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/sunrpc/clnt.h>
  43 #include <linux/nfs.h>
  44 #include <linux/nfs4.h>
  45 #include <linux/nfs_fs.h>
  46 #include <linux/nfs_page.h>
  47 #include <linux/namei.h>
  48 #include <linux/mount.h>
  49 #include <linux/module.h>
  50 #include <linux/sunrpc/bc_xprt.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "internal.h"
  55 #include "iostat.h"
  56 #include "callback.h"
  57
  58 #define NFSDBG_FACILITY         NFSDBG_PROC
  59
  60 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  61 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  62
  63 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  64
  65 struct nfs4_opendata;
  66 static int _nfs4_proc_open(struct nfs4_opendata *data);
  67 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  68 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  69 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  70 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  71
  72 /* Prevent leaks of NFSv4 errors into userland */
  73 static int nfs4_map_errors(int err)
  74 {
  75         if (err >= -1000)
  76                 return err;
  77         switch (err) {
  78         case -NFS4ERR_RESOURCE:
  79                 return -EREMOTEIO;
  80         default:
  81                 dprintk("%s could not handle NFSv4 error %d\n",
  82                                 __func__, -err);
  83                 break;
  84         }
  85         return -EIO;
  86 }
  87
  88 /*
  89  * This is our standard bitmap for GETATTR requests.
  90  */
  91 const u32 nfs4_fattr_bitmap[2] = {
  92         FATTR4_WORD0_TYPE
  93         | FATTR4_WORD0_CHANGE
  94         | FATTR4_WORD0_SIZE
  95         | FATTR4_WORD0_FSID
  96         | FATTR4_WORD0_FILEID,
  97         FATTR4_WORD1_MODE
  98         | FATTR4_WORD1_NUMLINKS
  99         | FATTR4_WORD1_OWNER
 100         | FATTR4_WORD1_OWNER_GROUP
 101         | FATTR4_WORD1_RAWDEV
 102         | FATTR4_WORD1_SPACE_USED
 103         | FATTR4_WORD1_TIME_ACCESS
 104         | FATTR4_WORD1_TIME_METADATA
 105         | FATTR4_WORD1_TIME_MODIFY
 106 };
 107
 108 const u32 nfs4_statfs_bitmap[2] = {
 109         FATTR4_WORD0_FILES_AVAIL
 110         | FATTR4_WORD0_FILES_FREE
 111         | FATTR4_WORD0_FILES_TOTAL,
 112         FATTR4_WORD1_SPACE_AVAIL
 113         | FATTR4_WORD1_SPACE_FREE
 114         | FATTR4_WORD1_SPACE_TOTAL
 115 };
 116
 117 const u32 nfs4_pathconf_bitmap[2] = {
 118         FATTR4_WORD0_MAXLINK
 119         | FATTR4_WORD0_MAXNAME,
 120         0
 121 };
 122
 123 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 124                         | FATTR4_WORD0_MAXREAD
 125                         | FATTR4_WORD0_MAXWRITE
 126                         | FATTR4_WORD0_LEASE_TIME,
 127                         0
 128 };
 129
 130 const u32 nfs4_fs_locations_bitmap[2] = {
 131         FATTR4_WORD0_TYPE
 132         | FATTR4_WORD0_CHANGE
 133         | FATTR4_WORD0_SIZE
 134         | FATTR4_WORD0_FSID
 135         | FATTR4_WORD0_FILEID
 136         | FATTR4_WORD0_FS_LOCATIONS,
 137         FATTR4_WORD1_MODE
 138         | FATTR4_WORD1_NUMLINKS
 139         | FATTR4_WORD1_OWNER
 140         | FATTR4_WORD1_OWNER_GROUP
 141         | FATTR4_WORD1_RAWDEV
 142         | FATTR4_WORD1_SPACE_USED
 143         | FATTR4_WORD1_TIME_ACCESS
 144         | FATTR4_WORD1_TIME_METADATA
 145         | FATTR4_WORD1_TIME_MODIFY
 146         | FATTR4_WORD1_MOUNTED_ON_FILEID
 147 };
 148
 149 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 150                 struct nfs4_readdir_arg *readdir)
 151 {
 152         __be32 *start, *p;
 153
 154         BUG_ON(readdir->count < 80);
 155         if (cookie > 2) {
 156                 readdir->cookie = cookie;
 157                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 158                 return;
 159         }
 160
 161         readdir->cookie = 0;
 162         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 163         if (cookie == 2)
 164                 return;
 165
 166         /*
 167          * NFSv4 servers do not return entries for '.' and '..'
 168          * Therefore, we fake these entries here.  We let '.'
 169          * have cookie 0 and '..' have cookie 1.  Note that
 170          * when talking to the server, we always send cookie 0
 171          * instead of 1 or 2.
 172          */
 173         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 174
 175         if (cookie == 0) {
 176                 *p++ = xdr_one;                                  /* next */
 177                 *p++ = xdr_zero;                   /* cookie, first word */
 178                 *p++ = xdr_one;                   /* cookie, second word */
 179                 *p++ = xdr_one;                             /* entry len */
 180                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 181                 p++;
 182                 *p++ = xdr_one;                         /* bitmap length */
 183                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 184                 *p++ = htonl(8);              /* attribute buffer length */
 185                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 186         }
 187
 188         *p++ = xdr_one;                                  /* next */
 189         *p++ = xdr_zero;                   /* cookie, first word */
 190         *p++ = xdr_two;                   /* cookie, second word */
 191         *p++ = xdr_two;                             /* entry len */
 192         memcpy(p, "..\0\0", 4);                         /* entry */
 193         p++;
 194         *p++ = xdr_one;                         /* bitmap length */
 195         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 196         *p++ = htonl(8);              /* attribute buffer length */
 197         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 198
 199         readdir->pgbase = (char *)p - (char *)start;
 200         readdir->count -= readdir->pgbase;
 201         kunmap_atomic(start, KM_USER0);
 202 }
 203
 204 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 205 {
 206         int res;
 207
 208         might_sleep();
 209
 210         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 211                         nfs_wait_bit_killable, TASK_KILLABLE);
 212         return res;
 213 }
 214
 215 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 216 {
 217         int res = 0;
 218
 219         might_sleep();
 220
 221         if (*timeout <= 0)
 222                 *timeout = NFS4_POLL_RETRY_MIN;
 223         if (*timeout > NFS4_POLL_RETRY_MAX)
 224                 *timeout = NFS4_POLL_RETRY_MAX;
 225         schedule_timeout_killable(*timeout);
 226         if (fatal_signal_pending(current))
 227                 res = -ERESTARTSYS;
 228         *timeout <<= 1;
 229         return res;
 230 }
 231
 232 /* This is the error handling routine for processes that are allowed
 233  * to sleep.
 234  */
 235 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 236 {
 237         struct nfs_client *clp = server->nfs_client;
 238         struct nfs4_state *state = exception->state;
 239         int ret = errorcode;
 240
 241         exception->retry = 0;
 242         switch(errorcode) {
 243                 case 0:
 244                         return 0;
 245                 case -NFS4ERR_ADMIN_REVOKED:
 246                 case -NFS4ERR_BAD_STATEID:
 247                 case -NFS4ERR_OPENMODE:
 248                         if (state == NULL)
 249                                 break;
 250                         nfs4_state_mark_reclaim_nograce(clp, state);
 251                 case -NFS4ERR_STALE_CLIENTID:
 252                 case -NFS4ERR_STALE_STATEID:
 253                 case -NFS4ERR_EXPIRED:
 254                         nfs4_schedule_state_recovery(clp);
 255                         ret = nfs4_wait_clnt_recover(clp);
 256                         if (ret == 0)
 257                                 exception->retry = 1;
 258 #if !defined(CONFIG_NFS_V4_1)
 259                         break;
 260 #else /* !defined(CONFIG_NFS_V4_1) */
 261                         if (!nfs4_has_session(server->nfs_client))
 262                                 break;
 263                         /* FALLTHROUGH */
 264                 case -NFS4ERR_BADSESSION:
 265                 case -NFS4ERR_BADSLOT:
 266                 case -NFS4ERR_BAD_HIGH_SLOT:
 267                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 268                 case -NFS4ERR_DEADSESSION:
 269                 case -NFS4ERR_SEQ_FALSE_RETRY:
 270                 case -NFS4ERR_SEQ_MISORDERED:
 271                         dprintk("%s ERROR: %d Reset session\n", __func__,
 272                                 errorcode);
 273                         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
 274                         exception->retry = 1;
 275                         break;
 276 #endif /* !defined(CONFIG_NFS_V4_1) */
 277                 case -NFS4ERR_FILE_OPEN:
 278                         if (exception->timeout > HZ) {
 279                                 /* We have retried a decent amount, time to
 280                                  * fail
 281                                  */
 282                                 ret = -EBUSY;
 283                                 break;
 284                         }
 285                 case -NFS4ERR_GRACE:
 286                 case -NFS4ERR_DELAY:
 287                         ret = nfs4_delay(server->client, &exception->timeout);
 288                         if (ret != 0)
 289                                 break;
 290                 case -NFS4ERR_OLD_STATEID:
 291                         exception->retry = 1;
 292         }
 293         /* We failed to handle the error */
 294         return nfs4_map_errors(ret);
 295 }
 296
 297
 298 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 299 {
 300         struct nfs_client *clp = server->nfs_client;
 301         spin_lock(&clp->cl_lock);
 302         if (time_before(clp->cl_last_renewal,timestamp))
 303                 clp->cl_last_renewal = timestamp;
 304         spin_unlock(&clp->cl_lock);
 305 }
 306
 307 #if defined(CONFIG_NFS_V4_1)
 308
 309 /*
 310  * nfs4_free_slot - free a slot and efficiently update slot table.
 311  *
 312  * freeing a slot is trivially done by clearing its respective bit
 313  * in the bitmap.
 314  * If the freed slotid equals highest_used_slotid we want to update it
 315  * so that the server would be able to size down the slot table if needed,
 316  * otherwise we know that the highest_used_slotid is still in use.
 317  * When updating highest_used_slotid there may be "holes" in the bitmap
 318  * so we need to scan down from highest_used_slotid to 0 looking for the now
 319  * highest slotid in use.
 320  * If none found, highest_used_slotid is set to -1.
 321  */
 322 static void
 323 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 324 {
 325         int slotid = free_slotid;
 326
 327         spin_lock(&tbl->slot_tbl_lock);
 328         /* clear used bit in bitmap */
 329         __clear_bit(slotid, tbl->used_slots);
 330
 331         /* update highest_used_slotid when it is freed */
 332         if (slotid == tbl->highest_used_slotid) {
 333                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 334                 if (slotid >= 0 && slotid < tbl->max_slots)
 335                         tbl->highest_used_slotid = slotid;
 336                 else
 337                         tbl->highest_used_slotid = -1;
 338         }
 339         rpc_wake_up_next(&tbl->slot_tbl_waitq);
 340         spin_unlock(&tbl->slot_tbl_lock);
 341         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 342                 free_slotid, tbl->highest_used_slotid);
 343 }
 344
 345 void nfs41_sequence_free_slot(const struct nfs_client *clp,
 346                               struct nfs4_sequence_res *res)
 347 {
 348         struct nfs4_slot_table *tbl;
 349
 350         if (!nfs4_has_session(clp)) {
 351                 dprintk("%s: No session\n", __func__);
 352                 return;
 353         }
 354         tbl = &clp->cl_session->fc_slot_table;
 355         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
 356                 dprintk("%s: No slot\n", __func__);
 357                 /* just wake up the next guy waiting since
 358                  * we may have not consumed a slot after all */
 359                 rpc_wake_up_next(&tbl->slot_tbl_waitq);
 360                 return;
 361         }
 362         nfs4_free_slot(tbl, res->sr_slotid);
 363         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 364 }
 365
 366 static void nfs41_sequence_done(struct nfs_client *clp,
 367                                 struct nfs4_sequence_res *res,
 368                                 int rpc_status)
 369 {
 370         unsigned long timestamp;
 371         struct nfs4_slot_table *tbl;
 372         struct nfs4_slot *slot;
 373
 374         /*
 375          * sr_status remains 1 if an RPC level error occurred. The server
 376          * may or may not have processed the sequence operation..
 377          * Proceed as if the server received and processed the sequence
 378          * operation.
 379          */
 380         if (res->sr_status == 1)
 381                 res->sr_status = NFS_OK;
 382
 383         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 384         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
 385                 goto out;
 386
 387         tbl = &clp->cl_session->fc_slot_table;
 388         slot = tbl->slots + res->sr_slotid;
 389
 390         if (res->sr_status == 0) {
 391                 /* Update the slot's sequence and clientid lease timer */
 392                 ++slot->seq_nr;
 393                 timestamp = res->sr_renewal_time;
 394                 spin_lock(&clp->cl_lock);
 395                 if (time_before(clp->cl_last_renewal, timestamp))
 396                         clp->cl_last_renewal = timestamp;
 397                 spin_unlock(&clp->cl_lock);
 398                 return;
 399         }
 400 out:
 401         /* The session may be reset by one of the error handlers. */
 402         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 403         nfs41_sequence_free_slot(clp, res);
 404 }
 405
 406 /*
 407  * nfs4_find_slot - efficiently look for a free slot
 408  *
 409  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 410  * If found, we mark the slot as used, update the highest_used_slotid,
 411  * and respectively set up the sequence operation args.
 412  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 413  *
 414  * Note: must be called with under the slot_tbl_lock.
 415  */
 416 static u8
 417 nfs4_find_slot(struct nfs4_slot_table *tbl, struct rpc_task *task)
 418 {
 419         int slotid;
 420         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 421         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 422
 423         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 424                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 425                 tbl->max_slots);
 426         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 427         if (slotid >= tbl->max_slots)
 428                 goto out;
 429         __set_bit(slotid, tbl->used_slots);
 430         if (slotid > tbl->highest_used_slotid)
 431                 tbl->highest_used_slotid = slotid;
 432         ret_id = slotid;
 433 out:
 434         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 435                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 436         return ret_id;
 437 }
 438
 439 static int nfs4_recover_session(struct nfs4_session *session)
 440 {
 441         struct nfs_client *clp = session->clp;
 442         unsigned int loop;
 443         int ret;
 444
 445         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
 446                 ret = nfs4_wait_clnt_recover(clp);
 447                 if (ret != 0)
 448                         break;
 449                 if (!test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
 450                         break;
 451                 nfs4_schedule_state_manager(clp);
 452                 ret = -EIO;
 453         }
 454         return ret;
 455 }
 456
 457 static int nfs41_setup_sequence(struct nfs4_session *session,
 458                                 struct nfs4_sequence_args *args,
 459                                 struct nfs4_sequence_res *res,
 460                                 int cache_reply,
 461                                 struct rpc_task *task)
 462 {
 463         struct nfs4_slot *slot;
 464         struct nfs4_slot_table *tbl;
 465         int status = 0;
 466         u8 slotid;
 467
 468         dprintk("--> %s\n", __func__);
 469         /* slot already allocated? */
 470         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
 471                 return 0;
 472
 473         memset(res, 0, sizeof(*res));
 474         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 475         tbl = &session->fc_slot_table;
 476
 477         spin_lock(&tbl->slot_tbl_lock);
 478         if (test_bit(NFS4CLNT_SESSION_RESET, &session->clp->cl_state)) {
 479                 if (tbl->highest_used_slotid != -1) {
 480                         rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 481                         spin_unlock(&tbl->slot_tbl_lock);
 482                         dprintk("<-- %s: Session reset: draining\n", __func__);
 483                         return -EAGAIN;
 484                 }
 485
 486                 /* The slot table is empty; start the reset thread */
 487                 dprintk("%s Session Reset\n", __func__);
 488                 spin_unlock(&tbl->slot_tbl_lock);
 489                 status = nfs4_recover_session(session);
 490                 if (status)
 491                         return status;
 492                 spin_lock(&tbl->slot_tbl_lock);
 493         }
 494
 495         slotid = nfs4_find_slot(tbl, task);
 496         if (slotid == NFS4_MAX_SLOT_TABLE) {
 497                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 498                 spin_unlock(&tbl->slot_tbl_lock);
 499                 dprintk("<-- %s: no free slots\n", __func__);
 500                 return -EAGAIN;
 501         }
 502         spin_unlock(&tbl->slot_tbl_lock);
 503
 504         slot = tbl->slots + slotid;
 505         args->sa_session = session;
 506         args->sa_slotid = slotid;
 507         args->sa_cache_this = cache_reply;
 508
 509         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 510
 511         res->sr_session = session;
 512         res->sr_slotid = slotid;
 513         res->sr_renewal_time = jiffies;
 514         /*
 515          * sr_status is only set in decode_sequence, and so will remain
 516          * set to 1 if an rpc level failure occurs.
 517          */
 518         res->sr_status = 1;
 519         return 0;
 520 }
 521
 522 int nfs4_setup_sequence(struct nfs_client *clp,
 523                         struct nfs4_sequence_args *args,
 524                         struct nfs4_sequence_res *res,
 525                         int cache_reply,
 526                         struct rpc_task *task)
 527 {
 528         int ret = 0;
 529
 530         dprintk("--> %s clp %p session %p sr_slotid %d\n",
 531                 __func__, clp, clp->cl_session, res->sr_slotid);
 532
 533         if (!nfs4_has_session(clp))
 534                 goto out;
 535         ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
 536                                    task);
 537         if (ret != -EAGAIN) {
 538                 /* terminate rpc task */
 539                 task->tk_status = ret;
 540                 task->tk_action = NULL;
 541         }
 542 out:
 543         dprintk("<-- %s status=%d\n", __func__, ret);
 544         return ret;
 545 }
 546
 547 struct nfs41_call_sync_data {
 548         struct nfs_client *clp;
 549         struct nfs4_sequence_args *seq_args;
 550         struct nfs4_sequence_res *seq_res;
 551         int cache_reply;
 552 };
 553
 554 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 555 {
 556         struct nfs41_call_sync_data *data = calldata;
 557
 558         dprintk("--> %s data->clp->cl_session %p\n", __func__,
 559                 data->clp->cl_session);
 560         if (nfs4_setup_sequence(data->clp, data->seq_args,
 561                                 data->seq_res, data->cache_reply, task))
 562                 return;
 563         rpc_call_start(task);
 564 }
 565
 566 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 567 {
 568         struct nfs41_call_sync_data *data = calldata;
 569
 570         nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
 571         nfs41_sequence_free_slot(data->clp, data->seq_res);
 572 }
 573
 574 struct rpc_call_ops nfs41_call_sync_ops = {
 575         .rpc_call_prepare = nfs41_call_sync_prepare,
 576         .rpc_call_done = nfs41_call_sync_done,
 577 };
 578
 579 static int nfs4_call_sync_sequence(struct nfs_client *clp,
 580                                    struct rpc_clnt *clnt,
 581                                    struct rpc_message *msg,
 582                                    struct nfs4_sequence_args *args,
 583                                    struct nfs4_sequence_res *res,
 584                                    int cache_reply)
 585 {
 586         int ret;
 587         struct rpc_task *task;
 588         struct nfs41_call_sync_data data = {
 589                 .clp = clp,
 590                 .seq_args = args,
 591                 .seq_res = res,
 592                 .cache_reply = cache_reply,
 593         };
 594         struct rpc_task_setup task_setup = {
 595                 .rpc_client = clnt,
 596                 .rpc_message = msg,
 597                 .callback_ops = &nfs41_call_sync_ops,
 598                 .callback_data = &data
 599         };
 600
 601         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 602         task = rpc_run_task(&task_setup);
 603         if (IS_ERR(task))
 604                 ret = PTR_ERR(task);
 605         else {
 606                 ret = task->tk_status;
 607                 rpc_put_task(task);
 608         }
 609         return ret;
 610 }
 611
 612 int _nfs4_call_sync_session(struct nfs_server *server,
 613                             struct rpc_message *msg,
 614                             struct nfs4_sequence_args *args,
 615                             struct nfs4_sequence_res *res,
 616                             int cache_reply)
 617 {
 618         return nfs4_call_sync_sequence(server->nfs_client, server->client,
 619                                        msg, args, res, cache_reply);
 620 }
 621
 622 #endif /* CONFIG_NFS_V4_1 */
 623
 624 int _nfs4_call_sync(struct nfs_server *server,
 625                     struct rpc_message *msg,
 626                     struct nfs4_sequence_args *args,
 627                     struct nfs4_sequence_res *res,
 628                     int cache_reply)
 629 {
 630         args->sa_session = res->sr_session = NULL;
 631         return rpc_call_sync(server->client, msg, 0);
 632 }
 633
 634 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 635         (server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
 636                         &(res)->seq_res, (cache_reply))
 637
 638 static void nfs4_sequence_done(const struct nfs_server *server,
 639                                struct nfs4_sequence_res *res, int rpc_status)
 640 {
 641 #ifdef CONFIG_NFS_V4_1
 642         if (nfs4_has_session(server->nfs_client))
 643                 nfs41_sequence_done(server->nfs_client, res, rpc_status);
 644 #endif /* CONFIG_NFS_V4_1 */
 645 }
 646
 647 void nfs4_restart_rpc(struct rpc_task *task, const struct nfs_client *clp,
 648                       struct nfs4_sequence_res *res)
 649 {
 650 #ifdef CONFIG_NFS_V4_1
 651         if (nfs4_has_session(clp)) {
 652                 nfs41_sequence_free_slot(clp, res);
 653                 rpc_restart_call_prepare(task);
 654                 return;
 655         }
 656 #endif /* CONFIG_NFS_V4_1 */
 657         rpc_restart_call(task);
 658 }
 659
 660 /* no restart, therefore free slot here */
 661 static void nfs4_sequence_done_free_slot(const struct nfs_server *server,
 662                                          struct nfs4_sequence_res *res,
 663                                          int rpc_status)
 664 {
 665         nfs4_sequence_done(server, res, rpc_status);
 666         nfs4_sequence_free_slot(server->nfs_client, res);
 667 }
 668
 669 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 670 {
 671         struct nfs_inode *nfsi = NFS_I(dir);
 672
 673         spin_lock(&dir->i_lock);
 674         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 675         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 676                 nfs_force_lookup_revalidate(dir);
 677         nfsi->change_attr = cinfo->after;
 678         spin_unlock(&dir->i_lock);
 679 }
 680
 681 struct nfs4_opendata {
 682         struct kref kref;
 683         struct nfs_openargs o_arg;
 684         struct nfs_openres o_res;
 685         struct nfs_open_confirmargs c_arg;
 686         struct nfs_open_confirmres c_res;
 687         struct nfs_fattr f_attr;
 688         struct nfs_fattr dir_attr;
 689         struct path path;
 690         struct dentry *dir;
 691         struct nfs4_state_owner *owner;
 692         struct nfs4_state *state;
 693         struct iattr attrs;
 694         unsigned long timestamp;
 695         unsigned int rpc_done : 1;
 696         int rpc_status;
 697         int cancelled;
 698 };
 699
 700
 701 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 702 {
 703         p->o_res.f_attr = &p->f_attr;
 704         p->o_res.dir_attr = &p->dir_attr;
 705         p->o_res.seqid = p->o_arg.seqid;
 706         p->c_res.seqid = p->c_arg.seqid;
 707         p->o_res.server = p->o_arg.server;
 708         nfs_fattr_init(&p->f_attr);
 709         nfs_fattr_init(&p->dir_attr);
 710         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
 711 }
 712
 713 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 714                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 715                 const struct iattr *attrs)
 716 {
 717         struct dentry *parent = dget_parent(path->dentry);
 718         struct inode *dir = parent->d_inode;
 719         struct nfs_server *server = NFS_SERVER(dir);
 720         struct nfs4_opendata *p;
 721
 722         p = kzalloc(sizeof(*p), GFP_KERNEL);
 723         if (p == NULL)
 724                 goto err;
 725         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 726         if (p->o_arg.seqid == NULL)
 727                 goto err_free;
 728         p->path.mnt = mntget(path->mnt);
 729         p->path.dentry = dget(path->dentry);
 730         p->dir = parent;
 731         p->owner = sp;
 732         atomic_inc(&sp->so_count);
 733         p->o_arg.fh = NFS_FH(dir);
 734         p->o_arg.open_flags = flags;
 735         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 736         p->o_arg.clientid = server->nfs_client->cl_clientid;
 737         p->o_arg.id = sp->so_owner_id.id;
 738         p->o_arg.name = &p->path.dentry->d_name;
 739         p->o_arg.server = server;
 740         p->o_arg.bitmask = server->attr_bitmask;
 741         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 742         if (flags & O_EXCL) {
 743                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 744                 s[0] = jiffies;
 745                 s[1] = current->pid;
 746         } else if (flags & O_CREAT) {
 747                 p->o_arg.u.attrs = &p->attrs;
 748                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 749         }
 750         p->c_arg.fh = &p->o_res.fh;
 751         p->c_arg.stateid = &p->o_res.stateid;
 752         p->c_arg.seqid = p->o_arg.seqid;
 753         nfs4_init_opendata_res(p);
 754         kref_init(&p->kref);
 755         return p;
 756 err_free:
 757         kfree(p);
 758 err:
 759         dput(parent);
 760         return NULL;
 761 }
 762
 763 static void nfs4_opendata_free(struct kref *kref)
 764 {
 765         struct nfs4_opendata *p = container_of(kref,
 766                         struct nfs4_opendata, kref);
 767
 768         nfs_free_seqid(p->o_arg.seqid);
 769         if (p->state != NULL)
 770                 nfs4_put_open_state(p->state);
 771         nfs4_put_state_owner(p->owner);
 772         dput(p->dir);
 773         path_put(&p->path);
 774         kfree(p);
 775 }
 776
 777 static void nfs4_opendata_put(struct nfs4_opendata *p)
 778 {
 779         if (p != NULL)
 780                 kref_put(&p->kref, nfs4_opendata_free);
 781 }
 782
 783 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 784 {
 785         int ret;
 786
 787         ret = rpc_wait_for_completion_task(task);
 788         return ret;
 789 }
 790
 791 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 792 {
 793         int ret = 0;
 794
 795         if (open_mode & O_EXCL)
 796                 goto out;
 797         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 798                 case FMODE_READ:
 799                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 800                         break;
 801                 case FMODE_WRITE:
 802                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 803                         break;
 804                 case FMODE_READ|FMODE_WRITE:
 805                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 806         }
 807 out:
 808         return ret;
 809 }
 810
 811 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 812 {
 813         if ((delegation->type & fmode) != fmode)
 814                 return 0;
 815         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 816                 return 0;
 817         nfs_mark_delegation_referenced(delegation);
 818         return 1;
 819 }
 820
 821 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 822 {
 823         switch (fmode) {
 824                 case FMODE_WRITE:
 825                         state->n_wronly++;
 826                         break;
 827                 case FMODE_READ:
 828                         state->n_rdonly++;
 829                         break;
 830                 case FMODE_READ|FMODE_WRITE:
 831                         state->n_rdwr++;
 832         }
 833         nfs4_state_set_mode_locked(state, state->state | fmode);
 834 }
 835
 836 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 837 {
 838         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 839                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 840         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 841         switch (fmode) {
 842                 case FMODE_READ:
 843                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 844                         break;
 845                 case FMODE_WRITE:
 846                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 847                         break;
 848                 case FMODE_READ|FMODE_WRITE:
 849                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 850         }
 851 }
 852
 853 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 854 {
 855         write_seqlock(&state->seqlock);
 856         nfs_set_open_stateid_locked(state, stateid, fmode);
 857         write_sequnlock(&state->seqlock);
 858 }
 859
 860 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 861 {
 862         /*
 863          * Protect the call to nfs4_state_set_mode_locked and
 864          * serialise the stateid update
 865          */
 866         write_seqlock(&state->seqlock);
 867         if (deleg_stateid != NULL) {
 868                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 869                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 870         }
 871         if (open_stateid != NULL)
 872                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 873         write_sequnlock(&state->seqlock);
 874         spin_lock(&state->owner->so_lock);
 875         update_open_stateflags(state, fmode);
 876         spin_unlock(&state->owner->so_lock);
 877 }
 878
 879 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 880 {
 881         struct nfs_inode *nfsi = NFS_I(state->inode);
 882         struct nfs_delegation *deleg_cur;
 883         int ret = 0;
 884
 885         fmode &= (FMODE_READ|FMODE_WRITE);
 886
 887         rcu_read_lock();
 888         deleg_cur = rcu_dereference(nfsi->delegation);
 889         if (deleg_cur == NULL)
 890                 goto no_delegation;
 891
 892         spin_lock(&deleg_cur->lock);
 893         if (nfsi->delegation != deleg_cur ||
 894             (deleg_cur->type & fmode) != fmode)
 895                 goto no_delegation_unlock;
 896
 897         if (delegation == NULL)
 898                 delegation = &deleg_cur->stateid;
 899         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 900                 goto no_delegation_unlock;
 901
 902         nfs_mark_delegation_referenced(deleg_cur);
 903         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 904         ret = 1;
 905 no_delegation_unlock:
 906         spin_unlock(&deleg_cur->lock);
 907 no_delegation:
 908         rcu_read_unlock();
 909
 910         if (!ret && open_stateid != NULL) {
 911                 __update_open_stateid(state, open_stateid, NULL, fmode);
 912                 ret = 1;
 913         }
 914
 915         return ret;
 916 }
 917
 918
 919 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 920 {
 921         struct nfs_delegation *delegation;
 922
 923         rcu_read_lock();
 924         delegation = rcu_dereference(NFS_I(inode)->delegation);
 925         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 926                 rcu_read_unlock();
 927                 return;
 928         }
 929         rcu_read_unlock();
 930         nfs_inode_return_delegation(inode);
 931 }
 932
 933 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 934 {
 935         struct nfs4_state *state = opendata->state;
 936         struct nfs_inode *nfsi = NFS_I(state->inode);
 937         struct nfs_delegation *delegation;
 938         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 939         fmode_t fmode = opendata->o_arg.fmode;
 940         nfs4_stateid stateid;
 941         int ret = -EAGAIN;
 942
 943         for (;;) {
 944                 if (can_open_cached(state, fmode, open_mode)) {
 945                         spin_lock(&state->owner->so_lock);
 946                         if (can_open_cached(state, fmode, open_mode)) {
 947                                 update_open_stateflags(state, fmode);
 948                                 spin_unlock(&state->owner->so_lock);
 949                                 goto out_return_state;
 950                         }
 951                         spin_unlock(&state->owner->so_lock);
 952                 }
 953                 rcu_read_lock();
 954                 delegation = rcu_dereference(nfsi->delegation);
 955                 if (delegation == NULL ||
 956                     !can_open_delegated(delegation, fmode)) {
 957                         rcu_read_unlock();
 958                         break;
 959                 }
 960                 /* Save the delegation */
 961                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 962                 rcu_read_unlock();
 963                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 964                 if (ret != 0)
 965                         goto out;
 966                 ret = -EAGAIN;
 967
 968                 /* Try to update the stateid using the delegation */
 969                 if (update_open_stateid(state, NULL, &stateid, fmode))
 970                         goto out_return_state;
 971         }
 972 out:
 973         return ERR_PTR(ret);
 974 out_return_state:
 975         atomic_inc(&state->count);
 976         return state;
 977 }
 978
 979 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 980 {
 981         struct inode *inode;
 982         struct nfs4_state *state = NULL;
 983         struct nfs_delegation *delegation;
 984         int ret;
 985
 986         if (!data->rpc_done) {
 987                 state = nfs4_try_open_cached(data);
 988                 goto out;
 989         }
 990
 991         ret = -EAGAIN;
 992         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 993                 goto err;
 994         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 995         ret = PTR_ERR(inode);
 996         if (IS_ERR(inode))
 997                 goto err;
 998         ret = -ENOMEM;
 999         state = nfs4_get_open_state(inode, data->owner);
1000         if (state == NULL)
1001                 goto err_put_inode;
1002         if (data->o_res.delegation_type != 0) {
1003                 int delegation_flags = 0;
1004
1005                 rcu_read_lock();
1006                 delegation = rcu_dereference(NFS_I(inode)->delegation);
1007                 if (delegation)
1008                         delegation_flags = delegation->flags;
1009                 rcu_read_unlock();
1010                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1011                         nfs_inode_set_delegation(state->inode,
1012                                         data->owner->so_cred,
1013                                         &data->o_res);
1014                 else
1015                         nfs_inode_reclaim_delegation(state->inode,
1016                                         data->owner->so_cred,
1017                                         &data->o_res);
1018         }
1019
1020         update_open_stateid(state, &data->o_res.stateid, NULL,
1021                         data->o_arg.fmode);
1022         iput(inode);
1023 out:
1024         return state;
1025 err_put_inode:
1026         iput(inode);
1027 err:
1028         return ERR_PTR(ret);
1029 }
1030
1031 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1032 {
1033         struct nfs_inode *nfsi = NFS_I(state->inode);
1034         struct nfs_open_context *ctx;
1035
1036         spin_lock(&state->inode->i_lock);
1037         list_for_each_entry(ctx, &nfsi->open_files, list) {
1038                 if (ctx->state != state)
1039                         continue;
1040                 get_nfs_open_context(ctx);
1041                 spin_unlock(&state->inode->i_lock);
1042                 return ctx;
1043         }
1044         spin_unlock(&state->inode->i_lock);
1045         return ERR_PTR(-ENOENT);
1046 }
1047
1048 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1049 {
1050         struct nfs4_opendata *opendata;
1051
1052         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
1053         if (opendata == NULL)
1054                 return ERR_PTR(-ENOMEM);
1055         opendata->state = state;
1056         atomic_inc(&state->count);
1057         return opendata;
1058 }
1059
1060 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1061 {
1062         struct nfs4_state *newstate;
1063         int ret;
1064
1065         opendata->o_arg.open_flags = 0;
1066         opendata->o_arg.fmode = fmode;
1067         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1068         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1069         nfs4_init_opendata_res(opendata);
1070         ret = _nfs4_proc_open(opendata);
1071         if (ret != 0)
1072                 return ret;
1073         newstate = nfs4_opendata_to_nfs4_state(opendata);
1074         if (IS_ERR(newstate))
1075                 return PTR_ERR(newstate);
1076         nfs4_close_state(&opendata->path, newstate, fmode);
1077         *res = newstate;
1078         return 0;
1079 }
1080
1081 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1082 {
1083         struct nfs4_state *newstate;
1084         int ret;
1085
1086         /* memory barrier prior to reading state->n_* */
1087         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1088         smp_rmb();
1089         if (state->n_rdwr != 0) {
1090                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1091                 if (ret != 0)
1092                         return ret;
1093                 if (newstate != state)
1094                         return -ESTALE;
1095         }
1096         if (state->n_wronly != 0) {
1097                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1098                 if (ret != 0)
1099                         return ret;
1100                 if (newstate != state)
1101                         return -ESTALE;
1102         }
1103         if (state->n_rdonly != 0) {
1104                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1105                 if (ret != 0)
1106                         return ret;
1107                 if (newstate != state)
1108                         return -ESTALE;
1109         }
1110         /*
1111          * We may have performed cached opens for all three recoveries.
1112          * Check if we need to update the current stateid.
1113          */
1114         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1115             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1116                 write_seqlock(&state->seqlock);
1117                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1118                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1119                 write_sequnlock(&state->seqlock);
1120         }
1121         return 0;
1122 }
1123
1124 /*
1125  * OPEN_RECLAIM:
1126  *      reclaim state on the server after a reboot.
1127  */
1128 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1129 {
1130         struct nfs_delegation *delegation;
1131         struct nfs4_opendata *opendata;
1132         fmode_t delegation_type = 0;
1133         int status;
1134
1135         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1136         if (IS_ERR(opendata))
1137                 return PTR_ERR(opendata);
1138         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1139         opendata->o_arg.fh = NFS_FH(state->inode);
1140         rcu_read_lock();
1141         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1142         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1143                 delegation_type = delegation->type;
1144         rcu_read_unlock();
1145         opendata->o_arg.u.delegation_type = delegation_type;
1146         status = nfs4_open_recover(opendata, state);
1147         nfs4_opendata_put(opendata);
1148         return status;
1149 }
1150
1151 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1152 {
1153         struct nfs_server *server = NFS_SERVER(state->inode);
1154         struct nfs4_exception exception = { };
1155         int err;
1156         do {
1157                 err = _nfs4_do_open_reclaim(ctx, state);
1158                 if (err != -NFS4ERR_DELAY)
1159                         break;
1160                 nfs4_handle_exception(server, err, &exception);
1161         } while (exception.retry);
1162         return err;
1163 }
1164
1165 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1166 {
1167         struct nfs_open_context *ctx;
1168         int ret;
1169
1170         ctx = nfs4_state_find_open_context(state);
1171         if (IS_ERR(ctx))
1172                 return PTR_ERR(ctx);
1173         ret = nfs4_do_open_reclaim(ctx, state);
1174         put_nfs_open_context(ctx);
1175         return ret;
1176 }
1177
1178 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1179 {
1180         struct nfs4_opendata *opendata;
1181         int ret;
1182
1183         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1184         if (IS_ERR(opendata))
1185                 return PTR_ERR(opendata);
1186         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1187         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1188                         sizeof(opendata->o_arg.u.delegation.data));
1189         ret = nfs4_open_recover(opendata, state);
1190         nfs4_opendata_put(opendata);
1191         return ret;
1192 }
1193
1194 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1195 {
1196         struct nfs4_exception exception = { };
1197         struct nfs_server *server = NFS_SERVER(state->inode);
1198         int err;
1199         do {
1200                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1201                 switch (err) {
1202                         case 0:
1203                         case -ENOENT:
1204                         case -ESTALE:
1205                                 goto out;
1206                         case -NFS4ERR_STALE_CLIENTID:
1207                         case -NFS4ERR_STALE_STATEID:
1208                         case -NFS4ERR_EXPIRED:
1209                                 /* Don't recall a delegation if it was lost */
1210                                 nfs4_schedule_state_recovery(server->nfs_client);
1211                                 goto out;
1212                         case -ERESTARTSYS:
1213                                 /*
1214                                  * The show must go on: exit, but mark the
1215                                  * stateid as needing recovery.
1216                                  */
1217                         case -NFS4ERR_ADMIN_REVOKED:
1218                         case -NFS4ERR_BAD_STATEID:
1219                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1220                         case -ENOMEM:
1221                                 err = 0;
1222                                 goto out;
1223                 }
1224                 err = nfs4_handle_exception(server, err, &exception);
1225         } while (exception.retry);
1226 out:
1227         return err;
1228 }
1229
1230 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1231 {
1232         struct nfs4_opendata *data = calldata;
1233
1234         data->rpc_status = task->tk_status;
1235         if (RPC_ASSASSINATED(task))
1236                 return;
1237         if (data->rpc_status == 0) {
1238                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1239                                 sizeof(data->o_res.stateid.data));
1240                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1241                 renew_lease(data->o_res.server, data->timestamp);
1242                 data->rpc_done = 1;
1243         }
1244 }
1245
1246 static void nfs4_open_confirm_release(void *calldata)
1247 {
1248         struct nfs4_opendata *data = calldata;
1249         struct nfs4_state *state = NULL;
1250
1251         /* If this request hasn't been cancelled, do nothing */
1252         if (data->cancelled == 0)
1253                 goto out_free;
1254         /* In case of error, no cleanup! */
1255         if (!data->rpc_done)
1256                 goto out_free;
1257         state = nfs4_opendata_to_nfs4_state(data);
1258         if (!IS_ERR(state))
1259                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1260 out_free:
1261         nfs4_opendata_put(data);
1262 }
1263
1264 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1265         .rpc_call_done = nfs4_open_confirm_done,
1266         .rpc_release = nfs4_open_confirm_release,
1267 };
1268
1269 /*
1270  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1271  */
1272 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1273 {
1274         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1275         struct rpc_task *task;
1276         struct  rpc_message msg = {
1277                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1278                 .rpc_argp = &data->c_arg,
1279                 .rpc_resp = &data->c_res,
1280                 .rpc_cred = data->owner->so_cred,
1281         };
1282         struct rpc_task_setup task_setup_data = {
1283                 .rpc_client = server->client,
1284                 .rpc_message = &msg,
1285                 .callback_ops = &nfs4_open_confirm_ops,
1286                 .callback_data = data,
1287                 .workqueue = nfsiod_workqueue,
1288                 .flags = RPC_TASK_ASYNC,
1289         };
1290         int status;
1291
1292         kref_get(&data->kref);
1293         data->rpc_done = 0;
1294         data->rpc_status = 0;
1295         data->timestamp = jiffies;
1296         task = rpc_run_task(&task_setup_data);
1297         if (IS_ERR(task))
1298                 return PTR_ERR(task);
1299         status = nfs4_wait_for_completion_rpc_task(task);
1300         if (status != 0) {
1301                 data->cancelled = 1;
1302                 smp_wmb();
1303         } else
1304                 status = data->rpc_status;
1305         rpc_put_task(task);
1306         return status;
1307 }
1308
1309 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1310 {
1311         struct nfs4_opendata *data = calldata;
1312         struct nfs4_state_owner *sp = data->owner;
1313
1314         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1315                 return;
1316         /*
1317          * Check if we still need to send an OPEN call, or if we can use
1318          * a delegation instead.
1319          */
1320         if (data->state != NULL) {
1321                 struct nfs_delegation *delegation;
1322
1323                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1324                         goto out_no_action;
1325                 rcu_read_lock();
1326                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1327                 if (delegation != NULL &&
1328                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1329                         rcu_read_unlock();
1330                         goto out_no_action;
1331                 }
1332                 rcu_read_unlock();
1333         }
1334         /* Update sequence id. */
1335         data->o_arg.id = sp->so_owner_id.id;
1336         data->o_arg.clientid = sp->so_client->cl_clientid;
1337         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1338                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1339                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1340         }
1341         data->timestamp = jiffies;
1342         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
1343                                 &data->o_arg.seq_args,
1344                                 &data->o_res.seq_res, 1, task))
1345                 return;
1346         rpc_call_start(task);
1347         return;
1348 out_no_action:
1349         task->tk_action = NULL;
1350
1351 }
1352
1353 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1354 {
1355         struct nfs4_opendata *data = calldata;
1356
1357         data->rpc_status = task->tk_status;
1358
1359         nfs4_sequence_done_free_slot(data->o_arg.server, &data->o_res.seq_res,
1360                                      task->tk_status);
1361
1362         if (RPC_ASSASSINATED(task))
1363                 return;
1364         if (task->tk_status == 0) {
1365                 switch (data->o_res.f_attr->mode & S_IFMT) {
1366                         case S_IFREG:
1367                                 break;
1368                         case S_IFLNK:
1369                                 data->rpc_status = -ELOOP;
1370                                 break;
1371                         case S_IFDIR:
1372                                 data->rpc_status = -EISDIR;
1373                                 break;
1374                         default:
1375                                 data->rpc_status = -ENOTDIR;
1376                 }
1377                 renew_lease(data->o_res.server, data->timestamp);
1378                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1379                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1380         }
1381         data->rpc_done = 1;
1382 }
1383
1384 static void nfs4_open_release(void *calldata)
1385 {
1386         struct nfs4_opendata *data = calldata;
1387         struct nfs4_state *state = NULL;
1388
1389         /* If this request hasn't been cancelled, do nothing */
1390         if (data->cancelled == 0)
1391                 goto out_free;
1392         /* In case of error, no cleanup! */
1393         if (data->rpc_status != 0 || !data->rpc_done)
1394                 goto out_free;
1395         /* In case we need an open_confirm, no cleanup! */
1396         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1397                 goto out_free;
1398         state = nfs4_opendata_to_nfs4_state(data);
1399         if (!IS_ERR(state))
1400                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1401 out_free:
1402         nfs4_opendata_put(data);
1403 }
1404
1405 static const struct rpc_call_ops nfs4_open_ops = {
1406         .rpc_call_prepare = nfs4_open_prepare,
1407         .rpc_call_done = nfs4_open_done,
1408         .rpc_release = nfs4_open_release,
1409 };
1410
1411 /*
1412  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1413  */
1414 static int _nfs4_proc_open(struct nfs4_opendata *data)
1415 {
1416         struct inode *dir = data->dir->d_inode;
1417         struct nfs_server *server = NFS_SERVER(dir);
1418         struct nfs_openargs *o_arg = &data->o_arg;
1419         struct nfs_openres *o_res = &data->o_res;
1420         struct rpc_task *task;
1421         struct rpc_message msg = {
1422                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1423                 .rpc_argp = o_arg,
1424                 .rpc_resp = o_res,
1425                 .rpc_cred = data->owner->so_cred,
1426         };
1427         struct rpc_task_setup task_setup_data = {
1428                 .rpc_client = server->client,
1429                 .rpc_message = &msg,
1430                 .callback_ops = &nfs4_open_ops,
1431                 .callback_data = data,
1432                 .workqueue = nfsiod_workqueue,
1433                 .flags = RPC_TASK_ASYNC,
1434         };
1435         int status;
1436
1437         kref_get(&data->kref);
1438         data->rpc_done = 0;
1439         data->rpc_status = 0;
1440         data->cancelled = 0;
1441         task = rpc_run_task(&task_setup_data);
1442         if (IS_ERR(task))
1443                 return PTR_ERR(task);
1444         status = nfs4_wait_for_completion_rpc_task(task);
1445         if (status != 0) {
1446                 data->cancelled = 1;
1447                 smp_wmb();
1448         } else
1449                 status = data->rpc_status;
1450         rpc_put_task(task);
1451         if (status != 0 || !data->rpc_done)
1452                 return status;
1453
1454         if (o_res->fh.size == 0)
1455                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1456
1457         if (o_arg->open_flags & O_CREAT) {
1458                 update_changeattr(dir, &o_res->cinfo);
1459                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1460         } else
1461                 nfs_refresh_inode(dir, o_res->dir_attr);
1462         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1463                 status = _nfs4_proc_open_confirm(data);
1464                 if (status != 0)
1465                         return status;
1466         }
1467         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1468                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1469         return 0;
1470 }
1471
1472 static int nfs4_recover_expired_lease(struct nfs_server *server)
1473 {
1474         struct nfs_client *clp = server->nfs_client;
1475         unsigned int loop;
1476         int ret;
1477
1478         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1479                 ret = nfs4_wait_clnt_recover(clp);
1480                 if (ret != 0)
1481                         break;
1482                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1483                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1484                         break;
1485                 nfs4_schedule_state_recovery(clp);
1486                 ret = -EIO;
1487         }
1488         return ret;
1489 }
1490
1491 /*
1492  * OPEN_EXPIRED:
1493  *      reclaim state on the server after a network partition.
1494  *      Assumes caller holds the appropriate lock
1495  */
1496 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1497 {
1498         struct nfs4_opendata *opendata;
1499         int ret;
1500
1501         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1502         if (IS_ERR(opendata))
1503                 return PTR_ERR(opendata);
1504         ret = nfs4_open_recover(opendata, state);
1505         if (ret == -ESTALE)
1506                 d_drop(ctx->path.dentry);
1507         nfs4_opendata_put(opendata);
1508         return ret;
1509 }
1510
1511 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1512 {
1513         struct nfs_server *server = NFS_SERVER(state->inode);
1514         struct nfs4_exception exception = { };
1515         int err;
1516
1517         do {
1518                 err = _nfs4_open_expired(ctx, state);
1519                 switch (err) {
1520                 default:
1521                         goto out;
1522                 case -NFS4ERR_GRACE:
1523                 case -NFS4ERR_DELAY:
1524                         nfs4_handle_exception(server, err, &exception);
1525                         err = 0;
1526                 }
1527         } while (exception.retry);
1528 out:
1529         return err;
1530 }
1531
1532 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1533 {
1534         struct nfs_open_context *ctx;
1535         int ret;
1536
1537         ctx = nfs4_state_find_open_context(state);
1538         if (IS_ERR(ctx))
1539                 return PTR_ERR(ctx);
1540         ret = nfs4_do_open_expired(ctx, state);
1541         put_nfs_open_context(ctx);
1542         return ret;
1543 }
1544
1545 /*
1546  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1547  * fields corresponding to attributes that were used to store the verifier.
1548  * Make sure we clobber those fields in the later setattr call
1549  */
1550 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1551 {
1552         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1553             !(sattr->ia_valid & ATTR_ATIME_SET))
1554                 sattr->ia_valid |= ATTR_ATIME;
1555
1556         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1557             !(sattr->ia_valid & ATTR_MTIME_SET))
1558                 sattr->ia_valid |= ATTR_MTIME;
1559 }
1560
1561 /*
1562  * Returns a referenced nfs4_state
1563  */
1564 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)
1565 {
1566         struct nfs4_state_owner  *sp;
1567         struct nfs4_state     *state = NULL;
1568         struct nfs_server       *server = NFS_SERVER(dir);
1569         struct nfs4_opendata *opendata;
1570         int status;
1571
1572         /* Protect against reboot recovery conflicts */
1573         status = -ENOMEM;
1574         if (!(sp = nfs4_get_state_owner(server, cred))) {
1575                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1576                 goto out_err;
1577         }
1578         status = nfs4_recover_expired_lease(server);
1579         if (status != 0)
1580                 goto err_put_state_owner;
1581         if (path->dentry->d_inode != NULL)
1582                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1583         status = -ENOMEM;
1584         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1585         if (opendata == NULL)
1586                 goto err_put_state_owner;
1587
1588         if (path->dentry->d_inode != NULL)
1589                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1590
1591         status = _nfs4_proc_open(opendata);
1592         if (status != 0)
1593                 goto err_opendata_put;
1594
1595         if (opendata->o_arg.open_flags & O_EXCL)
1596                 nfs4_exclusive_attrset(opendata, sattr);
1597
1598         state = nfs4_opendata_to_nfs4_state(opendata);
1599         status = PTR_ERR(state);
1600         if (IS_ERR(state))
1601                 goto err_opendata_put;
1602         nfs4_opendata_put(opendata);
1603         nfs4_put_state_owner(sp);
1604         *res = state;
1605         return 0;
1606 err_opendata_put:
1607         nfs4_opendata_put(opendata);
1608 err_put_state_owner:
1609         nfs4_put_state_owner(sp);
1610 out_err:
1611         *res = NULL;
1612         return status;
1613 }
1614
1615
1616 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)
1617 {
1618         struct nfs4_exception exception = { };
1619         struct nfs4_state *res;
1620         int status;
1621
1622         do {
1623                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1624                 if (status == 0)
1625                         break;
1626                 /* NOTE: BAD_SEQID means the server and client disagree about the
1627                  * book-keeping w.r.t. state-changing operations
1628                  * (OPEN/CLOSE/LOCK/LOCKU...)
1629                  * It is actually a sign of a bug on the client or on the server.
1630                  *
1631                  * If we receive a BAD_SEQID error in the particular case of
1632                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1633                  * have unhashed the old state_owner for us, and that we can
1634                  * therefore safely retry using a new one. We should still warn
1635                  * the user though...
1636                  */
1637                 if (status == -NFS4ERR_BAD_SEQID) {
1638                         printk(KERN_WARNING "NFS: v4 server %s "
1639                                         " returned a bad sequence-id error!\n",
1640                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1641                         exception.retry = 1;
1642                         continue;
1643                 }
1644                 /*
1645                  * BAD_STATEID on OPEN means that the server cancelled our
1646                  * state before it received the OPEN_CONFIRM.
1647                  * Recover by retrying the request as per the discussion
1648                  * on Page 181 of RFC3530.
1649                  */
1650                 if (status == -NFS4ERR_BAD_STATEID) {
1651                         exception.retry = 1;
1652                         continue;
1653                 }
1654                 if (status == -EAGAIN) {
1655                         /* We must have found a delegation */
1656                         exception.retry = 1;
1657                         continue;
1658                 }
1659                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1660                                         status, &exception));
1661         } while (exception.retry);
1662         return res;
1663 }
1664
1665 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1666                             struct nfs_fattr *fattr, struct iattr *sattr,
1667                             struct nfs4_state *state)
1668 {
1669         struct nfs_server *server = NFS_SERVER(inode);
1670         struct nfs_setattrargs  arg = {
1671                 .fh             = NFS_FH(inode),
1672                 .iap            = sattr,
1673                 .server         = server,
1674                 .bitmask = server->attr_bitmask,
1675         };
1676         struct nfs_setattrres  res = {
1677                 .fattr          = fattr,
1678                 .server         = server,
1679         };
1680         struct rpc_message msg = {
1681                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1682                 .rpc_argp       = &arg,
1683                 .rpc_resp       = &res,
1684                 .rpc_cred       = cred,
1685         };
1686         unsigned long timestamp = jiffies;
1687         int status;
1688
1689         nfs_fattr_init(fattr);
1690
1691         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1692                 /* Use that stateid */
1693         } else if (state != NULL) {
1694                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1695         } else
1696                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1697
1698         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1699         if (status == 0 && state != NULL)
1700                 renew_lease(server, timestamp);
1701         return status;
1702 }
1703
1704 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1705                            struct nfs_fattr *fattr, struct iattr *sattr,
1706                            struct nfs4_state *state)
1707 {
1708         struct nfs_server *server = NFS_SERVER(inode);
1709         struct nfs4_exception exception = { };
1710         int err;
1711         do {
1712                 err = nfs4_handle_exception(server,
1713                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1714                                 &exception);
1715         } while (exception.retry);
1716         return err;
1717 }
1718
1719 struct nfs4_closedata {
1720         struct path path;
1721         struct inode *inode;
1722         struct nfs4_state *state;
1723         struct nfs_closeargs arg;
1724         struct nfs_closeres res;
1725         struct nfs_fattr fattr;
1726         unsigned long timestamp;
1727 };
1728
1729 static void nfs4_free_closedata(void *data)
1730 {
1731         struct nfs4_closedata *calldata = data;
1732         struct nfs4_state_owner *sp = calldata->state->owner;
1733
1734         nfs4_put_open_state(calldata->state);
1735         nfs_free_seqid(calldata->arg.seqid);
1736         nfs4_put_state_owner(sp);
1737         path_put(&calldata->path);
1738         kfree(calldata);
1739 }
1740
1741 static void nfs4_close_done(struct rpc_task *task, void *data)
1742 {
1743         struct nfs4_closedata *calldata = data;
1744         struct nfs4_state *state = calldata->state;
1745         struct nfs_server *server = NFS_SERVER(calldata->inode);
1746
1747         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1748         if (RPC_ASSASSINATED(task))
1749                 return;
1750         /* hmm. we are done with the inode, and in the process of freeing
1751          * the state_owner. we keep this around to process errors
1752          */
1753         switch (task->tk_status) {
1754                 case 0:
1755                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1756                         renew_lease(server, calldata->timestamp);
1757                         break;
1758                 case -NFS4ERR_STALE_STATEID:
1759                 case -NFS4ERR_OLD_STATEID:
1760                 case -NFS4ERR_BAD_STATEID:
1761                 case -NFS4ERR_EXPIRED:
1762                         if (calldata->arg.fmode == 0)
1763                                 break;
1764                 default:
1765                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1766                                 nfs4_restart_rpc(task, server->nfs_client,
1767                                                  &calldata->res.seq_res);
1768                                 return;
1769                         }
1770         }
1771         nfs4_sequence_free_slot(server->nfs_client, &calldata->res.seq_res);
1772         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1773 }
1774
1775 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1776 {
1777         struct nfs4_closedata *calldata = data;
1778         struct nfs4_state *state = calldata->state;
1779         int clear_rd, clear_wr, clear_rdwr;
1780
1781         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1782                 return;
1783
1784         clear_rd = clear_wr = clear_rdwr = 0;
1785         spin_lock(&state->owner->so_lock);
1786         /* Calculate the change in open mode */
1787         if (state->n_rdwr == 0) {
1788                 if (state->n_rdonly == 0) {
1789                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1790                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1791                 }
1792                 if (state->n_wronly == 0) {
1793                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1794                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1795                 }
1796         }
1797         spin_unlock(&state->owner->so_lock);
1798         if (!clear_rd && !clear_wr && !clear_rdwr) {
1799                 /* Note: exit _without_ calling nfs4_close_done */
1800                 task->tk_action = NULL;
1801                 return;
1802         }
1803         nfs_fattr_init(calldata->res.fattr);
1804         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1805                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1806                 calldata->arg.fmode = FMODE_READ;
1807         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1808                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1809                 calldata->arg.fmode = FMODE_WRITE;
1810         }
1811         calldata->timestamp = jiffies;
1812         if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1813                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1814                                 1, task))
1815                 return;
1816         rpc_call_start(task);
1817 }
1818
1819 static const struct rpc_call_ops nfs4_close_ops = {
1820         .rpc_call_prepare = nfs4_close_prepare,
1821         .rpc_call_done = nfs4_close_done,
1822         .rpc_release = nfs4_free_closedata,
1823 };
1824
1825 /*
1826  * It is possible for data to be read/written from a mem-mapped file
1827  * after the sys_close call (which hits the vfs layer as a flush).
1828  * This means that we can't safely call nfsv4 close on a file until
1829  * the inode is cleared. This in turn means that we are not good
1830  * NFSv4 citizens - we do not indicate to the server to update the file's
1831  * share state even when we are done with one of the three share
1832  * stateid's in the inode.
1833  *
1834  * NOTE: Caller must be holding the sp->so_owner semaphore!
1835  */
1836 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1837 {
1838         struct nfs_server *server = NFS_SERVER(state->inode);
1839         struct nfs4_closedata *calldata;
1840         struct nfs4_state_owner *sp = state->owner;
1841         struct rpc_task *task;
1842         struct rpc_message msg = {
1843                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1844                 .rpc_cred = state->owner->so_cred,
1845         };
1846         struct rpc_task_setup task_setup_data = {
1847                 .rpc_client = server->client,
1848                 .rpc_message = &msg,
1849                 .callback_ops = &nfs4_close_ops,
1850                 .workqueue = nfsiod_workqueue,
1851                 .flags = RPC_TASK_ASYNC,
1852         };
1853         int status = -ENOMEM;
1854
1855         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1856         if (calldata == NULL)
1857                 goto out;
1858         calldata->inode = state->inode;
1859         calldata->state = state;
1860         calldata->arg.fh = NFS_FH(state->inode);
1861         calldata->arg.stateid = &state->open_stateid;
1862         if (nfs4_has_session(server->nfs_client))
1863                 memset(calldata->arg.stateid->data, 0, 4);    /* clear seqid */
1864         /* Serialization for the sequence id */
1865         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1866         if (calldata->arg.seqid == NULL)
1867                 goto out_free_calldata;
1868         calldata->arg.fmode = 0;
1869         calldata->arg.bitmask = server->cache_consistency_bitmask;
1870         calldata->res.fattr = &calldata->fattr;
1871         calldata->res.seqid = calldata->arg.seqid;
1872         calldata->res.server = server;
1873         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1874         calldata->path.mnt = mntget(path->mnt);
1875         calldata->path.dentry = dget(path->dentry);
1876
1877         msg.rpc_argp = &calldata->arg,
1878         msg.rpc_resp = &calldata->res,
1879         task_setup_data.callback_data = calldata;
1880         task = rpc_run_task(&task_setup_data);
1881         if (IS_ERR(task))
1882                 return PTR_ERR(task);
1883         status = 0;
1884         if (wait)
1885                 status = rpc_wait_for_completion_task(task);
1886         rpc_put_task(task);
1887         return status;
1888 out_free_calldata:
1889         kfree(calldata);
1890 out:
1891         nfs4_put_open_state(state);
1892         nfs4_put_state_owner(sp);
1893         return status;
1894 }
1895
1896 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1897 {
1898         struct file *filp;
1899         int ret;
1900
1901         /* If the open_intent is for execute, we have an extra check to make */
1902         if (fmode & FMODE_EXEC) {
1903                 ret = nfs_may_open(state->inode,
1904                                 state->owner->so_cred,
1905                                 nd->intent.open.flags);
1906                 if (ret < 0)
1907                         goto out_close;
1908         }
1909         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1910         if (!IS_ERR(filp)) {
1911                 struct nfs_open_context *ctx;
1912                 ctx = nfs_file_open_context(filp);
1913                 ctx->state = state;
1914                 return 0;
1915         }
1916         ret = PTR_ERR(filp);
1917 out_close:
1918         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1919         return ret;
1920 }
1921
1922 struct dentry *
1923 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1924 {
1925         struct path path = {
1926                 .mnt = nd->path.mnt,
1927                 .dentry = dentry,
1928         };
1929         struct dentry *parent;
1930         struct iattr attr;
1931         struct rpc_cred *cred;
1932         struct nfs4_state *state;
1933         struct dentry *res;
1934         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1935
1936         if (nd->flags & LOOKUP_CREATE) {
1937                 attr.ia_mode = nd->intent.open.create_mode;
1938                 attr.ia_valid = ATTR_MODE;
1939                 if (!IS_POSIXACL(dir))
1940                         attr.ia_mode &= ~current_umask();
1941         } else {
1942                 attr.ia_valid = 0;
1943                 BUG_ON(nd->intent.open.flags & O_CREAT);
1944         }
1945
1946         cred = rpc_lookup_cred();
1947         if (IS_ERR(cred))
1948                 return (struct dentry *)cred;
1949         parent = dentry->d_parent;
1950         /* Protect against concurrent sillydeletes */
1951         nfs_block_sillyrename(parent);
1952         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1953         put_rpccred(cred);
1954         if (IS_ERR(state)) {
1955                 if (PTR_ERR(state) == -ENOENT) {
1956                         d_add(dentry, NULL);
1957                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1958                 }
1959                 nfs_unblock_sillyrename(parent);
1960                 return (struct dentry *)state;
1961         }
1962         res = d_add_unique(dentry, igrab(state->inode));
1963         if (res != NULL)
1964                 path.dentry = res;
1965         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1966         nfs_unblock_sillyrename(parent);
1967         nfs4_intent_set_file(nd, &path, state, fmode);
1968         return res;
1969 }
1970
1971 int
1972 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1973 {
1974         struct path path = {
1975                 .mnt = nd->path.mnt,
1976                 .dentry = dentry,
1977         };
1978         struct rpc_cred *cred;
1979         struct nfs4_state *state;
1980         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1981
1982         cred = rpc_lookup_cred();
1983         if (IS_ERR(cred))
1984                 return PTR_ERR(cred);
1985         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1986         put_rpccred(cred);
1987         if (IS_ERR(state)) {
1988                 switch (PTR_ERR(state)) {
1989                         case -EPERM:
1990                         case -EACCES:
1991                         case -EDQUOT:
1992                         case -ENOSPC:
1993                         case -EROFS:
1994                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1995                                 return 1;
1996                         default:
1997                                 goto out_drop;
1998                 }
1999         }
2000         if (state->inode == dentry->d_inode) {
2001                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2002                 nfs4_intent_set_file(nd, &path, state, fmode);
2003                 return 1;
2004         }
2005         nfs4_close_sync(&path, state, fmode);
2006 out_drop:
2007         d_drop(dentry);
2008         return 0;
2009 }
2010
2011 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2012 {
2013         if (ctx->state == NULL)
2014                 return;
2015         if (is_sync)
2016                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
2017         else
2018                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
2019 }
2020
2021 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2022 {
2023         struct nfs4_server_caps_arg args = {
2024                 .fhandle = fhandle,
2025         };
2026         struct nfs4_server_caps_res res = {};
2027         struct rpc_message msg = {
2028                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2029                 .rpc_argp = &args,
2030                 .rpc_resp = &res,
2031         };
2032         int status;
2033
2034         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2035         if (status == 0) {
2036                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2037                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2038                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2039                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2040                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2041                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2042                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2043                         server->caps |= NFS_CAP_ACLS;
2044                 if (res.has_links != 0)
2045                         server->caps |= NFS_CAP_HARDLINKS;
2046                 if (res.has_symlinks != 0)
2047                         server->caps |= NFS_CAP_SYMLINKS;
2048                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2049                         server->caps |= NFS_CAP_FILEID;
2050                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2051                         server->caps |= NFS_CAP_MODE;
2052                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2053                         server->caps |= NFS_CAP_NLINK;
2054                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2055                         server->caps |= NFS_CAP_OWNER;
2056                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2057                         server->caps |= NFS_CAP_OWNER_GROUP;
2058                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2059                         server->caps |= NFS_CAP_ATIME;
2060                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2061                         server->caps |= NFS_CAP_CTIME;
2062                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2063                         server->caps |= NFS_CAP_MTIME;
2064
2065                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2066                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2067                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2068                 server->acl_bitmask = res.acl_bitmask;
2069         }
2070
2071         return status;
2072 }
2073
2074 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2075 {
2076         struct nfs4_exception exception = { };
2077         int err;
2078         do {
2079                 err = nfs4_handle_exception(server,
2080                                 _nfs4_server_capabilities(server, fhandle),
2081                                 &exception);
2082         } while (exception.retry);
2083         return err;
2084 }
2085
2086 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2087                 struct nfs_fsinfo *info)
2088 {
2089         struct nfs4_lookup_root_arg args = {
2090                 .bitmask = nfs4_fattr_bitmap,
2091         };
2092         struct nfs4_lookup_res res = {
2093                 .server = server,
2094                 .fattr = info->fattr,
2095                 .fh = fhandle,
2096         };
2097         struct rpc_message msg = {
2098                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2099                 .rpc_argp = &args,
2100                 .rpc_resp = &res,
2101         };
2102
2103         nfs_fattr_init(info->fattr);
2104         return nfs4_call_sync(server, &msg, &args, &res, 0);
2105 }
2106
2107 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2108                 struct nfs_fsinfo *info)
2109 {
2110         struct nfs4_exception exception = { };
2111         int err;
2112         do {
2113                 err = nfs4_handle_exception(server,
2114                                 _nfs4_lookup_root(server, fhandle, info),
2115                                 &exception);
2116         } while (exception.retry);
2117         return err;
2118 }
2119
2120 /*
2121  * get the file handle for the "/" directory on the server
2122  */
2123 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2124                               struct nfs_fsinfo *info)
2125 {
2126         int status;
2127
2128         status = nfs4_lookup_root(server, fhandle, info);
2129         if (status == 0)
2130                 status = nfs4_server_capabilities(server, fhandle);
2131         if (status == 0)
2132                 status = nfs4_do_fsinfo(server, fhandle, info);
2133         return nfs4_map_errors(status);
2134 }
2135
2136 /*
2137  * Get locations and (maybe) other attributes of a referral.
2138  * Note that we'll actually follow the referral later when
2139  * we detect fsid mismatch in inode revalidation
2140  */
2141 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2142 {
2143         int status = -ENOMEM;
2144         struct page *page = NULL;
2145         struct nfs4_fs_locations *locations = NULL;
2146
2147         page = alloc_page(GFP_KERNEL);
2148         if (page == NULL)
2149                 goto out;
2150         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2151         if (locations == NULL)
2152                 goto out;
2153
2154         status = nfs4_proc_fs_locations(dir, name, locations, page);
2155         if (status != 0)
2156                 goto out;
2157         /* Make sure server returned a different fsid for the referral */
2158         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2159                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2160                 status = -EIO;
2161                 goto out;
2162         }
2163
2164         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2165         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2166         if (!fattr->mode)
2167                 fattr->mode = S_IFDIR;
2168         memset(fhandle, 0, sizeof(struct nfs_fh));
2169 out:
2170         if (page)
2171                 __free_page(page);
2172         if (locations)
2173                 kfree(locations);
2174         return status;
2175 }
2176
2177 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2178 {
2179         struct nfs4_getattr_arg args = {
2180                 .fh = fhandle,
2181                 .bitmask = server->attr_bitmask,
2182         };
2183         struct nfs4_getattr_res res = {
2184                 .fattr = fattr,
2185                 .server = server,
2186         };
2187         struct rpc_message msg = {
2188                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2189                 .rpc_argp = &args,
2190                 .rpc_resp = &res,
2191         };
2192
2193         nfs_fattr_init(fattr);
2194         return nfs4_call_sync(server, &msg, &args, &res, 0);
2195 }
2196
2197 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2198 {
2199         struct nfs4_exception exception = { };
2200         int err;
2201         do {
2202                 err = nfs4_handle_exception(server,
2203                                 _nfs4_proc_getattr(server, fhandle, fattr),
2204                                 &exception);
2205         } while (exception.retry);
2206         return err;
2207 }
2208
2209 /*
2210  * The file is not closed if it is opened due to the a request to change
2211  * the size of the file. The open call will not be needed once the
2212  * VFS layer lookup-intents are implemented.
2213  *
2214  * Close is called when the inode is destroyed.
2215  * If we haven't opened the file for O_WRONLY, we
2216  * need to in the size_change case to obtain a stateid.
2217  *
2218  * Got race?
2219  * Because OPEN is always done by name in nfsv4, it is
2220  * possible that we opened a different file by the same
2221  * name.  We can recognize this race condition, but we
2222  * can't do anything about it besides returning an error.
2223  *
2224  * This will be fixed with VFS changes (lookup-intent).
2225  */
2226 static int
2227 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2228                   struct iattr *sattr)
2229 {
2230         struct inode *inode = dentry->d_inode;
2231         struct rpc_cred *cred = NULL;
2232         struct nfs4_state *state = NULL;
2233         int status;
2234
2235         nfs_fattr_init(fattr);
2236
2237         /* Search for an existing open(O_WRITE) file */
2238         if (sattr->ia_valid & ATTR_FILE) {
2239                 struct nfs_open_context *ctx;
2240
2241                 ctx = nfs_file_open_context(sattr->ia_file);
2242                 if (ctx) {
2243                         cred = ctx->cred;
2244                         state = ctx->state;
2245                 }
2246         }
2247
2248         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2249         if (status == 0)
2250                 nfs_setattr_update_inode(inode, sattr);
2251         return status;
2252 }
2253
2254 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2255                 const struct qstr *name, struct nfs_fh *fhandle,
2256                 struct nfs_fattr *fattr)
2257 {
2258         int                    status;
2259         struct nfs4_lookup_arg args = {
2260                 .bitmask = server->attr_bitmask,
2261                 .dir_fh = dirfh,
2262                 .name = name,
2263         };
2264         struct nfs4_lookup_res res = {
2265                 .server = server,
2266                 .fattr = fattr,
2267                 .fh = fhandle,
2268         };
2269         struct rpc_message msg = {
2270                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2271                 .rpc_argp = &args,
2272                 .rpc_resp = &res,
2273         };
2274
2275         nfs_fattr_init(fattr);
2276
2277         dprintk("NFS call  lookupfh %s\n", name->name);
2278         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2279         dprintk("NFS reply lookupfh: %d\n", status);
2280         return status;
2281 }
2282
2283 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2284                               struct qstr *name, struct nfs_fh *fhandle,
2285                               struct nfs_fattr *fattr)
2286 {
2287         struct nfs4_exception exception = { };
2288         int err;
2289         do {
2290                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2291                 /* FIXME: !!!! */
2292                 if (err == -NFS4ERR_MOVED) {
2293                         err = -EREMOTE;
2294                         break;
2295                 }
2296                 err = nfs4_handle_exception(server, err, &exception);
2297         } while (exception.retry);
2298         return err;
2299 }
2300
2301 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2302                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2303 {
2304         int status;
2305
2306         dprintk("NFS call  lookup %s\n", name->name);
2307         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2308         if (status == -NFS4ERR_MOVED)
2309                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2310         dprintk("NFS reply lookup: %d\n", status);
2311         return status;
2312 }
2313
2314 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2315 {
2316         struct nfs4_exception exception = { };
2317         int err;
2318         do {
2319                 err = nfs4_handle_exception(NFS_SERVER(dir),
2320                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2321                                 &exception);
2322         } while (exception.retry);
2323         return err;
2324 }
2325
2326 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2327 {
2328         struct nfs_server *server = NFS_SERVER(inode);
2329         struct nfs_fattr fattr;
2330         struct nfs4_accessargs args = {
2331                 .fh = NFS_FH(inode),
2332                 .bitmask = server->attr_bitmask,
2333         };
2334         struct nfs4_accessres res = {
2335                 .server = server,
2336                 .fattr = &fattr,
2337         };
2338         struct rpc_message msg = {
2339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2340                 .rpc_argp = &args,
2341                 .rpc_resp = &res,
2342                 .rpc_cred = entry->cred,
2343         };
2344         int mode = entry->mask;
2345         int status;
2346
2347         /*
2348          * Determine which access bits we want to ask for...
2349          */
2350         if (mode & MAY_READ)
2351                 args.access |= NFS4_ACCESS_READ;
2352         if (S_ISDIR(inode->i_mode)) {
2353                 if (mode & MAY_WRITE)
2354                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2355                 if (mode & MAY_EXEC)
2356                         args.access |= NFS4_ACCESS_LOOKUP;
2357         } else {
2358                 if (mode & MAY_WRITE)
2359                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2360                 if (mode & MAY_EXEC)
2361                         args.access |= NFS4_ACCESS_EXECUTE;
2362         }
2363         nfs_fattr_init(&fattr);
2364         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2365         if (!status) {
2366                 entry->mask = 0;
2367                 if (res.access & NFS4_ACCESS_READ)
2368                         entry->mask |= MAY_READ;
2369                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2370                         entry->mask |= MAY_WRITE;
2371                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2372                         entry->mask |= MAY_EXEC;
2373                 nfs_refresh_inode(inode, &fattr);
2374         }
2375         return status;
2376 }
2377
2378 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2379 {
2380         struct nfs4_exception exception = { };
2381         int err;
2382         do {
2383                 err = nfs4_handle_exception(NFS_SERVER(inode),
2384                                 _nfs4_proc_access(inode, entry),
2385                                 &exception);
2386         } while (exception.retry);
2387         return err;
2388 }
2389
2390 /*
2391  * TODO: For the time being, we don't try to get any attributes
2392  * along with any of the zero-copy operations READ, READDIR,
2393  * READLINK, WRITE.
2394  *
2395  * In the case of the first three, we want to put the GETATTR
2396  * after the read-type operation -- this is because it is hard
2397  * to predict the length of a GETATTR response in v4, and thus
2398  * align the READ data correctly.  This means that the GETATTR
2399  * may end up partially falling into the page cache, and we should
2400  * shift it into the 'tail' of the xdr_buf before processing.
2401  * To do this efficiently, we need to know the total length
2402  * of data received, which doesn't seem to be available outside
2403  * of the RPC layer.
2404  *
2405  * In the case of WRITE, we also want to put the GETATTR after
2406  * the operation -- in this case because we want to make sure
2407  * we get the post-operation mtime and size.  This means that
2408  * we can't use xdr_encode_pages() as written: we need a variant
2409  * of it which would leave room in the 'tail' iovec.
2410  *
2411  * Both of these changes to the XDR layer would in fact be quite
2412  * minor, but I decided to leave them for a subsequent patch.
2413  */
2414 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2415                 unsigned int pgbase, unsigned int pglen)
2416 {
2417         struct nfs4_readlink args = {
2418                 .fh       = NFS_FH(inode),
2419                 .pgbase   = pgbase,
2420                 .pglen    = pglen,
2421                 .pages    = &page,
2422         };
2423         struct nfs4_readlink_res res;
2424         struct rpc_message msg = {
2425                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2426                 .rpc_argp = &args,
2427                 .rpc_resp = &res,
2428         };
2429
2430         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2431 }
2432
2433 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2434                 unsigned int pgbase, unsigned int pglen)
2435 {
2436         struct nfs4_exception exception = { };
2437         int err;
2438         do {
2439                 err = nfs4_handle_exception(NFS_SERVER(inode),
2440                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2441                                 &exception);
2442         } while (exception.retry);
2443         return err;
2444 }
2445
2446 /*
2447  * Got race?
2448  * We will need to arrange for the VFS layer to provide an atomic open.
2449  * Until then, this create/open method is prone to inefficiency and race
2450  * conditions due to the lookup, create, and open VFS calls from sys_open()
2451  * placed on the wire.
2452  *
2453  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2454  * The file will be opened again in the subsequent VFS open call
2455  * (nfs4_proc_file_open).
2456  *
2457  * The open for read will just hang around to be used by any process that
2458  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2459  */
2460
2461 static int
2462 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2463                  int flags, struct nameidata *nd)
2464 {
2465         struct path path = {
2466                 .mnt = nd->path.mnt,
2467                 .dentry = dentry,
2468         };
2469         struct nfs4_state *state;
2470         struct rpc_cred *cred;
2471         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2472         int status = 0;
2473
2474         cred = rpc_lookup_cred();
2475         if (IS_ERR(cred)) {
2476                 status = PTR_ERR(cred);
2477                 goto out;
2478         }
2479         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2480         d_drop(dentry);
2481         if (IS_ERR(state)) {
2482                 status = PTR_ERR(state);
2483                 goto out_putcred;
2484         }
2485         d_add(dentry, igrab(state->inode));
2486         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2487         if (flags & O_EXCL) {
2488                 struct nfs_fattr fattr;
2489                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2490                 if (status == 0)
2491                         nfs_setattr_update_inode(state->inode, sattr);
2492                 nfs_post_op_update_inode(state->inode, &fattr);
2493         }
2494         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2495                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2496         else
2497                 nfs4_close_sync(&path, state, fmode);
2498 out_putcred:
2499         put_rpccred(cred);
2500 out:
2501         return status;
2502 }
2503
2504 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2505 {
2506         struct nfs_server *server = NFS_SERVER(dir);
2507         struct nfs_removeargs args = {
2508                 .fh = NFS_FH(dir),
2509                 .name.len = name->len,
2510                 .name.name = name->name,
2511                 .bitmask = server->attr_bitmask,
2512         };
2513         struct nfs_removeres res = {
2514                 .server = server,
2515         };
2516         struct rpc_message msg = {
2517                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2518                 .rpc_argp = &args,
2519                 .rpc_resp = &res,
2520         };
2521         int                     status;
2522
2523         nfs_fattr_init(&res.dir_attr);
2524         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2525         if (status == 0) {
2526                 update_changeattr(dir, &res.cinfo);
2527                 nfs_post_op_update_inode(dir, &res.dir_attr);
2528         }
2529         return status;
2530 }
2531
2532 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2533 {
2534         struct nfs4_exception exception = { };
2535         int err;
2536         do {
2537                 err = nfs4_handle_exception(NFS_SERVER(dir),
2538                                 _nfs4_proc_remove(dir, name),
2539                                 &exception);
2540         } while (exception.retry);
2541         return err;
2542 }
2543
2544 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2545 {
2546         struct nfs_server *server = NFS_SERVER(dir);
2547         struct nfs_removeargs *args = msg->rpc_argp;
2548         struct nfs_removeres *res = msg->rpc_resp;
2549
2550         args->bitmask = server->cache_consistency_bitmask;
2551         res->server = server;
2552         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2553 }
2554
2555 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2556 {
2557         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2558
2559         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2560         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2561                 return 0;
2562         nfs4_sequence_free_slot(res->server->nfs_client, &res->seq_res);
2563         update_changeattr(dir, &res->cinfo);
2564         nfs_post_op_update_inode(dir, &res->dir_attr);
2565         return 1;
2566 }
2567
2568 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2569                 struct inode *new_dir, struct qstr *new_name)
2570 {
2571         struct nfs_server *server = NFS_SERVER(old_dir);
2572         struct nfs4_rename_arg arg = {
2573                 .old_dir = NFS_FH(old_dir),
2574                 .new_dir = NFS_FH(new_dir),
2575                 .old_name = old_name,
2576                 .new_name = new_name,
2577                 .bitmask = server->attr_bitmask,
2578         };
2579         struct nfs_fattr old_fattr, new_fattr;
2580         struct nfs4_rename_res res = {
2581                 .server = server,
2582                 .old_fattr = &old_fattr,
2583                 .new_fattr = &new_fattr,
2584         };
2585         struct rpc_message msg = {
2586                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2587                 .rpc_argp = &arg,
2588                 .rpc_resp = &res,
2589         };
2590         int                     status;
2591
2592         nfs_fattr_init(res.old_fattr);
2593         nfs_fattr_init(res.new_fattr);
2594         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2595
2596         if (!status) {
2597                 update_changeattr(old_dir, &res.old_cinfo);
2598                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2599                 update_changeattr(new_dir, &res.new_cinfo);
2600                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2601         }
2602         return status;
2603 }
2604
2605 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2606                 struct inode *new_dir, struct qstr *new_name)
2607 {
2608         struct nfs4_exception exception = { };
2609         int err;
2610         do {
2611                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2612                                 _nfs4_proc_rename(old_dir, old_name,
2613                                         new_dir, new_name),
2614                                 &exception);
2615         } while (exception.retry);
2616         return err;
2617 }
2618
2619 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2620 {
2621         struct nfs_server *server = NFS_SERVER(inode);
2622         struct nfs4_link_arg arg = {
2623                 .fh     = NFS_FH(inode),
2624                 .dir_fh = NFS_FH(dir),
2625                 .name   = name,
2626                 .bitmask = server->attr_bitmask,
2627         };
2628         struct nfs_fattr fattr, dir_attr;
2629         struct nfs4_link_res res = {
2630                 .server = server,
2631                 .fattr = &fattr,
2632                 .dir_attr = &dir_attr,
2633         };
2634         struct rpc_message msg = {
2635                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2636                 .rpc_argp = &arg,
2637                 .rpc_resp = &res,
2638         };
2639         int                     status;
2640
2641         nfs_fattr_init(res.fattr);
2642         nfs_fattr_init(res.dir_attr);
2643         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2644         if (!status) {
2645                 update_changeattr(dir, &res.cinfo);
2646                 nfs_post_op_update_inode(dir, res.dir_attr);
2647                 nfs_post_op_update_inode(inode, res.fattr);
2648         }
2649
2650         return status;
2651 }
2652
2653 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2654 {
2655         struct nfs4_exception exception = { };
2656         int err;
2657         do {
2658                 err = nfs4_handle_exception(NFS_SERVER(inode),
2659                                 _nfs4_proc_link(inode, dir, name),
2660                                 &exception);
2661         } while (exception.retry);
2662         return err;
2663 }
2664
2665 struct nfs4_createdata {
2666         struct rpc_message msg;
2667         struct nfs4_create_arg arg;
2668         struct nfs4_create_res res;
2669         struct nfs_fh fh;
2670         struct nfs_fattr fattr;
2671         struct nfs_fattr dir_fattr;
2672 };
2673
2674 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2675                 struct qstr *name, struct iattr *sattr, u32 ftype)
2676 {
2677         struct nfs4_createdata *data;
2678
2679         data = kzalloc(sizeof(*data), GFP_KERNEL);
2680         if (data != NULL) {
2681                 struct nfs_server *server = NFS_SERVER(dir);
2682
2683                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2684                 data->msg.rpc_argp = &data->arg;
2685                 data->msg.rpc_resp = &data->res;
2686                 data->arg.dir_fh = NFS_FH(dir);
2687                 data->arg.server = server;
2688                 data->arg.name = name;
2689                 data->arg.attrs = sattr;
2690                 data->arg.ftype = ftype;
2691                 data->arg.bitmask = server->attr_bitmask;
2692                 data->res.server = server;
2693                 data->res.fh = &data->fh;
2694                 data->res.fattr = &data->fattr;
2695                 data->res.dir_fattr = &data->dir_fattr;
2696                 nfs_fattr_init(data->res.fattr);
2697                 nfs_fattr_init(data->res.dir_fattr);
2698         }
2699         return data;
2700 }
2701
2702 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2703 {
2704         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2705                                     &data->arg, &data->res, 1);
2706         if (status == 0) {
2707                 update_changeattr(dir, &data->res.dir_cinfo);
2708                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2709                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2710         }
2711         return status;
2712 }
2713
2714 static void nfs4_free_createdata(struct nfs4_createdata *data)
2715 {
2716         kfree(data);
2717 }
2718
2719 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2720                 struct page *page, unsigned int len, struct iattr *sattr)
2721 {
2722         struct nfs4_createdata *data;
2723         int status = -ENAMETOOLONG;
2724
2725         if (len > NFS4_MAXPATHLEN)
2726                 goto out;
2727
2728         status = -ENOMEM;
2729         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2730         if (data == NULL)
2731                 goto out;
2732
2733         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2734         data->arg.u.symlink.pages = &page;
2735         data->arg.u.symlink.len = len;
2736
2737         status = nfs4_do_create(dir, dentry, data);
2738
2739         nfs4_free_createdata(data);
2740 out:
2741         return status;
2742 }
2743
2744 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2745                 struct page *page, unsigned int len, struct iattr *sattr)
2746 {
2747         struct nfs4_exception exception = { };
2748         int err;
2749         do {
2750                 err = nfs4_handle_exception(NFS_SERVER(dir),
2751                                 _nfs4_proc_symlink(dir, dentry, page,
2752                                                         len, sattr),
2753                                 &exception);
2754         } while (exception.retry);
2755         return err;
2756 }
2757
2758 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2759                 struct iattr *sattr)
2760 {
2761         struct nfs4_createdata *data;
2762         int status = -ENOMEM;
2763
2764         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2765         if (data == NULL)
2766                 goto out;
2767
2768         status = nfs4_do_create(dir, dentry, data);
2769
2770         nfs4_free_createdata(data);
2771 out:
2772         return status;
2773 }
2774
2775 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2776                 struct iattr *sattr)
2777 {
2778         struct nfs4_exception exception = { };
2779         int err;
2780         do {
2781                 err = nfs4_handle_exception(NFS_SERVER(dir),
2782                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2783                                 &exception);
2784         } while (exception.retry);
2785         return err;
2786 }
2787
2788 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2789                   u64 cookie, struct page *page, unsigned int count, int plus)
2790 {
2791         struct inode            *dir = dentry->d_inode;
2792         struct nfs4_readdir_arg args = {
2793                 .fh = NFS_FH(dir),
2794                 .pages = &page,
2795                 .pgbase = 0,
2796                 .count = count,
2797                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2798         };
2799         struct nfs4_readdir_res res;
2800         struct rpc_message msg = {
2801                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2802                 .rpc_argp = &args,
2803                 .rpc_resp = &res,
2804                 .rpc_cred = cred,
2805         };
2806         int                     status;
2807
2808         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2809                         dentry->d_parent->d_name.name,
2810                         dentry->d_name.name,
2811                         (unsigned long long)cookie);
2812         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2813         res.pgbase = args.pgbase;
2814         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2815         if (status == 0)
2816                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2817
2818         nfs_invalidate_atime(dir);
2819
2820         dprintk("%s: returns %d\n", __func__, status);
2821         return status;
2822 }
2823
2824 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2825                   u64 cookie, struct page *page, unsigned int count, int plus)
2826 {
2827         struct nfs4_exception exception = { };
2828         int err;
2829         do {
2830                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2831                                 _nfs4_proc_readdir(dentry, cred, cookie,
2832                                         page, count, plus),
2833                                 &exception);
2834         } while (exception.retry);
2835         return err;
2836 }
2837
2838 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2839                 struct iattr *sattr, dev_t rdev)
2840 {
2841         struct nfs4_createdata *data;
2842         int mode = sattr->ia_mode;
2843         int status = -ENOMEM;
2844
2845         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2846         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2847
2848         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2849         if (data == NULL)
2850                 goto out;
2851
2852         if (S_ISFIFO(mode))
2853                 data->arg.ftype = NF4FIFO;
2854         else if (S_ISBLK(mode)) {
2855                 data->arg.ftype = NF4BLK;
2856                 data->arg.u.device.specdata1 = MAJOR(rdev);
2857                 data->arg.u.device.specdata2 = MINOR(rdev);
2858         }
2859         else if (S_ISCHR(mode)) {
2860                 data->arg.ftype = NF4CHR;
2861                 data->arg.u.device.specdata1 = MAJOR(rdev);
2862                 data->arg.u.device.specdata2 = MINOR(rdev);
2863         }
2864
2865         status = nfs4_do_create(dir, dentry, data);
2866
2867         nfs4_free_createdata(data);
2868 out:
2869         return status;
2870 }
2871
2872 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2873                 struct iattr *sattr, dev_t rdev)
2874 {
2875         struct nfs4_exception exception = { };
2876         int err;
2877         do {
2878                 err = nfs4_handle_exception(NFS_SERVER(dir),
2879                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2880                                 &exception);
2881         } while (exception.retry);
2882         return err;
2883 }
2884
2885 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2886                  struct nfs_fsstat *fsstat)
2887 {
2888         struct nfs4_statfs_arg args = {
2889                 .fh = fhandle,
2890                 .bitmask = server->attr_bitmask,
2891         };
2892         struct nfs4_statfs_res res = {
2893                 .fsstat = fsstat,
2894         };
2895         struct rpc_message msg = {
2896                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2897                 .rpc_argp = &args,
2898                 .rpc_resp = &res,
2899         };
2900
2901         nfs_fattr_init(fsstat->fattr);
2902         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2903 }
2904
2905 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2906 {
2907         struct nfs4_exception exception = { };
2908         int err;
2909         do {
2910                 err = nfs4_handle_exception(server,
2911                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2912                                 &exception);
2913         } while (exception.retry);
2914         return err;
2915 }
2916
2917 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2918                 struct nfs_fsinfo *fsinfo)
2919 {
2920         struct nfs4_fsinfo_arg args = {
2921                 .fh = fhandle,
2922                 .bitmask = server->attr_bitmask,
2923         };
2924         struct nfs4_fsinfo_res res = {
2925                 .fsinfo = fsinfo,
2926         };
2927         struct rpc_message msg = {
2928                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2929                 .rpc_argp = &args,
2930                 .rpc_resp = &res,
2931         };
2932
2933         return nfs4_call_sync(server, &msg, &args, &res, 0);
2934 }
2935
2936 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2937 {
2938         struct nfs4_exception exception = { };
2939         int err;
2940
2941         do {
2942                 err = nfs4_handle_exception(server,
2943                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2944                                 &exception);
2945         } while (exception.retry);
2946         return err;
2947 }
2948
2949 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2950 {
2951         nfs_fattr_init(fsinfo->fattr);
2952         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2953 }
2954
2955 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2956                 struct nfs_pathconf *pathconf)
2957 {
2958         struct nfs4_pathconf_arg args = {
2959                 .fh = fhandle,
2960                 .bitmask = server->attr_bitmask,
2961         };
2962         struct nfs4_pathconf_res res = {
2963                 .pathconf = pathconf,
2964         };
2965         struct rpc_message msg = {
2966                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2967                 .rpc_argp = &args,
2968                 .rpc_resp = &res,
2969         };
2970
2971         /* None of the pathconf attributes are mandatory to implement */
2972         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2973                 memset(pathconf, 0, sizeof(*pathconf));
2974                 return 0;
2975         }
2976
2977         nfs_fattr_init(pathconf->fattr);
2978         return nfs4_call_sync(server, &msg, &args, &res, 0);
2979 }
2980
2981 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2982                 struct nfs_pathconf *pathconf)
2983 {
2984         struct nfs4_exception exception = { };
2985         int err;
2986
2987         do {
2988                 err = nfs4_handle_exception(server,
2989                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2990                                 &exception);
2991         } while (exception.retry);
2992         return err;
2993 }
2994
2995 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2996 {
2997         struct nfs_server *server = NFS_SERVER(data->inode);
2998
2999         dprintk("--> %s\n", __func__);
3000
3001         /* nfs4_sequence_free_slot called in the read rpc_call_done */
3002         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
3003
3004         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3005                 nfs4_restart_rpc(task, server->nfs_client, &data->res.seq_res);
3006                 return -EAGAIN;
3007         }
3008
3009         nfs_invalidate_atime(data->inode);
3010         if (task->tk_status > 0)
3011                 renew_lease(server, data->timestamp);
3012         else if (task->tk_status < 0)
3013                 nfs4_sequence_free_slot(server->nfs_client, &data->res.seq_res);
3014
3015         return 0;
3016 }
3017
3018 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3019 {
3020         data->timestamp   = jiffies;
3021         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3022 }
3023
3024 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3025 {
3026         struct inode *inode = data->inode;
3027
3028         /* slot is freed in nfs_writeback_done */
3029         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3030                            task->tk_status);
3031
3032         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3033                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client,
3034                                  &data->res.seq_res);
3035                 return -EAGAIN;
3036         }
3037         if (task->tk_status >= 0) {
3038                 renew_lease(NFS_SERVER(inode), data->timestamp);
3039                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3040         }
3041         return 0;
3042 }
3043
3044 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3045 {
3046         struct nfs_server *server = NFS_SERVER(data->inode);
3047
3048         data->args.bitmask = server->cache_consistency_bitmask;
3049         data->res.server = server;
3050         data->timestamp   = jiffies;
3051
3052         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3053 }
3054
3055 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3056 {
3057         struct inode *inode = data->inode;
3058
3059         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3060                            task->tk_status);
3061         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3062                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client,
3063                                  &data->res.seq_res);
3064                 return -EAGAIN;
3065         }
3066         nfs4_sequence_free_slot(NFS_SERVER(inode)->nfs_client,
3067                                 &data->res.seq_res);
3068         nfs_refresh_inode(inode, data->res.fattr);
3069         return 0;
3070 }
3071
3072 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3073 {
3074         struct nfs_server *server = NFS_SERVER(data->inode);
3075
3076         data->args.bitmask = server->cache_consistency_bitmask;
3077         data->res.server = server;
3078         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3079 }
3080
3081 /*
3082  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3083  * standalone procedure for queueing an asynchronous RENEW.
3084  */
3085 static void nfs4_renew_done(struct rpc_task *task, void *data)
3086 {
3087         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
3088         unsigned long timestamp = (unsigned long)data;
3089
3090         if (task->tk_status < 0) {
3091                 /* Unless we're shutting down, schedule state recovery! */
3092                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3093                         nfs4_schedule_state_recovery(clp);
3094                 return;
3095         }
3096         spin_lock(&clp->cl_lock);
3097         if (time_before(clp->cl_last_renewal,timestamp))
3098                 clp->cl_last_renewal = timestamp;
3099         spin_unlock(&clp->cl_lock);
3100 }
3101
3102 static const struct rpc_call_ops nfs4_renew_ops = {
3103         .rpc_call_done = nfs4_renew_done,
3104 };
3105
3106 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3107 {
3108         struct rpc_message msg = {
3109                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3110                 .rpc_argp       = clp,
3111                 .rpc_cred       = cred,
3112         };
3113
3114         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3115                         &nfs4_renew_ops, (void *)jiffies);
3116 }
3117
3118 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3119 {
3120         struct rpc_message msg = {
3121                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3122                 .rpc_argp       = clp,
3123                 .rpc_cred       = cred,
3124         };
3125         unsigned long now = jiffies;
3126         int status;
3127
3128         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3129         if (status < 0)
3130                 return status;
3131         spin_lock(&clp->cl_lock);
3132         if (time_before(clp->cl_last_renewal,now))
3133                 clp->cl_last_renewal = now;
3134         spin_unlock(&clp->cl_lock);
3135         return 0;
3136 }
3137
3138 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3139 {
3140         return (server->caps & NFS_CAP_ACLS)
3141                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3142                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3143 }
3144
3145 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3146  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3147  * the stack.
3148  */
3149 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3150
3151 static void buf_to_pages(const void *buf, size_t buflen,
3152                 struct page **pages, unsigned int *pgbase)
3153 {
3154         const void *p = buf;
3155
3156         *pgbase = offset_in_page(buf);
3157         p -= *pgbase;
3158         while (p < buf + buflen) {
3159                 *(pages++) = virt_to_page(p);
3160                 p += PAGE_CACHE_SIZE;
3161         }
3162 }
3163
3164 struct nfs4_cached_acl {
3165         int cached;
3166         size_t len;
3167         char data[0];
3168 };
3169
3170 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3171 {
3172         struct nfs_inode *nfsi = NFS_I(inode);
3173
3174         spin_lock(&inode->i_lock);
3175         kfree(nfsi->nfs4_acl);
3176         nfsi->nfs4_acl = acl;
3177         spin_unlock(&inode->i_lock);
3178 }
3179
3180 static void nfs4_zap_acl_attr(struct inode *inode)
3181 {
3182         nfs4_set_cached_acl(inode, NULL);
3183 }
3184
3185 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3186 {
3187         struct nfs_inode *nfsi = NFS_I(inode);
3188         struct nfs4_cached_acl *acl;
3189         int ret = -ENOENT;
3190
3191         spin_lock(&inode->i_lock);
3192         acl = nfsi->nfs4_acl;
3193         if (acl == NULL)
3194                 goto out;
3195         if (buf == NULL) /* user is just asking for length */
3196                 goto out_len;
3197         if (acl->cached == 0)
3198                 goto out;
3199         ret = -ERANGE; /* see getxattr(2) man page */
3200         if (acl->len > buflen)
3201                 goto out;
3202         memcpy(buf, acl->data, acl->len);
3203 out_len:
3204         ret = acl->len;
3205 out:
3206         spin_unlock(&inode->i_lock);
3207         return ret;
3208 }
3209
3210 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3211 {
3212         struct nfs4_cached_acl *acl;
3213
3214         if (buf && acl_len <= PAGE_SIZE) {
3215                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3216                 if (acl == NULL)
3217                         goto out;
3218                 acl->cached = 1;
3219                 memcpy(acl->data, buf, acl_len);
3220         } else {
3221                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3222                 if (acl == NULL)
3223                         goto out;
3224                 acl->cached = 0;
3225         }
3226         acl->len = acl_len;
3227 out:
3228         nfs4_set_cached_acl(inode, acl);
3229 }
3230
3231 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3232 {
3233         struct page *pages[NFS4ACL_MAXPAGES];
3234         struct nfs_getaclargs args = {
3235                 .fh = NFS_FH(inode),
3236                 .acl_pages = pages,
3237                 .acl_len = buflen,
3238         };
3239         struct nfs_getaclres res = {
3240                 .acl_len = buflen,
3241         };
3242         void *resp_buf;
3243         struct rpc_message msg = {
3244                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3245                 .rpc_argp = &args,
3246                 .rpc_resp = &res,
3247         };
3248         struct page *localpage = NULL;
3249         int ret;
3250
3251         if (buflen < PAGE_SIZE) {
3252                 /* As long as we're doing a round trip to the server anyway,
3253                  * let's be prepared for a page of acl data. */
3254                 localpage = alloc_page(GFP_KERNEL);
3255                 resp_buf = page_address(localpage);
3256                 if (localpage == NULL)
3257                         return -ENOMEM;
3258                 args.acl_pages[0] = localpage;
3259                 args.acl_pgbase = 0;
3260                 args.acl_len = PAGE_SIZE;
3261         } else {
3262                 resp_buf = buf;
3263                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3264         }
3265         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3266         if (ret)
3267                 goto out_free;
3268         if (res.acl_len > args.acl_len)
3269                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3270         else
3271                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3272         if (buf) {
3273                 ret = -ERANGE;
3274                 if (res.acl_len > buflen)
3275                         goto out_free;
3276                 if (localpage)
3277                         memcpy(buf, resp_buf, res.acl_len);
3278         }
3279         ret = res.acl_len;
3280 out_free:
3281         if (localpage)
3282                 __free_page(localpage);
3283         return ret;
3284 }
3285
3286 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3287 {
3288         struct nfs4_exception exception = { };
3289         ssize_t ret;
3290         do {
3291                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3292                 if (ret >= 0)
3293                         break;
3294                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3295         } while (exception.retry);
3296         return ret;
3297 }
3298
3299 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3300 {
3301         struct nfs_server *server = NFS_SERVER(inode);
3302         int ret;
3303
3304         if (!nfs4_server_supports_acls(server))
3305                 return -EOPNOTSUPP;
3306         ret = nfs_revalidate_inode(server, inode);
3307         if (ret < 0)
3308                 return ret;
3309         ret = nfs4_read_cached_acl(inode, buf, buflen);
3310         if (ret != -ENOENT)
3311                 return ret;
3312         return nfs4_get_acl_uncached(inode, buf, buflen);
3313 }
3314
3315 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3316 {
3317         struct nfs_server *server = NFS_SERVER(inode);
3318         struct page *pages[NFS4ACL_MAXPAGES];
3319         struct nfs_setaclargs arg = {
3320                 .fh             = NFS_FH(inode),
3321                 .acl_pages      = pages,
3322                 .acl_len        = buflen,
3323         };
3324         struct nfs_setaclres res;
3325         struct rpc_message msg = {
3326                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3327                 .rpc_argp       = &arg,
3328                 .rpc_resp       = &res,
3329         };
3330         int ret;
3331
3332         if (!nfs4_server_supports_acls(server))
3333                 return -EOPNOTSUPP;
3334         nfs_inode_return_delegation(inode);
3335         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3336         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3337         nfs_access_zap_cache(inode);
3338         nfs_zap_acl_cache(inode);
3339         return ret;
3340 }
3341
3342 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3343 {
3344         struct nfs4_exception exception = { };
3345         int err;
3346         do {
3347                 err = nfs4_handle_exception(NFS_SERVER(inode),
3348                                 __nfs4_proc_set_acl(inode, buf, buflen),
3349                                 &exception);
3350         } while (exception.retry);
3351         return err;
3352 }
3353
3354 static int
3355 _nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs_client *clp, struct nfs4_state *state)
3356 {
3357         if (!clp || task->tk_status >= 0)
3358                 return 0;
3359         switch(task->tk_status) {
3360                 case -NFS4ERR_ADMIN_REVOKED:
3361                 case -NFS4ERR_BAD_STATEID:
3362                 case -NFS4ERR_OPENMODE:
3363                         if (state == NULL)
3364                                 break;
3365                         nfs4_state_mark_reclaim_nograce(clp, state);
3366                 case -NFS4ERR_STALE_CLIENTID:
3367                 case -NFS4ERR_STALE_STATEID:
3368                 case -NFS4ERR_EXPIRED:
3369                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3370                         nfs4_schedule_state_recovery(clp);
3371                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3372                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3373                         task->tk_status = 0;
3374                         return -EAGAIN;
3375 #if defined(CONFIG_NFS_V4_1)
3376                 case -NFS4ERR_BADSESSION:
3377                 case -NFS4ERR_BADSLOT:
3378                 case -NFS4ERR_BAD_HIGH_SLOT:
3379                 case -NFS4ERR_DEADSESSION:
3380                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3381                 case -NFS4ERR_SEQ_FALSE_RETRY:
3382                 case -NFS4ERR_SEQ_MISORDERED:
3383                         dprintk("%s ERROR %d, Reset session\n", __func__,
3384                                 task->tk_status);
3385                         set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state);
3386                         task->tk_status = 0;
3387                         return -EAGAIN;
3388 #endif /* CONFIG_NFS_V4_1 */
3389                 case -NFS4ERR_DELAY:
3390                         if (server)
3391                                 nfs_inc_server_stats(server, NFSIOS_DELAY);
3392                 case -NFS4ERR_GRACE:
3393                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3394                         task->tk_status = 0;
3395                         return -EAGAIN;
3396                 case -NFS4ERR_OLD_STATEID:
3397                         task->tk_status = 0;
3398                         return -EAGAIN;
3399         }
3400         task->tk_status = nfs4_map_errors(task->tk_status);
3401         return 0;
3402 }
3403
3404 static int
3405 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3406 {
3407         return _nfs4_async_handle_error(task, server, server->nfs_client, state);
3408 }
3409
3410 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3411 {
3412         nfs4_verifier sc_verifier;
3413         struct nfs4_setclientid setclientid = {
3414                 .sc_verifier = &sc_verifier,
3415                 .sc_prog = program,
3416         };
3417         struct rpc_message msg = {
3418                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3419                 .rpc_argp = &setclientid,
3420                 .rpc_resp = clp,
3421                 .rpc_cred = cred,
3422         };
3423         __be32 *p;
3424         int loop = 0;
3425         int status;
3426
3427         p = (__be32*)sc_verifier.data;
3428         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3429         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3430
3431         for(;;) {
3432                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3433                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3434                                 clp->cl_ipaddr,
3435                                 rpc_peeraddr2str(clp->cl_rpcclient,
3436                                                         RPC_DISPLAY_ADDR),
3437                                 rpc_peeraddr2str(clp->cl_rpcclient,
3438                                                         RPC_DISPLAY_PROTO),
3439                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3440                                 clp->cl_id_uniquifier);
3441                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3442                                 sizeof(setclientid.sc_netid),
3443                                 rpc_peeraddr2str(clp->cl_rpcclient,
3444                                                         RPC_DISPLAY_NETID));
3445                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3446                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3447                                 clp->cl_ipaddr, port >> 8, port & 255);
3448
3449                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3450                 if (status != -NFS4ERR_CLID_INUSE)
3451                         break;
3452                 if (signalled())
3453                         break;
3454                 if (loop++ & 1)
3455                         ssleep(clp->cl_lease_time + 1);
3456                 else
3457                         if (++clp->cl_id_uniquifier == 0)
3458                                 break;
3459         }
3460         return status;
3461 }
3462
3463 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3464 {
3465         struct nfs_fsinfo fsinfo;
3466         struct rpc_message msg = {
3467                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3468                 .rpc_argp = clp,
3469                 .rpc_resp = &fsinfo,
3470                 .rpc_cred = cred,
3471         };
3472         unsigned long now;
3473         int status;
3474
3475         now = jiffies;
3476         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3477         if (status == 0) {
3478                 spin_lock(&clp->cl_lock);
3479                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3480                 clp->cl_last_renewal = now;
3481                 spin_unlock(&clp->cl_lock);
3482         }
3483         return status;
3484 }
3485
3486 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3487 {
3488         long timeout = 0;
3489         int err;
3490         do {
3491                 err = _nfs4_proc_setclientid_confirm(clp, cred);
3492                 switch (err) {
3493                         case 0:
3494                                 return err;
3495                         case -NFS4ERR_RESOURCE:
3496                                 /* The IBM lawyers misread another document! */
3497                         case -NFS4ERR_DELAY:
3498                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3499                 }
3500         } while (err == 0);
3501         return err;
3502 }
3503
3504 struct nfs4_delegreturndata {
3505         struct nfs4_delegreturnargs args;
3506         struct nfs4_delegreturnres res;
3507         struct nfs_fh fh;
3508         nfs4_stateid stateid;
3509         unsigned long timestamp;
3510         struct nfs_fattr fattr;
3511         int rpc_status;
3512 };
3513
3514 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3515 {
3516         struct nfs4_delegreturndata *data = calldata;
3517
3518         nfs4_sequence_done_free_slot(data->res.server, &data->res.seq_res,
3519                                      task->tk_status);
3520
3521         data->rpc_status = task->tk_status;
3522         if (data->rpc_status == 0)
3523                 renew_lease(data->res.server, data->timestamp);
3524 }
3525
3526 static void nfs4_delegreturn_release(void *calldata)
3527 {
3528         kfree(calldata);
3529 }
3530
3531 #if defined(CONFIG_NFS_V4_1)
3532 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3533 {
3534         struct nfs4_delegreturndata *d_data;
3535
3536         d_data = (struct nfs4_delegreturndata *)data;
3537
3538         if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3539                                 &d_data->args.seq_args,
3540                                 &d_data->res.seq_res, 1, task))
3541                 return;
3542         rpc_call_start(task);
3543 }
3544 #endif /* CONFIG_NFS_V4_1 */
3545
3546 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3547 #if defined(CONFIG_NFS_V4_1)
3548         .rpc_call_prepare = nfs4_delegreturn_prepare,
3549 #endif /* CONFIG_NFS_V4_1 */
3550         .rpc_call_done = nfs4_delegreturn_done,
3551         .rpc_release = nfs4_delegreturn_release,
3552 };
3553
3554 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3555 {
3556         struct nfs4_delegreturndata *data;
3557         struct nfs_server *server = NFS_SERVER(inode);
3558         struct rpc_task *task;
3559         struct rpc_message msg = {
3560                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3561                 .rpc_cred = cred,
3562         };
3563         struct rpc_task_setup task_setup_data = {
3564                 .rpc_client = server->client,
3565                 .rpc_message = &msg,
3566                 .callback_ops = &nfs4_delegreturn_ops,
3567                 .flags = RPC_TASK_ASYNC,
3568         };
3569         int status = 0;
3570
3571         data = kzalloc(sizeof(*data), GFP_KERNEL);
3572         if (data == NULL)
3573                 return -ENOMEM;
3574         data->args.fhandle = &data->fh;
3575         data->args.stateid = &data->stateid;
3576         data->args.bitmask = server->attr_bitmask;
3577         nfs_copy_fh(&data->fh, NFS_FH(inode));
3578         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3579         data->res.fattr = &data->fattr;
3580         data->res.server = server;
3581         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3582         nfs_fattr_init(data->res.fattr);
3583         data->timestamp = jiffies;
3584         data->rpc_status = 0;
3585
3586         task_setup_data.callback_data = data;
3587         msg.rpc_argp = &data->args,
3588         msg.rpc_resp = &data->res,
3589         task = rpc_run_task(&task_setup_data);
3590         if (IS_ERR(task))
3591                 return PTR_ERR(task);
3592         if (!issync)
3593                 goto out;
3594         status = nfs4_wait_for_completion_rpc_task(task);
3595         if (status != 0)
3596                 goto out;
3597         status = data->rpc_status;
3598         if (status != 0)
3599                 goto out;
3600         nfs_refresh_inode(inode, &data->fattr);
3601 out:
3602         rpc_put_task(task);
3603         return status;
3604 }
3605
3606 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3607 {
3608         struct nfs_server *server = NFS_SERVER(inode);
3609         struct nfs4_exception exception = { };
3610         int err;
3611         do {
3612                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3613                 switch (err) {
3614                         case -NFS4ERR_STALE_STATEID:
3615                         case -NFS4ERR_EXPIRED:
3616                         case 0:
3617                                 return 0;
3618                 }
3619                 err = nfs4_handle_exception(server, err, &exception);
3620         } while (exception.retry);
3621         return err;
3622 }
3623
3624 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3625 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3626
3627 /*
3628  * sleep, with exponential backoff, and retry the LOCK operation.
3629  */
3630 static unsigned long
3631 nfs4_set_lock_task_retry(unsigned long timeout)
3632 {
3633         schedule_timeout_killable(timeout);
3634         timeout <<= 1;
3635         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3636                 return NFS4_LOCK_MAXTIMEOUT;
3637         return timeout;
3638 }
3639
3640 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3641 {
3642         struct inode *inode = state->inode;
3643         struct nfs_server *server = NFS_SERVER(inode);
3644         struct nfs_client *clp = server->nfs_client;
3645         struct nfs_lockt_args arg = {
3646                 .fh = NFS_FH(inode),
3647                 .fl = request,
3648         };
3649         struct nfs_lockt_res res = {
3650                 .denied = request,
3651         };
3652         struct rpc_message msg = {
3653                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3654                 .rpc_argp       = &arg,
3655                 .rpc_resp       = &res,
3656                 .rpc_cred       = state->owner->so_cred,
3657         };
3658         struct nfs4_lock_state *lsp;
3659         int status;
3660
3661         arg.lock_owner.clientid = clp->cl_clientid;
3662         status = nfs4_set_lock_state(state, request);
3663         if (status != 0)
3664                 goto out;
3665         lsp = request->fl_u.nfs4_fl.owner;
3666         arg.lock_owner.id = lsp->ls_id.id;
3667         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3668         switch (status) {
3669                 case 0:
3670                         request->fl_type = F_UNLCK;
3671                         break;
3672                 case -NFS4ERR_DENIED:
3673                         status = 0;
3674         }
3675         request->fl_ops->fl_release_private(request);
3676 out:
3677         return status;
3678 }
3679
3680 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3681 {
3682         struct nfs4_exception exception = { };
3683         int err;
3684
3685         do {
3686                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3687                                 _nfs4_proc_getlk(state, cmd, request),
3688                                 &exception);
3689         } while (exception.retry);
3690         return err;
3691 }
3692
3693 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3694 {
3695         int res = 0;
3696         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3697                 case FL_POSIX:
3698                         res = posix_lock_file_wait(file, fl);
3699                         break;
3700                 case FL_FLOCK:
3701                         res = flock_lock_file_wait(file, fl);
3702                         break;
3703                 default:
3704                         BUG();
3705         }
3706         return res;
3707 }
3708
3709 struct nfs4_unlockdata {
3710         struct nfs_locku_args arg;
3711         struct nfs_locku_res res;
3712         struct nfs4_lock_state *lsp;
3713         struct nfs_open_context *ctx;
3714         struct file_lock fl;
3715         const struct nfs_server *server;
3716         unsigned long timestamp;
3717 };
3718
3719 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3720                 struct nfs_open_context *ctx,
3721                 struct nfs4_lock_state *lsp,
3722                 struct nfs_seqid *seqid)
3723 {
3724         struct nfs4_unlockdata *p;
3725         struct inode *inode = lsp->ls_state->inode;
3726
3727         p = kzalloc(sizeof(*p), GFP_KERNEL);
3728         if (p == NULL)
3729                 return NULL;
3730         p->arg.fh = NFS_FH(inode);
3731         p->arg.fl = &p->fl;
3732         p->arg.seqid = seqid;
3733         p->res.seqid = seqid;
3734         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3735         p->arg.stateid = &lsp->ls_stateid;
3736         p->lsp = lsp;
3737         atomic_inc(&lsp->ls_count);
3738         /* Ensure we don't close file until we're done freeing locks! */
3739         p->ctx = get_nfs_open_context(ctx);
3740         memcpy(&p->fl, fl, sizeof(p->fl));
3741         p->server = NFS_SERVER(inode);
3742         return p;
3743 }
3744
3745 static void nfs4_locku_release_calldata(void *data)
3746 {
3747         struct nfs4_unlockdata *calldata = data;
3748         nfs_free_seqid(calldata->arg.seqid);
3749         nfs4_put_lock_state(calldata->lsp);
3750         put_nfs_open_context(calldata->ctx);
3751         kfree(calldata);
3752 }
3753
3754 static void nfs4_locku_done(struct rpc_task *task, void *data)
3755 {
3756         struct nfs4_unlockdata *calldata = data;
3757
3758         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3759                            task->tk_status);
3760         if (RPC_ASSASSINATED(task))
3761                 return;
3762         switch (task->tk_status) {
3763                 case 0:
3764                         memcpy(calldata->lsp->ls_stateid.data,
3765                                         calldata->res.stateid.data,
3766                                         sizeof(calldata->lsp->ls_stateid.data));
3767                         renew_lease(calldata->server, calldata->timestamp);
3768                         break;
3769                 case -NFS4ERR_BAD_STATEID:
3770                 case -NFS4ERR_OLD_STATEID:
3771                 case -NFS4ERR_STALE_STATEID:
3772                 case -NFS4ERR_EXPIRED:
3773                         break;
3774                 default:
3775                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3776                                 nfs4_restart_rpc(task,
3777                                                  calldata->server->nfs_client,
3778                                                  &calldata->res.seq_res);
3779         }
3780         nfs4_sequence_free_slot(calldata->server->nfs_client,
3781                                 &calldata->res.seq_res);
3782 }
3783
3784 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3785 {
3786         struct nfs4_unlockdata *calldata = data;
3787
3788         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3789                 return;
3790         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3791                 /* Note: exit _without_ running nfs4_locku_done */
3792                 task->tk_action = NULL;
3793                 return;
3794         }
3795         calldata->timestamp = jiffies;
3796         if (nfs4_setup_sequence(calldata->server->nfs_client,
3797                                 &calldata->arg.seq_args,
3798                                 &calldata->res.seq_res, 1, task))
3799                 return;
3800         rpc_call_start(task);
3801 }
3802
3803 static const struct rpc_call_ops nfs4_locku_ops = {
3804         .rpc_call_prepare = nfs4_locku_prepare,
3805         .rpc_call_done = nfs4_locku_done,
3806         .rpc_release = nfs4_locku_release_calldata,
3807 };
3808
3809 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3810                 struct nfs_open_context *ctx,
3811                 struct nfs4_lock_state *lsp,
3812                 struct nfs_seqid *seqid)
3813 {
3814         struct nfs4_unlockdata *data;
3815         struct rpc_message msg = {
3816                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3817                 .rpc_cred = ctx->cred,
3818         };
3819         struct rpc_task_setup task_setup_data = {
3820                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3821                 .rpc_message = &msg,
3822                 .callback_ops = &nfs4_locku_ops,
3823                 .workqueue = nfsiod_workqueue,
3824                 .flags = RPC_TASK_ASYNC,
3825         };
3826
3827         /* Ensure this is an unlock - when canceling a lock, the
3828          * canceled lock is passed in, and it won't be an unlock.
3829          */
3830         fl->fl_type = F_UNLCK;
3831
3832         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3833         if (data == NULL) {
3834                 nfs_free_seqid(seqid);
3835                 return ERR_PTR(-ENOMEM);
3836         }
3837
3838         msg.rpc_argp = &data->arg,
3839         msg.rpc_resp = &data->res,
3840         task_setup_data.callback_data = data;
3841         return rpc_run_task(&task_setup_data);
3842 }
3843
3844 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3845 {
3846         struct nfs_inode *nfsi = NFS_I(state->inode);
3847         struct nfs_seqid *seqid;
3848         struct nfs4_lock_state *lsp;
3849         struct rpc_task *task;
3850         int status = 0;
3851         unsigned char fl_flags = request->fl_flags;
3852
3853         status = nfs4_set_lock_state(state, request);
3854         /* Unlock _before_ we do the RPC call */
3855         request->fl_flags |= FL_EXISTS;
3856         down_read(&nfsi->rwsem);
3857         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3858                 up_read(&nfsi->rwsem);
3859                 goto out;
3860         }
3861         up_read(&nfsi->rwsem);
3862         if (status != 0)
3863                 goto out;
3864         /* Is this a delegated lock? */
3865         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3866                 goto out;
3867         lsp = request->fl_u.nfs4_fl.owner;
3868         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3869         status = -ENOMEM;
3870         if (seqid == NULL)
3871                 goto out;
3872         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3873         status = PTR_ERR(task);
3874         if (IS_ERR(task))
3875                 goto out;
3876         status = nfs4_wait_for_completion_rpc_task(task);
3877         rpc_put_task(task);
3878 out:
3879         request->fl_flags = fl_flags;
3880         return status;
3881 }
3882
3883 struct nfs4_lockdata {
3884         struct nfs_lock_args arg;
3885         struct nfs_lock_res res;
3886         struct nfs4_lock_state *lsp;
3887         struct nfs_open_context *ctx;
3888         struct file_lock fl;
3889         unsigned long timestamp;
3890         int rpc_status;
3891         int cancelled;
3892         struct nfs_server *server;
3893 };
3894
3895 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3896                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3897 {
3898         struct nfs4_lockdata *p;
3899         struct inode *inode = lsp->ls_state->inode;
3900         struct nfs_server *server = NFS_SERVER(inode);
3901
3902         p = kzalloc(sizeof(*p), GFP_KERNEL);
3903         if (p == NULL)
3904                 return NULL;
3905
3906         p->arg.fh = NFS_FH(inode);
3907         p->arg.fl = &p->fl;
3908         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3909         if (p->arg.open_seqid == NULL)
3910                 goto out_free;
3911         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3912         if (p->arg.lock_seqid == NULL)
3913                 goto out_free_seqid;
3914         p->arg.lock_stateid = &lsp->ls_stateid;
3915         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3916         p->arg.lock_owner.id = lsp->ls_id.id;
3917         p->res.lock_seqid = p->arg.lock_seqid;
3918         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3919         p->lsp = lsp;
3920         p->server = server;
3921         atomic_inc(&lsp->ls_count);
3922         p->ctx = get_nfs_open_context(ctx);
3923         memcpy(&p->fl, fl, sizeof(p->fl));
3924         return p;
3925 out_free_seqid:
3926         nfs_free_seqid(p->arg.open_seqid);
3927 out_free:
3928         kfree(p);
3929         return NULL;
3930 }
3931
3932 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3933 {
3934         struct nfs4_lockdata *data = calldata;
3935         struct nfs4_state *state = data->lsp->ls_state;
3936
3937         dprintk("%s: begin!\n", __func__);
3938         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3939                 return;
3940         /* Do we need to do an open_to_lock_owner? */
3941         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3942                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3943                         return;
3944                 data->arg.open_stateid = &state->stateid;
3945                 data->arg.new_lock_owner = 1;
3946                 data->res.open_seqid = data->arg.open_seqid;
3947         } else
3948                 data->arg.new_lock_owner = 0;
3949         data->timestamp = jiffies;
3950         if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
3951                                 &data->res.seq_res, 1, task))
3952                 return;
3953         rpc_call_start(task);
3954         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3955 }
3956
3957 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3958 {
3959         struct nfs4_lockdata *data = calldata;
3960
3961         dprintk("%s: begin!\n", __func__);
3962
3963         nfs4_sequence_done_free_slot(data->server, &data->res.seq_res,
3964                                      task->tk_status);
3965
3966         data->rpc_status = task->tk_status;
3967         if (RPC_ASSASSINATED(task))
3968                 goto out;
3969         if (data->arg.new_lock_owner != 0) {
3970                 if (data->rpc_status == 0)
3971                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3972                 else
3973                         goto out;
3974         }
3975         if (data->rpc_status == 0) {
3976                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3977                                         sizeof(data->lsp->ls_stateid.data));
3978                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3979                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3980         }
3981 out:
3982         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3983 }
3984
3985 static void nfs4_lock_release(void *calldata)
3986 {
3987         struct nfs4_lockdata *data = calldata;
3988
3989         dprintk("%s: begin!\n", __func__);
3990         nfs_free_seqid(data->arg.open_seqid);
3991         if (data->cancelled != 0) {
3992                 struct rpc_task *task;
3993                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3994                                 data->arg.lock_seqid);
3995                 if (!IS_ERR(task))
3996                         rpc_put_task(task);
3997                 dprintk("%s: cancelling lock!\n", __func__);
3998         } else
3999                 nfs_free_seqid(data->arg.lock_seqid);
4000         nfs4_put_lock_state(data->lsp);
4001         put_nfs_open_context(data->ctx);
4002         kfree(data);
4003         dprintk("%s: done!\n", __func__);
4004 }
4005
4006 static const struct rpc_call_ops nfs4_lock_ops = {
4007         .rpc_call_prepare = nfs4_lock_prepare,
4008         .rpc_call_done = nfs4_lock_done,
4009         .rpc_release = nfs4_lock_release,
4010 };
4011
4012 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
4013 {
4014         struct nfs4_lockdata *data;
4015         struct rpc_task *task;
4016         struct rpc_message msg = {
4017                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4018                 .rpc_cred = state->owner->so_cred,
4019         };
4020         struct rpc_task_setup task_setup_data = {
4021                 .rpc_client = NFS_CLIENT(state->inode),
4022                 .rpc_message = &msg,
4023                 .callback_ops = &nfs4_lock_ops,
4024                 .workqueue = nfsiod_workqueue,
4025                 .flags = RPC_TASK_ASYNC,
4026         };
4027         int ret;
4028
4029         dprintk("%s: begin!\n", __func__);
4030         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4031                         fl->fl_u.nfs4_fl.owner);
4032         if (data == NULL)
4033                 return -ENOMEM;
4034         if (IS_SETLKW(cmd))
4035                 data->arg.block = 1;
4036         if (reclaim != 0)
4037                 data->arg.reclaim = 1;
4038         msg.rpc_argp = &data->arg,
4039         msg.rpc_resp = &data->res,
4040         task_setup_data.callback_data = data;
4041         task = rpc_run_task(&task_setup_data);
4042         if (IS_ERR(task))
4043                 return PTR_ERR(task);
4044         ret = nfs4_wait_for_completion_rpc_task(task);
4045         if (ret == 0) {
4046                 ret = data->rpc_status;
4047         } else
4048                 data->cancelled = 1;
4049         rpc_put_task(task);
4050         dprintk("%s: done, ret = %d!\n", __func__, ret);
4051         return ret;
4052 }
4053
4054 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4055 {
4056         struct nfs_server *server = NFS_SERVER(state->inode);
4057         struct nfs4_exception exception = { };
4058         int err;
4059
4060         do {
4061                 /* Cache the lock if possible... */
4062                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4063                         return 0;
4064                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
4065                 if (err != -NFS4ERR_DELAY)
4066                         break;
4067                 nfs4_handle_exception(server, err, &exception);
4068         } while (exception.retry);
4069         return err;
4070 }
4071
4072 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4073 {
4074         struct nfs_server *server = NFS_SERVER(state->inode);
4075         struct nfs4_exception exception = { };
4076         int err;
4077
4078         err = nfs4_set_lock_state(state, request);
4079         if (err != 0)
4080                 return err;
4081         do {
4082                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4083                         return 0;
4084                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
4085                 switch (err) {
4086                 default:
4087                         goto out;
4088                 case -NFS4ERR_GRACE:
4089                 case -NFS4ERR_DELAY:
4090                         nfs4_handle_exception(server, err, &exception);
4091                         err = 0;
4092                 }
4093         } while (exception.retry);
4094 out:
4095         return err;
4096 }
4097
4098 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4099 {
4100         struct nfs_inode *nfsi = NFS_I(state->inode);
4101         unsigned char fl_flags = request->fl_flags;
4102         int status;
4103
4104         /* Is this a delegated open? */
4105         status = nfs4_set_lock_state(state, request);
4106         if (status != 0)
4107                 goto out;
4108         request->fl_flags |= FL_ACCESS;
4109         status = do_vfs_lock(request->fl_file, request);
4110         if (status < 0)
4111                 goto out;
4112         down_read(&nfsi->rwsem);
4113         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4114                 /* Yes: cache locks! */
4115                 /* ...but avoid races with delegation recall... */
4116                 request->fl_flags = fl_flags & ~FL_SLEEP;
4117                 status = do_vfs_lock(request->fl_file, request);
4118                 goto out_unlock;
4119         }
4120         status = _nfs4_do_setlk(state, cmd, request, 0);
4121         if (status != 0)
4122                 goto out_unlock;
4123         /* Note: we always want to sleep here! */
4124         request->fl_flags = fl_flags | FL_SLEEP;
4125         if (do_vfs_lock(request->fl_file, request) < 0)
4126                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4127 out_unlock:
4128         up_read(&nfsi->rwsem);
4129 out:
4130         request->fl_flags = fl_flags;
4131         return status;
4132 }
4133
4134 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4135 {
4136         struct nfs4_exception exception = { };
4137         int err;
4138
4139         do {
4140                 err = _nfs4_proc_setlk(state, cmd, request);
4141                 if (err == -NFS4ERR_DENIED)
4142                         err = -EAGAIN;
4143                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4144                                 err, &exception);
4145         } while (exception.retry);
4146         return err;
4147 }
4148
4149 static int
4150 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4151 {
4152         struct nfs_open_context *ctx;
4153         struct nfs4_state *state;
4154         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4155         int status;
4156
4157         /* verify open state */
4158         ctx = nfs_file_open_context(filp);
4159         state = ctx->state;
4160
4161         if (request->fl_start < 0 || request->fl_end < 0)
4162                 return -EINVAL;
4163
4164         if (IS_GETLK(cmd)) {
4165                 if (state != NULL)
4166                         return nfs4_proc_getlk(state, F_GETLK, request);
4167                 return 0;
4168         }
4169
4170         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4171                 return -EINVAL;
4172
4173         if (request->fl_type == F_UNLCK) {
4174                 if (state != NULL)
4175                         return nfs4_proc_unlck(state, cmd, request);
4176                 return 0;
4177         }
4178
4179         if (state == NULL)
4180                 return -ENOLCK;
4181         do {
4182                 status = nfs4_proc_setlk(state, cmd, request);
4183                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4184                         break;
4185                 timeout = nfs4_set_lock_task_retry(timeout);
4186                 status = -ERESTARTSYS;
4187                 if (signalled())
4188                         break;
4189         } while(status < 0);
4190         return status;
4191 }
4192
4193 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4194 {
4195         struct nfs_server *server = NFS_SERVER(state->inode);
4196         struct nfs4_exception exception = { };
4197         int err;
4198
4199         err = nfs4_set_lock_state(state, fl);
4200         if (err != 0)
4201                 goto out;
4202         do {
4203                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
4204                 switch (err) {
4205                         default:
4206                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4207                                                 __func__, err);
4208                         case 0:
4209                         case -ESTALE:
4210                                 goto out;
4211                         case -NFS4ERR_EXPIRED:
4212                         case -NFS4ERR_STALE_CLIENTID:
4213                         case -NFS4ERR_STALE_STATEID:
4214                                 nfs4_schedule_state_recovery(server->nfs_client);
4215                                 goto out;
4216                         case -ERESTARTSYS:
4217                                 /*
4218                                  * The show must go on: exit, but mark the
4219                                  * stateid as needing recovery.
4220                                  */
4221                         case -NFS4ERR_ADMIN_REVOKED:
4222                         case -NFS4ERR_BAD_STATEID:
4223                         case -NFS4ERR_OPENMODE:
4224                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4225                                 err = 0;
4226                                 goto out;
4227                         case -ENOMEM:
4228                         case -NFS4ERR_DENIED:
4229                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4230                                 err = 0;
4231                                 goto out;
4232                         case -NFS4ERR_DELAY:
4233                                 break;
4234                 }
4235                 err = nfs4_handle_exception(server, err, &exception);
4236         } while (exception.retry);
4237 out:
4238         return err;
4239 }
4240
4241 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4242
4243 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4244                 size_t buflen, int flags)
4245 {
4246         struct inode *inode = dentry->d_inode;
4247
4248         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4249                 return -EOPNOTSUPP;
4250
4251         return nfs4_proc_set_acl(inode, buf, buflen);
4252 }
4253
4254 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4255  * and that's what we'll do for e.g. user attributes that haven't been set.
4256  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4257  * attributes in kernel-managed attribute namespaces. */
4258 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4259                 size_t buflen)
4260 {
4261         struct inode *inode = dentry->d_inode;
4262
4263         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4264                 return -EOPNOTSUPP;
4265
4266         return nfs4_proc_get_acl(inode, buf, buflen);
4267 }
4268
4269 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4270 {
4271         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4272
4273         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4274                 return 0;
4275         if (buf && buflen < len)
4276                 return -ERANGE;
4277         if (buf)
4278                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4279         return len;
4280 }
4281
4282 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4283 {
4284         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4285                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4286                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4287                 return;
4288
4289         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4290                 NFS_ATTR_FATTR_NLINK;
4291         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4292         fattr->nlink = 2;
4293 }
4294
4295 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4296                 struct nfs4_fs_locations *fs_locations, struct page *page)
4297 {
4298         struct nfs_server *server = NFS_SERVER(dir);
4299         u32 bitmask[2] = {
4300                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4301                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4302         };
4303         struct nfs4_fs_locations_arg args = {
4304                 .dir_fh = NFS_FH(dir),
4305                 .name = name,
4306                 .page = page,
4307                 .bitmask = bitmask,
4308         };
4309         struct nfs4_fs_locations_res res = {
4310                 .fs_locations = fs_locations,
4311         };
4312         struct rpc_message msg = {
4313                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4314                 .rpc_argp = &args,
4315                 .rpc_resp = &res,
4316         };
4317         int status;
4318
4319         dprintk("%s: start\n", __func__);
4320         nfs_fattr_init(&fs_locations->fattr);
4321         fs_locations->server = server;
4322         fs_locations->nlocations = 0;
4323         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4324         nfs_fixup_referral_attributes(&fs_locations->fattr);
4325         dprintk("%s: returned status = %d\n", __func__, status);
4326         return status;
4327 }
4328
4329 #ifdef CONFIG_NFS_V4_1
4330 /*
4331  * nfs4_proc_exchange_id()
4332  *
4333  * Since the clientid has expired, all compounds using sessions
4334  * associated with the stale clientid will be returning
4335  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4336  * be in some phase of session reset.
4337  */
4338 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4339 {
4340         nfs4_verifier verifier;
4341         struct nfs41_exchange_id_args args = {
4342                 .client = clp,
4343                 .flags = clp->cl_exchange_flags,
4344         };
4345         struct nfs41_exchange_id_res res = {
4346                 .client = clp,
4347         };
4348         int status;
4349         struct rpc_message msg = {
4350                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4351                 .rpc_argp = &args,
4352                 .rpc_resp = &res,
4353                 .rpc_cred = cred,
4354         };
4355         __be32 *p;
4356
4357         dprintk("--> %s\n", __func__);
4358         BUG_ON(clp == NULL);
4359
4360         p = (u32 *)verifier.data;
4361         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4362         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4363         args.verifier = &verifier;
4364
4365         while (1) {
4366                 args.id_len = scnprintf(args.id, sizeof(args.id),
4367                                         "%s/%s %u",
4368                                         clp->cl_ipaddr,
4369                                         rpc_peeraddr2str(clp->cl_rpcclient,
4370                                                          RPC_DISPLAY_ADDR),
4371                                         clp->cl_id_uniquifier);
4372
4373                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4374
4375                 if (status != NFS4ERR_CLID_INUSE)
4376                         break;
4377
4378                 if (signalled())
4379                         break;
4380
4381                 if (++clp->cl_id_uniquifier == 0)
4382                         break;
4383         }
4384
4385         dprintk("<-- %s status= %d\n", __func__, status);
4386         return status;
4387 }
4388
4389 struct nfs4_get_lease_time_data {
4390         struct nfs4_get_lease_time_args *args;
4391         struct nfs4_get_lease_time_res *res;
4392         struct nfs_client *clp;
4393 };
4394
4395 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4396                                         void *calldata)
4397 {
4398         int ret;
4399         struct nfs4_get_lease_time_data *data =
4400                         (struct nfs4_get_lease_time_data *)calldata;
4401
4402         dprintk("--> %s\n", __func__);
4403         /* just setup sequence, do not trigger session recovery
4404            since we're invoked within one */
4405         ret = nfs41_setup_sequence(data->clp->cl_session,
4406                                         &data->args->la_seq_args,
4407                                         &data->res->lr_seq_res, 0, task);
4408
4409         BUG_ON(ret == -EAGAIN);
4410         rpc_call_start(task);
4411         dprintk("<-- %s\n", __func__);
4412 }
4413
4414 /*
4415  * Called from nfs4_state_manager thread for session setup, so don't recover
4416  * from sequence operation or clientid errors.
4417  */
4418 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4419 {
4420         struct nfs4_get_lease_time_data *data =
4421                         (struct nfs4_get_lease_time_data *)calldata;
4422
4423         dprintk("--> %s\n", __func__);
4424         nfs41_sequence_done(data->clp, &data->res->lr_seq_res, task->tk_status);
4425         switch (task->tk_status) {
4426         case -NFS4ERR_DELAY:
4427         case -NFS4ERR_GRACE:
4428                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4429                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4430                 task->tk_status = 0;
4431                 rpc_restart_call(task);
4432                 return;
4433         }
4434         nfs41_sequence_free_slot(data->clp, &data->res->lr_seq_res);
4435         dprintk("<-- %s\n", __func__);
4436 }
4437
4438 struct rpc_call_ops nfs4_get_lease_time_ops = {
4439         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4440         .rpc_call_done = nfs4_get_lease_time_done,
4441 };
4442
4443 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4444 {
4445         struct rpc_task *task;
4446         struct nfs4_get_lease_time_args args;
4447         struct nfs4_get_lease_time_res res = {
4448                 .lr_fsinfo = fsinfo,
4449         };
4450         struct nfs4_get_lease_time_data data = {
4451                 .args = &args,
4452                 .res = &res,
4453                 .clp = clp,
4454         };
4455         struct rpc_message msg = {
4456                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4457                 .rpc_argp = &args,
4458                 .rpc_resp = &res,
4459         };
4460         struct rpc_task_setup task_setup = {
4461                 .rpc_client = clp->cl_rpcclient,
4462                 .rpc_message = &msg,
4463                 .callback_ops = &nfs4_get_lease_time_ops,
4464                 .callback_data = &data
4465         };
4466         int status;
4467
4468         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4469         dprintk("--> %s\n", __func__);
4470         task = rpc_run_task(&task_setup);
4471
4472         if (IS_ERR(task))
4473                 status = PTR_ERR(task);
4474         else {
4475                 status = task->tk_status;
4476                 rpc_put_task(task);
4477         }
4478         dprintk("<-- %s return %d\n", __func__, status);
4479
4480         return status;
4481 }
4482
4483 /*
4484  * Reset a slot table
4485  */
4486 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, int max_slots,
4487                 int old_max_slots, int ivalue)
4488 {
4489         int i;
4490         int ret = 0;
4491
4492         dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__, max_slots, tbl);
4493
4494         /*
4495          * Until we have dynamic slot table adjustment, insist
4496          * upon the same slot table size
4497          */
4498         if (max_slots != old_max_slots) {
4499                 dprintk("%s reset slot table does't match old\n",
4500                         __func__);
4501                 ret = -EINVAL; /*XXX NFS4ERR_REQ_TOO_BIG ? */
4502                 goto out;
4503         }
4504         spin_lock(&tbl->slot_tbl_lock);
4505         for (i = 0; i < max_slots; ++i)
4506                 tbl->slots[i].seq_nr = ivalue;
4507         tbl->highest_used_slotid = -1;
4508         spin_unlock(&tbl->slot_tbl_lock);
4509         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4510                 tbl, tbl->slots, tbl->max_slots);
4511 out:
4512         dprintk("<-- %s: return %d\n", __func__, ret);
4513         return ret;
4514 }
4515
4516 /*
4517  * Reset the forechannel and backchannel slot tables
4518  */
4519 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4520 {
4521         int status;
4522
4523         status = nfs4_reset_slot_table(&session->fc_slot_table,
4524                         session->fc_attrs.max_reqs,
4525                         session->fc_slot_table.max_slots,
4526                         1);
4527         if (status)
4528                 return status;
4529
4530         status = nfs4_reset_slot_table(&session->bc_slot_table,
4531                         session->bc_attrs.max_reqs,
4532                         session->bc_slot_table.max_slots,
4533                         0);
4534         return status;
4535 }
4536
4537 /* Destroy the slot table */
4538 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4539 {
4540         if (session->fc_slot_table.slots != NULL) {
4541                 kfree(session->fc_slot_table.slots);
4542                 session->fc_slot_table.slots = NULL;
4543         }
4544         if (session->bc_slot_table.slots != NULL) {
4545                 kfree(session->bc_slot_table.slots);
4546                 session->bc_slot_table.slots = NULL;
4547         }
4548         return;
4549 }
4550
4551 /*
4552  * Initialize slot table
4553  */
4554 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4555                 int max_slots, int ivalue)
4556 {
4557         int i;
4558         struct nfs4_slot *slot;
4559         int ret = -ENOMEM;
4560
4561         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4562
4563         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4564
4565         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_KERNEL);
4566         if (!slot)
4567                 goto out;
4568         for (i = 0; i < max_slots; ++i)
4569                 slot[i].seq_nr = ivalue;
4570         ret = 0;
4571
4572         spin_lock(&tbl->slot_tbl_lock);
4573         if (tbl->slots != NULL) {
4574                 spin_unlock(&tbl->slot_tbl_lock);
4575                 dprintk("%s: slot table already initialized. tbl=%p slots=%p\n",
4576                         __func__, tbl, tbl->slots);
4577                 WARN_ON(1);
4578                 goto out_free;
4579         }
4580         tbl->max_slots = max_slots;
4581         tbl->slots = slot;
4582         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4583         spin_unlock(&tbl->slot_tbl_lock);
4584         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4585                 tbl, tbl->slots, tbl->max_slots);
4586 out:
4587         dprintk("<-- %s: return %d\n", __func__, ret);
4588         return ret;
4589
4590 out_free:
4591         kfree(slot);
4592         goto out;
4593 }
4594
4595 /*
4596  * Initialize the forechannel and backchannel tables
4597  */
4598 static int nfs4_init_slot_tables(struct nfs4_session *session)
4599 {
4600         int status;
4601
4602         status = nfs4_init_slot_table(&session->fc_slot_table,
4603                         session->fc_attrs.max_reqs, 1);
4604         if (status)
4605                 return status;
4606
4607         status = nfs4_init_slot_table(&session->bc_slot_table,
4608                         session->bc_attrs.max_reqs, 0);
4609         if (status)
4610                 nfs4_destroy_slot_tables(session);
4611
4612         return status;
4613 }
4614
4615 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4616 {
4617         struct nfs4_session *session;
4618         struct nfs4_slot_table *tbl;
4619
4620         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4621         if (!session)
4622                 return NULL;
4623
4624         /*
4625          * The create session reply races with the server back
4626          * channel probe. Mark the client NFS_CS_SESSION_INITING
4627          * so that the client back channel can find the
4628          * nfs_client struct
4629          */
4630         clp->cl_cons_state = NFS_CS_SESSION_INITING;
4631
4632         tbl = &session->fc_slot_table;
4633         spin_lock_init(&tbl->slot_tbl_lock);
4634         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4635
4636         tbl = &session->bc_slot_table;
4637         spin_lock_init(&tbl->slot_tbl_lock);
4638         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4639
4640         session->clp = clp;
4641         return session;
4642 }
4643
4644 void nfs4_destroy_session(struct nfs4_session *session)
4645 {
4646         nfs4_proc_destroy_session(session);
4647         dprintk("%s Destroy backchannel for xprt %p\n",
4648                 __func__, session->clp->cl_rpcclient->cl_xprt);
4649         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4650                                 NFS41_BC_MIN_CALLBACKS);
4651         nfs4_destroy_slot_tables(session);
4652         kfree(session);
4653 }
4654
4655 /*
4656  * Initialize the values to be used by the client in CREATE_SESSION
4657  * If nfs4_init_session set the fore channel request and response sizes,
4658  * use them.
4659  *
4660  * Set the back channel max_resp_sz_cached to zero to force the client to
4661  * always set csa_cachethis to FALSE because the current implementation
4662  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4663  */
4664 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4665 {
4666         struct nfs4_session *session = args->client->cl_session;
4667         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4668                      mxresp_sz = session->fc_attrs.max_resp_sz;
4669
4670         if (mxrqst_sz == 0)
4671                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4672         if (mxresp_sz == 0)
4673                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4674         /* Fore channel attributes */
4675         args->fc_attrs.headerpadsz = 0;
4676         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4677         args->fc_attrs.max_resp_sz = mxresp_sz;
4678         args->fc_attrs.max_resp_sz_cached = mxresp_sz;
4679         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4680         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4681
4682         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4683                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4684                 __func__,
4685                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4686                 args->fc_attrs.max_resp_sz_cached, args->fc_attrs.max_ops,
4687                 args->fc_attrs.max_reqs);
4688
4689         /* Back channel attributes */
4690         args->bc_attrs.headerpadsz = 0;
4691         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4692         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4693         args->bc_attrs.max_resp_sz_cached = 0;
4694         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4695         args->bc_attrs.max_reqs = 1;
4696
4697         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4698                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4699                 __func__,
4700                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4701                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4702                 args->bc_attrs.max_reqs);
4703 }
4704
4705 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4706 {
4707         if (rcvd <= sent)
4708                 return 0;
4709         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4710                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4711         return -EINVAL;
4712 }
4713
4714 #define _verify_fore_channel_attr(_name_) \
4715         _verify_channel_attr("fore", #_name_, \
4716                              args->fc_attrs._name_, \
4717                              session->fc_attrs._name_)
4718
4719 #define _verify_back_channel_attr(_name_) \
4720         _verify_channel_attr("back", #_name_, \
4721                              args->bc_attrs._name_, \
4722                              session->bc_attrs._name_)
4723
4724 /*
4725  * The server is not allowed to increase the fore channel header pad size,
4726  * maximum response size, or maximum number of operations.
4727  *
4728  * The back channel attributes are only negotiatied down: We send what the
4729  * (back channel) server insists upon.
4730  */
4731 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4732                                      struct nfs4_session *session)
4733 {
4734         int ret = 0;
4735
4736         ret |= _verify_fore_channel_attr(headerpadsz);
4737         ret |= _verify_fore_channel_attr(max_resp_sz);
4738         ret |= _verify_fore_channel_attr(max_ops);
4739
4740         ret |= _verify_back_channel_attr(headerpadsz);
4741         ret |= _verify_back_channel_attr(max_rqst_sz);
4742         ret |= _verify_back_channel_attr(max_resp_sz);
4743         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4744         ret |= _verify_back_channel_attr(max_ops);
4745         ret |= _verify_back_channel_attr(max_reqs);
4746
4747         return ret;
4748 }
4749
4750 static int _nfs4_proc_create_session(struct nfs_client *clp)
4751 {
4752         struct nfs4_session *session = clp->cl_session;
4753         struct nfs41_create_session_args args = {
4754                 .client = clp,
4755                 .cb_program = NFS4_CALLBACK,
4756         };
4757         struct nfs41_create_session_res res = {
4758                 .client = clp,
4759         };
4760         struct rpc_message msg = {
4761                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4762                 .rpc_argp = &args,
4763                 .rpc_resp = &res,
4764         };
4765         int status;
4766
4767         nfs4_init_channel_attrs(&args);
4768         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4769
4770         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4771
4772         if (!status)
4773                 /* Verify the session's negotiated channel_attrs values */
4774                 status = nfs4_verify_channel_attrs(&args, session);
4775         if (!status) {
4776                 /* Increment the clientid slot sequence id */
4777                 clp->cl_seqid++;
4778         }
4779
4780         return status;
4781 }
4782
4783 /*
4784  * Issues a CREATE_SESSION operation to the server.
4785  * It is the responsibility of the caller to verify the session is
4786  * expired before calling this routine.
4787  */
4788 int nfs4_proc_create_session(struct nfs_client *clp, int reset)
4789 {
4790         int status;
4791         unsigned *ptr;
4792         struct nfs_fsinfo fsinfo;
4793         struct nfs4_session *session = clp->cl_session;
4794
4795         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4796
4797         status = _nfs4_proc_create_session(clp);
4798         if (status)
4799                 goto out;
4800
4801         /* Init or reset the fore channel */
4802         if (reset)
4803                 status = nfs4_reset_slot_tables(session);
4804         else
4805                 status = nfs4_init_slot_tables(session);
4806         dprintk("fore channel slot table initialization returned %d\n", status);
4807         if (status)
4808                 goto out;
4809
4810         ptr = (unsigned *)&session->sess_id.data[0];
4811         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4812                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4813
4814         if (reset)
4815                 /* Lease time is aleady set */
4816                 goto out;
4817
4818         /* Get the lease time */
4819         status = nfs4_proc_get_lease_time(clp, &fsinfo);
4820         if (status == 0) {
4821                 /* Update lease time and schedule renewal */
4822                 spin_lock(&clp->cl_lock);
4823                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4824                 clp->cl_last_renewal = jiffies;
4825                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
4826                 spin_unlock(&clp->cl_lock);
4827
4828                 nfs4_schedule_state_renewal(clp);
4829         }
4830 out:
4831         dprintk("<-- %s\n", __func__);
4832         return status;
4833 }
4834
4835 /*
4836  * Issue the over-the-wire RPC DESTROY_SESSION.
4837  * The caller must serialize access to this routine.
4838  */
4839 int nfs4_proc_destroy_session(struct nfs4_session *session)
4840 {
4841         int status = 0;
4842         struct rpc_message msg;
4843
4844         dprintk("--> nfs4_proc_destroy_session\n");
4845
4846         /* session is still being setup */
4847         if (session->clp->cl_cons_state != NFS_CS_READY)
4848                 return status;
4849
4850         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4851         msg.rpc_argp = session;
4852         msg.rpc_resp = NULL;
4853         msg.rpc_cred = NULL;
4854         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4855
4856         if (status)
4857                 printk(KERN_WARNING
4858                         "Got error %d from the server on DESTROY_SESSION. "
4859                         "Session has been destroyed regardless...\n", status);
4860
4861         dprintk("<-- nfs4_proc_destroy_session\n");
4862         return status;
4863 }
4864
4865 int nfs4_init_session(struct nfs_server *server)
4866 {
4867         struct nfs_client *clp = server->nfs_client;
4868         int ret;
4869
4870         if (!nfs4_has_session(clp))
4871                 return 0;
4872
4873         clp->cl_session->fc_attrs.max_rqst_sz = server->wsize;
4874         clp->cl_session->fc_attrs.max_resp_sz = server->rsize;
4875         ret = nfs4_recover_expired_lease(server);
4876         if (!ret)
4877                 ret = nfs4_check_client_ready(clp);
4878         return ret;
4879 }
4880
4881 /*
4882  * Renew the cl_session lease.
4883  */
4884 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
4885 {
4886         struct nfs4_sequence_args args;
4887         struct nfs4_sequence_res res;
4888
4889         struct rpc_message msg = {
4890                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4891                 .rpc_argp = &args,
4892                 .rpc_resp = &res,
4893                 .rpc_cred = cred,
4894         };
4895
4896         args.sa_cache_this = 0;
4897
4898         return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
4899                                        &res, 0);
4900 }
4901
4902 void nfs41_sequence_call_done(struct rpc_task *task, void *data)
4903 {
4904         struct nfs_client *clp = (struct nfs_client *)data;
4905
4906         nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);
4907
4908         if (task->tk_status < 0) {
4909                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
4910
4911                 if (_nfs4_async_handle_error(task, NULL, clp, NULL)
4912                                                                 == -EAGAIN) {
4913                         nfs4_restart_rpc(task, clp, task->tk_msg.rpc_resp);
4914                         return;
4915                 }
4916         }
4917         nfs41_sequence_free_slot(clp, task->tk_msg.rpc_resp);
4918         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
4919
4920         kfree(task->tk_msg.rpc_argp);
4921         kfree(task->tk_msg.rpc_resp);
4922
4923         dprintk("<-- %s\n", __func__);
4924 }
4925
4926 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
4927 {
4928         struct nfs_client *clp;
4929         struct nfs4_sequence_args *args;
4930         struct nfs4_sequence_res *res;
4931
4932         clp = (struct nfs_client *)data;
4933         args = task->tk_msg.rpc_argp;
4934         res = task->tk_msg.rpc_resp;
4935
4936         if (nfs4_setup_sequence(clp, args, res, 0, task))
4937                 return;
4938         rpc_call_start(task);
4939 }
4940
4941 static const struct rpc_call_ops nfs41_sequence_ops = {
4942         .rpc_call_done = nfs41_sequence_call_done,
4943         .rpc_call_prepare = nfs41_sequence_prepare,
4944 };
4945
4946 static int nfs41_proc_async_sequence(struct nfs_client *clp,
4947                                      struct rpc_cred *cred)
4948 {
4949         struct nfs4_sequence_args *args;
4950         struct nfs4_sequence_res *res;
4951         struct rpc_message msg = {
4952                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4953                 .rpc_cred = cred,
4954         };
4955
4956         args = kzalloc(sizeof(*args), GFP_KERNEL);
4957         if (!args)
4958                 return -ENOMEM;
4959         res = kzalloc(sizeof(*res), GFP_KERNEL);
4960         if (!res) {
4961                 kfree(args);
4962                 return -ENOMEM;
4963         }
4964         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
4965         msg.rpc_argp = args;
4966         msg.rpc_resp = res;
4967
4968         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
4969                               &nfs41_sequence_ops, (void *)clp);
4970 }
4971
4972 #endif /* CONFIG_NFS_V4_1 */
4973
4974 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
4975         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4976         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4977         .recover_open   = nfs4_open_reclaim,
4978         .recover_lock   = nfs4_lock_reclaim,
4979         .establish_clid = nfs4_init_clientid,
4980         .get_clid_cred  = nfs4_get_setclientid_cred,
4981 };
4982
4983 #if defined(CONFIG_NFS_V4_1)
4984 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
4985         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4986         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4987         .recover_open   = nfs4_open_reclaim,
4988         .recover_lock   = nfs4_lock_reclaim,
4989         .establish_clid = nfs41_init_clientid,
4990         .get_clid_cred  = nfs4_get_exchange_id_cred,
4991 };
4992 #endif /* CONFIG_NFS_V4_1 */
4993
4994 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
4995         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
4996         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
4997         .recover_open   = nfs4_open_expired,
4998         .recover_lock   = nfs4_lock_expired,
4999         .establish_clid = nfs4_init_clientid,
5000         .get_clid_cred  = nfs4_get_setclientid_cred,
5001 };
5002
5003 #if defined(CONFIG_NFS_V4_1)
5004 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5005         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5006         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5007         .recover_open   = nfs4_open_expired,
5008         .recover_lock   = nfs4_lock_expired,
5009         .establish_clid = nfs41_init_clientid,
5010         .get_clid_cred  = nfs4_get_exchange_id_cred,
5011 };
5012 #endif /* CONFIG_NFS_V4_1 */
5013
5014 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5015         .sched_state_renewal = nfs4_proc_async_renew,
5016         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5017         .renew_lease = nfs4_proc_renew,
5018 };
5019
5020 #if defined(CONFIG_NFS_V4_1)
5021 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5022         .sched_state_renewal = nfs41_proc_async_sequence,
5023         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5024         .renew_lease = nfs4_proc_sequence,
5025 };
5026 #endif
5027
5028 /*
5029  * Per minor version reboot and network partition recovery ops
5030  */
5031
5032 struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[] = {
5033         &nfs40_reboot_recovery_ops,
5034 #if defined(CONFIG_NFS_V4_1)
5035         &nfs41_reboot_recovery_ops,
5036 #endif
5037 };
5038
5039 struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[] = {
5040         &nfs40_nograce_recovery_ops,
5041 #if defined(CONFIG_NFS_V4_1)
5042         &nfs41_nograce_recovery_ops,
5043 #endif
5044 };
5045
5046 struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[] = {
5047         &nfs40_state_renewal_ops,
5048 #if defined(CONFIG_NFS_V4_1)
5049         &nfs41_state_renewal_ops,
5050 #endif
5051 };
5052
5053 static const struct inode_operations nfs4_file_inode_operations = {
5054         .permission     = nfs_permission,
5055         .getattr        = nfs_getattr,
5056         .setattr        = nfs_setattr,
5057         .getxattr       = nfs4_getxattr,
5058         .setxattr       = nfs4_setxattr,
5059         .listxattr      = nfs4_listxattr,
5060 };
5061
5062 const struct nfs_rpc_ops nfs_v4_clientops = {
5063         .version        = 4,                    /* protocol version */
5064         .dentry_ops     = &nfs4_dentry_operations,
5065         .dir_inode_ops  = &nfs4_dir_inode_operations,
5066         .file_inode_ops = &nfs4_file_inode_operations,
5067         .getroot        = nfs4_proc_get_root,
5068         .getattr        = nfs4_proc_getattr,
5069         .setattr        = nfs4_proc_setattr,
5070         .lookupfh       = nfs4_proc_lookupfh,
5071         .lookup         = nfs4_proc_lookup,
5072         .access         = nfs4_proc_access,
5073         .readlink       = nfs4_proc_readlink,
5074         .create         = nfs4_proc_create,
5075         .remove         = nfs4_proc_remove,
5076         .unlink_setup   = nfs4_proc_unlink_setup,
5077         .unlink_done    = nfs4_proc_unlink_done,
5078         .rename         = nfs4_proc_rename,
5079         .link           = nfs4_proc_link,
5080         .symlink        = nfs4_proc_symlink,
5081         .mkdir          = nfs4_proc_mkdir,
5082         .rmdir          = nfs4_proc_remove,
5083         .readdir        = nfs4_proc_readdir,
5084         .mknod          = nfs4_proc_mknod,
5085         .statfs         = nfs4_proc_statfs,
5086         .fsinfo         = nfs4_proc_fsinfo,
5087         .pathconf       = nfs4_proc_pathconf,
5088         .set_capabilities = nfs4_server_capabilities,
5089         .decode_dirent  = nfs4_decode_dirent,
5090         .read_setup     = nfs4_proc_read_setup,
5091         .read_done      = nfs4_read_done,
5092         .write_setup    = nfs4_proc_write_setup,
5093         .write_done     = nfs4_write_done,
5094         .commit_setup   = nfs4_proc_commit_setup,
5095         .commit_done    = nfs4_commit_done,
5096         .lock           = nfs4_proc_lock,
5097         .clear_acl_cache = nfs4_zap_acl_attr,
5098         .close_context  = nfs4_close_context,
5099 };
5100
5101 /*
5102  * Local variables:
5103  *  c-basic-offset: 8
5104  * End:
5105  */