fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/namei.h>
  49 #include <linux/mount.h>
  50 #include <linux/module.h>
  51 #include <linux/sunrpc/bc_xprt.h>
  52
  53 #include "nfs4_fs.h"
  54 #include "delegation.h"
  55 #include "internal.h"
  56 #include "iostat.h"
  57 #include "callback.h"
  58
  59 #define NFSDBG_FACILITY         NFSDBG_PROC
  60
  61 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  62 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  63
  64 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  65
  66 struct nfs4_opendata;
  67 static int _nfs4_proc_open(struct nfs4_opendata *data);
  68 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  69 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  70 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  71 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  72 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  73 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  74                             struct nfs_fattr *fattr, struct iattr *sattr,
  75                             struct nfs4_state *state);
  76
  77 /* Prevent leaks of NFSv4 errors into userland */
  78 static int nfs4_map_errors(int err)
  79 {
  80         if (err >= -1000)
  81                 return err;
  82         switch (err) {
  83         case -NFS4ERR_RESOURCE:
  84                 return -EREMOTEIO;
  85         default:
  86                 dprintk("%s could not handle NFSv4 error %d\n",
  87                                 __func__, -err);
  88                 break;
  89         }
  90         return -EIO;
  91 }
  92
  93 /*
  94  * This is our standard bitmap for GETATTR requests.
  95  */
  96 const u32 nfs4_fattr_bitmap[2] = {
  97         FATTR4_WORD0_TYPE
  98         | FATTR4_WORD0_CHANGE
  99         | FATTR4_WORD0_SIZE
 100         | FATTR4_WORD0_FSID
 101         | FATTR4_WORD0_FILEID,
 102         FATTR4_WORD1_MODE
 103         | FATTR4_WORD1_NUMLINKS
 104         | FATTR4_WORD1_OWNER
 105         | FATTR4_WORD1_OWNER_GROUP
 106         | FATTR4_WORD1_RAWDEV
 107         | FATTR4_WORD1_SPACE_USED
 108         | FATTR4_WORD1_TIME_ACCESS
 109         | FATTR4_WORD1_TIME_METADATA
 110         | FATTR4_WORD1_TIME_MODIFY
 111 };
 112
 113 const u32 nfs4_statfs_bitmap[2] = {
 114         FATTR4_WORD0_FILES_AVAIL
 115         | FATTR4_WORD0_FILES_FREE
 116         | FATTR4_WORD0_FILES_TOTAL,
 117         FATTR4_WORD1_SPACE_AVAIL
 118         | FATTR4_WORD1_SPACE_FREE
 119         | FATTR4_WORD1_SPACE_TOTAL
 120 };
 121
 122 const u32 nfs4_pathconf_bitmap[2] = {
 123         FATTR4_WORD0_MAXLINK
 124         | FATTR4_WORD0_MAXNAME,
 125         0
 126 };
 127
 128 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 129                         | FATTR4_WORD0_MAXREAD
 130                         | FATTR4_WORD0_MAXWRITE
 131                         | FATTR4_WORD0_LEASE_TIME,
 132                         0
 133 };
 134
 135 const u32 nfs4_fs_locations_bitmap[2] = {
 136         FATTR4_WORD0_TYPE
 137         | FATTR4_WORD0_CHANGE
 138         | FATTR4_WORD0_SIZE
 139         | FATTR4_WORD0_FSID
 140         | FATTR4_WORD0_FILEID
 141         | FATTR4_WORD0_FS_LOCATIONS,
 142         FATTR4_WORD1_MODE
 143         | FATTR4_WORD1_NUMLINKS
 144         | FATTR4_WORD1_OWNER
 145         | FATTR4_WORD1_OWNER_GROUP
 146         | FATTR4_WORD1_RAWDEV
 147         | FATTR4_WORD1_SPACE_USED
 148         | FATTR4_WORD1_TIME_ACCESS
 149         | FATTR4_WORD1_TIME_METADATA
 150         | FATTR4_WORD1_TIME_MODIFY
 151         | FATTR4_WORD1_MOUNTED_ON_FILEID
 152 };
 153
 154 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 155                 struct nfs4_readdir_arg *readdir)
 156 {
 157         __be32 *start, *p;
 158
 159         BUG_ON(readdir->count < 80);
 160         if (cookie > 2) {
 161                 readdir->cookie = cookie;
 162                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 163                 return;
 164         }
 165
 166         readdir->cookie = 0;
 167         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 168         if (cookie == 2)
 169                 return;
 170
 171         /*
 172          * NFSv4 servers do not return entries for '.' and '..'
 173          * Therefore, we fake these entries here.  We let '.'
 174          * have cookie 0 and '..' have cookie 1.  Note that
 175          * when talking to the server, we always send cookie 0
 176          * instead of 1 or 2.
 177          */
 178         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 179
 180         if (cookie == 0) {
 181                 *p++ = xdr_one;                                  /* next */
 182                 *p++ = xdr_zero;                   /* cookie, first word */
 183                 *p++ = xdr_one;                   /* cookie, second word */
 184                 *p++ = xdr_one;                             /* entry len */
 185                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 186                 p++;
 187                 *p++ = xdr_one;                         /* bitmap length */
 188                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189                 *p++ = htonl(8);              /* attribute buffer length */
 190                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 191         }
 192
 193         *p++ = xdr_one;                                  /* next */
 194         *p++ = xdr_zero;                   /* cookie, first word */
 195         *p++ = xdr_two;                   /* cookie, second word */
 196         *p++ = xdr_two;                             /* entry len */
 197         memcpy(p, "..\0\0", 4);                         /* entry */
 198         p++;
 199         *p++ = xdr_one;                         /* bitmap length */
 200         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 201         *p++ = htonl(8);              /* attribute buffer length */
 202         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 203
 204         readdir->pgbase = (char *)p - (char *)start;
 205         readdir->count -= readdir->pgbase;
 206         kunmap_atomic(start, KM_USER0);
 207 }
 208
 209 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 210 {
 211         int res;
 212
 213         might_sleep();
 214
 215         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 216                         nfs_wait_bit_killable, TASK_KILLABLE);
 217         return res;
 218 }
 219
 220 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 221 {
 222         int res = 0;
 223
 224         might_sleep();
 225
 226         if (*timeout <= 0)
 227                 *timeout = NFS4_POLL_RETRY_MIN;
 228         if (*timeout > NFS4_POLL_RETRY_MAX)
 229                 *timeout = NFS4_POLL_RETRY_MAX;
 230         schedule_timeout_killable(*timeout);
 231         if (fatal_signal_pending(current))
 232                 res = -ERESTARTSYS;
 233         *timeout <<= 1;
 234         return res;
 235 }
 236
 237 /* This is the error handling routine for processes that are allowed
 238  * to sleep.
 239  */
 240 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 241 {
 242         struct nfs_client *clp = server->nfs_client;
 243         struct nfs4_state *state = exception->state;
 244         int ret = errorcode;
 245
 246         exception->retry = 0;
 247         switch(errorcode) {
 248                 case 0:
 249                         return 0;
 250                 case -NFS4ERR_ADMIN_REVOKED:
 251                 case -NFS4ERR_BAD_STATEID:
 252                 case -NFS4ERR_OPENMODE:
 253                         if (state == NULL)
 254                                 break;
 255                         nfs4_state_mark_reclaim_nograce(clp, state);
 256                         goto do_state_recovery;
 257                 case -NFS4ERR_STALE_STATEID:
 258                         if (state == NULL)
 259                                 break;
 260                         nfs4_state_mark_reclaim_reboot(clp, state);
 261                 case -NFS4ERR_STALE_CLIENTID:
 262                 case -NFS4ERR_EXPIRED:
 263                         goto do_state_recovery;
 264 #if defined(CONFIG_NFS_V4_1)
 265                 case -NFS4ERR_BADSESSION:
 266                 case -NFS4ERR_BADSLOT:
 267                 case -NFS4ERR_BAD_HIGH_SLOT:
 268                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 269                 case -NFS4ERR_DEADSESSION:
 270                 case -NFS4ERR_SEQ_FALSE_RETRY:
 271                 case -NFS4ERR_SEQ_MISORDERED:
 272                         dprintk("%s ERROR: %d Reset session\n", __func__,
 273                                 errorcode);
 274                         nfs4_schedule_state_recovery(clp);
 275                         exception->retry = 1;
 276                         break;
 277 #endif /* defined(CONFIG_NFS_V4_1) */
 278                 case -NFS4ERR_FILE_OPEN:
 279                         if (exception->timeout > HZ) {
 280                                 /* We have retried a decent amount, time to
 281                                  * fail
 282                                  */
 283                                 ret = -EBUSY;
 284                                 break;
 285                         }
 286                 case -NFS4ERR_GRACE:
 287                 case -NFS4ERR_DELAY:
 288                 case -EKEYEXPIRED:
 289                         ret = nfs4_delay(server->client, &exception->timeout);
 290                         if (ret != 0)
 291                                 break;
 292                 case -NFS4ERR_OLD_STATEID:
 293                         exception->retry = 1;
 294         }
 295         /* We failed to handle the error */
 296         return nfs4_map_errors(ret);
 297 do_state_recovery:
 298         nfs4_schedule_state_recovery(clp);
 299         ret = nfs4_wait_clnt_recover(clp);
 300         if (ret == 0)
 301                 exception->retry = 1;
 302         return ret;
 303 }
 304
 305
 306 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 307 {
 308         struct nfs_client *clp = server->nfs_client;
 309         spin_lock(&clp->cl_lock);
 310         if (time_before(clp->cl_last_renewal,timestamp))
 311                 clp->cl_last_renewal = timestamp;
 312         spin_unlock(&clp->cl_lock);
 313 }
 314
 315 #if defined(CONFIG_NFS_V4_1)
 316
 317 /*
 318  * nfs4_free_slot - free a slot and efficiently update slot table.
 319  *
 320  * freeing a slot is trivially done by clearing its respective bit
 321  * in the bitmap.
 322  * If the freed slotid equals highest_used_slotid we want to update it
 323  * so that the server would be able to size down the slot table if needed,
 324  * otherwise we know that the highest_used_slotid is still in use.
 325  * When updating highest_used_slotid there may be "holes" in the bitmap
 326  * so we need to scan down from highest_used_slotid to 0 looking for the now
 327  * highest slotid in use.
 328  * If none found, highest_used_slotid is set to -1.
 329  *
 330  * Must be called while holding tbl->slot_tbl_lock
 331  */
 332 static void
 333 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 334 {
 335         int slotid = free_slotid;
 336
 337         /* clear used bit in bitmap */
 338         __clear_bit(slotid, tbl->used_slots);
 339
 340         /* update highest_used_slotid when it is freed */
 341         if (slotid == tbl->highest_used_slotid) {
 342                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 343                 if (slotid < tbl->max_slots)
 344                         tbl->highest_used_slotid = slotid;
 345                 else
 346                         tbl->highest_used_slotid = -1;
 347         }
 348         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 349                 free_slotid, tbl->highest_used_slotid);
 350 }
 351
 352 /*
 353  * Signal state manager thread if session is drained
 354  */
 355 static void nfs41_check_drain_session_complete(struct nfs4_session *ses)
 356 {
 357         struct rpc_task *task;
 358
 359         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 360                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 361                 if (task)
 362                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 363                 return;
 364         }
 365
 366         if (ses->fc_slot_table.highest_used_slotid != -1)
 367                 return;
 368
 369         dprintk("%s COMPLETE: Session Drained\n", __func__);
 370         complete(&ses->complete);
 371 }
 372
 373 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 374 {
 375         struct nfs4_slot_table *tbl;
 376
 377         tbl = &res->sr_session->fc_slot_table;
 378         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
 379                 /* just wake up the next guy waiting since
 380                  * we may have not consumed a slot after all */
 381                 dprintk("%s: No slot\n", __func__);
 382                 return;
 383         }
 384
 385         spin_lock(&tbl->slot_tbl_lock);
 386         nfs4_free_slot(tbl, res->sr_slotid);
 387         nfs41_check_drain_session_complete(res->sr_session);
 388         spin_unlock(&tbl->slot_tbl_lock);
 389         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 390 }
 391
 392 static void nfs41_sequence_done(struct nfs4_sequence_res *res)
 393 {
 394         unsigned long timestamp;
 395         struct nfs4_slot_table *tbl;
 396         struct nfs4_slot *slot;
 397
 398         /*
 399          * sr_status remains 1 if an RPC level error occurred. The server
 400          * may or may not have processed the sequence operation..
 401          * Proceed as if the server received and processed the sequence
 402          * operation.
 403          */
 404         if (res->sr_status == 1)
 405                 res->sr_status = NFS_OK;
 406
 407         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 408         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
 409                 goto out;
 410
 411         /* Check the SEQUENCE operation status */
 412         if (res->sr_status == 0) {
 413                 struct nfs_client *clp = res->sr_session->clp;
 414                 tbl = &res->sr_session->fc_slot_table;
 415                 slot = tbl->slots + res->sr_slotid;
 416                 /* Update the slot's sequence and clientid lease timer */
 417                 ++slot->seq_nr;
 418                 timestamp = res->sr_renewal_time;
 419                 spin_lock(&clp->cl_lock);
 420                 if (time_before(clp->cl_last_renewal, timestamp))
 421                         clp->cl_last_renewal = timestamp;
 422                 spin_unlock(&clp->cl_lock);
 423                 /* Check sequence flags */
 424                 if (atomic_read(&clp->cl_count) > 1)
 425                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 426         }
 427 out:
 428         /* The session may be reset by one of the error handlers. */
 429         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 430         nfs41_sequence_free_slot(res);
 431 }
 432
 433 static void nfs4_sequence_done(const struct nfs_server *server,
 434                                struct nfs4_sequence_res *res, int rpc_status)
 435 {
 436         if (res->sr_session != NULL)
 437                 nfs41_sequence_done(res);
 438 }
 439
 440 /*
 441  * nfs4_find_slot - efficiently look for a free slot
 442  *
 443  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 444  * If found, we mark the slot as used, update the highest_used_slotid,
 445  * and respectively set up the sequence operation args.
 446  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 447  *
 448  * Note: must be called with under the slot_tbl_lock.
 449  */
 450 static u8
 451 nfs4_find_slot(struct nfs4_slot_table *tbl)
 452 {
 453         int slotid;
 454         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 455         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 456
 457         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 458                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 459                 tbl->max_slots);
 460         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 461         if (slotid >= tbl->max_slots)
 462                 goto out;
 463         __set_bit(slotid, tbl->used_slots);
 464         if (slotid > tbl->highest_used_slotid)
 465                 tbl->highest_used_slotid = slotid;
 466         ret_id = slotid;
 467 out:
 468         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 469                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 470         return ret_id;
 471 }
 472
 473 static int nfs41_setup_sequence(struct nfs4_session *session,
 474                                 struct nfs4_sequence_args *args,
 475                                 struct nfs4_sequence_res *res,
 476                                 int cache_reply,
 477                                 struct rpc_task *task)
 478 {
 479         struct nfs4_slot *slot;
 480         struct nfs4_slot_table *tbl;
 481         u8 slotid;
 482
 483         dprintk("--> %s\n", __func__);
 484         /* slot already allocated? */
 485         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
 486                 return 0;
 487
 488         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 489         tbl = &session->fc_slot_table;
 490
 491         spin_lock(&tbl->slot_tbl_lock);
 492         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 493             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 494                 /*
 495                  * The state manager will wait until the slot table is empty.
 496                  * Schedule the reset thread
 497                  */
 498                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 499                 spin_unlock(&tbl->slot_tbl_lock);
 500                 dprintk("%s Schedule Session Reset\n", __func__);
 501                 return -EAGAIN;
 502         }
 503
 504         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 505             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 506                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 507                 spin_unlock(&tbl->slot_tbl_lock);
 508                 dprintk("%s enforce FIFO order\n", __func__);
 509                 return -EAGAIN;
 510         }
 511
 512         slotid = nfs4_find_slot(tbl);
 513         if (slotid == NFS4_MAX_SLOT_TABLE) {
 514                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 515                 spin_unlock(&tbl->slot_tbl_lock);
 516                 dprintk("<-- %s: no free slots\n", __func__);
 517                 return -EAGAIN;
 518         }
 519         spin_unlock(&tbl->slot_tbl_lock);
 520
 521         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 522         slot = tbl->slots + slotid;
 523         args->sa_session = session;
 524         args->sa_slotid = slotid;
 525         args->sa_cache_this = cache_reply;
 526
 527         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 528
 529         res->sr_session = session;
 530         res->sr_slotid = slotid;
 531         res->sr_renewal_time = jiffies;
 532         res->sr_status_flags = 0;
 533         /*
 534          * sr_status is only set in decode_sequence, and so will remain
 535          * set to 1 if an rpc level failure occurs.
 536          */
 537         res->sr_status = 1;
 538         return 0;
 539 }
 540
 541 int nfs4_setup_sequence(const struct nfs_server *server,
 542                         struct nfs4_sequence_args *args,
 543                         struct nfs4_sequence_res *res,
 544                         int cache_reply,
 545                         struct rpc_task *task)
 546 {
 547         struct nfs4_session *session = nfs4_get_session(server);
 548         int ret = 0;
 549
 550         if (session == NULL) {
 551                 args->sa_session = NULL;
 552                 res->sr_session = NULL;
 553                 goto out;
 554         }
 555
 556         dprintk("--> %s clp %p session %p sr_slotid %d\n",
 557                 __func__, session->clp, session, res->sr_slotid);
 558
 559         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 560                                    task);
 561 out:
 562         dprintk("<-- %s status=%d\n", __func__, ret);
 563         return ret;
 564 }
 565
 566 struct nfs41_call_sync_data {
 567         const struct nfs_server *seq_server;
 568         struct nfs4_sequence_args *seq_args;
 569         struct nfs4_sequence_res *seq_res;
 570         int cache_reply;
 571 };
 572
 573 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 574 {
 575         struct nfs41_call_sync_data *data = calldata;
 576
 577         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 578
 579         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 580                                 data->seq_res, data->cache_reply, task))
 581                 return;
 582         rpc_call_start(task);
 583 }
 584
 585 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 586 {
 587         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 588         nfs41_call_sync_prepare(task, calldata);
 589 }
 590
 591 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 592 {
 593         struct nfs41_call_sync_data *data = calldata;
 594
 595         nfs41_sequence_done(data->seq_res);
 596 }
 597
 598 struct rpc_call_ops nfs41_call_sync_ops = {
 599         .rpc_call_prepare = nfs41_call_sync_prepare,
 600         .rpc_call_done = nfs41_call_sync_done,
 601 };
 602
 603 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 604         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 605         .rpc_call_done = nfs41_call_sync_done,
 606 };
 607
 608 static int nfs4_call_sync_sequence(struct nfs_server *server,
 609                                    struct rpc_message *msg,
 610                                    struct nfs4_sequence_args *args,
 611                                    struct nfs4_sequence_res *res,
 612                                    int cache_reply,
 613                                    int privileged)
 614 {
 615         int ret;
 616         struct rpc_task *task;
 617         struct nfs41_call_sync_data data = {
 618                 .seq_server = server,
 619                 .seq_args = args,
 620                 .seq_res = res,
 621                 .cache_reply = cache_reply,
 622         };
 623         struct rpc_task_setup task_setup = {
 624                 .rpc_client = server->client,
 625                 .rpc_message = msg,
 626                 .callback_ops = &nfs41_call_sync_ops,
 627                 .callback_data = &data
 628         };
 629
 630         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 631         if (privileged)
 632                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 633         task = rpc_run_task(&task_setup);
 634         if (IS_ERR(task))
 635                 ret = PTR_ERR(task);
 636         else {
 637                 ret = task->tk_status;
 638                 rpc_put_task(task);
 639         }
 640         return ret;
 641 }
 642
 643 int _nfs4_call_sync_session(struct nfs_server *server,
 644                             struct rpc_message *msg,
 645                             struct nfs4_sequence_args *args,
 646                             struct nfs4_sequence_res *res,
 647                             int cache_reply)
 648 {
 649         return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
 650 }
 651
 652 #else
 653 static void nfs4_sequence_done(const struct nfs_server *server,
 654                                struct nfs4_sequence_res *res, int rpc_status)
 655 {
 656 }
 657 #endif /* CONFIG_NFS_V4_1 */
 658
 659 int _nfs4_call_sync(struct nfs_server *server,
 660                     struct rpc_message *msg,
 661                     struct nfs4_sequence_args *args,
 662                     struct nfs4_sequence_res *res,
 663                     int cache_reply)
 664 {
 665         args->sa_session = res->sr_session = NULL;
 666         return rpc_call_sync(server->client, msg, 0);
 667 }
 668
 669 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 670         (server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
 671                         &(res)->seq_res, (cache_reply))
 672
 673 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 674 {
 675         struct nfs_inode *nfsi = NFS_I(dir);
 676
 677         spin_lock(&dir->i_lock);
 678         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 679         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 680                 nfs_force_lookup_revalidate(dir);
 681         nfsi->change_attr = cinfo->after;
 682         spin_unlock(&dir->i_lock);
 683 }
 684
 685 struct nfs4_opendata {
 686         struct kref kref;
 687         struct nfs_openargs o_arg;
 688         struct nfs_openres o_res;
 689         struct nfs_open_confirmargs c_arg;
 690         struct nfs_open_confirmres c_res;
 691         struct nfs_fattr f_attr;
 692         struct nfs_fattr dir_attr;
 693         struct path path;
 694         struct dentry *dir;
 695         struct nfs4_state_owner *owner;
 696         struct nfs4_state *state;
 697         struct iattr attrs;
 698         unsigned long timestamp;
 699         unsigned int rpc_done : 1;
 700         int rpc_status;
 701         int cancelled;
 702 };
 703
 704
 705 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 706 {
 707         p->o_res.f_attr = &p->f_attr;
 708         p->o_res.dir_attr = &p->dir_attr;
 709         p->o_res.seqid = p->o_arg.seqid;
 710         p->c_res.seqid = p->c_arg.seqid;
 711         p->o_res.server = p->o_arg.server;
 712         nfs_fattr_init(&p->f_attr);
 713         nfs_fattr_init(&p->dir_attr);
 714         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
 715 }
 716
 717 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 718                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 719                 const struct iattr *attrs,
 720                 gfp_t gfp_mask)
 721 {
 722         struct dentry *parent = dget_parent(path->dentry);
 723         struct inode *dir = parent->d_inode;
 724         struct nfs_server *server = NFS_SERVER(dir);
 725         struct nfs4_opendata *p;
 726
 727         p = kzalloc(sizeof(*p), gfp_mask);
 728         if (p == NULL)
 729                 goto err;
 730         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 731         if (p->o_arg.seqid == NULL)
 732                 goto err_free;
 733         path_get(path);
 734         p->path = *path;
 735         p->dir = parent;
 736         p->owner = sp;
 737         atomic_inc(&sp->so_count);
 738         p->o_arg.fh = NFS_FH(dir);
 739         p->o_arg.open_flags = flags;
 740         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 741         p->o_arg.clientid = server->nfs_client->cl_clientid;
 742         p->o_arg.id = sp->so_owner_id.id;
 743         p->o_arg.name = &p->path.dentry->d_name;
 744         p->o_arg.server = server;
 745         p->o_arg.bitmask = server->attr_bitmask;
 746         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 747         if (flags & O_CREAT) {
 748                 u32 *s;
 749
 750                 p->o_arg.u.attrs = &p->attrs;
 751                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 752                 s = (u32 *) p->o_arg.u.verifier.data;
 753                 s[0] = jiffies;
 754                 s[1] = current->pid;
 755         }
 756         p->c_arg.fh = &p->o_res.fh;
 757         p->c_arg.stateid = &p->o_res.stateid;
 758         p->c_arg.seqid = p->o_arg.seqid;
 759         nfs4_init_opendata_res(p);
 760         kref_init(&p->kref);
 761         return p;
 762 err_free:
 763         kfree(p);
 764 err:
 765         dput(parent);
 766         return NULL;
 767 }
 768
 769 static void nfs4_opendata_free(struct kref *kref)
 770 {
 771         struct nfs4_opendata *p = container_of(kref,
 772                         struct nfs4_opendata, kref);
 773
 774         nfs_free_seqid(p->o_arg.seqid);
 775         if (p->state != NULL)
 776                 nfs4_put_open_state(p->state);
 777         nfs4_put_state_owner(p->owner);
 778         dput(p->dir);
 779         path_put(&p->path);
 780         kfree(p);
 781 }
 782
 783 static void nfs4_opendata_put(struct nfs4_opendata *p)
 784 {
 785         if (p != NULL)
 786                 kref_put(&p->kref, nfs4_opendata_free);
 787 }
 788
 789 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 790 {
 791         int ret;
 792
 793         ret = rpc_wait_for_completion_task(task);
 794         return ret;
 795 }
 796
 797 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 798 {
 799         int ret = 0;
 800
 801         if (open_mode & O_EXCL)
 802                 goto out;
 803         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 804                 case FMODE_READ:
 805                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 806                                 && state->n_rdonly != 0;
 807                         break;
 808                 case FMODE_WRITE:
 809                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 810                                 && state->n_wronly != 0;
 811                         break;
 812                 case FMODE_READ|FMODE_WRITE:
 813                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 814                                 && state->n_rdwr != 0;
 815         }
 816 out:
 817         return ret;
 818 }
 819
 820 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 821 {
 822         if ((delegation->type & fmode) != fmode)
 823                 return 0;
 824         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 825                 return 0;
 826         nfs_mark_delegation_referenced(delegation);
 827         return 1;
 828 }
 829
 830 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 831 {
 832         switch (fmode) {
 833                 case FMODE_WRITE:
 834                         state->n_wronly++;
 835                         break;
 836                 case FMODE_READ:
 837                         state->n_rdonly++;
 838                         break;
 839                 case FMODE_READ|FMODE_WRITE:
 840                         state->n_rdwr++;
 841         }
 842         nfs4_state_set_mode_locked(state, state->state | fmode);
 843 }
 844
 845 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 846 {
 847         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 848                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 849         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 850         switch (fmode) {
 851                 case FMODE_READ:
 852                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 853                         break;
 854                 case FMODE_WRITE:
 855                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 856                         break;
 857                 case FMODE_READ|FMODE_WRITE:
 858                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 859         }
 860 }
 861
 862 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 863 {
 864         write_seqlock(&state->seqlock);
 865         nfs_set_open_stateid_locked(state, stateid, fmode);
 866         write_sequnlock(&state->seqlock);
 867 }
 868
 869 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 870 {
 871         /*
 872          * Protect the call to nfs4_state_set_mode_locked and
 873          * serialise the stateid update
 874          */
 875         write_seqlock(&state->seqlock);
 876         if (deleg_stateid != NULL) {
 877                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 878                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 879         }
 880         if (open_stateid != NULL)
 881                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 882         write_sequnlock(&state->seqlock);
 883         spin_lock(&state->owner->so_lock);
 884         update_open_stateflags(state, fmode);
 885         spin_unlock(&state->owner->so_lock);
 886 }
 887
 888 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 889 {
 890         struct nfs_inode *nfsi = NFS_I(state->inode);
 891         struct nfs_delegation *deleg_cur;
 892         int ret = 0;
 893
 894         fmode &= (FMODE_READ|FMODE_WRITE);
 895
 896         rcu_read_lock();
 897         deleg_cur = rcu_dereference(nfsi->delegation);
 898         if (deleg_cur == NULL)
 899                 goto no_delegation;
 900
 901         spin_lock(&deleg_cur->lock);
 902         if (nfsi->delegation != deleg_cur ||
 903             (deleg_cur->type & fmode) != fmode)
 904                 goto no_delegation_unlock;
 905
 906         if (delegation == NULL)
 907                 delegation = &deleg_cur->stateid;
 908         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 909                 goto no_delegation_unlock;
 910
 911         nfs_mark_delegation_referenced(deleg_cur);
 912         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 913         ret = 1;
 914 no_delegation_unlock:
 915         spin_unlock(&deleg_cur->lock);
 916 no_delegation:
 917         rcu_read_unlock();
 918
 919         if (!ret && open_stateid != NULL) {
 920                 __update_open_stateid(state, open_stateid, NULL, fmode);
 921                 ret = 1;
 922         }
 923
 924         return ret;
 925 }
 926
 927
 928 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 929 {
 930         struct nfs_delegation *delegation;
 931
 932         rcu_read_lock();
 933         delegation = rcu_dereference(NFS_I(inode)->delegation);
 934         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 935                 rcu_read_unlock();
 936                 return;
 937         }
 938         rcu_read_unlock();
 939         nfs_inode_return_delegation(inode);
 940 }
 941
 942 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 943 {
 944         struct nfs4_state *state = opendata->state;
 945         struct nfs_inode *nfsi = NFS_I(state->inode);
 946         struct nfs_delegation *delegation;
 947         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 948         fmode_t fmode = opendata->o_arg.fmode;
 949         nfs4_stateid stateid;
 950         int ret = -EAGAIN;
 951
 952         for (;;) {
 953                 if (can_open_cached(state, fmode, open_mode)) {
 954                         spin_lock(&state->owner->so_lock);
 955                         if (can_open_cached(state, fmode, open_mode)) {
 956                                 update_open_stateflags(state, fmode);
 957                                 spin_unlock(&state->owner->so_lock);
 958                                 goto out_return_state;
 959                         }
 960                         spin_unlock(&state->owner->so_lock);
 961                 }
 962                 rcu_read_lock();
 963                 delegation = rcu_dereference(nfsi->delegation);
 964                 if (delegation == NULL ||
 965                     !can_open_delegated(delegation, fmode)) {
 966                         rcu_read_unlock();
 967                         break;
 968                 }
 969                 /* Save the delegation */
 970                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 971                 rcu_read_unlock();
 972                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 973                 if (ret != 0)
 974                         goto out;
 975                 ret = -EAGAIN;
 976
 977                 /* Try to update the stateid using the delegation */
 978                 if (update_open_stateid(state, NULL, &stateid, fmode))
 979                         goto out_return_state;
 980         }
 981 out:
 982         return ERR_PTR(ret);
 983 out_return_state:
 984         atomic_inc(&state->count);
 985         return state;
 986 }
 987
 988 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 989 {
 990         struct inode *inode;
 991         struct nfs4_state *state = NULL;
 992         struct nfs_delegation *delegation;
 993         int ret;
 994
 995         if (!data->rpc_done) {
 996                 state = nfs4_try_open_cached(data);
 997                 goto out;
 998         }
 999
1000         ret = -EAGAIN;
1001         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1002                 goto err;
1003         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1004         ret = PTR_ERR(inode);
1005         if (IS_ERR(inode))
1006                 goto err;
1007         ret = -ENOMEM;
1008         state = nfs4_get_open_state(inode, data->owner);
1009         if (state == NULL)
1010                 goto err_put_inode;
1011         if (data->o_res.delegation_type != 0) {
1012                 int delegation_flags = 0;
1013
1014                 rcu_read_lock();
1015                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1016                 if (delegation)
1017                         delegation_flags = delegation->flags;
1018                 rcu_read_unlock();
1019                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1020                         nfs_inode_set_delegation(state->inode,
1021                                         data->owner->so_cred,
1022                                         &data->o_res);
1023                 else
1024                         nfs_inode_reclaim_delegation(state->inode,
1025                                         data->owner->so_cred,
1026                                         &data->o_res);
1027         }
1028
1029         update_open_stateid(state, &data->o_res.stateid, NULL,
1030                         data->o_arg.fmode);
1031         iput(inode);
1032 out:
1033         return state;
1034 err_put_inode:
1035         iput(inode);
1036 err:
1037         return ERR_PTR(ret);
1038 }
1039
1040 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1041 {
1042         struct nfs_inode *nfsi = NFS_I(state->inode);
1043         struct nfs_open_context *ctx;
1044
1045         spin_lock(&state->inode->i_lock);
1046         list_for_each_entry(ctx, &nfsi->open_files, list) {
1047                 if (ctx->state != state)
1048                         continue;
1049                 get_nfs_open_context(ctx);
1050                 spin_unlock(&state->inode->i_lock);
1051                 return ctx;
1052         }
1053         spin_unlock(&state->inode->i_lock);
1054         return ERR_PTR(-ENOENT);
1055 }
1056
1057 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1058 {
1059         struct nfs4_opendata *opendata;
1060
1061         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1062         if (opendata == NULL)
1063                 return ERR_PTR(-ENOMEM);
1064         opendata->state = state;
1065         atomic_inc(&state->count);
1066         return opendata;
1067 }
1068
1069 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1070 {
1071         struct nfs4_state *newstate;
1072         int ret;
1073
1074         opendata->o_arg.open_flags = 0;
1075         opendata->o_arg.fmode = fmode;
1076         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1077         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1078         nfs4_init_opendata_res(opendata);
1079         ret = _nfs4_recover_proc_open(opendata);
1080         if (ret != 0)
1081                 return ret;
1082         newstate = nfs4_opendata_to_nfs4_state(opendata);
1083         if (IS_ERR(newstate))
1084                 return PTR_ERR(newstate);
1085         nfs4_close_state(&opendata->path, newstate, fmode);
1086         *res = newstate;
1087         return 0;
1088 }
1089
1090 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1091 {
1092         struct nfs4_state *newstate;
1093         int ret;
1094
1095         /* memory barrier prior to reading state->n_* */
1096         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1097         smp_rmb();
1098         if (state->n_rdwr != 0) {
1099                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1100                 if (ret != 0)
1101                         return ret;
1102                 if (newstate != state)
1103                         return -ESTALE;
1104         }
1105         if (state->n_wronly != 0) {
1106                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1107                 if (ret != 0)
1108                         return ret;
1109                 if (newstate != state)
1110                         return -ESTALE;
1111         }
1112         if (state->n_rdonly != 0) {
1113                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1114                 if (ret != 0)
1115                         return ret;
1116                 if (newstate != state)
1117                         return -ESTALE;
1118         }
1119         /*
1120          * We may have performed cached opens for all three recoveries.
1121          * Check if we need to update the current stateid.
1122          */
1123         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1124             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1125                 write_seqlock(&state->seqlock);
1126                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1127                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1128                 write_sequnlock(&state->seqlock);
1129         }
1130         return 0;
1131 }
1132
1133 /*
1134  * OPEN_RECLAIM:
1135  *      reclaim state on the server after a reboot.
1136  */
1137 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1138 {
1139         struct nfs_delegation *delegation;
1140         struct nfs4_opendata *opendata;
1141         fmode_t delegation_type = 0;
1142         int status;
1143
1144         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1145         if (IS_ERR(opendata))
1146                 return PTR_ERR(opendata);
1147         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1148         opendata->o_arg.fh = NFS_FH(state->inode);
1149         rcu_read_lock();
1150         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1151         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1152                 delegation_type = delegation->type;
1153         rcu_read_unlock();
1154         opendata->o_arg.u.delegation_type = delegation_type;
1155         status = nfs4_open_recover(opendata, state);
1156         nfs4_opendata_put(opendata);
1157         return status;
1158 }
1159
1160 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1161 {
1162         struct nfs_server *server = NFS_SERVER(state->inode);
1163         struct nfs4_exception exception = { };
1164         int err;
1165         do {
1166                 err = _nfs4_do_open_reclaim(ctx, state);
1167                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
1168                         break;
1169                 nfs4_handle_exception(server, err, &exception);
1170         } while (exception.retry);
1171         return err;
1172 }
1173
1174 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1175 {
1176         struct nfs_open_context *ctx;
1177         int ret;
1178
1179         ctx = nfs4_state_find_open_context(state);
1180         if (IS_ERR(ctx))
1181                 return PTR_ERR(ctx);
1182         ret = nfs4_do_open_reclaim(ctx, state);
1183         put_nfs_open_context(ctx);
1184         return ret;
1185 }
1186
1187 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1188 {
1189         struct nfs4_opendata *opendata;
1190         int ret;
1191
1192         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1193         if (IS_ERR(opendata))
1194                 return PTR_ERR(opendata);
1195         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1196         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1197                         sizeof(opendata->o_arg.u.delegation.data));
1198         ret = nfs4_open_recover(opendata, state);
1199         nfs4_opendata_put(opendata);
1200         return ret;
1201 }
1202
1203 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1204 {
1205         struct nfs4_exception exception = { };
1206         struct nfs_server *server = NFS_SERVER(state->inode);
1207         int err;
1208         do {
1209                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1210                 switch (err) {
1211                         case 0:
1212                         case -ENOENT:
1213                         case -ESTALE:
1214                                 goto out;
1215                         case -NFS4ERR_BADSESSION:
1216                         case -NFS4ERR_BADSLOT:
1217                         case -NFS4ERR_BAD_HIGH_SLOT:
1218                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1219                         case -NFS4ERR_DEADSESSION:
1220                                 nfs4_schedule_state_recovery(
1221                                         server->nfs_client);
1222                                 goto out;
1223                         case -NFS4ERR_STALE_CLIENTID:
1224                         case -NFS4ERR_STALE_STATEID:
1225                         case -NFS4ERR_EXPIRED:
1226                                 /* Don't recall a delegation if it was lost */
1227                                 nfs4_schedule_state_recovery(server->nfs_client);
1228                                 goto out;
1229                         case -ERESTARTSYS:
1230                                 /*
1231                                  * The show must go on: exit, but mark the
1232                                  * stateid as needing recovery.
1233                                  */
1234                         case -NFS4ERR_ADMIN_REVOKED:
1235                         case -NFS4ERR_BAD_STATEID:
1236                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1237                         case -ENOMEM:
1238                                 err = 0;
1239                                 goto out;
1240                 }
1241                 err = nfs4_handle_exception(server, err, &exception);
1242         } while (exception.retry);
1243 out:
1244         return err;
1245 }
1246
1247 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1248 {
1249         struct nfs4_opendata *data = calldata;
1250
1251         data->rpc_status = task->tk_status;
1252         if (RPC_ASSASSINATED(task))
1253                 return;
1254         if (data->rpc_status == 0) {
1255                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1256                                 sizeof(data->o_res.stateid.data));
1257                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1258                 renew_lease(data->o_res.server, data->timestamp);
1259                 data->rpc_done = 1;
1260         }
1261 }
1262
1263 static void nfs4_open_confirm_release(void *calldata)
1264 {
1265         struct nfs4_opendata *data = calldata;
1266         struct nfs4_state *state = NULL;
1267
1268         /* If this request hasn't been cancelled, do nothing */
1269         if (data->cancelled == 0)
1270                 goto out_free;
1271         /* In case of error, no cleanup! */
1272         if (!data->rpc_done)
1273                 goto out_free;
1274         state = nfs4_opendata_to_nfs4_state(data);
1275         if (!IS_ERR(state))
1276                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1277 out_free:
1278         nfs4_opendata_put(data);
1279 }
1280
1281 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1282         .rpc_call_done = nfs4_open_confirm_done,
1283         .rpc_release = nfs4_open_confirm_release,
1284 };
1285
1286 /*
1287  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1288  */
1289 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1290 {
1291         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1292         struct rpc_task *task;
1293         struct  rpc_message msg = {
1294                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1295                 .rpc_argp = &data->c_arg,
1296                 .rpc_resp = &data->c_res,
1297                 .rpc_cred = data->owner->so_cred,
1298         };
1299         struct rpc_task_setup task_setup_data = {
1300                 .rpc_client = server->client,
1301                 .rpc_message = &msg,
1302                 .callback_ops = &nfs4_open_confirm_ops,
1303                 .callback_data = data,
1304                 .workqueue = nfsiod_workqueue,
1305                 .flags = RPC_TASK_ASYNC,
1306         };
1307         int status;
1308
1309         kref_get(&data->kref);
1310         data->rpc_done = 0;
1311         data->rpc_status = 0;
1312         data->timestamp = jiffies;
1313         task = rpc_run_task(&task_setup_data);
1314         if (IS_ERR(task))
1315                 return PTR_ERR(task);
1316         status = nfs4_wait_for_completion_rpc_task(task);
1317         if (status != 0) {
1318                 data->cancelled = 1;
1319                 smp_wmb();
1320         } else
1321                 status = data->rpc_status;
1322         rpc_put_task(task);
1323         return status;
1324 }
1325
1326 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1327 {
1328         struct nfs4_opendata *data = calldata;
1329         struct nfs4_state_owner *sp = data->owner;
1330
1331         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1332                 return;
1333         /*
1334          * Check if we still need to send an OPEN call, or if we can use
1335          * a delegation instead.
1336          */
1337         if (data->state != NULL) {
1338                 struct nfs_delegation *delegation;
1339
1340                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1341                         goto out_no_action;
1342                 rcu_read_lock();
1343                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1344                 if (delegation != NULL &&
1345                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1346                         rcu_read_unlock();
1347                         goto out_no_action;
1348                 }
1349                 rcu_read_unlock();
1350         }
1351         /* Update sequence id. */
1352         data->o_arg.id = sp->so_owner_id.id;
1353         data->o_arg.clientid = sp->so_client->cl_clientid;
1354         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1355                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1356                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1357         }
1358         data->timestamp = jiffies;
1359         if (nfs4_setup_sequence(data->o_arg.server,
1360                                 &data->o_arg.seq_args,
1361                                 &data->o_res.seq_res, 1, task))
1362                 return;
1363         rpc_call_start(task);
1364         return;
1365 out_no_action:
1366         task->tk_action = NULL;
1367
1368 }
1369
1370 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1371 {
1372         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1373         nfs4_open_prepare(task, calldata);
1374 }
1375
1376 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1377 {
1378         struct nfs4_opendata *data = calldata;
1379
1380         data->rpc_status = task->tk_status;
1381
1382         nfs4_sequence_done(data->o_arg.server, &data->o_res.seq_res,
1383                         task->tk_status);
1384
1385         if (RPC_ASSASSINATED(task))
1386                 return;
1387         if (task->tk_status == 0) {
1388                 switch (data->o_res.f_attr->mode & S_IFMT) {
1389                         case S_IFREG:
1390                                 break;
1391                         case S_IFLNK:
1392                                 data->rpc_status = -ELOOP;
1393                                 break;
1394                         case S_IFDIR:
1395                                 data->rpc_status = -EISDIR;
1396                                 break;
1397                         default:
1398                                 data->rpc_status = -ENOTDIR;
1399                 }
1400                 renew_lease(data->o_res.server, data->timestamp);
1401                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1402                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1403         }
1404         data->rpc_done = 1;
1405 }
1406
1407 static void nfs4_open_release(void *calldata)
1408 {
1409         struct nfs4_opendata *data = calldata;
1410         struct nfs4_state *state = NULL;
1411
1412         /* If this request hasn't been cancelled, do nothing */
1413         if (data->cancelled == 0)
1414                 goto out_free;
1415         /* In case of error, no cleanup! */
1416         if (data->rpc_status != 0 || !data->rpc_done)
1417                 goto out_free;
1418         /* In case we need an open_confirm, no cleanup! */
1419         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1420                 goto out_free;
1421         state = nfs4_opendata_to_nfs4_state(data);
1422         if (!IS_ERR(state))
1423                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1424 out_free:
1425         nfs4_opendata_put(data);
1426 }
1427
1428 static const struct rpc_call_ops nfs4_open_ops = {
1429         .rpc_call_prepare = nfs4_open_prepare,
1430         .rpc_call_done = nfs4_open_done,
1431         .rpc_release = nfs4_open_release,
1432 };
1433
1434 static const struct rpc_call_ops nfs4_recover_open_ops = {
1435         .rpc_call_prepare = nfs4_recover_open_prepare,
1436         .rpc_call_done = nfs4_open_done,
1437         .rpc_release = nfs4_open_release,
1438 };
1439
1440 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1441 {
1442         struct inode *dir = data->dir->d_inode;
1443         struct nfs_server *server = NFS_SERVER(dir);
1444         struct nfs_openargs *o_arg = &data->o_arg;
1445         struct nfs_openres *o_res = &data->o_res;
1446         struct rpc_task *task;
1447         struct rpc_message msg = {
1448                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1449                 .rpc_argp = o_arg,
1450                 .rpc_resp = o_res,
1451                 .rpc_cred = data->owner->so_cred,
1452         };
1453         struct rpc_task_setup task_setup_data = {
1454                 .rpc_client = server->client,
1455                 .rpc_message = &msg,
1456                 .callback_ops = &nfs4_open_ops,
1457                 .callback_data = data,
1458                 .workqueue = nfsiod_workqueue,
1459                 .flags = RPC_TASK_ASYNC,
1460         };
1461         int status;
1462
1463         kref_get(&data->kref);
1464         data->rpc_done = 0;
1465         data->rpc_status = 0;
1466         data->cancelled = 0;
1467         if (isrecover)
1468                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1469         task = rpc_run_task(&task_setup_data);
1470         if (IS_ERR(task))
1471                 return PTR_ERR(task);
1472         status = nfs4_wait_for_completion_rpc_task(task);
1473         if (status != 0) {
1474                 data->cancelled = 1;
1475                 smp_wmb();
1476         } else
1477                 status = data->rpc_status;
1478         rpc_put_task(task);
1479
1480         return status;
1481 }
1482
1483 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1484 {
1485         struct inode *dir = data->dir->d_inode;
1486         struct nfs_openres *o_res = &data->o_res;
1487         int status;
1488
1489         status = nfs4_run_open_task(data, 1);
1490         if (status != 0 || !data->rpc_done)
1491                 return status;
1492
1493         nfs_refresh_inode(dir, o_res->dir_attr);
1494
1495         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1496                 status = _nfs4_proc_open_confirm(data);
1497                 if (status != 0)
1498                         return status;
1499         }
1500
1501         return status;
1502 }
1503
1504 /*
1505  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1506  */
1507 static int _nfs4_proc_open(struct nfs4_opendata *data)
1508 {
1509         struct inode *dir = data->dir->d_inode;
1510         struct nfs_server *server = NFS_SERVER(dir);
1511         struct nfs_openargs *o_arg = &data->o_arg;
1512         struct nfs_openres *o_res = &data->o_res;
1513         int status;
1514
1515         status = nfs4_run_open_task(data, 0);
1516         if (status != 0 || !data->rpc_done)
1517                 return status;
1518
1519         if (o_arg->open_flags & O_CREAT) {
1520                 update_changeattr(dir, &o_res->cinfo);
1521                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1522         } else
1523                 nfs_refresh_inode(dir, o_res->dir_attr);
1524         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1525                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1526         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1527                 status = _nfs4_proc_open_confirm(data);
1528                 if (status != 0)
1529                         return status;
1530         }
1531         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1532                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1533         return 0;
1534 }
1535
1536 static int nfs4_recover_expired_lease(struct nfs_server *server)
1537 {
1538         struct nfs_client *clp = server->nfs_client;
1539         unsigned int loop;
1540         int ret;
1541
1542         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1543                 ret = nfs4_wait_clnt_recover(clp);
1544                 if (ret != 0)
1545                         break;
1546                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1547                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1548                         break;
1549                 nfs4_schedule_state_recovery(clp);
1550                 ret = -EIO;
1551         }
1552         return ret;
1553 }
1554
1555 /*
1556  * OPEN_EXPIRED:
1557  *      reclaim state on the server after a network partition.
1558  *      Assumes caller holds the appropriate lock
1559  */
1560 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1561 {
1562         struct nfs4_opendata *opendata;
1563         int ret;
1564
1565         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1566         if (IS_ERR(opendata))
1567                 return PTR_ERR(opendata);
1568         ret = nfs4_open_recover(opendata, state);
1569         if (ret == -ESTALE)
1570                 d_drop(ctx->path.dentry);
1571         nfs4_opendata_put(opendata);
1572         return ret;
1573 }
1574
1575 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1576 {
1577         struct nfs_server *server = NFS_SERVER(state->inode);
1578         struct nfs4_exception exception = { };
1579         int err;
1580
1581         do {
1582                 err = _nfs4_open_expired(ctx, state);
1583                 switch (err) {
1584                 default:
1585                         goto out;
1586                 case -NFS4ERR_GRACE:
1587                 case -NFS4ERR_DELAY:
1588                 case -EKEYEXPIRED:
1589                         nfs4_handle_exception(server, err, &exception);
1590                         err = 0;
1591                 }
1592         } while (exception.retry);
1593 out:
1594         return err;
1595 }
1596
1597 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1598 {
1599         struct nfs_open_context *ctx;
1600         int ret;
1601
1602         ctx = nfs4_state_find_open_context(state);
1603         if (IS_ERR(ctx))
1604                 return PTR_ERR(ctx);
1605         ret = nfs4_do_open_expired(ctx, state);
1606         put_nfs_open_context(ctx);
1607         return ret;
1608 }
1609
1610 /*
1611  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1612  * fields corresponding to attributes that were used to store the verifier.
1613  * Make sure we clobber those fields in the later setattr call
1614  */
1615 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1616 {
1617         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1618             !(sattr->ia_valid & ATTR_ATIME_SET))
1619                 sattr->ia_valid |= ATTR_ATIME;
1620
1621         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1622             !(sattr->ia_valid & ATTR_MTIME_SET))
1623                 sattr->ia_valid |= ATTR_MTIME;
1624 }
1625
1626 /*
1627  * Returns a referenced nfs4_state
1628  */
1629 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)
1630 {
1631         struct nfs4_state_owner  *sp;
1632         struct nfs4_state     *state = NULL;
1633         struct nfs_server       *server = NFS_SERVER(dir);
1634         struct nfs4_opendata *opendata;
1635         int status;
1636
1637         /* Protect against reboot recovery conflicts */
1638         status = -ENOMEM;
1639         if (!(sp = nfs4_get_state_owner(server, cred))) {
1640                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1641                 goto out_err;
1642         }
1643         status = nfs4_recover_expired_lease(server);
1644         if (status != 0)
1645                 goto err_put_state_owner;
1646         if (path->dentry->d_inode != NULL)
1647                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1648         status = -ENOMEM;
1649         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1650         if (opendata == NULL)
1651                 goto err_put_state_owner;
1652
1653         if (path->dentry->d_inode != NULL)
1654                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1655
1656         status = _nfs4_proc_open(opendata);
1657         if (status != 0)
1658                 goto err_opendata_put;
1659
1660         state = nfs4_opendata_to_nfs4_state(opendata);
1661         status = PTR_ERR(state);
1662         if (IS_ERR(state))
1663                 goto err_opendata_put;
1664         if (server->caps & NFS_CAP_POSIX_LOCK)
1665                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1666
1667         if (opendata->o_arg.open_flags & O_EXCL) {
1668                 nfs4_exclusive_attrset(opendata, sattr);
1669
1670                 nfs_fattr_init(opendata->o_res.f_attr);
1671                 status = nfs4_do_setattr(state->inode, cred,
1672                                 opendata->o_res.f_attr, sattr,
1673                                 state);
1674                 if (status == 0)
1675                         nfs_setattr_update_inode(state->inode, sattr);
1676                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1677         }
1678         nfs4_opendata_put(opendata);
1679         nfs4_put_state_owner(sp);
1680         *res = state;
1681         return 0;
1682 err_opendata_put:
1683         nfs4_opendata_put(opendata);
1684 err_put_state_owner:
1685         nfs4_put_state_owner(sp);
1686 out_err:
1687         *res = NULL;
1688         return status;
1689 }
1690
1691
1692 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)
1693 {
1694         struct nfs4_exception exception = { };
1695         struct nfs4_state *res;
1696         int status;
1697
1698         do {
1699                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1700                 if (status == 0)
1701                         break;
1702                 /* NOTE: BAD_SEQID means the server and client disagree about the
1703                  * book-keeping w.r.t. state-changing operations
1704                  * (OPEN/CLOSE/LOCK/LOCKU...)
1705                  * It is actually a sign of a bug on the client or on the server.
1706                  *
1707                  * If we receive a BAD_SEQID error in the particular case of
1708                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1709                  * have unhashed the old state_owner for us, and that we can
1710                  * therefore safely retry using a new one. We should still warn
1711                  * the user though...
1712                  */
1713                 if (status == -NFS4ERR_BAD_SEQID) {
1714                         printk(KERN_WARNING "NFS: v4 server %s "
1715                                         " returned a bad sequence-id error!\n",
1716                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1717                         exception.retry = 1;
1718                         continue;
1719                 }
1720                 /*
1721                  * BAD_STATEID on OPEN means that the server cancelled our
1722                  * state before it received the OPEN_CONFIRM.
1723                  * Recover by retrying the request as per the discussion
1724                  * on Page 181 of RFC3530.
1725                  */
1726                 if (status == -NFS4ERR_BAD_STATEID) {
1727                         exception.retry = 1;
1728                         continue;
1729                 }
1730                 if (status == -EAGAIN) {
1731                         /* We must have found a delegation */
1732                         exception.retry = 1;
1733                         continue;
1734                 }
1735                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1736                                         status, &exception));
1737         } while (exception.retry);
1738         return res;
1739 }
1740
1741 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1742                             struct nfs_fattr *fattr, struct iattr *sattr,
1743                             struct nfs4_state *state)
1744 {
1745         struct nfs_server *server = NFS_SERVER(inode);
1746         struct nfs_setattrargs  arg = {
1747                 .fh             = NFS_FH(inode),
1748                 .iap            = sattr,
1749                 .server         = server,
1750                 .bitmask = server->attr_bitmask,
1751         };
1752         struct nfs_setattrres  res = {
1753                 .fattr          = fattr,
1754                 .server         = server,
1755         };
1756         struct rpc_message msg = {
1757                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1758                 .rpc_argp       = &arg,
1759                 .rpc_resp       = &res,
1760                 .rpc_cred       = cred,
1761         };
1762         unsigned long timestamp = jiffies;
1763         int status;
1764
1765         nfs_fattr_init(fattr);
1766
1767         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1768                 /* Use that stateid */
1769         } else if (state != NULL) {
1770                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1771         } else
1772                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1773
1774         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1775         if (status == 0 && state != NULL)
1776                 renew_lease(server, timestamp);
1777         return status;
1778 }
1779
1780 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1781                            struct nfs_fattr *fattr, struct iattr *sattr,
1782                            struct nfs4_state *state)
1783 {
1784         struct nfs_server *server = NFS_SERVER(inode);
1785         struct nfs4_exception exception = { };
1786         int err;
1787         do {
1788                 err = nfs4_handle_exception(server,
1789                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1790                                 &exception);
1791         } while (exception.retry);
1792         return err;
1793 }
1794
1795 struct nfs4_closedata {
1796         struct path path;
1797         struct inode *inode;
1798         struct nfs4_state *state;
1799         struct nfs_closeargs arg;
1800         struct nfs_closeres res;
1801         struct nfs_fattr fattr;
1802         unsigned long timestamp;
1803 };
1804
1805 static void nfs4_free_closedata(void *data)
1806 {
1807         struct nfs4_closedata *calldata = data;
1808         struct nfs4_state_owner *sp = calldata->state->owner;
1809
1810         nfs4_put_open_state(calldata->state);
1811         nfs_free_seqid(calldata->arg.seqid);
1812         nfs4_put_state_owner(sp);
1813         path_put(&calldata->path);
1814         kfree(calldata);
1815 }
1816
1817 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1818                 fmode_t fmode)
1819 {
1820         spin_lock(&state->owner->so_lock);
1821         if (!(fmode & FMODE_READ))
1822                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1823         if (!(fmode & FMODE_WRITE))
1824                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1825         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1826         spin_unlock(&state->owner->so_lock);
1827 }
1828
1829 static void nfs4_close_done(struct rpc_task *task, void *data)
1830 {
1831         struct nfs4_closedata *calldata = data;
1832         struct nfs4_state *state = calldata->state;
1833         struct nfs_server *server = NFS_SERVER(calldata->inode);
1834
1835         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1836         if (RPC_ASSASSINATED(task))
1837                 return;
1838         /* hmm. we are done with the inode, and in the process of freeing
1839          * the state_owner. we keep this around to process errors
1840          */
1841         switch (task->tk_status) {
1842                 case 0:
1843                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1844                         renew_lease(server, calldata->timestamp);
1845                         nfs4_close_clear_stateid_flags(state,
1846                                         calldata->arg.fmode);
1847                         break;
1848                 case -NFS4ERR_STALE_STATEID:
1849                 case -NFS4ERR_OLD_STATEID:
1850                 case -NFS4ERR_BAD_STATEID:
1851                 case -NFS4ERR_EXPIRED:
1852                         if (calldata->arg.fmode == 0)
1853                                 break;
1854                 default:
1855                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1856                                 rpc_restart_call_prepare(task);
1857         }
1858         nfs_release_seqid(calldata->arg.seqid);
1859         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1860 }
1861
1862 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1863 {
1864         struct nfs4_closedata *calldata = data;
1865         struct nfs4_state *state = calldata->state;
1866         int call_close = 0;
1867
1868         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1869                 return;
1870
1871         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1872         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1873         spin_lock(&state->owner->so_lock);
1874         /* Calculate the change in open mode */
1875         if (state->n_rdwr == 0) {
1876                 if (state->n_rdonly == 0) {
1877                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1878                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1879                         calldata->arg.fmode &= ~FMODE_READ;
1880                 }
1881                 if (state->n_wronly == 0) {
1882                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1883                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1884                         calldata->arg.fmode &= ~FMODE_WRITE;
1885                 }
1886         }
1887         spin_unlock(&state->owner->so_lock);
1888
1889         if (!call_close) {
1890                 /* Note: exit _without_ calling nfs4_close_done */
1891                 task->tk_action = NULL;
1892                 return;
1893         }
1894
1895         if (calldata->arg.fmode == 0)
1896                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1897
1898         nfs_fattr_init(calldata->res.fattr);
1899         calldata->timestamp = jiffies;
1900         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1901                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1902                                 1, task))
1903                 return;
1904         rpc_call_start(task);
1905 }
1906
1907 static const struct rpc_call_ops nfs4_close_ops = {
1908         .rpc_call_prepare = nfs4_close_prepare,
1909         .rpc_call_done = nfs4_close_done,
1910         .rpc_release = nfs4_free_closedata,
1911 };
1912
1913 /*
1914  * It is possible for data to be read/written from a mem-mapped file
1915  * after the sys_close call (which hits the vfs layer as a flush).
1916  * This means that we can't safely call nfsv4 close on a file until
1917  * the inode is cleared. This in turn means that we are not good
1918  * NFSv4 citizens - we do not indicate to the server to update the file's
1919  * share state even when we are done with one of the three share
1920  * stateid's in the inode.
1921  *
1922  * NOTE: Caller must be holding the sp->so_owner semaphore!
1923  */
1924 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait)
1925 {
1926         struct nfs_server *server = NFS_SERVER(state->inode);
1927         struct nfs4_closedata *calldata;
1928         struct nfs4_state_owner *sp = state->owner;
1929         struct rpc_task *task;
1930         struct rpc_message msg = {
1931                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1932                 .rpc_cred = state->owner->so_cred,
1933         };
1934         struct rpc_task_setup task_setup_data = {
1935                 .rpc_client = server->client,
1936                 .rpc_message = &msg,
1937                 .callback_ops = &nfs4_close_ops,
1938                 .workqueue = nfsiod_workqueue,
1939                 .flags = RPC_TASK_ASYNC,
1940         };
1941         int status = -ENOMEM;
1942
1943         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1944         if (calldata == NULL)
1945                 goto out;
1946         calldata->inode = state->inode;
1947         calldata->state = state;
1948         calldata->arg.fh = NFS_FH(state->inode);
1949         calldata->arg.stateid = &state->open_stateid;
1950         /* Serialization for the sequence id */
1951         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
1952         if (calldata->arg.seqid == NULL)
1953                 goto out_free_calldata;
1954         calldata->arg.fmode = 0;
1955         calldata->arg.bitmask = server->cache_consistency_bitmask;
1956         calldata->res.fattr = &calldata->fattr;
1957         calldata->res.seqid = calldata->arg.seqid;
1958         calldata->res.server = server;
1959         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1960         path_get(path);
1961         calldata->path = *path;
1962
1963         msg.rpc_argp = &calldata->arg,
1964         msg.rpc_resp = &calldata->res,
1965         task_setup_data.callback_data = calldata;
1966         task = rpc_run_task(&task_setup_data);
1967         if (IS_ERR(task))
1968                 return PTR_ERR(task);
1969         status = 0;
1970         if (wait)
1971                 status = rpc_wait_for_completion_task(task);
1972         rpc_put_task(task);
1973         return status;
1974 out_free_calldata:
1975         kfree(calldata);
1976 out:
1977         nfs4_put_open_state(state);
1978         nfs4_put_state_owner(sp);
1979         return status;
1980 }
1981
1982 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1983 {
1984         struct file *filp;
1985         int ret;
1986
1987         /* If the open_intent is for execute, we have an extra check to make */
1988         if (fmode & FMODE_EXEC) {
1989                 ret = nfs_may_open(state->inode,
1990                                 state->owner->so_cred,
1991                                 nd->intent.open.flags);
1992                 if (ret < 0)
1993                         goto out_close;
1994         }
1995         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1996         if (!IS_ERR(filp)) {
1997                 struct nfs_open_context *ctx;
1998                 ctx = nfs_file_open_context(filp);
1999                 ctx->state = state;
2000                 return 0;
2001         }
2002         ret = PTR_ERR(filp);
2003 out_close:
2004         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
2005         return ret;
2006 }
2007
2008 struct dentry *
2009 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
2010 {
2011         struct path path = {
2012                 .mnt = nd->path.mnt,
2013                 .dentry = dentry,
2014         };
2015         struct dentry *parent;
2016         struct iattr attr;
2017         struct rpc_cred *cred;
2018         struct nfs4_state *state;
2019         struct dentry *res;
2020         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
2021
2022         if (nd->flags & LOOKUP_CREATE) {
2023                 attr.ia_mode = nd->intent.open.create_mode;
2024                 attr.ia_valid = ATTR_MODE;
2025                 if (!IS_POSIXACL(dir))
2026                         attr.ia_mode &= ~current_umask();
2027         } else {
2028                 attr.ia_valid = 0;
2029                 BUG_ON(nd->intent.open.flags & O_CREAT);
2030         }
2031
2032         cred = rpc_lookup_cred();
2033         if (IS_ERR(cred))
2034                 return (struct dentry *)cred;
2035         parent = dentry->d_parent;
2036         /* Protect against concurrent sillydeletes */
2037         nfs_block_sillyrename(parent);
2038         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
2039         put_rpccred(cred);
2040         if (IS_ERR(state)) {
2041                 if (PTR_ERR(state) == -ENOENT) {
2042                         d_add(dentry, NULL);
2043                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2044                 }
2045                 nfs_unblock_sillyrename(parent);
2046                 return (struct dentry *)state;
2047         }
2048         res = d_add_unique(dentry, igrab(state->inode));
2049         if (res != NULL)
2050                 path.dentry = res;
2051         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
2052         nfs_unblock_sillyrename(parent);
2053         nfs4_intent_set_file(nd, &path, state, fmode);
2054         return res;
2055 }
2056
2057 int
2058 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
2059 {
2060         struct path path = {
2061                 .mnt = nd->path.mnt,
2062                 .dentry = dentry,
2063         };
2064         struct rpc_cred *cred;
2065         struct nfs4_state *state;
2066         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
2067
2068         cred = rpc_lookup_cred();
2069         if (IS_ERR(cred))
2070                 return PTR_ERR(cred);
2071         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
2072         put_rpccred(cred);
2073         if (IS_ERR(state)) {
2074                 switch (PTR_ERR(state)) {
2075                         case -EPERM:
2076                         case -EACCES:
2077                         case -EDQUOT:
2078                         case -ENOSPC:
2079                         case -EROFS:
2080                                 return PTR_ERR(state);
2081                         default:
2082                                 goto out_drop;
2083                 }
2084         }
2085         if (state->inode == dentry->d_inode) {
2086                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2087                 nfs4_intent_set_file(nd, &path, state, fmode);
2088                 return 1;
2089         }
2090         nfs4_close_sync(&path, state, fmode);
2091 out_drop:
2092         d_drop(dentry);
2093         return 0;
2094 }
2095
2096 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2097 {
2098         if (ctx->state == NULL)
2099                 return;
2100         if (is_sync)
2101                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2102         else
2103                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2104 }
2105
2106 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2107 {
2108         struct nfs4_server_caps_arg args = {
2109                 .fhandle = fhandle,
2110         };
2111         struct nfs4_server_caps_res res = {};
2112         struct rpc_message msg = {
2113                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2114                 .rpc_argp = &args,
2115                 .rpc_resp = &res,
2116         };
2117         int status;
2118
2119         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2120         if (status == 0) {
2121                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2122                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2123                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2124                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2125                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2126                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2127                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2128                         server->caps |= NFS_CAP_ACLS;
2129                 if (res.has_links != 0)
2130                         server->caps |= NFS_CAP_HARDLINKS;
2131                 if (res.has_symlinks != 0)
2132                         server->caps |= NFS_CAP_SYMLINKS;
2133                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2134                         server->caps |= NFS_CAP_FILEID;
2135                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2136                         server->caps |= NFS_CAP_MODE;
2137                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2138                         server->caps |= NFS_CAP_NLINK;
2139                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2140                         server->caps |= NFS_CAP_OWNER;
2141                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2142                         server->caps |= NFS_CAP_OWNER_GROUP;
2143                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2144                         server->caps |= NFS_CAP_ATIME;
2145                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2146                         server->caps |= NFS_CAP_CTIME;
2147                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2148                         server->caps |= NFS_CAP_MTIME;
2149
2150                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2151                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2152                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2153                 server->acl_bitmask = res.acl_bitmask;
2154         }
2155
2156         return status;
2157 }
2158
2159 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2160 {
2161         struct nfs4_exception exception = { };
2162         int err;
2163         do {
2164                 err = nfs4_handle_exception(server,
2165                                 _nfs4_server_capabilities(server, fhandle),
2166                                 &exception);
2167         } while (exception.retry);
2168         return err;
2169 }
2170
2171 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2172                 struct nfs_fsinfo *info)
2173 {
2174         struct nfs4_lookup_root_arg args = {
2175                 .bitmask = nfs4_fattr_bitmap,
2176         };
2177         struct nfs4_lookup_res res = {
2178                 .server = server,
2179                 .fattr = info->fattr,
2180                 .fh = fhandle,
2181         };
2182         struct rpc_message msg = {
2183                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2184                 .rpc_argp = &args,
2185                 .rpc_resp = &res,
2186         };
2187
2188         nfs_fattr_init(info->fattr);
2189         return nfs4_call_sync(server, &msg, &args, &res, 0);
2190 }
2191
2192 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2193                 struct nfs_fsinfo *info)
2194 {
2195         struct nfs4_exception exception = { };
2196         int err;
2197         do {
2198                 err = nfs4_handle_exception(server,
2199                                 _nfs4_lookup_root(server, fhandle, info),
2200                                 &exception);
2201         } while (exception.retry);
2202         return err;
2203 }
2204
2205 /*
2206  * get the file handle for the "/" directory on the server
2207  */
2208 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2209                               struct nfs_fsinfo *info)
2210 {
2211         int status;
2212
2213         status = nfs4_lookup_root(server, fhandle, info);
2214         if (status == 0)
2215                 status = nfs4_server_capabilities(server, fhandle);
2216         if (status == 0)
2217                 status = nfs4_do_fsinfo(server, fhandle, info);
2218         return nfs4_map_errors(status);
2219 }
2220
2221 /*
2222  * Get locations and (maybe) other attributes of a referral.
2223  * Note that we'll actually follow the referral later when
2224  * we detect fsid mismatch in inode revalidation
2225  */
2226 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2227 {
2228         int status = -ENOMEM;
2229         struct page *page = NULL;
2230         struct nfs4_fs_locations *locations = NULL;
2231
2232         page = alloc_page(GFP_KERNEL);
2233         if (page == NULL)
2234                 goto out;
2235         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2236         if (locations == NULL)
2237                 goto out;
2238
2239         status = nfs4_proc_fs_locations(dir, name, locations, page);
2240         if (status != 0)
2241                 goto out;
2242         /* Make sure server returned a different fsid for the referral */
2243         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2244                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2245                 status = -EIO;
2246                 goto out;
2247         }
2248
2249         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2250         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2251         if (!fattr->mode)
2252                 fattr->mode = S_IFDIR;
2253         memset(fhandle, 0, sizeof(struct nfs_fh));
2254 out:
2255         if (page)
2256                 __free_page(page);
2257         if (locations)
2258                 kfree(locations);
2259         return status;
2260 }
2261
2262 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2263 {
2264         struct nfs4_getattr_arg args = {
2265                 .fh = fhandle,
2266                 .bitmask = server->attr_bitmask,
2267         };
2268         struct nfs4_getattr_res res = {
2269                 .fattr = fattr,
2270                 .server = server,
2271         };
2272         struct rpc_message msg = {
2273                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2274                 .rpc_argp = &args,
2275                 .rpc_resp = &res,
2276         };
2277
2278         nfs_fattr_init(fattr);
2279         return nfs4_call_sync(server, &msg, &args, &res, 0);
2280 }
2281
2282 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2283 {
2284         struct nfs4_exception exception = { };
2285         int err;
2286         do {
2287                 err = nfs4_handle_exception(server,
2288                                 _nfs4_proc_getattr(server, fhandle, fattr),
2289                                 &exception);
2290         } while (exception.retry);
2291         return err;
2292 }
2293
2294 /*
2295  * The file is not closed if it is opened due to the a request to change
2296  * the size of the file. The open call will not be needed once the
2297  * VFS layer lookup-intents are implemented.
2298  *
2299  * Close is called when the inode is destroyed.
2300  * If we haven't opened the file for O_WRONLY, we
2301  * need to in the size_change case to obtain a stateid.
2302  *
2303  * Got race?
2304  * Because OPEN is always done by name in nfsv4, it is
2305  * possible that we opened a different file by the same
2306  * name.  We can recognize this race condition, but we
2307  * can't do anything about it besides returning an error.
2308  *
2309  * This will be fixed with VFS changes (lookup-intent).
2310  */
2311 static int
2312 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2313                   struct iattr *sattr)
2314 {
2315         struct inode *inode = dentry->d_inode;
2316         struct rpc_cred *cred = NULL;
2317         struct nfs4_state *state = NULL;
2318         int status;
2319
2320         nfs_fattr_init(fattr);
2321
2322         /* Search for an existing open(O_WRITE) file */
2323         if (sattr->ia_valid & ATTR_FILE) {
2324                 struct nfs_open_context *ctx;
2325
2326                 ctx = nfs_file_open_context(sattr->ia_file);
2327                 if (ctx) {
2328                         cred = ctx->cred;
2329                         state = ctx->state;
2330                 }
2331         }
2332
2333         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2334         if (status == 0)
2335                 nfs_setattr_update_inode(inode, sattr);
2336         return status;
2337 }
2338
2339 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2340                 const struct qstr *name, struct nfs_fh *fhandle,
2341                 struct nfs_fattr *fattr)
2342 {
2343         int                    status;
2344         struct nfs4_lookup_arg args = {
2345                 .bitmask = server->attr_bitmask,
2346                 .dir_fh = dirfh,
2347                 .name = name,
2348         };
2349         struct nfs4_lookup_res res = {
2350                 .server = server,
2351                 .fattr = fattr,
2352                 .fh = fhandle,
2353         };
2354         struct rpc_message msg = {
2355                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2356                 .rpc_argp = &args,
2357                 .rpc_resp = &res,
2358         };
2359
2360         nfs_fattr_init(fattr);
2361
2362         dprintk("NFS call  lookupfh %s\n", name->name);
2363         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2364         dprintk("NFS reply lookupfh: %d\n", status);
2365         return status;
2366 }
2367
2368 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2369                               struct qstr *name, struct nfs_fh *fhandle,
2370                               struct nfs_fattr *fattr)
2371 {
2372         struct nfs4_exception exception = { };
2373         int err;
2374         do {
2375                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2376                 /* FIXME: !!!! */
2377                 if (err == -NFS4ERR_MOVED) {
2378                         err = -EREMOTE;
2379                         break;
2380                 }
2381                 err = nfs4_handle_exception(server, err, &exception);
2382         } while (exception.retry);
2383         return err;
2384 }
2385
2386 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2387                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2388 {
2389         int status;
2390
2391         dprintk("NFS call  lookup %s\n", name->name);
2392         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2393         if (status == -NFS4ERR_MOVED)
2394                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2395         dprintk("NFS reply lookup: %d\n", status);
2396         return status;
2397 }
2398
2399 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2400 {
2401         struct nfs4_exception exception = { };
2402         int err;
2403         do {
2404                 err = nfs4_handle_exception(NFS_SERVER(dir),
2405                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2406                                 &exception);
2407         } while (exception.retry);
2408         return err;
2409 }
2410
2411 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2412 {
2413         struct nfs_server *server = NFS_SERVER(inode);
2414         struct nfs4_accessargs args = {
2415                 .fh = NFS_FH(inode),
2416                 .bitmask = server->attr_bitmask,
2417         };
2418         struct nfs4_accessres res = {
2419                 .server = server,
2420         };
2421         struct rpc_message msg = {
2422                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2423                 .rpc_argp = &args,
2424                 .rpc_resp = &res,
2425                 .rpc_cred = entry->cred,
2426         };
2427         int mode = entry->mask;
2428         int status;
2429
2430         /*
2431          * Determine which access bits we want to ask for...
2432          */
2433         if (mode & MAY_READ)
2434                 args.access |= NFS4_ACCESS_READ;
2435         if (S_ISDIR(inode->i_mode)) {
2436                 if (mode & MAY_WRITE)
2437                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2438                 if (mode & MAY_EXEC)
2439                         args.access |= NFS4_ACCESS_LOOKUP;
2440         } else {
2441                 if (mode & MAY_WRITE)
2442                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2443                 if (mode & MAY_EXEC)
2444                         args.access |= NFS4_ACCESS_EXECUTE;
2445         }
2446
2447         res.fattr = nfs_alloc_fattr();
2448         if (res.fattr == NULL)
2449                 return -ENOMEM;
2450
2451         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2452         if (!status) {
2453                 entry->mask = 0;
2454                 if (res.access & NFS4_ACCESS_READ)
2455                         entry->mask |= MAY_READ;
2456                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2457                         entry->mask |= MAY_WRITE;
2458                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2459                         entry->mask |= MAY_EXEC;
2460                 nfs_refresh_inode(inode, res.fattr);
2461         }
2462         nfs_free_fattr(res.fattr);
2463         return status;
2464 }
2465
2466 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2467 {
2468         struct nfs4_exception exception = { };
2469         int err;
2470         do {
2471                 err = nfs4_handle_exception(NFS_SERVER(inode),
2472                                 _nfs4_proc_access(inode, entry),
2473                                 &exception);
2474         } while (exception.retry);
2475         return err;
2476 }
2477
2478 /*
2479  * TODO: For the time being, we don't try to get any attributes
2480  * along with any of the zero-copy operations READ, READDIR,
2481  * READLINK, WRITE.
2482  *
2483  * In the case of the first three, we want to put the GETATTR
2484  * after the read-type operation -- this is because it is hard
2485  * to predict the length of a GETATTR response in v4, and thus
2486  * align the READ data correctly.  This means that the GETATTR
2487  * may end up partially falling into the page cache, and we should
2488  * shift it into the 'tail' of the xdr_buf before processing.
2489  * To do this efficiently, we need to know the total length
2490  * of data received, which doesn't seem to be available outside
2491  * of the RPC layer.
2492  *
2493  * In the case of WRITE, we also want to put the GETATTR after
2494  * the operation -- in this case because we want to make sure
2495  * we get the post-operation mtime and size.  This means that
2496  * we can't use xdr_encode_pages() as written: we need a variant
2497  * of it which would leave room in the 'tail' iovec.
2498  *
2499  * Both of these changes to the XDR layer would in fact be quite
2500  * minor, but I decided to leave them for a subsequent patch.
2501  */
2502 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2503                 unsigned int pgbase, unsigned int pglen)
2504 {
2505         struct nfs4_readlink args = {
2506                 .fh       = NFS_FH(inode),
2507                 .pgbase   = pgbase,
2508                 .pglen    = pglen,
2509                 .pages    = &page,
2510         };
2511         struct nfs4_readlink_res res;
2512         struct rpc_message msg = {
2513                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2514                 .rpc_argp = &args,
2515                 .rpc_resp = &res,
2516         };
2517
2518         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2519 }
2520
2521 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2522                 unsigned int pgbase, unsigned int pglen)
2523 {
2524         struct nfs4_exception exception = { };
2525         int err;
2526         do {
2527                 err = nfs4_handle_exception(NFS_SERVER(inode),
2528                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2529                                 &exception);
2530         } while (exception.retry);
2531         return err;
2532 }
2533
2534 /*
2535  * Got race?
2536  * We will need to arrange for the VFS layer to provide an atomic open.
2537  * Until then, this create/open method is prone to inefficiency and race
2538  * conditions due to the lookup, create, and open VFS calls from sys_open()
2539  * placed on the wire.
2540  *
2541  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2542  * The file will be opened again in the subsequent VFS open call
2543  * (nfs4_proc_file_open).
2544  *
2545  * The open for read will just hang around to be used by any process that
2546  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2547  */
2548
2549 static int
2550 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2551                  int flags, struct nameidata *nd)
2552 {
2553         struct path path = {
2554                 .mnt = nd->path.mnt,
2555                 .dentry = dentry,
2556         };
2557         struct nfs4_state *state;
2558         struct rpc_cred *cred;
2559         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2560         int status = 0;
2561
2562         cred = rpc_lookup_cred();
2563         if (IS_ERR(cred)) {
2564                 status = PTR_ERR(cred);
2565                 goto out;
2566         }
2567         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2568         d_drop(dentry);
2569         if (IS_ERR(state)) {
2570                 status = PTR_ERR(state);
2571                 goto out_putcred;
2572         }
2573         d_add(dentry, igrab(state->inode));
2574         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2575         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2576                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2577         else
2578                 nfs4_close_sync(&path, state, fmode);
2579 out_putcred:
2580         put_rpccred(cred);
2581 out:
2582         return status;
2583 }
2584
2585 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2586 {
2587         struct nfs_server *server = NFS_SERVER(dir);
2588         struct nfs_removeargs args = {
2589                 .fh = NFS_FH(dir),
2590                 .name.len = name->len,
2591                 .name.name = name->name,
2592                 .bitmask = server->attr_bitmask,
2593         };
2594         struct nfs_removeres res = {
2595                 .server = server,
2596         };
2597         struct rpc_message msg = {
2598                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2599                 .rpc_argp = &args,
2600                 .rpc_resp = &res,
2601         };
2602         int status = -ENOMEM;
2603
2604         res.dir_attr = nfs_alloc_fattr();
2605         if (res.dir_attr == NULL)
2606                 goto out;
2607
2608         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2609         if (status == 0) {
2610                 update_changeattr(dir, &res.cinfo);
2611                 nfs_post_op_update_inode(dir, res.dir_attr);
2612         }
2613         nfs_free_fattr(res.dir_attr);
2614 out:
2615         return status;
2616 }
2617
2618 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2619 {
2620         struct nfs4_exception exception = { };
2621         int err;
2622         do {
2623                 err = nfs4_handle_exception(NFS_SERVER(dir),
2624                                 _nfs4_proc_remove(dir, name),
2625                                 &exception);
2626         } while (exception.retry);
2627         return err;
2628 }
2629
2630 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2631 {
2632         struct nfs_server *server = NFS_SERVER(dir);
2633         struct nfs_removeargs *args = msg->rpc_argp;
2634         struct nfs_removeres *res = msg->rpc_resp;
2635
2636         args->bitmask = server->cache_consistency_bitmask;
2637         res->server = server;
2638         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2639 }
2640
2641 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2642 {
2643         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2644
2645         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2646         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2647                 return 0;
2648         update_changeattr(dir, &res->cinfo);
2649         nfs_post_op_update_inode(dir, res->dir_attr);
2650         return 1;
2651 }
2652
2653 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2654                 struct inode *new_dir, struct qstr *new_name)
2655 {
2656         struct nfs_server *server = NFS_SERVER(old_dir);
2657         struct nfs4_rename_arg arg = {
2658                 .old_dir = NFS_FH(old_dir),
2659                 .new_dir = NFS_FH(new_dir),
2660                 .old_name = old_name,
2661                 .new_name = new_name,
2662                 .bitmask = server->attr_bitmask,
2663         };
2664         struct nfs4_rename_res res = {
2665                 .server = server,
2666         };
2667         struct rpc_message msg = {
2668                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2669                 .rpc_argp = &arg,
2670                 .rpc_resp = &res,
2671         };
2672         int status = -ENOMEM;
2673
2674         res.old_fattr = nfs_alloc_fattr();
2675         res.new_fattr = nfs_alloc_fattr();
2676         if (res.old_fattr == NULL || res.new_fattr == NULL)
2677                 goto out;
2678
2679         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2680         if (!status) {
2681                 update_changeattr(old_dir, &res.old_cinfo);
2682                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2683                 update_changeattr(new_dir, &res.new_cinfo);
2684                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2685         }
2686 out:
2687         nfs_free_fattr(res.new_fattr);
2688         nfs_free_fattr(res.old_fattr);
2689         return status;
2690 }
2691
2692 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2693                 struct inode *new_dir, struct qstr *new_name)
2694 {
2695         struct nfs4_exception exception = { };
2696         int err;
2697         do {
2698                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2699                                 _nfs4_proc_rename(old_dir, old_name,
2700                                         new_dir, new_name),
2701                                 &exception);
2702         } while (exception.retry);
2703         return err;
2704 }
2705
2706 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2707 {
2708         struct nfs_server *server = NFS_SERVER(inode);
2709         struct nfs4_link_arg arg = {
2710                 .fh     = NFS_FH(inode),
2711                 .dir_fh = NFS_FH(dir),
2712                 .name   = name,
2713                 .bitmask = server->attr_bitmask,
2714         };
2715         struct nfs4_link_res res = {
2716                 .server = server,
2717         };
2718         struct rpc_message msg = {
2719                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2720                 .rpc_argp = &arg,
2721                 .rpc_resp = &res,
2722         };
2723         int status = -ENOMEM;
2724
2725         res.fattr = nfs_alloc_fattr();
2726         res.dir_attr = nfs_alloc_fattr();
2727         if (res.fattr == NULL || res.dir_attr == NULL)
2728                 goto out;
2729
2730         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2731         if (!status) {
2732                 update_changeattr(dir, &res.cinfo);
2733                 nfs_post_op_update_inode(dir, res.dir_attr);
2734                 nfs_post_op_update_inode(inode, res.fattr);
2735         }
2736 out:
2737         nfs_free_fattr(res.dir_attr);
2738         nfs_free_fattr(res.fattr);
2739         return status;
2740 }
2741
2742 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2743 {
2744         struct nfs4_exception exception = { };
2745         int err;
2746         do {
2747                 err = nfs4_handle_exception(NFS_SERVER(inode),
2748                                 _nfs4_proc_link(inode, dir, name),
2749                                 &exception);
2750         } while (exception.retry);
2751         return err;
2752 }
2753
2754 struct nfs4_createdata {
2755         struct rpc_message msg;
2756         struct nfs4_create_arg arg;
2757         struct nfs4_create_res res;
2758         struct nfs_fh fh;
2759         struct nfs_fattr fattr;
2760         struct nfs_fattr dir_fattr;
2761 };
2762
2763 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2764                 struct qstr *name, struct iattr *sattr, u32 ftype)
2765 {
2766         struct nfs4_createdata *data;
2767
2768         data = kzalloc(sizeof(*data), GFP_KERNEL);
2769         if (data != NULL) {
2770                 struct nfs_server *server = NFS_SERVER(dir);
2771
2772                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2773                 data->msg.rpc_argp = &data->arg;
2774                 data->msg.rpc_resp = &data->res;
2775                 data->arg.dir_fh = NFS_FH(dir);
2776                 data->arg.server = server;
2777                 data->arg.name = name;
2778                 data->arg.attrs = sattr;
2779                 data->arg.ftype = ftype;
2780                 data->arg.bitmask = server->attr_bitmask;
2781                 data->res.server = server;
2782                 data->res.fh = &data->fh;
2783                 data->res.fattr = &data->fattr;
2784                 data->res.dir_fattr = &data->dir_fattr;
2785                 nfs_fattr_init(data->res.fattr);
2786                 nfs_fattr_init(data->res.dir_fattr);
2787         }
2788         return data;
2789 }
2790
2791 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2792 {
2793         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2794                                     &data->arg, &data->res, 1);
2795         if (status == 0) {
2796                 update_changeattr(dir, &data->res.dir_cinfo);
2797                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2798                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2799         }
2800         return status;
2801 }
2802
2803 static void nfs4_free_createdata(struct nfs4_createdata *data)
2804 {
2805         kfree(data);
2806 }
2807
2808 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2809                 struct page *page, unsigned int len, struct iattr *sattr)
2810 {
2811         struct nfs4_createdata *data;
2812         int status = -ENAMETOOLONG;
2813
2814         if (len > NFS4_MAXPATHLEN)
2815                 goto out;
2816
2817         status = -ENOMEM;
2818         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2819         if (data == NULL)
2820                 goto out;
2821
2822         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2823         data->arg.u.symlink.pages = &page;
2824         data->arg.u.symlink.len = len;
2825
2826         status = nfs4_do_create(dir, dentry, data);
2827
2828         nfs4_free_createdata(data);
2829 out:
2830         return status;
2831 }
2832
2833 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2834                 struct page *page, unsigned int len, struct iattr *sattr)
2835 {
2836         struct nfs4_exception exception = { };
2837         int err;
2838         do {
2839                 err = nfs4_handle_exception(NFS_SERVER(dir),
2840                                 _nfs4_proc_symlink(dir, dentry, page,
2841                                                         len, sattr),
2842                                 &exception);
2843         } while (exception.retry);
2844         return err;
2845 }
2846
2847 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2848                 struct iattr *sattr)
2849 {
2850         struct nfs4_createdata *data;
2851         int status = -ENOMEM;
2852
2853         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2854         if (data == NULL)
2855                 goto out;
2856
2857         status = nfs4_do_create(dir, dentry, data);
2858
2859         nfs4_free_createdata(data);
2860 out:
2861         return status;
2862 }
2863
2864 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2865                 struct iattr *sattr)
2866 {
2867         struct nfs4_exception exception = { };
2868         int err;
2869         do {
2870                 err = nfs4_handle_exception(NFS_SERVER(dir),
2871                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2872                                 &exception);
2873         } while (exception.retry);
2874         return err;
2875 }
2876
2877 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2878                   u64 cookie, struct page *page, unsigned int count, int plus)
2879 {
2880         struct inode            *dir = dentry->d_inode;
2881         struct nfs4_readdir_arg args = {
2882                 .fh = NFS_FH(dir),
2883                 .pages = &page,
2884                 .pgbase = 0,
2885                 .count = count,
2886                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2887         };
2888         struct nfs4_readdir_res res;
2889         struct rpc_message msg = {
2890                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2891                 .rpc_argp = &args,
2892                 .rpc_resp = &res,
2893                 .rpc_cred = cred,
2894         };
2895         int                     status;
2896
2897         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2898                         dentry->d_parent->d_name.name,
2899                         dentry->d_name.name,
2900                         (unsigned long long)cookie);
2901         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2902         res.pgbase = args.pgbase;
2903         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2904         if (status == 0)
2905                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2906
2907         nfs_invalidate_atime(dir);
2908
2909         dprintk("%s: returns %d\n", __func__, status);
2910         return status;
2911 }
2912
2913 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2914                   u64 cookie, struct page *page, unsigned int count, int plus)
2915 {
2916         struct nfs4_exception exception = { };
2917         int err;
2918         do {
2919                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2920                                 _nfs4_proc_readdir(dentry, cred, cookie,
2921                                         page, count, plus),
2922                                 &exception);
2923         } while (exception.retry);
2924         return err;
2925 }
2926
2927 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2928                 struct iattr *sattr, dev_t rdev)
2929 {
2930         struct nfs4_createdata *data;
2931         int mode = sattr->ia_mode;
2932         int status = -ENOMEM;
2933
2934         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2935         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2936
2937         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2938         if (data == NULL)
2939                 goto out;
2940
2941         if (S_ISFIFO(mode))
2942                 data->arg.ftype = NF4FIFO;
2943         else if (S_ISBLK(mode)) {
2944                 data->arg.ftype = NF4BLK;
2945                 data->arg.u.device.specdata1 = MAJOR(rdev);
2946                 data->arg.u.device.specdata2 = MINOR(rdev);
2947         }
2948         else if (S_ISCHR(mode)) {
2949                 data->arg.ftype = NF4CHR;
2950                 data->arg.u.device.specdata1 = MAJOR(rdev);
2951                 data->arg.u.device.specdata2 = MINOR(rdev);
2952         }
2953
2954         status = nfs4_do_create(dir, dentry, data);
2955
2956         nfs4_free_createdata(data);
2957 out:
2958         return status;
2959 }
2960
2961 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2962                 struct iattr *sattr, dev_t rdev)
2963 {
2964         struct nfs4_exception exception = { };
2965         int err;
2966         do {
2967                 err = nfs4_handle_exception(NFS_SERVER(dir),
2968                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2969                                 &exception);
2970         } while (exception.retry);
2971         return err;
2972 }
2973
2974 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2975                  struct nfs_fsstat *fsstat)
2976 {
2977         struct nfs4_statfs_arg args = {
2978                 .fh = fhandle,
2979                 .bitmask = server->attr_bitmask,
2980         };
2981         struct nfs4_statfs_res res = {
2982                 .fsstat = fsstat,
2983         };
2984         struct rpc_message msg = {
2985                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2986                 .rpc_argp = &args,
2987                 .rpc_resp = &res,
2988         };
2989
2990         nfs_fattr_init(fsstat->fattr);
2991         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2992 }
2993
2994 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2995 {
2996         struct nfs4_exception exception = { };
2997         int err;
2998         do {
2999                 err = nfs4_handle_exception(server,
3000                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3001                                 &exception);
3002         } while (exception.retry);
3003         return err;
3004 }
3005
3006 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3007                 struct nfs_fsinfo *fsinfo)
3008 {
3009         struct nfs4_fsinfo_arg args = {
3010                 .fh = fhandle,
3011                 .bitmask = server->attr_bitmask,
3012         };
3013         struct nfs4_fsinfo_res res = {
3014                 .fsinfo = fsinfo,
3015         };
3016         struct rpc_message msg = {
3017                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3018                 .rpc_argp = &args,
3019                 .rpc_resp = &res,
3020         };
3021
3022         return nfs4_call_sync(server, &msg, &args, &res, 0);
3023 }
3024
3025 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3026 {
3027         struct nfs4_exception exception = { };
3028         int err;
3029
3030         do {
3031                 err = nfs4_handle_exception(server,
3032                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3033                                 &exception);
3034         } while (exception.retry);
3035         return err;
3036 }
3037
3038 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3039 {
3040         nfs_fattr_init(fsinfo->fattr);
3041         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3042 }
3043
3044 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3045                 struct nfs_pathconf *pathconf)
3046 {
3047         struct nfs4_pathconf_arg args = {
3048                 .fh = fhandle,
3049                 .bitmask = server->attr_bitmask,
3050         };
3051         struct nfs4_pathconf_res res = {
3052                 .pathconf = pathconf,
3053         };
3054         struct rpc_message msg = {
3055                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3056                 .rpc_argp = &args,
3057                 .rpc_resp = &res,
3058         };
3059
3060         /* None of the pathconf attributes are mandatory to implement */
3061         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3062                 memset(pathconf, 0, sizeof(*pathconf));
3063                 return 0;
3064         }
3065
3066         nfs_fattr_init(pathconf->fattr);
3067         return nfs4_call_sync(server, &msg, &args, &res, 0);
3068 }
3069
3070 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3071                 struct nfs_pathconf *pathconf)
3072 {
3073         struct nfs4_exception exception = { };
3074         int err;
3075
3076         do {
3077                 err = nfs4_handle_exception(server,
3078                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3079                                 &exception);
3080         } while (exception.retry);
3081         return err;
3082 }
3083
3084 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3085 {
3086         struct nfs_server *server = NFS_SERVER(data->inode);
3087
3088         dprintk("--> %s\n", __func__);
3089
3090         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
3091
3092         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3093                 nfs_restart_rpc(task, server->nfs_client);
3094                 return -EAGAIN;
3095         }
3096
3097         nfs_invalidate_atime(data->inode);
3098         if (task->tk_status > 0)
3099                 renew_lease(server, data->timestamp);
3100         return 0;
3101 }
3102
3103 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3104 {
3105         data->timestamp   = jiffies;
3106         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3107 }
3108
3109 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3110 {
3111         struct inode *inode = data->inode;
3112
3113         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3114                            task->tk_status);
3115
3116         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3117                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3118                 return -EAGAIN;
3119         }
3120         if (task->tk_status >= 0) {
3121                 renew_lease(NFS_SERVER(inode), data->timestamp);
3122                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3123         }
3124         return 0;
3125 }
3126
3127 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3128 {
3129         struct nfs_server *server = NFS_SERVER(data->inode);
3130
3131         data->args.bitmask = server->cache_consistency_bitmask;
3132         data->res.server = server;
3133         data->timestamp   = jiffies;
3134
3135         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3136 }
3137
3138 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3139 {
3140         struct inode *inode = data->inode;
3141
3142         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3143                            task->tk_status);
3144         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3145                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3146                 return -EAGAIN;
3147         }
3148         nfs_refresh_inode(inode, data->res.fattr);
3149         return 0;
3150 }
3151
3152 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3153 {
3154         struct nfs_server *server = NFS_SERVER(data->inode);
3155
3156         data->args.bitmask = server->cache_consistency_bitmask;
3157         data->res.server = server;
3158         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3159 }
3160
3161 struct nfs4_renewdata {
3162         struct nfs_client       *client;
3163         unsigned long           timestamp;
3164 };
3165
3166 /*
3167  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3168  * standalone procedure for queueing an asynchronous RENEW.
3169  */
3170 static void nfs4_renew_release(void *calldata)
3171 {
3172         struct nfs4_renewdata *data = calldata;
3173         struct nfs_client *clp = data->client;
3174
3175         if (atomic_read(&clp->cl_count) > 1)
3176                 nfs4_schedule_state_renewal(clp);
3177         nfs_put_client(clp);
3178         kfree(data);
3179 }
3180
3181 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3182 {
3183         struct nfs4_renewdata *data = calldata;
3184         struct nfs_client *clp = data->client;
3185         unsigned long timestamp = data->timestamp;
3186
3187         if (task->tk_status < 0) {
3188                 /* Unless we're shutting down, schedule state recovery! */
3189                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3190                         nfs4_schedule_state_recovery(clp);
3191                 return;
3192         }
3193         spin_lock(&clp->cl_lock);
3194         if (time_before(clp->cl_last_renewal,timestamp))
3195                 clp->cl_last_renewal = timestamp;
3196         spin_unlock(&clp->cl_lock);
3197 }
3198
3199 static const struct rpc_call_ops nfs4_renew_ops = {
3200         .rpc_call_done = nfs4_renew_done,
3201         .rpc_release = nfs4_renew_release,
3202 };
3203
3204 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3205 {
3206         struct rpc_message msg = {
3207                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3208                 .rpc_argp       = clp,
3209                 .rpc_cred       = cred,
3210         };
3211         struct nfs4_renewdata *data;
3212
3213         if (!atomic_inc_not_zero(&clp->cl_count))
3214                 return -EIO;
3215         data = kmalloc(sizeof(*data), GFP_KERNEL);
3216         if (data == NULL)
3217                 return -ENOMEM;
3218         data->client = clp;
3219         data->timestamp = jiffies;
3220         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3221                         &nfs4_renew_ops, data);
3222 }
3223
3224 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3225 {
3226         struct rpc_message msg = {
3227                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3228                 .rpc_argp       = clp,
3229                 .rpc_cred       = cred,
3230         };
3231         unsigned long now = jiffies;
3232         int status;
3233
3234         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3235         if (status < 0)
3236                 return status;
3237         spin_lock(&clp->cl_lock);
3238         if (time_before(clp->cl_last_renewal,now))
3239                 clp->cl_last_renewal = now;
3240         spin_unlock(&clp->cl_lock);
3241         return 0;
3242 }
3243
3244 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3245 {
3246         return (server->caps & NFS_CAP_ACLS)
3247                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3248                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3249 }
3250
3251 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3252  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3253  * the stack.
3254  */
3255 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3256
3257 static void buf_to_pages(const void *buf, size_t buflen,
3258                 struct page **pages, unsigned int *pgbase)
3259 {
3260         const void *p = buf;
3261
3262         *pgbase = offset_in_page(buf);
3263         p -= *pgbase;
3264         while (p < buf + buflen) {
3265                 *(pages++) = virt_to_page(p);
3266                 p += PAGE_CACHE_SIZE;
3267         }
3268 }
3269
3270 struct nfs4_cached_acl {
3271         int cached;
3272         size_t len;
3273         char data[0];
3274 };
3275
3276 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3277 {
3278         struct nfs_inode *nfsi = NFS_I(inode);
3279
3280         spin_lock(&inode->i_lock);
3281         kfree(nfsi->nfs4_acl);
3282         nfsi->nfs4_acl = acl;
3283         spin_unlock(&inode->i_lock);
3284 }
3285
3286 static void nfs4_zap_acl_attr(struct inode *inode)
3287 {
3288         nfs4_set_cached_acl(inode, NULL);
3289 }
3290
3291 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3292 {
3293         struct nfs_inode *nfsi = NFS_I(inode);
3294         struct nfs4_cached_acl *acl;
3295         int ret = -ENOENT;
3296
3297         spin_lock(&inode->i_lock);
3298         acl = nfsi->nfs4_acl;
3299         if (acl == NULL)
3300                 goto out;
3301         if (buf == NULL) /* user is just asking for length */
3302                 goto out_len;
3303         if (acl->cached == 0)
3304                 goto out;
3305         ret = -ERANGE; /* see getxattr(2) man page */
3306         if (acl->len > buflen)
3307                 goto out;
3308         memcpy(buf, acl->data, acl->len);
3309 out_len:
3310         ret = acl->len;
3311 out:
3312         spin_unlock(&inode->i_lock);
3313         return ret;
3314 }
3315
3316 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3317 {
3318         struct nfs4_cached_acl *acl;
3319
3320         if (buf && acl_len <= PAGE_SIZE) {
3321                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3322                 if (acl == NULL)
3323                         goto out;
3324                 acl->cached = 1;
3325                 memcpy(acl->data, buf, acl_len);
3326         } else {
3327                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3328                 if (acl == NULL)
3329                         goto out;
3330                 acl->cached = 0;
3331         }
3332         acl->len = acl_len;
3333 out:
3334         nfs4_set_cached_acl(inode, acl);
3335 }
3336
3337 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3338 {
3339         struct page *pages[NFS4ACL_MAXPAGES];
3340         struct nfs_getaclargs args = {
3341                 .fh = NFS_FH(inode),
3342                 .acl_pages = pages,
3343                 .acl_len = buflen,
3344         };
3345         struct nfs_getaclres res = {
3346                 .acl_len = buflen,
3347         };
3348         void *resp_buf;
3349         struct rpc_message msg = {
3350                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3351                 .rpc_argp = &args,
3352                 .rpc_resp = &res,
3353         };
3354         struct page *localpage = NULL;
3355         int ret;
3356
3357         if (buflen < PAGE_SIZE) {
3358                 /* As long as we're doing a round trip to the server anyway,
3359                  * let's be prepared for a page of acl data. */
3360                 localpage = alloc_page(GFP_KERNEL);
3361                 resp_buf = page_address(localpage);
3362                 if (localpage == NULL)
3363                         return -ENOMEM;
3364                 args.acl_pages[0] = localpage;
3365                 args.acl_pgbase = 0;
3366                 args.acl_len = PAGE_SIZE;
3367         } else {
3368                 resp_buf = buf;
3369                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3370         }
3371         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3372         if (ret)
3373                 goto out_free;
3374         if (res.acl_len > args.acl_len)
3375                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3376         else
3377                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3378         if (buf) {
3379                 ret = -ERANGE;
3380                 if (res.acl_len > buflen)
3381                         goto out_free;
3382                 if (localpage)
3383                         memcpy(buf, resp_buf, res.acl_len);
3384         }
3385         ret = res.acl_len;
3386 out_free:
3387         if (localpage)
3388                 __free_page(localpage);
3389         return ret;
3390 }
3391
3392 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3393 {
3394         struct nfs4_exception exception = { };
3395         ssize_t ret;
3396         do {
3397                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3398                 if (ret >= 0)
3399                         break;
3400                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3401         } while (exception.retry);
3402         return ret;
3403 }
3404
3405 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3406 {
3407         struct nfs_server *server = NFS_SERVER(inode);
3408         int ret;
3409
3410         if (!nfs4_server_supports_acls(server))
3411                 return -EOPNOTSUPP;
3412         ret = nfs_revalidate_inode(server, inode);
3413         if (ret < 0)
3414                 return ret;
3415         ret = nfs4_read_cached_acl(inode, buf, buflen);
3416         if (ret != -ENOENT)
3417                 return ret;
3418         return nfs4_get_acl_uncached(inode, buf, buflen);
3419 }
3420
3421 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3422 {
3423         struct nfs_server *server = NFS_SERVER(inode);
3424         struct page *pages[NFS4ACL_MAXPAGES];
3425         struct nfs_setaclargs arg = {
3426                 .fh             = NFS_FH(inode),
3427                 .acl_pages      = pages,
3428                 .acl_len        = buflen,
3429         };
3430         struct nfs_setaclres res;
3431         struct rpc_message msg = {
3432                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3433                 .rpc_argp       = &arg,
3434                 .rpc_resp       = &res,
3435         };
3436         int ret;
3437
3438         if (!nfs4_server_supports_acls(server))
3439                 return -EOPNOTSUPP;
3440         nfs_inode_return_delegation(inode);
3441         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3442         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3443         nfs_access_zap_cache(inode);
3444         nfs_zap_acl_cache(inode);
3445         return ret;
3446 }
3447
3448 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3449 {
3450         struct nfs4_exception exception = { };
3451         int err;
3452         do {
3453                 err = nfs4_handle_exception(NFS_SERVER(inode),
3454                                 __nfs4_proc_set_acl(inode, buf, buflen),
3455                                 &exception);
3456         } while (exception.retry);
3457         return err;
3458 }
3459
3460 static int
3461 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3462 {
3463         struct nfs_client *clp = server->nfs_client;
3464
3465         if (task->tk_status >= 0)
3466                 return 0;
3467         switch(task->tk_status) {
3468                 case -NFS4ERR_ADMIN_REVOKED:
3469                 case -NFS4ERR_BAD_STATEID:
3470                 case -NFS4ERR_OPENMODE:
3471                         if (state == NULL)
3472                                 break;
3473                         nfs4_state_mark_reclaim_nograce(clp, state);
3474                         goto do_state_recovery;
3475                 case -NFS4ERR_STALE_STATEID:
3476                         if (state == NULL)
3477                                 break;
3478                         nfs4_state_mark_reclaim_reboot(clp, state);
3479                 case -NFS4ERR_STALE_CLIENTID:
3480                 case -NFS4ERR_EXPIRED:
3481                         goto do_state_recovery;
3482 #if defined(CONFIG_NFS_V4_1)
3483                 case -NFS4ERR_BADSESSION:
3484                 case -NFS4ERR_BADSLOT:
3485                 case -NFS4ERR_BAD_HIGH_SLOT:
3486                 case -NFS4ERR_DEADSESSION:
3487                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3488                 case -NFS4ERR_SEQ_FALSE_RETRY:
3489                 case -NFS4ERR_SEQ_MISORDERED:
3490                         dprintk("%s ERROR %d, Reset session\n", __func__,
3491                                 task->tk_status);
3492                         nfs4_schedule_state_recovery(clp);
3493                         task->tk_status = 0;
3494                         return -EAGAIN;
3495 #endif /* CONFIG_NFS_V4_1 */
3496                 case -NFS4ERR_DELAY:
3497                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3498                 case -NFS4ERR_GRACE:
3499                 case -EKEYEXPIRED:
3500                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3501                         task->tk_status = 0;
3502                         return -EAGAIN;
3503                 case -NFS4ERR_OLD_STATEID:
3504                         task->tk_status = 0;
3505                         return -EAGAIN;
3506         }
3507         task->tk_status = nfs4_map_errors(task->tk_status);
3508         return 0;
3509 do_state_recovery:
3510         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3511         nfs4_schedule_state_recovery(clp);
3512         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3513                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3514         task->tk_status = 0;
3515         return -EAGAIN;
3516 }
3517
3518 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3519                 unsigned short port, struct rpc_cred *cred,
3520                 struct nfs4_setclientid_res *res)
3521 {
3522         nfs4_verifier sc_verifier;
3523         struct nfs4_setclientid setclientid = {
3524                 .sc_verifier = &sc_verifier,
3525                 .sc_prog = program,
3526         };
3527         struct rpc_message msg = {
3528                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3529                 .rpc_argp = &setclientid,
3530                 .rpc_resp = res,
3531                 .rpc_cred = cred,
3532         };
3533         __be32 *p;
3534         int loop = 0;
3535         int status;
3536
3537         p = (__be32*)sc_verifier.data;
3538         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3539         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3540
3541         for(;;) {
3542                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3543                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3544                                 clp->cl_ipaddr,
3545                                 rpc_peeraddr2str(clp->cl_rpcclient,
3546                                                         RPC_DISPLAY_ADDR),
3547                                 rpc_peeraddr2str(clp->cl_rpcclient,
3548                                                         RPC_DISPLAY_PROTO),
3549                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3550                                 clp->cl_id_uniquifier);
3551                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3552                                 sizeof(setclientid.sc_netid),
3553                                 rpc_peeraddr2str(clp->cl_rpcclient,
3554                                                         RPC_DISPLAY_NETID));
3555                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3556                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3557                                 clp->cl_ipaddr, port >> 8, port & 255);
3558
3559                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3560                 if (status != -NFS4ERR_CLID_INUSE)
3561                         break;
3562                 if (signalled())
3563                         break;
3564                 if (loop++ & 1)
3565                         ssleep(clp->cl_lease_time + 1);
3566                 else
3567                         if (++clp->cl_id_uniquifier == 0)
3568                                 break;
3569         }
3570         return status;
3571 }
3572
3573 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3574                 struct nfs4_setclientid_res *arg,
3575                 struct rpc_cred *cred)
3576 {
3577         struct nfs_fsinfo fsinfo;
3578         struct rpc_message msg = {
3579                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3580                 .rpc_argp = arg,
3581                 .rpc_resp = &fsinfo,
3582                 .rpc_cred = cred,
3583         };
3584         unsigned long now;
3585         int status;
3586
3587         now = jiffies;
3588         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3589         if (status == 0) {
3590                 spin_lock(&clp->cl_lock);
3591                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3592                 clp->cl_last_renewal = now;
3593                 spin_unlock(&clp->cl_lock);
3594         }
3595         return status;
3596 }
3597
3598 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3599                 struct nfs4_setclientid_res *arg,
3600                 struct rpc_cred *cred)
3601 {
3602         long timeout = 0;
3603         int err;
3604         do {
3605                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3606                 switch (err) {
3607                         case 0:
3608                                 return err;
3609                         case -NFS4ERR_RESOURCE:
3610                                 /* The IBM lawyers misread another document! */
3611                         case -NFS4ERR_DELAY:
3612                         case -EKEYEXPIRED:
3613                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3614                 }
3615         } while (err == 0);
3616         return err;
3617 }
3618
3619 struct nfs4_delegreturndata {
3620         struct nfs4_delegreturnargs args;
3621         struct nfs4_delegreturnres res;
3622         struct nfs_fh fh;
3623         nfs4_stateid stateid;
3624         unsigned long timestamp;
3625         struct nfs_fattr fattr;
3626         int rpc_status;
3627 };
3628
3629 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3630 {
3631         struct nfs4_delegreturndata *data = calldata;
3632
3633         nfs4_sequence_done(data->res.server, &data->res.seq_res,
3634                         task->tk_status);
3635
3636         switch (task->tk_status) {
3637         case -NFS4ERR_STALE_STATEID:
3638         case -NFS4ERR_EXPIRED:
3639         case 0:
3640                 renew_lease(data->res.server, data->timestamp);
3641                 break;
3642         default:
3643                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3644                                 -EAGAIN) {
3645                         nfs_restart_rpc(task, data->res.server->nfs_client);
3646                         return;
3647                 }
3648         }
3649         data->rpc_status = task->tk_status;
3650 }
3651
3652 static void nfs4_delegreturn_release(void *calldata)
3653 {
3654         kfree(calldata);
3655 }
3656
3657 #if defined(CONFIG_NFS_V4_1)
3658 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3659 {
3660         struct nfs4_delegreturndata *d_data;
3661
3662         d_data = (struct nfs4_delegreturndata *)data;
3663
3664         if (nfs4_setup_sequence(d_data->res.server,
3665                                 &d_data->args.seq_args,
3666                                 &d_data->res.seq_res, 1, task))
3667                 return;
3668         rpc_call_start(task);
3669 }
3670 #endif /* CONFIG_NFS_V4_1 */
3671
3672 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3673 #if defined(CONFIG_NFS_V4_1)
3674         .rpc_call_prepare = nfs4_delegreturn_prepare,
3675 #endif /* CONFIG_NFS_V4_1 */
3676         .rpc_call_done = nfs4_delegreturn_done,
3677         .rpc_release = nfs4_delegreturn_release,
3678 };
3679
3680 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3681 {
3682         struct nfs4_delegreturndata *data;
3683         struct nfs_server *server = NFS_SERVER(inode);
3684         struct rpc_task *task;
3685         struct rpc_message msg = {
3686                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3687                 .rpc_cred = cred,
3688         };
3689         struct rpc_task_setup task_setup_data = {
3690                 .rpc_client = server->client,
3691                 .rpc_message = &msg,
3692                 .callback_ops = &nfs4_delegreturn_ops,
3693                 .flags = RPC_TASK_ASYNC,
3694         };
3695         int status = 0;
3696
3697         data = kzalloc(sizeof(*data), GFP_NOFS);
3698         if (data == NULL)
3699                 return -ENOMEM;
3700         data->args.fhandle = &data->fh;
3701         data->args.stateid = &data->stateid;
3702         data->args.bitmask = server->attr_bitmask;
3703         nfs_copy_fh(&data->fh, NFS_FH(inode));
3704         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3705         data->res.fattr = &data->fattr;
3706         data->res.server = server;
3707         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3708         nfs_fattr_init(data->res.fattr);
3709         data->timestamp = jiffies;
3710         data->rpc_status = 0;
3711
3712         task_setup_data.callback_data = data;
3713         msg.rpc_argp = &data->args,
3714         msg.rpc_resp = &data->res,
3715         task = rpc_run_task(&task_setup_data);
3716         if (IS_ERR(task))
3717                 return PTR_ERR(task);
3718         if (!issync)
3719                 goto out;
3720         status = nfs4_wait_for_completion_rpc_task(task);
3721         if (status != 0)
3722                 goto out;
3723         status = data->rpc_status;
3724         if (status != 0)
3725                 goto out;
3726         nfs_refresh_inode(inode, &data->fattr);
3727 out:
3728         rpc_put_task(task);
3729         return status;
3730 }
3731
3732 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3733 {
3734         struct nfs_server *server = NFS_SERVER(inode);
3735         struct nfs4_exception exception = { };
3736         int err;
3737         do {
3738                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3739                 switch (err) {
3740                         case -NFS4ERR_STALE_STATEID:
3741                         case -NFS4ERR_EXPIRED:
3742                         case 0:
3743                                 return 0;
3744                 }
3745                 err = nfs4_handle_exception(server, err, &exception);
3746         } while (exception.retry);
3747         return err;
3748 }
3749
3750 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3751 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3752
3753 /*
3754  * sleep, with exponential backoff, and retry the LOCK operation.
3755  */
3756 static unsigned long
3757 nfs4_set_lock_task_retry(unsigned long timeout)
3758 {
3759         schedule_timeout_killable(timeout);
3760         timeout <<= 1;
3761         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3762                 return NFS4_LOCK_MAXTIMEOUT;
3763         return timeout;
3764 }
3765
3766 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3767 {
3768         struct inode *inode = state->inode;
3769         struct nfs_server *server = NFS_SERVER(inode);
3770         struct nfs_client *clp = server->nfs_client;
3771         struct nfs_lockt_args arg = {
3772                 .fh = NFS_FH(inode),
3773                 .fl = request,
3774         };
3775         struct nfs_lockt_res res = {
3776                 .denied = request,
3777         };
3778         struct rpc_message msg = {
3779                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3780                 .rpc_argp       = &arg,
3781                 .rpc_resp       = &res,
3782                 .rpc_cred       = state->owner->so_cred,
3783         };
3784         struct nfs4_lock_state *lsp;
3785         int status;
3786
3787         arg.lock_owner.clientid = clp->cl_clientid;
3788         status = nfs4_set_lock_state(state, request);
3789         if (status != 0)
3790                 goto out;
3791         lsp = request->fl_u.nfs4_fl.owner;
3792         arg.lock_owner.id = lsp->ls_id.id;
3793         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3794         switch (status) {
3795                 case 0:
3796                         request->fl_type = F_UNLCK;
3797                         break;
3798                 case -NFS4ERR_DENIED:
3799                         status = 0;
3800         }
3801         request->fl_ops->fl_release_private(request);
3802 out:
3803         return status;
3804 }
3805
3806 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3807 {
3808         struct nfs4_exception exception = { };
3809         int err;
3810
3811         do {
3812                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3813                                 _nfs4_proc_getlk(state, cmd, request),
3814                                 &exception);
3815         } while (exception.retry);
3816         return err;
3817 }
3818
3819 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3820 {
3821         int res = 0;
3822         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3823                 case FL_POSIX:
3824                         res = posix_lock_file_wait(file, fl);
3825                         break;
3826                 case FL_FLOCK:
3827                         res = flock_lock_file_wait(file, fl);
3828                         break;
3829                 default:
3830                         BUG();
3831         }
3832         return res;
3833 }
3834
3835 struct nfs4_unlockdata {
3836         struct nfs_locku_args arg;
3837         struct nfs_locku_res res;
3838         struct nfs4_lock_state *lsp;
3839         struct nfs_open_context *ctx;
3840         struct file_lock fl;
3841         const struct nfs_server *server;
3842         unsigned long timestamp;
3843 };
3844
3845 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3846                 struct nfs_open_context *ctx,
3847                 struct nfs4_lock_state *lsp,
3848                 struct nfs_seqid *seqid)
3849 {
3850         struct nfs4_unlockdata *p;
3851         struct inode *inode = lsp->ls_state->inode;
3852
3853         p = kzalloc(sizeof(*p), GFP_NOFS);
3854         if (p == NULL)
3855                 return NULL;
3856         p->arg.fh = NFS_FH(inode);
3857         p->arg.fl = &p->fl;
3858         p->arg.seqid = seqid;
3859         p->res.seqid = seqid;
3860         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3861         p->arg.stateid = &lsp->ls_stateid;
3862         p->lsp = lsp;
3863         atomic_inc(&lsp->ls_count);
3864         /* Ensure we don't close file until we're done freeing locks! */
3865         p->ctx = get_nfs_open_context(ctx);
3866         memcpy(&p->fl, fl, sizeof(p->fl));
3867         p->server = NFS_SERVER(inode);
3868         return p;
3869 }
3870
3871 static void nfs4_locku_release_calldata(void *data)
3872 {
3873         struct nfs4_unlockdata *calldata = data;
3874         nfs_free_seqid(calldata->arg.seqid);
3875         nfs4_put_lock_state(calldata->lsp);
3876         put_nfs_open_context(calldata->ctx);
3877         kfree(calldata);
3878 }
3879
3880 static void nfs4_locku_done(struct rpc_task *task, void *data)
3881 {
3882         struct nfs4_unlockdata *calldata = data;
3883
3884         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3885                            task->tk_status);
3886         if (RPC_ASSASSINATED(task))
3887                 return;
3888         switch (task->tk_status) {
3889                 case 0:
3890                         memcpy(calldata->lsp->ls_stateid.data,
3891                                         calldata->res.stateid.data,
3892                                         sizeof(calldata->lsp->ls_stateid.data));
3893                         renew_lease(calldata->server, calldata->timestamp);
3894                         break;
3895                 case -NFS4ERR_BAD_STATEID:
3896                 case -NFS4ERR_OLD_STATEID:
3897                 case -NFS4ERR_STALE_STATEID:
3898                 case -NFS4ERR_EXPIRED:
3899                         break;
3900                 default:
3901                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3902                                 nfs_restart_rpc(task,
3903                                                  calldata->server->nfs_client);
3904         }
3905 }
3906
3907 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3908 {
3909         struct nfs4_unlockdata *calldata = data;
3910
3911         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3912                 return;
3913         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3914                 /* Note: exit _without_ running nfs4_locku_done */
3915                 task->tk_action = NULL;
3916                 return;
3917         }
3918         calldata->timestamp = jiffies;
3919         if (nfs4_setup_sequence(calldata->server,
3920                                 &calldata->arg.seq_args,
3921                                 &calldata->res.seq_res, 1, task))
3922                 return;
3923         rpc_call_start(task);
3924 }
3925
3926 static const struct rpc_call_ops nfs4_locku_ops = {
3927         .rpc_call_prepare = nfs4_locku_prepare,
3928         .rpc_call_done = nfs4_locku_done,
3929         .rpc_release = nfs4_locku_release_calldata,
3930 };
3931
3932 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3933                 struct nfs_open_context *ctx,
3934                 struct nfs4_lock_state *lsp,
3935                 struct nfs_seqid *seqid)
3936 {
3937         struct nfs4_unlockdata *data;
3938         struct rpc_message msg = {
3939                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3940                 .rpc_cred = ctx->cred,
3941         };
3942         struct rpc_task_setup task_setup_data = {
3943                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3944                 .rpc_message = &msg,
3945                 .callback_ops = &nfs4_locku_ops,
3946                 .workqueue = nfsiod_workqueue,
3947                 .flags = RPC_TASK_ASYNC,
3948         };
3949
3950         /* Ensure this is an unlock - when canceling a lock, the
3951          * canceled lock is passed in, and it won't be an unlock.
3952          */
3953         fl->fl_type = F_UNLCK;
3954
3955         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3956         if (data == NULL) {
3957                 nfs_free_seqid(seqid);
3958                 return ERR_PTR(-ENOMEM);
3959         }
3960
3961         msg.rpc_argp = &data->arg,
3962         msg.rpc_resp = &data->res,
3963         task_setup_data.callback_data = data;
3964         return rpc_run_task(&task_setup_data);
3965 }
3966
3967 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3968 {
3969         struct nfs_inode *nfsi = NFS_I(state->inode);
3970         struct nfs_seqid *seqid;
3971         struct nfs4_lock_state *lsp;
3972         struct rpc_task *task;
3973         int status = 0;
3974         unsigned char fl_flags = request->fl_flags;
3975
3976         status = nfs4_set_lock_state(state, request);
3977         /* Unlock _before_ we do the RPC call */
3978         request->fl_flags |= FL_EXISTS;
3979         down_read(&nfsi->rwsem);
3980         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3981                 up_read(&nfsi->rwsem);
3982                 goto out;
3983         }
3984         up_read(&nfsi->rwsem);
3985         if (status != 0)
3986                 goto out;
3987         /* Is this a delegated lock? */
3988         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3989                 goto out;
3990         lsp = request->fl_u.nfs4_fl.owner;
3991         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
3992         status = -ENOMEM;
3993         if (seqid == NULL)
3994                 goto out;
3995         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3996         status = PTR_ERR(task);
3997         if (IS_ERR(task))
3998                 goto out;
3999         status = nfs4_wait_for_completion_rpc_task(task);
4000         rpc_put_task(task);
4001 out:
4002         request->fl_flags = fl_flags;
4003         return status;
4004 }
4005
4006 struct nfs4_lockdata {
4007         struct nfs_lock_args arg;
4008         struct nfs_lock_res res;
4009         struct nfs4_lock_state *lsp;
4010         struct nfs_open_context *ctx;
4011         struct file_lock fl;
4012         unsigned long timestamp;
4013         int rpc_status;
4014         int cancelled;
4015         struct nfs_server *server;
4016 };
4017
4018 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4019                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4020                 gfp_t gfp_mask)
4021 {
4022         struct nfs4_lockdata *p;
4023         struct inode *inode = lsp->ls_state->inode;
4024         struct nfs_server *server = NFS_SERVER(inode);
4025
4026         p = kzalloc(sizeof(*p), gfp_mask);
4027         if (p == NULL)
4028                 return NULL;
4029
4030         p->arg.fh = NFS_FH(inode);
4031         p->arg.fl = &p->fl;
4032         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4033         if (p->arg.open_seqid == NULL)
4034                 goto out_free;
4035         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4036         if (p->arg.lock_seqid == NULL)
4037                 goto out_free_seqid;
4038         p->arg.lock_stateid = &lsp->ls_stateid;
4039         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4040         p->arg.lock_owner.id = lsp->ls_id.id;
4041         p->res.lock_seqid = p->arg.lock_seqid;
4042         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4043         p->lsp = lsp;
4044         p->server = server;
4045         atomic_inc(&lsp->ls_count);
4046         p->ctx = get_nfs_open_context(ctx);
4047         memcpy(&p->fl, fl, sizeof(p->fl));
4048         return p;
4049 out_free_seqid:
4050         nfs_free_seqid(p->arg.open_seqid);
4051 out_free:
4052         kfree(p);
4053         return NULL;
4054 }
4055
4056 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4057 {
4058         struct nfs4_lockdata *data = calldata;
4059         struct nfs4_state *state = data->lsp->ls_state;
4060
4061         dprintk("%s: begin!\n", __func__);
4062         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4063                 return;
4064         /* Do we need to do an open_to_lock_owner? */
4065         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4066                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4067                         return;
4068                 data->arg.open_stateid = &state->stateid;
4069                 data->arg.new_lock_owner = 1;
4070                 data->res.open_seqid = data->arg.open_seqid;
4071         } else
4072                 data->arg.new_lock_owner = 0;
4073         data->timestamp = jiffies;
4074         if (nfs4_setup_sequence(data->server,
4075                                 &data->arg.seq_args,
4076                                 &data->res.seq_res, 1, task))
4077                 return;
4078         rpc_call_start(task);
4079         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4080 }
4081
4082 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4083 {
4084         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4085         nfs4_lock_prepare(task, calldata);
4086 }
4087
4088 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4089 {
4090         struct nfs4_lockdata *data = calldata;
4091
4092         dprintk("%s: begin!\n", __func__);
4093
4094         nfs4_sequence_done(data->server, &data->res.seq_res,
4095                         task->tk_status);
4096
4097         data->rpc_status = task->tk_status;
4098         if (RPC_ASSASSINATED(task))
4099                 goto out;
4100         if (data->arg.new_lock_owner != 0) {
4101                 if (data->rpc_status == 0)
4102                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4103                 else
4104                         goto out;
4105         }
4106         if (data->rpc_status == 0) {
4107                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4108                                         sizeof(data->lsp->ls_stateid.data));
4109                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4110                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4111         }
4112 out:
4113         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4114 }
4115
4116 static void nfs4_lock_release(void *calldata)
4117 {
4118         struct nfs4_lockdata *data = calldata;
4119
4120         dprintk("%s: begin!\n", __func__);
4121         nfs_free_seqid(data->arg.open_seqid);
4122         if (data->cancelled != 0) {
4123                 struct rpc_task *task;
4124                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4125                                 data->arg.lock_seqid);
4126                 if (!IS_ERR(task))
4127                         rpc_put_task(task);
4128                 dprintk("%s: cancelling lock!\n", __func__);
4129         } else
4130                 nfs_free_seqid(data->arg.lock_seqid);
4131         nfs4_put_lock_state(data->lsp);
4132         put_nfs_open_context(data->ctx);
4133         kfree(data);
4134         dprintk("%s: done!\n", __func__);
4135 }
4136
4137 static const struct rpc_call_ops nfs4_lock_ops = {
4138         .rpc_call_prepare = nfs4_lock_prepare,
4139         .rpc_call_done = nfs4_lock_done,
4140         .rpc_release = nfs4_lock_release,
4141 };
4142
4143 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4144         .rpc_call_prepare = nfs4_recover_lock_prepare,
4145         .rpc_call_done = nfs4_lock_done,
4146         .rpc_release = nfs4_lock_release,
4147 };
4148
4149 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4150 {
4151         struct nfs_client *clp = server->nfs_client;
4152         struct nfs4_state *state = lsp->ls_state;
4153
4154         switch (error) {
4155         case -NFS4ERR_ADMIN_REVOKED:
4156         case -NFS4ERR_BAD_STATEID:
4157         case -NFS4ERR_EXPIRED:
4158                 if (new_lock_owner != 0 ||
4159                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4160                         nfs4_state_mark_reclaim_nograce(clp, state);
4161                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4162                 break;
4163         case -NFS4ERR_STALE_STATEID:
4164                 if (new_lock_owner != 0 ||
4165                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4166                         nfs4_state_mark_reclaim_reboot(clp, state);
4167                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4168         };
4169 }
4170
4171 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4172 {
4173         struct nfs4_lockdata *data;
4174         struct rpc_task *task;
4175         struct rpc_message msg = {
4176                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4177                 .rpc_cred = state->owner->so_cred,
4178         };
4179         struct rpc_task_setup task_setup_data = {
4180                 .rpc_client = NFS_CLIENT(state->inode),
4181                 .rpc_message = &msg,
4182                 .callback_ops = &nfs4_lock_ops,
4183                 .workqueue = nfsiod_workqueue,
4184                 .flags = RPC_TASK_ASYNC,
4185         };
4186         int ret;
4187
4188         dprintk("%s: begin!\n", __func__);
4189         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4190                         fl->fl_u.nfs4_fl.owner,
4191                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4192         if (data == NULL)
4193                 return -ENOMEM;
4194         if (IS_SETLKW(cmd))
4195                 data->arg.block = 1;
4196         if (recovery_type > NFS_LOCK_NEW) {
4197                 if (recovery_type == NFS_LOCK_RECLAIM)
4198                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4199                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4200         }
4201         msg.rpc_argp = &data->arg,
4202         msg.rpc_resp = &data->res,
4203         task_setup_data.callback_data = data;
4204         task = rpc_run_task(&task_setup_data);
4205         if (IS_ERR(task))
4206                 return PTR_ERR(task);
4207         ret = nfs4_wait_for_completion_rpc_task(task);
4208         if (ret == 0) {
4209                 ret = data->rpc_status;
4210                 if (ret)
4211                         nfs4_handle_setlk_error(data->server, data->lsp,
4212                                         data->arg.new_lock_owner, ret);
4213         } else
4214                 data->cancelled = 1;
4215         rpc_put_task(task);
4216         dprintk("%s: done, ret = %d!\n", __func__, ret);
4217         return ret;
4218 }
4219
4220 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4221 {
4222         struct nfs_server *server = NFS_SERVER(state->inode);
4223         struct nfs4_exception exception = { };
4224         int err;
4225
4226         do {
4227                 /* Cache the lock if possible... */
4228                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4229                         return 0;
4230                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4231                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
4232                         break;
4233                 nfs4_handle_exception(server, err, &exception);
4234         } while (exception.retry);
4235         return err;
4236 }
4237
4238 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4239 {
4240         struct nfs_server *server = NFS_SERVER(state->inode);
4241         struct nfs4_exception exception = { };
4242         int err;
4243
4244         err = nfs4_set_lock_state(state, request);
4245         if (err != 0)
4246                 return err;
4247         do {
4248                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4249                         return 0;
4250                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4251                 switch (err) {
4252                 default:
4253                         goto out;
4254                 case -NFS4ERR_GRACE:
4255                 case -NFS4ERR_DELAY:
4256                 case -EKEYEXPIRED:
4257                         nfs4_handle_exception(server, err, &exception);
4258                         err = 0;
4259                 }
4260         } while (exception.retry);
4261 out:
4262         return err;
4263 }
4264
4265 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4266 {
4267         struct nfs_inode *nfsi = NFS_I(state->inode);
4268         unsigned char fl_flags = request->fl_flags;
4269         int status = -ENOLCK;
4270
4271         if ((fl_flags & FL_POSIX) &&
4272                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4273                 goto out;
4274         /* Is this a delegated open? */
4275         status = nfs4_set_lock_state(state, request);
4276         if (status != 0)
4277                 goto out;
4278         request->fl_flags |= FL_ACCESS;
4279         status = do_vfs_lock(request->fl_file, request);
4280         if (status < 0)
4281                 goto out;
4282         down_read(&nfsi->rwsem);
4283         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4284                 /* Yes: cache locks! */
4285                 /* ...but avoid races with delegation recall... */
4286                 request->fl_flags = fl_flags & ~FL_SLEEP;
4287                 status = do_vfs_lock(request->fl_file, request);
4288                 goto out_unlock;
4289         }
4290         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4291         if (status != 0)
4292                 goto out_unlock;
4293         /* Note: we always want to sleep here! */
4294         request->fl_flags = fl_flags | FL_SLEEP;
4295         if (do_vfs_lock(request->fl_file, request) < 0)
4296                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4297 out_unlock:
4298         up_read(&nfsi->rwsem);
4299 out:
4300         request->fl_flags = fl_flags;
4301         return status;
4302 }
4303
4304 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4305 {
4306         struct nfs4_exception exception = { };
4307         int err;
4308
4309         do {
4310                 err = _nfs4_proc_setlk(state, cmd, request);
4311                 if (err == -NFS4ERR_DENIED)
4312                         err = -EAGAIN;
4313                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4314                                 err, &exception);
4315         } while (exception.retry);
4316         return err;
4317 }
4318
4319 static int
4320 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4321 {
4322         struct nfs_open_context *ctx;
4323         struct nfs4_state *state;
4324         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4325         int status;
4326
4327         /* verify open state */
4328         ctx = nfs_file_open_context(filp);
4329         state = ctx->state;
4330
4331         if (request->fl_start < 0 || request->fl_end < 0)
4332                 return -EINVAL;
4333
4334         if (IS_GETLK(cmd)) {
4335                 if (state != NULL)
4336                         return nfs4_proc_getlk(state, F_GETLK, request);
4337                 return 0;
4338         }
4339
4340         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4341                 return -EINVAL;
4342
4343         if (request->fl_type == F_UNLCK) {
4344                 if (state != NULL)
4345                         return nfs4_proc_unlck(state, cmd, request);
4346                 return 0;
4347         }
4348
4349         if (state == NULL)
4350                 return -ENOLCK;
4351         do {
4352                 status = nfs4_proc_setlk(state, cmd, request);
4353                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4354                         break;
4355                 timeout = nfs4_set_lock_task_retry(timeout);
4356                 status = -ERESTARTSYS;
4357                 if (signalled())
4358                         break;
4359         } while(status < 0);
4360         return status;
4361 }
4362
4363 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4364 {
4365         struct nfs_server *server = NFS_SERVER(state->inode);
4366         struct nfs4_exception exception = { };
4367         int err;
4368
4369         err = nfs4_set_lock_state(state, fl);
4370         if (err != 0)
4371                 goto out;
4372         do {
4373                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4374                 switch (err) {
4375                         default:
4376                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4377                                                 __func__, err);
4378                         case 0:
4379                         case -ESTALE:
4380                                 goto out;
4381                         case -NFS4ERR_EXPIRED:
4382                         case -NFS4ERR_STALE_CLIENTID:
4383                         case -NFS4ERR_STALE_STATEID:
4384                         case -NFS4ERR_BADSESSION:
4385                         case -NFS4ERR_BADSLOT:
4386                         case -NFS4ERR_BAD_HIGH_SLOT:
4387                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4388                         case -NFS4ERR_DEADSESSION:
4389                                 nfs4_schedule_state_recovery(server->nfs_client);
4390                                 goto out;
4391                         case -ERESTARTSYS:
4392                                 /*
4393                                  * The show must go on: exit, but mark the
4394                                  * stateid as needing recovery.
4395                                  */
4396                         case -NFS4ERR_ADMIN_REVOKED:
4397                         case -NFS4ERR_BAD_STATEID:
4398                         case -NFS4ERR_OPENMODE:
4399                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4400                                 err = 0;
4401                                 goto out;
4402                         case -ENOMEM:
4403                         case -NFS4ERR_DENIED:
4404                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4405                                 err = 0;
4406                                 goto out;
4407                         case -NFS4ERR_DELAY:
4408                         case -EKEYEXPIRED:
4409                                 break;
4410                 }
4411                 err = nfs4_handle_exception(server, err, &exception);
4412         } while (exception.retry);
4413 out:
4414         return err;
4415 }
4416
4417 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4418
4419 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4420                 size_t buflen, int flags)
4421 {
4422         struct inode *inode = dentry->d_inode;
4423
4424         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4425                 return -EOPNOTSUPP;
4426
4427         return nfs4_proc_set_acl(inode, buf, buflen);
4428 }
4429
4430 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4431  * and that's what we'll do for e.g. user attributes that haven't been set.
4432  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4433  * attributes in kernel-managed attribute namespaces. */
4434 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4435                 size_t buflen)
4436 {
4437         struct inode *inode = dentry->d_inode;
4438
4439         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4440                 return -EOPNOTSUPP;
4441
4442         return nfs4_proc_get_acl(inode, buf, buflen);
4443 }
4444
4445 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4446 {
4447         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4448
4449         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4450                 return 0;
4451         if (buf && buflen < len)
4452                 return -ERANGE;
4453         if (buf)
4454                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4455         return len;
4456 }
4457
4458 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4459 {
4460         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4461                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4462                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4463                 return;
4464
4465         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4466                 NFS_ATTR_FATTR_NLINK;
4467         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4468         fattr->nlink = 2;
4469 }
4470
4471 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4472                 struct nfs4_fs_locations *fs_locations, struct page *page)
4473 {
4474         struct nfs_server *server = NFS_SERVER(dir);
4475         u32 bitmask[2] = {
4476                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4477                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4478         };
4479         struct nfs4_fs_locations_arg args = {
4480                 .dir_fh = NFS_FH(dir),
4481                 .name = name,
4482                 .page = page,
4483                 .bitmask = bitmask,
4484         };
4485         struct nfs4_fs_locations_res res = {
4486                 .fs_locations = fs_locations,
4487         };
4488         struct rpc_message msg = {
4489                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4490                 .rpc_argp = &args,
4491                 .rpc_resp = &res,
4492         };
4493         int status;
4494
4495         dprintk("%s: start\n", __func__);
4496         nfs_fattr_init(&fs_locations->fattr);
4497         fs_locations->server = server;
4498         fs_locations->nlocations = 0;
4499         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4500         nfs_fixup_referral_attributes(&fs_locations->fattr);
4501         dprintk("%s: returned status = %d\n", __func__, status);
4502         return status;
4503 }
4504
4505 #ifdef CONFIG_NFS_V4_1
4506 /*
4507  * nfs4_proc_exchange_id()
4508  *
4509  * Since the clientid has expired, all compounds using sessions
4510  * associated with the stale clientid will be returning
4511  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4512  * be in some phase of session reset.
4513  */
4514 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4515 {
4516         nfs4_verifier verifier;
4517         struct nfs41_exchange_id_args args = {
4518                 .client = clp,
4519                 .flags = clp->cl_exchange_flags,
4520         };
4521         struct nfs41_exchange_id_res res = {
4522                 .client = clp,
4523         };
4524         int status;
4525         struct rpc_message msg = {
4526                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4527                 .rpc_argp = &args,
4528                 .rpc_resp = &res,
4529                 .rpc_cred = cred,
4530         };
4531         __be32 *p;
4532
4533         dprintk("--> %s\n", __func__);
4534         BUG_ON(clp == NULL);
4535
4536         /* Remove server-only flags */
4537         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4538
4539         p = (u32 *)verifier.data;
4540         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4541         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4542         args.verifier = &verifier;
4543
4544         while (1) {
4545                 args.id_len = scnprintf(args.id, sizeof(args.id),
4546                                         "%s/%s %u",
4547                                         clp->cl_ipaddr,
4548                                         rpc_peeraddr2str(clp->cl_rpcclient,
4549                                                          RPC_DISPLAY_ADDR),
4550                                         clp->cl_id_uniquifier);
4551
4552                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4553
4554                 if (status != -NFS4ERR_CLID_INUSE)
4555                         break;
4556
4557                 if (signalled())
4558                         break;
4559
4560                 if (++clp->cl_id_uniquifier == 0)
4561                         break;
4562         }
4563
4564         dprintk("<-- %s status= %d\n", __func__, status);
4565         return status;
4566 }
4567
4568 struct nfs4_get_lease_time_data {
4569         struct nfs4_get_lease_time_args *args;
4570         struct nfs4_get_lease_time_res *res;
4571         struct nfs_client *clp;
4572 };
4573
4574 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4575                                         void *calldata)
4576 {
4577         int ret;
4578         struct nfs4_get_lease_time_data *data =
4579                         (struct nfs4_get_lease_time_data *)calldata;
4580
4581         dprintk("--> %s\n", __func__);
4582         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4583         /* just setup sequence, do not trigger session recovery
4584            since we're invoked within one */
4585         ret = nfs41_setup_sequence(data->clp->cl_session,
4586                                    &data->args->la_seq_args,
4587                                    &data->res->lr_seq_res, 0, task);
4588
4589         BUG_ON(ret == -EAGAIN);
4590         rpc_call_start(task);
4591         dprintk("<-- %s\n", __func__);
4592 }
4593
4594 /*
4595  * Called from nfs4_state_manager thread for session setup, so don't recover
4596  * from sequence operation or clientid errors.
4597  */
4598 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4599 {
4600         struct nfs4_get_lease_time_data *data =
4601                         (struct nfs4_get_lease_time_data *)calldata;
4602
4603         dprintk("--> %s\n", __func__);
4604         nfs41_sequence_done(&data->res->lr_seq_res);
4605         switch (task->tk_status) {
4606         case -NFS4ERR_DELAY:
4607         case -NFS4ERR_GRACE:
4608         case -EKEYEXPIRED:
4609                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4610                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4611                 task->tk_status = 0;
4612                 nfs_restart_rpc(task, data->clp);
4613                 return;
4614         }
4615         dprintk("<-- %s\n", __func__);
4616 }
4617
4618 struct rpc_call_ops nfs4_get_lease_time_ops = {
4619         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4620         .rpc_call_done = nfs4_get_lease_time_done,
4621 };
4622
4623 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4624 {
4625         struct rpc_task *task;
4626         struct nfs4_get_lease_time_args args;
4627         struct nfs4_get_lease_time_res res = {
4628                 .lr_fsinfo = fsinfo,
4629         };
4630         struct nfs4_get_lease_time_data data = {
4631                 .args = &args,
4632                 .res = &res,
4633                 .clp = clp,
4634         };
4635         struct rpc_message msg = {
4636                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4637                 .rpc_argp = &args,
4638                 .rpc_resp = &res,
4639         };
4640         struct rpc_task_setup task_setup = {
4641                 .rpc_client = clp->cl_rpcclient,
4642                 .rpc_message = &msg,
4643                 .callback_ops = &nfs4_get_lease_time_ops,
4644                 .callback_data = &data
4645         };
4646         int status;
4647
4648         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4649         dprintk("--> %s\n", __func__);
4650         task = rpc_run_task(&task_setup);
4651
4652         if (IS_ERR(task))
4653                 status = PTR_ERR(task);
4654         else {
4655                 status = task->tk_status;
4656                 rpc_put_task(task);
4657         }
4658         dprintk("<-- %s return %d\n", __func__, status);
4659
4660         return status;
4661 }
4662
4663 /*
4664  * Reset a slot table
4665  */
4666 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4667                                  int ivalue)
4668 {
4669         struct nfs4_slot *new = NULL;
4670         int i;
4671         int ret = 0;
4672
4673         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4674                 max_reqs, tbl->max_slots);
4675
4676         /* Does the newly negotiated max_reqs match the existing slot table? */
4677         if (max_reqs != tbl->max_slots) {
4678                 ret = -ENOMEM;
4679                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4680                               GFP_NOFS);
4681                 if (!new)
4682                         goto out;
4683                 ret = 0;
4684                 kfree(tbl->slots);
4685         }
4686         spin_lock(&tbl->slot_tbl_lock);
4687         if (new) {
4688                 tbl->slots = new;
4689                 tbl->max_slots = max_reqs;
4690         }
4691         for (i = 0; i < tbl->max_slots; ++i)
4692                 tbl->slots[i].seq_nr = ivalue;
4693         spin_unlock(&tbl->slot_tbl_lock);
4694         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4695                 tbl, tbl->slots, tbl->max_slots);
4696 out:
4697         dprintk("<-- %s: return %d\n", __func__, ret);
4698         return ret;
4699 }
4700
4701 /*
4702  * Reset the forechannel and backchannel slot tables
4703  */
4704 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4705 {
4706         int status;
4707
4708         status = nfs4_reset_slot_table(&session->fc_slot_table,
4709                         session->fc_attrs.max_reqs, 1);
4710         if (status)
4711                 return status;
4712
4713         status = nfs4_reset_slot_table(&session->bc_slot_table,
4714                         session->bc_attrs.max_reqs, 0);
4715         return status;
4716 }
4717
4718 /* Destroy the slot table */
4719 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4720 {
4721         if (session->fc_slot_table.slots != NULL) {
4722                 kfree(session->fc_slot_table.slots);
4723                 session->fc_slot_table.slots = NULL;
4724         }
4725         if (session->bc_slot_table.slots != NULL) {
4726                 kfree(session->bc_slot_table.slots);
4727                 session->bc_slot_table.slots = NULL;
4728         }
4729         return;
4730 }
4731
4732 /*
4733  * Initialize slot table
4734  */
4735 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4736                 int max_slots, int ivalue)
4737 {
4738         struct nfs4_slot *slot;
4739         int ret = -ENOMEM;
4740
4741         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4742
4743         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4744
4745         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4746         if (!slot)
4747                 goto out;
4748         ret = 0;
4749
4750         spin_lock(&tbl->slot_tbl_lock);
4751         tbl->max_slots = max_slots;
4752         tbl->slots = slot;
4753         tbl->highest_used_slotid = -1;  /* no slot is currently used */
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  * Initialize the forechannel and backchannel tables
4764  */
4765 static int nfs4_init_slot_tables(struct nfs4_session *session)
4766 {
4767         struct nfs4_slot_table *tbl;
4768         int status = 0;
4769
4770         tbl = &session->fc_slot_table;
4771         if (tbl->slots == NULL) {
4772                 status = nfs4_init_slot_table(tbl,
4773                                 session->fc_attrs.max_reqs, 1);
4774                 if (status)
4775                         return status;
4776         }
4777
4778         tbl = &session->bc_slot_table;
4779         if (tbl->slots == NULL) {
4780                 status = nfs4_init_slot_table(tbl,
4781                                 session->bc_attrs.max_reqs, 0);
4782                 if (status)
4783                         nfs4_destroy_slot_tables(session);
4784         }
4785
4786         return status;
4787 }
4788
4789 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4790 {
4791         struct nfs4_session *session;
4792         struct nfs4_slot_table *tbl;
4793
4794         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4795         if (!session)
4796                 return NULL;
4797
4798         /*
4799          * The create session reply races with the server back
4800          * channel probe. Mark the client NFS_CS_SESSION_INITING
4801          * so that the client back channel can find the
4802          * nfs_client struct
4803          */
4804         clp->cl_cons_state = NFS_CS_SESSION_INITING;
4805         init_completion(&session->complete);
4806
4807         tbl = &session->fc_slot_table;
4808         tbl->highest_used_slotid = -1;
4809         spin_lock_init(&tbl->slot_tbl_lock);
4810         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4811
4812         tbl = &session->bc_slot_table;
4813         tbl->highest_used_slotid = -1;
4814         spin_lock_init(&tbl->slot_tbl_lock);
4815         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4816
4817         session->clp = clp;
4818         return session;
4819 }
4820
4821 void nfs4_destroy_session(struct nfs4_session *session)
4822 {
4823         nfs4_proc_destroy_session(session);
4824         dprintk("%s Destroy backchannel for xprt %p\n",
4825                 __func__, session->clp->cl_rpcclient->cl_xprt);
4826         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4827                                 NFS41_BC_MIN_CALLBACKS);
4828         nfs4_destroy_slot_tables(session);
4829         kfree(session);
4830 }
4831
4832 /*
4833  * Initialize the values to be used by the client in CREATE_SESSION
4834  * If nfs4_init_session set the fore channel request and response sizes,
4835  * use them.
4836  *
4837  * Set the back channel max_resp_sz_cached to zero to force the client to
4838  * always set csa_cachethis to FALSE because the current implementation
4839  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4840  */
4841 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4842 {
4843         struct nfs4_session *session = args->client->cl_session;
4844         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4845                      mxresp_sz = session->fc_attrs.max_resp_sz;
4846
4847         if (mxrqst_sz == 0)
4848                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4849         if (mxresp_sz == 0)
4850                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4851         /* Fore channel attributes */
4852         args->fc_attrs.headerpadsz = 0;
4853         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4854         args->fc_attrs.max_resp_sz = mxresp_sz;
4855         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4856         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4857
4858         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4859                 "max_ops=%u max_reqs=%u\n",
4860                 __func__,
4861                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4862                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4863
4864         /* Back channel attributes */
4865         args->bc_attrs.headerpadsz = 0;
4866         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4867         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4868         args->bc_attrs.max_resp_sz_cached = 0;
4869         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4870         args->bc_attrs.max_reqs = 1;
4871
4872         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4873                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4874                 __func__,
4875                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4876                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4877                 args->bc_attrs.max_reqs);
4878 }
4879
4880 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4881 {
4882         if (rcvd <= sent)
4883                 return 0;
4884         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4885                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4886         return -EINVAL;
4887 }
4888
4889 #define _verify_fore_channel_attr(_name_) \
4890         _verify_channel_attr("fore", #_name_, \
4891                              args->fc_attrs._name_, \
4892                              session->fc_attrs._name_)
4893
4894 #define _verify_back_channel_attr(_name_) \
4895         _verify_channel_attr("back", #_name_, \
4896                              args->bc_attrs._name_, \
4897                              session->bc_attrs._name_)
4898
4899 /*
4900  * The server is not allowed to increase the fore channel header pad size,
4901  * maximum response size, or maximum number of operations.
4902  *
4903  * The back channel attributes are only negotiatied down: We send what the
4904  * (back channel) server insists upon.
4905  */
4906 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4907                                      struct nfs4_session *session)
4908 {
4909         int ret = 0;
4910
4911         ret |= _verify_fore_channel_attr(headerpadsz);
4912         ret |= _verify_fore_channel_attr(max_resp_sz);
4913         ret |= _verify_fore_channel_attr(max_ops);
4914
4915         ret |= _verify_back_channel_attr(headerpadsz);
4916         ret |= _verify_back_channel_attr(max_rqst_sz);
4917         ret |= _verify_back_channel_attr(max_resp_sz);
4918         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4919         ret |= _verify_back_channel_attr(max_ops);
4920         ret |= _verify_back_channel_attr(max_reqs);
4921
4922         return ret;
4923 }
4924
4925 static int _nfs4_proc_create_session(struct nfs_client *clp)
4926 {
4927         struct nfs4_session *session = clp->cl_session;
4928         struct nfs41_create_session_args args = {
4929                 .client = clp,
4930                 .cb_program = NFS4_CALLBACK,
4931         };
4932         struct nfs41_create_session_res res = {
4933                 .client = clp,
4934         };
4935         struct rpc_message msg = {
4936                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4937                 .rpc_argp = &args,
4938                 .rpc_resp = &res,
4939         };
4940         int status;
4941
4942         nfs4_init_channel_attrs(&args);
4943         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4944
4945         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4946
4947         if (!status)
4948                 /* Verify the session's negotiated channel_attrs values */
4949                 status = nfs4_verify_channel_attrs(&args, session);
4950         if (!status) {
4951                 /* Increment the clientid slot sequence id */
4952                 clp->cl_seqid++;
4953         }
4954
4955         return status;
4956 }
4957
4958 /*
4959  * Issues a CREATE_SESSION operation to the server.
4960  * It is the responsibility of the caller to verify the session is
4961  * expired before calling this routine.
4962  */
4963 int nfs4_proc_create_session(struct nfs_client *clp)
4964 {
4965         int status;
4966         unsigned *ptr;
4967         struct nfs4_session *session = clp->cl_session;
4968
4969         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4970
4971         status = _nfs4_proc_create_session(clp);
4972         if (status)
4973                 goto out;
4974
4975         /* Init and reset the fore channel */
4976         status = nfs4_init_slot_tables(session);
4977         dprintk("slot table initialization returned %d\n", status);
4978         if (status)
4979                 goto out;
4980         status = nfs4_reset_slot_tables(session);
4981         dprintk("slot table reset returned %d\n", status);
4982         if (status)
4983                 goto out;
4984
4985         ptr = (unsigned *)&session->sess_id.data[0];
4986         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4987                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4988 out:
4989         dprintk("<-- %s\n", __func__);
4990         return status;
4991 }
4992
4993 /*
4994  * Issue the over-the-wire RPC DESTROY_SESSION.
4995  * The caller must serialize access to this routine.
4996  */
4997 int nfs4_proc_destroy_session(struct nfs4_session *session)
4998 {
4999         int status = 0;
5000         struct rpc_message msg;
5001
5002         dprintk("--> nfs4_proc_destroy_session\n");
5003
5004         /* session is still being setup */
5005         if (session->clp->cl_cons_state != NFS_CS_READY)
5006                 return status;
5007
5008         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5009         msg.rpc_argp = session;
5010         msg.rpc_resp = NULL;
5011         msg.rpc_cred = NULL;
5012         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5013
5014         if (status)
5015                 printk(KERN_WARNING
5016                         "Got error %d from the server on DESTROY_SESSION. "
5017                         "Session has been destroyed regardless...\n", status);
5018
5019         dprintk("<-- nfs4_proc_destroy_session\n");
5020         return status;
5021 }
5022
5023 int nfs4_init_session(struct nfs_server *server)
5024 {
5025         struct nfs_client *clp = server->nfs_client;
5026         struct nfs4_session *session;
5027         unsigned int rsize, wsize;
5028         int ret;
5029
5030         if (!nfs4_has_session(clp))
5031                 return 0;
5032
5033         rsize = server->rsize;
5034         if (rsize == 0)
5035                 rsize = NFS_MAX_FILE_IO_SIZE;
5036         wsize = server->wsize;
5037         if (wsize == 0)
5038                 wsize = NFS_MAX_FILE_IO_SIZE;
5039
5040         session = clp->cl_session;
5041         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5042         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5043
5044         ret = nfs4_recover_expired_lease(server);
5045         if (!ret)
5046                 ret = nfs4_check_client_ready(clp);
5047         return ret;
5048 }
5049
5050 /*
5051  * Renew the cl_session lease.
5052  */
5053 struct nfs4_sequence_data {
5054         struct nfs_client *clp;
5055         struct nfs4_sequence_args args;
5056         struct nfs4_sequence_res res;
5057 };
5058
5059 static void nfs41_sequence_release(void *data)
5060 {
5061         struct nfs4_sequence_data *calldata = data;
5062         struct nfs_client *clp = calldata->clp;
5063
5064         if (atomic_read(&clp->cl_count) > 1)
5065                 nfs4_schedule_state_renewal(clp);
5066         nfs_put_client(clp);
5067         kfree(calldata);
5068 }
5069
5070 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5071 {
5072         switch(task->tk_status) {
5073         case -NFS4ERR_DELAY:
5074         case -EKEYEXPIRED:
5075                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5076                 return -EAGAIN;
5077         default:
5078                 nfs4_schedule_state_recovery(clp);
5079         }
5080         return 0;
5081 }
5082
5083 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5084 {
5085         struct nfs4_sequence_data *calldata = data;
5086         struct nfs_client *clp = calldata->clp;
5087
5088         nfs41_sequence_done(task->tk_msg.rpc_resp);
5089
5090         if (task->tk_status < 0) {
5091                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5092                 if (atomic_read(&clp->cl_count) == 1)
5093                         goto out;
5094
5095                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5096                         rpc_restart_call_prepare(task);
5097                         return;
5098                 }
5099         }
5100         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5101 out:
5102         dprintk("<-- %s\n", __func__);
5103 }
5104
5105 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5106 {
5107         struct nfs4_sequence_data *calldata = data;
5108         struct nfs_client *clp = calldata->clp;
5109         struct nfs4_sequence_args *args;
5110         struct nfs4_sequence_res *res;
5111
5112         args = task->tk_msg.rpc_argp;
5113         res = task->tk_msg.rpc_resp;
5114
5115         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5116                 return;
5117         rpc_call_start(task);
5118 }
5119
5120 static const struct rpc_call_ops nfs41_sequence_ops = {
5121         .rpc_call_done = nfs41_sequence_call_done,
5122         .rpc_call_prepare = nfs41_sequence_prepare,
5123         .rpc_release = nfs41_sequence_release,
5124 };
5125
5126 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5127 {
5128         struct nfs4_sequence_data *calldata;
5129         struct rpc_message msg = {
5130                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5131                 .rpc_cred = cred,
5132         };
5133         struct rpc_task_setup task_setup_data = {
5134                 .rpc_client = clp->cl_rpcclient,
5135                 .rpc_message = &msg,
5136                 .callback_ops = &nfs41_sequence_ops,
5137                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5138         };
5139
5140         if (!atomic_inc_not_zero(&clp->cl_count))
5141                 return ERR_PTR(-EIO);
5142         calldata = kmalloc(sizeof(*calldata), GFP_NOFS);
5143         if (calldata == NULL) {
5144                 nfs_put_client(clp);
5145                 return ERR_PTR(-ENOMEM);
5146         }
5147         calldata->res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5148         msg.rpc_argp = &calldata->args;
5149         msg.rpc_resp = &calldata->res;
5150         calldata->clp = clp;
5151         task_setup_data.callback_data = calldata;
5152
5153         return rpc_run_task(&task_setup_data);
5154 }
5155
5156 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5157 {
5158         struct rpc_task *task;
5159         int ret = 0;
5160
5161         task = _nfs41_proc_sequence(clp, cred);
5162         if (IS_ERR(task))
5163                 ret = PTR_ERR(task);
5164         else
5165                 rpc_put_task(task);
5166         dprintk("<-- %s status=%d\n", __func__, ret);
5167         return ret;
5168 }
5169
5170 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5171 {
5172         struct rpc_task *task;
5173         int ret;
5174
5175         task = _nfs41_proc_sequence(clp, cred);
5176         if (IS_ERR(task)) {
5177                 ret = PTR_ERR(task);
5178                 goto out;
5179         }
5180         ret = rpc_wait_for_completion_task(task);
5181         if (!ret)
5182                 ret = task->tk_status;
5183         rpc_put_task(task);
5184 out:
5185         dprintk("<-- %s status=%d\n", __func__, ret);
5186         return ret;
5187 }
5188
5189 struct nfs4_reclaim_complete_data {
5190         struct nfs_client *clp;
5191         struct nfs41_reclaim_complete_args arg;
5192         struct nfs41_reclaim_complete_res res;
5193 };
5194
5195 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5196 {
5197         struct nfs4_reclaim_complete_data *calldata = data;
5198
5199         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5200         if (nfs41_setup_sequence(calldata->clp->cl_session,
5201                                 &calldata->arg.seq_args,
5202                                 &calldata->res.seq_res, 0, task))
5203                 return;
5204
5205         rpc_call_start(task);
5206 }
5207
5208 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5209 {
5210         switch(task->tk_status) {
5211         case 0:
5212         case -NFS4ERR_COMPLETE_ALREADY:
5213         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5214                 break;
5215         case -NFS4ERR_DELAY:
5216         case -EKEYEXPIRED:
5217                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5218                 return -EAGAIN;
5219         default:
5220                 nfs4_schedule_state_recovery(clp);
5221         }
5222         return 0;
5223 }
5224
5225 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5226 {
5227         struct nfs4_reclaim_complete_data *calldata = data;
5228         struct nfs_client *clp = calldata->clp;
5229         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5230
5231         dprintk("--> %s\n", __func__);
5232         nfs41_sequence_done(res);
5233
5234         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5235                 rpc_restart_call_prepare(task);
5236                 return;
5237         }
5238         dprintk("<-- %s\n", __func__);
5239 }
5240
5241 static void nfs4_free_reclaim_complete_data(void *data)
5242 {
5243         struct nfs4_reclaim_complete_data *calldata = data;
5244
5245         kfree(calldata);
5246 }
5247
5248 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5249         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5250         .rpc_call_done = nfs4_reclaim_complete_done,
5251         .rpc_release = nfs4_free_reclaim_complete_data,
5252 };
5253
5254 /*
5255  * Issue a global reclaim complete.
5256  */
5257 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5258 {
5259         struct nfs4_reclaim_complete_data *calldata;
5260         struct rpc_task *task;
5261         struct rpc_message msg = {
5262                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5263         };
5264         struct rpc_task_setup task_setup_data = {
5265                 .rpc_client = clp->cl_rpcclient,
5266                 .rpc_message = &msg,
5267                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5268                 .flags = RPC_TASK_ASYNC,
5269         };
5270         int status = -ENOMEM;
5271
5272         dprintk("--> %s\n", __func__);
5273         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5274         if (calldata == NULL)
5275                 goto out;
5276         calldata->clp = clp;
5277         calldata->arg.one_fs = 0;
5278         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5279
5280         msg.rpc_argp = &calldata->arg;
5281         msg.rpc_resp = &calldata->res;
5282         task_setup_data.callback_data = calldata;
5283         task = rpc_run_task(&task_setup_data);
5284         if (IS_ERR(task)) {
5285                 status = PTR_ERR(task);
5286                 goto out;
5287         }
5288         rpc_put_task(task);
5289         return 0;
5290 out:
5291         dprintk("<-- %s status=%d\n", __func__, status);
5292         return status;
5293 }
5294 #endif /* CONFIG_NFS_V4_1 */
5295
5296 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5297         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5298         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5299         .recover_open   = nfs4_open_reclaim,
5300         .recover_lock   = nfs4_lock_reclaim,
5301         .establish_clid = nfs4_init_clientid,
5302         .get_clid_cred  = nfs4_get_setclientid_cred,
5303 };
5304
5305 #if defined(CONFIG_NFS_V4_1)
5306 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5307         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5308         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5309         .recover_open   = nfs4_open_reclaim,
5310         .recover_lock   = nfs4_lock_reclaim,
5311         .establish_clid = nfs41_init_clientid,
5312         .get_clid_cred  = nfs4_get_exchange_id_cred,
5313         .reclaim_complete = nfs41_proc_reclaim_complete,
5314 };
5315 #endif /* CONFIG_NFS_V4_1 */
5316
5317 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5318         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5319         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5320         .recover_open   = nfs4_open_expired,
5321         .recover_lock   = nfs4_lock_expired,
5322         .establish_clid = nfs4_init_clientid,
5323         .get_clid_cred  = nfs4_get_setclientid_cred,
5324 };
5325
5326 #if defined(CONFIG_NFS_V4_1)
5327 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5328         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5329         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5330         .recover_open   = nfs4_open_expired,
5331         .recover_lock   = nfs4_lock_expired,
5332         .establish_clid = nfs41_init_clientid,
5333         .get_clid_cred  = nfs4_get_exchange_id_cred,
5334 };
5335 #endif /* CONFIG_NFS_V4_1 */
5336
5337 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5338         .sched_state_renewal = nfs4_proc_async_renew,
5339         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5340         .renew_lease = nfs4_proc_renew,
5341 };
5342
5343 #if defined(CONFIG_NFS_V4_1)
5344 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5345         .sched_state_renewal = nfs41_proc_async_sequence,
5346         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5347         .renew_lease = nfs4_proc_sequence,
5348 };
5349 #endif
5350
5351 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5352         .minor_version = 0,
5353         .call_sync = _nfs4_call_sync,
5354         .validate_stateid = nfs4_validate_delegation_stateid,
5355         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5356         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5357         .state_renewal_ops = &nfs40_state_renewal_ops,
5358 };
5359
5360 #if defined(CONFIG_NFS_V4_1)
5361 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5362         .minor_version = 1,
5363         .call_sync = _nfs4_call_sync_session,
5364         .validate_stateid = nfs41_validate_delegation_stateid,
5365         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5366         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5367         .state_renewal_ops = &nfs41_state_renewal_ops,
5368 };
5369 #endif
5370
5371 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5372         [0] = &nfs_v4_0_minor_ops,
5373 #if defined(CONFIG_NFS_V4_1)
5374         [1] = &nfs_v4_1_minor_ops,
5375 #endif
5376 };
5377
5378 static const struct inode_operations nfs4_file_inode_operations = {
5379         .permission     = nfs_permission,
5380         .getattr        = nfs_getattr,
5381         .setattr        = nfs_setattr,
5382         .getxattr       = nfs4_getxattr,
5383         .setxattr       = nfs4_setxattr,
5384         .listxattr      = nfs4_listxattr,
5385 };
5386
5387 const struct nfs_rpc_ops nfs_v4_clientops = {
5388         .version        = 4,                    /* protocol version */
5389         .dentry_ops     = &nfs4_dentry_operations,
5390         .dir_inode_ops  = &nfs4_dir_inode_operations,
5391         .file_inode_ops = &nfs4_file_inode_operations,
5392         .getroot        = nfs4_proc_get_root,
5393         .getattr        = nfs4_proc_getattr,
5394         .setattr        = nfs4_proc_setattr,
5395         .lookupfh       = nfs4_proc_lookupfh,
5396         .lookup         = nfs4_proc_lookup,
5397         .access         = nfs4_proc_access,
5398         .readlink       = nfs4_proc_readlink,
5399         .create         = nfs4_proc_create,
5400         .remove         = nfs4_proc_remove,
5401         .unlink_setup   = nfs4_proc_unlink_setup,
5402         .unlink_done    = nfs4_proc_unlink_done,
5403         .rename         = nfs4_proc_rename,
5404         .link           = nfs4_proc_link,
5405         .symlink        = nfs4_proc_symlink,
5406         .mkdir          = nfs4_proc_mkdir,
5407         .rmdir          = nfs4_proc_remove,
5408         .readdir        = nfs4_proc_readdir,
5409         .mknod          = nfs4_proc_mknod,
5410         .statfs         = nfs4_proc_statfs,
5411         .fsinfo         = nfs4_proc_fsinfo,
5412         .pathconf       = nfs4_proc_pathconf,
5413         .set_capabilities = nfs4_server_capabilities,
5414         .decode_dirent  = nfs4_decode_dirent,
5415         .read_setup     = nfs4_proc_read_setup,
5416         .read_done      = nfs4_read_done,
5417         .write_setup    = nfs4_proc_write_setup,
5418         .write_done     = nfs4_write_done,
5419         .commit_setup   = nfs4_proc_commit_setup,
5420         .commit_done    = nfs4_commit_done,
5421         .lock           = nfs4_proc_lock,
5422         .clear_acl_cache = nfs4_zap_acl_attr,
5423         .close_context  = nfs4_close_context,
5424 };
5425
5426 /*
5427  * Local variables:
5428  *  c-basic-offset: 8
5429  * End:
5430  */