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/sunrpc/gss_api.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/nfs_idmap.h>
  56 #include <linux/sunrpc/bc_xprt.h>
  57 #include <linux/xattr.h>
  58 #include <linux/utsname.h>
  59 #include <linux/freezer.h>
  60
  61 #include "nfs4_fs.h"
  62 #include "delegation.h"
  63 #include "internal.h"
  64 #include "iostat.h"
  65 #include "callback.h"
  66 #include "pnfs.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 static unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE;
  76
  77 struct nfs4_opendata;
  78 static int _nfs4_proc_open(struct nfs4_opendata *data);
  79 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  80 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  81 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  82 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state);
  87 #ifdef CONFIG_NFS_V4_1
  88 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  89 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  90 #endif
  91 /* Prevent leaks of NFSv4 errors into userland */
  92 static int nfs4_map_errors(int err)
  93 {
  94         if (err >= -1000)
  95                 return err;
  96         switch (err) {
  97         case -NFS4ERR_RESOURCE:
  98                 return -EREMOTEIO;
  99         case -NFS4ERR_WRONGSEC:
 100                 return -EPERM;
 101         case -NFS4ERR_BADOWNER:
 102         case -NFS4ERR_BADNAME:
 103                 return -EINVAL;
 104         default:
 105                 dprintk("%s could not handle NFSv4 error %d\n",
 106                                 __func__, -err);
 107                 break;
 108         }
 109         return -EIO;
 110 }
 111
 112 /*
 113  * This is our standard bitmap for GETATTR requests.
 114  */
 115 const u32 nfs4_fattr_bitmap[2] = {
 116         FATTR4_WORD0_TYPE
 117         | FATTR4_WORD0_CHANGE
 118         | FATTR4_WORD0_SIZE
 119         | FATTR4_WORD0_FSID
 120         | FATTR4_WORD0_FILEID,
 121         FATTR4_WORD1_MODE
 122         | FATTR4_WORD1_NUMLINKS
 123         | FATTR4_WORD1_OWNER
 124         | FATTR4_WORD1_OWNER_GROUP
 125         | FATTR4_WORD1_RAWDEV
 126         | FATTR4_WORD1_SPACE_USED
 127         | FATTR4_WORD1_TIME_ACCESS
 128         | FATTR4_WORD1_TIME_METADATA
 129         | FATTR4_WORD1_TIME_MODIFY
 130 };
 131
 132 const u32 nfs4_statfs_bitmap[2] = {
 133         FATTR4_WORD0_FILES_AVAIL
 134         | FATTR4_WORD0_FILES_FREE
 135         | FATTR4_WORD0_FILES_TOTAL,
 136         FATTR4_WORD1_SPACE_AVAIL
 137         | FATTR4_WORD1_SPACE_FREE
 138         | FATTR4_WORD1_SPACE_TOTAL
 139 };
 140
 141 const u32 nfs4_pathconf_bitmap[2] = {
 142         FATTR4_WORD0_MAXLINK
 143         | FATTR4_WORD0_MAXNAME,
 144         0
 145 };
 146
 147 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 148                         | FATTR4_WORD0_MAXREAD
 149                         | FATTR4_WORD0_MAXWRITE
 150                         | FATTR4_WORD0_LEASE_TIME,
 151                         FATTR4_WORD1_TIME_DELTA
 152                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 153                         FATTR4_WORD2_LAYOUT_BLKSIZE
 154 };
 155
 156 const u32 nfs4_fs_locations_bitmap[2] = {
 157         FATTR4_WORD0_TYPE
 158         | FATTR4_WORD0_CHANGE
 159         | FATTR4_WORD0_SIZE
 160         | FATTR4_WORD0_FSID
 161         | FATTR4_WORD0_FILEID
 162         | FATTR4_WORD0_FS_LOCATIONS,
 163         FATTR4_WORD1_MODE
 164         | FATTR4_WORD1_NUMLINKS
 165         | FATTR4_WORD1_OWNER
 166         | FATTR4_WORD1_OWNER_GROUP
 167         | FATTR4_WORD1_RAWDEV
 168         | FATTR4_WORD1_SPACE_USED
 169         | FATTR4_WORD1_TIME_ACCESS
 170         | FATTR4_WORD1_TIME_METADATA
 171         | FATTR4_WORD1_TIME_MODIFY
 172         | FATTR4_WORD1_MOUNTED_ON_FILEID
 173 };
 174
 175 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 176                 struct nfs4_readdir_arg *readdir)
 177 {
 178         __be32 *start, *p;
 179
 180         BUG_ON(readdir->count < 80);
 181         if (cookie > 2) {
 182                 readdir->cookie = cookie;
 183                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 184                 return;
 185         }
 186
 187         readdir->cookie = 0;
 188         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 189         if (cookie == 2)
 190                 return;
 191
 192         /*
 193          * NFSv4 servers do not return entries for '.' and '..'
 194          * Therefore, we fake these entries here.  We let '.'
 195          * have cookie 0 and '..' have cookie 1.  Note that
 196          * when talking to the server, we always send cookie 0
 197          * instead of 1 or 2.
 198          */
 199         start = p = kmap_atomic(*readdir->pages);
 200
 201         if (cookie == 0) {
 202                 *p++ = xdr_one;                                  /* next */
 203                 *p++ = xdr_zero;                   /* cookie, first word */
 204                 *p++ = xdr_one;                   /* cookie, second word */
 205                 *p++ = xdr_one;                             /* entry len */
 206                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 207                 p++;
 208                 *p++ = xdr_one;                         /* bitmap length */
 209                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 210                 *p++ = htonl(8);              /* attribute buffer length */
 211                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 212         }
 213
 214         *p++ = xdr_one;                                  /* next */
 215         *p++ = xdr_zero;                   /* cookie, first word */
 216         *p++ = xdr_two;                   /* cookie, second word */
 217         *p++ = xdr_two;                             /* entry len */
 218         memcpy(p, "..\0\0", 4);                         /* entry */
 219         p++;
 220         *p++ = xdr_one;                         /* bitmap length */
 221         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 222         *p++ = htonl(8);              /* attribute buffer length */
 223         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 224
 225         readdir->pgbase = (char *)p - (char *)start;
 226         readdir->count -= readdir->pgbase;
 227         kunmap_atomic(start);
 228 }
 229
 230 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 231 {
 232         int res;
 233
 234         might_sleep();
 235
 236         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 237                         nfs_wait_bit_killable, TASK_KILLABLE);
 238         return res;
 239 }
 240
 241 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 242 {
 243         int res = 0;
 244
 245         might_sleep();
 246
 247         if (*timeout <= 0)
 248                 *timeout = NFS4_POLL_RETRY_MIN;
 249         if (*timeout > NFS4_POLL_RETRY_MAX)
 250                 *timeout = NFS4_POLL_RETRY_MAX;
 251         freezable_schedule_timeout_killable(*timeout);
 252         if (fatal_signal_pending(current))
 253                 res = -ERESTARTSYS;
 254         *timeout <<= 1;
 255         return res;
 256 }
 257
 258 /* This is the error handling routine for processes that are allowed
 259  * to sleep.
 260  */
 261 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 262 {
 263         struct nfs_client *clp = server->nfs_client;
 264         struct nfs4_state *state = exception->state;
 265         struct inode *inode = exception->inode;
 266         int ret = errorcode;
 267
 268         exception->retry = 0;
 269         switch(errorcode) {
 270                 case 0:
 271                         return 0;
 272                 case -NFS4ERR_OPENMODE:
 273                         if (inode && nfs_have_delegation(inode, FMODE_READ)) {
 274                                 nfs_inode_return_delegation(inode);
 275                                 exception->retry = 1;
 276                                 return 0;
 277                         }
 278                         if (state == NULL)
 279                                 break;
 280                         nfs4_schedule_stateid_recovery(server, state);
 281                         goto wait_on_recovery;
 282                 case -NFS4ERR_DELEG_REVOKED:
 283                 case -NFS4ERR_ADMIN_REVOKED:
 284                 case -NFS4ERR_BAD_STATEID:
 285                         if (state == NULL)
 286                                 break;
 287                         nfs_remove_bad_delegation(state->inode);
 288                         nfs4_schedule_stateid_recovery(server, state);
 289                         goto wait_on_recovery;
 290                 case -NFS4ERR_EXPIRED:
 291                         if (state != NULL)
 292                                 nfs4_schedule_stateid_recovery(server, state);
 293                 case -NFS4ERR_STALE_STATEID:
 294                 case -NFS4ERR_STALE_CLIENTID:
 295                         nfs4_schedule_lease_recovery(clp);
 296                         goto wait_on_recovery;
 297 #if defined(CONFIG_NFS_V4_1)
 298                 case -NFS4ERR_BADSESSION:
 299                 case -NFS4ERR_BADSLOT:
 300                 case -NFS4ERR_BAD_HIGH_SLOT:
 301                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 302                 case -NFS4ERR_DEADSESSION:
 303                 case -NFS4ERR_SEQ_FALSE_RETRY:
 304                 case -NFS4ERR_SEQ_MISORDERED:
 305                         dprintk("%s ERROR: %d Reset session\n", __func__,
 306                                 errorcode);
 307                         nfs4_schedule_session_recovery(clp->cl_session);
 308                         exception->retry = 1;
 309                         break;
 310 #endif /* defined(CONFIG_NFS_V4_1) */
 311                 case -NFS4ERR_FILE_OPEN:
 312                         if (exception->timeout > HZ) {
 313                                 /* We have retried a decent amount, time to
 314                                  * fail
 315                                  */
 316                                 ret = -EBUSY;
 317                                 break;
 318                         }
 319                 case -NFS4ERR_GRACE:
 320                 case -NFS4ERR_DELAY:
 321                 case -EKEYEXPIRED:
 322                         ret = nfs4_delay(server->client, &exception->timeout);
 323                         if (ret != 0)
 324                                 break;
 325                 case -NFS4ERR_RETRY_UNCACHED_REP:
 326                 case -NFS4ERR_OLD_STATEID:
 327                         exception->retry = 1;
 328                         break;
 329                 case -NFS4ERR_BADOWNER:
 330                         /* The following works around a Linux server bug! */
 331                 case -NFS4ERR_BADNAME:
 332                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 333                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 334                                 exception->retry = 1;
 335                                 printk(KERN_WARNING "NFS: v4 server %s "
 336                                                 "does not accept raw "
 337                                                 "uid/gids. "
 338                                                 "Reenabling the idmapper.\n",
 339                                                 server->nfs_client->cl_hostname);
 340                         }
 341         }
 342         /* We failed to handle the error */
 343         return nfs4_map_errors(ret);
 344 wait_on_recovery:
 345         ret = nfs4_wait_clnt_recover(clp);
 346         if (ret == 0)
 347                 exception->retry = 1;
 348         return ret;
 349 }
 350
 351
 352 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 353 {
 354         spin_lock(&clp->cl_lock);
 355         if (time_before(clp->cl_last_renewal,timestamp))
 356                 clp->cl_last_renewal = timestamp;
 357         spin_unlock(&clp->cl_lock);
 358 }
 359
 360 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 361 {
 362         do_renew_lease(server->nfs_client, timestamp);
 363 }
 364
 365 #if defined(CONFIG_NFS_V4_1)
 366
 367 /*
 368  * nfs4_free_slot - free a slot and efficiently update slot table.
 369  *
 370  * freeing a slot is trivially done by clearing its respective bit
 371  * in the bitmap.
 372  * If the freed slotid equals highest_used_slotid we want to update it
 373  * so that the server would be able to size down the slot table if needed,
 374  * otherwise we know that the highest_used_slotid is still in use.
 375  * When updating highest_used_slotid there may be "holes" in the bitmap
 376  * so we need to scan down from highest_used_slotid to 0 looking for the now
 377  * highest slotid in use.
 378  * If none found, highest_used_slotid is set to NFS4_NO_SLOT.
 379  *
 380  * Must be called while holding tbl->slot_tbl_lock
 381  */
 382 static void
 383 nfs4_free_slot(struct nfs4_slot_table *tbl, u32 slotid)
 384 {
 385         BUG_ON(slotid >= NFS4_MAX_SLOT_TABLE);
 386         /* clear used bit in bitmap */
 387         __clear_bit(slotid, tbl->used_slots);
 388
 389         /* update highest_used_slotid when it is freed */
 390         if (slotid == tbl->highest_used_slotid) {
 391                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 392                 if (slotid < tbl->max_slots)
 393                         tbl->highest_used_slotid = slotid;
 394                 else
 395                         tbl->highest_used_slotid = NFS4_NO_SLOT;
 396         }
 397         dprintk("%s: slotid %u highest_used_slotid %d\n", __func__,
 398                 slotid, tbl->highest_used_slotid);
 399 }
 400
 401 bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
 402 {
 403         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 404         return true;
 405 }
 406
 407 /*
 408  * Signal state manager thread if session fore channel is drained
 409  */
 410 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 411 {
 412         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 413                 rpc_wake_up_first(&ses->fc_slot_table.slot_tbl_waitq,
 414                                 nfs4_set_task_privileged, NULL);
 415                 return;
 416         }
 417
 418         if (ses->fc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 419                 return;
 420
 421         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 422         complete(&ses->fc_slot_table.complete);
 423 }
 424
 425 /*
 426  * Signal state manager thread if session back channel is drained
 427  */
 428 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 429 {
 430         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 431             ses->bc_slot_table.highest_used_slotid != NFS4_NO_SLOT)
 432                 return;
 433         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 434         complete(&ses->bc_slot_table.complete);
 435 }
 436
 437 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 438 {
 439         struct nfs4_slot_table *tbl;
 440
 441         tbl = &res->sr_session->fc_slot_table;
 442         if (!res->sr_slot) {
 443                 /* just wake up the next guy waiting since
 444                  * we may have not consumed a slot after all */
 445                 dprintk("%s: No slot\n", __func__);
 446                 return;
 447         }
 448
 449         spin_lock(&tbl->slot_tbl_lock);
 450         nfs4_free_slot(tbl, res->sr_slot - tbl->slots);
 451         nfs4_check_drain_fc_complete(res->sr_session);
 452         spin_unlock(&tbl->slot_tbl_lock);
 453         res->sr_slot = NULL;
 454 }
 455
 456 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 457 {
 458         unsigned long timestamp;
 459         struct nfs_client *clp;
 460
 461         /*
 462          * sr_status remains 1 if an RPC level error occurred. The server
 463          * may or may not have processed the sequence operation..
 464          * Proceed as if the server received and processed the sequence
 465          * operation.
 466          */
 467         if (res->sr_status == 1)
 468                 res->sr_status = NFS_OK;
 469
 470         /* don't increment the sequence number if the task wasn't sent */
 471         if (!RPC_WAS_SENT(task))
 472                 goto out;
 473
 474         /* Check the SEQUENCE operation status */
 475         switch (res->sr_status) {
 476         case 0:
 477                 /* Update the slot's sequence and clientid lease timer */
 478                 ++res->sr_slot->seq_nr;
 479                 timestamp = res->sr_renewal_time;
 480                 clp = res->sr_session->clp;
 481                 do_renew_lease(clp, timestamp);
 482                 /* Check sequence flags */
 483                 if (res->sr_status_flags != 0)
 484                         nfs4_schedule_lease_recovery(clp);
 485                 break;
 486         case -NFS4ERR_DELAY:
 487                 /* The server detected a resend of the RPC call and
 488                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 489                  * of RFC5661.
 490                  */
 491                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 492                         __func__,
 493                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 494                         res->sr_slot->seq_nr);
 495                 goto out_retry;
 496         default:
 497                 /* Just update the slot sequence no. */
 498                 ++res->sr_slot->seq_nr;
 499         }
 500 out:
 501         /* The session may be reset by one of the error handlers. */
 502         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 503         nfs41_sequence_free_slot(res);
 504         return 1;
 505 out_retry:
 506         if (!rpc_restart_call(task))
 507                 goto out;
 508         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 509         return 0;
 510 }
 511
 512 static int nfs4_sequence_done(struct rpc_task *task,
 513                                struct nfs4_sequence_res *res)
 514 {
 515         if (res->sr_session == NULL)
 516                 return 1;
 517         return nfs41_sequence_done(task, res);
 518 }
 519
 520 /*
 521  * nfs4_find_slot - efficiently look for a free slot
 522  *
 523  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 524  * If found, we mark the slot as used, update the highest_used_slotid,
 525  * and respectively set up the sequence operation args.
 526  * The slot number is returned if found, or NFS4_NO_SLOT otherwise.
 527  *
 528  * Note: must be called with under the slot_tbl_lock.
 529  */
 530 static u32
 531 nfs4_find_slot(struct nfs4_slot_table *tbl)
 532 {
 533         u32 slotid;
 534         u32 ret_id = NFS4_NO_SLOT;
 535
 536         dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
 537                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 538                 tbl->max_slots);
 539         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 540         if (slotid >= tbl->max_slots)
 541                 goto out;
 542         __set_bit(slotid, tbl->used_slots);
 543         if (slotid > tbl->highest_used_slotid ||
 544                         tbl->highest_used_slotid == NFS4_NO_SLOT)
 545                 tbl->highest_used_slotid = slotid;
 546         ret_id = slotid;
 547 out:
 548         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 549                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 550         return ret_id;
 551 }
 552
 553 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 554                 struct nfs4_sequence_res *res, int cache_reply)
 555 {
 556         args->sa_session = NULL;
 557         args->sa_cache_this = 0;
 558         if (cache_reply)
 559                 args->sa_cache_this = 1;
 560         res->sr_session = NULL;
 561         res->sr_slot = NULL;
 562 }
 563
 564 int nfs41_setup_sequence(struct nfs4_session *session,
 565                                 struct nfs4_sequence_args *args,
 566                                 struct nfs4_sequence_res *res,
 567                                 struct rpc_task *task)
 568 {
 569         struct nfs4_slot *slot;
 570         struct nfs4_slot_table *tbl;
 571         u32 slotid;
 572
 573         dprintk("--> %s\n", __func__);
 574         /* slot already allocated? */
 575         if (res->sr_slot != NULL)
 576                 return 0;
 577
 578         tbl = &session->fc_slot_table;
 579
 580         spin_lock(&tbl->slot_tbl_lock);
 581         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 582             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 583                 /* The state manager will wait until the slot table is empty */
 584                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 585                 spin_unlock(&tbl->slot_tbl_lock);
 586                 dprintk("%s session is draining\n", __func__);
 587                 return -EAGAIN;
 588         }
 589
 590         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 591             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 592                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 593                 spin_unlock(&tbl->slot_tbl_lock);
 594                 dprintk("%s enforce FIFO order\n", __func__);
 595                 return -EAGAIN;
 596         }
 597
 598         slotid = nfs4_find_slot(tbl);
 599         if (slotid == NFS4_NO_SLOT) {
 600                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 601                 spin_unlock(&tbl->slot_tbl_lock);
 602                 dprintk("<-- %s: no free slots\n", __func__);
 603                 return -EAGAIN;
 604         }
 605         spin_unlock(&tbl->slot_tbl_lock);
 606
 607         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 608         slot = tbl->slots + slotid;
 609         args->sa_session = session;
 610         args->sa_slotid = slotid;
 611
 612         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 613
 614         res->sr_session = session;
 615         res->sr_slot = slot;
 616         res->sr_renewal_time = jiffies;
 617         res->sr_status_flags = 0;
 618         /*
 619          * sr_status is only set in decode_sequence, and so will remain
 620          * set to 1 if an rpc level failure occurs.
 621          */
 622         res->sr_status = 1;
 623         return 0;
 624 }
 625 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 626
 627 int nfs4_setup_sequence(const struct nfs_server *server,
 628                         struct nfs4_sequence_args *args,
 629                         struct nfs4_sequence_res *res,
 630                         struct rpc_task *task)
 631 {
 632         struct nfs4_session *session = nfs4_get_session(server);
 633         int ret = 0;
 634
 635         if (session == NULL)
 636                 goto out;
 637
 638         dprintk("--> %s clp %p session %p sr_slot %td\n",
 639                 __func__, session->clp, session, res->sr_slot ?
 640                         res->sr_slot - session->fc_slot_table.slots : -1);
 641
 642         ret = nfs41_setup_sequence(session, args, res, task);
 643 out:
 644         dprintk("<-- %s status=%d\n", __func__, ret);
 645         return ret;
 646 }
 647
 648 struct nfs41_call_sync_data {
 649         const struct nfs_server *seq_server;
 650         struct nfs4_sequence_args *seq_args;
 651         struct nfs4_sequence_res *seq_res;
 652 };
 653
 654 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 655 {
 656         struct nfs41_call_sync_data *data = calldata;
 657
 658         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 659
 660         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 661                                 data->seq_res, task))
 662                 return;
 663         rpc_call_start(task);
 664 }
 665
 666 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 667 {
 668         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 669         nfs41_call_sync_prepare(task, calldata);
 670 }
 671
 672 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 673 {
 674         struct nfs41_call_sync_data *data = calldata;
 675
 676         nfs41_sequence_done(task, data->seq_res);
 677 }
 678
 679 static const struct rpc_call_ops nfs41_call_sync_ops = {
 680         .rpc_call_prepare = nfs41_call_sync_prepare,
 681         .rpc_call_done = nfs41_call_sync_done,
 682 };
 683
 684 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 685         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 686         .rpc_call_done = nfs41_call_sync_done,
 687 };
 688
 689 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 690                                    struct nfs_server *server,
 691                                    struct rpc_message *msg,
 692                                    struct nfs4_sequence_args *args,
 693                                    struct nfs4_sequence_res *res,
 694                                    int privileged)
 695 {
 696         int ret;
 697         struct rpc_task *task;
 698         struct nfs41_call_sync_data data = {
 699                 .seq_server = server,
 700                 .seq_args = args,
 701                 .seq_res = res,
 702         };
 703         struct rpc_task_setup task_setup = {
 704                 .rpc_client = clnt,
 705                 .rpc_message = msg,
 706                 .callback_ops = &nfs41_call_sync_ops,
 707                 .callback_data = &data
 708         };
 709
 710         if (privileged)
 711                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 712         task = rpc_run_task(&task_setup);
 713         if (IS_ERR(task))
 714                 ret = PTR_ERR(task);
 715         else {
 716                 ret = task->tk_status;
 717                 rpc_put_task(task);
 718         }
 719         return ret;
 720 }
 721
 722 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 723                             struct nfs_server *server,
 724                             struct rpc_message *msg,
 725                             struct nfs4_sequence_args *args,
 726                             struct nfs4_sequence_res *res,
 727                             int cache_reply)
 728 {
 729         nfs41_init_sequence(args, res, cache_reply);
 730         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 731 }
 732
 733 #else
 734 static inline
 735 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 736                 struct nfs4_sequence_res *res, int cache_reply)
 737 {
 738 }
 739
 740 static int nfs4_sequence_done(struct rpc_task *task,
 741                                struct nfs4_sequence_res *res)
 742 {
 743         return 1;
 744 }
 745 #endif /* CONFIG_NFS_V4_1 */
 746
 747 int _nfs4_call_sync(struct rpc_clnt *clnt,
 748                     struct nfs_server *server,
 749                     struct rpc_message *msg,
 750                     struct nfs4_sequence_args *args,
 751                     struct nfs4_sequence_res *res,
 752                     int cache_reply)
 753 {
 754         nfs41_init_sequence(args, res, cache_reply);
 755         return rpc_call_sync(clnt, msg, 0);
 756 }
 757
 758 static inline
 759 int nfs4_call_sync(struct rpc_clnt *clnt,
 760                    struct nfs_server *server,
 761                    struct rpc_message *msg,
 762                    struct nfs4_sequence_args *args,
 763                    struct nfs4_sequence_res *res,
 764                    int cache_reply)
 765 {
 766         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 767                                                 args, res, cache_reply);
 768 }
 769
 770 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 771 {
 772         struct nfs_inode *nfsi = NFS_I(dir);
 773
 774         spin_lock(&dir->i_lock);
 775         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 776         if (!cinfo->atomic || cinfo->before != dir->i_version)
 777                 nfs_force_lookup_revalidate(dir);
 778         dir->i_version = cinfo->after;
 779         spin_unlock(&dir->i_lock);
 780 }
 781
 782 struct nfs4_opendata {
 783         struct kref kref;
 784         struct nfs_openargs o_arg;
 785         struct nfs_openres o_res;
 786         struct nfs_open_confirmargs c_arg;
 787         struct nfs_open_confirmres c_res;
 788         struct nfs4_string owner_name;
 789         struct nfs4_string group_name;
 790         struct nfs_fattr f_attr;
 791         struct dentry *dir;
 792         struct dentry *dentry;
 793         struct nfs4_state_owner *owner;
 794         struct nfs4_state *state;
 795         struct iattr attrs;
 796         unsigned long timestamp;
 797         unsigned int rpc_done : 1;
 798         int rpc_status;
 799         int cancelled;
 800 };
 801
 802
 803 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 804 {
 805         p->o_res.f_attr = &p->f_attr;
 806         p->o_res.seqid = p->o_arg.seqid;
 807         p->c_res.seqid = p->c_arg.seqid;
 808         p->o_res.server = p->o_arg.server;
 809         nfs_fattr_init(&p->f_attr);
 810         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 811 }
 812
 813 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 814                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 815                 const struct iattr *attrs,
 816                 gfp_t gfp_mask)
 817 {
 818         struct dentry *parent = dget_parent(dentry);
 819         struct inode *dir = parent->d_inode;
 820         struct nfs_server *server = NFS_SERVER(dir);
 821         struct nfs4_opendata *p;
 822
 823         p = kzalloc(sizeof(*p), gfp_mask);
 824         if (p == NULL)
 825                 goto err;
 826         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 827         if (p->o_arg.seqid == NULL)
 828                 goto err_free;
 829         nfs_sb_active(dentry->d_sb);
 830         p->dentry = dget(dentry);
 831         p->dir = parent;
 832         p->owner = sp;
 833         atomic_inc(&sp->so_count);
 834         p->o_arg.fh = NFS_FH(dir);
 835         p->o_arg.open_flags = flags;
 836         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 837         p->o_arg.clientid = server->nfs_client->cl_clientid;
 838         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 839         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 840         p->o_arg.name = &dentry->d_name;
 841         p->o_arg.server = server;
 842         p->o_arg.bitmask = server->attr_bitmask;
 843         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 844         if (attrs != NULL && attrs->ia_valid != 0) {
 845                 __be32 verf[2];
 846
 847                 p->o_arg.u.attrs = &p->attrs;
 848                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 849
 850                 verf[0] = jiffies;
 851                 verf[1] = current->pid;
 852                 memcpy(p->o_arg.u.verifier.data, verf,
 853                                 sizeof(p->o_arg.u.verifier.data));
 854         }
 855         p->c_arg.fh = &p->o_res.fh;
 856         p->c_arg.stateid = &p->o_res.stateid;
 857         p->c_arg.seqid = p->o_arg.seqid;
 858         nfs4_init_opendata_res(p);
 859         kref_init(&p->kref);
 860         return p;
 861 err_free:
 862         kfree(p);
 863 err:
 864         dput(parent);
 865         return NULL;
 866 }
 867
 868 static void nfs4_opendata_free(struct kref *kref)
 869 {
 870         struct nfs4_opendata *p = container_of(kref,
 871                         struct nfs4_opendata, kref);
 872         struct super_block *sb = p->dentry->d_sb;
 873
 874         nfs_free_seqid(p->o_arg.seqid);
 875         if (p->state != NULL)
 876                 nfs4_put_open_state(p->state);
 877         nfs4_put_state_owner(p->owner);
 878         dput(p->dir);
 879         dput(p->dentry);
 880         nfs_sb_deactive(sb);
 881         nfs_fattr_free_names(&p->f_attr);
 882         kfree(p);
 883 }
 884
 885 static void nfs4_opendata_put(struct nfs4_opendata *p)
 886 {
 887         if (p != NULL)
 888                 kref_put(&p->kref, nfs4_opendata_free);
 889 }
 890
 891 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 892 {
 893         int ret;
 894
 895         ret = rpc_wait_for_completion_task(task);
 896         return ret;
 897 }
 898
 899 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 900 {
 901         int ret = 0;
 902
 903         if (open_mode & (O_EXCL|O_TRUNC))
 904                 goto out;
 905         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 906                 case FMODE_READ:
 907                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 908                                 && state->n_rdonly != 0;
 909                         break;
 910                 case FMODE_WRITE:
 911                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 912                                 && state->n_wronly != 0;
 913                         break;
 914                 case FMODE_READ|FMODE_WRITE:
 915                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 916                                 && state->n_rdwr != 0;
 917         }
 918 out:
 919         return ret;
 920 }
 921
 922 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 923 {
 924         if (delegation == NULL)
 925                 return 0;
 926         if ((delegation->type & fmode) != fmode)
 927                 return 0;
 928         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 929                 return 0;
 930         nfs_mark_delegation_referenced(delegation);
 931         return 1;
 932 }
 933
 934 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 935 {
 936         switch (fmode) {
 937                 case FMODE_WRITE:
 938                         state->n_wronly++;
 939                         break;
 940                 case FMODE_READ:
 941                         state->n_rdonly++;
 942                         break;
 943                 case FMODE_READ|FMODE_WRITE:
 944                         state->n_rdwr++;
 945         }
 946         nfs4_state_set_mode_locked(state, state->state | fmode);
 947 }
 948
 949 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 950 {
 951         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 952                 nfs4_stateid_copy(&state->stateid, stateid);
 953         nfs4_stateid_copy(&state->open_stateid, stateid);
 954         switch (fmode) {
 955                 case FMODE_READ:
 956                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 957                         break;
 958                 case FMODE_WRITE:
 959                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 960                         break;
 961                 case FMODE_READ|FMODE_WRITE:
 962                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 963         }
 964 }
 965
 966 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 967 {
 968         write_seqlock(&state->seqlock);
 969         nfs_set_open_stateid_locked(state, stateid, fmode);
 970         write_sequnlock(&state->seqlock);
 971 }
 972
 973 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 974 {
 975         /*
 976          * Protect the call to nfs4_state_set_mode_locked and
 977          * serialise the stateid update
 978          */
 979         write_seqlock(&state->seqlock);
 980         if (deleg_stateid != NULL) {
 981                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 982                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 983         }
 984         if (open_stateid != NULL)
 985                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 986         write_sequnlock(&state->seqlock);
 987         spin_lock(&state->owner->so_lock);
 988         update_open_stateflags(state, fmode);
 989         spin_unlock(&state->owner->so_lock);
 990 }
 991
 992 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 993 {
 994         struct nfs_inode *nfsi = NFS_I(state->inode);
 995         struct nfs_delegation *deleg_cur;
 996         int ret = 0;
 997
 998         fmode &= (FMODE_READ|FMODE_WRITE);
 999
1000         rcu_read_lock();
1001         deleg_cur = rcu_dereference(nfsi->delegation);
1002         if (deleg_cur == NULL)
1003                 goto no_delegation;
1004
1005         spin_lock(&deleg_cur->lock);
1006         if (nfsi->delegation != deleg_cur ||
1007             (deleg_cur->type & fmode) != fmode)
1008                 goto no_delegation_unlock;
1009
1010         if (delegation == NULL)
1011                 delegation = &deleg_cur->stateid;
1012         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1013                 goto no_delegation_unlock;
1014
1015         nfs_mark_delegation_referenced(deleg_cur);
1016         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1017         ret = 1;
1018 no_delegation_unlock:
1019         spin_unlock(&deleg_cur->lock);
1020 no_delegation:
1021         rcu_read_unlock();
1022
1023         if (!ret && open_stateid != NULL) {
1024                 __update_open_stateid(state, open_stateid, NULL, fmode);
1025                 ret = 1;
1026         }
1027
1028         return ret;
1029 }
1030
1031
1032 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1033 {
1034         struct nfs_delegation *delegation;
1035
1036         rcu_read_lock();
1037         delegation = rcu_dereference(NFS_I(inode)->delegation);
1038         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1039                 rcu_read_unlock();
1040                 return;
1041         }
1042         rcu_read_unlock();
1043         nfs_inode_return_delegation(inode);
1044 }
1045
1046 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1047 {
1048         struct nfs4_state *state = opendata->state;
1049         struct nfs_inode *nfsi = NFS_I(state->inode);
1050         struct nfs_delegation *delegation;
1051         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
1052         fmode_t fmode = opendata->o_arg.fmode;
1053         nfs4_stateid stateid;
1054         int ret = -EAGAIN;
1055
1056         for (;;) {
1057                 if (can_open_cached(state, fmode, open_mode)) {
1058                         spin_lock(&state->owner->so_lock);
1059                         if (can_open_cached(state, fmode, open_mode)) {
1060                                 update_open_stateflags(state, fmode);
1061                                 spin_unlock(&state->owner->so_lock);
1062                                 goto out_return_state;
1063                         }
1064                         spin_unlock(&state->owner->so_lock);
1065                 }
1066                 rcu_read_lock();
1067                 delegation = rcu_dereference(nfsi->delegation);
1068                 if (!can_open_delegated(delegation, fmode)) {
1069                         rcu_read_unlock();
1070                         break;
1071                 }
1072                 /* Save the delegation */
1073                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1074                 rcu_read_unlock();
1075                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1076                 if (ret != 0)
1077                         goto out;
1078                 ret = -EAGAIN;
1079
1080                 /* Try to update the stateid using the delegation */
1081                 if (update_open_stateid(state, NULL, &stateid, fmode))
1082                         goto out_return_state;
1083         }
1084 out:
1085         return ERR_PTR(ret);
1086 out_return_state:
1087         atomic_inc(&state->count);
1088         return state;
1089 }
1090
1091 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1092 {
1093         struct inode *inode;
1094         struct nfs4_state *state = NULL;
1095         struct nfs_delegation *delegation;
1096         int ret;
1097
1098         if (!data->rpc_done) {
1099                 state = nfs4_try_open_cached(data);
1100                 goto out;
1101         }
1102
1103         ret = -EAGAIN;
1104         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1105                 goto err;
1106         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1107         ret = PTR_ERR(inode);
1108         if (IS_ERR(inode))
1109                 goto err;
1110         ret = -ENOMEM;
1111         state = nfs4_get_open_state(inode, data->owner);
1112         if (state == NULL)
1113                 goto err_put_inode;
1114         if (data->o_res.delegation_type != 0) {
1115                 struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
1116                 int delegation_flags = 0;
1117
1118                 rcu_read_lock();
1119                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1120                 if (delegation)
1121                         delegation_flags = delegation->flags;
1122                 rcu_read_unlock();
1123                 if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1124                         pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1125                                         "returning a delegation for "
1126                                         "OPEN(CLAIM_DELEGATE_CUR)\n",
1127                                         clp->cl_hostname);
1128                 } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1129                         nfs_inode_set_delegation(state->inode,
1130                                         data->owner->so_cred,
1131                                         &data->o_res);
1132                 else
1133                         nfs_inode_reclaim_delegation(state->inode,
1134                                         data->owner->so_cred,
1135                                         &data->o_res);
1136         }
1137
1138         update_open_stateid(state, &data->o_res.stateid, NULL,
1139                         data->o_arg.fmode);
1140         iput(inode);
1141 out:
1142         return state;
1143 err_put_inode:
1144         iput(inode);
1145 err:
1146         return ERR_PTR(ret);
1147 }
1148
1149 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1150 {
1151         struct nfs_inode *nfsi = NFS_I(state->inode);
1152         struct nfs_open_context *ctx;
1153
1154         spin_lock(&state->inode->i_lock);
1155         list_for_each_entry(ctx, &nfsi->open_files, list) {
1156                 if (ctx->state != state)
1157                         continue;
1158                 get_nfs_open_context(ctx);
1159                 spin_unlock(&state->inode->i_lock);
1160                 return ctx;
1161         }
1162         spin_unlock(&state->inode->i_lock);
1163         return ERR_PTR(-ENOENT);
1164 }
1165
1166 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1167 {
1168         struct nfs4_opendata *opendata;
1169
1170         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1171         if (opendata == NULL)
1172                 return ERR_PTR(-ENOMEM);
1173         opendata->state = state;
1174         atomic_inc(&state->count);
1175         return opendata;
1176 }
1177
1178 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1179 {
1180         struct nfs4_state *newstate;
1181         int ret;
1182
1183         opendata->o_arg.open_flags = 0;
1184         opendata->o_arg.fmode = fmode;
1185         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1186         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1187         nfs4_init_opendata_res(opendata);
1188         ret = _nfs4_recover_proc_open(opendata);
1189         if (ret != 0)
1190                 return ret;
1191         newstate = nfs4_opendata_to_nfs4_state(opendata);
1192         if (IS_ERR(newstate))
1193                 return PTR_ERR(newstate);
1194         nfs4_close_state(newstate, fmode);
1195         *res = newstate;
1196         return 0;
1197 }
1198
1199 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1200 {
1201         struct nfs4_state *newstate;
1202         int ret;
1203
1204         /* memory barrier prior to reading state->n_* */
1205         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1206         smp_rmb();
1207         if (state->n_rdwr != 0) {
1208                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1209                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1210                 if (ret != 0)
1211                         return ret;
1212                 if (newstate != state)
1213                         return -ESTALE;
1214         }
1215         if (state->n_wronly != 0) {
1216                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1217                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1218                 if (ret != 0)
1219                         return ret;
1220                 if (newstate != state)
1221                         return -ESTALE;
1222         }
1223         if (state->n_rdonly != 0) {
1224                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1225                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1226                 if (ret != 0)
1227                         return ret;
1228                 if (newstate != state)
1229                         return -ESTALE;
1230         }
1231         /*
1232          * We may have performed cached opens for all three recoveries.
1233          * Check if we need to update the current stateid.
1234          */
1235         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1236             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1237                 write_seqlock(&state->seqlock);
1238                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1239                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1240                 write_sequnlock(&state->seqlock);
1241         }
1242         return 0;
1243 }
1244
1245 /*
1246  * OPEN_RECLAIM:
1247  *      reclaim state on the server after a reboot.
1248  */
1249 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1250 {
1251         struct nfs_delegation *delegation;
1252         struct nfs4_opendata *opendata;
1253         fmode_t delegation_type = 0;
1254         int status;
1255
1256         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1257         if (IS_ERR(opendata))
1258                 return PTR_ERR(opendata);
1259         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1260         opendata->o_arg.fh = NFS_FH(state->inode);
1261         rcu_read_lock();
1262         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1263         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1264                 delegation_type = delegation->type;
1265         rcu_read_unlock();
1266         opendata->o_arg.u.delegation_type = delegation_type;
1267         status = nfs4_open_recover(opendata, state);
1268         nfs4_opendata_put(opendata);
1269         return status;
1270 }
1271
1272 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1273 {
1274         struct nfs_server *server = NFS_SERVER(state->inode);
1275         struct nfs4_exception exception = { };
1276         int err;
1277         do {
1278                 err = _nfs4_do_open_reclaim(ctx, state);
1279                 if (err != -NFS4ERR_DELAY)
1280                         break;
1281                 nfs4_handle_exception(server, err, &exception);
1282         } while (exception.retry);
1283         return err;
1284 }
1285
1286 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1287 {
1288         struct nfs_open_context *ctx;
1289         int ret;
1290
1291         ctx = nfs4_state_find_open_context(state);
1292         if (IS_ERR(ctx))
1293                 return PTR_ERR(ctx);
1294         ret = nfs4_do_open_reclaim(ctx, state);
1295         put_nfs_open_context(ctx);
1296         return ret;
1297 }
1298
1299 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1300 {
1301         struct nfs4_opendata *opendata;
1302         int ret;
1303
1304         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1305         if (IS_ERR(opendata))
1306                 return PTR_ERR(opendata);
1307         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1308         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1309         ret = nfs4_open_recover(opendata, state);
1310         nfs4_opendata_put(opendata);
1311         return ret;
1312 }
1313
1314 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1315 {
1316         struct nfs4_exception exception = { };
1317         struct nfs_server *server = NFS_SERVER(state->inode);
1318         int err;
1319         do {
1320                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1321                 switch (err) {
1322                         case 0:
1323                         case -ENOENT:
1324                         case -ESTALE:
1325                                 goto out;
1326                         case -NFS4ERR_BADSESSION:
1327                         case -NFS4ERR_BADSLOT:
1328                         case -NFS4ERR_BAD_HIGH_SLOT:
1329                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1330                         case -NFS4ERR_DEADSESSION:
1331                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
1332                                 goto out;
1333                         case -NFS4ERR_STALE_CLIENTID:
1334                         case -NFS4ERR_STALE_STATEID:
1335                         case -NFS4ERR_EXPIRED:
1336                                 /* Don't recall a delegation if it was lost */
1337                                 nfs4_schedule_lease_recovery(server->nfs_client);
1338                                 goto out;
1339                         case -ERESTARTSYS:
1340                                 /*
1341                                  * The show must go on: exit, but mark the
1342                                  * stateid as needing recovery.
1343                                  */
1344                         case -NFS4ERR_DELEG_REVOKED:
1345                         case -NFS4ERR_ADMIN_REVOKED:
1346                         case -NFS4ERR_BAD_STATEID:
1347                                 nfs_inode_find_state_and_recover(state->inode,
1348                                                 stateid);
1349                                 nfs4_schedule_stateid_recovery(server, state);
1350                         case -EKEYEXPIRED:
1351                                 /*
1352                                  * User RPCSEC_GSS context has expired.
1353                                  * We cannot recover this stateid now, so
1354                                  * skip it and allow recovery thread to
1355                                  * proceed.
1356                                  */
1357                         case -ENOMEM:
1358                                 err = 0;
1359                                 goto out;
1360                 }
1361                 err = nfs4_handle_exception(server, err, &exception);
1362         } while (exception.retry);
1363 out:
1364         return err;
1365 }
1366
1367 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1368 {
1369         struct nfs4_opendata *data = calldata;
1370
1371         data->rpc_status = task->tk_status;
1372         if (data->rpc_status == 0) {
1373                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1374                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1375                 renew_lease(data->o_res.server, data->timestamp);
1376                 data->rpc_done = 1;
1377         }
1378 }
1379
1380 static void nfs4_open_confirm_release(void *calldata)
1381 {
1382         struct nfs4_opendata *data = calldata;
1383         struct nfs4_state *state = NULL;
1384
1385         /* If this request hasn't been cancelled, do nothing */
1386         if (data->cancelled == 0)
1387                 goto out_free;
1388         /* In case of error, no cleanup! */
1389         if (!data->rpc_done)
1390                 goto out_free;
1391         state = nfs4_opendata_to_nfs4_state(data);
1392         if (!IS_ERR(state))
1393                 nfs4_close_state(state, data->o_arg.fmode);
1394 out_free:
1395         nfs4_opendata_put(data);
1396 }
1397
1398 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1399         .rpc_call_done = nfs4_open_confirm_done,
1400         .rpc_release = nfs4_open_confirm_release,
1401 };
1402
1403 /*
1404  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1405  */
1406 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1407 {
1408         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1409         struct rpc_task *task;
1410         struct  rpc_message msg = {
1411                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1412                 .rpc_argp = &data->c_arg,
1413                 .rpc_resp = &data->c_res,
1414                 .rpc_cred = data->owner->so_cred,
1415         };
1416         struct rpc_task_setup task_setup_data = {
1417                 .rpc_client = server->client,
1418                 .rpc_message = &msg,
1419                 .callback_ops = &nfs4_open_confirm_ops,
1420                 .callback_data = data,
1421                 .workqueue = nfsiod_workqueue,
1422                 .flags = RPC_TASK_ASYNC,
1423         };
1424         int status;
1425
1426         kref_get(&data->kref);
1427         data->rpc_done = 0;
1428         data->rpc_status = 0;
1429         data->timestamp = jiffies;
1430         task = rpc_run_task(&task_setup_data);
1431         if (IS_ERR(task))
1432                 return PTR_ERR(task);
1433         status = nfs4_wait_for_completion_rpc_task(task);
1434         if (status != 0) {
1435                 data->cancelled = 1;
1436                 smp_wmb();
1437         } else
1438                 status = data->rpc_status;
1439         rpc_put_task(task);
1440         return status;
1441 }
1442
1443 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1444 {
1445         struct nfs4_opendata *data = calldata;
1446         struct nfs4_state_owner *sp = data->owner;
1447
1448         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1449                 return;
1450         /*
1451          * Check if we still need to send an OPEN call, or if we can use
1452          * a delegation instead.
1453          */
1454         if (data->state != NULL) {
1455                 struct nfs_delegation *delegation;
1456
1457                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1458                         goto out_no_action;
1459                 rcu_read_lock();
1460                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1461                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1462                     can_open_delegated(delegation, data->o_arg.fmode))
1463                         goto unlock_no_action;
1464                 rcu_read_unlock();
1465         }
1466         /* Update client id. */
1467         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1468         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1469                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1470                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1471         }
1472         data->timestamp = jiffies;
1473         if (nfs4_setup_sequence(data->o_arg.server,
1474                                 &data->o_arg.seq_args,
1475                                 &data->o_res.seq_res, task))
1476                 return;
1477         rpc_call_start(task);
1478         return;
1479 unlock_no_action:
1480         rcu_read_unlock();
1481 out_no_action:
1482         task->tk_action = NULL;
1483
1484 }
1485
1486 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1487 {
1488         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1489         nfs4_open_prepare(task, calldata);
1490 }
1491
1492 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1493 {
1494         struct nfs4_opendata *data = calldata;
1495
1496         data->rpc_status = task->tk_status;
1497
1498         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1499                 return;
1500
1501         if (task->tk_status == 0) {
1502                 switch (data->o_res.f_attr->mode & S_IFMT) {
1503                         case S_IFREG:
1504                                 break;
1505                         case S_IFLNK:
1506                                 data->rpc_status = -ELOOP;
1507                                 break;
1508                         case S_IFDIR:
1509                                 data->rpc_status = -EISDIR;
1510                                 break;
1511                         default:
1512                                 data->rpc_status = -ENOTDIR;
1513                 }
1514                 renew_lease(data->o_res.server, data->timestamp);
1515                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1516                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1517         }
1518         data->rpc_done = 1;
1519 }
1520
1521 static void nfs4_open_release(void *calldata)
1522 {
1523         struct nfs4_opendata *data = calldata;
1524         struct nfs4_state *state = NULL;
1525
1526         /* If this request hasn't been cancelled, do nothing */
1527         if (data->cancelled == 0)
1528                 goto out_free;
1529         /* In case of error, no cleanup! */
1530         if (data->rpc_status != 0 || !data->rpc_done)
1531                 goto out_free;
1532         /* In case we need an open_confirm, no cleanup! */
1533         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1534                 goto out_free;
1535         state = nfs4_opendata_to_nfs4_state(data);
1536         if (!IS_ERR(state))
1537                 nfs4_close_state(state, data->o_arg.fmode);
1538 out_free:
1539         nfs4_opendata_put(data);
1540 }
1541
1542 static const struct rpc_call_ops nfs4_open_ops = {
1543         .rpc_call_prepare = nfs4_open_prepare,
1544         .rpc_call_done = nfs4_open_done,
1545         .rpc_release = nfs4_open_release,
1546 };
1547
1548 static const struct rpc_call_ops nfs4_recover_open_ops = {
1549         .rpc_call_prepare = nfs4_recover_open_prepare,
1550         .rpc_call_done = nfs4_open_done,
1551         .rpc_release = nfs4_open_release,
1552 };
1553
1554 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1555 {
1556         struct inode *dir = data->dir->d_inode;
1557         struct nfs_server *server = NFS_SERVER(dir);
1558         struct nfs_openargs *o_arg = &data->o_arg;
1559         struct nfs_openres *o_res = &data->o_res;
1560         struct rpc_task *task;
1561         struct rpc_message msg = {
1562                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1563                 .rpc_argp = o_arg,
1564                 .rpc_resp = o_res,
1565                 .rpc_cred = data->owner->so_cred,
1566         };
1567         struct rpc_task_setup task_setup_data = {
1568                 .rpc_client = server->client,
1569                 .rpc_message = &msg,
1570                 .callback_ops = &nfs4_open_ops,
1571                 .callback_data = data,
1572                 .workqueue = nfsiod_workqueue,
1573                 .flags = RPC_TASK_ASYNC,
1574         };
1575         int status;
1576
1577         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1578         kref_get(&data->kref);
1579         data->rpc_done = 0;
1580         data->rpc_status = 0;
1581         data->cancelled = 0;
1582         if (isrecover)
1583                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1584         task = rpc_run_task(&task_setup_data);
1585         if (IS_ERR(task))
1586                 return PTR_ERR(task);
1587         status = nfs4_wait_for_completion_rpc_task(task);
1588         if (status != 0) {
1589                 data->cancelled = 1;
1590                 smp_wmb();
1591         } else
1592                 status = data->rpc_status;
1593         rpc_put_task(task);
1594
1595         return status;
1596 }
1597
1598 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1599 {
1600         struct inode *dir = data->dir->d_inode;
1601         struct nfs_openres *o_res = &data->o_res;
1602         int status;
1603
1604         status = nfs4_run_open_task(data, 1);
1605         if (status != 0 || !data->rpc_done)
1606                 return status;
1607
1608         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1609
1610         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1611                 status = _nfs4_proc_open_confirm(data);
1612                 if (status != 0)
1613                         return status;
1614         }
1615
1616         return status;
1617 }
1618
1619 /*
1620  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1621  */
1622 static int _nfs4_proc_open(struct nfs4_opendata *data)
1623 {
1624         struct inode *dir = data->dir->d_inode;
1625         struct nfs_server *server = NFS_SERVER(dir);
1626         struct nfs_openargs *o_arg = &data->o_arg;
1627         struct nfs_openres *o_res = &data->o_res;
1628         int status;
1629
1630         status = nfs4_run_open_task(data, 0);
1631         if (!data->rpc_done)
1632                 return status;
1633         if (status != 0) {
1634                 if (status == -NFS4ERR_BADNAME &&
1635                                 !(o_arg->open_flags & O_CREAT))
1636                         return -ENOENT;
1637                 return status;
1638         }
1639
1640         nfs_fattr_map_and_free_names(server, &data->f_attr);
1641
1642         if (o_arg->open_flags & O_CREAT)
1643                 update_changeattr(dir, &o_res->cinfo);
1644         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1645                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1646         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1647                 status = _nfs4_proc_open_confirm(data);
1648                 if (status != 0)
1649                         return status;
1650         }
1651         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1652                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1653         return 0;
1654 }
1655
1656 static int nfs4_client_recover_expired_lease(struct nfs_client *clp)
1657 {
1658         unsigned int loop;
1659         int ret;
1660
1661         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1662                 ret = nfs4_wait_clnt_recover(clp);
1663                 if (ret != 0)
1664                         break;
1665                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1666                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1667                         break;
1668                 nfs4_schedule_state_manager(clp);
1669                 ret = -EIO;
1670         }
1671         return ret;
1672 }
1673
1674 static int nfs4_recover_expired_lease(struct nfs_server *server)
1675 {
1676         return nfs4_client_recover_expired_lease(server->nfs_client);
1677 }
1678
1679 /*
1680  * OPEN_EXPIRED:
1681  *      reclaim state on the server after a network partition.
1682  *      Assumes caller holds the appropriate lock
1683  */
1684 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1685 {
1686         struct nfs4_opendata *opendata;
1687         int ret;
1688
1689         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1690         if (IS_ERR(opendata))
1691                 return PTR_ERR(opendata);
1692         ret = nfs4_open_recover(opendata, state);
1693         if (ret == -ESTALE)
1694                 d_drop(ctx->dentry);
1695         nfs4_opendata_put(opendata);
1696         return ret;
1697 }
1698
1699 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1700 {
1701         struct nfs_server *server = NFS_SERVER(state->inode);
1702         struct nfs4_exception exception = { };
1703         int err;
1704
1705         do {
1706                 err = _nfs4_open_expired(ctx, state);
1707                 switch (err) {
1708                 default:
1709                         goto out;
1710                 case -NFS4ERR_GRACE:
1711                 case -NFS4ERR_DELAY:
1712                         nfs4_handle_exception(server, err, &exception);
1713                         err = 0;
1714                 }
1715         } while (exception.retry);
1716 out:
1717         return err;
1718 }
1719
1720 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1721 {
1722         struct nfs_open_context *ctx;
1723         int ret;
1724
1725         ctx = nfs4_state_find_open_context(state);
1726         if (IS_ERR(ctx))
1727                 return PTR_ERR(ctx);
1728         ret = nfs4_do_open_expired(ctx, state);
1729         put_nfs_open_context(ctx);
1730         return ret;
1731 }
1732
1733 #if defined(CONFIG_NFS_V4_1)
1734 static int nfs41_check_expired_stateid(struct nfs4_state *state, nfs4_stateid *stateid, unsigned int flags)
1735 {
1736         int status = NFS_OK;
1737         struct nfs_server *server = NFS_SERVER(state->inode);
1738
1739         if (state->flags & flags) {
1740                 status = nfs41_test_stateid(server, stateid);
1741                 if (status != NFS_OK) {
1742                         nfs41_free_stateid(server, stateid);
1743                         state->flags &= ~flags;
1744                 }
1745         }
1746         return status;
1747 }
1748
1749 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1750 {
1751         int deleg_status, open_status;
1752         int deleg_flags = 1 << NFS_DELEGATED_STATE;
1753         int open_flags = (1 << NFS_O_RDONLY_STATE) | (1 << NFS_O_WRONLY_STATE) | (1 << NFS_O_RDWR_STATE);
1754
1755         deleg_status = nfs41_check_expired_stateid(state, &state->stateid, deleg_flags);
1756         open_status = nfs41_check_expired_stateid(state,  &state->open_stateid, open_flags);
1757
1758         if ((deleg_status == NFS_OK) && (open_status == NFS_OK))
1759                 return NFS_OK;
1760         return nfs4_open_expired(sp, state);
1761 }
1762 #endif
1763
1764 /*
1765  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1766  * fields corresponding to attributes that were used to store the verifier.
1767  * Make sure we clobber those fields in the later setattr call
1768  */
1769 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1770 {
1771         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1772             !(sattr->ia_valid & ATTR_ATIME_SET))
1773                 sattr->ia_valid |= ATTR_ATIME;
1774
1775         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1776             !(sattr->ia_valid & ATTR_MTIME_SET))
1777                 sattr->ia_valid |= ATTR_MTIME;
1778 }
1779
1780 /*
1781  * Returns a referenced nfs4_state
1782  */
1783 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1784 {
1785         struct nfs4_state_owner  *sp;
1786         struct nfs4_state     *state = NULL;
1787         struct nfs_server       *server = NFS_SERVER(dir);
1788         struct nfs4_opendata *opendata;
1789         int status;
1790
1791         /* Protect against reboot recovery conflicts */
1792         status = -ENOMEM;
1793         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1794         if (sp == NULL) {
1795                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1796                 goto out_err;
1797         }
1798         status = nfs4_recover_expired_lease(server);
1799         if (status != 0)
1800                 goto err_put_state_owner;
1801         if (dentry->d_inode != NULL)
1802                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1803         status = -ENOMEM;
1804         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1805         if (opendata == NULL)
1806                 goto err_put_state_owner;
1807
1808         if (dentry->d_inode != NULL)
1809                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1810
1811         status = _nfs4_proc_open(opendata);
1812         if (status != 0)
1813                 goto err_opendata_put;
1814
1815         state = nfs4_opendata_to_nfs4_state(opendata);
1816         status = PTR_ERR(state);
1817         if (IS_ERR(state))
1818                 goto err_opendata_put;
1819         if (server->caps & NFS_CAP_POSIX_LOCK)
1820                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1821
1822         if (opendata->o_arg.open_flags & O_EXCL) {
1823                 nfs4_exclusive_attrset(opendata, sattr);
1824
1825                 nfs_fattr_init(opendata->o_res.f_attr);
1826                 status = nfs4_do_setattr(state->inode, cred,
1827                                 opendata->o_res.f_attr, sattr,
1828                                 state);
1829                 if (status == 0)
1830                         nfs_setattr_update_inode(state->inode, sattr);
1831                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1832         }
1833         nfs4_opendata_put(opendata);
1834         nfs4_put_state_owner(sp);
1835         *res = state;
1836         return 0;
1837 err_opendata_put:
1838         nfs4_opendata_put(opendata);
1839 err_put_state_owner:
1840         nfs4_put_state_owner(sp);
1841 out_err:
1842         *res = NULL;
1843         return status;
1844 }
1845
1846
1847 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1848 {
1849         struct nfs4_exception exception = { };
1850         struct nfs4_state *res;
1851         int status;
1852
1853         do {
1854                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred, &res);
1855                 if (status == 0)
1856                         break;
1857                 /* NOTE: BAD_SEQID means the server and client disagree about the
1858                  * book-keeping w.r.t. state-changing operations
1859                  * (OPEN/CLOSE/LOCK/LOCKU...)
1860                  * It is actually a sign of a bug on the client or on the server.
1861                  *
1862                  * If we receive a BAD_SEQID error in the particular case of
1863                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1864                  * have unhashed the old state_owner for us, and that we can
1865                  * therefore safely retry using a new one. We should still warn
1866                  * the user though...
1867                  */
1868                 if (status == -NFS4ERR_BAD_SEQID) {
1869                         pr_warn_ratelimited("NFS: v4 server %s "
1870                                         " returned a bad sequence-id error!\n",
1871                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1872                         exception.retry = 1;
1873                         continue;
1874                 }
1875                 /*
1876                  * BAD_STATEID on OPEN means that the server cancelled our
1877                  * state before it received the OPEN_CONFIRM.
1878                  * Recover by retrying the request as per the discussion
1879                  * on Page 181 of RFC3530.
1880                  */
1881                 if (status == -NFS4ERR_BAD_STATEID) {
1882                         exception.retry = 1;
1883                         continue;
1884                 }
1885                 if (status == -EAGAIN) {
1886                         /* We must have found a delegation */
1887                         exception.retry = 1;
1888                         continue;
1889                 }
1890                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1891                                         status, &exception));
1892         } while (exception.retry);
1893         return res;
1894 }
1895
1896 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1897                             struct nfs_fattr *fattr, struct iattr *sattr,
1898                             struct nfs4_state *state)
1899 {
1900         struct nfs_server *server = NFS_SERVER(inode);
1901         struct nfs_setattrargs  arg = {
1902                 .fh             = NFS_FH(inode),
1903                 .iap            = sattr,
1904                 .server         = server,
1905                 .bitmask = server->attr_bitmask,
1906         };
1907         struct nfs_setattrres  res = {
1908                 .fattr          = fattr,
1909                 .server         = server,
1910         };
1911         struct rpc_message msg = {
1912                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1913                 .rpc_argp       = &arg,
1914                 .rpc_resp       = &res,
1915                 .rpc_cred       = cred,
1916         };
1917         unsigned long timestamp = jiffies;
1918         int status;
1919
1920         nfs_fattr_init(fattr);
1921
1922         if (state != NULL) {
1923                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
1924                                 current->files, current->tgid);
1925         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
1926                                 FMODE_WRITE)) {
1927                 /* Use that stateid */
1928         } else
1929                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
1930
1931         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
1932         if (status == 0 && state != NULL)
1933                 renew_lease(server, timestamp);
1934         return status;
1935 }
1936
1937 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1938                            struct nfs_fattr *fattr, struct iattr *sattr,
1939                            struct nfs4_state *state)
1940 {
1941         struct nfs_server *server = NFS_SERVER(inode);
1942         struct nfs4_exception exception = {
1943                 .state = state,
1944                 .inode = inode,
1945         };
1946         int err;
1947         do {
1948                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
1949                 switch (err) {
1950                 case -NFS4ERR_OPENMODE:
1951                         if (state && !(state->state & FMODE_WRITE)) {
1952                                 err = -EBADF;
1953                                 if (sattr->ia_valid & ATTR_OPEN)
1954                                         err = -EACCES;
1955                                 goto out;
1956                         }
1957                 }
1958                 err = nfs4_handle_exception(server, err, &exception);
1959         } while (exception.retry);
1960 out:
1961         return err;
1962 }
1963
1964 struct nfs4_closedata {
1965         struct inode *inode;
1966         struct nfs4_state *state;
1967         struct nfs_closeargs arg;
1968         struct nfs_closeres res;
1969         struct nfs_fattr fattr;
1970         unsigned long timestamp;
1971         bool roc;
1972         u32 roc_barrier;
1973 };
1974
1975 static void nfs4_free_closedata(void *data)
1976 {
1977         struct nfs4_closedata *calldata = data;
1978         struct nfs4_state_owner *sp = calldata->state->owner;
1979         struct super_block *sb = calldata->state->inode->i_sb;
1980
1981         if (calldata->roc)
1982                 pnfs_roc_release(calldata->state->inode);
1983         nfs4_put_open_state(calldata->state);
1984         nfs_free_seqid(calldata->arg.seqid);
1985         nfs4_put_state_owner(sp);
1986         nfs_sb_deactive(sb);
1987         kfree(calldata);
1988 }
1989
1990 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1991                 fmode_t fmode)
1992 {
1993         spin_lock(&state->owner->so_lock);
1994         if (!(fmode & FMODE_READ))
1995                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1996         if (!(fmode & FMODE_WRITE))
1997                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1998         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1999         spin_unlock(&state->owner->so_lock);
2000 }
2001
2002 static void nfs4_close_done(struct rpc_task *task, void *data)
2003 {
2004         struct nfs4_closedata *calldata = data;
2005         struct nfs4_state *state = calldata->state;
2006         struct nfs_server *server = NFS_SERVER(calldata->inode);
2007
2008         dprintk("%s: begin!\n", __func__);
2009         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2010                 return;
2011         /* hmm. we are done with the inode, and in the process of freeing
2012          * the state_owner. we keep this around to process errors
2013          */
2014         switch (task->tk_status) {
2015                 case 0:
2016                         if (calldata->roc)
2017                                 pnfs_roc_set_barrier(state->inode,
2018                                                      calldata->roc_barrier);
2019                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2020                         renew_lease(server, calldata->timestamp);
2021                         nfs4_close_clear_stateid_flags(state,
2022                                         calldata->arg.fmode);
2023                         break;
2024                 case -NFS4ERR_STALE_STATEID:
2025                 case -NFS4ERR_OLD_STATEID:
2026                 case -NFS4ERR_BAD_STATEID:
2027                 case -NFS4ERR_EXPIRED:
2028                         if (calldata->arg.fmode == 0)
2029                                 break;
2030                 default:
2031                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2032                                 rpc_restart_call_prepare(task);
2033         }
2034         nfs_release_seqid(calldata->arg.seqid);
2035         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2036         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2037 }
2038
2039 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2040 {
2041         struct nfs4_closedata *calldata = data;
2042         struct nfs4_state *state = calldata->state;
2043         int call_close = 0;
2044
2045         dprintk("%s: begin!\n", __func__);
2046         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2047                 return;
2048
2049         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2050         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2051         spin_lock(&state->owner->so_lock);
2052         /* Calculate the change in open mode */
2053         if (state->n_rdwr == 0) {
2054                 if (state->n_rdonly == 0) {
2055                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2056                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2057                         calldata->arg.fmode &= ~FMODE_READ;
2058                 }
2059                 if (state->n_wronly == 0) {
2060                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2061                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2062                         calldata->arg.fmode &= ~FMODE_WRITE;
2063                 }
2064         }
2065         spin_unlock(&state->owner->so_lock);
2066
2067         if (!call_close) {
2068                 /* Note: exit _without_ calling nfs4_close_done */
2069                 task->tk_action = NULL;
2070                 goto out;
2071         }
2072
2073         if (calldata->arg.fmode == 0) {
2074                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2075                 if (calldata->roc &&
2076                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
2077                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
2078                                      task, NULL);
2079                         goto out;
2080                 }
2081         }
2082
2083         nfs_fattr_init(calldata->res.fattr);
2084         calldata->timestamp = jiffies;
2085         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
2086                                 &calldata->arg.seq_args,
2087                                 &calldata->res.seq_res,
2088                                 task))
2089                 goto out;
2090         rpc_call_start(task);
2091 out:
2092         dprintk("%s: done!\n", __func__);
2093 }
2094
2095 static const struct rpc_call_ops nfs4_close_ops = {
2096         .rpc_call_prepare = nfs4_close_prepare,
2097         .rpc_call_done = nfs4_close_done,
2098         .rpc_release = nfs4_free_closedata,
2099 };
2100
2101 /*
2102  * It is possible for data to be read/written from a mem-mapped file
2103  * after the sys_close call (which hits the vfs layer as a flush).
2104  * This means that we can't safely call nfsv4 close on a file until
2105  * the inode is cleared. This in turn means that we are not good
2106  * NFSv4 citizens - we do not indicate to the server to update the file's
2107  * share state even when we are done with one of the three share
2108  * stateid's in the inode.
2109  *
2110  * NOTE: Caller must be holding the sp->so_owner semaphore!
2111  */
2112 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
2113 {
2114         struct nfs_server *server = NFS_SERVER(state->inode);
2115         struct nfs4_closedata *calldata;
2116         struct nfs4_state_owner *sp = state->owner;
2117         struct rpc_task *task;
2118         struct rpc_message msg = {
2119                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2120                 .rpc_cred = state->owner->so_cred,
2121         };
2122         struct rpc_task_setup task_setup_data = {
2123                 .rpc_client = server->client,
2124                 .rpc_message = &msg,
2125                 .callback_ops = &nfs4_close_ops,
2126                 .workqueue = nfsiod_workqueue,
2127                 .flags = RPC_TASK_ASYNC,
2128         };
2129         int status = -ENOMEM;
2130
2131         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2132         if (calldata == NULL)
2133                 goto out;
2134         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2135         calldata->inode = state->inode;
2136         calldata->state = state;
2137         calldata->arg.fh = NFS_FH(state->inode);
2138         calldata->arg.stateid = &state->open_stateid;
2139         /* Serialization for the sequence id */
2140         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2141         if (calldata->arg.seqid == NULL)
2142                 goto out_free_calldata;
2143         calldata->arg.fmode = 0;
2144         calldata->arg.bitmask = server->cache_consistency_bitmask;
2145         calldata->res.fattr = &calldata->fattr;
2146         calldata->res.seqid = calldata->arg.seqid;
2147         calldata->res.server = server;
2148         calldata->roc = roc;
2149         nfs_sb_active(calldata->inode->i_sb);
2150
2151         msg.rpc_argp = &calldata->arg;
2152         msg.rpc_resp = &calldata->res;
2153         task_setup_data.callback_data = calldata;
2154         task = rpc_run_task(&task_setup_data);
2155         if (IS_ERR(task))
2156                 return PTR_ERR(task);
2157         status = 0;
2158         if (wait)
2159                 status = rpc_wait_for_completion_task(task);
2160         rpc_put_task(task);
2161         return status;
2162 out_free_calldata:
2163         kfree(calldata);
2164 out:
2165         if (roc)
2166                 pnfs_roc_release(state->inode);
2167         nfs4_put_open_state(state);
2168         nfs4_put_state_owner(sp);
2169         return status;
2170 }
2171
2172 static struct inode *
2173 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2174 {
2175         struct nfs4_state *state;
2176
2177         /* Protect against concurrent sillydeletes */
2178         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr, ctx->cred);
2179         if (IS_ERR(state))
2180                 return ERR_CAST(state);
2181         ctx->state = state;
2182         return igrab(state->inode);
2183 }
2184
2185 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2186 {
2187         if (ctx->state == NULL)
2188                 return;
2189         if (is_sync)
2190                 nfs4_close_sync(ctx->state, ctx->mode);
2191         else
2192                 nfs4_close_state(ctx->state, ctx->mode);
2193 }
2194
2195 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2196 {
2197         struct nfs4_server_caps_arg args = {
2198                 .fhandle = fhandle,
2199         };
2200         struct nfs4_server_caps_res res = {};
2201         struct rpc_message msg = {
2202                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2203                 .rpc_argp = &args,
2204                 .rpc_resp = &res,
2205         };
2206         int status;
2207
2208         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2209         if (status == 0) {
2210                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2211                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2212                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2213                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2214                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2215                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2216                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2217                         server->caps |= NFS_CAP_ACLS;
2218                 if (res.has_links != 0)
2219                         server->caps |= NFS_CAP_HARDLINKS;
2220                 if (res.has_symlinks != 0)
2221                         server->caps |= NFS_CAP_SYMLINKS;
2222                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2223                         server->caps |= NFS_CAP_FILEID;
2224                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2225                         server->caps |= NFS_CAP_MODE;
2226                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2227                         server->caps |= NFS_CAP_NLINK;
2228                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2229                         server->caps |= NFS_CAP_OWNER;
2230                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2231                         server->caps |= NFS_CAP_OWNER_GROUP;
2232                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2233                         server->caps |= NFS_CAP_ATIME;
2234                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2235                         server->caps |= NFS_CAP_CTIME;
2236                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2237                         server->caps |= NFS_CAP_MTIME;
2238
2239                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2240                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2241                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2242                 server->acl_bitmask = res.acl_bitmask;
2243                 server->fh_expire_type = res.fh_expire_type;
2244         }
2245
2246         return status;
2247 }
2248
2249 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2250 {
2251         struct nfs4_exception exception = { };
2252         int err;
2253         do {
2254                 err = nfs4_handle_exception(server,
2255                                 _nfs4_server_capabilities(server, fhandle),
2256                                 &exception);
2257         } while (exception.retry);
2258         return err;
2259 }
2260
2261 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2262                 struct nfs_fsinfo *info)
2263 {
2264         struct nfs4_lookup_root_arg args = {
2265                 .bitmask = nfs4_fattr_bitmap,
2266         };
2267         struct nfs4_lookup_res res = {
2268                 .server = server,
2269                 .fattr = info->fattr,
2270                 .fh = fhandle,
2271         };
2272         struct rpc_message msg = {
2273                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2274                 .rpc_argp = &args,
2275                 .rpc_resp = &res,
2276         };
2277
2278         nfs_fattr_init(info->fattr);
2279         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2280 }
2281
2282 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2283                 struct nfs_fsinfo *info)
2284 {
2285         struct nfs4_exception exception = { };
2286         int err;
2287         do {
2288                 err = _nfs4_lookup_root(server, fhandle, info);
2289                 switch (err) {
2290                 case 0:
2291                 case -NFS4ERR_WRONGSEC:
2292                         goto out;
2293                 default:
2294                         err = nfs4_handle_exception(server, err, &exception);
2295                 }
2296         } while (exception.retry);
2297 out:
2298         return err;
2299 }
2300
2301 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2302                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2303 {
2304         struct rpc_auth *auth;
2305         int ret;
2306
2307         auth = rpcauth_create(flavor, server->client);
2308         if (!auth) {
2309                 ret = -EIO;
2310                 goto out;
2311         }
2312         ret = nfs4_lookup_root(server, fhandle, info);
2313 out:
2314         return ret;
2315 }
2316
2317 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2318                               struct nfs_fsinfo *info)
2319 {
2320         int i, len, status = 0;
2321         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2322
2323         len = gss_mech_list_pseudoflavors(&flav_array[0]);
2324         flav_array[len] = RPC_AUTH_NULL;
2325         len += 1;
2326
2327         for (i = 0; i < len; i++) {
2328                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2329                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2330                         continue;
2331                 break;
2332         }
2333         /*
2334          * -EACCESS could mean that the user doesn't have correct permissions
2335          * to access the mount.  It could also mean that we tried to mount
2336          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2337          * existing mount programs don't handle -EACCES very well so it should
2338          * be mapped to -EPERM instead.
2339          */
2340         if (status == -EACCES)
2341                 status = -EPERM;
2342         return status;
2343 }
2344
2345 /*
2346  * get the file handle for the "/" directory on the server
2347  */
2348 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2349                               struct nfs_fsinfo *info)
2350 {
2351         int minor_version = server->nfs_client->cl_minorversion;
2352         int status = nfs4_lookup_root(server, fhandle, info);
2353         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2354                 /*
2355                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2356                  * by nfs4_map_errors() as this function exits.
2357                  */
2358                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2359         if (status == 0)
2360                 status = nfs4_server_capabilities(server, fhandle);
2361         if (status == 0)
2362                 status = nfs4_do_fsinfo(server, fhandle, info);
2363         return nfs4_map_errors(status);
2364 }
2365
2366 /*
2367  * Get locations and (maybe) other attributes of a referral.
2368  * Note that we'll actually follow the referral later when
2369  * we detect fsid mismatch in inode revalidation
2370  */
2371 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2372                              const struct qstr *name, struct nfs_fattr *fattr,
2373                              struct nfs_fh *fhandle)
2374 {
2375         int status = -ENOMEM;
2376         struct page *page = NULL;
2377         struct nfs4_fs_locations *locations = NULL;
2378
2379         page = alloc_page(GFP_KERNEL);
2380         if (page == NULL)
2381                 goto out;
2382         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2383         if (locations == NULL)
2384                 goto out;
2385
2386         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2387         if (status != 0)
2388                 goto out;
2389         /* Make sure server returned a different fsid for the referral */
2390         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2391                 dprintk("%s: server did not return a different fsid for"
2392                         " a referral at %s\n", __func__, name->name);
2393                 status = -EIO;
2394                 goto out;
2395         }
2396         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2397         nfs_fixup_referral_attributes(&locations->fattr);
2398
2399         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2400         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2401         memset(fhandle, 0, sizeof(struct nfs_fh));
2402 out:
2403         if (page)
2404                 __free_page(page);
2405         kfree(locations);
2406         return status;
2407 }
2408
2409 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2410 {
2411         struct nfs4_getattr_arg args = {
2412                 .fh = fhandle,
2413                 .bitmask = server->attr_bitmask,
2414         };
2415         struct nfs4_getattr_res res = {
2416                 .fattr = fattr,
2417                 .server = server,
2418         };
2419         struct rpc_message msg = {
2420                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2421                 .rpc_argp = &args,
2422                 .rpc_resp = &res,
2423         };
2424
2425         nfs_fattr_init(fattr);
2426         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2427 }
2428
2429 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2430 {
2431         struct nfs4_exception exception = { };
2432         int err;
2433         do {
2434                 err = nfs4_handle_exception(server,
2435                                 _nfs4_proc_getattr(server, fhandle, fattr),
2436                                 &exception);
2437         } while (exception.retry);
2438         return err;
2439 }
2440
2441 /*
2442  * The file is not closed if it is opened due to the a request to change
2443  * the size of the file. The open call will not be needed once the
2444  * VFS layer lookup-intents are implemented.
2445  *
2446  * Close is called when the inode is destroyed.
2447  * If we haven't opened the file for O_WRONLY, we
2448  * need to in the size_change case to obtain a stateid.
2449  *
2450  * Got race?
2451  * Because OPEN is always done by name in nfsv4, it is
2452  * possible that we opened a different file by the same
2453  * name.  We can recognize this race condition, but we
2454  * can't do anything about it besides returning an error.
2455  *
2456  * This will be fixed with VFS changes (lookup-intent).
2457  */
2458 static int
2459 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2460                   struct iattr *sattr)
2461 {
2462         struct inode *inode = dentry->d_inode;
2463         struct rpc_cred *cred = NULL;
2464         struct nfs4_state *state = NULL;
2465         int status;
2466
2467         if (pnfs_ld_layoutret_on_setattr(inode))
2468                 pnfs_return_layout(inode);
2469
2470         nfs_fattr_init(fattr);
2471
2472         /* Search for an existing open(O_WRITE) file */
2473         if (sattr->ia_valid & ATTR_FILE) {
2474                 struct nfs_open_context *ctx;
2475
2476                 ctx = nfs_file_open_context(sattr->ia_file);
2477                 if (ctx) {
2478                         cred = ctx->cred;
2479                         state = ctx->state;
2480                 }
2481         }
2482
2483         /* Deal with open(O_TRUNC) */
2484         if (sattr->ia_valid & ATTR_OPEN)
2485                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2486
2487         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2488         if (status == 0)
2489                 nfs_setattr_update_inode(inode, sattr);
2490         return status;
2491 }
2492
2493 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2494                 const struct qstr *name, struct nfs_fh *fhandle,
2495                 struct nfs_fattr *fattr)
2496 {
2497         struct nfs_server *server = NFS_SERVER(dir);
2498         int                    status;
2499         struct nfs4_lookup_arg args = {
2500                 .bitmask = server->attr_bitmask,
2501                 .dir_fh = NFS_FH(dir),
2502                 .name = name,
2503         };
2504         struct nfs4_lookup_res res = {
2505                 .server = server,
2506                 .fattr = fattr,
2507                 .fh = fhandle,
2508         };
2509         struct rpc_message msg = {
2510                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2511                 .rpc_argp = &args,
2512                 .rpc_resp = &res,
2513         };
2514
2515         nfs_fattr_init(fattr);
2516
2517         dprintk("NFS call  lookup %s\n", name->name);
2518         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2519         dprintk("NFS reply lookup: %d\n", status);
2520         return status;
2521 }
2522
2523 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2524 {
2525         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2526                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2527         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2528         fattr->nlink = 2;
2529 }
2530
2531 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2532                                    struct qstr *name, struct nfs_fh *fhandle,
2533                                    struct nfs_fattr *fattr)
2534 {
2535         struct nfs4_exception exception = { };
2536         struct rpc_clnt *client = *clnt;
2537         int err;
2538         do {
2539                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2540                 switch (err) {
2541                 case -NFS4ERR_BADNAME:
2542                         err = -ENOENT;
2543                         goto out;
2544                 case -NFS4ERR_MOVED:
2545                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2546                         goto out;
2547                 case -NFS4ERR_WRONGSEC:
2548                         err = -EPERM;
2549                         if (client != *clnt)
2550                                 goto out;
2551
2552                         client = nfs4_create_sec_client(client, dir, name);
2553                         if (IS_ERR(client))
2554                                 return PTR_ERR(client);
2555
2556                         exception.retry = 1;
2557                         break;
2558                 default:
2559                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2560                 }
2561         } while (exception.retry);
2562
2563 out:
2564         if (err == 0)
2565                 *clnt = client;
2566         else if (client != *clnt)
2567                 rpc_shutdown_client(client);
2568
2569         return err;
2570 }
2571
2572 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2573                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2574 {
2575         int status;
2576         struct rpc_clnt *client = NFS_CLIENT(dir);
2577
2578         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2579         if (client != NFS_CLIENT(dir)) {
2580                 rpc_shutdown_client(client);
2581                 nfs_fixup_secinfo_attributes(fattr);
2582         }
2583         return status;
2584 }
2585
2586 struct rpc_clnt *
2587 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2588                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2589 {
2590         int status;
2591         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2592
2593         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2594         if (status < 0) {
2595                 rpc_shutdown_client(client);
2596                 return ERR_PTR(status);
2597         }
2598         return client;
2599 }
2600
2601 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2602 {
2603         struct nfs_server *server = NFS_SERVER(inode);
2604         struct nfs4_accessargs args = {
2605                 .fh = NFS_FH(inode),
2606                 .bitmask = server->cache_consistency_bitmask,
2607         };
2608         struct nfs4_accessres res = {
2609                 .server = server,
2610         };
2611         struct rpc_message msg = {
2612                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2613                 .rpc_argp = &args,
2614                 .rpc_resp = &res,
2615                 .rpc_cred = entry->cred,
2616         };
2617         int mode = entry->mask;
2618         int status;
2619
2620         /*
2621          * Determine which access bits we want to ask for...
2622          */
2623         if (mode & MAY_READ)
2624                 args.access |= NFS4_ACCESS_READ;
2625         if (S_ISDIR(inode->i_mode)) {
2626                 if (mode & MAY_WRITE)
2627                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2628                 if (mode & MAY_EXEC)
2629                         args.access |= NFS4_ACCESS_LOOKUP;
2630         } else {
2631                 if (mode & MAY_WRITE)
2632                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2633                 if (mode & MAY_EXEC)
2634                         args.access |= NFS4_ACCESS_EXECUTE;
2635         }
2636
2637         res.fattr = nfs_alloc_fattr();
2638         if (res.fattr == NULL)
2639                 return -ENOMEM;
2640
2641         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2642         if (!status) {
2643                 entry->mask = 0;
2644                 if (res.access & NFS4_ACCESS_READ)
2645                         entry->mask |= MAY_READ;
2646                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2647                         entry->mask |= MAY_WRITE;
2648                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2649                         entry->mask |= MAY_EXEC;
2650                 nfs_refresh_inode(inode, res.fattr);
2651         }
2652         nfs_free_fattr(res.fattr);
2653         return status;
2654 }
2655
2656 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2657 {
2658         struct nfs4_exception exception = { };
2659         int err;
2660         do {
2661                 err = nfs4_handle_exception(NFS_SERVER(inode),
2662                                 _nfs4_proc_access(inode, entry),
2663                                 &exception);
2664         } while (exception.retry);
2665         return err;
2666 }
2667
2668 /*
2669  * TODO: For the time being, we don't try to get any attributes
2670  * along with any of the zero-copy operations READ, READDIR,
2671  * READLINK, WRITE.
2672  *
2673  * In the case of the first three, we want to put the GETATTR
2674  * after the read-type operation -- this is because it is hard
2675  * to predict the length of a GETATTR response in v4, and thus
2676  * align the READ data correctly.  This means that the GETATTR
2677  * may end up partially falling into the page cache, and we should
2678  * shift it into the 'tail' of the xdr_buf before processing.
2679  * To do this efficiently, we need to know the total length
2680  * of data received, which doesn't seem to be available outside
2681  * of the RPC layer.
2682  *
2683  * In the case of WRITE, we also want to put the GETATTR after
2684  * the operation -- in this case because we want to make sure
2685  * we get the post-operation mtime and size.  This means that
2686  * we can't use xdr_encode_pages() as written: we need a variant
2687  * of it which would leave room in the 'tail' iovec.
2688  *
2689  * Both of these changes to the XDR layer would in fact be quite
2690  * minor, but I decided to leave them for a subsequent patch.
2691  */
2692 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2693                 unsigned int pgbase, unsigned int pglen)
2694 {
2695         struct nfs4_readlink args = {
2696                 .fh       = NFS_FH(inode),
2697                 .pgbase   = pgbase,
2698                 .pglen    = pglen,
2699                 .pages    = &page,
2700         };
2701         struct nfs4_readlink_res res;
2702         struct rpc_message msg = {
2703                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2704                 .rpc_argp = &args,
2705                 .rpc_resp = &res,
2706         };
2707
2708         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2709 }
2710
2711 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2712                 unsigned int pgbase, unsigned int pglen)
2713 {
2714         struct nfs4_exception exception = { };
2715         int err;
2716         do {
2717                 err = nfs4_handle_exception(NFS_SERVER(inode),
2718                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2719                                 &exception);
2720         } while (exception.retry);
2721         return err;
2722 }
2723
2724 /*
2725  * Got race?
2726  * We will need to arrange for the VFS layer to provide an atomic open.
2727  * Until then, this create/open method is prone to inefficiency and race
2728  * conditions due to the lookup, create, and open VFS calls from sys_open()
2729  * placed on the wire.
2730  *
2731  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2732  * The file will be opened again in the subsequent VFS open call
2733  * (nfs4_proc_file_open).
2734  *
2735  * The open for read will just hang around to be used by any process that
2736  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2737  */
2738
2739 static int
2740 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2741                  int flags, struct nfs_open_context *ctx)
2742 {
2743         struct dentry *de = dentry;
2744         struct nfs4_state *state;
2745         struct rpc_cred *cred = NULL;
2746         fmode_t fmode = 0;
2747         int status = 0;
2748
2749         if (ctx != NULL) {
2750                 cred = ctx->cred;
2751                 de = ctx->dentry;
2752                 fmode = ctx->mode;
2753         }
2754         sattr->ia_mode &= ~current_umask();
2755         state = nfs4_do_open(dir, de, fmode, flags, sattr, cred);
2756         d_drop(dentry);
2757         if (IS_ERR(state)) {
2758                 status = PTR_ERR(state);
2759                 goto out;
2760         }
2761         d_add(dentry, igrab(state->inode));
2762         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2763         if (ctx != NULL)
2764                 ctx->state = state;
2765         else
2766                 nfs4_close_sync(state, fmode);
2767 out:
2768         return status;
2769 }
2770
2771 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2772 {
2773         struct nfs_server *server = NFS_SERVER(dir);
2774         struct nfs_removeargs args = {
2775                 .fh = NFS_FH(dir),
2776                 .name.len = name->len,
2777                 .name.name = name->name,
2778                 .bitmask = server->attr_bitmask,
2779         };
2780         struct nfs_removeres res = {
2781                 .server = server,
2782         };
2783         struct rpc_message msg = {
2784                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2785                 .rpc_argp = &args,
2786                 .rpc_resp = &res,
2787         };
2788         int status = -ENOMEM;
2789
2790         res.dir_attr = nfs_alloc_fattr();
2791         if (res.dir_attr == NULL)
2792                 goto out;
2793
2794         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2795         if (status == 0) {
2796                 update_changeattr(dir, &res.cinfo);
2797                 nfs_post_op_update_inode(dir, res.dir_attr);
2798         }
2799         nfs_free_fattr(res.dir_attr);
2800 out:
2801         return status;
2802 }
2803
2804 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2805 {
2806         struct nfs4_exception exception = { };
2807         int err;
2808         do {
2809                 err = nfs4_handle_exception(NFS_SERVER(dir),
2810                                 _nfs4_proc_remove(dir, name),
2811                                 &exception);
2812         } while (exception.retry);
2813         return err;
2814 }
2815
2816 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2817 {
2818         struct nfs_server *server = NFS_SERVER(dir);
2819         struct nfs_removeargs *args = msg->rpc_argp;
2820         struct nfs_removeres *res = msg->rpc_resp;
2821
2822         args->bitmask = server->cache_consistency_bitmask;
2823         res->server = server;
2824         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2825         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2826 }
2827
2828 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2829 {
2830         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2831                                 &data->args.seq_args,
2832                                 &data->res.seq_res,
2833                                 task))
2834                 return;
2835         rpc_call_start(task);
2836 }
2837
2838 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2839 {
2840         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2841
2842         if (!nfs4_sequence_done(task, &res->seq_res))
2843                 return 0;
2844         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2845                 return 0;
2846         update_changeattr(dir, &res->cinfo);
2847         nfs_post_op_update_inode(dir, res->dir_attr);
2848         return 1;
2849 }
2850
2851 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2852 {
2853         struct nfs_server *server = NFS_SERVER(dir);
2854         struct nfs_renameargs *arg = msg->rpc_argp;
2855         struct nfs_renameres *res = msg->rpc_resp;
2856
2857         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2858         arg->bitmask = server->attr_bitmask;
2859         res->server = server;
2860         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2861 }
2862
2863 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2864 {
2865         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2866                                 &data->args.seq_args,
2867                                 &data->res.seq_res,
2868                                 task))
2869                 return;
2870         rpc_call_start(task);
2871 }
2872
2873 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2874                                  struct inode *new_dir)
2875 {
2876         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2877
2878         if (!nfs4_sequence_done(task, &res->seq_res))
2879                 return 0;
2880         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2881                 return 0;
2882
2883         update_changeattr(old_dir, &res->old_cinfo);
2884         nfs_post_op_update_inode(old_dir, res->old_fattr);
2885         update_changeattr(new_dir, &res->new_cinfo);
2886         nfs_post_op_update_inode(new_dir, res->new_fattr);
2887         return 1;
2888 }
2889
2890 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2891                 struct inode *new_dir, struct qstr *new_name)
2892 {
2893         struct nfs_server *server = NFS_SERVER(old_dir);
2894         struct nfs_renameargs arg = {
2895                 .old_dir = NFS_FH(old_dir),
2896                 .new_dir = NFS_FH(new_dir),
2897                 .old_name = old_name,
2898                 .new_name = new_name,
2899                 .bitmask = server->attr_bitmask,
2900         };
2901         struct nfs_renameres res = {
2902                 .server = server,
2903         };
2904         struct rpc_message msg = {
2905                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2906                 .rpc_argp = &arg,
2907                 .rpc_resp = &res,
2908         };
2909         int status = -ENOMEM;
2910
2911         res.old_fattr = nfs_alloc_fattr();
2912         res.new_fattr = nfs_alloc_fattr();
2913         if (res.old_fattr == NULL || res.new_fattr == NULL)
2914                 goto out;
2915
2916         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2917         if (!status) {
2918                 update_changeattr(old_dir, &res.old_cinfo);
2919                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2920                 update_changeattr(new_dir, &res.new_cinfo);
2921                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2922         }
2923 out:
2924         nfs_free_fattr(res.new_fattr);
2925         nfs_free_fattr(res.old_fattr);
2926         return status;
2927 }
2928
2929 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2930                 struct inode *new_dir, struct qstr *new_name)
2931 {
2932         struct nfs4_exception exception = { };
2933         int err;
2934         do {
2935                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2936                                 _nfs4_proc_rename(old_dir, old_name,
2937                                         new_dir, new_name),
2938                                 &exception);
2939         } while (exception.retry);
2940         return err;
2941 }
2942
2943 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2944 {
2945         struct nfs_server *server = NFS_SERVER(inode);
2946         struct nfs4_link_arg arg = {
2947                 .fh     = NFS_FH(inode),
2948                 .dir_fh = NFS_FH(dir),
2949                 .name   = name,
2950                 .bitmask = server->attr_bitmask,
2951         };
2952         struct nfs4_link_res res = {
2953                 .server = server,
2954         };
2955         struct rpc_message msg = {
2956                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2957                 .rpc_argp = &arg,
2958                 .rpc_resp = &res,
2959         };
2960         int status = -ENOMEM;
2961
2962         res.fattr = nfs_alloc_fattr();
2963         res.dir_attr = nfs_alloc_fattr();
2964         if (res.fattr == NULL || res.dir_attr == NULL)
2965                 goto out;
2966
2967         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2968         if (!status) {
2969                 update_changeattr(dir, &res.cinfo);
2970                 nfs_post_op_update_inode(dir, res.dir_attr);
2971                 nfs_post_op_update_inode(inode, res.fattr);
2972         }
2973 out:
2974         nfs_free_fattr(res.dir_attr);
2975         nfs_free_fattr(res.fattr);
2976         return status;
2977 }
2978
2979 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2980 {
2981         struct nfs4_exception exception = { };
2982         int err;
2983         do {
2984                 err = nfs4_handle_exception(NFS_SERVER(inode),
2985                                 _nfs4_proc_link(inode, dir, name),
2986                                 &exception);
2987         } while (exception.retry);
2988         return err;
2989 }
2990
2991 struct nfs4_createdata {
2992         struct rpc_message msg;
2993         struct nfs4_create_arg arg;
2994         struct nfs4_create_res res;
2995         struct nfs_fh fh;
2996         struct nfs_fattr fattr;
2997 };
2998
2999 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3000                 struct qstr *name, struct iattr *sattr, u32 ftype)
3001 {
3002         struct nfs4_createdata *data;
3003
3004         data = kzalloc(sizeof(*data), GFP_KERNEL);
3005         if (data != NULL) {
3006                 struct nfs_server *server = NFS_SERVER(dir);
3007
3008                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3009                 data->msg.rpc_argp = &data->arg;
3010                 data->msg.rpc_resp = &data->res;
3011                 data->arg.dir_fh = NFS_FH(dir);
3012                 data->arg.server = server;
3013                 data->arg.name = name;
3014                 data->arg.attrs = sattr;
3015                 data->arg.ftype = ftype;
3016                 data->arg.bitmask = server->attr_bitmask;
3017                 data->res.server = server;
3018                 data->res.fh = &data->fh;
3019                 data->res.fattr = &data->fattr;
3020                 nfs_fattr_init(data->res.fattr);
3021         }
3022         return data;
3023 }
3024
3025 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3026 {
3027         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3028                                     &data->arg.seq_args, &data->res.seq_res, 1);
3029         if (status == 0) {
3030                 update_changeattr(dir, &data->res.dir_cinfo);
3031                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3032         }
3033         return status;
3034 }
3035
3036 static void nfs4_free_createdata(struct nfs4_createdata *data)
3037 {
3038         kfree(data);
3039 }
3040
3041 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3042                 struct page *page, unsigned int len, struct iattr *sattr)
3043 {
3044         struct nfs4_createdata *data;
3045         int status = -ENAMETOOLONG;
3046
3047         if (len > NFS4_MAXPATHLEN)
3048                 goto out;
3049
3050         status = -ENOMEM;
3051         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3052         if (data == NULL)
3053                 goto out;
3054
3055         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3056         data->arg.u.symlink.pages = &page;
3057         data->arg.u.symlink.len = len;
3058
3059         status = nfs4_do_create(dir, dentry, data);
3060
3061         nfs4_free_createdata(data);
3062 out:
3063         return status;
3064 }
3065
3066 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3067                 struct page *page, unsigned int len, struct iattr *sattr)
3068 {
3069         struct nfs4_exception exception = { };
3070         int err;
3071         do {
3072                 err = nfs4_handle_exception(NFS_SERVER(dir),
3073                                 _nfs4_proc_symlink(dir, dentry, page,
3074                                                         len, sattr),
3075                                 &exception);
3076         } while (exception.retry);
3077         return err;
3078 }
3079
3080 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3081                 struct iattr *sattr)
3082 {
3083         struct nfs4_createdata *data;
3084         int status = -ENOMEM;
3085
3086         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3087         if (data == NULL)
3088                 goto out;
3089
3090         status = nfs4_do_create(dir, dentry, data);
3091
3092         nfs4_free_createdata(data);
3093 out:
3094         return status;
3095 }
3096
3097 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3098                 struct iattr *sattr)
3099 {
3100         struct nfs4_exception exception = { };
3101         int err;
3102
3103         sattr->ia_mode &= ~current_umask();
3104         do {
3105                 err = nfs4_handle_exception(NFS_SERVER(dir),
3106                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3107                                 &exception);
3108         } while (exception.retry);
3109         return err;
3110 }
3111
3112 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3113                 u64 cookie, struct page **pages, unsigned int count, int plus)
3114 {
3115         struct inode            *dir = dentry->d_inode;
3116         struct nfs4_readdir_arg args = {
3117                 .fh = NFS_FH(dir),
3118                 .pages = pages,
3119                 .pgbase = 0,
3120                 .count = count,
3121                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3122                 .plus = plus,
3123         };
3124         struct nfs4_readdir_res res;
3125         struct rpc_message msg = {
3126                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3127                 .rpc_argp = &args,
3128                 .rpc_resp = &res,
3129                 .rpc_cred = cred,
3130         };
3131         int                     status;
3132
3133         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3134                         dentry->d_parent->d_name.name,
3135                         dentry->d_name.name,
3136                         (unsigned long long)cookie);
3137         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
3138         res.pgbase = args.pgbase;
3139         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3140         if (status >= 0) {
3141                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
3142                 status += args.pgbase;
3143         }
3144
3145         nfs_invalidate_atime(dir);
3146
3147         dprintk("%s: returns %d\n", __func__, status);
3148         return status;
3149 }
3150
3151 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3152                 u64 cookie, struct page **pages, unsigned int count, int plus)
3153 {
3154         struct nfs4_exception exception = { };
3155         int err;
3156         do {
3157                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3158                                 _nfs4_proc_readdir(dentry, cred, cookie,
3159                                         pages, count, plus),
3160                                 &exception);
3161         } while (exception.retry);
3162         return err;
3163 }
3164
3165 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3166                 struct iattr *sattr, dev_t rdev)
3167 {
3168         struct nfs4_createdata *data;
3169         int mode = sattr->ia_mode;
3170         int status = -ENOMEM;
3171
3172         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
3173         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
3174
3175         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3176         if (data == NULL)
3177                 goto out;
3178
3179         if (S_ISFIFO(mode))
3180                 data->arg.ftype = NF4FIFO;
3181         else if (S_ISBLK(mode)) {
3182                 data->arg.ftype = NF4BLK;
3183                 data->arg.u.device.specdata1 = MAJOR(rdev);
3184                 data->arg.u.device.specdata2 = MINOR(rdev);
3185         }
3186         else if (S_ISCHR(mode)) {
3187                 data->arg.ftype = NF4CHR;
3188                 data->arg.u.device.specdata1 = MAJOR(rdev);
3189                 data->arg.u.device.specdata2 = MINOR(rdev);
3190         }
3191
3192         status = nfs4_do_create(dir, dentry, data);
3193
3194         nfs4_free_createdata(data);
3195 out:
3196         return status;
3197 }
3198
3199 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3200                 struct iattr *sattr, dev_t rdev)
3201 {
3202         struct nfs4_exception exception = { };
3203         int err;
3204
3205         sattr->ia_mode &= ~current_umask();
3206         do {
3207                 err = nfs4_handle_exception(NFS_SERVER(dir),
3208                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3209                                 &exception);
3210         } while (exception.retry);
3211         return err;
3212 }
3213
3214 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3215                  struct nfs_fsstat *fsstat)
3216 {
3217         struct nfs4_statfs_arg args = {
3218                 .fh = fhandle,
3219                 .bitmask = server->attr_bitmask,
3220         };
3221         struct nfs4_statfs_res res = {
3222                 .fsstat = fsstat,
3223         };
3224         struct rpc_message msg = {
3225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3226                 .rpc_argp = &args,
3227                 .rpc_resp = &res,
3228         };
3229
3230         nfs_fattr_init(fsstat->fattr);
3231         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3232 }
3233
3234 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3235 {
3236         struct nfs4_exception exception = { };
3237         int err;
3238         do {
3239                 err = nfs4_handle_exception(server,
3240                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3241                                 &exception);
3242         } while (exception.retry);
3243         return err;
3244 }
3245
3246 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3247                 struct nfs_fsinfo *fsinfo)
3248 {
3249         struct nfs4_fsinfo_arg args = {
3250                 .fh = fhandle,
3251                 .bitmask = server->attr_bitmask,
3252         };
3253         struct nfs4_fsinfo_res res = {
3254                 .fsinfo = fsinfo,
3255         };
3256         struct rpc_message msg = {
3257                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3258                 .rpc_argp = &args,
3259                 .rpc_resp = &res,
3260         };
3261
3262         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3263 }
3264
3265 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3266 {
3267         struct nfs4_exception exception = { };
3268         int err;
3269
3270         do {
3271                 err = nfs4_handle_exception(server,
3272                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3273                                 &exception);
3274         } while (exception.retry);
3275         return err;
3276 }
3277
3278 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3279 {
3280         nfs_fattr_init(fsinfo->fattr);
3281         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3282 }
3283
3284 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3285                 struct nfs_pathconf *pathconf)
3286 {
3287         struct nfs4_pathconf_arg args = {
3288                 .fh = fhandle,
3289                 .bitmask = server->attr_bitmask,
3290         };
3291         struct nfs4_pathconf_res res = {
3292                 .pathconf = pathconf,
3293         };
3294         struct rpc_message msg = {
3295                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3296                 .rpc_argp = &args,
3297                 .rpc_resp = &res,
3298         };
3299
3300         /* None of the pathconf attributes are mandatory to implement */
3301         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3302                 memset(pathconf, 0, sizeof(*pathconf));
3303                 return 0;
3304         }
3305
3306         nfs_fattr_init(pathconf->fattr);
3307         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3308 }
3309
3310 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3311                 struct nfs_pathconf *pathconf)
3312 {
3313         struct nfs4_exception exception = { };
3314         int err;
3315
3316         do {
3317                 err = nfs4_handle_exception(server,
3318                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3319                                 &exception);
3320         } while (exception.retry);
3321         return err;
3322 }
3323
3324 void __nfs4_read_done_cb(struct nfs_read_data *data)
3325 {
3326         nfs_invalidate_atime(data->header->inode);
3327 }
3328
3329 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3330 {
3331         struct nfs_server *server = NFS_SERVER(data->header->inode);
3332
3333         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3334                 rpc_restart_call_prepare(task);
3335                 return -EAGAIN;
3336         }
3337
3338         __nfs4_read_done_cb(data);
3339         if (task->tk_status > 0)
3340                 renew_lease(server, data->timestamp);
3341         return 0;
3342 }
3343
3344 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3345 {
3346
3347         dprintk("--> %s\n", __func__);
3348
3349         if (!nfs4_sequence_done(task, &data->res.seq_res))
3350                 return -EAGAIN;
3351
3352         return data->read_done_cb ? data->read_done_cb(task, data) :
3353                                     nfs4_read_done_cb(task, data);
3354 }
3355
3356 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3357 {
3358         data->timestamp   = jiffies;
3359         data->read_done_cb = nfs4_read_done_cb;
3360         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3361         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3362 }
3363
3364 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3365 {
3366         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3367                                 &data->args.seq_args,
3368                                 &data->res.seq_res,
3369                                 task))
3370                 return;
3371         rpc_call_start(task);
3372 }
3373
3374 /* Reset the the nfs_read_data to send the read to the MDS. */
3375 void nfs4_reset_read(struct rpc_task *task, struct nfs_read_data *data)
3376 {
3377         struct nfs_pgio_header *hdr = data->header;
3378         struct inode *inode = hdr->inode;
3379
3380         dprintk("%s Reset task for i/o through\n", __func__);
3381         data->ds_clp = NULL;
3382         /* offsets will differ in the dense stripe case */
3383         data->args.offset = data->mds_offset;
3384         data->args.fh     = NFS_FH(inode);
3385         data->read_done_cb = nfs4_read_done_cb;
3386         task->tk_ops = hdr->mds_ops;
3387         rpc_task_reset_client(task, NFS_CLIENT(inode));
3388 }
3389 EXPORT_SYMBOL_GPL(nfs4_reset_read);
3390
3391 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3392 {
3393         struct inode *inode = data->header->inode;
3394
3395         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3396                 rpc_restart_call_prepare(task);
3397                 return -EAGAIN;
3398         }
3399         if (task->tk_status >= 0) {
3400                 renew_lease(NFS_SERVER(inode), data->timestamp);
3401                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3402         }
3403         return 0;
3404 }
3405
3406 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3407 {
3408         if (!nfs4_sequence_done(task, &data->res.seq_res))
3409                 return -EAGAIN;
3410         return data->write_done_cb ? data->write_done_cb(task, data) :
3411                 nfs4_write_done_cb(task, data);
3412 }
3413
3414 /* Reset the the nfs_write_data to send the write to the MDS. */
3415 void nfs4_reset_write(struct rpc_task *task, struct nfs_write_data *data)
3416 {
3417         struct nfs_pgio_header *hdr = data->header;
3418         struct inode *inode = hdr->inode;
3419
3420         dprintk("%s Reset task for i/o through\n", __func__);
3421         data->ds_clp     = NULL;
3422         data->write_done_cb = nfs4_write_done_cb;
3423         data->args.fh       = NFS_FH(inode);
3424         data->args.bitmask  = data->res.server->cache_consistency_bitmask;
3425         data->args.offset   = data->mds_offset;
3426         data->res.fattr     = &data->fattr;
3427         task->tk_ops        = hdr->mds_ops;
3428         rpc_task_reset_client(task, NFS_CLIENT(inode));
3429 }
3430 EXPORT_SYMBOL_GPL(nfs4_reset_write);
3431
3432 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3433 {
3434         struct nfs_server *server = NFS_SERVER(data->header->inode);
3435
3436         if (data->ds_clp) {
3437                 data->args.bitmask = NULL;
3438                 data->res.fattr = NULL;
3439         } else
3440                 data->args.bitmask = server->cache_consistency_bitmask;
3441         if (!data->write_done_cb)
3442                 data->write_done_cb = nfs4_write_done_cb;
3443         data->res.server = server;
3444         data->timestamp   = jiffies;
3445
3446         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3447         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3448 }
3449
3450 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3451 {
3452         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3453                                 &data->args.seq_args,
3454                                 &data->res.seq_res,
3455                                 task))
3456                 return;
3457         rpc_call_start(task);
3458 }
3459
3460 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3461 {
3462         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3463                                 &data->args.seq_args,
3464                                 &data->res.seq_res,
3465                                 task))
3466                 return;
3467         rpc_call_start(task);
3468 }
3469
3470 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3471 {
3472         struct inode *inode = data->inode;
3473
3474         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3475                 rpc_restart_call_prepare(task);
3476                 return -EAGAIN;
3477         }
3478         nfs_refresh_inode(inode, data->res.fattr);
3479         return 0;
3480 }
3481
3482 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3483 {
3484         if (!nfs4_sequence_done(task, &data->res.seq_res))
3485                 return -EAGAIN;
3486         return data->commit_done_cb(task, data);
3487 }
3488
3489 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3490 {
3491         struct nfs_server *server = NFS_SERVER(data->inode);
3492
3493         if (data->lseg) {
3494                 data->args.bitmask = NULL;
3495                 data->res.fattr = NULL;
3496         } else
3497                 data->args.bitmask = server->cache_consistency_bitmask;
3498         if (data->commit_done_cb == NULL)
3499                 data->commit_done_cb = nfs4_commit_done_cb;
3500         data->res.server = server;
3501         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3502         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3503 }
3504
3505 struct nfs4_renewdata {
3506         struct nfs_client       *client;
3507         unsigned long           timestamp;
3508 };
3509
3510 /*
3511  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3512  * standalone procedure for queueing an asynchronous RENEW.
3513  */
3514 static void nfs4_renew_release(void *calldata)
3515 {
3516         struct nfs4_renewdata *data = calldata;
3517         struct nfs_client *clp = data->client;
3518
3519         if (atomic_read(&clp->cl_count) > 1)
3520                 nfs4_schedule_state_renewal(clp);
3521         nfs_put_client(clp);
3522         kfree(data);
3523 }
3524
3525 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3526 {
3527         struct nfs4_renewdata *data = calldata;
3528         struct nfs_client *clp = data->client;
3529         unsigned long timestamp = data->timestamp;
3530
3531         if (task->tk_status < 0) {
3532                 /* Unless we're shutting down, schedule state recovery! */
3533                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3534                         return;
3535                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3536                         nfs4_schedule_lease_recovery(clp);
3537                         return;
3538                 }
3539                 nfs4_schedule_path_down_recovery(clp);
3540         }
3541         do_renew_lease(clp, timestamp);
3542 }
3543
3544 static const struct rpc_call_ops nfs4_renew_ops = {
3545         .rpc_call_done = nfs4_renew_done,
3546         .rpc_release = nfs4_renew_release,
3547 };
3548
3549 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3550 {
3551         struct rpc_message msg = {
3552                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3553                 .rpc_argp       = clp,
3554                 .rpc_cred       = cred,
3555         };
3556         struct nfs4_renewdata *data;
3557
3558         if (renew_flags == 0)
3559                 return 0;
3560         if (!atomic_inc_not_zero(&clp->cl_count))
3561                 return -EIO;
3562         data = kmalloc(sizeof(*data), GFP_NOFS);
3563         if (data == NULL)
3564                 return -ENOMEM;
3565         data->client = clp;
3566         data->timestamp = jiffies;
3567         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3568                         &nfs4_renew_ops, data);
3569 }
3570
3571 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3572 {
3573         struct rpc_message msg = {
3574                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3575                 .rpc_argp       = clp,
3576                 .rpc_cred       = cred,
3577         };
3578         unsigned long now = jiffies;
3579         int status;
3580
3581         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3582         if (status < 0)
3583                 return status;
3584         do_renew_lease(clp, now);
3585         return 0;
3586 }
3587
3588 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3589 {
3590         return (server->caps & NFS_CAP_ACLS)
3591                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3592                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3593 }
3594
3595 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3596  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3597  * the stack.
3598  */
3599 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3600
3601 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3602                 struct page **pages, unsigned int *pgbase)
3603 {
3604         struct page *newpage, **spages;
3605         int rc = 0;
3606         size_t len;
3607         spages = pages;
3608
3609         do {
3610                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3611                 newpage = alloc_page(GFP_KERNEL);
3612
3613                 if (newpage == NULL)
3614                         goto unwind;
3615                 memcpy(page_address(newpage), buf, len);
3616                 buf += len;
3617                 buflen -= len;
3618                 *pages++ = newpage;
3619                 rc++;
3620         } while (buflen != 0);
3621
3622         return rc;
3623
3624 unwind:
3625         for(; rc > 0; rc--)
3626                 __free_page(spages[rc-1]);
3627         return -ENOMEM;
3628 }
3629
3630 struct nfs4_cached_acl {
3631         int cached;
3632         size_t len;
3633         char data[0];
3634 };
3635
3636 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3637 {
3638         struct nfs_inode *nfsi = NFS_I(inode);
3639
3640         spin_lock(&inode->i_lock);
3641         kfree(nfsi->nfs4_acl);
3642         nfsi->nfs4_acl = acl;
3643         spin_unlock(&inode->i_lock);
3644 }
3645
3646 static void nfs4_zap_acl_attr(struct inode *inode)
3647 {
3648         nfs4_set_cached_acl(inode, NULL);
3649 }
3650
3651 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3652 {
3653         struct nfs_inode *nfsi = NFS_I(inode);
3654         struct nfs4_cached_acl *acl;
3655         int ret = -ENOENT;
3656
3657         spin_lock(&inode->i_lock);
3658         acl = nfsi->nfs4_acl;
3659         if (acl == NULL)
3660                 goto out;
3661         if (buf == NULL) /* user is just asking for length */
3662                 goto out_len;
3663         if (acl->cached == 0)
3664                 goto out;
3665         ret = -ERANGE; /* see getxattr(2) man page */
3666         if (acl->len > buflen)
3667                 goto out;
3668         memcpy(buf, acl->data, acl->len);
3669 out_len:
3670         ret = acl->len;
3671 out:
3672         spin_unlock(&inode->i_lock);
3673         return ret;
3674 }
3675
3676 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3677 {
3678         struct nfs4_cached_acl *acl;
3679
3680         if (pages && acl_len <= PAGE_SIZE) {
3681                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3682                 if (acl == NULL)
3683                         goto out;
3684                 acl->cached = 1;
3685                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3686         } else {
3687                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3688                 if (acl == NULL)
3689                         goto out;
3690                 acl->cached = 0;
3691         }
3692         acl->len = acl_len;
3693 out:
3694         nfs4_set_cached_acl(inode, acl);
3695 }
3696
3697 /*
3698  * The getxattr API returns the required buffer length when called with a
3699  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3700  * the required buf.  On a NULL buf, we send a page of data to the server
3701  * guessing that the ACL request can be serviced by a page. If so, we cache
3702  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3703  * the cache. If not so, we throw away the page, and cache the required
3704  * length. The next getxattr call will then produce another round trip to
3705  * the server, this time with the input buf of the required size.
3706  */
3707 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3708 {
3709         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3710         struct nfs_getaclargs args = {
3711                 .fh = NFS_FH(inode),
3712                 .acl_pages = pages,
3713                 .acl_len = buflen,
3714         };
3715         struct nfs_getaclres res = {
3716                 .acl_len = buflen,
3717         };
3718         struct rpc_message msg = {
3719                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3720                 .rpc_argp = &args,
3721                 .rpc_resp = &res,
3722         };
3723         int ret = -ENOMEM, npages, i, acl_len = 0;
3724
3725         npages = (buflen + PAGE_SIZE - 1) >> PAGE_SHIFT;
3726         /* As long as we're doing a round trip to the server anyway,
3727          * let's be prepared for a page of acl data. */
3728         if (npages == 0)
3729                 npages = 1;
3730
3731         /* Add an extra page to handle the bitmap returned */
3732         npages++;
3733
3734         for (i = 0; i < npages; i++) {
3735                 pages[i] = alloc_page(GFP_KERNEL);
3736                 if (!pages[i])
3737                         goto out_free;
3738         }
3739
3740         /* for decoding across pages */
3741         res.acl_scratch = alloc_page(GFP_KERNEL);
3742         if (!res.acl_scratch)
3743                 goto out_free;
3744
3745         args.acl_len = npages * PAGE_SIZE;
3746         args.acl_pgbase = 0;
3747
3748         /* Let decode_getfacl know not to fail if the ACL data is larger than
3749          * the page we send as a guess */
3750         if (buf == NULL)
3751                 res.acl_flags |= NFS4_ACL_LEN_REQUEST;
3752
3753         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3754                 __func__, buf, buflen, npages, args.acl_len);
3755         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3756                              &msg, &args.seq_args, &res.seq_res, 0);
3757         if (ret)
3758                 goto out_free;
3759
3760         acl_len = res.acl_len - res.acl_data_offset;
3761         if (acl_len > args.acl_len)
3762                 nfs4_write_cached_acl(inode, NULL, 0, acl_len);
3763         else
3764                 nfs4_write_cached_acl(inode, pages, res.acl_data_offset,
3765                                       acl_len);
3766         if (buf) {
3767                 ret = -ERANGE;
3768                 if (acl_len > buflen)
3769                         goto out_free;
3770                 _copy_from_pages(buf, pages, res.acl_data_offset,
3771                                 acl_len);
3772         }
3773         ret = acl_len;
3774 out_free:
3775         for (i = 0; i < npages; i++)
3776                 if (pages[i])
3777                         __free_page(pages[i]);
3778         if (res.acl_scratch)
3779                 __free_page(res.acl_scratch);
3780         return ret;
3781 }
3782
3783 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3784 {
3785         struct nfs4_exception exception = { };
3786         ssize_t ret;
3787         do {
3788                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3789                 if (ret >= 0)
3790                         break;
3791                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3792         } while (exception.retry);
3793         return ret;
3794 }
3795
3796 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3797 {
3798         struct nfs_server *server = NFS_SERVER(inode);
3799         int ret;
3800
3801         if (!nfs4_server_supports_acls(server))
3802                 return -EOPNOTSUPP;
3803         ret = nfs_revalidate_inode(server, inode);
3804         if (ret < 0)
3805                 return ret;
3806         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3807                 nfs_zap_acl_cache(inode);
3808         ret = nfs4_read_cached_acl(inode, buf, buflen);
3809         if (ret != -ENOENT)
3810                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3811                  * but no cached acl data, just the acl length */
3812                 return ret;
3813         return nfs4_get_acl_uncached(inode, buf, buflen);
3814 }
3815
3816 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3817 {
3818         struct nfs_server *server = NFS_SERVER(inode);
3819         struct page *pages[NFS4ACL_MAXPAGES];
3820         struct nfs_setaclargs arg = {
3821                 .fh             = NFS_FH(inode),
3822                 .acl_pages      = pages,
3823                 .acl_len        = buflen,
3824         };
3825         struct nfs_setaclres res;
3826         struct rpc_message msg = {
3827                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3828                 .rpc_argp       = &arg,
3829                 .rpc_resp       = &res,
3830         };
3831         int ret, i;
3832
3833         if (!nfs4_server_supports_acls(server))
3834                 return -EOPNOTSUPP;
3835         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3836         if (i < 0)
3837                 return i;
3838         nfs_inode_return_delegation(inode);
3839         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3840
3841         /*
3842          * Free each page after tx, so the only ref left is
3843          * held by the network stack
3844          */
3845         for (; i > 0; i--)
3846                 put_page(pages[i-1]);
3847
3848         /*
3849          * Acl update can result in inode attribute update.
3850          * so mark the attribute cache invalid.
3851          */
3852         spin_lock(&inode->i_lock);
3853         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3854         spin_unlock(&inode->i_lock);
3855         nfs_access_zap_cache(inode);
3856         nfs_zap_acl_cache(inode);
3857         return ret;
3858 }
3859
3860 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3861 {
3862         struct nfs4_exception exception = { };
3863         int err;
3864         do {
3865                 err = nfs4_handle_exception(NFS_SERVER(inode),
3866                                 __nfs4_proc_set_acl(inode, buf, buflen),
3867                                 &exception);
3868         } while (exception.retry);
3869         return err;
3870 }
3871
3872 static int
3873 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3874 {
3875         struct nfs_client *clp = server->nfs_client;
3876
3877         if (task->tk_status >= 0)
3878                 return 0;
3879         switch(task->tk_status) {
3880                 case -NFS4ERR_DELEG_REVOKED:
3881                 case -NFS4ERR_ADMIN_REVOKED:
3882                 case -NFS4ERR_BAD_STATEID:
3883                         if (state == NULL)
3884                                 break;
3885                         nfs_remove_bad_delegation(state->inode);
3886                 case -NFS4ERR_OPENMODE:
3887                         if (state == NULL)
3888                                 break;
3889                         nfs4_schedule_stateid_recovery(server, state);
3890                         goto wait_on_recovery;
3891                 case -NFS4ERR_EXPIRED:
3892                         if (state != NULL)
3893                                 nfs4_schedule_stateid_recovery(server, state);
3894                 case -NFS4ERR_STALE_STATEID:
3895                 case -NFS4ERR_STALE_CLIENTID:
3896                         nfs4_schedule_lease_recovery(clp);
3897                         goto wait_on_recovery;
3898 #if defined(CONFIG_NFS_V4_1)
3899                 case -NFS4ERR_BADSESSION:
3900                 case -NFS4ERR_BADSLOT:
3901                 case -NFS4ERR_BAD_HIGH_SLOT:
3902                 case -NFS4ERR_DEADSESSION:
3903                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3904                 case -NFS4ERR_SEQ_FALSE_RETRY:
3905                 case -NFS4ERR_SEQ_MISORDERED:
3906                         dprintk("%s ERROR %d, Reset session\n", __func__,
3907                                 task->tk_status);
3908                         nfs4_schedule_session_recovery(clp->cl_session);
3909                         task->tk_status = 0;
3910                         return -EAGAIN;
3911 #endif /* CONFIG_NFS_V4_1 */
3912                 case -NFS4ERR_DELAY:
3913                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3914                 case -NFS4ERR_GRACE:
3915                 case -EKEYEXPIRED:
3916                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3917                         task->tk_status = 0;
3918                         return -EAGAIN;
3919                 case -NFS4ERR_RETRY_UNCACHED_REP:
3920                 case -NFS4ERR_OLD_STATEID:
3921                         task->tk_status = 0;
3922                         return -EAGAIN;
3923         }
3924         task->tk_status = nfs4_map_errors(task->tk_status);
3925         return 0;
3926 wait_on_recovery:
3927         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3928         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3929                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3930         task->tk_status = 0;
3931         return -EAGAIN;
3932 }
3933
3934 static void nfs4_construct_boot_verifier(struct nfs_client *clp,
3935                                          nfs4_verifier *bootverf)
3936 {
3937         __be32 verf[2];
3938
3939         verf[0] = htonl((u32)clp->cl_boot_time.tv_sec);
3940         verf[1] = htonl((u32)clp->cl_boot_time.tv_nsec);
3941         memcpy(bootverf->data, verf, sizeof(bootverf->data));
3942 }
3943
3944 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3945                 unsigned short port, struct rpc_cred *cred,
3946                 struct nfs4_setclientid_res *res)
3947 {
3948         nfs4_verifier sc_verifier;
3949         struct nfs4_setclientid setclientid = {
3950                 .sc_verifier = &sc_verifier,
3951                 .sc_prog = program,
3952                 .sc_cb_ident = clp->cl_cb_ident,
3953         };
3954         struct rpc_message msg = {
3955                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3956                 .rpc_argp = &setclientid,
3957                 .rpc_resp = res,
3958                 .rpc_cred = cred,
3959         };
3960         int loop = 0;
3961         int status;
3962
3963         nfs4_construct_boot_verifier(clp, &sc_verifier);
3964
3965         for(;;) {
3966                 rcu_read_lock();
3967                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3968                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3969                                 clp->cl_ipaddr,
3970                                 rpc_peeraddr2str(clp->cl_rpcclient,
3971                                                         RPC_DISPLAY_ADDR),
3972                                 rpc_peeraddr2str(clp->cl_rpcclient,
3973                                                         RPC_DISPLAY_PROTO),
3974                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3975                                 clp->cl_id_uniquifier);
3976                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3977                                 sizeof(setclientid.sc_netid),
3978                                 rpc_peeraddr2str(clp->cl_rpcclient,
3979                                                         RPC_DISPLAY_NETID));
3980                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3981                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3982                                 clp->cl_ipaddr, port >> 8, port & 255);
3983                 rcu_read_unlock();
3984
3985                 status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
3986                 if (status != -NFS4ERR_CLID_INUSE)
3987                         break;
3988                 if (loop != 0) {
3989                         ++clp->cl_id_uniquifier;
3990                         break;
3991                 }
3992                 ++loop;
3993                 ssleep(clp->cl_lease_time / HZ + 1);
3994         }
3995         return status;
3996 }
3997
3998 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3999                 struct nfs4_setclientid_res *arg,
4000                 struct rpc_cred *cred)
4001 {
4002         struct nfs_fsinfo fsinfo;
4003         struct rpc_message msg = {
4004                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4005                 .rpc_argp = arg,
4006                 .rpc_resp = &fsinfo,
4007                 .rpc_cred = cred,
4008         };
4009         unsigned long now;
4010         int status;
4011
4012         now = jiffies;
4013         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4014         if (status == 0) {
4015                 spin_lock(&clp->cl_lock);
4016                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4017                 clp->cl_last_renewal = now;
4018                 spin_unlock(&clp->cl_lock);
4019         }
4020         return status;
4021 }
4022
4023 struct nfs4_delegreturndata {
4024         struct nfs4_delegreturnargs args;
4025         struct nfs4_delegreturnres res;
4026         struct nfs_fh fh;
4027         nfs4_stateid stateid;
4028         unsigned long timestamp;
4029         struct nfs_fattr fattr;
4030         int rpc_status;
4031 };
4032
4033 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4034 {
4035         struct nfs4_delegreturndata *data = calldata;
4036
4037         if (!nfs4_sequence_done(task, &data->res.seq_res))
4038                 return;
4039
4040         switch (task->tk_status) {
4041         case -NFS4ERR_STALE_STATEID:
4042         case -NFS4ERR_EXPIRED:
4043         case 0:
4044                 renew_lease(data->res.server, data->timestamp);
4045                 break;
4046         default:
4047                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4048                                 -EAGAIN) {
4049                         rpc_restart_call_prepare(task);
4050                         return;
4051                 }
4052         }
4053         data->rpc_status = task->tk_status;
4054 }
4055
4056 static void nfs4_delegreturn_release(void *calldata)
4057 {
4058         kfree(calldata);
4059 }
4060
4061 #if defined(CONFIG_NFS_V4_1)
4062 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4063 {
4064         struct nfs4_delegreturndata *d_data;
4065
4066         d_data = (struct nfs4_delegreturndata *)data;
4067
4068         if (nfs4_setup_sequence(d_data->res.server,
4069                                 &d_data->args.seq_args,
4070                                 &d_data->res.seq_res, task))
4071                 return;
4072         rpc_call_start(task);
4073 }
4074 #endif /* CONFIG_NFS_V4_1 */
4075
4076 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4077 #if defined(CONFIG_NFS_V4_1)
4078         .rpc_call_prepare = nfs4_delegreturn_prepare,
4079 #endif /* CONFIG_NFS_V4_1 */
4080         .rpc_call_done = nfs4_delegreturn_done,
4081         .rpc_release = nfs4_delegreturn_release,
4082 };
4083
4084 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4085 {
4086         struct nfs4_delegreturndata *data;
4087         struct nfs_server *server = NFS_SERVER(inode);
4088         struct rpc_task *task;
4089         struct rpc_message msg = {
4090                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4091                 .rpc_cred = cred,
4092         };
4093         struct rpc_task_setup task_setup_data = {
4094                 .rpc_client = server->client,
4095                 .rpc_message = &msg,
4096                 .callback_ops = &nfs4_delegreturn_ops,
4097                 .flags = RPC_TASK_ASYNC,
4098         };
4099         int status = 0;
4100
4101         data = kzalloc(sizeof(*data), GFP_NOFS);
4102         if (data == NULL)
4103                 return -ENOMEM;
4104         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4105         data->args.fhandle = &data->fh;
4106         data->args.stateid = &data->stateid;
4107         data->args.bitmask = server->cache_consistency_bitmask;
4108         nfs_copy_fh(&data->fh, NFS_FH(inode));
4109         nfs4_stateid_copy(&data->stateid, stateid);
4110         data->res.fattr = &data->fattr;
4111         data->res.server = server;
4112         nfs_fattr_init(data->res.fattr);
4113         data->timestamp = jiffies;
4114         data->rpc_status = 0;
4115
4116         task_setup_data.callback_data = data;
4117         msg.rpc_argp = &data->args;
4118         msg.rpc_resp = &data->res;
4119         task = rpc_run_task(&task_setup_data);
4120         if (IS_ERR(task))
4121                 return PTR_ERR(task);
4122         if (!issync)
4123                 goto out;
4124         status = nfs4_wait_for_completion_rpc_task(task);
4125         if (status != 0)
4126                 goto out;
4127         status = data->rpc_status;
4128         if (status == 0)
4129                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4130         else
4131                 nfs_refresh_inode(inode, &data->fattr);
4132 out:
4133         rpc_put_task(task);
4134         return status;
4135 }
4136
4137 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4138 {
4139         struct nfs_server *server = NFS_SERVER(inode);
4140         struct nfs4_exception exception = { };
4141         int err;
4142         do {
4143                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4144                 switch (err) {
4145                         case -NFS4ERR_STALE_STATEID:
4146                         case -NFS4ERR_EXPIRED:
4147                         case 0:
4148                                 return 0;
4149                 }
4150                 err = nfs4_handle_exception(server, err, &exception);
4151         } while (exception.retry);
4152         return err;
4153 }
4154
4155 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4156 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4157
4158 /*
4159  * sleep, with exponential backoff, and retry the LOCK operation.
4160  */
4161 static unsigned long
4162 nfs4_set_lock_task_retry(unsigned long timeout)
4163 {
4164         freezable_schedule_timeout_killable(timeout);
4165         timeout <<= 1;
4166         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4167                 return NFS4_LOCK_MAXTIMEOUT;
4168         return timeout;
4169 }
4170
4171 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4172 {
4173         struct inode *inode = state->inode;
4174         struct nfs_server *server = NFS_SERVER(inode);
4175         struct nfs_client *clp = server->nfs_client;
4176         struct nfs_lockt_args arg = {
4177                 .fh = NFS_FH(inode),
4178                 .fl = request,
4179         };
4180         struct nfs_lockt_res res = {
4181                 .denied = request,
4182         };
4183         struct rpc_message msg = {
4184                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4185                 .rpc_argp       = &arg,
4186                 .rpc_resp       = &res,
4187                 .rpc_cred       = state->owner->so_cred,
4188         };
4189         struct nfs4_lock_state *lsp;
4190         int status;
4191
4192         arg.lock_owner.clientid = clp->cl_clientid;
4193         status = nfs4_set_lock_state(state, request);
4194         if (status != 0)
4195                 goto out;
4196         lsp = request->fl_u.nfs4_fl.owner;
4197         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4198         arg.lock_owner.s_dev = server->s_dev;
4199         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4200         switch (status) {
4201                 case 0:
4202                         request->fl_type = F_UNLCK;
4203                         break;
4204                 case -NFS4ERR_DENIED:
4205                         status = 0;
4206         }
4207         request->fl_ops->fl_release_private(request);
4208 out:
4209         return status;
4210 }
4211
4212 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4213 {
4214         struct nfs4_exception exception = { };
4215         int err;
4216
4217         do {
4218                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4219                                 _nfs4_proc_getlk(state, cmd, request),
4220                                 &exception);
4221         } while (exception.retry);
4222         return err;
4223 }
4224
4225 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4226 {
4227         int res = 0;
4228         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4229                 case FL_POSIX:
4230                         res = posix_lock_file_wait(file, fl);
4231                         break;
4232                 case FL_FLOCK:
4233                         res = flock_lock_file_wait(file, fl);
4234                         break;
4235                 default:
4236                         BUG();
4237         }
4238         return res;
4239 }
4240
4241 struct nfs4_unlockdata {
4242         struct nfs_locku_args arg;
4243         struct nfs_locku_res res;
4244         struct nfs4_lock_state *lsp;
4245         struct nfs_open_context *ctx;
4246         struct file_lock fl;
4247         const struct nfs_server *server;
4248         unsigned long timestamp;
4249 };
4250
4251 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4252                 struct nfs_open_context *ctx,
4253                 struct nfs4_lock_state *lsp,
4254                 struct nfs_seqid *seqid)
4255 {
4256         struct nfs4_unlockdata *p;
4257         struct inode *inode = lsp->ls_state->inode;
4258
4259         p = kzalloc(sizeof(*p), GFP_NOFS);
4260         if (p == NULL)
4261                 return NULL;
4262         p->arg.fh = NFS_FH(inode);
4263         p->arg.fl = &p->fl;
4264         p->arg.seqid = seqid;
4265         p->res.seqid = seqid;
4266         p->arg.stateid = &lsp->ls_stateid;
4267         p->lsp = lsp;
4268         atomic_inc(&lsp->ls_count);
4269         /* Ensure we don't close file until we're done freeing locks! */
4270         p->ctx = get_nfs_open_context(ctx);
4271         memcpy(&p->fl, fl, sizeof(p->fl));
4272         p->server = NFS_SERVER(inode);
4273         return p;
4274 }
4275
4276 static void nfs4_locku_release_calldata(void *data)
4277 {
4278         struct nfs4_unlockdata *calldata = data;
4279         nfs_free_seqid(calldata->arg.seqid);
4280         nfs4_put_lock_state(calldata->lsp);
4281         put_nfs_open_context(calldata->ctx);
4282         kfree(calldata);
4283 }
4284
4285 static void nfs4_locku_done(struct rpc_task *task, void *data)
4286 {
4287         struct nfs4_unlockdata *calldata = data;
4288
4289         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4290                 return;
4291         switch (task->tk_status) {
4292                 case 0:
4293                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4294                                         &calldata->res.stateid);
4295                         renew_lease(calldata->server, calldata->timestamp);
4296                         break;
4297                 case -NFS4ERR_BAD_STATEID:
4298                 case -NFS4ERR_OLD_STATEID:
4299                 case -NFS4ERR_STALE_STATEID:
4300                 case -NFS4ERR_EXPIRED:
4301                         break;
4302                 default:
4303                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4304                                 rpc_restart_call_prepare(task);
4305         }
4306 }
4307
4308 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4309 {
4310         struct nfs4_unlockdata *calldata = data;
4311
4312         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4313                 return;
4314         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
4315                 /* Note: exit _without_ running nfs4_locku_done */
4316                 task->tk_action = NULL;
4317                 return;
4318         }
4319         calldata->timestamp = jiffies;
4320         if (nfs4_setup_sequence(calldata->server,
4321                                 &calldata->arg.seq_args,
4322                                 &calldata->res.seq_res, task))
4323                 return;
4324         rpc_call_start(task);
4325 }
4326
4327 static const struct rpc_call_ops nfs4_locku_ops = {
4328         .rpc_call_prepare = nfs4_locku_prepare,
4329         .rpc_call_done = nfs4_locku_done,
4330         .rpc_release = nfs4_locku_release_calldata,
4331 };
4332
4333 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4334                 struct nfs_open_context *ctx,
4335                 struct nfs4_lock_state *lsp,
4336                 struct nfs_seqid *seqid)
4337 {
4338         struct nfs4_unlockdata *data;
4339         struct rpc_message msg = {
4340                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4341                 .rpc_cred = ctx->cred,
4342         };
4343         struct rpc_task_setup task_setup_data = {
4344                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4345                 .rpc_message = &msg,
4346                 .callback_ops = &nfs4_locku_ops,
4347                 .workqueue = nfsiod_workqueue,
4348                 .flags = RPC_TASK_ASYNC,
4349         };
4350
4351         /* Ensure this is an unlock - when canceling a lock, the
4352          * canceled lock is passed in, and it won't be an unlock.
4353          */
4354         fl->fl_type = F_UNLCK;
4355
4356         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4357         if (data == NULL) {
4358                 nfs_free_seqid(seqid);
4359                 return ERR_PTR(-ENOMEM);
4360         }
4361
4362         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4363         msg.rpc_argp = &data->arg;
4364         msg.rpc_resp = &data->res;
4365         task_setup_data.callback_data = data;
4366         return rpc_run_task(&task_setup_data);
4367 }
4368
4369 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4370 {
4371         struct nfs_inode *nfsi = NFS_I(state->inode);
4372         struct nfs_seqid *seqid;
4373         struct nfs4_lock_state *lsp;
4374         struct rpc_task *task;
4375         int status = 0;
4376         unsigned char fl_flags = request->fl_flags;
4377
4378         status = nfs4_set_lock_state(state, request);
4379         /* Unlock _before_ we do the RPC call */
4380         request->fl_flags |= FL_EXISTS;
4381         down_read(&nfsi->rwsem);
4382         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4383                 up_read(&nfsi->rwsem);
4384                 goto out;
4385         }
4386         up_read(&nfsi->rwsem);
4387         if (status != 0)
4388                 goto out;
4389         /* Is this a delegated lock? */
4390         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4391                 goto out;
4392         lsp = request->fl_u.nfs4_fl.owner;
4393         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4394         status = -ENOMEM;
4395         if (seqid == NULL)
4396                 goto out;
4397         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4398         status = PTR_ERR(task);
4399         if (IS_ERR(task))
4400                 goto out;
4401         status = nfs4_wait_for_completion_rpc_task(task);
4402         rpc_put_task(task);
4403 out:
4404         request->fl_flags = fl_flags;
4405         return status;
4406 }
4407
4408 struct nfs4_lockdata {
4409         struct nfs_lock_args arg;
4410         struct nfs_lock_res res;
4411         struct nfs4_lock_state *lsp;
4412         struct nfs_open_context *ctx;
4413         struct file_lock fl;
4414         unsigned long timestamp;
4415         int rpc_status;
4416         int cancelled;
4417         struct nfs_server *server;
4418 };
4419
4420 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4421                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4422                 gfp_t gfp_mask)
4423 {
4424         struct nfs4_lockdata *p;
4425         struct inode *inode = lsp->ls_state->inode;
4426         struct nfs_server *server = NFS_SERVER(inode);
4427
4428         p = kzalloc(sizeof(*p), gfp_mask);
4429         if (p == NULL)
4430                 return NULL;
4431
4432         p->arg.fh = NFS_FH(inode);
4433         p->arg.fl = &p->fl;
4434         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4435         if (p->arg.open_seqid == NULL)
4436                 goto out_free;
4437         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4438         if (p->arg.lock_seqid == NULL)
4439                 goto out_free_seqid;
4440         p->arg.lock_stateid = &lsp->ls_stateid;
4441         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4442         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4443         p->arg.lock_owner.s_dev = server->s_dev;
4444         p->res.lock_seqid = p->arg.lock_seqid;
4445         p->lsp = lsp;
4446         p->server = server;
4447         atomic_inc(&lsp->ls_count);
4448         p->ctx = get_nfs_open_context(ctx);
4449         memcpy(&p->fl, fl, sizeof(p->fl));
4450         return p;
4451 out_free_seqid:
4452         nfs_free_seqid(p->arg.open_seqid);
4453 out_free:
4454         kfree(p);
4455         return NULL;
4456 }
4457
4458 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4459 {
4460         struct nfs4_lockdata *data = calldata;
4461         struct nfs4_state *state = data->lsp->ls_state;
4462
4463         dprintk("%s: begin!\n", __func__);
4464         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4465                 return;
4466         /* Do we need to do an open_to_lock_owner? */
4467         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4468                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4469                         return;
4470                 data->arg.open_stateid = &state->stateid;
4471                 data->arg.new_lock_owner = 1;
4472                 data->res.open_seqid = data->arg.open_seqid;
4473         } else
4474                 data->arg.new_lock_owner = 0;
4475         data->timestamp = jiffies;
4476         if (nfs4_setup_sequence(data->server,
4477                                 &data->arg.seq_args,
4478                                 &data->res.seq_res, task))
4479                 return;
4480         rpc_call_start(task);
4481         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4482 }
4483
4484 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4485 {
4486         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4487         nfs4_lock_prepare(task, calldata);
4488 }
4489
4490 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4491 {
4492         struct nfs4_lockdata *data = calldata;
4493
4494         dprintk("%s: begin!\n", __func__);
4495
4496         if (!nfs4_sequence_done(task, &data->res.seq_res))
4497                 return;
4498
4499         data->rpc_status = task->tk_status;
4500         if (data->arg.new_lock_owner != 0) {
4501                 if (data->rpc_status == 0)
4502                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4503                 else
4504                         goto out;
4505         }
4506         if (data->rpc_status == 0) {
4507                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4508                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4509                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4510         }
4511 out:
4512         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4513 }
4514
4515 static void nfs4_lock_release(void *calldata)
4516 {
4517         struct nfs4_lockdata *data = calldata;
4518
4519         dprintk("%s: begin!\n", __func__);
4520         nfs_free_seqid(data->arg.open_seqid);
4521         if (data->cancelled != 0) {
4522                 struct rpc_task *task;
4523                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4524                                 data->arg.lock_seqid);
4525                 if (!IS_ERR(task))
4526                         rpc_put_task_async(task);
4527                 dprintk("%s: cancelling lock!\n", __func__);
4528         } else
4529                 nfs_free_seqid(data->arg.lock_seqid);
4530         nfs4_put_lock_state(data->lsp);
4531         put_nfs_open_context(data->ctx);
4532         kfree(data);
4533         dprintk("%s: done!\n", __func__);
4534 }
4535
4536 static const struct rpc_call_ops nfs4_lock_ops = {
4537         .rpc_call_prepare = nfs4_lock_prepare,
4538         .rpc_call_done = nfs4_lock_done,
4539         .rpc_release = nfs4_lock_release,
4540 };
4541
4542 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4543         .rpc_call_prepare = nfs4_recover_lock_prepare,
4544         .rpc_call_done = nfs4_lock_done,
4545         .rpc_release = nfs4_lock_release,
4546 };
4547
4548 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4549 {
4550         switch (error) {
4551         case -NFS4ERR_ADMIN_REVOKED:
4552         case -NFS4ERR_BAD_STATEID:
4553                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4554                 if (new_lock_owner != 0 ||
4555                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4556                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4557                 break;
4558         case -NFS4ERR_STALE_STATEID:
4559                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4560         case -NFS4ERR_EXPIRED:
4561                 nfs4_schedule_lease_recovery(server->nfs_client);
4562         };
4563 }
4564
4565 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4566 {
4567         struct nfs4_lockdata *data;
4568         struct rpc_task *task;
4569         struct rpc_message msg = {
4570                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4571                 .rpc_cred = state->owner->so_cred,
4572         };
4573         struct rpc_task_setup task_setup_data = {
4574                 .rpc_client = NFS_CLIENT(state->inode),
4575                 .rpc_message = &msg,
4576                 .callback_ops = &nfs4_lock_ops,
4577                 .workqueue = nfsiod_workqueue,
4578                 .flags = RPC_TASK_ASYNC,
4579         };
4580         int ret;
4581
4582         dprintk("%s: begin!\n", __func__);
4583         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4584                         fl->fl_u.nfs4_fl.owner,
4585                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4586         if (data == NULL)
4587                 return -ENOMEM;
4588         if (IS_SETLKW(cmd))
4589                 data->arg.block = 1;
4590         if (recovery_type > NFS_LOCK_NEW) {
4591                 if (recovery_type == NFS_LOCK_RECLAIM)
4592                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4593                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4594         }
4595         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4596         msg.rpc_argp = &data->arg;
4597         msg.rpc_resp = &data->res;
4598         task_setup_data.callback_data = data;
4599         task = rpc_run_task(&task_setup_data);
4600         if (IS_ERR(task))
4601                 return PTR_ERR(task);
4602         ret = nfs4_wait_for_completion_rpc_task(task);
4603         if (ret == 0) {
4604                 ret = data->rpc_status;
4605                 if (ret)
4606                         nfs4_handle_setlk_error(data->server, data->lsp,
4607                                         data->arg.new_lock_owner, ret);
4608         } else
4609                 data->cancelled = 1;
4610         rpc_put_task(task);
4611         dprintk("%s: done, ret = %d!\n", __func__, ret);
4612         return ret;
4613 }
4614
4615 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4616 {
4617         struct nfs_server *server = NFS_SERVER(state->inode);
4618         struct nfs4_exception exception = {
4619                 .inode = state->inode,
4620         };
4621         int err;
4622
4623         do {
4624                 /* Cache the lock if possible... */
4625                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4626                         return 0;
4627                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4628                 if (err != -NFS4ERR_DELAY)
4629                         break;
4630                 nfs4_handle_exception(server, err, &exception);
4631         } while (exception.retry);
4632         return err;
4633 }
4634
4635 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4636 {
4637         struct nfs_server *server = NFS_SERVER(state->inode);
4638         struct nfs4_exception exception = {
4639                 .inode = state->inode,
4640         };
4641         int err;
4642
4643         err = nfs4_set_lock_state(state, request);
4644         if (err != 0)
4645                 return err;
4646         do {
4647                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4648                         return 0;
4649                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4650                 switch (err) {
4651                 default:
4652                         goto out;
4653                 case -NFS4ERR_GRACE:
4654                 case -NFS4ERR_DELAY:
4655                         nfs4_handle_exception(server, err, &exception);
4656                         err = 0;
4657                 }
4658         } while (exception.retry);
4659 out:
4660         return err;
4661 }
4662
4663 #if defined(CONFIG_NFS_V4_1)
4664 static int nfs41_check_expired_locks(struct nfs4_state *state)
4665 {
4666         int status, ret = NFS_OK;
4667         struct nfs4_lock_state *lsp;
4668         struct nfs_server *server = NFS_SERVER(state->inode);
4669
4670         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4671                 if (lsp->ls_flags & NFS_LOCK_INITIALIZED) {
4672                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4673                         if (status != NFS_OK) {
4674                                 nfs41_free_stateid(server, &lsp->ls_stateid);
4675                                 lsp->ls_flags &= ~NFS_LOCK_INITIALIZED;
4676                                 ret = status;
4677                         }
4678                 }
4679         };
4680
4681         return ret;
4682 }
4683
4684 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4685 {
4686         int status = NFS_OK;
4687
4688         if (test_bit(LK_STATE_IN_USE, &state->flags))
4689                 status = nfs41_check_expired_locks(state);
4690         if (status == NFS_OK)
4691                 return status;
4692         return nfs4_lock_expired(state, request);
4693 }
4694 #endif
4695
4696 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4697 {
4698         struct nfs_inode *nfsi = NFS_I(state->inode);
4699         unsigned char fl_flags = request->fl_flags;
4700         int status = -ENOLCK;
4701
4702         if ((fl_flags & FL_POSIX) &&
4703                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4704                 goto out;
4705         /* Is this a delegated open? */
4706         status = nfs4_set_lock_state(state, request);
4707         if (status != 0)
4708                 goto out;
4709         request->fl_flags |= FL_ACCESS;
4710         status = do_vfs_lock(request->fl_file, request);
4711         if (status < 0)
4712                 goto out;
4713         down_read(&nfsi->rwsem);
4714         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4715                 /* Yes: cache locks! */
4716                 /* ...but avoid races with delegation recall... */
4717                 request->fl_flags = fl_flags & ~FL_SLEEP;
4718                 status = do_vfs_lock(request->fl_file, request);
4719                 goto out_unlock;
4720         }
4721         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4722         if (status != 0)
4723                 goto out_unlock;
4724         /* Note: we always want to sleep here! */
4725         request->fl_flags = fl_flags | FL_SLEEP;
4726         if (do_vfs_lock(request->fl_file, request) < 0)
4727                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4728                         "manager!\n", __func__);
4729 out_unlock:
4730         up_read(&nfsi->rwsem);
4731 out:
4732         request->fl_flags = fl_flags;
4733         return status;
4734 }
4735
4736 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4737 {
4738         struct nfs4_exception exception = {
4739                 .state = state,
4740                 .inode = state->inode,
4741         };
4742         int err;
4743
4744         do {
4745                 err = _nfs4_proc_setlk(state, cmd, request);
4746                 if (err == -NFS4ERR_DENIED)
4747                         err = -EAGAIN;
4748                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4749                                 err, &exception);
4750         } while (exception.retry);
4751         return err;
4752 }
4753
4754 static int
4755 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4756 {
4757         struct nfs_open_context *ctx;
4758         struct nfs4_state *state;
4759         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4760         int status;
4761
4762         /* verify open state */
4763         ctx = nfs_file_open_context(filp);
4764         state = ctx->state;
4765
4766         if (request->fl_start < 0 || request->fl_end < 0)
4767                 return -EINVAL;
4768
4769         if (IS_GETLK(cmd)) {
4770                 if (state != NULL)
4771                         return nfs4_proc_getlk(state, F_GETLK, request);
4772                 return 0;
4773         }
4774
4775         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4776                 return -EINVAL;
4777
4778         if (request->fl_type == F_UNLCK) {
4779                 if (state != NULL)
4780                         return nfs4_proc_unlck(state, cmd, request);
4781                 return 0;
4782         }
4783
4784         if (state == NULL)
4785                 return -ENOLCK;
4786         /*
4787          * Don't rely on the VFS having checked the file open mode,
4788          * since it won't do this for flock() locks.
4789          */
4790         switch (request->fl_type & (F_RDLCK|F_WRLCK|F_UNLCK)) {
4791         case F_RDLCK:
4792                 if (!(filp->f_mode & FMODE_READ))
4793                         return -EBADF;
4794                 break;
4795         case F_WRLCK:
4796                 if (!(filp->f_mode & FMODE_WRITE))
4797                         return -EBADF;
4798         }
4799
4800         do {
4801                 status = nfs4_proc_setlk(state, cmd, request);
4802                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4803                         break;
4804                 timeout = nfs4_set_lock_task_retry(timeout);
4805                 status = -ERESTARTSYS;
4806                 if (signalled())
4807                         break;
4808         } while(status < 0);
4809         return status;
4810 }
4811
4812 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4813 {
4814         struct nfs_server *server = NFS_SERVER(state->inode);
4815         struct nfs4_exception exception = { };
4816         int err;
4817
4818         err = nfs4_set_lock_state(state, fl);
4819         if (err != 0)
4820                 goto out;
4821         do {
4822                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4823                 switch (err) {
4824                         default:
4825                                 printk(KERN_ERR "NFS: %s: unhandled error "
4826                                         "%d.\n", __func__, err);
4827                         case 0:
4828                         case -ESTALE:
4829                                 goto out;
4830                         case -NFS4ERR_EXPIRED:
4831                                 nfs4_schedule_stateid_recovery(server, state);
4832                         case -NFS4ERR_STALE_CLIENTID:
4833                         case -NFS4ERR_STALE_STATEID:
4834                                 nfs4_schedule_lease_recovery(server->nfs_client);
4835                                 goto out;
4836                         case -NFS4ERR_BADSESSION:
4837                         case -NFS4ERR_BADSLOT:
4838                         case -NFS4ERR_BAD_HIGH_SLOT:
4839                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4840                         case -NFS4ERR_DEADSESSION:
4841                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4842                                 goto out;
4843                         case -ERESTARTSYS:
4844                                 /*
4845                                  * The show must go on: exit, but mark the
4846                                  * stateid as needing recovery.
4847                                  */
4848                         case -NFS4ERR_DELEG_REVOKED:
4849                         case -NFS4ERR_ADMIN_REVOKED:
4850                         case -NFS4ERR_BAD_STATEID:
4851                         case -NFS4ERR_OPENMODE:
4852                                 nfs4_schedule_stateid_recovery(server, state);
4853                                 err = 0;
4854                                 goto out;
4855                         case -EKEYEXPIRED:
4856                                 /*
4857                                  * User RPCSEC_GSS context has expired.
4858                                  * We cannot recover this stateid now, so
4859                                  * skip it and allow recovery thread to
4860                                  * proceed.
4861                                  */
4862                                 err = 0;
4863                                 goto out;
4864                         case -ENOMEM:
4865                         case -NFS4ERR_DENIED:
4866                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4867                                 err = 0;
4868                                 goto out;
4869                         case -NFS4ERR_DELAY:
4870                                 break;
4871                 }
4872                 err = nfs4_handle_exception(server, err, &exception);
4873         } while (exception.retry);
4874 out:
4875         return err;
4876 }
4877
4878 struct nfs_release_lockowner_data {
4879         struct nfs4_lock_state *lsp;
4880         struct nfs_server *server;
4881         struct nfs_release_lockowner_args args;
4882 };
4883
4884 static void nfs4_release_lockowner_release(void *calldata)
4885 {
4886         struct nfs_release_lockowner_data *data = calldata;
4887         nfs4_free_lock_state(data->server, data->lsp);
4888         kfree(calldata);
4889 }
4890
4891 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
4892         .rpc_release = nfs4_release_lockowner_release,
4893 };
4894
4895 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
4896 {
4897         struct nfs_server *server = lsp->ls_state->owner->so_server;
4898         struct nfs_release_lockowner_data *data;
4899         struct rpc_message msg = {
4900                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4901         };
4902
4903         if (server->nfs_client->cl_mvops->minor_version != 0)
4904                 return -EINVAL;
4905         data = kmalloc(sizeof(*data), GFP_NOFS);
4906         if (!data)
4907                 return -ENOMEM;
4908         data->lsp = lsp;
4909         data->server = server;
4910         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
4911         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
4912         data->args.lock_owner.s_dev = server->s_dev;
4913         msg.rpc_argp = &data->args;
4914         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
4915         return 0;
4916 }
4917
4918 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4919
4920 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4921                                    const void *buf, size_t buflen,
4922                                    int flags, int type)
4923 {
4924         if (strcmp(key, "") != 0)
4925                 return -EINVAL;
4926
4927         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4928 }
4929
4930 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4931                                    void *buf, size_t buflen, int type)
4932 {
4933         if (strcmp(key, "") != 0)
4934                 return -EINVAL;
4935
4936         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4937 }
4938
4939 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4940                                        size_t list_len, const char *name,
4941                                        size_t name_len, int type)
4942 {
4943         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4944
4945         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4946                 return 0;
4947
4948         if (list && len <= list_len)
4949                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4950         return len;
4951 }
4952
4953 /*
4954  * nfs_fhget will use either the mounted_on_fileid or the fileid
4955  */
4956 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4957 {
4958         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
4959                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
4960               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4961               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
4962                 return;
4963
4964         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4965                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
4966         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4967         fattr->nlink = 2;
4968 }
4969
4970 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
4971                                    const struct qstr *name,
4972                                    struct nfs4_fs_locations *fs_locations,
4973                                    struct page *page)
4974 {
4975         struct nfs_server *server = NFS_SERVER(dir);
4976         u32 bitmask[2] = {
4977                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4978         };
4979         struct nfs4_fs_locations_arg args = {
4980                 .dir_fh = NFS_FH(dir),
4981                 .name = name,
4982                 .page = page,
4983                 .bitmask = bitmask,
4984         };
4985         struct nfs4_fs_locations_res res = {
4986                 .fs_locations = fs_locations,
4987         };
4988         struct rpc_message msg = {
4989                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4990                 .rpc_argp = &args,
4991                 .rpc_resp = &res,
4992         };
4993         int status;
4994
4995         dprintk("%s: start\n", __func__);
4996
4997         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
4998          * is not supported */
4999         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5000                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5001         else
5002                 bitmask[0] |= FATTR4_WORD0_FILEID;
5003
5004         nfs_fattr_init(&fs_locations->fattr);
5005         fs_locations->server = server;
5006         fs_locations->nlocations = 0;
5007         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5008         dprintk("%s: returned status = %d\n", __func__, status);
5009         return status;
5010 }
5011
5012 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5013                            const struct qstr *name,
5014                            struct nfs4_fs_locations *fs_locations,
5015                            struct page *page)
5016 {
5017         struct nfs4_exception exception = { };
5018         int err;
5019         do {
5020                 err = nfs4_handle_exception(NFS_SERVER(dir),
5021                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5022                                 &exception);
5023         } while (exception.retry);
5024         return err;
5025 }
5026
5027 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5028 {
5029         int status;
5030         struct nfs4_secinfo_arg args = {
5031                 .dir_fh = NFS_FH(dir),
5032                 .name   = name,
5033         };
5034         struct nfs4_secinfo_res res = {
5035                 .flavors     = flavors,
5036         };
5037         struct rpc_message msg = {
5038                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5039                 .rpc_argp = &args,
5040                 .rpc_resp = &res,
5041         };
5042
5043         dprintk("NFS call  secinfo %s\n", name->name);
5044         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5045         dprintk("NFS reply  secinfo: %d\n", status);
5046         return status;
5047 }
5048
5049 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5050                       struct nfs4_secinfo_flavors *flavors)
5051 {
5052         struct nfs4_exception exception = { };
5053         int err;
5054         do {
5055                 err = nfs4_handle_exception(NFS_SERVER(dir),
5056                                 _nfs4_proc_secinfo(dir, name, flavors),
5057                                 &exception);
5058         } while (exception.retry);
5059         return err;
5060 }
5061
5062 #ifdef CONFIG_NFS_V4_1
5063 /*
5064  * Check the exchange flags returned by the server for invalid flags, having
5065  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5066  * DS flags set.
5067  */
5068 static int nfs4_check_cl_exchange_flags(u32 flags)
5069 {
5070         if (flags & ~EXCHGID4_FLAG_MASK_R)
5071                 goto out_inval;
5072         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5073             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5074                 goto out_inval;
5075         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5076                 goto out_inval;
5077         return NFS_OK;
5078 out_inval:
5079         return -NFS4ERR_INVAL;
5080 }
5081
5082 static bool
5083 nfs41_same_server_scope(struct server_scope *a, struct server_scope *b)
5084 {
5085         if (a->server_scope_sz == b->server_scope_sz &&
5086             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5087                 return true;
5088
5089         return false;
5090 }
5091
5092 /*
5093  * nfs4_proc_exchange_id()
5094  *
5095  * Since the clientid has expired, all compounds using sessions
5096  * associated with the stale clientid will be returning
5097  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5098  * be in some phase of session reset.
5099  */
5100 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5101 {
5102         nfs4_verifier verifier;
5103         struct nfs41_exchange_id_args args = {
5104                 .verifier = &verifier,
5105                 .client = clp,
5106                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5107         };
5108         struct nfs41_exchange_id_res res = {
5109                 .client = clp,
5110         };
5111         int status;
5112         struct rpc_message msg = {
5113                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5114                 .rpc_argp = &args,
5115                 .rpc_resp = &res,
5116                 .rpc_cred = cred,
5117         };
5118
5119         dprintk("--> %s\n", __func__);
5120         BUG_ON(clp == NULL);
5121
5122         nfs4_construct_boot_verifier(clp, &verifier);
5123
5124         args.id_len = scnprintf(args.id, sizeof(args.id),
5125                                 "%s/%s.%s/%u",
5126                                 clp->cl_ipaddr,
5127                                 init_utsname()->nodename,
5128                                 init_utsname()->domainname,
5129                                 clp->cl_rpcclient->cl_auth->au_flavor);
5130
5131         res.server_scope = kzalloc(sizeof(struct server_scope), GFP_KERNEL);
5132         if (unlikely(!res.server_scope)) {
5133                 status = -ENOMEM;
5134                 goto out;
5135         }
5136
5137         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_KERNEL);
5138         if (unlikely(!res.impl_id)) {
5139                 status = -ENOMEM;
5140                 goto out_server_scope;
5141         }
5142
5143         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5144         if (!status)
5145                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
5146
5147         if (!status) {
5148                 /* use the most recent implementation id */
5149                 kfree(clp->impl_id);
5150                 clp->impl_id = res.impl_id;
5151         } else
5152                 kfree(res.impl_id);
5153
5154         if (!status) {
5155                 if (clp->server_scope &&
5156                     !nfs41_same_server_scope(clp->server_scope,
5157                                              res.server_scope)) {
5158                         dprintk("%s: server_scope mismatch detected\n",
5159                                 __func__);
5160                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5161                         kfree(clp->server_scope);
5162                         clp->server_scope = NULL;
5163                 }
5164
5165                 if (!clp->server_scope) {
5166                         clp->server_scope = res.server_scope;
5167                         goto out;
5168                 }
5169         }
5170
5171 out_server_scope:
5172         kfree(res.server_scope);
5173 out:
5174         if (clp->impl_id)
5175                 dprintk("%s: Server Implementation ID: "
5176                         "domain: %s, name: %s, date: %llu,%u\n",
5177                         __func__, clp->impl_id->domain, clp->impl_id->name,
5178                         clp->impl_id->date.seconds,
5179                         clp->impl_id->date.nseconds);
5180         dprintk("<-- %s status= %d\n", __func__, status);
5181         return status;
5182 }
5183
5184 struct nfs4_get_lease_time_data {
5185         struct nfs4_get_lease_time_args *args;
5186         struct nfs4_get_lease_time_res *res;
5187         struct nfs_client *clp;
5188 };
5189
5190 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5191                                         void *calldata)
5192 {
5193         int ret;
5194         struct nfs4_get_lease_time_data *data =
5195                         (struct nfs4_get_lease_time_data *)calldata;
5196
5197         dprintk("--> %s\n", __func__);
5198         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5199         /* just setup sequence, do not trigger session recovery
5200            since we're invoked within one */
5201         ret = nfs41_setup_sequence(data->clp->cl_session,
5202                                    &data->args->la_seq_args,
5203                                    &data->res->lr_seq_res, task);
5204
5205         BUG_ON(ret == -EAGAIN);
5206         rpc_call_start(task);
5207         dprintk("<-- %s\n", __func__);
5208 }
5209
5210 /*
5211  * Called from nfs4_state_manager thread for session setup, so don't recover
5212  * from sequence operation or clientid errors.
5213  */
5214 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5215 {
5216         struct nfs4_get_lease_time_data *data =
5217                         (struct nfs4_get_lease_time_data *)calldata;
5218
5219         dprintk("--> %s\n", __func__);
5220         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5221                 return;
5222         switch (task->tk_status) {
5223         case -NFS4ERR_DELAY:
5224         case -NFS4ERR_GRACE:
5225                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5226                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5227                 task->tk_status = 0;
5228                 /* fall through */
5229         case -NFS4ERR_RETRY_UNCACHED_REP:
5230                 rpc_restart_call_prepare(task);
5231                 return;
5232         }
5233         dprintk("<-- %s\n", __func__);
5234 }
5235
5236 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5237         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5238         .rpc_call_done = nfs4_get_lease_time_done,
5239 };
5240
5241 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5242 {
5243         struct rpc_task *task;
5244         struct nfs4_get_lease_time_args args;
5245         struct nfs4_get_lease_time_res res = {
5246                 .lr_fsinfo = fsinfo,
5247         };
5248         struct nfs4_get_lease_time_data data = {
5249                 .args = &args,
5250                 .res = &res,
5251                 .clp = clp,
5252         };
5253         struct rpc_message msg = {
5254                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5255                 .rpc_argp = &args,
5256                 .rpc_resp = &res,
5257         };
5258         struct rpc_task_setup task_setup = {
5259                 .rpc_client = clp->cl_rpcclient,
5260                 .rpc_message = &msg,
5261                 .callback_ops = &nfs4_get_lease_time_ops,
5262                 .callback_data = &data,
5263                 .flags = RPC_TASK_TIMEOUT,
5264         };
5265         int status;
5266
5267         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5268         dprintk("--> %s\n", __func__);
5269         task = rpc_run_task(&task_setup);
5270
5271         if (IS_ERR(task))
5272                 status = PTR_ERR(task);
5273         else {
5274                 status = task->tk_status;
5275                 rpc_put_task(task);
5276         }
5277         dprintk("<-- %s return %d\n", __func__, status);
5278
5279         return status;
5280 }
5281
5282 static struct nfs4_slot *nfs4_alloc_slots(u32 max_slots, gfp_t gfp_flags)
5283 {
5284         return kcalloc(max_slots, sizeof(struct nfs4_slot), gfp_flags);
5285 }
5286
5287 static void nfs4_add_and_init_slots(struct nfs4_slot_table *tbl,
5288                 struct nfs4_slot *new,
5289                 u32 max_slots,
5290                 u32 ivalue)
5291 {
5292         struct nfs4_slot *old = NULL;
5293         u32 i;
5294
5295         spin_lock(&tbl->slot_tbl_lock);
5296         if (new) {
5297                 old = tbl->slots;
5298                 tbl->slots = new;
5299                 tbl->max_slots = max_slots;
5300         }
5301         tbl->highest_used_slotid = -1;  /* no slot is currently used */
5302         for (i = 0; i < tbl->max_slots; i++)
5303                 tbl->slots[i].seq_nr = ivalue;
5304         spin_unlock(&tbl->slot_tbl_lock);
5305         kfree(old);
5306 }
5307
5308 /*
5309  * (re)Initialise a slot table
5310  */
5311 static int nfs4_realloc_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
5312                                  u32 ivalue)
5313 {
5314         struct nfs4_slot *new = NULL;
5315         int ret = -ENOMEM;
5316
5317         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
5318                 max_reqs, tbl->max_slots);
5319
5320         /* Does the newly negotiated max_reqs match the existing slot table? */
5321         if (max_reqs != tbl->max_slots) {
5322                 new = nfs4_alloc_slots(max_reqs, GFP_NOFS);
5323                 if (!new)
5324                         goto out;
5325         }
5326         ret = 0;
5327
5328         nfs4_add_and_init_slots(tbl, new, max_reqs, ivalue);
5329         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
5330                 tbl, tbl->slots, tbl->max_slots);
5331 out:
5332         dprintk("<-- %s: return %d\n", __func__, ret);
5333         return ret;
5334 }
5335
5336 /* Destroy the slot table */
5337 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
5338 {
5339         if (session->fc_slot_table.slots != NULL) {
5340                 kfree(session->fc_slot_table.slots);
5341                 session->fc_slot_table.slots = NULL;
5342         }
5343         if (session->bc_slot_table.slots != NULL) {
5344                 kfree(session->bc_slot_table.slots);
5345                 session->bc_slot_table.slots = NULL;
5346         }
5347         return;
5348 }
5349
5350 /*
5351  * Initialize or reset the forechannel and backchannel tables
5352  */
5353 static int nfs4_setup_session_slot_tables(struct nfs4_session *ses)
5354 {
5355         struct nfs4_slot_table *tbl;
5356         int status;
5357
5358         dprintk("--> %s\n", __func__);
5359         /* Fore channel */
5360         tbl = &ses->fc_slot_table;
5361         status = nfs4_realloc_slot_table(tbl, ses->fc_attrs.max_reqs, 1);
5362         if (status) /* -ENOMEM */
5363                 return status;
5364         /* Back channel */
5365         tbl = &ses->bc_slot_table;
5366         status = nfs4_realloc_slot_table(tbl, ses->bc_attrs.max_reqs, 0);
5367         if (status && tbl->slots == NULL)
5368                 /* Fore and back channel share a connection so get
5369                  * both slot tables or neither */
5370                 nfs4_destroy_slot_tables(ses);
5371         return status;
5372 }
5373
5374 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
5375 {
5376         struct nfs4_session *session;
5377         struct nfs4_slot_table *tbl;
5378
5379         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5380         if (!session)
5381                 return NULL;
5382
5383         tbl = &session->fc_slot_table;
5384         tbl->highest_used_slotid = NFS4_NO_SLOT;
5385         spin_lock_init(&tbl->slot_tbl_lock);
5386         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
5387         init_completion(&tbl->complete);
5388
5389         tbl = &session->bc_slot_table;
5390         tbl->highest_used_slotid = NFS4_NO_SLOT;
5391         spin_lock_init(&tbl->slot_tbl_lock);
5392         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
5393         init_completion(&tbl->complete);
5394
5395         session->session_state = 1<<NFS4_SESSION_INITING;
5396
5397         session->clp = clp;
5398         return session;
5399 }
5400
5401 void nfs4_destroy_session(struct nfs4_session *session)
5402 {
5403         struct rpc_xprt *xprt;
5404
5405         nfs4_proc_destroy_session(session);
5406
5407         rcu_read_lock();
5408         xprt = rcu_dereference(session->clp->cl_rpcclient->cl_xprt);
5409         rcu_read_unlock();
5410         dprintk("%s Destroy backchannel for xprt %p\n",
5411                 __func__, xprt);
5412         xprt_destroy_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
5413         nfs4_destroy_slot_tables(session);
5414         kfree(session);
5415 }
5416
5417 /*
5418  * Initialize the values to be used by the client in CREATE_SESSION
5419  * If nfs4_init_session set the fore channel request and response sizes,
5420  * use them.
5421  *
5422  * Set the back channel max_resp_sz_cached to zero to force the client to
5423  * always set csa_cachethis to FALSE because the current implementation
5424  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5425  */
5426 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5427 {
5428         struct nfs4_session *session = args->client->cl_session;
5429         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
5430                      mxresp_sz = session->fc_attrs.max_resp_sz;
5431
5432         if (mxrqst_sz == 0)
5433                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5434         if (mxresp_sz == 0)
5435                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5436         /* Fore channel attributes */
5437         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5438         args->fc_attrs.max_resp_sz = mxresp_sz;
5439         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5440         args->fc_attrs.max_reqs = max_session_slots;
5441
5442         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5443                 "max_ops=%u max_reqs=%u\n",
5444                 __func__,
5445                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5446                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5447
5448         /* Back channel attributes */
5449         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5450         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5451         args->bc_attrs.max_resp_sz_cached = 0;
5452         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5453         args->bc_attrs.max_reqs = 1;
5454
5455         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5456                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5457                 __func__,
5458                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5459                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5460                 args->bc_attrs.max_reqs);
5461 }
5462
5463 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5464 {
5465         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5466         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5467
5468         if (rcvd->max_resp_sz > sent->max_resp_sz)
5469                 return -EINVAL;
5470         /*
5471          * Our requested max_ops is the minimum we need; we're not
5472          * prepared to break up compounds into smaller pieces than that.
5473          * So, no point even trying to continue if the server won't
5474          * cooperate:
5475          */
5476         if (rcvd->max_ops < sent->max_ops)
5477                 return -EINVAL;
5478         if (rcvd->max_reqs == 0)
5479                 return -EINVAL;
5480         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5481                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5482         return 0;
5483 }
5484
5485 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5486 {
5487         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5488         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5489
5490         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5491                 return -EINVAL;
5492         if (rcvd->max_resp_sz < sent->max_resp_sz)
5493                 return -EINVAL;
5494         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5495                 return -EINVAL;
5496         /* These would render the backchannel useless: */
5497         if (rcvd->max_ops != sent->max_ops)
5498                 return -EINVAL;
5499         if (rcvd->max_reqs != sent->max_reqs)
5500                 return -EINVAL;
5501         return 0;
5502 }
5503
5504 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5505                                      struct nfs4_session *session)
5506 {
5507         int ret;
5508
5509         ret = nfs4_verify_fore_channel_attrs(args, session);
5510         if (ret)
5511                 return ret;
5512         return nfs4_verify_back_channel_attrs(args, session);
5513 }
5514
5515 static int _nfs4_proc_create_session(struct nfs_client *clp)
5516 {
5517         struct nfs4_session *session = clp->cl_session;
5518         struct nfs41_create_session_args args = {
5519                 .client = clp,
5520                 .cb_program = NFS4_CALLBACK,
5521         };
5522         struct nfs41_create_session_res res = {
5523                 .client = clp,
5524         };
5525         struct rpc_message msg = {
5526                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5527                 .rpc_argp = &args,
5528                 .rpc_resp = &res,
5529         };
5530         int status;
5531
5532         nfs4_init_channel_attrs(&args);
5533         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5534
5535         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5536
5537         if (!status)
5538                 /* Verify the session's negotiated channel_attrs values */
5539                 status = nfs4_verify_channel_attrs(&args, session);
5540         if (!status) {
5541                 /* Increment the clientid slot sequence id */
5542                 clp->cl_seqid++;
5543         }
5544
5545         return status;
5546 }
5547
5548 /*
5549  * Issues a CREATE_SESSION operation to the server.
5550  * It is the responsibility of the caller to verify the session is
5551  * expired before calling this routine.
5552  */
5553 int nfs4_proc_create_session(struct nfs_client *clp)
5554 {
5555         int status;
5556         unsigned *ptr;
5557         struct nfs4_session *session = clp->cl_session;
5558
5559         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5560
5561         status = _nfs4_proc_create_session(clp);
5562         if (status)
5563                 goto out;
5564
5565         /* Init or reset the session slot tables */
5566         status = nfs4_setup_session_slot_tables(session);
5567         dprintk("slot table setup returned %d\n", status);
5568         if (status)
5569                 goto out;
5570
5571         ptr = (unsigned *)&session->sess_id.data[0];
5572         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5573                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5574 out:
5575         dprintk("<-- %s\n", __func__);
5576         return status;
5577 }
5578
5579 /*
5580  * Issue the over-the-wire RPC DESTROY_SESSION.
5581  * The caller must serialize access to this routine.
5582  */
5583 int nfs4_proc_destroy_session(struct nfs4_session *session)
5584 {
5585         int status = 0;
5586         struct rpc_message msg;
5587
5588         dprintk("--> nfs4_proc_destroy_session\n");
5589
5590         /* session is still being setup */
5591         if (session->clp->cl_cons_state != NFS_CS_READY)
5592                 return status;
5593
5594         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5595         msg.rpc_argp = session;
5596         msg.rpc_resp = NULL;
5597         msg.rpc_cred = NULL;
5598         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5599
5600         if (status)
5601                 printk(KERN_WARNING
5602                         "NFS: Got error %d from the server on DESTROY_SESSION. "
5603                         "Session has been destroyed regardless...\n", status);
5604
5605         dprintk("<-- nfs4_proc_destroy_session\n");
5606         return status;
5607 }
5608
5609 int nfs4_init_session(struct nfs_server *server)
5610 {
5611         struct nfs_client *clp = server->nfs_client;
5612         struct nfs4_session *session;
5613         unsigned int rsize, wsize;
5614         int ret;
5615
5616         if (!nfs4_has_session(clp))
5617                 return 0;
5618
5619         session = clp->cl_session;
5620         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5621                 return 0;
5622
5623         rsize = server->rsize;
5624         if (rsize == 0)
5625                 rsize = NFS_MAX_FILE_IO_SIZE;
5626         wsize = server->wsize;
5627         if (wsize == 0)
5628                 wsize = NFS_MAX_FILE_IO_SIZE;
5629
5630         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5631         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5632
5633         ret = nfs4_recover_expired_lease(server);
5634         if (!ret)
5635                 ret = nfs4_check_client_ready(clp);
5636         return ret;
5637 }
5638
5639 int nfs4_init_ds_session(struct nfs_client *clp)
5640 {
5641         struct nfs4_session *session = clp->cl_session;
5642         int ret;
5643
5644         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5645                 return 0;
5646
5647         ret = nfs4_client_recover_expired_lease(clp);
5648         if (!ret)
5649                 /* Test for the DS role */
5650                 if (!is_ds_client(clp))
5651                         ret = -ENODEV;
5652         if (!ret)
5653                 ret = nfs4_check_client_ready(clp);
5654         return ret;
5655
5656 }
5657 EXPORT_SYMBOL_GPL(nfs4_init_ds_session);
5658
5659
5660 /*
5661  * Renew the cl_session lease.
5662  */
5663 struct nfs4_sequence_data {
5664         struct nfs_client *clp;
5665         struct nfs4_sequence_args args;
5666         struct nfs4_sequence_res res;
5667 };
5668
5669 static void nfs41_sequence_release(void *data)
5670 {
5671         struct nfs4_sequence_data *calldata = data;
5672         struct nfs_client *clp = calldata->clp;
5673
5674         if (atomic_read(&clp->cl_count) > 1)
5675                 nfs4_schedule_state_renewal(clp);
5676         nfs_put_client(clp);
5677         kfree(calldata);
5678 }
5679
5680 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5681 {
5682         switch(task->tk_status) {
5683         case -NFS4ERR_DELAY:
5684                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5685                 return -EAGAIN;
5686         default:
5687                 nfs4_schedule_lease_recovery(clp);
5688         }
5689         return 0;
5690 }
5691
5692 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5693 {
5694         struct nfs4_sequence_data *calldata = data;
5695         struct nfs_client *clp = calldata->clp;
5696
5697         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5698                 return;
5699
5700         if (task->tk_status < 0) {
5701                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5702                 if (atomic_read(&clp->cl_count) == 1)
5703                         goto out;
5704
5705                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5706                         rpc_restart_call_prepare(task);
5707                         return;
5708                 }
5709         }
5710         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5711 out:
5712         dprintk("<-- %s\n", __func__);
5713 }
5714
5715 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5716 {
5717         struct nfs4_sequence_data *calldata = data;
5718         struct nfs_client *clp = calldata->clp;
5719         struct nfs4_sequence_args *args;
5720         struct nfs4_sequence_res *res;
5721
5722         args = task->tk_msg.rpc_argp;
5723         res = task->tk_msg.rpc_resp;
5724
5725         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5726                 return;
5727         rpc_call_start(task);
5728 }
5729
5730 static const struct rpc_call_ops nfs41_sequence_ops = {
5731         .rpc_call_done = nfs41_sequence_call_done,
5732         .rpc_call_prepare = nfs41_sequence_prepare,
5733         .rpc_release = nfs41_sequence_release,
5734 };
5735
5736 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5737 {
5738         struct nfs4_sequence_data *calldata;
5739         struct rpc_message msg = {
5740                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5741                 .rpc_cred = cred,
5742         };
5743         struct rpc_task_setup task_setup_data = {
5744                 .rpc_client = clp->cl_rpcclient,
5745                 .rpc_message = &msg,
5746                 .callback_ops = &nfs41_sequence_ops,
5747                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5748         };
5749
5750         if (!atomic_inc_not_zero(&clp->cl_count))
5751                 return ERR_PTR(-EIO);
5752         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5753         if (calldata == NULL) {
5754                 nfs_put_client(clp);
5755                 return ERR_PTR(-ENOMEM);
5756         }
5757         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5758         msg.rpc_argp = &calldata->args;
5759         msg.rpc_resp = &calldata->res;
5760         calldata->clp = clp;
5761         task_setup_data.callback_data = calldata;
5762
5763         return rpc_run_task(&task_setup_data);
5764 }
5765
5766 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5767 {
5768         struct rpc_task *task;
5769         int ret = 0;
5770
5771         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5772                 return 0;
5773         task = _nfs41_proc_sequence(clp, cred);
5774         if (IS_ERR(task))
5775                 ret = PTR_ERR(task);
5776         else
5777                 rpc_put_task_async(task);
5778         dprintk("<-- %s status=%d\n", __func__, ret);
5779         return ret;
5780 }
5781
5782 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5783 {
5784         struct rpc_task *task;
5785         int ret;
5786
5787         task = _nfs41_proc_sequence(clp, cred);
5788         if (IS_ERR(task)) {
5789                 ret = PTR_ERR(task);
5790                 goto out;
5791         }
5792         ret = rpc_wait_for_completion_task(task);
5793         if (!ret) {
5794                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5795
5796                 if (task->tk_status == 0)
5797                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5798                 ret = task->tk_status;
5799         }
5800         rpc_put_task(task);
5801 out:
5802         dprintk("<-- %s status=%d\n", __func__, ret);
5803         return ret;
5804 }
5805
5806 struct nfs4_reclaim_complete_data {
5807         struct nfs_client *clp;
5808         struct nfs41_reclaim_complete_args arg;
5809         struct nfs41_reclaim_complete_res res;
5810 };
5811
5812 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5813 {
5814         struct nfs4_reclaim_complete_data *calldata = data;
5815
5816         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5817         if (nfs41_setup_sequence(calldata->clp->cl_session,
5818                                 &calldata->arg.seq_args,
5819                                 &calldata->res.seq_res, task))
5820                 return;
5821
5822         rpc_call_start(task);
5823 }
5824
5825 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5826 {
5827         switch(task->tk_status) {
5828         case 0:
5829         case -NFS4ERR_COMPLETE_ALREADY:
5830         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5831                 break;
5832         case -NFS4ERR_DELAY:
5833                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5834                 /* fall through */
5835         case -NFS4ERR_RETRY_UNCACHED_REP:
5836                 return -EAGAIN;
5837         default:
5838                 nfs4_schedule_lease_recovery(clp);
5839         }
5840         return 0;
5841 }
5842
5843 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5844 {
5845         struct nfs4_reclaim_complete_data *calldata = data;
5846         struct nfs_client *clp = calldata->clp;
5847         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5848
5849         dprintk("--> %s\n", __func__);
5850         if (!nfs41_sequence_done(task, res))
5851                 return;
5852
5853         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5854                 rpc_restart_call_prepare(task);
5855                 return;
5856         }
5857         dprintk("<-- %s\n", __func__);
5858 }
5859
5860 static void nfs4_free_reclaim_complete_data(void *data)
5861 {
5862         struct nfs4_reclaim_complete_data *calldata = data;
5863
5864         kfree(calldata);
5865 }
5866
5867 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5868         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5869         .rpc_call_done = nfs4_reclaim_complete_done,
5870         .rpc_release = nfs4_free_reclaim_complete_data,
5871 };
5872
5873 /*
5874  * Issue a global reclaim complete.
5875  */
5876 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5877 {
5878         struct nfs4_reclaim_complete_data *calldata;
5879         struct rpc_task *task;
5880         struct rpc_message msg = {
5881                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5882         };
5883         struct rpc_task_setup task_setup_data = {
5884                 .rpc_client = clp->cl_rpcclient,
5885                 .rpc_message = &msg,
5886                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5887                 .flags = RPC_TASK_ASYNC,
5888         };
5889         int status = -ENOMEM;
5890
5891         dprintk("--> %s\n", __func__);
5892         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5893         if (calldata == NULL)
5894                 goto out;
5895         calldata->clp = clp;
5896         calldata->arg.one_fs = 0;
5897
5898         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5899         msg.rpc_argp = &calldata->arg;
5900         msg.rpc_resp = &calldata->res;
5901         task_setup_data.callback_data = calldata;
5902         task = rpc_run_task(&task_setup_data);
5903         if (IS_ERR(task)) {
5904                 status = PTR_ERR(task);
5905                 goto out;
5906         }
5907         status = nfs4_wait_for_completion_rpc_task(task);
5908         if (status == 0)
5909                 status = task->tk_status;
5910         rpc_put_task(task);
5911         return 0;
5912 out:
5913         dprintk("<-- %s status=%d\n", __func__, status);
5914         return status;
5915 }
5916
5917 static void
5918 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5919 {
5920         struct nfs4_layoutget *lgp = calldata;
5921         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5922
5923         dprintk("--> %s\n", __func__);
5924         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5925          * right now covering the LAYOUTGET we are about to send.
5926          * However, that is not so catastrophic, and there seems
5927          * to be no way to prevent it completely.
5928          */
5929         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5930                                 &lgp->res.seq_res, task))
5931                 return;
5932         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5933                                           NFS_I(lgp->args.inode)->layout,
5934                                           lgp->args.ctx->state)) {
5935                 rpc_exit(task, NFS4_OK);
5936                 return;
5937         }
5938         rpc_call_start(task);
5939 }
5940
5941 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5942 {
5943         struct nfs4_layoutget *lgp = calldata;
5944         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5945
5946         dprintk("--> %s\n", __func__);
5947
5948         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5949                 return;
5950
5951         switch (task->tk_status) {
5952         case 0:
5953                 break;
5954         case -NFS4ERR_LAYOUTTRYLATER:
5955         case -NFS4ERR_RECALLCONFLICT:
5956                 task->tk_status = -NFS4ERR_DELAY;
5957                 /* Fall through */
5958         default:
5959                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5960                         rpc_restart_call_prepare(task);
5961                         return;
5962                 }
5963         }
5964         dprintk("<-- %s\n", __func__);
5965 }
5966
5967 static void nfs4_layoutget_release(void *calldata)
5968 {
5969         struct nfs4_layoutget *lgp = calldata;
5970
5971         dprintk("--> %s\n", __func__);
5972         put_nfs_open_context(lgp->args.ctx);
5973         kfree(calldata);
5974         dprintk("<-- %s\n", __func__);
5975 }
5976
5977 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5978         .rpc_call_prepare = nfs4_layoutget_prepare,
5979         .rpc_call_done = nfs4_layoutget_done,
5980         .rpc_release = nfs4_layoutget_release,
5981 };
5982
5983 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5984 {
5985         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5986         struct rpc_task *task;
5987         struct rpc_message msg = {
5988                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5989                 .rpc_argp = &lgp->args,
5990                 .rpc_resp = &lgp->res,
5991         };
5992         struct rpc_task_setup task_setup_data = {
5993                 .rpc_client = server->client,
5994                 .rpc_message = &msg,
5995                 .callback_ops = &nfs4_layoutget_call_ops,
5996                 .callback_data = lgp,
5997                 .flags = RPC_TASK_ASYNC,
5998         };
5999         int status = 0;
6000
6001         dprintk("--> %s\n", __func__);
6002
6003         lgp->res.layoutp = &lgp->args.layout;
6004         lgp->res.seq_res.sr_slot = NULL;
6005         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6006         task = rpc_run_task(&task_setup_data);
6007         if (IS_ERR(task))
6008                 return PTR_ERR(task);
6009         status = nfs4_wait_for_completion_rpc_task(task);
6010         if (status == 0)
6011                 status = task->tk_status;
6012         if (status == 0)
6013                 status = pnfs_layout_process(lgp);
6014         rpc_put_task(task);
6015         dprintk("<-- %s status=%d\n", __func__, status);
6016         return status;
6017 }
6018
6019 static void
6020 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6021 {
6022         struct nfs4_layoutreturn *lrp = calldata;
6023
6024         dprintk("--> %s\n", __func__);
6025         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6026                                 &lrp->res.seq_res, task))
6027                 return;
6028         rpc_call_start(task);
6029 }
6030
6031 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6032 {
6033         struct nfs4_layoutreturn *lrp = calldata;
6034         struct nfs_server *server;
6035         struct pnfs_layout_hdr *lo = lrp->args.layout;
6036
6037         dprintk("--> %s\n", __func__);
6038
6039         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6040                 return;
6041
6042         server = NFS_SERVER(lrp->args.inode);
6043         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6044                 rpc_restart_call_prepare(task);
6045                 return;
6046         }
6047         spin_lock(&lo->plh_inode->i_lock);
6048         if (task->tk_status == 0) {
6049                 if (lrp->res.lrs_present) {
6050                         pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6051                 } else
6052                         BUG_ON(!list_empty(&lo->plh_segs));
6053         }
6054         lo->plh_block_lgets--;
6055         spin_unlock(&lo->plh_inode->i_lock);
6056         dprintk("<-- %s\n", __func__);
6057 }
6058
6059 static void nfs4_layoutreturn_release(void *calldata)
6060 {
6061         struct nfs4_layoutreturn *lrp = calldata;
6062
6063         dprintk("--> %s\n", __func__);
6064         put_layout_hdr(lrp->args.layout);
6065         kfree(calldata);
6066         dprintk("<-- %s\n", __func__);
6067 }
6068
6069 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6070         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6071         .rpc_call_done = nfs4_layoutreturn_done,
6072         .rpc_release = nfs4_layoutreturn_release,
6073 };
6074
6075 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6076 {
6077         struct rpc_task *task;
6078         struct rpc_message msg = {
6079                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6080                 .rpc_argp = &lrp->args,
6081                 .rpc_resp = &lrp->res,
6082         };
6083         struct rpc_task_setup task_setup_data = {
6084                 .rpc_client = lrp->clp->cl_rpcclient,
6085                 .rpc_message = &msg,
6086                 .callback_ops = &nfs4_layoutreturn_call_ops,
6087                 .callback_data = lrp,
6088         };
6089         int status;
6090
6091         dprintk("--> %s\n", __func__);
6092         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6093         task = rpc_run_task(&task_setup_data);
6094         if (IS_ERR(task))
6095                 return PTR_ERR(task);
6096         status = task->tk_status;
6097         dprintk("<-- %s status=%d\n", __func__, status);
6098         rpc_put_task(task);
6099         return status;
6100 }
6101
6102 /*
6103  * Retrieve the list of Data Server devices from the MDS.
6104  */
6105 static int _nfs4_getdevicelist(struct nfs_server *server,
6106                                     const struct nfs_fh *fh,
6107                                     struct pnfs_devicelist *devlist)
6108 {
6109         struct nfs4_getdevicelist_args args = {
6110                 .fh = fh,
6111                 .layoutclass = server->pnfs_curr_ld->id,
6112         };
6113         struct nfs4_getdevicelist_res res = {
6114                 .devlist = devlist,
6115         };
6116         struct rpc_message msg = {
6117                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6118                 .rpc_argp = &args,
6119                 .rpc_resp = &res,
6120         };
6121         int status;
6122
6123         dprintk("--> %s\n", __func__);
6124         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6125                                 &res.seq_res, 0);
6126         dprintk("<-- %s status=%d\n", __func__, status);
6127         return status;
6128 }
6129
6130 int nfs4_proc_getdevicelist(struct nfs_server *server,
6131                             const struct nfs_fh *fh,
6132                             struct pnfs_devicelist *devlist)
6133 {
6134         struct nfs4_exception exception = { };
6135         int err;
6136
6137         do {
6138                 err = nfs4_handle_exception(server,
6139                                 _nfs4_getdevicelist(server, fh, devlist),
6140                                 &exception);
6141         } while (exception.retry);
6142
6143         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6144                 err, devlist->num_devs);
6145
6146         return err;
6147 }
6148 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6149
6150 static int
6151 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6152 {
6153         struct nfs4_getdeviceinfo_args args = {
6154                 .pdev = pdev,
6155         };
6156         struct nfs4_getdeviceinfo_res res = {
6157                 .pdev = pdev,
6158         };
6159         struct rpc_message msg = {
6160                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6161                 .rpc_argp = &args,
6162                 .rpc_resp = &res,
6163         };
6164         int status;
6165
6166         dprintk("--> %s\n", __func__);
6167         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6168         dprintk("<-- %s status=%d\n", __func__, status);
6169
6170         return status;
6171 }
6172
6173 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6174 {
6175         struct nfs4_exception exception = { };
6176         int err;
6177
6178         do {
6179                 err = nfs4_handle_exception(server,
6180                                         _nfs4_proc_getdeviceinfo(server, pdev),
6181                                         &exception);
6182         } while (exception.retry);
6183         return err;
6184 }
6185 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6186
6187 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6188 {
6189         struct nfs4_layoutcommit_data *data = calldata;
6190         struct nfs_server *server = NFS_SERVER(data->args.inode);
6191
6192         if (nfs4_setup_sequence(server, &data->args.seq_args,
6193                                 &data->res.seq_res, task))
6194                 return;
6195         rpc_call_start(task);
6196 }
6197
6198 static void
6199 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6200 {
6201         struct nfs4_layoutcommit_data *data = calldata;
6202         struct nfs_server *server = NFS_SERVER(data->args.inode);
6203
6204         if (!nfs4_sequence_done(task, &data->res.seq_res))
6205                 return;
6206
6207         switch (task->tk_status) { /* Just ignore these failures */
6208         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6209         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6210         case -NFS4ERR_BADLAYOUT:     /* no layout */
6211         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6212                 task->tk_status = 0;
6213                 break;
6214         case 0:
6215                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6216                                                    data->res.fattr);
6217                 break;
6218         default:
6219                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6220                         rpc_restart_call_prepare(task);
6221                         return;
6222                 }
6223         }
6224 }
6225
6226 static void nfs4_layoutcommit_release(void *calldata)
6227 {
6228         struct nfs4_layoutcommit_data *data = calldata;
6229         struct pnfs_layout_segment *lseg, *tmp;
6230         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6231
6232         pnfs_cleanup_layoutcommit(data);
6233         /* Matched by references in pnfs_set_layoutcommit */
6234         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6235                 list_del_init(&lseg->pls_lc_list);
6236                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6237                                        &lseg->pls_flags))
6238                         put_lseg(lseg);
6239         }
6240
6241         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6242         smp_mb__after_clear_bit();
6243         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6244
6245         put_rpccred(data->cred);
6246         kfree(data);
6247 }
6248
6249 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6250         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6251         .rpc_call_done = nfs4_layoutcommit_done,
6252         .rpc_release = nfs4_layoutcommit_release,
6253 };
6254
6255 int
6256 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6257 {
6258         struct rpc_message msg = {
6259                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6260                 .rpc_argp = &data->args,
6261                 .rpc_resp = &data->res,
6262                 .rpc_cred = data->cred,
6263         };
6264         struct rpc_task_setup task_setup_data = {
6265                 .task = &data->task,
6266                 .rpc_client = NFS_CLIENT(data->args.inode),
6267                 .rpc_message = &msg,
6268                 .callback_ops = &nfs4_layoutcommit_ops,
6269                 .callback_data = data,
6270                 .flags = RPC_TASK_ASYNC,
6271         };
6272         struct rpc_task *task;
6273         int status = 0;
6274
6275         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6276                 "lbw: %llu inode %lu\n",
6277                 data->task.tk_pid, sync,
6278                 data->args.lastbytewritten,
6279                 data->args.inode->i_ino);
6280
6281         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6282         task = rpc_run_task(&task_setup_data);
6283         if (IS_ERR(task))
6284                 return PTR_ERR(task);
6285         if (sync == false)
6286                 goto out;
6287         status = nfs4_wait_for_completion_rpc_task(task);
6288         if (status != 0)
6289                 goto out;
6290         status = task->tk_status;
6291 out:
6292         dprintk("%s: status %d\n", __func__, status);
6293         rpc_put_task(task);
6294         return status;
6295 }
6296
6297 static int
6298 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6299                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6300 {
6301         struct nfs41_secinfo_no_name_args args = {
6302                 .style = SECINFO_STYLE_CURRENT_FH,
6303         };
6304         struct nfs4_secinfo_res res = {
6305                 .flavors = flavors,
6306         };
6307         struct rpc_message msg = {
6308                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6309                 .rpc_argp = &args,
6310                 .rpc_resp = &res,
6311         };
6312         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6313 }
6314
6315 static int
6316 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6317                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6318 {
6319         struct nfs4_exception exception = { };
6320         int err;
6321         do {
6322                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6323                 switch (err) {
6324                 case 0:
6325                 case -NFS4ERR_WRONGSEC:
6326                 case -NFS4ERR_NOTSUPP:
6327                         goto out;
6328                 default:
6329                         err = nfs4_handle_exception(server, err, &exception);
6330                 }
6331         } while (exception.retry);
6332 out:
6333         return err;
6334 }
6335
6336 static int
6337 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6338                     struct nfs_fsinfo *info)
6339 {
6340         int err;
6341         struct page *page;
6342         rpc_authflavor_t flavor;
6343         struct nfs4_secinfo_flavors *flavors;
6344
6345         page = alloc_page(GFP_KERNEL);
6346         if (!page) {
6347                 err = -ENOMEM;
6348                 goto out;
6349         }
6350
6351         flavors = page_address(page);
6352         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6353
6354         /*
6355          * Fall back on "guess and check" method if
6356          * the server doesn't support SECINFO_NO_NAME
6357          */
6358         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6359                 err = nfs4_find_root_sec(server, fhandle, info);
6360                 goto out_freepage;
6361         }
6362         if (err)
6363                 goto out_freepage;
6364
6365         flavor = nfs_find_best_sec(flavors);
6366         if (err == 0)
6367                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6368
6369 out_freepage:
6370         put_page(page);
6371         if (err == -EACCES)
6372                 return -EPERM;
6373 out:
6374         return err;
6375 }
6376
6377 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6378 {
6379         int status;
6380         struct nfs41_test_stateid_args args = {
6381                 .stateid = stateid,
6382         };
6383         struct nfs41_test_stateid_res res;
6384         struct rpc_message msg = {
6385                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6386                 .rpc_argp = &args,
6387                 .rpc_resp = &res,
6388         };
6389
6390         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6391         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6392
6393         if (status == NFS_OK)
6394                 return res.status;
6395         return status;
6396 }
6397
6398 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6399 {
6400         struct nfs4_exception exception = { };
6401         int err;
6402         do {
6403                 err = nfs4_handle_exception(server,
6404                                 _nfs41_test_stateid(server, stateid),
6405                                 &exception);
6406         } while (exception.retry);
6407         return err;
6408 }
6409
6410 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6411 {
6412         struct nfs41_free_stateid_args args = {
6413                 .stateid = stateid,
6414         };
6415         struct nfs41_free_stateid_res res;
6416         struct rpc_message msg = {
6417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6418                 .rpc_argp = &args,
6419                 .rpc_resp = &res,
6420         };
6421
6422         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6423         return nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6424 }
6425
6426 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6427 {
6428         struct nfs4_exception exception = { };
6429         int err;
6430         do {
6431                 err = nfs4_handle_exception(server,
6432                                 _nfs4_free_stateid(server, stateid),
6433                                 &exception);
6434         } while (exception.retry);
6435         return err;
6436 }
6437
6438 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6439                 const nfs4_stateid *s2)
6440 {
6441         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6442                 return false;
6443
6444         if (s1->seqid == s2->seqid)
6445                 return true;
6446         if (s1->seqid == 0 || s2->seqid == 0)
6447                 return true;
6448
6449         return false;
6450 }
6451
6452 #endif /* CONFIG_NFS_V4_1 */
6453
6454 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6455                 const nfs4_stateid *s2)
6456 {
6457         return nfs4_stateid_match(s1, s2);
6458 }
6459
6460
6461 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6462         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6463         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6464         .recover_open   = nfs4_open_reclaim,
6465         .recover_lock   = nfs4_lock_reclaim,
6466         .establish_clid = nfs4_init_clientid,
6467         .get_clid_cred  = nfs4_get_setclientid_cred,
6468 };
6469
6470 #if defined(CONFIG_NFS_V4_1)
6471 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6472         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6473         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6474         .recover_open   = nfs4_open_reclaim,
6475         .recover_lock   = nfs4_lock_reclaim,
6476         .establish_clid = nfs41_init_clientid,
6477         .get_clid_cred  = nfs4_get_exchange_id_cred,
6478         .reclaim_complete = nfs41_proc_reclaim_complete,
6479 };
6480 #endif /* CONFIG_NFS_V4_1 */
6481
6482 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6483         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6484         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6485         .recover_open   = nfs4_open_expired,
6486         .recover_lock   = nfs4_lock_expired,
6487         .establish_clid = nfs4_init_clientid,
6488         .get_clid_cred  = nfs4_get_setclientid_cred,
6489 };
6490
6491 #if defined(CONFIG_NFS_V4_1)
6492 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6493         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6494         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6495         .recover_open   = nfs41_open_expired,
6496         .recover_lock   = nfs41_lock_expired,
6497         .establish_clid = nfs41_init_clientid,
6498         .get_clid_cred  = nfs4_get_exchange_id_cred,
6499 };
6500 #endif /* CONFIG_NFS_V4_1 */
6501
6502 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6503         .sched_state_renewal = nfs4_proc_async_renew,
6504         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6505         .renew_lease = nfs4_proc_renew,
6506 };
6507
6508 #if defined(CONFIG_NFS_V4_1)
6509 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6510         .sched_state_renewal = nfs41_proc_async_sequence,
6511         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6512         .renew_lease = nfs4_proc_sequence,
6513 };
6514 #endif
6515
6516 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6517         .minor_version = 0,
6518         .call_sync = _nfs4_call_sync,
6519         .match_stateid = nfs4_match_stateid,
6520         .find_root_sec = nfs4_find_root_sec,
6521         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6522         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6523         .state_renewal_ops = &nfs40_state_renewal_ops,
6524 };
6525
6526 #if defined(CONFIG_NFS_V4_1)
6527 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6528         .minor_version = 1,
6529         .call_sync = _nfs4_call_sync_session,
6530         .match_stateid = nfs41_match_stateid,
6531         .find_root_sec = nfs41_find_root_sec,
6532         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6533         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6534         .state_renewal_ops = &nfs41_state_renewal_ops,
6535 };
6536 #endif
6537
6538 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6539         [0] = &nfs_v4_0_minor_ops,
6540 #if defined(CONFIG_NFS_V4_1)
6541         [1] = &nfs_v4_1_minor_ops,
6542 #endif
6543 };
6544
6545 static const struct inode_operations nfs4_file_inode_operations = {
6546         .permission     = nfs_permission,
6547         .getattr        = nfs_getattr,
6548         .setattr        = nfs_setattr,
6549         .getxattr       = generic_getxattr,
6550         .setxattr       = generic_setxattr,
6551         .listxattr      = generic_listxattr,
6552         .removexattr    = generic_removexattr,
6553 };
6554
6555 const struct nfs_rpc_ops nfs_v4_clientops = {
6556         .version        = 4,                    /* protocol version */
6557         .dentry_ops     = &nfs4_dentry_operations,
6558         .dir_inode_ops  = &nfs4_dir_inode_operations,
6559         .file_inode_ops = &nfs4_file_inode_operations,
6560         .file_ops       = &nfs4_file_operations,
6561         .getroot        = nfs4_proc_get_root,
6562         .submount       = nfs4_submount,
6563         .getattr        = nfs4_proc_getattr,
6564         .setattr        = nfs4_proc_setattr,
6565         .lookup         = nfs4_proc_lookup,
6566         .access         = nfs4_proc_access,
6567         .readlink       = nfs4_proc_readlink,
6568         .create         = nfs4_proc_create,
6569         .remove         = nfs4_proc_remove,
6570         .unlink_setup   = nfs4_proc_unlink_setup,
6571         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6572         .unlink_done    = nfs4_proc_unlink_done,
6573         .rename         = nfs4_proc_rename,
6574         .rename_setup   = nfs4_proc_rename_setup,
6575         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6576         .rename_done    = nfs4_proc_rename_done,
6577         .link           = nfs4_proc_link,
6578         .symlink        = nfs4_proc_symlink,
6579         .mkdir          = nfs4_proc_mkdir,
6580         .rmdir          = nfs4_proc_remove,
6581         .readdir        = nfs4_proc_readdir,
6582         .mknod          = nfs4_proc_mknod,
6583         .statfs         = nfs4_proc_statfs,
6584         .fsinfo         = nfs4_proc_fsinfo,
6585         .pathconf       = nfs4_proc_pathconf,
6586         .set_capabilities = nfs4_server_capabilities,
6587         .decode_dirent  = nfs4_decode_dirent,
6588         .read_setup     = nfs4_proc_read_setup,
6589         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6590         .read_done      = nfs4_read_done,
6591         .write_setup    = nfs4_proc_write_setup,
6592         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6593         .write_done     = nfs4_write_done,
6594         .commit_setup   = nfs4_proc_commit_setup,
6595         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6596         .commit_done    = nfs4_commit_done,
6597         .lock           = nfs4_proc_lock,
6598         .clear_acl_cache = nfs4_zap_acl_attr,
6599         .close_context  = nfs4_close_context,
6600         .open_context   = nfs4_atomic_open,
6601         .init_client    = nfs4_init_client,
6602 };
6603
6604 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6605         .prefix = XATTR_NAME_NFSV4_ACL,
6606         .list   = nfs4_xattr_list_nfs4_acl,
6607         .get    = nfs4_xattr_get_nfs4_acl,
6608         .set    = nfs4_xattr_set_nfs4_acl,
6609 };
6610
6611 const struct xattr_handler *nfs4_xattr_handlers[] = {
6612         &nfs4_xattr_nfs4_acl_handler,
6613         NULL
6614 };
6615
6616 module_param(max_session_slots, ushort, 0644);
6617 MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 "
6618                 "requests the client will negotiate");
6619
6620 /*
6621  * Local variables:
6622  *  c-basic-offset: 8
6623  * End:
6624  */