fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/string.h>
  42 #include <linux/sunrpc/clnt.h>
  43 #include <linux/nfs.h>
  44 #include <linux/nfs4.h>
  45 #include <linux/nfs_fs.h>
  46 #include <linux/nfs_page.h>
  47 #include <linux/namei.h>
  48 #include <linux/mount.h>
  49 #include <linux/module.h>
  50 #include <linux/sunrpc/bc_xprt.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "internal.h"
  55 #include "iostat.h"
  56 #include "callback.h"
  57
  58 #define NFSDBG_FACILITY         NFSDBG_PROC
  59
  60 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  61 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  62
  63 #define NFS4_MAX_LOOP_ON_RECOVER (10)
  64
  65 struct nfs4_opendata;
  66 static int _nfs4_proc_open(struct nfs4_opendata *data);
  67 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  68 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  69 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  70 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  71
  72 /* Prevent leaks of NFSv4 errors into userland */
  73 static int nfs4_map_errors(int err)
  74 {
  75         if (err >= -1000)
  76                 return err;
  77         switch (err) {
  78         case -NFS4ERR_RESOURCE:
  79                 return -EREMOTEIO;
  80         default:
  81                 dprintk("%s could not handle NFSv4 error %d\n",
  82                                 __func__, -err);
  83                 break;
  84         }
  85         return -EIO;
  86 }
  87
  88 /*
  89  * This is our standard bitmap for GETATTR requests.
  90  */
  91 const u32 nfs4_fattr_bitmap[2] = {
  92         FATTR4_WORD0_TYPE
  93         | FATTR4_WORD0_CHANGE
  94         | FATTR4_WORD0_SIZE
  95         | FATTR4_WORD0_FSID
  96         | FATTR4_WORD0_FILEID,
  97         FATTR4_WORD1_MODE
  98         | FATTR4_WORD1_NUMLINKS
  99         | FATTR4_WORD1_OWNER
 100         | FATTR4_WORD1_OWNER_GROUP
 101         | FATTR4_WORD1_RAWDEV
 102         | FATTR4_WORD1_SPACE_USED
 103         | FATTR4_WORD1_TIME_ACCESS
 104         | FATTR4_WORD1_TIME_METADATA
 105         | FATTR4_WORD1_TIME_MODIFY
 106 };
 107
 108 const u32 nfs4_statfs_bitmap[2] = {
 109         FATTR4_WORD0_FILES_AVAIL
 110         | FATTR4_WORD0_FILES_FREE
 111         | FATTR4_WORD0_FILES_TOTAL,
 112         FATTR4_WORD1_SPACE_AVAIL
 113         | FATTR4_WORD1_SPACE_FREE
 114         | FATTR4_WORD1_SPACE_TOTAL
 115 };
 116
 117 const u32 nfs4_pathconf_bitmap[2] = {
 118         FATTR4_WORD0_MAXLINK
 119         | FATTR4_WORD0_MAXNAME,
 120         0
 121 };
 122
 123 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 124                         | FATTR4_WORD0_MAXREAD
 125                         | FATTR4_WORD0_MAXWRITE
 126                         | FATTR4_WORD0_LEASE_TIME,
 127                         0
 128 };
 129
 130 const u32 nfs4_fs_locations_bitmap[2] = {
 131         FATTR4_WORD0_TYPE
 132         | FATTR4_WORD0_CHANGE
 133         | FATTR4_WORD0_SIZE
 134         | FATTR4_WORD0_FSID
 135         | FATTR4_WORD0_FILEID
 136         | FATTR4_WORD0_FS_LOCATIONS,
 137         FATTR4_WORD1_MODE
 138         | FATTR4_WORD1_NUMLINKS
 139         | FATTR4_WORD1_OWNER
 140         | FATTR4_WORD1_OWNER_GROUP
 141         | FATTR4_WORD1_RAWDEV
 142         | FATTR4_WORD1_SPACE_USED
 143         | FATTR4_WORD1_TIME_ACCESS
 144         | FATTR4_WORD1_TIME_METADATA
 145         | FATTR4_WORD1_TIME_MODIFY
 146         | FATTR4_WORD1_MOUNTED_ON_FILEID
 147 };
 148
 149 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 150                 struct nfs4_readdir_arg *readdir)
 151 {
 152         __be32 *start, *p;
 153
 154         BUG_ON(readdir->count < 80);
 155         if (cookie > 2) {
 156                 readdir->cookie = cookie;
 157                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 158                 return;
 159         }
 160
 161         readdir->cookie = 0;
 162         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 163         if (cookie == 2)
 164                 return;
 165
 166         /*
 167          * NFSv4 servers do not return entries for '.' and '..'
 168          * Therefore, we fake these entries here.  We let '.'
 169          * have cookie 0 and '..' have cookie 1.  Note that
 170          * when talking to the server, we always send cookie 0
 171          * instead of 1 or 2.
 172          */
 173         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 174
 175         if (cookie == 0) {
 176                 *p++ = xdr_one;                                  /* next */
 177                 *p++ = xdr_zero;                   /* cookie, first word */
 178                 *p++ = xdr_one;                   /* cookie, second word */
 179                 *p++ = xdr_one;                             /* entry len */
 180                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 181                 p++;
 182                 *p++ = xdr_one;                         /* bitmap length */
 183                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 184                 *p++ = htonl(8);              /* attribute buffer length */
 185                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 186         }
 187
 188         *p++ = xdr_one;                                  /* next */
 189         *p++ = xdr_zero;                   /* cookie, first word */
 190         *p++ = xdr_two;                   /* cookie, second word */
 191         *p++ = xdr_two;                             /* entry len */
 192         memcpy(p, "..\0\0", 4);                         /* entry */
 193         p++;
 194         *p++ = xdr_one;                         /* bitmap length */
 195         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 196         *p++ = htonl(8);              /* attribute buffer length */
 197         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 198
 199         readdir->pgbase = (char *)p - (char *)start;
 200         readdir->count -= readdir->pgbase;
 201         kunmap_atomic(start, KM_USER0);
 202 }
 203
 204 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 205 {
 206         int res;
 207
 208         might_sleep();
 209
 210         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 211                         nfs_wait_bit_killable, TASK_KILLABLE);
 212         return res;
 213 }
 214
 215 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 216 {
 217         int res = 0;
 218
 219         might_sleep();
 220
 221         if (*timeout <= 0)
 222                 *timeout = NFS4_POLL_RETRY_MIN;
 223         if (*timeout > NFS4_POLL_RETRY_MAX)
 224                 *timeout = NFS4_POLL_RETRY_MAX;
 225         schedule_timeout_killable(*timeout);
 226         if (fatal_signal_pending(current))
 227                 res = -ERESTARTSYS;
 228         *timeout <<= 1;
 229         return res;
 230 }
 231
 232 /* This is the error handling routine for processes that are allowed
 233  * to sleep.
 234  */
 235 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 236 {
 237         struct nfs_client *clp = server->nfs_client;
 238         struct nfs4_state *state = exception->state;
 239         int ret = errorcode;
 240
 241         exception->retry = 0;
 242         switch(errorcode) {
 243                 case 0:
 244                         return 0;
 245                 case -NFS4ERR_ADMIN_REVOKED:
 246                 case -NFS4ERR_BAD_STATEID:
 247                 case -NFS4ERR_OPENMODE:
 248                         if (state == NULL)
 249                                 break;
 250                         nfs4_state_mark_reclaim_nograce(clp, state);
 251                 case -NFS4ERR_STALE_CLIENTID:
 252                 case -NFS4ERR_STALE_STATEID:
 253                 case -NFS4ERR_EXPIRED:
 254                         nfs4_schedule_state_recovery(clp);
 255                         ret = nfs4_wait_clnt_recover(clp);
 256                         if (ret == 0)
 257                                 exception->retry = 1;
 258 #if !defined(CONFIG_NFS_V4_1)
 259                         break;
 260 #else /* !defined(CONFIG_NFS_V4_1) */
 261                         if (!nfs4_has_session(server->nfs_client))
 262                                 break;
 263                         /* FALLTHROUGH */
 264                 case -NFS4ERR_BADSESSION:
 265                 case -NFS4ERR_BADSLOT:
 266                 case -NFS4ERR_BAD_HIGH_SLOT:
 267                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 268                 case -NFS4ERR_DEADSESSION:
 269                 case -NFS4ERR_SEQ_FALSE_RETRY:
 270                 case -NFS4ERR_SEQ_MISORDERED:
 271                         dprintk("%s ERROR: %d Reset session\n", __func__,
 272                                 errorcode);
 273                         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
 274                         exception->retry = 1;
 275                         /* FALLTHROUGH */
 276 #endif /* !defined(CONFIG_NFS_V4_1) */
 277                 case -NFS4ERR_FILE_OPEN:
 278                 case -NFS4ERR_GRACE:
 279                 case -NFS4ERR_DELAY:
 280                         ret = nfs4_delay(server->client, &exception->timeout);
 281                         if (ret != 0)
 282                                 break;
 283                 case -NFS4ERR_OLD_STATEID:
 284                         exception->retry = 1;
 285         }
 286         /* We failed to handle the error */
 287         return nfs4_map_errors(ret);
 288 }
 289
 290
 291 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 292 {
 293         struct nfs_client *clp = server->nfs_client;
 294         spin_lock(&clp->cl_lock);
 295         if (time_before(clp->cl_last_renewal,timestamp))
 296                 clp->cl_last_renewal = timestamp;
 297         spin_unlock(&clp->cl_lock);
 298 }
 299
 300 #if defined(CONFIG_NFS_V4_1)
 301
 302 /*
 303  * nfs4_free_slot - free a slot and efficiently update slot table.
 304  *
 305  * freeing a slot is trivially done by clearing its respective bit
 306  * in the bitmap.
 307  * If the freed slotid equals highest_used_slotid we want to update it
 308  * so that the server would be able to size down the slot table if needed,
 309  * otherwise we know that the highest_used_slotid is still in use.
 310  * When updating highest_used_slotid there may be "holes" in the bitmap
 311  * so we need to scan down from highest_used_slotid to 0 looking for the now
 312  * highest slotid in use.
 313  * If none found, highest_used_slotid is set to -1.
 314  */
 315 static void
 316 nfs4_free_slot(struct nfs4_slot_table *tbl, u8 free_slotid)
 317 {
 318         int slotid = free_slotid;
 319
 320         spin_lock(&tbl->slot_tbl_lock);
 321         /* clear used bit in bitmap */
 322         __clear_bit(slotid, tbl->used_slots);
 323
 324         /* update highest_used_slotid when it is freed */
 325         if (slotid == tbl->highest_used_slotid) {
 326                 slotid = find_last_bit(tbl->used_slots, tbl->max_slots);
 327                 if (slotid >= 0 && slotid < tbl->max_slots)
 328                         tbl->highest_used_slotid = slotid;
 329                 else
 330                         tbl->highest_used_slotid = -1;
 331         }
 332         rpc_wake_up_next(&tbl->slot_tbl_waitq);
 333         spin_unlock(&tbl->slot_tbl_lock);
 334         dprintk("%s: free_slotid %u highest_used_slotid %d\n", __func__,
 335                 free_slotid, tbl->highest_used_slotid);
 336 }
 337
 338 void nfs41_sequence_free_slot(const struct nfs_client *clp,
 339                               struct nfs4_sequence_res *res)
 340 {
 341         struct nfs4_slot_table *tbl;
 342
 343         if (!nfs4_has_session(clp)) {
 344                 dprintk("%s: No session\n", __func__);
 345                 return;
 346         }
 347         tbl = &clp->cl_session->fc_slot_table;
 348         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE) {
 349                 dprintk("%s: No slot\n", __func__);
 350                 /* just wake up the next guy waiting since
 351                  * we may have not consumed a slot after all */
 352                 rpc_wake_up_next(&tbl->slot_tbl_waitq);
 353                 return;
 354         }
 355         nfs4_free_slot(tbl, res->sr_slotid);
 356         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 357 }
 358
 359 static void nfs41_sequence_done(struct nfs_client *clp,
 360                                 struct nfs4_sequence_res *res,
 361                                 int rpc_status)
 362 {
 363         unsigned long timestamp;
 364         struct nfs4_slot_table *tbl;
 365         struct nfs4_slot *slot;
 366
 367         /*
 368          * sr_status remains 1 if an RPC level error occurred. The server
 369          * may or may not have processed the sequence operation..
 370          * Proceed as if the server received and processed the sequence
 371          * operation.
 372          */
 373         if (res->sr_status == 1)
 374                 res->sr_status = NFS_OK;
 375
 376         /* -ERESTARTSYS can result in skipping nfs41_sequence_setup */
 377         if (res->sr_slotid == NFS4_MAX_SLOT_TABLE)
 378                 goto out;
 379
 380         tbl = &clp->cl_session->fc_slot_table;
 381         slot = tbl->slots + res->sr_slotid;
 382
 383         if (res->sr_status == 0) {
 384                 /* Update the slot's sequence and clientid lease timer */
 385                 ++slot->seq_nr;
 386                 timestamp = res->sr_renewal_time;
 387                 spin_lock(&clp->cl_lock);
 388                 if (time_before(clp->cl_last_renewal, timestamp))
 389                         clp->cl_last_renewal = timestamp;
 390                 spin_unlock(&clp->cl_lock);
 391                 return;
 392         }
 393 out:
 394         /* The session may be reset by one of the error handlers. */
 395         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 396         nfs41_sequence_free_slot(clp, res);
 397 }
 398
 399 /*
 400  * nfs4_find_slot - efficiently look for a free slot
 401  *
 402  * nfs4_find_slot looks for an unset bit in the used_slots bitmap.
 403  * If found, we mark the slot as used, update the highest_used_slotid,
 404  * and respectively set up the sequence operation args.
 405  * The slot number is returned if found, or NFS4_MAX_SLOT_TABLE otherwise.
 406  *
 407  * Note: must be called with under the slot_tbl_lock.
 408  */
 409 static u8
 410 nfs4_find_slot(struct nfs4_slot_table *tbl, struct rpc_task *task)
 411 {
 412         int slotid;
 413         u8 ret_id = NFS4_MAX_SLOT_TABLE;
 414         BUILD_BUG_ON((u8)NFS4_MAX_SLOT_TABLE != (int)NFS4_MAX_SLOT_TABLE);
 415
 416         dprintk("--> %s used_slots=%04lx highest_used=%d max_slots=%d\n",
 417                 __func__, tbl->used_slots[0], tbl->highest_used_slotid,
 418                 tbl->max_slots);
 419         slotid = find_first_zero_bit(tbl->used_slots, tbl->max_slots);
 420         if (slotid >= tbl->max_slots)
 421                 goto out;
 422         __set_bit(slotid, tbl->used_slots);
 423         if (slotid > tbl->highest_used_slotid)
 424                 tbl->highest_used_slotid = slotid;
 425         ret_id = slotid;
 426 out:
 427         dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
 428                 __func__, tbl->used_slots[0], tbl->highest_used_slotid, ret_id);
 429         return ret_id;
 430 }
 431
 432 static int nfs4_recover_session(struct nfs4_session *session)
 433 {
 434         struct nfs_client *clp = session->clp;
 435         unsigned int loop;
 436         int ret;
 437
 438         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
 439                 ret = nfs4_wait_clnt_recover(clp);
 440                 if (ret != 0)
 441                         break;
 442                 if (!test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state))
 443                         break;
 444                 nfs4_schedule_state_manager(clp);
 445                 ret = -EIO;
 446         }
 447         return ret;
 448 }
 449
 450 static int nfs41_setup_sequence(struct nfs4_session *session,
 451                                 struct nfs4_sequence_args *args,
 452                                 struct nfs4_sequence_res *res,
 453                                 int cache_reply,
 454                                 struct rpc_task *task)
 455 {
 456         struct nfs4_slot *slot;
 457         struct nfs4_slot_table *tbl;
 458         int status = 0;
 459         u8 slotid;
 460
 461         dprintk("--> %s\n", __func__);
 462         /* slot already allocated? */
 463         if (res->sr_slotid != NFS4_MAX_SLOT_TABLE)
 464                 return 0;
 465
 466         memset(res, 0, sizeof(*res));
 467         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 468         tbl = &session->fc_slot_table;
 469
 470         spin_lock(&tbl->slot_tbl_lock);
 471         if (test_bit(NFS4CLNT_SESSION_SETUP, &session->clp->cl_state)) {
 472                 if (tbl->highest_used_slotid != -1) {
 473                         rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 474                         spin_unlock(&tbl->slot_tbl_lock);
 475                         dprintk("<-- %s: Session reset: draining\n", __func__);
 476                         return -EAGAIN;
 477                 }
 478
 479                 /* The slot table is empty; start the reset thread */
 480                 dprintk("%s Session Reset\n", __func__);
 481                 spin_unlock(&tbl->slot_tbl_lock);
 482                 status = nfs4_recover_session(session);
 483                 if (status)
 484                         return status;
 485                 spin_lock(&tbl->slot_tbl_lock);
 486         }
 487
 488         slotid = nfs4_find_slot(tbl, task);
 489         if (slotid == NFS4_MAX_SLOT_TABLE) {
 490                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 491                 spin_unlock(&tbl->slot_tbl_lock);
 492                 dprintk("<-- %s: no free slots\n", __func__);
 493                 return -EAGAIN;
 494         }
 495         spin_unlock(&tbl->slot_tbl_lock);
 496
 497         slot = tbl->slots + slotid;
 498         args->sa_session = session;
 499         args->sa_slotid = slotid;
 500         args->sa_cache_this = cache_reply;
 501
 502         dprintk("<-- %s slotid=%d seqid=%d\n", __func__, slotid, slot->seq_nr);
 503
 504         res->sr_session = session;
 505         res->sr_slotid = slotid;
 506         res->sr_renewal_time = jiffies;
 507         /*
 508          * sr_status is only set in decode_sequence, and so will remain
 509          * set to 1 if an rpc level failure occurs.
 510          */
 511         res->sr_status = 1;
 512         return 0;
 513 }
 514
 515 int nfs4_setup_sequence(struct nfs_client *clp,
 516                         struct nfs4_sequence_args *args,
 517                         struct nfs4_sequence_res *res,
 518                         int cache_reply,
 519                         struct rpc_task *task)
 520 {
 521         int ret = 0;
 522
 523         dprintk("--> %s clp %p session %p sr_slotid %d\n",
 524                 __func__, clp, clp->cl_session, res->sr_slotid);
 525
 526         if (!nfs4_has_session(clp))
 527                 goto out;
 528         ret = nfs41_setup_sequence(clp->cl_session, args, res, cache_reply,
 529                                    task);
 530         if (ret != -EAGAIN) {
 531                 /* terminate rpc task */
 532                 task->tk_status = ret;
 533                 task->tk_action = NULL;
 534         }
 535 out:
 536         dprintk("<-- %s status=%d\n", __func__, ret);
 537         return ret;
 538 }
 539
 540 struct nfs41_call_sync_data {
 541         struct nfs_client *clp;
 542         struct nfs4_sequence_args *seq_args;
 543         struct nfs4_sequence_res *seq_res;
 544         int cache_reply;
 545 };
 546
 547 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 548 {
 549         struct nfs41_call_sync_data *data = calldata;
 550
 551         dprintk("--> %s data->clp->cl_session %p\n", __func__,
 552                 data->clp->cl_session);
 553         if (nfs4_setup_sequence(data->clp, data->seq_args,
 554                                 data->seq_res, data->cache_reply, task))
 555                 return;
 556         rpc_call_start(task);
 557 }
 558
 559 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 560 {
 561         struct nfs41_call_sync_data *data = calldata;
 562
 563         nfs41_sequence_done(data->clp, data->seq_res, task->tk_status);
 564         nfs41_sequence_free_slot(data->clp, data->seq_res);
 565 }
 566
 567 struct rpc_call_ops nfs41_call_sync_ops = {
 568         .rpc_call_prepare = nfs41_call_sync_prepare,
 569         .rpc_call_done = nfs41_call_sync_done,
 570 };
 571
 572 static int nfs4_call_sync_sequence(struct nfs_client *clp,
 573                                    struct rpc_clnt *clnt,
 574                                    struct rpc_message *msg,
 575                                    struct nfs4_sequence_args *args,
 576                                    struct nfs4_sequence_res *res,
 577                                    int cache_reply)
 578 {
 579         int ret;
 580         struct rpc_task *task;
 581         struct nfs41_call_sync_data data = {
 582                 .clp = clp,
 583                 .seq_args = args,
 584                 .seq_res = res,
 585                 .cache_reply = cache_reply,
 586         };
 587         struct rpc_task_setup task_setup = {
 588                 .rpc_client = clnt,
 589                 .rpc_message = msg,
 590                 .callback_ops = &nfs41_call_sync_ops,
 591                 .callback_data = &data
 592         };
 593
 594         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
 595         task = rpc_run_task(&task_setup);
 596         if (IS_ERR(task))
 597                 ret = PTR_ERR(task);
 598         else {
 599                 ret = task->tk_status;
 600                 rpc_put_task(task);
 601         }
 602         return ret;
 603 }
 604
 605 int _nfs4_call_sync_session(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         return nfs4_call_sync_sequence(server->nfs_client, server->client,
 612                                        msg, args, res, cache_reply);
 613 }
 614
 615 #endif /* CONFIG_NFS_V4_1 */
 616
 617 int _nfs4_call_sync(struct nfs_server *server,
 618                     struct rpc_message *msg,
 619                     struct nfs4_sequence_args *args,
 620                     struct nfs4_sequence_res *res,
 621                     int cache_reply)
 622 {
 623         args->sa_session = res->sr_session = NULL;
 624         return rpc_call_sync(server->client, msg, 0);
 625 }
 626
 627 #define nfs4_call_sync(server, msg, args, res, cache_reply) \
 628         (server)->nfs_client->cl_call_sync((server), (msg), &(args)->seq_args, \
 629                         &(res)->seq_res, (cache_reply))
 630
 631 static void nfs4_sequence_done(const struct nfs_server *server,
 632                                struct nfs4_sequence_res *res, int rpc_status)
 633 {
 634 #ifdef CONFIG_NFS_V4_1
 635         if (nfs4_has_session(server->nfs_client))
 636                 nfs41_sequence_done(server->nfs_client, res, rpc_status);
 637 #endif /* CONFIG_NFS_V4_1 */
 638 }
 639
 640 /* no restart, therefore free slot here */
 641 static void nfs4_sequence_done_free_slot(const struct nfs_server *server,
 642                                          struct nfs4_sequence_res *res,
 643                                          int rpc_status)
 644 {
 645         nfs4_sequence_done(server, res, rpc_status);
 646         nfs4_sequence_free_slot(server->nfs_client, res);
 647 }
 648
 649 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 650 {
 651         struct nfs_inode *nfsi = NFS_I(dir);
 652
 653         spin_lock(&dir->i_lock);
 654         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 655         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 656                 nfs_force_lookup_revalidate(dir);
 657         nfsi->change_attr = cinfo->after;
 658         spin_unlock(&dir->i_lock);
 659 }
 660
 661 struct nfs4_opendata {
 662         struct kref kref;
 663         struct nfs_openargs o_arg;
 664         struct nfs_openres o_res;
 665         struct nfs_open_confirmargs c_arg;
 666         struct nfs_open_confirmres c_res;
 667         struct nfs_fattr f_attr;
 668         struct nfs_fattr dir_attr;
 669         struct path path;
 670         struct dentry *dir;
 671         struct nfs4_state_owner *owner;
 672         struct nfs4_state *state;
 673         struct iattr attrs;
 674         unsigned long timestamp;
 675         unsigned int rpc_done : 1;
 676         int rpc_status;
 677         int cancelled;
 678 };
 679
 680
 681 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 682 {
 683         p->o_res.f_attr = &p->f_attr;
 684         p->o_res.dir_attr = &p->dir_attr;
 685         p->o_res.seqid = p->o_arg.seqid;
 686         p->c_res.seqid = p->c_arg.seqid;
 687         p->o_res.server = p->o_arg.server;
 688         nfs_fattr_init(&p->f_attr);
 689         nfs_fattr_init(&p->dir_attr);
 690         p->o_res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
 691 }
 692
 693 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 694                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 695                 const struct iattr *attrs)
 696 {
 697         struct dentry *parent = dget_parent(path->dentry);
 698         struct inode *dir = parent->d_inode;
 699         struct nfs_server *server = NFS_SERVER(dir);
 700         struct nfs4_opendata *p;
 701
 702         p = kzalloc(sizeof(*p), GFP_KERNEL);
 703         if (p == NULL)
 704                 goto err;
 705         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 706         if (p->o_arg.seqid == NULL)
 707                 goto err_free;
 708         p->path.mnt = mntget(path->mnt);
 709         p->path.dentry = dget(path->dentry);
 710         p->dir = parent;
 711         p->owner = sp;
 712         atomic_inc(&sp->so_count);
 713         p->o_arg.fh = NFS_FH(dir);
 714         p->o_arg.open_flags = flags;
 715         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 716         p->o_arg.clientid = server->nfs_client->cl_clientid;
 717         p->o_arg.id = sp->so_owner_id.id;
 718         p->o_arg.name = &p->path.dentry->d_name;
 719         p->o_arg.server = server;
 720         p->o_arg.bitmask = server->attr_bitmask;
 721         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 722         if (flags & O_EXCL) {
 723                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 724                 s[0] = jiffies;
 725                 s[1] = current->pid;
 726         } else if (flags & O_CREAT) {
 727                 p->o_arg.u.attrs = &p->attrs;
 728                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 729         }
 730         p->c_arg.fh = &p->o_res.fh;
 731         p->c_arg.stateid = &p->o_res.stateid;
 732         p->c_arg.seqid = p->o_arg.seqid;
 733         nfs4_init_opendata_res(p);
 734         kref_init(&p->kref);
 735         return p;
 736 err_free:
 737         kfree(p);
 738 err:
 739         dput(parent);
 740         return NULL;
 741 }
 742
 743 static void nfs4_opendata_free(struct kref *kref)
 744 {
 745         struct nfs4_opendata *p = container_of(kref,
 746                         struct nfs4_opendata, kref);
 747
 748         nfs_free_seqid(p->o_arg.seqid);
 749         if (p->state != NULL)
 750                 nfs4_put_open_state(p->state);
 751         nfs4_put_state_owner(p->owner);
 752         dput(p->dir);
 753         path_put(&p->path);
 754         kfree(p);
 755 }
 756
 757 static void nfs4_opendata_put(struct nfs4_opendata *p)
 758 {
 759         if (p != NULL)
 760                 kref_put(&p->kref, nfs4_opendata_free);
 761 }
 762
 763 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 764 {
 765         int ret;
 766
 767         ret = rpc_wait_for_completion_task(task);
 768         return ret;
 769 }
 770
 771 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 772 {
 773         int ret = 0;
 774
 775         if (open_mode & O_EXCL)
 776                 goto out;
 777         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 778                 case FMODE_READ:
 779                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 780                         break;
 781                 case FMODE_WRITE:
 782                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 783                         break;
 784                 case FMODE_READ|FMODE_WRITE:
 785                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 786         }
 787 out:
 788         return ret;
 789 }
 790
 791 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 792 {
 793         if ((delegation->type & fmode) != fmode)
 794                 return 0;
 795         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 796                 return 0;
 797         nfs_mark_delegation_referenced(delegation);
 798         return 1;
 799 }
 800
 801 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 802 {
 803         switch (fmode) {
 804                 case FMODE_WRITE:
 805                         state->n_wronly++;
 806                         break;
 807                 case FMODE_READ:
 808                         state->n_rdonly++;
 809                         break;
 810                 case FMODE_READ|FMODE_WRITE:
 811                         state->n_rdwr++;
 812         }
 813         nfs4_state_set_mode_locked(state, state->state | fmode);
 814 }
 815
 816 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 817 {
 818         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 819                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 820         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 821         switch (fmode) {
 822                 case FMODE_READ:
 823                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 824                         break;
 825                 case FMODE_WRITE:
 826                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 827                         break;
 828                 case FMODE_READ|FMODE_WRITE:
 829                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 830         }
 831 }
 832
 833 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 834 {
 835         write_seqlock(&state->seqlock);
 836         nfs_set_open_stateid_locked(state, stateid, fmode);
 837         write_sequnlock(&state->seqlock);
 838 }
 839
 840 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 841 {
 842         /*
 843          * Protect the call to nfs4_state_set_mode_locked and
 844          * serialise the stateid update
 845          */
 846         write_seqlock(&state->seqlock);
 847         if (deleg_stateid != NULL) {
 848                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 849                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 850         }
 851         if (open_stateid != NULL)
 852                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 853         write_sequnlock(&state->seqlock);
 854         spin_lock(&state->owner->so_lock);
 855         update_open_stateflags(state, fmode);
 856         spin_unlock(&state->owner->so_lock);
 857 }
 858
 859 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 860 {
 861         struct nfs_inode *nfsi = NFS_I(state->inode);
 862         struct nfs_delegation *deleg_cur;
 863         int ret = 0;
 864
 865         fmode &= (FMODE_READ|FMODE_WRITE);
 866
 867         rcu_read_lock();
 868         deleg_cur = rcu_dereference(nfsi->delegation);
 869         if (deleg_cur == NULL)
 870                 goto no_delegation;
 871
 872         spin_lock(&deleg_cur->lock);
 873         if (nfsi->delegation != deleg_cur ||
 874             (deleg_cur->type & fmode) != fmode)
 875                 goto no_delegation_unlock;
 876
 877         if (delegation == NULL)
 878                 delegation = &deleg_cur->stateid;
 879         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 880                 goto no_delegation_unlock;
 881
 882         nfs_mark_delegation_referenced(deleg_cur);
 883         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 884         ret = 1;
 885 no_delegation_unlock:
 886         spin_unlock(&deleg_cur->lock);
 887 no_delegation:
 888         rcu_read_unlock();
 889
 890         if (!ret && open_stateid != NULL) {
 891                 __update_open_stateid(state, open_stateid, NULL, fmode);
 892                 ret = 1;
 893         }
 894
 895         return ret;
 896 }
 897
 898
 899 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 900 {
 901         struct nfs_delegation *delegation;
 902
 903         rcu_read_lock();
 904         delegation = rcu_dereference(NFS_I(inode)->delegation);
 905         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 906                 rcu_read_unlock();
 907                 return;
 908         }
 909         rcu_read_unlock();
 910         nfs_inode_return_delegation(inode);
 911 }
 912
 913 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 914 {
 915         struct nfs4_state *state = opendata->state;
 916         struct nfs_inode *nfsi = NFS_I(state->inode);
 917         struct nfs_delegation *delegation;
 918         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 919         fmode_t fmode = opendata->o_arg.fmode;
 920         nfs4_stateid stateid;
 921         int ret = -EAGAIN;
 922
 923         for (;;) {
 924                 if (can_open_cached(state, fmode, open_mode)) {
 925                         spin_lock(&state->owner->so_lock);
 926                         if (can_open_cached(state, fmode, open_mode)) {
 927                                 update_open_stateflags(state, fmode);
 928                                 spin_unlock(&state->owner->so_lock);
 929                                 goto out_return_state;
 930                         }
 931                         spin_unlock(&state->owner->so_lock);
 932                 }
 933                 rcu_read_lock();
 934                 delegation = rcu_dereference(nfsi->delegation);
 935                 if (delegation == NULL ||
 936                     !can_open_delegated(delegation, fmode)) {
 937                         rcu_read_unlock();
 938                         break;
 939                 }
 940                 /* Save the delegation */
 941                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 942                 rcu_read_unlock();
 943                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 944                 if (ret != 0)
 945                         goto out;
 946                 ret = -EAGAIN;
 947
 948                 /* Try to update the stateid using the delegation */
 949                 if (update_open_stateid(state, NULL, &stateid, fmode))
 950                         goto out_return_state;
 951         }
 952 out:
 953         return ERR_PTR(ret);
 954 out_return_state:
 955         atomic_inc(&state->count);
 956         return state;
 957 }
 958
 959 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 960 {
 961         struct inode *inode;
 962         struct nfs4_state *state = NULL;
 963         struct nfs_delegation *delegation;
 964         int ret;
 965
 966         if (!data->rpc_done) {
 967                 state = nfs4_try_open_cached(data);
 968                 goto out;
 969         }
 970
 971         ret = -EAGAIN;
 972         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 973                 goto err;
 974         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 975         ret = PTR_ERR(inode);
 976         if (IS_ERR(inode))
 977                 goto err;
 978         ret = -ENOMEM;
 979         state = nfs4_get_open_state(inode, data->owner);
 980         if (state == NULL)
 981                 goto err_put_inode;
 982         if (data->o_res.delegation_type != 0) {
 983                 int delegation_flags = 0;
 984
 985                 rcu_read_lock();
 986                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 987                 if (delegation)
 988                         delegation_flags = delegation->flags;
 989                 rcu_read_unlock();
 990                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
 991                         nfs_inode_set_delegation(state->inode,
 992                                         data->owner->so_cred,
 993                                         &data->o_res);
 994                 else
 995                         nfs_inode_reclaim_delegation(state->inode,
 996                                         data->owner->so_cred,
 997                                         &data->o_res);
 998         }
 999
1000         update_open_stateid(state, &data->o_res.stateid, NULL,
1001                         data->o_arg.fmode);
1002         iput(inode);
1003 out:
1004         return state;
1005 err_put_inode:
1006         iput(inode);
1007 err:
1008         return ERR_PTR(ret);
1009 }
1010
1011 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1012 {
1013         struct nfs_inode *nfsi = NFS_I(state->inode);
1014         struct nfs_open_context *ctx;
1015
1016         spin_lock(&state->inode->i_lock);
1017         list_for_each_entry(ctx, &nfsi->open_files, list) {
1018                 if (ctx->state != state)
1019                         continue;
1020                 get_nfs_open_context(ctx);
1021                 spin_unlock(&state->inode->i_lock);
1022                 return ctx;
1023         }
1024         spin_unlock(&state->inode->i_lock);
1025         return ERR_PTR(-ENOENT);
1026 }
1027
1028 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1029 {
1030         struct nfs4_opendata *opendata;
1031
1032         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
1033         if (opendata == NULL)
1034                 return ERR_PTR(-ENOMEM);
1035         opendata->state = state;
1036         atomic_inc(&state->count);
1037         return opendata;
1038 }
1039
1040 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1041 {
1042         struct nfs4_state *newstate;
1043         int ret;
1044
1045         opendata->o_arg.open_flags = 0;
1046         opendata->o_arg.fmode = fmode;
1047         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1048         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1049         nfs4_init_opendata_res(opendata);
1050         ret = _nfs4_proc_open(opendata);
1051         if (ret != 0)
1052                 return ret;
1053         newstate = nfs4_opendata_to_nfs4_state(opendata);
1054         if (IS_ERR(newstate))
1055                 return PTR_ERR(newstate);
1056         nfs4_close_state(&opendata->path, newstate, fmode);
1057         *res = newstate;
1058         return 0;
1059 }
1060
1061 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1062 {
1063         struct nfs4_state *newstate;
1064         int ret;
1065
1066         /* memory barrier prior to reading state->n_* */
1067         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1068         smp_rmb();
1069         if (state->n_rdwr != 0) {
1070                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1071                 if (ret != 0)
1072                         return ret;
1073                 if (newstate != state)
1074                         return -ESTALE;
1075         }
1076         if (state->n_wronly != 0) {
1077                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1078                 if (ret != 0)
1079                         return ret;
1080                 if (newstate != state)
1081                         return -ESTALE;
1082         }
1083         if (state->n_rdonly != 0) {
1084                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1085                 if (ret != 0)
1086                         return ret;
1087                 if (newstate != state)
1088                         return -ESTALE;
1089         }
1090         /*
1091          * We may have performed cached opens for all three recoveries.
1092          * Check if we need to update the current stateid.
1093          */
1094         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1095             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
1096                 write_seqlock(&state->seqlock);
1097                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1098                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
1099                 write_sequnlock(&state->seqlock);
1100         }
1101         return 0;
1102 }
1103
1104 /*
1105  * OPEN_RECLAIM:
1106  *      reclaim state on the server after a reboot.
1107  */
1108 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1109 {
1110         struct nfs_delegation *delegation;
1111         struct nfs4_opendata *opendata;
1112         fmode_t delegation_type = 0;
1113         int status;
1114
1115         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1116         if (IS_ERR(opendata))
1117                 return PTR_ERR(opendata);
1118         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1119         opendata->o_arg.fh = NFS_FH(state->inode);
1120         rcu_read_lock();
1121         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1122         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1123                 delegation_type = delegation->type;
1124         rcu_read_unlock();
1125         opendata->o_arg.u.delegation_type = delegation_type;
1126         status = nfs4_open_recover(opendata, state);
1127         nfs4_opendata_put(opendata);
1128         return status;
1129 }
1130
1131 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1132 {
1133         struct nfs_server *server = NFS_SERVER(state->inode);
1134         struct nfs4_exception exception = { };
1135         int err;
1136         do {
1137                 err = _nfs4_do_open_reclaim(ctx, state);
1138                 if (err != -NFS4ERR_DELAY)
1139                         break;
1140                 nfs4_handle_exception(server, err, &exception);
1141         } while (exception.retry);
1142         return err;
1143 }
1144
1145 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1146 {
1147         struct nfs_open_context *ctx;
1148         int ret;
1149
1150         ctx = nfs4_state_find_open_context(state);
1151         if (IS_ERR(ctx))
1152                 return PTR_ERR(ctx);
1153         ret = nfs4_do_open_reclaim(ctx, state);
1154         put_nfs_open_context(ctx);
1155         return ret;
1156 }
1157
1158 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1159 {
1160         struct nfs4_opendata *opendata;
1161         int ret;
1162
1163         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1164         if (IS_ERR(opendata))
1165                 return PTR_ERR(opendata);
1166         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1167         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
1168                         sizeof(opendata->o_arg.u.delegation.data));
1169         ret = nfs4_open_recover(opendata, state);
1170         nfs4_opendata_put(opendata);
1171         return ret;
1172 }
1173
1174 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1175 {
1176         struct nfs4_exception exception = { };
1177         struct nfs_server *server = NFS_SERVER(state->inode);
1178         int err;
1179         do {
1180                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1181                 switch (err) {
1182                         case 0:
1183                         case -ENOENT:
1184                         case -ESTALE:
1185                                 goto out;
1186                         case -NFS4ERR_STALE_CLIENTID:
1187                         case -NFS4ERR_STALE_STATEID:
1188                         case -NFS4ERR_EXPIRED:
1189                                 /* Don't recall a delegation if it was lost */
1190                                 nfs4_schedule_state_recovery(server->nfs_client);
1191                                 goto out;
1192                         case -ERESTARTSYS:
1193                                 /*
1194                                  * The show must go on: exit, but mark the
1195                                  * stateid as needing recovery.
1196                                  */
1197                         case -NFS4ERR_ADMIN_REVOKED:
1198                         case -NFS4ERR_BAD_STATEID:
1199                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
1200                         case -ENOMEM:
1201                                 err = 0;
1202                                 goto out;
1203                 }
1204                 err = nfs4_handle_exception(server, err, &exception);
1205         } while (exception.retry);
1206 out:
1207         return err;
1208 }
1209
1210 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1211 {
1212         struct nfs4_opendata *data = calldata;
1213
1214         data->rpc_status = task->tk_status;
1215         if (RPC_ASSASSINATED(task))
1216                 return;
1217         if (data->rpc_status == 0) {
1218                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
1219                                 sizeof(data->o_res.stateid.data));
1220                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1221                 renew_lease(data->o_res.server, data->timestamp);
1222                 data->rpc_done = 1;
1223         }
1224 }
1225
1226 static void nfs4_open_confirm_release(void *calldata)
1227 {
1228         struct nfs4_opendata *data = calldata;
1229         struct nfs4_state *state = NULL;
1230
1231         /* If this request hasn't been cancelled, do nothing */
1232         if (data->cancelled == 0)
1233                 goto out_free;
1234         /* In case of error, no cleanup! */
1235         if (!data->rpc_done)
1236                 goto out_free;
1237         state = nfs4_opendata_to_nfs4_state(data);
1238         if (!IS_ERR(state))
1239                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1240 out_free:
1241         nfs4_opendata_put(data);
1242 }
1243
1244 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1245         .rpc_call_done = nfs4_open_confirm_done,
1246         .rpc_release = nfs4_open_confirm_release,
1247 };
1248
1249 /*
1250  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1251  */
1252 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1253 {
1254         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1255         struct rpc_task *task;
1256         struct  rpc_message msg = {
1257                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1258                 .rpc_argp = &data->c_arg,
1259                 .rpc_resp = &data->c_res,
1260                 .rpc_cred = data->owner->so_cred,
1261         };
1262         struct rpc_task_setup task_setup_data = {
1263                 .rpc_client = server->client,
1264                 .rpc_message = &msg,
1265                 .callback_ops = &nfs4_open_confirm_ops,
1266                 .callback_data = data,
1267                 .workqueue = nfsiod_workqueue,
1268                 .flags = RPC_TASK_ASYNC,
1269         };
1270         int status;
1271
1272         kref_get(&data->kref);
1273         data->rpc_done = 0;
1274         data->rpc_status = 0;
1275         data->timestamp = jiffies;
1276         task = rpc_run_task(&task_setup_data);
1277         if (IS_ERR(task))
1278                 return PTR_ERR(task);
1279         status = nfs4_wait_for_completion_rpc_task(task);
1280         if (status != 0) {
1281                 data->cancelled = 1;
1282                 smp_wmb();
1283         } else
1284                 status = data->rpc_status;
1285         rpc_put_task(task);
1286         return status;
1287 }
1288
1289 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1290 {
1291         struct nfs4_opendata *data = calldata;
1292         struct nfs4_state_owner *sp = data->owner;
1293
1294         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1295                 return;
1296         /*
1297          * Check if we still need to send an OPEN call, or if we can use
1298          * a delegation instead.
1299          */
1300         if (data->state != NULL) {
1301                 struct nfs_delegation *delegation;
1302
1303                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1304                         goto out_no_action;
1305                 rcu_read_lock();
1306                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1307                 if (delegation != NULL &&
1308                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
1309                         rcu_read_unlock();
1310                         goto out_no_action;
1311                 }
1312                 rcu_read_unlock();
1313         }
1314         /* Update sequence id. */
1315         data->o_arg.id = sp->so_owner_id.id;
1316         data->o_arg.clientid = sp->so_client->cl_clientid;
1317         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1318                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1319                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1320         }
1321         data->timestamp = jiffies;
1322         if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
1323                                 &data->o_arg.seq_args,
1324                                 &data->o_res.seq_res, 1, task))
1325                 return;
1326         rpc_call_start(task);
1327         return;
1328 out_no_action:
1329         task->tk_action = NULL;
1330
1331 }
1332
1333 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1334 {
1335         struct nfs4_opendata *data = calldata;
1336
1337         data->rpc_status = task->tk_status;
1338
1339         nfs4_sequence_done_free_slot(data->o_arg.server, &data->o_res.seq_res,
1340                                      task->tk_status);
1341
1342         if (RPC_ASSASSINATED(task))
1343                 return;
1344         if (task->tk_status == 0) {
1345                 switch (data->o_res.f_attr->mode & S_IFMT) {
1346                         case S_IFREG:
1347                                 break;
1348                         case S_IFLNK:
1349                                 data->rpc_status = -ELOOP;
1350                                 break;
1351                         case S_IFDIR:
1352                                 data->rpc_status = -EISDIR;
1353                                 break;
1354                         default:
1355                                 data->rpc_status = -ENOTDIR;
1356                 }
1357                 renew_lease(data->o_res.server, data->timestamp);
1358                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1359                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1360         }
1361         data->rpc_done = 1;
1362 }
1363
1364 static void nfs4_open_release(void *calldata)
1365 {
1366         struct nfs4_opendata *data = calldata;
1367         struct nfs4_state *state = NULL;
1368
1369         /* If this request hasn't been cancelled, do nothing */
1370         if (data->cancelled == 0)
1371                 goto out_free;
1372         /* In case of error, no cleanup! */
1373         if (data->rpc_status != 0 || !data->rpc_done)
1374                 goto out_free;
1375         /* In case we need an open_confirm, no cleanup! */
1376         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1377                 goto out_free;
1378         state = nfs4_opendata_to_nfs4_state(data);
1379         if (!IS_ERR(state))
1380                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
1381 out_free:
1382         nfs4_opendata_put(data);
1383 }
1384
1385 static const struct rpc_call_ops nfs4_open_ops = {
1386         .rpc_call_prepare = nfs4_open_prepare,
1387         .rpc_call_done = nfs4_open_done,
1388         .rpc_release = nfs4_open_release,
1389 };
1390
1391 /*
1392  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1393  */
1394 static int _nfs4_proc_open(struct nfs4_opendata *data)
1395 {
1396         struct inode *dir = data->dir->d_inode;
1397         struct nfs_server *server = NFS_SERVER(dir);
1398         struct nfs_openargs *o_arg = &data->o_arg;
1399         struct nfs_openres *o_res = &data->o_res;
1400         struct rpc_task *task;
1401         struct rpc_message msg = {
1402                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1403                 .rpc_argp = o_arg,
1404                 .rpc_resp = o_res,
1405                 .rpc_cred = data->owner->so_cred,
1406         };
1407         struct rpc_task_setup task_setup_data = {
1408                 .rpc_client = server->client,
1409                 .rpc_message = &msg,
1410                 .callback_ops = &nfs4_open_ops,
1411                 .callback_data = data,
1412                 .workqueue = nfsiod_workqueue,
1413                 .flags = RPC_TASK_ASYNC,
1414         };
1415         int status;
1416
1417         kref_get(&data->kref);
1418         data->rpc_done = 0;
1419         data->rpc_status = 0;
1420         data->cancelled = 0;
1421         task = rpc_run_task(&task_setup_data);
1422         if (IS_ERR(task))
1423                 return PTR_ERR(task);
1424         status = nfs4_wait_for_completion_rpc_task(task);
1425         if (status != 0) {
1426                 data->cancelled = 1;
1427                 smp_wmb();
1428         } else
1429                 status = data->rpc_status;
1430         rpc_put_task(task);
1431         if (status != 0 || !data->rpc_done)
1432                 return status;
1433
1434         if (o_res->fh.size == 0)
1435                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1436
1437         if (o_arg->open_flags & O_CREAT) {
1438                 update_changeattr(dir, &o_res->cinfo);
1439                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1440         } else
1441                 nfs_refresh_inode(dir, o_res->dir_attr);
1442         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1443                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1444         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1445                 status = _nfs4_proc_open_confirm(data);
1446                 if (status != 0)
1447                         return status;
1448         }
1449         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1450                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1451         return 0;
1452 }
1453
1454 static int nfs4_recover_expired_lease(struct nfs_server *server)
1455 {
1456         struct nfs_client *clp = server->nfs_client;
1457         unsigned int loop;
1458         int ret;
1459
1460         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1461                 ret = nfs4_wait_clnt_recover(clp);
1462                 if (ret != 0)
1463                         break;
1464                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1465                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1466                         break;
1467                 nfs4_schedule_state_recovery(clp);
1468                 ret = -EIO;
1469         }
1470         return ret;
1471 }
1472
1473 /*
1474  * OPEN_EXPIRED:
1475  *      reclaim state on the server after a network partition.
1476  *      Assumes caller holds the appropriate lock
1477  */
1478 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1479 {
1480         struct nfs4_opendata *opendata;
1481         int ret;
1482
1483         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1484         if (IS_ERR(opendata))
1485                 return PTR_ERR(opendata);
1486         ret = nfs4_open_recover(opendata, state);
1487         if (ret == -ESTALE)
1488                 d_drop(ctx->path.dentry);
1489         nfs4_opendata_put(opendata);
1490         return ret;
1491 }
1492
1493 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1494 {
1495         struct nfs_server *server = NFS_SERVER(state->inode);
1496         struct nfs4_exception exception = { };
1497         int err;
1498
1499         do {
1500                 err = _nfs4_open_expired(ctx, state);
1501                 if (err != -NFS4ERR_DELAY)
1502                         break;
1503                 nfs4_handle_exception(server, err, &exception);
1504         } while (exception.retry);
1505         return err;
1506 }
1507
1508 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1509 {
1510         struct nfs_open_context *ctx;
1511         int ret;
1512
1513         ctx = nfs4_state_find_open_context(state);
1514         if (IS_ERR(ctx))
1515                 return PTR_ERR(ctx);
1516         ret = nfs4_do_open_expired(ctx, state);
1517         put_nfs_open_context(ctx);
1518         return ret;
1519 }
1520
1521 /*
1522  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1523  * fields corresponding to attributes that were used to store the verifier.
1524  * Make sure we clobber those fields in the later setattr call
1525  */
1526 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1527 {
1528         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1529             !(sattr->ia_valid & ATTR_ATIME_SET))
1530                 sattr->ia_valid |= ATTR_ATIME;
1531
1532         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1533             !(sattr->ia_valid & ATTR_MTIME_SET))
1534                 sattr->ia_valid |= ATTR_MTIME;
1535 }
1536
1537 /*
1538  * Returns a referenced nfs4_state
1539  */
1540 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)
1541 {
1542         struct nfs4_state_owner  *sp;
1543         struct nfs4_state     *state = NULL;
1544         struct nfs_server       *server = NFS_SERVER(dir);
1545         struct nfs4_opendata *opendata;
1546         int status;
1547
1548         /* Protect against reboot recovery conflicts */
1549         status = -ENOMEM;
1550         if (!(sp = nfs4_get_state_owner(server, cred))) {
1551                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1552                 goto out_err;
1553         }
1554         status = nfs4_recover_expired_lease(server);
1555         if (status != 0)
1556                 goto err_put_state_owner;
1557         if (path->dentry->d_inode != NULL)
1558                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1559         status = -ENOMEM;
1560         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1561         if (opendata == NULL)
1562                 goto err_put_state_owner;
1563
1564         if (path->dentry->d_inode != NULL)
1565                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1566
1567         status = _nfs4_proc_open(opendata);
1568         if (status != 0)
1569                 goto err_opendata_put;
1570
1571         if (opendata->o_arg.open_flags & O_EXCL)
1572                 nfs4_exclusive_attrset(opendata, sattr);
1573
1574         state = nfs4_opendata_to_nfs4_state(opendata);
1575         status = PTR_ERR(state);
1576         if (IS_ERR(state))
1577                 goto err_opendata_put;
1578         if (server->caps & NFS_CAP_POSIX_LOCK)
1579                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1580         nfs4_opendata_put(opendata);
1581         nfs4_put_state_owner(sp);
1582         *res = state;
1583         return 0;
1584 err_opendata_put:
1585         nfs4_opendata_put(opendata);
1586 err_put_state_owner:
1587         nfs4_put_state_owner(sp);
1588 out_err:
1589         *res = NULL;
1590         return status;
1591 }
1592
1593
1594 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)
1595 {
1596         struct nfs4_exception exception = { };
1597         struct nfs4_state *res;
1598         int status;
1599
1600         do {
1601                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1602                 if (status == 0)
1603                         break;
1604                 /* NOTE: BAD_SEQID means the server and client disagree about the
1605                  * book-keeping w.r.t. state-changing operations
1606                  * (OPEN/CLOSE/LOCK/LOCKU...)
1607                  * It is actually a sign of a bug on the client or on the server.
1608                  *
1609                  * If we receive a BAD_SEQID error in the particular case of
1610                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1611                  * have unhashed the old state_owner for us, and that we can
1612                  * therefore safely retry using a new one. We should still warn
1613                  * the user though...
1614                  */
1615                 if (status == -NFS4ERR_BAD_SEQID) {
1616                         printk(KERN_WARNING "NFS: v4 server %s "
1617                                         " returned a bad sequence-id error!\n",
1618                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1619                         exception.retry = 1;
1620                         continue;
1621                 }
1622                 /*
1623                  * BAD_STATEID on OPEN means that the server cancelled our
1624                  * state before it received the OPEN_CONFIRM.
1625                  * Recover by retrying the request as per the discussion
1626                  * on Page 181 of RFC3530.
1627                  */
1628                 if (status == -NFS4ERR_BAD_STATEID) {
1629                         exception.retry = 1;
1630                         continue;
1631                 }
1632                 if (status == -EAGAIN) {
1633                         /* We must have found a delegation */
1634                         exception.retry = 1;
1635                         continue;
1636                 }
1637                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1638                                         status, &exception));
1639         } while (exception.retry);
1640         return res;
1641 }
1642
1643 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1644                             struct nfs_fattr *fattr, struct iattr *sattr,
1645                             struct nfs4_state *state)
1646 {
1647         struct nfs_server *server = NFS_SERVER(inode);
1648         struct nfs_setattrargs  arg = {
1649                 .fh             = NFS_FH(inode),
1650                 .iap            = sattr,
1651                 .server         = server,
1652                 .bitmask = server->attr_bitmask,
1653         };
1654         struct nfs_setattrres  res = {
1655                 .fattr          = fattr,
1656                 .server         = server,
1657         };
1658         struct rpc_message msg = {
1659                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1660                 .rpc_argp       = &arg,
1661                 .rpc_resp       = &res,
1662                 .rpc_cred       = cred,
1663         };
1664         unsigned long timestamp = jiffies;
1665         int status;
1666
1667         nfs_fattr_init(fattr);
1668
1669         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1670                 /* Use that stateid */
1671         } else if (state != NULL) {
1672                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1673         } else
1674                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1675
1676         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1677         if (status == 0 && state != NULL)
1678                 renew_lease(server, timestamp);
1679         return status;
1680 }
1681
1682 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1683                            struct nfs_fattr *fattr, struct iattr *sattr,
1684                            struct nfs4_state *state)
1685 {
1686         struct nfs_server *server = NFS_SERVER(inode);
1687         struct nfs4_exception exception = { };
1688         int err;
1689         do {
1690                 err = nfs4_handle_exception(server,
1691                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1692                                 &exception);
1693         } while (exception.retry);
1694         return err;
1695 }
1696
1697 struct nfs4_closedata {
1698         struct path path;
1699         struct inode *inode;
1700         struct nfs4_state *state;
1701         struct nfs_closeargs arg;
1702         struct nfs_closeres res;
1703         struct nfs_fattr fattr;
1704         unsigned long timestamp;
1705 };
1706
1707 static void nfs4_free_closedata(void *data)
1708 {
1709         struct nfs4_closedata *calldata = data;
1710         struct nfs4_state_owner *sp = calldata->state->owner;
1711
1712         nfs4_put_open_state(calldata->state);
1713         nfs_free_seqid(calldata->arg.seqid);
1714         nfs4_put_state_owner(sp);
1715         path_put(&calldata->path);
1716         kfree(calldata);
1717 }
1718
1719 static void nfs4_close_done(struct rpc_task *task, void *data)
1720 {
1721         struct nfs4_closedata *calldata = data;
1722         struct nfs4_state *state = calldata->state;
1723         struct nfs_server *server = NFS_SERVER(calldata->inode);
1724
1725         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1726         if (RPC_ASSASSINATED(task))
1727                 return;
1728         /* hmm. we are done with the inode, and in the process of freeing
1729          * the state_owner. we keep this around to process errors
1730          */
1731         switch (task->tk_status) {
1732                 case 0:
1733                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1734                         renew_lease(server, calldata->timestamp);
1735                         break;
1736                 case -NFS4ERR_STALE_STATEID:
1737                 case -NFS4ERR_OLD_STATEID:
1738                 case -NFS4ERR_BAD_STATEID:
1739                 case -NFS4ERR_EXPIRED:
1740                         if (calldata->arg.fmode == 0)
1741                                 break;
1742                 default:
1743                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1744                                 nfs4_restart_rpc(task, server->nfs_client);
1745                                 return;
1746                         }
1747         }
1748         nfs4_sequence_free_slot(server->nfs_client, &calldata->res.seq_res);
1749         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1750 }
1751
1752 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1753 {
1754         struct nfs4_closedata *calldata = data;
1755         struct nfs4_state *state = calldata->state;
1756         int clear_rd, clear_wr, clear_rdwr;
1757
1758         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1759                 return;
1760
1761         clear_rd = clear_wr = clear_rdwr = 0;
1762         spin_lock(&state->owner->so_lock);
1763         /* Calculate the change in open mode */
1764         if (state->n_rdwr == 0) {
1765                 if (state->n_rdonly == 0) {
1766                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1767                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1768                 }
1769                 if (state->n_wronly == 0) {
1770                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1771                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1772                 }
1773         }
1774         spin_unlock(&state->owner->so_lock);
1775         if (!clear_rd && !clear_wr && !clear_rdwr) {
1776                 /* Note: exit _without_ calling nfs4_close_done */
1777                 task->tk_action = NULL;
1778                 return;
1779         }
1780         nfs_fattr_init(calldata->res.fattr);
1781         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1782                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1783                 calldata->arg.fmode = FMODE_READ;
1784         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1785                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1786                 calldata->arg.fmode = FMODE_WRITE;
1787         }
1788         calldata->timestamp = jiffies;
1789         if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1790                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1791                                 1, task))
1792                 return;
1793         rpc_call_start(task);
1794 }
1795
1796 static const struct rpc_call_ops nfs4_close_ops = {
1797         .rpc_call_prepare = nfs4_close_prepare,
1798         .rpc_call_done = nfs4_close_done,
1799         .rpc_release = nfs4_free_closedata,
1800 };
1801
1802 /*
1803  * It is possible for data to be read/written from a mem-mapped file
1804  * after the sys_close call (which hits the vfs layer as a flush).
1805  * This means that we can't safely call nfsv4 close on a file until
1806  * the inode is cleared. This in turn means that we are not good
1807  * NFSv4 citizens - we do not indicate to the server to update the file's
1808  * share state even when we are done with one of the three share
1809  * stateid's in the inode.
1810  *
1811  * NOTE: Caller must be holding the sp->so_owner semaphore!
1812  */
1813 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1814 {
1815         struct nfs_server *server = NFS_SERVER(state->inode);
1816         struct nfs4_closedata *calldata;
1817         struct nfs4_state_owner *sp = state->owner;
1818         struct rpc_task *task;
1819         struct rpc_message msg = {
1820                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1821                 .rpc_cred = state->owner->so_cred,
1822         };
1823         struct rpc_task_setup task_setup_data = {
1824                 .rpc_client = server->client,
1825                 .rpc_message = &msg,
1826                 .callback_ops = &nfs4_close_ops,
1827                 .workqueue = nfsiod_workqueue,
1828                 .flags = RPC_TASK_ASYNC,
1829         };
1830         int status = -ENOMEM;
1831
1832         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1833         if (calldata == NULL)
1834                 goto out;
1835         calldata->inode = state->inode;
1836         calldata->state = state;
1837         calldata->arg.fh = NFS_FH(state->inode);
1838         calldata->arg.stateid = &state->open_stateid;
1839         if (nfs4_has_session(server->nfs_client))
1840                 memset(calldata->arg.stateid->data, 0, 4);    /* clear seqid */
1841         /* Serialization for the sequence id */
1842         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1843         if (calldata->arg.seqid == NULL)
1844                 goto out_free_calldata;
1845         calldata->arg.fmode = 0;
1846         calldata->arg.bitmask = server->cache_consistency_bitmask;
1847         calldata->res.fattr = &calldata->fattr;
1848         calldata->res.seqid = calldata->arg.seqid;
1849         calldata->res.server = server;
1850         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1851         calldata->path.mnt = mntget(path->mnt);
1852         calldata->path.dentry = dget(path->dentry);
1853
1854         msg.rpc_argp = &calldata->arg,
1855         msg.rpc_resp = &calldata->res,
1856         task_setup_data.callback_data = calldata;
1857         task = rpc_run_task(&task_setup_data);
1858         if (IS_ERR(task))
1859                 return PTR_ERR(task);
1860         status = 0;
1861         if (wait)
1862                 status = rpc_wait_for_completion_task(task);
1863         rpc_put_task(task);
1864         return status;
1865 out_free_calldata:
1866         kfree(calldata);
1867 out:
1868         nfs4_put_open_state(state);
1869         nfs4_put_state_owner(sp);
1870         return status;
1871 }
1872
1873 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1874 {
1875         struct file *filp;
1876         int ret;
1877
1878         /* If the open_intent is for execute, we have an extra check to make */
1879         if (fmode & FMODE_EXEC) {
1880                 ret = nfs_may_open(state->inode,
1881                                 state->owner->so_cred,
1882                                 nd->intent.open.flags);
1883                 if (ret < 0)
1884                         goto out_close;
1885         }
1886         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1887         if (!IS_ERR(filp)) {
1888                 struct nfs_open_context *ctx;
1889                 ctx = nfs_file_open_context(filp);
1890                 ctx->state = state;
1891                 return 0;
1892         }
1893         ret = PTR_ERR(filp);
1894 out_close:
1895         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1896         return ret;
1897 }
1898
1899 struct dentry *
1900 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1901 {
1902         struct path path = {
1903                 .mnt = nd->path.mnt,
1904                 .dentry = dentry,
1905         };
1906         struct dentry *parent;
1907         struct iattr attr;
1908         struct rpc_cred *cred;
1909         struct nfs4_state *state;
1910         struct dentry *res;
1911         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1912
1913         if (nd->flags & LOOKUP_CREATE) {
1914                 attr.ia_mode = nd->intent.open.create_mode;
1915                 attr.ia_valid = ATTR_MODE;
1916                 if (!IS_POSIXACL(dir))
1917                         attr.ia_mode &= ~current_umask();
1918         } else {
1919                 attr.ia_valid = 0;
1920                 BUG_ON(nd->intent.open.flags & O_CREAT);
1921         }
1922
1923         cred = rpc_lookup_cred();
1924         if (IS_ERR(cred))
1925                 return (struct dentry *)cred;
1926         parent = dentry->d_parent;
1927         /* Protect against concurrent sillydeletes */
1928         nfs_block_sillyrename(parent);
1929         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1930         put_rpccred(cred);
1931         if (IS_ERR(state)) {
1932                 if (PTR_ERR(state) == -ENOENT) {
1933                         d_add(dentry, NULL);
1934                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1935                 }
1936                 nfs_unblock_sillyrename(parent);
1937                 return (struct dentry *)state;
1938         }
1939         res = d_add_unique(dentry, igrab(state->inode));
1940         if (res != NULL)
1941                 path.dentry = res;
1942         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1943         nfs_unblock_sillyrename(parent);
1944         nfs4_intent_set_file(nd, &path, state, fmode);
1945         return res;
1946 }
1947
1948 int
1949 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1950 {
1951         struct path path = {
1952                 .mnt = nd->path.mnt,
1953                 .dentry = dentry,
1954         };
1955         struct rpc_cred *cred;
1956         struct nfs4_state *state;
1957         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1958
1959         cred = rpc_lookup_cred();
1960         if (IS_ERR(cred))
1961                 return PTR_ERR(cred);
1962         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1963         put_rpccred(cred);
1964         if (IS_ERR(state)) {
1965                 switch (PTR_ERR(state)) {
1966                         case -EPERM:
1967                         case -EACCES:
1968                         case -EDQUOT:
1969                         case -ENOSPC:
1970                         case -EROFS:
1971                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1972                                 return 1;
1973                         default:
1974                                 goto out_drop;
1975                 }
1976         }
1977         if (state->inode == dentry->d_inode) {
1978                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1979                 nfs4_intent_set_file(nd, &path, state, fmode);
1980                 return 1;
1981         }
1982         nfs4_close_sync(&path, state, fmode);
1983 out_drop:
1984         d_drop(dentry);
1985         return 0;
1986 }
1987
1988 void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1989 {
1990         if (ctx->state == NULL)
1991                 return;
1992         if (is_sync)
1993                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
1994         else
1995                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
1996 }
1997
1998 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1999 {
2000         struct nfs4_server_caps_arg args = {
2001                 .fhandle = fhandle,
2002         };
2003         struct nfs4_server_caps_res res = {};
2004         struct rpc_message msg = {
2005                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2006                 .rpc_argp = &args,
2007                 .rpc_resp = &res,
2008         };
2009         int status;
2010
2011         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2012         if (status == 0) {
2013                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2014                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2015                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2016                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2017                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2018                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2019                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2020                         server->caps |= NFS_CAP_ACLS;
2021                 if (res.has_links != 0)
2022                         server->caps |= NFS_CAP_HARDLINKS;
2023                 if (res.has_symlinks != 0)
2024                         server->caps |= NFS_CAP_SYMLINKS;
2025                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2026                         server->caps |= NFS_CAP_FILEID;
2027                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2028                         server->caps |= NFS_CAP_MODE;
2029                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2030                         server->caps |= NFS_CAP_NLINK;
2031                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2032                         server->caps |= NFS_CAP_OWNER;
2033                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2034                         server->caps |= NFS_CAP_OWNER_GROUP;
2035                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2036                         server->caps |= NFS_CAP_ATIME;
2037                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2038                         server->caps |= NFS_CAP_CTIME;
2039                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2040                         server->caps |= NFS_CAP_MTIME;
2041
2042                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2043                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2044                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2045                 server->acl_bitmask = res.acl_bitmask;
2046         }
2047
2048         return status;
2049 }
2050
2051 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2052 {
2053         struct nfs4_exception exception = { };
2054         int err;
2055         do {
2056                 err = nfs4_handle_exception(server,
2057                                 _nfs4_server_capabilities(server, fhandle),
2058                                 &exception);
2059         } while (exception.retry);
2060         return err;
2061 }
2062
2063 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2064                 struct nfs_fsinfo *info)
2065 {
2066         struct nfs4_lookup_root_arg args = {
2067                 .bitmask = nfs4_fattr_bitmap,
2068         };
2069         struct nfs4_lookup_res res = {
2070                 .server = server,
2071                 .fattr = info->fattr,
2072                 .fh = fhandle,
2073         };
2074         struct rpc_message msg = {
2075                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2076                 .rpc_argp = &args,
2077                 .rpc_resp = &res,
2078         };
2079
2080         nfs_fattr_init(info->fattr);
2081         return nfs4_call_sync(server, &msg, &args, &res, 0);
2082 }
2083
2084 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2085                 struct nfs_fsinfo *info)
2086 {
2087         struct nfs4_exception exception = { };
2088         int err;
2089         do {
2090                 err = nfs4_handle_exception(server,
2091                                 _nfs4_lookup_root(server, fhandle, info),
2092                                 &exception);
2093         } while (exception.retry);
2094         return err;
2095 }
2096
2097 /*
2098  * get the file handle for the "/" directory on the server
2099  */
2100 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2101                               struct nfs_fsinfo *info)
2102 {
2103         int status;
2104
2105         status = nfs4_lookup_root(server, fhandle, info);
2106         if (status == 0)
2107                 status = nfs4_server_capabilities(server, fhandle);
2108         if (status == 0)
2109                 status = nfs4_do_fsinfo(server, fhandle, info);
2110         return nfs4_map_errors(status);
2111 }
2112
2113 /*
2114  * Get locations and (maybe) other attributes of a referral.
2115  * Note that we'll actually follow the referral later when
2116  * we detect fsid mismatch in inode revalidation
2117  */
2118 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2119 {
2120         int status = -ENOMEM;
2121         struct page *page = NULL;
2122         struct nfs4_fs_locations *locations = NULL;
2123
2124         page = alloc_page(GFP_KERNEL);
2125         if (page == NULL)
2126                 goto out;
2127         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2128         if (locations == NULL)
2129                 goto out;
2130
2131         status = nfs4_proc_fs_locations(dir, name, locations, page);
2132         if (status != 0)
2133                 goto out;
2134         /* Make sure server returned a different fsid for the referral */
2135         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2136                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2137                 status = -EIO;
2138                 goto out;
2139         }
2140
2141         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2142         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2143         if (!fattr->mode)
2144                 fattr->mode = S_IFDIR;
2145         memset(fhandle, 0, sizeof(struct nfs_fh));
2146 out:
2147         if (page)
2148                 __free_page(page);
2149         if (locations)
2150                 kfree(locations);
2151         return status;
2152 }
2153
2154 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2155 {
2156         struct nfs4_getattr_arg args = {
2157                 .fh = fhandle,
2158                 .bitmask = server->attr_bitmask,
2159         };
2160         struct nfs4_getattr_res res = {
2161                 .fattr = fattr,
2162                 .server = server,
2163         };
2164         struct rpc_message msg = {
2165                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2166                 .rpc_argp = &args,
2167                 .rpc_resp = &res,
2168         };
2169
2170         nfs_fattr_init(fattr);
2171         return nfs4_call_sync(server, &msg, &args, &res, 0);
2172 }
2173
2174 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2175 {
2176         struct nfs4_exception exception = { };
2177         int err;
2178         do {
2179                 err = nfs4_handle_exception(server,
2180                                 _nfs4_proc_getattr(server, fhandle, fattr),
2181                                 &exception);
2182         } while (exception.retry);
2183         return err;
2184 }
2185
2186 /*
2187  * The file is not closed if it is opened due to the a request to change
2188  * the size of the file. The open call will not be needed once the
2189  * VFS layer lookup-intents are implemented.
2190  *
2191  * Close is called when the inode is destroyed.
2192  * If we haven't opened the file for O_WRONLY, we
2193  * need to in the size_change case to obtain a stateid.
2194  *
2195  * Got race?
2196  * Because OPEN is always done by name in nfsv4, it is
2197  * possible that we opened a different file by the same
2198  * name.  We can recognize this race condition, but we
2199  * can't do anything about it besides returning an error.
2200  *
2201  * This will be fixed with VFS changes (lookup-intent).
2202  */
2203 static int
2204 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2205                   struct iattr *sattr)
2206 {
2207         struct inode *inode = dentry->d_inode;
2208         struct rpc_cred *cred = NULL;
2209         struct nfs4_state *state = NULL;
2210         int status;
2211
2212         nfs_fattr_init(fattr);
2213
2214         /* Search for an existing open(O_WRITE) file */
2215         if (sattr->ia_valid & ATTR_FILE) {
2216                 struct nfs_open_context *ctx;
2217
2218                 ctx = nfs_file_open_context(sattr->ia_file);
2219                 if (ctx) {
2220                         cred = ctx->cred;
2221                         state = ctx->state;
2222                 }
2223         }
2224
2225         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2226         if (status == 0)
2227                 nfs_setattr_update_inode(inode, sattr);
2228         return status;
2229 }
2230
2231 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2232                 const struct qstr *name, struct nfs_fh *fhandle,
2233                 struct nfs_fattr *fattr)
2234 {
2235         int                    status;
2236         struct nfs4_lookup_arg args = {
2237                 .bitmask = server->attr_bitmask,
2238                 .dir_fh = dirfh,
2239                 .name = name,
2240         };
2241         struct nfs4_lookup_res res = {
2242                 .server = server,
2243                 .fattr = fattr,
2244                 .fh = fhandle,
2245         };
2246         struct rpc_message msg = {
2247                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2248                 .rpc_argp = &args,
2249                 .rpc_resp = &res,
2250         };
2251
2252         nfs_fattr_init(fattr);
2253
2254         dprintk("NFS call  lookupfh %s\n", name->name);
2255         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2256         dprintk("NFS reply lookupfh: %d\n", status);
2257         return status;
2258 }
2259
2260 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2261                               struct qstr *name, struct nfs_fh *fhandle,
2262                               struct nfs_fattr *fattr)
2263 {
2264         struct nfs4_exception exception = { };
2265         int err;
2266         do {
2267                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2268                 /* FIXME: !!!! */
2269                 if (err == -NFS4ERR_MOVED) {
2270                         err = -EREMOTE;
2271                         break;
2272                 }
2273                 err = nfs4_handle_exception(server, err, &exception);
2274         } while (exception.retry);
2275         return err;
2276 }
2277
2278 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2279                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2280 {
2281         int status;
2282
2283         dprintk("NFS call  lookup %s\n", name->name);
2284         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2285         if (status == -NFS4ERR_MOVED)
2286                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2287         dprintk("NFS reply lookup: %d\n", status);
2288         return status;
2289 }
2290
2291 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2292 {
2293         struct nfs4_exception exception = { };
2294         int err;
2295         do {
2296                 err = nfs4_handle_exception(NFS_SERVER(dir),
2297                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2298                                 &exception);
2299         } while (exception.retry);
2300         return err;
2301 }
2302
2303 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2304 {
2305         struct nfs_server *server = NFS_SERVER(inode);
2306         struct nfs_fattr fattr;
2307         struct nfs4_accessargs args = {
2308                 .fh = NFS_FH(inode),
2309                 .bitmask = server->attr_bitmask,
2310         };
2311         struct nfs4_accessres res = {
2312                 .server = server,
2313                 .fattr = &fattr,
2314         };
2315         struct rpc_message msg = {
2316                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2317                 .rpc_argp = &args,
2318                 .rpc_resp = &res,
2319                 .rpc_cred = entry->cred,
2320         };
2321         int mode = entry->mask;
2322         int status;
2323
2324         /*
2325          * Determine which access bits we want to ask for...
2326          */
2327         if (mode & MAY_READ)
2328                 args.access |= NFS4_ACCESS_READ;
2329         if (S_ISDIR(inode->i_mode)) {
2330                 if (mode & MAY_WRITE)
2331                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2332                 if (mode & MAY_EXEC)
2333                         args.access |= NFS4_ACCESS_LOOKUP;
2334         } else {
2335                 if (mode & MAY_WRITE)
2336                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2337                 if (mode & MAY_EXEC)
2338                         args.access |= NFS4_ACCESS_EXECUTE;
2339         }
2340         nfs_fattr_init(&fattr);
2341         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2342         if (!status) {
2343                 entry->mask = 0;
2344                 if (res.access & NFS4_ACCESS_READ)
2345                         entry->mask |= MAY_READ;
2346                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2347                         entry->mask |= MAY_WRITE;
2348                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2349                         entry->mask |= MAY_EXEC;
2350                 nfs_refresh_inode(inode, &fattr);
2351         }
2352         return status;
2353 }
2354
2355 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2356 {
2357         struct nfs4_exception exception = { };
2358         int err;
2359         do {
2360                 err = nfs4_handle_exception(NFS_SERVER(inode),
2361                                 _nfs4_proc_access(inode, entry),
2362                                 &exception);
2363         } while (exception.retry);
2364         return err;
2365 }
2366
2367 /*
2368  * TODO: For the time being, we don't try to get any attributes
2369  * along with any of the zero-copy operations READ, READDIR,
2370  * READLINK, WRITE.
2371  *
2372  * In the case of the first three, we want to put the GETATTR
2373  * after the read-type operation -- this is because it is hard
2374  * to predict the length of a GETATTR response in v4, and thus
2375  * align the READ data correctly.  This means that the GETATTR
2376  * may end up partially falling into the page cache, and we should
2377  * shift it into the 'tail' of the xdr_buf before processing.
2378  * To do this efficiently, we need to know the total length
2379  * of data received, which doesn't seem to be available outside
2380  * of the RPC layer.
2381  *
2382  * In the case of WRITE, we also want to put the GETATTR after
2383  * the operation -- in this case because we want to make sure
2384  * we get the post-operation mtime and size.  This means that
2385  * we can't use xdr_encode_pages() as written: we need a variant
2386  * of it which would leave room in the 'tail' iovec.
2387  *
2388  * Both of these changes to the XDR layer would in fact be quite
2389  * minor, but I decided to leave them for a subsequent patch.
2390  */
2391 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2392                 unsigned int pgbase, unsigned int pglen)
2393 {
2394         struct nfs4_readlink args = {
2395                 .fh       = NFS_FH(inode),
2396                 .pgbase   = pgbase,
2397                 .pglen    = pglen,
2398                 .pages    = &page,
2399         };
2400         struct nfs4_readlink_res res;
2401         struct rpc_message msg = {
2402                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2403                 .rpc_argp = &args,
2404                 .rpc_resp = &res,
2405         };
2406
2407         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2408 }
2409
2410 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2411                 unsigned int pgbase, unsigned int pglen)
2412 {
2413         struct nfs4_exception exception = { };
2414         int err;
2415         do {
2416                 err = nfs4_handle_exception(NFS_SERVER(inode),
2417                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2418                                 &exception);
2419         } while (exception.retry);
2420         return err;
2421 }
2422
2423 /*
2424  * Got race?
2425  * We will need to arrange for the VFS layer to provide an atomic open.
2426  * Until then, this create/open method is prone to inefficiency and race
2427  * conditions due to the lookup, create, and open VFS calls from sys_open()
2428  * placed on the wire.
2429  *
2430  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2431  * The file will be opened again in the subsequent VFS open call
2432  * (nfs4_proc_file_open).
2433  *
2434  * The open for read will just hang around to be used by any process that
2435  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2436  */
2437
2438 static int
2439 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2440                  int flags, struct nameidata *nd)
2441 {
2442         struct path path = {
2443                 .mnt = nd->path.mnt,
2444                 .dentry = dentry,
2445         };
2446         struct nfs4_state *state;
2447         struct rpc_cred *cred;
2448         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2449         int status = 0;
2450
2451         cred = rpc_lookup_cred();
2452         if (IS_ERR(cred)) {
2453                 status = PTR_ERR(cred);
2454                 goto out;
2455         }
2456         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2457         d_drop(dentry);
2458         if (IS_ERR(state)) {
2459                 status = PTR_ERR(state);
2460                 goto out_putcred;
2461         }
2462         d_add(dentry, igrab(state->inode));
2463         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2464         if (flags & O_EXCL) {
2465                 struct nfs_fattr fattr;
2466                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2467                 if (status == 0)
2468                         nfs_setattr_update_inode(state->inode, sattr);
2469                 nfs_post_op_update_inode(state->inode, &fattr);
2470         }
2471         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2472                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2473         else
2474                 nfs4_close_sync(&path, state, fmode);
2475 out_putcred:
2476         put_rpccred(cred);
2477 out:
2478         return status;
2479 }
2480
2481 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2482 {
2483         struct nfs_server *server = NFS_SERVER(dir);
2484         struct nfs_removeargs args = {
2485                 .fh = NFS_FH(dir),
2486                 .name.len = name->len,
2487                 .name.name = name->name,
2488                 .bitmask = server->attr_bitmask,
2489         };
2490         struct nfs_removeres res = {
2491                 .server = server,
2492         };
2493         struct rpc_message msg = {
2494                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2495                 .rpc_argp = &args,
2496                 .rpc_resp = &res,
2497         };
2498         int                     status;
2499
2500         nfs_fattr_init(&res.dir_attr);
2501         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2502         if (status == 0) {
2503                 update_changeattr(dir, &res.cinfo);
2504                 nfs_post_op_update_inode(dir, &res.dir_attr);
2505         }
2506         return status;
2507 }
2508
2509 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2510 {
2511         struct nfs4_exception exception = { };
2512         int err;
2513         do {
2514                 err = nfs4_handle_exception(NFS_SERVER(dir),
2515                                 _nfs4_proc_remove(dir, name),
2516                                 &exception);
2517         } while (exception.retry);
2518         return err;
2519 }
2520
2521 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2522 {
2523         struct nfs_server *server = NFS_SERVER(dir);
2524         struct nfs_removeargs *args = msg->rpc_argp;
2525         struct nfs_removeres *res = msg->rpc_resp;
2526
2527         args->bitmask = server->cache_consistency_bitmask;
2528         res->server = server;
2529         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2530 }
2531
2532 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2533 {
2534         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2535
2536         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2537         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2538                 return 0;
2539         nfs4_sequence_free_slot(res->server->nfs_client, &res->seq_res);
2540         update_changeattr(dir, &res->cinfo);
2541         nfs_post_op_update_inode(dir, &res->dir_attr);
2542         return 1;
2543 }
2544
2545 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2546                 struct inode *new_dir, struct qstr *new_name)
2547 {
2548         struct nfs_server *server = NFS_SERVER(old_dir);
2549         struct nfs4_rename_arg arg = {
2550                 .old_dir = NFS_FH(old_dir),
2551                 .new_dir = NFS_FH(new_dir),
2552                 .old_name = old_name,
2553                 .new_name = new_name,
2554                 .bitmask = server->attr_bitmask,
2555         };
2556         struct nfs_fattr old_fattr, new_fattr;
2557         struct nfs4_rename_res res = {
2558                 .server = server,
2559                 .old_fattr = &old_fattr,
2560                 .new_fattr = &new_fattr,
2561         };
2562         struct rpc_message msg = {
2563                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2564                 .rpc_argp = &arg,
2565                 .rpc_resp = &res,
2566         };
2567         int                     status;
2568
2569         nfs_fattr_init(res.old_fattr);
2570         nfs_fattr_init(res.new_fattr);
2571         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2572
2573         if (!status) {
2574                 update_changeattr(old_dir, &res.old_cinfo);
2575                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2576                 update_changeattr(new_dir, &res.new_cinfo);
2577                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2578         }
2579         return status;
2580 }
2581
2582 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2583                 struct inode *new_dir, struct qstr *new_name)
2584 {
2585         struct nfs4_exception exception = { };
2586         int err;
2587         do {
2588                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2589                                 _nfs4_proc_rename(old_dir, old_name,
2590                                         new_dir, new_name),
2591                                 &exception);
2592         } while (exception.retry);
2593         return err;
2594 }
2595
2596 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2597 {
2598         struct nfs_server *server = NFS_SERVER(inode);
2599         struct nfs4_link_arg arg = {
2600                 .fh     = NFS_FH(inode),
2601                 .dir_fh = NFS_FH(dir),
2602                 .name   = name,
2603                 .bitmask = server->attr_bitmask,
2604         };
2605         struct nfs_fattr fattr, dir_attr;
2606         struct nfs4_link_res res = {
2607                 .server = server,
2608                 .fattr = &fattr,
2609                 .dir_attr = &dir_attr,
2610         };
2611         struct rpc_message msg = {
2612                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2613                 .rpc_argp = &arg,
2614                 .rpc_resp = &res,
2615         };
2616         int                     status;
2617
2618         nfs_fattr_init(res.fattr);
2619         nfs_fattr_init(res.dir_attr);
2620         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2621         if (!status) {
2622                 update_changeattr(dir, &res.cinfo);
2623                 nfs_post_op_update_inode(dir, res.dir_attr);
2624                 nfs_post_op_update_inode(inode, res.fattr);
2625         }
2626
2627         return status;
2628 }
2629
2630 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2631 {
2632         struct nfs4_exception exception = { };
2633         int err;
2634         do {
2635                 err = nfs4_handle_exception(NFS_SERVER(inode),
2636                                 _nfs4_proc_link(inode, dir, name),
2637                                 &exception);
2638         } while (exception.retry);
2639         return err;
2640 }
2641
2642 struct nfs4_createdata {
2643         struct rpc_message msg;
2644         struct nfs4_create_arg arg;
2645         struct nfs4_create_res res;
2646         struct nfs_fh fh;
2647         struct nfs_fattr fattr;
2648         struct nfs_fattr dir_fattr;
2649 };
2650
2651 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2652                 struct qstr *name, struct iattr *sattr, u32 ftype)
2653 {
2654         struct nfs4_createdata *data;
2655
2656         data = kzalloc(sizeof(*data), GFP_KERNEL);
2657         if (data != NULL) {
2658                 struct nfs_server *server = NFS_SERVER(dir);
2659
2660                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2661                 data->msg.rpc_argp = &data->arg;
2662                 data->msg.rpc_resp = &data->res;
2663                 data->arg.dir_fh = NFS_FH(dir);
2664                 data->arg.server = server;
2665                 data->arg.name = name;
2666                 data->arg.attrs = sattr;
2667                 data->arg.ftype = ftype;
2668                 data->arg.bitmask = server->attr_bitmask;
2669                 data->res.server = server;
2670                 data->res.fh = &data->fh;
2671                 data->res.fattr = &data->fattr;
2672                 data->res.dir_fattr = &data->dir_fattr;
2673                 nfs_fattr_init(data->res.fattr);
2674                 nfs_fattr_init(data->res.dir_fattr);
2675         }
2676         return data;
2677 }
2678
2679 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2680 {
2681         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2682                                     &data->arg, &data->res, 1);
2683         if (status == 0) {
2684                 update_changeattr(dir, &data->res.dir_cinfo);
2685                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2686                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2687         }
2688         return status;
2689 }
2690
2691 static void nfs4_free_createdata(struct nfs4_createdata *data)
2692 {
2693         kfree(data);
2694 }
2695
2696 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2697                 struct page *page, unsigned int len, struct iattr *sattr)
2698 {
2699         struct nfs4_createdata *data;
2700         int status = -ENAMETOOLONG;
2701
2702         if (len > NFS4_MAXPATHLEN)
2703                 goto out;
2704
2705         status = -ENOMEM;
2706         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2707         if (data == NULL)
2708                 goto out;
2709
2710         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2711         data->arg.u.symlink.pages = &page;
2712         data->arg.u.symlink.len = len;
2713
2714         status = nfs4_do_create(dir, dentry, data);
2715
2716         nfs4_free_createdata(data);
2717 out:
2718         return status;
2719 }
2720
2721 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2722                 struct page *page, unsigned int len, struct iattr *sattr)
2723 {
2724         struct nfs4_exception exception = { };
2725         int err;
2726         do {
2727                 err = nfs4_handle_exception(NFS_SERVER(dir),
2728                                 _nfs4_proc_symlink(dir, dentry, page,
2729                                                         len, sattr),
2730                                 &exception);
2731         } while (exception.retry);
2732         return err;
2733 }
2734
2735 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2736                 struct iattr *sattr)
2737 {
2738         struct nfs4_createdata *data;
2739         int status = -ENOMEM;
2740
2741         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2742         if (data == NULL)
2743                 goto out;
2744
2745         status = nfs4_do_create(dir, dentry, data);
2746
2747         nfs4_free_createdata(data);
2748 out:
2749         return status;
2750 }
2751
2752 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2753                 struct iattr *sattr)
2754 {
2755         struct nfs4_exception exception = { };
2756         int err;
2757         do {
2758                 err = nfs4_handle_exception(NFS_SERVER(dir),
2759                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2760                                 &exception);
2761         } while (exception.retry);
2762         return err;
2763 }
2764
2765 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2766                   u64 cookie, struct page *page, unsigned int count, int plus)
2767 {
2768         struct inode            *dir = dentry->d_inode;
2769         struct nfs4_readdir_arg args = {
2770                 .fh = NFS_FH(dir),
2771                 .pages = &page,
2772                 .pgbase = 0,
2773                 .count = count,
2774                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2775         };
2776         struct nfs4_readdir_res res;
2777         struct rpc_message msg = {
2778                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2779                 .rpc_argp = &args,
2780                 .rpc_resp = &res,
2781                 .rpc_cred = cred,
2782         };
2783         int                     status;
2784
2785         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2786                         dentry->d_parent->d_name.name,
2787                         dentry->d_name.name,
2788                         (unsigned long long)cookie);
2789         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2790         res.pgbase = args.pgbase;
2791         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2792         if (status == 0)
2793                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2794
2795         nfs_invalidate_atime(dir);
2796
2797         dprintk("%s: returns %d\n", __func__, status);
2798         return status;
2799 }
2800
2801 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2802                   u64 cookie, struct page *page, unsigned int count, int plus)
2803 {
2804         struct nfs4_exception exception = { };
2805         int err;
2806         do {
2807                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2808                                 _nfs4_proc_readdir(dentry, cred, cookie,
2809                                         page, count, plus),
2810                                 &exception);
2811         } while (exception.retry);
2812         return err;
2813 }
2814
2815 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2816                 struct iattr *sattr, dev_t rdev)
2817 {
2818         struct nfs4_createdata *data;
2819         int mode = sattr->ia_mode;
2820         int status = -ENOMEM;
2821
2822         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2823         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2824
2825         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2826         if (data == NULL)
2827                 goto out;
2828
2829         if (S_ISFIFO(mode))
2830                 data->arg.ftype = NF4FIFO;
2831         else if (S_ISBLK(mode)) {
2832                 data->arg.ftype = NF4BLK;
2833                 data->arg.u.device.specdata1 = MAJOR(rdev);
2834                 data->arg.u.device.specdata2 = MINOR(rdev);
2835         }
2836         else if (S_ISCHR(mode)) {
2837                 data->arg.ftype = NF4CHR;
2838                 data->arg.u.device.specdata1 = MAJOR(rdev);
2839                 data->arg.u.device.specdata2 = MINOR(rdev);
2840         }
2841
2842         status = nfs4_do_create(dir, dentry, data);
2843
2844         nfs4_free_createdata(data);
2845 out:
2846         return status;
2847 }
2848
2849 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2850                 struct iattr *sattr, dev_t rdev)
2851 {
2852         struct nfs4_exception exception = { };
2853         int err;
2854         do {
2855                 err = nfs4_handle_exception(NFS_SERVER(dir),
2856                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2857                                 &exception);
2858         } while (exception.retry);
2859         return err;
2860 }
2861
2862 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2863                  struct nfs_fsstat *fsstat)
2864 {
2865         struct nfs4_statfs_arg args = {
2866                 .fh = fhandle,
2867                 .bitmask = server->attr_bitmask,
2868         };
2869         struct nfs4_statfs_res res = {
2870                 .fsstat = fsstat,
2871         };
2872         struct rpc_message msg = {
2873                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2874                 .rpc_argp = &args,
2875                 .rpc_resp = &res,
2876         };
2877
2878         nfs_fattr_init(fsstat->fattr);
2879         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2880 }
2881
2882 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2883 {
2884         struct nfs4_exception exception = { };
2885         int err;
2886         do {
2887                 err = nfs4_handle_exception(server,
2888                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2889                                 &exception);
2890         } while (exception.retry);
2891         return err;
2892 }
2893
2894 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2895                 struct nfs_fsinfo *fsinfo)
2896 {
2897         struct nfs4_fsinfo_arg args = {
2898                 .fh = fhandle,
2899                 .bitmask = server->attr_bitmask,
2900         };
2901         struct nfs4_fsinfo_res res = {
2902                 .fsinfo = fsinfo,
2903         };
2904         struct rpc_message msg = {
2905                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2906                 .rpc_argp = &args,
2907                 .rpc_resp = &res,
2908         };
2909
2910         return nfs4_call_sync(server, &msg, &args, &res, 0);
2911 }
2912
2913 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2914 {
2915         struct nfs4_exception exception = { };
2916         int err;
2917
2918         do {
2919                 err = nfs4_handle_exception(server,
2920                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2921                                 &exception);
2922         } while (exception.retry);
2923         return err;
2924 }
2925
2926 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2927 {
2928         nfs_fattr_init(fsinfo->fattr);
2929         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2930 }
2931
2932 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2933                 struct nfs_pathconf *pathconf)
2934 {
2935         struct nfs4_pathconf_arg args = {
2936                 .fh = fhandle,
2937                 .bitmask = server->attr_bitmask,
2938         };
2939         struct nfs4_pathconf_res res = {
2940                 .pathconf = pathconf,
2941         };
2942         struct rpc_message msg = {
2943                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2944                 .rpc_argp = &args,
2945                 .rpc_resp = &res,
2946         };
2947
2948         /* None of the pathconf attributes are mandatory to implement */
2949         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2950                 memset(pathconf, 0, sizeof(*pathconf));
2951                 return 0;
2952         }
2953
2954         nfs_fattr_init(pathconf->fattr);
2955         return nfs4_call_sync(server, &msg, &args, &res, 0);
2956 }
2957
2958 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2959                 struct nfs_pathconf *pathconf)
2960 {
2961         struct nfs4_exception exception = { };
2962         int err;
2963
2964         do {
2965                 err = nfs4_handle_exception(server,
2966                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2967                                 &exception);
2968         } while (exception.retry);
2969         return err;
2970 }
2971
2972 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2973 {
2974         struct nfs_server *server = NFS_SERVER(data->inode);
2975
2976         dprintk("--> %s\n", __func__);
2977
2978         /* nfs4_sequence_free_slot called in the read rpc_call_done */
2979         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
2980
2981         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2982                 nfs4_restart_rpc(task, server->nfs_client);
2983                 return -EAGAIN;
2984         }
2985
2986         nfs_invalidate_atime(data->inode);
2987         if (task->tk_status > 0)
2988                 renew_lease(server, data->timestamp);
2989         return 0;
2990 }
2991
2992 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2993 {
2994         data->timestamp   = jiffies;
2995         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2996 }
2997
2998 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2999 {
3000         struct inode *inode = data->inode;
3001
3002         /* slot is freed in nfs_writeback_done */
3003         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3004                            task->tk_status);
3005
3006         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3007                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3008                 return -EAGAIN;
3009         }
3010         if (task->tk_status >= 0) {
3011                 renew_lease(NFS_SERVER(inode), data->timestamp);
3012                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3013         }
3014         return 0;
3015 }
3016
3017 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3018 {
3019         struct nfs_server *server = NFS_SERVER(data->inode);
3020
3021         data->args.bitmask = server->cache_consistency_bitmask;
3022         data->res.server = server;
3023         data->timestamp   = jiffies;
3024
3025         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3026 }
3027
3028 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3029 {
3030         struct inode *inode = data->inode;
3031
3032         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3033                            task->tk_status);
3034         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3035                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3036                 return -EAGAIN;
3037         }
3038         nfs4_sequence_free_slot(NFS_SERVER(inode)->nfs_client,
3039                                 &data->res.seq_res);
3040         nfs_refresh_inode(inode, data->res.fattr);
3041         return 0;
3042 }
3043
3044 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3045 {
3046         struct nfs_server *server = NFS_SERVER(data->inode);
3047
3048         data->args.bitmask = server->cache_consistency_bitmask;
3049         data->res.server = server;
3050         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3051 }
3052
3053 /*
3054  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3055  * standalone procedure for queueing an asynchronous RENEW.
3056  */
3057 static void nfs4_renew_done(struct rpc_task *task, void *data)
3058 {
3059         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
3060         unsigned long timestamp = (unsigned long)data;
3061
3062         if (task->tk_status < 0) {
3063                 /* Unless we're shutting down, schedule state recovery! */
3064                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3065                         nfs4_schedule_state_recovery(clp);
3066                 return;
3067         }
3068         spin_lock(&clp->cl_lock);
3069         if (time_before(clp->cl_last_renewal,timestamp))
3070                 clp->cl_last_renewal = timestamp;
3071         spin_unlock(&clp->cl_lock);
3072 }
3073
3074 static const struct rpc_call_ops nfs4_renew_ops = {
3075         .rpc_call_done = nfs4_renew_done,
3076 };
3077
3078 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3079 {
3080         struct rpc_message msg = {
3081                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3082                 .rpc_argp       = clp,
3083                 .rpc_cred       = cred,
3084         };
3085
3086         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3087                         &nfs4_renew_ops, (void *)jiffies);
3088 }
3089
3090 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3091 {
3092         struct rpc_message msg = {
3093                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3094                 .rpc_argp       = clp,
3095                 .rpc_cred       = cred,
3096         };
3097         unsigned long now = jiffies;
3098         int status;
3099
3100         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3101         if (status < 0)
3102                 return status;
3103         spin_lock(&clp->cl_lock);
3104         if (time_before(clp->cl_last_renewal,now))
3105                 clp->cl_last_renewal = now;
3106         spin_unlock(&clp->cl_lock);
3107         return 0;
3108 }
3109
3110 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3111 {
3112         return (server->caps & NFS_CAP_ACLS)
3113                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3114                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3115 }
3116
3117 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3118  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3119  * the stack.
3120  */
3121 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3122
3123 static void buf_to_pages(const void *buf, size_t buflen,
3124                 struct page **pages, unsigned int *pgbase)
3125 {
3126         const void *p = buf;
3127
3128         *pgbase = offset_in_page(buf);
3129         p -= *pgbase;
3130         while (p < buf + buflen) {
3131                 *(pages++) = virt_to_page(p);
3132                 p += PAGE_CACHE_SIZE;
3133         }
3134 }
3135
3136 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3137                 struct page **pages, unsigned int *pgbase)
3138 {
3139         struct page *newpage, **spages;
3140         int rc = 0;
3141         size_t len;
3142         spages = pages;
3143
3144         do {
3145                 len = min_t(size_t, PAGE_CACHE_SIZE, buflen);
3146                 newpage = alloc_page(GFP_KERNEL);
3147
3148                 if (newpage == NULL)
3149                         goto unwind;
3150                 memcpy(page_address(newpage), buf, len);
3151                 buf += len;
3152                 buflen -= len;
3153                 *pages++ = newpage;
3154                 rc++;
3155         } while (buflen != 0);
3156
3157         return rc;
3158
3159 unwind:
3160         for(; rc > 0; rc--)
3161                 __free_page(spages[rc-1]);
3162         return -ENOMEM;
3163 }
3164
3165 struct nfs4_cached_acl {
3166         int cached;
3167         size_t len;
3168         char data[0];
3169 };
3170
3171 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3172 {
3173         struct nfs_inode *nfsi = NFS_I(inode);
3174
3175         spin_lock(&inode->i_lock);
3176         kfree(nfsi->nfs4_acl);
3177         nfsi->nfs4_acl = acl;
3178         spin_unlock(&inode->i_lock);
3179 }
3180
3181 static void nfs4_zap_acl_attr(struct inode *inode)
3182 {
3183         nfs4_set_cached_acl(inode, NULL);
3184 }
3185
3186 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3187 {
3188         struct nfs_inode *nfsi = NFS_I(inode);
3189         struct nfs4_cached_acl *acl;
3190         int ret = -ENOENT;
3191
3192         spin_lock(&inode->i_lock);
3193         acl = nfsi->nfs4_acl;
3194         if (acl == NULL)
3195                 goto out;
3196         if (buf == NULL) /* user is just asking for length */
3197                 goto out_len;
3198         if (acl->cached == 0)
3199                 goto out;
3200         ret = -ERANGE; /* see getxattr(2) man page */
3201         if (acl->len > buflen)
3202                 goto out;
3203         memcpy(buf, acl->data, acl->len);
3204 out_len:
3205         ret = acl->len;
3206 out:
3207         spin_unlock(&inode->i_lock);
3208         return ret;
3209 }
3210
3211 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3212 {
3213         struct nfs4_cached_acl *acl;
3214
3215         if (buf && acl_len <= PAGE_SIZE) {
3216                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3217                 if (acl == NULL)
3218                         goto out;
3219                 acl->cached = 1;
3220                 memcpy(acl->data, buf, acl_len);
3221         } else {
3222                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3223                 if (acl == NULL)
3224                         goto out;
3225                 acl->cached = 0;
3226         }
3227         acl->len = acl_len;
3228 out:
3229         nfs4_set_cached_acl(inode, acl);
3230 }
3231
3232 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3233 {
3234         struct page *pages[NFS4ACL_MAXPAGES];
3235         struct nfs_getaclargs args = {
3236                 .fh = NFS_FH(inode),
3237                 .acl_pages = pages,
3238                 .acl_len = buflen,
3239         };
3240         struct nfs_getaclres res = {
3241                 .acl_len = buflen,
3242         };
3243         void *resp_buf;
3244         struct rpc_message msg = {
3245                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3246                 .rpc_argp = &args,
3247                 .rpc_resp = &res,
3248         };
3249         struct page *localpage = NULL;
3250         int ret;
3251
3252         if (buflen < PAGE_SIZE) {
3253                 /* As long as we're doing a round trip to the server anyway,
3254                  * let's be prepared for a page of acl data. */
3255                 localpage = alloc_page(GFP_KERNEL);
3256                 resp_buf = page_address(localpage);
3257                 if (localpage == NULL)
3258                         return -ENOMEM;
3259                 args.acl_pages[0] = localpage;
3260                 args.acl_pgbase = 0;
3261                 args.acl_len = PAGE_SIZE;
3262         } else {
3263                 resp_buf = buf;
3264                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3265         }
3266         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3267         if (ret)
3268                 goto out_free;
3269         if (res.acl_len > args.acl_len)
3270                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3271         else
3272                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3273         if (buf) {
3274                 ret = -ERANGE;
3275                 if (res.acl_len > buflen)
3276                         goto out_free;
3277                 if (localpage)
3278                         memcpy(buf, resp_buf, res.acl_len);
3279         }
3280         ret = res.acl_len;
3281 out_free:
3282         if (localpage)
3283                 __free_page(localpage);
3284         return ret;
3285 }
3286
3287 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3288 {
3289         struct nfs4_exception exception = { };
3290         ssize_t ret;
3291         do {
3292                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3293                 if (ret >= 0)
3294                         break;
3295                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3296         } while (exception.retry);
3297         return ret;
3298 }
3299
3300 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3301 {
3302         struct nfs_server *server = NFS_SERVER(inode);
3303         int ret;
3304
3305         if (!nfs4_server_supports_acls(server))
3306                 return -EOPNOTSUPP;
3307         ret = nfs_revalidate_inode(server, inode);
3308         if (ret < 0)
3309                 return ret;
3310         ret = nfs4_read_cached_acl(inode, buf, buflen);
3311         if (ret != -ENOENT)
3312                 return ret;
3313         return nfs4_get_acl_uncached(inode, buf, buflen);
3314 }
3315
3316 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3317 {
3318         struct nfs_server *server = NFS_SERVER(inode);
3319         struct page *pages[NFS4ACL_MAXPAGES];
3320         struct nfs_setaclargs arg = {
3321                 .fh             = NFS_FH(inode),
3322                 .acl_pages      = pages,
3323                 .acl_len        = buflen,
3324         };
3325         struct nfs_setaclres res;
3326         struct rpc_message msg = {
3327                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3328                 .rpc_argp       = &arg,
3329                 .rpc_resp       = &res,
3330         };
3331         int ret, i;
3332
3333         if (!nfs4_server_supports_acls(server))
3334                 return -EOPNOTSUPP;
3335         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3336         if (i < 0)
3337                 return i;
3338         nfs_inode_return_delegation(inode);
3339         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3340
3341         /*
3342          * Free each page after tx, so the only ref left is
3343          * held by the network stack
3344          */
3345         for (; i > 0; i--)
3346                 put_page(pages[i-1]);
3347
3348         nfs_access_zap_cache(inode);
3349         nfs_zap_acl_cache(inode);
3350         return ret;
3351 }
3352
3353 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3354 {
3355         struct nfs4_exception exception = { };
3356         int err;
3357         do {
3358                 err = nfs4_handle_exception(NFS_SERVER(inode),
3359                                 __nfs4_proc_set_acl(inode, buf, buflen),
3360                                 &exception);
3361         } while (exception.retry);
3362         return err;
3363 }
3364
3365 static int
3366 _nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs_client *clp, struct nfs4_state *state)
3367 {
3368         if (!clp || task->tk_status >= 0)
3369                 return 0;
3370         switch(task->tk_status) {
3371                 case -NFS4ERR_ADMIN_REVOKED:
3372                 case -NFS4ERR_BAD_STATEID:
3373                 case -NFS4ERR_OPENMODE:
3374                         if (state == NULL)
3375                                 break;
3376                         nfs4_state_mark_reclaim_nograce(clp, state);
3377                 case -NFS4ERR_STALE_CLIENTID:
3378                 case -NFS4ERR_STALE_STATEID:
3379                 case -NFS4ERR_EXPIRED:
3380                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3381                         nfs4_schedule_state_recovery(clp);
3382                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3383                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3384                         task->tk_status = 0;
3385                         return -EAGAIN;
3386 #if defined(CONFIG_NFS_V4_1)
3387                 case -NFS4ERR_BADSESSION:
3388                 case -NFS4ERR_BADSLOT:
3389                 case -NFS4ERR_BAD_HIGH_SLOT:
3390                 case -NFS4ERR_DEADSESSION:
3391                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3392                 case -NFS4ERR_SEQ_FALSE_RETRY:
3393                 case -NFS4ERR_SEQ_MISORDERED:
3394                         dprintk("%s ERROR %d, Reset session\n", __func__,
3395                                 task->tk_status);
3396                         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
3397                         task->tk_status = 0;
3398                         return -EAGAIN;
3399 #endif /* CONFIG_NFS_V4_1 */
3400                 case -NFS4ERR_DELAY:
3401                         if (server)
3402                                 nfs_inc_server_stats(server, NFSIOS_DELAY);
3403                 case -NFS4ERR_GRACE:
3404                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3405                         task->tk_status = 0;
3406                         return -EAGAIN;
3407                 case -NFS4ERR_OLD_STATEID:
3408                         task->tk_status = 0;
3409                         return -EAGAIN;
3410         }
3411         task->tk_status = nfs4_map_errors(task->tk_status);
3412         return 0;
3413 }
3414
3415 static int
3416 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3417 {
3418         return _nfs4_async_handle_error(task, server, server->nfs_client, state);
3419 }
3420
3421 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3422 {
3423         nfs4_verifier sc_verifier;
3424         struct nfs4_setclientid setclientid = {
3425                 .sc_verifier = &sc_verifier,
3426                 .sc_prog = program,
3427         };
3428         struct rpc_message msg = {
3429                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3430                 .rpc_argp = &setclientid,
3431                 .rpc_resp = clp,
3432                 .rpc_cred = cred,
3433         };
3434         __be32 *p;
3435         int loop = 0;
3436         int status;
3437
3438         p = (__be32*)sc_verifier.data;
3439         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3440         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3441
3442         for(;;) {
3443                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3444                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3445                                 clp->cl_ipaddr,
3446                                 rpc_peeraddr2str(clp->cl_rpcclient,
3447                                                         RPC_DISPLAY_ADDR),
3448                                 rpc_peeraddr2str(clp->cl_rpcclient,
3449                                                         RPC_DISPLAY_PROTO),
3450                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3451                                 clp->cl_id_uniquifier);
3452                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3453                                 sizeof(setclientid.sc_netid),
3454                                 rpc_peeraddr2str(clp->cl_rpcclient,
3455                                                         RPC_DISPLAY_NETID));
3456                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3457                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3458                                 clp->cl_ipaddr, port >> 8, port & 255);
3459
3460                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3461                 if (status != -NFS4ERR_CLID_INUSE)
3462                         break;
3463                 if (signalled())
3464                         break;
3465                 if (loop++ & 1)
3466                         ssleep(clp->cl_lease_time + 1);
3467                 else
3468                         if (++clp->cl_id_uniquifier == 0)
3469                                 break;
3470         }
3471         return status;
3472 }
3473
3474 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3475 {
3476         struct nfs_fsinfo fsinfo;
3477         struct rpc_message msg = {
3478                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3479                 .rpc_argp = clp,
3480                 .rpc_resp = &fsinfo,
3481                 .rpc_cred = cred,
3482         };
3483         unsigned long now;
3484         int status;
3485
3486         now = jiffies;
3487         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3488         if (status == 0) {
3489                 spin_lock(&clp->cl_lock);
3490                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3491                 clp->cl_last_renewal = now;
3492                 spin_unlock(&clp->cl_lock);
3493         }
3494         return status;
3495 }
3496
3497 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3498 {
3499         long timeout = 0;
3500         int err;
3501         do {
3502                 err = _nfs4_proc_setclientid_confirm(clp, cred);
3503                 switch (err) {
3504                         case 0:
3505                                 return err;
3506                         case -NFS4ERR_RESOURCE:
3507                                 /* The IBM lawyers misread another document! */
3508                         case -NFS4ERR_DELAY:
3509                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3510                 }
3511         } while (err == 0);
3512         return err;
3513 }
3514
3515 struct nfs4_delegreturndata {
3516         struct nfs4_delegreturnargs args;
3517         struct nfs4_delegreturnres res;
3518         struct nfs_fh fh;
3519         nfs4_stateid stateid;
3520         unsigned long timestamp;
3521         struct nfs_fattr fattr;
3522         int rpc_status;
3523 };
3524
3525 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3526 {
3527         struct nfs4_delegreturndata *data = calldata;
3528
3529         nfs4_sequence_done_free_slot(data->res.server, &data->res.seq_res,
3530                                      task->tk_status);
3531
3532         data->rpc_status = task->tk_status;
3533         if (data->rpc_status == 0)
3534                 renew_lease(data->res.server, data->timestamp);
3535 }
3536
3537 static void nfs4_delegreturn_release(void *calldata)
3538 {
3539         kfree(calldata);
3540 }
3541
3542 #if defined(CONFIG_NFS_V4_1)
3543 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3544 {
3545         struct nfs4_delegreturndata *d_data;
3546
3547         d_data = (struct nfs4_delegreturndata *)data;
3548
3549         if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3550                                 &d_data->args.seq_args,
3551                                 &d_data->res.seq_res, 1, task))
3552                 return;
3553         rpc_call_start(task);
3554 }
3555 #endif /* CONFIG_NFS_V4_1 */
3556
3557 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3558 #if defined(CONFIG_NFS_V4_1)
3559         .rpc_call_prepare = nfs4_delegreturn_prepare,
3560 #endif /* CONFIG_NFS_V4_1 */
3561         .rpc_call_done = nfs4_delegreturn_done,
3562         .rpc_release = nfs4_delegreturn_release,
3563 };
3564
3565 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3566 {
3567         struct nfs4_delegreturndata *data;
3568         struct nfs_server *server = NFS_SERVER(inode);
3569         struct rpc_task *task;
3570         struct rpc_message msg = {
3571                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3572                 .rpc_cred = cred,
3573         };
3574         struct rpc_task_setup task_setup_data = {
3575                 .rpc_client = server->client,
3576                 .rpc_message = &msg,
3577                 .callback_ops = &nfs4_delegreturn_ops,
3578                 .flags = RPC_TASK_ASYNC,
3579         };
3580         int status = 0;
3581
3582         data = kzalloc(sizeof(*data), GFP_KERNEL);
3583         if (data == NULL)
3584                 return -ENOMEM;
3585         data->args.fhandle = &data->fh;
3586         data->args.stateid = &data->stateid;
3587         data->args.bitmask = server->attr_bitmask;
3588         nfs_copy_fh(&data->fh, NFS_FH(inode));
3589         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3590         data->res.fattr = &data->fattr;
3591         data->res.server = server;
3592         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3593         nfs_fattr_init(data->res.fattr);
3594         data->timestamp = jiffies;
3595         data->rpc_status = 0;
3596
3597         task_setup_data.callback_data = data;
3598         msg.rpc_argp = &data->args,
3599         msg.rpc_resp = &data->res,
3600         task = rpc_run_task(&task_setup_data);
3601         if (IS_ERR(task))
3602                 return PTR_ERR(task);
3603         if (!issync)
3604                 goto out;
3605         status = nfs4_wait_for_completion_rpc_task(task);
3606         if (status != 0)
3607                 goto out;
3608         status = data->rpc_status;
3609         if (status != 0)
3610                 goto out;
3611         nfs_refresh_inode(inode, &data->fattr);
3612 out:
3613         rpc_put_task(task);
3614         return status;
3615 }
3616
3617 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3618 {
3619         struct nfs_server *server = NFS_SERVER(inode);
3620         struct nfs4_exception exception = { };
3621         int err;
3622         do {
3623                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3624                 switch (err) {
3625                         case -NFS4ERR_STALE_STATEID:
3626                         case -NFS4ERR_EXPIRED:
3627                         case 0:
3628                                 return 0;
3629                 }
3630                 err = nfs4_handle_exception(server, err, &exception);
3631         } while (exception.retry);
3632         return err;
3633 }
3634
3635 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3636 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3637
3638 /*
3639  * sleep, with exponential backoff, and retry the LOCK operation.
3640  */
3641 static unsigned long
3642 nfs4_set_lock_task_retry(unsigned long timeout)
3643 {
3644         schedule_timeout_killable(timeout);
3645         timeout <<= 1;
3646         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3647                 return NFS4_LOCK_MAXTIMEOUT;
3648         return timeout;
3649 }
3650
3651 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3652 {
3653         struct inode *inode = state->inode;
3654         struct nfs_server *server = NFS_SERVER(inode);
3655         struct nfs_client *clp = server->nfs_client;
3656         struct nfs_lockt_args arg = {
3657                 .fh = NFS_FH(inode),
3658                 .fl = request,
3659         };
3660         struct nfs_lockt_res res = {
3661                 .denied = request,
3662         };
3663         struct rpc_message msg = {
3664                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3665                 .rpc_argp       = &arg,
3666                 .rpc_resp       = &res,
3667                 .rpc_cred       = state->owner->so_cred,
3668         };
3669         struct nfs4_lock_state *lsp;
3670         int status;
3671
3672         arg.lock_owner.clientid = clp->cl_clientid;
3673         status = nfs4_set_lock_state(state, request);
3674         if (status != 0)
3675                 goto out;
3676         lsp = request->fl_u.nfs4_fl.owner;
3677         arg.lock_owner.id = lsp->ls_id.id;
3678         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3679         switch (status) {
3680                 case 0:
3681                         request->fl_type = F_UNLCK;
3682                         break;
3683                 case -NFS4ERR_DENIED:
3684                         status = 0;
3685         }
3686         request->fl_ops->fl_release_private(request);
3687 out:
3688         return status;
3689 }
3690
3691 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3692 {
3693         struct nfs4_exception exception = { };
3694         int err;
3695
3696         do {
3697                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3698                                 _nfs4_proc_getlk(state, cmd, request),
3699                                 &exception);
3700         } while (exception.retry);
3701         return err;
3702 }
3703
3704 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3705 {
3706         int res = 0;
3707         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3708                 case FL_POSIX:
3709                         res = posix_lock_file_wait(file, fl);
3710                         break;
3711                 case FL_FLOCK:
3712                         res = flock_lock_file_wait(file, fl);
3713                         break;
3714                 default:
3715                         BUG();
3716         }
3717         return res;
3718 }
3719
3720 struct nfs4_unlockdata {
3721         struct nfs_locku_args arg;
3722         struct nfs_locku_res res;
3723         struct nfs4_lock_state *lsp;
3724         struct nfs_open_context *ctx;
3725         struct file_lock fl;
3726         const struct nfs_server *server;
3727         unsigned long timestamp;
3728 };
3729
3730 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3731                 struct nfs_open_context *ctx,
3732                 struct nfs4_lock_state *lsp,
3733                 struct nfs_seqid *seqid)
3734 {
3735         struct nfs4_unlockdata *p;
3736         struct inode *inode = lsp->ls_state->inode;
3737
3738         p = kzalloc(sizeof(*p), GFP_KERNEL);
3739         if (p == NULL)
3740                 return NULL;
3741         p->arg.fh = NFS_FH(inode);
3742         p->arg.fl = &p->fl;
3743         p->arg.seqid = seqid;
3744         p->res.seqid = seqid;
3745         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3746         p->arg.stateid = &lsp->ls_stateid;
3747         p->lsp = lsp;
3748         atomic_inc(&lsp->ls_count);
3749         /* Ensure we don't close file until we're done freeing locks! */
3750         p->ctx = get_nfs_open_context(ctx);
3751         memcpy(&p->fl, fl, sizeof(p->fl));
3752         p->server = NFS_SERVER(inode);
3753         return p;
3754 }
3755
3756 static void nfs4_locku_release_calldata(void *data)
3757 {
3758         struct nfs4_unlockdata *calldata = data;
3759         nfs_free_seqid(calldata->arg.seqid);
3760         nfs4_put_lock_state(calldata->lsp);
3761         put_nfs_open_context(calldata->ctx);
3762         kfree(calldata);
3763 }
3764
3765 static void nfs4_locku_done(struct rpc_task *task, void *data)
3766 {
3767         struct nfs4_unlockdata *calldata = data;
3768
3769         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3770                            task->tk_status);
3771         if (RPC_ASSASSINATED(task))
3772                 return;
3773         switch (task->tk_status) {
3774                 case 0:
3775                         memcpy(calldata->lsp->ls_stateid.data,
3776                                         calldata->res.stateid.data,
3777                                         sizeof(calldata->lsp->ls_stateid.data));
3778                         renew_lease(calldata->server, calldata->timestamp);
3779                         break;
3780                 case -NFS4ERR_BAD_STATEID:
3781                 case -NFS4ERR_OLD_STATEID:
3782                 case -NFS4ERR_STALE_STATEID:
3783                 case -NFS4ERR_EXPIRED:
3784                         break;
3785                 default:
3786                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3787                                 nfs4_restart_rpc(task,
3788                                                 calldata->server->nfs_client);
3789         }
3790         nfs4_sequence_free_slot(calldata->server->nfs_client,
3791                                 &calldata->res.seq_res);
3792 }
3793
3794 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3795 {
3796         struct nfs4_unlockdata *calldata = data;
3797
3798         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3799                 return;
3800         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3801                 /* Note: exit _without_ running nfs4_locku_done */
3802                 task->tk_action = NULL;
3803                 return;
3804         }
3805         calldata->timestamp = jiffies;
3806         if (nfs4_setup_sequence(calldata->server->nfs_client,
3807                                 &calldata->arg.seq_args,
3808                                 &calldata->res.seq_res, 1, task))
3809                 return;
3810         rpc_call_start(task);
3811 }
3812
3813 static const struct rpc_call_ops nfs4_locku_ops = {
3814         .rpc_call_prepare = nfs4_locku_prepare,
3815         .rpc_call_done = nfs4_locku_done,
3816         .rpc_release = nfs4_locku_release_calldata,
3817 };
3818
3819 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3820                 struct nfs_open_context *ctx,
3821                 struct nfs4_lock_state *lsp,
3822                 struct nfs_seqid *seqid)
3823 {
3824         struct nfs4_unlockdata *data;
3825         struct rpc_message msg = {
3826                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3827                 .rpc_cred = ctx->cred,
3828         };
3829         struct rpc_task_setup task_setup_data = {
3830                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3831                 .rpc_message = &msg,
3832                 .callback_ops = &nfs4_locku_ops,
3833                 .workqueue = nfsiod_workqueue,
3834                 .flags = RPC_TASK_ASYNC,
3835         };
3836
3837         /* Ensure this is an unlock - when canceling a lock, the
3838          * canceled lock is passed in, and it won't be an unlock.
3839          */
3840         fl->fl_type = F_UNLCK;
3841
3842         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3843         if (data == NULL) {
3844                 nfs_free_seqid(seqid);
3845                 return ERR_PTR(-ENOMEM);
3846         }
3847
3848         msg.rpc_argp = &data->arg,
3849         msg.rpc_resp = &data->res,
3850         task_setup_data.callback_data = data;
3851         return rpc_run_task(&task_setup_data);
3852 }
3853
3854 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3855 {
3856         struct nfs_inode *nfsi = NFS_I(state->inode);
3857         struct nfs_seqid *seqid;
3858         struct nfs4_lock_state *lsp;
3859         struct rpc_task *task;
3860         int status = 0;
3861         unsigned char fl_flags = request->fl_flags;
3862
3863         status = nfs4_set_lock_state(state, request);
3864         /* Unlock _before_ we do the RPC call */
3865         request->fl_flags |= FL_EXISTS;
3866         down_read(&nfsi->rwsem);
3867         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3868                 up_read(&nfsi->rwsem);
3869                 goto out;
3870         }
3871         up_read(&nfsi->rwsem);
3872         if (status != 0)
3873                 goto out;
3874         /* Is this a delegated lock? */
3875         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3876                 goto out;
3877         lsp = request->fl_u.nfs4_fl.owner;
3878         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3879         status = -ENOMEM;
3880         if (seqid == NULL)
3881                 goto out;
3882         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3883         status = PTR_ERR(task);
3884         if (IS_ERR(task))
3885                 goto out;
3886         status = nfs4_wait_for_completion_rpc_task(task);
3887         rpc_put_task(task);
3888 out:
3889         request->fl_flags = fl_flags;
3890         return status;
3891 }
3892
3893 struct nfs4_lockdata {
3894         struct nfs_lock_args arg;
3895         struct nfs_lock_res res;
3896         struct nfs4_lock_state *lsp;
3897         struct nfs_open_context *ctx;
3898         struct file_lock fl;
3899         unsigned long timestamp;
3900         int rpc_status;
3901         int cancelled;
3902         struct nfs_server *server;
3903 };
3904
3905 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3906                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3907 {
3908         struct nfs4_lockdata *p;
3909         struct inode *inode = lsp->ls_state->inode;
3910         struct nfs_server *server = NFS_SERVER(inode);
3911
3912         p = kzalloc(sizeof(*p), GFP_KERNEL);
3913         if (p == NULL)
3914                 return NULL;
3915
3916         p->arg.fh = NFS_FH(inode);
3917         p->arg.fl = &p->fl;
3918         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3919         if (p->arg.open_seqid == NULL)
3920                 goto out_free;
3921         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3922         if (p->arg.lock_seqid == NULL)
3923                 goto out_free_seqid;
3924         p->arg.lock_stateid = &lsp->ls_stateid;
3925         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3926         p->arg.lock_owner.id = lsp->ls_id.id;
3927         p->res.lock_seqid = p->arg.lock_seqid;
3928         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3929         p->lsp = lsp;
3930         p->server = server;
3931         atomic_inc(&lsp->ls_count);
3932         p->ctx = get_nfs_open_context(ctx);
3933         memcpy(&p->fl, fl, sizeof(p->fl));
3934         return p;
3935 out_free_seqid:
3936         nfs_free_seqid(p->arg.open_seqid);
3937 out_free:
3938         kfree(p);
3939         return NULL;
3940 }
3941
3942 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3943 {
3944         struct nfs4_lockdata *data = calldata;
3945         struct nfs4_state *state = data->lsp->ls_state;
3946
3947         dprintk("%s: begin!\n", __func__);
3948         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3949                 return;
3950         /* Do we need to do an open_to_lock_owner? */
3951         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3952                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3953                         return;
3954                 data->arg.open_stateid = &state->stateid;
3955                 data->arg.new_lock_owner = 1;
3956                 data->res.open_seqid = data->arg.open_seqid;
3957         } else
3958                 data->arg.new_lock_owner = 0;
3959         data->timestamp = jiffies;
3960         if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
3961                                 &data->res.seq_res, 1, task))
3962                 return;
3963         rpc_call_start(task);
3964         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3965 }
3966
3967 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3968 {
3969         struct nfs4_lockdata *data = calldata;
3970
3971         dprintk("%s: begin!\n", __func__);
3972
3973         nfs4_sequence_done_free_slot(data->server, &data->res.seq_res,
3974                                      task->tk_status);
3975
3976         data->rpc_status = task->tk_status;
3977         if (RPC_ASSASSINATED(task))
3978                 goto out;
3979         if (data->arg.new_lock_owner != 0) {
3980                 if (data->rpc_status == 0)
3981                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3982                 else
3983                         goto out;
3984         }
3985         if (data->rpc_status == 0) {
3986                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3987                                         sizeof(data->lsp->ls_stateid.data));
3988                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3989                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3990         }
3991 out:
3992         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3993 }
3994
3995 static void nfs4_lock_release(void *calldata)
3996 {
3997         struct nfs4_lockdata *data = calldata;
3998
3999         dprintk("%s: begin!\n", __func__);
4000         nfs_free_seqid(data->arg.open_seqid);
4001         if (data->cancelled != 0) {
4002                 struct rpc_task *task;
4003                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4004                                 data->arg.lock_seqid);
4005                 if (!IS_ERR(task))
4006                         rpc_put_task(task);
4007                 dprintk("%s: cancelling lock!\n", __func__);
4008         } else
4009                 nfs_free_seqid(data->arg.lock_seqid);
4010         nfs4_put_lock_state(data->lsp);
4011         put_nfs_open_context(data->ctx);
4012         kfree(data);
4013         dprintk("%s: done!\n", __func__);
4014 }
4015
4016 static const struct rpc_call_ops nfs4_lock_ops = {
4017         .rpc_call_prepare = nfs4_lock_prepare,
4018         .rpc_call_done = nfs4_lock_done,
4019         .rpc_release = nfs4_lock_release,
4020 };
4021
4022 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4023 {
4024         struct nfs_client *clp = server->nfs_client;
4025         struct nfs4_state *state = lsp->ls_state;
4026
4027         switch (error) {
4028         case -NFS4ERR_ADMIN_REVOKED:
4029         case -NFS4ERR_BAD_STATEID:
4030         case -NFS4ERR_EXPIRED:
4031                 if (new_lock_owner != 0 ||
4032                    (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0)
4033                         nfs4_state_mark_reclaim_nograce(clp, state);
4034                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4035         };
4036 }
4037
4038 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
4039 {
4040         struct nfs4_lockdata *data;
4041         struct rpc_task *task;
4042         struct rpc_message msg = {
4043                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4044                 .rpc_cred = state->owner->so_cred,
4045         };
4046         struct rpc_task_setup task_setup_data = {
4047                 .rpc_client = NFS_CLIENT(state->inode),
4048                 .rpc_message = &msg,
4049                 .callback_ops = &nfs4_lock_ops,
4050                 .workqueue = nfsiod_workqueue,
4051                 .flags = RPC_TASK_ASYNC,
4052         };
4053         int ret;
4054
4055         dprintk("%s: begin!\n", __func__);
4056         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4057                         fl->fl_u.nfs4_fl.owner);
4058         if (data == NULL)
4059                 return -ENOMEM;
4060         if (IS_SETLKW(cmd))
4061                 data->arg.block = 1;
4062         if (reclaim != 0)
4063                 data->arg.reclaim = 1;
4064         msg.rpc_argp = &data->arg,
4065         msg.rpc_resp = &data->res,
4066         task_setup_data.callback_data = data;
4067         task = rpc_run_task(&task_setup_data);
4068         if (IS_ERR(task))
4069                 return PTR_ERR(task);
4070         ret = nfs4_wait_for_completion_rpc_task(task);
4071         if (ret == 0) {
4072                 ret = data->rpc_status;
4073                 if (ret)
4074                         nfs4_handle_setlk_error(data->server, data->lsp,
4075                                         data->arg.new_lock_owner, ret);
4076         } else
4077                 data->cancelled = 1;
4078         rpc_put_task(task);
4079         dprintk("%s: done, ret = %d!\n", __func__, ret);
4080         return ret;
4081 }
4082
4083 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4084 {
4085         struct nfs_server *server = NFS_SERVER(state->inode);
4086         struct nfs4_exception exception = { };
4087         int err;
4088
4089         do {
4090                 /* Cache the lock if possible... */
4091                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4092                         return 0;
4093                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
4094                 if (err != -NFS4ERR_DELAY)
4095                         break;
4096                 nfs4_handle_exception(server, err, &exception);
4097         } while (exception.retry);
4098         return err;
4099 }
4100
4101 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4102 {
4103         struct nfs_server *server = NFS_SERVER(state->inode);
4104         struct nfs4_exception exception = { };
4105         int err;
4106
4107         err = nfs4_set_lock_state(state, request);
4108         if (err != 0)
4109                 return err;
4110         do {
4111                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4112                         return 0;
4113                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
4114                 if (err != -NFS4ERR_DELAY)
4115                         break;
4116                 nfs4_handle_exception(server, err, &exception);
4117         } while (exception.retry);
4118         return err;
4119 }
4120
4121 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4122 {
4123         struct nfs_inode *nfsi = NFS_I(state->inode);
4124         unsigned char fl_flags = request->fl_flags;
4125         int status = -ENOLCK;
4126
4127         if ((fl_flags & FL_POSIX) &&
4128                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4129                 goto out;
4130         /* Is this a delegated open? */
4131         status = nfs4_set_lock_state(state, request);
4132         if (status != 0)
4133                 goto out;
4134         request->fl_flags |= FL_ACCESS;
4135         status = do_vfs_lock(request->fl_file, request);
4136         if (status < 0)
4137                 goto out;
4138         down_read(&nfsi->rwsem);
4139         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4140                 /* Yes: cache locks! */
4141                 /* ...but avoid races with delegation recall... */
4142                 request->fl_flags = fl_flags & ~FL_SLEEP;
4143                 status = do_vfs_lock(request->fl_file, request);
4144                 goto out_unlock;
4145         }
4146         status = _nfs4_do_setlk(state, cmd, request, 0);
4147         if (status != 0)
4148                 goto out_unlock;
4149         /* Note: we always want to sleep here! */
4150         request->fl_flags = fl_flags | FL_SLEEP;
4151         if (do_vfs_lock(request->fl_file, request) < 0)
4152                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4153 out_unlock:
4154         up_read(&nfsi->rwsem);
4155 out:
4156         request->fl_flags = fl_flags;
4157         return status;
4158 }
4159
4160 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4161 {
4162         struct nfs4_exception exception = { };
4163         int err;
4164
4165         do {
4166                 err = _nfs4_proc_setlk(state, cmd, request);
4167                 if (err == -NFS4ERR_DENIED)
4168                         err = -EAGAIN;
4169                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4170                                 err, &exception);
4171         } while (exception.retry);
4172         return err;
4173 }
4174
4175 static int
4176 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4177 {
4178         struct nfs_open_context *ctx;
4179         struct nfs4_state *state;
4180         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4181         int status;
4182
4183         /* verify open state */
4184         ctx = nfs_file_open_context(filp);
4185         state = ctx->state;
4186
4187         if (request->fl_start < 0 || request->fl_end < 0)
4188                 return -EINVAL;
4189
4190         if (IS_GETLK(cmd)) {
4191                 if (state != NULL)
4192                         return nfs4_proc_getlk(state, F_GETLK, request);
4193                 return 0;
4194         }
4195
4196         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4197                 return -EINVAL;
4198
4199         if (request->fl_type == F_UNLCK) {
4200                 if (state != NULL)
4201                         return nfs4_proc_unlck(state, cmd, request);
4202                 return 0;
4203         }
4204
4205         if (state == NULL)
4206                 return -ENOLCK;
4207         do {
4208                 status = nfs4_proc_setlk(state, cmd, request);
4209                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4210                         break;
4211                 timeout = nfs4_set_lock_task_retry(timeout);
4212                 status = -ERESTARTSYS;
4213                 if (signalled())
4214                         break;
4215         } while(status < 0);
4216         return status;
4217 }
4218
4219 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4220 {
4221         struct nfs_server *server = NFS_SERVER(state->inode);
4222         struct nfs4_exception exception = { };
4223         int err;
4224
4225         err = nfs4_set_lock_state(state, fl);
4226         if (err != 0)
4227                 goto out;
4228         do {
4229                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
4230                 switch (err) {
4231                         default:
4232                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4233                                                 __func__, err);
4234                         case 0:
4235                         case -ESTALE:
4236                                 goto out;
4237                         case -NFS4ERR_EXPIRED:
4238                         case -NFS4ERR_STALE_CLIENTID:
4239                         case -NFS4ERR_STALE_STATEID:
4240                                 nfs4_schedule_state_recovery(server->nfs_client);
4241                                 goto out;
4242                         case -ERESTARTSYS:
4243                                 /*
4244                                  * The show must go on: exit, but mark the
4245                                  * stateid as needing recovery.
4246                                  */
4247                         case -NFS4ERR_ADMIN_REVOKED:
4248                         case -NFS4ERR_BAD_STATEID:
4249                         case -NFS4ERR_OPENMODE:
4250                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4251                                 err = 0;
4252                                 goto out;
4253                         case -ENOMEM:
4254                         case -NFS4ERR_DENIED:
4255                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4256                                 err = 0;
4257                                 goto out;
4258                         case -NFS4ERR_DELAY:
4259                                 break;
4260                 }
4261                 err = nfs4_handle_exception(server, err, &exception);
4262         } while (exception.retry);
4263 out:
4264         return err;
4265 }
4266
4267 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4268
4269 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4270                 size_t buflen, int flags)
4271 {
4272         struct inode *inode = dentry->d_inode;
4273
4274         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4275                 return -EOPNOTSUPP;
4276
4277         return nfs4_proc_set_acl(inode, buf, buflen);
4278 }
4279
4280 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4281  * and that's what we'll do for e.g. user attributes that haven't been set.
4282  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4283  * attributes in kernel-managed attribute namespaces. */
4284 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4285                 size_t buflen)
4286 {
4287         struct inode *inode = dentry->d_inode;
4288
4289         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4290                 return -EOPNOTSUPP;
4291
4292         return nfs4_proc_get_acl(inode, buf, buflen);
4293 }
4294
4295 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4296 {
4297         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4298
4299         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4300                 return 0;
4301         if (buf && buflen < len)
4302                 return -ERANGE;
4303         if (buf)
4304                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4305         return len;
4306 }
4307
4308 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4309 {
4310         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4311                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4312                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4313                 return;
4314
4315         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4316                 NFS_ATTR_FATTR_NLINK;
4317         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4318         fattr->nlink = 2;
4319 }
4320
4321 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4322                 struct nfs4_fs_locations *fs_locations, struct page *page)
4323 {
4324         struct nfs_server *server = NFS_SERVER(dir);
4325         u32 bitmask[2] = {
4326                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4327                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4328         };
4329         struct nfs4_fs_locations_arg args = {
4330                 .dir_fh = NFS_FH(dir),
4331                 .name = name,
4332                 .page = page,
4333                 .bitmask = bitmask,
4334         };
4335         struct nfs4_fs_locations_res res = {
4336                 .fs_locations = fs_locations,
4337         };
4338         struct rpc_message msg = {
4339                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4340                 .rpc_argp = &args,
4341                 .rpc_resp = &res,
4342         };
4343         int status;
4344
4345         dprintk("%s: start\n", __func__);
4346         nfs_fattr_init(&fs_locations->fattr);
4347         fs_locations->server = server;
4348         fs_locations->nlocations = 0;
4349         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4350         nfs_fixup_referral_attributes(&fs_locations->fattr);
4351         dprintk("%s: returned status = %d\n", __func__, status);
4352         return status;
4353 }
4354
4355 #ifdef CONFIG_NFS_V4_1
4356 /*
4357  * nfs4_proc_exchange_id()
4358  *
4359  * Since the clientid has expired, all compounds using sessions
4360  * associated with the stale clientid will be returning
4361  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4362  * be in some phase of session reset.
4363  */
4364 static int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4365 {
4366         nfs4_verifier verifier;
4367         struct nfs41_exchange_id_args args = {
4368                 .client = clp,
4369                 .flags = clp->cl_exchange_flags,
4370         };
4371         struct nfs41_exchange_id_res res = {
4372                 .client = clp,
4373         };
4374         int status;
4375         struct rpc_message msg = {
4376                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4377                 .rpc_argp = &args,
4378                 .rpc_resp = &res,
4379                 .rpc_cred = cred,
4380         };
4381         __be32 *p;
4382
4383         dprintk("--> %s\n", __func__);
4384         BUG_ON(clp == NULL);
4385
4386         p = (u32 *)verifier.data;
4387         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4388         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4389         args.verifier = &verifier;
4390
4391         while (1) {
4392                 args.id_len = scnprintf(args.id, sizeof(args.id),
4393                                         "%s/%s %u",
4394                                         clp->cl_ipaddr,
4395                                         rpc_peeraddr2str(clp->cl_rpcclient,
4396                                                          RPC_DISPLAY_ADDR),
4397                                         clp->cl_id_uniquifier);
4398
4399                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4400
4401                 if (status != NFS4ERR_CLID_INUSE)
4402                         break;
4403
4404                 if (signalled())
4405                         break;
4406
4407                 if (++clp->cl_id_uniquifier == 0)
4408                         break;
4409         }
4410
4411         dprintk("<-- %s status= %d\n", __func__, status);
4412         return status;
4413 }
4414
4415 struct nfs4_get_lease_time_data {
4416         struct nfs4_get_lease_time_args *args;
4417         struct nfs4_get_lease_time_res *res;
4418         struct nfs_client *clp;
4419 };
4420
4421 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4422                                         void *calldata)
4423 {
4424         int ret;
4425         struct nfs4_get_lease_time_data *data =
4426                         (struct nfs4_get_lease_time_data *)calldata;
4427
4428         dprintk("--> %s\n", __func__);
4429         /* just setup sequence, do not trigger session recovery
4430            since we're invoked within one */
4431         ret = nfs41_setup_sequence(data->clp->cl_session,
4432                                         &data->args->la_seq_args,
4433                                         &data->res->lr_seq_res, 0, task);
4434
4435         BUG_ON(ret == -EAGAIN);
4436         rpc_call_start(task);
4437         dprintk("<-- %s\n", __func__);
4438 }
4439
4440 /*
4441  * Called from nfs4_state_manager thread for session setup, so don't recover
4442  * from sequence operation or clientid errors.
4443  */
4444 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4445 {
4446         struct nfs4_get_lease_time_data *data =
4447                         (struct nfs4_get_lease_time_data *)calldata;
4448
4449         dprintk("--> %s\n", __func__);
4450         nfs41_sequence_done(data->clp, &data->res->lr_seq_res, task->tk_status);
4451         switch (task->tk_status) {
4452         case -NFS4ERR_DELAY:
4453         case -NFS4ERR_GRACE:
4454                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4455                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4456                 task->tk_status = 0;
4457                 nfs4_restart_rpc(task, data->clp);
4458                 return;
4459         }
4460         nfs41_sequence_free_slot(data->clp, &data->res->lr_seq_res);
4461         dprintk("<-- %s\n", __func__);
4462 }
4463
4464 struct rpc_call_ops nfs4_get_lease_time_ops = {
4465         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4466         .rpc_call_done = nfs4_get_lease_time_done,
4467 };
4468
4469 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4470 {
4471         struct rpc_task *task;
4472         struct nfs4_get_lease_time_args args;
4473         struct nfs4_get_lease_time_res res = {
4474                 .lr_fsinfo = fsinfo,
4475         };
4476         struct nfs4_get_lease_time_data data = {
4477                 .args = &args,
4478                 .res = &res,
4479                 .clp = clp,
4480         };
4481         struct rpc_message msg = {
4482                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4483                 .rpc_argp = &args,
4484                 .rpc_resp = &res,
4485         };
4486         struct rpc_task_setup task_setup = {
4487                 .rpc_client = clp->cl_rpcclient,
4488                 .rpc_message = &msg,
4489                 .callback_ops = &nfs4_get_lease_time_ops,
4490                 .callback_data = &data
4491         };
4492         int status;
4493
4494         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4495         dprintk("--> %s\n", __func__);
4496         task = rpc_run_task(&task_setup);
4497
4498         if (IS_ERR(task))
4499                 status = PTR_ERR(task);
4500         else {
4501                 status = task->tk_status;
4502                 rpc_put_task(task);
4503         }
4504         dprintk("<-- %s return %d\n", __func__, status);
4505
4506         return status;
4507 }
4508
4509 /*
4510  * Reset a slot table
4511  */
4512 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, int max_slots,
4513                 int old_max_slots, int ivalue)
4514 {
4515         int i;
4516         int ret = 0;
4517
4518         dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__, max_slots, tbl);
4519
4520         /*
4521          * Until we have dynamic slot table adjustment, insist
4522          * upon the same slot table size
4523          */
4524         if (max_slots != old_max_slots) {
4525                 dprintk("%s reset slot table does't match old\n",
4526                         __func__);
4527                 ret = -EINVAL; /*XXX NFS4ERR_REQ_TOO_BIG ? */
4528                 goto out;
4529         }
4530         spin_lock(&tbl->slot_tbl_lock);
4531         for (i = 0; i < max_slots; ++i)
4532                 tbl->slots[i].seq_nr = ivalue;
4533         tbl->highest_used_slotid = -1;
4534         spin_unlock(&tbl->slot_tbl_lock);
4535         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4536                 tbl, tbl->slots, tbl->max_slots);
4537 out:
4538         dprintk("<-- %s: return %d\n", __func__, ret);
4539         return ret;
4540 }
4541
4542 /*
4543  * Reset the forechannel and backchannel slot tables
4544  */
4545 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4546 {
4547         int status;
4548
4549         status = nfs4_reset_slot_table(&session->fc_slot_table,
4550                         session->fc_attrs.max_reqs,
4551                         session->fc_slot_table.max_slots,
4552                         1);
4553         if (status)
4554                 return status;
4555
4556         status = nfs4_reset_slot_table(&session->bc_slot_table,
4557                         session->bc_attrs.max_reqs,
4558                         session->bc_slot_table.max_slots,
4559                         0);
4560         return status;
4561 }
4562
4563 /* Destroy the slot table */
4564 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4565 {
4566         if (session->fc_slot_table.slots != NULL) {
4567                 kfree(session->fc_slot_table.slots);
4568                 session->fc_slot_table.slots = NULL;
4569         }
4570         if (session->bc_slot_table.slots != NULL) {
4571                 kfree(session->bc_slot_table.slots);
4572                 session->bc_slot_table.slots = NULL;
4573         }
4574         return;
4575 }
4576
4577 /*
4578  * Initialize slot table
4579  */
4580 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4581                 int max_slots, int ivalue)
4582 {
4583         int i;
4584         struct nfs4_slot *slot;
4585         int ret = -ENOMEM;
4586
4587         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4588
4589         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4590
4591         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_KERNEL);
4592         if (!slot)
4593                 goto out;
4594         for (i = 0; i < max_slots; ++i)
4595                 slot[i].seq_nr = ivalue;
4596         ret = 0;
4597
4598         spin_lock(&tbl->slot_tbl_lock);
4599         if (tbl->slots != NULL) {
4600                 spin_unlock(&tbl->slot_tbl_lock);
4601                 dprintk("%s: slot table already initialized. tbl=%p slots=%p\n",
4602                         __func__, tbl, tbl->slots);
4603                 WARN_ON(1);
4604                 goto out_free;
4605         }
4606         tbl->max_slots = max_slots;
4607         tbl->slots = slot;
4608         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4609         spin_unlock(&tbl->slot_tbl_lock);
4610         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4611                 tbl, tbl->slots, tbl->max_slots);
4612 out:
4613         dprintk("<-- %s: return %d\n", __func__, ret);
4614         return ret;
4615
4616 out_free:
4617         kfree(slot);
4618         goto out;
4619 }
4620
4621 /*
4622  * Initialize the forechannel and backchannel tables
4623  */
4624 static int nfs4_init_slot_tables(struct nfs4_session *session)
4625 {
4626         int status;
4627
4628         status = nfs4_init_slot_table(&session->fc_slot_table,
4629                         session->fc_attrs.max_reqs, 1);
4630         if (status)
4631                 return status;
4632
4633         status = nfs4_init_slot_table(&session->bc_slot_table,
4634                         session->bc_attrs.max_reqs, 0);
4635         if (status)
4636                 nfs4_destroy_slot_tables(session);
4637
4638         return status;
4639 }
4640
4641 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4642 {
4643         struct nfs4_session *session;
4644         struct nfs4_slot_table *tbl;
4645
4646         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4647         if (!session)
4648                 return NULL;
4649
4650         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
4651         /*
4652          * The create session reply races with the server back
4653          * channel probe. Mark the client NFS_CS_SESSION_INITING
4654          * so that the client back channel can find the
4655          * nfs_client struct
4656          */
4657         clp->cl_cons_state = NFS_CS_SESSION_INITING;
4658
4659         tbl = &session->fc_slot_table;
4660         spin_lock_init(&tbl->slot_tbl_lock);
4661         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4662
4663         tbl = &session->bc_slot_table;
4664         spin_lock_init(&tbl->slot_tbl_lock);
4665         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4666
4667         session->clp = clp;
4668         return session;
4669 }
4670
4671 void nfs4_destroy_session(struct nfs4_session *session)
4672 {
4673         nfs4_proc_destroy_session(session);
4674         dprintk("%s Destroy backchannel for xprt %p\n",
4675                 __func__, session->clp->cl_rpcclient->cl_xprt);
4676         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4677                                 NFS41_BC_MIN_CALLBACKS);
4678         nfs4_destroy_slot_tables(session);
4679         kfree(session);
4680 }
4681
4682 /*
4683  * Initialize the values to be used by the client in CREATE_SESSION
4684  * If nfs4_init_session set the fore channel request and response sizes,
4685  * use them.
4686  *
4687  * Set the back channel max_resp_sz_cached to zero to force the client to
4688  * always set csa_cachethis to FALSE because the current implementation
4689  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4690  */
4691 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4692 {
4693         struct nfs4_session *session = args->client->cl_session;
4694         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4695                      mxresp_sz = session->fc_attrs.max_resp_sz;
4696
4697         if (mxrqst_sz == 0)
4698                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4699         if (mxresp_sz == 0)
4700                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4701         /* Fore channel attributes */
4702         args->fc_attrs.headerpadsz = 0;
4703         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4704         args->fc_attrs.max_resp_sz = mxresp_sz;
4705         args->fc_attrs.max_resp_sz_cached = mxresp_sz;
4706         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4707         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4708
4709         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4710                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4711                 __func__,
4712                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4713                 args->fc_attrs.max_resp_sz_cached, args->fc_attrs.max_ops,
4714                 args->fc_attrs.max_reqs);
4715
4716         /* Back channel attributes */
4717         args->bc_attrs.headerpadsz = 0;
4718         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4719         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4720         args->bc_attrs.max_resp_sz_cached = 0;
4721         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4722         args->bc_attrs.max_reqs = 1;
4723
4724         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4725                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4726                 __func__,
4727                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4728                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4729                 args->bc_attrs.max_reqs);
4730 }
4731
4732 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4733 {
4734         if (rcvd <= sent)
4735                 return 0;
4736         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4737                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4738         return -EINVAL;
4739 }
4740
4741 #define _verify_fore_channel_attr(_name_) \
4742         _verify_channel_attr("fore", #_name_, \
4743                              args->fc_attrs._name_, \
4744                              session->fc_attrs._name_)
4745
4746 #define _verify_back_channel_attr(_name_) \
4747         _verify_channel_attr("back", #_name_, \
4748                              args->bc_attrs._name_, \
4749                              session->bc_attrs._name_)
4750
4751 /*
4752  * The server is not allowed to increase the fore channel header pad size,
4753  * maximum response size, or maximum number of operations.
4754  *
4755  * The back channel attributes are only negotiatied down: We send what the
4756  * (back channel) server insists upon.
4757  */
4758 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4759                                      struct nfs4_session *session)
4760 {
4761         int ret = 0;
4762
4763         ret |= _verify_fore_channel_attr(headerpadsz);
4764         ret |= _verify_fore_channel_attr(max_resp_sz);
4765         ret |= _verify_fore_channel_attr(max_ops);
4766
4767         ret |= _verify_back_channel_attr(headerpadsz);
4768         ret |= _verify_back_channel_attr(max_rqst_sz);
4769         ret |= _verify_back_channel_attr(max_resp_sz);
4770         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4771         ret |= _verify_back_channel_attr(max_ops);
4772         ret |= _verify_back_channel_attr(max_reqs);
4773
4774         return ret;
4775 }
4776
4777 static int _nfs4_proc_create_session(struct nfs_client *clp)
4778 {
4779         struct nfs4_session *session = clp->cl_session;
4780         struct nfs41_create_session_args args = {
4781                 .client = clp,
4782                 .cb_program = NFS4_CALLBACK,
4783         };
4784         struct nfs41_create_session_res res = {
4785                 .client = clp,
4786         };
4787         struct rpc_message msg = {
4788                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4789                 .rpc_argp = &args,
4790                 .rpc_resp = &res,
4791         };
4792         int status;
4793
4794         nfs4_init_channel_attrs(&args);
4795         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4796
4797         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4798
4799         if (!status)
4800                 /* Verify the session's negotiated channel_attrs values */
4801                 status = nfs4_verify_channel_attrs(&args, session);
4802         if (!status) {
4803                 /* Increment the clientid slot sequence id */
4804                 clp->cl_seqid++;
4805         }
4806
4807         return status;
4808 }
4809
4810 /*
4811  * Issues a CREATE_SESSION operation to the server.
4812  * It is the responsibility of the caller to verify the session is
4813  * expired before calling this routine.
4814  */
4815 int nfs4_proc_create_session(struct nfs_client *clp, int reset)
4816 {
4817         int status;
4818         unsigned *ptr;
4819         struct nfs_fsinfo fsinfo;
4820         struct nfs4_session *session = clp->cl_session;
4821
4822         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4823
4824         status = _nfs4_proc_create_session(clp);
4825         if (status)
4826                 goto out;
4827
4828         /* Init or reset the fore channel */
4829         if (reset)
4830                 status = nfs4_reset_slot_tables(session);
4831         else
4832                 status = nfs4_init_slot_tables(session);
4833         dprintk("fore channel slot table initialization returned %d\n", status);
4834         if (status)
4835                 goto out;
4836
4837         ptr = (unsigned *)&session->sess_id.data[0];
4838         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4839                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4840
4841         if (reset)
4842                 /* Lease time is aleady set */
4843                 goto out;
4844
4845         /* Get the lease time */
4846         status = nfs4_proc_get_lease_time(clp, &fsinfo);
4847         if (status == 0) {
4848                 /* Update lease time and schedule renewal */
4849                 spin_lock(&clp->cl_lock);
4850                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4851                 clp->cl_last_renewal = jiffies;
4852                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
4853                 spin_unlock(&clp->cl_lock);
4854
4855                 nfs4_schedule_state_renewal(clp);
4856         }
4857 out:
4858         dprintk("<-- %s\n", __func__);
4859         return status;
4860 }
4861
4862 /*
4863  * Issue the over-the-wire RPC DESTROY_SESSION.
4864  * The caller must serialize access to this routine.
4865  */
4866 int nfs4_proc_destroy_session(struct nfs4_session *session)
4867 {
4868         int status = 0;
4869         struct rpc_message msg;
4870
4871         dprintk("--> nfs4_proc_destroy_session\n");
4872
4873         /* session is still being setup */
4874         if (session->clp->cl_cons_state != NFS_CS_READY)
4875                 return status;
4876
4877         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4878         msg.rpc_argp = session;
4879         msg.rpc_resp = NULL;
4880         msg.rpc_cred = NULL;
4881         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4882
4883         if (status)
4884                 printk(KERN_WARNING
4885                         "Got error %d from the server on DESTROY_SESSION. "
4886                         "Session has been destroyed regardless...\n", status);
4887
4888         dprintk("<-- nfs4_proc_destroy_session\n");
4889         return status;
4890 }
4891
4892 int nfs4_init_session(struct nfs_server *server)
4893 {
4894         struct nfs_client *clp = server->nfs_client;
4895         int ret;
4896
4897         if (!nfs4_has_session(clp))
4898                 return 0;
4899
4900         clp->cl_session->fc_attrs.max_rqst_sz = server->wsize;
4901         clp->cl_session->fc_attrs.max_resp_sz = server->rsize;
4902         ret = nfs4_recover_expired_lease(server);
4903         if (!ret)
4904                 ret = nfs4_check_client_ready(clp);
4905         return ret;
4906 }
4907
4908 /*
4909  * Renew the cl_session lease.
4910  */
4911 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
4912 {
4913         struct nfs4_sequence_args args;
4914         struct nfs4_sequence_res res;
4915
4916         struct rpc_message msg = {
4917                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4918                 .rpc_argp = &args,
4919                 .rpc_resp = &res,
4920                 .rpc_cred = cred,
4921         };
4922
4923         args.sa_cache_this = 0;
4924
4925         return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
4926                                        &res, 0);
4927 }
4928
4929 void nfs41_sequence_call_done(struct rpc_task *task, void *data)
4930 {
4931         struct nfs_client *clp = (struct nfs_client *)data;
4932
4933         nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);
4934
4935         if (task->tk_status < 0) {
4936                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
4937
4938                 if (_nfs4_async_handle_error(task, NULL, clp, NULL)
4939                                                                 == -EAGAIN) {
4940                         nfs4_restart_rpc(task, clp);
4941                         return;
4942                 }
4943         }
4944         nfs41_sequence_free_slot(clp, task->tk_msg.rpc_resp);
4945         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
4946
4947         kfree(task->tk_msg.rpc_argp);
4948         kfree(task->tk_msg.rpc_resp);
4949
4950         dprintk("<-- %s\n", __func__);
4951 }
4952
4953 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
4954 {
4955         struct nfs_client *clp;
4956         struct nfs4_sequence_args *args;
4957         struct nfs4_sequence_res *res;
4958
4959         clp = (struct nfs_client *)data;
4960         args = task->tk_msg.rpc_argp;
4961         res = task->tk_msg.rpc_resp;
4962
4963         if (nfs4_setup_sequence(clp, args, res, 0, task))
4964                 return;
4965         rpc_call_start(task);
4966 }
4967
4968 static const struct rpc_call_ops nfs41_sequence_ops = {
4969         .rpc_call_done = nfs41_sequence_call_done,
4970         .rpc_call_prepare = nfs41_sequence_prepare,
4971 };
4972
4973 static int nfs41_proc_async_sequence(struct nfs_client *clp,
4974                                      struct rpc_cred *cred)
4975 {
4976         struct nfs4_sequence_args *args;
4977         struct nfs4_sequence_res *res;
4978         struct rpc_message msg = {
4979                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4980                 .rpc_cred = cred,
4981         };
4982
4983         args = kzalloc(sizeof(*args), GFP_KERNEL);
4984         if (!args)
4985                 return -ENOMEM;
4986         res = kzalloc(sizeof(*res), GFP_KERNEL);
4987         if (!res) {
4988                 kfree(args);
4989                 return -ENOMEM;
4990         }
4991         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
4992         msg.rpc_argp = args;
4993         msg.rpc_resp = res;
4994
4995         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
4996                               &nfs41_sequence_ops, (void *)clp);
4997 }
4998
4999 #endif /* CONFIG_NFS_V4_1 */
5000
5001 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
5002         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5003         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5004         .recover_open   = nfs4_open_reclaim,
5005         .recover_lock   = nfs4_lock_reclaim,
5006         .establish_clid = nfs4_init_clientid,
5007         .get_clid_cred  = nfs4_get_setclientid_cred,
5008 };
5009
5010 #if defined(CONFIG_NFS_V4_1)
5011 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
5012         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
5013         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
5014         .recover_open   = nfs4_open_reclaim,
5015         .recover_lock   = nfs4_lock_reclaim,
5016         .establish_clid = nfs4_proc_exchange_id,
5017         .get_clid_cred  = nfs4_get_exchange_id_cred,
5018 };
5019 #endif /* CONFIG_NFS_V4_1 */
5020
5021 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
5022         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5023         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5024         .recover_open   = nfs4_open_expired,
5025         .recover_lock   = nfs4_lock_expired,
5026         .establish_clid = nfs4_init_clientid,
5027         .get_clid_cred  = nfs4_get_setclientid_cred,
5028 };
5029
5030 #if defined(CONFIG_NFS_V4_1)
5031 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
5032         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
5033         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
5034         .recover_open   = nfs4_open_expired,
5035         .recover_lock   = nfs4_lock_expired,
5036         .establish_clid = nfs4_proc_exchange_id,
5037         .get_clid_cred  = nfs4_get_exchange_id_cred,
5038 };
5039 #endif /* CONFIG_NFS_V4_1 */
5040
5041 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
5042         .sched_state_renewal = nfs4_proc_async_renew,
5043         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
5044         .renew_lease = nfs4_proc_renew,
5045 };
5046
5047 #if defined(CONFIG_NFS_V4_1)
5048 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
5049         .sched_state_renewal = nfs41_proc_async_sequence,
5050         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
5051         .renew_lease = nfs4_proc_sequence,
5052 };
5053 #endif
5054
5055 /*
5056  * Per minor version reboot and network partition recovery ops
5057  */
5058
5059 struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[] = {
5060         &nfs40_reboot_recovery_ops,
5061 #if defined(CONFIG_NFS_V4_1)
5062         &nfs41_reboot_recovery_ops,
5063 #endif
5064 };
5065
5066 struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[] = {
5067         &nfs40_nograce_recovery_ops,
5068 #if defined(CONFIG_NFS_V4_1)
5069         &nfs41_nograce_recovery_ops,
5070 #endif
5071 };
5072
5073 struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[] = {
5074         &nfs40_state_renewal_ops,
5075 #if defined(CONFIG_NFS_V4_1)
5076         &nfs41_state_renewal_ops,
5077 #endif
5078 };
5079
5080 static const struct inode_operations nfs4_file_inode_operations = {
5081         .permission     = nfs_permission,
5082         .getattr        = nfs_getattr,
5083         .setattr        = nfs_setattr,
5084         .getxattr       = nfs4_getxattr,
5085         .setxattr       = nfs4_setxattr,
5086         .listxattr      = nfs4_listxattr,
5087 };
5088
5089 const struct nfs_rpc_ops nfs_v4_clientops = {
5090         .version        = 4,                    /* protocol version */
5091         .dentry_ops     = &nfs4_dentry_operations,
5092         .dir_inode_ops  = &nfs4_dir_inode_operations,
5093         .file_inode_ops = &nfs4_file_inode_operations,
5094         .getroot        = nfs4_proc_get_root,
5095         .getattr        = nfs4_proc_getattr,
5096         .setattr        = nfs4_proc_setattr,
5097         .lookupfh       = nfs4_proc_lookupfh,
5098         .lookup         = nfs4_proc_lookup,
5099         .access         = nfs4_proc_access,
5100         .readlink       = nfs4_proc_readlink,
5101         .create         = nfs4_proc_create,
5102         .remove         = nfs4_proc_remove,
5103         .unlink_setup   = nfs4_proc_unlink_setup,
5104         .unlink_done    = nfs4_proc_unlink_done,
5105         .rename         = nfs4_proc_rename,
5106         .link           = nfs4_proc_link,
5107         .symlink        = nfs4_proc_symlink,
5108         .mkdir          = nfs4_proc_mkdir,
5109         .rmdir          = nfs4_proc_remove,
5110         .readdir        = nfs4_proc_readdir,
5111         .mknod          = nfs4_proc_mknod,
5112         .statfs         = nfs4_proc_statfs,
5113         .fsinfo         = nfs4_proc_fsinfo,
5114         .pathconf       = nfs4_proc_pathconf,
5115         .set_capabilities = nfs4_server_capabilities,
5116         .decode_dirent  = nfs4_decode_dirent,
5117         .read_setup     = nfs4_proc_read_setup,
5118         .read_done      = nfs4_read_done,
5119         .write_setup    = nfs4_proc_write_setup,
5120         .write_done     = nfs4_write_done,
5121         .commit_setup   = nfs4_proc_commit_setup,
5122         .commit_done    = nfs4_commit_done,
5123         .lock           = nfs4_proc_lock,
5124         .clear_acl_cache = nfs4_zap_acl_attr,
5125         .close_context  = nfs4_close_context,
5126 };
5127
5128 /*
5129  * Local variables:
5130  *  c-basic-offset: 8
5131  * End:
5132  */