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                         nfs4_schedule_state_recovery(clp);
 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  * Must be called while holding tbl->slot_tbl_lock
 323  */
 324 static void
 325 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 326 {
 327         int slotid = free_slotid;
 328
 329         /* clear used bit in bitmap */
 330         __clear_bit(slotid, tbl->used_slots);
 331
 332         /* update highest_used_slotid when it is freed */
 333         if (slotid == tbl->highest_used_slotid) {
 334                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 335                 if (slotid < tbl->max_slots)
 336                         tbl->highest_used_slotid = slotid;
 337                 else
 338                         tbl->highest_used_slotid = -1;
 339         }
 340         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 341                 free_slotid, tbl->highest_used_slotid);
 342 }
 343
 344 static void nfs41_sequence_free_slot(const struct nfs_client *clp,
 345                               struct nfs4_sequence_res *res)
 346 {
 347         struct nfs4_slot_table *tbl;
 348
 349         tbl = &clp->cl_session->fc_slot_table;
 350         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
 351                 /* just wake up the next guy waiting since
 352                  * we may have not consumed a slot after all */
 353                 dprintk("%s: No slot\n", __func__);
 354                 return;
 355         }
 356
 357         spin_lock(&tbl->slot_tbl_lock);
 358         nfs4_free_slot(tbl, res->sr_slotid);
 359
 360         /* Signal state manager thread if session is drained */
 361         if (test_bit(NFS4CLNT_SESSION_DRAINING, &clp->cl_state)) {
 362                 if (tbl->highest_used_slotid == -1) {
 363                         dprintk("%s COMPLETE: Session Drained\n", __func__);
 364                         complete(&clp->cl_session->complete);
 365                 }
 366         } else
 367                 rpc_wake_up_next(&tbl->slot_tbl_waitq);
 368         spin_unlock(&tbl->slot_tbl_lock);
 369         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 370 }
 371
 372 static void nfs41_sequence_done(struct nfs_client *clp,
 373                                 struct nfs4_sequence_res *res,
 374                                 int rpc_status)
 375 {
 376         unsigned long timestamp;
 377         struct nfs4_slot_table *tbl;
 378         struct nfs4_slot *slot;
 379
 380         /*
 381          * sr_status remains 1 if an RPC level error occurred. The server
 382          * may or may not have processed the sequence operation..
 383          * Proceed as if the server received and processed the sequence
 384          * operation.
 385          */
 386         if (res->sr_status == 1)
 387                 res->sr_status = NFS_OK;
 388
 389         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 390         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
 391                 goto out;
 392
 393         /* Check the SEQUENCE operation status */
 394         if (res->sr_status == 0) {
 395                 tbl = &clp->cl_session->fc_slot_table;
 396                 slot = tbl->slots + res->sr_slotid;
 397                 /* Update the slot's sequence and clientid lease timer */
 398                 ++slot->seq_nr;
 399                 timestamp = res->sr_renewal_time;
 400                 spin_lock(&clp->cl_lock);
 401                 if (time_before(clp->cl_last_renewal, timestamp))
 402                         clp->cl_last_renewal = timestamp;
 403                 spin_unlock(&clp->cl_lock);
 404                 /* Check sequence flags */
 405                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 406         }
 407 out:
 408         /* The session may be reset by one of the error handlers. */
 409         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 410         nfs41_sequence_free_slot(clp, res);
 411 }
 412
 413 /*
 414  * nfs4_find_slot - efficiently look for a free slot
 415  *
 416  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 417  * If found, we mark the slot as used, update the highest_used_slotid,
 418  * and respectively set up the sequence operation args.
 419  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 420  *
 421  * Note: must be called with under the slot_tbl_lock.
 422  */
 423 static u8
 424 nfs4_find_slot(struct nfs4_slot_table *tbl, struct rpc_task *task)
 425 {
 426         int slotid;
 427         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 428         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 429
 430         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 431                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 432                 tbl->max_slots);
 433         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 434         if (slotid >= tbl->max_slots)
 435                 goto out;
 436         __set_bit(slotid, tbl->used_slots);
 437         if (slotid > tbl->highest_used_slotid)
 438                 tbl->highest_used_slotid = slotid;
 439         ret_id = slotid;
 440 out:
 441         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 442                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 443         return ret_id;
 444 }
 445
 446 static int nfs41_setup_sequence(struct nfs4_session *session,
 447                                 struct nfs4_sequence_args *args,
 448                                 struct nfs4_sequence_res *res,
 449                                 int cache_reply,
 450                                 struct rpc_task *task)
 451 {
 452         struct nfs4_slot *slot;
 453         struct nfs4_slot_table *tbl;
 454         u8 slotid;
 455
 456         dprintk("--> %s\n", __func__);
 457         /* slot already allocated? */
 458         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
 459                 return 0;
 460
 461         memset(res, 0, sizeof(*res));
 462         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 463         tbl = &session->fc_slot_table;
 464
 465         spin_lock(&tbl->slot_tbl_lock);
 466         if (test_bit(NFS4CLNT_SESSION_DRAINING, &session->clp->cl_state)) {
 467                 /*
 468                  * The state manager will wait until the slot table is empty.
 469                  * Schedule the reset thread
 470                  */
 471                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 472                 spin_unlock(&tbl->slot_tbl_lock);
 473                 dprintk("%s Schedule Session Reset\n", __func__);
 474                 return -EAGAIN;
 475         }
 476
 477         slotid = nfs4_find_slot(tbl, task);
 478         if (slotid == NFS4_MAX_SLOT_TABLE) {
 479                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 480                 spin_unlock(&tbl->slot_tbl_lock);
 481                 dprintk("<-- %s: no free slots\n", __func__);
 482                 return -EAGAIN;
 483         }
 484         spin_unlock(&tbl->slot_tbl_lock);
 485
 486         slot = tbl->slots + slotid;
 487         args->sa_session = session;
 488         args->sa_slotid = slotid;
 489         args->sa_cache_this = cache_reply;
 490
 491         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 492
 493         res->sr_session = session;
 494         res->sr_slotid = slotid;
 495         res->sr_renewal_time = jiffies;
 496         /*
 497          * sr_status is only set in decode_sequence, and so will remain
 498          * set to 1 if an rpc level failure occurs.
 499          */
 500         res->sr_status = 1;
 501         return 0;
 502 }
 503
 504 int nfs4_setup_sequence(struct nfs_client *clp,
 505                         struct nfs4_sequence_args *args,
 506                         struct nfs4_sequence_res *res,
 507                         int cache_reply,
 508                         struct rpc_task *task)
 509 {
 510         int ret = 0;
 511
 512         dprintk("--> %s clp %p session %p sr_slotid %d\n",
 513                 __func__, clp, clp->cl_session, res->sr_slotid);
 514
 515         if (!nfs4_has_session(clp))
 516                 goto out;
 517         ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
 518                                    task);
 519         if (ret && ret != -EAGAIN) {
 520                 /* terminate rpc task */
 521                 task->tk_status = ret;
 522                 task->tk_action = NULL;
 523         }
 524 out:
 525         dprintk("<-- %s status=%d\n", __func__, ret);
 526         return ret;
 527 }
 528
 529 struct nfs41_call_sync_data {
 530         struct nfs_client *clp;
 531         struct nfs4_sequence_args *seq_args;
 532         struct nfs4_sequence_res *seq_res;
 533         int cache_reply;
 534 };
 535
 536 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 537 {
 538         struct nfs41_call_sync_data *data = calldata;
 539
 540         dprintk("--> %s data->clp->cl_session %p\n", __func__,
 541                 data->clp->cl_session);
 542         if (nfs4_setup_sequence(data->clp, data->seq_args,
 543                                 data->seq_res, data->cache_reply, task))
 544                 return;
 545         rpc_call_start(task);
 546 }
 547
 548 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 549 {
 550         struct nfs41_call_sync_data *data = calldata;
 551
 552         nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
 553 }
 554
 555 struct rpc_call_ops nfs41_call_sync_ops = {
 556         .rpc_call_prepare = nfs41_call_sync_prepare,
 557         .rpc_call_done = nfs41_call_sync_done,
 558 };
 559
 560 static int nfs4_call_sync_sequence(struct nfs_client *clp,
 561                                    struct rpc_clnt *clnt,
 562                                    struct rpc_message *msg,
 563                                    struct nfs4_sequence_args *args,
 564                                    struct nfs4_sequence_res *res,
 565                                    int cache_reply)
 566 {
 567         int ret;
 568         struct rpc_task *task;
 569         struct nfs41_call_sync_data data = {
 570                 .clp = clp,
 571                 .seq_args = args,
 572                 .seq_res = res,
 573                 .cache_reply = cache_reply,
 574         };
 575         struct rpc_task_setup task_setup = {
 576                 .rpc_client = clnt,
 577                 .rpc_message = msg,
 578                 .callback_ops = &nfs41_call_sync_ops,
 579                 .callback_data = &data
 580         };
 581
 582         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 583         task = rpc_run_task(&task_setup);
 584         if (IS_ERR(task))
 585                 ret = PTR_ERR(task);
 586         else {
 587                 ret = task->tk_status;
 588                 rpc_put_task(task);
 589         }
 590         return ret;
 591 }
 592
 593 int _nfs4_call_sync_session(struct nfs_server *server,
 594                             struct rpc_message *msg,
 595                             struct nfs4_sequence_args *args,
 596                             struct nfs4_sequence_res *res,
 597                             int cache_reply)
 598 {
 599         return nfs4_call_sync_sequence(server->nfs_client, server->client,
 600                                        msg, args, res, cache_reply);
 601 }
 602
 603 #endif /* CONFIG_NFS_V4_1 */
 604
 605 int _nfs4_call_sync(struct nfs_server *server,
 606                     struct rpc_message *msg,
 607                     struct nfs4_sequence_args *args,
 608                     struct nfs4_sequence_res *res,
 609                     int cache_reply)
 610 {
 611         args->sa_session = res->sr_session = NULL;
 612         return rpc_call_sync(server->client, msg, 0);
 613 }
 614
 615 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 616         (server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
 617                         &(res)->seq_res, (cache_reply))
 618
 619 static void nfs4_sequence_done(const struct nfs_server *server,
 620                                struct nfs4_sequence_res *res, int rpc_status)
 621 {
 622 #ifdef CONFIG_NFS_V4_1
 623         if (nfs4_has_session(server->nfs_client))
 624                 nfs41_sequence_done(server->nfs_client, res, rpc_status);
 625 #endif /* CONFIG_NFS_V4_1 */
 626 }
 627
 628 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 629 {
 630         struct nfs_inode *nfsi = NFS_I(dir);
 631
 632         spin_lock(&dir->i_lock);
 633         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 634         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 635                 nfs_force_lookup_revalidate(dir);
 636         nfsi->change_attr = cinfo->after;
 637         spin_unlock(&dir->i_lock);
 638 }
 639
 640 struct nfs4_opendata {
 641         struct kref kref;
 642         struct nfs_openargs o_arg;
 643         struct nfs_openres o_res;
 644         struct nfs_open_confirmargs c_arg;
 645         struct nfs_open_confirmres c_res;
 646         struct nfs_fattr f_attr;
 647         struct nfs_fattr dir_attr;
 648         struct path path;
 649         struct dentry *dir;
 650         struct nfs4_state_owner *owner;
 651         struct nfs4_state *state;
 652         struct iattr attrs;
 653         unsigned long timestamp;
 654         unsigned int rpc_done : 1;
 655         int rpc_status;
 656         int cancelled;
 657 };
 658
 659
 660 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 661 {
 662         p->o_res.f_attr = &p->f_attr;
 663         p->o_res.dir_attr = &p->dir_attr;
 664         p->o_res.seqid = p->o_arg.seqid;
 665         p->c_res.seqid = p->c_arg.seqid;
 666         p->o_res.server = p->o_arg.server;
 667         nfs_fattr_init(&p->f_attr);
 668         nfs_fattr_init(&p->dir_attr);
 669         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
 670 }
 671
 672 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 673                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 674                 const struct iattr *attrs)
 675 {
 676         struct dentry *parent = dget_parent(path->dentry);
 677         struct inode *dir = parent->d_inode;
 678         struct nfs_server *server = NFS_SERVER(dir);
 679         struct nfs4_opendata *p;
 680
 681         p = kzalloc(sizeof(*p), GFP_KERNEL);
 682         if (p == NULL)
 683                 goto err;
 684         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 685         if (p->o_arg.seqid == NULL)
 686                 goto err_free;
 687         p->path.mnt = mntget(path->mnt);
 688         p->path.dentry = dget(path->dentry);
 689         p->dir = parent;
 690         p->owner = sp;
 691         atomic_inc(&sp->so_count);
 692         p->o_arg.fh = NFS_FH(dir);
 693         p->o_arg.open_flags = flags;
 694         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 695         p->o_arg.clientid = server->nfs_client->cl_clientid;
 696         p->o_arg.id = sp->so_owner_id.id;
 697         p->o_arg.name = &p->path.dentry->d_name;
 698         p->o_arg.server = server;
 699         p->o_arg.bitmask = server->attr_bitmask;
 700         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 701         if (flags & O_EXCL) {
 702                 if (nfs4_has_persistent_session(server->nfs_client)) {
 703                         /* GUARDED */
 704                         p->o_arg.u.attrs = &p->attrs;
 705                         memcpy(&p->attrs, attrs, sizeof(p->attrs));
 706                 } else { /* EXCLUSIVE4_1 */
 707                         u32 *s = (u32 *) p->o_arg.u.verifier.data;
 708                         s[0] = jiffies;
 709                         s[1] = current->pid;
 710                 }
 711         } else if (flags & O_CREAT) {
 712                 p->o_arg.u.attrs = &p->attrs;
 713                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 714         }
 715         p->c_arg.fh = &p->o_res.fh;
 716         p->c_arg.stateid = &p->o_res.stateid;
 717         p->c_arg.seqid = p->o_arg.seqid;
 718         nfs4_init_opendata_res(p);
 719         kref_init(&p->kref);
 720         return p;
 721 err_free:
 722         kfree(p);
 723 err:
 724         dput(parent);
 725         return NULL;
 726 }
 727
 728 static void nfs4_opendata_free(struct kref *kref)
 729 {
 730         struct nfs4_opendata *p = container_of(kref,
 731                         struct nfs4_opendata, kref);
 732
 733         nfs_free_seqid(p->o_arg.seqid);
 734         if (p->state != NULL)
 735                 nfs4_put_open_state(p->state);
 736         nfs4_put_state_owner(p->owner);
 737         dput(p->dir);
 738         path_put(&p->path);
 739         kfree(p);
 740 }
 741
 742 static void nfs4_opendata_put(struct nfs4_opendata *p)
 743 {
 744         if (p != NULL)
 745                 kref_put(&p->kref, nfs4_opendata_free);
 746 }
 747
 748 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 749 {
 750         int ret;
 751
 752         ret = rpc_wait_for_completion_task(task);
 753         return ret;
 754 }
 755
 756 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 757 {
 758         int ret = 0;
 759
 760         if (open_mode & O_EXCL)
 761                 goto out;
 762         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 763                 case FMODE_READ:
 764                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 765                         break;
 766                 case FMODE_WRITE:
 767                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 768                         break;
 769                 case FMODE_READ|FMODE_WRITE:
 770                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 771         }
 772 out:
 773         return ret;
 774 }
 775
 776 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 777 {
 778         if ((delegation->type & fmode) != fmode)
 779                 return 0;
 780         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 781                 return 0;
 782         nfs_mark_delegation_referenced(delegation);
 783         return 1;
 784 }
 785
 786 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 787 {
 788         switch (fmode) {
 789                 case FMODE_WRITE:
 790                         state->n_wronly++;
 791                         break;
 792                 case FMODE_READ:
 793                         state->n_rdonly++;
 794                         break;
 795                 case FMODE_READ|FMODE_WRITE:
 796                         state->n_rdwr++;
 797         }
 798         nfs4_state_set_mode_locked(state, state->state | fmode);
 799 }
 800
 801 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 802 {
 803         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 804                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 805         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 806         switch (fmode) {
 807                 case FMODE_READ:
 808                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 809                         break;
 810                 case FMODE_WRITE:
 811                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 812                         break;
 813                 case FMODE_READ|FMODE_WRITE:
 814                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 815         }
 816 }
 817
 818 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 819 {
 820         write_seqlock(&state->seqlock);
 821         nfs_set_open_stateid_locked(state, stateid, fmode);
 822         write_sequnlock(&state->seqlock);
 823 }
 824
 825 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 826 {
 827         /*
 828          * Protect the call to nfs4_state_set_mode_locked and
 829          * serialise the stateid update
 830          */
 831         write_seqlock(&state->seqlock);
 832         if (deleg_stateid != NULL) {
 833                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 834                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 835         }
 836         if (open_stateid != NULL)
 837                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 838         write_sequnlock(&state->seqlock);
 839         spin_lock(&state->owner->so_lock);
 840         update_open_stateflags(state, fmode);
 841         spin_unlock(&state->owner->so_lock);
 842 }
 843
 844 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 845 {
 846         struct nfs_inode *nfsi = NFS_I(state->inode);
 847         struct nfs_delegation *deleg_cur;
 848         int ret = 0;
 849
 850         fmode &= (FMODE_READ|FMODE_WRITE);
 851
 852         rcu_read_lock();
 853         deleg_cur = rcu_dereference(nfsi->delegation);
 854         if (deleg_cur == NULL)
 855                 goto no_delegation;
 856
 857         spin_lock(&deleg_cur->lock);
 858         if (nfsi->delegation != deleg_cur ||
 859             (deleg_cur->type & fmode) != fmode)
 860                 goto no_delegation_unlock;
 861
 862         if (delegation == NULL)
 863                 delegation = &deleg_cur->stateid;
 864         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 865                 goto no_delegation_unlock;
 866
 867         nfs_mark_delegation_referenced(deleg_cur);
 868         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 869         ret = 1;
 870 no_delegation_unlock:
 871         spin_unlock(&deleg_cur->lock);
 872 no_delegation:
 873         rcu_read_unlock();
 874
 875         if (!ret && open_stateid != NULL) {
 876                 __update_open_stateid(state, open_stateid, NULL, fmode);
 877                 ret = 1;
 878         }
 879
 880         return ret;
 881 }
 882
 883
 884 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 885 {
 886         struct nfs_delegation *delegation;
 887
 888         rcu_read_lock();
 889         delegation = rcu_dereference(NFS_I(inode)->delegation);
 890         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 891                 rcu_read_unlock();
 892                 return;
 893         }
 894         rcu_read_unlock();
 895         nfs_inode_return_delegation(inode);
 896 }
 897
 898 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 899 {
 900         struct nfs4_state *state = opendata->state;
 901         struct nfs_inode *nfsi = NFS_I(state->inode);
 902         struct nfs_delegation *delegation;
 903         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 904         fmode_t fmode = opendata->o_arg.fmode;
 905         nfs4_stateid stateid;
 906         int ret = -EAGAIN;
 907
 908         for (;;) {
 909                 if (can_open_cached(state, fmode, open_mode)) {
 910                         spin_lock(&state->owner->so_lock);
 911                         if (can_open_cached(state, fmode, open_mode)) {
 912                                 update_open_stateflags(state, fmode);
 913                                 spin_unlock(&state->owner->so_lock);
 914                                 goto out_return_state;
 915                         }
 916                         spin_unlock(&state->owner->so_lock);
 917                 }
 918                 rcu_read_lock();
 919                 delegation = rcu_dereference(nfsi->delegation);
 920                 if (delegation == NULL ||
 921                     !can_open_delegated(delegation, fmode)) {
 922                         rcu_read_unlock();
 923                         break;
 924                 }
 925                 /* Save the delegation */
 926                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 927                 rcu_read_unlock();
 928                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 929                 if (ret != 0)
 930                         goto out;
 931                 ret = -EAGAIN;
 932
 933                 /* Try to update the stateid using the delegation */
 934                 if (update_open_stateid(state, NULL, &stateid, fmode))
 935                         goto out_return_state;
 936         }
 937 out:
 938         return ERR_PTR(ret);
 939 out_return_state:
 940         atomic_inc(&state->count);
 941         return state;
 942 }
 943
 944 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 945 {
 946         struct inode *inode;
 947         struct nfs4_state *state = NULL;
 948         struct nfs_delegation *delegation;
 949         int ret;
 950
 951         if (!data->rpc_done) {
 952                 state = nfs4_try_open_cached(data);
 953                 goto out;
 954         }
 955
 956         ret = -EAGAIN;
 957         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 958                 goto err;
 959         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 960         ret = PTR_ERR(inode);
 961         if (IS_ERR(inode))
 962                 goto err;
 963         ret = -ENOMEM;
 964         state = nfs4_get_open_state(inode, data->owner);
 965         if (state == NULL)
 966                 goto err_put_inode;
 967         if (data->o_res.delegation_type != 0) {
 968                 int delegation_flags = 0;
 969
 970                 rcu_read_lock();
 971                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 972                 if (delegation)
 973                         delegation_flags = delegation->flags;
 974                 rcu_read_unlock();
 975                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
 976                         nfs_inode_set_delegation(state->inode,
 977                                         data->owner->so_cred,
 978                                         &data->o_res);
 979                 else
 980                         nfs_inode_reclaim_delegation(state->inode,
 981                                         data->owner->so_cred,
 982                                         &data->o_res);
 983         }
 984
 985         update_open_stateid(state, &data->o_res.stateid, NULL,
 986                         data->o_arg.fmode);
 987         iput(inode);
 988 out:
 989         return state;
 990 err_put_inode:
 991         iput(inode);
 992 err:
 993         return ERR_PTR(ret);
 994 }
 995
 996 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 997 {
 998         struct nfs_inode *nfsi = NFS_I(state->inode);
 999         struct nfs_open_context *ctx;
1000
1001         spin_lock(&state->inode->i_lock);
1002         list_for_each_entry(ctx, &nfsi->open_files, list) {
1003                 if (ctx->state != state)
1004                         continue;
1005                 get_nfs_open_context(ctx);
1006                 spin_unlock(&state->inode->i_lock);
1007                 return ctx;
1008         }
1009         spin_unlock(&state->inode->i_lock);
1010         return ERR_PTR(-ENOENT);
1011 }
1012
1013 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1014 {
1015         struct nfs4_opendata *opendata;
1016
1017         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
1018         if (opendata == NULL)
1019                 return ERR_PTR(-ENOMEM);
1020         opendata->state = state;
1021         atomic_inc(&state->count);
1022         return opendata;
1023 }
1024
1025 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1026 {
1027         struct nfs4_state *newstate;
1028         int ret;
1029
1030         opendata->o_arg.open_flags = 0;
1031         opendata->o_arg.fmode = fmode;
1032         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1033         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1034         nfs4_init_opendata_res(opendata);
1035         ret = _nfs4_proc_open(opendata);
1036         if (ret != 0)
1037                 return ret;
1038         newstate = nfs4_opendata_to_nfs4_state(opendata);
1039         if (IS_ERR(newstate))
1040                 return PTR_ERR(newstate);
1041         nfs4_close_state(&opendata->path, newstate, fmode);
1042         *res = newstate;
1043         return 0;
1044 }
1045
1046 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1047 {
1048         struct nfs4_state *newstate;
1049         int ret;
1050
1051         /* memory barrier prior to reading state->n_* */
1052         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1053         smp_rmb();
1054         if (state->n_rdwr != 0) {
1055                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1056                 if (ret != 0)
1057                         return ret;
1058                 if (newstate != state)
1059                         return -ESTALE;
1060         }
1061         if (state->n_wronly != 0) {
1062                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1063                 if (ret != 0)
1064                         return ret;
1065                 if (newstate != state)
1066                         return -ESTALE;
1067         }
1068         if (state->n_rdonly != 0) {
1069                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1070                 if (ret != 0)
1071                         return ret;
1072                 if (newstate != state)
1073                         return -ESTALE;
1074         }
1075         /*
1076          * We may have performed cached opens for all three recoveries.
1077          * Check if we need to update the current stateid.
1078          */
1079         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1080             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1081                 write_seqlock(&state->seqlock);
1082                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1083                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1084                 write_sequnlock(&state->seqlock);
1085         }
1086         return 0;
1087 }
1088
1089 /*
1090  * OPEN_RECLAIM:
1091  *      reclaim state on the server after a reboot.
1092  */
1093 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1094 {
1095         struct nfs_delegation *delegation;
1096         struct nfs4_opendata *opendata;
1097         fmode_t delegation_type = 0;
1098         int status;
1099
1100         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1101         if (IS_ERR(opendata))
1102                 return PTR_ERR(opendata);
1103         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1104         opendata->o_arg.fh = NFS_FH(state->inode);
1105         rcu_read_lock();
1106         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1107         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1108                 delegation_type = delegation->type;
1109         rcu_read_unlock();
1110         opendata->o_arg.u.delegation_type = delegation_type;
1111         status = nfs4_open_recover(opendata, state);
1112         nfs4_opendata_put(opendata);
1113         return status;
1114 }
1115
1116 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1117 {
1118         struct nfs_server *server = NFS_SERVER(state->inode);
1119         struct nfs4_exception exception = { };
1120         int err;
1121         do {
1122                 err = _nfs4_do_open_reclaim(ctx, state);
1123                 if (err != -NFS4ERR_DELAY)
1124                         break;
1125                 nfs4_handle_exception(server, err, &exception);
1126         } while (exception.retry);
1127         return err;
1128 }
1129
1130 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1131 {
1132         struct nfs_open_context *ctx;
1133         int ret;
1134
1135         ctx = nfs4_state_find_open_context(state);
1136         if (IS_ERR(ctx))
1137                 return PTR_ERR(ctx);
1138         ret = nfs4_do_open_reclaim(ctx, state);
1139         put_nfs_open_context(ctx);
1140         return ret;
1141 }
1142
1143 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1144 {
1145         struct nfs4_opendata *opendata;
1146         int ret;
1147
1148         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1149         if (IS_ERR(opendata))
1150                 return PTR_ERR(opendata);
1151         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1152         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1153                         sizeof(opendata->o_arg.u.delegation.data));
1154         ret = nfs4_open_recover(opendata, state);
1155         nfs4_opendata_put(opendata);
1156         return ret;
1157 }
1158
1159 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1160 {
1161         struct nfs4_exception exception = { };
1162         struct nfs_server *server = NFS_SERVER(state->inode);
1163         int err;
1164         do {
1165                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1166                 switch (err) {
1167                         case 0:
1168                         case -ENOENT:
1169                         case -ESTALE:
1170                                 goto out;
1171                         case -NFS4ERR_BADSESSION:
1172                         case -NFS4ERR_BADSLOT:
1173                         case -NFS4ERR_BAD_HIGH_SLOT:
1174                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1175                         case -NFS4ERR_DEADSESSION:
1176                                 nfs4_schedule_state_recovery(
1177                                         server->nfs_client);
1178                                 goto out;
1179                         case -NFS4ERR_STALE_CLIENTID:
1180                         case -NFS4ERR_STALE_STATEID:
1181                         case -NFS4ERR_EXPIRED:
1182                                 /* Don't recall a delegation if it was lost */
1183                                 nfs4_schedule_state_recovery(server->nfs_client);
1184                                 goto out;
1185                         case -ERESTARTSYS:
1186                                 /*
1187                                  * The show must go on: exit, but mark the
1188                                  * stateid as needing recovery.
1189                                  */
1190                         case -NFS4ERR_ADMIN_REVOKED:
1191                         case -NFS4ERR_BAD_STATEID:
1192                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1193                         case -ENOMEM:
1194                                 err = 0;
1195                                 goto out;
1196                 }
1197                 err = nfs4_handle_exception(server, err, &exception);
1198         } while (exception.retry);
1199 out:
1200         return err;
1201 }
1202
1203 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1204 {
1205         struct nfs4_opendata *data = calldata;
1206
1207         data->rpc_status = task->tk_status;
1208         if (RPC_ASSASSINATED(task))
1209                 return;
1210         if (data->rpc_status == 0) {
1211                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1212                                 sizeof(data->o_res.stateid.data));
1213                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1214                 renew_lease(data->o_res.server, data->timestamp);
1215                 data->rpc_done = 1;
1216         }
1217 }
1218
1219 static void nfs4_open_confirm_release(void *calldata)
1220 {
1221         struct nfs4_opendata *data = calldata;
1222         struct nfs4_state *state = NULL;
1223
1224         /* If this request hasn't been cancelled, do nothing */
1225         if (data->cancelled == 0)
1226                 goto out_free;
1227         /* In case of error, no cleanup! */
1228         if (!data->rpc_done)
1229                 goto out_free;
1230         state = nfs4_opendata_to_nfs4_state(data);
1231         if (!IS_ERR(state))
1232                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1233 out_free:
1234         nfs4_opendata_put(data);
1235 }
1236
1237 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1238         .rpc_call_done = nfs4_open_confirm_done,
1239         .rpc_release = nfs4_open_confirm_release,
1240 };
1241
1242 /*
1243  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1244  */
1245 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1246 {
1247         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1248         struct rpc_task *task;
1249         struct  rpc_message msg = {
1250                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1251                 .rpc_argp = &data->c_arg,
1252                 .rpc_resp = &data->c_res,
1253                 .rpc_cred = data->owner->so_cred,
1254         };
1255         struct rpc_task_setup task_setup_data = {
1256                 .rpc_client = server->client,
1257                 .rpc_message = &msg,
1258                 .callback_ops = &nfs4_open_confirm_ops,
1259                 .callback_data = data,
1260                 .workqueue = nfsiod_workqueue,
1261                 .flags = RPC_TASK_ASYNC,
1262         };
1263         int status;
1264
1265         kref_get(&data->kref);
1266         data->rpc_done = 0;
1267         data->rpc_status = 0;
1268         data->timestamp = jiffies;
1269         task = rpc_run_task(&task_setup_data);
1270         if (IS_ERR(task))
1271                 return PTR_ERR(task);
1272         status = nfs4_wait_for_completion_rpc_task(task);
1273         if (status != 0) {
1274                 data->cancelled = 1;
1275                 smp_wmb();
1276         } else
1277                 status = data->rpc_status;
1278         rpc_put_task(task);
1279         return status;
1280 }
1281
1282 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1283 {
1284         struct nfs4_opendata *data = calldata;
1285         struct nfs4_state_owner *sp = data->owner;
1286
1287         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1288                 return;
1289         /*
1290          * Check if we still need to send an OPEN call, or if we can use
1291          * a delegation instead.
1292          */
1293         if (data->state != NULL) {
1294                 struct nfs_delegation *delegation;
1295
1296                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1297                         goto out_no_action;
1298                 rcu_read_lock();
1299                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1300                 if (delegation != NULL &&
1301                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1302                         rcu_read_unlock();
1303                         goto out_no_action;
1304                 }
1305                 rcu_read_unlock();
1306         }
1307         /* Update sequence id. */
1308         data->o_arg.id = sp->so_owner_id.id;
1309         data->o_arg.clientid = sp->so_client->cl_clientid;
1310         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1311                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1312                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1313         }
1314         data->timestamp = jiffies;
1315         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
1316                                 &data->o_arg.seq_args,
1317                                 &data->o_res.seq_res, 1, task))
1318                 return;
1319         rpc_call_start(task);
1320         return;
1321 out_no_action:
1322         task->tk_action = NULL;
1323
1324 }
1325
1326 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1327 {
1328         struct nfs4_opendata *data = calldata;
1329
1330         data->rpc_status = task->tk_status;
1331
1332         nfs4_sequence_done(data->o_arg.server, &data->o_res.seq_res,
1333                         task->tk_status);
1334
1335         if (RPC_ASSASSINATED(task))
1336                 return;
1337         if (task->tk_status == 0) {
1338                 switch (data->o_res.f_attr->mode & S_IFMT) {
1339                         case S_IFREG:
1340                                 break;
1341                         case S_IFLNK:
1342                                 data->rpc_status = -ELOOP;
1343                                 break;
1344                         case S_IFDIR:
1345                                 data->rpc_status = -EISDIR;
1346                                 break;
1347                         default:
1348                                 data->rpc_status = -ENOTDIR;
1349                 }
1350                 renew_lease(data->o_res.server, data->timestamp);
1351                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1352                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1353         }
1354         data->rpc_done = 1;
1355 }
1356
1357 static void nfs4_open_release(void *calldata)
1358 {
1359         struct nfs4_opendata *data = calldata;
1360         struct nfs4_state *state = NULL;
1361
1362         /* If this request hasn't been cancelled, do nothing */
1363         if (data->cancelled == 0)
1364                 goto out_free;
1365         /* In case of error, no cleanup! */
1366         if (data->rpc_status != 0 || !data->rpc_done)
1367                 goto out_free;
1368         /* In case we need an open_confirm, no cleanup! */
1369         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1370                 goto out_free;
1371         state = nfs4_opendata_to_nfs4_state(data);
1372         if (!IS_ERR(state))
1373                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1374 out_free:
1375         nfs4_opendata_put(data);
1376 }
1377
1378 static const struct rpc_call_ops nfs4_open_ops = {
1379         .rpc_call_prepare = nfs4_open_prepare,
1380         .rpc_call_done = nfs4_open_done,
1381         .rpc_release = nfs4_open_release,
1382 };
1383
1384 /*
1385  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1386  */
1387 static int _nfs4_proc_open(struct nfs4_opendata *data)
1388 {
1389         struct inode *dir = data->dir->d_inode;
1390         struct nfs_server *server = NFS_SERVER(dir);
1391         struct nfs_openargs *o_arg = &data->o_arg;
1392         struct nfs_openres *o_res = &data->o_res;
1393         struct rpc_task *task;
1394         struct rpc_message msg = {
1395                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1396                 .rpc_argp = o_arg,
1397                 .rpc_resp = o_res,
1398                 .rpc_cred = data->owner->so_cred,
1399         };
1400         struct rpc_task_setup task_setup_data = {
1401                 .rpc_client = server->client,
1402                 .rpc_message = &msg,
1403                 .callback_ops = &nfs4_open_ops,
1404                 .callback_data = data,
1405                 .workqueue = nfsiod_workqueue,
1406                 .flags = RPC_TASK_ASYNC,
1407         };
1408         int status;
1409
1410         kref_get(&data->kref);
1411         data->rpc_done = 0;
1412         data->rpc_status = 0;
1413         data->cancelled = 0;
1414         task = rpc_run_task(&task_setup_data);
1415         if (IS_ERR(task))
1416                 return PTR_ERR(task);
1417         status = nfs4_wait_for_completion_rpc_task(task);
1418         if (status != 0) {
1419                 data->cancelled = 1;
1420                 smp_wmb();
1421         } else
1422                 status = data->rpc_status;
1423         rpc_put_task(task);
1424         if (status != 0 || !data->rpc_done)
1425                 return status;
1426
1427         if (o_res->fh.size == 0)
1428                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1429
1430         if (o_arg->open_flags & O_CREAT) {
1431                 update_changeattr(dir, &o_res->cinfo);
1432                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1433         } else
1434                 nfs_refresh_inode(dir, o_res->dir_attr);
1435         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1436                 status = _nfs4_proc_open_confirm(data);
1437                 if (status != 0)
1438                         return status;
1439         }
1440         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1441                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1442         return 0;
1443 }
1444
1445 static int nfs4_recover_expired_lease(struct nfs_server *server)
1446 {
1447         struct nfs_client *clp = server->nfs_client;
1448         unsigned int loop;
1449         int ret;
1450
1451         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1452                 ret = nfs4_wait_clnt_recover(clp);
1453                 if (ret != 0)
1454                         break;
1455                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1456                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1457                         break;
1458                 nfs4_schedule_state_recovery(clp);
1459                 ret = -EIO;
1460         }
1461         return ret;
1462 }
1463
1464 /*
1465  * OPEN_EXPIRED:
1466  *      reclaim state on the server after a network partition.
1467  *      Assumes caller holds the appropriate lock
1468  */
1469 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1470 {
1471         struct nfs4_opendata *opendata;
1472         int ret;
1473
1474         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1475         if (IS_ERR(opendata))
1476                 return PTR_ERR(opendata);
1477         ret = nfs4_open_recover(opendata, state);
1478         if (ret == -ESTALE)
1479                 d_drop(ctx->path.dentry);
1480         nfs4_opendata_put(opendata);
1481         return ret;
1482 }
1483
1484 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1485 {
1486         struct nfs_server *server = NFS_SERVER(state->inode);
1487         struct nfs4_exception exception = { };
1488         int err;
1489
1490         do {
1491                 err = _nfs4_open_expired(ctx, state);
1492                 switch (err) {
1493                 default:
1494                         goto out;
1495                 case -NFS4ERR_GRACE:
1496                 case -NFS4ERR_DELAY:
1497                         nfs4_handle_exception(server, err, &exception);
1498                         err = 0;
1499                 }
1500         } while (exception.retry);
1501 out:
1502         return err;
1503 }
1504
1505 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1506 {
1507         struct nfs_open_context *ctx;
1508         int ret;
1509
1510         ctx = nfs4_state_find_open_context(state);
1511         if (IS_ERR(ctx))
1512                 return PTR_ERR(ctx);
1513         ret = nfs4_do_open_expired(ctx, state);
1514         put_nfs_open_context(ctx);
1515         return ret;
1516 }
1517
1518 /*
1519  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1520  * fields corresponding to attributes that were used to store the verifier.
1521  * Make sure we clobber those fields in the later setattr call
1522  */
1523 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1524 {
1525         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1526             !(sattr->ia_valid & ATTR_ATIME_SET))
1527                 sattr->ia_valid |= ATTR_ATIME;
1528
1529         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1530             !(sattr->ia_valid & ATTR_MTIME_SET))
1531                 sattr->ia_valid |= ATTR_MTIME;
1532 }
1533
1534 /*
1535  * Returns a referenced nfs4_state
1536  */
1537 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)
1538 {
1539         struct nfs4_state_owner  *sp;
1540         struct nfs4_state     *state = NULL;
1541         struct nfs_server       *server = NFS_SERVER(dir);
1542         struct nfs4_opendata *opendata;
1543         int status;
1544
1545         /* Protect against reboot recovery conflicts */
1546         status = -ENOMEM;
1547         if (!(sp = nfs4_get_state_owner(server, cred))) {
1548                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1549                 goto out_err;
1550         }
1551         status = nfs4_recover_expired_lease(server);
1552         if (status != 0)
1553                 goto err_put_state_owner;
1554         if (path->dentry->d_inode != NULL)
1555                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1556         status = -ENOMEM;
1557         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1558         if (opendata == NULL)
1559                 goto err_put_state_owner;
1560
1561         if (path->dentry->d_inode != NULL)
1562                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1563
1564         status = _nfs4_proc_open(opendata);
1565         if (status != 0)
1566                 goto err_opendata_put;
1567
1568         if (opendata->o_arg.open_flags & O_EXCL)
1569                 nfs4_exclusive_attrset(opendata, sattr);
1570
1571         state = nfs4_opendata_to_nfs4_state(opendata);
1572         status = PTR_ERR(state);
1573         if (IS_ERR(state))
1574                 goto err_opendata_put;
1575         nfs4_opendata_put(opendata);
1576         nfs4_put_state_owner(sp);
1577         *res = state;
1578         return 0;
1579 err_opendata_put:
1580         nfs4_opendata_put(opendata);
1581 err_put_state_owner:
1582         nfs4_put_state_owner(sp);
1583 out_err:
1584         *res = NULL;
1585         return status;
1586 }
1587
1588
1589 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)
1590 {
1591         struct nfs4_exception exception = { };
1592         struct nfs4_state *res;
1593         int status;
1594
1595         do {
1596                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1597                 if (status == 0)
1598                         break;
1599                 /* NOTE: BAD_SEQID means the server and client disagree about the
1600                  * book-keeping w.r.t. state-changing operations
1601                  * (OPEN/CLOSE/LOCK/LOCKU...)
1602                  * It is actually a sign of a bug on the client or on the server.
1603                  *
1604                  * If we receive a BAD_SEQID error in the particular case of
1605                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1606                  * have unhashed the old state_owner for us, and that we can
1607                  * therefore safely retry using a new one. We should still warn
1608                  * the user though...
1609                  */
1610                 if (status == -NFS4ERR_BAD_SEQID) {
1611                         printk(KERN_WARNING "NFS: v4 server %s "
1612                                         " returned a bad sequence-id error!\n",
1613                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1614                         exception.retry = 1;
1615                         continue;
1616                 }
1617                 /*
1618                  * BAD_STATEID on OPEN means that the server cancelled our
1619                  * state before it received the OPEN_CONFIRM.
1620                  * Recover by retrying the request as per the discussion
1621                  * on Page 181 of RFC3530.
1622                  */
1623                 if (status == -NFS4ERR_BAD_STATEID) {
1624                         exception.retry = 1;
1625                         continue;
1626                 }
1627                 if (status == -EAGAIN) {
1628                         /* We must have found a delegation */
1629                         exception.retry = 1;
1630                         continue;
1631                 }
1632                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1633                                         status, &exception));
1634         } while (exception.retry);
1635         return res;
1636 }
1637
1638 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1639                             struct nfs_fattr *fattr, struct iattr *sattr,
1640                             struct nfs4_state *state)
1641 {
1642         struct nfs_server *server = NFS_SERVER(inode);
1643         struct nfs_setattrargs  arg = {
1644                 .fh             = NFS_FH(inode),
1645                 .iap            = sattr,
1646                 .server         = server,
1647                 .bitmask = server->attr_bitmask,
1648         };
1649         struct nfs_setattrres  res = {
1650                 .fattr          = fattr,
1651                 .server         = server,
1652         };
1653         struct rpc_message msg = {
1654                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1655                 .rpc_argp       = &arg,
1656                 .rpc_resp       = &res,
1657                 .rpc_cred       = cred,
1658         };
1659         unsigned long timestamp = jiffies;
1660         int status;
1661
1662         nfs_fattr_init(fattr);
1663
1664         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1665                 /* Use that stateid */
1666         } else if (state != NULL) {
1667                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1668         } else
1669                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1670
1671         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1672         if (status == 0 && state != NULL)
1673                 renew_lease(server, timestamp);
1674         return status;
1675 }
1676
1677 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1678                            struct nfs_fattr *fattr, struct iattr *sattr,
1679                            struct nfs4_state *state)
1680 {
1681         struct nfs_server *server = NFS_SERVER(inode);
1682         struct nfs4_exception exception = { };
1683         int err;
1684         do {
1685                 err = nfs4_handle_exception(server,
1686                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1687                                 &exception);
1688         } while (exception.retry);
1689         return err;
1690 }
1691
1692 struct nfs4_closedata {
1693         struct path path;
1694         struct inode *inode;
1695         struct nfs4_state *state;
1696         struct nfs_closeargs arg;
1697         struct nfs_closeres res;
1698         struct nfs_fattr fattr;
1699         unsigned long timestamp;
1700 };
1701
1702 static void nfs4_free_closedata(void *data)
1703 {
1704         struct nfs4_closedata *calldata = data;
1705         struct nfs4_state_owner *sp = calldata->state->owner;
1706
1707         nfs4_put_open_state(calldata->state);
1708         nfs_free_seqid(calldata->arg.seqid);
1709         nfs4_put_state_owner(sp);
1710         path_put(&calldata->path);
1711         kfree(calldata);
1712 }
1713
1714 static void nfs4_close_done(struct rpc_task *task, void *data)
1715 {
1716         struct nfs4_closedata *calldata = data;
1717         struct nfs4_state *state = calldata->state;
1718         struct nfs_server *server = NFS_SERVER(calldata->inode);
1719
1720         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1721         if (RPC_ASSASSINATED(task))
1722                 return;
1723         /* hmm. we are done with the inode, and in the process of freeing
1724          * the state_owner. we keep this around to process errors
1725          */
1726         switch (task->tk_status) {
1727                 case 0:
1728                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1729                         renew_lease(server, calldata->timestamp);
1730                         break;
1731                 case -NFS4ERR_STALE_STATEID:
1732                 case -NFS4ERR_OLD_STATEID:
1733                 case -NFS4ERR_BAD_STATEID:
1734                 case -NFS4ERR_EXPIRED:
1735                         if (calldata->arg.fmode == 0)
1736                                 break;
1737                 default:
1738                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1739                                 nfs_restart_rpc(task, server->nfs_client);
1740                                 return;
1741                         }
1742         }
1743         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1744 }
1745
1746 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1747 {
1748         struct nfs4_closedata *calldata = data;
1749         struct nfs4_state *state = calldata->state;
1750         int clear_rd, clear_wr, clear_rdwr;
1751
1752         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1753                 return;
1754
1755         clear_rd = clear_wr = clear_rdwr = 0;
1756         spin_lock(&state->owner->so_lock);
1757         /* Calculate the change in open mode */
1758         if (state->n_rdwr == 0) {
1759                 if (state->n_rdonly == 0) {
1760                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1761                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1762                 }
1763                 if (state->n_wronly == 0) {
1764                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1765                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1766                 }
1767         }
1768         spin_unlock(&state->owner->so_lock);
1769         if (!clear_rd && !clear_wr && !clear_rdwr) {
1770                 /* Note: exit _without_ calling nfs4_close_done */
1771                 task->tk_action = NULL;
1772                 return;
1773         }
1774         nfs_fattr_init(calldata->res.fattr);
1775         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1776                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1777                 calldata->arg.fmode = FMODE_READ;
1778         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1779                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1780                 calldata->arg.fmode = FMODE_WRITE;
1781         }
1782         calldata->timestamp = jiffies;
1783         if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1784                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1785                                 1, task))
1786                 return;
1787         rpc_call_start(task);
1788 }
1789
1790 static const struct rpc_call_ops nfs4_close_ops = {
1791         .rpc_call_prepare = nfs4_close_prepare,
1792         .rpc_call_done = nfs4_close_done,
1793         .rpc_release = nfs4_free_closedata,
1794 };
1795
1796 /*
1797  * It is possible for data to be read/written from a mem-mapped file
1798  * after the sys_close call (which hits the vfs layer as a flush).
1799  * This means that we can't safely call nfsv4 close on a file until
1800  * the inode is cleared. This in turn means that we are not good
1801  * NFSv4 citizens - we do not indicate to the server to update the file's
1802  * share state even when we are done with one of the three share
1803  * stateid's in the inode.
1804  *
1805  * NOTE: Caller must be holding the sp->so_owner semaphore!
1806  */
1807 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1808 {
1809         struct nfs_server *server = NFS_SERVER(state->inode);
1810         struct nfs4_closedata *calldata;
1811         struct nfs4_state_owner *sp = state->owner;
1812         struct rpc_task *task;
1813         struct rpc_message msg = {
1814                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1815                 .rpc_cred = state->owner->so_cred,
1816         };
1817         struct rpc_task_setup task_setup_data = {
1818                 .rpc_client = server->client,
1819                 .rpc_message = &msg,
1820                 .callback_ops = &nfs4_close_ops,
1821                 .workqueue = nfsiod_workqueue,
1822                 .flags = RPC_TASK_ASYNC,
1823         };
1824         int status = -ENOMEM;
1825
1826         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1827         if (calldata == NULL)
1828                 goto out;
1829         calldata->inode = state->inode;
1830         calldata->state = state;
1831         calldata->arg.fh = NFS_FH(state->inode);
1832         calldata->arg.stateid = &state->open_stateid;
1833         if (nfs4_has_session(server->nfs_client))
1834                 memset(calldata->arg.stateid->data, 0, 4);    /* clear seqid */
1835         /* Serialization for the sequence id */
1836         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1837         if (calldata->arg.seqid == NULL)
1838                 goto out_free_calldata;
1839         calldata->arg.fmode = 0;
1840         calldata->arg.bitmask = server->cache_consistency_bitmask;
1841         calldata->res.fattr = &calldata->fattr;
1842         calldata->res.seqid = calldata->arg.seqid;
1843         calldata->res.server = server;
1844         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1845         calldata->path.mnt = mntget(path->mnt);
1846         calldata->path.dentry = dget(path->dentry);
1847
1848         msg.rpc_argp = &calldata->arg,
1849         msg.rpc_resp = &calldata->res,
1850         task_setup_data.callback_data = calldata;
1851         task = rpc_run_task(&task_setup_data);
1852         if (IS_ERR(task))
1853                 return PTR_ERR(task);
1854         status = 0;
1855         if (wait)
1856                 status = rpc_wait_for_completion_task(task);
1857         rpc_put_task(task);
1858         return status;
1859 out_free_calldata:
1860         kfree(calldata);
1861 out:
1862         nfs4_put_open_state(state);
1863         nfs4_put_state_owner(sp);
1864         return status;
1865 }
1866
1867 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1868 {
1869         struct file *filp;
1870         int ret;
1871
1872         /* If the open_intent is for execute, we have an extra check to make */
1873         if (fmode & FMODE_EXEC) {
1874                 ret = nfs_may_open(state->inode,
1875                                 state->owner->so_cred,
1876                                 nd->intent.open.flags);
1877                 if (ret < 0)
1878                         goto out_close;
1879         }
1880         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1881         if (!IS_ERR(filp)) {
1882                 struct nfs_open_context *ctx;
1883                 ctx = nfs_file_open_context(filp);
1884                 ctx->state = state;
1885                 return 0;
1886         }
1887         ret = PTR_ERR(filp);
1888 out_close:
1889         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1890         return ret;
1891 }
1892
1893 struct dentry *
1894 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1895 {
1896         struct path path = {
1897                 .mnt = nd->path.mnt,
1898                 .dentry = dentry,
1899         };
1900         struct dentry *parent;
1901         struct iattr attr;
1902         struct rpc_cred *cred;
1903         struct nfs4_state *state;
1904         struct dentry *res;
1905         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1906
1907         if (nd->flags & LOOKUP_CREATE) {
1908                 attr.ia_mode = nd->intent.open.create_mode;
1909                 attr.ia_valid = ATTR_MODE;
1910                 if (!IS_POSIXACL(dir))
1911                         attr.ia_mode &= ~current_umask();
1912         } else {
1913                 attr.ia_valid = 0;
1914                 BUG_ON(nd->intent.open.flags & O_CREAT);
1915         }
1916
1917         cred = rpc_lookup_cred();
1918         if (IS_ERR(cred))
1919                 return (struct dentry *)cred;
1920         parent = dentry->d_parent;
1921         /* Protect against concurrent sillydeletes */
1922         nfs_block_sillyrename(parent);
1923         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1924         put_rpccred(cred);
1925         if (IS_ERR(state)) {
1926                 if (PTR_ERR(state) == -ENOENT) {
1927                         d_add(dentry, NULL);
1928                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1929                 }
1930                 nfs_unblock_sillyrename(parent);
1931                 return (struct dentry *)state;
1932         }
1933         res = d_add_unique(dentry, igrab(state->inode));
1934         if (res != NULL)
1935                 path.dentry = res;
1936         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1937         nfs_unblock_sillyrename(parent);
1938         nfs4_intent_set_file(nd, &path, state, fmode);
1939         return res;
1940 }
1941
1942 int
1943 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1944 {
1945         struct path path = {
1946                 .mnt = nd->path.mnt,
1947                 .dentry = dentry,
1948         };
1949         struct rpc_cred *cred;
1950         struct nfs4_state *state;
1951         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1952
1953         cred = rpc_lookup_cred();
1954         if (IS_ERR(cred))
1955                 return PTR_ERR(cred);
1956         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1957         put_rpccred(cred);
1958         if (IS_ERR(state)) {
1959                 switch (PTR_ERR(state)) {
1960                         case -EPERM:
1961                         case -EACCES:
1962                         case -EDQUOT:
1963                         case -ENOSPC:
1964                         case -EROFS:
1965                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1966                                 return 1;
1967                         default:
1968                                 goto out_drop;
1969                 }
1970         }
1971         if (state->inode == dentry->d_inode) {
1972                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1973                 nfs4_intent_set_file(nd, &path, state, fmode);
1974                 return 1;
1975         }
1976         nfs4_close_sync(&path, state, fmode);
1977 out_drop:
1978         d_drop(dentry);
1979         return 0;
1980 }
1981
1982 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1983 {
1984         if (ctx->state == NULL)
1985                 return;
1986         if (is_sync)
1987                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
1988         else
1989                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
1990 }
1991
1992 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1993 {
1994         struct nfs4_server_caps_arg args = {
1995                 .fhandle = fhandle,
1996         };
1997         struct nfs4_server_caps_res res = {};
1998         struct rpc_message msg = {
1999                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2000                 .rpc_argp = &args,
2001                 .rpc_resp = &res,
2002         };
2003         int status;
2004
2005         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2006         if (status == 0) {
2007                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2008                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2009                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2010                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2011                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2012                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2013                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2014                         server->caps |= NFS_CAP_ACLS;
2015                 if (res.has_links != 0)
2016                         server->caps |= NFS_CAP_HARDLINKS;
2017                 if (res.has_symlinks != 0)
2018                         server->caps |= NFS_CAP_SYMLINKS;
2019                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2020                         server->caps |= NFS_CAP_FILEID;
2021                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2022                         server->caps |= NFS_CAP_MODE;
2023                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2024                         server->caps |= NFS_CAP_NLINK;
2025                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2026                         server->caps |= NFS_CAP_OWNER;
2027                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2028                         server->caps |= NFS_CAP_OWNER_GROUP;
2029                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2030                         server->caps |= NFS_CAP_ATIME;
2031                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2032                         server->caps |= NFS_CAP_CTIME;
2033                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2034                         server->caps |= NFS_CAP_MTIME;
2035
2036                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2037                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2038                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2039                 server->acl_bitmask = res.acl_bitmask;
2040         }
2041
2042         return status;
2043 }
2044
2045 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2046 {
2047         struct nfs4_exception exception = { };
2048         int err;
2049         do {
2050                 err = nfs4_handle_exception(server,
2051                                 _nfs4_server_capabilities(server, fhandle),
2052                                 &exception);
2053         } while (exception.retry);
2054         return err;
2055 }
2056
2057 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2058                 struct nfs_fsinfo *info)
2059 {
2060         struct nfs4_lookup_root_arg args = {
2061                 .bitmask = nfs4_fattr_bitmap,
2062         };
2063         struct nfs4_lookup_res res = {
2064                 .server = server,
2065                 .fattr = info->fattr,
2066                 .fh = fhandle,
2067         };
2068         struct rpc_message msg = {
2069                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2070                 .rpc_argp = &args,
2071                 .rpc_resp = &res,
2072         };
2073
2074         nfs_fattr_init(info->fattr);
2075         return nfs4_call_sync(server, &msg, &args, &res, 0);
2076 }
2077
2078 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2079                 struct nfs_fsinfo *info)
2080 {
2081         struct nfs4_exception exception = { };
2082         int err;
2083         do {
2084                 err = nfs4_handle_exception(server,
2085                                 _nfs4_lookup_root(server, fhandle, info),
2086                                 &exception);
2087         } while (exception.retry);
2088         return err;
2089 }
2090
2091 /*
2092  * get the file handle for the "/" directory on the server
2093  */
2094 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2095                               struct nfs_fsinfo *info)
2096 {
2097         int status;
2098
2099         status = nfs4_lookup_root(server, fhandle, info);
2100         if (status == 0)
2101                 status = nfs4_server_capabilities(server, fhandle);
2102         if (status == 0)
2103                 status = nfs4_do_fsinfo(server, fhandle, info);
2104         return nfs4_map_errors(status);
2105 }
2106
2107 /*
2108  * Get locations and (maybe) other attributes of a referral.
2109  * Note that we'll actually follow the referral later when
2110  * we detect fsid mismatch in inode revalidation
2111  */
2112 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2113 {
2114         int status = -ENOMEM;
2115         struct page *page = NULL;
2116         struct nfs4_fs_locations *locations = NULL;
2117
2118         page = alloc_page(GFP_KERNEL);
2119         if (page == NULL)
2120                 goto out;
2121         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2122         if (locations == NULL)
2123                 goto out;
2124
2125         status = nfs4_proc_fs_locations(dir, name, locations, page);
2126         if (status != 0)
2127                 goto out;
2128         /* Make sure server returned a different fsid for the referral */
2129         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2130                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2131                 status = -EIO;
2132                 goto out;
2133         }
2134
2135         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2136         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2137         if (!fattr->mode)
2138                 fattr->mode = S_IFDIR;
2139         memset(fhandle, 0, sizeof(struct nfs_fh));
2140 out:
2141         if (page)
2142                 __free_page(page);
2143         if (locations)
2144                 kfree(locations);
2145         return status;
2146 }
2147
2148 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2149 {
2150         struct nfs4_getattr_arg args = {
2151                 .fh = fhandle,
2152                 .bitmask = server->attr_bitmask,
2153         };
2154         struct nfs4_getattr_res res = {
2155                 .fattr = fattr,
2156                 .server = server,
2157         };
2158         struct rpc_message msg = {
2159                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2160                 .rpc_argp = &args,
2161                 .rpc_resp = &res,
2162         };
2163
2164         nfs_fattr_init(fattr);
2165         return nfs4_call_sync(server, &msg, &args, &res, 0);
2166 }
2167
2168 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2169 {
2170         struct nfs4_exception exception = { };
2171         int err;
2172         do {
2173                 err = nfs4_handle_exception(server,
2174                                 _nfs4_proc_getattr(server, fhandle, fattr),
2175                                 &exception);
2176         } while (exception.retry);
2177         return err;
2178 }
2179
2180 /*
2181  * The file is not closed if it is opened due to the a request to change
2182  * the size of the file. The open call will not be needed once the
2183  * VFS layer lookup-intents are implemented.
2184  *
2185  * Close is called when the inode is destroyed.
2186  * If we haven't opened the file for O_WRONLY, we
2187  * need to in the size_change case to obtain a stateid.
2188  *
2189  * Got race?
2190  * Because OPEN is always done by name in nfsv4, it is
2191  * possible that we opened a different file by the same
2192  * name.  We can recognize this race condition, but we
2193  * can't do anything about it besides returning an error.
2194  *
2195  * This will be fixed with VFS changes (lookup-intent).
2196  */
2197 static int
2198 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2199                   struct iattr *sattr)
2200 {
2201         struct inode *inode = dentry->d_inode;
2202         struct rpc_cred *cred = NULL;
2203         struct nfs4_state *state = NULL;
2204         int status;
2205
2206         nfs_fattr_init(fattr);
2207
2208         /* Search for an existing open(O_WRITE) file */
2209         if (sattr->ia_valid & ATTR_FILE) {
2210                 struct nfs_open_context *ctx;
2211
2212                 ctx = nfs_file_open_context(sattr->ia_file);
2213                 if (ctx) {
2214                         cred = ctx->cred;
2215                         state = ctx->state;
2216                 }
2217         }
2218
2219         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2220         if (status == 0)
2221                 nfs_setattr_update_inode(inode, sattr);
2222         return status;
2223 }
2224
2225 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2226                 const struct qstr *name, struct nfs_fh *fhandle,
2227                 struct nfs_fattr *fattr)
2228 {
2229         int                    status;
2230         struct nfs4_lookup_arg args = {
2231                 .bitmask = server->attr_bitmask,
2232                 .dir_fh = dirfh,
2233                 .name = name,
2234         };
2235         struct nfs4_lookup_res res = {
2236                 .server = server,
2237                 .fattr = fattr,
2238                 .fh = fhandle,
2239         };
2240         struct rpc_message msg = {
2241                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2242                 .rpc_argp = &args,
2243                 .rpc_resp = &res,
2244         };
2245
2246         nfs_fattr_init(fattr);
2247
2248         dprintk("NFS call  lookupfh %s\n", name->name);
2249         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2250         dprintk("NFS reply lookupfh: %d\n", status);
2251         return status;
2252 }
2253
2254 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2255                               struct qstr *name, struct nfs_fh *fhandle,
2256                               struct nfs_fattr *fattr)
2257 {
2258         struct nfs4_exception exception = { };
2259         int err;
2260         do {
2261                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2262                 /* FIXME: !!!! */
2263                 if (err == -NFS4ERR_MOVED) {
2264                         err = -EREMOTE;
2265                         break;
2266                 }
2267                 err = nfs4_handle_exception(server, err, &exception);
2268         } while (exception.retry);
2269         return err;
2270 }
2271
2272 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2273                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2274 {
2275         int status;
2276
2277         dprintk("NFS call  lookup %s\n", name->name);
2278         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2279         if (status == -NFS4ERR_MOVED)
2280                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2281         dprintk("NFS reply lookup: %d\n", status);
2282         return status;
2283 }
2284
2285 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2286 {
2287         struct nfs4_exception exception = { };
2288         int err;
2289         do {
2290                 err = nfs4_handle_exception(NFS_SERVER(dir),
2291                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2292                                 &exception);
2293         } while (exception.retry);
2294         return err;
2295 }
2296
2297 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2298 {
2299         struct nfs_server *server = NFS_SERVER(inode);
2300         struct nfs_fattr fattr;
2301         struct nfs4_accessargs args = {
2302                 .fh = NFS_FH(inode),
2303                 .bitmask = server->attr_bitmask,
2304         };
2305         struct nfs4_accessres res = {
2306                 .server = server,
2307                 .fattr = &fattr,
2308         };
2309         struct rpc_message msg = {
2310                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2311                 .rpc_argp = &args,
2312                 .rpc_resp = &res,
2313                 .rpc_cred = entry->cred,
2314         };
2315         int mode = entry->mask;
2316         int status;
2317
2318         /*
2319          * Determine which access bits we want to ask for...
2320          */
2321         if (mode & MAY_READ)
2322                 args.access |= NFS4_ACCESS_READ;
2323         if (S_ISDIR(inode->i_mode)) {
2324                 if (mode & MAY_WRITE)
2325                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2326                 if (mode & MAY_EXEC)
2327                         args.access |= NFS4_ACCESS_LOOKUP;
2328         } else {
2329                 if (mode & MAY_WRITE)
2330                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2331                 if (mode & MAY_EXEC)
2332                         args.access |= NFS4_ACCESS_EXECUTE;
2333         }
2334         nfs_fattr_init(&fattr);
2335         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2336         if (!status) {
2337                 entry->mask = 0;
2338                 if (res.access & NFS4_ACCESS_READ)
2339                         entry->mask |= MAY_READ;
2340                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2341                         entry->mask |= MAY_WRITE;
2342                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2343                         entry->mask |= MAY_EXEC;
2344                 nfs_refresh_inode(inode, &fattr);
2345         }
2346         return status;
2347 }
2348
2349 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2350 {
2351         struct nfs4_exception exception = { };
2352         int err;
2353         do {
2354                 err = nfs4_handle_exception(NFS_SERVER(inode),
2355                                 _nfs4_proc_access(inode, entry),
2356                                 &exception);
2357         } while (exception.retry);
2358         return err;
2359 }
2360
2361 /*
2362  * TODO: For the time being, we don't try to get any attributes
2363  * along with any of the zero-copy operations READ, READDIR,
2364  * READLINK, WRITE.
2365  *
2366  * In the case of the first three, we want to put the GETATTR
2367  * after the read-type operation -- this is because it is hard
2368  * to predict the length of a GETATTR response in v4, and thus
2369  * align the READ data correctly.  This means that the GETATTR
2370  * may end up partially falling into the page cache, and we should
2371  * shift it into the 'tail' of the xdr_buf before processing.
2372  * To do this efficiently, we need to know the total length
2373  * of data received, which doesn't seem to be available outside
2374  * of the RPC layer.
2375  *
2376  * In the case of WRITE, we also want to put the GETATTR after
2377  * the operation -- in this case because we want to make sure
2378  * we get the post-operation mtime and size.  This means that
2379  * we can't use xdr_encode_pages() as written: we need a variant
2380  * of it which would leave room in the 'tail' iovec.
2381  *
2382  * Both of these changes to the XDR layer would in fact be quite
2383  * minor, but I decided to leave them for a subsequent patch.
2384  */
2385 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2386                 unsigned int pgbase, unsigned int pglen)
2387 {
2388         struct nfs4_readlink args = {
2389                 .fh       = NFS_FH(inode),
2390                 .pgbase   = pgbase,
2391                 .pglen    = pglen,
2392                 .pages    = &page,
2393         };
2394         struct nfs4_readlink_res res;
2395         struct rpc_message msg = {
2396                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2397                 .rpc_argp = &args,
2398                 .rpc_resp = &res,
2399         };
2400
2401         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2402 }
2403
2404 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2405                 unsigned int pgbase, unsigned int pglen)
2406 {
2407         struct nfs4_exception exception = { };
2408         int err;
2409         do {
2410                 err = nfs4_handle_exception(NFS_SERVER(inode),
2411                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2412                                 &exception);
2413         } while (exception.retry);
2414         return err;
2415 }
2416
2417 /*
2418  * Got race?
2419  * We will need to arrange for the VFS layer to provide an atomic open.
2420  * Until then, this create/open method is prone to inefficiency and race
2421  * conditions due to the lookup, create, and open VFS calls from sys_open()
2422  * placed on the wire.
2423  *
2424  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2425  * The file will be opened again in the subsequent VFS open call
2426  * (nfs4_proc_file_open).
2427  *
2428  * The open for read will just hang around to be used by any process that
2429  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2430  */
2431
2432 static int
2433 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2434                  int flags, struct nameidata *nd)
2435 {
2436         struct path path = {
2437                 .mnt = nd->path.mnt,
2438                 .dentry = dentry,
2439         };
2440         struct nfs4_state *state;
2441         struct rpc_cred *cred;
2442         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2443         int status = 0;
2444
2445         cred = rpc_lookup_cred();
2446         if (IS_ERR(cred)) {
2447                 status = PTR_ERR(cred);
2448                 goto out;
2449         }
2450         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2451         d_drop(dentry);
2452         if (IS_ERR(state)) {
2453                 status = PTR_ERR(state);
2454                 goto out_putcred;
2455         }
2456         d_add(dentry, igrab(state->inode));
2457         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2458         if (flags & O_EXCL) {
2459                 struct nfs_fattr fattr;
2460                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2461                 if (status == 0)
2462                         nfs_setattr_update_inode(state->inode, sattr);
2463                 nfs_post_op_update_inode(state->inode, &fattr);
2464         }
2465         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2466                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2467         else
2468                 nfs4_close_sync(&path, state, fmode);
2469 out_putcred:
2470         put_rpccred(cred);
2471 out:
2472         return status;
2473 }
2474
2475 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2476 {
2477         struct nfs_server *server = NFS_SERVER(dir);
2478         struct nfs_removeargs args = {
2479                 .fh = NFS_FH(dir),
2480                 .name.len = name->len,
2481                 .name.name = name->name,
2482                 .bitmask = server->attr_bitmask,
2483         };
2484         struct nfs_removeres res = {
2485                 .server = server,
2486         };
2487         struct rpc_message msg = {
2488                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2489                 .rpc_argp = &args,
2490                 .rpc_resp = &res,
2491         };
2492         int                     status;
2493
2494         nfs_fattr_init(&res.dir_attr);
2495         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2496         if (status == 0) {
2497                 update_changeattr(dir, &res.cinfo);
2498                 nfs_post_op_update_inode(dir, &res.dir_attr);
2499         }
2500         return status;
2501 }
2502
2503 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2504 {
2505         struct nfs4_exception exception = { };
2506         int err;
2507         do {
2508                 err = nfs4_handle_exception(NFS_SERVER(dir),
2509                                 _nfs4_proc_remove(dir, name),
2510                                 &exception);
2511         } while (exception.retry);
2512         return err;
2513 }
2514
2515 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2516 {
2517         struct nfs_server *server = NFS_SERVER(dir);
2518         struct nfs_removeargs *args = msg->rpc_argp;
2519         struct nfs_removeres *res = msg->rpc_resp;
2520
2521         args->bitmask = server->cache_consistency_bitmask;
2522         res->server = server;
2523         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2524 }
2525
2526 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2527 {
2528         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2529
2530         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2531         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2532                 return 0;
2533         update_changeattr(dir, &res->cinfo);
2534         nfs_post_op_update_inode(dir, &res->dir_attr);
2535         return 1;
2536 }
2537
2538 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2539                 struct inode *new_dir, struct qstr *new_name)
2540 {
2541         struct nfs_server *server = NFS_SERVER(old_dir);
2542         struct nfs4_rename_arg arg = {
2543                 .old_dir = NFS_FH(old_dir),
2544                 .new_dir = NFS_FH(new_dir),
2545                 .old_name = old_name,
2546                 .new_name = new_name,
2547                 .bitmask = server->attr_bitmask,
2548         };
2549         struct nfs_fattr old_fattr, new_fattr;
2550         struct nfs4_rename_res res = {
2551                 .server = server,
2552                 .old_fattr = &old_fattr,
2553                 .new_fattr = &new_fattr,
2554         };
2555         struct rpc_message msg = {
2556                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2557                 .rpc_argp = &arg,
2558                 .rpc_resp = &res,
2559         };
2560         int                     status;
2561
2562         nfs_fattr_init(res.old_fattr);
2563         nfs_fattr_init(res.new_fattr);
2564         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2565
2566         if (!status) {
2567                 update_changeattr(old_dir, &res.old_cinfo);
2568                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2569                 update_changeattr(new_dir, &res.new_cinfo);
2570                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2571         }
2572         return status;
2573 }
2574
2575 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2576                 struct inode *new_dir, struct qstr *new_name)
2577 {
2578         struct nfs4_exception exception = { };
2579         int err;
2580         do {
2581                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2582                                 _nfs4_proc_rename(old_dir, old_name,
2583                                         new_dir, new_name),
2584                                 &exception);
2585         } while (exception.retry);
2586         return err;
2587 }
2588
2589 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2590 {
2591         struct nfs_server *server = NFS_SERVER(inode);
2592         struct nfs4_link_arg arg = {
2593                 .fh     = NFS_FH(inode),
2594                 .dir_fh = NFS_FH(dir),
2595                 .name   = name,
2596                 .bitmask = server->attr_bitmask,
2597         };
2598         struct nfs_fattr fattr, dir_attr;
2599         struct nfs4_link_res res = {
2600                 .server = server,
2601                 .fattr = &fattr,
2602                 .dir_attr = &dir_attr,
2603         };
2604         struct rpc_message msg = {
2605                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2606                 .rpc_argp = &arg,
2607                 .rpc_resp = &res,
2608         };
2609         int                     status;
2610
2611         nfs_fattr_init(res.fattr);
2612         nfs_fattr_init(res.dir_attr);
2613         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2614         if (!status) {
2615                 update_changeattr(dir, &res.cinfo);
2616                 nfs_post_op_update_inode(dir, res.dir_attr);
2617                 nfs_post_op_update_inode(inode, res.fattr);
2618         }
2619
2620         return status;
2621 }
2622
2623 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2624 {
2625         struct nfs4_exception exception = { };
2626         int err;
2627         do {
2628                 err = nfs4_handle_exception(NFS_SERVER(inode),
2629                                 _nfs4_proc_link(inode, dir, name),
2630                                 &exception);
2631         } while (exception.retry);
2632         return err;
2633 }
2634
2635 struct nfs4_createdata {
2636         struct rpc_message msg;
2637         struct nfs4_create_arg arg;
2638         struct nfs4_create_res res;
2639         struct nfs_fh fh;
2640         struct nfs_fattr fattr;
2641         struct nfs_fattr dir_fattr;
2642 };
2643
2644 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2645                 struct qstr *name, struct iattr *sattr, u32 ftype)
2646 {
2647         struct nfs4_createdata *data;
2648
2649         data = kzalloc(sizeof(*data), GFP_KERNEL);
2650         if (data != NULL) {
2651                 struct nfs_server *server = NFS_SERVER(dir);
2652
2653                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2654                 data->msg.rpc_argp = &data->arg;
2655                 data->msg.rpc_resp = &data->res;
2656                 data->arg.dir_fh = NFS_FH(dir);
2657                 data->arg.server = server;
2658                 data->arg.name = name;
2659                 data->arg.attrs = sattr;
2660                 data->arg.ftype = ftype;
2661                 data->arg.bitmask = server->attr_bitmask;
2662                 data->res.server = server;
2663                 data->res.fh = &data->fh;
2664                 data->res.fattr = &data->fattr;
2665                 data->res.dir_fattr = &data->dir_fattr;
2666                 nfs_fattr_init(data->res.fattr);
2667                 nfs_fattr_init(data->res.dir_fattr);
2668         }
2669         return data;
2670 }
2671
2672 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2673 {
2674         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2675                                     &data->arg, &data->res, 1);
2676         if (status == 0) {
2677                 update_changeattr(dir, &data->res.dir_cinfo);
2678                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2679                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2680         }
2681         return status;
2682 }
2683
2684 static void nfs4_free_createdata(struct nfs4_createdata *data)
2685 {
2686         kfree(data);
2687 }
2688
2689 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2690                 struct page *page, unsigned int len, struct iattr *sattr)
2691 {
2692         struct nfs4_createdata *data;
2693         int status = -ENAMETOOLONG;
2694
2695         if (len > NFS4_MAXPATHLEN)
2696                 goto out;
2697
2698         status = -ENOMEM;
2699         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2700         if (data == NULL)
2701                 goto out;
2702
2703         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2704         data->arg.u.symlink.pages = &page;
2705         data->arg.u.symlink.len = len;
2706
2707         status = nfs4_do_create(dir, dentry, data);
2708
2709         nfs4_free_createdata(data);
2710 out:
2711         return status;
2712 }
2713
2714 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2715                 struct page *page, unsigned int len, struct iattr *sattr)
2716 {
2717         struct nfs4_exception exception = { };
2718         int err;
2719         do {
2720                 err = nfs4_handle_exception(NFS_SERVER(dir),
2721                                 _nfs4_proc_symlink(dir, dentry, page,
2722                                                         len, sattr),
2723                                 &exception);
2724         } while (exception.retry);
2725         return err;
2726 }
2727
2728 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2729                 struct iattr *sattr)
2730 {
2731         struct nfs4_createdata *data;
2732         int status = -ENOMEM;
2733
2734         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2735         if (data == NULL)
2736                 goto out;
2737
2738         status = nfs4_do_create(dir, dentry, data);
2739
2740         nfs4_free_createdata(data);
2741 out:
2742         return status;
2743 }
2744
2745 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2746                 struct iattr *sattr)
2747 {
2748         struct nfs4_exception exception = { };
2749         int err;
2750         do {
2751                 err = nfs4_handle_exception(NFS_SERVER(dir),
2752                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2753                                 &exception);
2754         } while (exception.retry);
2755         return err;
2756 }
2757
2758 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2759                   u64 cookie, struct page *page, unsigned int count, int plus)
2760 {
2761         struct inode            *dir = dentry->d_inode;
2762         struct nfs4_readdir_arg args = {
2763                 .fh = NFS_FH(dir),
2764                 .pages = &page,
2765                 .pgbase = 0,
2766                 .count = count,
2767                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2768         };
2769         struct nfs4_readdir_res res;
2770         struct rpc_message msg = {
2771                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2772                 .rpc_argp = &args,
2773                 .rpc_resp = &res,
2774                 .rpc_cred = cred,
2775         };
2776         int                     status;
2777
2778         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2779                         dentry->d_parent->d_name.name,
2780                         dentry->d_name.name,
2781                         (unsigned long long)cookie);
2782         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2783         res.pgbase = args.pgbase;
2784         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2785         if (status == 0)
2786                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2787
2788         nfs_invalidate_atime(dir);
2789
2790         dprintk("%s: returns %d\n", __func__, status);
2791         return status;
2792 }
2793
2794 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2795                   u64 cookie, struct page *page, unsigned int count, int plus)
2796 {
2797         struct nfs4_exception exception = { };
2798         int err;
2799         do {
2800                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2801                                 _nfs4_proc_readdir(dentry, cred, cookie,
2802                                         page, count, plus),
2803                                 &exception);
2804         } while (exception.retry);
2805         return err;
2806 }
2807
2808 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2809                 struct iattr *sattr, dev_t rdev)
2810 {
2811         struct nfs4_createdata *data;
2812         int mode = sattr->ia_mode;
2813         int status = -ENOMEM;
2814
2815         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2816         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2817
2818         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2819         if (data == NULL)
2820                 goto out;
2821
2822         if (S_ISFIFO(mode))
2823                 data->arg.ftype = NF4FIFO;
2824         else if (S_ISBLK(mode)) {
2825                 data->arg.ftype = NF4BLK;
2826                 data->arg.u.device.specdata1 = MAJOR(rdev);
2827                 data->arg.u.device.specdata2 = MINOR(rdev);
2828         }
2829         else if (S_ISCHR(mode)) {
2830                 data->arg.ftype = NF4CHR;
2831                 data->arg.u.device.specdata1 = MAJOR(rdev);
2832                 data->arg.u.device.specdata2 = MINOR(rdev);
2833         }
2834
2835         status = nfs4_do_create(dir, dentry, data);
2836
2837         nfs4_free_createdata(data);
2838 out:
2839         return status;
2840 }
2841
2842 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2843                 struct iattr *sattr, dev_t rdev)
2844 {
2845         struct nfs4_exception exception = { };
2846         int err;
2847         do {
2848                 err = nfs4_handle_exception(NFS_SERVER(dir),
2849                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2850                                 &exception);
2851         } while (exception.retry);
2852         return err;
2853 }
2854
2855 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2856                  struct nfs_fsstat *fsstat)
2857 {
2858         struct nfs4_statfs_arg args = {
2859                 .fh = fhandle,
2860                 .bitmask = server->attr_bitmask,
2861         };
2862         struct nfs4_statfs_res res = {
2863                 .fsstat = fsstat,
2864         };
2865         struct rpc_message msg = {
2866                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2867                 .rpc_argp = &args,
2868                 .rpc_resp = &res,
2869         };
2870
2871         nfs_fattr_init(fsstat->fattr);
2872         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2873 }
2874
2875 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2876 {
2877         struct nfs4_exception exception = { };
2878         int err;
2879         do {
2880                 err = nfs4_handle_exception(server,
2881                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2882                                 &exception);
2883         } while (exception.retry);
2884         return err;
2885 }
2886
2887 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2888                 struct nfs_fsinfo *fsinfo)
2889 {
2890         struct nfs4_fsinfo_arg args = {
2891                 .fh = fhandle,
2892                 .bitmask = server->attr_bitmask,
2893         };
2894         struct nfs4_fsinfo_res res = {
2895                 .fsinfo = fsinfo,
2896         };
2897         struct rpc_message msg = {
2898                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2899                 .rpc_argp = &args,
2900                 .rpc_resp = &res,
2901         };
2902
2903         return nfs4_call_sync(server, &msg, &args, &res, 0);
2904 }
2905
2906 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2907 {
2908         struct nfs4_exception exception = { };
2909         int err;
2910
2911         do {
2912                 err = nfs4_handle_exception(server,
2913                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2914                                 &exception);
2915         } while (exception.retry);
2916         return err;
2917 }
2918
2919 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2920 {
2921         nfs_fattr_init(fsinfo->fattr);
2922         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2923 }
2924
2925 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2926                 struct nfs_pathconf *pathconf)
2927 {
2928         struct nfs4_pathconf_arg args = {
2929                 .fh = fhandle,
2930                 .bitmask = server->attr_bitmask,
2931         };
2932         struct nfs4_pathconf_res res = {
2933                 .pathconf = pathconf,
2934         };
2935         struct rpc_message msg = {
2936                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2937                 .rpc_argp = &args,
2938                 .rpc_resp = &res,
2939         };
2940
2941         /* None of the pathconf attributes are mandatory to implement */
2942         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2943                 memset(pathconf, 0, sizeof(*pathconf));
2944                 return 0;
2945         }
2946
2947         nfs_fattr_init(pathconf->fattr);
2948         return nfs4_call_sync(server, &msg, &args, &res, 0);
2949 }
2950
2951 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2952                 struct nfs_pathconf *pathconf)
2953 {
2954         struct nfs4_exception exception = { };
2955         int err;
2956
2957         do {
2958                 err = nfs4_handle_exception(server,
2959                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2960                                 &exception);
2961         } while (exception.retry);
2962         return err;
2963 }
2964
2965 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2966 {
2967         struct nfs_server *server = NFS_SERVER(data->inode);
2968
2969         dprintk("--> %s\n", __func__);
2970
2971         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
2972
2973         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2974                 nfs_restart_rpc(task, server->nfs_client);
2975                 return -EAGAIN;
2976         }
2977
2978         nfs_invalidate_atime(data->inode);
2979         if (task->tk_status > 0)
2980                 renew_lease(server, data->timestamp);
2981         return 0;
2982 }
2983
2984 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2985 {
2986         data->timestamp   = jiffies;
2987         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2988 }
2989
2990 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2991 {
2992         struct inode *inode = data->inode;
2993
2994         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
2995                            task->tk_status);
2996
2997         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
2998                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
2999                 return -EAGAIN;
3000         }
3001         if (task->tk_status >= 0) {
3002                 renew_lease(NFS_SERVER(inode), data->timestamp);
3003                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3004         }
3005         return 0;
3006 }
3007
3008 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3009 {
3010         struct nfs_server *server = NFS_SERVER(data->inode);
3011
3012         data->args.bitmask = server->cache_consistency_bitmask;
3013         data->res.server = server;
3014         data->timestamp   = jiffies;
3015
3016         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3017 }
3018
3019 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3020 {
3021         struct inode *inode = data->inode;
3022
3023         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3024                            task->tk_status);
3025         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3026                 nfs_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3027                 return -EAGAIN;
3028         }
3029         nfs_refresh_inode(inode, data->res.fattr);
3030         return 0;
3031 }
3032
3033 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3034 {
3035         struct nfs_server *server = NFS_SERVER(data->inode);
3036
3037         data->args.bitmask = server->cache_consistency_bitmask;
3038         data->res.server = server;
3039         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3040 }
3041
3042 /*
3043  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3044  * standalone procedure for queueing an asynchronous RENEW.
3045  */
3046 static void nfs4_renew_done(struct rpc_task *task, void *data)
3047 {
3048         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
3049         unsigned long timestamp = (unsigned long)data;
3050
3051         if (task->tk_status < 0) {
3052                 /* Unless we're shutting down, schedule state recovery! */
3053                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3054                         nfs4_schedule_state_recovery(clp);
3055                 return;
3056         }
3057         spin_lock(&clp->cl_lock);
3058         if (time_before(clp->cl_last_renewal,timestamp))
3059                 clp->cl_last_renewal = timestamp;
3060         spin_unlock(&clp->cl_lock);
3061 }
3062
3063 static const struct rpc_call_ops nfs4_renew_ops = {
3064         .rpc_call_done = nfs4_renew_done,
3065 };
3066
3067 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3068 {
3069         struct rpc_message msg = {
3070                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3071                 .rpc_argp       = clp,
3072                 .rpc_cred       = cred,
3073         };
3074
3075         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3076                         &nfs4_renew_ops, (void *)jiffies);
3077 }
3078
3079 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3080 {
3081         struct rpc_message msg = {
3082                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3083                 .rpc_argp       = clp,
3084                 .rpc_cred       = cred,
3085         };
3086         unsigned long now = jiffies;
3087         int status;
3088
3089         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3090         if (status < 0)
3091                 return status;
3092         spin_lock(&clp->cl_lock);
3093         if (time_before(clp->cl_last_renewal,now))
3094                 clp->cl_last_renewal = now;
3095         spin_unlock(&clp->cl_lock);
3096         return 0;
3097 }
3098
3099 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3100 {
3101         return (server->caps & NFS_CAP_ACLS)
3102                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3103                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3104 }
3105
3106 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3107  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3108  * the stack.
3109  */
3110 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3111
3112 static void buf_to_pages(const void *buf, size_t buflen,
3113                 struct page **pages, unsigned int *pgbase)
3114 {
3115         const void *p = buf;
3116
3117         *pgbase = offset_in_page(buf);
3118         p -= *pgbase;
3119         while (p < buf + buflen) {
3120                 *(pages++) = virt_to_page(p);
3121                 p += PAGE_CACHE_SIZE;
3122         }
3123 }
3124
3125 struct nfs4_cached_acl {
3126         int cached;
3127         size_t len;
3128         char data[0];
3129 };
3130
3131 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3132 {
3133         struct nfs_inode *nfsi = NFS_I(inode);
3134
3135         spin_lock(&inode->i_lock);
3136         kfree(nfsi->nfs4_acl);
3137         nfsi->nfs4_acl = acl;
3138         spin_unlock(&inode->i_lock);
3139 }
3140
3141 static void nfs4_zap_acl_attr(struct inode *inode)
3142 {
3143         nfs4_set_cached_acl(inode, NULL);
3144 }
3145
3146 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3147 {
3148         struct nfs_inode *nfsi = NFS_I(inode);
3149         struct nfs4_cached_acl *acl;
3150         int ret = -ENOENT;
3151
3152         spin_lock(&inode->i_lock);
3153         acl = nfsi->nfs4_acl;
3154         if (acl == NULL)
3155                 goto out;
3156         if (buf == NULL) /* user is just asking for length */
3157                 goto out_len;
3158         if (acl->cached == 0)
3159                 goto out;
3160         ret = -ERANGE; /* see getxattr(2) man page */
3161         if (acl->len > buflen)
3162                 goto out;
3163         memcpy(buf, acl->data, acl->len);
3164 out_len:
3165         ret = acl->len;
3166 out:
3167         spin_unlock(&inode->i_lock);
3168         return ret;
3169 }
3170
3171 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3172 {
3173         struct nfs4_cached_acl *acl;
3174
3175         if (buf && acl_len <= PAGE_SIZE) {
3176                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3177                 if (acl == NULL)
3178                         goto out;
3179                 acl->cached = 1;
3180                 memcpy(acl->data, buf, acl_len);
3181         } else {
3182                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3183                 if (acl == NULL)
3184                         goto out;
3185                 acl->cached = 0;
3186         }
3187         acl->len = acl_len;
3188 out:
3189         nfs4_set_cached_acl(inode, acl);
3190 }
3191
3192 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3193 {
3194         struct page *pages[NFS4ACL_MAXPAGES];
3195         struct nfs_getaclargs args = {
3196                 .fh = NFS_FH(inode),
3197                 .acl_pages = pages,
3198                 .acl_len = buflen,
3199         };
3200         struct nfs_getaclres res = {
3201                 .acl_len = buflen,
3202         };
3203         void *resp_buf;
3204         struct rpc_message msg = {
3205                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3206                 .rpc_argp = &args,
3207                 .rpc_resp = &res,
3208         };
3209         struct page *localpage = NULL;
3210         int ret;
3211
3212         if (buflen < PAGE_SIZE) {
3213                 /* As long as we're doing a round trip to the server anyway,
3214                  * let's be prepared for a page of acl data. */
3215                 localpage = alloc_page(GFP_KERNEL);
3216                 resp_buf = page_address(localpage);
3217                 if (localpage == NULL)
3218                         return -ENOMEM;
3219                 args.acl_pages[0] = localpage;
3220                 args.acl_pgbase = 0;
3221                 args.acl_len = PAGE_SIZE;
3222         } else {
3223                 resp_buf = buf;
3224                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3225         }
3226         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3227         if (ret)
3228                 goto out_free;
3229         if (res.acl_len > args.acl_len)
3230                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3231         else
3232                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3233         if (buf) {
3234                 ret = -ERANGE;
3235                 if (res.acl_len > buflen)
3236                         goto out_free;
3237                 if (localpage)
3238                         memcpy(buf, resp_buf, res.acl_len);
3239         }
3240         ret = res.acl_len;
3241 out_free:
3242         if (localpage)
3243                 __free_page(localpage);
3244         return ret;
3245 }
3246
3247 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3248 {
3249         struct nfs4_exception exception = { };
3250         ssize_t ret;
3251         do {
3252                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3253                 if (ret >= 0)
3254                         break;
3255                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3256         } while (exception.retry);
3257         return ret;
3258 }
3259
3260 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3261 {
3262         struct nfs_server *server = NFS_SERVER(inode);
3263         int ret;
3264
3265         if (!nfs4_server_supports_acls(server))
3266                 return -EOPNOTSUPP;
3267         ret = nfs_revalidate_inode(server, inode);
3268         if (ret < 0)
3269                 return ret;
3270         ret = nfs4_read_cached_acl(inode, buf, buflen);
3271         if (ret != -ENOENT)
3272                 return ret;
3273         return nfs4_get_acl_uncached(inode, buf, buflen);
3274 }
3275
3276 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3277 {
3278         struct nfs_server *server = NFS_SERVER(inode);
3279         struct page *pages[NFS4ACL_MAXPAGES];
3280         struct nfs_setaclargs arg = {
3281                 .fh             = NFS_FH(inode),
3282                 .acl_pages      = pages,
3283                 .acl_len        = buflen,
3284         };
3285         struct nfs_setaclres res;
3286         struct rpc_message msg = {
3287                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3288                 .rpc_argp       = &arg,
3289                 .rpc_resp       = &res,
3290         };
3291         int ret;
3292
3293         if (!nfs4_server_supports_acls(server))
3294                 return -EOPNOTSUPP;
3295         nfs_inode_return_delegation(inode);
3296         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3297         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3298         nfs_access_zap_cache(inode);
3299         nfs_zap_acl_cache(inode);
3300         return ret;
3301 }
3302
3303 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3304 {
3305         struct nfs4_exception exception = { };
3306         int err;
3307         do {
3308                 err = nfs4_handle_exception(NFS_SERVER(inode),
3309                                 __nfs4_proc_set_acl(inode, buf, buflen),
3310                                 &exception);
3311         } while (exception.retry);
3312         return err;
3313 }
3314
3315 static int
3316 _nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs_client *clp, struct nfs4_state *state)
3317 {
3318         if (!clp || task->tk_status >= 0)
3319                 return 0;
3320         switch(task->tk_status) {
3321                 case -NFS4ERR_ADMIN_REVOKED:
3322                 case -NFS4ERR_BAD_STATEID:
3323                 case -NFS4ERR_OPENMODE:
3324                         if (state == NULL)
3325                                 break;
3326                         nfs4_state_mark_reclaim_nograce(clp, state);
3327                 case -NFS4ERR_STALE_CLIENTID:
3328                 case -NFS4ERR_STALE_STATEID:
3329                 case -NFS4ERR_EXPIRED:
3330                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3331                         nfs4_schedule_state_recovery(clp);
3332                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3333                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3334                         task->tk_status = 0;
3335                         return -EAGAIN;
3336 #if defined(CONFIG_NFS_V4_1)
3337                 case -NFS4ERR_BADSESSION:
3338                 case -NFS4ERR_BADSLOT:
3339                 case -NFS4ERR_BAD_HIGH_SLOT:
3340                 case -NFS4ERR_DEADSESSION:
3341                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3342                 case -NFS4ERR_SEQ_FALSE_RETRY:
3343                 case -NFS4ERR_SEQ_MISORDERED:
3344                         dprintk("%s ERROR %d, Reset session\n", __func__,
3345                                 task->tk_status);
3346                         nfs4_schedule_state_recovery(clp);
3347                         task->tk_status = 0;
3348                         return -EAGAIN;
3349 #endif /* CONFIG_NFS_V4_1 */
3350                 case -NFS4ERR_DELAY:
3351                         if (server)
3352                                 nfs_inc_server_stats(server, NFSIOS_DELAY);
3353                 case -NFS4ERR_GRACE:
3354                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3355                         task->tk_status = 0;
3356                         return -EAGAIN;
3357                 case -NFS4ERR_OLD_STATEID:
3358                         task->tk_status = 0;
3359                         return -EAGAIN;
3360         }
3361         task->tk_status = nfs4_map_errors(task->tk_status);
3362         return 0;
3363 }
3364
3365 static int
3366 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3367 {
3368         return _nfs4_async_handle_error(task, server, server->nfs_client, state);
3369 }
3370
3371 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3372 {
3373         nfs4_verifier sc_verifier;
3374         struct nfs4_setclientid setclientid = {
3375                 .sc_verifier = &sc_verifier,
3376                 .sc_prog = program,
3377         };
3378         struct rpc_message msg = {
3379                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3380                 .rpc_argp = &setclientid,
3381                 .rpc_resp = clp,
3382                 .rpc_cred = cred,
3383         };
3384         __be32 *p;
3385         int loop = 0;
3386         int status;
3387
3388         p = (__be32*)sc_verifier.data;
3389         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3390         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3391
3392         for(;;) {
3393                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3394                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3395                                 clp->cl_ipaddr,
3396                                 rpc_peeraddr2str(clp->cl_rpcclient,
3397                                                         RPC_DISPLAY_ADDR),
3398                                 rpc_peeraddr2str(clp->cl_rpcclient,
3399                                                         RPC_DISPLAY_PROTO),
3400                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3401                                 clp->cl_id_uniquifier);
3402                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3403                                 sizeof(setclientid.sc_netid),
3404                                 rpc_peeraddr2str(clp->cl_rpcclient,
3405                                                         RPC_DISPLAY_NETID));
3406                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3407                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3408                                 clp->cl_ipaddr, port >> 8, port & 255);
3409
3410                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3411                 if (status != -NFS4ERR_CLID_INUSE)
3412                         break;
3413                 if (signalled())
3414                         break;
3415                 if (loop++ & 1)
3416                         ssleep(clp->cl_lease_time + 1);
3417                 else
3418                         if (++clp->cl_id_uniquifier == 0)
3419                                 break;
3420         }
3421         return status;
3422 }
3423
3424 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3425 {
3426         struct nfs_fsinfo fsinfo;
3427         struct rpc_message msg = {
3428                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3429                 .rpc_argp = clp,
3430                 .rpc_resp = &fsinfo,
3431                 .rpc_cred = cred,
3432         };
3433         unsigned long now;
3434         int status;
3435
3436         now = jiffies;
3437         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3438         if (status == 0) {
3439                 spin_lock(&clp->cl_lock);
3440                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3441                 clp->cl_last_renewal = now;
3442                 spin_unlock(&clp->cl_lock);
3443         }
3444         return status;
3445 }
3446
3447 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3448 {
3449         long timeout = 0;
3450         int err;
3451         do {
3452                 err = _nfs4_proc_setclientid_confirm(clp, cred);
3453                 switch (err) {
3454                         case 0:
3455                                 return err;
3456                         case -NFS4ERR_RESOURCE:
3457                                 /* The IBM lawyers misread another document! */
3458                         case -NFS4ERR_DELAY:
3459                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3460                 }
3461         } while (err == 0);
3462         return err;
3463 }
3464
3465 struct nfs4_delegreturndata {
3466         struct nfs4_delegreturnargs args;
3467         struct nfs4_delegreturnres res;
3468         struct nfs_fh fh;
3469         nfs4_stateid stateid;
3470         unsigned long timestamp;
3471         struct nfs_fattr fattr;
3472         int rpc_status;
3473 };
3474
3475 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3476 {
3477         struct nfs4_delegreturndata *data = calldata;
3478
3479         nfs4_sequence_done(data->res.server, &data->res.seq_res,
3480                         task->tk_status);
3481
3482         switch (task->tk_status) {
3483         case -NFS4ERR_STALE_STATEID:
3484         case -NFS4ERR_EXPIRED:
3485         case 0:
3486                 renew_lease(data->res.server, data->timestamp);
3487                 break;
3488         default:
3489                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
3490                                 -EAGAIN) {
3491                         nfs_restart_rpc(task, data->res.server->nfs_client);
3492                         return;
3493                 }
3494         }
3495         data->rpc_status = task->tk_status;
3496 }
3497
3498 static void nfs4_delegreturn_release(void *calldata)
3499 {
3500         kfree(calldata);
3501 }
3502
3503 #if defined(CONFIG_NFS_V4_1)
3504 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3505 {
3506         struct nfs4_delegreturndata *d_data;
3507
3508         d_data = (struct nfs4_delegreturndata *)data;
3509
3510         if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3511                                 &d_data->args.seq_args,
3512                                 &d_data->res.seq_res, 1, task))
3513                 return;
3514         rpc_call_start(task);
3515 }
3516 #endif /* CONFIG_NFS_V4_1 */
3517
3518 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3519 #if defined(CONFIG_NFS_V4_1)
3520         .rpc_call_prepare = nfs4_delegreturn_prepare,
3521 #endif /* CONFIG_NFS_V4_1 */
3522         .rpc_call_done = nfs4_delegreturn_done,
3523         .rpc_release = nfs4_delegreturn_release,
3524 };
3525
3526 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3527 {
3528         struct nfs4_delegreturndata *data;
3529         struct nfs_server *server = NFS_SERVER(inode);
3530         struct rpc_task *task;
3531         struct rpc_message msg = {
3532                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3533                 .rpc_cred = cred,
3534         };
3535         struct rpc_task_setup task_setup_data = {
3536                 .rpc_client = server->client,
3537                 .rpc_message = &msg,
3538                 .callback_ops = &nfs4_delegreturn_ops,
3539                 .flags = RPC_TASK_ASYNC,
3540         };
3541         int status = 0;
3542
3543         data = kzalloc(sizeof(*data), GFP_KERNEL);
3544         if (data == NULL)
3545                 return -ENOMEM;
3546         data->args.fhandle = &data->fh;
3547         data->args.stateid = &data->stateid;
3548         data->args.bitmask = server->attr_bitmask;
3549         nfs_copy_fh(&data->fh, NFS_FH(inode));
3550         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3551         data->res.fattr = &data->fattr;
3552         data->res.server = server;
3553         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3554         nfs_fattr_init(data->res.fattr);
3555         data->timestamp = jiffies;
3556         data->rpc_status = 0;
3557
3558         task_setup_data.callback_data = data;
3559         msg.rpc_argp = &data->args,
3560         msg.rpc_resp = &data->res,
3561         task = rpc_run_task(&task_setup_data);
3562         if (IS_ERR(task))
3563                 return PTR_ERR(task);
3564         if (!issync)
3565                 goto out;
3566         status = nfs4_wait_for_completion_rpc_task(task);
3567         if (status != 0)
3568                 goto out;
3569         status = data->rpc_status;
3570         if (status != 0)
3571                 goto out;
3572         nfs_refresh_inode(inode, &data->fattr);
3573 out:
3574         rpc_put_task(task);
3575         return status;
3576 }
3577
3578 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3579 {
3580         struct nfs_server *server = NFS_SERVER(inode);
3581         struct nfs4_exception exception = { };
3582         int err;
3583         do {
3584                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3585                 switch (err) {
3586                         case -NFS4ERR_STALE_STATEID:
3587                         case -NFS4ERR_EXPIRED:
3588                         case 0:
3589                                 return 0;
3590                 }
3591                 err = nfs4_handle_exception(server, err, &exception);
3592         } while (exception.retry);
3593         return err;
3594 }
3595
3596 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3597 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3598
3599 /*
3600  * sleep, with exponential backoff, and retry the LOCK operation.
3601  */
3602 static unsigned long
3603 nfs4_set_lock_task_retry(unsigned long timeout)
3604 {
3605         schedule_timeout_killable(timeout);
3606         timeout <<= 1;
3607         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3608                 return NFS4_LOCK_MAXTIMEOUT;
3609         return timeout;
3610 }
3611
3612 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3613 {
3614         struct inode *inode = state->inode;
3615         struct nfs_server *server = NFS_SERVER(inode);
3616         struct nfs_client *clp = server->nfs_client;
3617         struct nfs_lockt_args arg = {
3618                 .fh = NFS_FH(inode),
3619                 .fl = request,
3620         };
3621         struct nfs_lockt_res res = {
3622                 .denied = request,
3623         };
3624         struct rpc_message msg = {
3625                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3626                 .rpc_argp       = &arg,
3627                 .rpc_resp       = &res,
3628                 .rpc_cred       = state->owner->so_cred,
3629         };
3630         struct nfs4_lock_state *lsp;
3631         int status;
3632
3633         arg.lock_owner.clientid = clp->cl_clientid;
3634         status = nfs4_set_lock_state(state, request);
3635         if (status != 0)
3636                 goto out;
3637         lsp = request->fl_u.nfs4_fl.owner;
3638         arg.lock_owner.id = lsp->ls_id.id;
3639         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3640         switch (status) {
3641                 case 0:
3642                         request->fl_type = F_UNLCK;
3643                         break;
3644                 case -NFS4ERR_DENIED:
3645                         status = 0;
3646         }
3647         request->fl_ops->fl_release_private(request);
3648 out:
3649         return status;
3650 }
3651
3652 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3653 {
3654         struct nfs4_exception exception = { };
3655         int err;
3656
3657         do {
3658                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3659                                 _nfs4_proc_getlk(state, cmd, request),
3660                                 &exception);
3661         } while (exception.retry);
3662         return err;
3663 }
3664
3665 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3666 {
3667         int res = 0;
3668         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3669                 case FL_POSIX:
3670                         res = posix_lock_file_wait(file, fl);
3671                         break;
3672                 case FL_FLOCK:
3673                         res = flock_lock_file_wait(file, fl);
3674                         break;
3675                 default:
3676                         BUG();
3677         }
3678         return res;
3679 }
3680
3681 struct nfs4_unlockdata {
3682         struct nfs_locku_args arg;
3683         struct nfs_locku_res res;
3684         struct nfs4_lock_state *lsp;
3685         struct nfs_open_context *ctx;
3686         struct file_lock fl;
3687         const struct nfs_server *server;
3688         unsigned long timestamp;
3689 };
3690
3691 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3692                 struct nfs_open_context *ctx,
3693                 struct nfs4_lock_state *lsp,
3694                 struct nfs_seqid *seqid)
3695 {
3696         struct nfs4_unlockdata *p;
3697         struct inode *inode = lsp->ls_state->inode;
3698
3699         p = kzalloc(sizeof(*p), GFP_KERNEL);
3700         if (p == NULL)
3701                 return NULL;
3702         p->arg.fh = NFS_FH(inode);
3703         p->arg.fl = &p->fl;
3704         p->arg.seqid = seqid;
3705         p->res.seqid = seqid;
3706         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3707         p->arg.stateid = &lsp->ls_stateid;
3708         p->lsp = lsp;
3709         atomic_inc(&lsp->ls_count);
3710         /* Ensure we don't close file until we're done freeing locks! */
3711         p->ctx = get_nfs_open_context(ctx);
3712         memcpy(&p->fl, fl, sizeof(p->fl));
3713         p->server = NFS_SERVER(inode);
3714         return p;
3715 }
3716
3717 static void nfs4_locku_release_calldata(void *data)
3718 {
3719         struct nfs4_unlockdata *calldata = data;
3720         nfs_free_seqid(calldata->arg.seqid);
3721         nfs4_put_lock_state(calldata->lsp);
3722         put_nfs_open_context(calldata->ctx);
3723         kfree(calldata);
3724 }
3725
3726 static void nfs4_locku_done(struct rpc_task *task, void *data)
3727 {
3728         struct nfs4_unlockdata *calldata = data;
3729
3730         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3731                            task->tk_status);
3732         if (RPC_ASSASSINATED(task))
3733                 return;
3734         switch (task->tk_status) {
3735                 case 0:
3736                         memcpy(calldata->lsp->ls_stateid.data,
3737                                         calldata->res.stateid.data,
3738                                         sizeof(calldata->lsp->ls_stateid.data));
3739                         renew_lease(calldata->server, calldata->timestamp);
3740                         break;
3741                 case -NFS4ERR_BAD_STATEID:
3742                 case -NFS4ERR_OLD_STATEID:
3743                 case -NFS4ERR_STALE_STATEID:
3744                 case -NFS4ERR_EXPIRED:
3745                         break;
3746                 default:
3747                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3748                                 nfs_restart_rpc(task,
3749                                                  calldata->server->nfs_client);
3750         }
3751 }
3752
3753 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3754 {
3755         struct nfs4_unlockdata *calldata = data;
3756
3757         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3758                 return;
3759         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3760                 /* Note: exit _without_ running nfs4_locku_done */
3761                 task->tk_action = NULL;
3762                 return;
3763         }
3764         calldata->timestamp = jiffies;
3765         if (nfs4_setup_sequence(calldata->server->nfs_client,
3766                                 &calldata->arg.seq_args,
3767                                 &calldata->res.seq_res, 1, task))
3768                 return;
3769         rpc_call_start(task);
3770 }
3771
3772 static const struct rpc_call_ops nfs4_locku_ops = {
3773         .rpc_call_prepare = nfs4_locku_prepare,
3774         .rpc_call_done = nfs4_locku_done,
3775         .rpc_release = nfs4_locku_release_calldata,
3776 };
3777
3778 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3779                 struct nfs_open_context *ctx,
3780                 struct nfs4_lock_state *lsp,
3781                 struct nfs_seqid *seqid)
3782 {
3783         struct nfs4_unlockdata *data;
3784         struct rpc_message msg = {
3785                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3786                 .rpc_cred = ctx->cred,
3787         };
3788         struct rpc_task_setup task_setup_data = {
3789                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3790                 .rpc_message = &msg,
3791                 .callback_ops = &nfs4_locku_ops,
3792                 .workqueue = nfsiod_workqueue,
3793                 .flags = RPC_TASK_ASYNC,
3794         };
3795
3796         /* Ensure this is an unlock - when canceling a lock, the
3797          * canceled lock is passed in, and it won't be an unlock.
3798          */
3799         fl->fl_type = F_UNLCK;
3800
3801         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3802         if (data == NULL) {
3803                 nfs_free_seqid(seqid);
3804                 return ERR_PTR(-ENOMEM);
3805         }
3806
3807         msg.rpc_argp = &data->arg,
3808         msg.rpc_resp = &data->res,
3809         task_setup_data.callback_data = data;
3810         return rpc_run_task(&task_setup_data);
3811 }
3812
3813 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3814 {
3815         struct nfs_inode *nfsi = NFS_I(state->inode);
3816         struct nfs_seqid *seqid;
3817         struct nfs4_lock_state *lsp;
3818         struct rpc_task *task;
3819         int status = 0;
3820         unsigned char fl_flags = request->fl_flags;
3821
3822         status = nfs4_set_lock_state(state, request);
3823         /* Unlock _before_ we do the RPC call */
3824         request->fl_flags |= FL_EXISTS;
3825         down_read(&nfsi->rwsem);
3826         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3827                 up_read(&nfsi->rwsem);
3828                 goto out;
3829         }
3830         up_read(&nfsi->rwsem);
3831         if (status != 0)
3832                 goto out;
3833         /* Is this a delegated lock? */
3834         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3835                 goto out;
3836         lsp = request->fl_u.nfs4_fl.owner;
3837         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3838         status = -ENOMEM;
3839         if (seqid == NULL)
3840                 goto out;
3841         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3842         status = PTR_ERR(task);
3843         if (IS_ERR(task))
3844                 goto out;
3845         status = nfs4_wait_for_completion_rpc_task(task);
3846         rpc_put_task(task);
3847 out:
3848         request->fl_flags = fl_flags;
3849         return status;
3850 }
3851
3852 struct nfs4_lockdata {
3853         struct nfs_lock_args arg;
3854         struct nfs_lock_res res;
3855         struct nfs4_lock_state *lsp;
3856         struct nfs_open_context *ctx;
3857         struct file_lock fl;
3858         unsigned long timestamp;
3859         int rpc_status;
3860         int cancelled;
3861         struct nfs_server *server;
3862 };
3863
3864 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3865                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3866 {
3867         struct nfs4_lockdata *p;
3868         struct inode *inode = lsp->ls_state->inode;
3869         struct nfs_server *server = NFS_SERVER(inode);
3870
3871         p = kzalloc(sizeof(*p), GFP_KERNEL);
3872         if (p == NULL)
3873                 return NULL;
3874
3875         p->arg.fh = NFS_FH(inode);
3876         p->arg.fl = &p->fl;
3877         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3878         if (p->arg.open_seqid == NULL)
3879                 goto out_free;
3880         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3881         if (p->arg.lock_seqid == NULL)
3882                 goto out_free_seqid;
3883         p->arg.lock_stateid = &lsp->ls_stateid;
3884         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3885         p->arg.lock_owner.id = lsp->ls_id.id;
3886         p->res.lock_seqid = p->arg.lock_seqid;
3887         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3888         p->lsp = lsp;
3889         p->server = server;
3890         atomic_inc(&lsp->ls_count);
3891         p->ctx = get_nfs_open_context(ctx);
3892         memcpy(&p->fl, fl, sizeof(p->fl));
3893         return p;
3894 out_free_seqid:
3895         nfs_free_seqid(p->arg.open_seqid);
3896 out_free:
3897         kfree(p);
3898         return NULL;
3899 }
3900
3901 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3902 {
3903         struct nfs4_lockdata *data = calldata;
3904         struct nfs4_state *state = data->lsp->ls_state;
3905
3906         dprintk("%s: begin!\n", __func__);
3907         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3908                 return;
3909         /* Do we need to do an open_to_lock_owner? */
3910         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3911                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3912                         return;
3913                 data->arg.open_stateid = &state->stateid;
3914                 data->arg.new_lock_owner = 1;
3915                 data->res.open_seqid = data->arg.open_seqid;
3916         } else
3917                 data->arg.new_lock_owner = 0;
3918         data->timestamp = jiffies;
3919         if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
3920                                 &data->res.seq_res, 1, task))
3921                 return;
3922         rpc_call_start(task);
3923         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3924 }
3925
3926 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3927 {
3928         struct nfs4_lockdata *data = calldata;
3929
3930         dprintk("%s: begin!\n", __func__);
3931
3932         nfs4_sequence_done(data->server, &data->res.seq_res,
3933                         task->tk_status);
3934
3935         data->rpc_status = task->tk_status;
3936         if (RPC_ASSASSINATED(task))
3937                 goto out;
3938         if (data->arg.new_lock_owner != 0) {
3939                 if (data->rpc_status == 0)
3940                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3941                 else
3942                         goto out;
3943         }
3944         if (data->rpc_status == 0) {
3945                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3946                                         sizeof(data->lsp->ls_stateid.data));
3947                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3948                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3949         }
3950 out:
3951         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3952 }
3953
3954 static void nfs4_lock_release(void *calldata)
3955 {
3956         struct nfs4_lockdata *data = calldata;
3957
3958         dprintk("%s: begin!\n", __func__);
3959         nfs_free_seqid(data->arg.open_seqid);
3960         if (data->cancelled != 0) {
3961                 struct rpc_task *task;
3962                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3963                                 data->arg.lock_seqid);
3964                 if (!IS_ERR(task))
3965                         rpc_put_task(task);
3966                 dprintk("%s: cancelling lock!\n", __func__);
3967         } else
3968                 nfs_free_seqid(data->arg.lock_seqid);
3969         nfs4_put_lock_state(data->lsp);
3970         put_nfs_open_context(data->ctx);
3971         kfree(data);
3972         dprintk("%s: done!\n", __func__);
3973 }
3974
3975 static const struct rpc_call_ops nfs4_lock_ops = {
3976         .rpc_call_prepare = nfs4_lock_prepare,
3977         .rpc_call_done = nfs4_lock_done,
3978         .rpc_release = nfs4_lock_release,
3979 };
3980
3981 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3982 {
3983         struct nfs4_lockdata *data;
3984         struct rpc_task *task;
3985         struct rpc_message msg = {
3986                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3987                 .rpc_cred = state->owner->so_cred,
3988         };
3989         struct rpc_task_setup task_setup_data = {
3990                 .rpc_client = NFS_CLIENT(state->inode),
3991                 .rpc_message = &msg,
3992                 .callback_ops = &nfs4_lock_ops,
3993                 .workqueue = nfsiod_workqueue,
3994                 .flags = RPC_TASK_ASYNC,
3995         };
3996         int ret;
3997
3998         dprintk("%s: begin!\n", __func__);
3999         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4000                         fl->fl_u.nfs4_fl.owner);
4001         if (data == NULL)
4002                 return -ENOMEM;
4003         if (IS_SETLKW(cmd))
4004                 data->arg.block = 1;
4005         if (reclaim != 0)
4006                 data->arg.reclaim = 1;
4007         msg.rpc_argp = &data->arg,
4008         msg.rpc_resp = &data->res,
4009         task_setup_data.callback_data = data;
4010         task = rpc_run_task(&task_setup_data);
4011         if (IS_ERR(task))
4012                 return PTR_ERR(task);
4013         ret = nfs4_wait_for_completion_rpc_task(task);
4014         if (ret == 0) {
4015                 ret = data->rpc_status;
4016         } else
4017                 data->cancelled = 1;
4018         rpc_put_task(task);
4019         dprintk("%s: done, ret = %d!\n", __func__, ret);
4020         return ret;
4021 }
4022
4023 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4024 {
4025         struct nfs_server *server = NFS_SERVER(state->inode);
4026         struct nfs4_exception exception = { };
4027         int err;
4028
4029         do {
4030                 /* Cache the lock if possible... */
4031                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4032                         return 0;
4033                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
4034                 if (err != -NFS4ERR_DELAY)
4035                         break;
4036                 nfs4_handle_exception(server, err, &exception);
4037         } while (exception.retry);
4038         return err;
4039 }
4040
4041 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4042 {
4043         struct nfs_server *server = NFS_SERVER(state->inode);
4044         struct nfs4_exception exception = { };
4045         int err;
4046
4047         err = nfs4_set_lock_state(state, request);
4048         if (err != 0)
4049                 return err;
4050         do {
4051                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4052                         return 0;
4053                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
4054                 switch (err) {
4055                 default:
4056                         goto out;
4057                 case -NFS4ERR_GRACE:
4058                 case -NFS4ERR_DELAY:
4059                         nfs4_handle_exception(server, err, &exception);
4060                         err = 0;
4061                 }
4062         } while (exception.retry);
4063 out:
4064         return err;
4065 }
4066
4067 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4068 {
4069         struct nfs_inode *nfsi = NFS_I(state->inode);
4070         unsigned char fl_flags = request->fl_flags;
4071         int status;
4072
4073         /* Is this a delegated open? */
4074         status = nfs4_set_lock_state(state, request);
4075         if (status != 0)
4076                 goto out;
4077         request->fl_flags |= FL_ACCESS;
4078         status = do_vfs_lock(request->fl_file, request);
4079         if (status < 0)
4080                 goto out;
4081         down_read(&nfsi->rwsem);
4082         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4083                 /* Yes: cache locks! */
4084                 /* ...but avoid races with delegation recall... */
4085                 request->fl_flags = fl_flags & ~FL_SLEEP;
4086                 status = do_vfs_lock(request->fl_file, request);
4087                 goto out_unlock;
4088         }
4089         status = _nfs4_do_setlk(state, cmd, request, 0);
4090         if (status != 0)
4091                 goto out_unlock;
4092         /* Note: we always want to sleep here! */
4093         request->fl_flags = fl_flags | FL_SLEEP;
4094         if (do_vfs_lock(request->fl_file, request) < 0)
4095                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4096 out_unlock:
4097         up_read(&nfsi->rwsem);
4098 out:
4099         request->fl_flags = fl_flags;
4100         return status;
4101 }
4102
4103 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4104 {
4105         struct nfs4_exception exception = { };
4106         int err;
4107
4108         do {
4109                 err = _nfs4_proc_setlk(state, cmd, request);
4110                 if (err == -NFS4ERR_DENIED)
4111                         err = -EAGAIN;
4112                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4113                                 err, &exception);
4114         } while (exception.retry);
4115         return err;
4116 }
4117
4118 static int
4119 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4120 {
4121         struct nfs_open_context *ctx;
4122         struct nfs4_state *state;
4123         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4124         int status;
4125
4126         /* verify open state */
4127         ctx = nfs_file_open_context(filp);
4128         state = ctx->state;
4129
4130         if (request->fl_start < 0 || request->fl_end < 0)
4131                 return -EINVAL;
4132
4133         if (IS_GETLK(cmd)) {
4134                 if (state != NULL)
4135                         return nfs4_proc_getlk(state, F_GETLK, request);
4136                 return 0;
4137         }
4138
4139         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4140                 return -EINVAL;
4141
4142         if (request->fl_type == F_UNLCK) {
4143                 if (state != NULL)
4144                         return nfs4_proc_unlck(state, cmd, request);
4145                 return 0;
4146         }
4147
4148         if (state == NULL)
4149                 return -ENOLCK;
4150         do {
4151                 status = nfs4_proc_setlk(state, cmd, request);
4152                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4153                         break;
4154                 timeout = nfs4_set_lock_task_retry(timeout);
4155                 status = -ERESTARTSYS;
4156                 if (signalled())
4157                         break;
4158         } while(status < 0);
4159         return status;
4160 }
4161
4162 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4163 {
4164         struct nfs_server *server = NFS_SERVER(state->inode);
4165         struct nfs4_exception exception = { };
4166         int err;
4167
4168         err = nfs4_set_lock_state(state, fl);
4169         if (err != 0)
4170                 goto out;
4171         do {
4172                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
4173                 switch (err) {
4174                         default:
4175                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4176                                                 __func__, err);
4177                         case 0:
4178                         case -ESTALE:
4179                                 goto out;
4180                         case -NFS4ERR_EXPIRED:
4181                         case -NFS4ERR_STALE_CLIENTID:
4182                         case -NFS4ERR_STALE_STATEID:
4183                         case -NFS4ERR_BADSESSION:
4184                         case -NFS4ERR_BADSLOT:
4185                         case -NFS4ERR_BAD_HIGH_SLOT:
4186                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4187                         case -NFS4ERR_DEADSESSION:
4188                                 nfs4_schedule_state_recovery(server->nfs_client);
4189                                 goto out;
4190                         case -ERESTARTSYS:
4191                                 /*
4192                                  * The show must go on: exit, but mark the
4193                                  * stateid as needing recovery.
4194                                  */
4195                         case -NFS4ERR_ADMIN_REVOKED:
4196                         case -NFS4ERR_BAD_STATEID:
4197                         case -NFS4ERR_OPENMODE:
4198                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4199                                 err = 0;
4200                                 goto out;
4201                         case -ENOMEM:
4202                         case -NFS4ERR_DENIED:
4203                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4204                                 err = 0;
4205                                 goto out;
4206                         case -NFS4ERR_DELAY:
4207                                 break;
4208                 }
4209                 err = nfs4_handle_exception(server, err, &exception);
4210         } while (exception.retry);
4211 out:
4212         return err;
4213 }
4214
4215 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4216
4217 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4218                 size_t buflen, int flags)
4219 {
4220         struct inode *inode = dentry->d_inode;
4221
4222         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4223                 return -EOPNOTSUPP;
4224
4225         return nfs4_proc_set_acl(inode, buf, buflen);
4226 }
4227
4228 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4229  * and that's what we'll do for e.g. user attributes that haven't been set.
4230  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4231  * attributes in kernel-managed attribute namespaces. */
4232 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4233                 size_t buflen)
4234 {
4235         struct inode *inode = dentry->d_inode;
4236
4237         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4238                 return -EOPNOTSUPP;
4239
4240         return nfs4_proc_get_acl(inode, buf, buflen);
4241 }
4242
4243 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4244 {
4245         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4246
4247         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4248                 return 0;
4249         if (buf && buflen < len)
4250                 return -ERANGE;
4251         if (buf)
4252                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4253         return len;
4254 }
4255
4256 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4257 {
4258         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4259                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4260                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4261                 return;
4262
4263         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4264                 NFS_ATTR_FATTR_NLINK;
4265         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4266         fattr->nlink = 2;
4267 }
4268
4269 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4270                 struct nfs4_fs_locations *fs_locations, struct page *page)
4271 {
4272         struct nfs_server *server = NFS_SERVER(dir);
4273         u32 bitmask[2] = {
4274                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4275                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4276         };
4277         struct nfs4_fs_locations_arg args = {
4278                 .dir_fh = NFS_FH(dir),
4279                 .name = name,
4280                 .page = page,
4281                 .bitmask = bitmask,
4282         };
4283         struct nfs4_fs_locations_res res = {
4284                 .fs_locations = fs_locations,
4285         };
4286         struct rpc_message msg = {
4287                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4288                 .rpc_argp = &args,
4289                 .rpc_resp = &res,
4290         };
4291         int status;
4292
4293         dprintk("%s: start\n", __func__);
4294         nfs_fattr_init(&fs_locations->fattr);
4295         fs_locations->server = server;
4296         fs_locations->nlocations = 0;
4297         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4298         nfs_fixup_referral_attributes(&fs_locations->fattr);
4299         dprintk("%s: returned status = %d\n", __func__, status);
4300         return status;
4301 }
4302
4303 #ifdef CONFIG_NFS_V4_1
4304 /*
4305  * nfs4_proc_exchange_id()
4306  *
4307  * Since the clientid has expired, all compounds using sessions
4308  * associated with the stale clientid will be returning
4309  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4310  * be in some phase of session reset.
4311  */
4312 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4313 {
4314         nfs4_verifier verifier;
4315         struct nfs41_exchange_id_args args = {
4316                 .client = clp,
4317                 .flags = clp->cl_exchange_flags,
4318         };
4319         struct nfs41_exchange_id_res res = {
4320                 .client = clp,
4321         };
4322         int status;
4323         struct rpc_message msg = {
4324                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4325                 .rpc_argp = &args,
4326                 .rpc_resp = &res,
4327                 .rpc_cred = cred,
4328         };
4329         __be32 *p;
4330
4331         dprintk("--> %s\n", __func__);
4332         BUG_ON(clp == NULL);
4333
4334         /* Remove server-only flags */
4335         args.flags &= ~EXCHGID4_FLAG_CONFIRMED_R;
4336
4337         p = (u32 *)verifier.data;
4338         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4339         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4340         args.verifier = &verifier;
4341
4342         while (1) {
4343                 args.id_len = scnprintf(args.id, sizeof(args.id),
4344                                         "%s/%s %u",
4345                                         clp->cl_ipaddr,
4346                                         rpc_peeraddr2str(clp->cl_rpcclient,
4347                                                          RPC_DISPLAY_ADDR),
4348                                         clp->cl_id_uniquifier);
4349
4350                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4351
4352                 if (status != NFS4ERR_CLID_INUSE)
4353                         break;
4354
4355                 if (signalled())
4356                         break;
4357
4358                 if (++clp->cl_id_uniquifier == 0)
4359                         break;
4360         }
4361
4362         dprintk("<-- %s status= %d\n", __func__, status);
4363         return status;
4364 }
4365
4366 struct nfs4_get_lease_time_data {
4367         struct nfs4_get_lease_time_args *args;
4368         struct nfs4_get_lease_time_res *res;
4369         struct nfs_client *clp;
4370 };
4371
4372 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4373                                         void *calldata)
4374 {
4375         int ret;
4376         struct nfs4_get_lease_time_data *data =
4377                         (struct nfs4_get_lease_time_data *)calldata;
4378
4379         dprintk("--> %s\n", __func__);
4380         /* just setup sequence, do not trigger session recovery
4381            since we're invoked within one */
4382         ret = nfs41_setup_sequence(data->clp->cl_session,
4383                                         &data->args->la_seq_args,
4384                                         &data->res->lr_seq_res, 0, task);
4385
4386         BUG_ON(ret == -EAGAIN);
4387         rpc_call_start(task);
4388         dprintk("<-- %s\n", __func__);
4389 }
4390
4391 /*
4392  * Called from nfs4_state_manager thread for session setup, so don't recover
4393  * from sequence operation or clientid errors.
4394  */
4395 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4396 {
4397         struct nfs4_get_lease_time_data *data =
4398                         (struct nfs4_get_lease_time_data *)calldata;
4399
4400         dprintk("--> %s\n", __func__);
4401         nfs41_sequence_done(data->clp, &data->res->lr_seq_res, task->tk_status);
4402         switch (task->tk_status) {
4403         case -NFS4ERR_DELAY:
4404         case -NFS4ERR_GRACE:
4405                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4406                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4407                 task->tk_status = 0;
4408                 nfs_restart_rpc(task, data->clp);
4409                 return;
4410         }
4411         dprintk("<-- %s\n", __func__);
4412 }
4413
4414 struct rpc_call_ops nfs4_get_lease_time_ops = {
4415         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4416         .rpc_call_done = nfs4_get_lease_time_done,
4417 };
4418
4419 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4420 {
4421         struct rpc_task *task;
4422         struct nfs4_get_lease_time_args args;
4423         struct nfs4_get_lease_time_res res = {
4424                 .lr_fsinfo = fsinfo,
4425         };
4426         struct nfs4_get_lease_time_data data = {
4427                 .args = &args,
4428                 .res = &res,
4429                 .clp = clp,
4430         };
4431         struct rpc_message msg = {
4432                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4433                 .rpc_argp = &args,
4434                 .rpc_resp = &res,
4435         };
4436         struct rpc_task_setup task_setup = {
4437                 .rpc_client = clp->cl_rpcclient,
4438                 .rpc_message = &msg,
4439                 .callback_ops = &nfs4_get_lease_time_ops,
4440                 .callback_data = &data
4441         };
4442         int status;
4443
4444         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4445         dprintk("--> %s\n", __func__);
4446         task = rpc_run_task(&task_setup);
4447
4448         if (IS_ERR(task))
4449                 status = PTR_ERR(task);
4450         else {
4451                 status = task->tk_status;
4452                 rpc_put_task(task);
4453         }
4454         dprintk("<-- %s return %d\n", __func__, status);
4455
4456         return status;
4457 }
4458
4459 /*
4460  * Reset a slot table
4461  */
4462 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, int max_slots,
4463                 int old_max_slots, int ivalue)
4464 {
4465         int i;
4466         int ret = 0;
4467
4468         dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__, max_slots, tbl);
4469
4470         /*
4471          * Until we have dynamic slot table adjustment, insist
4472          * upon the same slot table size
4473          */
4474         if (max_slots != old_max_slots) {
4475                 dprintk("%s reset slot table does't match old\n",
4476                         __func__);
4477                 ret = -EINVAL; /*XXX NFS4ERR_REQ_TOO_BIG ? */
4478                 goto out;
4479         }
4480         spin_lock(&tbl->slot_tbl_lock);
4481         for (i = 0; i < max_slots; ++i)
4482                 tbl->slots[i].seq_nr = ivalue;
4483         spin_unlock(&tbl->slot_tbl_lock);
4484         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4485                 tbl, tbl->slots, tbl->max_slots);
4486 out:
4487         dprintk("<-- %s: return %d\n", __func__, ret);
4488         return ret;
4489 }
4490
4491 /*
4492  * Reset the forechannel and backchannel slot tables
4493  */
4494 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4495 {
4496         int status;
4497
4498         status = nfs4_reset_slot_table(&session->fc_slot_table,
4499                         session->fc_attrs.max_reqs,
4500                         session->fc_slot_table.max_slots,
4501                         1);
4502         if (status)
4503                 return status;
4504
4505         status = nfs4_reset_slot_table(&session->bc_slot_table,
4506                         session->bc_attrs.max_reqs,
4507                         session->bc_slot_table.max_slots,
4508                         0);
4509         return status;
4510 }
4511
4512 /* Destroy the slot table */
4513 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4514 {
4515         if (session->fc_slot_table.slots != NULL) {
4516                 kfree(session->fc_slot_table.slots);
4517                 session->fc_slot_table.slots = NULL;
4518         }
4519         if (session->bc_slot_table.slots != NULL) {
4520                 kfree(session->bc_slot_table.slots);
4521                 session->bc_slot_table.slots = NULL;
4522         }
4523         return;
4524 }
4525
4526 /*
4527  * Initialize slot table
4528  */
4529 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4530                 int max_slots, int ivalue)
4531 {
4532         struct nfs4_slot *slot;
4533         int ret = -ENOMEM;
4534
4535         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4536
4537         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4538
4539         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_KERNEL);
4540         if (!slot)
4541                 goto out;
4542         ret = 0;
4543
4544         spin_lock(&tbl->slot_tbl_lock);
4545         tbl->max_slots = max_slots;
4546         tbl->slots = slot;
4547         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4548         spin_unlock(&tbl->slot_tbl_lock);
4549         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4550                 tbl, tbl->slots, tbl->max_slots);
4551 out:
4552         dprintk("<-- %s: return %d\n", __func__, ret);
4553         return ret;
4554 }
4555
4556 /*
4557  * Initialize the forechannel and backchannel tables
4558  */
4559 static int nfs4_init_slot_tables(struct nfs4_session *session)
4560 {
4561         struct nfs4_slot_table *tbl;
4562         int status = 0;
4563
4564         tbl = &session->fc_slot_table;
4565         if (tbl->slots == NULL) {
4566                 status = nfs4_init_slot_table(tbl,
4567                                 session->fc_attrs.max_reqs, 1);
4568                 if (status)
4569                         return status;
4570         }
4571
4572         tbl = &session->bc_slot_table;
4573         if (tbl->slots == NULL) {
4574                 status = nfs4_init_slot_table(tbl,
4575                                 session->bc_attrs.max_reqs, 0);
4576                 if (status)
4577                         nfs4_destroy_slot_tables(session);
4578         }
4579
4580         return status;
4581 }
4582
4583 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4584 {
4585         struct nfs4_session *session;
4586         struct nfs4_slot_table *tbl;
4587
4588         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4589         if (!session)
4590                 return NULL;
4591
4592         /*
4593          * The create session reply races with the server back
4594          * channel probe. Mark the client NFS_CS_SESSION_INITING
4595          * so that the client back channel can find the
4596          * nfs_client struct
4597          */
4598         clp->cl_cons_state = NFS_CS_SESSION_INITING;
4599         init_completion(&session->complete);
4600
4601         tbl = &session->fc_slot_table;
4602         tbl->highest_used_slotid = -1;
4603         spin_lock_init(&tbl->slot_tbl_lock);
4604         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4605
4606         tbl = &session->bc_slot_table;
4607         tbl->highest_used_slotid = -1;
4608         spin_lock_init(&tbl->slot_tbl_lock);
4609         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4610
4611         session->clp = clp;
4612         return session;
4613 }
4614
4615 void nfs4_destroy_session(struct nfs4_session *session)
4616 {
4617         nfs4_proc_destroy_session(session);
4618         dprintk("%s Destroy backchannel for xprt %p\n",
4619                 __func__, session->clp->cl_rpcclient->cl_xprt);
4620         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4621                                 NFS41_BC_MIN_CALLBACKS);
4622         nfs4_destroy_slot_tables(session);
4623         kfree(session);
4624 }
4625
4626 /*
4627  * Initialize the values to be used by the client in CREATE_SESSION
4628  * If nfs4_init_session set the fore channel request and response sizes,
4629  * use them.
4630  *
4631  * Set the back channel max_resp_sz_cached to zero to force the client to
4632  * always set csa_cachethis to FALSE because the current implementation
4633  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4634  */
4635 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4636 {
4637         struct nfs4_session *session = args->client->cl_session;
4638         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4639                      mxresp_sz = session->fc_attrs.max_resp_sz;
4640
4641         if (mxrqst_sz == 0)
4642                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4643         if (mxresp_sz == 0)
4644                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4645         /* Fore channel attributes */
4646         args->fc_attrs.headerpadsz = 0;
4647         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4648         args->fc_attrs.max_resp_sz = mxresp_sz;
4649         args->fc_attrs.max_resp_sz_cached = mxresp_sz;
4650         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4651         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4652
4653         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4654                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4655                 __func__,
4656                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4657                 args->fc_attrs.max_resp_sz_cached, args->fc_attrs.max_ops,
4658                 args->fc_attrs.max_reqs);
4659
4660         /* Back channel attributes */
4661         args->bc_attrs.headerpadsz = 0;
4662         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4663         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4664         args->bc_attrs.max_resp_sz_cached = 0;
4665         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4666         args->bc_attrs.max_reqs = 1;
4667
4668         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4669                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4670                 __func__,
4671                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4672                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4673                 args->bc_attrs.max_reqs);
4674 }
4675
4676 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4677 {
4678         if (rcvd <= sent)
4679                 return 0;
4680         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4681                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4682         return -EINVAL;
4683 }
4684
4685 #define _verify_fore_channel_attr(_name_) \
4686         _verify_channel_attr("fore", #_name_, \
4687                              args->fc_attrs._name_, \
4688                              session->fc_attrs._name_)
4689
4690 #define _verify_back_channel_attr(_name_) \
4691         _verify_channel_attr("back", #_name_, \
4692                              args->bc_attrs._name_, \
4693                              session->bc_attrs._name_)
4694
4695 /*
4696  * The server is not allowed to increase the fore channel header pad size,
4697  * maximum response size, or maximum number of operations.
4698  *
4699  * The back channel attributes are only negotiatied down: We send what the
4700  * (back channel) server insists upon.
4701  */
4702 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4703                                      struct nfs4_session *session)
4704 {
4705         int ret = 0;
4706
4707         ret |= _verify_fore_channel_attr(headerpadsz);
4708         ret |= _verify_fore_channel_attr(max_resp_sz);
4709         ret |= _verify_fore_channel_attr(max_ops);
4710
4711         ret |= _verify_back_channel_attr(headerpadsz);
4712         ret |= _verify_back_channel_attr(max_rqst_sz);
4713         ret |= _verify_back_channel_attr(max_resp_sz);
4714         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4715         ret |= _verify_back_channel_attr(max_ops);
4716         ret |= _verify_back_channel_attr(max_reqs);
4717
4718         return ret;
4719 }
4720
4721 static int _nfs4_proc_create_session(struct nfs_client *clp)
4722 {
4723         struct nfs4_session *session = clp->cl_session;
4724         struct nfs41_create_session_args args = {
4725                 .client = clp,
4726                 .cb_program = NFS4_CALLBACK,
4727         };
4728         struct nfs41_create_session_res res = {
4729                 .client = clp,
4730         };
4731         struct rpc_message msg = {
4732                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4733                 .rpc_argp = &args,
4734                 .rpc_resp = &res,
4735         };
4736         int status;
4737
4738         nfs4_init_channel_attrs(&args);
4739         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4740
4741         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4742
4743         if (!status)
4744                 /* Verify the session's negotiated channel_attrs values */
4745                 status = nfs4_verify_channel_attrs(&args, session);
4746         if (!status) {
4747                 /* Increment the clientid slot sequence id */
4748                 clp->cl_seqid++;
4749         }
4750
4751         return status;
4752 }
4753
4754 /*
4755  * Issues a CREATE_SESSION operation to the server.
4756  * It is the responsibility of the caller to verify the session is
4757  * expired before calling this routine.
4758  */
4759 int nfs4_proc_create_session(struct nfs_client *clp)
4760 {
4761         int status;
4762         unsigned *ptr;
4763         struct nfs4_session *session = clp->cl_session;
4764
4765         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4766
4767         status = _nfs4_proc_create_session(clp);
4768         if (status)
4769                 goto out;
4770
4771         /* Init and reset the fore channel */
4772         status = nfs4_init_slot_tables(session);
4773         dprintk("slot table initialization returned %d\n", status);
4774         if (status)
4775                 goto out;
4776         status = nfs4_reset_slot_tables(session);
4777         dprintk("slot table reset returned %d\n", status);
4778         if (status)
4779                 goto out;
4780
4781         ptr = (unsigned *)&session->sess_id.data[0];
4782         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4783                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4784 out:
4785         dprintk("<-- %s\n", __func__);
4786         return status;
4787 }
4788
4789 /*
4790  * Issue the over-the-wire RPC DESTROY_SESSION.
4791  * The caller must serialize access to this routine.
4792  */
4793 int nfs4_proc_destroy_session(struct nfs4_session *session)
4794 {
4795         int status = 0;
4796         struct rpc_message msg;
4797
4798         dprintk("--> nfs4_proc_destroy_session\n");
4799
4800         /* session is still being setup */
4801         if (session->clp->cl_cons_state != NFS_CS_READY)
4802                 return status;
4803
4804         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4805         msg.rpc_argp = session;
4806         msg.rpc_resp = NULL;
4807         msg.rpc_cred = NULL;
4808         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4809
4810         if (status)
4811                 printk(KERN_WARNING
4812                         "Got error %d from the server on DESTROY_SESSION. "
4813                         "Session has been destroyed regardless...\n", status);
4814
4815         dprintk("<-- nfs4_proc_destroy_session\n");
4816         return status;
4817 }
4818
4819 int nfs4_init_session(struct nfs_server *server)
4820 {
4821         struct nfs_client *clp = server->nfs_client;
4822         struct nfs4_session *session;
4823         int ret;
4824
4825         if (!nfs4_has_session(clp))
4826                 return 0;
4827
4828         session = clp->cl_session;
4829         session->fc_attrs.max_rqst_sz = server->wsize + nfs41_maxwrite_overhead;
4830         session->fc_attrs.max_resp_sz = server->rsize + nfs41_maxread_overhead;
4831
4832         ret = nfs4_recover_expired_lease(server);
4833         if (!ret)
4834                 ret = nfs4_check_client_ready(clp);
4835         return ret;
4836 }
4837
4838 /*
4839  * Renew the cl_session lease.
4840  */
4841 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
4842 {
4843         struct nfs4_sequence_args args;
4844         struct nfs4_sequence_res res;
4845
4846         struct rpc_message msg = {
4847                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4848                 .rpc_argp = &args,
4849                 .rpc_resp = &res,
4850                 .rpc_cred = cred,
4851         };
4852
4853         args.sa_cache_this = 0;
4854
4855         return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
4856                                        &res, 0);
4857 }
4858
4859 void nfs41_sequence_call_done(struct rpc_task *task, void *data)
4860 {
4861         struct nfs_client *clp = (struct nfs_client *)data;
4862
4863         nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);
4864
4865         if (task->tk_status < 0) {
4866                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
4867
4868                 if (_nfs4_async_handle_error(task, NULL, clp, NULL)
4869                                                                 == -EAGAIN) {
4870                         nfs_restart_rpc(task, clp);
4871                         return;
4872                 }
4873         }
4874         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
4875
4876         kfree(task->tk_msg.rpc_argp);
4877         kfree(task->tk_msg.rpc_resp);
4878
4879         dprintk("<-- %s\n", __func__);
4880 }
4881
4882 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
4883 {
4884         struct nfs_client *clp;
4885         struct nfs4_sequence_args *args;
4886         struct nfs4_sequence_res *res;
4887
4888         clp = (struct nfs_client *)data;
4889         args = task->tk_msg.rpc_argp;
4890         res = task->tk_msg.rpc_resp;
4891
4892         if (nfs4_setup_sequence(clp, args, res, 0, task))
4893                 return;
4894         rpc_call_start(task);
4895 }
4896
4897 static const struct rpc_call_ops nfs41_sequence_ops = {
4898         .rpc_call_done = nfs41_sequence_call_done,
4899         .rpc_call_prepare = nfs41_sequence_prepare,
4900 };
4901
4902 static int nfs41_proc_async_sequence(struct nfs_client *clp,
4903                                      struct rpc_cred *cred)
4904 {
4905         struct nfs4_sequence_args *args;
4906         struct nfs4_sequence_res *res;
4907         struct rpc_message msg = {
4908                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4909                 .rpc_cred = cred,
4910         };
4911
4912         args = kzalloc(sizeof(*args), GFP_KERNEL);
4913         if (!args)
4914                 return -ENOMEM;
4915         res = kzalloc(sizeof(*res), GFP_KERNEL);
4916         if (!res) {
4917                 kfree(args);
4918                 return -ENOMEM;
4919         }
4920         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
4921         msg.rpc_argp = args;
4922         msg.rpc_resp = res;
4923
4924         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
4925                               &nfs41_sequence_ops, (void *)clp);
4926 }
4927
4928 struct nfs4_reclaim_complete_data {
4929         struct nfs_client *clp;
4930         struct nfs41_reclaim_complete_args arg;
4931         struct nfs41_reclaim_complete_res res;
4932 };
4933
4934 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
4935 {
4936         struct nfs4_reclaim_complete_data *calldata = data;
4937
4938         if (nfs4_setup_sequence(calldata->clp, &calldata->arg.seq_args,
4939                                 &calldata->res.seq_res, 0, task))
4940                 return;
4941
4942         rpc_call_start(task);
4943 }
4944
4945 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
4946 {
4947         struct nfs4_reclaim_complete_data *calldata = data;
4948         struct nfs_client *clp = calldata->clp;
4949         struct nfs4_sequence_res *res = &calldata->res.seq_res;
4950
4951         dprintk("--> %s\n", __func__);
4952         nfs41_sequence_done(clp, res, task->tk_status);
4953         switch (task->tk_status) {
4954         case 0:
4955         case -NFS4ERR_COMPLETE_ALREADY:
4956                 break;
4957         case -NFS4ERR_BADSESSION:
4958         case -NFS4ERR_DEADSESSION:
4959                 /*
4960                  * Handle the session error, but do not retry the operation, as
4961                  * we have no way of telling whether the clientid had to be
4962                  * reset before we got our reply.  If reset, a new wave of
4963                  * reclaim operations will follow, containing their own reclaim
4964                  * complete.  We don't want our retry to get on the way of
4965                  * recovery by incorrectly indicating to the server that we're
4966                  * done reclaiming state since the process had to be restarted.
4967                  */
4968                 _nfs4_async_handle_error(task, NULL, clp, NULL);
4969                 break;
4970         default:
4971                 if (_nfs4_async_handle_error(
4972                                 task, NULL, clp, NULL) == -EAGAIN) {
4973                         rpc_restart_call_prepare(task);
4974                         return;
4975                 }
4976         }
4977
4978         dprintk("<-- %s\n", __func__);
4979 }
4980
4981 static void nfs4_free_reclaim_complete_data(void *data)
4982 {
4983         struct nfs4_reclaim_complete_data *calldata = data;
4984
4985         kfree(calldata);
4986 }
4987
4988 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
4989         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
4990         .rpc_call_done = nfs4_reclaim_complete_done,
4991         .rpc_release = nfs4_free_reclaim_complete_data,
4992 };
4993
4994 /*
4995  * Issue a global reclaim complete.
4996  */
4997 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
4998 {
4999         struct nfs4_reclaim_complete_data *calldata;
5000         struct rpc_task *task;
5001         struct rpc_message msg = {
5002                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5003         };
5004         struct rpc_task_setup task_setup_data = {
5005                 .rpc_client = clp->cl_rpcclient,
5006                 .rpc_message = &msg,
5007                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5008                 .flags = RPC_TASK_ASYNC,
5009         };
5010         int status = -ENOMEM;
5011
5012         dprintk("--> %s\n", __func__);
5013         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
5014         if (calldata == NULL)
5015                 goto out;
5016         calldata->clp = clp;
5017         calldata->arg.one_fs = 0;
5018         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
5019
5020         msg.rpc_argp = &calldata->arg;
5021         msg.rpc_resp = &calldata->res;
5022         task_setup_data.callback_data = calldata;
5023         task = rpc_run_task(&task_setup_data);
5024         if (IS_ERR(task))
5025                 status = PTR_ERR(task);
5026         rpc_put_task(task);
5027 out:
5028         dprintk("<-- %s status=%d\n", __func__, status);
5029         return status;
5030 }
5031 #endif /* CONFIG_NFS_V4_1 */
5032
5033 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5034         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5035         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5036         .recover_open   = nfs4_open_reclaim,
5037         .recover_lock   = nfs4_lock_reclaim,
5038         .establish_clid = nfs4_init_clientid,
5039         .get_clid_cred  = nfs4_get_setclientid_cred,
5040 };
5041
5042 #if defined(CONFIG_NFS_V4_1)
5043 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5044         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5045         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5046         .recover_open   = nfs4_open_reclaim,
5047         .recover_lock   = nfs4_lock_reclaim,
5048         .establish_clid = nfs41_init_clientid,
5049         .get_clid_cred  = nfs4_get_exchange_id_cred,
5050         .reclaim_complete = nfs41_proc_reclaim_complete,
5051 };
5052 #endif /* CONFIG_NFS_V4_1 */
5053
5054 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5055         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5056         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5057         .recover_open   = nfs4_open_expired,
5058         .recover_lock   = nfs4_lock_expired,
5059         .establish_clid = nfs4_init_clientid,
5060         .get_clid_cred  = nfs4_get_setclientid_cred,
5061 };
5062
5063 #if defined(CONFIG_NFS_V4_1)
5064 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5065         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5066         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5067         .recover_open   = nfs4_open_expired,
5068         .recover_lock   = nfs4_lock_expired,
5069         .establish_clid = nfs41_init_clientid,
5070         .get_clid_cred  = nfs4_get_exchange_id_cred,
5071 };
5072 #endif /* CONFIG_NFS_V4_1 */
5073
5074 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5075         .sched_state_renewal = nfs4_proc_async_renew,
5076         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5077         .renew_lease = nfs4_proc_renew,
5078 };
5079
5080 #if defined(CONFIG_NFS_V4_1)
5081 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5082         .sched_state_renewal = nfs41_proc_async_sequence,
5083         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5084         .renew_lease = nfs4_proc_sequence,
5085 };
5086 #endif
5087
5088 /*
5089  * Per minor version reboot and network partition recovery ops
5090  */
5091
5092 struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[] = {
5093         &nfs40_reboot_recovery_ops,
5094 #if defined(CONFIG_NFS_V4_1)
5095         &nfs41_reboot_recovery_ops,
5096 #endif
5097 };
5098
5099 struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[] = {
5100         &nfs40_nograce_recovery_ops,
5101 #if defined(CONFIG_NFS_V4_1)
5102         &nfs41_nograce_recovery_ops,
5103 #endif
5104 };
5105
5106 struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[] = {
5107         &nfs40_state_renewal_ops,
5108 #if defined(CONFIG_NFS_V4_1)
5109         &nfs41_state_renewal_ops,
5110 #endif
5111 };
5112
5113 static const struct inode_operations nfs4_file_inode_operations = {
5114         .permission     = nfs_permission,
5115         .getattr        = nfs_getattr,
5116         .setattr        = nfs_setattr,
5117         .getxattr       = nfs4_getxattr,
5118         .setxattr       = nfs4_setxattr,
5119         .listxattr      = nfs4_listxattr,
5120 };
5121
5122 const struct nfs_rpc_ops nfs_v4_clientops = {
5123         .version        = 4,                    /* protocol version */
5124         .dentry_ops     = &nfs4_dentry_operations,
5125         .dir_inode_ops  = &nfs4_dir_inode_operations,
5126         .file_inode_ops = &nfs4_file_inode_operations,
5127         .getroot        = nfs4_proc_get_root,
5128         .getattr        = nfs4_proc_getattr,
5129         .setattr        = nfs4_proc_setattr,
5130         .lookupfh       = nfs4_proc_lookupfh,
5131         .lookup         = nfs4_proc_lookup,
5132         .access         = nfs4_proc_access,
5133         .readlink       = nfs4_proc_readlink,
5134         .create         = nfs4_proc_create,
5135         .remove         = nfs4_proc_remove,
5136         .unlink_setup   = nfs4_proc_unlink_setup,
5137         .unlink_done    = nfs4_proc_unlink_done,
5138         .rename         = nfs4_proc_rename,
5139         .link           = nfs4_proc_link,
5140         .symlink        = nfs4_proc_symlink,
5141         .mkdir          = nfs4_proc_mkdir,
5142         .rmdir          = nfs4_proc_remove,
5143         .readdir        = nfs4_proc_readdir,
5144         .mknod          = nfs4_proc_mknod,
5145         .statfs         = nfs4_proc_statfs,
5146         .fsinfo         = nfs4_proc_fsinfo,
5147         .pathconf       = nfs4_proc_pathconf,
5148         .set_capabilities = nfs4_server_capabilities,
5149         .decode_dirent  = nfs4_decode_dirent,
5150         .read_setup     = nfs4_proc_read_setup,
5151         .read_done      = nfs4_read_done,
5152         .write_setup    = nfs4_proc_write_setup,
5153         .write_done     = nfs4_write_done,
5154         .commit_setup   = nfs4_proc_commit_setup,
5155         .commit_done    = nfs4_commit_done,
5156         .lock           = nfs4_proc_lock,
5157         .clear_acl_cache = nfs4_zap_acl_attr,
5158         .close_context  = nfs4_close_context,
5159 };
5160
5161 /*
5162  * Local variables:
5163  *  c-basic-offset: 8
5164  * End:
5165  */