fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/slab.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/namei.h>
  49 #include <linux/mount.h>
  50 #include <linux/module.h>
  51 #include <linux/sunrpc/bc_xprt.h>
  52
  53 #include "nfs4_fs.h"
  54 #include "delegation.h"
  55 #include "internal.h"
  56 #include "iostat.h"
  57 #include "callback.h"
  58
  59 #define NFSDBG_FACILITY         NFSDBG_PROC
  60
  61 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  62 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  63
  64 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  65
  66 struct nfs4_opendata;
  67 static int _nfs4_proc_open(struct nfs4_opendata *data);
  68 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  69 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  70 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  71 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  72 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  73 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  74                             struct nfs_fattr *fattr, struct iattr *sattr,
  75                             struct nfs4_state *state);
  76
  77 /* Prevent leaks of NFSv4 errors into userland */
  78 static int nfs4_map_errors(int err)
  79 {
  80         if (err >= -1000)
  81                 return err;
  82         switch (err) {
  83         case -NFS4ERR_RESOURCE:
  84                 return -EREMOTEIO;
  85         default:
  86                 dprintk("%s could not handle NFSv4 error %d\n",
  87                                 __func__, -err);
  88                 break;
  89         }
  90         return -EIO;
  91 }
  92
  93 /*
  94  * This is our standard bitmap for GETATTR requests.
  95  */
  96 const u32 nfs4_fattr_bitmap[2] = {
  97         FATTR4_WORD0_TYPE
  98         | FATTR4_WORD0_CHANGE
  99         | FATTR4_WORD0_SIZE
 100         | FATTR4_WORD0_FSID
 101         | FATTR4_WORD0_FILEID,
 102         FATTR4_WORD1_MODE
 103         | FATTR4_WORD1_NUMLINKS
 104         | FATTR4_WORD1_OWNER
 105         | FATTR4_WORD1_OWNER_GROUP
 106         | FATTR4_WORD1_RAWDEV
 107         | FATTR4_WORD1_SPACE_USED
 108         | FATTR4_WORD1_TIME_ACCESS
 109         | FATTR4_WORD1_TIME_METADATA
 110         | FATTR4_WORD1_TIME_MODIFY
 111 };
 112
 113 const u32 nfs4_statfs_bitmap[2] = {
 114         FATTR4_WORD0_FILES_AVAIL
 115         | FATTR4_WORD0_FILES_FREE
 116         | FATTR4_WORD0_FILES_TOTAL,
 117         FATTR4_WORD1_SPACE_AVAIL
 118         | FATTR4_WORD1_SPACE_FREE
 119         | FATTR4_WORD1_SPACE_TOTAL
 120 };
 121
 122 const u32 nfs4_pathconf_bitmap[2] = {
 123         FATTR4_WORD0_MAXLINK
 124         | FATTR4_WORD0_MAXNAME,
 125         0
 126 };
 127
 128 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 129                         | FATTR4_WORD0_MAXREAD
 130                         | FATTR4_WORD0_MAXWRITE
 131                         | FATTR4_WORD0_LEASE_TIME,
 132                         0
 133 };
 134
 135 const u32 nfs4_fs_locations_bitmap[2] = {
 136         FATTR4_WORD0_TYPE
 137         | FATTR4_WORD0_CHANGE
 138         | FATTR4_WORD0_SIZE
 139         | FATTR4_WORD0_FSID
 140         | FATTR4_WORD0_FILEID
 141         | FATTR4_WORD0_FS_LOCATIONS,
 142         FATTR4_WORD1_MODE
 143         | FATTR4_WORD1_NUMLINKS
 144         | FATTR4_WORD1_OWNER
 145         | FATTR4_WORD1_OWNER_GROUP
 146         | FATTR4_WORD1_RAWDEV
 147         | FATTR4_WORD1_SPACE_USED
 148         | FATTR4_WORD1_TIME_ACCESS
 149         | FATTR4_WORD1_TIME_METADATA
 150         | FATTR4_WORD1_TIME_MODIFY
 151         | FATTR4_WORD1_MOUNTED_ON_FILEID
 152 };
 153
 154 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 155                 struct nfs4_readdir_arg *readdir)
 156 {
 157         __be32 *start, *p;
 158
 159         BUG_ON(readdir->count < 80);
 160         if (cookie > 2) {
 161                 readdir->cookie = cookie;
 162                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 163                 return;
 164         }
 165
 166         readdir->cookie = 0;
 167         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 168         if (cookie == 2)
 169                 return;
 170
 171         /*
 172          * NFSv4 servers do not return entries for '.' and '..'
 173          * Therefore, we fake these entries here.  We let '.'
 174          * have cookie 0 and '..' have cookie 1.  Note that
 175          * when talking to the server, we always send cookie 0
 176          * instead of 1 or 2.
 177          */
 178         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 179
 180         if (cookie == 0) {
 181                 *p++ = xdr_one;                                  /* next */
 182                 *p++ = xdr_zero;                   /* cookie, first word */
 183                 *p++ = xdr_one;                   /* cookie, second word */
 184                 *p++ = xdr_one;                             /* entry len */
 185                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 186                 p++;
 187                 *p++ = xdr_one;                         /* bitmap length */
 188                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 189                 *p++ = htonl(8);              /* attribute buffer length */
 190                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 191         }
 192
 193         *p++ = xdr_one;                                  /* next */
 194         *p++ = xdr_zero;                   /* cookie, first word */
 195         *p++ = xdr_two;                   /* cookie, second word */
 196         *p++ = xdr_two;                             /* entry len */
 197         memcpy(p, "..\0\0", 4);                         /* entry */
 198         p++;
 199         *p++ = xdr_one;                         /* bitmap length */
 200         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 201         *p++ = htonl(8);              /* attribute buffer length */
 202         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 203
 204         readdir->pgbase = (char *)p - (char *)start;
 205         readdir->count -= readdir->pgbase;
 206         kunmap_atomic(start, KM_USER0);
 207 }
 208
 209 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 210 {
 211         int res;
 212
 213         might_sleep();
 214
 215         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 216                         nfs_wait_bit_killable, TASK_KILLABLE);
 217         return res;
 218 }
 219
 220 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 221 {
 222         int res = 0;
 223
 224         might_sleep();
 225
 226         if (*timeout <= 0)
 227                 *timeout = NFS4_POLL_RETRY_MIN;
 228         if (*timeout > NFS4_POLL_RETRY_MAX)
 229                 *timeout = NFS4_POLL_RETRY_MAX;
 230         schedule_timeout_killable(*timeout);
 231         if (fatal_signal_pending(current))
 232                 res = -ERESTARTSYS;
 233         *timeout <<= 1;
 234         return res;
 235 }
 236
 237 /* This is the error handling routine for processes that are allowed
 238  * to sleep.
 239  */
 240 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 241 {
 242         struct nfs_client *clp = server->nfs_client;
 243         struct nfs4_state *state = exception->state;
 244         int ret = errorcode;
 245
 246         exception->retry = 0;
 247         switch(errorcode) {
 248                 case 0:
 249                         return 0;
 250                 case -NFS4ERR_ADMIN_REVOKED:
 251                 case -NFS4ERR_BAD_STATEID:
 252                 case -NFS4ERR_OPENMODE:
 253                         if (state == NULL)
 254                                 break;
 255                         nfs4_state_mark_reclaim_nograce(clp, state);
 256                         goto do_state_recovery;
 257                 case -NFS4ERR_STALE_STATEID:
 258                         if (state == NULL)
 259                                 break;
 260                         nfs4_state_mark_reclaim_reboot(clp, state);
 261                 case -NFS4ERR_STALE_CLIENTID:
 262                 case -NFS4ERR_EXPIRED:
 263                         goto do_state_recovery;
 264 #if defined(CONFIG_NFS_V4_1)
 265                 case -NFS4ERR_BADSESSION:
 266                 case -NFS4ERR_BADSLOT:
 267                 case -NFS4ERR_BAD_HIGH_SLOT:
 268                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 269                 case -NFS4ERR_DEADSESSION:
 270                 case -NFS4ERR_SEQ_FALSE_RETRY:
 271                 case -NFS4ERR_SEQ_MISORDERED:
 272                         dprintk("%s ERROR: %d Reset session\n", __func__,
 273                                 errorcode);
 274                         nfs4_schedule_state_recovery(clp);
 275                         exception->retry = 1;
 276                         break;
 277 #endif /* defined(CONFIG_NFS_V4_1) */
 278                 case -NFS4ERR_FILE_OPEN:
 279                         if (exception->timeout > HZ) {
 280                                 /* We have retried a decent amount, time to
 281                                  * fail
 282                                  */
 283                                 ret = -EBUSY;
 284                                 break;
 285                         }
 286                 case -NFS4ERR_GRACE:
 287                 case -NFS4ERR_DELAY:
 288                 case -EKEYEXPIRED:
 289                         ret = nfs4_delay(server->client, &exception->timeout);
 290                         if (ret != 0)
 291                                 break;
 292                 case -NFS4ERR_OLD_STATEID:
 293                         exception->retry = 1;
 294         }
 295         /* We failed to handle the error */
 296         return nfs4_map_errors(ret);
 297 do_state_recovery:
 298         nfs4_schedule_state_recovery(clp);
 299         ret = nfs4_wait_clnt_recover(clp);
 300         if (ret == 0)
 301                 exception->retry = 1;
 302         return ret;
 303 }
 304
 305
 306 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 307 {
 308         struct nfs_client *clp = server->nfs_client;
 309         spin_lock(&clp->cl_lock);
 310         if (time_before(clp->cl_last_renewal,timestamp))
 311                 clp->cl_last_renewal = timestamp;
 312         spin_unlock(&clp->cl_lock);
 313 }
 314
 315 #if defined(CONFIG_NFS_V4_1)
 316
 317 /*
 318  * nfs4_free_slot - free a slot and efficiently update slot table.
 319  *
 320  * freeing a slot is trivially done by clearing its respective bit
 321  * in the bitmap.
 322  * If the freed slotid equals highest_used_slotid we want to update it
 323  * so that the server would be able to size down the slot table if needed,
 324  * otherwise we know that the highest_used_slotid is still in use.
 325  * When updating highest_used_slotid there may be "holes" in the bitmap
 326  * so we need to scan down from highest_used_slotid to 0 looking for the now
 327  * highest slotid in use.
 328  * If none found, highest_used_slotid is set to -1.
 329  *
 330  * Must be called while holding tbl->slot_tbl_lock
 331  */
 332 static void
 333 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 334 {
 335         int slotid = free_slotid;
 336
 337         /* clear used bit in bitmap */
 338         __clear_bit(slotid, tbl->used_slots);
 339
 340         /* update highest_used_slotid when it is freed */
 341         if (slotid == tbl->highest_used_slotid) {
 342                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 343                 if (slotid < tbl->max_slots)
 344                         tbl->highest_used_slotid = slotid;
 345                 else
 346                         tbl->highest_used_slotid = -1;
 347         }
 348         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 349                 free_slotid, tbl->highest_used_slotid);
 350 }
 351
 352 /*
 353  * Signal state manager thread if session is drained
 354  */
 355 static void nfs41_check_drain_session_complete(struct nfs4_session *ses)
 356 {
 357         struct rpc_task *task;
 358
 359         if (!test_bit(NFS4_SESSION_DRAINING, &ses->session_state)) {
 360                 task = rpc_wake_up_next(&ses->fc_slot_table.slot_tbl_waitq);
 361                 if (task)
 362                         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 363                 return;
 364         }
 365
 366         if (ses->fc_slot_table.highest_used_slotid != -1)
 367                 return;
 368
 369         dprintk("%s COMPLETE: Session Drained\n", __func__);
 370         complete(&ses->complete);
 371 }
 372
 373 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 374 {
 375         struct nfs4_slot_table *tbl;
 376
 377         tbl = &res->sr_session->fc_slot_table;
 378         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
 379                 /* just wake up the next guy waiting since
 380                  * we may have not consumed a slot after all */
 381                 dprintk("%s: No slot\n", __func__);
 382                 return;
 383         }
 384
 385         spin_lock(&tbl->slot_tbl_lock);
 386         nfs4_free_slot(tbl, res->sr_slotid);
 387         nfs41_check_drain_session_complete(res->sr_session);
 388         spin_unlock(&tbl->slot_tbl_lock);
 389         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 390 }
 391
 392 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 393 {
 394         unsigned long timestamp;
 395         struct nfs4_slot_table *tbl;
 396         struct nfs4_slot *slot;
 397         struct nfs_client *clp;
 398
 399         /*
 400          * sr_status remains 1 if an RPC level error occurred. The server
 401          * may or may not have processed the sequence operation..
 402          * Proceed as if the server received and processed the sequence
 403          * operation.
 404          */
 405         if (res->sr_status == 1)
 406                 res->sr_status = NFS_OK;
 407
 408         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 409         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
 410                 goto out;
 411
 412         tbl = &res->sr_session->fc_slot_table;
 413         slot = tbl->slots + res->sr_slotid;
 414
 415         /* Check the SEQUENCE operation status */
 416         switch (res->sr_status) {
 417         case 0:
 418                 /* Update the slot's sequence and clientid lease timer */
 419                 ++slot->seq_nr;
 420                 timestamp = res->sr_renewal_time;
 421                 clp = res->sr_session->clp;
 422                 spin_lock(&clp->cl_lock);
 423                 if (time_before(clp->cl_last_renewal, timestamp))
 424                         clp->cl_last_renewal = timestamp;
 425                 spin_unlock(&clp->cl_lock);
 426                 /* Check sequence flags */
 427                 if (atomic_read(&clp->cl_count) > 1)
 428                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 429                 break;
 430         case -NFS4ERR_DELAY:
 431                 /* The server detected a resend of the RPC call and
 432                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 433                  * of RFC5661.
 434                  */
 435                 dprintk("%s: slot=%d seq=%d: Operation in progress\n",
 436                                 __func__, res->sr_slotid, slot->seq_nr);
 437                 goto out_retry;
 438         default:
 439                 /* Just update the slot sequence no. */
 440                 ++slot->seq_nr;
 441         }
 442 out:
 443         /* The session may be reset by one of the error handlers. */
 444         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 445         nfs41_sequence_free_slot(res);
 446         return 1;
 447 out_retry:
 448         rpc_restart_call(task);
 449         /* FIXME: rpc_restart_call() should be made to return success/fail */
 450         if (task->tk_action == NULL)
 451                 goto out;
 452         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 453         return 0;
 454 }
 455
 456 static int nfs4_sequence_done(struct rpc_task *task,
 457                                struct nfs4_sequence_res *res)
 458 {
 459         if (res->sr_session == NULL)
 460                 return 1;
 461         return nfs41_sequence_done(task, res);
 462 }
 463
 464 /*
 465  * nfs4_find_slot - efficiently look for a free slot
 466  *
 467  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 468  * If found, we mark the slot as used, update the highest_used_slotid,
 469  * and respectively set up the sequence operation args.
 470  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 471  *
 472  * Note: must be called with under the slot_tbl_lock.
 473  */
 474 static u8
 475 nfs4_find_slot(struct nfs4_slot_table *tbl)
 476 {
 477         int slotid;
 478         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 479         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 480
 481         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 482                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 483                 tbl->max_slots);
 484         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 485         if (slotid >= tbl->max_slots)
 486                 goto out;
 487         __set_bit(slotid, tbl->used_slots);
 488         if (slotid > tbl->highest_used_slotid)
 489                 tbl->highest_used_slotid = slotid;
 490         ret_id = slotid;
 491 out:
 492         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 493                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 494         return ret_id;
 495 }
 496
 497 static int nfs41_setup_sequence(struct nfs4_session *session,
 498                                 struct nfs4_sequence_args *args,
 499                                 struct nfs4_sequence_res *res,
 500                                 int cache_reply,
 501                                 struct rpc_task *task)
 502 {
 503         struct nfs4_slot *slot;
 504         struct nfs4_slot_table *tbl;
 505         u8 slotid;
 506
 507         dprintk("--> %s\n", __func__);
 508         /* slot already allocated? */
 509         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
 510                 return 0;
 511
 512         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 513         tbl = &session->fc_slot_table;
 514
 515         spin_lock(&tbl->slot_tbl_lock);
 516         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 517             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 518                 /*
 519                  * The state manager will wait until the slot table is empty.
 520                  * Schedule the reset thread
 521                  */
 522                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 523                 spin_unlock(&tbl->slot_tbl_lock);
 524                 dprintk("%s Schedule Session Reset\n", __func__);
 525                 return -EAGAIN;
 526         }
 527
 528         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 529             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 530                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 531                 spin_unlock(&tbl->slot_tbl_lock);
 532                 dprintk("%s enforce FIFO order\n", __func__);
 533                 return -EAGAIN;
 534         }
 535
 536         slotid = nfs4_find_slot(tbl);
 537         if (slotid == NFS4_MAX_SLOT_TABLE) {
 538                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 539                 spin_unlock(&tbl->slot_tbl_lock);
 540                 dprintk("<-- %s: no free slots\n", __func__);
 541                 return -EAGAIN;
 542         }
 543         spin_unlock(&tbl->slot_tbl_lock);
 544
 545         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 546         slot = tbl->slots + slotid;
 547         args->sa_session = session;
 548         args->sa_slotid = slotid;
 549         args->sa_cache_this = cache_reply;
 550
 551         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 552
 553         res->sr_session = session;
 554         res->sr_slotid = slotid;
 555         res->sr_renewal_time = jiffies;
 556         res->sr_status_flags = 0;
 557         /*
 558          * sr_status is only set in decode_sequence, and so will remain
 559          * set to 1 if an rpc level failure occurs.
 560          */
 561         res->sr_status = 1;
 562         return 0;
 563 }
 564
 565 int nfs4_setup_sequence(const struct nfs_server *server,
 566                         struct nfs4_sequence_args *args,
 567                         struct nfs4_sequence_res *res,
 568                         int cache_reply,
 569                         struct rpc_task *task)
 570 {
 571         struct nfs4_session *session = nfs4_get_session(server);
 572         int ret = 0;
 573
 574         if (session == NULL) {
 575                 args->sa_session = NULL;
 576                 res->sr_session = NULL;
 577                 goto out;
 578         }
 579
 580         dprintk("--> %s clp %p session %p sr_slotid %d\n",
 581                 __func__, session->clp, session, res->sr_slotid);
 582
 583         ret = nfs41_setup_sequence(session, args, res, cache_reply,
 584                                    task);
 585 out:
 586         dprintk("<-- %s status=%d\n", __func__, ret);
 587         return ret;
 588 }
 589
 590 struct nfs41_call_sync_data {
 591         const struct nfs_server *seq_server;
 592         struct nfs4_sequence_args *seq_args;
 593         struct nfs4_sequence_res *seq_res;
 594         int cache_reply;
 595 };
 596
 597 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 598 {
 599         struct nfs41_call_sync_data *data = calldata;
 600
 601         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 602
 603         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 604                                 data->seq_res, data->cache_reply, task))
 605                 return;
 606         rpc_call_start(task);
 607 }
 608
 609 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 610 {
 611         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 612         nfs41_call_sync_prepare(task, calldata);
 613 }
 614
 615 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 616 {
 617         struct nfs41_call_sync_data *data = calldata;
 618
 619         nfs41_sequence_done(task, data->seq_res);
 620 }
 621
 622 struct rpc_call_ops nfs41_call_sync_ops = {
 623         .rpc_call_prepare = nfs41_call_sync_prepare,
 624         .rpc_call_done = nfs41_call_sync_done,
 625 };
 626
 627 struct rpc_call_ops nfs41_call_priv_sync_ops = {
 628         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 629         .rpc_call_done = nfs41_call_sync_done,
 630 };
 631
 632 static int nfs4_call_sync_sequence(struct nfs_server *server,
 633                                    struct rpc_message *msg,
 634                                    struct nfs4_sequence_args *args,
 635                                    struct nfs4_sequence_res *res,
 636                                    int cache_reply,
 637                                    int privileged)
 638 {
 639         int ret;
 640         struct rpc_task *task;
 641         struct nfs41_call_sync_data data = {
 642                 .seq_server = server,
 643                 .seq_args = args,
 644                 .seq_res = res,
 645                 .cache_reply = cache_reply,
 646         };
 647         struct rpc_task_setup task_setup = {
 648                 .rpc_client = server->client,
 649                 .rpc_message = msg,
 650                 .callback_ops = &nfs41_call_sync_ops,
 651                 .callback_data = &data
 652         };
 653
 654         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 655         if (privileged)
 656                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 657         task = rpc_run_task(&task_setup);
 658         if (IS_ERR(task))
 659                 ret = PTR_ERR(task);
 660         else {
 661                 ret = task->tk_status;
 662                 rpc_put_task(task);
 663         }
 664         return ret;
 665 }
 666
 667 int _nfs4_call_sync_session(struct nfs_server *server,
 668                             struct rpc_message *msg,
 669                             struct nfs4_sequence_args *args,
 670                             struct nfs4_sequence_res *res,
 671                             int cache_reply)
 672 {
 673         return nfs4_call_sync_sequence(server, msg, args, res, cache_reply, 0);
 674 }
 675
 676 #else
 677 static int nfs4_sequence_done(struct rpc_task *task,
 678                                struct nfs4_sequence_res *res)
 679 {
 680         return 1;
 681 }
 682 #endif /* CONFIG_NFS_V4_1 */
 683
 684 int _nfs4_call_sync(struct nfs_server *server,
 685                     struct rpc_message *msg,
 686                     struct nfs4_sequence_args *args,
 687                     struct nfs4_sequence_res *res,
 688                     int cache_reply)
 689 {
 690         args->sa_session = res->sr_session = NULL;
 691         return rpc_call_sync(server->client, msg, 0);
 692 }
 693
 694 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 695         (server)->nfs_client->cl_mvops->call_sync((server), (msg), &(args)->seq_args, \
 696                         &(res)->seq_res, (cache_reply))
 697
 698 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 699 {
 700         struct nfs_inode *nfsi = NFS_I(dir);
 701
 702         spin_lock(&dir->i_lock);
 703         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 704         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 705                 nfs_force_lookup_revalidate(dir);
 706         nfsi->change_attr = cinfo->after;
 707         spin_unlock(&dir->i_lock);
 708 }
 709
 710 struct nfs4_opendata {
 711         struct kref kref;
 712         struct nfs_openargs o_arg;
 713         struct nfs_openres o_res;
 714         struct nfs_open_confirmargs c_arg;
 715         struct nfs_open_confirmres c_res;
 716         struct nfs_fattr f_attr;
 717         struct nfs_fattr dir_attr;
 718         struct path path;
 719         struct dentry *dir;
 720         struct nfs4_state_owner *owner;
 721         struct nfs4_state *state;
 722         struct iattr attrs;
 723         unsigned long timestamp;
 724         unsigned int rpc_done : 1;
 725         int rpc_status;
 726         int cancelled;
 727 };
 728
 729
 730 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 731 {
 732         p->o_res.f_attr = &p->f_attr;
 733         p->o_res.dir_attr = &p->dir_attr;
 734         p->o_res.seqid = p->o_arg.seqid;
 735         p->c_res.seqid = p->c_arg.seqid;
 736         p->o_res.server = p->o_arg.server;
 737         nfs_fattr_init(&p->f_attr);
 738         nfs_fattr_init(&p->dir_attr);
 739         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
 740 }
 741
 742 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 743                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 744                 const struct iattr *attrs,
 745                 gfp_t gfp_mask)
 746 {
 747         struct dentry *parent = dget_parent(path->dentry);
 748         struct inode *dir = parent->d_inode;
 749         struct nfs_server *server = NFS_SERVER(dir);
 750         struct nfs4_opendata *p;
 751
 752         p = kzalloc(sizeof(*p), gfp_mask);
 753         if (p == NULL)
 754                 goto err;
 755         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 756         if (p->o_arg.seqid == NULL)
 757                 goto err_free;
 758         path_get(path);
 759         p->path = *path;
 760         p->dir = parent;
 761         p->owner = sp;
 762         atomic_inc(&sp->so_count);
 763         p->o_arg.fh = NFS_FH(dir);
 764         p->o_arg.open_flags = flags;
 765         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 766         p->o_arg.clientid = server->nfs_client->cl_clientid;
 767         p->o_arg.id = sp->so_owner_id.id;
 768         p->o_arg.name = &p->path.dentry->d_name;
 769         p->o_arg.server = server;
 770         p->o_arg.bitmask = server->attr_bitmask;
 771         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 772         if (flags & O_CREAT) {
 773                 u32 *s;
 774
 775                 p->o_arg.u.attrs = &p->attrs;
 776                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 777                 s = (u32 *) p->o_arg.u.verifier.data;
 778                 s[0] = jiffies;
 779                 s[1] = current->pid;
 780         }
 781         p->c_arg.fh = &p->o_res.fh;
 782         p->c_arg.stateid = &p->o_res.stateid;
 783         p->c_arg.seqid = p->o_arg.seqid;
 784         nfs4_init_opendata_res(p);
 785         kref_init(&p->kref);
 786         return p;
 787 err_free:
 788         kfree(p);
 789 err:
 790         dput(parent);
 791         return NULL;
 792 }
 793
 794 static void nfs4_opendata_free(struct kref *kref)
 795 {
 796         struct nfs4_opendata *p = container_of(kref,
 797                         struct nfs4_opendata, kref);
 798
 799         nfs_free_seqid(p->o_arg.seqid);
 800         if (p->state != NULL)
 801                 nfs4_put_open_state(p->state);
 802         nfs4_put_state_owner(p->owner);
 803         dput(p->dir);
 804         path_put(&p->path);
 805         kfree(p);
 806 }
 807
 808 static void nfs4_opendata_put(struct nfs4_opendata *p)
 809 {
 810         if (p != NULL)
 811                 kref_put(&p->kref, nfs4_opendata_free);
 812 }
 813
 814 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 815 {
 816         int ret;
 817
 818         ret = rpc_wait_for_completion_task(task);
 819         return ret;
 820 }
 821
 822 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 823 {
 824         int ret = 0;
 825
 826         if (open_mode & O_EXCL)
 827                 goto out;
 828         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 829                 case FMODE_READ:
 830                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 831                                 && state->n_rdonly != 0;
 832                         break;
 833                 case FMODE_WRITE:
 834                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 835                                 && state->n_wronly != 0;
 836                         break;
 837                 case FMODE_READ|FMODE_WRITE:
 838                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 839                                 && state->n_rdwr != 0;
 840         }
 841 out:
 842         return ret;
 843 }
 844
 845 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 846 {
 847         if ((delegation->type & fmode) != fmode)
 848                 return 0;
 849         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 850                 return 0;
 851         nfs_mark_delegation_referenced(delegation);
 852         return 1;
 853 }
 854
 855 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 856 {
 857         switch (fmode) {
 858                 case FMODE_WRITE:
 859                         state->n_wronly++;
 860                         break;
 861                 case FMODE_READ:
 862                         state->n_rdonly++;
 863                         break;
 864                 case FMODE_READ|FMODE_WRITE:
 865                         state->n_rdwr++;
 866         }
 867         nfs4_state_set_mode_locked(state, state->state | fmode);
 868 }
 869
 870 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 871 {
 872         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 873                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 874         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 875         switch (fmode) {
 876                 case FMODE_READ:
 877                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 878                         break;
 879                 case FMODE_WRITE:
 880                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 881                         break;
 882                 case FMODE_READ|FMODE_WRITE:
 883                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 884         }
 885 }
 886
 887 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 888 {
 889         write_seqlock(&state->seqlock);
 890         nfs_set_open_stateid_locked(state, stateid, fmode);
 891         write_sequnlock(&state->seqlock);
 892 }
 893
 894 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 895 {
 896         /*
 897          * Protect the call to nfs4_state_set_mode_locked and
 898          * serialise the stateid update
 899          */
 900         write_seqlock(&state->seqlock);
 901         if (deleg_stateid != NULL) {
 902                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 903                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 904         }
 905         if (open_stateid != NULL)
 906                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 907         write_sequnlock(&state->seqlock);
 908         spin_lock(&state->owner->so_lock);
 909         update_open_stateflags(state, fmode);
 910         spin_unlock(&state->owner->so_lock);
 911 }
 912
 913 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 914 {
 915         struct nfs_inode *nfsi = NFS_I(state->inode);
 916         struct nfs_delegation *deleg_cur;
 917         int ret = 0;
 918
 919         fmode &= (FMODE_READ|FMODE_WRITE);
 920
 921         rcu_read_lock();
 922         deleg_cur = rcu_dereference(nfsi->delegation);
 923         if (deleg_cur == NULL)
 924                 goto no_delegation;
 925
 926         spin_lock(&deleg_cur->lock);
 927         if (nfsi->delegation != deleg_cur ||
 928             (deleg_cur->type & fmode) != fmode)
 929                 goto no_delegation_unlock;
 930
 931         if (delegation == NULL)
 932                 delegation = &deleg_cur->stateid;
 933         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 934                 goto no_delegation_unlock;
 935
 936         nfs_mark_delegation_referenced(deleg_cur);
 937         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 938         ret = 1;
 939 no_delegation_unlock:
 940         spin_unlock(&deleg_cur->lock);
 941 no_delegation:
 942         rcu_read_unlock();
 943
 944         if (!ret && open_stateid != NULL) {
 945                 __update_open_stateid(state, open_stateid, NULL, fmode);
 946                 ret = 1;
 947         }
 948
 949         return ret;
 950 }
 951
 952
 953 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 954 {
 955         struct nfs_delegation *delegation;
 956
 957         rcu_read_lock();
 958         delegation = rcu_dereference(NFS_I(inode)->delegation);
 959         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 960                 rcu_read_unlock();
 961                 return;
 962         }
 963         rcu_read_unlock();
 964         nfs_inode_return_delegation(inode);
 965 }
 966
 967 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 968 {
 969         struct nfs4_state *state = opendata->state;
 970         struct nfs_inode *nfsi = NFS_I(state->inode);
 971         struct nfs_delegation *delegation;
 972         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 973         fmode_t fmode = opendata->o_arg.fmode;
 974         nfs4_stateid stateid;
 975         int ret = -EAGAIN;
 976
 977         for (;;) {
 978                 if (can_open_cached(state, fmode, open_mode)) {
 979                         spin_lock(&state->owner->so_lock);
 980                         if (can_open_cached(state, fmode, open_mode)) {
 981                                 update_open_stateflags(state, fmode);
 982                                 spin_unlock(&state->owner->so_lock);
 983                                 goto out_return_state;
 984                         }
 985                         spin_unlock(&state->owner->so_lock);
 986                 }
 987                 rcu_read_lock();
 988                 delegation = rcu_dereference(nfsi->delegation);
 989                 if (delegation == NULL ||
 990                     !can_open_delegated(delegation, fmode)) {
 991                         rcu_read_unlock();
 992                         break;
 993                 }
 994                 /* Save the delegation */
 995                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 996                 rcu_read_unlock();
 997                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 998                 if (ret != 0)
 999                         goto out;
1000                 ret = -EAGAIN;
1001
1002                 /* Try to update the stateid using the delegation */
1003                 if (update_open_stateid(state, NULL, &stateid, fmode))
1004                         goto out_return_state;
1005         }
1006 out:
1007         return ERR_PTR(ret);
1008 out_return_state:
1009         atomic_inc(&state->count);
1010         return state;
1011 }
1012
1013 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1014 {
1015         struct inode *inode;
1016         struct nfs4_state *state = NULL;
1017         struct nfs_delegation *delegation;
1018         int ret;
1019
1020         if (!data->rpc_done) {
1021                 state = nfs4_try_open_cached(data);
1022                 goto out;
1023         }
1024
1025         ret = -EAGAIN;
1026         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1027                 goto err;
1028         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1029         ret = PTR_ERR(inode);
1030         if (IS_ERR(inode))
1031                 goto err;
1032         ret = -ENOMEM;
1033         state = nfs4_get_open_state(inode, data->owner);
1034         if (state == NULL)
1035                 goto err_put_inode;
1036         if (data->o_res.delegation_type != 0) {
1037                 int delegation_flags = 0;
1038
1039                 rcu_read_lock();
1040                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1041                 if (delegation)
1042                         delegation_flags = delegation->flags;
1043                 rcu_read_unlock();
1044                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1045                         nfs_inode_set_delegation(state->inode,
1046                                         data->owner->so_cred,
1047                                         &data->o_res);
1048                 else
1049                         nfs_inode_reclaim_delegation(state->inode,
1050                                         data->owner->so_cred,
1051                                         &data->o_res);
1052         }
1053
1054         update_open_stateid(state, &data->o_res.stateid, NULL,
1055                         data->o_arg.fmode);
1056         iput(inode);
1057 out:
1058         return state;
1059 err_put_inode:
1060         iput(inode);
1061 err:
1062         return ERR_PTR(ret);
1063 }
1064
1065 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1066 {
1067         struct nfs_inode *nfsi = NFS_I(state->inode);
1068         struct nfs_open_context *ctx;
1069
1070         spin_lock(&state->inode->i_lock);
1071         list_for_each_entry(ctx, &nfsi->open_files, list) {
1072                 if (ctx->state != state)
1073                         continue;
1074                 get_nfs_open_context(ctx);
1075                 spin_unlock(&state->inode->i_lock);
1076                 return ctx;
1077         }
1078         spin_unlock(&state->inode->i_lock);
1079         return ERR_PTR(-ENOENT);
1080 }
1081
1082 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1083 {
1084         struct nfs4_opendata *opendata;
1085
1086         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL, GFP_NOFS);
1087         if (opendata == NULL)
1088                 return ERR_PTR(-ENOMEM);
1089         opendata->state = state;
1090         atomic_inc(&state->count);
1091         return opendata;
1092 }
1093
1094 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1095 {
1096         struct nfs4_state *newstate;
1097         int ret;
1098
1099         opendata->o_arg.open_flags = 0;
1100         opendata->o_arg.fmode = fmode;
1101         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1102         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1103         nfs4_init_opendata_res(opendata);
1104         ret = _nfs4_recover_proc_open(opendata);
1105         if (ret != 0)
1106                 return ret;
1107         newstate = nfs4_opendata_to_nfs4_state(opendata);
1108         if (IS_ERR(newstate))
1109                 return PTR_ERR(newstate);
1110         nfs4_close_state(&opendata->path, newstate, fmode);
1111         *res = newstate;
1112         return 0;
1113 }
1114
1115 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1116 {
1117         struct nfs4_state *newstate;
1118         int ret;
1119
1120         /* memory barrier prior to reading state->n_* */
1121         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1122         smp_rmb();
1123         if (state->n_rdwr != 0) {
1124                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1125                 if (ret != 0)
1126                         return ret;
1127                 if (newstate != state)
1128                         return -ESTALE;
1129         }
1130         if (state->n_wronly != 0) {
1131                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1132                 if (ret != 0)
1133                         return ret;
1134                 if (newstate != state)
1135                         return -ESTALE;
1136         }
1137         if (state->n_rdonly != 0) {
1138                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1139                 if (ret != 0)
1140                         return ret;
1141                 if (newstate != state)
1142                         return -ESTALE;
1143         }
1144         /*
1145          * We may have performed cached opens for all three recoveries.
1146          * Check if we need to update the current stateid.
1147          */
1148         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1149             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1150                 write_seqlock(&state->seqlock);
1151                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1152                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1153                 write_sequnlock(&state->seqlock);
1154         }
1155         return 0;
1156 }
1157
1158 /*
1159  * OPEN_RECLAIM:
1160  *      reclaim state on the server after a reboot.
1161  */
1162 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1163 {
1164         struct nfs_delegation *delegation;
1165         struct nfs4_opendata *opendata;
1166         fmode_t delegation_type = 0;
1167         int status;
1168
1169         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1170         if (IS_ERR(opendata))
1171                 return PTR_ERR(opendata);
1172         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1173         opendata->o_arg.fh = NFS_FH(state->inode);
1174         rcu_read_lock();
1175         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1176         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1177                 delegation_type = delegation->type;
1178         rcu_read_unlock();
1179         opendata->o_arg.u.delegation_type = delegation_type;
1180         status = nfs4_open_recover(opendata, state);
1181         nfs4_opendata_put(opendata);
1182         return status;
1183 }
1184
1185 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1186 {
1187         struct nfs_server *server = NFS_SERVER(state->inode);
1188         struct nfs4_exception exception = { };
1189         int err;
1190         do {
1191                 err = _nfs4_do_open_reclaim(ctx, state);
1192                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
1193                         break;
1194                 nfs4_handle_exception(server, err, &exception);
1195         } while (exception.retry);
1196         return err;
1197 }
1198
1199 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1200 {
1201         struct nfs_open_context *ctx;
1202         int ret;
1203
1204         ctx = nfs4_state_find_open_context(state);
1205         if (IS_ERR(ctx))
1206                 return PTR_ERR(ctx);
1207         ret = nfs4_do_open_reclaim(ctx, state);
1208         put_nfs_open_context(ctx);
1209         return ret;
1210 }
1211
1212 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1213 {
1214         struct nfs4_opendata *opendata;
1215         int ret;
1216
1217         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1218         if (IS_ERR(opendata))
1219                 return PTR_ERR(opendata);
1220         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1221         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1222                         sizeof(opendata->o_arg.u.delegation.data));
1223         ret = nfs4_open_recover(opendata, state);
1224         nfs4_opendata_put(opendata);
1225         return ret;
1226 }
1227
1228 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1229 {
1230         struct nfs4_exception exception = { };
1231         struct nfs_server *server = NFS_SERVER(state->inode);
1232         int err;
1233         do {
1234                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1235                 switch (err) {
1236                         case 0:
1237                         case -ENOENT:
1238                         case -ESTALE:
1239                                 goto out;
1240                         case -NFS4ERR_BADSESSION:
1241                         case -NFS4ERR_BADSLOT:
1242                         case -NFS4ERR_BAD_HIGH_SLOT:
1243                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1244                         case -NFS4ERR_DEADSESSION:
1245                                 nfs4_schedule_state_recovery(
1246                                         server->nfs_client);
1247                                 goto out;
1248                         case -NFS4ERR_STALE_CLIENTID:
1249                         case -NFS4ERR_STALE_STATEID:
1250                         case -NFS4ERR_EXPIRED:
1251                                 /* Don't recall a delegation if it was lost */
1252                                 nfs4_schedule_state_recovery(server->nfs_client);
1253                                 goto out;
1254                         case -ERESTARTSYS:
1255                                 /*
1256                                  * The show must go on: exit, but mark the
1257                                  * stateid as needing recovery.
1258                                  */
1259                         case -NFS4ERR_ADMIN_REVOKED:
1260                         case -NFS4ERR_BAD_STATEID:
1261                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1262                         case -ENOMEM:
1263                                 err = 0;
1264                                 goto out;
1265                 }
1266                 err = nfs4_handle_exception(server, err, &exception);
1267         } while (exception.retry);
1268 out:
1269         return err;
1270 }
1271
1272 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1273 {
1274         struct nfs4_opendata *data = calldata;
1275
1276         data->rpc_status = task->tk_status;
1277         if (RPC_ASSASSINATED(task))
1278                 return;
1279         if (data->rpc_status == 0) {
1280                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1281                                 sizeof(data->o_res.stateid.data));
1282                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1283                 renew_lease(data->o_res.server, data->timestamp);
1284                 data->rpc_done = 1;
1285         }
1286 }
1287
1288 static void nfs4_open_confirm_release(void *calldata)
1289 {
1290         struct nfs4_opendata *data = calldata;
1291         struct nfs4_state *state = NULL;
1292
1293         /* If this request hasn't been cancelled, do nothing */
1294         if (data->cancelled == 0)
1295                 goto out_free;
1296         /* In case of error, no cleanup! */
1297         if (!data->rpc_done)
1298                 goto out_free;
1299         state = nfs4_opendata_to_nfs4_state(data);
1300         if (!IS_ERR(state))
1301                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1302 out_free:
1303         nfs4_opendata_put(data);
1304 }
1305
1306 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1307         .rpc_call_done = nfs4_open_confirm_done,
1308         .rpc_release = nfs4_open_confirm_release,
1309 };
1310
1311 /*
1312  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1313  */
1314 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1315 {
1316         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1317         struct rpc_task *task;
1318         struct  rpc_message msg = {
1319                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1320                 .rpc_argp = &data->c_arg,
1321                 .rpc_resp = &data->c_res,
1322                 .rpc_cred = data->owner->so_cred,
1323         };
1324         struct rpc_task_setup task_setup_data = {
1325                 .rpc_client = server->client,
1326                 .rpc_message = &msg,
1327                 .callback_ops = &nfs4_open_confirm_ops,
1328                 .callback_data = data,
1329                 .workqueue = nfsiod_workqueue,
1330                 .flags = RPC_TASK_ASYNC,
1331         };
1332         int status;
1333
1334         kref_get(&data->kref);
1335         data->rpc_done = 0;
1336         data->rpc_status = 0;
1337         data->timestamp = jiffies;
1338         task = rpc_run_task(&task_setup_data);
1339         if (IS_ERR(task))
1340                 return PTR_ERR(task);
1341         status = nfs4_wait_for_completion_rpc_task(task);
1342         if (status != 0) {
1343                 data->cancelled = 1;
1344                 smp_wmb();
1345         } else
1346                 status = data->rpc_status;
1347         rpc_put_task(task);
1348         return status;
1349 }
1350
1351 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1352 {
1353         struct nfs4_opendata *data = calldata;
1354         struct nfs4_state_owner *sp = data->owner;
1355
1356         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1357                 return;
1358         /*
1359          * Check if we still need to send an OPEN call, or if we can use
1360          * a delegation instead.
1361          */
1362         if (data->state != NULL) {
1363                 struct nfs_delegation *delegation;
1364
1365                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1366                         goto out_no_action;
1367                 rcu_read_lock();
1368                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1369                 if (delegation != NULL &&
1370                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1371                         rcu_read_unlock();
1372                         goto out_no_action;
1373                 }
1374                 rcu_read_unlock();
1375         }
1376         /* Update sequence id. */
1377         data->o_arg.id = sp->so_owner_id.id;
1378         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1379         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1380                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1381                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1382         }
1383         data->timestamp = jiffies;
1384         if (nfs4_setup_sequence(data->o_arg.server,
1385                                 &data->o_arg.seq_args,
1386                                 &data->o_res.seq_res, 1, task))
1387                 return;
1388         rpc_call_start(task);
1389         return;
1390 out_no_action:
1391         task->tk_action = NULL;
1392
1393 }
1394
1395 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1396 {
1397         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1398         nfs4_open_prepare(task, calldata);
1399 }
1400
1401 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1402 {
1403         struct nfs4_opendata *data = calldata;
1404
1405         data->rpc_status = task->tk_status;
1406
1407         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1408                 return;
1409
1410         if (RPC_ASSASSINATED(task))
1411                 return;
1412         if (task->tk_status == 0) {
1413                 switch (data->o_res.f_attr->mode & S_IFMT) {
1414                         case S_IFREG:
1415                                 break;
1416                         case S_IFLNK:
1417                                 data->rpc_status = -ELOOP;
1418                                 break;
1419                         case S_IFDIR:
1420                                 data->rpc_status = -EISDIR;
1421                                 break;
1422                         default:
1423                                 data->rpc_status = -ENOTDIR;
1424                 }
1425                 renew_lease(data->o_res.server, data->timestamp);
1426                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1427                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1428         }
1429         data->rpc_done = 1;
1430 }
1431
1432 static void nfs4_open_release(void *calldata)
1433 {
1434         struct nfs4_opendata *data = calldata;
1435         struct nfs4_state *state = NULL;
1436
1437         /* If this request hasn't been cancelled, do nothing */
1438         if (data->cancelled == 0)
1439                 goto out_free;
1440         /* In case of error, no cleanup! */
1441         if (data->rpc_status != 0 || !data->rpc_done)
1442                 goto out_free;
1443         /* In case we need an open_confirm, no cleanup! */
1444         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1445                 goto out_free;
1446         state = nfs4_opendata_to_nfs4_state(data);
1447         if (!IS_ERR(state))
1448                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1449 out_free:
1450         nfs4_opendata_put(data);
1451 }
1452
1453 static const struct rpc_call_ops nfs4_open_ops = {
1454         .rpc_call_prepare = nfs4_open_prepare,
1455         .rpc_call_done = nfs4_open_done,
1456         .rpc_release = nfs4_open_release,
1457 };
1458
1459 static const struct rpc_call_ops nfs4_recover_open_ops = {
1460         .rpc_call_prepare = nfs4_recover_open_prepare,
1461         .rpc_call_done = nfs4_open_done,
1462         .rpc_release = nfs4_open_release,
1463 };
1464
1465 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1466 {
1467         struct inode *dir = data->dir->d_inode;
1468         struct nfs_server *server = NFS_SERVER(dir);
1469         struct nfs_openargs *o_arg = &data->o_arg;
1470         struct nfs_openres *o_res = &data->o_res;
1471         struct rpc_task *task;
1472         struct rpc_message msg = {
1473                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1474                 .rpc_argp = o_arg,
1475                 .rpc_resp = o_res,
1476                 .rpc_cred = data->owner->so_cred,
1477         };
1478         struct rpc_task_setup task_setup_data = {
1479                 .rpc_client = server->client,
1480                 .rpc_message = &msg,
1481                 .callback_ops = &nfs4_open_ops,
1482                 .callback_data = data,
1483                 .workqueue = nfsiod_workqueue,
1484                 .flags = RPC_TASK_ASYNC,
1485         };
1486         int status;
1487
1488         kref_get(&data->kref);
1489         data->rpc_done = 0;
1490         data->rpc_status = 0;
1491         data->cancelled = 0;
1492         if (isrecover)
1493                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1494         task = rpc_run_task(&task_setup_data);
1495         if (IS_ERR(task))
1496                 return PTR_ERR(task);
1497         status = nfs4_wait_for_completion_rpc_task(task);
1498         if (status != 0) {
1499                 data->cancelled = 1;
1500                 smp_wmb();
1501         } else
1502                 status = data->rpc_status;
1503         rpc_put_task(task);
1504
1505         return status;
1506 }
1507
1508 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1509 {
1510         struct inode *dir = data->dir->d_inode;
1511         struct nfs_openres *o_res = &data->o_res;
1512         int status;
1513
1514         status = nfs4_run_open_task(data, 1);
1515         if (status != 0 || !data->rpc_done)
1516                 return status;
1517
1518         nfs_refresh_inode(dir, o_res->dir_attr);
1519
1520         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1521                 status = _nfs4_proc_open_confirm(data);
1522                 if (status != 0)
1523                         return status;
1524         }
1525
1526         return status;
1527 }
1528
1529 /*
1530  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1531  */
1532 static int _nfs4_proc_open(struct nfs4_opendata *data)
1533 {
1534         struct inode *dir = data->dir->d_inode;
1535         struct nfs_server *server = NFS_SERVER(dir);
1536         struct nfs_openargs *o_arg = &data->o_arg;
1537         struct nfs_openres *o_res = &data->o_res;
1538         int status;
1539
1540         status = nfs4_run_open_task(data, 0);
1541         if (status != 0 || !data->rpc_done)
1542                 return status;
1543
1544         if (o_arg->open_flags & O_CREAT) {
1545                 update_changeattr(dir, &o_res->cinfo);
1546                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1547         } else
1548                 nfs_refresh_inode(dir, o_res->dir_attr);
1549         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1550                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1551         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1552                 status = _nfs4_proc_open_confirm(data);
1553                 if (status != 0)
1554                         return status;
1555         }
1556         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1557                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1558         return 0;
1559 }
1560
1561 static int nfs4_recover_expired_lease(struct nfs_server *server)
1562 {
1563         struct nfs_client *clp = server->nfs_client;
1564         unsigned int loop;
1565         int ret;
1566
1567         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1568                 ret = nfs4_wait_clnt_recover(clp);
1569                 if (ret != 0)
1570                         break;
1571                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1572                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1573                         break;
1574                 nfs4_schedule_state_recovery(clp);
1575                 ret = -EIO;
1576         }
1577         return ret;
1578 }
1579
1580 /*
1581  * OPEN_EXPIRED:
1582  *      reclaim state on the server after a network partition.
1583  *      Assumes caller holds the appropriate lock
1584  */
1585 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1586 {
1587         struct nfs4_opendata *opendata;
1588         int ret;
1589
1590         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1591         if (IS_ERR(opendata))
1592                 return PTR_ERR(opendata);
1593         ret = nfs4_open_recover(opendata, state);
1594         if (ret == -ESTALE)
1595                 d_drop(ctx->path.dentry);
1596         nfs4_opendata_put(opendata);
1597         return ret;
1598 }
1599
1600 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1601 {
1602         struct nfs_server *server = NFS_SERVER(state->inode);
1603         struct nfs4_exception exception = { };
1604         int err;
1605
1606         do {
1607                 err = _nfs4_open_expired(ctx, state);
1608                 switch (err) {
1609                 default:
1610                         goto out;
1611                 case -NFS4ERR_GRACE:
1612                 case -NFS4ERR_DELAY:
1613                 case -EKEYEXPIRED:
1614                         nfs4_handle_exception(server, err, &exception);
1615                         err = 0;
1616                 }
1617         } while (exception.retry);
1618 out:
1619         return err;
1620 }
1621
1622 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1623 {
1624         struct nfs_open_context *ctx;
1625         int ret;
1626
1627         ctx = nfs4_state_find_open_context(state);
1628         if (IS_ERR(ctx))
1629                 return PTR_ERR(ctx);
1630         ret = nfs4_do_open_expired(ctx, state);
1631         put_nfs_open_context(ctx);
1632         return ret;
1633 }
1634
1635 /*
1636  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1637  * fields corresponding to attributes that were used to store the verifier.
1638  * Make sure we clobber those fields in the later setattr call
1639  */
1640 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1641 {
1642         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1643             !(sattr->ia_valid & ATTR_ATIME_SET))
1644                 sattr->ia_valid |= ATTR_ATIME;
1645
1646         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1647             !(sattr->ia_valid & ATTR_MTIME_SET))
1648                 sattr->ia_valid |= ATTR_MTIME;
1649 }
1650
1651 /*
1652  * Returns a referenced nfs4_state
1653  */
1654 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)
1655 {
1656         struct nfs4_state_owner  *sp;
1657         struct nfs4_state     *state = NULL;
1658         struct nfs_server       *server = NFS_SERVER(dir);
1659         struct nfs4_opendata *opendata;
1660         int status;
1661
1662         /* Protect against reboot recovery conflicts */
1663         status = -ENOMEM;
1664         if (!(sp = nfs4_get_state_owner(server, cred))) {
1665                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1666                 goto out_err;
1667         }
1668         status = nfs4_recover_expired_lease(server);
1669         if (status != 0)
1670                 goto err_put_state_owner;
1671         if (path->dentry->d_inode != NULL)
1672                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1673         status = -ENOMEM;
1674         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr, GFP_KERNEL);
1675         if (opendata == NULL)
1676                 goto err_put_state_owner;
1677
1678         if (path->dentry->d_inode != NULL)
1679                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1680
1681         status = _nfs4_proc_open(opendata);
1682         if (status != 0)
1683                 goto err_opendata_put;
1684
1685         state = nfs4_opendata_to_nfs4_state(opendata);
1686         status = PTR_ERR(state);
1687         if (IS_ERR(state))
1688                 goto err_opendata_put;
1689         if (server->caps & NFS_CAP_POSIX_LOCK)
1690                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1691
1692         if (opendata->o_arg.open_flags & O_EXCL) {
1693                 nfs4_exclusive_attrset(opendata, sattr);
1694
1695                 nfs_fattr_init(opendata->o_res.f_attr);
1696                 status = nfs4_do_setattr(state->inode, cred,
1697                                 opendata->o_res.f_attr, sattr,
1698                                 state);
1699                 if (status == 0)
1700                         nfs_setattr_update_inode(state->inode, sattr);
1701                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1702         }
1703         nfs4_opendata_put(opendata);
1704         nfs4_put_state_owner(sp);
1705         *res = state;
1706         return 0;
1707 err_opendata_put:
1708         nfs4_opendata_put(opendata);
1709 err_put_state_owner:
1710         nfs4_put_state_owner(sp);
1711 out_err:
1712         *res = NULL;
1713         return status;
1714 }
1715
1716
1717 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)
1718 {
1719         struct nfs4_exception exception = { };
1720         struct nfs4_state *res;
1721         int status;
1722
1723         do {
1724                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1725                 if (status == 0)
1726                         break;
1727                 /* NOTE: BAD_SEQID means the server and client disagree about the
1728                  * book-keeping w.r.t. state-changing operations
1729                  * (OPEN/CLOSE/LOCK/LOCKU...)
1730                  * It is actually a sign of a bug on the client or on the server.
1731                  *
1732                  * If we receive a BAD_SEQID error in the particular case of
1733                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1734                  * have unhashed the old state_owner for us, and that we can
1735                  * therefore safely retry using a new one. We should still warn
1736                  * the user though...
1737                  */
1738                 if (status == -NFS4ERR_BAD_SEQID) {
1739                         printk(KERN_WARNING "NFS: v4 server %s "
1740                                         " returned a bad sequence-id error!\n",
1741                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1742                         exception.retry = 1;
1743                         continue;
1744                 }
1745                 /*
1746                  * BAD_STATEID on OPEN means that the server cancelled our
1747                  * state before it received the OPEN_CONFIRM.
1748                  * Recover by retrying the request as per the discussion
1749                  * on Page 181 of RFC3530.
1750                  */
1751                 if (status == -NFS4ERR_BAD_STATEID) {
1752                         exception.retry = 1;
1753                         continue;
1754                 }
1755                 if (status == -EAGAIN) {
1756                         /* We must have found a delegation */
1757                         exception.retry = 1;
1758                         continue;
1759                 }
1760                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1761                                         status, &exception));
1762         } while (exception.retry);
1763         return res;
1764 }
1765
1766 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1767                             struct nfs_fattr *fattr, struct iattr *sattr,
1768                             struct nfs4_state *state)
1769 {
1770         struct nfs_server *server = NFS_SERVER(inode);
1771         struct nfs_setattrargs  arg = {
1772                 .fh             = NFS_FH(inode),
1773                 .iap            = sattr,
1774                 .server         = server,
1775                 .bitmask = server->attr_bitmask,
1776         };
1777         struct nfs_setattrres  res = {
1778                 .fattr          = fattr,
1779                 .server         = server,
1780         };
1781         struct rpc_message msg = {
1782                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1783                 .rpc_argp       = &arg,
1784                 .rpc_resp       = &res,
1785                 .rpc_cred       = cred,
1786         };
1787         unsigned long timestamp = jiffies;
1788         int status;
1789
1790         nfs_fattr_init(fattr);
1791
1792         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1793                 /* Use that stateid */
1794         } else if (state != NULL) {
1795                 nfs4_copy_stateid(&arg.stateid, state, current->files, current->tgid);
1796         } else
1797                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1798
1799         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1800         if (status == 0 && state != NULL)
1801                 renew_lease(server, timestamp);
1802         return status;
1803 }
1804
1805 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1806                            struct nfs_fattr *fattr, struct iattr *sattr,
1807                            struct nfs4_state *state)
1808 {
1809         struct nfs_server *server = NFS_SERVER(inode);
1810         struct nfs4_exception exception = { };
1811         int err;
1812         do {
1813                 err = nfs4_handle_exception(server,
1814                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1815                                 &exception);
1816         } while (exception.retry);
1817         return err;
1818 }
1819
1820 struct nfs4_closedata {
1821         struct path path;
1822         struct inode *inode;
1823         struct nfs4_state *state;
1824         struct nfs_closeargs arg;
1825         struct nfs_closeres res;
1826         struct nfs_fattr fattr;
1827         unsigned long timestamp;
1828 };
1829
1830 static void nfs4_free_closedata(void *data)
1831 {
1832         struct nfs4_closedata *calldata = data;
1833         struct nfs4_state_owner *sp = calldata->state->owner;
1834
1835         nfs4_put_open_state(calldata->state);
1836         nfs_free_seqid(calldata->arg.seqid);
1837         nfs4_put_state_owner(sp);
1838         path_put(&calldata->path);
1839         kfree(calldata);
1840 }
1841
1842 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
1843                 fmode_t fmode)
1844 {
1845         spin_lock(&state->owner->so_lock);
1846         if (!(fmode & FMODE_READ))
1847                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1848         if (!(fmode & FMODE_WRITE))
1849                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1850         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1851         spin_unlock(&state->owner->so_lock);
1852 }
1853
1854 static void nfs4_close_done(struct rpc_task *task, void *data)
1855 {
1856         struct nfs4_closedata *calldata = data;
1857         struct nfs4_state *state = calldata->state;
1858         struct nfs_server *server = NFS_SERVER(calldata->inode);
1859
1860         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
1861                 return;
1862         if (RPC_ASSASSINATED(task))
1863                 return;
1864         /* hmm. we are done with the inode, and in the process of freeing
1865          * the state_owner. we keep this around to process errors
1866          */
1867         switch (task->tk_status) {
1868                 case 0:
1869                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1870                         renew_lease(server, calldata->timestamp);
1871                         nfs4_close_clear_stateid_flags(state,
1872                                         calldata->arg.fmode);
1873                         break;
1874                 case -NFS4ERR_STALE_STATEID:
1875                 case -NFS4ERR_OLD_STATEID:
1876                 case -NFS4ERR_BAD_STATEID:
1877                 case -NFS4ERR_EXPIRED:
1878                         if (calldata->arg.fmode == 0)
1879                                 break;
1880                 default:
1881                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
1882                                 rpc_restart_call_prepare(task);
1883         }
1884         nfs_release_seqid(calldata->arg.seqid);
1885         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1886 }
1887
1888 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1889 {
1890         struct nfs4_closedata *calldata = data;
1891         struct nfs4_state *state = calldata->state;
1892         int call_close = 0;
1893
1894         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1895                 return;
1896
1897         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1898         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
1899         spin_lock(&state->owner->so_lock);
1900         /* Calculate the change in open mode */
1901         if (state->n_rdwr == 0) {
1902                 if (state->n_rdonly == 0) {
1903                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
1904                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1905                         calldata->arg.fmode &= ~FMODE_READ;
1906                 }
1907                 if (state->n_wronly == 0) {
1908                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
1909                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
1910                         calldata->arg.fmode &= ~FMODE_WRITE;
1911                 }
1912         }
1913         spin_unlock(&state->owner->so_lock);
1914
1915         if (!call_close) {
1916                 /* Note: exit _without_ calling nfs4_close_done */
1917                 task->tk_action = NULL;
1918                 return;
1919         }
1920
1921         if (calldata->arg.fmode == 0)
1922                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
1923
1924         nfs_fattr_init(calldata->res.fattr);
1925         calldata->timestamp = jiffies;
1926         if (nfs4_setup_sequence(NFS_SERVER(calldata->inode),
1927                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1928                                 1, task))
1929                 return;
1930         rpc_call_start(task);
1931 }
1932
1933 static const struct rpc_call_ops nfs4_close_ops = {
1934         .rpc_call_prepare = nfs4_close_prepare,
1935         .rpc_call_done = nfs4_close_done,
1936         .rpc_release = nfs4_free_closedata,
1937 };
1938
1939 /*
1940  * It is possible for data to be read/written from a mem-mapped file
1941  * after the sys_close call (which hits the vfs layer as a flush).
1942  * This means that we can't safely call nfsv4 close on a file until
1943  * the inode is cleared. This in turn means that we are not good
1944  * NFSv4 citizens - we do not indicate to the server to update the file's
1945  * share state even when we are done with one of the three share
1946  * stateid's in the inode.
1947  *
1948  * NOTE: Caller must be holding the sp->so_owner semaphore!
1949  */
1950 int nfs4_do_close(struct path *path, struct nfs4_state *state, gfp_t gfp_mask, int wait)
1951 {
1952         struct nfs_server *server = NFS_SERVER(state->inode);
1953         struct nfs4_closedata *calldata;
1954         struct nfs4_state_owner *sp = state->owner;
1955         struct rpc_task *task;
1956         struct rpc_message msg = {
1957                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1958                 .rpc_cred = state->owner->so_cred,
1959         };
1960         struct rpc_task_setup task_setup_data = {
1961                 .rpc_client = server->client,
1962                 .rpc_message = &msg,
1963                 .callback_ops = &nfs4_close_ops,
1964                 .workqueue = nfsiod_workqueue,
1965                 .flags = RPC_TASK_ASYNC,
1966         };
1967         int status = -ENOMEM;
1968
1969         calldata = kzalloc(sizeof(*calldata), gfp_mask);
1970         if (calldata == NULL)
1971                 goto out;
1972         calldata->inode = state->inode;
1973         calldata->state = state;
1974         calldata->arg.fh = NFS_FH(state->inode);
1975         calldata->arg.stateid = &state->open_stateid;
1976         /* Serialization for the sequence id */
1977         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
1978         if (calldata->arg.seqid == NULL)
1979                 goto out_free_calldata;
1980         calldata->arg.fmode = 0;
1981         calldata->arg.bitmask = server->cache_consistency_bitmask;
1982         calldata->res.fattr = &calldata->fattr;
1983         calldata->res.seqid = calldata->arg.seqid;
1984         calldata->res.server = server;
1985         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1986         path_get(path);
1987         calldata->path = *path;
1988
1989         msg.rpc_argp = &calldata->arg,
1990         msg.rpc_resp = &calldata->res,
1991         task_setup_data.callback_data = calldata;
1992         task = rpc_run_task(&task_setup_data);
1993         if (IS_ERR(task))
1994                 return PTR_ERR(task);
1995         status = 0;
1996         if (wait)
1997                 status = rpc_wait_for_completion_task(task);
1998         rpc_put_task(task);
1999         return status;
2000 out_free_calldata:
2001         kfree(calldata);
2002 out:
2003         nfs4_put_open_state(state);
2004         nfs4_put_state_owner(sp);
2005         return status;
2006 }
2007
2008 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
2009 {
2010         struct file *filp;
2011         int ret;
2012
2013         /* If the open_intent is for execute, we have an extra check to make */
2014         if (fmode & FMODE_EXEC) {
2015                 ret = nfs_may_open(state->inode,
2016                                 state->owner->so_cred,
2017                                 nd->intent.open.flags);
2018                 if (ret < 0)
2019                         goto out_close;
2020         }
2021         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
2022         if (!IS_ERR(filp)) {
2023                 struct nfs_open_context *ctx;
2024                 ctx = nfs_file_open_context(filp);
2025                 ctx->state = state;
2026                 return 0;
2027         }
2028         ret = PTR_ERR(filp);
2029 out_close:
2030         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
2031         return ret;
2032 }
2033
2034 struct dentry *
2035 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
2036 {
2037         struct path path = {
2038                 .mnt = nd->path.mnt,
2039                 .dentry = dentry,
2040         };
2041         struct dentry *parent;
2042         struct iattr attr;
2043         struct rpc_cred *cred;
2044         struct nfs4_state *state;
2045         struct dentry *res;
2046         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
2047
2048         if (nd->flags & LOOKUP_CREATE) {
2049                 attr.ia_mode = nd->intent.open.create_mode;
2050                 attr.ia_valid = ATTR_MODE;
2051                 if (!IS_POSIXACL(dir))
2052                         attr.ia_mode &= ~current_umask();
2053         } else {
2054                 attr.ia_valid = 0;
2055                 BUG_ON(nd->intent.open.flags & O_CREAT);
2056         }
2057
2058         cred = rpc_lookup_cred();
2059         if (IS_ERR(cred))
2060                 return (struct dentry *)cred;
2061         parent = dentry->d_parent;
2062         /* Protect against concurrent sillydeletes */
2063         nfs_block_sillyrename(parent);
2064         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
2065         put_rpccred(cred);
2066         if (IS_ERR(state)) {
2067                 if (PTR_ERR(state) == -ENOENT) {
2068                         d_add(dentry, NULL);
2069                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2070                 }
2071                 nfs_unblock_sillyrename(parent);
2072                 return (struct dentry *)state;
2073         }
2074         res = d_add_unique(dentry, igrab(state->inode));
2075         if (res != NULL)
2076                 path.dentry = res;
2077         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
2078         nfs_unblock_sillyrename(parent);
2079         nfs4_intent_set_file(nd, &path, state, fmode);
2080         return res;
2081 }
2082
2083 int
2084 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
2085 {
2086         struct path path = {
2087                 .mnt = nd->path.mnt,
2088                 .dentry = dentry,
2089         };
2090         struct rpc_cred *cred;
2091         struct nfs4_state *state;
2092         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
2093
2094         cred = rpc_lookup_cred();
2095         if (IS_ERR(cred))
2096                 return PTR_ERR(cred);
2097         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
2098         put_rpccred(cred);
2099         if (IS_ERR(state)) {
2100                 switch (PTR_ERR(state)) {
2101                         case -EPERM:
2102                         case -EACCES:
2103                         case -EDQUOT:
2104                         case -ENOSPC:
2105                         case -EROFS:
2106                                 return PTR_ERR(state);
2107                         default:
2108                                 goto out_drop;
2109                 }
2110         }
2111         if (state->inode == dentry->d_inode) {
2112                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2113                 nfs4_intent_set_file(nd, &path, state, fmode);
2114                 return 1;
2115         }
2116         nfs4_close_sync(&path, state, fmode);
2117 out_drop:
2118         d_drop(dentry);
2119         return 0;
2120 }
2121
2122 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2123 {
2124         if (ctx->state == NULL)
2125                 return;
2126         if (is_sync)
2127                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2128         else
2129                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2130 }
2131
2132 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2133 {
2134         struct nfs4_server_caps_arg args = {
2135                 .fhandle = fhandle,
2136         };
2137         struct nfs4_server_caps_res res = {};
2138         struct rpc_message msg = {
2139                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2140                 .rpc_argp = &args,
2141                 .rpc_resp = &res,
2142         };
2143         int status;
2144
2145         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2146         if (status == 0) {
2147                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2148                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2149                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2150                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2151                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2152                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2153                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2154                         server->caps |= NFS_CAP_ACLS;
2155                 if (res.has_links != 0)
2156                         server->caps |= NFS_CAP_HARDLINKS;
2157                 if (res.has_symlinks != 0)
2158                         server->caps |= NFS_CAP_SYMLINKS;
2159                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2160                         server->caps |= NFS_CAP_FILEID;
2161                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2162                         server->caps |= NFS_CAP_MODE;
2163                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2164                         server->caps |= NFS_CAP_NLINK;
2165                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2166                         server->caps |= NFS_CAP_OWNER;
2167                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2168                         server->caps |= NFS_CAP_OWNER_GROUP;
2169                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2170                         server->caps |= NFS_CAP_ATIME;
2171                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2172                         server->caps |= NFS_CAP_CTIME;
2173                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2174                         server->caps |= NFS_CAP_MTIME;
2175
2176                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2177                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2178                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2179                 server->acl_bitmask = res.acl_bitmask;
2180         }
2181
2182         return status;
2183 }
2184
2185 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2186 {
2187         struct nfs4_exception exception = { };
2188         int err;
2189         do {
2190                 err = nfs4_handle_exception(server,
2191                                 _nfs4_server_capabilities(server, fhandle),
2192                                 &exception);
2193         } while (exception.retry);
2194         return err;
2195 }
2196
2197 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2198                 struct nfs_fsinfo *info)
2199 {
2200         struct nfs4_lookup_root_arg args = {
2201                 .bitmask = nfs4_fattr_bitmap,
2202         };
2203         struct nfs4_lookup_res res = {
2204                 .server = server,
2205                 .fattr = info->fattr,
2206                 .fh = fhandle,
2207         };
2208         struct rpc_message msg = {
2209                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2210                 .rpc_argp = &args,
2211                 .rpc_resp = &res,
2212         };
2213
2214         nfs_fattr_init(info->fattr);
2215         return nfs4_call_sync(server, &msg, &args, &res, 0);
2216 }
2217
2218 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2219                 struct nfs_fsinfo *info)
2220 {
2221         struct nfs4_exception exception = { };
2222         int err;
2223         do {
2224                 err = nfs4_handle_exception(server,
2225                                 _nfs4_lookup_root(server, fhandle, info),
2226                                 &exception);
2227         } while (exception.retry);
2228         return err;
2229 }
2230
2231 /*
2232  * get the file handle for the "/" directory on the server
2233  */
2234 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2235                               struct nfs_fsinfo *info)
2236 {
2237         int status;
2238
2239         status = nfs4_lookup_root(server, fhandle, info);
2240         if (status == 0)
2241                 status = nfs4_server_capabilities(server, fhandle);
2242         if (status == 0)
2243                 status = nfs4_do_fsinfo(server, fhandle, info);
2244         return nfs4_map_errors(status);
2245 }
2246
2247 /*
2248  * Get locations and (maybe) other attributes of a referral.
2249  * Note that we'll actually follow the referral later when
2250  * we detect fsid mismatch in inode revalidation
2251  */
2252 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2253 {
2254         int status = -ENOMEM;
2255         struct page *page = NULL;
2256         struct nfs4_fs_locations *locations = NULL;
2257
2258         page = alloc_page(GFP_KERNEL);
2259         if (page == NULL)
2260                 goto out;
2261         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2262         if (locations == NULL)
2263                 goto out;
2264
2265         status = nfs4_proc_fs_locations(dir, name, locations, page);
2266         if (status != 0)
2267                 goto out;
2268         /* Make sure server returned a different fsid for the referral */
2269         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2270                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2271                 status = -EIO;
2272                 goto out;
2273         }
2274
2275         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2276         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2277         if (!fattr->mode)
2278                 fattr->mode = S_IFDIR;
2279         memset(fhandle, 0, sizeof(struct nfs_fh));
2280 out:
2281         if (page)
2282                 __free_page(page);
2283         if (locations)
2284                 kfree(locations);
2285         return status;
2286 }
2287
2288 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2289 {
2290         struct nfs4_getattr_arg args = {
2291                 .fh = fhandle,
2292                 .bitmask = server->attr_bitmask,
2293         };
2294         struct nfs4_getattr_res res = {
2295                 .fattr = fattr,
2296                 .server = server,
2297         };
2298         struct rpc_message msg = {
2299                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2300                 .rpc_argp = &args,
2301                 .rpc_resp = &res,
2302         };
2303
2304         nfs_fattr_init(fattr);
2305         return nfs4_call_sync(server, &msg, &args, &res, 0);
2306 }
2307
2308 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2309 {
2310         struct nfs4_exception exception = { };
2311         int err;
2312         do {
2313                 err = nfs4_handle_exception(server,
2314                                 _nfs4_proc_getattr(server, fhandle, fattr),
2315                                 &exception);
2316         } while (exception.retry);
2317         return err;
2318 }
2319
2320 /*
2321  * The file is not closed if it is opened due to the a request to change
2322  * the size of the file. The open call will not be needed once the
2323  * VFS layer lookup-intents are implemented.
2324  *
2325  * Close is called when the inode is destroyed.
2326  * If we haven't opened the file for O_WRONLY, we
2327  * need to in the size_change case to obtain a stateid.
2328  *
2329  * Got race?
2330  * Because OPEN is always done by name in nfsv4, it is
2331  * possible that we opened a different file by the same
2332  * name.  We can recognize this race condition, but we
2333  * can't do anything about it besides returning an error.
2334  *
2335  * This will be fixed with VFS changes (lookup-intent).
2336  */
2337 static int
2338 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2339                   struct iattr *sattr)
2340 {
2341         struct inode *inode = dentry->d_inode;
2342         struct rpc_cred *cred = NULL;
2343         struct nfs4_state *state = NULL;
2344         int status;
2345
2346         nfs_fattr_init(fattr);
2347
2348         /* Search for an existing open(O_WRITE) file */
2349         if (sattr->ia_valid & ATTR_FILE) {
2350                 struct nfs_open_context *ctx;
2351
2352                 ctx = nfs_file_open_context(sattr->ia_file);
2353                 if (ctx) {
2354                         cred = ctx->cred;
2355                         state = ctx->state;
2356                 }
2357         }
2358
2359         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2360         if (status == 0)
2361                 nfs_setattr_update_inode(inode, sattr);
2362         return status;
2363 }
2364
2365 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2366                 const struct qstr *name, struct nfs_fh *fhandle,
2367                 struct nfs_fattr *fattr)
2368 {
2369         int                    status;
2370         struct nfs4_lookup_arg args = {
2371                 .bitmask = server->attr_bitmask,
2372                 .dir_fh = dirfh,
2373                 .name = name,
2374         };
2375         struct nfs4_lookup_res res = {
2376                 .server = server,
2377                 .fattr = fattr,
2378                 .fh = fhandle,
2379         };
2380         struct rpc_message msg = {
2381                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2382                 .rpc_argp = &args,
2383                 .rpc_resp = &res,
2384         };
2385
2386         nfs_fattr_init(fattr);
2387
2388         dprintk("NFS call  lookupfh %s\n", name->name);
2389         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2390         dprintk("NFS reply lookupfh: %d\n", status);
2391         return status;
2392 }
2393
2394 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2395                               struct qstr *name, struct nfs_fh *fhandle,
2396                               struct nfs_fattr *fattr)
2397 {
2398         struct nfs4_exception exception = { };
2399         int err;
2400         do {
2401                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2402                 /* FIXME: !!!! */
2403                 if (err == -NFS4ERR_MOVED) {
2404                         err = -EREMOTE;
2405                         break;
2406                 }
2407                 err = nfs4_handle_exception(server, err, &exception);
2408         } while (exception.retry);
2409         return err;
2410 }
2411
2412 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2413                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2414 {
2415         int status;
2416
2417         dprintk("NFS call  lookup %s\n", name->name);
2418         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2419         if (status == -NFS4ERR_MOVED)
2420                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2421         dprintk("NFS reply lookup: %d\n", status);
2422         return status;
2423 }
2424
2425 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2426 {
2427         struct nfs4_exception exception = { };
2428         int err;
2429         do {
2430                 err = nfs4_handle_exception(NFS_SERVER(dir),
2431                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2432                                 &exception);
2433         } while (exception.retry);
2434         return err;
2435 }
2436
2437 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2438 {
2439         struct nfs_server *server = NFS_SERVER(inode);
2440         struct nfs4_accessargs args = {
2441                 .fh = NFS_FH(inode),
2442                 .bitmask = server->attr_bitmask,
2443         };
2444         struct nfs4_accessres res = {
2445                 .server = server,
2446         };
2447         struct rpc_message msg = {
2448                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2449                 .rpc_argp = &args,
2450                 .rpc_resp = &res,
2451                 .rpc_cred = entry->cred,
2452         };
2453         int mode = entry->mask;
2454         int status;
2455
2456         /*
2457          * Determine which access bits we want to ask for...
2458          */
2459         if (mode & MAY_READ)
2460                 args.access |= NFS4_ACCESS_READ;
2461         if (S_ISDIR(inode->i_mode)) {
2462                 if (mode & MAY_WRITE)
2463                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2464                 if (mode & MAY_EXEC)
2465                         args.access |= NFS4_ACCESS_LOOKUP;
2466         } else {
2467                 if (mode & MAY_WRITE)
2468                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2469                 if (mode & MAY_EXEC)
2470                         args.access |= NFS4_ACCESS_EXECUTE;
2471         }
2472
2473         res.fattr = nfs_alloc_fattr();
2474         if (res.fattr == NULL)
2475                 return -ENOMEM;
2476
2477         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2478         if (!status) {
2479                 entry->mask = 0;
2480                 if (res.access & NFS4_ACCESS_READ)
2481                         entry->mask |= MAY_READ;
2482                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2483                         entry->mask |= MAY_WRITE;
2484                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2485                         entry->mask |= MAY_EXEC;
2486                 nfs_refresh_inode(inode, res.fattr);
2487         }
2488         nfs_free_fattr(res.fattr);
2489         return status;
2490 }
2491
2492 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2493 {
2494         struct nfs4_exception exception = { };
2495         int err;
2496         do {
2497                 err = nfs4_handle_exception(NFS_SERVER(inode),
2498                                 _nfs4_proc_access(inode, entry),
2499                                 &exception);
2500         } while (exception.retry);
2501         return err;
2502 }
2503
2504 /*
2505  * TODO: For the time being, we don't try to get any attributes
2506  * along with any of the zero-copy operations READ, READDIR,
2507  * READLINK, WRITE.
2508  *
2509  * In the case of the first three, we want to put the GETATTR
2510  * after the read-type operation -- this is because it is hard
2511  * to predict the length of a GETATTR response in v4, and thus
2512  * align the READ data correctly.  This means that the GETATTR
2513  * may end up partially falling into the page cache, and we should
2514  * shift it into the 'tail' of the xdr_buf before processing.
2515  * To do this efficiently, we need to know the total length
2516  * of data received, which doesn't seem to be available outside
2517  * of the RPC layer.
2518  *
2519  * In the case of WRITE, we also want to put the GETATTR after
2520  * the operation -- in this case because we want to make sure
2521  * we get the post-operation mtime and size.  This means that
2522  * we can't use xdr_encode_pages() as written: we need a variant
2523  * of it which would leave room in the 'tail' iovec.
2524  *
2525  * Both of these changes to the XDR layer would in fact be quite
2526  * minor, but I decided to leave them for a subsequent patch.
2527  */
2528 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2529                 unsigned int pgbase, unsigned int pglen)
2530 {
2531         struct nfs4_readlink args = {
2532                 .fh       = NFS_FH(inode),
2533                 .pgbase   = pgbase,
2534                 .pglen    = pglen,
2535                 .pages    = &page,
2536         };
2537         struct nfs4_readlink_res res;
2538         struct rpc_message msg = {
2539                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2540                 .rpc_argp = &args,
2541                 .rpc_resp = &res,
2542         };
2543
2544         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2545 }
2546
2547 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2548                 unsigned int pgbase, unsigned int pglen)
2549 {
2550         struct nfs4_exception exception = { };
2551         int err;
2552         do {
2553                 err = nfs4_handle_exception(NFS_SERVER(inode),
2554                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2555                                 &exception);
2556         } while (exception.retry);
2557         return err;
2558 }
2559
2560 /*
2561  * Got race?
2562  * We will need to arrange for the VFS layer to provide an atomic open.
2563  * Until then, this create/open method is prone to inefficiency and race
2564  * conditions due to the lookup, create, and open VFS calls from sys_open()
2565  * placed on the wire.
2566  *
2567  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2568  * The file will be opened again in the subsequent VFS open call
2569  * (nfs4_proc_file_open).
2570  *
2571  * The open for read will just hang around to be used by any process that
2572  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2573  */
2574
2575 static int
2576 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2577                  int flags, struct nameidata *nd)
2578 {
2579         struct path path = {
2580                 .mnt = nd->path.mnt,
2581                 .dentry = dentry,
2582         };
2583         struct nfs4_state *state;
2584         struct rpc_cred *cred;
2585         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2586         int status = 0;
2587
2588         cred = rpc_lookup_cred();
2589         if (IS_ERR(cred)) {
2590                 status = PTR_ERR(cred);
2591                 goto out;
2592         }
2593         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2594         d_drop(dentry);
2595         if (IS_ERR(state)) {
2596                 status = PTR_ERR(state);
2597                 goto out_putcred;
2598         }
2599         d_add(dentry, igrab(state->inode));
2600         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2601         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2602                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2603         else
2604                 nfs4_close_sync(&path, state, fmode);
2605 out_putcred:
2606         put_rpccred(cred);
2607 out:
2608         return status;
2609 }
2610
2611 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2612 {
2613         struct nfs_server *server = NFS_SERVER(dir);
2614         struct nfs_removeargs args = {
2615                 .fh = NFS_FH(dir),
2616                 .name.len = name->len,
2617                 .name.name = name->name,
2618                 .bitmask = server->attr_bitmask,
2619         };
2620         struct nfs_removeres res = {
2621                 .server = server,
2622         };
2623         struct rpc_message msg = {
2624                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2625                 .rpc_argp = &args,
2626                 .rpc_resp = &res,
2627         };
2628         int status = -ENOMEM;
2629
2630         res.dir_attr = nfs_alloc_fattr();
2631         if (res.dir_attr == NULL)
2632                 goto out;
2633
2634         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2635         if (status == 0) {
2636                 update_changeattr(dir, &res.cinfo);
2637                 nfs_post_op_update_inode(dir, res.dir_attr);
2638         }
2639         nfs_free_fattr(res.dir_attr);
2640 out:
2641         return status;
2642 }
2643
2644 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2645 {
2646         struct nfs4_exception exception = { };
2647         int err;
2648         do {
2649                 err = nfs4_handle_exception(NFS_SERVER(dir),
2650                                 _nfs4_proc_remove(dir, name),
2651                                 &exception);
2652         } while (exception.retry);
2653         return err;
2654 }
2655
2656 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2657 {
2658         struct nfs_server *server = NFS_SERVER(dir);
2659         struct nfs_removeargs *args = msg->rpc_argp;
2660         struct nfs_removeres *res = msg->rpc_resp;
2661
2662         args->bitmask = server->cache_consistency_bitmask;
2663         res->server = server;
2664         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2665 }
2666
2667 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2668 {
2669         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2670
2671         if (!nfs4_sequence_done(task, &res->seq_res))
2672                 return 0;
2673         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2674                 return 0;
2675         update_changeattr(dir, &res->cinfo);
2676         nfs_post_op_update_inode(dir, res->dir_attr);
2677         return 1;
2678 }
2679
2680 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2681                 struct inode *new_dir, struct qstr *new_name)
2682 {
2683         struct nfs_server *server = NFS_SERVER(old_dir);
2684         struct nfs4_rename_arg arg = {
2685                 .old_dir = NFS_FH(old_dir),
2686                 .new_dir = NFS_FH(new_dir),
2687                 .old_name = old_name,
2688                 .new_name = new_name,
2689                 .bitmask = server->attr_bitmask,
2690         };
2691         struct nfs4_rename_res res = {
2692                 .server = server,
2693         };
2694         struct rpc_message msg = {
2695                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2696                 .rpc_argp = &arg,
2697                 .rpc_resp = &res,
2698         };
2699         int status = -ENOMEM;
2700
2701         res.old_fattr = nfs_alloc_fattr();
2702         res.new_fattr = nfs_alloc_fattr();
2703         if (res.old_fattr == NULL || res.new_fattr == NULL)
2704                 goto out;
2705
2706         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2707         if (!status) {
2708                 update_changeattr(old_dir, &res.old_cinfo);
2709                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2710                 update_changeattr(new_dir, &res.new_cinfo);
2711                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2712         }
2713 out:
2714         nfs_free_fattr(res.new_fattr);
2715         nfs_free_fattr(res.old_fattr);
2716         return status;
2717 }
2718
2719 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2720                 struct inode *new_dir, struct qstr *new_name)
2721 {
2722         struct nfs4_exception exception = { };
2723         int err;
2724         do {
2725                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2726                                 _nfs4_proc_rename(old_dir, old_name,
2727                                         new_dir, new_name),
2728                                 &exception);
2729         } while (exception.retry);
2730         return err;
2731 }
2732
2733 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2734 {
2735         struct nfs_server *server = NFS_SERVER(inode);
2736         struct nfs4_link_arg arg = {
2737                 .fh     = NFS_FH(inode),
2738                 .dir_fh = NFS_FH(dir),
2739                 .name   = name,
2740                 .bitmask = server->attr_bitmask,
2741         };
2742         struct nfs4_link_res res = {
2743                 .server = server,
2744         };
2745         struct rpc_message msg = {
2746                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2747                 .rpc_argp = &arg,
2748                 .rpc_resp = &res,
2749         };
2750         int status = -ENOMEM;
2751
2752         res.fattr = nfs_alloc_fattr();
2753         res.dir_attr = nfs_alloc_fattr();
2754         if (res.fattr == NULL || res.dir_attr == NULL)
2755                 goto out;
2756
2757         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2758         if (!status) {
2759                 update_changeattr(dir, &res.cinfo);
2760                 nfs_post_op_update_inode(dir, res.dir_attr);
2761                 nfs_post_op_update_inode(inode, res.fattr);
2762         }
2763 out:
2764         nfs_free_fattr(res.dir_attr);
2765         nfs_free_fattr(res.fattr);
2766         return status;
2767 }
2768
2769 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2770 {
2771         struct nfs4_exception exception = { };
2772         int err;
2773         do {
2774                 err = nfs4_handle_exception(NFS_SERVER(inode),
2775                                 _nfs4_proc_link(inode, dir, name),
2776                                 &exception);
2777         } while (exception.retry);
2778         return err;
2779 }
2780
2781 struct nfs4_createdata {
2782         struct rpc_message msg;
2783         struct nfs4_create_arg arg;
2784         struct nfs4_create_res res;
2785         struct nfs_fh fh;
2786         struct nfs_fattr fattr;
2787         struct nfs_fattr dir_fattr;
2788 };
2789
2790 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2791                 struct qstr *name, struct iattr *sattr, u32 ftype)
2792 {
2793         struct nfs4_createdata *data;
2794
2795         data = kzalloc(sizeof(*data), GFP_KERNEL);
2796         if (data != NULL) {
2797                 struct nfs_server *server = NFS_SERVER(dir);
2798
2799                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2800                 data->msg.rpc_argp = &data->arg;
2801                 data->msg.rpc_resp = &data->res;
2802                 data->arg.dir_fh = NFS_FH(dir);
2803                 data->arg.server = server;
2804                 data->arg.name = name;
2805                 data->arg.attrs = sattr;
2806                 data->arg.ftype = ftype;
2807                 data->arg.bitmask = server->attr_bitmask;
2808                 data->res.server = server;
2809                 data->res.fh = &data->fh;
2810                 data->res.fattr = &data->fattr;
2811                 data->res.dir_fattr = &data->dir_fattr;
2812                 nfs_fattr_init(data->res.fattr);
2813                 nfs_fattr_init(data->res.dir_fattr);
2814         }
2815         return data;
2816 }
2817
2818 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2819 {
2820         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2821                                     &data->arg, &data->res, 1);
2822         if (status == 0) {
2823                 update_changeattr(dir, &data->res.dir_cinfo);
2824                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2825                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2826         }
2827         return status;
2828 }
2829
2830 static void nfs4_free_createdata(struct nfs4_createdata *data)
2831 {
2832         kfree(data);
2833 }
2834
2835 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2836                 struct page *page, unsigned int len, struct iattr *sattr)
2837 {
2838         struct nfs4_createdata *data;
2839         int status = -ENAMETOOLONG;
2840
2841         if (len > NFS4_MAXPATHLEN)
2842                 goto out;
2843
2844         status = -ENOMEM;
2845         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2846         if (data == NULL)
2847                 goto out;
2848
2849         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2850         data->arg.u.symlink.pages = &page;
2851         data->arg.u.symlink.len = len;
2852
2853         status = nfs4_do_create(dir, dentry, data);
2854
2855         nfs4_free_createdata(data);
2856 out:
2857         return status;
2858 }
2859
2860 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2861                 struct page *page, unsigned int len, struct iattr *sattr)
2862 {
2863         struct nfs4_exception exception = { };
2864         int err;
2865         do {
2866                 err = nfs4_handle_exception(NFS_SERVER(dir),
2867                                 _nfs4_proc_symlink(dir, dentry, page,
2868                                                         len, sattr),
2869                                 &exception);
2870         } while (exception.retry);
2871         return err;
2872 }
2873
2874 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2875                 struct iattr *sattr)
2876 {
2877         struct nfs4_createdata *data;
2878         int status = -ENOMEM;
2879
2880         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2881         if (data == NULL)
2882                 goto out;
2883
2884         status = nfs4_do_create(dir, dentry, data);
2885
2886         nfs4_free_createdata(data);
2887 out:
2888         return status;
2889 }
2890
2891 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2892                 struct iattr *sattr)
2893 {
2894         struct nfs4_exception exception = { };
2895         int err;
2896         do {
2897                 err = nfs4_handle_exception(NFS_SERVER(dir),
2898                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2899                                 &exception);
2900         } while (exception.retry);
2901         return err;
2902 }
2903
2904 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2905                   u64 cookie, struct page *page, unsigned int count, int plus)
2906 {
2907         struct inode            *dir = dentry->d_inode;
2908         struct nfs4_readdir_arg args = {
2909                 .fh = NFS_FH(dir),
2910                 .pages = &page,
2911                 .pgbase = 0,
2912                 .count = count,
2913                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2914         };
2915         struct nfs4_readdir_res res;
2916         struct rpc_message msg = {
2917                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2918                 .rpc_argp = &args,
2919                 .rpc_resp = &res,
2920                 .rpc_cred = cred,
2921         };
2922         int                     status;
2923
2924         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2925                         dentry->d_parent->d_name.name,
2926                         dentry->d_name.name,
2927                         (unsigned long long)cookie);
2928         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2929         res.pgbase = args.pgbase;
2930         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2931         if (status == 0)
2932                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2933
2934         nfs_invalidate_atime(dir);
2935
2936         dprintk("%s: returns %d\n", __func__, status);
2937         return status;
2938 }
2939
2940 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2941                   u64 cookie, struct page *page, unsigned int count, int plus)
2942 {
2943         struct nfs4_exception exception = { };
2944         int err;
2945         do {
2946                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2947                                 _nfs4_proc_readdir(dentry, cred, cookie,
2948                                         page, count, plus),
2949                                 &exception);
2950         } while (exception.retry);
2951         return err;
2952 }
2953
2954 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2955                 struct iattr *sattr, dev_t rdev)
2956 {
2957         struct nfs4_createdata *data;
2958         int mode = sattr->ia_mode;
2959         int status = -ENOMEM;
2960
2961         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2962         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2963
2964         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2965         if (data == NULL)
2966                 goto out;
2967
2968         if (S_ISFIFO(mode))
2969                 data->arg.ftype = NF4FIFO;
2970         else if (S_ISBLK(mode)) {
2971                 data->arg.ftype = NF4BLK;
2972                 data->arg.u.device.specdata1 = MAJOR(rdev);
2973                 data->arg.u.device.specdata2 = MINOR(rdev);
2974         }
2975         else if (S_ISCHR(mode)) {
2976                 data->arg.ftype = NF4CHR;
2977                 data->arg.u.device.specdata1 = MAJOR(rdev);
2978                 data->arg.u.device.specdata2 = MINOR(rdev);
2979         }
2980
2981         status = nfs4_do_create(dir, dentry, data);
2982
2983         nfs4_free_createdata(data);
2984 out:
2985         return status;
2986 }
2987
2988 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2989                 struct iattr *sattr, dev_t rdev)
2990 {
2991         struct nfs4_exception exception = { };
2992         int err;
2993         do {
2994                 err = nfs4_handle_exception(NFS_SERVER(dir),
2995                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2996                                 &exception);
2997         } while (exception.retry);
2998         return err;
2999 }
3000
3001 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3002                  struct nfs_fsstat *fsstat)
3003 {
3004         struct nfs4_statfs_arg args = {
3005                 .fh = fhandle,
3006                 .bitmask = server->attr_bitmask,
3007         };
3008         struct nfs4_statfs_res res = {
3009                 .fsstat = fsstat,
3010         };
3011         struct rpc_message msg = {
3012                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3013                 .rpc_argp = &args,
3014                 .rpc_resp = &res,
3015         };
3016
3017         nfs_fattr_init(fsstat->fattr);
3018         return  nfs4_call_sync(server, &msg, &args, &res, 0);
3019 }
3020
3021 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3022 {
3023         struct nfs4_exception exception = { };
3024         int err;
3025         do {
3026                 err = nfs4_handle_exception(server,
3027                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3028                                 &exception);
3029         } while (exception.retry);
3030         return err;
3031 }
3032
3033 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3034                 struct nfs_fsinfo *fsinfo)
3035 {
3036         struct nfs4_fsinfo_arg args = {
3037                 .fh = fhandle,
3038                 .bitmask = server->attr_bitmask,
3039         };
3040         struct nfs4_fsinfo_res res = {
3041                 .fsinfo = fsinfo,
3042         };
3043         struct rpc_message msg = {
3044                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3045                 .rpc_argp = &args,
3046                 .rpc_resp = &res,
3047         };
3048
3049         return nfs4_call_sync(server, &msg, &args, &res, 0);
3050 }
3051
3052 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3053 {
3054         struct nfs4_exception exception = { };
3055         int err;
3056
3057         do {
3058                 err = nfs4_handle_exception(server,
3059                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3060                                 &exception);
3061         } while (exception.retry);
3062         return err;
3063 }
3064
3065 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3066 {
3067         nfs_fattr_init(fsinfo->fattr);
3068         return nfs4_do_fsinfo(server, fhandle, fsinfo);
3069 }
3070
3071 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3072                 struct nfs_pathconf *pathconf)
3073 {
3074         struct nfs4_pathconf_arg args = {
3075                 .fh = fhandle,
3076                 .bitmask = server->attr_bitmask,
3077         };
3078         struct nfs4_pathconf_res res = {
3079                 .pathconf = pathconf,
3080         };
3081         struct rpc_message msg = {
3082                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3083                 .rpc_argp = &args,
3084                 .rpc_resp = &res,
3085         };
3086
3087         /* None of the pathconf attributes are mandatory to implement */
3088         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3089                 memset(pathconf, 0, sizeof(*pathconf));
3090                 return 0;
3091         }
3092
3093         nfs_fattr_init(pathconf->fattr);
3094         return nfs4_call_sync(server, &msg, &args, &res, 0);
3095 }
3096
3097 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3098                 struct nfs_pathconf *pathconf)
3099 {
3100         struct nfs4_exception exception = { };
3101         int err;
3102
3103         do {
3104                 err = nfs4_handle_exception(server,
3105                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3106                                 &exception);
3107         } while (exception.retry);
3108         return err;
3109 }
3110
3111 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3112 {
3113         struct nfs_server *server = NFS_SERVER(data->inode);
3114
3115         dprintk("--> %s\n", __func__);
3116
3117         if (!nfs4_sequence_done(task, &data->res.seq_res))
3118                 return -EAGAIN;
3119
3120         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3121                 nfs_restart_rpc(task, server->nfs_client);
3122                 return -EAGAIN;
3123         }
3124
3125         nfs_invalidate_atime(data->inode);
3126         if (task->tk_status > 0)
3127                 renew_lease(server, data->timestamp);
3128         return 0;
3129 }
3130
3131 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3132 {
3133         data->timestamp   = jiffies;
3134         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3135 }
3136
3137 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3138 {
3139         struct inode *inode = data->inode;
3140
3141         if (!nfs4_sequence_done(task, &data->res.seq_res))
3142                 return -EAGAIN;
3143
3144         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3145                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3146                 return -EAGAIN;
3147         }
3148         if (task->tk_status >= 0) {
3149                 renew_lease(NFS_SERVER(inode), data->timestamp);
3150                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3151         }
3152         return 0;
3153 }
3154
3155 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3156 {
3157         struct nfs_server *server = NFS_SERVER(data->inode);
3158
3159         data->args.bitmask = server->cache_consistency_bitmask;
3160         data->res.server = server;
3161         data->timestamp   = jiffies;
3162
3163         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3164 }
3165
3166 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3167 {
3168         struct inode *inode = data->inode;
3169
3170         if (!nfs4_sequence_done(task, &data->res.seq_res))
3171                 return -EAGAIN;
3172
3173         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3174                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3175                 return -EAGAIN;
3176         }
3177         nfs_refresh_inode(inode, data->res.fattr);
3178         return 0;
3179 }
3180
3181 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3182 {
3183         struct nfs_server *server = NFS_SERVER(data->inode);
3184
3185         data->args.bitmask = server->cache_consistency_bitmask;
3186         data->res.server = server;
3187         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3188 }
3189
3190 struct nfs4_renewdata {
3191         struct nfs_client       *client;
3192         unsigned long           timestamp;
3193 };
3194
3195 /*
3196  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3197  * standalone procedure for queueing an asynchronous RENEW.
3198  */
3199 static void nfs4_renew_release(void *calldata)
3200 {
3201         struct nfs4_renewdata *data = calldata;
3202         struct nfs_client *clp = data->client;
3203
3204         if (atomic_read(&clp->cl_count) > 1)
3205                 nfs4_schedule_state_renewal(clp);
3206         nfs_put_client(clp);
3207         kfree(data);
3208 }
3209
3210 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3211 {
3212         struct nfs4_renewdata *data = calldata;
3213         struct nfs_client *clp = data->client;
3214         unsigned long timestamp = data->timestamp;
3215
3216         if (task->tk_status < 0) {
3217                 /* Unless we're shutting down, schedule state recovery! */
3218                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3219                         nfs4_schedule_state_recovery(clp);
3220                 return;
3221         }
3222         spin_lock(&clp->cl_lock);
3223         if (time_before(clp->cl_last_renewal,timestamp))
3224                 clp->cl_last_renewal = timestamp;
3225         spin_unlock(&clp->cl_lock);
3226 }
3227
3228 static const struct rpc_call_ops nfs4_renew_ops = {
3229         .rpc_call_done = nfs4_renew_done,
3230         .rpc_release = nfs4_renew_release,
3231 };
3232
3233 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3234 {
3235         struct rpc_message msg = {
3236                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3237                 .rpc_argp       = clp,
3238                 .rpc_cred       = cred,
3239         };
3240         struct nfs4_renewdata *data;
3241
3242         if (!atomic_inc_not_zero(&clp->cl_count))
3243                 return -EIO;
3244         data = kmalloc(sizeof(*data), GFP_KERNEL);
3245         if (data == NULL)
3246                 return -ENOMEM;
3247         data->client = clp;
3248         data->timestamp = jiffies;
3249         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3250                         &nfs4_renew_ops, data);
3251 }
3252
3253 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3254 {
3255         struct rpc_message msg = {
3256                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3257                 .rpc_argp       = clp,
3258                 .rpc_cred       = cred,
3259         };
3260         unsigned long now = jiffies;
3261         int status;
3262
3263         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3264         if (status < 0)
3265                 return status;
3266         spin_lock(&clp->cl_lock);
3267         if (time_before(clp->cl_last_renewal,now))
3268                 clp->cl_last_renewal = now;
3269         spin_unlock(&clp->cl_lock);
3270         return 0;
3271 }
3272
3273 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3274 {
3275         return (server->caps & NFS_CAP_ACLS)
3276                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3277                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3278 }
3279
3280 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3281  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3282  * the stack.
3283  */
3284 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3285
3286 static void buf_to_pages(const void *buf, size_t buflen,
3287                 struct page **pages, unsigned int *pgbase)
3288 {
3289         const void *p = buf;
3290
3291         *pgbase = offset_in_page(buf);
3292         p -= *pgbase;
3293         while (p < buf + buflen) {
3294                 *(pages++) = virt_to_page(p);
3295                 p += PAGE_CACHE_SIZE;
3296         }
3297 }
3298
3299 struct nfs4_cached_acl {
3300         int cached;
3301         size_t len;
3302         char data[0];
3303 };
3304
3305 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3306 {
3307         struct nfs_inode *nfsi = NFS_I(inode);
3308
3309         spin_lock(&inode->i_lock);
3310         kfree(nfsi->nfs4_acl);
3311         nfsi->nfs4_acl = acl;
3312         spin_unlock(&inode->i_lock);
3313 }
3314
3315 static void nfs4_zap_acl_attr(struct inode *inode)
3316 {
3317         nfs4_set_cached_acl(inode, NULL);
3318 }
3319
3320 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3321 {
3322         struct nfs_inode *nfsi = NFS_I(inode);
3323         struct nfs4_cached_acl *acl;
3324         int ret = -ENOENT;
3325
3326         spin_lock(&inode->i_lock);
3327         acl = nfsi->nfs4_acl;
3328         if (acl == NULL)
3329                 goto out;
3330         if (buf == NULL) /* user is just asking for length */
3331                 goto out_len;
3332         if (acl->cached == 0)
3333                 goto out;
3334         ret = -ERANGE; /* see getxattr(2) man page */
3335         if (acl->len > buflen)
3336                 goto out;
3337         memcpy(buf, acl->data, acl->len);
3338 out_len:
3339         ret = acl->len;
3340 out:
3341         spin_unlock(&inode->i_lock);
3342         return ret;
3343 }
3344
3345 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3346 {
3347         struct nfs4_cached_acl *acl;
3348
3349         if (buf && acl_len <= PAGE_SIZE) {
3350                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3351                 if (acl == NULL)
3352                         goto out;
3353                 acl->cached = 1;
3354                 memcpy(acl->data, buf, acl_len);
3355         } else {
3356                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3357                 if (acl == NULL)
3358                         goto out;
3359                 acl->cached = 0;
3360         }
3361         acl->len = acl_len;
3362 out:
3363         nfs4_set_cached_acl(inode, acl);
3364 }
3365
3366 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3367 {
3368         struct page *pages[NFS4ACL_MAXPAGES];
3369         struct nfs_getaclargs args = {
3370                 .fh = NFS_FH(inode),
3371                 .acl_pages = pages,
3372                 .acl_len = buflen,
3373         };
3374         struct nfs_getaclres res = {
3375                 .acl_len = buflen,
3376         };
3377         void *resp_buf;
3378         struct rpc_message msg = {
3379                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3380                 .rpc_argp = &args,
3381                 .rpc_resp = &res,
3382         };
3383         struct page *localpage = NULL;
3384         int ret;
3385
3386         if (buflen < PAGE_SIZE) {
3387                 /* As long as we're doing a round trip to the server anyway,
3388                  * let's be prepared for a page of acl data. */
3389                 localpage = alloc_page(GFP_KERNEL);
3390                 resp_buf = page_address(localpage);
3391                 if (localpage == NULL)
3392                         return -ENOMEM;
3393                 args.acl_pages[0] = localpage;
3394                 args.acl_pgbase = 0;
3395                 args.acl_len = PAGE_SIZE;
3396         } else {
3397                 resp_buf = buf;
3398                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3399         }
3400         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3401         if (ret)
3402                 goto out_free;
3403         if (res.acl_len > args.acl_len)
3404                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3405         else
3406                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3407         if (buf) {
3408                 ret = -ERANGE;
3409                 if (res.acl_len > buflen)
3410                         goto out_free;
3411                 if (localpage)
3412                         memcpy(buf, resp_buf, res.acl_len);
3413         }
3414         ret = res.acl_len;
3415 out_free:
3416         if (localpage)
3417                 __free_page(localpage);
3418         return ret;
3419 }
3420
3421 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3422 {
3423         struct nfs4_exception exception = { };
3424         ssize_t ret;
3425         do {
3426                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3427                 if (ret >= 0)
3428                         break;
3429                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3430         } while (exception.retry);
3431         return ret;
3432 }
3433
3434 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3435 {
3436         struct nfs_server *server = NFS_SERVER(inode);
3437         int ret;
3438
3439         if (!nfs4_server_supports_acls(server))
3440                 return -EOPNOTSUPP;
3441         ret = nfs_revalidate_inode(server, inode);
3442         if (ret < 0)
3443                 return ret;
3444         ret = nfs4_read_cached_acl(inode, buf, buflen);
3445         if (ret != -ENOENT)
3446                 return ret;
3447         return nfs4_get_acl_uncached(inode, buf, buflen);
3448 }
3449
3450 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3451 {
3452         struct nfs_server *server = NFS_SERVER(inode);
3453         struct page *pages[NFS4ACL_MAXPAGES];
3454         struct nfs_setaclargs arg = {
3455                 .fh             = NFS_FH(inode),
3456                 .acl_pages      = pages,
3457                 .acl_len        = buflen,
3458         };
3459         struct nfs_setaclres res;
3460         struct rpc_message msg = {
3461                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3462                 .rpc_argp       = &arg,
3463                 .rpc_resp       = &res,
3464         };
3465         int ret;
3466
3467         if (!nfs4_server_supports_acls(server))
3468                 return -EOPNOTSUPP;
3469         nfs_inode_return_delegation(inode);
3470         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3471         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3472         nfs_access_zap_cache(inode);
3473         nfs_zap_acl_cache(inode);
3474         return ret;
3475 }
3476
3477 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3478 {
3479         struct nfs4_exception exception = { };
3480         int err;
3481         do {
3482                 err = nfs4_handle_exception(NFS_SERVER(inode),
3483                                 __nfs4_proc_set_acl(inode, buf, buflen),
3484                                 &exception);
3485         } while (exception.retry);
3486         return err;
3487 }
3488
3489 static int
3490 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3491 {
3492         struct nfs_client *clp = server->nfs_client;
3493
3494         if (task->tk_status >= 0)
3495                 return 0;
3496         switch(task->tk_status) {
3497                 case -NFS4ERR_ADMIN_REVOKED:
3498                 case -NFS4ERR_BAD_STATEID:
3499                 case -NFS4ERR_OPENMODE:
3500                         if (state == NULL)
3501                                 break;
3502                         nfs4_state_mark_reclaim_nograce(clp, state);
3503                         goto do_state_recovery;
3504                 case -NFS4ERR_STALE_STATEID:
3505                         if (state == NULL)
3506                                 break;
3507                         nfs4_state_mark_reclaim_reboot(clp, state);
3508                 case -NFS4ERR_STALE_CLIENTID:
3509                 case -NFS4ERR_EXPIRED:
3510                         goto do_state_recovery;
3511 #if defined(CONFIG_NFS_V4_1)
3512                 case -NFS4ERR_BADSESSION:
3513                 case -NFS4ERR_BADSLOT:
3514                 case -NFS4ERR_BAD_HIGH_SLOT:
3515                 case -NFS4ERR_DEADSESSION:
3516                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3517                 case -NFS4ERR_SEQ_FALSE_RETRY:
3518                 case -NFS4ERR_SEQ_MISORDERED:
3519                         dprintk("%s ERROR %d, Reset session\n", __func__,
3520                                 task->tk_status);
3521                         nfs4_schedule_state_recovery(clp);
3522                         task->tk_status = 0;
3523                         return -EAGAIN;
3524 #endif /* CONFIG_NFS_V4_1 */
3525                 case -NFS4ERR_DELAY:
3526                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3527                 case -NFS4ERR_GRACE:
3528                 case -EKEYEXPIRED:
3529                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3530                         task->tk_status = 0;
3531                         return -EAGAIN;
3532                 case -NFS4ERR_OLD_STATEID:
3533                         task->tk_status = 0;
3534                         return -EAGAIN;
3535         }
3536         task->tk_status = nfs4_map_errors(task->tk_status);
3537         return 0;
3538 do_state_recovery:
3539         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3540         nfs4_schedule_state_recovery(clp);
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         };
3556         struct rpc_message msg = {
3557                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3558                 .rpc_argp = &setclientid,
3559                 .rpc_resp = res,
3560                 .rpc_cred = cred,
3561         };
3562         __be32 *p;
3563         int loop = 0;
3564         int status;
3565
3566         p = (__be32*)sc_verifier.data;
3567         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3568         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3569
3570         for(;;) {
3571                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3572                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3573                                 clp->cl_ipaddr,
3574                                 rpc_peeraddr2str(clp->cl_rpcclient,
3575                                                         RPC_DISPLAY_ADDR),
3576                                 rpc_peeraddr2str(clp->cl_rpcclient,
3577                                                         RPC_DISPLAY_PROTO),
3578                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3579                                 clp->cl_id_uniquifier);
3580                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3581                                 sizeof(setclientid.sc_netid),
3582                                 rpc_peeraddr2str(clp->cl_rpcclient,
3583                                                         RPC_DISPLAY_NETID));
3584                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3585                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3586                                 clp->cl_ipaddr, port >> 8, port & 255);
3587
3588                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3589                 if (status != -NFS4ERR_CLID_INUSE)
3590                         break;
3591                 if (signalled())
3592                         break;
3593                 if (loop++ & 1)
3594                         ssleep(clp->cl_lease_time + 1);
3595                 else
3596                         if (++clp->cl_id_uniquifier == 0)
3597                                 break;
3598         }
3599         return status;
3600 }
3601
3602 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3603                 struct nfs4_setclientid_res *arg,
3604                 struct rpc_cred *cred)
3605 {
3606         struct nfs_fsinfo fsinfo;
3607         struct rpc_message msg = {
3608                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3609                 .rpc_argp = arg,
3610                 .rpc_resp = &fsinfo,
3611                 .rpc_cred = cred,
3612         };
3613         unsigned long now;
3614         int status;
3615
3616         now = jiffies;
3617         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3618         if (status == 0) {
3619                 spin_lock(&clp->cl_lock);
3620                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3621                 clp->cl_last_renewal = now;
3622                 spin_unlock(&clp->cl_lock);
3623         }
3624         return status;
3625 }
3626
3627 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
3628                 struct nfs4_setclientid_res *arg,
3629                 struct rpc_cred *cred)
3630 {
3631         long timeout = 0;
3632         int err;
3633         do {
3634                 err = _nfs4_proc_setclientid_confirm(clp, arg, cred);
3635                 switch (err) {
3636                         case 0:
3637                                 return err;
3638                         case -NFS4ERR_RESOURCE:
3639                                 /* The IBM lawyers misread another document! */
3640                         case -NFS4ERR_DELAY:
3641                         case -EKEYEXPIRED:
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         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3737         nfs_fattr_init(data->res.fattr);
3738         data->timestamp = jiffies;
3739         data->rpc_status = 0;
3740
3741         task_setup_data.callback_data = data;
3742         msg.rpc_argp = &data->args,
3743         msg.rpc_resp = &data->res,
3744         task = rpc_run_task(&task_setup_data);
3745         if (IS_ERR(task))
3746                 return PTR_ERR(task);
3747         if (!issync)
3748                 goto out;
3749         status = nfs4_wait_for_completion_rpc_task(task);
3750         if (status != 0)
3751                 goto out;
3752         status = data->rpc_status;
3753         if (status != 0)
3754                 goto out;
3755         nfs_refresh_inode(inode, &data->fattr);
3756 out:
3757         rpc_put_task(task);
3758         return status;
3759 }
3760
3761 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3762 {
3763         struct nfs_server *server = NFS_SERVER(inode);
3764         struct nfs4_exception exception = { };
3765         int err;
3766         do {
3767                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3768                 switch (err) {
3769                         case -NFS4ERR_STALE_STATEID:
3770                         case -NFS4ERR_EXPIRED:
3771                         case 0:
3772                                 return 0;
3773                 }
3774                 err = nfs4_handle_exception(server, err, &exception);
3775         } while (exception.retry);
3776         return err;
3777 }
3778
3779 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3780 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3781
3782 /*
3783  * sleep, with exponential backoff, and retry the LOCK operation.
3784  */
3785 static unsigned long
3786 nfs4_set_lock_task_retry(unsigned long timeout)
3787 {
3788         schedule_timeout_killable(timeout);
3789         timeout <<= 1;
3790         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3791                 return NFS4_LOCK_MAXTIMEOUT;
3792         return timeout;
3793 }
3794
3795 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3796 {
3797         struct inode *inode = state->inode;
3798         struct nfs_server *server = NFS_SERVER(inode);
3799         struct nfs_client *clp = server->nfs_client;
3800         struct nfs_lockt_args arg = {
3801                 .fh = NFS_FH(inode),
3802                 .fl = request,
3803         };
3804         struct nfs_lockt_res res = {
3805                 .denied = request,
3806         };
3807         struct rpc_message msg = {
3808                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3809                 .rpc_argp       = &arg,
3810                 .rpc_resp       = &res,
3811                 .rpc_cred       = state->owner->so_cred,
3812         };
3813         struct nfs4_lock_state *lsp;
3814         int status;
3815
3816         arg.lock_owner.clientid = clp->cl_clientid;
3817         status = nfs4_set_lock_state(state, request);
3818         if (status != 0)
3819                 goto out;
3820         lsp = request->fl_u.nfs4_fl.owner;
3821         arg.lock_owner.id = lsp->ls_id.id;
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->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3890         p->arg.stateid = &lsp->ls_stateid;
3891         p->lsp = lsp;
3892         atomic_inc(&lsp->ls_count);
3893         /* Ensure we don't close file until we're done freeing locks! */
3894         p->ctx = get_nfs_open_context(ctx);
3895         memcpy(&p->fl, fl, sizeof(p->fl));
3896         p->server = NFS_SERVER(inode);
3897         return p;
3898 }
3899
3900 static void nfs4_locku_release_calldata(void *data)
3901 {
3902         struct nfs4_unlockdata *calldata = data;
3903         nfs_free_seqid(calldata->arg.seqid);
3904         nfs4_put_lock_state(calldata->lsp);
3905         put_nfs_open_context(calldata->ctx);
3906         kfree(calldata);
3907 }
3908
3909 static void nfs4_locku_done(struct rpc_task *task, void *data)
3910 {
3911         struct nfs4_unlockdata *calldata = data;
3912
3913         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
3914                 return;
3915         if (RPC_ASSASSINATED(task))
3916                 return;
3917         switch (task->tk_status) {
3918                 case 0:
3919                         memcpy(calldata->lsp->ls_stateid.data,
3920                                         calldata->res.stateid.data,
3921                                         sizeof(calldata->lsp->ls_stateid.data));
3922                         renew_lease(calldata->server, calldata->timestamp);
3923                         break;
3924                 case -NFS4ERR_BAD_STATEID:
3925                 case -NFS4ERR_OLD_STATEID:
3926                 case -NFS4ERR_STALE_STATEID:
3927                 case -NFS4ERR_EXPIRED:
3928                         break;
3929                 default:
3930                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3931                                 nfs_restart_rpc(task,
3932                                                  calldata->server->nfs_client);
3933         }
3934 }
3935
3936 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3937 {
3938         struct nfs4_unlockdata *calldata = data;
3939
3940         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3941                 return;
3942         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3943                 /* Note: exit _without_ running nfs4_locku_done */
3944                 task->tk_action = NULL;
3945                 return;
3946         }
3947         calldata->timestamp = jiffies;
3948         if (nfs4_setup_sequence(calldata->server,
3949                                 &calldata->arg.seq_args,
3950                                 &calldata->res.seq_res, 1, task))
3951                 return;
3952         rpc_call_start(task);
3953 }
3954
3955 static const struct rpc_call_ops nfs4_locku_ops = {
3956         .rpc_call_prepare = nfs4_locku_prepare,
3957         .rpc_call_done = nfs4_locku_done,
3958         .rpc_release = nfs4_locku_release_calldata,
3959 };
3960
3961 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3962                 struct nfs_open_context *ctx,
3963                 struct nfs4_lock_state *lsp,
3964                 struct nfs_seqid *seqid)
3965 {
3966         struct nfs4_unlockdata *data;
3967         struct rpc_message msg = {
3968                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3969                 .rpc_cred = ctx->cred,
3970         };
3971         struct rpc_task_setup task_setup_data = {
3972                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3973                 .rpc_message = &msg,
3974                 .callback_ops = &nfs4_locku_ops,
3975                 .workqueue = nfsiod_workqueue,
3976                 .flags = RPC_TASK_ASYNC,
3977         };
3978
3979         /* Ensure this is an unlock - when canceling a lock, the
3980          * canceled lock is passed in, and it won't be an unlock.
3981          */
3982         fl->fl_type = F_UNLCK;
3983
3984         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3985         if (data == NULL) {
3986                 nfs_free_seqid(seqid);
3987                 return ERR_PTR(-ENOMEM);
3988         }
3989
3990         msg.rpc_argp = &data->arg,
3991         msg.rpc_resp = &data->res,
3992         task_setup_data.callback_data = data;
3993         return rpc_run_task(&task_setup_data);
3994 }
3995
3996 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3997 {
3998         struct nfs_inode *nfsi = NFS_I(state->inode);
3999         struct nfs_seqid *seqid;
4000         struct nfs4_lock_state *lsp;
4001         struct rpc_task *task;
4002         int status = 0;
4003         unsigned char fl_flags = request->fl_flags;
4004
4005         status = nfs4_set_lock_state(state, request);
4006         /* Unlock _before_ we do the RPC call */
4007         request->fl_flags |= FL_EXISTS;
4008         down_read(&nfsi->rwsem);
4009         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4010                 up_read(&nfsi->rwsem);
4011                 goto out;
4012         }
4013         up_read(&nfsi->rwsem);
4014         if (status != 0)
4015                 goto out;
4016         /* Is this a delegated lock? */
4017         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4018                 goto out;
4019         lsp = request->fl_u.nfs4_fl.owner;
4020         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4021         status = -ENOMEM;
4022         if (seqid == NULL)
4023                 goto out;
4024         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4025         status = PTR_ERR(task);
4026         if (IS_ERR(task))
4027                 goto out;
4028         status = nfs4_wait_for_completion_rpc_task(task);
4029         rpc_put_task(task);
4030 out:
4031         request->fl_flags = fl_flags;
4032         return status;
4033 }
4034
4035 struct nfs4_lockdata {
4036         struct nfs_lock_args arg;
4037         struct nfs_lock_res res;
4038         struct nfs4_lock_state *lsp;
4039         struct nfs_open_context *ctx;
4040         struct file_lock fl;
4041         unsigned long timestamp;
4042         int rpc_status;
4043         int cancelled;
4044         struct nfs_server *server;
4045 };
4046
4047 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4048                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4049                 gfp_t gfp_mask)
4050 {
4051         struct nfs4_lockdata *p;
4052         struct inode *inode = lsp->ls_state->inode;
4053         struct nfs_server *server = NFS_SERVER(inode);
4054
4055         p = kzalloc(sizeof(*p), gfp_mask);
4056         if (p == NULL)
4057                 return NULL;
4058
4059         p->arg.fh = NFS_FH(inode);
4060         p->arg.fl = &p->fl;
4061         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4062         if (p->arg.open_seqid == NULL)
4063                 goto out_free;
4064         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4065         if (p->arg.lock_seqid == NULL)
4066                 goto out_free_seqid;
4067         p->arg.lock_stateid = &lsp->ls_stateid;
4068         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4069         p->arg.lock_owner.id = lsp->ls_id.id;
4070         p->res.lock_seqid = p->arg.lock_seqid;
4071         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4072         p->lsp = lsp;
4073         p->server = server;
4074         atomic_inc(&lsp->ls_count);
4075         p->ctx = get_nfs_open_context(ctx);
4076         memcpy(&p->fl, fl, sizeof(p->fl));
4077         return p;
4078 out_free_seqid:
4079         nfs_free_seqid(p->arg.open_seqid);
4080 out_free:
4081         kfree(p);
4082         return NULL;
4083 }
4084
4085 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4086 {
4087         struct nfs4_lockdata *data = calldata;
4088         struct nfs4_state *state = data->lsp->ls_state;
4089
4090         dprintk("%s: begin!\n", __func__);
4091         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4092                 return;
4093         /* Do we need to do an open_to_lock_owner? */
4094         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4095                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4096                         return;
4097                 data->arg.open_stateid = &state->stateid;
4098                 data->arg.new_lock_owner = 1;
4099                 data->res.open_seqid = data->arg.open_seqid;
4100         } else
4101                 data->arg.new_lock_owner = 0;
4102         data->timestamp = jiffies;
4103         if (nfs4_setup_sequence(data->server,
4104                                 &data->arg.seq_args,
4105                                 &data->res.seq_res, 1, task))
4106                 return;
4107         rpc_call_start(task);
4108         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
4109 }
4110
4111 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4112 {
4113         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4114         nfs4_lock_prepare(task, calldata);
4115 }
4116
4117 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4118 {
4119         struct nfs4_lockdata *data = calldata;
4120
4121         dprintk("%s: begin!\n", __func__);
4122
4123         if (!nfs4_sequence_done(task, &data->res.seq_res))
4124                 return;
4125
4126         data->rpc_status = task->tk_status;
4127         if (RPC_ASSASSINATED(task))
4128                 goto out;
4129         if (data->arg.new_lock_owner != 0) {
4130                 if (data->rpc_status == 0)
4131                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4132                 else
4133                         goto out;
4134         }
4135         if (data->rpc_status == 0) {
4136                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
4137                                         sizeof(data->lsp->ls_stateid.data));
4138                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
4139                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
4140         }
4141 out:
4142         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4143 }
4144
4145 static void nfs4_lock_release(void *calldata)
4146 {
4147         struct nfs4_lockdata *data = calldata;
4148
4149         dprintk("%s: begin!\n", __func__);
4150         nfs_free_seqid(data->arg.open_seqid);
4151         if (data->cancelled != 0) {
4152                 struct rpc_task *task;
4153                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4154                                 data->arg.lock_seqid);
4155                 if (!IS_ERR(task))
4156                         rpc_put_task(task);
4157                 dprintk("%s: cancelling lock!\n", __func__);
4158         } else
4159                 nfs_free_seqid(data->arg.lock_seqid);
4160         nfs4_put_lock_state(data->lsp);
4161         put_nfs_open_context(data->ctx);
4162         kfree(data);
4163         dprintk("%s: done!\n", __func__);
4164 }
4165
4166 static const struct rpc_call_ops nfs4_lock_ops = {
4167         .rpc_call_prepare = nfs4_lock_prepare,
4168         .rpc_call_done = nfs4_lock_done,
4169         .rpc_release = nfs4_lock_release,
4170 };
4171
4172 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4173         .rpc_call_prepare = nfs4_recover_lock_prepare,
4174         .rpc_call_done = nfs4_lock_done,
4175         .rpc_release = nfs4_lock_release,
4176 };
4177
4178 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4179 {
4180         struct nfs_client *clp = server->nfs_client;
4181         struct nfs4_state *state = lsp->ls_state;
4182
4183         switch (error) {
4184         case -NFS4ERR_ADMIN_REVOKED:
4185         case -NFS4ERR_BAD_STATEID:
4186         case -NFS4ERR_EXPIRED:
4187                 if (new_lock_owner != 0 ||
4188                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4189                         nfs4_state_mark_reclaim_nograce(clp, state);
4190                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4191                 break;
4192         case -NFS4ERR_STALE_STATEID:
4193                 if (new_lock_owner != 0 ||
4194                     (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4195                         nfs4_state_mark_reclaim_reboot(clp, state);
4196                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4197         };
4198 }
4199
4200 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4201 {
4202         struct nfs4_lockdata *data;
4203         struct rpc_task *task;
4204         struct rpc_message msg = {
4205                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4206                 .rpc_cred = state->owner->so_cred,
4207         };
4208         struct rpc_task_setup task_setup_data = {
4209                 .rpc_client = NFS_CLIENT(state->inode),
4210                 .rpc_message = &msg,
4211                 .callback_ops = &nfs4_lock_ops,
4212                 .workqueue = nfsiod_workqueue,
4213                 .flags = RPC_TASK_ASYNC,
4214         };
4215         int ret;
4216
4217         dprintk("%s: begin!\n", __func__);
4218         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4219                         fl->fl_u.nfs4_fl.owner,
4220                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4221         if (data == NULL)
4222                 return -ENOMEM;
4223         if (IS_SETLKW(cmd))
4224                 data->arg.block = 1;
4225         if (recovery_type > NFS_LOCK_NEW) {
4226                 if (recovery_type == NFS_LOCK_RECLAIM)
4227                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4228                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4229         }
4230         msg.rpc_argp = &data->arg,
4231         msg.rpc_resp = &data->res,
4232         task_setup_data.callback_data = data;
4233         task = rpc_run_task(&task_setup_data);
4234         if (IS_ERR(task))
4235                 return PTR_ERR(task);
4236         ret = nfs4_wait_for_completion_rpc_task(task);
4237         if (ret == 0) {
4238                 ret = data->rpc_status;
4239                 if (ret)
4240                         nfs4_handle_setlk_error(data->server, data->lsp,
4241                                         data->arg.new_lock_owner, ret);
4242         } else
4243                 data->cancelled = 1;
4244         rpc_put_task(task);
4245         dprintk("%s: done, ret = %d!\n", __func__, ret);
4246         return ret;
4247 }
4248
4249 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4250 {
4251         struct nfs_server *server = NFS_SERVER(state->inode);
4252         struct nfs4_exception exception = { };
4253         int err;
4254
4255         do {
4256                 /* Cache the lock if possible... */
4257                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4258                         return 0;
4259                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4260                 if (err != -NFS4ERR_DELAY && err != -EKEYEXPIRED)
4261                         break;
4262                 nfs4_handle_exception(server, err, &exception);
4263         } while (exception.retry);
4264         return err;
4265 }
4266
4267 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4268 {
4269         struct nfs_server *server = NFS_SERVER(state->inode);
4270         struct nfs4_exception exception = { };
4271         int err;
4272
4273         err = nfs4_set_lock_state(state, request);
4274         if (err != 0)
4275                 return err;
4276         do {
4277                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4278                         return 0;
4279                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4280                 switch (err) {
4281                 default:
4282                         goto out;
4283                 case -NFS4ERR_GRACE:
4284                 case -NFS4ERR_DELAY:
4285                 case -EKEYEXPIRED:
4286                         nfs4_handle_exception(server, err, &exception);
4287                         err = 0;
4288                 }
4289         } while (exception.retry);
4290 out:
4291         return err;
4292 }
4293
4294 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4295 {
4296         struct nfs_inode *nfsi = NFS_I(state->inode);
4297         unsigned char fl_flags = request->fl_flags;
4298         int status = -ENOLCK;
4299
4300         if ((fl_flags & FL_POSIX) &&
4301                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4302                 goto out;
4303         /* Is this a delegated open? */
4304         status = nfs4_set_lock_state(state, request);
4305         if (status != 0)
4306                 goto out;
4307         request->fl_flags |= FL_ACCESS;
4308         status = do_vfs_lock(request->fl_file, request);
4309         if (status < 0)
4310                 goto out;
4311         down_read(&nfsi->rwsem);
4312         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4313                 /* Yes: cache locks! */
4314                 /* ...but avoid races with delegation recall... */
4315                 request->fl_flags = fl_flags & ~FL_SLEEP;
4316                 status = do_vfs_lock(request->fl_file, request);
4317                 goto out_unlock;
4318         }
4319         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4320         if (status != 0)
4321                 goto out_unlock;
4322         /* Note: we always want to sleep here! */
4323         request->fl_flags = fl_flags | FL_SLEEP;
4324         if (do_vfs_lock(request->fl_file, request) < 0)
4325                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4326 out_unlock:
4327         up_read(&nfsi->rwsem);
4328 out:
4329         request->fl_flags = fl_flags;
4330         return status;
4331 }
4332
4333 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4334 {
4335         struct nfs4_exception exception = { };
4336         int err;
4337
4338         do {
4339                 err = _nfs4_proc_setlk(state, cmd, request);
4340                 if (err == -NFS4ERR_DENIED)
4341                         err = -EAGAIN;
4342                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4343                                 err, &exception);
4344         } while (exception.retry);
4345         return err;
4346 }
4347
4348 static int
4349 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4350 {
4351         struct nfs_open_context *ctx;
4352         struct nfs4_state *state;
4353         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4354         int status;
4355
4356         /* verify open state */
4357         ctx = nfs_file_open_context(filp);
4358         state = ctx->state;
4359
4360         if (request->fl_start < 0 || request->fl_end < 0)
4361                 return -EINVAL;
4362
4363         if (IS_GETLK(cmd)) {
4364                 if (state != NULL)
4365                         return nfs4_proc_getlk(state, F_GETLK, request);
4366                 return 0;
4367         }
4368
4369         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4370                 return -EINVAL;
4371
4372         if (request->fl_type == F_UNLCK) {
4373                 if (state != NULL)
4374                         return nfs4_proc_unlck(state, cmd, request);
4375                 return 0;
4376         }
4377
4378         if (state == NULL)
4379                 return -ENOLCK;
4380         do {
4381                 status = nfs4_proc_setlk(state, cmd, request);
4382                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4383                         break;
4384                 timeout = nfs4_set_lock_task_retry(timeout);
4385                 status = -ERESTARTSYS;
4386                 if (signalled())
4387                         break;
4388         } while(status < 0);
4389         return status;
4390 }
4391
4392 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4393 {
4394         struct nfs_server *server = NFS_SERVER(state->inode);
4395         struct nfs4_exception exception = { };
4396         int err;
4397
4398         err = nfs4_set_lock_state(state, fl);
4399         if (err != 0)
4400                 goto out;
4401         do {
4402                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4403                 switch (err) {
4404                         default:
4405                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4406                                                 __func__, err);
4407                         case 0:
4408                         case -ESTALE:
4409                                 goto out;
4410                         case -NFS4ERR_EXPIRED:
4411                         case -NFS4ERR_STALE_CLIENTID:
4412                         case -NFS4ERR_STALE_STATEID:
4413                         case -NFS4ERR_BADSESSION:
4414                         case -NFS4ERR_BADSLOT:
4415                         case -NFS4ERR_BAD_HIGH_SLOT:
4416                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4417                         case -NFS4ERR_DEADSESSION:
4418                                 nfs4_schedule_state_recovery(server->nfs_client);
4419                                 goto out;
4420                         case -ERESTARTSYS:
4421                                 /*
4422                                  * The show must go on: exit, but mark the
4423                                  * stateid as needing recovery.
4424                                  */
4425                         case -NFS4ERR_ADMIN_REVOKED:
4426                         case -NFS4ERR_BAD_STATEID:
4427                         case -NFS4ERR_OPENMODE:
4428                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
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                         case -EKEYEXPIRED:
4438                                 break;
4439                 }
4440                 err = nfs4_handle_exception(server, err, &exception);
4441         } while (exception.retry);
4442 out:
4443         return err;
4444 }
4445
4446 static void nfs4_release_lockowner_release(void *calldata)
4447 {
4448         kfree(calldata);
4449 }
4450
4451 const struct rpc_call_ops nfs4_release_lockowner_ops = {
4452         .rpc_release = nfs4_release_lockowner_release,
4453 };
4454
4455 void nfs4_release_lockowner(const struct nfs4_lock_state *lsp)
4456 {
4457         struct nfs_server *server = lsp->ls_state->owner->so_server;
4458         struct nfs_release_lockowner_args *args;
4459         struct rpc_message msg = {
4460                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
4461         };
4462
4463         if (server->nfs_client->cl_mvops->minor_version != 0)
4464                 return;
4465         args = kmalloc(sizeof(*args), GFP_NOFS);
4466         if (!args)
4467                 return;
4468         args->lock_owner.clientid = server->nfs_client->cl_clientid;
4469         args->lock_owner.id = lsp->ls_id.id;
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 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4477                 size_t buflen, int flags)
4478 {
4479         struct inode *inode = dentry->d_inode;
4480
4481         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4482                 return -EOPNOTSUPP;
4483
4484         return nfs4_proc_set_acl(inode, buf, buflen);
4485 }
4486
4487 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4488  * and that's what we'll do for e.g. user attributes that haven't been set.
4489  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4490  * attributes in kernel-managed attribute namespaces. */
4491 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4492                 size_t buflen)
4493 {
4494         struct inode *inode = dentry->d_inode;
4495
4496         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4497                 return -EOPNOTSUPP;
4498
4499         return nfs4_proc_get_acl(inode, buf, buflen);
4500 }
4501
4502 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4503 {
4504         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4505
4506         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4507                 return 0;
4508         if (buf && buflen < len)
4509                 return -ERANGE;
4510         if (buf)
4511                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4512         return len;
4513 }
4514
4515 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4516 {
4517         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4518                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4519                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4520                 return;
4521
4522         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4523                 NFS_ATTR_FATTR_NLINK;
4524         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4525         fattr->nlink = 2;
4526 }
4527
4528 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4529                 struct nfs4_fs_locations *fs_locations, struct page *page)
4530 {
4531         struct nfs_server *server = NFS_SERVER(dir);
4532         u32 bitmask[2] = {
4533                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4534                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4535         };
4536         struct nfs4_fs_locations_arg args = {
4537                 .dir_fh = NFS_FH(dir),
4538                 .name = name,
4539                 .page = page,
4540                 .bitmask = bitmask,
4541         };
4542         struct nfs4_fs_locations_res res = {
4543                 .fs_locations = fs_locations,
4544         };
4545         struct rpc_message msg = {
4546                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4547                 .rpc_argp = &args,
4548                 .rpc_resp = &res,
4549         };
4550         int status;
4551
4552         dprintk("%s: start\n", __func__);
4553         nfs_fattr_init(&fs_locations->fattr);
4554         fs_locations->server = server;
4555         fs_locations->nlocations = 0;
4556         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4557         nfs_fixup_referral_attributes(&fs_locations->fattr);
4558         dprintk("%s: returned status = %d\n", __func__, status);
4559         return status;
4560 }
4561
4562 #ifdef CONFIG_NFS_V4_1
4563 /*
4564  * nfs4_proc_exchange_id()
4565  *
4566  * Since the clientid has expired, all compounds using sessions
4567  * associated with the stale clientid will be returning
4568  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4569  * be in some phase of session reset.
4570  */
4571 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4572 {
4573         nfs4_verifier verifier;
4574         struct nfs41_exchange_id_args args = {
4575                 .client = clp,
4576                 .flags = clp->cl_exchange_flags,
4577         };
4578         struct nfs41_exchange_id_res res = {
4579                 .client = clp,
4580         };
4581         int status;
4582         struct rpc_message msg = {
4583                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4584                 .rpc_argp = &args,
4585                 .rpc_resp = &res,
4586                 .rpc_cred = cred,
4587         };
4588         __be32 *p;
4589
4590         dprintk("--> %s\n", __func__);
4591         BUG_ON(clp == NULL);
4592
4593         /* Remove server-only flags */
4594         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4595
4596         p = (u32 *)verifier.data;
4597         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4598         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4599         args.verifier = &verifier;
4600
4601         while (1) {
4602                 args.id_len = scnprintf(args.id, sizeof(args.id),
4603                                         "%s/%s %u",
4604                                         clp->cl_ipaddr,
4605                                         rpc_peeraddr2str(clp->cl_rpcclient,
4606                                                          RPC_DISPLAY_ADDR),
4607                                         clp->cl_id_uniquifier);
4608
4609                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4610
4611                 if (status != -NFS4ERR_CLID_INUSE)
4612                         break;
4613
4614                 if (signalled())
4615                         break;
4616
4617                 if (++clp->cl_id_uniquifier == 0)
4618                         break;
4619         }
4620
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         case -EKEYEXPIRED:
4667                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4668                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4669                 task->tk_status = 0;
4670                 nfs_restart_rpc(task, data->clp);
4671                 return;
4672         }
4673         dprintk("<-- %s\n", __func__);
4674 }
4675
4676 struct rpc_call_ops nfs4_get_lease_time_ops = {
4677         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4678         .rpc_call_done = nfs4_get_lease_time_done,
4679 };
4680
4681 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4682 {
4683         struct rpc_task *task;
4684         struct nfs4_get_lease_time_args args;
4685         struct nfs4_get_lease_time_res res = {
4686                 .lr_fsinfo = fsinfo,
4687         };
4688         struct nfs4_get_lease_time_data data = {
4689                 .args = &args,
4690                 .res = &res,
4691                 .clp = clp,
4692         };
4693         struct rpc_message msg = {
4694                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4695                 .rpc_argp = &args,
4696                 .rpc_resp = &res,
4697         };
4698         struct rpc_task_setup task_setup = {
4699                 .rpc_client = clp->cl_rpcclient,
4700                 .rpc_message = &msg,
4701                 .callback_ops = &nfs4_get_lease_time_ops,
4702                 .callback_data = &data
4703         };
4704         int status;
4705
4706         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4707         dprintk("--> %s\n", __func__);
4708         task = rpc_run_task(&task_setup);
4709
4710         if (IS_ERR(task))
4711                 status = PTR_ERR(task);
4712         else {
4713                 status = task->tk_status;
4714                 rpc_put_task(task);
4715         }
4716         dprintk("<-- %s return %d\n", __func__, status);
4717
4718         return status;
4719 }
4720
4721 /*
4722  * Reset a slot table
4723  */
4724 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, u32 max_reqs,
4725                                  int ivalue)
4726 {
4727         struct nfs4_slot *new = NULL;
4728         int i;
4729         int ret = 0;
4730
4731         dprintk("--> %s: max_reqs=%u, tbl->max_slots %d\n", __func__,
4732                 max_reqs, tbl->max_slots);
4733
4734         /* Does the newly negotiated max_reqs match the existing slot table? */
4735         if (max_reqs != tbl->max_slots) {
4736                 ret = -ENOMEM;
4737                 new = kmalloc(max_reqs * sizeof(struct nfs4_slot),
4738                               GFP_NOFS);
4739                 if (!new)
4740                         goto out;
4741                 ret = 0;
4742                 kfree(tbl->slots);
4743         }
4744         spin_lock(&tbl->slot_tbl_lock);
4745         if (new) {
4746                 tbl->slots = new;
4747                 tbl->max_slots = max_reqs;
4748         }
4749         for (i = 0; i < tbl->max_slots; ++i)
4750                 tbl->slots[i].seq_nr = ivalue;
4751         spin_unlock(&tbl->slot_tbl_lock);
4752         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4753                 tbl, tbl->slots, tbl->max_slots);
4754 out:
4755         dprintk("<-- %s: return %d\n", __func__, ret);
4756         return ret;
4757 }
4758
4759 /*
4760  * Reset the forechannel and backchannel slot tables
4761  */
4762 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4763 {
4764         int status;
4765
4766         status = nfs4_reset_slot_table(&session->fc_slot_table,
4767                         session->fc_attrs.max_reqs, 1);
4768         if (status)
4769                 return status;
4770
4771         status = nfs4_reset_slot_table(&session->bc_slot_table,
4772                         session->bc_attrs.max_reqs, 0);
4773         return status;
4774 }
4775
4776 /* Destroy the slot table */
4777 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4778 {
4779         if (session->fc_slot_table.slots != NULL) {
4780                 kfree(session->fc_slot_table.slots);
4781                 session->fc_slot_table.slots = NULL;
4782         }
4783         if (session->bc_slot_table.slots != NULL) {
4784                 kfree(session->bc_slot_table.slots);
4785                 session->bc_slot_table.slots = NULL;
4786         }
4787         return;
4788 }
4789
4790 /*
4791  * Initialize slot table
4792  */
4793 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4794                 int max_slots, int ivalue)
4795 {
4796         struct nfs4_slot *slot;
4797         int ret = -ENOMEM;
4798
4799         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4800
4801         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4802
4803         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_NOFS);
4804         if (!slot)
4805                 goto out;
4806         ret = 0;
4807
4808         spin_lock(&tbl->slot_tbl_lock);
4809         tbl->max_slots = max_slots;
4810         tbl->slots = slot;
4811         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4812         spin_unlock(&tbl->slot_tbl_lock);
4813         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4814                 tbl, tbl->slots, tbl->max_slots);
4815 out:
4816         dprintk("<-- %s: return %d\n", __func__, ret);
4817         return ret;
4818 }
4819
4820 /*
4821  * Initialize the forechannel and backchannel tables
4822  */
4823 static int nfs4_init_slot_tables(struct nfs4_session *session)
4824 {
4825         struct nfs4_slot_table *tbl;
4826         int status = 0;
4827
4828         tbl = &session->fc_slot_table;
4829         if (tbl->slots == NULL) {
4830                 status = nfs4_init_slot_table(tbl,
4831                                 session->fc_attrs.max_reqs, 1);
4832                 if (status)
4833                         return status;
4834         }
4835
4836         tbl = &session->bc_slot_table;
4837         if (tbl->slots == NULL) {
4838                 status = nfs4_init_slot_table(tbl,
4839                                 session->bc_attrs.max_reqs, 0);
4840                 if (status)
4841                         nfs4_destroy_slot_tables(session);
4842         }
4843
4844         return status;
4845 }
4846
4847 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4848 {
4849         struct nfs4_session *session;
4850         struct nfs4_slot_table *tbl;
4851
4852         session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
4853         if (!session)
4854                 return NULL;
4855
4856         init_completion(&session->complete);
4857
4858         tbl = &session->fc_slot_table;
4859         tbl->highest_used_slotid = -1;
4860         spin_lock_init(&tbl->slot_tbl_lock);
4861         rpc_init_priority_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4862
4863         tbl = &session->bc_slot_table;
4864         tbl->highest_used_slotid = -1;
4865         spin_lock_init(&tbl->slot_tbl_lock);
4866         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4867
4868         session->session_state = 1<<NFS4_SESSION_INITING;
4869
4870         session->clp = clp;
4871         return session;
4872 }
4873
4874 void nfs4_destroy_session(struct nfs4_session *session)
4875 {
4876         nfs4_proc_destroy_session(session);
4877         dprintk("%s Destroy backchannel for xprt %p\n",
4878                 __func__, session->clp->cl_rpcclient->cl_xprt);
4879         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4880                                 NFS41_BC_MIN_CALLBACKS);
4881         nfs4_destroy_slot_tables(session);
4882         kfree(session);
4883 }
4884
4885 /*
4886  * Initialize the values to be used by the client in CREATE_SESSION
4887  * If nfs4_init_session set the fore channel request and response sizes,
4888  * use them.
4889  *
4890  * Set the back channel max_resp_sz_cached to zero to force the client to
4891  * always set csa_cachethis to FALSE because the current implementation
4892  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4893  */
4894 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4895 {
4896         struct nfs4_session *session = args->client->cl_session;
4897         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4898                      mxresp_sz = session->fc_attrs.max_resp_sz;
4899
4900         if (mxrqst_sz == 0)
4901                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4902         if (mxresp_sz == 0)
4903                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4904         /* Fore channel attributes */
4905         args->fc_attrs.headerpadsz = 0;
4906         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4907         args->fc_attrs.max_resp_sz = mxresp_sz;
4908         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4909         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4910
4911         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4912                 "max_ops=%u max_reqs=%u\n",
4913                 __func__,
4914                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4915                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
4916
4917         /* Back channel attributes */
4918         args->bc_attrs.headerpadsz = 0;
4919         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4920         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4921         args->bc_attrs.max_resp_sz_cached = 0;
4922         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4923         args->bc_attrs.max_reqs = 1;
4924
4925         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4926                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4927                 __func__,
4928                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4929                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4930                 args->bc_attrs.max_reqs);
4931 }
4932
4933 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4934 {
4935         if (rcvd <= sent)
4936                 return 0;
4937         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4938                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4939         return -EINVAL;
4940 }
4941
4942 #define _verify_fore_channel_attr(_name_) \
4943         _verify_channel_attr("fore", #_name_, \
4944                              args->fc_attrs._name_, \
4945                              session->fc_attrs._name_)
4946
4947 #define _verify_back_channel_attr(_name_) \
4948         _verify_channel_attr("back", #_name_, \
4949                              args->bc_attrs._name_, \
4950                              session->bc_attrs._name_)
4951
4952 /*
4953  * The server is not allowed to increase the fore channel header pad size,
4954  * maximum response size, or maximum number of operations.
4955  *
4956  * The back channel attributes are only negotiatied down: We send what the
4957  * (back channel) server insists upon.
4958  */
4959 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4960                                      struct nfs4_session *session)
4961 {
4962         int ret = 0;
4963
4964         ret |= _verify_fore_channel_attr(headerpadsz);
4965         ret |= _verify_fore_channel_attr(max_resp_sz);
4966         ret |= _verify_fore_channel_attr(max_ops);
4967
4968         ret |= _verify_back_channel_attr(headerpadsz);
4969         ret |= _verify_back_channel_attr(max_rqst_sz);
4970         ret |= _verify_back_channel_attr(max_resp_sz);
4971         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4972         ret |= _verify_back_channel_attr(max_ops);
4973         ret |= _verify_back_channel_attr(max_reqs);
4974
4975         return ret;
4976 }
4977
4978 static int _nfs4_proc_create_session(struct nfs_client *clp)
4979 {
4980         struct nfs4_session *session = clp->cl_session;
4981         struct nfs41_create_session_args args = {
4982                 .client = clp,
4983                 .cb_program = NFS4_CALLBACK,
4984         };
4985         struct nfs41_create_session_res res = {
4986                 .client = clp,
4987         };
4988         struct rpc_message msg = {
4989                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4990                 .rpc_argp = &args,
4991                 .rpc_resp = &res,
4992         };
4993         int status;
4994
4995         nfs4_init_channel_attrs(&args);
4996         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4997
4998         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4999
5000         if (!status)
5001                 /* Verify the session's negotiated channel_attrs values */
5002                 status = nfs4_verify_channel_attrs(&args, session);
5003         if (!status) {
5004                 /* Increment the clientid slot sequence id */
5005                 clp->cl_seqid++;
5006         }
5007
5008         return status;
5009 }
5010
5011 /*
5012  * Issues a CREATE_SESSION operation to the server.
5013  * It is the responsibility of the caller to verify the session is
5014  * expired before calling this routine.
5015  */
5016 int nfs4_proc_create_session(struct nfs_client *clp)
5017 {
5018         int status;
5019         unsigned *ptr;
5020         struct nfs4_session *session = clp->cl_session;
5021
5022         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5023
5024         status = _nfs4_proc_create_session(clp);
5025         if (status)
5026                 goto out;
5027
5028         /* Init and reset the fore channel */
5029         status = nfs4_init_slot_tables(session);
5030         dprintk("slot table initialization returned %d\n", status);
5031         if (status)
5032                 goto out;
5033         status = nfs4_reset_slot_tables(session);
5034         dprintk("slot table reset returned %d\n", status);
5035         if (status)
5036                 goto out;
5037
5038         ptr = (unsigned *)&session->sess_id.data[0];
5039         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5040                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5041 out:
5042         dprintk("<-- %s\n", __func__);
5043         return status;
5044 }
5045
5046 /*
5047  * Issue the over-the-wire RPC DESTROY_SESSION.
5048  * The caller must serialize access to this routine.
5049  */
5050 int nfs4_proc_destroy_session(struct nfs4_session *session)
5051 {
5052         int status = 0;
5053         struct rpc_message msg;
5054
5055         dprintk("--> nfs4_proc_destroy_session\n");
5056
5057         /* session is still being setup */
5058         if (session->clp->cl_cons_state != NFS_CS_READY)
5059                 return status;
5060
5061         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
5062         msg.rpc_argp = session;
5063         msg.rpc_resp = NULL;
5064         msg.rpc_cred = NULL;
5065         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
5066
5067         if (status)
5068                 printk(KERN_WARNING
5069                         "Got error %d from the server on DESTROY_SESSION. "
5070                         "Session has been destroyed regardless...\n", status);
5071
5072         dprintk("<-- nfs4_proc_destroy_session\n");
5073         return status;
5074 }
5075
5076 int nfs4_init_session(struct nfs_server *server)
5077 {
5078         struct nfs_client *clp = server->nfs_client;
5079         struct nfs4_session *session;
5080         unsigned int rsize, wsize;
5081         int ret;
5082
5083         if (!nfs4_has_session(clp))
5084                 return 0;
5085
5086         session = clp->cl_session;
5087         if (!test_and_clear_bit(NFS4_SESSION_INITING, &session->session_state))
5088                 return 0;
5089
5090         rsize = server->rsize;
5091         if (rsize == 0)
5092                 rsize = NFS_MAX_FILE_IO_SIZE;
5093         wsize = server->wsize;
5094         if (wsize == 0)
5095                 wsize = NFS_MAX_FILE_IO_SIZE;
5096
5097         session->fc_attrs.max_rqst_sz = wsize + nfs41_maxwrite_overhead;
5098         session->fc_attrs.max_resp_sz = rsize + nfs41_maxread_overhead;
5099
5100         ret = nfs4_recover_expired_lease(server);
5101         if (!ret)
5102                 ret = nfs4_check_client_ready(clp);
5103         return ret;
5104 }
5105
5106 /*
5107  * Renew the cl_session lease.
5108  */
5109 struct nfs4_sequence_data {
5110         struct nfs_client *clp;
5111         struct nfs4_sequence_args args;
5112         struct nfs4_sequence_res res;
5113 };
5114
5115 static void nfs41_sequence_release(void *data)
5116 {
5117         struct nfs4_sequence_data *calldata = data;
5118         struct nfs_client *clp = calldata->clp;
5119
5120         if (atomic_read(&clp->cl_count) > 1)
5121                 nfs4_schedule_state_renewal(clp);
5122         nfs_put_client(clp);
5123         kfree(calldata);
5124 }
5125
5126 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5127 {
5128         switch(task->tk_status) {
5129         case -NFS4ERR_DELAY:
5130         case -EKEYEXPIRED:
5131                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5132                 return -EAGAIN;
5133         default:
5134                 nfs4_schedule_state_recovery(clp);
5135         }
5136         return 0;
5137 }
5138
5139 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5140 {
5141         struct nfs4_sequence_data *calldata = data;
5142         struct nfs_client *clp = calldata->clp;
5143
5144         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5145                 return;
5146
5147         if (task->tk_status < 0) {
5148                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5149                 if (atomic_read(&clp->cl_count) == 1)
5150                         goto out;
5151
5152                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5153                         rpc_restart_call_prepare(task);
5154                         return;
5155                 }
5156         }
5157         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5158 out:
5159         dprintk("<-- %s\n", __func__);
5160 }
5161
5162 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5163 {
5164         struct nfs4_sequence_data *calldata = data;
5165         struct nfs_client *clp = calldata->clp;
5166         struct nfs4_sequence_args *args;
5167         struct nfs4_sequence_res *res;
5168
5169         args = task->tk_msg.rpc_argp;
5170         res = task->tk_msg.rpc_resp;
5171
5172         if (nfs41_setup_sequence(clp->cl_session, args, res, 0, task))
5173                 return;
5174         rpc_call_start(task);
5175 }
5176
5177 static const struct rpc_call_ops nfs41_sequence_ops = {
5178         .rpc_call_done = nfs41_sequence_call_done,
5179         .rpc_call_prepare = nfs41_sequence_prepare,
5180         .rpc_release = nfs41_sequence_release,
5181 };
5182
5183 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5184 {
5185         struct nfs4_sequence_data *calldata;
5186         struct rpc_message msg = {
5187                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5188                 .rpc_cred = cred,
5189         };
5190         struct rpc_task_setup task_setup_data = {
5191                 .rpc_client = clp->cl_rpcclient,
5192                 .rpc_message = &msg,
5193                 .callback_ops = &nfs41_sequence_ops,
5194                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5195         };
5196
5197         if (!atomic_inc_not_zero(&clp->cl_count))
5198                 return ERR_PTR(-EIO);
5199         calldata = kmalloc(sizeof(*calldata), GFP_NOFS);
5200         if (calldata == NULL) {
5201                 nfs_put_client(clp);
5202                 return ERR_PTR(-ENOMEM);
5203         }
5204         calldata->res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5205         msg.rpc_argp = &calldata->args;
5206         msg.rpc_resp = &calldata->res;
5207         calldata->clp = clp;
5208         task_setup_data.callback_data = calldata;
5209
5210         return rpc_run_task(&task_setup_data);
5211 }
5212
5213 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5214 {
5215         struct rpc_task *task;
5216         int ret = 0;
5217
5218         task = _nfs41_proc_sequence(clp, cred);
5219         if (IS_ERR(task))
5220                 ret = PTR_ERR(task);
5221         else
5222                 rpc_put_task(task);
5223         dprintk("<-- %s status=%d\n", __func__, ret);
5224         return ret;
5225 }
5226
5227 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5228 {
5229         struct rpc_task *task;
5230         int ret;
5231
5232         task = _nfs41_proc_sequence(clp, cred);
5233         if (IS_ERR(task)) {
5234                 ret = PTR_ERR(task);
5235                 goto out;
5236         }
5237         ret = rpc_wait_for_completion_task(task);
5238         if (!ret)
5239                 ret = task->tk_status;
5240         rpc_put_task(task);
5241 out:
5242         dprintk("<-- %s status=%d\n", __func__, ret);
5243         return ret;
5244 }
5245
5246 struct nfs4_reclaim_complete_data {
5247         struct nfs_client *clp;
5248         struct nfs41_reclaim_complete_args arg;
5249         struct nfs41_reclaim_complete_res res;
5250 };
5251
5252 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5253 {
5254         struct nfs4_reclaim_complete_data *calldata = data;
5255
5256         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5257         if (nfs41_setup_sequence(calldata->clp->cl_session,
5258                                 &calldata->arg.seq_args,
5259                                 &calldata->res.seq_res, 0, task))
5260                 return;
5261
5262         rpc_call_start(task);
5263 }
5264
5265 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5266 {
5267         switch(task->tk_status) {
5268         case 0:
5269         case -NFS4ERR_COMPLETE_ALREADY:
5270         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5271                 break;
5272         case -NFS4ERR_DELAY:
5273         case -EKEYEXPIRED:
5274                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5275                 return -EAGAIN;
5276         default:
5277                 nfs4_schedule_state_recovery(clp);
5278         }
5279         return 0;
5280 }
5281
5282 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5283 {
5284         struct nfs4_reclaim_complete_data *calldata = data;
5285         struct nfs_client *clp = calldata->clp;
5286         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5287
5288         dprintk("--> %s\n", __func__);
5289         if (!nfs41_sequence_done(task, res))
5290                 return;
5291
5292         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5293                 rpc_restart_call_prepare(task);
5294                 return;
5295         }
5296         dprintk("<-- %s\n", __func__);
5297 }
5298
5299 static void nfs4_free_reclaim_complete_data(void *data)
5300 {
5301         struct nfs4_reclaim_complete_data *calldata = data;
5302
5303         kfree(calldata);
5304 }
5305
5306 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5307         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5308         .rpc_call_done = nfs4_reclaim_complete_done,
5309         .rpc_release = nfs4_free_reclaim_complete_data,
5310 };
5311
5312 /*
5313  * Issue a global reclaim complete.
5314  */
5315 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5316 {
5317         struct nfs4_reclaim_complete_data *calldata;
5318         struct rpc_task *task;
5319         struct rpc_message msg = {
5320                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5321         };
5322         struct rpc_task_setup task_setup_data = {
5323                 .rpc_client = clp->cl_rpcclient,
5324                 .rpc_message = &msg,
5325                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5326                 .flags = RPC_TASK_ASYNC,
5327         };
5328         int status = -ENOMEM;
5329
5330         dprintk("--> %s\n", __func__);
5331         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5332         if (calldata == NULL)
5333                 goto out;
5334         calldata->clp = clp;
5335         calldata->arg.one_fs = 0;
5336         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5337
5338         msg.rpc_argp = &calldata->arg;
5339         msg.rpc_resp = &calldata->res;
5340         task_setup_data.callback_data = calldata;
5341         task = rpc_run_task(&task_setup_data);
5342         if (IS_ERR(task)) {
5343                 status = PTR_ERR(task);
5344                 goto out;
5345         }
5346         rpc_put_task(task);
5347         return 0;
5348 out:
5349         dprintk("<-- %s status=%d\n", __func__, status);
5350         return status;
5351 }
5352 #endif /* CONFIG_NFS_V4_1 */
5353
5354 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5355         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5356         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5357         .recover_open   = nfs4_open_reclaim,
5358         .recover_lock   = nfs4_lock_reclaim,
5359         .establish_clid = nfs4_init_clientid,
5360         .get_clid_cred  = nfs4_get_setclientid_cred,
5361 };
5362
5363 #if defined(CONFIG_NFS_V4_1)
5364 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5365         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5366         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5367         .recover_open   = nfs4_open_reclaim,
5368         .recover_lock   = nfs4_lock_reclaim,
5369         .establish_clid = nfs41_init_clientid,
5370         .get_clid_cred  = nfs4_get_exchange_id_cred,
5371         .reclaim_complete = nfs41_proc_reclaim_complete,
5372 };
5373 #endif /* CONFIG_NFS_V4_1 */
5374
5375 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5376         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5377         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5378         .recover_open   = nfs4_open_expired,
5379         .recover_lock   = nfs4_lock_expired,
5380         .establish_clid = nfs4_init_clientid,
5381         .get_clid_cred  = nfs4_get_setclientid_cred,
5382 };
5383
5384 #if defined(CONFIG_NFS_V4_1)
5385 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5386         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5387         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5388         .recover_open   = nfs4_open_expired,
5389         .recover_lock   = nfs4_lock_expired,
5390         .establish_clid = nfs41_init_clientid,
5391         .get_clid_cred  = nfs4_get_exchange_id_cred,
5392 };
5393 #endif /* CONFIG_NFS_V4_1 */
5394
5395 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5396         .sched_state_renewal = nfs4_proc_async_renew,
5397         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5398         .renew_lease = nfs4_proc_renew,
5399 };
5400
5401 #if defined(CONFIG_NFS_V4_1)
5402 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5403         .sched_state_renewal = nfs41_proc_async_sequence,
5404         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5405         .renew_lease = nfs4_proc_sequence,
5406 };
5407 #endif
5408
5409 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
5410         .minor_version = 0,
5411         .call_sync = _nfs4_call_sync,
5412         .validate_stateid = nfs4_validate_delegation_stateid,
5413         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
5414         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
5415         .state_renewal_ops = &nfs40_state_renewal_ops,
5416 };
5417
5418 #if defined(CONFIG_NFS_V4_1)
5419 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
5420         .minor_version = 1,
5421         .call_sync = _nfs4_call_sync_session,
5422         .validate_stateid = nfs41_validate_delegation_stateid,
5423         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
5424         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
5425         .state_renewal_ops = &nfs41_state_renewal_ops,
5426 };
5427 #endif
5428
5429 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
5430         [0] = &nfs_v4_0_minor_ops,
5431 #if defined(CONFIG_NFS_V4_1)
5432         [1] = &nfs_v4_1_minor_ops,
5433 #endif
5434 };
5435
5436 static const struct inode_operations nfs4_file_inode_operations = {
5437         .permission     = nfs_permission,
5438         .getattr        = nfs_getattr,
5439         .setattr        = nfs_setattr,
5440         .getxattr       = nfs4_getxattr,
5441         .setxattr       = nfs4_setxattr,
5442         .listxattr      = nfs4_listxattr,
5443 };
5444
5445 const struct nfs_rpc_ops nfs_v4_clientops = {
5446         .version        = 4,                    /* protocol version */
5447         .dentry_ops     = &nfs4_dentry_operations,
5448         .dir_inode_ops  = &nfs4_dir_inode_operations,
5449         .file_inode_ops = &nfs4_file_inode_operations,
5450         .getroot        = nfs4_proc_get_root,
5451         .getattr        = nfs4_proc_getattr,
5452         .setattr        = nfs4_proc_setattr,
5453         .lookupfh       = nfs4_proc_lookupfh,
5454         .lookup         = nfs4_proc_lookup,
5455         .access         = nfs4_proc_access,
5456         .readlink       = nfs4_proc_readlink,
5457         .create         = nfs4_proc_create,
5458         .remove         = nfs4_proc_remove,
5459         .unlink_setup   = nfs4_proc_unlink_setup,
5460         .unlink_done    = nfs4_proc_unlink_done,
5461         .rename         = nfs4_proc_rename,
5462         .link           = nfs4_proc_link,
5463         .symlink        = nfs4_proc_symlink,
5464         .mkdir          = nfs4_proc_mkdir,
5465         .rmdir          = nfs4_proc_remove,
5466         .readdir        = nfs4_proc_readdir,
5467         .mknod          = nfs4_proc_mknod,
5468         .statfs         = nfs4_proc_statfs,
5469         .fsinfo         = nfs4_proc_fsinfo,
5470         .pathconf       = nfs4_proc_pathconf,
5471         .set_capabilities = nfs4_server_capabilities,
5472         .decode_dirent  = nfs4_decode_dirent,
5473         .read_setup     = nfs4_proc_read_setup,
5474         .read_done      = nfs4_read_done,
5475         .write_setup    = nfs4_proc_write_setup,
5476         .write_done     = nfs4_write_done,
5477         .commit_setup   = nfs4_proc_commit_setup,
5478         .commit_done    = nfs4_commit_done,
5479         .lock           = nfs4_proc_lock,
5480         .clear_acl_cache = nfs4_zap_acl_attr,
5481         .close_context  = nfs4_close_context,
5482 };
5483
5484 /*
5485  * Local variables:
5486  *  c-basic-offset: 8
5487  * End:
5488  */