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/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/namei.h>
  49 #include <linux/mount.h>
  50 #include <linux/module.h>
  51 #include <linux/sunrpc/bc_xprt.h>
  52
  53 #include "nfs4_fs.h"
  54 #include "delegation.h"
  55 #include "internal.h"
  56 #include "iostat.h"
  57 #include "callback.h"
  58
  59 #define NFSDBG_FACILITY         NFSDBG_PROC
  60
  61 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  62 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  63
  64 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  65
  66 struct nfs4_opendata;
  67 static int _nfs4_proc_open(struct nfs4_opendata *data);
  68 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  69 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  70 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  71 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  72 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  73 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  74                             struct nfs_fattr *fattr, struct iattr *sattr,
  75                             struct nfs4_state *state);
  76
  77 /* Prevent leaks of NFSv4 errors into userland */
  78 static int nfs4_map_errors(int err)
  79 {
  80         if (err >= -1000)
  81                 return err;
  82         switch (err) {
  83         case -NFS4ERR_RESOURCE:
  84                 return -EREMOTEIO;
  85         default:
  86                 dprintk("%s could not handle NFSv4 error %d\n",
  87                                 __func__, -err);
  88                 break;
  89         }
  90         return -EIO;
  91 }
  92
  93 /*
  94  * This is our standard bitmap for GETATTR requests.
  95  */
  96 const u32 nfs4_fattr_bitmap[2] = {
  97         FATTR4_WORD0_TYPE
  98         | FATTR4_WORD0_CHANGE
  99         | FATTR4_WORD0_SIZE
 100         | FATTR4_WORD0_FSID
 101         | FATTR4_WORD0_FILEID,
 102         FATTR4_WORD1_MODE
 103         | FATTR4_WORD1_NUMLINKS
 104         | FATTR4_WORD1_OWNER
 105         | FATTR4_WORD1_OWNER_GROUP
 106         | FATTR4_WORD1_RAWDEV
 107         | FATTR4_WORD1_SPACE_USED
 108         | FATTR4_WORD1_TIME_ACCESS
 109         | FATTR4_WORD1_TIME_METADATA
 110         | FATTR4_WORD1_TIME_MODIFY
 111 };
 112
 113 const u32 nfs4_statfs_bitmap[2] = {
 114         FATTR4_WORD0_FILES_AVAIL
 115         | FATTR4_WORD0_FILES_FREE
 116         | FATTR4_WORD0_FILES_TOTAL,
 117         FATTR4_WORD1_SPACE_AVAIL
 118         | FATTR4_WORD1_SPACE_FREE
 119         | FATTR4_WORD1_SPACE_TOTAL
 120 };
 121
 122 const u32 nfs4_pathconf_bitmap[2] = {
 123         FATTR4_WORD0_MAXLINK
 124         | FATTR4_WORD0_MAXNAME,
 125         0
 126 };
 127
 128 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 129                         | FATTR4_WORD0_MAXREAD
 130                         | FATTR4_WORD0_MAXWRITE
 131                         | FATTR4_WORD0_LEASE_TIME,
 132                         0
 133 };
 134
 135 const u32 nfs4_fs_locations_bitmap[2] = {
 136         FATTR4_WORD0_TYPE
 137         | FATTR4_WORD0_CHANGE
 138         | FATTR4_WORD0_SIZE
 139         | FATTR4_WORD0_FSID
 140         | FATTR4_WORD0_FILEID
 141         | FATTR4_WORD0_FS_LOCATIONS,
 142         FATTR4_WORD1_MODE
 143         | FATTR4_WORD1_NUMLINKS
 144         | FATTR4_WORD1_OWNER
 145         | FATTR4_WORD1_OWNER_GROUP
 146         | FATTR4_WORD1_RAWDEV
 147         | FATTR4_WORD1_SPACE_USED
 148         | FATTR4_WORD1_TIME_ACCESS
 149         | FATTR4_WORD1_TIME_METADATA
 150         | FATTR4_WORD1_TIME_MODIFY
 151         | FATTR4_WORD1_MOUNTED_ON_FILEID
 152 };
 153
 154 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 155                 struct nfs4_readdir_arg *readdir)
 156 {
 157         __be32 *start, *p;
 158
 159         BUG_ON(readdir->count < 80);
 160         if (cookie > 2) {
 161                 readdir->cookie = cookie;
 162                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 163                 return;
 164         }
 165
 166         readdir->cookie = 0;
 167         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 168         if (cookie == 2)
 169                 return;
 170
 171         /*
 172          * NFSv4 servers do not return entries for '.' and '..'
 173          * Therefore, we fake these entries here.  We let '.'
 174          * have cookie 0 and '..' have cookie 1.  Note that
 175          * when talking to the server, we always send cookie 0
 176          * instead of 1 or 2.
 177          */
 178         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 179
 180         if (cookie == 0) {
 181                 *p++ = xdr_one;                                  /* next */
 182                 *p++ = xdr_zero;                   /* cookie, first word */
 183                 *p++ = xdr_one;                   /* cookie, second word */
 184                 *p++ = xdr_one;                             /* entry len */
 185                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 186                 p++;
 187                 *p++ = xdr_one;                         /* bitmap length */
 188                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189                 *p++ = htonl(8);              /* attribute buffer length */
 190                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 191         }
 192
 193         *p++ = xdr_one;                                  /* next */
 194         *p++ = xdr_zero;                   /* cookie, first word */
 195         *p++ = xdr_two;                   /* cookie, second word */
 196         *p++ = xdr_two;                             /* entry len */
 197         memcpy(p, "..\0\0", 4);                         /* entry */
 198         p++;
 199         *p++ = xdr_one;                         /* bitmap length */
 200         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 201         *p++ = htonl(8);              /* attribute buffer length */
 202         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 203
 204         readdir->pgbase = (char *)p - (char *)start;
 205         readdir->count -= readdir->pgbase;
 206         kunmap_atomic(start, KM_USER0);
 207 }
 208
 209 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 210 {
 211         int res;
 212
 213         might_sleep();
 214
 215         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 216                         nfs_wait_bit_killable, TASK_KILLABLE);
 217         return res;
 218 }
 219
 220 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 221 {
 222         int res = 0;
 223
 224         might_sleep();
 225
 226         if (*timeout <= 0)
 227                 *timeout = NFS4_POLL_RETRY_MIN;
 228         if (*timeout > NFS4_POLL_RETRY_MAX)
 229                 *timeout = NFS4_POLL_RETRY_MAX;
 230         schedule_timeout_killable(*timeout);
 231         if (fatal_signal_pending(current))
 232                 res = -ERESTARTSYS;
 233         *timeout <<= 1;
 234         return res;
 235 }
 236
 237 /* This is the error handling routine for processes that are allowed
 238  * to sleep.
 239  */
 240 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 241 {
 242         struct nfs_client *clp = server->nfs_client;
 243         struct nfs4_state *state = exception->state;
 244         int ret = errorcode;
 245
 246         exception->retry = 0;
 247         switch(errorcode) {
 248                 case 0:
 249                         return 0;
 250                 case -NFS4ERR_ADMIN_REVOKED:
 251                 case -NFS4ERR_BAD_STATEID:
 252                 case -NFS4ERR_OPENMODE:
 253                         if (state == NULL)
 254                                 break;
 255                         nfs4_state_mark_reclaim_nograce(clp, state);
 256                         goto do_state_recovery;
 257                 case -NFS4ERR_STALE_STATEID:
 258                         if (state == NULL)
 259                                 break;
 260                         nfs4_state_mark_reclaim_reboot(clp, state);
 261                 case -NFS4ERR_STALE_CLIENTID:
 262                 case -NFS4ERR_EXPIRED:
 263                         goto do_state_recovery;
 264 #if defined(CONFIG_NFS_V4_1)
 265                 case -NFS4ERR_BADSESSION:
 266                 case -NFS4ERR_BADSLOT:
 267                 case -NFS4ERR_BAD_HIGH_SLOT:
 268                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 269                 case -NFS4ERR_DEADSESSION:
 270                 case -NFS4ERR_SEQ_FALSE_RETRY:
 271                 case -NFS4ERR_SEQ_MISORDERED:
 272                         dprintk("%s ERROR: %d Reset session\n", __func__,
 273                                 errorcode);
 274                         nfs4_schedule_state_recovery(clp);
 275                         exception->retry = 1;
 276                         break;
 277 #endif /* defined(CONFIG_NFS_V4_1) */
 278                 case -NFS4ERR_FILE_OPEN:
 279                         if (exception->timeout > HZ) {
 280                                 /* We have retried a decent amount, time to
 281                                  * fail
 282                                  */
 283                                 ret = -EBUSY;
 284                                 break;
 285                         }
 286                 case -NFS4ERR_GRACE:
 287                 case -NFS4ERR_DELAY:
 288                 case -EKEYEXPIRED:
 289                         ret = nfs4_delay(server->client, &exception->timeout);
 290                         if (ret != 0)
 291                                 break;
 292                 case -NFS4ERR_OLD_STATEID:
 293                         exception->retry = 1;
 294         }
 295         /* We failed to handle the error */
 296         return nfs4_map_errors(ret);
 297 do_state_recovery:
 298         nfs4_schedule_state_recovery(clp);
 299         ret = nfs4_wait_clnt_recover(clp);
 300         if (ret == 0)
 301                 exception->retry = 1;
 302         return ret;
 303 }
 304
 305
 306 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 307 {
 308         struct nfs_client *clp = server->nfs_client;
 309         spin_lock(&clp->cl_lock);
 310         if (time_before(clp->cl_last_renewal,timestamp))
 311                 clp->cl_last_renewal = timestamp;
 312         spin_unlock(&clp->cl_lock);
 313 }
 314
 315 #if defined(CONFIG_NFS_V4_1)
 316
 317 /*
 318  * nfs4_free_slot - free a slot and efficiently update slot table.
 319  *
 320  * freeing a slot is trivially done by clearing its respective bit
 321  * in the bitmap.
 322  * If the freed slotid equals highest_used_slotid we want to update it
 323  * so that the server would be able to size down the slot table if needed,
 324  * otherwise we know that the highest_used_slotid is still in use.
 325  * When updating highest_used_slotid there may be "holes" in the bitmap
 326  * so we need to scan down from highest_used_slotid to 0 looking for the now
 327  * highest slotid in use.
 328  * If none found, highest_used_slotid is set to -1.
 329  *
 330  * Must be called while holding tbl->slot_tbl_lock
 331  */
 332 static void
 333 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 334 {
 335         int slotid = free_slotid;
 336
 337         /* clear used bit in bitmap */
 338         __clear_bit(slotid, tbl->used_slots);
 339
 340         /* update highest_used_slotid when it is freed */
 341         if (slotid == tbl->highest_used_slotid) {
 342                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 343                 if (slotid < tbl->max_slots)
 344                         tbl->highest_used_slotid = slotid;
 345                 else
 346                         tbl->highest_used_slotid = -1;
 347         }
 348         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 349                 free_slotid, tbl->highest_used_slotid);
 350 }
 351
 352 /*
 353  * Signal state manager thread if session is drained
 354  */
 355 static void nfs41_check_drain_session_complete(struct nfs4_session *ses)
 356 {
 357         struct rpc_task *task;
 358
 359         if (!test_bit(NFS4CLNT_SESSION_DRAINING, &ses->clp->cl_state)) {
 360                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 361                 if (task)
 362                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 363                 return;
 364         }
 365
 366         if (ses->fc_slot_table.highest_used_slotid != -1)
 367                 return;
 368
 369         dprintk("%s COMPLETE: Session Drained\n", __func__);
 370         complete(&ses->complete);
 371 }
 372
 373 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 374 {
 375         struct nfs4_slot_table *tbl;
 376
 377         tbl = &res->sr_session->fc_slot_table;
 378         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
 379                 /* just wake up the next guy waiting since
 380                  * we may have not consumed a slot after all */
 381                 dprintk("%s: No slot\n", __func__);
 382                 return;
 383         }
 384
 385         spin_lock(&tbl->slot_tbl_lock);
 386         nfs4_free_slot(tbl, res->sr_slotid);
 387         nfs41_check_drain_session_complete(res->sr_session);
 388         spin_unlock(&tbl->slot_tbl_lock);
 389         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 390 }
 391
 392 static void nfs41_sequence_done(struct nfs4_sequence_res *res)
 393 {
 394         unsigned long timestamp;
 395         struct nfs4_slot_table *tbl;
 396         struct nfs4_slot *slot;
 397
 398         /*
 399          * sr_status remains 1 if an RPC level error occurred. The server
 400          * may or may not have processed the sequence operation..
 401          * Proceed as if the server received and processed the sequence
 402          * operation.
 403          */
 404         if (res->sr_status == 1)
 405                 res->sr_status = NFS_OK;
 406
 407         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 408         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
 409                 goto out;
 410
 411         /* Check the SEQUENCE operation status */
 412         if (res->sr_status == 0) {
 413                 struct nfs_client *clp = res->sr_session->clp;
 414                 tbl = &res->sr_session->fc_slot_table;
 415                 slot = tbl->slots + res->sr_slotid;
 416                 /* Update the slot's sequence and clientid lease timer */
 417                 ++slot->seq_nr;
 418                 timestamp = res->sr_renewal_time;
 419                 spin_lock(&clp->cl_lock);
 420                 if (time_before(clp->cl_last_renewal, timestamp))
 421                         clp->cl_last_renewal = timestamp;
 422                 spin_unlock(&clp->cl_lock);
 423                 /* Check sequence flags */
 424                 if (atomic_read(&clp->cl_count) > 1)
 425                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 426         }
 427 out:
 428         /* The session may be reset by one of the error handlers. */
 429         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 430         nfs41_sequence_free_slot(res);
 431 }
 432
 433 /*
 434  * nfs4_find_slot - efficiently look for a free slot
 435  *
 436  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 437  * If found, we mark the slot as used, update the highest_used_slotid,
 438  * and respectively set up the sequence operation args.
 439  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 440  *
 441  * Note: must be called with under the slot_tbl_lock.
 442  */
 443 static u8
 444 nfs4_find_slot(struct nfs4_slot_table *tbl)
 445 {
 446         int slotid;
 447         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 448         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 449
 450         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 451                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 452                 tbl->max_slots);
 453         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 454         if (slotid >= tbl->max_slots)
 455                 goto out;
 456         __set_bit(slotid, tbl->used_slots);
 457         if (slotid > tbl->highest_used_slotid)
 458                 tbl->highest_used_slotid = slotid;
 459         ret_id = slotid;
 460 out:
 461         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 462                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 463         return ret_id;
 464 }
 465
 466 static int nfs41_setup_sequence(struct nfs4_session *session,
 467                                 struct nfs4_sequence_args *args,
 468                                 struct nfs4_sequence_res *res,
 469                                 int cache_reply,
 470                                 struct rpc_task *task)
 471 {
 472         struct nfs4_slot *slot;
 473         struct nfs4_slot_table *tbl;
 474         u8 slotid;
 475
 476         dprintk("--> %s\n", __func__);
 477         /* slot already allocated? */
 478         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
 479                 return 0;
 480
 481         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 482         tbl = &session->fc_slot_table;
 483
 484         spin_lock(&tbl->slot_tbl_lock);
 485         if (test_bit(NFS4CLNT_SESSION_DRAINING, &session->clp->cl_state) &&
 486             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 487                 /*
 488                  * The state manager will wait until the slot table is empty.
 489                  * Schedule the reset thread
 490                  */
 491                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 492                 spin_unlock(&tbl->slot_tbl_lock);
 493                 dprintk("%s Schedule Session Reset\n", __func__);
 494                 return -EAGAIN;
 495         }
 496
 497         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 498             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 499                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 500                 spin_unlock(&tbl->slot_tbl_lock);
 501                 dprintk("%s enforce FIFO order\n", __func__);
 502                 return -EAGAIN;
 503         }
 504
 505         slotid = nfs4_find_slot(tbl);
 506         if (slotid == NFS4_MAX_SLOT_TABLE) {
 507                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 508                 spin_unlock(&tbl->slot_tbl_lock);
 509                 dprintk("<-- %s: no free slots\n", __func__);
 510                 return -EAGAIN;
 511         }
 512         spin_unlock(&tbl->slot_tbl_lock);
 513
 514         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 515         slot = tbl->slots + slotid;
 516         args->sa_session = session;
 517         args->sa_slotid = slotid;
 518         args->sa_cache_this = cache_reply;
 519
 520         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 521
 522         res->sr_session = session;
 523         res->sr_slotid = slotid;
 524         res->sr_renewal_time = jiffies;
 525         res->sr_status_flags = 0;
 526         /*
 527          * sr_status is only set in decode_sequence, and so will remain
 528          * set to 1 if an rpc level failure occurs.
 529          */
 530         res->sr_status = 1;
 531         return 0;
 532 }
 533
 534 int nfs4_setup_sequence(const struct nfs_server *server,
 535                         struct nfs4_sequence_args *args,
 536                         struct nfs4_sequence_res *res,
 537                         int cache_reply,
 538                         struct rpc_task *task)
 539 {
 540         struct nfs4_session *session = nfs4_get_session(server);
 541         int ret = 0;
 542
 543         if (session == NULL) {
 544                 args->sa_session = NULL;
 545                 res->sr_session = NULL;
 546                 goto out;
 547         }
 548
 549         dprintk("--> %s clp %p session %p sr_slotid %d\n",
 550                 __func__, session->clp, session, res->sr_slotid);
 551
 552         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 553                                    task);
 554 out:
 555         dprintk("<-- %s status=%d\n", __func__, ret);
 556         return ret;
 557 }
 558
 559 struct nfs41_call_sync_data {
 560         const struct nfs_server *seq_server;
 561         struct nfs4_sequence_args *seq_args;
 562         struct nfs4_sequence_res *seq_res;
 563         int cache_reply;
 564 };
 565
 566 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 567 {
 568         struct nfs41_call_sync_data *data = calldata;
 569
 570         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 571
 572         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 573                                 data->seq_res, data->cache_reply, task))
 574                 return;
 575         rpc_call_start(task);
 576 }
 577
 578 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 579 {
 580         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 581         nfs41_call_sync_prepare(task, calldata);
 582 }
 583
 584 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 585 {
 586         struct nfs41_call_sync_data *data = calldata;
 587
 588         nfs41_sequence_done(data->seq_res);
 589 }
 590
 591 struct rpc_call_ops nfs41_call_sync_ops = {
 592         .rpc_call_prepare = nfs41_call_sync_prepare,
 593         .rpc_call_done = nfs41_call_sync_done,
 594 };
 595
 596 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 597         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 598         .rpc_call_done = nfs41_call_sync_done,
 599 };
 600
 601 static int nfs4_call_sync_sequence(struct nfs_server *server,
 602                                    struct rpc_message *msg,
 603                                    struct nfs4_sequence_args *args,
 604                                    struct nfs4_sequence_res *res,
 605                                    int cache_reply,
 606                                    int privileged)
 607 {
 608         int ret;
 609         struct rpc_task *task;
 610         struct nfs41_call_sync_data data = {
 611                 .seq_server = server,
 612                 .seq_args = args,
 613                 .seq_res = res,
 614                 .cache_reply = cache_reply,
 615         };
 616         struct rpc_task_setup task_setup = {
 617                 .rpc_client = server->client,
 618                 .rpc_message = msg,
 619                 .callback_ops = &nfs41_call_sync_ops,
 620                 .callback_data = &data
 621         };
 622
 623         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 624         if (privileged)
 625                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 626         task = rpc_run_task(&task_setup);
 627         if (IS_ERR(task))
 628                 ret = PTR_ERR(task);
 629         else {
 630                 ret = task->tk_status;
 631                 rpc_put_task(task);
 632         }
 633         return ret;
 634 }
 635
 636 int _nfs4_call_sync_session(struct nfs_server *server,
 637                             struct rpc_message *msg,
 638                             struct nfs4_sequence_args *args,
 639                             struct nfs4_sequence_res *res,
 640                             int cache_reply)
 641 {
 642         return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
 643 }
 644
 645 #endif /* CONFIG_NFS_V4_1 */
 646
 647 int _nfs4_call_sync(struct nfs_server *server,
 648                     struct rpc_message *msg,
 649                     struct nfs4_sequence_args *args,
 650                     struct nfs4_sequence_res *res,
 651                     int cache_reply)
 652 {
 653         args->sa_session = res->sr_session = NULL;
 654         return rpc_call_sync(server->client, msg, 0);
 655 }
 656
 657 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 658         (server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
 659                         &(res)->seq_res, (cache_reply))
 660
 661 static void nfs4_sequence_done(const struct nfs_server *server,
 662                                struct nfs4_sequence_res *res, int rpc_status)
 663 {
 664 #ifdef CONFIG_NFS_V4_1
 665         if (nfs4_has_session(server->nfs_client))
 666                 nfs41_sequence_done(res);
 667 #endif /* CONFIG_NFS_V4_1 */
 668 }
 669
 670 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 671 {
 672         struct nfs_inode *nfsi = NFS_I(dir);
 673
 674         spin_lock(&dir->i_lock);
 675         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 676         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 677                 nfs_force_lookup_revalidate(dir);
 678         nfsi->change_attr = cinfo->after;
 679         spin_unlock(&dir->i_lock);
 680 }
 681
 682 struct nfs4_opendata {
 683         struct kref kref;
 684         struct nfs_openargs o_arg;
 685         struct nfs_openres o_res;
 686         struct nfs_open_confirmargs c_arg;
 687         struct nfs_open_confirmres c_res;
 688         struct nfs_fattr f_attr;
 689         struct nfs_fattr dir_attr;
 690         struct path path;
 691         struct dentry *dir;
 692         struct nfs4_state_owner *owner;
 693         struct nfs4_state *state;
 694         struct iattr attrs;
 695         unsigned long timestamp;
 696         unsigned int rpc_done : 1;
 697         int rpc_status;
 698         int cancelled;
 699 };
 700
 701
 702 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 703 {
 704         p->o_res.f_attr = &p->f_attr;
 705         p->o_res.dir_attr = &p->dir_attr;
 706         p->o_res.seqid = p->o_arg.seqid;
 707         p->c_res.seqid = p->c_arg.seqid;
 708         p->o_res.server = p->o_arg.server;
 709         nfs_fattr_init(&p->f_attr);
 710         nfs_fattr_init(&p->dir_attr);
 711         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
 712 }
 713
 714 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 715                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 716                 const struct iattr *attrs,
 717                 gfp_t gfp_mask)
 718 {
 719         struct dentry *parent = dget_parent(path->dentry);
 720         struct inode *dir = parent->d_inode;
 721         struct nfs_server *server = NFS_SERVER(dir);
 722         struct nfs4_opendata *p;
 723
 724         p = kzalloc(sizeof(*p), gfp_mask);
 725         if (p == NULL)
 726                 goto err;
 727         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 728         if (p->o_arg.seqid == NULL)
 729                 goto err_free;
 730         path_get(path);
 731         p->path = *path;
 732         p->dir = parent;
 733         p->owner = sp;
 734         atomic_inc(&sp->so_count);
 735         p->o_arg.fh = NFS_FH(dir);
 736         p->o_arg.open_flags = flags;
 737         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 738         p->o_arg.clientid = server->nfs_client->cl_clientid;
 739         p->o_arg.id = sp->so_owner_id.id;
 740         p->o_arg.name = &p->path.dentry->d_name;
 741         p->o_arg.server = server;
 742         p->o_arg.bitmask = server->attr_bitmask;
 743         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 744         if (flags & O_EXCL) {
 745                 if (nfs4_has_persistent_session(server->nfs_client)) {
 746                         /* GUARDED */
 747                         p->o_arg.u.attrs = &p->attrs;
 748                         memcpy(&p->attrs, attrs, sizeof(p->attrs));
 749                 } else { /* EXCLUSIVE4_1 */
 750                         u32 *s = (u32 *) p->o_arg.u.verifier.data;
 751                         s[0] = jiffies;
 752                         s[1] = current->pid;
 753                 }
 754         } else if (flags & O_CREAT) {
 755                 p->o_arg.u.attrs = &p->attrs;
 756                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 757         }
 758         p->c_arg.fh = &p->o_res.fh;
 759         p->c_arg.stateid = &p->o_res.stateid;
 760         p->c_arg.seqid = p->o_arg.seqid;
 761         nfs4_init_opendata_res(p);
 762         kref_init(&p->kref);
 763         return p;
 764 err_free:
 765         kfree(p);
 766 err:
 767         dput(parent);
 768         return NULL;
 769 }
 770
 771 static void nfs4_opendata_free(struct kref *kref)
 772 {
 773         struct nfs4_opendata *p = container_of(kref,
 774                         struct nfs4_opendata, kref);
 775
 776         nfs_free_seqid(p->o_arg.seqid);
 777         if (p->state != NULL)
 778                 nfs4_put_open_state(p->state);
 779         nfs4_put_state_owner(p->owner);
 780         dput(p->dir);
 781         path_put(&p->path);
 782         kfree(p);
 783 }
 784
 785 static void nfs4_opendata_put(struct nfs4_opendata *p)
 786 {
 787         if (p != NULL)
 788                 kref_put(&p->kref, nfs4_opendata_free);
 789 }
 790
 791 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 792 {
 793         int ret;
 794
 795         ret = rpc_wait_for_completion_task(task);
 796         return ret;
 797 }
 798
 799 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 800 {
 801         int ret = 0;
 802
 803         if (open_mode & O_EXCL)
 804                 goto out;
 805         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 806                 case FMODE_READ:
 807                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 808                                 && state->n_rdonly != 0;
 809                         break;
 810                 case FMODE_WRITE:
 811                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 812                                 && state->n_wronly != 0;
 813                         break;
 814                 case FMODE_READ|FMODE_WRITE:
 815                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 816                                 && state->n_rdwr != 0;
 817         }
 818 out:
 819         return ret;
 820 }
 821
 822 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 823 {
 824         if ((delegation->type & fmode) != fmode)
 825                 return 0;
 826         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 827                 return 0;
 828         nfs_mark_delegation_referenced(delegation);
 829         return 1;
 830 }
 831
 832 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 833 {
 834         switch (fmode) {
 835                 case FMODE_WRITE:
 836                         state->n_wronly++;
 837                         break;
 838                 case FMODE_READ:
 839                         state->n_rdonly++;
 840                         break;
 841                 case FMODE_READ|FMODE_WRITE:
 842                         state->n_rdwr++;
 843         }
 844         nfs4_state_set_mode_locked(state, state->state | fmode);
 845 }
 846
 847 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 848 {
 849         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 850                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 851         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 852         switch (fmode) {
 853                 case FMODE_READ:
 854                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 855                         break;
 856                 case FMODE_WRITE:
 857                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 858                         break;
 859                 case FMODE_READ|FMODE_WRITE:
 860                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 861         }
 862 }
 863
 864 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 865 {
 866         write_seqlock(&state->seqlock);
 867         nfs_set_open_stateid_locked(state, stateid, fmode);
 868         write_sequnlock(&state->seqlock);
 869 }
 870
 871 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 872 {
 873         /*
 874          * Protect the call to nfs4_state_set_mode_locked and
 875          * serialise the stateid update
 876          */
 877         write_seqlock(&state->seqlock);
 878         if (deleg_stateid != NULL) {
 879                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 880                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 881         }
 882         if (open_stateid != NULL)
 883                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 884         write_sequnlock(&state->seqlock);
 885         spin_lock(&state->owner->so_lock);
 886         update_open_stateflags(state, fmode);
 887         spin_unlock(&state->owner->so_lock);
 888 }
 889
 890 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 891 {
 892         struct nfs_inode *nfsi = NFS_I(state->inode);
 893         struct nfs_delegation *deleg_cur;
 894         int ret = 0;
 895
 896         fmode &= (FMODE_READ|FMODE_WRITE);
 897
 898         rcu_read_lock();
 899         deleg_cur = rcu_dereference(nfsi->delegation);
 900         if (deleg_cur == NULL)
 901                 goto no_delegation;
 902
 903         spin_lock(&deleg_cur->lock);
 904         if (nfsi->delegation != deleg_cur ||
 905             (deleg_cur->type & fmode) != fmode)
 906                 goto no_delegation_unlock;
 907
 908         if (delegation == NULL)
 909                 delegation = &deleg_cur->stateid;
 910         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 911                 goto no_delegation_unlock;
 912
 913         nfs_mark_delegation_referenced(deleg_cur);
 914         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 915         ret = 1;
 916 no_delegation_unlock:
 917         spin_unlock(&deleg_cur->lock);
 918 no_delegation:
 919         rcu_read_unlock();
 920
 921         if (!ret && open_stateid != NULL) {
 922                 __update_open_stateid(state, open_stateid, NULL, fmode);
 923                 ret = 1;
 924         }
 925
 926         return ret;
 927 }
 928
 929
 930 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 931 {
 932         struct nfs_delegation *delegation;
 933
 934         rcu_read_lock();
 935         delegation = rcu_dereference(NFS_I(inode)->delegation);
 936         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 937                 rcu_read_unlock();
 938                 return;
 939         }
 940         rcu_read_unlock();
 941         nfs_inode_return_delegation(inode);
 942 }
 943
 944 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 945 {
 946         struct nfs4_state *state = opendata->state;
 947         struct nfs_inode *nfsi = NFS_I(state->inode);
 948         struct nfs_delegation *delegation;
 949         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 950         fmode_t fmode = opendata->o_arg.fmode;
 951         nfs4_stateid stateid;
 952         int ret = -EAGAIN;
 953
 954         for (;;) {
 955                 if (can_open_cached(state, fmode, open_mode)) {
 956                         spin_lock(&state->owner->so_lock);
 957                         if (can_open_cached(state, fmode, open_mode)) {
 958                                 update_open_stateflags(state, fmode);
 959                                 spin_unlock(&state->owner->so_lock);
 960                                 goto out_return_state;
 961                         }
 962                         spin_unlock(&state->owner->so_lock);
 963                 }
 964                 rcu_read_lock();
 965                 delegation = rcu_dereference(nfsi->delegation);
 966                 if (delegation == NULL ||
 967                     !can_open_delegated(delegation, fmode)) {
 968                         rcu_read_unlock();
 969                         break;
 970                 }
 971                 /* Save the delegation */
 972                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 973                 rcu_read_unlock();
 974                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 975                 if (ret != 0)
 976                         goto out;
 977                 ret = -EAGAIN;
 978
 979                 /* Try to update the stateid using the delegation */
 980                 if (update_open_stateid(state, NULL, &stateid, fmode))
 981                         goto out_return_state;
 982         }
 983 out:
 984         return ERR_PTR(ret);
 985 out_return_state:
 986         atomic_inc(&state->count);
 987         return state;
 988 }
 989
 990 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 991 {
 992         struct inode *inode;
 993         struct nfs4_state *state = NULL;
 994         struct nfs_delegation *delegation;
 995         int ret;
 996
 997         if (!data->rpc_done) {
 998                 state = nfs4_try_open_cached(data);
 999                 goto out;
1000         }
1001
1002         ret = -EAGAIN;
1003         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1004                 goto err;
1005         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1006         ret = PTR_ERR(inode);
1007         if (IS_ERR(inode))
1008                 goto err;
1009         ret = -ENOMEM;
1010         state = nfs4_get_open_state(inode, data->owner);
1011         if (state == NULL)
1012                 goto err_put_inode;
1013         if (data->o_res.delegation_type != 0) {
1014                 int delegation_flags = 0;
1015
1016                 rcu_read_lock();
1017                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1018                 if (delegation)
1019                         delegation_flags = delegation->flags;
1020                 rcu_read_unlock();
1021                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1022                         nfs_inode_set_delegation(state->inode,
1023                                         data->owner->so_cred,
1024                                         &data->o_res);
1025                 else
1026                         nfs_inode_reclaim_delegation(state->inode,
1027                                         data->owner->so_cred,
1028                                         &data->o_res);
1029         }
1030
1031         update_open_stateid(state, &data->o_res.stateid, NULL,
1032                         data->o_arg.fmode);
1033         iput(inode);
1034 out:
1035         return state;
1036 err_put_inode:
1037         iput(inode);
1038 err:
1039         return ERR_PTR(ret);
1040 }
1041
1042 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1043 {
1044         struct nfs_inode *nfsi = NFS_I(state->inode);
1045         struct nfs_open_context *ctx;
1046
1047         spin_lock(&state->inode->i_lock);
1048         list_for_each_entry(ctx, &nfsi->open_files, list) {
1049                 if (ctx->state != state)
1050                         continue;
1051                 get_nfs_open_context(ctx);
1052                 spin_unlock(&state->inode->i_lock);
1053                 return ctx;
1054         }
1055         spin_unlock(&state->inode->i_lock);
1056         return ERR_PTR(-ENOENT);
1057 }
1058
1059 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1060 {
1061         struct nfs4_opendata *opendata;
1062
1063         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1064         if (opendata == NULL)
1065                 return ERR_PTR(-ENOMEM);
1066         opendata->state = state;
1067         atomic_inc(&state->count);
1068         return opendata;
1069 }
1070
1071 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1072 {
1073         struct nfs4_state *newstate;
1074         int ret;
1075
1076         opendata->o_arg.open_flags = 0;
1077         opendata->o_arg.fmode = fmode;
1078         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1079         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1080         nfs4_init_opendata_res(opendata);
1081         ret = _nfs4_recover_proc_open(opendata);
1082         if (ret != 0)
1083                 return ret;
1084         newstate = nfs4_opendata_to_nfs4_state(opendata);
1085         if (IS_ERR(newstate))
1086                 return PTR_ERR(newstate);
1087         nfs4_close_state(&opendata->path, newstate, fmode);
1088         *res = newstate;
1089         return 0;
1090 }
1091
1092 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1093 {
1094         struct nfs4_state *newstate;
1095         int ret;
1096
1097         /* memory barrier prior to reading state->n_* */
1098         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1099         smp_rmb();
1100         if (state->n_rdwr != 0) {
1101                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1102                 if (ret != 0)
1103                         return ret;
1104                 if (newstate != state)
1105                         return -ESTALE;
1106         }
1107         if (state->n_wronly != 0) {
1108                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1109                 if (ret != 0)
1110                         return ret;
1111                 if (newstate != state)
1112                         return -ESTALE;
1113         }
1114         if (state->n_rdonly != 0) {
1115                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1116                 if (ret != 0)
1117                         return ret;
1118                 if (newstate != state)
1119                         return -ESTALE;
1120         }
1121         /*
1122          * We may have performed cached opens for all three recoveries.
1123          * Check if we need to update the current stateid.
1124          */
1125         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1126             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1127                 write_seqlock(&state->seqlock);
1128                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1129                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1130                 write_sequnlock(&state->seqlock);
1131         }
1132         return 0;
1133 }
1134
1135 /*
1136  * OPEN_RECLAIM:
1137  *      reclaim state on the server after a reboot.
1138  */
1139 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1140 {
1141         struct nfs_delegation *delegation;
1142         struct nfs4_opendata *opendata;
1143         fmode_t delegation_type = 0;
1144         int status;
1145
1146         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1147         if (IS_ERR(opendata))
1148                 return PTR_ERR(opendata);
1149         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1150         opendata->o_arg.fh = NFS_FH(state->inode);
1151         rcu_read_lock();
1152         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1153         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1154                 delegation_type = delegation->type;
1155         rcu_read_unlock();
1156         opendata->o_arg.u.delegation_type = delegation_type;
1157         status = nfs4_open_recover(opendata, state);
1158         nfs4_opendata_put(opendata);
1159         return status;
1160 }
1161
1162 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1163 {
1164         struct nfs_server *server = NFS_SERVER(state->inode);
1165         struct nfs4_exception exception = { };
1166         int err;
1167         do {
1168                 err = _nfs4_do_open_reclaim(ctx, state);
1169                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
1170                         break;
1171                 nfs4_handle_exception(server, err, &exception);
1172         } while (exception.retry);
1173         return err;
1174 }
1175
1176 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1177 {
1178         struct nfs_open_context *ctx;
1179         int ret;
1180
1181         ctx = nfs4_state_find_open_context(state);
1182         if (IS_ERR(ctx))
1183                 return PTR_ERR(ctx);
1184         ret = nfs4_do_open_reclaim(ctx, state);
1185         put_nfs_open_context(ctx);
1186         return ret;
1187 }
1188
1189 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1190 {
1191         struct nfs4_opendata *opendata;
1192         int ret;
1193
1194         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1195         if (IS_ERR(opendata))
1196                 return PTR_ERR(opendata);
1197         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1198         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1199                         sizeof(opendata->o_arg.u.delegation.data));
1200         ret = nfs4_open_recover(opendata, state);
1201         nfs4_opendata_put(opendata);
1202         return ret;
1203 }
1204
1205 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1206 {
1207         struct nfs4_exception exception = { };
1208         struct nfs_server *server = NFS_SERVER(state->inode);
1209         int err;
1210         do {
1211                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1212                 switch (err) {
1213                         case 0:
1214                         case -ENOENT:
1215                         case -ESTALE:
1216                                 goto out;
1217                         case -NFS4ERR_BADSESSION:
1218                         case -NFS4ERR_BADSLOT:
1219                         case -NFS4ERR_BAD_HIGH_SLOT:
1220                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1221                         case -NFS4ERR_DEADSESSION:
1222                                 nfs4_schedule_state_recovery(
1223                                         server->nfs_client);
1224                                 goto out;
1225                         case -NFS4ERR_STALE_CLIENTID:
1226                         case -NFS4ERR_STALE_STATEID:
1227                         case -NFS4ERR_EXPIRED:
1228                                 /* Don't recall a delegation if it was lost */
1229                                 nfs4_schedule_state_recovery(server->nfs_client);
1230                                 goto out;
1231                         case -ERESTARTSYS:
1232                                 /*
1233                                  * The show must go on: exit, but mark the
1234                                  * stateid as needing recovery.
1235                                  */
1236                         case -NFS4ERR_ADMIN_REVOKED:
1237                         case -NFS4ERR_BAD_STATEID:
1238                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1239                         case -ENOMEM:
1240                                 err = 0;
1241                                 goto out;
1242                 }
1243                 err = nfs4_handle_exception(server, err, &exception);
1244         } while (exception.retry);
1245 out:
1246         return err;
1247 }
1248
1249 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1250 {
1251         struct nfs4_opendata *data = calldata;
1252
1253         data->rpc_status = task->tk_status;
1254         if (RPC_ASSASSINATED(task))
1255                 return;
1256         if (data->rpc_status == 0) {
1257                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1258                                 sizeof(data->o_res.stateid.data));
1259                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1260                 renew_lease(data->o_res.server, data->timestamp);
1261                 data->rpc_done = 1;
1262         }
1263 }
1264
1265 static void nfs4_open_confirm_release(void *calldata)
1266 {
1267         struct nfs4_opendata *data = calldata;
1268         struct nfs4_state *state = NULL;
1269
1270         /* If this request hasn't been cancelled, do nothing */
1271         if (data->cancelled == 0)
1272                 goto out_free;
1273         /* In case of error, no cleanup! */
1274         if (!data->rpc_done)
1275                 goto out_free;
1276         state = nfs4_opendata_to_nfs4_state(data);
1277         if (!IS_ERR(state))
1278                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1279 out_free:
1280         nfs4_opendata_put(data);
1281 }
1282
1283 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1284         .rpc_call_done = nfs4_open_confirm_done,
1285         .rpc_release = nfs4_open_confirm_release,
1286 };
1287
1288 /*
1289  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1290  */
1291 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1292 {
1293         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1294         struct rpc_task *task;
1295         struct  rpc_message msg = {
1296                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1297                 .rpc_argp = &data->c_arg,
1298                 .rpc_resp = &data->c_res,
1299                 .rpc_cred = data->owner->so_cred,
1300         };
1301         struct rpc_task_setup task_setup_data = {
1302                 .rpc_client = server->client,
1303                 .rpc_message = &msg,
1304                 .callback_ops = &nfs4_open_confirm_ops,
1305                 .callback_data = data,
1306                 .workqueue = nfsiod_workqueue,
1307                 .flags = RPC_TASK_ASYNC,
1308         };
1309         int status;
1310
1311         kref_get(&data->kref);
1312         data->rpc_done = 0;
1313         data->rpc_status = 0;
1314         data->timestamp = jiffies;
1315         task = rpc_run_task(&task_setup_data);
1316         if (IS_ERR(task))
1317                 return PTR_ERR(task);
1318         status = nfs4_wait_for_completion_rpc_task(task);
1319         if (status != 0) {
1320                 data->cancelled = 1;
1321                 smp_wmb();
1322         } else
1323                 status = data->rpc_status;
1324         rpc_put_task(task);
1325         return status;
1326 }
1327
1328 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1329 {
1330         struct nfs4_opendata *data = calldata;
1331         struct nfs4_state_owner *sp = data->owner;
1332
1333         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1334                 return;
1335         /*
1336          * Check if we still need to send an OPEN call, or if we can use
1337          * a delegation instead.
1338          */
1339         if (data->state != NULL) {
1340                 struct nfs_delegation *delegation;
1341
1342                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1343                         goto out_no_action;
1344                 rcu_read_lock();
1345                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1346                 if (delegation != NULL &&
1347                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1348                         rcu_read_unlock();
1349                         goto out_no_action;
1350                 }
1351                 rcu_read_unlock();
1352         }
1353         /* Update sequence id. */
1354         data->o_arg.id = sp->so_owner_id.id;
1355         data->o_arg.clientid = sp->so_client->cl_clientid;
1356         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1357                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1358                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1359         }
1360         data->timestamp = jiffies;
1361         if (nfs4_setup_sequence(data->o_arg.server,
1362                                 &data->o_arg.seq_args,
1363                                 &data->o_res.seq_res, 1, task))
1364                 return;
1365         rpc_call_start(task);
1366         return;
1367 out_no_action:
1368         task->tk_action = NULL;
1369
1370 }
1371
1372 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1373 {
1374         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1375         nfs4_open_prepare(task, calldata);
1376 }
1377
1378 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1379 {
1380         struct nfs4_opendata *data = calldata;
1381
1382         data->rpc_status = task->tk_status;
1383
1384         nfs4_sequence_done(data->o_arg.server, &data->o_res.seq_res,
1385                         task->tk_status);
1386
1387         if (RPC_ASSASSINATED(task))
1388                 return;
1389         if (task->tk_status == 0) {
1390                 switch (data->o_res.f_attr->mode & S_IFMT) {
1391                         case S_IFREG:
1392                                 break;
1393                         case S_IFLNK:
1394                                 data->rpc_status = -ELOOP;
1395                                 break;
1396                         case S_IFDIR:
1397                                 data->rpc_status = -EISDIR;
1398                                 break;
1399                         default:
1400                                 data->rpc_status = -ENOTDIR;
1401                 }
1402                 renew_lease(data->o_res.server, data->timestamp);
1403                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1404                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1405         }
1406         data->rpc_done = 1;
1407 }
1408
1409 static void nfs4_open_release(void *calldata)
1410 {
1411         struct nfs4_opendata *data = calldata;
1412         struct nfs4_state *state = NULL;
1413
1414         /* If this request hasn't been cancelled, do nothing */
1415         if (data->cancelled == 0)
1416                 goto out_free;
1417         /* In case of error, no cleanup! */
1418         if (data->rpc_status != 0 || !data->rpc_done)
1419                 goto out_free;
1420         /* In case we need an open_confirm, no cleanup! */
1421         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1422                 goto out_free;
1423         state = nfs4_opendata_to_nfs4_state(data);
1424         if (!IS_ERR(state))
1425                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1426 out_free:
1427         nfs4_opendata_put(data);
1428 }
1429
1430 static const struct rpc_call_ops nfs4_open_ops = {
1431         .rpc_call_prepare = nfs4_open_prepare,
1432         .rpc_call_done = nfs4_open_done,
1433         .rpc_release = nfs4_open_release,
1434 };
1435
1436 static const struct rpc_call_ops nfs4_recover_open_ops = {
1437         .rpc_call_prepare = nfs4_recover_open_prepare,
1438         .rpc_call_done = nfs4_open_done,
1439         .rpc_release = nfs4_open_release,
1440 };
1441
1442 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1443 {
1444         struct inode *dir = data->dir->d_inode;
1445         struct nfs_server *server = NFS_SERVER(dir);
1446         struct nfs_openargs *o_arg = &data->o_arg;
1447         struct nfs_openres *o_res = &data->o_res;
1448         struct rpc_task *task;
1449         struct rpc_message msg = {
1450                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1451                 .rpc_argp = o_arg,
1452                 .rpc_resp = o_res,
1453                 .rpc_cred = data->owner->so_cred,
1454         };
1455         struct rpc_task_setup task_setup_data = {
1456                 .rpc_client = server->client,
1457                 .rpc_message = &msg,
1458                 .callback_ops = &nfs4_open_ops,
1459                 .callback_data = data,
1460                 .workqueue = nfsiod_workqueue,
1461                 .flags = RPC_TASK_ASYNC,
1462         };
1463         int status;
1464
1465         kref_get(&data->kref);
1466         data->rpc_done = 0;
1467         data->rpc_status = 0;
1468         data->cancelled = 0;
1469         if (isrecover)
1470                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1471         task = rpc_run_task(&task_setup_data);
1472         if (IS_ERR(task))
1473                 return PTR_ERR(task);
1474         status = nfs4_wait_for_completion_rpc_task(task);
1475         if (status != 0) {
1476                 data->cancelled = 1;
1477                 smp_wmb();
1478         } else
1479                 status = data->rpc_status;
1480         rpc_put_task(task);
1481
1482         return status;
1483 }
1484
1485 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1486 {
1487         struct inode *dir = data->dir->d_inode;
1488         struct nfs_openres *o_res = &data->o_res;
1489         int status;
1490
1491         status = nfs4_run_open_task(data, 1);
1492         if (status != 0 || !data->rpc_done)
1493                 return status;
1494
1495         nfs_refresh_inode(dir, o_res->dir_attr);
1496
1497         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1498                 status = _nfs4_proc_open_confirm(data);
1499                 if (status != 0)
1500                         return status;
1501         }
1502
1503         return status;
1504 }
1505
1506 /*
1507  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1508  */
1509 static int _nfs4_proc_open(struct nfs4_opendata *data)
1510 {
1511         struct inode *dir = data->dir->d_inode;
1512         struct nfs_server *server = NFS_SERVER(dir);
1513         struct nfs_openargs *o_arg = &data->o_arg;
1514         struct nfs_openres *o_res = &data->o_res;
1515         int status;
1516
1517         status = nfs4_run_open_task(data, 0);
1518         if (status != 0 || !data->rpc_done)
1519                 return status;
1520
1521         if (o_arg->open_flags & O_CREAT) {
1522                 update_changeattr(dir, &o_res->cinfo);
1523                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1524         } else
1525                 nfs_refresh_inode(dir, o_res->dir_attr);
1526         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1527                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1528         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1529                 status = _nfs4_proc_open_confirm(data);
1530                 if (status != 0)
1531                         return status;
1532         }
1533         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1534                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1535         return 0;
1536 }
1537
1538 static int nfs4_recover_expired_lease(struct nfs_server *server)
1539 {
1540         struct nfs_client *clp = server->nfs_client;
1541         unsigned int loop;
1542         int ret;
1543
1544         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1545                 ret = nfs4_wait_clnt_recover(clp);
1546                 if (ret != 0)
1547                         break;
1548                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1549                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1550                         break;
1551                 nfs4_schedule_state_recovery(clp);
1552                 ret = -EIO;
1553         }
1554         return ret;
1555 }
1556
1557 /*
1558  * OPEN_EXPIRED:
1559  *      reclaim state on the server after a network partition.
1560  *      Assumes caller holds the appropriate lock
1561  */
1562 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1563 {
1564         struct nfs4_opendata *opendata;
1565         int ret;
1566
1567         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1568         if (IS_ERR(opendata))
1569                 return PTR_ERR(opendata);
1570         ret = nfs4_open_recover(opendata, state);
1571         if (ret == -ESTALE)
1572                 d_drop(ctx->path.dentry);
1573         nfs4_opendata_put(opendata);
1574         return ret;
1575 }
1576
1577 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1578 {
1579         struct nfs_server *server = NFS_SERVER(state->inode);
1580         struct nfs4_exception exception = { };
1581         int err;
1582
1583         do {
1584                 err = _nfs4_open_expired(ctx, state);
1585                 switch (err) {
1586                 default:
1587                         goto out;
1588                 case -NFS4ERR_GRACE:
1589                 case -NFS4ERR_DELAY:
1590                 case -EKEYEXPIRED:
1591                         nfs4_handle_exception(server, err, &exception);
1592                         err = 0;
1593                 }
1594         } while (exception.retry);
1595 out:
1596         return err;
1597 }
1598
1599 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1600 {
1601         struct nfs_open_context *ctx;
1602         int ret;
1603
1604         ctx = nfs4_state_find_open_context(state);
1605         if (IS_ERR(ctx))
1606                 return PTR_ERR(ctx);
1607         ret = nfs4_do_open_expired(ctx, state);
1608         put_nfs_open_context(ctx);
1609         return ret;
1610 }
1611
1612 /*
1613  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1614  * fields corresponding to attributes that were used to store the verifier.
1615  * Make sure we clobber those fields in the later setattr call
1616  */
1617 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1618 {
1619         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1620             !(sattr->ia_valid & ATTR_ATIME_SET))
1621                 sattr->ia_valid |= ATTR_ATIME;
1622
1623         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1624             !(sattr->ia_valid & ATTR_MTIME_SET))
1625                 sattr->ia_valid |= ATTR_MTIME;
1626 }
1627
1628 /*
1629  * Returns a referenced nfs4_state
1630  */
1631 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1632 {
1633         struct nfs4_state_owner  *sp;
1634         struct nfs4_state     *state = NULL;
1635         struct nfs_server       *server = NFS_SERVER(dir);
1636         struct nfs4_opendata *opendata;
1637         int status;
1638
1639         /* Protect against reboot recovery conflicts */
1640         status = -ENOMEM;
1641         if (!(sp = nfs4_get_state_owner(server, cred))) {
1642                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1643                 goto out_err;
1644         }
1645         status = nfs4_recover_expired_lease(server);
1646         if (status != 0)
1647                 goto err_put_state_owner;
1648         if (path->dentry->d_inode != NULL)
1649                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1650         status = -ENOMEM;
1651         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1652         if (opendata == NULL)
1653                 goto err_put_state_owner;
1654
1655         if (path->dentry->d_inode != NULL)
1656                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1657
1658         status = _nfs4_proc_open(opendata);
1659         if (status != 0)
1660                 goto err_opendata_put;
1661
1662         state = nfs4_opendata_to_nfs4_state(opendata);
1663         status = PTR_ERR(state);
1664         if (IS_ERR(state))
1665                 goto err_opendata_put;
1666         if (server->caps & NFS_CAP_POSIX_LOCK)
1667                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1668
1669         if (opendata->o_arg.open_flags & O_EXCL) {
1670                 nfs4_exclusive_attrset(opendata, sattr);
1671
1672                 nfs_fattr_init(opendata->o_res.f_attr);
1673                 status = nfs4_do_setattr(state->inode, cred,
1674                                 opendata->o_res.f_attr, sattr,
1675                                 state);
1676                 if (status == 0)
1677                         nfs_setattr_update_inode(state->inode, sattr);
1678                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1679         }
1680         nfs4_opendata_put(opendata);
1681         nfs4_put_state_owner(sp);
1682         *res = state;
1683         return 0;
1684 err_opendata_put:
1685         nfs4_opendata_put(opendata);
1686 err_put_state_owner:
1687         nfs4_put_state_owner(sp);
1688 out_err:
1689         *res = NULL;
1690         return status;
1691 }
1692
1693
1694 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1695 {
1696         struct nfs4_exception exception = { };
1697         struct nfs4_state *res;
1698         int status;
1699
1700         do {
1701                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1702                 if (status == 0)
1703                         break;
1704                 /* NOTE: BAD_SEQID means the server and client disagree about the
1705                  * book-keeping w.r.t. state-changing operations
1706                  * (OPEN/CLOSE/LOCK/LOCKU...)
1707                  * It is actually a sign of a bug on the client or on the server.
1708                  *
1709                  * If we receive a BAD_SEQID error in the particular case of
1710                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1711                  * have unhashed the old state_owner for us, and that we can
1712                  * therefore safely retry using a new one. We should still warn
1713                  * the user though...
1714                  */
1715                 if (status == -NFS4ERR_BAD_SEQID) {
1716                         printk(KERN_WARNING "NFS: v4 server %s "
1717                                         " returned a bad sequence-id error!\n",
1718                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1719                         exception.retry = 1;
1720                         continue;
1721                 }
1722                 /*
1723                  * BAD_STATEID on OPEN means that the server cancelled our
1724                  * state before it received the OPEN_CONFIRM.
1725                  * Recover by retrying the request as per the discussion
1726                  * on Page 181 of RFC3530.
1727                  */
1728                 if (status == -NFS4ERR_BAD_STATEID) {
1729                         exception.retry = 1;
1730                         continue;
1731                 }
1732                 if (status == -EAGAIN) {
1733                         /* We must have found a delegation */
1734                         exception.retry = 1;
1735                         continue;
1736                 }
1737                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1738                                         status, &exception));
1739         } while (exception.retry);
1740         return res;
1741 }
1742
1743 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1744                             struct nfs_fattr *fattr, struct iattr *sattr,
1745                             struct nfs4_state *state)
1746 {
1747         struct nfs_server *server = NFS_SERVER(inode);
1748         struct nfs_setattrargs  arg = {
1749                 .fh             = NFS_FH(inode),
1750                 .iap            = sattr,
1751                 .server         = server,
1752                 .bitmask = server->attr_bitmask,
1753         };
1754         struct nfs_setattrres  res = {
1755                 .fattr          = fattr,
1756                 .server         = server,
1757         };
1758         struct rpc_message msg = {
1759                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1760                 .rpc_argp       = &arg,
1761                 .rpc_resp       = &res,
1762                 .rpc_cred       = cred,
1763         };
1764         unsigned long timestamp = jiffies;
1765         int status;
1766
1767         nfs_fattr_init(fattr);
1768
1769         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1770                 /* Use that stateid */
1771         } else if (state != NULL) {
1772                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1773         } else
1774                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1775
1776         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1777         if (status == 0 && state != NULL)
1778                 renew_lease(server, timestamp);
1779         return status;
1780 }
1781
1782 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1783                            struct nfs_fattr *fattr, struct iattr *sattr,
1784                            struct nfs4_state *state)
1785 {
1786         struct nfs_server *server = NFS_SERVER(inode);
1787         struct nfs4_exception exception = { };
1788         int err;
1789         do {
1790                 err = nfs4_handle_exception(server,
1791                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1792                                 &exception);
1793         } while (exception.retry);
1794         return err;
1795 }
1796
1797 struct nfs4_closedata {
1798         struct path path;
1799         struct inode *inode;
1800         struct nfs4_state *state;
1801         struct nfs_closeargs arg;
1802         struct nfs_closeres res;
1803         struct nfs_fattr fattr;
1804         unsigned long timestamp;
1805 };
1806
1807 static void nfs4_free_closedata(void *data)
1808 {
1809         struct nfs4_closedata *calldata = data;
1810         struct nfs4_state_owner *sp = calldata->state->owner;
1811
1812         nfs4_put_open_state(calldata->state);
1813         nfs_free_seqid(calldata->arg.seqid);
1814         nfs4_put_state_owner(sp);
1815         path_put(&calldata->path);
1816         kfree(calldata);
1817 }
1818
1819 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1820                 fmode_t fmode)
1821 {
1822         spin_lock(&state->owner->so_lock);
1823         if (!(fmode & FMODE_READ))
1824                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1825         if (!(fmode & FMODE_WRITE))
1826                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1827         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1828         spin_unlock(&state->owner->so_lock);
1829 }
1830
1831 static void nfs4_close_done(struct rpc_task *task, void *data)
1832 {
1833         struct nfs4_closedata *calldata = data;
1834         struct nfs4_state *state = calldata->state;
1835         struct nfs_server *server = NFS_SERVER(calldata->inode);
1836
1837         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1838         if (RPC_ASSASSINATED(task))
1839                 return;
1840         /* hmm. we are done with the inode, and in the process of freeing
1841          * the state_owner. we keep this around to process errors
1842          */
1843         switch (task->tk_status) {
1844                 case 0:
1845                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1846                         renew_lease(server, calldata->timestamp);
1847                         nfs4_close_clear_stateid_flags(state,
1848                                         calldata->arg.fmode);
1849                         break;
1850                 case -NFS4ERR_STALE_STATEID:
1851                 case -NFS4ERR_OLD_STATEID:
1852                 case -NFS4ERR_BAD_STATEID:
1853                 case -NFS4ERR_EXPIRED:
1854                         if (calldata->arg.fmode == 0)
1855                                 break;
1856                 default:
1857                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1858                                 rpc_restart_call_prepare(task);
1859         }
1860         nfs_release_seqid(calldata->arg.seqid);
1861         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1862 }
1863
1864 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1865 {
1866         struct nfs4_closedata *calldata = data;
1867         struct nfs4_state *state = calldata->state;
1868         int call_close = 0;
1869
1870         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1871                 return;
1872
1873         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1874         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1875         spin_lock(&state->owner->so_lock);
1876         /* Calculate the change in open mode */
1877         if (state->n_rdwr == 0) {
1878                 if (state->n_rdonly == 0) {
1879                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1880                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1881                         calldata->arg.fmode &= ~FMODE_READ;
1882                 }
1883                 if (state->n_wronly == 0) {
1884                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1885                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1886                         calldata->arg.fmode &= ~FMODE_WRITE;
1887                 }
1888         }
1889         spin_unlock(&state->owner->so_lock);
1890
1891         if (!call_close) {
1892                 /* Note: exit _without_ calling nfs4_close_done */
1893                 task->tk_action = NULL;
1894                 return;
1895         }
1896
1897         if (calldata->arg.fmode == 0)
1898                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1899
1900         nfs_fattr_init(calldata->res.fattr);
1901         calldata->timestamp = jiffies;
1902         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1903                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1904                                 1, task))
1905                 return;
1906         rpc_call_start(task);
1907 }
1908
1909 static const struct rpc_call_ops nfs4_close_ops = {
1910         .rpc_call_prepare = nfs4_close_prepare,
1911         .rpc_call_done = nfs4_close_done,
1912         .rpc_release = nfs4_free_closedata,
1913 };
1914
1915 /*
1916  * It is possible for data to be read/written from a mem-mapped file
1917  * after the sys_close call (which hits the vfs layer as a flush).
1918  * This means that we can't safely call nfsv4 close on a file until
1919  * the inode is cleared. This in turn means that we are not good
1920  * NFSv4 citizens - we do not indicate to the server to update the file's
1921  * share state even when we are done with one of the three share
1922  * stateid's in the inode.
1923  *
1924  * NOTE: Caller must be holding the sp->so_owner semaphore!
1925  */
1926 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait)
1927 {
1928         struct nfs_server *server = NFS_SERVER(state->inode);
1929         struct nfs4_closedata *calldata;
1930         struct nfs4_state_owner *sp = state->owner;
1931         struct rpc_task *task;
1932         struct rpc_message msg = {
1933                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1934                 .rpc_cred = state->owner->so_cred,
1935         };
1936         struct rpc_task_setup task_setup_data = {
1937                 .rpc_client = server->client,
1938                 .rpc_message = &msg,
1939                 .callback_ops = &nfs4_close_ops,
1940                 .workqueue = nfsiod_workqueue,
1941                 .flags = RPC_TASK_ASYNC,
1942         };
1943         int status = -ENOMEM;
1944
1945         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1946         if (calldata == NULL)
1947                 goto out;
1948         calldata->inode = state->inode;
1949         calldata->state = state;
1950         calldata->arg.fh = NFS_FH(state->inode);
1951         calldata->arg.stateid = &state->open_stateid;
1952         /* Serialization for the sequence id */
1953         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
1954         if (calldata->arg.seqid == NULL)
1955                 goto out_free_calldata;
1956         calldata->arg.fmode = 0;
1957         calldata->arg.bitmask = server->cache_consistency_bitmask;
1958         calldata->res.fattr = &calldata->fattr;
1959         calldata->res.seqid = calldata->arg.seqid;
1960         calldata->res.server = server;
1961         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1962         path_get(path);
1963         calldata->path = *path;
1964
1965         msg.rpc_argp = &calldata->arg,
1966         msg.rpc_resp = &calldata->res,
1967         task_setup_data.callback_data = calldata;
1968         task = rpc_run_task(&task_setup_data);
1969         if (IS_ERR(task))
1970                 return PTR_ERR(task);
1971         status = 0;
1972         if (wait)
1973                 status = rpc_wait_for_completion_task(task);
1974         rpc_put_task(task);
1975         return status;
1976 out_free_calldata:
1977         kfree(calldata);
1978 out:
1979         nfs4_put_open_state(state);
1980         nfs4_put_state_owner(sp);
1981         return status;
1982 }
1983
1984 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1985 {
1986         struct file *filp;
1987         int ret;
1988
1989         /* If the open_intent is for execute, we have an extra check to make */
1990         if (fmode & FMODE_EXEC) {
1991                 ret = nfs_may_open(state->inode,
1992                                 state->owner->so_cred,
1993                                 nd->intent.open.flags);
1994                 if (ret < 0)
1995                         goto out_close;
1996         }
1997         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1998         if (!IS_ERR(filp)) {
1999                 struct nfs_open_context *ctx;
2000                 ctx = nfs_file_open_context(filp);
2001                 ctx->state = state;
2002                 return 0;
2003         }
2004         ret = PTR_ERR(filp);
2005 out_close:
2006         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
2007         return ret;
2008 }
2009
2010 struct dentry *
2011 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
2012 {
2013         struct path path = {
2014                 .mnt = nd->path.mnt,
2015                 .dentry = dentry,
2016         };
2017         struct dentry *parent;
2018         struct iattr attr;
2019         struct rpc_cred *cred;
2020         struct nfs4_state *state;
2021         struct dentry *res;
2022         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
2023
2024         if (nd->flags & LOOKUP_CREATE) {
2025                 attr.ia_mode = nd->intent.open.create_mode;
2026                 attr.ia_valid = ATTR_MODE;
2027                 if (!IS_POSIXACL(dir))
2028                         attr.ia_mode &= ~current_umask();
2029         } else {
2030                 attr.ia_valid = 0;
2031                 BUG_ON(nd->intent.open.flags & O_CREAT);
2032         }
2033
2034         cred = rpc_lookup_cred();
2035         if (IS_ERR(cred))
2036                 return (struct dentry *)cred;
2037         parent = dentry->d_parent;
2038         /* Protect against concurrent sillydeletes */
2039         nfs_block_sillyrename(parent);
2040         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
2041         put_rpccred(cred);
2042         if (IS_ERR(state)) {
2043                 if (PTR_ERR(state) == -ENOENT) {
2044                         d_add(dentry, NULL);
2045                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2046                 }
2047                 nfs_unblock_sillyrename(parent);
2048                 return (struct dentry *)state;
2049         }
2050         res = d_add_unique(dentry, igrab(state->inode));
2051         if (res != NULL)
2052                 path.dentry = res;
2053         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
2054         nfs_unblock_sillyrename(parent);
2055         nfs4_intent_set_file(nd, &path, state, fmode);
2056         return res;
2057 }
2058
2059 int
2060 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
2061 {
2062         struct path path = {
2063                 .mnt = nd->path.mnt,
2064                 .dentry = dentry,
2065         };
2066         struct rpc_cred *cred;
2067         struct nfs4_state *state;
2068         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
2069
2070         cred = rpc_lookup_cred();
2071         if (IS_ERR(cred))
2072                 return PTR_ERR(cred);
2073         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
2074         put_rpccred(cred);
2075         if (IS_ERR(state)) {
2076                 switch (PTR_ERR(state)) {
2077                         case -EPERM:
2078                         case -EACCES:
2079                         case -EDQUOT:
2080                         case -ENOSPC:
2081                         case -EROFS:
2082                                 return PTR_ERR(state);
2083                         default:
2084                                 goto out_drop;
2085                 }
2086         }
2087         if (state->inode == dentry->d_inode) {
2088                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2089                 nfs4_intent_set_file(nd, &path, state, fmode);
2090                 return 1;
2091         }
2092         nfs4_close_sync(&path, state, fmode);
2093 out_drop:
2094         d_drop(dentry);
2095         return 0;
2096 }
2097
2098 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2099 {
2100         if (ctx->state == NULL)
2101                 return;
2102         if (is_sync)
2103                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2104         else
2105                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2106 }
2107
2108 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2109 {
2110         struct nfs4_server_caps_arg args = {
2111                 .fhandle = fhandle,
2112         };
2113         struct nfs4_server_caps_res res = {};
2114         struct rpc_message msg = {
2115                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2116                 .rpc_argp = &args,
2117                 .rpc_resp = &res,
2118         };
2119         int status;
2120
2121         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2122         if (status == 0) {
2123                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2124                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2125                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2126                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2127                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2128                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2129                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2130                         server->caps |= NFS_CAP_ACLS;
2131                 if (res.has_links != 0)
2132                         server->caps |= NFS_CAP_HARDLINKS;
2133                 if (res.has_symlinks != 0)
2134                         server->caps |= NFS_CAP_SYMLINKS;
2135                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2136                         server->caps |= NFS_CAP_FILEID;
2137                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2138                         server->caps |= NFS_CAP_MODE;
2139                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2140                         server->caps |= NFS_CAP_NLINK;
2141                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2142                         server->caps |= NFS_CAP_OWNER;
2143                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2144                         server->caps |= NFS_CAP_OWNER_GROUP;
2145                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2146                         server->caps |= NFS_CAP_ATIME;
2147                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2148                         server->caps |= NFS_CAP_CTIME;
2149                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2150                         server->caps |= NFS_CAP_MTIME;
2151
2152                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2153                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2154                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2155                 server->acl_bitmask = res.acl_bitmask;
2156         }
2157
2158         return status;
2159 }
2160
2161 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2162 {
2163         struct nfs4_exception exception = { };
2164         int err;
2165         do {
2166                 err = nfs4_handle_exception(server,
2167                                 _nfs4_server_capabilities(server, fhandle),
2168                                 &exception);
2169         } while (exception.retry);
2170         return err;
2171 }
2172
2173 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2174                 struct nfs_fsinfo *info)
2175 {
2176         struct nfs4_lookup_root_arg args = {
2177                 .bitmask = nfs4_fattr_bitmap,
2178         };
2179         struct nfs4_lookup_res res = {
2180                 .server = server,
2181                 .fattr = info->fattr,
2182                 .fh = fhandle,
2183         };
2184         struct rpc_message msg = {
2185                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2186                 .rpc_argp = &args,
2187                 .rpc_resp = &res,
2188         };
2189
2190         nfs_fattr_init(info->fattr);
2191         return nfs4_call_sync(server, &msg, &args, &res, 0);
2192 }
2193
2194 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2195                 struct nfs_fsinfo *info)
2196 {
2197         struct nfs4_exception exception = { };
2198         int err;
2199         do {
2200                 err = nfs4_handle_exception(server,
2201                                 _nfs4_lookup_root(server, fhandle, info),
2202                                 &exception);
2203         } while (exception.retry);
2204         return err;
2205 }
2206
2207 /*
2208  * get the file handle for the "/" directory on the server
2209  */
2210 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2211                               struct nfs_fsinfo *info)
2212 {
2213         int status;
2214
2215         status = nfs4_lookup_root(server, fhandle, info);
2216         if (status == 0)
2217                 status = nfs4_server_capabilities(server, fhandle);
2218         if (status == 0)
2219                 status = nfs4_do_fsinfo(server, fhandle, info);
2220         return nfs4_map_errors(status);
2221 }
2222
2223 /*
2224  * Get locations and (maybe) other attributes of a referral.
2225  * Note that we'll actually follow the referral later when
2226  * we detect fsid mismatch in inode revalidation
2227  */
2228 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2229 {
2230         int status = -ENOMEM;
2231         struct page *page = NULL;
2232         struct nfs4_fs_locations *locations = NULL;
2233
2234         page = alloc_page(GFP_KERNEL);
2235         if (page == NULL)
2236                 goto out;
2237         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2238         if (locations == NULL)
2239                 goto out;
2240
2241         status = nfs4_proc_fs_locations(dir, name, locations, page);
2242         if (status != 0)
2243                 goto out;
2244         /* Make sure server returned a different fsid for the referral */
2245         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2246                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2247                 status = -EIO;
2248                 goto out;
2249         }
2250
2251         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2252         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2253         if (!fattr->mode)
2254                 fattr->mode = S_IFDIR;
2255         memset(fhandle, 0, sizeof(struct nfs_fh));
2256 out:
2257         if (page)
2258                 __free_page(page);
2259         if (locations)
2260                 kfree(locations);
2261         return status;
2262 }
2263
2264 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2265 {
2266         struct nfs4_getattr_arg args = {
2267                 .fh = fhandle,
2268                 .bitmask = server->attr_bitmask,
2269         };
2270         struct nfs4_getattr_res res = {
2271                 .fattr = fattr,
2272                 .server = server,
2273         };
2274         struct rpc_message msg = {
2275                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2276                 .rpc_argp = &args,
2277                 .rpc_resp = &res,
2278         };
2279
2280         nfs_fattr_init(fattr);
2281         return nfs4_call_sync(server, &msg, &args, &res, 0);
2282 }
2283
2284 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2285 {
2286         struct nfs4_exception exception = { };
2287         int err;
2288         do {
2289                 err = nfs4_handle_exception(server,
2290                                 _nfs4_proc_getattr(server, fhandle, fattr),
2291                                 &exception);
2292         } while (exception.retry);
2293         return err;
2294 }
2295
2296 /*
2297  * The file is not closed if it is opened due to the a request to change
2298  * the size of the file. The open call will not be needed once the
2299  * VFS layer lookup-intents are implemented.
2300  *
2301  * Close is called when the inode is destroyed.
2302  * If we haven't opened the file for O_WRONLY, we
2303  * need to in the size_change case to obtain a stateid.
2304  *
2305  * Got race?
2306  * Because OPEN is always done by name in nfsv4, it is
2307  * possible that we opened a different file by the same
2308  * name.  We can recognize this race condition, but we
2309  * can't do anything about it besides returning an error.
2310  *
2311  * This will be fixed with VFS changes (lookup-intent).
2312  */
2313 static int
2314 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2315                   struct iattr *sattr)
2316 {
2317         struct inode *inode = dentry->d_inode;
2318         struct rpc_cred *cred = NULL;
2319         struct nfs4_state *state = NULL;
2320         int status;
2321
2322         nfs_fattr_init(fattr);
2323
2324         /* Search for an existing open(O_WRITE) file */
2325         if (sattr->ia_valid & ATTR_FILE) {
2326                 struct nfs_open_context *ctx;
2327
2328                 ctx = nfs_file_open_context(sattr->ia_file);
2329                 if (ctx) {
2330                         cred = ctx->cred;
2331                         state = ctx->state;
2332                 }
2333         }
2334
2335         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2336         if (status == 0)
2337                 nfs_setattr_update_inode(inode, sattr);
2338         return status;
2339 }
2340
2341 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2342                 const struct qstr *name, struct nfs_fh *fhandle,
2343                 struct nfs_fattr *fattr)
2344 {
2345         int                    status;
2346         struct nfs4_lookup_arg args = {
2347                 .bitmask = server->attr_bitmask,
2348                 .dir_fh = dirfh,
2349                 .name = name,
2350         };
2351         struct nfs4_lookup_res res = {
2352                 .server = server,
2353                 .fattr = fattr,
2354                 .fh = fhandle,
2355         };
2356         struct rpc_message msg = {
2357                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2358                 .rpc_argp = &args,
2359                 .rpc_resp = &res,
2360         };
2361
2362         nfs_fattr_init(fattr);
2363
2364         dprintk("NFS call  lookupfh %s\n", name->name);
2365         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2366         dprintk("NFS reply lookupfh: %d\n", status);
2367         return status;
2368 }
2369
2370 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2371                               struct qstr *name, struct nfs_fh *fhandle,
2372                               struct nfs_fattr *fattr)
2373 {
2374         struct nfs4_exception exception = { };
2375         int err;
2376         do {
2377                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2378                 /* FIXME: !!!! */
2379                 if (err == -NFS4ERR_MOVED) {
2380                         err = -EREMOTE;
2381                         break;
2382                 }
2383                 err = nfs4_handle_exception(server, err, &exception);
2384         } while (exception.retry);
2385         return err;
2386 }
2387
2388 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2389                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2390 {
2391         int status;
2392
2393         dprintk("NFS call  lookup %s\n", name->name);
2394         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2395         if (status == -NFS4ERR_MOVED)
2396                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2397         dprintk("NFS reply lookup: %d\n", status);
2398         return status;
2399 }
2400
2401 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2402 {
2403         struct nfs4_exception exception = { };
2404         int err;
2405         do {
2406                 err = nfs4_handle_exception(NFS_SERVER(dir),
2407                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2408                                 &exception);
2409         } while (exception.retry);
2410         return err;
2411 }
2412
2413 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2414 {
2415         struct nfs_server *server = NFS_SERVER(inode);
2416         struct nfs4_accessargs args = {
2417                 .fh = NFS_FH(inode),
2418                 .bitmask = server->attr_bitmask,
2419         };
2420         struct nfs4_accessres res = {
2421                 .server = server,
2422         };
2423         struct rpc_message msg = {
2424                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2425                 .rpc_argp = &args,
2426                 .rpc_resp = &res,
2427                 .rpc_cred = entry->cred,
2428         };
2429         int mode = entry->mask;
2430         int status;
2431
2432         /*
2433          * Determine which access bits we want to ask for...
2434          */
2435         if (mode & MAY_READ)
2436                 args.access |= NFS4_ACCESS_READ;
2437         if (S_ISDIR(inode->i_mode)) {
2438                 if (mode & MAY_WRITE)
2439                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2440                 if (mode & MAY_EXEC)
2441                         args.access |= NFS4_ACCESS_LOOKUP;
2442         } else {
2443                 if (mode & MAY_WRITE)
2444                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2445                 if (mode & MAY_EXEC)
2446                         args.access |= NFS4_ACCESS_EXECUTE;
2447         }
2448
2449         res.fattr = nfs_alloc_fattr();
2450         if (res.fattr == NULL)
2451                 return -ENOMEM;
2452
2453         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2454         if (!status) {
2455                 entry->mask = 0;
2456                 if (res.access & NFS4_ACCESS_READ)
2457                         entry->mask |= MAY_READ;
2458                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2459                         entry->mask |= MAY_WRITE;
2460                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2461                         entry->mask |= MAY_EXEC;
2462                 nfs_refresh_inode(inode, res.fattr);
2463         }
2464         nfs_free_fattr(res.fattr);
2465         return status;
2466 }
2467
2468 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2469 {
2470         struct nfs4_exception exception = { };
2471         int err;
2472         do {
2473                 err = nfs4_handle_exception(NFS_SERVER(inode),
2474                                 _nfs4_proc_access(inode, entry),
2475                                 &exception);
2476         } while (exception.retry);
2477         return err;
2478 }
2479
2480 /*
2481  * TODO: For the time being, we don't try to get any attributes
2482  * along with any of the zero-copy operations READ, READDIR,
2483  * READLINK, WRITE.
2484  *
2485  * In the case of the first three, we want to put the GETATTR
2486  * after the read-type operation -- this is because it is hard
2487  * to predict the length of a GETATTR response in v4, and thus
2488  * align the READ data correctly.  This means that the GETATTR
2489  * may end up partially falling into the page cache, and we should
2490  * shift it into the 'tail' of the xdr_buf before processing.
2491  * To do this efficiently, we need to know the total length
2492  * of data received, which doesn't seem to be available outside
2493  * of the RPC layer.
2494  *
2495  * In the case of WRITE, we also want to put the GETATTR after
2496  * the operation -- in this case because we want to make sure
2497  * we get the post-operation mtime and size.  This means that
2498  * we can't use xdr_encode_pages() as written: we need a variant
2499  * of it which would leave room in the 'tail' iovec.
2500  *
2501  * Both of these changes to the XDR layer would in fact be quite
2502  * minor, but I decided to leave them for a subsequent patch.
2503  */
2504 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2505                 unsigned int pgbase, unsigned int pglen)
2506 {
2507         struct nfs4_readlink args = {
2508                 .fh       = NFS_FH(inode),
2509                 .pgbase   = pgbase,
2510                 .pglen    = pglen,
2511                 .pages    = &page,
2512         };
2513         struct nfs4_readlink_res res;
2514         struct rpc_message msg = {
2515                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2516                 .rpc_argp = &args,
2517                 .rpc_resp = &res,
2518         };
2519
2520         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2521 }
2522
2523 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2524                 unsigned int pgbase, unsigned int pglen)
2525 {
2526         struct nfs4_exception exception = { };
2527         int err;
2528         do {
2529                 err = nfs4_handle_exception(NFS_SERVER(inode),
2530                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2531                                 &exception);
2532         } while (exception.retry);
2533         return err;
2534 }
2535
2536 /*
2537  * Got race?
2538  * We will need to arrange for the VFS layer to provide an atomic open.
2539  * Until then, this create/open method is prone to inefficiency and race
2540  * conditions due to the lookup, create, and open VFS calls from sys_open()
2541  * placed on the wire.
2542  *
2543  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2544  * The file will be opened again in the subsequent VFS open call
2545  * (nfs4_proc_file_open).
2546  *
2547  * The open for read will just hang around to be used by any process that
2548  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2549  */
2550
2551 static int
2552 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2553                  int flags, struct nameidata *nd)
2554 {
2555         struct path path = {
2556                 .mnt = nd->path.mnt,
2557                 .dentry = dentry,
2558         };
2559         struct nfs4_state *state;
2560         struct rpc_cred *cred;
2561         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2562         int status = 0;
2563
2564         cred = rpc_lookup_cred();
2565         if (IS_ERR(cred)) {
2566                 status = PTR_ERR(cred);
2567                 goto out;
2568         }
2569         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2570         d_drop(dentry);
2571         if (IS_ERR(state)) {
2572                 status = PTR_ERR(state);
2573                 goto out_putcred;
2574         }
2575         d_add(dentry, igrab(state->inode));
2576         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2577         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2578                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2579         else
2580                 nfs4_close_sync(&path, state, fmode);
2581 out_putcred:
2582         put_rpccred(cred);
2583 out:
2584         return status;
2585 }
2586
2587 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2588 {
2589         struct nfs_server *server = NFS_SERVER(dir);
2590         struct nfs_removeargs args = {
2591                 .fh = NFS_FH(dir),
2592                 .name.len = name->len,
2593                 .name.name = name->name,
2594                 .bitmask = server->attr_bitmask,
2595         };
2596         struct nfs_removeres res = {
2597                 .server = server,
2598         };
2599         struct rpc_message msg = {
2600                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2601                 .rpc_argp = &args,
2602                 .rpc_resp = &res,
2603         };
2604         int status = -ENOMEM;
2605
2606         res.dir_attr = nfs_alloc_fattr();
2607         if (res.dir_attr == NULL)
2608                 goto out;
2609
2610         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2611         if (status == 0) {
2612                 update_changeattr(dir, &res.cinfo);
2613                 nfs_post_op_update_inode(dir, res.dir_attr);
2614         }
2615         nfs_free_fattr(res.dir_attr);
2616 out:
2617         return status;
2618 }
2619
2620 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2621 {
2622         struct nfs4_exception exception = { };
2623         int err;
2624         do {
2625                 err = nfs4_handle_exception(NFS_SERVER(dir),
2626                                 _nfs4_proc_remove(dir, name),
2627                                 &exception);
2628         } while (exception.retry);
2629         return err;
2630 }
2631
2632 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2633 {
2634         struct nfs_server *server = NFS_SERVER(dir);
2635         struct nfs_removeargs *args = msg->rpc_argp;
2636         struct nfs_removeres *res = msg->rpc_resp;
2637
2638         args->bitmask = server->cache_consistency_bitmask;
2639         res->server = server;
2640         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2641 }
2642
2643 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2644 {
2645         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2646
2647         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2648         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2649                 return 0;
2650         update_changeattr(dir, &res->cinfo);
2651         nfs_post_op_update_inode(dir, res->dir_attr);
2652         return 1;
2653 }
2654
2655 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2656                 struct inode *new_dir, struct qstr *new_name)
2657 {
2658         struct nfs_server *server = NFS_SERVER(old_dir);
2659         struct nfs4_rename_arg arg = {
2660                 .old_dir = NFS_FH(old_dir),
2661                 .new_dir = NFS_FH(new_dir),
2662                 .old_name = old_name,
2663                 .new_name = new_name,
2664                 .bitmask = server->attr_bitmask,
2665         };
2666         struct nfs4_rename_res res = {
2667                 .server = server,
2668         };
2669         struct rpc_message msg = {
2670                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2671                 .rpc_argp = &arg,
2672                 .rpc_resp = &res,
2673         };
2674         int status = -ENOMEM;
2675
2676         res.old_fattr = nfs_alloc_fattr();
2677         res.new_fattr = nfs_alloc_fattr();
2678         if (res.old_fattr == NULL || res.new_fattr == NULL)
2679                 goto out;
2680
2681         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2682         if (!status) {
2683                 update_changeattr(old_dir, &res.old_cinfo);
2684                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2685                 update_changeattr(new_dir, &res.new_cinfo);
2686                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2687         }
2688 out:
2689         nfs_free_fattr(res.new_fattr);
2690         nfs_free_fattr(res.old_fattr);
2691         return status;
2692 }
2693
2694 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2695                 struct inode *new_dir, struct qstr *new_name)
2696 {
2697         struct nfs4_exception exception = { };
2698         int err;
2699         do {
2700                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2701                                 _nfs4_proc_rename(old_dir, old_name,
2702                                         new_dir, new_name),
2703                                 &exception);
2704         } while (exception.retry);
2705         return err;
2706 }
2707
2708 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2709 {
2710         struct nfs_server *server = NFS_SERVER(inode);
2711         struct nfs4_link_arg arg = {
2712                 .fh     = NFS_FH(inode),
2713                 .dir_fh = NFS_FH(dir),
2714                 .name   = name,
2715                 .bitmask = server->attr_bitmask,
2716         };
2717         struct nfs4_link_res res = {
2718                 .server = server,
2719         };
2720         struct rpc_message msg = {
2721                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2722                 .rpc_argp = &arg,
2723                 .rpc_resp = &res,
2724         };
2725         int status = -ENOMEM;
2726
2727         res.fattr = nfs_alloc_fattr();
2728         res.dir_attr = nfs_alloc_fattr();
2729         if (res.fattr == NULL || res.dir_attr == NULL)
2730                 goto out;
2731
2732         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2733         if (!status) {
2734                 update_changeattr(dir, &res.cinfo);
2735                 nfs_post_op_update_inode(dir, res.dir_attr);
2736                 nfs_post_op_update_inode(inode, res.fattr);
2737         }
2738 out:
2739         nfs_free_fattr(res.dir_attr);
2740         nfs_free_fattr(res.fattr);
2741         return status;
2742 }
2743
2744 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2745 {
2746         struct nfs4_exception exception = { };
2747         int err;
2748         do {
2749                 err = nfs4_handle_exception(NFS_SERVER(inode),
2750                                 _nfs4_proc_link(inode, dir, name),
2751                                 &exception);
2752         } while (exception.retry);
2753         return err;
2754 }
2755
2756 struct nfs4_createdata {
2757         struct rpc_message msg;
2758         struct nfs4_create_arg arg;
2759         struct nfs4_create_res res;
2760         struct nfs_fh fh;
2761         struct nfs_fattr fattr;
2762         struct nfs_fattr dir_fattr;
2763 };
2764
2765 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2766                 struct qstr *name, struct iattr *sattr, u32 ftype)
2767 {
2768         struct nfs4_createdata *data;
2769
2770         data = kzalloc(sizeof(*data), GFP_KERNEL);
2771         if (data != NULL) {
2772                 struct nfs_server *server = NFS_SERVER(dir);
2773
2774                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2775                 data->msg.rpc_argp = &data->arg;
2776                 data->msg.rpc_resp = &data->res;
2777                 data->arg.dir_fh = NFS_FH(dir);
2778                 data->arg.server = server;
2779                 data->arg.name = name;
2780                 data->arg.attrs = sattr;
2781                 data->arg.ftype = ftype;
2782                 data->arg.bitmask = server->attr_bitmask;
2783                 data->res.server = server;
2784                 data->res.fh = &data->fh;
2785                 data->res.fattr = &data->fattr;
2786                 data->res.dir_fattr = &data->dir_fattr;
2787                 nfs_fattr_init(data->res.fattr);
2788                 nfs_fattr_init(data->res.dir_fattr);
2789         }
2790         return data;
2791 }
2792
2793 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2794 {
2795         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2796                                     &data->arg, &data->res, 1);
2797         if (status == 0) {
2798                 update_changeattr(dir, &data->res.dir_cinfo);
2799                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2800                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2801         }
2802         return status;
2803 }
2804
2805 static void nfs4_free_createdata(struct nfs4_createdata *data)
2806 {
2807         kfree(data);
2808 }
2809
2810 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2811                 struct page *page, unsigned int len, struct iattr *sattr)
2812 {
2813         struct nfs4_createdata *data;
2814         int status = -ENAMETOOLONG;
2815
2816         if (len > NFS4_MAXPATHLEN)
2817                 goto out;
2818
2819         status = -ENOMEM;
2820         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2821         if (data == NULL)
2822                 goto out;
2823
2824         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2825         data->arg.u.symlink.pages = &page;
2826         data->arg.u.symlink.len = len;
2827
2828         status = nfs4_do_create(dir, dentry, data);
2829
2830         nfs4_free_createdata(data);
2831 out:
2832         return status;
2833 }
2834
2835 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2836                 struct page *page, unsigned int len, struct iattr *sattr)
2837 {
2838         struct nfs4_exception exception = { };
2839         int err;
2840         do {
2841                 err = nfs4_handle_exception(NFS_SERVER(dir),
2842                                 _nfs4_proc_symlink(dir, dentry, page,
2843                                                         len, sattr),
2844                                 &exception);
2845         } while (exception.retry);
2846         return err;
2847 }
2848
2849 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2850                 struct iattr *sattr)
2851 {
2852         struct nfs4_createdata *data;
2853         int status = -ENOMEM;
2854
2855         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2856         if (data == NULL)
2857                 goto out;
2858
2859         status = nfs4_do_create(dir, dentry, data);
2860
2861         nfs4_free_createdata(data);
2862 out:
2863         return status;
2864 }
2865
2866 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2867                 struct iattr *sattr)
2868 {
2869         struct nfs4_exception exception = { };
2870         int err;
2871         do {
2872                 err = nfs4_handle_exception(NFS_SERVER(dir),
2873                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2874                                 &exception);
2875         } while (exception.retry);
2876         return err;
2877 }
2878
2879 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2880                   u64 cookie, struct page *page, unsigned int count, int plus)
2881 {
2882         struct inode            *dir = dentry->d_inode;
2883         struct nfs4_readdir_arg args = {
2884                 .fh = NFS_FH(dir),
2885                 .pages = &page,
2886                 .pgbase = 0,
2887                 .count = count,
2888                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2889         };
2890         struct nfs4_readdir_res res;
2891         struct rpc_message msg = {
2892                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2893                 .rpc_argp = &args,
2894                 .rpc_resp = &res,
2895                 .rpc_cred = cred,
2896         };
2897         int                     status;
2898
2899         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2900                         dentry->d_parent->d_name.name,
2901                         dentry->d_name.name,
2902                         (unsigned long long)cookie);
2903         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2904         res.pgbase = args.pgbase;
2905         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2906         if (status == 0)
2907                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2908
2909         nfs_invalidate_atime(dir);
2910
2911         dprintk("%s: returns %d\n", __func__, status);
2912         return status;
2913 }
2914
2915 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2916                   u64 cookie, struct page *page, unsigned int count, int plus)
2917 {
2918         struct nfs4_exception exception = { };
2919         int err;
2920         do {
2921                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2922                                 _nfs4_proc_readdir(dentry, cred, cookie,
2923                                         page, count, plus),
2924                                 &exception);
2925         } while (exception.retry);
2926         return err;
2927 }
2928
2929 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2930                 struct iattr *sattr, dev_t rdev)
2931 {
2932         struct nfs4_createdata *data;
2933         int mode = sattr->ia_mode;
2934         int status = -ENOMEM;
2935
2936         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2937         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2938
2939         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2940         if (data == NULL)
2941                 goto out;
2942
2943         if (S_ISFIFO(mode))
2944                 data->arg.ftype = NF4FIFO;
2945         else if (S_ISBLK(mode)) {
2946                 data->arg.ftype = NF4BLK;
2947                 data->arg.u.device.specdata1 = MAJOR(rdev);
2948                 data->arg.u.device.specdata2 = MINOR(rdev);
2949         }
2950         else if (S_ISCHR(mode)) {
2951                 data->arg.ftype = NF4CHR;
2952                 data->arg.u.device.specdata1 = MAJOR(rdev);
2953                 data->arg.u.device.specdata2 = MINOR(rdev);
2954         }
2955
2956         status = nfs4_do_create(dir, dentry, data);
2957
2958         nfs4_free_createdata(data);
2959 out:
2960         return status;
2961 }
2962
2963 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2964                 struct iattr *sattr, dev_t rdev)
2965 {
2966         struct nfs4_exception exception = { };
2967         int err;
2968         do {
2969                 err = nfs4_handle_exception(NFS_SERVER(dir),
2970                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2971                                 &exception);
2972         } while (exception.retry);
2973         return err;
2974 }
2975
2976 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2977                  struct nfs_fsstat *fsstat)
2978 {
2979         struct nfs4_statfs_arg args = {
2980                 .fh = fhandle,
2981                 .bitmask = server->attr_bitmask,
2982         };
2983         struct nfs4_statfs_res res = {
2984                 .fsstat = fsstat,
2985         };
2986         struct rpc_message msg = {
2987                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2988                 .rpc_argp = &args,
2989                 .rpc_resp = &res,
2990         };
2991
2992         nfs_fattr_init(fsstat->fattr);
2993         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2994 }
2995
2996 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2997 {
2998         struct nfs4_exception exception = { };
2999         int err;
3000         do {
3001                 err = nfs4_handle_exception(server,
3002                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3003                                 &exception);
3004         } while (exception.retry);
3005         return err;
3006 }
3007
3008 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3009                 struct nfs_fsinfo *fsinfo)
3010 {
3011         struct nfs4_fsinfo_arg args = {
3012                 .fh = fhandle,
3013                 .bitmask = server->attr_bitmask,
3014         };
3015         struct nfs4_fsinfo_res res = {
3016                 .fsinfo = fsinfo,
3017         };
3018         struct rpc_message msg = {
3019                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3020                 .rpc_argp = &args,
3021                 .rpc_resp = &res,
3022         };
3023
3024         return nfs4_call_sync(server, &msg, &args, &res, 0);
3025 }
3026
3027 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3028 {
3029         struct nfs4_exception exception = { };
3030         int err;
3031
3032         do {
3033                 err = nfs4_handle_exception(server,
3034                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3035                                 &exception);
3036         } while (exception.retry);
3037         return err;
3038 }
3039
3040 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3041 {
3042         nfs_fattr_init(fsinfo->fattr);
3043         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3044 }
3045
3046 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3047                 struct nfs_pathconf *pathconf)
3048 {
3049         struct nfs4_pathconf_arg args = {
3050                 .fh = fhandle,
3051                 .bitmask = server->attr_bitmask,
3052         };
3053         struct nfs4_pathconf_res res = {
3054                 .pathconf = pathconf,
3055         };
3056         struct rpc_message msg = {
3057                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3058                 .rpc_argp = &args,
3059                 .rpc_resp = &res,
3060         };
3061
3062         /* None of the pathconf attributes are mandatory to implement */
3063         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3064                 memset(pathconf, 0, sizeof(*pathconf));
3065                 return 0;
3066         }
3067
3068         nfs_fattr_init(pathconf->fattr);
3069         return nfs4_call_sync(server, &msg, &args, &res, 0);
3070 }
3071
3072 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3073                 struct nfs_pathconf *pathconf)
3074 {
3075         struct nfs4_exception exception = { };
3076         int err;
3077
3078         do {
3079                 err = nfs4_handle_exception(server,
3080                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3081                                 &exception);
3082         } while (exception.retry);
3083         return err;
3084 }
3085
3086 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3087 {
3088         struct nfs_server *server = NFS_SERVER(data->inode);
3089
3090         dprintk("--> %s\n", __func__);
3091
3092         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
3093
3094         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3095                 nfs_restart_rpc(task, server->nfs_client);
3096                 return -EAGAIN;
3097         }
3098
3099         nfs_invalidate_atime(data->inode);
3100         if (task->tk_status > 0)
3101                 renew_lease(server, data->timestamp);
3102         return 0;
3103 }
3104
3105 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3106 {
3107         data->timestamp   = jiffies;
3108         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3109 }
3110
3111 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3112 {
3113         struct inode *inode = data->inode;
3114
3115         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3116                            task->tk_status);
3117
3118         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3119                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3120                 return -EAGAIN;
3121         }
3122         if (task->tk_status >= 0) {
3123                 renew_lease(NFS_SERVER(inode), data->timestamp);
3124                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3125         }
3126         return 0;
3127 }
3128
3129 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3130 {
3131         struct nfs_server *server = NFS_SERVER(data->inode);
3132
3133         data->args.bitmask = server->cache_consistency_bitmask;
3134         data->res.server = server;
3135         data->timestamp   = jiffies;
3136
3137         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3138 }
3139
3140 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3141 {
3142         struct inode *inode = data->inode;
3143
3144         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3145                            task->tk_status);
3146         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3147                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3148                 return -EAGAIN;
3149         }
3150         nfs_refresh_inode(inode, data->res.fattr);
3151         return 0;
3152 }
3153
3154 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3155 {
3156         struct nfs_server *server = NFS_SERVER(data->inode);
3157
3158         data->args.bitmask = server->cache_consistency_bitmask;
3159         data->res.server = server;
3160         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3161 }
3162
3163 struct nfs4_renewdata {
3164         struct nfs_client       *client;
3165         unsigned long           timestamp;
3166 };
3167
3168 /*
3169  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3170  * standalone procedure for queueing an asynchronous RENEW.
3171  */
3172 static void nfs4_renew_release(void *calldata)
3173 {
3174         struct nfs4_renewdata *data = calldata;
3175         struct nfs_client *clp = data->client;
3176
3177         if (atomic_read(&clp->cl_count) > 1)
3178                 nfs4_schedule_state_renewal(clp);
3179         nfs_put_client(clp);
3180         kfree(data);
3181 }
3182
3183 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3184 {
3185         struct nfs4_renewdata *data = calldata;
3186         struct nfs_client *clp = data->client;
3187         unsigned long timestamp = data->timestamp;
3188
3189         if (task->tk_status < 0) {
3190                 /* Unless we're shutting down, schedule state recovery! */
3191                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3192                         nfs4_schedule_state_recovery(clp);
3193                 return;
3194         }
3195         spin_lock(&clp->cl_lock);
3196         if (time_before(clp->cl_last_renewal,timestamp))
3197                 clp->cl_last_renewal = timestamp;
3198         spin_unlock(&clp->cl_lock);
3199 }
3200
3201 static const struct rpc_call_ops nfs4_renew_ops = {
3202         .rpc_call_done = nfs4_renew_done,
3203         .rpc_release = nfs4_renew_release,
3204 };
3205
3206 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3207 {
3208         struct rpc_message msg = {
3209                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3210                 .rpc_argp       = clp,
3211                 .rpc_cred       = cred,
3212         };
3213         struct nfs4_renewdata *data;
3214
3215         if (!atomic_inc_not_zero(&clp->cl_count))
3216                 return -EIO;
3217         data = kmalloc(sizeof(*data), GFP_KERNEL);
3218         if (data == NULL)
3219                 return -ENOMEM;
3220         data->client = clp;
3221         data->timestamp = jiffies;
3222         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3223                         &nfs4_renew_ops, data);
3224 }
3225
3226 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3227 {
3228         struct rpc_message msg = {
3229                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3230                 .rpc_argp       = clp,
3231                 .rpc_cred       = cred,
3232         };
3233         unsigned long now = jiffies;
3234         int status;
3235
3236         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3237         if (status < 0)
3238                 return status;
3239         spin_lock(&clp->cl_lock);
3240         if (time_before(clp->cl_last_renewal,now))
3241                 clp->cl_last_renewal = now;
3242         spin_unlock(&clp->cl_lock);
3243         return 0;
3244 }
3245
3246 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3247 {
3248         return (server->caps & NFS_CAP_ACLS)
3249                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3250                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3251 }
3252
3253 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3254  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3255  * the stack.
3256  */
3257 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3258
3259 static void buf_to_pages(const void *buf, size_t buflen,
3260                 struct page **pages, unsigned int *pgbase)
3261 {
3262         const void *p = buf;
3263
3264         *pgbase = offset_in_page(buf);
3265         p -= *pgbase;
3266         while (p < buf + buflen) {
3267                 *(pages++) = virt_to_page(p);
3268                 p += PAGE_CACHE_SIZE;
3269         }
3270 }
3271
3272 struct nfs4_cached_acl {
3273         int cached;
3274         size_t len;
3275         char data[0];
3276 };
3277
3278 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3279 {
3280         struct nfs_inode *nfsi = NFS_I(inode);
3281
3282         spin_lock(&inode->i_lock);
3283         kfree(nfsi->nfs4_acl);
3284         nfsi->nfs4_acl = acl;
3285         spin_unlock(&inode->i_lock);
3286 }
3287
3288 static void nfs4_zap_acl_attr(struct inode *inode)
3289 {
3290         nfs4_set_cached_acl(inode, NULL);
3291 }
3292
3293 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3294 {
3295         struct nfs_inode *nfsi = NFS_I(inode);
3296         struct nfs4_cached_acl *acl;
3297         int ret = -ENOENT;
3298
3299         spin_lock(&inode->i_lock);
3300         acl = nfsi->nfs4_acl;
3301         if (acl == NULL)
3302                 goto out;
3303         if (buf == NULL) /* user is just asking for length */
3304                 goto out_len;
3305         if (acl->cached == 0)
3306                 goto out;
3307         ret = -ERANGE; /* see getxattr(2) man page */
3308         if (acl->len > buflen)
3309                 goto out;
3310         memcpy(buf, acl->data, acl->len);
3311 out_len:
3312         ret = acl->len;
3313 out:
3314         spin_unlock(&inode->i_lock);
3315         return ret;
3316 }
3317
3318 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3319 {
3320         struct nfs4_cached_acl *acl;
3321
3322         if (buf && acl_len <= PAGE_SIZE) {
3323                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3324                 if (acl == NULL)
3325                         goto out;
3326                 acl->cached = 1;
3327                 memcpy(acl->data, buf, acl_len);
3328         } else {
3329                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3330                 if (acl == NULL)
3331                         goto out;
3332                 acl->cached = 0;
3333         }
3334         acl->len = acl_len;
3335 out:
3336         nfs4_set_cached_acl(inode, acl);
3337 }
3338
3339 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3340 {
3341         struct page *pages[NFS4ACL_MAXPAGES];
3342         struct nfs_getaclargs args = {
3343                 .fh = NFS_FH(inode),
3344                 .acl_pages = pages,
3345                 .acl_len = buflen,
3346         };
3347         struct nfs_getaclres res = {
3348                 .acl_len = buflen,
3349         };
3350         void *resp_buf;
3351         struct rpc_message msg = {
3352                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3353                 .rpc_argp = &args,
3354                 .rpc_resp = &res,
3355         };
3356         struct page *localpage = NULL;
3357         int ret;
3358
3359         if (buflen < PAGE_SIZE) {
3360                 /* As long as we're doing a round trip to the server anyway,
3361                  * let's be prepared for a page of acl data. */
3362                 localpage = alloc_page(GFP_KERNEL);
3363                 resp_buf = page_address(localpage);
3364                 if (localpage == NULL)
3365                         return -ENOMEM;
3366                 args.acl_pages[0] = localpage;
3367                 args.acl_pgbase = 0;
3368                 args.acl_len = PAGE_SIZE;
3369         } else {
3370                 resp_buf = buf;
3371                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3372         }
3373         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3374         if (ret)
3375                 goto out_free;
3376         if (res.acl_len > args.acl_len)
3377                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3378         else
3379                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3380         if (buf) {
3381                 ret = -ERANGE;
3382                 if (res.acl_len > buflen)
3383                         goto out_free;
3384                 if (localpage)
3385                         memcpy(buf, resp_buf, res.acl_len);
3386         }
3387         ret = res.acl_len;
3388 out_free:
3389         if (localpage)
3390                 __free_page(localpage);
3391         return ret;
3392 }
3393
3394 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3395 {
3396         struct nfs4_exception exception = { };
3397         ssize_t ret;
3398         do {
3399                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3400                 if (ret >= 0)
3401                         break;
3402                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3403         } while (exception.retry);
3404         return ret;
3405 }
3406
3407 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3408 {
3409         struct nfs_server *server = NFS_SERVER(inode);
3410         int ret;
3411
3412         if (!nfs4_server_supports_acls(server))
3413                 return -EOPNOTSUPP;
3414         ret = nfs_revalidate_inode(server, inode);
3415         if (ret < 0)
3416                 return ret;
3417         ret = nfs4_read_cached_acl(inode, buf, buflen);
3418         if (ret != -ENOENT)
3419                 return ret;
3420         return nfs4_get_acl_uncached(inode, buf, buflen);
3421 }
3422
3423 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3424 {
3425         struct nfs_server *server = NFS_SERVER(inode);
3426         struct page *pages[NFS4ACL_MAXPAGES];
3427         struct nfs_setaclargs arg = {
3428                 .fh             = NFS_FH(inode),
3429                 .acl_pages      = pages,
3430                 .acl_len        = buflen,
3431         };
3432         struct nfs_setaclres res;
3433         struct rpc_message msg = {
3434                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3435                 .rpc_argp       = &arg,
3436                 .rpc_resp       = &res,
3437         };
3438         int ret;
3439
3440         if (!nfs4_server_supports_acls(server))
3441                 return -EOPNOTSUPP;
3442         nfs_inode_return_delegation(inode);
3443         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3444         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3445         nfs_access_zap_cache(inode);
3446         nfs_zap_acl_cache(inode);
3447         return ret;
3448 }
3449
3450 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3451 {
3452         struct nfs4_exception exception = { };
3453         int err;
3454         do {
3455                 err = nfs4_handle_exception(NFS_SERVER(inode),
3456                                 __nfs4_proc_set_acl(inode, buf, buflen),
3457                                 &exception);
3458         } while (exception.retry);
3459         return err;
3460 }
3461
3462 static int
3463 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3464 {
3465         struct nfs_client *clp = server->nfs_client;
3466
3467         if (task->tk_status >= 0)
3468                 return 0;
3469         switch(task->tk_status) {
3470                 case -NFS4ERR_ADMIN_REVOKED:
3471                 case -NFS4ERR_BAD_STATEID:
3472                 case -NFS4ERR_OPENMODE:
3473                         if (state == NULL)
3474                                 break;
3475                         nfs4_state_mark_reclaim_nograce(clp, state);
3476                         goto do_state_recovery;
3477                 case -NFS4ERR_STALE_STATEID:
3478                         if (state == NULL)
3479                                 break;
3480                         nfs4_state_mark_reclaim_reboot(clp, state);
3481                 case -NFS4ERR_STALE_CLIENTID:
3482                 case -NFS4ERR_EXPIRED:
3483                         goto do_state_recovery;
3484 #if defined(CONFIG_NFS_V4_1)
3485                 case -NFS4ERR_BADSESSION:
3486                 case -NFS4ERR_BADSLOT:
3487                 case -NFS4ERR_BAD_HIGH_SLOT:
3488                 case -NFS4ERR_DEADSESSION:
3489                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3490                 case -NFS4ERR_SEQ_FALSE_RETRY:
3491                 case -NFS4ERR_SEQ_MISORDERED:
3492                         dprintk("%s ERROR %d, Reset session\n", __func__,
3493                                 task->tk_status);
3494                         nfs4_schedule_state_recovery(clp);
3495                         task->tk_status = 0;
3496                         return -EAGAIN;
3497 #endif /* CONFIG_NFS_V4_1 */
3498                 case -NFS4ERR_DELAY:
3499                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3500                 case -NFS4ERR_GRACE:
3501                 case -EKEYEXPIRED:
3502                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3503                         task->tk_status = 0;
3504                         return -EAGAIN;
3505                 case -NFS4ERR_OLD_STATEID:
3506                         task->tk_status = 0;
3507                         return -EAGAIN;
3508         }
3509         task->tk_status = nfs4_map_errors(task->tk_status);
3510         return 0;
3511 do_state_recovery:
3512         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3513         nfs4_schedule_state_recovery(clp);
3514         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3515                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3516         task->tk_status = 0;
3517         return -EAGAIN;
3518 }
3519
3520 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3521                 unsigned short port, struct rpc_cred *cred,
3522                 struct nfs4_setclientid_res *res)
3523 {
3524         nfs4_verifier sc_verifier;
3525         struct nfs4_setclientid setclientid = {
3526                 .sc_verifier = &sc_verifier,
3527                 .sc_prog = program,
3528         };
3529         struct rpc_message msg = {
3530                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3531                 .rpc_argp = &setclientid,
3532                 .rpc_resp = res,
3533                 .rpc_cred = cred,
3534         };
3535         __be32 *p;
3536         int loop = 0;
3537         int status;
3538
3539         p = (__be32*)sc_verifier.data;
3540         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3541         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3542
3543         for(;;) {
3544                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3545                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3546                                 clp->cl_ipaddr,
3547                                 rpc_peeraddr2str(clp->cl_rpcclient,
3548                                                         RPC_DISPLAY_ADDR),
3549                                 rpc_peeraddr2str(clp->cl_rpcclient,
3550                                                         RPC_DISPLAY_PROTO),
3551                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3552                                 clp->cl_id_uniquifier);
3553                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3554                                 sizeof(setclientid.sc_netid),
3555                                 rpc_peeraddr2str(clp->cl_rpcclient,
3556                                                         RPC_DISPLAY_NETID));
3557                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3558                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3559                                 clp->cl_ipaddr, port >> 8, port & 255);
3560
3561                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3562                 if (status != -NFS4ERR_CLID_INUSE)
3563                         break;
3564                 if (signalled())
3565                         break;
3566                 if (loop++ & 1)
3567                         ssleep(clp->cl_lease_time + 1);
3568                 else
3569                         if (++clp->cl_id_uniquifier == 0)
3570                                 break;
3571         }
3572         return status;
3573 }
3574
3575 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3576                 struct nfs4_setclientid_res *arg,
3577                 struct rpc_cred *cred)
3578 {
3579         struct nfs_fsinfo fsinfo;
3580         struct rpc_message msg = {
3581                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3582                 .rpc_argp = arg,
3583                 .rpc_resp = &fsinfo,
3584                 .rpc_cred = cred,
3585         };
3586         unsigned long now;
3587         int status;
3588
3589         now = jiffies;
3590         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3591         if (status == 0) {
3592                 spin_lock(&clp->cl_lock);
3593                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3594                 clp->cl_last_renewal = now;
3595                 spin_unlock(&clp->cl_lock);
3596         }
3597         return status;
3598 }
3599
3600 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3601                 struct nfs4_setclientid_res *arg,
3602                 struct rpc_cred *cred)
3603 {
3604         long timeout = 0;
3605         int err;
3606         do {
3607                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3608                 switch (err) {
3609                         case 0:
3610                                 return err;
3611                         case -NFS4ERR_RESOURCE:
3612                                 /* The IBM lawyers misread another document! */
3613                         case -NFS4ERR_DELAY:
3614                         case -EKEYEXPIRED:
3615                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3616                 }
3617         } while (err == 0);
3618         return err;
3619 }
3620
3621 struct nfs4_delegreturndata {
3622         struct nfs4_delegreturnargs args;
3623         struct nfs4_delegreturnres res;
3624         struct nfs_fh fh;
3625         nfs4_stateid stateid;
3626         unsigned long timestamp;
3627         struct nfs_fattr fattr;
3628         int rpc_status;
3629 };
3630
3631 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3632 {
3633         struct nfs4_delegreturndata *data = calldata;
3634
3635         nfs4_sequence_done(data->res.server, &data->res.seq_res,
3636                         task->tk_status);
3637
3638         switch (task->tk_status) {
3639         case -NFS4ERR_STALE_STATEID:
3640         case -NFS4ERR_EXPIRED:
3641         case 0:
3642                 renew_lease(data->res.server, data->timestamp);
3643                 break;
3644         default:
3645                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3646                                 -EAGAIN) {
3647                         nfs_restart_rpc(task, data->res.server->nfs_client);
3648                         return;
3649                 }
3650         }
3651         data->rpc_status = task->tk_status;
3652 }
3653
3654 static void nfs4_delegreturn_release(void *calldata)
3655 {
3656         kfree(calldata);
3657 }
3658
3659 #if defined(CONFIG_NFS_V4_1)
3660 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3661 {
3662         struct nfs4_delegreturndata *d_data;
3663
3664         d_data = (struct nfs4_delegreturndata *)data;
3665
3666         if (nfs4_setup_sequence(d_data->res.server,
3667                                 &d_data->args.seq_args,
3668                                 &d_data->res.seq_res, 1, task))
3669                 return;
3670         rpc_call_start(task);
3671 }
3672 #endif /* CONFIG_NFS_V4_1 */
3673
3674 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3675 #if defined(CONFIG_NFS_V4_1)
3676         .rpc_call_prepare = nfs4_delegreturn_prepare,
3677 #endif /* CONFIG_NFS_V4_1 */
3678         .rpc_call_done = nfs4_delegreturn_done,
3679         .rpc_release = nfs4_delegreturn_release,
3680 };
3681
3682 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3683 {
3684         struct nfs4_delegreturndata *data;
3685         struct nfs_server *server = NFS_SERVER(inode);
3686         struct rpc_task *task;
3687         struct rpc_message msg = {
3688                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3689                 .rpc_cred = cred,
3690         };
3691         struct rpc_task_setup task_setup_data = {
3692                 .rpc_client = server->client,
3693                 .rpc_message = &msg,
3694                 .callback_ops = &nfs4_delegreturn_ops,
3695                 .flags = RPC_TASK_ASYNC,
3696         };
3697         int status = 0;
3698
3699         data = kzalloc(sizeof(*data), GFP_NOFS);
3700         if (data == NULL)
3701                 return -ENOMEM;
3702         data->args.fhandle = &data->fh;
3703         data->args.stateid = &data->stateid;
3704         data->args.bitmask = server->attr_bitmask;
3705         nfs_copy_fh(&data->fh, NFS_FH(inode));
3706         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3707         data->res.fattr = &data->fattr;
3708         data->res.server = server;
3709         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3710         nfs_fattr_init(data->res.fattr);
3711         data->timestamp = jiffies;
3712         data->rpc_status = 0;
3713
3714         task_setup_data.callback_data = data;
3715         msg.rpc_argp = &data->args,
3716         msg.rpc_resp = &data->res,
3717         task = rpc_run_task(&task_setup_data);
3718         if (IS_ERR(task))
3719                 return PTR_ERR(task);
3720         if (!issync)
3721                 goto out;
3722         status = nfs4_wait_for_completion_rpc_task(task);
3723         if (status != 0)
3724                 goto out;
3725         status = data->rpc_status;
3726         if (status != 0)
3727                 goto out;
3728         nfs_refresh_inode(inode, &data->fattr);
3729 out:
3730         rpc_put_task(task);
3731         return status;
3732 }
3733
3734 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3735 {
3736         struct nfs_server *server = NFS_SERVER(inode);
3737         struct nfs4_exception exception = { };
3738         int err;
3739         do {
3740                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3741                 switch (err) {
3742                         case -NFS4ERR_STALE_STATEID:
3743                         case -NFS4ERR_EXPIRED:
3744                         case 0:
3745                                 return 0;
3746                 }
3747                 err = nfs4_handle_exception(server, err, &exception);
3748         } while (exception.retry);
3749         return err;
3750 }
3751
3752 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3753 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3754
3755 /*
3756  * sleep, with exponential backoff, and retry the LOCK operation.
3757  */
3758 static unsigned long
3759 nfs4_set_lock_task_retry(unsigned long timeout)
3760 {
3761         schedule_timeout_killable(timeout);
3762         timeout <<= 1;
3763         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3764                 return NFS4_LOCK_MAXTIMEOUT;
3765         return timeout;
3766 }
3767
3768 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3769 {
3770         struct inode *inode = state->inode;
3771         struct nfs_server *server = NFS_SERVER(inode);
3772         struct nfs_client *clp = server->nfs_client;
3773         struct nfs_lockt_args arg = {
3774                 .fh = NFS_FH(inode),
3775                 .fl = request,
3776         };
3777         struct nfs_lockt_res res = {
3778                 .denied = request,
3779         };
3780         struct rpc_message msg = {
3781                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3782                 .rpc_argp       = &arg,
3783                 .rpc_resp       = &res,
3784                 .rpc_cred       = state->owner->so_cred,
3785         };
3786         struct nfs4_lock_state *lsp;
3787         int status;
3788
3789         arg.lock_owner.clientid = clp->cl_clientid;
3790         status = nfs4_set_lock_state(state, request);
3791         if (status != 0)
3792                 goto out;
3793         lsp = request->fl_u.nfs4_fl.owner;
3794         arg.lock_owner.id = lsp->ls_id.id;
3795         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3796         switch (status) {
3797                 case 0:
3798                         request->fl_type = F_UNLCK;
3799                         break;
3800                 case -NFS4ERR_DENIED:
3801                         status = 0;
3802         }
3803         request->fl_ops->fl_release_private(request);
3804 out:
3805         return status;
3806 }
3807
3808 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3809 {
3810         struct nfs4_exception exception = { };
3811         int err;
3812
3813         do {
3814                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3815                                 _nfs4_proc_getlk(state, cmd, request),
3816                                 &exception);
3817         } while (exception.retry);
3818         return err;
3819 }
3820
3821 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3822 {
3823         int res = 0;
3824         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3825                 case FL_POSIX:
3826                         res = posix_lock_file_wait(file, fl);
3827                         break;
3828                 case FL_FLOCK:
3829                         res = flock_lock_file_wait(file, fl);
3830                         break;
3831                 default:
3832                         BUG();
3833         }
3834         return res;
3835 }
3836
3837 struct nfs4_unlockdata {
3838         struct nfs_locku_args arg;
3839         struct nfs_locku_res res;
3840         struct nfs4_lock_state *lsp;
3841         struct nfs_open_context *ctx;
3842         struct file_lock fl;
3843         const struct nfs_server *server;
3844         unsigned long timestamp;
3845 };
3846
3847 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3848                 struct nfs_open_context *ctx,
3849                 struct nfs4_lock_state *lsp,
3850                 struct nfs_seqid *seqid)
3851 {
3852         struct nfs4_unlockdata *p;
3853         struct inode *inode = lsp->ls_state->inode;
3854
3855         p = kzalloc(sizeof(*p), GFP_NOFS);
3856         if (p == NULL)
3857                 return NULL;
3858         p->arg.fh = NFS_FH(inode);
3859         p->arg.fl = &p->fl;
3860         p->arg.seqid = seqid;
3861         p->res.seqid = seqid;
3862         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3863         p->arg.stateid = &lsp->ls_stateid;
3864         p->lsp = lsp;
3865         atomic_inc(&lsp->ls_count);
3866         /* Ensure we don't close file until we're done freeing locks! */
3867         p->ctx = get_nfs_open_context(ctx);
3868         memcpy(&p->fl, fl, sizeof(p->fl));
3869         p->server = NFS_SERVER(inode);
3870         return p;
3871 }
3872
3873 static void nfs4_locku_release_calldata(void *data)
3874 {
3875         struct nfs4_unlockdata *calldata = data;
3876         nfs_free_seqid(calldata->arg.seqid);
3877         nfs4_put_lock_state(calldata->lsp);
3878         put_nfs_open_context(calldata->ctx);
3879         kfree(calldata);
3880 }
3881
3882 static void nfs4_locku_done(struct rpc_task *task, void *data)
3883 {
3884         struct nfs4_unlockdata *calldata = data;
3885
3886         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3887                            task->tk_status);
3888         if (RPC_ASSASSINATED(task))
3889                 return;
3890         switch (task->tk_status) {
3891                 case 0:
3892                         memcpy(calldata->lsp->ls_stateid.data,
3893                                         calldata->res.stateid.data,
3894                                         sizeof(calldata->lsp->ls_stateid.data));
3895                         renew_lease(calldata->server, calldata->timestamp);
3896                         break;
3897                 case -NFS4ERR_BAD_STATEID:
3898                 case -NFS4ERR_OLD_STATEID:
3899                 case -NFS4ERR_STALE_STATEID:
3900                 case -NFS4ERR_EXPIRED:
3901                         break;
3902                 default:
3903                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3904                                 nfs_restart_rpc(task,
3905                                                  calldata->server->nfs_client);
3906         }
3907 }
3908
3909 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3910 {
3911         struct nfs4_unlockdata *calldata = data;
3912
3913         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3914                 return;
3915         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3916                 /* Note: exit _without_ running nfs4_locku_done */
3917                 task->tk_action = NULL;
3918                 return;
3919         }
3920         calldata->timestamp = jiffies;
3921         if (nfs4_setup_sequence(calldata->server,
3922                                 &calldata->arg.seq_args,
3923                                 &calldata->res.seq_res, 1, task))
3924                 return;
3925         rpc_call_start(task);
3926 }
3927
3928 static const struct rpc_call_ops nfs4_locku_ops = {
3929         .rpc_call_prepare = nfs4_locku_prepare,
3930         .rpc_call_done = nfs4_locku_done,
3931         .rpc_release = nfs4_locku_release_calldata,
3932 };
3933
3934 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3935                 struct nfs_open_context *ctx,
3936                 struct nfs4_lock_state *lsp,
3937                 struct nfs_seqid *seqid)
3938 {
3939         struct nfs4_unlockdata *data;
3940         struct rpc_message msg = {
3941                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3942                 .rpc_cred = ctx->cred,
3943         };
3944         struct rpc_task_setup task_setup_data = {
3945                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3946                 .rpc_message = &msg,
3947                 .callback_ops = &nfs4_locku_ops,
3948                 .workqueue = nfsiod_workqueue,
3949                 .flags = RPC_TASK_ASYNC,
3950         };
3951
3952         /* Ensure this is an unlock - when canceling a lock, the
3953          * canceled lock is passed in, and it won't be an unlock.
3954          */
3955         fl->fl_type = F_UNLCK;
3956
3957         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3958         if (data == NULL) {
3959                 nfs_free_seqid(seqid);
3960                 return ERR_PTR(-ENOMEM);
3961         }
3962
3963         msg.rpc_argp = &data->arg,
3964         msg.rpc_resp = &data->res,
3965         task_setup_data.callback_data = data;
3966         return rpc_run_task(&task_setup_data);
3967 }
3968
3969 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3970 {
3971         struct nfs_inode *nfsi = NFS_I(state->inode);
3972         struct nfs_seqid *seqid;
3973         struct nfs4_lock_state *lsp;
3974         struct rpc_task *task;
3975         int status = 0;
3976         unsigned char fl_flags = request->fl_flags;
3977
3978         status = nfs4_set_lock_state(state, request);
3979         /* Unlock _before_ we do the RPC call */
3980         request->fl_flags |= FL_EXISTS;
3981         down_read(&nfsi->rwsem);
3982         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3983                 up_read(&nfsi->rwsem);
3984                 goto out;
3985         }
3986         up_read(&nfsi->rwsem);
3987         if (status != 0)
3988                 goto out;
3989         /* Is this a delegated lock? */
3990         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3991                 goto out;
3992         lsp = request->fl_u.nfs4_fl.owner;
3993         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
3994         status = -ENOMEM;
3995         if (seqid == NULL)
3996                 goto out;
3997         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3998         status = PTR_ERR(task);
3999         if (IS_ERR(task))
4000                 goto out;
4001         status = nfs4_wait_for_completion_rpc_task(task);
4002         rpc_put_task(task);
4003 out:
4004         request->fl_flags = fl_flags;
4005         return status;
4006 }
4007
4008 struct nfs4_lockdata {
4009         struct nfs_lock_args arg;
4010         struct nfs_lock_res res;
4011         struct nfs4_lock_state *lsp;
4012         struct nfs_open_context *ctx;
4013         struct file_lock fl;
4014         unsigned long timestamp;
4015         int rpc_status;
4016         int cancelled;
4017         struct nfs_server *server;
4018 };
4019
4020 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4021                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4022                 gfp_t gfp_mask)
4023 {
4024         struct nfs4_lockdata *p;
4025         struct inode *inode = lsp->ls_state->inode;
4026         struct nfs_server *server = NFS_SERVER(inode);
4027
4028         p = kzalloc(sizeof(*p), gfp_mask);
4029         if (p == NULL)
4030                 return NULL;
4031
4032         p->arg.fh = NFS_FH(inode);
4033         p->arg.fl = &p->fl;
4034         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4035         if (p->arg.open_seqid == NULL)
4036                 goto out_free;
4037         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4038         if (p->arg.lock_seqid == NULL)
4039                 goto out_free_seqid;
4040         p->arg.lock_stateid = &lsp->ls_stateid;
4041         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4042         p->arg.lock_owner.id = lsp->ls_id.id;
4043         p->res.lock_seqid = p->arg.lock_seqid;
4044         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4045         p->lsp = lsp;
4046         p->server = server;
4047         atomic_inc(&lsp->ls_count);
4048         p->ctx = get_nfs_open_context(ctx);
4049         memcpy(&p->fl, fl, sizeof(p->fl));
4050         return p;
4051 out_free_seqid:
4052         nfs_free_seqid(p->arg.open_seqid);
4053 out_free:
4054         kfree(p);
4055         return NULL;
4056 }
4057
4058 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4059 {
4060         struct nfs4_lockdata *data = calldata;
4061         struct nfs4_state *state = data->lsp->ls_state;
4062
4063         dprintk("%s: begin!\n", __func__);
4064         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4065                 return;
4066         /* Do we need to do an open_to_lock_owner? */
4067         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4068                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4069                         return;
4070                 data->arg.open_stateid = &state->stateid;
4071                 data->arg.new_lock_owner = 1;
4072                 data->res.open_seqid = data->arg.open_seqid;
4073         } else
4074                 data->arg.new_lock_owner = 0;
4075         data->timestamp = jiffies;
4076         if (nfs4_setup_sequence(data->server,
4077                                 &data->arg.seq_args,
4078                                 &data->res.seq_res, 1, task))
4079                 return;
4080         rpc_call_start(task);
4081         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4082 }
4083
4084 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4085 {
4086         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4087         nfs4_lock_prepare(task, calldata);
4088 }
4089
4090 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4091 {
4092         struct nfs4_lockdata *data = calldata;
4093
4094         dprintk("%s: begin!\n", __func__);
4095
4096         nfs4_sequence_done(data->server, &data->res.seq_res,
4097                         task->tk_status);
4098
4099         data->rpc_status = task->tk_status;
4100         if (RPC_ASSASSINATED(task))
4101                 goto out;
4102         if (data->arg.new_lock_owner != 0) {
4103                 if (data->rpc_status == 0)
4104                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4105                 else
4106                         goto out;
4107         }
4108         if (data->rpc_status == 0) {
4109                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4110                                         sizeof(data->lsp->ls_stateid.data));
4111                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4112                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4113         }
4114 out:
4115         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4116 }
4117
4118 static void nfs4_lock_release(void *calldata)
4119 {
4120         struct nfs4_lockdata *data = calldata;
4121
4122         dprintk("%s: begin!\n", __func__);
4123         nfs_free_seqid(data->arg.open_seqid);
4124         if (data->cancelled != 0) {
4125                 struct rpc_task *task;
4126                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4127                                 data->arg.lock_seqid);
4128                 if (!IS_ERR(task))
4129                         rpc_put_task(task);
4130                 dprintk("%s: cancelling lock!\n", __func__);
4131         } else
4132                 nfs_free_seqid(data->arg.lock_seqid);
4133         nfs4_put_lock_state(data->lsp);
4134         put_nfs_open_context(data->ctx);
4135         kfree(data);
4136         dprintk("%s: done!\n", __func__);
4137 }
4138
4139 static const struct rpc_call_ops nfs4_lock_ops = {
4140         .rpc_call_prepare = nfs4_lock_prepare,
4141         .rpc_call_done = nfs4_lock_done,
4142         .rpc_release = nfs4_lock_release,
4143 };
4144
4145 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4146         .rpc_call_prepare = nfs4_recover_lock_prepare,
4147         .rpc_call_done = nfs4_lock_done,
4148         .rpc_release = nfs4_lock_release,
4149 };
4150
4151 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4152 {
4153         struct nfs_client *clp = server->nfs_client;
4154         struct nfs4_state *state = lsp->ls_state;
4155
4156         switch (error) {
4157         case -NFS4ERR_ADMIN_REVOKED:
4158         case -NFS4ERR_BAD_STATEID:
4159         case -NFS4ERR_EXPIRED:
4160                 if (new_lock_owner != 0 ||
4161                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4162                         nfs4_state_mark_reclaim_nograce(clp, state);
4163                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4164                 break;
4165         case -NFS4ERR_STALE_STATEID:
4166                 if (new_lock_owner != 0 ||
4167                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4168                         nfs4_state_mark_reclaim_reboot(clp, state);
4169                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4170         };
4171 }
4172
4173 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4174 {
4175         struct nfs4_lockdata *data;
4176         struct rpc_task *task;
4177         struct rpc_message msg = {
4178                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4179                 .rpc_cred = state->owner->so_cred,
4180         };
4181         struct rpc_task_setup task_setup_data = {
4182                 .rpc_client = NFS_CLIENT(state->inode),
4183                 .rpc_message = &msg,
4184                 .callback_ops = &nfs4_lock_ops,
4185                 .workqueue = nfsiod_workqueue,
4186                 .flags = RPC_TASK_ASYNC,
4187         };
4188         int ret;
4189
4190         dprintk("%s: begin!\n", __func__);
4191         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4192                         fl->fl_u.nfs4_fl.owner,
4193                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4194         if (data == NULL)
4195                 return -ENOMEM;
4196         if (IS_SETLKW(cmd))
4197                 data->arg.block = 1;
4198         if (recovery_type > NFS_LOCK_NEW) {
4199                 if (recovery_type == NFS_LOCK_RECLAIM)
4200                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4201                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4202         }
4203         msg.rpc_argp = &data->arg,
4204         msg.rpc_resp = &data->res,
4205         task_setup_data.callback_data = data;
4206         task = rpc_run_task(&task_setup_data);
4207         if (IS_ERR(task))
4208                 return PTR_ERR(task);
4209         ret = nfs4_wait_for_completion_rpc_task(task);
4210         if (ret == 0) {
4211                 ret = data->rpc_status;
4212                 if (ret)
4213                         nfs4_handle_setlk_error(data->server, data->lsp,
4214                                         data->arg.new_lock_owner, ret);
4215         } else
4216                 data->cancelled = 1;
4217         rpc_put_task(task);
4218         dprintk("%s: done, ret = %d!\n", __func__, ret);
4219         return ret;
4220 }
4221
4222 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4223 {
4224         struct nfs_server *server = NFS_SERVER(state->inode);
4225         struct nfs4_exception exception = { };
4226         int err;
4227
4228         do {
4229                 /* Cache the lock if possible... */
4230                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4231                         return 0;
4232                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4233                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
4234                         break;
4235                 nfs4_handle_exception(server, err, &exception);
4236         } while (exception.retry);
4237         return err;
4238 }
4239
4240 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4241 {
4242         struct nfs_server *server = NFS_SERVER(state->inode);
4243         struct nfs4_exception exception = { };
4244         int err;
4245
4246         err = nfs4_set_lock_state(state, request);
4247         if (err != 0)
4248                 return err;
4249         do {
4250                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4251                         return 0;
4252                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4253                 switch (err) {
4254                 default:
4255                         goto out;
4256                 case -NFS4ERR_GRACE:
4257                 case -NFS4ERR_DELAY:
4258                 case -EKEYEXPIRED:
4259                         nfs4_handle_exception(server, err, &exception);
4260                         err = 0;
4261                 }
4262         } while (exception.retry);
4263 out:
4264         return err;
4265 }
4266
4267 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4268 {
4269         struct nfs_inode *nfsi = NFS_I(state->inode);
4270         unsigned char fl_flags = request->fl_flags;
4271         int status = -ENOLCK;
4272
4273         if ((fl_flags & FL_POSIX) &&
4274                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4275                 goto out;
4276         /* Is this a delegated open? */
4277         status = nfs4_set_lock_state(state, request);
4278         if (status != 0)
4279                 goto out;
4280         request->fl_flags |= FL_ACCESS;
4281         status = do_vfs_lock(request->fl_file, request);
4282         if (status < 0)
4283                 goto out;
4284         down_read(&nfsi->rwsem);
4285         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4286                 /* Yes: cache locks! */
4287                 /* ...but avoid races with delegation recall... */
4288                 request->fl_flags = fl_flags & ~FL_SLEEP;
4289                 status = do_vfs_lock(request->fl_file, request);
4290                 goto out_unlock;
4291         }
4292         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4293         if (status != 0)
4294                 goto out_unlock;
4295         /* Note: we always want to sleep here! */
4296         request->fl_flags = fl_flags | FL_SLEEP;
4297         if (do_vfs_lock(request->fl_file, request) < 0)
4298                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4299 out_unlock:
4300         up_read(&nfsi->rwsem);
4301 out:
4302         request->fl_flags = fl_flags;
4303         return status;
4304 }
4305
4306 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4307 {
4308         struct nfs4_exception exception = { };
4309         int err;
4310
4311         do {
4312                 err = _nfs4_proc_setlk(state, cmd, request);
4313                 if (err == -NFS4ERR_DENIED)
4314                         err = -EAGAIN;
4315                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4316                                 err, &exception);
4317         } while (exception.retry);
4318         return err;
4319 }
4320
4321 static int
4322 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4323 {
4324         struct nfs_open_context *ctx;
4325         struct nfs4_state *state;
4326         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4327         int status;
4328
4329         /* verify open state */
4330         ctx = nfs_file_open_context(filp);
4331         state = ctx->state;
4332
4333         if (request->fl_start < 0 || request->fl_end < 0)
4334                 return -EINVAL;
4335
4336         if (IS_GETLK(cmd)) {
4337                 if (state != NULL)
4338                         return nfs4_proc_getlk(state, F_GETLK, request);
4339                 return 0;
4340         }
4341
4342         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4343                 return -EINVAL;
4344
4345         if (request->fl_type == F_UNLCK) {
4346                 if (state != NULL)
4347                         return nfs4_proc_unlck(state, cmd, request);
4348                 return 0;
4349         }
4350
4351         if (state == NULL)
4352                 return -ENOLCK;
4353         do {
4354                 status = nfs4_proc_setlk(state, cmd, request);
4355                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4356                         break;
4357                 timeout = nfs4_set_lock_task_retry(timeout);
4358                 status = -ERESTARTSYS;
4359                 if (signalled())
4360                         break;
4361         } while(status < 0);
4362         return status;
4363 }
4364
4365 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4366 {
4367         struct nfs_server *server = NFS_SERVER(state->inode);
4368         struct nfs4_exception exception = { };
4369         int err;
4370
4371         err = nfs4_set_lock_state(state, fl);
4372         if (err != 0)
4373                 goto out;
4374         do {
4375                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4376                 switch (err) {
4377                         default:
4378                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4379                                                 __func__, err);
4380                         case 0:
4381                         case -ESTALE:
4382                                 goto out;
4383                         case -NFS4ERR_EXPIRED:
4384                         case -NFS4ERR_STALE_CLIENTID:
4385                         case -NFS4ERR_STALE_STATEID:
4386                         case -NFS4ERR_BADSESSION:
4387                         case -NFS4ERR_BADSLOT:
4388                         case -NFS4ERR_BAD_HIGH_SLOT:
4389                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4390                         case -NFS4ERR_DEADSESSION:
4391                                 nfs4_schedule_state_recovery(server->nfs_client);
4392                                 goto out;
4393                         case -ERESTARTSYS:
4394                                 /*
4395                                  * The show must go on: exit, but mark the
4396                                  * stateid as needing recovery.
4397                                  */
4398                         case -NFS4ERR_ADMIN_REVOKED:
4399                         case -NFS4ERR_BAD_STATEID:
4400                         case -NFS4ERR_OPENMODE:
4401                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4402                                 err = 0;
4403                                 goto out;
4404                         case -ENOMEM:
4405                         case -NFS4ERR_DENIED:
4406                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4407                                 err = 0;
4408                                 goto out;
4409                         case -NFS4ERR_DELAY:
4410                         case -EKEYEXPIRED:
4411                                 break;
4412                 }
4413                 err = nfs4_handle_exception(server, err, &exception);
4414         } while (exception.retry);
4415 out:
4416         return err;
4417 }
4418
4419 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4420
4421 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4422                 size_t buflen, int flags)
4423 {
4424         struct inode *inode = dentry->d_inode;
4425
4426         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4427                 return -EOPNOTSUPP;
4428
4429         return nfs4_proc_set_acl(inode, buf, buflen);
4430 }
4431
4432 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4433  * and that's what we'll do for e.g. user attributes that haven't been set.
4434  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4435  * attributes in kernel-managed attribute namespaces. */
4436 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4437                 size_t buflen)
4438 {
4439         struct inode *inode = dentry->d_inode;
4440
4441         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4442                 return -EOPNOTSUPP;
4443
4444         return nfs4_proc_get_acl(inode, buf, buflen);
4445 }
4446
4447 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4448 {
4449         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4450
4451         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4452                 return 0;
4453         if (buf && buflen < len)
4454                 return -ERANGE;
4455         if (buf)
4456                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4457         return len;
4458 }
4459
4460 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4461 {
4462         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4463                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4464                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4465                 return;
4466
4467         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4468                 NFS_ATTR_FATTR_NLINK;
4469         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4470         fattr->nlink = 2;
4471 }
4472
4473 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4474                 struct nfs4_fs_locations *fs_locations, struct page *page)
4475 {
4476         struct nfs_server *server = NFS_SERVER(dir);
4477         u32 bitmask[2] = {
4478                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4479                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4480         };
4481         struct nfs4_fs_locations_arg args = {
4482                 .dir_fh = NFS_FH(dir),
4483                 .name = name,
4484                 .page = page,
4485                 .bitmask = bitmask,
4486         };
4487         struct nfs4_fs_locations_res res = {
4488                 .fs_locations = fs_locations,
4489         };
4490         struct rpc_message msg = {
4491                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4492                 .rpc_argp = &args,
4493                 .rpc_resp = &res,
4494         };
4495         int status;
4496
4497         dprintk("%s: start\n", __func__);
4498         nfs_fattr_init(&fs_locations->fattr);
4499         fs_locations->server = server;
4500         fs_locations->nlocations = 0;
4501         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4502         nfs_fixup_referral_attributes(&fs_locations->fattr);
4503         dprintk("%s: returned status = %d\n", __func__, status);
4504         return status;
4505 }
4506
4507 #ifdef CONFIG_NFS_V4_1
4508 /*
4509  * nfs4_proc_exchange_id()
4510  *
4511  * Since the clientid has expired, all compounds using sessions
4512  * associated with the stale clientid will be returning
4513  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4514  * be in some phase of session reset.
4515  */
4516 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4517 {
4518         nfs4_verifier verifier;
4519         struct nfs41_exchange_id_args args = {
4520                 .client = clp,
4521                 .flags = clp->cl_exchange_flags,
4522         };
4523         struct nfs41_exchange_id_res res = {
4524                 .client = clp,
4525         };
4526         int status;
4527         struct rpc_message msg = {
4528                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4529                 .rpc_argp = &args,
4530                 .rpc_resp = &res,
4531                 .rpc_cred = cred,
4532         };
4533         __be32 *p;
4534
4535         dprintk("--> %s\n", __func__);
4536         BUG_ON(clp == NULL);
4537
4538         /* Remove server-only flags */
4539         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4540
4541         p = (u32 *)verifier.data;
4542         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4543         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4544         args.verifier = &verifier;
4545
4546         while (1) {
4547                 args.id_len = scnprintf(args.id, sizeof(args.id),
4548                                         "%s/%s %u",
4549                                         clp->cl_ipaddr,
4550                                         rpc_peeraddr2str(clp->cl_rpcclient,
4551                                                          RPC_DISPLAY_ADDR),
4552                                         clp->cl_id_uniquifier);
4553
4554                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4555
4556                 if (status != -NFS4ERR_CLID_INUSE)
4557                         break;
4558
4559                 if (signalled())
4560                         break;
4561
4562                 if (++clp->cl_id_uniquifier == 0)
4563                         break;
4564         }
4565
4566         dprintk("<-- %s status= %d\n", __func__, status);
4567         return status;
4568 }
4569
4570 struct nfs4_get_lease_time_data {
4571         struct nfs4_get_lease_time_args *args;
4572         struct nfs4_get_lease_time_res *res;
4573         struct nfs_client *clp;
4574 };
4575
4576 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4577                                         void *calldata)
4578 {
4579         int ret;
4580         struct nfs4_get_lease_time_data *data =
4581                         (struct nfs4_get_lease_time_data *)calldata;
4582
4583         dprintk("--> %s\n", __func__);
4584         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4585         /* just setup sequence, do not trigger session recovery
4586            since we're invoked within one */
4587         ret = nfs41_setup_sequence(data->clp->cl_session,
4588                                    &data->args->la_seq_args,
4589                                    &data->res->lr_seq_res, 0, task);
4590
4591         BUG_ON(ret == -EAGAIN);
4592         rpc_call_start(task);
4593         dprintk("<-- %s\n", __func__);
4594 }
4595
4596 /*
4597  * Called from nfs4_state_manager thread for session setup, so don't recover
4598  * from sequence operation or clientid errors.
4599  */
4600 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4601 {
4602         struct nfs4_get_lease_time_data *data =
4603                         (struct nfs4_get_lease_time_data *)calldata;
4604
4605         dprintk("--> %s\n", __func__);
4606         nfs41_sequence_done(&data->res->lr_seq_res);
4607         switch (task->tk_status) {
4608         case -NFS4ERR_DELAY:
4609         case -NFS4ERR_GRACE:
4610         case -EKEYEXPIRED:
4611                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4612                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4613                 task->tk_status = 0;
4614                 nfs_restart_rpc(task, data->clp);
4615                 return;
4616         }
4617         dprintk("<-- %s\n", __func__);
4618 }
4619
4620 struct rpc_call_ops nfs4_get_lease_time_ops = {
4621         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4622         .rpc_call_done = nfs4_get_lease_time_done,
4623 };
4624
4625 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4626 {
4627         struct rpc_task *task;
4628         struct nfs4_get_lease_time_args args;
4629         struct nfs4_get_lease_time_res res = {
4630                 .lr_fsinfo = fsinfo,
4631         };
4632         struct nfs4_get_lease_time_data data = {
4633                 .args = &args,
4634                 .res = &res,
4635                 .clp = clp,
4636         };
4637         struct rpc_message msg = {
4638                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4639                 .rpc_argp = &args,
4640                 .rpc_resp = &res,
4641         };
4642         struct rpc_task_setup task_setup = {
4643                 .rpc_client = clp->cl_rpcclient,
4644                 .rpc_message = &msg,
4645                 .callback_ops = &nfs4_get_lease_time_ops,
4646                 .callback_data = &data
4647         };
4648         int status;
4649
4650         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4651         dprintk("--> %s\n", __func__);
4652         task = rpc_run_task(&task_setup);
4653
4654         if (IS_ERR(task))
4655                 status = PTR_ERR(task);
4656         else {
4657                 status = task->tk_status;
4658                 rpc_put_task(task);
4659         }
4660         dprintk("<-- %s return %d\n", __func__, status);
4661
4662         return status;
4663 }
4664
4665 /*
4666  * Reset a slot table
4667  */
4668 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4669                                  int ivalue)
4670 {
4671         struct nfs4_slot *new = NULL;
4672         int i;
4673         int ret = 0;
4674
4675         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4676                 max_reqs, tbl->max_slots);
4677
4678         /* Does the newly negotiated max_reqs match the existing slot table? */
4679         if (max_reqs != tbl->max_slots) {
4680                 ret = -ENOMEM;
4681                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4682                               GFP_NOFS);
4683                 if (!new)
4684                         goto out;
4685                 ret = 0;
4686                 kfree(tbl->slots);
4687         }
4688         spin_lock(&tbl->slot_tbl_lock);
4689         if (new) {
4690                 tbl->slots = new;
4691                 tbl->max_slots = max_reqs;
4692         }
4693         for (i = 0; i < tbl->max_slots; ++i)
4694                 tbl->slots[i].seq_nr = ivalue;
4695         spin_unlock(&tbl->slot_tbl_lock);
4696         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4697                 tbl, tbl->slots, tbl->max_slots);
4698 out:
4699         dprintk("<-- %s: return %d\n", __func__, ret);
4700         return ret;
4701 }
4702
4703 /*
4704  * Reset the forechannel and backchannel slot tables
4705  */
4706 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4707 {
4708         int status;
4709
4710         status = nfs4_reset_slot_table(&session->fc_slot_table,
4711                         session->fc_attrs.max_reqs, 1);
4712         if (status)
4713                 return status;
4714
4715         status = nfs4_reset_slot_table(&session->bc_slot_table,
4716                         session->bc_attrs.max_reqs, 0);
4717         return status;
4718 }
4719
4720 /* Destroy the slot table */
4721 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4722 {
4723         if (session->fc_slot_table.slots != NULL) {
4724                 kfree(session->fc_slot_table.slots);
4725                 session->fc_slot_table.slots = NULL;
4726         }
4727         if (session->bc_slot_table.slots != NULL) {
4728                 kfree(session->bc_slot_table.slots);
4729                 session->bc_slot_table.slots = NULL;
4730         }
4731         return;
4732 }
4733
4734 /*
4735  * Initialize slot table
4736  */
4737 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4738                 int max_slots, int ivalue)
4739 {
4740         struct nfs4_slot *slot;
4741         int ret = -ENOMEM;
4742
4743         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4744
4745         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4746
4747         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4748         if (!slot)
4749                 goto out;
4750         ret = 0;
4751
4752         spin_lock(&tbl->slot_tbl_lock);
4753         tbl->max_slots = max_slots;
4754         tbl->slots = slot;
4755         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4756         spin_unlock(&tbl->slot_tbl_lock);
4757         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4758                 tbl, tbl->slots, tbl->max_slots);
4759 out:
4760         dprintk("<-- %s: return %d\n", __func__, ret);
4761         return ret;
4762 }
4763
4764 /*
4765  * Initialize the forechannel and backchannel tables
4766  */
4767 static int nfs4_init_slot_tables(struct nfs4_session *session)
4768 {
4769         struct nfs4_slot_table *tbl;
4770         int status = 0;
4771
4772         tbl = &session->fc_slot_table;
4773         if (tbl->slots == NULL) {
4774                 status = nfs4_init_slot_table(tbl,
4775                                 session->fc_attrs.max_reqs, 1);
4776                 if (status)
4777                         return status;
4778         }
4779
4780         tbl = &session->bc_slot_table;
4781         if (tbl->slots == NULL) {
4782                 status = nfs4_init_slot_table(tbl,
4783                                 session->bc_attrs.max_reqs, 0);
4784                 if (status)
4785                         nfs4_destroy_slot_tables(session);
4786         }
4787
4788         return status;
4789 }
4790
4791 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4792 {
4793         struct nfs4_session *session;
4794         struct nfs4_slot_table *tbl;
4795
4796         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4797         if (!session)
4798                 return NULL;
4799
4800         /*
4801          * The create session reply races with the server back
4802          * channel probe. Mark the client NFS_CS_SESSION_INITING
4803          * so that the client back channel can find the
4804          * nfs_client struct
4805          */
4806         clp->cl_cons_state = NFS_CS_SESSION_INITING;
4807         init_completion(&session->complete);
4808
4809         tbl = &session->fc_slot_table;
4810         tbl->highest_used_slotid = -1;
4811         spin_lock_init(&tbl->slot_tbl_lock);
4812         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4813
4814         tbl = &session->bc_slot_table;
4815         tbl->highest_used_slotid = -1;
4816         spin_lock_init(&tbl->slot_tbl_lock);
4817         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4818
4819         session->clp = clp;
4820         return session;
4821 }
4822
4823 void nfs4_destroy_session(struct nfs4_session *session)
4824 {
4825         nfs4_proc_destroy_session(session);
4826         dprintk("%s Destroy backchannel for xprt %p\n",
4827                 __func__, session->clp->cl_rpcclient->cl_xprt);
4828         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4829                                 NFS41_BC_MIN_CALLBACKS);
4830         nfs4_destroy_slot_tables(session);
4831         kfree(session);
4832 }
4833
4834 /*
4835  * Initialize the values to be used by the client in CREATE_SESSION
4836  * If nfs4_init_session set the fore channel request and response sizes,
4837  * use them.
4838  *
4839  * Set the back channel max_resp_sz_cached to zero to force the client to
4840  * always set csa_cachethis to FALSE because the current implementation
4841  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4842  */
4843 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4844 {
4845         struct nfs4_session *session = args->client->cl_session;
4846         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4847                      mxresp_sz = session->fc_attrs.max_resp_sz;
4848
4849         if (mxrqst_sz == 0)
4850                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4851         if (mxresp_sz == 0)
4852                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4853         /* Fore channel attributes */
4854         args->fc_attrs.headerpadsz = 0;
4855         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4856         args->fc_attrs.max_resp_sz = mxresp_sz;
4857         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4858         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4859
4860         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4861                 "max_ops=%u max_reqs=%u\n",
4862                 __func__,
4863                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4864                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4865
4866         /* Back channel attributes */
4867         args->bc_attrs.headerpadsz = 0;
4868         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4869         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4870         args->bc_attrs.max_resp_sz_cached = 0;
4871         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4872         args->bc_attrs.max_reqs = 1;
4873
4874         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4875                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4876                 __func__,
4877                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4878                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4879                 args->bc_attrs.max_reqs);
4880 }
4881
4882 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4883 {
4884         if (rcvd <= sent)
4885                 return 0;
4886         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4887                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4888         return -EINVAL;
4889 }
4890
4891 #define _verify_fore_channel_attr(_name_) \
4892         _verify_channel_attr("fore", #_name_, \
4893                              args->fc_attrs._name_, \
4894                              session->fc_attrs._name_)
4895
4896 #define _verify_back_channel_attr(_name_) \
4897         _verify_channel_attr("back", #_name_, \
4898                              args->bc_attrs._name_, \
4899                              session->bc_attrs._name_)
4900
4901 /*
4902  * The server is not allowed to increase the fore channel header pad size,
4903  * maximum response size, or maximum number of operations.
4904  *
4905  * The back channel attributes are only negotiatied down: We send what the
4906  * (back channel) server insists upon.
4907  */
4908 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4909                                      struct nfs4_session *session)
4910 {
4911         int ret = 0;
4912
4913         ret |= _verify_fore_channel_attr(headerpadsz);
4914         ret |= _verify_fore_channel_attr(max_resp_sz);
4915         ret |= _verify_fore_channel_attr(max_ops);
4916
4917         ret |= _verify_back_channel_attr(headerpadsz);
4918         ret |= _verify_back_channel_attr(max_rqst_sz);
4919         ret |= _verify_back_channel_attr(max_resp_sz);
4920         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4921         ret |= _verify_back_channel_attr(max_ops);
4922         ret |= _verify_back_channel_attr(max_reqs);
4923
4924         return ret;
4925 }
4926
4927 static int _nfs4_proc_create_session(struct nfs_client *clp)
4928 {
4929         struct nfs4_session *session = clp->cl_session;
4930         struct nfs41_create_session_args args = {
4931                 .client = clp,
4932                 .cb_program = NFS4_CALLBACK,
4933         };
4934         struct nfs41_create_session_res res = {
4935                 .client = clp,
4936         };
4937         struct rpc_message msg = {
4938                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4939                 .rpc_argp = &args,
4940                 .rpc_resp = &res,
4941         };
4942         int status;
4943
4944         nfs4_init_channel_attrs(&args);
4945         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4946
4947         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4948
4949         if (!status)
4950                 /* Verify the session's negotiated channel_attrs values */
4951                 status = nfs4_verify_channel_attrs(&args, session);
4952         if (!status) {
4953                 /* Increment the clientid slot sequence id */
4954                 clp->cl_seqid++;
4955         }
4956
4957         return status;
4958 }
4959
4960 /*
4961  * Issues a CREATE_SESSION operation to the server.
4962  * It is the responsibility of the caller to verify the session is
4963  * expired before calling this routine.
4964  */
4965 int nfs4_proc_create_session(struct nfs_client *clp)
4966 {
4967         int status;
4968         unsigned *ptr;
4969         struct nfs4_session *session = clp->cl_session;
4970
4971         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4972
4973         status = _nfs4_proc_create_session(clp);
4974         if (status)
4975                 goto out;
4976
4977         /* Init and reset the fore channel */
4978         status = nfs4_init_slot_tables(session);
4979         dprintk("slot table initialization returned %d\n", status);
4980         if (status)
4981                 goto out;
4982         status = nfs4_reset_slot_tables(session);
4983         dprintk("slot table reset returned %d\n", status);
4984         if (status)
4985                 goto out;
4986
4987         ptr = (unsigned *)&session->sess_id.data[0];
4988         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4989                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4990 out:
4991         dprintk("<-- %s\n", __func__);
4992         return status;
4993 }
4994
4995 /*
4996  * Issue the over-the-wire RPC DESTROY_SESSION.
4997  * The caller must serialize access to this routine.
4998  */
4999 int nfs4_proc_destroy_session(struct nfs4_session *session)
5000 {
5001         int status = 0;
5002         struct rpc_message msg;
5003
5004         dprintk("--> nfs4_proc_destroy_session\n");
5005
5006         /* session is still being setup */
5007         if (session->clp->cl_cons_state != NFS_CS_READY)
5008                 return status;
5009
5010         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5011         msg.rpc_argp = session;
5012         msg.rpc_resp = NULL;
5013         msg.rpc_cred = NULL;
5014         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5015
5016         if (status)
5017                 printk(KERN_WARNING
5018                         "Got error %d from the server on DESTROY_SESSION. "
5019                         "Session has been destroyed regardless...\n", status);
5020
5021         dprintk("<-- nfs4_proc_destroy_session\n");
5022         return status;
5023 }
5024
5025 int nfs4_init_session(struct nfs_server *server)
5026 {
5027         struct nfs_client *clp = server->nfs_client;
5028         struct nfs4_session *session;
5029         unsigned int rsize, wsize;
5030         int ret;
5031
5032         if (!nfs4_has_session(clp))
5033                 return 0;
5034
5035         rsize = server->rsize;
5036         if (rsize == 0)
5037                 rsize = NFS_MAX_FILE_IO_SIZE;
5038         wsize = server->wsize;
5039         if (wsize == 0)
5040                 wsize = NFS_MAX_FILE_IO_SIZE;
5041
5042         session = clp->cl_session;
5043         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5044         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5045
5046         ret = nfs4_recover_expired_lease(server);
5047         if (!ret)
5048                 ret = nfs4_check_client_ready(clp);
5049         return ret;
5050 }
5051
5052 /*
5053  * Renew the cl_session lease.
5054  */
5055 struct nfs4_sequence_data {
5056         struct nfs_client *clp;
5057         struct nfs4_sequence_args args;
5058         struct nfs4_sequence_res res;
5059 };
5060
5061 static void nfs41_sequence_release(void *data)
5062 {
5063         struct nfs4_sequence_data *calldata = data;
5064         struct nfs_client *clp = calldata->clp;
5065
5066         if (atomic_read(&clp->cl_count) > 1)
5067                 nfs4_schedule_state_renewal(clp);
5068         nfs_put_client(clp);
5069         kfree(calldata);
5070 }
5071
5072 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5073 {
5074         switch(task->tk_status) {
5075         case -NFS4ERR_DELAY:
5076         case -EKEYEXPIRED:
5077                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5078                 return -EAGAIN;
5079         default:
5080                 nfs4_schedule_state_recovery(clp);
5081         }
5082         return 0;
5083 }
5084
5085 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5086 {
5087         struct nfs4_sequence_data *calldata = data;
5088         struct nfs_client *clp = calldata->clp;
5089
5090         nfs41_sequence_done(task->tk_msg.rpc_resp);
5091
5092         if (task->tk_status < 0) {
5093                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5094                 if (atomic_read(&clp->cl_count) == 1)
5095                         goto out;
5096
5097                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5098                         rpc_restart_call_prepare(task);
5099                         return;
5100                 }
5101         }
5102         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5103 out:
5104         dprintk("<-- %s\n", __func__);
5105 }
5106
5107 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5108 {
5109         struct nfs4_sequence_data *calldata = data;
5110         struct nfs_client *clp = calldata->clp;
5111         struct nfs4_sequence_args *args;
5112         struct nfs4_sequence_res *res;
5113
5114         args = task->tk_msg.rpc_argp;
5115         res = task->tk_msg.rpc_resp;
5116
5117         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5118                 return;
5119         rpc_call_start(task);
5120 }
5121
5122 static const struct rpc_call_ops nfs41_sequence_ops = {
5123         .rpc_call_done = nfs41_sequence_call_done,
5124         .rpc_call_prepare = nfs41_sequence_prepare,
5125         .rpc_release = nfs41_sequence_release,
5126 };
5127
5128 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5129 {
5130         struct nfs4_sequence_data *calldata;
5131         struct rpc_message msg = {
5132                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5133                 .rpc_cred = cred,
5134         };
5135         struct rpc_task_setup task_setup_data = {
5136                 .rpc_client = clp->cl_rpcclient,
5137                 .rpc_message = &msg,
5138                 .callback_ops = &nfs41_sequence_ops,
5139                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5140         };
5141
5142         if (!atomic_inc_not_zero(&clp->cl_count))
5143                 return ERR_PTR(-EIO);
5144         calldata = kmalloc(sizeof(*calldata), GFP_NOFS);
5145         if (calldata == NULL) {
5146                 nfs_put_client(clp);
5147                 return ERR_PTR(-ENOMEM);
5148         }
5149         calldata->res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5150         msg.rpc_argp = &calldata->args;
5151         msg.rpc_resp = &calldata->res;
5152         calldata->clp = clp;
5153         task_setup_data.callback_data = calldata;
5154
5155         return rpc_run_task(&task_setup_data);
5156 }
5157
5158 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5159 {
5160         struct rpc_task *task;
5161         int ret = 0;
5162
5163         task = _nfs41_proc_sequence(clp, cred);
5164         if (IS_ERR(task))
5165                 ret = PTR_ERR(task);
5166         else
5167                 rpc_put_task(task);
5168         dprintk("<-- %s status=%d\n", __func__, ret);
5169         return ret;
5170 }
5171
5172 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5173 {
5174         struct rpc_task *task;
5175         int ret;
5176
5177         task = _nfs41_proc_sequence(clp, cred);
5178         if (IS_ERR(task)) {
5179                 ret = PTR_ERR(task);
5180                 goto out;
5181         }
5182         ret = rpc_wait_for_completion_task(task);
5183         if (!ret)
5184                 ret = task->tk_status;
5185         rpc_put_task(task);
5186 out:
5187         dprintk("<-- %s status=%d\n", __func__, ret);
5188         return ret;
5189 }
5190
5191 struct nfs4_reclaim_complete_data {
5192         struct nfs_client *clp;
5193         struct nfs41_reclaim_complete_args arg;
5194         struct nfs41_reclaim_complete_res res;
5195 };
5196
5197 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5198 {
5199         struct nfs4_reclaim_complete_data *calldata = data;
5200
5201         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5202         if (nfs41_setup_sequence(calldata->clp->cl_session,
5203                                 &calldata->arg.seq_args,
5204                                 &calldata->res.seq_res, 0, task))
5205                 return;
5206
5207         rpc_call_start(task);
5208 }
5209
5210 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5211 {
5212         switch(task->tk_status) {
5213         case 0:
5214         case -NFS4ERR_COMPLETE_ALREADY:
5215         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5216                 break;
5217         case -NFS4ERR_DELAY:
5218         case -EKEYEXPIRED:
5219                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5220                 return -EAGAIN;
5221         default:
5222                 nfs4_schedule_state_recovery(clp);
5223         }
5224         return 0;
5225 }
5226
5227 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5228 {
5229         struct nfs4_reclaim_complete_data *calldata = data;
5230         struct nfs_client *clp = calldata->clp;
5231         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5232
5233         dprintk("--> %s\n", __func__);
5234         nfs41_sequence_done(res);
5235
5236         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5237                 rpc_restart_call_prepare(task);
5238                 return;
5239         }
5240         dprintk("<-- %s\n", __func__);
5241 }
5242
5243 static void nfs4_free_reclaim_complete_data(void *data)
5244 {
5245         struct nfs4_reclaim_complete_data *calldata = data;
5246
5247         kfree(calldata);
5248 }
5249
5250 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5251         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5252         .rpc_call_done = nfs4_reclaim_complete_done,
5253         .rpc_release = nfs4_free_reclaim_complete_data,
5254 };
5255
5256 /*
5257  * Issue a global reclaim complete.
5258  */
5259 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5260 {
5261         struct nfs4_reclaim_complete_data *calldata;
5262         struct rpc_task *task;
5263         struct rpc_message msg = {
5264                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5265         };
5266         struct rpc_task_setup task_setup_data = {
5267                 .rpc_client = clp->cl_rpcclient,
5268                 .rpc_message = &msg,
5269                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5270                 .flags = RPC_TASK_ASYNC,
5271         };
5272         int status = -ENOMEM;
5273
5274         dprintk("--> %s\n", __func__);
5275         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5276         if (calldata == NULL)
5277                 goto out;
5278         calldata->clp = clp;
5279         calldata->arg.one_fs = 0;
5280         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5281
5282         msg.rpc_argp = &calldata->arg;
5283         msg.rpc_resp = &calldata->res;
5284         task_setup_data.callback_data = calldata;
5285         task = rpc_run_task(&task_setup_data);
5286         if (IS_ERR(task)) {
5287                 status = PTR_ERR(task);
5288                 goto out;
5289         }
5290         rpc_put_task(task);
5291         return 0;
5292 out:
5293         dprintk("<-- %s status=%d\n", __func__, status);
5294         return status;
5295 }
5296 #endif /* CONFIG_NFS_V4_1 */
5297
5298 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5299         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5300         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5301         .recover_open   = nfs4_open_reclaim,
5302         .recover_lock   = nfs4_lock_reclaim,
5303         .establish_clid = nfs4_init_clientid,
5304         .get_clid_cred  = nfs4_get_setclientid_cred,
5305 };
5306
5307 #if defined(CONFIG_NFS_V4_1)
5308 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5309         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5310         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5311         .recover_open   = nfs4_open_reclaim,
5312         .recover_lock   = nfs4_lock_reclaim,
5313         .establish_clid = nfs41_init_clientid,
5314         .get_clid_cred  = nfs4_get_exchange_id_cred,
5315         .reclaim_complete = nfs41_proc_reclaim_complete,
5316 };
5317 #endif /* CONFIG_NFS_V4_1 */
5318
5319 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5320         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5321         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5322         .recover_open   = nfs4_open_expired,
5323         .recover_lock   = nfs4_lock_expired,
5324         .establish_clid = nfs4_init_clientid,
5325         .get_clid_cred  = nfs4_get_setclientid_cred,
5326 };
5327
5328 #if defined(CONFIG_NFS_V4_1)
5329 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5330         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5331         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5332         .recover_open   = nfs4_open_expired,
5333         .recover_lock   = nfs4_lock_expired,
5334         .establish_clid = nfs41_init_clientid,
5335         .get_clid_cred  = nfs4_get_exchange_id_cred,
5336 };
5337 #endif /* CONFIG_NFS_V4_1 */
5338
5339 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5340         .sched_state_renewal = nfs4_proc_async_renew,
5341         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5342         .renew_lease = nfs4_proc_renew,
5343 };
5344
5345 #if defined(CONFIG_NFS_V4_1)
5346 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5347         .sched_state_renewal = nfs41_proc_async_sequence,
5348         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5349         .renew_lease = nfs4_proc_sequence,
5350 };
5351 #endif
5352
5353 /*
5354  * Per minor version reboot and network partition recovery ops
5355  */
5356
5357 struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[] = {
5358         &nfs40_reboot_recovery_ops,
5359 #if defined(CONFIG_NFS_V4_1)
5360         &nfs41_reboot_recovery_ops,
5361 #endif
5362 };
5363
5364 struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[] = {
5365         &nfs40_nograce_recovery_ops,
5366 #if defined(CONFIG_NFS_V4_1)
5367         &nfs41_nograce_recovery_ops,
5368 #endif
5369 };
5370
5371 struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[] = {
5372         &nfs40_state_renewal_ops,
5373 #if defined(CONFIG_NFS_V4_1)
5374         &nfs41_state_renewal_ops,
5375 #endif
5376 };
5377
5378 static const struct inode_operations nfs4_file_inode_operations = {
5379         .permission     = nfs_permission,
5380         .getattr        = nfs_getattr,
5381         .setattr        = nfs_setattr,
5382         .getxattr       = nfs4_getxattr,
5383         .setxattr       = nfs4_setxattr,
5384         .listxattr      = nfs4_listxattr,
5385 };
5386
5387 const struct nfs_rpc_ops nfs_v4_clientops = {
5388         .version        = 4,                    /* protocol version */
5389         .dentry_ops     = &nfs4_dentry_operations,
5390         .dir_inode_ops  = &nfs4_dir_inode_operations,
5391         .file_inode_ops = &nfs4_file_inode_operations,
5392         .getroot        = nfs4_proc_get_root,
5393         .getattr        = nfs4_proc_getattr,
5394         .setattr        = nfs4_proc_setattr,
5395         .lookupfh       = nfs4_proc_lookupfh,
5396         .lookup         = nfs4_proc_lookup,
5397         .access         = nfs4_proc_access,
5398         .readlink       = nfs4_proc_readlink,
5399         .create         = nfs4_proc_create,
5400         .remove         = nfs4_proc_remove,
5401         .unlink_setup   = nfs4_proc_unlink_setup,
5402         .unlink_done    = nfs4_proc_unlink_done,
5403         .rename         = nfs4_proc_rename,
5404         .link           = nfs4_proc_link,
5405         .symlink        = nfs4_proc_symlink,
5406         .mkdir          = nfs4_proc_mkdir,
5407         .rmdir          = nfs4_proc_remove,
5408         .readdir        = nfs4_proc_readdir,
5409         .mknod          = nfs4_proc_mknod,
5410         .statfs         = nfs4_proc_statfs,
5411         .fsinfo         = nfs4_proc_fsinfo,
5412         .pathconf       = nfs4_proc_pathconf,
5413         .set_capabilities = nfs4_server_capabilities,
5414         .decode_dirent  = nfs4_decode_dirent,
5415         .read_setup     = nfs4_proc_read_setup,
5416         .read_done      = nfs4_read_done,
5417         .write_setup    = nfs4_proc_write_setup,
5418         .write_done     = nfs4_write_done,
5419         .commit_setup   = nfs4_proc_commit_setup,
5420         .commit_done    = nfs4_commit_done,
5421         .lock           = nfs4_proc_lock,
5422         .clear_acl_cache = nfs4_zap_acl_attr,
5423         .close_context  = nfs4_close_context,
5424 };
5425
5426 /*
5427  * Local variables:
5428  *  c-basic-offset: 8
5429  * End:
5430  */