fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.h>
  55 #include <linux/sunrpc/bc_xprt.h>
  56 #include <linux/xattr.h>
  57 #include <linux/utsname.h>
  58 #include <linux/freezer.h>
  59
  60 #include "nfs4_fs.h"
  61 #include "delegation.h"
  62 #include "internal.h"
  63 #include "iostat.h"
  64 #include "callback.h"
  65 #include "pnfs.h"
  66 #include "netns.h"
  67
  68 #define NFSDBG_FACILITY         NFSDBG_PROC
  69
  70 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  71 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  72
  73 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  74
  75 struct nfs4_opendata;
  76 static int _nfs4_proc_open(struct nfs4_opendata *data);
  77 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  78 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  79 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  80 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  81 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
  82 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  83 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  84                             struct nfs_fattr *fattr, struct iattr *sattr,
  85                             struct nfs4_state *state);
  86 #ifdef CONFIG_NFS_V4_1
  87 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  88 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  89 #endif
  90 /* Prevent leaks of NFSv4 errors into userland */
  91 static int nfs4_map_errors(int err)
  92 {
  93         if (err >= -1000)
  94                 return err;
  95         switch (err) {
  96         case -NFS4ERR_RESOURCE:
  97                 return -EREMOTEIO;
  98         case -NFS4ERR_WRONGSEC:
  99                 return -EPERM;
 100         case -NFS4ERR_BADOWNER:
 101         case -NFS4ERR_BADNAME:
 102                 return -EINVAL;
 103         case -NFS4ERR_SHARE_DENIED:
 104                 return -EACCES;
 105         case -NFS4ERR_MINOR_VERS_MISMATCH:
 106                 return -EPROTONOSUPPORT;
 107         case -NFS4ERR_ACCESS:
 108                 return -EACCES;
 109         default:
 110                 dprintk("%s could not handle NFSv4 error %d\n",
 111                                 __func__, -err);
 112                 break;
 113         }
 114         return -EIO;
 115 }
 116
 117 /*
 118  * This is our standard bitmap for GETATTR requests.
 119  */
 120 const u32 nfs4_fattr_bitmap[3] = {
 121         FATTR4_WORD0_TYPE
 122         | FATTR4_WORD0_CHANGE
 123         | FATTR4_WORD0_SIZE
 124         | FATTR4_WORD0_FSID
 125         | FATTR4_WORD0_FILEID,
 126         FATTR4_WORD1_MODE
 127         | FATTR4_WORD1_NUMLINKS
 128         | FATTR4_WORD1_OWNER
 129         | FATTR4_WORD1_OWNER_GROUP
 130         | FATTR4_WORD1_RAWDEV
 131         | FATTR4_WORD1_SPACE_USED
 132         | FATTR4_WORD1_TIME_ACCESS
 133         | FATTR4_WORD1_TIME_METADATA
 134         | FATTR4_WORD1_TIME_MODIFY
 135 };
 136
 137 static const u32 nfs4_pnfs_open_bitmap[3] = {
 138         FATTR4_WORD0_TYPE
 139         | FATTR4_WORD0_CHANGE
 140         | FATTR4_WORD0_SIZE
 141         | FATTR4_WORD0_FSID
 142         | FATTR4_WORD0_FILEID,
 143         FATTR4_WORD1_MODE
 144         | FATTR4_WORD1_NUMLINKS
 145         | FATTR4_WORD1_OWNER
 146         | FATTR4_WORD1_OWNER_GROUP
 147         | FATTR4_WORD1_RAWDEV
 148         | FATTR4_WORD1_SPACE_USED
 149         | FATTR4_WORD1_TIME_ACCESS
 150         | FATTR4_WORD1_TIME_METADATA
 151         | FATTR4_WORD1_TIME_MODIFY,
 152         FATTR4_WORD2_MDSTHRESHOLD
 153 };
 154
 155 static const u32 nfs4_open_noattr_bitmap[3] = {
 156         FATTR4_WORD0_TYPE
 157         | FATTR4_WORD0_CHANGE
 158         | FATTR4_WORD0_FILEID,
 159 };
 160
 161 const u32 nfs4_statfs_bitmap[2] = {
 162         FATTR4_WORD0_FILES_AVAIL
 163         | FATTR4_WORD0_FILES_FREE
 164         | FATTR4_WORD0_FILES_TOTAL,
 165         FATTR4_WORD1_SPACE_AVAIL
 166         | FATTR4_WORD1_SPACE_FREE
 167         | FATTR4_WORD1_SPACE_TOTAL
 168 };
 169
 170 const u32 nfs4_pathconf_bitmap[2] = {
 171         FATTR4_WORD0_MAXLINK
 172         | FATTR4_WORD0_MAXNAME,
 173         0
 174 };
 175
 176 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 177                         | FATTR4_WORD0_MAXREAD
 178                         | FATTR4_WORD0_MAXWRITE
 179                         | FATTR4_WORD0_LEASE_TIME,
 180                         FATTR4_WORD1_TIME_DELTA
 181                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 182                         FATTR4_WORD2_LAYOUT_BLKSIZE
 183 };
 184
 185 const u32 nfs4_fs_locations_bitmap[2] = {
 186         FATTR4_WORD0_TYPE
 187         | FATTR4_WORD0_CHANGE
 188         | FATTR4_WORD0_SIZE
 189         | FATTR4_WORD0_FSID
 190         | FATTR4_WORD0_FILEID
 191         | FATTR4_WORD0_FS_LOCATIONS,
 192         FATTR4_WORD1_MODE
 193         | FATTR4_WORD1_NUMLINKS
 194         | FATTR4_WORD1_OWNER
 195         | FATTR4_WORD1_OWNER_GROUP
 196         | FATTR4_WORD1_RAWDEV
 197         | FATTR4_WORD1_SPACE_USED
 198         | FATTR4_WORD1_TIME_ACCESS
 199         | FATTR4_WORD1_TIME_METADATA
 200         | FATTR4_WORD1_TIME_MODIFY
 201         | FATTR4_WORD1_MOUNTED_ON_FILEID
 202 };
 203
 204 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 205                 struct nfs4_readdir_arg *readdir)
 206 {
 207         __be32 *start, *p;
 208
 209         if (cookie > 2) {
 210                 readdir->cookie = cookie;
 211                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 212                 return;
 213         }
 214
 215         readdir->cookie = 0;
 216         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 217         if (cookie == 2)
 218                 return;
 219
 220         /*
 221          * NFSv4 servers do not return entries for '.' and '..'
 222          * Therefore, we fake these entries here.  We let '.'
 223          * have cookie 0 and '..' have cookie 1.  Note that
 224          * when talking to the server, we always send cookie 0
 225          * instead of 1 or 2.
 226          */
 227         start = p = kmap_atomic(*readdir->pages);
 228
 229         if (cookie == 0) {
 230                 *p++ = xdr_one;                                  /* next */
 231                 *p++ = xdr_zero;                   /* cookie, first word */
 232                 *p++ = xdr_one;                   /* cookie, second word */
 233                 *p++ = xdr_one;                             /* entry len */
 234                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 235                 p++;
 236                 *p++ = xdr_one;                         /* bitmap length */
 237                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 238                 *p++ = htonl(8);              /* attribute buffer length */
 239                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 240         }
 241
 242         *p++ = xdr_one;                                  /* next */
 243         *p++ = xdr_zero;                   /* cookie, first word */
 244         *p++ = xdr_two;                   /* cookie, second word */
 245         *p++ = xdr_two;                             /* entry len */
 246         memcpy(p, "..\0\0", 4);                         /* entry */
 247         p++;
 248         *p++ = xdr_one;                         /* bitmap length */
 249         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 250         *p++ = htonl(8);              /* attribute buffer length */
 251         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 252
 253         readdir->pgbase = (char *)p - (char *)start;
 254         readdir->count -= readdir->pgbase;
 255         kunmap_atomic(start);
 256 }
 257
 258 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 259 {
 260         int res;
 261
 262         might_sleep();
 263
 264         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 265                         nfs_wait_bit_killable, TASK_KILLABLE);
 266         if (res)
 267                 return res;
 268
 269         if (clp->cl_cons_state < 0)
 270                 return clp->cl_cons_state;
 271         return 0;
 272 }
 273
 274 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 275 {
 276         int res = 0;
 277
 278         might_sleep();
 279
 280         if (*timeout <= 0)
 281                 *timeout = NFS4_POLL_RETRY_MIN;
 282         if (*timeout > NFS4_POLL_RETRY_MAX)
 283                 *timeout = NFS4_POLL_RETRY_MAX;
 284         freezable_schedule_timeout_killable(*timeout);
 285         if (fatal_signal_pending(current))
 286                 res = -ERESTARTSYS;
 287         *timeout <<= 1;
 288         return res;
 289 }
 290
 291 /* This is the error handling routine for processes that are allowed
 292  * to sleep.
 293  */
 294 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 295 {
 296         struct nfs_client *clp = server->nfs_client;
 297         struct nfs4_state *state = exception->state;
 298         struct inode *inode = exception->inode;
 299         int ret = errorcode;
 300
 301         exception->retry = 0;
 302         switch(errorcode) {
 303                 case 0:
 304                         return 0;
 305                 case -NFS4ERR_OPENMODE:
 306                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 307                                 nfs4_inode_return_delegation(inode);
 308                                 exception->retry = 1;
 309                                 return 0;
 310                         }
 311                         if (state == NULL)
 312                                 break;
 313                         nfs4_schedule_stateid_recovery(server, state);
 314                         goto wait_on_recovery;
 315                 case -NFS4ERR_DELEG_REVOKED:
 316                 case -NFS4ERR_ADMIN_REVOKED:
 317                 case -NFS4ERR_BAD_STATEID:
 318                         if (state == NULL)
 319                                 break;
 320                         nfs_remove_bad_delegation(state->inode);
 321                         nfs4_schedule_stateid_recovery(server, state);
 322                         goto wait_on_recovery;
 323                 case -NFS4ERR_EXPIRED:
 324                         if (state != NULL)
 325                                 nfs4_schedule_stateid_recovery(server, state);
 326                 case -NFS4ERR_STALE_STATEID:
 327                 case -NFS4ERR_STALE_CLIENTID:
 328                         nfs4_schedule_lease_recovery(clp);
 329                         goto wait_on_recovery;
 330 #if defined(CONFIG_NFS_V4_1)
 331                 case -NFS4ERR_BADSESSION:
 332                 case -NFS4ERR_BADSLOT:
 333                 case -NFS4ERR_BAD_HIGH_SLOT:
 334                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 335                 case -NFS4ERR_DEADSESSION:
 336                 case -NFS4ERR_SEQ_FALSE_RETRY:
 337                 case -NFS4ERR_SEQ_MISORDERED:
 338                         dprintk("%s ERROR: %d Reset session\n", __func__,
 339                                 errorcode);
 340                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 341                         goto wait_on_recovery;
 342 #endif /* defined(CONFIG_NFS_V4_1) */
 343                 case -NFS4ERR_FILE_OPEN:
 344                         if (exception->timeout > HZ) {
 345                                 /* We have retried a decent amount, time to
 346                                  * fail
 347                                  */
 348                                 ret = -EBUSY;
 349                                 break;
 350                         }
 351                 case -NFS4ERR_GRACE:
 352                 case -NFS4ERR_DELAY:
 353                 case -EKEYEXPIRED:
 354                         ret = nfs4_delay(server->client, &exception->timeout);
 355                         if (ret != 0)
 356                                 break;
 357                 case -NFS4ERR_RETRY_UNCACHED_REP:
 358                 case -NFS4ERR_OLD_STATEID:
 359                         exception->retry = 1;
 360                         break;
 361                 case -NFS4ERR_BADOWNER:
 362                         /* The following works around a Linux server bug! */
 363                 case -NFS4ERR_BADNAME:
 364                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 365                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 366                                 exception->retry = 1;
 367                                 printk(KERN_WARNING "NFS: v4 server %s "
 368                                                 "does not accept raw "
 369                                                 "uid/gids. "
 370                                                 "Reenabling the idmapper.\n",
 371                                                 server->nfs_client->cl_hostname);
 372                         }
 373         }
 374         /* We failed to handle the error */
 375         return nfs4_map_errors(ret);
 376 wait_on_recovery:
 377         ret = nfs4_wait_clnt_recover(clp);
 378         if (ret == 0)
 379                 exception->retry = 1;
 380         return ret;
 381 }
 382
 383
 384 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 385 {
 386         spin_lock(&clp->cl_lock);
 387         if (time_before(clp->cl_last_renewal,timestamp))
 388                 clp->cl_last_renewal = timestamp;
 389         spin_unlock(&clp->cl_lock);
 390 }
 391
 392 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 393 {
 394         do_renew_lease(server->nfs_client, timestamp);
 395 }
 396
 397 #if defined(CONFIG_NFS_V4_1)
 398
 399 /*
 400  * nfs4_free_slot - free a slot and efficiently update slot table.
 401  *
 402  * freeing a slot is trivially done by clearing its respective bit
 403  * in the bitmap.
 404  * If the freed slotid equals highest_used_slotid we want to update it
 405  * so that the server would be able to size down the slot table if needed,
 406  * otherwise we know that the highest_used_slotid is still in use.
 407  * When updating highest_used_slotid there may be "holes" in the bitmap
 408  * so we need to scan down from highest_used_slotid to 0 looking for the now
 409  * highest slotid in use.
 410  * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
 411  *
 412  * Must be called while holding tbl->slot_tbl_lock
 413  */
 414 static void
 415 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot)
 416 {
 417         u32 slotid = slot->slot_nr;
 418
 419         /* clear used bit in bitmap */
 420         __clear_bit(slotid, tbl->used_slots);
 421
 422         /* update highest_used_slotid when it is freed */
 423         if (slotid == tbl->highest_used_slotid) {
 424                 u32 new_max = find_last_bit(tbl->used_slots, slotid);
 425                 if (new_max < slotid)
 426                         tbl->highest_used_slotid = new_max;
 427                 else
 428                         tbl->highest_used_slotid = NFS4_NO_SLOT;
 429         }
 430         dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
 431                 slotid, tbl->highest_used_slotid);
 432 }
 433
 434 bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
 435 {
 436         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 437         return true;
 438 }
 439
 440 /*
 441  * Signal state manager thread if session fore channel is drained
 442  */
 443 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 444 {
 445         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 446                 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
 447                                 nfs4_set_task_privileged, NULL);
 448                 return;
 449         }
 450
 451         if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 452                 return;
 453
 454         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 455         complete(&ses->fc_slot_table.complete);
 456 }
 457
 458 /*
 459  * Signal state manager thread if session back channel is drained
 460  */
 461 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 462 {
 463         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 464             ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 465                 return;
 466         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 467         complete(&ses->bc_slot_table.complete);
 468 }
 469
 470 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 471 {
 472         struct nfs4_session *session;
 473         struct nfs4_slot_table *tbl;
 474
 475         if (!res->sr_slot) {
 476                 /* just wake up the next guy waiting since
 477                  * we may have not consumed a slot after all */
 478                 dprintk("%s: No slot\n", __func__);
 479                 return;
 480         }
 481         tbl = res->sr_slot->table;
 482         session = tbl->session;
 483
 484         spin_lock(&tbl->slot_tbl_lock);
 485         nfs4_free_slot(tbl, res->sr_slot);
 486         nfs4_check_drain_fc_complete(session);
 487         spin_unlock(&tbl->slot_tbl_lock);
 488         res->sr_slot = NULL;
 489 }
 490
 491 /* Update the client's idea of target_highest_slotid */
 492 static void nfs41_set_target_slotid_locked(struct nfs4_slot_table *tbl,
 493                 u32 target_highest_slotid)
 494 {
 495         unsigned int max_slotid, i;
 496
 497         if (tbl->target_highest_slotid == target_highest_slotid)
 498                 return;
 499         tbl->target_highest_slotid = target_highest_slotid;
 500         tbl->generation++;
 501
 502         max_slotid = min(tbl->max_slots - 1, tbl->target_highest_slotid);
 503         for (i = tbl->max_slotid + 1; i <= max_slotid; i++)
 504                 rpc_wake_up_next(&tbl->slot_tbl_waitq);
 505         tbl->max_slotid = max_slotid;
 506 }
 507
 508 void nfs41_set_target_slotid(struct nfs4_slot_table *tbl,
 509                 u32 target_highest_slotid)
 510 {
 511         spin_lock(&tbl->slot_tbl_lock);
 512         nfs41_set_target_slotid_locked(tbl, target_highest_slotid);
 513         spin_unlock(&tbl->slot_tbl_lock);
 514 }
 515
 516 static void nfs41_set_server_slotid_locked(struct nfs4_slot_table *tbl,
 517                 u32 highest_slotid)
 518 {
 519         unsigned int max_slotid, i;
 520
 521         if (tbl->server_highest_slotid == highest_slotid)
 522                 return;
 523         if (tbl->highest_used_slotid > highest_slotid)
 524                 return;
 525         max_slotid = min(tbl->max_slots - 1, highest_slotid);
 526         /* Reset the seq_nr for deallocated slots */
 527         for (i = tbl->server_highest_slotid + 1; i <= max_slotid; i++)
 528                 tbl->slots[i].seq_nr = 1;
 529         tbl->server_highest_slotid = highest_slotid;
 530 }
 531
 532 static void nfs41_update_target_slotid(struct nfs4_slot_table *tbl,
 533                 struct nfs4_slot *slot,
 534                 struct nfs4_sequence_res *res)
 535 {
 536         spin_lock(&tbl->slot_tbl_lock);
 537         if (tbl->generation != slot->generation)
 538                 goto out;
 539         nfs41_set_server_slotid_locked(tbl, res->sr_highest_slotid);
 540         nfs41_set_target_slotid_locked(tbl, res->sr_target_highest_slotid);
 541 out:
 542         spin_unlock(&tbl->slot_tbl_lock);
 543 }
 544
 545 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 546 {
 547         struct nfs4_session *session;
 548         struct nfs4_slot *slot;
 549         unsigned long timestamp;
 550         struct nfs_client *clp;
 551
 552         /*
 553          * sr_status remains 1 if an RPC level error occurred. The server
 554          * may or may not have processed the sequence operation..
 555          * Proceed as if the server received and processed the sequence
 556          * operation.
 557          */
 558         if (res->sr_status == 1)
 559                 res->sr_status = NFS_OK;
 560
 561         /* don't increment the sequence number if the task wasn't sent */
 562         if (!RPC_WAS_SENT(task))
 563                 goto out;
 564
 565         slot = res->sr_slot;
 566         session = slot->table->session;
 567
 568         /* Check the SEQUENCE operation status */
 569         switch (res->sr_status) {
 570         case 0:
 571                 /* Update the slot's sequence and clientid lease timer */
 572                 ++slot->seq_nr;
 573                 timestamp = slot->renewal_time;
 574                 clp = session->clp;
 575                 do_renew_lease(clp, timestamp);
 576                 /* Check sequence flags */
 577                 if (res->sr_status_flags != 0)
 578                         nfs4_schedule_lease_recovery(clp);
 579                 nfs41_update_target_slotid(slot->table, slot, res);
 580                 break;
 581         case -NFS4ERR_DELAY:
 582                 /* The server detected a resend of the RPC call and
 583                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 584                  * of RFC5661.
 585                  */
 586                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 587                         __func__,
 588                         slot->slot_nr,
 589                         slot->seq_nr);
 590                 goto out_retry;
 591         default:
 592                 /* Just update the slot sequence no. */
 593                 ++slot->seq_nr;
 594         }
 595 out:
 596         /* The session may be reset by one of the error handlers. */
 597         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 598         nfs41_sequence_free_slot(res);
 599         return 1;
 600 out_retry:
 601         if (!rpc_restart_call(task))
 602                 goto out;
 603         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 604         return 0;
 605 }
 606
 607 static int nfs4_sequence_done(struct rpc_task *task,
 608                                struct nfs4_sequence_res *res)
 609 {
 610         if (res->sr_slot == NULL)
 611                 return 1;
 612         return nfs41_sequence_done(task, res);
 613 }
 614
 615 /*
 616  * nfs4_alloc_slot - efficiently look for a free slot
 617  *
 618  * nfs4_alloc_slot looks for an unset bit in the used_slots bitmap.
 619  * If found, we mark the slot as used, update the highest_used_slotid,
 620  * and respectively set up the sequence operation args.
 621  *
 622  * Note: must be called with under the slot_tbl_lock.
 623  */
 624 static struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl)
 625 {
 626         struct nfs4_slot *ret = NULL;
 627         u32 slotid;
 628
 629         dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
 630                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 631                 tbl->max_slots);
 632         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slotid + 1);
 633         if (slotid > tbl->max_slotid)
 634                 goto out;
 635         __set_bit(slotid, tbl->used_slots);
 636         if (slotid > tbl->highest_used_slotid ||
 637                         tbl->highest_used_slotid == NFS4_NO_SLOT)
 638                 tbl->highest_used_slotid = slotid;
 639         ret = &tbl->slots[slotid];
 640         ret->renewal_time = jiffies;
 641         ret->generation = tbl->generation;
 642
 643 out:
 644         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 645                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 646                 ret ? ret->slot_nr : -1);
 647         return ret;
 648 }
 649
 650 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 651                 struct nfs4_sequence_res *res, int cache_reply)
 652 {
 653         args->sa_slot = NULL;
 654         args->sa_cache_this = 0;
 655         if (cache_reply)
 656                 args->sa_cache_this = 1;
 657         res->sr_slot = NULL;
 658 }
 659
 660 int nfs41_setup_sequence(struct nfs4_session *session,
 661                                 struct nfs4_sequence_args *args,
 662                                 struct nfs4_sequence_res *res,
 663                                 struct rpc_task *task)
 664 {
 665         struct nfs4_slot *slot;
 666         struct nfs4_slot_table *tbl;
 667
 668         dprintk("--> %s\n", __func__);
 669         /* slot already allocated? */
 670         if (res->sr_slot != NULL)
 671                 return 0;
 672
 673         tbl = &session->fc_slot_table;
 674
 675         spin_lock(&tbl->slot_tbl_lock);
 676         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 677             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 678                 /* The state manager will wait until the slot table is empty */
 679                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 680                 spin_unlock(&tbl->slot_tbl_lock);
 681                 dprintk("%s session is draining\n", __func__);
 682                 return -EAGAIN;
 683         }
 684
 685         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 686             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 687                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 688                 spin_unlock(&tbl->slot_tbl_lock);
 689                 dprintk("%s enforce FIFO order\n", __func__);
 690                 return -EAGAIN;
 691         }
 692
 693         slot = nfs4_alloc_slot(tbl);
 694         if (slot == NULL) {
 695                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 696                 spin_unlock(&tbl->slot_tbl_lock);
 697                 dprintk("<-- %s: no free slots\n", __func__);
 698                 return -EAGAIN;
 699         }
 700         spin_unlock(&tbl->slot_tbl_lock);
 701
 702         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 703
 704         args->sa_slot = slot;
 705
 706         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 707                         slot->slot_nr, slot->seq_nr);
 708
 709         res->sr_slot = slot;
 710         res->sr_status_flags = 0;
 711         /*
 712          * sr_status is only set in decode_sequence, and so will remain
 713          * set to 1 if an rpc level failure occurs.
 714          */
 715         res->sr_status = 1;
 716         return 0;
 717 }
 718 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 719
 720 int nfs4_setup_sequence(const struct nfs_server *server,
 721                         struct nfs4_sequence_args *args,
 722                         struct nfs4_sequence_res *res,
 723                         struct rpc_task *task)
 724 {
 725         struct nfs4_session *session = nfs4_get_session(server);
 726         int ret = 0;
 727
 728         if (session == NULL)
 729                 goto out;
 730
 731         dprintk("--> %s clp %p session %p sr_slot %d\n",
 732                 __func__, session->clp, session, res->sr_slot ?
 733                         res->sr_slot->slot_nr : -1);
 734
 735         ret = nfs41_setup_sequence(session, args, res, task);
 736 out:
 737         dprintk("<-- %s status=%d\n", __func__, ret);
 738         return ret;
 739 }
 740
 741 struct nfs41_call_sync_data {
 742         const struct nfs_server *seq_server;
 743         struct nfs4_sequence_args *seq_args;
 744         struct nfs4_sequence_res *seq_res;
 745 };
 746
 747 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 748 {
 749         struct nfs41_call_sync_data *data = calldata;
 750
 751         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 752
 753         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 754                                 data->seq_res, task))
 755                 return;
 756         rpc_call_start(task);
 757 }
 758
 759 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 760 {
 761         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 762         nfs41_call_sync_prepare(task, calldata);
 763 }
 764
 765 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 766 {
 767         struct nfs41_call_sync_data *data = calldata;
 768
 769         nfs41_sequence_done(task, data->seq_res);
 770 }
 771
 772 static const struct rpc_call_ops nfs41_call_sync_ops = {
 773         .rpc_call_prepare = nfs41_call_sync_prepare,
 774         .rpc_call_done = nfs41_call_sync_done,
 775 };
 776
 777 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 778         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 779         .rpc_call_done = nfs41_call_sync_done,
 780 };
 781
 782 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 783                                    struct nfs_server *server,
 784                                    struct rpc_message *msg,
 785                                    struct nfs4_sequence_args *args,
 786                                    struct nfs4_sequence_res *res,
 787                                    int privileged)
 788 {
 789         int ret;
 790         struct rpc_task *task;
 791         struct nfs41_call_sync_data data = {
 792                 .seq_server = server,
 793                 .seq_args = args,
 794                 .seq_res = res,
 795         };
 796         struct rpc_task_setup task_setup = {
 797                 .rpc_client = clnt,
 798                 .rpc_message = msg,
 799                 .callback_ops = &nfs41_call_sync_ops,
 800                 .callback_data = &data
 801         };
 802
 803         if (privileged)
 804                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 805         task = rpc_run_task(&task_setup);
 806         if (IS_ERR(task))
 807                 ret = PTR_ERR(task);
 808         else {
 809                 ret = task->tk_status;
 810                 rpc_put_task(task);
 811         }
 812         return ret;
 813 }
 814
 815 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 816                             struct nfs_server *server,
 817                             struct rpc_message *msg,
 818                             struct nfs4_sequence_args *args,
 819                             struct nfs4_sequence_res *res,
 820                             int cache_reply)
 821 {
 822         nfs41_init_sequence(args, res, cache_reply);
 823         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 824 }
 825
 826 #else
 827 static inline
 828 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 829                 struct nfs4_sequence_res *res, int cache_reply)
 830 {
 831 }
 832
 833 static int nfs4_sequence_done(struct rpc_task *task,
 834                                struct nfs4_sequence_res *res)
 835 {
 836         return 1;
 837 }
 838 #endif /* CONFIG_NFS_V4_1 */
 839
 840 int _nfs4_call_sync(struct rpc_clnt *clnt,
 841                     struct nfs_server *server,
 842                     struct rpc_message *msg,
 843                     struct nfs4_sequence_args *args,
 844                     struct nfs4_sequence_res *res,
 845                     int cache_reply)
 846 {
 847         nfs41_init_sequence(args, res, cache_reply);
 848         return rpc_call_sync(clnt, msg, 0);
 849 }
 850
 851 static inline
 852 int nfs4_call_sync(struct rpc_clnt *clnt,
 853                    struct nfs_server *server,
 854                    struct rpc_message *msg,
 855                    struct nfs4_sequence_args *args,
 856                    struct nfs4_sequence_res *res,
 857                    int cache_reply)
 858 {
 859         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 860                                                 args, res, cache_reply);
 861 }
 862
 863 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 864 {
 865         struct nfs_inode *nfsi = NFS_I(dir);
 866
 867         spin_lock(&dir->i_lock);
 868         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 869         if (!cinfo->atomic || cinfo->before != dir->i_version)
 870                 nfs_force_lookup_revalidate(dir);
 871         dir->i_version = cinfo->after;
 872         spin_unlock(&dir->i_lock);
 873 }
 874
 875 struct nfs4_opendata {
 876         struct kref kref;
 877         struct nfs_openargs o_arg;
 878         struct nfs_openres o_res;
 879         struct nfs_open_confirmargs c_arg;
 880         struct nfs_open_confirmres c_res;
 881         struct nfs4_string owner_name;
 882         struct nfs4_string group_name;
 883         struct nfs_fattr f_attr;
 884         struct dentry *dir;
 885         struct dentry *dentry;
 886         struct nfs4_state_owner *owner;
 887         struct nfs4_state *state;
 888         struct iattr attrs;
 889         unsigned long timestamp;
 890         unsigned int rpc_done : 1;
 891         int rpc_status;
 892         int cancelled;
 893 };
 894
 895
 896 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 897 {
 898         p->o_res.f_attr = &p->f_attr;
 899         p->o_res.seqid = p->o_arg.seqid;
 900         p->c_res.seqid = p->c_arg.seqid;
 901         p->o_res.server = p->o_arg.server;
 902         p->o_res.access_request = p->o_arg.access;
 903         nfs_fattr_init(&p->f_attr);
 904         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 905 }
 906
 907 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 908                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 909                 const struct iattr *attrs,
 910                 gfp_t gfp_mask)
 911 {
 912         struct dentry *parent = dget_parent(dentry);
 913         struct inode *dir = parent->d_inode;
 914         struct nfs_server *server = NFS_SERVER(dir);
 915         struct nfs4_opendata *p;
 916
 917         p = kzalloc(sizeof(*p), gfp_mask);
 918         if (p == NULL)
 919                 goto err;
 920         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 921         if (p->o_arg.seqid == NULL)
 922                 goto err_free;
 923         nfs_sb_active(dentry->d_sb);
 924         p->dentry = dget(dentry);
 925         p->dir = parent;
 926         p->owner = sp;
 927         atomic_inc(&sp->so_count);
 928         p->o_arg.fh = NFS_FH(dir);
 929         p->o_arg.open_flags = flags;
 930         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 931         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 932          * will return permission denied for all bits until close */
 933         if (!(flags & O_EXCL)) {
 934                 /* ask server to check for all possible rights as results
 935                  * are cached */
 936                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 937                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 938         }
 939         p->o_arg.clientid = server->nfs_client->cl_clientid;
 940         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 941         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 942         p->o_arg.name = &dentry->d_name;
 943         p->o_arg.server = server;
 944         p->o_arg.bitmask = server->attr_bitmask;
 945         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 946         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 947         if (attrs != NULL && attrs->ia_valid != 0) {
 948                 __be32 verf[2];
 949
 950                 p->o_arg.u.attrs = &p->attrs;
 951                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 952
 953                 verf[0] = jiffies;
 954                 verf[1] = current->pid;
 955                 memcpy(p->o_arg.u.verifier.data, verf,
 956                                 sizeof(p->o_arg.u.verifier.data));
 957         }
 958         p->c_arg.fh = &p->o_res.fh;
 959         p->c_arg.stateid = &p->o_res.stateid;
 960         p->c_arg.seqid = p->o_arg.seqid;
 961         nfs4_init_opendata_res(p);
 962         kref_init(&p->kref);
 963         return p;
 964 err_free:
 965         kfree(p);
 966 err:
 967         dput(parent);
 968         return NULL;
 969 }
 970
 971 static void nfs4_opendata_free(struct kref *kref)
 972 {
 973         struct nfs4_opendata *p = container_of(kref,
 974                         struct nfs4_opendata, kref);
 975         struct super_block *sb = p->dentry->d_sb;
 976
 977         nfs_free_seqid(p->o_arg.seqid);
 978         if (p->state != NULL)
 979                 nfs4_put_open_state(p->state);
 980         nfs4_put_state_owner(p->owner);
 981         dput(p->dir);
 982         dput(p->dentry);
 983         nfs_sb_deactive(sb);
 984         nfs_fattr_free_names(&p->f_attr);
 985         kfree(p);
 986 }
 987
 988 static void nfs4_opendata_put(struct nfs4_opendata *p)
 989 {
 990         if (p != NULL)
 991                 kref_put(&p->kref, nfs4_opendata_free);
 992 }
 993
 994 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 995 {
 996         int ret;
 997
 998         ret = rpc_wait_for_completion_task(task);
 999         return ret;
1000 }
1001
1002 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1003 {
1004         int ret = 0;
1005
1006         if (open_mode & (O_EXCL|O_TRUNC))
1007                 goto out;
1008         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1009                 case FMODE_READ:
1010                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1011                                 && state->n_rdonly != 0;
1012                         break;
1013                 case FMODE_WRITE:
1014                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1015                                 && state->n_wronly != 0;
1016                         break;
1017                 case FMODE_READ|FMODE_WRITE:
1018                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1019                                 && state->n_rdwr != 0;
1020         }
1021 out:
1022         return ret;
1023 }
1024
1025 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1026 {
1027         if (delegation == NULL)
1028                 return 0;
1029         if ((delegation->type & fmode) != fmode)
1030                 return 0;
1031         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1032                 return 0;
1033         nfs_mark_delegation_referenced(delegation);
1034         return 1;
1035 }
1036
1037 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1038 {
1039         switch (fmode) {
1040                 case FMODE_WRITE:
1041                         state->n_wronly++;
1042                         break;
1043                 case FMODE_READ:
1044                         state->n_rdonly++;
1045                         break;
1046                 case FMODE_READ|FMODE_WRITE:
1047                         state->n_rdwr++;
1048         }
1049         nfs4_state_set_mode_locked(state, state->state | fmode);
1050 }
1051
1052 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1053 {
1054         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1055                 nfs4_stateid_copy(&state->stateid, stateid);
1056         nfs4_stateid_copy(&state->open_stateid, stateid);
1057         switch (fmode) {
1058                 case FMODE_READ:
1059                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1060                         break;
1061                 case FMODE_WRITE:
1062                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1063                         break;
1064                 case FMODE_READ|FMODE_WRITE:
1065                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1066         }
1067 }
1068
1069 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1070 {
1071         write_seqlock(&state->seqlock);
1072         nfs_set_open_stateid_locked(state, stateid, fmode);
1073         write_sequnlock(&state->seqlock);
1074 }
1075
1076 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1077 {
1078         /*
1079          * Protect the call to nfs4_state_set_mode_locked and
1080          * serialise the stateid update
1081          */
1082         write_seqlock(&state->seqlock);
1083         if (deleg_stateid != NULL) {
1084                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1085                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1086         }
1087         if (open_stateid != NULL)
1088                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1089         write_sequnlock(&state->seqlock);
1090         spin_lock(&state->owner->so_lock);
1091         update_open_stateflags(state, fmode);
1092         spin_unlock(&state->owner->so_lock);
1093 }
1094
1095 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1096 {
1097         struct nfs_inode *nfsi = NFS_I(state->inode);
1098         struct nfs_delegation *deleg_cur;
1099         int ret = 0;
1100
1101         fmode &= (FMODE_READ|FMODE_WRITE);
1102
1103         rcu_read_lock();
1104         deleg_cur = rcu_dereference(nfsi->delegation);
1105         if (deleg_cur == NULL)
1106                 goto no_delegation;
1107
1108         spin_lock(&deleg_cur->lock);
1109         if (nfsi->delegation != deleg_cur ||
1110             (deleg_cur->type & fmode) != fmode)
1111                 goto no_delegation_unlock;
1112
1113         if (delegation == NULL)
1114                 delegation = &deleg_cur->stateid;
1115         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1116                 goto no_delegation_unlock;
1117
1118         nfs_mark_delegation_referenced(deleg_cur);
1119         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1120         ret = 1;
1121 no_delegation_unlock:
1122         spin_unlock(&deleg_cur->lock);
1123 no_delegation:
1124         rcu_read_unlock();
1125
1126         if (!ret && open_stateid != NULL) {
1127                 __update_open_stateid(state, open_stateid, NULL, fmode);
1128                 ret = 1;
1129         }
1130
1131         return ret;
1132 }
1133
1134
1135 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1136 {
1137         struct nfs_delegation *delegation;
1138
1139         rcu_read_lock();
1140         delegation = rcu_dereference(NFS_I(inode)->delegation);
1141         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1142                 rcu_read_unlock();
1143                 return;
1144         }
1145         rcu_read_unlock();
1146         nfs4_inode_return_delegation(inode);
1147 }
1148
1149 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1150 {
1151         struct nfs4_state *state = opendata->state;
1152         struct nfs_inode *nfsi = NFS_I(state->inode);
1153         struct nfs_delegation *delegation;
1154         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1155         fmode_t fmode = opendata->o_arg.fmode;
1156         nfs4_stateid stateid;
1157         int ret = -EAGAIN;
1158
1159         for (;;) {
1160                 if (can_open_cached(state, fmode, open_mode)) {
1161                         spin_lock(&state->owner->so_lock);
1162                         if (can_open_cached(state, fmode, open_mode)) {
1163                                 update_open_stateflags(state, fmode);
1164                                 spin_unlock(&state->owner->so_lock);
1165                                 goto out_return_state;
1166                         }
1167                         spin_unlock(&state->owner->so_lock);
1168                 }
1169                 rcu_read_lock();
1170                 delegation = rcu_dereference(nfsi->delegation);
1171                 if (!can_open_delegated(delegation, fmode)) {
1172                         rcu_read_unlock();
1173                         break;
1174                 }
1175                 /* Save the delegation */
1176                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1177                 rcu_read_unlock();
1178                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1179                 if (ret != 0)
1180                         goto out;
1181                 ret = -EAGAIN;
1182
1183                 /* Try to update the stateid using the delegation */
1184                 if (update_open_stateid(state, NULL, &stateid, fmode))
1185                         goto out_return_state;
1186         }
1187 out:
1188         return ERR_PTR(ret);
1189 out_return_state:
1190         atomic_inc(&state->count);
1191         return state;
1192 }
1193
1194 static void
1195 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1196 {
1197         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1198         struct nfs_delegation *delegation;
1199         int delegation_flags = 0;
1200
1201         rcu_read_lock();
1202         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1203         if (delegation)
1204                 delegation_flags = delegation->flags;
1205         rcu_read_unlock();
1206         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1207                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1208                                    "returning a delegation for "
1209                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1210                                    clp->cl_hostname);
1211         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1212                 nfs_inode_set_delegation(state->inode,
1213                                          data->owner->so_cred,
1214                                          &data->o_res);
1215         else
1216                 nfs_inode_reclaim_delegation(state->inode,
1217                                              data->owner->so_cred,
1218                                              &data->o_res);
1219 }
1220
1221 /*
1222  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1223  * and update the nfs4_state.
1224  */
1225 static struct nfs4_state *
1226 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1227 {
1228         struct inode *inode = data->state->inode;
1229         struct nfs4_state *state = data->state;
1230         int ret;
1231
1232         if (!data->rpc_done) {
1233                 ret = data->rpc_status;
1234                 goto err;
1235         }
1236
1237         ret = -ESTALE;
1238         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1239             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1240             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1241                 goto err;
1242
1243         ret = -ENOMEM;
1244         state = nfs4_get_open_state(inode, data->owner);
1245         if (state == NULL)
1246                 goto err;
1247
1248         ret = nfs_refresh_inode(inode, &data->f_attr);
1249         if (ret)
1250                 goto err;
1251
1252         if (data->o_res.delegation_type != 0)
1253                 nfs4_opendata_check_deleg(data, state);
1254         update_open_stateid(state, &data->o_res.stateid, NULL,
1255                             data->o_arg.fmode);
1256
1257         return state;
1258 err:
1259         return ERR_PTR(ret);
1260
1261 }
1262
1263 static struct nfs4_state *
1264 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1265 {
1266         struct inode *inode;
1267         struct nfs4_state *state = NULL;
1268         int ret;
1269
1270         if (!data->rpc_done) {
1271                 state = nfs4_try_open_cached(data);
1272                 goto out;
1273         }
1274
1275         ret = -EAGAIN;
1276         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1277                 goto err;
1278         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1279         ret = PTR_ERR(inode);
1280         if (IS_ERR(inode))
1281                 goto err;
1282         ret = -ENOMEM;
1283         state = nfs4_get_open_state(inode, data->owner);
1284         if (state == NULL)
1285                 goto err_put_inode;
1286         if (data->o_res.delegation_type != 0)
1287                 nfs4_opendata_check_deleg(data, state);
1288         update_open_stateid(state, &data->o_res.stateid, NULL,
1289                         data->o_arg.fmode);
1290         iput(inode);
1291 out:
1292         return state;
1293 err_put_inode:
1294         iput(inode);
1295 err:
1296         return ERR_PTR(ret);
1297 }
1298
1299 static struct nfs4_state *
1300 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1301 {
1302         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1303                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1304         return _nfs4_opendata_to_nfs4_state(data);
1305 }
1306
1307 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1308 {
1309         struct nfs_inode *nfsi = NFS_I(state->inode);
1310         struct nfs_open_context *ctx;
1311
1312         spin_lock(&state->inode->i_lock);
1313         list_for_each_entry(ctx, &nfsi->open_files, list) {
1314                 if (ctx->state != state)
1315                         continue;
1316                 get_nfs_open_context(ctx);
1317                 spin_unlock(&state->inode->i_lock);
1318                 return ctx;
1319         }
1320         spin_unlock(&state->inode->i_lock);
1321         return ERR_PTR(-ENOENT);
1322 }
1323
1324 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1325 {
1326         struct nfs4_opendata *opendata;
1327
1328         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1329         if (opendata == NULL)
1330                 return ERR_PTR(-ENOMEM);
1331         opendata->state = state;
1332         atomic_inc(&state->count);
1333         return opendata;
1334 }
1335
1336 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1337 {
1338         struct nfs4_state *newstate;
1339         int ret;
1340
1341         opendata->o_arg.open_flags = 0;
1342         opendata->o_arg.fmode = fmode;
1343         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1344         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1345         nfs4_init_opendata_res(opendata);
1346         ret = _nfs4_recover_proc_open(opendata);
1347         if (ret != 0)
1348                 return ret;
1349         newstate = nfs4_opendata_to_nfs4_state(opendata);
1350         if (IS_ERR(newstate))
1351                 return PTR_ERR(newstate);
1352         nfs4_close_state(newstate, fmode);
1353         *res = newstate;
1354         return 0;
1355 }
1356
1357 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1358 {
1359         struct nfs4_state *newstate;
1360         int ret;
1361
1362         /* memory barrier prior to reading state->n_* */
1363         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1364         smp_rmb();
1365         if (state->n_rdwr != 0) {
1366                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1367                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1368                 if (ret != 0)
1369                         return ret;
1370                 if (newstate != state)
1371                         return -ESTALE;
1372         }
1373         if (state->n_wronly != 0) {
1374                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1375                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1376                 if (ret != 0)
1377                         return ret;
1378                 if (newstate != state)
1379                         return -ESTALE;
1380         }
1381         if (state->n_rdonly != 0) {
1382                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1383                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1384                 if (ret != 0)
1385                         return ret;
1386                 if (newstate != state)
1387                         return -ESTALE;
1388         }
1389         /*
1390          * We may have performed cached opens for all three recoveries.
1391          * Check if we need to update the current stateid.
1392          */
1393         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1394             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1395                 write_seqlock(&state->seqlock);
1396                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1397                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1398                 write_sequnlock(&state->seqlock);
1399         }
1400         return 0;
1401 }
1402
1403 /*
1404  * OPEN_RECLAIM:
1405  *      reclaim state on the server after a reboot.
1406  */
1407 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1408 {
1409         struct nfs_delegation *delegation;
1410         struct nfs4_opendata *opendata;
1411         fmode_t delegation_type = 0;
1412         int status;
1413
1414         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1415         if (IS_ERR(opendata))
1416                 return PTR_ERR(opendata);
1417         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1418         opendata->o_arg.fh = NFS_FH(state->inode);
1419         rcu_read_lock();
1420         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1421         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1422                 delegation_type = delegation->type;
1423         rcu_read_unlock();
1424         opendata->o_arg.u.delegation_type = delegation_type;
1425         status = nfs4_open_recover(opendata, state);
1426         nfs4_opendata_put(opendata);
1427         return status;
1428 }
1429
1430 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1431 {
1432         struct nfs_server *server = NFS_SERVER(state->inode);
1433         struct nfs4_exception exception = { };
1434         int err;
1435         do {
1436                 err = _nfs4_do_open_reclaim(ctx, state);
1437                 if (err != -NFS4ERR_DELAY)
1438                         break;
1439                 nfs4_handle_exception(server, err, &exception);
1440         } while (exception.retry);
1441         return err;
1442 }
1443
1444 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1445 {
1446         struct nfs_open_context *ctx;
1447         int ret;
1448
1449         ctx = nfs4_state_find_open_context(state);
1450         if (IS_ERR(ctx))
1451                 return PTR_ERR(ctx);
1452         ret = nfs4_do_open_reclaim(ctx, state);
1453         put_nfs_open_context(ctx);
1454         return ret;
1455 }
1456
1457 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1458 {
1459         struct nfs4_opendata *opendata;
1460         int ret;
1461
1462         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1463         if (IS_ERR(opendata))
1464                 return PTR_ERR(opendata);
1465         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1466         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1467         ret = nfs4_open_recover(opendata, state);
1468         nfs4_opendata_put(opendata);
1469         return ret;
1470 }
1471
1472 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1473 {
1474         struct nfs4_exception exception = { };
1475         struct nfs_server *server = NFS_SERVER(state->inode);
1476         int err;
1477         do {
1478                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1479                 switch (err) {
1480                         case 0:
1481                         case -ENOENT:
1482                         case -ESTALE:
1483                                 goto out;
1484                         case -NFS4ERR_BADSESSION:
1485                         case -NFS4ERR_BADSLOT:
1486                         case -NFS4ERR_BAD_HIGH_SLOT:
1487                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1488                         case -NFS4ERR_DEADSESSION:
1489                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1490                                 goto out;
1491                         case -NFS4ERR_STALE_CLIENTID:
1492                         case -NFS4ERR_STALE_STATEID:
1493                         case -NFS4ERR_EXPIRED:
1494                                 /* Don't recall a delegation if it was lost */
1495                                 nfs4_schedule_lease_recovery(server->nfs_client);
1496                                 goto out;
1497                         case -ERESTARTSYS:
1498                                 /*
1499                                  * The show must go on: exit, but mark the
1500                                  * stateid as needing recovery.
1501                                  */
1502                         case -NFS4ERR_DELEG_REVOKED:
1503                         case -NFS4ERR_ADMIN_REVOKED:
1504                         case -NFS4ERR_BAD_STATEID:
1505                                 nfs_inode_find_state_and_recover(state->inode,
1506                                                 stateid);
1507                                 nfs4_schedule_stateid_recovery(server, state);
1508                         case -EKEYEXPIRED:
1509                                 /*
1510                                  * User RPCSEC_GSS context has expired.
1511                                  * We cannot recover this stateid now, so
1512                                  * skip it and allow recovery thread to
1513                                  * proceed.
1514                                  */
1515                         case -ENOMEM:
1516                                 err = 0;
1517                                 goto out;
1518                 }
1519                 err = nfs4_handle_exception(server, err, &exception);
1520         } while (exception.retry);
1521 out:
1522         return err;
1523 }
1524
1525 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1526 {
1527         struct nfs4_opendata *data = calldata;
1528
1529         data->rpc_status = task->tk_status;
1530         if (data->rpc_status == 0) {
1531                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1532                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1533                 renew_lease(data->o_res.server, data->timestamp);
1534                 data->rpc_done = 1;
1535         }
1536 }
1537
1538 static void nfs4_open_confirm_release(void *calldata)
1539 {
1540         struct nfs4_opendata *data = calldata;
1541         struct nfs4_state *state = NULL;
1542
1543         /* If this request hasn't been cancelled, do nothing */
1544         if (data->cancelled == 0)
1545                 goto out_free;
1546         /* In case of error, no cleanup! */
1547         if (!data->rpc_done)
1548                 goto out_free;
1549         state = nfs4_opendata_to_nfs4_state(data);
1550         if (!IS_ERR(state))
1551                 nfs4_close_state(state, data->o_arg.fmode);
1552 out_free:
1553         nfs4_opendata_put(data);
1554 }
1555
1556 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1557         .rpc_call_done = nfs4_open_confirm_done,
1558         .rpc_release = nfs4_open_confirm_release,
1559 };
1560
1561 /*
1562  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1563  */
1564 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1565 {
1566         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1567         struct rpc_task *task;
1568         struct  rpc_message msg = {
1569                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1570                 .rpc_argp = &data->c_arg,
1571                 .rpc_resp = &data->c_res,
1572                 .rpc_cred = data->owner->so_cred,
1573         };
1574         struct rpc_task_setup task_setup_data = {
1575                 .rpc_client = server->client,
1576                 .rpc_message = &msg,
1577                 .callback_ops = &nfs4_open_confirm_ops,
1578                 .callback_data = data,
1579                 .workqueue = nfsiod_workqueue,
1580                 .flags = RPC_TASK_ASYNC,
1581         };
1582         int status;
1583
1584         kref_get(&data->kref);
1585         data->rpc_done = 0;
1586         data->rpc_status = 0;
1587         data->timestamp = jiffies;
1588         task = rpc_run_task(&task_setup_data);
1589         if (IS_ERR(task))
1590                 return PTR_ERR(task);
1591         status = nfs4_wait_for_completion_rpc_task(task);
1592         if (status != 0) {
1593                 data->cancelled = 1;
1594                 smp_wmb();
1595         } else
1596                 status = data->rpc_status;
1597         rpc_put_task(task);
1598         return status;
1599 }
1600
1601 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1602 {
1603         struct nfs4_opendata *data = calldata;
1604         struct nfs4_state_owner *sp = data->owner;
1605
1606         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1607                 return;
1608         /*
1609          * Check if we still need to send an OPEN call, or if we can use
1610          * a delegation instead.
1611          */
1612         if (data->state != NULL) {
1613                 struct nfs_delegation *delegation;
1614
1615                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1616                         goto out_no_action;
1617                 rcu_read_lock();
1618                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1619                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1620                     can_open_delegated(delegation, data->o_arg.fmode))
1621                         goto unlock_no_action;
1622                 rcu_read_unlock();
1623         }
1624         /* Update client id. */
1625         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1626         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1627                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1628                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1629                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1630         }
1631         data->timestamp = jiffies;
1632         if (nfs4_setup_sequence(data->o_arg.server,
1633                                 &data->o_arg.seq_args,
1634                                 &data->o_res.seq_res,
1635                                 task) != 0)
1636                 nfs_release_seqid(data->o_arg.seqid);
1637         else
1638                 rpc_call_start(task);
1639         return;
1640 unlock_no_action:
1641         rcu_read_unlock();
1642 out_no_action:
1643         task->tk_action = NULL;
1644
1645 }
1646
1647 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1648 {
1649         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1650         nfs4_open_prepare(task, calldata);
1651 }
1652
1653 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1654 {
1655         struct nfs4_opendata *data = calldata;
1656
1657         data->rpc_status = task->tk_status;
1658
1659         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1660                 return;
1661
1662         if (task->tk_status == 0) {
1663                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1664                         switch (data->o_res.f_attr->mode & S_IFMT) {
1665                         case S_IFREG:
1666                                 break;
1667                         case S_IFLNK:
1668                                 data->rpc_status = -ELOOP;
1669                                 break;
1670                         case S_IFDIR:
1671                                 data->rpc_status = -EISDIR;
1672                                 break;
1673                         default:
1674                                 data->rpc_status = -ENOTDIR;
1675                         }
1676                 }
1677                 renew_lease(data->o_res.server, data->timestamp);
1678                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1679                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1680         }
1681         data->rpc_done = 1;
1682 }
1683
1684 static void nfs4_open_release(void *calldata)
1685 {
1686         struct nfs4_opendata *data = calldata;
1687         struct nfs4_state *state = NULL;
1688
1689         /* If this request hasn't been cancelled, do nothing */
1690         if (data->cancelled == 0)
1691                 goto out_free;
1692         /* In case of error, no cleanup! */
1693         if (data->rpc_status != 0 || !data->rpc_done)
1694                 goto out_free;
1695         /* In case we need an open_confirm, no cleanup! */
1696         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1697                 goto out_free;
1698         state = nfs4_opendata_to_nfs4_state(data);
1699         if (!IS_ERR(state))
1700                 nfs4_close_state(state, data->o_arg.fmode);
1701 out_free:
1702         nfs4_opendata_put(data);
1703 }
1704
1705 static const struct rpc_call_ops nfs4_open_ops = {
1706         .rpc_call_prepare = nfs4_open_prepare,
1707         .rpc_call_done = nfs4_open_done,
1708         .rpc_release = nfs4_open_release,
1709 };
1710
1711 static const struct rpc_call_ops nfs4_recover_open_ops = {
1712         .rpc_call_prepare = nfs4_recover_open_prepare,
1713         .rpc_call_done = nfs4_open_done,
1714         .rpc_release = nfs4_open_release,
1715 };
1716
1717 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1718 {
1719         struct inode *dir = data->dir->d_inode;
1720         struct nfs_server *server = NFS_SERVER(dir);
1721         struct nfs_openargs *o_arg = &data->o_arg;
1722         struct nfs_openres *o_res = &data->o_res;
1723         struct rpc_task *task;
1724         struct rpc_message msg = {
1725                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1726                 .rpc_argp = o_arg,
1727                 .rpc_resp = o_res,
1728                 .rpc_cred = data->owner->so_cred,
1729         };
1730         struct rpc_task_setup task_setup_data = {
1731                 .rpc_client = server->client,
1732                 .rpc_message = &msg,
1733                 .callback_ops = &nfs4_open_ops,
1734                 .callback_data = data,
1735                 .workqueue = nfsiod_workqueue,
1736                 .flags = RPC_TASK_ASYNC,
1737         };
1738         int status;
1739
1740         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1741         kref_get(&data->kref);
1742         data->rpc_done = 0;
1743         data->rpc_status = 0;
1744         data->cancelled = 0;
1745         if (isrecover)
1746                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1747         task = rpc_run_task(&task_setup_data);
1748         if (IS_ERR(task))
1749                 return PTR_ERR(task);
1750         status = nfs4_wait_for_completion_rpc_task(task);
1751         if (status != 0) {
1752                 data->cancelled = 1;
1753                 smp_wmb();
1754         } else
1755                 status = data->rpc_status;
1756         rpc_put_task(task);
1757
1758         return status;
1759 }
1760
1761 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1762 {
1763         struct inode *dir = data->dir->d_inode;
1764         struct nfs_openres *o_res = &data->o_res;
1765         int status;
1766
1767         status = nfs4_run_open_task(data, 1);
1768         if (status != 0 || !data->rpc_done)
1769                 return status;
1770
1771         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1772
1773         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1774                 status = _nfs4_proc_open_confirm(data);
1775                 if (status != 0)
1776                         return status;
1777         }
1778
1779         return status;
1780 }
1781
1782 static int nfs4_opendata_access(struct rpc_cred *cred,
1783                                 struct nfs4_opendata *opendata,
1784                                 struct nfs4_state *state, fmode_t fmode)
1785 {
1786         struct nfs_access_entry cache;
1787         u32 mask;
1788
1789         /* access call failed or for some reason the server doesn't
1790          * support any access modes -- defer access call until later */
1791         if (opendata->o_res.access_supported == 0)
1792                 return 0;
1793
1794         mask = 0;
1795         /* don't check MAY_WRITE - a newly created file may not have
1796          * write mode bits, but POSIX allows the creating process to write */
1797         if (fmode & FMODE_READ)
1798                 mask |= MAY_READ;
1799         if (fmode & FMODE_EXEC)
1800                 mask |= MAY_EXEC;
1801
1802         cache.cred = cred;
1803         cache.jiffies = jiffies;
1804         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1805         nfs_access_add_cache(state->inode, &cache);
1806
1807         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1808                 return 0;
1809
1810         /* even though OPEN succeeded, access is denied. Close the file */
1811         nfs4_close_state(state, fmode);
1812         return -EACCES;
1813 }
1814
1815 /*
1816  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1817  */
1818 static int _nfs4_proc_open(struct nfs4_opendata *data)
1819 {
1820         struct inode *dir = data->dir->d_inode;
1821         struct nfs_server *server = NFS_SERVER(dir);
1822         struct nfs_openargs *o_arg = &data->o_arg;
1823         struct nfs_openres *o_res = &data->o_res;
1824         int status;
1825
1826         status = nfs4_run_open_task(data, 0);
1827         if (!data->rpc_done)
1828                 return status;
1829         if (status != 0) {
1830                 if (status == -NFS4ERR_BADNAME &&
1831                                 !(o_arg->open_flags & O_CREAT))
1832                         return -ENOENT;
1833                 return status;
1834         }
1835
1836         nfs_fattr_map_and_free_names(server, &data->f_attr);
1837
1838         if (o_arg->open_flags & O_CREAT)
1839                 update_changeattr(dir, &o_res->cinfo);
1840         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1841                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1842         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1843                 status = _nfs4_proc_open_confirm(data);
1844                 if (status != 0)
1845                         return status;
1846         }
1847         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1848                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1849         return 0;
1850 }
1851
1852 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1853 {
1854         unsigned int loop;
1855         int ret;
1856
1857         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1858                 ret = nfs4_wait_clnt_recover(clp);
1859                 if (ret != 0)
1860                         break;
1861                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1862                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1863                         break;
1864                 nfs4_schedule_state_manager(clp);
1865                 ret = -EIO;
1866         }
1867         return ret;
1868 }
1869
1870 static int nfs4_recover_expired_lease(struct nfs_server *server)
1871 {
1872         return nfs4_client_recover_expired_lease(server->nfs_client);
1873 }
1874
1875 /*
1876  * OPEN_EXPIRED:
1877  *      reclaim state on the server after a network partition.
1878  *      Assumes caller holds the appropriate lock
1879  */
1880 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1881 {
1882         struct nfs4_opendata *opendata;
1883         int ret;
1884
1885         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1886         if (IS_ERR(opendata))
1887                 return PTR_ERR(opendata);
1888         ret = nfs4_open_recover(opendata, state);
1889         if (ret == -ESTALE)
1890                 d_drop(ctx->dentry);
1891         nfs4_opendata_put(opendata);
1892         return ret;
1893 }
1894
1895 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1896 {
1897         struct nfs_server *server = NFS_SERVER(state->inode);
1898         struct nfs4_exception exception = { };
1899         int err;
1900
1901         do {
1902                 err = _nfs4_open_expired(ctx, state);
1903                 switch (err) {
1904                 default:
1905                         goto out;
1906                 case -NFS4ERR_GRACE:
1907                 case -NFS4ERR_DELAY:
1908                         nfs4_handle_exception(server, err, &exception);
1909                         err = 0;
1910                 }
1911         } while (exception.retry);
1912 out:
1913         return err;
1914 }
1915
1916 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1917 {
1918         struct nfs_open_context *ctx;
1919         int ret;
1920
1921         ctx = nfs4_state_find_open_context(state);
1922         if (IS_ERR(ctx))
1923                 return PTR_ERR(ctx);
1924         ret = nfs4_do_open_expired(ctx, state);
1925         put_nfs_open_context(ctx);
1926         return ret;
1927 }
1928
1929 #if defined(CONFIG_NFS_V4_1)
1930 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1931 {
1932         struct nfs_server *server = NFS_SERVER(state->inode);
1933         nfs4_stateid *stateid = &state->stateid;
1934         int status;
1935
1936         /* If a state reset has been done, test_stateid is unneeded */
1937         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1938                 return;
1939
1940         status = nfs41_test_stateid(server, stateid);
1941         if (status != NFS_OK) {
1942                 /* Free the stateid unless the server explicitly
1943                  * informs us the stateid is unrecognized. */
1944                 if (status != -NFS4ERR_BAD_STATEID)
1945                         nfs41_free_stateid(server, stateid);
1946                 nfs_remove_bad_delegation(state->inode);
1947
1948                 write_seqlock(&state->seqlock);
1949                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1950                 write_sequnlock(&state->seqlock);
1951                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1952         }
1953 }
1954
1955 /**
1956  * nfs41_check_open_stateid - possibly free an open stateid
1957  *
1958  * @state: NFSv4 state for an inode
1959  *
1960  * Returns NFS_OK if recovery for this stateid is now finished.
1961  * Otherwise a negative NFS4ERR value is returned.
1962  */
1963 static int nfs41_check_open_stateid(struct nfs4_state *state)
1964 {
1965         struct nfs_server *server = NFS_SERVER(state->inode);
1966         nfs4_stateid *stateid = &state->open_stateid;
1967         int status;
1968
1969         /* If a state reset has been done, test_stateid is unneeded */
1970         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1971             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1972             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1973                 return -NFS4ERR_BAD_STATEID;
1974
1975         status = nfs41_test_stateid(server, stateid);
1976         if (status != NFS_OK) {
1977                 /* Free the stateid unless the server explicitly
1978                  * informs us the stateid is unrecognized. */
1979                 if (status != -NFS4ERR_BAD_STATEID)
1980                         nfs41_free_stateid(server, stateid);
1981
1982                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1983                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1984                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1985         }
1986         return status;
1987 }
1988
1989 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1990 {
1991         int status;
1992
1993         nfs41_clear_delegation_stateid(state);
1994         status = nfs41_check_open_stateid(state);
1995         if (status != NFS_OK)
1996                 status = nfs4_open_expired(sp, state);
1997         return status;
1998 }
1999 #endif
2000
2001 /*
2002  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2003  * fields corresponding to attributes that were used to store the verifier.
2004  * Make sure we clobber those fields in the later setattr call
2005  */
2006 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2007 {
2008         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2009             !(sattr->ia_valid & ATTR_ATIME_SET))
2010                 sattr->ia_valid |= ATTR_ATIME;
2011
2012         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2013             !(sattr->ia_valid & ATTR_MTIME_SET))
2014                 sattr->ia_valid |= ATTR_MTIME;
2015 }
2016
2017 /*
2018  * Returns a referenced nfs4_state
2019  */
2020 static int _nfs4_do_open(struct inode *dir,
2021                         struct dentry *dentry,
2022                         fmode_t fmode,
2023                         int flags,
2024                         struct iattr *sattr,
2025                         struct rpc_cred *cred,
2026                         struct nfs4_state **res,
2027                         struct nfs4_threshold **ctx_th)
2028 {
2029         struct nfs4_state_owner  *sp;
2030         struct nfs4_state     *state = NULL;
2031         struct nfs_server       *server = NFS_SERVER(dir);
2032         struct nfs4_opendata *opendata;
2033         int status;
2034
2035         /* Protect against reboot recovery conflicts */
2036         status = -ENOMEM;
2037         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2038         if (sp == NULL) {
2039                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2040                 goto out_err;
2041         }
2042         status = nfs4_recover_expired_lease(server);
2043         if (status != 0)
2044                 goto err_put_state_owner;
2045         if (dentry->d_inode != NULL)
2046                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
2047         status = -ENOMEM;
2048         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
2049         if (opendata == NULL)
2050                 goto err_put_state_owner;
2051
2052         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2053                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2054                 if (!opendata->f_attr.mdsthreshold)
2055                         goto err_opendata_put;
2056                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2057         }
2058         if (dentry->d_inode != NULL)
2059                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
2060
2061         status = _nfs4_proc_open(opendata);
2062         if (status != 0)
2063                 goto err_opendata_put;
2064
2065         state = nfs4_opendata_to_nfs4_state(opendata);
2066         status = PTR_ERR(state);
2067         if (IS_ERR(state))
2068                 goto err_opendata_put;
2069         if (server->caps & NFS_CAP_POSIX_LOCK)
2070                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2071
2072         status = nfs4_opendata_access(cred, opendata, state, fmode);
2073         if (status != 0)
2074                 goto err_opendata_put;
2075
2076         if (opendata->o_arg.open_flags & O_EXCL) {
2077                 nfs4_exclusive_attrset(opendata, sattr);
2078
2079                 nfs_fattr_init(opendata->o_res.f_attr);
2080                 status = nfs4_do_setattr(state->inode, cred,
2081                                 opendata->o_res.f_attr, sattr,
2082                                 state);
2083                 if (status == 0)
2084                         nfs_setattr_update_inode(state->inode, sattr);
2085                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
2086         }
2087
2088         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
2089                 *ctx_th = opendata->f_attr.mdsthreshold;
2090         else
2091                 kfree(opendata->f_attr.mdsthreshold);
2092         opendata->f_attr.mdsthreshold = NULL;
2093
2094         nfs4_opendata_put(opendata);
2095         nfs4_put_state_owner(sp);
2096         *res = state;
2097         return 0;
2098 err_opendata_put:
2099         kfree(opendata->f_attr.mdsthreshold);
2100         nfs4_opendata_put(opendata);
2101 err_put_state_owner:
2102         nfs4_put_state_owner(sp);
2103 out_err:
2104         *res = NULL;
2105         return status;
2106 }
2107
2108
2109 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2110                                         struct dentry *dentry,
2111                                         fmode_t fmode,
2112                                         int flags,
2113                                         struct iattr *sattr,
2114                                         struct rpc_cred *cred,
2115                                         struct nfs4_threshold **ctx_th)
2116 {
2117         struct nfs4_exception exception = { };
2118         struct nfs4_state *res;
2119         int status;
2120
2121         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
2122         do {
2123                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
2124                                        &res, ctx_th);
2125                 if (status == 0)
2126                         break;
2127                 /* NOTE: BAD_SEQID means the server and client disagree about the
2128                  * book-keeping w.r.t. state-changing operations
2129                  * (OPEN/CLOSE/LOCK/LOCKU...)
2130                  * It is actually a sign of a bug on the client or on the server.
2131                  *
2132                  * If we receive a BAD_SEQID error in the particular case of
2133                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2134                  * have unhashed the old state_owner for us, and that we can
2135                  * therefore safely retry using a new one. We should still warn
2136                  * the user though...
2137                  */
2138                 if (status == -NFS4ERR_BAD_SEQID) {
2139                         pr_warn_ratelimited("NFS: v4 server %s "
2140                                         " returned a bad sequence-id error!\n",
2141                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2142                         exception.retry = 1;
2143                         continue;
2144                 }
2145                 /*
2146                  * BAD_STATEID on OPEN means that the server cancelled our
2147                  * state before it received the OPEN_CONFIRM.
2148                  * Recover by retrying the request as per the discussion
2149                  * on Page 181 of RFC3530.
2150                  */
2151                 if (status == -NFS4ERR_BAD_STATEID) {
2152                         exception.retry = 1;
2153                         continue;
2154                 }
2155                 if (status == -EAGAIN) {
2156                         /* We must have found a delegation */
2157                         exception.retry = 1;
2158                         continue;
2159                 }
2160                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
2161                                         status, &exception));
2162         } while (exception.retry);
2163         return res;
2164 }
2165
2166 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2167                             struct nfs_fattr *fattr, struct iattr *sattr,
2168                             struct nfs4_state *state)
2169 {
2170         struct nfs_server *server = NFS_SERVER(inode);
2171         struct nfs_setattrargs  arg = {
2172                 .fh             = NFS_FH(inode),
2173                 .iap            = sattr,
2174                 .server         = server,
2175                 .bitmask = server->attr_bitmask,
2176         };
2177         struct nfs_setattrres  res = {
2178                 .fattr          = fattr,
2179                 .server         = server,
2180         };
2181         struct rpc_message msg = {
2182                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2183                 .rpc_argp       = &arg,
2184                 .rpc_resp       = &res,
2185                 .rpc_cred       = cred,
2186         };
2187         unsigned long timestamp = jiffies;
2188         int status;
2189
2190         nfs_fattr_init(fattr);
2191
2192         if (state != NULL) {
2193                 struct nfs_lockowner lockowner = {
2194                         .l_owner = current->files,
2195                         .l_pid = current->tgid,
2196                 };
2197                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2198                                 &lockowner);
2199         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2200                                 FMODE_WRITE)) {
2201                 /* Use that stateid */
2202         } else
2203                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2204
2205         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2206         if (status == 0 && state != NULL)
2207                 renew_lease(server, timestamp);
2208         return status;
2209 }
2210
2211 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2212                            struct nfs_fattr *fattr, struct iattr *sattr,
2213                            struct nfs4_state *state)
2214 {
2215         struct nfs_server *server = NFS_SERVER(inode);
2216         struct nfs4_exception exception = {
2217                 .state = state,
2218                 .inode = inode,
2219         };
2220         int err;
2221         do {
2222                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2223                 switch (err) {
2224                 case -NFS4ERR_OPENMODE:
2225                         if (state && !(state->state & FMODE_WRITE)) {
2226                                 err = -EBADF;
2227                                 if (sattr->ia_valid & ATTR_OPEN)
2228                                         err = -EACCES;
2229                                 goto out;
2230                         }
2231                 }
2232                 err = nfs4_handle_exception(server, err, &exception);
2233         } while (exception.retry);
2234 out:
2235         return err;
2236 }
2237
2238 struct nfs4_closedata {
2239         struct inode *inode;
2240         struct nfs4_state *state;
2241         struct nfs_closeargs arg;
2242         struct nfs_closeres res;
2243         struct nfs_fattr fattr;
2244         unsigned long timestamp;
2245         bool roc;
2246         u32 roc_barrier;
2247 };
2248
2249 static void nfs4_free_closedata(void *data)
2250 {
2251         struct nfs4_closedata *calldata = data;
2252         struct nfs4_state_owner *sp = calldata->state->owner;
2253         struct super_block *sb = calldata->state->inode->i_sb;
2254
2255         if (calldata->roc)
2256                 pnfs_roc_release(calldata->state->inode);
2257         nfs4_put_open_state(calldata->state);
2258         nfs_free_seqid(calldata->arg.seqid);
2259         nfs4_put_state_owner(sp);
2260         nfs_sb_deactive_async(sb);
2261         kfree(calldata);
2262 }
2263
2264 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2265                 fmode_t fmode)
2266 {
2267         spin_lock(&state->owner->so_lock);
2268         if (!(fmode & FMODE_READ))
2269                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2270         if (!(fmode & FMODE_WRITE))
2271                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2272         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2273         spin_unlock(&state->owner->so_lock);
2274 }
2275
2276 static void nfs4_close_done(struct rpc_task *task, void *data)
2277 {
2278         struct nfs4_closedata *calldata = data;
2279         struct nfs4_state *state = calldata->state;
2280         struct nfs_server *server = NFS_SERVER(calldata->inode);
2281
2282         dprintk("%s: begin!\n", __func__);
2283         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2284                 return;
2285         /* hmm. we are done with the inode, and in the process of freeing
2286          * the state_owner. we keep this around to process errors
2287          */
2288         switch (task->tk_status) {
2289                 case 0:
2290                         if (calldata->roc)
2291                                 pnfs_roc_set_barrier(state->inode,
2292                                                      calldata->roc_barrier);
2293                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2294                         renew_lease(server, calldata->timestamp);
2295                         nfs4_close_clear_stateid_flags(state,
2296                                         calldata->arg.fmode);
2297                         break;
2298                 case -NFS4ERR_STALE_STATEID:
2299                 case -NFS4ERR_OLD_STATEID:
2300                 case -NFS4ERR_BAD_STATEID:
2301                 case -NFS4ERR_EXPIRED:
2302                         if (calldata->arg.fmode == 0)
2303                                 break;
2304                 default:
2305                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2306                                 rpc_restart_call_prepare(task);
2307         }
2308         nfs_release_seqid(calldata->arg.seqid);
2309         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2310         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2311 }
2312
2313 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2314 {
2315         struct nfs4_closedata *calldata = data;
2316         struct nfs4_state *state = calldata->state;
2317         struct inode *inode = calldata->inode;
2318         int call_close = 0;
2319
2320         dprintk("%s: begin!\n", __func__);
2321         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2322                 return;
2323
2324         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2325         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2326         spin_lock(&state->owner->so_lock);
2327         /* Calculate the change in open mode */
2328         if (state->n_rdwr == 0) {
2329                 if (state->n_rdonly == 0) {
2330                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2331                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2332                         calldata->arg.fmode &= ~FMODE_READ;
2333                 }
2334                 if (state->n_wronly == 0) {
2335                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2336                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2337                         calldata->arg.fmode &= ~FMODE_WRITE;
2338                 }
2339         }
2340         spin_unlock(&state->owner->so_lock);
2341
2342         if (!call_close) {
2343                 /* Note: exit _without_ calling nfs4_close_done */
2344                 task->tk_action = NULL;
2345                 goto out;
2346         }
2347
2348         if (calldata->arg.fmode == 0) {
2349                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2350                 if (calldata->roc &&
2351                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2352                         goto out;
2353         }
2354
2355         nfs_fattr_init(calldata->res.fattr);
2356         calldata->timestamp = jiffies;
2357         if (nfs4_setup_sequence(NFS_SERVER(inode),
2358                                 &calldata->arg.seq_args,
2359                                 &calldata->res.seq_res,
2360                                 task) != 0)
2361                 nfs_release_seqid(calldata->arg.seqid);
2362         else
2363                 rpc_call_start(task);
2364 out:
2365         dprintk("%s: done!\n", __func__);
2366 }
2367
2368 static const struct rpc_call_ops nfs4_close_ops = {
2369         .rpc_call_prepare = nfs4_close_prepare,
2370         .rpc_call_done = nfs4_close_done,
2371         .rpc_release = nfs4_free_closedata,
2372 };
2373
2374 /*
2375  * It is possible for data to be read/written from a mem-mapped file
2376  * after the sys_close call (which hits the vfs layer as a flush).
2377  * This means that we can't safely call nfsv4 close on a file until
2378  * the inode is cleared. This in turn means that we are not good
2379  * NFSv4 citizens - we do not indicate to the server to update the file's
2380  * share state even when we are done with one of the three share
2381  * stateid's in the inode.
2382  *
2383  * NOTE: Caller must be holding the sp->so_owner semaphore!
2384  */
2385 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2386 {
2387         struct nfs_server *server = NFS_SERVER(state->inode);
2388         struct nfs4_closedata *calldata;
2389         struct nfs4_state_owner *sp = state->owner;
2390         struct rpc_task *task;
2391         struct rpc_message msg = {
2392                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2393                 .rpc_cred = state->owner->so_cred,
2394         };
2395         struct rpc_task_setup task_setup_data = {
2396                 .rpc_client = server->client,
2397                 .rpc_message = &msg,
2398                 .callback_ops = &nfs4_close_ops,
2399                 .workqueue = nfsiod_workqueue,
2400                 .flags = RPC_TASK_ASYNC,
2401         };
2402         int status = -ENOMEM;
2403
2404         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2405         if (calldata == NULL)
2406                 goto out;
2407         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2408         calldata->inode = state->inode;
2409         calldata->state = state;
2410         calldata->arg.fh = NFS_FH(state->inode);
2411         calldata->arg.stateid = &state->open_stateid;
2412         /* Serialization for the sequence id */
2413         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2414         if (calldata->arg.seqid == NULL)
2415                 goto out_free_calldata;
2416         calldata->arg.fmode = 0;
2417         calldata->arg.bitmask = server->cache_consistency_bitmask;
2418         calldata->res.fattr = &calldata->fattr;
2419         calldata->res.seqid = calldata->arg.seqid;
2420         calldata->res.server = server;
2421         calldata->roc = pnfs_roc(state->inode);
2422         nfs_sb_active(calldata->inode->i_sb);
2423
2424         msg.rpc_argp = &calldata->arg;
2425         msg.rpc_resp = &calldata->res;
2426         task_setup_data.callback_data = calldata;
2427         task = rpc_run_task(&task_setup_data);
2428         if (IS_ERR(task))
2429                 return PTR_ERR(task);
2430         status = 0;
2431         if (wait)
2432                 status = rpc_wait_for_completion_task(task);
2433         rpc_put_task(task);
2434         return status;
2435 out_free_calldata:
2436         kfree(calldata);
2437 out:
2438         nfs4_put_open_state(state);
2439         nfs4_put_state_owner(sp);
2440         return status;
2441 }
2442
2443 static struct inode *
2444 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2445 {
2446         struct nfs4_state *state;
2447
2448         /* Protect against concurrent sillydeletes */
2449         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2450                              ctx->cred, &ctx->mdsthreshold);
2451         if (IS_ERR(state))
2452                 return ERR_CAST(state);
2453         ctx->state = state;
2454         return igrab(state->inode);
2455 }
2456
2457 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2458 {
2459         if (ctx->state == NULL)
2460                 return;
2461         if (is_sync)
2462                 nfs4_close_sync(ctx->state, ctx->mode);
2463         else
2464                 nfs4_close_state(ctx->state, ctx->mode);
2465 }
2466
2467 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2468 {
2469         struct nfs4_server_caps_arg args = {
2470                 .fhandle = fhandle,
2471         };
2472         struct nfs4_server_caps_res res = {};
2473         struct rpc_message msg = {
2474                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2475                 .rpc_argp = &args,
2476                 .rpc_resp = &res,
2477         };
2478         int status;
2479
2480         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2481         if (status == 0) {
2482                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2483                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2484                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2485                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2486                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2487                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2488                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2489                         server->caps |= NFS_CAP_ACLS;
2490                 if (res.has_links != 0)
2491                         server->caps |= NFS_CAP_HARDLINKS;
2492                 if (res.has_symlinks != 0)
2493                         server->caps |= NFS_CAP_SYMLINKS;
2494                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2495                         server->caps |= NFS_CAP_FILEID;
2496                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2497                         server->caps |= NFS_CAP_MODE;
2498                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2499                         server->caps |= NFS_CAP_NLINK;
2500                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2501                         server->caps |= NFS_CAP_OWNER;
2502                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2503                         server->caps |= NFS_CAP_OWNER_GROUP;
2504                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2505                         server->caps |= NFS_CAP_ATIME;
2506                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2507                         server->caps |= NFS_CAP_CTIME;
2508                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2509                         server->caps |= NFS_CAP_MTIME;
2510
2511                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2512                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2513                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2514                 server->acl_bitmask = res.acl_bitmask;
2515                 server->fh_expire_type = res.fh_expire_type;
2516         }
2517
2518         return status;
2519 }
2520
2521 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2522 {
2523         struct nfs4_exception exception = { };
2524         int err;
2525         do {
2526                 err = nfs4_handle_exception(server,
2527                                 _nfs4_server_capabilities(server, fhandle),
2528                                 &exception);
2529         } while (exception.retry);
2530         return err;
2531 }
2532
2533 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2534                 struct nfs_fsinfo *info)
2535 {
2536         struct nfs4_lookup_root_arg args = {
2537                 .bitmask = nfs4_fattr_bitmap,
2538         };
2539         struct nfs4_lookup_res res = {
2540                 .server = server,
2541                 .fattr = info->fattr,
2542                 .fh = fhandle,
2543         };
2544         struct rpc_message msg = {
2545                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2546                 .rpc_argp = &args,
2547                 .rpc_resp = &res,
2548         };
2549
2550         nfs_fattr_init(info->fattr);
2551         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2552 }
2553
2554 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2555                 struct nfs_fsinfo *info)
2556 {
2557         struct nfs4_exception exception = { };
2558         int err;
2559         do {
2560                 err = _nfs4_lookup_root(server, fhandle, info);
2561                 switch (err) {
2562                 case 0:
2563                 case -NFS4ERR_WRONGSEC:
2564                         goto out;
2565                 default:
2566                         err = nfs4_handle_exception(server, err, &exception);
2567                 }
2568         } while (exception.retry);
2569 out:
2570         return err;
2571 }
2572
2573 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2574                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2575 {
2576         struct rpc_auth *auth;
2577         int ret;
2578
2579         auth = rpcauth_create(flavor, server->client);
2580         if (IS_ERR(auth)) {
2581                 ret = -EIO;
2582                 goto out;
2583         }
2584         ret = nfs4_lookup_root(server, fhandle, info);
2585 out:
2586         return ret;
2587 }
2588
2589 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2590                               struct nfs_fsinfo *info)
2591 {
2592         int i, len, status = 0;
2593         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2594
2595         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2596         if (len < 0)
2597                 return len;
2598
2599         for (i = 0; i < len; i++) {
2600                 /* AUTH_UNIX is the default flavor if none was specified,
2601                  * thus has already been tried. */
2602                 if (flav_array[i] == RPC_AUTH_UNIX)
2603                         continue;
2604
2605                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2606                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2607                         continue;
2608                 break;
2609         }
2610         /*
2611          * -EACCESS could mean that the user doesn't have correct permissions
2612          * to access the mount.  It could also mean that we tried to mount
2613          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2614          * existing mount programs don't handle -EACCES very well so it should
2615          * be mapped to -EPERM instead.
2616          */
2617         if (status == -EACCES)
2618                 status = -EPERM;
2619         return status;
2620 }
2621
2622 /*
2623  * get the file handle for the "/" directory on the server
2624  */
2625 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2626                          struct nfs_fsinfo *info)
2627 {
2628         int minor_version = server->nfs_client->cl_minorversion;
2629         int status = nfs4_lookup_root(server, fhandle, info);
2630         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2631                 /*
2632                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2633                  * by nfs4_map_errors() as this function exits.
2634                  */
2635                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2636         if (status == 0)
2637                 status = nfs4_server_capabilities(server, fhandle);
2638         if (status == 0)
2639                 status = nfs4_do_fsinfo(server, fhandle, info);
2640         return nfs4_map_errors(status);
2641 }
2642
2643 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2644                               struct nfs_fsinfo *info)
2645 {
2646         int error;
2647         struct nfs_fattr *fattr = info->fattr;
2648
2649         error = nfs4_server_capabilities(server, mntfh);
2650         if (error < 0) {
2651                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2652                 return error;
2653         }
2654
2655         error = nfs4_proc_getattr(server, mntfh, fattr);
2656         if (error < 0) {
2657                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2658                 return error;
2659         }
2660
2661         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2662             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2663                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2664
2665         return error;
2666 }
2667
2668 /*
2669  * Get locations and (maybe) other attributes of a referral.
2670  * Note that we'll actually follow the referral later when
2671  * we detect fsid mismatch in inode revalidation
2672  */
2673 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2674                              const struct qstr *name, struct nfs_fattr *fattr,
2675                              struct nfs_fh *fhandle)
2676 {
2677         int status = -ENOMEM;
2678         struct page *page = NULL;
2679         struct nfs4_fs_locations *locations = NULL;
2680
2681         page = alloc_page(GFP_KERNEL);
2682         if (page == NULL)
2683                 goto out;
2684         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2685         if (locations == NULL)
2686                 goto out;
2687
2688         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2689         if (status != 0)
2690                 goto out;
2691         /* Make sure server returned a different fsid for the referral */
2692         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2693                 dprintk("%s: server did not return a different fsid for"
2694                         " a referral at %s\n", __func__, name->name);
2695                 status = -EIO;
2696                 goto out;
2697         }
2698         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2699         nfs_fixup_referral_attributes(&locations->fattr);
2700
2701         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2702         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2703         memset(fhandle, 0, sizeof(struct nfs_fh));
2704 out:
2705         if (page)
2706                 __free_page(page);
2707         kfree(locations);
2708         return status;
2709 }
2710
2711 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2712 {
2713         struct nfs4_getattr_arg args = {
2714                 .fh = fhandle,
2715                 .bitmask = server->attr_bitmask,
2716         };
2717         struct nfs4_getattr_res res = {
2718                 .fattr = fattr,
2719                 .server = server,
2720         };
2721         struct rpc_message msg = {
2722                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2723                 .rpc_argp = &args,
2724                 .rpc_resp = &res,
2725         };
2726
2727         nfs_fattr_init(fattr);
2728         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2729 }
2730
2731 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2732 {
2733         struct nfs4_exception exception = { };
2734         int err;
2735         do {
2736                 err = nfs4_handle_exception(server,
2737                                 _nfs4_proc_getattr(server, fhandle, fattr),
2738                                 &exception);
2739         } while (exception.retry);
2740         return err;
2741 }
2742
2743 /*
2744  * The file is not closed if it is opened due to the a request to change
2745  * the size of the file. The open call will not be needed once the
2746  * VFS layer lookup-intents are implemented.
2747  *
2748  * Close is called when the inode is destroyed.
2749  * If we haven't opened the file for O_WRONLY, we
2750  * need to in the size_change case to obtain a stateid.
2751  *
2752  * Got race?
2753  * Because OPEN is always done by name in nfsv4, it is
2754  * possible that we opened a different file by the same
2755  * name.  We can recognize this race condition, but we
2756  * can't do anything about it besides returning an error.
2757  *
2758  * This will be fixed with VFS changes (lookup-intent).
2759  */
2760 static int
2761 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2762                   struct iattr *sattr)
2763 {
2764         struct inode *inode = dentry->d_inode;
2765         struct rpc_cred *cred = NULL;
2766         struct nfs4_state *state = NULL;
2767         int status;
2768
2769         if (pnfs_ld_layoutret_on_setattr(inode))
2770                 pnfs_return_layout(inode);
2771
2772         nfs_fattr_init(fattr);
2773
2774         /* Deal with open(O_TRUNC) */
2775         if (sattr->ia_valid & ATTR_OPEN)
2776                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2777
2778         /* Optimization: if the end result is no change, don't RPC */
2779         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2780                 return 0;
2781
2782         /* Search for an existing open(O_WRITE) file */
2783         if (sattr->ia_valid & ATTR_FILE) {
2784                 struct nfs_open_context *ctx;
2785
2786                 ctx = nfs_file_open_context(sattr->ia_file);
2787                 if (ctx) {
2788                         cred = ctx->cred;
2789                         state = ctx->state;
2790                 }
2791         }
2792
2793         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2794         if (status == 0)
2795                 nfs_setattr_update_inode(inode, sattr);
2796         return status;
2797 }
2798
2799 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2800                 const struct qstr *name, struct nfs_fh *fhandle,
2801                 struct nfs_fattr *fattr)
2802 {
2803         struct nfs_server *server = NFS_SERVER(dir);
2804         int                    status;
2805         struct nfs4_lookup_arg args = {
2806                 .bitmask = server->attr_bitmask,
2807                 .dir_fh = NFS_FH(dir),
2808                 .name = name,
2809         };
2810         struct nfs4_lookup_res res = {
2811                 .server = server,
2812                 .fattr = fattr,
2813                 .fh = fhandle,
2814         };
2815         struct rpc_message msg = {
2816                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2817                 .rpc_argp = &args,
2818                 .rpc_resp = &res,
2819         };
2820
2821         nfs_fattr_init(fattr);
2822
2823         dprintk("NFS call  lookup %s\n", name->name);
2824         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2825         dprintk("NFS reply lookup: %d\n", status);
2826         return status;
2827 }
2828
2829 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2830 {
2831         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2832                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2833         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2834         fattr->nlink = 2;
2835 }
2836
2837 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2838                                    struct qstr *name, struct nfs_fh *fhandle,
2839                                    struct nfs_fattr *fattr)
2840 {
2841         struct nfs4_exception exception = { };
2842         struct rpc_clnt *client = *clnt;
2843         int err;
2844         do {
2845                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2846                 switch (err) {
2847                 case -NFS4ERR_BADNAME:
2848                         err = -ENOENT;
2849                         goto out;
2850                 case -NFS4ERR_MOVED:
2851                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2852                         goto out;
2853                 case -NFS4ERR_WRONGSEC:
2854                         err = -EPERM;
2855                         if (client != *clnt)
2856                                 goto out;
2857
2858                         client = nfs4_create_sec_client(client, dir, name);
2859                         if (IS_ERR(client))
2860                                 return PTR_ERR(client);
2861
2862                         exception.retry = 1;
2863                         break;
2864                 default:
2865                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2866                 }
2867         } while (exception.retry);
2868
2869 out:
2870         if (err == 0)
2871                 *clnt = client;
2872         else if (client != *clnt)
2873                 rpc_shutdown_client(client);
2874
2875         return err;
2876 }
2877
2878 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2879                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2880 {
2881         int status;
2882         struct rpc_clnt *client = NFS_CLIENT(dir);
2883
2884         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2885         if (client != NFS_CLIENT(dir)) {
2886                 rpc_shutdown_client(client);
2887                 nfs_fixup_secinfo_attributes(fattr);
2888         }
2889         return status;
2890 }
2891
2892 struct rpc_clnt *
2893 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2894                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2895 {
2896         int status;
2897         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2898
2899         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2900         if (status < 0) {
2901                 rpc_shutdown_client(client);
2902                 return ERR_PTR(status);
2903         }
2904         return client;
2905 }
2906
2907 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2908 {
2909         struct nfs_server *server = NFS_SERVER(inode);
2910         struct nfs4_accessargs args = {
2911                 .fh = NFS_FH(inode),
2912                 .bitmask = server->cache_consistency_bitmask,
2913         };
2914         struct nfs4_accessres res = {
2915                 .server = server,
2916         };
2917         struct rpc_message msg = {
2918                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2919                 .rpc_argp = &args,
2920                 .rpc_resp = &res,
2921                 .rpc_cred = entry->cred,
2922         };
2923         int mode = entry->mask;
2924         int status;
2925
2926         /*
2927          * Determine which access bits we want to ask for...
2928          */
2929         if (mode & MAY_READ)
2930                 args.access |= NFS4_ACCESS_READ;
2931         if (S_ISDIR(inode->i_mode)) {
2932                 if (mode & MAY_WRITE)
2933                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2934                 if (mode & MAY_EXEC)
2935                         args.access |= NFS4_ACCESS_LOOKUP;
2936         } else {
2937                 if (mode & MAY_WRITE)
2938                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2939                 if (mode & MAY_EXEC)
2940                         args.access |= NFS4_ACCESS_EXECUTE;
2941         }
2942
2943         res.fattr = nfs_alloc_fattr();
2944         if (res.fattr == NULL)
2945                 return -ENOMEM;
2946
2947         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2948         if (!status) {
2949                 nfs_access_set_mask(entry, res.access);
2950                 nfs_refresh_inode(inode, res.fattr);
2951         }
2952         nfs_free_fattr(res.fattr);
2953         return status;
2954 }
2955
2956 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2957 {
2958         struct nfs4_exception exception = { };
2959         int err;
2960         do {
2961                 err = nfs4_handle_exception(NFS_SERVER(inode),
2962                                 _nfs4_proc_access(inode, entry),
2963                                 &exception);
2964         } while (exception.retry);
2965         return err;
2966 }
2967
2968 /*
2969  * TODO: For the time being, we don't try to get any attributes
2970  * along with any of the zero-copy operations READ, READDIR,
2971  * READLINK, WRITE.
2972  *
2973  * In the case of the first three, we want to put the GETATTR
2974  * after the read-type operation -- this is because it is hard
2975  * to predict the length of a GETATTR response in v4, and thus
2976  * align the READ data correctly.  This means that the GETATTR
2977  * may end up partially falling into the page cache, and we should
2978  * shift it into the 'tail' of the xdr_buf before processing.
2979  * To do this efficiently, we need to know the total length
2980  * of data received, which doesn't seem to be available outside
2981  * of the RPC layer.
2982  *
2983  * In the case of WRITE, we also want to put the GETATTR after
2984  * the operation -- in this case because we want to make sure
2985  * we get the post-operation mtime and size.
2986  *
2987  * Both of these changes to the XDR layer would in fact be quite
2988  * minor, but I decided to leave them for a subsequent patch.
2989  */
2990 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2991                 unsigned int pgbase, unsigned int pglen)
2992 {
2993         struct nfs4_readlink args = {
2994                 .fh       = NFS_FH(inode),
2995                 .pgbase   = pgbase,
2996                 .pglen    = pglen,
2997                 .pages    = &page,
2998         };
2999         struct nfs4_readlink_res res;
3000         struct rpc_message msg = {
3001                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3002                 .rpc_argp = &args,
3003                 .rpc_resp = &res,
3004         };
3005
3006         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3007 }
3008
3009 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3010                 unsigned int pgbase, unsigned int pglen)
3011 {
3012         struct nfs4_exception exception = { };
3013         int err;
3014         do {
3015                 err = nfs4_handle_exception(NFS_SERVER(inode),
3016                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
3017                                 &exception);
3018         } while (exception.retry);
3019         return err;
3020 }
3021
3022 /*
3023  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3024  */
3025 static int
3026 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3027                  int flags)
3028 {
3029         struct nfs_open_context *ctx;
3030         struct nfs4_state *state;
3031         int status = 0;
3032
3033         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3034         if (IS_ERR(ctx))
3035                 return PTR_ERR(ctx);
3036
3037         sattr->ia_mode &= ~current_umask();
3038         state = nfs4_do_open(dir, dentry, ctx->mode,
3039                         flags, sattr, ctx->cred,
3040                         &ctx->mdsthreshold);
3041         d_drop(dentry);
3042         if (IS_ERR(state)) {
3043                 status = PTR_ERR(state);
3044                 goto out;
3045         }
3046         d_add(dentry, igrab(state->inode));
3047         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
3048         ctx->state = state;
3049 out:
3050         put_nfs_open_context(ctx);
3051         return status;
3052 }
3053
3054 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3055 {
3056         struct nfs_server *server = NFS_SERVER(dir);
3057         struct nfs_removeargs args = {
3058                 .fh = NFS_FH(dir),
3059                 .name = *name,
3060         };
3061         struct nfs_removeres res = {
3062                 .server = server,
3063         };
3064         struct rpc_message msg = {
3065                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3066                 .rpc_argp = &args,
3067                 .rpc_resp = &res,
3068         };
3069         int status;
3070
3071         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3072         if (status == 0)
3073                 update_changeattr(dir, &res.cinfo);
3074         return status;
3075 }
3076
3077 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3078 {
3079         struct nfs4_exception exception = { };
3080         int err;
3081         do {
3082                 err = nfs4_handle_exception(NFS_SERVER(dir),
3083                                 _nfs4_proc_remove(dir, name),
3084                                 &exception);
3085         } while (exception.retry);
3086         return err;
3087 }
3088
3089 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3090 {
3091         struct nfs_server *server = NFS_SERVER(dir);
3092         struct nfs_removeargs *args = msg->rpc_argp;
3093         struct nfs_removeres *res = msg->rpc_resp;
3094
3095         res->server = server;
3096         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3097         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
3098 }
3099
3100 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3101 {
3102         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
3103                                 &data->args.seq_args,
3104                                 &data->res.seq_res,
3105                                 task))
3106                 return;
3107         rpc_call_start(task);
3108 }
3109
3110 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3111 {
3112         struct nfs_removeres *res = task->tk_msg.rpc_resp;
3113
3114         if (!nfs4_sequence_done(task, &res->seq_res))
3115                 return 0;
3116         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3117                 return 0;
3118         update_changeattr(dir, &res->cinfo);
3119         return 1;
3120 }
3121
3122 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3123 {
3124         struct nfs_server *server = NFS_SERVER(dir);
3125         struct nfs_renameargs *arg = msg->rpc_argp;
3126         struct nfs_renameres *res = msg->rpc_resp;
3127
3128         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3129         res->server = server;
3130         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
3131 }
3132
3133 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3134 {
3135         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3136                                 &data->args.seq_args,
3137                                 &data->res.seq_res,
3138                                 task))
3139                 return;
3140         rpc_call_start(task);
3141 }
3142
3143 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3144                                  struct inode *new_dir)
3145 {
3146         struct nfs_renameres *res = task->tk_msg.rpc_resp;
3147
3148         if (!nfs4_sequence_done(task, &res->seq_res))
3149                 return 0;
3150         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
3151                 return 0;
3152
3153         update_changeattr(old_dir, &res->old_cinfo);
3154         update_changeattr(new_dir, &res->new_cinfo);
3155         return 1;
3156 }
3157
3158 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3159                 struct inode *new_dir, struct qstr *new_name)
3160 {
3161         struct nfs_server *server = NFS_SERVER(old_dir);
3162         struct nfs_renameargs arg = {
3163                 .old_dir = NFS_FH(old_dir),
3164                 .new_dir = NFS_FH(new_dir),
3165                 .old_name = old_name,
3166                 .new_name = new_name,
3167         };
3168         struct nfs_renameres res = {
3169                 .server = server,
3170         };
3171         struct rpc_message msg = {
3172                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
3173                 .rpc_argp = &arg,
3174                 .rpc_resp = &res,
3175         };
3176         int status = -ENOMEM;
3177
3178         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3179         if (!status) {
3180                 update_changeattr(old_dir, &res.old_cinfo);
3181                 update_changeattr(new_dir, &res.new_cinfo);
3182         }
3183         return status;
3184 }
3185
3186 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3187                 struct inode *new_dir, struct qstr *new_name)
3188 {
3189         struct nfs4_exception exception = { };
3190         int err;
3191         do {
3192                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3193                                 _nfs4_proc_rename(old_dir, old_name,
3194                                         new_dir, new_name),
3195                                 &exception);
3196         } while (exception.retry);
3197         return err;
3198 }
3199
3200 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3201 {
3202         struct nfs_server *server = NFS_SERVER(inode);
3203         struct nfs4_link_arg arg = {
3204                 .fh     = NFS_FH(inode),
3205                 .dir_fh = NFS_FH(dir),
3206                 .name   = name,
3207                 .bitmask = server->attr_bitmask,
3208         };
3209         struct nfs4_link_res res = {
3210                 .server = server,
3211         };
3212         struct rpc_message msg = {
3213                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3214                 .rpc_argp = &arg,
3215                 .rpc_resp = &res,
3216         };
3217         int status = -ENOMEM;
3218
3219         res.fattr = nfs_alloc_fattr();
3220         if (res.fattr == NULL)
3221                 goto out;
3222
3223         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3224         if (!status) {
3225                 update_changeattr(dir, &res.cinfo);
3226                 nfs_post_op_update_inode(inode, res.fattr);
3227         }
3228 out:
3229         nfs_free_fattr(res.fattr);
3230         return status;
3231 }
3232
3233 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3234 {
3235         struct nfs4_exception exception = { };
3236         int err;
3237         do {
3238                 err = nfs4_handle_exception(NFS_SERVER(inode),
3239                                 _nfs4_proc_link(inode, dir, name),
3240                                 &exception);
3241         } while (exception.retry);
3242         return err;
3243 }
3244
3245 struct nfs4_createdata {
3246         struct rpc_message msg;
3247         struct nfs4_create_arg arg;
3248         struct nfs4_create_res res;
3249         struct nfs_fh fh;
3250         struct nfs_fattr fattr;
3251 };
3252
3253 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3254                 struct qstr *name, struct iattr *sattr, u32 ftype)
3255 {
3256         struct nfs4_createdata *data;
3257
3258         data = kzalloc(sizeof(*data), GFP_KERNEL);
3259         if (data != NULL) {
3260                 struct nfs_server *server = NFS_SERVER(dir);
3261
3262                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3263                 data->msg.rpc_argp = &data->arg;
3264                 data->msg.rpc_resp = &data->res;
3265                 data->arg.dir_fh = NFS_FH(dir);
3266                 data->arg.server = server;
3267                 data->arg.name = name;
3268                 data->arg.attrs = sattr;
3269                 data->arg.ftype = ftype;
3270                 data->arg.bitmask = server->attr_bitmask;
3271                 data->res.server = server;
3272                 data->res.fh = &data->fh;
3273                 data->res.fattr = &data->fattr;
3274                 nfs_fattr_init(data->res.fattr);
3275         }
3276         return data;
3277 }
3278
3279 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3280 {
3281         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3282                                     &data->arg.seq_args, &data->res.seq_res, 1);
3283         if (status == 0) {
3284                 update_changeattr(dir, &data->res.dir_cinfo);
3285                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3286         }
3287         return status;
3288 }
3289
3290 static void nfs4_free_createdata(struct nfs4_createdata *data)
3291 {
3292         kfree(data);
3293 }
3294
3295 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3296                 struct page *page, unsigned int len, struct iattr *sattr)
3297 {
3298         struct nfs4_createdata *data;
3299         int status = -ENAMETOOLONG;
3300
3301         if (len > NFS4_MAXPATHLEN)
3302                 goto out;
3303
3304         status = -ENOMEM;
3305         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3306         if (data == NULL)
3307                 goto out;
3308
3309         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3310         data->arg.u.symlink.pages = &page;
3311         data->arg.u.symlink.len = len;
3312
3313         status = nfs4_do_create(dir, dentry, data);
3314
3315         nfs4_free_createdata(data);
3316 out:
3317         return status;
3318 }
3319
3320 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3321                 struct page *page, unsigned int len, struct iattr *sattr)
3322 {
3323         struct nfs4_exception exception = { };
3324         int err;
3325         do {
3326                 err = nfs4_handle_exception(NFS_SERVER(dir),
3327                                 _nfs4_proc_symlink(dir, dentry, page,
3328                                                         len, sattr),
3329                                 &exception);
3330         } while (exception.retry);
3331         return err;
3332 }
3333
3334 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3335                 struct iattr *sattr)
3336 {
3337         struct nfs4_createdata *data;
3338         int status = -ENOMEM;
3339
3340         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3341         if (data == NULL)
3342                 goto out;
3343
3344         status = nfs4_do_create(dir, dentry, data);
3345
3346         nfs4_free_createdata(data);
3347 out:
3348         return status;
3349 }
3350
3351 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3352                 struct iattr *sattr)
3353 {
3354         struct nfs4_exception exception = { };
3355         int err;
3356
3357         sattr->ia_mode &= ~current_umask();
3358         do {
3359                 err = nfs4_handle_exception(NFS_SERVER(dir),
3360                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3361                                 &exception);
3362         } while (exception.retry);
3363         return err;
3364 }
3365
3366 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3367                 u64 cookie, struct page **pages, unsigned int count, int plus)
3368 {
3369         struct inode            *dir = dentry->d_inode;
3370         struct nfs4_readdir_arg args = {
3371                 .fh = NFS_FH(dir),
3372                 .pages = pages,
3373                 .pgbase = 0,
3374                 .count = count,
3375                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3376                 .plus = plus,
3377         };
3378         struct nfs4_readdir_res res;
3379         struct rpc_message msg = {
3380                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3381                 .rpc_argp = &args,
3382                 .rpc_resp = &res,
3383                 .rpc_cred = cred,
3384         };
3385         int                     status;
3386
3387         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3388                         dentry->d_parent->d_name.name,
3389                         dentry->d_name.name,
3390                         (unsigned long long)cookie);
3391         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3392         res.pgbase = args.pgbase;
3393         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3394         if (status >= 0) {
3395                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3396                 status += args.pgbase;
3397         }
3398
3399         nfs_invalidate_atime(dir);
3400
3401         dprintk("%s: returns %d\n", __func__, status);
3402         return status;
3403 }
3404
3405 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3406                 u64 cookie, struct page **pages, unsigned int count, int plus)
3407 {
3408         struct nfs4_exception exception = { };
3409         int err;
3410         do {
3411                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3412                                 _nfs4_proc_readdir(dentry, cred, cookie,
3413                                         pages, count, plus),
3414                                 &exception);
3415         } while (exception.retry);
3416         return err;
3417 }
3418
3419 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3420                 struct iattr *sattr, dev_t rdev)
3421 {
3422         struct nfs4_createdata *data;
3423         int mode = sattr->ia_mode;
3424         int status = -ENOMEM;
3425
3426         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3427         if (data == NULL)
3428                 goto out;
3429
3430         if (S_ISFIFO(mode))
3431                 data->arg.ftype = NF4FIFO;
3432         else if (S_ISBLK(mode)) {
3433                 data->arg.ftype = NF4BLK;
3434                 data->arg.u.device.specdata1 = MAJOR(rdev);
3435                 data->arg.u.device.specdata2 = MINOR(rdev);
3436         }
3437         else if (S_ISCHR(mode)) {
3438                 data->arg.ftype = NF4CHR;
3439                 data->arg.u.device.specdata1 = MAJOR(rdev);
3440                 data->arg.u.device.specdata2 = MINOR(rdev);
3441         } else if (!S_ISSOCK(mode)) {
3442                 status = -EINVAL;
3443                 goto out_free;
3444         }
3445
3446         status = nfs4_do_create(dir, dentry, data);
3447 out_free:
3448         nfs4_free_createdata(data);
3449 out:
3450         return status;
3451 }
3452
3453 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3454                 struct iattr *sattr, dev_t rdev)
3455 {
3456         struct nfs4_exception exception = { };
3457         int err;
3458
3459         sattr->ia_mode &= ~current_umask();
3460         do {
3461                 err = nfs4_handle_exception(NFS_SERVER(dir),
3462                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3463                                 &exception);
3464         } while (exception.retry);
3465         return err;
3466 }
3467
3468 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3469                  struct nfs_fsstat *fsstat)
3470 {
3471         struct nfs4_statfs_arg args = {
3472                 .fh = fhandle,
3473                 .bitmask = server->attr_bitmask,
3474         };
3475         struct nfs4_statfs_res res = {
3476                 .fsstat = fsstat,
3477         };
3478         struct rpc_message msg = {
3479                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3480                 .rpc_argp = &args,
3481                 .rpc_resp = &res,
3482         };
3483
3484         nfs_fattr_init(fsstat->fattr);
3485         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3486 }
3487
3488 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3489 {
3490         struct nfs4_exception exception = { };
3491         int err;
3492         do {
3493                 err = nfs4_handle_exception(server,
3494                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3495                                 &exception);
3496         } while (exception.retry);
3497         return err;
3498 }
3499
3500 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3501                 struct nfs_fsinfo *fsinfo)
3502 {
3503         struct nfs4_fsinfo_arg args = {
3504                 .fh = fhandle,
3505                 .bitmask = server->attr_bitmask,
3506         };
3507         struct nfs4_fsinfo_res res = {
3508                 .fsinfo = fsinfo,
3509         };
3510         struct rpc_message msg = {
3511                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3512                 .rpc_argp = &args,
3513                 .rpc_resp = &res,
3514         };
3515
3516         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3517 }
3518
3519 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3520 {
3521         struct nfs4_exception exception = { };
3522         int err;
3523
3524         do {
3525                 err = nfs4_handle_exception(server,
3526                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3527                                 &exception);
3528         } while (exception.retry);
3529         return err;
3530 }
3531
3532 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3533 {
3534         int error;
3535
3536         nfs_fattr_init(fsinfo->fattr);
3537         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3538         if (error == 0) {
3539                 /* block layout checks this! */
3540                 server->pnfs_blksize = fsinfo->blksize;
3541                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3542         }
3543
3544         return error;
3545 }
3546
3547 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3548                 struct nfs_pathconf *pathconf)
3549 {
3550         struct nfs4_pathconf_arg args = {
3551                 .fh = fhandle,
3552                 .bitmask = server->attr_bitmask,
3553         };
3554         struct nfs4_pathconf_res res = {
3555                 .pathconf = pathconf,
3556         };
3557         struct rpc_message msg = {
3558                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3559                 .rpc_argp = &args,
3560                 .rpc_resp = &res,
3561         };
3562
3563         /* None of the pathconf attributes are mandatory to implement */
3564         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3565                 memset(pathconf, 0, sizeof(*pathconf));
3566                 return 0;
3567         }
3568
3569         nfs_fattr_init(pathconf->fattr);
3570         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3571 }
3572
3573 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3574                 struct nfs_pathconf *pathconf)
3575 {
3576         struct nfs4_exception exception = { };
3577         int err;
3578
3579         do {
3580                 err = nfs4_handle_exception(server,
3581                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3582                                 &exception);
3583         } while (exception.retry);
3584         return err;
3585 }
3586
3587 void __nfs4_read_done_cb(struct nfs_read_data *data)
3588 {
3589         nfs_invalidate_atime(data->header->inode);
3590 }
3591
3592 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3593 {
3594         struct nfs_server *server = NFS_SERVER(data->header->inode);
3595
3596         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3597                 rpc_restart_call_prepare(task);
3598                 return -EAGAIN;
3599         }
3600
3601         __nfs4_read_done_cb(data);
3602         if (task->tk_status > 0)
3603                 renew_lease(server, data->timestamp);
3604         return 0;
3605 }
3606
3607 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3608 {
3609
3610         dprintk("--> %s\n", __func__);
3611
3612         if (!nfs4_sequence_done(task, &data->res.seq_res))
3613                 return -EAGAIN;
3614
3615         return data->read_done_cb ? data->read_done_cb(task, data) :
3616                                     nfs4_read_done_cb(task, data);
3617 }
3618
3619 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3620 {
3621         data->timestamp   = jiffies;
3622         data->read_done_cb = nfs4_read_done_cb;
3623         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3624         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3625 }
3626
3627 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3628 {
3629         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3630                                 &data->args.seq_args,
3631                                 &data->res.seq_res,
3632                                 task))
3633                 return;
3634         rpc_call_start(task);
3635 }
3636
3637 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3638 {
3639         struct inode *inode = data->header->inode;
3640
3641         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3642                 rpc_restart_call_prepare(task);
3643                 return -EAGAIN;
3644         }
3645         if (task->tk_status >= 0) {
3646                 renew_lease(NFS_SERVER(inode), data->timestamp);
3647                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3648         }
3649         return 0;
3650 }
3651
3652 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3653 {
3654         if (!nfs4_sequence_done(task, &data->res.seq_res))
3655                 return -EAGAIN;
3656         return data->write_done_cb ? data->write_done_cb(task, data) :
3657                 nfs4_write_done_cb(task, data);
3658 }
3659
3660 static
3661 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3662 {
3663         const struct nfs_pgio_header *hdr = data->header;
3664
3665         /* Don't request attributes for pNFS or O_DIRECT writes */
3666         if (data->ds_clp != NULL || hdr->dreq != NULL)
3667                 return false;
3668         /* Otherwise, request attributes if and only if we don't hold
3669          * a delegation
3670          */
3671         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3672 }
3673
3674 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3675 {
3676         struct nfs_server *server = NFS_SERVER(data->header->inode);
3677
3678         if (!nfs4_write_need_cache_consistency_data(data)) {
3679                 data->args.bitmask = NULL;
3680                 data->res.fattr = NULL;
3681         } else
3682                 data->args.bitmask = server->cache_consistency_bitmask;
3683
3684         if (!data->write_done_cb)
3685                 data->write_done_cb = nfs4_write_done_cb;
3686         data->res.server = server;
3687         data->timestamp   = jiffies;
3688
3689         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3690         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3691 }
3692
3693 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3694 {
3695         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3696                                 &data->args.seq_args,
3697                                 &data->res.seq_res,
3698                                 task))
3699                 return;
3700         rpc_call_start(task);
3701 }
3702
3703 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3704 {
3705         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3706                                 &data->args.seq_args,
3707                                 &data->res.seq_res,
3708                                 task))
3709                 return;
3710         rpc_call_start(task);
3711 }
3712
3713 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3714 {
3715         struct inode *inode = data->inode;
3716
3717         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3718                 rpc_restart_call_prepare(task);
3719                 return -EAGAIN;
3720         }
3721         return 0;
3722 }
3723
3724 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3725 {
3726         if (!nfs4_sequence_done(task, &data->res.seq_res))
3727                 return -EAGAIN;
3728         return data->commit_done_cb(task, data);
3729 }
3730
3731 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3732 {
3733         struct nfs_server *server = NFS_SERVER(data->inode);
3734
3735         if (data->commit_done_cb == NULL)
3736                 data->commit_done_cb = nfs4_commit_done_cb;
3737         data->res.server = server;
3738         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3739         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3740 }
3741
3742 struct nfs4_renewdata {
3743         struct nfs_client       *client;
3744         unsigned long           timestamp;
3745 };
3746
3747 /*
3748  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3749  * standalone procedure for queueing an asynchronous RENEW.
3750  */
3751 static void nfs4_renew_release(void *calldata)
3752 {
3753         struct nfs4_renewdata *data = calldata;
3754         struct nfs_client *clp = data->client;
3755
3756         if (atomic_read(&clp->cl_count) > 1)
3757                 nfs4_schedule_state_renewal(clp);
3758         nfs_put_client(clp);
3759         kfree(data);
3760 }
3761
3762 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3763 {
3764         struct nfs4_renewdata *data = calldata;
3765         struct nfs_client *clp = data->client;
3766         unsigned long timestamp = data->timestamp;
3767
3768         if (task->tk_status < 0) {
3769                 /* Unless we're shutting down, schedule state recovery! */
3770                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3771                         return;
3772                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3773                         nfs4_schedule_lease_recovery(clp);
3774                         return;
3775                 }
3776                 nfs4_schedule_path_down_recovery(clp);
3777         }
3778         do_renew_lease(clp, timestamp);
3779 }
3780
3781 static const struct rpc_call_ops nfs4_renew_ops = {
3782         .rpc_call_done = nfs4_renew_done,
3783         .rpc_release = nfs4_renew_release,
3784 };
3785
3786 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3787 {
3788         struct rpc_message msg = {
3789                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3790                 .rpc_argp       = clp,
3791                 .rpc_cred       = cred,
3792         };
3793         struct nfs4_renewdata *data;
3794
3795         if (renew_flags == 0)
3796                 return 0;
3797         if (!atomic_inc_not_zero(&clp->cl_count))
3798                 return -EIO;
3799         data = kmalloc(sizeof(*data), GFP_NOFS);
3800         if (data == NULL)
3801                 return -ENOMEM;
3802         data->client = clp;
3803         data->timestamp = jiffies;
3804         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3805                         &nfs4_renew_ops, data);
3806 }
3807
3808 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3809 {
3810         struct rpc_message msg = {
3811                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3812                 .rpc_argp       = clp,
3813                 .rpc_cred       = cred,
3814         };
3815         unsigned long now = jiffies;
3816         int status;
3817
3818         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3819         if (status < 0)
3820                 return status;
3821         do_renew_lease(clp, now);
3822         return 0;
3823 }
3824
3825 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3826 {
3827         return (server->caps & NFS_CAP_ACLS)
3828                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3829                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3830 }
3831
3832 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3833  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3834  * the stack.
3835  */
3836 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3837
3838 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3839                 struct page **pages, unsigned int *pgbase)
3840 {
3841         struct page *newpage, **spages;
3842         int rc = 0;
3843         size_t len;
3844         spages = pages;
3845
3846         do {
3847                 len = min_t(size_t, PAGE_SIZE, buflen);
3848                 newpage = alloc_page(GFP_KERNEL);
3849
3850                 if (newpage == NULL)
3851                         goto unwind;
3852                 memcpy(page_address(newpage), buf, len);
3853                 buf += len;
3854                 buflen -= len;
3855                 *pages++ = newpage;
3856                 rc++;
3857         } while (buflen != 0);
3858
3859         return rc;
3860
3861 unwind:
3862         for(; rc > 0; rc--)
3863                 __free_page(spages[rc-1]);
3864         return -ENOMEM;
3865 }
3866
3867 struct nfs4_cached_acl {
3868         int cached;
3869         size_t len;
3870         char data[0];
3871 };
3872
3873 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3874 {
3875         struct nfs_inode *nfsi = NFS_I(inode);
3876
3877         spin_lock(&inode->i_lock);
3878         kfree(nfsi->nfs4_acl);
3879         nfsi->nfs4_acl = acl;
3880         spin_unlock(&inode->i_lock);
3881 }
3882
3883 static void nfs4_zap_acl_attr(struct inode *inode)
3884 {
3885         nfs4_set_cached_acl(inode, NULL);
3886 }
3887
3888 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3889 {
3890         struct nfs_inode *nfsi = NFS_I(inode);
3891         struct nfs4_cached_acl *acl;
3892         int ret = -ENOENT;
3893
3894         spin_lock(&inode->i_lock);
3895         acl = nfsi->nfs4_acl;
3896         if (acl == NULL)
3897                 goto out;
3898         if (buf == NULL) /* user is just asking for length */
3899                 goto out_len;
3900         if (acl->cached == 0)
3901                 goto out;
3902         ret = -ERANGE; /* see getxattr(2) man page */
3903         if (acl->len > buflen)
3904                 goto out;
3905         memcpy(buf, acl->data, acl->len);
3906 out_len:
3907         ret = acl->len;
3908 out:
3909         spin_unlock(&inode->i_lock);
3910         return ret;
3911 }
3912
3913 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3914 {
3915         struct nfs4_cached_acl *acl;
3916         size_t buflen = sizeof(*acl) + acl_len;
3917
3918         if (buflen <= PAGE_SIZE) {
3919                 acl = kmalloc(buflen, GFP_KERNEL);
3920                 if (acl == NULL)
3921                         goto out;
3922                 acl->cached = 1;
3923                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3924         } else {
3925                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3926                 if (acl == NULL)
3927                         goto out;
3928                 acl->cached = 0;
3929         }
3930         acl->len = acl_len;
3931 out:
3932         nfs4_set_cached_acl(inode, acl);
3933 }
3934
3935 /*
3936  * The getxattr API returns the required buffer length when called with a
3937  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3938  * the required buf.  On a NULL buf, we send a page of data to the server
3939  * guessing that the ACL request can be serviced by a page. If so, we cache
3940  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3941  * the cache. If not so, we throw away the page, and cache the required
3942  * length. The next getxattr call will then produce another round trip to
3943  * the server, this time with the input buf of the required size.
3944  */
3945 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3946 {
3947         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3948         struct nfs_getaclargs args = {
3949                 .fh = NFS_FH(inode),
3950                 .acl_pages = pages,
3951                 .acl_len = buflen,
3952         };
3953         struct nfs_getaclres res = {
3954                 .acl_len = buflen,
3955         };
3956         struct rpc_message msg = {
3957                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3958                 .rpc_argp = &args,
3959                 .rpc_resp = &res,
3960         };
3961         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3962         int ret = -ENOMEM, i;
3963
3964         /* As long as we're doing a round trip to the server anyway,
3965          * let's be prepared for a page of acl data. */
3966         if (npages == 0)
3967                 npages = 1;
3968         if (npages > ARRAY_SIZE(pages))
3969                 return -ERANGE;
3970
3971         for (i = 0; i < npages; i++) {
3972                 pages[i] = alloc_page(GFP_KERNEL);
3973                 if (!pages[i])
3974                         goto out_free;
3975         }
3976
3977         /* for decoding across pages */
3978         res.acl_scratch = alloc_page(GFP_KERNEL);
3979         if (!res.acl_scratch)
3980                 goto out_free;
3981
3982         args.acl_len = npages * PAGE_SIZE;
3983         args.acl_pgbase = 0;
3984
3985         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3986                 __func__, buf, buflen, npages, args.acl_len);
3987         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3988                              &msg, &args.seq_args, &res.seq_res, 0);
3989         if (ret)
3990                 goto out_free;
3991
3992         /* Handle the case where the passed-in buffer is too short */
3993         if (res.acl_flags & NFS4_ACL_TRUNC) {
3994                 /* Did the user only issue a request for the acl length? */
3995                 if (buf == NULL)
3996                         goto out_ok;
3997                 ret = -ERANGE;
3998                 goto out_free;
3999         }
4000         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4001         if (buf)
4002                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4003 out_ok:
4004         ret = res.acl_len;
4005 out_free:
4006         for (i = 0; i < npages; i++)
4007                 if (pages[i])
4008                         __free_page(pages[i]);
4009         if (res.acl_scratch)
4010                 __free_page(res.acl_scratch);
4011         return ret;
4012 }
4013
4014 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4015 {
4016         struct nfs4_exception exception = { };
4017         ssize_t ret;
4018         do {
4019                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4020                 if (ret >= 0)
4021                         break;
4022                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4023         } while (exception.retry);
4024         return ret;
4025 }
4026
4027 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4028 {
4029         struct nfs_server *server = NFS_SERVER(inode);
4030         int ret;
4031
4032         if (!nfs4_server_supports_acls(server))
4033                 return -EOPNOTSUPP;
4034         ret = nfs_revalidate_inode(server, inode);
4035         if (ret < 0)
4036                 return ret;
4037         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4038                 nfs_zap_acl_cache(inode);
4039         ret = nfs4_read_cached_acl(inode, buf, buflen);
4040         if (ret != -ENOENT)
4041                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4042                  * but no cached acl data, just the acl length */
4043                 return ret;
4044         return nfs4_get_acl_uncached(inode, buf, buflen);
4045 }
4046
4047 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4048 {
4049         struct nfs_server *server = NFS_SERVER(inode);
4050         struct page *pages[NFS4ACL_MAXPAGES];
4051         struct nfs_setaclargs arg = {
4052                 .fh             = NFS_FH(inode),
4053                 .acl_pages      = pages,
4054                 .acl_len        = buflen,
4055         };
4056         struct nfs_setaclres res;
4057         struct rpc_message msg = {
4058                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4059                 .rpc_argp       = &arg,
4060                 .rpc_resp       = &res,
4061         };
4062         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4063         int ret, i;
4064
4065         if (!nfs4_server_supports_acls(server))
4066                 return -EOPNOTSUPP;
4067         if (npages > ARRAY_SIZE(pages))
4068                 return -ERANGE;
4069         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4070         if (i < 0)
4071                 return i;
4072         nfs4_inode_return_delegation(inode);
4073         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4074
4075         /*
4076          * Free each page after tx, so the only ref left is
4077          * held by the network stack
4078          */
4079         for (; i > 0; i--)
4080                 put_page(pages[i-1]);
4081
4082         /*
4083          * Acl update can result in inode attribute update.
4084          * so mark the attribute cache invalid.
4085          */
4086         spin_lock(&inode->i_lock);
4087         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4088         spin_unlock(&inode->i_lock);
4089         nfs_access_zap_cache(inode);
4090         nfs_zap_acl_cache(inode);
4091         return ret;
4092 }
4093
4094 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4095 {
4096         struct nfs4_exception exception = { };
4097         int err;
4098         do {
4099                 err = nfs4_handle_exception(NFS_SERVER(inode),
4100                                 __nfs4_proc_set_acl(inode, buf, buflen),
4101                                 &exception);
4102         } while (exception.retry);
4103         return err;
4104 }
4105
4106 static int
4107 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
4108 {
4109         struct nfs_client *clp = server->nfs_client;
4110
4111         if (task->tk_status >= 0)
4112                 return 0;
4113         switch(task->tk_status) {
4114                 case -NFS4ERR_DELEG_REVOKED:
4115                 case -NFS4ERR_ADMIN_REVOKED:
4116                 case -NFS4ERR_BAD_STATEID:
4117                         if (state == NULL)
4118                                 break;
4119                         nfs_remove_bad_delegation(state->inode);
4120                 case -NFS4ERR_OPENMODE:
4121                         if (state == NULL)
4122                                 break;
4123                         nfs4_schedule_stateid_recovery(server, state);
4124                         goto wait_on_recovery;
4125                 case -NFS4ERR_EXPIRED:
4126                         if (state != NULL)
4127                                 nfs4_schedule_stateid_recovery(server, state);
4128                 case -NFS4ERR_STALE_STATEID:
4129                 case -NFS4ERR_STALE_CLIENTID:
4130                         nfs4_schedule_lease_recovery(clp);
4131                         goto wait_on_recovery;
4132 #if defined(CONFIG_NFS_V4_1)
4133                 case -NFS4ERR_BADSESSION:
4134                 case -NFS4ERR_BADSLOT:
4135                 case -NFS4ERR_BAD_HIGH_SLOT:
4136                 case -NFS4ERR_DEADSESSION:
4137                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4138                 case -NFS4ERR_SEQ_FALSE_RETRY:
4139                 case -NFS4ERR_SEQ_MISORDERED:
4140                         dprintk("%s ERROR %d, Reset session\n", __func__,
4141                                 task->tk_status);
4142                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4143                         task->tk_status = 0;
4144                         return -EAGAIN;
4145 #endif /* CONFIG_NFS_V4_1 */
4146                 case -NFS4ERR_DELAY:
4147                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4148                 case -NFS4ERR_GRACE:
4149                 case -EKEYEXPIRED:
4150                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4151                         task->tk_status = 0;
4152                         return -EAGAIN;
4153                 case -NFS4ERR_RETRY_UNCACHED_REP:
4154                 case -NFS4ERR_OLD_STATEID:
4155                         task->tk_status = 0;
4156                         return -EAGAIN;
4157         }
4158         task->tk_status = nfs4_map_errors(task->tk_status);
4159         return 0;
4160 wait_on_recovery:
4161         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4162         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4163                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4164         task->tk_status = 0;
4165         return -EAGAIN;
4166 }
4167
4168 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4169                                     nfs4_verifier *bootverf)
4170 {
4171         __be32 verf[2];
4172
4173         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4174                 /* An impossible timestamp guarantees this value
4175                  * will never match a generated boot time. */
4176                 verf[0] = 0;
4177                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
4178         } else {
4179                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4180                 verf[0] = (__be32)nn->boot_time.tv_sec;
4181                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4182         }
4183         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4184 }
4185
4186 static unsigned int
4187 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4188                                    char *buf, size_t len)
4189 {
4190         unsigned int result;
4191
4192         rcu_read_lock();
4193         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4194                                 clp->cl_ipaddr,
4195                                 rpc_peeraddr2str(clp->cl_rpcclient,
4196                                                         RPC_DISPLAY_ADDR),
4197                                 rpc_peeraddr2str(clp->cl_rpcclient,
4198                                                         RPC_DISPLAY_PROTO));
4199         rcu_read_unlock();
4200         return result;
4201 }
4202
4203 static unsigned int
4204 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4205                                 char *buf, size_t len)
4206 {
4207         char *nodename = clp->cl_rpcclient->cl_nodename;
4208
4209         if (nfs4_client_id_uniquifier[0] != '\0')
4210                 nodename = nfs4_client_id_uniquifier;
4211         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4212                                 clp->rpc_ops->version, clp->cl_minorversion,
4213                                 nodename);
4214 }
4215
4216 /**
4217  * nfs4_proc_setclientid - Negotiate client ID
4218  * @clp: state data structure
4219  * @program: RPC program for NFSv4 callback service
4220  * @port: IP port number for NFS4 callback service
4221  * @cred: RPC credential to use for this call
4222  * @res: where to place the result
4223  *
4224  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4225  */
4226 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4227                 unsigned short port, struct rpc_cred *cred,
4228                 struct nfs4_setclientid_res *res)
4229 {
4230         nfs4_verifier sc_verifier;
4231         struct nfs4_setclientid setclientid = {
4232                 .sc_verifier = &sc_verifier,
4233                 .sc_prog = program,
4234                 .sc_cb_ident = clp->cl_cb_ident,
4235         };
4236         struct rpc_message msg = {
4237                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4238                 .rpc_argp = &setclientid,
4239                 .rpc_resp = res,
4240                 .rpc_cred = cred,
4241         };
4242         int status;
4243
4244         /* nfs_client_id4 */
4245         nfs4_init_boot_verifier(clp, &sc_verifier);
4246         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4247                 setclientid.sc_name_len =
4248                                 nfs4_init_uniform_client_string(clp,
4249                                                 setclientid.sc_name,
4250                                                 sizeof(setclientid.sc_name));
4251         else
4252                 setclientid.sc_name_len =
4253                                 nfs4_init_nonuniform_client_string(clp,
4254                                                 setclientid.sc_name,
4255                                                 sizeof(setclientid.sc_name));
4256         /* cb_client4 */
4257         rcu_read_lock();
4258         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4259                                 sizeof(setclientid.sc_netid),
4260                                 rpc_peeraddr2str(clp->cl_rpcclient,
4261                                                         RPC_DISPLAY_NETID));
4262         rcu_read_unlock();
4263         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4264                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4265                                 clp->cl_ipaddr, port >> 8, port & 255);
4266
4267         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4268                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4269                 setclientid.sc_name_len, setclientid.sc_name);
4270         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4271         dprintk("NFS reply setclientid: %d\n", status);
4272         return status;
4273 }
4274
4275 /**
4276  * nfs4_proc_setclientid_confirm - Confirm client ID
4277  * @clp: state data structure
4278  * @res: result of a previous SETCLIENTID
4279  * @cred: RPC credential to use for this call
4280  *
4281  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4282  */
4283 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4284                 struct nfs4_setclientid_res *arg,
4285                 struct rpc_cred *cred)
4286 {
4287         struct nfs_fsinfo fsinfo;
4288         struct rpc_message msg = {
4289                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4290                 .rpc_argp = arg,
4291                 .rpc_resp = &fsinfo,
4292                 .rpc_cred = cred,
4293         };
4294         unsigned long now;
4295         int status;
4296
4297         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4298                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4299                 clp->cl_clientid);
4300         now = jiffies;
4301         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4302         if (status == 0) {
4303                 spin_lock(&clp->cl_lock);
4304                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4305                 clp->cl_last_renewal = now;
4306                 spin_unlock(&clp->cl_lock);
4307         }
4308         dprintk("NFS reply setclientid_confirm: %d\n", status);
4309         return status;
4310 }
4311
4312 struct nfs4_delegreturndata {
4313         struct nfs4_delegreturnargs args;
4314         struct nfs4_delegreturnres res;
4315         struct nfs_fh fh;
4316         nfs4_stateid stateid;
4317         unsigned long timestamp;
4318         struct nfs_fattr fattr;
4319         int rpc_status;
4320 };
4321
4322 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4323 {
4324         struct nfs4_delegreturndata *data = calldata;
4325
4326         if (!nfs4_sequence_done(task, &data->res.seq_res))
4327                 return;
4328
4329         switch (task->tk_status) {
4330         case -NFS4ERR_STALE_STATEID:
4331         case -NFS4ERR_EXPIRED:
4332         case 0:
4333                 renew_lease(data->res.server, data->timestamp);
4334                 break;
4335         default:
4336                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4337                                 -EAGAIN) {
4338                         rpc_restart_call_prepare(task);
4339                         return;
4340                 }
4341         }
4342         data->rpc_status = task->tk_status;
4343 }
4344
4345 static void nfs4_delegreturn_release(void *calldata)
4346 {
4347         kfree(calldata);
4348 }
4349
4350 #if defined(CONFIG_NFS_V4_1)
4351 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4352 {
4353         struct nfs4_delegreturndata *d_data;
4354
4355         d_data = (struct nfs4_delegreturndata *)data;
4356
4357         if (nfs4_setup_sequence(d_data->res.server,
4358                                 &d_data->args.seq_args,
4359                                 &d_data->res.seq_res, task))
4360                 return;
4361         rpc_call_start(task);
4362 }
4363 #endif /* CONFIG_NFS_V4_1 */
4364
4365 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4366 #if defined(CONFIG_NFS_V4_1)
4367         .rpc_call_prepare = nfs4_delegreturn_prepare,
4368 #endif /* CONFIG_NFS_V4_1 */
4369         .rpc_call_done = nfs4_delegreturn_done,
4370         .rpc_release = nfs4_delegreturn_release,
4371 };
4372
4373 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4374 {
4375         struct nfs4_delegreturndata *data;
4376         struct nfs_server *server = NFS_SERVER(inode);
4377         struct rpc_task *task;
4378         struct rpc_message msg = {
4379                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4380                 .rpc_cred = cred,
4381         };
4382         struct rpc_task_setup task_setup_data = {
4383                 .rpc_client = server->client,
4384                 .rpc_message = &msg,
4385                 .callback_ops = &nfs4_delegreturn_ops,
4386                 .flags = RPC_TASK_ASYNC,
4387         };
4388         int status = 0;
4389
4390         data = kzalloc(sizeof(*data), GFP_NOFS);
4391         if (data == NULL)
4392                 return -ENOMEM;
4393         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4394         data->args.fhandle = &data->fh;
4395         data->args.stateid = &data->stateid;
4396         data->args.bitmask = server->cache_consistency_bitmask;
4397         nfs_copy_fh(&data->fh, NFS_FH(inode));
4398         nfs4_stateid_copy(&data->stateid, stateid);
4399         data->res.fattr = &data->fattr;
4400         data->res.server = server;
4401         nfs_fattr_init(data->res.fattr);
4402         data->timestamp = jiffies;
4403         data->rpc_status = 0;
4404
4405         task_setup_data.callback_data = data;
4406         msg.rpc_argp = &data->args;
4407         msg.rpc_resp = &data->res;
4408         task = rpc_run_task(&task_setup_data);
4409         if (IS_ERR(task))
4410                 return PTR_ERR(task);
4411         if (!issync)
4412                 goto out;
4413         status = nfs4_wait_for_completion_rpc_task(task);
4414         if (status != 0)
4415                 goto out;
4416         status = data->rpc_status;
4417         if (status == 0)
4418                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4419         else
4420                 nfs_refresh_inode(inode, &data->fattr);
4421 out:
4422         rpc_put_task(task);
4423         return status;
4424 }
4425
4426 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4427 {
4428         struct nfs_server *server = NFS_SERVER(inode);
4429         struct nfs4_exception exception = { };
4430         int err;
4431         do {
4432                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4433                 switch (err) {
4434                         case -NFS4ERR_STALE_STATEID:
4435                         case -NFS4ERR_EXPIRED:
4436                         case 0:
4437                                 return 0;
4438                 }
4439                 err = nfs4_handle_exception(server, err, &exception);
4440         } while (exception.retry);
4441         return err;
4442 }
4443
4444 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4445 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4446
4447 /*
4448  * sleep, with exponential backoff, and retry the LOCK operation.
4449  */
4450 static unsigned long
4451 nfs4_set_lock_task_retry(unsigned long timeout)
4452 {
4453         freezable_schedule_timeout_killable(timeout);
4454         timeout <<= 1;
4455         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4456                 return NFS4_LOCK_MAXTIMEOUT;
4457         return timeout;
4458 }
4459
4460 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4461 {
4462         struct inode *inode = state->inode;
4463         struct nfs_server *server = NFS_SERVER(inode);
4464         struct nfs_client *clp = server->nfs_client;
4465         struct nfs_lockt_args arg = {
4466                 .fh = NFS_FH(inode),
4467                 .fl = request,
4468         };
4469         struct nfs_lockt_res res = {
4470                 .denied = request,
4471         };
4472         struct rpc_message msg = {
4473                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4474                 .rpc_argp       = &arg,
4475                 .rpc_resp       = &res,
4476                 .rpc_cred       = state->owner->so_cred,
4477         };
4478         struct nfs4_lock_state *lsp;
4479         int status;
4480
4481         arg.lock_owner.clientid = clp->cl_clientid;
4482         status = nfs4_set_lock_state(state, request);
4483         if (status != 0)
4484                 goto out;
4485         lsp = request->fl_u.nfs4_fl.owner;
4486         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4487         arg.lock_owner.s_dev = server->s_dev;
4488         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4489         switch (status) {
4490                 case 0:
4491                         request->fl_type = F_UNLCK;
4492                         break;
4493                 case -NFS4ERR_DENIED:
4494                         status = 0;
4495         }
4496         request->fl_ops->fl_release_private(request);
4497 out:
4498         return status;
4499 }
4500
4501 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4502 {
4503         struct nfs4_exception exception = { };
4504         int err;
4505
4506         do {
4507                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4508                                 _nfs4_proc_getlk(state, cmd, request),
4509                                 &exception);
4510         } while (exception.retry);
4511         return err;
4512 }
4513
4514 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4515 {
4516         int res = 0;
4517         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4518                 case FL_POSIX:
4519                         res = posix_lock_file_wait(file, fl);
4520                         break;
4521                 case FL_FLOCK:
4522                         res = flock_lock_file_wait(file, fl);
4523                         break;
4524                 default:
4525                         BUG();
4526         }
4527         return res;
4528 }
4529
4530 struct nfs4_unlockdata {
4531         struct nfs_locku_args arg;
4532         struct nfs_locku_res res;
4533         struct nfs4_lock_state *lsp;
4534         struct nfs_open_context *ctx;
4535         struct file_lock fl;
4536         const struct nfs_server *server;
4537         unsigned long timestamp;
4538 };
4539
4540 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4541                 struct nfs_open_context *ctx,
4542                 struct nfs4_lock_state *lsp,
4543                 struct nfs_seqid *seqid)
4544 {
4545         struct nfs4_unlockdata *p;
4546         struct inode *inode = lsp->ls_state->inode;
4547
4548         p = kzalloc(sizeof(*p), GFP_NOFS);
4549         if (p == NULL)
4550                 return NULL;
4551         p->arg.fh = NFS_FH(inode);
4552         p->arg.fl = &p->fl;
4553         p->arg.seqid = seqid;
4554         p->res.seqid = seqid;
4555         p->arg.stateid = &lsp->ls_stateid;
4556         p->lsp = lsp;
4557         atomic_inc(&lsp->ls_count);
4558         /* Ensure we don't close file until we're done freeing locks! */
4559         p->ctx = get_nfs_open_context(ctx);
4560         memcpy(&p->fl, fl, sizeof(p->fl));
4561         p->server = NFS_SERVER(inode);
4562         return p;
4563 }
4564
4565 static void nfs4_locku_release_calldata(void *data)
4566 {
4567         struct nfs4_unlockdata *calldata = data;
4568         nfs_free_seqid(calldata->arg.seqid);
4569         nfs4_put_lock_state(calldata->lsp);
4570         put_nfs_open_context(calldata->ctx);
4571         kfree(calldata);
4572 }
4573
4574 static void nfs4_locku_done(struct rpc_task *task, void *data)
4575 {
4576         struct nfs4_unlockdata *calldata = data;
4577
4578         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4579                 return;
4580         switch (task->tk_status) {
4581                 case 0:
4582                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4583                                         &calldata->res.stateid);
4584                         renew_lease(calldata->server, calldata->timestamp);
4585                         break;
4586                 case -NFS4ERR_BAD_STATEID:
4587                 case -NFS4ERR_OLD_STATEID:
4588                 case -NFS4ERR_STALE_STATEID:
4589                 case -NFS4ERR_EXPIRED:
4590                         break;
4591                 default:
4592                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4593                                 rpc_restart_call_prepare(task);
4594         }
4595         nfs_release_seqid(calldata->arg.seqid);
4596 }
4597
4598 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4599 {
4600         struct nfs4_unlockdata *calldata = data;
4601
4602         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4603                 return;
4604         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4605                 /* Note: exit _without_ running nfs4_locku_done */
4606                 task->tk_action = NULL;
4607                 return;
4608         }
4609         calldata->timestamp = jiffies;
4610         if (nfs4_setup_sequence(calldata->server,
4611                                 &calldata->arg.seq_args,
4612                                 &calldata->res.seq_res,
4613                                 task) != 0)
4614                 nfs_release_seqid(calldata->arg.seqid);
4615         else
4616                 rpc_call_start(task);
4617 }
4618
4619 static const struct rpc_call_ops nfs4_locku_ops = {
4620         .rpc_call_prepare = nfs4_locku_prepare,
4621         .rpc_call_done = nfs4_locku_done,
4622         .rpc_release = nfs4_locku_release_calldata,
4623 };
4624
4625 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4626                 struct nfs_open_context *ctx,
4627                 struct nfs4_lock_state *lsp,
4628                 struct nfs_seqid *seqid)
4629 {
4630         struct nfs4_unlockdata *data;
4631         struct rpc_message msg = {
4632                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4633                 .rpc_cred = ctx->cred,
4634         };
4635         struct rpc_task_setup task_setup_data = {
4636                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4637                 .rpc_message = &msg,
4638                 .callback_ops = &nfs4_locku_ops,
4639                 .workqueue = nfsiod_workqueue,
4640                 .flags = RPC_TASK_ASYNC,
4641         };
4642
4643         /* Ensure this is an unlock - when canceling a lock, the
4644          * canceled lock is passed in, and it won't be an unlock.
4645          */
4646         fl->fl_type = F_UNLCK;
4647
4648         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4649         if (data == NULL) {
4650                 nfs_free_seqid(seqid);
4651                 return ERR_PTR(-ENOMEM);
4652         }
4653
4654         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4655         msg.rpc_argp = &data->arg;
4656         msg.rpc_resp = &data->res;
4657         task_setup_data.callback_data = data;
4658         return rpc_run_task(&task_setup_data);
4659 }
4660
4661 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4662 {
4663         struct nfs_inode *nfsi = NFS_I(state->inode);
4664         struct nfs_seqid *seqid;
4665         struct nfs4_lock_state *lsp;
4666         struct rpc_task *task;
4667         int status = 0;
4668         unsigned char fl_flags = request->fl_flags;
4669
4670         status = nfs4_set_lock_state(state, request);
4671         /* Unlock _before_ we do the RPC call */
4672         request->fl_flags |= FL_EXISTS;
4673         down_read(&nfsi->rwsem);
4674         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4675                 up_read(&nfsi->rwsem);
4676                 goto out;
4677         }
4678         up_read(&nfsi->rwsem);
4679         if (status != 0)
4680                 goto out;
4681         /* Is this a delegated lock? */
4682         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4683                 goto out;
4684         lsp = request->fl_u.nfs4_fl.owner;
4685         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4686         status = -ENOMEM;
4687         if (seqid == NULL)
4688                 goto out;
4689         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4690         status = PTR_ERR(task);
4691         if (IS_ERR(task))
4692                 goto out;
4693         status = nfs4_wait_for_completion_rpc_task(task);
4694         rpc_put_task(task);
4695 out:
4696         request->fl_flags = fl_flags;
4697         return status;
4698 }
4699
4700 struct nfs4_lockdata {
4701         struct nfs_lock_args arg;
4702         struct nfs_lock_res res;
4703         struct nfs4_lock_state *lsp;
4704         struct nfs_open_context *ctx;
4705         struct file_lock fl;
4706         unsigned long timestamp;
4707         int rpc_status;
4708         int cancelled;
4709         struct nfs_server *server;
4710 };
4711
4712 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4713                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4714                 gfp_t gfp_mask)
4715 {
4716         struct nfs4_lockdata *p;
4717         struct inode *inode = lsp->ls_state->inode;
4718         struct nfs_server *server = NFS_SERVER(inode);
4719
4720         p = kzalloc(sizeof(*p), gfp_mask);
4721         if (p == NULL)
4722                 return NULL;
4723
4724         p->arg.fh = NFS_FH(inode);
4725         p->arg.fl = &p->fl;
4726         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4727         if (p->arg.open_seqid == NULL)
4728                 goto out_free;
4729         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4730         if (p->arg.lock_seqid == NULL)
4731                 goto out_free_seqid;
4732         p->arg.lock_stateid = &lsp->ls_stateid;
4733         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4734         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4735         p->arg.lock_owner.s_dev = server->s_dev;
4736         p->res.lock_seqid = p->arg.lock_seqid;
4737         p->lsp = lsp;
4738         p->server = server;
4739         atomic_inc(&lsp->ls_count);
4740         p->ctx = get_nfs_open_context(ctx);
4741         memcpy(&p->fl, fl, sizeof(p->fl));
4742         return p;
4743 out_free_seqid:
4744         nfs_free_seqid(p->arg.open_seqid);
4745 out_free:
4746         kfree(p);
4747         return NULL;
4748 }
4749
4750 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4751 {
4752         struct nfs4_lockdata *data = calldata;
4753         struct nfs4_state *state = data->lsp->ls_state;
4754
4755         dprintk("%s: begin!\n", __func__);
4756         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4757                 return;
4758         /* Do we need to do an open_to_lock_owner? */
4759         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4760                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4761                         goto out_release_lock_seqid;
4762                 data->arg.open_stateid = &state->stateid;
4763                 data->arg.new_lock_owner = 1;
4764                 data->res.open_seqid = data->arg.open_seqid;
4765         } else
4766                 data->arg.new_lock_owner = 0;
4767         data->timestamp = jiffies;
4768         if (nfs4_setup_sequence(data->server,
4769                                 &data->arg.seq_args,
4770                                 &data->res.seq_res,
4771                                 task) == 0) {
4772                 rpc_call_start(task);
4773                 return;
4774         }
4775         nfs_release_seqid(data->arg.open_seqid);
4776 out_release_lock_seqid:
4777         nfs_release_seqid(data->arg.lock_seqid);
4778         dprintk("%s: done!, ret = %d\n", __func__, task->tk_status);
4779 }
4780
4781 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4782 {
4783         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4784         nfs4_lock_prepare(task, calldata);
4785 }
4786
4787 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4788 {
4789         struct nfs4_lockdata *data = calldata;
4790
4791         dprintk("%s: begin!\n", __func__);
4792
4793         if (!nfs4_sequence_done(task, &data->res.seq_res))
4794                 return;
4795
4796         data->rpc_status = task->tk_status;
4797         if (data->arg.new_lock_owner != 0) {
4798                 if (data->rpc_status == 0)
4799                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4800                 else
4801                         goto out;
4802         }
4803         if (data->rpc_status == 0) {
4804                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4805                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4806                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4807         }
4808 out:
4809         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4810 }
4811
4812 static void nfs4_lock_release(void *calldata)
4813 {
4814         struct nfs4_lockdata *data = calldata;
4815
4816         dprintk("%s: begin!\n", __func__);
4817         nfs_free_seqid(data->arg.open_seqid);
4818         if (data->cancelled != 0) {
4819                 struct rpc_task *task;
4820                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4821                                 data->arg.lock_seqid);
4822                 if (!IS_ERR(task))
4823                         rpc_put_task_async(task);
4824                 dprintk("%s: cancelling lock!\n", __func__);
4825         } else
4826                 nfs_free_seqid(data->arg.lock_seqid);
4827         nfs4_put_lock_state(data->lsp);
4828         put_nfs_open_context(data->ctx);
4829         kfree(data);
4830         dprintk("%s: done!\n", __func__);
4831 }
4832
4833 static const struct rpc_call_ops nfs4_lock_ops = {
4834         .rpc_call_prepare = nfs4_lock_prepare,
4835         .rpc_call_done = nfs4_lock_done,
4836         .rpc_release = nfs4_lock_release,
4837 };
4838
4839 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4840         .rpc_call_prepare = nfs4_recover_lock_prepare,
4841         .rpc_call_done = nfs4_lock_done,
4842         .rpc_release = nfs4_lock_release,
4843 };
4844
4845 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4846 {
4847         switch (error) {
4848         case -NFS4ERR_ADMIN_REVOKED:
4849         case -NFS4ERR_BAD_STATEID:
4850                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4851                 if (new_lock_owner != 0 ||
4852                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4853                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4854                 break;
4855         case -NFS4ERR_STALE_STATEID:
4856                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4857         case -NFS4ERR_EXPIRED:
4858                 nfs4_schedule_lease_recovery(server->nfs_client);
4859         };
4860 }
4861
4862 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4863 {
4864         struct nfs4_lockdata *data;
4865         struct rpc_task *task;
4866         struct rpc_message msg = {
4867                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4868                 .rpc_cred = state->owner->so_cred,
4869         };
4870         struct rpc_task_setup task_setup_data = {
4871                 .rpc_client = NFS_CLIENT(state->inode),
4872                 .rpc_message = &msg,
4873                 .callback_ops = &nfs4_lock_ops,
4874                 .workqueue = nfsiod_workqueue,
4875                 .flags = RPC_TASK_ASYNC,
4876         };
4877         int ret;
4878
4879         dprintk("%s: begin!\n", __func__);
4880         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4881                         fl->fl_u.nfs4_fl.owner,
4882                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4883         if (data == NULL)
4884                 return -ENOMEM;
4885         if (IS_SETLKW(cmd))
4886                 data->arg.block = 1;
4887         if (recovery_type > NFS_LOCK_NEW) {
4888                 if (recovery_type == NFS_LOCK_RECLAIM)
4889                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4890                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4891         }
4892         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4893         msg.rpc_argp = &data->arg;
4894         msg.rpc_resp = &data->res;
4895         task_setup_data.callback_data = data;
4896         task = rpc_run_task(&task_setup_data);
4897         if (IS_ERR(task))
4898                 return PTR_ERR(task);
4899         ret = nfs4_wait_for_completion_rpc_task(task);
4900         if (ret == 0) {
4901                 ret = data->rpc_status;
4902                 if (ret)
4903                         nfs4_handle_setlk_error(data->server, data->lsp,
4904                                         data->arg.new_lock_owner, ret);
4905         } else
4906                 data->cancelled = 1;
4907         rpc_put_task(task);
4908         dprintk("%s: done, ret = %d!\n", __func__, ret);
4909         return ret;
4910 }
4911
4912 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4913 {
4914         struct nfs_server *server = NFS_SERVER(state->inode);
4915         struct nfs4_exception exception = {
4916                 .inode = state->inode,
4917         };
4918         int err;
4919
4920         do {
4921                 /* Cache the lock if possible... */
4922                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4923                         return 0;
4924                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4925                 if (err != -NFS4ERR_DELAY)
4926                         break;
4927                 nfs4_handle_exception(server, err, &exception);
4928         } while (exception.retry);
4929         return err;
4930 }
4931
4932 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4933 {
4934         struct nfs_server *server = NFS_SERVER(state->inode);
4935         struct nfs4_exception exception = {
4936                 .inode = state->inode,
4937         };
4938         int err;
4939
4940         err = nfs4_set_lock_state(state, request);
4941         if (err != 0)
4942                 return err;
4943         do {
4944                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4945                         return 0;
4946                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4947                 switch (err) {
4948                 default:
4949                         goto out;
4950                 case -NFS4ERR_GRACE:
4951                 case -NFS4ERR_DELAY:
4952                         nfs4_handle_exception(server, err, &exception);
4953                         err = 0;
4954                 }
4955         } while (exception.retry);
4956 out:
4957         return err;
4958 }
4959
4960 #if defined(CONFIG_NFS_V4_1)
4961 /**
4962  * nfs41_check_expired_locks - possibly free a lock stateid
4963  *
4964  * @state: NFSv4 state for an inode
4965  *
4966  * Returns NFS_OK if recovery for this stateid is now finished.
4967  * Otherwise a negative NFS4ERR value is returned.
4968  */
4969 static int nfs41_check_expired_locks(struct nfs4_state *state)
4970 {
4971         int status, ret = -NFS4ERR_BAD_STATEID;
4972         struct nfs4_lock_state *lsp;
4973         struct nfs_server *server = NFS_SERVER(state->inode);
4974
4975         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4976                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4977                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4978                         if (status != NFS_OK) {
4979                                 /* Free the stateid unless the server
4980                                  * informs us the stateid is unrecognized. */
4981                                 if (status != -NFS4ERR_BAD_STATEID)
4982                                         nfs41_free_stateid(server,
4983                                                         &lsp->ls_stateid);
4984                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4985                                 ret = status;
4986                         }
4987                 }
4988         };
4989
4990         return ret;
4991 }
4992
4993 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4994 {
4995         int status = NFS_OK;
4996
4997         if (test_bit(LK_STATE_IN_USE, &state->flags))
4998                 status = nfs41_check_expired_locks(state);
4999         if (status != NFS_OK)
5000                 status = nfs4_lock_expired(state, request);
5001         return status;
5002 }
5003 #endif
5004
5005 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5006 {
5007         struct nfs_inode *nfsi = NFS_I(state->inode);
5008         unsigned char fl_flags = request->fl_flags;
5009         int status = -ENOLCK;
5010
5011         if ((fl_flags & FL_POSIX) &&
5012                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5013                 goto out;
5014         /* Is this a delegated open? */
5015         status = nfs4_set_lock_state(state, request);
5016         if (status != 0)
5017                 goto out;
5018         request->fl_flags |= FL_ACCESS;
5019         status = do_vfs_lock(request->fl_file, request);
5020         if (status < 0)
5021                 goto out;
5022         down_read(&nfsi->rwsem);
5023         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5024                 /* Yes: cache locks! */
5025                 /* ...but avoid races with delegation recall... */
5026                 request->fl_flags = fl_flags & ~FL_SLEEP;
5027                 status = do_vfs_lock(request->fl_file, request);
5028                 goto out_unlock;
5029         }
5030         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5031         if (status != 0)
5032                 goto out_unlock;
5033         /* Note: we always want to sleep here! */
5034         request->fl_flags = fl_flags | FL_SLEEP;
5035         if (do_vfs_lock(request->fl_file, request) < 0)
5036                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
5037                         "manager!\n", __func__);
5038 out_unlock:
5039         up_read(&nfsi->rwsem);
5040 out:
5041         request->fl_flags = fl_flags;
5042         return status;
5043 }
5044
5045 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5046 {
5047         struct nfs4_exception exception = {
5048                 .state = state,
5049                 .inode = state->inode,
5050         };
5051         int err;
5052
5053         do {
5054                 err = _nfs4_proc_setlk(state, cmd, request);
5055                 if (err == -NFS4ERR_DENIED)
5056                         err = -EAGAIN;
5057                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5058                                 err, &exception);
5059         } while (exception.retry);
5060         return err;
5061 }
5062
5063 static int
5064 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5065 {
5066         struct nfs_open_context *ctx;
5067         struct nfs4_state *state;
5068         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5069         int status;
5070
5071         /* verify open state */
5072         ctx = nfs_file_open_context(filp);
5073         state = ctx->state;
5074
5075         if (request->fl_start < 0 || request->fl_end < 0)
5076                 return -EINVAL;
5077
5078         if (IS_GETLK(cmd)) {
5079                 if (state != NULL)
5080                         return nfs4_proc_getlk(state, F_GETLK, request);
5081                 return 0;
5082         }
5083
5084         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5085                 return -EINVAL;
5086
5087         if (request->fl_type == F_UNLCK) {
5088                 if (state != NULL)
5089                         return nfs4_proc_unlck(state, cmd, request);
5090                 return 0;
5091         }
5092
5093         if (state == NULL)
5094                 return -ENOLCK;
5095         /*
5096          * Don't rely on the VFS having checked the file open mode,
5097          * since it won't do this for flock() locks.
5098          */
5099         switch (request->fl_type) {
5100         case F_RDLCK:
5101                 if (!(filp->f_mode & FMODE_READ))
5102                         return -EBADF;
5103                 break;
5104         case F_WRLCK:
5105                 if (!(filp->f_mode & FMODE_WRITE))
5106                         return -EBADF;
5107         }
5108
5109         do {
5110                 status = nfs4_proc_setlk(state, cmd, request);
5111                 if ((status != -EAGAIN) || IS_SETLK(cmd))
5112                         break;
5113                 timeout = nfs4_set_lock_task_retry(timeout);
5114                 status = -ERESTARTSYS;
5115                 if (signalled())
5116                         break;
5117         } while(status < 0);
5118         return status;
5119 }
5120
5121 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
5122 {
5123         struct nfs_server *server = NFS_SERVER(state->inode);
5124         struct nfs4_exception exception = { };
5125         int err;
5126
5127         err = nfs4_set_lock_state(state, fl);
5128         if (err != 0)
5129                 goto out;
5130         do {
5131                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
5132                 switch (err) {
5133                         default:
5134                                 printk(KERN_ERR "NFS: %s: unhandled error "
5135                                         "%d.\n", __func__, err);
5136                         case 0:
5137                         case -ESTALE:
5138                                 goto out;
5139                         case -NFS4ERR_EXPIRED:
5140                                 nfs4_schedule_stateid_recovery(server, state);
5141                         case -NFS4ERR_STALE_CLIENTID:
5142                         case -NFS4ERR_STALE_STATEID:
5143                                 nfs4_schedule_lease_recovery(server->nfs_client);
5144                                 goto out;
5145                         case -NFS4ERR_BADSESSION:
5146                         case -NFS4ERR_BADSLOT:
5147                         case -NFS4ERR_BAD_HIGH_SLOT:
5148                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
5149                         case -NFS4ERR_DEADSESSION:
5150                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
5151                                 goto out;
5152                         case -ERESTARTSYS:
5153                                 /*
5154                                  * The show must go on: exit, but mark the
5155                                  * stateid as needing recovery.
5156                                  */
5157                         case -NFS4ERR_DELEG_REVOKED:
5158                         case -NFS4ERR_ADMIN_REVOKED:
5159                         case -NFS4ERR_BAD_STATEID:
5160                         case -NFS4ERR_OPENMODE:
5161                                 nfs4_schedule_stateid_recovery(server, state);
5162                                 err = 0;
5163                                 goto out;
5164                         case -EKEYEXPIRED:
5165                                 /*
5166                                  * User RPCSEC_GSS context has expired.
5167                                  * We cannot recover this stateid now, so
5168                                  * skip it and allow recovery thread to
5169                                  * proceed.
5170                                  */
5171                                 err = 0;
5172                                 goto out;
5173                         case -ENOMEM:
5174                         case -NFS4ERR_DENIED:
5175                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
5176                                 err = 0;
5177                                 goto out;
5178                         case -NFS4ERR_DELAY:
5179                                 break;
5180                 }
5181                 err = nfs4_handle_exception(server, err, &exception);
5182         } while (exception.retry);
5183 out:
5184         return err;
5185 }
5186
5187 struct nfs_release_lockowner_data {
5188         struct nfs4_lock_state *lsp;
5189         struct nfs_server *server;
5190         struct nfs_release_lockowner_args args;
5191 };
5192
5193 static void nfs4_release_lockowner_release(void *calldata)
5194 {
5195         struct nfs_release_lockowner_data *data = calldata;
5196         nfs4_free_lock_state(data->server, data->lsp);
5197         kfree(calldata);
5198 }
5199
5200 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5201         .rpc_release = nfs4_release_lockowner_release,
5202 };
5203
5204 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5205 {
5206         struct nfs_server *server = lsp->ls_state->owner->so_server;
5207         struct nfs_release_lockowner_data *data;
5208         struct rpc_message msg = {
5209                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5210         };
5211
5212         if (server->nfs_client->cl_mvops->minor_version != 0)
5213                 return -EINVAL;
5214         data = kmalloc(sizeof(*data), GFP_NOFS);
5215         if (!data)
5216                 return -ENOMEM;
5217         data->lsp = lsp;
5218         data->server = server;
5219         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5220         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5221         data->args.lock_owner.s_dev = server->s_dev;
5222         msg.rpc_argp = &data->args;
5223         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5224         return 0;
5225 }
5226
5227 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5228
5229 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5230                                    const void *buf, size_t buflen,
5231                                    int flags, int type)
5232 {
5233         if (strcmp(key, "") != 0)
5234                 return -EINVAL;
5235
5236         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5237 }
5238
5239 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5240                                    void *buf, size_t buflen, int type)
5241 {
5242         if (strcmp(key, "") != 0)
5243                 return -EINVAL;
5244
5245         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5246 }
5247
5248 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5249                                        size_t list_len, const char *name,
5250                                        size_t name_len, int type)
5251 {
5252         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5253
5254         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5255                 return 0;
5256
5257         if (list && len <= list_len)
5258                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5259         return len;
5260 }
5261
5262 /*
5263  * nfs_fhget will use either the mounted_on_fileid or the fileid
5264  */
5265 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5266 {
5267         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5268                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5269               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5270               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5271                 return;
5272
5273         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5274                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5275         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5276         fattr->nlink = 2;
5277 }
5278
5279 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5280                                    const struct qstr *name,
5281                                    struct nfs4_fs_locations *fs_locations,
5282                                    struct page *page)
5283 {
5284         struct nfs_server *server = NFS_SERVER(dir);
5285         u32 bitmask[2] = {
5286                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5287         };
5288         struct nfs4_fs_locations_arg args = {
5289                 .dir_fh = NFS_FH(dir),
5290                 .name = name,
5291                 .page = page,
5292                 .bitmask = bitmask,
5293         };
5294         struct nfs4_fs_locations_res res = {
5295                 .fs_locations = fs_locations,
5296         };
5297         struct rpc_message msg = {
5298                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5299                 .rpc_argp = &args,
5300                 .rpc_resp = &res,
5301         };
5302         int status;
5303
5304         dprintk("%s: start\n", __func__);
5305
5306         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5307          * is not supported */
5308         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5309                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5310         else
5311                 bitmask[0] |= FATTR4_WORD0_FILEID;
5312
5313         nfs_fattr_init(&fs_locations->fattr);
5314         fs_locations->server = server;
5315         fs_locations->nlocations = 0;
5316         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5317         dprintk("%s: returned status = %d\n", __func__, status);
5318         return status;
5319 }
5320
5321 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5322                            const struct qstr *name,
5323                            struct nfs4_fs_locations *fs_locations,
5324                            struct page *page)
5325 {
5326         struct nfs4_exception exception = { };
5327         int err;
5328         do {
5329                 err = nfs4_handle_exception(NFS_SERVER(dir),
5330                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5331                                 &exception);
5332         } while (exception.retry);
5333         return err;
5334 }
5335
5336 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5337 {
5338         int status;
5339         struct nfs4_secinfo_arg args = {
5340                 .dir_fh = NFS_FH(dir),
5341                 .name   = name,
5342         };
5343         struct nfs4_secinfo_res res = {
5344                 .flavors     = flavors,
5345         };
5346         struct rpc_message msg = {
5347                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5348                 .rpc_argp = &args,
5349                 .rpc_resp = &res,
5350         };
5351
5352         dprintk("NFS call  secinfo %s\n", name->name);
5353         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5354         dprintk("NFS reply  secinfo: %d\n", status);
5355         return status;
5356 }
5357
5358 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5359                       struct nfs4_secinfo_flavors *flavors)
5360 {
5361         struct nfs4_exception exception = { };
5362         int err;
5363         do {
5364                 err = nfs4_handle_exception(NFS_SERVER(dir),
5365                                 _nfs4_proc_secinfo(dir, name, flavors),
5366                                 &exception);
5367         } while (exception.retry);
5368         return err;
5369 }
5370
5371 #ifdef CONFIG_NFS_V4_1
5372 /*
5373  * Check the exchange flags returned by the server for invalid flags, having
5374  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5375  * DS flags set.
5376  */
5377 static int nfs4_check_cl_exchange_flags(u32 flags)
5378 {
5379         if (flags & ~EXCHGID4_FLAG_MASK_R)
5380                 goto out_inval;
5381         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5382             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5383                 goto out_inval;
5384         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5385                 goto out_inval;
5386         return NFS_OK;
5387 out_inval:
5388         return -NFS4ERR_INVAL;
5389 }
5390
5391 static bool
5392 nfs41_same_server_scope(struct nfs41_server_scope *a,
5393                         struct nfs41_server_scope *b)
5394 {
5395         if (a->server_scope_sz == b->server_scope_sz &&
5396             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5397                 return true;
5398
5399         return false;
5400 }
5401
5402 /*
5403  * nfs4_proc_bind_conn_to_session()
5404  *
5405  * The 4.1 client currently uses the same TCP connection for the
5406  * fore and backchannel.
5407  */
5408 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5409 {
5410         int status;
5411         struct nfs41_bind_conn_to_session_res res;
5412         struct rpc_message msg = {
5413                 .rpc_proc =
5414                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5415                 .rpc_argp = clp,
5416                 .rpc_resp = &res,
5417                 .rpc_cred = cred,
5418         };
5419
5420         dprintk("--> %s\n", __func__);
5421
5422         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5423         if (unlikely(res.session == NULL)) {
5424                 status = -ENOMEM;
5425                 goto out;
5426         }
5427
5428         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5429         if (status == 0) {
5430                 if (memcmp(res.session->sess_id.data,
5431                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5432                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5433                         status = -EIO;
5434                         goto out_session;
5435                 }
5436                 if (res.dir != NFS4_CDFS4_BOTH) {
5437                         dprintk("NFS: %s: Unexpected direction from server\n",
5438                                 __func__);
5439                         status = -EIO;
5440                         goto out_session;
5441                 }
5442                 if (res.use_conn_in_rdma_mode) {
5443                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5444                                 __func__);
5445                         status = -EIO;
5446                         goto out_session;
5447                 }
5448         }
5449 out_session:
5450         kfree(res.session);
5451 out:
5452         dprintk("<-- %s status= %d\n", __func__, status);
5453         return status;
5454 }
5455
5456 /*
5457  * nfs4_proc_exchange_id()
5458  *
5459  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5460  *
5461  * Since the clientid has expired, all compounds using sessions
5462  * associated with the stale clientid will be returning
5463  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5464  * be in some phase of session reset.
5465  */
5466 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5467 {
5468         nfs4_verifier verifier;
5469         struct nfs41_exchange_id_args args = {
5470                 .verifier = &verifier,
5471                 .client = clp,
5472                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5473         };
5474         struct nfs41_exchange_id_res res = {
5475                 0
5476         };
5477         int status;
5478         struct rpc_message msg = {
5479                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5480                 .rpc_argp = &args,
5481                 .rpc_resp = &res,
5482                 .rpc_cred = cred,
5483         };
5484
5485         nfs4_init_boot_verifier(clp, &verifier);
5486         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5487                                                         sizeof(args.id));
5488         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5489                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5490                 args.id_len, args.id);
5491
5492         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5493                                         GFP_NOFS);
5494         if (unlikely(res.server_owner == NULL)) {
5495                 status = -ENOMEM;
5496                 goto out;
5497         }
5498
5499         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5500                                         GFP_NOFS);
5501         if (unlikely(res.server_scope == NULL)) {
5502                 status = -ENOMEM;
5503                 goto out_server_owner;
5504         }
5505
5506         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5507         if (unlikely(res.impl_id == NULL)) {
5508                 status = -ENOMEM;
5509                 goto out_server_scope;
5510         }
5511
5512         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5513         if (status == 0)
5514                 status = nfs4_check_cl_exchange_flags(res.flags);
5515
5516         if (status == 0) {
5517                 clp->cl_clientid = res.clientid;
5518                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5519                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5520                         clp->cl_seqid = res.seqid;
5521
5522                 kfree(clp->cl_serverowner);
5523                 clp->cl_serverowner = res.server_owner;
5524                 res.server_owner = NULL;
5525
5526                 /* use the most recent implementation id */
5527                 kfree(clp->cl_implid);
5528                 clp->cl_implid = res.impl_id;
5529
5530                 if (clp->cl_serverscope != NULL &&
5531                     !nfs41_same_server_scope(clp->cl_serverscope,
5532                                              res.server_scope)) {
5533                         dprintk("%s: server_scope mismatch detected\n",
5534                                 __func__);
5535                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5536                         kfree(clp->cl_serverscope);
5537                         clp->cl_serverscope = NULL;
5538                 }
5539
5540                 if (clp->cl_serverscope == NULL) {
5541                         clp->cl_serverscope = res.server_scope;
5542                         goto out;
5543                 }
5544         } else
5545                 kfree(res.impl_id);
5546
5547 out_server_owner:
5548         kfree(res.server_owner);
5549 out_server_scope:
5550         kfree(res.server_scope);
5551 out:
5552         if (clp->cl_implid != NULL)
5553                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5554                         "domain: %s, name: %s, date: %llu,%u\n",
5555                         clp->cl_implid->domain, clp->cl_implid->name,
5556                         clp->cl_implid->date.seconds,
5557                         clp->cl_implid->date.nseconds);
5558         dprintk("NFS reply exchange_id: %d\n", status);
5559         return status;
5560 }
5561
5562 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5563                 struct rpc_cred *cred)
5564 {
5565         struct rpc_message msg = {
5566                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5567                 .rpc_argp = clp,
5568                 .rpc_cred = cred,
5569         };
5570         int status;
5571
5572         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5573         if (status)
5574                 dprintk("NFS: Got error %d from the server %s on "
5575                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5576         return status;
5577 }
5578
5579 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5580                 struct rpc_cred *cred)
5581 {
5582         unsigned int loop;
5583         int ret;
5584
5585         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5586                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5587                 switch (ret) {
5588                 case -NFS4ERR_DELAY:
5589                 case -NFS4ERR_CLIENTID_BUSY:
5590                         ssleep(1);
5591                         break;
5592                 default:
5593                         return ret;
5594                 }
5595         }
5596         return 0;
5597 }
5598
5599 int nfs4_destroy_clientid(struct nfs_client *clp)
5600 {
5601         struct rpc_cred *cred;
5602         int ret = 0;
5603
5604         if (clp->cl_mvops->minor_version < 1)
5605                 goto out;
5606         if (clp->cl_exchange_flags == 0)
5607                 goto out;
5608         if (clp->cl_preserve_clid)
5609                 goto out;
5610         cred = nfs4_get_exchange_id_cred(clp);
5611         ret = nfs4_proc_destroy_clientid(clp, cred);
5612         if (cred)
5613                 put_rpccred(cred);
5614         switch (ret) {
5615         case 0:
5616         case -NFS4ERR_STALE_CLIENTID:
5617                 clp->cl_exchange_flags = 0;
5618         }
5619 out:
5620         return ret;
5621 }
5622
5623 struct nfs4_get_lease_time_data {
5624         struct nfs4_get_lease_time_args *args;
5625         struct nfs4_get_lease_time_res *res;
5626         struct nfs_client *clp;
5627 };
5628
5629 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5630                                         void *calldata)
5631 {
5632         int ret;
5633         struct nfs4_get_lease_time_data *data =
5634                         (struct nfs4_get_lease_time_data *)calldata;
5635
5636         dprintk("--> %s\n", __func__);
5637         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5638         /* just setup sequence, do not trigger session recovery
5639            since we're invoked within one */
5640         ret = nfs41_setup_sequence(data->clp->cl_session,
5641                                    &data->args->la_seq_args,
5642                                    &data->res->lr_seq_res, task);
5643
5644         if (ret != -EAGAIN)
5645                 rpc_call_start(task);
5646         dprintk("<-- %s\n", __func__);
5647 }
5648
5649 /*
5650  * Called from nfs4_state_manager thread for session setup, so don't recover
5651  * from sequence operation or clientid errors.
5652  */
5653 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5654 {
5655         struct nfs4_get_lease_time_data *data =
5656                         (struct nfs4_get_lease_time_data *)calldata;
5657
5658         dprintk("--> %s\n", __func__);
5659         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5660                 return;
5661         switch (task->tk_status) {
5662         case -NFS4ERR_DELAY:
5663         case -NFS4ERR_GRACE:
5664                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5665                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5666                 task->tk_status = 0;
5667                 /* fall through */
5668         case -NFS4ERR_RETRY_UNCACHED_REP:
5669                 rpc_restart_call_prepare(task);
5670                 return;
5671         }
5672         dprintk("<-- %s\n", __func__);
5673 }
5674
5675 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5676         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5677         .rpc_call_done = nfs4_get_lease_time_done,
5678 };
5679
5680 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5681 {
5682         struct rpc_task *task;
5683         struct nfs4_get_lease_time_args args;
5684         struct nfs4_get_lease_time_res res = {
5685                 .lr_fsinfo = fsinfo,
5686         };
5687         struct nfs4_get_lease_time_data data = {
5688                 .args = &args,
5689                 .res = &res,
5690                 .clp = clp,
5691         };
5692         struct rpc_message msg = {
5693                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5694                 .rpc_argp = &args,
5695                 .rpc_resp = &res,
5696         };
5697         struct rpc_task_setup task_setup = {
5698                 .rpc_client = clp->cl_rpcclient,
5699                 .rpc_message = &msg,
5700                 .callback_ops = &nfs4_get_lease_time_ops,
5701                 .callback_data = &data,
5702                 .flags = RPC_TASK_TIMEOUT,
5703         };
5704         int status;
5705
5706         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5707         dprintk("--> %s\n", __func__);
5708         task = rpc_run_task(&task_setup);
5709
5710         if (IS_ERR(task))
5711                 status = PTR_ERR(task);
5712         else {
5713                 status = task->tk_status;
5714                 rpc_put_task(task);
5715         }
5716         dprintk("<-- %s return %d\n", __func__, status);
5717
5718         return status;
5719 }
5720
5721 struct nfs4_slot *nfs4_alloc_slots(struct nfs4_slot_table *table,
5722                 u32 max_slots, gfp_t gfp_flags)
5723 {
5724         struct nfs4_slot *tbl;
5725         u32 i;
5726
5727         tbl = kmalloc_array(max_slots, sizeof(*tbl), gfp_flags);
5728         if (tbl != NULL) {
5729                 for (i = 0; i < max_slots; i++) {
5730                         tbl[i].table = table;
5731                         tbl[i].slot_nr = i;
5732                 }
5733         }
5734         return tbl;
5735 }
5736
5737 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5738                 struct nfs4_slot *new,
5739                 u32 max_slots,
5740                 u32 ivalue)
5741 {
5742         struct nfs4_slot *old = NULL;
5743         u32 i;
5744
5745         spin_lock(&tbl->slot_tbl_lock);
5746         if (new) {
5747                 old = tbl->slots;
5748                 tbl->slots = new;
5749                 tbl->max_slots = max_slots;
5750         }
5751         tbl->highest_used_slotid = NFS4_NO_SLOT;
5752         tbl->target_highest_slotid = max_slots - 1;
5753         tbl->server_highest_slotid = max_slots - 1;
5754         tbl->max_slotid = max_slots - 1;
5755         for (i = 0; i < tbl->max_slots; i++)
5756                 tbl->slots[i].seq_nr = ivalue;
5757         spin_unlock(&tbl->slot_tbl_lock);
5758         kfree(old);
5759 }
5760
5761 /*
5762  * (re)Initialise a slot table
5763  */
5764 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5765                                  u32 ivalue)
5766 {
5767         struct nfs4_slot *new = NULL;
5768         int ret = -ENOMEM;
5769
5770         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5771                 max_reqs, tbl->max_slots);
5772
5773         /* Does the newly negotiated max_reqs match the existing slot table? */
5774         if (max_reqs != tbl->max_slots) {
5775                 new = nfs4_alloc_slots(tbl, max_reqs, GFP_NOFS);
5776                 if (!new)
5777                         goto out;
5778         }
5779         ret = 0;
5780
5781         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5782         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5783                 tbl, tbl->slots, tbl->max_slots);
5784 out:
5785         dprintk("<-- %s: return %d\n", __func__, ret);
5786         return ret;
5787 }
5788
5789 /* Destroy the slot table */
5790 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5791 {
5792         if (session->fc_slot_table.slots != NULL) {
5793                 kfree(session->fc_slot_table.slots);
5794                 session->fc_slot_table.slots = NULL;
5795         }
5796         if (session->bc_slot_table.slots != NULL) {
5797                 kfree(session->bc_slot_table.slots);
5798                 session->bc_slot_table.slots = NULL;
5799         }
5800         return;
5801 }
5802
5803 /*
5804  * Initialize or reset the forechannel and backchannel tables
5805  */
5806 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5807 {
5808         struct nfs4_slot_table *tbl;
5809         int status;
5810
5811         dprintk("--> %s\n", __func__);
5812         /* Fore channel */
5813         tbl = &ses->fc_slot_table;
5814         tbl->session = ses;
5815         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5816         if (status) /* -ENOMEM */
5817                 return status;
5818         /* Back channel */
5819         tbl = &ses->bc_slot_table;
5820         tbl->session = ses;
5821         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5822         if (status && tbl->slots == NULL)
5823                 /* Fore and back channel share a connection so get
5824                  * both slot tables or neither */
5825                 nfs4_destroy_slot_tables(ses);
5826         return status;
5827 }
5828
5829 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5830 {
5831         struct nfs4_session *session;
5832         struct nfs4_slot_table *tbl;
5833
5834         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5835         if (!session)
5836                 return NULL;
5837
5838         tbl = &session->fc_slot_table;
5839         tbl->highest_used_slotid = NFS4_NO_SLOT;
5840         spin_lock_init(&tbl->slot_tbl_lock);
5841         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5842         init_completion(&tbl->complete);
5843
5844         tbl = &session->bc_slot_table;
5845         tbl->highest_used_slotid = NFS4_NO_SLOT;
5846         spin_lock_init(&tbl->slot_tbl_lock);
5847         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5848         init_completion(&tbl->complete);
5849
5850         session->session_state = 1<<NFS4_SESSION_INITING;
5851
5852         session->clp = clp;
5853         return session;
5854 }
5855
5856 void nfs4_destroy_session(struct nfs4_session *session)
5857 {
5858         struct rpc_xprt *xprt;
5859         struct rpc_cred *cred;
5860
5861         cred = nfs4_get_exchange_id_cred(session->clp);
5862         nfs4_proc_destroy_session(session, cred);
5863         if (cred)
5864                 put_rpccred(cred);
5865
5866         rcu_read_lock();
5867         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5868         rcu_read_unlock();
5869         dprintk("%s Destroy backchannel for xprt %p\n",
5870                 __func__, xprt);
5871         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5872         nfs4_destroy_slot_tables(session);
5873         kfree(session);
5874 }
5875
5876 /*
5877  * Initialize the values to be used by the client in CREATE_SESSION
5878  * If nfs4_init_session set the fore channel request and response sizes,
5879  * use them.
5880  *
5881  * Set the back channel max_resp_sz_cached to zero to force the client to
5882  * always set csa_cachethis to FALSE because the current implementation
5883  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5884  */
5885 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5886 {
5887         struct nfs4_session *session = args->client->cl_session;
5888         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5889                      mxresp_sz = session->fc_target_max_resp_sz;
5890
5891         if (mxrqst_sz == 0)
5892                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5893         if (mxresp_sz == 0)
5894                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5895         /* Fore channel attributes */
5896         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5897         args->fc_attrs.max_resp_sz = mxresp_sz;
5898         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5899         args->fc_attrs.max_reqs = max_session_slots;
5900
5901         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5902                 "max_ops=%u max_reqs=%u\n",
5903                 __func__,
5904                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5905                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5906
5907         /* Back channel attributes */
5908         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5909         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5910         args->bc_attrs.max_resp_sz_cached = 0;
5911         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5912         args->bc_attrs.max_reqs = 1;
5913
5914         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5915                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5916                 __func__,
5917                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5918                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5919                 args->bc_attrs.max_reqs);
5920 }
5921
5922 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5923 {
5924         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5925         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5926
5927         if (rcvd->max_resp_sz > sent->max_resp_sz)
5928                 return -EINVAL;
5929         /*
5930          * Our requested max_ops is the minimum we need; we're not
5931          * prepared to break up compounds into smaller pieces than that.
5932          * So, no point even trying to continue if the server won't
5933          * cooperate:
5934          */
5935         if (rcvd->max_ops < sent->max_ops)
5936                 return -EINVAL;
5937         if (rcvd->max_reqs == 0)
5938                 return -EINVAL;
5939         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5940                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5941         return 0;
5942 }
5943
5944 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5945 {
5946         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5947         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5948
5949         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5950                 return -EINVAL;
5951         if (rcvd->max_resp_sz < sent->max_resp_sz)
5952                 return -EINVAL;
5953         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5954                 return -EINVAL;
5955         /* These would render the backchannel useless: */
5956         if (rcvd->max_ops != sent->max_ops)
5957                 return -EINVAL;
5958         if (rcvd->max_reqs != sent->max_reqs)
5959                 return -EINVAL;
5960         return 0;
5961 }
5962
5963 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5964                                      struct nfs4_session *session)
5965 {
5966         int ret;
5967
5968         ret = nfs4_verify_fore_channel_attrs(args, session);
5969         if (ret)
5970                 return ret;
5971         return nfs4_verify_back_channel_attrs(args, session);
5972 }
5973
5974 static int _nfs4_proc_create_session(struct nfs_client *clp,
5975                 struct rpc_cred *cred)
5976 {
5977         struct nfs4_session *session = clp->cl_session;
5978         struct nfs41_create_session_args args = {
5979                 .client = clp,
5980                 .cb_program = NFS4_CALLBACK,
5981         };
5982         struct nfs41_create_session_res res = {
5983                 .client = clp,
5984         };
5985         struct rpc_message msg = {
5986                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5987                 .rpc_argp = &args,
5988                 .rpc_resp = &res,
5989                 .rpc_cred = cred,
5990         };
5991         int status;
5992
5993         nfs4_init_channel_attrs(&args);
5994         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5995
5996         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5997
5998         if (!status) {
5999                 /* Verify the session's negotiated channel_attrs values */
6000                 status = nfs4_verify_channel_attrs(&args, session);
6001                 /* Increment the clientid slot sequence id */
6002                 clp->cl_seqid++;
6003         }
6004
6005         return status;
6006 }
6007
6008 /*
6009  * Issues a CREATE_SESSION operation to the server.
6010  * It is the responsibility of the caller to verify the session is
6011  * expired before calling this routine.
6012  */
6013 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
6014 {
6015         int status;
6016         unsigned *ptr;
6017         struct nfs4_session *session = clp->cl_session;
6018
6019         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
6020
6021         status = _nfs4_proc_create_session(clp, cred);
6022         if (status)
6023                 goto out;
6024
6025         /* Init or reset the session slot tables */
6026         status = nfs4_setup_session_slot_tables(session);
6027         dprintk("slot table setup returned %d\n", status);
6028         if (status)
6029                 goto out;
6030
6031         ptr = (unsigned *)&session->sess_id.data[0];
6032         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
6033                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
6034 out:
6035         dprintk("<-- %s\n", __func__);
6036         return status;
6037 }
6038
6039 /*
6040  * Issue the over-the-wire RPC DESTROY_SESSION.
6041  * The caller must serialize access to this routine.
6042  */
6043 int nfs4_proc_destroy_session(struct nfs4_session *session,
6044                 struct rpc_cred *cred)
6045 {
6046         struct rpc_message msg = {
6047                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
6048                 .rpc_argp = session,
6049                 .rpc_cred = cred,
6050         };
6051         int status = 0;
6052
6053         dprintk("--> nfs4_proc_destroy_session\n");
6054
6055         /* session is still being setup */
6056         if (session->clp->cl_cons_state != NFS_CS_READY)
6057                 return status;
6058
6059         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6060
6061         if (status)
6062                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
6063                         "Session has been destroyed regardless...\n", status);
6064
6065         dprintk("<-- nfs4_proc_destroy_session\n");
6066         return status;
6067 }
6068
6069 /*
6070  * With sessions, the client is not marked ready until after a
6071  * successful EXCHANGE_ID and CREATE_SESSION.
6072  *
6073  * Map errors cl_cons_state errors to EPROTONOSUPPORT to indicate
6074  * other versions of NFS can be tried.
6075  */
6076 static int nfs41_check_session_ready(struct nfs_client *clp)
6077 {
6078         int ret;
6079
6080         if (clp->cl_cons_state == NFS_CS_SESSION_INITING) {
6081                 ret = nfs4_client_recover_expired_lease(clp);
6082                 if (ret)
6083                         return ret;
6084         }
6085         if (clp->cl_cons_state < NFS_CS_READY)
6086                 return -EPROTONOSUPPORT;
6087         smp_rmb();
6088         return 0;
6089 }
6090
6091 int nfs4_init_session(struct nfs_server *server)
6092 {
6093         struct nfs_client *clp = server->nfs_client;
6094         struct nfs4_session *session;
6095         unsigned int target_max_rqst_sz = NFS_MAX_FILE_IO_SIZE;
6096         unsigned int target_max_resp_sz = NFS_MAX_FILE_IO_SIZE;
6097
6098         if (!nfs4_has_session(clp))
6099                 return 0;
6100
6101         if (server->rsize != 0)
6102                 target_max_resp_sz = server->rsize;
6103         target_max_resp_sz += nfs41_maxread_overhead;
6104
6105         if (server->wsize != 0)
6106                 target_max_rqst_sz = server->wsize;
6107         target_max_rqst_sz += nfs41_maxwrite_overhead;
6108
6109         session = clp->cl_session;
6110         spin_lock(&clp->cl_lock);
6111         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
6112                 /* Initialise targets and channel attributes */
6113                 session->fc_target_max_rqst_sz = target_max_rqst_sz;
6114                 session->fc_attrs.max_rqst_sz = target_max_rqst_sz;
6115                 session->fc_target_max_resp_sz = target_max_resp_sz;
6116                 session->fc_attrs.max_resp_sz = target_max_resp_sz;
6117         } else {
6118                 /* Just adjust the targets */
6119                 if (target_max_rqst_sz > session->fc_target_max_rqst_sz) {
6120                         session->fc_target_max_rqst_sz = target_max_rqst_sz;
6121                         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
6122                 }
6123                 if (target_max_resp_sz > session->fc_target_max_resp_sz) {
6124                         session->fc_target_max_resp_sz = target_max_resp_sz;
6125                         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
6126                 }
6127         }
6128         spin_unlock(&clp->cl_lock);
6129
6130         if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
6131                 nfs4_schedule_lease_recovery(clp);
6132
6133         return nfs41_check_session_ready(clp);
6134 }
6135
6136 int nfs4_init_ds_session(struct nfs_client *clp, unsigned long lease_time)
6137 {
6138         struct nfs4_session *session = clp->cl_session;
6139         int ret;
6140
6141         spin_lock(&clp->cl_lock);
6142         if (test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state)) {
6143                 /*
6144                  * Do not set NFS_CS_CHECK_LEASE_TIME instead set the
6145                  * DS lease to be equal to the MDS lease.
6146                  */
6147                 clp->cl_lease_time = lease_time;
6148                 clp->cl_last_renewal = jiffies;
6149         }
6150         spin_unlock(&clp->cl_lock);
6151
6152         ret = nfs41_check_session_ready(clp);
6153         if (ret)
6154                 return ret;
6155         /* Test for the DS role */
6156         if (!is_ds_client(clp))
6157                 return -ENODEV;
6158         return 0;
6159 }
6160 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
6161
6162
6163 /*
6164  * Renew the cl_session lease.
6165  */
6166 struct nfs4_sequence_data {
6167         struct nfs_client *clp;
6168         struct nfs4_sequence_args args;
6169         struct nfs4_sequence_res res;
6170 };
6171
6172 static void nfs41_sequence_release(void *data)
6173 {
6174         struct nfs4_sequence_data *calldata = data;
6175         struct nfs_client *clp = calldata->clp;
6176
6177         if (atomic_read(&clp->cl_count) > 1)
6178                 nfs4_schedule_state_renewal(clp);
6179         nfs_put_client(clp);
6180         kfree(calldata);
6181 }
6182
6183 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6184 {
6185         switch(task->tk_status) {
6186         case -NFS4ERR_DELAY:
6187                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6188                 return -EAGAIN;
6189         default:
6190                 nfs4_schedule_lease_recovery(clp);
6191         }
6192         return 0;
6193 }
6194
6195 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
6196 {
6197         struct nfs4_sequence_data *calldata = data;
6198         struct nfs_client *clp = calldata->clp;
6199
6200         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
6201                 return;
6202
6203         if (task->tk_status < 0) {
6204                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
6205                 if (atomic_read(&clp->cl_count) == 1)
6206                         goto out;
6207
6208                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
6209                         rpc_restart_call_prepare(task);
6210                         return;
6211                 }
6212         }
6213         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
6214 out:
6215         dprintk("<-- %s\n", __func__);
6216 }
6217
6218 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
6219 {
6220         struct nfs4_sequence_data *calldata = data;
6221         struct nfs_client *clp = calldata->clp;
6222         struct nfs4_sequence_args *args;
6223         struct nfs4_sequence_res *res;
6224
6225         args = task->tk_msg.rpc_argp;
6226         res = task->tk_msg.rpc_resp;
6227
6228         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
6229                 return;
6230         rpc_call_start(task);
6231 }
6232
6233 static void nfs41_sequence_prepare_privileged(struct rpc_task *task, void *data)
6234 {
6235         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
6236         nfs41_sequence_prepare(task, data);
6237 }
6238
6239 static const struct rpc_call_ops nfs41_sequence_ops = {
6240         .rpc_call_done = nfs41_sequence_call_done,
6241         .rpc_call_prepare = nfs41_sequence_prepare,
6242         .rpc_release = nfs41_sequence_release,
6243 };
6244
6245 static const struct rpc_call_ops nfs41_sequence_privileged_ops = {
6246         .rpc_call_done = nfs41_sequence_call_done,
6247         .rpc_call_prepare = nfs41_sequence_prepare_privileged,
6248         .rpc_release = nfs41_sequence_release,
6249 };
6250
6251 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred,
6252                                              const struct rpc_call_ops *seq_ops)
6253 {
6254         struct nfs4_sequence_data *calldata;
6255         struct rpc_message msg = {
6256                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
6257                 .rpc_cred = cred,
6258         };
6259         struct rpc_task_setup task_setup_data = {
6260                 .rpc_client = clp->cl_rpcclient,
6261                 .rpc_message = &msg,
6262                 .callback_ops = seq_ops,
6263                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
6264         };
6265
6266         if (!atomic_inc_not_zero(&clp->cl_count))
6267                 return ERR_PTR(-EIO);
6268         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6269         if (calldata == NULL) {
6270                 nfs_put_client(clp);
6271                 return ERR_PTR(-ENOMEM);
6272         }
6273         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
6274         msg.rpc_argp = &calldata->args;
6275         msg.rpc_resp = &calldata->res;
6276         calldata->clp = clp;
6277         task_setup_data.callback_data = calldata;
6278
6279         return rpc_run_task(&task_setup_data);
6280 }
6281
6282 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
6283 {
6284         struct rpc_task *task;
6285         int ret = 0;
6286
6287         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
6288                 return 0;
6289         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_ops);
6290         if (IS_ERR(task))
6291                 ret = PTR_ERR(task);
6292         else
6293                 rpc_put_task_async(task);
6294         dprintk("<-- %s status=%d\n", __func__, ret);
6295         return ret;
6296 }
6297
6298 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
6299 {
6300         struct rpc_task *task;
6301         int ret;
6302
6303         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_privileged_ops);
6304         if (IS_ERR(task)) {
6305                 ret = PTR_ERR(task);
6306                 goto out;
6307         }
6308         ret = rpc_wait_for_completion_task(task);
6309         if (!ret) {
6310                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
6311
6312                 if (task->tk_status == 0)
6313                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
6314                 ret = task->tk_status;
6315         }
6316         rpc_put_task(task);
6317 out:
6318         dprintk("<-- %s status=%d\n", __func__, ret);
6319         return ret;
6320 }
6321
6322 struct nfs4_reclaim_complete_data {
6323         struct nfs_client *clp;
6324         struct nfs41_reclaim_complete_args arg;
6325         struct nfs41_reclaim_complete_res res;
6326 };
6327
6328 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
6329 {
6330         struct nfs4_reclaim_complete_data *calldata = data;
6331
6332         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
6333         if (nfs41_setup_sequence(calldata->clp->cl_session,
6334                                 &calldata->arg.seq_args,
6335                                 &calldata->res.seq_res, task))
6336                 return;
6337
6338         rpc_call_start(task);
6339 }
6340
6341 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
6342 {
6343         switch(task->tk_status) {
6344         case 0:
6345         case -NFS4ERR_COMPLETE_ALREADY:
6346         case -NFS4ERR_WRONG_CRED: /* What to do here? */
6347                 break;
6348         case -NFS4ERR_DELAY:
6349                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
6350                 /* fall through */
6351         case -NFS4ERR_RETRY_UNCACHED_REP:
6352                 return -EAGAIN;
6353         default:
6354                 nfs4_schedule_lease_recovery(clp);
6355         }
6356         return 0;
6357 }
6358
6359 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
6360 {
6361         struct nfs4_reclaim_complete_data *calldata = data;
6362         struct nfs_client *clp = calldata->clp;
6363         struct nfs4_sequence_res *res = &calldata->res.seq_res;
6364
6365         dprintk("--> %s\n", __func__);
6366         if (!nfs41_sequence_done(task, res))
6367                 return;
6368
6369         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
6370                 rpc_restart_call_prepare(task);
6371                 return;
6372         }
6373         dprintk("<-- %s\n", __func__);
6374 }
6375
6376 static void nfs4_free_reclaim_complete_data(void *data)
6377 {
6378         struct nfs4_reclaim_complete_data *calldata = data;
6379
6380         kfree(calldata);
6381 }
6382
6383 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
6384         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
6385         .rpc_call_done = nfs4_reclaim_complete_done,
6386         .rpc_release = nfs4_free_reclaim_complete_data,
6387 };
6388
6389 /*
6390  * Issue a global reclaim complete.
6391  */
6392 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
6393 {
6394         struct nfs4_reclaim_complete_data *calldata;
6395         struct rpc_task *task;
6396         struct rpc_message msg = {
6397                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
6398         };
6399         struct rpc_task_setup task_setup_data = {
6400                 .rpc_client = clp->cl_rpcclient,
6401                 .rpc_message = &msg,
6402                 .callback_ops = &nfs4_reclaim_complete_call_ops,
6403                 .flags = RPC_TASK_ASYNC,
6404         };
6405         int status = -ENOMEM;
6406
6407         dprintk("--> %s\n", __func__);
6408         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
6409         if (calldata == NULL)
6410                 goto out;
6411         calldata->clp = clp;
6412         calldata->arg.one_fs = 0;
6413
6414         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
6415         msg.rpc_argp = &calldata->arg;
6416         msg.rpc_resp = &calldata->res;
6417         task_setup_data.callback_data = calldata;
6418         task = rpc_run_task(&task_setup_data);
6419         if (IS_ERR(task)) {
6420                 status = PTR_ERR(task);
6421                 goto out;
6422         }
6423         status = nfs4_wait_for_completion_rpc_task(task);
6424         if (status == 0)
6425                 status = task->tk_status;
6426         rpc_put_task(task);
6427         return 0;
6428 out:
6429         dprintk("<-- %s status=%d\n", __func__, status);
6430         return status;
6431 }
6432
6433 static void
6434 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6435 {
6436         struct nfs4_layoutget *lgp = calldata;
6437         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6438
6439         dprintk("--> %s\n", __func__);
6440         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6441          * right now covering the LAYOUTGET we are about to send.
6442          * However, that is not so catastrophic, and there seems
6443          * to be no way to prevent it completely.
6444          */
6445         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6446                                 &lgp->res.seq_res, task))
6447                 return;
6448         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6449                                           NFS_I(lgp->args.inode)->layout,
6450                                           lgp->args.ctx->state)) {
6451                 rpc_exit(task, NFS4_OK);
6452                 return;
6453         }
6454         rpc_call_start(task);
6455 }
6456
6457 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6458 {
6459         struct nfs4_layoutget *lgp = calldata;
6460         struct inode *inode = lgp->args.inode;
6461         struct nfs_server *server = NFS_SERVER(inode);
6462         struct pnfs_layout_hdr *lo;
6463         struct nfs4_state *state = NULL;
6464
6465         dprintk("--> %s\n", __func__);
6466
6467         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6468                 goto out;
6469
6470         switch (task->tk_status) {
6471         case 0:
6472                 goto out;
6473         case -NFS4ERR_LAYOUTTRYLATER:
6474         case -NFS4ERR_RECALLCONFLICT:
6475                 task->tk_status = -NFS4ERR_DELAY;
6476                 break;
6477         case -NFS4ERR_EXPIRED:
6478         case -NFS4ERR_BAD_STATEID:
6479                 spin_lock(&inode->i_lock);
6480                 lo = NFS_I(inode)->layout;
6481                 if (!lo || list_empty(&lo->plh_segs)) {
6482                         spin_unlock(&inode->i_lock);
6483                         /* If the open stateid was bad, then recover it. */
6484                         state = lgp->args.ctx->state;
6485                 } else {
6486                         LIST_HEAD(head);
6487
6488                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6489                         spin_unlock(&inode->i_lock);
6490                         /* Mark the bad layout state as invalid, then
6491                          * retry using the open stateid. */
6492                         pnfs_free_lseg_list(&head);
6493                 }
6494         }
6495         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6496                 rpc_restart_call_prepare(task);
6497 out:
6498         dprintk("<-- %s\n", __func__);
6499 }
6500
6501 static size_t max_response_pages(struct nfs_server *server)
6502 {
6503         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6504         return nfs_page_array_len(0, max_resp_sz);
6505 }
6506
6507 static void nfs4_free_pages(struct page **pages, size_t size)
6508 {
6509         int i;
6510
6511         if (!pages)
6512                 return;
6513
6514         for (i = 0; i < size; i++) {
6515                 if (!pages[i])
6516                         break;
6517                 __free_page(pages[i]);
6518         }
6519         kfree(pages);
6520 }
6521
6522 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6523 {
6524         struct page **pages;
6525         int i;
6526
6527         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6528         if (!pages) {
6529                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6530                 return NULL;
6531         }
6532
6533         for (i = 0; i < size; i++) {
6534                 pages[i] = alloc_page(gfp_flags);
6535                 if (!pages[i]) {
6536                         dprintk("%s: failed to allocate page\n", __func__);
6537                         nfs4_free_pages(pages, size);
6538                         return NULL;
6539                 }
6540         }
6541
6542         return pages;
6543 }
6544
6545 static void nfs4_layoutget_release(void *calldata)
6546 {
6547         struct nfs4_layoutget *lgp = calldata;
6548         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6549         size_t max_pages = max_response_pages(server);
6550
6551         dprintk("--> %s\n", __func__);
6552         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6553         put_nfs_open_context(lgp->args.ctx);
6554         kfree(calldata);
6555         dprintk("<-- %s\n", __func__);
6556 }
6557
6558 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6559         .rpc_call_prepare = nfs4_layoutget_prepare,
6560         .rpc_call_done = nfs4_layoutget_done,
6561         .rpc_release = nfs4_layoutget_release,
6562 };
6563
6564 struct pnfs_layout_segment *
6565 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6566 {
6567         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6568         size_t max_pages = max_response_pages(server);
6569         struct rpc_task *task;
6570         struct rpc_message msg = {
6571                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6572                 .rpc_argp = &lgp->args,
6573                 .rpc_resp = &lgp->res,
6574         };
6575         struct rpc_task_setup task_setup_data = {
6576                 .rpc_client = server->client,
6577                 .rpc_message = &msg,
6578                 .callback_ops = &nfs4_layoutget_call_ops,
6579                 .callback_data = lgp,
6580                 .flags = RPC_TASK_ASYNC,
6581         };
6582         struct pnfs_layout_segment *lseg = NULL;
6583         int status = 0;
6584
6585         dprintk("--> %s\n", __func__);
6586
6587         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6588         if (!lgp->args.layout.pages) {
6589                 nfs4_layoutget_release(lgp);
6590                 return ERR_PTR(-ENOMEM);
6591         }
6592         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6593
6594         lgp->res.layoutp = &lgp->args.layout;
6595         lgp->res.seq_res.sr_slot = NULL;
6596         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6597         task = rpc_run_task(&task_setup_data);
6598         if (IS_ERR(task))
6599                 return ERR_CAST(task);
6600         status = nfs4_wait_for_completion_rpc_task(task);
6601         if (status == 0)
6602                 status = task->tk_status;
6603         if (status == 0)
6604                 lseg = pnfs_layout_process(lgp);
6605         rpc_put_task(task);
6606         dprintk("<-- %s status=%d\n", __func__, status);
6607         if (status)
6608                 return ERR_PTR(status);
6609         return lseg;
6610 }
6611
6612 static void
6613 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6614 {
6615         struct nfs4_layoutreturn *lrp = calldata;
6616
6617         dprintk("--> %s\n", __func__);
6618         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6619                                 &lrp->res.seq_res, task))
6620                 return;
6621         rpc_call_start(task);
6622 }
6623
6624 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6625 {
6626         struct nfs4_layoutreturn *lrp = calldata;
6627         struct nfs_server *server;
6628
6629         dprintk("--> %s\n", __func__);
6630
6631         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6632                 return;
6633
6634         server = NFS_SERVER(lrp->args.inode);
6635         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6636                 rpc_restart_call_prepare(task);
6637                 return;
6638         }
6639         dprintk("<-- %s\n", __func__);
6640 }
6641
6642 static void nfs4_layoutreturn_release(void *calldata)
6643 {
6644         struct nfs4_layoutreturn *lrp = calldata;
6645         struct pnfs_layout_hdr *lo = lrp->args.layout;
6646
6647         dprintk("--> %s\n", __func__);
6648         spin_lock(&lo->plh_inode->i_lock);
6649         if (lrp->res.lrs_present)
6650                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6651         lo->plh_block_lgets--;
6652         spin_unlock(&lo->plh_inode->i_lock);
6653         pnfs_put_layout_hdr(lrp->args.layout);
6654         kfree(calldata);
6655         dprintk("<-- %s\n", __func__);
6656 }
6657
6658 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6659         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6660         .rpc_call_done = nfs4_layoutreturn_done,
6661         .rpc_release = nfs4_layoutreturn_release,
6662 };
6663
6664 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6665 {
6666         struct rpc_task *task;
6667         struct rpc_message msg = {
6668                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6669                 .rpc_argp = &lrp->args,
6670                 .rpc_resp = &lrp->res,
6671         };
6672         struct rpc_task_setup task_setup_data = {
6673                 .rpc_client = lrp->clp->cl_rpcclient,
6674                 .rpc_message = &msg,
6675                 .callback_ops = &nfs4_layoutreturn_call_ops,
6676                 .callback_data = lrp,
6677         };
6678         int status;
6679
6680         dprintk("--> %s\n", __func__);
6681         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6682         task = rpc_run_task(&task_setup_data);
6683         if (IS_ERR(task))
6684                 return PTR_ERR(task);
6685         status = task->tk_status;
6686         dprintk("<-- %s status=%d\n", __func__, status);
6687         rpc_put_task(task);
6688         return status;
6689 }
6690
6691 /*
6692  * Retrieve the list of Data Server devices from the MDS.
6693  */
6694 static int _nfs4_getdevicelist(struct nfs_server *server,
6695                                     const struct nfs_fh *fh,
6696                                     struct pnfs_devicelist *devlist)
6697 {
6698         struct nfs4_getdevicelist_args args = {
6699                 .fh = fh,
6700                 .layoutclass = server->pnfs_curr_ld->id,
6701         };
6702         struct nfs4_getdevicelist_res res = {
6703                 .devlist = devlist,
6704         };
6705         struct rpc_message msg = {
6706                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6707                 .rpc_argp = &args,
6708                 .rpc_resp = &res,
6709         };
6710         int status;
6711
6712         dprintk("--> %s\n", __func__);
6713         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6714                                 &res.seq_res, 0);
6715         dprintk("<-- %s status=%d\n", __func__, status);
6716         return status;
6717 }
6718
6719 int nfs4_proc_getdevicelist(struct nfs_server *server,
6720                             const struct nfs_fh *fh,
6721                             struct pnfs_devicelist *devlist)
6722 {
6723         struct nfs4_exception exception = { };
6724         int err;
6725
6726         do {
6727                 err = nfs4_handle_exception(server,
6728                                 _nfs4_getdevicelist(server, fh, devlist),
6729                                 &exception);
6730         } while (exception.retry);
6731
6732         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6733                 err, devlist->num_devs);
6734
6735         return err;
6736 }
6737 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6738
6739 static int
6740 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6741 {
6742         struct nfs4_getdeviceinfo_args args = {
6743                 .pdev = pdev,
6744         };
6745         struct nfs4_getdeviceinfo_res res = {
6746                 .pdev = pdev,
6747         };
6748         struct rpc_message msg = {
6749                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6750                 .rpc_argp = &args,
6751                 .rpc_resp = &res,
6752         };
6753         int status;
6754
6755         dprintk("--> %s\n", __func__);
6756         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6757         dprintk("<-- %s status=%d\n", __func__, status);
6758
6759         return status;
6760 }
6761
6762 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6763 {
6764         struct nfs4_exception exception = { };
6765         int err;
6766
6767         do {
6768                 err = nfs4_handle_exception(server,
6769                                         _nfs4_proc_getdeviceinfo(server, pdev),
6770                                         &exception);
6771         } while (exception.retry);
6772         return err;
6773 }
6774 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6775
6776 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6777 {
6778         struct nfs4_layoutcommit_data *data = calldata;
6779         struct nfs_server *server = NFS_SERVER(data->args.inode);
6780
6781         if (nfs4_setup_sequence(server, &data->args.seq_args,
6782                                 &data->res.seq_res, task))
6783                 return;
6784         rpc_call_start(task);
6785 }
6786
6787 static void
6788 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6789 {
6790         struct nfs4_layoutcommit_data *data = calldata;
6791         struct nfs_server *server = NFS_SERVER(data->args.inode);
6792
6793         if (!nfs4_sequence_done(task, &data->res.seq_res))
6794                 return;
6795
6796         switch (task->tk_status) { /* Just ignore these failures */
6797         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6798         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6799         case -NFS4ERR_BADLAYOUT:     /* no layout */
6800         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6801                 task->tk_status = 0;
6802                 break;
6803         case 0:
6804                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6805                                                    data->res.fattr);
6806                 break;
6807         default:
6808                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6809                         rpc_restart_call_prepare(task);
6810                         return;
6811                 }
6812         }
6813 }
6814
6815 static void nfs4_layoutcommit_release(void *calldata)
6816 {
6817         struct nfs4_layoutcommit_data *data = calldata;
6818         struct pnfs_layout_segment *lseg, *tmp;
6819         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6820
6821         pnfs_cleanup_layoutcommit(data);
6822         /* Matched by references in pnfs_set_layoutcommit */
6823         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6824                 list_del_init(&lseg->pls_lc_list);
6825                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6826                                        &lseg->pls_flags))
6827                         pnfs_put_lseg(lseg);
6828         }
6829
6830         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6831         smp_mb__after_clear_bit();
6832         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6833
6834         put_rpccred(data->cred);
6835         kfree(data);
6836 }
6837
6838 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6839         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6840         .rpc_call_done = nfs4_layoutcommit_done,
6841         .rpc_release = nfs4_layoutcommit_release,
6842 };
6843
6844 int
6845 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6846 {
6847         struct rpc_message msg = {
6848                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6849                 .rpc_argp = &data->args,
6850                 .rpc_resp = &data->res,
6851                 .rpc_cred = data->cred,
6852         };
6853         struct rpc_task_setup task_setup_data = {
6854                 .task = &data->task,
6855                 .rpc_client = NFS_CLIENT(data->args.inode),
6856                 .rpc_message = &msg,
6857                 .callback_ops = &nfs4_layoutcommit_ops,
6858                 .callback_data = data,
6859                 .flags = RPC_TASK_ASYNC,
6860         };
6861         struct rpc_task *task;
6862         int status = 0;
6863
6864         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6865                 "lbw: %llu inode %lu\n",
6866                 data->task.tk_pid, sync,
6867                 data->args.lastbytewritten,
6868                 data->args.inode->i_ino);
6869
6870         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6871         task = rpc_run_task(&task_setup_data);
6872         if (IS_ERR(task))
6873                 return PTR_ERR(task);
6874         if (sync == false)
6875                 goto out;
6876         status = nfs4_wait_for_completion_rpc_task(task);
6877         if (status != 0)
6878                 goto out;
6879         status = task->tk_status;
6880 out:
6881         dprintk("%s: status %d\n", __func__, status);
6882         rpc_put_task(task);
6883         return status;
6884 }
6885
6886 static int
6887 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6888                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6889 {
6890         struct nfs41_secinfo_no_name_args args = {
6891                 .style = SECINFO_STYLE_CURRENT_FH,
6892         };
6893         struct nfs4_secinfo_res res = {
6894                 .flavors = flavors,
6895         };
6896         struct rpc_message msg = {
6897                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6898                 .rpc_argp = &args,
6899                 .rpc_resp = &res,
6900         };
6901         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6902 }
6903
6904 static int
6905 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6906                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6907 {
6908         struct nfs4_exception exception = { };
6909         int err;
6910         do {
6911                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6912                 switch (err) {
6913                 case 0:
6914                 case -NFS4ERR_WRONGSEC:
6915                 case -NFS4ERR_NOTSUPP:
6916                         goto out;
6917                 default:
6918                         err = nfs4_handle_exception(server, err, &exception);
6919                 }
6920         } while (exception.retry);
6921 out:
6922         return err;
6923 }
6924
6925 static int
6926 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6927                     struct nfs_fsinfo *info)
6928 {
6929         int err;
6930         struct page *page;
6931         rpc_authflavor_t flavor;
6932         struct nfs4_secinfo_flavors *flavors;
6933
6934         page = alloc_page(GFP_KERNEL);
6935         if (!page) {
6936                 err = -ENOMEM;
6937                 goto out;
6938         }
6939
6940         flavors = page_address(page);
6941         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6942
6943         /*
6944          * Fall back on "guess and check" method if
6945          * the server doesn't support SECINFO_NO_NAME
6946          */
6947         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6948                 err = nfs4_find_root_sec(server, fhandle, info);
6949                 goto out_freepage;
6950         }
6951         if (err)
6952                 goto out_freepage;
6953
6954         flavor = nfs_find_best_sec(flavors);
6955         if (err == 0)
6956                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6957
6958 out_freepage:
6959         put_page(page);
6960         if (err == -EACCES)
6961                 return -EPERM;
6962 out:
6963         return err;
6964 }
6965
6966 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6967 {
6968         int status;
6969         struct nfs41_test_stateid_args args = {
6970                 .stateid = stateid,
6971         };
6972         struct nfs41_test_stateid_res res;
6973         struct rpc_message msg = {
6974                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6975                 .rpc_argp = &args,
6976                 .rpc_resp = &res,
6977         };
6978
6979         dprintk("NFS call  test_stateid %p\n", stateid);
6980         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6981         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6982         if (status != NFS_OK) {
6983                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6984                 return status;
6985         }
6986         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6987         return -res.status;
6988 }
6989
6990 /**
6991  * nfs41_test_stateid - perform a TEST_STATEID operation
6992  *
6993  * @server: server / transport on which to perform the operation
6994  * @stateid: state ID to test
6995  *
6996  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6997  * Otherwise a negative NFS4ERR value is returned if the operation
6998  * failed or the state ID is not currently valid.
6999  */
7000 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
7001 {
7002         struct nfs4_exception exception = { };
7003         int err;
7004         do {
7005                 err = _nfs41_test_stateid(server, stateid);
7006                 if (err != -NFS4ERR_DELAY)
7007                         break;
7008                 nfs4_handle_exception(server, err, &exception);
7009         } while (exception.retry);
7010         return err;
7011 }
7012
7013 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
7014 {
7015         struct nfs41_free_stateid_args args = {
7016                 .stateid = stateid,
7017         };
7018         struct nfs41_free_stateid_res res;
7019         struct rpc_message msg = {
7020                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
7021                 .rpc_argp = &args,
7022                 .rpc_resp = &res,
7023         };
7024         int status;
7025
7026         dprintk("NFS call  free_stateid %p\n", stateid);
7027         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
7028         status = nfs4_call_sync_sequence(server->client, server, &msg,
7029                                          &args.seq_args, &res.seq_res, 1);
7030         dprintk("NFS reply free_stateid: %d\n", status);
7031         return status;
7032 }
7033
7034 /**
7035  * nfs41_free_stateid - perform a FREE_STATEID operation
7036  *
7037  * @server: server / transport on which to perform the operation
7038  * @stateid: state ID to release
7039  *
7040  * Returns NFS_OK if the server freed "stateid".  Otherwise a
7041  * negative NFS4ERR value is returned.
7042  */
7043 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
7044 {
7045         struct nfs4_exception exception = { };
7046         int err;
7047         do {
7048                 err = _nfs4_free_stateid(server, stateid);
7049                 if (err != -NFS4ERR_DELAY)
7050                         break;
7051                 nfs4_handle_exception(server, err, &exception);
7052         } while (exception.retry);
7053         return err;
7054 }
7055
7056 static bool nfs41_match_stateid(const nfs4_stateid *s1,
7057                 const nfs4_stateid *s2)
7058 {
7059         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
7060                 return false;
7061
7062         if (s1->seqid == s2->seqid)
7063                 return true;
7064         if (s1->seqid == 0 || s2->seqid == 0)
7065                 return true;
7066
7067         return false;
7068 }
7069
7070 #endif /* CONFIG_NFS_V4_1 */
7071
7072 static bool nfs4_match_stateid(const nfs4_stateid *s1,
7073                 const nfs4_stateid *s2)
7074 {
7075         return nfs4_stateid_match(s1, s2);
7076 }
7077
7078
7079 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
7080         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7081         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7082         .recover_open   = nfs4_open_reclaim,
7083         .recover_lock   = nfs4_lock_reclaim,
7084         .establish_clid = nfs4_init_clientid,
7085         .get_clid_cred  = nfs4_get_setclientid_cred,
7086         .detect_trunking = nfs40_discover_server_trunking,
7087 };
7088
7089 #if defined(CONFIG_NFS_V4_1)
7090 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
7091         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
7092         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
7093         .recover_open   = nfs4_open_reclaim,
7094         .recover_lock   = nfs4_lock_reclaim,
7095         .establish_clid = nfs41_init_clientid,
7096         .get_clid_cred  = nfs4_get_exchange_id_cred,
7097         .reclaim_complete = nfs41_proc_reclaim_complete,
7098         .detect_trunking = nfs41_discover_server_trunking,
7099 };
7100 #endif /* CONFIG_NFS_V4_1 */
7101
7102 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
7103         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7104         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7105         .recover_open   = nfs4_open_expired,
7106         .recover_lock   = nfs4_lock_expired,
7107         .establish_clid = nfs4_init_clientid,
7108         .get_clid_cred  = nfs4_get_setclientid_cred,
7109 };
7110
7111 #if defined(CONFIG_NFS_V4_1)
7112 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
7113         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
7114         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
7115         .recover_open   = nfs41_open_expired,
7116         .recover_lock   = nfs41_lock_expired,
7117         .establish_clid = nfs41_init_clientid,
7118         .get_clid_cred  = nfs4_get_exchange_id_cred,
7119 };
7120 #endif /* CONFIG_NFS_V4_1 */
7121
7122 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
7123         .sched_state_renewal = nfs4_proc_async_renew,
7124         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
7125         .renew_lease = nfs4_proc_renew,
7126 };
7127
7128 #if defined(CONFIG_NFS_V4_1)
7129 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
7130         .sched_state_renewal = nfs41_proc_async_sequence,
7131         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
7132         .renew_lease = nfs4_proc_sequence,
7133 };
7134 #endif
7135
7136 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
7137         .minor_version = 0,
7138         .call_sync = _nfs4_call_sync,
7139         .match_stateid = nfs4_match_stateid,
7140         .find_root_sec = nfs4_find_root_sec,
7141         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
7142         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
7143         .state_renewal_ops = &nfs40_state_renewal_ops,
7144 };
7145
7146 #if defined(CONFIG_NFS_V4_1)
7147 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
7148         .minor_version = 1,
7149         .call_sync = _nfs4_call_sync_session,
7150         .match_stateid = nfs41_match_stateid,
7151         .find_root_sec = nfs41_find_root_sec,
7152         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
7153         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
7154         .state_renewal_ops = &nfs41_state_renewal_ops,
7155 };
7156 #endif
7157
7158 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
7159         [0] = &nfs_v4_0_minor_ops,
7160 #if defined(CONFIG_NFS_V4_1)
7161         [1] = &nfs_v4_1_minor_ops,
7162 #endif
7163 };
7164
7165 const struct inode_operations nfs4_dir_inode_operations = {
7166         .create         = nfs_create,
7167         .lookup         = nfs_lookup,
7168         .atomic_open    = nfs_atomic_open,
7169         .link           = nfs_link,
7170         .unlink         = nfs_unlink,
7171         .symlink        = nfs_symlink,
7172         .mkdir          = nfs_mkdir,
7173         .rmdir          = nfs_rmdir,
7174         .mknod          = nfs_mknod,
7175         .rename         = nfs_rename,
7176         .permission     = nfs_permission,
7177         .getattr        = nfs_getattr,
7178         .setattr        = nfs_setattr,
7179         .getxattr       = generic_getxattr,
7180         .setxattr       = generic_setxattr,
7181         .listxattr      = generic_listxattr,
7182         .removexattr    = generic_removexattr,
7183 };
7184
7185 static const struct inode_operations nfs4_file_inode_operations = {
7186         .permission     = nfs_permission,
7187         .getattr        = nfs_getattr,
7188         .setattr        = nfs_setattr,
7189         .getxattr       = generic_getxattr,
7190         .setxattr       = generic_setxattr,
7191         .listxattr      = generic_listxattr,
7192         .removexattr    = generic_removexattr,
7193 };
7194
7195 const struct nfs_rpc_ops nfs_v4_clientops = {
7196         .version        = 4,                    /* protocol version */
7197         .dentry_ops     = &nfs4_dentry_operations,
7198         .dir_inode_ops  = &nfs4_dir_inode_operations,
7199         .file_inode_ops = &nfs4_file_inode_operations,
7200         .file_ops       = &nfs4_file_operations,
7201         .getroot        = nfs4_proc_get_root,
7202         .submount       = nfs4_submount,
7203         .try_mount      = nfs4_try_mount,
7204         .getattr        = nfs4_proc_getattr,
7205         .setattr        = nfs4_proc_setattr,
7206         .lookup         = nfs4_proc_lookup,
7207         .access         = nfs4_proc_access,
7208         .readlink       = nfs4_proc_readlink,
7209         .create         = nfs4_proc_create,
7210         .remove         = nfs4_proc_remove,
7211         .unlink_setup   = nfs4_proc_unlink_setup,
7212         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
7213         .unlink_done    = nfs4_proc_unlink_done,
7214         .rename         = nfs4_proc_rename,
7215         .rename_setup   = nfs4_proc_rename_setup,
7216         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
7217         .rename_done    = nfs4_proc_rename_done,
7218         .link           = nfs4_proc_link,
7219         .symlink        = nfs4_proc_symlink,
7220         .mkdir          = nfs4_proc_mkdir,
7221         .rmdir          = nfs4_proc_remove,
7222         .readdir        = nfs4_proc_readdir,
7223         .mknod          = nfs4_proc_mknod,
7224         .statfs         = nfs4_proc_statfs,
7225         .fsinfo         = nfs4_proc_fsinfo,
7226         .pathconf       = nfs4_proc_pathconf,
7227         .set_capabilities = nfs4_server_capabilities,
7228         .decode_dirent  = nfs4_decode_dirent,
7229         .read_setup     = nfs4_proc_read_setup,
7230         .read_pageio_init = pnfs_pageio_init_read,
7231         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
7232         .read_done      = nfs4_read_done,
7233         .write_setup    = nfs4_proc_write_setup,
7234         .write_pageio_init = pnfs_pageio_init_write,
7235         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
7236         .write_done     = nfs4_write_done,
7237         .commit_setup   = nfs4_proc_commit_setup,
7238         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
7239         .commit_done    = nfs4_commit_done,
7240         .lock           = nfs4_proc_lock,
7241         .clear_acl_cache = nfs4_zap_acl_attr,
7242         .close_context  = nfs4_close_context,
7243         .open_context   = nfs4_atomic_open,
7244         .have_delegation = nfs4_have_delegation,
7245         .return_delegation = nfs4_inode_return_delegation,
7246         .alloc_client   = nfs4_alloc_client,
7247         .init_client    = nfs4_init_client,
7248         .free_client    = nfs4_free_client,
7249         .create_server  = nfs4_create_server,
7250         .clone_server   = nfs_clone_server,
7251 };
7252
7253 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
7254         .prefix = XATTR_NAME_NFSV4_ACL,
7255         .list   = nfs4_xattr_list_nfs4_acl,
7256         .get    = nfs4_xattr_get_nfs4_acl,
7257         .set    = nfs4_xattr_set_nfs4_acl,
7258 };
7259
7260 const struct xattr_handler *nfs4_xattr_handlers[] = {
7261         &nfs4_xattr_nfs4_acl_handler,
7262         NULL
7263 };
7264
7265 /*
7266  * Local variables:
7267  *  c-basic-offset: 8
7268  * End:
7269  */