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_shrink_slot_table - free retired slots from the slot table
 401  */
 402 static void nfs4_shrink_slot_table(struct nfs4_slot_table  *tbl, u32 newsize)
 403 {
 404         struct nfs4_slot **p;
 405         if (newsize >= tbl->max_slots)
 406                 return;
 407
 408         p = &tbl->slots;
 409         while (newsize--)
 410                 p = &(*p)->next;
 411         while (*p) {
 412                 struct nfs4_slot *slot = *p;
 413
 414                 *p = slot->next;
 415                 kfree(slot);
 416                 tbl->max_slots--;
 417         }
 418 }
 419
 420 /*
 421  * nfs4_free_slot - free a slot and efficiently update slot table.
 422  *
 423  * freeing a slot is trivially done by clearing its respective bit
 424  * in the bitmap.
 425  * If the freed slotid equals highest_used_slotid we want to update it
 426  * so that the server would be able to size down the slot table if needed,
 427  * otherwise we know that the highest_used_slotid is still in use.
 428  * When updating highest_used_slotid there may be "holes" in the bitmap
 429  * so we need to scan down from highest_used_slotid to 0 looking for the now
 430  * highest slotid in use.
 431  * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
 432  *
 433  * Must be called while holding tbl->slot_tbl_lock
 434  */
 435 static void
 436 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot)
 437 {
 438         u32 slotid = slot->slot_nr;
 439
 440         /* clear used bit in bitmap */
 441         __clear_bit(slotid, tbl->used_slots);
 442
 443         /* update highest_used_slotid when it is freed */
 444         if (slotid == tbl->highest_used_slotid) {
 445                 u32 new_max = find_last_bit(tbl->used_slots, slotid);
 446                 if (new_max < slotid)
 447                         tbl->highest_used_slotid = new_max;
 448                 else
 449                         tbl->highest_used_slotid = NFS4_NO_SLOT;
 450         }
 451         dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
 452                 slotid, tbl->highest_used_slotid);
 453 }
 454
 455 bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
 456 {
 457         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 458         return true;
 459 }
 460
 461 /*
 462  * Signal state manager thread if session fore channel is drained
 463  */
 464 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 465 {
 466         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 467                 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
 468                                 nfs4_set_task_privileged, NULL);
 469                 return;
 470         }
 471
 472         if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 473                 return;
 474
 475         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 476         complete(&ses->fc_slot_table.complete);
 477 }
 478
 479 /*
 480  * Signal state manager thread if session back channel is drained
 481  */
 482 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 483 {
 484         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 485             ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 486                 return;
 487         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 488         complete(&ses->bc_slot_table.complete);
 489 }
 490
 491 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 492 {
 493         struct nfs4_session *session;
 494         struct nfs4_slot_table *tbl;
 495
 496         if (!res->sr_slot) {
 497                 /* just wake up the next guy waiting since
 498                  * we may have not consumed a slot after all */
 499                 dprintk("%s: No slot\n", __func__);
 500                 return;
 501         }
 502         tbl = res->sr_slot->table;
 503         session = tbl->session;
 504
 505         spin_lock(&tbl->slot_tbl_lock);
 506         nfs4_free_slot(tbl, res->sr_slot);
 507         nfs4_check_drain_fc_complete(session);
 508         spin_unlock(&tbl->slot_tbl_lock);
 509         res->sr_slot = NULL;
 510 }
 511
 512 /* Update the client's idea of target_highest_slotid */
 513 static void nfs41_set_target_slotid_locked(struct nfs4_slot_table *tbl,
 514                 u32 target_highest_slotid)
 515 {
 516         unsigned int max_slotid, i;
 517
 518         if (tbl->target_highest_slotid == target_highest_slotid)
 519                 return;
 520         tbl->target_highest_slotid = target_highest_slotid;
 521         tbl->generation++;
 522
 523         max_slotid = min(NFS4_MAX_SLOT_TABLE - 1, tbl->target_highest_slotid);
 524         for (i = tbl->max_slotid + 1; i <= max_slotid; i++)
 525                 rpc_wake_up_next(&tbl->slot_tbl_waitq);
 526         tbl->max_slotid = max_slotid;
 527 }
 528
 529 void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
 530                 u32 target_highest_slotid)
 531 {
 532         spin_lock(&tbl->slot_tbl_lock);
 533         nfs41_set_target_slotid_locked(tbl, target_highest_slotid);
 534         spin_unlock(&tbl->slot_tbl_lock);
 535 }
 536
 537 static void nfs41_set_server_slotid_locked(struct nfs4_slot_table *tbl,
 538                 u32 highest_slotid)
 539 {
 540         if (tbl->server_highest_slotid == highest_slotid)
 541                 return;
 542         if (tbl->highest_used_slotid > highest_slotid)
 543                 return;
 544         /* Deallocate slots */
 545         nfs4_shrink_slot_table(tbl, highest_slotid + 1);
 546         tbl->server_highest_slotid = highest_slotid;
 547 }
 548
 549 static void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
 550                 struct nfs4_slot *slot,
 551                 struct nfs4_sequence_res *res)
 552 {
 553         spin_lock(&tbl->slot_tbl_lock);
 554         if (tbl->generation != slot->generation)
 555                 goto out;
 556         nfs41_set_server_slotid_locked(tbl, res->sr_highest_slotid);
 557         nfs41_set_target_slotid_locked(tbl, res->sr_target_highest_slotid);
 558 out:
 559         spin_unlock(&tbl->slot_tbl_lock);
 560 }
 561
 562 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 563 {
 564         struct nfs4_session *session;
 565         struct nfs4_slot *slot;
 566         unsigned long timestamp;
 567         struct nfs_client *clp;
 568
 569         /*
 570          * sr_status remains 1 if an RPC level error occurred. The server
 571          * may or may not have processed the sequence operation..
 572          * Proceed as if the server received and processed the sequence
 573          * operation.
 574          */
 575         if (res->sr_status == 1)
 576                 res->sr_status = NFS_OK;
 577
 578         /* don't increment the sequence number if the task wasn't sent */
 579         if (!RPC_WAS_SENT(task))
 580                 goto out;
 581
 582         slot = res->sr_slot;
 583         session = slot->table->session;
 584
 585         /* Check the SEQUENCE operation status */
 586         switch (res->sr_status) {
 587         case 0:
 588                 /* Update the slot's sequence and clientid lease timer */
 589                 ++slot->seq_nr;
 590                 timestamp = slot->renewal_time;
 591                 clp = session->clp;
 592                 do_renew_lease(clp, timestamp);
 593                 /* Check sequence flags */
 594                 if (res->sr_status_flags != 0)
 595                         nfs4_schedule_lease_recovery(clp);
 596                 nfs41_update_target_slotid(slot->table, slot, res);
 597                 break;
 598         case -NFS4ERR_DELAY:
 599                 /* The server detected a resend of the RPC call and
 600                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 601                  * of RFC5661.
 602                  */
 603                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 604                         __func__,
 605                         slot->slot_nr,
 606                         slot->seq_nr);
 607                 goto out_retry;
 608         default:
 609                 /* Just update the slot sequence no. */
 610                 ++slot->seq_nr;
 611         }
 612 out:
 613         /* The session may be reset by one of the error handlers. */
 614         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 615         nfs41_sequence_free_slot(res);
 616         return 1;
 617 out_retry:
 618         if (!rpc_restart_call(task))
 619                 goto out;
 620         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 621         return 0;
 622 }
 623
 624 static int nfs4_sequence_done(struct rpc_task *task,
 625                                struct nfs4_sequence_res *res)
 626 {
 627         if (res->sr_slot == NULL)
 628                 return 1;
 629         return nfs41_sequence_done(task, res);
 630 }
 631
 632 static struct nfs4_slot *nfs4_new_slot(struct nfs4_slot_table  *tbl,
 633                 u32 slotid, u32 seq_init, gfp_t gfp_mask)
 634 {
 635         struct nfs4_slot *slot;
 636
 637         slot = kzalloc(sizeof(*slot), gfp_mask);
 638         if (slot) {
 639                 slot->table = tbl;
 640                 slot->slot_nr = slotid;
 641                 slot->seq_nr = seq_init;
 642         }
 643         return slot;
 644 }
 645
 646 static struct nfs4_slot *nfs4_find_or_create_slot(struct nfs4_slot_table  *tbl,
 647                 u32 slotid, u32 seq_init, gfp_t gfp_mask)
 648 {
 649         struct nfs4_slot **p, *slot;
 650
 651         p = &tbl->slots;
 652         for (;;) {
 653                 if (*p == NULL) {
 654                         *p = nfs4_new_slot(tbl, tbl->max_slots,
 655                                         seq_init, gfp_mask);
 656                         if (*p == NULL)
 657                                 break;
 658                         tbl->max_slots++;
 659                 }
 660                 slot = *p;
 661                 if (slot->slot_nr == slotid)
 662                         return slot;
 663                 p = &slot->next;
 664         }
 665         return NULL;
 666 }
 667
 668 /*
 669  * nfs4_alloc_slot - efficiently look for a free slot
 670  *
 671  * nfs4_alloc_slot looks for an unset bit in the used_slots bitmap.
 672  * If found, we mark the slot as used, update the highest_used_slotid,
 673  * and respectively set up the sequence operation args.
 674  *
 675  * Note: must be called with under the slot_tbl_lock.
 676  */
 677 static struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl)
 678 {
 679         struct nfs4_slot *ret = NULL;
 680         u32 slotid;
 681
 682         dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
 683                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 684                 tbl->max_slotid + 1);
 685         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slotid + 1);
 686         if (slotid > tbl->max_slotid)
 687                 goto out;
 688         ret = nfs4_find_or_create_slot(tbl, slotid, 1, GFP_NOWAIT);
 689         if (ret == NULL)
 690                 goto out;
 691         __set_bit(slotid, tbl->used_slots);
 692         if (slotid > tbl->highest_used_slotid ||
 693                         tbl->highest_used_slotid == NFS4_NO_SLOT)
 694                 tbl->highest_used_slotid = slotid;
 695         ret->renewal_time = jiffies;
 696         ret->generation = tbl->generation;
 697
 698 out:
 699         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 700                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 701                 ret ? ret->slot_nr : -1);
 702         return ret;
 703 }
 704
 705 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 706                 struct nfs4_sequence_res *res, int cache_reply)
 707 {
 708         args->sa_slot = NULL;
 709         args->sa_cache_this = 0;
 710         if (cache_reply)
 711                 args->sa_cache_this = 1;
 712         res->sr_slot = NULL;
 713 }
 714
 715 int nfs41_setup_sequence(struct nfs4_session *session,
 716                                 struct nfs4_sequence_args *args,
 717                                 struct nfs4_sequence_res *res,
 718                                 struct rpc_task *task)
 719 {
 720         struct nfs4_slot *slot;
 721         struct nfs4_slot_table *tbl;
 722
 723         dprintk("--> %s\n", __func__);
 724         /* slot already allocated? */
 725         if (res->sr_slot != NULL)
 726                 return 0;
 727
 728         tbl = &session->fc_slot_table;
 729
 730         spin_lock(&tbl->slot_tbl_lock);
 731         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 732             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 733                 /* The state manager will wait until the slot table is empty */
 734                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 735                 spin_unlock(&tbl->slot_tbl_lock);
 736                 dprintk("%s session is draining\n", __func__);
 737                 return -EAGAIN;
 738         }
 739
 740         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 741             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 742                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 743                 spin_unlock(&tbl->slot_tbl_lock);
 744                 dprintk("%s enforce FIFO order\n", __func__);
 745                 return -EAGAIN;
 746         }
 747
 748         slot = nfs4_alloc_slot(tbl);
 749         if (slot == NULL) {
 750                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 751                 spin_unlock(&tbl->slot_tbl_lock);
 752                 dprintk("<-- %s: no free slots\n", __func__);
 753                 return -EAGAIN;
 754         }
 755         spin_unlock(&tbl->slot_tbl_lock);
 756
 757         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 758
 759         args->sa_slot = slot;
 760
 761         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 762                         slot->slot_nr, slot->seq_nr);
 763
 764         res->sr_slot = slot;
 765         res->sr_status_flags = 0;
 766         /*
 767          * sr_status is only set in decode_sequence, and so will remain
 768          * set to 1 if an rpc level failure occurs.
 769          */
 770         res->sr_status = 1;
 771         return 0;
 772 }
 773 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 774
 775 int nfs4_setup_sequence(const struct nfs_server *server,
 776                         struct nfs4_sequence_args *args,
 777                         struct nfs4_sequence_res *res,
 778                         struct rpc_task *task)
 779 {
 780         struct nfs4_session *session = nfs4_get_session(server);
 781         int ret = 0;
 782
 783         if (session == NULL)
 784                 goto out;
 785
 786         dprintk("--> %s clp %p session %p sr_slot %d\n",
 787                 __func__, session->clp, session, res->sr_slot ?
 788                         res->sr_slot->slot_nr : -1);
 789
 790         ret = nfs41_setup_sequence(session, args, res, task);
 791 out:
 792         dprintk("<-- %s status=%d\n", __func__, ret);
 793         return ret;
 794 }
 795
 796 struct nfs41_call_sync_data {
 797         const struct nfs_server *seq_server;
 798         struct nfs4_sequence_args *seq_args;
 799         struct nfs4_sequence_res *seq_res;
 800 };
 801
 802 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 803 {
 804         struct nfs41_call_sync_data *data = calldata;
 805
 806         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 807
 808         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 809                                 data->seq_res, task))
 810                 return;
 811         rpc_call_start(task);
 812 }
 813
 814 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 815 {
 816         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 817         nfs41_call_sync_prepare(task, calldata);
 818 }
 819
 820 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 821 {
 822         struct nfs41_call_sync_data *data = calldata;
 823
 824         nfs41_sequence_done(task, data->seq_res);
 825 }
 826
 827 static const struct rpc_call_ops nfs41_call_sync_ops = {
 828         .rpc_call_prepare = nfs41_call_sync_prepare,
 829         .rpc_call_done = nfs41_call_sync_done,
 830 };
 831
 832 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 833         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 834         .rpc_call_done = nfs41_call_sync_done,
 835 };
 836
 837 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 838                                    struct nfs_server *server,
 839                                    struct rpc_message *msg,
 840                                    struct nfs4_sequence_args *args,
 841                                    struct nfs4_sequence_res *res,
 842                                    int privileged)
 843 {
 844         int ret;
 845         struct rpc_task *task;
 846         struct nfs41_call_sync_data data = {
 847                 .seq_server = server,
 848                 .seq_args = args,
 849                 .seq_res = res,
 850         };
 851         struct rpc_task_setup task_setup = {
 852                 .rpc_client = clnt,
 853                 .rpc_message = msg,
 854                 .callback_ops = &nfs41_call_sync_ops,
 855                 .callback_data = &data
 856         };
 857
 858         if (privileged)
 859                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 860         task = rpc_run_task(&task_setup);
 861         if (IS_ERR(task))
 862                 ret = PTR_ERR(task);
 863         else {
 864                 ret = task->tk_status;
 865                 rpc_put_task(task);
 866         }
 867         return ret;
 868 }
 869
 870 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 871                             struct nfs_server *server,
 872                             struct rpc_message *msg,
 873                             struct nfs4_sequence_args *args,
 874                             struct nfs4_sequence_res *res,
 875                             int cache_reply)
 876 {
 877         nfs41_init_sequence(args, res, cache_reply);
 878         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 879 }
 880
 881 #else
 882 static inline
 883 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 884                 struct nfs4_sequence_res *res, int cache_reply)
 885 {
 886 }
 887
 888 static int nfs4_sequence_done(struct rpc_task *task,
 889                                struct nfs4_sequence_res *res)
 890 {
 891         return 1;
 892 }
 893 #endif /* CONFIG_NFS_V4_1 */
 894
 895 int _nfs4_call_sync(struct rpc_clnt *clnt,
 896                     struct nfs_server *server,
 897                     struct rpc_message *msg,
 898                     struct nfs4_sequence_args *args,
 899                     struct nfs4_sequence_res *res,
 900                     int cache_reply)
 901 {
 902         nfs41_init_sequence(args, res, cache_reply);
 903         return rpc_call_sync(clnt, msg, 0);
 904 }
 905
 906 static inline
 907 int nfs4_call_sync(struct rpc_clnt *clnt,
 908                    struct nfs_server *server,
 909                    struct rpc_message *msg,
 910                    struct nfs4_sequence_args *args,
 911                    struct nfs4_sequence_res *res,
 912                    int cache_reply)
 913 {
 914         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 915                                                 args, res, cache_reply);
 916 }
 917
 918 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 919 {
 920         struct nfs_inode *nfsi = NFS_I(dir);
 921
 922         spin_lock(&dir->i_lock);
 923         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 924         if (!cinfo->atomic || cinfo->before != dir->i_version)
 925                 nfs_force_lookup_revalidate(dir);
 926         dir->i_version = cinfo->after;
 927         spin_unlock(&dir->i_lock);
 928 }
 929
 930 struct nfs4_opendata {
 931         struct kref kref;
 932         struct nfs_openargs o_arg;
 933         struct nfs_openres o_res;
 934         struct nfs_open_confirmargs c_arg;
 935         struct nfs_open_confirmres c_res;
 936         struct nfs4_string owner_name;
 937         struct nfs4_string group_name;
 938         struct nfs_fattr f_attr;
 939         struct dentry *dir;
 940         struct dentry *dentry;
 941         struct nfs4_state_owner *owner;
 942         struct nfs4_state *state;
 943         struct iattr attrs;
 944         unsigned long timestamp;
 945         unsigned int rpc_done : 1;
 946         int rpc_status;
 947         int cancelled;
 948 };
 949
 950
 951 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 952 {
 953         p->o_res.f_attr = &p->f_attr;
 954         p->o_res.seqid = p->o_arg.seqid;
 955         p->c_res.seqid = p->c_arg.seqid;
 956         p->o_res.server = p->o_arg.server;
 957         p->o_res.access_request = p->o_arg.access;
 958         nfs_fattr_init(&p->f_attr);
 959         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 960 }
 961
 962 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 963                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 964                 const struct iattr *attrs,
 965                 gfp_t gfp_mask)
 966 {
 967         struct dentry *parent = dget_parent(dentry);
 968         struct inode *dir = parent->d_inode;
 969         struct nfs_server *server = NFS_SERVER(dir);
 970         struct nfs4_opendata *p;
 971
 972         p = kzalloc(sizeof(*p), gfp_mask);
 973         if (p == NULL)
 974                 goto err;
 975         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 976         if (p->o_arg.seqid == NULL)
 977                 goto err_free;
 978         nfs_sb_active(dentry->d_sb);
 979         p->dentry = dget(dentry);
 980         p->dir = parent;
 981         p->owner = sp;
 982         atomic_inc(&sp->so_count);
 983         p->o_arg.fh = NFS_FH(dir);
 984         p->o_arg.open_flags = flags;
 985         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 986         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 987          * will return permission denied for all bits until close */
 988         if (!(flags & O_EXCL)) {
 989                 /* ask server to check for all possible rights as results
 990                  * are cached */
 991                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 992                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 993         }
 994         p->o_arg.clientid = server->nfs_client->cl_clientid;
 995         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 996         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 997         p->o_arg.name = &dentry->d_name;
 998         p->o_arg.server = server;
 999         p->o_arg.bitmask = server->attr_bitmask;
1000         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1001         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
1002         if (attrs != NULL && attrs->ia_valid != 0) {
1003                 __be32 verf[2];
1004
1005                 p->o_arg.u.attrs = &p->attrs;
1006                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1007
1008                 verf[0] = jiffies;
1009                 verf[1] = current->pid;
1010                 memcpy(p->o_arg.u.verifier.data, verf,
1011                                 sizeof(p->o_arg.u.verifier.data));
1012         }
1013         p->c_arg.fh = &p->o_res.fh;
1014         p->c_arg.stateid = &p->o_res.stateid;
1015         p->c_arg.seqid = p->o_arg.seqid;
1016         nfs4_init_opendata_res(p);
1017         kref_init(&p->kref);
1018         return p;
1019 err_free:
1020         kfree(p);
1021 err:
1022         dput(parent);
1023         return NULL;
1024 }
1025
1026 static void nfs4_opendata_free(struct kref *kref)
1027 {
1028         struct nfs4_opendata *p = container_of(kref,
1029                         struct nfs4_opendata, kref);
1030         struct super_block *sb = p->dentry->d_sb;
1031
1032         nfs_free_seqid(p->o_arg.seqid);
1033         if (p->state != NULL)
1034                 nfs4_put_open_state(p->state);
1035         nfs4_put_state_owner(p->owner);
1036         dput(p->dir);
1037         dput(p->dentry);
1038         nfs_sb_deactive(sb);
1039         nfs_fattr_free_names(&p->f_attr);
1040         kfree(p);
1041 }
1042
1043 static void nfs4_opendata_put(struct nfs4_opendata *p)
1044 {
1045         if (p != NULL)
1046                 kref_put(&p->kref, nfs4_opendata_free);
1047 }
1048
1049 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1050 {
1051         int ret;
1052
1053         ret = rpc_wait_for_completion_task(task);
1054         return ret;
1055 }
1056
1057 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1058 {
1059         int ret = 0;
1060
1061         if (open_mode & (O_EXCL|O_TRUNC))
1062                 goto out;
1063         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1064                 case FMODE_READ:
1065                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1066                                 && state->n_rdonly != 0;
1067                         break;
1068                 case FMODE_WRITE:
1069                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1070                                 && state->n_wronly != 0;
1071                         break;
1072                 case FMODE_READ|FMODE_WRITE:
1073                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1074                                 && state->n_rdwr != 0;
1075         }
1076 out:
1077         return ret;
1078 }
1079
1080 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1081 {
1082         if (delegation == NULL)
1083                 return 0;
1084         if ((delegation->type & fmode) != fmode)
1085                 return 0;
1086         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1087                 return 0;
1088         nfs_mark_delegation_referenced(delegation);
1089         return 1;
1090 }
1091
1092 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1093 {
1094         switch (fmode) {
1095                 case FMODE_WRITE:
1096                         state->n_wronly++;
1097                         break;
1098                 case FMODE_READ:
1099                         state->n_rdonly++;
1100                         break;
1101                 case FMODE_READ|FMODE_WRITE:
1102                         state->n_rdwr++;
1103         }
1104         nfs4_state_set_mode_locked(state, state->state | fmode);
1105 }
1106
1107 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1108 {
1109         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1110                 nfs4_stateid_copy(&state->stateid, stateid);
1111         nfs4_stateid_copy(&state->open_stateid, stateid);
1112         switch (fmode) {
1113                 case FMODE_READ:
1114                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1115                         break;
1116                 case FMODE_WRITE:
1117                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1118                         break;
1119                 case FMODE_READ|FMODE_WRITE:
1120                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1121         }
1122 }
1123
1124 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1125 {
1126         write_seqlock(&state->seqlock);
1127         nfs_set_open_stateid_locked(state, stateid, fmode);
1128         write_sequnlock(&state->seqlock);
1129 }
1130
1131 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1132 {
1133         /*
1134          * Protect the call to nfs4_state_set_mode_locked and
1135          * serialise the stateid update
1136          */
1137         write_seqlock(&state->seqlock);
1138         if (deleg_stateid != NULL) {
1139                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1140                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1141         }
1142         if (open_stateid != NULL)
1143                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1144         write_sequnlock(&state->seqlock);
1145         spin_lock(&state->owner->so_lock);
1146         update_open_stateflags(state, fmode);
1147         spin_unlock(&state->owner->so_lock);
1148 }
1149
1150 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1151 {
1152         struct nfs_inode *nfsi = NFS_I(state->inode);
1153         struct nfs_delegation *deleg_cur;
1154         int ret = 0;
1155
1156         fmode &= (FMODE_READ|FMODE_WRITE);
1157
1158         rcu_read_lock();
1159         deleg_cur = rcu_dereference(nfsi->delegation);
1160         if (deleg_cur == NULL)
1161                 goto no_delegation;
1162
1163         spin_lock(&deleg_cur->lock);
1164         if (nfsi->delegation != deleg_cur ||
1165             (deleg_cur->type & fmode) != fmode)
1166                 goto no_delegation_unlock;
1167
1168         if (delegation == NULL)
1169                 delegation = &deleg_cur->stateid;
1170         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1171                 goto no_delegation_unlock;
1172
1173         nfs_mark_delegation_referenced(deleg_cur);
1174         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1175         ret = 1;
1176 no_delegation_unlock:
1177         spin_unlock(&deleg_cur->lock);
1178 no_delegation:
1179         rcu_read_unlock();
1180
1181         if (!ret && open_stateid != NULL) {
1182                 __update_open_stateid(state, open_stateid, NULL, fmode);
1183                 ret = 1;
1184         }
1185
1186         return ret;
1187 }
1188
1189
1190 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1191 {
1192         struct nfs_delegation *delegation;
1193
1194         rcu_read_lock();
1195         delegation = rcu_dereference(NFS_I(inode)->delegation);
1196         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1197                 rcu_read_unlock();
1198                 return;
1199         }
1200         rcu_read_unlock();
1201         nfs4_inode_return_delegation(inode);
1202 }
1203
1204 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1205 {
1206         struct nfs4_state *state = opendata->state;
1207         struct nfs_inode *nfsi = NFS_I(state->inode);
1208         struct nfs_delegation *delegation;
1209         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1210         fmode_t fmode = opendata->o_arg.fmode;
1211         nfs4_stateid stateid;
1212         int ret = -EAGAIN;
1213
1214         for (;;) {
1215                 if (can_open_cached(state, fmode, open_mode)) {
1216                         spin_lock(&state->owner->so_lock);
1217                         if (can_open_cached(state, fmode, open_mode)) {
1218                                 update_open_stateflags(state, fmode);
1219                                 spin_unlock(&state->owner->so_lock);
1220                                 goto out_return_state;
1221                         }
1222                         spin_unlock(&state->owner->so_lock);
1223                 }
1224                 rcu_read_lock();
1225                 delegation = rcu_dereference(nfsi->delegation);
1226                 if (!can_open_delegated(delegation, fmode)) {
1227                         rcu_read_unlock();
1228                         break;
1229                 }
1230                 /* Save the delegation */
1231                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1232                 rcu_read_unlock();
1233                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1234                 if (ret != 0)
1235                         goto out;
1236                 ret = -EAGAIN;
1237
1238                 /* Try to update the stateid using the delegation */
1239                 if (update_open_stateid(state, NULL, &stateid, fmode))
1240                         goto out_return_state;
1241         }
1242 out:
1243         return ERR_PTR(ret);
1244 out_return_state:
1245         atomic_inc(&state->count);
1246         return state;
1247 }
1248
1249 static void
1250 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1251 {
1252         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1253         struct nfs_delegation *delegation;
1254         int delegation_flags = 0;
1255
1256         rcu_read_lock();
1257         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1258         if (delegation)
1259                 delegation_flags = delegation->flags;
1260         rcu_read_unlock();
1261         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1262                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1263                                    "returning a delegation for "
1264                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1265                                    clp->cl_hostname);
1266         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1267                 nfs_inode_set_delegation(state->inode,
1268                                          data->owner->so_cred,
1269                                          &data->o_res);
1270         else
1271                 nfs_inode_reclaim_delegation(state->inode,
1272                                              data->owner->so_cred,
1273                                              &data->o_res);
1274 }
1275
1276 /*
1277  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1278  * and update the nfs4_state.
1279  */
1280 static struct nfs4_state *
1281 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1282 {
1283         struct inode *inode = data->state->inode;
1284         struct nfs4_state *state = data->state;
1285         int ret;
1286
1287         if (!data->rpc_done) {
1288                 ret = data->rpc_status;
1289                 goto err;
1290         }
1291
1292         ret = -ESTALE;
1293         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1294             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1295             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1296                 goto err;
1297
1298         ret = -ENOMEM;
1299         state = nfs4_get_open_state(inode, data->owner);
1300         if (state == NULL)
1301                 goto err;
1302
1303         ret = nfs_refresh_inode(inode, &data->f_attr);
1304         if (ret)
1305                 goto err;
1306
1307         if (data->o_res.delegation_type != 0)
1308                 nfs4_opendata_check_deleg(data, state);
1309         update_open_stateid(state, &data->o_res.stateid, NULL,
1310                             data->o_arg.fmode);
1311
1312         return state;
1313 err:
1314         return ERR_PTR(ret);
1315
1316 }
1317
1318 static struct nfs4_state *
1319 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1320 {
1321         struct inode *inode;
1322         struct nfs4_state *state = NULL;
1323         int ret;
1324
1325         if (!data->rpc_done) {
1326                 state = nfs4_try_open_cached(data);
1327                 goto out;
1328         }
1329
1330         ret = -EAGAIN;
1331         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1332                 goto err;
1333         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1334         ret = PTR_ERR(inode);
1335         if (IS_ERR(inode))
1336                 goto err;
1337         ret = -ENOMEM;
1338         state = nfs4_get_open_state(inode, data->owner);
1339         if (state == NULL)
1340                 goto err_put_inode;
1341         if (data->o_res.delegation_type != 0)
1342                 nfs4_opendata_check_deleg(data, state);
1343         update_open_stateid(state, &data->o_res.stateid, NULL,
1344                         data->o_arg.fmode);
1345         iput(inode);
1346 out:
1347         return state;
1348 err_put_inode:
1349         iput(inode);
1350 err:
1351         return ERR_PTR(ret);
1352 }
1353
1354 static struct nfs4_state *
1355 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1356 {
1357         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1358                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1359         return _nfs4_opendata_to_nfs4_state(data);
1360 }
1361
1362 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1363 {
1364         struct nfs_inode *nfsi = NFS_I(state->inode);
1365         struct nfs_open_context *ctx;
1366
1367         spin_lock(&state->inode->i_lock);
1368         list_for_each_entry(ctx, &nfsi->open_files, list) {
1369                 if (ctx->state != state)
1370                         continue;
1371                 get_nfs_open_context(ctx);
1372                 spin_unlock(&state->inode->i_lock);
1373                 return ctx;
1374         }
1375         spin_unlock(&state->inode->i_lock);
1376         return ERR_PTR(-ENOENT);
1377 }
1378
1379 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1380 {
1381         struct nfs4_opendata *opendata;
1382
1383         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1384         if (opendata == NULL)
1385                 return ERR_PTR(-ENOMEM);
1386         opendata->state = state;
1387         atomic_inc(&state->count);
1388         return opendata;
1389 }
1390
1391 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1392 {
1393         struct nfs4_state *newstate;
1394         int ret;
1395
1396         opendata->o_arg.open_flags = 0;
1397         opendata->o_arg.fmode = fmode;
1398         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1399         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1400         nfs4_init_opendata_res(opendata);
1401         ret = _nfs4_recover_proc_open(opendata);
1402         if (ret != 0)
1403                 return ret;
1404         newstate = nfs4_opendata_to_nfs4_state(opendata);
1405         if (IS_ERR(newstate))
1406                 return PTR_ERR(newstate);
1407         nfs4_close_state(newstate, fmode);
1408         *res = newstate;
1409         return 0;
1410 }
1411
1412 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1413 {
1414         struct nfs4_state *newstate;
1415         int ret;
1416
1417         /* memory barrier prior to reading state->n_* */
1418         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1419         smp_rmb();
1420         if (state->n_rdwr != 0) {
1421                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1422                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1423                 if (ret != 0)
1424                         return ret;
1425                 if (newstate != state)
1426                         return -ESTALE;
1427         }
1428         if (state->n_wronly != 0) {
1429                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1430                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1431                 if (ret != 0)
1432                         return ret;
1433                 if (newstate != state)
1434                         return -ESTALE;
1435         }
1436         if (state->n_rdonly != 0) {
1437                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1438                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1439                 if (ret != 0)
1440                         return ret;
1441                 if (newstate != state)
1442                         return -ESTALE;
1443         }
1444         /*
1445          * We may have performed cached opens for all three recoveries.
1446          * Check if we need to update the current stateid.
1447          */
1448         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1449             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1450                 write_seqlock(&state->seqlock);
1451                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1452                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1453                 write_sequnlock(&state->seqlock);
1454         }
1455         return 0;
1456 }
1457
1458 /*
1459  * OPEN_RECLAIM:
1460  *      reclaim state on the server after a reboot.
1461  */
1462 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1463 {
1464         struct nfs_delegation *delegation;
1465         struct nfs4_opendata *opendata;
1466         fmode_t delegation_type = 0;
1467         int status;
1468
1469         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1470         if (IS_ERR(opendata))
1471                 return PTR_ERR(opendata);
1472         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1473         opendata->o_arg.fh = NFS_FH(state->inode);
1474         rcu_read_lock();
1475         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1476         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1477                 delegation_type = delegation->type;
1478         rcu_read_unlock();
1479         opendata->o_arg.u.delegation_type = delegation_type;
1480         status = nfs4_open_recover(opendata, state);
1481         nfs4_opendata_put(opendata);
1482         return status;
1483 }
1484
1485 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1486 {
1487         struct nfs_server *server = NFS_SERVER(state->inode);
1488         struct nfs4_exception exception = { };
1489         int err;
1490         do {
1491                 err = _nfs4_do_open_reclaim(ctx, state);
1492                 if (err != -NFS4ERR_DELAY)
1493                         break;
1494                 nfs4_handle_exception(server, err, &exception);
1495         } while (exception.retry);
1496         return err;
1497 }
1498
1499 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1500 {
1501         struct nfs_open_context *ctx;
1502         int ret;
1503
1504         ctx = nfs4_state_find_open_context(state);
1505         if (IS_ERR(ctx))
1506                 return PTR_ERR(ctx);
1507         ret = nfs4_do_open_reclaim(ctx, state);
1508         put_nfs_open_context(ctx);
1509         return ret;
1510 }
1511
1512 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1513 {
1514         struct nfs4_opendata *opendata;
1515         int ret;
1516
1517         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1518         if (IS_ERR(opendata))
1519                 return PTR_ERR(opendata);
1520         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1521         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1522         ret = nfs4_open_recover(opendata, state);
1523         nfs4_opendata_put(opendata);
1524         return ret;
1525 }
1526
1527 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1528 {
1529         struct nfs4_exception exception = { };
1530         struct nfs_server *server = NFS_SERVER(state->inode);
1531         int err;
1532         do {
1533                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1534                 switch (err) {
1535                         case 0:
1536                         case -ENOENT:
1537                         case -ESTALE:
1538                                 goto out;
1539                         case -NFS4ERR_BADSESSION:
1540                         case -NFS4ERR_BADSLOT:
1541                         case -NFS4ERR_BAD_HIGH_SLOT:
1542                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1543                         case -NFS4ERR_DEADSESSION:
1544                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1545                                 goto out;
1546                         case -NFS4ERR_STALE_CLIENTID:
1547                         case -NFS4ERR_STALE_STATEID:
1548                         case -NFS4ERR_EXPIRED:
1549                                 /* Don't recall a delegation if it was lost */
1550                                 nfs4_schedule_lease_recovery(server->nfs_client);
1551                                 goto out;
1552                         case -ERESTARTSYS:
1553                                 /*
1554                                  * The show must go on: exit, but mark the
1555                                  * stateid as needing recovery.
1556                                  */
1557                         case -NFS4ERR_DELEG_REVOKED:
1558                         case -NFS4ERR_ADMIN_REVOKED:
1559                         case -NFS4ERR_BAD_STATEID:
1560                                 nfs_inode_find_state_and_recover(state->inode,
1561                                                 stateid);
1562                                 nfs4_schedule_stateid_recovery(server, state);
1563                         case -EKEYEXPIRED:
1564                                 /*
1565                                  * User RPCSEC_GSS context has expired.
1566                                  * We cannot recover this stateid now, so
1567                                  * skip it and allow recovery thread to
1568                                  * proceed.
1569                                  */
1570                         case -ENOMEM:
1571                                 err = 0;
1572                                 goto out;
1573                 }
1574                 err = nfs4_handle_exception(server, err, &exception);
1575         } while (exception.retry);
1576 out:
1577         return err;
1578 }
1579
1580 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1581 {
1582         struct nfs4_opendata *data = calldata;
1583
1584         data->rpc_status = task->tk_status;
1585         if (data->rpc_status == 0) {
1586                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1587                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1588                 renew_lease(data->o_res.server, data->timestamp);
1589                 data->rpc_done = 1;
1590         }
1591 }
1592
1593 static void nfs4_open_confirm_release(void *calldata)
1594 {
1595         struct nfs4_opendata *data = calldata;
1596         struct nfs4_state *state = NULL;
1597
1598         /* If this request hasn't been cancelled, do nothing */
1599         if (data->cancelled == 0)
1600                 goto out_free;
1601         /* In case of error, no cleanup! */
1602         if (!data->rpc_done)
1603                 goto out_free;
1604         state = nfs4_opendata_to_nfs4_state(data);
1605         if (!IS_ERR(state))
1606                 nfs4_close_state(state, data->o_arg.fmode);
1607 out_free:
1608         nfs4_opendata_put(data);
1609 }
1610
1611 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1612         .rpc_call_done = nfs4_open_confirm_done,
1613         .rpc_release = nfs4_open_confirm_release,
1614 };
1615
1616 /*
1617  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1618  */
1619 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1620 {
1621         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1622         struct rpc_task *task;
1623         struct  rpc_message msg = {
1624                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1625                 .rpc_argp = &data->c_arg,
1626                 .rpc_resp = &data->c_res,
1627                 .rpc_cred = data->owner->so_cred,
1628         };
1629         struct rpc_task_setup task_setup_data = {
1630                 .rpc_client = server->client,
1631                 .rpc_message = &msg,
1632                 .callback_ops = &nfs4_open_confirm_ops,
1633                 .callback_data = data,
1634                 .workqueue = nfsiod_workqueue,
1635                 .flags = RPC_TASK_ASYNC,
1636         };
1637         int status;
1638
1639         kref_get(&data->kref);
1640         data->rpc_done = 0;
1641         data->rpc_status = 0;
1642         data->timestamp = jiffies;
1643         task = rpc_run_task(&task_setup_data);
1644         if (IS_ERR(task))
1645                 return PTR_ERR(task);
1646         status = nfs4_wait_for_completion_rpc_task(task);
1647         if (status != 0) {
1648                 data->cancelled = 1;
1649                 smp_wmb();
1650         } else
1651                 status = data->rpc_status;
1652         rpc_put_task(task);
1653         return status;
1654 }
1655
1656 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1657 {
1658         struct nfs4_opendata *data = calldata;
1659         struct nfs4_state_owner *sp = data->owner;
1660
1661         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1662                 return;
1663         /*
1664          * Check if we still need to send an OPEN call, or if we can use
1665          * a delegation instead.
1666          */
1667         if (data->state != NULL) {
1668                 struct nfs_delegation *delegation;
1669
1670                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1671                         goto out_no_action;
1672                 rcu_read_lock();
1673                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1674                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1675                     can_open_delegated(delegation, data->o_arg.fmode))
1676                         goto unlock_no_action;
1677                 rcu_read_unlock();
1678         }
1679         /* Update client id. */
1680         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1681         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1682                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1683                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1684                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1685         }
1686         data->timestamp = jiffies;
1687         if (nfs4_setup_sequence(data->o_arg.server,
1688                                 &data->o_arg.seq_args,
1689                                 &data->o_res.seq_res,
1690                                 task) != 0)
1691                 nfs_release_seqid(data->o_arg.seqid);
1692         else
1693                 rpc_call_start(task);
1694         return;
1695 unlock_no_action:
1696         rcu_read_unlock();
1697 out_no_action:
1698         task->tk_action = NULL;
1699
1700 }
1701
1702 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1703 {
1704         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1705         nfs4_open_prepare(task, calldata);
1706 }
1707
1708 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1709 {
1710         struct nfs4_opendata *data = calldata;
1711
1712         data->rpc_status = task->tk_status;
1713
1714         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1715                 return;
1716
1717         if (task->tk_status == 0) {
1718                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1719                         switch (data->o_res.f_attr->mode & S_IFMT) {
1720                         case S_IFREG:
1721                                 break;
1722                         case S_IFLNK:
1723                                 data->rpc_status = -ELOOP;
1724                                 break;
1725                         case S_IFDIR:
1726                                 data->rpc_status = -EISDIR;
1727                                 break;
1728                         default:
1729                                 data->rpc_status = -ENOTDIR;
1730                         }
1731                 }
1732                 renew_lease(data->o_res.server, data->timestamp);
1733                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1734                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1735         }
1736         data->rpc_done = 1;
1737 }
1738
1739 static void nfs4_open_release(void *calldata)
1740 {
1741         struct nfs4_opendata *data = calldata;
1742         struct nfs4_state *state = NULL;
1743
1744         /* If this request hasn't been cancelled, do nothing */
1745         if (data->cancelled == 0)
1746                 goto out_free;
1747         /* In case of error, no cleanup! */
1748         if (data->rpc_status != 0 || !data->rpc_done)
1749                 goto out_free;
1750         /* In case we need an open_confirm, no cleanup! */
1751         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1752                 goto out_free;
1753         state = nfs4_opendata_to_nfs4_state(data);
1754         if (!IS_ERR(state))
1755                 nfs4_close_state(state, data->o_arg.fmode);
1756 out_free:
1757         nfs4_opendata_put(data);
1758 }
1759
1760 static const struct rpc_call_ops nfs4_open_ops = {
1761         .rpc_call_prepare = nfs4_open_prepare,
1762         .rpc_call_done = nfs4_open_done,
1763         .rpc_release = nfs4_open_release,
1764 };
1765
1766 static const struct rpc_call_ops nfs4_recover_open_ops = {
1767         .rpc_call_prepare = nfs4_recover_open_prepare,
1768         .rpc_call_done = nfs4_open_done,
1769         .rpc_release = nfs4_open_release,
1770 };
1771
1772 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1773 {
1774         struct inode *dir = data->dir->d_inode;
1775         struct nfs_server *server = NFS_SERVER(dir);
1776         struct nfs_openargs *o_arg = &data->o_arg;
1777         struct nfs_openres *o_res = &data->o_res;
1778         struct rpc_task *task;
1779         struct rpc_message msg = {
1780                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1781                 .rpc_argp = o_arg,
1782                 .rpc_resp = o_res,
1783                 .rpc_cred = data->owner->so_cred,
1784         };
1785         struct rpc_task_setup task_setup_data = {
1786                 .rpc_client = server->client,
1787                 .rpc_message = &msg,
1788                 .callback_ops = &nfs4_open_ops,
1789                 .callback_data = data,
1790                 .workqueue = nfsiod_workqueue,
1791                 .flags = RPC_TASK_ASYNC,
1792         };
1793         int status;
1794
1795         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1796         kref_get(&data->kref);
1797         data->rpc_done = 0;
1798         data->rpc_status = 0;
1799         data->cancelled = 0;
1800         if (isrecover)
1801                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1802         task = rpc_run_task(&task_setup_data);
1803         if (IS_ERR(task))
1804                 return PTR_ERR(task);
1805         status = nfs4_wait_for_completion_rpc_task(task);
1806         if (status != 0) {
1807                 data->cancelled = 1;
1808                 smp_wmb();
1809         } else
1810                 status = data->rpc_status;
1811         rpc_put_task(task);
1812
1813         return status;
1814 }
1815
1816 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1817 {
1818         struct inode *dir = data->dir->d_inode;
1819         struct nfs_openres *o_res = &data->o_res;
1820         int status;
1821
1822         status = nfs4_run_open_task(data, 1);
1823         if (status != 0 || !data->rpc_done)
1824                 return status;
1825
1826         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1827
1828         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1829                 status = _nfs4_proc_open_confirm(data);
1830                 if (status != 0)
1831                         return status;
1832         }
1833
1834         return status;
1835 }
1836
1837 static int nfs4_opendata_access(struct rpc_cred *cred,
1838                                 struct nfs4_opendata *opendata,
1839                                 struct nfs4_state *state, fmode_t fmode)
1840 {
1841         struct nfs_access_entry cache;
1842         u32 mask;
1843
1844         /* access call failed or for some reason the server doesn't
1845          * support any access modes -- defer access call until later */
1846         if (opendata->o_res.access_supported == 0)
1847                 return 0;
1848
1849         mask = 0;
1850         /* don't check MAY_WRITE - a newly created file may not have
1851          * write mode bits, but POSIX allows the creating process to write */
1852         if (fmode & FMODE_READ)
1853                 mask |= MAY_READ;
1854         if (fmode & FMODE_EXEC)
1855                 mask |= MAY_EXEC;
1856
1857         cache.cred = cred;
1858         cache.jiffies = jiffies;
1859         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1860         nfs_access_add_cache(state->inode, &cache);
1861
1862         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1863                 return 0;
1864
1865         /* even though OPEN succeeded, access is denied. Close the file */
1866         nfs4_close_state(state, fmode);
1867         return -EACCES;
1868 }
1869
1870 /*
1871  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1872  */
1873 static int _nfs4_proc_open(struct nfs4_opendata *data)
1874 {
1875         struct inode *dir = data->dir->d_inode;
1876         struct nfs_server *server = NFS_SERVER(dir);
1877         struct nfs_openargs *o_arg = &data->o_arg;
1878         struct nfs_openres *o_res = &data->o_res;
1879         int status;
1880
1881         status = nfs4_run_open_task(data, 0);
1882         if (!data->rpc_done)
1883                 return status;
1884         if (status != 0) {
1885                 if (status == -NFS4ERR_BADNAME &&
1886                                 !(o_arg->open_flags & O_CREAT))
1887                         return -ENOENT;
1888                 return status;
1889         }
1890
1891         nfs_fattr_map_and_free_names(server, &data->f_attr);
1892
1893         if (o_arg->open_flags & O_CREAT)
1894                 update_changeattr(dir, &o_res->cinfo);
1895         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1896                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1897         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1898                 status = _nfs4_proc_open_confirm(data);
1899                 if (status != 0)
1900                         return status;
1901         }
1902         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1903                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1904         return 0;
1905 }
1906
1907 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1908 {
1909         unsigned int loop;
1910         int ret;
1911
1912         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1913                 ret = nfs4_wait_clnt_recover(clp);
1914                 if (ret != 0)
1915                         break;
1916                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1917                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1918                         break;
1919                 nfs4_schedule_state_manager(clp);
1920                 ret = -EIO;
1921         }
1922         return ret;
1923 }
1924
1925 static int nfs4_recover_expired_lease(struct nfs_server *server)
1926 {
1927         return nfs4_client_recover_expired_lease(server->nfs_client);
1928 }
1929
1930 /*
1931  * OPEN_EXPIRED:
1932  *      reclaim state on the server after a network partition.
1933  *      Assumes caller holds the appropriate lock
1934  */
1935 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1936 {
1937         struct nfs4_opendata *opendata;
1938         int ret;
1939
1940         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1941         if (IS_ERR(opendata))
1942                 return PTR_ERR(opendata);
1943         ret = nfs4_open_recover(opendata, state);
1944         if (ret == -ESTALE)
1945                 d_drop(ctx->dentry);
1946         nfs4_opendata_put(opendata);
1947         return ret;
1948 }
1949
1950 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1951 {
1952         struct nfs_server *server = NFS_SERVER(state->inode);
1953         struct nfs4_exception exception = { };
1954         int err;
1955
1956         do {
1957                 err = _nfs4_open_expired(ctx, state);
1958                 switch (err) {
1959                 default:
1960                         goto out;
1961                 case -NFS4ERR_GRACE:
1962                 case -NFS4ERR_DELAY:
1963                         nfs4_handle_exception(server, err, &exception);
1964                         err = 0;
1965                 }
1966         } while (exception.retry);
1967 out:
1968         return err;
1969 }
1970
1971 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1972 {
1973         struct nfs_open_context *ctx;
1974         int ret;
1975
1976         ctx = nfs4_state_find_open_context(state);
1977         if (IS_ERR(ctx))
1978                 return PTR_ERR(ctx);
1979         ret = nfs4_do_open_expired(ctx, state);
1980         put_nfs_open_context(ctx);
1981         return ret;
1982 }
1983
1984 #if defined(CONFIG_NFS_V4_1)
1985 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1986 {
1987         struct nfs_server *server = NFS_SERVER(state->inode);
1988         nfs4_stateid *stateid = &state->stateid;
1989         int status;
1990
1991         /* If a state reset has been done, test_stateid is unneeded */
1992         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1993                 return;
1994
1995         status = nfs41_test_stateid(server, stateid);
1996         if (status != NFS_OK) {
1997                 /* Free the stateid unless the server explicitly
1998                  * informs us the stateid is unrecognized. */
1999                 if (status != -NFS4ERR_BAD_STATEID)
2000                         nfs41_free_stateid(server, stateid);
2001                 nfs_remove_bad_delegation(state->inode);
2002
2003                 write_seqlock(&state->seqlock);
2004                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2005                 write_sequnlock(&state->seqlock);
2006                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
2007         }
2008 }
2009
2010 /**
2011  * nfs41_check_open_stateid - possibly free an open stateid
2012  *
2013  * @state: NFSv4 state for an inode
2014  *
2015  * Returns NFS_OK if recovery for this stateid is now finished.
2016  * Otherwise a negative NFS4ERR value is returned.
2017  */
2018 static int nfs41_check_open_stateid(struct nfs4_state *state)
2019 {
2020         struct nfs_server *server = NFS_SERVER(state->inode);
2021         nfs4_stateid *stateid = &state->open_stateid;
2022         int status;
2023
2024         /* If a state reset has been done, test_stateid is unneeded */
2025         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2026             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2027             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2028                 return -NFS4ERR_BAD_STATEID;
2029
2030         status = nfs41_test_stateid(server, stateid);
2031         if (status != NFS_OK) {
2032                 /* Free the stateid unless the server explicitly
2033                  * informs us the stateid is unrecognized. */
2034                 if (status != -NFS4ERR_BAD_STATEID)
2035                         nfs41_free_stateid(server, stateid);
2036
2037                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2038                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2039                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2040         }
2041         return status;
2042 }
2043
2044 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2045 {
2046         int status;
2047
2048         nfs41_clear_delegation_stateid(state);
2049         status = nfs41_check_open_stateid(state);
2050         if (status != NFS_OK)
2051                 status = nfs4_open_expired(sp, state);
2052         return status;
2053 }
2054 #endif
2055
2056 /*
2057  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2058  * fields corresponding to attributes that were used to store the verifier.
2059  * Make sure we clobber those fields in the later setattr call
2060  */
2061 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2062 {
2063         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2064             !(sattr->ia_valid & ATTR_ATIME_SET))
2065                 sattr->ia_valid |= ATTR_ATIME;
2066
2067         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2068             !(sattr->ia_valid & ATTR_MTIME_SET))
2069                 sattr->ia_valid |= ATTR_MTIME;
2070 }
2071
2072 /*
2073  * Returns a referenced nfs4_state
2074  */
2075 static int _nfs4_do_open(struct inode *dir,
2076                         struct dentry *dentry,
2077                         fmode_t fmode,
2078                         int flags,
2079                         struct iattr *sattr,
2080                         struct rpc_cred *cred,
2081                         struct nfs4_state **res,
2082                         struct nfs4_threshold **ctx_th)
2083 {
2084         struct nfs4_state_owner  *sp;
2085         struct nfs4_state     *state = NULL;
2086         struct nfs_server       *server = NFS_SERVER(dir);
2087         struct nfs4_opendata *opendata;
2088         int status;
2089
2090         /* Protect against reboot recovery conflicts */
2091         status = -ENOMEM;
2092         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2093         if (sp == NULL) {
2094                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2095                 goto out_err;
2096         }
2097         status = nfs4_recover_expired_lease(server);
2098         if (status != 0)
2099                 goto err_put_state_owner;
2100         if (dentry->d_inode != NULL)
2101                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2102         status = -ENOMEM;
2103         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
2104         if (opendata == NULL)
2105                 goto err_put_state_owner;
2106
2107         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2108                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2109                 if (!opendata->f_attr.mdsthreshold)
2110                         goto err_opendata_put;
2111                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2112         }
2113         if (dentry->d_inode != NULL)
2114                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2115
2116         status = _nfs4_proc_open(opendata);
2117         if (status != 0)
2118                 goto err_opendata_put;
2119
2120         state = nfs4_opendata_to_nfs4_state(opendata);
2121         status = PTR_ERR(state);
2122         if (IS_ERR(state))
2123                 goto err_opendata_put;
2124         if (server->caps & NFS_CAP_POSIX_LOCK)
2125                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2126
2127         status = nfs4_opendata_access(cred, opendata, state, fmode);
2128         if (status != 0)
2129                 goto err_opendata_put;
2130
2131         if (opendata->o_arg.open_flags & O_EXCL) {
2132                 nfs4_exclusive_attrset(opendata, sattr);
2133
2134                 nfs_fattr_init(opendata->o_res.f_attr);
2135                 status = nfs4_do_setattr(state->inode, cred,
2136                                 opendata->o_res.f_attr, sattr,
2137                                 state);
2138                 if (status == 0)
2139                         nfs_setattr_update_inode(state->inode, sattr);
2140                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2141         }
2142
2143         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2144                 *ctx_th = opendata->f_attr.mdsthreshold;
2145         else
2146                 kfree(opendata->f_attr.mdsthreshold);
2147         opendata->f_attr.mdsthreshold = NULL;
2148
2149         nfs4_opendata_put(opendata);
2150         nfs4_put_state_owner(sp);
2151         *res = state;
2152         return 0;
2153 err_opendata_put:
2154         kfree(opendata->f_attr.mdsthreshold);
2155         nfs4_opendata_put(opendata);
2156 err_put_state_owner:
2157         nfs4_put_state_owner(sp);
2158 out_err:
2159         *res = NULL;
2160         return status;
2161 }
2162
2163
2164 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2165                                         struct dentry *dentry,
2166                                         fmode_t fmode,
2167                                         int flags,
2168                                         struct iattr *sattr,
2169                                         struct rpc_cred *cred,
2170                                         struct nfs4_threshold **ctx_th)
2171 {
2172         struct nfs4_exception exception = { };
2173         struct nfs4_state *res;
2174         int status;
2175
2176         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
2177         do {
2178                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
2179                                        &res, ctx_th);
2180                 if (status == 0)
2181                         break;
2182                 /* NOTE: BAD_SEQID means the server and client disagree about the
2183                  * book-keeping w.r.t. state-changing operations
2184                  * (OPEN/CLOSE/LOCK/LOCKU...)
2185                  * It is actually a sign of a bug on the client or on the server.
2186                  *
2187                  * If we receive a BAD_SEQID error in the particular case of
2188                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2189                  * have unhashed the old state_owner for us, and that we can
2190                  * therefore safely retry using a new one. We should still warn
2191                  * the user though...
2192                  */
2193                 if (status == -NFS4ERR_BAD_SEQID) {
2194                         pr_warn_ratelimited("NFS: v4 server %s "
2195                                         " returned a bad sequence-id error!\n",
2196                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2197                         exception.retry = 1;
2198                         continue;
2199                 }
2200                 /*
2201                  * BAD_STATEID on OPEN means that the server cancelled our
2202                  * state before it received the OPEN_CONFIRM.
2203                  * Recover by retrying the request as per the discussion
2204                  * on Page 181 of RFC3530.
2205                  */
2206                 if (status == -NFS4ERR_BAD_STATEID) {
2207                         exception.retry = 1;
2208                         continue;
2209                 }
2210                 if (status == -EAGAIN) {
2211                         /* We must have found a delegation */
2212                         exception.retry = 1;
2213                         continue;
2214                 }
2215                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
2216                                         status, &exception));
2217         } while (exception.retry);
2218         return res;
2219 }
2220
2221 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2222                             struct nfs_fattr *fattr, struct iattr *sattr,
2223                             struct nfs4_state *state)
2224 {
2225         struct nfs_server *server = NFS_SERVER(inode);
2226         struct nfs_setattrargs  arg = {
2227                 .fh             = NFS_FH(inode),
2228                 .iap            = sattr,
2229                 .server         = server,
2230                 .bitmask = server->attr_bitmask,
2231         };
2232         struct nfs_setattrres  res = {
2233                 .fattr          = fattr,
2234                 .server         = server,
2235         };
2236         struct rpc_message msg = {
2237                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2238                 .rpc_argp       = &arg,
2239                 .rpc_resp       = &res,
2240                 .rpc_cred       = cred,
2241         };
2242         unsigned long timestamp = jiffies;
2243         int status;
2244
2245         nfs_fattr_init(fattr);
2246
2247         if (state != NULL) {
2248                 struct nfs_lockowner lockowner = {
2249                         .l_owner = current->files,
2250                         .l_pid = current->tgid,
2251                 };
2252                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2253                                 &lockowner);
2254         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2255                                 FMODE_WRITE)) {
2256                 /* Use that stateid */
2257         } else
2258                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2259
2260         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2261         if (status == 0 && state != NULL)
2262                 renew_lease(server, timestamp);
2263         return status;
2264 }
2265
2266 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2267                            struct nfs_fattr *fattr, struct iattr *sattr,
2268                            struct nfs4_state *state)
2269 {
2270         struct nfs_server *server = NFS_SERVER(inode);
2271         struct nfs4_exception exception = {
2272                 .state = state,
2273                 .inode = inode,
2274         };
2275         int err;
2276         do {
2277                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2278                 switch (err) {
2279                 case -NFS4ERR_OPENMODE:
2280                         if (state && !(state->state & FMODE_WRITE)) {
2281                                 err = -EBADF;
2282                                 if (sattr->ia_valid & ATTR_OPEN)
2283                                         err = -EACCES;
2284                                 goto out;
2285                         }
2286                 }
2287                 err = nfs4_handle_exception(server, err, &exception);
2288         } while (exception.retry);
2289 out:
2290         return err;
2291 }
2292
2293 struct nfs4_closedata {
2294         struct inode *inode;
2295         struct nfs4_state *state;
2296         struct nfs_closeargs arg;
2297         struct nfs_closeres res;
2298         struct nfs_fattr fattr;
2299         unsigned long timestamp;
2300         bool roc;
2301         u32 roc_barrier;
2302 };
2303
2304 static void nfs4_free_closedata(void *data)
2305 {
2306         struct nfs4_closedata *calldata = data;
2307         struct nfs4_state_owner *sp = calldata->state->owner;
2308         struct super_block *sb = calldata->state->inode->i_sb;
2309
2310         if (calldata->roc)
2311                 pnfs_roc_release(calldata->state->inode);
2312         nfs4_put_open_state(calldata->state);
2313         nfs_free_seqid(calldata->arg.seqid);
2314         nfs4_put_state_owner(sp);
2315         nfs_sb_deactive_async(sb);
2316         kfree(calldata);
2317 }
2318
2319 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2320                 fmode_t fmode)
2321 {
2322         spin_lock(&state->owner->so_lock);
2323         if (!(fmode & FMODE_READ))
2324                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2325         if (!(fmode & FMODE_WRITE))
2326                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2327         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2328         spin_unlock(&state->owner->so_lock);
2329 }
2330
2331 static void nfs4_close_done(struct rpc_task *task, void *data)
2332 {
2333         struct nfs4_closedata *calldata = data;
2334         struct nfs4_state *state = calldata->state;
2335         struct nfs_server *server = NFS_SERVER(calldata->inode);
2336
2337         dprintk("%s: begin!\n", __func__);
2338         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2339                 return;
2340         /* hmm. we are done with the inode, and in the process of freeing
2341          * the state_owner. we keep this around to process errors
2342          */
2343         switch (task->tk_status) {
2344                 case 0:
2345                         if (calldata->roc)
2346                                 pnfs_roc_set_barrier(state->inode,
2347                                                      calldata->roc_barrier);
2348                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2349                         renew_lease(server, calldata->timestamp);
2350                         nfs4_close_clear_stateid_flags(state,
2351                                         calldata->arg.fmode);
2352                         break;
2353                 case -NFS4ERR_STALE_STATEID:
2354                 case -NFS4ERR_OLD_STATEID:
2355                 case -NFS4ERR_BAD_STATEID:
2356                 case -NFS4ERR_EXPIRED:
2357                         if (calldata->arg.fmode == 0)
2358                                 break;
2359                 default:
2360                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2361                                 rpc_restart_call_prepare(task);
2362         }
2363         nfs_release_seqid(calldata->arg.seqid);
2364         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2365         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2366 }
2367
2368 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2369 {
2370         struct nfs4_closedata *calldata = data;
2371         struct nfs4_state *state = calldata->state;
2372         struct inode *inode = calldata->inode;
2373         int call_close = 0;
2374
2375         dprintk("%s: begin!\n", __func__);
2376         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2377                 return;
2378
2379         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2380         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2381         spin_lock(&state->owner->so_lock);
2382         /* Calculate the change in open mode */
2383         if (state->n_rdwr == 0) {
2384                 if (state->n_rdonly == 0) {
2385                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2386                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2387                         calldata->arg.fmode &= ~FMODE_READ;
2388                 }
2389                 if (state->n_wronly == 0) {
2390                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2391                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2392                         calldata->arg.fmode &= ~FMODE_WRITE;
2393                 }
2394         }
2395         spin_unlock(&state->owner->so_lock);
2396
2397         if (!call_close) {
2398                 /* Note: exit _without_ calling nfs4_close_done */
2399                 task->tk_action = NULL;
2400                 goto out;
2401         }
2402
2403         if (calldata->arg.fmode == 0) {
2404                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2405                 if (calldata->roc &&
2406                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2407                         goto out;
2408         }
2409
2410         nfs_fattr_init(calldata->res.fattr);
2411         calldata->timestamp = jiffies;
2412         if (nfs4_setup_sequence(NFS_SERVER(inode),
2413                                 &calldata->arg.seq_args,
2414                                 &calldata->res.seq_res,
2415                                 task) != 0)
2416                 nfs_release_seqid(calldata->arg.seqid);
2417         else
2418                 rpc_call_start(task);
2419 out:
2420         dprintk("%s: done!\n", __func__);
2421 }
2422
2423 static const struct rpc_call_ops nfs4_close_ops = {
2424         .rpc_call_prepare = nfs4_close_prepare,
2425         .rpc_call_done = nfs4_close_done,
2426         .rpc_release = nfs4_free_closedata,
2427 };
2428
2429 /*
2430  * It is possible for data to be read/written from a mem-mapped file
2431  * after the sys_close call (which hits the vfs layer as a flush).
2432  * This means that we can't safely call nfsv4 close on a file until
2433  * the inode is cleared. This in turn means that we are not good
2434  * NFSv4 citizens - we do not indicate to the server to update the file's
2435  * share state even when we are done with one of the three share
2436  * stateid's in the inode.
2437  *
2438  * NOTE: Caller must be holding the sp->so_owner semaphore!
2439  */
2440 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2441 {
2442         struct nfs_server *server = NFS_SERVER(state->inode);
2443         struct nfs4_closedata *calldata;
2444         struct nfs4_state_owner *sp = state->owner;
2445         struct rpc_task *task;
2446         struct rpc_message msg = {
2447                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2448                 .rpc_cred = state->owner->so_cred,
2449         };
2450         struct rpc_task_setup task_setup_data = {
2451                 .rpc_client = server->client,
2452                 .rpc_message = &msg,
2453                 .callback_ops = &nfs4_close_ops,
2454                 .workqueue = nfsiod_workqueue,
2455                 .flags = RPC_TASK_ASYNC,
2456         };
2457         int status = -ENOMEM;
2458
2459         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2460         if (calldata == NULL)
2461                 goto out;
2462         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2463         calldata->inode = state->inode;
2464         calldata->state = state;
2465         calldata->arg.fh = NFS_FH(state->inode);
2466         calldata->arg.stateid = &state->open_stateid;
2467         /* Serialization for the sequence id */
2468         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2469         if (calldata->arg.seqid == NULL)
2470                 goto out_free_calldata;
2471         calldata->arg.fmode = 0;
2472         calldata->arg.bitmask = server->cache_consistency_bitmask;
2473         calldata->res.fattr = &calldata->fattr;
2474         calldata->res.seqid = calldata->arg.seqid;
2475         calldata->res.server = server;
2476         calldata->roc = pnfs_roc(state->inode);
2477         nfs_sb_active(calldata->inode->i_sb);
2478
2479         msg.rpc_argp = &calldata->arg;
2480         msg.rpc_resp = &calldata->res;
2481         task_setup_data.callback_data = calldata;
2482         task = rpc_run_task(&task_setup_data);
2483         if (IS_ERR(task))
2484                 return PTR_ERR(task);
2485         status = 0;
2486         if (wait)
2487                 status = rpc_wait_for_completion_task(task);
2488         rpc_put_task(task);
2489         return status;
2490 out_free_calldata:
2491         kfree(calldata);
2492 out:
2493         nfs4_put_open_state(state);
2494         nfs4_put_state_owner(sp);
2495         return status;
2496 }
2497
2498 static struct inode *
2499 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2500 {
2501         struct nfs4_state *state;
2502
2503         /* Protect against concurrent sillydeletes */
2504         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2505                              ctx->cred, &ctx->mdsthreshold);
2506         if (IS_ERR(state))
2507                 return ERR_CAST(state);
2508         ctx->state = state;
2509         return igrab(state->inode);
2510 }
2511
2512 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2513 {
2514         if (ctx->state == NULL)
2515                 return;
2516         if (is_sync)
2517                 nfs4_close_sync(ctx->state, ctx->mode);
2518         else
2519                 nfs4_close_state(ctx->state, ctx->mode);
2520 }
2521
2522 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2523 {
2524         struct nfs4_server_caps_arg args = {
2525                 .fhandle = fhandle,
2526         };
2527         struct nfs4_server_caps_res res = {};
2528         struct rpc_message msg = {
2529                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2530                 .rpc_argp = &args,
2531                 .rpc_resp = &res,
2532         };
2533         int status;
2534
2535         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2536         if (status == 0) {
2537                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2538                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2539                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2540                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2541                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2542                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2543                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2544                         server->caps |= NFS_CAP_ACLS;
2545                 if (res.has_links != 0)
2546                         server->caps |= NFS_CAP_HARDLINKS;
2547                 if (res.has_symlinks != 0)
2548                         server->caps |= NFS_CAP_SYMLINKS;
2549                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2550                         server->caps |= NFS_CAP_FILEID;
2551                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2552                         server->caps |= NFS_CAP_MODE;
2553                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2554                         server->caps |= NFS_CAP_NLINK;
2555                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2556                         server->caps |= NFS_CAP_OWNER;
2557                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2558                         server->caps |= NFS_CAP_OWNER_GROUP;
2559                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2560                         server->caps |= NFS_CAP_ATIME;
2561                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2562                         server->caps |= NFS_CAP_CTIME;
2563                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2564                         server->caps |= NFS_CAP_MTIME;
2565
2566                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2567                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2568                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2569                 server->acl_bitmask = res.acl_bitmask;
2570                 server->fh_expire_type = res.fh_expire_type;
2571         }
2572
2573         return status;
2574 }
2575
2576 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2577 {
2578         struct nfs4_exception exception = { };
2579         int err;
2580         do {
2581                 err = nfs4_handle_exception(server,
2582                                 _nfs4_server_capabilities(server, fhandle),
2583                                 &exception);
2584         } while (exception.retry);
2585         return err;
2586 }
2587
2588 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2589                 struct nfs_fsinfo *info)
2590 {
2591         struct nfs4_lookup_root_arg args = {
2592                 .bitmask = nfs4_fattr_bitmap,
2593         };
2594         struct nfs4_lookup_res res = {
2595                 .server = server,
2596                 .fattr = info->fattr,
2597                 .fh = fhandle,
2598         };
2599         struct rpc_message msg = {
2600                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2601                 .rpc_argp = &args,
2602                 .rpc_resp = &res,
2603         };
2604
2605         nfs_fattr_init(info->fattr);
2606         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2607 }
2608
2609 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2610                 struct nfs_fsinfo *info)
2611 {
2612         struct nfs4_exception exception = { };
2613         int err;
2614         do {
2615                 err = _nfs4_lookup_root(server, fhandle, info);
2616                 switch (err) {
2617                 case 0:
2618                 case -NFS4ERR_WRONGSEC:
2619                         goto out;
2620                 default:
2621                         err = nfs4_handle_exception(server, err, &exception);
2622                 }
2623         } while (exception.retry);
2624 out:
2625         return err;
2626 }
2627
2628 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2629                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2630 {
2631         struct rpc_auth *auth;
2632         int ret;
2633
2634         auth = rpcauth_create(flavor, server->client);
2635         if (IS_ERR(auth)) {
2636                 ret = -EIO;
2637                 goto out;
2638         }
2639         ret = nfs4_lookup_root(server, fhandle, info);
2640 out:
2641         return ret;
2642 }
2643
2644 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2645                               struct nfs_fsinfo *info)
2646 {
2647         int i, len, status = 0;
2648         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2649
2650         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2651         if (len < 0)
2652                 return len;
2653
2654         for (i = 0; i < len; i++) {
2655                 /* AUTH_UNIX is the default flavor if none was specified,
2656                  * thus has already been tried. */
2657                 if (flav_array[i] == RPC_AUTH_UNIX)
2658                         continue;
2659
2660                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2661                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2662                         continue;
2663                 break;
2664         }
2665         /*
2666          * -EACCESS could mean that the user doesn't have correct permissions
2667          * to access the mount.  It could also mean that we tried to mount
2668          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2669          * existing mount programs don't handle -EACCES very well so it should
2670          * be mapped to -EPERM instead.
2671          */
2672         if (status == -EACCES)
2673                 status = -EPERM;
2674         return status;
2675 }
2676
2677 /*
2678  * get the file handle for the "/" directory on the server
2679  */
2680 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2681                          struct nfs_fsinfo *info)
2682 {
2683         int minor_version = server->nfs_client->cl_minorversion;
2684         int status = nfs4_lookup_root(server, fhandle, info);
2685         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2686                 /*
2687                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2688                  * by nfs4_map_errors() as this function exits.
2689                  */
2690                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2691         if (status == 0)
2692                 status = nfs4_server_capabilities(server, fhandle);
2693         if (status == 0)
2694                 status = nfs4_do_fsinfo(server, fhandle, info);
2695         return nfs4_map_errors(status);
2696 }
2697
2698 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2699                               struct nfs_fsinfo *info)
2700 {
2701         int error;
2702         struct nfs_fattr *fattr = info->fattr;
2703
2704         error = nfs4_server_capabilities(server, mntfh);
2705         if (error < 0) {
2706                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2707                 return error;
2708         }
2709
2710         error = nfs4_proc_getattr(server, mntfh, fattr);
2711         if (error < 0) {
2712                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2713                 return error;
2714         }
2715
2716         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2717             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2718                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2719
2720         return error;
2721 }
2722
2723 /*
2724  * Get locations and (maybe) other attributes of a referral.
2725  * Note that we'll actually follow the referral later when
2726  * we detect fsid mismatch in inode revalidation
2727  */
2728 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2729                              const struct qstr *name, struct nfs_fattr *fattr,
2730                              struct nfs_fh *fhandle)
2731 {
2732         int status = -ENOMEM;
2733         struct page *page = NULL;
2734         struct nfs4_fs_locations *locations = NULL;
2735
2736         page = alloc_page(GFP_KERNEL);
2737         if (page == NULL)
2738                 goto out;
2739         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2740         if (locations == NULL)
2741                 goto out;
2742
2743         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2744         if (status != 0)
2745                 goto out;
2746         /* Make sure server returned a different fsid for the referral */
2747         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2748                 dprintk("%s: server did not return a different fsid for"
2749                         " a referral at %s\n", __func__, name->name);
2750                 status = -EIO;
2751                 goto out;
2752         }
2753         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2754         nfs_fixup_referral_attributes(&locations->fattr);
2755
2756         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2757         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2758         memset(fhandle, 0, sizeof(struct nfs_fh));
2759 out:
2760         if (page)
2761                 __free_page(page);
2762         kfree(locations);
2763         return status;
2764 }
2765
2766 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2767 {
2768         struct nfs4_getattr_arg args = {
2769                 .fh = fhandle,
2770                 .bitmask = server->attr_bitmask,
2771         };
2772         struct nfs4_getattr_res res = {
2773                 .fattr = fattr,
2774                 .server = server,
2775         };
2776         struct rpc_message msg = {
2777                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2778                 .rpc_argp = &args,
2779                 .rpc_resp = &res,
2780         };
2781
2782         nfs_fattr_init(fattr);
2783         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2784 }
2785
2786 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2787 {
2788         struct nfs4_exception exception = { };
2789         int err;
2790         do {
2791                 err = nfs4_handle_exception(server,
2792                                 _nfs4_proc_getattr(server, fhandle, fattr),
2793                                 &exception);
2794         } while (exception.retry);
2795         return err;
2796 }
2797
2798 /*
2799  * The file is not closed if it is opened due to the a request to change
2800  * the size of the file. The open call will not be needed once the
2801  * VFS layer lookup-intents are implemented.
2802  *
2803  * Close is called when the inode is destroyed.
2804  * If we haven't opened the file for O_WRONLY, we
2805  * need to in the size_change case to obtain a stateid.
2806  *
2807  * Got race?
2808  * Because OPEN is always done by name in nfsv4, it is
2809  * possible that we opened a different file by the same
2810  * name.  We can recognize this race condition, but we
2811  * can't do anything about it besides returning an error.
2812  *
2813  * This will be fixed with VFS changes (lookup-intent).
2814  */
2815 static int
2816 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2817                   struct iattr *sattr)
2818 {
2819         struct inode *inode = dentry->d_inode;
2820         struct rpc_cred *cred = NULL;
2821         struct nfs4_state *state = NULL;
2822         int status;
2823
2824         if (pnfs_ld_layoutret_on_setattr(inode))
2825                 pnfs_return_layout(inode);
2826
2827         nfs_fattr_init(fattr);
2828
2829         /* Deal with open(O_TRUNC) */
2830         if (sattr->ia_valid & ATTR_OPEN)
2831                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2832
2833         /* Optimization: if the end result is no change, don't RPC */
2834         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2835                 return 0;
2836
2837         /* Search for an existing open(O_WRITE) file */
2838         if (sattr->ia_valid & ATTR_FILE) {
2839                 struct nfs_open_context *ctx;
2840
2841                 ctx = nfs_file_open_context(sattr->ia_file);
2842                 if (ctx) {
2843                         cred = ctx->cred;
2844                         state = ctx->state;
2845                 }
2846         }
2847
2848         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2849         if (status == 0)
2850                 nfs_setattr_update_inode(inode, sattr);
2851         return status;
2852 }
2853
2854 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2855                 const struct qstr *name, struct nfs_fh *fhandle,
2856                 struct nfs_fattr *fattr)
2857 {
2858         struct nfs_server *server = NFS_SERVER(dir);
2859         int                    status;
2860         struct nfs4_lookup_arg args = {
2861                 .bitmask = server->attr_bitmask,
2862                 .dir_fh = NFS_FH(dir),
2863                 .name = name,
2864         };
2865         struct nfs4_lookup_res res = {
2866                 .server = server,
2867                 .fattr = fattr,
2868                 .fh = fhandle,
2869         };
2870         struct rpc_message msg = {
2871                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2872                 .rpc_argp = &args,
2873                 .rpc_resp = &res,
2874         };
2875
2876         nfs_fattr_init(fattr);
2877
2878         dprintk("NFS call  lookup %s\n", name->name);
2879         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2880         dprintk("NFS reply lookup: %d\n", status);
2881         return status;
2882 }
2883
2884 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2885 {
2886         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2887                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2888         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2889         fattr->nlink = 2;
2890 }
2891
2892 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2893                                    struct qstr *name, struct nfs_fh *fhandle,
2894                                    struct nfs_fattr *fattr)
2895 {
2896         struct nfs4_exception exception = { };
2897         struct rpc_clnt *client = *clnt;
2898         int err;
2899         do {
2900                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2901                 switch (err) {
2902                 case -NFS4ERR_BADNAME:
2903                         err = -ENOENT;
2904                         goto out;
2905                 case -NFS4ERR_MOVED:
2906                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2907                         goto out;
2908                 case -NFS4ERR_WRONGSEC:
2909                         err = -EPERM;
2910                         if (client != *clnt)
2911                                 goto out;
2912
2913                         client = nfs4_create_sec_client(client, dir, name);
2914                         if (IS_ERR(client))
2915                                 return PTR_ERR(client);
2916
2917                         exception.retry = 1;
2918                         break;
2919                 default:
2920                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2921                 }
2922         } while (exception.retry);
2923
2924 out:
2925         if (err == 0)
2926                 *clnt = client;
2927         else if (client != *clnt)
2928                 rpc_shutdown_client(client);
2929
2930         return err;
2931 }
2932
2933 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2934                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2935 {
2936         int status;
2937         struct rpc_clnt *client = NFS_CLIENT(dir);
2938
2939         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2940         if (client != NFS_CLIENT(dir)) {
2941                 rpc_shutdown_client(client);
2942                 nfs_fixup_secinfo_attributes(fattr);
2943         }
2944         return status;
2945 }
2946
2947 struct rpc_clnt *
2948 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2949                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2950 {
2951         int status;
2952         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2953
2954         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2955         if (status < 0) {
2956                 rpc_shutdown_client(client);
2957                 return ERR_PTR(status);
2958         }
2959         return client;
2960 }
2961
2962 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2963 {
2964         struct nfs_server *server = NFS_SERVER(inode);
2965         struct nfs4_accessargs args = {
2966                 .fh = NFS_FH(inode),
2967                 .bitmask = server->cache_consistency_bitmask,
2968         };
2969         struct nfs4_accessres res = {
2970                 .server = server,
2971         };
2972         struct rpc_message msg = {
2973                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2974                 .rpc_argp = &args,
2975                 .rpc_resp = &res,
2976                 .rpc_cred = entry->cred,
2977         };
2978         int mode = entry->mask;
2979         int status;
2980
2981         /*
2982          * Determine which access bits we want to ask for...
2983          */
2984         if (mode & MAY_READ)
2985                 args.access |= NFS4_ACCESS_READ;
2986         if (S_ISDIR(inode->i_mode)) {
2987                 if (mode & MAY_WRITE)
2988                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2989                 if (mode & MAY_EXEC)
2990                         args.access |= NFS4_ACCESS_LOOKUP;
2991         } else {
2992                 if (mode & MAY_WRITE)
2993                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2994                 if (mode & MAY_EXEC)
2995                         args.access |= NFS4_ACCESS_EXECUTE;
2996         }
2997
2998         res.fattr = nfs_alloc_fattr();
2999         if (res.fattr == NULL)
3000                 return -ENOMEM;
3001
3002         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3003         if (!status) {
3004                 nfs_access_set_mask(entry, res.access);
3005                 nfs_refresh_inode(inode, res.fattr);
3006         }
3007         nfs_free_fattr(res.fattr);
3008         return status;
3009 }
3010
3011 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3012 {
3013         struct nfs4_exception exception = { };
3014         int err;
3015         do {
3016                 err = nfs4_handle_exception(NFS_SERVER(inode),
3017                                 _nfs4_proc_access(inode, entry),
3018                                 &exception);
3019         } while (exception.retry);
3020         return err;
3021 }
3022
3023 /*
3024  * TODO: For the time being, we don't try to get any attributes
3025  * along with any of the zero-copy operations READ, READDIR,
3026  * READLINK, WRITE.
3027  *
3028  * In the case of the first three, we want to put the GETATTR
3029  * after the read-type operation -- this is because it is hard
3030  * to predict the length of a GETATTR response in v4, and thus
3031  * align the READ data correctly.  This means that the GETATTR
3032  * may end up partially falling into the page cache, and we should
3033  * shift it into the 'tail' of the xdr_buf before processing.
3034  * To do this efficiently, we need to know the total length
3035  * of data received, which doesn't seem to be available outside
3036  * of the RPC layer.
3037  *
3038  * In the case of WRITE, we also want to put the GETATTR after
3039  * the operation -- in this case because we want to make sure
3040  * we get the post-operation mtime and size.
3041  *
3042  * Both of these changes to the XDR layer would in fact be quite
3043  * minor, but I decided to leave them for a subsequent patch.
3044  */
3045 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3046                 unsigned int pgbase, unsigned int pglen)
3047 {
3048         struct nfs4_readlink args = {
3049                 .fh       = NFS_FH(inode),
3050                 .pgbase   = pgbase,
3051                 .pglen    = pglen,
3052                 .pages    = &page,
3053         };
3054         struct nfs4_readlink_res res;
3055         struct rpc_message msg = {
3056                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3057                 .rpc_argp = &args,
3058                 .rpc_resp = &res,
3059         };
3060
3061         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3062 }
3063
3064 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3065                 unsigned int pgbase, unsigned int pglen)
3066 {
3067         struct nfs4_exception exception = { };
3068         int err;
3069         do {
3070                 err = nfs4_handle_exception(NFS_SERVER(inode),
3071                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
3072                                 &exception);
3073         } while (exception.retry);
3074         return err;
3075 }
3076
3077 /*
3078  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3079  */
3080 static int
3081 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3082                  int flags)
3083 {
3084         struct nfs_open_context *ctx;
3085         struct nfs4_state *state;
3086         int status = 0;
3087
3088         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3089         if (IS_ERR(ctx))
3090                 return PTR_ERR(ctx);
3091
3092         sattr->ia_mode &= ~current_umask();
3093         state = nfs4_do_open(dir, dentry, ctx->mode,
3094                         flags, sattr, ctx->cred,
3095                         &ctx->mdsthreshold);
3096         d_drop(dentry);
3097         if (IS_ERR(state)) {
3098                 status = PTR_ERR(state);
3099                 goto out;
3100         }
3101         d_add(dentry, igrab(state->inode));
3102         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
3103         ctx->state = state;
3104 out:
3105         put_nfs_open_context(ctx);
3106         return status;
3107 }
3108
3109 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3110 {
3111         struct nfs_server *server = NFS_SERVER(dir);
3112         struct nfs_removeargs args = {
3113                 .fh = NFS_FH(dir),
3114                 .name = *name,
3115         };
3116         struct nfs_removeres res = {
3117                 .server = server,
3118         };
3119         struct rpc_message msg = {
3120                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3121                 .rpc_argp = &args,
3122                 .rpc_resp = &res,
3123         };
3124         int status;
3125
3126         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3127         if (status == 0)
3128                 update_changeattr(dir, &res.cinfo);
3129         return status;
3130 }
3131
3132 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3133 {
3134         struct nfs4_exception exception = { };
3135         int err;
3136         do {
3137                 err = nfs4_handle_exception(NFS_SERVER(dir),
3138                                 _nfs4_proc_remove(dir, name),
3139                                 &exception);
3140         } while (exception.retry);
3141         return err;
3142 }
3143
3144 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3145 {
3146         struct nfs_server *server = NFS_SERVER(dir);
3147         struct nfs_removeargs *args = msg->rpc_argp;
3148         struct nfs_removeres *res = msg->rpc_resp;
3149
3150         res->server = server;
3151         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3152         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3153 }
3154
3155 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3156 {
3157         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
3158                                 &data->args.seq_args,
3159                                 &data->res.seq_res,
3160                                 task))
3161                 return;
3162         rpc_call_start(task);
3163 }
3164
3165 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3166 {
3167         struct nfs_removeres *res = task->tk_msg.rpc_resp;
3168
3169         if (!nfs4_sequence_done(task, &res->seq_res))
3170                 return 0;
3171         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3172                 return 0;
3173         update_changeattr(dir, &res->cinfo);
3174         return 1;
3175 }
3176
3177 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3178 {
3179         struct nfs_server *server = NFS_SERVER(dir);
3180         struct nfs_renameargs *arg = msg->rpc_argp;
3181         struct nfs_renameres *res = msg->rpc_resp;
3182
3183         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3184         res->server = server;
3185         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3186 }
3187
3188 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3189 {
3190         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3191                                 &data->args.seq_args,
3192                                 &data->res.seq_res,
3193                                 task))
3194                 return;
3195         rpc_call_start(task);
3196 }
3197
3198 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3199                                  struct inode *new_dir)
3200 {
3201         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3202
3203         if (!nfs4_sequence_done(task, &res->seq_res))
3204                 return 0;
3205         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3206                 return 0;
3207
3208         update_changeattr(old_dir, &res->old_cinfo);
3209         update_changeattr(new_dir, &res->new_cinfo);
3210         return 1;
3211 }
3212
3213 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3214                 struct inode *new_dir, struct qstr *new_name)
3215 {
3216         struct nfs_server *server = NFS_SERVER(old_dir);
3217         struct nfs_renameargs arg = {
3218                 .old_dir = NFS_FH(old_dir),
3219                 .new_dir = NFS_FH(new_dir),
3220                 .old_name = old_name,
3221                 .new_name = new_name,
3222         };
3223         struct nfs_renameres res = {
3224                 .server = server,
3225         };
3226         struct rpc_message msg = {
3227                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3228                 .rpc_argp = &arg,
3229                 .rpc_resp = &res,
3230         };
3231         int status = -ENOMEM;
3232
3233         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3234         if (!status) {
3235                 update_changeattr(old_dir, &res.old_cinfo);
3236                 update_changeattr(new_dir, &res.new_cinfo);
3237         }
3238         return status;
3239 }
3240
3241 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3242                 struct inode *new_dir, struct qstr *new_name)
3243 {
3244         struct nfs4_exception exception = { };
3245         int err;
3246         do {
3247                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3248                                 _nfs4_proc_rename(old_dir, old_name,
3249                                         new_dir, new_name),
3250                                 &exception);
3251         } while (exception.retry);
3252         return err;
3253 }
3254
3255 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3256 {
3257         struct nfs_server *server = NFS_SERVER(inode);
3258         struct nfs4_link_arg arg = {
3259                 .fh     = NFS_FH(inode),
3260                 .dir_fh = NFS_FH(dir),
3261                 .name   = name,
3262                 .bitmask = server->attr_bitmask,
3263         };
3264         struct nfs4_link_res res = {
3265                 .server = server,
3266         };
3267         struct rpc_message msg = {
3268                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3269                 .rpc_argp = &arg,
3270                 .rpc_resp = &res,
3271         };
3272         int status = -ENOMEM;
3273
3274         res.fattr = nfs_alloc_fattr();
3275         if (res.fattr == NULL)
3276                 goto out;
3277
3278         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3279         if (!status) {
3280                 update_changeattr(dir, &res.cinfo);
3281                 nfs_post_op_update_inode(inode, res.fattr);
3282         }
3283 out:
3284         nfs_free_fattr(res.fattr);
3285         return status;
3286 }
3287
3288 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3289 {
3290         struct nfs4_exception exception = { };
3291         int err;
3292         do {
3293                 err = nfs4_handle_exception(NFS_SERVER(inode),
3294                                 _nfs4_proc_link(inode, dir, name),
3295                                 &exception);
3296         } while (exception.retry);
3297         return err;
3298 }
3299
3300 struct nfs4_createdata {
3301         struct rpc_message msg;
3302         struct nfs4_create_arg arg;
3303         struct nfs4_create_res res;
3304         struct nfs_fh fh;
3305         struct nfs_fattr fattr;
3306 };
3307
3308 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3309                 struct qstr *name, struct iattr *sattr, u32 ftype)
3310 {
3311         struct nfs4_createdata *data;
3312
3313         data = kzalloc(sizeof(*data), GFP_KERNEL);
3314         if (data != NULL) {
3315                 struct nfs_server *server = NFS_SERVER(dir);
3316
3317                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3318                 data->msg.rpc_argp = &data->arg;
3319                 data->msg.rpc_resp = &data->res;
3320                 data->arg.dir_fh = NFS_FH(dir);
3321                 data->arg.server = server;
3322                 data->arg.name = name;
3323                 data->arg.attrs = sattr;
3324                 data->arg.ftype = ftype;
3325                 data->arg.bitmask = server->attr_bitmask;
3326                 data->res.server = server;
3327                 data->res.fh = &data->fh;
3328                 data->res.fattr = &data->fattr;
3329                 nfs_fattr_init(data->res.fattr);
3330         }
3331         return data;
3332 }
3333
3334 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3335 {
3336         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3337                                     &data->arg.seq_args, &data->res.seq_res, 1);
3338         if (status == 0) {
3339                 update_changeattr(dir, &data->res.dir_cinfo);
3340                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3341         }
3342         return status;
3343 }
3344
3345 static void nfs4_free_createdata(struct nfs4_createdata *data)
3346 {
3347         kfree(data);
3348 }
3349
3350 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3351                 struct page *page, unsigned int len, struct iattr *sattr)
3352 {
3353         struct nfs4_createdata *data;
3354         int status = -ENAMETOOLONG;
3355
3356         if (len > NFS4_MAXPATHLEN)
3357                 goto out;
3358
3359         status = -ENOMEM;
3360         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3361         if (data == NULL)
3362                 goto out;
3363
3364         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3365         data->arg.u.symlink.pages = &page;
3366         data->arg.u.symlink.len = len;
3367
3368         status = nfs4_do_create(dir, dentry, data);
3369
3370         nfs4_free_createdata(data);
3371 out:
3372         return status;
3373 }
3374
3375 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3376                 struct page *page, unsigned int len, struct iattr *sattr)
3377 {
3378         struct nfs4_exception exception = { };
3379         int err;
3380         do {
3381                 err = nfs4_handle_exception(NFS_SERVER(dir),
3382                                 _nfs4_proc_symlink(dir, dentry, page,
3383                                                         len, sattr),
3384                                 &exception);
3385         } while (exception.retry);
3386         return err;
3387 }
3388
3389 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3390                 struct iattr *sattr)
3391 {
3392         struct nfs4_createdata *data;
3393         int status = -ENOMEM;
3394
3395         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3396         if (data == NULL)
3397                 goto out;
3398
3399         status = nfs4_do_create(dir, dentry, data);
3400
3401         nfs4_free_createdata(data);
3402 out:
3403         return status;
3404 }
3405
3406 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3407                 struct iattr *sattr)
3408 {
3409         struct nfs4_exception exception = { };
3410         int err;
3411
3412         sattr->ia_mode &= ~current_umask();
3413         do {
3414                 err = nfs4_handle_exception(NFS_SERVER(dir),
3415                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3416                                 &exception);
3417         } while (exception.retry);
3418         return err;
3419 }
3420
3421 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3422                 u64 cookie, struct page **pages, unsigned int count, int plus)
3423 {
3424         struct inode            *dir = dentry->d_inode;
3425         struct nfs4_readdir_arg args = {
3426                 .fh = NFS_FH(dir),
3427                 .pages = pages,
3428                 .pgbase = 0,
3429                 .count = count,
3430                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3431                 .plus = plus,
3432         };
3433         struct nfs4_readdir_res res;
3434         struct rpc_message msg = {
3435                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3436                 .rpc_argp = &args,
3437                 .rpc_resp = &res,
3438                 .rpc_cred = cred,
3439         };
3440         int                     status;
3441
3442         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3443                         dentry->d_parent->d_name.name,
3444                         dentry->d_name.name,
3445                         (unsigned long long)cookie);
3446         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3447         res.pgbase = args.pgbase;
3448         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3449         if (status >= 0) {
3450                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3451                 status += args.pgbase;
3452         }
3453
3454         nfs_invalidate_atime(dir);
3455
3456         dprintk("%s: returns %d\n", __func__, status);
3457         return status;
3458 }
3459
3460 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3461                 u64 cookie, struct page **pages, unsigned int count, int plus)
3462 {
3463         struct nfs4_exception exception = { };
3464         int err;
3465         do {
3466                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3467                                 _nfs4_proc_readdir(dentry, cred, cookie,
3468                                         pages, count, plus),
3469                                 &exception);
3470         } while (exception.retry);
3471         return err;
3472 }
3473
3474 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3475                 struct iattr *sattr, dev_t rdev)
3476 {
3477         struct nfs4_createdata *data;
3478         int mode = sattr->ia_mode;
3479         int status = -ENOMEM;
3480
3481         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3482         if (data == NULL)
3483                 goto out;
3484
3485         if (S_ISFIFO(mode))
3486                 data->arg.ftype = NF4FIFO;
3487         else if (S_ISBLK(mode)) {
3488                 data->arg.ftype = NF4BLK;
3489                 data->arg.u.device.specdata1 = MAJOR(rdev);
3490                 data->arg.u.device.specdata2 = MINOR(rdev);
3491         }
3492         else if (S_ISCHR(mode)) {
3493                 data->arg.ftype = NF4CHR;
3494                 data->arg.u.device.specdata1 = MAJOR(rdev);
3495                 data->arg.u.device.specdata2 = MINOR(rdev);
3496         } else if (!S_ISSOCK(mode)) {
3497                 status = -EINVAL;
3498                 goto out_free;
3499         }
3500
3501         status = nfs4_do_create(dir, dentry, data);
3502 out_free:
3503         nfs4_free_createdata(data);
3504 out:
3505         return status;
3506 }
3507
3508 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3509                 struct iattr *sattr, dev_t rdev)
3510 {
3511         struct nfs4_exception exception = { };
3512         int err;
3513
3514         sattr->ia_mode &= ~current_umask();
3515         do {
3516                 err = nfs4_handle_exception(NFS_SERVER(dir),
3517                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3518                                 &exception);
3519         } while (exception.retry);
3520         return err;
3521 }
3522
3523 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3524                  struct nfs_fsstat *fsstat)
3525 {
3526         struct nfs4_statfs_arg args = {
3527                 .fh = fhandle,
3528                 .bitmask = server->attr_bitmask,
3529         };
3530         struct nfs4_statfs_res res = {
3531                 .fsstat = fsstat,
3532         };
3533         struct rpc_message msg = {
3534                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3535                 .rpc_argp = &args,
3536                 .rpc_resp = &res,
3537         };
3538
3539         nfs_fattr_init(fsstat->fattr);
3540         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3541 }
3542
3543 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3544 {
3545         struct nfs4_exception exception = { };
3546         int err;
3547         do {
3548                 err = nfs4_handle_exception(server,
3549                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3550                                 &exception);
3551         } while (exception.retry);
3552         return err;
3553 }
3554
3555 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3556                 struct nfs_fsinfo *fsinfo)
3557 {
3558         struct nfs4_fsinfo_arg args = {
3559                 .fh = fhandle,
3560                 .bitmask = server->attr_bitmask,
3561         };
3562         struct nfs4_fsinfo_res res = {
3563                 .fsinfo = fsinfo,
3564         };
3565         struct rpc_message msg = {
3566                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3567                 .rpc_argp = &args,
3568                 .rpc_resp = &res,
3569         };
3570
3571         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3572 }
3573
3574 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3575 {
3576         struct nfs4_exception exception = { };
3577         int err;
3578
3579         do {
3580                 err = nfs4_handle_exception(server,
3581                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3582                                 &exception);
3583         } while (exception.retry);
3584         return err;
3585 }
3586
3587 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3588 {
3589         int error;
3590
3591         nfs_fattr_init(fsinfo->fattr);
3592         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3593         if (error == 0) {
3594                 /* block layout checks this! */
3595                 server->pnfs_blksize = fsinfo->blksize;
3596                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3597         }
3598
3599         return error;
3600 }
3601
3602 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3603                 struct nfs_pathconf *pathconf)
3604 {
3605         struct nfs4_pathconf_arg args = {
3606                 .fh = fhandle,
3607                 .bitmask = server->attr_bitmask,
3608         };
3609         struct nfs4_pathconf_res res = {
3610                 .pathconf = pathconf,
3611         };
3612         struct rpc_message msg = {
3613                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3614                 .rpc_argp = &args,
3615                 .rpc_resp = &res,
3616         };
3617
3618         /* None of the pathconf attributes are mandatory to implement */
3619         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3620                 memset(pathconf, 0, sizeof(*pathconf));
3621                 return 0;
3622         }
3623
3624         nfs_fattr_init(pathconf->fattr);
3625         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3626 }
3627
3628 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3629                 struct nfs_pathconf *pathconf)
3630 {
3631         struct nfs4_exception exception = { };
3632         int err;
3633
3634         do {
3635                 err = nfs4_handle_exception(server,
3636                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3637                                 &exception);
3638         } while (exception.retry);
3639         return err;
3640 }
3641
3642 void __nfs4_read_done_cb(struct nfs_read_data *data)
3643 {
3644         nfs_invalidate_atime(data->header->inode);
3645 }
3646
3647 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3648 {
3649         struct nfs_server *server = NFS_SERVER(data->header->inode);
3650
3651         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3652                 rpc_restart_call_prepare(task);
3653                 return -EAGAIN;
3654         }
3655
3656         __nfs4_read_done_cb(data);
3657         if (task->tk_status > 0)
3658                 renew_lease(server, data->timestamp);
3659         return 0;
3660 }
3661
3662 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3663 {
3664
3665         dprintk("--> %s\n", __func__);
3666
3667         if (!nfs4_sequence_done(task, &data->res.seq_res))
3668                 return -EAGAIN;
3669
3670         return data->read_done_cb ? data->read_done_cb(task, data) :
3671                                     nfs4_read_done_cb(task, data);
3672 }
3673
3674 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3675 {
3676         data->timestamp   = jiffies;
3677         data->read_done_cb = nfs4_read_done_cb;
3678         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3679         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3680 }
3681
3682 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3683 {
3684         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3685                                 &data->args.seq_args,
3686                                 &data->res.seq_res,
3687                                 task))
3688                 return;
3689         rpc_call_start(task);
3690 }
3691
3692 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3693 {
3694         struct inode *inode = data->header->inode;
3695
3696         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3697                 rpc_restart_call_prepare(task);
3698                 return -EAGAIN;
3699         }
3700         if (task->tk_status >= 0) {
3701                 renew_lease(NFS_SERVER(inode), data->timestamp);
3702                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3703         }
3704         return 0;
3705 }
3706
3707 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3708 {
3709         if (!nfs4_sequence_done(task, &data->res.seq_res))
3710                 return -EAGAIN;
3711         return data->write_done_cb ? data->write_done_cb(task, data) :
3712                 nfs4_write_done_cb(task, data);
3713 }
3714
3715 static
3716 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3717 {
3718         const struct nfs_pgio_header *hdr = data->header;
3719
3720         /* Don't request attributes for pNFS or O_DIRECT writes */
3721         if (data->ds_clp != NULL || hdr->dreq != NULL)
3722                 return false;
3723         /* Otherwise, request attributes if and only if we don't hold
3724          * a delegation
3725          */
3726         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3727 }
3728
3729 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3730 {
3731         struct nfs_server *server = NFS_SERVER(data->header->inode);
3732
3733         if (!nfs4_write_need_cache_consistency_data(data)) {
3734                 data->args.bitmask = NULL;
3735                 data->res.fattr = NULL;
3736         } else
3737                 data->args.bitmask = server->cache_consistency_bitmask;
3738
3739         if (!data->write_done_cb)
3740                 data->write_done_cb = nfs4_write_done_cb;
3741         data->res.server = server;
3742         data->timestamp   = jiffies;
3743
3744         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3745         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3746 }
3747
3748 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3749 {
3750         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3751                                 &data->args.seq_args,
3752                                 &data->res.seq_res,
3753                                 task))
3754                 return;
3755         rpc_call_start(task);
3756 }
3757
3758 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3759 {
3760         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3761                                 &data->args.seq_args,
3762                                 &data->res.seq_res,
3763                                 task))
3764                 return;
3765         rpc_call_start(task);
3766 }
3767
3768 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3769 {
3770         struct inode *inode = data->inode;
3771
3772         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3773                 rpc_restart_call_prepare(task);
3774                 return -EAGAIN;
3775         }
3776         return 0;
3777 }
3778
3779 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3780 {
3781         if (!nfs4_sequence_done(task, &data->res.seq_res))
3782                 return -EAGAIN;
3783         return data->commit_done_cb(task, data);
3784 }
3785
3786 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3787 {
3788         struct nfs_server *server = NFS_SERVER(data->inode);
3789
3790         if (data->commit_done_cb == NULL)
3791                 data->commit_done_cb = nfs4_commit_done_cb;
3792         data->res.server = server;
3793         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3794         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3795 }
3796
3797 struct nfs4_renewdata {
3798         struct nfs_client       *client;
3799         unsigned long           timestamp;
3800 };
3801
3802 /*
3803  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3804  * standalone procedure for queueing an asynchronous RENEW.
3805  */
3806 static void nfs4_renew_release(void *calldata)
3807 {
3808         struct nfs4_renewdata *data = calldata;
3809         struct nfs_client *clp = data->client;
3810
3811         if (atomic_read(&clp->cl_count) > 1)
3812                 nfs4_schedule_state_renewal(clp);
3813         nfs_put_client(clp);
3814         kfree(data);
3815 }
3816
3817 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3818 {
3819         struct nfs4_renewdata *data = calldata;
3820         struct nfs_client *clp = data->client;
3821         unsigned long timestamp = data->timestamp;
3822
3823         if (task->tk_status < 0) {
3824                 /* Unless we're shutting down, schedule state recovery! */
3825                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3826                         return;
3827                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3828                         nfs4_schedule_lease_recovery(clp);
3829                         return;
3830                 }
3831                 nfs4_schedule_path_down_recovery(clp);
3832         }
3833         do_renew_lease(clp, timestamp);
3834 }
3835
3836 static const struct rpc_call_ops nfs4_renew_ops = {
3837         .rpc_call_done = nfs4_renew_done,
3838         .rpc_release = nfs4_renew_release,
3839 };
3840
3841 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3842 {
3843         struct rpc_message msg = {
3844                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3845                 .rpc_argp       = clp,
3846                 .rpc_cred       = cred,
3847         };
3848         struct nfs4_renewdata *data;
3849
3850         if (renew_flags == 0)
3851                 return 0;
3852         if (!atomic_inc_not_zero(&clp->cl_count))
3853                 return -EIO;
3854         data = kmalloc(sizeof(*data), GFP_NOFS);
3855         if (data == NULL)
3856                 return -ENOMEM;
3857         data->client = clp;
3858         data->timestamp = jiffies;
3859         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3860                         &nfs4_renew_ops, data);
3861 }
3862
3863 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3864 {
3865         struct rpc_message msg = {
3866                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3867                 .rpc_argp       = clp,
3868                 .rpc_cred       = cred,
3869         };
3870         unsigned long now = jiffies;
3871         int status;
3872
3873         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3874         if (status < 0)
3875                 return status;
3876         do_renew_lease(clp, now);
3877         return 0;
3878 }
3879
3880 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3881 {
3882         return (server->caps & NFS_CAP_ACLS)
3883                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3884                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3885 }
3886
3887 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3888  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3889  * the stack.
3890  */
3891 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3892
3893 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3894                 struct page **pages, unsigned int *pgbase)
3895 {
3896         struct page *newpage, **spages;
3897         int rc = 0;
3898         size_t len;
3899         spages = pages;
3900
3901         do {
3902                 len = min_t(size_t, PAGE_SIZE, buflen);
3903                 newpage = alloc_page(GFP_KERNEL);
3904
3905                 if (newpage == NULL)
3906                         goto unwind;
3907                 memcpy(page_address(newpage), buf, len);
3908                 buf += len;
3909                 buflen -= len;
3910                 *pages++ = newpage;
3911                 rc++;
3912         } while (buflen != 0);
3913
3914         return rc;
3915
3916 unwind:
3917         for(; rc > 0; rc--)
3918                 __free_page(spages[rc-1]);
3919         return -ENOMEM;
3920 }
3921
3922 struct nfs4_cached_acl {
3923         int cached;
3924         size_t len;
3925         char data[0];
3926 };
3927
3928 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3929 {
3930         struct nfs_inode *nfsi = NFS_I(inode);
3931
3932         spin_lock(&inode->i_lock);
3933         kfree(nfsi->nfs4_acl);
3934         nfsi->nfs4_acl = acl;
3935         spin_unlock(&inode->i_lock);
3936 }
3937
3938 static void nfs4_zap_acl_attr(struct inode *inode)
3939 {
3940         nfs4_set_cached_acl(inode, NULL);
3941 }
3942
3943 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3944 {
3945         struct nfs_inode *nfsi = NFS_I(inode);
3946         struct nfs4_cached_acl *acl;
3947         int ret = -ENOENT;
3948
3949         spin_lock(&inode->i_lock);
3950         acl = nfsi->nfs4_acl;
3951         if (acl == NULL)
3952                 goto out;
3953         if (buf == NULL) /* user is just asking for length */
3954                 goto out_len;
3955         if (acl->cached == 0)
3956                 goto out;
3957         ret = -ERANGE; /* see getxattr(2) man page */
3958         if (acl->len > buflen)
3959                 goto out;
3960         memcpy(buf, acl->data, acl->len);
3961 out_len:
3962         ret = acl->len;
3963 out:
3964         spin_unlock(&inode->i_lock);
3965         return ret;
3966 }
3967
3968 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3969 {
3970         struct nfs4_cached_acl *acl;
3971         size_t buflen = sizeof(*acl) + acl_len;
3972
3973         if (buflen <= PAGE_SIZE) {
3974                 acl = kmalloc(buflen, GFP_KERNEL);
3975                 if (acl == NULL)
3976                         goto out;
3977                 acl->cached = 1;
3978                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3979         } else {
3980                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3981                 if (acl == NULL)
3982                         goto out;
3983                 acl->cached = 0;
3984         }
3985         acl->len = acl_len;
3986 out:
3987         nfs4_set_cached_acl(inode, acl);
3988 }
3989
3990 /*
3991  * The getxattr API returns the required buffer length when called with a
3992  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3993  * the required buf.  On a NULL buf, we send a page of data to the server
3994  * guessing that the ACL request can be serviced by a page. If so, we cache
3995  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3996  * the cache. If not so, we throw away the page, and cache the required
3997  * length. The next getxattr call will then produce another round trip to
3998  * the server, this time with the input buf of the required size.
3999  */
4000 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4001 {
4002         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4003         struct nfs_getaclargs args = {
4004                 .fh = NFS_FH(inode),
4005                 .acl_pages = pages,
4006                 .acl_len = buflen,
4007         };
4008         struct nfs_getaclres res = {
4009                 .acl_len = buflen,
4010         };
4011         struct rpc_message msg = {
4012                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4013                 .rpc_argp = &args,
4014                 .rpc_resp = &res,
4015         };
4016         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4017         int ret = -ENOMEM, i;
4018
4019         /* As long as we're doing a round trip to the server anyway,
4020          * let's be prepared for a page of acl data. */
4021         if (npages == 0)
4022                 npages = 1;
4023         if (npages > ARRAY_SIZE(pages))
4024                 return -ERANGE;
4025
4026         for (i = 0; i < npages; i++) {
4027                 pages[i] = alloc_page(GFP_KERNEL);
4028                 if (!pages[i])
4029                         goto out_free;
4030         }
4031
4032         /* for decoding across pages */
4033         res.acl_scratch = alloc_page(GFP_KERNEL);
4034         if (!res.acl_scratch)
4035                 goto out_free;
4036
4037         args.acl_len = npages * PAGE_SIZE;
4038         args.acl_pgbase = 0;
4039
4040         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4041                 __func__, buf, buflen, npages, args.acl_len);
4042         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4043                              &msg, &args.seq_args, &res.seq_res, 0);
4044         if (ret)
4045                 goto out_free;
4046
4047         /* Handle the case where the passed-in buffer is too short */
4048         if (res.acl_flags & NFS4_ACL_TRUNC) {
4049                 /* Did the user only issue a request for the acl length? */
4050                 if (buf == NULL)
4051                         goto out_ok;
4052                 ret = -ERANGE;
4053                 goto out_free;
4054         }
4055         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4056         if (buf)
4057                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4058 out_ok:
4059         ret = res.acl_len;
4060 out_free:
4061         for (i = 0; i < npages; i++)
4062                 if (pages[i])
4063                         __free_page(pages[i]);
4064         if (res.acl_scratch)
4065                 __free_page(res.acl_scratch);
4066         return ret;
4067 }
4068
4069 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4070 {
4071         struct nfs4_exception exception = { };
4072         ssize_t ret;
4073         do {
4074                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4075                 if (ret >= 0)
4076                         break;
4077                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4078         } while (exception.retry);
4079         return ret;
4080 }
4081
4082 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4083 {
4084         struct nfs_server *server = NFS_SERVER(inode);
4085         int ret;
4086
4087         if (!nfs4_server_supports_acls(server))
4088                 return -EOPNOTSUPP;
4089         ret = nfs_revalidate_inode(server, inode);
4090         if (ret < 0)
4091                 return ret;
4092         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4093                 nfs_zap_acl_cache(inode);
4094         ret = nfs4_read_cached_acl(inode, buf, buflen);
4095         if (ret != -ENOENT)
4096                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4097                  * but no cached acl data, just the acl length */
4098                 return ret;
4099         return nfs4_get_acl_uncached(inode, buf, buflen);
4100 }
4101
4102 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4103 {
4104         struct nfs_server *server = NFS_SERVER(inode);
4105         struct page *pages[NFS4ACL_MAXPAGES];
4106         struct nfs_setaclargs arg = {
4107                 .fh             = NFS_FH(inode),
4108                 .acl_pages      = pages,
4109                 .acl_len        = buflen,
4110         };
4111         struct nfs_setaclres res;
4112         struct rpc_message msg = {
4113                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4114                 .rpc_argp       = &arg,
4115                 .rpc_resp       = &res,
4116         };
4117         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4118         int ret, i;
4119
4120         if (!nfs4_server_supports_acls(server))
4121                 return -EOPNOTSUPP;
4122         if (npages > ARRAY_SIZE(pages))
4123                 return -ERANGE;
4124         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4125         if (i < 0)
4126                 return i;
4127         nfs4_inode_return_delegation(inode);
4128         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4129
4130         /*
4131          * Free each page after tx, so the only ref left is
4132          * held by the network stack
4133          */
4134         for (; i > 0; i--)
4135                 put_page(pages[i-1]);
4136
4137         /*
4138          * Acl update can result in inode attribute update.
4139          * so mark the attribute cache invalid.
4140          */
4141         spin_lock(&inode->i_lock);
4142         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4143         spin_unlock(&inode->i_lock);
4144         nfs_access_zap_cache(inode);
4145         nfs_zap_acl_cache(inode);
4146         return ret;
4147 }
4148
4149 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4150 {
4151         struct nfs4_exception exception = { };
4152         int err;
4153         do {
4154                 err = nfs4_handle_exception(NFS_SERVER(inode),
4155                                 __nfs4_proc_set_acl(inode, buf, buflen),
4156                                 &exception);
4157         } while (exception.retry);
4158         return err;
4159 }
4160
4161 static int
4162 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4163 {
4164         struct nfs_client *clp = server->nfs_client;
4165
4166         if (task->tk_status >= 0)
4167                 return 0;
4168         switch(task->tk_status) {
4169                 case -NFS4ERR_DELEG_REVOKED:
4170                 case -NFS4ERR_ADMIN_REVOKED:
4171                 case -NFS4ERR_BAD_STATEID:
4172                         if (state == NULL)
4173                                 break;
4174                         nfs_remove_bad_delegation(state->inode);
4175                 case -NFS4ERR_OPENMODE:
4176                         if (state == NULL)
4177                                 break;
4178                         nfs4_schedule_stateid_recovery(server, state);
4179                         goto wait_on_recovery;
4180                 case -NFS4ERR_EXPIRED:
4181                         if (state != NULL)
4182                                 nfs4_schedule_stateid_recovery(server, state);
4183                 case -NFS4ERR_STALE_STATEID:
4184                 case -NFS4ERR_STALE_CLIENTID:
4185                         nfs4_schedule_lease_recovery(clp);
4186                         goto wait_on_recovery;
4187 #if defined(CONFIG_NFS_V4_1)
4188                 case -NFS4ERR_BADSESSION:
4189                 case -NFS4ERR_BADSLOT:
4190                 case -NFS4ERR_BAD_HIGH_SLOT:
4191                 case -NFS4ERR_DEADSESSION:
4192                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4193                 case -NFS4ERR_SEQ_FALSE_RETRY:
4194                 case -NFS4ERR_SEQ_MISORDERED:
4195                         dprintk("%s ERROR %d, Reset session\n", __func__,
4196                                 task->tk_status);
4197                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4198                         task->tk_status = 0;
4199                         return -EAGAIN;
4200 #endif /* CONFIG_NFS_V4_1 */
4201                 case -NFS4ERR_DELAY:
4202                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4203                 case -NFS4ERR_GRACE:
4204                 case -EKEYEXPIRED:
4205                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4206                         task->tk_status = 0;
4207                         return -EAGAIN;
4208                 case -NFS4ERR_RETRY_UNCACHED_REP:
4209                 case -NFS4ERR_OLD_STATEID:
4210                         task->tk_status = 0;
4211                         return -EAGAIN;
4212         }
4213         task->tk_status = nfs4_map_errors(task->tk_status);
4214         return 0;
4215 wait_on_recovery:
4216         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4217         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4218                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4219         task->tk_status = 0;
4220         return -EAGAIN;
4221 }
4222
4223 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4224                                     nfs4_verifier *bootverf)
4225 {
4226         __be32 verf[2];
4227
4228         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4229                 /* An impossible timestamp guarantees this value
4230                  * will never match a generated boot time. */
4231                 verf[0] = 0;
4232                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4233         } else {
4234                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4235                 verf[0] = (__be32)nn->boot_time.tv_sec;
4236                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4237         }
4238         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4239 }
4240
4241 static unsigned int
4242 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4243                                    char *buf, size_t len)
4244 {
4245         unsigned int result;
4246
4247         rcu_read_lock();
4248         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4249                                 clp->cl_ipaddr,
4250                                 rpc_peeraddr2str(clp->cl_rpcclient,
4251                                                         RPC_DISPLAY_ADDR),
4252                                 rpc_peeraddr2str(clp->cl_rpcclient,
4253                                                         RPC_DISPLAY_PROTO));
4254         rcu_read_unlock();
4255         return result;
4256 }
4257
4258 static unsigned int
4259 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4260                                 char *buf, size_t len)
4261 {
4262         char *nodename = clp->cl_rpcclient->cl_nodename;
4263
4264         if (nfs4_client_id_uniquifier[0] != '\0')
4265                 nodename = nfs4_client_id_uniquifier;
4266         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4267                                 clp->rpc_ops->version, clp->cl_minorversion,
4268                                 nodename);
4269 }
4270
4271 /**
4272  * nfs4_proc_setclientid - Negotiate client ID
4273  * @clp: state data structure
4274  * @program: RPC program for NFSv4 callback service
4275  * @port: IP port number for NFS4 callback service
4276  * @cred: RPC credential to use for this call
4277  * @res: where to place the result
4278  *
4279  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4280  */
4281 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4282                 unsigned short port, struct rpc_cred *cred,
4283                 struct nfs4_setclientid_res *res)
4284 {
4285         nfs4_verifier sc_verifier;
4286         struct nfs4_setclientid setclientid = {
4287                 .sc_verifier = &sc_verifier,
4288                 .sc_prog = program,
4289                 .sc_cb_ident = clp->cl_cb_ident,
4290         };
4291         struct rpc_message msg = {
4292                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4293                 .rpc_argp = &setclientid,
4294                 .rpc_resp = res,
4295                 .rpc_cred = cred,
4296         };
4297         int status;
4298
4299         /* nfs_client_id4 */
4300         nfs4_init_boot_verifier(clp, &sc_verifier);
4301         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4302                 setclientid.sc_name_len =
4303                                 nfs4_init_uniform_client_string(clp,
4304                                                 setclientid.sc_name,
4305                                                 sizeof(setclientid.sc_name));
4306         else
4307                 setclientid.sc_name_len =
4308                                 nfs4_init_nonuniform_client_string(clp,
4309                                                 setclientid.sc_name,
4310                                                 sizeof(setclientid.sc_name));
4311         /* cb_client4 */
4312         rcu_read_lock();
4313         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4314                                 sizeof(setclientid.sc_netid),
4315                                 rpc_peeraddr2str(clp->cl_rpcclient,
4316                                                         RPC_DISPLAY_NETID));
4317         rcu_read_unlock();
4318         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4319                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4320                                 clp->cl_ipaddr, port >> 8, port & 255);
4321
4322         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4323                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4324                 setclientid.sc_name_len, setclientid.sc_name);
4325         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4326         dprintk("NFS reply setclientid: %d\n", status);
4327         return status;
4328 }
4329
4330 /**
4331  * nfs4_proc_setclientid_confirm - Confirm client ID
4332  * @clp: state data structure
4333  * @res: result of a previous SETCLIENTID
4334  * @cred: RPC credential to use for this call
4335  *
4336  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4337  */
4338 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4339                 struct nfs4_setclientid_res *arg,
4340                 struct rpc_cred *cred)
4341 {
4342         struct nfs_fsinfo fsinfo;
4343         struct rpc_message msg = {
4344                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4345                 .rpc_argp = arg,
4346                 .rpc_resp = &fsinfo,
4347                 .rpc_cred = cred,
4348         };
4349         unsigned long now;
4350         int status;
4351
4352         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4353                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4354                 clp->cl_clientid);
4355         now = jiffies;
4356         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4357         if (status == 0) {
4358                 spin_lock(&clp->cl_lock);
4359                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4360                 clp->cl_last_renewal = now;
4361                 spin_unlock(&clp->cl_lock);
4362         }
4363         dprintk("NFS reply setclientid_confirm: %d\n", status);
4364         return status;
4365 }
4366
4367 struct nfs4_delegreturndata {
4368         struct nfs4_delegreturnargs args;
4369         struct nfs4_delegreturnres res;
4370         struct nfs_fh fh;
4371         nfs4_stateid stateid;
4372         unsigned long timestamp;
4373         struct nfs_fattr fattr;
4374         int rpc_status;
4375 };
4376
4377 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4378 {
4379         struct nfs4_delegreturndata *data = calldata;
4380
4381         if (!nfs4_sequence_done(task, &data->res.seq_res))
4382                 return;
4383
4384         switch (task->tk_status) {
4385         case -NFS4ERR_STALE_STATEID:
4386         case -NFS4ERR_EXPIRED:
4387         case 0:
4388                 renew_lease(data->res.server, data->timestamp);
4389                 break;
4390         default:
4391                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4392                                 -EAGAIN) {
4393                         rpc_restart_call_prepare(task);
4394                         return;
4395                 }
4396         }
4397         data->rpc_status = task->tk_status;
4398 }
4399
4400 static void nfs4_delegreturn_release(void *calldata)
4401 {
4402         kfree(calldata);
4403 }
4404
4405 #if defined(CONFIG_NFS_V4_1)
4406 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4407 {
4408         struct nfs4_delegreturndata *d_data;
4409
4410         d_data = (struct nfs4_delegreturndata *)data;
4411
4412         if (nfs4_setup_sequence(d_data->res.server,
4413                                 &d_data->args.seq_args,
4414                                 &d_data->res.seq_res, task))
4415                 return;
4416         rpc_call_start(task);
4417 }
4418 #endif /* CONFIG_NFS_V4_1 */
4419
4420 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4421 #if defined(CONFIG_NFS_V4_1)
4422         .rpc_call_prepare = nfs4_delegreturn_prepare,
4423 #endif /* CONFIG_NFS_V4_1 */
4424         .rpc_call_done = nfs4_delegreturn_done,
4425         .rpc_release = nfs4_delegreturn_release,
4426 };
4427
4428 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4429 {
4430         struct nfs4_delegreturndata *data;
4431         struct nfs_server *server = NFS_SERVER(inode);
4432         struct rpc_task *task;
4433         struct rpc_message msg = {
4434                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4435                 .rpc_cred = cred,
4436         };
4437         struct rpc_task_setup task_setup_data = {
4438                 .rpc_client = server->client,
4439                 .rpc_message = &msg,
4440                 .callback_ops = &nfs4_delegreturn_ops,
4441                 .flags = RPC_TASK_ASYNC,
4442         };
4443         int status = 0;
4444
4445         data = kzalloc(sizeof(*data), GFP_NOFS);
4446         if (data == NULL)
4447                 return -ENOMEM;
4448         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4449         data->args.fhandle = &data->fh;
4450         data->args.stateid = &data->stateid;
4451         data->args.bitmask = server->cache_consistency_bitmask;
4452         nfs_copy_fh(&data->fh, NFS_FH(inode));
4453         nfs4_stateid_copy(&data->stateid, stateid);
4454         data->res.fattr = &data->fattr;
4455         data->res.server = server;
4456         nfs_fattr_init(data->res.fattr);
4457         data->timestamp = jiffies;
4458         data->rpc_status = 0;
4459
4460         task_setup_data.callback_data = data;
4461         msg.rpc_argp = &data->args;
4462         msg.rpc_resp = &data->res;
4463         task = rpc_run_task(&task_setup_data);
4464         if (IS_ERR(task))
4465                 return PTR_ERR(task);
4466         if (!issync)
4467                 goto out;
4468         status = nfs4_wait_for_completion_rpc_task(task);
4469         if (status != 0)
4470                 goto out;
4471         status = data->rpc_status;
4472         if (status == 0)
4473                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4474         else
4475                 nfs_refresh_inode(inode, &data->fattr);
4476 out:
4477         rpc_put_task(task);
4478         return status;
4479 }
4480
4481 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4482 {
4483         struct nfs_server *server = NFS_SERVER(inode);
4484         struct nfs4_exception exception = { };
4485         int err;
4486         do {
4487                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4488                 switch (err) {
4489                         case -NFS4ERR_STALE_STATEID:
4490                         case -NFS4ERR_EXPIRED:
4491                         case 0:
4492                                 return 0;
4493                 }
4494                 err = nfs4_handle_exception(server, err, &exception);
4495         } while (exception.retry);
4496         return err;
4497 }
4498
4499 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4500 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4501
4502 /*
4503  * sleep, with exponential backoff, and retry the LOCK operation.
4504  */
4505 static unsigned long
4506 nfs4_set_lock_task_retry(unsigned long timeout)
4507 {
4508         freezable_schedule_timeout_killable(timeout);
4509         timeout <<= 1;
4510         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4511                 return NFS4_LOCK_MAXTIMEOUT;
4512         return timeout;
4513 }
4514
4515 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4516 {
4517         struct inode *inode = state->inode;
4518         struct nfs_server *server = NFS_SERVER(inode);
4519         struct nfs_client *clp = server->nfs_client;
4520         struct nfs_lockt_args arg = {
4521                 .fh = NFS_FH(inode),
4522                 .fl = request,
4523         };
4524         struct nfs_lockt_res res = {
4525                 .denied = request,
4526         };
4527         struct rpc_message msg = {
4528                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4529                 .rpc_argp       = &arg,
4530                 .rpc_resp       = &res,
4531                 .rpc_cred       = state->owner->so_cred,
4532         };
4533         struct nfs4_lock_state *lsp;
4534         int status;
4535
4536         arg.lock_owner.clientid = clp->cl_clientid;
4537         status = nfs4_set_lock_state(state, request);
4538         if (status != 0)
4539                 goto out;
4540         lsp = request->fl_u.nfs4_fl.owner;
4541         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4542         arg.lock_owner.s_dev = server->s_dev;
4543         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4544         switch (status) {
4545                 case 0:
4546                         request->fl_type = F_UNLCK;
4547                         break;
4548                 case -NFS4ERR_DENIED:
4549                         status = 0;
4550         }
4551         request->fl_ops->fl_release_private(request);
4552 out:
4553         return status;
4554 }
4555
4556 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4557 {
4558         struct nfs4_exception exception = { };
4559         int err;
4560
4561         do {
4562                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4563                                 _nfs4_proc_getlk(state, cmd, request),
4564                                 &exception);
4565         } while (exception.retry);
4566         return err;
4567 }
4568
4569 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4570 {
4571         int res = 0;
4572         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4573                 case FL_POSIX:
4574                         res = posix_lock_file_wait(file, fl);
4575                         break;
4576                 case FL_FLOCK:
4577                         res = flock_lock_file_wait(file, fl);
4578                         break;
4579                 default:
4580                         BUG();
4581         }
4582         return res;
4583 }
4584
4585 struct nfs4_unlockdata {
4586         struct nfs_locku_args arg;
4587         struct nfs_locku_res res;
4588         struct nfs4_lock_state *lsp;
4589         struct nfs_open_context *ctx;
4590         struct file_lock fl;
4591         const struct nfs_server *server;
4592         unsigned long timestamp;
4593 };
4594
4595 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4596                 struct nfs_open_context *ctx,
4597                 struct nfs4_lock_state *lsp,
4598                 struct nfs_seqid *seqid)
4599 {
4600         struct nfs4_unlockdata *p;
4601         struct inode *inode = lsp->ls_state->inode;
4602
4603         p = kzalloc(sizeof(*p), GFP_NOFS);
4604         if (p == NULL)
4605                 return NULL;
4606         p->arg.fh = NFS_FH(inode);
4607         p->arg.fl = &p->fl;
4608         p->arg.seqid = seqid;
4609         p->res.seqid = seqid;
4610         p->arg.stateid = &lsp->ls_stateid;
4611         p->lsp = lsp;
4612         atomic_inc(&lsp->ls_count);
4613         /* Ensure we don't close file until we're done freeing locks! */
4614         p->ctx = get_nfs_open_context(ctx);
4615         memcpy(&p->fl, fl, sizeof(p->fl));
4616         p->server = NFS_SERVER(inode);
4617         return p;
4618 }
4619
4620 static void nfs4_locku_release_calldata(void *data)
4621 {
4622         struct nfs4_unlockdata *calldata = data;
4623         nfs_free_seqid(calldata->arg.seqid);
4624         nfs4_put_lock_state(calldata->lsp);
4625         put_nfs_open_context(calldata->ctx);
4626         kfree(calldata);
4627 }
4628
4629 static void nfs4_locku_done(struct rpc_task *task, void *data)
4630 {
4631         struct nfs4_unlockdata *calldata = data;
4632
4633         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4634                 return;
4635         switch (task->tk_status) {
4636                 case 0:
4637                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4638                                         &calldata->res.stateid);
4639                         renew_lease(calldata->server, calldata->timestamp);
4640                         break;
4641                 case -NFS4ERR_BAD_STATEID:
4642                 case -NFS4ERR_OLD_STATEID:
4643                 case -NFS4ERR_STALE_STATEID:
4644                 case -NFS4ERR_EXPIRED:
4645                         break;
4646                 default:
4647                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4648                                 rpc_restart_call_prepare(task);
4649         }
4650         nfs_release_seqid(calldata->arg.seqid);
4651 }
4652
4653 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4654 {
4655         struct nfs4_unlockdata *calldata = data;
4656
4657         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4658                 return;
4659         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4660                 /* Note: exit _without_ running nfs4_locku_done */
4661                 task->tk_action = NULL;
4662                 return;
4663         }
4664         calldata->timestamp = jiffies;
4665         if (nfs4_setup_sequence(calldata->server,
4666                                 &calldata->arg.seq_args,
4667                                 &calldata->res.seq_res,
4668                                 task) != 0)
4669                 nfs_release_seqid(calldata->arg.seqid);
4670         else
4671                 rpc_call_start(task);
4672 }
4673
4674 static const struct rpc_call_ops nfs4_locku_ops = {
4675         .rpc_call_prepare = nfs4_locku_prepare,
4676         .rpc_call_done = nfs4_locku_done,
4677         .rpc_release = nfs4_locku_release_calldata,
4678 };
4679
4680 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4681                 struct nfs_open_context *ctx,
4682                 struct nfs4_lock_state *lsp,
4683                 struct nfs_seqid *seqid)
4684 {
4685         struct nfs4_unlockdata *data;
4686         struct rpc_message msg = {
4687                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4688                 .rpc_cred = ctx->cred,
4689         };
4690         struct rpc_task_setup task_setup_data = {
4691                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4692                 .rpc_message = &msg,
4693                 .callback_ops = &nfs4_locku_ops,
4694                 .workqueue = nfsiod_workqueue,
4695                 .flags = RPC_TASK_ASYNC,
4696         };
4697
4698         /* Ensure this is an unlock - when canceling a lock, the
4699          * canceled lock is passed in, and it won't be an unlock.
4700          */
4701         fl->fl_type = F_UNLCK;
4702
4703         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4704         if (data == NULL) {
4705                 nfs_free_seqid(seqid);
4706                 return ERR_PTR(-ENOMEM);
4707         }
4708
4709         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4710         msg.rpc_argp = &data->arg;
4711         msg.rpc_resp = &data->res;
4712         task_setup_data.callback_data = data;
4713         return rpc_run_task(&task_setup_data);
4714 }
4715
4716 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4717 {
4718         struct nfs_inode *nfsi = NFS_I(state->inode);
4719         struct nfs_seqid *seqid;
4720         struct nfs4_lock_state *lsp;
4721         struct rpc_task *task;
4722         int status = 0;
4723         unsigned char fl_flags = request->fl_flags;
4724
4725         status = nfs4_set_lock_state(state, request);
4726         /* Unlock _before_ we do the RPC call */
4727         request->fl_flags |= FL_EXISTS;
4728         down_read(&nfsi->rwsem);
4729         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4730                 up_read(&nfsi->rwsem);
4731                 goto out;
4732         }
4733         up_read(&nfsi->rwsem);
4734         if (status != 0)
4735                 goto out;
4736         /* Is this a delegated lock? */
4737         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4738                 goto out;
4739         lsp = request->fl_u.nfs4_fl.owner;
4740         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4741         status = -ENOMEM;
4742         if (seqid == NULL)
4743                 goto out;
4744         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4745         status = PTR_ERR(task);
4746         if (IS_ERR(task))
4747                 goto out;
4748         status = nfs4_wait_for_completion_rpc_task(task);
4749         rpc_put_task(task);
4750 out:
4751         request->fl_flags = fl_flags;
4752         return status;
4753 }
4754
4755 struct nfs4_lockdata {
4756         struct nfs_lock_args arg;
4757         struct nfs_lock_res res;
4758         struct nfs4_lock_state *lsp;
4759         struct nfs_open_context *ctx;
4760         struct file_lock fl;
4761         unsigned long timestamp;
4762         int rpc_status;
4763         int cancelled;
4764         struct nfs_server *server;
4765 };
4766
4767 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4768                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4769                 gfp_t gfp_mask)
4770 {
4771         struct nfs4_lockdata *p;
4772         struct inode *inode = lsp->ls_state->inode;
4773         struct nfs_server *server = NFS_SERVER(inode);
4774
4775         p = kzalloc(sizeof(*p), gfp_mask);
4776         if (p == NULL)
4777                 return NULL;
4778
4779         p->arg.fh = NFS_FH(inode);
4780         p->arg.fl = &p->fl;
4781         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4782         if (p->arg.open_seqid == NULL)
4783                 goto out_free;
4784         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4785         if (p->arg.lock_seqid == NULL)
4786                 goto out_free_seqid;
4787         p->arg.lock_stateid = &lsp->ls_stateid;
4788         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4789         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4790         p->arg.lock_owner.s_dev = server->s_dev;
4791         p->res.lock_seqid = p->arg.lock_seqid;
4792         p->lsp = lsp;
4793         p->server = server;
4794         atomic_inc(&lsp->ls_count);
4795         p->ctx = get_nfs_open_context(ctx);
4796         memcpy(&p->fl, fl, sizeof(p->fl));
4797         return p;
4798 out_free_seqid:
4799         nfs_free_seqid(p->arg.open_seqid);
4800 out_free:
4801         kfree(p);
4802         return NULL;
4803 }
4804
4805 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4806 {
4807         struct nfs4_lockdata *data = calldata;
4808         struct nfs4_state *state = data->lsp->ls_state;
4809
4810         dprintk("%s: begin!\n", __func__);
4811         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4812                 return;
4813         /* Do we need to do an open_to_lock_owner? */
4814         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4815                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4816                         goto out_release_lock_seqid;
4817                 data->arg.open_stateid = &state->stateid;
4818                 data->arg.new_lock_owner = 1;
4819                 data->res.open_seqid = data->arg.open_seqid;
4820         } else
4821                 data->arg.new_lock_owner = 0;
4822         data->timestamp = jiffies;
4823         if (nfs4_setup_sequence(data->server,
4824                                 &data->arg.seq_args,
4825                                 &data->res.seq_res,
4826                                 task) == 0) {
4827                 rpc_call_start(task);
4828                 return;
4829         }
4830         nfs_release_seqid(data->arg.open_seqid);
4831 out_release_lock_seqid:
4832         nfs_release_seqid(data->arg.lock_seqid);
4833         dprintk("%s: done!, ret = %d\n", __func__, task->tk_status);
4834 }
4835
4836 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4837 {
4838         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4839         nfs4_lock_prepare(task, calldata);
4840 }
4841
4842 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4843 {
4844         struct nfs4_lockdata *data = calldata;
4845
4846         dprintk("%s: begin!\n", __func__);
4847
4848         if (!nfs4_sequence_done(task, &data->res.seq_res))
4849                 return;
4850
4851         data->rpc_status = task->tk_status;
4852         if (data->arg.new_lock_owner != 0) {
4853                 if (data->rpc_status == 0)
4854                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4855                 else
4856                         goto out;
4857         }
4858         if (data->rpc_status == 0) {
4859                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4860                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4861                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4862         }
4863 out:
4864         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4865 }
4866
4867 static void nfs4_lock_release(void *calldata)
4868 {
4869         struct nfs4_lockdata *data = calldata;
4870
4871         dprintk("%s: begin!\n", __func__);
4872         nfs_free_seqid(data->arg.open_seqid);
4873         if (data->cancelled != 0) {
4874                 struct rpc_task *task;
4875                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4876                                 data->arg.lock_seqid);
4877                 if (!IS_ERR(task))
4878                         rpc_put_task_async(task);
4879                 dprintk("%s: cancelling lock!\n", __func__);
4880         } else
4881                 nfs_free_seqid(data->arg.lock_seqid);
4882         nfs4_put_lock_state(data->lsp);
4883         put_nfs_open_context(data->ctx);
4884         kfree(data);
4885         dprintk("%s: done!\n", __func__);
4886 }
4887
4888 static const struct rpc_call_ops nfs4_lock_ops = {
4889         .rpc_call_prepare = nfs4_lock_prepare,
4890         .rpc_call_done = nfs4_lock_done,
4891         .rpc_release = nfs4_lock_release,
4892 };
4893
4894 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4895         .rpc_call_prepare = nfs4_recover_lock_prepare,
4896         .rpc_call_done = nfs4_lock_done,
4897         .rpc_release = nfs4_lock_release,
4898 };
4899
4900 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4901 {
4902         switch (error) {
4903         case -NFS4ERR_ADMIN_REVOKED:
4904         case -NFS4ERR_BAD_STATEID:
4905                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4906                 if (new_lock_owner != 0 ||
4907                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4908                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4909                 break;
4910         case -NFS4ERR_STALE_STATEID:
4911                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4912         case -NFS4ERR_EXPIRED:
4913                 nfs4_schedule_lease_recovery(server->nfs_client);
4914         };
4915 }
4916
4917 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4918 {
4919         struct nfs4_lockdata *data;
4920         struct rpc_task *task;
4921         struct rpc_message msg = {
4922                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4923                 .rpc_cred = state->owner->so_cred,
4924         };
4925         struct rpc_task_setup task_setup_data = {
4926                 .rpc_client = NFS_CLIENT(state->inode),
4927                 .rpc_message = &msg,
4928                 .callback_ops = &nfs4_lock_ops,
4929                 .workqueue = nfsiod_workqueue,
4930                 .flags = RPC_TASK_ASYNC,
4931         };
4932         int ret;
4933
4934         dprintk("%s: begin!\n", __func__);
4935         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4936                         fl->fl_u.nfs4_fl.owner,
4937                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4938         if (data == NULL)
4939                 return -ENOMEM;
4940         if (IS_SETLKW(cmd))
4941                 data->arg.block = 1;
4942         if (recovery_type > NFS_LOCK_NEW) {
4943                 if (recovery_type == NFS_LOCK_RECLAIM)
4944                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4945                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4946         }
4947         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4948         msg.rpc_argp = &data->arg;
4949         msg.rpc_resp = &data->res;
4950         task_setup_data.callback_data = data;
4951         task = rpc_run_task(&task_setup_data);
4952         if (IS_ERR(task))
4953                 return PTR_ERR(task);
4954         ret = nfs4_wait_for_completion_rpc_task(task);
4955         if (ret == 0) {
4956                 ret = data->rpc_status;
4957                 if (ret)
4958                         nfs4_handle_setlk_error(data->server, data->lsp,
4959                                         data->arg.new_lock_owner, ret);
4960         } else
4961                 data->cancelled = 1;
4962         rpc_put_task(task);
4963         dprintk("%s: done, ret = %d!\n", __func__, ret);
4964         return ret;
4965 }
4966
4967 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4968 {
4969         struct nfs_server *server = NFS_SERVER(state->inode);
4970         struct nfs4_exception exception = {
4971                 .inode = state->inode,
4972         };
4973         int err;
4974
4975         do {
4976                 /* Cache the lock if possible... */
4977                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4978                         return 0;
4979                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4980                 if (err != -NFS4ERR_DELAY)
4981                         break;
4982                 nfs4_handle_exception(server, err, &exception);
4983         } while (exception.retry);
4984         return err;
4985 }
4986
4987 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4988 {
4989         struct nfs_server *server = NFS_SERVER(state->inode);
4990         struct nfs4_exception exception = {
4991                 .inode = state->inode,
4992         };
4993         int err;
4994
4995         err = nfs4_set_lock_state(state, request);
4996         if (err != 0)
4997                 return err;
4998         do {
4999                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5000                         return 0;
5001                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5002                 switch (err) {
5003                 default:
5004                         goto out;
5005                 case -NFS4ERR_GRACE:
5006                 case -NFS4ERR_DELAY:
5007                         nfs4_handle_exception(server, err, &exception);
5008                         err = 0;
5009                 }
5010         } while (exception.retry);
5011 out:
5012         return err;
5013 }
5014
5015 #if defined(CONFIG_NFS_V4_1)
5016 /**
5017  * nfs41_check_expired_locks - possibly free a lock stateid
5018  *
5019  * @state: NFSv4 state for an inode
5020  *
5021  * Returns NFS_OK if recovery for this stateid is now finished.
5022  * Otherwise a negative NFS4ERR value is returned.
5023  */
5024 static int nfs41_check_expired_locks(struct nfs4_state *state)
5025 {
5026         int status, ret = -NFS4ERR_BAD_STATEID;
5027         struct nfs4_lock_state *lsp;
5028         struct nfs_server *server = NFS_SERVER(state->inode);
5029
5030         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5031                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5032                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
5033                         if (status != NFS_OK) {
5034                                 /* Free the stateid unless the server
5035                                  * informs us the stateid is unrecognized. */
5036                                 if (status != -NFS4ERR_BAD_STATEID)
5037                                         nfs41_free_stateid(server,
5038                                                         &lsp->ls_stateid);
5039                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5040                                 ret = status;
5041                         }
5042                 }
5043         };
5044
5045         return ret;
5046 }
5047
5048 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5049 {
5050         int status = NFS_OK;
5051
5052         if (test_bit(LK_STATE_IN_USE, &state->flags))
5053                 status = nfs41_check_expired_locks(state);
5054         if (status != NFS_OK)
5055                 status = nfs4_lock_expired(state, request);
5056         return status;
5057 }
5058 #endif
5059
5060 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5061 {
5062         struct nfs_inode *nfsi = NFS_I(state->inode);
5063         unsigned char fl_flags = request->fl_flags;
5064         int status = -ENOLCK;
5065
5066         if ((fl_flags & FL_POSIX) &&
5067                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5068                 goto out;
5069         /* Is this a delegated open? */
5070         status = nfs4_set_lock_state(state, request);
5071         if (status != 0)
5072                 goto out;
5073         request->fl_flags |= FL_ACCESS;
5074         status = do_vfs_lock(request->fl_file, request);
5075         if (status < 0)
5076                 goto out;
5077         down_read(&nfsi->rwsem);
5078         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5079                 /* Yes: cache locks! */
5080                 /* ...but avoid races with delegation recall... */
5081                 request->fl_flags = fl_flags & ~FL_SLEEP;
5082                 status = do_vfs_lock(request->fl_file, request);
5083                 goto out_unlock;
5084         }
5085         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5086         if (status != 0)
5087                 goto out_unlock;
5088         /* Note: we always want to sleep here! */
5089         request->fl_flags = fl_flags | FL_SLEEP;
5090         if (do_vfs_lock(request->fl_file, request) < 0)
5091                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5092                         "manager!\n", __func__);
5093 out_unlock:
5094         up_read(&nfsi->rwsem);
5095 out:
5096         request->fl_flags = fl_flags;
5097         return status;
5098 }
5099
5100 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5101 {
5102         struct nfs4_exception exception = {
5103                 .state = state,
5104                 .inode = state->inode,
5105         };
5106         int err;
5107
5108         do {
5109                 err = _nfs4_proc_setlk(state, cmd, request);
5110                 if (err == -NFS4ERR_DENIED)
5111                         err = -EAGAIN;
5112                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5113                                 err, &exception);
5114         } while (exception.retry);
5115         return err;
5116 }
5117
5118 static int
5119 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5120 {
5121         struct nfs_open_context *ctx;
5122         struct nfs4_state *state;
5123         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5124         int status;
5125
5126         /* verify open state */
5127         ctx = nfs_file_open_context(filp);
5128         state = ctx->state;
5129
5130         if (request->fl_start < 0 || request->fl_end < 0)
5131                 return -EINVAL;
5132
5133         if (IS_GETLK(cmd)) {
5134                 if (state != NULL)
5135                         return nfs4_proc_getlk(state, F_GETLK, request);
5136                 return 0;
5137         }
5138
5139         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5140                 return -EINVAL;
5141
5142         if (request->fl_type == F_UNLCK) {
5143                 if (state != NULL)
5144                         return nfs4_proc_unlck(state, cmd, request);
5145                 return 0;
5146         }
5147
5148         if (state == NULL)
5149                 return -ENOLCK;
5150         /*
5151          * Don't rely on the VFS having checked the file open mode,
5152          * since it won't do this for flock() locks.
5153          */
5154         switch (request->fl_type) {
5155         case F_RDLCK:
5156                 if (!(filp->f_mode & FMODE_READ))
5157                         return -EBADF;
5158                 break;
5159         case F_WRLCK:
5160                 if (!(filp->f_mode & FMODE_WRITE))
5161                         return -EBADF;
5162         }
5163
5164         do {
5165                 status = nfs4_proc_setlk(state, cmd, request);
5166                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5167                         break;
5168                 timeout = nfs4_set_lock_task_retry(timeout);
5169                 status = -ERESTARTSYS;
5170                 if (signalled())
5171                         break;
5172         } while(status < 0);
5173         return status;
5174 }
5175
5176 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
5177 {
5178         struct nfs_server *server = NFS_SERVER(state->inode);
5179         struct nfs4_exception exception = { };
5180         int err;
5181
5182         err = nfs4_set_lock_state(state, fl);
5183         if (err != 0)
5184                 goto out;
5185         do {
5186                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5187                 switch (err) {
5188                         default:
5189                                 printk(KERN_ERR "NFS: %s: unhandled error "
5190                                         "%d.\n", __func__, err);
5191                         case 0:
5192                         case -ESTALE:
5193                                 goto out;
5194                         case -NFS4ERR_EXPIRED:
5195                                 nfs4_schedule_stateid_recovery(server, state);
5196                         case -NFS4ERR_STALE_CLIENTID:
5197                         case -NFS4ERR_STALE_STATEID:
5198                                 nfs4_schedule_lease_recovery(server->nfs_client);
5199                                 goto out;
5200                         case -NFS4ERR_BADSESSION:
5201                         case -NFS4ERR_BADSLOT:
5202                         case -NFS4ERR_BAD_HIGH_SLOT:
5203                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
5204                         case -NFS4ERR_DEADSESSION:
5205                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
5206                                 goto out;
5207                         case -ERESTARTSYS:
5208                                 /*
5209                                  * The show must go on: exit, but mark the
5210                                  * stateid as needing recovery.
5211                                  */
5212                         case -NFS4ERR_DELEG_REVOKED:
5213                         case -NFS4ERR_ADMIN_REVOKED:
5214                         case -NFS4ERR_BAD_STATEID:
5215                         case -NFS4ERR_OPENMODE:
5216                                 nfs4_schedule_stateid_recovery(server, state);
5217                                 err = 0;
5218                                 goto out;
5219                         case -EKEYEXPIRED:
5220                                 /*
5221                                  * User RPCSEC_GSS context has expired.
5222                                  * We cannot recover this stateid now, so
5223                                  * skip it and allow recovery thread to
5224                                  * proceed.
5225                                  */
5226                                 err = 0;
5227                                 goto out;
5228                         case -ENOMEM:
5229                         case -NFS4ERR_DENIED:
5230                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
5231                                 err = 0;
5232                                 goto out;
5233                         case -NFS4ERR_DELAY:
5234                                 break;
5235                 }
5236                 err = nfs4_handle_exception(server, err, &exception);
5237         } while (exception.retry);
5238 out:
5239         return err;
5240 }
5241
5242 struct nfs_release_lockowner_data {
5243         struct nfs4_lock_state *lsp;
5244         struct nfs_server *server;
5245         struct nfs_release_lockowner_args args;
5246 };
5247
5248 static void nfs4_release_lockowner_release(void *calldata)
5249 {
5250         struct nfs_release_lockowner_data *data = calldata;
5251         nfs4_free_lock_state(data->server, data->lsp);
5252         kfree(calldata);
5253 }
5254
5255 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5256         .rpc_release = nfs4_release_lockowner_release,
5257 };
5258
5259 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5260 {
5261         struct nfs_server *server = lsp->ls_state->owner->so_server;
5262         struct nfs_release_lockowner_data *data;
5263         struct rpc_message msg = {
5264                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5265         };
5266
5267         if (server->nfs_client->cl_mvops->minor_version != 0)
5268                 return -EINVAL;
5269         data = kmalloc(sizeof(*data), GFP_NOFS);
5270         if (!data)
5271                 return -ENOMEM;
5272         data->lsp = lsp;
5273         data->server = server;
5274         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5275         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5276         data->args.lock_owner.s_dev = server->s_dev;
5277         msg.rpc_argp = &data->args;
5278         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5279         return 0;
5280 }
5281
5282 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5283
5284 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5285                                    const void *buf, size_t buflen,
5286                                    int flags, int type)
5287 {
5288         if (strcmp(key, "") != 0)
5289                 return -EINVAL;
5290
5291         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5292 }
5293
5294 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5295                                    void *buf, size_t buflen, int type)
5296 {
5297         if (strcmp(key, "") != 0)
5298                 return -EINVAL;
5299
5300         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5301 }
5302
5303 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5304                                        size_t list_len, const char *name,
5305                                        size_t name_len, int type)
5306 {
5307         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5308
5309         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5310                 return 0;
5311
5312         if (list && len <= list_len)
5313                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5314         return len;
5315 }
5316
5317 /*
5318  * nfs_fhget will use either the mounted_on_fileid or the fileid
5319  */
5320 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5321 {
5322         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5323                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5324               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5325               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5326                 return;
5327
5328         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5329                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5330         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5331         fattr->nlink = 2;
5332 }
5333
5334 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5335                                    const struct qstr *name,
5336                                    struct nfs4_fs_locations *fs_locations,
5337                                    struct page *page)
5338 {
5339         struct nfs_server *server = NFS_SERVER(dir);
5340         u32 bitmask[2] = {
5341                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5342         };
5343         struct nfs4_fs_locations_arg args = {
5344                 .dir_fh = NFS_FH(dir),
5345                 .name = name,
5346                 .page = page,
5347                 .bitmask = bitmask,
5348         };
5349         struct nfs4_fs_locations_res res = {
5350                 .fs_locations = fs_locations,
5351         };
5352         struct rpc_message msg = {
5353                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5354                 .rpc_argp = &args,
5355                 .rpc_resp = &res,
5356         };
5357         int status;
5358
5359         dprintk("%s: start\n", __func__);
5360
5361         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5362          * is not supported */
5363         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5364                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5365         else
5366                 bitmask[0] |= FATTR4_WORD0_FILEID;
5367
5368         nfs_fattr_init(&fs_locations->fattr);
5369         fs_locations->server = server;
5370         fs_locations->nlocations = 0;
5371         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5372         dprintk("%s: returned status = %d\n", __func__, status);
5373         return status;
5374 }
5375
5376 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5377                            const struct qstr *name,
5378                            struct nfs4_fs_locations *fs_locations,
5379                            struct page *page)
5380 {
5381         struct nfs4_exception exception = { };
5382         int err;
5383         do {
5384                 err = nfs4_handle_exception(NFS_SERVER(dir),
5385                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5386                                 &exception);
5387         } while (exception.retry);
5388         return err;
5389 }
5390
5391 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5392 {
5393         int status;
5394         struct nfs4_secinfo_arg args = {
5395                 .dir_fh = NFS_FH(dir),
5396                 .name   = name,
5397         };
5398         struct nfs4_secinfo_res res = {
5399                 .flavors     = flavors,
5400         };
5401         struct rpc_message msg = {
5402                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5403                 .rpc_argp = &args,
5404                 .rpc_resp = &res,
5405         };
5406
5407         dprintk("NFS call  secinfo %s\n", name->name);
5408         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5409         dprintk("NFS reply  secinfo: %d\n", status);
5410         return status;
5411 }
5412
5413 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5414                       struct nfs4_secinfo_flavors *flavors)
5415 {
5416         struct nfs4_exception exception = { };
5417         int err;
5418         do {
5419                 err = nfs4_handle_exception(NFS_SERVER(dir),
5420                                 _nfs4_proc_secinfo(dir, name, flavors),
5421                                 &exception);
5422         } while (exception.retry);
5423         return err;
5424 }
5425
5426 #ifdef CONFIG_NFS_V4_1
5427 /*
5428  * Check the exchange flags returned by the server for invalid flags, having
5429  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5430  * DS flags set.
5431  */
5432 static int nfs4_check_cl_exchange_flags(u32 flags)
5433 {
5434         if (flags & ~EXCHGID4_FLAG_MASK_R)
5435                 goto out_inval;
5436         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5437             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5438                 goto out_inval;
5439         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5440                 goto out_inval;
5441         return NFS_OK;
5442 out_inval:
5443         return -NFS4ERR_INVAL;
5444 }
5445
5446 static bool
5447 nfs41_same_server_scope(struct nfs41_server_scope *a,
5448                         struct nfs41_server_scope *b)
5449 {
5450         if (a->server_scope_sz == b->server_scope_sz &&
5451             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5452                 return true;
5453
5454         return false;
5455 }
5456
5457 /*
5458  * nfs4_proc_bind_conn_to_session()
5459  *
5460  * The 4.1 client currently uses the same TCP connection for the
5461  * fore and backchannel.
5462  */
5463 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5464 {
5465         int status;
5466         struct nfs41_bind_conn_to_session_res res;
5467         struct rpc_message msg = {
5468                 .rpc_proc =
5469                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5470                 .rpc_argp = clp,
5471                 .rpc_resp = &res,
5472                 .rpc_cred = cred,
5473         };
5474
5475         dprintk("--> %s\n", __func__);
5476
5477         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5478         if (unlikely(res.session == NULL)) {
5479                 status = -ENOMEM;
5480                 goto out;
5481         }
5482
5483         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5484         if (status == 0) {
5485                 if (memcmp(res.session->sess_id.data,
5486                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5487                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5488                         status = -EIO;
5489                         goto out_session;
5490                 }
5491                 if (res.dir != NFS4_CDFS4_BOTH) {
5492                         dprintk("NFS: %s: Unexpected direction from server\n",
5493                                 __func__);
5494                         status = -EIO;
5495                         goto out_session;
5496                 }
5497                 if (res.use_conn_in_rdma_mode) {
5498                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5499                                 __func__);
5500                         status = -EIO;
5501                         goto out_session;
5502                 }
5503         }
5504 out_session:
5505         kfree(res.session);
5506 out:
5507         dprintk("<-- %s status= %d\n", __func__, status);
5508         return status;
5509 }
5510
5511 /*
5512  * nfs4_proc_exchange_id()
5513  *
5514  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5515  *
5516  * Since the clientid has expired, all compounds using sessions
5517  * associated with the stale clientid will be returning
5518  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5519  * be in some phase of session reset.
5520  */
5521 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5522 {
5523         nfs4_verifier verifier;
5524         struct nfs41_exchange_id_args args = {
5525                 .verifier = &verifier,
5526                 .client = clp,
5527                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5528         };
5529         struct nfs41_exchange_id_res res = {
5530                 0
5531         };
5532         int status;
5533         struct rpc_message msg = {
5534                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5535                 .rpc_argp = &args,
5536                 .rpc_resp = &res,
5537                 .rpc_cred = cred,
5538         };
5539
5540         nfs4_init_boot_verifier(clp, &verifier);
5541         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5542                                                         sizeof(args.id));
5543         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5544                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5545                 args.id_len, args.id);
5546
5547         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5548                                         GFP_NOFS);
5549         if (unlikely(res.server_owner == NULL)) {
5550                 status = -ENOMEM;
5551                 goto out;
5552         }
5553
5554         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5555                                         GFP_NOFS);
5556         if (unlikely(res.server_scope == NULL)) {
5557                 status = -ENOMEM;
5558                 goto out_server_owner;
5559         }
5560
5561         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5562         if (unlikely(res.impl_id == NULL)) {
5563                 status = -ENOMEM;
5564                 goto out_server_scope;
5565         }
5566
5567         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5568         if (status == 0)
5569                 status = nfs4_check_cl_exchange_flags(res.flags);
5570
5571         if (status == 0) {
5572                 clp->cl_clientid = res.clientid;
5573                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5574                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5575                         clp->cl_seqid = res.seqid;
5576
5577                 kfree(clp->cl_serverowner);
5578                 clp->cl_serverowner = res.server_owner;
5579                 res.server_owner = NULL;
5580
5581                 /* use the most recent implementation id */
5582                 kfree(clp->cl_implid);
5583                 clp->cl_implid = res.impl_id;
5584
5585                 if (clp->cl_serverscope != NULL &&
5586                     !nfs41_same_server_scope(clp->cl_serverscope,
5587                                              res.server_scope)) {
5588                         dprintk("%s: server_scope mismatch detected\n",
5589                                 __func__);
5590                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5591                         kfree(clp->cl_serverscope);
5592                         clp->cl_serverscope = NULL;
5593                 }
5594
5595                 if (clp->cl_serverscope == NULL) {
5596                         clp->cl_serverscope = res.server_scope;
5597                         goto out;
5598                 }
5599         } else
5600                 kfree(res.impl_id);
5601
5602 out_server_owner:
5603         kfree(res.server_owner);
5604 out_server_scope:
5605         kfree(res.server_scope);
5606 out:
5607         if (clp->cl_implid != NULL)
5608                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5609                         "domain: %s, name: %s, date: %llu,%u\n",
5610                         clp->cl_implid->domain, clp->cl_implid->name,
5611                         clp->cl_implid->date.seconds,
5612                         clp->cl_implid->date.nseconds);
5613         dprintk("NFS reply exchange_id: %d\n", status);
5614         return status;
5615 }
5616
5617 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5618                 struct rpc_cred *cred)
5619 {
5620         struct rpc_message msg = {
5621                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5622                 .rpc_argp = clp,
5623                 .rpc_cred = cred,
5624         };
5625         int status;
5626
5627         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5628         if (status)
5629                 dprintk("NFS: Got error %d from the server %s on "
5630                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5631         return status;
5632 }
5633
5634 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5635                 struct rpc_cred *cred)
5636 {
5637         unsigned int loop;
5638         int ret;
5639
5640         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5641                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5642                 switch (ret) {
5643                 case -NFS4ERR_DELAY:
5644                 case -NFS4ERR_CLIENTID_BUSY:
5645                         ssleep(1);
5646                         break;
5647                 default:
5648                         return ret;
5649                 }
5650         }
5651         return 0;
5652 }
5653
5654 int nfs4_destroy_clientid(struct nfs_client *clp)
5655 {
5656         struct rpc_cred *cred;
5657         int ret = 0;
5658
5659         if (clp->cl_mvops->minor_version < 1)
5660                 goto out;
5661         if (clp->cl_exchange_flags == 0)
5662                 goto out;
5663         if (clp->cl_preserve_clid)
5664                 goto out;
5665         cred = nfs4_get_exchange_id_cred(clp);
5666         ret = nfs4_proc_destroy_clientid(clp, cred);
5667         if (cred)
5668                 put_rpccred(cred);
5669         switch (ret) {
5670         case 0:
5671         case -NFS4ERR_STALE_CLIENTID:
5672                 clp->cl_exchange_flags = 0;
5673         }
5674 out:
5675         return ret;
5676 }
5677
5678 struct nfs4_get_lease_time_data {
5679         struct nfs4_get_lease_time_args *args;
5680         struct nfs4_get_lease_time_res *res;
5681         struct nfs_client *clp;
5682 };
5683
5684 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5685                                         void *calldata)
5686 {
5687         int ret;
5688         struct nfs4_get_lease_time_data *data =
5689                         (struct nfs4_get_lease_time_data *)calldata;
5690
5691         dprintk("--> %s\n", __func__);
5692         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5693         /* just setup sequence, do not trigger session recovery
5694            since we're invoked within one */
5695         ret = nfs41_setup_sequence(data->clp->cl_session,
5696                                    &data->args->la_seq_args,
5697                                    &data->res->lr_seq_res, task);
5698
5699         if (ret != -EAGAIN)
5700                 rpc_call_start(task);
5701         dprintk("<-- %s\n", __func__);
5702 }
5703
5704 /*
5705  * Called from nfs4_state_manager thread for session setup, so don't recover
5706  * from sequence operation or clientid errors.
5707  */
5708 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5709 {
5710         struct nfs4_get_lease_time_data *data =
5711                         (struct nfs4_get_lease_time_data *)calldata;
5712
5713         dprintk("--> %s\n", __func__);
5714         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5715                 return;
5716         switch (task->tk_status) {
5717         case -NFS4ERR_DELAY:
5718         case -NFS4ERR_GRACE:
5719                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5720                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5721                 task->tk_status = 0;
5722                 /* fall through */
5723         case -NFS4ERR_RETRY_UNCACHED_REP:
5724                 rpc_restart_call_prepare(task);
5725                 return;
5726         }
5727         dprintk("<-- %s\n", __func__);
5728 }
5729
5730 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5731         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5732         .rpc_call_done = nfs4_get_lease_time_done,
5733 };
5734
5735 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5736 {
5737         struct rpc_task *task;
5738         struct nfs4_get_lease_time_args args;
5739         struct nfs4_get_lease_time_res res = {
5740                 .lr_fsinfo = fsinfo,
5741         };
5742         struct nfs4_get_lease_time_data data = {
5743                 .args = &args,
5744                 .res = &res,
5745                 .clp = clp,
5746         };
5747         struct rpc_message msg = {
5748                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5749                 .rpc_argp = &args,
5750                 .rpc_resp = &res,
5751         };
5752         struct rpc_task_setup task_setup = {
5753                 .rpc_client = clp->cl_rpcclient,
5754                 .rpc_message = &msg,
5755                 .callback_ops = &nfs4_get_lease_time_ops,
5756                 .callback_data = &data,
5757                 .flags = RPC_TASK_TIMEOUT,
5758         };
5759         int status;
5760
5761         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5762         dprintk("--> %s\n", __func__);
5763         task = rpc_run_task(&task_setup);
5764
5765         if (IS_ERR(task))
5766                 status = PTR_ERR(task);
5767         else {
5768                 status = task->tk_status;
5769                 rpc_put_task(task);
5770         }
5771         dprintk("<-- %s return %d\n", __func__, status);
5772
5773         return status;
5774 }
5775
5776 static int nfs4_grow_slot_table(struct nfs4_slot_table *tbl,
5777                  u32 max_reqs, u32 ivalue)
5778 {
5779         if (max_reqs <= tbl->max_slots)
5780                 return 0;
5781         if (nfs4_find_or_create_slot(tbl, max_reqs - 1, ivalue, GFP_NOFS))
5782                 return 0;
5783         return -ENOMEM;
5784 }
5785
5786 static void nfs4_reset_slot_table(struct nfs4_slot_table *tbl,
5787                 u32 server_highest_slotid,
5788                 u32 ivalue)
5789 {
5790         struct nfs4_slot **p;
5791
5792         nfs4_shrink_slot_table(tbl, server_highest_slotid + 1);
5793         p = &tbl->slots;
5794         while (*p) {
5795                 (*p)->seq_nr = ivalue;
5796                 p = &(*p)->next;
5797         }
5798         tbl->highest_used_slotid = NFS4_NO_SLOT;
5799         tbl->target_highest_slotid = server_highest_slotid;
5800         tbl->server_highest_slotid = server_highest_slotid;
5801         tbl->max_slotid = server_highest_slotid;
5802 }
5803
5804 /*
5805  * (re)Initialise a slot table
5806  */
5807 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl,
5808                 u32 max_reqs, u32 ivalue)
5809 {
5810         int ret;
5811
5812         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5813                 max_reqs, tbl->max_slots);
5814
5815         if (max_reqs > NFS4_MAX_SLOT_TABLE)
5816                 max_reqs = NFS4_MAX_SLOT_TABLE;
5817
5818         ret = nfs4_grow_slot_table(tbl, max_reqs, ivalue);
5819         if (ret)
5820                 goto out;
5821
5822         spin_lock(&tbl->slot_tbl_lock);
5823         nfs4_reset_slot_table(tbl, max_reqs - 1, ivalue);
5824         spin_unlock(&tbl->slot_tbl_lock);
5825
5826         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5827                 tbl, tbl->slots, tbl->max_slots);
5828 out:
5829         dprintk("<-- %s: return %d\n", __func__, ret);
5830         return ret;
5831 }
5832
5833 /* Destroy the slot table */
5834 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5835 {
5836         nfs4_shrink_slot_table(&session->fc_slot_table, 0);
5837         nfs4_shrink_slot_table(&session->bc_slot_table, 0);
5838 }
5839
5840 /*
5841  * Initialize or reset the forechannel and backchannel tables
5842  */
5843 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5844 {
5845         struct nfs4_slot_table *tbl;
5846         int status;
5847
5848         dprintk("--> %s\n", __func__);
5849         /* Fore channel */
5850         tbl = &ses->fc_slot_table;
5851         tbl->session = ses;
5852         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5853         if (status) /* -ENOMEM */
5854                 return status;
5855         /* Back channel */
5856         tbl = &ses->bc_slot_table;
5857         tbl->session = ses;
5858         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5859         if (status && tbl->slots == NULL)
5860                 /* Fore and back channel share a connection so get
5861                  * both slot tables or neither */
5862                 nfs4_destroy_slot_tables(ses);
5863         return status;
5864 }
5865
5866 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5867 {
5868         struct nfs4_session *session;
5869         struct nfs4_slot_table *tbl;
5870
5871         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5872         if (!session)
5873                 return NULL;
5874
5875         tbl = &session->fc_slot_table;
5876         tbl->highest_used_slotid = NFS4_NO_SLOT;
5877         spin_lock_init(&tbl->slot_tbl_lock);
5878         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5879         init_completion(&tbl->complete);
5880
5881         tbl = &session->bc_slot_table;
5882         tbl->highest_used_slotid = NFS4_NO_SLOT;
5883         spin_lock_init(&tbl->slot_tbl_lock);
5884         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5885         init_completion(&tbl->complete);
5886
5887         session->session_state = 1<<NFS4_SESSION_INITING;
5888
5889         session->clp = clp;
5890         return session;
5891 }
5892
5893 void nfs4_destroy_session(struct nfs4_session *session)
5894 {
5895         struct rpc_xprt *xprt;
5896         struct rpc_cred *cred;
5897
5898         cred = nfs4_get_exchange_id_cred(session->clp);
5899         nfs4_proc_destroy_session(session, cred);
5900         if (cred)
5901                 put_rpccred(cred);
5902
5903         rcu_read_lock();
5904         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5905         rcu_read_unlock();
5906         dprintk("%s Destroy backchannel for xprt %p\n",
5907                 __func__, xprt);
5908         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5909         nfs4_destroy_slot_tables(session);
5910         kfree(session);
5911 }
5912
5913 /*
5914  * Initialize the values to be used by the client in CREATE_SESSION
5915  * If nfs4_init_session set the fore channel request and response sizes,
5916  * use them.
5917  *
5918  * Set the back channel max_resp_sz_cached to zero to force the client to
5919  * always set csa_cachethis to FALSE because the current implementation
5920  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5921  */
5922 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5923 {
5924         struct nfs4_session *session = args->client->cl_session;
5925         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5926                      mxresp_sz = session->fc_target_max_resp_sz;
5927
5928         if (mxrqst_sz == 0)
5929                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5930         if (mxresp_sz == 0)
5931                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5932         /* Fore channel attributes */
5933         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5934         args->fc_attrs.max_resp_sz = mxresp_sz;
5935         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5936         args->fc_attrs.max_reqs = max_session_slots;
5937
5938         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5939                 "max_ops=%u max_reqs=%u\n",
5940                 __func__,
5941                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5942                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5943
5944         /* Back channel attributes */
5945         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5946         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5947         args->bc_attrs.max_resp_sz_cached = 0;
5948         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5949         args->bc_attrs.max_reqs = 1;
5950
5951         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5952                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5953                 __func__,
5954                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5955                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5956                 args->bc_attrs.max_reqs);
5957 }
5958
5959 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5960 {
5961         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5962         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5963
5964         if (rcvd->max_resp_sz > sent->max_resp_sz)
5965                 return -EINVAL;
5966         /*
5967          * Our requested max_ops is the minimum we need; we're not
5968          * prepared to break up compounds into smaller pieces than that.
5969          * So, no point even trying to continue if the server won't
5970          * cooperate:
5971          */
5972         if (rcvd->max_ops < sent->max_ops)
5973                 return -EINVAL;
5974         if (rcvd->max_reqs == 0)
5975                 return -EINVAL;
5976         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5977                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5978         return 0;
5979 }
5980
5981 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5982 {
5983         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5984         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5985
5986         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5987                 return -EINVAL;
5988         if (rcvd->max_resp_sz < sent->max_resp_sz)
5989                 return -EINVAL;
5990         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5991                 return -EINVAL;
5992         /* These would render the backchannel useless: */
5993         if (rcvd->max_ops != sent->max_ops)
5994                 return -EINVAL;
5995         if (rcvd->max_reqs != sent->max_reqs)
5996                 return -EINVAL;
5997         return 0;
5998 }
5999
6000 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
6001                                      struct nfs4_session *session)
6002 {
6003         int ret;
6004
6005         ret = nfs4_verify_fore_channel_attrs(args, session);
6006         if (ret)
6007                 return ret;
6008         return nfs4_verify_back_channel_attrs(args, session);
6009 }
6010
6011 static int _nfs4_proc_create_session(struct nfs_client *clp,
6012                 struct rpc_cred *cred)
6013 {
6014         struct nfs4_session *session = clp->cl_session;
6015         struct nfs41_create_session_args args = {
6016                 .client = clp,
6017                 .cb_program = NFS4_CALLBACK,
6018         };
6019         struct nfs41_create_session_res res = {
6020                 .client = clp,
6021         };
6022         struct rpc_message msg = {
6023                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
6024                 .rpc_argp = &args,
6025                 .rpc_resp = &res,
6026                 .rpc_cred = cred,
6027         };
6028         int status;
6029
6030         nfs4_init_channel_attrs(&args);
6031         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
6032
6033         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6034
6035         if (!status) {
6036                 /* Verify the session's negotiated channel_attrs values */
6037                 status = nfs4_verify_channel_attrs(&args, session);
6038                 /* Increment the clientid slot sequence id */
6039                 clp->cl_seqid++;
6040         }
6041
6042         return status;
6043 }
6044
6045 /*
6046  * Issues a CREATE_SESSION operation to the server.
6047  * It is the responsibility of the caller to verify the session is
6048  * expired before calling this routine.
6049  */
6050 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
6051 {
6052         int status;
6053         unsigned *ptr;
6054         struct nfs4_session *session = clp->cl_session;
6055
6056         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
6057
6058         status = _nfs4_proc_create_session(clp, cred);
6059         if (status)
6060                 goto out;
6061
6062         /* Init or reset the session slot tables */
6063         status = nfs4_setup_session_slot_tables(session);
6064         dprintk("slot table setup returned %d\n", status);
6065         if (status)
6066                 goto out;
6067
6068         ptr = (unsigned *)&session->sess_id.data[0];
6069         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
6070                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
6071 out:
6072         dprintk("<-- %s\n", __func__);
6073         return status;
6074 }
6075
6076 /*
6077  * Issue the over-the-wire RPC DESTROY_SESSION.
6078  * The caller must serialize access to this routine.
6079  */
6080 int nfs4_proc_destroy_session(struct nfs4_session *session,
6081                 struct rpc_cred *cred)
6082 {
6083         struct rpc_message msg = {
6084                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
6085                 .rpc_argp = session,
6086                 .rpc_cred = cred,
6087         };
6088         int status = 0;
6089
6090         dprintk("--> nfs4_proc_destroy_session\n");
6091
6092         /* session is still being setup */
6093         if (session->clp->cl_cons_state != NFS_CS_READY)
6094                 return status;
6095
6096         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6097
6098         if (status)
6099                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
6100                         "Session has been destroyed regardless...\n", status);
6101
6102         dprintk("<-- nfs4_proc_destroy_session\n");
6103         return status;
6104 }
6105
6106 /*
6107  * With sessions, the client is not marked ready until after a
6108  * successful EXCHANGE_ID and CREATE_SESSION.
6109  *
6110  * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
6111  * other versions of NFS can be tried.
6112  */
6113 static int nfs41_check_session_ready(struct nfs_client *clp)
6114 {
6115         int ret;
6116
6117         if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
6118                 ret = nfs4_client_recover_expired_lease(clp);
6119                 if (ret)
6120                         return ret;
6121         }
6122         if (clp->cl_cons_state < NFS_CS_READY)
6123                 return -EPROTONOSUPPORT;
6124         smp_rmb();
6125         return 0;
6126 }
6127
6128 int nfs4_init_session(struct nfs_server *server)
6129 {
6130         struct nfs_client *clp = server->nfs_client;
6131         struct nfs4_session *session;
6132         unsigned int target_max_rqst_sz = NFS_MAX_FILE_IO_SIZE;
6133         unsigned int target_max_resp_sz = NFS_MAX_FILE_IO_SIZE;
6134
6135         if (!nfs4_has_session(clp))
6136                 return 0;
6137
6138         if (server->rsize != 0)
6139                 target_max_resp_sz = server->rsize;
6140         target_max_resp_sz += nfs41_maxread_overhead;
6141
6142         if (server->wsize != 0)
6143                 target_max_rqst_sz = server->wsize;
6144         target_max_rqst_sz += nfs41_maxwrite_overhead;
6145
6146         session = clp->cl_session;
6147         spin_lock(&clp->cl_lock);
6148         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
6149                 /* Initialise targets and channel attributes */
6150                 session->fc_target_max_rqst_sz = target_max_rqst_sz;
6151                 session->fc_attrs.max_rqst_sz = target_max_rqst_sz;
6152                 session->fc_target_max_resp_sz = target_max_resp_sz;
6153                 session->fc_attrs.max_resp_sz = target_max_resp_sz;
6154         } else {
6155                 /* Just adjust the targets */
6156                 if (target_max_rqst_sz > session->fc_target_max_rqst_sz) {
6157                         session->fc_target_max_rqst_sz = target_max_rqst_sz;
6158                         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
6159                 }
6160                 if (target_max_resp_sz > session->fc_target_max_resp_sz) {
6161                         session->fc_target_max_resp_sz = target_max_resp_sz;
6162                         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
6163                 }
6164         }
6165         spin_unlock(&clp->cl_lock);
6166
6167         if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
6168                 nfs4_schedule_lease_recovery(clp);
6169
6170         return nfs41_check_session_ready(clp);
6171 }
6172
6173 int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time)
6174 {
6175         struct nfs4_session *session = clp->cl_session;
6176         int ret;
6177
6178         spin_lock(&clp->cl_lock);
6179         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
6180                 /*
6181                  * Do not set NFS_CS_CHECK_LEASE_TIME instead set the
6182                  * DS lease to be equal to the MDS lease.
6183                  */
6184                 clp->cl_lease_time = lease_time;
6185                 clp->cl_last_renewal = jiffies;
6186         }
6187         spin_unlock(&clp->cl_lock);
6188
6189         ret = nfs41_check_session_ready(clp);
6190         if (ret)
6191                 return ret;
6192         /* Test for the DS role */
6193         if (!is_ds_client(clp))
6194                 return -ENODEV;
6195         return 0;
6196 }
6197 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
6198
6199
6200 /*
6201  * Renew the cl_session lease.
6202  */
6203 struct nfs4_sequence_data {
6204         struct nfs_client *clp;
6205         struct nfs4_sequence_args args;
6206         struct nfs4_sequence_res res;
6207 };
6208
6209 static void nfs41_sequence_release(void *data)
6210 {
6211         struct nfs4_sequence_data *calldata = data;
6212         struct nfs_client *clp = calldata->clp;
6213
6214         if (atomic_read(&clp->cl_count) > 1)
6215                 nfs4_schedule_state_renewal(clp);
6216         nfs_put_client(clp);
6217         kfree(calldata);
6218 }
6219
6220 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6221 {
6222         switch(task->tk_status) {
6223         case -NFS4ERR_DELAY:
6224                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6225                 return -EAGAIN;
6226         default:
6227                 nfs4_schedule_lease_recovery(clp);
6228         }
6229         return 0;
6230 }
6231
6232 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6233 {
6234         struct nfs4_sequence_data *calldata = data;
6235         struct nfs_client *clp = calldata->clp;
6236
6237         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6238                 return;
6239
6240         if (task->tk_status < 0) {
6241                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6242                 if (atomic_read(&clp->cl_count) == 1)
6243                         goto out;
6244
6245                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6246                         rpc_restart_call_prepare(task);
6247                         return;
6248                 }
6249         }
6250         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6251 out:
6252         dprintk("<-- %s\n", __func__);
6253 }
6254
6255 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6256 {
6257         struct nfs4_sequence_data *calldata = data;
6258         struct nfs_client *clp = calldata->clp;
6259         struct nfs4_sequence_args *args;
6260         struct nfs4_sequence_res *res;
6261
6262         args = task->tk_msg.rpc_argp;
6263         res = task->tk_msg.rpc_resp;
6264
6265         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
6266                 return;
6267         rpc_call_start(task);
6268 }
6269
6270 static void nfs41_sequence_prepare_privileged(struct rpc_task *task, void *data)
6271 {
6272         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
6273         nfs41_sequence_prepare(task, data);
6274 }
6275
6276 static const struct rpc_call_ops nfs41_sequence_ops = {
6277         .rpc_call_done = nfs41_sequence_call_done,
6278         .rpc_call_prepare = nfs41_sequence_prepare,
6279         .rpc_release = nfs41_sequence_release,
6280 };
6281
6282 static const struct rpc_call_ops nfs41_sequence_privileged_ops = {
6283         .rpc_call_done = nfs41_sequence_call_done,
6284         .rpc_call_prepare = nfs41_sequence_prepare_privileged,
6285         .rpc_release = nfs41_sequence_release,
6286 };
6287
6288 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred,
6289                                              const struct rpc_call_ops *seq_ops)
6290 {
6291         struct nfs4_sequence_data *calldata;
6292         struct rpc_message msg = {
6293                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6294                 .rpc_cred = cred,
6295         };
6296         struct rpc_task_setup task_setup_data = {
6297                 .rpc_client = clp->cl_rpcclient,
6298                 .rpc_message = &msg,
6299                 .callback_ops = seq_ops,
6300                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
6301         };
6302
6303         if (!atomic_inc_not_zero(&clp->cl_count))
6304                 return ERR_PTR(-EIO);
6305         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6306         if (calldata == NULL) {
6307                 nfs_put_client(clp);
6308                 return ERR_PTR(-ENOMEM);
6309         }
6310         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
6311         msg.rpc_argp = &calldata->args;
6312         msg.rpc_resp = &calldata->res;
6313         calldata->clp = clp;
6314         task_setup_data.callback_data = calldata;
6315
6316         return rpc_run_task(&task_setup_data);
6317 }
6318
6319 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6320 {
6321         struct rpc_task *task;
6322         int ret = 0;
6323
6324         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6325                 return 0;
6326         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_ops);
6327         if (IS_ERR(task))
6328                 ret = PTR_ERR(task);
6329         else
6330                 rpc_put_task_async(task);
6331         dprintk("<-- %s status=%d\n", __func__, ret);
6332         return ret;
6333 }
6334
6335 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6336 {
6337         struct rpc_task *task;
6338         int ret;
6339
6340         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_privileged_ops);
6341         if (IS_ERR(task)) {
6342                 ret = PTR_ERR(task);
6343                 goto out;
6344         }
6345         ret = rpc_wait_for_completion_task(task);
6346         if (!ret) {
6347                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6348
6349                 if (task->tk_status == 0)
6350                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6351                 ret = task->tk_status;
6352         }
6353         rpc_put_task(task);
6354 out:
6355         dprintk("<-- %s status=%d\n", __func__, ret);
6356         return ret;
6357 }
6358
6359 struct nfs4_reclaim_complete_data {
6360         struct nfs_client *clp;
6361         struct nfs41_reclaim_complete_args arg;
6362         struct nfs41_reclaim_complete_res res;
6363 };
6364
6365 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6366 {
6367         struct nfs4_reclaim_complete_data *calldata = data;
6368
6369         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
6370         if (nfs41_setup_sequence(calldata->clp->cl_session,
6371                                 &calldata->arg.seq_args,
6372                                 &calldata->res.seq_res, task))
6373                 return;
6374
6375         rpc_call_start(task);
6376 }
6377
6378 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6379 {
6380         switch(task->tk_status) {
6381         case 0:
6382         case -NFS4ERR_COMPLETE_ALREADY:
6383         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6384                 break;
6385         case -NFS4ERR_DELAY:
6386                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6387                 /* fall through */
6388         case -NFS4ERR_RETRY_UNCACHED_REP:
6389                 return -EAGAIN;
6390         default:
6391                 nfs4_schedule_lease_recovery(clp);
6392         }
6393         return 0;
6394 }
6395
6396 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6397 {
6398         struct nfs4_reclaim_complete_data *calldata = data;
6399         struct nfs_client *clp = calldata->clp;
6400         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6401
6402         dprintk("--> %s\n", __func__);
6403         if (!nfs41_sequence_done(task, res))
6404                 return;
6405
6406         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6407                 rpc_restart_call_prepare(task);
6408                 return;
6409         }
6410         dprintk("<-- %s\n", __func__);
6411 }
6412
6413 static void nfs4_free_reclaim_complete_data(void *data)
6414 {
6415         struct nfs4_reclaim_complete_data *calldata = data;
6416
6417         kfree(calldata);
6418 }
6419
6420 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6421         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6422         .rpc_call_done = nfs4_reclaim_complete_done,
6423         .rpc_release = nfs4_free_reclaim_complete_data,
6424 };
6425
6426 /*
6427  * Issue a global reclaim complete.
6428  */
6429 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6430 {
6431         struct nfs4_reclaim_complete_data *calldata;
6432         struct rpc_task *task;
6433         struct rpc_message msg = {
6434                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6435         };
6436         struct rpc_task_setup task_setup_data = {
6437                 .rpc_client = clp->cl_rpcclient,
6438                 .rpc_message = &msg,
6439                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6440                 .flags = RPC_TASK_ASYNC,
6441         };
6442         int status = -ENOMEM;
6443
6444         dprintk("--> %s\n", __func__);
6445         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6446         if (calldata == NULL)
6447                 goto out;
6448         calldata->clp = clp;
6449         calldata->arg.one_fs = 0;
6450
6451         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6452         msg.rpc_argp = &calldata->arg;
6453         msg.rpc_resp = &calldata->res;
6454         task_setup_data.callback_data = calldata;
6455         task = rpc_run_task(&task_setup_data);
6456         if (IS_ERR(task)) {
6457                 status = PTR_ERR(task);
6458                 goto out;
6459         }
6460         status = nfs4_wait_for_completion_rpc_task(task);
6461         if (status == 0)
6462                 status = task->tk_status;
6463         rpc_put_task(task);
6464         return 0;
6465 out:
6466         dprintk("<-- %s status=%d\n", __func__, status);
6467         return status;
6468 }
6469
6470 static void
6471 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6472 {
6473         struct nfs4_layoutget *lgp = calldata;
6474         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6475
6476         dprintk("--> %s\n", __func__);
6477         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6478          * right now covering the LAYOUTGET we are about to send.
6479          * However, that is not so catastrophic, and there seems
6480          * to be no way to prevent it completely.
6481          */
6482         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6483                                 &lgp->res.seq_res, task))
6484                 return;
6485         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6486                                           NFS_I(lgp->args.inode)->layout,
6487                                           lgp->args.ctx->state)) {
6488                 rpc_exit(task, NFS4_OK);
6489                 return;
6490         }
6491         rpc_call_start(task);
6492 }
6493
6494 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6495 {
6496         struct nfs4_layoutget *lgp = calldata;
6497         struct inode *inode = lgp->args.inode;
6498         struct nfs_server *server = NFS_SERVER(inode);
6499         struct pnfs_layout_hdr *lo;
6500         struct nfs4_state *state = NULL;
6501
6502         dprintk("--> %s\n", __func__);
6503
6504         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6505                 goto out;
6506
6507         switch (task->tk_status) {
6508         case 0:
6509                 goto out;
6510         case -NFS4ERR_LAYOUTTRYLATER:
6511         case -NFS4ERR_RECALLCONFLICT:
6512                 task->tk_status = -NFS4ERR_DELAY;
6513                 break;
6514         case -NFS4ERR_EXPIRED:
6515         case -NFS4ERR_BAD_STATEID:
6516                 spin_lock(&inode->i_lock);
6517                 lo = NFS_I(inode)->layout;
6518                 if (!lo || list_empty(&lo->plh_segs)) {
6519                         spin_unlock(&inode->i_lock);
6520                         /* If the open stateid was bad, then recover it. */
6521                         state = lgp->args.ctx->state;
6522                 } else {
6523                         LIST_HEAD(head);
6524
6525                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6526                         spin_unlock(&inode->i_lock);
6527                         /* Mark the bad layout state as invalid, then
6528                          * retry using the open stateid. */
6529                         pnfs_free_lseg_list(&head);
6530                 }
6531         }
6532         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6533                 rpc_restart_call_prepare(task);
6534 out:
6535         dprintk("<-- %s\n", __func__);
6536 }
6537
6538 static size_t max_response_pages(struct nfs_server *server)
6539 {
6540         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6541         return nfs_page_array_len(0, max_resp_sz);
6542 }
6543
6544 static void nfs4_free_pages(struct page **pages, size_t size)
6545 {
6546         int i;
6547
6548         if (!pages)
6549                 return;
6550
6551         for (i = 0; i < size; i++) {
6552                 if (!pages[i])
6553                         break;
6554                 __free_page(pages[i]);
6555         }
6556         kfree(pages);
6557 }
6558
6559 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6560 {
6561         struct page **pages;
6562         int i;
6563
6564         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6565         if (!pages) {
6566                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6567                 return NULL;
6568         }
6569
6570         for (i = 0; i < size; i++) {
6571                 pages[i] = alloc_page(gfp_flags);
6572                 if (!pages[i]) {
6573                         dprintk("%s: failed to allocate page\n", __func__);
6574                         nfs4_free_pages(pages, size);
6575                         return NULL;
6576                 }
6577         }
6578
6579         return pages;
6580 }
6581
6582 static void nfs4_layoutget_release(void *calldata)
6583 {
6584         struct nfs4_layoutget *lgp = calldata;
6585         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6586         size_t max_pages = max_response_pages(server);
6587
6588         dprintk("--> %s\n", __func__);
6589         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6590         put_nfs_open_context(lgp->args.ctx);
6591         kfree(calldata);
6592         dprintk("<-- %s\n", __func__);
6593 }
6594
6595 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6596         .rpc_call_prepare = nfs4_layoutget_prepare,
6597         .rpc_call_done = nfs4_layoutget_done,
6598         .rpc_release = nfs4_layoutget_release,
6599 };
6600
6601 struct pnfs_layout_segment *
6602 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6603 {
6604         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6605         size_t max_pages = max_response_pages(server);
6606         struct rpc_task *task;
6607         struct rpc_message msg = {
6608                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6609                 .rpc_argp = &lgp->args,
6610                 .rpc_resp = &lgp->res,
6611         };
6612         struct rpc_task_setup task_setup_data = {
6613                 .rpc_client = server->client,
6614                 .rpc_message = &msg,
6615                 .callback_ops = &nfs4_layoutget_call_ops,
6616                 .callback_data = lgp,
6617                 .flags = RPC_TASK_ASYNC,
6618         };
6619         struct pnfs_layout_segment *lseg = NULL;
6620         int status = 0;
6621
6622         dprintk("--> %s\n", __func__);
6623
6624         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6625         if (!lgp->args.layout.pages) {
6626                 nfs4_layoutget_release(lgp);
6627                 return ERR_PTR(-ENOMEM);
6628         }
6629         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6630
6631         lgp->res.layoutp = &lgp->args.layout;
6632         lgp->res.seq_res.sr_slot = NULL;
6633         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6634         task = rpc_run_task(&task_setup_data);
6635         if (IS_ERR(task))
6636                 return ERR_CAST(task);
6637         status = nfs4_wait_for_completion_rpc_task(task);
6638         if (status == 0)
6639                 status = task->tk_status;
6640         if (status == 0)
6641                 lseg = pnfs_layout_process(lgp);
6642         rpc_put_task(task);
6643         dprintk("<-- %s status=%d\n", __func__, status);
6644         if (status)
6645                 return ERR_PTR(status);
6646         return lseg;
6647 }
6648
6649 static void
6650 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6651 {
6652         struct nfs4_layoutreturn *lrp = calldata;
6653
6654         dprintk("--> %s\n", __func__);
6655         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6656                                 &lrp->res.seq_res, task))
6657                 return;
6658         rpc_call_start(task);
6659 }
6660
6661 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6662 {
6663         struct nfs4_layoutreturn *lrp = calldata;
6664         struct nfs_server *server;
6665
6666         dprintk("--> %s\n", __func__);
6667
6668         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6669                 return;
6670
6671         server = NFS_SERVER(lrp->args.inode);
6672         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6673                 rpc_restart_call_prepare(task);
6674                 return;
6675         }
6676         dprintk("<-- %s\n", __func__);
6677 }
6678
6679 static void nfs4_layoutreturn_release(void *calldata)
6680 {
6681         struct nfs4_layoutreturn *lrp = calldata;
6682         struct pnfs_layout_hdr *lo = lrp->args.layout;
6683
6684         dprintk("--> %s\n", __func__);
6685         spin_lock(&lo->plh_inode->i_lock);
6686         if (lrp->res.lrs_present)
6687                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6688         lo->plh_block_lgets--;
6689         spin_unlock(&lo->plh_inode->i_lock);
6690         pnfs_put_layout_hdr(lrp->args.layout);
6691         kfree(calldata);
6692         dprintk("<-- %s\n", __func__);
6693 }
6694
6695 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6696         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6697         .rpc_call_done = nfs4_layoutreturn_done,
6698         .rpc_release = nfs4_layoutreturn_release,
6699 };
6700
6701 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6702 {
6703         struct rpc_task *task;
6704         struct rpc_message msg = {
6705                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6706                 .rpc_argp = &lrp->args,
6707                 .rpc_resp = &lrp->res,
6708         };
6709         struct rpc_task_setup task_setup_data = {
6710                 .rpc_client = lrp->clp->cl_rpcclient,
6711                 .rpc_message = &msg,
6712                 .callback_ops = &nfs4_layoutreturn_call_ops,
6713                 .callback_data = lrp,
6714         };
6715         int status;
6716
6717         dprintk("--> %s\n", __func__);
6718         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6719         task = rpc_run_task(&task_setup_data);
6720         if (IS_ERR(task))
6721                 return PTR_ERR(task);
6722         status = task->tk_status;
6723         dprintk("<-- %s status=%d\n", __func__, status);
6724         rpc_put_task(task);
6725         return status;
6726 }
6727
6728 /*
6729  * Retrieve the list of Data Server devices from the MDS.
6730  */
6731 static int _nfs4_getdevicelist(struct nfs_server *server,
6732                                     const struct nfs_fh *fh,
6733                                     struct pnfs_devicelist *devlist)
6734 {
6735         struct nfs4_getdevicelist_args args = {
6736                 .fh = fh,
6737                 .layoutclass = server->pnfs_curr_ld->id,
6738         };
6739         struct nfs4_getdevicelist_res res = {
6740                 .devlist = devlist,
6741         };
6742         struct rpc_message msg = {
6743                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6744                 .rpc_argp = &args,
6745                 .rpc_resp = &res,
6746         };
6747         int status;
6748
6749         dprintk("--> %s\n", __func__);
6750         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6751                                 &res.seq_res, 0);
6752         dprintk("<-- %s status=%d\n", __func__, status);
6753         return status;
6754 }
6755
6756 int nfs4_proc_getdevicelist(struct nfs_server *server,
6757                             const struct nfs_fh *fh,
6758                             struct pnfs_devicelist *devlist)
6759 {
6760         struct nfs4_exception exception = { };
6761         int err;
6762
6763         do {
6764                 err = nfs4_handle_exception(server,
6765                                 _nfs4_getdevicelist(server, fh, devlist),
6766                                 &exception);
6767         } while (exception.retry);
6768
6769         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6770                 err, devlist->num_devs);
6771
6772         return err;
6773 }
6774 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6775
6776 static int
6777 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6778 {
6779         struct nfs4_getdeviceinfo_args args = {
6780                 .pdev = pdev,
6781         };
6782         struct nfs4_getdeviceinfo_res res = {
6783                 .pdev = pdev,
6784         };
6785         struct rpc_message msg = {
6786                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6787                 .rpc_argp = &args,
6788                 .rpc_resp = &res,
6789         };
6790         int status;
6791
6792         dprintk("--> %s\n", __func__);
6793         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6794         dprintk("<-- %s status=%d\n", __func__, status);
6795
6796         return status;
6797 }
6798
6799 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6800 {
6801         struct nfs4_exception exception = { };
6802         int err;
6803
6804         do {
6805                 err = nfs4_handle_exception(server,
6806                                         _nfs4_proc_getdeviceinfo(server, pdev),
6807                                         &exception);
6808         } while (exception.retry);
6809         return err;
6810 }
6811 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6812
6813 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6814 {
6815         struct nfs4_layoutcommit_data *data = calldata;
6816         struct nfs_server *server = NFS_SERVER(data->args.inode);
6817
6818         if (nfs4_setup_sequence(server, &data->args.seq_args,
6819                                 &data->res.seq_res, task))
6820                 return;
6821         rpc_call_start(task);
6822 }
6823
6824 static void
6825 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6826 {
6827         struct nfs4_layoutcommit_data *data = calldata;
6828         struct nfs_server *server = NFS_SERVER(data->args.inode);
6829
6830         if (!nfs4_sequence_done(task, &data->res.seq_res))
6831                 return;
6832
6833         switch (task->tk_status) { /* Just ignore these failures */
6834         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6835         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6836         case -NFS4ERR_BADLAYOUT:     /* no layout */
6837         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6838                 task->tk_status = 0;
6839                 break;
6840         case 0:
6841                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6842                                                    data->res.fattr);
6843                 break;
6844         default:
6845                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6846                         rpc_restart_call_prepare(task);
6847                         return;
6848                 }
6849         }
6850 }
6851
6852 static void nfs4_layoutcommit_release(void *calldata)
6853 {
6854         struct nfs4_layoutcommit_data *data = calldata;
6855         struct pnfs_layout_segment *lseg, *tmp;
6856         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6857
6858         pnfs_cleanup_layoutcommit(data);
6859         /* Matched by references in pnfs_set_layoutcommit */
6860         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6861                 list_del_init(&lseg->pls_lc_list);
6862                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6863                                        &lseg->pls_flags))
6864                         pnfs_put_lseg(lseg);
6865         }
6866
6867         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6868         smp_mb__after_clear_bit();
6869         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6870
6871         put_rpccred(data->cred);
6872         kfree(data);
6873 }
6874
6875 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6876         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6877         .rpc_call_done = nfs4_layoutcommit_done,
6878         .rpc_release = nfs4_layoutcommit_release,
6879 };
6880
6881 int
6882 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6883 {
6884         struct rpc_message msg = {
6885                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6886                 .rpc_argp = &data->args,
6887                 .rpc_resp = &data->res,
6888                 .rpc_cred = data->cred,
6889         };
6890         struct rpc_task_setup task_setup_data = {
6891                 .task = &data->task,
6892                 .rpc_client = NFS_CLIENT(data->args.inode),
6893                 .rpc_message = &msg,
6894                 .callback_ops = &nfs4_layoutcommit_ops,
6895                 .callback_data = data,
6896                 .flags = RPC_TASK_ASYNC,
6897         };
6898         struct rpc_task *task;
6899         int status = 0;
6900
6901         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6902                 "lbw: %llu inode %lu\n",
6903                 data->task.tk_pid, sync,
6904                 data->args.lastbytewritten,
6905                 data->args.inode->i_ino);
6906
6907         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6908         task = rpc_run_task(&task_setup_data);
6909         if (IS_ERR(task))
6910                 return PTR_ERR(task);
6911         if (sync == false)
6912                 goto out;
6913         status = nfs4_wait_for_completion_rpc_task(task);
6914         if (status != 0)
6915                 goto out;
6916         status = task->tk_status;
6917 out:
6918         dprintk("%s: status %d\n", __func__, status);
6919         rpc_put_task(task);
6920         return status;
6921 }
6922
6923 static int
6924 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6925                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6926 {
6927         struct nfs41_secinfo_no_name_args args = {
6928                 .style = SECINFO_STYLE_CURRENT_FH,
6929         };
6930         struct nfs4_secinfo_res res = {
6931                 .flavors = flavors,
6932         };
6933         struct rpc_message msg = {
6934                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6935                 .rpc_argp = &args,
6936                 .rpc_resp = &res,
6937         };
6938         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6939 }
6940
6941 static int
6942 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6943                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6944 {
6945         struct nfs4_exception exception = { };
6946         int err;
6947         do {
6948                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6949                 switch (err) {
6950                 case 0:
6951                 case -NFS4ERR_WRONGSEC:
6952                 case -NFS4ERR_NOTSUPP:
6953                         goto out;
6954                 default:
6955                         err = nfs4_handle_exception(server, err, &exception);
6956                 }
6957         } while (exception.retry);
6958 out:
6959         return err;
6960 }
6961
6962 static int
6963 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6964                     struct nfs_fsinfo *info)
6965 {
6966         int err;
6967         struct page *page;
6968         rpc_authflavor_t flavor;
6969         struct nfs4_secinfo_flavors *flavors;
6970
6971         page = alloc_page(GFP_KERNEL);
6972         if (!page) {
6973                 err = -ENOMEM;
6974                 goto out;
6975         }
6976
6977         flavors = page_address(page);
6978         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6979
6980         /*
6981          * Fall back on "guess and check" method if
6982          * the server doesn't support SECINFO_NO_NAME
6983          */
6984         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6985                 err = nfs4_find_root_sec(server, fhandle, info);
6986                 goto out_freepage;
6987         }
6988         if (err)
6989                 goto out_freepage;
6990
6991         flavor = nfs_find_best_sec(flavors);
6992         if (err == 0)
6993                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6994
6995 out_freepage:
6996         put_page(page);
6997         if (err == -EACCES)
6998                 return -EPERM;
6999 out:
7000         return err;
7001 }
7002
7003 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
7004 {
7005         int status;
7006         struct nfs41_test_stateid_args args = {
7007                 .stateid = stateid,
7008         };
7009         struct nfs41_test_stateid_res res;
7010         struct rpc_message msg = {
7011                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
7012                 .rpc_argp = &args,
7013                 .rpc_resp = &res,
7014         };
7015
7016         dprintk("NFS call  test_stateid %p\n", stateid);
7017         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
7018         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
7019         if (status != NFS_OK) {
7020                 dprintk("NFS reply test_stateid: failed, %d\n", status);
7021                 return status;
7022         }
7023         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
7024         return -res.status;
7025 }
7026
7027 /**
7028  * nfs41_test_stateid - perform a TEST_STATEID operation
7029  *
7030  * @server: server / transport on which to perform the operation
7031  * @stateid: state ID to test
7032  *
7033  * Returns NFS_OK if the server recognizes that "stateid" is valid.
7034  * Otherwise a negative NFS4ERR value is returned if the operation
7035  * failed or the state ID is not currently valid.
7036  */
7037 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
7038 {
7039         struct nfs4_exception exception = { };
7040         int err;
7041         do {
7042                 err = _nfs41_test_stateid(server, stateid);
7043                 if (err != -NFS4ERR_DELAY)
7044                         break;
7045                 nfs4_handle_exception(server, err, &exception);
7046         } while (exception.retry);
7047         return err;
7048 }
7049
7050 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
7051 {
7052         struct nfs41_free_stateid_args args = {
7053                 .stateid = stateid,
7054         };
7055         struct nfs41_free_stateid_res res;
7056         struct rpc_message msg = {
7057                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
7058                 .rpc_argp = &args,
7059                 .rpc_resp = &res,
7060         };
7061         int status;
7062
7063         dprintk("NFS call  free_stateid %p\n", stateid);
7064         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
7065         status = nfs4_call_sync_sequence(server->client, server, &msg,
7066                                          &args.seq_args, &res.seq_res, 1);
7067         dprintk("NFS reply free_stateid: %d\n", status);
7068         return status;
7069 }
7070
7071 /**
7072  * nfs41_free_stateid - perform a FREE_STATEID operation
7073  *
7074  * @server: server / transport on which to perform the operation
7075  * @stateid: state ID to release
7076  *
7077  * Returns NFS_OK if the server freed "stateid".  Otherwise a
7078  * negative NFS4ERR value is returned.
7079  */
7080 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
7081 {
7082         struct nfs4_exception exception = { };
7083         int err;
7084         do {
7085                 err = _nfs4_free_stateid(server, stateid);
7086                 if (err != -NFS4ERR_DELAY)
7087                         break;
7088                 nfs4_handle_exception(server, err, &exception);
7089         } while (exception.retry);
7090         return err;
7091 }
7092
7093 static bool nfs41_match_stateid(const nfs4_stateid *s1,
7094                 const nfs4_stateid *s2)
7095 {
7096         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
7097                 return false;
7098
7099         if (s1->seqid == s2->seqid)
7100                 return true;
7101         if (s1->seqid == 0 || s2->seqid == 0)
7102                 return true;
7103
7104         return false;
7105 }
7106
7107 #endif /* CONFIG_NFS_V4_1 */
7108
7109 static bool nfs4_match_stateid(const nfs4_stateid *s1,
7110                 const nfs4_stateid *s2)
7111 {
7112         return nfs4_stateid_match(s1, s2);
7113 }
7114
7115
7116 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
7117         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7118         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7119         .recover_open   = nfs4_open_reclaim,
7120         .recover_lock   = nfs4_lock_reclaim,
7121         .establish_clid = nfs4_init_clientid,
7122         .get_clid_cred  = nfs4_get_setclientid_cred,
7123         .detect_trunking = nfs40_discover_server_trunking,
7124 };
7125
7126 #if defined(CONFIG_NFS_V4_1)
7127 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
7128         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7129         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7130         .recover_open   = nfs4_open_reclaim,
7131         .recover_lock   = nfs4_lock_reclaim,
7132         .establish_clid = nfs41_init_clientid,
7133         .get_clid_cred  = nfs4_get_exchange_id_cred,
7134         .reclaim_complete = nfs41_proc_reclaim_complete,
7135         .detect_trunking = nfs41_discover_server_trunking,
7136 };
7137 #endif /* CONFIG_NFS_V4_1 */
7138
7139 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
7140         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7141         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7142         .recover_open   = nfs4_open_expired,
7143         .recover_lock   = nfs4_lock_expired,
7144         .establish_clid = nfs4_init_clientid,
7145         .get_clid_cred  = nfs4_get_setclientid_cred,
7146 };
7147
7148 #if defined(CONFIG_NFS_V4_1)
7149 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
7150         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7151         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7152         .recover_open   = nfs41_open_expired,
7153         .recover_lock   = nfs41_lock_expired,
7154         .establish_clid = nfs41_init_clientid,
7155         .get_clid_cred  = nfs4_get_exchange_id_cred,
7156 };
7157 #endif /* CONFIG_NFS_V4_1 */
7158
7159 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
7160         .sched_state_renewal = nfs4_proc_async_renew,
7161         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
7162         .renew_lease = nfs4_proc_renew,
7163 };
7164
7165 #if defined(CONFIG_NFS_V4_1)
7166 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
7167         .sched_state_renewal = nfs41_proc_async_sequence,
7168         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
7169         .renew_lease = nfs4_proc_sequence,
7170 };
7171 #endif
7172
7173 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
7174         .minor_version = 0,
7175         .call_sync = _nfs4_call_sync,
7176         .match_stateid = nfs4_match_stateid,
7177         .find_root_sec = nfs4_find_root_sec,
7178         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
7179         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
7180         .state_renewal_ops = &nfs40_state_renewal_ops,
7181 };
7182
7183 #if defined(CONFIG_NFS_V4_1)
7184 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
7185         .minor_version = 1,
7186         .call_sync = _nfs4_call_sync_session,
7187         .match_stateid = nfs41_match_stateid,
7188         .find_root_sec = nfs41_find_root_sec,
7189         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7190         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7191         .state_renewal_ops = &nfs41_state_renewal_ops,
7192 };
7193 #endif
7194
7195 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
7196         [0] = &nfs_v4_0_minor_ops,
7197 #if defined(CONFIG_NFS_V4_1)
7198         [1] = &nfs_v4_1_minor_ops,
7199 #endif
7200 };
7201
7202 const struct inode_operations nfs4_dir_inode_operations = {
7203         .create         = nfs_create,
7204         .lookup         = nfs_lookup,
7205         .atomic_open    = nfs_atomic_open,
7206         .link           = nfs_link,
7207         .unlink         = nfs_unlink,
7208         .symlink        = nfs_symlink,
7209         .mkdir          = nfs_mkdir,
7210         .rmdir          = nfs_rmdir,
7211         .mknod          = nfs_mknod,
7212         .rename         = nfs_rename,
7213         .permission     = nfs_permission,
7214         .getattr        = nfs_getattr,
7215         .setattr        = nfs_setattr,
7216         .getxattr       = generic_getxattr,
7217         .setxattr       = generic_setxattr,
7218         .listxattr      = generic_listxattr,
7219         .removexattr    = generic_removexattr,
7220 };
7221
7222 static const struct inode_operations nfs4_file_inode_operations = {
7223         .permission     = nfs_permission,
7224         .getattr        = nfs_getattr,
7225         .setattr        = nfs_setattr,
7226         .getxattr       = generic_getxattr,
7227         .setxattr       = generic_setxattr,
7228         .listxattr      = generic_listxattr,
7229         .removexattr    = generic_removexattr,
7230 };
7231
7232 const struct nfs_rpc_ops nfs_v4_clientops = {
7233         .version        = 4,                    /* protocol version */
7234         .dentry_ops     = &nfs4_dentry_operations,
7235         .dir_inode_ops  = &nfs4_dir_inode_operations,
7236         .file_inode_ops = &nfs4_file_inode_operations,
7237         .file_ops       = &nfs4_file_operations,
7238         .getroot        = nfs4_proc_get_root,
7239         .submount       = nfs4_submount,
7240         .try_mount      = nfs4_try_mount,
7241         .getattr        = nfs4_proc_getattr,
7242         .setattr        = nfs4_proc_setattr,
7243         .lookup         = nfs4_proc_lookup,
7244         .access         = nfs4_proc_access,
7245         .readlink       = nfs4_proc_readlink,
7246         .create         = nfs4_proc_create,
7247         .remove         = nfs4_proc_remove,
7248         .unlink_setup   = nfs4_proc_unlink_setup,
7249         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
7250         .unlink_done    = nfs4_proc_unlink_done,
7251         .rename         = nfs4_proc_rename,
7252         .rename_setup   = nfs4_proc_rename_setup,
7253         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
7254         .rename_done    = nfs4_proc_rename_done,
7255         .link           = nfs4_proc_link,
7256         .symlink        = nfs4_proc_symlink,
7257         .mkdir          = nfs4_proc_mkdir,
7258         .rmdir          = nfs4_proc_remove,
7259         .readdir        = nfs4_proc_readdir,
7260         .mknod          = nfs4_proc_mknod,
7261         .statfs         = nfs4_proc_statfs,
7262         .fsinfo         = nfs4_proc_fsinfo,
7263         .pathconf       = nfs4_proc_pathconf,
7264         .set_capabilities = nfs4_server_capabilities,
7265         .decode_dirent  = nfs4_decode_dirent,
7266         .read_setup     = nfs4_proc_read_setup,
7267         .read_pageio_init = pnfs_pageio_init_read,
7268         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
7269         .read_done      = nfs4_read_done,
7270         .write_setup    = nfs4_proc_write_setup,
7271         .write_pageio_init = pnfs_pageio_init_write,
7272         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
7273         .write_done     = nfs4_write_done,
7274         .commit_setup   = nfs4_proc_commit_setup,
7275         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
7276         .commit_done    = nfs4_commit_done,
7277         .lock           = nfs4_proc_lock,
7278         .clear_acl_cache = nfs4_zap_acl_attr,
7279         .close_context  = nfs4_close_context,
7280         .open_context   = nfs4_atomic_open,
7281         .have_delegation = nfs4_have_delegation,
7282         .return_delegation = nfs4_inode_return_delegation,
7283         .alloc_client   = nfs4_alloc_client,
7284         .init_client    = nfs4_init_client,
7285         .free_client    = nfs4_free_client,
7286         .create_server  = nfs4_create_server,
7287         .clone_server   = nfs_clone_server,
7288 };
7289
7290 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
7291         .prefix = XATTR_NAME_NFSV4_ACL,
7292         .list   = nfs4_xattr_list_nfs4_acl,
7293         .get    = nfs4_xattr_get_nfs4_acl,
7294         .set    = nfs4_xattr_set_nfs4_acl,
7295 };
7296
7297 const struct xattr_handler *nfs4_xattr_handlers[] = {
7298         &nfs4_xattr_nfs4_acl_handler,
7299         NULL
7300 };
7301
7302 /*
7303  * Local variables:
7304  *  c-basic-offset: 8
7305  * End:
7306  */