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 #include <linux/xattr.h>
  53 #include <linux/utsname.h>
  54 #include <linux/mm.h>
  55
  56 #include "nfs4_fs.h"
  57 #include "delegation.h"
  58 #include "internal.h"
  59 #include "iostat.h"
  60 #include "callback.h"
  61 #include "pnfs.h"
  62
  63 #define NFSDBG_FACILITY         NFSDBG_PROC
  64
  65 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  66 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  67
  68 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  69
  70 struct nfs4_opendata;
  71 static int _nfs4_proc_open(struct nfs4_opendata *data);
  72 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  73 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  74 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  75 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  76 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  77 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  78                             struct nfs_fattr *fattr, struct iattr *sattr,
  79                             struct nfs4_state *state);
  80
  81 /* Prevent leaks of NFSv4 errors into userland */
  82 static int nfs4_map_errors(int err)
  83 {
  84         if (err >= -1000)
  85                 return err;
  86         switch (err) {
  87         case -NFS4ERR_RESOURCE:
  88                 return -EREMOTEIO;
  89         default:
  90                 dprintk("%s could not handle NFSv4 error %d\n",
  91                                 __func__, -err);
  92                 break;
  93         }
  94         return -EIO;
  95 }
  96
  97 /*
  98  * This is our standard bitmap for GETATTR requests.
  99  */
 100 const u32 nfs4_fattr_bitmap[2] = {
 101         FATTR4_WORD0_TYPE
 102         | FATTR4_WORD0_CHANGE
 103         | FATTR4_WORD0_SIZE
 104         | FATTR4_WORD0_FSID
 105         | FATTR4_WORD0_FILEID,
 106         FATTR4_WORD1_MODE
 107         | FATTR4_WORD1_NUMLINKS
 108         | FATTR4_WORD1_OWNER
 109         | FATTR4_WORD1_OWNER_GROUP
 110         | FATTR4_WORD1_RAWDEV
 111         | FATTR4_WORD1_SPACE_USED
 112         | FATTR4_WORD1_TIME_ACCESS
 113         | FATTR4_WORD1_TIME_METADATA
 114         | FATTR4_WORD1_TIME_MODIFY
 115 };
 116
 117 const u32 nfs4_statfs_bitmap[2] = {
 118         FATTR4_WORD0_FILES_AVAIL
 119         | FATTR4_WORD0_FILES_FREE
 120         | FATTR4_WORD0_FILES_TOTAL,
 121         FATTR4_WORD1_SPACE_AVAIL
 122         | FATTR4_WORD1_SPACE_FREE
 123         | FATTR4_WORD1_SPACE_TOTAL
 124 };
 125
 126 const u32 nfs4_pathconf_bitmap[2] = {
 127         FATTR4_WORD0_MAXLINK
 128         | FATTR4_WORD0_MAXNAME,
 129         0
 130 };
 131
 132 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 133                         | FATTR4_WORD0_MAXREAD
 134                         | FATTR4_WORD0_MAXWRITE
 135                         | FATTR4_WORD0_LEASE_TIME,
 136                         FATTR4_WORD1_TIME_DELTA
 137                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 138 };
 139
 140 const u32 nfs4_fs_locations_bitmap[2] = {
 141         FATTR4_WORD0_TYPE
 142         | FATTR4_WORD0_CHANGE
 143         | FATTR4_WORD0_SIZE
 144         | FATTR4_WORD0_FSID
 145         | FATTR4_WORD0_FILEID
 146         | FATTR4_WORD0_FS_LOCATIONS,
 147         FATTR4_WORD1_MODE
 148         | FATTR4_WORD1_NUMLINKS
 149         | FATTR4_WORD1_OWNER
 150         | FATTR4_WORD1_OWNER_GROUP
 151         | FATTR4_WORD1_RAWDEV
 152         | FATTR4_WORD1_SPACE_USED
 153         | FATTR4_WORD1_TIME_ACCESS
 154         | FATTR4_WORD1_TIME_METADATA
 155         | FATTR4_WORD1_TIME_MODIFY
 156         | FATTR4_WORD1_MOUNTED_ON_FILEID
 157 };
 158
 159 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 160                 struct nfs4_readdir_arg *readdir)
 161 {
 162         __be32 *start, *p;
 163
 164         BUG_ON(readdir->count < 80);
 165         if (cookie > 2) {
 166                 readdir->cookie = cookie;
 167                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 168                 return;
 169         }
 170
 171         readdir->cookie = 0;
 172         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 173         if (cookie == 2)
 174                 return;
 175
 176         /*
 177          * NFSv4 servers do not return entries for '.' and '..'
 178          * Therefore, we fake these entries here.  We let '.'
 179          * have cookie 0 and '..' have cookie 1.  Note that
 180          * when talking to the server, we always send cookie 0
 181          * instead of 1 or 2.
 182          */
 183         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 184
 185         if (cookie == 0) {
 186                 *p++ = xdr_one;                                  /* next */
 187                 *p++ = xdr_zero;                   /* cookie, first word */
 188                 *p++ = xdr_one;                   /* cookie, second word */
 189                 *p++ = xdr_one;                             /* entry len */
 190                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 191                 p++;
 192                 *p++ = xdr_one;                         /* bitmap length */
 193                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 194                 *p++ = htonl(8);              /* attribute buffer length */
 195                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 196         }
 197
 198         *p++ = xdr_one;                                  /* next */
 199         *p++ = xdr_zero;                   /* cookie, first word */
 200         *p++ = xdr_two;                   /* cookie, second word */
 201         *p++ = xdr_two;                             /* entry len */
 202         memcpy(p, "..\0\0", 4);                         /* entry */
 203         p++;
 204         *p++ = xdr_one;                         /* bitmap length */
 205         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 206         *p++ = htonl(8);              /* attribute buffer length */
 207         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 208
 209         readdir->pgbase = (char *)p - (char *)start;
 210         readdir->count -= readdir->pgbase;
 211         kunmap_atomic(start, KM_USER0);
 212 }
 213
 214 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 215 {
 216         int res;
 217
 218         might_sleep();
 219
 220         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 221                         nfs_wait_bit_killable, TASK_KILLABLE);
 222         return res;
 223 }
 224
 225 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 226 {
 227         int res = 0;
 228
 229         might_sleep();
 230
 231         if (*timeout <= 0)
 232                 *timeout = NFS4_POLL_RETRY_MIN;
 233         if (*timeout > NFS4_POLL_RETRY_MAX)
 234                 *timeout = NFS4_POLL_RETRY_MAX;
 235         schedule_timeout_killable(*timeout);
 236         if (fatal_signal_pending(current))
 237                 res = -ERESTARTSYS;
 238         *timeout <<= 1;
 239         return res;
 240 }
 241
 242 /* This is the error handling routine for processes that are allowed
 243  * to sleep.
 244  */
 245 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 246 {
 247         struct nfs_client *clp = server->nfs_client;
 248         struct nfs4_state *state = exception->state;
 249         int ret = errorcode;
 250
 251         exception->retry = 0;
 252         switch(errorcode) {
 253                 case 0:
 254                         return 0;
 255                 case -NFS4ERR_ADMIN_REVOKED:
 256                 case -NFS4ERR_BAD_STATEID:
 257                 case -NFS4ERR_OPENMODE:
 258                         if (state == NULL)
 259                                 break;
 260                         nfs4_state_mark_reclaim_nograce(clp, state);
 261                         goto do_state_recovery;
 262                 case -NFS4ERR_STALE_STATEID:
 263                 case -NFS4ERR_STALE_CLIENTID:
 264                 case -NFS4ERR_EXPIRED:
 265                         goto do_state_recovery;
 266 #if defined(CONFIG_NFS_V4_1)
 267                 case -NFS4ERR_BADSESSION:
 268                 case -NFS4ERR_BADSLOT:
 269                 case -NFS4ERR_BAD_HIGH_SLOT:
 270                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 271                 case -NFS4ERR_DEADSESSION:
 272                 case -NFS4ERR_SEQ_FALSE_RETRY:
 273                 case -NFS4ERR_SEQ_MISORDERED:
 274                         dprintk("%s ERROR: %d Reset session\n", __func__,
 275                                 errorcode);
 276                         nfs4_schedule_state_recovery(clp);
 277                         exception->retry = 1;
 278                         break;
 279 #endif /* defined(CONFIG_NFS_V4_1) */
 280                 case -NFS4ERR_FILE_OPEN:
 281                         if (exception->timeout > HZ) {
 282                                 /* We have retried a decent amount, time to
 283                                  * fail
 284                                  */
 285                                 ret = -EBUSY;
 286                                 break;
 287                         }
 288                 case -NFS4ERR_GRACE:
 289                 case -NFS4ERR_DELAY:
 290                 case -EKEYEXPIRED:
 291                         ret = nfs4_delay(server->client, &exception->timeout);
 292                         if (ret != 0)
 293                                 break;
 294                 case -NFS4ERR_OLD_STATEID:
 295                         exception->retry = 1;
 296         }
 297         /* We failed to handle the error */
 298         return nfs4_map_errors(ret);
 299 do_state_recovery:
 300         nfs4_schedule_state_recovery(clp);
 301         ret = nfs4_wait_clnt_recover(clp);
 302         if (ret == 0)
 303                 exception->retry = 1;
 304         return ret;
 305 }
 306
 307
 308 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 309 {
 310         spin_lock(&clp->cl_lock);
 311         if (time_before(clp->cl_last_renewal,timestamp))
 312                 clp->cl_last_renewal = timestamp;
 313         spin_unlock(&clp->cl_lock);
 314 }
 315
 316 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 317 {
 318         do_renew_lease(server->nfs_client, timestamp);
 319 }
 320
 321 #if defined(CONFIG_NFS_V4_1)
 322
 323 /*
 324  * nfs4_free_slot - free a slot and efficiently update slot table.
 325  *
 326  * freeing a slot is trivially done by clearing its respective bit
 327  * in the bitmap.
 328  * If the freed slotid equals highest_used_slotid we want to update it
 329  * so that the server would be able to size down the slot table if needed,
 330  * otherwise we know that the highest_used_slotid is still in use.
 331  * When updating highest_used_slotid there may be "holes" in the bitmap
 332  * so we need to scan down from highest_used_slotid to 0 looking for the now
 333  * highest slotid in use.
 334  * If none found, highest_used_slotid is set to -1.
 335  *
 336  * Must be called while holding tbl->slot_tbl_lock
 337  */
 338 static void
 339 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 340 {
 341         int free_slotid = free_slot - tbl->slots;
 342         int slotid = free_slotid;
 343
 344         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 345         /* clear used bit in bitmap */
 346         __clear_bit(slotid, tbl->used_slots);
 347
 348         /* update highest_used_slotid when it is freed */
 349         if (slotid == tbl->highest_used_slotid) {
 350                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 351                 if (slotid < tbl->max_slots)
 352                         tbl->highest_used_slotid = slotid;
 353                 else
 354                         tbl->highest_used_slotid = -1;
 355         }
 356         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 357                 free_slotid, tbl->highest_used_slotid);
 358 }
 359
 360 /*
 361  * Signal state manager thread if session fore channel is drained
 362  */
 363 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 364 {
 365         struct rpc_task *task;
 366
 367         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 368                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 369                 if (task)
 370                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 371                 return;
 372         }
 373
 374         if (ses->fc_slot_table.highest_used_slotid != -1)
 375                 return;
 376
 377         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 378         complete(&ses->fc_slot_table.complete);
 379 }
 380
 381 /*
 382  * Signal state manager thread if session back channel is drained
 383  */
 384 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 385 {
 386         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 387             ses->bc_slot_table.highest_used_slotid != -1)
 388                 return;
 389         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 390         complete(&ses->bc_slot_table.complete);
 391 }
 392
 393 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 394 {
 395         struct nfs4_slot_table *tbl;
 396
 397         tbl = &res->sr_session->fc_slot_table;
 398         if (!res->sr_slot) {
 399                 /* just wake up the next guy waiting since
 400                  * we may have not consumed a slot after all */
 401                 dprintk("%s: No slot\n", __func__);
 402                 return;
 403         }
 404
 405         spin_lock(&tbl->slot_tbl_lock);
 406         nfs4_free_slot(tbl, res->sr_slot);
 407         nfs4_check_drain_fc_complete(res->sr_session);
 408         spin_unlock(&tbl->slot_tbl_lock);
 409         res->sr_slot = NULL;
 410 }
 411
 412 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 413 {
 414         unsigned long timestamp;
 415         struct nfs_client *clp;
 416
 417         /*
 418          * sr_status remains 1 if an RPC level error occurred. The server
 419          * may or may not have processed the sequence operation..
 420          * Proceed as if the server received and processed the sequence
 421          * operation.
 422          */
 423         if (res->sr_status == 1)
 424                 res->sr_status = NFS_OK;
 425
 426         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 427         if (!res->sr_slot)
 428                 goto out;
 429
 430         /* Check the SEQUENCE operation status */
 431         switch (res->sr_status) {
 432         case 0:
 433                 /* Update the slot's sequence and clientid lease timer */
 434                 ++res->sr_slot->seq_nr;
 435                 timestamp = res->sr_renewal_time;
 436                 clp = res->sr_session->clp;
 437                 do_renew_lease(clp, timestamp);
 438                 /* Check sequence flags */
 439                 if (atomic_read(&clp->cl_count) > 1)
 440                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 441                 break;
 442         case -NFS4ERR_DELAY:
 443                 /* The server detected a resend of the RPC call and
 444                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 445                  * of RFC5661.
 446                  */
 447                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 448                         __func__,
 449                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 450                         res->sr_slot->seq_nr);
 451                 goto out_retry;
 452         default:
 453                 /* Just update the slot sequence no. */
 454                 ++res->sr_slot->seq_nr;
 455         }
 456 out:
 457         /* The session may be reset by one of the error handlers. */
 458         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 459         nfs41_sequence_free_slot(res);
 460         return 1;
 461 out_retry:
 462         if (!rpc_restart_call(task))
 463                 goto out;
 464         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 465         return 0;
 466 }
 467
 468 static int nfs4_sequence_done(struct rpc_task *task,
 469                                struct nfs4_sequence_res *res)
 470 {
 471         if (res->sr_session == NULL)
 472                 return 1;
 473         return nfs41_sequence_done(task, res);
 474 }
 475
 476 /*
 477  * nfs4_find_slot - efficiently look for a free slot
 478  *
 479  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 480  * If found, we mark the slot as used, update the highest_used_slotid,
 481  * and respectively set up the sequence operation args.
 482  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 483  *
 484  * Note: must be called with under the slot_tbl_lock.
 485  */
 486 static u8
 487 nfs4_find_slot(struct nfs4_slot_table *tbl)
 488 {
 489         int slotid;
 490         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 491         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 492
 493         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 494                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 495                 tbl->max_slots);
 496         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 497         if (slotid >= tbl->max_slots)
 498                 goto out;
 499         __set_bit(slotid, tbl->used_slots);
 500         if (slotid > tbl->highest_used_slotid)
 501                 tbl->highest_used_slotid = slotid;
 502         ret_id = slotid;
 503 out:
 504         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 505                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 506         return ret_id;
 507 }
 508
 509 static int nfs41_setup_sequence(struct nfs4_session *session,
 510                                 struct nfs4_sequence_args *args,
 511                                 struct nfs4_sequence_res *res,
 512                                 int cache_reply,
 513                                 struct rpc_task *task)
 514 {
 515         struct nfs4_slot *slot;
 516         struct nfs4_slot_table *tbl;
 517         u8 slotid;
 518
 519         dprintk("--> %s\n", __func__);
 520         /* slot already allocated? */
 521         if (res->sr_slot != NULL)
 522                 return 0;
 523
 524         tbl = &session->fc_slot_table;
 525
 526         spin_lock(&tbl->slot_tbl_lock);
 527         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 528             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 529                 /*
 530                  * The state manager will wait until the slot table is empty.
 531                  * Schedule the reset thread
 532                  */
 533                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 534                 spin_unlock(&tbl->slot_tbl_lock);
 535                 dprintk("%s Schedule Session Reset\n", __func__);
 536                 return -EAGAIN;
 537         }
 538
 539         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 540             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 541                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 542                 spin_unlock(&tbl->slot_tbl_lock);
 543                 dprintk("%s enforce FIFO order\n", __func__);
 544                 return -EAGAIN;
 545         }
 546
 547         slotid = nfs4_find_slot(tbl);
 548         if (slotid == NFS4_MAX_SLOT_TABLE) {
 549                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 550                 spin_unlock(&tbl->slot_tbl_lock);
 551                 dprintk("<-- %s: no free slots\n", __func__);
 552                 return -EAGAIN;
 553         }
 554         spin_unlock(&tbl->slot_tbl_lock);
 555
 556         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 557         slot = tbl->slots + slotid;
 558         args->sa_session = session;
 559         args->sa_slotid = slotid;
 560         args->sa_cache_this = cache_reply;
 561
 562         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 563
 564         res->sr_session = session;
 565         res->sr_slot = slot;
 566         res->sr_renewal_time = jiffies;
 567         res->sr_status_flags = 0;
 568         /*
 569          * sr_status is only set in decode_sequence, and so will remain
 570          * set to 1 if an rpc level failure occurs.
 571          */
 572         res->sr_status = 1;
 573         return 0;
 574 }
 575
 576 int nfs4_setup_sequence(const struct nfs_server *server,
 577                         struct nfs4_sequence_args *args,
 578                         struct nfs4_sequence_res *res,
 579                         int cache_reply,
 580                         struct rpc_task *task)
 581 {
 582         struct nfs4_session *session = nfs4_get_session(server);
 583         int ret = 0;
 584
 585         if (session == NULL) {
 586                 args->sa_session = NULL;
 587                 res->sr_session = NULL;
 588                 goto out;
 589         }
 590
 591         dprintk("--> %s clp %p session %p sr_slot %td\n",
 592                 __func__, session->clp, session, res->sr_slot ?
 593                         res->sr_slot - session->fc_slot_table.slots : -1);
 594
 595         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 596                                    task);
 597 out:
 598         dprintk("<-- %s status=%d\n", __func__, ret);
 599         return ret;
 600 }
 601
 602 struct nfs41_call_sync_data {
 603         const struct nfs_server *seq_server;
 604         struct nfs4_sequence_args *seq_args;
 605         struct nfs4_sequence_res *seq_res;
 606         int cache_reply;
 607 };
 608
 609 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 610 {
 611         struct nfs41_call_sync_data *data = calldata;
 612
 613         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 614
 615         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 616                                 data->seq_res, data->cache_reply, task))
 617                 return;
 618         rpc_call_start(task);
 619 }
 620
 621 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 622 {
 623         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 624         nfs41_call_sync_prepare(task, calldata);
 625 }
 626
 627 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 628 {
 629         struct nfs41_call_sync_data *data = calldata;
 630
 631         nfs41_sequence_done(task, data->seq_res);
 632 }
 633
 634 struct rpc_call_ops nfs41_call_sync_ops = {
 635         .rpc_call_prepare = nfs41_call_sync_prepare,
 636         .rpc_call_done = nfs41_call_sync_done,
 637 };
 638
 639 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 640         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 641         .rpc_call_done = nfs41_call_sync_done,
 642 };
 643
 644 static int nfs4_call_sync_sequence(struct nfs_server *server,
 645                                    struct rpc_message *msg,
 646                                    struct nfs4_sequence_args *args,
 647                                    struct nfs4_sequence_res *res,
 648                                    int cache_reply,
 649                                    int privileged)
 650 {
 651         int ret;
 652         struct rpc_task *task;
 653         struct nfs41_call_sync_data data = {
 654                 .seq_server = server,
 655                 .seq_args = args,
 656                 .seq_res = res,
 657                 .cache_reply = cache_reply,
 658         };
 659         struct rpc_task_setup task_setup = {
 660                 .rpc_client = server->client,
 661                 .rpc_message = msg,
 662                 .callback_ops = &nfs41_call_sync_ops,
 663                 .callback_data = &data
 664         };
 665
 666         res->sr_slot = NULL;
 667         if (privileged)
 668                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 669         task = rpc_run_task(&task_setup);
 670         if (IS_ERR(task))
 671                 ret = PTR_ERR(task);
 672         else {
 673                 ret = task->tk_status;
 674                 rpc_put_task(task);
 675         }
 676         return ret;
 677 }
 678
 679 int _nfs4_call_sync_session(struct nfs_server *server,
 680                             struct rpc_message *msg,
 681                             struct nfs4_sequence_args *args,
 682                             struct nfs4_sequence_res *res,
 683                             int cache_reply)
 684 {
 685         return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
 686 }
 687
 688 #else
 689 static int nfs4_sequence_done(struct rpc_task *task,
 690                                struct nfs4_sequence_res *res)
 691 {
 692         return 1;
 693 }
 694 #endif /* CONFIG_NFS_V4_1 */
 695
 696 int _nfs4_call_sync(struct nfs_server *server,
 697                     struct rpc_message *msg,
 698                     struct nfs4_sequence_args *args,
 699                     struct nfs4_sequence_res *res,
 700                     int cache_reply)
 701 {
 702         args->sa_session = res->sr_session = NULL;
 703         return rpc_call_sync(server->client, msg, 0);
 704 }
 705
 706 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 707         (server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
 708                         &(res)->seq_res, (cache_reply))
 709
 710 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 711 {
 712         struct nfs_inode *nfsi = NFS_I(dir);
 713
 714         spin_lock(&dir->i_lock);
 715         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 716         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 717                 nfs_force_lookup_revalidate(dir);
 718         nfsi->change_attr = cinfo->after;
 719         spin_unlock(&dir->i_lock);
 720 }
 721
 722 struct nfs4_opendata {
 723         struct kref kref;
 724         struct nfs_openargs o_arg;
 725         struct nfs_openres o_res;
 726         struct nfs_open_confirmargs c_arg;
 727         struct nfs_open_confirmres c_res;
 728         struct nfs_fattr f_attr;
 729         struct nfs_fattr dir_attr;
 730         struct path path;
 731         struct dentry *dir;
 732         struct nfs4_state_owner *owner;
 733         struct nfs4_state *state;
 734         struct iattr attrs;
 735         unsigned long timestamp;
 736         unsigned int rpc_done : 1;
 737         int rpc_status;
 738         int cancelled;
 739 };
 740
 741
 742 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 743 {
 744         p->o_res.f_attr = &p->f_attr;
 745         p->o_res.dir_attr = &p->dir_attr;
 746         p->o_res.seqid = p->o_arg.seqid;
 747         p->c_res.seqid = p->c_arg.seqid;
 748         p->o_res.server = p->o_arg.server;
 749         nfs_fattr_init(&p->f_attr);
 750         nfs_fattr_init(&p->dir_attr);
 751 }
 752
 753 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 754                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 755                 const struct iattr *attrs,
 756                 gfp_t gfp_mask)
 757 {
 758         struct dentry *parent = dget_parent(path->dentry);
 759         struct inode *dir = parent->d_inode;
 760         struct nfs_server *server = NFS_SERVER(dir);
 761         struct nfs4_opendata *p;
 762
 763         p = kzalloc(sizeof(*p), gfp_mask);
 764         if (p == NULL)
 765                 goto err;
 766         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 767         if (p->o_arg.seqid == NULL)
 768                 goto err_free;
 769         path_get(path);
 770         p->path = *path;
 771         p->dir = parent;
 772         p->owner = sp;
 773         atomic_inc(&sp->so_count);
 774         p->o_arg.fh = NFS_FH(dir);
 775         p->o_arg.open_flags = flags;
 776         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 777         p->o_arg.clientid = server->nfs_client->cl_clientid;
 778         p->o_arg.id = sp->so_owner_id.id;
 779         p->o_arg.name = &p->path.dentry->d_name;
 780         p->o_arg.server = server;
 781         p->o_arg.bitmask = server->attr_bitmask;
 782         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 783         if (flags & O_CREAT) {
 784                 u32 *s;
 785
 786                 p->o_arg.u.attrs = &p->attrs;
 787                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 788                 s = (u32 *) p->o_arg.u.verifier.data;
 789                 s[0] = jiffies;
 790                 s[1] = current->pid;
 791         }
 792         p->c_arg.fh = &p->o_res.fh;
 793         p->c_arg.stateid = &p->o_res.stateid;
 794         p->c_arg.seqid = p->o_arg.seqid;
 795         nfs4_init_opendata_res(p);
 796         kref_init(&p->kref);
 797         return p;
 798 err_free:
 799         kfree(p);
 800 err:
 801         dput(parent);
 802         return NULL;
 803 }
 804
 805 static void nfs4_opendata_free(struct kref *kref)
 806 {
 807         struct nfs4_opendata *p = container_of(kref,
 808                         struct nfs4_opendata, kref);
 809
 810         nfs_free_seqid(p->o_arg.seqid);
 811         if (p->state != NULL)
 812                 nfs4_put_open_state(p->state);
 813         nfs4_put_state_owner(p->owner);
 814         dput(p->dir);
 815         path_put(&p->path);
 816         kfree(p);
 817 }
 818
 819 static void nfs4_opendata_put(struct nfs4_opendata *p)
 820 {
 821         if (p != NULL)
 822                 kref_put(&p->kref, nfs4_opendata_free);
 823 }
 824
 825 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 826 {
 827         int ret;
 828
 829         ret = rpc_wait_for_completion_task(task);
 830         return ret;
 831 }
 832
 833 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 834 {
 835         int ret = 0;
 836
 837         if (open_mode & O_EXCL)
 838                 goto out;
 839         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 840                 case FMODE_READ:
 841                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 842                                 && state->n_rdonly != 0;
 843                         break;
 844                 case FMODE_WRITE:
 845                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 846                                 && state->n_wronly != 0;
 847                         break;
 848                 case FMODE_READ|FMODE_WRITE:
 849                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 850                                 && state->n_rdwr != 0;
 851         }
 852 out:
 853         return ret;
 854 }
 855
 856 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 857 {
 858         if ((delegation->type & fmode) != fmode)
 859                 return 0;
 860         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 861                 return 0;
 862         nfs_mark_delegation_referenced(delegation);
 863         return 1;
 864 }
 865
 866 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 867 {
 868         switch (fmode) {
 869                 case FMODE_WRITE:
 870                         state->n_wronly++;
 871                         break;
 872                 case FMODE_READ:
 873                         state->n_rdonly++;
 874                         break;
 875                 case FMODE_READ|FMODE_WRITE:
 876                         state->n_rdwr++;
 877         }
 878         nfs4_state_set_mode_locked(state, state->state | fmode);
 879 }
 880
 881 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 882 {
 883         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 884                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 885         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 886         switch (fmode) {
 887                 case FMODE_READ:
 888                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 889                         break;
 890                 case FMODE_WRITE:
 891                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 892                         break;
 893                 case FMODE_READ|FMODE_WRITE:
 894                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 895         }
 896 }
 897
 898 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 899 {
 900         write_seqlock(&state->seqlock);
 901         nfs_set_open_stateid_locked(state, stateid, fmode);
 902         write_sequnlock(&state->seqlock);
 903 }
 904
 905 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 906 {
 907         /*
 908          * Protect the call to nfs4_state_set_mode_locked and
 909          * serialise the stateid update
 910          */
 911         write_seqlock(&state->seqlock);
 912         if (deleg_stateid != NULL) {
 913                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 914                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 915         }
 916         if (open_stateid != NULL)
 917                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 918         write_sequnlock(&state->seqlock);
 919         spin_lock(&state->owner->so_lock);
 920         update_open_stateflags(state, fmode);
 921         spin_unlock(&state->owner->so_lock);
 922 }
 923
 924 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 925 {
 926         struct nfs_inode *nfsi = NFS_I(state->inode);
 927         struct nfs_delegation *deleg_cur;
 928         int ret = 0;
 929
 930         fmode &= (FMODE_READ|FMODE_WRITE);
 931
 932         rcu_read_lock();
 933         deleg_cur = rcu_dereference(nfsi->delegation);
 934         if (deleg_cur == NULL)
 935                 goto no_delegation;
 936
 937         spin_lock(&deleg_cur->lock);
 938         if (nfsi->delegation != deleg_cur ||
 939             (deleg_cur->type & fmode) != fmode)
 940                 goto no_delegation_unlock;
 941
 942         if (delegation == NULL)
 943                 delegation = &deleg_cur->stateid;
 944         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 945                 goto no_delegation_unlock;
 946
 947         nfs_mark_delegation_referenced(deleg_cur);
 948         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 949         ret = 1;
 950 no_delegation_unlock:
 951         spin_unlock(&deleg_cur->lock);
 952 no_delegation:
 953         rcu_read_unlock();
 954
 955         if (!ret && open_stateid != NULL) {
 956                 __update_open_stateid(state, open_stateid, NULL, fmode);
 957                 ret = 1;
 958         }
 959
 960         return ret;
 961 }
 962
 963
 964 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 965 {
 966         struct nfs_delegation *delegation;
 967
 968         rcu_read_lock();
 969         delegation = rcu_dereference(NFS_I(inode)->delegation);
 970         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 971                 rcu_read_unlock();
 972                 return;
 973         }
 974         rcu_read_unlock();
 975         nfs_inode_return_delegation(inode);
 976 }
 977
 978 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 979 {
 980         struct nfs4_state *state = opendata->state;
 981         struct nfs_inode *nfsi = NFS_I(state->inode);
 982         struct nfs_delegation *delegation;
 983         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 984         fmode_t fmode = opendata->o_arg.fmode;
 985         nfs4_stateid stateid;
 986         int ret = -EAGAIN;
 987
 988         for (;;) {
 989                 if (can_open_cached(state, fmode, open_mode)) {
 990                         spin_lock(&state->owner->so_lock);
 991                         if (can_open_cached(state, fmode, open_mode)) {
 992                                 update_open_stateflags(state, fmode);
 993                                 spin_unlock(&state->owner->so_lock);
 994                                 goto out_return_state;
 995                         }
 996                         spin_unlock(&state->owner->so_lock);
 997                 }
 998                 rcu_read_lock();
 999                 delegation = rcu_dereference(nfsi->delegation);
1000                 if (delegation == NULL ||
1001                     !can_open_delegated(delegation, fmode)) {
1002                         rcu_read_unlock();
1003                         break;
1004                 }
1005                 /* Save the delegation */
1006                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1007                 rcu_read_unlock();
1008                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1009                 if (ret != 0)
1010                         goto out;
1011                 ret = -EAGAIN;
1012
1013                 /* Try to update the stateid using the delegation */
1014                 if (update_open_stateid(state, NULL, &stateid, fmode))
1015                         goto out_return_state;
1016         }
1017 out:
1018         return ERR_PTR(ret);
1019 out_return_state:
1020         atomic_inc(&state->count);
1021         return state;
1022 }
1023
1024 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1025 {
1026         struct inode *inode;
1027         struct nfs4_state *state = NULL;
1028         struct nfs_delegation *delegation;
1029         int ret;
1030
1031         if (!data->rpc_done) {
1032                 state = nfs4_try_open_cached(data);
1033                 goto out;
1034         }
1035
1036         ret = -EAGAIN;
1037         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1038                 goto err;
1039         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1040         ret = PTR_ERR(inode);
1041         if (IS_ERR(inode))
1042                 goto err;
1043         ret = -ENOMEM;
1044         state = nfs4_get_open_state(inode, data->owner);
1045         if (state == NULL)
1046                 goto err_put_inode;
1047         if (data->o_res.delegation_type != 0) {
1048                 int delegation_flags = 0;
1049
1050                 rcu_read_lock();
1051                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1052                 if (delegation)
1053                         delegation_flags = delegation->flags;
1054                 rcu_read_unlock();
1055                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1056                         nfs_inode_set_delegation(state->inode,
1057                                         data->owner->so_cred,
1058                                         &data->o_res);
1059                 else
1060                         nfs_inode_reclaim_delegation(state->inode,
1061                                         data->owner->so_cred,
1062                                         &data->o_res);
1063         }
1064
1065         update_open_stateid(state, &data->o_res.stateid, NULL,
1066                         data->o_arg.fmode);
1067         iput(inode);
1068 out:
1069         return state;
1070 err_put_inode:
1071         iput(inode);
1072 err:
1073         return ERR_PTR(ret);
1074 }
1075
1076 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1077 {
1078         struct nfs_inode *nfsi = NFS_I(state->inode);
1079         struct nfs_open_context *ctx;
1080
1081         spin_lock(&state->inode->i_lock);
1082         list_for_each_entry(ctx, &nfsi->open_files, list) {
1083                 if (ctx->state != state)
1084                         continue;
1085                 get_nfs_open_context(ctx);
1086                 spin_unlock(&state->inode->i_lock);
1087                 return ctx;
1088         }
1089         spin_unlock(&state->inode->i_lock);
1090         return ERR_PTR(-ENOENT);
1091 }
1092
1093 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1094 {
1095         struct nfs4_opendata *opendata;
1096
1097         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1098         if (opendata == NULL)
1099                 return ERR_PTR(-ENOMEM);
1100         opendata->state = state;
1101         atomic_inc(&state->count);
1102         return opendata;
1103 }
1104
1105 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1106 {
1107         struct nfs4_state *newstate;
1108         int ret;
1109
1110         opendata->o_arg.open_flags = 0;
1111         opendata->o_arg.fmode = fmode;
1112         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1113         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1114         nfs4_init_opendata_res(opendata);
1115         ret = _nfs4_recover_proc_open(opendata);
1116         if (ret != 0)
1117                 return ret;
1118         newstate = nfs4_opendata_to_nfs4_state(opendata);
1119         if (IS_ERR(newstate))
1120                 return PTR_ERR(newstate);
1121         nfs4_close_state(&opendata->path, newstate, fmode);
1122         *res = newstate;
1123         return 0;
1124 }
1125
1126 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1127 {
1128         struct nfs4_state *newstate;
1129         int ret;
1130
1131         /* memory barrier prior to reading state->n_* */
1132         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1133         smp_rmb();
1134         if (state->n_rdwr != 0) {
1135                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1136                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1137                 if (ret != 0)
1138                         return ret;
1139                 if (newstate != state)
1140                         return -ESTALE;
1141         }
1142         if (state->n_wronly != 0) {
1143                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1144                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1145                 if (ret != 0)
1146                         return ret;
1147                 if (newstate != state)
1148                         return -ESTALE;
1149         }
1150         if (state->n_rdonly != 0) {
1151                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1152                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1153                 if (ret != 0)
1154                         return ret;
1155                 if (newstate != state)
1156                         return -ESTALE;
1157         }
1158         /*
1159          * We may have performed cached opens for all three recoveries.
1160          * Check if we need to update the current stateid.
1161          */
1162         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1163             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1164                 write_seqlock(&state->seqlock);
1165                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1166                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1167                 write_sequnlock(&state->seqlock);
1168         }
1169         return 0;
1170 }
1171
1172 /*
1173  * OPEN_RECLAIM:
1174  *      reclaim state on the server after a reboot.
1175  */
1176 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1177 {
1178         struct nfs_delegation *delegation;
1179         struct nfs4_opendata *opendata;
1180         fmode_t delegation_type = 0;
1181         int status;
1182
1183         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1184         if (IS_ERR(opendata))
1185                 return PTR_ERR(opendata);
1186         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1187         opendata->o_arg.fh = NFS_FH(state->inode);
1188         rcu_read_lock();
1189         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1190         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1191                 delegation_type = delegation->type;
1192         rcu_read_unlock();
1193         opendata->o_arg.u.delegation_type = delegation_type;
1194         status = nfs4_open_recover(opendata, state);
1195         nfs4_opendata_put(opendata);
1196         return status;
1197 }
1198
1199 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1200 {
1201         struct nfs_server *server = NFS_SERVER(state->inode);
1202         struct nfs4_exception exception = { };
1203         int err;
1204         do {
1205                 err = _nfs4_do_open_reclaim(ctx, state);
1206                 if (err != -NFS4ERR_DELAY)
1207                         break;
1208                 nfs4_handle_exception(server, err, &exception);
1209         } while (exception.retry);
1210         return err;
1211 }
1212
1213 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1214 {
1215         struct nfs_open_context *ctx;
1216         int ret;
1217
1218         ctx = nfs4_state_find_open_context(state);
1219         if (IS_ERR(ctx))
1220                 return PTR_ERR(ctx);
1221         ret = nfs4_do_open_reclaim(ctx, state);
1222         put_nfs_open_context(ctx);
1223         return ret;
1224 }
1225
1226 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1227 {
1228         struct nfs4_opendata *opendata;
1229         int ret;
1230
1231         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1232         if (IS_ERR(opendata))
1233                 return PTR_ERR(opendata);
1234         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1235         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1236                         sizeof(opendata->o_arg.u.delegation.data));
1237         ret = nfs4_open_recover(opendata, state);
1238         nfs4_opendata_put(opendata);
1239         return ret;
1240 }
1241
1242 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1243 {
1244         struct nfs4_exception exception = { };
1245         struct nfs_server *server = NFS_SERVER(state->inode);
1246         int err;
1247         do {
1248                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1249                 switch (err) {
1250                         case 0:
1251                         case -ENOENT:
1252                         case -ESTALE:
1253                                 goto out;
1254                         case -NFS4ERR_BADSESSION:
1255                         case -NFS4ERR_BADSLOT:
1256                         case -NFS4ERR_BAD_HIGH_SLOT:
1257                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1258                         case -NFS4ERR_DEADSESSION:
1259                                 nfs4_schedule_state_recovery(
1260                                         server->nfs_client);
1261                                 goto out;
1262                         case -NFS4ERR_STALE_CLIENTID:
1263                         case -NFS4ERR_STALE_STATEID:
1264                         case -NFS4ERR_EXPIRED:
1265                                 /* Don't recall a delegation if it was lost */
1266                                 nfs4_schedule_state_recovery(server->nfs_client);
1267                                 goto out;
1268                         case -ERESTARTSYS:
1269                                 /*
1270                                  * The show must go on: exit, but mark the
1271                                  * stateid as needing recovery.
1272                                  */
1273                         case -NFS4ERR_ADMIN_REVOKED:
1274                         case -NFS4ERR_BAD_STATEID:
1275                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1276                         case -EKEYEXPIRED:
1277                                 /*
1278                                  * User RPCSEC_GSS context has expired.
1279                                  * We cannot recover this stateid now, so
1280                                  * skip it and allow recovery thread to
1281                                  * proceed.
1282                                  */
1283                         case -ENOMEM:
1284                                 err = 0;
1285                                 goto out;
1286                 }
1287                 err = nfs4_handle_exception(server, err, &exception);
1288         } while (exception.retry);
1289 out:
1290         return err;
1291 }
1292
1293 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1294 {
1295         struct nfs4_opendata *data = calldata;
1296
1297         data->rpc_status = task->tk_status;
1298         if (data->rpc_status == 0) {
1299                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1300                                 sizeof(data->o_res.stateid.data));
1301                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1302                 renew_lease(data->o_res.server, data->timestamp);
1303                 data->rpc_done = 1;
1304         }
1305 }
1306
1307 static void nfs4_open_confirm_release(void *calldata)
1308 {
1309         struct nfs4_opendata *data = calldata;
1310         struct nfs4_state *state = NULL;
1311
1312         /* If this request hasn't been cancelled, do nothing */
1313         if (data->cancelled == 0)
1314                 goto out_free;
1315         /* In case of error, no cleanup! */
1316         if (!data->rpc_done)
1317                 goto out_free;
1318         state = nfs4_opendata_to_nfs4_state(data);
1319         if (!IS_ERR(state))
1320                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1321 out_free:
1322         nfs4_opendata_put(data);
1323 }
1324
1325 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1326         .rpc_call_done = nfs4_open_confirm_done,
1327         .rpc_release = nfs4_open_confirm_release,
1328 };
1329
1330 /*
1331  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1332  */
1333 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1334 {
1335         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1336         struct rpc_task *task;
1337         struct  rpc_message msg = {
1338                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1339                 .rpc_argp = &data->c_arg,
1340                 .rpc_resp = &data->c_res,
1341                 .rpc_cred = data->owner->so_cred,
1342         };
1343         struct rpc_task_setup task_setup_data = {
1344                 .rpc_client = server->client,
1345                 .rpc_message = &msg,
1346                 .callback_ops = &nfs4_open_confirm_ops,
1347                 .callback_data = data,
1348                 .workqueue = nfsiod_workqueue,
1349                 .flags = RPC_TASK_ASYNC,
1350         };
1351         int status;
1352
1353         kref_get(&data->kref);
1354         data->rpc_done = 0;
1355         data->rpc_status = 0;
1356         data->timestamp = jiffies;
1357         task = rpc_run_task(&task_setup_data);
1358         if (IS_ERR(task))
1359                 return PTR_ERR(task);
1360         status = nfs4_wait_for_completion_rpc_task(task);
1361         if (status != 0) {
1362                 data->cancelled = 1;
1363                 smp_wmb();
1364         } else
1365                 status = data->rpc_status;
1366         rpc_put_task(task);
1367         return status;
1368 }
1369
1370 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1371 {
1372         struct nfs4_opendata *data = calldata;
1373         struct nfs4_state_owner *sp = data->owner;
1374
1375         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1376                 return;
1377         /*
1378          * Check if we still need to send an OPEN call, or if we can use
1379          * a delegation instead.
1380          */
1381         if (data->state != NULL) {
1382                 struct nfs_delegation *delegation;
1383
1384                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1385                         goto out_no_action;
1386                 rcu_read_lock();
1387                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1388                 if (delegation != NULL &&
1389                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1390                         rcu_read_unlock();
1391                         goto out_no_action;
1392                 }
1393                 rcu_read_unlock();
1394         }
1395         /* Update sequence id. */
1396         data->o_arg.id = sp->so_owner_id.id;
1397         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1398         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1399                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1400                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1401         }
1402         data->timestamp = jiffies;
1403         if (nfs4_setup_sequence(data->o_arg.server,
1404                                 &data->o_arg.seq_args,
1405                                 &data->o_res.seq_res, 1, task))
1406                 return;
1407         rpc_call_start(task);
1408         return;
1409 out_no_action:
1410         task->tk_action = NULL;
1411
1412 }
1413
1414 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1415 {
1416         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1417         nfs4_open_prepare(task, calldata);
1418 }
1419
1420 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1421 {
1422         struct nfs4_opendata *data = calldata;
1423
1424         data->rpc_status = task->tk_status;
1425
1426         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1427                 return;
1428
1429         if (task->tk_status == 0) {
1430                 switch (data->o_res.f_attr->mode & S_IFMT) {
1431                         case S_IFREG:
1432                                 break;
1433                         case S_IFLNK:
1434                                 data->rpc_status = -ELOOP;
1435                                 break;
1436                         case S_IFDIR:
1437                                 data->rpc_status = -EISDIR;
1438                                 break;
1439                         default:
1440                                 data->rpc_status = -ENOTDIR;
1441                 }
1442                 renew_lease(data->o_res.server, data->timestamp);
1443                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1444                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1445         }
1446         data->rpc_done = 1;
1447 }
1448
1449 static void nfs4_open_release(void *calldata)
1450 {
1451         struct nfs4_opendata *data = calldata;
1452         struct nfs4_state *state = NULL;
1453
1454         /* If this request hasn't been cancelled, do nothing */
1455         if (data->cancelled == 0)
1456                 goto out_free;
1457         /* In case of error, no cleanup! */
1458         if (data->rpc_status != 0 || !data->rpc_done)
1459                 goto out_free;
1460         /* In case we need an open_confirm, no cleanup! */
1461         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1462                 goto out_free;
1463         state = nfs4_opendata_to_nfs4_state(data);
1464         if (!IS_ERR(state))
1465                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1466 out_free:
1467         nfs4_opendata_put(data);
1468 }
1469
1470 static const struct rpc_call_ops nfs4_open_ops = {
1471         .rpc_call_prepare = nfs4_open_prepare,
1472         .rpc_call_done = nfs4_open_done,
1473         .rpc_release = nfs4_open_release,
1474 };
1475
1476 static const struct rpc_call_ops nfs4_recover_open_ops = {
1477         .rpc_call_prepare = nfs4_recover_open_prepare,
1478         .rpc_call_done = nfs4_open_done,
1479         .rpc_release = nfs4_open_release,
1480 };
1481
1482 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1483 {
1484         struct inode *dir = data->dir->d_inode;
1485         struct nfs_server *server = NFS_SERVER(dir);
1486         struct nfs_openargs *o_arg = &data->o_arg;
1487         struct nfs_openres *o_res = &data->o_res;
1488         struct rpc_task *task;
1489         struct rpc_message msg = {
1490                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1491                 .rpc_argp = o_arg,
1492                 .rpc_resp = o_res,
1493                 .rpc_cred = data->owner->so_cred,
1494         };
1495         struct rpc_task_setup task_setup_data = {
1496                 .rpc_client = server->client,
1497                 .rpc_message = &msg,
1498                 .callback_ops = &nfs4_open_ops,
1499                 .callback_data = data,
1500                 .workqueue = nfsiod_workqueue,
1501                 .flags = RPC_TASK_ASYNC,
1502         };
1503         int status;
1504
1505         kref_get(&data->kref);
1506         data->rpc_done = 0;
1507         data->rpc_status = 0;
1508         data->cancelled = 0;
1509         if (isrecover)
1510                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1511         task = rpc_run_task(&task_setup_data);
1512         if (IS_ERR(task))
1513                 return PTR_ERR(task);
1514         status = nfs4_wait_for_completion_rpc_task(task);
1515         if (status != 0) {
1516                 data->cancelled = 1;
1517                 smp_wmb();
1518         } else
1519                 status = data->rpc_status;
1520         rpc_put_task(task);
1521
1522         return status;
1523 }
1524
1525 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1526 {
1527         struct inode *dir = data->dir->d_inode;
1528         struct nfs_openres *o_res = &data->o_res;
1529         int status;
1530
1531         status = nfs4_run_open_task(data, 1);
1532         if (status != 0 || !data->rpc_done)
1533                 return status;
1534
1535         nfs_refresh_inode(dir, o_res->dir_attr);
1536
1537         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1538                 status = _nfs4_proc_open_confirm(data);
1539                 if (status != 0)
1540                         return status;
1541         }
1542
1543         return status;
1544 }
1545
1546 /*
1547  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1548  */
1549 static int _nfs4_proc_open(struct nfs4_opendata *data)
1550 {
1551         struct inode *dir = data->dir->d_inode;
1552         struct nfs_server *server = NFS_SERVER(dir);
1553         struct nfs_openargs *o_arg = &data->o_arg;
1554         struct nfs_openres *o_res = &data->o_res;
1555         int status;
1556
1557         status = nfs4_run_open_task(data, 0);
1558         if (status != 0 || !data->rpc_done)
1559                 return status;
1560
1561         if (o_arg->open_flags & O_CREAT) {
1562                 update_changeattr(dir, &o_res->cinfo);
1563                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1564         } else
1565                 nfs_refresh_inode(dir, o_res->dir_attr);
1566         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1567                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1568         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1569                 status = _nfs4_proc_open_confirm(data);
1570                 if (status != 0)
1571                         return status;
1572         }
1573         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1574                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1575         return 0;
1576 }
1577
1578 static int nfs4_recover_expired_lease(struct nfs_server *server)
1579 {
1580         struct nfs_client *clp = server->nfs_client;
1581         unsigned int loop;
1582         int ret;
1583
1584         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1585                 ret = nfs4_wait_clnt_recover(clp);
1586                 if (ret != 0)
1587                         break;
1588                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1589                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1590                         break;
1591                 nfs4_schedule_state_recovery(clp);
1592                 ret = -EIO;
1593         }
1594         return ret;
1595 }
1596
1597 /*
1598  * OPEN_EXPIRED:
1599  *      reclaim state on the server after a network partition.
1600  *      Assumes caller holds the appropriate lock
1601  */
1602 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1603 {
1604         struct nfs4_opendata *opendata;
1605         int ret;
1606
1607         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1608         if (IS_ERR(opendata))
1609                 return PTR_ERR(opendata);
1610         ret = nfs4_open_recover(opendata, state);
1611         if (ret == -ESTALE)
1612                 d_drop(ctx->path.dentry);
1613         nfs4_opendata_put(opendata);
1614         return ret;
1615 }
1616
1617 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1618 {
1619         struct nfs_server *server = NFS_SERVER(state->inode);
1620         struct nfs4_exception exception = { };
1621         int err;
1622
1623         do {
1624                 err = _nfs4_open_expired(ctx, state);
1625                 switch (err) {
1626                 default:
1627                         goto out;
1628                 case -NFS4ERR_GRACE:
1629                 case -NFS4ERR_DELAY:
1630                         nfs4_handle_exception(server, err, &exception);
1631                         err = 0;
1632                 }
1633         } while (exception.retry);
1634 out:
1635         return err;
1636 }
1637
1638 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1639 {
1640         struct nfs_open_context *ctx;
1641         int ret;
1642
1643         ctx = nfs4_state_find_open_context(state);
1644         if (IS_ERR(ctx))
1645                 return PTR_ERR(ctx);
1646         ret = nfs4_do_open_expired(ctx, state);
1647         put_nfs_open_context(ctx);
1648         return ret;
1649 }
1650
1651 /*
1652  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1653  * fields corresponding to attributes that were used to store the verifier.
1654  * Make sure we clobber those fields in the later setattr call
1655  */
1656 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1657 {
1658         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1659             !(sattr->ia_valid & ATTR_ATIME_SET))
1660                 sattr->ia_valid |= ATTR_ATIME;
1661
1662         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1663             !(sattr->ia_valid & ATTR_MTIME_SET))
1664                 sattr->ia_valid |= ATTR_MTIME;
1665 }
1666
1667 /*
1668  * Returns a referenced nfs4_state
1669  */
1670 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)
1671 {
1672         struct nfs4_state_owner  *sp;
1673         struct nfs4_state     *state = NULL;
1674         struct nfs_server       *server = NFS_SERVER(dir);
1675         struct nfs4_opendata *opendata;
1676         int status;
1677
1678         /* Protect against reboot recovery conflicts */
1679         status = -ENOMEM;
1680         if (!(sp = nfs4_get_state_owner(server, cred))) {
1681                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1682                 goto out_err;
1683         }
1684         status = nfs4_recover_expired_lease(server);
1685         if (status != 0)
1686                 goto err_put_state_owner;
1687         if (path->dentry->d_inode != NULL)
1688                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1689         status = -ENOMEM;
1690         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1691         if (opendata == NULL)
1692                 goto err_put_state_owner;
1693
1694         if (path->dentry->d_inode != NULL)
1695                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1696
1697         status = _nfs4_proc_open(opendata);
1698         if (status != 0)
1699                 goto err_opendata_put;
1700
1701         state = nfs4_opendata_to_nfs4_state(opendata);
1702         status = PTR_ERR(state);
1703         if (IS_ERR(state))
1704                 goto err_opendata_put;
1705         if (server->caps & NFS_CAP_POSIX_LOCK)
1706                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1707
1708         if (opendata->o_arg.open_flags & O_EXCL) {
1709                 nfs4_exclusive_attrset(opendata, sattr);
1710
1711                 nfs_fattr_init(opendata->o_res.f_attr);
1712                 status = nfs4_do_setattr(state->inode, cred,
1713                                 opendata->o_res.f_attr, sattr,
1714                                 state);
1715                 if (status == 0)
1716                         nfs_setattr_update_inode(state->inode, sattr);
1717                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1718         }
1719         nfs4_opendata_put(opendata);
1720         nfs4_put_state_owner(sp);
1721         *res = state;
1722         return 0;
1723 err_opendata_put:
1724         nfs4_opendata_put(opendata);
1725 err_put_state_owner:
1726         nfs4_put_state_owner(sp);
1727 out_err:
1728         *res = NULL;
1729         return status;
1730 }
1731
1732
1733 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)
1734 {
1735         struct nfs4_exception exception = { };
1736         struct nfs4_state *res;
1737         int status;
1738
1739         do {
1740                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1741                 if (status == 0)
1742                         break;
1743                 /* NOTE: BAD_SEQID means the server and client disagree about the
1744                  * book-keeping w.r.t. state-changing operations
1745                  * (OPEN/CLOSE/LOCK/LOCKU...)
1746                  * It is actually a sign of a bug on the client or on the server.
1747                  *
1748                  * If we receive a BAD_SEQID error in the particular case of
1749                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1750                  * have unhashed the old state_owner for us, and that we can
1751                  * therefore safely retry using a new one. We should still warn
1752                  * the user though...
1753                  */
1754                 if (status == -NFS4ERR_BAD_SEQID) {
1755                         printk(KERN_WARNING "NFS: v4 server %s "
1756                                         " returned a bad sequence-id error!\n",
1757                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1758                         exception.retry = 1;
1759                         continue;
1760                 }
1761                 /*
1762                  * BAD_STATEID on OPEN means that the server cancelled our
1763                  * state before it received the OPEN_CONFIRM.
1764                  * Recover by retrying the request as per the discussion
1765                  * on Page 181 of RFC3530.
1766                  */
1767                 if (status == -NFS4ERR_BAD_STATEID) {
1768                         exception.retry = 1;
1769                         continue;
1770                 }
1771                 if (status == -EAGAIN) {
1772                         /* We must have found a delegation */
1773                         exception.retry = 1;
1774                         continue;
1775                 }
1776                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1777                                         status, &exception));
1778         } while (exception.retry);
1779         return res;
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 nfs_setattrargs  arg = {
1788                 .fh             = NFS_FH(inode),
1789                 .iap            = sattr,
1790                 .server         = server,
1791                 .bitmask = server->attr_bitmask,
1792         };
1793         struct nfs_setattrres  res = {
1794                 .fattr          = fattr,
1795                 .server         = server,
1796         };
1797         struct rpc_message msg = {
1798                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1799                 .rpc_argp       = &arg,
1800                 .rpc_resp       = &res,
1801                 .rpc_cred       = cred,
1802         };
1803         unsigned long timestamp = jiffies;
1804         int status;
1805
1806         nfs_fattr_init(fattr);
1807
1808         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1809                 /* Use that stateid */
1810         } else if (state != NULL) {
1811                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1812         } else
1813                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1814
1815         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1816         if (status == 0 && state != NULL)
1817                 renew_lease(server, timestamp);
1818         return status;
1819 }
1820
1821 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1822                            struct nfs_fattr *fattr, struct iattr *sattr,
1823                            struct nfs4_state *state)
1824 {
1825         struct nfs_server *server = NFS_SERVER(inode);
1826         struct nfs4_exception exception = { };
1827         int err;
1828         do {
1829                 err = nfs4_handle_exception(server,
1830                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1831                                 &exception);
1832         } while (exception.retry);
1833         return err;
1834 }
1835
1836 struct nfs4_closedata {
1837         struct path path;
1838         struct inode *inode;
1839         struct nfs4_state *state;
1840         struct nfs_closeargs arg;
1841         struct nfs_closeres res;
1842         struct nfs_fattr fattr;
1843         unsigned long timestamp;
1844         bool roc;
1845         u32 roc_barrier;
1846 };
1847
1848 static void nfs4_free_closedata(void *data)
1849 {
1850         struct nfs4_closedata *calldata = data;
1851         struct nfs4_state_owner *sp = calldata->state->owner;
1852
1853         if (calldata->roc)
1854                 pnfs_roc_release(calldata->state->inode);
1855         nfs4_put_open_state(calldata->state);
1856         nfs_free_seqid(calldata->arg.seqid);
1857         nfs4_put_state_owner(sp);
1858         path_put(&calldata->path);
1859         kfree(calldata);
1860 }
1861
1862 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1863                 fmode_t fmode)
1864 {
1865         spin_lock(&state->owner->so_lock);
1866         if (!(fmode & FMODE_READ))
1867                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1868         if (!(fmode & FMODE_WRITE))
1869                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1870         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1871         spin_unlock(&state->owner->so_lock);
1872 }
1873
1874 static void nfs4_close_done(struct rpc_task *task, void *data)
1875 {
1876         struct nfs4_closedata *calldata = data;
1877         struct nfs4_state *state = calldata->state;
1878         struct nfs_server *server = NFS_SERVER(calldata->inode);
1879
1880         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1881                 return;
1882         /* hmm. we are done with the inode, and in the process of freeing
1883          * the state_owner. we keep this around to process errors
1884          */
1885         switch (task->tk_status) {
1886                 case 0:
1887                         if (calldata->roc)
1888                                 pnfs_roc_set_barrier(state->inode,
1889                                                      calldata->roc_barrier);
1890                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1891                         renew_lease(server, calldata->timestamp);
1892                         nfs4_close_clear_stateid_flags(state,
1893                                         calldata->arg.fmode);
1894                         break;
1895                 case -NFS4ERR_STALE_STATEID:
1896                 case -NFS4ERR_OLD_STATEID:
1897                 case -NFS4ERR_BAD_STATEID:
1898                 case -NFS4ERR_EXPIRED:
1899                         if (calldata->arg.fmode == 0)
1900                                 break;
1901                 default:
1902                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1903                                 rpc_restart_call_prepare(task);
1904         }
1905         nfs_release_seqid(calldata->arg.seqid);
1906         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1907 }
1908
1909 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1910 {
1911         struct nfs4_closedata *calldata = data;
1912         struct nfs4_state *state = calldata->state;
1913         int call_close = 0;
1914
1915         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1916                 return;
1917
1918         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1919         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1920         spin_lock(&state->owner->so_lock);
1921         /* Calculate the change in open mode */
1922         if (state->n_rdwr == 0) {
1923                 if (state->n_rdonly == 0) {
1924                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1925                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1926                         calldata->arg.fmode &= ~FMODE_READ;
1927                 }
1928                 if (state->n_wronly == 0) {
1929                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1930                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1931                         calldata->arg.fmode &= ~FMODE_WRITE;
1932                 }
1933         }
1934         spin_unlock(&state->owner->so_lock);
1935
1936         if (!call_close) {
1937                 /* Note: exit _without_ calling nfs4_close_done */
1938                 task->tk_action = NULL;
1939                 return;
1940         }
1941
1942         if (calldata->arg.fmode == 0) {
1943                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1944                 if (calldata->roc &&
1945                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
1946                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
1947                                      task, NULL);
1948                         return;
1949                 }
1950         }
1951
1952         nfs_fattr_init(calldata->res.fattr);
1953         calldata->timestamp = jiffies;
1954         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1955                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1956                                 1, task))
1957                 return;
1958         rpc_call_start(task);
1959 }
1960
1961 static const struct rpc_call_ops nfs4_close_ops = {
1962         .rpc_call_prepare = nfs4_close_prepare,
1963         .rpc_call_done = nfs4_close_done,
1964         .rpc_release = nfs4_free_closedata,
1965 };
1966
1967 /*
1968  * It is possible for data to be read/written from a mem-mapped file
1969  * after the sys_close call (which hits the vfs layer as a flush).
1970  * This means that we can't safely call nfsv4 close on a file until
1971  * the inode is cleared. This in turn means that we are not good
1972  * NFSv4 citizens - we do not indicate to the server to update the file's
1973  * share state even when we are done with one of the three share
1974  * stateid's in the inode.
1975  *
1976  * NOTE: Caller must be holding the sp->so_owner semaphore!
1977  */
1978 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
1979 {
1980         struct nfs_server *server = NFS_SERVER(state->inode);
1981         struct nfs4_closedata *calldata;
1982         struct nfs4_state_owner *sp = state->owner;
1983         struct rpc_task *task;
1984         struct rpc_message msg = {
1985                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1986                 .rpc_cred = state->owner->so_cred,
1987         };
1988         struct rpc_task_setup task_setup_data = {
1989                 .rpc_client = server->client,
1990                 .rpc_message = &msg,
1991                 .callback_ops = &nfs4_close_ops,
1992                 .workqueue = nfsiod_workqueue,
1993                 .flags = RPC_TASK_ASYNC,
1994         };
1995         int status = -ENOMEM;
1996
1997         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1998         if (calldata == NULL)
1999                 goto out;
2000         calldata->inode = state->inode;
2001         calldata->state = state;
2002         calldata->arg.fh = NFS_FH(state->inode);
2003         calldata->arg.stateid = &state->open_stateid;
2004         /* Serialization for the sequence id */
2005         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2006         if (calldata->arg.seqid == NULL)
2007                 goto out_free_calldata;
2008         calldata->arg.fmode = 0;
2009         calldata->arg.bitmask = server->cache_consistency_bitmask;
2010         calldata->res.fattr = &calldata->fattr;
2011         calldata->res.seqid = calldata->arg.seqid;
2012         calldata->res.server = server;
2013         calldata->roc = roc;
2014         path_get(path);
2015         calldata->path = *path;
2016
2017         msg.rpc_argp = &calldata->arg;
2018         msg.rpc_resp = &calldata->res;
2019         task_setup_data.callback_data = calldata;
2020         task = rpc_run_task(&task_setup_data);
2021         if (IS_ERR(task))
2022                 return PTR_ERR(task);
2023         status = 0;
2024         if (wait)
2025                 status = rpc_wait_for_completion_task(task);
2026         rpc_put_task(task);
2027         return status;
2028 out_free_calldata:
2029         kfree(calldata);
2030 out:
2031         if (roc)
2032                 pnfs_roc_release(state->inode);
2033         nfs4_put_open_state(state);
2034         nfs4_put_state_owner(sp);
2035         return status;
2036 }
2037
2038 static struct inode *
2039 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2040 {
2041         struct nfs4_state *state;
2042
2043         /* Protect against concurrent sillydeletes */
2044         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2045         if (IS_ERR(state))
2046                 return ERR_CAST(state);
2047         ctx->state = state;
2048         return igrab(state->inode);
2049 }
2050
2051 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2052 {
2053         if (ctx->state == NULL)
2054                 return;
2055         if (is_sync)
2056                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2057         else
2058                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2059 }
2060
2061 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2062 {
2063         struct nfs4_server_caps_arg args = {
2064                 .fhandle = fhandle,
2065         };
2066         struct nfs4_server_caps_res res = {};
2067         struct rpc_message msg = {
2068                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2069                 .rpc_argp = &args,
2070                 .rpc_resp = &res,
2071         };
2072         int status;
2073
2074         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2075         if (status == 0) {
2076                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2077                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2078                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2079                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2080                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2081                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2082                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2083                         server->caps |= NFS_CAP_ACLS;
2084                 if (res.has_links != 0)
2085                         server->caps |= NFS_CAP_HARDLINKS;
2086                 if (res.has_symlinks != 0)
2087                         server->caps |= NFS_CAP_SYMLINKS;
2088                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2089                         server->caps |= NFS_CAP_FILEID;
2090                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2091                         server->caps |= NFS_CAP_MODE;
2092                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2093                         server->caps |= NFS_CAP_NLINK;
2094                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2095                         server->caps |= NFS_CAP_OWNER;
2096                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2097                         server->caps |= NFS_CAP_OWNER_GROUP;
2098                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2099                         server->caps |= NFS_CAP_ATIME;
2100                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2101                         server->caps |= NFS_CAP_CTIME;
2102                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2103                         server->caps |= NFS_CAP_MTIME;
2104
2105                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2106                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2107                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2108                 server->acl_bitmask = res.acl_bitmask;
2109         }
2110
2111         return status;
2112 }
2113
2114 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2115 {
2116         struct nfs4_exception exception = { };
2117         int err;
2118         do {
2119                 err = nfs4_handle_exception(server,
2120                                 _nfs4_server_capabilities(server, fhandle),
2121                                 &exception);
2122         } while (exception.retry);
2123         return err;
2124 }
2125
2126 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2127                 struct nfs_fsinfo *info)
2128 {
2129         struct nfs4_lookup_root_arg args = {
2130                 .bitmask = nfs4_fattr_bitmap,
2131         };
2132         struct nfs4_lookup_res res = {
2133                 .server = server,
2134                 .fattr = info->fattr,
2135                 .fh = fhandle,
2136         };
2137         struct rpc_message msg = {
2138                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2139                 .rpc_argp = &args,
2140                 .rpc_resp = &res,
2141         };
2142
2143         nfs_fattr_init(info->fattr);
2144         return nfs4_call_sync(server, &msg, &args, &res, 0);
2145 }
2146
2147 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2148                 struct nfs_fsinfo *info)
2149 {
2150         struct nfs4_exception exception = { };
2151         int err;
2152         do {
2153                 err = nfs4_handle_exception(server,
2154                                 _nfs4_lookup_root(server, fhandle, info),
2155                                 &exception);
2156         } while (exception.retry);
2157         return err;
2158 }
2159
2160 /*
2161  * get the file handle for the "/" directory on the server
2162  */
2163 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2164                               struct nfs_fsinfo *info)
2165 {
2166         int status;
2167
2168         status = nfs4_lookup_root(server, fhandle, info);
2169         if (status == 0)
2170                 status = nfs4_server_capabilities(server, fhandle);
2171         if (status == 0)
2172                 status = nfs4_do_fsinfo(server, fhandle, info);
2173         return nfs4_map_errors(status);
2174 }
2175
2176 /*
2177  * Get locations and (maybe) other attributes of a referral.
2178  * Note that we'll actually follow the referral later when
2179  * we detect fsid mismatch in inode revalidation
2180  */
2181 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2182 {
2183         int status = -ENOMEM;
2184         struct page *page = NULL;
2185         struct nfs4_fs_locations *locations = NULL;
2186
2187         page = alloc_page(GFP_KERNEL);
2188         if (page == NULL)
2189                 goto out;
2190         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2191         if (locations == NULL)
2192                 goto out;
2193
2194         status = nfs4_proc_fs_locations(dir, name, locations, page);
2195         if (status != 0)
2196                 goto out;
2197         /* Make sure server returned a different fsid for the referral */
2198         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2199                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2200                 status = -EIO;
2201                 goto out;
2202         }
2203
2204         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2205         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2206         if (!fattr->mode)
2207                 fattr->mode = S_IFDIR;
2208         memset(fhandle, 0, sizeof(struct nfs_fh));
2209 out:
2210         if (page)
2211                 __free_page(page);
2212         kfree(locations);
2213         return status;
2214 }
2215
2216 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2217 {
2218         struct nfs4_getattr_arg args = {
2219                 .fh = fhandle,
2220                 .bitmask = server->attr_bitmask,
2221         };
2222         struct nfs4_getattr_res res = {
2223                 .fattr = fattr,
2224                 .server = server,
2225         };
2226         struct rpc_message msg = {
2227                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2228                 .rpc_argp = &args,
2229                 .rpc_resp = &res,
2230         };
2231
2232         nfs_fattr_init(fattr);
2233         return nfs4_call_sync(server, &msg, &args, &res, 0);
2234 }
2235
2236 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2237 {
2238         struct nfs4_exception exception = { };
2239         int err;
2240         do {
2241                 err = nfs4_handle_exception(server,
2242                                 _nfs4_proc_getattr(server, fhandle, fattr),
2243                                 &exception);
2244         } while (exception.retry);
2245         return err;
2246 }
2247
2248 /*
2249  * The file is not closed if it is opened due to the a request to change
2250  * the size of the file. The open call will not be needed once the
2251  * VFS layer lookup-intents are implemented.
2252  *
2253  * Close is called when the inode is destroyed.
2254  * If we haven't opened the file for O_WRONLY, we
2255  * need to in the size_change case to obtain a stateid.
2256  *
2257  * Got race?
2258  * Because OPEN is always done by name in nfsv4, it is
2259  * possible that we opened a different file by the same
2260  * name.  We can recognize this race condition, but we
2261  * can't do anything about it besides returning an error.
2262  *
2263  * This will be fixed with VFS changes (lookup-intent).
2264  */
2265 static int
2266 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2267                   struct iattr *sattr)
2268 {
2269         struct inode *inode = dentry->d_inode;
2270         struct rpc_cred *cred = NULL;
2271         struct nfs4_state *state = NULL;
2272         int status;
2273
2274         nfs_fattr_init(fattr);
2275
2276         /* Search for an existing open(O_WRITE) file */
2277         if (sattr->ia_valid & ATTR_FILE) {
2278                 struct nfs_open_context *ctx;
2279
2280                 ctx = nfs_file_open_context(sattr->ia_file);
2281                 if (ctx) {
2282                         cred = ctx->cred;
2283                         state = ctx->state;
2284                 }
2285         }
2286
2287         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2288         if (status == 0)
2289                 nfs_setattr_update_inode(inode, sattr);
2290         return status;
2291 }
2292
2293 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2294                 const struct qstr *name, struct nfs_fh *fhandle,
2295                 struct nfs_fattr *fattr)
2296 {
2297         int                    status;
2298         struct nfs4_lookup_arg args = {
2299                 .bitmask = server->attr_bitmask,
2300                 .dir_fh = dirfh,
2301                 .name = name,
2302         };
2303         struct nfs4_lookup_res res = {
2304                 .server = server,
2305                 .fattr = fattr,
2306                 .fh = fhandle,
2307         };
2308         struct rpc_message msg = {
2309                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2310                 .rpc_argp = &args,
2311                 .rpc_resp = &res,
2312         };
2313
2314         nfs_fattr_init(fattr);
2315
2316         dprintk("NFS call  lookupfh %s\n", name->name);
2317         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2318         dprintk("NFS reply lookupfh: %d\n", status);
2319         return status;
2320 }
2321
2322 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2323                               struct qstr *name, struct nfs_fh *fhandle,
2324                               struct nfs_fattr *fattr)
2325 {
2326         struct nfs4_exception exception = { };
2327         int err;
2328         do {
2329                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2330                 /* FIXME: !!!! */
2331                 if (err == -NFS4ERR_MOVED) {
2332                         err = -EREMOTE;
2333                         break;
2334                 }
2335                 err = nfs4_handle_exception(server, err, &exception);
2336         } while (exception.retry);
2337         return err;
2338 }
2339
2340 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2341                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2342 {
2343         int status;
2344
2345         dprintk("NFS call  lookup %s\n", name->name);
2346         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2347         if (status == -NFS4ERR_MOVED)
2348                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2349         dprintk("NFS reply lookup: %d\n", status);
2350         return status;
2351 }
2352
2353 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2354 {
2355         struct nfs4_exception exception = { };
2356         int err;
2357         do {
2358                 err = nfs4_handle_exception(NFS_SERVER(dir),
2359                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2360                                 &exception);
2361         } while (exception.retry);
2362         return err;
2363 }
2364
2365 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2366 {
2367         struct nfs_server *server = NFS_SERVER(inode);
2368         struct nfs4_accessargs args = {
2369                 .fh = NFS_FH(inode),
2370                 .bitmask = server->attr_bitmask,
2371         };
2372         struct nfs4_accessres res = {
2373                 .server = server,
2374         };
2375         struct rpc_message msg = {
2376                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2377                 .rpc_argp = &args,
2378                 .rpc_resp = &res,
2379                 .rpc_cred = entry->cred,
2380         };
2381         int mode = entry->mask;
2382         int status;
2383
2384         /*
2385          * Determine which access bits we want to ask for...
2386          */
2387         if (mode & MAY_READ)
2388                 args.access |= NFS4_ACCESS_READ;
2389         if (S_ISDIR(inode->i_mode)) {
2390                 if (mode & MAY_WRITE)
2391                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2392                 if (mode & MAY_EXEC)
2393                         args.access |= NFS4_ACCESS_LOOKUP;
2394         } else {
2395                 if (mode & MAY_WRITE)
2396                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2397                 if (mode & MAY_EXEC)
2398                         args.access |= NFS4_ACCESS_EXECUTE;
2399         }
2400
2401         res.fattr = nfs_alloc_fattr();
2402         if (res.fattr == NULL)
2403                 return -ENOMEM;
2404
2405         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2406         if (!status) {
2407                 entry->mask = 0;
2408                 if (res.access & NFS4_ACCESS_READ)
2409                         entry->mask |= MAY_READ;
2410                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2411                         entry->mask |= MAY_WRITE;
2412                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2413                         entry->mask |= MAY_EXEC;
2414                 nfs_refresh_inode(inode, res.fattr);
2415         }
2416         nfs_free_fattr(res.fattr);
2417         return status;
2418 }
2419
2420 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2421 {
2422         struct nfs4_exception exception = { };
2423         int err;
2424         do {
2425                 err = nfs4_handle_exception(NFS_SERVER(inode),
2426                                 _nfs4_proc_access(inode, entry),
2427                                 &exception);
2428         } while (exception.retry);
2429         return err;
2430 }
2431
2432 /*
2433  * TODO: For the time being, we don't try to get any attributes
2434  * along with any of the zero-copy operations READ, READDIR,
2435  * READLINK, WRITE.
2436  *
2437  * In the case of the first three, we want to put the GETATTR
2438  * after the read-type operation -- this is because it is hard
2439  * to predict the length of a GETATTR response in v4, and thus
2440  * align the READ data correctly.  This means that the GETATTR
2441  * may end up partially falling into the page cache, and we should
2442  * shift it into the 'tail' of the xdr_buf before processing.
2443  * To do this efficiently, we need to know the total length
2444  * of data received, which doesn't seem to be available outside
2445  * of the RPC layer.
2446  *
2447  * In the case of WRITE, we also want to put the GETATTR after
2448  * the operation -- in this case because we want to make sure
2449  * we get the post-operation mtime and size.  This means that
2450  * we can't use xdr_encode_pages() as written: we need a variant
2451  * of it which would leave room in the 'tail' iovec.
2452  *
2453  * Both of these changes to the XDR layer would in fact be quite
2454  * minor, but I decided to leave them for a subsequent patch.
2455  */
2456 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2457                 unsigned int pgbase, unsigned int pglen)
2458 {
2459         struct nfs4_readlink args = {
2460                 .fh       = NFS_FH(inode),
2461                 .pgbase   = pgbase,
2462                 .pglen    = pglen,
2463                 .pages    = &page,
2464         };
2465         struct nfs4_readlink_res res;
2466         struct rpc_message msg = {
2467                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2468                 .rpc_argp = &args,
2469                 .rpc_resp = &res,
2470         };
2471
2472         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2473 }
2474
2475 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2476                 unsigned int pgbase, unsigned int pglen)
2477 {
2478         struct nfs4_exception exception = { };
2479         int err;
2480         do {
2481                 err = nfs4_handle_exception(NFS_SERVER(inode),
2482                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2483                                 &exception);
2484         } while (exception.retry);
2485         return err;
2486 }
2487
2488 /*
2489  * Got race?
2490  * We will need to arrange for the VFS layer to provide an atomic open.
2491  * Until then, this create/open method is prone to inefficiency and race
2492  * conditions due to the lookup, create, and open VFS calls from sys_open()
2493  * placed on the wire.
2494  *
2495  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2496  * The file will be opened again in the subsequent VFS open call
2497  * (nfs4_proc_file_open).
2498  *
2499  * The open for read will just hang around to be used by any process that
2500  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2501  */
2502
2503 static int
2504 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2505                  int flags, struct nfs_open_context *ctx)
2506 {
2507         struct path my_path = {
2508                 .dentry = dentry,
2509         };
2510         struct path *path = &my_path;
2511         struct nfs4_state *state;
2512         struct rpc_cred *cred = NULL;
2513         fmode_t fmode = 0;
2514         int status = 0;
2515
2516         if (ctx != NULL) {
2517                 cred = ctx->cred;
2518                 path = &ctx->path;
2519                 fmode = ctx->mode;
2520         }
2521         sattr->ia_mode &= ~current_umask();
2522         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2523         d_drop(dentry);
2524         if (IS_ERR(state)) {
2525                 status = PTR_ERR(state);
2526                 goto out;
2527         }
2528         d_add(dentry, igrab(state->inode));
2529         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2530         if (ctx != NULL)
2531                 ctx->state = state;
2532         else
2533                 nfs4_close_sync(path, state, fmode);
2534 out:
2535         return status;
2536 }
2537
2538 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2539 {
2540         struct nfs_server *server = NFS_SERVER(dir);
2541         struct nfs_removeargs args = {
2542                 .fh = NFS_FH(dir),
2543                 .name.len = name->len,
2544                 .name.name = name->name,
2545                 .bitmask = server->attr_bitmask,
2546         };
2547         struct nfs_removeres res = {
2548                 .server = server,
2549         };
2550         struct rpc_message msg = {
2551                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2552                 .rpc_argp = &args,
2553                 .rpc_resp = &res,
2554         };
2555         int status = -ENOMEM;
2556
2557         res.dir_attr = nfs_alloc_fattr();
2558         if (res.dir_attr == NULL)
2559                 goto out;
2560
2561         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2562         if (status == 0) {
2563                 update_changeattr(dir, &res.cinfo);
2564                 nfs_post_op_update_inode(dir, res.dir_attr);
2565         }
2566         nfs_free_fattr(res.dir_attr);
2567 out:
2568         return status;
2569 }
2570
2571 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2572 {
2573         struct nfs4_exception exception = { };
2574         int err;
2575         do {
2576                 err = nfs4_handle_exception(NFS_SERVER(dir),
2577                                 _nfs4_proc_remove(dir, name),
2578                                 &exception);
2579         } while (exception.retry);
2580         return err;
2581 }
2582
2583 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2584 {
2585         struct nfs_server *server = NFS_SERVER(dir);
2586         struct nfs_removeargs *args = msg->rpc_argp;
2587         struct nfs_removeres *res = msg->rpc_resp;
2588
2589         args->bitmask = server->cache_consistency_bitmask;
2590         res->server = server;
2591         res->seq_res.sr_slot = NULL;
2592         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2593 }
2594
2595 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2596 {
2597         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2598
2599         if (!nfs4_sequence_done(task, &res->seq_res))
2600                 return 0;
2601         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2602                 return 0;
2603         update_changeattr(dir, &res->cinfo);
2604         nfs_post_op_update_inode(dir, res->dir_attr);
2605         return 1;
2606 }
2607
2608 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2609 {
2610         struct nfs_server *server = NFS_SERVER(dir);
2611         struct nfs_renameargs *arg = msg->rpc_argp;
2612         struct nfs_renameres *res = msg->rpc_resp;
2613
2614         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2615         arg->bitmask = server->attr_bitmask;
2616         res->server = server;
2617 }
2618
2619 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2620                                  struct inode *new_dir)
2621 {
2622         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2623
2624         if (!nfs4_sequence_done(task, &res->seq_res))
2625                 return 0;
2626         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2627                 return 0;
2628
2629         update_changeattr(old_dir, &res->old_cinfo);
2630         nfs_post_op_update_inode(old_dir, res->old_fattr);
2631         update_changeattr(new_dir, &res->new_cinfo);
2632         nfs_post_op_update_inode(new_dir, res->new_fattr);
2633         return 1;
2634 }
2635
2636 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2637                 struct inode *new_dir, struct qstr *new_name)
2638 {
2639         struct nfs_server *server = NFS_SERVER(old_dir);
2640         struct nfs_renameargs arg = {
2641                 .old_dir = NFS_FH(old_dir),
2642                 .new_dir = NFS_FH(new_dir),
2643                 .old_name = old_name,
2644                 .new_name = new_name,
2645                 .bitmask = server->attr_bitmask,
2646         };
2647         struct nfs_renameres res = {
2648                 .server = server,
2649         };
2650         struct rpc_message msg = {
2651                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2652                 .rpc_argp = &arg,
2653                 .rpc_resp = &res,
2654         };
2655         int status = -ENOMEM;
2656
2657         res.old_fattr = nfs_alloc_fattr();
2658         res.new_fattr = nfs_alloc_fattr();
2659         if (res.old_fattr == NULL || res.new_fattr == NULL)
2660                 goto out;
2661
2662         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2663         if (!status) {
2664                 update_changeattr(old_dir, &res.old_cinfo);
2665                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2666                 update_changeattr(new_dir, &res.new_cinfo);
2667                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2668         }
2669 out:
2670         nfs_free_fattr(res.new_fattr);
2671         nfs_free_fattr(res.old_fattr);
2672         return status;
2673 }
2674
2675 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2676                 struct inode *new_dir, struct qstr *new_name)
2677 {
2678         struct nfs4_exception exception = { };
2679         int err;
2680         do {
2681                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2682                                 _nfs4_proc_rename(old_dir, old_name,
2683                                         new_dir, new_name),
2684                                 &exception);
2685         } while (exception.retry);
2686         return err;
2687 }
2688
2689 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2690 {
2691         struct nfs_server *server = NFS_SERVER(inode);
2692         struct nfs4_link_arg arg = {
2693                 .fh     = NFS_FH(inode),
2694                 .dir_fh = NFS_FH(dir),
2695                 .name   = name,
2696                 .bitmask = server->attr_bitmask,
2697         };
2698         struct nfs4_link_res res = {
2699                 .server = server,
2700         };
2701         struct rpc_message msg = {
2702                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2703                 .rpc_argp = &arg,
2704                 .rpc_resp = &res,
2705         };
2706         int status = -ENOMEM;
2707
2708         res.fattr = nfs_alloc_fattr();
2709         res.dir_attr = nfs_alloc_fattr();
2710         if (res.fattr == NULL || res.dir_attr == NULL)
2711                 goto out;
2712
2713         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2714         if (!status) {
2715                 update_changeattr(dir, &res.cinfo);
2716                 nfs_post_op_update_inode(dir, res.dir_attr);
2717                 nfs_post_op_update_inode(inode, res.fattr);
2718         }
2719 out:
2720         nfs_free_fattr(res.dir_attr);
2721         nfs_free_fattr(res.fattr);
2722         return status;
2723 }
2724
2725 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2726 {
2727         struct nfs4_exception exception = { };
2728         int err;
2729         do {
2730                 err = nfs4_handle_exception(NFS_SERVER(inode),
2731                                 _nfs4_proc_link(inode, dir, name),
2732                                 &exception);
2733         } while (exception.retry);
2734         return err;
2735 }
2736
2737 struct nfs4_createdata {
2738         struct rpc_message msg;
2739         struct nfs4_create_arg arg;
2740         struct nfs4_create_res res;
2741         struct nfs_fh fh;
2742         struct nfs_fattr fattr;
2743         struct nfs_fattr dir_fattr;
2744 };
2745
2746 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2747                 struct qstr *name, struct iattr *sattr, u32 ftype)
2748 {
2749         struct nfs4_createdata *data;
2750
2751         data = kzalloc(sizeof(*data), GFP_KERNEL);
2752         if (data != NULL) {
2753                 struct nfs_server *server = NFS_SERVER(dir);
2754
2755                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2756                 data->msg.rpc_argp = &data->arg;
2757                 data->msg.rpc_resp = &data->res;
2758                 data->arg.dir_fh = NFS_FH(dir);
2759                 data->arg.server = server;
2760                 data->arg.name = name;
2761                 data->arg.attrs = sattr;
2762                 data->arg.ftype = ftype;
2763                 data->arg.bitmask = server->attr_bitmask;
2764                 data->res.server = server;
2765                 data->res.fh = &data->fh;
2766                 data->res.fattr = &data->fattr;
2767                 data->res.dir_fattr = &data->dir_fattr;
2768                 nfs_fattr_init(data->res.fattr);
2769                 nfs_fattr_init(data->res.dir_fattr);
2770         }
2771         return data;
2772 }
2773
2774 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2775 {
2776         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2777                                     &data->arg, &data->res, 1);
2778         if (status == 0) {
2779                 update_changeattr(dir, &data->res.dir_cinfo);
2780                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2781                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2782         }
2783         return status;
2784 }
2785
2786 static void nfs4_free_createdata(struct nfs4_createdata *data)
2787 {
2788         kfree(data);
2789 }
2790
2791 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2792                 struct page *page, unsigned int len, struct iattr *sattr)
2793 {
2794         struct nfs4_createdata *data;
2795         int status = -ENAMETOOLONG;
2796
2797         if (len > NFS4_MAXPATHLEN)
2798                 goto out;
2799
2800         status = -ENOMEM;
2801         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2802         if (data == NULL)
2803                 goto out;
2804
2805         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2806         data->arg.u.symlink.pages = &page;
2807         data->arg.u.symlink.len = len;
2808
2809         status = nfs4_do_create(dir, dentry, data);
2810
2811         nfs4_free_createdata(data);
2812 out:
2813         return status;
2814 }
2815
2816 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2817                 struct page *page, unsigned int len, struct iattr *sattr)
2818 {
2819         struct nfs4_exception exception = { };
2820         int err;
2821         do {
2822                 err = nfs4_handle_exception(NFS_SERVER(dir),
2823                                 _nfs4_proc_symlink(dir, dentry, page,
2824                                                         len, sattr),
2825                                 &exception);
2826         } while (exception.retry);
2827         return err;
2828 }
2829
2830 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2831                 struct iattr *sattr)
2832 {
2833         struct nfs4_createdata *data;
2834         int status = -ENOMEM;
2835
2836         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2837         if (data == NULL)
2838                 goto out;
2839
2840         status = nfs4_do_create(dir, dentry, data);
2841
2842         nfs4_free_createdata(data);
2843 out:
2844         return status;
2845 }
2846
2847 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2848                 struct iattr *sattr)
2849 {
2850         struct nfs4_exception exception = { };
2851         int err;
2852
2853         sattr->ia_mode &= ~current_umask();
2854         do {
2855                 err = nfs4_handle_exception(NFS_SERVER(dir),
2856                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2857                                 &exception);
2858         } while (exception.retry);
2859         return err;
2860 }
2861
2862 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2863                 u64 cookie, struct page **pages, unsigned int count, int plus)
2864 {
2865         struct inode            *dir = dentry->d_inode;
2866         struct nfs4_readdir_arg args = {
2867                 .fh = NFS_FH(dir),
2868                 .pages = pages,
2869                 .pgbase = 0,
2870                 .count = count,
2871                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2872                 .plus = plus,
2873         };
2874         struct nfs4_readdir_res res;
2875         struct rpc_message msg = {
2876                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2877                 .rpc_argp = &args,
2878                 .rpc_resp = &res,
2879                 .rpc_cred = cred,
2880         };
2881         int                     status;
2882
2883         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2884                         dentry->d_parent->d_name.name,
2885                         dentry->d_name.name,
2886                         (unsigned long long)cookie);
2887         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2888         res.pgbase = args.pgbase;
2889         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2890         if (status >= 0) {
2891                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2892                 status += args.pgbase;
2893         }
2894
2895         nfs_invalidate_atime(dir);
2896
2897         dprintk("%s: returns %d\n", __func__, status);
2898         return status;
2899 }
2900
2901 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2902                 u64 cookie, struct page **pages, unsigned int count, int plus)
2903 {
2904         struct nfs4_exception exception = { };
2905         int err;
2906         do {
2907                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2908                                 _nfs4_proc_readdir(dentry, cred, cookie,
2909                                         pages, count, plus),
2910                                 &exception);
2911         } while (exception.retry);
2912         return err;
2913 }
2914
2915 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2916                 struct iattr *sattr, dev_t rdev)
2917 {
2918         struct nfs4_createdata *data;
2919         int mode = sattr->ia_mode;
2920         int status = -ENOMEM;
2921
2922         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2923         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2924
2925         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2926         if (data == NULL)
2927                 goto out;
2928
2929         if (S_ISFIFO(mode))
2930                 data->arg.ftype = NF4FIFO;
2931         else if (S_ISBLK(mode)) {
2932                 data->arg.ftype = NF4BLK;
2933                 data->arg.u.device.specdata1 = MAJOR(rdev);
2934                 data->arg.u.device.specdata2 = MINOR(rdev);
2935         }
2936         else if (S_ISCHR(mode)) {
2937                 data->arg.ftype = NF4CHR;
2938                 data->arg.u.device.specdata1 = MAJOR(rdev);
2939                 data->arg.u.device.specdata2 = MINOR(rdev);
2940         }
2941
2942         status = nfs4_do_create(dir, dentry, data);
2943
2944         nfs4_free_createdata(data);
2945 out:
2946         return status;
2947 }
2948
2949 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2950                 struct iattr *sattr, dev_t rdev)
2951 {
2952         struct nfs4_exception exception = { };
2953         int err;
2954
2955         sattr->ia_mode &= ~current_umask();
2956         do {
2957                 err = nfs4_handle_exception(NFS_SERVER(dir),
2958                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2959                                 &exception);
2960         } while (exception.retry);
2961         return err;
2962 }
2963
2964 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2965                  struct nfs_fsstat *fsstat)
2966 {
2967         struct nfs4_statfs_arg args = {
2968                 .fh = fhandle,
2969                 .bitmask = server->attr_bitmask,
2970         };
2971         struct nfs4_statfs_res res = {
2972                 .fsstat = fsstat,
2973         };
2974         struct rpc_message msg = {
2975                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2976                 .rpc_argp = &args,
2977                 .rpc_resp = &res,
2978         };
2979
2980         nfs_fattr_init(fsstat->fattr);
2981         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2982 }
2983
2984 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2985 {
2986         struct nfs4_exception exception = { };
2987         int err;
2988         do {
2989                 err = nfs4_handle_exception(server,
2990                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2991                                 &exception);
2992         } while (exception.retry);
2993         return err;
2994 }
2995
2996 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2997                 struct nfs_fsinfo *fsinfo)
2998 {
2999         struct nfs4_fsinfo_arg args = {
3000                 .fh = fhandle,
3001                 .bitmask = server->attr_bitmask,
3002         };
3003         struct nfs4_fsinfo_res res = {
3004                 .fsinfo = fsinfo,
3005         };
3006         struct rpc_message msg = {
3007                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3008                 .rpc_argp = &args,
3009                 .rpc_resp = &res,
3010         };
3011
3012         return nfs4_call_sync(server, &msg, &args, &res, 0);
3013 }
3014
3015 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3016 {
3017         struct nfs4_exception exception = { };
3018         int err;
3019
3020         do {
3021                 err = nfs4_handle_exception(server,
3022                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3023                                 &exception);
3024         } while (exception.retry);
3025         return err;
3026 }
3027
3028 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3029 {
3030         nfs_fattr_init(fsinfo->fattr);
3031         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3032 }
3033
3034 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3035                 struct nfs_pathconf *pathconf)
3036 {
3037         struct nfs4_pathconf_arg args = {
3038                 .fh = fhandle,
3039                 .bitmask = server->attr_bitmask,
3040         };
3041         struct nfs4_pathconf_res res = {
3042                 .pathconf = pathconf,
3043         };
3044         struct rpc_message msg = {
3045                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3046                 .rpc_argp = &args,
3047                 .rpc_resp = &res,
3048         };
3049
3050         /* None of the pathconf attributes are mandatory to implement */
3051         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3052                 memset(pathconf, 0, sizeof(*pathconf));
3053                 return 0;
3054         }
3055
3056         nfs_fattr_init(pathconf->fattr);
3057         return nfs4_call_sync(server, &msg, &args, &res, 0);
3058 }
3059
3060 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3061                 struct nfs_pathconf *pathconf)
3062 {
3063         struct nfs4_exception exception = { };
3064         int err;
3065
3066         do {
3067                 err = nfs4_handle_exception(server,
3068                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3069                                 &exception);
3070         } while (exception.retry);
3071         return err;
3072 }
3073
3074 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3075 {
3076         struct nfs_server *server = NFS_SERVER(data->inode);
3077
3078         dprintk("--> %s\n", __func__);
3079
3080         if (!nfs4_sequence_done(task, &data->res.seq_res))
3081                 return -EAGAIN;
3082
3083         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3084                 nfs_restart_rpc(task, server->nfs_client);
3085                 return -EAGAIN;
3086         }
3087
3088         nfs_invalidate_atime(data->inode);
3089         if (task->tk_status > 0)
3090                 renew_lease(server, data->timestamp);
3091         return 0;
3092 }
3093
3094 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3095 {
3096         data->timestamp   = jiffies;
3097         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3098 }
3099
3100 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3101 {
3102         struct inode *inode = data->inode;
3103
3104         if (!nfs4_sequence_done(task, &data->res.seq_res))
3105                 return -EAGAIN;
3106
3107         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3108                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3109                 return -EAGAIN;
3110         }
3111         if (task->tk_status >= 0) {
3112                 renew_lease(NFS_SERVER(inode), data->timestamp);
3113                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3114         }
3115         return 0;
3116 }
3117
3118 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3119 {
3120         struct nfs_server *server = NFS_SERVER(data->inode);
3121
3122         data->args.bitmask = server->cache_consistency_bitmask;
3123         data->res.server = server;
3124         data->timestamp   = jiffies;
3125
3126         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3127 }
3128
3129 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3130 {
3131         struct inode *inode = data->inode;
3132
3133         if (!nfs4_sequence_done(task, &data->res.seq_res))
3134                 return -EAGAIN;
3135
3136         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3137                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3138                 return -EAGAIN;
3139         }
3140         nfs_refresh_inode(inode, data->res.fattr);
3141         return 0;
3142 }
3143
3144 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3145 {
3146         struct nfs_server *server = NFS_SERVER(data->inode);
3147
3148         data->args.bitmask = server->cache_consistency_bitmask;
3149         data->res.server = server;
3150         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3151 }
3152
3153 struct nfs4_renewdata {
3154         struct nfs_client       *client;
3155         unsigned long           timestamp;
3156 };
3157
3158 /*
3159  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3160  * standalone procedure for queueing an asynchronous RENEW.
3161  */
3162 static void nfs4_renew_release(void *calldata)
3163 {
3164         struct nfs4_renewdata *data = calldata;
3165         struct nfs_client *clp = data->client;
3166
3167         if (atomic_read(&clp->cl_count) > 1)
3168                 nfs4_schedule_state_renewal(clp);
3169         nfs_put_client(clp);
3170         kfree(data);
3171 }
3172
3173 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3174 {
3175         struct nfs4_renewdata *data = calldata;
3176         struct nfs_client *clp = data->client;
3177         unsigned long timestamp = data->timestamp;
3178
3179         if (task->tk_status < 0) {
3180                 /* Unless we're shutting down, schedule state recovery! */
3181                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3182                         nfs4_schedule_state_recovery(clp);
3183                 return;
3184         }
3185         do_renew_lease(clp, timestamp);
3186 }
3187
3188 static const struct rpc_call_ops nfs4_renew_ops = {
3189         .rpc_call_done = nfs4_renew_done,
3190         .rpc_release = nfs4_renew_release,
3191 };
3192
3193 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3194 {
3195         struct rpc_message msg = {
3196                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3197                 .rpc_argp       = clp,
3198                 .rpc_cred       = cred,
3199         };
3200         struct nfs4_renewdata *data;
3201
3202         if (!atomic_inc_not_zero(&clp->cl_count))
3203                 return -EIO;
3204         data = kmalloc(sizeof(*data), GFP_KERNEL);
3205         if (data == NULL)
3206                 return -ENOMEM;
3207         data->client = clp;
3208         data->timestamp = jiffies;
3209         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3210                         &nfs4_renew_ops, data);
3211 }
3212
3213 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3214 {
3215         struct rpc_message msg = {
3216                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3217                 .rpc_argp       = clp,
3218                 .rpc_cred       = cred,
3219         };
3220         unsigned long now = jiffies;
3221         int status;
3222
3223         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3224         if (status < 0)
3225                 return status;
3226         do_renew_lease(clp, now);
3227         return 0;
3228 }
3229
3230 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3231 {
3232         return (server->caps & NFS_CAP_ACLS)
3233                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3234                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3235 }
3236
3237 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3238  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3239  * the stack.
3240  */
3241 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3242
3243 static void buf_to_pages(const void *buf, size_t buflen,
3244                 struct page **pages, unsigned int *pgbase)
3245 {
3246         const void *p = buf;
3247
3248         *pgbase = offset_in_page(buf);
3249         p -= *pgbase;
3250         while (p < buf + buflen) {
3251                 *(pages++) = virt_to_page(p);
3252                 p += PAGE_CACHE_SIZE;
3253         }
3254 }
3255
3256 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3257                 struct page **pages, unsigned int *pgbase)
3258 {
3259         struct page *newpage, **spages;
3260         int rc = 0;
3261         size_t len;
3262         spages = pages;
3263
3264         do {
3265                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3266                 newpage = alloc_page(GFP_KERNEL);
3267
3268                 if (newpage == NULL)
3269                         goto unwind;
3270                 memcpy(page_address(newpage), buf, len);
3271                 buf += len;
3272                 buflen -= len;
3273                 *pages++ = newpage;
3274                 rc++;
3275         } while (buflen != 0);
3276
3277         return rc;
3278
3279 unwind:
3280         for(; rc > 0; rc--)
3281                 __free_page(spages[rc-1]);
3282         return -ENOMEM;
3283 }
3284
3285 struct nfs4_cached_acl {
3286         int cached;
3287         size_t len;
3288         char data[0];
3289 };
3290
3291 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3292 {
3293         struct nfs_inode *nfsi = NFS_I(inode);
3294
3295         spin_lock(&inode->i_lock);
3296         kfree(nfsi->nfs4_acl);
3297         nfsi->nfs4_acl = acl;
3298         spin_unlock(&inode->i_lock);
3299 }
3300
3301 static void nfs4_zap_acl_attr(struct inode *inode)
3302 {
3303         nfs4_set_cached_acl(inode, NULL);
3304 }
3305
3306 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3307 {
3308         struct nfs_inode *nfsi = NFS_I(inode);
3309         struct nfs4_cached_acl *acl;
3310         int ret = -ENOENT;
3311
3312         spin_lock(&inode->i_lock);
3313         acl = nfsi->nfs4_acl;
3314         if (acl == NULL)
3315                 goto out;
3316         if (buf == NULL) /* user is just asking for length */
3317                 goto out_len;
3318         if (acl->cached == 0)
3319                 goto out;
3320         ret = -ERANGE; /* see getxattr(2) man page */
3321         if (acl->len > buflen)
3322                 goto out;
3323         memcpy(buf, acl->data, acl->len);
3324 out_len:
3325         ret = acl->len;
3326 out:
3327         spin_unlock(&inode->i_lock);
3328         return ret;
3329 }
3330
3331 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3332 {
3333         struct nfs4_cached_acl *acl;
3334
3335         if (buf && acl_len <= PAGE_SIZE) {
3336                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3337                 if (acl == NULL)
3338                         goto out;
3339                 acl->cached = 1;
3340                 memcpy(acl->data, buf, acl_len);
3341         } else {
3342                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3343                 if (acl == NULL)
3344                         goto out;
3345                 acl->cached = 0;
3346         }
3347         acl->len = acl_len;
3348 out:
3349         nfs4_set_cached_acl(inode, acl);
3350 }
3351
3352 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3353 {
3354         struct page *pages[NFS4ACL_MAXPAGES];
3355         struct nfs_getaclargs args = {
3356                 .fh = NFS_FH(inode),
3357                 .acl_pages = pages,
3358                 .acl_len = buflen,
3359         };
3360         struct nfs_getaclres res = {
3361                 .acl_len = buflen,
3362         };
3363         void *resp_buf;
3364         struct rpc_message msg = {
3365                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3366                 .rpc_argp = &args,
3367                 .rpc_resp = &res,
3368         };
3369         struct page *localpage = NULL;
3370         int ret;
3371
3372         if (buflen < PAGE_SIZE) {
3373                 /* As long as we're doing a round trip to the server anyway,
3374                  * let's be prepared for a page of acl data. */
3375                 localpage = alloc_page(GFP_KERNEL);
3376                 resp_buf = page_address(localpage);
3377                 if (localpage == NULL)
3378                         return -ENOMEM;
3379                 args.acl_pages[0] = localpage;
3380                 args.acl_pgbase = 0;
3381                 args.acl_len = PAGE_SIZE;
3382         } else {
3383                 resp_buf = buf;
3384                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3385         }
3386         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3387         if (ret)
3388                 goto out_free;
3389         if (res.acl_len > args.acl_len)
3390                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3391         else
3392                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3393         if (buf) {
3394                 ret = -ERANGE;
3395                 if (res.acl_len > buflen)
3396                         goto out_free;
3397                 if (localpage)
3398                         memcpy(buf, resp_buf, res.acl_len);
3399         }
3400         ret = res.acl_len;
3401 out_free:
3402         if (localpage)
3403                 __free_page(localpage);
3404         return ret;
3405 }
3406
3407 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3408 {
3409         struct nfs4_exception exception = { };
3410         ssize_t ret;
3411         do {
3412                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3413                 if (ret >= 0)
3414                         break;
3415                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3416         } while (exception.retry);
3417         return ret;
3418 }
3419
3420 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3421 {
3422         struct nfs_server *server = NFS_SERVER(inode);
3423         int ret;
3424
3425         if (!nfs4_server_supports_acls(server))
3426                 return -EOPNOTSUPP;
3427         ret = nfs_revalidate_inode(server, inode);
3428         if (ret < 0)
3429                 return ret;
3430         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3431                 nfs_zap_acl_cache(inode);
3432         ret = nfs4_read_cached_acl(inode, buf, buflen);
3433         if (ret != -ENOENT)
3434                 return ret;
3435         return nfs4_get_acl_uncached(inode, buf, buflen);
3436 }
3437
3438 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3439 {
3440         struct nfs_server *server = NFS_SERVER(inode);
3441         struct page *pages[NFS4ACL_MAXPAGES];
3442         struct nfs_setaclargs arg = {
3443                 .fh             = NFS_FH(inode),
3444                 .acl_pages      = pages,
3445                 .acl_len        = buflen,
3446         };
3447         struct nfs_setaclres res;
3448         struct rpc_message msg = {
3449                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3450                 .rpc_argp       = &arg,
3451                 .rpc_resp       = &res,
3452         };
3453         int ret, i;
3454
3455         if (!nfs4_server_supports_acls(server))
3456                 return -EOPNOTSUPP;
3457         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3458         if (i < 0)
3459                 return i;
3460         nfs_inode_return_delegation(inode);
3461         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3462
3463         /*
3464          * Free each page after tx, so the only ref left is
3465          * held by the network stack
3466          */
3467         for (; i > 0; i--)
3468                 put_page(pages[i-1]);
3469
3470         /*
3471          * Acl update can result in inode attribute update.
3472          * so mark the attribute cache invalid.
3473          */
3474         spin_lock(&inode->i_lock);
3475         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3476         spin_unlock(&inode->i_lock);
3477         nfs_access_zap_cache(inode);
3478         nfs_zap_acl_cache(inode);
3479         return ret;
3480 }
3481
3482 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3483 {
3484         struct nfs4_exception exception = { };
3485         int err;
3486         do {
3487                 err = nfs4_handle_exception(NFS_SERVER(inode),
3488                                 __nfs4_proc_set_acl(inode, buf, buflen),
3489                                 &exception);
3490         } while (exception.retry);
3491         return err;
3492 }
3493
3494 static int
3495 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3496 {
3497         struct nfs_client *clp = server->nfs_client;
3498
3499         if (task->tk_status >= 0)
3500                 return 0;
3501         switch(task->tk_status) {
3502                 case -NFS4ERR_ADMIN_REVOKED:
3503                 case -NFS4ERR_BAD_STATEID:
3504                 case -NFS4ERR_OPENMODE:
3505                         if (state == NULL)
3506                                 break;
3507                         nfs4_state_mark_reclaim_nograce(clp, state);
3508                         goto do_state_recovery;
3509                 case -NFS4ERR_STALE_STATEID:
3510                 case -NFS4ERR_STALE_CLIENTID:
3511                 case -NFS4ERR_EXPIRED:
3512                         goto do_state_recovery;
3513 #if defined(CONFIG_NFS_V4_1)
3514                 case -NFS4ERR_BADSESSION:
3515                 case -NFS4ERR_BADSLOT:
3516                 case -NFS4ERR_BAD_HIGH_SLOT:
3517                 case -NFS4ERR_DEADSESSION:
3518                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3519                 case -NFS4ERR_SEQ_FALSE_RETRY:
3520                 case -NFS4ERR_SEQ_MISORDERED:
3521                         dprintk("%s ERROR %d, Reset session\n", __func__,
3522                                 task->tk_status);
3523                         nfs4_schedule_state_recovery(clp);
3524                         task->tk_status = 0;
3525                         return -EAGAIN;
3526 #endif /* CONFIG_NFS_V4_1 */
3527                 case -NFS4ERR_DELAY:
3528                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3529                 case -NFS4ERR_GRACE:
3530                 case -EKEYEXPIRED:
3531                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3532                         task->tk_status = 0;
3533                         return -EAGAIN;
3534                 case -NFS4ERR_OLD_STATEID:
3535                         task->tk_status = 0;
3536                         return -EAGAIN;
3537         }
3538         task->tk_status = nfs4_map_errors(task->tk_status);
3539         return 0;
3540 do_state_recovery:
3541         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3542         nfs4_schedule_state_recovery(clp);
3543         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3544                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3545         task->tk_status = 0;
3546         return -EAGAIN;
3547 }
3548
3549 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3550                 unsigned short port, struct rpc_cred *cred,
3551                 struct nfs4_setclientid_res *res)
3552 {
3553         nfs4_verifier sc_verifier;
3554         struct nfs4_setclientid setclientid = {
3555                 .sc_verifier = &sc_verifier,
3556                 .sc_prog = program,
3557                 .sc_cb_ident = clp->cl_cb_ident,
3558         };
3559         struct rpc_message msg = {
3560                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3561                 .rpc_argp = &setclientid,
3562                 .rpc_resp = res,
3563                 .rpc_cred = cred,
3564         };
3565         __be32 *p;
3566         int loop = 0;
3567         int status;
3568
3569         p = (__be32*)sc_verifier.data;
3570         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3571         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3572
3573         for(;;) {
3574                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3575                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3576                                 clp->cl_ipaddr,
3577                                 rpc_peeraddr2str(clp->cl_rpcclient,
3578                                                         RPC_DISPLAY_ADDR),
3579                                 rpc_peeraddr2str(clp->cl_rpcclient,
3580                                                         RPC_DISPLAY_PROTO),
3581                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3582                                 clp->cl_id_uniquifier);
3583                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3584                                 sizeof(setclientid.sc_netid),
3585                                 rpc_peeraddr2str(clp->cl_rpcclient,
3586                                                         RPC_DISPLAY_NETID));
3587                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3588                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3589                                 clp->cl_ipaddr, port >> 8, port & 255);
3590
3591                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3592                 if (status != -NFS4ERR_CLID_INUSE)
3593                         break;
3594                 if (signalled())
3595                         break;
3596                 if (loop++ & 1)
3597                         ssleep(clp->cl_lease_time / HZ + 1);
3598                 else
3599                         if (++clp->cl_id_uniquifier == 0)
3600                                 break;
3601         }
3602         return status;
3603 }
3604
3605 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3606                 struct nfs4_setclientid_res *arg,
3607                 struct rpc_cred *cred)
3608 {
3609         struct nfs_fsinfo fsinfo;
3610         struct rpc_message msg = {
3611                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3612                 .rpc_argp = arg,
3613                 .rpc_resp = &fsinfo,
3614                 .rpc_cred = cred,
3615         };
3616         unsigned long now;
3617         int status;
3618
3619         now = jiffies;
3620         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3621         if (status == 0) {
3622                 spin_lock(&clp->cl_lock);
3623                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3624                 clp->cl_last_renewal = now;
3625                 spin_unlock(&clp->cl_lock);
3626         }
3627         return status;
3628 }
3629
3630 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3631                 struct nfs4_setclientid_res *arg,
3632                 struct rpc_cred *cred)
3633 {
3634         long timeout = 0;
3635         int err;
3636         do {
3637                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3638                 switch (err) {
3639                         case 0:
3640                                 return err;
3641                         case -NFS4ERR_RESOURCE:
3642                                 /* The IBM lawyers misread another document! */
3643                         case -NFS4ERR_DELAY:
3644                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3645                 }
3646         } while (err == 0);
3647         return err;
3648 }
3649
3650 struct nfs4_delegreturndata {
3651         struct nfs4_delegreturnargs args;
3652         struct nfs4_delegreturnres res;
3653         struct nfs_fh fh;
3654         nfs4_stateid stateid;
3655         unsigned long timestamp;
3656         struct nfs_fattr fattr;
3657         int rpc_status;
3658 };
3659
3660 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3661 {
3662         struct nfs4_delegreturndata *data = calldata;
3663
3664         if (!nfs4_sequence_done(task, &data->res.seq_res))
3665                 return;
3666
3667         switch (task->tk_status) {
3668         case -NFS4ERR_STALE_STATEID:
3669         case -NFS4ERR_EXPIRED:
3670         case 0:
3671                 renew_lease(data->res.server, data->timestamp);
3672                 break;
3673         default:
3674                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3675                                 -EAGAIN) {
3676                         nfs_restart_rpc(task, data->res.server->nfs_client);
3677                         return;
3678                 }
3679         }
3680         data->rpc_status = task->tk_status;
3681 }
3682
3683 static void nfs4_delegreturn_release(void *calldata)
3684 {
3685         kfree(calldata);
3686 }
3687
3688 #if defined(CONFIG_NFS_V4_1)
3689 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3690 {
3691         struct nfs4_delegreturndata *d_data;
3692
3693         d_data = (struct nfs4_delegreturndata *)data;
3694
3695         if (nfs4_setup_sequence(d_data->res.server,
3696                                 &d_data->args.seq_args,
3697                                 &d_data->res.seq_res, 1, task))
3698                 return;
3699         rpc_call_start(task);
3700 }
3701 #endif /* CONFIG_NFS_V4_1 */
3702
3703 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3704 #if defined(CONFIG_NFS_V4_1)
3705         .rpc_call_prepare = nfs4_delegreturn_prepare,
3706 #endif /* CONFIG_NFS_V4_1 */
3707         .rpc_call_done = nfs4_delegreturn_done,
3708         .rpc_release = nfs4_delegreturn_release,
3709 };
3710
3711 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3712 {
3713         struct nfs4_delegreturndata *data;
3714         struct nfs_server *server = NFS_SERVER(inode);
3715         struct rpc_task *task;
3716         struct rpc_message msg = {
3717                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3718                 .rpc_cred = cred,
3719         };
3720         struct rpc_task_setup task_setup_data = {
3721                 .rpc_client = server->client,
3722                 .rpc_message = &msg,
3723                 .callback_ops = &nfs4_delegreturn_ops,
3724                 .flags = RPC_TASK_ASYNC,
3725         };
3726         int status = 0;
3727
3728         data = kzalloc(sizeof(*data), GFP_NOFS);
3729         if (data == NULL)
3730                 return -ENOMEM;
3731         data->args.fhandle = &data->fh;
3732         data->args.stateid = &data->stateid;
3733         data->args.bitmask = server->attr_bitmask;
3734         nfs_copy_fh(&data->fh, NFS_FH(inode));
3735         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3736         data->res.fattr = &data->fattr;
3737         data->res.server = server;
3738         nfs_fattr_init(data->res.fattr);
3739         data->timestamp = jiffies;
3740         data->rpc_status = 0;
3741
3742         task_setup_data.callback_data = data;
3743         msg.rpc_argp = &data->args;
3744         msg.rpc_resp = &data->res;
3745         task = rpc_run_task(&task_setup_data);
3746         if (IS_ERR(task))
3747                 return PTR_ERR(task);
3748         if (!issync)
3749                 goto out;
3750         status = nfs4_wait_for_completion_rpc_task(task);
3751         if (status != 0)
3752                 goto out;
3753         status = data->rpc_status;
3754         if (status != 0)
3755                 goto out;
3756         nfs_refresh_inode(inode, &data->fattr);
3757 out:
3758         rpc_put_task(task);
3759         return status;
3760 }
3761
3762 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3763 {
3764         struct nfs_server *server = NFS_SERVER(inode);
3765         struct nfs4_exception exception = { };
3766         int err;
3767         do {
3768                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3769                 switch (err) {
3770                         case -NFS4ERR_STALE_STATEID:
3771                         case -NFS4ERR_EXPIRED:
3772                         case 0:
3773                                 return 0;
3774                 }
3775                 err = nfs4_handle_exception(server, err, &exception);
3776         } while (exception.retry);
3777         return err;
3778 }
3779
3780 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3781 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3782
3783 /*
3784  * sleep, with exponential backoff, and retry the LOCK operation.
3785  */
3786 static unsigned long
3787 nfs4_set_lock_task_retry(unsigned long timeout)
3788 {
3789         schedule_timeout_killable(timeout);
3790         timeout <<= 1;
3791         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3792                 return NFS4_LOCK_MAXTIMEOUT;
3793         return timeout;
3794 }
3795
3796 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3797 {
3798         struct inode *inode = state->inode;
3799         struct nfs_server *server = NFS_SERVER(inode);
3800         struct nfs_client *clp = server->nfs_client;
3801         struct nfs_lockt_args arg = {
3802                 .fh = NFS_FH(inode),
3803                 .fl = request,
3804         };
3805         struct nfs_lockt_res res = {
3806                 .denied = request,
3807         };
3808         struct rpc_message msg = {
3809                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3810                 .rpc_argp       = &arg,
3811                 .rpc_resp       = &res,
3812                 .rpc_cred       = state->owner->so_cred,
3813         };
3814         struct nfs4_lock_state *lsp;
3815         int status;
3816
3817         arg.lock_owner.clientid = clp->cl_clientid;
3818         status = nfs4_set_lock_state(state, request);
3819         if (status != 0)
3820                 goto out;
3821         lsp = request->fl_u.nfs4_fl.owner;
3822         arg.lock_owner.id = lsp->ls_id.id;
3823         arg.lock_owner.s_dev = server->s_dev;
3824         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3825         switch (status) {
3826                 case 0:
3827                         request->fl_type = F_UNLCK;
3828                         break;
3829                 case -NFS4ERR_DENIED:
3830                         status = 0;
3831         }
3832         request->fl_ops->fl_release_private(request);
3833 out:
3834         return status;
3835 }
3836
3837 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3838 {
3839         struct nfs4_exception exception = { };
3840         int err;
3841
3842         do {
3843                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3844                                 _nfs4_proc_getlk(state, cmd, request),
3845                                 &exception);
3846         } while (exception.retry);
3847         return err;
3848 }
3849
3850 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3851 {
3852         int res = 0;
3853         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3854                 case FL_POSIX:
3855                         res = posix_lock_file_wait(file, fl);
3856                         break;
3857                 case FL_FLOCK:
3858                         res = flock_lock_file_wait(file, fl);
3859                         break;
3860                 default:
3861                         BUG();
3862         }
3863         return res;
3864 }
3865
3866 struct nfs4_unlockdata {
3867         struct nfs_locku_args arg;
3868         struct nfs_locku_res res;
3869         struct nfs4_lock_state *lsp;
3870         struct nfs_open_context *ctx;
3871         struct file_lock fl;
3872         const struct nfs_server *server;
3873         unsigned long timestamp;
3874 };
3875
3876 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3877                 struct nfs_open_context *ctx,
3878                 struct nfs4_lock_state *lsp,
3879                 struct nfs_seqid *seqid)
3880 {
3881         struct nfs4_unlockdata *p;
3882         struct inode *inode = lsp->ls_state->inode;
3883
3884         p = kzalloc(sizeof(*p), GFP_NOFS);
3885         if (p == NULL)
3886                 return NULL;
3887         p->arg.fh = NFS_FH(inode);
3888         p->arg.fl = &p->fl;
3889         p->arg.seqid = seqid;
3890         p->res.seqid = seqid;
3891         p->arg.stateid = &lsp->ls_stateid;
3892         p->lsp = lsp;
3893         atomic_inc(&lsp->ls_count);
3894         /* Ensure we don't close file until we're done freeing locks! */
3895         p->ctx = get_nfs_open_context(ctx);
3896         memcpy(&p->fl, fl, sizeof(p->fl));
3897         p->server = NFS_SERVER(inode);
3898         return p;
3899 }
3900
3901 static void nfs4_locku_release_calldata(void *data)
3902 {
3903         struct nfs4_unlockdata *calldata = data;
3904         nfs_free_seqid(calldata->arg.seqid);
3905         nfs4_put_lock_state(calldata->lsp);
3906         put_nfs_open_context(calldata->ctx);
3907         kfree(calldata);
3908 }
3909
3910 static void nfs4_locku_done(struct rpc_task *task, void *data)
3911 {
3912         struct nfs4_unlockdata *calldata = data;
3913
3914         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3915                 return;
3916         switch (task->tk_status) {
3917                 case 0:
3918                         memcpy(calldata->lsp->ls_stateid.data,
3919                                         calldata->res.stateid.data,
3920                                         sizeof(calldata->lsp->ls_stateid.data));
3921                         renew_lease(calldata->server, calldata->timestamp);
3922                         break;
3923                 case -NFS4ERR_BAD_STATEID:
3924                 case -NFS4ERR_OLD_STATEID:
3925                 case -NFS4ERR_STALE_STATEID:
3926                 case -NFS4ERR_EXPIRED:
3927                         break;
3928                 default:
3929                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3930                                 nfs_restart_rpc(task,
3931                                                  calldata->server->nfs_client);
3932         }
3933 }
3934
3935 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3936 {
3937         struct nfs4_unlockdata *calldata = data;
3938
3939         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3940                 return;
3941         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3942                 /* Note: exit _without_ running nfs4_locku_done */
3943                 task->tk_action = NULL;
3944                 return;
3945         }
3946         calldata->timestamp = jiffies;
3947         if (nfs4_setup_sequence(calldata->server,
3948                                 &calldata->arg.seq_args,
3949                                 &calldata->res.seq_res, 1, task))
3950                 return;
3951         rpc_call_start(task);
3952 }
3953
3954 static const struct rpc_call_ops nfs4_locku_ops = {
3955         .rpc_call_prepare = nfs4_locku_prepare,
3956         .rpc_call_done = nfs4_locku_done,
3957         .rpc_release = nfs4_locku_release_calldata,
3958 };
3959
3960 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3961                 struct nfs_open_context *ctx,
3962                 struct nfs4_lock_state *lsp,
3963                 struct nfs_seqid *seqid)
3964 {
3965         struct nfs4_unlockdata *data;
3966         struct rpc_message msg = {
3967                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3968                 .rpc_cred = ctx->cred,
3969         };
3970         struct rpc_task_setup task_setup_data = {
3971                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3972                 .rpc_message = &msg,
3973                 .callback_ops = &nfs4_locku_ops,
3974                 .workqueue = nfsiod_workqueue,
3975                 .flags = RPC_TASK_ASYNC,
3976         };
3977
3978         /* Ensure this is an unlock - when canceling a lock, the
3979          * canceled lock is passed in, and it won't be an unlock.
3980          */
3981         fl->fl_type = F_UNLCK;
3982
3983         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3984         if (data == NULL) {
3985                 nfs_free_seqid(seqid);
3986                 return ERR_PTR(-ENOMEM);
3987         }
3988
3989         msg.rpc_argp = &data->arg;
3990         msg.rpc_resp = &data->res;
3991         task_setup_data.callback_data = data;
3992         return rpc_run_task(&task_setup_data);
3993 }
3994
3995 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3996 {
3997         struct nfs_inode *nfsi = NFS_I(state->inode);
3998         struct nfs_seqid *seqid;
3999         struct nfs4_lock_state *lsp;
4000         struct rpc_task *task;
4001         int status = 0;
4002         unsigned char fl_flags = request->fl_flags;
4003
4004         status = nfs4_set_lock_state(state, request);
4005         /* Unlock _before_ we do the RPC call */
4006         request->fl_flags |= FL_EXISTS;
4007         down_read(&nfsi->rwsem);
4008         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4009                 up_read(&nfsi->rwsem);
4010                 goto out;
4011         }
4012         up_read(&nfsi->rwsem);
4013         if (status != 0)
4014                 goto out;
4015         /* Is this a delegated lock? */
4016         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4017                 goto out;
4018         lsp = request->fl_u.nfs4_fl.owner;
4019         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4020         status = -ENOMEM;
4021         if (seqid == NULL)
4022                 goto out;
4023         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4024         status = PTR_ERR(task);
4025         if (IS_ERR(task))
4026                 goto out;
4027         status = nfs4_wait_for_completion_rpc_task(task);
4028         rpc_put_task(task);
4029 out:
4030         request->fl_flags = fl_flags;
4031         return status;
4032 }
4033
4034 struct nfs4_lockdata {
4035         struct nfs_lock_args arg;
4036         struct nfs_lock_res res;
4037         struct nfs4_lock_state *lsp;
4038         struct nfs_open_context *ctx;
4039         struct file_lock fl;
4040         unsigned long timestamp;
4041         int rpc_status;
4042         int cancelled;
4043         struct nfs_server *server;
4044 };
4045
4046 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4047                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4048                 gfp_t gfp_mask)
4049 {
4050         struct nfs4_lockdata *p;
4051         struct inode *inode = lsp->ls_state->inode;
4052         struct nfs_server *server = NFS_SERVER(inode);
4053
4054         p = kzalloc(sizeof(*p), gfp_mask);
4055         if (p == NULL)
4056                 return NULL;
4057
4058         p->arg.fh = NFS_FH(inode);
4059         p->arg.fl = &p->fl;
4060         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4061         if (p->arg.open_seqid == NULL)
4062                 goto out_free;
4063         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4064         if (p->arg.lock_seqid == NULL)
4065                 goto out_free_seqid;
4066         p->arg.lock_stateid = &lsp->ls_stateid;
4067         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4068         p->arg.lock_owner.id = lsp->ls_id.id;
4069         p->arg.lock_owner.s_dev = server->s_dev;
4070         p->res.lock_seqid = p->arg.lock_seqid;
4071         p->lsp = lsp;
4072         p->server = server;
4073         atomic_inc(&lsp->ls_count);
4074         p->ctx = get_nfs_open_context(ctx);
4075         memcpy(&p->fl, fl, sizeof(p->fl));
4076         return p;
4077 out_free_seqid:
4078         nfs_free_seqid(p->arg.open_seqid);
4079 out_free:
4080         kfree(p);
4081         return NULL;
4082 }
4083
4084 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4085 {
4086         struct nfs4_lockdata *data = calldata;
4087         struct nfs4_state *state = data->lsp->ls_state;
4088
4089         dprintk("%s: begin!\n", __func__);
4090         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4091                 return;
4092         /* Do we need to do an open_to_lock_owner? */
4093         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4094                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4095                         return;
4096                 data->arg.open_stateid = &state->stateid;
4097                 data->arg.new_lock_owner = 1;
4098                 data->res.open_seqid = data->arg.open_seqid;
4099         } else
4100                 data->arg.new_lock_owner = 0;
4101         data->timestamp = jiffies;
4102         if (nfs4_setup_sequence(data->server,
4103                                 &data->arg.seq_args,
4104                                 &data->res.seq_res, 1, task))
4105                 return;
4106         rpc_call_start(task);
4107         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4108 }
4109
4110 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4111 {
4112         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4113         nfs4_lock_prepare(task, calldata);
4114 }
4115
4116 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4117 {
4118         struct nfs4_lockdata *data = calldata;
4119
4120         dprintk("%s: begin!\n", __func__);
4121
4122         if (!nfs4_sequence_done(task, &data->res.seq_res))
4123                 return;
4124
4125         data->rpc_status = task->tk_status;
4126         if (data->arg.new_lock_owner != 0) {
4127                 if (data->rpc_status == 0)
4128                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4129                 else
4130                         goto out;
4131         }
4132         if (data->rpc_status == 0) {
4133                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4134                                         sizeof(data->lsp->ls_stateid.data));
4135                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4136                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4137         }
4138 out:
4139         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4140 }
4141
4142 static void nfs4_lock_release(void *calldata)
4143 {
4144         struct nfs4_lockdata *data = calldata;
4145
4146         dprintk("%s: begin!\n", __func__);
4147         nfs_free_seqid(data->arg.open_seqid);
4148         if (data->cancelled != 0) {
4149                 struct rpc_task *task;
4150                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4151                                 data->arg.lock_seqid);
4152                 if (!IS_ERR(task))
4153                         rpc_put_task_async(task);
4154                 dprintk("%s: cancelling lock!\n", __func__);
4155         } else
4156                 nfs_free_seqid(data->arg.lock_seqid);
4157         nfs4_put_lock_state(data->lsp);
4158         put_nfs_open_context(data->ctx);
4159         kfree(data);
4160         dprintk("%s: done!\n", __func__);
4161 }
4162
4163 static const struct rpc_call_ops nfs4_lock_ops = {
4164         .rpc_call_prepare = nfs4_lock_prepare,
4165         .rpc_call_done = nfs4_lock_done,
4166         .rpc_release = nfs4_lock_release,
4167 };
4168
4169 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4170         .rpc_call_prepare = nfs4_recover_lock_prepare,
4171         .rpc_call_done = nfs4_lock_done,
4172         .rpc_release = nfs4_lock_release,
4173 };
4174
4175 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4176 {
4177         struct nfs_client *clp = server->nfs_client;
4178         struct nfs4_state *state = lsp->ls_state;
4179
4180         switch (error) {
4181         case -NFS4ERR_ADMIN_REVOKED:
4182         case -NFS4ERR_BAD_STATEID:
4183         case -NFS4ERR_EXPIRED:
4184                 if (new_lock_owner != 0 ||
4185                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4186                         nfs4_state_mark_reclaim_nograce(clp, state);
4187                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4188                 break;
4189         case -NFS4ERR_STALE_STATEID:
4190                 if (new_lock_owner != 0 ||
4191                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4192                         nfs4_state_mark_reclaim_reboot(clp, state);
4193                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4194         };
4195 }
4196
4197 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4198 {
4199         struct nfs4_lockdata *data;
4200         struct rpc_task *task;
4201         struct rpc_message msg = {
4202                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4203                 .rpc_cred = state->owner->so_cred,
4204         };
4205         struct rpc_task_setup task_setup_data = {
4206                 .rpc_client = NFS_CLIENT(state->inode),
4207                 .rpc_message = &msg,
4208                 .callback_ops = &nfs4_lock_ops,
4209                 .workqueue = nfsiod_workqueue,
4210                 .flags = RPC_TASK_ASYNC,
4211         };
4212         int ret;
4213
4214         dprintk("%s: begin!\n", __func__);
4215         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4216                         fl->fl_u.nfs4_fl.owner,
4217                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4218         if (data == NULL)
4219                 return -ENOMEM;
4220         if (IS_SETLKW(cmd))
4221                 data->arg.block = 1;
4222         if (recovery_type > NFS_LOCK_NEW) {
4223                 if (recovery_type == NFS_LOCK_RECLAIM)
4224                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4225                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4226         }
4227         msg.rpc_argp = &data->arg;
4228         msg.rpc_resp = &data->res;
4229         task_setup_data.callback_data = data;
4230         task = rpc_run_task(&task_setup_data);
4231         if (IS_ERR(task))
4232                 return PTR_ERR(task);
4233         ret = nfs4_wait_for_completion_rpc_task(task);
4234         if (ret == 0) {
4235                 ret = data->rpc_status;
4236                 if (ret)
4237                         nfs4_handle_setlk_error(data->server, data->lsp,
4238                                         data->arg.new_lock_owner, ret);
4239         } else
4240                 data->cancelled = 1;
4241         rpc_put_task(task);
4242         dprintk("%s: done, ret = %d!\n", __func__, ret);
4243         return ret;
4244 }
4245
4246 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4247 {
4248         struct nfs_server *server = NFS_SERVER(state->inode);
4249         struct nfs4_exception exception = { };
4250         int err;
4251
4252         do {
4253                 /* Cache the lock if possible... */
4254                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4255                         return 0;
4256                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4257                 if (err != -NFS4ERR_DELAY)
4258                         break;
4259                 nfs4_handle_exception(server, err, &exception);
4260         } while (exception.retry);
4261         return err;
4262 }
4263
4264 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4265 {
4266         struct nfs_server *server = NFS_SERVER(state->inode);
4267         struct nfs4_exception exception = { };
4268         int err;
4269
4270         err = nfs4_set_lock_state(state, request);
4271         if (err != 0)
4272                 return err;
4273         do {
4274                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4275                         return 0;
4276                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4277                 switch (err) {
4278                 default:
4279                         goto out;
4280                 case -NFS4ERR_GRACE:
4281                 case -NFS4ERR_DELAY:
4282                         nfs4_handle_exception(server, err, &exception);
4283                         err = 0;
4284                 }
4285         } while (exception.retry);
4286 out:
4287         return err;
4288 }
4289
4290 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4291 {
4292         struct nfs_inode *nfsi = NFS_I(state->inode);
4293         unsigned char fl_flags = request->fl_flags;
4294         int status = -ENOLCK;
4295
4296         if ((fl_flags & FL_POSIX) &&
4297                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4298                 goto out;
4299         /* Is this a delegated open? */
4300         status = nfs4_set_lock_state(state, request);
4301         if (status != 0)
4302                 goto out;
4303         request->fl_flags |= FL_ACCESS;
4304         status = do_vfs_lock(request->fl_file, request);
4305         if (status < 0)
4306                 goto out;
4307         down_read(&nfsi->rwsem);
4308         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4309                 /* Yes: cache locks! */
4310                 /* ...but avoid races with delegation recall... */
4311                 request->fl_flags = fl_flags & ~FL_SLEEP;
4312                 status = do_vfs_lock(request->fl_file, request);
4313                 goto out_unlock;
4314         }
4315         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4316         if (status != 0)
4317                 goto out_unlock;
4318         /* Note: we always want to sleep here! */
4319         request->fl_flags = fl_flags | FL_SLEEP;
4320         if (do_vfs_lock(request->fl_file, request) < 0)
4321                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4322 out_unlock:
4323         up_read(&nfsi->rwsem);
4324 out:
4325         request->fl_flags = fl_flags;
4326         return status;
4327 }
4328
4329 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4330 {
4331         struct nfs4_exception exception = { };
4332         int err;
4333
4334         do {
4335                 err = _nfs4_proc_setlk(state, cmd, request);
4336                 if (err == -NFS4ERR_DENIED)
4337                         err = -EAGAIN;
4338                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4339                                 err, &exception);
4340         } while (exception.retry);
4341         return err;
4342 }
4343
4344 static int
4345 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4346 {
4347         struct nfs_open_context *ctx;
4348         struct nfs4_state *state;
4349         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4350         int status;
4351
4352         /* verify open state */
4353         ctx = nfs_file_open_context(filp);
4354         state = ctx->state;
4355
4356         if (request->fl_start < 0 || request->fl_end < 0)
4357                 return -EINVAL;
4358
4359         if (IS_GETLK(cmd)) {
4360                 if (state != NULL)
4361                         return nfs4_proc_getlk(state, F_GETLK, request);
4362                 return 0;
4363         }
4364
4365         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4366                 return -EINVAL;
4367
4368         if (request->fl_type == F_UNLCK) {
4369                 if (state != NULL)
4370                         return nfs4_proc_unlck(state, cmd, request);
4371                 return 0;
4372         }
4373
4374         if (state == NULL)
4375                 return -ENOLCK;
4376         do {
4377                 status = nfs4_proc_setlk(state, cmd, request);
4378                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4379                         break;
4380                 timeout = nfs4_set_lock_task_retry(timeout);
4381                 status = -ERESTARTSYS;
4382                 if (signalled())
4383                         break;
4384         } while(status < 0);
4385         return status;
4386 }
4387
4388 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4389 {
4390         struct nfs_server *server = NFS_SERVER(state->inode);
4391         struct nfs4_exception exception = { };
4392         int err;
4393
4394         err = nfs4_set_lock_state(state, fl);
4395         if (err != 0)
4396                 goto out;
4397         do {
4398                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4399                 switch (err) {
4400                         default:
4401                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4402                                                 __func__, err);
4403                         case 0:
4404                         case -ESTALE:
4405                                 goto out;
4406                         case -NFS4ERR_EXPIRED:
4407                         case -NFS4ERR_STALE_CLIENTID:
4408                         case -NFS4ERR_STALE_STATEID:
4409                         case -NFS4ERR_BADSESSION:
4410                         case -NFS4ERR_BADSLOT:
4411                         case -NFS4ERR_BAD_HIGH_SLOT:
4412                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4413                         case -NFS4ERR_DEADSESSION:
4414                                 nfs4_schedule_state_recovery(server->nfs_client);
4415                                 goto out;
4416                         case -ERESTARTSYS:
4417                                 /*
4418                                  * The show must go on: exit, but mark the
4419                                  * stateid as needing recovery.
4420                                  */
4421                         case -NFS4ERR_ADMIN_REVOKED:
4422                         case -NFS4ERR_BAD_STATEID:
4423                         case -NFS4ERR_OPENMODE:
4424                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4425                                 err = 0;
4426                                 goto out;
4427                         case -EKEYEXPIRED:
4428                                 /*
4429                                  * User RPCSEC_GSS context has expired.
4430                                  * We cannot recover this stateid now, so
4431                                  * skip it and allow recovery thread to
4432                                  * proceed.
4433                                  */
4434                                 err = 0;
4435                                 goto out;
4436                         case -ENOMEM:
4437                         case -NFS4ERR_DENIED:
4438                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4439                                 err = 0;
4440                                 goto out;
4441                         case -NFS4ERR_DELAY:
4442                                 break;
4443                 }
4444                 err = nfs4_handle_exception(server, err, &exception);
4445         } while (exception.retry);
4446 out:
4447         return err;
4448 }
4449
4450 static void nfs4_release_lockowner_release(void *calldata)
4451 {
4452         kfree(calldata);
4453 }
4454
4455 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4456         .rpc_release = nfs4_release_lockowner_release,
4457 };
4458
4459 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4460 {
4461         struct nfs_server *server = lsp->ls_state->owner->so_server;
4462         struct nfs_release_lockowner_args *args;
4463         struct rpc_message msg = {
4464                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4465         };
4466
4467         if (server->nfs_client->cl_mvops->minor_version != 0)
4468                 return;
4469         args = kmalloc(sizeof(*args), GFP_NOFS);
4470         if (!args)
4471                 return;
4472         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4473         args->lock_owner.id = lsp->ls_id.id;
4474         args->lock_owner.s_dev = server->s_dev;
4475         msg.rpc_argp = args;
4476         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4477 }
4478
4479 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4480
4481 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4482                                    const void *buf, size_t buflen,
4483                                    int flags, int type)
4484 {
4485         if (strcmp(key, "") != 0)
4486                 return -EINVAL;
4487
4488         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4489 }
4490
4491 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4492                                    void *buf, size_t buflen, int type)
4493 {
4494         if (strcmp(key, "") != 0)
4495                 return -EINVAL;
4496
4497         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4498 }
4499
4500 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4501                                        size_t list_len, const char *name,
4502                                        size_t name_len, int type)
4503 {
4504         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4505
4506         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4507                 return 0;
4508
4509         if (list && len <= list_len)
4510                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4511         return len;
4512 }
4513
4514 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4515 {
4516         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4517                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4518                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4519                 return;
4520
4521         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4522                 NFS_ATTR_FATTR_NLINK;
4523         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4524         fattr->nlink = 2;
4525 }
4526
4527 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4528                 struct nfs4_fs_locations *fs_locations, struct page *page)
4529 {
4530         struct nfs_server *server = NFS_SERVER(dir);
4531         u32 bitmask[2] = {
4532                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4533                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4534         };
4535         struct nfs4_fs_locations_arg args = {
4536                 .dir_fh = NFS_FH(dir),
4537                 .name = name,
4538                 .page = page,
4539                 .bitmask = bitmask,
4540         };
4541         struct nfs4_fs_locations_res res = {
4542                 .fs_locations = fs_locations,
4543         };
4544         struct rpc_message msg = {
4545                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4546                 .rpc_argp = &args,
4547                 .rpc_resp = &res,
4548         };
4549         int status;
4550
4551         dprintk("%s: start\n", __func__);
4552         nfs_fattr_init(&fs_locations->fattr);
4553         fs_locations->server = server;
4554         fs_locations->nlocations = 0;
4555         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4556         nfs_fixup_referral_attributes(&fs_locations->fattr);
4557         dprintk("%s: returned status = %d\n", __func__, status);
4558         return status;
4559 }
4560
4561 #ifdef CONFIG_NFS_V4_1
4562 /*
4563  * Check the exchange flags returned by the server for invalid flags, having
4564  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4565  * DS flags set.
4566  */
4567 static int nfs4_check_cl_exchange_flags(u32 flags)
4568 {
4569         if (flags & ~EXCHGID4_FLAG_MASK_R)
4570                 goto out_inval;
4571         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4572             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4573                 goto out_inval;
4574         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4575                 goto out_inval;
4576         return NFS_OK;
4577 out_inval:
4578         return -NFS4ERR_INVAL;
4579 }
4580
4581 /*
4582  * nfs4_proc_exchange_id()
4583  *
4584  * Since the clientid has expired, all compounds using sessions
4585  * associated with the stale clientid will be returning
4586  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4587  * be in some phase of session reset.
4588  */
4589 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4590 {
4591         nfs4_verifier verifier;
4592         struct nfs41_exchange_id_args args = {
4593                 .client = clp,
4594                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4595         };
4596         struct nfs41_exchange_id_res res = {
4597                 .client = clp,
4598         };
4599         int status;
4600         struct rpc_message msg = {
4601                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4602                 .rpc_argp = &args,
4603                 .rpc_resp = &res,
4604                 .rpc_cred = cred,
4605         };
4606         __be32 *p;
4607
4608         dprintk("--> %s\n", __func__);
4609         BUG_ON(clp == NULL);
4610
4611         p = (u32 *)verifier.data;
4612         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4613         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4614         args.verifier = &verifier;
4615
4616         args.id_len = scnprintf(args.id, sizeof(args.id),
4617                                 "%s/%s.%s/%u",
4618                                 clp->cl_ipaddr,
4619                                 init_utsname()->nodename,
4620                                 init_utsname()->domainname,
4621                                 clp->cl_rpcclient->cl_auth->au_flavor);
4622
4623         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4624         if (!status)
4625                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4626         dprintk("<-- %s status= %d\n", __func__, status);
4627         return status;
4628 }
4629
4630 struct nfs4_get_lease_time_data {
4631         struct nfs4_get_lease_time_args *args;
4632         struct nfs4_get_lease_time_res *res;
4633         struct nfs_client *clp;
4634 };
4635
4636 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4637                                         void *calldata)
4638 {
4639         int ret;
4640         struct nfs4_get_lease_time_data *data =
4641                         (struct nfs4_get_lease_time_data *)calldata;
4642
4643         dprintk("--> %s\n", __func__);
4644         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4645         /* just setup sequence, do not trigger session recovery
4646            since we're invoked within one */
4647         ret = nfs41_setup_sequence(data->clp->cl_session,
4648                                    &data->args->la_seq_args,
4649                                    &data->res->lr_seq_res, 0, task);
4650
4651         BUG_ON(ret == -EAGAIN);
4652         rpc_call_start(task);
4653         dprintk("<-- %s\n", __func__);
4654 }
4655
4656 /*
4657  * Called from nfs4_state_manager thread for session setup, so don't recover
4658  * from sequence operation or clientid errors.
4659  */
4660 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4661 {
4662         struct nfs4_get_lease_time_data *data =
4663                         (struct nfs4_get_lease_time_data *)calldata;
4664
4665         dprintk("--> %s\n", __func__);
4666         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4667                 return;
4668         switch (task->tk_status) {
4669         case -NFS4ERR_DELAY:
4670         case -NFS4ERR_GRACE:
4671                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4672                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4673                 task->tk_status = 0;
4674                 nfs_restart_rpc(task, data->clp);
4675                 return;
4676         }
4677         dprintk("<-- %s\n", __func__);
4678 }
4679
4680 struct rpc_call_ops nfs4_get_lease_time_ops = {
4681         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4682         .rpc_call_done = nfs4_get_lease_time_done,
4683 };
4684
4685 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4686 {
4687         struct rpc_task *task;
4688         struct nfs4_get_lease_time_args args;
4689         struct nfs4_get_lease_time_res res = {
4690                 .lr_fsinfo = fsinfo,
4691         };
4692         struct nfs4_get_lease_time_data data = {
4693                 .args = &args,
4694                 .res = &res,
4695                 .clp = clp,
4696         };
4697         struct rpc_message msg = {
4698                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4699                 .rpc_argp = &args,
4700                 .rpc_resp = &res,
4701         };
4702         struct rpc_task_setup task_setup = {
4703                 .rpc_client = clp->cl_rpcclient,
4704                 .rpc_message = &msg,
4705                 .callback_ops = &nfs4_get_lease_time_ops,
4706                 .callback_data = &data
4707         };
4708         int status;
4709
4710         dprintk("--> %s\n", __func__);
4711         task = rpc_run_task(&task_setup);
4712
4713         if (IS_ERR(task))
4714                 status = PTR_ERR(task);
4715         else {
4716                 status = task->tk_status;
4717                 rpc_put_task(task);
4718         }
4719         dprintk("<-- %s return %d\n", __func__, status);
4720
4721         return status;
4722 }
4723
4724 /*
4725  * Reset a slot table
4726  */
4727 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4728                                  int ivalue)
4729 {
4730         struct nfs4_slot *new = NULL;
4731         int i;
4732         int ret = 0;
4733
4734         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4735                 max_reqs, tbl->max_slots);
4736
4737         /* Does the newly negotiated max_reqs match the existing slot table? */
4738         if (max_reqs != tbl->max_slots) {
4739                 ret = -ENOMEM;
4740                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4741                               GFP_NOFS);
4742                 if (!new)
4743                         goto out;
4744                 ret = 0;
4745                 kfree(tbl->slots);
4746         }
4747         spin_lock(&tbl->slot_tbl_lock);
4748         if (new) {
4749                 tbl->slots = new;
4750                 tbl->max_slots = max_reqs;
4751         }
4752         for (i = 0; i < tbl->max_slots; ++i)
4753                 tbl->slots[i].seq_nr = ivalue;
4754         spin_unlock(&tbl->slot_tbl_lock);
4755         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4756                 tbl, tbl->slots, tbl->max_slots);
4757 out:
4758         dprintk("<-- %s: return %d\n", __func__, ret);
4759         return ret;
4760 }
4761
4762 /*
4763  * Reset the forechannel and backchannel slot tables
4764  */
4765 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4766 {
4767         int status;
4768
4769         status = nfs4_reset_slot_table(&session->fc_slot_table,
4770                         session->fc_attrs.max_reqs, 1);
4771         if (status)
4772                 return status;
4773
4774         status = nfs4_reset_slot_table(&session->bc_slot_table,
4775                         session->bc_attrs.max_reqs, 0);
4776         return status;
4777 }
4778
4779 /* Destroy the slot table */
4780 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4781 {
4782         if (session->fc_slot_table.slots != NULL) {
4783                 kfree(session->fc_slot_table.slots);
4784                 session->fc_slot_table.slots = NULL;
4785         }
4786         if (session->bc_slot_table.slots != NULL) {
4787                 kfree(session->bc_slot_table.slots);
4788                 session->bc_slot_table.slots = NULL;
4789         }
4790         return;
4791 }
4792
4793 /*
4794  * Initialize slot table
4795  */
4796 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4797                 int max_slots, int ivalue)
4798 {
4799         struct nfs4_slot *slot;
4800         int ret = -ENOMEM;
4801
4802         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4803
4804         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4805
4806         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4807         if (!slot)
4808                 goto out;
4809         ret = 0;
4810
4811         spin_lock(&tbl->slot_tbl_lock);
4812         tbl->max_slots = max_slots;
4813         tbl->slots = slot;
4814         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4815         spin_unlock(&tbl->slot_tbl_lock);
4816         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4817                 tbl, tbl->slots, tbl->max_slots);
4818 out:
4819         dprintk("<-- %s: return %d\n", __func__, ret);
4820         return ret;
4821 }
4822
4823 /*
4824  * Initialize the forechannel and backchannel tables
4825  */
4826 static int nfs4_init_slot_tables(struct nfs4_session *session)
4827 {
4828         struct nfs4_slot_table *tbl;
4829         int status = 0;
4830
4831         tbl = &session->fc_slot_table;
4832         if (tbl->slots == NULL) {
4833                 status = nfs4_init_slot_table(tbl,
4834                                 session->fc_attrs.max_reqs, 1);
4835                 if (status)
4836                         return status;
4837         }
4838
4839         tbl = &session->bc_slot_table;
4840         if (tbl->slots == NULL) {
4841                 status = nfs4_init_slot_table(tbl,
4842                                 session->bc_attrs.max_reqs, 0);
4843                 if (status)
4844                         nfs4_destroy_slot_tables(session);
4845         }
4846
4847         return status;
4848 }
4849
4850 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4851 {
4852         struct nfs4_session *session;
4853         struct nfs4_slot_table *tbl;
4854
4855         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4856         if (!session)
4857                 return NULL;
4858
4859         tbl = &session->fc_slot_table;
4860         tbl->highest_used_slotid = -1;
4861         spin_lock_init(&tbl->slot_tbl_lock);
4862         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4863         init_completion(&tbl->complete);
4864
4865         tbl = &session->bc_slot_table;
4866         tbl->highest_used_slotid = -1;
4867         spin_lock_init(&tbl->slot_tbl_lock);
4868         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4869         init_completion(&tbl->complete);
4870
4871         session->session_state = 1<<NFS4_SESSION_INITING;
4872
4873         session->clp = clp;
4874         return session;
4875 }
4876
4877 void nfs4_destroy_session(struct nfs4_session *session)
4878 {
4879         nfs4_proc_destroy_session(session);
4880         dprintk("%s Destroy backchannel for xprt %p\n",
4881                 __func__, session->clp->cl_rpcclient->cl_xprt);
4882         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4883                                 NFS41_BC_MIN_CALLBACKS);
4884         nfs4_destroy_slot_tables(session);
4885         kfree(session);
4886 }
4887
4888 /*
4889  * Initialize the values to be used by the client in CREATE_SESSION
4890  * If nfs4_init_session set the fore channel request and response sizes,
4891  * use them.
4892  *
4893  * Set the back channel max_resp_sz_cached to zero to force the client to
4894  * always set csa_cachethis to FALSE because the current implementation
4895  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4896  */
4897 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4898 {
4899         struct nfs4_session *session = args->client->cl_session;
4900         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4901                      mxresp_sz = session->fc_attrs.max_resp_sz;
4902
4903         if (mxrqst_sz == 0)
4904                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4905         if (mxresp_sz == 0)
4906                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4907         /* Fore channel attributes */
4908         args->fc_attrs.headerpadsz = 0;
4909         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4910         args->fc_attrs.max_resp_sz = mxresp_sz;
4911         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4912         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4913
4914         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4915                 "max_ops=%u max_reqs=%u\n",
4916                 __func__,
4917                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4918                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4919
4920         /* Back channel attributes */
4921         args->bc_attrs.headerpadsz = 0;
4922         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4923         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4924         args->bc_attrs.max_resp_sz_cached = 0;
4925         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4926         args->bc_attrs.max_reqs = 1;
4927
4928         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4929                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4930                 __func__,
4931                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4932                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4933                 args->bc_attrs.max_reqs);
4934 }
4935
4936 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4937 {
4938         struct nfs4_channel_attrs *sent = &args->fc_attrs;
4939         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
4940
4941         if (rcvd->headerpadsz > sent->headerpadsz)
4942                 return -EINVAL;
4943         if (rcvd->max_resp_sz > sent->max_resp_sz)
4944                 return -EINVAL;
4945         /*
4946          * Our requested max_ops is the minimum we need; we're not
4947          * prepared to break up compounds into smaller pieces than that.
4948          * So, no point even trying to continue if the server won't
4949          * cooperate:
4950          */
4951         if (rcvd->max_ops < sent->max_ops)
4952                 return -EINVAL;
4953         if (rcvd->max_reqs == 0)
4954                 return -EINVAL;
4955         return 0;
4956 }
4957
4958 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4959 {
4960         struct nfs4_channel_attrs *sent = &args->bc_attrs;
4961         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
4962
4963         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
4964                 return -EINVAL;
4965         if (rcvd->max_resp_sz < sent->max_resp_sz)
4966                 return -EINVAL;
4967         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
4968                 return -EINVAL;
4969         /* These would render the backchannel useless: */
4970         if (rcvd->max_ops  == 0)
4971                 return -EINVAL;
4972         if (rcvd->max_reqs == 0)
4973                 return -EINVAL;
4974         return 0;
4975 }
4976
4977 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4978                                      struct nfs4_session *session)
4979 {
4980         int ret;
4981
4982         ret = nfs4_verify_fore_channel_attrs(args, session);
4983         if (ret)
4984                 return ret;
4985         return nfs4_verify_back_channel_attrs(args, session);
4986 }
4987
4988 static int _nfs4_proc_create_session(struct nfs_client *clp)
4989 {
4990         struct nfs4_session *session = clp->cl_session;
4991         struct nfs41_create_session_args args = {
4992                 .client = clp,
4993                 .cb_program = NFS4_CALLBACK,
4994         };
4995         struct nfs41_create_session_res res = {
4996                 .client = clp,
4997         };
4998         struct rpc_message msg = {
4999                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5000                 .rpc_argp = &args,
5001                 .rpc_resp = &res,
5002         };
5003         int status;
5004
5005         nfs4_init_channel_attrs(&args);
5006         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5007
5008         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5009
5010         if (!status)
5011                 /* Verify the session's negotiated channel_attrs values */
5012                 status = nfs4_verify_channel_attrs(&args, session);
5013         if (!status) {
5014                 /* Increment the clientid slot sequence id */
5015                 clp->cl_seqid++;
5016         }
5017
5018         return status;
5019 }
5020
5021 /*
5022  * Issues a CREATE_SESSION operation to the server.
5023  * It is the responsibility of the caller to verify the session is
5024  * expired before calling this routine.
5025  */
5026 int nfs4_proc_create_session(struct nfs_client *clp)
5027 {
5028         int status;
5029         unsigned *ptr;
5030         struct nfs4_session *session = clp->cl_session;
5031         long timeout = 0;
5032         int err;
5033
5034         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5035
5036         do {
5037                 status = _nfs4_proc_create_session(clp);
5038                 if (status == -NFS4ERR_DELAY) {
5039                         err = nfs4_delay(clp->cl_rpcclient, &timeout);
5040                         if (err)
5041                                 status = err;
5042                 }
5043         } while (status == -NFS4ERR_DELAY);
5044
5045         if (status)
5046                 goto out;
5047
5048         /* Init and reset the fore channel */
5049         status = nfs4_init_slot_tables(session);
5050         dprintk("slot table initialization returned %d\n", status);
5051         if (status)
5052                 goto out;
5053         status = nfs4_reset_slot_tables(session);
5054         dprintk("slot table reset returned %d\n", status);
5055         if (status)
5056                 goto out;
5057
5058         ptr = (unsigned *)&session->sess_id.data[0];
5059         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5060                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5061 out:
5062         dprintk("<-- %s\n", __func__);
5063         return status;
5064 }
5065
5066 /*
5067  * Issue the over-the-wire RPC DESTROY_SESSION.
5068  * The caller must serialize access to this routine.
5069  */
5070 int nfs4_proc_destroy_session(struct nfs4_session *session)
5071 {
5072         int status = 0;
5073         struct rpc_message msg;
5074
5075         dprintk("--> nfs4_proc_destroy_session\n");
5076
5077         /* session is still being setup */
5078         if (session->clp->cl_cons_state != NFS_CS_READY)
5079                 return status;
5080
5081         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5082         msg.rpc_argp = session;
5083         msg.rpc_resp = NULL;
5084         msg.rpc_cred = NULL;
5085         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5086
5087         if (status)
5088                 printk(KERN_WARNING
5089                         "Got error %d from the server on DESTROY_SESSION. "
5090                         "Session has been destroyed regardless...\n", status);
5091
5092         dprintk("<-- nfs4_proc_destroy_session\n");
5093         return status;
5094 }
5095
5096 int nfs4_init_session(struct nfs_server *server)
5097 {
5098         struct nfs_client *clp = server->nfs_client;
5099         struct nfs4_session *session;
5100         unsigned int rsize, wsize;
5101         int ret;
5102
5103         if (!nfs4_has_session(clp))
5104                 return 0;
5105
5106         session = clp->cl_session;
5107         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5108                 return 0;
5109
5110         rsize = server->rsize;
5111         if (rsize == 0)
5112                 rsize = NFS_MAX_FILE_IO_SIZE;
5113         wsize = server->wsize;
5114         if (wsize == 0)
5115                 wsize = NFS_MAX_FILE_IO_SIZE;
5116
5117         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5118         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5119
5120         ret = nfs4_recover_expired_lease(server);
5121         if (!ret)
5122                 ret = nfs4_check_client_ready(clp);
5123         return ret;
5124 }
5125
5126 /*
5127  * Renew the cl_session lease.
5128  */
5129 struct nfs4_sequence_data {
5130         struct nfs_client *clp;
5131         struct nfs4_sequence_args args;
5132         struct nfs4_sequence_res res;
5133 };
5134
5135 static void nfs41_sequence_release(void *data)
5136 {
5137         struct nfs4_sequence_data *calldata = data;
5138         struct nfs_client *clp = calldata->clp;
5139
5140         if (atomic_read(&clp->cl_count) > 1)
5141                 nfs4_schedule_state_renewal(clp);
5142         nfs_put_client(clp);
5143         kfree(calldata);
5144 }
5145
5146 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5147 {
5148         switch(task->tk_status) {
5149         case -NFS4ERR_DELAY:
5150                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5151                 return -EAGAIN;
5152         default:
5153                 nfs4_schedule_state_recovery(clp);
5154         }
5155         return 0;
5156 }
5157
5158 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5159 {
5160         struct nfs4_sequence_data *calldata = data;
5161         struct nfs_client *clp = calldata->clp;
5162
5163         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5164                 return;
5165
5166         if (task->tk_status < 0) {
5167                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5168                 if (atomic_read(&clp->cl_count) == 1)
5169                         goto out;
5170
5171                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5172                         rpc_restart_call_prepare(task);
5173                         return;
5174                 }
5175         }
5176         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5177 out:
5178         dprintk("<-- %s\n", __func__);
5179 }
5180
5181 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5182 {
5183         struct nfs4_sequence_data *calldata = data;
5184         struct nfs_client *clp = calldata->clp;
5185         struct nfs4_sequence_args *args;
5186         struct nfs4_sequence_res *res;
5187
5188         args = task->tk_msg.rpc_argp;
5189         res = task->tk_msg.rpc_resp;
5190
5191         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5192                 return;
5193         rpc_call_start(task);
5194 }
5195
5196 static const struct rpc_call_ops nfs41_sequence_ops = {
5197         .rpc_call_done = nfs41_sequence_call_done,
5198         .rpc_call_prepare = nfs41_sequence_prepare,
5199         .rpc_release = nfs41_sequence_release,
5200 };
5201
5202 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5203 {
5204         struct nfs4_sequence_data *calldata;
5205         struct rpc_message msg = {
5206                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5207                 .rpc_cred = cred,
5208         };
5209         struct rpc_task_setup task_setup_data = {
5210                 .rpc_client = clp->cl_rpcclient,
5211                 .rpc_message = &msg,
5212                 .callback_ops = &nfs41_sequence_ops,
5213                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5214         };
5215
5216         if (!atomic_inc_not_zero(&clp->cl_count))
5217                 return ERR_PTR(-EIO);
5218         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5219         if (calldata == NULL) {
5220                 nfs_put_client(clp);
5221                 return ERR_PTR(-ENOMEM);
5222         }
5223         msg.rpc_argp = &calldata->args;
5224         msg.rpc_resp = &calldata->res;
5225         calldata->clp = clp;
5226         task_setup_data.callback_data = calldata;
5227
5228         return rpc_run_task(&task_setup_data);
5229 }
5230
5231 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5232 {
5233         struct rpc_task *task;
5234         int ret = 0;
5235
5236         task = _nfs41_proc_sequence(clp, cred);
5237         if (IS_ERR(task))
5238                 ret = PTR_ERR(task);
5239         else
5240                 rpc_put_task_async(task);
5241         dprintk("<-- %s status=%d\n", __func__, ret);
5242         return ret;
5243 }
5244
5245 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5246 {
5247         struct rpc_task *task;
5248         int ret;
5249
5250         task = _nfs41_proc_sequence(clp, cred);
5251         if (IS_ERR(task)) {
5252                 ret = PTR_ERR(task);
5253                 goto out;
5254         }
5255         ret = rpc_wait_for_completion_task(task);
5256         if (!ret)
5257                 ret = task->tk_status;
5258         rpc_put_task(task);
5259 out:
5260         dprintk("<-- %s status=%d\n", __func__, ret);
5261         return ret;
5262 }
5263
5264 struct nfs4_reclaim_complete_data {
5265         struct nfs_client *clp;
5266         struct nfs41_reclaim_complete_args arg;
5267         struct nfs41_reclaim_complete_res res;
5268 };
5269
5270 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5271 {
5272         struct nfs4_reclaim_complete_data *calldata = data;
5273
5274         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5275         if (nfs41_setup_sequence(calldata->clp->cl_session,
5276                                 &calldata->arg.seq_args,
5277                                 &calldata->res.seq_res, 0, task))
5278                 return;
5279
5280         rpc_call_start(task);
5281 }
5282
5283 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5284 {
5285         switch(task->tk_status) {
5286         case 0:
5287         case -NFS4ERR_COMPLETE_ALREADY:
5288         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5289                 break;
5290         case -NFS4ERR_DELAY:
5291                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5292                 return -EAGAIN;
5293         default:
5294                 nfs4_schedule_state_recovery(clp);
5295         }
5296         return 0;
5297 }
5298
5299 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5300 {
5301         struct nfs4_reclaim_complete_data *calldata = data;
5302         struct nfs_client *clp = calldata->clp;
5303         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5304
5305         dprintk("--> %s\n", __func__);
5306         if (!nfs41_sequence_done(task, res))
5307                 return;
5308
5309         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5310                 rpc_restart_call_prepare(task);
5311                 return;
5312         }
5313         dprintk("<-- %s\n", __func__);
5314 }
5315
5316 static void nfs4_free_reclaim_complete_data(void *data)
5317 {
5318         struct nfs4_reclaim_complete_data *calldata = data;
5319
5320         kfree(calldata);
5321 }
5322
5323 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5324         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5325         .rpc_call_done = nfs4_reclaim_complete_done,
5326         .rpc_release = nfs4_free_reclaim_complete_data,
5327 };
5328
5329 /*
5330  * Issue a global reclaim complete.
5331  */
5332 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5333 {
5334         struct nfs4_reclaim_complete_data *calldata;
5335         struct rpc_task *task;
5336         struct rpc_message msg = {
5337                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5338         };
5339         struct rpc_task_setup task_setup_data = {
5340                 .rpc_client = clp->cl_rpcclient,
5341                 .rpc_message = &msg,
5342                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5343                 .flags = RPC_TASK_ASYNC,
5344         };
5345         int status = -ENOMEM;
5346
5347         dprintk("--> %s\n", __func__);
5348         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5349         if (calldata == NULL)
5350                 goto out;
5351         calldata->clp = clp;
5352         calldata->arg.one_fs = 0;
5353
5354         msg.rpc_argp = &calldata->arg;
5355         msg.rpc_resp = &calldata->res;
5356         task_setup_data.callback_data = calldata;
5357         task = rpc_run_task(&task_setup_data);
5358         if (IS_ERR(task)) {
5359                 status = PTR_ERR(task);
5360                 goto out;
5361         }
5362         status = nfs4_wait_for_completion_rpc_task(task);
5363         if (status == 0)
5364                 status = task->tk_status;
5365         rpc_put_task(task);
5366         return 0;
5367 out:
5368         dprintk("<-- %s status=%d\n", __func__, status);
5369         return status;
5370 }
5371
5372 static void
5373 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5374 {
5375         struct nfs4_layoutget *lgp = calldata;
5376         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5377
5378         dprintk("--> %s\n", __func__);
5379         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5380          * right now covering the LAYOUTGET we are about to send.
5381          * However, that is not so catastrophic, and there seems
5382          * to be no way to prevent it completely.
5383          */
5384         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5385                                 &lgp->res.seq_res, 0, task))
5386                 return;
5387         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5388                                           NFS_I(lgp->args.inode)->layout,
5389                                           lgp->args.ctx->state)) {
5390                 rpc_exit(task, NFS4_OK);
5391                 return;
5392         }
5393         rpc_call_start(task);
5394 }
5395
5396 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5397 {
5398         struct nfs4_layoutget *lgp = calldata;
5399         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5400
5401         dprintk("--> %s\n", __func__);
5402
5403         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5404                 return;
5405
5406         switch (task->tk_status) {
5407         case 0:
5408                 break;
5409         case -NFS4ERR_LAYOUTTRYLATER:
5410         case -NFS4ERR_RECALLCONFLICT:
5411                 task->tk_status = -NFS4ERR_DELAY;
5412                 /* Fall through */
5413         default:
5414                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5415                         rpc_restart_call_prepare(task);
5416                         return;
5417                 }
5418         }
5419         dprintk("<-- %s\n", __func__);
5420 }
5421
5422 static void nfs4_layoutget_release(void *calldata)
5423 {
5424         struct nfs4_layoutget *lgp = calldata;
5425
5426         dprintk("--> %s\n", __func__);
5427         if (lgp->res.layout.buf != NULL)
5428                 free_page((unsigned long) lgp->res.layout.buf);
5429         put_nfs_open_context(lgp->args.ctx);
5430         kfree(calldata);
5431         dprintk("<-- %s\n", __func__);
5432 }
5433
5434 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5435         .rpc_call_prepare = nfs4_layoutget_prepare,
5436         .rpc_call_done = nfs4_layoutget_done,
5437         .rpc_release = nfs4_layoutget_release,
5438 };
5439
5440 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5441 {
5442         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5443         struct rpc_task *task;
5444         struct rpc_message msg = {
5445                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5446                 .rpc_argp = &lgp->args,
5447                 .rpc_resp = &lgp->res,
5448         };
5449         struct rpc_task_setup task_setup_data = {
5450                 .rpc_client = server->client,
5451                 .rpc_message = &msg,
5452                 .callback_ops = &nfs4_layoutget_call_ops,
5453                 .callback_data = lgp,
5454                 .flags = RPC_TASK_ASYNC,
5455         };
5456         int status = 0;
5457
5458         dprintk("--> %s\n", __func__);
5459
5460         lgp->res.layout.buf = (void *)__get_free_page(GFP_NOFS);
5461         if (lgp->res.layout.buf == NULL) {
5462                 nfs4_layoutget_release(lgp);
5463                 return -ENOMEM;
5464         }
5465
5466         lgp->res.seq_res.sr_slot = NULL;
5467         task = rpc_run_task(&task_setup_data);
5468         if (IS_ERR(task))
5469                 return PTR_ERR(task);
5470         status = nfs4_wait_for_completion_rpc_task(task);
5471         if (status == 0)
5472                 status = task->tk_status;
5473         if (status == 0)
5474                 status = pnfs_layout_process(lgp);
5475         rpc_put_task(task);
5476         dprintk("<-- %s status=%d\n", __func__, status);
5477         return status;
5478 }
5479
5480 static int
5481 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5482 {
5483         struct nfs4_getdeviceinfo_args args = {
5484                 .pdev = pdev,
5485         };
5486         struct nfs4_getdeviceinfo_res res = {
5487                 .pdev = pdev,
5488         };
5489         struct rpc_message msg = {
5490                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5491                 .rpc_argp = &args,
5492                 .rpc_resp = &res,
5493         };
5494         int status;
5495
5496         dprintk("--> %s\n", __func__);
5497         status = nfs4_call_sync(server, &msg, &args, &res, 0);
5498         dprintk("<-- %s status=%d\n", __func__, status);
5499
5500         return status;
5501 }
5502
5503 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5504 {
5505         struct nfs4_exception exception = { };
5506         int err;
5507
5508         do {
5509                 err = nfs4_handle_exception(server,
5510                                         _nfs4_proc_getdeviceinfo(server, pdev),
5511                                         &exception);
5512         } while (exception.retry);
5513         return err;
5514 }
5515 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5516
5517 #endif /* CONFIG_NFS_V4_1 */
5518
5519 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5520         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5521         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5522         .recover_open   = nfs4_open_reclaim,
5523         .recover_lock   = nfs4_lock_reclaim,
5524         .establish_clid = nfs4_init_clientid,
5525         .get_clid_cred  = nfs4_get_setclientid_cred,
5526 };
5527
5528 #if defined(CONFIG_NFS_V4_1)
5529 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5530         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5531         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5532         .recover_open   = nfs4_open_reclaim,
5533         .recover_lock   = nfs4_lock_reclaim,
5534         .establish_clid = nfs41_init_clientid,
5535         .get_clid_cred  = nfs4_get_exchange_id_cred,
5536         .reclaim_complete = nfs41_proc_reclaim_complete,
5537 };
5538 #endif /* CONFIG_NFS_V4_1 */
5539
5540 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5541         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5542         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5543         .recover_open   = nfs4_open_expired,
5544         .recover_lock   = nfs4_lock_expired,
5545         .establish_clid = nfs4_init_clientid,
5546         .get_clid_cred  = nfs4_get_setclientid_cred,
5547 };
5548
5549 #if defined(CONFIG_NFS_V4_1)
5550 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5551         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5552         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5553         .recover_open   = nfs4_open_expired,
5554         .recover_lock   = nfs4_lock_expired,
5555         .establish_clid = nfs41_init_clientid,
5556         .get_clid_cred  = nfs4_get_exchange_id_cred,
5557 };
5558 #endif /* CONFIG_NFS_V4_1 */
5559
5560 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5561         .sched_state_renewal = nfs4_proc_async_renew,
5562         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5563         .renew_lease = nfs4_proc_renew,
5564 };
5565
5566 #if defined(CONFIG_NFS_V4_1)
5567 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5568         .sched_state_renewal = nfs41_proc_async_sequence,
5569         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5570         .renew_lease = nfs4_proc_sequence,
5571 };
5572 #endif
5573
5574 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5575         .minor_version = 0,
5576         .call_sync = _nfs4_call_sync,
5577         .validate_stateid = nfs4_validate_delegation_stateid,
5578         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5579         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5580         .state_renewal_ops = &nfs40_state_renewal_ops,
5581 };
5582
5583 #if defined(CONFIG_NFS_V4_1)
5584 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5585         .minor_version = 1,
5586         .call_sync = _nfs4_call_sync_session,
5587         .validate_stateid = nfs41_validate_delegation_stateid,
5588         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5589         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5590         .state_renewal_ops = &nfs41_state_renewal_ops,
5591 };
5592 #endif
5593
5594 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5595         [0] = &nfs_v4_0_minor_ops,
5596 #if defined(CONFIG_NFS_V4_1)
5597         [1] = &nfs_v4_1_minor_ops,
5598 #endif
5599 };
5600
5601 static const struct inode_operations nfs4_file_inode_operations = {
5602         .permission     = nfs_permission,
5603         .getattr        = nfs_getattr,
5604         .setattr        = nfs_setattr,
5605         .getxattr       = generic_getxattr,
5606         .setxattr       = generic_setxattr,
5607         .listxattr      = generic_listxattr,
5608         .removexattr    = generic_removexattr,
5609 };
5610
5611 const struct nfs_rpc_ops nfs_v4_clientops = {
5612         .version        = 4,                    /* protocol version */
5613         .dentry_ops     = &nfs4_dentry_operations,
5614         .dir_inode_ops  = &nfs4_dir_inode_operations,
5615         .file_inode_ops = &nfs4_file_inode_operations,
5616         .getroot        = nfs4_proc_get_root,
5617         .getattr        = nfs4_proc_getattr,
5618         .setattr        = nfs4_proc_setattr,
5619         .lookupfh       = nfs4_proc_lookupfh,
5620         .lookup         = nfs4_proc_lookup,
5621         .access         = nfs4_proc_access,
5622         .readlink       = nfs4_proc_readlink,
5623         .create         = nfs4_proc_create,
5624         .remove         = nfs4_proc_remove,
5625         .unlink_setup   = nfs4_proc_unlink_setup,
5626         .unlink_done    = nfs4_proc_unlink_done,
5627         .rename         = nfs4_proc_rename,
5628         .rename_setup   = nfs4_proc_rename_setup,
5629         .rename_done    = nfs4_proc_rename_done,
5630         .link           = nfs4_proc_link,
5631         .symlink        = nfs4_proc_symlink,
5632         .mkdir          = nfs4_proc_mkdir,
5633         .rmdir          = nfs4_proc_remove,
5634         .readdir        = nfs4_proc_readdir,
5635         .mknod          = nfs4_proc_mknod,
5636         .statfs         = nfs4_proc_statfs,
5637         .fsinfo         = nfs4_proc_fsinfo,
5638         .pathconf       = nfs4_proc_pathconf,
5639         .set_capabilities = nfs4_server_capabilities,
5640         .decode_dirent  = nfs4_decode_dirent,
5641         .read_setup     = nfs4_proc_read_setup,
5642         .read_done      = nfs4_read_done,
5643         .write_setup    = nfs4_proc_write_setup,
5644         .write_done     = nfs4_write_done,
5645         .commit_setup   = nfs4_proc_commit_setup,
5646         .commit_done    = nfs4_commit_done,
5647         .lock           = nfs4_proc_lock,
5648         .clear_acl_cache = nfs4_zap_acl_attr,
5649         .close_context  = nfs4_close_context,
5650         .open_context   = nfs4_atomic_open,
5651 };
5652
5653 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
5654         .prefix = XATTR_NAME_NFSV4_ACL,
5655         .list   = nfs4_xattr_list_nfs4_acl,
5656         .get    = nfs4_xattr_get_nfs4_acl,
5657         .set    = nfs4_xattr_set_nfs4_acl,
5658 };
5659
5660 const struct xattr_handler *nfs4_xattr_handlers[] = {
5661         &nfs4_xattr_nfs4_acl_handler,
5662         NULL
5663 };
5664
5665 /*
5666  * Local variables:
5667  *  c-basic-offset: 8
5668  * End:
5669  */