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_schedule_stateid_recovery(server, state);
 260                         goto wait_on_recovery;
 261                 case -NFS4ERR_STALE_STATEID:
 262                 case -NFS4ERR_STALE_CLIENTID:
 263                 case -NFS4ERR_EXPIRED:
 264                         nfs4_schedule_lease_recovery(clp);
 265                         goto wait_on_recovery;
 266 #if defined(CONFIG_NFS_V4_1)
 267                 case -NFS4ERR_BADSESSION:
 268                 case -NFS4ERR_BADSLOT:
 269                 case -NFS4ERR_BAD_HIGH_SLOT:
 270                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 271                 case -NFS4ERR_DEADSESSION:
 272                 case -NFS4ERR_SEQ_FALSE_RETRY:
 273                 case -NFS4ERR_SEQ_MISORDERED:
 274                         dprintk("%s ERROR: %d Reset session\n", __func__,
 275                                 errorcode);
 276                         nfs4_schedule_session_recovery(clp->cl_session);
 277                         exception->retry = 1;
 278                         break;
 279 #endif /* defined(CONFIG_NFS_V4_1) */
 280                 case -NFS4ERR_FILE_OPEN:
 281                         if (exception->timeout > HZ) {
 282                                 /* We have retried a decent amount, time to
 283                                  * fail
 284                                  */
 285                                 ret = -EBUSY;
 286                                 break;
 287                         }
 288                 case -NFS4ERR_GRACE:
 289                 case -NFS4ERR_DELAY:
 290                 case -EKEYEXPIRED:
 291                         ret = nfs4_delay(server->client, &exception->timeout);
 292                         if (ret != 0)
 293                                 break;
 294                 case -NFS4ERR_OLD_STATEID:
 295                         exception->retry = 1;
 296         }
 297         /* We failed to handle the error */
 298         return nfs4_map_errors(ret);
 299 wait_on_recovery:
 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 (res->sr_status_flags != 0)
 439                         nfs4_schedule_lease_recovery(clp);
 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_session_recovery(server->nfs_client->cl_session);
1259                                 goto out;
1260                         case -NFS4ERR_STALE_CLIENTID:
1261                         case -NFS4ERR_STALE_STATEID:
1262                         case -NFS4ERR_EXPIRED:
1263                                 /* Don't recall a delegation if it was lost */
1264                                 nfs4_schedule_lease_recovery(server->nfs_client);
1265                                 goto out;
1266                         case -ERESTARTSYS:
1267                                 /*
1268                                  * The show must go on: exit, but mark the
1269                                  * stateid as needing recovery.
1270                                  */
1271                         case -NFS4ERR_ADMIN_REVOKED:
1272                         case -NFS4ERR_BAD_STATEID:
1273                                 nfs4_schedule_stateid_recovery(server, state);
1274                         case -EKEYEXPIRED:
1275                                 /*
1276                                  * User RPCSEC_GSS context has expired.
1277                                  * We cannot recover this stateid now, so
1278                                  * skip it and allow recovery thread to
1279                                  * proceed.
1280                                  */
1281                         case -ENOMEM:
1282                                 err = 0;
1283                                 goto out;
1284                 }
1285                 err = nfs4_handle_exception(server, err, &exception);
1286         } while (exception.retry);
1287 out:
1288         return err;
1289 }
1290
1291 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1292 {
1293         struct nfs4_opendata *data = calldata;
1294
1295         data->rpc_status = task->tk_status;
1296         if (data->rpc_status == 0) {
1297                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1298                                 sizeof(data->o_res.stateid.data));
1299                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1300                 renew_lease(data->o_res.server, data->timestamp);
1301                 data->rpc_done = 1;
1302         }
1303 }
1304
1305 static void nfs4_open_confirm_release(void *calldata)
1306 {
1307         struct nfs4_opendata *data = calldata;
1308         struct nfs4_state *state = NULL;
1309
1310         /* If this request hasn't been cancelled, do nothing */
1311         if (data->cancelled == 0)
1312                 goto out_free;
1313         /* In case of error, no cleanup! */
1314         if (!data->rpc_done)
1315                 goto out_free;
1316         state = nfs4_opendata_to_nfs4_state(data);
1317         if (!IS_ERR(state))
1318                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1319 out_free:
1320         nfs4_opendata_put(data);
1321 }
1322
1323 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1324         .rpc_call_done = nfs4_open_confirm_done,
1325         .rpc_release = nfs4_open_confirm_release,
1326 };
1327
1328 /*
1329  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1330  */
1331 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1332 {
1333         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1334         struct rpc_task *task;
1335         struct  rpc_message msg = {
1336                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1337                 .rpc_argp = &data->c_arg,
1338                 .rpc_resp = &data->c_res,
1339                 .rpc_cred = data->owner->so_cred,
1340         };
1341         struct rpc_task_setup task_setup_data = {
1342                 .rpc_client = server->client,
1343                 .rpc_message = &msg,
1344                 .callback_ops = &nfs4_open_confirm_ops,
1345                 .callback_data = data,
1346                 .workqueue = nfsiod_workqueue,
1347                 .flags = RPC_TASK_ASYNC,
1348         };
1349         int status;
1350
1351         kref_get(&data->kref);
1352         data->rpc_done = 0;
1353         data->rpc_status = 0;
1354         data->timestamp = jiffies;
1355         task = rpc_run_task(&task_setup_data);
1356         if (IS_ERR(task))
1357                 return PTR_ERR(task);
1358         status = nfs4_wait_for_completion_rpc_task(task);
1359         if (status != 0) {
1360                 data->cancelled = 1;
1361                 smp_wmb();
1362         } else
1363                 status = data->rpc_status;
1364         rpc_put_task(task);
1365         return status;
1366 }
1367
1368 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1369 {
1370         struct nfs4_opendata *data = calldata;
1371         struct nfs4_state_owner *sp = data->owner;
1372
1373         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1374                 return;
1375         /*
1376          * Check if we still need to send an OPEN call, or if we can use
1377          * a delegation instead.
1378          */
1379         if (data->state != NULL) {
1380                 struct nfs_delegation *delegation;
1381
1382                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1383                         goto out_no_action;
1384                 rcu_read_lock();
1385                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1386                 if (delegation != NULL &&
1387                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1388                         rcu_read_unlock();
1389                         goto out_no_action;
1390                 }
1391                 rcu_read_unlock();
1392         }
1393         /* Update sequence id. */
1394         data->o_arg.id = sp->so_owner_id.id;
1395         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1396         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1397                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1398                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1399         }
1400         data->timestamp = jiffies;
1401         if (nfs4_setup_sequence(data->o_arg.server,
1402                                 &data->o_arg.seq_args,
1403                                 &data->o_res.seq_res, 1, task))
1404                 return;
1405         rpc_call_start(task);
1406         return;
1407 out_no_action:
1408         task->tk_action = NULL;
1409
1410 }
1411
1412 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1413 {
1414         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1415         nfs4_open_prepare(task, calldata);
1416 }
1417
1418 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1419 {
1420         struct nfs4_opendata *data = calldata;
1421
1422         data->rpc_status = task->tk_status;
1423
1424         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1425                 return;
1426
1427         if (task->tk_status == 0) {
1428                 switch (data->o_res.f_attr->mode & S_IFMT) {
1429                         case S_IFREG:
1430                                 break;
1431                         case S_IFLNK:
1432                                 data->rpc_status = -ELOOP;
1433                                 break;
1434                         case S_IFDIR:
1435                                 data->rpc_status = -EISDIR;
1436                                 break;
1437                         default:
1438                                 data->rpc_status = -ENOTDIR;
1439                 }
1440                 renew_lease(data->o_res.server, data->timestamp);
1441                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1442                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1443         }
1444         data->rpc_done = 1;
1445 }
1446
1447 static void nfs4_open_release(void *calldata)
1448 {
1449         struct nfs4_opendata *data = calldata;
1450         struct nfs4_state *state = NULL;
1451
1452         /* If this request hasn't been cancelled, do nothing */
1453         if (data->cancelled == 0)
1454                 goto out_free;
1455         /* In case of error, no cleanup! */
1456         if (data->rpc_status != 0 || !data->rpc_done)
1457                 goto out_free;
1458         /* In case we need an open_confirm, no cleanup! */
1459         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1460                 goto out_free;
1461         state = nfs4_opendata_to_nfs4_state(data);
1462         if (!IS_ERR(state))
1463                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1464 out_free:
1465         nfs4_opendata_put(data);
1466 }
1467
1468 static const struct rpc_call_ops nfs4_open_ops = {
1469         .rpc_call_prepare = nfs4_open_prepare,
1470         .rpc_call_done = nfs4_open_done,
1471         .rpc_release = nfs4_open_release,
1472 };
1473
1474 static const struct rpc_call_ops nfs4_recover_open_ops = {
1475         .rpc_call_prepare = nfs4_recover_open_prepare,
1476         .rpc_call_done = nfs4_open_done,
1477         .rpc_release = nfs4_open_release,
1478 };
1479
1480 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1481 {
1482         struct inode *dir = data->dir->d_inode;
1483         struct nfs_server *server = NFS_SERVER(dir);
1484         struct nfs_openargs *o_arg = &data->o_arg;
1485         struct nfs_openres *o_res = &data->o_res;
1486         struct rpc_task *task;
1487         struct rpc_message msg = {
1488                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1489                 .rpc_argp = o_arg,
1490                 .rpc_resp = o_res,
1491                 .rpc_cred = data->owner->so_cred,
1492         };
1493         struct rpc_task_setup task_setup_data = {
1494                 .rpc_client = server->client,
1495                 .rpc_message = &msg,
1496                 .callback_ops = &nfs4_open_ops,
1497                 .callback_data = data,
1498                 .workqueue = nfsiod_workqueue,
1499                 .flags = RPC_TASK_ASYNC,
1500         };
1501         int status;
1502
1503         kref_get(&data->kref);
1504         data->rpc_done = 0;
1505         data->rpc_status = 0;
1506         data->cancelled = 0;
1507         if (isrecover)
1508                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1509         task = rpc_run_task(&task_setup_data);
1510         if (IS_ERR(task))
1511                 return PTR_ERR(task);
1512         status = nfs4_wait_for_completion_rpc_task(task);
1513         if (status != 0) {
1514                 data->cancelled = 1;
1515                 smp_wmb();
1516         } else
1517                 status = data->rpc_status;
1518         rpc_put_task(task);
1519
1520         return status;
1521 }
1522
1523 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1524 {
1525         struct inode *dir = data->dir->d_inode;
1526         struct nfs_openres *o_res = &data->o_res;
1527         int status;
1528
1529         status = nfs4_run_open_task(data, 1);
1530         if (status != 0 || !data->rpc_done)
1531                 return status;
1532
1533         nfs_refresh_inode(dir, o_res->dir_attr);
1534
1535         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1536                 status = _nfs4_proc_open_confirm(data);
1537                 if (status != 0)
1538                         return status;
1539         }
1540
1541         return status;
1542 }
1543
1544 /*
1545  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1546  */
1547 static int _nfs4_proc_open(struct nfs4_opendata *data)
1548 {
1549         struct inode *dir = data->dir->d_inode;
1550         struct nfs_server *server = NFS_SERVER(dir);
1551         struct nfs_openargs *o_arg = &data->o_arg;
1552         struct nfs_openres *o_res = &data->o_res;
1553         int status;
1554
1555         status = nfs4_run_open_task(data, 0);
1556         if (status != 0 || !data->rpc_done)
1557                 return status;
1558
1559         if (o_arg->open_flags & O_CREAT) {
1560                 update_changeattr(dir, &o_res->cinfo);
1561                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1562         } else
1563                 nfs_refresh_inode(dir, o_res->dir_attr);
1564         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1565                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1566         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1567                 status = _nfs4_proc_open_confirm(data);
1568                 if (status != 0)
1569                         return status;
1570         }
1571         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1572                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1573         return 0;
1574 }
1575
1576 static int nfs4_recover_expired_lease(struct nfs_server *server)
1577 {
1578         struct nfs_client *clp = server->nfs_client;
1579         unsigned int loop;
1580         int ret;
1581
1582         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1583                 ret = nfs4_wait_clnt_recover(clp);
1584                 if (ret != 0)
1585                         break;
1586                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1587                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1588                         break;
1589                 nfs4_schedule_state_manager(clp);
1590                 ret = -EIO;
1591         }
1592         return ret;
1593 }
1594
1595 /*
1596  * OPEN_EXPIRED:
1597  *      reclaim state on the server after a network partition.
1598  *      Assumes caller holds the appropriate lock
1599  */
1600 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1601 {
1602         struct nfs4_opendata *opendata;
1603         int ret;
1604
1605         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1606         if (IS_ERR(opendata))
1607                 return PTR_ERR(opendata);
1608         ret = nfs4_open_recover(opendata, state);
1609         if (ret == -ESTALE)
1610                 d_drop(ctx->path.dentry);
1611         nfs4_opendata_put(opendata);
1612         return ret;
1613 }
1614
1615 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1616 {
1617         struct nfs_server *server = NFS_SERVER(state->inode);
1618         struct nfs4_exception exception = { };
1619         int err;
1620
1621         do {
1622                 err = _nfs4_open_expired(ctx, state);
1623                 switch (err) {
1624                 default:
1625                         goto out;
1626                 case -NFS4ERR_GRACE:
1627                 case -NFS4ERR_DELAY:
1628                         nfs4_handle_exception(server, err, &exception);
1629                         err = 0;
1630                 }
1631         } while (exception.retry);
1632 out:
1633         return err;
1634 }
1635
1636 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1637 {
1638         struct nfs_open_context *ctx;
1639         int ret;
1640
1641         ctx = nfs4_state_find_open_context(state);
1642         if (IS_ERR(ctx))
1643                 return PTR_ERR(ctx);
1644         ret = nfs4_do_open_expired(ctx, state);
1645         put_nfs_open_context(ctx);
1646         return ret;
1647 }
1648
1649 /*
1650  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1651  * fields corresponding to attributes that were used to store the verifier.
1652  * Make sure we clobber those fields in the later setattr call
1653  */
1654 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1655 {
1656         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1657             !(sattr->ia_valid & ATTR_ATIME_SET))
1658                 sattr->ia_valid |= ATTR_ATIME;
1659
1660         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1661             !(sattr->ia_valid & ATTR_MTIME_SET))
1662                 sattr->ia_valid |= ATTR_MTIME;
1663 }
1664
1665 /*
1666  * Returns a referenced nfs4_state
1667  */
1668 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1669 {
1670         struct nfs4_state_owner  *sp;
1671         struct nfs4_state     *state = NULL;
1672         struct nfs_server       *server = NFS_SERVER(dir);
1673         struct nfs4_opendata *opendata;
1674         int status;
1675
1676         /* Protect against reboot recovery conflicts */
1677         status = -ENOMEM;
1678         if (!(sp = nfs4_get_state_owner(server, cred))) {
1679                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1680                 goto out_err;
1681         }
1682         status = nfs4_recover_expired_lease(server);
1683         if (status != 0)
1684                 goto err_put_state_owner;
1685         if (path->dentry->d_inode != NULL)
1686                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1687         status = -ENOMEM;
1688         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1689         if (opendata == NULL)
1690                 goto err_put_state_owner;
1691
1692         if (path->dentry->d_inode != NULL)
1693                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1694
1695         status = _nfs4_proc_open(opendata);
1696         if (status != 0)
1697                 goto err_opendata_put;
1698
1699         state = nfs4_opendata_to_nfs4_state(opendata);
1700         status = PTR_ERR(state);
1701         if (IS_ERR(state))
1702                 goto err_opendata_put;
1703         if (server->caps & NFS_CAP_POSIX_LOCK)
1704                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1705
1706         if (opendata->o_arg.open_flags & O_EXCL) {
1707                 nfs4_exclusive_attrset(opendata, sattr);
1708
1709                 nfs_fattr_init(opendata->o_res.f_attr);
1710                 status = nfs4_do_setattr(state->inode, cred,
1711                                 opendata->o_res.f_attr, sattr,
1712                                 state);
1713                 if (status == 0)
1714                         nfs_setattr_update_inode(state->inode, sattr);
1715                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1716         }
1717         nfs4_opendata_put(opendata);
1718         nfs4_put_state_owner(sp);
1719         *res = state;
1720         return 0;
1721 err_opendata_put:
1722         nfs4_opendata_put(opendata);
1723 err_put_state_owner:
1724         nfs4_put_state_owner(sp);
1725 out_err:
1726         *res = NULL;
1727         return status;
1728 }
1729
1730
1731 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1732 {
1733         struct nfs4_exception exception = { };
1734         struct nfs4_state *res;
1735         int status;
1736
1737         do {
1738                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1739                 if (status == 0)
1740                         break;
1741                 /* NOTE: BAD_SEQID means the server and client disagree about the
1742                  * book-keeping w.r.t. state-changing operations
1743                  * (OPEN/CLOSE/LOCK/LOCKU...)
1744                  * It is actually a sign of a bug on the client or on the server.
1745                  *
1746                  * If we receive a BAD_SEQID error in the particular case of
1747                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1748                  * have unhashed the old state_owner for us, and that we can
1749                  * therefore safely retry using a new one. We should still warn
1750                  * the user though...
1751                  */
1752                 if (status == -NFS4ERR_BAD_SEQID) {
1753                         printk(KERN_WARNING "NFS: v4 server %s "
1754                                         " returned a bad sequence-id error!\n",
1755                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1756                         exception.retry = 1;
1757                         continue;
1758                 }
1759                 /*
1760                  * BAD_STATEID on OPEN means that the server cancelled our
1761                  * state before it received the OPEN_CONFIRM.
1762                  * Recover by retrying the request as per the discussion
1763                  * on Page 181 of RFC3530.
1764                  */
1765                 if (status == -NFS4ERR_BAD_STATEID) {
1766                         exception.retry = 1;
1767                         continue;
1768                 }
1769                 if (status == -EAGAIN) {
1770                         /* We must have found a delegation */
1771                         exception.retry = 1;
1772                         continue;
1773                 }
1774                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1775                                         status, &exception));
1776         } while (exception.retry);
1777         return res;
1778 }
1779
1780 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1781                             struct nfs_fattr *fattr, struct iattr *sattr,
1782                             struct nfs4_state *state)
1783 {
1784         struct nfs_server *server = NFS_SERVER(inode);
1785         struct nfs_setattrargs  arg = {
1786                 .fh             = NFS_FH(inode),
1787                 .iap            = sattr,
1788                 .server         = server,
1789                 .bitmask = server->attr_bitmask,
1790         };
1791         struct nfs_setattrres  res = {
1792                 .fattr          = fattr,
1793                 .server         = server,
1794         };
1795         struct rpc_message msg = {
1796                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1797                 .rpc_argp       = &arg,
1798                 .rpc_resp       = &res,
1799                 .rpc_cred       = cred,
1800         };
1801         unsigned long timestamp = jiffies;
1802         int status;
1803
1804         nfs_fattr_init(fattr);
1805
1806         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1807                 /* Use that stateid */
1808         } else if (state != NULL) {
1809                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1810         } else
1811                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1812
1813         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1814         if (status == 0 && state != NULL)
1815                 renew_lease(server, timestamp);
1816         return status;
1817 }
1818
1819 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1820                            struct nfs_fattr *fattr, struct iattr *sattr,
1821                            struct nfs4_state *state)
1822 {
1823         struct nfs_server *server = NFS_SERVER(inode);
1824         struct nfs4_exception exception = { };
1825         int err;
1826         do {
1827                 err = nfs4_handle_exception(server,
1828                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1829                                 &exception);
1830         } while (exception.retry);
1831         return err;
1832 }
1833
1834 struct nfs4_closedata {
1835         struct path path;
1836         struct inode *inode;
1837         struct nfs4_state *state;
1838         struct nfs_closeargs arg;
1839         struct nfs_closeres res;
1840         struct nfs_fattr fattr;
1841         unsigned long timestamp;
1842         bool roc;
1843         u32 roc_barrier;
1844 };
1845
1846 static void nfs4_free_closedata(void *data)
1847 {
1848         struct nfs4_closedata *calldata = data;
1849         struct nfs4_state_owner *sp = calldata->state->owner;
1850
1851         if (calldata->roc)
1852                 pnfs_roc_release(calldata->state->inode);
1853         nfs4_put_open_state(calldata->state);
1854         nfs_free_seqid(calldata->arg.seqid);
1855         nfs4_put_state_owner(sp);
1856         path_put(&calldata->path);
1857         kfree(calldata);
1858 }
1859
1860 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1861                 fmode_t fmode)
1862 {
1863         spin_lock(&state->owner->so_lock);
1864         if (!(fmode & FMODE_READ))
1865                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1866         if (!(fmode & FMODE_WRITE))
1867                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1868         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1869         spin_unlock(&state->owner->so_lock);
1870 }
1871
1872 static void nfs4_close_done(struct rpc_task *task, void *data)
1873 {
1874         struct nfs4_closedata *calldata = data;
1875         struct nfs4_state *state = calldata->state;
1876         struct nfs_server *server = NFS_SERVER(calldata->inode);
1877
1878         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1879                 return;
1880         /* hmm. we are done with the inode, and in the process of freeing
1881          * the state_owner. we keep this around to process errors
1882          */
1883         switch (task->tk_status) {
1884                 case 0:
1885                         if (calldata->roc)
1886                                 pnfs_roc_set_barrier(state->inode,
1887                                                      calldata->roc_barrier);
1888                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1889                         renew_lease(server, calldata->timestamp);
1890                         nfs4_close_clear_stateid_flags(state,
1891                                         calldata->arg.fmode);
1892                         break;
1893                 case -NFS4ERR_STALE_STATEID:
1894                 case -NFS4ERR_OLD_STATEID:
1895                 case -NFS4ERR_BAD_STATEID:
1896                 case -NFS4ERR_EXPIRED:
1897                         if (calldata->arg.fmode == 0)
1898                                 break;
1899                 default:
1900                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1901                                 rpc_restart_call_prepare(task);
1902         }
1903         nfs_release_seqid(calldata->arg.seqid);
1904         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1905 }
1906
1907 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1908 {
1909         struct nfs4_closedata *calldata = data;
1910         struct nfs4_state *state = calldata->state;
1911         int call_close = 0;
1912
1913         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1914                 return;
1915
1916         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1917         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1918         spin_lock(&state->owner->so_lock);
1919         /* Calculate the change in open mode */
1920         if (state->n_rdwr == 0) {
1921                 if (state->n_rdonly == 0) {
1922                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1923                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1924                         calldata->arg.fmode &= ~FMODE_READ;
1925                 }
1926                 if (state->n_wronly == 0) {
1927                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1928                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1929                         calldata->arg.fmode &= ~FMODE_WRITE;
1930                 }
1931         }
1932         spin_unlock(&state->owner->so_lock);
1933
1934         if (!call_close) {
1935                 /* Note: exit _without_ calling nfs4_close_done */
1936                 task->tk_action = NULL;
1937                 return;
1938         }
1939
1940         if (calldata->arg.fmode == 0) {
1941                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1942                 if (calldata->roc &&
1943                     pnfs_roc_drain(calldata->inode, &calldata->roc_barrier)) {
1944                         rpc_sleep_on(&NFS_SERVER(calldata->inode)->roc_rpcwaitq,
1945                                      task, NULL);
1946                         return;
1947                 }
1948         }
1949
1950         nfs_fattr_init(calldata->res.fattr);
1951         calldata->timestamp = jiffies;
1952         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1953                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1954                                 1, task))
1955                 return;
1956         rpc_call_start(task);
1957 }
1958
1959 static const struct rpc_call_ops nfs4_close_ops = {
1960         .rpc_call_prepare = nfs4_close_prepare,
1961         .rpc_call_done = nfs4_close_done,
1962         .rpc_release = nfs4_free_closedata,
1963 };
1964
1965 /*
1966  * It is possible for data to be read/written from a mem-mapped file
1967  * after the sys_close call (which hits the vfs layer as a flush).
1968  * This means that we can't safely call nfsv4 close on a file until
1969  * the inode is cleared. This in turn means that we are not good
1970  * NFSv4 citizens - we do not indicate to the server to update the file's
1971  * share state even when we are done with one of the three share
1972  * stateid's in the inode.
1973  *
1974  * NOTE: Caller must be holding the sp->so_owner semaphore!
1975  */
1976 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait, bool roc)
1977 {
1978         struct nfs_server *server = NFS_SERVER(state->inode);
1979         struct nfs4_closedata *calldata;
1980         struct nfs4_state_owner *sp = state->owner;
1981         struct rpc_task *task;
1982         struct rpc_message msg = {
1983                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1984                 .rpc_cred = state->owner->so_cred,
1985         };
1986         struct rpc_task_setup task_setup_data = {
1987                 .rpc_client = server->client,
1988                 .rpc_message = &msg,
1989                 .callback_ops = &nfs4_close_ops,
1990                 .workqueue = nfsiod_workqueue,
1991                 .flags = RPC_TASK_ASYNC,
1992         };
1993         int status = -ENOMEM;
1994
1995         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1996         if (calldata == NULL)
1997                 goto out;
1998         calldata->inode = state->inode;
1999         calldata->state = state;
2000         calldata->arg.fh = NFS_FH(state->inode);
2001         calldata->arg.stateid = &state->open_stateid;
2002         /* Serialization for the sequence id */
2003         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2004         if (calldata->arg.seqid == NULL)
2005                 goto out_free_calldata;
2006         calldata->arg.fmode = 0;
2007         calldata->arg.bitmask = server->cache_consistency_bitmask;
2008         calldata->res.fattr = &calldata->fattr;
2009         calldata->res.seqid = calldata->arg.seqid;
2010         calldata->res.server = server;
2011         calldata->roc = roc;
2012         path_get(path);
2013         calldata->path = *path;
2014
2015         msg.rpc_argp = &calldata->arg;
2016         msg.rpc_resp = &calldata->res;
2017         task_setup_data.callback_data = calldata;
2018         task = rpc_run_task(&task_setup_data);
2019         if (IS_ERR(task))
2020                 return PTR_ERR(task);
2021         status = 0;
2022         if (wait)
2023                 status = rpc_wait_for_completion_task(task);
2024         rpc_put_task(task);
2025         return status;
2026 out_free_calldata:
2027         kfree(calldata);
2028 out:
2029         if (roc)
2030                 pnfs_roc_release(state->inode);
2031         nfs4_put_open_state(state);
2032         nfs4_put_state_owner(sp);
2033         return status;
2034 }
2035
2036 static struct inode *
2037 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2038 {
2039         struct nfs4_state *state;
2040
2041         /* Protect against concurrent sillydeletes */
2042         state = nfs4_do_open(dir, &ctx->path, ctx->mode, open_flags, attr, ctx->cred);
2043         if (IS_ERR(state))
2044                 return ERR_CAST(state);
2045         ctx->state = state;
2046         return igrab(state->inode);
2047 }
2048
2049 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2050 {
2051         if (ctx->state == NULL)
2052                 return;
2053         if (is_sync)
2054                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2055         else
2056                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2057 }
2058
2059 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2060 {
2061         struct nfs4_server_caps_arg args = {
2062                 .fhandle = fhandle,
2063         };
2064         struct nfs4_server_caps_res res = {};
2065         struct rpc_message msg = {
2066                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2067                 .rpc_argp = &args,
2068                 .rpc_resp = &res,
2069         };
2070         int status;
2071
2072         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2073         if (status == 0) {
2074                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2075                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2076                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2077                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2078                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2079                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2080                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2081                         server->caps |= NFS_CAP_ACLS;
2082                 if (res.has_links != 0)
2083                         server->caps |= NFS_CAP_HARDLINKS;
2084                 if (res.has_symlinks != 0)
2085                         server->caps |= NFS_CAP_SYMLINKS;
2086                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2087                         server->caps |= NFS_CAP_FILEID;
2088                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2089                         server->caps |= NFS_CAP_MODE;
2090                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2091                         server->caps |= NFS_CAP_NLINK;
2092                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2093                         server->caps |= NFS_CAP_OWNER;
2094                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2095                         server->caps |= NFS_CAP_OWNER_GROUP;
2096                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2097                         server->caps |= NFS_CAP_ATIME;
2098                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2099                         server->caps |= NFS_CAP_CTIME;
2100                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2101                         server->caps |= NFS_CAP_MTIME;
2102
2103                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2104                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2105                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2106                 server->acl_bitmask = res.acl_bitmask;
2107         }
2108
2109         return status;
2110 }
2111
2112 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2113 {
2114         struct nfs4_exception exception = { };
2115         int err;
2116         do {
2117                 err = nfs4_handle_exception(server,
2118                                 _nfs4_server_capabilities(server, fhandle),
2119                                 &exception);
2120         } while (exception.retry);
2121         return err;
2122 }
2123
2124 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2125                 struct nfs_fsinfo *info)
2126 {
2127         struct nfs4_lookup_root_arg args = {
2128                 .bitmask = nfs4_fattr_bitmap,
2129         };
2130         struct nfs4_lookup_res res = {
2131                 .server = server,
2132                 .fattr = info->fattr,
2133                 .fh = fhandle,
2134         };
2135         struct rpc_message msg = {
2136                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2137                 .rpc_argp = &args,
2138                 .rpc_resp = &res,
2139         };
2140
2141         nfs_fattr_init(info->fattr);
2142         return nfs4_call_sync(server, &msg, &args, &res, 0);
2143 }
2144
2145 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2146                 struct nfs_fsinfo *info)
2147 {
2148         struct nfs4_exception exception = { };
2149         int err;
2150         do {
2151                 err = nfs4_handle_exception(server,
2152                                 _nfs4_lookup_root(server, fhandle, info),
2153                                 &exception);
2154         } while (exception.retry);
2155         return err;
2156 }
2157
2158 /*
2159  * get the file handle for the "/" directory on the server
2160  */
2161 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2162                               struct nfs_fsinfo *info)
2163 {
2164         int status;
2165
2166         status = nfs4_lookup_root(server, fhandle, info);
2167         if (status == 0)
2168                 status = nfs4_server_capabilities(server, fhandle);
2169         if (status == 0)
2170                 status = nfs4_do_fsinfo(server, fhandle, info);
2171         return nfs4_map_errors(status);
2172 }
2173
2174 /*
2175  * Get locations and (maybe) other attributes of a referral.
2176  * Note that we'll actually follow the referral later when
2177  * we detect fsid mismatch in inode revalidation
2178  */
2179 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2180 {
2181         int status = -ENOMEM;
2182         struct page *page = NULL;
2183         struct nfs4_fs_locations *locations = NULL;
2184
2185         page = alloc_page(GFP_KERNEL);
2186         if (page == NULL)
2187                 goto out;
2188         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2189         if (locations == NULL)
2190                 goto out;
2191
2192         status = nfs4_proc_fs_locations(dir, name, locations, page);
2193         if (status != 0)
2194                 goto out;
2195         /* Make sure server returned a different fsid for the referral */
2196         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2197                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2198                 status = -EIO;
2199                 goto out;
2200         }
2201
2202         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2203         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2204         if (!fattr->mode)
2205                 fattr->mode = S_IFDIR;
2206         memset(fhandle, 0, sizeof(struct nfs_fh));
2207 out:
2208         if (page)
2209                 __free_page(page);
2210         kfree(locations);
2211         return status;
2212 }
2213
2214 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2215 {
2216         struct nfs4_getattr_arg args = {
2217                 .fh = fhandle,
2218                 .bitmask = server->attr_bitmask,
2219         };
2220         struct nfs4_getattr_res res = {
2221                 .fattr = fattr,
2222                 .server = server,
2223         };
2224         struct rpc_message msg = {
2225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2226                 .rpc_argp = &args,
2227                 .rpc_resp = &res,
2228         };
2229
2230         nfs_fattr_init(fattr);
2231         return nfs4_call_sync(server, &msg, &args, &res, 0);
2232 }
2233
2234 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2235 {
2236         struct nfs4_exception exception = { };
2237         int err;
2238         do {
2239                 err = nfs4_handle_exception(server,
2240                                 _nfs4_proc_getattr(server, fhandle, fattr),
2241                                 &exception);
2242         } while (exception.retry);
2243         return err;
2244 }
2245
2246 /*
2247  * The file is not closed if it is opened due to the a request to change
2248  * the size of the file. The open call will not be needed once the
2249  * VFS layer lookup-intents are implemented.
2250  *
2251  * Close is called when the inode is destroyed.
2252  * If we haven't opened the file for O_WRONLY, we
2253  * need to in the size_change case to obtain a stateid.
2254  *
2255  * Got race?
2256  * Because OPEN is always done by name in nfsv4, it is
2257  * possible that we opened a different file by the same
2258  * name.  We can recognize this race condition, but we
2259  * can't do anything about it besides returning an error.
2260  *
2261  * This will be fixed with VFS changes (lookup-intent).
2262  */
2263 static int
2264 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2265                   struct iattr *sattr)
2266 {
2267         struct inode *inode = dentry->d_inode;
2268         struct rpc_cred *cred = NULL;
2269         struct nfs4_state *state = NULL;
2270         int status;
2271
2272         nfs_fattr_init(fattr);
2273
2274         /* Search for an existing open(O_WRITE) file */
2275         if (sattr->ia_valid & ATTR_FILE) {
2276                 struct nfs_open_context *ctx;
2277
2278                 ctx = nfs_file_open_context(sattr->ia_file);
2279                 if (ctx) {
2280                         cred = ctx->cred;
2281                         state = ctx->state;
2282                 }
2283         }
2284
2285         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2286         if (status == 0)
2287                 nfs_setattr_update_inode(inode, sattr);
2288         return status;
2289 }
2290
2291 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2292                 const struct qstr *name, struct nfs_fh *fhandle,
2293                 struct nfs_fattr *fattr)
2294 {
2295         int                    status;
2296         struct nfs4_lookup_arg args = {
2297                 .bitmask = server->attr_bitmask,
2298                 .dir_fh = dirfh,
2299                 .name = name,
2300         };
2301         struct nfs4_lookup_res res = {
2302                 .server = server,
2303                 .fattr = fattr,
2304                 .fh = fhandle,
2305         };
2306         struct rpc_message msg = {
2307                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2308                 .rpc_argp = &args,
2309                 .rpc_resp = &res,
2310         };
2311
2312         nfs_fattr_init(fattr);
2313
2314         dprintk("NFS call  lookupfh %s\n", name->name);
2315         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2316         dprintk("NFS reply lookupfh: %d\n", status);
2317         return status;
2318 }
2319
2320 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2321                               struct qstr *name, struct nfs_fh *fhandle,
2322                               struct nfs_fattr *fattr)
2323 {
2324         struct nfs4_exception exception = { };
2325         int err;
2326         do {
2327                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2328                 /* FIXME: !!!! */
2329                 if (err == -NFS4ERR_MOVED) {
2330                         err = -EREMOTE;
2331                         break;
2332                 }
2333                 err = nfs4_handle_exception(server, err, &exception);
2334         } while (exception.retry);
2335         return err;
2336 }
2337
2338 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2339                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2340 {
2341         int status;
2342
2343         dprintk("NFS call  lookup %s\n", name->name);
2344         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2345         if (status == -NFS4ERR_MOVED)
2346                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2347         dprintk("NFS reply lookup: %d\n", status);
2348         return status;
2349 }
2350
2351 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2352 {
2353         struct nfs4_exception exception = { };
2354         int err;
2355         do {
2356                 err = nfs4_handle_exception(NFS_SERVER(dir),
2357                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2358                                 &exception);
2359         } while (exception.retry);
2360         return err;
2361 }
2362
2363 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2364 {
2365         struct nfs_server *server = NFS_SERVER(inode);
2366         struct nfs4_accessargs args = {
2367                 .fh = NFS_FH(inode),
2368                 .bitmask = server->attr_bitmask,
2369         };
2370         struct nfs4_accessres res = {
2371                 .server = server,
2372         };
2373         struct rpc_message msg = {
2374                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2375                 .rpc_argp = &args,
2376                 .rpc_resp = &res,
2377                 .rpc_cred = entry->cred,
2378         };
2379         int mode = entry->mask;
2380         int status;
2381
2382         /*
2383          * Determine which access bits we want to ask for...
2384          */
2385         if (mode & MAY_READ)
2386                 args.access |= NFS4_ACCESS_READ;
2387         if (S_ISDIR(inode->i_mode)) {
2388                 if (mode & MAY_WRITE)
2389                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2390                 if (mode & MAY_EXEC)
2391                         args.access |= NFS4_ACCESS_LOOKUP;
2392         } else {
2393                 if (mode & MAY_WRITE)
2394                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2395                 if (mode & MAY_EXEC)
2396                         args.access |= NFS4_ACCESS_EXECUTE;
2397         }
2398
2399         res.fattr = nfs_alloc_fattr();
2400         if (res.fattr == NULL)
2401                 return -ENOMEM;
2402
2403         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2404         if (!status) {
2405                 entry->mask = 0;
2406                 if (res.access & NFS4_ACCESS_READ)
2407                         entry->mask |= MAY_READ;
2408                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2409                         entry->mask |= MAY_WRITE;
2410                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2411                         entry->mask |= MAY_EXEC;
2412                 nfs_refresh_inode(inode, res.fattr);
2413         }
2414         nfs_free_fattr(res.fattr);
2415         return status;
2416 }
2417
2418 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2419 {
2420         struct nfs4_exception exception = { };
2421         int err;
2422         do {
2423                 err = nfs4_handle_exception(NFS_SERVER(inode),
2424                                 _nfs4_proc_access(inode, entry),
2425                                 &exception);
2426         } while (exception.retry);
2427         return err;
2428 }
2429
2430 /*
2431  * TODO: For the time being, we don't try to get any attributes
2432  * along with any of the zero-copy operations READ, READDIR,
2433  * READLINK, WRITE.
2434  *
2435  * In the case of the first three, we want to put the GETATTR
2436  * after the read-type operation -- this is because it is hard
2437  * to predict the length of a GETATTR response in v4, and thus
2438  * align the READ data correctly.  This means that the GETATTR
2439  * may end up partially falling into the page cache, and we should
2440  * shift it into the 'tail' of the xdr_buf before processing.
2441  * To do this efficiently, we need to know the total length
2442  * of data received, which doesn't seem to be available outside
2443  * of the RPC layer.
2444  *
2445  * In the case of WRITE, we also want to put the GETATTR after
2446  * the operation -- in this case because we want to make sure
2447  * we get the post-operation mtime and size.  This means that
2448  * we can't use xdr_encode_pages() as written: we need a variant
2449  * of it which would leave room in the 'tail' iovec.
2450  *
2451  * Both of these changes to the XDR layer would in fact be quite
2452  * minor, but I decided to leave them for a subsequent patch.
2453  */
2454 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2455                 unsigned int pgbase, unsigned int pglen)
2456 {
2457         struct nfs4_readlink args = {
2458                 .fh       = NFS_FH(inode),
2459                 .pgbase   = pgbase,
2460                 .pglen    = pglen,
2461                 .pages    = &page,
2462         };
2463         struct nfs4_readlink_res res;
2464         struct rpc_message msg = {
2465                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2466                 .rpc_argp = &args,
2467                 .rpc_resp = &res,
2468         };
2469
2470         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2471 }
2472
2473 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2474                 unsigned int pgbase, unsigned int pglen)
2475 {
2476         struct nfs4_exception exception = { };
2477         int err;
2478         do {
2479                 err = nfs4_handle_exception(NFS_SERVER(inode),
2480                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2481                                 &exception);
2482         } while (exception.retry);
2483         return err;
2484 }
2485
2486 /*
2487  * Got race?
2488  * We will need to arrange for the VFS layer to provide an atomic open.
2489  * Until then, this create/open method is prone to inefficiency and race
2490  * conditions due to the lookup, create, and open VFS calls from sys_open()
2491  * placed on the wire.
2492  *
2493  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2494  * The file will be opened again in the subsequent VFS open call
2495  * (nfs4_proc_file_open).
2496  *
2497  * The open for read will just hang around to be used by any process that
2498  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2499  */
2500
2501 static int
2502 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2503                  int flags, struct nfs_open_context *ctx)
2504 {
2505         struct path my_path = {
2506                 .dentry = dentry,
2507         };
2508         struct path *path = &my_path;
2509         struct nfs4_state *state;
2510         struct rpc_cred *cred = NULL;
2511         fmode_t fmode = 0;
2512         int status = 0;
2513
2514         if (ctx != NULL) {
2515                 cred = ctx->cred;
2516                 path = &ctx->path;
2517                 fmode = ctx->mode;
2518         }
2519         sattr->ia_mode &= ~current_umask();
2520         state = nfs4_do_open(dir, path, fmode, flags, sattr, cred);
2521         d_drop(dentry);
2522         if (IS_ERR(state)) {
2523                 status = PTR_ERR(state);
2524                 goto out;
2525         }
2526         d_add(dentry, igrab(state->inode));
2527         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2528         if (ctx != NULL)
2529                 ctx->state = state;
2530         else
2531                 nfs4_close_sync(path, state, fmode);
2532 out:
2533         return status;
2534 }
2535
2536 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2537 {
2538         struct nfs_server *server = NFS_SERVER(dir);
2539         struct nfs_removeargs args = {
2540                 .fh = NFS_FH(dir),
2541                 .name.len = name->len,
2542                 .name.name = name->name,
2543                 .bitmask = server->attr_bitmask,
2544         };
2545         struct nfs_removeres res = {
2546                 .server = server,
2547         };
2548         struct rpc_message msg = {
2549                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2550                 .rpc_argp = &args,
2551                 .rpc_resp = &res,
2552         };
2553         int status = -ENOMEM;
2554
2555         res.dir_attr = nfs_alloc_fattr();
2556         if (res.dir_attr == NULL)
2557                 goto out;
2558
2559         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2560         if (status == 0) {
2561                 update_changeattr(dir, &res.cinfo);
2562                 nfs_post_op_update_inode(dir, res.dir_attr);
2563         }
2564         nfs_free_fattr(res.dir_attr);
2565 out:
2566         return status;
2567 }
2568
2569 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2570 {
2571         struct nfs4_exception exception = { };
2572         int err;
2573         do {
2574                 err = nfs4_handle_exception(NFS_SERVER(dir),
2575                                 _nfs4_proc_remove(dir, name),
2576                                 &exception);
2577         } while (exception.retry);
2578         return err;
2579 }
2580
2581 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2582 {
2583         struct nfs_server *server = NFS_SERVER(dir);
2584         struct nfs_removeargs *args = msg->rpc_argp;
2585         struct nfs_removeres *res = msg->rpc_resp;
2586
2587         args->bitmask = server->cache_consistency_bitmask;
2588         res->server = server;
2589         res->seq_res.sr_slot = NULL;
2590         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2591 }
2592
2593 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2594 {
2595         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2596
2597         if (!nfs4_sequence_done(task, &res->seq_res))
2598                 return 0;
2599         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2600                 return 0;
2601         update_changeattr(dir, &res->cinfo);
2602         nfs_post_op_update_inode(dir, res->dir_attr);
2603         return 1;
2604 }
2605
2606 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2607 {
2608         struct nfs_server *server = NFS_SERVER(dir);
2609         struct nfs_renameargs *arg = msg->rpc_argp;
2610         struct nfs_renameres *res = msg->rpc_resp;
2611
2612         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2613         arg->bitmask = server->attr_bitmask;
2614         res->server = server;
2615 }
2616
2617 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2618                                  struct inode *new_dir)
2619 {
2620         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2621
2622         if (!nfs4_sequence_done(task, &res->seq_res))
2623                 return 0;
2624         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2625                 return 0;
2626
2627         update_changeattr(old_dir, &res->old_cinfo);
2628         nfs_post_op_update_inode(old_dir, res->old_fattr);
2629         update_changeattr(new_dir, &res->new_cinfo);
2630         nfs_post_op_update_inode(new_dir, res->new_fattr);
2631         return 1;
2632 }
2633
2634 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2635                 struct inode *new_dir, struct qstr *new_name)
2636 {
2637         struct nfs_server *server = NFS_SERVER(old_dir);
2638         struct nfs_renameargs arg = {
2639                 .old_dir = NFS_FH(old_dir),
2640                 .new_dir = NFS_FH(new_dir),
2641                 .old_name = old_name,
2642                 .new_name = new_name,
2643                 .bitmask = server->attr_bitmask,
2644         };
2645         struct nfs_renameres res = {
2646                 .server = server,
2647         };
2648         struct rpc_message msg = {
2649                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2650                 .rpc_argp = &arg,
2651                 .rpc_resp = &res,
2652         };
2653         int status = -ENOMEM;
2654
2655         res.old_fattr = nfs_alloc_fattr();
2656         res.new_fattr = nfs_alloc_fattr();
2657         if (res.old_fattr == NULL || res.new_fattr == NULL)
2658                 goto out;
2659
2660         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2661         if (!status) {
2662                 update_changeattr(old_dir, &res.old_cinfo);
2663                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2664                 update_changeattr(new_dir, &res.new_cinfo);
2665                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2666         }
2667 out:
2668         nfs_free_fattr(res.new_fattr);
2669         nfs_free_fattr(res.old_fattr);
2670         return status;
2671 }
2672
2673 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2674                 struct inode *new_dir, struct qstr *new_name)
2675 {
2676         struct nfs4_exception exception = { };
2677         int err;
2678         do {
2679                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2680                                 _nfs4_proc_rename(old_dir, old_name,
2681                                         new_dir, new_name),
2682                                 &exception);
2683         } while (exception.retry);
2684         return err;
2685 }
2686
2687 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2688 {
2689         struct nfs_server *server = NFS_SERVER(inode);
2690         struct nfs4_link_arg arg = {
2691                 .fh     = NFS_FH(inode),
2692                 .dir_fh = NFS_FH(dir),
2693                 .name   = name,
2694                 .bitmask = server->attr_bitmask,
2695         };
2696         struct nfs4_link_res res = {
2697                 .server = server,
2698         };
2699         struct rpc_message msg = {
2700                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2701                 .rpc_argp = &arg,
2702                 .rpc_resp = &res,
2703         };
2704         int status = -ENOMEM;
2705
2706         res.fattr = nfs_alloc_fattr();
2707         res.dir_attr = nfs_alloc_fattr();
2708         if (res.fattr == NULL || res.dir_attr == NULL)
2709                 goto out;
2710
2711         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2712         if (!status) {
2713                 update_changeattr(dir, &res.cinfo);
2714                 nfs_post_op_update_inode(dir, res.dir_attr);
2715                 nfs_post_op_update_inode(inode, res.fattr);
2716         }
2717 out:
2718         nfs_free_fattr(res.dir_attr);
2719         nfs_free_fattr(res.fattr);
2720         return status;
2721 }
2722
2723 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2724 {
2725         struct nfs4_exception exception = { };
2726         int err;
2727         do {
2728                 err = nfs4_handle_exception(NFS_SERVER(inode),
2729                                 _nfs4_proc_link(inode, dir, name),
2730                                 &exception);
2731         } while (exception.retry);
2732         return err;
2733 }
2734
2735 struct nfs4_createdata {
2736         struct rpc_message msg;
2737         struct nfs4_create_arg arg;
2738         struct nfs4_create_res res;
2739         struct nfs_fh fh;
2740         struct nfs_fattr fattr;
2741         struct nfs_fattr dir_fattr;
2742 };
2743
2744 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2745                 struct qstr *name, struct iattr *sattr, u32 ftype)
2746 {
2747         struct nfs4_createdata *data;
2748
2749         data = kzalloc(sizeof(*data), GFP_KERNEL);
2750         if (data != NULL) {
2751                 struct nfs_server *server = NFS_SERVER(dir);
2752
2753                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2754                 data->msg.rpc_argp = &data->arg;
2755                 data->msg.rpc_resp = &data->res;
2756                 data->arg.dir_fh = NFS_FH(dir);
2757                 data->arg.server = server;
2758                 data->arg.name = name;
2759                 data->arg.attrs = sattr;
2760                 data->arg.ftype = ftype;
2761                 data->arg.bitmask = server->attr_bitmask;
2762                 data->res.server = server;
2763                 data->res.fh = &data->fh;
2764                 data->res.fattr = &data->fattr;
2765                 data->res.dir_fattr = &data->dir_fattr;
2766                 nfs_fattr_init(data->res.fattr);
2767                 nfs_fattr_init(data->res.dir_fattr);
2768         }
2769         return data;
2770 }
2771
2772 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2773 {
2774         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2775                                     &data->arg, &data->res, 1);
2776         if (status == 0) {
2777                 update_changeattr(dir, &data->res.dir_cinfo);
2778                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2779                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2780         }
2781         return status;
2782 }
2783
2784 static void nfs4_free_createdata(struct nfs4_createdata *data)
2785 {
2786         kfree(data);
2787 }
2788
2789 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2790                 struct page *page, unsigned int len, struct iattr *sattr)
2791 {
2792         struct nfs4_createdata *data;
2793         int status = -ENAMETOOLONG;
2794
2795         if (len > NFS4_MAXPATHLEN)
2796                 goto out;
2797
2798         status = -ENOMEM;
2799         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2800         if (data == NULL)
2801                 goto out;
2802
2803         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2804         data->arg.u.symlink.pages = &page;
2805         data->arg.u.symlink.len = len;
2806
2807         status = nfs4_do_create(dir, dentry, data);
2808
2809         nfs4_free_createdata(data);
2810 out:
2811         return status;
2812 }
2813
2814 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2815                 struct page *page, unsigned int len, struct iattr *sattr)
2816 {
2817         struct nfs4_exception exception = { };
2818         int err;
2819         do {
2820                 err = nfs4_handle_exception(NFS_SERVER(dir),
2821                                 _nfs4_proc_symlink(dir, dentry, page,
2822                                                         len, sattr),
2823                                 &exception);
2824         } while (exception.retry);
2825         return err;
2826 }
2827
2828 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2829                 struct iattr *sattr)
2830 {
2831         struct nfs4_createdata *data;
2832         int status = -ENOMEM;
2833
2834         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2835         if (data == NULL)
2836                 goto out;
2837
2838         status = nfs4_do_create(dir, dentry, data);
2839
2840         nfs4_free_createdata(data);
2841 out:
2842         return status;
2843 }
2844
2845 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2846                 struct iattr *sattr)
2847 {
2848         struct nfs4_exception exception = { };
2849         int err;
2850
2851         sattr->ia_mode &= ~current_umask();
2852         do {
2853                 err = nfs4_handle_exception(NFS_SERVER(dir),
2854                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2855                                 &exception);
2856         } while (exception.retry);
2857         return err;
2858 }
2859
2860 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2861                 u64 cookie, struct page **pages, unsigned int count, int plus)
2862 {
2863         struct inode            *dir = dentry->d_inode;
2864         struct nfs4_readdir_arg args = {
2865                 .fh = NFS_FH(dir),
2866                 .pages = pages,
2867                 .pgbase = 0,
2868                 .count = count,
2869                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2870                 .plus = plus,
2871         };
2872         struct nfs4_readdir_res res;
2873         struct rpc_message msg = {
2874                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2875                 .rpc_argp = &args,
2876                 .rpc_resp = &res,
2877                 .rpc_cred = cred,
2878         };
2879         int                     status;
2880
2881         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2882                         dentry->d_parent->d_name.name,
2883                         dentry->d_name.name,
2884                         (unsigned long long)cookie);
2885         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2886         res.pgbase = args.pgbase;
2887         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2888         if (status >= 0) {
2889                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2890                 status += args.pgbase;
2891         }
2892
2893         nfs_invalidate_atime(dir);
2894
2895         dprintk("%s: returns %d\n", __func__, status);
2896         return status;
2897 }
2898
2899 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2900                 u64 cookie, struct page **pages, unsigned int count, int plus)
2901 {
2902         struct nfs4_exception exception = { };
2903         int err;
2904         do {
2905                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2906                                 _nfs4_proc_readdir(dentry, cred, cookie,
2907                                         pages, count, plus),
2908                                 &exception);
2909         } while (exception.retry);
2910         return err;
2911 }
2912
2913 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2914                 struct iattr *sattr, dev_t rdev)
2915 {
2916         struct nfs4_createdata *data;
2917         int mode = sattr->ia_mode;
2918         int status = -ENOMEM;
2919
2920         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2921         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2922
2923         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2924         if (data == NULL)
2925                 goto out;
2926
2927         if (S_ISFIFO(mode))
2928                 data->arg.ftype = NF4FIFO;
2929         else if (S_ISBLK(mode)) {
2930                 data->arg.ftype = NF4BLK;
2931                 data->arg.u.device.specdata1 = MAJOR(rdev);
2932                 data->arg.u.device.specdata2 = MINOR(rdev);
2933         }
2934         else if (S_ISCHR(mode)) {
2935                 data->arg.ftype = NF4CHR;
2936                 data->arg.u.device.specdata1 = MAJOR(rdev);
2937                 data->arg.u.device.specdata2 = MINOR(rdev);
2938         }
2939
2940         status = nfs4_do_create(dir, dentry, data);
2941
2942         nfs4_free_createdata(data);
2943 out:
2944         return status;
2945 }
2946
2947 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2948                 struct iattr *sattr, dev_t rdev)
2949 {
2950         struct nfs4_exception exception = { };
2951         int err;
2952
2953         sattr->ia_mode &= ~current_umask();
2954         do {
2955                 err = nfs4_handle_exception(NFS_SERVER(dir),
2956                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2957                                 &exception);
2958         } while (exception.retry);
2959         return err;
2960 }
2961
2962 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2963                  struct nfs_fsstat *fsstat)
2964 {
2965         struct nfs4_statfs_arg args = {
2966                 .fh = fhandle,
2967                 .bitmask = server->attr_bitmask,
2968         };
2969         struct nfs4_statfs_res res = {
2970                 .fsstat = fsstat,
2971         };
2972         struct rpc_message msg = {
2973                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2974                 .rpc_argp = &args,
2975                 .rpc_resp = &res,
2976         };
2977
2978         nfs_fattr_init(fsstat->fattr);
2979         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2980 }
2981
2982 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2983 {
2984         struct nfs4_exception exception = { };
2985         int err;
2986         do {
2987                 err = nfs4_handle_exception(server,
2988                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2989                                 &exception);
2990         } while (exception.retry);
2991         return err;
2992 }
2993
2994 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2995                 struct nfs_fsinfo *fsinfo)
2996 {
2997         struct nfs4_fsinfo_arg args = {
2998                 .fh = fhandle,
2999                 .bitmask = server->attr_bitmask,
3000         };
3001         struct nfs4_fsinfo_res res = {
3002                 .fsinfo = fsinfo,
3003         };
3004         struct rpc_message msg = {
3005                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3006                 .rpc_argp = &args,
3007                 .rpc_resp = &res,
3008         };
3009
3010         return nfs4_call_sync(server, &msg, &args, &res, 0);
3011 }
3012
3013 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3014 {
3015         struct nfs4_exception exception = { };
3016         int err;
3017
3018         do {
3019                 err = nfs4_handle_exception(server,
3020                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3021                                 &exception);
3022         } while (exception.retry);
3023         return err;
3024 }
3025
3026 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3027 {
3028         nfs_fattr_init(fsinfo->fattr);
3029         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3030 }
3031
3032 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3033                 struct nfs_pathconf *pathconf)
3034 {
3035         struct nfs4_pathconf_arg args = {
3036                 .fh = fhandle,
3037                 .bitmask = server->attr_bitmask,
3038         };
3039         struct nfs4_pathconf_res res = {
3040                 .pathconf = pathconf,
3041         };
3042         struct rpc_message msg = {
3043                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3044                 .rpc_argp = &args,
3045                 .rpc_resp = &res,
3046         };
3047
3048         /* None of the pathconf attributes are mandatory to implement */
3049         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3050                 memset(pathconf, 0, sizeof(*pathconf));
3051                 return 0;
3052         }
3053
3054         nfs_fattr_init(pathconf->fattr);
3055         return nfs4_call_sync(server, &msg, &args, &res, 0);
3056 }
3057
3058 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3059                 struct nfs_pathconf *pathconf)
3060 {
3061         struct nfs4_exception exception = { };
3062         int err;
3063
3064         do {
3065                 err = nfs4_handle_exception(server,
3066                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3067                                 &exception);
3068         } while (exception.retry);
3069         return err;
3070 }
3071
3072 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3073 {
3074         struct nfs_server *server = NFS_SERVER(data->inode);
3075
3076         dprintk("--> %s\n", __func__);
3077
3078         if (!nfs4_sequence_done(task, &data->res.seq_res))
3079                 return -EAGAIN;
3080
3081         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3082                 nfs_restart_rpc(task, server->nfs_client);
3083                 return -EAGAIN;
3084         }
3085
3086         nfs_invalidate_atime(data->inode);
3087         if (task->tk_status > 0)
3088                 renew_lease(server, data->timestamp);
3089         return 0;
3090 }
3091
3092 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3093 {
3094         data->timestamp   = jiffies;
3095         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3096 }
3097
3098 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3099 {
3100         struct inode *inode = data->inode;
3101
3102         if (!nfs4_sequence_done(task, &data->res.seq_res))
3103                 return -EAGAIN;
3104
3105         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3106                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3107                 return -EAGAIN;
3108         }
3109         if (task->tk_status >= 0) {
3110                 renew_lease(NFS_SERVER(inode), data->timestamp);
3111                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3112         }
3113         return 0;
3114 }
3115
3116 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3117 {
3118         struct nfs_server *server = NFS_SERVER(data->inode);
3119
3120         data->args.bitmask = server->cache_consistency_bitmask;
3121         data->res.server = server;
3122         data->timestamp   = jiffies;
3123
3124         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3125 }
3126
3127 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3128 {
3129         struct inode *inode = data->inode;
3130
3131         if (!nfs4_sequence_done(task, &data->res.seq_res))
3132                 return -EAGAIN;
3133
3134         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3135                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3136                 return -EAGAIN;
3137         }
3138         nfs_refresh_inode(inode, data->res.fattr);
3139         return 0;
3140 }
3141
3142 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3143 {
3144         struct nfs_server *server = NFS_SERVER(data->inode);
3145
3146         data->args.bitmask = server->cache_consistency_bitmask;
3147         data->res.server = server;
3148         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3149 }
3150
3151 struct nfs4_renewdata {
3152         struct nfs_client       *client;
3153         unsigned long           timestamp;
3154 };
3155
3156 /*
3157  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3158  * standalone procedure for queueing an asynchronous RENEW.
3159  */
3160 static void nfs4_renew_release(void *calldata)
3161 {
3162         struct nfs4_renewdata *data = calldata;
3163         struct nfs_client *clp = data->client;
3164
3165         if (atomic_read(&clp->cl_count) > 1)
3166                 nfs4_schedule_state_renewal(clp);
3167         nfs_put_client(clp);
3168         kfree(data);
3169 }
3170
3171 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3172 {
3173         struct nfs4_renewdata *data = calldata;
3174         struct nfs_client *clp = data->client;
3175         unsigned long timestamp = data->timestamp;
3176
3177         if (task->tk_status < 0) {
3178                 /* Unless we're shutting down, schedule state recovery! */
3179                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3180                         nfs4_schedule_lease_recovery(clp);
3181                 return;
3182         }
3183         do_renew_lease(clp, timestamp);
3184 }
3185
3186 static const struct rpc_call_ops nfs4_renew_ops = {
3187         .rpc_call_done = nfs4_renew_done,
3188         .rpc_release = nfs4_renew_release,
3189 };
3190
3191 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3192 {
3193         struct rpc_message msg = {
3194                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3195                 .rpc_argp       = clp,
3196                 .rpc_cred       = cred,
3197         };
3198         struct nfs4_renewdata *data;
3199
3200         if (!atomic_inc_not_zero(&clp->cl_count))
3201                 return -EIO;
3202         data = kmalloc(sizeof(*data), GFP_KERNEL);
3203         if (data == NULL)
3204                 return -ENOMEM;
3205         data->client = clp;
3206         data->timestamp = jiffies;
3207         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3208                         &nfs4_renew_ops, data);
3209 }
3210
3211 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3212 {
3213         struct rpc_message msg = {
3214                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3215                 .rpc_argp       = clp,
3216                 .rpc_cred       = cred,
3217         };
3218         unsigned long now = jiffies;
3219         int status;
3220
3221         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3222         if (status < 0)
3223                 return status;
3224         do_renew_lease(clp, now);
3225         return 0;
3226 }
3227
3228 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3229 {
3230         return (server->caps & NFS_CAP_ACLS)
3231                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3232                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3233 }
3234
3235 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3236  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3237  * the stack.
3238  */
3239 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3240
3241 static void buf_to_pages(const void *buf, size_t buflen,
3242                 struct page **pages, unsigned int *pgbase)
3243 {
3244         const void *p = buf;
3245
3246         *pgbase = offset_in_page(buf);
3247         p -= *pgbase;
3248         while (p < buf + buflen) {
3249                 *(pages++) = virt_to_page(p);
3250                 p += PAGE_CACHE_SIZE;
3251         }
3252 }
3253
3254 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3255                 struct page **pages, unsigned int *pgbase)
3256 {
3257         struct page *newpage, **spages;
3258         int rc = 0;
3259         size_t len;
3260         spages = pages;
3261
3262         do {
3263                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3264                 newpage = alloc_page(GFP_KERNEL);
3265
3266                 if (newpage == NULL)
3267                         goto unwind;
3268                 memcpy(page_address(newpage), buf, len);
3269                 buf += len;
3270                 buflen -= len;
3271                 *pages++ = newpage;
3272                 rc++;
3273         } while (buflen != 0);
3274
3275         return rc;
3276
3277 unwind:
3278         for(; rc > 0; rc--)
3279                 __free_page(spages[rc-1]);
3280         return -ENOMEM;
3281 }
3282
3283 struct nfs4_cached_acl {
3284         int cached;
3285         size_t len;
3286         char data[0];
3287 };
3288
3289 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3290 {
3291         struct nfs_inode *nfsi = NFS_I(inode);
3292
3293         spin_lock(&inode->i_lock);
3294         kfree(nfsi->nfs4_acl);
3295         nfsi->nfs4_acl = acl;
3296         spin_unlock(&inode->i_lock);
3297 }
3298
3299 static void nfs4_zap_acl_attr(struct inode *inode)
3300 {
3301         nfs4_set_cached_acl(inode, NULL);
3302 }
3303
3304 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3305 {
3306         struct nfs_inode *nfsi = NFS_I(inode);
3307         struct nfs4_cached_acl *acl;
3308         int ret = -ENOENT;
3309
3310         spin_lock(&inode->i_lock);
3311         acl = nfsi->nfs4_acl;
3312         if (acl == NULL)
3313                 goto out;
3314         if (buf == NULL) /* user is just asking for length */
3315                 goto out_len;
3316         if (acl->cached == 0)
3317                 goto out;
3318         ret = -ERANGE; /* see getxattr(2) man page */
3319         if (acl->len > buflen)
3320                 goto out;
3321         memcpy(buf, acl->data, acl->len);
3322 out_len:
3323         ret = acl->len;
3324 out:
3325         spin_unlock(&inode->i_lock);
3326         return ret;
3327 }
3328
3329 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3330 {
3331         struct nfs4_cached_acl *acl;
3332
3333         if (buf && acl_len <= PAGE_SIZE) {
3334                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3335                 if (acl == NULL)
3336                         goto out;
3337                 acl->cached = 1;
3338                 memcpy(acl->data, buf, acl_len);
3339         } else {
3340                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3341                 if (acl == NULL)
3342                         goto out;
3343                 acl->cached = 0;
3344         }
3345         acl->len = acl_len;
3346 out:
3347         nfs4_set_cached_acl(inode, acl);
3348 }
3349
3350 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3351 {
3352         struct page *pages[NFS4ACL_MAXPAGES];
3353         struct nfs_getaclargs args = {
3354                 .fh = NFS_FH(inode),
3355                 .acl_pages = pages,
3356                 .acl_len = buflen,
3357         };
3358         struct nfs_getaclres res = {
3359                 .acl_len = buflen,
3360         };
3361         void *resp_buf;
3362         struct rpc_message msg = {
3363                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3364                 .rpc_argp = &args,
3365                 .rpc_resp = &res,
3366         };
3367         struct page *localpage = NULL;
3368         int ret;
3369
3370         if (buflen < PAGE_SIZE) {
3371                 /* As long as we're doing a round trip to the server anyway,
3372                  * let's be prepared for a page of acl data. */
3373                 localpage = alloc_page(GFP_KERNEL);
3374                 resp_buf = page_address(localpage);
3375                 if (localpage == NULL)
3376                         return -ENOMEM;
3377                 args.acl_pages[0] = localpage;
3378                 args.acl_pgbase = 0;
3379                 args.acl_len = PAGE_SIZE;
3380         } else {
3381                 resp_buf = buf;
3382                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3383         }
3384         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3385         if (ret)
3386                 goto out_free;
3387         if (res.acl_len > args.acl_len)
3388                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3389         else
3390                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3391         if (buf) {
3392                 ret = -ERANGE;
3393                 if (res.acl_len > buflen)
3394                         goto out_free;
3395                 if (localpage)
3396                         memcpy(buf, resp_buf, res.acl_len);
3397         }
3398         ret = res.acl_len;
3399 out_free:
3400         if (localpage)
3401                 __free_page(localpage);
3402         return ret;
3403 }
3404
3405 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3406 {
3407         struct nfs4_exception exception = { };
3408         ssize_t ret;
3409         do {
3410                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3411                 if (ret >= 0)
3412                         break;
3413                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3414         } while (exception.retry);
3415         return ret;
3416 }
3417
3418 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3419 {
3420         struct nfs_server *server = NFS_SERVER(inode);
3421         int ret;
3422
3423         if (!nfs4_server_supports_acls(server))
3424                 return -EOPNOTSUPP;
3425         ret = nfs_revalidate_inode(server, inode);
3426         if (ret < 0)
3427                 return ret;
3428         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3429                 nfs_zap_acl_cache(inode);
3430         ret = nfs4_read_cached_acl(inode, buf, buflen);
3431         if (ret != -ENOENT)
3432                 return ret;
3433         return nfs4_get_acl_uncached(inode, buf, buflen);
3434 }
3435
3436 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3437 {
3438         struct nfs_server *server = NFS_SERVER(inode);
3439         struct page *pages[NFS4ACL_MAXPAGES];
3440         struct nfs_setaclargs arg = {
3441                 .fh             = NFS_FH(inode),
3442                 .acl_pages      = pages,
3443                 .acl_len        = buflen,
3444         };
3445         struct nfs_setaclres res;
3446         struct rpc_message msg = {
3447                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3448                 .rpc_argp       = &arg,
3449                 .rpc_resp       = &res,
3450         };
3451         int ret, i;
3452
3453         if (!nfs4_server_supports_acls(server))
3454                 return -EOPNOTSUPP;
3455         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3456         if (i < 0)
3457                 return i;
3458         nfs_inode_return_delegation(inode);
3459         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3460
3461         /*
3462          * Free each page after tx, so the only ref left is
3463          * held by the network stack
3464          */
3465         for (; i > 0; i--)
3466                 put_page(pages[i-1]);
3467
3468         /*
3469          * Acl update can result in inode attribute update.
3470          * so mark the attribute cache invalid.
3471          */
3472         spin_lock(&inode->i_lock);
3473         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3474         spin_unlock(&inode->i_lock);
3475         nfs_access_zap_cache(inode);
3476         nfs_zap_acl_cache(inode);
3477         return ret;
3478 }
3479
3480 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3481 {
3482         struct nfs4_exception exception = { };
3483         int err;
3484         do {
3485                 err = nfs4_handle_exception(NFS_SERVER(inode),
3486                                 __nfs4_proc_set_acl(inode, buf, buflen),
3487                                 &exception);
3488         } while (exception.retry);
3489         return err;
3490 }
3491
3492 static int
3493 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3494 {
3495         struct nfs_client *clp = server->nfs_client;
3496
3497         if (task->tk_status >= 0)
3498                 return 0;
3499         switch(task->tk_status) {
3500                 case -NFS4ERR_ADMIN_REVOKED:
3501                 case -NFS4ERR_BAD_STATEID:
3502                 case -NFS4ERR_OPENMODE:
3503                         if (state == NULL)
3504                                 break;
3505                         nfs4_schedule_stateid_recovery(server, state);
3506                         goto wait_on_recovery;
3507                 case -NFS4ERR_STALE_STATEID:
3508                 case -NFS4ERR_STALE_CLIENTID:
3509                 case -NFS4ERR_EXPIRED:
3510                         nfs4_schedule_lease_recovery(clp);
3511                         goto wait_on_recovery;
3512 #if defined(CONFIG_NFS_V4_1)
3513                 case -NFS4ERR_BADSESSION:
3514                 case -NFS4ERR_BADSLOT:
3515                 case -NFS4ERR_BAD_HIGH_SLOT:
3516                 case -NFS4ERR_DEADSESSION:
3517                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3518                 case -NFS4ERR_SEQ_FALSE_RETRY:
3519                 case -NFS4ERR_SEQ_MISORDERED:
3520                         dprintk("%s ERROR %d, Reset session\n", __func__,
3521                                 task->tk_status);
3522                         nfs4_schedule_session_recovery(clp->cl_session);
3523                         task->tk_status = 0;
3524                         return -EAGAIN;
3525 #endif /* CONFIG_NFS_V4_1 */
3526                 case -NFS4ERR_DELAY:
3527                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3528                 case -NFS4ERR_GRACE:
3529                 case -EKEYEXPIRED:
3530                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3531                         task->tk_status = 0;
3532                         return -EAGAIN;
3533                 case -NFS4ERR_OLD_STATEID:
3534                         task->tk_status = 0;
3535                         return -EAGAIN;
3536         }
3537         task->tk_status = nfs4_map_errors(task->tk_status);
3538         return 0;
3539 wait_on_recovery:
3540         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3541         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3542                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3543         task->tk_status = 0;
3544         return -EAGAIN;
3545 }
3546
3547 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
3548                 unsigned short port, struct rpc_cred *cred,
3549                 struct nfs4_setclientid_res *res)
3550 {
3551         nfs4_verifier sc_verifier;
3552         struct nfs4_setclientid setclientid = {
3553                 .sc_verifier = &sc_verifier,
3554                 .sc_prog = program,
3555                 .sc_cb_ident = clp->cl_cb_ident,
3556         };
3557         struct rpc_message msg = {
3558                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3559                 .rpc_argp = &setclientid,
3560                 .rpc_resp = res,
3561                 .rpc_cred = cred,
3562         };
3563         __be32 *p;
3564         int loop = 0;
3565         int status;
3566
3567         p = (__be32*)sc_verifier.data;
3568         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3569         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3570
3571         for(;;) {
3572                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3573                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3574                                 clp->cl_ipaddr,
3575                                 rpc_peeraddr2str(clp->cl_rpcclient,
3576                                                         RPC_DISPLAY_ADDR),
3577                                 rpc_peeraddr2str(clp->cl_rpcclient,
3578                                                         RPC_DISPLAY_PROTO),
3579                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3580                                 clp->cl_id_uniquifier);
3581                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3582                                 sizeof(setclientid.sc_netid),
3583                                 rpc_peeraddr2str(clp->cl_rpcclient,
3584                                                         RPC_DISPLAY_NETID));
3585                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3586                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3587                                 clp->cl_ipaddr, port >> 8, port & 255);
3588
3589                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3590                 if (status != -NFS4ERR_CLID_INUSE)
3591                         break;
3592                 if (signalled())
3593                         break;
3594                 if (loop++ & 1)
3595                         ssleep(clp->cl_lease_time / HZ + 1);
3596                 else
3597                         if (++clp->cl_id_uniquifier == 0)
3598                                 break;
3599         }
3600         return status;
3601 }
3602
3603 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3604                 struct nfs4_setclientid_res *arg,
3605                 struct rpc_cred *cred)
3606 {
3607         struct nfs_fsinfo fsinfo;
3608         struct rpc_message msg = {
3609                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3610                 .rpc_argp = arg,
3611                 .rpc_resp = &fsinfo,
3612                 .rpc_cred = cred,
3613         };
3614         unsigned long now;
3615         int status;
3616
3617         now = jiffies;
3618         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3619         if (status == 0) {
3620                 spin_lock(&clp->cl_lock);
3621                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3622                 clp->cl_last_renewal = now;
3623                 spin_unlock(&clp->cl_lock);
3624         }
3625         return status;
3626 }
3627
3628 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3629                 struct nfs4_setclientid_res *arg,
3630                 struct rpc_cred *cred)
3631 {
3632         long timeout = 0;
3633         int err;
3634         do {
3635                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3636                 switch (err) {
3637                         case 0:
3638                                 return err;
3639                         case -NFS4ERR_RESOURCE:
3640                                 /* The IBM lawyers misread another document! */
3641                         case -NFS4ERR_DELAY:
3642                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3643                 }
3644         } while (err == 0);
3645         return err;
3646 }
3647
3648 struct nfs4_delegreturndata {
3649         struct nfs4_delegreturnargs args;
3650         struct nfs4_delegreturnres res;
3651         struct nfs_fh fh;
3652         nfs4_stateid stateid;
3653         unsigned long timestamp;
3654         struct nfs_fattr fattr;
3655         int rpc_status;
3656 };
3657
3658 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3659 {
3660         struct nfs4_delegreturndata *data = calldata;
3661
3662         if (!nfs4_sequence_done(task, &data->res.seq_res))
3663                 return;
3664
3665         switch (task->tk_status) {
3666         case -NFS4ERR_STALE_STATEID:
3667         case -NFS4ERR_EXPIRED:
3668         case 0:
3669                 renew_lease(data->res.server, data->timestamp);
3670                 break;
3671         default:
3672                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3673                                 -EAGAIN) {
3674                         nfs_restart_rpc(task, data->res.server->nfs_client);
3675                         return;
3676                 }
3677         }
3678         data->rpc_status = task->tk_status;
3679 }
3680
3681 static void nfs4_delegreturn_release(void *calldata)
3682 {
3683         kfree(calldata);
3684 }
3685
3686 #if defined(CONFIG_NFS_V4_1)
3687 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3688 {
3689         struct nfs4_delegreturndata *d_data;
3690
3691         d_data = (struct nfs4_delegreturndata *)data;
3692
3693         if (nfs4_setup_sequence(d_data->res.server,
3694                                 &d_data->args.seq_args,
3695                                 &d_data->res.seq_res, 1, task))
3696                 return;
3697         rpc_call_start(task);
3698 }
3699 #endif /* CONFIG_NFS_V4_1 */
3700
3701 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3702 #if defined(CONFIG_NFS_V4_1)
3703         .rpc_call_prepare = nfs4_delegreturn_prepare,
3704 #endif /* CONFIG_NFS_V4_1 */
3705         .rpc_call_done = nfs4_delegreturn_done,
3706         .rpc_release = nfs4_delegreturn_release,
3707 };
3708
3709 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3710 {
3711         struct nfs4_delegreturndata *data;
3712         struct nfs_server *server = NFS_SERVER(inode);
3713         struct rpc_task *task;
3714         struct rpc_message msg = {
3715                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3716                 .rpc_cred = cred,
3717         };
3718         struct rpc_task_setup task_setup_data = {
3719                 .rpc_client = server->client,
3720                 .rpc_message = &msg,
3721                 .callback_ops = &nfs4_delegreturn_ops,
3722                 .flags = RPC_TASK_ASYNC,
3723         };
3724         int status = 0;
3725
3726         data = kzalloc(sizeof(*data), GFP_NOFS);
3727         if (data == NULL)
3728                 return -ENOMEM;
3729         data->args.fhandle = &data->fh;
3730         data->args.stateid = &data->stateid;
3731         data->args.bitmask = server->attr_bitmask;
3732         nfs_copy_fh(&data->fh, NFS_FH(inode));
3733         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3734         data->res.fattr = &data->fattr;
3735         data->res.server = server;
3736         nfs_fattr_init(data->res.fattr);
3737         data->timestamp = jiffies;
3738         data->rpc_status = 0;
3739
3740         task_setup_data.callback_data = data;
3741         msg.rpc_argp = &data->args;
3742         msg.rpc_resp = &data->res;
3743         task = rpc_run_task(&task_setup_data);
3744         if (IS_ERR(task))
3745                 return PTR_ERR(task);
3746         if (!issync)
3747                 goto out;
3748         status = nfs4_wait_for_completion_rpc_task(task);
3749         if (status != 0)
3750                 goto out;
3751         status = data->rpc_status;
3752         if (status != 0)
3753                 goto out;
3754         nfs_refresh_inode(inode, &data->fattr);
3755 out:
3756         rpc_put_task(task);
3757         return status;
3758 }
3759
3760 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3761 {
3762         struct nfs_server *server = NFS_SERVER(inode);
3763         struct nfs4_exception exception = { };
3764         int err;
3765         do {
3766                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3767                 switch (err) {
3768                         case -NFS4ERR_STALE_STATEID:
3769                         case -NFS4ERR_EXPIRED:
3770                         case 0:
3771                                 return 0;
3772                 }
3773                 err = nfs4_handle_exception(server, err, &exception);
3774         } while (exception.retry);
3775         return err;
3776 }
3777
3778 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3779 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3780
3781 /*
3782  * sleep, with exponential backoff, and retry the LOCK operation.
3783  */
3784 static unsigned long
3785 nfs4_set_lock_task_retry(unsigned long timeout)
3786 {
3787         schedule_timeout_killable(timeout);
3788         timeout <<= 1;
3789         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3790                 return NFS4_LOCK_MAXTIMEOUT;
3791         return timeout;
3792 }
3793
3794 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3795 {
3796         struct inode *inode = state->inode;
3797         struct nfs_server *server = NFS_SERVER(inode);
3798         struct nfs_client *clp = server->nfs_client;
3799         struct nfs_lockt_args arg = {
3800                 .fh = NFS_FH(inode),
3801                 .fl = request,
3802         };
3803         struct nfs_lockt_res res = {
3804                 .denied = request,
3805         };
3806         struct rpc_message msg = {
3807                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3808                 .rpc_argp       = &arg,
3809                 .rpc_resp       = &res,
3810                 .rpc_cred       = state->owner->so_cred,
3811         };
3812         struct nfs4_lock_state *lsp;
3813         int status;
3814
3815         arg.lock_owner.clientid = clp->cl_clientid;
3816         status = nfs4_set_lock_state(state, request);
3817         if (status != 0)
3818                 goto out;
3819         lsp = request->fl_u.nfs4_fl.owner;
3820         arg.lock_owner.id = lsp->ls_id.id;
3821         arg.lock_owner.s_dev = server->s_dev;
3822         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3823         switch (status) {
3824                 case 0:
3825                         request->fl_type = F_UNLCK;
3826                         break;
3827                 case -NFS4ERR_DENIED:
3828                         status = 0;
3829         }
3830         request->fl_ops->fl_release_private(request);
3831 out:
3832         return status;
3833 }
3834
3835 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3836 {
3837         struct nfs4_exception exception = { };
3838         int err;
3839
3840         do {
3841                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3842                                 _nfs4_proc_getlk(state, cmd, request),
3843                                 &exception);
3844         } while (exception.retry);
3845         return err;
3846 }
3847
3848 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3849 {
3850         int res = 0;
3851         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3852                 case FL_POSIX:
3853                         res = posix_lock_file_wait(file, fl);
3854                         break;
3855                 case FL_FLOCK:
3856                         res = flock_lock_file_wait(file, fl);
3857                         break;
3858                 default:
3859                         BUG();
3860         }
3861         return res;
3862 }
3863
3864 struct nfs4_unlockdata {
3865         struct nfs_locku_args arg;
3866         struct nfs_locku_res res;
3867         struct nfs4_lock_state *lsp;
3868         struct nfs_open_context *ctx;
3869         struct file_lock fl;
3870         const struct nfs_server *server;
3871         unsigned long timestamp;
3872 };
3873
3874 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3875                 struct nfs_open_context *ctx,
3876                 struct nfs4_lock_state *lsp,
3877                 struct nfs_seqid *seqid)
3878 {
3879         struct nfs4_unlockdata *p;
3880         struct inode *inode = lsp->ls_state->inode;
3881
3882         p = kzalloc(sizeof(*p), GFP_NOFS);
3883         if (p == NULL)
3884                 return NULL;
3885         p->arg.fh = NFS_FH(inode);
3886         p->arg.fl = &p->fl;
3887         p->arg.seqid = seqid;
3888         p->res.seqid = seqid;
3889         p->arg.stateid = &lsp->ls_stateid;
3890         p->lsp = lsp;
3891         atomic_inc(&lsp->ls_count);
3892         /* Ensure we don't close file until we're done freeing locks! */
3893         p->ctx = get_nfs_open_context(ctx);
3894         memcpy(&p->fl, fl, sizeof(p->fl));
3895         p->server = NFS_SERVER(inode);
3896         return p;
3897 }
3898
3899 static void nfs4_locku_release_calldata(void *data)
3900 {
3901         struct nfs4_unlockdata *calldata = data;
3902         nfs_free_seqid(calldata->arg.seqid);
3903         nfs4_put_lock_state(calldata->lsp);
3904         put_nfs_open_context(calldata->ctx);
3905         kfree(calldata);
3906 }
3907
3908 static void nfs4_locku_done(struct rpc_task *task, void *data)
3909 {
3910         struct nfs4_unlockdata *calldata = data;
3911
3912         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3913                 return;
3914         switch (task->tk_status) {
3915                 case 0:
3916                         memcpy(calldata->lsp->ls_stateid.data,
3917                                         calldata->res.stateid.data,
3918                                         sizeof(calldata->lsp->ls_stateid.data));
3919                         renew_lease(calldata->server, calldata->timestamp);
3920                         break;
3921                 case -NFS4ERR_BAD_STATEID:
3922                 case -NFS4ERR_OLD_STATEID:
3923                 case -NFS4ERR_STALE_STATEID:
3924                 case -NFS4ERR_EXPIRED:
3925                         break;
3926                 default:
3927                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3928                                 nfs_restart_rpc(task,
3929                                                  calldata->server->nfs_client);
3930         }
3931 }
3932
3933 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3934 {
3935         struct nfs4_unlockdata *calldata = data;
3936
3937         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3938                 return;
3939         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3940                 /* Note: exit _without_ running nfs4_locku_done */
3941                 task->tk_action = NULL;
3942                 return;
3943         }
3944         calldata->timestamp = jiffies;
3945         if (nfs4_setup_sequence(calldata->server,
3946                                 &calldata->arg.seq_args,
3947                                 &calldata->res.seq_res, 1, task))
3948                 return;
3949         rpc_call_start(task);
3950 }
3951
3952 static const struct rpc_call_ops nfs4_locku_ops = {
3953         .rpc_call_prepare = nfs4_locku_prepare,
3954         .rpc_call_done = nfs4_locku_done,
3955         .rpc_release = nfs4_locku_release_calldata,
3956 };
3957
3958 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3959                 struct nfs_open_context *ctx,
3960                 struct nfs4_lock_state *lsp,
3961                 struct nfs_seqid *seqid)
3962 {
3963         struct nfs4_unlockdata *data;
3964         struct rpc_message msg = {
3965                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3966                 .rpc_cred = ctx->cred,
3967         };
3968         struct rpc_task_setup task_setup_data = {
3969                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3970                 .rpc_message = &msg,
3971                 .callback_ops = &nfs4_locku_ops,
3972                 .workqueue = nfsiod_workqueue,
3973                 .flags = RPC_TASK_ASYNC,
3974         };
3975
3976         /* Ensure this is an unlock - when canceling a lock, the
3977          * canceled lock is passed in, and it won't be an unlock.
3978          */
3979         fl->fl_type = F_UNLCK;
3980
3981         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3982         if (data == NULL) {
3983                 nfs_free_seqid(seqid);
3984                 return ERR_PTR(-ENOMEM);
3985         }
3986
3987         msg.rpc_argp = &data->arg;
3988         msg.rpc_resp = &data->res;
3989         task_setup_data.callback_data = data;
3990         return rpc_run_task(&task_setup_data);
3991 }
3992
3993 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3994 {
3995         struct nfs_inode *nfsi = NFS_I(state->inode);
3996         struct nfs_seqid *seqid;
3997         struct nfs4_lock_state *lsp;
3998         struct rpc_task *task;
3999         int status = 0;
4000         unsigned char fl_flags = request->fl_flags;
4001
4002         status = nfs4_set_lock_state(state, request);
4003         /* Unlock _before_ we do the RPC call */
4004         request->fl_flags |= FL_EXISTS;
4005         down_read(&nfsi->rwsem);
4006         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4007                 up_read(&nfsi->rwsem);
4008                 goto out;
4009         }
4010         up_read(&nfsi->rwsem);
4011         if (status != 0)
4012                 goto out;
4013         /* Is this a delegated lock? */
4014         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4015                 goto out;
4016         lsp = request->fl_u.nfs4_fl.owner;
4017         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4018         status = -ENOMEM;
4019         if (seqid == NULL)
4020                 goto out;
4021         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4022         status = PTR_ERR(task);
4023         if (IS_ERR(task))
4024                 goto out;
4025         status = nfs4_wait_for_completion_rpc_task(task);
4026         rpc_put_task(task);
4027 out:
4028         request->fl_flags = fl_flags;
4029         return status;
4030 }
4031
4032 struct nfs4_lockdata {
4033         struct nfs_lock_args arg;
4034         struct nfs_lock_res res;
4035         struct nfs4_lock_state *lsp;
4036         struct nfs_open_context *ctx;
4037         struct file_lock fl;
4038         unsigned long timestamp;
4039         int rpc_status;
4040         int cancelled;
4041         struct nfs_server *server;
4042 };
4043
4044 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4045                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4046                 gfp_t gfp_mask)
4047 {
4048         struct nfs4_lockdata *p;
4049         struct inode *inode = lsp->ls_state->inode;
4050         struct nfs_server *server = NFS_SERVER(inode);
4051
4052         p = kzalloc(sizeof(*p), gfp_mask);
4053         if (p == NULL)
4054                 return NULL;
4055
4056         p->arg.fh = NFS_FH(inode);
4057         p->arg.fl = &p->fl;
4058         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4059         if (p->arg.open_seqid == NULL)
4060                 goto out_free;
4061         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4062         if (p->arg.lock_seqid == NULL)
4063                 goto out_free_seqid;
4064         p->arg.lock_stateid = &lsp->ls_stateid;
4065         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4066         p->arg.lock_owner.id = lsp->ls_id.id;
4067         p->arg.lock_owner.s_dev = server->s_dev;
4068         p->res.lock_seqid = p->arg.lock_seqid;
4069         p->lsp = lsp;
4070         p->server = server;
4071         atomic_inc(&lsp->ls_count);
4072         p->ctx = get_nfs_open_context(ctx);
4073         memcpy(&p->fl, fl, sizeof(p->fl));
4074         return p;
4075 out_free_seqid:
4076         nfs_free_seqid(p->arg.open_seqid);
4077 out_free:
4078         kfree(p);
4079         return NULL;
4080 }
4081
4082 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4083 {
4084         struct nfs4_lockdata *data = calldata;
4085         struct nfs4_state *state = data->lsp->ls_state;
4086
4087         dprintk("%s: begin!\n", __func__);
4088         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4089                 return;
4090         /* Do we need to do an open_to_lock_owner? */
4091         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4092                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4093                         return;
4094                 data->arg.open_stateid = &state->stateid;
4095                 data->arg.new_lock_owner = 1;
4096                 data->res.open_seqid = data->arg.open_seqid;
4097         } else
4098                 data->arg.new_lock_owner = 0;
4099         data->timestamp = jiffies;
4100         if (nfs4_setup_sequence(data->server,
4101                                 &data->arg.seq_args,
4102                                 &data->res.seq_res, 1, task))
4103                 return;
4104         rpc_call_start(task);
4105         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4106 }
4107
4108 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4109 {
4110         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4111         nfs4_lock_prepare(task, calldata);
4112 }
4113
4114 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4115 {
4116         struct nfs4_lockdata *data = calldata;
4117
4118         dprintk("%s: begin!\n", __func__);
4119
4120         if (!nfs4_sequence_done(task, &data->res.seq_res))
4121                 return;
4122
4123         data->rpc_status = task->tk_status;
4124         if (data->arg.new_lock_owner != 0) {
4125                 if (data->rpc_status == 0)
4126                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4127                 else
4128                         goto out;
4129         }
4130         if (data->rpc_status == 0) {
4131                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4132                                         sizeof(data->lsp->ls_stateid.data));
4133                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4134                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4135         }
4136 out:
4137         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4138 }
4139
4140 static void nfs4_lock_release(void *calldata)
4141 {
4142         struct nfs4_lockdata *data = calldata;
4143
4144         dprintk("%s: begin!\n", __func__);
4145         nfs_free_seqid(data->arg.open_seqid);
4146         if (data->cancelled != 0) {
4147                 struct rpc_task *task;
4148                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4149                                 data->arg.lock_seqid);
4150                 if (!IS_ERR(task))
4151                         rpc_put_task_async(task);
4152                 dprintk("%s: cancelling lock!\n", __func__);
4153         } else
4154                 nfs_free_seqid(data->arg.lock_seqid);
4155         nfs4_put_lock_state(data->lsp);
4156         put_nfs_open_context(data->ctx);
4157         kfree(data);
4158         dprintk("%s: done!\n", __func__);
4159 }
4160
4161 static const struct rpc_call_ops nfs4_lock_ops = {
4162         .rpc_call_prepare = nfs4_lock_prepare,
4163         .rpc_call_done = nfs4_lock_done,
4164         .rpc_release = nfs4_lock_release,
4165 };
4166
4167 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4168         .rpc_call_prepare = nfs4_recover_lock_prepare,
4169         .rpc_call_done = nfs4_lock_done,
4170         .rpc_release = nfs4_lock_release,
4171 };
4172
4173 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4174 {
4175         switch (error) {
4176         case -NFS4ERR_ADMIN_REVOKED:
4177         case -NFS4ERR_BAD_STATEID:
4178                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4179                 if (new_lock_owner != 0 ||
4180                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4181                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4182                 break;
4183         case -NFS4ERR_STALE_STATEID:
4184                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4185         case -NFS4ERR_EXPIRED:
4186                 nfs4_schedule_lease_recovery(server->nfs_client);
4187         };
4188 }
4189
4190 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4191 {
4192         struct nfs4_lockdata *data;
4193         struct rpc_task *task;
4194         struct rpc_message msg = {
4195                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4196                 .rpc_cred = state->owner->so_cred,
4197         };
4198         struct rpc_task_setup task_setup_data = {
4199                 .rpc_client = NFS_CLIENT(state->inode),
4200                 .rpc_message = &msg,
4201                 .callback_ops = &nfs4_lock_ops,
4202                 .workqueue = nfsiod_workqueue,
4203                 .flags = RPC_TASK_ASYNC,
4204         };
4205         int ret;
4206
4207         dprintk("%s: begin!\n", __func__);
4208         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4209                         fl->fl_u.nfs4_fl.owner,
4210                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4211         if (data == NULL)
4212                 return -ENOMEM;
4213         if (IS_SETLKW(cmd))
4214                 data->arg.block = 1;
4215         if (recovery_type > NFS_LOCK_NEW) {
4216                 if (recovery_type == NFS_LOCK_RECLAIM)
4217                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4218                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4219         }
4220         msg.rpc_argp = &data->arg;
4221         msg.rpc_resp = &data->res;
4222         task_setup_data.callback_data = data;
4223         task = rpc_run_task(&task_setup_data);
4224         if (IS_ERR(task))
4225                 return PTR_ERR(task);
4226         ret = nfs4_wait_for_completion_rpc_task(task);
4227         if (ret == 0) {
4228                 ret = data->rpc_status;
4229                 if (ret)
4230                         nfs4_handle_setlk_error(data->server, data->lsp,
4231                                         data->arg.new_lock_owner, ret);
4232         } else
4233                 data->cancelled = 1;
4234         rpc_put_task(task);
4235         dprintk("%s: done, ret = %d!\n", __func__, ret);
4236         return ret;
4237 }
4238
4239 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4240 {
4241         struct nfs_server *server = NFS_SERVER(state->inode);
4242         struct nfs4_exception exception = { };
4243         int err;
4244
4245         do {
4246                 /* Cache the lock if possible... */
4247                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4248                         return 0;
4249                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4250                 if (err != -NFS4ERR_DELAY)
4251                         break;
4252                 nfs4_handle_exception(server, err, &exception);
4253         } while (exception.retry);
4254         return err;
4255 }
4256
4257 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4258 {
4259         struct nfs_server *server = NFS_SERVER(state->inode);
4260         struct nfs4_exception exception = { };
4261         int err;
4262
4263         err = nfs4_set_lock_state(state, request);
4264         if (err != 0)
4265                 return err;
4266         do {
4267                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4268                         return 0;
4269                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4270                 switch (err) {
4271                 default:
4272                         goto out;
4273                 case -NFS4ERR_GRACE:
4274                 case -NFS4ERR_DELAY:
4275                         nfs4_handle_exception(server, err, &exception);
4276                         err = 0;
4277                 }
4278         } while (exception.retry);
4279 out:
4280         return err;
4281 }
4282
4283 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4284 {
4285         struct nfs_inode *nfsi = NFS_I(state->inode);
4286         unsigned char fl_flags = request->fl_flags;
4287         int status = -ENOLCK;
4288
4289         if ((fl_flags & FL_POSIX) &&
4290                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4291                 goto out;
4292         /* Is this a delegated open? */
4293         status = nfs4_set_lock_state(state, request);
4294         if (status != 0)
4295                 goto out;
4296         request->fl_flags |= FL_ACCESS;
4297         status = do_vfs_lock(request->fl_file, request);
4298         if (status < 0)
4299                 goto out;
4300         down_read(&nfsi->rwsem);
4301         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4302                 /* Yes: cache locks! */
4303                 /* ...but avoid races with delegation recall... */
4304                 request->fl_flags = fl_flags & ~FL_SLEEP;
4305                 status = do_vfs_lock(request->fl_file, request);
4306                 goto out_unlock;
4307         }
4308         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4309         if (status != 0)
4310                 goto out_unlock;
4311         /* Note: we always want to sleep here! */
4312         request->fl_flags = fl_flags | FL_SLEEP;
4313         if (do_vfs_lock(request->fl_file, request) < 0)
4314                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4315 out_unlock:
4316         up_read(&nfsi->rwsem);
4317 out:
4318         request->fl_flags = fl_flags;
4319         return status;
4320 }
4321
4322 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4323 {
4324         struct nfs4_exception exception = { };
4325         int err;
4326
4327         do {
4328                 err = _nfs4_proc_setlk(state, cmd, request);
4329                 if (err == -NFS4ERR_DENIED)
4330                         err = -EAGAIN;
4331                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4332                                 err, &exception);
4333         } while (exception.retry);
4334         return err;
4335 }
4336
4337 static int
4338 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4339 {
4340         struct nfs_open_context *ctx;
4341         struct nfs4_state *state;
4342         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4343         int status;
4344
4345         /* verify open state */
4346         ctx = nfs_file_open_context(filp);
4347         state = ctx->state;
4348
4349         if (request->fl_start < 0 || request->fl_end < 0)
4350                 return -EINVAL;
4351
4352         if (IS_GETLK(cmd)) {
4353                 if (state != NULL)
4354                         return nfs4_proc_getlk(state, F_GETLK, request);
4355                 return 0;
4356         }
4357
4358         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4359                 return -EINVAL;
4360
4361         if (request->fl_type == F_UNLCK) {
4362                 if (state != NULL)
4363                         return nfs4_proc_unlck(state, cmd, request);
4364                 return 0;
4365         }
4366
4367         if (state == NULL)
4368                 return -ENOLCK;
4369         do {
4370                 status = nfs4_proc_setlk(state, cmd, request);
4371                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4372                         break;
4373                 timeout = nfs4_set_lock_task_retry(timeout);
4374                 status = -ERESTARTSYS;
4375                 if (signalled())
4376                         break;
4377         } while(status < 0);
4378         return status;
4379 }
4380
4381 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4382 {
4383         struct nfs_server *server = NFS_SERVER(state->inode);
4384         struct nfs4_exception exception = { };
4385         int err;
4386
4387         err = nfs4_set_lock_state(state, fl);
4388         if (err != 0)
4389                 goto out;
4390         do {
4391                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4392                 switch (err) {
4393                         default:
4394                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4395                                                 __func__, err);
4396                         case 0:
4397                         case -ESTALE:
4398                                 goto out;
4399                         case -NFS4ERR_EXPIRED:
4400                         case -NFS4ERR_STALE_CLIENTID:
4401                         case -NFS4ERR_STALE_STATEID:
4402                                 nfs4_schedule_lease_recovery(server->nfs_client);
4403                                 goto out;
4404                         case -NFS4ERR_BADSESSION:
4405                         case -NFS4ERR_BADSLOT:
4406                         case -NFS4ERR_BAD_HIGH_SLOT:
4407                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4408                         case -NFS4ERR_DEADSESSION:
4409                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session);
4410                                 goto out;
4411                         case -ERESTARTSYS:
4412                                 /*
4413                                  * The show must go on: exit, but mark the
4414                                  * stateid as needing recovery.
4415                                  */
4416                         case -NFS4ERR_ADMIN_REVOKED:
4417                         case -NFS4ERR_BAD_STATEID:
4418                         case -NFS4ERR_OPENMODE:
4419                                 nfs4_schedule_stateid_recovery(server, state);
4420                                 err = 0;
4421                                 goto out;
4422                         case -EKEYEXPIRED:
4423                                 /*
4424                                  * User RPCSEC_GSS context has expired.
4425                                  * We cannot recover this stateid now, so
4426                                  * skip it and allow recovery thread to
4427                                  * proceed.
4428                                  */
4429                                 err = 0;
4430                                 goto out;
4431                         case -ENOMEM:
4432                         case -NFS4ERR_DENIED:
4433                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4434                                 err = 0;
4435                                 goto out;
4436                         case -NFS4ERR_DELAY:
4437                                 break;
4438                 }
4439                 err = nfs4_handle_exception(server, err, &exception);
4440         } while (exception.retry);
4441 out:
4442         return err;
4443 }
4444
4445 static void nfs4_release_lockowner_release(void *calldata)
4446 {
4447         kfree(calldata);
4448 }
4449
4450 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4451         .rpc_release = nfs4_release_lockowner_release,
4452 };
4453
4454 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4455 {
4456         struct nfs_server *server = lsp->ls_state->owner->so_server;
4457         struct nfs_release_lockowner_args *args;
4458         struct rpc_message msg = {
4459                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4460         };
4461
4462         if (server->nfs_client->cl_mvops->minor_version != 0)
4463                 return;
4464         args = kmalloc(sizeof(*args), GFP_NOFS);
4465         if (!args)
4466                 return;
4467         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4468         args->lock_owner.id = lsp->ls_id.id;
4469         args->lock_owner.s_dev = server->s_dev;
4470         msg.rpc_argp = args;
4471         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, args);
4472 }
4473
4474 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4475
4476 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
4477                                    const void *buf, size_t buflen,
4478                                    int flags, int type)
4479 {
4480         if (strcmp(key, "") != 0)
4481                 return -EINVAL;
4482
4483         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
4484 }
4485
4486 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
4487                                    void *buf, size_t buflen, int type)
4488 {
4489         if (strcmp(key, "") != 0)
4490                 return -EINVAL;
4491
4492         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
4493 }
4494
4495 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
4496                                        size_t list_len, const char *name,
4497                                        size_t name_len, int type)
4498 {
4499         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
4500
4501         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4502                 return 0;
4503
4504         if (list && len <= list_len)
4505                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
4506         return len;
4507 }
4508
4509 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4510 {
4511         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4512                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4513                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4514                 return;
4515
4516         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4517                 NFS_ATTR_FATTR_NLINK;
4518         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4519         fattr->nlink = 2;
4520 }
4521
4522 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4523                 struct nfs4_fs_locations *fs_locations, struct page *page)
4524 {
4525         struct nfs_server *server = NFS_SERVER(dir);
4526         u32 bitmask[2] = {
4527                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4528                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4529         };
4530         struct nfs4_fs_locations_arg args = {
4531                 .dir_fh = NFS_FH(dir),
4532                 .name = name,
4533                 .page = page,
4534                 .bitmask = bitmask,
4535         };
4536         struct nfs4_fs_locations_res res = {
4537                 .fs_locations = fs_locations,
4538         };
4539         struct rpc_message msg = {
4540                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4541                 .rpc_argp = &args,
4542                 .rpc_resp = &res,
4543         };
4544         int status;
4545
4546         dprintk("%s: start\n", __func__);
4547         nfs_fattr_init(&fs_locations->fattr);
4548         fs_locations->server = server;
4549         fs_locations->nlocations = 0;
4550         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4551         nfs_fixup_referral_attributes(&fs_locations->fattr);
4552         dprintk("%s: returned status = %d\n", __func__, status);
4553         return status;
4554 }
4555
4556 #ifdef CONFIG_NFS_V4_1
4557 /*
4558  * Check the exchange flags returned by the server for invalid flags, having
4559  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
4560  * DS flags set.
4561  */
4562 static int nfs4_check_cl_exchange_flags(u32 flags)
4563 {
4564         if (flags & ~EXCHGID4_FLAG_MASK_R)
4565                 goto out_inval;
4566         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
4567             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
4568                 goto out_inval;
4569         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
4570                 goto out_inval;
4571         return NFS_OK;
4572 out_inval:
4573         return -NFS4ERR_INVAL;
4574 }
4575
4576 /*
4577  * nfs4_proc_exchange_id()
4578  *
4579  * Since the clientid has expired, all compounds using sessions
4580  * associated with the stale clientid will be returning
4581  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4582  * be in some phase of session reset.
4583  */
4584 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4585 {
4586         nfs4_verifier verifier;
4587         struct nfs41_exchange_id_args args = {
4588                 .client = clp,
4589                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
4590         };
4591         struct nfs41_exchange_id_res res = {
4592                 .client = clp,
4593         };
4594         int status;
4595         struct rpc_message msg = {
4596                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4597                 .rpc_argp = &args,
4598                 .rpc_resp = &res,
4599                 .rpc_cred = cred,
4600         };
4601         __be32 *p;
4602
4603         dprintk("--> %s\n", __func__);
4604         BUG_ON(clp == NULL);
4605
4606         p = (u32 *)verifier.data;
4607         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4608         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4609         args.verifier = &verifier;
4610
4611         args.id_len = scnprintf(args.id, sizeof(args.id),
4612                                 "%s/%s.%s/%u",
4613                                 clp->cl_ipaddr,
4614                                 init_utsname()->nodename,
4615                                 init_utsname()->domainname,
4616                                 clp->cl_rpcclient->cl_auth->au_flavor);
4617
4618         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4619         if (!status)
4620                 status = nfs4_check_cl_exchange_flags(clp->cl_exchange_flags);
4621         dprintk("<-- %s status= %d\n", __func__, status);
4622         return status;
4623 }
4624
4625 struct nfs4_get_lease_time_data {
4626         struct nfs4_get_lease_time_args *args;
4627         struct nfs4_get_lease_time_res *res;
4628         struct nfs_client *clp;
4629 };
4630
4631 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4632                                         void *calldata)
4633 {
4634         int ret;
4635         struct nfs4_get_lease_time_data *data =
4636                         (struct nfs4_get_lease_time_data *)calldata;
4637
4638         dprintk("--> %s\n", __func__);
4639         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4640         /* just setup sequence, do not trigger session recovery
4641            since we're invoked within one */
4642         ret = nfs41_setup_sequence(data->clp->cl_session,
4643                                    &data->args->la_seq_args,
4644                                    &data->res->lr_seq_res, 0, task);
4645
4646         BUG_ON(ret == -EAGAIN);
4647         rpc_call_start(task);
4648         dprintk("<-- %s\n", __func__);
4649 }
4650
4651 /*
4652  * Called from nfs4_state_manager thread for session setup, so don't recover
4653  * from sequence operation or clientid errors.
4654  */
4655 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4656 {
4657         struct nfs4_get_lease_time_data *data =
4658                         (struct nfs4_get_lease_time_data *)calldata;
4659
4660         dprintk("--> %s\n", __func__);
4661         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
4662                 return;
4663         switch (task->tk_status) {
4664         case -NFS4ERR_DELAY:
4665         case -NFS4ERR_GRACE:
4666                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4667                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4668                 task->tk_status = 0;
4669                 nfs_restart_rpc(task, data->clp);
4670                 return;
4671         }
4672         dprintk("<-- %s\n", __func__);
4673 }
4674
4675 struct rpc_call_ops nfs4_get_lease_time_ops = {
4676         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4677         .rpc_call_done = nfs4_get_lease_time_done,
4678 };
4679
4680 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4681 {
4682         struct rpc_task *task;
4683         struct nfs4_get_lease_time_args args;
4684         struct nfs4_get_lease_time_res res = {
4685                 .lr_fsinfo = fsinfo,
4686         };
4687         struct nfs4_get_lease_time_data data = {
4688                 .args = &args,
4689                 .res = &res,
4690                 .clp = clp,
4691         };
4692         struct rpc_message msg = {
4693                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4694                 .rpc_argp = &args,
4695                 .rpc_resp = &res,
4696         };
4697         struct rpc_task_setup task_setup = {
4698                 .rpc_client = clp->cl_rpcclient,
4699                 .rpc_message = &msg,
4700                 .callback_ops = &nfs4_get_lease_time_ops,
4701                 .callback_data = &data
4702         };
4703         int status;
4704
4705         dprintk("--> %s\n", __func__);
4706         task = rpc_run_task(&task_setup);
4707
4708         if (IS_ERR(task))
4709                 status = PTR_ERR(task);
4710         else {
4711                 status = task->tk_status;
4712                 rpc_put_task(task);
4713         }
4714         dprintk("<-- %s return %d\n", __func__, status);
4715
4716         return status;
4717 }
4718
4719 /*
4720  * Reset a slot table
4721  */
4722 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4723                                  int ivalue)
4724 {
4725         struct nfs4_slot *new = NULL;
4726         int i;
4727         int ret = 0;
4728
4729         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4730                 max_reqs, tbl->max_slots);
4731
4732         /* Does the newly negotiated max_reqs match the existing slot table? */
4733         if (max_reqs != tbl->max_slots) {
4734                 ret = -ENOMEM;
4735                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4736                               GFP_NOFS);
4737                 if (!new)
4738                         goto out;
4739                 ret = 0;
4740                 kfree(tbl->slots);
4741         }
4742         spin_lock(&tbl->slot_tbl_lock);
4743         if (new) {
4744                 tbl->slots = new;
4745                 tbl->max_slots = max_reqs;
4746         }
4747         for (i = 0; i < tbl->max_slots; ++i)
4748                 tbl->slots[i].seq_nr = ivalue;
4749         spin_unlock(&tbl->slot_tbl_lock);
4750         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4751                 tbl, tbl->slots, tbl->max_slots);
4752 out:
4753         dprintk("<-- %s: return %d\n", __func__, ret);
4754         return ret;
4755 }
4756
4757 /*
4758  * Reset the forechannel and backchannel slot tables
4759  */
4760 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4761 {
4762         int status;
4763
4764         status = nfs4_reset_slot_table(&session->fc_slot_table,
4765                         session->fc_attrs.max_reqs, 1);
4766         if (status)
4767                 return status;
4768
4769         status = nfs4_reset_slot_table(&session->bc_slot_table,
4770                         session->bc_attrs.max_reqs, 0);
4771         return status;
4772 }
4773
4774 /* Destroy the slot table */
4775 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4776 {
4777         if (session->fc_slot_table.slots != NULL) {
4778                 kfree(session->fc_slot_table.slots);
4779                 session->fc_slot_table.slots = NULL;
4780         }
4781         if (session->bc_slot_table.slots != NULL) {
4782                 kfree(session->bc_slot_table.slots);
4783                 session->bc_slot_table.slots = NULL;
4784         }
4785         return;
4786 }
4787
4788 /*
4789  * Initialize slot table
4790  */
4791 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4792                 int max_slots, int ivalue)
4793 {
4794         struct nfs4_slot *slot;
4795         int ret = -ENOMEM;
4796
4797         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4798
4799         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4800
4801         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4802         if (!slot)
4803                 goto out;
4804         ret = 0;
4805
4806         spin_lock(&tbl->slot_tbl_lock);
4807         tbl->max_slots = max_slots;
4808         tbl->slots = slot;
4809         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4810         spin_unlock(&tbl->slot_tbl_lock);
4811         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4812                 tbl, tbl->slots, tbl->max_slots);
4813 out:
4814         dprintk("<-- %s: return %d\n", __func__, ret);
4815         return ret;
4816 }
4817
4818 /*
4819  * Initialize the forechannel and backchannel tables
4820  */
4821 static int nfs4_init_slot_tables(struct nfs4_session *session)
4822 {
4823         struct nfs4_slot_table *tbl;
4824         int status = 0;
4825
4826         tbl = &session->fc_slot_table;
4827         if (tbl->slots == NULL) {
4828                 status = nfs4_init_slot_table(tbl,
4829                                 session->fc_attrs.max_reqs, 1);
4830                 if (status)
4831                         return status;
4832         }
4833
4834         tbl = &session->bc_slot_table;
4835         if (tbl->slots == NULL) {
4836                 status = nfs4_init_slot_table(tbl,
4837                                 session->bc_attrs.max_reqs, 0);
4838                 if (status)
4839                         nfs4_destroy_slot_tables(session);
4840         }
4841
4842         return status;
4843 }
4844
4845 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4846 {
4847         struct nfs4_session *session;
4848         struct nfs4_slot_table *tbl;
4849
4850         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4851         if (!session)
4852                 return NULL;
4853
4854         tbl = &session->fc_slot_table;
4855         tbl->highest_used_slotid = -1;
4856         spin_lock_init(&tbl->slot_tbl_lock);
4857         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4858         init_completion(&tbl->complete);
4859
4860         tbl = &session->bc_slot_table;
4861         tbl->highest_used_slotid = -1;
4862         spin_lock_init(&tbl->slot_tbl_lock);
4863         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4864         init_completion(&tbl->complete);
4865
4866         session->session_state = 1<<NFS4_SESSION_INITING;
4867
4868         session->clp = clp;
4869         return session;
4870 }
4871
4872 void nfs4_destroy_session(struct nfs4_session *session)
4873 {
4874         nfs4_proc_destroy_session(session);
4875         dprintk("%s Destroy backchannel for xprt %p\n",
4876                 __func__, session->clp->cl_rpcclient->cl_xprt);
4877         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4878                                 NFS41_BC_MIN_CALLBACKS);
4879         nfs4_destroy_slot_tables(session);
4880         kfree(session);
4881 }
4882
4883 /*
4884  * Initialize the values to be used by the client in CREATE_SESSION
4885  * If nfs4_init_session set the fore channel request and response sizes,
4886  * use them.
4887  *
4888  * Set the back channel max_resp_sz_cached to zero to force the client to
4889  * always set csa_cachethis to FALSE because the current implementation
4890  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4891  */
4892 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4893 {
4894         struct nfs4_session *session = args->client->cl_session;
4895         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4896                      mxresp_sz = session->fc_attrs.max_resp_sz;
4897
4898         if (mxrqst_sz == 0)
4899                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4900         if (mxresp_sz == 0)
4901                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4902         /* Fore channel attributes */
4903         args->fc_attrs.headerpadsz = 0;
4904         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4905         args->fc_attrs.max_resp_sz = mxresp_sz;
4906         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4907         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4908
4909         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4910                 "max_ops=%u max_reqs=%u\n",
4911                 __func__,
4912                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4913                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4914
4915         /* Back channel attributes */
4916         args->bc_attrs.headerpadsz = 0;
4917         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4918         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4919         args->bc_attrs.max_resp_sz_cached = 0;
4920         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4921         args->bc_attrs.max_reqs = 1;
4922
4923         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4924                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4925                 __func__,
4926                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4927                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4928                 args->bc_attrs.max_reqs);
4929 }
4930
4931 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4932 {
4933         struct nfs4_channel_attrs *sent = &args->fc_attrs;
4934         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
4935
4936         if (rcvd->headerpadsz > sent->headerpadsz)
4937                 return -EINVAL;
4938         if (rcvd->max_resp_sz > sent->max_resp_sz)
4939                 return -EINVAL;
4940         /*
4941          * Our requested max_ops is the minimum we need; we're not
4942          * prepared to break up compounds into smaller pieces than that.
4943          * So, no point even trying to continue if the server won't
4944          * cooperate:
4945          */
4946         if (rcvd->max_ops < sent->max_ops)
4947                 return -EINVAL;
4948         if (rcvd->max_reqs == 0)
4949                 return -EINVAL;
4950         return 0;
4951 }
4952
4953 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
4954 {
4955         struct nfs4_channel_attrs *sent = &args->bc_attrs;
4956         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
4957
4958         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
4959                 return -EINVAL;
4960         if (rcvd->max_resp_sz < sent->max_resp_sz)
4961                 return -EINVAL;
4962         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
4963                 return -EINVAL;
4964         /* These would render the backchannel useless: */
4965         if (rcvd->max_ops  == 0)
4966                 return -EINVAL;
4967         if (rcvd->max_reqs == 0)
4968                 return -EINVAL;
4969         return 0;
4970 }
4971
4972 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4973                                      struct nfs4_session *session)
4974 {
4975         int ret;
4976
4977         ret = nfs4_verify_fore_channel_attrs(args, session);
4978         if (ret)
4979                 return ret;
4980         return nfs4_verify_back_channel_attrs(args, session);
4981 }
4982
4983 static int _nfs4_proc_create_session(struct nfs_client *clp)
4984 {
4985         struct nfs4_session *session = clp->cl_session;
4986         struct nfs41_create_session_args args = {
4987                 .client = clp,
4988                 .cb_program = NFS4_CALLBACK,
4989         };
4990         struct nfs41_create_session_res res = {
4991                 .client = clp,
4992         };
4993         struct rpc_message msg = {
4994                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4995                 .rpc_argp = &args,
4996                 .rpc_resp = &res,
4997         };
4998         int status;
4999
5000         nfs4_init_channel_attrs(&args);
5001         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5002
5003         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5004
5005         if (!status)
5006                 /* Verify the session's negotiated channel_attrs values */
5007                 status = nfs4_verify_channel_attrs(&args, session);
5008         if (!status) {
5009                 /* Increment the clientid slot sequence id */
5010                 clp->cl_seqid++;
5011         }
5012
5013         return status;
5014 }
5015
5016 /*
5017  * Issues a CREATE_SESSION operation to the server.
5018  * It is the responsibility of the caller to verify the session is
5019  * expired before calling this routine.
5020  */
5021 int nfs4_proc_create_session(struct nfs_client *clp)
5022 {
5023         int status;
5024         unsigned *ptr;
5025         struct nfs4_session *session = clp->cl_session;
5026         long timeout = 0;
5027         int err;
5028
5029         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5030
5031         do {
5032                 status = _nfs4_proc_create_session(clp);
5033                 if (status == -NFS4ERR_DELAY) {
5034                         err = nfs4_delay(clp->cl_rpcclient, &timeout);
5035                         if (err)
5036                                 status = err;
5037                 }
5038         } while (status == -NFS4ERR_DELAY);
5039
5040         if (status)
5041                 goto out;
5042
5043         /* Init and reset the fore channel */
5044         status = nfs4_init_slot_tables(session);
5045         dprintk("slot table initialization returned %d\n", status);
5046         if (status)
5047                 goto out;
5048         status = nfs4_reset_slot_tables(session);
5049         dprintk("slot table reset returned %d\n", status);
5050         if (status)
5051                 goto out;
5052
5053         ptr = (unsigned *)&session->sess_id.data[0];
5054         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5055                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5056 out:
5057         dprintk("<-- %s\n", __func__);
5058         return status;
5059 }
5060
5061 /*
5062  * Issue the over-the-wire RPC DESTROY_SESSION.
5063  * The caller must serialize access to this routine.
5064  */
5065 int nfs4_proc_destroy_session(struct nfs4_session *session)
5066 {
5067         int status = 0;
5068         struct rpc_message msg;
5069
5070         dprintk("--> nfs4_proc_destroy_session\n");
5071
5072         /* session is still being setup */
5073         if (session->clp->cl_cons_state != NFS_CS_READY)
5074                 return status;
5075
5076         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5077         msg.rpc_argp = session;
5078         msg.rpc_resp = NULL;
5079         msg.rpc_cred = NULL;
5080         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5081
5082         if (status)
5083                 printk(KERN_WARNING
5084                         "Got error %d from the server on DESTROY_SESSION. "
5085                         "Session has been destroyed regardless...\n", status);
5086
5087         dprintk("<-- nfs4_proc_destroy_session\n");
5088         return status;
5089 }
5090
5091 int nfs4_init_session(struct nfs_server *server)
5092 {
5093         struct nfs_client *clp = server->nfs_client;
5094         struct nfs4_session *session;
5095         unsigned int rsize, wsize;
5096         int ret;
5097
5098         if (!nfs4_has_session(clp))
5099                 return 0;
5100
5101         session = clp->cl_session;
5102         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5103                 return 0;
5104
5105         rsize = server->rsize;
5106         if (rsize == 0)
5107                 rsize = NFS_MAX_FILE_IO_SIZE;
5108         wsize = server->wsize;
5109         if (wsize == 0)
5110                 wsize = NFS_MAX_FILE_IO_SIZE;
5111
5112         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5113         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5114
5115         ret = nfs4_recover_expired_lease(server);
5116         if (!ret)
5117                 ret = nfs4_check_client_ready(clp);
5118         return ret;
5119 }
5120
5121 /*
5122  * Renew the cl_session lease.
5123  */
5124 struct nfs4_sequence_data {
5125         struct nfs_client *clp;
5126         struct nfs4_sequence_args args;
5127         struct nfs4_sequence_res res;
5128 };
5129
5130 static void nfs41_sequence_release(void *data)
5131 {
5132         struct nfs4_sequence_data *calldata = data;
5133         struct nfs_client *clp = calldata->clp;
5134
5135         if (atomic_read(&clp->cl_count) > 1)
5136                 nfs4_schedule_state_renewal(clp);
5137         nfs_put_client(clp);
5138         kfree(calldata);
5139 }
5140
5141 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5142 {
5143         switch(task->tk_status) {
5144         case -NFS4ERR_DELAY:
5145                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5146                 return -EAGAIN;
5147         default:
5148                 nfs4_schedule_lease_recovery(clp);
5149         }
5150         return 0;
5151 }
5152
5153 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5154 {
5155         struct nfs4_sequence_data *calldata = data;
5156         struct nfs_client *clp = calldata->clp;
5157
5158         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5159                 return;
5160
5161         if (task->tk_status < 0) {
5162                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5163                 if (atomic_read(&clp->cl_count) == 1)
5164                         goto out;
5165
5166                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5167                         rpc_restart_call_prepare(task);
5168                         return;
5169                 }
5170         }
5171         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5172 out:
5173         dprintk("<-- %s\n", __func__);
5174 }
5175
5176 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5177 {
5178         struct nfs4_sequence_data *calldata = data;
5179         struct nfs_client *clp = calldata->clp;
5180         struct nfs4_sequence_args *args;
5181         struct nfs4_sequence_res *res;
5182
5183         args = task->tk_msg.rpc_argp;
5184         res = task->tk_msg.rpc_resp;
5185
5186         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5187                 return;
5188         rpc_call_start(task);
5189 }
5190
5191 static const struct rpc_call_ops nfs41_sequence_ops = {
5192         .rpc_call_done = nfs41_sequence_call_done,
5193         .rpc_call_prepare = nfs41_sequence_prepare,
5194         .rpc_release = nfs41_sequence_release,
5195 };
5196
5197 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5198 {
5199         struct nfs4_sequence_data *calldata;
5200         struct rpc_message msg = {
5201                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5202                 .rpc_cred = cred,
5203         };
5204         struct rpc_task_setup task_setup_data = {
5205                 .rpc_client = clp->cl_rpcclient,
5206                 .rpc_message = &msg,
5207                 .callback_ops = &nfs41_sequence_ops,
5208                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5209         };
5210
5211         if (!atomic_inc_not_zero(&clp->cl_count))
5212                 return ERR_PTR(-EIO);
5213         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5214         if (calldata == NULL) {
5215                 nfs_put_client(clp);
5216                 return ERR_PTR(-ENOMEM);
5217         }
5218         msg.rpc_argp = &calldata->args;
5219         msg.rpc_resp = &calldata->res;
5220         calldata->clp = clp;
5221         task_setup_data.callback_data = calldata;
5222
5223         return rpc_run_task(&task_setup_data);
5224 }
5225
5226 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5227 {
5228         struct rpc_task *task;
5229         int ret = 0;
5230
5231         task = _nfs41_proc_sequence(clp, cred);
5232         if (IS_ERR(task))
5233                 ret = PTR_ERR(task);
5234         else
5235                 rpc_put_task_async(task);
5236         dprintk("<-- %s status=%d\n", __func__, ret);
5237         return ret;
5238 }
5239
5240 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5241 {
5242         struct rpc_task *task;
5243         int ret;
5244
5245         task = _nfs41_proc_sequence(clp, cred);
5246         if (IS_ERR(task)) {
5247                 ret = PTR_ERR(task);
5248                 goto out;
5249         }
5250         ret = rpc_wait_for_completion_task(task);
5251         if (!ret) {
5252                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5253
5254                 if (task->tk_status == 0)
5255                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5256                 ret = task->tk_status;
5257         }
5258         rpc_put_task(task);
5259 out:
5260         dprintk("<-- %s status=%d\n", __func__, ret);
5261         return ret;
5262 }
5263
5264 struct nfs4_reclaim_complete_data {
5265         struct nfs_client *clp;
5266         struct nfs41_reclaim_complete_args arg;
5267         struct nfs41_reclaim_complete_res res;
5268 };
5269
5270 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5271 {
5272         struct nfs4_reclaim_complete_data *calldata = data;
5273
5274         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5275         if (nfs41_setup_sequence(calldata->clp->cl_session,
5276                                 &calldata->arg.seq_args,
5277                                 &calldata->res.seq_res, 0, task))
5278                 return;
5279
5280         rpc_call_start(task);
5281 }
5282
5283 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5284 {
5285         switch(task->tk_status) {
5286         case 0:
5287         case -NFS4ERR_COMPLETE_ALREADY:
5288         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5289                 break;
5290         case -NFS4ERR_DELAY:
5291                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5292                 return -EAGAIN;
5293         default:
5294                 nfs4_schedule_lease_recovery(clp);
5295         }
5296         return 0;
5297 }
5298
5299 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5300 {
5301         struct nfs4_reclaim_complete_data *calldata = data;
5302         struct nfs_client *clp = calldata->clp;
5303         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5304
5305         dprintk("--> %s\n", __func__);
5306         if (!nfs41_sequence_done(task, res))
5307                 return;
5308
5309         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5310                 rpc_restart_call_prepare(task);
5311                 return;
5312         }
5313         dprintk("<-- %s\n", __func__);
5314 }
5315
5316 static void nfs4_free_reclaim_complete_data(void *data)
5317 {
5318         struct nfs4_reclaim_complete_data *calldata = data;
5319
5320         kfree(calldata);
5321 }
5322
5323 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5324         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5325         .rpc_call_done = nfs4_reclaim_complete_done,
5326         .rpc_release = nfs4_free_reclaim_complete_data,
5327 };
5328
5329 /*
5330  * Issue a global reclaim complete.
5331  */
5332 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5333 {
5334         struct nfs4_reclaim_complete_data *calldata;
5335         struct rpc_task *task;
5336         struct rpc_message msg = {
5337                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5338         };
5339         struct rpc_task_setup task_setup_data = {
5340                 .rpc_client = clp->cl_rpcclient,
5341                 .rpc_message = &msg,
5342                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5343                 .flags = RPC_TASK_ASYNC,
5344         };
5345         int status = -ENOMEM;
5346
5347         dprintk("--> %s\n", __func__);
5348         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5349         if (calldata == NULL)
5350                 goto out;
5351         calldata->clp = clp;
5352         calldata->arg.one_fs = 0;
5353
5354         msg.rpc_argp = &calldata->arg;
5355         msg.rpc_resp = &calldata->res;
5356         task_setup_data.callback_data = calldata;
5357         task = rpc_run_task(&task_setup_data);
5358         if (IS_ERR(task)) {
5359                 status = PTR_ERR(task);
5360                 goto out;
5361         }
5362         status = nfs4_wait_for_completion_rpc_task(task);
5363         if (status == 0)
5364                 status = task->tk_status;
5365         rpc_put_task(task);
5366         return 0;
5367 out:
5368         dprintk("<-- %s status=%d\n", __func__, status);
5369         return status;
5370 }
5371
5372 static void
5373 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
5374 {
5375         struct nfs4_layoutget *lgp = calldata;
5376         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5377
5378         dprintk("--> %s\n", __func__);
5379         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
5380          * right now covering the LAYOUTGET we are about to send.
5381          * However, that is not so catastrophic, and there seems
5382          * to be no way to prevent it completely.
5383          */
5384         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
5385                                 &lgp->res.seq_res, 0, task))
5386                 return;
5387         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
5388                                           NFS_I(lgp->args.inode)->layout,
5389                                           lgp->args.ctx->state)) {
5390                 rpc_exit(task, NFS4_OK);
5391                 return;
5392         }
5393         rpc_call_start(task);
5394 }
5395
5396 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
5397 {
5398         struct nfs4_layoutget *lgp = calldata;
5399         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5400
5401         dprintk("--> %s\n", __func__);
5402
5403         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
5404                 return;
5405
5406         switch (task->tk_status) {
5407         case 0:
5408                 break;
5409         case -NFS4ERR_LAYOUTTRYLATER:
5410         case -NFS4ERR_RECALLCONFLICT:
5411                 task->tk_status = -NFS4ERR_DELAY;
5412                 /* Fall through */
5413         default:
5414                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
5415                         rpc_restart_call_prepare(task);
5416                         return;
5417                 }
5418         }
5419         dprintk("<-- %s\n", __func__);
5420 }
5421
5422 static void nfs4_layoutget_release(void *calldata)
5423 {
5424         struct nfs4_layoutget *lgp = calldata;
5425
5426         dprintk("--> %s\n", __func__);
5427         if (lgp->res.layout.buf != NULL)
5428                 free_page((unsigned long) lgp->res.layout.buf);
5429         put_nfs_open_context(lgp->args.ctx);
5430         kfree(calldata);
5431         dprintk("<-- %s\n", __func__);
5432 }
5433
5434 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
5435         .rpc_call_prepare = nfs4_layoutget_prepare,
5436         .rpc_call_done = nfs4_layoutget_done,
5437         .rpc_release = nfs4_layoutget_release,
5438 };
5439
5440 int nfs4_proc_layoutget(struct nfs4_layoutget *lgp)
5441 {
5442         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
5443         struct rpc_task *task;
5444         struct rpc_message msg = {
5445                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
5446                 .rpc_argp = &lgp->args,
5447                 .rpc_resp = &lgp->res,
5448         };
5449         struct rpc_task_setup task_setup_data = {
5450                 .rpc_client = server->client,
5451                 .rpc_message = &msg,
5452                 .callback_ops = &nfs4_layoutget_call_ops,
5453                 .callback_data = lgp,
5454                 .flags = RPC_TASK_ASYNC,
5455         };
5456         int status = 0;
5457
5458         dprintk("--> %s\n", __func__);
5459
5460         lgp->res.layout.buf = (void *)__get_free_page(GFP_NOFS);
5461         if (lgp->res.layout.buf == NULL) {
5462                 nfs4_layoutget_release(lgp);
5463                 return -ENOMEM;
5464         }
5465
5466         lgp->res.seq_res.sr_slot = NULL;
5467         task = rpc_run_task(&task_setup_data);
5468         if (IS_ERR(task))
5469                 return PTR_ERR(task);
5470         status = nfs4_wait_for_completion_rpc_task(task);
5471         if (status == 0)
5472                 status = task->tk_status;
5473         if (status == 0)
5474                 status = pnfs_layout_process(lgp);
5475         rpc_put_task(task);
5476         dprintk("<-- %s status=%d\n", __func__, status);
5477         return status;
5478 }
5479
5480 static int
5481 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5482 {
5483         struct nfs4_getdeviceinfo_args args = {
5484                 .pdev = pdev,
5485         };
5486         struct nfs4_getdeviceinfo_res res = {
5487                 .pdev = pdev,
5488         };
5489         struct rpc_message msg = {
5490                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
5491                 .rpc_argp = &args,
5492                 .rpc_resp = &res,
5493         };
5494         int status;
5495
5496         dprintk("--> %s\n", __func__);
5497         status = nfs4_call_sync(server, &msg, &args, &res, 0);
5498         dprintk("<-- %s status=%d\n", __func__, status);
5499
5500         return status;
5501 }
5502
5503 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
5504 {
5505         struct nfs4_exception exception = { };
5506         int err;
5507
5508         do {
5509                 err = nfs4_handle_exception(server,
5510                                         _nfs4_proc_getdeviceinfo(server, pdev),
5511                                         &exception);
5512         } while (exception.retry);
5513         return err;
5514 }
5515 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
5516
5517 #endif /* CONFIG_NFS_V4_1 */
5518
5519 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5520         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5521         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5522         .recover_open   = nfs4_open_reclaim,
5523         .recover_lock   = nfs4_lock_reclaim,
5524         .establish_clid = nfs4_init_clientid,
5525         .get_clid_cred  = nfs4_get_setclientid_cred,
5526 };
5527
5528 #if defined(CONFIG_NFS_V4_1)
5529 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5530         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5531         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5532         .recover_open   = nfs4_open_reclaim,
5533         .recover_lock   = nfs4_lock_reclaim,
5534         .establish_clid = nfs41_init_clientid,
5535         .get_clid_cred  = nfs4_get_exchange_id_cred,
5536         .reclaim_complete = nfs41_proc_reclaim_complete,
5537 };
5538 #endif /* CONFIG_NFS_V4_1 */
5539
5540 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5541         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5542         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5543         .recover_open   = nfs4_open_expired,
5544         .recover_lock   = nfs4_lock_expired,
5545         .establish_clid = nfs4_init_clientid,
5546         .get_clid_cred  = nfs4_get_setclientid_cred,
5547 };
5548
5549 #if defined(CONFIG_NFS_V4_1)
5550 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5551         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5552         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5553         .recover_open   = nfs4_open_expired,
5554         .recover_lock   = nfs4_lock_expired,
5555         .establish_clid = nfs41_init_clientid,
5556         .get_clid_cred  = nfs4_get_exchange_id_cred,
5557 };
5558 #endif /* CONFIG_NFS_V4_1 */
5559
5560 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5561         .sched_state_renewal = nfs4_proc_async_renew,
5562         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5563         .renew_lease = nfs4_proc_renew,
5564 };
5565
5566 #if defined(CONFIG_NFS_V4_1)
5567 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5568         .sched_state_renewal = nfs41_proc_async_sequence,
5569         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5570         .renew_lease = nfs4_proc_sequence,
5571 };
5572 #endif
5573
5574 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5575         .minor_version = 0,
5576         .call_sync = _nfs4_call_sync,
5577         .validate_stateid = nfs4_validate_delegation_stateid,
5578         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5579         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5580         .state_renewal_ops = &nfs40_state_renewal_ops,
5581 };
5582
5583 #if defined(CONFIG_NFS_V4_1)
5584 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5585         .minor_version = 1,
5586         .call_sync = _nfs4_call_sync_session,
5587         .validate_stateid = nfs41_validate_delegation_stateid,
5588         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5589         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5590         .state_renewal_ops = &nfs41_state_renewal_ops,
5591 };
5592 #endif
5593
5594 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5595         [0] = &nfs_v4_0_minor_ops,
5596 #if defined(CONFIG_NFS_V4_1)
5597         [1] = &nfs_v4_1_minor_ops,
5598 #endif
5599 };
5600
5601 static const struct inode_operations nfs4_file_inode_operations = {
5602         .permission     = nfs_permission,
5603         .getattr        = nfs_getattr,
5604         .setattr        = nfs_setattr,
5605         .getxattr       = generic_getxattr,
5606         .setxattr       = generic_setxattr,
5607         .listxattr      = generic_listxattr,
5608         .removexattr    = generic_removexattr,
5609 };
5610
5611 const struct nfs_rpc_ops nfs_v4_clientops = {
5612         .version        = 4,                    /* protocol version */
5613         .dentry_ops     = &nfs4_dentry_operations,
5614         .dir_inode_ops  = &nfs4_dir_inode_operations,
5615         .file_inode_ops = &nfs4_file_inode_operations,
5616         .getroot        = nfs4_proc_get_root,
5617         .getattr        = nfs4_proc_getattr,
5618         .setattr        = nfs4_proc_setattr,
5619         .lookupfh       = nfs4_proc_lookupfh,
5620         .lookup         = nfs4_proc_lookup,
5621         .access         = nfs4_proc_access,
5622         .readlink       = nfs4_proc_readlink,
5623         .create         = nfs4_proc_create,
5624         .remove         = nfs4_proc_remove,
5625         .unlink_setup   = nfs4_proc_unlink_setup,
5626         .unlink_done    = nfs4_proc_unlink_done,
5627         .rename         = nfs4_proc_rename,
5628         .rename_setup   = nfs4_proc_rename_setup,
5629         .rename_done    = nfs4_proc_rename_done,
5630         .link           = nfs4_proc_link,
5631         .symlink        = nfs4_proc_symlink,
5632         .mkdir          = nfs4_proc_mkdir,
5633         .rmdir          = nfs4_proc_remove,
5634         .readdir        = nfs4_proc_readdir,
5635         .mknod          = nfs4_proc_mknod,
5636         .statfs         = nfs4_proc_statfs,
5637         .fsinfo         = nfs4_proc_fsinfo,
5638         .pathconf       = nfs4_proc_pathconf,
5639         .set_capabilities = nfs4_server_capabilities,
5640         .decode_dirent  = nfs4_decode_dirent,
5641         .read_setup     = nfs4_proc_read_setup,
5642         .read_done      = nfs4_read_done,
5643         .write_setup    = nfs4_proc_write_setup,
5644         .write_done     = nfs4_write_done,
5645         .commit_setup   = nfs4_proc_commit_setup,
5646         .commit_done    = nfs4_commit_done,
5647         .lock           = nfs4_proc_lock,
5648         .clear_acl_cache = nfs4_zap_acl_attr,
5649         .close_context  = nfs4_close_context,
5650         .open_context   = nfs4_atomic_open,
5651 };
5652
5653 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
5654         .prefix = XATTR_NAME_NFSV4_ACL,
5655         .list   = nfs4_xattr_list_nfs4_acl,
5656         .get    = nfs4_xattr_get_nfs4_acl,
5657         .set    = nfs4_xattr_set_nfs4_acl,
5658 };
5659
5660 const struct xattr_handler *nfs4_xattr_handlers[] = {
5661         &nfs4_xattr_nfs4_acl_handler,
5662         NULL
5663 };
5664
5665 /*
5666  * Local variables:
5667  *  c-basic-offset: 8
5668  * End:
5669  */