a GETATTR response in v4, and thus
2969  * align the READ data correctly.  This means that the GETATTR
2970  * may end up partially falling into the page cache, and we should
2971  * shift it into the 'tail' of the xdr_buf before processing.
2972  * To do this efficiently, we need to know the total length
2973  * of data received, which doesn't seem to be available outside
2974  * of the RPC layer.
2975  *
2976  * In the case of WRITE, we also want to put the GETATTR after
2977  * the operation -- in this case because we want to make sure
2978  * we get the post-operation mtime and size.
2979  *
2980  * Both of these changes to the XDR layer would in fact be quite
2981  * minor, but I decided to leave them for a subsequent patch.
2982  */
2983 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2984                 unsigned int pgbase, unsigned int pglen)
2985 {
2986         struct nfs4_readlink args = {
2987                 .fh       = NFS_FH(inode),
2988                 .pgbase   = pgbase,
2989                 .pglen    = pglen,
2990                 .pages    = &page,
2991         };
2992         struct nfs4_readlink_res res;
2993         struct rpc_message msg = {
2994                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2995                 .rpc_argp = &args,
2996                 .rpc_resp = &res,
2997         };
2998
2999         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3000 }
3001
3002 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3003                 unsigned int pgbase, unsigned int pglen)
3004 {
3005         struct nfs4_exception exception = { };
3006         int err;
3007         do {
3008                 err = nfs4_handle_exception(NFS_SERVER(inode),
3009                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
3010                                 &exception);
3011         } while (exception.retry);
3012         return err;
3013 }
3014
3015 /*
3016  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3017  */
3018 static int
3019 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3020                  int flags)
3021 {
3022         struct nfs_open_context *ctx;
3023         struct nfs4_state *state;
3024         int status = 0;
3025
3026         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3027         if (IS_ERR(ctx))
3028                 return PTR_ERR(ctx);
3029
3030         sattr->ia_mode &= ~current_umask();
3031         state = nfs4_do_open(dir, dentry, ctx->mode,
3032                         flags, sattr, ctx->cred,
3033                         &ctx->mdsthreshold);
3034         d_drop(dentry);
3035         if (IS_ERR(state)) {
3036                 status = PTR_ERR(state);
3037                 goto out;
3038         }
3039         d_add(dentry, igrab(state->inode));
3040         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
3041         ctx->state = state;
3042 out:
3043         put_nfs_open_context(ctx);
3044         return status;
3045 }
3046
3047 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3048 {
3049         struct nfs_server *server = NFS_SERVER(dir);
3050         struct nfs_removeargs args = {
3051                 .fh = NFS_FH(dir),
3052                 .name = *name,
3053         };
3054         struct nfs_removeres res = {
3055                 .server = server,
3056         };
3057         struct rpc_message msg = {
3058                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3059                 .rpc_argp = &args,
3060                 .rpc_resp = &res,
3061         };
3062         int status;
3063
3064         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3065         if (status == 0)
3066                 update_changeattr(dir, &res.cinfo);
3067         return status;
3068 }
3069
3070 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3071 {
3072         struct nfs4_exception exception = { };
3073         int err;
3074         do {
3075                 err = nfs4_handle_exception(NFS_SERVER(dir),
3076                                 _nfs4_proc_remove(dir, name),
3077                                 &exception);
3078         } while (exception.retry);
3079         return err;
3080 }
3081
3082 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3083 {
3084         struct nfs_server *server = NFS_SERVER(dir);
3085         struct nfs_removeargs *args = msg->rpc_argp;
3086         struct nfs_removeres *res = msg->rpc_resp;
3087
3088         res->server = server;
3089         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3090         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3091 }
3092
3093 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3094 {
3095         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
3096                                 &data->args.seq_args,
3097                                 &data->res.seq_res,
3098                                 task))
3099                 return;
3100         rpc_call_start(task);
3101 }
3102
3103 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3104 {
3105         struct nfs_removeres *res = task->tk_msg.rpc_resp;
3106
3107         if (!nfs4_sequence_done(task, &res->seq_res))
3108                 return 0;
3109         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3110                 return 0;
3111         update_changeattr(dir, &res->cinfo);
3112         return 1;
3113 }
3114
3115 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3116 {
3117         struct nfs_server *server = NFS_SERVER(dir);
3118         struct nfs_renameargs *arg = msg->rpc_argp;
3119         struct nfs_renameres *res = msg->rpc_resp;
3120
3121         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3122         res->server = server;
3123         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3124 }
3125
3126 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3127 {
3128         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3129                                 &data->args.seq_args,
3130                                 &data->res.seq_res,
3131                                 task))
3132                 return;
3133         rpc_call_start(task);
3134 }
3135
3136 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3137                                  struct inode *new_dir)
3138 {
3139         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3140
3141         if (!nfs4_sequence_done(task, &res->seq_res))
3142                 return 0;
3143         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3144                 return 0;
3145
3146         update_changeattr(old_dir, &res->old_cinfo);
3147         update_changeattr(new_dir, &res->new_cinfo);
3148         return 1;
3149 }
3150
3151 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3152                 struct inode *new_dir, struct qstr *new_name)
3153 {
3154         struct nfs_server *server = NFS_SERVER(old_dir);
3155         struct nfs_renameargs arg = {
3156                 .old_dir = NFS_FH(old_dir),
3157                 .new_dir = NFS_FH(new_dir),
3158                 .old_name = old_name,
3159                 .new_name = new_name,
3160         };
3161         struct nfs_renameres res = {
3162                 .server = server,
3163         };
3164         struct rpc_message msg = {
3165                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3166                 .rpc_argp = &arg,
3167                 .rpc_resp = &res,
3168         };
3169         int status = -ENOMEM;
3170
3171         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3172         if (!status) {
3173                 update_changeattr(old_dir, &res.old_cinfo);
3174                 update_changeattr(new_dir, &res.new_cinfo);
3175         }
3176         return status;
3177 }
3178
3179 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3180                 struct inode *new_dir, struct qstr *new_name)
3181 {
3182         struct nfs4_exception exception = { };
3183         int err;
3184         do {
3185                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3186                                 _nfs4_proc_rename(old_dir, old_name,
3187                                         new_dir, new_name),
3188                                 &exception);
3189         } while (exception.retry);
3190         return err;
3191 }
3192
3193 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3194 {
3195         struct nfs_server *server = NFS_SERVER(inode);
3196         struct nfs4_link_arg arg = {
3197                 .fh     = NFS_FH(inode),
3198                 .dir_fh = NFS_FH(dir),
3199                 .name   = name,
3200                 .bitmask = server->attr_bitmask,
3201         };
3202         struct nfs4_link_res res = {
3203                 .server = server,
3204         };
3205         struct rpc_message msg = {
3206                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3207                 .rpc_argp = &arg,
3208                 .rpc_resp = &res,
3209         };
3210         int status = -ENOMEM;
3211
3212         res.fattr = nfs_alloc_fattr();
3213         if (res.fattr == NULL)
3214                 goto out;
3215
3216         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3217         if (!status) {
3218                 update_changeattr(dir, &res.cinfo);
3219                 nfs_post_op_update_inode(inode, res.fattr);
3220         }
3221 out:
3222         nfs_free_fattr(res.fattr);
3223         return status;
3224 }
3225
3226 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3227 {
3228         struct nfs4_exception exception = { };
3229         int err;
3230         do {
3231                 err = nfs4_handle_exception(NFS_SERVER(inode),
3232                                 _nfs4_proc_link(inode, dir, name),
3233                                 &exception);
3234         } while (exception.retry);
3235         return err;
3236 }
3237
3238 struct nfs4_createdata {
3239         struct rpc_message msg;
3240         struct nfs4_create_arg arg;
3241         struct nfs4_create_res res;
3242         struct nfs_fh fh;
3243         struct nfs_fattr fattr;
3244 };
3245
3246 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3247                 struct qstr *name, struct iattr *sattr, u32 ftype)
3248 {
3249         struct nfs4_createdata *data;
3250
3251         data = kzalloc(sizeof(*data), GFP_KERNEL);
3252         if (data != NULL) {
3253                 struct nfs_server *server = NFS_SERVER(dir);
3254
3255                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3256                 data->msg.rpc_argp = &data->arg;
3257                 data->msg.rpc_resp = &data->res;
3258                 data->arg.dir_fh = NFS_FH(dir);
3259                 data->arg.server = server;
3260                 data->arg.name = name;
3261                 data->arg.attrs = sattr;
3262                 data->arg.ftype = ftype;
3263                 data->arg.bitmask = server->attr_bitmask;
3264                 data->res.server = server;
3265                 data->res.fh = &data->fh;
3266                 data->res.fattr = &data->fattr;
3267                 nfs_fattr_init(data->res.fattr);
3268         }
3269         return data;
3270 }
3271
3272 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3273 {
3274         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3275                                     &data->arg.seq_args, &data->res.seq_res, 1);
3276         if (status == 0) {
3277                 update_changeattr(dir, &data->res.dir_cinfo);
3278                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3279         }
3280         return status;
3281 }
3282
3283 static void nfs4_free_createdata(struct nfs4_createdata *data)
3284 {
3285         kfree(data);
3286 }
3287
3288 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3289                 struct page *page, unsigned int len, struct iattr *sattr)
3290 {
3291         struct nfs4_createdata *data;
3292         int status = -ENAMETOOLONG;
3293
3294         if (len > NFS4_MAXPATHLEN)
3295                 goto out;
3296
3297         status = -ENOMEM;
3298         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3299         if (data == NULL)
3300                 goto out;
3301
3302         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3303         data->arg.u.symlink.pages = &page;
3304         data->arg.u.symlink.len = len;
3305
3306         status = nfs4_do_create(dir, dentry, data);
3307
3308         nfs4_free_createdata(data);
3309 out:
3310         return status;
3311 }
3312
3313 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3314                 struct page *page, unsigned int len, struct iattr *sattr)
3315 {
3316         struct nfs4_exception exception = { };
3317         int err;
3318         do {
3319                 err = nfs4_handle_exception(NFS_SERVER(dir),
3320                                 _nfs4_proc_symlink(dir, dentry, page,
3321                                                         len, sattr),
3322                                 &exception);
3323         } while (exception.retry);
3324         return err;
3325 }
3326
3327 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3328                 struct iattr *sattr)
3329 {
3330         struct nfs4_createdata *data;
3331         int status = -ENOMEM;
3332
3333         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3334         if (data == NULL)
3335                 goto out;
3336
3337         status = nfs4_do_create(dir, dentry, data);
3338
3339         nfs4_free_createdata(data);
3340 out:
3341         return status;
3342 }
3343
3344 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3345                 struct iattr *sattr)
3346 {
3347         struct nfs4_exception exception = { };
3348         int err;
3349
3350         sattr->ia_mode &= ~current_umask();
3351         do {
3352                 err = nfs4_handle_exception(NFS_SERVER(dir),
3353                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3354                                 &exception);
3355         } while (exception.retry);
3356         return err;
3357 }
3358
3359 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3360                 u64 cookie, struct page **pages, unsigned int count, int plus)
3361 {
3362         struct inode            *dir = dentry->d_inode;
3363         struct nfs4_readdir_arg args = {
3364                 .fh = NFS_FH(dir),
3365                 .pages = pages,
3366                 .pgbase = 0,
3367                 .count = count,
3368                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3369                 .plus = plus,
3370         };
3371         struct nfs4_readdir_res res;
3372         struct rpc_message msg = {
3373                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3374                 .rpc_argp = &args,
3375                 .rpc_resp = &res,
3376                 .rpc_cred = cred,
3377         };
3378         int                     status;
3379
3380         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3381                         dentry->d_parent->d_name.name,
3382                         dentry->d_name.name,
3383                         (unsigned long long)cookie);
3384         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3385         res.pgbase = args.pgbase;
3386         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3387         if (status >= 0) {
3388                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3389                 status += args.pgbase;
3390         }
3391
3392         nfs_invalidate_atime(dir);
3393
3394         dprintk("%s: returns %d\n", __func__, status);
3395         return status;
3396 }
3397
3398 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3399                 u64 cookie, struct page **pages, unsigned int count, int plus)
3400 {
3401         struct nfs4_exception exception = { };
3402         int err;
3403         do {
3404                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3405                                 _nfs4_proc_readdir(dentry, cred, cookie,
3406                                         pages, count, plus),
3407                                 &exception);
3408         } while (exception.retry);
3409         return err;
3410 }
3411
3412 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3413                 struct iattr *sattr, dev_t rdev)
3414 {
3415         struct nfs4_createdata *data;
3416         int mode = sattr->ia_mode;
3417         int status = -ENOMEM;
3418
3419         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3420         if (data == NULL)
3421                 goto out;
3422
3423         if (S_ISFIFO(mode))
3424                 data->arg.ftype = NF4FIFO;
3425         else if (S_ISBLK(mode)) {
3426                 data->arg.ftype = NF4BLK;
3427                 data->arg.u.device.specdata1 = MAJOR(rdev);
3428                 data->arg.u.device.specdata2 = MINOR(rdev);
3429         }
3430         else if (S_ISCHR(mode)) {
3431                 data->arg.ftype = NF4CHR;
3432                 data->arg.u.device.specdata1 = MAJOR(rdev);
3433                 data->arg.u.device.specdata2 = MINOR(rdev);
3434         } else if (!S_ISSOCK(mode)) {
3435                 status = -EINVAL;
3436                 goto out_free;
3437         }
3438
3439         status = nfs4_do_create(dir, dentry, data);
3440 out_free:
3441         nfs4_free_createdata(data);
3442 out:
3443         return status;
3444 }
3445
3446 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3447                 struct iattr *sattr, dev_t rdev)
3448 {
3449         struct nfs4_exception exception = { };
3450         int err;
3451
3452         sattr->ia_mode &= ~current_umask();
3453         do {
3454                 err = nfs4_handle_exception(NFS_SERVER(dir),
3455                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3456                                 &exception);
3457         } while (exception.retry);
3458         return err;
3459 }
3460
3461 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3462                  struct nfs_fsstat *fsstat)
3463 {
3464         struct nfs4_statfs_arg args = {
3465                 .fh = fhandle,
3466                 .bitmask = server->attr_bitmask,
3467         };
3468         struct nfs4_statfs_res res = {
3469                 .fsstat = fsstat,
3470         };
3471         struct rpc_message msg = {
3472                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3473                 .rpc_argp = &args,
3474                 .rpc_resp = &res,
3475         };
3476
3477         nfs_fattr_init(fsstat->fattr);
3478         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3479 }
3480
3481 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3482 {
3483         struct nfs4_exception exception = { };
3484         int err;
3485         do {
3486                 err = nfs4_handle_exception(server,
3487                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3488                                 &exception);
3489         } while (exception.retry);
3490         return err;
3491 }
3492
3493 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3494                 struct nfs_fsinfo *fsinfo)
3495 {
3496         struct nfs4_fsinfo_arg args = {
3497                 .fh = fhandle,
3498                 .bitmask = server->attr_bitmask,
3499         };
3500         struct nfs4_fsinfo_res res = {
3501                 .fsinfo = fsinfo,
3502         };
3503         struct rpc_message msg = {
3504                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3505                 .rpc_argp = &args,
3506                 .rpc_resp = &res,
3507         };
3508
3509         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3510 }
3511
3512 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3513 {
3514         struct nfs4_exception exception = { };
3515         int err;
3516
3517         do {
3518                 err = nfs4_handle_exception(server,
3519                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3520                                 &exception);
3521         } while (exception.retry);
3522         return err;
3523 }
3524
3525 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3526 {
3527         int error;
3528
3529         nfs_fattr_init(fsinfo->fattr);
3530         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3531         if (error == 0) {
3532                 /* block layout checks this! */
3533                 server->pnfs_blksize = fsinfo->blksize;
3534                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3535         }
3536
3537         return error;
3538 }
3539
3540 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3541                 struct nfs_pathconf *pathconf)
3542 {
3543         struct nfs4_pathconf_arg args = {
3544                 .fh = fhandle,
3545                 .bitmask = server->attr_bitmask,
3546         };
3547         struct nfs4_pathconf_res res = {
3548                 .pathconf = pathconf,
3549         };
3550         struct rpc_message msg = {
3551                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3552                 .rpc_argp = &args,
3553                 .rpc_resp = &res,
3554         };
3555
3556         /* None of the pathconf attributes are mandatory to implement */
3557         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3558                 memset(pathconf, 0, sizeof(*pathconf));
3559                 return 0;
3560         }
3561
3562         nfs_fattr_init(pathconf->fattr);
3563         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3564 }
3565
3566 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3567                 struct nfs_pathconf *pathconf)
3568 {
3569         struct nfs4_exception exception = { };
3570         int err;
3571
3572         do {
3573                 err = nfs4_handle_exception(server,
3574                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3575                                 &exception);
3576         } while (exception.retry);
3577         return err;
3578 }
3579
3580 void __nfs4_read_done_cb(struct nfs_read_data *data)
3581 {
3582         nfs_invalidate_atime(data->header->inode);
3583 }
3584
3585 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3586 {
3587         struct nfs_server *server = NFS_SERVER(data->header->inode);
3588
3589         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3590                 rpc_restart_call_prepare(task);
3591                 return -EAGAIN;
3592         }
3593
3594         __nfs4_read_done_cb(data);
3595         if (task->tk_status > 0)
3596                 renew_lease(server, data->timestamp);
3597         return 0;
3598 }
3599
3600 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3601 {
3602
3603         dprintk("--> %s\n", __func__);
3604
3605         if (!nfs4_sequence_done(task, &data->res.seq_res))
3606                 return -EAGAIN;
3607
3608         return data->read_done_cb ? data->read_done_cb(task, data) :
3609                                     nfs4_read_done_cb(task, data);
3610 }
3611
3612 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3613 {
3614         data->timestamp   = jiffies;
3615         data->read_done_cb = nfs4_read_done_cb;
3616         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3617         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3618 }
3619
3620 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3621 {
3622         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3623                                 &data->args.seq_args,
3624                                 &data->res.seq_res,
3625                                 task))
3626                 return;
3627         rpc_call_start(task);
3628 }
3629
3630 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3631 {
3632         struct inode *inode = data->header->inode;
3633
3634         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3635                 rpc_restart_call_prepare(task);
3636                 return -EAGAIN;
3637         }
3638         if (task->tk_status >= 0) {
3639                 renew_lease(NFS_SERVER(inode), data->timestamp);
3640                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3641         }
3642         return 0;
3643 }
3644
3645 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3646 {
3647         if (!nfs4_sequence_done(task, &data->res.seq_res))
3648                 return -EAGAIN;
3649         return data->write_done_cb ? data->write_done_cb(task, data) :
3650                 nfs4_write_done_cb(task, data);
3651 }
3652
3653 static
3654 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3655 {
3656         const struct nfs_pgio_header *hdr = data->header;
3657
3658         /* Don't request attributes for pNFS or O_DIRECT writes */
3659         if (data->ds_clp != NULL || hdr->dreq != NULL)
3660                 return false;
3661         /* Otherwise, request attributes if and only if we don't hold
3662          * a delegation
3663          */
3664         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3665 }
3666
3667 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3668 {
3669         struct nfs_server *server = NFS_SERVER(data->header->inode);
3670
3671         if (!nfs4_write_need_cache_consistency_data(data)) {
3672                 data->args.bitmask = NULL;
3673                 data->res.fattr = NULL;
3674         } else
3675                 data->args.bitmask = server->cache_consistency_bitmask;
3676
3677         if (!data->write_done_cb)
3678                 data->write_done_cb = nfs4_write_done_cb;
3679         data->res.server = server;
3680         data->timestamp   = jiffies;
3681
3682         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3683         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3684 }
3685
3686 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3687 {
3688         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3689                                 &data->args.seq_args,
3690                                 &data->res.seq_res,
3691                                 task))
3692                 return;
3693         rpc_call_start(task);
3694 }
3695
3696 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3697 {
3698         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3699                                 &data->args.seq_args,
3700                                 &data->res.seq_res,
3701                                 task))
3702                 return;
3703         rpc_call_start(task);
3704 }
3705
3706 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3707 {
3708         struct inode *inode = data->inode;
3709
3710         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3711                 rpc_restart_call_prepare(task);
3712                 return -EAGAIN;
3713         }
3714         return 0;
3715 }
3716
3717 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3718 {
3719         if (!nfs4_sequence_done(task, &data->res.seq_res))
3720                 return -EAGAIN;
3721         return data->commit_done_cb(task, data);
3722 }
3723
3724 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3725 {
3726         struct nfs_server *server = NFS_SERVER(data->inode);
3727
3728         if (data->commit_done_cb == NULL)
3729                 data->commit_done_cb = nfs4_commit_done_cb;
3730         data->res.server = server;
3731         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3732         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3733 }
3734
3735 struct nfs4_renewdata {
3736         struct nfs_client       *client;
3737         unsigned long           timestamp;
3738 };
3739
3740 /*
3741  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3742  * standalone procedure for queueing an asynchronous RENEW.
3743  */
3744 static void nfs4_renew_release(void *calldata)
3745 {
3746         struct nfs4_renewdata *data = calldata;
3747         struct nfs_client *clp = data->client;
3748
3749         if (atomic_read(&clp->cl_count) > 1)
3750                 nfs4_schedule_state_renewal(clp);
3751         nfs_put_client(clp);
3752         kfree(data);
3753 }
3754
3755 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3756 {
3757         struct nfs4_renewdata *data = calldata;
3758         struct nfs_client *clp = data->client;
3759         unsigned long timestamp = data->timestamp;
3760
3761         if (task->tk_status < 0) {
3762                 /* Unless we're shutting down, schedule state recovery! */
3763                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3764                         return;
3765                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3766                         nfs4_schedule_lease_recovery(clp);
3767                         return;
3768                 }
3769                 nfs4_schedule_path_down_recovery(clp);
3770         }
3771         do_renew_lease(clp, timestamp);
3772 }
3773
3774 static const struct rpc_call_ops nfs4_renew_ops = {
3775         .rpc_call_done = nfs4_renew_done,
3776         .rpc_release = nfs4_renew_release,
3777 };
3778
3779 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3780 {
3781         struct rpc_message msg = {
3782                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3783                 .rpc_argp       = clp,
3784                 .rpc_cred       = cred,
3785         };
3786         struct nfs4_renewdata *data;
3787
3788         if (renew_flags == 0)
3789                 return 0;
3790         if (!atomic_inc_not_zero(&clp->cl_count))
3791                 return -EIO;
3792         data = kmalloc(sizeof(*data), GFP_NOFS);
3793         if (data == NULL)
3794                 return -ENOMEM;
3795         data->client = clp;
3796         data->timestamp = jiffies;
3797         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3798                         &nfs4_renew_ops, data);
3799 }
3800
3801 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3802 {
3803         struct rpc_message msg = {
3804                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3805                 .rpc_argp       = clp,
3806                 .rpc_cred       = cred,
3807         };
3808         unsigned long now = jiffies;
3809         int status;
3810
3811         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3812         if (status < 0)
3813                 return status;
3814         do_renew_lease(clp, now);
3815         return 0;
3816 }
3817
3818 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3819 {
3820         return (server->caps & NFS_CAP_ACLS)
3821                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3822                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3823 }
3824
3825 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3826  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3827  * the stack.
3828  */
3829 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3830
3831 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3832                 struct page **pages, unsigned int *pgbase)
3833 {
3834         struct page *newpage, **spages;
3835         int rc = 0;
3836         size_t len;
3837         spages = pages;
3838
3839         do {
3840                 len = min_t(size_t, PAGE_SIZE, buflen);
3841                 newpage = alloc_page(GFP_KERNEL);
3842
3843                 if (newpage == NULL)
3844                         goto unwind;
3845                 memcpy(page_address(newpage), buf, len);
3846                 buf += len;
3847                 buflen -= len;
3848                 *pages++ = newpage;
3849                 rc++;
3850         } while (buflen != 0);
3851
3852         return rc;
3853
3854 unwind:
3855         for(; rc > 0; rc--)
3856                 __free_page(spages[rc-1]);
3857         return -ENOMEM;
3858 }
3859
3860 struct nfs4_cached_acl {
3861         int cached;
3862         size_t len;
3863         char data[0];
3864 };
3865
3866 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3867 {
3868         struct nfs_inode *nfsi = NFS_I(inode);
3869
3870         spin_lock(&inode->i_lock);
3871         kfree(nfsi->nfs4_acl);
3872         nfsi->nfs4_acl = acl;
3873         spin_unlock(&inode->i_lock);
3874 }
3875
3876 static void nfs4_zap_acl_attr(struct inode *inode)
3877 {
3878         nfs4_set_cached_acl(inode, NULL);
3879 }
3880
3881 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3882 {
3883         struct nfs_inode *nfsi = NFS_I(inode);
3884         struct nfs4_cached_acl *acl;
3885         int ret = -ENOENT;
3886
3887         spin_lock(&inode->i_lock);
3888         acl = nfsi->nfs4_acl;
3889         if (acl == NULL)
3890                 goto out;
3891         if (buf == NULL) /* user is just asking for length */
3892                 goto out_len;
3893         if (acl->cached == 0)
3894                 goto out;
3895         ret = -ERANGE; /* see getxattr(2) man page */
3896         if (acl->len > buflen)
3897                 goto out;
3898         memcpy(buf, acl->data, acl->len);
3899 out_len:
3900         ret = acl->len;
3901 out:
3902         spin_unlock(&inode->i_lock);
3903         return ret;
3904 }
3905
3906 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3907 {
3908         struct nfs4_cached_acl *acl;
3909         size_t buflen = sizeof(*acl) + acl_len;
3910
3911         if (buflen <= PAGE_SIZE) {
3912                 acl = kmalloc(buflen, GFP_KERNEL);
3913                 if (acl == NULL)
3914                         goto out;
3915                 acl->cached = 1;
3916                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3917         } else {
3918                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3919                 if (acl == NULL)
3920                         goto out;
3921                 acl->cached = 0;
3922         }
3923         acl->len = acl_len;
3924 out:
3925         nfs4_set_cached_acl(inode, acl);
3926 }
3927
3928 /*
3929  * The getxattr API returns the required buffer length when called with a
3930  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3931  * the required buf.  On a NULL buf, we send a page of data to the server
3932  * guessing that the ACL request can be serviced by a page. If so, we cache
3933  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3934  * the cache. If not so, we throw away the page, and cache the required
3935  * length. The next getxattr call will then produce another round trip to
3936  * the server, this time with the input buf of the required size.
3937  */
3938 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3939 {
3940         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3941         struct nfs_getaclargs args = {
3942                 .fh = NFS_FH(inode),
3943                 .acl_pages = pages,
3944                 .acl_len = buflen,
3945         };
3946         struct nfs_getaclres res = {
3947                 .acl_len = buflen,
3948         };
3949         struct rpc_message msg = {
3950                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3951                 .rpc_argp = &args,
3952                 .rpc_resp = &res,
3953         };
3954         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3955         int ret = -ENOMEM, i;
3956
3957         /* As long as we're doing a round trip to the server anyway,
3958          * let's be prepared for a page of acl data. */
3959         if (npages == 0)
3960                 npages = 1;
3961         if (npages > ARRAY_SIZE(pages))
3962                 return -ERANGE;
3963
3964         for (i = 0; i < npages; i++) {
3965                 pages[i] = alloc_page(GFP_KERNEL);
3966                 if (!pages[i])
3967                         goto out_free;
3968         }
3969
3970         /* for decoding across pages */
3971         res.acl_scratch = alloc_page(GFP_KERNEL);
3972         if (!res.acl_scratch)
3973                 goto out_free;
3974
3975         args.acl_len = npages * PAGE_SIZE;
3976         args.acl_pgbase = 0;
3977
3978         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3979                 __func__, buf, buflen, npages, args.acl_len);
3980         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3981                              &msg, &args.seq_args, &res.seq_res, 0);
3982         if (ret)
3983                 goto out_free;
3984
3985         /* Handle the case where the passed-in buffer is too short */
3986         if (res.acl_flags & NFS4_ACL_TRUNC) {
3987                 /* Did the user only issue a request for the acl length? */
3988                 if (buf == NULL)
3989                         goto out_ok;
3990                 ret = -ERANGE;
3991                 goto out_free;
3992         }
3993         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3994         if (buf)
3995                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3996 out_ok:
3997         ret = res.acl_len;
3998 out_free:
3999         for (i = 0; i < npages; i++)
4000                 if (pages[i])
4001                         __free_page(pages[i]);
4002         if (res.acl_scratch)
4003                 __free_page(res.acl_scratch);
4004         return ret;
4005 }
4006
4007 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4008 {
4009         struct nfs4_exception exception = { };
4010         ssize_t ret;
4011         do {
4012                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4013                 if (ret >= 0)
4014                         break;
4015                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4016         } while (exception.retry);
4017         return ret;
4018 }
4019
4020 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4021 {
4022         struct nfs_server *server = NFS_SERVER(inode);
4023         int ret;
4024
4025         if (!nfs4_server_supports_acls(server))
4026                 return -EOPNOTSUPP;
4027         ret = nfs_revalidate_inode(server, inode);
4028         if (ret < 0)
4029                 return ret;
4030         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4031                 nfs_zap_acl_cache(inode);
4032         ret = nfs4_read_cached_acl(inode, buf, buflen);
4033         if (ret != -ENOENT)
4034                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4035                  * but no cached acl data, just the acl length */
4036                 return ret;
4037         return nfs4_get_acl_uncached(inode, buf, buflen);
4038 }
4039
4040 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4041 {
4042         struct nfs_server *server = NFS_SERVER(inode);
4043         struct page *pages[NFS4ACL_MAXPAGES];
4044         struct nfs_setaclargs arg = {
4045                 .fh             = NFS_FH(inode),
4046                 .acl_pages      = pages,
4047                 .acl_len        = buflen,
4048         };
4049         struct nfs_setaclres res;
4050         struct rpc_message msg = {
4051                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4052                 .rpc_argp       = &arg,
4053                 .rpc_resp       = &res,
4054         };
4055         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4056         int ret, i;
4057
4058         if (!nfs4_server_supports_acls(server))
4059                 return -EOPNOTSUPP;
4060         if (npages > ARRAY_SIZE(pages))
4061                 return -ERANGE;
4062         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4063         if (i < 0)
4064                 return i;
4065         nfs4_inode_return_delegation(inode);
4066         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4067
4068         /*
4069          * Free each page after tx, so the only ref left is
4070          * held by the network stack
4071          */
4072         for (; i > 0; i--)
4073                 put_page(pages[i-1]);
4074
4075         /*
4076          * Acl update can result in inode attribute update.
4077          * so mark the attribute cache invalid.
4078          */
4079         spin_lock(&inode->i_lock);
4080         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4081         spin_unlock(&inode->i_lock);
4082         nfs_access_zap_cache(inode);
4083         nfs_zap_acl_cache(inode);
4084         return ret;
4085 }
4086
4087 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4088 {
4089         struct nfs4_exception exception = { };
4090         int err;
4091         do {
4092                 err = nfs4_handle_exception(NFS_SERVER(inode),
4093                                 __nfs4_proc_set_acl(inode, buf, buflen),
4094                                 &exception);
4095         } while (exception.retry);
4096         return err;
4097 }
4098
4099 static int
4100 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4101 {
4102         struct nfs_client *clp = server->nfs_client;
4103
4104         if (task->tk_status >= 0)
4105                 return 0;
4106         switch(task->tk_status) {
4107                 case -NFS4ERR_DELEG_REVOKED:
4108                 case -NFS4ERR_ADMIN_REVOKED:
4109                 case -NFS4ERR_BAD_STATEID:
4110                         if (state == NULL)
4111                                 break;
4112                         nfs_remove_bad_delegation(state->inode);
4113                 case -NFS4ERR_OPENMODE:
4114                         if (state == NULL)
4115                                 break;
4116                         nfs4_schedule_stateid_recovery(server, state);
4117                         goto wait_on_recovery;
4118                 case -NFS4ERR_EXPIRED:
4119                         if (state != NULL)
4120                                 nfs4_schedule_stateid_recovery(server, state);
4121                 case -NFS4ERR_STALE_STATEID:
4122                 case -NFS4ERR_STALE_CLIENTID:
4123                         nfs4_schedule_lease_recovery(clp);
4124                         goto wait_on_recovery;
4125 #if defined(CONFIG_NFS_V4_1)
4126                 case -NFS4ERR_BADSESSION:
4127                 case -NFS4ERR_BADSLOT:
4128                 case -NFS4ERR_BAD_HIGH_SLOT:
4129                 case -NFS4ERR_DEADSESSION:
4130                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4131                 case -NFS4ERR_SEQ_FALSE_RETRY:
4132                 case -NFS4ERR_SEQ_MISORDERED:
4133                         dprintk("%s ERROR %d, Reset session\n", __func__,
4134                                 task->tk_status);
4135                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4136                         task->tk_status = 0;
4137                         return -EAGAIN;
4138 #endif /* CONFIG_NFS_V4_1 */
4139                 case -NFS4ERR_DELAY:
4140                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4141                 case -NFS4ERR_GRACE:
4142                 case -EKEYEXPIRED:
4143                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4144                         task->tk_status = 0;
4145                         return -EAGAIN;
4146                 case -NFS4ERR_RETRY_UNCACHED_REP:
4147                 case -NFS4ERR_OLD_STATEID:
4148                         task->tk_status = 0;
4149                         return -EAGAIN;
4150         }
4151         task->tk_status = nfs4_map_errors(task->tk_status);
4152         return 0;
4153 wait_on_recovery:
4154         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4155         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4156                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4157         task->tk_status = 0;
4158         return -EAGAIN;
4159 }
4160
4161 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4162                                     nfs4_verifier *bootverf)
4163 {
4164         __be32 verf[2];
4165
4166         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4167                 /* An impossible timestamp guarantees this value
4168                  * will never match a generated boot time. */
4169                 verf[0] = 0;
4170                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4171         } else {
4172                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4173                 verf[0] = (__be32)nn->boot_time.tv_sec;
4174                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4175         }
4176         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4177 }
4178
4179 static unsigned int
4180 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4181                                    char *buf, size_t len)
4182 {
4183         unsigned int result;
4184
4185         rcu_read_lock();
4186         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4187                                 clp->cl_ipaddr,
4188                                 rpc_peeraddr2str(clp->cl_rpcclient,
4189                                                         RPC_DISPLAY_ADDR),
4190                                 rpc_peeraddr2str(clp->cl_rpcclient,
4191                                                         RPC_DISPLAY_PROTO));
4192         rcu_read_unlock();
4193         return result;
4194 }
4195
4196 static unsigned int
4197 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4198                                 char *buf, size_t len)
4199 {
4200         char *nodename = clp->cl_rpcclient->cl_nodename;
4201
4202         if (nfs4_client_id_uniquifier[0] != '\0')
4203                 nodename = nfs4_client_id_uniquifier;
4204         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4205                                 clp->rpc_ops->version, clp->cl_minorversion,
4206                                 nodename);
4207 }
4208
4209 /**
4210  * nfs4_proc_setclientid - Negotiate client ID
4211  * @clp: state data structure
4212  * @program: RPC program for NFSv4 callback service
4213  * @port: IP port number for NFS4 callback service
4214  * @cred: RPC credential to use for this call
4215  * @res: where to place the result
4216  *
4217  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4218  */
4219 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4220                 unsigned short port, struct rpc_cred *cred,
4221                 struct nfs4_setclientid_res *res)
4222 {
4223         nfs4_verifier sc_verifier;
4224         struct nfs4_setclientid setclientid = {
4225                 .sc_verifier = &sc_verifier,
4226                 .sc_prog = program,
4227                 .sc_cb_ident = clp->cl_cb_ident,
4228         };
4229         struct rpc_message msg = {
4230                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4231                 .rpc_argp = &setclientid,
4232                 .rpc_resp = res,
4233                 .rpc_cred = cred,
4234         };
4235         int status;
4236
4237         /* nfs_client_id4 */
4238         nfs4_init_boot_verifier(clp, &sc_verifier);
4239         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4240                 setclientid.sc_name_len =
4241                                 nfs4_init_uniform_client_string(clp,
4242                                                 setclientid.sc_name,
4243                                                 sizeof(setclientid.sc_name));
4244         else
4245                 setclientid.sc_name_len =
4246                                 nfs4_init_nonuniform_client_string(clp,
4247                                                 setclientid.sc_name,
4248                                                 sizeof(setclientid.sc_name));
4249         /* cb_client4 */
4250         rcu_read_lock();
4251         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4252                                 sizeof(setclientid.sc_netid),
4253                                 rpc_peeraddr2str(clp->cl_rpcclient,
4254                                                         RPC_DISPLAY_NETID));
4255         rcu_read_unlock();
4256         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4257                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4258                                 clp->cl_ipaddr, port >> 8, port & 255);
4259
4260         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4261                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4262                 setclientid.sc_name_len, setclientid.sc_name);
4263         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4264         dprintk("NFS reply setclientid: %d\n", status);
4265         return status;
4266 }
4267
4268 /**
4269  * nfs4_proc_setclientid_confirm - Confirm client ID
4270  * @clp: state data structure
4271  * @res: result of a previous SETCLIENTID
4272  * @cred: RPC credential to use for this call
4273  *
4274  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4275  */
4276 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4277                 struct nfs4_setclientid_res *arg,
4278                 struct rpc_cred *cred)
4279 {
4280         struct nfs_fsinfo fsinfo;
4281         struct rpc_message msg = {
4282                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4283                 .rpc_argp = arg,
4284                 .rpc_resp = &fsinfo,
4285                 .rpc_cred = cred,
4286         };
4287         unsigned long now;
4288         int status;
4289
4290         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4291                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4292                 clp->cl_clientid);
4293         now = jiffies;
4294         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4295         if (status == 0) {
4296                 spin_lock(&clp->cl_lock);
4297                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4298                 clp->cl_last_renewal = now;
4299                 spin_unlock(&clp->cl_lock);
4300         }
4301         dprintk("NFS reply setclientid_confirm: %d\n", status);
4302         return status;
4303 }
4304
4305 struct nfs4_delegreturndata {
4306         struct nfs4_delegreturnargs args;
4307         struct nfs4_delegreturnres res;
4308         struct nfs_fh fh;
4309         nfs4_stateid stateid;
4310         unsigned long timestamp;
4311         struct nfs_fattr fattr;
4312         int rpc_status;
4313 };
4314
4315 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4316 {
4317         struct nfs4_delegreturndata *data = calldata;
4318
4319         if (!nfs4_sequence_done(task, &data->res.seq_res))
4320                 return;
4321
4322         switch (task->tk_status) {
4323         case -NFS4ERR_STALE_STATEID:
4324         case -NFS4ERR_EXPIRED:
4325         case 0:
4326                 renew_lease(data->res.server, data->timestamp);
4327                 break;
4328         default:
4329                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4330                                 -EAGAIN) {
4331                         rpc_restart_call_prepare(task);
4332                         return;
4333                 }
4334         }
4335         data->rpc_status = task->tk_status;
4336 }
4337
4338 static void nfs4_delegreturn_release(void *calldata)
4339 {
4340         kfree(calldata);
4341 }
4342
4343 #if defined(CONFIG_NFS_V4_1)
4344 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4345 {
4346         struct nfs4_delegreturndata *d_data;
4347
4348         d_data = (struct nfs4_delegreturndata *)data;
4349
4350         if (nfs4_setup_sequence(d_data->res.server,
4351                                 &d_data->args.seq_args,
4352                                 &d_data->res.seq_res, task))
4353                 return;
4354         rpc_call_start(task);
4355 }
4356 #endif /* CONFIG_NFS_V4_1 */
4357
4358 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4359 #if defined(CONFIG_NFS_V4_1)
4360         .rpc_call_prepare = nfs4_delegreturn_prepare,
4361 #endif /* CONFIG_NFS_V4_1 */
4362         .rpc_call_done = nfs4_delegreturn_done,
4363         .rpc_release = nfs4_delegreturn_release,
4364 };
4365
4366 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4367 {
4368         struct nfs4_delegreturndata *data;
4369         struct nfs_server *server = NFS_SERVER(inode);
4370         struct rpc_task *task;
4371         struct rpc_message msg = {
4372                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4373                 .rpc_cred = cred,
4374         };
4375         struct rpc_task_setup task_setup_data = {
4376                 .rpc_client = server->client,
4377                 .rpc_message = &msg,
4378                 .callback_ops = &nfs4_delegreturn_ops,
4379                 .flags = RPC_TASK_ASYNC,
4380         };
4381         int status = 0;
4382
4383         data = kzalloc(sizeof(*data), GFP_NOFS);
4384         if (data == NULL)
4385                 return -ENOMEM;
4386         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4387         data->args.fhandle = &data->fh;
4388         data->args.stateid = &data->stateid;
4389         data->args.bitmask = server->cache_consistency_bitmask;
4390         nfs_copy_fh(&data->fh, NFS_FH(inode));
4391         nfs4_stateid_copy(&data->stateid, stateid);
4392         data->res.fattr = &data->fattr;
4393         data->res.server = server;
4394         nfs_fattr_init(data->res.fattr);
4395         data->timestamp = jiffies;
4396         data->rpc_status = 0;
4397
4398         task_setup_data.callback_data = data;
4399         msg.rpc_argp = &data->args;
4400         msg.rpc_resp = &data->res;
4401         task = rpc_run_task(&task_setup_data);
4402         if (IS_ERR(task))
4403                 return PTR_ERR(task);
4404         if (!issync)
4405                 goto out;
4406         status = nfs4_wait_for_completion_rpc_task(task);
4407         if (status != 0)
4408                 goto out;
4409         status = data->rpc_status;
4410         if (status == 0)
4411                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4412         else
4413                 nfs_refresh_inode(inode, &data->fattr);
4414 out:
4415         rpc_put_task(task);
4416         return status;
4417 }
4418
4419 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4420 {
4421         struct nfs_server *server = NFS_SERVER(inode);
4422         struct nfs4_exception exception = { };
4423         int err;
4424         do {
4425                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4426                 switch (err) {
4427                         case -NFS4ERR_STALE_STATEID:
4428                         case -NFS4ERR_EXPIRED:
4429                         case 0:
4430                                 return 0;
4431                 }
4432                 err = nfs4_handle_exception(server, err, &exception);
4433         } while (exception.retry);
4434         return err;
4435 }
4436
4437 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4438 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4439
4440 /*
4441  * sleep, with exponential backoff, and retry the LOCK operation.
4442  */
4443 static unsigned long
4444 nfs4_set_lock_task_retry(unsigned long timeout)
4445 {
4446         freezable_schedule_timeout_killable(timeout);
4447         timeout <<= 1;
4448         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4449                 return NFS4_LOCK_MAXTIMEOUT;
4450         return timeout;
4451 }
4452
4453 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4454 {
4455         struct inode *inode = state->inode;
4456         struct nfs_server *server = NFS_SERVER(inode);
4457         struct nfs_client *clp = server->nfs_client;
4458         struct nfs_lockt_args arg = {
4459                 .fh = NFS_FH(inode),
4460                 .fl = request,
4461         };
4462         struct nfs_lockt_res res = {
4463                 .denied = request,
4464         };
4465         struct rpc_message msg = {
4466                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4467                 .rpc_argp       = &arg,
4468                 .rpc_resp       = &res,
4469                 .rpc_cred       = state->owner->so_cred,
4470         };
4471         struct nfs4_lock_state *lsp;
4472         int status;
4473
4474         arg.lock_owner.clientid = clp->cl_clientid;
4475         status = nfs4_set_lock_state(state, request);
4476         if (status != 0)
4477                 goto out;
4478         lsp = request->fl_u.nfs4_fl.owner;
4479         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4480         arg.lock_owner.s_dev = server->s_dev;
4481         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4482         switch (status) {
4483                 case 0:
4484                         request->fl_type = F_UNLCK;
4485                         break;
4486                 case -NFS4ERR_DENIED:
4487                         status = 0;
4488         }
4489         request->fl_ops->fl_release_private(request);
4490 out:
4491         return status;
4492 }
4493
4494 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4495 {
4496         struct nfs4_exception exception = { };
4497         int err;
4498
4499         do {
4500                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4501                                 _nfs4_proc_getlk(state, cmd, request),
4502                                 &exception);
4503         } while (exception.retry);
4504         return err;
4505 }
4506
4507 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4508 {
4509         int res = 0;
4510         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4511                 case FL_POSIX:
4512                         res = posix_lock_file_wait(file, fl);
4513                         break;
4514                 case FL_FLOCK:
4515                         res = flock_lock_file_wait(file, fl);
4516                         break;
4517                 default:
4518                         BUG();
4519         }
4520         return res;
4521 }
4522
4523 struct nfs4_unlockdata {
4524         struct nfs_locku_args arg;
4525         struct nfs_locku_res res;
4526         struct nfs4_lock_state *lsp;
4527         struct nfs_open_context *ctx;
4528         struct file_lock fl;
4529         const struct nfs_server *server;
4530         unsigned long timestamp;
4531 };
4532
4533 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4534                 struct nfs_open_context *ctx,
4535                 struct nfs4_lock_state *lsp,
4536                 struct nfs_seqid *seqid)
4537 {
4538         struct nfs4_unlockdata *p;
4539         struct inode *inode = lsp->ls_state->inode;
4540
4541         p = kzalloc(sizeof(*p), GFP_NOFS);
4542         if (p == NULL)
4543                 return NULL;
4544         p->arg.fh = NFS_FH(inode);
4545         p->arg.fl = &p->fl;
4546         p->arg.seqid = seqid;
4547         p->res.seqid = seqid;
4548         p->arg.stateid = &lsp->ls_stateid;
4549         p->lsp = lsp;
4550         atomic_inc(&lsp->ls_count);
4551         /* Ensure we don't close file until we're done freeing locks! */
4552         p->ctx = get_nfs_open_context(ctx);
4553         memcpy(&p->fl, fl, sizeof(p->fl));
4554         p->server = NFS_SERVER(inode);
4555         return p;
4556 }
4557
4558 static void nfs4_locku_release_calldata(void *data)
4559 {
4560         struct nfs4_unlockdata *calldata = data;
4561         nfs_free_seqid(calldata->arg.seqid);
4562         nfs4_put_lock_state(calldata->lsp);
4563         put_nfs_open_context(calldata->ctx);
4564         kfree(calldata);
4565 }
4566
4567 static void nfs4_locku_done(struct rpc_task *task, void *data)
4568 {
4569         struct nfs4_unlockdata *calldata = data;
4570
4571         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4572                 return;
4573         switch (task->tk_status) {
4574                 case 0:
4575                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4576                                         &calldata->res.stateid);
4577                         renew_lease(calldata->server, calldata->timestamp);
4578                         break;
4579                 case -NFS4ERR_BAD_STATEID:
4580                 case -NFS4ERR_OLD_STATEID:
4581                 case -NFS4ERR_STALE_STATEID:
4582                 case -NFS4ERR_EXPIRED:
4583                         break;
4584                 default:
4585                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4586                                 rpc_restart_call_prepare(task);
4587         }
4588         nfs_release_seqid(calldata->arg.seqid);
4589 }
4590
4591 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4592 {
4593         struct nfs4_unlockdata *calldata = data;
4594
4595         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4596                 return;
4597         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4598                 /* Note: exit _without_ running nfs4_locku_done */
4599                 task->tk_action = NULL;
4600                 return;
4601         }
4602         calldata->timestamp = jiffies;
4603         if (nfs4_setup_sequence(calldata->server,
4604                                 &calldata->arg.seq_args,
4605                                 &calldata->res.seq_res,
4606                                 task) != 0)
4607                 nfs_release_seqid(calldata->arg.seqid);
4608         else
4609                 rpc_call_start(task);
4610 }
4611
4612 static const struct rpc_call_ops nfs4_locku_ops = {
4613         .rpc_call_prepare = nfs4_locku_prepare,
4614         .rpc_call_done = nfs4_locku_done,
4615         .rpc_release = nfs4_locku_release_calldata,
4616 };
4617
4618 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4619                 struct nfs_open_context *ctx,
4620                 struct nfs4_lock_state *lsp,
4621                 struct nfs_seqid *seqid)
4622 {
4623         struct nfs4_unlockdata *data;
4624         struct rpc_message msg = {
4625                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4626                 .rpc_cred = ctx->cred,
4627         };
4628         struct rpc_task_setup task_setup_data = {
4629                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4630                 .rpc_message = &msg,
4631                 .callback_ops = &nfs4_locku_ops,
4632                 .workqueue = nfsiod_workqueue,
4633                 .flags = RPC_TASK_ASYNC,
4634         };
4635
4636         /* Ensure this is an unlock - when canceling a lock, the
4637          * canceled lock is passed in, and it won't be an unlock.
4638          */
4639         fl->fl_type = F_UNLCK;
4640
4641         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4642         if (data == NULL) {
4643                 nfs_free_seqid(seqid);
4644                 return ERR_PTR(-ENOMEM);
4645         }
4646
4647         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4648         msg.rpc_argp = &data->arg;
4649         msg.rpc_resp = &data->res;
4650         task_setup_data.callback_data = data;
4651         return rpc_run_task(&task_setup_data);
4652 }
4653
4654 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4655 {
4656         struct nfs_inode *nfsi = NFS_I(state->inode);
4657         struct nfs_seqid *seqid;
4658         struct nfs4_lock_state *lsp;
4659         struct rpc_task *task;
4660         int status = 0;
4661         unsigned char fl_flags = request->fl_flags;
4662
4663         status = nfs4_set_lock_state(state, request);
4664         /* Unlock _before_ we do the RPC call */
4665         request->fl_flags |= FL_EXISTS;
4666         down_read(&nfsi->rwsem);
4667         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4668                 up_read(&nfsi->rwsem);
4669                 goto out;
4670         }
4671         up_read(&nfsi->rwsem);
4672         if (status != 0)
4673                 goto out;
4674         /* Is this a delegated lock? */
4675         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4676                 goto out;
4677         lsp = request->fl_u.nfs4_fl.owner;
4678         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4679         status = -ENOMEM;
4680         if (seqid == NULL)
4681                 goto out;
4682         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4683         status = PTR_ERR(task);
4684         if (IS_ERR(task))
4685                 goto out;
4686         status = nfs4_wait_for_completion_rpc_task(task);
4687         rpc_put_task(task);
4688 out:
4689         request->fl_flags = fl_flags;
4690         return status;
4691 }
4692
4693 struct nfs4_lockdata {
4694         struct nfs_lock_args arg;
4695         struct nfs_lock_res res;
4696         struct nfs4_lock_state *lsp;
4697         struct nfs_open_context *ctx;
4698         struct file_lock fl;
4699         unsigned long timestamp;
4700         int rpc_status;
4701         int cancelled;
4702         struct nfs_server *server;
4703 };
4704
4705 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4706                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4707                 gfp_t gfp_mask)
4708 {
4709         struct nfs4_lockdata *p;
4710         struct inode *inode = lsp->ls_state->inode;
4711         struct nfs_server *server = NFS_SERVER(inode);
4712
4713         p = kzalloc(sizeof(*p), gfp_mask);
4714         if (p == NULL)
4715                 return NULL;
4716
4717         p->arg.fh = NFS_FH(inode);
4718         p->arg.fl = &p->fl;
4719         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4720         if (p->arg.open_seqid == NULL)
4721                 goto out_free;
4722         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4723         if (p->arg.lock_seqid == NULL)
4724                 goto out_free_seqid;
4725         p->arg.lock_stateid = &lsp->ls_stateid;
4726         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4727         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4728         p->arg.lock_owner.s_dev = server->s_dev;
4729         p->res.lock_seqid = p->arg.lock_seqid;
4730         p->lsp = lsp;
4731         p->server = server;
4732         atomic_inc(&lsp->ls_count);
4733         p->ctx = get_nfs_open_context(ctx);
4734         memcpy(&p->fl, fl, sizeof(p->fl));
4735         return p;
4736 out_free_seqid:
4737         nfs_free_seqid(p->arg.open_seqid);
4738 out_free:
4739         kfree(p);
4740         return NULL;
4741 }
4742
4743 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4744 {
4745         struct nfs4_lockdata *data = calldata;
4746         struct nfs4_state *state = data->lsp->ls_state;
4747
4748         dprintk("%s: begin!\n", __func__);
4749         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4750                 return;
4751         /* Do we need to do an open_to_lock_owner? */
4752         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4753                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4754                         goto out_release_lock_seqid;
4755                 data->arg.open_stateid = &state->stateid;
4756                 data->arg.new_lock_owner = 1;
4757                 data->res.open_seqid = data->arg.open_seqid;
4758         } else
4759                 data->arg.new_lock_owner = 0;
4760         data->timestamp = jiffies;
4761         if (nfs4_setup_sequence(data->server,
4762                                 &data->arg.seq_args,
4763                                 &data->res.seq_res,
4764                                 task) == 0) {
4765                 rpc_call_start(task);
4766                 return;
4767         }
4768         nfs_release_seqid(data->arg.open_seqid);
4769 out_release_lock_seqid:
4770         nfs_release_seqid(data->arg.lock_seqid);
4771         dprintk("%s: done!, ret = %d\n", __func__, task->tk_status);
4772 }
4773
4774 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4775 {
4776         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4777         nfs4_lock_prepare(task, calldata);
4778 }
4779
4780 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4781 {
4782         struct nfs4_lockdata *data = calldata;
4783
4784         dprintk("%s: begin!\n", __func__);
4785
4786         if (!nfs4_sequence_done(task, &data->res.seq_res))
4787                 return;
4788
4789         data->rpc_status = task->tk_status;
4790         if (data->arg.new_lock_owner != 0) {
4791                 if (data->rpc_status == 0)
4792                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4793                 else
4794                         goto out;
4795         }
4796         if (data->rpc_status == 0) {
4797                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4798                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4799                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4800         }
4801 out:
4802         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4803 }
4804
4805 static void nfs4_lock_release(void *calldata)
4806 {
4807         struct nfs4_lockdata *data = calldata;
4808
4809         dprintk("%s: begin!\n", __func__);
4810         nfs_free_seqid(data->arg.open_seqid);
4811         if (data->cancelled != 0) {
4812                 struct rpc_task *task;
4813                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4814                                 data->arg.lock_seqid);
4815                 if (!IS_ERR(task))
4816                         rpc_put_task_async(task);
4817                 dprintk("%s: cancelling lock!\n", __func__);
4818         } else
4819                 nfs_free_seqid(data->arg.lock_seqid);
4820         nfs4_put_lock_state(data->lsp);
4821         put_nfs_open_context(data->ctx);
4822         kfree(data);
4823         dprintk("%s: done!\n", __func__);
4824 }
4825
4826 static const struct rpc_call_ops nfs4_lock_ops = {
4827         .rpc_call_prepare = nfs4_lock_prepare,
4828         .rpc_call_done = nfs4_lock_done,
4829         .rpc_release = nfs4_lock_release,
4830 };
4831
4832 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4833         .rpc_call_prepare = nfs4_recover_lock_prepare,
4834         .rpc_call_done = nfs4_lock_done,
4835         .rpc_release = nfs4_lock_release,
4836 };
4837
4838 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4839 {
4840         switch (error) {
4841         case -NFS4ERR_ADMIN_REVOKED:
4842         case -NFS4ERR_BAD_STATEID:
4843                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4844                 if (new_lock_owner != 0 ||
4845                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4846                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4847                 break;
4848         case -NFS4ERR_STALE_STATEID:
4849                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4850         case -NFS4ERR_EXPIRED:
4851                 nfs4_schedule_lease_recovery(server->nfs_client);
4852         };
4853 }
4854
4855 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4856 {
4857         struct nfs4_lockdata *data;
4858         struct rpc_task *task;
4859         struct rpc_message msg = {
4860                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4861                 .rpc_cred = state->owner->so_cred,
4862         };
4863         struct rpc_task_setup task_setup_data = {
4864                 .rpc_client = NFS_CLIENT(state->inode),
4865                 .rpc_message = &msg,
4866                 .callback_ops = &nfs4_lock_ops,
4867                 .workqueue = nfsiod_workqueue,
4868                 .flags = RPC_TASK_ASYNC,
4869         };
4870         int ret;
4871
4872         dprintk("%s: begin!\n", __func__);
4873         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4874                         fl->fl_u.nfs4_fl.owner,
4875                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4876         if (data == NULL)
4877                 return -ENOMEM;
4878         if (IS_SETLKW(cmd))
4879                 data->arg.block = 1;
4880         if (recovery_type > NFS_LOCK_NEW) {
4881                 if (recovery_type == NFS_LOCK_RECLAIM)
4882                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4883                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4884         }
4885         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4886         msg.rpc_argp = &data->arg;
4887         msg.rpc_resp = &data->res;
4888         task_setup_data.callback_data = data;
4889         task = rpc_run_task(&task_setup_data);
4890         if (IS_ERR(task))
4891                 return PTR_ERR(task);
4892         ret = nfs4_wait_for_completion_rpc_task(task);
4893         if (ret == 0) {
4894                 ret = data->rpc_status;
4895                 if (ret)
4896                         nfs4_handle_setlk_error(data->server, data->lsp,
4897                                         data->arg.new_lock_owner, ret);
4898         } else
4899                 data->cancelled = 1;
4900         rpc_put_task(task);
4901         dprintk("%s: done, ret = %d!\n", __func__, ret);
4902         return ret;
4903 }
4904
4905 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4906 {
4907         struct nfs_server *server = NFS_SERVER(state->inode);
4908         struct nfs4_exception exception = {
4909                 .inode = state->inode,
4910         };
4911         int err;
4912
4913         do {
4914                 /* Cache the lock if possible... */
4915                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4916                         return 0;
4917                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4918                 if (err != -NFS4ERR_DELAY)
4919                         break;
4920                 nfs4_handle_exception(server, err, &exception);
4921         } while (exception.retry);
4922         return err;
4923 }
4924
4925 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4926 {
4927         struct nfs_server *server = NFS_SERVER(state->inode);
4928         struct nfs4_exception exception = {
4929                 .inode = state->inode,
4930         };
4931         int err;
4932
4933         err = nfs4_set_lock_state(state, request);
4934         if (err != 0)
4935                 return err;
4936         do {
4937                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4938                         return 0;
4939                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4940                 switch (err) {
4941                 default:
4942                         goto out;
4943                 case -NFS4ERR_GRACE:
4944                 case -NFS4ERR_DELAY:
4945                         nfs4_handle_exception(server, err, &exception);
4946                         err = 0;
4947                 }
4948         } while (exception.retry);
4949 out:
4950         return err;
4951 }
4952
4953 #if defined(CONFIG_NFS_V4_1)
4954 /**
4955  * nfs41_check_expired_locks - possibly free a lock stateid
4956  *
4957  * @state: NFSv4 state for an inode
4958  *
4959  * Returns NFS_OK if recovery for this stateid is now finished.
4960  * Otherwise a negative NFS4ERR value is returned.
4961  */
4962 static int nfs41_check_expired_locks(struct nfs4_state *state)
4963 {
4964         int status, ret = -NFS4ERR_BAD_STATEID;
4965         struct nfs4_lock_state *lsp;
4966         struct nfs_server *server = NFS_SERVER(state->inode);
4967
4968         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4969                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4970                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4971                         if (status != NFS_OK) {
4972                                 /* Free the stateid unless the server
4973                                  * informs us the stateid is unrecognized. */
4974                                 if (status != -NFS4ERR_BAD_STATEID)
4975                                         nfs41_free_stateid(server,
4976                                                         &lsp->ls_stateid);
4977                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4978                                 ret = status;
4979                         }
4980                 }
4981         };
4982
4983         return ret;
4984 }
4985
4986 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4987 {
4988         int status = NFS_OK;
4989
4990         if (test_bit(LK_STATE_IN_USE, &state->flags))
4991                 status = nfs41_check_expired_locks(state);
4992         if (status != NFS_OK)
4993                 status = nfs4_lock_expired(state, request);
4994         return status;
4995 }
4996 #endif
4997
4998 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4999 {
5000         struct nfs_inode *nfsi = NFS_I(state->inode);
5001         unsigned char fl_flags = request->fl_flags;
5002         int status = -ENOLCK;
5003
5004         if ((fl_flags & FL_POSIX) &&
5005                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5006                 goto out;
5007         /* Is this a delegated open? */
5008         status = nfs4_set_lock_state(state, request);
5009         if (status != 0)
5010                 goto out;
5011         request->fl_flags |= FL_ACCESS;
5012         status = do_vfs_lock(request->fl_file, request);
5013         if (status < 0)
5014                 goto out;
5015         down_read(&nfsi->rwsem);
5016         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5017                 /* Yes: cache locks! */
5018                 /* ...but avoid races with delegation recall... */
5019                 request->fl_flags = fl_flags & ~FL_SLEEP;
5020                 status = do_vfs_lock(request->fl_file, request);
5021                 goto out_unlock;
5022         }
5023         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5024         if (status != 0)
5025                 goto out_unlock;
5026         /* Note: we always want to sleep here! */
5027         request->fl_flags = fl_flags | FL_SLEEP;
5028         if (do_vfs_lock(request->fl_file, request) < 0)
5029                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5030                         "manager!\n", __func__);
5031 out_unlock:
5032         up_read(&nfsi->rwsem);
5033 out:
5034         request->fl_flags = fl_flags;
5035         return status;
5036 }
5037
5038 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5039 {
5040         struct nfs4_exception exception = {
5041                 .state = state,
5042                 .inode = state->inode,
5043         };
5044         int err;
5045
5046         do {
5047                 err = _nfs4_proc_setlk(state, cmd, request);
5048                 if (err == -NFS4ERR_DENIED)
5049                         err = -EAGAIN;
5050                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5051                                 err, &exception);
5052         } while (exception.retry);
5053         return err;
5054 }
5055
5056 static int
5057 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5058 {
5059         struct nfs_open_context *ctx;
5060         struct nfs4_state *state;
5061         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5062         int status;
5063
5064         /* verify open state */
5065         ctx = nfs_file_open_context(filp);
5066         state = ctx->state;
5067
5068         if (request->fl_start < 0 || request->fl_end < 0)
5069                 return -EINVAL;
5070
5071         if (IS_GETLK(cmd)) {
5072                 if (state != NULL)
5073                         return nfs4_proc_getlk(state, F_GETLK, request);
5074                 return 0;
5075         }
5076
5077         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5078                 return -EINVAL;
5079
5080         if (request->fl_type == F_UNLCK) {
5081                 if (state != NULL)
5082                         return nfs4_proc_unlck(state, cmd, request);
5083                 return 0;
5084         }
5085
5086         if (state == NULL)
5087                 return -ENOLCK;
5088         /*
5089          * Don't rely on the VFS having checked the file open mode,
5090          * since it won't do this for flock() locks.
5091          */
5092         switch (request->fl_type) {
5093         case F_RDLCK:
5094                 if (!(filp->f_mode & FMODE_READ))
5095                         return -EBADF;
5096                 break;
5097         case F_WRLCK:
5098                 if (!(filp->f_mode & FMODE_WRITE))
5099                         return -EBADF;
5100         }
5101
5102         do {
5103                 status = nfs4_proc_setlk(state, cmd, request);
5104                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5105                         break;
5106                 timeout = nfs4_set_lock_task_retry(timeout);
5107                 status = -ERESTARTSYS;
5108                 if (signalled())
5109                         break;
5110         } while(status < 0);
5111         return status;
5112 }
5113
5114 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
5115 {
5116         struct nfs_server *server = NFS_SERVER(state->inode);
5117         struct nfs4_exception exception = { };
5118         int err;
5119
5120         err = nfs4_set_lock_state(state, fl);
5121         if (err != 0)
5122                 goto out;
5123         do {
5124                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5125                 switch (err) {
5126                         default:
5127                                 printk(KERN_ERR "NFS: %s: unhandled error "
5128                                         "%d.\n", __func__, err);
5129                         case 0:
5130                         case -ESTALE:
5131                                 goto out;
5132                         case -NFS4ERR_EXPIRED:
5133                                 nfs4_schedule_stateid_recovery(server, state);
5134                         case -NFS4ERR_STALE_CLIENTID:
5135                         case -NFS4ERR_STALE_STATEID:
5136                                 nfs4_schedule_lease_recovery(server->nfs_client);
5137                                 goto out;
5138                         case -NFS4ERR_BADSESSION:
5139                         case -NFS4ERR_BADSLOT:
5140                         case -NFS4ERR_BAD_HIGH_SLOT:
5141                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
5142                         case -NFS4ERR_DEADSESSION:
5143                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
5144                                 goto out;
5145                         case -ERESTARTSYS:
5146                                 /*
5147                                  * The show must go on: exit, but mark the
5148                                  * stateid as needing recovery.
5149                                  */
5150                         case -NFS4ERR_DELEG_REVOKED:
5151                         case -NFS4ERR_ADMIN_REVOKED:
5152                         case -NFS4ERR_BAD_STATEID:
5153                         case -NFS4ERR_OPENMODE:
5154                                 nfs4_schedule_stateid_recovery(server, state);
5155                                 err = 0;
5156                                 goto out;
5157                         case -EKEYEXPIRED:
5158                                 /*
5159                                  * User RPCSEC_GSS context has expired.
5160                                  * We cannot recover this stateid now, so
5161                                  * skip it and allow recovery thread to
5162                                  * proceed.
5163                                  */
5164                                 err = 0;
5165                                 goto out;
5166                         case -ENOMEM:
5167                         case -NFS4ERR_DENIED:
5168                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
5169                                 err = 0;
5170                                 goto out;
5171                         case -NFS4ERR_DELAY:
5172                                 break;
5173                 }
5174                 err = nfs4_handle_exception(server, err, &exception);
5175         } while (exception.retry);
5176 out:
5177         return err;
5178 }
5179
5180 struct nfs_release_lockowner_data {
5181         struct nfs4_lock_state *lsp;
5182         struct nfs_server *server;
5183         struct nfs_release_lockowner_args args;
5184 };
5185
5186 static void nfs4_release_lockowner_release(void *calldata)
5187 {
5188         struct nfs_release_lockowner_data *data = calldata;
5189         nfs4_free_lock_state(data->server, data->lsp);
5190         kfree(calldata);
5191 }
5192
5193 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5194         .rpc_release = nfs4_release_lockowner_release,
5195 };
5196
5197 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5198 {
5199         struct nfs_server *server = lsp->ls_state->owner->so_server;
5200         struct nfs_release_lockowner_data *data;
5201         struct rpc_message msg = {
5202                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5203         };
5204
5205         if (server->nfs_client->cl_mvops->minor_version != 0)
5206                 return -EINVAL;
5207         data = kmalloc(sizeof(*data), GFP_NOFS);
5208         if (!data)
5209                 return -ENOMEM;
5210         data->lsp = lsp;
5211         data->server = server;
5212         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5213         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5214         data->args.lock_owner.s_dev = server->s_dev;
5215         msg.rpc_argp = &data->args;
5216         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5217         return 0;
5218 }
5219
5220 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5221
5222 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5223                                    const void *buf, size_t buflen,
5224                                    int flags, int type)
5225 {
5226         if (strcmp(key, "") != 0)
5227                 return -EINVAL;
5228
5229         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5230 }
5231
5232 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5233                                    void *buf, size_t buflen, int type)
5234 {
5235         if (strcmp(key, "") != 0)
5236                 return -EINVAL;
5237
5238         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5239 }
5240
5241 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5242                                        size_t list_len, const char *name,
5243                                        size_t name_len, int type)
5244 {
5245         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5246
5247         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5248                 return 0;
5249
5250         if (list && len <= list_len)
5251                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5252         return len;
5253 }
5254
5255 /*
5256  * nfs_fhget will use either the mounted_on_fileid or the fileid
5257  */
5258 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5259 {
5260         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5261                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5262               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5263               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5264                 return;
5265
5266         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5267                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5268         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5269         fattr->nlink = 2;
5270 }
5271
5272 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5273                                    const struct qstr *name,
5274                                    struct nfs4_fs_locations *fs_locations,
5275                                    struct page *page)
5276 {
5277         struct nfs_server *server = NFS_SERVER(dir);
5278         u32 bitmask[2] = {
5279                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5280         };
5281         struct nfs4_fs_locations_arg args = {
5282                 .dir_fh = NFS_FH(dir),
5283                 .name = name,
5284                 .page = page,
5285                 .bitmask = bitmask,
5286         };
5287         struct nfs4_fs_locations_res res = {
5288                 .fs_locations = fs_locations,
5289         };
5290         struct rpc_message msg = {
5291                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5292                 .rpc_argp = &args,
5293                 .rpc_resp = &res,
5294         };
5295         int status;
5296
5297         dprintk("%s: start\n", __func__);
5298
5299         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5300          * is not supported */
5301         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5302                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5303         else
5304                 bitmask[0] |= FATTR4_WORD0_FILEID;
5305
5306         nfs_fattr_init(&fs_locations->fattr);
5307         fs_locations->server = server;
5308         fs_locations->nlocations = 0;
5309         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5310         dprintk("%s: returned status = %d\n", __func__, status);
5311         return status;
5312 }
5313
5314 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5315                            const struct qstr *name,
5316                            struct nfs4_fs_locations *fs_locations,
5317                            struct page *page)
5318 {
5319         struct nfs4_exception exception = { };
5320         int err;
5321         do {
5322                 err = nfs4_handle_exception(NFS_SERVER(dir),
5323                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5324                                 &exception);
5325         } while (exception.retry);
5326         return err;
5327 }
5328
5329 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5330 {
5331         int status;
5332         struct nfs4_secinfo_arg args = {
5333                 .dir_fh = NFS_FH(dir),
5334                 .name   = name,
5335         };
5336         struct nfs4_secinfo_res res = {
5337                 .flavors     = flavors,
5338         };
5339         struct rpc_message msg = {
5340                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5341                 .rpc_argp = &args,
5342                 .rpc_resp = &res,
5343         };
5344
5345         dprintk("NFS call  secinfo %s\n", name->name);
5346         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5347         dprintk("NFS reply  secinfo: %d\n", status);
5348         return status;
5349 }
5350
5351 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5352                       struct nfs4_secinfo_flavors *flavors)
5353 {
5354         struct nfs4_exception exception = { };
5355         int err;
5356         do {
5357                 err = nfs4_handle_exception(NFS_SERVER(dir),
5358                                 _nfs4_proc_secinfo(dir, name, flavors),
5359                                 &exception);
5360         } while (exception.retry);
5361         return err;
5362 }
5363
5364 #ifdef CONFIG_NFS_V4_1
5365 /*
5366  * Check the exchange flags returned by the server for invalid flags, having
5367  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5368  * DS flags set.
5369  */
5370 static int nfs4_check_cl_exchange_flags(u32 flags)
5371 {
5372         if (flags & ~EXCHGID4_FLAG_MASK_R)
5373                 goto out_inval;
5374         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5375             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5376                 goto out_inval;
5377         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5378                 goto out_inval;
5379         return NFS_OK;
5380 out_inval:
5381         return -NFS4ERR_INVAL;
5382 }
5383
5384 static bool
5385 nfs41_same_server_scope(struct nfs41_server_scope *a,
5386                         struct nfs41_server_scope *b)
5387 {
5388         if (a->server_scope_sz == b->server_scope_sz &&
5389             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5390                 return true;
5391
5392         return false;
5393 }
5394
5395 /*
5396  * nfs4_proc_bind_conn_to_session()
5397  *
5398  * The 4.1 client currently uses the same TCP connection for the
5399  * fore and backchannel.
5400  */
5401 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5402 {
5403         int status;
5404         struct nfs41_bind_conn_to_session_res res;
5405         struct rpc_message msg = {
5406                 .rpc_proc =
5407                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5408                 .rpc_argp = clp,
5409                 .rpc_resp = &res,
5410                 .rpc_cred = cred,
5411         };
5412
5413         dprintk("--> %s\n", __func__);
5414
5415         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5416         if (unlikely(res.session == NULL)) {
5417                 status = -ENOMEM;
5418                 goto out;
5419         }
5420
5421         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5422         if (status == 0) {
5423                 if (memcmp(res.session->sess_id.data,
5424                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5425                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5426                         status = -EIO;
5427                         goto out_session;
5428                 }
5429                 if (res.dir != NFS4_CDFS4_BOTH) {
5430                         dprintk("NFS: %s: Unexpected direction from server\n",
5431                                 __func__);
5432                         status = -EIO;
5433                         goto out_session;
5434                 }
5435                 if (res.use_conn_in_rdma_mode) {
5436                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5437                                 __func__);
5438                         status = -EIO;
5439                         goto out_session;
5440                 }
5441         }
5442 out_session:
5443         kfree(res.session);
5444 out:
5445         dprintk("<-- %s status= %d\n", __func__, status);
5446         return status;
5447 }
5448
5449 /*
5450  * nfs4_proc_exchange_id()
5451  *
5452  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5453  *
5454  * Since the clientid has expired, all compounds using sessions
5455  * associated with the stale clientid will be returning
5456  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5457  * be in some phase of session reset.
5458  */
5459 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5460 {
5461         nfs4_verifier verifier;
5462         struct nfs41_exchange_id_args args = {
5463                 .verifier = &verifier,
5464                 .client = clp,
5465                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5466         };
5467         struct nfs41_exchange_id_res res = {
5468                 0
5469         };
5470         int status;
5471         struct rpc_message msg = {
5472                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5473                 .rpc_argp = &args,
5474                 .rpc_resp = &res,
5475                 .rpc_cred = cred,
5476         };
5477
5478         nfs4_init_boot_verifier(clp, &verifier);
5479         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5480                                                         sizeof(args.id));
5481         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5482                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5483                 args.id_len, args.id);
5484
5485         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5486                                         GFP_NOFS);
5487         if (unlikely(res.server_owner == NULL)) {
5488                 status = -ENOMEM;
5489                 goto out;
5490         }
5491
5492         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5493                                         GFP_NOFS);
5494         if (unlikely(res.server_scope == NULL)) {
5495                 status = -ENOMEM;
5496                 goto out_server_owner;
5497         }
5498
5499         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5500         if (unlikely(res.impl_id == NULL)) {
5501                 status = -ENOMEM;
5502                 goto out_server_scope;
5503         }
5504
5505         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5506         if (status == 0)
5507                 status = nfs4_check_cl_exchange_flags(res.flags);
5508
5509         if (status == 0) {
5510                 clp->cl_clientid = res.clientid;
5511                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5512                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5513                         clp->cl_seqid = res.seqid;
5514
5515                 kfree(clp->cl_serverowner);
5516                 clp->cl_serverowner = res.server_owner;
5517                 res.server_owner = NULL;
5518
5519                 /* use the most recent implementation id */
5520                 kfree(clp->cl_implid);
5521                 clp->cl_implid = res.impl_id;
5522
5523                 if (clp->cl_serverscope != NULL &&
5524                     !nfs41_same_server_scope(clp->cl_serverscope,
5525                                              res.server_scope)) {
5526                         dprintk("%s: server_scope mismatch detected\n",
5527                                 __func__);
5528                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5529                         kfree(clp->cl_serverscope);
5530                         clp->cl_serverscope = NULL;
5531                 }
5532
5533                 if (clp->cl_serverscope == NULL) {
5534                         clp->cl_serverscope = res.server_scope;
5535                         goto out;
5536                 }
5537         } else
5538                 kfree(res.impl_id);
5539
5540 out_server_owner:
5541         kfree(res.server_owner);
5542 out_server_scope:
5543         kfree(res.server_scope);
5544 out:
5545         if (clp->cl_implid != NULL)
5546                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5547                         "domain: %s, name: %s, date: %llu,%u\n",
5548                         clp->cl_implid->domain, clp->cl_implid->name,
5549                         clp->cl_implid->date.seconds,
5550                         clp->cl_implid->date.nseconds);
5551         dprintk("NFS reply exchange_id: %d\n", status);
5552         return status;
5553 }
5554
5555 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5556                 struct rpc_cred *cred)
5557 {
5558         struct rpc_message msg = {
5559                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5560                 .rpc_argp = clp,
5561                 .rpc_cred = cred,
5562         };
5563         int status;
5564
5565         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5566         if (status)
5567                 dprintk("NFS: Got error %d from the server %s on "
5568                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5569         return status;
5570 }
5571
5572 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5573                 struct rpc_cred *cred)
5574 {
5575         unsigned int loop;
5576         int ret;
5577
5578         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5579                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5580                 switch (ret) {
5581                 case -NFS4ERR_DELAY:
5582                 case -NFS4ERR_CLIENTID_BUSY:
5583                         ssleep(1);
5584                         break;
5585                 default:
5586                         return ret;
5587                 }
5588         }
5589         return 0;
5590 }
5591
5592 int nfs4_destroy_clientid(struct nfs_client *clp)
5593 {
5594         struct rpc_cred *cred;
5595         int ret = 0;
5596
5597         if (clp->cl_mvops->minor_version < 1)
5598                 goto out;
5599         if (clp->cl_exchange_flags == 0)
5600                 goto out;
5601         if (clp->cl_preserve_clid)
5602                 goto out;
5603         cred = nfs4_get_exchange_id_cred(clp);
5604         ret = nfs4_proc_destroy_clientid(clp, cred);
5605         if (cred)
5606                 put_rpccred(cred);
5607         switch (ret) {
5608         case 0:
5609         case -NFS4ERR_STALE_CLIENTID:
5610                 clp->cl_exchange_flags = 0;
5611         }
5612 out:
5613         return ret;
5614 }
5615
5616 struct nfs4_get_lease_time_data {
5617         struct nfs4_get_lease_time_args *args;
5618         struct nfs4_get_lease_time_res *res;
5619         struct nfs_client *clp;
5620 };
5621
5622 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5623                                         void *calldata)
5624 {
5625         int ret;
5626         struct nfs4_get_lease_time_data *data =
5627                         (struct nfs4_get_lease_time_data *)calldata;
5628
5629         dprintk("--> %s\n", __func__);
5630         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5631         /* just setup sequence, do not trigger session recovery
5632            since we're invoked within one */
5633         ret = nfs41_setup_sequence(data->clp->cl_session,
5634                                    &data->args->la_seq_args,
5635                                    &data->res->lr_seq_res, task);
5636
5637         if (ret != -EAGAIN)
5638                 rpc_call_start(task);
5639         dprintk("<-- %s\n", __func__);
5640 }
5641
5642 /*
5643  * Called from nfs4_state_manager thread for session setup, so don't recover
5644  * from sequence operation or clientid errors.
5645  */
5646 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5647 {
5648         struct nfs4_get_lease_time_data *data =
5649                         (struct nfs4_get_lease_time_data *)calldata;
5650
5651         dprintk("--> %s\n", __func__);
5652         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5653                 return;
5654         switch (task->tk_status) {
5655         case -NFS4ERR_DELAY:
5656         case -NFS4ERR_GRACE:
5657                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5658                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5659                 task->tk_status = 0;
5660                 /* fall through */
5661         case -NFS4ERR_RETRY_UNCACHED_REP:
5662                 rpc_restart_call_prepare(task);
5663                 return;
5664         }
5665         dprintk("<-- %s\n", __func__);
5666 }
5667
5668 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5669         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5670         .rpc_call_done = nfs4_get_lease_time_done,
5671 };
5672
5673 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5674 {
5675         struct rpc_task *task;
5676         struct nfs4_get_lease_time_args args;
5677         struct nfs4_get_lease_time_res res = {
5678                 .lr_fsinfo = fsinfo,
5679         };
5680         struct nfs4_get_lease_time_data data = {
5681                 .args = &args,
5682                 .res = &res,
5683                 .clp = clp,
5684         };
5685         struct rpc_message msg = {
5686                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5687                 .rpc_argp = &args,
5688                 .rpc_resp = &res,
5689         };
5690         struct rpc_task_setup task_setup = {
5691                 .rpc_client = clp->cl_rpcclient,
5692                 .rpc_message = &msg,
5693                 .callback_ops = &nfs4_get_lease_time_ops,
5694                 .callback_data = &data,
5695                 .flags = RPC_TASK_TIMEOUT,
5696         };
5697         int status;
5698
5699         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5700         dprintk("--> %s\n", __func__);
5701         task = rpc_run_task(&task_setup);
5702
5703         if (IS_ERR(task))
5704                 status = PTR_ERR(task);
5705         else {
5706                 status = task->tk_status;
5707                 rpc_put_task(task);
5708         }
5709         dprintk("<-- %s return %d\n", __func__, status);
5710
5711         return status;
5712 }
5713
5714 struct nfs4_slot *nfs4_alloc_slots(struct nfs4_slot_table *table,
5715                 u32 max_slots, gfp_t gfp_flags)
5716 {
5717         struct nfs4_slot *tbl;
5718         u32 i;
5719
5720         tbl = kmalloc_array(max_slots, sizeof(*tbl), gfp_flags);
5721         if (tbl != NULL) {
5722                 for (i = 0; i < max_slots; i++) {
5723                         tbl[i].table = table;
5724                         tbl[i].slot_nr = i;
5725                 }
5726         }
5727         return tbl;
5728 }
5729
5730 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5731                 struct nfs4_slot *new,
5732                 u32 max_slots,
5733                 u32 ivalue)
5734 {
5735         struct nfs4_slot *old = NULL;
5736         u32 i;
5737
5738         spin_lock(&tbl->slot_tbl_lock);
5739         if (new) {
5740                 old = tbl->slots;
5741                 tbl->slots = new;
5742                 tbl->max_slots = max_slots;
5743         }
5744         tbl->highest_used_slotid = NFS4_NO_SLOT;
5745         tbl->target_highest_slotid = max_slots - 1;
5746         tbl->server_highest_slotid = max_slots - 1;
5747         for (i = 0; i < tbl->max_slots; i++)
5748                 tbl->slots[i].seq_nr = ivalue;
5749         spin_unlock(&tbl->slot_tbl_lock);
5750         kfree(old);
5751 }
5752
5753 /*
5754  * (re)Initialise a slot table
5755  */
5756 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5757                                  u32 ivalue)
5758 {
5759         struct nfs4_slot *new = NULL;
5760         int ret = -ENOMEM;
5761
5762         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5763                 max_reqs, tbl->max_slots);
5764
5765         /* Does the newly negotiated max_reqs match the existing slot table? */
5766         if (max_reqs != tbl->max_slots) {
5767                 new = nfs4_alloc_slots(tbl, max_reqs, GFP_NOFS);
5768                 if (!new)
5769                         goto out;
5770         }
5771         ret = 0;
5772
5773         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5774         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5775                 tbl, tbl->slots, tbl->max_slots);
5776 out:
5777         dprintk("<-- %s: return %d\n", __func__, ret);
5778         return ret;
5779 }
5780
5781 /* Destroy the slot table */
5782 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5783 {
5784         if (session->fc_slot_table.slots != NULL) {
5785                 kfree(session->fc_slot_table.slots);
5786                 session->fc_slot_table.slots = NULL;
5787         }
5788         if (session->bc_slot_table.slots != NULL) {
5789                 kfree(session->bc_slot_table.slots);
5790                 session->bc_slot_table.slots = NULL;
5791         }
5792         return;
5793 }
5794
5795 /*
5796  * Initialize or reset the forechannel and backchannel tables
5797  */
5798 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5799 {
5800         struct nfs4_slot_table *tbl;
5801         int status;
5802
5803         dprintk("--> %s\n", __func__);
5804         /* Fore channel */
5805         tbl = &ses->fc_slot_table;
5806         tbl->session = ses;
5807         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5808         if (status) /* -ENOMEM */
5809                 return status;
5810         /* Back channel */
5811         tbl = &ses->bc_slot_table;
5812         tbl->session = ses;
5813         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5814         if (status && tbl->slots == NULL)
5815                 /* Fore and back channel share a connection so get
5816                  * both slot tables or neither */
5817                 nfs4_destroy_slot_tables(ses);
5818         return status;
5819 }
5820
5821 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5822 {
5823         struct nfs4_session *session;
5824         struct nfs4_slot_table *tbl;
5825
5826         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5827         if (!session)
5828                 return NULL;
5829
5830         tbl = &session->fc_slot_table;
5831         tbl->highest_used_slotid = NFS4_NO_SLOT;
5832         spin_lock_init(&tbl->slot_tbl_lock);
5833         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5834         init_completion(&tbl->complete);
5835
5836         tbl = &session->bc_slot_table;
5837         tbl->highest_used_slotid = NFS4_NO_SLOT;
5838         spin_lock_init(&tbl->slot_tbl_lock);
5839         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5840         init_completion(&tbl->complete);
5841
5842         session->session_state = 1<<NFS4_SESSION_INITING;
5843
5844         session->clp = clp;
5845         return session;
5846 }
5847
5848 void nfs4_destroy_session(struct nfs4_session *session)
5849 {
5850         struct rpc_xprt *xprt;
5851         struct rpc_cred *cred;
5852
5853         cred = nfs4_get_exchange_id_cred(session->clp);
5854         nfs4_proc_destroy_session(session, cred);
5855         if (cred)
5856                 put_rpccred(cred);
5857
5858         rcu_read_lock();
5859         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5860         rcu_read_unlock();
5861         dprintk("%s Destroy backchannel for xprt %p\n",
5862                 __func__, xprt);
5863         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5864         nfs4_destroy_slot_tables(session);
5865         kfree(session);
5866 }
5867
5868 /*
5869  * Initialize the values to be used by the client in CREATE_SESSION
5870  * If nfs4_init_session set the fore channel request and response sizes,
5871  * use them.
5872  *
5873  * Set the back channel max_resp_sz_cached to zero to force the client to
5874  * always set csa_cachethis to FALSE because the current implementation
5875  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5876  */
5877 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5878 {
5879         struct nfs4_session *session = args->client->cl_session;
5880         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5881                      mxresp_sz = session->fc_target_max_resp_sz;
5882
5883         if (mxrqst_sz == 0)
5884                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5885         if (mxresp_sz == 0)
5886                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5887         /* Fore channel attributes */
5888         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5889         args->fc_attrs.max_resp_sz = mxresp_sz;
5890         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5891         args->fc_attrs.max_reqs = max_session_slots;
5892
5893         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5894                 "max_ops=%u max_reqs=%u\n",
5895                 __func__,
5896                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5897                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5898
5899         /* Back channel attributes */
5900         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5901         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5902         args->bc_attrs.max_resp_sz_cached = 0;
5903         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5904         args->bc_attrs.max_reqs = 1;
5905
5906         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5907                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5908                 __func__,
5909                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5910                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5911                 args->bc_attrs.max_reqs);
5912 }
5913
5914 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5915 {
5916         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5917         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5918
5919         if (rcvd->max_resp_sz > sent->max_resp_sz)
5920                 return -EINVAL;
5921         /*
5922          * Our requested max_ops is the minimum we need; we're not
5923          * prepared to break up compounds into smaller pieces than that.
5924          * So, no point even trying to continue if the server won't
5925          * cooperate:
5926          */
5927         if (rcvd->max_ops < sent->max_ops)
5928                 return -EINVAL;
5929         if (rcvd->max_reqs == 0)
5930                 return -EINVAL;
5931         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5932                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5933         return 0;
5934 }
5935
5936 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5937 {
5938         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5939         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5940
5941         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5942                 return -EINVAL;
5943         if (rcvd->max_resp_sz < sent->max_resp_sz)
5944                 return -EINVAL;
5945         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5946                 return -EINVAL;
5947         /* These would render the backchannel useless: */
5948         if (rcvd->max_ops != sent->max_ops)
5949                 return -EINVAL;
5950         if (rcvd->max_reqs != sent->max_reqs)
5951                 return -EINVAL;
5952         return 0;
5953 }
5954
5955 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5956                                      struct nfs4_session *session)
5957 {
5958         int ret;
5959
5960         ret = nfs4_verify_fore_channel_attrs(args, session);
5961         if (ret)
5962                 return ret;
5963         return nfs4_verify_back_channel_attrs(args, session);
5964 }
5965
5966 static int _nfs4_proc_create_session(struct nfs_client *clp,
5967                 struct rpc_cred *cred)
5968 {
5969         struct nfs4_session *session = clp->cl_session;
5970         struct nfs41_create_session_args args = {
5971                 .client = clp,
5972                 .cb_program = NFS4_CALLBACK,
5973         };
5974         struct nfs41_create_session_res res = {
5975                 .client = clp,
5976         };
5977         struct rpc_message msg = {
5978                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5979                 .rpc_argp = &args,
5980                 .rpc_resp = &res,
5981                 .rpc_cred = cred,
5982         };
5983         int status;
5984
5985         nfs4_init_channel_attrs(&args);
5986         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5987
5988         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5989
5990         if (!status) {
5991                 /* Verify the session's negotiated channel_attrs values */
5992                 status = nfs4_verify_channel_attrs(&args, session);
5993                 /* Increment the clientid slot sequence id */
5994                 clp->cl_seqid++;
5995         }
5996
5997         return status;
5998 }
5999
6000 /*
6001  * Issues a CREATE_SESSION operation to the server.
6002  * It is the responsibility of the caller to verify the session is
6003  * expired before calling this routine.
6004  */
6005 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
6006 {
6007         int status;
6008         unsigned *ptr;
6009         struct nfs4_session *session = clp->cl_session;
6010
6011         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
6012
6013         status = _nfs4_proc_create_session(clp, cred);
6014         if (status)
6015                 goto out;
6016
6017         /* Init or reset the session slot tables */
6018         status = nfs4_setup_session_slot_tables(session);
6019         dprintk("slot table setup returned %d\n", status);
6020         if (status)
6021                 goto out;
6022
6023         ptr = (unsigned *)&session->sess_id.data[0];
6024         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
6025                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
6026 out:
6027         dprintk("<-- %s\n", __func__);
6028         return status;
6029 }
6030
6031 /*
6032  * Issue the over-the-wire RPC DESTROY_SESSION.
6033  * The caller must serialize access to this routine.
6034  */
6035 int nfs4_proc_destroy_session(struct nfs4_session *session,
6036                 struct rpc_cred *cred)
6037 {
6038         struct rpc_message msg = {
6039                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
6040                 .rpc_argp = session,
6041                 .rpc_cred = cred,
6042         };
6043         int status = 0;
6044
6045         dprintk("--> nfs4_proc_destroy_session\n");
6046
6047         /* session is still being setup */
6048         if (session->clp->cl_cons_state != NFS_CS_READY)
6049                 return status;
6050
6051         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6052
6053         if (status)
6054                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
6055                         "Session has been destroyed regardless...\n", status);
6056
6057         dprintk("<-- nfs4_proc_destroy_session\n");
6058         return status;
6059 }
6060
6061 /*
6062  * With sessions, the client is not marked ready until after a
6063  * successful EXCHANGE_ID and CREATE_SESSION.
6064  *
6065  * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
6066  * other versions of NFS can be tried.
6067  */
6068 static int nfs41_check_session_ready(struct nfs_client *clp)
6069 {
6070         int ret;
6071
6072         if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
6073                 ret = nfs4_client_recover_expired_lease(clp);
6074                 if (ret)
6075                         return ret;
6076         }
6077         if (clp->cl_cons_state < NFS_CS_READY)
6078                 return -EPROTONOSUPPORT;
6079         smp_rmb();
6080         return 0;
6081 }
6082
6083 int nfs4_init_session(struct nfs_server *server)
6084 {
6085         struct nfs_client *clp = server->nfs_client;
6086         struct nfs4_session *session;
6087         unsigned int target_max_rqst_sz = NFS_MAX_FILE_IO_SIZE;
6088         unsigned int target_max_resp_sz = NFS_MAX_FILE_IO_SIZE;
6089
6090         if (!nfs4_has_session(clp))
6091                 return 0;
6092
6093         if (server->rsize != 0)
6094                 target_max_resp_sz = server->rsize;
6095         target_max_resp_sz += nfs41_maxread_overhead;
6096
6097         if (server->wsize != 0)
6098                 target_max_rqst_sz = server->wsize;
6099         target_max_rqst_sz += nfs41_maxwrite_overhead;
6100
6101         session = clp->cl_session;
6102         spin_lock(&clp->cl_lock);
6103         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
6104                 /* Initialise targets and channel attributes */
6105                 session->fc_target_max_rqst_sz = target_max_rqst_sz;
6106                 session->fc_attrs.max_rqst_sz = target_max_rqst_sz;
6107                 session->fc_target_max_resp_sz = target_max_resp_sz;
6108                 session->fc_attrs.max_resp_sz = target_max_resp_sz;
6109         } else {
6110                 /* Just adjust the targets */
6111                 if (target_max_rqst_sz > session->fc_target_max_rqst_sz) {
6112                         session->fc_target_max_rqst_sz = target_max_rqst_sz;
6113                         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
6114                 }
6115                 if (target_max_resp_sz > session->fc_target_max_resp_sz) {
6116                         session->fc_target_max_resp_sz = target_max_resp_sz;
6117                         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
6118                 }
6119         }
6120         spin_unlock(&clp->cl_lock);
6121
6122         if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
6123                 nfs4_schedule_lease_recovery(clp);
6124
6125         return nfs41_check_session_ready(clp);
6126 }
6127
6128 int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time)
6129 {
6130         struct nfs4_session *session = clp->cl_session;
6131         int ret;
6132
6133         spin_lock(&clp->cl_lock);
6134         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
6135                 /*
6136                  * Do not set NFS_CS_CHECK_LEASE_TIME instead set the
6137                  * DS lease to be equal to the MDS lease.
6138                  */
6139                 clp->cl_lease_time = lease_time;
6140                 clp->cl_last_renewal = jiffies;
6141         }
6142         spin_unlock(&clp->cl_lock);
6143
6144         ret = nfs41_check_session_ready(clp);
6145         if (ret)
6146                 return ret;
6147         /* Test for the DS role */
6148         if (!is_ds_client(clp))
6149                 return -ENODEV;
6150         return 0;
6151 }
6152 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
6153
6154
6155 /*
6156  * Renew the cl_session lease.
6157  */
6158 struct nfs4_sequence_data {
6159         struct nfs_client *clp;
6160         struct nfs4_sequence_args args;
6161         struct nfs4_sequence_res res;
6162 };
6163
6164 static void nfs41_sequence_release(void *data)
6165 {
6166         struct nfs4_sequence_data *calldata = data;
6167         struct nfs_client *clp = calldata->clp;
6168
6169         if (atomic_read(&clp->cl_count) > 1)
6170                 nfs4_schedule_state_renewal(clp);
6171         nfs_put_client(clp);
6172         kfree(calldata);
6173 }
6174
6175 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6176 {
6177         switch(task->tk_status) {
6178         case -NFS4ERR_DELAY:
6179                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6180                 return -EAGAIN;
6181         default:
6182                 nfs4_schedule_lease_recovery(clp);
6183         }
6184         return 0;
6185 }
6186
6187 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6188 {
6189         struct nfs4_sequence_data *calldata = data;
6190         struct nfs_client *clp = calldata->clp;
6191
6192         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6193                 return;
6194
6195         if (task->tk_status < 0) {
6196                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6197                 if (atomic_read(&clp->cl_count) == 1)
6198                         goto out;
6199
6200                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6201                         rpc_restart_call_prepare(task);
6202                         return;
6203                 }
6204         }
6205         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6206 out:
6207         dprintk("<-- %s\n", __func__);
6208 }
6209
6210 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6211 {
6212         struct nfs4_sequence_data *calldata = data;
6213         struct nfs_client *clp = calldata->clp;
6214         struct nfs4_sequence_args *args;
6215         struct nfs4_sequence_res *res;
6216
6217         args = task->tk_msg.rpc_argp;
6218         res = task->tk_msg.rpc_resp;
6219
6220         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
6221                 return;
6222         rpc_call_start(task);
6223 }
6224
6225 static void nfs41_sequence_prepare_privileged(struct rpc_task *task, void *data)
6226 {
6227         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
6228         nfs41_sequence_prepare(task, data);
6229 }
6230
6231 static const struct rpc_call_ops nfs41_sequence_ops = {
6232         .rpc_call_done = nfs41_sequence_call_done,
6233         .rpc_call_prepare = nfs41_sequence_prepare,
6234         .rpc_release = nfs41_sequence_release,
6235 };
6236
6237 static const struct rpc_call_ops nfs41_sequence_privileged_ops = {
6238         .rpc_call_done = nfs41_sequence_call_done,
6239         .rpc_call_prepare = nfs41_sequence_prepare_privileged,
6240         .rpc_release = nfs41_sequence_release,
6241 };
6242
6243 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred,
6244                                              const struct rpc_call_ops *seq_ops)
6245 {
6246         struct nfs4_sequence_data *calldata;
6247         struct rpc_message msg = {
6248                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6249                 .rpc_cred = cred,
6250         };
6251         struct rpc_task_setup task_setup_data = {
6252                 .rpc_client = clp->cl_rpcclient,
6253                 .rpc_message = &msg,
6254                 .callback_ops = seq_ops,
6255                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
6256         };
6257
6258         if (!atomic_inc_not_zero(&clp->cl_count))
6259                 return ERR_PTR(-EIO);
6260         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6261         if (calldata == NULL) {
6262                 nfs_put_client(clp);
6263                 return ERR_PTR(-ENOMEM);
6264         }
6265         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
6266         msg.rpc_argp = &calldata->args;
6267         msg.rpc_resp = &calldata->res;
6268         calldata->clp = clp;
6269         task_setup_data.callback_data = calldata;
6270
6271         return rpc_run_task(&task_setup_data);
6272 }
6273
6274 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6275 {
6276         struct rpc_task *task;
6277         int ret = 0;
6278
6279         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6280                 return 0;
6281         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_ops);
6282         if (IS_ERR(task))
6283                 ret = PTR_ERR(task);
6284         else
6285                 rpc_put_task_async(task);
6286         dprintk("<-- %s status=%d\n", __func__, ret);
6287         return ret;
6288 }
6289
6290 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6291 {
6292         struct rpc_task *task;
6293         int ret;
6294
6295         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_privileged_ops);
6296         if (IS_ERR(task)) {
6297                 ret = PTR_ERR(task);
6298                 goto out;
6299         }
6300         ret = rpc_wait_for_completion_task(task);
6301         if (!ret) {
6302                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6303
6304                 if (task->tk_status == 0)
6305                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6306                 ret = task->tk_status;
6307         }
6308         rpc_put_task(task);
6309 out:
6310         dprintk("<-- %s status=%d\n", __func__, ret);
6311         return ret;
6312 }
6313
6314 struct nfs4_reclaim_complete_data {
6315         struct nfs_client *clp;
6316         struct nfs41_reclaim_complete_args arg;
6317         struct nfs41_reclaim_complete_res res;
6318 };
6319
6320 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6321 {
6322         struct nfs4_reclaim_complete_data *calldata = data;
6323
6324         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
6325         if (nfs41_setup_sequence(calldata->clp->cl_session,
6326                                 &calldata->arg.seq_args,
6327                                 &calldata->res.seq_res, task))
6328                 return;
6329
6330         rpc_call_start(task);
6331 }
6332
6333 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6334 {
6335         switch(task->tk_status) {
6336         case 0:
6337         case -NFS4ERR_COMPLETE_ALREADY:
6338         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6339                 break;
6340         case -NFS4ERR_DELAY:
6341                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6342                 /* fall through */
6343         case -NFS4ERR_RETRY_UNCACHED_REP:
6344                 return -EAGAIN;
6345         default:
6346                 nfs4_schedule_lease_recovery(clp);
6347         }
6348         return 0;
6349 }
6350
6351 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6352 {
6353         struct nfs4_reclaim_complete_data *calldata = data;
6354         struct nfs_client *clp = calldata->clp;
6355         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6356
6357         dprintk("--> %s\n", __func__);
6358         if (!nfs41_sequence_done(task, res))
6359                 return;
6360
6361         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6362                 rpc_restart_call_prepare(task);
6363                 return;
6364         }
6365         dprintk("<-- %s\n", __func__);
6366 }
6367
6368 static void nfs4_free_reclaim_complete_data(void *data)
6369 {
6370         struct nfs4_reclaim_complete_data *calldata = data;
6371
6372         kfree(calldata);
6373 }
6374
6375 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6376         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6377         .rpc_call_done = nfs4_reclaim_complete_done,
6378         .rpc_release = nfs4_free_reclaim_complete_data,
6379 };
6380
6381 /*
6382  * Issue a global reclaim complete.
6383  */
6384 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6385 {
6386         struct nfs4_reclaim_complete_data *calldata;
6387         struct rpc_task *task;
6388         struct rpc_message msg = {
6389                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6390         };
6391         struct rpc_task_setup task_setup_data = {
6392                 .rpc_client = clp->cl_rpcclient,
6393                 .rpc_message = &msg,
6394                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6395                 .flags = RPC_TASK_ASYNC,
6396         };
6397         int status = -ENOMEM;
6398
6399         dprintk("--> %s\n", __func__);
6400         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6401         if (calldata == NULL)
6402                 goto out;
6403         calldata->clp = clp;
6404         calldata->arg.one_fs = 0;
6405
6406         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6407         msg.rpc_argp = &calldata->arg;
6408         msg.rpc_resp = &calldata->res;
6409         task_setup_data.callback_data = calldata;
6410         task = rpc_run_task(&task_setup_data);
6411         if (IS_ERR(task)) {
6412                 status = PTR_ERR(task);
6413                 goto out;
6414         }
6415         status = nfs4_wait_for_completion_rpc_task(task);
6416         if (status == 0)
6417                 status = task->tk_status;
6418         rpc_put_task(task);
6419         return 0;
6420 out:
6421         dprintk("<-- %s status=%d\n", __func__, status);
6422         return status;
6423 }
6424
6425 static void
6426 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6427 {
6428         struct nfs4_layoutget *lgp = calldata;
6429         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6430
6431         dprintk("--> %s\n", __func__);
6432         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6433          * right now covering the LAYOUTGET we are about to send.
6434          * However, that is not so catastrophic, and there seems
6435          * to be no way to prevent it completely.
6436          */
6437         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6438                                 &lgp->res.seq_res, task))
6439                 return;
6440         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6441                                           NFS_I(lgp->args.inode)->layout,
6442                                           lgp->args.ctx->state)) {
6443                 rpc_exit(task, NFS4_OK);
6444                 return;
6445         }
6446         rpc_call_start(task);
6447 }
6448
6449 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6450 {
6451         struct nfs4_layoutget *lgp = calldata;
6452         struct inode *inode = lgp->args.inode;
6453         struct nfs_server *server = NFS_SERVER(inode);
6454         struct pnfs_layout_hdr *lo;
6455         struct nfs4_state *state = NULL;
6456
6457         dprintk("--> %s\n", __func__);
6458
6459         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6460                 goto out;
6461
6462         switch (task->tk_status) {
6463         case 0:
6464                 goto out;
6465         case -NFS4ERR_LAYOUTTRYLATER:
6466         case -NFS4ERR_RECALLCONFLICT:
6467                 task->tk_status = -NFS4ERR_DELAY;
6468                 break;
6469         case -NFS4ERR_EXPIRED:
6470         case -NFS4ERR_BAD_STATEID:
6471                 spin_lock(&inode->i_lock);
6472                 lo = NFS_I(inode)->layout;
6473                 if (!lo || list_empty(&lo->plh_segs)) {
6474                         spin_unlock(&inode->i_lock);
6475                         /* If the open stateid was bad, then recover it. */
6476                         state = lgp->args.ctx->state;
6477                 } else {
6478                         LIST_HEAD(head);
6479
6480                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6481                         spin_unlock(&inode->i_lock);
6482                         /* Mark the bad layout state as invalid, then
6483                          * retry using the open stateid. */
6484                         pnfs_free_lseg_list(&head);
6485                 }
6486         }
6487         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6488                 rpc_restart_call_prepare(task);
6489 out:
6490         dprintk("<-- %s\n", __func__);
6491 }
6492
6493 static size_t max_response_pages(struct nfs_server *server)
6494 {
6495         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6496         return nfs_page_array_len(0, max_resp_sz);
6497 }
6498
6499 static void nfs4_free_pages(struct page **pages, size_t size)
6500 {
6501         int i;
6502
6503         if (!pages)
6504                 return;
6505
6506         for (i = 0; i < size; i++) {
6507                 if (!pages[i])
6508                         break;
6509                 __free_page(pages[i]);
6510         }
6511         kfree(pages);
6512 }
6513
6514 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6515 {
6516         struct page **pages;
6517         int i;
6518
6519         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6520         if (!pages) {
6521                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6522                 return NULL;
6523         }
6524
6525         for (i = 0; i < size; i++) {
6526                 pages[i] = alloc_page(gfp_flags);
6527                 if (!pages[i]) {
6528                         dprintk("%s: failed to allocate page\n", __func__);
6529                         nfs4_free_pages(pages, size);
6530                         return NULL;
6531                 }
6532         }
6533
6534         return pages;
6535 }
6536
6537 static void nfs4_layoutget_release(void *calldata)
6538 {
6539         struct nfs4_layoutget *lgp = calldata;
6540         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6541         size_t max_pages = max_response_pages(server);
6542
6543         dprintk("--> %s\n", __func__);
6544         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6545         put_nfs_open_context(lgp->args.ctx);
6546         kfree(calldata);
6547         dprintk("<-- %s\n", __func__);
6548 }
6549
6550 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6551         .rpc_call_prepare = nfs4_layoutget_prepare,
6552         .rpc_call_done = nfs4_layoutget_done,
6553         .rpc_release = nfs4_layoutget_release,
6554 };
6555
6556 struct pnfs_layout_segment *
6557 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6558 {
6559         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6560         size_t max_pages = max_response_pages(server);
6561         struct rpc_task *task;
6562         struct rpc_message msg = {
6563                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6564                 .rpc_argp = &lgp->args,
6565                 .rpc_resp = &lgp->res,
6566         };
6567         struct rpc_task_setup task_setup_data = {
6568                 .rpc_client = server->client,
6569                 .rpc_message = &msg,
6570                 .callback_ops = &nfs4_layoutget_call_ops,
6571                 .callback_data = lgp,
6572                 .flags = RPC_TASK_ASYNC,
6573         };
6574         struct pnfs_layout_segment *lseg = NULL;
6575         int status = 0;
6576
6577         dprintk("--> %s\n", __func__);
6578
6579         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6580         if (!lgp->args.layout.pages) {
6581                 nfs4_layoutget_release(lgp);
6582                 return ERR_PTR(-ENOMEM);
6583         }
6584         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6585
6586         lgp->res.layoutp = &lgp->args.layout;
6587         lgp->res.seq_res.sr_slot = NULL;
6588         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6589         task = rpc_run_task(&task_setup_data);
6590         if (IS_ERR(task))
6591                 return ERR_CAST(task);
6592         status = nfs4_wait_for_completion_rpc_task(task);
6593         if (status == 0)
6594                 status = task->tk_status;
6595         if (status == 0)
6596                 lseg = pnfs_layout_process(lgp);
6597         rpc_put_task(task);
6598         dprintk("<-- %s status=%d\n", __func__, status);
6599         if (status)
6600                 return ERR_PTR(status);
6601         return lseg;
6602 }
6603
6604 static void
6605 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6606 {
6607         struct nfs4_layoutreturn *lrp = calldata;
6608
6609         dprintk("--> %s\n", __func__);
6610         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6611                                 &lrp->res.seq_res, task))
6612                 return;
6613         rpc_call_start(task);
6614 }
6615
6616 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6617 {
6618         struct nfs4_layoutreturn *lrp = calldata;
6619         struct nfs_server *server;
6620
6621         dprintk("--> %s\n", __func__);
6622
6623         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6624                 return;
6625
6626         server = NFS_SERVER(lrp->args.inode);
6627         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6628                 rpc_restart_call_prepare(task);
6629                 return;
6630         }
6631         dprintk("<-- %s\n", __func__);
6632 }
6633
6634 static void nfs4_layoutreturn_release(void *calldata)
6635 {
6636         struct nfs4_layoutreturn *lrp = calldata;
6637         struct pnfs_layout_hdr *lo = lrp->args.layout;
6638
6639         dprintk("--> %s\n", __func__);
6640         spin_lock(&lo->plh_inode->i_lock);
6641         if (lrp->res.lrs_present)
6642                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6643         lo->plh_block_lgets--;
6644         spin_unlock(&lo->plh_inode->i_lock);
6645         pnfs_put_layout_hdr(lrp->args.layout);
6646         kfree(calldata);
6647         dprintk("<-- %s\n", __func__);
6648 }
6649
6650 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6651         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6652         .rpc_call_done = nfs4_layoutreturn_done,
6653         .rpc_release = nfs4_layoutreturn_release,
6654 };
6655
6656 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6657 {
6658         struct rpc_task *task;
6659         struct rpc_message msg = {
6660                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6661                 .rpc_argp = &lrp->args,
6662                 .rpc_resp = &lrp->res,
6663         };
6664         struct rpc_task_setup task_setup_data = {
6665                 .rpc_client = lrp->clp->cl_rpcclient,
6666                 .rpc_message = &msg,
6667                 .callback_ops = &nfs4_layoutreturn_call_ops,
6668                 .callback_data = lrp,
6669         };
6670         int status;
6671
6672         dprintk("--> %s\n", __func__);
6673         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6674         task = rpc_run_task(&task_setup_data);
6675         if (IS_ERR(task))
6676                 return PTR_ERR(task);
6677         status = task->tk_status;
6678         dprintk("<-- %s status=%d\n", __func__, status);
6679         rpc_put_task(task);
6680         return status;
6681 }
6682
6683 /*
6684  * Retrieve the list of Data Server devices from the MDS.
6685  */
6686 static int _nfs4_getdevicelist(struct nfs_server *server,
6687                                     const struct nfs_fh *fh,
6688                                     struct pnfs_devicelist *devlist)
6689 {
6690         struct nfs4_getdevicelist_args args = {
6691                 .fh = fh,
6692                 .layoutclass = server->pnfs_curr_ld->id,
6693         };
6694         struct nfs4_getdevicelist_res res = {
6695                 .devlist = devlist,
6696         };
6697         struct rpc_message msg = {
6698                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6699                 .rpc_argp = &args,
6700                 .rpc_resp = &res,
6701         };
6702         int status;
6703
6704         dprintk("--> %s\n", __func__);
6705         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6706                                 &res.seq_res, 0);
6707         dprintk("<-- %s status=%d\n", __func__, status);
6708         return status;
6709 }
6710
6711 int nfs4_proc_getdevicelist(struct nfs_server *server,
6712                             const struct nfs_fh *fh,
6713                             struct pnfs_devicelist *devlist)
6714 {
6715         struct nfs4_exception exception = { };
6716         int err;
6717
6718         do {
6719                 err = nfs4_handle_exception(server,
6720                                 _nfs4_getdevicelist(server, fh, devlist),
6721                                 &exception);
6722         } while (exception.retry);
6723
6724         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6725                 err, devlist->num_devs);
6726
6727         return err;
6728 }
6729 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6730
6731 static int
6732 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6733 {
6734         struct nfs4_getdeviceinfo_args args = {
6735                 .pdev = pdev,
6736         };
6737         struct nfs4_getdeviceinfo_res res = {
6738                 .pdev = pdev,
6739         };
6740         struct rpc_message msg = {
6741                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6742                 .rpc_argp = &args,
6743                 .rpc_resp = &res,
6744         };
6745         int status;
6746
6747         dprintk("--> %s\n", __func__);
6748         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6749         dprintk("<-- %s status=%d\n", __func__, status);
6750
6751         return status;
6752 }
6753
6754 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6755 {
6756         struct nfs4_exception exception = { };
6757         int err;
6758
6759         do {
6760                 err = nfs4_handle_exception(server,
6761                                         _nfs4_proc_getdeviceinfo(server, pdev),
6762                                         &exception);
6763         } while (exception.retry);
6764         return err;
6765 }
6766 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6767
6768 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6769 {
6770         struct nfs4_layoutcommit_data *data = calldata;
6771         struct nfs_server *server = NFS_SERVER(data->args.inode);
6772
6773         if (nfs4_setup_sequence(server, &data->args.seq_args,
6774                                 &data->res.seq_res, task))
6775                 return;
6776         rpc_call_start(task);
6777 }
6778
6779 static void
6780 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6781 {
6782         struct nfs4_layoutcommit_data *data = calldata;
6783         struct nfs_server *server = NFS_SERVER(data->args.inode);
6784
6785         if (!nfs4_sequence_done(task, &data->res.seq_res))
6786                 return;
6787
6788         switch (task->tk_status) { /* Just ignore these failures */
6789         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6790         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6791         case -NFS4ERR_BADLAYOUT:     /* no layout */
6792         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6793                 task->tk_status = 0;
6794                 break;
6795         case 0:
6796                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6797                                                    data->res.fattr);
6798                 break;
6799         default:
6800                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6801                         rpc_restart_call_prepare(task);
6802                         return;
6803                 }
6804         }
6805 }
6806
6807 static void nfs4_layoutcommit_release(void *calldata)
6808 {
6809         struct nfs4_layoutcommit_data *data = calldata;
6810         struct pnfs_layout_segment *lseg, *tmp;
6811         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6812
6813         pnfs_cleanup_layoutcommit(data);
6814         /* Matched by references in pnfs_set_layoutcommit */
6815         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6816                 list_del_init(&lseg->pls_lc_list);
6817                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6818                                        &lseg->pls_flags))
6819                         pnfs_put_lseg(lseg);
6820         }
6821
6822         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6823         smp_mb__after_clear_bit();
6824         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6825
6826         put_rpccred(data->cred);
6827         kfree(data);
6828 }
6829
6830 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6831         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6832         .rpc_call_done = nfs4_layoutcommit_done,
6833         .rpc_release = nfs4_layoutcommit_release,
6834 };
6835
6836 int
6837 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6838 {
6839         struct rpc_message msg = {
6840                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6841                 .rpc_argp = &data->args,
6842                 .rpc_resp = &data->res,
6843                 .rpc_cred = data->cred,
6844         };
6845         struct rpc_task_setup task_setup_data = {
6846                 .task = &data->task,
6847                 .rpc_client = NFS_CLIENT(data->args.inode),
6848                 .rpc_message = &msg,
6849                 .callback_ops = &nfs4_layoutcommit_ops,
6850                 .callback_data = data,
6851                 .flags = RPC_TASK_ASYNC,
6852         };
6853         struct rpc_task *task;
6854         int status = 0;
6855
6856         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6857                 "lbw: %llu inode %lu\n",
6858                 data->task.tk_pid, sync,
6859                 data->args.lastbytewritten,
6860                 data->args.inode->i_ino);
6861
6862         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6863         task = rpc_run_task(&task_setup_data);
6864         if (IS_ERR(task))
6865                 return PTR_ERR(task);
6866         if (sync == false)
6867                 goto out;
6868         status = nfs4_wait_for_completion_rpc_task(task);
6869         if (status != 0)
6870                 goto out;
6871         status = task->tk_status;
6872 out:
6873         dprintk("%s: status %d\n", __func__, status);
6874         rpc_put_task(task);
6875         return status;
6876 }
6877
6878 static int
6879 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6880                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6881 {
6882         struct nfs41_secinfo_no_name_args args = {
6883                 .style = SECINFO_STYLE_CURRENT_FH,
6884         };
6885         struct nfs4_secinfo_res res = {
6886                 .flavors = flavors,
6887         };
6888         struct rpc_message msg = {
6889                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6890                 .rpc_argp = &args,
6891                 .rpc_resp = &res,
6892         };
6893         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6894 }
6895
6896 static int
6897 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6898                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6899 {
6900         struct nfs4_exception exception = { };
6901         int err;
6902         do {
6903                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6904                 switch (err) {
6905                 case 0:
6906                 case -NFS4ERR_WRONGSEC:
6907                 case -NFS4ERR_NOTSUPP:
6908                         goto out;
6909                 default:
6910                         err = nfs4_handle_exception(server, err, &exception);
6911                 }
6912         } while (exception.retry);
6913 out:
6914         return err;
6915 }
6916
6917 static int
6918 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6919                     struct nfs_fsinfo *info)
6920 {
6921         int err;
6922         struct page *page;
6923         rpc_authflavor_t flavor;
6924         struct nfs4_secinfo_flavors *flavors;
6925
6926         page = alloc_page(GFP_KERNEL);
6927         if (!page) {
6928                 err = -ENOMEM;
6929                 goto out;
6930         }
6931
6932         flavors = page_address(page);
6933         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6934
6935         /*
6936          * Fall back on "guess and check" method if
6937          * the server doesn't support SECINFO_NO_NAME
6938          */
6939         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6940                 err = nfs4_find_root_sec(server, fhandle, info);
6941                 goto out_freepage;
6942         }
6943         if (err)
6944                 goto out_freepage;
6945
6946         flavor = nfs_find_best_sec(flavors);
6947         if (err == 0)
6948                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6949
6950 out_freepage:
6951         put_page(page);
6952         if (err == -EACCES)
6953                 return -EPERM;
6954 out:
6955         return err;
6956 }
6957
6958 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6959 {
6960         int status;
6961         struct nfs41_test_stateid_args args = {
6962                 .stateid = stateid,
6963         };
6964         struct nfs41_test_stateid_res res;
6965         struct rpc_message msg = {
6966                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6967                 .rpc_argp = &args,
6968                 .rpc_resp = &res,
6969         };
6970
6971         dprintk("NFS call  test_stateid %p\n", stateid);
6972         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6973         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6974         if (status != NFS_OK) {
6975                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6976                 return status;
6977         }
6978         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6979         return -res.status;
6980 }
6981
6982 /**
6983  * nfs41_test_stateid - perform a TEST_STATEID operation
6984  *
6985  * @server: server / transport on which to perform the operation
6986  * @stateid: state ID to test
6987  *
6988  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6989  * Otherwise a negative NFS4ERR value is returned if the operation
6990  * failed or the state ID is not currently valid.
6991  */
6992 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6993 {
6994         struct nfs4_exception exception = { };
6995         int err;
6996         do {
6997                 err = _nfs41_test_stateid(server, stateid);
6998                 if (err != -NFS4ERR_DELAY)
6999                         break;
7000                 nfs4_handle_exception(server, err, &exception);
7001         } while (exception.retry);
7002         return err;
7003 }
7004
7005 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
7006 {
7007         struct nfs41_free_stateid_args args = {
7008                 .stateid = stateid,
7009         };
7010         struct nfs41_free_stateid_res res;
7011         struct rpc_message msg = {
7012                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
7013                 .rpc_argp = &args,
7014                 .rpc_resp = &res,
7015         };
7016         int status;
7017
7018         dprintk("NFS call  free_stateid %p\n", stateid);
7019         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
7020         status = nfs4_call_sync_sequence(server->client, server, &msg,
7021                                          &args.seq_args, &res.seq_res, 1);
7022         dprintk("NFS reply free_stateid: %d\n", status);
7023         return status;
7024 }
7025
7026 /**
7027  * nfs41_free_stateid - perform a FREE_STATEID operation
7028  *
7029  * @server: server / transport on which to perform the operation
7030  * @stateid: state ID to release
7031  *
7032  * Returns NFS_OK if the server freed "stateid".  Otherwise a
7033  * negative NFS4ERR value is returned.
7034  */
7035 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
7036 {
7037         struct nfs4_exception exception = { };
7038         int err;
7039         do {
7040                 err = _nfs4_free_stateid(server, stateid);
7041                 if (err != -NFS4ERR_DELAY)
7042                         break;
7043                 nfs4_handle_exception(server, err, &exception);
7044         } while (exception.retry);
7045         return err;
7046 }
7047
7048 static bool nfs41_match_stateid(const nfs4_stateid *s1,
7049                 const nfs4_stateid *s2)
7050 {
7051         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
7052                 return false;
7053
7054         if (s1->seqid == s2->seqid)
7055                 return true;
7056         if (s1->seqid == 0 || s2->seqid == 0)
7057                 return true;
7058
7059         return false;
7060 }
7061
7062 #endif /* CONFIG_NFS_V4_1 */
7063
7064 static bool nfs4_match_stateid(const nfs4_stateid *s1,
7065                 const nfs4_stateid *s2)
7066 {
7067         return nfs4_stateid_match(s1, s2);
7068 }
7069
7070
7071 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
7072         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7073         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7074         .recover_open   = nfs4_open_reclaim,
7075         .recover_lock   = nfs4_lock_reclaim,
7076         .establish_clid = nfs4_init_clientid,
7077         .get_clid_cred  = nfs4_get_setclientid_cred,
7078         .detect_trunking = nfs40_discover_server_trunking,
7079 };
7080
7081 #if defined(CONFIG_NFS_V4_1)
7082 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
7083         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7084         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7085         .recover_open   = nfs4_open_reclaim,
7086         .recover_lock   = nfs4_lock_reclaim,
7087         .establish_clid = nfs41_init_clientid,
7088         .get_clid_cred  = nfs4_get_exchange_id_cred,
7089         .reclaim_complete = nfs41_proc_reclaim_complete,
7090         .detect_trunking = nfs41_discover_server_trunking,
7091 };
7092 #endif /* CONFIG_NFS_V4_1 */
7093
7094 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
7095         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7096         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7097         .recover_open   = nfs4_open_expired,
7098         .recover_lock   = nfs4_lock_expired,
7099         .establish_clid = nfs4_init_clientid,
7100         .get_clid_cred  = nfs4_get_setclientid_cred,
7101 };
7102
7103 #if defined(CONFIG_NFS_V4_1)
7104 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
7105         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7106         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7107         .recover_open   = nfs41_open_expired,
7108         .recover_lock   = nfs41_lock_expired,
7109         .establish_clid = nfs41_init_clientid,
7110         .get_clid_cred  = nfs4_get_exchange_id_cred,
7111 };
7112 #endif /* CONFIG_NFS_V4_1 */
7113
7114 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
7115         .sched_state_renewal = nfs4_proc_async_renew,
7116         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
7117         .renew_lease = nfs4_proc_renew,
7118 };
7119
7120 #if defined(CONFIG_NFS_V4_1)
7121 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
7122         .sched_state_renewal = nfs41_proc_async_sequence,
7123         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
7124         .renew_lease = nfs4_proc_sequence,
7125 };
7126 #endif
7127
7128 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
7129         .minor_version = 0,
7130         .call_sync = _nfs4_call_sync,
7131         .match_stateid = nfs4_match_stateid,
7132         .find_root_sec = nfs4_find_root_sec,
7133         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
7134         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
7135         .state_renewal_ops = &nfs40_state_renewal_ops,
7136 };
7137
7138 #if defined(CONFIG_NFS_V4_1)
7139 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
7140         .minor_version = 1,
7141         .call_sync = _nfs4_call_sync_session,
7142         .match_stateid = nfs41_match_stateid,
7143         .find_root_sec = nfs41_find_root_sec,
7144         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7145         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7146         .state_renewal_ops = &nfs41_state_renewal_ops,
7147 };
7148 #endif
7149
7150 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
7151         [0] = &nfs_v4_0_minor_ops,
7152 #if defined(CONFIG_NFS_V4_1)
7153         [1] = &nfs_v4_1_minor_ops,
7154 #endif
7155 };
7156
7157 const struct inode_operations nfs4_dir_inode_operations = {
7158         .create         = nfs_create,
7159         .lookup         = nfs_lookup,
7160         .atomic_open    = nfs_atomic_open,
7161         .link           = nfs_link,
7162         .unlink         = nfs_unlink,
7163         .symlink        = nfs_symlink,
7164         .mkdir          = nfs_mkdir,
7165         .rmdir          = nfs_rmdir,
7166         .mknod          = nfs_mknod,
7167         .rename         = nfs_rename,
7168         .permission     = nfs_permission,
7169         .getattr        = nfs_getattr,
7170         .setattr        = nfs_setattr,
7171         .getxattr       = generic_getxattr,
7172         .setxattr       = generic_setxattr,
7173         .listxattr      = generic_listxattr,
7174         .removexattr    = generic_removexattr,
7175 };
7176
7177 static const struct inode_operations nfs4_file_inode_operations = {
7178         .permission     = nfs_permission,
7179         .getattr        = nfs_getattr,
7180         .setattr        = nfs_setattr,
7181         .getxattr       = generic_getxattr,
7182         .setxattr       = generic_setxattr,
7183         .listxattr      = generic_listxattr,
7184         .removexattr    = generic_removexattr,
7185 };
7186
7187 const struct nfs_rpc_ops nfs_v4_clientops = {
7188         .version        = 4,                    /* protocol version */
7189         .dentry_ops     = &nfs4_dentry_operations,
7190         .dir_inode_ops  = &nfs4_dir_inode_operations,
7191         .file_inode_ops = &nfs4_file_inode_operations,
7192         .file_ops       = &nfs4_file_operations,
7193         .getroot        = nfs4_proc_get_root,
7194         .submount       = nfs4_submount,
7195         .try_mount      = nfs4_try_mount,
7196         .getattr        = nfs4_proc_getattr,
7197         .setattr        = nfs4_proc_setattr,
7198         .lookup         = nfs4_proc_lookup,
7199         .access         = nfs4_proc_access,
7200         .readlink       = nfs4_proc_readlink,
7201         .create         = nfs4_proc_create,
7202         .remove         = nfs4_proc_remove,
7203         .unlink_setup   = nfs4_proc_unlink_setup,
7204         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
7205         .unlink_done    = nfs4_proc_unlink_done,
7206         .rename         = nfs4_proc_rename,
7207         .rename_setup   = nfs4_proc_rename_setup,
7208         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
7209         .rename_done    = nfs4_proc_rename_done,
7210         .link           = nfs4_proc_link,
7211         .symlink        = nfs4_proc_symlink,
7212         .mkdir          = nfs4_proc_mkdir,
7213         .rmdir          = nfs4_proc_remove,
7214         .readdir        = nfs4_proc_readdir,
7215         .mknod          = nfs4_proc_mknod,
7216         .statfs         = nfs4_proc_statfs,
7217         .fsinfo         = nfs4_proc_fsinfo,
7218         .pathconf       = nfs4_proc_pathconf,
7219         .set_capabilities = nfs4_server_capabilities,
7220         .decode_dirent  = nfs4_decode_dirent,
7221         .read_setup     = nfs4_proc_read_setup,
7222         .read_pageio_init = pnfs_pageio_init_read,
7223         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
7224         .read_done      = nfs4_read_done,
7225         .write_setup    = nfs4_proc_write_setup,
7226         .write_pageio_init = pnfs_pageio_init_write,
7227         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
7228         .write_done     = nfs4_write_done,
7229         .commit_setup   = nfs4_proc_commit_setup,
7230         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
7231         .commit_done    = nfs4_commit_done,
7232         .lock           = nfs4_proc_lock,
7233         .clear_acl_cache = nfs4_zap_acl_attr,
7234         .close_context  = nfs4_close_context,
7235         .open_context   = nfs4_atomic_open,
7236         .have_delegation = nfs4_have_delegation,
7237         .return_delegation = nfs4_inode_return_delegation,
7238         .alloc_client   = nfs4_alloc_client,
7239         .init_client    = nfs4_init_client,
7240         .free_client    = nfs4_free_client,
7241         .create_server  = nfs4_create_server,
7242         .clone_server   = nfs_clone_server,
7243 };
7244
7245 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
7246         .prefix = XATTR_NAME_NFSV4_ACL,
7247         .list   = nfs4_xattr_list_nfs4_acl,
7248         .get    = nfs4_xattr_get_nfs4_acl,
7249         .set    = nfs4_xattr_set_nfs4_acl,
7250 };
7251
7252 const struct xattr_handler *nfs4_xattr_handlers[] = {
7253         &nfs4_xattr_nfs4_acl_handler,
7254         NULL
7255 };
7256
7257 /*
7258  * Local variables:
7259  *  c-basic-offset: 8
7260  * End:
7261  */