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/ratelimit.h>
  43 #include <linux/printk.h>
  44 #include <linux/slab.h>
  45 #include <linux/sunrpc/clnt.h>
  46 #include <linux/nfs.h>
  47 #include <linux/nfs4.h>
  48 #include <linux/nfs_fs.h>
  49 #include <linux/nfs_page.h>
  50 #include <linux/nfs_mount.h>
  51 #include <linux/namei.h>
  52 #include <linux/mount.h>
  53 #include <linux/module.h>
  54 #include <linux/nfs_idmap.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4session.h"
  67
  68
  69 #define NFSDBG_FACILITY         NFSDBG_PROC
  70
  71 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  72 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  73
  74 struct nfs4_opendata;
  75 static int _nfs4_proc_open(struct nfs4_opendata *data);
  76 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  77 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  78 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  79 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  80 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *);
  81 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  82 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  83                             struct nfs_fattr *fattr, struct iattr *sattr,
  84                             struct nfs4_state *state);
  85 #ifdef CONFIG_NFS_V4_1
  86 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *);
  87 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *);
  88 #endif
  89 /* Prevent leaks of NFSv4 errors into userland */
  90 static int nfs4_map_errors(int err)
  91 {
  92         if (err >= -1000)
  93                 return err;
  94         switch (err) {
  95         case -NFS4ERR_RESOURCE:
  96                 return -EREMOTEIO;
  97         case -NFS4ERR_WRONGSEC:
  98                 return -EPERM;
  99         case -NFS4ERR_BADOWNER:
 100         case -NFS4ERR_BADNAME:
 101                 return -EINVAL;
 102         case -NFS4ERR_SHARE_DENIED:
 103                 return -EACCES;
 104         case -NFS4ERR_MINOR_VERS_MISMATCH:
 105                 return -EPROTONOSUPPORT;
 106         case -NFS4ERR_ACCESS:
 107                 return -EACCES;
 108         default:
 109                 dprintk("%s could not handle NFSv4 error %d\n",
 110                                 __func__, -err);
 111                 break;
 112         }
 113         return -EIO;
 114 }
 115
 116 /*
 117  * This is our standard bitmap for GETATTR requests.
 118  */
 119 const u32 nfs4_fattr_bitmap[3] = {
 120         FATTR4_WORD0_TYPE
 121         | FATTR4_WORD0_CHANGE
 122         | FATTR4_WORD0_SIZE
 123         | FATTR4_WORD0_FSID
 124         | FATTR4_WORD0_FILEID,
 125         FATTR4_WORD1_MODE
 126         | FATTR4_WORD1_NUMLINKS
 127         | FATTR4_WORD1_OWNER
 128         | FATTR4_WORD1_OWNER_GROUP
 129         | FATTR4_WORD1_RAWDEV
 130         | FATTR4_WORD1_SPACE_USED
 131         | FATTR4_WORD1_TIME_ACCESS
 132         | FATTR4_WORD1_TIME_METADATA
 133         | FATTR4_WORD1_TIME_MODIFY
 134 };
 135
 136 static const u32 nfs4_pnfs_open_bitmap[3] = {
 137         FATTR4_WORD0_TYPE
 138         | FATTR4_WORD0_CHANGE
 139         | FATTR4_WORD0_SIZE
 140         | FATTR4_WORD0_FSID
 141         | FATTR4_WORD0_FILEID,
 142         FATTR4_WORD1_MODE
 143         | FATTR4_WORD1_NUMLINKS
 144         | FATTR4_WORD1_OWNER
 145         | FATTR4_WORD1_OWNER_GROUP
 146         | FATTR4_WORD1_RAWDEV
 147         | FATTR4_WORD1_SPACE_USED
 148         | FATTR4_WORD1_TIME_ACCESS
 149         | FATTR4_WORD1_TIME_METADATA
 150         | FATTR4_WORD1_TIME_MODIFY,
 151         FATTR4_WORD2_MDSTHRESHOLD
 152 };
 153
 154 static const u32 nfs4_open_noattr_bitmap[3] = {
 155         FATTR4_WORD0_TYPE
 156         | FATTR4_WORD0_CHANGE
 157         | FATTR4_WORD0_FILEID,
 158 };
 159
 160 const u32 nfs4_statfs_bitmap[2] = {
 161         FATTR4_WORD0_FILES_AVAIL
 162         | FATTR4_WORD0_FILES_FREE
 163         | FATTR4_WORD0_FILES_TOTAL,
 164         FATTR4_WORD1_SPACE_AVAIL
 165         | FATTR4_WORD1_SPACE_FREE
 166         | FATTR4_WORD1_SPACE_TOTAL
 167 };
 168
 169 const u32 nfs4_pathconf_bitmap[2] = {
 170         FATTR4_WORD0_MAXLINK
 171         | FATTR4_WORD0_MAXNAME,
 172         0
 173 };
 174
 175 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 176                         | FATTR4_WORD0_MAXREAD
 177                         | FATTR4_WORD0_MAXWRITE
 178                         | FATTR4_WORD0_LEASE_TIME,
 179                         FATTR4_WORD1_TIME_DELTA
 180                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 181                         FATTR4_WORD2_LAYOUT_BLKSIZE
 182 };
 183
 184 const u32 nfs4_fs_locations_bitmap[2] = {
 185         FATTR4_WORD0_TYPE
 186         | FATTR4_WORD0_CHANGE
 187         | FATTR4_WORD0_SIZE
 188         | FATTR4_WORD0_FSID
 189         | FATTR4_WORD0_FILEID
 190         | FATTR4_WORD0_FS_LOCATIONS,
 191         FATTR4_WORD1_MODE
 192         | FATTR4_WORD1_NUMLINKS
 193         | FATTR4_WORD1_OWNER
 194         | FATTR4_WORD1_OWNER_GROUP
 195         | FATTR4_WORD1_RAWDEV
 196         | FATTR4_WORD1_SPACE_USED
 197         | FATTR4_WORD1_TIME_ACCESS
 198         | FATTR4_WORD1_TIME_METADATA
 199         | FATTR4_WORD1_TIME_MODIFY
 200         | FATTR4_WORD1_MOUNTED_ON_FILEID
 201 };
 202
 203 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 204                 struct nfs4_readdir_arg *readdir)
 205 {
 206         __be32 *start, *p;
 207
 208         if (cookie > 2) {
 209                 readdir->cookie = cookie;
 210                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 211                 return;
 212         }
 213
 214         readdir->cookie = 0;
 215         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 216         if (cookie == 2)
 217                 return;
 218
 219         /*
 220          * NFSv4 servers do not return entries for '.' and '..'
 221          * Therefore, we fake these entries here.  We let '.'
 222          * have cookie 0 and '..' have cookie 1.  Note that
 223          * when talking to the server, we always send cookie 0
 224          * instead of 1 or 2.
 225          */
 226         start = p = kmap_atomic(*readdir->pages);
 227
 228         if (cookie == 0) {
 229                 *p++ = xdr_one;                                  /* next */
 230                 *p++ = xdr_zero;                   /* cookie, first word */
 231                 *p++ = xdr_one;                   /* cookie, second word */
 232                 *p++ = xdr_one;                             /* entry len */
 233                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 234                 p++;
 235                 *p++ = xdr_one;                         /* bitmap length */
 236                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 237                 *p++ = htonl(8);              /* attribute buffer length */
 238                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 239         }
 240
 241         *p++ = xdr_one;                                  /* next */
 242         *p++ = xdr_zero;                   /* cookie, first word */
 243         *p++ = xdr_two;                   /* cookie, second word */
 244         *p++ = xdr_two;                             /* entry len */
 245         memcpy(p, "..\0\0", 4);                         /* entry */
 246         p++;
 247         *p++ = xdr_one;                         /* bitmap length */
 248         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 249         *p++ = htonl(8);              /* attribute buffer length */
 250         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 251
 252         readdir->pgbase = (char *)p - (char *)start;
 253         readdir->count -= readdir->pgbase;
 254         kunmap_atomic(start);
 255 }
 256
 257 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 258 {
 259         int res = 0;
 260
 261         might_sleep();
 262
 263         if (*timeout <= 0)
 264                 *timeout = NFS4_POLL_RETRY_MIN;
 265         if (*timeout > NFS4_POLL_RETRY_MAX)
 266                 *timeout = NFS4_POLL_RETRY_MAX;
 267         freezable_schedule_timeout_killable(*timeout);
 268         if (fatal_signal_pending(current))
 269                 res = -ERESTARTSYS;
 270         *timeout <<= 1;
 271         return res;
 272 }
 273
 274 /* This is the error handling routine for processes that are allowed
 275  * to sleep.
 276  */
 277 static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 278 {
 279         struct nfs_client *clp = server->nfs_client;
 280         struct nfs4_state *state = exception->state;
 281         struct inode *inode = exception->inode;
 282         int ret = errorcode;
 283
 284         exception->retry = 0;
 285         switch(errorcode) {
 286                 case 0:
 287                         return 0;
 288                 case -NFS4ERR_OPENMODE:
 289                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 290                                 nfs4_inode_return_delegation(inode);
 291                                 exception->retry = 1;
 292                                 return 0;
 293                         }
 294                         if (state == NULL)
 295                                 break;
 296                         nfs4_schedule_stateid_recovery(server, state);
 297                         goto wait_on_recovery;
 298                 case -NFS4ERR_DELEG_REVOKED:
 299                 case -NFS4ERR_ADMIN_REVOKED:
 300                 case -NFS4ERR_BAD_STATEID:
 301                         if (state == NULL)
 302                                 break;
 303                         nfs_remove_bad_delegation(state->inode);
 304                         nfs4_schedule_stateid_recovery(server, state);
 305                         goto wait_on_recovery;
 306                 case -NFS4ERR_EXPIRED:
 307                         if (state != NULL)
 308                                 nfs4_schedule_stateid_recovery(server, state);
 309                 case -NFS4ERR_STALE_STATEID:
 310                 case -NFS4ERR_STALE_CLIENTID:
 311                         nfs4_schedule_lease_recovery(clp);
 312                         goto wait_on_recovery;
 313 #if defined(CONFIG_NFS_V4_1)
 314                 case -NFS4ERR_BADSESSION:
 315                 case -NFS4ERR_BADSLOT:
 316                 case -NFS4ERR_BAD_HIGH_SLOT:
 317                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 318                 case -NFS4ERR_DEADSESSION:
 319                 case -NFS4ERR_SEQ_FALSE_RETRY:
 320                 case -NFS4ERR_SEQ_MISORDERED:
 321                         dprintk("%s ERROR: %d Reset session\n", __func__,
 322                                 errorcode);
 323                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 324                         goto wait_on_recovery;
 325 #endif /* defined(CONFIG_NFS_V4_1) */
 326                 case -NFS4ERR_FILE_OPEN:
 327                         if (exception->timeout > HZ) {
 328                                 /* We have retried a decent amount, time to
 329                                  * fail
 330                                  */
 331                                 ret = -EBUSY;
 332                                 break;
 333                         }
 334                 case -NFS4ERR_GRACE:
 335                 case -NFS4ERR_DELAY:
 336                 case -EKEYEXPIRED:
 337                         ret = nfs4_delay(server->client, &exception->timeout);
 338                         if (ret != 0)
 339                                 break;
 340                 case -NFS4ERR_RETRY_UNCACHED_REP:
 341                 case -NFS4ERR_OLD_STATEID:
 342                         exception->retry = 1;
 343                         break;
 344                 case -NFS4ERR_BADOWNER:
 345                         /* The following works around a Linux server bug! */
 346                 case -NFS4ERR_BADNAME:
 347                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 348                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 349                                 exception->retry = 1;
 350                                 printk(KERN_WARNING "NFS: v4 server %s "
 351                                                 "does not accept raw "
 352                                                 "uid/gids. "
 353                                                 "Reenabling the idmapper.\n",
 354                                                 server->nfs_client->cl_hostname);
 355                         }
 356         }
 357         /* We failed to handle the error */
 358         return nfs4_map_errors(ret);
 359 wait_on_recovery:
 360         ret = nfs4_wait_clnt_recover(clp);
 361         if (ret == 0)
 362                 exception->retry = 1;
 363         return ret;
 364 }
 365
 366
 367 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 368 {
 369         spin_lock(&clp->cl_lock);
 370         if (time_before(clp->cl_last_renewal,timestamp))
 371                 clp->cl_last_renewal = timestamp;
 372         spin_unlock(&clp->cl_lock);
 373 }
 374
 375 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 376 {
 377         do_renew_lease(server->nfs_client, timestamp);
 378 }
 379
 380 #if defined(CONFIG_NFS_V4_1)
 381
 382 bool nfs4_set_task_privileged(struct rpc_task *task, void *dummy)
 383 {
 384         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 385         return true;
 386 }
 387
 388 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 389 {
 390         struct nfs4_session *session;
 391         struct nfs4_slot_table *tbl;
 392
 393         if (!res->sr_slot) {
 394                 /* just wake up the next guy waiting since
 395                  * we may have not consumed a slot after all */
 396                 dprintk("%s: No slot\n", __func__);
 397                 return;
 398         }
 399         tbl = res->sr_slot->table;
 400         session = tbl->session;
 401
 402         spin_lock(&tbl->slot_tbl_lock);
 403         nfs4_free_slot(tbl, res->sr_slot);
 404         if (!nfs4_session_draining(session))
 405                 rpc_wake_up_first(&tbl->slot_tbl_waitq,
 406                                 nfs4_set_task_privileged, NULL);
 407         spin_unlock(&tbl->slot_tbl_lock);
 408         res->sr_slot = NULL;
 409 }
 410
 411 static int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 412 {
 413         struct nfs4_session *session;
 414         struct nfs4_slot *slot;
 415         unsigned long timestamp;
 416         struct nfs_client *clp;
 417
 418         /*
 419          * sr_status remains 1 if an RPC level error occurred. The server
 420          * may or may not have processed the sequence operation..
 421          * Proceed as if the server received and processed the sequence
 422          * operation.
 423          */
 424         if (res->sr_status == 1)
 425                 res->sr_status = NFS_OK;
 426
 427         /* don't increment the sequence number if the task wasn't sent */
 428         if (!RPC_WAS_SENT(task))
 429                 goto out;
 430
 431         slot = res->sr_slot;
 432         session = slot->table->session;
 433
 434         /* Check the SEQUENCE operation status */
 435         switch (res->sr_status) {
 436         case 0:
 437                 /* Update the slot's sequence and clientid lease timer */
 438                 ++slot->seq_nr;
 439                 timestamp = slot->renewal_time;
 440                 clp = session->clp;
 441                 do_renew_lease(clp, timestamp);
 442                 /* Check sequence flags */
 443                 if (res->sr_status_flags != 0)
 444                         nfs4_schedule_lease_recovery(clp);
 445                 nfs41_update_target_slotid(slot->table, slot, res);
 446                 break;
 447         case -NFS4ERR_DELAY:
 448                 /* The server detected a resend of the RPC call and
 449                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 450                  * of RFC5661.
 451                  */
 452                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 453                         __func__,
 454                         slot->slot_nr,
 455                         slot->seq_nr);
 456                 goto out_retry;
 457         default:
 458                 /* Just update the slot sequence no. */
 459                 ++slot->seq_nr;
 460         }
 461 out:
 462         /* The session may be reset by one of the error handlers. */
 463         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 464         nfs41_sequence_free_slot(res);
 465         return 1;
 466 out_retry:
 467         if (!rpc_restart_call(task))
 468                 goto out;
 469         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 470         return 0;
 471 }
 472
 473 static int nfs4_sequence_done(struct rpc_task *task,
 474                                struct nfs4_sequence_res *res)
 475 {
 476         if (res->sr_slot == NULL)
 477                 return 1;
 478         return nfs41_sequence_done(task, res);
 479 }
 480
 481 static void nfs41_init_sequence(struct nfs4_sequence_args *args,
 482                 struct nfs4_sequence_res *res, int cache_reply)
 483 {
 484         args->sa_slot = NULL;
 485         args->sa_cache_this = 0;
 486         if (cache_reply)
 487                 args->sa_cache_this = 1;
 488         res->sr_slot = NULL;
 489 }
 490
 491 int nfs41_setup_sequence(struct nfs4_session *session,
 492                                 struct nfs4_sequence_args *args,
 493                                 struct nfs4_sequence_res *res,
 494                                 struct rpc_task *task)
 495 {
 496         struct nfs4_slot *slot;
 497         struct nfs4_slot_table *tbl;
 498
 499         dprintk("--> %s\n", __func__);
 500         /* slot already allocated? */
 501         if (res->sr_slot != NULL)
 502                 return 0;
 503
 504         tbl = &session->fc_slot_table;
 505
 506         task->tk_timeout = 0;
 507
 508         spin_lock(&tbl->slot_tbl_lock);
 509         if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
 510             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 511                 /* The state manager will wait until the slot table is empty */
 512                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 513                 spin_unlock(&tbl->slot_tbl_lock);
 514                 dprintk("%s session is draining\n", __func__);
 515                 return -EAGAIN;
 516         }
 517
 518         if (!rpc_queue_empty(&tbl->slot_tbl_waitq) &&
 519             !rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
 520                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 521                 spin_unlock(&tbl->slot_tbl_lock);
 522                 dprintk("%s enforce FIFO order\n", __func__);
 523                 return -EAGAIN;
 524         }
 525
 526         slot = nfs4_alloc_slot(tbl);
 527         if (IS_ERR(slot)) {
 528                 /* If out of memory, try again in 1/4 second */
 529                 if (slot == ERR_PTR(-ENOMEM))
 530                         task->tk_timeout = HZ >> 2;
 531                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 532                 spin_unlock(&tbl->slot_tbl_lock);
 533                 dprintk("<-- %s: no free slots\n", __func__);
 534                 return -EAGAIN;
 535         }
 536         spin_unlock(&tbl->slot_tbl_lock);
 537
 538         rpc_task_set_priority(task, RPC_PRIORITY_NORMAL);
 539
 540         args->sa_slot = slot;
 541
 542         dprintk("<-- %s slotid=%d seqid=%d\n", __func__,
 543                         slot->slot_nr, slot->seq_nr);
 544
 545         res->sr_slot = slot;
 546         res->sr_status_flags = 0;
 547         /*
 548          * sr_status is only set in decode_sequence, and so will remain
 549          * set to 1 if an rpc level failure occurs.
 550          */
 551         res->sr_status = 1;
 552         return 0;
 553 }
 554 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 555
 556 int nfs4_setup_sequence(const struct nfs_server *server,
 557                         struct nfs4_sequence_args *args,
 558                         struct nfs4_sequence_res *res,
 559                         struct rpc_task *task)
 560 {
 561         struct nfs4_session *session = nfs4_get_session(server);
 562         int ret = 0;
 563
 564         if (session == NULL)
 565                 goto out;
 566
 567         dprintk("--> %s clp %p session %p sr_slot %d\n",
 568                 __func__, session->clp, session, res->sr_slot ?
 569                         res->sr_slot->slot_nr : -1);
 570
 571         ret = nfs41_setup_sequence(session, args, res, task);
 572 out:
 573         dprintk("<-- %s status=%d\n", __func__, ret);
 574         return ret;
 575 }
 576
 577 struct nfs41_call_sync_data {
 578         const struct nfs_server *seq_server;
 579         struct nfs4_sequence_args *seq_args;
 580         struct nfs4_sequence_res *seq_res;
 581 };
 582
 583 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 584 {
 585         struct nfs41_call_sync_data *data = calldata;
 586
 587         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 588
 589         if (nfs4_setup_sequence(data->seq_server, data->seq_args,
 590                                 data->seq_res, task))
 591                 return;
 592         rpc_call_start(task);
 593 }
 594
 595 static void nfs41_call_priv_sync_prepare(struct rpc_task *task, void *calldata)
 596 {
 597         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
 598         nfs41_call_sync_prepare(task, calldata);
 599 }
 600
 601 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 602 {
 603         struct nfs41_call_sync_data *data = calldata;
 604
 605         nfs41_sequence_done(task, data->seq_res);
 606 }
 607
 608 static const struct rpc_call_ops nfs41_call_sync_ops = {
 609         .rpc_call_prepare = nfs41_call_sync_prepare,
 610         .rpc_call_done = nfs41_call_sync_done,
 611 };
 612
 613 static const struct rpc_call_ops nfs41_call_priv_sync_ops = {
 614         .rpc_call_prepare = nfs41_call_priv_sync_prepare,
 615         .rpc_call_done = nfs41_call_sync_done,
 616 };
 617
 618 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 619                                    struct nfs_server *server,
 620                                    struct rpc_message *msg,
 621                                    struct nfs4_sequence_args *args,
 622                                    struct nfs4_sequence_res *res,
 623                                    int privileged)
 624 {
 625         int ret;
 626         struct rpc_task *task;
 627         struct nfs41_call_sync_data data = {
 628                 .seq_server = server,
 629                 .seq_args = args,
 630                 .seq_res = res,
 631         };
 632         struct rpc_task_setup task_setup = {
 633                 .rpc_client = clnt,
 634                 .rpc_message = msg,
 635                 .callback_ops = &nfs41_call_sync_ops,
 636                 .callback_data = &data
 637         };
 638
 639         if (privileged)
 640                 task_setup.callback_ops = &nfs41_call_priv_sync_ops;
 641         task = rpc_run_task(&task_setup);
 642         if (IS_ERR(task))
 643                 ret = PTR_ERR(task);
 644         else {
 645                 ret = task->tk_status;
 646                 rpc_put_task(task);
 647         }
 648         return ret;
 649 }
 650
 651 int _nfs4_call_sync_session(struct rpc_clnt *clnt,
 652                             struct nfs_server *server,
 653                             struct rpc_message *msg,
 654                             struct nfs4_sequence_args *args,
 655                             struct nfs4_sequence_res *res,
 656                             int cache_reply)
 657 {
 658         nfs41_init_sequence(args, res, cache_reply);
 659         return nfs4_call_sync_sequence(clnt, server, msg, args, res, 0);
 660 }
 661
 662 #else
 663 static inline
 664 void nfs41_init_sequence(struct nfs4_sequence_args *args,
 665                 struct nfs4_sequence_res *res, int cache_reply)
 666 {
 667 }
 668
 669 static int nfs4_sequence_done(struct rpc_task *task,
 670                                struct nfs4_sequence_res *res)
 671 {
 672         return 1;
 673 }
 674 #endif /* CONFIG_NFS_V4_1 */
 675
 676 int _nfs4_call_sync(struct rpc_clnt *clnt,
 677                     struct nfs_server *server,
 678                     struct rpc_message *msg,
 679                     struct nfs4_sequence_args *args,
 680                     struct nfs4_sequence_res *res,
 681                     int cache_reply)
 682 {
 683         nfs41_init_sequence(args, res, cache_reply);
 684         return rpc_call_sync(clnt, msg, 0);
 685 }
 686
 687 static inline
 688 int nfs4_call_sync(struct rpc_clnt *clnt,
 689                    struct nfs_server *server,
 690                    struct rpc_message *msg,
 691                    struct nfs4_sequence_args *args,
 692                    struct nfs4_sequence_res *res,
 693                    int cache_reply)
 694 {
 695         return server->nfs_client->cl_mvops->call_sync(clnt, server, msg,
 696                                                 args, res, cache_reply);
 697 }
 698
 699 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 700 {
 701         struct nfs_inode *nfsi = NFS_I(dir);
 702
 703         spin_lock(&dir->i_lock);
 704         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 705         if (!cinfo->atomic || cinfo->before != dir->i_version)
 706                 nfs_force_lookup_revalidate(dir);
 707         dir->i_version = cinfo->after;
 708         spin_unlock(&dir->i_lock);
 709 }
 710
 711 struct nfs4_opendata {
 712         struct kref kref;
 713         struct nfs_openargs o_arg;
 714         struct nfs_openres o_res;
 715         struct nfs_open_confirmargs c_arg;
 716         struct nfs_open_confirmres c_res;
 717         struct nfs4_string owner_name;
 718         struct nfs4_string group_name;
 719         struct nfs_fattr f_attr;
 720         struct dentry *dir;
 721         struct dentry *dentry;
 722         struct nfs4_state_owner *owner;
 723         struct nfs4_state *state;
 724         struct iattr attrs;
 725         unsigned long timestamp;
 726         unsigned int rpc_done : 1;
 727         int rpc_status;
 728         int cancelled;
 729 };
 730
 731
 732 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 733 {
 734         p->o_res.f_attr = &p->f_attr;
 735         p->o_res.seqid = p->o_arg.seqid;
 736         p->c_res.seqid = p->c_arg.seqid;
 737         p->o_res.server = p->o_arg.server;
 738         p->o_res.access_request = p->o_arg.access;
 739         nfs_fattr_init(&p->f_attr);
 740         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 741 }
 742
 743 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 744                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 745                 const struct iattr *attrs,
 746                 gfp_t gfp_mask)
 747 {
 748         struct dentry *parent = dget_parent(dentry);
 749         struct inode *dir = parent->d_inode;
 750         struct nfs_server *server = NFS_SERVER(dir);
 751         struct nfs4_opendata *p;
 752
 753         p = kzalloc(sizeof(*p), gfp_mask);
 754         if (p == NULL)
 755                 goto err;
 756         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid, gfp_mask);
 757         if (p->o_arg.seqid == NULL)
 758                 goto err_free;
 759         nfs_sb_active(dentry->d_sb);
 760         p->dentry = dget(dentry);
 761         p->dir = parent;
 762         p->owner = sp;
 763         atomic_inc(&sp->so_count);
 764         p->o_arg.fh = NFS_FH(dir);
 765         p->o_arg.open_flags = flags;
 766         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 767         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
 768          * will return permission denied for all bits until close */
 769         if (!(flags & O_EXCL)) {
 770                 /* ask server to check for all possible rights as results
 771                  * are cached */
 772                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
 773                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
 774         }
 775         p->o_arg.clientid = server->nfs_client->cl_clientid;
 776         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
 777         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
 778         p->o_arg.name = &dentry->d_name;
 779         p->o_arg.server = server;
 780         p->o_arg.bitmask = server->attr_bitmask;
 781         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
 782         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 783         if (attrs != NULL && attrs->ia_valid != 0) {
 784                 __be32 verf[2];
 785
 786                 p->o_arg.u.attrs = &p->attrs;
 787                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 788
 789                 verf[0] = jiffies;
 790                 verf[1] = current->pid;
 791                 memcpy(p->o_arg.u.verifier.data, verf,
 792                                 sizeof(p->o_arg.u.verifier.data));
 793         }
 794         p->c_arg.fh = &p->o_res.fh;
 795         p->c_arg.stateid = &p->o_res.stateid;
 796         p->c_arg.seqid = p->o_arg.seqid;
 797         nfs4_init_opendata_res(p);
 798         kref_init(&p->kref);
 799         return p;
 800 err_free:
 801         kfree(p);
 802 err:
 803         dput(parent);
 804         return NULL;
 805 }
 806
 807 static void nfs4_opendata_free(struct kref *kref)
 808 {
 809         struct nfs4_opendata *p = container_of(kref,
 810                         struct nfs4_opendata, kref);
 811         struct super_block *sb = p->dentry->d_sb;
 812
 813         nfs_free_seqid(p->o_arg.seqid);
 814         if (p->state != NULL)
 815                 nfs4_put_open_state(p->state);
 816         nfs4_put_state_owner(p->owner);
 817         dput(p->dir);
 818         dput(p->dentry);
 819         nfs_sb_deactive(sb);
 820         nfs_fattr_free_names(&p->f_attr);
 821         kfree(p);
 822 }
 823
 824 static void nfs4_opendata_put(struct nfs4_opendata *p)
 825 {
 826         if (p != NULL)
 827                 kref_put(&p->kref, nfs4_opendata_free);
 828 }
 829
 830 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 831 {
 832         int ret;
 833
 834         ret = rpc_wait_for_completion_task(task);
 835         return ret;
 836 }
 837
 838 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 839 {
 840         int ret = 0;
 841
 842         if (open_mode & (O_EXCL|O_TRUNC))
 843                 goto out;
 844         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 845                 case FMODE_READ:
 846                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
 847                                 && state->n_rdonly != 0;
 848                         break;
 849                 case FMODE_WRITE:
 850                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
 851                                 && state->n_wronly != 0;
 852                         break;
 853                 case FMODE_READ|FMODE_WRITE:
 854                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
 855                                 && state->n_rdwr != 0;
 856         }
 857 out:
 858         return ret;
 859 }
 860
 861 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 862 {
 863         if (delegation == NULL)
 864                 return 0;
 865         if ((delegation->type & fmode) != fmode)
 866                 return 0;
 867         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 868                 return 0;
 869         nfs_mark_delegation_referenced(delegation);
 870         return 1;
 871 }
 872
 873 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 874 {
 875         switch (fmode) {
 876                 case FMODE_WRITE:
 877                         state->n_wronly++;
 878                         break;
 879                 case FMODE_READ:
 880                         state->n_rdonly++;
 881                         break;
 882                 case FMODE_READ|FMODE_WRITE:
 883                         state->n_rdwr++;
 884         }
 885         nfs4_state_set_mode_locked(state, state->state | fmode);
 886 }
 887
 888 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 889 {
 890         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 891                 nfs4_stateid_copy(&state->stateid, stateid);
 892         nfs4_stateid_copy(&state->open_stateid, stateid);
 893         switch (fmode) {
 894                 case FMODE_READ:
 895                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 896                         break;
 897                 case FMODE_WRITE:
 898                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 899                         break;
 900                 case FMODE_READ|FMODE_WRITE:
 901                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 902         }
 903 }
 904
 905 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 906 {
 907         write_seqlock(&state->seqlock);
 908         nfs_set_open_stateid_locked(state, stateid, fmode);
 909         write_sequnlock(&state->seqlock);
 910 }
 911
 912 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 913 {
 914         /*
 915          * Protect the call to nfs4_state_set_mode_locked and
 916          * serialise the stateid update
 917          */
 918         write_seqlock(&state->seqlock);
 919         if (deleg_stateid != NULL) {
 920                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
 921                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 922         }
 923         if (open_stateid != NULL)
 924                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 925         write_sequnlock(&state->seqlock);
 926         spin_lock(&state->owner->so_lock);
 927         update_open_stateflags(state, fmode);
 928         spin_unlock(&state->owner->so_lock);
 929 }
 930
 931 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 932 {
 933         struct nfs_inode *nfsi = NFS_I(state->inode);
 934         struct nfs_delegation *deleg_cur;
 935         int ret = 0;
 936
 937         fmode &= (FMODE_READ|FMODE_WRITE);
 938
 939         rcu_read_lock();
 940         deleg_cur = rcu_dereference(nfsi->delegation);
 941         if (deleg_cur == NULL)
 942                 goto no_delegation;
 943
 944         spin_lock(&deleg_cur->lock);
 945         if (nfsi->delegation != deleg_cur ||
 946             (deleg_cur->type & fmode) != fmode)
 947                 goto no_delegation_unlock;
 948
 949         if (delegation == NULL)
 950                 delegation = &deleg_cur->stateid;
 951         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
 952                 goto no_delegation_unlock;
 953
 954         nfs_mark_delegation_referenced(deleg_cur);
 955         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 956         ret = 1;
 957 no_delegation_unlock:
 958         spin_unlock(&deleg_cur->lock);
 959 no_delegation:
 960         rcu_read_unlock();
 961
 962         if (!ret && open_stateid != NULL) {
 963                 __update_open_stateid(state, open_stateid, NULL, fmode);
 964                 ret = 1;
 965         }
 966
 967         return ret;
 968 }
 969
 970
 971 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 972 {
 973         struct nfs_delegation *delegation;
 974
 975         rcu_read_lock();
 976         delegation = rcu_dereference(NFS_I(inode)->delegation);
 977         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 978                 rcu_read_unlock();
 979                 return;
 980         }
 981         rcu_read_unlock();
 982         nfs4_inode_return_delegation(inode);
 983 }
 984
 985 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 986 {
 987         struct nfs4_state *state = opendata->state;
 988         struct nfs_inode *nfsi = NFS_I(state->inode);
 989         struct nfs_delegation *delegation;
 990         int open_mode = opendata->o_arg.open_flags & (O_EXCL|O_TRUNC);
 991         fmode_t fmode = opendata->o_arg.fmode;
 992         nfs4_stateid stateid;
 993         int ret = -EAGAIN;
 994
 995         for (;;) {
 996                 if (can_open_cached(state, fmode, open_mode)) {
 997                         spin_lock(&state->owner->so_lock);
 998                         if (can_open_cached(state, fmode, open_mode)) {
 999                                 update_open_stateflags(state, fmode);
1000                                 spin_unlock(&state->owner->so_lock);
1001                                 goto out_return_state;
1002                         }
1003                         spin_unlock(&state->owner->so_lock);
1004                 }
1005                 rcu_read_lock();
1006                 delegation = rcu_dereference(nfsi->delegation);
1007                 if (!can_open_delegated(delegation, fmode)) {
1008                         rcu_read_unlock();
1009                         break;
1010                 }
1011                 /* Save the delegation */
1012                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1013                 rcu_read_unlock();
1014                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1015                 if (ret != 0)
1016                         goto out;
1017                 ret = -EAGAIN;
1018
1019                 /* Try to update the stateid using the delegation */
1020                 if (update_open_stateid(state, NULL, &stateid, fmode))
1021                         goto out_return_state;
1022         }
1023 out:
1024         return ERR_PTR(ret);
1025 out_return_state:
1026         atomic_inc(&state->count);
1027         return state;
1028 }
1029
1030 static void
1031 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1032 {
1033         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1034         struct nfs_delegation *delegation;
1035         int delegation_flags = 0;
1036
1037         rcu_read_lock();
1038         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1039         if (delegation)
1040                 delegation_flags = delegation->flags;
1041         rcu_read_unlock();
1042         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1043                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1044                                    "returning a delegation for "
1045                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1046                                    clp->cl_hostname);
1047         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1048                 nfs_inode_set_delegation(state->inode,
1049                                          data->owner->so_cred,
1050                                          &data->o_res);
1051         else
1052                 nfs_inode_reclaim_delegation(state->inode,
1053                                              data->owner->so_cred,
1054                                              &data->o_res);
1055 }
1056
1057 /*
1058  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1059  * and update the nfs4_state.
1060  */
1061 static struct nfs4_state *
1062 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1063 {
1064         struct inode *inode = data->state->inode;
1065         struct nfs4_state *state = data->state;
1066         int ret;
1067
1068         if (!data->rpc_done) {
1069                 ret = data->rpc_status;
1070                 goto err;
1071         }
1072
1073         ret = -ESTALE;
1074         if (!(data->f_attr.valid & NFS_ATTR_FATTR_TYPE) ||
1075             !(data->f_attr.valid & NFS_ATTR_FATTR_FILEID) ||
1076             !(data->f_attr.valid & NFS_ATTR_FATTR_CHANGE))
1077                 goto err;
1078
1079         ret = -ENOMEM;
1080         state = nfs4_get_open_state(inode, data->owner);
1081         if (state == NULL)
1082                 goto err;
1083
1084         ret = nfs_refresh_inode(inode, &data->f_attr);
1085         if (ret)
1086                 goto err;
1087
1088         if (data->o_res.delegation_type != 0)
1089                 nfs4_opendata_check_deleg(data, state);
1090         update_open_stateid(state, &data->o_res.stateid, NULL,
1091                             data->o_arg.fmode);
1092
1093         return state;
1094 err:
1095         return ERR_PTR(ret);
1096
1097 }
1098
1099 static struct nfs4_state *
1100 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1101 {
1102         struct inode *inode;
1103         struct nfs4_state *state = NULL;
1104         int ret;
1105
1106         if (!data->rpc_done) {
1107                 state = nfs4_try_open_cached(data);
1108                 goto out;
1109         }
1110
1111         ret = -EAGAIN;
1112         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1113                 goto err;
1114         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
1115         ret = PTR_ERR(inode);
1116         if (IS_ERR(inode))
1117                 goto err;
1118         ret = -ENOMEM;
1119         state = nfs4_get_open_state(inode, data->owner);
1120         if (state == NULL)
1121                 goto err_put_inode;
1122         if (data->o_res.delegation_type != 0)
1123                 nfs4_opendata_check_deleg(data, state);
1124         update_open_stateid(state, &data->o_res.stateid, NULL,
1125                         data->o_arg.fmode);
1126         iput(inode);
1127 out:
1128         return state;
1129 err_put_inode:
1130         iput(inode);
1131 err:
1132         return ERR_PTR(ret);
1133 }
1134
1135 static struct nfs4_state *
1136 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1137 {
1138         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1139                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1140         return _nfs4_opendata_to_nfs4_state(data);
1141 }
1142
1143 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1144 {
1145         struct nfs_inode *nfsi = NFS_I(state->inode);
1146         struct nfs_open_context *ctx;
1147
1148         spin_lock(&state->inode->i_lock);
1149         list_for_each_entry(ctx, &nfsi->open_files, list) {
1150                 if (ctx->state != state)
1151                         continue;
1152                 get_nfs_open_context(ctx);
1153                 spin_unlock(&state->inode->i_lock);
1154                 return ctx;
1155         }
1156         spin_unlock(&state->inode->i_lock);
1157         return ERR_PTR(-ENOENT);
1158 }
1159
1160 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
1161 {
1162         struct nfs4_opendata *opendata;
1163
1164         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0, NULL, GFP_NOFS);
1165         if (opendata == NULL)
1166                 return ERR_PTR(-ENOMEM);
1167         opendata->state = state;
1168         atomic_inc(&state->count);
1169         return opendata;
1170 }
1171
1172 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1173 {
1174         struct nfs4_state *newstate;
1175         int ret;
1176
1177         opendata->o_arg.open_flags = 0;
1178         opendata->o_arg.fmode = fmode;
1179         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1180         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1181         nfs4_init_opendata_res(opendata);
1182         ret = _nfs4_recover_proc_open(opendata);
1183         if (ret != 0)
1184                 return ret;
1185         newstate = nfs4_opendata_to_nfs4_state(opendata);
1186         if (IS_ERR(newstate))
1187                 return PTR_ERR(newstate);
1188         nfs4_close_state(newstate, fmode);
1189         *res = newstate;
1190         return 0;
1191 }
1192
1193 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1194 {
1195         struct nfs4_state *newstate;
1196         int ret;
1197
1198         /* memory barrier prior to reading state->n_* */
1199         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1200         smp_rmb();
1201         if (state->n_rdwr != 0) {
1202                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1203                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1204                 if (ret != 0)
1205                         return ret;
1206                 if (newstate != state)
1207                         return -ESTALE;
1208         }
1209         if (state->n_wronly != 0) {
1210                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1211                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1212                 if (ret != 0)
1213                         return ret;
1214                 if (newstate != state)
1215                         return -ESTALE;
1216         }
1217         if (state->n_rdonly != 0) {
1218                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1219                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1220                 if (ret != 0)
1221                         return ret;
1222                 if (newstate != state)
1223                         return -ESTALE;
1224         }
1225         /*
1226          * We may have performed cached opens for all three recoveries.
1227          * Check if we need to update the current stateid.
1228          */
1229         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1230             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1231                 write_seqlock(&state->seqlock);
1232                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1233                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1234                 write_sequnlock(&state->seqlock);
1235         }
1236         return 0;
1237 }
1238
1239 /*
1240  * OPEN_RECLAIM:
1241  *      reclaim state on the server after a reboot.
1242  */
1243 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1244 {
1245         struct nfs_delegation *delegation;
1246         struct nfs4_opendata *opendata;
1247         fmode_t delegation_type = 0;
1248         int status;
1249
1250         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1251         if (IS_ERR(opendata))
1252                 return PTR_ERR(opendata);
1253         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
1254         opendata->o_arg.fh = NFS_FH(state->inode);
1255         rcu_read_lock();
1256         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1257         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1258                 delegation_type = delegation->type;
1259         rcu_read_unlock();
1260         opendata->o_arg.u.delegation_type = delegation_type;
1261         status = nfs4_open_recover(opendata, state);
1262         nfs4_opendata_put(opendata);
1263         return status;
1264 }
1265
1266 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1267 {
1268         struct nfs_server *server = NFS_SERVER(state->inode);
1269         struct nfs4_exception exception = { };
1270         int err;
1271         do {
1272                 err = _nfs4_do_open_reclaim(ctx, state);
1273                 if (err != -NFS4ERR_DELAY)
1274                         break;
1275                 nfs4_handle_exception(server, err, &exception);
1276         } while (exception.retry);
1277         return err;
1278 }
1279
1280 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1281 {
1282         struct nfs_open_context *ctx;
1283         int ret;
1284
1285         ctx = nfs4_state_find_open_context(state);
1286         if (IS_ERR(ctx))
1287                 return PTR_ERR(ctx);
1288         ret = nfs4_do_open_reclaim(ctx, state);
1289         put_nfs_open_context(ctx);
1290         return ret;
1291 }
1292
1293 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1294 {
1295         struct nfs4_opendata *opendata;
1296         int ret;
1297
1298         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1299         if (IS_ERR(opendata))
1300                 return PTR_ERR(opendata);
1301         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
1302         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1303         ret = nfs4_open_recover(opendata, state);
1304         nfs4_opendata_put(opendata);
1305         return ret;
1306 }
1307
1308 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1309 {
1310         struct nfs4_exception exception = { };
1311         struct nfs_server *server = NFS_SERVER(state->inode);
1312         int err;
1313         do {
1314                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
1315                 switch (err) {
1316                         case 0:
1317                         case -ENOENT:
1318                         case -ESTALE:
1319                                 goto out;
1320                         case -NFS4ERR_BADSESSION:
1321                         case -NFS4ERR_BADSLOT:
1322                         case -NFS4ERR_BAD_HIGH_SLOT:
1323                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1324                         case -NFS4ERR_DEADSESSION:
1325                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1326                                 goto out;
1327                         case -NFS4ERR_STALE_CLIENTID:
1328                         case -NFS4ERR_STALE_STATEID:
1329                         case -NFS4ERR_EXPIRED:
1330                                 /* Don't recall a delegation if it was lost */
1331                                 nfs4_schedule_lease_recovery(server->nfs_client);
1332                                 goto out;
1333                         case -ERESTARTSYS:
1334                                 /*
1335                                  * The show must go on: exit, but mark the
1336                                  * stateid as needing recovery.
1337                                  */
1338                         case -NFS4ERR_DELEG_REVOKED:
1339                         case -NFS4ERR_ADMIN_REVOKED:
1340                         case -NFS4ERR_BAD_STATEID:
1341                                 nfs_inode_find_state_and_recover(state->inode,
1342                                                 stateid);
1343                                 nfs4_schedule_stateid_recovery(server, state);
1344                         case -EKEYEXPIRED:
1345                                 /*
1346                                  * User RPCSEC_GSS context has expired.
1347                                  * We cannot recover this stateid now, so
1348                                  * skip it and allow recovery thread to
1349                                  * proceed.
1350                                  */
1351                         case -ENOMEM:
1352                                 err = 0;
1353                                 goto out;
1354                 }
1355                 err = nfs4_handle_exception(server, err, &exception);
1356         } while (exception.retry);
1357 out:
1358         return err;
1359 }
1360
1361 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1362 {
1363         struct nfs4_opendata *data = calldata;
1364
1365         data->rpc_status = task->tk_status;
1366         if (data->rpc_status == 0) {
1367                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1368                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1369                 renew_lease(data->o_res.server, data->timestamp);
1370                 data->rpc_done = 1;
1371         }
1372 }
1373
1374 static void nfs4_open_confirm_release(void *calldata)
1375 {
1376         struct nfs4_opendata *data = calldata;
1377         struct nfs4_state *state = NULL;
1378
1379         /* If this request hasn't been cancelled, do nothing */
1380         if (data->cancelled == 0)
1381                 goto out_free;
1382         /* In case of error, no cleanup! */
1383         if (!data->rpc_done)
1384                 goto out_free;
1385         state = nfs4_opendata_to_nfs4_state(data);
1386         if (!IS_ERR(state))
1387                 nfs4_close_state(state, data->o_arg.fmode);
1388 out_free:
1389         nfs4_opendata_put(data);
1390 }
1391
1392 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1393         .rpc_call_done = nfs4_open_confirm_done,
1394         .rpc_release = nfs4_open_confirm_release,
1395 };
1396
1397 /*
1398  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1399  */
1400 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1401 {
1402         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
1403         struct rpc_task *task;
1404         struct  rpc_message msg = {
1405                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1406                 .rpc_argp = &data->c_arg,
1407                 .rpc_resp = &data->c_res,
1408                 .rpc_cred = data->owner->so_cred,
1409         };
1410         struct rpc_task_setup task_setup_data = {
1411                 .rpc_client = server->client,
1412                 .rpc_message = &msg,
1413                 .callback_ops = &nfs4_open_confirm_ops,
1414                 .callback_data = data,
1415                 .workqueue = nfsiod_workqueue,
1416                 .flags = RPC_TASK_ASYNC,
1417         };
1418         int status;
1419
1420         kref_get(&data->kref);
1421         data->rpc_done = 0;
1422         data->rpc_status = 0;
1423         data->timestamp = jiffies;
1424         task = rpc_run_task(&task_setup_data);
1425         if (IS_ERR(task))
1426                 return PTR_ERR(task);
1427         status = nfs4_wait_for_completion_rpc_task(task);
1428         if (status != 0) {
1429                 data->cancelled = 1;
1430                 smp_wmb();
1431         } else
1432                 status = data->rpc_status;
1433         rpc_put_task(task);
1434         return status;
1435 }
1436
1437 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1438 {
1439         struct nfs4_opendata *data = calldata;
1440         struct nfs4_state_owner *sp = data->owner;
1441
1442         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1443                 return;
1444         /*
1445          * Check if we still need to send an OPEN call, or if we can use
1446          * a delegation instead.
1447          */
1448         if (data->state != NULL) {
1449                 struct nfs_delegation *delegation;
1450
1451                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1452                         goto out_no_action;
1453                 rcu_read_lock();
1454                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1455                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1456                     can_open_delegated(delegation, data->o_arg.fmode))
1457                         goto unlock_no_action;
1458                 rcu_read_unlock();
1459         }
1460         /* Update client id. */
1461         data->o_arg.clientid = sp->so_server->nfs_client->cl_clientid;
1462         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
1463                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1464                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1465                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1466         }
1467         data->timestamp = jiffies;
1468         if (nfs4_setup_sequence(data->o_arg.server,
1469                                 &data->o_arg.seq_args,
1470                                 &data->o_res.seq_res,
1471                                 task) != 0)
1472                 nfs_release_seqid(data->o_arg.seqid);
1473         else
1474                 rpc_call_start(task);
1475         return;
1476 unlock_no_action:
1477         rcu_read_unlock();
1478 out_no_action:
1479         task->tk_action = NULL;
1480
1481 }
1482
1483 static void nfs4_recover_open_prepare(struct rpc_task *task, void *calldata)
1484 {
1485         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
1486         nfs4_open_prepare(task, calldata);
1487 }
1488
1489 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1490 {
1491         struct nfs4_opendata *data = calldata;
1492
1493         data->rpc_status = task->tk_status;
1494
1495         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1496                 return;
1497
1498         if (task->tk_status == 0) {
1499                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1500                         switch (data->o_res.f_attr->mode & S_IFMT) {
1501                         case S_IFREG:
1502                                 break;
1503                         case S_IFLNK:
1504                                 data->rpc_status = -ELOOP;
1505                                 break;
1506                         case S_IFDIR:
1507                                 data->rpc_status = -EISDIR;
1508                                 break;
1509                         default:
1510                                 data->rpc_status = -ENOTDIR;
1511                         }
1512                 }
1513                 renew_lease(data->o_res.server, data->timestamp);
1514                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1515                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1516         }
1517         data->rpc_done = 1;
1518 }
1519
1520 static void nfs4_open_release(void *calldata)
1521 {
1522         struct nfs4_opendata *data = calldata;
1523         struct nfs4_state *state = NULL;
1524
1525         /* If this request hasn't been cancelled, do nothing */
1526         if (data->cancelled == 0)
1527                 goto out_free;
1528         /* In case of error, no cleanup! */
1529         if (data->rpc_status != 0 || !data->rpc_done)
1530                 goto out_free;
1531         /* In case we need an open_confirm, no cleanup! */
1532         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1533                 goto out_free;
1534         state = nfs4_opendata_to_nfs4_state(data);
1535         if (!IS_ERR(state))
1536                 nfs4_close_state(state, data->o_arg.fmode);
1537 out_free:
1538         nfs4_opendata_put(data);
1539 }
1540
1541 static const struct rpc_call_ops nfs4_open_ops = {
1542         .rpc_call_prepare = nfs4_open_prepare,
1543         .rpc_call_done = nfs4_open_done,
1544         .rpc_release = nfs4_open_release,
1545 };
1546
1547 static const struct rpc_call_ops nfs4_recover_open_ops = {
1548         .rpc_call_prepare = nfs4_recover_open_prepare,
1549         .rpc_call_done = nfs4_open_done,
1550         .rpc_release = nfs4_open_release,
1551 };
1552
1553 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1554 {
1555         struct inode *dir = data->dir->d_inode;
1556         struct nfs_server *server = NFS_SERVER(dir);
1557         struct nfs_openargs *o_arg = &data->o_arg;
1558         struct nfs_openres *o_res = &data->o_res;
1559         struct rpc_task *task;
1560         struct rpc_message msg = {
1561                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1562                 .rpc_argp = o_arg,
1563                 .rpc_resp = o_res,
1564                 .rpc_cred = data->owner->so_cred,
1565         };
1566         struct rpc_task_setup task_setup_data = {
1567                 .rpc_client = server->client,
1568                 .rpc_message = &msg,
1569                 .callback_ops = &nfs4_open_ops,
1570                 .callback_data = data,
1571                 .workqueue = nfsiod_workqueue,
1572                 .flags = RPC_TASK_ASYNC,
1573         };
1574         int status;
1575
1576         nfs41_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1577         kref_get(&data->kref);
1578         data->rpc_done = 0;
1579         data->rpc_status = 0;
1580         data->cancelled = 0;
1581         if (isrecover)
1582                 task_setup_data.callback_ops = &nfs4_recover_open_ops;
1583         task = rpc_run_task(&task_setup_data);
1584         if (IS_ERR(task))
1585                 return PTR_ERR(task);
1586         status = nfs4_wait_for_completion_rpc_task(task);
1587         if (status != 0) {
1588                 data->cancelled = 1;
1589                 smp_wmb();
1590         } else
1591                 status = data->rpc_status;
1592         rpc_put_task(task);
1593
1594         return status;
1595 }
1596
1597 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
1598 {
1599         struct inode *dir = data->dir->d_inode;
1600         struct nfs_openres *o_res = &data->o_res;
1601         int status;
1602
1603         status = nfs4_run_open_task(data, 1);
1604         if (status != 0 || !data->rpc_done)
1605                 return status;
1606
1607         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
1608
1609         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1610                 status = _nfs4_proc_open_confirm(data);
1611                 if (status != 0)
1612                         return status;
1613         }
1614
1615         return status;
1616 }
1617
1618 static int nfs4_opendata_access(struct rpc_cred *cred,
1619                                 struct nfs4_opendata *opendata,
1620                                 struct nfs4_state *state, fmode_t fmode)
1621 {
1622         struct nfs_access_entry cache;
1623         u32 mask;
1624
1625         /* access call failed or for some reason the server doesn't
1626          * support any access modes -- defer access call until later */
1627         if (opendata->o_res.access_supported == 0)
1628                 return 0;
1629
1630         mask = 0;
1631         /* don't check MAY_WRITE - a newly created file may not have
1632          * write mode bits, but POSIX allows the creating process to write */
1633         if (fmode & FMODE_READ)
1634                 mask |= MAY_READ;
1635         if (fmode & FMODE_EXEC)
1636                 mask |= MAY_EXEC;
1637
1638         cache.cred = cred;
1639         cache.jiffies = jiffies;
1640         nfs_access_set_mask(&cache, opendata->o_res.access_result);
1641         nfs_access_add_cache(state->inode, &cache);
1642
1643         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
1644                 return 0;
1645
1646         /* even though OPEN succeeded, access is denied. Close the file */
1647         nfs4_close_state(state, fmode);
1648         return -EACCES;
1649 }
1650
1651 /*
1652  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1653  */
1654 static int _nfs4_proc_open(struct nfs4_opendata *data)
1655 {
1656         struct inode *dir = data->dir->d_inode;
1657         struct nfs_server *server = NFS_SERVER(dir);
1658         struct nfs_openargs *o_arg = &data->o_arg;
1659         struct nfs_openres *o_res = &data->o_res;
1660         int status;
1661
1662         status = nfs4_run_open_task(data, 0);
1663         if (!data->rpc_done)
1664                 return status;
1665         if (status != 0) {
1666                 if (status == -NFS4ERR_BADNAME &&
1667                                 !(o_arg->open_flags & O_CREAT))
1668                         return -ENOENT;
1669                 return status;
1670         }
1671
1672         nfs_fattr_map_and_free_names(server, &data->f_attr);
1673
1674         if (o_arg->open_flags & O_CREAT)
1675                 update_changeattr(dir, &o_res->cinfo);
1676         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
1677                 server->caps &= ~NFS_CAP_POSIX_LOCK;
1678         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1679                 status = _nfs4_proc_open_confirm(data);
1680                 if (status != 0)
1681                         return status;
1682         }
1683         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1684                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1685         return 0;
1686 }
1687
1688 static int nfs4_recover_expired_lease(struct nfs_server *server)
1689 {
1690         return nfs4_client_recover_expired_lease(server->nfs_client);
1691 }
1692
1693 /*
1694  * OPEN_EXPIRED:
1695  *      reclaim state on the server after a network partition.
1696  *      Assumes caller holds the appropriate lock
1697  */
1698 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1699 {
1700         struct nfs4_opendata *opendata;
1701         int ret;
1702
1703         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1704         if (IS_ERR(opendata))
1705                 return PTR_ERR(opendata);
1706         ret = nfs4_open_recover(opendata, state);
1707         if (ret == -ESTALE)
1708                 d_drop(ctx->dentry);
1709         nfs4_opendata_put(opendata);
1710         return ret;
1711 }
1712
1713 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1714 {
1715         struct nfs_server *server = NFS_SERVER(state->inode);
1716         struct nfs4_exception exception = { };
1717         int err;
1718
1719         do {
1720                 err = _nfs4_open_expired(ctx, state);
1721                 switch (err) {
1722                 default:
1723                         goto out;
1724                 case -NFS4ERR_GRACE:
1725                 case -NFS4ERR_DELAY:
1726                         nfs4_handle_exception(server, err, &exception);
1727                         err = 0;
1728                 }
1729         } while (exception.retry);
1730 out:
1731         return err;
1732 }
1733
1734 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1735 {
1736         struct nfs_open_context *ctx;
1737         int ret;
1738
1739         ctx = nfs4_state_find_open_context(state);
1740         if (IS_ERR(ctx))
1741                 return PTR_ERR(ctx);
1742         ret = nfs4_do_open_expired(ctx, state);
1743         put_nfs_open_context(ctx);
1744         return ret;
1745 }
1746
1747 #if defined(CONFIG_NFS_V4_1)
1748 static void nfs41_clear_delegation_stateid(struct nfs4_state *state)
1749 {
1750         struct nfs_server *server = NFS_SERVER(state->inode);
1751         nfs4_stateid *stateid = &state->stateid;
1752         int status;
1753
1754         /* If a state reset has been done, test_stateid is unneeded */
1755         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1756                 return;
1757
1758         status = nfs41_test_stateid(server, stateid);
1759         if (status != NFS_OK) {
1760                 /* Free the stateid unless the server explicitly
1761                  * informs us the stateid is unrecognized. */
1762                 if (status != -NFS4ERR_BAD_STATEID)
1763                         nfs41_free_stateid(server, stateid);
1764                 nfs_remove_bad_delegation(state->inode);
1765
1766                 write_seqlock(&state->seqlock);
1767                 nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1768                 write_sequnlock(&state->seqlock);
1769                 clear_bit(NFS_DELEGATED_STATE, &state->flags);
1770         }
1771 }
1772
1773 /**
1774  * nfs41_check_open_stateid - possibly free an open stateid
1775  *
1776  * @state: NFSv4 state for an inode
1777  *
1778  * Returns NFS_OK if recovery for this stateid is now finished.
1779  * Otherwise a negative NFS4ERR value is returned.
1780  */
1781 static int nfs41_check_open_stateid(struct nfs4_state *state)
1782 {
1783         struct nfs_server *server = NFS_SERVER(state->inode);
1784         nfs4_stateid *stateid = &state->open_stateid;
1785         int status;
1786
1787         /* If a state reset has been done, test_stateid is unneeded */
1788         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
1789             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
1790             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
1791                 return -NFS4ERR_BAD_STATEID;
1792
1793         status = nfs41_test_stateid(server, stateid);
1794         if (status != NFS_OK) {
1795                 /* Free the stateid unless the server explicitly
1796                  * informs us the stateid is unrecognized. */
1797                 if (status != -NFS4ERR_BAD_STATEID)
1798                         nfs41_free_stateid(server, stateid);
1799
1800                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1801                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1802                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
1803         }
1804         return status;
1805 }
1806
1807 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1808 {
1809         int status;
1810
1811         nfs41_clear_delegation_stateid(state);
1812         status = nfs41_check_open_stateid(state);
1813         if (status != NFS_OK)
1814                 status = nfs4_open_expired(sp, state);
1815         return status;
1816 }
1817 #endif
1818
1819 /*
1820  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1821  * fields corresponding to attributes that were used to store the verifier.
1822  * Make sure we clobber those fields in the later setattr call
1823  */
1824 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1825 {
1826         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1827             !(sattr->ia_valid & ATTR_ATIME_SET))
1828                 sattr->ia_valid |= ATTR_ATIME;
1829
1830         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1831             !(sattr->ia_valid & ATTR_MTIME_SET))
1832                 sattr->ia_valid |= ATTR_MTIME;
1833 }
1834
1835 /*
1836  * Returns a referenced nfs4_state
1837  */
1838 static int _nfs4_do_open(struct inode *dir,
1839                         struct dentry *dentry,
1840                         fmode_t fmode,
1841                         int flags,
1842                         struct iattr *sattr,
1843                         struct rpc_cred *cred,
1844                         struct nfs4_state **res,
1845                         struct nfs4_threshold **ctx_th)
1846 {
1847         struct nfs4_state_owner  *sp;
1848         struct nfs4_state     *state = NULL;
1849         struct nfs_server       *server = NFS_SERVER(dir);
1850         struct nfs4_opendata *opendata;
1851         int status;
1852
1853         /* Protect against reboot recovery conflicts */
1854         status = -ENOMEM;
1855         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
1856         if (sp == NULL) {
1857                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1858                 goto out_err;
1859         }
1860         status = nfs4_recover_expired_lease(server);
1861         if (status != 0)
1862                 goto err_put_state_owner;
1863         if (dentry->d_inode != NULL)
1864                 nfs4_return_incompatible_delegation(dentry->d_inode, fmode);
1865         status = -ENOMEM;
1866         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr, GFP_KERNEL);
1867         if (opendata == NULL)
1868                 goto err_put_state_owner;
1869
1870         if (ctx_th && server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
1871                 opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
1872                 if (!opendata->f_attr.mdsthreshold)
1873                         goto err_opendata_put;
1874                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
1875         }
1876         if (dentry->d_inode != NULL)
1877                 opendata->state = nfs4_get_open_state(dentry->d_inode, sp);
1878
1879         status = _nfs4_proc_open(opendata);
1880         if (status != 0)
1881                 goto err_opendata_put;
1882
1883         state = nfs4_opendata_to_nfs4_state(opendata);
1884         status = PTR_ERR(state);
1885         if (IS_ERR(state))
1886                 goto err_opendata_put;
1887         if (server->caps & NFS_CAP_POSIX_LOCK)
1888                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
1889
1890         status = nfs4_opendata_access(cred, opendata, state, fmode);
1891         if (status != 0)
1892                 goto err_opendata_put;
1893
1894         if (opendata->o_arg.open_flags & O_EXCL) {
1895                 nfs4_exclusive_attrset(opendata, sattr);
1896
1897                 nfs_fattr_init(opendata->o_res.f_attr);
1898                 status = nfs4_do_setattr(state->inode, cred,
1899                                 opendata->o_res.f_attr, sattr,
1900                                 state);
1901                 if (status == 0)
1902                         nfs_setattr_update_inode(state->inode, sattr);
1903                 nfs_post_op_update_inode(state->inode, opendata->o_res.f_attr);
1904         }
1905
1906         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server))
1907                 *ctx_th = opendata->f_attr.mdsthreshold;
1908         else
1909                 kfree(opendata->f_attr.mdsthreshold);
1910         opendata->f_attr.mdsthreshold = NULL;
1911
1912         nfs4_opendata_put(opendata);
1913         nfs4_put_state_owner(sp);
1914         *res = state;
1915         return 0;
1916 err_opendata_put:
1917         kfree(opendata->f_attr.mdsthreshold);
1918         nfs4_opendata_put(opendata);
1919 err_put_state_owner:
1920         nfs4_put_state_owner(sp);
1921 out_err:
1922         *res = NULL;
1923         return status;
1924 }
1925
1926
1927 static struct nfs4_state *nfs4_do_open(struct inode *dir,
1928                                         struct dentry *dentry,
1929                                         fmode_t fmode,
1930                                         int flags,
1931                                         struct iattr *sattr,
1932                                         struct rpc_cred *cred,
1933                                         struct nfs4_threshold **ctx_th)
1934 {
1935         struct nfs4_exception exception = { };
1936         struct nfs4_state *res;
1937         int status;
1938
1939         fmode &= FMODE_READ|FMODE_WRITE|FMODE_EXEC;
1940         do {
1941                 status = _nfs4_do_open(dir, dentry, fmode, flags, sattr, cred,
1942                                        &res, ctx_th);
1943                 if (status == 0)
1944                         break;
1945                 /* NOTE: BAD_SEQID means the server and client disagree about the
1946                  * book-keeping w.r.t. state-changing operations
1947                  * (OPEN/CLOSE/LOCK/LOCKU...)
1948                  * It is actually a sign of a bug on the client or on the server.
1949                  *
1950                  * If we receive a BAD_SEQID error in the particular case of
1951                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1952                  * have unhashed the old state_owner for us, and that we can
1953                  * therefore safely retry using a new one. We should still warn
1954                  * the user though...
1955                  */
1956                 if (status == -NFS4ERR_BAD_SEQID) {
1957                         pr_warn_ratelimited("NFS: v4 server %s "
1958                                         " returned a bad sequence-id error!\n",
1959                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1960                         exception.retry = 1;
1961                         continue;
1962                 }
1963                 /*
1964                  * BAD_STATEID on OPEN means that the server cancelled our
1965                  * state before it received the OPEN_CONFIRM.
1966                  * Recover by retrying the request as per the discussion
1967                  * on Page 181 of RFC3530.
1968                  */
1969                 if (status == -NFS4ERR_BAD_STATEID) {
1970                         exception.retry = 1;
1971                         continue;
1972                 }
1973                 if (status == -EAGAIN) {
1974                         /* We must have found a delegation */
1975                         exception.retry = 1;
1976                         continue;
1977                 }
1978                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1979                                         status, &exception));
1980         } while (exception.retry);
1981         return res;
1982 }
1983
1984 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1985                             struct nfs_fattr *fattr, struct iattr *sattr,
1986                             struct nfs4_state *state)
1987 {
1988         struct nfs_server *server = NFS_SERVER(inode);
1989         struct nfs_setattrargs  arg = {
1990                 .fh             = NFS_FH(inode),
1991                 .iap            = sattr,
1992                 .server         = server,
1993                 .bitmask = server->attr_bitmask,
1994         };
1995         struct nfs_setattrres  res = {
1996                 .fattr          = fattr,
1997                 .server         = server,
1998         };
1999         struct rpc_message msg = {
2000                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2001                 .rpc_argp       = &arg,
2002                 .rpc_resp       = &res,
2003                 .rpc_cred       = cred,
2004         };
2005         unsigned long timestamp = jiffies;
2006         int status;
2007
2008         nfs_fattr_init(fattr);
2009
2010         if (state != NULL) {
2011                 struct nfs_lockowner lockowner = {
2012                         .l_owner = current->files,
2013                         .l_pid = current->tgid,
2014                 };
2015                 nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2016                                 &lockowner);
2017         } else if (nfs4_copy_delegation_stateid(&arg.stateid, inode,
2018                                 FMODE_WRITE)) {
2019                 /* Use that stateid */
2020         } else
2021                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2022
2023         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2024         if (status == 0 && state != NULL)
2025                 renew_lease(server, timestamp);
2026         return status;
2027 }
2028
2029 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2030                            struct nfs_fattr *fattr, struct iattr *sattr,
2031                            struct nfs4_state *state)
2032 {
2033         struct nfs_server *server = NFS_SERVER(inode);
2034         struct nfs4_exception exception = {
2035                 .state = state,
2036                 .inode = inode,
2037         };
2038         int err;
2039         do {
2040                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state);
2041                 switch (err) {
2042                 case -NFS4ERR_OPENMODE:
2043                         if (state && !(state->state & FMODE_WRITE)) {
2044                                 err = -EBADF;
2045                                 if (sattr->ia_valid & ATTR_OPEN)
2046                                         err = -EACCES;
2047                                 goto out;
2048                         }
2049                 }
2050                 err = nfs4_handle_exception(server, err, &exception);
2051         } while (exception.retry);
2052 out:
2053         return err;
2054 }
2055
2056 struct nfs4_closedata {
2057         struct inode *inode;
2058         struct nfs4_state *state;
2059         struct nfs_closeargs arg;
2060         struct nfs_closeres res;
2061         struct nfs_fattr fattr;
2062         unsigned long timestamp;
2063         bool roc;
2064         u32 roc_barrier;
2065 };
2066
2067 static void nfs4_free_closedata(void *data)
2068 {
2069         struct nfs4_closedata *calldata = data;
2070         struct nfs4_state_owner *sp = calldata->state->owner;
2071         struct super_block *sb = calldata->state->inode->i_sb;
2072
2073         if (calldata->roc)
2074                 pnfs_roc_release(calldata->state->inode);
2075         nfs4_put_open_state(calldata->state);
2076         nfs_free_seqid(calldata->arg.seqid);
2077         nfs4_put_state_owner(sp);
2078         nfs_sb_deactive_async(sb);
2079         kfree(calldata);
2080 }
2081
2082 static void nfs4_close_clear_stateid_flags(struct nfs4_state *state,
2083                 fmode_t fmode)
2084 {
2085         spin_lock(&state->owner->so_lock);
2086         if (!(fmode & FMODE_READ))
2087                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2088         if (!(fmode & FMODE_WRITE))
2089                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2090         clear_bit(NFS_O_RDWR_STATE, &state->flags);
2091         spin_unlock(&state->owner->so_lock);
2092 }
2093
2094 static void nfs4_close_done(struct rpc_task *task, void *data)
2095 {
2096         struct nfs4_closedata *calldata = data;
2097         struct nfs4_state *state = calldata->state;
2098         struct nfs_server *server = NFS_SERVER(calldata->inode);
2099
2100         dprintk("%s: begin!\n", __func__);
2101         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2102                 return;
2103         /* hmm. we are done with the inode, and in the process of freeing
2104          * the state_owner. we keep this around to process errors
2105          */
2106         switch (task->tk_status) {
2107                 case 0:
2108                         if (calldata->roc)
2109                                 pnfs_roc_set_barrier(state->inode,
2110                                                      calldata->roc_barrier);
2111                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
2112                         renew_lease(server, calldata->timestamp);
2113                         nfs4_close_clear_stateid_flags(state,
2114                                         calldata->arg.fmode);
2115                         break;
2116                 case -NFS4ERR_STALE_STATEID:
2117                 case -NFS4ERR_OLD_STATEID:
2118                 case -NFS4ERR_BAD_STATEID:
2119                 case -NFS4ERR_EXPIRED:
2120                         if (calldata->arg.fmode == 0)
2121                                 break;
2122                 default:
2123                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
2124                                 rpc_restart_call_prepare(task);
2125         }
2126         nfs_release_seqid(calldata->arg.seqid);
2127         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2128         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2129 }
2130
2131 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2132 {
2133         struct nfs4_closedata *calldata = data;
2134         struct nfs4_state *state = calldata->state;
2135         struct inode *inode = calldata->inode;
2136         int call_close = 0;
2137
2138         dprintk("%s: begin!\n", __func__);
2139         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2140                 return;
2141
2142         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2143         calldata->arg.fmode = FMODE_READ|FMODE_WRITE;
2144         spin_lock(&state->owner->so_lock);
2145         /* Calculate the change in open mode */
2146         if (state->n_rdwr == 0) {
2147                 if (state->n_rdonly == 0) {
2148                         call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags);
2149                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2150                         calldata->arg.fmode &= ~FMODE_READ;
2151                 }
2152                 if (state->n_wronly == 0) {
2153                         call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags);
2154                         call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags);
2155                         calldata->arg.fmode &= ~FMODE_WRITE;
2156                 }
2157         }
2158         spin_unlock(&state->owner->so_lock);
2159
2160         if (!call_close) {
2161                 /* Note: exit _without_ calling nfs4_close_done */
2162                 task->tk_action = NULL;
2163                 goto out;
2164         }
2165
2166         if (calldata->arg.fmode == 0) {
2167                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2168                 if (calldata->roc &&
2169                     pnfs_roc_drain(inode, &calldata->roc_barrier, task))
2170                         goto out;
2171         }
2172
2173         nfs_fattr_init(calldata->res.fattr);
2174         calldata->timestamp = jiffies;
2175         if (nfs4_setup_sequence(NFS_SERVER(inode),
2176                                 &calldata->arg.seq_args,
2177                                 &calldata->res.seq_res,
2178                                 task) != 0)
2179                 nfs_release_seqid(calldata->arg.seqid);
2180         else
2181                 rpc_call_start(task);
2182 out:
2183         dprintk("%s: done!\n", __func__);
2184 }
2185
2186 static const struct rpc_call_ops nfs4_close_ops = {
2187         .rpc_call_prepare = nfs4_close_prepare,
2188         .rpc_call_done = nfs4_close_done,
2189         .rpc_release = nfs4_free_closedata,
2190 };
2191
2192 /*
2193  * It is possible for data to be read/written from a mem-mapped file
2194  * after the sys_close call (which hits the vfs layer as a flush).
2195  * This means that we can't safely call nfsv4 close on a file until
2196  * the inode is cleared. This in turn means that we are not good
2197  * NFSv4 citizens - we do not indicate to the server to update the file's
2198  * share state even when we are done with one of the three share
2199  * stateid's in the inode.
2200  *
2201  * NOTE: Caller must be holding the sp->so_owner semaphore!
2202  */
2203 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2204 {
2205         struct nfs_server *server = NFS_SERVER(state->inode);
2206         struct nfs4_closedata *calldata;
2207         struct nfs4_state_owner *sp = state->owner;
2208         struct rpc_task *task;
2209         struct rpc_message msg = {
2210                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2211                 .rpc_cred = state->owner->so_cred,
2212         };
2213         struct rpc_task_setup task_setup_data = {
2214                 .rpc_client = server->client,
2215                 .rpc_message = &msg,
2216                 .callback_ops = &nfs4_close_ops,
2217                 .workqueue = nfsiod_workqueue,
2218                 .flags = RPC_TASK_ASYNC,
2219         };
2220         int status = -ENOMEM;
2221
2222         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2223         if (calldata == NULL)
2224                 goto out;
2225         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2226         calldata->inode = state->inode;
2227         calldata->state = state;
2228         calldata->arg.fh = NFS_FH(state->inode);
2229         calldata->arg.stateid = &state->open_stateid;
2230         /* Serialization for the sequence id */
2231         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid, gfp_mask);
2232         if (calldata->arg.seqid == NULL)
2233                 goto out_free_calldata;
2234         calldata->arg.fmode = 0;
2235         calldata->arg.bitmask = server->cache_consistency_bitmask;
2236         calldata->res.fattr = &calldata->fattr;
2237         calldata->res.seqid = calldata->arg.seqid;
2238         calldata->res.server = server;
2239         calldata->roc = pnfs_roc(state->inode);
2240         nfs_sb_active(calldata->inode->i_sb);
2241
2242         msg.rpc_argp = &calldata->arg;
2243         msg.rpc_resp = &calldata->res;
2244         task_setup_data.callback_data = calldata;
2245         task = rpc_run_task(&task_setup_data);
2246         if (IS_ERR(task))
2247                 return PTR_ERR(task);
2248         status = 0;
2249         if (wait)
2250                 status = rpc_wait_for_completion_task(task);
2251         rpc_put_task(task);
2252         return status;
2253 out_free_calldata:
2254         kfree(calldata);
2255 out:
2256         nfs4_put_open_state(state);
2257         nfs4_put_state_owner(sp);
2258         return status;
2259 }
2260
2261 static struct inode *
2262 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx, int open_flags, struct iattr *attr)
2263 {
2264         struct nfs4_state *state;
2265
2266         /* Protect against concurrent sillydeletes */
2267         state = nfs4_do_open(dir, ctx->dentry, ctx->mode, open_flags, attr,
2268                              ctx->cred, &ctx->mdsthreshold);
2269         if (IS_ERR(state))
2270                 return ERR_CAST(state);
2271         ctx->state = state;
2272         return igrab(state->inode);
2273 }
2274
2275 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2276 {
2277         if (ctx->state == NULL)
2278                 return;
2279         if (is_sync)
2280                 nfs4_close_sync(ctx->state, ctx->mode);
2281         else
2282                 nfs4_close_state(ctx->state, ctx->mode);
2283 }
2284
2285 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2286 {
2287         struct nfs4_server_caps_arg args = {
2288                 .fhandle = fhandle,
2289         };
2290         struct nfs4_server_caps_res res = {};
2291         struct rpc_message msg = {
2292                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2293                 .rpc_argp = &args,
2294                 .rpc_resp = &res,
2295         };
2296         int status;
2297
2298         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2299         if (status == 0) {
2300                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2301                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2302                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2303                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2304                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2305                                 NFS_CAP_CTIME|NFS_CAP_MTIME);
2306                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
2307                         server->caps |= NFS_CAP_ACLS;
2308                 if (res.has_links != 0)
2309                         server->caps |= NFS_CAP_HARDLINKS;
2310                 if (res.has_symlinks != 0)
2311                         server->caps |= NFS_CAP_SYMLINKS;
2312                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2313                         server->caps |= NFS_CAP_FILEID;
2314                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2315                         server->caps |= NFS_CAP_MODE;
2316                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2317                         server->caps |= NFS_CAP_NLINK;
2318                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2319                         server->caps |= NFS_CAP_OWNER;
2320                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2321                         server->caps |= NFS_CAP_OWNER_GROUP;
2322                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2323                         server->caps |= NFS_CAP_ATIME;
2324                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2325                         server->caps |= NFS_CAP_CTIME;
2326                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2327                         server->caps |= NFS_CAP_MTIME;
2328
2329                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2330                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2331                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2332                 server->acl_bitmask = res.acl_bitmask;
2333                 server->fh_expire_type = res.fh_expire_type;
2334         }
2335
2336         return status;
2337 }
2338
2339 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2340 {
2341         struct nfs4_exception exception = { };
2342         int err;
2343         do {
2344                 err = nfs4_handle_exception(server,
2345                                 _nfs4_server_capabilities(server, fhandle),
2346                                 &exception);
2347         } while (exception.retry);
2348         return err;
2349 }
2350
2351 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2352                 struct nfs_fsinfo *info)
2353 {
2354         struct nfs4_lookup_root_arg args = {
2355                 .bitmask = nfs4_fattr_bitmap,
2356         };
2357         struct nfs4_lookup_res res = {
2358                 .server = server,
2359                 .fattr = info->fattr,
2360                 .fh = fhandle,
2361         };
2362         struct rpc_message msg = {
2363                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2364                 .rpc_argp = &args,
2365                 .rpc_resp = &res,
2366         };
2367
2368         nfs_fattr_init(info->fattr);
2369         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2370 }
2371
2372 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2373                 struct nfs_fsinfo *info)
2374 {
2375         struct nfs4_exception exception = { };
2376         int err;
2377         do {
2378                 err = _nfs4_lookup_root(server, fhandle, info);
2379                 switch (err) {
2380                 case 0:
2381                 case -NFS4ERR_WRONGSEC:
2382                         goto out;
2383                 default:
2384                         err = nfs4_handle_exception(server, err, &exception);
2385                 }
2386         } while (exception.retry);
2387 out:
2388         return err;
2389 }
2390
2391 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2392                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
2393 {
2394         struct rpc_auth *auth;
2395         int ret;
2396
2397         auth = rpcauth_create(flavor, server->client);
2398         if (IS_ERR(auth)) {
2399                 ret = -EIO;
2400                 goto out;
2401         }
2402         ret = nfs4_lookup_root(server, fhandle, info);
2403 out:
2404         return ret;
2405 }
2406
2407 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
2408                               struct nfs_fsinfo *info)
2409 {
2410         int i, len, status = 0;
2411         rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];
2412
2413         len = rpcauth_list_flavors(flav_array, ARRAY_SIZE(flav_array));
2414         if (len < 0)
2415                 return len;
2416
2417         for (i = 0; i < len; i++) {
2418                 /* AUTH_UNIX is the default flavor if none was specified,
2419                  * thus has already been tried. */
2420                 if (flav_array[i] == RPC_AUTH_UNIX)
2421                         continue;
2422
2423                 status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
2424                 if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
2425                         continue;
2426                 break;
2427         }
2428         /*
2429          * -EACCESS could mean that the user doesn't have correct permissions
2430          * to access the mount.  It could also mean that we tried to mount
2431          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
2432          * existing mount programs don't handle -EACCES very well so it should
2433          * be mapped to -EPERM instead.
2434          */
2435         if (status == -EACCES)
2436                 status = -EPERM;
2437         return status;
2438 }
2439
2440 /*
2441  * get the file handle for the "/" directory on the server
2442  */
2443 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
2444                          struct nfs_fsinfo *info)
2445 {
2446         int minor_version = server->nfs_client->cl_minorversion;
2447         int status = nfs4_lookup_root(server, fhandle, info);
2448         if ((status == -NFS4ERR_WRONGSEC) && !(server->flags & NFS_MOUNT_SECFLAVOUR))
2449                 /*
2450                  * A status of -NFS4ERR_WRONGSEC will be mapped to -EPERM
2451                  * by nfs4_map_errors() as this function exits.
2452                  */
2453                 status = nfs_v4_minor_ops[minor_version]->find_root_sec(server, fhandle, info);
2454         if (status == 0)
2455                 status = nfs4_server_capabilities(server, fhandle);
2456         if (status == 0)
2457                 status = nfs4_do_fsinfo(server, fhandle, info);
2458         return nfs4_map_errors(status);
2459 }
2460
2461 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
2462                               struct nfs_fsinfo *info)
2463 {
2464         int error;
2465         struct nfs_fattr *fattr = info->fattr;
2466
2467         error = nfs4_server_capabilities(server, mntfh);
2468         if (error < 0) {
2469                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
2470                 return error;
2471         }
2472
2473         error = nfs4_proc_getattr(server, mntfh, fattr);
2474         if (error < 0) {
2475                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
2476                 return error;
2477         }
2478
2479         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
2480             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
2481                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
2482
2483         return error;
2484 }
2485
2486 /*
2487  * Get locations and (maybe) other attributes of a referral.
2488  * Note that we'll actually follow the referral later when
2489  * we detect fsid mismatch in inode revalidation
2490  */
2491 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
2492                              const struct qstr *name, struct nfs_fattr *fattr,
2493                              struct nfs_fh *fhandle)
2494 {
2495         int status = -ENOMEM;
2496         struct page *page = NULL;
2497         struct nfs4_fs_locations *locations = NULL;
2498
2499         page = alloc_page(GFP_KERNEL);
2500         if (page == NULL)
2501                 goto out;
2502         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
2503         if (locations == NULL)
2504                 goto out;
2505
2506         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
2507         if (status != 0)
2508                 goto out;
2509         /* Make sure server returned a different fsid for the referral */
2510         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
2511                 dprintk("%s: server did not return a different fsid for"
2512                         " a referral at %s\n", __func__, name->name);
2513                 status = -EIO;
2514                 goto out;
2515         }
2516         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
2517         nfs_fixup_referral_attributes(&locations->fattr);
2518
2519         /* replace the lookup nfs_fattr with the locations nfs_fattr */
2520         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
2521         memset(fhandle, 0, sizeof(struct nfs_fh));
2522 out:
2523         if (page)
2524                 __free_page(page);
2525         kfree(locations);
2526         return status;
2527 }
2528
2529 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2530 {
2531         struct nfs4_getattr_arg args = {
2532                 .fh = fhandle,
2533                 .bitmask = server->attr_bitmask,
2534         };
2535         struct nfs4_getattr_res res = {
2536                 .fattr = fattr,
2537                 .server = server,
2538         };
2539         struct rpc_message msg = {
2540                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
2541                 .rpc_argp = &args,
2542                 .rpc_resp = &res,
2543         };
2544
2545         nfs_fattr_init(fattr);
2546         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2547 }
2548
2549 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2550 {
2551         struct nfs4_exception exception = { };
2552         int err;
2553         do {
2554                 err = nfs4_handle_exception(server,
2555                                 _nfs4_proc_getattr(server, fhandle, fattr),
2556                                 &exception);
2557         } while (exception.retry);
2558         return err;
2559 }
2560
2561 /*
2562  * The file is not closed if it is opened due to the a request to change
2563  * the size of the file. The open call will not be needed once the
2564  * VFS layer lookup-intents are implemented.
2565  *
2566  * Close is called when the inode is destroyed.
2567  * If we haven't opened the file for O_WRONLY, we
2568  * need to in the size_change case to obtain a stateid.
2569  *
2570  * Got race?
2571  * Because OPEN is always done by name in nfsv4, it is
2572  * possible that we opened a different file by the same
2573  * name.  We can recognize this race condition, but we
2574  * can't do anything about it besides returning an error.
2575  *
2576  * This will be fixed with VFS changes (lookup-intent).
2577  */
2578 static int
2579 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
2580                   struct iattr *sattr)
2581 {
2582         struct inode *inode = dentry->d_inode;
2583         struct rpc_cred *cred = NULL;
2584         struct nfs4_state *state = NULL;
2585         int status;
2586
2587         if (pnfs_ld_layoutret_on_setattr(inode))
2588                 pnfs_return_layout(inode);
2589
2590         nfs_fattr_init(fattr);
2591
2592         /* Deal with open(O_TRUNC) */
2593         if (sattr->ia_valid & ATTR_OPEN)
2594                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME|ATTR_OPEN);
2595
2596         /* Optimization: if the end result is no change, don't RPC */
2597         if ((sattr->ia_valid & ~(ATTR_FILE)) == 0)
2598                 return 0;
2599
2600         /* Search for an existing open(O_WRITE) file */
2601         if (sattr->ia_valid & ATTR_FILE) {
2602                 struct nfs_open_context *ctx;
2603
2604                 ctx = nfs_file_open_context(sattr->ia_file);
2605                 if (ctx) {
2606                         cred = ctx->cred;
2607                         state = ctx->state;
2608                 }
2609         }
2610
2611         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
2612         if (status == 0)
2613                 nfs_setattr_update_inode(inode, sattr);
2614         return status;
2615 }
2616
2617 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
2618                 const struct qstr *name, struct nfs_fh *fhandle,
2619                 struct nfs_fattr *fattr)
2620 {
2621         struct nfs_server *server = NFS_SERVER(dir);
2622         int                    status;
2623         struct nfs4_lookup_arg args = {
2624                 .bitmask = server->attr_bitmask,
2625                 .dir_fh = NFS_FH(dir),
2626                 .name = name,
2627         };
2628         struct nfs4_lookup_res res = {
2629                 .server = server,
2630                 .fattr = fattr,
2631                 .fh = fhandle,
2632         };
2633         struct rpc_message msg = {
2634                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
2635                 .rpc_argp = &args,
2636                 .rpc_resp = &res,
2637         };
2638
2639         nfs_fattr_init(fattr);
2640
2641         dprintk("NFS call  lookup %s\n", name->name);
2642         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
2643         dprintk("NFS reply lookup: %d\n", status);
2644         return status;
2645 }
2646
2647 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
2648 {
2649         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
2650                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
2651         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
2652         fattr->nlink = 2;
2653 }
2654
2655 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
2656                                    struct qstr *name, struct nfs_fh *fhandle,
2657                                    struct nfs_fattr *fattr)
2658 {
2659         struct nfs4_exception exception = { };
2660         struct rpc_clnt *client = *clnt;
2661         int err;
2662         do {
2663                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr);
2664                 switch (err) {
2665                 case -NFS4ERR_BADNAME:
2666                         err = -ENOENT;
2667                         goto out;
2668                 case -NFS4ERR_MOVED:
2669                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
2670                         goto out;
2671                 case -NFS4ERR_WRONGSEC:
2672                         err = -EPERM;
2673                         if (client != *clnt)
2674                                 goto out;
2675
2676                         client = nfs4_create_sec_client(client, dir, name);
2677                         if (IS_ERR(client))
2678                                 return PTR_ERR(client);
2679
2680                         exception.retry = 1;
2681                         break;
2682                 default:
2683                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
2684                 }
2685         } while (exception.retry);
2686
2687 out:
2688         if (err == 0)
2689                 *clnt = client;
2690         else if (client != *clnt)
2691                 rpc_shutdown_client(client);
2692
2693         return err;
2694 }
2695
2696 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
2697                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2698 {
2699         int status;
2700         struct rpc_clnt *client = NFS_CLIENT(dir);
2701
2702         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2703         if (client != NFS_CLIENT(dir)) {
2704                 rpc_shutdown_client(client);
2705                 nfs_fixup_secinfo_attributes(fattr);
2706         }
2707         return status;
2708 }
2709
2710 struct rpc_clnt *
2711 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
2712                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
2713 {
2714         int status;
2715         struct rpc_clnt *client = rpc_clone_client(NFS_CLIENT(dir));
2716
2717         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr);
2718         if (status < 0) {
2719                 rpc_shutdown_client(client);
2720                 return ERR_PTR(status);
2721         }
2722         return client;
2723 }
2724
2725 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2726 {
2727         struct nfs_server *server = NFS_SERVER(inode);
2728         struct nfs4_accessargs args = {
2729                 .fh = NFS_FH(inode),
2730                 .bitmask = server->cache_consistency_bitmask,
2731         };
2732         struct nfs4_accessres res = {
2733                 .server = server,
2734         };
2735         struct rpc_message msg = {
2736                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
2737                 .rpc_argp = &args,
2738                 .rpc_resp = &res,
2739                 .rpc_cred = entry->cred,
2740         };
2741         int mode = entry->mask;
2742         int status;
2743
2744         /*
2745          * Determine which access bits we want to ask for...
2746          */
2747         if (mode & MAY_READ)
2748                 args.access |= NFS4_ACCESS_READ;
2749         if (S_ISDIR(inode->i_mode)) {
2750                 if (mode & MAY_WRITE)
2751                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
2752                 if (mode & MAY_EXEC)
2753                         args.access |= NFS4_ACCESS_LOOKUP;
2754         } else {
2755                 if (mode & MAY_WRITE)
2756                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
2757                 if (mode & MAY_EXEC)
2758                         args.access |= NFS4_ACCESS_EXECUTE;
2759         }
2760
2761         res.fattr = nfs_alloc_fattr();
2762         if (res.fattr == NULL)
2763                 return -ENOMEM;
2764
2765         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2766         if (!status) {
2767                 nfs_access_set_mask(entry, res.access);
2768                 nfs_refresh_inode(inode, res.fattr);
2769         }
2770         nfs_free_fattr(res.fattr);
2771         return status;
2772 }
2773
2774 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
2775 {
2776         struct nfs4_exception exception = { };
2777         int err;
2778         do {
2779                 err = nfs4_handle_exception(NFS_SERVER(inode),
2780                                 _nfs4_proc_access(inode, entry),
2781                                 &exception);
2782         } while (exception.retry);
2783         return err;
2784 }
2785
2786 /*
2787  * TODO: For the time being, we don't try to get any attributes
2788  * along with any of the zero-copy operations READ, READDIR,
2789  * READLINK, WRITE.
2790  *
2791  * In the case of the first three, we want to put the GETATTR
2792  * after the read-type operation -- this is because it is hard
2793  * to predict the length of a GETATTR response in v4, and thus
2794  * align the READ data correctly.  This means that the GETATTR
2795  * may end up partially falling into the page cache, and we should
2796  * shift it into the 'tail' of the xdr_buf before processing.
2797  * To do this efficiently, we need to know the total length
2798  * of data received, which doesn't seem to be available outside
2799  * of the RPC layer.
2800  *
2801  * In the case of WRITE, we also want to put the GETATTR after
2802  * the operation -- in this case because we want to make sure
2803  * we get the post-operation mtime and size.
2804  *
2805  * Both of these changes to the XDR layer would in fact be quite
2806  * minor, but I decided to leave them for a subsequent patch.
2807  */
2808 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
2809                 unsigned int pgbase, unsigned int pglen)
2810 {
2811         struct nfs4_readlink args = {
2812                 .fh       = NFS_FH(inode),
2813                 .pgbase   = pgbase,
2814                 .pglen    = pglen,
2815                 .pages    = &page,
2816         };
2817         struct nfs4_readlink_res res;
2818         struct rpc_message msg = {
2819                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
2820                 .rpc_argp = &args,
2821                 .rpc_resp = &res,
2822         };
2823
2824         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
2825 }
2826
2827 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
2828                 unsigned int pgbase, unsigned int pglen)
2829 {
2830         struct nfs4_exception exception = { };
2831         int err;
2832         do {
2833                 err = nfs4_handle_exception(NFS_SERVER(inode),
2834                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
2835                                 &exception);
2836         } while (exception.retry);
2837         return err;
2838 }
2839
2840 /*
2841  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
2842  */
2843 static int
2844 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
2845                  int flags)
2846 {
2847         struct nfs_open_context *ctx;
2848         struct nfs4_state *state;
2849         int status = 0;
2850
2851         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
2852         if (IS_ERR(ctx))
2853                 return PTR_ERR(ctx);
2854
2855         sattr->ia_mode &= ~current_umask();
2856         state = nfs4_do_open(dir, dentry, ctx->mode,
2857                         flags, sattr, ctx->cred,
2858                         &ctx->mdsthreshold);
2859         d_drop(dentry);
2860         if (IS_ERR(state)) {
2861                 status = PTR_ERR(state);
2862                 goto out;
2863         }
2864         d_add(dentry, igrab(state->inode));
2865         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2866         ctx->state = state;
2867 out:
2868         put_nfs_open_context(ctx);
2869         return status;
2870 }
2871
2872 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2873 {
2874         struct nfs_server *server = NFS_SERVER(dir);
2875         struct nfs_removeargs args = {
2876                 .fh = NFS_FH(dir),
2877                 .name = *name,
2878         };
2879         struct nfs_removeres res = {
2880                 .server = server,
2881         };
2882         struct rpc_message msg = {
2883                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2884                 .rpc_argp = &args,
2885                 .rpc_resp = &res,
2886         };
2887         int status;
2888
2889         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
2890         if (status == 0)
2891                 update_changeattr(dir, &res.cinfo);
2892         return status;
2893 }
2894
2895 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2896 {
2897         struct nfs4_exception exception = { };
2898         int err;
2899         do {
2900                 err = nfs4_handle_exception(NFS_SERVER(dir),
2901                                 _nfs4_proc_remove(dir, name),
2902                                 &exception);
2903         } while (exception.retry);
2904         return err;
2905 }
2906
2907 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2908 {
2909         struct nfs_server *server = NFS_SERVER(dir);
2910         struct nfs_removeargs *args = msg->rpc_argp;
2911         struct nfs_removeres *res = msg->rpc_resp;
2912
2913         res->server = server;
2914         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2915         nfs41_init_sequence(&args->seq_args, &res->seq_res, 1);
2916 }
2917
2918 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
2919 {
2920         if (nfs4_setup_sequence(NFS_SERVER(data->dir),
2921                                 &data->args.seq_args,
2922                                 &data->res.seq_res,
2923                                 task))
2924                 return;
2925         rpc_call_start(task);
2926 }
2927
2928 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2929 {
2930         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2931
2932         if (!nfs4_sequence_done(task, &res->seq_res))
2933                 return 0;
2934         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2935                 return 0;
2936         update_changeattr(dir, &res->cinfo);
2937         return 1;
2938 }
2939
2940 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
2941 {
2942         struct nfs_server *server = NFS_SERVER(dir);
2943         struct nfs_renameargs *arg = msg->rpc_argp;
2944         struct nfs_renameres *res = msg->rpc_resp;
2945
2946         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
2947         res->server = server;
2948         nfs41_init_sequence(&arg->seq_args, &res->seq_res, 1);
2949 }
2950
2951 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
2952 {
2953         if (nfs4_setup_sequence(NFS_SERVER(data->old_dir),
2954                                 &data->args.seq_args,
2955                                 &data->res.seq_res,
2956                                 task))
2957                 return;
2958         rpc_call_start(task);
2959 }
2960
2961 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
2962                                  struct inode *new_dir)
2963 {
2964         struct nfs_renameres *res = task->tk_msg.rpc_resp;
2965
2966         if (!nfs4_sequence_done(task, &res->seq_res))
2967                 return 0;
2968         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2969                 return 0;
2970
2971         update_changeattr(old_dir, &res->old_cinfo);
2972         update_changeattr(new_dir, &res->new_cinfo);
2973         return 1;
2974 }
2975
2976 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2977                 struct inode *new_dir, struct qstr *new_name)
2978 {
2979         struct nfs_server *server = NFS_SERVER(old_dir);
2980         struct nfs_renameargs arg = {
2981                 .old_dir = NFS_FH(old_dir),
2982                 .new_dir = NFS_FH(new_dir),
2983                 .old_name = old_name,
2984                 .new_name = new_name,
2985         };
2986         struct nfs_renameres res = {
2987                 .server = server,
2988         };
2989         struct rpc_message msg = {
2990                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2991                 .rpc_argp = &arg,
2992                 .rpc_resp = &res,
2993         };
2994         int status = -ENOMEM;
2995
2996         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2997         if (!status) {
2998                 update_changeattr(old_dir, &res.old_cinfo);
2999                 update_changeattr(new_dir, &res.new_cinfo);
3000         }
3001         return status;
3002 }
3003
3004 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
3005                 struct inode *new_dir, struct qstr *new_name)
3006 {
3007         struct nfs4_exception exception = { };
3008         int err;
3009         do {
3010                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
3011                                 _nfs4_proc_rename(old_dir, old_name,
3012                                         new_dir, new_name),
3013                                 &exception);
3014         } while (exception.retry);
3015         return err;
3016 }
3017
3018 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3019 {
3020         struct nfs_server *server = NFS_SERVER(inode);
3021         struct nfs4_link_arg arg = {
3022                 .fh     = NFS_FH(inode),
3023                 .dir_fh = NFS_FH(dir),
3024                 .name   = name,
3025                 .bitmask = server->attr_bitmask,
3026         };
3027         struct nfs4_link_res res = {
3028                 .server = server,
3029         };
3030         struct rpc_message msg = {
3031                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3032                 .rpc_argp = &arg,
3033                 .rpc_resp = &res,
3034         };
3035         int status = -ENOMEM;
3036
3037         res.fattr = nfs_alloc_fattr();
3038         if (res.fattr == NULL)
3039                 goto out;
3040
3041         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3042         if (!status) {
3043                 update_changeattr(dir, &res.cinfo);
3044                 nfs_post_op_update_inode(inode, res.fattr);
3045         }
3046 out:
3047         nfs_free_fattr(res.fattr);
3048         return status;
3049 }
3050
3051 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3052 {
3053         struct nfs4_exception exception = { };
3054         int err;
3055         do {
3056                 err = nfs4_handle_exception(NFS_SERVER(inode),
3057                                 _nfs4_proc_link(inode, dir, name),
3058                                 &exception);
3059         } while (exception.retry);
3060         return err;
3061 }
3062
3063 struct nfs4_createdata {
3064         struct rpc_message msg;
3065         struct nfs4_create_arg arg;
3066         struct nfs4_create_res res;
3067         struct nfs_fh fh;
3068         struct nfs_fattr fattr;
3069 };
3070
3071 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3072                 struct qstr *name, struct iattr *sattr, u32 ftype)
3073 {
3074         struct nfs4_createdata *data;
3075
3076         data = kzalloc(sizeof(*data), GFP_KERNEL);
3077         if (data != NULL) {
3078                 struct nfs_server *server = NFS_SERVER(dir);
3079
3080                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3081                 data->msg.rpc_argp = &data->arg;
3082                 data->msg.rpc_resp = &data->res;
3083                 data->arg.dir_fh = NFS_FH(dir);
3084                 data->arg.server = server;
3085                 data->arg.name = name;
3086                 data->arg.attrs = sattr;
3087                 data->arg.ftype = ftype;
3088                 data->arg.bitmask = server->attr_bitmask;
3089                 data->res.server = server;
3090                 data->res.fh = &data->fh;
3091                 data->res.fattr = &data->fattr;
3092                 nfs_fattr_init(data->res.fattr);
3093         }
3094         return data;
3095 }
3096
3097 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3098 {
3099         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3100                                     &data->arg.seq_args, &data->res.seq_res, 1);
3101         if (status == 0) {
3102                 update_changeattr(dir, &data->res.dir_cinfo);
3103                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
3104         }
3105         return status;
3106 }
3107
3108 static void nfs4_free_createdata(struct nfs4_createdata *data)
3109 {
3110         kfree(data);
3111 }
3112
3113 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3114                 struct page *page, unsigned int len, struct iattr *sattr)
3115 {
3116         struct nfs4_createdata *data;
3117         int status = -ENAMETOOLONG;
3118
3119         if (len > NFS4_MAXPATHLEN)
3120                 goto out;
3121
3122         status = -ENOMEM;
3123         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3124         if (data == NULL)
3125                 goto out;
3126
3127         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3128         data->arg.u.symlink.pages = &page;
3129         data->arg.u.symlink.len = len;
3130
3131         status = nfs4_do_create(dir, dentry, data);
3132
3133         nfs4_free_createdata(data);
3134 out:
3135         return status;
3136 }
3137
3138 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3139                 struct page *page, unsigned int len, struct iattr *sattr)
3140 {
3141         struct nfs4_exception exception = { };
3142         int err;
3143         do {
3144                 err = nfs4_handle_exception(NFS_SERVER(dir),
3145                                 _nfs4_proc_symlink(dir, dentry, page,
3146                                                         len, sattr),
3147                                 &exception);
3148         } while (exception.retry);
3149         return err;
3150 }
3151
3152 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3153                 struct iattr *sattr)
3154 {
3155         struct nfs4_createdata *data;
3156         int status = -ENOMEM;
3157
3158         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3159         if (data == NULL)
3160                 goto out;
3161
3162         status = nfs4_do_create(dir, dentry, data);
3163
3164         nfs4_free_createdata(data);
3165 out:
3166         return status;
3167 }
3168
3169 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3170                 struct iattr *sattr)
3171 {
3172         struct nfs4_exception exception = { };
3173         int err;
3174
3175         sattr->ia_mode &= ~current_umask();
3176         do {
3177                 err = nfs4_handle_exception(NFS_SERVER(dir),
3178                                 _nfs4_proc_mkdir(dir, dentry, sattr),
3179                                 &exception);
3180         } while (exception.retry);
3181         return err;
3182 }
3183
3184 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3185                 u64 cookie, struct page **pages, unsigned int count, int plus)
3186 {
3187         struct inode            *dir = dentry->d_inode;
3188         struct nfs4_readdir_arg args = {
3189                 .fh = NFS_FH(dir),
3190                 .pages = pages,
3191                 .pgbase = 0,
3192                 .count = count,
3193                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
3194                 .plus = plus,
3195         };
3196         struct nfs4_readdir_res res;
3197         struct rpc_message msg = {
3198                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3199                 .rpc_argp = &args,
3200                 .rpc_resp = &res,
3201                 .rpc_cred = cred,
3202         };
3203         int                     status;
3204
3205         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
3206                         dentry->d_parent->d_name.name,
3207                         dentry->d_name.name,
3208                         (unsigned long long)cookie);
3209         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3210         res.pgbase = args.pgbase;
3211         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3212         if (status >= 0) {
3213                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3214                 status += args.pgbase;
3215         }
3216
3217         nfs_invalidate_atime(dir);
3218
3219         dprintk("%s: returns %d\n", __func__, status);
3220         return status;
3221 }
3222
3223 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3224                 u64 cookie, struct page **pages, unsigned int count, int plus)
3225 {
3226         struct nfs4_exception exception = { };
3227         int err;
3228         do {
3229                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
3230                                 _nfs4_proc_readdir(dentry, cred, cookie,
3231                                         pages, count, plus),
3232                                 &exception);
3233         } while (exception.retry);
3234         return err;
3235 }
3236
3237 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3238                 struct iattr *sattr, dev_t rdev)
3239 {
3240         struct nfs4_createdata *data;
3241         int mode = sattr->ia_mode;
3242         int status = -ENOMEM;
3243
3244         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3245         if (data == NULL)
3246                 goto out;
3247
3248         if (S_ISFIFO(mode))
3249                 data->arg.ftype = NF4FIFO;
3250         else if (S_ISBLK(mode)) {
3251                 data->arg.ftype = NF4BLK;
3252                 data->arg.u.device.specdata1 = MAJOR(rdev);
3253                 data->arg.u.device.specdata2 = MINOR(rdev);
3254         }
3255         else if (S_ISCHR(mode)) {
3256                 data->arg.ftype = NF4CHR;
3257                 data->arg.u.device.specdata1 = MAJOR(rdev);
3258                 data->arg.u.device.specdata2 = MINOR(rdev);
3259         } else if (!S_ISSOCK(mode)) {
3260                 status = -EINVAL;
3261                 goto out_free;
3262         }
3263
3264         status = nfs4_do_create(dir, dentry, data);
3265 out_free:
3266         nfs4_free_createdata(data);
3267 out:
3268         return status;
3269 }
3270
3271 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3272                 struct iattr *sattr, dev_t rdev)
3273 {
3274         struct nfs4_exception exception = { };
3275         int err;
3276
3277         sattr->ia_mode &= ~current_umask();
3278         do {
3279                 err = nfs4_handle_exception(NFS_SERVER(dir),
3280                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
3281                                 &exception);
3282         } while (exception.retry);
3283         return err;
3284 }
3285
3286 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3287                  struct nfs_fsstat *fsstat)
3288 {
3289         struct nfs4_statfs_arg args = {
3290                 .fh = fhandle,
3291                 .bitmask = server->attr_bitmask,
3292         };
3293         struct nfs4_statfs_res res = {
3294                 .fsstat = fsstat,
3295         };
3296         struct rpc_message msg = {
3297                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3298                 .rpc_argp = &args,
3299                 .rpc_resp = &res,
3300         };
3301
3302         nfs_fattr_init(fsstat->fattr);
3303         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3304 }
3305
3306 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
3307 {
3308         struct nfs4_exception exception = { };
3309         int err;
3310         do {
3311                 err = nfs4_handle_exception(server,
3312                                 _nfs4_proc_statfs(server, fhandle, fsstat),
3313                                 &exception);
3314         } while (exception.retry);
3315         return err;
3316 }
3317
3318 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
3319                 struct nfs_fsinfo *fsinfo)
3320 {
3321         struct nfs4_fsinfo_arg args = {
3322                 .fh = fhandle,
3323                 .bitmask = server->attr_bitmask,
3324         };
3325         struct nfs4_fsinfo_res res = {
3326                 .fsinfo = fsinfo,
3327         };
3328         struct rpc_message msg = {
3329                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
3330                 .rpc_argp = &args,
3331                 .rpc_resp = &res,
3332         };
3333
3334         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3335 }
3336
3337 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3338 {
3339         struct nfs4_exception exception = { };
3340         int err;
3341
3342         do {
3343                 err = nfs4_handle_exception(server,
3344                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
3345                                 &exception);
3346         } while (exception.retry);
3347         return err;
3348 }
3349
3350 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
3351 {
3352         int error;
3353
3354         nfs_fattr_init(fsinfo->fattr);
3355         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
3356         if (error == 0) {
3357                 /* block layout checks this! */
3358                 server->pnfs_blksize = fsinfo->blksize;
3359                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
3360         }
3361
3362         return error;
3363 }
3364
3365 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3366                 struct nfs_pathconf *pathconf)
3367 {
3368         struct nfs4_pathconf_arg args = {
3369                 .fh = fhandle,
3370                 .bitmask = server->attr_bitmask,
3371         };
3372         struct nfs4_pathconf_res res = {
3373                 .pathconf = pathconf,
3374         };
3375         struct rpc_message msg = {
3376                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
3377                 .rpc_argp = &args,
3378                 .rpc_resp = &res,
3379         };
3380
3381         /* None of the pathconf attributes are mandatory to implement */
3382         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
3383                 memset(pathconf, 0, sizeof(*pathconf));
3384                 return 0;
3385         }
3386
3387         nfs_fattr_init(pathconf->fattr);
3388         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3389 }
3390
3391 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
3392                 struct nfs_pathconf *pathconf)
3393 {
3394         struct nfs4_exception exception = { };
3395         int err;
3396
3397         do {
3398                 err = nfs4_handle_exception(server,
3399                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
3400                                 &exception);
3401         } while (exception.retry);
3402         return err;
3403 }
3404
3405 void __nfs4_read_done_cb(struct nfs_read_data *data)
3406 {
3407         nfs_invalidate_atime(data->header->inode);
3408 }
3409
3410 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_read_data *data)
3411 {
3412         struct nfs_server *server = NFS_SERVER(data->header->inode);
3413
3414         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
3415                 rpc_restart_call_prepare(task);
3416                 return -EAGAIN;
3417         }
3418
3419         __nfs4_read_done_cb(data);
3420         if (task->tk_status > 0)
3421                 renew_lease(server, data->timestamp);
3422         return 0;
3423 }
3424
3425 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
3426 {
3427
3428         dprintk("--> %s\n", __func__);
3429
3430         if (!nfs4_sequence_done(task, &data->res.seq_res))
3431                 return -EAGAIN;
3432
3433         return data->read_done_cb ? data->read_done_cb(task, data) :
3434                                     nfs4_read_done_cb(task, data);
3435 }
3436
3437 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
3438 {
3439         data->timestamp   = jiffies;
3440         data->read_done_cb = nfs4_read_done_cb;
3441         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
3442         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
3443 }
3444
3445 static void nfs4_proc_read_rpc_prepare(struct rpc_task *task, struct nfs_read_data *data)
3446 {
3447         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3448                                 &data->args.seq_args,
3449                                 &data->res.seq_res,
3450                                 task))
3451                 return;
3452         rpc_call_start(task);
3453 }
3454
3455 static int nfs4_write_done_cb(struct rpc_task *task, struct nfs_write_data *data)
3456 {
3457         struct inode *inode = data->header->inode;
3458
3459         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
3460                 rpc_restart_call_prepare(task);
3461                 return -EAGAIN;
3462         }
3463         if (task->tk_status >= 0) {
3464                 renew_lease(NFS_SERVER(inode), data->timestamp);
3465                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
3466         }
3467         return 0;
3468 }
3469
3470 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
3471 {
3472         if (!nfs4_sequence_done(task, &data->res.seq_res))
3473                 return -EAGAIN;
3474         return data->write_done_cb ? data->write_done_cb(task, data) :
3475                 nfs4_write_done_cb(task, data);
3476 }
3477
3478 static
3479 bool nfs4_write_need_cache_consistency_data(const struct nfs_write_data *data)
3480 {
3481         const struct nfs_pgio_header *hdr = data->header;
3482
3483         /* Don't request attributes for pNFS or O_DIRECT writes */
3484         if (data->ds_clp != NULL || hdr->dreq != NULL)
3485                 return false;
3486         /* Otherwise, request attributes if and only if we don't hold
3487          * a delegation
3488          */
3489         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
3490 }
3491
3492 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
3493 {
3494         struct nfs_server *server = NFS_SERVER(data->header->inode);
3495
3496         if (!nfs4_write_need_cache_consistency_data(data)) {
3497                 data->args.bitmask = NULL;
3498                 data->res.fattr = NULL;
3499         } else
3500                 data->args.bitmask = server->cache_consistency_bitmask;
3501
3502         if (!data->write_done_cb)
3503                 data->write_done_cb = nfs4_write_done_cb;
3504         data->res.server = server;
3505         data->timestamp   = jiffies;
3506
3507         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
3508         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3509 }
3510
3511 static void nfs4_proc_write_rpc_prepare(struct rpc_task *task, struct nfs_write_data *data)
3512 {
3513         if (nfs4_setup_sequence(NFS_SERVER(data->header->inode),
3514                                 &data->args.seq_args,
3515                                 &data->res.seq_res,
3516                                 task))
3517                 return;
3518         rpc_call_start(task);
3519 }
3520
3521 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
3522 {
3523         if (nfs4_setup_sequence(NFS_SERVER(data->inode),
3524                                 &data->args.seq_args,
3525                                 &data->res.seq_res,
3526                                 task))
3527                 return;
3528         rpc_call_start(task);
3529 }
3530
3531 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
3532 {
3533         struct inode *inode = data->inode;
3534
3535         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
3536                 rpc_restart_call_prepare(task);
3537                 return -EAGAIN;
3538         }
3539         return 0;
3540 }
3541
3542 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
3543 {
3544         if (!nfs4_sequence_done(task, &data->res.seq_res))
3545                 return -EAGAIN;
3546         return data->commit_done_cb(task, data);
3547 }
3548
3549 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
3550 {
3551         struct nfs_server *server = NFS_SERVER(data->inode);
3552
3553         if (data->commit_done_cb == NULL)
3554                 data->commit_done_cb = nfs4_commit_done_cb;
3555         data->res.server = server;
3556         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
3557         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
3558 }
3559
3560 struct nfs4_renewdata {
3561         struct nfs_client       *client;
3562         unsigned long           timestamp;
3563 };
3564
3565 /*
3566  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
3567  * standalone procedure for queueing an asynchronous RENEW.
3568  */
3569 static void nfs4_renew_release(void *calldata)
3570 {
3571         struct nfs4_renewdata *data = calldata;
3572         struct nfs_client *clp = data->client;
3573
3574         if (atomic_read(&clp->cl_count) > 1)
3575                 nfs4_schedule_state_renewal(clp);
3576         nfs_put_client(clp);
3577         kfree(data);
3578 }
3579
3580 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
3581 {
3582         struct nfs4_renewdata *data = calldata;
3583         struct nfs_client *clp = data->client;
3584         unsigned long timestamp = data->timestamp;
3585
3586         if (task->tk_status < 0) {
3587                 /* Unless we're shutting down, schedule state recovery! */
3588                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
3589                         return;
3590                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
3591                         nfs4_schedule_lease_recovery(clp);
3592                         return;
3593                 }
3594                 nfs4_schedule_path_down_recovery(clp);
3595         }
3596         do_renew_lease(clp, timestamp);
3597 }
3598
3599 static const struct rpc_call_ops nfs4_renew_ops = {
3600         .rpc_call_done = nfs4_renew_done,
3601         .rpc_release = nfs4_renew_release,
3602 };
3603
3604 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
3605 {
3606         struct rpc_message msg = {
3607                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3608                 .rpc_argp       = clp,
3609                 .rpc_cred       = cred,
3610         };
3611         struct nfs4_renewdata *data;
3612
3613         if (renew_flags == 0)
3614                 return 0;
3615         if (!atomic_inc_not_zero(&clp->cl_count))
3616                 return -EIO;
3617         data = kmalloc(sizeof(*data), GFP_NOFS);
3618         if (data == NULL)
3619                 return -ENOMEM;
3620         data->client = clp;
3621         data->timestamp = jiffies;
3622         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
3623                         &nfs4_renew_ops, data);
3624 }
3625
3626 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
3627 {
3628         struct rpc_message msg = {
3629                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
3630                 .rpc_argp       = clp,
3631                 .rpc_cred       = cred,
3632         };
3633         unsigned long now = jiffies;
3634         int status;
3635
3636         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
3637         if (status < 0)
3638                 return status;
3639         do_renew_lease(clp, now);
3640         return 0;
3641 }
3642
3643 static inline int nfs4_server_supports_acls(struct nfs_server *server)
3644 {
3645         return (server->caps & NFS_CAP_ACLS)
3646                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3647                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
3648 }
3649
3650 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
3651  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
3652  * the stack.
3653  */
3654 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
3655
3656 static int buf_to_pages_noslab(const void *buf, size_t buflen,
3657                 struct page **pages, unsigned int *pgbase)
3658 {
3659         struct page *newpage, **spages;
3660         int rc = 0;
3661         size_t len;
3662         spages = pages;
3663
3664         do {
3665                 len = min_t(size_t, PAGE_SIZE, buflen);
3666                 newpage = alloc_page(GFP_KERNEL);
3667
3668                 if (newpage == NULL)
3669                         goto unwind;
3670                 memcpy(page_address(newpage), buf, len);
3671                 buf += len;
3672                 buflen -= len;
3673                 *pages++ = newpage;
3674                 rc++;
3675         } while (buflen != 0);
3676
3677         return rc;
3678
3679 unwind:
3680         for(; rc > 0; rc--)
3681                 __free_page(spages[rc-1]);
3682         return -ENOMEM;
3683 }
3684
3685 struct nfs4_cached_acl {
3686         int cached;
3687         size_t len;
3688         char data[0];
3689 };
3690
3691 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
3692 {
3693         struct nfs_inode *nfsi = NFS_I(inode);
3694
3695         spin_lock(&inode->i_lock);
3696         kfree(nfsi->nfs4_acl);
3697         nfsi->nfs4_acl = acl;
3698         spin_unlock(&inode->i_lock);
3699 }
3700
3701 static void nfs4_zap_acl_attr(struct inode *inode)
3702 {
3703         nfs4_set_cached_acl(inode, NULL);
3704 }
3705
3706 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
3707 {
3708         struct nfs_inode *nfsi = NFS_I(inode);
3709         struct nfs4_cached_acl *acl;
3710         int ret = -ENOENT;
3711
3712         spin_lock(&inode->i_lock);
3713         acl = nfsi->nfs4_acl;
3714         if (acl == NULL)
3715                 goto out;
3716         if (buf == NULL) /* user is just asking for length */
3717                 goto out_len;
3718         if (acl->cached == 0)
3719                 goto out;
3720         ret = -ERANGE; /* see getxattr(2) man page */
3721         if (acl->len > buflen)
3722                 goto out;
3723         memcpy(buf, acl->data, acl->len);
3724 out_len:
3725         ret = acl->len;
3726 out:
3727         spin_unlock(&inode->i_lock);
3728         return ret;
3729 }
3730
3731 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
3732 {
3733         struct nfs4_cached_acl *acl;
3734         size_t buflen = sizeof(*acl) + acl_len;
3735
3736         if (buflen <= PAGE_SIZE) {
3737                 acl = kmalloc(buflen, GFP_KERNEL);
3738                 if (acl == NULL)
3739                         goto out;
3740                 acl->cached = 1;
3741                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
3742         } else {
3743                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
3744                 if (acl == NULL)
3745                         goto out;
3746                 acl->cached = 0;
3747         }
3748         acl->len = acl_len;
3749 out:
3750         nfs4_set_cached_acl(inode, acl);
3751 }
3752
3753 /*
3754  * The getxattr API returns the required buffer length when called with a
3755  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
3756  * the required buf.  On a NULL buf, we send a page of data to the server
3757  * guessing that the ACL request can be serviced by a page. If so, we cache
3758  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
3759  * the cache. If not so, we throw away the page, and cache the required
3760  * length. The next getxattr call will then produce another round trip to
3761  * the server, this time with the input buf of the required size.
3762  */
3763 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3764 {
3765         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
3766         struct nfs_getaclargs args = {
3767                 .fh = NFS_FH(inode),
3768                 .acl_pages = pages,
3769                 .acl_len = buflen,
3770         };
3771         struct nfs_getaclres res = {
3772                 .acl_len = buflen,
3773         };
3774         struct rpc_message msg = {
3775                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
3776                 .rpc_argp = &args,
3777                 .rpc_resp = &res,
3778         };
3779         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3780         int ret = -ENOMEM, i;
3781
3782         /* As long as we're doing a round trip to the server anyway,
3783          * let's be prepared for a page of acl data. */
3784         if (npages == 0)
3785                 npages = 1;
3786         if (npages > ARRAY_SIZE(pages))
3787                 return -ERANGE;
3788
3789         for (i = 0; i < npages; i++) {
3790                 pages[i] = alloc_page(GFP_KERNEL);
3791                 if (!pages[i])
3792                         goto out_free;
3793         }
3794
3795         /* for decoding across pages */
3796         res.acl_scratch = alloc_page(GFP_KERNEL);
3797         if (!res.acl_scratch)
3798                 goto out_free;
3799
3800         args.acl_len = npages * PAGE_SIZE;
3801         args.acl_pgbase = 0;
3802
3803         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
3804                 __func__, buf, buflen, npages, args.acl_len);
3805         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
3806                              &msg, &args.seq_args, &res.seq_res, 0);
3807         if (ret)
3808                 goto out_free;
3809
3810         /* Handle the case where the passed-in buffer is too short */
3811         if (res.acl_flags & NFS4_ACL_TRUNC) {
3812                 /* Did the user only issue a request for the acl length? */
3813                 if (buf == NULL)
3814                         goto out_ok;
3815                 ret = -ERANGE;
3816                 goto out_free;
3817         }
3818         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
3819         if (buf)
3820                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
3821 out_ok:
3822         ret = res.acl_len;
3823 out_free:
3824         for (i = 0; i < npages; i++)
3825                 if (pages[i])
3826                         __free_page(pages[i]);
3827         if (res.acl_scratch)
3828                 __free_page(res.acl_scratch);
3829         return ret;
3830 }
3831
3832 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
3833 {
3834         struct nfs4_exception exception = { };
3835         ssize_t ret;
3836         do {
3837                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
3838                 if (ret >= 0)
3839                         break;
3840                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
3841         } while (exception.retry);
3842         return ret;
3843 }
3844
3845 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
3846 {
3847         struct nfs_server *server = NFS_SERVER(inode);
3848         int ret;
3849
3850         if (!nfs4_server_supports_acls(server))
3851                 return -EOPNOTSUPP;
3852         ret = nfs_revalidate_inode(server, inode);
3853         if (ret < 0)
3854                 return ret;
3855         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
3856                 nfs_zap_acl_cache(inode);
3857         ret = nfs4_read_cached_acl(inode, buf, buflen);
3858         if (ret != -ENOENT)
3859                 /* -ENOENT is returned if there is no ACL or if there is an ACL
3860                  * but no cached acl data, just the acl length */
3861                 return ret;
3862         return nfs4_get_acl_uncached(inode, buf, buflen);
3863 }
3864
3865 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3866 {
3867         struct nfs_server *server = NFS_SERVER(inode);
3868         struct page *pages[NFS4ACL_MAXPAGES];
3869         struct nfs_setaclargs arg = {
3870                 .fh             = NFS_FH(inode),
3871                 .acl_pages      = pages,
3872                 .acl_len        = buflen,
3873         };
3874         struct nfs_setaclres res;
3875         struct rpc_message msg = {
3876                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
3877                 .rpc_argp       = &arg,
3878                 .rpc_resp       = &res,
3879         };
3880         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
3881         int ret, i;
3882
3883         if (!nfs4_server_supports_acls(server))
3884                 return -EOPNOTSUPP;
3885         if (npages > ARRAY_SIZE(pages))
3886                 return -ERANGE;
3887         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
3888         if (i < 0)
3889                 return i;
3890         nfs4_inode_return_delegation(inode);
3891         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3892
3893         /*
3894          * Free each page after tx, so the only ref left is
3895          * held by the network stack
3896          */
3897         for (; i > 0; i--)
3898                 put_page(pages[i-1]);
3899
3900         /*
3901          * Acl update can result in inode attribute update.
3902          * so mark the attribute cache invalid.
3903          */
3904         spin_lock(&inode->i_lock);
3905         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
3906         spin_unlock(&inode->i_lock);
3907         nfs_access_zap_cache(inode);
3908         nfs_zap_acl_cache(inode);
3909         return ret;
3910 }
3911
3912 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
3913 {
3914         struct nfs4_exception exception = { };
3915         int err;
3916         do {
3917                 err = nfs4_handle_exception(NFS_SERVER(inode),
3918                                 __nfs4_proc_set_acl(inode, buf, buflen),
3919                                 &exception);
3920         } while (exception.retry);
3921         return err;
3922 }
3923
3924 static int
3925 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
3926 {
3927         struct nfs_client *clp = server->nfs_client;
3928
3929         if (task->tk_status >= 0)
3930                 return 0;
3931         switch(task->tk_status) {
3932                 case -NFS4ERR_DELEG_REVOKED:
3933                 case -NFS4ERR_ADMIN_REVOKED:
3934                 case -NFS4ERR_BAD_STATEID:
3935                         if (state == NULL)
3936                                 break;
3937                         nfs_remove_bad_delegation(state->inode);
3938                 case -NFS4ERR_OPENMODE:
3939                         if (state == NULL)
3940                                 break;
3941                         nfs4_schedule_stateid_recovery(server, state);
3942                         goto wait_on_recovery;
3943                 case -NFS4ERR_EXPIRED:
3944                         if (state != NULL)
3945                                 nfs4_schedule_stateid_recovery(server, state);
3946                 case -NFS4ERR_STALE_STATEID:
3947                 case -NFS4ERR_STALE_CLIENTID:
3948                         nfs4_schedule_lease_recovery(clp);
3949                         goto wait_on_recovery;
3950 #if defined(CONFIG_NFS_V4_1)
3951                 case -NFS4ERR_BADSESSION:
3952                 case -NFS4ERR_BADSLOT:
3953                 case -NFS4ERR_BAD_HIGH_SLOT:
3954                 case -NFS4ERR_DEADSESSION:
3955                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
3956                 case -NFS4ERR_SEQ_FALSE_RETRY:
3957                 case -NFS4ERR_SEQ_MISORDERED:
3958                         dprintk("%s ERROR %d, Reset session\n", __func__,
3959                                 task->tk_status);
3960                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
3961                         task->tk_status = 0;
3962                         return -EAGAIN;
3963 #endif /* CONFIG_NFS_V4_1 */
3964                 case -NFS4ERR_DELAY:
3965                         nfs_inc_server_stats(server, NFSIOS_DELAY);
3966                 case -NFS4ERR_GRACE:
3967                 case -EKEYEXPIRED:
3968                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
3969                         task->tk_status = 0;
3970                         return -EAGAIN;
3971                 case -NFS4ERR_RETRY_UNCACHED_REP:
3972                 case -NFS4ERR_OLD_STATEID:
3973                         task->tk_status = 0;
3974                         return -EAGAIN;
3975         }
3976         task->tk_status = nfs4_map_errors(task->tk_status);
3977         return 0;
3978 wait_on_recovery:
3979         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
3980         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
3981                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
3982         task->tk_status = 0;
3983         return -EAGAIN;
3984 }
3985
3986 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
3987                                     nfs4_verifier *bootverf)
3988 {
3989         __be32 verf[2];
3990
3991         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
3992                 /* An impossible timestamp guarantees this value
3993                  * will never match a generated boot time. */
3994                 verf[0] = 0;
3995                 verf[1] = (__be32)(NSEC_PER_SEC + 1);
3996         } else {
3997                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
3998                 verf[0] = (__be32)nn->boot_time.tv_sec;
3999                 verf[1] = (__be32)nn->boot_time.tv_nsec;
4000         }
4001         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4002 }
4003
4004 static unsigned int
4005 nfs4_init_nonuniform_client_string(const struct nfs_client *clp,
4006                                    char *buf, size_t len)
4007 {
4008         unsigned int result;
4009
4010         rcu_read_lock();
4011         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4012                                 clp->cl_ipaddr,
4013                                 rpc_peeraddr2str(clp->cl_rpcclient,
4014                                                         RPC_DISPLAY_ADDR),
4015                                 rpc_peeraddr2str(clp->cl_rpcclient,
4016                                                         RPC_DISPLAY_PROTO));
4017         rcu_read_unlock();
4018         return result;
4019 }
4020
4021 static unsigned int
4022 nfs4_init_uniform_client_string(const struct nfs_client *clp,
4023                                 char *buf, size_t len)
4024 {
4025         char *nodename = clp->cl_rpcclient->cl_nodename;
4026
4027         if (nfs4_client_id_uniquifier[0] != '\0')
4028                 nodename = nfs4_client_id_uniquifier;
4029         return scnprintf(buf, len, "Linux NFSv%u.%u %s",
4030                                 clp->rpc_ops->version, clp->cl_minorversion,
4031                                 nodename);
4032 }
4033
4034 /**
4035  * nfs4_proc_setclientid - Negotiate client ID
4036  * @clp: state data structure
4037  * @program: RPC program for NFSv4 callback service
4038  * @port: IP port number for NFS4 callback service
4039  * @cred: RPC credential to use for this call
4040  * @res: where to place the result
4041  *
4042  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4043  */
4044 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
4045                 unsigned short port, struct rpc_cred *cred,
4046                 struct nfs4_setclientid_res *res)
4047 {
4048         nfs4_verifier sc_verifier;
4049         struct nfs4_setclientid setclientid = {
4050                 .sc_verifier = &sc_verifier,
4051                 .sc_prog = program,
4052                 .sc_cb_ident = clp->cl_cb_ident,
4053         };
4054         struct rpc_message msg = {
4055                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
4056                 .rpc_argp = &setclientid,
4057                 .rpc_resp = res,
4058                 .rpc_cred = cred,
4059         };
4060         int status;
4061
4062         /* nfs_client_id4 */
4063         nfs4_init_boot_verifier(clp, &sc_verifier);
4064         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
4065                 setclientid.sc_name_len =
4066                                 nfs4_init_uniform_client_string(clp,
4067                                                 setclientid.sc_name,
4068                                                 sizeof(setclientid.sc_name));
4069         else
4070                 setclientid.sc_name_len =
4071                                 nfs4_init_nonuniform_client_string(clp,
4072                                                 setclientid.sc_name,
4073                                                 sizeof(setclientid.sc_name));
4074         /* cb_client4 */
4075         rcu_read_lock();
4076         setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
4077                                 sizeof(setclientid.sc_netid),
4078                                 rpc_peeraddr2str(clp->cl_rpcclient,
4079                                                         RPC_DISPLAY_NETID));
4080         rcu_read_unlock();
4081         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
4082                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
4083                                 clp->cl_ipaddr, port >> 8, port & 255);
4084
4085         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
4086                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4087                 setclientid.sc_name_len, setclientid.sc_name);
4088         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4089         dprintk("NFS reply setclientid: %d\n", status);
4090         return status;
4091 }
4092
4093 /**
4094  * nfs4_proc_setclientid_confirm - Confirm client ID
4095  * @clp: state data structure
4096  * @res: result of a previous SETCLIENTID
4097  * @cred: RPC credential to use for this call
4098  *
4099  * Returns zero, a negative errno, or a negative NFS4ERR status code.
4100  */
4101 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
4102                 struct nfs4_setclientid_res *arg,
4103                 struct rpc_cred *cred)
4104 {
4105         struct nfs_fsinfo fsinfo;
4106         struct rpc_message msg = {
4107                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
4108                 .rpc_argp = arg,
4109                 .rpc_resp = &fsinfo,
4110                 .rpc_cred = cred,
4111         };
4112         unsigned long now;
4113         int status;
4114
4115         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
4116                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
4117                 clp->cl_clientid);
4118         now = jiffies;
4119         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4120         if (status == 0) {
4121                 spin_lock(&clp->cl_lock);
4122                 clp->cl_lease_time = fsinfo.lease_time * HZ;
4123                 clp->cl_last_renewal = now;
4124                 spin_unlock(&clp->cl_lock);
4125         }
4126         dprintk("NFS reply setclientid_confirm: %d\n", status);
4127         return status;
4128 }
4129
4130 struct nfs4_delegreturndata {
4131         struct nfs4_delegreturnargs args;
4132         struct nfs4_delegreturnres res;
4133         struct nfs_fh fh;
4134         nfs4_stateid stateid;
4135         unsigned long timestamp;
4136         struct nfs_fattr fattr;
4137         int rpc_status;
4138 };
4139
4140 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
4141 {
4142         struct nfs4_delegreturndata *data = calldata;
4143
4144         if (!nfs4_sequence_done(task, &data->res.seq_res))
4145                 return;
4146
4147         switch (task->tk_status) {
4148         case -NFS4ERR_STALE_STATEID:
4149         case -NFS4ERR_EXPIRED:
4150         case 0:
4151                 renew_lease(data->res.server, data->timestamp);
4152                 break;
4153         default:
4154                 if (nfs4_async_handle_error(task, data->res.server, NULL) ==
4155                                 -EAGAIN) {
4156                         rpc_restart_call_prepare(task);
4157                         return;
4158                 }
4159         }
4160         data->rpc_status = task->tk_status;
4161 }
4162
4163 static void nfs4_delegreturn_release(void *calldata)
4164 {
4165         kfree(calldata);
4166 }
4167
4168 #if defined(CONFIG_NFS_V4_1)
4169 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
4170 {
4171         struct nfs4_delegreturndata *d_data;
4172
4173         d_data = (struct nfs4_delegreturndata *)data;
4174
4175         if (nfs4_setup_sequence(d_data->res.server,
4176                                 &d_data->args.seq_args,
4177                                 &d_data->res.seq_res, task))
4178                 return;
4179         rpc_call_start(task);
4180 }
4181 #endif /* CONFIG_NFS_V4_1 */
4182
4183 static const struct rpc_call_ops nfs4_delegreturn_ops = {
4184 #if defined(CONFIG_NFS_V4_1)
4185         .rpc_call_prepare = nfs4_delegreturn_prepare,
4186 #endif /* CONFIG_NFS_V4_1 */
4187         .rpc_call_done = nfs4_delegreturn_done,
4188         .rpc_release = nfs4_delegreturn_release,
4189 };
4190
4191 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4192 {
4193         struct nfs4_delegreturndata *data;
4194         struct nfs_server *server = NFS_SERVER(inode);
4195         struct rpc_task *task;
4196         struct rpc_message msg = {
4197                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
4198                 .rpc_cred = cred,
4199         };
4200         struct rpc_task_setup task_setup_data = {
4201                 .rpc_client = server->client,
4202                 .rpc_message = &msg,
4203                 .callback_ops = &nfs4_delegreturn_ops,
4204                 .flags = RPC_TASK_ASYNC,
4205         };
4206         int status = 0;
4207
4208         data = kzalloc(sizeof(*data), GFP_NOFS);
4209         if (data == NULL)
4210                 return -ENOMEM;
4211         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4212         data->args.fhandle = &data->fh;
4213         data->args.stateid = &data->stateid;
4214         data->args.bitmask = server->cache_consistency_bitmask;
4215         nfs_copy_fh(&data->fh, NFS_FH(inode));
4216         nfs4_stateid_copy(&data->stateid, stateid);
4217         data->res.fattr = &data->fattr;
4218         data->res.server = server;
4219         nfs_fattr_init(data->res.fattr);
4220         data->timestamp = jiffies;
4221         data->rpc_status = 0;
4222
4223         task_setup_data.callback_data = data;
4224         msg.rpc_argp = &data->args;
4225         msg.rpc_resp = &data->res;
4226         task = rpc_run_task(&task_setup_data);
4227         if (IS_ERR(task))
4228                 return PTR_ERR(task);
4229         if (!issync)
4230                 goto out;
4231         status = nfs4_wait_for_completion_rpc_task(task);
4232         if (status != 0)
4233                 goto out;
4234         status = data->rpc_status;
4235         if (status == 0)
4236                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
4237         else
4238                 nfs_refresh_inode(inode, &data->fattr);
4239 out:
4240         rpc_put_task(task);
4241         return status;
4242 }
4243
4244 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
4245 {
4246         struct nfs_server *server = NFS_SERVER(inode);
4247         struct nfs4_exception exception = { };
4248         int err;
4249         do {
4250                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
4251                 switch (err) {
4252                         case -NFS4ERR_STALE_STATEID:
4253                         case -NFS4ERR_EXPIRED:
4254                         case 0:
4255                                 return 0;
4256                 }
4257                 err = nfs4_handle_exception(server, err, &exception);
4258         } while (exception.retry);
4259         return err;
4260 }
4261
4262 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
4263 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
4264
4265 /*
4266  * sleep, with exponential backoff, and retry the LOCK operation.
4267  */
4268 static unsigned long
4269 nfs4_set_lock_task_retry(unsigned long timeout)
4270 {
4271         freezable_schedule_timeout_killable(timeout);
4272         timeout <<= 1;
4273         if (timeout > NFS4_LOCK_MAXTIMEOUT)
4274                 return NFS4_LOCK_MAXTIMEOUT;
4275         return timeout;
4276 }
4277
4278 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4279 {
4280         struct inode *inode = state->inode;
4281         struct nfs_server *server = NFS_SERVER(inode);
4282         struct nfs_client *clp = server->nfs_client;
4283         struct nfs_lockt_args arg = {
4284                 .fh = NFS_FH(inode),
4285                 .fl = request,
4286         };
4287         struct nfs_lockt_res res = {
4288                 .denied = request,
4289         };
4290         struct rpc_message msg = {
4291                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
4292                 .rpc_argp       = &arg,
4293                 .rpc_resp       = &res,
4294                 .rpc_cred       = state->owner->so_cred,
4295         };
4296         struct nfs4_lock_state *lsp;
4297         int status;
4298
4299         arg.lock_owner.clientid = clp->cl_clientid;
4300         status = nfs4_set_lock_state(state, request);
4301         if (status != 0)
4302                 goto out;
4303         lsp = request->fl_u.nfs4_fl.owner;
4304         arg.lock_owner.id = lsp->ls_seqid.owner_id;
4305         arg.lock_owner.s_dev = server->s_dev;
4306         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4307         switch (status) {
4308                 case 0:
4309                         request->fl_type = F_UNLCK;
4310                         break;
4311                 case -NFS4ERR_DENIED:
4312                         status = 0;
4313         }
4314         request->fl_ops->fl_release_private(request);
4315 out:
4316         return status;
4317 }
4318
4319 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4320 {
4321         struct nfs4_exception exception = { };
4322         int err;
4323
4324         do {
4325                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4326                                 _nfs4_proc_getlk(state, cmd, request),
4327                                 &exception);
4328         } while (exception.retry);
4329         return err;
4330 }
4331
4332 static int do_vfs_lock(struct file *file, struct file_lock *fl)
4333 {
4334         int res = 0;
4335         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
4336                 case FL_POSIX:
4337                         res = posix_lock_file_wait(file, fl);
4338                         break;
4339                 case FL_FLOCK:
4340                         res = flock_lock_file_wait(file, fl);
4341                         break;
4342                 default:
4343                         BUG();
4344         }
4345         return res;
4346 }
4347
4348 struct nfs4_unlockdata {
4349         struct nfs_locku_args arg;
4350         struct nfs_locku_res res;
4351         struct nfs4_lock_state *lsp;
4352         struct nfs_open_context *ctx;
4353         struct file_lock fl;
4354         const struct nfs_server *server;
4355         unsigned long timestamp;
4356 };
4357
4358 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
4359                 struct nfs_open_context *ctx,
4360                 struct nfs4_lock_state *lsp,
4361                 struct nfs_seqid *seqid)
4362 {
4363         struct nfs4_unlockdata *p;
4364         struct inode *inode = lsp->ls_state->inode;
4365
4366         p = kzalloc(sizeof(*p), GFP_NOFS);
4367         if (p == NULL)
4368                 return NULL;
4369         p->arg.fh = NFS_FH(inode);
4370         p->arg.fl = &p->fl;
4371         p->arg.seqid = seqid;
4372         p->res.seqid = seqid;
4373         p->arg.stateid = &lsp->ls_stateid;
4374         p->lsp = lsp;
4375         atomic_inc(&lsp->ls_count);
4376         /* Ensure we don't close file until we're done freeing locks! */
4377         p->ctx = get_nfs_open_context(ctx);
4378         memcpy(&p->fl, fl, sizeof(p->fl));
4379         p->server = NFS_SERVER(inode);
4380         return p;
4381 }
4382
4383 static void nfs4_locku_release_calldata(void *data)
4384 {
4385         struct nfs4_unlockdata *calldata = data;
4386         nfs_free_seqid(calldata->arg.seqid);
4387         nfs4_put_lock_state(calldata->lsp);
4388         put_nfs_open_context(calldata->ctx);
4389         kfree(calldata);
4390 }
4391
4392 static void nfs4_locku_done(struct rpc_task *task, void *data)
4393 {
4394         struct nfs4_unlockdata *calldata = data;
4395
4396         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
4397                 return;
4398         switch (task->tk_status) {
4399                 case 0:
4400                         nfs4_stateid_copy(&calldata->lsp->ls_stateid,
4401                                         &calldata->res.stateid);
4402                         renew_lease(calldata->server, calldata->timestamp);
4403                         break;
4404                 case -NFS4ERR_BAD_STATEID:
4405                 case -NFS4ERR_OLD_STATEID:
4406                 case -NFS4ERR_STALE_STATEID:
4407                 case -NFS4ERR_EXPIRED:
4408                         break;
4409                 default:
4410                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
4411                                 rpc_restart_call_prepare(task);
4412         }
4413         nfs_release_seqid(calldata->arg.seqid);
4414 }
4415
4416 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
4417 {
4418         struct nfs4_unlockdata *calldata = data;
4419
4420         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
4421                 return;
4422         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
4423                 /* Note: exit _without_ running nfs4_locku_done */
4424                 task->tk_action = NULL;
4425                 return;
4426         }
4427         calldata->timestamp = jiffies;
4428         if (nfs4_setup_sequence(calldata->server,
4429                                 &calldata->arg.seq_args,
4430                                 &calldata->res.seq_res,
4431                                 task) != 0)
4432                 nfs_release_seqid(calldata->arg.seqid);
4433         else
4434                 rpc_call_start(task);
4435 }
4436
4437 static const struct rpc_call_ops nfs4_locku_ops = {
4438         .rpc_call_prepare = nfs4_locku_prepare,
4439         .rpc_call_done = nfs4_locku_done,
4440         .rpc_release = nfs4_locku_release_calldata,
4441 };
4442
4443 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
4444                 struct nfs_open_context *ctx,
4445                 struct nfs4_lock_state *lsp,
4446                 struct nfs_seqid *seqid)
4447 {
4448         struct nfs4_unlockdata *data;
4449         struct rpc_message msg = {
4450                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
4451                 .rpc_cred = ctx->cred,
4452         };
4453         struct rpc_task_setup task_setup_data = {
4454                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
4455                 .rpc_message = &msg,
4456                 .callback_ops = &nfs4_locku_ops,
4457                 .workqueue = nfsiod_workqueue,
4458                 .flags = RPC_TASK_ASYNC,
4459         };
4460
4461         /* Ensure this is an unlock - when canceling a lock, the
4462          * canceled lock is passed in, and it won't be an unlock.
4463          */
4464         fl->fl_type = F_UNLCK;
4465
4466         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
4467         if (data == NULL) {
4468                 nfs_free_seqid(seqid);
4469                 return ERR_PTR(-ENOMEM);
4470         }
4471
4472         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4473         msg.rpc_argp = &data->arg;
4474         msg.rpc_resp = &data->res;
4475         task_setup_data.callback_data = data;
4476         return rpc_run_task(&task_setup_data);
4477 }
4478
4479 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
4480 {
4481         struct nfs_inode *nfsi = NFS_I(state->inode);
4482         struct nfs_seqid *seqid;
4483         struct nfs4_lock_state *lsp;
4484         struct rpc_task *task;
4485         int status = 0;
4486         unsigned char fl_flags = request->fl_flags;
4487
4488         status = nfs4_set_lock_state(state, request);
4489         /* Unlock _before_ we do the RPC call */
4490         request->fl_flags |= FL_EXISTS;
4491         down_read(&nfsi->rwsem);
4492         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
4493                 up_read(&nfsi->rwsem);
4494                 goto out;
4495         }
4496         up_read(&nfsi->rwsem);
4497         if (status != 0)
4498                 goto out;
4499         /* Is this a delegated lock? */
4500         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
4501                 goto out;
4502         lsp = request->fl_u.nfs4_fl.owner;
4503         seqid = nfs_alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
4504         status = -ENOMEM;
4505         if (seqid == NULL)
4506                 goto out;
4507         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
4508         status = PTR_ERR(task);
4509         if (IS_ERR(task))
4510                 goto out;
4511         status = nfs4_wait_for_completion_rpc_task(task);
4512         rpc_put_task(task);
4513 out:
4514         request->fl_flags = fl_flags;
4515         return status;
4516 }
4517
4518 struct nfs4_lockdata {
4519         struct nfs_lock_args arg;
4520         struct nfs_lock_res res;
4521         struct nfs4_lock_state *lsp;
4522         struct nfs_open_context *ctx;
4523         struct file_lock fl;
4524         unsigned long timestamp;
4525         int rpc_status;
4526         int cancelled;
4527         struct nfs_server *server;
4528 };
4529
4530 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
4531                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
4532                 gfp_t gfp_mask)
4533 {
4534         struct nfs4_lockdata *p;
4535         struct inode *inode = lsp->ls_state->inode;
4536         struct nfs_server *server = NFS_SERVER(inode);
4537
4538         p = kzalloc(sizeof(*p), gfp_mask);
4539         if (p == NULL)
4540                 return NULL;
4541
4542         p->arg.fh = NFS_FH(inode);
4543         p->arg.fl = &p->fl;
4544         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
4545         if (p->arg.open_seqid == NULL)
4546                 goto out_free;
4547         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid, gfp_mask);
4548         if (p->arg.lock_seqid == NULL)
4549                 goto out_free_seqid;
4550         p->arg.lock_stateid = &lsp->ls_stateid;
4551         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
4552         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
4553         p->arg.lock_owner.s_dev = server->s_dev;
4554         p->res.lock_seqid = p->arg.lock_seqid;
4555         p->lsp = lsp;
4556         p->server = server;
4557         atomic_inc(&lsp->ls_count);
4558         p->ctx = get_nfs_open_context(ctx);
4559         memcpy(&p->fl, fl, sizeof(p->fl));
4560         return p;
4561 out_free_seqid:
4562         nfs_free_seqid(p->arg.open_seqid);
4563 out_free:
4564         kfree(p);
4565         return NULL;
4566 }
4567
4568 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
4569 {
4570         struct nfs4_lockdata *data = calldata;
4571         struct nfs4_state *state = data->lsp->ls_state;
4572
4573         dprintk("%s: begin!\n", __func__);
4574         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
4575                 return;
4576         /* Do we need to do an open_to_lock_owner? */
4577         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
4578                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
4579                         goto out_release_lock_seqid;
4580                 data->arg.open_stateid = &state->stateid;
4581                 data->arg.new_lock_owner = 1;
4582                 data->res.open_seqid = data->arg.open_seqid;
4583         } else
4584                 data->arg.new_lock_owner = 0;
4585         data->timestamp = jiffies;
4586         if (nfs4_setup_sequence(data->server,
4587                                 &data->arg.seq_args,
4588                                 &data->res.seq_res,
4589                                 task) == 0) {
4590                 rpc_call_start(task);
4591                 return;
4592         }
4593         nfs_release_seqid(data->arg.open_seqid);
4594 out_release_lock_seqid:
4595         nfs_release_seqid(data->arg.lock_seqid);
4596         dprintk("%s: done!, ret = %d\n", __func__, task->tk_status);
4597 }
4598
4599 static void nfs4_recover_lock_prepare(struct rpc_task *task, void *calldata)
4600 {
4601         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
4602         nfs4_lock_prepare(task, calldata);
4603 }
4604
4605 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
4606 {
4607         struct nfs4_lockdata *data = calldata;
4608
4609         dprintk("%s: begin!\n", __func__);
4610
4611         if (!nfs4_sequence_done(task, &data->res.seq_res))
4612                 return;
4613
4614         data->rpc_status = task->tk_status;
4615         if (data->arg.new_lock_owner != 0) {
4616                 if (data->rpc_status == 0)
4617                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
4618                 else
4619                         goto out;
4620         }
4621         if (data->rpc_status == 0) {
4622                 nfs4_stateid_copy(&data->lsp->ls_stateid, &data->res.stateid);
4623                 set_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags);
4624                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
4625         }
4626 out:
4627         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
4628 }
4629
4630 static void nfs4_lock_release(void *calldata)
4631 {
4632         struct nfs4_lockdata *data = calldata;
4633
4634         dprintk("%s: begin!\n", __func__);
4635         nfs_free_seqid(data->arg.open_seqid);
4636         if (data->cancelled != 0) {
4637                 struct rpc_task *task;
4638                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
4639                                 data->arg.lock_seqid);
4640                 if (!IS_ERR(task))
4641                         rpc_put_task_async(task);
4642                 dprintk("%s: cancelling lock!\n", __func__);
4643         } else
4644                 nfs_free_seqid(data->arg.lock_seqid);
4645         nfs4_put_lock_state(data->lsp);
4646         put_nfs_open_context(data->ctx);
4647         kfree(data);
4648         dprintk("%s: done!\n", __func__);
4649 }
4650
4651 static const struct rpc_call_ops nfs4_lock_ops = {
4652         .rpc_call_prepare = nfs4_lock_prepare,
4653         .rpc_call_done = nfs4_lock_done,
4654         .rpc_release = nfs4_lock_release,
4655 };
4656
4657 static const struct rpc_call_ops nfs4_recover_lock_ops = {
4658         .rpc_call_prepare = nfs4_recover_lock_prepare,
4659         .rpc_call_done = nfs4_lock_done,
4660         .rpc_release = nfs4_lock_release,
4661 };
4662
4663 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
4664 {
4665         switch (error) {
4666         case -NFS4ERR_ADMIN_REVOKED:
4667         case -NFS4ERR_BAD_STATEID:
4668                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4669                 if (new_lock_owner != 0 ||
4670                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
4671                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
4672                 break;
4673         case -NFS4ERR_STALE_STATEID:
4674                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
4675         case -NFS4ERR_EXPIRED:
4676                 nfs4_schedule_lease_recovery(server->nfs_client);
4677         };
4678 }
4679
4680 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
4681 {
4682         struct nfs4_lockdata *data;
4683         struct rpc_task *task;
4684         struct rpc_message msg = {
4685                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
4686                 .rpc_cred = state->owner->so_cred,
4687         };
4688         struct rpc_task_setup task_setup_data = {
4689                 .rpc_client = NFS_CLIENT(state->inode),
4690                 .rpc_message = &msg,
4691                 .callback_ops = &nfs4_lock_ops,
4692                 .workqueue = nfsiod_workqueue,
4693                 .flags = RPC_TASK_ASYNC,
4694         };
4695         int ret;
4696
4697         dprintk("%s: begin!\n", __func__);
4698         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
4699                         fl->fl_u.nfs4_fl.owner,
4700                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
4701         if (data == NULL)
4702                 return -ENOMEM;
4703         if (IS_SETLKW(cmd))
4704                 data->arg.block = 1;
4705         if (recovery_type > NFS_LOCK_NEW) {
4706                 if (recovery_type == NFS_LOCK_RECLAIM)
4707                         data->arg.reclaim = NFS_LOCK_RECLAIM;
4708                 task_setup_data.callback_ops = &nfs4_recover_lock_ops;
4709         }
4710         nfs41_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
4711         msg.rpc_argp = &data->arg;
4712         msg.rpc_resp = &data->res;
4713         task_setup_data.callback_data = data;
4714         task = rpc_run_task(&task_setup_data);
4715         if (IS_ERR(task))
4716                 return PTR_ERR(task);
4717         ret = nfs4_wait_for_completion_rpc_task(task);
4718         if (ret == 0) {
4719                 ret = data->rpc_status;
4720                 if (ret)
4721                         nfs4_handle_setlk_error(data->server, data->lsp,
4722                                         data->arg.new_lock_owner, ret);
4723         } else
4724                 data->cancelled = 1;
4725         rpc_put_task(task);
4726         dprintk("%s: done, ret = %d!\n", __func__, ret);
4727         return ret;
4728 }
4729
4730 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
4731 {
4732         struct nfs_server *server = NFS_SERVER(state->inode);
4733         struct nfs4_exception exception = {
4734                 .inode = state->inode,
4735         };
4736         int err;
4737
4738         do {
4739                 /* Cache the lock if possible... */
4740                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4741                         return 0;
4742                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
4743                 if (err != -NFS4ERR_DELAY)
4744                         break;
4745                 nfs4_handle_exception(server, err, &exception);
4746         } while (exception.retry);
4747         return err;
4748 }
4749
4750 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
4751 {
4752         struct nfs_server *server = NFS_SERVER(state->inode);
4753         struct nfs4_exception exception = {
4754                 .inode = state->inode,
4755         };
4756         int err;
4757
4758         err = nfs4_set_lock_state(state, request);
4759         if (err != 0)
4760                 return err;
4761         do {
4762                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
4763                         return 0;
4764                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
4765                 switch (err) {
4766                 default:
4767                         goto out;
4768                 case -NFS4ERR_GRACE:
4769                 case -NFS4ERR_DELAY:
4770                         nfs4_handle_exception(server, err, &exception);
4771                         err = 0;
4772                 }
4773         } while (exception.retry);
4774 out:
4775         return err;
4776 }
4777
4778 #if defined(CONFIG_NFS_V4_1)
4779 /**
4780  * nfs41_check_expired_locks - possibly free a lock stateid
4781  *
4782  * @state: NFSv4 state for an inode
4783  *
4784  * Returns NFS_OK if recovery for this stateid is now finished.
4785  * Otherwise a negative NFS4ERR value is returned.
4786  */
4787 static int nfs41_check_expired_locks(struct nfs4_state *state)
4788 {
4789         int status, ret = -NFS4ERR_BAD_STATEID;
4790         struct nfs4_lock_state *lsp;
4791         struct nfs_server *server = NFS_SERVER(state->inode);
4792
4793         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
4794                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
4795                         status = nfs41_test_stateid(server, &lsp->ls_stateid);
4796                         if (status != NFS_OK) {
4797                                 /* Free the stateid unless the server
4798                                  * informs us the stateid is unrecognized. */
4799                                 if (status != -NFS4ERR_BAD_STATEID)
4800                                         nfs41_free_stateid(server,
4801                                                         &lsp->ls_stateid);
4802                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
4803                                 ret = status;
4804                         }
4805                 }
4806         };
4807
4808         return ret;
4809 }
4810
4811 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
4812 {
4813         int status = NFS_OK;
4814
4815         if (test_bit(LK_STATE_IN_USE, &state->flags))
4816                 status = nfs41_check_expired_locks(state);
4817         if (status != NFS_OK)
4818                 status = nfs4_lock_expired(state, request);
4819         return status;
4820 }
4821 #endif
4822
4823 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4824 {
4825         struct nfs_inode *nfsi = NFS_I(state->inode);
4826         unsigned char fl_flags = request->fl_flags;
4827         int status = -ENOLCK;
4828
4829         if ((fl_flags & FL_POSIX) &&
4830                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
4831                 goto out;
4832         /* Is this a delegated open? */
4833         status = nfs4_set_lock_state(state, request);
4834         if (status != 0)
4835                 goto out;
4836         request->fl_flags |= FL_ACCESS;
4837         status = do_vfs_lock(request->fl_file, request);
4838         if (status < 0)
4839                 goto out;
4840         down_read(&nfsi->rwsem);
4841         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
4842                 /* Yes: cache locks! */
4843                 /* ...but avoid races with delegation recall... */
4844                 request->fl_flags = fl_flags & ~FL_SLEEP;
4845                 status = do_vfs_lock(request->fl_file, request);
4846                 goto out_unlock;
4847         }
4848         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
4849         if (status != 0)
4850                 goto out_unlock;
4851         /* Note: we always want to sleep here! */
4852         request->fl_flags = fl_flags | FL_SLEEP;
4853         if (do_vfs_lock(request->fl_file, request) < 0)
4854                 printk(KERN_WARNING "NFS: %s: VFS is out of sync with lock "
4855                         "manager!\n", __func__);
4856 out_unlock:
4857         up_read(&nfsi->rwsem);
4858 out:
4859         request->fl_flags = fl_flags;
4860         return status;
4861 }
4862
4863 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
4864 {
4865         struct nfs4_exception exception = {
4866                 .state = state,
4867                 .inode = state->inode,
4868         };
4869         int err;
4870
4871         do {
4872                 err = _nfs4_proc_setlk(state, cmd, request);
4873                 if (err == -NFS4ERR_DENIED)
4874                         err = -EAGAIN;
4875                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
4876                                 err, &exception);
4877         } while (exception.retry);
4878         return err;
4879 }
4880
4881 static int
4882 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
4883 {
4884         struct nfs_open_context *ctx;
4885         struct nfs4_state *state;
4886         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
4887         int status;
4888
4889         /* verify open state */
4890         ctx = nfs_file_open_context(filp);
4891         state = ctx->state;
4892
4893         if (request->fl_start < 0 || request->fl_end < 0)
4894                 return -EINVAL;
4895
4896         if (IS_GETLK(cmd)) {
4897                 if (state != NULL)
4898                         return nfs4_proc_getlk(state, F_GETLK, request);
4899                 return 0;
4900         }
4901
4902         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
4903                 return -EINVAL;
4904
4905         if (request->fl_type == F_UNLCK) {
4906                 if (state != NULL)
4907                         return nfs4_proc_unlck(state, cmd, request);
4908                 return 0;
4909         }
4910
4911         if (state == NULL)
4912                 return -ENOLCK;
4913         /*
4914          * Don't rely on the VFS having checked the file open mode,
4915          * since it won't do this for flock() locks.
4916          */
4917         switch (request->fl_type) {
4918         case F_RDLCK:
4919                 if (!(filp->f_mode & FMODE_READ))
4920                         return -EBADF;
4921                 break;
4922         case F_WRLCK:
4923                 if (!(filp->f_mode & FMODE_WRITE))
4924                         return -EBADF;
4925         }
4926
4927         do {
4928                 status = nfs4_proc_setlk(state, cmd, request);
4929                 if ((status != -EAGAIN) || IS_SETLK(cmd))
4930                         break;
4931                 timeout = nfs4_set_lock_task_retry(timeout);
4932                 status = -ERESTARTSYS;
4933                 if (signalled())
4934                         break;
4935         } while(status < 0);
4936         return status;
4937 }
4938
4939 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
4940 {
4941         struct nfs_server *server = NFS_SERVER(state->inode);
4942         struct nfs4_exception exception = { };
4943         int err;
4944
4945         err = nfs4_set_lock_state(state, fl);
4946         if (err != 0)
4947                 goto out;
4948         do {
4949                 err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
4950                 switch (err) {
4951                         default:
4952                                 printk(KERN_ERR "NFS: %s: unhandled error "
4953                                         "%d.\n", __func__, err);
4954                         case 0:
4955                         case -ESTALE:
4956                                 goto out;
4957                         case -NFS4ERR_EXPIRED:
4958                                 nfs4_schedule_stateid_recovery(server, state);
4959                         case -NFS4ERR_STALE_CLIENTID:
4960                         case -NFS4ERR_STALE_STATEID:
4961                                 nfs4_schedule_lease_recovery(server->nfs_client);
4962                                 goto out;
4963                         case -NFS4ERR_BADSESSION:
4964                         case -NFS4ERR_BADSLOT:
4965                         case -NFS4ERR_BAD_HIGH_SLOT:
4966                         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4967                         case -NFS4ERR_DEADSESSION:
4968                                 nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
4969                                 goto out;
4970                         case -ERESTARTSYS:
4971                                 /*
4972                                  * The show must go on: exit, but mark the
4973                                  * stateid as needing recovery.
4974                                  */
4975                         case -NFS4ERR_DELEG_REVOKED:
4976                         case -NFS4ERR_ADMIN_REVOKED:
4977                         case -NFS4ERR_BAD_STATEID:
4978                         case -NFS4ERR_OPENMODE:
4979                                 nfs4_schedule_stateid_recovery(server, state);
4980                                 err = 0;
4981                                 goto out;
4982                         case -EKEYEXPIRED:
4983                                 /*
4984                                  * User RPCSEC_GSS context has expired.
4985                                  * We cannot recover this stateid now, so
4986                                  * skip it and allow recovery thread to
4987                                  * proceed.
4988                                  */
4989                                 err = 0;
4990                                 goto out;
4991                         case -ENOMEM:
4992                         case -NFS4ERR_DENIED:
4993                                 /* kill_proc(fl->fl_pid, SIGLOST, 1); */
4994                                 err = 0;
4995                                 goto out;
4996                         case -NFS4ERR_DELAY:
4997                                 break;
4998                 }
4999                 err = nfs4_handle_exception(server, err, &exception);
5000         } while (exception.retry);
5001 out:
5002         return err;
5003 }
5004
5005 struct nfs_release_lockowner_data {
5006         struct nfs4_lock_state *lsp;
5007         struct nfs_server *server;
5008         struct nfs_release_lockowner_args args;
5009 };
5010
5011 static void nfs4_release_lockowner_release(void *calldata)
5012 {
5013         struct nfs_release_lockowner_data *data = calldata;
5014         nfs4_free_lock_state(data->server, data->lsp);
5015         kfree(calldata);
5016 }
5017
5018 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
5019         .rpc_release = nfs4_release_lockowner_release,
5020 };
5021
5022 int nfs4_release_lockowner(struct nfs4_lock_state *lsp)
5023 {
5024         struct nfs_server *server = lsp->ls_state->owner->so_server;
5025         struct nfs_release_lockowner_data *data;
5026         struct rpc_message msg = {
5027                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
5028         };
5029
5030         if (server->nfs_client->cl_mvops->minor_version != 0)
5031                 return -EINVAL;
5032         data = kmalloc(sizeof(*data), GFP_NOFS);
5033         if (!data)
5034                 return -ENOMEM;
5035         data->lsp = lsp;
5036         data->server = server;
5037         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
5038         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
5039         data->args.lock_owner.s_dev = server->s_dev;
5040         msg.rpc_argp = &data->args;
5041         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
5042         return 0;
5043 }
5044
5045 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
5046
5047 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
5048                                    const void *buf, size_t buflen,
5049                                    int flags, int type)
5050 {
5051         if (strcmp(key, "") != 0)
5052                 return -EINVAL;
5053
5054         return nfs4_proc_set_acl(dentry->d_inode, buf, buflen);
5055 }
5056
5057 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
5058                                    void *buf, size_t buflen, int type)
5059 {
5060         if (strcmp(key, "") != 0)
5061                 return -EINVAL;
5062
5063         return nfs4_proc_get_acl(dentry->d_inode, buf, buflen);
5064 }
5065
5066 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
5067                                        size_t list_len, const char *name,
5068                                        size_t name_len, int type)
5069 {
5070         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
5071
5072         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
5073                 return 0;
5074
5075         if (list && len <= list_len)
5076                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
5077         return len;
5078 }
5079
5080 /*
5081  * nfs_fhget will use either the mounted_on_fileid or the fileid
5082  */
5083 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
5084 {
5085         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
5086                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
5087               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
5088               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
5089                 return;
5090
5091         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
5092                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
5093         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
5094         fattr->nlink = 2;
5095 }
5096
5097 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5098                                    const struct qstr *name,
5099                                    struct nfs4_fs_locations *fs_locations,
5100                                    struct page *page)
5101 {
5102         struct nfs_server *server = NFS_SERVER(dir);
5103         u32 bitmask[2] = {
5104                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
5105         };
5106         struct nfs4_fs_locations_arg args = {
5107                 .dir_fh = NFS_FH(dir),
5108                 .name = name,
5109                 .page = page,
5110                 .bitmask = bitmask,
5111         };
5112         struct nfs4_fs_locations_res res = {
5113                 .fs_locations = fs_locations,
5114         };
5115         struct rpc_message msg = {
5116                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
5117                 .rpc_argp = &args,
5118                 .rpc_resp = &res,
5119         };
5120         int status;
5121
5122         dprintk("%s: start\n", __func__);
5123
5124         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
5125          * is not supported */
5126         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
5127                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
5128         else
5129                 bitmask[0] |= FATTR4_WORD0_FILEID;
5130
5131         nfs_fattr_init(&fs_locations->fattr);
5132         fs_locations->server = server;
5133         fs_locations->nlocations = 0;
5134         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
5135         dprintk("%s: returned status = %d\n", __func__, status);
5136         return status;
5137 }
5138
5139 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
5140                            const struct qstr *name,
5141                            struct nfs4_fs_locations *fs_locations,
5142                            struct page *page)
5143 {
5144         struct nfs4_exception exception = { };
5145         int err;
5146         do {
5147                 err = nfs4_handle_exception(NFS_SERVER(dir),
5148                                 _nfs4_proc_fs_locations(client, dir, name, fs_locations, page),
5149                                 &exception);
5150         } while (exception.retry);
5151         return err;
5152 }
5153
5154 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors)
5155 {
5156         int status;
5157         struct nfs4_secinfo_arg args = {
5158                 .dir_fh = NFS_FH(dir),
5159                 .name   = name,
5160         };
5161         struct nfs4_secinfo_res res = {
5162                 .flavors     = flavors,
5163         };
5164         struct rpc_message msg = {
5165                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
5166                 .rpc_argp = &args,
5167                 .rpc_resp = &res,
5168         };
5169
5170         dprintk("NFS call  secinfo %s\n", name->name);
5171         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
5172         dprintk("NFS reply  secinfo: %d\n", status);
5173         return status;
5174 }
5175
5176 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
5177                       struct nfs4_secinfo_flavors *flavors)
5178 {
5179         struct nfs4_exception exception = { };
5180         int err;
5181         do {
5182                 err = nfs4_handle_exception(NFS_SERVER(dir),
5183                                 _nfs4_proc_secinfo(dir, name, flavors),
5184                                 &exception);
5185         } while (exception.retry);
5186         return err;
5187 }
5188
5189 #ifdef CONFIG_NFS_V4_1
5190 /*
5191  * Check the exchange flags returned by the server for invalid flags, having
5192  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
5193  * DS flags set.
5194  */
5195 static int nfs4_check_cl_exchange_flags(u32 flags)
5196 {
5197         if (flags & ~EXCHGID4_FLAG_MASK_R)
5198                 goto out_inval;
5199         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
5200             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
5201                 goto out_inval;
5202         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
5203                 goto out_inval;
5204         return NFS_OK;
5205 out_inval:
5206         return -NFS4ERR_INVAL;
5207 }
5208
5209 static bool
5210 nfs41_same_server_scope(struct nfs41_server_scope *a,
5211                         struct nfs41_server_scope *b)
5212 {
5213         if (a->server_scope_sz == b->server_scope_sz &&
5214             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
5215                 return true;
5216
5217         return false;
5218 }
5219
5220 /*
5221  * nfs4_proc_bind_conn_to_session()
5222  *
5223  * The 4.1 client currently uses the same TCP connection for the
5224  * fore and backchannel.
5225  */
5226 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
5227 {
5228         int status;
5229         struct nfs41_bind_conn_to_session_res res;
5230         struct rpc_message msg = {
5231                 .rpc_proc =
5232                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
5233                 .rpc_argp = clp,
5234                 .rpc_resp = &res,
5235                 .rpc_cred = cred,
5236         };
5237
5238         dprintk("--> %s\n", __func__);
5239
5240         res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
5241         if (unlikely(res.session == NULL)) {
5242                 status = -ENOMEM;
5243                 goto out;
5244         }
5245
5246         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5247         if (status == 0) {
5248                 if (memcmp(res.session->sess_id.data,
5249                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
5250                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
5251                         status = -EIO;
5252                         goto out_session;
5253                 }
5254                 if (res.dir != NFS4_CDFS4_BOTH) {
5255                         dprintk("NFS: %s: Unexpected direction from server\n",
5256                                 __func__);
5257                         status = -EIO;
5258                         goto out_session;
5259                 }
5260                 if (res.use_conn_in_rdma_mode) {
5261                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
5262                                 __func__);
5263                         status = -EIO;
5264                         goto out_session;
5265                 }
5266         }
5267 out_session:
5268         kfree(res.session);
5269 out:
5270         dprintk("<-- %s status= %d\n", __func__, status);
5271         return status;
5272 }
5273
5274 /*
5275  * nfs4_proc_exchange_id()
5276  *
5277  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5278  *
5279  * Since the clientid has expired, all compounds using sessions
5280  * associated with the stale clientid will be returning
5281  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
5282  * be in some phase of session reset.
5283  */
5284 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
5285 {
5286         nfs4_verifier verifier;
5287         struct nfs41_exchange_id_args args = {
5288                 .verifier = &verifier,
5289                 .client = clp,
5290                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER,
5291         };
5292         struct nfs41_exchange_id_res res = {
5293                 0
5294         };
5295         int status;
5296         struct rpc_message msg = {
5297                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
5298                 .rpc_argp = &args,
5299                 .rpc_resp = &res,
5300                 .rpc_cred = cred,
5301         };
5302
5303         nfs4_init_boot_verifier(clp, &verifier);
5304         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
5305                                                         sizeof(args.id));
5306         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
5307                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5308                 args.id_len, args.id);
5309
5310         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
5311                                         GFP_NOFS);
5312         if (unlikely(res.server_owner == NULL)) {
5313                 status = -ENOMEM;
5314                 goto out;
5315         }
5316
5317         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
5318                                         GFP_NOFS);
5319         if (unlikely(res.server_scope == NULL)) {
5320                 status = -ENOMEM;
5321                 goto out_server_owner;
5322         }
5323
5324         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
5325         if (unlikely(res.impl_id == NULL)) {
5326                 status = -ENOMEM;
5327                 goto out_server_scope;
5328         }
5329
5330         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5331         if (status == 0)
5332                 status = nfs4_check_cl_exchange_flags(res.flags);
5333
5334         if (status == 0) {
5335                 clp->cl_clientid = res.clientid;
5336                 clp->cl_exchange_flags = (res.flags & ~EXCHGID4_FLAG_CONFIRMED_R);
5337                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R))
5338                         clp->cl_seqid = res.seqid;
5339
5340                 kfree(clp->cl_serverowner);
5341                 clp->cl_serverowner = res.server_owner;
5342                 res.server_owner = NULL;
5343
5344                 /* use the most recent implementation id */
5345                 kfree(clp->cl_implid);
5346                 clp->cl_implid = res.impl_id;
5347
5348                 if (clp->cl_serverscope != NULL &&
5349                     !nfs41_same_server_scope(clp->cl_serverscope,
5350                                              res.server_scope)) {
5351                         dprintk("%s: server_scope mismatch detected\n",
5352                                 __func__);
5353                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
5354                         kfree(clp->cl_serverscope);
5355                         clp->cl_serverscope = NULL;
5356                 }
5357
5358                 if (clp->cl_serverscope == NULL) {
5359                         clp->cl_serverscope = res.server_scope;
5360                         goto out;
5361                 }
5362         } else
5363                 kfree(res.impl_id);
5364
5365 out_server_owner:
5366         kfree(res.server_owner);
5367 out_server_scope:
5368         kfree(res.server_scope);
5369 out:
5370         if (clp->cl_implid != NULL)
5371                 dprintk("NFS reply exchange_id: Server Implementation ID: "
5372                         "domain: %s, name: %s, date: %llu,%u\n",
5373                         clp->cl_implid->domain, clp->cl_implid->name,
5374                         clp->cl_implid->date.seconds,
5375                         clp->cl_implid->date.nseconds);
5376         dprintk("NFS reply exchange_id: %d\n", status);
5377         return status;
5378 }
5379
5380 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
5381                 struct rpc_cred *cred)
5382 {
5383         struct rpc_message msg = {
5384                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
5385                 .rpc_argp = clp,
5386                 .rpc_cred = cred,
5387         };
5388         int status;
5389
5390         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5391         if (status)
5392                 dprintk("NFS: Got error %d from the server %s on "
5393                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
5394         return status;
5395 }
5396
5397 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
5398                 struct rpc_cred *cred)
5399 {
5400         unsigned int loop;
5401         int ret;
5402
5403         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
5404                 ret = _nfs4_proc_destroy_clientid(clp, cred);
5405                 switch (ret) {
5406                 case -NFS4ERR_DELAY:
5407                 case -NFS4ERR_CLIENTID_BUSY:
5408                         ssleep(1);
5409                         break;
5410                 default:
5411                         return ret;
5412                 }
5413         }
5414         return 0;
5415 }
5416
5417 int nfs4_destroy_clientid(struct nfs_client *clp)
5418 {
5419         struct rpc_cred *cred;
5420         int ret = 0;
5421
5422         if (clp->cl_mvops->minor_version < 1)
5423                 goto out;
5424         if (clp->cl_exchange_flags == 0)
5425                 goto out;
5426         if (clp->cl_preserve_clid)
5427                 goto out;
5428         cred = nfs4_get_exchange_id_cred(clp);
5429         ret = nfs4_proc_destroy_clientid(clp, cred);
5430         if (cred)
5431                 put_rpccred(cred);
5432         switch (ret) {
5433         case 0:
5434         case -NFS4ERR_STALE_CLIENTID:
5435                 clp->cl_exchange_flags = 0;
5436         }
5437 out:
5438         return ret;
5439 }
5440
5441 struct nfs4_get_lease_time_data {
5442         struct nfs4_get_lease_time_args *args;
5443         struct nfs4_get_lease_time_res *res;
5444         struct nfs_client *clp;
5445 };
5446
5447 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
5448                                         void *calldata)
5449 {
5450         int ret;
5451         struct nfs4_get_lease_time_data *data =
5452                         (struct nfs4_get_lease_time_data *)calldata;
5453
5454         dprintk("--> %s\n", __func__);
5455         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5456         /* just setup sequence, do not trigger session recovery
5457            since we're invoked within one */
5458         ret = nfs41_setup_sequence(data->clp->cl_session,
5459                                    &data->args->la_seq_args,
5460                                    &data->res->lr_seq_res, task);
5461
5462         if (ret != -EAGAIN)
5463                 rpc_call_start(task);
5464         dprintk("<-- %s\n", __func__);
5465 }
5466
5467 /*
5468  * Called from nfs4_state_manager thread for session setup, so don't recover
5469  * from sequence operation or clientid errors.
5470  */
5471 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
5472 {
5473         struct nfs4_get_lease_time_data *data =
5474                         (struct nfs4_get_lease_time_data *)calldata;
5475
5476         dprintk("--> %s\n", __func__);
5477         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
5478                 return;
5479         switch (task->tk_status) {
5480         case -NFS4ERR_DELAY:
5481         case -NFS4ERR_GRACE:
5482                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
5483                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
5484                 task->tk_status = 0;
5485                 /* fall through */
5486         case -NFS4ERR_RETRY_UNCACHED_REP:
5487                 rpc_restart_call_prepare(task);
5488                 return;
5489         }
5490         dprintk("<-- %s\n", __func__);
5491 }
5492
5493 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
5494         .rpc_call_prepare = nfs4_get_lease_time_prepare,
5495         .rpc_call_done = nfs4_get_lease_time_done,
5496 };
5497
5498 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
5499 {
5500         struct rpc_task *task;
5501         struct nfs4_get_lease_time_args args;
5502         struct nfs4_get_lease_time_res res = {
5503                 .lr_fsinfo = fsinfo,
5504         };
5505         struct nfs4_get_lease_time_data data = {
5506                 .args = &args,
5507                 .res = &res,
5508                 .clp = clp,
5509         };
5510         struct rpc_message msg = {
5511                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
5512                 .rpc_argp = &args,
5513                 .rpc_resp = &res,
5514         };
5515         struct rpc_task_setup task_setup = {
5516                 .rpc_client = clp->cl_rpcclient,
5517                 .rpc_message = &msg,
5518                 .callback_ops = &nfs4_get_lease_time_ops,
5519                 .callback_data = &data,
5520                 .flags = RPC_TASK_TIMEOUT,
5521         };
5522         int status;
5523
5524         nfs41_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
5525         dprintk("--> %s\n", __func__);
5526         task = rpc_run_task(&task_setup);
5527
5528         if (IS_ERR(task))
5529                 status = PTR_ERR(task);
5530         else {
5531                 status = task->tk_status;
5532                 rpc_put_task(task);
5533         }
5534         dprintk("<-- %s return %d\n", __func__, status);
5535
5536         return status;
5537 }
5538
5539 /*
5540  * Initialize the values to be used by the client in CREATE_SESSION
5541  * If nfs4_init_session set the fore channel request and response sizes,
5542  * use them.
5543  *
5544  * Set the back channel max_resp_sz_cached to zero to force the client to
5545  * always set csa_cachethis to FALSE because the current implementation
5546  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
5547  */
5548 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
5549 {
5550         struct nfs4_session *session = args->client->cl_session;
5551         unsigned int mxrqst_sz = session->fc_target_max_rqst_sz,
5552                      mxresp_sz = session->fc_target_max_resp_sz;
5553
5554         if (mxrqst_sz == 0)
5555                 mxrqst_sz = NFS_MAX_FILE_IO_SIZE;
5556         if (mxresp_sz == 0)
5557                 mxresp_sz = NFS_MAX_FILE_IO_SIZE;
5558         /* Fore channel attributes */
5559         args->fc_attrs.max_rqst_sz = mxrqst_sz;
5560         args->fc_attrs.max_resp_sz = mxresp_sz;
5561         args->fc_attrs.max_ops = NFS4_MAX_OPS;
5562         args->fc_attrs.max_reqs = max_session_slots;
5563
5564         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
5565                 "max_ops=%u max_reqs=%u\n",
5566                 __func__,
5567                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
5568                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
5569
5570         /* Back channel attributes */
5571         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
5572         args->bc_attrs.max_resp_sz = PAGE_SIZE;
5573         args->bc_attrs.max_resp_sz_cached = 0;
5574         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
5575         args->bc_attrs.max_reqs = 1;
5576
5577         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
5578                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
5579                 __func__,
5580                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
5581                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
5582                 args->bc_attrs.max_reqs);
5583 }
5584
5585 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5586 {
5587         struct nfs4_channel_attrs *sent = &args->fc_attrs;
5588         struct nfs4_channel_attrs *rcvd = &session->fc_attrs;
5589
5590         if (rcvd->max_resp_sz > sent->max_resp_sz)
5591                 return -EINVAL;
5592         /*
5593          * Our requested max_ops is the minimum we need; we're not
5594          * prepared to break up compounds into smaller pieces than that.
5595          * So, no point even trying to continue if the server won't
5596          * cooperate:
5597          */
5598         if (rcvd->max_ops < sent->max_ops)
5599                 return -EINVAL;
5600         if (rcvd->max_reqs == 0)
5601                 return -EINVAL;
5602         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
5603                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
5604         return 0;
5605 }
5606
5607 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args, struct nfs4_session *session)
5608 {
5609         struct nfs4_channel_attrs *sent = &args->bc_attrs;
5610         struct nfs4_channel_attrs *rcvd = &session->bc_attrs;
5611
5612         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
5613                 return -EINVAL;
5614         if (rcvd->max_resp_sz < sent->max_resp_sz)
5615                 return -EINVAL;
5616         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
5617                 return -EINVAL;
5618         /* These would render the backchannel useless: */
5619         if (rcvd->max_ops != sent->max_ops)
5620                 return -EINVAL;
5621         if (rcvd->max_reqs != sent->max_reqs)
5622                 return -EINVAL;
5623         return 0;
5624 }
5625
5626 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
5627                                      struct nfs4_session *session)
5628 {
5629         int ret;
5630
5631         ret = nfs4_verify_fore_channel_attrs(args, session);
5632         if (ret)
5633                 return ret;
5634         return nfs4_verify_back_channel_attrs(args, session);
5635 }
5636
5637 static int _nfs4_proc_create_session(struct nfs_client *clp,
5638                 struct rpc_cred *cred)
5639 {
5640         struct nfs4_session *session = clp->cl_session;
5641         struct nfs41_create_session_args args = {
5642                 .client = clp,
5643                 .cb_program = NFS4_CALLBACK,
5644         };
5645         struct nfs41_create_session_res res = {
5646                 .client = clp,
5647         };
5648         struct rpc_message msg = {
5649                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
5650                 .rpc_argp = &args,
5651                 .rpc_resp = &res,
5652                 .rpc_cred = cred,
5653         };
5654         int status;
5655
5656         nfs4_init_channel_attrs(&args);
5657         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
5658
5659         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5660
5661         if (!status) {
5662                 /* Verify the session's negotiated channel_attrs values */
5663                 status = nfs4_verify_channel_attrs(&args, session);
5664                 /* Increment the clientid slot sequence id */
5665                 clp->cl_seqid++;
5666         }
5667
5668         return status;
5669 }
5670
5671 /*
5672  * Issues a CREATE_SESSION operation to the server.
5673  * It is the responsibility of the caller to verify the session is
5674  * expired before calling this routine.
5675  */
5676 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
5677 {
5678         int status;
5679         unsigned *ptr;
5680         struct nfs4_session *session = clp->cl_session;
5681
5682         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
5683
5684         status = _nfs4_proc_create_session(clp, cred);
5685         if (status)
5686                 goto out;
5687
5688         /* Init or reset the session slot tables */
5689         status = nfs4_setup_session_slot_tables(session);
5690         dprintk("slot table setup returned %d\n", status);
5691         if (status)
5692                 goto out;
5693
5694         ptr = (unsigned *)&session->sess_id.data[0];
5695         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
5696                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
5697 out:
5698         dprintk("<-- %s\n", __func__);
5699         return status;
5700 }
5701
5702 /*
5703  * Issue the over-the-wire RPC DESTROY_SESSION.
5704  * The caller must serialize access to this routine.
5705  */
5706 int nfs4_proc_destroy_session(struct nfs4_session *session,
5707                 struct rpc_cred *cred)
5708 {
5709         struct rpc_message msg = {
5710                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
5711                 .rpc_argp = session,
5712                 .rpc_cred = cred,
5713         };
5714         int status = 0;
5715
5716         dprintk("--> nfs4_proc_destroy_session\n");
5717
5718         /* session is still being setup */
5719         if (session->clp->cl_cons_state != NFS_CS_READY)
5720                 return status;
5721
5722         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5723
5724         if (status)
5725                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
5726                         "Session has been destroyed regardless...\n", status);
5727
5728         dprintk("<-- nfs4_proc_destroy_session\n");
5729         return status;
5730 }
5731
5732 /*
5733  * Renew the cl_session lease.
5734  */
5735 struct nfs4_sequence_data {
5736         struct nfs_client *clp;
5737         struct nfs4_sequence_args args;
5738         struct nfs4_sequence_res res;
5739 };
5740
5741 static void nfs41_sequence_release(void *data)
5742 {
5743         struct nfs4_sequence_data *calldata = data;
5744         struct nfs_client *clp = calldata->clp;
5745
5746         if (atomic_read(&clp->cl_count) > 1)
5747                 nfs4_schedule_state_renewal(clp);
5748         nfs_put_client(clp);
5749         kfree(calldata);
5750 }
5751
5752 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5753 {
5754         switch(task->tk_status) {
5755         case -NFS4ERR_DELAY:
5756                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5757                 return -EAGAIN;
5758         default:
5759                 nfs4_schedule_lease_recovery(clp);
5760         }
5761         return 0;
5762 }
5763
5764 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
5765 {
5766         struct nfs4_sequence_data *calldata = data;
5767         struct nfs_client *clp = calldata->clp;
5768
5769         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
5770                 return;
5771
5772         if (task->tk_status < 0) {
5773                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
5774                 if (atomic_read(&clp->cl_count) == 1)
5775                         goto out;
5776
5777                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
5778                         rpc_restart_call_prepare(task);
5779                         return;
5780                 }
5781         }
5782         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
5783 out:
5784         dprintk("<-- %s\n", __func__);
5785 }
5786
5787 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
5788 {
5789         struct nfs4_sequence_data *calldata = data;
5790         struct nfs_client *clp = calldata->clp;
5791         struct nfs4_sequence_args *args;
5792         struct nfs4_sequence_res *res;
5793
5794         args = task->tk_msg.rpc_argp;
5795         res = task->tk_msg.rpc_resp;
5796
5797         if (nfs41_setup_sequence(clp->cl_session, args, res, task))
5798                 return;
5799         rpc_call_start(task);
5800 }
5801
5802 static void nfs41_sequence_prepare_privileged(struct rpc_task *task, void *data)
5803 {
5804         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5805         nfs41_sequence_prepare(task, data);
5806 }
5807
5808 static const struct rpc_call_ops nfs41_sequence_ops = {
5809         .rpc_call_done = nfs41_sequence_call_done,
5810         .rpc_call_prepare = nfs41_sequence_prepare,
5811         .rpc_release = nfs41_sequence_release,
5812 };
5813
5814 static const struct rpc_call_ops nfs41_sequence_privileged_ops = {
5815         .rpc_call_done = nfs41_sequence_call_done,
5816         .rpc_call_prepare = nfs41_sequence_prepare_privileged,
5817         .rpc_release = nfs41_sequence_release,
5818 };
5819
5820 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred,
5821                                              const struct rpc_call_ops *seq_ops)
5822 {
5823         struct nfs4_sequence_data *calldata;
5824         struct rpc_message msg = {
5825                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
5826                 .rpc_cred = cred,
5827         };
5828         struct rpc_task_setup task_setup_data = {
5829                 .rpc_client = clp->cl_rpcclient,
5830                 .rpc_message = &msg,
5831                 .callback_ops = seq_ops,
5832                 .flags = RPC_TASK_ASYNC | RPC_TASK_SOFT,
5833         };
5834
5835         if (!atomic_inc_not_zero(&clp->cl_count))
5836                 return ERR_PTR(-EIO);
5837         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5838         if (calldata == NULL) {
5839                 nfs_put_client(clp);
5840                 return ERR_PTR(-ENOMEM);
5841         }
5842         nfs41_init_sequence(&calldata->args, &calldata->res, 0);
5843         msg.rpc_argp = &calldata->args;
5844         msg.rpc_resp = &calldata->res;
5845         calldata->clp = clp;
5846         task_setup_data.callback_data = calldata;
5847
5848         return rpc_run_task(&task_setup_data);
5849 }
5850
5851 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
5852 {
5853         struct rpc_task *task;
5854         int ret = 0;
5855
5856         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
5857                 return 0;
5858         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_ops);
5859         if (IS_ERR(task))
5860                 ret = PTR_ERR(task);
5861         else
5862                 rpc_put_task_async(task);
5863         dprintk("<-- %s status=%d\n", __func__, ret);
5864         return ret;
5865 }
5866
5867 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
5868 {
5869         struct rpc_task *task;
5870         int ret;
5871
5872         task = _nfs41_proc_sequence(clp, cred, &nfs41_sequence_privileged_ops);
5873         if (IS_ERR(task)) {
5874                 ret = PTR_ERR(task);
5875                 goto out;
5876         }
5877         ret = rpc_wait_for_completion_task(task);
5878         if (!ret) {
5879                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
5880
5881                 if (task->tk_status == 0)
5882                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
5883                 ret = task->tk_status;
5884         }
5885         rpc_put_task(task);
5886 out:
5887         dprintk("<-- %s status=%d\n", __func__, ret);
5888         return ret;
5889 }
5890
5891 struct nfs4_reclaim_complete_data {
5892         struct nfs_client *clp;
5893         struct nfs41_reclaim_complete_args arg;
5894         struct nfs41_reclaim_complete_res res;
5895 };
5896
5897 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
5898 {
5899         struct nfs4_reclaim_complete_data *calldata = data;
5900
5901         rpc_task_set_priority(task, RPC_PRIORITY_PRIVILEGED);
5902         if (nfs41_setup_sequence(calldata->clp->cl_session,
5903                                 &calldata->arg.seq_args,
5904                                 &calldata->res.seq_res, task))
5905                 return;
5906
5907         rpc_call_start(task);
5908 }
5909
5910 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
5911 {
5912         switch(task->tk_status) {
5913         case 0:
5914         case -NFS4ERR_COMPLETE_ALREADY:
5915         case -NFS4ERR_WRONG_CRED: /* What to do here? */
5916                 break;
5917         case -NFS4ERR_DELAY:
5918                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
5919                 /* fall through */
5920         case -NFS4ERR_RETRY_UNCACHED_REP:
5921                 return -EAGAIN;
5922         default:
5923                 nfs4_schedule_lease_recovery(clp);
5924         }
5925         return 0;
5926 }
5927
5928 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
5929 {
5930         struct nfs4_reclaim_complete_data *calldata = data;
5931         struct nfs_client *clp = calldata->clp;
5932         struct nfs4_sequence_res *res = &calldata->res.seq_res;
5933
5934         dprintk("--> %s\n", __func__);
5935         if (!nfs41_sequence_done(task, res))
5936                 return;
5937
5938         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
5939                 rpc_restart_call_prepare(task);
5940                 return;
5941         }
5942         dprintk("<-- %s\n", __func__);
5943 }
5944
5945 static void nfs4_free_reclaim_complete_data(void *data)
5946 {
5947         struct nfs4_reclaim_complete_data *calldata = data;
5948
5949         kfree(calldata);
5950 }
5951
5952 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
5953         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
5954         .rpc_call_done = nfs4_reclaim_complete_done,
5955         .rpc_release = nfs4_free_reclaim_complete_data,
5956 };
5957
5958 /*
5959  * Issue a global reclaim complete.
5960  */
5961 static int nfs41_proc_reclaim_complete(struct nfs_client *clp)
5962 {
5963         struct nfs4_reclaim_complete_data *calldata;
5964         struct rpc_task *task;
5965         struct rpc_message msg = {
5966                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
5967         };
5968         struct rpc_task_setup task_setup_data = {
5969                 .rpc_client = clp->cl_rpcclient,
5970                 .rpc_message = &msg,
5971                 .callback_ops = &nfs4_reclaim_complete_call_ops,
5972                 .flags = RPC_TASK_ASYNC,
5973         };
5974         int status = -ENOMEM;
5975
5976         dprintk("--> %s\n", __func__);
5977         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
5978         if (calldata == NULL)
5979                 goto out;
5980         calldata->clp = clp;
5981         calldata->arg.one_fs = 0;
5982
5983         nfs41_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
5984         msg.rpc_argp = &calldata->arg;
5985         msg.rpc_resp = &calldata->res;
5986         task_setup_data.callback_data = calldata;
5987         task = rpc_run_task(&task_setup_data);
5988         if (IS_ERR(task)) {
5989                 status = PTR_ERR(task);
5990                 goto out;
5991         }
5992         status = nfs4_wait_for_completion_rpc_task(task);
5993         if (status == 0)
5994                 status = task->tk_status;
5995         rpc_put_task(task);
5996         return 0;
5997 out:
5998         dprintk("<-- %s status=%d\n", __func__, status);
5999         return status;
6000 }
6001
6002 static void
6003 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
6004 {
6005         struct nfs4_layoutget *lgp = calldata;
6006         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6007
6008         dprintk("--> %s\n", __func__);
6009         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
6010          * right now covering the LAYOUTGET we are about to send.
6011          * However, that is not so catastrophic, and there seems
6012          * to be no way to prevent it completely.
6013          */
6014         if (nfs4_setup_sequence(server, &lgp->args.seq_args,
6015                                 &lgp->res.seq_res, task))
6016                 return;
6017         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
6018                                           NFS_I(lgp->args.inode)->layout,
6019                                           lgp->args.ctx->state)) {
6020                 rpc_exit(task, NFS4_OK);
6021                 return;
6022         }
6023         rpc_call_start(task);
6024 }
6025
6026 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
6027 {
6028         struct nfs4_layoutget *lgp = calldata;
6029         struct inode *inode = lgp->args.inode;
6030         struct nfs_server *server = NFS_SERVER(inode);
6031         struct pnfs_layout_hdr *lo;
6032         struct nfs4_state *state = NULL;
6033
6034         dprintk("--> %s\n", __func__);
6035
6036         if (!nfs4_sequence_done(task, &lgp->res.seq_res))
6037                 goto out;
6038
6039         switch (task->tk_status) {
6040         case 0:
6041                 goto out;
6042         case -NFS4ERR_LAYOUTTRYLATER:
6043         case -NFS4ERR_RECALLCONFLICT:
6044                 task->tk_status = -NFS4ERR_DELAY;
6045                 break;
6046         case -NFS4ERR_EXPIRED:
6047         case -NFS4ERR_BAD_STATEID:
6048                 spin_lock(&inode->i_lock);
6049                 lo = NFS_I(inode)->layout;
6050                 if (!lo || list_empty(&lo->plh_segs)) {
6051                         spin_unlock(&inode->i_lock);
6052                         /* If the open stateid was bad, then recover it. */
6053                         state = lgp->args.ctx->state;
6054                 } else {
6055                         LIST_HEAD(head);
6056
6057                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
6058                         spin_unlock(&inode->i_lock);
6059                         /* Mark the bad layout state as invalid, then
6060                          * retry using the open stateid. */
6061                         pnfs_free_lseg_list(&head);
6062                 }
6063         }
6064         if (nfs4_async_handle_error(task, server, state) == -EAGAIN)
6065                 rpc_restart_call_prepare(task);
6066 out:
6067         dprintk("<-- %s\n", __func__);
6068 }
6069
6070 static size_t max_response_pages(struct nfs_server *server)
6071 {
6072         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
6073         return nfs_page_array_len(0, max_resp_sz);
6074 }
6075
6076 static void nfs4_free_pages(struct page **pages, size_t size)
6077 {
6078         int i;
6079
6080         if (!pages)
6081                 return;
6082
6083         for (i = 0; i < size; i++) {
6084                 if (!pages[i])
6085                         break;
6086                 __free_page(pages[i]);
6087         }
6088         kfree(pages);
6089 }
6090
6091 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
6092 {
6093         struct page **pages;
6094         int i;
6095
6096         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
6097         if (!pages) {
6098                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
6099                 return NULL;
6100         }
6101
6102         for (i = 0; i < size; i++) {
6103                 pages[i] = alloc_page(gfp_flags);
6104                 if (!pages[i]) {
6105                         dprintk("%s: failed to allocate page\n", __func__);
6106                         nfs4_free_pages(pages, size);
6107                         return NULL;
6108                 }
6109         }
6110
6111         return pages;
6112 }
6113
6114 static void nfs4_layoutget_release(void *calldata)
6115 {
6116         struct nfs4_layoutget *lgp = calldata;
6117         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6118         size_t max_pages = max_response_pages(server);
6119
6120         dprintk("--> %s\n", __func__);
6121         nfs4_free_pages(lgp->args.layout.pages, max_pages);
6122         put_nfs_open_context(lgp->args.ctx);
6123         kfree(calldata);
6124         dprintk("<-- %s\n", __func__);
6125 }
6126
6127 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
6128         .rpc_call_prepare = nfs4_layoutget_prepare,
6129         .rpc_call_done = nfs4_layoutget_done,
6130         .rpc_release = nfs4_layoutget_release,
6131 };
6132
6133 struct pnfs_layout_segment *
6134 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
6135 {
6136         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
6137         size_t max_pages = max_response_pages(server);
6138         struct rpc_task *task;
6139         struct rpc_message msg = {
6140                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
6141                 .rpc_argp = &lgp->args,
6142                 .rpc_resp = &lgp->res,
6143         };
6144         struct rpc_task_setup task_setup_data = {
6145                 .rpc_client = server->client,
6146                 .rpc_message = &msg,
6147                 .callback_ops = &nfs4_layoutget_call_ops,
6148                 .callback_data = lgp,
6149                 .flags = RPC_TASK_ASYNC,
6150         };
6151         struct pnfs_layout_segment *lseg = NULL;
6152         int status = 0;
6153
6154         dprintk("--> %s\n", __func__);
6155
6156         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
6157         if (!lgp->args.layout.pages) {
6158                 nfs4_layoutget_release(lgp);
6159                 return ERR_PTR(-ENOMEM);
6160         }
6161         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
6162
6163         lgp->res.layoutp = &lgp->args.layout;
6164         lgp->res.seq_res.sr_slot = NULL;
6165         nfs41_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
6166         task = rpc_run_task(&task_setup_data);
6167         if (IS_ERR(task))
6168                 return ERR_CAST(task);
6169         status = nfs4_wait_for_completion_rpc_task(task);
6170         if (status == 0)
6171                 status = task->tk_status;
6172         if (status == 0)
6173                 lseg = pnfs_layout_process(lgp);
6174         rpc_put_task(task);
6175         dprintk("<-- %s status=%d\n", __func__, status);
6176         if (status)
6177                 return ERR_PTR(status);
6178         return lseg;
6179 }
6180
6181 static void
6182 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
6183 {
6184         struct nfs4_layoutreturn *lrp = calldata;
6185
6186         dprintk("--> %s\n", __func__);
6187         if (nfs41_setup_sequence(lrp->clp->cl_session, &lrp->args.seq_args,
6188                                 &lrp->res.seq_res, task))
6189                 return;
6190         rpc_call_start(task);
6191 }
6192
6193 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
6194 {
6195         struct nfs4_layoutreturn *lrp = calldata;
6196         struct nfs_server *server;
6197
6198         dprintk("--> %s\n", __func__);
6199
6200         if (!nfs4_sequence_done(task, &lrp->res.seq_res))
6201                 return;
6202
6203         server = NFS_SERVER(lrp->args.inode);
6204         if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6205                 rpc_restart_call_prepare(task);
6206                 return;
6207         }
6208         dprintk("<-- %s\n", __func__);
6209 }
6210
6211 static void nfs4_layoutreturn_release(void *calldata)
6212 {
6213         struct nfs4_layoutreturn *lrp = calldata;
6214         struct pnfs_layout_hdr *lo = lrp->args.layout;
6215
6216         dprintk("--> %s\n", __func__);
6217         spin_lock(&lo->plh_inode->i_lock);
6218         if (lrp->res.lrs_present)
6219                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
6220         lo->plh_block_lgets--;
6221         spin_unlock(&lo->plh_inode->i_lock);
6222         pnfs_put_layout_hdr(lrp->args.layout);
6223         kfree(calldata);
6224         dprintk("<-- %s\n", __func__);
6225 }
6226
6227 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
6228         .rpc_call_prepare = nfs4_layoutreturn_prepare,
6229         .rpc_call_done = nfs4_layoutreturn_done,
6230         .rpc_release = nfs4_layoutreturn_release,
6231 };
6232
6233 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp)
6234 {
6235         struct rpc_task *task;
6236         struct rpc_message msg = {
6237                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
6238                 .rpc_argp = &lrp->args,
6239                 .rpc_resp = &lrp->res,
6240         };
6241         struct rpc_task_setup task_setup_data = {
6242                 .rpc_client = lrp->clp->cl_rpcclient,
6243                 .rpc_message = &msg,
6244                 .callback_ops = &nfs4_layoutreturn_call_ops,
6245                 .callback_data = lrp,
6246         };
6247         int status;
6248
6249         dprintk("--> %s\n", __func__);
6250         nfs41_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
6251         task = rpc_run_task(&task_setup_data);
6252         if (IS_ERR(task))
6253                 return PTR_ERR(task);
6254         status = task->tk_status;
6255         dprintk("<-- %s status=%d\n", __func__, status);
6256         rpc_put_task(task);
6257         return status;
6258 }
6259
6260 /*
6261  * Retrieve the list of Data Server devices from the MDS.
6262  */
6263 static int _nfs4_getdevicelist(struct nfs_server *server,
6264                                     const struct nfs_fh *fh,
6265                                     struct pnfs_devicelist *devlist)
6266 {
6267         struct nfs4_getdevicelist_args args = {
6268                 .fh = fh,
6269                 .layoutclass = server->pnfs_curr_ld->id,
6270         };
6271         struct nfs4_getdevicelist_res res = {
6272                 .devlist = devlist,
6273         };
6274         struct rpc_message msg = {
6275                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICELIST],
6276                 .rpc_argp = &args,
6277                 .rpc_resp = &res,
6278         };
6279         int status;
6280
6281         dprintk("--> %s\n", __func__);
6282         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
6283                                 &res.seq_res, 0);
6284         dprintk("<-- %s status=%d\n", __func__, status);
6285         return status;
6286 }
6287
6288 int nfs4_proc_getdevicelist(struct nfs_server *server,
6289                             const struct nfs_fh *fh,
6290                             struct pnfs_devicelist *devlist)
6291 {
6292         struct nfs4_exception exception = { };
6293         int err;
6294
6295         do {
6296                 err = nfs4_handle_exception(server,
6297                                 _nfs4_getdevicelist(server, fh, devlist),
6298                                 &exception);
6299         } while (exception.retry);
6300
6301         dprintk("%s: err=%d, num_devs=%u\n", __func__,
6302                 err, devlist->num_devs);
6303
6304         return err;
6305 }
6306 EXPORT_SYMBOL_GPL(nfs4_proc_getdevicelist);
6307
6308 static int
6309 _nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6310 {
6311         struct nfs4_getdeviceinfo_args args = {
6312                 .pdev = pdev,
6313         };
6314         struct nfs4_getdeviceinfo_res res = {
6315                 .pdev = pdev,
6316         };
6317         struct rpc_message msg = {
6318                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
6319                 .rpc_argp = &args,
6320                 .rpc_resp = &res,
6321         };
6322         int status;
6323
6324         dprintk("--> %s\n", __func__);
6325         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6326         dprintk("<-- %s status=%d\n", __func__, status);
6327
6328         return status;
6329 }
6330
6331 int nfs4_proc_getdeviceinfo(struct nfs_server *server, struct pnfs_device *pdev)
6332 {
6333         struct nfs4_exception exception = { };
6334         int err;
6335
6336         do {
6337                 err = nfs4_handle_exception(server,
6338                                         _nfs4_proc_getdeviceinfo(server, pdev),
6339                                         &exception);
6340         } while (exception.retry);
6341         return err;
6342 }
6343 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
6344
6345 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
6346 {
6347         struct nfs4_layoutcommit_data *data = calldata;
6348         struct nfs_server *server = NFS_SERVER(data->args.inode);
6349
6350         if (nfs4_setup_sequence(server, &data->args.seq_args,
6351                                 &data->res.seq_res, task))
6352                 return;
6353         rpc_call_start(task);
6354 }
6355
6356 static void
6357 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
6358 {
6359         struct nfs4_layoutcommit_data *data = calldata;
6360         struct nfs_server *server = NFS_SERVER(data->args.inode);
6361
6362         if (!nfs4_sequence_done(task, &data->res.seq_res))
6363                 return;
6364
6365         switch (task->tk_status) { /* Just ignore these failures */
6366         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
6367         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
6368         case -NFS4ERR_BADLAYOUT:     /* no layout */
6369         case -NFS4ERR_GRACE:        /* loca_recalim always false */
6370                 task->tk_status = 0;
6371                 break;
6372         case 0:
6373                 nfs_post_op_update_inode_force_wcc(data->args.inode,
6374                                                    data->res.fattr);
6375                 break;
6376         default:
6377                 if (nfs4_async_handle_error(task, server, NULL) == -EAGAIN) {
6378                         rpc_restart_call_prepare(task);
6379                         return;
6380                 }
6381         }
6382 }
6383
6384 static void nfs4_layoutcommit_release(void *calldata)
6385 {
6386         struct nfs4_layoutcommit_data *data = calldata;
6387         struct pnfs_layout_segment *lseg, *tmp;
6388         unsigned long *bitlock = &NFS_I(data->args.inode)->flags;
6389
6390         pnfs_cleanup_layoutcommit(data);
6391         /* Matched by references in pnfs_set_layoutcommit */
6392         list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
6393                 list_del_init(&lseg->pls_lc_list);
6394                 if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
6395                                        &lseg->pls_flags))
6396                         pnfs_put_lseg(lseg);
6397         }
6398
6399         clear_bit_unlock(NFS_INO_LAYOUTCOMMITTING, bitlock);
6400         smp_mb__after_clear_bit();
6401         wake_up_bit(bitlock, NFS_INO_LAYOUTCOMMITTING);
6402
6403         put_rpccred(data->cred);
6404         kfree(data);
6405 }
6406
6407 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
6408         .rpc_call_prepare = nfs4_layoutcommit_prepare,
6409         .rpc_call_done = nfs4_layoutcommit_done,
6410         .rpc_release = nfs4_layoutcommit_release,
6411 };
6412
6413 int
6414 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
6415 {
6416         struct rpc_message msg = {
6417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
6418                 .rpc_argp = &data->args,
6419                 .rpc_resp = &data->res,
6420                 .rpc_cred = data->cred,
6421         };
6422         struct rpc_task_setup task_setup_data = {
6423                 .task = &data->task,
6424                 .rpc_client = NFS_CLIENT(data->args.inode),
6425                 .rpc_message = &msg,
6426                 .callback_ops = &nfs4_layoutcommit_ops,
6427                 .callback_data = data,
6428                 .flags = RPC_TASK_ASYNC,
6429         };
6430         struct rpc_task *task;
6431         int status = 0;
6432
6433         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
6434                 "lbw: %llu inode %lu\n",
6435                 data->task.tk_pid, sync,
6436                 data->args.lastbytewritten,
6437                 data->args.inode->i_ino);
6438
6439         nfs41_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
6440         task = rpc_run_task(&task_setup_data);
6441         if (IS_ERR(task))
6442                 return PTR_ERR(task);
6443         if (sync == false)
6444                 goto out;
6445         status = nfs4_wait_for_completion_rpc_task(task);
6446         if (status != 0)
6447                 goto out;
6448         status = task->tk_status;
6449 out:
6450         dprintk("%s: status %d\n", __func__, status);
6451         rpc_put_task(task);
6452         return status;
6453 }
6454
6455 static int
6456 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6457                     struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6458 {
6459         struct nfs41_secinfo_no_name_args args = {
6460                 .style = SECINFO_STYLE_CURRENT_FH,
6461         };
6462         struct nfs4_secinfo_res res = {
6463                 .flavors = flavors,
6464         };
6465         struct rpc_message msg = {
6466                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
6467                 .rpc_argp = &args,
6468                 .rpc_resp = &res,
6469         };
6470         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
6471 }
6472
6473 static int
6474 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
6475                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
6476 {
6477         struct nfs4_exception exception = { };
6478         int err;
6479         do {
6480                 err = _nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6481                 switch (err) {
6482                 case 0:
6483                 case -NFS4ERR_WRONGSEC:
6484                 case -NFS4ERR_NOTSUPP:
6485                         goto out;
6486                 default:
6487                         err = nfs4_handle_exception(server, err, &exception);
6488                 }
6489         } while (exception.retry);
6490 out:
6491         return err;
6492 }
6493
6494 static int
6495 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
6496                     struct nfs_fsinfo *info)
6497 {
6498         int err;
6499         struct page *page;
6500         rpc_authflavor_t flavor;
6501         struct nfs4_secinfo_flavors *flavors;
6502
6503         page = alloc_page(GFP_KERNEL);
6504         if (!page) {
6505                 err = -ENOMEM;
6506                 goto out;
6507         }
6508
6509         flavors = page_address(page);
6510         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
6511
6512         /*
6513          * Fall back on "guess and check" method if
6514          * the server doesn't support SECINFO_NO_NAME
6515          */
6516         if (err == -NFS4ERR_WRONGSEC || err == -NFS4ERR_NOTSUPP) {
6517                 err = nfs4_find_root_sec(server, fhandle, info);
6518                 goto out_freepage;
6519         }
6520         if (err)
6521                 goto out_freepage;
6522
6523         flavor = nfs_find_best_sec(flavors);
6524         if (err == 0)
6525                 err = nfs4_lookup_root_sec(server, fhandle, info, flavor);
6526
6527 out_freepage:
6528         put_page(page);
6529         if (err == -EACCES)
6530                 return -EPERM;
6531 out:
6532         return err;
6533 }
6534
6535 static int _nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6536 {
6537         int status;
6538         struct nfs41_test_stateid_args args = {
6539                 .stateid = stateid,
6540         };
6541         struct nfs41_test_stateid_res res;
6542         struct rpc_message msg = {
6543                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
6544                 .rpc_argp = &args,
6545                 .rpc_resp = &res,
6546         };
6547
6548         dprintk("NFS call  test_stateid %p\n", stateid);
6549         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6550         status = nfs4_call_sync_sequence(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
6551         if (status != NFS_OK) {
6552                 dprintk("NFS reply test_stateid: failed, %d\n", status);
6553                 return status;
6554         }
6555         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
6556         return -res.status;
6557 }
6558
6559 /**
6560  * nfs41_test_stateid - perform a TEST_STATEID operation
6561  *
6562  * @server: server / transport on which to perform the operation
6563  * @stateid: state ID to test
6564  *
6565  * Returns NFS_OK if the server recognizes that "stateid" is valid.
6566  * Otherwise a negative NFS4ERR value is returned if the operation
6567  * failed or the state ID is not currently valid.
6568  */
6569 static int nfs41_test_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6570 {
6571         struct nfs4_exception exception = { };
6572         int err;
6573         do {
6574                 err = _nfs41_test_stateid(server, stateid);
6575                 if (err != -NFS4ERR_DELAY)
6576                         break;
6577                 nfs4_handle_exception(server, err, &exception);
6578         } while (exception.retry);
6579         return err;
6580 }
6581
6582 static int _nfs4_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6583 {
6584         struct nfs41_free_stateid_args args = {
6585                 .stateid = stateid,
6586         };
6587         struct nfs41_free_stateid_res res;
6588         struct rpc_message msg = {
6589                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
6590                 .rpc_argp = &args,
6591                 .rpc_resp = &res,
6592         };
6593         int status;
6594
6595         dprintk("NFS call  free_stateid %p\n", stateid);
6596         nfs41_init_sequence(&args.seq_args, &res.seq_res, 0);
6597         status = nfs4_call_sync_sequence(server->client, server, &msg,
6598                                          &args.seq_args, &res.seq_res, 1);
6599         dprintk("NFS reply free_stateid: %d\n", status);
6600         return status;
6601 }
6602
6603 /**
6604  * nfs41_free_stateid - perform a FREE_STATEID operation
6605  *
6606  * @server: server / transport on which to perform the operation
6607  * @stateid: state ID to release
6608  *
6609  * Returns NFS_OK if the server freed "stateid".  Otherwise a
6610  * negative NFS4ERR value is returned.
6611  */
6612 static int nfs41_free_stateid(struct nfs_server *server, nfs4_stateid *stateid)
6613 {
6614         struct nfs4_exception exception = { };
6615         int err;
6616         do {
6617                 err = _nfs4_free_stateid(server, stateid);
6618                 if (err != -NFS4ERR_DELAY)
6619                         break;
6620                 nfs4_handle_exception(server, err, &exception);
6621         } while (exception.retry);
6622         return err;
6623 }
6624
6625 static bool nfs41_match_stateid(const nfs4_stateid *s1,
6626                 const nfs4_stateid *s2)
6627 {
6628         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
6629                 return false;
6630
6631         if (s1->seqid == s2->seqid)
6632                 return true;
6633         if (s1->seqid == 0 || s2->seqid == 0)
6634                 return true;
6635
6636         return false;
6637 }
6638
6639 #endif /* CONFIG_NFS_V4_1 */
6640
6641 static bool nfs4_match_stateid(const nfs4_stateid *s1,
6642                 const nfs4_stateid *s2)
6643 {
6644         return nfs4_stateid_match(s1, s2);
6645 }
6646
6647
6648 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
6649         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6650         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6651         .recover_open   = nfs4_open_reclaim,
6652         .recover_lock   = nfs4_lock_reclaim,
6653         .establish_clid = nfs4_init_clientid,
6654         .get_clid_cred  = nfs4_get_setclientid_cred,
6655         .detect_trunking = nfs40_discover_server_trunking,
6656 };
6657
6658 #if defined(CONFIG_NFS_V4_1)
6659 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
6660         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
6661         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
6662         .recover_open   = nfs4_open_reclaim,
6663         .recover_lock   = nfs4_lock_reclaim,
6664         .establish_clid = nfs41_init_clientid,
6665         .get_clid_cred  = nfs4_get_exchange_id_cred,
6666         .reclaim_complete = nfs41_proc_reclaim_complete,
6667         .detect_trunking = nfs41_discover_server_trunking,
6668 };
6669 #endif /* CONFIG_NFS_V4_1 */
6670
6671 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
6672         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6673         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6674         .recover_open   = nfs4_open_expired,
6675         .recover_lock   = nfs4_lock_expired,
6676         .establish_clid = nfs4_init_clientid,
6677         .get_clid_cred  = nfs4_get_setclientid_cred,
6678 };
6679
6680 #if defined(CONFIG_NFS_V4_1)
6681 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
6682         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
6683         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
6684         .recover_open   = nfs41_open_expired,
6685         .recover_lock   = nfs41_lock_expired,
6686         .establish_clid = nfs41_init_clientid,
6687         .get_clid_cred  = nfs4_get_exchange_id_cred,
6688 };
6689 #endif /* CONFIG_NFS_V4_1 */
6690
6691 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
6692         .sched_state_renewal = nfs4_proc_async_renew,
6693         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
6694         .renew_lease = nfs4_proc_renew,
6695 };
6696
6697 #if defined(CONFIG_NFS_V4_1)
6698 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
6699         .sched_state_renewal = nfs41_proc_async_sequence,
6700         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
6701         .renew_lease = nfs4_proc_sequence,
6702 };
6703 #endif
6704
6705 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
6706         .minor_version = 0,
6707         .call_sync = _nfs4_call_sync,
6708         .match_stateid = nfs4_match_stateid,
6709         .find_root_sec = nfs4_find_root_sec,
6710         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
6711         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
6712         .state_renewal_ops = &nfs40_state_renewal_ops,
6713 };
6714
6715 #if defined(CONFIG_NFS_V4_1)
6716 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
6717         .minor_version = 1,
6718         .call_sync = _nfs4_call_sync_session,
6719         .match_stateid = nfs41_match_stateid,
6720         .find_root_sec = nfs41_find_root_sec,
6721         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
6722         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
6723         .state_renewal_ops = &nfs41_state_renewal_ops,
6724 };
6725 #endif
6726
6727 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
6728         [0] = &nfs_v4_0_minor_ops,
6729 #if defined(CONFIG_NFS_V4_1)
6730         [1] = &nfs_v4_1_minor_ops,
6731 #endif
6732 };
6733
6734 const struct inode_operations nfs4_dir_inode_operations = {
6735         .create         = nfs_create,
6736         .lookup         = nfs_lookup,
6737         .atomic_open    = nfs_atomic_open,
6738         .link           = nfs_link,
6739         .unlink         = nfs_unlink,
6740         .symlink        = nfs_symlink,
6741         .mkdir          = nfs_mkdir,
6742         .rmdir          = nfs_rmdir,
6743         .mknod          = nfs_mknod,
6744         .rename         = nfs_rename,
6745         .permission     = nfs_permission,
6746         .getattr        = nfs_getattr,
6747         .setattr        = nfs_setattr,
6748         .getxattr       = generic_getxattr,
6749         .setxattr       = generic_setxattr,
6750         .listxattr      = generic_listxattr,
6751         .removexattr    = generic_removexattr,
6752 };
6753
6754 static const struct inode_operations nfs4_file_inode_operations = {
6755         .permission     = nfs_permission,
6756         .getattr        = nfs_getattr,
6757         .setattr        = nfs_setattr,
6758         .getxattr       = generic_getxattr,
6759         .setxattr       = generic_setxattr,
6760         .listxattr      = generic_listxattr,
6761         .removexattr    = generic_removexattr,
6762 };
6763
6764 const struct nfs_rpc_ops nfs_v4_clientops = {
6765         .version        = 4,                    /* protocol version */
6766         .dentry_ops     = &nfs4_dentry_operations,
6767         .dir_inode_ops  = &nfs4_dir_inode_operations,
6768         .file_inode_ops = &nfs4_file_inode_operations,
6769         .file_ops       = &nfs4_file_operations,
6770         .getroot        = nfs4_proc_get_root,
6771         .submount       = nfs4_submount,
6772         .try_mount      = nfs4_try_mount,
6773         .getattr        = nfs4_proc_getattr,
6774         .setattr        = nfs4_proc_setattr,
6775         .lookup         = nfs4_proc_lookup,
6776         .access         = nfs4_proc_access,
6777         .readlink       = nfs4_proc_readlink,
6778         .create         = nfs4_proc_create,
6779         .remove         = nfs4_proc_remove,
6780         .unlink_setup   = nfs4_proc_unlink_setup,
6781         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
6782         .unlink_done    = nfs4_proc_unlink_done,
6783         .rename         = nfs4_proc_rename,
6784         .rename_setup   = nfs4_proc_rename_setup,
6785         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
6786         .rename_done    = nfs4_proc_rename_done,
6787         .link           = nfs4_proc_link,
6788         .symlink        = nfs4_proc_symlink,
6789         .mkdir          = nfs4_proc_mkdir,
6790         .rmdir          = nfs4_proc_remove,
6791         .readdir        = nfs4_proc_readdir,
6792         .mknod          = nfs4_proc_mknod,
6793         .statfs         = nfs4_proc_statfs,
6794         .fsinfo         = nfs4_proc_fsinfo,
6795         .pathconf       = nfs4_proc_pathconf,
6796         .set_capabilities = nfs4_server_capabilities,
6797         .decode_dirent  = nfs4_decode_dirent,
6798         .read_setup     = nfs4_proc_read_setup,
6799         .read_pageio_init = pnfs_pageio_init_read,
6800         .read_rpc_prepare = nfs4_proc_read_rpc_prepare,
6801         .read_done      = nfs4_read_done,
6802         .write_setup    = nfs4_proc_write_setup,
6803         .write_pageio_init = pnfs_pageio_init_write,
6804         .write_rpc_prepare = nfs4_proc_write_rpc_prepare,
6805         .write_done     = nfs4_write_done,
6806         .commit_setup   = nfs4_proc_commit_setup,
6807         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
6808         .commit_done    = nfs4_commit_done,
6809         .lock           = nfs4_proc_lock,
6810         .clear_acl_cache = nfs4_zap_acl_attr,
6811         .close_context  = nfs4_close_context,
6812         .open_context   = nfs4_atomic_open,
6813         .have_delegation = nfs4_have_delegation,
6814         .return_delegation = nfs4_inode_return_delegation,
6815         .alloc_client   = nfs4_alloc_client,
6816         .init_client    = nfs4_init_client,
6817         .free_client    = nfs4_free_client,
6818         .create_server  = nfs4_create_server,
6819         .clone_server   = nfs_clone_server,
6820 };
6821
6822 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
6823         .prefix = XATTR_NAME_NFSV4_ACL,
6824         .list   = nfs4_xattr_list_nfs4_acl,
6825         .get    = nfs4_xattr_get_nfs4_acl,
6826         .set    = nfs4_xattr_set_nfs4_acl,
6827 };
6828
6829 const struct xattr_handler *nfs4_xattr_handlers[] = {
6830         &nfs4_xattr_nfs4_acl_handler,
6831         NULL
6832 };
6833
6834 /*
6835  * Local variables:
6836  *  c-basic-offset: 8
6837  * End:
6838  */