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_CONFIRM) {
1443                 status = _nfs4_proc_open_confirm(data);
1444                 if (status != 0)
1445                         return status;
1446         }
1447         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1448                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1449         return 0;
1450 }
1451
1452 static int nfs4_recover_expired_lease(struct nfs_server *server)
1453 {
1454         struct nfs_client *clp = server->nfs_client;
1455         unsigned int loop;
1456         int ret;
1457
1458         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
1459                 ret = nfs4_wait_clnt_recover(clp);
1460                 if (ret != 0)
1461                         break;
1462                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1463                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1464                         break;
1465                 nfs4_schedule_state_recovery(clp);
1466                 ret = -EIO;
1467         }
1468         return ret;
1469 }
1470
1471 /*
1472  * OPEN_EXPIRED:
1473  *      reclaim state on the server after a network partition.
1474  *      Assumes caller holds the appropriate lock
1475  */
1476 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1477 {
1478         struct nfs4_opendata *opendata;
1479         int ret;
1480
1481         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1482         if (IS_ERR(opendata))
1483                 return PTR_ERR(opendata);
1484         ret = nfs4_open_recover(opendata, state);
1485         if (ret == -ESTALE)
1486                 d_drop(ctx->path.dentry);
1487         nfs4_opendata_put(opendata);
1488         return ret;
1489 }
1490
1491 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1492 {
1493         struct nfs_server *server = NFS_SERVER(state->inode);
1494         struct nfs4_exception exception = { };
1495         int err;
1496
1497         do {
1498                 err = _nfs4_open_expired(ctx, state);
1499                 switch (err) {
1500                 default:
1501                         goto out;
1502                 case -NFS4ERR_GRACE:
1503                 case -NFS4ERR_DELAY:
1504                         nfs4_handle_exception(server, err, &exception);
1505                         err = 0;
1506                 }
1507         } while (exception.retry);
1508 out:
1509         return err;
1510 }
1511
1512 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1513 {
1514         struct nfs_open_context *ctx;
1515         int ret;
1516
1517         ctx = nfs4_state_find_open_context(state);
1518         if (IS_ERR(ctx))
1519                 return PTR_ERR(ctx);
1520         ret = nfs4_do_open_expired(ctx, state);
1521         put_nfs_open_context(ctx);
1522         return ret;
1523 }
1524
1525 /*
1526  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1527  * fields corresponding to attributes that were used to store the verifier.
1528  * Make sure we clobber those fields in the later setattr call
1529  */
1530 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1531 {
1532         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1533             !(sattr->ia_valid & ATTR_ATIME_SET))
1534                 sattr->ia_valid |= ATTR_ATIME;
1535
1536         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1537             !(sattr->ia_valid & ATTR_MTIME_SET))
1538                 sattr->ia_valid |= ATTR_MTIME;
1539 }
1540
1541 /*
1542  * Returns a referenced nfs4_state
1543  */
1544 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)
1545 {
1546         struct nfs4_state_owner  *sp;
1547         struct nfs4_state     *state = NULL;
1548         struct nfs_server       *server = NFS_SERVER(dir);
1549         struct nfs4_opendata *opendata;
1550         int status;
1551
1552         /* Protect against reboot recovery conflicts */
1553         status = -ENOMEM;
1554         if (!(sp = nfs4_get_state_owner(server, cred))) {
1555                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1556                 goto out_err;
1557         }
1558         status = nfs4_recover_expired_lease(server);
1559         if (status != 0)
1560                 goto err_put_state_owner;
1561         if (path->dentry->d_inode != NULL)
1562                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1563         status = -ENOMEM;
1564         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1565         if (opendata == NULL)
1566                 goto err_put_state_owner;
1567
1568         if (path->dentry->d_inode != NULL)
1569                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1570
1571         status = _nfs4_proc_open(opendata);
1572         if (status != 0)
1573                 goto err_opendata_put;
1574
1575         if (opendata->o_arg.open_flags & O_EXCL)
1576                 nfs4_exclusive_attrset(opendata, sattr);
1577
1578         state = nfs4_opendata_to_nfs4_state(opendata);
1579         status = PTR_ERR(state);
1580         if (IS_ERR(state))
1581                 goto err_opendata_put;
1582         nfs4_opendata_put(opendata);
1583         nfs4_put_state_owner(sp);
1584         *res = state;
1585         return 0;
1586 err_opendata_put:
1587         nfs4_opendata_put(opendata);
1588 err_put_state_owner:
1589         nfs4_put_state_owner(sp);
1590 out_err:
1591         *res = NULL;
1592         return status;
1593 }
1594
1595
1596 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)
1597 {
1598         struct nfs4_exception exception = { };
1599         struct nfs4_state *res;
1600         int status;
1601
1602         do {
1603                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1604                 if (status == 0)
1605                         break;
1606                 /* NOTE: BAD_SEQID means the server and client disagree about the
1607                  * book-keeping w.r.t. state-changing operations
1608                  * (OPEN/CLOSE/LOCK/LOCKU...)
1609                  * It is actually a sign of a bug on the client or on the server.
1610                  *
1611                  * If we receive a BAD_SEQID error in the particular case of
1612                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1613                  * have unhashed the old state_owner for us, and that we can
1614                  * therefore safely retry using a new one. We should still warn
1615                  * the user though...
1616                  */
1617                 if (status == -NFS4ERR_BAD_SEQID) {
1618                         printk(KERN_WARNING "NFS: v4 server %s "
1619                                         " returned a bad sequence-id error!\n",
1620                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1621                         exception.retry = 1;
1622                         continue;
1623                 }
1624                 /*
1625                  * BAD_STATEID on OPEN means that the server cancelled our
1626                  * state before it received the OPEN_CONFIRM.
1627                  * Recover by retrying the request as per the discussion
1628                  * on Page 181 of RFC3530.
1629                  */
1630                 if (status == -NFS4ERR_BAD_STATEID) {
1631                         exception.retry = 1;
1632                         continue;
1633                 }
1634                 if (status == -EAGAIN) {
1635                         /* We must have found a delegation */
1636                         exception.retry = 1;
1637                         continue;
1638                 }
1639                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1640                                         status, &exception));
1641         } while (exception.retry);
1642         return res;
1643 }
1644
1645 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1646                             struct nfs_fattr *fattr, struct iattr *sattr,
1647                             struct nfs4_state *state)
1648 {
1649         struct nfs_server *server = NFS_SERVER(inode);
1650         struct nfs_setattrargs  arg = {
1651                 .fh             = NFS_FH(inode),
1652                 .iap            = sattr,
1653                 .server         = server,
1654                 .bitmask = server->attr_bitmask,
1655         };
1656         struct nfs_setattrres  res = {
1657                 .fattr          = fattr,
1658                 .server         = server,
1659         };
1660         struct rpc_message msg = {
1661                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1662                 .rpc_argp       = &arg,
1663                 .rpc_resp       = &res,
1664                 .rpc_cred       = cred,
1665         };
1666         unsigned long timestamp = jiffies;
1667         int status;
1668
1669         nfs_fattr_init(fattr);
1670
1671         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1672                 /* Use that stateid */
1673         } else if (state != NULL) {
1674                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1675         } else
1676                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1677
1678         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
1679         if (status == 0 && state != NULL)
1680                 renew_lease(server, timestamp);
1681         return status;
1682 }
1683
1684 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1685                            struct nfs_fattr *fattr, struct iattr *sattr,
1686                            struct nfs4_state *state)
1687 {
1688         struct nfs_server *server = NFS_SERVER(inode);
1689         struct nfs4_exception exception = { };
1690         int err;
1691         do {
1692                 err = nfs4_handle_exception(server,
1693                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1694                                 &exception);
1695         } while (exception.retry);
1696         return err;
1697 }
1698
1699 struct nfs4_closedata {
1700         struct path path;
1701         struct inode *inode;
1702         struct nfs4_state *state;
1703         struct nfs_closeargs arg;
1704         struct nfs_closeres res;
1705         struct nfs_fattr fattr;
1706         unsigned long timestamp;
1707 };
1708
1709 static void nfs4_free_closedata(void *data)
1710 {
1711         struct nfs4_closedata *calldata = data;
1712         struct nfs4_state_owner *sp = calldata->state->owner;
1713
1714         nfs4_put_open_state(calldata->state);
1715         nfs_free_seqid(calldata->arg.seqid);
1716         nfs4_put_state_owner(sp);
1717         path_put(&calldata->path);
1718         kfree(calldata);
1719 }
1720
1721 static void nfs4_close_done(struct rpc_task *task, void *data)
1722 {
1723         struct nfs4_closedata *calldata = data;
1724         struct nfs4_state *state = calldata->state;
1725         struct nfs_server *server = NFS_SERVER(calldata->inode);
1726
1727         nfs4_sequence_done(server, &calldata->res.seq_res, task->tk_status);
1728         if (RPC_ASSASSINATED(task))
1729                 return;
1730         /* hmm. we are done with the inode, and in the process of freeing
1731          * the state_owner. we keep this around to process errors
1732          */
1733         switch (task->tk_status) {
1734                 case 0:
1735                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1736                         renew_lease(server, calldata->timestamp);
1737                         break;
1738                 case -NFS4ERR_STALE_STATEID:
1739                 case -NFS4ERR_OLD_STATEID:
1740                 case -NFS4ERR_BAD_STATEID:
1741                 case -NFS4ERR_EXPIRED:
1742                         if (calldata->arg.fmode == 0)
1743                                 break;
1744                 default:
1745                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1746                                 nfs4_restart_rpc(task, server->nfs_client);
1747                                 return;
1748                         }
1749         }
1750         nfs4_sequence_free_slot(server->nfs_client, &calldata->res.seq_res);
1751         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1752 }
1753
1754 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1755 {
1756         struct nfs4_closedata *calldata = data;
1757         struct nfs4_state *state = calldata->state;
1758         int clear_rd, clear_wr, clear_rdwr;
1759
1760         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1761                 return;
1762
1763         clear_rd = clear_wr = clear_rdwr = 0;
1764         spin_lock(&state->owner->so_lock);
1765         /* Calculate the change in open mode */
1766         if (state->n_rdwr == 0) {
1767                 if (state->n_rdonly == 0) {
1768                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1769                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1770                 }
1771                 if (state->n_wronly == 0) {
1772                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1773                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1774                 }
1775         }
1776         spin_unlock(&state->owner->so_lock);
1777         if (!clear_rd && !clear_wr && !clear_rdwr) {
1778                 /* Note: exit _without_ calling nfs4_close_done */
1779                 task->tk_action = NULL;
1780                 return;
1781         }
1782         nfs_fattr_init(calldata->res.fattr);
1783         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1784                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1785                 calldata->arg.fmode = FMODE_READ;
1786         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1787                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1788                 calldata->arg.fmode = FMODE_WRITE;
1789         }
1790         calldata->timestamp = jiffies;
1791         if (nfs4_setup_sequence((NFS_SERVER(calldata->inode))->nfs_client,
1792                                 &calldata->arg.seq_args, &calldata->res.seq_res,
1793                                 1, task))
1794                 return;
1795         rpc_call_start(task);
1796 }
1797
1798 static const struct rpc_call_ops nfs4_close_ops = {
1799         .rpc_call_prepare = nfs4_close_prepare,
1800         .rpc_call_done = nfs4_close_done,
1801         .rpc_release = nfs4_free_closedata,
1802 };
1803
1804 /*
1805  * It is possible for data to be read/written from a mem-mapped file
1806  * after the sys_close call (which hits the vfs layer as a flush).
1807  * This means that we can't safely call nfsv4 close on a file until
1808  * the inode is cleared. This in turn means that we are not good
1809  * NFSv4 citizens - we do not indicate to the server to update the file's
1810  * share state even when we are done with one of the three share
1811  * stateid's in the inode.
1812  *
1813  * NOTE: Caller must be holding the sp->so_owner semaphore!
1814  */
1815 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1816 {
1817         struct nfs_server *server = NFS_SERVER(state->inode);
1818         struct nfs4_closedata *calldata;
1819         struct nfs4_state_owner *sp = state->owner;
1820         struct rpc_task *task;
1821         struct rpc_message msg = {
1822                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1823                 .rpc_cred = state->owner->so_cred,
1824         };
1825         struct rpc_task_setup task_setup_data = {
1826                 .rpc_client = server->client,
1827                 .rpc_message = &msg,
1828                 .callback_ops = &nfs4_close_ops,
1829                 .workqueue = nfsiod_workqueue,
1830                 .flags = RPC_TASK_ASYNC,
1831         };
1832         int status = -ENOMEM;
1833
1834         calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
1835         if (calldata == NULL)
1836                 goto out;
1837         calldata->inode = state->inode;
1838         calldata->state = state;
1839         calldata->arg.fh = NFS_FH(state->inode);
1840         calldata->arg.stateid = &state->open_stateid;
1841         if (nfs4_has_session(server->nfs_client))
1842                 memset(calldata->arg.stateid->data, 0, 4);    /* clear seqid */
1843         /* Serialization for the sequence id */
1844         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1845         if (calldata->arg.seqid == NULL)
1846                 goto out_free_calldata;
1847         calldata->arg.fmode = 0;
1848         calldata->arg.bitmask = server->cache_consistency_bitmask;
1849         calldata->res.fattr = &calldata->fattr;
1850         calldata->res.seqid = calldata->arg.seqid;
1851         calldata->res.server = server;
1852         calldata->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
1853         calldata->path.mnt = mntget(path->mnt);
1854         calldata->path.dentry = dget(path->dentry);
1855
1856         msg.rpc_argp = &calldata->arg,
1857         msg.rpc_resp = &calldata->res,
1858         task_setup_data.callback_data = calldata;
1859         task = rpc_run_task(&task_setup_data);
1860         if (IS_ERR(task))
1861                 return PTR_ERR(task);
1862         status = 0;
1863         if (wait)
1864                 status = rpc_wait_for_completion_task(task);
1865         rpc_put_task(task);
1866         return status;
1867 out_free_calldata:
1868         kfree(calldata);
1869 out:
1870         nfs4_put_open_state(state);
1871         nfs4_put_state_owner(sp);
1872         return status;
1873 }
1874
1875 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1876 {
1877         struct file *filp;
1878         int ret;
1879
1880         /* If the open_intent is for execute, we have an extra check to make */
1881         if (fmode & FMODE_EXEC) {
1882                 ret = nfs_may_open(state->inode,
1883                                 state->owner->so_cred,
1884                                 nd->intent.open.flags);
1885                 if (ret < 0)
1886                         goto out_close;
1887         }
1888         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1889         if (!IS_ERR(filp)) {
1890                 struct nfs_open_context *ctx;
1891                 ctx = nfs_file_open_context(filp);
1892                 ctx->state = state;
1893                 return 0;
1894         }
1895         ret = PTR_ERR(filp);
1896 out_close:
1897         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1898         return ret;
1899 }
1900
1901 struct dentry *
1902 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1903 {
1904         struct path path = {
1905                 .mnt = nd->path.mnt,
1906                 .dentry = dentry,
1907         };
1908         struct dentry *parent;
1909         struct iattr attr;
1910         struct rpc_cred *cred;
1911         struct nfs4_state *state;
1912         struct dentry *res;
1913         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1914
1915         if (nd->flags & LOOKUP_CREATE) {
1916                 attr.ia_mode = nd->intent.open.create_mode;
1917                 attr.ia_valid = ATTR_MODE;
1918                 if (!IS_POSIXACL(dir))
1919                         attr.ia_mode &= ~current_umask();
1920         } else {
1921                 attr.ia_valid = 0;
1922                 BUG_ON(nd->intent.open.flags & O_CREAT);
1923         }
1924
1925         cred = rpc_lookup_cred();
1926         if (IS_ERR(cred))
1927                 return (struct dentry *)cred;
1928         parent = dentry->d_parent;
1929         /* Protect against concurrent sillydeletes */
1930         nfs_block_sillyrename(parent);
1931         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1932         put_rpccred(cred);
1933         if (IS_ERR(state)) {
1934                 if (PTR_ERR(state) == -ENOENT) {
1935                         d_add(dentry, NULL);
1936                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1937                 }
1938                 nfs_unblock_sillyrename(parent);
1939                 return (struct dentry *)state;
1940         }
1941         res = d_add_unique(dentry, igrab(state->inode));
1942         if (res != NULL)
1943                 path.dentry = res;
1944         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1945         nfs_unblock_sillyrename(parent);
1946         nfs4_intent_set_file(nd, &path, state, fmode);
1947         return res;
1948 }
1949
1950 int
1951 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1952 {
1953         struct path path = {
1954                 .mnt = nd->path.mnt,
1955                 .dentry = dentry,
1956         };
1957         struct rpc_cred *cred;
1958         struct nfs4_state *state;
1959         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1960
1961         cred = rpc_lookup_cred();
1962         if (IS_ERR(cred))
1963                 return PTR_ERR(cred);
1964         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1965         put_rpccred(cred);
1966         if (IS_ERR(state)) {
1967                 switch (PTR_ERR(state)) {
1968                         case -EPERM:
1969                         case -EACCES:
1970                         case -EDQUOT:
1971                         case -ENOSPC:
1972                         case -EROFS:
1973                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1974                                 return 1;
1975                         default:
1976                                 goto out_drop;
1977                 }
1978         }
1979         if (state->inode == dentry->d_inode) {
1980                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1981                 nfs4_intent_set_file(nd, &path, state, fmode);
1982                 return 1;
1983         }
1984         nfs4_close_sync(&path, state, fmode);
1985 out_drop:
1986         d_drop(dentry);
1987         return 0;
1988 }
1989
1990 void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
1991 {
1992         if (ctx->state == NULL)
1993                 return;
1994         if (is_sync)
1995                 nfs4_close_sync(&ctx->path, ctx->state, ctx->mode);
1996         else
1997                 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
1998 }
1999
2000 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2001 {
2002         struct nfs4_server_caps_arg args = {
2003                 .fhandle = fhandle,
2004         };
2005         struct nfs4_server_caps_res res = {};
2006         struct rpc_message msg = {
2007                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2008                 .rpc_argp = &args,
2009                 .rpc_resp = &res,
2010         };
2011         int status;
2012
2013         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2014         if (status == 0) {
2015                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2016                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2017                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2018                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2019                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2020                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2021                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2022                         server->caps |= NFS_CAP_ACLS;
2023                 if (res.has_links != 0)
2024                         server->caps |= NFS_CAP_HARDLINKS;
2025                 if (res.has_symlinks != 0)
2026                         server->caps |= NFS_CAP_SYMLINKS;
2027                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2028                         server->caps |= NFS_CAP_FILEID;
2029                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2030                         server->caps |= NFS_CAP_MODE;
2031                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2032                         server->caps |= NFS_CAP_NLINK;
2033                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2034                         server->caps |= NFS_CAP_OWNER;
2035                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2036                         server->caps |= NFS_CAP_OWNER_GROUP;
2037                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2038                         server->caps |= NFS_CAP_ATIME;
2039                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2040                         server->caps |= NFS_CAP_CTIME;
2041                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2042                         server->caps |= NFS_CAP_MTIME;
2043
2044                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2045                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2046                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2047                 server->acl_bitmask = res.acl_bitmask;
2048         }
2049
2050         return status;
2051 }
2052
2053 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2054 {
2055         struct nfs4_exception exception = { };
2056         int err;
2057         do {
2058                 err = nfs4_handle_exception(server,
2059                                 _nfs4_server_capabilities(server, fhandle),
2060                                 &exception);
2061         } while (exception.retry);
2062         return err;
2063 }
2064
2065 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2066                 struct nfs_fsinfo *info)
2067 {
2068         struct nfs4_lookup_root_arg args = {
2069                 .bitmask = nfs4_fattr_bitmap,
2070         };
2071         struct nfs4_lookup_res res = {
2072                 .server = server,
2073                 .fattr = info->fattr,
2074                 .fh = fhandle,
2075         };
2076         struct rpc_message msg = {
2077                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2078                 .rpc_argp = &args,
2079                 .rpc_resp = &res,
2080         };
2081
2082         nfs_fattr_init(info->fattr);
2083         return nfs4_call_sync(server, &msg, &args, &res, 0);
2084 }
2085
2086 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2087                 struct nfs_fsinfo *info)
2088 {
2089         struct nfs4_exception exception = { };
2090         int err;
2091         do {
2092                 err = nfs4_handle_exception(server,
2093                                 _nfs4_lookup_root(server, fhandle, info),
2094                                 &exception);
2095         } while (exception.retry);
2096         return err;
2097 }
2098
2099 /*
2100  * get the file handle for the "/" directory on the server
2101  */
2102 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
2103                               struct nfs_fsinfo *info)
2104 {
2105         int status;
2106
2107         status = nfs4_lookup_root(server, fhandle, info);
2108         if (status == 0)
2109                 status = nfs4_server_capabilities(server, fhandle);
2110         if (status == 0)
2111                 status = nfs4_do_fsinfo(server, fhandle, info);
2112         return nfs4_map_errors(status);
2113 }
2114
2115 /*
2116  * Get locations and (maybe) other attributes of a referral.
2117  * Note that we'll actually follow the referral later when
2118  * we detect fsid mismatch in inode revalidation
2119  */
2120 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
2121 {
2122         int status = -ENOMEM;
2123         struct page *page = NULL;
2124         struct nfs4_fs_locations *locations = NULL;
2125
2126         page = alloc_page(GFP_KERNEL);
2127         if (page == NULL)
2128                 goto out;
2129         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2130         if (locations == NULL)
2131                 goto out;
2132
2133         status = nfs4_proc_fs_locations(dir, name, locations, page);
2134         if (status != 0)
2135                 goto out;
2136         /* Make sure server returned a different fsid for the referral */
2137         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2138                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
2139                 status = -EIO;
2140                 goto out;
2141         }
2142
2143         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2144         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
2145         if (!fattr->mode)
2146                 fattr->mode = S_IFDIR;
2147         memset(fhandle, 0, sizeof(struct nfs_fh));
2148 out:
2149         if (page)
2150                 __free_page(page);
2151         if (locations)
2152                 kfree(locations);
2153         return status;
2154 }
2155
2156 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2157 {
2158         struct nfs4_getattr_arg args = {
2159                 .fh = fhandle,
2160                 .bitmask = server->attr_bitmask,
2161         };
2162         struct nfs4_getattr_res res = {
2163                 .fattr = fattr,
2164                 .server = server,
2165         };
2166         struct rpc_message msg = {
2167                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2168                 .rpc_argp = &args,
2169                 .rpc_resp = &res,
2170         };
2171
2172         nfs_fattr_init(fattr);
2173         return nfs4_call_sync(server, &msg, &args, &res, 0);
2174 }
2175
2176 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2177 {
2178         struct nfs4_exception exception = { };
2179         int err;
2180         do {
2181                 err = nfs4_handle_exception(server,
2182                                 _nfs4_proc_getattr(server, fhandle, fattr),
2183                                 &exception);
2184         } while (exception.retry);
2185         return err;
2186 }
2187
2188 /*
2189  * The file is not closed if it is opened due to the a request to change
2190  * the size of the file. The open call will not be needed once the
2191  * VFS layer lookup-intents are implemented.
2192  *
2193  * Close is called when the inode is destroyed.
2194  * If we haven't opened the file for O_WRONLY, we
2195  * need to in the size_change case to obtain a stateid.
2196  *
2197  * Got race?
2198  * Because OPEN is always done by name in nfsv4, it is
2199  * possible that we opened a different file by the same
2200  * name.  We can recognize this race condition, but we
2201  * can't do anything about it besides returning an error.
2202  *
2203  * This will be fixed with VFS changes (lookup-intent).
2204  */
2205 static int
2206 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2207                   struct iattr *sattr)
2208 {
2209         struct inode *inode = dentry->d_inode;
2210         struct rpc_cred *cred = NULL;
2211         struct nfs4_state *state = NULL;
2212         int status;
2213
2214         nfs_fattr_init(fattr);
2215
2216         /* Search for an existing open(O_WRITE) file */
2217         if (sattr->ia_valid & ATTR_FILE) {
2218                 struct nfs_open_context *ctx;
2219
2220                 ctx = nfs_file_open_context(sattr->ia_file);
2221                 if (ctx) {
2222                         cred = ctx->cred;
2223                         state = ctx->state;
2224                 }
2225         }
2226
2227         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2228         if (status == 0)
2229                 nfs_setattr_update_inode(inode, sattr);
2230         return status;
2231 }
2232
2233 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
2234                 const struct qstr *name, struct nfs_fh *fhandle,
2235                 struct nfs_fattr *fattr)
2236 {
2237         int                    status;
2238         struct nfs4_lookup_arg args = {
2239                 .bitmask = server->attr_bitmask,
2240                 .dir_fh = dirfh,
2241                 .name = name,
2242         };
2243         struct nfs4_lookup_res res = {
2244                 .server = server,
2245                 .fattr = fattr,
2246                 .fh = fhandle,
2247         };
2248         struct rpc_message msg = {
2249                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2250                 .rpc_argp = &args,
2251                 .rpc_resp = &res,
2252         };
2253
2254         nfs_fattr_init(fattr);
2255
2256         dprintk("NFS call  lookupfh %s\n", name->name);
2257         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2258         dprintk("NFS reply lookupfh: %d\n", status);
2259         return status;
2260 }
2261
2262 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
2263                               struct qstr *name, struct nfs_fh *fhandle,
2264                               struct nfs_fattr *fattr)
2265 {
2266         struct nfs4_exception exception = { };
2267         int err;
2268         do {
2269                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
2270                 /* FIXME: !!!! */
2271                 if (err == -NFS4ERR_MOVED) {
2272                         err = -EREMOTE;
2273                         break;
2274                 }
2275                 err = nfs4_handle_exception(server, err, &exception);
2276         } while (exception.retry);
2277         return err;
2278 }
2279
2280 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
2281                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2282 {
2283         int status;
2284
2285         dprintk("NFS call  lookup %s\n", name->name);
2286         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
2287         if (status == -NFS4ERR_MOVED)
2288                 status = nfs4_get_referral(dir, name, fattr, fhandle);
2289         dprintk("NFS reply lookup: %d\n", status);
2290         return status;
2291 }
2292
2293 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2294 {
2295         struct nfs4_exception exception = { };
2296         int err;
2297         do {
2298                 err = nfs4_handle_exception(NFS_SERVER(dir),
2299                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
2300                                 &exception);
2301         } while (exception.retry);
2302         return err;
2303 }
2304
2305 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2306 {
2307         struct nfs_server *server = NFS_SERVER(inode);
2308         struct nfs_fattr fattr;
2309         struct nfs4_accessargs args = {
2310                 .fh = NFS_FH(inode),
2311                 .bitmask = server->attr_bitmask,
2312         };
2313         struct nfs4_accessres res = {
2314                 .server = server,
2315                 .fattr = &fattr,
2316         };
2317         struct rpc_message msg = {
2318                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2319                 .rpc_argp = &args,
2320                 .rpc_resp = &res,
2321                 .rpc_cred = entry->cred,
2322         };
2323         int mode = entry->mask;
2324         int status;
2325
2326         /*
2327          * Determine which access bits we want to ask for...
2328          */
2329         if (mode & MAY_READ)
2330                 args.access |= NFS4_ACCESS_READ;
2331         if (S_ISDIR(inode->i_mode)) {
2332                 if (mode & MAY_WRITE)
2333                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2334                 if (mode & MAY_EXEC)
2335                         args.access |= NFS4_ACCESS_LOOKUP;
2336         } else {
2337                 if (mode & MAY_WRITE)
2338                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2339                 if (mode & MAY_EXEC)
2340                         args.access |= NFS4_ACCESS_EXECUTE;
2341         }
2342         nfs_fattr_init(&fattr);
2343         status = nfs4_call_sync(server, &msg, &args, &res, 0);
2344         if (!status) {
2345                 entry->mask = 0;
2346                 if (res.access & NFS4_ACCESS_READ)
2347                         entry->mask |= MAY_READ;
2348                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
2349                         entry->mask |= MAY_WRITE;
2350                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
2351                         entry->mask |= MAY_EXEC;
2352                 nfs_refresh_inode(inode, &fattr);
2353         }
2354         return status;
2355 }
2356
2357 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2358 {
2359         struct nfs4_exception exception = { };
2360         int err;
2361         do {
2362                 err = nfs4_handle_exception(NFS_SERVER(inode),
2363                                 _nfs4_proc_access(inode, entry),
2364                                 &exception);
2365         } while (exception.retry);
2366         return err;
2367 }
2368
2369 /*
2370  * TODO: For the time being, we don't try to get any attributes
2371  * along with any of the zero-copy operations READ, READDIR,
2372  * READLINK, WRITE.
2373  *
2374  * In the case of the first three, we want to put the GETATTR
2375  * after the read-type operation -- this is because it is hard
2376  * to predict the length of a GETATTR response in v4, and thus
2377  * align the READ data correctly.  This means that the GETATTR
2378  * may end up partially falling into the page cache, and we should
2379  * shift it into the 'tail' of the xdr_buf before processing.
2380  * To do this efficiently, we need to know the total length
2381  * of data received, which doesn't seem to be available outside
2382  * of the RPC layer.
2383  *
2384  * In the case of WRITE, we also want to put the GETATTR after
2385  * the operation -- in this case because we want to make sure
2386  * we get the post-operation mtime and size.  This means that
2387  * we can't use xdr_encode_pages() as written: we need a variant
2388  * of it which would leave room in the 'tail' iovec.
2389  *
2390  * Both of these changes to the XDR layer would in fact be quite
2391  * minor, but I decided to leave them for a subsequent patch.
2392  */
2393 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2394                 unsigned int pgbase, unsigned int pglen)
2395 {
2396         struct nfs4_readlink args = {
2397                 .fh       = NFS_FH(inode),
2398                 .pgbase   = pgbase,
2399                 .pglen    = pglen,
2400                 .pages    = &page,
2401         };
2402         struct nfs4_readlink_res res;
2403         struct rpc_message msg = {
2404                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2405                 .rpc_argp = &args,
2406                 .rpc_resp = &res,
2407         };
2408
2409         return nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
2410 }
2411
2412 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2413                 unsigned int pgbase, unsigned int pglen)
2414 {
2415         struct nfs4_exception exception = { };
2416         int err;
2417         do {
2418                 err = nfs4_handle_exception(NFS_SERVER(inode),
2419                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2420                                 &exception);
2421         } while (exception.retry);
2422         return err;
2423 }
2424
2425 /*
2426  * Got race?
2427  * We will need to arrange for the VFS layer to provide an atomic open.
2428  * Until then, this create/open method is prone to inefficiency and race
2429  * conditions due to the lookup, create, and open VFS calls from sys_open()
2430  * placed on the wire.
2431  *
2432  * Given the above sorry state of affairs, I'm simply sending an OPEN.
2433  * The file will be opened again in the subsequent VFS open call
2434  * (nfs4_proc_file_open).
2435  *
2436  * The open for read will just hang around to be used by any process that
2437  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
2438  */
2439
2440 static int
2441 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2442                  int flags, struct nameidata *nd)
2443 {
2444         struct path path = {
2445                 .mnt = nd->path.mnt,
2446                 .dentry = dentry,
2447         };
2448         struct nfs4_state *state;
2449         struct rpc_cred *cred;
2450         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2451         int status = 0;
2452
2453         cred = rpc_lookup_cred();
2454         if (IS_ERR(cred)) {
2455                 status = PTR_ERR(cred);
2456                 goto out;
2457         }
2458         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2459         d_drop(dentry);
2460         if (IS_ERR(state)) {
2461                 status = PTR_ERR(state);
2462                 goto out_putcred;
2463         }
2464         d_add(dentry, igrab(state->inode));
2465         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2466         if (flags & O_EXCL) {
2467                 struct nfs_fattr fattr;
2468                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2469                 if (status == 0)
2470                         nfs_setattr_update_inode(state->inode, sattr);
2471                 nfs_post_op_update_inode(state->inode, &fattr);
2472         }
2473         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2474                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2475         else
2476                 nfs4_close_sync(&path, state, fmode);
2477 out_putcred:
2478         put_rpccred(cred);
2479 out:
2480         return status;
2481 }
2482
2483 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2484 {
2485         struct nfs_server *server = NFS_SERVER(dir);
2486         struct nfs_removeargs args = {
2487                 .fh = NFS_FH(dir),
2488                 .name.len = name->len,
2489                 .name.name = name->name,
2490                 .bitmask = server->attr_bitmask,
2491         };
2492         struct nfs_removeres res = {
2493                 .server = server,
2494         };
2495         struct rpc_message msg = {
2496                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2497                 .rpc_argp = &args,
2498                 .rpc_resp = &res,
2499         };
2500         int                     status;
2501
2502         nfs_fattr_init(&res.dir_attr);
2503         status = nfs4_call_sync(server, &msg, &args, &res, 1);
2504         if (status == 0) {
2505                 update_changeattr(dir, &res.cinfo);
2506                 nfs_post_op_update_inode(dir, &res.dir_attr);
2507         }
2508         return status;
2509 }
2510
2511 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2512 {
2513         struct nfs4_exception exception = { };
2514         int err;
2515         do {
2516                 err = nfs4_handle_exception(NFS_SERVER(dir),
2517                                 _nfs4_proc_remove(dir, name),
2518                                 &exception);
2519         } while (exception.retry);
2520         return err;
2521 }
2522
2523 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2524 {
2525         struct nfs_server *server = NFS_SERVER(dir);
2526         struct nfs_removeargs *args = msg->rpc_argp;
2527         struct nfs_removeres *res = msg->rpc_resp;
2528
2529         args->bitmask = server->cache_consistency_bitmask;
2530         res->server = server;
2531         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2532 }
2533
2534 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2535 {
2536         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2537
2538         nfs4_sequence_done(res->server, &res->seq_res, task->tk_status);
2539         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2540                 return 0;
2541         nfs4_sequence_free_slot(res->server->nfs_client, &res->seq_res);
2542         update_changeattr(dir, &res->cinfo);
2543         nfs_post_op_update_inode(dir, &res->dir_attr);
2544         return 1;
2545 }
2546
2547 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2548                 struct inode *new_dir, struct qstr *new_name)
2549 {
2550         struct nfs_server *server = NFS_SERVER(old_dir);
2551         struct nfs4_rename_arg arg = {
2552                 .old_dir = NFS_FH(old_dir),
2553                 .new_dir = NFS_FH(new_dir),
2554                 .old_name = old_name,
2555                 .new_name = new_name,
2556                 .bitmask = server->attr_bitmask,
2557         };
2558         struct nfs_fattr old_fattr, new_fattr;
2559         struct nfs4_rename_res res = {
2560                 .server = server,
2561                 .old_fattr = &old_fattr,
2562                 .new_fattr = &new_fattr,
2563         };
2564         struct rpc_message msg = {
2565                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2566                 .rpc_argp = &arg,
2567                 .rpc_resp = &res,
2568         };
2569         int                     status;
2570
2571         nfs_fattr_init(res.old_fattr);
2572         nfs_fattr_init(res.new_fattr);
2573         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2574
2575         if (!status) {
2576                 update_changeattr(old_dir, &res.old_cinfo);
2577                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2578                 update_changeattr(new_dir, &res.new_cinfo);
2579                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2580         }
2581         return status;
2582 }
2583
2584 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2585                 struct inode *new_dir, struct qstr *new_name)
2586 {
2587         struct nfs4_exception exception = { };
2588         int err;
2589         do {
2590                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2591                                 _nfs4_proc_rename(old_dir, old_name,
2592                                         new_dir, new_name),
2593                                 &exception);
2594         } while (exception.retry);
2595         return err;
2596 }
2597
2598 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2599 {
2600         struct nfs_server *server = NFS_SERVER(inode);
2601         struct nfs4_link_arg arg = {
2602                 .fh     = NFS_FH(inode),
2603                 .dir_fh = NFS_FH(dir),
2604                 .name   = name,
2605                 .bitmask = server->attr_bitmask,
2606         };
2607         struct nfs_fattr fattr, dir_attr;
2608         struct nfs4_link_res res = {
2609                 .server = server,
2610                 .fattr = &fattr,
2611                 .dir_attr = &dir_attr,
2612         };
2613         struct rpc_message msg = {
2614                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2615                 .rpc_argp = &arg,
2616                 .rpc_resp = &res,
2617         };
2618         int                     status;
2619
2620         nfs_fattr_init(res.fattr);
2621         nfs_fattr_init(res.dir_attr);
2622         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
2623         if (!status) {
2624                 update_changeattr(dir, &res.cinfo);
2625                 nfs_post_op_update_inode(dir, res.dir_attr);
2626                 nfs_post_op_update_inode(inode, res.fattr);
2627         }
2628
2629         return status;
2630 }
2631
2632 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2633 {
2634         struct nfs4_exception exception = { };
2635         int err;
2636         do {
2637                 err = nfs4_handle_exception(NFS_SERVER(inode),
2638                                 _nfs4_proc_link(inode, dir, name),
2639                                 &exception);
2640         } while (exception.retry);
2641         return err;
2642 }
2643
2644 struct nfs4_createdata {
2645         struct rpc_message msg;
2646         struct nfs4_create_arg arg;
2647         struct nfs4_create_res res;
2648         struct nfs_fh fh;
2649         struct nfs_fattr fattr;
2650         struct nfs_fattr dir_fattr;
2651 };
2652
2653 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2654                 struct qstr *name, struct iattr *sattr, u32 ftype)
2655 {
2656         struct nfs4_createdata *data;
2657
2658         data = kzalloc(sizeof(*data), GFP_KERNEL);
2659         if (data != NULL) {
2660                 struct nfs_server *server = NFS_SERVER(dir);
2661
2662                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2663                 data->msg.rpc_argp = &data->arg;
2664                 data->msg.rpc_resp = &data->res;
2665                 data->arg.dir_fh = NFS_FH(dir);
2666                 data->arg.server = server;
2667                 data->arg.name = name;
2668                 data->arg.attrs = sattr;
2669                 data->arg.ftype = ftype;
2670                 data->arg.bitmask = server->attr_bitmask;
2671                 data->res.server = server;
2672                 data->res.fh = &data->fh;
2673                 data->res.fattr = &data->fattr;
2674                 data->res.dir_fattr = &data->dir_fattr;
2675                 nfs_fattr_init(data->res.fattr);
2676                 nfs_fattr_init(data->res.dir_fattr);
2677         }
2678         return data;
2679 }
2680
2681 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2682 {
2683         int status = nfs4_call_sync(NFS_SERVER(dir), &data->msg,
2684                                     &data->arg, &data->res, 1);
2685         if (status == 0) {
2686                 update_changeattr(dir, &data->res.dir_cinfo);
2687                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2688                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2689         }
2690         return status;
2691 }
2692
2693 static void nfs4_free_createdata(struct nfs4_createdata *data)
2694 {
2695         kfree(data);
2696 }
2697
2698 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2699                 struct page *page, unsigned int len, struct iattr *sattr)
2700 {
2701         struct nfs4_createdata *data;
2702         int status = -ENAMETOOLONG;
2703
2704         if (len > NFS4_MAXPATHLEN)
2705                 goto out;
2706
2707         status = -ENOMEM;
2708         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2709         if (data == NULL)
2710                 goto out;
2711
2712         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2713         data->arg.u.symlink.pages = &page;
2714         data->arg.u.symlink.len = len;
2715
2716         status = nfs4_do_create(dir, dentry, data);
2717
2718         nfs4_free_createdata(data);
2719 out:
2720         return status;
2721 }
2722
2723 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2724                 struct page *page, unsigned int len, struct iattr *sattr)
2725 {
2726         struct nfs4_exception exception = { };
2727         int err;
2728         do {
2729                 err = nfs4_handle_exception(NFS_SERVER(dir),
2730                                 _nfs4_proc_symlink(dir, dentry, page,
2731                                                         len, sattr),
2732                                 &exception);
2733         } while (exception.retry);
2734         return err;
2735 }
2736
2737 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2738                 struct iattr *sattr)
2739 {
2740         struct nfs4_createdata *data;
2741         int status = -ENOMEM;
2742
2743         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2744         if (data == NULL)
2745                 goto out;
2746
2747         status = nfs4_do_create(dir, dentry, data);
2748
2749         nfs4_free_createdata(data);
2750 out:
2751         return status;
2752 }
2753
2754 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2755                 struct iattr *sattr)
2756 {
2757         struct nfs4_exception exception = { };
2758         int err;
2759         do {
2760                 err = nfs4_handle_exception(NFS_SERVER(dir),
2761                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2762                                 &exception);
2763         } while (exception.retry);
2764         return err;
2765 }
2766
2767 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2768                   u64 cookie, struct page *page, unsigned int count, int plus)
2769 {
2770         struct inode            *dir = dentry->d_inode;
2771         struct nfs4_readdir_arg args = {
2772                 .fh = NFS_FH(dir),
2773                 .pages = &page,
2774                 .pgbase = 0,
2775                 .count = count,
2776                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2777         };
2778         struct nfs4_readdir_res res;
2779         struct rpc_message msg = {
2780                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2781                 .rpc_argp = &args,
2782                 .rpc_resp = &res,
2783                 .rpc_cred = cred,
2784         };
2785         int                     status;
2786
2787         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2788                         dentry->d_parent->d_name.name,
2789                         dentry->d_name.name,
2790                         (unsigned long long)cookie);
2791         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2792         res.pgbase = args.pgbase;
2793         status = nfs4_call_sync(NFS_SERVER(dir), &msg, &args, &res, 0);
2794         if (status == 0)
2795                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2796
2797         nfs_invalidate_atime(dir);
2798
2799         dprintk("%s: returns %d\n", __func__, status);
2800         return status;
2801 }
2802
2803 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2804                   u64 cookie, struct page *page, unsigned int count, int plus)
2805 {
2806         struct nfs4_exception exception = { };
2807         int err;
2808         do {
2809                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2810                                 _nfs4_proc_readdir(dentry, cred, cookie,
2811                                         page, count, plus),
2812                                 &exception);
2813         } while (exception.retry);
2814         return err;
2815 }
2816
2817 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2818                 struct iattr *sattr, dev_t rdev)
2819 {
2820         struct nfs4_createdata *data;
2821         int mode = sattr->ia_mode;
2822         int status = -ENOMEM;
2823
2824         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2825         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2826
2827         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2828         if (data == NULL)
2829                 goto out;
2830
2831         if (S_ISFIFO(mode))
2832                 data->arg.ftype = NF4FIFO;
2833         else if (S_ISBLK(mode)) {
2834                 data->arg.ftype = NF4BLK;
2835                 data->arg.u.device.specdata1 = MAJOR(rdev);
2836                 data->arg.u.device.specdata2 = MINOR(rdev);
2837         }
2838         else if (S_ISCHR(mode)) {
2839                 data->arg.ftype = NF4CHR;
2840                 data->arg.u.device.specdata1 = MAJOR(rdev);
2841                 data->arg.u.device.specdata2 = MINOR(rdev);
2842         }
2843
2844         status = nfs4_do_create(dir, dentry, data);
2845
2846         nfs4_free_createdata(data);
2847 out:
2848         return status;
2849 }
2850
2851 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2852                 struct iattr *sattr, dev_t rdev)
2853 {
2854         struct nfs4_exception exception = { };
2855         int err;
2856         do {
2857                 err = nfs4_handle_exception(NFS_SERVER(dir),
2858                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2859                                 &exception);
2860         } while (exception.retry);
2861         return err;
2862 }
2863
2864 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2865                  struct nfs_fsstat *fsstat)
2866 {
2867         struct nfs4_statfs_arg args = {
2868                 .fh = fhandle,
2869                 .bitmask = server->attr_bitmask,
2870         };
2871         struct nfs4_statfs_res res = {
2872                 .fsstat = fsstat,
2873         };
2874         struct rpc_message msg = {
2875                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2876                 .rpc_argp = &args,
2877                 .rpc_resp = &res,
2878         };
2879
2880         nfs_fattr_init(fsstat->fattr);
2881         return  nfs4_call_sync(server, &msg, &args, &res, 0);
2882 }
2883
2884 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2885 {
2886         struct nfs4_exception exception = { };
2887         int err;
2888         do {
2889                 err = nfs4_handle_exception(server,
2890                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2891                                 &exception);
2892         } while (exception.retry);
2893         return err;
2894 }
2895
2896 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2897                 struct nfs_fsinfo *fsinfo)
2898 {
2899         struct nfs4_fsinfo_arg args = {
2900                 .fh = fhandle,
2901                 .bitmask = server->attr_bitmask,
2902         };
2903         struct nfs4_fsinfo_res res = {
2904                 .fsinfo = fsinfo,
2905         };
2906         struct rpc_message msg = {
2907                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2908                 .rpc_argp = &args,
2909                 .rpc_resp = &res,
2910         };
2911
2912         return nfs4_call_sync(server, &msg, &args, &res, 0);
2913 }
2914
2915 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2916 {
2917         struct nfs4_exception exception = { };
2918         int err;
2919
2920         do {
2921                 err = nfs4_handle_exception(server,
2922                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2923                                 &exception);
2924         } while (exception.retry);
2925         return err;
2926 }
2927
2928 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2929 {
2930         nfs_fattr_init(fsinfo->fattr);
2931         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2932 }
2933
2934 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2935                 struct nfs_pathconf *pathconf)
2936 {
2937         struct nfs4_pathconf_arg args = {
2938                 .fh = fhandle,
2939                 .bitmask = server->attr_bitmask,
2940         };
2941         struct nfs4_pathconf_res res = {
2942                 .pathconf = pathconf,
2943         };
2944         struct rpc_message msg = {
2945                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2946                 .rpc_argp = &args,
2947                 .rpc_resp = &res,
2948         };
2949
2950         /* None of the pathconf attributes are mandatory to implement */
2951         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2952                 memset(pathconf, 0, sizeof(*pathconf));
2953                 return 0;
2954         }
2955
2956         nfs_fattr_init(pathconf->fattr);
2957         return nfs4_call_sync(server, &msg, &args, &res, 0);
2958 }
2959
2960 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2961                 struct nfs_pathconf *pathconf)
2962 {
2963         struct nfs4_exception exception = { };
2964         int err;
2965
2966         do {
2967                 err = nfs4_handle_exception(server,
2968                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2969                                 &exception);
2970         } while (exception.retry);
2971         return err;
2972 }
2973
2974 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2975 {
2976         struct nfs_server *server = NFS_SERVER(data->inode);
2977
2978         dprintk("--> %s\n", __func__);
2979
2980         /* nfs4_sequence_free_slot called in the read rpc_call_done */
2981         nfs4_sequence_done(server, &data->res.seq_res, task->tk_status);
2982
2983         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2984                 nfs4_restart_rpc(task, server->nfs_client);
2985                 return -EAGAIN;
2986         }
2987
2988         nfs_invalidate_atime(data->inode);
2989         if (task->tk_status > 0)
2990                 renew_lease(server, data->timestamp);
2991         return 0;
2992 }
2993
2994 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2995 {
2996         data->timestamp   = jiffies;
2997         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2998 }
2999
3000 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3001 {
3002         struct inode *inode = data->inode;
3003
3004         /* slot is freed in nfs_writeback_done */
3005         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3006                            task->tk_status);
3007
3008         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3009                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3010                 return -EAGAIN;
3011         }
3012         if (task->tk_status >= 0) {
3013                 renew_lease(NFS_SERVER(inode), data->timestamp);
3014                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
3015         }
3016         return 0;
3017 }
3018
3019 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3020 {
3021         struct nfs_server *server = NFS_SERVER(data->inode);
3022
3023         data->args.bitmask = server->cache_consistency_bitmask;
3024         data->res.server = server;
3025         data->timestamp   = jiffies;
3026
3027         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3028 }
3029
3030 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
3031 {
3032         struct inode *inode = data->inode;
3033
3034         nfs4_sequence_done(NFS_SERVER(inode), &data->res.seq_res,
3035                            task->tk_status);
3036         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3037                 nfs4_restart_rpc(task, NFS_SERVER(inode)->nfs_client);
3038                 return -EAGAIN;
3039         }
3040         nfs4_sequence_free_slot(NFS_SERVER(inode)->nfs_client,
3041                                 &data->res.seq_res);
3042         nfs_refresh_inode(inode, data->res.fattr);
3043         return 0;
3044 }
3045
3046 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
3047 {
3048         struct nfs_server *server = NFS_SERVER(data->inode);
3049
3050         data->args.bitmask = server->cache_consistency_bitmask;
3051         data->res.server = server;
3052         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3053 }
3054
3055 /*
3056  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3057  * standalone procedure for queueing an asynchronous RENEW.
3058  */
3059 static void nfs4_renew_done(struct rpc_task *task, void *data)
3060 {
3061         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
3062         unsigned long timestamp = (unsigned long)data;
3063
3064         if (task->tk_status < 0) {
3065                 /* Unless we're shutting down, schedule state recovery! */
3066                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) != 0)
3067                         nfs4_schedule_state_recovery(clp);
3068                 return;
3069         }
3070         spin_lock(&clp->cl_lock);
3071         if (time_before(clp->cl_last_renewal,timestamp))
3072                 clp->cl_last_renewal = timestamp;
3073         spin_unlock(&clp->cl_lock);
3074 }
3075
3076 static const struct rpc_call_ops nfs4_renew_ops = {
3077         .rpc_call_done = nfs4_renew_done,
3078 };
3079
3080 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
3081 {
3082         struct rpc_message msg = {
3083                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3084                 .rpc_argp       = clp,
3085                 .rpc_cred       = cred,
3086         };
3087
3088         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3089                         &nfs4_renew_ops, (void *)jiffies);
3090 }
3091
3092 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3093 {
3094         struct rpc_message msg = {
3095                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3096                 .rpc_argp       = clp,
3097                 .rpc_cred       = cred,
3098         };
3099         unsigned long now = jiffies;
3100         int status;
3101
3102         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3103         if (status < 0)
3104                 return status;
3105         spin_lock(&clp->cl_lock);
3106         if (time_before(clp->cl_last_renewal,now))
3107                 clp->cl_last_renewal = now;
3108         spin_unlock(&clp->cl_lock);
3109         return 0;
3110 }
3111
3112 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3113 {
3114         return (server->caps & NFS_CAP_ACLS)
3115                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3116                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3117 }
3118
3119 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
3120  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
3121  * the stack.
3122  */
3123 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
3124
3125 static void buf_to_pages(const void *buf, size_t buflen,
3126                 struct page **pages, unsigned int *pgbase)
3127 {
3128         const void *p = buf;
3129
3130         *pgbase = offset_in_page(buf);
3131         p -= *pgbase;
3132         while (p < buf + buflen) {
3133                 *(pages++) = virt_to_page(p);
3134                 p += PAGE_CACHE_SIZE;
3135         }
3136 }
3137
3138 struct nfs4_cached_acl {
3139         int cached;
3140         size_t len;
3141         char data[0];
3142 };
3143
3144 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3145 {
3146         struct nfs_inode *nfsi = NFS_I(inode);
3147
3148         spin_lock(&inode->i_lock);
3149         kfree(nfsi->nfs4_acl);
3150         nfsi->nfs4_acl = acl;
3151         spin_unlock(&inode->i_lock);
3152 }
3153
3154 static void nfs4_zap_acl_attr(struct inode *inode)
3155 {
3156         nfs4_set_cached_acl(inode, NULL);
3157 }
3158
3159 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3160 {
3161         struct nfs_inode *nfsi = NFS_I(inode);
3162         struct nfs4_cached_acl *acl;
3163         int ret = -ENOENT;
3164
3165         spin_lock(&inode->i_lock);
3166         acl = nfsi->nfs4_acl;
3167         if (acl == NULL)
3168                 goto out;
3169         if (buf == NULL) /* user is just asking for length */
3170                 goto out_len;
3171         if (acl->cached == 0)
3172                 goto out;
3173         ret = -ERANGE; /* see getxattr(2) man page */
3174         if (acl->len > buflen)
3175                 goto out;
3176         memcpy(buf, acl->data, acl->len);
3177 out_len:
3178         ret = acl->len;
3179 out:
3180         spin_unlock(&inode->i_lock);
3181         return ret;
3182 }
3183
3184 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
3185 {
3186         struct nfs4_cached_acl *acl;
3187
3188         if (buf && acl_len <= PAGE_SIZE) {
3189                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
3190                 if (acl == NULL)
3191                         goto out;
3192                 acl->cached = 1;
3193                 memcpy(acl->data, buf, acl_len);
3194         } else {
3195                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3196                 if (acl == NULL)
3197                         goto out;
3198                 acl->cached = 0;
3199         }
3200         acl->len = acl_len;
3201 out:
3202         nfs4_set_cached_acl(inode, acl);
3203 }
3204
3205 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3206 {
3207         struct page *pages[NFS4ACL_MAXPAGES];
3208         struct nfs_getaclargs args = {
3209                 .fh = NFS_FH(inode),
3210                 .acl_pages = pages,
3211                 .acl_len = buflen,
3212         };
3213         struct nfs_getaclres res = {
3214                 .acl_len = buflen,
3215         };
3216         void *resp_buf;
3217         struct rpc_message msg = {
3218                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3219                 .rpc_argp = &args,
3220                 .rpc_resp = &res,
3221         };
3222         struct page *localpage = NULL;
3223         int ret;
3224
3225         if (buflen < PAGE_SIZE) {
3226                 /* As long as we're doing a round trip to the server anyway,
3227                  * let's be prepared for a page of acl data. */
3228                 localpage = alloc_page(GFP_KERNEL);
3229                 resp_buf = page_address(localpage);
3230                 if (localpage == NULL)
3231                         return -ENOMEM;
3232                 args.acl_pages[0] = localpage;
3233                 args.acl_pgbase = 0;
3234                 args.acl_len = PAGE_SIZE;
3235         } else {
3236                 resp_buf = buf;
3237                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
3238         }
3239         ret = nfs4_call_sync(NFS_SERVER(inode), &msg, &args, &res, 0);
3240         if (ret)
3241                 goto out_free;
3242         if (res.acl_len > args.acl_len)
3243                 nfs4_write_cached_acl(inode, NULL, res.acl_len);
3244         else
3245                 nfs4_write_cached_acl(inode, resp_buf, res.acl_len);
3246         if (buf) {
3247                 ret = -ERANGE;
3248                 if (res.acl_len > buflen)
3249                         goto out_free;
3250                 if (localpage)
3251                         memcpy(buf, resp_buf, res.acl_len);
3252         }
3253         ret = res.acl_len;
3254 out_free:
3255         if (localpage)
3256                 __free_page(localpage);
3257         return ret;
3258 }
3259
3260 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3261 {
3262         struct nfs4_exception exception = { };
3263         ssize_t ret;
3264         do {
3265                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3266                 if (ret >= 0)
3267                         break;
3268                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3269         } while (exception.retry);
3270         return ret;
3271 }
3272
3273 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3274 {
3275         struct nfs_server *server = NFS_SERVER(inode);
3276         int ret;
3277
3278         if (!nfs4_server_supports_acls(server))
3279                 return -EOPNOTSUPP;
3280         ret = nfs_revalidate_inode(server, inode);
3281         if (ret < 0)
3282                 return ret;
3283         ret = nfs4_read_cached_acl(inode, buf, buflen);
3284         if (ret != -ENOENT)
3285                 return ret;
3286         return nfs4_get_acl_uncached(inode, buf, buflen);
3287 }
3288
3289 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3290 {
3291         struct nfs_server *server = NFS_SERVER(inode);
3292         struct page *pages[NFS4ACL_MAXPAGES];
3293         struct nfs_setaclargs arg = {
3294                 .fh             = NFS_FH(inode),
3295                 .acl_pages      = pages,
3296                 .acl_len        = buflen,
3297         };
3298         struct nfs_setaclres res;
3299         struct rpc_message msg = {
3300                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3301                 .rpc_argp       = &arg,
3302                 .rpc_resp       = &res,
3303         };
3304         int ret;
3305
3306         if (!nfs4_server_supports_acls(server))
3307                 return -EOPNOTSUPP;
3308         nfs_inode_return_delegation(inode);
3309         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3310         ret = nfs4_call_sync(server, &msg, &arg, &res, 1);
3311         nfs_access_zap_cache(inode);
3312         nfs_zap_acl_cache(inode);
3313         return ret;
3314 }
3315
3316 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3317 {
3318         struct nfs4_exception exception = { };
3319         int err;
3320         do {
3321                 err = nfs4_handle_exception(NFS_SERVER(inode),
3322                                 __nfs4_proc_set_acl(inode, buf, buflen),
3323                                 &exception);
3324         } while (exception.retry);
3325         return err;
3326 }
3327
3328 static int
3329 _nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs_client *clp, struct nfs4_state *state)
3330 {
3331         if (!clp || task->tk_status >= 0)
3332                 return 0;
3333         switch(task->tk_status) {
3334                 case -NFS4ERR_ADMIN_REVOKED:
3335                 case -NFS4ERR_BAD_STATEID:
3336                 case -NFS4ERR_OPENMODE:
3337                         if (state == NULL)
3338                                 break;
3339                         nfs4_state_mark_reclaim_nograce(clp, state);
3340                 case -NFS4ERR_STALE_CLIENTID:
3341                 case -NFS4ERR_STALE_STATEID:
3342                 case -NFS4ERR_EXPIRED:
3343                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3344                         nfs4_schedule_state_recovery(clp);
3345                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3346                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3347                         task->tk_status = 0;
3348                         return -EAGAIN;
3349 #if defined(CONFIG_NFS_V4_1)
3350                 case -NFS4ERR_BADSESSION:
3351                 case -NFS4ERR_BADSLOT:
3352                 case -NFS4ERR_BAD_HIGH_SLOT:
3353                 case -NFS4ERR_DEADSESSION:
3354                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3355                 case -NFS4ERR_SEQ_FALSE_RETRY:
3356                 case -NFS4ERR_SEQ_MISORDERED:
3357                         dprintk("%s ERROR %d, Reset session\n", __func__,
3358                                 task->tk_status);
3359                         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
3360                         task->tk_status = 0;
3361                         return -EAGAIN;
3362 #endif /* CONFIG_NFS_V4_1 */
3363                 case -NFS4ERR_DELAY:
3364                         if (server)
3365                                 nfs_inc_server_stats(server, NFSIOS_DELAY);
3366                 case -NFS4ERR_GRACE:
3367                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3368                         task->tk_status = 0;
3369                         return -EAGAIN;
3370                 case -NFS4ERR_OLD_STATEID:
3371                         task->tk_status = 0;
3372                         return -EAGAIN;
3373         }
3374         task->tk_status = nfs4_map_errors(task->tk_status);
3375         return 0;
3376 }
3377
3378 static int
3379 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3380 {
3381         return _nfs4_async_handle_error(task, server, server->nfs_client, state);
3382 }
3383
3384 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
3385 {
3386         nfs4_verifier sc_verifier;
3387         struct nfs4_setclientid setclientid = {
3388                 .sc_verifier = &sc_verifier,
3389                 .sc_prog = program,
3390         };
3391         struct rpc_message msg = {
3392                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
3393                 .rpc_argp = &setclientid,
3394                 .rpc_resp = clp,
3395                 .rpc_cred = cred,
3396         };
3397         __be32 *p;
3398         int loop = 0;
3399         int status;
3400
3401         p = (__be32*)sc_verifier.data;
3402         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
3403         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
3404
3405         for(;;) {
3406                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
3407                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
3408                                 clp->cl_ipaddr,
3409                                 rpc_peeraddr2str(clp->cl_rpcclient,
3410                                                         RPC_DISPLAY_ADDR),
3411                                 rpc_peeraddr2str(clp->cl_rpcclient,
3412                                                         RPC_DISPLAY_PROTO),
3413                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
3414                                 clp->cl_id_uniquifier);
3415                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
3416                                 sizeof(setclientid.sc_netid),
3417                                 rpc_peeraddr2str(clp->cl_rpcclient,
3418                                                         RPC_DISPLAY_NETID));
3419                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
3420                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
3421                                 clp->cl_ipaddr, port >> 8, port & 255);
3422
3423                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3424                 if (status != -NFS4ERR_CLID_INUSE)
3425                         break;
3426                 if (signalled())
3427                         break;
3428                 if (loop++ & 1)
3429                         ssleep(clp->cl_lease_time + 1);
3430                 else
3431                         if (++clp->cl_id_uniquifier == 0)
3432                                 break;
3433         }
3434         return status;
3435 }
3436
3437 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3438 {
3439         struct nfs_fsinfo fsinfo;
3440         struct rpc_message msg = {
3441                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
3442                 .rpc_argp = clp,
3443                 .rpc_resp = &fsinfo,
3444                 .rpc_cred = cred,
3445         };
3446         unsigned long now;
3447         int status;
3448
3449         now = jiffies;
3450         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3451         if (status == 0) {
3452                 spin_lock(&clp->cl_lock);
3453                 clp->cl_lease_time = fsinfo.lease_time * HZ;
3454                 clp->cl_last_renewal = now;
3455                 spin_unlock(&clp->cl_lock);
3456         }
3457         return status;
3458 }
3459
3460 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
3461 {
3462         long timeout = 0;
3463         int err;
3464         do {
3465                 err = _nfs4_proc_setclientid_confirm(clp, cred);
3466                 switch (err) {
3467                         case 0:
3468                                 return err;
3469                         case -NFS4ERR_RESOURCE:
3470                                 /* The IBM lawyers misread another document! */
3471                         case -NFS4ERR_DELAY:
3472                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
3473                 }
3474         } while (err == 0);
3475         return err;
3476 }
3477
3478 struct nfs4_delegreturndata {
3479         struct nfs4_delegreturnargs args;
3480         struct nfs4_delegreturnres res;
3481         struct nfs_fh fh;
3482         nfs4_stateid stateid;
3483         unsigned long timestamp;
3484         struct nfs_fattr fattr;
3485         int rpc_status;
3486 };
3487
3488 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3489 {
3490         struct nfs4_delegreturndata *data = calldata;
3491
3492         nfs4_sequence_done_free_slot(data->res.server, &data->res.seq_res,
3493                                      task->tk_status);
3494
3495         data->rpc_status = task->tk_status;
3496         if (data->rpc_status == 0)
3497                 renew_lease(data->res.server, data->timestamp);
3498 }
3499
3500 static void nfs4_delegreturn_release(void *calldata)
3501 {
3502         kfree(calldata);
3503 }
3504
3505 #if defined(CONFIG_NFS_V4_1)
3506 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
3507 {
3508         struct nfs4_delegreturndata *d_data;
3509
3510         d_data = (struct nfs4_delegreturndata *)data;
3511
3512         if (nfs4_setup_sequence(d_data->res.server->nfs_client,
3513                                 &d_data->args.seq_args,
3514                                 &d_data->res.seq_res, 1, task))
3515                 return;
3516         rpc_call_start(task);
3517 }
3518 #endif /* CONFIG_NFS_V4_1 */
3519
3520 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3521 #if defined(CONFIG_NFS_V4_1)
3522         .rpc_call_prepare = nfs4_delegreturn_prepare,
3523 #endif /* CONFIG_NFS_V4_1 */
3524         .rpc_call_done = nfs4_delegreturn_done,
3525         .rpc_release = nfs4_delegreturn_release,
3526 };
3527
3528 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3529 {
3530         struct nfs4_delegreturndata *data;
3531         struct nfs_server *server = NFS_SERVER(inode);
3532         struct rpc_task *task;
3533         struct rpc_message msg = {
3534                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3535                 .rpc_cred = cred,
3536         };
3537         struct rpc_task_setup task_setup_data = {
3538                 .rpc_client = server->client,
3539                 .rpc_message = &msg,
3540                 .callback_ops = &nfs4_delegreturn_ops,
3541                 .flags = RPC_TASK_ASYNC,
3542         };
3543         int status = 0;
3544
3545         data = kzalloc(sizeof(*data), GFP_KERNEL);
3546         if (data == NULL)
3547                 return -ENOMEM;
3548         data->args.fhandle = &data->fh;
3549         data->args.stateid = &data->stateid;
3550         data->args.bitmask = server->attr_bitmask;
3551         nfs_copy_fh(&data->fh, NFS_FH(inode));
3552         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3553         data->res.fattr = &data->fattr;
3554         data->res.server = server;
3555         data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3556         nfs_fattr_init(data->res.fattr);
3557         data->timestamp = jiffies;
3558         data->rpc_status = 0;
3559
3560         task_setup_data.callback_data = data;
3561         msg.rpc_argp = &data->args,
3562         msg.rpc_resp = &data->res,
3563         task = rpc_run_task(&task_setup_data);
3564         if (IS_ERR(task))
3565                 return PTR_ERR(task);
3566         if (!issync)
3567                 goto out;
3568         status = nfs4_wait_for_completion_rpc_task(task);
3569         if (status != 0)
3570                 goto out;
3571         status = data->rpc_status;
3572         if (status != 0)
3573                 goto out;
3574         nfs_refresh_inode(inode, &data->fattr);
3575 out:
3576         rpc_put_task(task);
3577         return status;
3578 }
3579
3580 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3581 {
3582         struct nfs_server *server = NFS_SERVER(inode);
3583         struct nfs4_exception exception = { };
3584         int err;
3585         do {
3586                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3587                 switch (err) {
3588                         case -NFS4ERR_STALE_STATEID:
3589                         case -NFS4ERR_EXPIRED:
3590                         case 0:
3591                                 return 0;
3592                 }
3593                 err = nfs4_handle_exception(server, err, &exception);
3594         } while (exception.retry);
3595         return err;
3596 }
3597
3598 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3599 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3600
3601 /*
3602  * sleep, with exponential backoff, and retry the LOCK operation.
3603  */
3604 static unsigned long
3605 nfs4_set_lock_task_retry(unsigned long timeout)
3606 {
3607         schedule_timeout_killable(timeout);
3608         timeout <<= 1;
3609         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3610                 return NFS4_LOCK_MAXTIMEOUT;
3611         return timeout;
3612 }
3613
3614 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3615 {
3616         struct inode *inode = state->inode;
3617         struct nfs_server *server = NFS_SERVER(inode);
3618         struct nfs_client *clp = server->nfs_client;
3619         struct nfs_lockt_args arg = {
3620                 .fh = NFS_FH(inode),
3621                 .fl = request,
3622         };
3623         struct nfs_lockt_res res = {
3624                 .denied = request,
3625         };
3626         struct rpc_message msg = {
3627                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3628                 .rpc_argp       = &arg,
3629                 .rpc_resp       = &res,
3630                 .rpc_cred       = state->owner->so_cred,
3631         };
3632         struct nfs4_lock_state *lsp;
3633         int status;
3634
3635         arg.lock_owner.clientid = clp->cl_clientid;
3636         status = nfs4_set_lock_state(state, request);
3637         if (status != 0)
3638                 goto out;
3639         lsp = request->fl_u.nfs4_fl.owner;
3640         arg.lock_owner.id = lsp->ls_id.id;
3641         status = nfs4_call_sync(server, &msg, &arg, &res, 1);
3642         switch (status) {
3643                 case 0:
3644                         request->fl_type = F_UNLCK;
3645                         break;
3646                 case -NFS4ERR_DENIED:
3647                         status = 0;
3648         }
3649         request->fl_ops->fl_release_private(request);
3650 out:
3651         return status;
3652 }
3653
3654 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3655 {
3656         struct nfs4_exception exception = { };
3657         int err;
3658
3659         do {
3660                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3661                                 _nfs4_proc_getlk(state, cmd, request),
3662                                 &exception);
3663         } while (exception.retry);
3664         return err;
3665 }
3666
3667 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3668 {
3669         int res = 0;
3670         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3671                 case FL_POSIX:
3672                         res = posix_lock_file_wait(file, fl);
3673                         break;
3674                 case FL_FLOCK:
3675                         res = flock_lock_file_wait(file, fl);
3676                         break;
3677                 default:
3678                         BUG();
3679         }
3680         return res;
3681 }
3682
3683 struct nfs4_unlockdata {
3684         struct nfs_locku_args arg;
3685         struct nfs_locku_res res;
3686         struct nfs4_lock_state *lsp;
3687         struct nfs_open_context *ctx;
3688         struct file_lock fl;
3689         const struct nfs_server *server;
3690         unsigned long timestamp;
3691 };
3692
3693 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3694                 struct nfs_open_context *ctx,
3695                 struct nfs4_lock_state *lsp,
3696                 struct nfs_seqid *seqid)
3697 {
3698         struct nfs4_unlockdata *p;
3699         struct inode *inode = lsp->ls_state->inode;
3700
3701         p = kzalloc(sizeof(*p), GFP_KERNEL);
3702         if (p == NULL)
3703                 return NULL;
3704         p->arg.fh = NFS_FH(inode);
3705         p->arg.fl = &p->fl;
3706         p->arg.seqid = seqid;
3707         p->res.seqid = seqid;
3708         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3709         p->arg.stateid = &lsp->ls_stateid;
3710         p->lsp = lsp;
3711         atomic_inc(&lsp->ls_count);
3712         /* Ensure we don't close file until we're done freeing locks! */
3713         p->ctx = get_nfs_open_context(ctx);
3714         memcpy(&p->fl, fl, sizeof(p->fl));
3715         p->server = NFS_SERVER(inode);
3716         return p;
3717 }
3718
3719 static void nfs4_locku_release_calldata(void *data)
3720 {
3721         struct nfs4_unlockdata *calldata = data;
3722         nfs_free_seqid(calldata->arg.seqid);
3723         nfs4_put_lock_state(calldata->lsp);
3724         put_nfs_open_context(calldata->ctx);
3725         kfree(calldata);
3726 }
3727
3728 static void nfs4_locku_done(struct rpc_task *task, void *data)
3729 {
3730         struct nfs4_unlockdata *calldata = data;
3731
3732         nfs4_sequence_done(calldata->server, &calldata->res.seq_res,
3733                            task->tk_status);
3734         if (RPC_ASSASSINATED(task))
3735                 return;
3736         switch (task->tk_status) {
3737                 case 0:
3738                         memcpy(calldata->lsp->ls_stateid.data,
3739                                         calldata->res.stateid.data,
3740                                         sizeof(calldata->lsp->ls_stateid.data));
3741                         renew_lease(calldata->server, calldata->timestamp);
3742                         break;
3743                 case -NFS4ERR_BAD_STATEID:
3744                 case -NFS4ERR_OLD_STATEID:
3745                 case -NFS4ERR_STALE_STATEID:
3746                 case -NFS4ERR_EXPIRED:
3747                         break;
3748                 default:
3749                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3750                                 nfs4_restart_rpc(task,
3751                                                 calldata->server->nfs_client);
3752         }
3753         nfs4_sequence_free_slot(calldata->server->nfs_client,
3754                                 &calldata->res.seq_res);
3755 }
3756
3757 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3758 {
3759         struct nfs4_unlockdata *calldata = data;
3760
3761         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3762                 return;
3763         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3764                 /* Note: exit _without_ running nfs4_locku_done */
3765                 task->tk_action = NULL;
3766                 return;
3767         }
3768         calldata->timestamp = jiffies;
3769         if (nfs4_setup_sequence(calldata->server->nfs_client,
3770                                 &calldata->arg.seq_args,
3771                                 &calldata->res.seq_res, 1, task))
3772                 return;
3773         rpc_call_start(task);
3774 }
3775
3776 static const struct rpc_call_ops nfs4_locku_ops = {
3777         .rpc_call_prepare = nfs4_locku_prepare,
3778         .rpc_call_done = nfs4_locku_done,
3779         .rpc_release = nfs4_locku_release_calldata,
3780 };
3781
3782 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3783                 struct nfs_open_context *ctx,
3784                 struct nfs4_lock_state *lsp,
3785                 struct nfs_seqid *seqid)
3786 {
3787         struct nfs4_unlockdata *data;
3788         struct rpc_message msg = {
3789                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3790                 .rpc_cred = ctx->cred,
3791         };
3792         struct rpc_task_setup task_setup_data = {
3793                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3794                 .rpc_message = &msg,
3795                 .callback_ops = &nfs4_locku_ops,
3796                 .workqueue = nfsiod_workqueue,
3797                 .flags = RPC_TASK_ASYNC,
3798         };
3799
3800         /* Ensure this is an unlock - when canceling a lock, the
3801          * canceled lock is passed in, and it won't be an unlock.
3802          */
3803         fl->fl_type = F_UNLCK;
3804
3805         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3806         if (data == NULL) {
3807                 nfs_free_seqid(seqid);
3808                 return ERR_PTR(-ENOMEM);
3809         }
3810
3811         msg.rpc_argp = &data->arg,
3812         msg.rpc_resp = &data->res,
3813         task_setup_data.callback_data = data;
3814         return rpc_run_task(&task_setup_data);
3815 }
3816
3817 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3818 {
3819         struct nfs_inode *nfsi = NFS_I(state->inode);
3820         struct nfs_seqid *seqid;
3821         struct nfs4_lock_state *lsp;
3822         struct rpc_task *task;
3823         int status = 0;
3824         unsigned char fl_flags = request->fl_flags;
3825
3826         status = nfs4_set_lock_state(state, request);
3827         /* Unlock _before_ we do the RPC call */
3828         request->fl_flags |= FL_EXISTS;
3829         down_read(&nfsi->rwsem);
3830         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3831                 up_read(&nfsi->rwsem);
3832                 goto out;
3833         }
3834         up_read(&nfsi->rwsem);
3835         if (status != 0)
3836                 goto out;
3837         /* Is this a delegated lock? */
3838         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3839                 goto out;
3840         lsp = request->fl_u.nfs4_fl.owner;
3841         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3842         status = -ENOMEM;
3843         if (seqid == NULL)
3844                 goto out;
3845         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3846         status = PTR_ERR(task);
3847         if (IS_ERR(task))
3848                 goto out;
3849         status = nfs4_wait_for_completion_rpc_task(task);
3850         rpc_put_task(task);
3851 out:
3852         request->fl_flags = fl_flags;
3853         return status;
3854 }
3855
3856 struct nfs4_lockdata {
3857         struct nfs_lock_args arg;
3858         struct nfs_lock_res res;
3859         struct nfs4_lock_state *lsp;
3860         struct nfs_open_context *ctx;
3861         struct file_lock fl;
3862         unsigned long timestamp;
3863         int rpc_status;
3864         int cancelled;
3865         struct nfs_server *server;
3866 };
3867
3868 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3869                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3870 {
3871         struct nfs4_lockdata *p;
3872         struct inode *inode = lsp->ls_state->inode;
3873         struct nfs_server *server = NFS_SERVER(inode);
3874
3875         p = kzalloc(sizeof(*p), GFP_KERNEL);
3876         if (p == NULL)
3877                 return NULL;
3878
3879         p->arg.fh = NFS_FH(inode);
3880         p->arg.fl = &p->fl;
3881         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3882         if (p->arg.open_seqid == NULL)
3883                 goto out_free;
3884         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3885         if (p->arg.lock_seqid == NULL)
3886                 goto out_free_seqid;
3887         p->arg.lock_stateid = &lsp->ls_stateid;
3888         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3889         p->arg.lock_owner.id = lsp->ls_id.id;
3890         p->res.lock_seqid = p->arg.lock_seqid;
3891         p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
3892         p->lsp = lsp;
3893         p->server = server;
3894         atomic_inc(&lsp->ls_count);
3895         p->ctx = get_nfs_open_context(ctx);
3896         memcpy(&p->fl, fl, sizeof(p->fl));
3897         return p;
3898 out_free_seqid:
3899         nfs_free_seqid(p->arg.open_seqid);
3900 out_free:
3901         kfree(p);
3902         return NULL;
3903 }
3904
3905 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3906 {
3907         struct nfs4_lockdata *data = calldata;
3908         struct nfs4_state *state = data->lsp->ls_state;
3909
3910         dprintk("%s: begin!\n", __func__);
3911         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3912                 return;
3913         /* Do we need to do an open_to_lock_owner? */
3914         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3915                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3916                         return;
3917                 data->arg.open_stateid = &state->stateid;
3918                 data->arg.new_lock_owner = 1;
3919                 data->res.open_seqid = data->arg.open_seqid;
3920         } else
3921                 data->arg.new_lock_owner = 0;
3922         data->timestamp = jiffies;
3923         if (nfs4_setup_sequence(data->server->nfs_client, &data->arg.seq_args,
3924                                 &data->res.seq_res, 1, task))
3925                 return;
3926         rpc_call_start(task);
3927         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3928 }
3929
3930 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3931 {
3932         struct nfs4_lockdata *data = calldata;
3933
3934         dprintk("%s: begin!\n", __func__);
3935
3936         nfs4_sequence_done_free_slot(data->server, &data->res.seq_res,
3937                                      task->tk_status);
3938
3939         data->rpc_status = task->tk_status;
3940         if (RPC_ASSASSINATED(task))
3941                 goto out;
3942         if (data->arg.new_lock_owner != 0) {
3943                 if (data->rpc_status == 0)
3944                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3945                 else
3946                         goto out;
3947         }
3948         if (data->rpc_status == 0) {
3949                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3950                                         sizeof(data->lsp->ls_stateid.data));
3951                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3952                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3953         }
3954 out:
3955         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3956 }
3957
3958 static void nfs4_lock_release(void *calldata)
3959 {
3960         struct nfs4_lockdata *data = calldata;
3961
3962         dprintk("%s: begin!\n", __func__);
3963         nfs_free_seqid(data->arg.open_seqid);
3964         if (data->cancelled != 0) {
3965                 struct rpc_task *task;
3966                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3967                                 data->arg.lock_seqid);
3968                 if (!IS_ERR(task))
3969                         rpc_put_task(task);
3970                 dprintk("%s: cancelling lock!\n", __func__);
3971         } else
3972                 nfs_free_seqid(data->arg.lock_seqid);
3973         nfs4_put_lock_state(data->lsp);
3974         put_nfs_open_context(data->ctx);
3975         kfree(data);
3976         dprintk("%s: done!\n", __func__);
3977 }
3978
3979 static const struct rpc_call_ops nfs4_lock_ops = {
3980         .rpc_call_prepare = nfs4_lock_prepare,
3981         .rpc_call_done = nfs4_lock_done,
3982         .rpc_release = nfs4_lock_release,
3983 };
3984
3985 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3986 {
3987         struct nfs4_lockdata *data;
3988         struct rpc_task *task;
3989         struct rpc_message msg = {
3990                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3991                 .rpc_cred = state->owner->so_cred,
3992         };
3993         struct rpc_task_setup task_setup_data = {
3994                 .rpc_client = NFS_CLIENT(state->inode),
3995                 .rpc_message = &msg,
3996                 .callback_ops = &nfs4_lock_ops,
3997                 .workqueue = nfsiod_workqueue,
3998                 .flags = RPC_TASK_ASYNC,
3999         };
4000         int ret;
4001
4002         dprintk("%s: begin!\n", __func__);
4003         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4004                         fl->fl_u.nfs4_fl.owner);
4005         if (data == NULL)
4006                 return -ENOMEM;
4007         if (IS_SETLKW(cmd))
4008                 data->arg.block = 1;
4009         if (reclaim != 0)
4010                 data->arg.reclaim = 1;
4011         msg.rpc_argp = &data->arg,
4012         msg.rpc_resp = &data->res,
4013         task_setup_data.callback_data = data;
4014         task = rpc_run_task(&task_setup_data);
4015         if (IS_ERR(task))
4016                 return PTR_ERR(task);
4017         ret = nfs4_wait_for_completion_rpc_task(task);
4018         if (ret == 0) {
4019                 ret = data->rpc_status;
4020         } else
4021                 data->cancelled = 1;
4022         rpc_put_task(task);
4023         dprintk("%s: done, ret = %d!\n", __func__, ret);
4024         return ret;
4025 }
4026
4027 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4028 {
4029         struct nfs_server *server = NFS_SERVER(state->inode);
4030         struct nfs4_exception exception = { };
4031         int err;
4032
4033         do {
4034                 /* Cache the lock if possible... */
4035                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4036                         return 0;
4037                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
4038                 if (err != -NFS4ERR_DELAY)
4039                         break;
4040                 nfs4_handle_exception(server, err, &exception);
4041         } while (exception.retry);
4042         return err;
4043 }
4044
4045 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4046 {
4047         struct nfs_server *server = NFS_SERVER(state->inode);
4048         struct nfs4_exception exception = { };
4049         int err;
4050
4051         err = nfs4_set_lock_state(state, request);
4052         if (err != 0)
4053                 return err;
4054         do {
4055                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4056                         return 0;
4057                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
4058                 switch (err) {
4059                 default:
4060                         goto out;
4061                 case -NFS4ERR_GRACE:
4062                 case -NFS4ERR_DELAY:
4063                         nfs4_handle_exception(server, err, &exception);
4064                         err = 0;
4065                 }
4066         } while (exception.retry);
4067 out:
4068         return err;
4069 }
4070
4071 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4072 {
4073         struct nfs_inode *nfsi = NFS_I(state->inode);
4074         unsigned char fl_flags = request->fl_flags;
4075         int status;
4076
4077         /* Is this a delegated open? */
4078         status = nfs4_set_lock_state(state, request);
4079         if (status != 0)
4080                 goto out;
4081         request->fl_flags |= FL_ACCESS;
4082         status = do_vfs_lock(request->fl_file, request);
4083         if (status < 0)
4084                 goto out;
4085         down_read(&nfsi->rwsem);
4086         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4087                 /* Yes: cache locks! */
4088                 /* ...but avoid races with delegation recall... */
4089                 request->fl_flags = fl_flags & ~FL_SLEEP;
4090                 status = do_vfs_lock(request->fl_file, request);
4091                 goto out_unlock;
4092         }
4093         status = _nfs4_do_setlk(state, cmd, request, 0);
4094         if (status != 0)
4095                 goto out_unlock;
4096         /* Note: we always want to sleep here! */
4097         request->fl_flags = fl_flags | FL_SLEEP;
4098         if (do_vfs_lock(request->fl_file, request) < 0)
4099                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
4100 out_unlock:
4101         up_read(&nfsi->rwsem);
4102 out:
4103         request->fl_flags = fl_flags;
4104         return status;
4105 }
4106
4107 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4108 {
4109         struct nfs4_exception exception = { };
4110         int err;
4111
4112         do {
4113                 err = _nfs4_proc_setlk(state, cmd, request);
4114                 if (err == -NFS4ERR_DENIED)
4115                         err = -EAGAIN;
4116                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4117                                 err, &exception);
4118         } while (exception.retry);
4119         return err;
4120 }
4121
4122 static int
4123 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4124 {
4125         struct nfs_open_context *ctx;
4126         struct nfs4_state *state;
4127         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4128         int status;
4129
4130         /* verify open state */
4131         ctx = nfs_file_open_context(filp);
4132         state = ctx->state;
4133
4134         if (request->fl_start < 0 || request->fl_end < 0)
4135                 return -EINVAL;
4136
4137         if (IS_GETLK(cmd)) {
4138                 if (state != NULL)
4139                         return nfs4_proc_getlk(state, F_GETLK, request);
4140                 return 0;
4141         }
4142
4143         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4144                 return -EINVAL;
4145
4146         if (request->fl_type == F_UNLCK) {
4147                 if (state != NULL)
4148                         return nfs4_proc_unlck(state, cmd, request);
4149                 return 0;
4150         }
4151
4152         if (state == NULL)
4153                 return -ENOLCK;
4154         do {
4155                 status = nfs4_proc_setlk(state, cmd, request);
4156                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4157                         break;
4158                 timeout = nfs4_set_lock_task_retry(timeout);
4159                 status = -ERESTARTSYS;
4160                 if (signalled())
4161                         break;
4162         } while(status < 0);
4163         return status;
4164 }
4165
4166 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4167 {
4168         struct nfs_server *server = NFS_SERVER(state->inode);
4169         struct nfs4_exception exception = { };
4170         int err;
4171
4172         err = nfs4_set_lock_state(state, fl);
4173         if (err != 0)
4174                 goto out;
4175         do {
4176                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
4177                 switch (err) {
4178                         default:
4179                                 printk(KERN_ERR "%s: unhandled error %d.\n",
4180                                                 __func__, err);
4181                         case 0:
4182                         case -ESTALE:
4183                                 goto out;
4184                         case -NFS4ERR_EXPIRED:
4185                         case -NFS4ERR_STALE_CLIENTID:
4186                         case -NFS4ERR_STALE_STATEID:
4187                                 nfs4_schedule_state_recovery(server->nfs_client);
4188                                 goto out;
4189                         case -ERESTARTSYS:
4190                                 /*
4191                                  * The show must go on: exit, but mark the
4192                                  * stateid as needing recovery.
4193                                  */
4194                         case -NFS4ERR_ADMIN_REVOKED:
4195                         case -NFS4ERR_BAD_STATEID:
4196                         case -NFS4ERR_OPENMODE:
4197                                 nfs4_state_mark_reclaim_nograce(server->nfs_client, state);
4198                                 err = 0;
4199                                 goto out;
4200                         case -ENOMEM:
4201                         case -NFS4ERR_DENIED:
4202                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4203                                 err = 0;
4204                                 goto out;
4205                         case -NFS4ERR_DELAY:
4206                                 break;
4207                 }
4208                 err = nfs4_handle_exception(server, err, &exception);
4209         } while (exception.retry);
4210 out:
4211         return err;
4212 }
4213
4214 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
4215
4216 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
4217                 size_t buflen, int flags)
4218 {
4219         struct inode *inode = dentry->d_inode;
4220
4221         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4222                 return -EOPNOTSUPP;
4223
4224         return nfs4_proc_set_acl(inode, buf, buflen);
4225 }
4226
4227 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
4228  * and that's what we'll do for e.g. user attributes that haven't been set.
4229  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
4230  * attributes in kernel-managed attribute namespaces. */
4231 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
4232                 size_t buflen)
4233 {
4234         struct inode *inode = dentry->d_inode;
4235
4236         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
4237                 return -EOPNOTSUPP;
4238
4239         return nfs4_proc_get_acl(inode, buf, buflen);
4240 }
4241
4242 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
4243 {
4244         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
4245
4246         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
4247                 return 0;
4248         if (buf && buflen < len)
4249                 return -ERANGE;
4250         if (buf)
4251                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
4252         return len;
4253 }
4254
4255 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
4256 {
4257         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
4258                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
4259                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
4260                 return;
4261
4262         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
4263                 NFS_ATTR_FATTR_NLINK;
4264         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
4265         fattr->nlink = 2;
4266 }
4267
4268 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
4269                 struct nfs4_fs_locations *fs_locations, struct page *page)
4270 {
4271         struct nfs_server *server = NFS_SERVER(dir);
4272         u32 bitmask[2] = {
4273                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
4274                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
4275         };
4276         struct nfs4_fs_locations_arg args = {
4277                 .dir_fh = NFS_FH(dir),
4278                 .name = name,
4279                 .page = page,
4280                 .bitmask = bitmask,
4281         };
4282         struct nfs4_fs_locations_res res = {
4283                 .fs_locations = fs_locations,
4284         };
4285         struct rpc_message msg = {
4286                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
4287                 .rpc_argp = &args,
4288                 .rpc_resp = &res,
4289         };
4290         int status;
4291
4292         dprintk("%s: start\n", __func__);
4293         nfs_fattr_init(&fs_locations->fattr);
4294         fs_locations->server = server;
4295         fs_locations->nlocations = 0;
4296         status = nfs4_call_sync(server, &msg, &args, &res, 0);
4297         nfs_fixup_referral_attributes(&fs_locations->fattr);
4298         dprintk("%s: returned status = %d\n", __func__, status);
4299         return status;
4300 }
4301
4302 #ifdef CONFIG_NFS_V4_1
4303 /*
4304  * nfs4_proc_exchange_id()
4305  *
4306  * Since the clientid has expired, all compounds using sessions
4307  * associated with the stale clientid will be returning
4308  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
4309  * be in some phase of session reset.
4310  */
4311 static int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
4312 {
4313         nfs4_verifier verifier;
4314         struct nfs41_exchange_id_args args = {
4315                 .client = clp,
4316                 .flags = clp->cl_exchange_flags,
4317         };
4318         struct nfs41_exchange_id_res res = {
4319                 .client = clp,
4320         };
4321         int status;
4322         struct rpc_message msg = {
4323                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
4324                 .rpc_argp = &args,
4325                 .rpc_resp = &res,
4326                 .rpc_cred = cred,
4327         };
4328         __be32 *p;
4329
4330         dprintk("--> %s\n", __func__);
4331         BUG_ON(clp == NULL);
4332
4333         p = (u32 *)verifier.data;
4334         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
4335         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
4336         args.verifier = &verifier;
4337
4338         while (1) {
4339                 args.id_len = scnprintf(args.id, sizeof(args.id),
4340                                         "%s/%s %u",
4341                                         clp->cl_ipaddr,
4342                                         rpc_peeraddr2str(clp->cl_rpcclient,
4343                                                          RPC_DISPLAY_ADDR),
4344                                         clp->cl_id_uniquifier);
4345
4346                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
4347
4348                 if (status != NFS4ERR_CLID_INUSE)
4349                         break;
4350
4351                 if (signalled())
4352                         break;
4353
4354                 if (++clp->cl_id_uniquifier == 0)
4355                         break;
4356         }
4357
4358         dprintk("<-- %s status= %d\n", __func__, status);
4359         return status;
4360 }
4361
4362 struct nfs4_get_lease_time_data {
4363         struct nfs4_get_lease_time_args *args;
4364         struct nfs4_get_lease_time_res *res;
4365         struct nfs_client *clp;
4366 };
4367
4368 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
4369                                         void *calldata)
4370 {
4371         int ret;
4372         struct nfs4_get_lease_time_data *data =
4373                         (struct nfs4_get_lease_time_data *)calldata;
4374
4375         dprintk("--> %s\n", __func__);
4376         /* just setup sequence, do not trigger session recovery
4377            since we're invoked within one */
4378         ret = nfs41_setup_sequence(data->clp->cl_session,
4379                                         &data->args->la_seq_args,
4380                                         &data->res->lr_seq_res, 0, task);
4381
4382         BUG_ON(ret == -EAGAIN);
4383         rpc_call_start(task);
4384         dprintk("<-- %s\n", __func__);
4385 }
4386
4387 /*
4388  * Called from nfs4_state_manager thread for session setup, so don't recover
4389  * from sequence operation or clientid errors.
4390  */
4391 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
4392 {
4393         struct nfs4_get_lease_time_data *data =
4394                         (struct nfs4_get_lease_time_data *)calldata;
4395
4396         dprintk("--> %s\n", __func__);
4397         nfs41_sequence_done(data->clp, &data->res->lr_seq_res, task->tk_status);
4398         switch (task->tk_status) {
4399         case -NFS4ERR_DELAY:
4400         case -NFS4ERR_GRACE:
4401                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
4402                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
4403                 task->tk_status = 0;
4404                 nfs4_restart_rpc(task, data->clp);
4405                 return;
4406         }
4407         nfs41_sequence_free_slot(data->clp, &data->res->lr_seq_res);
4408         dprintk("<-- %s\n", __func__);
4409 }
4410
4411 struct rpc_call_ops nfs4_get_lease_time_ops = {
4412         .rpc_call_prepare = nfs4_get_lease_time_prepare,
4413         .rpc_call_done = nfs4_get_lease_time_done,
4414 };
4415
4416 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
4417 {
4418         struct rpc_task *task;
4419         struct nfs4_get_lease_time_args args;
4420         struct nfs4_get_lease_time_res res = {
4421                 .lr_fsinfo = fsinfo,
4422         };
4423         struct nfs4_get_lease_time_data data = {
4424                 .args = &args,
4425                 .res = &res,
4426                 .clp = clp,
4427         };
4428         struct rpc_message msg = {
4429                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
4430                 .rpc_argp = &args,
4431                 .rpc_resp = &res,
4432         };
4433         struct rpc_task_setup task_setup = {
4434                 .rpc_client = clp->cl_rpcclient,
4435                 .rpc_message = &msg,
4436                 .callback_ops = &nfs4_get_lease_time_ops,
4437                 .callback_data = &data
4438         };
4439         int status;
4440
4441         res.lr_seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
4442         dprintk("--> %s\n", __func__);
4443         task = rpc_run_task(&task_setup);
4444
4445         if (IS_ERR(task))
4446                 status = PTR_ERR(task);
4447         else {
4448                 status = task->tk_status;
4449                 rpc_put_task(task);
4450         }
4451         dprintk("<-- %s return %d\n", __func__, status);
4452
4453         return status;
4454 }
4455
4456 /*
4457  * Reset a slot table
4458  */
4459 static int nfs4_reset_slot_table(struct nfs4_slot_table *tbl, int max_slots,
4460                 int old_max_slots, int ivalue)
4461 {
4462         int i;
4463         int ret = 0;
4464
4465         dprintk("--> %s: max_reqs=%u, tbl %p\n", __func__, max_slots, tbl);
4466
4467         /*
4468          * Until we have dynamic slot table adjustment, insist
4469          * upon the same slot table size
4470          */
4471         if (max_slots != old_max_slots) {
4472                 dprintk("%s reset slot table does't match old\n",
4473                         __func__);
4474                 ret = -EINVAL; /*XXX NFS4ERR_REQ_TOO_BIG ? */
4475                 goto out;
4476         }
4477         spin_lock(&tbl->slot_tbl_lock);
4478         for (i = 0; i < max_slots; ++i)
4479                 tbl->slots[i].seq_nr = ivalue;
4480         tbl->highest_used_slotid = -1;
4481         spin_unlock(&tbl->slot_tbl_lock);
4482         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4483                 tbl, tbl->slots, tbl->max_slots);
4484 out:
4485         dprintk("<-- %s: return %d\n", __func__, ret);
4486         return ret;
4487 }
4488
4489 /*
4490  * Reset the forechannel and backchannel slot tables
4491  */
4492 static int nfs4_reset_slot_tables(struct nfs4_session *session)
4493 {
4494         int status;
4495
4496         status = nfs4_reset_slot_table(&session->fc_slot_table,
4497                         session->fc_attrs.max_reqs,
4498                         session->fc_slot_table.max_slots,
4499                         1);
4500         if (status)
4501                 return status;
4502
4503         status = nfs4_reset_slot_table(&session->bc_slot_table,
4504                         session->bc_attrs.max_reqs,
4505                         session->bc_slot_table.max_slots,
4506                         0);
4507         return status;
4508 }
4509
4510 /* Destroy the slot table */
4511 static void nfs4_destroy_slot_tables(struct nfs4_session *session)
4512 {
4513         if (session->fc_slot_table.slots != NULL) {
4514                 kfree(session->fc_slot_table.slots);
4515                 session->fc_slot_table.slots = NULL;
4516         }
4517         if (session->bc_slot_table.slots != NULL) {
4518                 kfree(session->bc_slot_table.slots);
4519                 session->bc_slot_table.slots = NULL;
4520         }
4521         return;
4522 }
4523
4524 /*
4525  * Initialize slot table
4526  */
4527 static int nfs4_init_slot_table(struct nfs4_slot_table *tbl,
4528                 int max_slots, int ivalue)
4529 {
4530         int i;
4531         struct nfs4_slot *slot;
4532         int ret = -ENOMEM;
4533
4534         BUG_ON(max_slots > NFS4_MAX_SLOT_TABLE);
4535
4536         dprintk("--> %s: max_reqs=%u\n", __func__, max_slots);
4537
4538         slot = kcalloc(max_slots, sizeof(struct nfs4_slot), GFP_KERNEL);
4539         if (!slot)
4540                 goto out;
4541         for (i = 0; i < max_slots; ++i)
4542                 slot[i].seq_nr = ivalue;
4543         ret = 0;
4544
4545         spin_lock(&tbl->slot_tbl_lock);
4546         if (tbl->slots != NULL) {
4547                 spin_unlock(&tbl->slot_tbl_lock);
4548                 dprintk("%s: slot table already initialized. tbl=%p slots=%p\n",
4549                         __func__, tbl, tbl->slots);
4550                 WARN_ON(1);
4551                 goto out_free;
4552         }
4553         tbl->max_slots = max_slots;
4554         tbl->slots = slot;
4555         tbl->highest_used_slotid = -1;  /* no slot is currently used */
4556         spin_unlock(&tbl->slot_tbl_lock);
4557         dprintk("%s: tbl=%p slots=%p max_slots=%d\n", __func__,
4558                 tbl, tbl->slots, tbl->max_slots);
4559 out:
4560         dprintk("<-- %s: return %d\n", __func__, ret);
4561         return ret;
4562
4563 out_free:
4564         kfree(slot);
4565         goto out;
4566 }
4567
4568 /*
4569  * Initialize the forechannel and backchannel tables
4570  */
4571 static int nfs4_init_slot_tables(struct nfs4_session *session)
4572 {
4573         int status;
4574
4575         status = nfs4_init_slot_table(&session->fc_slot_table,
4576                         session->fc_attrs.max_reqs, 1);
4577         if (status)
4578                 return status;
4579
4580         status = nfs4_init_slot_table(&session->bc_slot_table,
4581                         session->bc_attrs.max_reqs, 0);
4582         if (status)
4583                 nfs4_destroy_slot_tables(session);
4584
4585         return status;
4586 }
4587
4588 struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
4589 {
4590         struct nfs4_session *session;
4591         struct nfs4_slot_table *tbl;
4592
4593         session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
4594         if (!session)
4595                 return NULL;
4596
4597         set_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state);
4598         /*
4599          * The create session reply races with the server back
4600          * channel probe. Mark the client NFS_CS_SESSION_INITING
4601          * so that the client back channel can find the
4602          * nfs_client struct
4603          */
4604         clp->cl_cons_state = NFS_CS_SESSION_INITING;
4605
4606         tbl = &session->fc_slot_table;
4607         spin_lock_init(&tbl->slot_tbl_lock);
4608         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "ForeChannel Slot table");
4609
4610         tbl = &session->bc_slot_table;
4611         spin_lock_init(&tbl->slot_tbl_lock);
4612         rpc_init_wait_queue(&tbl->slot_tbl_waitq, "BackChannel Slot table");
4613
4614         session->clp = clp;
4615         return session;
4616 }
4617
4618 void nfs4_destroy_session(struct nfs4_session *session)
4619 {
4620         nfs4_proc_destroy_session(session);
4621         dprintk("%s Destroy backchannel for xprt %p\n",
4622                 __func__, session->clp->cl_rpcclient->cl_xprt);
4623         xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
4624                                 NFS41_BC_MIN_CALLBACKS);
4625         nfs4_destroy_slot_tables(session);
4626         kfree(session);
4627 }
4628
4629 /*
4630  * Initialize the values to be used by the client in CREATE_SESSION
4631  * If nfs4_init_session set the fore channel request and response sizes,
4632  * use them.
4633  *
4634  * Set the back channel max_resp_sz_cached to zero to force the client to
4635  * always set csa_cachethis to FALSE because the current implementation
4636  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
4637  */
4638 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
4639 {
4640         struct nfs4_session *session = args->client->cl_session;
4641         unsigned int mxrqst_sz = session->fc_attrs.max_rqst_sz,
4642                      mxresp_sz = session->fc_attrs.max_resp_sz;
4643
4644         if (mxrqst_sz == 0)
4645                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
4646         if (mxresp_sz == 0)
4647                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
4648         /* Fore channel attributes */
4649         args->fc_attrs.headerpadsz = 0;
4650         args->fc_attrs.max_rqst_sz = mxrqst_sz;
4651         args->fc_attrs.max_resp_sz = mxresp_sz;
4652         args->fc_attrs.max_resp_sz_cached = mxresp_sz;
4653         args->fc_attrs.max_ops = NFS4_MAX_OPS;
4654         args->fc_attrs.max_reqs = session->clp->cl_rpcclient->cl_xprt->max_reqs;
4655
4656         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
4657                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4658                 __func__,
4659                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
4660                 args->fc_attrs.max_resp_sz_cached, args->fc_attrs.max_ops,
4661                 args->fc_attrs.max_reqs);
4662
4663         /* Back channel attributes */
4664         args->bc_attrs.headerpadsz = 0;
4665         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
4666         args->bc_attrs.max_resp_sz = PAGE_SIZE;
4667         args->bc_attrs.max_resp_sz_cached = 0;
4668         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
4669         args->bc_attrs.max_reqs = 1;
4670
4671         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
4672                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
4673                 __func__,
4674                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
4675                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
4676                 args->bc_attrs.max_reqs);
4677 }
4678
4679 static int _verify_channel_attr(char *chan, char *attr_name, u32 sent, u32 rcvd)
4680 {
4681         if (rcvd <= sent)
4682                 return 0;
4683         printk(KERN_WARNING "%s: Session INVALID: %s channel %s increased. "
4684                 "sent=%u rcvd=%u\n", __func__, chan, attr_name, sent, rcvd);
4685         return -EINVAL;
4686 }
4687
4688 #define _verify_fore_channel_attr(_name_) \
4689         _verify_channel_attr("fore", #_name_, \
4690                              args->fc_attrs._name_, \
4691                              session->fc_attrs._name_)
4692
4693 #define _verify_back_channel_attr(_name_) \
4694         _verify_channel_attr("back", #_name_, \
4695                              args->bc_attrs._name_, \
4696                              session->bc_attrs._name_)
4697
4698 /*
4699  * The server is not allowed to increase the fore channel header pad size,
4700  * maximum response size, or maximum number of operations.
4701  *
4702  * The back channel attributes are only negotiatied down: We send what the
4703  * (back channel) server insists upon.
4704  */
4705 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
4706                                      struct nfs4_session *session)
4707 {
4708         int ret = 0;
4709
4710         ret |= _verify_fore_channel_attr(headerpadsz);
4711         ret |= _verify_fore_channel_attr(max_resp_sz);
4712         ret |= _verify_fore_channel_attr(max_ops);
4713
4714         ret |= _verify_back_channel_attr(headerpadsz);
4715         ret |= _verify_back_channel_attr(max_rqst_sz);
4716         ret |= _verify_back_channel_attr(max_resp_sz);
4717         ret |= _verify_back_channel_attr(max_resp_sz_cached);
4718         ret |= _verify_back_channel_attr(max_ops);
4719         ret |= _verify_back_channel_attr(max_reqs);
4720
4721         return ret;
4722 }
4723
4724 static int _nfs4_proc_create_session(struct nfs_client *clp)
4725 {
4726         struct nfs4_session *session = clp->cl_session;
4727         struct nfs41_create_session_args args = {
4728                 .client = clp,
4729                 .cb_program = NFS4_CALLBACK,
4730         };
4731         struct nfs41_create_session_res res = {
4732                 .client = clp,
4733         };
4734         struct rpc_message msg = {
4735                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
4736                 .rpc_argp = &args,
4737                 .rpc_resp = &res,
4738         };
4739         int status;
4740
4741         nfs4_init_channel_attrs(&args);
4742         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
4743
4744         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4745
4746         if (!status)
4747                 /* Verify the session's negotiated channel_attrs values */
4748                 status = nfs4_verify_channel_attrs(&args, session);
4749         if (!status) {
4750                 /* Increment the clientid slot sequence id */
4751                 clp->cl_seqid++;
4752         }
4753
4754         return status;
4755 }
4756
4757 /*
4758  * Issues a CREATE_SESSION operation to the server.
4759  * It is the responsibility of the caller to verify the session is
4760  * expired before calling this routine.
4761  */
4762 int nfs4_proc_create_session(struct nfs_client *clp, int reset)
4763 {
4764         int status;
4765         unsigned *ptr;
4766         struct nfs_fsinfo fsinfo;
4767         struct nfs4_session *session = clp->cl_session;
4768
4769         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
4770
4771         status = _nfs4_proc_create_session(clp);
4772         if (status)
4773                 goto out;
4774
4775         /* Init or reset the fore channel */
4776         if (reset)
4777                 status = nfs4_reset_slot_tables(session);
4778         else
4779                 status = nfs4_init_slot_tables(session);
4780         dprintk("fore channel slot table initialization returned %d\n", status);
4781         if (status)
4782                 goto out;
4783
4784         ptr = (unsigned *)&session->sess_id.data[0];
4785         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
4786                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
4787
4788         if (reset)
4789                 /* Lease time is aleady set */
4790                 goto out;
4791
4792         /* Get the lease time */
4793         status = nfs4_proc_get_lease_time(clp, &fsinfo);
4794         if (status == 0) {
4795                 /* Update lease time and schedule renewal */
4796                 spin_lock(&clp->cl_lock);
4797                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4798                 clp->cl_last_renewal = jiffies;
4799                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
4800                 spin_unlock(&clp->cl_lock);
4801
4802                 nfs4_schedule_state_renewal(clp);
4803         }
4804 out:
4805         dprintk("<-- %s\n", __func__);
4806         return status;
4807 }
4808
4809 /*
4810  * Issue the over-the-wire RPC DESTROY_SESSION.
4811  * The caller must serialize access to this routine.
4812  */
4813 int nfs4_proc_destroy_session(struct nfs4_session *session)
4814 {
4815         int status = 0;
4816         struct rpc_message msg;
4817
4818         dprintk("--> nfs4_proc_destroy_session\n");
4819
4820         /* session is still being setup */
4821         if (session->clp->cl_cons_state != NFS_CS_READY)
4822                 return status;
4823
4824         msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION];
4825         msg.rpc_argp = session;
4826         msg.rpc_resp = NULL;
4827         msg.rpc_cred = NULL;
4828         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, 0);
4829
4830         if (status)
4831                 printk(KERN_WARNING
4832                         "Got error %d from the server on DESTROY_SESSION. "
4833                         "Session has been destroyed regardless...\n", status);
4834
4835         dprintk("<-- nfs4_proc_destroy_session\n");
4836         return status;
4837 }
4838
4839 int nfs4_init_session(struct nfs_server *server)
4840 {
4841         struct nfs_client *clp = server->nfs_client;
4842         int ret;
4843
4844         if (!nfs4_has_session(clp))
4845                 return 0;
4846
4847         clp->cl_session->fc_attrs.max_rqst_sz = server->wsize;
4848         clp->cl_session->fc_attrs.max_resp_sz = server->rsize;
4849         ret = nfs4_recover_expired_lease(server);
4850         if (!ret)
4851                 ret = nfs4_check_client_ready(clp);
4852         return ret;
4853 }
4854
4855 /*
4856  * Renew the cl_session lease.
4857  */
4858 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
4859 {
4860         struct nfs4_sequence_args args;
4861         struct nfs4_sequence_res res;
4862
4863         struct rpc_message msg = {
4864                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4865                 .rpc_argp = &args,
4866                 .rpc_resp = &res,
4867                 .rpc_cred = cred,
4868         };
4869
4870         args.sa_cache_this = 0;
4871
4872         return nfs4_call_sync_sequence(clp, clp->cl_rpcclient, &msg, &args,
4873                                        &res, 0);
4874 }
4875
4876 void nfs41_sequence_call_done(struct rpc_task *task, void *data)
4877 {
4878         struct nfs_client *clp = (struct nfs_client *)data;
4879
4880         nfs41_sequence_done(clp, task->tk_msg.rpc_resp, task->tk_status);
4881
4882         if (task->tk_status < 0) {
4883                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
4884
4885                 if (_nfs4_async_handle_error(task, NULL, clp, NULL)
4886                                                                 == -EAGAIN) {
4887                         nfs4_restart_rpc(task, clp);
4888                         return;
4889                 }
4890         }
4891         nfs41_sequence_free_slot(clp, task->tk_msg.rpc_resp);
4892         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
4893
4894         kfree(task->tk_msg.rpc_argp);
4895         kfree(task->tk_msg.rpc_resp);
4896
4897         dprintk("<-- %s\n", __func__);
4898 }
4899
4900 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
4901 {
4902         struct nfs_client *clp;
4903         struct nfs4_sequence_args *args;
4904         struct nfs4_sequence_res *res;
4905
4906         clp = (struct nfs_client *)data;
4907         args = task->tk_msg.rpc_argp;
4908         res = task->tk_msg.rpc_resp;
4909
4910         if (nfs4_setup_sequence(clp, args, res, 0, task))
4911                 return;
4912         rpc_call_start(task);
4913 }
4914
4915 static const struct rpc_call_ops nfs41_sequence_ops = {
4916         .rpc_call_done = nfs41_sequence_call_done,
4917         .rpc_call_prepare = nfs41_sequence_prepare,
4918 };
4919
4920 static int nfs41_proc_async_sequence(struct nfs_client *clp,
4921                                      struct rpc_cred *cred)
4922 {
4923         struct nfs4_sequence_args *args;
4924         struct nfs4_sequence_res *res;
4925         struct rpc_message msg = {
4926                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
4927                 .rpc_cred = cred,
4928         };
4929
4930         args = kzalloc(sizeof(*args), GFP_KERNEL);
4931         if (!args)
4932                 return -ENOMEM;
4933         res = kzalloc(sizeof(*res), GFP_KERNEL);
4934         if (!res) {
4935                 kfree(args);
4936                 return -ENOMEM;
4937         }
4938         res->sr_slotid = NFS4_MAX_SLOT_TABLE;
4939         msg.rpc_argp = args;
4940         msg.rpc_resp = res;
4941
4942         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
4943                               &nfs41_sequence_ops, (void *)clp);
4944 }
4945
4946 #endif /* CONFIG_NFS_V4_1 */
4947
4948 struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
4949         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4950         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4951         .recover_open   = nfs4_open_reclaim,
4952         .recover_lock   = nfs4_lock_reclaim,
4953         .establish_clid = nfs4_init_clientid,
4954         .get_clid_cred  = nfs4_get_setclientid_cred,
4955 };
4956
4957 #if defined(CONFIG_NFS_V4_1)
4958 struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
4959         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
4960         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
4961         .recover_open   = nfs4_open_reclaim,
4962         .recover_lock   = nfs4_lock_reclaim,
4963         .establish_clid = nfs4_proc_exchange_id,
4964         .get_clid_cred  = nfs4_get_exchange_id_cred,
4965 };
4966 #endif /* CONFIG_NFS_V4_1 */
4967
4968 struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
4969         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
4970         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
4971         .recover_open   = nfs4_open_expired,
4972         .recover_lock   = nfs4_lock_expired,
4973         .establish_clid = nfs4_init_clientid,
4974         .get_clid_cred  = nfs4_get_setclientid_cred,
4975 };
4976
4977 #if defined(CONFIG_NFS_V4_1)
4978 struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
4979         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
4980         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
4981         .recover_open   = nfs4_open_expired,
4982         .recover_lock   = nfs4_lock_expired,
4983         .establish_clid = nfs4_proc_exchange_id,
4984         .get_clid_cred  = nfs4_get_exchange_id_cred,
4985 };
4986 #endif /* CONFIG_NFS_V4_1 */
4987
4988 struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
4989         .sched_state_renewal = nfs4_proc_async_renew,
4990         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
4991         .renew_lease = nfs4_proc_renew,
4992 };
4993
4994 #if defined(CONFIG_NFS_V4_1)
4995 struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
4996         .sched_state_renewal = nfs41_proc_async_sequence,
4997         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
4998         .renew_lease = nfs4_proc_sequence,
4999 };
5000 #endif
5001
5002 /*
5003  * Per minor version reboot and network partition recovery ops
5004  */
5005
5006 struct nfs4_state_recovery_ops *nfs4_reboot_recovery_ops[] = {
5007         &nfs40_reboot_recovery_ops,
5008 #if defined(CONFIG_NFS_V4_1)
5009         &nfs41_reboot_recovery_ops,
5010 #endif
5011 };
5012
5013 struct nfs4_state_recovery_ops *nfs4_nograce_recovery_ops[] = {
5014         &nfs40_nograce_recovery_ops,
5015 #if defined(CONFIG_NFS_V4_1)
5016         &nfs41_nograce_recovery_ops,
5017 #endif
5018 };
5019
5020 struct nfs4_state_maintenance_ops *nfs4_state_renewal_ops[] = {
5021         &nfs40_state_renewal_ops,
5022 #if defined(CONFIG_NFS_V4_1)
5023         &nfs41_state_renewal_ops,
5024 #endif
5025 };
5026
5027 static const struct inode_operations nfs4_file_inode_operations = {
5028         .permission     = nfs_permission,
5029         .getattr        = nfs_getattr,
5030         .setattr        = nfs_setattr,
5031         .getxattr       = nfs4_getxattr,
5032         .setxattr       = nfs4_setxattr,
5033         .listxattr      = nfs4_listxattr,
5034 };
5035
5036 const struct nfs_rpc_ops nfs_v4_clientops = {
5037         .version        = 4,                    /* protocol version */
5038         .dentry_ops     = &nfs4_dentry_operations,
5039         .dir_inode_ops  = &nfs4_dir_inode_operations,
5040         .file_inode_ops = &nfs4_file_inode_operations,
5041         .getroot        = nfs4_proc_get_root,
5042         .getattr        = nfs4_proc_getattr,
5043         .setattr        = nfs4_proc_setattr,
5044         .lookupfh       = nfs4_proc_lookupfh,
5045         .lookup         = nfs4_proc_lookup,
5046         .access         = nfs4_proc_access,
5047         .readlink       = nfs4_proc_readlink,
5048         .create         = nfs4_proc_create,
5049         .remove         = nfs4_proc_remove,
5050         .unlink_setup   = nfs4_proc_unlink_setup,
5051         .unlink_done    = nfs4_proc_unlink_done,
5052         .rename         = nfs4_proc_rename,
5053         .link           = nfs4_proc_link,
5054         .symlink        = nfs4_proc_symlink,
5055         .mkdir          = nfs4_proc_mkdir,
5056         .rmdir          = nfs4_proc_remove,
5057         .readdir        = nfs4_proc_readdir,
5058         .mknod          = nfs4_proc_mknod,
5059         .statfs         = nfs4_proc_statfs,
5060         .fsinfo         = nfs4_proc_fsinfo,
5061         .pathconf       = nfs4_proc_pathconf,
5062         .set_capabilities = nfs4_server_capabilities,
5063         .decode_dirent  = nfs4_decode_dirent,
5064         .read_setup     = nfs4_proc_read_setup,
5065         .read_done      = nfs4_read_done,
5066         .write_setup    = nfs4_proc_write_setup,
5067         .write_done     = nfs4_write_done,
5068         .commit_setup   = nfs4_proc_commit_setup,
5069         .commit_done    = nfs4_commit_done,
5070         .lock           = nfs4_proc_lock,
5071         .clear_acl_cache = nfs4_zap_acl_attr,
5072         .close_context  = nfs4_close_context,
5073 };
5074
5075 /*
5076  * Local variables:
5077  *  c-basic-offset: 8
5078  * End:
5079  */