fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/namei.h>
  49 #include <linux/mount.h>
  50 #include <linux/module.h>
  51 #include <linux/sunrpc/bc_xprt.h>
  52 #include <linux/xattr.h>
  53
  54 #include "nfs4_fs.h"
  55 #include "delegation.h"
  56 #include "internal.h"
  57 #include "iostat.h"
  58 #include "callback.h"
  59 #include "pnfs.h"
  60
  61 #define NFSDBG_FACILITY         NFSDBG_PROC
  62
  63 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  64 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  65
  66 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  67
  68 struct nfs4_opendata;
  69 static int _nfs4_proc_open(struct nfs4_opendata *data);
  70 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  71 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  72 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  73 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  74 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  75 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  76                             struct nfs_fattr *fattr, struct iattr *sattr,
  77                             struct nfs4_state *state);
  78
  79 /* Prevent leaks of NFSv4 errors into userland */
  80 static int nfs4_map_errors(int err)
  81 {
  82         if (err >= -1000)
  83                 return err;
  84         switch (err) {
  85         case -NFS4ERR_RESOURCE:
  86                 return -EREMOTEIO;
  87         default:
  88                 dprintk("%s could not handle NFSv4 error %d\n",
  89                                 __func__, -err);
  90                 break;
  91         }
  92         return -EIO;
  93 }
  94
  95 /*
  96  * This is our standard bitmap for GETATTR requests.
  97  */
  98 const u32 nfs4_fattr_bitmap[2] = {
  99         FATTR4_WORD0_TYPE
 100         | FATTR4_WORD0_CHANGE
 101         | FATTR4_WORD0_SIZE
 102         | FATTR4_WORD0_FSID
 103         | FATTR4_WORD0_FILEID,
 104         FATTR4_WORD1_MODE
 105         | FATTR4_WORD1_NUMLINKS
 106         | FATTR4_WORD1_OWNER
 107         | FATTR4_WORD1_OWNER_GROUP
 108         | FATTR4_WORD1_RAWDEV
 109         | FATTR4_WORD1_SPACE_USED
 110         | FATTR4_WORD1_TIME_ACCESS
 111         | FATTR4_WORD1_TIME_METADATA
 112         | FATTR4_WORD1_TIME_MODIFY
 113 };
 114
 115 const u32 nfs4_statfs_bitmap[2] = {
 116         FATTR4_WORD0_FILES_AVAIL
 117         | FATTR4_WORD0_FILES_FREE
 118         | FATTR4_WORD0_FILES_TOTAL,
 119         FATTR4_WORD1_SPACE_AVAIL
 120         | FATTR4_WORD1_SPACE_FREE
 121         | FATTR4_WORD1_SPACE_TOTAL
 122 };
 123
 124 const u32 nfs4_pathconf_bitmap[2] = {
 125         FATTR4_WORD0_MAXLINK
 126         | FATTR4_WORD0_MAXNAME,
 127         0
 128 };
 129
 130 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 131                         | FATTR4_WORD0_MAXREAD
 132                         | FATTR4_WORD0_MAXWRITE
 133                         | FATTR4_WORD0_LEASE_TIME,
 134                         FATTR4_WORD1_TIME_DELTA
 135                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 136 };
 137
 138 const u32 nfs4_fs_locations_bitmap[2] = {
 139         FATTR4_WORD0_TYPE
 140         | FATTR4_WORD0_CHANGE
 141         | FATTR4_WORD0_SIZE
 142         | FATTR4_WORD0_FSID
 143         | FATTR4_WORD0_FILEID
 144         | FATTR4_WORD0_FS_LOCATIONS,
 145         FATTR4_WORD1_MODE
 146         | FATTR4_WORD1_NUMLINKS
 147         | FATTR4_WORD1_OWNER
 148         | FATTR4_WORD1_OWNER_GROUP
 149         | FATTR4_WORD1_RAWDEV
 150         | FATTR4_WORD1_SPACE_USED
 151         | FATTR4_WORD1_TIME_ACCESS
 152         | FATTR4_WORD1_TIME_METADATA
 153         | FATTR4_WORD1_TIME_MODIFY
 154         | FATTR4_WORD1_MOUNTED_ON_FILEID
 155 };
 156
 157 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 158                 struct nfs4_readdir_arg *readdir)
 159 {
 160         __be32 *start, *p;
 161
 162         BUG_ON(readdir->count < 80);
 163         if (cookie > 2) {
 164                 readdir->cookie = cookie;
 165                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 166                 return;
 167         }
 168
 169         readdir->cookie = 0;
 170         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 171         if (cookie == 2)
 172                 return;
 173
 174         /*
 175          * NFSv4 servers do not return entries for '.' and '..'
 176          * Therefore, we fake these entries here.  We let '.'
 177          * have cookie 0 and '..' have cookie 1.  Note that
 178          * when talking to the server, we always send cookie 0
 179          * instead of 1 or 2.
 180          */
 181         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 182
 183         if (cookie == 0) {
 184                 *p++ = xdr_one;                                  /* next */
 185                 *p++ = xdr_zero;                   /* cookie, first word */
 186                 *p++ = xdr_one;                   /* cookie, second word */
 187                 *p++ = xdr_one;                             /* entry len */
 188                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 189                 p++;
 190                 *p++ = xdr_one;                         /* bitmap length */
 191                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 192                 *p++ = htonl(8);              /* attribute buffer length */
 193                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 194         }
 195
 196         *p++ = xdr_one;                                  /* next */
 197         *p++ = xdr_zero;                   /* cookie, first word */
 198         *p++ = xdr_two;                   /* cookie, second word */
 199         *p++ = xdr_two;                             /* entry len */
 200         memcpy(p, "..\0\0", 4);                         /* entry */
 201         p++;
 202         *p++ = xdr_one;                         /* bitmap length */
 203         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 204         *p++ = htonl(8);              /* attribute buffer length */
 205         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 206
 207         readdir->pgbase = (char *)p - (char *)start;
 208         readdir->count -= readdir->pgbase;
 209         kunmap_atomic(start, KM_USER0);
 210 }
 211
 212 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 213 {
 214         int res;
 215
 216         might_sleep();
 217
 218         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 219                         nfs_wait_bit_killable, TASK_KILLABLE);
 220         return res;
 221 }
 222
 223 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 224 {
 225         int res = 0;
 226
 227         might_sleep();
 228
 229         if (*timeout <= 0)
 230                 *timeout = NFS4_POLL_RETRY_MIN;
 231         if (*timeout > NFS4_POLL_RETRY_MAX)
 232                 *timeout = NFS4_POLL_RETRY_MAX;
 233         schedule_timeout_killable(*timeout);
 234         if (fatal_signal_pending(current))
 235                 res = -ERESTARTSYS;
 236         *timeout <<= 1;
 237         return res;
 238 }
 239
 240 /* This is the error handling routine for processes that are allowed
 241  * to sleep.
 242  */
 243 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 244 {
 245         struct nfs_client *clp = server->nfs_client;
 246         struct nfs4_state *state = exception->state;
 247         int ret = errorcode;
 248
 249         exception->retry = 0;
 250         switch(errorcode) {
 251                 case 0:
 252                         return 0;
 253                 case -NFS4ERR_ADMIN_REVOKED:
 254                 case -NFS4ERR_BAD_STATEID:
 255                 case -NFS4ERR_OPENMODE:
 256                         if (state == NULL)
 257                                 break;
 258                         nfs4_state_mark_reclaim_nograce(clp, state);
 259                         goto do_state_recovery;
 260                 case -NFS4ERR_STALE_STATEID:
 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 do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 307 {
 308         spin_lock(&clp->cl_lock);
 309         if (time_before(clp->cl_last_renewal,timestamp))
 310                 clp->cl_last_renewal = timestamp;
 311         spin_unlock(&clp->cl_lock);
 312 }
 313
 314 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 315 {
 316         do_renew_lease(server->nfs_client, timestamp);
 317 }
 318
 319 #if defined(CONFIG_NFS_V4_1)
 320
 321 /*
 322  * nfs4_free_slot - free a slot and efficiently update slot table.
 323  *
 324  * freeing a slot is trivially done by clearing its respective bit
 325  * in the bitmap.
 326  * If the freed slotid equals highest_used_slotid we want to update it
 327  * so that the server would be able to size down the slot table if needed,
 328  * otherwise we know that the highest_used_slotid is still in use.
 329  * When updating highest_used_slotid there may be "holes" in the bitmap
 330  * so we need to scan down from highest_used_slotid to 0 looking for the now
 331  * highest slotid in use.
 332  * If none found, highest_used_slotid is set to -1.
 333  *
 334  * Must be called while holding tbl->slot_tbl_lock
 335  */
 336 static void
 337 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 338 {
 339         int free_slotid = free_slot - tbl->slots;
 340         int slotid = free_slotid;
 341
 342         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 343         /* clear used bit in bitmap */
 344         __clear_bit(slotid, tbl->used_slots);
 345
 346         /* update highest_used_slotid when it is freed */
 347         if (slotid == tbl->highest_used_slotid) {
 348                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 349                 if (slotid < tbl->max_slots)
 350                         tbl->highest_used_slotid = slotid;
 351                 else
 352                         tbl->highest_used_slotid = -1;
 353         }
 354         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 355                 free_slotid, tbl->highest_used_slotid);
 356 }
 357
 358 /*
 359  * Signal state manager thread if session fore channel is drained
 360  */
 361 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 362 {
 363         struct rpc_task *task;
 364
 365         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 366                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 367                 if (task)
 368                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 369                 return;
 370         }
 371
 372         if (ses->fc_slot_table.highest_used_slotid != -1)
 373                 return;
 374
 375         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 376         complete(&ses->fc_slot_table.complete);
 377 }
 378
 379 /*
 380  * Signal state manager thread if session back channel is drained
 381  */
 382 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 383 {
 384         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 385             ses->bc_slot_table.highest_used_slotid != -1)
 386                 return;
 387         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 388         complete(&ses->bc_slot_table.complete);
 389 }
 390
 391 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 392 {
 393         struct nfs4_slot_table *tbl;
 394
 395         tbl = &res->sr_session->fc_slot_table;
 396         if (!res->sr_slot) {
 397                 /* just wake up the next guy waiting since
 398                  * we may have not consumed a slot after all */
 399                 dprintk("%s: No slot\n", __func__);
 400                 return;
 401         }
 402
 403         spin_lock(&tbl->slot_tbl_lock);
 404         nfs4_free_slot(tbl, res->sr_slot);
 405         nfs4_check_drain_fc_complete(res->sr_session);
 406         spin_unlock(&tbl->slot_tbl_lock);
 407         res->sr_slot = NULL;
 408 }
 409
 410 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 411 {
 412         unsigned long timestamp;
 413         struct nfs_client *clp;
 414
 415         /*
 416          * sr_status remains 1 if an RPC level error occurred. The server
 417          * may or may not have processed the sequence operation..
 418          * Proceed as if the server received and processed the sequence
 419          * operation.
 420          */
 421         if (res->sr_status == 1)
 422                 res->sr_status = NFS_OK;
 423
 424         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 425         if (!res->sr_slot)
 426                 goto out;
 427
 428         /* Check the SEQUENCE operation status */
 429         switch (res->sr_status) {
 430         case 0:
 431                 /* Update the slot's sequence and clientid lease timer */
 432                 ++res->sr_slot->seq_nr;
 433                 timestamp = res->sr_renewal_time;
 434                 clp = res->sr_session->clp;
 435                 do_renew_lease(clp, timestamp);
 436                 /* Check sequence flags */
 437                 if (atomic_read(&clp->cl_count) > 1)
 438                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 439                 break;
 440         case -NFS4ERR_DELAY:
 441                 /* The server detected a resend of the RPC call and
 442                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 443                  * of RFC5661.
 444                  */
 445                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 446                         __func__,
 447                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 448                         res->sr_slot->seq_nr);
 449                 goto out_retry;
 450         default:
 451                 /* Just update the slot sequence no. */
 452                 ++res->sr_slot->seq_nr;
 453         }
 454 out:
 455         /* The session may be reset by one of the error handlers. */
 456         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 457         nfs41_sequence_free_slot(res);
 458         return 1;
 459 out_retry:
 460         if (!rpc_restart_call(task))
 461                 goto out;
 462         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 463         return 0;
 464 }
 465
 466 static int nfs4_sequence_done(struct rpc_task *task,
 467                                struct nfs4_sequence_res *res)
 468 {
 469         if (res->sr_session == NULL)
 470                 return 1;
 471         return nfs41_sequence_done(task, res);
 472 }
 473
 474 /*
 475  * nfs4_find_slot - efficiently look for a free slot
 476  *
 477  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 478  * If found, we mark the slot as used, update the highest_used_slotid,
 479  * and respectively set up the sequence operation args.
 480  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 481  *
 482  * Note: must be called with under the slot_tbl_lock.
 483  */
 484 static u8
 485 nfs4_find_slot(struct nfs4_slot_table *tbl)
 486 {
 487         int slotid;
 488         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 489         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 490
 491         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 492                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 493                 tbl->max_slots);
 494         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 495         if (slotid >= tbl->max_slots)
 496                 goto out;
 497         __set_bit(slotid, tbl->used_slots);
 498         if (slotid > tbl->highest_used_slotid)
 499                 tbl->highest_used_slotid = slotid;
 500         ret_id = slotid;
 501 out:
 502         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 503                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 504         return ret_id;
 505 }
 506
 507 static int nfs41_setup_sequence(struct nfs4_session *session,
 508                                 struct nfs4_sequence_args *args,
 509                                 struct nfs4_sequence_res *res,
 510                                 int cache_reply,
 511                                 struct rpc_task *task)
 512 {
 513         struct nfs4_slot *slot;
 514         struct nfs4_slot_table *tbl;
 515         u8 slotid;
 516
 517         dprintk("--> %s\n", __func__);
 518         /* slot already allocated? */
 519         if (res->sr_slot != NULL)
 520                 return 0;
 521
 522         tbl = &session->fc_slot_table;
 523
 524         spin_lock(&tbl->slot_tbl_lock);
 525         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 526             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 527                 /*
 528                  * The state manager will wait until the slot table is empty.
 529                  * Schedule the reset thread
 530                  */
 531                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 532                 spin_unlock(&tbl->slot_tbl_lock);
 533                 dprintk("%s Schedule Session Reset\n", __func__);
 534                 return -EAGAIN;
 535         }
 536
 537         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 538             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 539                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 540                 spin_unlock(&tbl->slot_tbl_lock);
 541                 dprintk("%s enforce FIFO order\n", __func__);
 542                 return -EAGAIN;
 543         }
 544
 545         slotid = nfs4_find_slot(tbl);
 546         if (slotid == NFS4_MAX_SLOT_TABLE) {
 547                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 548                 spin_unlock(&tbl->slot_tbl_lock);
 549                 dprintk("<-- %s: no free slots\n", __func__);
 550                 return -EAGAIN;
 551         }
 552         spin_unlock(&tbl->slot_tbl_lock);
 553
 554         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 555         slot = tbl->slots + slotid;
 556         args->sa_session = session;
 557         args->sa_slotid = slotid;
 558         args->sa_cache_this = cache_reply;
 559
 560         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 561
 562         res->sr_session = session;
 563         res->sr_slot = slot;
 564         res->sr_renewal_time = jiffies;
 565         res->sr_status_flags = 0;
 566         /*
 567          * sr_status is only set in decode_sequence, and so will remain
 568          * set to 1 if an rpc level failure occurs.
 569          */
 570         res->sr_status = 1;
 571         return 0;
 572 }
 573
 574 int nfs4_setup_sequence(const struct nfs_server *server,
 575                         struct nfs4_sequence_args *args,
 576                         struct nfs4_sequence_res *res,
 577                         int cache_reply,
 578                         struct rpc_task *task)
 579 {
 580         struct nfs4_session *session = nfs4_get_session(server);
 581         int ret = 0;
 582
 583         if (session == NULL) {
 584                 args->sa_session = NULL;
 585                 res->sr_session = NULL;
 586                 goto out;
 587         }
 588
 589         dprintk("--> %s clp %p session %p sr_slot %td\n",
 590                 __func__, session->clp, session, res->sr_slot ?
 591                         res->sr_slot - session->fc_slot_table.slots : -1);
 592
 593         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 594                                    task);
 595 out:
 596         dprintk("<-- %s status=%d\n", __func__, ret);
 597         return ret;
 598 }
 599
 600 struct nfs41_call_sync_data {
 601         const struct nfs_server *seq_server;
 602         struct nfs4_sequence_args *seq_args;
 603         struct nfs4_sequence_res *seq_res;
 604         int cache_reply;
 605 };
 606
 607 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 608 {
 609         struct nfs41_call_sync_data *data = calldata;
 610
 611         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 612
 613         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 614                                 data->seq_res, data->cache_reply, task))
 615                 return;
 616         rpc_call_start(task);
 617 }
 618
 619 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 620 {
 621         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 622         nfs41_call_sync_prepare(task, calldata);
 623 }
 624
 625 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 626 {
 627         struct nfs41_call_sync_data *data = calldata;
 628
 629         nfs41_sequence_done(task, data->seq_res);
 630 }
 631
 632 struct rpc_call_ops nfs41_call_sync_ops = {
 633         .rpc_call_prepare = nfs41_call_sync_prepare,
 634         .rpc_call_done = nfs41_call_sync_done,
 635 };
 636
 637 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 638         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 639         .rpc_call_done = nfs41_call_sync_done,
 640 };
 641
 642 static int nfs4_call_sync_sequence(struct nfs_server *server,
 643                                    struct rpc_message *msg,
 644                                    struct nfs4_sequence_args *args,
 645                                    struct nfs4_sequence_res *res,
 646                                    int cache_reply,
 647                                    int privileged)
 648 {
 649         int ret;
 650         struct rpc_task *task;
 651         struct nfs41_call_sync_data data = {
 652                 .seq_server = server,
 653                 .seq_args = args,
 654                 .seq_res = res,
 655                 .cache_reply = cache_reply,
 656         };
 657         struct rpc_task_setup task_setup = {
 658                 .rpc_client = server->client,
 659                 .rpc_message = msg,
 660                 .callback_ops = &nfs41_call_sync_ops,
 661                 .callback_data = &data
 662         };
 663
 664         res->sr_slot = NULL;
 665         if (privileged)
 666                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 667         task = rpc_run_task(&task_setup);
 668         if (IS_ERR(task))
 669                 ret = PTR_ERR(task);
 670         else {
 671                 ret = task->tk_status;
 672                 rpc_put_task(task);
 673         }
 674         return ret;
 675 }
 676
 677 int _nfs4_call_sync_session(struct nfs_server *server,
 678                             struct rpc_message *msg,
 679                             struct nfs4_sequence_args *args,
 680                             struct nfs4_sequence_res *res,
 681                             int cache_reply)
 682 {
 683         return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
 684 }
 685
 686 #else
 687 static int nfs4_sequence_done(struct rpc_task *task,
 688                                struct nfs4_sequence_res *res)
 689 {
 690         return 1;
 691 }
 692 #endif /* CONFIG_NFS_V4_1 */
 693
 694 int _nfs4_call_sync(struct nfs_server *server,
 695                     struct rpc_message *msg,
 696                     struct nfs4_sequence_args *args,
 697                     struct nfs4_sequence_res *res,
 698                     int cache_reply)
 699 {
 700         args->sa_session = res->sr_session = NULL;
 701         return rpc_call_sync(server->client, msg, 0);
 702 }
 703
 704 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 705         (server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
 706                         &(res)->seq_res, (cache_reply))
 707
 708 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 709 {
 710         struct nfs_inode *nfsi = NFS_I(dir);
 711
 712         spin_lock(&dir->i_lock);
 713         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 714         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 715                 nfs_force_lookup_revalidate(dir);
 716         nfsi->change_attr = cinfo->after;
 717         spin_unlock(&dir->i_lock);
 718 }
 719
 720 struct nfs4_opendata {
 721         struct kref kref;
 722         struct nfs_openargs o_arg;
 723         struct nfs_openres o_res;
 724         struct nfs_open_confirmargs c_arg;
 725         struct nfs_open_confirmres c_res;
 726         struct nfs_fattr f_attr;
 727         struct nfs_fattr dir_attr;
 728         struct path path;
 729         struct dentry *dir;
 730         struct nfs4_state_owner *owner;
 731         struct nfs4_state *state;
 732         struct iattr attrs;
 733         unsigned long timestamp;
 734         unsigned int rpc_done : 1;
 735         int rpc_status;
 736         int cancelled;
 737 };
 738
 739
 740 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 741 {
 742         p->o_res.f_attr = &p->f_attr;
 743         p->o_res.dir_attr = &p->dir_attr;
 744         p->o_res.seqid = p->o_arg.seqid;
 745         p->c_res.seqid = p->c_arg.seqid;
 746         p->o_res.server = p->o_arg.server;
 747         nfs_fattr_init(&p->f_attr);
 748         nfs_fattr_init(&p->dir_attr);
 749 }
 750
 751 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 752                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 753                 const struct iattr *attrs,
 754                 gfp_t gfp_mask)
 755 {
 756         struct dentry *parent = dget_parent(path->dentry);
 757         struct inode *dir = parent->d_inode;
 758         struct nfs_server *server = NFS_SERVER(dir);
 759         struct nfs4_opendata *p;
 760
 761         p = kzalloc(sizeof(*p), gfp_mask);
 762         if (p == NULL)
 763                 goto err;
 764         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 765         if (p->o_arg.seqid == NULL)
 766                 goto err_free;
 767         path_get(path);
 768         p->path = *path;
 769         p->dir = parent;
 770         p->owner = sp;
 771         atomic_inc(&sp->so_count);
 772         p->o_arg.fh = NFS_FH(dir);
 773         p->o_arg.open_flags = flags;
 774         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 775         p->o_arg.clientid = server->nfs_client->cl_clientid;
 776         p->o_arg.id = sp->so_owner_id.id;
 777         p->o_arg.name = &p->path.dentry->d_name;
 778         p->o_arg.server = server;
 779         p->o_arg.bitmask = server->attr_bitmask;
 780         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 781         if (flags & O_CREAT) {
 782                 u32 *s;
 783
 784                 p->o_arg.u.attrs = &p->attrs;
 785                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 786                 s = (u32 *) p->o_arg.u.verifier.data;
 787                 s[0] = jiffies;
 788                 s[1] = current->pid;
 789         }
 790         p->c_arg.fh = &p->o_res.fh;
 791         p->c_arg.stateid = &p->o_res.stateid;
 792         p->c_arg.seqid = p->o_arg.seqid;
 793         nfs4_init_opendata_res(p);
 794         kref_init(&p->kref);
 795         return p;
 796 err_free:
 797         kfree(p);
 798 err:
 799         dput(parent);
 800         return NULL;
 801 }
 802
 803 static void nfs4_opendata_free(struct kref *kref)
 804 {
 805         struct nfs4_opendata *p = container_of(kref,
 806                         struct nfs4_opendata, kref);
 807
 808         nfs_free_seqid(p->o_arg.seqid);
 809         if (p->state != NULL)
 810                 nfs4_put_open_state(p->state);
 811         nfs4_put_state_owner(p->owner);
 812         dput(p->dir);
 813         path_put(&p->path);
 814         kfree(p);
 815 }
 816
 817 static void nfs4_opendata_put(struct nfs4_opendata *p)
 818 {
 819         if (p != NULL)
 820                 kref_put(&p->kref, nfs4_opendata_free);
 821 }
 822
 823 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 824 {
 825         int ret;
 826
 827         ret = rpc_wait_for_completion_task(task);
 828         return ret;
 829 }
 830
 831 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 832 {
 833         int ret = 0;
 834
 835         if (open_mode & O_EXCL)
 836                 goto out;
 837         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 838                 case FMODE_READ:
 839                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 840                                 && state->n_rdonly != 0;
 841                         break;
 842                 case FMODE_WRITE:
 843                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 844                                 && state->n_wronly != 0;
 845                         break;
 846                 case FMODE_READ|FMODE_WRITE:
 847                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 848                                 && state->n_rdwr != 0;
 849         }
 850 out:
 851         return ret;
 852 }
 853
 854 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 855 {
 856         if ((delegation->type & fmode) != fmode)
 857                 return 0;
 858         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 859                 return 0;
 860         nfs_mark_delegation_referenced(delegation);
 861         return 1;
 862 }
 863
 864 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 865 {
 866         switch (fmode) {
 867                 case FMODE_WRITE:
 868                         state->n_wronly++;
 869                         break;
 870                 case FMODE_READ:
 871                         state->n_rdonly++;
 872                         break;
 873                 case FMODE_READ|FMODE_WRITE:
 874                         state->n_rdwr++;
 875         }
 876         nfs4_state_set_mode_locked(state, state->state | fmode);
 877 }
 878
 879 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 880 {
 881         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 882                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 883         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 884         switch (fmode) {
 885                 case FMODE_READ:
 886                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 887                         break;
 888                 case FMODE_WRITE:
 889                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 890                         break;
 891                 case FMODE_READ|FMODE_WRITE:
 892                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 893         }
 894 }
 895
 896 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 897 {
 898         write_seqlock(&state->seqlock);
 899         nfs_set_open_stateid_locked(state, stateid, fmode);
 900         write_sequnlock(&state->seqlock);
 901 }
 902
 903 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 904 {
 905         /*
 906          * Protect the call to nfs4_state_set_mode_locked and
 907          * serialise the stateid update
 908          */
 909         write_seqlock(&state->seqlock);
 910         if (deleg_stateid != NULL) {
 911                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 912                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 913         }
 914         if (open_stateid != NULL)
 915                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 916         write_sequnlock(&state->seqlock);
 917         spin_lock(&state->owner->so_lock);
 918         update_open_stateflags(state, fmode);
 919         spin_unlock(&state->owner->so_lock);
 920 }
 921
 922 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 923 {
 924         struct nfs_inode *nfsi = NFS_I(state->inode);
 925         struct nfs_delegation *deleg_cur;
 926         int ret = 0;
 927
 928         fmode &= (FMODE_READ|FMODE_WRITE);
 929
 930         rcu_read_lock();
 931         deleg_cur = rcu_dereference(nfsi->delegation);
 932         if (deleg_cur == NULL)
 933                 goto no_delegation;
 934
 935         spin_lock(&deleg_cur->lock);
 936         if (nfsi->delegation != deleg_cur ||
 937             (deleg_cur->type & fmode) != fmode)
 938                 goto no_delegation_unlock;
 939
 940         if (delegation == NULL)
 941                 delegation = &deleg_cur->stateid;
 942         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 943                 goto no_delegation_unlock;
 944
 945         nfs_mark_delegation_referenced(deleg_cur);
 946         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 947         ret = 1;
 948 no_delegation_unlock:
 949         spin_unlock(&deleg_cur->lock);
 950 no_delegation:
 951         rcu_read_unlock();
 952
 953         if (!ret && open_stateid != NULL) {
 954                 __update_open_stateid(state, open_stateid, NULL, fmode);
 955                 ret = 1;
 956         }
 957
 958         return ret;
 959 }
 960
 961
 962 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 963 {
 964         struct nfs_delegation *delegation;
 965
 966         rcu_read_lock();
 967         delegation = rcu_dereference(NFS_I(inode)->delegation);
 968         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 969                 rcu_read_unlock();
 970                 return;
 971         }
 972         rcu_read_unlock();
 973         nfs_inode_return_delegation(inode);
 974 }
 975
 976 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 977 {
 978         struct nfs4_state *state = opendata->state;
 979         struct nfs_inode *nfsi = NFS_I(state->inode);
 980         struct nfs_delegation *delegation;
 981         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 982         fmode_t fmode = opendata->o_arg.fmode;
 983         nfs4_stateid stateid;
 984         int ret = -EAGAIN;
 985
 986         for (;;) {
 987                 if (can_open_cached(state, fmode, open_mode)) {
 988                         spin_lock(&state->owner->so_lock);
 989                         if (can_open_cached(state, fmode, open_mode)) {
 990                                 update_open_stateflags(state, fmode);
 991                                 spin_unlock(&state->owner->so_lock);
 992                                 goto out_return_state;
 993                         }
 994                         spin_unlock(&state->owner->so_lock);
 995                 }
 996                 rcu_read_lock();
 997                 delegation = rcu_dereference(nfsi->delegation);
 998                 if (delegation == NULL ||
 999                     !can_open_delegated(delegation, fmode)) {
1000                         rcu_read_unlock();
1001                         break;
1002                 }
1003                 /* Save the delegation */
1004                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1005                 rcu_read_unlock();
1006                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1007                 if (ret != 0)
1008                         goto out;
1009                 ret = -EAGAIN;
1010
1011                 /* Try to update the stateid using the delegation */
1012                 if (update_open_stateid(state, NULL, &stateid, fmode))
1013                         goto out_return_state;
1014         }
1015 out:
1016         return ERR_PTR(ret);
1017 out_return_state:
1018         atomic_inc(&state->count);
1019         return state;
1020 }
1021
1022 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1023 {
1024         struct inode *inode;
1025         struct nfs4_state *state = NULL;
1026         struct nfs_delegation *delegation;
1027         int ret;
1028
1029         if (!data->rpc_done) {
1030                 state = nfs4_try_open_cached(data);
1031                 goto out;
1032         }
1033
1034         ret = -EAGAIN;
1035         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1036                 goto err;
1037         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1038         ret = PTR_ERR(inode);
1039         if (IS_ERR(inode))
1040                 goto err;
1041         ret = -ENOMEM;
1042         state = nfs4_get_open_state(inode, data->owner);
1043         if (state == NULL)
1044                 goto err_put_inode;
1045         if (data->o_res.delegation_type != 0) {
1046                 int delegation_flags = 0;
1047
1048                 rcu_read_lock();
1049                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1050                 if (delegation)
1051                         delegation_flags = delegation->flags;
1052                 rcu_read_unlock();
1053                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1054                         nfs_inode_set_delegation(state->inode,
1055                                         data->owner->so_cred,
1056                                         &data->o_res);
1057                 else
1058                         nfs_inode_reclaim_delegation(state->inode,
1059                                         data->owner->so_cred,
1060                                         &data->o_res);
1061         }
1062
1063         update_open_stateid(state, &data->o_res.stateid, NULL,
1064                         data->o_arg.fmode);
1065         iput(inode);
1066 out:
1067         return state;
1068 err_put_inode:
1069         iput(inode);
1070 err:
1071         return ERR_PTR(ret);
1072 }
1073
1074 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1075 {
1076         struct nfs_inode *nfsi = NFS_I(state->inode);
1077         struct nfs_open_context *ctx;
1078
1079         spin_lock(&state->inode->i_lock);
1080         list_for_each_entry(ctx, &nfsi->open_files, list) {
1081                 if (ctx->state != state)
1082                         continue;
1083                 get_nfs_open_context(ctx);
1084                 spin_unlock(&state->inode->i_lock);
1085                 return ctx;
1086         }
1087         spin_unlock(&state->inode->i_lock);
1088         return ERR_PTR(-ENOENT);
1089 }
1090
1091 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1092 {
1093         struct nfs4_opendata *opendata;
1094
1095         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1096         if (opendata == NULL)
1097                 return ERR_PTR(-ENOMEM);
1098         opendata->state = state;
1099         atomic_inc(&state->count);
1100         return opendata;
1101 }
1102
1103 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1104 {
1105         struct nfs4_state *newstate;
1106         int ret;
1107
1108         opendata->o_arg.open_flags = 0;
1109         opendata->o_arg.fmode = fmode;
1110         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1111         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1112         nfs4_init_opendata_res(opendata);
1113         ret = _nfs4_recover_proc_open(opendata);
1114         if (ret != 0)
1115                 return ret;
1116         newstate = nfs4_opendata_to_nfs4_state(opendata);
1117         if (IS_ERR(newstate))
1118                 return PTR_ERR(newstate);
1119         nfs4_close_state(&opendata->path, newstate, fmode);
1120         *res = newstate;
1121         return 0;
1122 }
1123
1124 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1125 {
1126         struct nfs4_state *newstate;
1127         int ret;
1128
1129         /* memory barrier prior to reading state->n_* */
1130         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1131         smp_rmb();
1132         if (state->n_rdwr != 0) {
1133                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1134                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1135                 if (ret != 0)
1136                         return ret;
1137                 if (newstate != state)
1138                         return -ESTALE;
1139         }
1140         if (state->n_wronly != 0) {
1141                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1142                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1143                 if (ret != 0)
1144                         return ret;
1145                 if (newstate != state)
1146                         return -ESTALE;
1147         }
1148         if (state->n_rdonly != 0) {
1149                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1150                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1151                 if (ret != 0)
1152                         return ret;
1153                 if (newstate != state)
1154                         return -ESTALE;
1155         }
1156         /*
1157          * We may have performed cached opens for all three recoveries.
1158          * Check if we need to update the current stateid.
1159          */
1160         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1161             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1162                 write_seqlock(&state->seqlock);
1163                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1164                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1165                 write_sequnlock(&state->seqlock);
1166         }
1167         return 0;
1168 }
1169
1170 /*
1171  * OPEN_RECLAIM:
1172  *      reclaim state on the server after a reboot.
1173  */
1174 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1175 {
1176         struct nfs_delegation *delegation;
1177         struct nfs4_opendata *opendata;
1178         fmode_t delegation_type = 0;
1179         int status;
1180
1181         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1182         if (IS_ERR(opendata))
1183                 return PTR_ERR(opendata);
1184         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1185         opendata->o_arg.fh = NFS_FH(state->inode);
1186         rcu_read_lock();
1187         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1188         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1189                 delegation_type = delegation->type;
1190         rcu_read_unlock();
1191         opendata->o_arg.u.delegation_type = delegation_type;
1192         status = nfs4_open_recover(opendata, state);
1193         nfs4_opendata_put(opendata);
1194         return status;
1195 }
1196
1197 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1198 {
1199         struct nfs_server *server = NFS_SERVER(state->inode);
1200         struct nfs4_exception exception = { };
1201         int err;
1202         do {
1203                 err = _nfs4_do_open_reclaim(ctx, state);
1204                 if (err != -NFS4ERR_DELAY)
1205                         break;
1206                 nfs4_handle_exception(server, err, &exception);
1207         } while (exception.retry);
1208         return err;
1209 }
1210
1211 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1212 {
1213         struct nfs_open_context *ctx;
1214         int ret;
1215
1216         ctx = nfs4_state_find_open_context(state);
1217         if (IS_ERR(ctx))
1218                 return PTR_ERR(ctx);
1219         ret = nfs4_do_open_reclaim(ctx, state);
1220         put_nfs_open_context(ctx);
1221         return ret;
1222 }
1223
1224 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1225 {
1226         struct nfs4_opendata *opendata;
1227         int ret;
1228
1229         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1230         if (IS_ERR(opendata))
1231                 return PTR_ERR(opendata);
1232         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1233         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1234                         sizeof(opendata->o_arg.u.delegation.data));
1235         ret = nfs4_open_recover(opendata, state);
1236         nfs4_opendata_put(opendata);
1237         return ret;
1238 }
1239
1240 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1241 {
1242         struct nfs4_exception exception = { };
1243         struct nfs_server *server = NFS_SERVER(state->inode);
1244         int err;
1245         do {
1246                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1247                 switch (err) {
1248                         case 0:
1249                         case -ENOENT:
1250                         case -ESTALE:
1251                                 goto out;
1252                         case -NFS4ERR_BADSESSION:
1253                         case -NFS4ERR_BADSLOT:
1254                         case -NFS4ERR_BAD_HIGH_SLOT:
1255                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1256                         case -NFS4ERR_DEADSESSION:
1257                                 nfs4_schedule_state_recovery(
1258                                         server->nfs_client);
1259                                 goto out;
1260                         case -NFS4ERR_STALE_CLIENTID:
1261                         case -NFS4ERR_STALE_STATEID:
1262                         case -NFS4ERR_EXPIRED:
1263                                 /* Don't recall a delegation if it was lost */
1264                                 nfs4_schedule_state_recovery(server->nfs_client);
1265                                 goto out;
1266                         case -ERESTARTSYS:
1267                                 /*
1268                                  * The show must go on: exit, but mark the
1269                                  * stateid as needing recovery.
1270                                  */
1271                         case -NFS4ERR_ADMIN_REVOKED:
1272                         case -NFS4ERR_BAD_STATEID:
1273                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1274                         case -EKEYEXPIRED:
1275                                 /*
1276                                  * User RPCSEC_GSS context has expired.
1277                                  * We cannot recover this stateid now, so
1278                                  * skip it and allow recovery thread to
1279                                  * proceed.
1280                                  */
1281                         case -ENOMEM:
1282                                 err = 0;
1283                                 goto out;
1284                 }
1285                 err = nfs4_handle_exception(server, err, &exception);
1286         } while (exception.retry);
1287 out:
1288         return err;
1289 }
1290
1291 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1292 {
1293         struct nfs4_opendata *data = calldata;
1294
1295         data->rpc_status = task->tk_status;
1296         if (data->rpc_status == 0) {
1297                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1298                                 sizeof(data->o_res.stateid.data));
1299                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1300                 renew_lease(data->o_res.server, data->timestamp);
1301                 data->rpc_done = 1;
1302         }
1303 }
1304
1305 static void nfs4_open_confirm_release(void *calldata)
1306 {
1307         struct nfs4_opendata *data = calldata;
1308         struct nfs4_state *state = NULL;
1309
1310         /* If this request hasn't been cancelled, do nothing */
1311         if (data->cancelled == 0)
1312                 goto out_free;
1313         /* In case of error, no cleanup! */
1314         if (!data->rpc_done)
1315                 goto out_free;
1316         state = nfs4_opendata_to_nfs4_state(data);
1317         if (!IS_ERR(state))
1318                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1319 out_free:
1320         nfs4_opendata_put(data);
1321 }
1322
1323 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1324         .rpc_call_done = nfs4_open_confirm_done,
1325         .rpc_release = nfs4_open_confirm_release,
1326 };
1327
1328 /*
1329  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1330  */
1331 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1332 {
1333         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1334         struct rpc_task *task;
1335         struct  rpc_message msg = {
1336                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1337                 .rpc_argp = &data->c_arg,
1338                 .rpc_resp = &data->c_res,
1339                 .rpc_cred = data->owner->so_cred,
1340         };
1341         struct rpc_task_setup task_setup_data = {
1342                 .rpc_client = server->client,
1343                 .rpc_message = &msg,
1344                 .callback_ops = &nfs4_open_confirm_ops,
1345                 .callback_data = data,
1346                 .workqueue = nfsiod_workqueue,
1347                 .flags = RPC_TASK_ASYNC,
1348         };
1349         int status;
1350
1351         kref_get(&data->kref);
1352         data->rpc_done = 0;
1353         data->rpc_status = 0;
1354         data->timestamp = jiffies;
1355         task = rpc_run_task(&task_setup_data);
1356         if (IS_ERR(task))
1357                 return PTR_ERR(task);
1358         status = nfs4_wait_for_completion_rpc_task(task);
1359         if (status != 0) {
1360                 data->cancelled = 1;
1361                 smp_wmb();
1362         } else
1363                 status = data->rpc_status;
1364         rpc_put_task(task);
1365         return status;
1366 }
1367
1368 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1369 {
1370         struct nfs4_opendata *data = calldata;
1371         struct nfs4_state_owner *sp = data->owner;
1372
1373         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1374                 return;
1375         /*
1376          * Check if we still need to send an OPEN call, or if we can use
1377          * a delegation instead.
1378          */
1379         if (data->state != NULL) {
1380                 struct nfs_delegation *delegation;
1381
1382                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1383                         goto out_no_action;
1384                 rcu_read_lock();
1385                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1386                 if (delegation != NULL &&
1387                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1388                         rcu_read_unlock();
1389                         goto out_no_action;
1390                 }
1391                 rcu_read_unlock();
1392         }
1393         /* Update sequence id. */
1394         data->o_arg.id = sp->so_owner_id.id;
1395         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1396         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1397                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1398                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1399         }
1400         data->timestamp = jiffies;
1401         if (nfs4_setup_sequence(data->o_arg.server,
1402                                 &data->o_arg.seq_args,
1403                                 &data->o_res.seq_res, 1, task))
1404                 return;
1405         rpc_call_start(task);
1406         return;
1407 out_no_action:
1408         task->tk_action = NULL;
1409
1410 }
1411
1412 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1413 {
1414         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1415         nfs4_open_prepare(task, calldata);
1416 }
1417
1418 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1419 {
1420         struct nfs4_opendata *data = calldata;
1421
1422         data->rpc_status = task->tk_status;
1423
1424         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1425                 return;
1426
1427         if (task->tk_status == 0) {
1428                 switch (data->o_res.f_attr->mode & S_IFMT) {
1429                         case S_IFREG:
1430                                 break;
1431                         case S_IFLNK:
1432                                 data->rpc_status = -ELOOP;
1433                                 break;
1434                         case S_IFDIR:
1435                                 data->rpc_status = -EISDIR;
1436                                 break;
1437                         default:
1438                                 data->rpc_status = -ENOTDIR;
1439                 }
1440                 renew_lease(data->o_res.server, data->timestamp);
1441                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1442                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1443         }
1444         data->rpc_done = 1;
1445 }
1446
1447 static void nfs4_open_release(void *calldata)
1448 {
1449         struct nfs4_opendata *data = calldata;
1450         struct nfs4_state *state = NULL;
1451
1452         /* If this request hasn't been cancelled, do nothing */
1453         if (data->cancelled == 0)
1454                 goto out_free;
1455         /* In case of error, no cleanup! */
1456         if (data->rpc_status != 0 || !data->rpc_done)
1457                 goto out_free;
1458         /* In case we need an open_confirm, no cleanup! */
1459         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1460                 goto out_free;
1461         state = nfs4_opendata_to_nfs4_state(data);
1462         if (!IS_ERR(state))
1463                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1464 out_free:
1465         nfs4_opendata_put(data);
1466 }
1467
1468 static const struct rpc_call_ops nfs4_open_ops = {
1469         .rpc_call_prepare = nfs4_open_prepare,
1470         .rpc_call_done = nfs4_open_done,
1471         .rpc_release = nfs4_open_release,
1472 };
1473
1474 static const struct rpc_call_ops nfs4_recover_open_ops = {
1475         .rpc_call_prepare = nfs4_recover_open_prepare,
1476         .rpc_call_done = nfs4_open_done,
1477         .rpc_release = nfs4_open_release,
1478 };
1479
1480 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1481 {
1482         struct inode *dir = data->dir->d_inode;
1483         struct nfs_server *server = NFS_SERVER(dir);
1484         struct nfs_openargs *o_arg = &data->o_arg;
1485         struct nfs_openres *o_res = &data->o_res;
1486         struct rpc_task *task;
1487         struct rpc_message msg = {
1488                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1489                 .rpc_argp = o_arg,
1490                 .rpc_resp = o_res,
1491                 .rpc_cred = data->owner->so_cred,
1492         };
1493         struct rpc_task_setup task_setup_data = {
1494                 .rpc_client = server->client,
1495                 .rpc_message = &msg,
1496                 .callback_ops = &nfs4_open_ops,
1497                 .callback_data = data,
1498                 .workqueue = nfsiod_workqueue,
1499                 .flags = RPC_TASK_ASYNC,
1500         };
1501         int status;
1502
1503         kref_get(&data->kref);
1504         data->rpc_done = 0;
1505         data->rpc_status = 0;
1506         data->cancelled = 0;
1507         if (isrecover)
1508                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1509         task = rpc_run_task(&task_setup_data);
1510         if (IS_ERR(task))
1511                 return PTR_ERR(task);
1512         status = nfs4_wait_for_completion_rpc_task(task);
1513         if (status != 0) {
1514                 data->cancelled = 1;
1515                 smp_wmb();
1516         } else
1517                 status = data->rpc_status;
1518         rpc_put_task(task);
1519
1520         return status;
1521 }
1522
1523 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1524 {
1525         struct inode *dir = data->dir->d_inode;
1526         struct nfs_openres *o_res = &data->o_res;
1527         int status;
1528
1529         status = nfs4_run_open_task(data, 1);
1530         if (status != 0 || !data->rpc_done)
1531                 return status;
1532
1533         nfs_refresh_inode(dir, o_res->dir_attr);
1534
1535         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1536                 status = _nfs4_proc_open_confirm(data);
1537                 if (status != 0)
1538                         return status;
1539         }
1540
1541         return status;
1542 }
1543
1544 /*
1545  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1546  */
1547 static int _nfs4_proc_open(struct nfs4_opendata *data)
1548 {
1549         struct inode *dir = data->dir->d_inode;
1550         struct nfs_server *server = NFS_SERVER(dir);
1551         struct nfs_openargs *o_arg = &data->o_arg;
1552         struct nfs_openres *o_res = &data->o_res;
1553         int status;
1554
1555         status = nfs4_run_open_task(data, 0);
1556         if (status != 0 || !data->rpc_done)
1557                 return status;
1558
1559         if (o_arg->open_flags & O_CREAT) {
1560                 update_changeattr(dir, &o_res->cinfo);
1561                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1562         } else
1563                 nfs_refresh_inode(dir, o_res->dir_attr);
1564         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1565                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1566         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1567                 status = _nfs4_proc_open_confirm(data);
1568                 if (status != 0)
1569                         return status;
1570         }
1571         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1572                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1573         return 0;
1574 }
1575
1576 static int nfs4_recover_expired_lease(struct nfs_server *server)
1577 {
1578         struct nfs_client *clp = server->nfs_client;
1579         unsigned int loop;
1580         int ret;
1581
1582         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1583                 ret = nfs4_wait_clnt_recover(clp);
1584                 if (ret != 0)
1585                         break;
1586                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1587                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1588                         break;
1589                 nfs4_schedule_state_recovery(clp);
1590                 ret = -EIO;
1591         }
1592         return ret;
1593 }
1594
1595 /*
1596  * OPEN_EXPIRED:
1597  *      reclaim state on the server after a network partition.
1598  *      Assumes caller holds the appropriate lock
1599  */
1600 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1601 {
1602         struct nfs4_opendata *opendata;
1603         int ret;
1604
1605         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1606         if (IS_ERR(opendata))
1607                 return PTR_ERR(opendata);
1608         ret = nfs4_open_recover(opendata, state);
1609         if (ret == -ESTALE)
1610                 d_drop(ctx->path.dentry);
1611         nfs4_opendata_put(opendata);
1612         return ret;
1613 }
1614
1615 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1616 {
1617         struct nfs_server *server = NFS_SERVER(state->inode);
1618         struct nfs4_exception exception = { };
1619         int err;
1620
1621         do {
1622                 err = _nfs4_open_expired(ctx, state);
1623                 switch (err) {
1624                 default:
1625                         goto out;
1626                 case -NFS4ERR_GRACE:
1627                 case -NFS4ERR_DELAY:
1628                         nfs4_handle_exception(server, err, &exception);
1629                         err = 0;
1630                 }
1631         } while (exception.retry);
1632 out:
1633         return err;
1634 }
1635
1636 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1637 {
1638         struct nfs_open_context *ctx;
1639         int ret;
1640
1641         ctx = nfs4_state_find_open_context(state);
1642         if (IS_ERR(ctx))
1643                 return PTR_ERR(ctx);
1644         ret = nfs4_do_open_expired(ctx, state);
1645         put_nfs_open_context(ctx);
1646         return ret;
1647 }
1648
1649 /*
1650  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1651  * fields corresponding to attributes that were used to store the verifier.
1652  * Make sure we clobber those fields in the later setattr call
1653  */
1654 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1655 {
1656         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1657             !(sattr->ia_valid & ATTR_ATIME_SET))
1658                 sattr->ia_valid |= ATTR_ATIME;
1659
1660         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1661             !(sattr->ia_valid & ATTR_MTIME_SET))
1662                 sattr->ia_valid |= ATTR_MTIME;
1663 }
1664
1665 /*
1666  * Returns a referenced nfs4_state
1667  */
1668 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)
1669 {
1670         struct nfs4_state_owner  *sp;
1671         struct nfs4_state     *state = NULL;
1672         struct nfs_server       *server = NFS_SERVER(dir);
1673         struct nfs4_opendata *opendata;
1674         int status;
1675
1676         /* Protect against reboot recovery conflicts */
1677         status = -ENOMEM;
1678         if (!(sp = nfs4_get_state_owner(server, cred))) {
1679                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1680                 goto out_err;
1681         }
1682         status = nfs4_recover_expired_lease(server);
1683         if (status != 0)
1684                 goto err_put_state_owner;
1685         if (path->dentry->d_inode != NULL)
1686                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1687         status = -ENOMEM;
1688         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1689         if (opendata == NULL)
1690                 goto err_put_state_owner;
1691
1692         if (path->dentry->d_inode != NULL)
1693                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1694
1695         status = _nfs4_proc_open(opendata);
1696         if (status != 0)
1697                 goto err_opendata_put;
1698
1699         state = nfs4_opendata_to_nfs4_state(opendata);
1700         status = PTR_ERR(state);
1701         if (IS_ERR(state))
1702                 goto err_opendata_put;
1703         if (server->caps & NFS_CAP_POSIX_LOCK)
1704                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1705
1706         if (opendata->o_arg.open_flags & O_EXCL) {
1707                 nfs4_exclusive_attrset(opendata, sattr);
1708
1709                 nfs_fattr_init(opendata->o_res.f_attr);
1710                 status = nfs4_do_setattr(state->inode, cred,
1711                                 opendata->o_res.f_attr, sattr,
1712                                 state);
1713                 if (status == 0)
1714                         nfs_setattr_update_inode(state->inode, sattr);
1715                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1716         }
1717         nfs4_opendata_put(opendata);
1718         nfs4_put_state_owner(sp);
1719         *res = state;
1720         return 0;
1721 err_opendata_put:
1722         nfs4_opendata_put(opendata);
1723 err_put_state_owner:
1724         nfs4_put_state_owner(sp);
1725 out_err:
1726         *res = NULL;
1727         return status;
1728 }
1729
1730
1731 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)
1732 {
1733         struct nfs4_exception exception = { };
1734         struct nfs4_state *res;
1735         int status;
1736
1737         do {
1738                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1739                 if (status == 0)
1740                         break;
1741                 /* NOTE: BAD_SEQID means the server and client disagree about the
1742                  * book-keeping w.r.t. state-changing operations
1743                  * (OPEN/CLOSE/LOCK/LOCKU...)
1744                  * It is actually a sign of a bug on the client or on the server.
1745                  *
1746                  * If we receive a BAD_SEQID error in the particular case of
1747                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1748                  * have unhashed the old state_owner for us, and that we can
1749                  * therefore safely retry using a new one. We should still warn
1750                  * the user though...
1751                  */
1752                 if (status == -NFS4ERR_BAD_SEQID) {
1753                         printk(KERN_WARNING "NFS: v4 server %s "
1754                                         " returned a bad sequence-id error!\n",
1755                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1756                         exception.retry = 1;
1757                         continue;
1758                 }
1759                 /*
1760                  * BAD_STATEID on OPEN means that the server cancelled our
1761                  * state before it received the OPEN_CONFIRM.
1762                  * Recover by retrying the request as per the discussion
1763                  * on Page 181 of RFC3530.
1764                  */
1765                 if (status == -NFS4ERR_BAD_STATEID) {
1766                         exception.retry = 1;
1767                         continue;
1768                 }
1769                 if (status == -EAGAIN) {
1770                         /* We must have found a delegation */
1771                         exception.retry = 1;
1772                         continue;
1773                 }
1774                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1775                                         status, &exception));
1776         } while (exception.retry);
1777         return res;
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 nfs_setattrargs  arg = {
1786                 .fh             = NFS_FH(inode),
1787                 .iap            = sattr,
1788                 .server         = server,
1789                 .bitmask = server->attr_bitmask,
1790         };
1791         struct nfs_setattrres  res = {
1792                 .fattr          = fattr,
1793                 .server         = server,
1794         };
1795         struct rpc_message msg = {
1796                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1797                 .rpc_argp       = &arg,
1798                 .rpc_resp       = &res,
1799                 .rpc_cred       = cred,
1800         };
1801         unsigned long timestamp = jiffies;
1802         int status;
1803
1804         nfs_fattr_init(fattr);
1805
1806         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1807                 /* Use that stateid */
1808         } else if (state != NULL) {
1809                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1810         } else
1811                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1812
1813         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1814         if (status == 0 && state != NULL)
1815                 renew_lease(server, timestamp);
1816         return status;
1817 }
1818
1819 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1820                            struct nfs_fattr *fattr, struct iattr *sattr,
1821                            struct nfs4_state *state)
1822 {
1823         struct nfs_server *server = NFS_SERVER(inode);
1824         struct nfs4_exception exception = { };
1825         int err;
1826         do {
1827                 err = nfs4_handle_exception(server,
1828                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1829                                 &exception);
1830         } while (exception.retry);
1831         return err;
1832 }
1833
1834 struct nfs4_closedata {
1835         struct path path;
1836         struct inode *inode;
1837         struct nfs4_state *state;
1838         struct nfs_closeargs arg;
1839         struct nfs_closeres res;
1840         struct nfs_fattr fattr;
1841         unsigned long timestamp;
1842         bool roc;
1843         u32 roc_barrier;
1844 };
1845
1846 static void nfs4_free_closedata(void *data)
1847 {
1848         struct nfs4_closedata *calldata = data;
1849         struct nfs4_state_owner *sp = calldata->state->owner;
1850
1851         if (calldata->roc)
1852                 pnfs_roc_release(calldata->state->inode);
1853         nfs4_put_open_state(calldata->state);
1854         nfs_free_seqid(calldata->arg.seqid);
1855         nfs4_put_state_owner(sp);
1856         path_put(&calldata->path);
1857         kfree(calldata);
1858 }
1859
1860 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1861                 fmode_t fmode)
1862 {
1863         spin_lock(&state->owner->so_lock);
1864         if (!(fmode & FMODE_READ))
1865                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1866         if (!(fmode & FMODE_WRITE))
1867                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1868         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1869         spin_unlock(&state->owner->so_lock);
1870 }
1871
1872 static void nfs4_close_done(struct rpc_task *task, void *data)
1873 {
1874         struct nfs4_closedata *calldata = data;
1875         struct nfs4_state *state = calldata->state;
1876         struct nfs_server *server = NFS_SERVER(calldata->inode);
1877
1878         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1879                 return;
1880         /* hmm. we are done with the inode, and in the process of freeing
1881          * the state_owner. we keep this around to process errors
1882          */
1883         switch (task->tk_status) {
1884                 case 0:
1885                         if (calldata->roc)
1886                                 pnfs_roc_set_barrier(state->inode,
1887                                                      calldata->roc_barrier);
1888                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1889                         renew_lease(server, calldata->timestamp);
1890                         nfs4_close_clear_stateid_flags(state,
1891                                         calldata->arg.fmode);
1892                         break;
1893                 case -NFS4ERR_STALE_STATEID:
1894                 case -NFS4ERR_OLD_STATEID:
1895                 case -NFS4ERR_BAD_STATEID:
1896                 case -NFS4ERR_EXPIRED:
1897                         if (calldata->arg.fmode == 0)
1898                                 break;
1899                 default:
1900                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1901                                 rpc_restart_call_prepare(task);
1902         }
1903         nfs_release_seqid(calldata->arg.seqid);
1904         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1905 }
1906
1907 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1908 {
1909         struct nfs4_closedata *calldata = data;
1910         struct nfs4_state *state = calldata->state;
1911         int call_close = 0;
1912
1913         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1914                 return;
1915
1916         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1917         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1918         spin_lock(&state->owner->so_lock);
1919         /* Calculate the change in open mode */
1920         if (state->n_rdwr == 0) {
1921                 if (state->n_rdonly == 0) {
1922                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1923                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1924                         calldata->arg.fmode &= ~FMODE_READ;
1925                 }
1926                 if (state->n_wronly == 0) {
1927                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1928                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1929                         calldata->arg.fmode &= ~FMODE_WRITE;
1930                 }
1931         }
1932         spin_unlock(&state->owner->so_lock);
1933
1934         if (!call_close) {
1935                 /* Note: exit _without_ calling nfs4_close_done */
1936                 task->tk_action = NULL;
1937                 return;
1938         }
1939
1940         if (calldata->arg.fmode == 0) {
1941                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1942                 if (calldata->roc &&
1943                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
1944                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
1945                                      task, NULL);
1946                         return;
1947                 }
1948         }
1949
1950         nfs_fattr_init(calldata->res.fattr);
1951         calldata->timestamp = jiffies;
1952         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1953                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1954                                 1, task))
1955                 return;
1956         rpc_call_start(task);
1957 }
1958
1959 static const struct rpc_call_ops nfs4_close_ops = {
1960         .rpc_call_prepare = nfs4_close_prepare,
1961         .rpc_call_done = nfs4_close_done,
1962         .rpc_release = nfs4_free_closedata,
1963 };
1964
1965 /*
1966  * It is possible for data to be read/written from a mem-mapped file
1967  * after the sys_close call (which hits the vfs layer as a flush).
1968  * This means that we can't safely call nfsv4 close on a file until
1969  * the inode is cleared. This in turn means that we are not good
1970  * NFSv4 citizens - we do not indicate to the server to update the file's
1971  * share state even when we are done with one of the three share
1972  * stateid's in the inode.
1973  *
1974  * NOTE: Caller must be holding the sp->so_owner semaphore!
1975  */
1976 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
1977 {
1978         struct nfs_server *server = NFS_SERVER(state->inode);
1979         struct nfs4_closedata *calldata;
1980         struct nfs4_state_owner *sp = state->owner;
1981         struct rpc_task *task;
1982         struct rpc_message msg = {
1983                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1984                 .rpc_cred = state->owner->so_cred,
1985         };
1986         struct rpc_task_setup task_setup_data = {
1987                 .rpc_client = server->client,
1988                 .rpc_message = &msg,
1989                 .callback_ops = &nfs4_close_ops,
1990                 .workqueue = nfsiod_workqueue,
1991                 .flags = RPC_TASK_ASYNC,
1992         };
1993         int status = -ENOMEM;
1994
1995         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1996         if (calldata == NULL)
1997                 goto out;
1998         calldata->inode = state->inode;
1999         calldata->state = state;
2000         calldata->arg.fh = NFS_FH(state->inode);
2001         calldata->arg.stateid = &state->open_stateid;
2002         /* Serialization for the sequence id */
2003         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2004         if (calldata->arg.seqid == NULL)
2005                 goto out_free_calldata;
2006         calldata->arg.fmode = 0;
2007         calldata->arg.bitmask = server->cache_consistency_bitmask;
2008         calldata->res.fattr = &calldata->fattr;
2009         calldata->res.seqid = calldata->arg.seqid;
2010         calldata->res.server = server;
2011         calldata->roc = roc;
2012         path_get(path);
2013         calldata->path = *path;
2014
2015         msg.rpc_argp = &calldata->arg;
2016         msg.rpc_resp = &calldata->res;
2017         task_setup_data.callback_data = calldata;
2018         task = rpc_run_task(&task_setup_data);
2019         if (IS_ERR(task))
2020                 return PTR_ERR(task);
2021         status = 0;
2022         if (wait)
2023                 status = rpc_wait_for_completion_task(task);
2024         rpc_put_task(task);
2025         return status;
2026 out_free_calldata:
2027         kfree(calldata);
2028 out:
2029         if (roc)
2030                 pnfs_roc_release(state->inode);
2031         nfs4_put_open_state(state);
2032         nfs4_put_state_owner(sp);
2033         return status;
2034 }
2035
2036 static struct inode *
2037 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2038 {
2039         struct nfs4_state *state;
2040
2041         /* Protect against concurrent sillydeletes */
2042         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2043         if (IS_ERR(state))
2044                 return ERR_CAST(state);
2045         ctx->state = state;
2046         return igrab(state->inode);
2047 }
2048
2049 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2050 {
2051         if (ctx->state == NULL)
2052                 return;
2053         if (is_sync)
2054                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2055         else
2056                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2057 }
2058
2059 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2060 {
2061         struct nfs4_server_caps_arg args = {
2062                 .fhandle = fhandle,
2063         };
2064         struct nfs4_server_caps_res res = {};
2065         struct rpc_message msg = {
2066                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2067                 .rpc_argp = &args,
2068                 .rpc_resp = &res,
2069         };
2070         int status;
2071
2072         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2073         if (status == 0) {
2074                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2075                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2076                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2077                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2078                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2079                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2080                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2081                         server->caps |= NFS_CAP_ACLS;
2082                 if (res.has_links != 0)
2083                         server->caps |= NFS_CAP_HARDLINKS;
2084                 if (res.has_symlinks != 0)
2085                         server->caps |= NFS_CAP_SYMLINKS;
2086                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2087                         server->caps |= NFS_CAP_FILEID;
2088                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2089                         server->caps |= NFS_CAP_MODE;
2090                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2091                         server->caps |= NFS_CAP_NLINK;
2092                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2093                         server->caps |= NFS_CAP_OWNER;
2094                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2095                         server->caps |= NFS_CAP_OWNER_GROUP;
2096                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2097                         server->caps |= NFS_CAP_ATIME;
2098                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2099                         server->caps |= NFS_CAP_CTIME;
2100                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2101                         server->caps |= NFS_CAP_MTIME;
2102
2103                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2104                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2105                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2106                 server->acl_bitmask = res.acl_bitmask;
2107         }
2108
2109         return status;
2110 }
2111
2112 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2113 {
2114         struct nfs4_exception exception = { };
2115         int err;
2116         do {
2117                 err = nfs4_handle_exception(server,
2118                                 _nfs4_server_capabilities(server, fhandle),
2119                                 &exception);
2120         } while (exception.retry);
2121         return err;
2122 }
2123
2124 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2125                 struct nfs_fsinfo *info)
2126 {
2127         struct nfs4_lookup_root_arg args = {
2128                 .bitmask = nfs4_fattr_bitmap,
2129         };
2130         struct nfs4_lookup_res res = {
2131                 .server = server,
2132                 .fattr = info->fattr,
2133                 .fh = fhandle,
2134         };
2135         struct rpc_message msg = {
2136                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2137                 .rpc_argp = &args,
2138                 .rpc_resp = &res,
2139         };
2140
2141         nfs_fattr_init(info->fattr);
2142         return nfs4_call_sync(server, &msg, &args, &res, 0);
2143 }
2144
2145 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2146                 struct nfs_fsinfo *info)
2147 {
2148         struct nfs4_exception exception = { };
2149         int err;
2150         do {
2151                 err = nfs4_handle_exception(server,
2152                                 _nfs4_lookup_root(server, fhandle, info),
2153                                 &exception);
2154         } while (exception.retry);
2155         return err;
2156 }
2157
2158 /*
2159  * get the file handle for the "/" directory on the server
2160  */
2161 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2162                               struct nfs_fsinfo *info)
2163 {
2164         int status;
2165
2166         status = nfs4_lookup_root(server, fhandle, info);
2167         if (status == 0)
2168                 status = nfs4_server_capabilities(server, fhandle);
2169         if (status == 0)
2170                 status = nfs4_do_fsinfo(server, fhandle, info);
2171         return nfs4_map_errors(status);
2172 }
2173
2174 /*
2175  * Get locations and (maybe) other attributes of a referral.
2176  * Note that we'll actually follow the referral later when
2177  * we detect fsid mismatch in inode revalidation
2178  */
2179 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2180 {
2181         int status = -ENOMEM;
2182         struct page *page = NULL;
2183         struct nfs4_fs_locations *locations = NULL;
2184
2185         page = alloc_page(GFP_KERNEL);
2186         if (page == NULL)
2187                 goto out;
2188         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2189         if (locations == NULL)
2190                 goto out;
2191
2192         status = nfs4_proc_fs_locations(dir, name, locations, page);
2193         if (status != 0)
2194                 goto out;
2195         /* Make sure server returned a different fsid for the referral */
2196         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2197                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2198                 status = -EIO;
2199                 goto out;
2200         }
2201
2202         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2203         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2204         if (!fattr->mode)
2205                 fattr->mode = S_IFDIR;
2206         memset(fhandle, 0, sizeof(struct nfs_fh));
2207 out:
2208         if (page)
2209                 __free_page(page);
2210         kfree(locations);
2211         return status;
2212 }
2213
2214 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2215 {
2216         struct nfs4_getattr_arg args = {
2217                 .fh = fhandle,
2218                 .bitmask = server->attr_bitmask,
2219         };
2220         struct nfs4_getattr_res res = {
2221                 .fattr = fattr,
2222                 .server = server,
2223         };
2224         struct rpc_message msg = {
2225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2226                 .rpc_argp = &args,
2227                 .rpc_resp = &res,
2228         };
2229
2230         nfs_fattr_init(fattr);
2231         return nfs4_call_sync(server, &msg, &args, &res, 0);
2232 }
2233
2234 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2235 {
2236         struct nfs4_exception exception = { };
2237         int err;
2238         do {
2239                 err = nfs4_handle_exception(server,
2240                                 _nfs4_proc_getattr(server, fhandle, fattr),
2241                                 &exception);
2242         } while (exception.retry);
2243         return err;
2244 }
2245
2246 /*
2247  * The file is not closed if it is opened due to the a request to change
2248  * the size of the file. The open call will not be needed once the
2249  * VFS layer lookup-intents are implemented.
2250  *
2251  * Close is called when the inode is destroyed.
2252  * If we haven't opened the file for O_WRONLY, we
2253  * need to in the size_change case to obtain a stateid.
2254  *
2255  * Got race?
2256  * Because OPEN is always done by name in nfsv4, it is
2257  * possible that we opened a different file by the same
2258  * name.  We can recognize this race condition, but we
2259  * can't do anything about it besides returning an error.
2260  *
2261  * This will be fixed with VFS changes (lookup-intent).
2262  */
2263 static int
2264 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2265                   struct iattr *sattr)
2266 {
2267         struct inode *inode = dentry->d_inode;
2268         struct rpc_cred *cred = NULL;
2269         struct nfs4_state *state = NULL;
2270         int status;
2271
2272         nfs_fattr_init(fattr);
2273
2274         /* Search for an existing open(O_WRITE) file */
2275         if (sattr->ia_valid & ATTR_FILE) {
2276                 struct nfs_open_context *ctx;
2277
2278                 ctx = nfs_file_open_context(sattr->ia_file);
2279                 if (ctx) {
2280                         cred = ctx->cred;
2281                         state = ctx->state;
2282                 }
2283         }
2284
2285         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2286         if (status == 0)
2287                 nfs_setattr_update_inode(inode, sattr);
2288         return status;
2289 }
2290
2291 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2292                 const struct qstr *name, struct nfs_fh *fhandle,
2293                 struct nfs_fattr *fattr)
2294 {
2295         int                    status;
2296         struct nfs4_lookup_arg args = {
2297                 .bitmask = server->attr_bitmask,
2298                 .dir_fh = dirfh,
2299                 .name = name,
2300         };
2301         struct nfs4_lookup_res res = {
2302                 .server = server,
2303                 .fattr = fattr,
2304                 .fh = fhandle,
2305         };
2306         struct rpc_message msg = {
2307                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2308                 .rpc_argp = &args,
2309                 .rpc_resp = &res,
2310         };
2311
2312         nfs_fattr_init(fattr);
2313
2314         dprintk("NFS call  lookupfh %s\n", name->name);
2315         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2316         dprintk("NFS reply lookupfh: %d\n", status);
2317         return status;
2318 }
2319
2320 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2321                               struct qstr *name, struct nfs_fh *fhandle,
2322                               struct nfs_fattr *fattr)
2323 {
2324         struct nfs4_exception exception = { };
2325         int err;
2326         do {
2327                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2328                 /* FIXME: !!!! */
2329                 if (err == -NFS4ERR_MOVED) {
2330                         err = -EREMOTE;
2331                         break;
2332                 }
2333                 err = nfs4_handle_exception(server, err, &exception);
2334         } while (exception.retry);
2335         return err;
2336 }
2337
2338 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2339                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2340 {
2341         int status;
2342
2343         dprintk("NFS call  lookup %s\n", name->name);
2344         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2345         if (status == -NFS4ERR_MOVED)
2346                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2347         dprintk("NFS reply lookup: %d\n", status);
2348         return status;
2349 }
2350
2351 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2352 {
2353         struct nfs4_exception exception = { };
2354         int err;
2355         do {
2356                 err = nfs4_handle_exception(NFS_SERVER(dir),
2357                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2358                                 &exception);
2359         } while (exception.retry);
2360         return err;
2361 }
2362
2363 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2364 {
2365         struct nfs_server *server = NFS_SERVER(inode);
2366         struct nfs4_accessargs args = {
2367                 .fh = NFS_FH(inode),
2368                 .bitmask = server->attr_bitmask,
2369         };
2370         struct nfs4_accessres res = {
2371                 .server = server,
2372         };
2373         struct rpc_message msg = {
2374                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2375                 .rpc_argp = &args,
2376                 .rpc_resp = &res,
2377                 .rpc_cred = entry->cred,
2378         };
2379         int mode = entry->mask;
2380         int status;
2381
2382         /*
2383          * Determine which access bits we want to ask for...
2384          */
2385         if (mode & MAY_READ)
2386                 args.access |= NFS4_ACCESS_READ;
2387         if (S_ISDIR(inode->i_mode)) {
2388                 if (mode & MAY_WRITE)
2389                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2390                 if (mode & MAY_EXEC)
2391                         args.access |= NFS4_ACCESS_LOOKUP;
2392         } else {
2393                 if (mode & MAY_WRITE)
2394                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2395                 if (mode & MAY_EXEC)
2396                         args.access |= NFS4_ACCESS_EXECUTE;
2397         }
2398
2399         res.fattr = nfs_alloc_fattr();
2400         if (res.fattr == NULL)
2401                 return -ENOMEM;
2402
2403         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2404         if (!status) {
2405                 entry->mask = 0;
2406                 if (res.access & NFS4_ACCESS_READ)
2407                         entry->mask |= MAY_READ;
2408                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2409                         entry->mask |= MAY_WRITE;
2410                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2411                         entry->mask |= MAY_EXEC;
2412                 nfs_refresh_inode(inode, res.fattr);
2413         }
2414         nfs_free_fattr(res.fattr);
2415         return status;
2416 }
2417
2418 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2419 {
2420         struct nfs4_exception exception = { };
2421         int err;
2422         do {
2423                 err = nfs4_handle_exception(NFS_SERVER(inode),
2424                                 _nfs4_proc_access(inode, entry),
2425                                 &exception);
2426         } while (exception.retry);
2427         return err;
2428 }
2429
2430 /*
2431  * TODO: For the time being, we don't try to get any attributes
2432  * along with any of the zero-copy operations READ, READDIR,
2433  * READLINK, WRITE.
2434  *
2435  * In the case of the first three, we want to put the GETATTR
2436  * after the read-type operation -- this is because it is hard
2437  * to predict the length of a GETATTR response in v4, and thus
2438  * align the READ data correctly.  This means that the GETATTR
2439  * may end up partially falling into the page cache, and we should
2440  * shift it into the 'tail' of the xdr_buf before processing.
2441  * To do this efficiently, we need to know the total length
2442  * of data received, which doesn't seem to be available outside
2443  * of the RPC layer.
2444  *
2445  * In the case of WRITE, we also want to put the GETATTR after
2446  * the operation -- in this case because we want to make sure
2447  * we get the post-operation mtime and size.  This means that
2448  * we can't use xdr_encode_pages() as written: we need a variant
2449  * of it which would leave room in the 'tail' iovec.
2450  *
2451  * Both of these changes to the XDR layer would in fact be quite
2452  * minor, but I decided to leave them for a subsequent patch.
2453  */
2454 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2455                 unsigned int pgbase, unsigned int pglen)
2456 {
2457         struct nfs4_readlink args = {
2458                 .fh       = NFS_FH(inode),
2459                 .pgbase   = pgbase,
2460                 .pglen    = pglen,
2461                 .pages    = &page,
2462         };
2463         struct nfs4_readlink_res res;
2464         struct rpc_message msg = {
2465                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2466                 .rpc_argp = &args,
2467                 .rpc_resp = &res,
2468         };
2469
2470         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2471 }
2472
2473 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2474                 unsigned int pgbase, unsigned int pglen)
2475 {
2476         struct nfs4_exception exception = { };
2477         int err;
2478         do {
2479                 err = nfs4_handle_exception(NFS_SERVER(inode),
2480                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2481                                 &exception);
2482         } while (exception.retry);
2483         return err;
2484 }
2485
2486 /*
2487  * Got race?
2488  * We will need to arrange for the VFS layer to provide an atomic open.
2489  * Until then, this create/open method is prone to inefficiency and race
2490  * conditions due to the lookup, create, and open VFS calls from sys_open()
2491  * placed on the wire.
2492  *
2493  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2494  * The file will be opened again in the subsequent VFS open call
2495  * (nfs4_proc_file_open).
2496  *
2497  * The open for read will just hang around to be used by any process that
2498  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2499  */
2500
2501 static int
2502 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2503                  int flags, struct nfs_open_context *ctx)
2504 {
2505         struct path my_path = {
2506                 .dentry = dentry,
2507         };
2508         struct path *path = &my_path;
2509         struct nfs4_state *state;
2510         struct rpc_cred *cred = NULL;
2511         fmode_t fmode = 0;
2512         int status = 0;
2513
2514         if (ctx != NULL) {
2515                 cred = ctx->cred;
2516                 path = &ctx->path;
2517                 fmode = ctx->mode;
2518         }
2519         sattr->ia_mode &= ~current_umask();
2520         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2521         d_drop(dentry);
2522         if (IS_ERR(state)) {
2523                 status = PTR_ERR(state);
2524                 goto out;
2525         }
2526         d_add(dentry, igrab(state->inode));
2527         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2528         if (ctx != NULL)
2529                 ctx->state = state;
2530         else
2531                 nfs4_close_sync(path, state, fmode);
2532 out:
2533         return status;
2534 }
2535
2536 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2537 {
2538         struct nfs_server *server = NFS_SERVER(dir);
2539         struct nfs_removeargs args = {
2540                 .fh = NFS_FH(dir),
2541                 .name.len = name->len,
2542                 .name.name = name->name,
2543                 .bitmask = server->attr_bitmask,
2544         };
2545         struct nfs_removeres res = {
2546                 .server = server,
2547         };
2548         struct rpc_message msg = {
2549                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2550                 .rpc_argp = &args,
2551                 .rpc_resp = &res,
2552         };
2553         int status = -ENOMEM;
2554
2555         res.dir_attr = nfs_alloc_fattr();
2556         if (res.dir_attr == NULL)
2557                 goto out;
2558
2559         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2560         if (status == 0) {
2561                 update_changeattr(dir, &res.cinfo);
2562                 nfs_post_op_update_inode(dir, res.dir_attr);
2563         }
2564         nfs_free_fattr(res.dir_attr);
2565 out:
2566         return status;
2567 }
2568
2569 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2570 {
2571         struct nfs4_exception exception = { };
2572         int err;
2573         do {
2574                 err = nfs4_handle_exception(NFS_SERVER(dir),
2575                                 _nfs4_proc_remove(dir, name),
2576                                 &exception);
2577         } while (exception.retry);
2578         return err;
2579 }
2580
2581 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2582 {
2583         struct nfs_server *server = NFS_SERVER(dir);
2584         struct nfs_removeargs *args = msg->rpc_argp;
2585         struct nfs_removeres *res = msg->rpc_resp;
2586
2587         args->bitmask = server->cache_consistency_bitmask;
2588         res->server = server;
2589         res->seq_res.sr_slot = NULL;
2590         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2591 }
2592
2593 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2594 {
2595         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2596
2597         if (!nfs4_sequence_done(task, &res->seq_res))
2598                 return 0;
2599         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2600                 return 0;
2601         update_changeattr(dir, &res->cinfo);
2602         nfs_post_op_update_inode(dir, res->dir_attr);
2603         return 1;
2604 }
2605
2606 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2607 {
2608         struct nfs_server *server = NFS_SERVER(dir);
2609         struct nfs_renameargs *arg = msg->rpc_argp;
2610         struct nfs_renameres *res = msg->rpc_resp;
2611
2612         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2613         arg->bitmask = server->attr_bitmask;
2614         res->server = server;
2615 }
2616
2617 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2618                                  struct inode *new_dir)
2619 {
2620         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2621
2622         if (!nfs4_sequence_done(task, &res->seq_res))
2623                 return 0;
2624         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2625                 return 0;
2626
2627         update_changeattr(old_dir, &res->old_cinfo);
2628         nfs_post_op_update_inode(old_dir, res->old_fattr);
2629         update_changeattr(new_dir, &res->new_cinfo);
2630         nfs_post_op_update_inode(new_dir, res->new_fattr);
2631         return 1;
2632 }
2633
2634 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2635                 struct inode *new_dir, struct qstr *new_name)
2636 {
2637         struct nfs_server *server = NFS_SERVER(old_dir);
2638         struct nfs_renameargs arg = {
2639                 .old_dir = NFS_FH(old_dir),
2640                 .new_dir = NFS_FH(new_dir),
2641                 .old_name = old_name,
2642                 .new_name = new_name,
2643                 .bitmask = server->attr_bitmask,
2644         };
2645         struct nfs_renameres res = {
2646                 .server = server,
2647         };
2648         struct rpc_message msg = {
2649                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2650                 .rpc_argp = &arg,
2651                 .rpc_resp = &res,
2652         };
2653         int status = -ENOMEM;
2654
2655         res.old_fattr = nfs_alloc_fattr();
2656         res.new_fattr = nfs_alloc_fattr();
2657         if (res.old_fattr == NULL || res.new_fattr == NULL)
2658                 goto out;
2659
2660         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2661         if (!status) {
2662                 update_changeattr(old_dir, &res.old_cinfo);
2663                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2664                 update_changeattr(new_dir, &res.new_cinfo);
2665                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2666         }
2667 out:
2668         nfs_free_fattr(res.new_fattr);
2669         nfs_free_fattr(res.old_fattr);
2670         return status;
2671 }
2672
2673 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2674                 struct inode *new_dir, struct qstr *new_name)
2675 {
2676         struct nfs4_exception exception = { };
2677         int err;
2678         do {
2679                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2680                                 _nfs4_proc_rename(old_dir, old_name,
2681                                         new_dir, new_name),
2682                                 &exception);
2683         } while (exception.retry);
2684         return err;
2685 }
2686
2687 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2688 {
2689         struct nfs_server *server = NFS_SERVER(inode);
2690         struct nfs4_link_arg arg = {
2691                 .fh     = NFS_FH(inode),
2692                 .dir_fh = NFS_FH(dir),
2693                 .name   = name,
2694                 .bitmask = server->attr_bitmask,
2695         };
2696         struct nfs4_link_res res = {
2697                 .server = server,
2698         };
2699         struct rpc_message msg = {
2700                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2701                 .rpc_argp = &arg,
2702                 .rpc_resp = &res,
2703         };
2704         int status = -ENOMEM;
2705
2706         res.fattr = nfs_alloc_fattr();
2707         res.dir_attr = nfs_alloc_fattr();
2708         if (res.fattr == NULL || res.dir_attr == NULL)
2709                 goto out;
2710
2711         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2712         if (!status) {
2713                 update_changeattr(dir, &res.cinfo);
2714                 nfs_post_op_update_inode(dir, res.dir_attr);
2715                 nfs_post_op_update_inode(inode, res.fattr);
2716         }
2717 out:
2718         nfs_free_fattr(res.dir_attr);
2719         nfs_free_fattr(res.fattr);
2720         return status;
2721 }
2722
2723 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2724 {
2725         struct nfs4_exception exception = { };
2726         int err;
2727         do {
2728                 err = nfs4_handle_exception(NFS_SERVER(inode),
2729                                 _nfs4_proc_link(inode, dir, name),
2730                                 &exception);
2731         } while (exception.retry);
2732         return err;
2733 }
2734
2735 struct nfs4_createdata {
2736         struct rpc_message msg;
2737         struct nfs4_create_arg arg;
2738         struct nfs4_create_res res;
2739         struct nfs_fh fh;
2740         struct nfs_fattr fattr;
2741         struct nfs_fattr dir_fattr;
2742 };
2743
2744 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2745                 struct qstr *name, struct iattr *sattr, u32 ftype)
2746 {
2747         struct nfs4_createdata *data;
2748
2749         data = kzalloc(sizeof(*data), GFP_KERNEL);
2750         if (data != NULL) {
2751                 struct nfs_server *server = NFS_SERVER(dir);
2752
2753                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2754                 data->msg.rpc_argp = &data->arg;
2755                 data->msg.rpc_resp = &data->res;
2756                 data->arg.dir_fh = NFS_FH(dir);
2757                 data->arg.server = server;
2758                 data->arg.name = name;
2759                 data->arg.attrs = sattr;
2760                 data->arg.ftype = ftype;
2761                 data->arg.bitmask = server->attr_bitmask;
2762                 data->res.server = server;
2763                 data->res.fh = &data->fh;
2764                 data->res.fattr = &data->fattr;
2765                 data->res.dir_fattr = &data->dir_fattr;
2766                 nfs_fattr_init(data->res.fattr);
2767                 nfs_fattr_init(data->res.dir_fattr);
2768         }
2769         return data;
2770 }
2771
2772 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2773 {
2774         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2775                                     &data->arg, &data->res, 1);
2776         if (status == 0) {
2777                 update_changeattr(dir, &data->res.dir_cinfo);
2778                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2779                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2780         }
2781         return status;
2782 }
2783
2784 static void nfs4_free_createdata(struct nfs4_createdata *data)
2785 {
2786         kfree(data);
2787 }
2788
2789 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2790                 struct page *page, unsigned int len, struct iattr *sattr)
2791 {
2792         struct nfs4_createdata *data;
2793         int status = -ENAMETOOLONG;
2794
2795         if (len > NFS4_MAXPATHLEN)
2796                 goto out;
2797
2798         status = -ENOMEM;
2799         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2800         if (data == NULL)
2801                 goto out;
2802
2803         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2804         data->arg.u.symlink.pages = &page;
2805         data->arg.u.symlink.len = len;
2806
2807         status = nfs4_do_create(dir, dentry, data);
2808
2809         nfs4_free_createdata(data);
2810 out:
2811         return status;
2812 }
2813
2814 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2815                 struct page *page, unsigned int len, struct iattr *sattr)
2816 {
2817         struct nfs4_exception exception = { };
2818         int err;
2819         do {
2820                 err = nfs4_handle_exception(NFS_SERVER(dir),
2821                                 _nfs4_proc_symlink(dir, dentry, page,
2822                                                         len, sattr),
2823                                 &exception);
2824         } while (exception.retry);
2825         return err;
2826 }
2827
2828 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2829                 struct iattr *sattr)
2830 {
2831         struct nfs4_createdata *data;
2832         int status = -ENOMEM;
2833
2834         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2835         if (data == NULL)
2836                 goto out;
2837
2838         status = nfs4_do_create(dir, dentry, data);
2839
2840         nfs4_free_createdata(data);
2841 out:
2842         return status;
2843 }
2844
2845 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2846                 struct iattr *sattr)
2847 {
2848         struct nfs4_exception exception = { };
2849         int err;
2850
2851         sattr->ia_mode &= ~current_umask();
2852         do {
2853                 err = nfs4_handle_exception(NFS_SERVER(dir),
2854                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2855                                 &exception);
2856         } while (exception.retry);
2857         return err;
2858 }
2859
2860 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2861                 u64 cookie, struct page **pages, unsigned int count, int plus)
2862 {
2863         struct inode            *dir = dentry->d_inode;
2864         struct nfs4_readdir_arg args = {
2865                 .fh = NFS_FH(dir),
2866                 .pages = pages,
2867                 .pgbase = 0,
2868                 .count = count,
2869                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2870                 .plus = plus,
2871         };
2872         struct nfs4_readdir_res res;
2873         struct rpc_message msg = {
2874                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2875                 .rpc_argp = &args,
2876                 .rpc_resp = &res,
2877                 .rpc_cred = cred,
2878         };
2879         int                     status;
2880
2881         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2882                         dentry->d_parent->d_name.name,
2883                         dentry->d_name.name,
2884                         (unsigned long long)cookie);
2885         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2886         res.pgbase = args.pgbase;
2887         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2888         if (status >= 0) {
2889                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2890                 status += args.pgbase;
2891         }
2892
2893         nfs_invalidate_atime(dir);
2894
2895         dprintk("%s: returns %d\n", __func__, status);
2896         return status;
2897 }
2898
2899 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2900                 u64 cookie, struct page **pages, unsigned int count, int plus)
2901 {
2902         struct nfs4_exception exception = { };
2903         int err;
2904         do {
2905                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2906                                 _nfs4_proc_readdir(dentry, cred, cookie,
2907                                         pages, count, plus),
2908                                 &exception);
2909         } while (exception.retry);
2910         return err;
2911 }
2912
2913 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2914                 struct iattr *sattr, dev_t rdev)
2915 {
2916         struct nfs4_createdata *data;
2917         int mode = sattr->ia_mode;
2918         int status = -ENOMEM;
2919
2920         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2921         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2922
2923         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2924         if (data == NULL)
2925                 goto out;
2926
2927         if (S_ISFIFO(mode))
2928                 data->arg.ftype = NF4FIFO;
2929         else if (S_ISBLK(mode)) {
2930                 data->arg.ftype = NF4BLK;
2931                 data->arg.u.device.specdata1 = MAJOR(rdev);
2932                 data->arg.u.device.specdata2 = MINOR(rdev);
2933         }
2934         else if (S_ISCHR(mode)) {
2935                 data->arg.ftype = NF4CHR;
2936                 data->arg.u.device.specdata1 = MAJOR(rdev);
2937                 data->arg.u.device.specdata2 = MINOR(rdev);
2938         }
2939
2940         status = nfs4_do_create(dir, dentry, data);
2941
2942         nfs4_free_createdata(data);
2943 out:
2944         return status;
2945 }
2946
2947 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2948                 struct iattr *sattr, dev_t rdev)
2949 {
2950         struct nfs4_exception exception = { };
2951         int err;
2952
2953         sattr->ia_mode &= ~current_umask();
2954         do {
2955                 err = nfs4_handle_exception(NFS_SERVER(dir),
2956                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2957                                 &exception);
2958         } while (exception.retry);
2959         return err;
2960 }
2961
2962 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2963                  struct nfs_fsstat *fsstat)
2964 {
2965         struct nfs4_statfs_arg args = {
2966                 .fh = fhandle,
2967                 .bitmask = server->attr_bitmask,
2968         };
2969         struct nfs4_statfs_res res = {
2970                 .fsstat = fsstat,
2971         };
2972         struct rpc_message msg = {
2973                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2974                 .rpc_argp = &args,
2975                 .rpc_resp = &res,
2976         };
2977
2978         nfs_fattr_init(fsstat->fattr);
2979         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2980 }
2981
2982 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2983 {
2984         struct nfs4_exception exception = { };
2985         int err;
2986         do {
2987                 err = nfs4_handle_exception(server,
2988                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2989                                 &exception);
2990         } while (exception.retry);
2991         return err;
2992 }
2993
2994 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2995                 struct nfs_fsinfo *fsinfo)
2996 {
2997         struct nfs4_fsinfo_arg args = {
2998                 .fh = fhandle,
2999                 .bitmask = server->attr_bitmask,
3000         };
3001         struct nfs4_fsinfo_res res = {
3002                 .fsinfo = fsinfo,
3003         };
3004         struct rpc_message msg = {
3005                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3006                 .rpc_argp = &args,
3007                 .rpc_resp = &res,
3008         };
3009
3010         return nfs4_call_sync(server, &msg, &args, &res, 0);
3011 }
3012
3013 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3014 {
3015         struct nfs4_exception exception = { };
3016         int err;
3017
3018         do {
3019                 err = nfs4_handle_exception(server,
3020                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3021                                 &exception);
3022         } while (exception.retry);
3023         return err;
3024 }
3025
3026 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3027 {
3028         nfs_fattr_init(fsinfo->fattr);
3029         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3030 }
3031
3032 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3033                 struct nfs_pathconf *pathconf)
3034 {
3035         struct nfs4_pathconf_arg args = {
3036                 .fh = fhandle,
3037                 .bitmask = server->attr_bitmask,
3038         };
3039         struct nfs4_pathconf_res res = {
3040                 .pathconf = pathconf,
3041         };
3042         struct rpc_message msg = {
3043                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3044                 .rpc_argp = &args,
3045                 .rpc_resp = &res,
3046         };
3047
3048         /* None of the pathconf attributes are mandatory to implement */
3049         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3050                 memset(pathconf, 0, sizeof(*pathconf));
3051                 return 0;
3052         }
3053
3054         nfs_fattr_init(pathconf->fattr);
3055         return nfs4_call_sync(server, &msg, &args, &res, 0);
3056 }
3057
3058 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3059                 struct nfs_pathconf *pathconf)
3060 {
3061         struct nfs4_exception exception = { };
3062         int err;
3063
3064         do {
3065                 err = nfs4_handle_exception(server,
3066                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3067                                 &exception);
3068         } while (exception.retry);
3069         return err;
3070 }
3071
3072 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3073 {
3074         struct nfs_server *server = NFS_SERVER(data->inode);
3075
3076         dprintk("--> %s\n", __func__);
3077
3078         if (!nfs4_sequence_done(task, &data->res.seq_res))
3079                 return -EAGAIN;
3080
3081         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3082                 nfs_restart_rpc(task, server->nfs_client);
3083                 return -EAGAIN;
3084         }
3085
3086         nfs_invalidate_atime(data->inode);
3087         if (task->tk_status > 0)
3088                 renew_lease(server, data->timestamp);
3089         return 0;
3090 }
3091
3092 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3093 {
3094         data->timestamp   = jiffies;
3095         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3096 }
3097
3098 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3099 {
3100         struct inode *inode = data->inode;
3101
3102         if (!nfs4_sequence_done(task, &data->res.seq_res))
3103                 return -EAGAIN;
3104
3105         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3106                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3107                 return -EAGAIN;
3108         }
3109         if (task->tk_status >= 0) {
3110                 renew_lease(NFS_SERVER(inode), data->timestamp);
3111                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3112         }
3113         return 0;
3114 }
3115
3116 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3117 {
3118         struct nfs_server *server = NFS_SERVER(data->inode);
3119
3120         data->args.bitmask = server->cache_consistency_bitmask;
3121         data->res.server = server;
3122         data->timestamp   = jiffies;
3123
3124         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3125 }
3126
3127 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3128 {
3129         struct inode *inode = data->inode;
3130
3131         if (!nfs4_sequence_done(task, &data->res.seq_res))
3132                 return -EAGAIN;
3133
3134         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3135                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3136                 return -EAGAIN;
3137         }
3138         nfs_refresh_inode(inode, data->res.fattr);
3139         return 0;
3140 }
3141
3142 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3143 {
3144         struct nfs_server *server = NFS_SERVER(data->inode);
3145
3146         data->args.bitmask = server->cache_consistency_bitmask;
3147         data->res.server = server;
3148         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3149 }
3150
3151 struct nfs4_renewdata {
3152         struct nfs_client       *client;
3153         unsigned long           timestamp;
3154 };
3155
3156 /*
3157  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3158  * standalone procedure for queueing an asynchronous RENEW.
3159  */
3160 static void nfs4_renew_release(void *calldata)
3161 {
3162         struct nfs4_renewdata *data = calldata;
3163         struct nfs_client *clp = data->client;
3164
3165         if (atomic_read(&clp->cl_count) > 1)
3166                 nfs4_schedule_state_renewal(clp);
3167         nfs_put_client(clp);
3168         kfree(data);
3169 }
3170
3171 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3172 {
3173         struct nfs4_renewdata *data = calldata;
3174         struct nfs_client *clp = data->client;
3175         unsigned long timestamp = data->timestamp;
3176
3177         if (task->tk_status < 0) {
3178                 /* Unless we're shutting down, schedule state recovery! */
3179                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3180                         nfs4_schedule_state_recovery(clp);
3181                 return;
3182         }
3183         do_renew_lease(clp, timestamp);
3184 }
3185
3186 static const struct rpc_call_ops nfs4_renew_ops = {
3187         .rpc_call_done = nfs4_renew_done,
3188         .rpc_release = nfs4_renew_release,
3189 };
3190
3191 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3192 {
3193         struct rpc_message msg = {
3194                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3195                 .rpc_argp       = clp,
3196                 .rpc_cred       = cred,
3197         };
3198         struct nfs4_renewdata *data;
3199
3200         if (!atomic_inc_not_zero(&clp->cl_count))
3201                 return -EIO;
3202         data = kmalloc(sizeof(*data), GFP_KERNEL);
3203         if (data == NULL)
3204                 return -ENOMEM;
3205         data->client = clp;
3206         data->timestamp = jiffies;
3207         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3208                         &nfs4_renew_ops, data);
3209 }
3210
3211 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3212 {
3213         struct rpc_message msg = {
3214                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3215                 .rpc_argp       = clp,
3216                 .rpc_cred       = cred,
3217         };
3218         unsigned long now = jiffies;
3219         int status;
3220
3221         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3222         if (status < 0)
3223                 return status;
3224         do_renew_lease(clp, now);
3225         return 0;
3226 }
3227
3228 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3229 {
3230         return (server->caps & NFS_CAP_ACLS)
3231                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3232                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3233 }
3234
3235 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3236  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3237  * the stack.
3238  */
3239 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3240
3241 static void buf_to_pages(const void *buf, size_t buflen,
3242                 struct page **pages, unsigned int *pgbase)
3243 {
3244         const void *p = buf;
3245
3246         *pgbase = offset_in_page(buf);
3247         p -= *pgbase;
3248         while (p < buf + buflen) {
3249                 *(pages++) = virt_to_page(p);
3250                 p += PAGE_CACHE_SIZE;
3251         }
3252 }
3253
3254 struct nfs4_cached_acl {
3255         int cached;
3256         size_t len;
3257         char data[0];
3258 };
3259
3260 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3261 {
3262         struct nfs_inode *nfsi = NFS_I(inode);
3263
3264         spin_lock(&inode->i_lock);
3265         kfree(nfsi->nfs4_acl);
3266         nfsi->nfs4_acl = acl;
3267         spin_unlock(&inode->i_lock);
3268 }
3269
3270 static void nfs4_zap_acl_attr(struct inode *inode)
3271 {
3272         nfs4_set_cached_acl(inode, NULL);
3273 }
3274
3275 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3276 {
3277         struct nfs_inode *nfsi = NFS_I(inode);
3278         struct nfs4_cached_acl *acl;
3279         int ret = -ENOENT;
3280
3281         spin_lock(&inode->i_lock);
3282         acl = nfsi->nfs4_acl;
3283         if (acl == NULL)
3284                 goto out;
3285         if (buf == NULL) /* user is just asking for length */
3286                 goto out_len;
3287         if (acl->cached == 0)
3288                 goto out;
3289         ret = -ERANGE; /* see getxattr(2) man page */
3290         if (acl->len > buflen)
3291                 goto out;
3292         memcpy(buf, acl->data, acl->len);
3293 out_len:
3294         ret = acl->len;
3295 out:
3296         spin_unlock(&inode->i_lock);
3297         return ret;
3298 }
3299
3300 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3301 {
3302         struct nfs4_cached_acl *acl;
3303
3304         if (buf && acl_len <= PAGE_SIZE) {
3305                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3306                 if (acl == NULL)
3307                         goto out;
3308                 acl->cached = 1;
3309                 memcpy(acl->data, buf, acl_len);
3310         } else {
3311                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3312                 if (acl == NULL)
3313                         goto out;
3314                 acl->cached = 0;
3315         }
3316         acl->len = acl_len;
3317 out:
3318         nfs4_set_cached_acl(inode, acl);
3319 }
3320
3321 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3322 {
3323         struct page *pages[NFS4ACL_MAXPAGES];
3324         struct nfs_getaclargs args = {
3325                 .fh = NFS_FH(inode),
3326                 .acl_pages = pages,
3327                 .acl_len = buflen,
3328         };
3329         struct nfs_getaclres res = {
3330                 .acl_len = buflen,
3331         };
3332         void *resp_buf;
3333         struct rpc_message msg = {
3334                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3335                 .rpc_argp = &args,
3336                 .rpc_resp = &res,
3337         };
3338         struct page *localpage = NULL;
3339         int ret;
3340
3341         if (buflen < PAGE_SIZE) {
3342                 /* As long as we're doing a round trip to the server anyway,
3343                  * let's be prepared for a page of acl data. */
3344                 localpage = alloc_page(GFP_KERNEL);
3345                 resp_buf = page_address(localpage);
3346                 if (localpage == NULL)
3347                         return -ENOMEM;
3348                 args.acl_pages[0] = localpage;
3349                 args.acl_pgbase = 0;
3350                 args.acl_len = PAGE_SIZE;
3351         } else {
3352                 resp_buf = buf;
3353                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3354         }
3355         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3356         if (ret)
3357                 goto out_free;
3358         if (res.acl_len > args.acl_len)
3359                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3360         else
3361                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3362         if (buf) {
3363                 ret = -ERANGE;
3364                 if (res.acl_len > buflen)
3365                         goto out_free;
3366                 if (localpage)
3367                         memcpy(buf, resp_buf, res.acl_len);
3368         }
3369         ret = res.acl_len;
3370 out_free:
3371         if (localpage)
3372                 __free_page(localpage);
3373         return ret;
3374 }
3375
3376 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3377 {
3378         struct nfs4_exception exception = { };
3379         ssize_t ret;
3380         do {
3381                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3382                 if (ret >= 0)
3383                         break;
3384                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3385         } while (exception.retry);
3386         return ret;
3387 }
3388
3389 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3390 {
3391         struct nfs_server *server = NFS_SERVER(inode);
3392         int ret;
3393
3394         if (!nfs4_server_supports_acls(server))
3395                 return -EOPNOTSUPP;
3396         ret = nfs_revalidate_inode(server, inode);
3397         if (ret < 0)
3398                 return ret;
3399         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3400                 nfs_zap_acl_cache(inode);
3401         ret = nfs4_read_cached_acl(inode, buf, buflen);
3402         if (ret != -ENOENT)
3403                 return ret;
3404         return nfs4_get_acl_uncached(inode, buf, buflen);
3405 }
3406
3407 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3408 {
3409         struct nfs_server *server = NFS_SERVER(inode);
3410         struct page *pages[NFS4ACL_MAXPAGES];
3411         struct nfs_setaclargs arg = {
3412                 .fh             = NFS_FH(inode),
3413                 .acl_pages      = pages,
3414                 .acl_len        = buflen,
3415         };
3416         struct nfs_setaclres res;
3417         struct rpc_message msg = {
3418                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3419                 .rpc_argp       = &arg,
3420                 .rpc_resp       = &res,
3421         };
3422         int ret;
3423
3424         if (!nfs4_server_supports_acls(server))
3425                 return -EOPNOTSUPP;
3426         nfs_inode_return_delegation(inode);
3427         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3428         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3429         /*
3430          * Acl update can result in inode attribute update.
3431          * so mark the attribute cache invalid.
3432          */
3433         spin_lock(&inode->i_lock);
3434         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3435         spin_unlock(&inode->i_lock);
3436         nfs_access_zap_cache(inode);
3437         nfs_zap_acl_cache(inode);
3438         return ret;
3439 }
3440
3441 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3442 {
3443         struct nfs4_exception exception = { };
3444         int err;
3445         do {
3446                 err = nfs4_handle_exception(NFS_SERVER(inode),
3447                                 __nfs4_proc_set_acl(inode, buf, buflen),
3448                                 &exception);
3449         } while (exception.retry);
3450         return err;
3451 }
3452
3453 static int
3454 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3455 {
3456         struct nfs_client *clp = server->nfs_client;
3457
3458         if (task->tk_status >= 0)
3459                 return 0;
3460         switch(task->tk_status) {
3461                 case -NFS4ERR_ADMIN_REVOKED:
3462                 case -NFS4ERR_BAD_STATEID:
3463                 case -NFS4ERR_OPENMODE:
3464                         if (state == NULL)
3465                                 break;
3466                         nfs4_state_mark_reclaim_nograce(clp, state);
3467                         goto do_state_recovery;
3468                 case -NFS4ERR_STALE_STATEID:
3469                 case -NFS4ERR_STALE_CLIENTID:
3470                 case -NFS4ERR_EXPIRED:
3471                         goto do_state_recovery;
3472 #if defined(CONFIG_NFS_V4_1)
3473                 case -NFS4ERR_BADSESSION:
3474                 case -NFS4ERR_BADSLOT:
3475                 case -NFS4ERR_BAD_HIGH_SLOT:
3476                 case -NFS4ERR_DEADSESSION:
3477                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3478                 case -NFS4ERR_SEQ_FALSE_RETRY:
3479                 case -NFS4ERR_SEQ_MISORDERED:
3480                         dprintk("%s ERROR %d, Reset session\n", __func__,
3481                                 task->tk_status);
3482                         nfs4_schedule_state_recovery(clp);
3483                         task->tk_status = 0;
3484                         return -EAGAIN;
3485 #endif /* CONFIG_NFS_V4_1 */
3486                 case -NFS4ERR_DELAY:
3487                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3488                 case -NFS4ERR_GRACE:
3489                 case -EKEYEXPIRED:
3490                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3491                         task->tk_status = 0;
3492                         return -EAGAIN;
3493                 case -NFS4ERR_OLD_STATEID:
3494                         task->tk_status = 0;
3495                         return -EAGAIN;
3496         }
3497         task->tk_status = nfs4_map_errors(task->tk_status);
3498         return 0;
3499 do_state_recovery:
3500         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3501         nfs4_schedule_state_recovery(clp);
3502         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3503                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3504         task->tk_status = 0;
3505         return -EAGAIN;
3506 }
3507
3508 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3509                 unsigned short port, struct rpc_cred *cred,
3510                 struct nfs4_setclientid_res *res)
3511 {
3512         nfs4_verifier sc_verifier;
3513         struct nfs4_setclientid setclientid = {
3514                 .sc_verifier = &sc_verifier,
3515                 .sc_prog = program,
3516                 .sc_cb_ident = clp->cl_cb_ident,
3517         };
3518         struct rpc_message msg = {
3519                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3520                 .rpc_argp = &setclientid,
3521                 .rpc_resp = res,
3522                 .rpc_cred = cred,
3523         };
3524         __be32 *p;
3525         int loop = 0;
3526         int status;
3527
3528         p = (__be32*)sc_verifier.data;
3529         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3530         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3531
3532         for(;;) {
3533                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3534                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3535                                 clp->cl_ipaddr,
3536                                 rpc_peeraddr2str(clp->cl_rpcclient,
3537                                                         RPC_DISPLAY_ADDR),
3538                                 rpc_peeraddr2str(clp->cl_rpcclient,
3539                                                         RPC_DISPLAY_PROTO),
3540                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3541                                 clp->cl_id_uniquifier);
3542                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3543                                 sizeof(setclientid.sc_netid),
3544                                 rpc_peeraddr2str(clp->cl_rpcclient,
3545                                                         RPC_DISPLAY_NETID));
3546                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3547                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3548                                 clp->cl_ipaddr, port >> 8, port & 255);
3549
3550                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3551                 if (status != -NFS4ERR_CLID_INUSE)
3552                         break;
3553                 if (signalled())
3554                         break;
3555                 if (loop++ & 1)
3556                         ssleep(clp->cl_lease_time / HZ + 1);
3557                 else
3558                         if (++clp->cl_id_uniquifier == 0)
3559                                 break;
3560         }
3561         return status;
3562 }
3563
3564 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3565                 struct nfs4_setclientid_res *arg,
3566                 struct rpc_cred *cred)
3567 {
3568         struct nfs_fsinfo fsinfo;
3569         struct rpc_message msg = {
3570                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3571                 .rpc_argp = arg,
3572                 .rpc_resp = &fsinfo,
3573                 .rpc_cred = cred,
3574         };
3575         unsigned long now;
3576         int status;
3577
3578         now = jiffies;
3579         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3580         if (status == 0) {
3581                 spin_lock(&clp->cl_lock);
3582                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3583                 clp->cl_last_renewal = now;
3584                 spin_unlock(&clp->cl_lock);
3585         }
3586         return status;
3587 }
3588
3589 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3590                 struct nfs4_setclientid_res *arg,
3591                 struct rpc_cred *cred)
3592 {
3593         long timeout = 0;
3594         int err;
3595         do {
3596                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3597                 switch (err) {
3598                         case 0:
3599                                 return err;
3600                         case -NFS4ERR_RESOURCE:
3601                                 /* The IBM lawyers misread another document! */
3602                         case -NFS4ERR_DELAY:
3603                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3604                 }
3605         } while (err == 0);
3606         return err;
3607 }
3608
3609 struct nfs4_delegreturndata {
3610         struct nfs4_delegreturnargs args;
3611         struct nfs4_delegreturnres res;
3612         struct nfs_fh fh;
3613         nfs4_stateid stateid;
3614         unsigned long timestamp;
3615         struct nfs_fattr fattr;
3616         int rpc_status;
3617 };
3618
3619 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3620 {
3621         struct nfs4_delegreturndata *data = calldata;
3622
3623         if (!nfs4_sequence_done(task, &data->res.seq_res))
3624                 return;
3625
3626         switch (task->tk_status) {
3627         case -NFS4ERR_STALE_STATEID:
3628         case -NFS4ERR_EXPIRED:
3629         case 0:
3630                 renew_lease(data->res.server, data->timestamp);
3631                 break;
3632         default:
3633                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3634                                 -EAGAIN) {
3635                         nfs_restart_rpc(task, data->res.server->nfs_client);
3636                         return;
3637                 }
3638         }
3639         data->rpc_status = task->tk_status;
3640 }
3641
3642 static void nfs4_delegreturn_release(void *calldata)
3643 {
3644         kfree(calldata);
3645 }
3646
3647 #if defined(CONFIG_NFS_V4_1)
3648 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3649 {
3650         struct nfs4_delegreturndata *d_data;
3651
3652         d_data = (struct nfs4_delegreturndata *)data;
3653
3654         if (nfs4_setup_sequence(d_data->res.server,
3655                                 &d_data->args.seq_args,
3656                                 &d_data->res.seq_res, 1, task))
3657                 return;
3658         rpc_call_start(task);
3659 }
3660 #endif /* CONFIG_NFS_V4_1 */
3661
3662 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3663 #if defined(CONFIG_NFS_V4_1)
3664         .rpc_call_prepare = nfs4_delegreturn_prepare,
3665 #endif /* CONFIG_NFS_V4_1 */
3666         .rpc_call_done = nfs4_delegreturn_done,
3667         .rpc_release = nfs4_delegreturn_release,
3668 };
3669
3670 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3671 {
3672         struct nfs4_delegreturndata *data;
3673         struct nfs_server *server = NFS_SERVER(inode);
3674         struct rpc_task *task;
3675         struct rpc_message msg = {
3676                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3677                 .rpc_cred = cred,
3678         };
3679         struct rpc_task_setup task_setup_data = {
3680                 .rpc_client = server->client,
3681                 .rpc_message = &msg,
3682                 .callback_ops = &nfs4_delegreturn_ops,
3683                 .flags = RPC_TASK_ASYNC,
3684         };
3685         int status = 0;
3686
3687         data = kzalloc(sizeof(*data), GFP_NOFS);
3688         if (data == NULL)
3689                 return -ENOMEM;
3690         data->args.fhandle = &data->fh;
3691         data->args.stateid = &data->stateid;
3692         data->args.bitmask = server->attr_bitmask;
3693         nfs_copy_fh(&data->fh, NFS_FH(inode));
3694         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3695         data->res.fattr = &data->fattr;
3696         data->res.server = server;
3697         nfs_fattr_init(data->res.fattr);
3698         data->timestamp = jiffies;
3699         data->rpc_status = 0;
3700
3701         task_setup_data.callback_data = data;
3702         msg.rpc_argp = &data->args;
3703         msg.rpc_resp = &data->res;
3704         task = rpc_run_task(&task_setup_data);
3705         if (IS_ERR(task))
3706                 return PTR_ERR(task);
3707         if (!issync)
3708                 goto out;
3709         status = nfs4_wait_for_completion_rpc_task(task);
3710         if (status != 0)
3711                 goto out;
3712         status = data->rpc_status;
3713         if (status != 0)
3714                 goto out;
3715         nfs_refresh_inode(inode, &data->fattr);
3716 out:
3717         rpc_put_task(task);
3718         return status;
3719 }
3720
3721 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3722 {
3723         struct nfs_server *server = NFS_SERVER(inode);
3724         struct nfs4_exception exception = { };
3725         int err;
3726         do {
3727                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3728                 switch (err) {
3729                         case -NFS4ERR_STALE_STATEID:
3730                         case -NFS4ERR_EXPIRED:
3731                         case 0:
3732                                 return 0;
3733                 }
3734                 err = nfs4_handle_exception(server, err, &exception);
3735         } while (exception.retry);
3736         return err;
3737 }
3738
3739 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3740 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3741
3742 /*
3743  * sleep, with exponential backoff, and retry the LOCK operation.
3744  */
3745 static unsigned long
3746 nfs4_set_lock_task_retry(unsigned long timeout)
3747 {
3748         schedule_timeout_killable(timeout);
3749         timeout <<= 1;
3750         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3751                 return NFS4_LOCK_MAXTIMEOUT;
3752         return timeout;
3753 }
3754
3755 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3756 {
3757         struct inode *inode = state->inode;
3758         struct nfs_server *server = NFS_SERVER(inode);
3759         struct nfs_client *clp = server->nfs_client;
3760         struct nfs_lockt_args arg = {
3761                 .fh = NFS_FH(inode),
3762                 .fl = request,
3763         };
3764         struct nfs_lockt_res res = {
3765                 .denied = request,
3766         };
3767         struct rpc_message msg = {
3768                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3769                 .rpc_argp       = &arg,
3770                 .rpc_resp       = &res,
3771                 .rpc_cred       = state->owner->so_cred,
3772         };
3773         struct nfs4_lock_state *lsp;
3774         int status;
3775
3776         arg.lock_owner.clientid = clp->cl_clientid;
3777         status = nfs4_set_lock_state(state, request);
3778         if (status != 0)
3779                 goto out;
3780         lsp = request->fl_u.nfs4_fl.owner;
3781         arg.lock_owner.id = lsp->ls_id.id;
3782         arg.lock_owner.s_dev = server->s_dev;
3783         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3784         switch (status) {
3785                 case 0:
3786                         request->fl_type = F_UNLCK;
3787                         break;
3788                 case -NFS4ERR_DENIED:
3789                         status = 0;
3790         }
3791         request->fl_ops->fl_release_private(request);
3792 out:
3793         return status;
3794 }
3795
3796 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3797 {
3798         struct nfs4_exception exception = { };
3799         int err;
3800
3801         do {
3802                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3803                                 _nfs4_proc_getlk(state, cmd, request),
3804                                 &exception);
3805         } while (exception.retry);
3806         return err;
3807 }
3808
3809 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3810 {
3811         int res = 0;
3812         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3813                 case FL_POSIX:
3814                         res = posix_lock_file_wait(file, fl);
3815                         break;
3816                 case FL_FLOCK:
3817                         res = flock_lock_file_wait(file, fl);
3818                         break;
3819                 default:
3820                         BUG();
3821         }
3822         return res;
3823 }
3824
3825 struct nfs4_unlockdata {
3826         struct nfs_locku_args arg;
3827         struct nfs_locku_res res;
3828         struct nfs4_lock_state *lsp;
3829         struct nfs_open_context *ctx;
3830         struct file_lock fl;
3831         const struct nfs_server *server;
3832         unsigned long timestamp;
3833 };
3834
3835 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3836                 struct nfs_open_context *ctx,
3837                 struct nfs4_lock_state *lsp,
3838                 struct nfs_seqid *seqid)
3839 {
3840         struct nfs4_unlockdata *p;
3841         struct inode *inode = lsp->ls_state->inode;
3842
3843         p = kzalloc(sizeof(*p), GFP_NOFS);
3844         if (p == NULL)
3845                 return NULL;
3846         p->arg.fh = NFS_FH(inode);
3847         p->arg.fl = &p->fl;
3848         p->arg.seqid = seqid;
3849         p->res.seqid = seqid;
3850         p->arg.stateid = &lsp->ls_stateid;
3851         p->lsp = lsp;
3852         atomic_inc(&lsp->ls_count);
3853         /* Ensure we don't close file until we're done freeing locks! */
3854         p->ctx = get_nfs_open_context(ctx);
3855         memcpy(&p->fl, fl, sizeof(p->fl));
3856         p->server = NFS_SERVER(inode);
3857         return p;
3858 }
3859
3860 static void nfs4_locku_release_calldata(void *data)
3861 {
3862         struct nfs4_unlockdata *calldata = data;
3863         nfs_free_seqid(calldata->arg.seqid);
3864         nfs4_put_lock_state(calldata->lsp);
3865         put_nfs_open_context(calldata->ctx);
3866         kfree(calldata);
3867 }
3868
3869 static void nfs4_locku_done(struct rpc_task *task, void *data)
3870 {
3871         struct nfs4_unlockdata *calldata = data;
3872
3873         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3874                 return;
3875         switch (task->tk_status) {
3876                 case 0:
3877                         memcpy(calldata->lsp->ls_stateid.data,
3878                                         calldata->res.stateid.data,
3879                                         sizeof(calldata->lsp->ls_stateid.data));
3880                         renew_lease(calldata->server, calldata->timestamp);
3881                         break;
3882                 case -NFS4ERR_BAD_STATEID:
3883                 case -NFS4ERR_OLD_STATEID:
3884                 case -NFS4ERR_STALE_STATEID:
3885                 case -NFS4ERR_EXPIRED:
3886                         break;
3887                 default:
3888                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3889                                 nfs_restart_rpc(task,
3890                                                  calldata->server->nfs_client);
3891         }
3892 }
3893
3894 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3895 {
3896         struct nfs4_unlockdata *calldata = data;
3897
3898         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3899                 return;
3900         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3901                 /* Note: exit _without_ running nfs4_locku_done */
3902                 task->tk_action = NULL;
3903                 return;
3904         }
3905         calldata->timestamp = jiffies;
3906         if (nfs4_setup_sequence(calldata->server,
3907                                 &calldata->arg.seq_args,
3908                                 &calldata->res.seq_res, 1, task))
3909                 return;
3910         rpc_call_start(task);
3911 }
3912
3913 static const struct rpc_call_ops nfs4_locku_ops = {
3914         .rpc_call_prepare = nfs4_locku_prepare,
3915         .rpc_call_done = nfs4_locku_done,
3916         .rpc_release = nfs4_locku_release_calldata,
3917 };
3918
3919 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3920                 struct nfs_open_context *ctx,
3921                 struct nfs4_lock_state *lsp,
3922                 struct nfs_seqid *seqid)
3923 {
3924         struct nfs4_unlockdata *data;
3925         struct rpc_message msg = {
3926                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3927                 .rpc_cred = ctx->cred,
3928         };
3929         struct rpc_task_setup task_setup_data = {
3930                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3931                 .rpc_message = &msg,
3932                 .callback_ops = &nfs4_locku_ops,
3933                 .workqueue = nfsiod_workqueue,
3934                 .flags = RPC_TASK_ASYNC,
3935         };
3936
3937         /* Ensure this is an unlock - when canceling a lock, the
3938          * canceled lock is passed in, and it won't be an unlock.
3939          */
3940         fl->fl_type = F_UNLCK;
3941
3942         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3943         if (data == NULL) {
3944                 nfs_free_seqid(seqid);
3945                 return ERR_PTR(-ENOMEM);
3946         }
3947
3948         msg.rpc_argp = &data->arg;
3949         msg.rpc_resp = &data->res;
3950         task_setup_data.callback_data = data;
3951         return rpc_run_task(&task_setup_data);
3952 }
3953
3954 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3955 {
3956         struct nfs_inode *nfsi = NFS_I(state->inode);
3957         struct nfs_seqid *seqid;
3958         struct nfs4_lock_state *lsp;
3959         struct rpc_task *task;
3960         int status = 0;
3961         unsigned char fl_flags = request->fl_flags;
3962
3963         status = nfs4_set_lock_state(state, request);
3964         /* Unlock _before_ we do the RPC call */
3965         request->fl_flags |= FL_EXISTS;
3966         down_read(&nfsi->rwsem);
3967         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3968                 up_read(&nfsi->rwsem);
3969                 goto out;
3970         }
3971         up_read(&nfsi->rwsem);
3972         if (status != 0)
3973                 goto out;
3974         /* Is this a delegated lock? */
3975         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3976                 goto out;
3977         lsp = request->fl_u.nfs4_fl.owner;
3978         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
3979         status = -ENOMEM;
3980         if (seqid == NULL)
3981                 goto out;
3982         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3983         status = PTR_ERR(task);
3984         if (IS_ERR(task))
3985                 goto out;
3986         status = nfs4_wait_for_completion_rpc_task(task);
3987         rpc_put_task(task);
3988 out:
3989         request->fl_flags = fl_flags;
3990         return status;
3991 }
3992
3993 struct nfs4_lockdata {
3994         struct nfs_lock_args arg;
3995         struct nfs_lock_res res;
3996         struct nfs4_lock_state *lsp;
3997         struct nfs_open_context *ctx;
3998         struct file_lock fl;
3999         unsigned long timestamp;
4000         int rpc_status;
4001         int cancelled;
4002         struct nfs_server *server;
4003 };
4004
4005 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4006                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4007                 gfp_t gfp_mask)
4008 {
4009         struct nfs4_lockdata *p;
4010         struct inode *inode = lsp->ls_state->inode;
4011         struct nfs_server *server = NFS_SERVER(inode);
4012
4013         p = kzalloc(sizeof(*p), gfp_mask);
4014         if (p == NULL)
4015                 return NULL;
4016
4017         p->arg.fh = NFS_FH(inode);
4018         p->arg.fl = &p->fl;
4019         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4020         if (p->arg.open_seqid == NULL)
4021                 goto out_free;
4022         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4023         if (p->arg.lock_seqid == NULL)
4024                 goto out_free_seqid;
4025         p->arg.lock_stateid = &lsp->ls_stateid;
4026         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4027         p->arg.lock_owner.id = lsp->ls_id.id;
4028         p->arg.lock_owner.s_dev = server->s_dev;
4029         p->res.lock_seqid = p->arg.lock_seqid;
4030         p->lsp = lsp;
4031         p->server = server;
4032         atomic_inc(&lsp->ls_count);
4033         p->ctx = get_nfs_open_context(ctx);
4034         memcpy(&p->fl, fl, sizeof(p->fl));
4035         return p;
4036 out_free_seqid:
4037         nfs_free_seqid(p->arg.open_seqid);
4038 out_free:
4039         kfree(p);
4040         return NULL;
4041 }
4042
4043 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4044 {
4045         struct nfs4_lockdata *data = calldata;
4046         struct nfs4_state *state = data->lsp->ls_state;
4047
4048         dprintk("%s: begin!\n", __func__);
4049         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4050                 return;
4051         /* Do we need to do an open_to_lock_owner? */
4052         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4053                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4054                         return;
4055                 data->arg.open_stateid = &state->stateid;
4056                 data->arg.new_lock_owner = 1;
4057                 data->res.open_seqid = data->arg.open_seqid;
4058         } else
4059                 data->arg.new_lock_owner = 0;
4060         data->timestamp = jiffies;
4061         if (nfs4_setup_sequence(data->server,
4062                                 &data->arg.seq_args,
4063                                 &data->res.seq_res, 1, task))
4064                 return;
4065         rpc_call_start(task);
4066         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4067 }
4068
4069 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4070 {
4071         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4072         nfs4_lock_prepare(task, calldata);
4073 }
4074
4075 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4076 {
4077         struct nfs4_lockdata *data = calldata;
4078
4079         dprintk("%s: begin!\n", __func__);
4080
4081         if (!nfs4_sequence_done(task, &data->res.seq_res))
4082                 return;
4083
4084         data->rpc_status = task->tk_status;
4085         if (data->arg.new_lock_owner != 0) {
4086                 if (data->rpc_status == 0)
4087                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4088                 else
4089                         goto out;
4090         }
4091         if (data->rpc_status == 0) {
4092                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4093                                         sizeof(data->lsp->ls_stateid.data));
4094                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4095                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4096         }
4097 out:
4098         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4099 }
4100
4101 static void nfs4_lock_release(void *calldata)
4102 {
4103         struct nfs4_lockdata *data = calldata;
4104
4105         dprintk("%s: begin!\n", __func__);
4106         nfs_free_seqid(data->arg.open_seqid);
4107         if (data->cancelled != 0) {
4108                 struct rpc_task *task;
4109                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4110                                 data->arg.lock_seqid);
4111                 if (!IS_ERR(task))
4112                         rpc_put_task(task);
4113                 dprintk("%s: cancelling lock!\n", __func__);
4114         } else
4115                 nfs_free_seqid(data->arg.lock_seqid);
4116         nfs4_put_lock_state(data->lsp);
4117         put_nfs_open_context(data->ctx);
4118         kfree(data);
4119         dprintk("%s: done!\n", __func__);
4120 }
4121
4122 static const struct rpc_call_ops nfs4_lock_ops = {
4123         .rpc_call_prepare = nfs4_lock_prepare,
4124         .rpc_call_done = nfs4_lock_done,
4125         .rpc_release = nfs4_lock_release,
4126 };
4127
4128 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4129         .rpc_call_prepare = nfs4_recover_lock_prepare,
4130         .rpc_call_done = nfs4_lock_done,
4131         .rpc_release = nfs4_lock_release,
4132 };
4133
4134 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4135 {
4136         struct nfs_client *clp = server->nfs_client;
4137         struct nfs4_state *state = lsp->ls_state;
4138
4139         switch (error) {
4140         case -NFS4ERR_ADMIN_REVOKED:
4141         case -NFS4ERR_BAD_STATEID:
4142         case -NFS4ERR_EXPIRED:
4143                 if (new_lock_owner != 0 ||
4144                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4145                         nfs4_state_mark_reclaim_nograce(clp, state);
4146                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4147                 break;
4148         case -NFS4ERR_STALE_STATEID:
4149                 if (new_lock_owner != 0 ||
4150                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4151                         nfs4_state_mark_reclaim_reboot(clp, state);
4152                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4153         };
4154 }
4155
4156 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4157 {
4158         struct nfs4_lockdata *data;
4159         struct rpc_task *task;
4160         struct rpc_message msg = {
4161                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4162                 .rpc_cred = state->owner->so_cred,
4163         };
4164         struct rpc_task_setup task_setup_data = {
4165                 .rpc_client = NFS_CLIENT(state->inode),
4166                 .rpc_message = &msg,
4167                 .callback_ops = &nfs4_lock_ops,
4168                 .workqueue = nfsiod_workqueue,
4169                 .flags = RPC_TASK_ASYNC,
4170         };
4171         int ret;
4172
4173         dprintk("%s: begin!\n", __func__);
4174         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4175                         fl->fl_u.nfs4_fl.owner,
4176                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4177         if (data == NULL)
4178                 return -ENOMEM;
4179         if (IS_SETLKW(cmd))
4180                 data->arg.block = 1;
4181         if (recovery_type > NFS_LOCK_NEW) {
4182                 if (recovery_type == NFS_LOCK_RECLAIM)
4183                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4184                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4185         }
4186         msg.rpc_argp = &data->arg;
4187         msg.rpc_resp = &data->res;
4188         task_setup_data.callback_data = data;
4189         task = rpc_run_task(&task_setup_data);
4190         if (IS_ERR(task))
4191                 return PTR_ERR(task);
4192         ret = nfs4_wait_for_completion_rpc_task(task);
4193         if (ret == 0) {
4194                 ret = data->rpc_status;
4195                 if (ret)
4196                         nfs4_handle_setlk_error(data->server, data->lsp,
4197                                         data->arg.new_lock_owner, ret);
4198         } else
4199                 data->cancelled = 1;
4200         rpc_put_task(task);
4201         dprintk("%s: done, ret = %d!\n", __func__, ret);
4202         return ret;
4203 }
4204
4205 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4206 {
4207         struct nfs_server *server = NFS_SERVER(state->inode);
4208         struct nfs4_exception exception = { };
4209         int err;
4210
4211         do {
4212                 /* Cache the lock if possible... */
4213                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4214                         return 0;
4215                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4216                 if (err != -NFS4ERR_DELAY)
4217                         break;
4218                 nfs4_handle_exception(server, err, &exception);
4219         } while (exception.retry);
4220         return err;
4221 }
4222
4223 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4224 {
4225         struct nfs_server *server = NFS_SERVER(state->inode);
4226         struct nfs4_exception exception = { };
4227         int err;
4228
4229         err = nfs4_set_lock_state(state, request);
4230         if (err != 0)
4231                 return err;
4232         do {
4233                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4234                         return 0;
4235                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4236                 switch (err) {
4237                 default:
4238                         goto out;
4239                 case -NFS4ERR_GRACE:
4240                 case -NFS4ERR_DELAY:
4241                         nfs4_handle_exception(server, err, &exception);
4242                         err = 0;
4243                 }
4244         } while (exception.retry);
4245 out:
4246         return err;
4247 }
4248
4249 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4250 {
4251         struct nfs_inode *nfsi = NFS_I(state->inode);
4252         unsigned char fl_flags = request->fl_flags;
4253         int status = -ENOLCK;
4254
4255         if ((fl_flags & FL_POSIX) &&
4256                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4257                 goto out;
4258         /* Is this a delegated open? */
4259         status = nfs4_set_lock_state(state, request);
4260         if (status != 0)
4261                 goto out;
4262         request->fl_flags |= FL_ACCESS;
4263         status = do_vfs_lock(request->fl_file, request);
4264         if (status < 0)
4265                 goto out;
4266         down_read(&nfsi->rwsem);
4267         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4268                 /* Yes: cache locks! */
4269                 /* ...but avoid races with delegation recall... */
4270                 request->fl_flags = fl_flags & ~FL_SLEEP;
4271                 status = do_vfs_lock(request->fl_file, request);
4272                 goto out_unlock;
4273         }
4274         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4275         if (status != 0)
4276                 goto out_unlock;
4277         /* Note: we always want to sleep here! */
4278         request->fl_flags = fl_flags | FL_SLEEP;
4279         if (do_vfs_lock(request->fl_file, request) < 0)
4280                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4281 out_unlock:
4282         up_read(&nfsi->rwsem);
4283 out:
4284         request->fl_flags = fl_flags;
4285         return status;
4286 }
4287
4288 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4289 {
4290         struct nfs4_exception exception = { };
4291         int err;
4292
4293         do {
4294                 err = _nfs4_proc_setlk(state, cmd, request);
4295                 if (err == -NFS4ERR_DENIED)
4296                         err = -EAGAIN;
4297                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4298                                 err, &exception);
4299         } while (exception.retry);
4300         return err;
4301 }
4302
4303 static int
4304 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4305 {
4306         struct nfs_open_context *ctx;
4307         struct nfs4_state *state;
4308         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4309         int status;
4310
4311         /* verify open state */
4312         ctx = nfs_file_open_context(filp);
4313         state = ctx->state;
4314
4315         if (request->fl_start < 0 || request->fl_end < 0)
4316                 return -EINVAL;
4317
4318         if (IS_GETLK(cmd)) {
4319                 if (state != NULL)
4320                         return nfs4_proc_getlk(state, F_GETLK, request);
4321                 return 0;
4322         }
4323
4324         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4325                 return -EINVAL;
4326
4327         if (request->fl_type == F_UNLCK) {
4328                 if (state != NULL)
4329                         return nfs4_proc_unlck(state, cmd, request);
4330                 return 0;
4331         }
4332
4333         if (state == NULL)
4334                 return -ENOLCK;
4335         do {
4336                 status = nfs4_proc_setlk(state, cmd, request);
4337                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4338                         break;
4339                 timeout = nfs4_set_lock_task_retry(timeout);
4340                 status = -ERESTARTSYS;
4341                 if (signalled())
4342                         break;
4343         } while(status < 0);
4344         return status;
4345 }
4346
4347 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4348 {
4349         struct nfs_server *server = NFS_SERVER(state->inode);
4350         struct nfs4_exception exception = { };
4351         int err;
4352
4353         err = nfs4_set_lock_state(state, fl);
4354         if (err != 0)
4355                 goto out;
4356         do {
4357                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4358                 switch (err) {
4359                         default:
4360                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4361                                                 __func__, err);
4362                         case 0:
4363                         case -ESTALE:
4364                                 goto out;
4365                         case -NFS4ERR_EXPIRED:
4366                         case -NFS4ERR_STALE_CLIENTID:
4367                         case -NFS4ERR_STALE_STATEID:
4368                         case -NFS4ERR_BADSESSION:
4369                         case -NFS4ERR_BADSLOT:
4370                         case -NFS4ERR_BAD_HIGH_SLOT:
4371                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4372                         case -NFS4ERR_DEADSESSION:
4373                                 nfs4_schedule_state_recovery(server->nfs_client);
4374                                 goto out;
4375                         case -ERESTARTSYS:
4376                                 /*
4377                                  * The show must go on: exit, but mark the
4378                                  * stateid as needing recovery.
4379                                  */
4380                         case -NFS4ERR_ADMIN_REVOKED:
4381                         case -NFS4ERR_BAD_STATEID:
4382                         case -NFS4ERR_OPENMODE:
4383                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4384                                 err = 0;
4385                                 goto out;
4386                         case -EKEYEXPIRED:
4387                                 /*
4388                                  * User RPCSEC_GSS context has expired.
4389                                  * We cannot recover this stateid now, so
4390                                  * skip it and allow recovery thread to
4391                                  * proceed.
4392                                  */
4393                                 err = 0;
4394                                 goto out;
4395                         case -ENOMEM:
4396                         case -NFS4ERR_DENIED:
4397                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4398                                 err = 0;
4399                                 goto out;
4400                         case -NFS4ERR_DELAY:
4401                                 break;
4402                 }
4403                 err = nfs4_handle_exception(server, err, &exception);
4404         } while (exception.retry);
4405 out:
4406         return err;
4407 }
4408
4409 static void nfs4_release_lockowner_release(void *calldata)
4410 {
4411         kfree(calldata);
4412 }
4413
4414 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4415         .rpc_release = nfs4_release_lockowner_release,
4416 };
4417
4418 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4419 {
4420         struct nfs_server *server = lsp->ls_state->owner->so_server;
4421         struct nfs_release_lockowner_args *args;
4422         struct rpc_message msg = {
4423                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4424         };
4425
4426         if (server->nfs_client->cl_mvops->minor_version != 0)
4427                 return;
4428         args = kmalloc(sizeof(*args), GFP_NOFS);
4429         if (!args)
4430                 return;
4431         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4432         args->lock_owner.id = lsp->ls_id.id;
4433         args->lock_owner.s_dev = server->s_dev;
4434         msg.rpc_argp = args;
4435         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4436 }
4437
4438 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4439
4440 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4441                                    const void *buf, size_t buflen,
4442                                    int flags, int type)
4443 {
4444         if (strcmp(key, "") != 0)
4445                 return -EINVAL;
4446
4447         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4448 }
4449
4450 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4451                                    void *buf, size_t buflen, int type)
4452 {
4453         if (strcmp(key, "") != 0)
4454                 return -EINVAL;
4455
4456         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4457 }
4458
4459 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4460                                        size_t list_len, const char *name,
4461                                        size_t name_len, int type)
4462 {
4463         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4464
4465         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4466                 return 0;
4467
4468         if (list && len <= list_len)
4469                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4470         return len;
4471 }
4472
4473 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4474 {
4475         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4476                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4477                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4478                 return;
4479
4480         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4481                 NFS_ATTR_FATTR_NLINK;
4482         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4483         fattr->nlink = 2;
4484 }
4485
4486 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4487                 struct nfs4_fs_locations *fs_locations, struct page *page)
4488 {
4489         struct nfs_server *server = NFS_SERVER(dir);
4490         u32 bitmask[2] = {
4491                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4492                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4493         };
4494         struct nfs4_fs_locations_arg args = {
4495                 .dir_fh = NFS_FH(dir),
4496                 .name = name,
4497                 .page = page,
4498                 .bitmask = bitmask,
4499         };
4500         struct nfs4_fs_locations_res res = {
4501                 .fs_locations = fs_locations,
4502         };
4503         struct rpc_message msg = {
4504                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4505                 .rpc_argp = &args,
4506                 .rpc_resp = &res,
4507         };
4508         int status;
4509
4510         dprintk("%s: start\n", __func__);
4511         nfs_fattr_init(&fs_locations->fattr);
4512         fs_locations->server = server;
4513         fs_locations->nlocations = 0;
4514         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4515         nfs_fixup_referral_attributes(&fs_locations->fattr);
4516         dprintk("%s: returned status = %d\n", __func__, status);
4517         return status;
4518 }
4519
4520 #ifdef CONFIG_NFS_V4_1
4521 /*
4522  * Check the exchange flags returned by the server for invalid flags, having
4523  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4524  * DS flags set.
4525  */
4526 static int nfs4_check_cl_exchange_flags(u32 flags)
4527 {
4528         if (flags & ~EXCHGID4_FLAG_MASK_R)
4529                 goto out_inval;
4530         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4531             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4532                 goto out_inval;
4533         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4534                 goto out_inval;
4535         return NFS_OK;
4536 out_inval:
4537         return -NFS4ERR_INVAL;
4538 }
4539
4540 /*
4541  * nfs4_proc_exchange_id()
4542  *
4543  * Since the clientid has expired, all compounds using sessions
4544  * associated with the stale clientid will be returning
4545  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4546  * be in some phase of session reset.
4547  */
4548 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4549 {
4550         nfs4_verifier verifier;
4551         struct nfs41_exchange_id_args args = {
4552                 .client = clp,
4553                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4554         };
4555         struct nfs41_exchange_id_res res = {
4556                 .client = clp,
4557         };
4558         int status;
4559         struct rpc_message msg = {
4560                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4561                 .rpc_argp = &args,
4562                 .rpc_resp = &res,
4563                 .rpc_cred = cred,
4564         };
4565         __be32 *p;
4566
4567         dprintk("--> %s\n", __func__);
4568         BUG_ON(clp == NULL);
4569
4570         p = (u32 *)verifier.data;
4571         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4572         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4573         args.verifier = &verifier;
4574
4575         while (1) {
4576                 args.id_len = scnprintf(args.id, sizeof(args.id),
4577                                         "%s/%s %u",
4578                                         clp->cl_ipaddr,
4579                                         rpc_peeraddr2str(clp->cl_rpcclient,
4580                                                          RPC_DISPLAY_ADDR),
4581                                         clp->cl_id_uniquifier);
4582
4583                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4584
4585                 if (status != -NFS4ERR_CLID_INUSE)
4586                         break;
4587
4588                 if (signalled())
4589                         break;
4590
4591                 if (++clp->cl_id_uniquifier == 0)
4592                         break;
4593         }
4594
4595         status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4596         dprintk("<-- %s status= %d\n", __func__, status);
4597         return status;
4598 }
4599
4600 struct nfs4_get_lease_time_data {
4601         struct nfs4_get_lease_time_args *args;
4602         struct nfs4_get_lease_time_res *res;
4603         struct nfs_client *clp;
4604 };
4605
4606 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4607                                         void *calldata)
4608 {
4609         int ret;
4610         struct nfs4_get_lease_time_data *data =
4611                         (struct nfs4_get_lease_time_data *)calldata;
4612
4613         dprintk("--> %s\n", __func__);
4614         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4615         /* just setup sequence, do not trigger session recovery
4616            since we're invoked within one */
4617         ret = nfs41_setup_sequence(data->clp->cl_session,
4618                                    &data->args->la_seq_args,
4619                                    &data->res->lr_seq_res, 0, task);
4620
4621         BUG_ON(ret == -EAGAIN);
4622         rpc_call_start(task);
4623         dprintk("<-- %s\n", __func__);
4624 }
4625
4626 /*
4627  * Called from nfs4_state_manager thread for session setup, so don't recover
4628  * from sequence operation or clientid errors.
4629  */
4630 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4631 {
4632         struct nfs4_get_lease_time_data *data =
4633                         (struct nfs4_get_lease_time_data *)calldata;
4634
4635         dprintk("--> %s\n", __func__);
4636         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4637                 return;
4638         switch (task->tk_status) {
4639         case -NFS4ERR_DELAY:
4640         case -NFS4ERR_GRACE:
4641                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4642                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4643                 task->tk_status = 0;
4644                 nfs_restart_rpc(task, data->clp);
4645                 return;
4646         }
4647         dprintk("<-- %s\n", __func__);
4648 }
4649
4650 struct rpc_call_ops nfs4_get_lease_time_ops = {
4651         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4652         .rpc_call_done = nfs4_get_lease_time_done,
4653 };
4654
4655 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4656 {
4657         struct rpc_task *task;
4658         struct nfs4_get_lease_time_args args;
4659         struct nfs4_get_lease_time_res res = {
4660                 .lr_fsinfo = fsinfo,
4661         };
4662         struct nfs4_get_lease_time_data data = {
4663                 .args = &args,
4664                 .res = &res,
4665                 .clp = clp,
4666         };
4667         struct rpc_message msg = {
4668                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4669                 .rpc_argp = &args,
4670                 .rpc_resp = &res,
4671         };
4672         struct rpc_task_setup task_setup = {
4673                 .rpc_client = clp->cl_rpcclient,
4674                 .rpc_message = &msg,
4675                 .callback_ops = &nfs4_get_lease_time_ops,
4676                 .callback_data = &data
4677         };
4678         int status;
4679
4680         dprintk("--> %s\n", __func__);
4681         task = rpc_run_task(&task_setup);
4682
4683         if (IS_ERR(task))
4684                 status = PTR_ERR(task);
4685         else {
4686                 status = task->tk_status;
4687                 rpc_put_task(task);
4688         }
4689         dprintk("<-- %s return %d\n", __func__, status);
4690
4691         return status;
4692 }
4693
4694 /*
4695  * Reset a slot table
4696  */
4697 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4698                                  int ivalue)
4699 {
4700         struct nfs4_slot *new = NULL;
4701         int i;
4702         int ret = 0;
4703
4704         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4705                 max_reqs, tbl->max_slots);
4706
4707         /* Does the newly negotiated max_reqs match the existing slot table? */
4708         if (max_reqs != tbl->max_slots) {
4709                 ret = -ENOMEM;
4710                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4711                               GFP_NOFS);
4712                 if (!new)
4713                         goto out;
4714                 ret = 0;
4715                 kfree(tbl->slots);
4716         }
4717         spin_lock(&tbl->slot_tbl_lock);
4718         if (new) {
4719                 tbl->slots = new;
4720                 tbl->max_slots = max_reqs;
4721         }
4722         for (i = 0; i < tbl->max_slots; ++i)
4723                 tbl->slots[i].seq_nr = ivalue;
4724         spin_unlock(&tbl->slot_tbl_lock);
4725         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4726                 tbl, tbl->slots, tbl->max_slots);
4727 out:
4728         dprintk("<-- %s: return %d\n", __func__, ret);
4729         return ret;
4730 }
4731
4732 /*
4733  * Reset the forechannel and backchannel slot tables
4734  */
4735 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4736 {
4737         int status;
4738
4739         status = nfs4_reset_slot_table(&session->fc_slot_table,
4740                         session->fc_attrs.max_reqs, 1);
4741         if (status)
4742                 return status;
4743
4744         status = nfs4_reset_slot_table(&session->bc_slot_table,
4745                         session->bc_attrs.max_reqs, 0);
4746         return status;
4747 }
4748
4749 /* Destroy the slot table */
4750 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4751 {
4752         if (session->fc_slot_table.slots != NULL) {
4753                 kfree(session->fc_slot_table.slots);
4754                 session->fc_slot_table.slots = NULL;
4755         }
4756         if (session->bc_slot_table.slots != NULL) {
4757                 kfree(session->bc_slot_table.slots);
4758                 session->bc_slot_table.slots = NULL;
4759         }
4760         return;
4761 }
4762
4763 /*
4764  * Initialize slot table
4765  */
4766 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4767                 int max_slots, int ivalue)
4768 {
4769         struct nfs4_slot *slot;
4770         int ret = -ENOMEM;
4771
4772         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4773
4774         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4775
4776         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4777         if (!slot)
4778                 goto out;
4779         ret = 0;
4780
4781         spin_lock(&tbl->slot_tbl_lock);
4782         tbl->max_slots = max_slots;
4783         tbl->slots = slot;
4784         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4785         spin_unlock(&tbl->slot_tbl_lock);
4786         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4787                 tbl, tbl->slots, tbl->max_slots);
4788 out:
4789         dprintk("<-- %s: return %d\n", __func__, ret);
4790         return ret;
4791 }
4792
4793 /*
4794  * Initialize the forechannel and backchannel tables
4795  */
4796 static int nfs4_init_slot_tables(struct nfs4_session *session)
4797 {
4798         struct nfs4_slot_table *tbl;
4799         int status = 0;
4800
4801         tbl = &session->fc_slot_table;
4802         if (tbl->slots == NULL) {
4803                 status = nfs4_init_slot_table(tbl,
4804                                 session->fc_attrs.max_reqs, 1);
4805                 if (status)
4806                         return status;
4807         }
4808
4809         tbl = &session->bc_slot_table;
4810         if (tbl->slots == NULL) {
4811                 status = nfs4_init_slot_table(tbl,
4812                                 session->bc_attrs.max_reqs, 0);
4813                 if (status)
4814                         nfs4_destroy_slot_tables(session);
4815         }
4816
4817         return status;
4818 }
4819
4820 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4821 {
4822         struct nfs4_session *session;
4823         struct nfs4_slot_table *tbl;
4824
4825         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4826         if (!session)
4827                 return NULL;
4828
4829         tbl = &session->fc_slot_table;
4830         tbl->highest_used_slotid = -1;
4831         spin_lock_init(&tbl->slot_tbl_lock);
4832         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4833         init_completion(&tbl->complete);
4834
4835         tbl = &session->bc_slot_table;
4836         tbl->highest_used_slotid = -1;
4837         spin_lock_init(&tbl->slot_tbl_lock);
4838         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4839         init_completion(&tbl->complete);
4840
4841         session->session_state = 1<<NFS4_SESSION_INITING;
4842
4843         session->clp = clp;
4844         return session;
4845 }
4846
4847 void nfs4_destroy_session(struct nfs4_session *session)
4848 {
4849         nfs4_proc_destroy_session(session);
4850         dprintk("%s Destroy backchannel for xprt %p\n",
4851                 __func__, session->clp->cl_rpcclient->cl_xprt);
4852         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4853                                 NFS41_BC_MIN_CALLBACKS);
4854         nfs4_destroy_slot_tables(session);
4855         kfree(session);
4856 }
4857
4858 /*
4859  * Initialize the values to be used by the client in CREATE_SESSION
4860  * If nfs4_init_session set the fore channel request and response sizes,
4861  * use them.
4862  *
4863  * Set the back channel max_resp_sz_cached to zero to force the client to
4864  * always set csa_cachethis to FALSE because the current implementation
4865  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4866  */
4867 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4868 {
4869         struct nfs4_session *session = args->client->cl_session;
4870         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4871                      mxresp_sz = session->fc_attrs.max_resp_sz;
4872
4873         if (mxrqst_sz == 0)
4874                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4875         if (mxresp_sz == 0)
4876                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4877         /* Fore channel attributes */
4878         args->fc_attrs.headerpadsz = 0;
4879         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4880         args->fc_attrs.max_resp_sz = mxresp_sz;
4881         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4882         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4883
4884         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4885                 "max_ops=%u max_reqs=%u\n",
4886                 __func__,
4887                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4888                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4889
4890         /* Back channel attributes */
4891         args->bc_attrs.headerpadsz = 0;
4892         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4893         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4894         args->bc_attrs.max_resp_sz_cached = 0;
4895         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4896         args->bc_attrs.max_reqs = 1;
4897
4898         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4899                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4900                 __func__,
4901                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4902                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4903                 args->bc_attrs.max_reqs);
4904 }
4905
4906 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4907 {
4908         struct nfs4_channel_attrs *sent = &args->fc_attrs;
4909         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
4910
4911         if (rcvd->headerpadsz > sent->headerpadsz)
4912                 return -EINVAL;
4913         if (rcvd->max_resp_sz > sent->max_resp_sz)
4914                 return -EINVAL;
4915         /*
4916          * Our requested max_ops is the minimum we need; we're not
4917          * prepared to break up compounds into smaller pieces than that.
4918          * So, no point even trying to continue if the server won't
4919          * cooperate:
4920          */
4921         if (rcvd->max_ops < sent->max_ops)
4922                 return -EINVAL;
4923         if (rcvd->max_reqs == 0)
4924                 return -EINVAL;
4925         return 0;
4926 }
4927
4928 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4929 {
4930         struct nfs4_channel_attrs *sent = &args->bc_attrs;
4931         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
4932
4933         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
4934                 return -EINVAL;
4935         if (rcvd->max_resp_sz < sent->max_resp_sz)
4936                 return -EINVAL;
4937         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
4938                 return -EINVAL;
4939         /* These would render the backchannel useless: */
4940         if (rcvd->max_ops  == 0)
4941                 return -EINVAL;
4942         if (rcvd->max_reqs == 0)
4943                 return -EINVAL;
4944         return 0;
4945 }
4946
4947 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4948                                      struct nfs4_session *session)
4949 {
4950         int ret;
4951
4952         ret = nfs4_verify_fore_channel_attrs(args, session);
4953         if (ret)
4954                 return ret;
4955         return nfs4_verify_back_channel_attrs(args, session);
4956 }
4957
4958 static int _nfs4_proc_create_session(struct nfs_client *clp)
4959 {
4960         struct nfs4_session *session = clp->cl_session;
4961         struct nfs41_create_session_args args = {
4962                 .client = clp,
4963                 .cb_program = NFS4_CALLBACK,
4964         };
4965         struct nfs41_create_session_res res = {
4966                 .client = clp,
4967         };
4968         struct rpc_message msg = {
4969                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4970                 .rpc_argp = &args,
4971                 .rpc_resp = &res,
4972         };
4973         int status;
4974
4975         nfs4_init_channel_attrs(&args);
4976         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4977
4978         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4979
4980         if (!status)
4981                 /* Verify the session's negotiated channel_attrs values */
4982                 status = nfs4_verify_channel_attrs(&args, session);
4983         if (!status) {
4984                 /* Increment the clientid slot sequence id */
4985                 clp->cl_seqid++;
4986         }
4987
4988         return status;
4989 }
4990
4991 /*
4992  * Issues a CREATE_SESSION operation to the server.
4993  * It is the responsibility of the caller to verify the session is
4994  * expired before calling this routine.
4995  */
4996 int nfs4_proc_create_session(struct nfs_client *clp)
4997 {
4998         int status;
4999         unsigned *ptr;
5000         struct nfs4_session *session = clp->cl_session;
5001
5002         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5003
5004         status = _nfs4_proc_create_session(clp);
5005         if (status)
5006                 goto out;
5007
5008         /* Init and reset the fore channel */
5009         status = nfs4_init_slot_tables(session);
5010         dprintk("slot table initialization returned %d\n", status);
5011         if (status)
5012                 goto out;
5013         status = nfs4_reset_slot_tables(session);
5014         dprintk("slot table reset returned %d\n", status);
5015         if (status)
5016                 goto out;
5017
5018         ptr = (unsigned *)&session->sess_id.data[0];
5019         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5020                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5021 out:
5022         dprintk("<-- %s\n", __func__);
5023         return status;
5024 }
5025
5026 /*
5027  * Issue the over-the-wire RPC DESTROY_SESSION.
5028  * The caller must serialize access to this routine.
5029  */
5030 int nfs4_proc_destroy_session(struct nfs4_session *session)
5031 {
5032         int status = 0;
5033         struct rpc_message msg;
5034
5035         dprintk("--> nfs4_proc_destroy_session\n");
5036
5037         /* session is still being setup */
5038         if (session->clp->cl_cons_state != NFS_CS_READY)
5039                 return status;
5040
5041         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5042         msg.rpc_argp = session;
5043         msg.rpc_resp = NULL;
5044         msg.rpc_cred = NULL;
5045         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5046
5047         if (status)
5048                 printk(KERN_WARNING
5049                         "Got error %d from the server on DESTROY_SESSION. "
5050                         "Session has been destroyed regardless...\n", status);
5051
5052         dprintk("<-- nfs4_proc_destroy_session\n");
5053         return status;
5054 }
5055
5056 int nfs4_init_session(struct nfs_server *server)
5057 {
5058         struct nfs_client *clp = server->nfs_client;
5059         struct nfs4_session *session;
5060         unsigned int rsize, wsize;
5061         int ret;
5062
5063         if (!nfs4_has_session(clp))
5064                 return 0;
5065
5066         session = clp->cl_session;
5067         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5068                 return 0;
5069
5070         rsize = server->rsize;
5071         if (rsize == 0)
5072                 rsize = NFS_MAX_FILE_IO_SIZE;
5073         wsize = server->wsize;
5074         if (wsize == 0)
5075                 wsize = NFS_MAX_FILE_IO_SIZE;
5076
5077         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5078         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5079
5080         ret = nfs4_recover_expired_lease(server);
5081         if (!ret)
5082                 ret = nfs4_check_client_ready(clp);
5083         return ret;
5084 }
5085
5086 /*
5087  * Renew the cl_session lease.
5088  */
5089 struct nfs4_sequence_data {
5090         struct nfs_client *clp;
5091         struct nfs4_sequence_args args;
5092         struct nfs4_sequence_res res;
5093 };
5094
5095 static void nfs41_sequence_release(void *data)
5096 {
5097         struct nfs4_sequence_data *calldata = data;
5098         struct nfs_client *clp = calldata->clp;
5099
5100         if (atomic_read(&clp->cl_count) > 1)
5101                 nfs4_schedule_state_renewal(clp);
5102         nfs_put_client(clp);
5103         kfree(calldata);
5104 }
5105
5106 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5107 {
5108         switch(task->tk_status) {
5109         case -NFS4ERR_DELAY:
5110                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5111                 return -EAGAIN;
5112         default:
5113                 nfs4_schedule_state_recovery(clp);
5114         }
5115         return 0;
5116 }
5117
5118 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5119 {
5120         struct nfs4_sequence_data *calldata = data;
5121         struct nfs_client *clp = calldata->clp;
5122
5123         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5124                 return;
5125
5126         if (task->tk_status < 0) {
5127                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5128                 if (atomic_read(&clp->cl_count) == 1)
5129                         goto out;
5130
5131                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5132                         rpc_restart_call_prepare(task);
5133                         return;
5134                 }
5135         }
5136         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5137 out:
5138         dprintk("<-- %s\n", __func__);
5139 }
5140
5141 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5142 {
5143         struct nfs4_sequence_data *calldata = data;
5144         struct nfs_client *clp = calldata->clp;
5145         struct nfs4_sequence_args *args;
5146         struct nfs4_sequence_res *res;
5147
5148         args = task->tk_msg.rpc_argp;
5149         res = task->tk_msg.rpc_resp;
5150
5151         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5152                 return;
5153         rpc_call_start(task);
5154 }
5155
5156 static const struct rpc_call_ops nfs41_sequence_ops = {
5157         .rpc_call_done = nfs41_sequence_call_done,
5158         .rpc_call_prepare = nfs41_sequence_prepare,
5159         .rpc_release = nfs41_sequence_release,
5160 };
5161
5162 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5163 {
5164         struct nfs4_sequence_data *calldata;
5165         struct rpc_message msg = {
5166                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5167                 .rpc_cred = cred,
5168         };
5169         struct rpc_task_setup task_setup_data = {
5170                 .rpc_client = clp->cl_rpcclient,
5171                 .rpc_message = &msg,
5172                 .callback_ops = &nfs41_sequence_ops,
5173                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5174         };
5175
5176         if (!atomic_inc_not_zero(&clp->cl_count))
5177                 return ERR_PTR(-EIO);
5178         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5179         if (calldata == NULL) {
5180                 nfs_put_client(clp);
5181                 return ERR_PTR(-ENOMEM);
5182         }
5183         msg.rpc_argp = &calldata->args;
5184         msg.rpc_resp = &calldata->res;
5185         calldata->clp = clp;
5186         task_setup_data.callback_data = calldata;
5187
5188         return rpc_run_task(&task_setup_data);
5189 }
5190
5191 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5192 {
5193         struct rpc_task *task;
5194         int ret = 0;
5195
5196         task = _nfs41_proc_sequence(clp, cred);
5197         if (IS_ERR(task))
5198                 ret = PTR_ERR(task);
5199         else
5200                 rpc_put_task(task);
5201         dprintk("<-- %s status=%d\n", __func__, ret);
5202         return ret;
5203 }
5204
5205 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5206 {
5207         struct rpc_task *task;
5208         int ret;
5209
5210         task = _nfs41_proc_sequence(clp, cred);
5211         if (IS_ERR(task)) {
5212                 ret = PTR_ERR(task);
5213                 goto out;
5214         }
5215         ret = rpc_wait_for_completion_task(task);
5216         if (!ret)
5217                 ret = task->tk_status;
5218         rpc_put_task(task);
5219 out:
5220         dprintk("<-- %s status=%d\n", __func__, ret);
5221         return ret;
5222 }
5223
5224 struct nfs4_reclaim_complete_data {
5225         struct nfs_client *clp;
5226         struct nfs41_reclaim_complete_args arg;
5227         struct nfs41_reclaim_complete_res res;
5228 };
5229
5230 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5231 {
5232         struct nfs4_reclaim_complete_data *calldata = data;
5233
5234         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5235         if (nfs41_setup_sequence(calldata->clp->cl_session,
5236                                 &calldata->arg.seq_args,
5237                                 &calldata->res.seq_res, 0, task))
5238                 return;
5239
5240         rpc_call_start(task);
5241 }
5242
5243 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5244 {
5245         switch(task->tk_status) {
5246         case 0:
5247         case -NFS4ERR_COMPLETE_ALREADY:
5248         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5249                 break;
5250         case -NFS4ERR_DELAY:
5251                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5252                 return -EAGAIN;
5253         default:
5254                 nfs4_schedule_state_recovery(clp);
5255         }
5256         return 0;
5257 }
5258
5259 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5260 {
5261         struct nfs4_reclaim_complete_data *calldata = data;
5262         struct nfs_client *clp = calldata->clp;
5263         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5264
5265         dprintk("--> %s\n", __func__);
5266         if (!nfs41_sequence_done(task, res))
5267                 return;
5268
5269         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5270                 rpc_restart_call_prepare(task);
5271                 return;
5272         }
5273         dprintk("<-- %s\n", __func__);
5274 }
5275
5276 static void nfs4_free_reclaim_complete_data(void *data)
5277 {
5278         struct nfs4_reclaim_complete_data *calldata = data;
5279
5280         kfree(calldata);
5281 }
5282
5283 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5284         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5285         .rpc_call_done = nfs4_reclaim_complete_done,
5286         .rpc_release = nfs4_free_reclaim_complete_data,
5287 };
5288
5289 /*
5290  * Issue a global reclaim complete.
5291  */
5292 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5293 {
5294         struct nfs4_reclaim_complete_data *calldata;
5295         struct rpc_task *task;
5296         struct rpc_message msg = {
5297                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5298         };
5299         struct rpc_task_setup task_setup_data = {
5300                 .rpc_client = clp->cl_rpcclient,
5301                 .rpc_message = &msg,
5302                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5303                 .flags = RPC_TASK_ASYNC,
5304         };
5305         int status = -ENOMEM;
5306
5307         dprintk("--> %s\n", __func__);
5308         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5309         if (calldata == NULL)
5310                 goto out;
5311         calldata->clp = clp;
5312         calldata->arg.one_fs = 0;
5313
5314         msg.rpc_argp = &calldata->arg;
5315         msg.rpc_resp = &calldata->res;
5316         task_setup_data.callback_data = calldata;
5317         task = rpc_run_task(&task_setup_data);
5318         if (IS_ERR(task)) {
5319                 status = PTR_ERR(task);
5320                 goto out;
5321         }
5322         rpc_put_task(task);
5323         return 0;
5324 out:
5325         dprintk("<-- %s status=%d\n", __func__, status);
5326         return status;
5327 }
5328
5329 static void
5330 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5331 {
5332         struct nfs4_layoutget *lgp = calldata;
5333         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5334
5335         dprintk("--> %s\n", __func__);
5336         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5337          * right now covering the LAYOUTGET we are about to send.
5338          * However, that is not so catastrophic, and there seems
5339          * to be no way to prevent it completely.
5340          */
5341         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5342                                 &lgp->res.seq_res, 0, task))
5343                 return;
5344         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5345                                           NFS_I(lgp->args.inode)->layout,
5346                                           lgp->args.ctx->state)) {
5347                 rpc_exit(task, NFS4_OK);
5348                 return;
5349         }
5350         rpc_call_start(task);
5351 }
5352
5353 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5354 {
5355         struct nfs4_layoutget *lgp = calldata;
5356         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5357
5358         dprintk("--> %s\n", __func__);
5359
5360         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5361                 return;
5362
5363         switch (task->tk_status) {
5364         case 0:
5365                 break;
5366         case -NFS4ERR_LAYOUTTRYLATER:
5367         case -NFS4ERR_RECALLCONFLICT:
5368                 task->tk_status = -NFS4ERR_DELAY;
5369                 /* Fall through */
5370         default:
5371                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5372                         rpc_restart_call_prepare(task);
5373                         return;
5374                 }
5375         }
5376         dprintk("<-- %s\n", __func__);
5377 }
5378
5379 static void nfs4_layoutget_release(void *calldata)
5380 {
5381         struct nfs4_layoutget *lgp = calldata;
5382
5383         dprintk("--> %s\n", __func__);
5384         if (lgp->res.layout.buf != NULL)
5385                 free_page((unsigned long) lgp->res.layout.buf);
5386         put_nfs_open_context(lgp->args.ctx);
5387         kfree(calldata);
5388         dprintk("<-- %s\n", __func__);
5389 }
5390
5391 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5392         .rpc_call_prepare = nfs4_layoutget_prepare,
5393         .rpc_call_done = nfs4_layoutget_done,
5394         .rpc_release = nfs4_layoutget_release,
5395 };
5396
5397 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5398 {
5399         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5400         struct rpc_task *task;
5401         struct rpc_message msg = {
5402                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5403                 .rpc_argp = &lgp->args,
5404                 .rpc_resp = &lgp->res,
5405         };
5406         struct rpc_task_setup task_setup_data = {
5407                 .rpc_client = server->client,
5408                 .rpc_message = &msg,
5409                 .callback_ops = &nfs4_layoutget_call_ops,
5410                 .callback_data = lgp,
5411                 .flags = RPC_TASK_ASYNC,
5412         };
5413         int status = 0;
5414
5415         dprintk("--> %s\n", __func__);
5416
5417         lgp->res.layout.buf = (void *)__get_free_page(GFP_NOFS);
5418         if (lgp->res.layout.buf == NULL) {
5419                 nfs4_layoutget_release(lgp);
5420                 return -ENOMEM;
5421         }
5422
5423         lgp->res.seq_res.sr_slot = NULL;
5424         task = rpc_run_task(&task_setup_data);
5425         if (IS_ERR(task))
5426                 return PTR_ERR(task);
5427         status = nfs4_wait_for_completion_rpc_task(task);
5428         if (status == 0)
5429                 status = task->tk_status;
5430         if (status == 0)
5431                 status = pnfs_layout_process(lgp);
5432         rpc_put_task(task);
5433         dprintk("<-- %s status=%d\n", __func__, status);
5434         return status;
5435 }
5436
5437 static int
5438 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5439 {
5440         struct nfs4_getdeviceinfo_args args = {
5441                 .pdev = pdev,
5442         };
5443         struct nfs4_getdeviceinfo_res res = {
5444                 .pdev = pdev,
5445         };
5446         struct rpc_message msg = {
5447                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5448                 .rpc_argp = &args,
5449                 .rpc_resp = &res,
5450         };
5451         int status;
5452
5453         dprintk("--> %s\n", __func__);
5454         status = nfs4_call_sync(server, &msg, &args, &res, 0);
5455         dprintk("<-- %s status=%d\n", __func__, status);
5456
5457         return status;
5458 }
5459
5460 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5461 {
5462         struct nfs4_exception exception = { };
5463         int err;
5464
5465         do {
5466                 err = nfs4_handle_exception(server,
5467                                         _nfs4_proc_getdeviceinfo(server, pdev),
5468                                         &exception);
5469         } while (exception.retry);
5470         return err;
5471 }
5472 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5473
5474 #endif /* CONFIG_NFS_V4_1 */
5475
5476 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5477         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5478         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5479         .recover_open   = nfs4_open_reclaim,
5480         .recover_lock   = nfs4_lock_reclaim,
5481         .establish_clid = nfs4_init_clientid,
5482         .get_clid_cred  = nfs4_get_setclientid_cred,
5483 };
5484
5485 #if defined(CONFIG_NFS_V4_1)
5486 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5487         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5488         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5489         .recover_open   = nfs4_open_reclaim,
5490         .recover_lock   = nfs4_lock_reclaim,
5491         .establish_clid = nfs41_init_clientid,
5492         .get_clid_cred  = nfs4_get_exchange_id_cred,
5493         .reclaim_complete = nfs41_proc_reclaim_complete,
5494 };
5495 #endif /* CONFIG_NFS_V4_1 */
5496
5497 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5498         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5499         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5500         .recover_open   = nfs4_open_expired,
5501         .recover_lock   = nfs4_lock_expired,
5502         .establish_clid = nfs4_init_clientid,
5503         .get_clid_cred  = nfs4_get_setclientid_cred,
5504 };
5505
5506 #if defined(CONFIG_NFS_V4_1)
5507 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5508         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5509         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5510         .recover_open   = nfs4_open_expired,
5511         .recover_lock   = nfs4_lock_expired,
5512         .establish_clid = nfs41_init_clientid,
5513         .get_clid_cred  = nfs4_get_exchange_id_cred,
5514 };
5515 #endif /* CONFIG_NFS_V4_1 */
5516
5517 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5518         .sched_state_renewal = nfs4_proc_async_renew,
5519         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5520         .renew_lease = nfs4_proc_renew,
5521 };
5522
5523 #if defined(CONFIG_NFS_V4_1)
5524 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5525         .sched_state_renewal = nfs41_proc_async_sequence,
5526         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5527         .renew_lease = nfs4_proc_sequence,
5528 };
5529 #endif
5530
5531 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5532         .minor_version = 0,
5533         .call_sync = _nfs4_call_sync,
5534         .validate_stateid = nfs4_validate_delegation_stateid,
5535         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5536         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5537         .state_renewal_ops = &nfs40_state_renewal_ops,
5538 };
5539
5540 #if defined(CONFIG_NFS_V4_1)
5541 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5542         .minor_version = 1,
5543         .call_sync = _nfs4_call_sync_session,
5544         .validate_stateid = nfs41_validate_delegation_stateid,
5545         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5546         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5547         .state_renewal_ops = &nfs41_state_renewal_ops,
5548 };
5549 #endif
5550
5551 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5552         [0] = &nfs_v4_0_minor_ops,
5553 #if defined(CONFIG_NFS_V4_1)
5554         [1] = &nfs_v4_1_minor_ops,
5555 #endif
5556 };
5557
5558 static const struct inode_operations nfs4_file_inode_operations = {
5559         .permission     = nfs_permission,
5560         .getattr        = nfs_getattr,
5561         .setattr        = nfs_setattr,
5562         .getxattr       = generic_getxattr,
5563         .setxattr       = generic_setxattr,
5564         .listxattr      = generic_listxattr,
5565         .removexattr    = generic_removexattr,
5566 };
5567
5568 const struct nfs_rpc_ops nfs_v4_clientops = {
5569         .version        = 4,                    /* protocol version */
5570         .dentry_ops     = &nfs4_dentry_operations,
5571         .dir_inode_ops  = &nfs4_dir_inode_operations,
5572         .file_inode_ops = &nfs4_file_inode_operations,
5573         .getroot        = nfs4_proc_get_root,
5574         .getattr        = nfs4_proc_getattr,
5575         .setattr        = nfs4_proc_setattr,
5576         .lookupfh       = nfs4_proc_lookupfh,
5577         .lookup         = nfs4_proc_lookup,
5578         .access         = nfs4_proc_access,
5579         .readlink       = nfs4_proc_readlink,
5580         .create         = nfs4_proc_create,
5581         .remove         = nfs4_proc_remove,
5582         .unlink_setup   = nfs4_proc_unlink_setup,
5583         .unlink_done    = nfs4_proc_unlink_done,
5584         .rename         = nfs4_proc_rename,
5585         .rename_setup   = nfs4_proc_rename_setup,
5586         .rename_done    = nfs4_proc_rename_done,
5587         .link           = nfs4_proc_link,
5588         .symlink        = nfs4_proc_symlink,
5589         .mkdir          = nfs4_proc_mkdir,
5590         .rmdir          = nfs4_proc_remove,
5591         .readdir        = nfs4_proc_readdir,
5592         .mknod          = nfs4_proc_mknod,
5593         .statfs         = nfs4_proc_statfs,
5594         .fsinfo         = nfs4_proc_fsinfo,
5595         .pathconf       = nfs4_proc_pathconf,
5596         .set_capabilities = nfs4_server_capabilities,
5597         .decode_dirent  = nfs4_decode_dirent,
5598         .read_setup     = nfs4_proc_read_setup,
5599         .read_done      = nfs4_read_done,
5600         .write_setup    = nfs4_proc_write_setup,
5601         .write_done     = nfs4_write_done,
5602         .commit_setup   = nfs4_proc_commit_setup,
5603         .commit_done    = nfs4_commit_done,
5604         .lock           = nfs4_proc_lock,
5605         .clear_acl_cache = nfs4_zap_acl_attr,
5606         .close_context  = nfs4_close_context,
5607         .open_context   = nfs4_atomic_open,
5608 };
5609
5610 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
5611         .prefix = XATTR_NAME_NFSV4_ACL,
5612         .list   = nfs4_xattr_list_nfs4_acl,
5613         .get    = nfs4_xattr_get_nfs4_acl,
5614         .set    = nfs4_xattr_set_nfs4_acl,
5615 };
5616
5617 const struct xattr_handler *nfs4_xattr_handlers[] = {
5618         &nfs4_xattr_nfs4_acl_handler,
5619         NULL
5620 };
5621
5622 /*
5623  * Local variables:
5624  *  c-basic-offset: 8
5625  * End:
5626  */