fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/namei.h>
  49 #include <linux/mount.h>
  50 #include <linux/module.h>
  51 #include <linux/sunrpc/bc_xprt.h>
  52 #include <linux/xattr.h>
  53 #include <linux/utsname.h>
  54
  55 #include "nfs4_fs.h"
  56 #include "delegation.h"
  57 #include "internal.h"
  58 #include "iostat.h"
  59 #include "callback.h"
  60 #include "pnfs.h"
  61
  62 #define NFSDBG_FACILITY         NFSDBG_PROC
  63
  64 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  65 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  66
  67 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  68
  69 struct nfs4_opendata;
  70 static int _nfs4_proc_open(struct nfs4_opendata *data);
  71 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  72 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  73 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  74 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  75 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  76 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  77                             struct nfs_fattr *fattr, struct iattr *sattr,
  78                             struct nfs4_state *state);
  79
  80 /* Prevent leaks of NFSv4 errors into userland */
  81 static int nfs4_map_errors(int err)
  82 {
  83         if (err >= -1000)
  84                 return err;
  85         switch (err) {
  86         case -NFS4ERR_RESOURCE:
  87                 return -EREMOTEIO;
  88         default:
  89                 dprintk("%s could not handle NFSv4 error %d\n",
  90                                 __func__, -err);
  91                 break;
  92         }
  93         return -EIO;
  94 }
  95
  96 /*
  97  * This is our standard bitmap for GETATTR requests.
  98  */
  99 const u32 nfs4_fattr_bitmap[2] = {
 100         FATTR4_WORD0_TYPE
 101         | FATTR4_WORD0_CHANGE
 102         | FATTR4_WORD0_SIZE
 103         | FATTR4_WORD0_FSID
 104         | FATTR4_WORD0_FILEID,
 105         FATTR4_WORD1_MODE
 106         | FATTR4_WORD1_NUMLINKS
 107         | FATTR4_WORD1_OWNER
 108         | FATTR4_WORD1_OWNER_GROUP
 109         | FATTR4_WORD1_RAWDEV
 110         | FATTR4_WORD1_SPACE_USED
 111         | FATTR4_WORD1_TIME_ACCESS
 112         | FATTR4_WORD1_TIME_METADATA
 113         | FATTR4_WORD1_TIME_MODIFY
 114 };
 115
 116 const u32 nfs4_statfs_bitmap[2] = {
 117         FATTR4_WORD0_FILES_AVAIL
 118         | FATTR4_WORD0_FILES_FREE
 119         | FATTR4_WORD0_FILES_TOTAL,
 120         FATTR4_WORD1_SPACE_AVAIL
 121         | FATTR4_WORD1_SPACE_FREE
 122         | FATTR4_WORD1_SPACE_TOTAL
 123 };
 124
 125 const u32 nfs4_pathconf_bitmap[2] = {
 126         FATTR4_WORD0_MAXLINK
 127         | FATTR4_WORD0_MAXNAME,
 128         0
 129 };
 130
 131 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 132                         | FATTR4_WORD0_MAXREAD
 133                         | FATTR4_WORD0_MAXWRITE
 134                         | FATTR4_WORD0_LEASE_TIME,
 135                         FATTR4_WORD1_TIME_DELTA
 136                         | FATTR4_WORD1_FS_LAYOUT_TYPES
 137 };
 138
 139 const u32 nfs4_fs_locations_bitmap[2] = {
 140         FATTR4_WORD0_TYPE
 141         | FATTR4_WORD0_CHANGE
 142         | FATTR4_WORD0_SIZE
 143         | FATTR4_WORD0_FSID
 144         | FATTR4_WORD0_FILEID
 145         | FATTR4_WORD0_FS_LOCATIONS,
 146         FATTR4_WORD1_MODE
 147         | FATTR4_WORD1_NUMLINKS
 148         | FATTR4_WORD1_OWNER
 149         | FATTR4_WORD1_OWNER_GROUP
 150         | FATTR4_WORD1_RAWDEV
 151         | FATTR4_WORD1_SPACE_USED
 152         | FATTR4_WORD1_TIME_ACCESS
 153         | FATTR4_WORD1_TIME_METADATA
 154         | FATTR4_WORD1_TIME_MODIFY
 155         | FATTR4_WORD1_MOUNTED_ON_FILEID
 156 };
 157
 158 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 159                 struct nfs4_readdir_arg *readdir)
 160 {
 161         __be32 *start, *p;
 162
 163         BUG_ON(readdir->count < 80);
 164         if (cookie > 2) {
 165                 readdir->cookie = cookie;
 166                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 167                 return;
 168         }
 169
 170         readdir->cookie = 0;
 171         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 172         if (cookie == 2)
 173                 return;
 174
 175         /*
 176          * NFSv4 servers do not return entries for '.' and '..'
 177          * Therefore, we fake these entries here.  We let '.'
 178          * have cookie 0 and '..' have cookie 1.  Note that
 179          * when talking to the server, we always send cookie 0
 180          * instead of 1 or 2.
 181          */
 182         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 183
 184         if (cookie == 0) {
 185                 *p++ = xdr_one;                                  /* next */
 186                 *p++ = xdr_zero;                   /* cookie, first word */
 187                 *p++ = xdr_one;                   /* cookie, second word */
 188                 *p++ = xdr_one;                             /* entry len */
 189                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 190                 p++;
 191                 *p++ = xdr_one;                         /* bitmap length */
 192                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 193                 *p++ = htonl(8);              /* attribute buffer length */
 194                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 195         }
 196
 197         *p++ = xdr_one;                                  /* next */
 198         *p++ = xdr_zero;                   /* cookie, first word */
 199         *p++ = xdr_two;                   /* cookie, second word */
 200         *p++ = xdr_two;                             /* entry len */
 201         memcpy(p, "..\0\0", 4);                         /* entry */
 202         p++;
 203         *p++ = xdr_one;                         /* bitmap length */
 204         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 205         *p++ = htonl(8);              /* attribute buffer length */
 206         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 207
 208         readdir->pgbase = (char *)p - (char *)start;
 209         readdir->count -= readdir->pgbase;
 210         kunmap_atomic(start, KM_USER0);
 211 }
 212
 213 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 214 {
 215         int res;
 216
 217         might_sleep();
 218
 219         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 220                         nfs_wait_bit_killable, TASK_KILLABLE);
 221         return res;
 222 }
 223
 224 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 225 {
 226         int res = 0;
 227
 228         might_sleep();
 229
 230         if (*timeout <= 0)
 231                 *timeout = NFS4_POLL_RETRY_MIN;
 232         if (*timeout > NFS4_POLL_RETRY_MAX)
 233                 *timeout = NFS4_POLL_RETRY_MAX;
 234         schedule_timeout_killable(*timeout);
 235         if (fatal_signal_pending(current))
 236                 res = -ERESTARTSYS;
 237         *timeout <<= 1;
 238         return res;
 239 }
 240
 241 /* This is the error handling routine for processes that are allowed
 242  * to sleep.
 243  */
 244 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 245 {
 246         struct nfs_client *clp = server->nfs_client;
 247         struct nfs4_state *state = exception->state;
 248         int ret = errorcode;
 249
 250         exception->retry = 0;
 251         switch(errorcode) {
 252                 case 0:
 253                         return 0;
 254                 case -NFS4ERR_ADMIN_REVOKED:
 255                 case -NFS4ERR_BAD_STATEID:
 256                 case -NFS4ERR_OPENMODE:
 257                         if (state == NULL)
 258                                 break;
 259                         nfs4_state_mark_reclaim_nograce(clp, state);
 260                         goto do_state_recovery;
 261                 case -NFS4ERR_STALE_STATEID:
 262                 case -NFS4ERR_STALE_CLIENTID:
 263                 case -NFS4ERR_EXPIRED:
 264                         goto do_state_recovery;
 265 #if defined(CONFIG_NFS_V4_1)
 266                 case -NFS4ERR_BADSESSION:
 267                 case -NFS4ERR_BADSLOT:
 268                 case -NFS4ERR_BAD_HIGH_SLOT:
 269                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 270                 case -NFS4ERR_DEADSESSION:
 271                 case -NFS4ERR_SEQ_FALSE_RETRY:
 272                 case -NFS4ERR_SEQ_MISORDERED:
 273                         dprintk("%s ERROR: %d Reset session\n", __func__,
 274                                 errorcode);
 275                         nfs4_schedule_state_recovery(clp);
 276                         exception->retry = 1;
 277                         break;
 278 #endif /* defined(CONFIG_NFS_V4_1) */
 279                 case -NFS4ERR_FILE_OPEN:
 280                         if (exception->timeout > HZ) {
 281                                 /* We have retried a decent amount, time to
 282                                  * fail
 283                                  */
 284                                 ret = -EBUSY;
 285                                 break;
 286                         }
 287                 case -NFS4ERR_GRACE:
 288                 case -NFS4ERR_DELAY:
 289                 case -EKEYEXPIRED:
 290                         ret = nfs4_delay(server->client, &exception->timeout);
 291                         if (ret != 0)
 292                                 break;
 293                 case -NFS4ERR_OLD_STATEID:
 294                         exception->retry = 1;
 295         }
 296         /* We failed to handle the error */
 297         return nfs4_map_errors(ret);
 298 do_state_recovery:
 299         nfs4_schedule_state_recovery(clp);
 300         ret = nfs4_wait_clnt_recover(clp);
 301         if (ret == 0)
 302                 exception->retry = 1;
 303         return ret;
 304 }
 305
 306
 307 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 308 {
 309         spin_lock(&clp->cl_lock);
 310         if (time_before(clp->cl_last_renewal,timestamp))
 311                 clp->cl_last_renewal = timestamp;
 312         spin_unlock(&clp->cl_lock);
 313 }
 314
 315 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 316 {
 317         do_renew_lease(server->nfs_client, timestamp);
 318 }
 319
 320 #if defined(CONFIG_NFS_V4_1)
 321
 322 /*
 323  * nfs4_free_slot - free a slot and efficiently update slot table.
 324  *
 325  * freeing a slot is trivially done by clearing its respective bit
 326  * in the bitmap.
 327  * If the freed slotid equals highest_used_slotid we want to update it
 328  * so that the server would be able to size down the slot table if needed,
 329  * otherwise we know that the highest_used_slotid is still in use.
 330  * When updating highest_used_slotid there may be "holes" in the bitmap
 331  * so we need to scan down from highest_used_slotid to 0 looking for the now
 332  * highest slotid in use.
 333  * If none found, highest_used_slotid is set to -1.
 334  *
 335  * Must be called while holding tbl->slot_tbl_lock
 336  */
 337 static void
 338 nfs4_free_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *free_slot)
 339 {
 340         int free_slotid = free_slot - tbl->slots;
 341         int slotid = free_slotid;
 342
 343         BUG_ON(slotid < 0 || slotid >= NFS4_MAX_SLOT_TABLE);
 344         /* clear used bit in bitmap */
 345         __clear_bit(slotid, tbl->used_slots);
 346
 347         /* update highest_used_slotid when it is freed */
 348         if (slotid == tbl->highest_used_slotid) {
 349                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 350                 if (slotid < tbl->max_slots)
 351                         tbl->highest_used_slotid = slotid;
 352                 else
 353                         tbl->highest_used_slotid = -1;
 354         }
 355         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 356                 free_slotid, tbl->highest_used_slotid);
 357 }
 358
 359 /*
 360  * Signal state manager thread if session fore channel is drained
 361  */
 362 static void nfs4_check_drain_fc_complete(struct nfs4_session *ses)
 363 {
 364         struct rpc_task *task;
 365
 366         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 367                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 368                 if (task)
 369                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 370                 return;
 371         }
 372
 373         if (ses->fc_slot_table.highest_used_slotid != -1)
 374                 return;
 375
 376         dprintk("%s COMPLETE: Session Fore Channel Drained\n", __func__);
 377         complete(&ses->fc_slot_table.complete);
 378 }
 379
 380 /*
 381  * Signal state manager thread if session back channel is drained
 382  */
 383 void nfs4_check_drain_bc_complete(struct nfs4_session *ses)
 384 {
 385         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state) ||
 386             ses->bc_slot_table.highest_used_slotid != -1)
 387                 return;
 388         dprintk("%s COMPLETE: Session Back Channel Drained\n", __func__);
 389         complete(&ses->bc_slot_table.complete);
 390 }
 391
 392 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 393 {
 394         struct nfs4_slot_table *tbl;
 395
 396         tbl = &res->sr_session->fc_slot_table;
 397         if (!res->sr_slot) {
 398                 /* just wake up the next guy waiting since
 399                  * we may have not consumed a slot after all */
 400                 dprintk("%s: No slot\n", __func__);
 401                 return;
 402         }
 403
 404         spin_lock(&tbl->slot_tbl_lock);
 405         nfs4_free_slot(tbl, res->sr_slot);
 406         nfs4_check_drain_fc_complete(res->sr_session);
 407         spin_unlock(&tbl->slot_tbl_lock);
 408         res->sr_slot = NULL;
 409 }
 410
 411 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 412 {
 413         unsigned long timestamp;
 414         struct nfs_client *clp;
 415
 416         /*
 417          * sr_status remains 1 if an RPC level error occurred. The server
 418          * may or may not have processed the sequence operation..
 419          * Proceed as if the server received and processed the sequence
 420          * operation.
 421          */
 422         if (res->sr_status == 1)
 423                 res->sr_status = NFS_OK;
 424
 425         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 426         if (!res->sr_slot)
 427                 goto out;
 428
 429         /* Check the SEQUENCE operation status */
 430         switch (res->sr_status) {
 431         case 0:
 432                 /* Update the slot's sequence and clientid lease timer */
 433                 ++res->sr_slot->seq_nr;
 434                 timestamp = res->sr_renewal_time;
 435                 clp = res->sr_session->clp;
 436                 do_renew_lease(clp, timestamp);
 437                 /* Check sequence flags */
 438                 if (atomic_read(&clp->cl_count) > 1)
 439                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 440                 break;
 441         case -NFS4ERR_DELAY:
 442                 /* The server detected a resend of the RPC call and
 443                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 444                  * of RFC5661.
 445                  */
 446                 dprintk("%s: slot=%td seq=%d: Operation in progress\n",
 447                         __func__,
 448                         res->sr_slot - res->sr_session->fc_slot_table.slots,
 449                         res->sr_slot->seq_nr);
 450                 goto out_retry;
 451         default:
 452                 /* Just update the slot sequence no. */
 453                 ++res->sr_slot->seq_nr;
 454         }
 455 out:
 456         /* The session may be reset by one of the error handlers. */
 457         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 458         nfs41_sequence_free_slot(res);
 459         return 1;
 460 out_retry:
 461         if (!rpc_restart_call(task))
 462                 goto out;
 463         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 464         return 0;
 465 }
 466
 467 static int nfs4_sequence_done(struct rpc_task *task,
 468                                struct nfs4_sequence_res *res)
 469 {
 470         if (res->sr_session == NULL)
 471                 return 1;
 472         return nfs41_sequence_done(task, res);
 473 }
 474
 475 /*
 476  * nfs4_find_slot - efficiently look for a free slot
 477  *
 478  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 479  * If found, we mark the slot as used, update the highest_used_slotid,
 480  * and respectively set up the sequence operation args.
 481  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 482  *
 483  * Note: must be called with under the slot_tbl_lock.
 484  */
 485 static u8
 486 nfs4_find_slot(struct nfs4_slot_table *tbl)
 487 {
 488         int slotid;
 489         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 490         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 491
 492         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 493                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 494                 tbl->max_slots);
 495         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 496         if (slotid >= tbl->max_slots)
 497                 goto out;
 498         __set_bit(slotid, tbl->used_slots);
 499         if (slotid > tbl->highest_used_slotid)
 500                 tbl->highest_used_slotid = slotid;
 501         ret_id = slotid;
 502 out:
 503         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 504                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 505         return ret_id;
 506 }
 507
 508 static int nfs41_setup_sequence(struct nfs4_session *session,
 509                                 struct nfs4_sequence_args *args,
 510                                 struct nfs4_sequence_res *res,
 511                                 int cache_reply,
 512                                 struct rpc_task *task)
 513 {
 514         struct nfs4_slot *slot;
 515         struct nfs4_slot_table *tbl;
 516         u8 slotid;
 517
 518         dprintk("--> %s\n", __func__);
 519         /* slot already allocated? */
 520         if (res->sr_slot != NULL)
 521                 return 0;
 522
 523         tbl = &session->fc_slot_table;
 524
 525         spin_lock(&tbl->slot_tbl_lock);
 526         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 527             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 528                 /*
 529                  * The state manager will wait until the slot table is empty.
 530                  * Schedule the reset thread
 531                  */
 532                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 533                 spin_unlock(&tbl->slot_tbl_lock);
 534                 dprintk("%s Schedule Session Reset\n", __func__);
 535                 return -EAGAIN;
 536         }
 537
 538         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 539             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 540                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 541                 spin_unlock(&tbl->slot_tbl_lock);
 542                 dprintk("%s enforce FIFO order\n", __func__);
 543                 return -EAGAIN;
 544         }
 545
 546         slotid = nfs4_find_slot(tbl);
 547         if (slotid == NFS4_MAX_SLOT_TABLE) {
 548                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 549                 spin_unlock(&tbl->slot_tbl_lock);
 550                 dprintk("<-- %s: no free slots\n", __func__);
 551                 return -EAGAIN;
 552         }
 553         spin_unlock(&tbl->slot_tbl_lock);
 554
 555         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 556         slot = tbl->slots + slotid;
 557         args->sa_session = session;
 558         args->sa_slotid = slotid;
 559         args->sa_cache_this = cache_reply;
 560
 561         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 562
 563         res->sr_session = session;
 564         res->sr_slot = slot;
 565         res->sr_renewal_time = jiffies;
 566         res->sr_status_flags = 0;
 567         /*
 568          * sr_status is only set in decode_sequence, and so will remain
 569          * set to 1 if an rpc level failure occurs.
 570          */
 571         res->sr_status = 1;
 572         return 0;
 573 }
 574
 575 int nfs4_setup_sequence(const struct nfs_server *server,
 576                         struct nfs4_sequence_args *args,
 577                         struct nfs4_sequence_res *res,
 578                         int cache_reply,
 579                         struct rpc_task *task)
 580 {
 581         struct nfs4_session *session = nfs4_get_session(server);
 582         int ret = 0;
 583
 584         if (session == NULL) {
 585                 args->sa_session = NULL;
 586                 res->sr_session = NULL;
 587                 goto out;
 588         }
 589
 590         dprintk("--> %s clp %p session %p sr_slot %td\n",
 591                 __func__, session->clp, session, res->sr_slot ?
 592                         res->sr_slot - session->fc_slot_table.slots : -1);
 593
 594         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 595                                    task);
 596 out:
 597         dprintk("<-- %s status=%d\n", __func__, ret);
 598         return ret;
 599 }
 600
 601 struct nfs41_call_sync_data {
 602         const struct nfs_server *seq_server;
 603         struct nfs4_sequence_args *seq_args;
 604         struct nfs4_sequence_res *seq_res;
 605         int cache_reply;
 606 };
 607
 608 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 609 {
 610         struct nfs41_call_sync_data *data = calldata;
 611
 612         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 613
 614         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 615                                 data->seq_res, data->cache_reply, task))
 616                 return;
 617         rpc_call_start(task);
 618 }
 619
 620 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 621 {
 622         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 623         nfs41_call_sync_prepare(task, calldata);
 624 }
 625
 626 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 627 {
 628         struct nfs41_call_sync_data *data = calldata;
 629
 630         nfs41_sequence_done(task, data->seq_res);
 631 }
 632
 633 struct rpc_call_ops nfs41_call_sync_ops = {
 634         .rpc_call_prepare = nfs41_call_sync_prepare,
 635         .rpc_call_done = nfs41_call_sync_done,
 636 };
 637
 638 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 639         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 640         .rpc_call_done = nfs41_call_sync_done,
 641 };
 642
 643 static int nfs4_call_sync_sequence(struct nfs_server *server,
 644                                    struct rpc_message *msg,
 645                                    struct nfs4_sequence_args *args,
 646                                    struct nfs4_sequence_res *res,
 647                                    int cache_reply,
 648                                    int privileged)
 649 {
 650         int ret;
 651         struct rpc_task *task;
 652         struct nfs41_call_sync_data data = {
 653                 .seq_server = server,
 654                 .seq_args = args,
 655                 .seq_res = res,
 656                 .cache_reply = cache_reply,
 657         };
 658         struct rpc_task_setup task_setup = {
 659                 .rpc_client = server->client,
 660                 .rpc_message = msg,
 661                 .callback_ops = &nfs41_call_sync_ops,
 662                 .callback_data = &data
 663         };
 664
 665         res->sr_slot = NULL;
 666         if (privileged)
 667                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 668         task = rpc_run_task(&task_setup);
 669         if (IS_ERR(task))
 670                 ret = PTR_ERR(task);
 671         else {
 672                 ret = task->tk_status;
 673                 rpc_put_task(task);
 674         }
 675         return ret;
 676 }
 677
 678 int _nfs4_call_sync_session(struct nfs_server *server,
 679                             struct rpc_message *msg,
 680                             struct nfs4_sequence_args *args,
 681                             struct nfs4_sequence_res *res,
 682                             int cache_reply)
 683 {
 684         return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
 685 }
 686
 687 #else
 688 static int nfs4_sequence_done(struct rpc_task *task,
 689                                struct nfs4_sequence_res *res)
 690 {
 691         return 1;
 692 }
 693 #endif /* CONFIG_NFS_V4_1 */
 694
 695 int _nfs4_call_sync(struct nfs_server *server,
 696                     struct rpc_message *msg,
 697                     struct nfs4_sequence_args *args,
 698                     struct nfs4_sequence_res *res,
 699                     int cache_reply)
 700 {
 701         args->sa_session = res->sr_session = NULL;
 702         return rpc_call_sync(server->client, msg, 0);
 703 }
 704
 705 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 706         (server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
 707                         &(res)->seq_res, (cache_reply))
 708
 709 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 710 {
 711         struct nfs_inode *nfsi = NFS_I(dir);
 712
 713         spin_lock(&dir->i_lock);
 714         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 715         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 716                 nfs_force_lookup_revalidate(dir);
 717         nfsi->change_attr = cinfo->after;
 718         spin_unlock(&dir->i_lock);
 719 }
 720
 721 struct nfs4_opendata {
 722         struct kref kref;
 723         struct nfs_openargs o_arg;
 724         struct nfs_openres o_res;
 725         struct nfs_open_confirmargs c_arg;
 726         struct nfs_open_confirmres c_res;
 727         struct nfs_fattr f_attr;
 728         struct nfs_fattr dir_attr;
 729         struct path path;
 730         struct dentry *dir;
 731         struct nfs4_state_owner *owner;
 732         struct nfs4_state *state;
 733         struct iattr attrs;
 734         unsigned long timestamp;
 735         unsigned int rpc_done : 1;
 736         int rpc_status;
 737         int cancelled;
 738 };
 739
 740
 741 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 742 {
 743         p->o_res.f_attr = &p->f_attr;
 744         p->o_res.dir_attr = &p->dir_attr;
 745         p->o_res.seqid = p->o_arg.seqid;
 746         p->c_res.seqid = p->c_arg.seqid;
 747         p->o_res.server = p->o_arg.server;
 748         nfs_fattr_init(&p->f_attr);
 749         nfs_fattr_init(&p->dir_attr);
 750 }
 751
 752 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 753                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 754                 const struct iattr *attrs,
 755                 gfp_t gfp_mask)
 756 {
 757         struct dentry *parent = dget_parent(path->dentry);
 758         struct inode *dir = parent->d_inode;
 759         struct nfs_server *server = NFS_SERVER(dir);
 760         struct nfs4_opendata *p;
 761
 762         p = kzalloc(sizeof(*p), gfp_mask);
 763         if (p == NULL)
 764                 goto err;
 765         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 766         if (p->o_arg.seqid == NULL)
 767                 goto err_free;
 768         path_get(path);
 769         p->path = *path;
 770         p->dir = parent;
 771         p->owner = sp;
 772         atomic_inc(&sp->so_count);
 773         p->o_arg.fh = NFS_FH(dir);
 774         p->o_arg.open_flags = flags;
 775         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 776         p->o_arg.clientid = server->nfs_client->cl_clientid;
 777         p->o_arg.id = sp->so_owner_id.id;
 778         p->o_arg.name = &p->path.dentry->d_name;
 779         p->o_arg.server = server;
 780         p->o_arg.bitmask = server->attr_bitmask;
 781         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 782         if (flags & O_CREAT) {
 783                 u32 *s;
 784
 785                 p->o_arg.u.attrs = &p->attrs;
 786                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 787                 s = (u32 *) p->o_arg.u.verifier.data;
 788                 s[0] = jiffies;
 789                 s[1] = current->pid;
 790         }
 791         p->c_arg.fh = &p->o_res.fh;
 792         p->c_arg.stateid = &p->o_res.stateid;
 793         p->c_arg.seqid = p->o_arg.seqid;
 794         nfs4_init_opendata_res(p);
 795         kref_init(&p->kref);
 796         return p;
 797 err_free:
 798         kfree(p);
 799 err:
 800         dput(parent);
 801         return NULL;
 802 }
 803
 804 static void nfs4_opendata_free(struct kref *kref)
 805 {
 806         struct nfs4_opendata *p = container_of(kref,
 807                         struct nfs4_opendata, kref);
 808
 809         nfs_free_seqid(p->o_arg.seqid);
 810         if (p->state != NULL)
 811                 nfs4_put_open_state(p->state);
 812         nfs4_put_state_owner(p->owner);
 813         dput(p->dir);
 814         path_put(&p->path);
 815         kfree(p);
 816 }
 817
 818 static void nfs4_opendata_put(struct nfs4_opendata *p)
 819 {
 820         if (p != NULL)
 821                 kref_put(&p->kref, nfs4_opendata_free);
 822 }
 823
 824 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 825 {
 826         int ret;
 827
 828         ret = rpc_wait_for_completion_task(task);
 829         return ret;
 830 }
 831
 832 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 833 {
 834         int ret = 0;
 835
 836         if (open_mode & O_EXCL)
 837                 goto out;
 838         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 839                 case FMODE_READ:
 840                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 841                                 && state->n_rdonly != 0;
 842                         break;
 843                 case FMODE_WRITE:
 844                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 845                                 && state->n_wronly != 0;
 846                         break;
 847                 case FMODE_READ|FMODE_WRITE:
 848                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 849                                 && state->n_rdwr != 0;
 850         }
 851 out:
 852         return ret;
 853 }
 854
 855 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 856 {
 857         if ((delegation->type & fmode) != fmode)
 858                 return 0;
 859         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 860                 return 0;
 861         nfs_mark_delegation_referenced(delegation);
 862         return 1;
 863 }
 864
 865 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 866 {
 867         switch (fmode) {
 868                 case FMODE_WRITE:
 869                         state->n_wronly++;
 870                         break;
 871                 case FMODE_READ:
 872                         state->n_rdonly++;
 873                         break;
 874                 case FMODE_READ|FMODE_WRITE:
 875                         state->n_rdwr++;
 876         }
 877         nfs4_state_set_mode_locked(state, state->state | fmode);
 878 }
 879
 880 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 881 {
 882         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 883                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 884         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 885         switch (fmode) {
 886                 case FMODE_READ:
 887                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 888                         break;
 889                 case FMODE_WRITE:
 890                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 891                         break;
 892                 case FMODE_READ|FMODE_WRITE:
 893                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 894         }
 895 }
 896
 897 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 898 {
 899         write_seqlock(&state->seqlock);
 900         nfs_set_open_stateid_locked(state, stateid, fmode);
 901         write_sequnlock(&state->seqlock);
 902 }
 903
 904 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 905 {
 906         /*
 907          * Protect the call to nfs4_state_set_mode_locked and
 908          * serialise the stateid update
 909          */
 910         write_seqlock(&state->seqlock);
 911         if (deleg_stateid != NULL) {
 912                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 913                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 914         }
 915         if (open_stateid != NULL)
 916                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 917         write_sequnlock(&state->seqlock);
 918         spin_lock(&state->owner->so_lock);
 919         update_open_stateflags(state, fmode);
 920         spin_unlock(&state->owner->so_lock);
 921 }
 922
 923 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 924 {
 925         struct nfs_inode *nfsi = NFS_I(state->inode);
 926         struct nfs_delegation *deleg_cur;
 927         int ret = 0;
 928
 929         fmode &= (FMODE_READ|FMODE_WRITE);
 930
 931         rcu_read_lock();
 932         deleg_cur = rcu_dereference(nfsi->delegation);
 933         if (deleg_cur == NULL)
 934                 goto no_delegation;
 935
 936         spin_lock(&deleg_cur->lock);
 937         if (nfsi->delegation != deleg_cur ||
 938             (deleg_cur->type & fmode) != fmode)
 939                 goto no_delegation_unlock;
 940
 941         if (delegation == NULL)
 942                 delegation = &deleg_cur->stateid;
 943         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 944                 goto no_delegation_unlock;
 945
 946         nfs_mark_delegation_referenced(deleg_cur);
 947         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 948         ret = 1;
 949 no_delegation_unlock:
 950         spin_unlock(&deleg_cur->lock);
 951 no_delegation:
 952         rcu_read_unlock();
 953
 954         if (!ret && open_stateid != NULL) {
 955                 __update_open_stateid(state, open_stateid, NULL, fmode);
 956                 ret = 1;
 957         }
 958
 959         return ret;
 960 }
 961
 962
 963 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 964 {
 965         struct nfs_delegation *delegation;
 966
 967         rcu_read_lock();
 968         delegation = rcu_dereference(NFS_I(inode)->delegation);
 969         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 970                 rcu_read_unlock();
 971                 return;
 972         }
 973         rcu_read_unlock();
 974         nfs_inode_return_delegation(inode);
 975 }
 976
 977 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 978 {
 979         struct nfs4_state *state = opendata->state;
 980         struct nfs_inode *nfsi = NFS_I(state->inode);
 981         struct nfs_delegation *delegation;
 982         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 983         fmode_t fmode = opendata->o_arg.fmode;
 984         nfs4_stateid stateid;
 985         int ret = -EAGAIN;
 986
 987         for (;;) {
 988                 if (can_open_cached(state, fmode, open_mode)) {
 989                         spin_lock(&state->owner->so_lock);
 990                         if (can_open_cached(state, fmode, open_mode)) {
 991                                 update_open_stateflags(state, fmode);
 992                                 spin_unlock(&state->owner->so_lock);
 993                                 goto out_return_state;
 994                         }
 995                         spin_unlock(&state->owner->so_lock);
 996                 }
 997                 rcu_read_lock();
 998                 delegation = rcu_dereference(nfsi->delegation);
 999                 if (delegation == NULL ||
1000                     !can_open_delegated(delegation, fmode)) {
1001                         rcu_read_unlock();
1002                         break;
1003                 }
1004                 /* Save the delegation */
1005                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
1006                 rcu_read_unlock();
1007                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1008                 if (ret != 0)
1009                         goto out;
1010                 ret = -EAGAIN;
1011
1012                 /* Try to update the stateid using the delegation */
1013                 if (update_open_stateid(state, NULL, &stateid, fmode))
1014                         goto out_return_state;
1015         }
1016 out:
1017         return ERR_PTR(ret);
1018 out_return_state:
1019         atomic_inc(&state->count);
1020         return state;
1021 }
1022
1023 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1024 {
1025         struct inode *inode;
1026         struct nfs4_state *state = NULL;
1027         struct nfs_delegation *delegation;
1028         int ret;
1029
1030         if (!data->rpc_done) {
1031                 state = nfs4_try_open_cached(data);
1032                 goto out;
1033         }
1034
1035         ret = -EAGAIN;
1036         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1037                 goto err;
1038         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1039         ret = PTR_ERR(inode);
1040         if (IS_ERR(inode))
1041                 goto err;
1042         ret = -ENOMEM;
1043         state = nfs4_get_open_state(inode, data->owner);
1044         if (state == NULL)
1045                 goto err_put_inode;
1046         if (data->o_res.delegation_type != 0) {
1047                 int delegation_flags = 0;
1048
1049                 rcu_read_lock();
1050                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1051                 if (delegation)
1052                         delegation_flags = delegation->flags;
1053                 rcu_read_unlock();
1054                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1055                         nfs_inode_set_delegation(state->inode,
1056                                         data->owner->so_cred,
1057                                         &data->o_res);
1058                 else
1059                         nfs_inode_reclaim_delegation(state->inode,
1060                                         data->owner->so_cred,
1061                                         &data->o_res);
1062         }
1063
1064         update_open_stateid(state, &data->o_res.stateid, NULL,
1065                         data->o_arg.fmode);
1066         iput(inode);
1067 out:
1068         return state;
1069 err_put_inode:
1070         iput(inode);
1071 err:
1072         return ERR_PTR(ret);
1073 }
1074
1075 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1076 {
1077         struct nfs_inode *nfsi = NFS_I(state->inode);
1078         struct nfs_open_context *ctx;
1079
1080         spin_lock(&state->inode->i_lock);
1081         list_for_each_entry(ctx, &nfsi->open_files, list) {
1082                 if (ctx->state != state)
1083                         continue;
1084                 get_nfs_open_context(ctx);
1085                 spin_unlock(&state->inode->i_lock);
1086                 return ctx;
1087         }
1088         spin_unlock(&state->inode->i_lock);
1089         return ERR_PTR(-ENOENT);
1090 }
1091
1092 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1093 {
1094         struct nfs4_opendata *opendata;
1095
1096         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1097         if (opendata == NULL)
1098                 return ERR_PTR(-ENOMEM);
1099         opendata->state = state;
1100         atomic_inc(&state->count);
1101         return opendata;
1102 }
1103
1104 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1105 {
1106         struct nfs4_state *newstate;
1107         int ret;
1108
1109         opendata->o_arg.open_flags = 0;
1110         opendata->o_arg.fmode = fmode;
1111         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1112         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1113         nfs4_init_opendata_res(opendata);
1114         ret = _nfs4_recover_proc_open(opendata);
1115         if (ret != 0)
1116                 return ret;
1117         newstate = nfs4_opendata_to_nfs4_state(opendata);
1118         if (IS_ERR(newstate))
1119                 return PTR_ERR(newstate);
1120         nfs4_close_state(&opendata->path, newstate, fmode);
1121         *res = newstate;
1122         return 0;
1123 }
1124
1125 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1126 {
1127         struct nfs4_state *newstate;
1128         int ret;
1129
1130         /* memory barrier prior to reading state->n_* */
1131         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1132         smp_rmb();
1133         if (state->n_rdwr != 0) {
1134                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1135                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1136                 if (ret != 0)
1137                         return ret;
1138                 if (newstate != state)
1139                         return -ESTALE;
1140         }
1141         if (state->n_wronly != 0) {
1142                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1143                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1144                 if (ret != 0)
1145                         return ret;
1146                 if (newstate != state)
1147                         return -ESTALE;
1148         }
1149         if (state->n_rdonly != 0) {
1150                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1151                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1152                 if (ret != 0)
1153                         return ret;
1154                 if (newstate != state)
1155                         return -ESTALE;
1156         }
1157         /*
1158          * We may have performed cached opens for all three recoveries.
1159          * Check if we need to update the current stateid.
1160          */
1161         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1162             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1163                 write_seqlock(&state->seqlock);
1164                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1165                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1166                 write_sequnlock(&state->seqlock);
1167         }
1168         return 0;
1169 }
1170
1171 /*
1172  * OPEN_RECLAIM:
1173  *      reclaim state on the server after a reboot.
1174  */
1175 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1176 {
1177         struct nfs_delegation *delegation;
1178         struct nfs4_opendata *opendata;
1179         fmode_t delegation_type = 0;
1180         int status;
1181
1182         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1183         if (IS_ERR(opendata))
1184                 return PTR_ERR(opendata);
1185         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1186         opendata->o_arg.fh = NFS_FH(state->inode);
1187         rcu_read_lock();
1188         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1189         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1190                 delegation_type = delegation->type;
1191         rcu_read_unlock();
1192         opendata->o_arg.u.delegation_type = delegation_type;
1193         status = nfs4_open_recover(opendata, state);
1194         nfs4_opendata_put(opendata);
1195         return status;
1196 }
1197
1198 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1199 {
1200         struct nfs_server *server = NFS_SERVER(state->inode);
1201         struct nfs4_exception exception = { };
1202         int err;
1203         do {
1204                 err = _nfs4_do_open_reclaim(ctx, state);
1205                 if (err != -NFS4ERR_DELAY)
1206                         break;
1207                 nfs4_handle_exception(server, err, &exception);
1208         } while (exception.retry);
1209         return err;
1210 }
1211
1212 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1213 {
1214         struct nfs_open_context *ctx;
1215         int ret;
1216
1217         ctx = nfs4_state_find_open_context(state);
1218         if (IS_ERR(ctx))
1219                 return PTR_ERR(ctx);
1220         ret = nfs4_do_open_reclaim(ctx, state);
1221         put_nfs_open_context(ctx);
1222         return ret;
1223 }
1224
1225 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1226 {
1227         struct nfs4_opendata *opendata;
1228         int ret;
1229
1230         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1231         if (IS_ERR(opendata))
1232                 return PTR_ERR(opendata);
1233         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1234         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1235                         sizeof(opendata->o_arg.u.delegation.data));
1236         ret = nfs4_open_recover(opendata, state);
1237         nfs4_opendata_put(opendata);
1238         return ret;
1239 }
1240
1241 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1242 {
1243         struct nfs4_exception exception = { };
1244         struct nfs_server *server = NFS_SERVER(state->inode);
1245         int err;
1246         do {
1247                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1248                 switch (err) {
1249                         case 0:
1250                         case -ENOENT:
1251                         case -ESTALE:
1252                                 goto out;
1253                         case -NFS4ERR_BADSESSION:
1254                         case -NFS4ERR_BADSLOT:
1255                         case -NFS4ERR_BAD_HIGH_SLOT:
1256                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1257                         case -NFS4ERR_DEADSESSION:
1258                                 nfs4_schedule_state_recovery(
1259                                         server->nfs_client);
1260                                 goto out;
1261                         case -NFS4ERR_STALE_CLIENTID:
1262                         case -NFS4ERR_STALE_STATEID:
1263                         case -NFS4ERR_EXPIRED:
1264                                 /* Don't recall a delegation if it was lost */
1265                                 nfs4_schedule_state_recovery(server->nfs_client);
1266                                 goto out;
1267                         case -ERESTARTSYS:
1268                                 /*
1269                                  * The show must go on: exit, but mark the
1270                                  * stateid as needing recovery.
1271                                  */
1272                         case -NFS4ERR_ADMIN_REVOKED:
1273                         case -NFS4ERR_BAD_STATEID:
1274                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1275                         case -EKEYEXPIRED:
1276                                 /*
1277                                  * User RPCSEC_GSS context has expired.
1278                                  * We cannot recover this stateid now, so
1279                                  * skip it and allow recovery thread to
1280                                  * proceed.
1281                                  */
1282                         case -ENOMEM:
1283                                 err = 0;
1284                                 goto out;
1285                 }
1286                 err = nfs4_handle_exception(server, err, &exception);
1287         } while (exception.retry);
1288 out:
1289         return err;
1290 }
1291
1292 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1293 {
1294         struct nfs4_opendata *data = calldata;
1295
1296         data->rpc_status = task->tk_status;
1297         if (data->rpc_status == 0) {
1298                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1299                                 sizeof(data->o_res.stateid.data));
1300                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1301                 renew_lease(data->o_res.server, data->timestamp);
1302                 data->rpc_done = 1;
1303         }
1304 }
1305
1306 static void nfs4_open_confirm_release(void *calldata)
1307 {
1308         struct nfs4_opendata *data = calldata;
1309         struct nfs4_state *state = NULL;
1310
1311         /* If this request hasn't been cancelled, do nothing */
1312         if (data->cancelled == 0)
1313                 goto out_free;
1314         /* In case of error, no cleanup! */
1315         if (!data->rpc_done)
1316                 goto out_free;
1317         state = nfs4_opendata_to_nfs4_state(data);
1318         if (!IS_ERR(state))
1319                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1320 out_free:
1321         nfs4_opendata_put(data);
1322 }
1323
1324 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1325         .rpc_call_done = nfs4_open_confirm_done,
1326         .rpc_release = nfs4_open_confirm_release,
1327 };
1328
1329 /*
1330  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1331  */
1332 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1333 {
1334         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1335         struct rpc_task *task;
1336         struct  rpc_message msg = {
1337                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1338                 .rpc_argp = &data->c_arg,
1339                 .rpc_resp = &data->c_res,
1340                 .rpc_cred = data->owner->so_cred,
1341         };
1342         struct rpc_task_setup task_setup_data = {
1343                 .rpc_client = server->client,
1344                 .rpc_message = &msg,
1345                 .callback_ops = &nfs4_open_confirm_ops,
1346                 .callback_data = data,
1347                 .workqueue = nfsiod_workqueue,
1348                 .flags = RPC_TASK_ASYNC,
1349         };
1350         int status;
1351
1352         kref_get(&data->kref);
1353         data->rpc_done = 0;
1354         data->rpc_status = 0;
1355         data->timestamp = jiffies;
1356         task = rpc_run_task(&task_setup_data);
1357         if (IS_ERR(task))
1358                 return PTR_ERR(task);
1359         status = nfs4_wait_for_completion_rpc_task(task);
1360         if (status != 0) {
1361                 data->cancelled = 1;
1362                 smp_wmb();
1363         } else
1364                 status = data->rpc_status;
1365         rpc_put_task(task);
1366         return status;
1367 }
1368
1369 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1370 {
1371         struct nfs4_opendata *data = calldata;
1372         struct nfs4_state_owner *sp = data->owner;
1373
1374         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1375                 return;
1376         /*
1377          * Check if we still need to send an OPEN call, or if we can use
1378          * a delegation instead.
1379          */
1380         if (data->state != NULL) {
1381                 struct nfs_delegation *delegation;
1382
1383                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1384                         goto out_no_action;
1385                 rcu_read_lock();
1386                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1387                 if (delegation != NULL &&
1388                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1389                         rcu_read_unlock();
1390                         goto out_no_action;
1391                 }
1392                 rcu_read_unlock();
1393         }
1394         /* Update sequence id. */
1395         data->o_arg.id = sp->so_owner_id.id;
1396         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1397         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1398                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1399                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1400         }
1401         data->timestamp = jiffies;
1402         if (nfs4_setup_sequence(data->o_arg.server,
1403                                 &data->o_arg.seq_args,
1404                                 &data->o_res.seq_res, 1, task))
1405                 return;
1406         rpc_call_start(task);
1407         return;
1408 out_no_action:
1409         task->tk_action = NULL;
1410
1411 }
1412
1413 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1414 {
1415         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1416         nfs4_open_prepare(task, calldata);
1417 }
1418
1419 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1420 {
1421         struct nfs4_opendata *data = calldata;
1422
1423         data->rpc_status = task->tk_status;
1424
1425         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1426                 return;
1427
1428         if (task->tk_status == 0) {
1429                 switch (data->o_res.f_attr->mode & S_IFMT) {
1430                         case S_IFREG:
1431                                 break;
1432                         case S_IFLNK:
1433                                 data->rpc_status = -ELOOP;
1434                                 break;
1435                         case S_IFDIR:
1436                                 data->rpc_status = -EISDIR;
1437                                 break;
1438                         default:
1439                                 data->rpc_status = -ENOTDIR;
1440                 }
1441                 renew_lease(data->o_res.server, data->timestamp);
1442                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1443                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1444         }
1445         data->rpc_done = 1;
1446 }
1447
1448 static void nfs4_open_release(void *calldata)
1449 {
1450         struct nfs4_opendata *data = calldata;
1451         struct nfs4_state *state = NULL;
1452
1453         /* If this request hasn't been cancelled, do nothing */
1454         if (data->cancelled == 0)
1455                 goto out_free;
1456         /* In case of error, no cleanup! */
1457         if (data->rpc_status != 0 || !data->rpc_done)
1458                 goto out_free;
1459         /* In case we need an open_confirm, no cleanup! */
1460         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1461                 goto out_free;
1462         state = nfs4_opendata_to_nfs4_state(data);
1463         if (!IS_ERR(state))
1464                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1465 out_free:
1466         nfs4_opendata_put(data);
1467 }
1468
1469 static const struct rpc_call_ops nfs4_open_ops = {
1470         .rpc_call_prepare = nfs4_open_prepare,
1471         .rpc_call_done = nfs4_open_done,
1472         .rpc_release = nfs4_open_release,
1473 };
1474
1475 static const struct rpc_call_ops nfs4_recover_open_ops = {
1476         .rpc_call_prepare = nfs4_recover_open_prepare,
1477         .rpc_call_done = nfs4_open_done,
1478         .rpc_release = nfs4_open_release,
1479 };
1480
1481 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1482 {
1483         struct inode *dir = data->dir->d_inode;
1484         struct nfs_server *server = NFS_SERVER(dir);
1485         struct nfs_openargs *o_arg = &data->o_arg;
1486         struct nfs_openres *o_res = &data->o_res;
1487         struct rpc_task *task;
1488         struct rpc_message msg = {
1489                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1490                 .rpc_argp = o_arg,
1491                 .rpc_resp = o_res,
1492                 .rpc_cred = data->owner->so_cred,
1493         };
1494         struct rpc_task_setup task_setup_data = {
1495                 .rpc_client = server->client,
1496                 .rpc_message = &msg,
1497                 .callback_ops = &nfs4_open_ops,
1498                 .callback_data = data,
1499                 .workqueue = nfsiod_workqueue,
1500                 .flags = RPC_TASK_ASYNC,
1501         };
1502         int status;
1503
1504         kref_get(&data->kref);
1505         data->rpc_done = 0;
1506         data->rpc_status = 0;
1507         data->cancelled = 0;
1508         if (isrecover)
1509                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1510         task = rpc_run_task(&task_setup_data);
1511         if (IS_ERR(task))
1512                 return PTR_ERR(task);
1513         status = nfs4_wait_for_completion_rpc_task(task);
1514         if (status != 0) {
1515                 data->cancelled = 1;
1516                 smp_wmb();
1517         } else
1518                 status = data->rpc_status;
1519         rpc_put_task(task);
1520
1521         return status;
1522 }
1523
1524 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1525 {
1526         struct inode *dir = data->dir->d_inode;
1527         struct nfs_openres *o_res = &data->o_res;
1528         int status;
1529
1530         status = nfs4_run_open_task(data, 1);
1531         if (status != 0 || !data->rpc_done)
1532                 return status;
1533
1534         nfs_refresh_inode(dir, o_res->dir_attr);
1535
1536         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1537                 status = _nfs4_proc_open_confirm(data);
1538                 if (status != 0)
1539                         return status;
1540         }
1541
1542         return status;
1543 }
1544
1545 /*
1546  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1547  */
1548 static int _nfs4_proc_open(struct nfs4_opendata *data)
1549 {
1550         struct inode *dir = data->dir->d_inode;
1551         struct nfs_server *server = NFS_SERVER(dir);
1552         struct nfs_openargs *o_arg = &data->o_arg;
1553         struct nfs_openres *o_res = &data->o_res;
1554         int status;
1555
1556         status = nfs4_run_open_task(data, 0);
1557         if (status != 0 || !data->rpc_done)
1558                 return status;
1559
1560         if (o_arg->open_flags & O_CREAT) {
1561                 update_changeattr(dir, &o_res->cinfo);
1562                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1563         } else
1564                 nfs_refresh_inode(dir, o_res->dir_attr);
1565         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1566                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1567         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1568                 status = _nfs4_proc_open_confirm(data);
1569                 if (status != 0)
1570                         return status;
1571         }
1572         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1573                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1574         return 0;
1575 }
1576
1577 static int nfs4_recover_expired_lease(struct nfs_server *server)
1578 {
1579         struct nfs_client *clp = server->nfs_client;
1580         unsigned int loop;
1581         int ret;
1582
1583         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1584                 ret = nfs4_wait_clnt_recover(clp);
1585                 if (ret != 0)
1586                         break;
1587                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1588                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1589                         break;
1590                 nfs4_schedule_state_recovery(clp);
1591                 ret = -EIO;
1592         }
1593         return ret;
1594 }
1595
1596 /*
1597  * OPEN_EXPIRED:
1598  *      reclaim state on the server after a network partition.
1599  *      Assumes caller holds the appropriate lock
1600  */
1601 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1602 {
1603         struct nfs4_opendata *opendata;
1604         int ret;
1605
1606         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1607         if (IS_ERR(opendata))
1608                 return PTR_ERR(opendata);
1609         ret = nfs4_open_recover(opendata, state);
1610         if (ret == -ESTALE)
1611                 d_drop(ctx->path.dentry);
1612         nfs4_opendata_put(opendata);
1613         return ret;
1614 }
1615
1616 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1617 {
1618         struct nfs_server *server = NFS_SERVER(state->inode);
1619         struct nfs4_exception exception = { };
1620         int err;
1621
1622         do {
1623                 err = _nfs4_open_expired(ctx, state);
1624                 switch (err) {
1625                 default:
1626                         goto out;
1627                 case -NFS4ERR_GRACE:
1628                 case -NFS4ERR_DELAY:
1629                         nfs4_handle_exception(server, err, &exception);
1630                         err = 0;
1631                 }
1632         } while (exception.retry);
1633 out:
1634         return err;
1635 }
1636
1637 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1638 {
1639         struct nfs_open_context *ctx;
1640         int ret;
1641
1642         ctx = nfs4_state_find_open_context(state);
1643         if (IS_ERR(ctx))
1644                 return PTR_ERR(ctx);
1645         ret = nfs4_do_open_expired(ctx, state);
1646         put_nfs_open_context(ctx);
1647         return ret;
1648 }
1649
1650 /*
1651  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1652  * fields corresponding to attributes that were used to store the verifier.
1653  * Make sure we clobber those fields in the later setattr call
1654  */
1655 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1656 {
1657         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1658             !(sattr->ia_valid & ATTR_ATIME_SET))
1659                 sattr->ia_valid |= ATTR_ATIME;
1660
1661         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1662             !(sattr->ia_valid & ATTR_MTIME_SET))
1663                 sattr->ia_valid |= ATTR_MTIME;
1664 }
1665
1666 /*
1667  * Returns a referenced nfs4_state
1668  */
1669 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)
1670 {
1671         struct nfs4_state_owner  *sp;
1672         struct nfs4_state     *state = NULL;
1673         struct nfs_server       *server = NFS_SERVER(dir);
1674         struct nfs4_opendata *opendata;
1675         int status;
1676
1677         /* Protect against reboot recovery conflicts */
1678         status = -ENOMEM;
1679         if (!(sp = nfs4_get_state_owner(server, cred))) {
1680                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1681                 goto out_err;
1682         }
1683         status = nfs4_recover_expired_lease(server);
1684         if (status != 0)
1685                 goto err_put_state_owner;
1686         if (path->dentry->d_inode != NULL)
1687                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1688         status = -ENOMEM;
1689         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1690         if (opendata == NULL)
1691                 goto err_put_state_owner;
1692
1693         if (path->dentry->d_inode != NULL)
1694                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1695
1696         status = _nfs4_proc_open(opendata);
1697         if (status != 0)
1698                 goto err_opendata_put;
1699
1700         state = nfs4_opendata_to_nfs4_state(opendata);
1701         status = PTR_ERR(state);
1702         if (IS_ERR(state))
1703                 goto err_opendata_put;
1704         if (server->caps & NFS_CAP_POSIX_LOCK)
1705                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1706
1707         if (opendata->o_arg.open_flags & O_EXCL) {
1708                 nfs4_exclusive_attrset(opendata, sattr);
1709
1710                 nfs_fattr_init(opendata->o_res.f_attr);
1711                 status = nfs4_do_setattr(state->inode, cred,
1712                                 opendata->o_res.f_attr, sattr,
1713                                 state);
1714                 if (status == 0)
1715                         nfs_setattr_update_inode(state->inode, sattr);
1716                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1717         }
1718         nfs4_opendata_put(opendata);
1719         nfs4_put_state_owner(sp);
1720         *res = state;
1721         return 0;
1722 err_opendata_put:
1723         nfs4_opendata_put(opendata);
1724 err_put_state_owner:
1725         nfs4_put_state_owner(sp);
1726 out_err:
1727         *res = NULL;
1728         return status;
1729 }
1730
1731
1732 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)
1733 {
1734         struct nfs4_exception exception = { };
1735         struct nfs4_state *res;
1736         int status;
1737
1738         do {
1739                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1740                 if (status == 0)
1741                         break;
1742                 /* NOTE: BAD_SEQID means the server and client disagree about the
1743                  * book-keeping w.r.t. state-changing operations
1744                  * (OPEN/CLOSE/LOCK/LOCKU...)
1745                  * It is actually a sign of a bug on the client or on the server.
1746                  *
1747                  * If we receive a BAD_SEQID error in the particular case of
1748                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1749                  * have unhashed the old state_owner for us, and that we can
1750                  * therefore safely retry using a new one. We should still warn
1751                  * the user though...
1752                  */
1753                 if (status == -NFS4ERR_BAD_SEQID) {
1754                         printk(KERN_WARNING "NFS: v4 server %s "
1755                                         " returned a bad sequence-id error!\n",
1756                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1757                         exception.retry = 1;
1758                         continue;
1759                 }
1760                 /*
1761                  * BAD_STATEID on OPEN means that the server cancelled our
1762                  * state before it received the OPEN_CONFIRM.
1763                  * Recover by retrying the request as per the discussion
1764                  * on Page 181 of RFC3530.
1765                  */
1766                 if (status == -NFS4ERR_BAD_STATEID) {
1767                         exception.retry = 1;
1768                         continue;
1769                 }
1770                 if (status == -EAGAIN) {
1771                         /* We must have found a delegation */
1772                         exception.retry = 1;
1773                         continue;
1774                 }
1775                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1776                                         status, &exception));
1777         } while (exception.retry);
1778         return res;
1779 }
1780
1781 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1782                             struct nfs_fattr *fattr, struct iattr *sattr,
1783                             struct nfs4_state *state)
1784 {
1785         struct nfs_server *server = NFS_SERVER(inode);
1786         struct nfs_setattrargs  arg = {
1787                 .fh             = NFS_FH(inode),
1788                 .iap            = sattr,
1789                 .server         = server,
1790                 .bitmask = server->attr_bitmask,
1791         };
1792         struct nfs_setattrres  res = {
1793                 .fattr          = fattr,
1794                 .server         = server,
1795         };
1796         struct rpc_message msg = {
1797                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1798                 .rpc_argp       = &arg,
1799                 .rpc_resp       = &res,
1800                 .rpc_cred       = cred,
1801         };
1802         unsigned long timestamp = jiffies;
1803         int status;
1804
1805         nfs_fattr_init(fattr);
1806
1807         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1808                 /* Use that stateid */
1809         } else if (state != NULL) {
1810                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1811         } else
1812                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1813
1814         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1815         if (status == 0 && state != NULL)
1816                 renew_lease(server, timestamp);
1817         return status;
1818 }
1819
1820 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1821                            struct nfs_fattr *fattr, struct iattr *sattr,
1822                            struct nfs4_state *state)
1823 {
1824         struct nfs_server *server = NFS_SERVER(inode);
1825         struct nfs4_exception exception = { };
1826         int err;
1827         do {
1828                 err = nfs4_handle_exception(server,
1829                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1830                                 &exception);
1831         } while (exception.retry);
1832         return err;
1833 }
1834
1835 struct nfs4_closedata {
1836         struct path path;
1837         struct inode *inode;
1838         struct nfs4_state *state;
1839         struct nfs_closeargs arg;
1840         struct nfs_closeres res;
1841         struct nfs_fattr fattr;
1842         unsigned long timestamp;
1843         bool roc;
1844         u32 roc_barrier;
1845 };
1846
1847 static void nfs4_free_closedata(void *data)
1848 {
1849         struct nfs4_closedata *calldata = data;
1850         struct nfs4_state_owner *sp = calldata->state->owner;
1851
1852         if (calldata->roc)
1853                 pnfs_roc_release(calldata->state->inode);
1854         nfs4_put_open_state(calldata->state);
1855         nfs_free_seqid(calldata->arg.seqid);
1856         nfs4_put_state_owner(sp);
1857         path_put(&calldata->path);
1858         kfree(calldata);
1859 }
1860
1861 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1862                 fmode_t fmode)
1863 {
1864         spin_lock(&state->owner->so_lock);
1865         if (!(fmode & FMODE_READ))
1866                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1867         if (!(fmode & FMODE_WRITE))
1868                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1869         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1870         spin_unlock(&state->owner->so_lock);
1871 }
1872
1873 static void nfs4_close_done(struct rpc_task *task, void *data)
1874 {
1875         struct nfs4_closedata *calldata = data;
1876         struct nfs4_state *state = calldata->state;
1877         struct nfs_server *server = NFS_SERVER(calldata->inode);
1878
1879         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1880                 return;
1881         /* hmm. we are done with the inode, and in the process of freeing
1882          * the state_owner. we keep this around to process errors
1883          */
1884         switch (task->tk_status) {
1885                 case 0:
1886                         if (calldata->roc)
1887                                 pnfs_roc_set_barrier(state->inode,
1888                                                      calldata->roc_barrier);
1889                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1890                         renew_lease(server, calldata->timestamp);
1891                         nfs4_close_clear_stateid_flags(state,
1892                                         calldata->arg.fmode);
1893                         break;
1894                 case -NFS4ERR_STALE_STATEID:
1895                 case -NFS4ERR_OLD_STATEID:
1896                 case -NFS4ERR_BAD_STATEID:
1897                 case -NFS4ERR_EXPIRED:
1898                         if (calldata->arg.fmode == 0)
1899                                 break;
1900                 default:
1901                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1902                                 rpc_restart_call_prepare(task);
1903         }
1904         nfs_release_seqid(calldata->arg.seqid);
1905         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1906 }
1907
1908 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1909 {
1910         struct nfs4_closedata *calldata = data;
1911         struct nfs4_state *state = calldata->state;
1912         int call_close = 0;
1913
1914         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1915                 return;
1916
1917         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1918         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1919         spin_lock(&state->owner->so_lock);
1920         /* Calculate the change in open mode */
1921         if (state->n_rdwr == 0) {
1922                 if (state->n_rdonly == 0) {
1923                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1924                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1925                         calldata->arg.fmode &= ~FMODE_READ;
1926                 }
1927                 if (state->n_wronly == 0) {
1928                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1929                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1930                         calldata->arg.fmode &= ~FMODE_WRITE;
1931                 }
1932         }
1933         spin_unlock(&state->owner->so_lock);
1934
1935         if (!call_close) {
1936                 /* Note: exit _without_ calling nfs4_close_done */
1937                 task->tk_action = NULL;
1938                 return;
1939         }
1940
1941         if (calldata->arg.fmode == 0) {
1942                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1943                 if (calldata->roc &&
1944                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
1945                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
1946                                      task, NULL);
1947                         return;
1948                 }
1949         }
1950
1951         nfs_fattr_init(calldata->res.fattr);
1952         calldata->timestamp = jiffies;
1953         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1954                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1955                                 1, task))
1956                 return;
1957         rpc_call_start(task);
1958 }
1959
1960 static const struct rpc_call_ops nfs4_close_ops = {
1961         .rpc_call_prepare = nfs4_close_prepare,
1962         .rpc_call_done = nfs4_close_done,
1963         .rpc_release = nfs4_free_closedata,
1964 };
1965
1966 /*
1967  * It is possible for data to be read/written from a mem-mapped file
1968  * after the sys_close call (which hits the vfs layer as a flush).
1969  * This means that we can't safely call nfsv4 close on a file until
1970  * the inode is cleared. This in turn means that we are not good
1971  * NFSv4 citizens - we do not indicate to the server to update the file's
1972  * share state even when we are done with one of the three share
1973  * stateid's in the inode.
1974  *
1975  * NOTE: Caller must be holding the sp->so_owner semaphore!
1976  */
1977 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
1978 {
1979         struct nfs_server *server = NFS_SERVER(state->inode);
1980         struct nfs4_closedata *calldata;
1981         struct nfs4_state_owner *sp = state->owner;
1982         struct rpc_task *task;
1983         struct rpc_message msg = {
1984                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1985                 .rpc_cred = state->owner->so_cred,
1986         };
1987         struct rpc_task_setup task_setup_data = {
1988                 .rpc_client = server->client,
1989                 .rpc_message = &msg,
1990                 .callback_ops = &nfs4_close_ops,
1991                 .workqueue = nfsiod_workqueue,
1992                 .flags = RPC_TASK_ASYNC,
1993         };
1994         int status = -ENOMEM;
1995
1996         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1997         if (calldata == NULL)
1998                 goto out;
1999         calldata->inode = state->inode;
2000         calldata->state = state;
2001         calldata->arg.fh = NFS_FH(state->inode);
2002         calldata->arg.stateid = &state->open_stateid;
2003         /* Serialization for the sequence id */
2004         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2005         if (calldata->arg.seqid == NULL)
2006                 goto out_free_calldata;
2007         calldata->arg.fmode = 0;
2008         calldata->arg.bitmask = server->cache_consistency_bitmask;
2009         calldata->res.fattr = &calldata->fattr;
2010         calldata->res.seqid = calldata->arg.seqid;
2011         calldata->res.server = server;
2012         calldata->roc = roc;
2013         path_get(path);
2014         calldata->path = *path;
2015
2016         msg.rpc_argp = &calldata->arg;
2017         msg.rpc_resp = &calldata->res;
2018         task_setup_data.callback_data = calldata;
2019         task = rpc_run_task(&task_setup_data);
2020         if (IS_ERR(task))
2021                 return PTR_ERR(task);
2022         status = 0;
2023         if (wait)
2024                 status = rpc_wait_for_completion_task(task);
2025         rpc_put_task(task);
2026         return status;
2027 out_free_calldata:
2028         kfree(calldata);
2029 out:
2030         if (roc)
2031                 pnfs_roc_release(state->inode);
2032         nfs4_put_open_state(state);
2033         nfs4_put_state_owner(sp);
2034         return status;
2035 }
2036
2037 static struct inode *
2038 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2039 {
2040         struct nfs4_state *state;
2041
2042         /* Protect against concurrent sillydeletes */
2043         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2044         if (IS_ERR(state))
2045                 return ERR_CAST(state);
2046         ctx->state = state;
2047         return igrab(state->inode);
2048 }
2049
2050 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2051 {
2052         if (ctx->state == NULL)
2053                 return;
2054         if (is_sync)
2055                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2056         else
2057                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2058 }
2059
2060 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2061 {
2062         struct nfs4_server_caps_arg args = {
2063                 .fhandle = fhandle,
2064         };
2065         struct nfs4_server_caps_res res = {};
2066         struct rpc_message msg = {
2067                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2068                 .rpc_argp = &args,
2069                 .rpc_resp = &res,
2070         };
2071         int status;
2072
2073         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2074         if (status == 0) {
2075                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2076                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2077                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2078                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2079                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2080                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2081                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2082                         server->caps |= NFS_CAP_ACLS;
2083                 if (res.has_links != 0)
2084                         server->caps |= NFS_CAP_HARDLINKS;
2085                 if (res.has_symlinks != 0)
2086                         server->caps |= NFS_CAP_SYMLINKS;
2087                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2088                         server->caps |= NFS_CAP_FILEID;
2089                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2090                         server->caps |= NFS_CAP_MODE;
2091                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2092                         server->caps |= NFS_CAP_NLINK;
2093                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2094                         server->caps |= NFS_CAP_OWNER;
2095                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2096                         server->caps |= NFS_CAP_OWNER_GROUP;
2097                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2098                         server->caps |= NFS_CAP_ATIME;
2099                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2100                         server->caps |= NFS_CAP_CTIME;
2101                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2102                         server->caps |= NFS_CAP_MTIME;
2103
2104                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2105                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2106                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2107                 server->acl_bitmask = res.acl_bitmask;
2108         }
2109
2110         return status;
2111 }
2112
2113 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2114 {
2115         struct nfs4_exception exception = { };
2116         int err;
2117         do {
2118                 err = nfs4_handle_exception(server,
2119                                 _nfs4_server_capabilities(server, fhandle),
2120                                 &exception);
2121         } while (exception.retry);
2122         return err;
2123 }
2124
2125 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2126                 struct nfs_fsinfo *info)
2127 {
2128         struct nfs4_lookup_root_arg args = {
2129                 .bitmask = nfs4_fattr_bitmap,
2130         };
2131         struct nfs4_lookup_res res = {
2132                 .server = server,
2133                 .fattr = info->fattr,
2134                 .fh = fhandle,
2135         };
2136         struct rpc_message msg = {
2137                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2138                 .rpc_argp = &args,
2139                 .rpc_resp = &res,
2140         };
2141
2142         nfs_fattr_init(info->fattr);
2143         return nfs4_call_sync(server, &msg, &args, &res, 0);
2144 }
2145
2146 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2147                 struct nfs_fsinfo *info)
2148 {
2149         struct nfs4_exception exception = { };
2150         int err;
2151         do {
2152                 err = nfs4_handle_exception(server,
2153                                 _nfs4_lookup_root(server, fhandle, info),
2154                                 &exception);
2155         } while (exception.retry);
2156         return err;
2157 }
2158
2159 /*
2160  * get the file handle for the "/" directory on the server
2161  */
2162 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2163                               struct nfs_fsinfo *info)
2164 {
2165         int status;
2166
2167         status = nfs4_lookup_root(server, fhandle, info);
2168         if (status == 0)
2169                 status = nfs4_server_capabilities(server, fhandle);
2170         if (status == 0)
2171                 status = nfs4_do_fsinfo(server, fhandle, info);
2172         return nfs4_map_errors(status);
2173 }
2174
2175 /*
2176  * Get locations and (maybe) other attributes of a referral.
2177  * Note that we'll actually follow the referral later when
2178  * we detect fsid mismatch in inode revalidation
2179  */
2180 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2181 {
2182         int status = -ENOMEM;
2183         struct page *page = NULL;
2184         struct nfs4_fs_locations *locations = NULL;
2185
2186         page = alloc_page(GFP_KERNEL);
2187         if (page == NULL)
2188                 goto out;
2189         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2190         if (locations == NULL)
2191                 goto out;
2192
2193         status = nfs4_proc_fs_locations(dir, name, locations, page);
2194         if (status != 0)
2195                 goto out;
2196         /* Make sure server returned a different fsid for the referral */
2197         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2198                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2199                 status = -EIO;
2200                 goto out;
2201         }
2202
2203         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2204         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2205         if (!fattr->mode)
2206                 fattr->mode = S_IFDIR;
2207         memset(fhandle, 0, sizeof(struct nfs_fh));
2208 out:
2209         if (page)
2210                 __free_page(page);
2211         kfree(locations);
2212         return status;
2213 }
2214
2215 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2216 {
2217         struct nfs4_getattr_arg args = {
2218                 .fh = fhandle,
2219                 .bitmask = server->attr_bitmask,
2220         };
2221         struct nfs4_getattr_res res = {
2222                 .fattr = fattr,
2223                 .server = server,
2224         };
2225         struct rpc_message msg = {
2226                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2227                 .rpc_argp = &args,
2228                 .rpc_resp = &res,
2229         };
2230
2231         nfs_fattr_init(fattr);
2232         return nfs4_call_sync(server, &msg, &args, &res, 0);
2233 }
2234
2235 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2236 {
2237         struct nfs4_exception exception = { };
2238         int err;
2239         do {
2240                 err = nfs4_handle_exception(server,
2241                                 _nfs4_proc_getattr(server, fhandle, fattr),
2242                                 &exception);
2243         } while (exception.retry);
2244         return err;
2245 }
2246
2247 /*
2248  * The file is not closed if it is opened due to the a request to change
2249  * the size of the file. The open call will not be needed once the
2250  * VFS layer lookup-intents are implemented.
2251  *
2252  * Close is called when the inode is destroyed.
2253  * If we haven't opened the file for O_WRONLY, we
2254  * need to in the size_change case to obtain a stateid.
2255  *
2256  * Got race?
2257  * Because OPEN is always done by name in nfsv4, it is
2258  * possible that we opened a different file by the same
2259  * name.  We can recognize this race condition, but we
2260  * can't do anything about it besides returning an error.
2261  *
2262  * This will be fixed with VFS changes (lookup-intent).
2263  */
2264 static int
2265 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2266                   struct iattr *sattr)
2267 {
2268         struct inode *inode = dentry->d_inode;
2269         struct rpc_cred *cred = NULL;
2270         struct nfs4_state *state = NULL;
2271         int status;
2272
2273         nfs_fattr_init(fattr);
2274
2275         /* Search for an existing open(O_WRITE) file */
2276         if (sattr->ia_valid & ATTR_FILE) {
2277                 struct nfs_open_context *ctx;
2278
2279                 ctx = nfs_file_open_context(sattr->ia_file);
2280                 if (ctx) {
2281                         cred = ctx->cred;
2282                         state = ctx->state;
2283                 }
2284         }
2285
2286         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2287         if (status == 0)
2288                 nfs_setattr_update_inode(inode, sattr);
2289         return status;
2290 }
2291
2292 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2293                 const struct qstr *name, struct nfs_fh *fhandle,
2294                 struct nfs_fattr *fattr)
2295 {
2296         int                    status;
2297         struct nfs4_lookup_arg args = {
2298                 .bitmask = server->attr_bitmask,
2299                 .dir_fh = dirfh,
2300                 .name = name,
2301         };
2302         struct nfs4_lookup_res res = {
2303                 .server = server,
2304                 .fattr = fattr,
2305                 .fh = fhandle,
2306         };
2307         struct rpc_message msg = {
2308                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2309                 .rpc_argp = &args,
2310                 .rpc_resp = &res,
2311         };
2312
2313         nfs_fattr_init(fattr);
2314
2315         dprintk("NFS call  lookupfh %s\n", name->name);
2316         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2317         dprintk("NFS reply lookupfh: %d\n", status);
2318         return status;
2319 }
2320
2321 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2322                               struct qstr *name, struct nfs_fh *fhandle,
2323                               struct nfs_fattr *fattr)
2324 {
2325         struct nfs4_exception exception = { };
2326         int err;
2327         do {
2328                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2329                 /* FIXME: !!!! */
2330                 if (err == -NFS4ERR_MOVED) {
2331                         err = -EREMOTE;
2332                         break;
2333                 }
2334                 err = nfs4_handle_exception(server, err, &exception);
2335         } while (exception.retry);
2336         return err;
2337 }
2338
2339 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2340                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2341 {
2342         int status;
2343
2344         dprintk("NFS call  lookup %s\n", name->name);
2345         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2346         if (status == -NFS4ERR_MOVED)
2347                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2348         dprintk("NFS reply lookup: %d\n", status);
2349         return status;
2350 }
2351
2352 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2353 {
2354         struct nfs4_exception exception = { };
2355         int err;
2356         do {
2357                 err = nfs4_handle_exception(NFS_SERVER(dir),
2358                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2359                                 &exception);
2360         } while (exception.retry);
2361         return err;
2362 }
2363
2364 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2365 {
2366         struct nfs_server *server = NFS_SERVER(inode);
2367         struct nfs4_accessargs args = {
2368                 .fh = NFS_FH(inode),
2369                 .bitmask = server->attr_bitmask,
2370         };
2371         struct nfs4_accessres res = {
2372                 .server = server,
2373         };
2374         struct rpc_message msg = {
2375                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2376                 .rpc_argp = &args,
2377                 .rpc_resp = &res,
2378                 .rpc_cred = entry->cred,
2379         };
2380         int mode = entry->mask;
2381         int status;
2382
2383         /*
2384          * Determine which access bits we want to ask for...
2385          */
2386         if (mode & MAY_READ)
2387                 args.access |= NFS4_ACCESS_READ;
2388         if (S_ISDIR(inode->i_mode)) {
2389                 if (mode & MAY_WRITE)
2390                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2391                 if (mode & MAY_EXEC)
2392                         args.access |= NFS4_ACCESS_LOOKUP;
2393         } else {
2394                 if (mode & MAY_WRITE)
2395                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2396                 if (mode & MAY_EXEC)
2397                         args.access |= NFS4_ACCESS_EXECUTE;
2398         }
2399
2400         res.fattr = nfs_alloc_fattr();
2401         if (res.fattr == NULL)
2402                 return -ENOMEM;
2403
2404         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2405         if (!status) {
2406                 entry->mask = 0;
2407                 if (res.access & NFS4_ACCESS_READ)
2408                         entry->mask |= MAY_READ;
2409                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2410                         entry->mask |= MAY_WRITE;
2411                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2412                         entry->mask |= MAY_EXEC;
2413                 nfs_refresh_inode(inode, res.fattr);
2414         }
2415         nfs_free_fattr(res.fattr);
2416         return status;
2417 }
2418
2419 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2420 {
2421         struct nfs4_exception exception = { };
2422         int err;
2423         do {
2424                 err = nfs4_handle_exception(NFS_SERVER(inode),
2425                                 _nfs4_proc_access(inode, entry),
2426                                 &exception);
2427         } while (exception.retry);
2428         return err;
2429 }
2430
2431 /*
2432  * TODO: For the time being, we don't try to get any attributes
2433  * along with any of the zero-copy operations READ, READDIR,
2434  * READLINK, WRITE.
2435  *
2436  * In the case of the first three, we want to put the GETATTR
2437  * after the read-type operation -- this is because it is hard
2438  * to predict the length of a GETATTR response in v4, and thus
2439  * align the READ data correctly.  This means that the GETATTR
2440  * may end up partially falling into the page cache, and we should
2441  * shift it into the 'tail' of the xdr_buf before processing.
2442  * To do this efficiently, we need to know the total length
2443  * of data received, which doesn't seem to be available outside
2444  * of the RPC layer.
2445  *
2446  * In the case of WRITE, we also want to put the GETATTR after
2447  * the operation -- in this case because we want to make sure
2448  * we get the post-operation mtime and size.  This means that
2449  * we can't use xdr_encode_pages() as written: we need a variant
2450  * of it which would leave room in the 'tail' iovec.
2451  *
2452  * Both of these changes to the XDR layer would in fact be quite
2453  * minor, but I decided to leave them for a subsequent patch.
2454  */
2455 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2456                 unsigned int pgbase, unsigned int pglen)
2457 {
2458         struct nfs4_readlink args = {
2459                 .fh       = NFS_FH(inode),
2460                 .pgbase   = pgbase,
2461                 .pglen    = pglen,
2462                 .pages    = &page,
2463         };
2464         struct nfs4_readlink_res res;
2465         struct rpc_message msg = {
2466                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2467                 .rpc_argp = &args,
2468                 .rpc_resp = &res,
2469         };
2470
2471         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2472 }
2473
2474 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2475                 unsigned int pgbase, unsigned int pglen)
2476 {
2477         struct nfs4_exception exception = { };
2478         int err;
2479         do {
2480                 err = nfs4_handle_exception(NFS_SERVER(inode),
2481                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2482                                 &exception);
2483         } while (exception.retry);
2484         return err;
2485 }
2486
2487 /*
2488  * Got race?
2489  * We will need to arrange for the VFS layer to provide an atomic open.
2490  * Until then, this create/open method is prone to inefficiency and race
2491  * conditions due to the lookup, create, and open VFS calls from sys_open()
2492  * placed on the wire.
2493  *
2494  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2495  * The file will be opened again in the subsequent VFS open call
2496  * (nfs4_proc_file_open).
2497  *
2498  * The open for read will just hang around to be used by any process that
2499  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2500  */
2501
2502 static int
2503 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2504                  int flags, struct nfs_open_context *ctx)
2505 {
2506         struct path my_path = {
2507                 .dentry = dentry,
2508         };
2509         struct path *path = &my_path;
2510         struct nfs4_state *state;
2511         struct rpc_cred *cred = NULL;
2512         fmode_t fmode = 0;
2513         int status = 0;
2514
2515         if (ctx != NULL) {
2516                 cred = ctx->cred;
2517                 path = &ctx->path;
2518                 fmode = ctx->mode;
2519         }
2520         sattr->ia_mode &= ~current_umask();
2521         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2522         d_drop(dentry);
2523         if (IS_ERR(state)) {
2524                 status = PTR_ERR(state);
2525                 goto out;
2526         }
2527         d_add(dentry, igrab(state->inode));
2528         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2529         if (ctx != NULL)
2530                 ctx->state = state;
2531         else
2532                 nfs4_close_sync(path, state, fmode);
2533 out:
2534         return status;
2535 }
2536
2537 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2538 {
2539         struct nfs_server *server = NFS_SERVER(dir);
2540         struct nfs_removeargs args = {
2541                 .fh = NFS_FH(dir),
2542                 .name.len = name->len,
2543                 .name.name = name->name,
2544                 .bitmask = server->attr_bitmask,
2545         };
2546         struct nfs_removeres res = {
2547                 .server = server,
2548         };
2549         struct rpc_message msg = {
2550                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2551                 .rpc_argp = &args,
2552                 .rpc_resp = &res,
2553         };
2554         int status = -ENOMEM;
2555
2556         res.dir_attr = nfs_alloc_fattr();
2557         if (res.dir_attr == NULL)
2558                 goto out;
2559
2560         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2561         if (status == 0) {
2562                 update_changeattr(dir, &res.cinfo);
2563                 nfs_post_op_update_inode(dir, res.dir_attr);
2564         }
2565         nfs_free_fattr(res.dir_attr);
2566 out:
2567         return status;
2568 }
2569
2570 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2571 {
2572         struct nfs4_exception exception = { };
2573         int err;
2574         do {
2575                 err = nfs4_handle_exception(NFS_SERVER(dir),
2576                                 _nfs4_proc_remove(dir, name),
2577                                 &exception);
2578         } while (exception.retry);
2579         return err;
2580 }
2581
2582 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2583 {
2584         struct nfs_server *server = NFS_SERVER(dir);
2585         struct nfs_removeargs *args = msg->rpc_argp;
2586         struct nfs_removeres *res = msg->rpc_resp;
2587
2588         args->bitmask = server->cache_consistency_bitmask;
2589         res->server = server;
2590         res->seq_res.sr_slot = NULL;
2591         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2592 }
2593
2594 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2595 {
2596         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2597
2598         if (!nfs4_sequence_done(task, &res->seq_res))
2599                 return 0;
2600         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2601                 return 0;
2602         update_changeattr(dir, &res->cinfo);
2603         nfs_post_op_update_inode(dir, res->dir_attr);
2604         return 1;
2605 }
2606
2607 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2608 {
2609         struct nfs_server *server = NFS_SERVER(dir);
2610         struct nfs_renameargs *arg = msg->rpc_argp;
2611         struct nfs_renameres *res = msg->rpc_resp;
2612
2613         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2614         arg->bitmask = server->attr_bitmask;
2615         res->server = server;
2616 }
2617
2618 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2619                                  struct inode *new_dir)
2620 {
2621         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2622
2623         if (!nfs4_sequence_done(task, &res->seq_res))
2624                 return 0;
2625         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2626                 return 0;
2627
2628         update_changeattr(old_dir, &res->old_cinfo);
2629         nfs_post_op_update_inode(old_dir, res->old_fattr);
2630         update_changeattr(new_dir, &res->new_cinfo);
2631         nfs_post_op_update_inode(new_dir, res->new_fattr);
2632         return 1;
2633 }
2634
2635 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2636                 struct inode *new_dir, struct qstr *new_name)
2637 {
2638         struct nfs_server *server = NFS_SERVER(old_dir);
2639         struct nfs_renameargs arg = {
2640                 .old_dir = NFS_FH(old_dir),
2641                 .new_dir = NFS_FH(new_dir),
2642                 .old_name = old_name,
2643                 .new_name = new_name,
2644                 .bitmask = server->attr_bitmask,
2645         };
2646         struct nfs_renameres res = {
2647                 .server = server,
2648         };
2649         struct rpc_message msg = {
2650                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2651                 .rpc_argp = &arg,
2652                 .rpc_resp = &res,
2653         };
2654         int status = -ENOMEM;
2655
2656         res.old_fattr = nfs_alloc_fattr();
2657         res.new_fattr = nfs_alloc_fattr();
2658         if (res.old_fattr == NULL || res.new_fattr == NULL)
2659                 goto out;
2660
2661         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2662         if (!status) {
2663                 update_changeattr(old_dir, &res.old_cinfo);
2664                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2665                 update_changeattr(new_dir, &res.new_cinfo);
2666                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2667         }
2668 out:
2669         nfs_free_fattr(res.new_fattr);
2670         nfs_free_fattr(res.old_fattr);
2671         return status;
2672 }
2673
2674 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2675                 struct inode *new_dir, struct qstr *new_name)
2676 {
2677         struct nfs4_exception exception = { };
2678         int err;
2679         do {
2680                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2681                                 _nfs4_proc_rename(old_dir, old_name,
2682                                         new_dir, new_name),
2683                                 &exception);
2684         } while (exception.retry);
2685         return err;
2686 }
2687
2688 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2689 {
2690         struct nfs_server *server = NFS_SERVER(inode);
2691         struct nfs4_link_arg arg = {
2692                 .fh     = NFS_FH(inode),
2693                 .dir_fh = NFS_FH(dir),
2694                 .name   = name,
2695                 .bitmask = server->attr_bitmask,
2696         };
2697         struct nfs4_link_res res = {
2698                 .server = server,
2699         };
2700         struct rpc_message msg = {
2701                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2702                 .rpc_argp = &arg,
2703                 .rpc_resp = &res,
2704         };
2705         int status = -ENOMEM;
2706
2707         res.fattr = nfs_alloc_fattr();
2708         res.dir_attr = nfs_alloc_fattr();
2709         if (res.fattr == NULL || res.dir_attr == NULL)
2710                 goto out;
2711
2712         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2713         if (!status) {
2714                 update_changeattr(dir, &res.cinfo);
2715                 nfs_post_op_update_inode(dir, res.dir_attr);
2716                 nfs_post_op_update_inode(inode, res.fattr);
2717         }
2718 out:
2719         nfs_free_fattr(res.dir_attr);
2720         nfs_free_fattr(res.fattr);
2721         return status;
2722 }
2723
2724 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2725 {
2726         struct nfs4_exception exception = { };
2727         int err;
2728         do {
2729                 err = nfs4_handle_exception(NFS_SERVER(inode),
2730                                 _nfs4_proc_link(inode, dir, name),
2731                                 &exception);
2732         } while (exception.retry);
2733         return err;
2734 }
2735
2736 struct nfs4_createdata {
2737         struct rpc_message msg;
2738         struct nfs4_create_arg arg;
2739         struct nfs4_create_res res;
2740         struct nfs_fh fh;
2741         struct nfs_fattr fattr;
2742         struct nfs_fattr dir_fattr;
2743 };
2744
2745 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2746                 struct qstr *name, struct iattr *sattr, u32 ftype)
2747 {
2748         struct nfs4_createdata *data;
2749
2750         data = kzalloc(sizeof(*data), GFP_KERNEL);
2751         if (data != NULL) {
2752                 struct nfs_server *server = NFS_SERVER(dir);
2753
2754                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2755                 data->msg.rpc_argp = &data->arg;
2756                 data->msg.rpc_resp = &data->res;
2757                 data->arg.dir_fh = NFS_FH(dir);
2758                 data->arg.server = server;
2759                 data->arg.name = name;
2760                 data->arg.attrs = sattr;
2761                 data->arg.ftype = ftype;
2762                 data->arg.bitmask = server->attr_bitmask;
2763                 data->res.server = server;
2764                 data->res.fh = &data->fh;
2765                 data->res.fattr = &data->fattr;
2766                 data->res.dir_fattr = &data->dir_fattr;
2767                 nfs_fattr_init(data->res.fattr);
2768                 nfs_fattr_init(data->res.dir_fattr);
2769         }
2770         return data;
2771 }
2772
2773 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2774 {
2775         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2776                                     &data->arg, &data->res, 1);
2777         if (status == 0) {
2778                 update_changeattr(dir, &data->res.dir_cinfo);
2779                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2780                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2781         }
2782         return status;
2783 }
2784
2785 static void nfs4_free_createdata(struct nfs4_createdata *data)
2786 {
2787         kfree(data);
2788 }
2789
2790 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2791                 struct page *page, unsigned int len, struct iattr *sattr)
2792 {
2793         struct nfs4_createdata *data;
2794         int status = -ENAMETOOLONG;
2795
2796         if (len > NFS4_MAXPATHLEN)
2797                 goto out;
2798
2799         status = -ENOMEM;
2800         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2801         if (data == NULL)
2802                 goto out;
2803
2804         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2805         data->arg.u.symlink.pages = &page;
2806         data->arg.u.symlink.len = len;
2807
2808         status = nfs4_do_create(dir, dentry, data);
2809
2810         nfs4_free_createdata(data);
2811 out:
2812         return status;
2813 }
2814
2815 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2816                 struct page *page, unsigned int len, struct iattr *sattr)
2817 {
2818         struct nfs4_exception exception = { };
2819         int err;
2820         do {
2821                 err = nfs4_handle_exception(NFS_SERVER(dir),
2822                                 _nfs4_proc_symlink(dir, dentry, page,
2823                                                         len, sattr),
2824                                 &exception);
2825         } while (exception.retry);
2826         return err;
2827 }
2828
2829 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2830                 struct iattr *sattr)
2831 {
2832         struct nfs4_createdata *data;
2833         int status = -ENOMEM;
2834
2835         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2836         if (data == NULL)
2837                 goto out;
2838
2839         status = nfs4_do_create(dir, dentry, data);
2840
2841         nfs4_free_createdata(data);
2842 out:
2843         return status;
2844 }
2845
2846 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2847                 struct iattr *sattr)
2848 {
2849         struct nfs4_exception exception = { };
2850         int err;
2851
2852         sattr->ia_mode &= ~current_umask();
2853         do {
2854                 err = nfs4_handle_exception(NFS_SERVER(dir),
2855                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2856                                 &exception);
2857         } while (exception.retry);
2858         return err;
2859 }
2860
2861 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2862                 u64 cookie, struct page **pages, unsigned int count, int plus)
2863 {
2864         struct inode            *dir = dentry->d_inode;
2865         struct nfs4_readdir_arg args = {
2866                 .fh = NFS_FH(dir),
2867                 .pages = pages,
2868                 .pgbase = 0,
2869                 .count = count,
2870                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2871                 .plus = plus,
2872         };
2873         struct nfs4_readdir_res res;
2874         struct rpc_message msg = {
2875                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2876                 .rpc_argp = &args,
2877                 .rpc_resp = &res,
2878                 .rpc_cred = cred,
2879         };
2880         int                     status;
2881
2882         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2883                         dentry->d_parent->d_name.name,
2884                         dentry->d_name.name,
2885                         (unsigned long long)cookie);
2886         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2887         res.pgbase = args.pgbase;
2888         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2889         if (status >= 0) {
2890                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2891                 status += args.pgbase;
2892         }
2893
2894         nfs_invalidate_atime(dir);
2895
2896         dprintk("%s: returns %d\n", __func__, status);
2897         return status;
2898 }
2899
2900 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2901                 u64 cookie, struct page **pages, unsigned int count, int plus)
2902 {
2903         struct nfs4_exception exception = { };
2904         int err;
2905         do {
2906                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2907                                 _nfs4_proc_readdir(dentry, cred, cookie,
2908                                         pages, count, plus),
2909                                 &exception);
2910         } while (exception.retry);
2911         return err;
2912 }
2913
2914 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2915                 struct iattr *sattr, dev_t rdev)
2916 {
2917         struct nfs4_createdata *data;
2918         int mode = sattr->ia_mode;
2919         int status = -ENOMEM;
2920
2921         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2922         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2923
2924         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2925         if (data == NULL)
2926                 goto out;
2927
2928         if (S_ISFIFO(mode))
2929                 data->arg.ftype = NF4FIFO;
2930         else if (S_ISBLK(mode)) {
2931                 data->arg.ftype = NF4BLK;
2932                 data->arg.u.device.specdata1 = MAJOR(rdev);
2933                 data->arg.u.device.specdata2 = MINOR(rdev);
2934         }
2935         else if (S_ISCHR(mode)) {
2936                 data->arg.ftype = NF4CHR;
2937                 data->arg.u.device.specdata1 = MAJOR(rdev);
2938                 data->arg.u.device.specdata2 = MINOR(rdev);
2939         }
2940
2941         status = nfs4_do_create(dir, dentry, data);
2942
2943         nfs4_free_createdata(data);
2944 out:
2945         return status;
2946 }
2947
2948 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2949                 struct iattr *sattr, dev_t rdev)
2950 {
2951         struct nfs4_exception exception = { };
2952         int err;
2953
2954         sattr->ia_mode &= ~current_umask();
2955         do {
2956                 err = nfs4_handle_exception(NFS_SERVER(dir),
2957                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2958                                 &exception);
2959         } while (exception.retry);
2960         return err;
2961 }
2962
2963 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2964                  struct nfs_fsstat *fsstat)
2965 {
2966         struct nfs4_statfs_arg args = {
2967                 .fh = fhandle,
2968                 .bitmask = server->attr_bitmask,
2969         };
2970         struct nfs4_statfs_res res = {
2971                 .fsstat = fsstat,
2972         };
2973         struct rpc_message msg = {
2974                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2975                 .rpc_argp = &args,
2976                 .rpc_resp = &res,
2977         };
2978
2979         nfs_fattr_init(fsstat->fattr);
2980         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2981 }
2982
2983 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2984 {
2985         struct nfs4_exception exception = { };
2986         int err;
2987         do {
2988                 err = nfs4_handle_exception(server,
2989                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2990                                 &exception);
2991         } while (exception.retry);
2992         return err;
2993 }
2994
2995 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2996                 struct nfs_fsinfo *fsinfo)
2997 {
2998         struct nfs4_fsinfo_arg args = {
2999                 .fh = fhandle,
3000                 .bitmask = server->attr_bitmask,
3001         };
3002         struct nfs4_fsinfo_res res = {
3003                 .fsinfo = fsinfo,
3004         };
3005         struct rpc_message msg = {
3006                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3007                 .rpc_argp = &args,
3008                 .rpc_resp = &res,
3009         };
3010
3011         return nfs4_call_sync(server, &msg, &args, &res, 0);
3012 }
3013
3014 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3015 {
3016         struct nfs4_exception exception = { };
3017         int err;
3018
3019         do {
3020                 err = nfs4_handle_exception(server,
3021                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3022                                 &exception);
3023         } while (exception.retry);
3024         return err;
3025 }
3026
3027 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3028 {
3029         nfs_fattr_init(fsinfo->fattr);
3030         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3031 }
3032
3033 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3034                 struct nfs_pathconf *pathconf)
3035 {
3036         struct nfs4_pathconf_arg args = {
3037                 .fh = fhandle,
3038                 .bitmask = server->attr_bitmask,
3039         };
3040         struct nfs4_pathconf_res res = {
3041                 .pathconf = pathconf,
3042         };
3043         struct rpc_message msg = {
3044                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3045                 .rpc_argp = &args,
3046                 .rpc_resp = &res,
3047         };
3048
3049         /* None of the pathconf attributes are mandatory to implement */
3050         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3051                 memset(pathconf, 0, sizeof(*pathconf));
3052                 return 0;
3053         }
3054
3055         nfs_fattr_init(pathconf->fattr);
3056         return nfs4_call_sync(server, &msg, &args, &res, 0);
3057 }
3058
3059 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3060                 struct nfs_pathconf *pathconf)
3061 {
3062         struct nfs4_exception exception = { };
3063         int err;
3064
3065         do {
3066                 err = nfs4_handle_exception(server,
3067                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3068                                 &exception);
3069         } while (exception.retry);
3070         return err;
3071 }
3072
3073 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3074 {
3075         struct nfs_server *server = NFS_SERVER(data->inode);
3076
3077         dprintk("--> %s\n", __func__);
3078
3079         if (!nfs4_sequence_done(task, &data->res.seq_res))
3080                 return -EAGAIN;
3081
3082         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3083                 nfs_restart_rpc(task, server->nfs_client);
3084                 return -EAGAIN;
3085         }
3086
3087         nfs_invalidate_atime(data->inode);
3088         if (task->tk_status > 0)
3089                 renew_lease(server, data->timestamp);
3090         return 0;
3091 }
3092
3093 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3094 {
3095         data->timestamp   = jiffies;
3096         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3097 }
3098
3099 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3100 {
3101         struct inode *inode = data->inode;
3102
3103         if (!nfs4_sequence_done(task, &data->res.seq_res))
3104                 return -EAGAIN;
3105
3106         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3107                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3108                 return -EAGAIN;
3109         }
3110         if (task->tk_status >= 0) {
3111                 renew_lease(NFS_SERVER(inode), data->timestamp);
3112                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3113         }
3114         return 0;
3115 }
3116
3117 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3118 {
3119         struct nfs_server *server = NFS_SERVER(data->inode);
3120
3121         data->args.bitmask = server->cache_consistency_bitmask;
3122         data->res.server = server;
3123         data->timestamp   = jiffies;
3124
3125         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3126 }
3127
3128 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3129 {
3130         struct inode *inode = data->inode;
3131
3132         if (!nfs4_sequence_done(task, &data->res.seq_res))
3133                 return -EAGAIN;
3134
3135         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3136                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3137                 return -EAGAIN;
3138         }
3139         nfs_refresh_inode(inode, data->res.fattr);
3140         return 0;
3141 }
3142
3143 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3144 {
3145         struct nfs_server *server = NFS_SERVER(data->inode);
3146
3147         data->args.bitmask = server->cache_consistency_bitmask;
3148         data->res.server = server;
3149         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3150 }
3151
3152 struct nfs4_renewdata {
3153         struct nfs_client       *client;
3154         unsigned long           timestamp;
3155 };
3156
3157 /*
3158  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3159  * standalone procedure for queueing an asynchronous RENEW.
3160  */
3161 static void nfs4_renew_release(void *calldata)
3162 {
3163         struct nfs4_renewdata *data = calldata;
3164         struct nfs_client *clp = data->client;
3165
3166         if (atomic_read(&clp->cl_count) > 1)
3167                 nfs4_schedule_state_renewal(clp);
3168         nfs_put_client(clp);
3169         kfree(data);
3170 }
3171
3172 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3173 {
3174         struct nfs4_renewdata *data = calldata;
3175         struct nfs_client *clp = data->client;
3176         unsigned long timestamp = data->timestamp;
3177
3178         if (task->tk_status < 0) {
3179                 /* Unless we're shutting down, schedule state recovery! */
3180                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3181                         nfs4_schedule_state_recovery(clp);
3182                 return;
3183         }
3184         do_renew_lease(clp, timestamp);
3185 }
3186
3187 static const struct rpc_call_ops nfs4_renew_ops = {
3188         .rpc_call_done = nfs4_renew_done,
3189         .rpc_release = nfs4_renew_release,
3190 };
3191
3192 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3193 {
3194         struct rpc_message msg = {
3195                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3196                 .rpc_argp       = clp,
3197                 .rpc_cred       = cred,
3198         };
3199         struct nfs4_renewdata *data;
3200
3201         if (!atomic_inc_not_zero(&clp->cl_count))
3202                 return -EIO;
3203         data = kmalloc(sizeof(*data), GFP_KERNEL);
3204         if (data == NULL)
3205                 return -ENOMEM;
3206         data->client = clp;
3207         data->timestamp = jiffies;
3208         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3209                         &nfs4_renew_ops, data);
3210 }
3211
3212 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3213 {
3214         struct rpc_message msg = {
3215                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3216                 .rpc_argp       = clp,
3217                 .rpc_cred       = cred,
3218         };
3219         unsigned long now = jiffies;
3220         int status;
3221
3222         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3223         if (status < 0)
3224                 return status;
3225         do_renew_lease(clp, now);
3226         return 0;
3227 }
3228
3229 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3230 {
3231         return (server->caps & NFS_CAP_ACLS)
3232                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3233                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3234 }
3235
3236 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3237  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3238  * the stack.
3239  */
3240 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3241
3242 static void buf_to_pages(const void *buf, size_t buflen,
3243                 struct page **pages, unsigned int *pgbase)
3244 {
3245         const void *p = buf;
3246
3247         *pgbase = offset_in_page(buf);
3248         p -= *pgbase;
3249         while (p < buf + buflen) {
3250                 *(pages++) = virt_to_page(p);
3251                 p += PAGE_CACHE_SIZE;
3252         }
3253 }
3254
3255 struct nfs4_cached_acl {
3256         int cached;
3257         size_t len;
3258         char data[0];
3259 };
3260
3261 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3262 {
3263         struct nfs_inode *nfsi = NFS_I(inode);
3264
3265         spin_lock(&inode->i_lock);
3266         kfree(nfsi->nfs4_acl);
3267         nfsi->nfs4_acl = acl;
3268         spin_unlock(&inode->i_lock);
3269 }
3270
3271 static void nfs4_zap_acl_attr(struct inode *inode)
3272 {
3273         nfs4_set_cached_acl(inode, NULL);
3274 }
3275
3276 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3277 {
3278         struct nfs_inode *nfsi = NFS_I(inode);
3279         struct nfs4_cached_acl *acl;
3280         int ret = -ENOENT;
3281
3282         spin_lock(&inode->i_lock);
3283         acl = nfsi->nfs4_acl;
3284         if (acl == NULL)
3285                 goto out;
3286         if (buf == NULL) /* user is just asking for length */
3287                 goto out_len;
3288         if (acl->cached == 0)
3289                 goto out;
3290         ret = -ERANGE; /* see getxattr(2) man page */
3291         if (acl->len > buflen)
3292                 goto out;
3293         memcpy(buf, acl->data, acl->len);
3294 out_len:
3295         ret = acl->len;
3296 out:
3297         spin_unlock(&inode->i_lock);
3298         return ret;
3299 }
3300
3301 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3302 {
3303         struct nfs4_cached_acl *acl;
3304
3305         if (buf && acl_len <= PAGE_SIZE) {
3306                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3307                 if (acl == NULL)
3308                         goto out;
3309                 acl->cached = 1;
3310                 memcpy(acl->data, buf, acl_len);
3311         } else {
3312                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3313                 if (acl == NULL)
3314                         goto out;
3315                 acl->cached = 0;
3316         }
3317         acl->len = acl_len;
3318 out:
3319         nfs4_set_cached_acl(inode, acl);
3320 }
3321
3322 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3323 {
3324         struct page *pages[NFS4ACL_MAXPAGES];
3325         struct nfs_getaclargs args = {
3326                 .fh = NFS_FH(inode),
3327                 .acl_pages = pages,
3328                 .acl_len = buflen,
3329         };
3330         struct nfs_getaclres res = {
3331                 .acl_len = buflen,
3332         };
3333         void *resp_buf;
3334         struct rpc_message msg = {
3335                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3336                 .rpc_argp = &args,
3337                 .rpc_resp = &res,
3338         };
3339         struct page *localpage = NULL;
3340         int ret;
3341
3342         if (buflen < PAGE_SIZE) {
3343                 /* As long as we're doing a round trip to the server anyway,
3344                  * let's be prepared for a page of acl data. */
3345                 localpage = alloc_page(GFP_KERNEL);
3346                 resp_buf = page_address(localpage);
3347                 if (localpage == NULL)
3348                         return -ENOMEM;
3349                 args.acl_pages[0] = localpage;
3350                 args.acl_pgbase = 0;
3351                 args.acl_len = PAGE_SIZE;
3352         } else {
3353                 resp_buf = buf;
3354                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3355         }
3356         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3357         if (ret)
3358                 goto out_free;
3359         if (res.acl_len > args.acl_len)
3360                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3361         else
3362                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3363         if (buf) {
3364                 ret = -ERANGE;
3365                 if (res.acl_len > buflen)
3366                         goto out_free;
3367                 if (localpage)
3368                         memcpy(buf, resp_buf, res.acl_len);
3369         }
3370         ret = res.acl_len;
3371 out_free:
3372         if (localpage)
3373                 __free_page(localpage);
3374         return ret;
3375 }
3376
3377 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3378 {
3379         struct nfs4_exception exception = { };
3380         ssize_t ret;
3381         do {
3382                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3383                 if (ret >= 0)
3384                         break;
3385                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3386         } while (exception.retry);
3387         return ret;
3388 }
3389
3390 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3391 {
3392         struct nfs_server *server = NFS_SERVER(inode);
3393         int ret;
3394
3395         if (!nfs4_server_supports_acls(server))
3396                 return -EOPNOTSUPP;
3397         ret = nfs_revalidate_inode(server, inode);
3398         if (ret < 0)
3399                 return ret;
3400         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3401                 nfs_zap_acl_cache(inode);
3402         ret = nfs4_read_cached_acl(inode, buf, buflen);
3403         if (ret != -ENOENT)
3404                 return ret;
3405         return nfs4_get_acl_uncached(inode, buf, buflen);
3406 }
3407
3408 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3409 {
3410         struct nfs_server *server = NFS_SERVER(inode);
3411         struct page *pages[NFS4ACL_MAXPAGES];
3412         struct nfs_setaclargs arg = {
3413                 .fh             = NFS_FH(inode),
3414                 .acl_pages      = pages,
3415                 .acl_len        = buflen,
3416         };
3417         struct nfs_setaclres res;
3418         struct rpc_message msg = {
3419                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3420                 .rpc_argp       = &arg,
3421                 .rpc_resp       = &res,
3422         };
3423         int ret;
3424
3425         if (!nfs4_server_supports_acls(server))
3426                 return -EOPNOTSUPP;
3427         nfs_inode_return_delegation(inode);
3428         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3429         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3430         /*
3431          * Acl update can result in inode attribute update.
3432          * so mark the attribute cache invalid.
3433          */
3434         spin_lock(&inode->i_lock);
3435         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3436         spin_unlock(&inode->i_lock);
3437         nfs_access_zap_cache(inode);
3438         nfs_zap_acl_cache(inode);
3439         return ret;
3440 }
3441
3442 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3443 {
3444         struct nfs4_exception exception = { };
3445         int err;
3446         do {
3447                 err = nfs4_handle_exception(NFS_SERVER(inode),
3448                                 __nfs4_proc_set_acl(inode, buf, buflen),
3449                                 &exception);
3450         } while (exception.retry);
3451         return err;
3452 }
3453
3454 static int
3455 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3456 {
3457         struct nfs_client *clp = server->nfs_client;
3458
3459         if (task->tk_status >= 0)
3460                 return 0;
3461         switch(task->tk_status) {
3462                 case -NFS4ERR_ADMIN_REVOKED:
3463                 case -NFS4ERR_BAD_STATEID:
3464                 case -NFS4ERR_OPENMODE:
3465                         if (state == NULL)
3466                                 break;
3467                         nfs4_state_mark_reclaim_nograce(clp, state);
3468                         goto do_state_recovery;
3469                 case -NFS4ERR_STALE_STATEID:
3470                 case -NFS4ERR_STALE_CLIENTID:
3471                 case -NFS4ERR_EXPIRED:
3472                         goto do_state_recovery;
3473 #if defined(CONFIG_NFS_V4_1)
3474                 case -NFS4ERR_BADSESSION:
3475                 case -NFS4ERR_BADSLOT:
3476                 case -NFS4ERR_BAD_HIGH_SLOT:
3477                 case -NFS4ERR_DEADSESSION:
3478                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3479                 case -NFS4ERR_SEQ_FALSE_RETRY:
3480                 case -NFS4ERR_SEQ_MISORDERED:
3481                         dprintk("%s ERROR %d, Reset session\n", __func__,
3482                                 task->tk_status);
3483                         nfs4_schedule_state_recovery(clp);
3484                         task->tk_status = 0;
3485                         return -EAGAIN;
3486 #endif /* CONFIG_NFS_V4_1 */
3487                 case -NFS4ERR_DELAY:
3488                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3489                 case -NFS4ERR_GRACE:
3490                 case -EKEYEXPIRED:
3491                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3492                         task->tk_status = 0;
3493                         return -EAGAIN;
3494                 case -NFS4ERR_OLD_STATEID:
3495                         task->tk_status = 0;
3496                         return -EAGAIN;
3497         }
3498         task->tk_status = nfs4_map_errors(task->tk_status);
3499         return 0;
3500 do_state_recovery:
3501         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3502         nfs4_schedule_state_recovery(clp);
3503         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3504                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3505         task->tk_status = 0;
3506         return -EAGAIN;
3507 }
3508
3509 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3510                 unsigned short port, struct rpc_cred *cred,
3511                 struct nfs4_setclientid_res *res)
3512 {
3513         nfs4_verifier sc_verifier;
3514         struct nfs4_setclientid setclientid = {
3515                 .sc_verifier = &sc_verifier,
3516                 .sc_prog = program,
3517                 .sc_cb_ident = clp->cl_cb_ident,
3518         };
3519         struct rpc_message msg = {
3520                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3521                 .rpc_argp = &setclientid,
3522                 .rpc_resp = res,
3523                 .rpc_cred = cred,
3524         };
3525         __be32 *p;
3526         int loop = 0;
3527         int status;
3528
3529         p = (__be32*)sc_verifier.data;
3530         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3531         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3532
3533         for(;;) {
3534                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3535                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3536                                 clp->cl_ipaddr,
3537                                 rpc_peeraddr2str(clp->cl_rpcclient,
3538                                                         RPC_DISPLAY_ADDR),
3539                                 rpc_peeraddr2str(clp->cl_rpcclient,
3540                                                         RPC_DISPLAY_PROTO),
3541                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3542                                 clp->cl_id_uniquifier);
3543                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3544                                 sizeof(setclientid.sc_netid),
3545                                 rpc_peeraddr2str(clp->cl_rpcclient,
3546                                                         RPC_DISPLAY_NETID));
3547                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3548                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3549                                 clp->cl_ipaddr, port >> 8, port & 255);
3550
3551                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3552                 if (status != -NFS4ERR_CLID_INUSE)
3553                         break;
3554                 if (signalled())
3555                         break;
3556                 if (loop++ & 1)
3557                         ssleep(clp->cl_lease_time / HZ + 1);
3558                 else
3559                         if (++clp->cl_id_uniquifier == 0)
3560                                 break;
3561         }
3562         return status;
3563 }
3564
3565 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3566                 struct nfs4_setclientid_res *arg,
3567                 struct rpc_cred *cred)
3568 {
3569         struct nfs_fsinfo fsinfo;
3570         struct rpc_message msg = {
3571                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3572                 .rpc_argp = arg,
3573                 .rpc_resp = &fsinfo,
3574                 .rpc_cred = cred,
3575         };
3576         unsigned long now;
3577         int status;
3578
3579         now = jiffies;
3580         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3581         if (status == 0) {
3582                 spin_lock(&clp->cl_lock);
3583                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3584                 clp->cl_last_renewal = now;
3585                 spin_unlock(&clp->cl_lock);
3586         }
3587         return status;
3588 }
3589
3590 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3591                 struct nfs4_setclientid_res *arg,
3592                 struct rpc_cred *cred)
3593 {
3594         long timeout = 0;
3595         int err;
3596         do {
3597                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3598                 switch (err) {
3599                         case 0:
3600                                 return err;
3601                         case -NFS4ERR_RESOURCE:
3602                                 /* The IBM lawyers misread another document! */
3603                         case -NFS4ERR_DELAY:
3604                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3605                 }
3606         } while (err == 0);
3607         return err;
3608 }
3609
3610 struct nfs4_delegreturndata {
3611         struct nfs4_delegreturnargs args;
3612         struct nfs4_delegreturnres res;
3613         struct nfs_fh fh;
3614         nfs4_stateid stateid;
3615         unsigned long timestamp;
3616         struct nfs_fattr fattr;
3617         int rpc_status;
3618 };
3619
3620 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3621 {
3622         struct nfs4_delegreturndata *data = calldata;
3623
3624         if (!nfs4_sequence_done(task, &data->res.seq_res))
3625                 return;
3626
3627         switch (task->tk_status) {
3628         case -NFS4ERR_STALE_STATEID:
3629         case -NFS4ERR_EXPIRED:
3630         case 0:
3631                 renew_lease(data->res.server, data->timestamp);
3632                 break;
3633         default:
3634                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3635                                 -EAGAIN) {
3636                         nfs_restart_rpc(task, data->res.server->nfs_client);
3637                         return;
3638                 }
3639         }
3640         data->rpc_status = task->tk_status;
3641 }
3642
3643 static void nfs4_delegreturn_release(void *calldata)
3644 {
3645         kfree(calldata);
3646 }
3647
3648 #if defined(CONFIG_NFS_V4_1)
3649 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3650 {
3651         struct nfs4_delegreturndata *d_data;
3652
3653         d_data = (struct nfs4_delegreturndata *)data;
3654
3655         if (nfs4_setup_sequence(d_data->res.server,
3656                                 &d_data->args.seq_args,
3657                                 &d_data->res.seq_res, 1, task))
3658                 return;
3659         rpc_call_start(task);
3660 }
3661 #endif /* CONFIG_NFS_V4_1 */
3662
3663 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3664 #if defined(CONFIG_NFS_V4_1)
3665         .rpc_call_prepare = nfs4_delegreturn_prepare,
3666 #endif /* CONFIG_NFS_V4_1 */
3667         .rpc_call_done = nfs4_delegreturn_done,
3668         .rpc_release = nfs4_delegreturn_release,
3669 };
3670
3671 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3672 {
3673         struct nfs4_delegreturndata *data;
3674         struct nfs_server *server = NFS_SERVER(inode);
3675         struct rpc_task *task;
3676         struct rpc_message msg = {
3677                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3678                 .rpc_cred = cred,
3679         };
3680         struct rpc_task_setup task_setup_data = {
3681                 .rpc_client = server->client,
3682                 .rpc_message = &msg,
3683                 .callback_ops = &nfs4_delegreturn_ops,
3684                 .flags = RPC_TASK_ASYNC,
3685         };
3686         int status = 0;
3687
3688         data = kzalloc(sizeof(*data), GFP_NOFS);
3689         if (data == NULL)
3690                 return -ENOMEM;
3691         data->args.fhandle = &data->fh;
3692         data->args.stateid = &data->stateid;
3693         data->args.bitmask = server->attr_bitmask;
3694         nfs_copy_fh(&data->fh, NFS_FH(inode));
3695         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3696         data->res.fattr = &data->fattr;
3697         data->res.server = server;
3698         nfs_fattr_init(data->res.fattr);
3699         data->timestamp = jiffies;
3700         data->rpc_status = 0;
3701
3702         task_setup_data.callback_data = data;
3703         msg.rpc_argp = &data->args;
3704         msg.rpc_resp = &data->res;
3705         task = rpc_run_task(&task_setup_data);
3706         if (IS_ERR(task))
3707                 return PTR_ERR(task);
3708         if (!issync)
3709                 goto out;
3710         status = nfs4_wait_for_completion_rpc_task(task);
3711         if (status != 0)
3712                 goto out;
3713         status = data->rpc_status;
3714         if (status != 0)
3715                 goto out;
3716         nfs_refresh_inode(inode, &data->fattr);
3717 out:
3718         rpc_put_task(task);
3719         return status;
3720 }
3721
3722 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3723 {
3724         struct nfs_server *server = NFS_SERVER(inode);
3725         struct nfs4_exception exception = { };
3726         int err;
3727         do {
3728                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3729                 switch (err) {
3730                         case -NFS4ERR_STALE_STATEID:
3731                         case -NFS4ERR_EXPIRED:
3732                         case 0:
3733                                 return 0;
3734                 }
3735                 err = nfs4_handle_exception(server, err, &exception);
3736         } while (exception.retry);
3737         return err;
3738 }
3739
3740 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3741 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3742
3743 /*
3744  * sleep, with exponential backoff, and retry the LOCK operation.
3745  */
3746 static unsigned long
3747 nfs4_set_lock_task_retry(unsigned long timeout)
3748 {
3749         schedule_timeout_killable(timeout);
3750         timeout <<= 1;
3751         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3752                 return NFS4_LOCK_MAXTIMEOUT;
3753         return timeout;
3754 }
3755
3756 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3757 {
3758         struct inode *inode = state->inode;
3759         struct nfs_server *server = NFS_SERVER(inode);
3760         struct nfs_client *clp = server->nfs_client;
3761         struct nfs_lockt_args arg = {
3762                 .fh = NFS_FH(inode),
3763                 .fl = request,
3764         };
3765         struct nfs_lockt_res res = {
3766                 .denied = request,
3767         };
3768         struct rpc_message msg = {
3769                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3770                 .rpc_argp       = &arg,
3771                 .rpc_resp       = &res,
3772                 .rpc_cred       = state->owner->so_cred,
3773         };
3774         struct nfs4_lock_state *lsp;
3775         int status;
3776
3777         arg.lock_owner.clientid = clp->cl_clientid;
3778         status = nfs4_set_lock_state(state, request);
3779         if (status != 0)
3780                 goto out;
3781         lsp = request->fl_u.nfs4_fl.owner;
3782         arg.lock_owner.id = lsp->ls_id.id;
3783         arg.lock_owner.s_dev = server->s_dev;
3784         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3785         switch (status) {
3786                 case 0:
3787                         request->fl_type = F_UNLCK;
3788                         break;
3789                 case -NFS4ERR_DENIED:
3790                         status = 0;
3791         }
3792         request->fl_ops->fl_release_private(request);
3793 out:
3794         return status;
3795 }
3796
3797 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3798 {
3799         struct nfs4_exception exception = { };
3800         int err;
3801
3802         do {
3803                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3804                                 _nfs4_proc_getlk(state, cmd, request),
3805                                 &exception);
3806         } while (exception.retry);
3807         return err;
3808 }
3809
3810 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3811 {
3812         int res = 0;
3813         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3814                 case FL_POSIX:
3815                         res = posix_lock_file_wait(file, fl);
3816                         break;
3817                 case FL_FLOCK:
3818                         res = flock_lock_file_wait(file, fl);
3819                         break;
3820                 default:
3821                         BUG();
3822         }
3823         return res;
3824 }
3825
3826 struct nfs4_unlockdata {
3827         struct nfs_locku_args arg;
3828         struct nfs_locku_res res;
3829         struct nfs4_lock_state *lsp;
3830         struct nfs_open_context *ctx;
3831         struct file_lock fl;
3832         const struct nfs_server *server;
3833         unsigned long timestamp;
3834 };
3835
3836 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3837                 struct nfs_open_context *ctx,
3838                 struct nfs4_lock_state *lsp,
3839                 struct nfs_seqid *seqid)
3840 {
3841         struct nfs4_unlockdata *p;
3842         struct inode *inode = lsp->ls_state->inode;
3843
3844         p = kzalloc(sizeof(*p), GFP_NOFS);
3845         if (p == NULL)
3846                 return NULL;
3847         p->arg.fh = NFS_FH(inode);
3848         p->arg.fl = &p->fl;
3849         p->arg.seqid = seqid;
3850         p->res.seqid = seqid;
3851         p->arg.stateid = &lsp->ls_stateid;
3852         p->lsp = lsp;
3853         atomic_inc(&lsp->ls_count);
3854         /* Ensure we don't close file until we're done freeing locks! */
3855         p->ctx = get_nfs_open_context(ctx);
3856         memcpy(&p->fl, fl, sizeof(p->fl));
3857         p->server = NFS_SERVER(inode);
3858         return p;
3859 }
3860
3861 static void nfs4_locku_release_calldata(void *data)
3862 {
3863         struct nfs4_unlockdata *calldata = data;
3864         nfs_free_seqid(calldata->arg.seqid);
3865         nfs4_put_lock_state(calldata->lsp);
3866         put_nfs_open_context(calldata->ctx);
3867         kfree(calldata);
3868 }
3869
3870 static void nfs4_locku_done(struct rpc_task *task, void *data)
3871 {
3872         struct nfs4_unlockdata *calldata = data;
3873
3874         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3875                 return;
3876         switch (task->tk_status) {
3877                 case 0:
3878                         memcpy(calldata->lsp->ls_stateid.data,
3879                                         calldata->res.stateid.data,
3880                                         sizeof(calldata->lsp->ls_stateid.data));
3881                         renew_lease(calldata->server, calldata->timestamp);
3882                         break;
3883                 case -NFS4ERR_BAD_STATEID:
3884                 case -NFS4ERR_OLD_STATEID:
3885                 case -NFS4ERR_STALE_STATEID:
3886                 case -NFS4ERR_EXPIRED:
3887                         break;
3888                 default:
3889                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3890                                 nfs_restart_rpc(task,
3891                                                  calldata->server->nfs_client);
3892         }
3893 }
3894
3895 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3896 {
3897         struct nfs4_unlockdata *calldata = data;
3898
3899         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3900                 return;
3901         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3902                 /* Note: exit _without_ running nfs4_locku_done */
3903                 task->tk_action = NULL;
3904                 return;
3905         }
3906         calldata->timestamp = jiffies;
3907         if (nfs4_setup_sequence(calldata->server,
3908                                 &calldata->arg.seq_args,
3909                                 &calldata->res.seq_res, 1, task))
3910                 return;
3911         rpc_call_start(task);
3912 }
3913
3914 static const struct rpc_call_ops nfs4_locku_ops = {
3915         .rpc_call_prepare = nfs4_locku_prepare,
3916         .rpc_call_done = nfs4_locku_done,
3917         .rpc_release = nfs4_locku_release_calldata,
3918 };
3919
3920 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3921                 struct nfs_open_context *ctx,
3922                 struct nfs4_lock_state *lsp,
3923                 struct nfs_seqid *seqid)
3924 {
3925         struct nfs4_unlockdata *data;
3926         struct rpc_message msg = {
3927                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3928                 .rpc_cred = ctx->cred,
3929         };
3930         struct rpc_task_setup task_setup_data = {
3931                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3932                 .rpc_message = &msg,
3933                 .callback_ops = &nfs4_locku_ops,
3934                 .workqueue = nfsiod_workqueue,
3935                 .flags = RPC_TASK_ASYNC,
3936         };
3937
3938         /* Ensure this is an unlock - when canceling a lock, the
3939          * canceled lock is passed in, and it won't be an unlock.
3940          */
3941         fl->fl_type = F_UNLCK;
3942
3943         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3944         if (data == NULL) {
3945                 nfs_free_seqid(seqid);
3946                 return ERR_PTR(-ENOMEM);
3947         }
3948
3949         msg.rpc_argp = &data->arg;
3950         msg.rpc_resp = &data->res;
3951         task_setup_data.callback_data = data;
3952         return rpc_run_task(&task_setup_data);
3953 }
3954
3955 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3956 {
3957         struct nfs_inode *nfsi = NFS_I(state->inode);
3958         struct nfs_seqid *seqid;
3959         struct nfs4_lock_state *lsp;
3960         struct rpc_task *task;
3961         int status = 0;
3962         unsigned char fl_flags = request->fl_flags;
3963
3964         status = nfs4_set_lock_state(state, request);
3965         /* Unlock _before_ we do the RPC call */
3966         request->fl_flags |= FL_EXISTS;
3967         down_read(&nfsi->rwsem);
3968         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3969                 up_read(&nfsi->rwsem);
3970                 goto out;
3971         }
3972         up_read(&nfsi->rwsem);
3973         if (status != 0)
3974                 goto out;
3975         /* Is this a delegated lock? */
3976         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3977                 goto out;
3978         lsp = request->fl_u.nfs4_fl.owner;
3979         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
3980         status = -ENOMEM;
3981         if (seqid == NULL)
3982                 goto out;
3983         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3984         status = PTR_ERR(task);
3985         if (IS_ERR(task))
3986                 goto out;
3987         status = nfs4_wait_for_completion_rpc_task(task);
3988         rpc_put_task(task);
3989 out:
3990         request->fl_flags = fl_flags;
3991         return status;
3992 }
3993
3994 struct nfs4_lockdata {
3995         struct nfs_lock_args arg;
3996         struct nfs_lock_res res;
3997         struct nfs4_lock_state *lsp;
3998         struct nfs_open_context *ctx;
3999         struct file_lock fl;
4000         unsigned long timestamp;
4001         int rpc_status;
4002         int cancelled;
4003         struct nfs_server *server;
4004 };
4005
4006 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4007                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4008                 gfp_t gfp_mask)
4009 {
4010         struct nfs4_lockdata *p;
4011         struct inode *inode = lsp->ls_state->inode;
4012         struct nfs_server *server = NFS_SERVER(inode);
4013
4014         p = kzalloc(sizeof(*p), gfp_mask);
4015         if (p == NULL)
4016                 return NULL;
4017
4018         p->arg.fh = NFS_FH(inode);
4019         p->arg.fl = &p->fl;
4020         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4021         if (p->arg.open_seqid == NULL)
4022                 goto out_free;
4023         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4024         if (p->arg.lock_seqid == NULL)
4025                 goto out_free_seqid;
4026         p->arg.lock_stateid = &lsp->ls_stateid;
4027         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4028         p->arg.lock_owner.id = lsp->ls_id.id;
4029         p->arg.lock_owner.s_dev = server->s_dev;
4030         p->res.lock_seqid = p->arg.lock_seqid;
4031         p->lsp = lsp;
4032         p->server = server;
4033         atomic_inc(&lsp->ls_count);
4034         p->ctx = get_nfs_open_context(ctx);
4035         memcpy(&p->fl, fl, sizeof(p->fl));
4036         return p;
4037 out_free_seqid:
4038         nfs_free_seqid(p->arg.open_seqid);
4039 out_free:
4040         kfree(p);
4041         return NULL;
4042 }
4043
4044 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4045 {
4046         struct nfs4_lockdata *data = calldata;
4047         struct nfs4_state *state = data->lsp->ls_state;
4048
4049         dprintk("%s: begin!\n", __func__);
4050         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4051                 return;
4052         /* Do we need to do an open_to_lock_owner? */
4053         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4054                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4055                         return;
4056                 data->arg.open_stateid = &state->stateid;
4057                 data->arg.new_lock_owner = 1;
4058                 data->res.open_seqid = data->arg.open_seqid;
4059         } else
4060                 data->arg.new_lock_owner = 0;
4061         data->timestamp = jiffies;
4062         if (nfs4_setup_sequence(data->server,
4063                                 &data->arg.seq_args,
4064                                 &data->res.seq_res, 1, task))
4065                 return;
4066         rpc_call_start(task);
4067         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4068 }
4069
4070 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4071 {
4072         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4073         nfs4_lock_prepare(task, calldata);
4074 }
4075
4076 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4077 {
4078         struct nfs4_lockdata *data = calldata;
4079
4080         dprintk("%s: begin!\n", __func__);
4081
4082         if (!nfs4_sequence_done(task, &data->res.seq_res))
4083                 return;
4084
4085         data->rpc_status = task->tk_status;
4086         if (data->arg.new_lock_owner != 0) {
4087                 if (data->rpc_status == 0)
4088                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4089                 else
4090                         goto out;
4091         }
4092         if (data->rpc_status == 0) {
4093                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4094                                         sizeof(data->lsp->ls_stateid.data));
4095                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4096                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4097         }
4098 out:
4099         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4100 }
4101
4102 static void nfs4_lock_release(void *calldata)
4103 {
4104         struct nfs4_lockdata *data = calldata;
4105
4106         dprintk("%s: begin!\n", __func__);
4107         nfs_free_seqid(data->arg.open_seqid);
4108         if (data->cancelled != 0) {
4109                 struct rpc_task *task;
4110                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4111                                 data->arg.lock_seqid);
4112                 if (!IS_ERR(task))
4113                         rpc_put_task(task);
4114                 dprintk("%s: cancelling lock!\n", __func__);
4115         } else
4116                 nfs_free_seqid(data->arg.lock_seqid);
4117         nfs4_put_lock_state(data->lsp);
4118         put_nfs_open_context(data->ctx);
4119         kfree(data);
4120         dprintk("%s: done!\n", __func__);
4121 }
4122
4123 static const struct rpc_call_ops nfs4_lock_ops = {
4124         .rpc_call_prepare = nfs4_lock_prepare,
4125         .rpc_call_done = nfs4_lock_done,
4126         .rpc_release = nfs4_lock_release,
4127 };
4128
4129 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4130         .rpc_call_prepare = nfs4_recover_lock_prepare,
4131         .rpc_call_done = nfs4_lock_done,
4132         .rpc_release = nfs4_lock_release,
4133 };
4134
4135 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4136 {
4137         struct nfs_client *clp = server->nfs_client;
4138         struct nfs4_state *state = lsp->ls_state;
4139
4140         switch (error) {
4141         case -NFS4ERR_ADMIN_REVOKED:
4142         case -NFS4ERR_BAD_STATEID:
4143         case -NFS4ERR_EXPIRED:
4144                 if (new_lock_owner != 0 ||
4145                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4146                         nfs4_state_mark_reclaim_nograce(clp, state);
4147                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4148                 break;
4149         case -NFS4ERR_STALE_STATEID:
4150                 if (new_lock_owner != 0 ||
4151                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4152                         nfs4_state_mark_reclaim_reboot(clp, state);
4153                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4154         };
4155 }
4156
4157 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4158 {
4159         struct nfs4_lockdata *data;
4160         struct rpc_task *task;
4161         struct rpc_message msg = {
4162                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4163                 .rpc_cred = state->owner->so_cred,
4164         };
4165         struct rpc_task_setup task_setup_data = {
4166                 .rpc_client = NFS_CLIENT(state->inode),
4167                 .rpc_message = &msg,
4168                 .callback_ops = &nfs4_lock_ops,
4169                 .workqueue = nfsiod_workqueue,
4170                 .flags = RPC_TASK_ASYNC,
4171         };
4172         int ret;
4173
4174         dprintk("%s: begin!\n", __func__);
4175         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4176                         fl->fl_u.nfs4_fl.owner,
4177                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4178         if (data == NULL)
4179                 return -ENOMEM;
4180         if (IS_SETLKW(cmd))
4181                 data->arg.block = 1;
4182         if (recovery_type > NFS_LOCK_NEW) {
4183                 if (recovery_type == NFS_LOCK_RECLAIM)
4184                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4185                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4186         }
4187         msg.rpc_argp = &data->arg;
4188         msg.rpc_resp = &data->res;
4189         task_setup_data.callback_data = data;
4190         task = rpc_run_task(&task_setup_data);
4191         if (IS_ERR(task))
4192                 return PTR_ERR(task);
4193         ret = nfs4_wait_for_completion_rpc_task(task);
4194         if (ret == 0) {
4195                 ret = data->rpc_status;
4196                 if (ret)
4197                         nfs4_handle_setlk_error(data->server, data->lsp,
4198                                         data->arg.new_lock_owner, ret);
4199         } else
4200                 data->cancelled = 1;
4201         rpc_put_task(task);
4202         dprintk("%s: done, ret = %d!\n", __func__, ret);
4203         return ret;
4204 }
4205
4206 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4207 {
4208         struct nfs_server *server = NFS_SERVER(state->inode);
4209         struct nfs4_exception exception = { };
4210         int err;
4211
4212         do {
4213                 /* Cache the lock if possible... */
4214                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4215                         return 0;
4216                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4217                 if (err != -NFS4ERR_DELAY)
4218                         break;
4219                 nfs4_handle_exception(server, err, &exception);
4220         } while (exception.retry);
4221         return err;
4222 }
4223
4224 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4225 {
4226         struct nfs_server *server = NFS_SERVER(state->inode);
4227         struct nfs4_exception exception = { };
4228         int err;
4229
4230         err = nfs4_set_lock_state(state, request);
4231         if (err != 0)
4232                 return err;
4233         do {
4234                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4235                         return 0;
4236                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4237                 switch (err) {
4238                 default:
4239                         goto out;
4240                 case -NFS4ERR_GRACE:
4241                 case -NFS4ERR_DELAY:
4242                         nfs4_handle_exception(server, err, &exception);
4243                         err = 0;
4244                 }
4245         } while (exception.retry);
4246 out:
4247         return err;
4248 }
4249
4250 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4251 {
4252         struct nfs_inode *nfsi = NFS_I(state->inode);
4253         unsigned char fl_flags = request->fl_flags;
4254         int status = -ENOLCK;
4255
4256         if ((fl_flags & FL_POSIX) &&
4257                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4258                 goto out;
4259         /* Is this a delegated open? */
4260         status = nfs4_set_lock_state(state, request);
4261         if (status != 0)
4262                 goto out;
4263         request->fl_flags |= FL_ACCESS;
4264         status = do_vfs_lock(request->fl_file, request);
4265         if (status < 0)
4266                 goto out;
4267         down_read(&nfsi->rwsem);
4268         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4269                 /* Yes: cache locks! */
4270                 /* ...but avoid races with delegation recall... */
4271                 request->fl_flags = fl_flags & ~FL_SLEEP;
4272                 status = do_vfs_lock(request->fl_file, request);
4273                 goto out_unlock;
4274         }
4275         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4276         if (status != 0)
4277                 goto out_unlock;
4278         /* Note: we always want to sleep here! */
4279         request->fl_flags = fl_flags | FL_SLEEP;
4280         if (do_vfs_lock(request->fl_file, request) < 0)
4281                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4282 out_unlock:
4283         up_read(&nfsi->rwsem);
4284 out:
4285         request->fl_flags = fl_flags;
4286         return status;
4287 }
4288
4289 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4290 {
4291         struct nfs4_exception exception = { };
4292         int err;
4293
4294         do {
4295                 err = _nfs4_proc_setlk(state, cmd, request);
4296                 if (err == -NFS4ERR_DENIED)
4297                         err = -EAGAIN;
4298                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4299                                 err, &exception);
4300         } while (exception.retry);
4301         return err;
4302 }
4303
4304 static int
4305 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4306 {
4307         struct nfs_open_context *ctx;
4308         struct nfs4_state *state;
4309         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4310         int status;
4311
4312         /* verify open state */
4313         ctx = nfs_file_open_context(filp);
4314         state = ctx->state;
4315
4316         if (request->fl_start < 0 || request->fl_end < 0)
4317                 return -EINVAL;
4318
4319         if (IS_GETLK(cmd)) {
4320                 if (state != NULL)
4321                         return nfs4_proc_getlk(state, F_GETLK, request);
4322                 return 0;
4323         }
4324
4325         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4326                 return -EINVAL;
4327
4328         if (request->fl_type == F_UNLCK) {
4329                 if (state != NULL)
4330                         return nfs4_proc_unlck(state, cmd, request);
4331                 return 0;
4332         }
4333
4334         if (state == NULL)
4335                 return -ENOLCK;
4336         do {
4337                 status = nfs4_proc_setlk(state, cmd, request);
4338                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4339                         break;
4340                 timeout = nfs4_set_lock_task_retry(timeout);
4341                 status = -ERESTARTSYS;
4342                 if (signalled())
4343                         break;
4344         } while(status < 0);
4345         return status;
4346 }
4347
4348 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4349 {
4350         struct nfs_server *server = NFS_SERVER(state->inode);
4351         struct nfs4_exception exception = { };
4352         int err;
4353
4354         err = nfs4_set_lock_state(state, fl);
4355         if (err != 0)
4356                 goto out;
4357         do {
4358                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4359                 switch (err) {
4360                         default:
4361                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4362                                                 __func__, err);
4363                         case 0:
4364                         case -ESTALE:
4365                                 goto out;
4366                         case -NFS4ERR_EXPIRED:
4367                         case -NFS4ERR_STALE_CLIENTID:
4368                         case -NFS4ERR_STALE_STATEID:
4369                         case -NFS4ERR_BADSESSION:
4370                         case -NFS4ERR_BADSLOT:
4371                         case -NFS4ERR_BAD_HIGH_SLOT:
4372                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4373                         case -NFS4ERR_DEADSESSION:
4374                                 nfs4_schedule_state_recovery(server->nfs_client);
4375                                 goto out;
4376                         case -ERESTARTSYS:
4377                                 /*
4378                                  * The show must go on: exit, but mark the
4379                                  * stateid as needing recovery.
4380                                  */
4381                         case -NFS4ERR_ADMIN_REVOKED:
4382                         case -NFS4ERR_BAD_STATEID:
4383                         case -NFS4ERR_OPENMODE:
4384                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4385                                 err = 0;
4386                                 goto out;
4387                         case -EKEYEXPIRED:
4388                                 /*
4389                                  * User RPCSEC_GSS context has expired.
4390                                  * We cannot recover this stateid now, so
4391                                  * skip it and allow recovery thread to
4392                                  * proceed.
4393                                  */
4394                                 err = 0;
4395                                 goto out;
4396                         case -ENOMEM:
4397                         case -NFS4ERR_DENIED:
4398                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4399                                 err = 0;
4400                                 goto out;
4401                         case -NFS4ERR_DELAY:
4402                                 break;
4403                 }
4404                 err = nfs4_handle_exception(server, err, &exception);
4405         } while (exception.retry);
4406 out:
4407         return err;
4408 }
4409
4410 static void nfs4_release_lockowner_release(void *calldata)
4411 {
4412         kfree(calldata);
4413 }
4414
4415 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4416         .rpc_release = nfs4_release_lockowner_release,
4417 };
4418
4419 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4420 {
4421         struct nfs_server *server = lsp->ls_state->owner->so_server;
4422         struct nfs_release_lockowner_args *args;
4423         struct rpc_message msg = {
4424                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4425         };
4426
4427         if (server->nfs_client->cl_mvops->minor_version != 0)
4428                 return;
4429         args = kmalloc(sizeof(*args), GFP_NOFS);
4430         if (!args)
4431                 return;
4432         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4433         args->lock_owner.id = lsp->ls_id.id;
4434         args->lock_owner.s_dev = server->s_dev;
4435         msg.rpc_argp = args;
4436         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4437 }
4438
4439 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4440
4441 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4442                                    const void *buf, size_t buflen,
4443                                    int flags, int type)
4444 {
4445         if (strcmp(key, "") != 0)
4446                 return -EINVAL;
4447
4448         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4449 }
4450
4451 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4452                                    void *buf, size_t buflen, int type)
4453 {
4454         if (strcmp(key, "") != 0)
4455                 return -EINVAL;
4456
4457         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4458 }
4459
4460 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4461                                        size_t list_len, const char *name,
4462                                        size_t name_len, int type)
4463 {
4464         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4465
4466         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4467                 return 0;
4468
4469         if (list && len <= list_len)
4470                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4471         return len;
4472 }
4473
4474 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4475 {
4476         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4477                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4478                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4479                 return;
4480
4481         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4482                 NFS_ATTR_FATTR_NLINK;
4483         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4484         fattr->nlink = 2;
4485 }
4486
4487 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4488                 struct nfs4_fs_locations *fs_locations, struct page *page)
4489 {
4490         struct nfs_server *server = NFS_SERVER(dir);
4491         u32 bitmask[2] = {
4492                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4493                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4494         };
4495         struct nfs4_fs_locations_arg args = {
4496                 .dir_fh = NFS_FH(dir),
4497                 .name = name,
4498                 .page = page,
4499                 .bitmask = bitmask,
4500         };
4501         struct nfs4_fs_locations_res res = {
4502                 .fs_locations = fs_locations,
4503         };
4504         struct rpc_message msg = {
4505                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4506                 .rpc_argp = &args,
4507                 .rpc_resp = &res,
4508         };
4509         int status;
4510
4511         dprintk("%s: start\n", __func__);
4512         nfs_fattr_init(&fs_locations->fattr);
4513         fs_locations->server = server;
4514         fs_locations->nlocations = 0;
4515         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4516         nfs_fixup_referral_attributes(&fs_locations->fattr);
4517         dprintk("%s: returned status = %d\n", __func__, status);
4518         return status;
4519 }
4520
4521 #ifdef CONFIG_NFS_V4_1
4522 /*
4523  * Check the exchange flags returned by the server for invalid flags, having
4524  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4525  * DS flags set.
4526  */
4527 static int nfs4_check_cl_exchange_flags(u32 flags)
4528 {
4529         if (flags & ~EXCHGID4_FLAG_MASK_R)
4530                 goto out_inval;
4531         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4532             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4533                 goto out_inval;
4534         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4535                 goto out_inval;
4536         return NFS_OK;
4537 out_inval:
4538         return -NFS4ERR_INVAL;
4539 }
4540
4541 /*
4542  * nfs4_proc_exchange_id()
4543  *
4544  * Since the clientid has expired, all compounds using sessions
4545  * associated with the stale clientid will be returning
4546  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4547  * be in some phase of session reset.
4548  */
4549 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4550 {
4551         nfs4_verifier verifier;
4552         struct nfs41_exchange_id_args args = {
4553                 .client = clp,
4554                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4555         };
4556         struct nfs41_exchange_id_res res = {
4557                 .client = clp,
4558         };
4559         int status;
4560         struct rpc_message msg = {
4561                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4562                 .rpc_argp = &args,
4563                 .rpc_resp = &res,
4564                 .rpc_cred = cred,
4565         };
4566         __be32 *p;
4567
4568         dprintk("--> %s\n", __func__);
4569         BUG_ON(clp == NULL);
4570
4571         p = (u32 *)verifier.data;
4572         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4573         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4574         args.verifier = &verifier;
4575
4576         args.id_len = scnprintf(args.id, sizeof(args.id),
4577                                 "%s/%s.%s/%u",
4578                                 clp->cl_ipaddr,
4579                                 init_utsname()->nodename,
4580                                 init_utsname()->domainname,
4581                                 clp->cl_rpcclient->cl_auth->au_flavor);
4582
4583         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4584         if (!status)
4585                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4586         dprintk("<-- %s status= %d\n", __func__, status);
4587         return status;
4588 }
4589
4590 struct nfs4_get_lease_time_data {
4591         struct nfs4_get_lease_time_args *args;
4592         struct nfs4_get_lease_time_res *res;
4593         struct nfs_client *clp;
4594 };
4595
4596 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4597                                         void *calldata)
4598 {
4599         int ret;
4600         struct nfs4_get_lease_time_data *data =
4601                         (struct nfs4_get_lease_time_data *)calldata;
4602
4603         dprintk("--> %s\n", __func__);
4604         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4605         /* just setup sequence, do not trigger session recovery
4606            since we're invoked within one */
4607         ret = nfs41_setup_sequence(data->clp->cl_session,
4608                                    &data->args->la_seq_args,
4609                                    &data->res->lr_seq_res, 0, task);
4610
4611         BUG_ON(ret == -EAGAIN);
4612         rpc_call_start(task);
4613         dprintk("<-- %s\n", __func__);
4614 }
4615
4616 /*
4617  * Called from nfs4_state_manager thread for session setup, so don't recover
4618  * from sequence operation or clientid errors.
4619  */
4620 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4621 {
4622         struct nfs4_get_lease_time_data *data =
4623                         (struct nfs4_get_lease_time_data *)calldata;
4624
4625         dprintk("--> %s\n", __func__);
4626         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4627                 return;
4628         switch (task->tk_status) {
4629         case -NFS4ERR_DELAY:
4630         case -NFS4ERR_GRACE:
4631                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4632                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4633                 task->tk_status = 0;
4634                 nfs_restart_rpc(task, data->clp);
4635                 return;
4636         }
4637         dprintk("<-- %s\n", __func__);
4638 }
4639
4640 struct rpc_call_ops nfs4_get_lease_time_ops = {
4641         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4642         .rpc_call_done = nfs4_get_lease_time_done,
4643 };
4644
4645 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4646 {
4647         struct rpc_task *task;
4648         struct nfs4_get_lease_time_args args;
4649         struct nfs4_get_lease_time_res res = {
4650                 .lr_fsinfo = fsinfo,
4651         };
4652         struct nfs4_get_lease_time_data data = {
4653                 .args = &args,
4654                 .res = &res,
4655                 .clp = clp,
4656         };
4657         struct rpc_message msg = {
4658                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4659                 .rpc_argp = &args,
4660                 .rpc_resp = &res,
4661         };
4662         struct rpc_task_setup task_setup = {
4663                 .rpc_client = clp->cl_rpcclient,
4664                 .rpc_message = &msg,
4665                 .callback_ops = &nfs4_get_lease_time_ops,
4666                 .callback_data = &data
4667         };
4668         int status;
4669
4670         dprintk("--> %s\n", __func__);
4671         task = rpc_run_task(&task_setup);
4672
4673         if (IS_ERR(task))
4674                 status = PTR_ERR(task);
4675         else {
4676                 status = task->tk_status;
4677                 rpc_put_task(task);
4678         }
4679         dprintk("<-- %s return %d\n", __func__, status);
4680
4681         return status;
4682 }
4683
4684 /*
4685  * Reset a slot table
4686  */
4687 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4688                                  int ivalue)
4689 {
4690         struct nfs4_slot *new = NULL;
4691         int i;
4692         int ret = 0;
4693
4694         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4695                 max_reqs, tbl->max_slots);
4696
4697         /* Does the newly negotiated max_reqs match the existing slot table? */
4698         if (max_reqs != tbl->max_slots) {
4699                 ret = -ENOMEM;
4700                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4701                               GFP_NOFS);
4702                 if (!new)
4703                         goto out;
4704                 ret = 0;
4705                 kfree(tbl->slots);
4706         }
4707         spin_lock(&tbl->slot_tbl_lock);
4708         if (new) {
4709                 tbl->slots = new;
4710                 tbl->max_slots = max_reqs;
4711         }
4712         for (i = 0; i < tbl->max_slots; ++i)
4713                 tbl->slots[i].seq_nr = ivalue;
4714         spin_unlock(&tbl->slot_tbl_lock);
4715         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4716                 tbl, tbl->slots, tbl->max_slots);
4717 out:
4718         dprintk("<-- %s: return %d\n", __func__, ret);
4719         return ret;
4720 }
4721
4722 /*
4723  * Reset the forechannel and backchannel slot tables
4724  */
4725 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4726 {
4727         int status;
4728
4729         status = nfs4_reset_slot_table(&session->fc_slot_table,
4730                         session->fc_attrs.max_reqs, 1);
4731         if (status)
4732                 return status;
4733
4734         status = nfs4_reset_slot_table(&session->bc_slot_table,
4735                         session->bc_attrs.max_reqs, 0);
4736         return status;
4737 }
4738
4739 /* Destroy the slot table */
4740 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4741 {
4742         if (session->fc_slot_table.slots != NULL) {
4743                 kfree(session->fc_slot_table.slots);
4744                 session->fc_slot_table.slots = NULL;
4745         }
4746         if (session->bc_slot_table.slots != NULL) {
4747                 kfree(session->bc_slot_table.slots);
4748                 session->bc_slot_table.slots = NULL;
4749         }
4750         return;
4751 }
4752
4753 /*
4754  * Initialize slot table
4755  */
4756 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4757                 int max_slots, int ivalue)
4758 {
4759         struct nfs4_slot *slot;
4760         int ret = -ENOMEM;
4761
4762         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4763
4764         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4765
4766         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4767         if (!slot)
4768                 goto out;
4769         ret = 0;
4770
4771         spin_lock(&tbl->slot_tbl_lock);
4772         tbl->max_slots = max_slots;
4773         tbl->slots = slot;
4774         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4775         spin_unlock(&tbl->slot_tbl_lock);
4776         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4777                 tbl, tbl->slots, tbl->max_slots);
4778 out:
4779         dprintk("<-- %s: return %d\n", __func__, ret);
4780         return ret;
4781 }
4782
4783 /*
4784  * Initialize the forechannel and backchannel tables
4785  */
4786 static int nfs4_init_slot_tables(struct nfs4_session *session)
4787 {
4788         struct nfs4_slot_table *tbl;
4789         int status = 0;
4790
4791         tbl = &session->fc_slot_table;
4792         if (tbl->slots == NULL) {
4793                 status = nfs4_init_slot_table(tbl,
4794                                 session->fc_attrs.max_reqs, 1);
4795                 if (status)
4796                         return status;
4797         }
4798
4799         tbl = &session->bc_slot_table;
4800         if (tbl->slots == NULL) {
4801                 status = nfs4_init_slot_table(tbl,
4802                                 session->bc_attrs.max_reqs, 0);
4803                 if (status)
4804                         nfs4_destroy_slot_tables(session);
4805         }
4806
4807         return status;
4808 }
4809
4810 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4811 {
4812         struct nfs4_session *session;
4813         struct nfs4_slot_table *tbl;
4814
4815         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4816         if (!session)
4817                 return NULL;
4818
4819         tbl = &session->fc_slot_table;
4820         tbl->highest_used_slotid = -1;
4821         spin_lock_init(&tbl->slot_tbl_lock);
4822         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4823         init_completion(&tbl->complete);
4824
4825         tbl = &session->bc_slot_table;
4826         tbl->highest_used_slotid = -1;
4827         spin_lock_init(&tbl->slot_tbl_lock);
4828         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4829         init_completion(&tbl->complete);
4830
4831         session->session_state = 1<<NFS4_SESSION_INITING;
4832
4833         session->clp = clp;
4834         return session;
4835 }
4836
4837 void nfs4_destroy_session(struct nfs4_session *session)
4838 {
4839         nfs4_proc_destroy_session(session);
4840         dprintk("%s Destroy backchannel for xprt %p\n",
4841                 __func__, session->clp->cl_rpcclient->cl_xprt);
4842         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4843                                 NFS41_BC_MIN_CALLBACKS);
4844         nfs4_destroy_slot_tables(session);
4845         kfree(session);
4846 }
4847
4848 /*
4849  * Initialize the values to be used by the client in CREATE_SESSION
4850  * If nfs4_init_session set the fore channel request and response sizes,
4851  * use them.
4852  *
4853  * Set the back channel max_resp_sz_cached to zero to force the client to
4854  * always set csa_cachethis to FALSE because the current implementation
4855  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4856  */
4857 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4858 {
4859         struct nfs4_session *session = args->client->cl_session;
4860         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4861                      mxresp_sz = session->fc_attrs.max_resp_sz;
4862
4863         if (mxrqst_sz == 0)
4864                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4865         if (mxresp_sz == 0)
4866                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4867         /* Fore channel attributes */
4868         args->fc_attrs.headerpadsz = 0;
4869         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4870         args->fc_attrs.max_resp_sz = mxresp_sz;
4871         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4872         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4873
4874         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4875                 "max_ops=%u max_reqs=%u\n",
4876                 __func__,
4877                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4878                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4879
4880         /* Back channel attributes */
4881         args->bc_attrs.headerpadsz = 0;
4882         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4883         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4884         args->bc_attrs.max_resp_sz_cached = 0;
4885         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4886         args->bc_attrs.max_reqs = 1;
4887
4888         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4889                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4890                 __func__,
4891                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4892                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4893                 args->bc_attrs.max_reqs);
4894 }
4895
4896 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4897 {
4898         struct nfs4_channel_attrs *sent = &args->fc_attrs;
4899         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
4900
4901         if (rcvd->headerpadsz > sent->headerpadsz)
4902                 return -EINVAL;
4903         if (rcvd->max_resp_sz > sent->max_resp_sz)
4904                 return -EINVAL;
4905         /*
4906          * Our requested max_ops is the minimum we need; we're not
4907          * prepared to break up compounds into smaller pieces than that.
4908          * So, no point even trying to continue if the server won't
4909          * cooperate:
4910          */
4911         if (rcvd->max_ops < sent->max_ops)
4912                 return -EINVAL;
4913         if (rcvd->max_reqs == 0)
4914                 return -EINVAL;
4915         return 0;
4916 }
4917
4918 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4919 {
4920         struct nfs4_channel_attrs *sent = &args->bc_attrs;
4921         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
4922
4923         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
4924                 return -EINVAL;
4925         if (rcvd->max_resp_sz < sent->max_resp_sz)
4926                 return -EINVAL;
4927         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
4928                 return -EINVAL;
4929         /* These would render the backchannel useless: */
4930         if (rcvd->max_ops  == 0)
4931                 return -EINVAL;
4932         if (rcvd->max_reqs == 0)
4933                 return -EINVAL;
4934         return 0;
4935 }
4936
4937 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4938                                      struct nfs4_session *session)
4939 {
4940         int ret;
4941
4942         ret = nfs4_verify_fore_channel_attrs(args, session);
4943         if (ret)
4944                 return ret;
4945         return nfs4_verify_back_channel_attrs(args, session);
4946 }
4947
4948 static int _nfs4_proc_create_session(struct nfs_client *clp)
4949 {
4950         struct nfs4_session *session = clp->cl_session;
4951         struct nfs41_create_session_args args = {
4952                 .client = clp,
4953                 .cb_program = NFS4_CALLBACK,
4954         };
4955         struct nfs41_create_session_res res = {
4956                 .client = clp,
4957         };
4958         struct rpc_message msg = {
4959                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4960                 .rpc_argp = &args,
4961                 .rpc_resp = &res,
4962         };
4963         int status;
4964
4965         nfs4_init_channel_attrs(&args);
4966         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4967
4968         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4969
4970         if (!status)
4971                 /* Verify the session's negotiated channel_attrs values */
4972                 status = nfs4_verify_channel_attrs(&args, session);
4973         if (!status) {
4974                 /* Increment the clientid slot sequence id */
4975                 clp->cl_seqid++;
4976         }
4977
4978         return status;
4979 }
4980
4981 /*
4982  * Issues a CREATE_SESSION operation to the server.
4983  * It is the responsibility of the caller to verify the session is
4984  * expired before calling this routine.
4985  */
4986 int nfs4_proc_create_session(struct nfs_client *clp)
4987 {
4988         int status;
4989         unsigned *ptr;
4990         struct nfs4_session *session = clp->cl_session;
4991
4992         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4993
4994         status = _nfs4_proc_create_session(clp);
4995         if (status)
4996                 goto out;
4997
4998         /* Init and reset the fore channel */
4999         status = nfs4_init_slot_tables(session);
5000         dprintk("slot table initialization returned %d\n", status);
5001         if (status)
5002                 goto out;
5003         status = nfs4_reset_slot_tables(session);
5004         dprintk("slot table reset returned %d\n", status);
5005         if (status)
5006                 goto out;
5007
5008         ptr = (unsigned *)&session->sess_id.data[0];
5009         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5010                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5011 out:
5012         dprintk("<-- %s\n", __func__);
5013         return status;
5014 }
5015
5016 /*
5017  * Issue the over-the-wire RPC DESTROY_SESSION.
5018  * The caller must serialize access to this routine.
5019  */
5020 int nfs4_proc_destroy_session(struct nfs4_session *session)
5021 {
5022         int status = 0;
5023         struct rpc_message msg;
5024
5025         dprintk("--> nfs4_proc_destroy_session\n");
5026
5027         /* session is still being setup */
5028         if (session->clp->cl_cons_state != NFS_CS_READY)
5029                 return status;
5030
5031         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5032         msg.rpc_argp = session;
5033         msg.rpc_resp = NULL;
5034         msg.rpc_cred = NULL;
5035         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5036
5037         if (status)
5038                 printk(KERN_WARNING
5039                         "Got error %d from the server on DESTROY_SESSION. "
5040                         "Session has been destroyed regardless...\n", status);
5041
5042         dprintk("<-- nfs4_proc_destroy_session\n");
5043         return status;
5044 }
5045
5046 int nfs4_init_session(struct nfs_server *server)
5047 {
5048         struct nfs_client *clp = server->nfs_client;
5049         struct nfs4_session *session;
5050         unsigned int rsize, wsize;
5051         int ret;
5052
5053         if (!nfs4_has_session(clp))
5054                 return 0;
5055
5056         session = clp->cl_session;
5057         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5058                 return 0;
5059
5060         rsize = server->rsize;
5061         if (rsize == 0)
5062                 rsize = NFS_MAX_FILE_IO_SIZE;
5063         wsize = server->wsize;
5064         if (wsize == 0)
5065                 wsize = NFS_MAX_FILE_IO_SIZE;
5066
5067         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5068         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5069
5070         ret = nfs4_recover_expired_lease(server);
5071         if (!ret)
5072                 ret = nfs4_check_client_ready(clp);
5073         return ret;
5074 }
5075
5076 /*
5077  * Renew the cl_session lease.
5078  */
5079 struct nfs4_sequence_data {
5080         struct nfs_client *clp;
5081         struct nfs4_sequence_args args;
5082         struct nfs4_sequence_res res;
5083 };
5084
5085 static void nfs41_sequence_release(void *data)
5086 {
5087         struct nfs4_sequence_data *calldata = data;
5088         struct nfs_client *clp = calldata->clp;
5089
5090         if (atomic_read(&clp->cl_count) > 1)
5091                 nfs4_schedule_state_renewal(clp);
5092         nfs_put_client(clp);
5093         kfree(calldata);
5094 }
5095
5096 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5097 {
5098         switch(task->tk_status) {
5099         case -NFS4ERR_DELAY:
5100                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5101                 return -EAGAIN;
5102         default:
5103                 nfs4_schedule_state_recovery(clp);
5104         }
5105         return 0;
5106 }
5107
5108 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5109 {
5110         struct nfs4_sequence_data *calldata = data;
5111         struct nfs_client *clp = calldata->clp;
5112
5113         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5114                 return;
5115
5116         if (task->tk_status < 0) {
5117                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5118                 if (atomic_read(&clp->cl_count) == 1)
5119                         goto out;
5120
5121                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5122                         rpc_restart_call_prepare(task);
5123                         return;
5124                 }
5125         }
5126         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5127 out:
5128         dprintk("<-- %s\n", __func__);
5129 }
5130
5131 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5132 {
5133         struct nfs4_sequence_data *calldata = data;
5134         struct nfs_client *clp = calldata->clp;
5135         struct nfs4_sequence_args *args;
5136         struct nfs4_sequence_res *res;
5137
5138         args = task->tk_msg.rpc_argp;
5139         res = task->tk_msg.rpc_resp;
5140
5141         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5142                 return;
5143         rpc_call_start(task);
5144 }
5145
5146 static const struct rpc_call_ops nfs41_sequence_ops = {
5147         .rpc_call_done = nfs41_sequence_call_done,
5148         .rpc_call_prepare = nfs41_sequence_prepare,
5149         .rpc_release = nfs41_sequence_release,
5150 };
5151
5152 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5153 {
5154         struct nfs4_sequence_data *calldata;
5155         struct rpc_message msg = {
5156                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5157                 .rpc_cred = cred,
5158         };
5159         struct rpc_task_setup task_setup_data = {
5160                 .rpc_client = clp->cl_rpcclient,
5161                 .rpc_message = &msg,
5162                 .callback_ops = &nfs41_sequence_ops,
5163                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5164         };
5165
5166         if (!atomic_inc_not_zero(&clp->cl_count))
5167                 return ERR_PTR(-EIO);
5168         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5169         if (calldata == NULL) {
5170                 nfs_put_client(clp);
5171                 return ERR_PTR(-ENOMEM);
5172         }
5173         msg.rpc_argp = &calldata->args;
5174         msg.rpc_resp = &calldata->res;
5175         calldata->clp = clp;
5176         task_setup_data.callback_data = calldata;
5177
5178         return rpc_run_task(&task_setup_data);
5179 }
5180
5181 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5182 {
5183         struct rpc_task *task;
5184         int ret = 0;
5185
5186         task = _nfs41_proc_sequence(clp, cred);
5187         if (IS_ERR(task))
5188                 ret = PTR_ERR(task);
5189         else
5190                 rpc_put_task(task);
5191         dprintk("<-- %s status=%d\n", __func__, ret);
5192         return ret;
5193 }
5194
5195 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5196 {
5197         struct rpc_task *task;
5198         int ret;
5199
5200         task = _nfs41_proc_sequence(clp, cred);
5201         if (IS_ERR(task)) {
5202                 ret = PTR_ERR(task);
5203                 goto out;
5204         }
5205         ret = rpc_wait_for_completion_task(task);
5206         if (!ret)
5207                 ret = task->tk_status;
5208         rpc_put_task(task);
5209 out:
5210         dprintk("<-- %s status=%d\n", __func__, ret);
5211         return ret;
5212 }
5213
5214 struct nfs4_reclaim_complete_data {
5215         struct nfs_client *clp;
5216         struct nfs41_reclaim_complete_args arg;
5217         struct nfs41_reclaim_complete_res res;
5218 };
5219
5220 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5221 {
5222         struct nfs4_reclaim_complete_data *calldata = data;
5223
5224         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5225         if (nfs41_setup_sequence(calldata->clp->cl_session,
5226                                 &calldata->arg.seq_args,
5227                                 &calldata->res.seq_res, 0, task))
5228                 return;
5229
5230         rpc_call_start(task);
5231 }
5232
5233 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5234 {
5235         switch(task->tk_status) {
5236         case 0:
5237         case -NFS4ERR_COMPLETE_ALREADY:
5238         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5239                 break;
5240         case -NFS4ERR_DELAY:
5241                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5242                 return -EAGAIN;
5243         default:
5244                 nfs4_schedule_state_recovery(clp);
5245         }
5246         return 0;
5247 }
5248
5249 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5250 {
5251         struct nfs4_reclaim_complete_data *calldata = data;
5252         struct nfs_client *clp = calldata->clp;
5253         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5254
5255         dprintk("--> %s\n", __func__);
5256         if (!nfs41_sequence_done(task, res))
5257                 return;
5258
5259         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5260                 rpc_restart_call_prepare(task);
5261                 return;
5262         }
5263         dprintk("<-- %s\n", __func__);
5264 }
5265
5266 static void nfs4_free_reclaim_complete_data(void *data)
5267 {
5268         struct nfs4_reclaim_complete_data *calldata = data;
5269
5270         kfree(calldata);
5271 }
5272
5273 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5274         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5275         .rpc_call_done = nfs4_reclaim_complete_done,
5276         .rpc_release = nfs4_free_reclaim_complete_data,
5277 };
5278
5279 /*
5280  * Issue a global reclaim complete.
5281  */
5282 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5283 {
5284         struct nfs4_reclaim_complete_data *calldata;
5285         struct rpc_task *task;
5286         struct rpc_message msg = {
5287                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5288         };
5289         struct rpc_task_setup task_setup_data = {
5290                 .rpc_client = clp->cl_rpcclient,
5291                 .rpc_message = &msg,
5292                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5293                 .flags = RPC_TASK_ASYNC,
5294         };
5295         int status = -ENOMEM;
5296
5297         dprintk("--> %s\n", __func__);
5298         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5299         if (calldata == NULL)
5300                 goto out;
5301         calldata->clp = clp;
5302         calldata->arg.one_fs = 0;
5303
5304         msg.rpc_argp = &calldata->arg;
5305         msg.rpc_resp = &calldata->res;
5306         task_setup_data.callback_data = calldata;
5307         task = rpc_run_task(&task_setup_data);
5308         if (IS_ERR(task)) {
5309                 status = PTR_ERR(task);
5310                 goto out;
5311         }
5312         rpc_put_task(task);
5313         return 0;
5314 out:
5315         dprintk("<-- %s status=%d\n", __func__, status);
5316         return status;
5317 }
5318
5319 static void
5320 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5321 {
5322         struct nfs4_layoutget *lgp = calldata;
5323         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5324
5325         dprintk("--> %s\n", __func__);
5326         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5327          * right now covering the LAYOUTGET we are about to send.
5328          * However, that is not so catastrophic, and there seems
5329          * to be no way to prevent it completely.
5330          */
5331         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5332                                 &lgp->res.seq_res, 0, task))
5333                 return;
5334         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5335                                           NFS_I(lgp->args.inode)->layout,
5336                                           lgp->args.ctx->state)) {
5337                 rpc_exit(task, NFS4_OK);
5338                 return;
5339         }
5340         rpc_call_start(task);
5341 }
5342
5343 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5344 {
5345         struct nfs4_layoutget *lgp = calldata;
5346         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5347
5348         dprintk("--> %s\n", __func__);
5349
5350         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5351                 return;
5352
5353         switch (task->tk_status) {
5354         case 0:
5355                 break;
5356         case -NFS4ERR_LAYOUTTRYLATER:
5357         case -NFS4ERR_RECALLCONFLICT:
5358                 task->tk_status = -NFS4ERR_DELAY;
5359                 /* Fall through */
5360         default:
5361                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5362                         rpc_restart_call_prepare(task);
5363                         return;
5364                 }
5365         }
5366         dprintk("<-- %s\n", __func__);
5367 }
5368
5369 static void nfs4_layoutget_release(void *calldata)
5370 {
5371         struct nfs4_layoutget *lgp = calldata;
5372
5373         dprintk("--> %s\n", __func__);
5374         if (lgp->res.layout.buf != NULL)
5375                 free_page((unsigned long) lgp->res.layout.buf);
5376         put_nfs_open_context(lgp->args.ctx);
5377         kfree(calldata);
5378         dprintk("<-- %s\n", __func__);
5379 }
5380
5381 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5382         .rpc_call_prepare = nfs4_layoutget_prepare,
5383         .rpc_call_done = nfs4_layoutget_done,
5384         .rpc_release = nfs4_layoutget_release,
5385 };
5386
5387 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5388 {
5389         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5390         struct rpc_task *task;
5391         struct rpc_message msg = {
5392                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5393                 .rpc_argp = &lgp->args,
5394                 .rpc_resp = &lgp->res,
5395         };
5396         struct rpc_task_setup task_setup_data = {
5397                 .rpc_client = server->client,
5398                 .rpc_message = &msg,
5399                 .callback_ops = &nfs4_layoutget_call_ops,
5400                 .callback_data = lgp,
5401                 .flags = RPC_TASK_ASYNC,
5402         };
5403         int status = 0;
5404
5405         dprintk("--> %s\n", __func__);
5406
5407         lgp->res.layout.buf = (void *)__get_free_page(GFP_NOFS);
5408         if (lgp->res.layout.buf == NULL) {
5409                 nfs4_layoutget_release(lgp);
5410                 return -ENOMEM;
5411         }
5412
5413         lgp->res.seq_res.sr_slot = NULL;
5414         task = rpc_run_task(&task_setup_data);
5415         if (IS_ERR(task))
5416                 return PTR_ERR(task);
5417         status = nfs4_wait_for_completion_rpc_task(task);
5418         if (status == 0)
5419                 status = task->tk_status;
5420         if (status == 0)
5421                 status = pnfs_layout_process(lgp);
5422         rpc_put_task(task);
5423         dprintk("<-- %s status=%d\n", __func__, status);
5424         return status;
5425 }
5426
5427 static int
5428 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5429 {
5430         struct nfs4_getdeviceinfo_args args = {
5431                 .pdev = pdev,
5432         };
5433         struct nfs4_getdeviceinfo_res res = {
5434                 .pdev = pdev,
5435         };
5436         struct rpc_message msg = {
5437                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5438                 .rpc_argp = &args,
5439                 .rpc_resp = &res,
5440         };
5441         int status;
5442
5443         dprintk("--> %s\n", __func__);
5444         status = nfs4_call_sync(server, &msg, &args, &res, 0);
5445         dprintk("<-- %s status=%d\n", __func__, status);
5446
5447         return status;
5448 }
5449
5450 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5451 {
5452         struct nfs4_exception exception = { };
5453         int err;
5454
5455         do {
5456                 err = nfs4_handle_exception(server,
5457                                         _nfs4_proc_getdeviceinfo(server, pdev),
5458                                         &exception);
5459         } while (exception.retry);
5460         return err;
5461 }
5462 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5463
5464 #endif /* CONFIG_NFS_V4_1 */
5465
5466 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5467         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5468         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5469         .recover_open   = nfs4_open_reclaim,
5470         .recover_lock   = nfs4_lock_reclaim,
5471         .establish_clid = nfs4_init_clientid,
5472         .get_clid_cred  = nfs4_get_setclientid_cred,
5473 };
5474
5475 #if defined(CONFIG_NFS_V4_1)
5476 struct nfs4_state_recovery_ops nfs41_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 = nfs41_init_clientid,
5482         .get_clid_cred  = nfs4_get_exchange_id_cred,
5483         .reclaim_complete = nfs41_proc_reclaim_complete,
5484 };
5485 #endif /* CONFIG_NFS_V4_1 */
5486
5487 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5488         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5489         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5490         .recover_open   = nfs4_open_expired,
5491         .recover_lock   = nfs4_lock_expired,
5492         .establish_clid = nfs4_init_clientid,
5493         .get_clid_cred  = nfs4_get_setclientid_cred,
5494 };
5495
5496 #if defined(CONFIG_NFS_V4_1)
5497 struct nfs4_state_recovery_ops nfs41_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 = nfs41_init_clientid,
5503         .get_clid_cred  = nfs4_get_exchange_id_cred,
5504 };
5505 #endif /* CONFIG_NFS_V4_1 */
5506
5507 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5508         .sched_state_renewal = nfs4_proc_async_renew,
5509         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5510         .renew_lease = nfs4_proc_renew,
5511 };
5512
5513 #if defined(CONFIG_NFS_V4_1)
5514 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5515         .sched_state_renewal = nfs41_proc_async_sequence,
5516         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5517         .renew_lease = nfs4_proc_sequence,
5518 };
5519 #endif
5520
5521 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5522         .minor_version = 0,
5523         .call_sync = _nfs4_call_sync,
5524         .validate_stateid = nfs4_validate_delegation_stateid,
5525         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5526         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5527         .state_renewal_ops = &nfs40_state_renewal_ops,
5528 };
5529
5530 #if defined(CONFIG_NFS_V4_1)
5531 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5532         .minor_version = 1,
5533         .call_sync = _nfs4_call_sync_session,
5534         .validate_stateid = nfs41_validate_delegation_stateid,
5535         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5536         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5537         .state_renewal_ops = &nfs41_state_renewal_ops,
5538 };
5539 #endif
5540
5541 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5542         [0] = &nfs_v4_0_minor_ops,
5543 #if defined(CONFIG_NFS_V4_1)
5544         [1] = &nfs_v4_1_minor_ops,
5545 #endif
5546 };
5547
5548 static const struct inode_operations nfs4_file_inode_operations = {
5549         .permission     = nfs_permission,
5550         .getattr        = nfs_getattr,
5551         .setattr        = nfs_setattr,
5552         .getxattr       = generic_getxattr,
5553         .setxattr       = generic_setxattr,
5554         .listxattr      = generic_listxattr,
5555         .removexattr    = generic_removexattr,
5556 };
5557
5558 const struct nfs_rpc_ops nfs_v4_clientops = {
5559         .version        = 4,                    /* protocol version */
5560         .dentry_ops     = &nfs4_dentry_operations,
5561         .dir_inode_ops  = &nfs4_dir_inode_operations,
5562         .file_inode_ops = &nfs4_file_inode_operations,
5563         .getroot        = nfs4_proc_get_root,
5564         .getattr        = nfs4_proc_getattr,
5565         .setattr        = nfs4_proc_setattr,
5566         .lookupfh       = nfs4_proc_lookupfh,
5567         .lookup         = nfs4_proc_lookup,
5568         .access         = nfs4_proc_access,
5569         .readlink       = nfs4_proc_readlink,
5570         .create         = nfs4_proc_create,
5571         .remove         = nfs4_proc_remove,
5572         .unlink_setup   = nfs4_proc_unlink_setup,
5573         .unlink_done    = nfs4_proc_unlink_done,
5574         .rename         = nfs4_proc_rename,
5575         .rename_setup   = nfs4_proc_rename_setup,
5576         .rename_done    = nfs4_proc_rename_done,
5577         .link           = nfs4_proc_link,
5578         .symlink        = nfs4_proc_symlink,
5579         .mkdir          = nfs4_proc_mkdir,
5580         .rmdir          = nfs4_proc_remove,
5581         .readdir        = nfs4_proc_readdir,
5582         .mknod          = nfs4_proc_mknod,
5583         .statfs         = nfs4_proc_statfs,
5584         .fsinfo         = nfs4_proc_fsinfo,
5585         .pathconf       = nfs4_proc_pathconf,
5586         .set_capabilities = nfs4_server_capabilities,
5587         .decode_dirent  = nfs4_decode_dirent,
5588         .read_setup     = nfs4_proc_read_setup,
5589         .read_done      = nfs4_read_done,
5590         .write_setup    = nfs4_proc_write_setup,
5591         .write_done     = nfs4_write_done,
5592         .commit_setup   = nfs4_proc_commit_setup,
5593         .commit_done    = nfs4_commit_done,
5594         .lock           = nfs4_proc_lock,
5595         .clear_acl_cache = nfs4_zap_acl_attr,
5596         .close_context  = nfs4_close_context,
5597         .open_context   = nfs4_atomic_open,
5598 };
5599
5600 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
5601         .prefix = XATTR_NAME_NFSV4_ACL,
5602         .list   = nfs4_xattr_list_nfs4_acl,
5603         .get    = nfs4_xattr_get_nfs4_acl,
5604         .set    = nfs4_xattr_set_nfs4_acl,
5605 };
5606
5607 const struct xattr_handler *nfs4_xattr_handlers[] = {
5608         &nfs4_xattr_nfs4_acl_handler,
5609         NULL
5610 };
5611
5612 /*
5613  * Local variables:
5614  *  c-basic-offset: 8
5615  * End:
5616  */