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/xattr.h>
  55 #include <linux/utsname.h>
  56 #include <linux/freezer.h>
  57
  58 #include "nfs4_fs.h"
  59 #include "delegation.h"
  60 #include "internal.h"
  61 #include "iostat.h"
  62 #include "callback.h"
  63 #include "pnfs.h"
  64 #include "netns.h"
  65 #include "nfs4idmap.h"
  66 #include "nfs4session.h"
  67 #include "fscache.h"
  68
  69 #include "nfs4trace.h"
  70
  71 #define NFSDBG_FACILITY         NFSDBG_PROC
  72
  73 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  74 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  75
  76 struct nfs4_opendata;
  77 static int _nfs4_proc_open(struct nfs4_opendata *data);
  78 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  79 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  80 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *, long *);
  81 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  82 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state, struct nfs4_label *ilabel,
  87                             struct nfs4_label *olabel);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  90                 struct rpc_cred *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  92                 struct rpc_cred *);
  93 #endif
  94
  95 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  96 static inline struct nfs4_label *
  97 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  98         struct iattr *sattr, struct nfs4_label *label)
  99 {
 100         int err;
 101
 102         if (label == NULL)
 103                 return NULL;
 104
 105         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 106                 return NULL;
 107
 108         err = security_dentry_init_security(dentry, sattr->ia_mode,
 109                                 &dentry->d_name, (void **)&label->label, &label->len);
 110         if (err == 0)
 111                 return label;
 112
 113         return NULL;
 114 }
 115 static inline void
 116 nfs4_label_release_security(struct nfs4_label *label)
 117 {
 118         if (label)
 119                 security_release_secctx(label->label, label->len);
 120 }
 121 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 122 {
 123         if (label)
 124                 return server->attr_bitmask;
 125
 126         return server->attr_bitmask_nl;
 127 }
 128 #else
 129 static inline struct nfs4_label *
 130 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 131         struct iattr *sattr, struct nfs4_label *l)
 132 { return NULL; }
 133 static inline void
 134 nfs4_label_release_security(struct nfs4_label *label)
 135 { return; }
 136 static inline u32 *
 137 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 138 { return server->attr_bitmask; }
 139 #endif
 140
 141 /* Prevent leaks of NFSv4 errors into userland */
 142 static int nfs4_map_errors(int err)
 143 {
 144         if (err >= -1000)
 145                 return err;
 146         switch (err) {
 147         case -NFS4ERR_RESOURCE:
 148         case -NFS4ERR_LAYOUTTRYLATER:
 149         case -NFS4ERR_RECALLCONFLICT:
 150                 return -EREMOTEIO;
 151         case -NFS4ERR_WRONGSEC:
 152         case -NFS4ERR_WRONG_CRED:
 153                 return -EPERM;
 154         case -NFS4ERR_BADOWNER:
 155         case -NFS4ERR_BADNAME:
 156                 return -EINVAL;
 157         case -NFS4ERR_SHARE_DENIED:
 158                 return -EACCES;
 159         case -NFS4ERR_MINOR_VERS_MISMATCH:
 160                 return -EPROTONOSUPPORT;
 161         case -NFS4ERR_FILE_OPEN:
 162                 return -EBUSY;
 163         default:
 164                 dprintk("%s could not handle NFSv4 error %d\n",
 165                                 __func__, -err);
 166                 break;
 167         }
 168         return -EIO;
 169 }
 170
 171 /*
 172  * This is our standard bitmap for GETATTR requests.
 173  */
 174 const u32 nfs4_fattr_bitmap[3] = {
 175         FATTR4_WORD0_TYPE
 176         | FATTR4_WORD0_CHANGE
 177         | FATTR4_WORD0_SIZE
 178         | FATTR4_WORD0_FSID
 179         | FATTR4_WORD0_FILEID,
 180         FATTR4_WORD1_MODE
 181         | FATTR4_WORD1_NUMLINKS
 182         | FATTR4_WORD1_OWNER
 183         | FATTR4_WORD1_OWNER_GROUP
 184         | FATTR4_WORD1_RAWDEV
 185         | FATTR4_WORD1_SPACE_USED
 186         | FATTR4_WORD1_TIME_ACCESS
 187         | FATTR4_WORD1_TIME_METADATA
 188         | FATTR4_WORD1_TIME_MODIFY
 189         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 190 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 191         FATTR4_WORD2_SECURITY_LABEL
 192 #endif
 193 };
 194
 195 static const u32 nfs4_pnfs_open_bitmap[3] = {
 196         FATTR4_WORD0_TYPE
 197         | FATTR4_WORD0_CHANGE
 198         | FATTR4_WORD0_SIZE
 199         | FATTR4_WORD0_FSID
 200         | FATTR4_WORD0_FILEID,
 201         FATTR4_WORD1_MODE
 202         | FATTR4_WORD1_NUMLINKS
 203         | FATTR4_WORD1_OWNER
 204         | FATTR4_WORD1_OWNER_GROUP
 205         | FATTR4_WORD1_RAWDEV
 206         | FATTR4_WORD1_SPACE_USED
 207         | FATTR4_WORD1_TIME_ACCESS
 208         | FATTR4_WORD1_TIME_METADATA
 209         | FATTR4_WORD1_TIME_MODIFY,
 210         FATTR4_WORD2_MDSTHRESHOLD
 211 };
 212
 213 static const u32 nfs4_open_noattr_bitmap[3] = {
 214         FATTR4_WORD0_TYPE
 215         | FATTR4_WORD0_CHANGE
 216         | FATTR4_WORD0_FILEID,
 217 };
 218
 219 const u32 nfs4_statfs_bitmap[3] = {
 220         FATTR4_WORD0_FILES_AVAIL
 221         | FATTR4_WORD0_FILES_FREE
 222         | FATTR4_WORD0_FILES_TOTAL,
 223         FATTR4_WORD1_SPACE_AVAIL
 224         | FATTR4_WORD1_SPACE_FREE
 225         | FATTR4_WORD1_SPACE_TOTAL
 226 };
 227
 228 const u32 nfs4_pathconf_bitmap[3] = {
 229         FATTR4_WORD0_MAXLINK
 230         | FATTR4_WORD0_MAXNAME,
 231         0
 232 };
 233
 234 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 235                         | FATTR4_WORD0_MAXREAD
 236                         | FATTR4_WORD0_MAXWRITE
 237                         | FATTR4_WORD0_LEASE_TIME,
 238                         FATTR4_WORD1_TIME_DELTA
 239                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 240                         FATTR4_WORD2_LAYOUT_BLKSIZE
 241 };
 242
 243 const u32 nfs4_fs_locations_bitmap[3] = {
 244         FATTR4_WORD0_TYPE
 245         | FATTR4_WORD0_CHANGE
 246         | FATTR4_WORD0_SIZE
 247         | FATTR4_WORD0_FSID
 248         | FATTR4_WORD0_FILEID
 249         | FATTR4_WORD0_FS_LOCATIONS,
 250         FATTR4_WORD1_MODE
 251         | FATTR4_WORD1_NUMLINKS
 252         | FATTR4_WORD1_OWNER
 253         | FATTR4_WORD1_OWNER_GROUP
 254         | FATTR4_WORD1_RAWDEV
 255         | FATTR4_WORD1_SPACE_USED
 256         | FATTR4_WORD1_TIME_ACCESS
 257         | FATTR4_WORD1_TIME_METADATA
 258         | FATTR4_WORD1_TIME_MODIFY
 259         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 260 };
 261
 262 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 263                 struct nfs4_readdir_arg *readdir)
 264 {
 265         __be32 *start, *p;
 266
 267         if (cookie > 2) {
 268                 readdir->cookie = cookie;
 269                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 270                 return;
 271         }
 272
 273         readdir->cookie = 0;
 274         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 275         if (cookie == 2)
 276                 return;
 277
 278         /*
 279          * NFSv4 servers do not return entries for '.' and '..'
 280          * Therefore, we fake these entries here.  We let '.'
 281          * have cookie 0 and '..' have cookie 1.  Note that
 282          * when talking to the server, we always send cookie 0
 283          * instead of 1 or 2.
 284          */
 285         start = p = kmap_atomic(*readdir->pages);
 286
 287         if (cookie == 0) {
 288                 *p++ = xdr_one;                                  /* next */
 289                 *p++ = xdr_zero;                   /* cookie, first word */
 290                 *p++ = xdr_one;                   /* cookie, second word */
 291                 *p++ = xdr_one;                             /* entry len */
 292                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 293                 p++;
 294                 *p++ = xdr_one;                         /* bitmap length */
 295                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 296                 *p++ = htonl(8);              /* attribute buffer length */
 297                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 298         }
 299
 300         *p++ = xdr_one;                                  /* next */
 301         *p++ = xdr_zero;                   /* cookie, first word */
 302         *p++ = xdr_two;                   /* cookie, second word */
 303         *p++ = xdr_two;                             /* entry len */
 304         memcpy(p, "..\0\0", 4);                         /* entry */
 305         p++;
 306         *p++ = xdr_one;                         /* bitmap length */
 307         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 308         *p++ = htonl(8);              /* attribute buffer length */
 309         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 310
 311         readdir->pgbase = (char *)p - (char *)start;
 312         readdir->count -= readdir->pgbase;
 313         kunmap_atomic(start);
 314 }
 315
 316 static long nfs4_update_delay(long *timeout)
 317 {
 318         long ret;
 319         if (!timeout)
 320                 return NFS4_POLL_RETRY_MAX;
 321         if (*timeout <= 0)
 322                 *timeout = NFS4_POLL_RETRY_MIN;
 323         if (*timeout > NFS4_POLL_RETRY_MAX)
 324                 *timeout = NFS4_POLL_RETRY_MAX;
 325         ret = *timeout;
 326         *timeout <<= 1;
 327         return ret;
 328 }
 329
 330 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 331 {
 332         int res = 0;
 333
 334         might_sleep();
 335
 336         freezable_schedule_timeout_killable_unsafe(
 337                 nfs4_update_delay(timeout));
 338         if (fatal_signal_pending(current))
 339                 res = -ERESTARTSYS;
 340         return res;
 341 }
 342
 343 /* This is the error handling routine for processes that are allowed
 344  * to sleep.
 345  */
 346 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 347 {
 348         struct nfs_client *clp = server->nfs_client;
 349         struct nfs4_state *state = exception->state;
 350         struct inode *inode = exception->inode;
 351         int ret = errorcode;
 352
 353         exception->retry = 0;
 354         switch(errorcode) {
 355                 case 0:
 356                         return 0;
 357                 case -NFS4ERR_OPENMODE:
 358                         if (inode && nfs4_have_delegation(inode, FMODE_READ)) {
 359                                 nfs4_inode_return_delegation(inode);
 360                                 exception->retry = 1;
 361                                 return 0;
 362                         }
 363                         if (state == NULL)
 364                                 break;
 365                         ret = nfs4_schedule_stateid_recovery(server, state);
 366                         if (ret < 0)
 367                                 break;
 368                         goto wait_on_recovery;
 369                 case -NFS4ERR_DELEG_REVOKED:
 370                 case -NFS4ERR_ADMIN_REVOKED:
 371                 case -NFS4ERR_BAD_STATEID:
 372                         if (state == NULL)
 373                                 break;
 374                         ret = nfs4_schedule_stateid_recovery(server, state);
 375                         if (ret < 0)
 376                                 break;
 377                         goto wait_on_recovery;
 378                 case -NFS4ERR_EXPIRED:
 379                         if (state != NULL) {
 380                                 ret = nfs4_schedule_stateid_recovery(server, state);
 381                                 if (ret < 0)
 382                                         break;
 383                         }
 384                 case -NFS4ERR_STALE_STATEID:
 385                 case -NFS4ERR_STALE_CLIENTID:
 386                         nfs4_schedule_lease_recovery(clp);
 387                         goto wait_on_recovery;
 388                 case -NFS4ERR_MOVED:
 389                         ret = nfs4_schedule_migration_recovery(server);
 390                         if (ret < 0)
 391                                 break;
 392                         goto wait_on_recovery;
 393                 case -NFS4ERR_LEASE_MOVED:
 394                         nfs4_schedule_lease_moved_recovery(clp);
 395                         goto wait_on_recovery;
 396 #if defined(CONFIG_NFS_V4_1)
 397                 case -NFS4ERR_BADSESSION:
 398                 case -NFS4ERR_BADSLOT:
 399                 case -NFS4ERR_BAD_HIGH_SLOT:
 400                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 401                 case -NFS4ERR_DEADSESSION:
 402                 case -NFS4ERR_SEQ_FALSE_RETRY:
 403                 case -NFS4ERR_SEQ_MISORDERED:
 404                         dprintk("%s ERROR: %d Reset session\n", __func__,
 405                                 errorcode);
 406                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 407                         goto wait_on_recovery;
 408 #endif /* defined(CONFIG_NFS_V4_1) */
 409                 case -NFS4ERR_FILE_OPEN:
 410                         if (exception->timeout > HZ) {
 411                                 /* We have retried a decent amount, time to
 412                                  * fail
 413                                  */
 414                                 ret = -EBUSY;
 415                                 break;
 416                         }
 417                 case -NFS4ERR_GRACE:
 418                 case -NFS4ERR_DELAY:
 419                         ret = nfs4_delay(server->client, &exception->timeout);
 420                         if (ret != 0)
 421                                 break;
 422                 case -NFS4ERR_RETRY_UNCACHED_REP:
 423                 case -NFS4ERR_OLD_STATEID:
 424                         exception->retry = 1;
 425                         break;
 426                 case -NFS4ERR_BADOWNER:
 427                         /* The following works around a Linux server bug! */
 428                 case -NFS4ERR_BADNAME:
 429                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 430                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 431                                 exception->retry = 1;
 432                                 printk(KERN_WARNING "NFS: v4 server %s "
 433                                                 "does not accept raw "
 434                                                 "uid/gids. "
 435                                                 "Reenabling the idmapper.\n",
 436                                                 server->nfs_client->cl_hostname);
 437                         }
 438         }
 439         /* We failed to handle the error */
 440         return nfs4_map_errors(ret);
 441 wait_on_recovery:
 442         ret = nfs4_wait_clnt_recover(clp);
 443         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 444                 return -EIO;
 445         if (ret == 0)
 446                 exception->retry = 1;
 447         return ret;
 448 }
 449
 450 /*
 451  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 452  * or 'false' otherwise.
 453  */
 454 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 455 {
 456         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 457
 458         if (flavor == RPC_AUTH_GSS_KRB5I ||
 459             flavor == RPC_AUTH_GSS_KRB5P)
 460                 return true;
 461
 462         return false;
 463 }
 464
 465 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 466 {
 467         spin_lock(&clp->cl_lock);
 468         if (time_before(clp->cl_last_renewal,timestamp))
 469                 clp->cl_last_renewal = timestamp;
 470         spin_unlock(&clp->cl_lock);
 471 }
 472
 473 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 474 {
 475         do_renew_lease(server->nfs_client, timestamp);
 476 }
 477
 478 struct nfs4_call_sync_data {
 479         const struct nfs_server *seq_server;
 480         struct nfs4_sequence_args *seq_args;
 481         struct nfs4_sequence_res *seq_res;
 482 };
 483
 484 static void nfs4_init_sequence(struct nfs4_sequence_args *args,
 485                                struct nfs4_sequence_res *res, int cache_reply)
 486 {
 487         args->sa_slot = NULL;
 488         args->sa_cache_this = cache_reply;
 489         args->sa_privileged = 0;
 490
 491         res->sr_slot = NULL;
 492 }
 493
 494 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 495 {
 496         args->sa_privileged = 1;
 497 }
 498
 499 int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 500                          struct nfs4_sequence_args *args,
 501                          struct nfs4_sequence_res *res,
 502                          struct rpc_task *task)
 503 {
 504         struct nfs4_slot *slot;
 505
 506         /* slot already allocated? */
 507         if (res->sr_slot != NULL)
 508                 goto out_start;
 509
 510         spin_lock(&tbl->slot_tbl_lock);
 511         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 512                 goto out_sleep;
 513
 514         slot = nfs4_alloc_slot(tbl);
 515         if (IS_ERR(slot)) {
 516                 if (slot == ERR_PTR(-ENOMEM))
 517                         task->tk_timeout = HZ >> 2;
 518                 goto out_sleep;
 519         }
 520         spin_unlock(&tbl->slot_tbl_lock);
 521
 522         args->sa_slot = slot;
 523         res->sr_slot = slot;
 524
 525 out_start:
 526         rpc_call_start(task);
 527         return 0;
 528
 529 out_sleep:
 530         if (args->sa_privileged)
 531                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 532                                 NULL, RPC_PRIORITY_PRIVILEGED);
 533         else
 534                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 535         spin_unlock(&tbl->slot_tbl_lock);
 536         return -EAGAIN;
 537 }
 538 EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
 539
 540 static int nfs40_sequence_done(struct rpc_task *task,
 541                                struct nfs4_sequence_res *res)
 542 {
 543         struct nfs4_slot *slot = res->sr_slot;
 544         struct nfs4_slot_table *tbl;
 545
 546         if (slot == NULL)
 547                 goto out;
 548
 549         tbl = slot->table;
 550         spin_lock(&tbl->slot_tbl_lock);
 551         if (!nfs41_wake_and_assign_slot(tbl, slot))
 552                 nfs4_free_slot(tbl, slot);
 553         spin_unlock(&tbl->slot_tbl_lock);
 554
 555         res->sr_slot = NULL;
 556 out:
 557         return 1;
 558 }
 559
 560 #if defined(CONFIG_NFS_V4_1)
 561
 562 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 563 {
 564         struct nfs4_session *session;
 565         struct nfs4_slot_table *tbl;
 566         struct nfs4_slot *slot = res->sr_slot;
 567         bool send_new_highest_used_slotid = false;
 568
 569         tbl = slot->table;
 570         session = tbl->session;
 571
 572         spin_lock(&tbl->slot_tbl_lock);
 573         /* Be nice to the server: try to ensure that the last transmitted
 574          * value for highest_user_slotid <= target_highest_slotid
 575          */
 576         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 577                 send_new_highest_used_slotid = true;
 578
 579         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 580                 send_new_highest_used_slotid = false;
 581                 goto out_unlock;
 582         }
 583         nfs4_free_slot(tbl, slot);
 584
 585         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 586                 send_new_highest_used_slotid = false;
 587 out_unlock:
 588         spin_unlock(&tbl->slot_tbl_lock);
 589         res->sr_slot = NULL;
 590         if (send_new_highest_used_slotid)
 591                 nfs41_server_notify_highest_slotid_update(session->clp);
 592 }
 593
 594 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 595 {
 596         struct nfs4_session *session;
 597         struct nfs4_slot *slot = res->sr_slot;
 598         struct nfs_client *clp;
 599         bool interrupted = false;
 600         int ret = 1;
 601
 602         if (slot == NULL)
 603                 goto out_noaction;
 604         /* don't increment the sequence number if the task wasn't sent */
 605         if (!RPC_WAS_SENT(task))
 606                 goto out;
 607
 608         session = slot->table->session;
 609
 610         if (slot->interrupted) {
 611                 slot->interrupted = 0;
 612                 interrupted = true;
 613         }
 614
 615         trace_nfs4_sequence_done(session, res);
 616         /* Check the SEQUENCE operation status */
 617         switch (res->sr_status) {
 618         case 0:
 619                 /* Update the slot's sequence and clientid lease timer */
 620                 ++slot->seq_nr;
 621                 clp = session->clp;
 622                 do_renew_lease(clp, res->sr_timestamp);
 623                 /* Check sequence flags */
 624                 if (res->sr_status_flags != 0)
 625                         nfs4_schedule_lease_recovery(clp);
 626                 nfs41_update_target_slotid(slot->table, slot, res);
 627                 break;
 628         case 1:
 629                 /*
 630                  * sr_status remains 1 if an RPC level error occurred.
 631                  * The server may or may not have processed the sequence
 632                  * operation..
 633                  * Mark the slot as having hosted an interrupted RPC call.
 634                  */
 635                 slot->interrupted = 1;
 636                 goto out;
 637         case -NFS4ERR_DELAY:
 638                 /* The server detected a resend of the RPC call and
 639                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 640                  * of RFC5661.
 641                  */
 642                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 643                         __func__,
 644                         slot->slot_nr,
 645                         slot->seq_nr);
 646                 goto out_retry;
 647         case -NFS4ERR_BADSLOT:
 648                 /*
 649                  * The slot id we used was probably retired. Try again
 650                  * using a different slot id.
 651                  */
 652                 goto retry_nowait;
 653         case -NFS4ERR_SEQ_MISORDERED:
 654                 /*
 655                  * Was the last operation on this sequence interrupted?
 656                  * If so, retry after bumping the sequence number.
 657                  */
 658                 if (interrupted) {
 659                         ++slot->seq_nr;
 660                         goto retry_nowait;
 661                 }
 662                 /*
 663                  * Could this slot have been previously retired?
 664                  * If so, then the server may be expecting seq_nr = 1!
 665                  */
 666                 if (slot->seq_nr != 1) {
 667                         slot->seq_nr = 1;
 668                         goto retry_nowait;
 669                 }
 670                 break;
 671         case -NFS4ERR_SEQ_FALSE_RETRY:
 672                 ++slot->seq_nr;
 673                 goto retry_nowait;
 674         default:
 675                 /* Just update the slot sequence no. */
 676                 ++slot->seq_nr;
 677         }
 678 out:
 679         /* The session may be reset by one of the error handlers. */
 680         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 681         nfs41_sequence_free_slot(res);
 682 out_noaction:
 683         return ret;
 684 retry_nowait:
 685         if (rpc_restart_call_prepare(task)) {
 686                 task->tk_status = 0;
 687                 ret = 0;
 688         }
 689         goto out;
 690 out_retry:
 691         if (!rpc_restart_call(task))
 692                 goto out;
 693         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 694         return 0;
 695 }
 696 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 697
 698 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 699 {
 700         if (res->sr_slot == NULL)
 701                 return 1;
 702         if (!res->sr_slot->table->session)
 703                 return nfs40_sequence_done(task, res);
 704         return nfs41_sequence_done(task, res);
 705 }
 706 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 707
 708 int nfs41_setup_sequence(struct nfs4_session *session,
 709                                 struct nfs4_sequence_args *args,
 710                                 struct nfs4_sequence_res *res,
 711                                 struct rpc_task *task)
 712 {
 713         struct nfs4_slot *slot;
 714         struct nfs4_slot_table *tbl;
 715
 716         dprintk("--> %s\n", __func__);
 717         /* slot already allocated? */
 718         if (res->sr_slot != NULL)
 719                 goto out_success;
 720
 721         tbl = &session->fc_slot_table;
 722
 723         task->tk_timeout = 0;
 724
 725         spin_lock(&tbl->slot_tbl_lock);
 726         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 727             !args->sa_privileged) {
 728                 /* The state manager will wait until the slot table is empty */
 729                 dprintk("%s session is draining\n", __func__);
 730                 goto out_sleep;
 731         }
 732
 733         slot = nfs4_alloc_slot(tbl);
 734         if (IS_ERR(slot)) {
 735                 /* If out of memory, try again in 1/4 second */
 736                 if (slot == ERR_PTR(-ENOMEM))
 737                         task->tk_timeout = HZ >> 2;
 738                 dprintk("<-- %s: no free slots\n", __func__);
 739                 goto out_sleep;
 740         }
 741         spin_unlock(&tbl->slot_tbl_lock);
 742
 743         args->sa_slot = slot;
 744
 745         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 746                         slot->slot_nr, slot->seq_nr);
 747
 748         res->sr_slot = slot;
 749         res->sr_timestamp = jiffies;
 750         res->sr_status_flags = 0;
 751         /*
 752          * sr_status is only set in decode_sequence, and so will remain
 753          * set to 1 if an rpc level failure occurs.
 754          */
 755         res->sr_status = 1;
 756         trace_nfs4_setup_sequence(session, args);
 757 out_success:
 758         rpc_call_start(task);
 759         return 0;
 760 out_sleep:
 761         /* Privileged tasks are queued with top priority */
 762         if (args->sa_privileged)
 763                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 764                                 NULL, RPC_PRIORITY_PRIVILEGED);
 765         else
 766                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 767         spin_unlock(&tbl->slot_tbl_lock);
 768         return -EAGAIN;
 769 }
 770 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 771
 772 static int nfs4_setup_sequence(const struct nfs_server *server,
 773                                struct nfs4_sequence_args *args,
 774                                struct nfs4_sequence_res *res,
 775                                struct rpc_task *task)
 776 {
 777         struct nfs4_session *session = nfs4_get_session(server);
 778         int ret = 0;
 779
 780         if (!session)
 781                 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 782                                             args, res, task);
 783
 784         dprintk("--> %s clp %p session %p sr_slot %u\n",
 785                 __func__, session->clp, session, res->sr_slot ?
 786                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 787
 788         ret = nfs41_setup_sequence(session, args, res, task);
 789
 790         dprintk("<-- %s status=%d\n", __func__, ret);
 791         return ret;
 792 }
 793
 794 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 795 {
 796         struct nfs4_call_sync_data *data = calldata;
 797         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 798
 799         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 800
 801         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 802 }
 803
 804 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 805 {
 806         struct nfs4_call_sync_data *data = calldata;
 807
 808         nfs41_sequence_done(task, data->seq_res);
 809 }
 810
 811 static const struct rpc_call_ops nfs41_call_sync_ops = {
 812         .rpc_call_prepare = nfs41_call_sync_prepare,
 813         .rpc_call_done = nfs41_call_sync_done,
 814 };
 815
 816 #else   /* !CONFIG_NFS_V4_1 */
 817
 818 static int nfs4_setup_sequence(const struct nfs_server *server,
 819                                struct nfs4_sequence_args *args,
 820                                struct nfs4_sequence_res *res,
 821                                struct rpc_task *task)
 822 {
 823         return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 824                                     args, res, task);
 825 }
 826
 827 int nfs4_sequence_done(struct rpc_task *task,
 828                        struct nfs4_sequence_res *res)
 829 {
 830         return nfs40_sequence_done(task, res);
 831 }
 832 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 833
 834 #endif  /* !CONFIG_NFS_V4_1 */
 835
 836 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 837 {
 838         struct nfs4_call_sync_data *data = calldata;
 839         nfs4_setup_sequence(data->seq_server,
 840                                 data->seq_args, data->seq_res, task);
 841 }
 842
 843 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 844 {
 845         struct nfs4_call_sync_data *data = calldata;
 846         nfs4_sequence_done(task, data->seq_res);
 847 }
 848
 849 static const struct rpc_call_ops nfs40_call_sync_ops = {
 850         .rpc_call_prepare = nfs40_call_sync_prepare,
 851         .rpc_call_done = nfs40_call_sync_done,
 852 };
 853
 854 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 855                                    struct nfs_server *server,
 856                                    struct rpc_message *msg,
 857                                    struct nfs4_sequence_args *args,
 858                                    struct nfs4_sequence_res *res)
 859 {
 860         int ret;
 861         struct rpc_task *task;
 862         struct nfs_client *clp = server->nfs_client;
 863         struct nfs4_call_sync_data data = {
 864                 .seq_server = server,
 865                 .seq_args = args,
 866                 .seq_res = res,
 867         };
 868         struct rpc_task_setup task_setup = {
 869                 .rpc_client = clnt,
 870                 .rpc_message = msg,
 871                 .callback_ops = clp->cl_mvops->call_sync_ops,
 872                 .callback_data = &data
 873         };
 874
 875         task = rpc_run_task(&task_setup);
 876         if (IS_ERR(task))
 877                 ret = PTR_ERR(task);
 878         else {
 879                 ret = task->tk_status;
 880                 rpc_put_task(task);
 881         }
 882         return ret;
 883 }
 884
 885 int nfs4_call_sync(struct rpc_clnt *clnt,
 886                    struct nfs_server *server,
 887                    struct rpc_message *msg,
 888                    struct nfs4_sequence_args *args,
 889                    struct nfs4_sequence_res *res,
 890                    int cache_reply)
 891 {
 892         nfs4_init_sequence(args, res, cache_reply);
 893         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 894 }
 895
 896 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 897 {
 898         struct nfs_inode *nfsi = NFS_I(dir);
 899
 900         spin_lock(&dir->i_lock);
 901         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 902         if (!cinfo->atomic || cinfo->before != dir->i_version)
 903                 nfs_force_lookup_revalidate(dir);
 904         dir->i_version = cinfo->after;
 905         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
 906         nfs_fscache_invalidate(dir);
 907         spin_unlock(&dir->i_lock);
 908 }
 909
 910 struct nfs4_opendata {
 911         struct kref kref;
 912         struct nfs_openargs o_arg;
 913         struct nfs_openres o_res;
 914         struct nfs_open_confirmargs c_arg;
 915         struct nfs_open_confirmres c_res;
 916         struct nfs4_string owner_name;
 917         struct nfs4_string group_name;
 918         struct nfs_fattr f_attr;
 919         struct nfs4_label *f_label;
 920         struct dentry *dir;
 921         struct dentry *dentry;
 922         struct nfs4_state_owner *owner;
 923         struct nfs4_state *state;
 924         struct iattr attrs;
 925         unsigned long timestamp;
 926         unsigned int rpc_done : 1;
 927         unsigned int file_created : 1;
 928         unsigned int is_recover : 1;
 929         int rpc_status;
 930         int cancelled;
 931 };
 932
 933 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
 934                 int err, struct nfs4_exception *exception)
 935 {
 936         if (err != -EINVAL)
 937                 return false;
 938         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 939                 return false;
 940         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
 941         exception->retry = 1;
 942         return true;
 943 }
 944
 945 static u32
 946 nfs4_map_atomic_open_share(struct nfs_server *server,
 947                 fmode_t fmode, int openflags)
 948 {
 949         u32 res = 0;
 950
 951         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
 952         case FMODE_READ:
 953                 res = NFS4_SHARE_ACCESS_READ;
 954                 break;
 955         case FMODE_WRITE:
 956                 res = NFS4_SHARE_ACCESS_WRITE;
 957                 break;
 958         case FMODE_READ|FMODE_WRITE:
 959                 res = NFS4_SHARE_ACCESS_BOTH;
 960         }
 961         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
 962                 goto out;
 963         /* Want no delegation if we're using O_DIRECT */
 964         if (openflags & O_DIRECT)
 965                 res |= NFS4_SHARE_WANT_NO_DELEG;
 966 out:
 967         return res;
 968 }
 969
 970 static enum open_claim_type4
 971 nfs4_map_atomic_open_claim(struct nfs_server *server,
 972                 enum open_claim_type4 claim)
 973 {
 974         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
 975                 return claim;
 976         switch (claim) {
 977         default:
 978                 return claim;
 979         case NFS4_OPEN_CLAIM_FH:
 980                 return NFS4_OPEN_CLAIM_NULL;
 981         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 982                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
 983         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 984                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
 985         }
 986 }
 987
 988 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 989 {
 990         p->o_res.f_attr = &p->f_attr;
 991         p->o_res.f_label = p->f_label;
 992         p->o_res.seqid = p->o_arg.seqid;
 993         p->c_res.seqid = p->c_arg.seqid;
 994         p->o_res.server = p->o_arg.server;
 995         p->o_res.access_request = p->o_arg.access;
 996         nfs_fattr_init(&p->f_attr);
 997         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
 998 }
 999
1000 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1001                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1002                 const struct iattr *attrs,
1003                 struct nfs4_label *label,
1004                 enum open_claim_type4 claim,
1005                 gfp_t gfp_mask)
1006 {
1007         struct dentry *parent = dget_parent(dentry);
1008         struct inode *dir = d_inode(parent);
1009         struct nfs_server *server = NFS_SERVER(dir);
1010         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1011         struct nfs4_opendata *p;
1012
1013         p = kzalloc(sizeof(*p), gfp_mask);
1014         if (p == NULL)
1015                 goto err;
1016
1017         p->f_label = nfs4_label_alloc(server, gfp_mask);
1018         if (IS_ERR(p->f_label))
1019                 goto err_free_p;
1020
1021         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1022         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1023         if (IS_ERR(p->o_arg.seqid))
1024                 goto err_free_label;
1025         nfs_sb_active(dentry->d_sb);
1026         p->dentry = dget(dentry);
1027         p->dir = parent;
1028         p->owner = sp;
1029         atomic_inc(&sp->so_count);
1030         p->o_arg.open_flags = flags;
1031         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1032         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1033                         fmode, flags);
1034         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1035          * will return permission denied for all bits until close */
1036         if (!(flags & O_EXCL)) {
1037                 /* ask server to check for all possible rights as results
1038                  * are cached */
1039                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1040                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1041         }
1042         p->o_arg.clientid = server->nfs_client->cl_clientid;
1043         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1044         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1045         p->o_arg.name = &dentry->d_name;
1046         p->o_arg.server = server;
1047         p->o_arg.bitmask = nfs4_bitmask(server, label);
1048         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1049         p->o_arg.label = label;
1050         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1051         switch (p->o_arg.claim) {
1052         case NFS4_OPEN_CLAIM_NULL:
1053         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1054         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1055                 p->o_arg.fh = NFS_FH(dir);
1056                 break;
1057         case NFS4_OPEN_CLAIM_PREVIOUS:
1058         case NFS4_OPEN_CLAIM_FH:
1059         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1060         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1061                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1062         }
1063         if (attrs != NULL && attrs->ia_valid != 0) {
1064                 __u32 verf[2];
1065
1066                 p->o_arg.u.attrs = &p->attrs;
1067                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1068
1069                 verf[0] = jiffies;
1070                 verf[1] = current->pid;
1071                 memcpy(p->o_arg.u.verifier.data, verf,
1072                                 sizeof(p->o_arg.u.verifier.data));
1073         }
1074         p->c_arg.fh = &p->o_res.fh;
1075         p->c_arg.stateid = &p->o_res.stateid;
1076         p->c_arg.seqid = p->o_arg.seqid;
1077         nfs4_init_opendata_res(p);
1078         kref_init(&p->kref);
1079         return p;
1080
1081 err_free_label:
1082         nfs4_label_free(p->f_label);
1083 err_free_p:
1084         kfree(p);
1085 err:
1086         dput(parent);
1087         return NULL;
1088 }
1089
1090 static void nfs4_opendata_free(struct kref *kref)
1091 {
1092         struct nfs4_opendata *p = container_of(kref,
1093                         struct nfs4_opendata, kref);
1094         struct super_block *sb = p->dentry->d_sb;
1095
1096         nfs_free_seqid(p->o_arg.seqid);
1097         if (p->state != NULL)
1098                 nfs4_put_open_state(p->state);
1099         nfs4_put_state_owner(p->owner);
1100
1101         nfs4_label_free(p->f_label);
1102
1103         dput(p->dir);
1104         dput(p->dentry);
1105         nfs_sb_deactive(sb);
1106         nfs_fattr_free_names(&p->f_attr);
1107         kfree(p->f_attr.mdsthreshold);
1108         kfree(p);
1109 }
1110
1111 static void nfs4_opendata_put(struct nfs4_opendata *p)
1112 {
1113         if (p != NULL)
1114                 kref_put(&p->kref, nfs4_opendata_free);
1115 }
1116
1117 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1118 {
1119         int ret;
1120
1121         ret = rpc_wait_for_completion_task(task);
1122         return ret;
1123 }
1124
1125 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1126 {
1127         int ret = 0;
1128
1129         if (open_mode & (O_EXCL|O_TRUNC))
1130                 goto out;
1131         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1132                 case FMODE_READ:
1133                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1134                                 && state->n_rdonly != 0;
1135                         break;
1136                 case FMODE_WRITE:
1137                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1138                                 && state->n_wronly != 0;
1139                         break;
1140                 case FMODE_READ|FMODE_WRITE:
1141                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1142                                 && state->n_rdwr != 0;
1143         }
1144 out:
1145         return ret;
1146 }
1147
1148 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
1149 {
1150         if (delegation == NULL)
1151                 return 0;
1152         if ((delegation->type & fmode) != fmode)
1153                 return 0;
1154         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1155                 return 0;
1156         nfs_mark_delegation_referenced(delegation);
1157         return 1;
1158 }
1159
1160 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1161 {
1162         switch (fmode) {
1163                 case FMODE_WRITE:
1164                         state->n_wronly++;
1165                         break;
1166                 case FMODE_READ:
1167                         state->n_rdonly++;
1168                         break;
1169                 case FMODE_READ|FMODE_WRITE:
1170                         state->n_rdwr++;
1171         }
1172         nfs4_state_set_mode_locked(state, state->state | fmode);
1173 }
1174
1175 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1176 {
1177         struct nfs_client *clp = state->owner->so_server->nfs_client;
1178         bool need_recover = false;
1179
1180         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1181                 need_recover = true;
1182         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1183                 need_recover = true;
1184         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1185                 need_recover = true;
1186         if (need_recover)
1187                 nfs4_state_mark_reclaim_nograce(clp, state);
1188 }
1189
1190 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1191                 nfs4_stateid *stateid)
1192 {
1193         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1194                 return true;
1195         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1196                 nfs_test_and_clear_all_open_stateid(state);
1197                 return true;
1198         }
1199         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1200                 return true;
1201         return false;
1202 }
1203
1204 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1205 {
1206         if (state->n_wronly)
1207                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1208         if (state->n_rdonly)
1209                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1210         if (state->n_rdwr)
1211                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1212 }
1213
1214 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1215                 nfs4_stateid *stateid, fmode_t fmode)
1216 {
1217         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1218         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1219         case FMODE_WRITE:
1220                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1221                 break;
1222         case FMODE_READ:
1223                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1224                 break;
1225         case 0:
1226                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1227                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1228                 clear_bit(NFS_OPEN_STATE, &state->flags);
1229         }
1230         if (stateid == NULL)
1231                 return;
1232         /* Handle races with OPEN */
1233         if (!nfs4_stateid_match_other(stateid, &state->open_stateid) ||
1234             !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
1235                 nfs_resync_open_stateid_locked(state);
1236                 return;
1237         }
1238         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1239                 nfs4_stateid_copy(&state->stateid, stateid);
1240         nfs4_stateid_copy(&state->open_stateid, stateid);
1241 }
1242
1243 static void nfs_clear_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1244 {
1245         write_seqlock(&state->seqlock);
1246         nfs_clear_open_stateid_locked(state, stateid, fmode);
1247         write_sequnlock(&state->seqlock);
1248         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1249                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1250 }
1251
1252 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1253 {
1254         switch (fmode) {
1255                 case FMODE_READ:
1256                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1257                         break;
1258                 case FMODE_WRITE:
1259                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1260                         break;
1261                 case FMODE_READ|FMODE_WRITE:
1262                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1263         }
1264         if (!nfs_need_update_open_stateid(state, stateid))
1265                 return;
1266         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1267                 nfs4_stateid_copy(&state->stateid, stateid);
1268         nfs4_stateid_copy(&state->open_stateid, stateid);
1269 }
1270
1271 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1272 {
1273         /*
1274          * Protect the call to nfs4_state_set_mode_locked and
1275          * serialise the stateid update
1276          */
1277         write_seqlock(&state->seqlock);
1278         if (deleg_stateid != NULL) {
1279                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1280                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1281         }
1282         if (open_stateid != NULL)
1283                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1284         write_sequnlock(&state->seqlock);
1285         spin_lock(&state->owner->so_lock);
1286         update_open_stateflags(state, fmode);
1287         spin_unlock(&state->owner->so_lock);
1288 }
1289
1290 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1291 {
1292         struct nfs_inode *nfsi = NFS_I(state->inode);
1293         struct nfs_delegation *deleg_cur;
1294         int ret = 0;
1295
1296         fmode &= (FMODE_READ|FMODE_WRITE);
1297
1298         rcu_read_lock();
1299         deleg_cur = rcu_dereference(nfsi->delegation);
1300         if (deleg_cur == NULL)
1301                 goto no_delegation;
1302
1303         spin_lock(&deleg_cur->lock);
1304         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1305            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1306             (deleg_cur->type & fmode) != fmode)
1307                 goto no_delegation_unlock;
1308
1309         if (delegation == NULL)
1310                 delegation = &deleg_cur->stateid;
1311         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1312                 goto no_delegation_unlock;
1313
1314         nfs_mark_delegation_referenced(deleg_cur);
1315         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1316         ret = 1;
1317 no_delegation_unlock:
1318         spin_unlock(&deleg_cur->lock);
1319 no_delegation:
1320         rcu_read_unlock();
1321
1322         if (!ret && open_stateid != NULL) {
1323                 __update_open_stateid(state, open_stateid, NULL, fmode);
1324                 ret = 1;
1325         }
1326         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1327                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1328
1329         return ret;
1330 }
1331
1332 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1333                 const nfs4_stateid *stateid)
1334 {
1335         struct nfs4_state *state = lsp->ls_state;
1336         bool ret = false;
1337
1338         spin_lock(&state->state_lock);
1339         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1340                 goto out_noupdate;
1341         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1342                 goto out_noupdate;
1343         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1344         ret = true;
1345 out_noupdate:
1346         spin_unlock(&state->state_lock);
1347         return ret;
1348 }
1349
1350 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1351 {
1352         struct nfs_delegation *delegation;
1353
1354         rcu_read_lock();
1355         delegation = rcu_dereference(NFS_I(inode)->delegation);
1356         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1357                 rcu_read_unlock();
1358                 return;
1359         }
1360         rcu_read_unlock();
1361         nfs4_inode_return_delegation(inode);
1362 }
1363
1364 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1365 {
1366         struct nfs4_state *state = opendata->state;
1367         struct nfs_inode *nfsi = NFS_I(state->inode);
1368         struct nfs_delegation *delegation;
1369         int open_mode = opendata->o_arg.open_flags;
1370         fmode_t fmode = opendata->o_arg.fmode;
1371         nfs4_stateid stateid;
1372         int ret = -EAGAIN;
1373
1374         for (;;) {
1375                 spin_lock(&state->owner->so_lock);
1376                 if (can_open_cached(state, fmode, open_mode)) {
1377                         update_open_stateflags(state, fmode);
1378                         spin_unlock(&state->owner->so_lock);
1379                         goto out_return_state;
1380                 }
1381                 spin_unlock(&state->owner->so_lock);
1382                 rcu_read_lock();
1383                 delegation = rcu_dereference(nfsi->delegation);
1384                 if (!can_open_delegated(delegation, fmode)) {
1385                         rcu_read_unlock();
1386                         break;
1387                 }
1388                 /* Save the delegation */
1389                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1390                 rcu_read_unlock();
1391                 nfs_release_seqid(opendata->o_arg.seqid);
1392                 if (!opendata->is_recover) {
1393                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1394                         if (ret != 0)
1395                                 goto out;
1396                 }
1397                 ret = -EAGAIN;
1398
1399                 /* Try to update the stateid using the delegation */
1400                 if (update_open_stateid(state, NULL, &stateid, fmode))
1401                         goto out_return_state;
1402         }
1403 out:
1404         return ERR_PTR(ret);
1405 out_return_state:
1406         atomic_inc(&state->count);
1407         return state;
1408 }
1409
1410 static void
1411 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1412 {
1413         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1414         struct nfs_delegation *delegation;
1415         int delegation_flags = 0;
1416
1417         rcu_read_lock();
1418         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1419         if (delegation)
1420                 delegation_flags = delegation->flags;
1421         rcu_read_unlock();
1422         if (data->o_arg.claim == NFS4_OPEN_CLAIM_DELEGATE_CUR) {
1423                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1424                                    "returning a delegation for "
1425                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1426                                    clp->cl_hostname);
1427         } else if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1428                 nfs_inode_set_delegation(state->inode,
1429                                          data->owner->so_cred,
1430                                          &data->o_res);
1431         else
1432                 nfs_inode_reclaim_delegation(state->inode,
1433                                              data->owner->so_cred,
1434                                              &data->o_res);
1435 }
1436
1437 /*
1438  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1439  * and update the nfs4_state.
1440  */
1441 static struct nfs4_state *
1442 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1443 {
1444         struct inode *inode = data->state->inode;
1445         struct nfs4_state *state = data->state;
1446         int ret;
1447
1448         if (!data->rpc_done) {
1449                 if (data->rpc_status) {
1450                         ret = data->rpc_status;
1451                         goto err;
1452                 }
1453                 /* cached opens have already been processed */
1454                 goto update;
1455         }
1456
1457         ret = nfs_refresh_inode(inode, &data->f_attr);
1458         if (ret)
1459                 goto err;
1460
1461         if (data->o_res.delegation_type != 0)
1462                 nfs4_opendata_check_deleg(data, state);
1463 update:
1464         update_open_stateid(state, &data->o_res.stateid, NULL,
1465                             data->o_arg.fmode);
1466         atomic_inc(&state->count);
1467
1468         return state;
1469 err:
1470         return ERR_PTR(ret);
1471
1472 }
1473
1474 static struct nfs4_state *
1475 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1476 {
1477         struct inode *inode;
1478         struct nfs4_state *state = NULL;
1479         int ret;
1480
1481         if (!data->rpc_done) {
1482                 state = nfs4_try_open_cached(data);
1483                 goto out;
1484         }
1485
1486         ret = -EAGAIN;
1487         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1488                 goto err;
1489         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1490         ret = PTR_ERR(inode);
1491         if (IS_ERR(inode))
1492                 goto err;
1493         ret = -ENOMEM;
1494         state = nfs4_get_open_state(inode, data->owner);
1495         if (state == NULL)
1496                 goto err_put_inode;
1497         if (data->o_res.delegation_type != 0)
1498                 nfs4_opendata_check_deleg(data, state);
1499         update_open_stateid(state, &data->o_res.stateid, NULL,
1500                         data->o_arg.fmode);
1501         iput(inode);
1502 out:
1503         nfs_release_seqid(data->o_arg.seqid);
1504         return state;
1505 err_put_inode:
1506         iput(inode);
1507 err:
1508         return ERR_PTR(ret);
1509 }
1510
1511 static struct nfs4_state *
1512 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1513 {
1514         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1515                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1516         return _nfs4_opendata_to_nfs4_state(data);
1517 }
1518
1519 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1520 {
1521         struct nfs_inode *nfsi = NFS_I(state->inode);
1522         struct nfs_open_context *ctx;
1523
1524         spin_lock(&state->inode->i_lock);
1525         list_for_each_entry(ctx, &nfsi->open_files, list) {
1526                 if (ctx->state != state)
1527                         continue;
1528                 get_nfs_open_context(ctx);
1529                 spin_unlock(&state->inode->i_lock);
1530                 return ctx;
1531         }
1532         spin_unlock(&state->inode->i_lock);
1533         return ERR_PTR(-ENOENT);
1534 }
1535
1536 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1537                 struct nfs4_state *state, enum open_claim_type4 claim)
1538 {
1539         struct nfs4_opendata *opendata;
1540
1541         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1542                         NULL, NULL, claim, GFP_NOFS);
1543         if (opendata == NULL)
1544                 return ERR_PTR(-ENOMEM);
1545         opendata->state = state;
1546         atomic_inc(&state->count);
1547         return opendata;
1548 }
1549
1550 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
1551 {
1552         struct nfs4_state *newstate;
1553         int ret;
1554
1555         opendata->o_arg.open_flags = 0;
1556         opendata->o_arg.fmode = fmode;
1557         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1558                         NFS_SB(opendata->dentry->d_sb),
1559                         fmode, 0);
1560         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1561         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1562         nfs4_init_opendata_res(opendata);
1563         ret = _nfs4_recover_proc_open(opendata);
1564         if (ret != 0)
1565                 return ret;
1566         newstate = nfs4_opendata_to_nfs4_state(opendata);
1567         if (IS_ERR(newstate))
1568                 return PTR_ERR(newstate);
1569         nfs4_close_state(newstate, fmode);
1570         *res = newstate;
1571         return 0;
1572 }
1573
1574 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1575 {
1576         struct nfs4_state *newstate;
1577         int ret;
1578
1579         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1580         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1581         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1582         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1583         /* memory barrier prior to reading state->n_* */
1584         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1585         clear_bit(NFS_OPEN_STATE, &state->flags);
1586         smp_rmb();
1587         if (state->n_rdwr != 0) {
1588                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
1589                 if (ret != 0)
1590                         return ret;
1591                 if (newstate != state)
1592                         return -ESTALE;
1593         }
1594         if (state->n_wronly != 0) {
1595                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
1596                 if (ret != 0)
1597                         return ret;
1598                 if (newstate != state)
1599                         return -ESTALE;
1600         }
1601         if (state->n_rdonly != 0) {
1602                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
1603                 if (ret != 0)
1604                         return ret;
1605                 if (newstate != state)
1606                         return -ESTALE;
1607         }
1608         /*
1609          * We may have performed cached opens for all three recoveries.
1610          * Check if we need to update the current stateid.
1611          */
1612         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1613             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1614                 write_seqlock(&state->seqlock);
1615                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1616                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1617                 write_sequnlock(&state->seqlock);
1618         }
1619         return 0;
1620 }
1621
1622 /*
1623  * OPEN_RECLAIM:
1624  *      reclaim state on the server after a reboot.
1625  */
1626 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1627 {
1628         struct nfs_delegation *delegation;
1629         struct nfs4_opendata *opendata;
1630         fmode_t delegation_type = 0;
1631         int status;
1632
1633         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1634                         NFS4_OPEN_CLAIM_PREVIOUS);
1635         if (IS_ERR(opendata))
1636                 return PTR_ERR(opendata);
1637         rcu_read_lock();
1638         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1639         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1640                 delegation_type = delegation->type;
1641         rcu_read_unlock();
1642         opendata->o_arg.u.delegation_type = delegation_type;
1643         status = nfs4_open_recover(opendata, state);
1644         nfs4_opendata_put(opendata);
1645         return status;
1646 }
1647
1648 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1649 {
1650         struct nfs_server *server = NFS_SERVER(state->inode);
1651         struct nfs4_exception exception = { };
1652         int err;
1653         do {
1654                 err = _nfs4_do_open_reclaim(ctx, state);
1655                 trace_nfs4_open_reclaim(ctx, 0, err);
1656                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1657                         continue;
1658                 if (err != -NFS4ERR_DELAY)
1659                         break;
1660                 nfs4_handle_exception(server, err, &exception);
1661         } while (exception.retry);
1662         return err;
1663 }
1664
1665 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1666 {
1667         struct nfs_open_context *ctx;
1668         int ret;
1669
1670         ctx = nfs4_state_find_open_context(state);
1671         if (IS_ERR(ctx))
1672                 return -EAGAIN;
1673         ret = nfs4_do_open_reclaim(ctx, state);
1674         put_nfs_open_context(ctx);
1675         return ret;
1676 }
1677
1678 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1679 {
1680         switch (err) {
1681                 default:
1682                         printk(KERN_ERR "NFS: %s: unhandled error "
1683                                         "%d.\n", __func__, err);
1684                 case 0:
1685                 case -ENOENT:
1686                 case -ESTALE:
1687                         break;
1688                 case -NFS4ERR_BADSESSION:
1689                 case -NFS4ERR_BADSLOT:
1690                 case -NFS4ERR_BAD_HIGH_SLOT:
1691                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1692                 case -NFS4ERR_DEADSESSION:
1693                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1694                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1695                         return -EAGAIN;
1696                 case -NFS4ERR_STALE_CLIENTID:
1697                 case -NFS4ERR_STALE_STATEID:
1698                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1699                 case -NFS4ERR_EXPIRED:
1700                         /* Don't recall a delegation if it was lost */
1701                         nfs4_schedule_lease_recovery(server->nfs_client);
1702                         return -EAGAIN;
1703                 case -NFS4ERR_MOVED:
1704                         nfs4_schedule_migration_recovery(server);
1705                         return -EAGAIN;
1706                 case -NFS4ERR_LEASE_MOVED:
1707                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1708                         return -EAGAIN;
1709                 case -NFS4ERR_DELEG_REVOKED:
1710                 case -NFS4ERR_ADMIN_REVOKED:
1711                 case -NFS4ERR_BAD_STATEID:
1712                 case -NFS4ERR_OPENMODE:
1713                         nfs_inode_find_state_and_recover(state->inode,
1714                                         stateid);
1715                         nfs4_schedule_stateid_recovery(server, state);
1716                         return -EAGAIN;
1717                 case -NFS4ERR_DELAY:
1718                 case -NFS4ERR_GRACE:
1719                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1720                         ssleep(1);
1721                         return -EAGAIN;
1722                 case -ENOMEM:
1723                 case -NFS4ERR_DENIED:
1724                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1725                         return 0;
1726         }
1727         return err;
1728 }
1729
1730 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
1731 {
1732         struct nfs_server *server = NFS_SERVER(state->inode);
1733         struct nfs4_opendata *opendata;
1734         int err;
1735
1736         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1737                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1738         if (IS_ERR(opendata))
1739                 return PTR_ERR(opendata);
1740         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1741         err = nfs4_open_recover(opendata, state);
1742         nfs4_opendata_put(opendata);
1743         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1744 }
1745
1746 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1747 {
1748         struct nfs4_opendata *data = calldata;
1749
1750         nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
1751                              &data->c_arg.seq_args, &data->c_res.seq_res, task);
1752 }
1753
1754 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1755 {
1756         struct nfs4_opendata *data = calldata;
1757
1758         nfs40_sequence_done(task, &data->c_res.seq_res);
1759
1760         data->rpc_status = task->tk_status;
1761         if (data->rpc_status == 0) {
1762                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1763                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1764                 renew_lease(data->o_res.server, data->timestamp);
1765                 data->rpc_done = 1;
1766         }
1767 }
1768
1769 static void nfs4_open_confirm_release(void *calldata)
1770 {
1771         struct nfs4_opendata *data = calldata;
1772         struct nfs4_state *state = NULL;
1773
1774         /* If this request hasn't been cancelled, do nothing */
1775         if (data->cancelled == 0)
1776                 goto out_free;
1777         /* In case of error, no cleanup! */
1778         if (!data->rpc_done)
1779                 goto out_free;
1780         state = nfs4_opendata_to_nfs4_state(data);
1781         if (!IS_ERR(state))
1782                 nfs4_close_state(state, data->o_arg.fmode);
1783 out_free:
1784         nfs4_opendata_put(data);
1785 }
1786
1787 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1788         .rpc_call_prepare = nfs4_open_confirm_prepare,
1789         .rpc_call_done = nfs4_open_confirm_done,
1790         .rpc_release = nfs4_open_confirm_release,
1791 };
1792
1793 /*
1794  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1795  */
1796 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1797 {
1798         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
1799         struct rpc_task *task;
1800         struct  rpc_message msg = {
1801                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1802                 .rpc_argp = &data->c_arg,
1803                 .rpc_resp = &data->c_res,
1804                 .rpc_cred = data->owner->so_cred,
1805         };
1806         struct rpc_task_setup task_setup_data = {
1807                 .rpc_client = server->client,
1808                 .rpc_message = &msg,
1809                 .callback_ops = &nfs4_open_confirm_ops,
1810                 .callback_data = data,
1811                 .workqueue = nfsiod_workqueue,
1812                 .flags = RPC_TASK_ASYNC,
1813         };
1814         int status;
1815
1816         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1817         kref_get(&data->kref);
1818         data->rpc_done = 0;
1819         data->rpc_status = 0;
1820         data->timestamp = jiffies;
1821         task = rpc_run_task(&task_setup_data);
1822         if (IS_ERR(task))
1823                 return PTR_ERR(task);
1824         status = nfs4_wait_for_completion_rpc_task(task);
1825         if (status != 0) {
1826                 data->cancelled = 1;
1827                 smp_wmb();
1828         } else
1829                 status = data->rpc_status;
1830         rpc_put_task(task);
1831         return status;
1832 }
1833
1834 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1835 {
1836         struct nfs4_opendata *data = calldata;
1837         struct nfs4_state_owner *sp = data->owner;
1838         struct nfs_client *clp = sp->so_server->nfs_client;
1839
1840         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1841                 goto out_wait;
1842         /*
1843          * Check if we still need to send an OPEN call, or if we can use
1844          * a delegation instead.
1845          */
1846         if (data->state != NULL) {
1847                 struct nfs_delegation *delegation;
1848
1849                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1850                         goto out_no_action;
1851                 rcu_read_lock();
1852                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1853                 if (data->o_arg.claim != NFS4_OPEN_CLAIM_DELEGATE_CUR &&
1854                     data->o_arg.claim != NFS4_OPEN_CLAIM_DELEG_CUR_FH &&
1855                     can_open_delegated(delegation, data->o_arg.fmode))
1856                         goto unlock_no_action;
1857                 rcu_read_unlock();
1858         }
1859         /* Update client id. */
1860         data->o_arg.clientid = clp->cl_clientid;
1861         switch (data->o_arg.claim) {
1862         case NFS4_OPEN_CLAIM_PREVIOUS:
1863         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1864         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1865                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1866         case NFS4_OPEN_CLAIM_FH:
1867                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1868                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1869         }
1870         data->timestamp = jiffies;
1871         if (nfs4_setup_sequence(data->o_arg.server,
1872                                 &data->o_arg.seq_args,
1873                                 &data->o_res.seq_res,
1874                                 task) != 0)
1875                 nfs_release_seqid(data->o_arg.seqid);
1876
1877         /* Set the create mode (note dependency on the session type) */
1878         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
1879         if (data->o_arg.open_flags & O_EXCL) {
1880                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
1881                 if (nfs4_has_persistent_session(clp))
1882                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
1883                 else if (clp->cl_mvops->minor_version > 0)
1884                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
1885         }
1886         return;
1887 unlock_no_action:
1888         rcu_read_unlock();
1889 out_no_action:
1890         task->tk_action = NULL;
1891 out_wait:
1892         nfs4_sequence_done(task, &data->o_res.seq_res);
1893 }
1894
1895 static void nfs4_open_done(struct rpc_task *task, void *calldata)
1896 {
1897         struct nfs4_opendata *data = calldata;
1898
1899         data->rpc_status = task->tk_status;
1900
1901         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
1902                 return;
1903
1904         if (task->tk_status == 0) {
1905                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
1906                         switch (data->o_res.f_attr->mode & S_IFMT) {
1907                         case S_IFREG:
1908                                 break;
1909                         case S_IFLNK:
1910                                 data->rpc_status = -ELOOP;
1911                                 break;
1912                         case S_IFDIR:
1913                                 data->rpc_status = -EISDIR;
1914                                 break;
1915                         default:
1916                                 data->rpc_status = -ENOTDIR;
1917                         }
1918                 }
1919                 renew_lease(data->o_res.server, data->timestamp);
1920                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
1921                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
1922         }
1923         data->rpc_done = 1;
1924 }
1925
1926 static void nfs4_open_release(void *calldata)
1927 {
1928         struct nfs4_opendata *data = calldata;
1929         struct nfs4_state *state = NULL;
1930
1931         /* If this request hasn't been cancelled, do nothing */
1932         if (data->cancelled == 0)
1933                 goto out_free;
1934         /* In case of error, no cleanup! */
1935         if (data->rpc_status != 0 || !data->rpc_done)
1936                 goto out_free;
1937         /* In case we need an open_confirm, no cleanup! */
1938         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
1939                 goto out_free;
1940         state = nfs4_opendata_to_nfs4_state(data);
1941         if (!IS_ERR(state))
1942                 nfs4_close_state(state, data->o_arg.fmode);
1943 out_free:
1944         nfs4_opendata_put(data);
1945 }
1946
1947 static const struct rpc_call_ops nfs4_open_ops = {
1948         .rpc_call_prepare = nfs4_open_prepare,
1949         .rpc_call_done = nfs4_open_done,
1950         .rpc_release = nfs4_open_release,
1951 };
1952
1953 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
1954 {
1955         struct inode *dir = d_inode(data->dir);
1956         struct nfs_server *server = NFS_SERVER(dir);
1957         struct nfs_openargs *o_arg = &data->o_arg;
1958         struct nfs_openres *o_res = &data->o_res;
1959         struct rpc_task *task;
1960         struct rpc_message msg = {
1961                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1962                 .rpc_argp = o_arg,
1963                 .rpc_resp = o_res,
1964                 .rpc_cred = data->owner->so_cred,
1965         };
1966         struct rpc_task_setup task_setup_data = {
1967                 .rpc_client = server->client,
1968                 .rpc_message = &msg,
1969                 .callback_ops = &nfs4_open_ops,
1970                 .callback_data = data,
1971                 .workqueue = nfsiod_workqueue,
1972                 .flags = RPC_TASK_ASYNC,
1973         };
1974         int status;
1975
1976         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
1977         kref_get(&data->kref);
1978         data->rpc_done = 0;
1979         data->rpc_status = 0;
1980         data->cancelled = 0;
1981         data->is_recover = 0;
1982         if (isrecover) {
1983                 nfs4_set_sequence_privileged(&o_arg->seq_args);
1984                 data->is_recover = 1;
1985         }
1986         task = rpc_run_task(&task_setup_data);
1987         if (IS_ERR(task))
1988                 return PTR_ERR(task);
1989         status = nfs4_wait_for_completion_rpc_task(task);
1990         if (status != 0) {
1991                 data->cancelled = 1;
1992                 smp_wmb();
1993         } else
1994                 status = data->rpc_status;
1995         rpc_put_task(task);
1996
1997         return status;
1998 }
1999
2000 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2001 {
2002         struct inode *dir = d_inode(data->dir);
2003         struct nfs_openres *o_res = &data->o_res;
2004         int status;
2005
2006         status = nfs4_run_open_task(data, 1);
2007         if (status != 0 || !data->rpc_done)
2008                 return status;
2009
2010         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2011
2012         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2013                 status = _nfs4_proc_open_confirm(data);
2014                 if (status != 0)
2015                         return status;
2016         }
2017
2018         return status;
2019 }
2020
2021 /*
2022  * Additional permission checks in order to distinguish between an
2023  * open for read, and an open for execute. This works around the
2024  * fact that NFSv4 OPEN treats read and execute permissions as being
2025  * the same.
2026  * Note that in the non-execute case, we want to turn off permission
2027  * checking if we just created a new file (POSIX open() semantics).
2028  */
2029 static int nfs4_opendata_access(struct rpc_cred *cred,
2030                                 struct nfs4_opendata *opendata,
2031                                 struct nfs4_state *state, fmode_t fmode,
2032                                 int openflags)
2033 {
2034         struct nfs_access_entry cache;
2035         u32 mask;
2036
2037         /* access call failed or for some reason the server doesn't
2038          * support any access modes -- defer access call until later */
2039         if (opendata->o_res.access_supported == 0)
2040                 return 0;
2041
2042         mask = 0;
2043         /*
2044          * Use openflags to check for exec, because fmode won't
2045          * always have FMODE_EXEC set when file open for exec.
2046          */
2047         if (openflags & __FMODE_EXEC) {
2048                 /* ONLY check for exec rights */
2049                 mask = MAY_EXEC;
2050         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2051                 mask = MAY_READ;
2052
2053         cache.cred = cred;
2054         cache.jiffies = jiffies;
2055         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2056         nfs_access_add_cache(state->inode, &cache);
2057
2058         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2059                 return 0;
2060
2061         /* even though OPEN succeeded, access is denied. Close the file */
2062         nfs4_close_state(state, fmode);
2063         return -EACCES;
2064 }
2065
2066 /*
2067  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2068  */
2069 static int _nfs4_proc_open(struct nfs4_opendata *data)
2070 {
2071         struct inode *dir = d_inode(data->dir);
2072         struct nfs_server *server = NFS_SERVER(dir);
2073         struct nfs_openargs *o_arg = &data->o_arg;
2074         struct nfs_openres *o_res = &data->o_res;
2075         int status;
2076
2077         status = nfs4_run_open_task(data, 0);
2078         if (!data->rpc_done)
2079                 return status;
2080         if (status != 0) {
2081                 if (status == -NFS4ERR_BADNAME &&
2082                                 !(o_arg->open_flags & O_CREAT))
2083                         return -ENOENT;
2084                 return status;
2085         }
2086
2087         nfs_fattr_map_and_free_names(server, &data->f_attr);
2088
2089         if (o_arg->open_flags & O_CREAT) {
2090                 update_changeattr(dir, &o_res->cinfo);
2091                 if (o_arg->open_flags & O_EXCL)
2092                         data->file_created = 1;
2093                 else if (o_res->cinfo.before != o_res->cinfo.after)
2094                         data->file_created = 1;
2095         }
2096         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2097                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2098         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2099                 status = _nfs4_proc_open_confirm(data);
2100                 if (status != 0)
2101                         return status;
2102         }
2103         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2104                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2105         return 0;
2106 }
2107
2108 static int nfs4_recover_expired_lease(struct nfs_server *server)
2109 {
2110         return nfs4_client_recover_expired_lease(server->nfs_client);
2111 }
2112
2113 /*
2114  * OPEN_EXPIRED:
2115  *      reclaim state on the server after a network partition.
2116  *      Assumes caller holds the appropriate lock
2117  */
2118 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2119 {
2120         struct nfs4_opendata *opendata;
2121         int ret;
2122
2123         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2124                         NFS4_OPEN_CLAIM_FH);
2125         if (IS_ERR(opendata))
2126                 return PTR_ERR(opendata);
2127         ret = nfs4_open_recover(opendata, state);
2128         if (ret == -ESTALE)
2129                 d_drop(ctx->dentry);
2130         nfs4_opendata_put(opendata);
2131         return ret;
2132 }
2133
2134 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2135 {
2136         struct nfs_server *server = NFS_SERVER(state->inode);
2137         struct nfs4_exception exception = { };
2138         int err;
2139
2140         do {
2141                 err = _nfs4_open_expired(ctx, state);
2142                 trace_nfs4_open_expired(ctx, 0, err);
2143                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2144                         continue;
2145                 switch (err) {
2146                 default:
2147                         goto out;
2148                 case -NFS4ERR_GRACE:
2149                 case -NFS4ERR_DELAY:
2150                         nfs4_handle_exception(server, err, &exception);
2151                         err = 0;
2152                 }
2153         } while (exception.retry);
2154 out:
2155         return err;
2156 }
2157
2158 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2159 {
2160         struct nfs_open_context *ctx;
2161         int ret;
2162
2163         ctx = nfs4_state_find_open_context(state);
2164         if (IS_ERR(ctx))
2165                 return -EAGAIN;
2166         ret = nfs4_do_open_expired(ctx, state);
2167         put_nfs_open_context(ctx);
2168         return ret;
2169 }
2170
2171 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2172 {
2173         nfs_remove_bad_delegation(state->inode);
2174         write_seqlock(&state->seqlock);
2175         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2176         write_sequnlock(&state->seqlock);
2177         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2178 }
2179
2180 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2181 {
2182         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2183                 nfs_finish_clear_delegation_stateid(state);
2184 }
2185
2186 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2187 {
2188         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2189         nfs40_clear_delegation_stateid(state);
2190         return nfs4_open_expired(sp, state);
2191 }
2192
2193 #if defined(CONFIG_NFS_V4_1)
2194 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2195 {
2196         struct nfs_server *server = NFS_SERVER(state->inode);
2197         nfs4_stateid stateid;
2198         struct nfs_delegation *delegation;
2199         struct rpc_cred *cred;
2200         int status;
2201
2202         /* Get the delegation credential for use by test/free_stateid */
2203         rcu_read_lock();
2204         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2205         if (delegation == NULL) {
2206                 rcu_read_unlock();
2207                 return;
2208         }
2209
2210         nfs4_stateid_copy(&stateid, &delegation->stateid);
2211         cred = get_rpccred(delegation->cred);
2212         rcu_read_unlock();
2213         status = nfs41_test_stateid(server, &stateid, cred);
2214         trace_nfs4_test_delegation_stateid(state, NULL, status);
2215
2216         if (status != NFS_OK) {
2217                 /* Free the stateid unless the server explicitly
2218                  * informs us the stateid is unrecognized. */
2219                 if (status != -NFS4ERR_BAD_STATEID)
2220                         nfs41_free_stateid(server, &stateid, cred);
2221                 nfs_finish_clear_delegation_stateid(state);
2222         }
2223
2224         put_rpccred(cred);
2225 }
2226
2227 /**
2228  * nfs41_check_open_stateid - possibly free an open stateid
2229  *
2230  * @state: NFSv4 state for an inode
2231  *
2232  * Returns NFS_OK if recovery for this stateid is now finished.
2233  * Otherwise a negative NFS4ERR value is returned.
2234  */
2235 static int nfs41_check_open_stateid(struct nfs4_state *state)
2236 {
2237         struct nfs_server *server = NFS_SERVER(state->inode);
2238         nfs4_stateid *stateid = &state->open_stateid;
2239         struct rpc_cred *cred = state->owner->so_cred;
2240         int status;
2241
2242         /* If a state reset has been done, test_stateid is unneeded */
2243         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2244             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2245             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2246                 return -NFS4ERR_BAD_STATEID;
2247
2248         status = nfs41_test_stateid(server, stateid, cred);
2249         trace_nfs4_test_open_stateid(state, NULL, status);
2250         if (status != NFS_OK) {
2251                 /* Free the stateid unless the server explicitly
2252                  * informs us the stateid is unrecognized. */
2253                 if (status != -NFS4ERR_BAD_STATEID)
2254                         nfs41_free_stateid(server, stateid, cred);
2255
2256                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2257                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2258                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2259                 clear_bit(NFS_OPEN_STATE, &state->flags);
2260         }
2261         return status;
2262 }
2263
2264 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2265 {
2266         int status;
2267
2268         nfs41_check_delegation_stateid(state);
2269         status = nfs41_check_open_stateid(state);
2270         if (status != NFS_OK)
2271                 status = nfs4_open_expired(sp, state);
2272         return status;
2273 }
2274 #endif
2275
2276 /*
2277  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2278  * fields corresponding to attributes that were used to store the verifier.
2279  * Make sure we clobber those fields in the later setattr call
2280  */
2281 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
2282 {
2283         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2284             !(sattr->ia_valid & ATTR_ATIME_SET))
2285                 sattr->ia_valid |= ATTR_ATIME;
2286
2287         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2288             !(sattr->ia_valid & ATTR_MTIME_SET))
2289                 sattr->ia_valid |= ATTR_MTIME;
2290 }
2291
2292 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2293                 fmode_t fmode,
2294                 int flags,
2295                 struct nfs_open_context *ctx)
2296 {
2297         struct nfs4_state_owner *sp = opendata->owner;
2298         struct nfs_server *server = sp->so_server;
2299         struct dentry *dentry;
2300         struct nfs4_state *state;
2301         unsigned int seq;
2302         int ret;
2303
2304         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2305
2306         ret = _nfs4_proc_open(opendata);
2307         if (ret != 0)
2308                 goto out;
2309
2310         state = nfs4_opendata_to_nfs4_state(opendata);
2311         ret = PTR_ERR(state);
2312         if (IS_ERR(state))
2313                 goto out;
2314         if (server->caps & NFS_CAP_POSIX_LOCK)
2315                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2316
2317         dentry = opendata->dentry;
2318         if (d_really_is_negative(dentry)) {
2319                 /* FIXME: Is this d_drop() ever needed? */
2320                 d_drop(dentry);
2321                 dentry = d_add_unique(dentry, igrab(state->inode));
2322                 if (dentry == NULL) {
2323                         dentry = opendata->dentry;
2324                 } else if (dentry != ctx->dentry) {
2325                         dput(ctx->dentry);
2326                         ctx->dentry = dget(dentry);
2327                 }
2328                 nfs_set_verifier(dentry,
2329                                 nfs_save_change_attribute(d_inode(opendata->dir)));
2330         }
2331
2332         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2333         if (ret != 0)
2334                 goto out;
2335
2336         ctx->state = state;
2337         if (d_inode(dentry) == state->inode) {
2338                 nfs_inode_attach_open_context(ctx);
2339                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2340                         nfs4_schedule_stateid_recovery(server, state);
2341         }
2342 out:
2343         return ret;
2344 }
2345
2346 /*
2347  * Returns a referenced nfs4_state
2348  */
2349 static int _nfs4_do_open(struct inode *dir,
2350                         struct nfs_open_context *ctx,
2351                         int flags,
2352                         struct iattr *sattr,
2353                         struct nfs4_label *label,
2354                         int *opened)
2355 {
2356         struct nfs4_state_owner  *sp;
2357         struct nfs4_state     *state = NULL;
2358         struct nfs_server       *server = NFS_SERVER(dir);
2359         struct nfs4_opendata *opendata;
2360         struct dentry *dentry = ctx->dentry;
2361         struct rpc_cred *cred = ctx->cred;
2362         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2363         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2364         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2365         struct nfs4_label *olabel = NULL;
2366         int status;
2367
2368         /* Protect against reboot recovery conflicts */
2369         status = -ENOMEM;
2370         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2371         if (sp == NULL) {
2372                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2373                 goto out_err;
2374         }
2375         status = nfs4_recover_expired_lease(server);
2376         if (status != 0)
2377                 goto err_put_state_owner;
2378         if (d_really_is_positive(dentry))
2379                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2380         status = -ENOMEM;
2381         if (d_really_is_positive(dentry))
2382                 claim = NFS4_OPEN_CLAIM_FH;
2383         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2384                         label, claim, GFP_KERNEL);
2385         if (opendata == NULL)
2386                 goto err_put_state_owner;
2387
2388         if (label) {
2389                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2390                 if (IS_ERR(olabel)) {
2391                         status = PTR_ERR(olabel);
2392                         goto err_opendata_put;
2393                 }
2394         }
2395
2396         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2397                 if (!opendata->f_attr.mdsthreshold) {
2398                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2399                         if (!opendata->f_attr.mdsthreshold)
2400                                 goto err_free_label;
2401                 }
2402                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2403         }
2404         if (d_really_is_positive(dentry))
2405                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2406
2407         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2408         if (status != 0)
2409                 goto err_free_label;
2410         state = ctx->state;
2411
2412         if ((opendata->o_arg.open_flags & O_EXCL) &&
2413             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2414                 nfs4_exclusive_attrset(opendata, sattr);
2415
2416                 nfs_fattr_init(opendata->o_res.f_attr);
2417                 status = nfs4_do_setattr(state->inode, cred,
2418                                 opendata->o_res.f_attr, sattr,
2419                                 state, label, olabel);
2420                 if (status == 0) {
2421                         nfs_setattr_update_inode(state->inode, sattr,
2422                                         opendata->o_res.f_attr);
2423                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2424                 }
2425         }
2426         if (opendata->file_created)
2427                 *opened |= FILE_CREATED;
2428
2429         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2430                 *ctx_th = opendata->f_attr.mdsthreshold;
2431                 opendata->f_attr.mdsthreshold = NULL;
2432         }
2433
2434         nfs4_label_free(olabel);
2435
2436         nfs4_opendata_put(opendata);
2437         nfs4_put_state_owner(sp);
2438         return 0;
2439 err_free_label:
2440         nfs4_label_free(olabel);
2441 err_opendata_put:
2442         nfs4_opendata_put(opendata);
2443 err_put_state_owner:
2444         nfs4_put_state_owner(sp);
2445 out_err:
2446         return status;
2447 }
2448
2449
2450 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2451                                         struct nfs_open_context *ctx,
2452                                         int flags,
2453                                         struct iattr *sattr,
2454                                         struct nfs4_label *label,
2455                                         int *opened)
2456 {
2457         struct nfs_server *server = NFS_SERVER(dir);
2458         struct nfs4_exception exception = { };
2459         struct nfs4_state *res;
2460         int status;
2461
2462         do {
2463                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2464                 res = ctx->state;
2465                 trace_nfs4_open_file(ctx, flags, status);
2466                 if (status == 0)
2467                         break;
2468                 /* NOTE: BAD_SEQID means the server and client disagree about the
2469                  * book-keeping w.r.t. state-changing operations
2470                  * (OPEN/CLOSE/LOCK/LOCKU...)
2471                  * It is actually a sign of a bug on the client or on the server.
2472                  *
2473                  * If we receive a BAD_SEQID error in the particular case of
2474                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2475                  * have unhashed the old state_owner for us, and that we can
2476                  * therefore safely retry using a new one. We should still warn
2477                  * the user though...
2478                  */
2479                 if (status == -NFS4ERR_BAD_SEQID) {
2480                         pr_warn_ratelimited("NFS: v4 server %s "
2481                                         " returned a bad sequence-id error!\n",
2482                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2483                         exception.retry = 1;
2484                         continue;
2485                 }
2486                 /*
2487                  * BAD_STATEID on OPEN means that the server cancelled our
2488                  * state before it received the OPEN_CONFIRM.
2489                  * Recover by retrying the request as per the discussion
2490                  * on Page 181 of RFC3530.
2491                  */
2492                 if (status == -NFS4ERR_BAD_STATEID) {
2493                         exception.retry = 1;
2494                         continue;
2495                 }
2496                 if (status == -EAGAIN) {
2497                         /* We must have found a delegation */
2498                         exception.retry = 1;
2499                         continue;
2500                 }
2501                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2502                         continue;
2503                 res = ERR_PTR(nfs4_handle_exception(server,
2504                                         status, &exception));
2505         } while (exception.retry);
2506         return res;
2507 }
2508
2509 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2510                             struct nfs_fattr *fattr, struct iattr *sattr,
2511                             struct nfs4_state *state, struct nfs4_label *ilabel,
2512                             struct nfs4_label *olabel)
2513 {
2514         struct nfs_server *server = NFS_SERVER(inode);
2515         struct nfs_setattrargs  arg = {
2516                 .fh             = NFS_FH(inode),
2517                 .iap            = sattr,
2518                 .server         = server,
2519                 .bitmask = server->attr_bitmask,
2520                 .label          = ilabel,
2521         };
2522         struct nfs_setattrres  res = {
2523                 .fattr          = fattr,
2524                 .label          = olabel,
2525                 .server         = server,
2526         };
2527         struct rpc_message msg = {
2528                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2529                 .rpc_argp       = &arg,
2530                 .rpc_resp       = &res,
2531                 .rpc_cred       = cred,
2532         };
2533         unsigned long timestamp = jiffies;
2534         fmode_t fmode;
2535         bool truncate;
2536         int status;
2537
2538         arg.bitmask = nfs4_bitmask(server, ilabel);
2539         if (ilabel)
2540                 arg.bitmask = nfs4_bitmask(server, olabel);
2541
2542         nfs_fattr_init(fattr);
2543
2544         /* Servers should only apply open mode checks for file size changes */
2545         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2546         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2547
2548         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2549                 /* Use that stateid */
2550         } else if (truncate && state != NULL) {
2551                 struct nfs_lockowner lockowner = {
2552                         .l_owner = current->files,
2553                         .l_pid = current->tgid,
2554                 };
2555                 if (!nfs4_valid_open_stateid(state))
2556                         return -EBADF;
2557                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2558                                 &lockowner) == -EIO)
2559                         return -EBADF;
2560         } else
2561                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2562
2563         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2564         if (status == 0 && state != NULL)
2565                 renew_lease(server, timestamp);
2566         return status;
2567 }
2568
2569 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2570                            struct nfs_fattr *fattr, struct iattr *sattr,
2571                            struct nfs4_state *state, struct nfs4_label *ilabel,
2572                            struct nfs4_label *olabel)
2573 {
2574         struct nfs_server *server = NFS_SERVER(inode);
2575         struct nfs4_exception exception = {
2576                 .state = state,
2577                 .inode = inode,
2578         };
2579         int err;
2580         do {
2581                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2582                 trace_nfs4_setattr(inode, err);
2583                 switch (err) {
2584                 case -NFS4ERR_OPENMODE:
2585                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2586                                 pr_warn_once("NFSv4: server %s is incorrectly "
2587                                                 "applying open mode checks to "
2588                                                 "a SETATTR that is not "
2589                                                 "changing file size.\n",
2590                                                 server->nfs_client->cl_hostname);
2591                         }
2592                         if (state && !(state->state & FMODE_WRITE)) {
2593                                 err = -EBADF;
2594                                 if (sattr->ia_valid & ATTR_OPEN)
2595                                         err = -EACCES;
2596                                 goto out;
2597                         }
2598                 }
2599                 err = nfs4_handle_exception(server, err, &exception);
2600         } while (exception.retry);
2601 out:
2602         return err;
2603 }
2604
2605 struct nfs4_closedata {
2606         struct inode *inode;
2607         struct nfs4_state *state;
2608         struct nfs_closeargs arg;
2609         struct nfs_closeres res;
2610         struct nfs_fattr fattr;
2611         unsigned long timestamp;
2612         bool roc;
2613         u32 roc_barrier;
2614 };
2615
2616 static void nfs4_free_closedata(void *data)
2617 {
2618         struct nfs4_closedata *calldata = data;
2619         struct nfs4_state_owner *sp = calldata->state->owner;
2620         struct super_block *sb = calldata->state->inode->i_sb;
2621
2622         if (calldata->roc)
2623                 pnfs_roc_release(calldata->state->inode);
2624         nfs4_put_open_state(calldata->state);
2625         nfs_free_seqid(calldata->arg.seqid);
2626         nfs4_put_state_owner(sp);
2627         nfs_sb_deactive(sb);
2628         kfree(calldata);
2629 }
2630
2631 static void nfs4_close_done(struct rpc_task *task, void *data)
2632 {
2633         struct nfs4_closedata *calldata = data;
2634         struct nfs4_state *state = calldata->state;
2635         struct nfs_server *server = NFS_SERVER(calldata->inode);
2636         nfs4_stateid *res_stateid = NULL;
2637
2638         dprintk("%s: begin!\n", __func__);
2639         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2640                 return;
2641         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2642         /* hmm. we are done with the inode, and in the process of freeing
2643          * the state_owner. we keep this around to process errors
2644          */
2645         switch (task->tk_status) {
2646                 case 0:
2647                         res_stateid = &calldata->res.stateid;
2648                         if (calldata->arg.fmode == 0 && calldata->roc)
2649                                 pnfs_roc_set_barrier(state->inode,
2650                                                      calldata->roc_barrier);
2651                         renew_lease(server, calldata->timestamp);
2652                         break;
2653                 case -NFS4ERR_ADMIN_REVOKED:
2654                 case -NFS4ERR_STALE_STATEID:
2655                 case -NFS4ERR_OLD_STATEID:
2656                 case -NFS4ERR_BAD_STATEID:
2657                 case -NFS4ERR_EXPIRED:
2658                         if (!nfs4_stateid_match(&calldata->arg.stateid,
2659                                                 &state->open_stateid)) {
2660                                 rpc_restart_call_prepare(task);
2661                                 goto out_release;
2662                         }
2663                         if (calldata->arg.fmode == 0)
2664                                 break;
2665                 default:
2666                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2667                                 rpc_restart_call_prepare(task);
2668                                 goto out_release;
2669                         }
2670         }
2671         nfs_clear_open_stateid(state, res_stateid, calldata->arg.fmode);
2672 out_release:
2673         nfs_release_seqid(calldata->arg.seqid);
2674         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2675         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2676 }
2677
2678 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2679 {
2680         struct nfs4_closedata *calldata = data;
2681         struct nfs4_state *state = calldata->state;
2682         struct inode *inode = calldata->inode;
2683         bool is_rdonly, is_wronly, is_rdwr;
2684         int call_close = 0;
2685
2686         dprintk("%s: begin!\n", __func__);
2687         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2688                 goto out_wait;
2689
2690         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2691         spin_lock(&state->owner->so_lock);
2692         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2693         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2694         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2695         nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
2696         /* Calculate the change in open mode */
2697         calldata->arg.fmode = 0;
2698         if (state->n_rdwr == 0) {
2699                 if (state->n_rdonly == 0)
2700                         call_close |= is_rdonly;
2701                 else if (is_rdonly)
2702                         calldata->arg.fmode |= FMODE_READ;
2703                 if (state->n_wronly == 0)
2704                         call_close |= is_wronly;
2705                 else if (is_wronly)
2706                         calldata->arg.fmode |= FMODE_WRITE;
2707         } else if (is_rdwr)
2708                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2709
2710         if (calldata->arg.fmode == 0)
2711                 call_close |= is_rdwr;
2712
2713         if (!nfs4_valid_open_stateid(state))
2714                 call_close = 0;
2715         spin_unlock(&state->owner->so_lock);
2716
2717         if (!call_close) {
2718                 /* Note: exit _without_ calling nfs4_close_done */
2719                 goto out_no_action;
2720         }
2721
2722         if (calldata->arg.fmode == 0) {
2723                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2724                 if (calldata->roc &&
2725                     pnfs_roc_drain(inode, &calldata->roc_barrier, task)) {
2726                         nfs_release_seqid(calldata->arg.seqid);
2727                         goto out_wait;
2728                     }
2729         }
2730         calldata->arg.share_access =
2731                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
2732                                 calldata->arg.fmode, 0);
2733
2734         nfs_fattr_init(calldata->res.fattr);
2735         calldata->timestamp = jiffies;
2736         if (nfs4_setup_sequence(NFS_SERVER(inode),
2737                                 &calldata->arg.seq_args,
2738                                 &calldata->res.seq_res,
2739                                 task) != 0)
2740                 nfs_release_seqid(calldata->arg.seqid);
2741         dprintk("%s: done!\n", __func__);
2742         return;
2743 out_no_action:
2744         task->tk_action = NULL;
2745 out_wait:
2746         nfs4_sequence_done(task, &calldata->res.seq_res);
2747 }
2748
2749 static const struct rpc_call_ops nfs4_close_ops = {
2750         .rpc_call_prepare = nfs4_close_prepare,
2751         .rpc_call_done = nfs4_close_done,
2752         .rpc_release = nfs4_free_closedata,
2753 };
2754
2755 static bool nfs4_roc(struct inode *inode)
2756 {
2757         if (!nfs_have_layout(inode))
2758                 return false;
2759         return pnfs_roc(inode);
2760 }
2761
2762 /*
2763  * It is possible for data to be read/written from a mem-mapped file
2764  * after the sys_close call (which hits the vfs layer as a flush).
2765  * This means that we can't safely call nfsv4 close on a file until
2766  * the inode is cleared. This in turn means that we are not good
2767  * NFSv4 citizens - we do not indicate to the server to update the file's
2768  * share state even when we are done with one of the three share
2769  * stateid's in the inode.
2770  *
2771  * NOTE: Caller must be holding the sp->so_owner semaphore!
2772  */
2773 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2774 {
2775         struct nfs_server *server = NFS_SERVER(state->inode);
2776         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
2777         struct nfs4_closedata *calldata;
2778         struct nfs4_state_owner *sp = state->owner;
2779         struct rpc_task *task;
2780         struct rpc_message msg = {
2781                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2782                 .rpc_cred = state->owner->so_cred,
2783         };
2784         struct rpc_task_setup task_setup_data = {
2785                 .rpc_client = server->client,
2786                 .rpc_message = &msg,
2787                 .callback_ops = &nfs4_close_ops,
2788                 .workqueue = nfsiod_workqueue,
2789                 .flags = RPC_TASK_ASYNC,
2790         };
2791         int status = -ENOMEM;
2792
2793         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2794                 &task_setup_data.rpc_client, &msg);
2795
2796         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2797         if (calldata == NULL)
2798                 goto out;
2799         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2800         calldata->inode = state->inode;
2801         calldata->state = state;
2802         calldata->arg.fh = NFS_FH(state->inode);
2803         /* Serialization for the sequence id */
2804         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
2805         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2806         if (IS_ERR(calldata->arg.seqid))
2807                 goto out_free_calldata;
2808         calldata->arg.fmode = 0;
2809         calldata->arg.bitmask = server->cache_consistency_bitmask;
2810         calldata->res.fattr = &calldata->fattr;
2811         calldata->res.seqid = calldata->arg.seqid;
2812         calldata->res.server = server;
2813         calldata->roc = nfs4_roc(state->inode);
2814         nfs_sb_active(calldata->inode->i_sb);
2815
2816         msg.rpc_argp = &calldata->arg;
2817         msg.rpc_resp = &calldata->res;
2818         task_setup_data.callback_data = calldata;
2819         task = rpc_run_task(&task_setup_data);
2820         if (IS_ERR(task))
2821                 return PTR_ERR(task);
2822         status = 0;
2823         if (wait)
2824                 status = rpc_wait_for_completion_task(task);
2825         rpc_put_task(task);
2826         return status;
2827 out_free_calldata:
2828         kfree(calldata);
2829 out:
2830         nfs4_put_open_state(state);
2831         nfs4_put_state_owner(sp);
2832         return status;
2833 }
2834
2835 static struct inode *
2836 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2837                 int open_flags, struct iattr *attr, int *opened)
2838 {
2839         struct nfs4_state *state;
2840         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2841
2842         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2843
2844         /* Protect against concurrent sillydeletes */
2845         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2846
2847         nfs4_label_release_security(label);
2848
2849         if (IS_ERR(state))
2850                 return ERR_CAST(state);
2851         return state->inode;
2852 }
2853
2854 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
2855 {
2856         if (ctx->state == NULL)
2857                 return;
2858         if (is_sync)
2859                 nfs4_close_sync(ctx->state, ctx->mode);
2860         else
2861                 nfs4_close_state(ctx->state, ctx->mode);
2862 }
2863
2864 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
2865 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
2866 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
2867
2868 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2869 {
2870         struct nfs4_server_caps_arg args = {
2871                 .fhandle = fhandle,
2872         };
2873         struct nfs4_server_caps_res res = {};
2874         struct rpc_message msg = {
2875                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
2876                 .rpc_argp = &args,
2877                 .rpc_resp = &res,
2878         };
2879         int status;
2880
2881         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2882         if (status == 0) {
2883                 /* Sanity check the server answers */
2884                 switch (server->nfs_client->cl_minorversion) {
2885                 case 0:
2886                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
2887                         res.attr_bitmask[2] = 0;
2888                         break;
2889                 case 1:
2890                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
2891                         break;
2892                 case 2:
2893                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
2894                 }
2895                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
2896                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
2897                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
2898                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
2899                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
2900                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
2901                                 NFS_CAP_SECURITY_LABEL);
2902                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
2903                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2904                         server->caps |= NFS_CAP_ACLS;
2905                 if (res.has_links != 0)
2906                         server->caps |= NFS_CAP_HARDLINKS;
2907                 if (res.has_symlinks != 0)
2908                         server->caps |= NFS_CAP_SYMLINKS;
2909                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
2910                         server->caps |= NFS_CAP_FILEID;
2911                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
2912                         server->caps |= NFS_CAP_MODE;
2913                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
2914                         server->caps |= NFS_CAP_NLINK;
2915                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
2916                         server->caps |= NFS_CAP_OWNER;
2917                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
2918                         server->caps |= NFS_CAP_OWNER_GROUP;
2919                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
2920                         server->caps |= NFS_CAP_ATIME;
2921                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
2922                         server->caps |= NFS_CAP_CTIME;
2923                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
2924                         server->caps |= NFS_CAP_MTIME;
2925 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
2926                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
2927                         server->caps |= NFS_CAP_SECURITY_LABEL;
2928 #endif
2929                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
2930                                 sizeof(server->attr_bitmask));
2931                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
2932
2933                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
2934                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
2935                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
2936                 server->cache_consistency_bitmask[2] = 0;
2937                 server->acl_bitmask = res.acl_bitmask;
2938                 server->fh_expire_type = res.fh_expire_type;
2939         }
2940
2941         return status;
2942 }
2943
2944 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
2945 {
2946         struct nfs4_exception exception = { };
2947         int err;
2948         do {
2949                 err = nfs4_handle_exception(server,
2950                                 _nfs4_server_capabilities(server, fhandle),
2951                                 &exception);
2952         } while (exception.retry);
2953         return err;
2954 }
2955
2956 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2957                 struct nfs_fsinfo *info)
2958 {
2959         u32 bitmask[3];
2960         struct nfs4_lookup_root_arg args = {
2961                 .bitmask = bitmask,
2962         };
2963         struct nfs4_lookup_res res = {
2964                 .server = server,
2965                 .fattr = info->fattr,
2966                 .fh = fhandle,
2967         };
2968         struct rpc_message msg = {
2969                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
2970                 .rpc_argp = &args,
2971                 .rpc_resp = &res,
2972         };
2973
2974         bitmask[0] = nfs4_fattr_bitmap[0];
2975         bitmask[1] = nfs4_fattr_bitmap[1];
2976         /*
2977          * Process the label in the upcoming getfattr
2978          */
2979         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
2980
2981         nfs_fattr_init(info->fattr);
2982         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
2983 }
2984
2985 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
2986                 struct nfs_fsinfo *info)
2987 {
2988         struct nfs4_exception exception = { };
2989         int err;
2990         do {
2991                 err = _nfs4_lookup_root(server, fhandle, info);
2992                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
2993                 switch (err) {
2994                 case 0:
2995                 case -NFS4ERR_WRONGSEC:
2996                         goto out;
2997                 default:
2998                         err = nfs4_handle_exception(server, err, &exception);
2999                 }
3000         } while (exception.retry);
3001 out:
3002         return err;
3003 }
3004
3005 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3006                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3007 {
3008         struct rpc_auth_create_args auth_args = {
3009                 .pseudoflavor = flavor,
3010         };
3011         struct rpc_auth *auth;
3012         int ret;
3013
3014         auth = rpcauth_create(&auth_args, server->client);
3015         if (IS_ERR(auth)) {
3016                 ret = -EACCES;
3017                 goto out;
3018         }
3019         ret = nfs4_lookup_root(server, fhandle, info);
3020 out:
3021         return ret;
3022 }
3023
3024 /*
3025  * Retry pseudoroot lookup with various security flavors.  We do this when:
3026  *
3027  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3028  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3029  *
3030  * Returns zero on success, or a negative NFS4ERR value, or a
3031  * negative errno value.
3032  */
3033 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3034                               struct nfs_fsinfo *info)
3035 {
3036         /* Per 3530bis 15.33.5 */
3037         static const rpc_authflavor_t flav_array[] = {
3038                 RPC_AUTH_GSS_KRB5P,
3039                 RPC_AUTH_GSS_KRB5I,
3040                 RPC_AUTH_GSS_KRB5,
3041                 RPC_AUTH_UNIX,                  /* courtesy */
3042                 RPC_AUTH_NULL,
3043         };
3044         int status = -EPERM;
3045         size_t i;
3046
3047         if (server->auth_info.flavor_len > 0) {
3048                 /* try each flavor specified by user */
3049                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3050                         status = nfs4_lookup_root_sec(server, fhandle, info,
3051                                                 server->auth_info.flavors[i]);
3052                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3053                                 continue;
3054                         break;
3055                 }
3056         } else {
3057                 /* no flavors specified by user, try default list */
3058                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3059                         status = nfs4_lookup_root_sec(server, fhandle, info,
3060                                                       flav_array[i]);
3061                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3062                                 continue;
3063                         break;
3064                 }
3065         }
3066
3067         /*
3068          * -EACCESS could mean that the user doesn't have correct permissions
3069          * to access the mount.  It could also mean that we tried to mount
3070          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3071          * existing mount programs don't handle -EACCES very well so it should
3072          * be mapped to -EPERM instead.
3073          */
3074         if (status == -EACCES)
3075                 status = -EPERM;
3076         return status;
3077 }
3078
3079 static int nfs4_do_find_root_sec(struct nfs_server *server,
3080                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3081 {
3082         int mv = server->nfs_client->cl_minorversion;
3083         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3084 }
3085
3086 /**
3087  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3088  * @server: initialized nfs_server handle
3089  * @fhandle: we fill in the pseudo-fs root file handle
3090  * @info: we fill in an FSINFO struct
3091  * @auth_probe: probe the auth flavours
3092  *
3093  * Returns zero on success, or a negative errno.
3094  */
3095 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3096                          struct nfs_fsinfo *info,
3097                          bool auth_probe)
3098 {
3099         int status = 0;
3100
3101         if (!auth_probe)
3102                 status = nfs4_lookup_root(server, fhandle, info);
3103
3104         if (auth_probe || status == NFS4ERR_WRONGSEC)
3105                 status = nfs4_do_find_root_sec(server, fhandle, info);
3106
3107         if (status == 0)
3108                 status = nfs4_server_capabilities(server, fhandle);
3109         if (status == 0)
3110                 status = nfs4_do_fsinfo(server, fhandle, info);
3111
3112         return nfs4_map_errors(status);
3113 }
3114
3115 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3116                               struct nfs_fsinfo *info)
3117 {
3118         int error;
3119         struct nfs_fattr *fattr = info->fattr;
3120         struct nfs4_label *label = NULL;
3121
3122         error = nfs4_server_capabilities(server, mntfh);
3123         if (error < 0) {
3124                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3125                 return error;
3126         }
3127
3128         label = nfs4_label_alloc(server, GFP_KERNEL);
3129         if (IS_ERR(label))
3130                 return PTR_ERR(label);
3131
3132         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3133         if (error < 0) {
3134                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3135                 goto err_free_label;
3136         }
3137
3138         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3139             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3140                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3141
3142 err_free_label:
3143         nfs4_label_free(label);
3144
3145         return error;
3146 }
3147
3148 /*
3149  * Get locations and (maybe) other attributes of a referral.
3150  * Note that we'll actually follow the referral later when
3151  * we detect fsid mismatch in inode revalidation
3152  */
3153 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3154                              const struct qstr *name, struct nfs_fattr *fattr,
3155                              struct nfs_fh *fhandle)
3156 {
3157         int status = -ENOMEM;
3158         struct page *page = NULL;
3159         struct nfs4_fs_locations *locations = NULL;
3160
3161         page = alloc_page(GFP_KERNEL);
3162         if (page == NULL)
3163                 goto out;
3164         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3165         if (locations == NULL)
3166                 goto out;
3167
3168         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3169         if (status != 0)
3170                 goto out;
3171
3172         /*
3173          * If the fsid didn't change, this is a migration event, not a
3174          * referral.  Cause us to drop into the exception handler, which
3175          * will kick off migration recovery.
3176          */
3177         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3178                 dprintk("%s: server did not return a different fsid for"
3179                         " a referral at %s\n", __func__, name->name);
3180                 status = -NFS4ERR_MOVED;
3181                 goto out;
3182         }
3183         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3184         nfs_fixup_referral_attributes(&locations->fattr);
3185
3186         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3187         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3188         memset(fhandle, 0, sizeof(struct nfs_fh));
3189 out:
3190         if (page)
3191                 __free_page(page);
3192         kfree(locations);
3193         return status;
3194 }
3195
3196 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3197                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3198 {
3199         struct nfs4_getattr_arg args = {
3200                 .fh = fhandle,
3201                 .bitmask = server->attr_bitmask,
3202         };
3203         struct nfs4_getattr_res res = {
3204                 .fattr = fattr,
3205                 .label = label,
3206                 .server = server,
3207         };
3208         struct rpc_message msg = {
3209                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3210                 .rpc_argp = &args,
3211                 .rpc_resp = &res,
3212         };
3213
3214         args.bitmask = nfs4_bitmask(server, label);
3215
3216         nfs_fattr_init(fattr);
3217         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3218 }
3219
3220 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3221                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3222 {
3223         struct nfs4_exception exception = { };
3224         int err;
3225         do {
3226                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3227                 trace_nfs4_getattr(server, fhandle, fattr, err);
3228                 err = nfs4_handle_exception(server, err,
3229                                 &exception);
3230         } while (exception.retry);
3231         return err;
3232 }
3233
3234 /*
3235  * The file is not closed if it is opened due to the a request to change
3236  * the size of the file. The open call will not be needed once the
3237  * VFS layer lookup-intents are implemented.
3238  *
3239  * Close is called when the inode is destroyed.
3240  * If we haven't opened the file for O_WRONLY, we
3241  * need to in the size_change case to obtain a stateid.
3242  *
3243  * Got race?
3244  * Because OPEN is always done by name in nfsv4, it is
3245  * possible that we opened a different file by the same
3246  * name.  We can recognize this race condition, but we
3247  * can't do anything about it besides returning an error.
3248  *
3249  * This will be fixed with VFS changes (lookup-intent).
3250  */
3251 static int
3252 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3253                   struct iattr *sattr)
3254 {
3255         struct inode *inode = d_inode(dentry);
3256         struct rpc_cred *cred = NULL;
3257         struct nfs4_state *state = NULL;
3258         struct nfs4_label *label = NULL;
3259         int status;
3260
3261         if (pnfs_ld_layoutret_on_setattr(inode) &&
3262             sattr->ia_valid & ATTR_SIZE &&
3263             sattr->ia_size < i_size_read(inode))
3264                 pnfs_commit_and_return_layout(inode);
3265
3266         nfs_fattr_init(fattr);
3267
3268         /* Deal with open(O_TRUNC) */
3269         if (sattr->ia_valid & ATTR_OPEN)
3270                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3271
3272         /* Optimization: if the end result is no change, don't RPC */
3273         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3274                 return 0;
3275
3276         /* Search for an existing open(O_WRITE) file */
3277         if (sattr->ia_valid & ATTR_FILE) {
3278                 struct nfs_open_context *ctx;
3279
3280                 ctx = nfs_file_open_context(sattr->ia_file);
3281                 if (ctx) {
3282                         cred = ctx->cred;
3283                         state = ctx->state;
3284                 }
3285         }
3286
3287         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3288         if (IS_ERR(label))
3289                 return PTR_ERR(label);
3290
3291         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3292         if (status == 0) {
3293                 nfs_setattr_update_inode(inode, sattr, fattr);
3294                 nfs_setsecurity(inode, fattr, label);
3295         }
3296         nfs4_label_free(label);
3297         return status;
3298 }
3299
3300 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3301                 const struct qstr *name, struct nfs_fh *fhandle,
3302                 struct nfs_fattr *fattr, struct nfs4_label *label)
3303 {
3304         struct nfs_server *server = NFS_SERVER(dir);
3305         int                    status;
3306         struct nfs4_lookup_arg args = {
3307                 .bitmask = server->attr_bitmask,
3308                 .dir_fh = NFS_FH(dir),
3309                 .name = name,
3310         };
3311         struct nfs4_lookup_res res = {
3312                 .server = server,
3313                 .fattr = fattr,
3314                 .label = label,
3315                 .fh = fhandle,
3316         };
3317         struct rpc_message msg = {
3318                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3319                 .rpc_argp = &args,
3320                 .rpc_resp = &res,
3321         };
3322
3323         args.bitmask = nfs4_bitmask(server, label);
3324
3325         nfs_fattr_init(fattr);
3326
3327         dprintk("NFS call  lookup %s\n", name->name);
3328         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3329         dprintk("NFS reply lookup: %d\n", status);
3330         return status;
3331 }
3332
3333 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3334 {
3335         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3336                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3337         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3338         fattr->nlink = 2;
3339 }
3340
3341 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3342                                    struct qstr *name, struct nfs_fh *fhandle,
3343                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3344 {
3345         struct nfs4_exception exception = { };
3346         struct rpc_clnt *client = *clnt;
3347         int err;
3348         do {
3349                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3350                 trace_nfs4_lookup(dir, name, err);
3351                 switch (err) {
3352                 case -NFS4ERR_BADNAME:
3353                         err = -ENOENT;
3354                         goto out;
3355                 case -NFS4ERR_MOVED:
3356                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3357                         goto out;
3358                 case -NFS4ERR_WRONGSEC:
3359                         err = -EPERM;
3360                         if (client != *clnt)
3361                                 goto out;
3362                         client = nfs4_negotiate_security(client, dir, name);
3363                         if (IS_ERR(client))
3364                                 return PTR_ERR(client);
3365
3366                         exception.retry = 1;
3367                         break;
3368                 default:
3369                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3370                 }
3371         } while (exception.retry);
3372
3373 out:
3374         if (err == 0)
3375                 *clnt = client;
3376         else if (client != *clnt)
3377                 rpc_shutdown_client(client);
3378
3379         return err;
3380 }
3381
3382 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3383                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3384                             struct nfs4_label *label)
3385 {
3386         int status;
3387         struct rpc_clnt *client = NFS_CLIENT(dir);
3388
3389         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3390         if (client != NFS_CLIENT(dir)) {
3391                 rpc_shutdown_client(client);
3392                 nfs_fixup_secinfo_attributes(fattr);
3393         }
3394         return status;
3395 }
3396
3397 struct rpc_clnt *
3398 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3399                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3400 {
3401         struct rpc_clnt *client = NFS_CLIENT(dir);
3402         int status;
3403
3404         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3405         if (status < 0)
3406                 return ERR_PTR(status);
3407         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3408 }
3409
3410 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3411 {
3412         struct nfs_server *server = NFS_SERVER(inode);
3413         struct nfs4_accessargs args = {
3414                 .fh = NFS_FH(inode),
3415                 .bitmask = server->cache_consistency_bitmask,
3416         };
3417         struct nfs4_accessres res = {
3418                 .server = server,
3419         };
3420         struct rpc_message msg = {
3421                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3422                 .rpc_argp = &args,
3423                 .rpc_resp = &res,
3424                 .rpc_cred = entry->cred,
3425         };
3426         int mode = entry->mask;
3427         int status = 0;
3428
3429         /*
3430          * Determine which access bits we want to ask for...
3431          */
3432         if (mode & MAY_READ)
3433                 args.access |= NFS4_ACCESS_READ;
3434         if (S_ISDIR(inode->i_mode)) {
3435                 if (mode & MAY_WRITE)
3436                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3437                 if (mode & MAY_EXEC)
3438                         args.access |= NFS4_ACCESS_LOOKUP;
3439         } else {
3440                 if (mode & MAY_WRITE)
3441                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3442                 if (mode & MAY_EXEC)
3443                         args.access |= NFS4_ACCESS_EXECUTE;
3444         }
3445
3446         res.fattr = nfs_alloc_fattr();
3447         if (res.fattr == NULL)
3448                 return -ENOMEM;
3449
3450         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3451         if (!status) {
3452                 nfs_access_set_mask(entry, res.access);
3453                 nfs_refresh_inode(inode, res.fattr);
3454         }
3455         nfs_free_fattr(res.fattr);
3456         return status;
3457 }
3458
3459 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3460 {
3461         struct nfs4_exception exception = { };
3462         int err;
3463         do {
3464                 err = _nfs4_proc_access(inode, entry);
3465                 trace_nfs4_access(inode, err);
3466                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3467                                 &exception);
3468         } while (exception.retry);
3469         return err;
3470 }
3471
3472 /*
3473  * TODO: For the time being, we don't try to get any attributes
3474  * along with any of the zero-copy operations READ, READDIR,
3475  * READLINK, WRITE.
3476  *
3477  * In the case of the first three, we want to put the GETATTR
3478  * after the read-type operation -- this is because it is hard
3479  * to predict the length of a GETATTR response in v4, and thus
3480  * align the READ data correctly.  This means that the GETATTR
3481  * may end up partially falling into the page cache, and we should
3482  * shift it into the 'tail' of the xdr_buf before processing.
3483  * To do this efficiently, we need to know the total length
3484  * of data received, which doesn't seem to be available outside
3485  * of the RPC layer.
3486  *
3487  * In the case of WRITE, we also want to put the GETATTR after
3488  * the operation -- in this case because we want to make sure
3489  * we get the post-operation mtime and size.
3490  *
3491  * Both of these changes to the XDR layer would in fact be quite
3492  * minor, but I decided to leave them for a subsequent patch.
3493  */
3494 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3495                 unsigned int pgbase, unsigned int pglen)
3496 {
3497         struct nfs4_readlink args = {
3498                 .fh       = NFS_FH(inode),
3499                 .pgbase   = pgbase,
3500                 .pglen    = pglen,
3501                 .pages    = &page,
3502         };
3503         struct nfs4_readlink_res res;
3504         struct rpc_message msg = {
3505                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3506                 .rpc_argp = &args,
3507                 .rpc_resp = &res,
3508         };
3509
3510         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3511 }
3512
3513 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3514                 unsigned int pgbase, unsigned int pglen)
3515 {
3516         struct nfs4_exception exception = { };
3517         int err;
3518         do {
3519                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3520                 trace_nfs4_readlink(inode, err);
3521                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3522                                 &exception);
3523         } while (exception.retry);
3524         return err;
3525 }
3526
3527 /*
3528  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3529  */
3530 static int
3531 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3532                  int flags)
3533 {
3534         struct nfs4_label l, *ilabel = NULL;
3535         struct nfs_open_context *ctx;
3536         struct nfs4_state *state;
3537         int opened = 0;
3538         int status = 0;
3539
3540         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3541         if (IS_ERR(ctx))
3542                 return PTR_ERR(ctx);
3543
3544         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3545
3546         sattr->ia_mode &= ~current_umask();
3547         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, &opened);
3548         if (IS_ERR(state)) {
3549                 status = PTR_ERR(state);
3550                 goto out;
3551         }
3552 out:
3553         nfs4_label_release_security(ilabel);
3554         put_nfs_open_context(ctx);
3555         return status;
3556 }
3557
3558 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3559 {
3560         struct nfs_server *server = NFS_SERVER(dir);
3561         struct nfs_removeargs args = {
3562                 .fh = NFS_FH(dir),
3563                 .name = *name,
3564         };
3565         struct nfs_removeres res = {
3566                 .server = server,
3567         };
3568         struct rpc_message msg = {
3569                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3570                 .rpc_argp = &args,
3571                 .rpc_resp = &res,
3572         };
3573         int status;
3574
3575         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3576         if (status == 0)
3577                 update_changeattr(dir, &res.cinfo);
3578         return status;
3579 }
3580
3581 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3582 {
3583         struct nfs4_exception exception = { };
3584         int err;
3585         do {
3586                 err = _nfs4_proc_remove(dir, name);
3587                 trace_nfs4_remove(dir, name, err);
3588                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3589                                 &exception);
3590         } while (exception.retry);
3591         return err;
3592 }
3593
3594 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3595 {
3596         struct nfs_server *server = NFS_SERVER(dir);
3597         struct nfs_removeargs *args = msg->rpc_argp;
3598         struct nfs_removeres *res = msg->rpc_resp;
3599
3600         res->server = server;
3601         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3602         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3603
3604         nfs_fattr_init(res->dir_attr);
3605 }
3606
3607 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3608 {
3609         nfs4_setup_sequence(NFS_SERVER(data->dir),
3610                         &data->args.seq_args,
3611                         &data->res.seq_res,
3612                         task);
3613 }
3614
3615 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3616 {
3617         struct nfs_unlinkdata *data = task->tk_calldata;
3618         struct nfs_removeres *res = &data->res;
3619
3620         if (!nfs4_sequence_done(task, &res->seq_res))
3621                 return 0;
3622         if (nfs4_async_handle_error(task, res->server, NULL,
3623                                     &data->timeout) == -EAGAIN)
3624                 return 0;
3625         update_changeattr(dir, &res->cinfo);
3626         return 1;
3627 }
3628
3629 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3630 {
3631         struct nfs_server *server = NFS_SERVER(dir);
3632         struct nfs_renameargs *arg = msg->rpc_argp;
3633         struct nfs_renameres *res = msg->rpc_resp;
3634
3635         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3636         res->server = server;
3637         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3638 }
3639
3640 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3641 {
3642         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3643                         &data->args.seq_args,
3644                         &data->res.seq_res,
3645                         task);
3646 }
3647
3648 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3649                                  struct inode *new_dir)
3650 {
3651         struct nfs_renamedata *data = task->tk_calldata;
3652         struct nfs_renameres *res = &data->res;
3653
3654         if (!nfs4_sequence_done(task, &res->seq_res))
3655                 return 0;
3656         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3657                 return 0;
3658
3659         update_changeattr(old_dir, &res->old_cinfo);
3660         update_changeattr(new_dir, &res->new_cinfo);
3661         return 1;
3662 }
3663
3664 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3665 {
3666         struct nfs_server *server = NFS_SERVER(inode);
3667         struct nfs4_link_arg arg = {
3668                 .fh     = NFS_FH(inode),
3669                 .dir_fh = NFS_FH(dir),
3670                 .name   = name,
3671                 .bitmask = server->attr_bitmask,
3672         };
3673         struct nfs4_link_res res = {
3674                 .server = server,
3675                 .label = NULL,
3676         };
3677         struct rpc_message msg = {
3678                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3679                 .rpc_argp = &arg,
3680                 .rpc_resp = &res,
3681         };
3682         int status = -ENOMEM;
3683
3684         res.fattr = nfs_alloc_fattr();
3685         if (res.fattr == NULL)
3686                 goto out;
3687
3688         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3689         if (IS_ERR(res.label)) {
3690                 status = PTR_ERR(res.label);
3691                 goto out;
3692         }
3693         arg.bitmask = nfs4_bitmask(server, res.label);
3694
3695         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3696         if (!status) {
3697                 update_changeattr(dir, &res.cinfo);
3698                 status = nfs_post_op_update_inode(inode, res.fattr);
3699                 if (!status)
3700                         nfs_setsecurity(inode, res.fattr, res.label);
3701         }
3702
3703
3704         nfs4_label_free(res.label);
3705
3706 out:
3707         nfs_free_fattr(res.fattr);
3708         return status;
3709 }
3710
3711 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3712 {
3713         struct nfs4_exception exception = { };
3714         int err;
3715         do {
3716                 err = nfs4_handle_exception(NFS_SERVER(inode),
3717                                 _nfs4_proc_link(inode, dir, name),
3718                                 &exception);
3719         } while (exception.retry);
3720         return err;
3721 }
3722
3723 struct nfs4_createdata {
3724         struct rpc_message msg;
3725         struct nfs4_create_arg arg;
3726         struct nfs4_create_res res;
3727         struct nfs_fh fh;
3728         struct nfs_fattr fattr;
3729         struct nfs4_label *label;
3730 };
3731
3732 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3733                 struct qstr *name, struct iattr *sattr, u32 ftype)
3734 {
3735         struct nfs4_createdata *data;
3736
3737         data = kzalloc(sizeof(*data), GFP_KERNEL);
3738         if (data != NULL) {
3739                 struct nfs_server *server = NFS_SERVER(dir);
3740
3741                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3742                 if (IS_ERR(data->label))
3743                         goto out_free;
3744
3745                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3746                 data->msg.rpc_argp = &data->arg;
3747                 data->msg.rpc_resp = &data->res;
3748                 data->arg.dir_fh = NFS_FH(dir);
3749                 data->arg.server = server;
3750                 data->arg.name = name;
3751                 data->arg.attrs = sattr;
3752                 data->arg.ftype = ftype;
3753                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3754                 data->res.server = server;
3755                 data->res.fh = &data->fh;
3756                 data->res.fattr = &data->fattr;
3757                 data->res.label = data->label;
3758                 nfs_fattr_init(data->res.fattr);
3759         }
3760         return data;
3761 out_free:
3762         kfree(data);
3763         return NULL;
3764 }
3765
3766 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3767 {
3768         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3769                                     &data->arg.seq_args, &data->res.seq_res, 1);
3770         if (status == 0) {
3771                 update_changeattr(dir, &data->res.dir_cinfo);
3772                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3773         }
3774         return status;
3775 }
3776
3777 static void nfs4_free_createdata(struct nfs4_createdata *data)
3778 {
3779         nfs4_label_free(data->label);
3780         kfree(data);
3781 }
3782
3783 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3784                 struct page *page, unsigned int len, struct iattr *sattr,
3785                 struct nfs4_label *label)
3786 {
3787         struct nfs4_createdata *data;
3788         int status = -ENAMETOOLONG;
3789
3790         if (len > NFS4_MAXPATHLEN)
3791                 goto out;
3792
3793         status = -ENOMEM;
3794         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3795         if (data == NULL)
3796                 goto out;
3797
3798         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3799         data->arg.u.symlink.pages = &page;
3800         data->arg.u.symlink.len = len;
3801         data->arg.label = label;
3802
3803         status = nfs4_do_create(dir, dentry, data);
3804
3805         nfs4_free_createdata(data);
3806 out:
3807         return status;
3808 }
3809
3810 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3811                 struct page *page, unsigned int len, struct iattr *sattr)
3812 {
3813         struct nfs4_exception exception = { };
3814         struct nfs4_label l, *label = NULL;
3815         int err;
3816
3817         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3818
3819         do {
3820                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3821                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3822                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3823                                 &exception);
3824         } while (exception.retry);
3825
3826         nfs4_label_release_security(label);
3827         return err;
3828 }
3829
3830 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3831                 struct iattr *sattr, struct nfs4_label *label)
3832 {
3833         struct nfs4_createdata *data;
3834         int status = -ENOMEM;
3835
3836         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
3837         if (data == NULL)
3838                 goto out;
3839
3840         data->arg.label = label;
3841         status = nfs4_do_create(dir, dentry, data);
3842
3843         nfs4_free_createdata(data);
3844 out:
3845         return status;
3846 }
3847
3848 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3849                 struct iattr *sattr)
3850 {
3851         struct nfs4_exception exception = { };
3852         struct nfs4_label l, *label = NULL;
3853         int err;
3854
3855         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3856
3857         sattr->ia_mode &= ~current_umask();
3858         do {
3859                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
3860                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
3861                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3862                                 &exception);
3863         } while (exception.retry);
3864         nfs4_label_release_security(label);
3865
3866         return err;
3867 }
3868
3869 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3870                 u64 cookie, struct page **pages, unsigned int count, int plus)
3871 {
3872         struct inode            *dir = d_inode(dentry);
3873         struct nfs4_readdir_arg args = {
3874                 .fh = NFS_FH(dir),
3875                 .pages = pages,
3876                 .pgbase = 0,
3877                 .count = count,
3878                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
3879                 .plus = plus,
3880         };
3881         struct nfs4_readdir_res res;
3882         struct rpc_message msg = {
3883                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
3884                 .rpc_argp = &args,
3885                 .rpc_resp = &res,
3886                 .rpc_cred = cred,
3887         };
3888         int                     status;
3889
3890         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
3891                         dentry,
3892                         (unsigned long long)cookie);
3893         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
3894         res.pgbase = args.pgbase;
3895         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
3896         if (status >= 0) {
3897                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
3898                 status += args.pgbase;
3899         }
3900
3901         nfs_invalidate_atime(dir);
3902
3903         dprintk("%s: returns %d\n", __func__, status);
3904         return status;
3905 }
3906
3907 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
3908                 u64 cookie, struct page **pages, unsigned int count, int plus)
3909 {
3910         struct nfs4_exception exception = { };
3911         int err;
3912         do {
3913                 err = _nfs4_proc_readdir(dentry, cred, cookie,
3914                                 pages, count, plus);
3915                 trace_nfs4_readdir(d_inode(dentry), err);
3916                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
3917                                 &exception);
3918         } while (exception.retry);
3919         return err;
3920 }
3921
3922 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3923                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
3924 {
3925         struct nfs4_createdata *data;
3926         int mode = sattr->ia_mode;
3927         int status = -ENOMEM;
3928
3929         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
3930         if (data == NULL)
3931                 goto out;
3932
3933         if (S_ISFIFO(mode))
3934                 data->arg.ftype = NF4FIFO;
3935         else if (S_ISBLK(mode)) {
3936                 data->arg.ftype = NF4BLK;
3937                 data->arg.u.device.specdata1 = MAJOR(rdev);
3938                 data->arg.u.device.specdata2 = MINOR(rdev);
3939         }
3940         else if (S_ISCHR(mode)) {
3941                 data->arg.ftype = NF4CHR;
3942                 data->arg.u.device.specdata1 = MAJOR(rdev);
3943                 data->arg.u.device.specdata2 = MINOR(rdev);
3944         } else if (!S_ISSOCK(mode)) {
3945                 status = -EINVAL;
3946                 goto out_free;
3947         }
3948
3949         data->arg.label = label;
3950         status = nfs4_do_create(dir, dentry, data);
3951 out_free:
3952         nfs4_free_createdata(data);
3953 out:
3954         return status;
3955 }
3956
3957 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
3958                 struct iattr *sattr, dev_t rdev)
3959 {
3960         struct nfs4_exception exception = { };
3961         struct nfs4_label l, *label = NULL;
3962         int err;
3963
3964         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3965
3966         sattr->ia_mode &= ~current_umask();
3967         do {
3968                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
3969                 trace_nfs4_mknod(dir, &dentry->d_name, err);
3970                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3971                                 &exception);
3972         } while (exception.retry);
3973
3974         nfs4_label_release_security(label);
3975
3976         return err;
3977 }
3978
3979 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
3980                  struct nfs_fsstat *fsstat)
3981 {
3982         struct nfs4_statfs_arg args = {
3983                 .fh = fhandle,
3984                 .bitmask = server->attr_bitmask,
3985         };
3986         struct nfs4_statfs_res res = {
3987                 .fsstat = fsstat,
3988         };
3989         struct rpc_message msg = {
3990                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
3991                 .rpc_argp = &args,
3992                 .rpc_resp = &res,
3993         };
3994
3995         nfs_fattr_init(fsstat->fattr);
3996         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3997 }
3998
3999 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4000 {
4001         struct nfs4_exception exception = { };
4002         int err;
4003         do {
4004                 err = nfs4_handle_exception(server,
4005                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4006                                 &exception);
4007         } while (exception.retry);
4008         return err;
4009 }
4010
4011 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4012                 struct nfs_fsinfo *fsinfo)
4013 {
4014         struct nfs4_fsinfo_arg args = {
4015                 .fh = fhandle,
4016                 .bitmask = server->attr_bitmask,
4017         };
4018         struct nfs4_fsinfo_res res = {
4019                 .fsinfo = fsinfo,
4020         };
4021         struct rpc_message msg = {
4022                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4023                 .rpc_argp = &args,
4024                 .rpc_resp = &res,
4025         };
4026
4027         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4028 }
4029
4030 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4031 {
4032         struct nfs4_exception exception = { };
4033         unsigned long now = jiffies;
4034         int err;
4035
4036         do {
4037                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4038                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4039                 if (err == 0) {
4040                         struct nfs_client *clp = server->nfs_client;
4041
4042                         spin_lock(&clp->cl_lock);
4043                         clp->cl_lease_time = fsinfo->lease_time * HZ;
4044                         clp->cl_last_renewal = now;
4045                         spin_unlock(&clp->cl_lock);
4046                         break;
4047                 }
4048                 err = nfs4_handle_exception(server, err, &exception);
4049         } while (exception.retry);
4050         return err;
4051 }
4052
4053 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4054 {
4055         int error;
4056
4057         nfs_fattr_init(fsinfo->fattr);
4058         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4059         if (error == 0) {
4060                 /* block layout checks this! */
4061                 server->pnfs_blksize = fsinfo->blksize;
4062                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4063         }
4064
4065         return error;
4066 }
4067
4068 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4069                 struct nfs_pathconf *pathconf)
4070 {
4071         struct nfs4_pathconf_arg args = {
4072                 .fh = fhandle,
4073                 .bitmask = server->attr_bitmask,
4074         };
4075         struct nfs4_pathconf_res res = {
4076                 .pathconf = pathconf,
4077         };
4078         struct rpc_message msg = {
4079                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4080                 .rpc_argp = &args,
4081                 .rpc_resp = &res,
4082         };
4083
4084         /* None of the pathconf attributes are mandatory to implement */
4085         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4086                 memset(pathconf, 0, sizeof(*pathconf));
4087                 return 0;
4088         }
4089
4090         nfs_fattr_init(pathconf->fattr);
4091         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4092 }
4093
4094 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4095                 struct nfs_pathconf *pathconf)
4096 {
4097         struct nfs4_exception exception = { };
4098         int err;
4099
4100         do {
4101                 err = nfs4_handle_exception(server,
4102                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4103                                 &exception);
4104         } while (exception.retry);
4105         return err;
4106 }
4107
4108 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4109                 const struct nfs_open_context *ctx,
4110                 const struct nfs_lock_context *l_ctx,
4111                 fmode_t fmode)
4112 {
4113         const struct nfs_lockowner *lockowner = NULL;
4114
4115         if (l_ctx != NULL)
4116                 lockowner = &l_ctx->lockowner;
4117         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4118 }
4119 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4120
4121 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4122                 const struct nfs_open_context *ctx,
4123                 const struct nfs_lock_context *l_ctx,
4124                 fmode_t fmode)
4125 {
4126         nfs4_stateid current_stateid;
4127
4128         /* If the current stateid represents a lost lock, then exit */
4129         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4130                 return true;
4131         return nfs4_stateid_match(stateid, &current_stateid);
4132 }
4133
4134 static bool nfs4_error_stateid_expired(int err)
4135 {
4136         switch (err) {
4137         case -NFS4ERR_DELEG_REVOKED:
4138         case -NFS4ERR_ADMIN_REVOKED:
4139         case -NFS4ERR_BAD_STATEID:
4140         case -NFS4ERR_STALE_STATEID:
4141         case -NFS4ERR_OLD_STATEID:
4142         case -NFS4ERR_OPENMODE:
4143         case -NFS4ERR_EXPIRED:
4144                 return true;
4145         }
4146         return false;
4147 }
4148
4149 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4150 {
4151         nfs_invalidate_atime(hdr->inode);
4152 }
4153
4154 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4155 {
4156         struct nfs_server *server = NFS_SERVER(hdr->inode);
4157
4158         trace_nfs4_read(hdr, task->tk_status);
4159         if (nfs4_async_handle_error(task, server,
4160                                     hdr->args.context->state,
4161                                     NULL) == -EAGAIN) {
4162                 rpc_restart_call_prepare(task);
4163                 return -EAGAIN;
4164         }
4165
4166         __nfs4_read_done_cb(hdr);
4167         if (task->tk_status > 0)
4168                 renew_lease(server, hdr->timestamp);
4169         return 0;
4170 }
4171
4172 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4173                 struct nfs_pgio_args *args)
4174 {
4175
4176         if (!nfs4_error_stateid_expired(task->tk_status) ||
4177                 nfs4_stateid_is_current(&args->stateid,
4178                                 args->context,
4179                                 args->lock_context,
4180                                 FMODE_READ))
4181                 return false;
4182         rpc_restart_call_prepare(task);
4183         return true;
4184 }
4185
4186 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4187 {
4188
4189         dprintk("--> %s\n", __func__);
4190
4191         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4192                 return -EAGAIN;
4193         if (nfs4_read_stateid_changed(task, &hdr->args))
4194                 return -EAGAIN;
4195         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4196                                     nfs4_read_done_cb(task, hdr);
4197 }
4198
4199 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4200                                  struct rpc_message *msg)
4201 {
4202         hdr->timestamp   = jiffies;
4203         hdr->pgio_done_cb = nfs4_read_done_cb;
4204         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4205         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4206 }
4207
4208 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4209                                       struct nfs_pgio_header *hdr)
4210 {
4211         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4212                         &hdr->args.seq_args,
4213                         &hdr->res.seq_res,
4214                         task))
4215                 return 0;
4216         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4217                                 hdr->args.lock_context,
4218                                 hdr->rw_ops->rw_mode) == -EIO)
4219                 return -EIO;
4220         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4221                 return -EIO;
4222         return 0;
4223 }
4224
4225 static int nfs4_write_done_cb(struct rpc_task *task,
4226                               struct nfs_pgio_header *hdr)
4227 {
4228         struct inode *inode = hdr->inode;
4229
4230         trace_nfs4_write(hdr, task->tk_status);
4231         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4232                                     hdr->args.context->state,
4233                                     NULL) == -EAGAIN) {
4234                 rpc_restart_call_prepare(task);
4235                 return -EAGAIN;
4236         }
4237         if (task->tk_status >= 0) {
4238                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4239                 nfs_writeback_update_inode(hdr);
4240         }
4241         return 0;
4242 }
4243
4244 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4245                 struct nfs_pgio_args *args)
4246 {
4247
4248         if (!nfs4_error_stateid_expired(task->tk_status) ||
4249                 nfs4_stateid_is_current(&args->stateid,
4250                                 args->context,
4251                                 args->lock_context,
4252                                 FMODE_WRITE))
4253                 return false;
4254         rpc_restart_call_prepare(task);
4255         return true;
4256 }
4257
4258 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4259 {
4260         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4261                 return -EAGAIN;
4262         if (nfs4_write_stateid_changed(task, &hdr->args))
4263                 return -EAGAIN;
4264         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4265                 nfs4_write_done_cb(task, hdr);
4266 }
4267
4268 static
4269 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4270 {
4271         /* Don't request attributes for pNFS or O_DIRECT writes */
4272         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4273                 return false;
4274         /* Otherwise, request attributes if and only if we don't hold
4275          * a delegation
4276          */
4277         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4278 }
4279
4280 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4281                                   struct rpc_message *msg)
4282 {
4283         struct nfs_server *server = NFS_SERVER(hdr->inode);
4284
4285         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4286                 hdr->args.bitmask = NULL;
4287                 hdr->res.fattr = NULL;
4288         } else
4289                 hdr->args.bitmask = server->cache_consistency_bitmask;
4290
4291         if (!hdr->pgio_done_cb)
4292                 hdr->pgio_done_cb = nfs4_write_done_cb;
4293         hdr->res.server = server;
4294         hdr->timestamp   = jiffies;
4295
4296         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4297         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4298 }
4299
4300 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4301 {
4302         nfs4_setup_sequence(NFS_SERVER(data->inode),
4303                         &data->args.seq_args,
4304                         &data->res.seq_res,
4305                         task);
4306 }
4307
4308 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4309 {
4310         struct inode *inode = data->inode;
4311
4312         trace_nfs4_commit(data, task->tk_status);
4313         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4314                                     NULL, NULL) == -EAGAIN) {
4315                 rpc_restart_call_prepare(task);
4316                 return -EAGAIN;
4317         }
4318         return 0;
4319 }
4320
4321 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4322 {
4323         if (!nfs4_sequence_done(task, &data->res.seq_res))
4324                 return -EAGAIN;
4325         return data->commit_done_cb(task, data);
4326 }
4327
4328 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4329 {
4330         struct nfs_server *server = NFS_SERVER(data->inode);
4331
4332         if (data->commit_done_cb == NULL)
4333                 data->commit_done_cb = nfs4_commit_done_cb;
4334         data->res.server = server;
4335         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4336         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4337 }
4338
4339 struct nfs4_renewdata {
4340         struct nfs_client       *client;
4341         unsigned long           timestamp;
4342 };
4343
4344 /*
4345  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4346  * standalone procedure for queueing an asynchronous RENEW.
4347  */
4348 static void nfs4_renew_release(void *calldata)
4349 {
4350         struct nfs4_renewdata *data = calldata;
4351         struct nfs_client *clp = data->client;
4352
4353         if (atomic_read(&clp->cl_count) > 1)
4354                 nfs4_schedule_state_renewal(clp);
4355         nfs_put_client(clp);
4356         kfree(data);
4357 }
4358
4359 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4360 {
4361         struct nfs4_renewdata *data = calldata;
4362         struct nfs_client *clp = data->client;
4363         unsigned long timestamp = data->timestamp;
4364
4365         trace_nfs4_renew_async(clp, task->tk_status);
4366         switch (task->tk_status) {
4367         case 0:
4368                 break;
4369         case -NFS4ERR_LEASE_MOVED:
4370                 nfs4_schedule_lease_moved_recovery(clp);
4371                 break;
4372         default:
4373                 /* Unless we're shutting down, schedule state recovery! */
4374                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4375                         return;
4376                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4377                         nfs4_schedule_lease_recovery(clp);
4378                         return;
4379                 }
4380                 nfs4_schedule_path_down_recovery(clp);
4381         }
4382         do_renew_lease(clp, timestamp);
4383 }
4384
4385 static const struct rpc_call_ops nfs4_renew_ops = {
4386         .rpc_call_done = nfs4_renew_done,
4387         .rpc_release = nfs4_renew_release,
4388 };
4389
4390 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4391 {
4392         struct rpc_message msg = {
4393                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4394                 .rpc_argp       = clp,
4395                 .rpc_cred       = cred,
4396         };
4397         struct nfs4_renewdata *data;
4398
4399         if (renew_flags == 0)
4400                 return 0;
4401         if (!atomic_inc_not_zero(&clp->cl_count))
4402                 return -EIO;
4403         data = kmalloc(sizeof(*data), GFP_NOFS);
4404         if (data == NULL)
4405                 return -ENOMEM;
4406         data->client = clp;
4407         data->timestamp = jiffies;
4408         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4409                         &nfs4_renew_ops, data);
4410 }
4411
4412 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4413 {
4414         struct rpc_message msg = {
4415                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4416                 .rpc_argp       = clp,
4417                 .rpc_cred       = cred,
4418         };
4419         unsigned long now = jiffies;
4420         int status;
4421
4422         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4423         if (status < 0)
4424                 return status;
4425         do_renew_lease(clp, now);
4426         return 0;
4427 }
4428
4429 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4430 {
4431         return server->caps & NFS_CAP_ACLS;
4432 }
4433
4434 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4435  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4436  * the stack.
4437  */
4438 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4439
4440 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4441                 struct page **pages, unsigned int *pgbase)
4442 {
4443         struct page *newpage, **spages;
4444         int rc = 0;
4445         size_t len;
4446         spages = pages;
4447
4448         do {
4449                 len = min_t(size_t, PAGE_SIZE, buflen);
4450                 newpage = alloc_page(GFP_KERNEL);
4451
4452                 if (newpage == NULL)
4453                         goto unwind;
4454                 memcpy(page_address(newpage), buf, len);
4455                 buf += len;
4456                 buflen -= len;
4457                 *pages++ = newpage;
4458                 rc++;
4459         } while (buflen != 0);
4460
4461         return rc;
4462
4463 unwind:
4464         for(; rc > 0; rc--)
4465                 __free_page(spages[rc-1]);
4466         return -ENOMEM;
4467 }
4468
4469 struct nfs4_cached_acl {
4470         int cached;
4471         size_t len;
4472         char data[0];
4473 };
4474
4475 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4476 {
4477         struct nfs_inode *nfsi = NFS_I(inode);
4478
4479         spin_lock(&inode->i_lock);
4480         kfree(nfsi->nfs4_acl);
4481         nfsi->nfs4_acl = acl;
4482         spin_unlock(&inode->i_lock);
4483 }
4484
4485 static void nfs4_zap_acl_attr(struct inode *inode)
4486 {
4487         nfs4_set_cached_acl(inode, NULL);
4488 }
4489
4490 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4491 {
4492         struct nfs_inode *nfsi = NFS_I(inode);
4493         struct nfs4_cached_acl *acl;
4494         int ret = -ENOENT;
4495
4496         spin_lock(&inode->i_lock);
4497         acl = nfsi->nfs4_acl;
4498         if (acl == NULL)
4499                 goto out;
4500         if (buf == NULL) /* user is just asking for length */
4501                 goto out_len;
4502         if (acl->cached == 0)
4503                 goto out;
4504         ret = -ERANGE; /* see getxattr(2) man page */
4505         if (acl->len > buflen)
4506                 goto out;
4507         memcpy(buf, acl->data, acl->len);
4508 out_len:
4509         ret = acl->len;
4510 out:
4511         spin_unlock(&inode->i_lock);
4512         return ret;
4513 }
4514
4515 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4516 {
4517         struct nfs4_cached_acl *acl;
4518         size_t buflen = sizeof(*acl) + acl_len;
4519
4520         if (buflen <= PAGE_SIZE) {
4521                 acl = kmalloc(buflen, GFP_KERNEL);
4522                 if (acl == NULL)
4523                         goto out;
4524                 acl->cached = 1;
4525                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4526         } else {
4527                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4528                 if (acl == NULL)
4529                         goto out;
4530                 acl->cached = 0;
4531         }
4532         acl->len = acl_len;
4533 out:
4534         nfs4_set_cached_acl(inode, acl);
4535 }
4536
4537 /*
4538  * The getxattr API returns the required buffer length when called with a
4539  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4540  * the required buf.  On a NULL buf, we send a page of data to the server
4541  * guessing that the ACL request can be serviced by a page. If so, we cache
4542  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4543  * the cache. If not so, we throw away the page, and cache the required
4544  * length. The next getxattr call will then produce another round trip to
4545  * the server, this time with the input buf of the required size.
4546  */
4547 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4548 {
4549         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4550         struct nfs_getaclargs args = {
4551                 .fh = NFS_FH(inode),
4552                 .acl_pages = pages,
4553                 .acl_len = buflen,
4554         };
4555         struct nfs_getaclres res = {
4556                 .acl_len = buflen,
4557         };
4558         struct rpc_message msg = {
4559                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4560                 .rpc_argp = &args,
4561                 .rpc_resp = &res,
4562         };
4563         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4564         int ret = -ENOMEM, i;
4565
4566         /* As long as we're doing a round trip to the server anyway,
4567          * let's be prepared for a page of acl data. */
4568         if (npages == 0)
4569                 npages = 1;
4570         if (npages > ARRAY_SIZE(pages))
4571                 return -ERANGE;
4572
4573         for (i = 0; i < npages; i++) {
4574                 pages[i] = alloc_page(GFP_KERNEL);
4575                 if (!pages[i])
4576                         goto out_free;
4577         }
4578
4579         /* for decoding across pages */
4580         res.acl_scratch = alloc_page(GFP_KERNEL);
4581         if (!res.acl_scratch)
4582                 goto out_free;
4583
4584         args.acl_len = npages * PAGE_SIZE;
4585         args.acl_pgbase = 0;
4586
4587         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4588                 __func__, buf, buflen, npages, args.acl_len);
4589         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4590                              &msg, &args.seq_args, &res.seq_res, 0);
4591         if (ret)
4592                 goto out_free;
4593
4594         /* Handle the case where the passed-in buffer is too short */
4595         if (res.acl_flags & NFS4_ACL_TRUNC) {
4596                 /* Did the user only issue a request for the acl length? */
4597                 if (buf == NULL)
4598                         goto out_ok;
4599                 ret = -ERANGE;
4600                 goto out_free;
4601         }
4602         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4603         if (buf) {
4604                 if (res.acl_len > buflen) {
4605                         ret = -ERANGE;
4606                         goto out_free;
4607                 }
4608                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4609         }
4610 out_ok:
4611         ret = res.acl_len;
4612 out_free:
4613         for (i = 0; i < npages; i++)
4614                 if (pages[i])
4615                         __free_page(pages[i]);
4616         if (res.acl_scratch)
4617                 __free_page(res.acl_scratch);
4618         return ret;
4619 }
4620
4621 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4622 {
4623         struct nfs4_exception exception = { };
4624         ssize_t ret;
4625         do {
4626                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4627                 trace_nfs4_get_acl(inode, ret);
4628                 if (ret >= 0)
4629                         break;
4630                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4631         } while (exception.retry);
4632         return ret;
4633 }
4634
4635 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4636 {
4637         struct nfs_server *server = NFS_SERVER(inode);
4638         int ret;
4639
4640         if (!nfs4_server_supports_acls(server))
4641                 return -EOPNOTSUPP;
4642         ret = nfs_revalidate_inode(server, inode);
4643         if (ret < 0)
4644                 return ret;
4645         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4646                 nfs_zap_acl_cache(inode);
4647         ret = nfs4_read_cached_acl(inode, buf, buflen);
4648         if (ret != -ENOENT)
4649                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4650                  * but no cached acl data, just the acl length */
4651                 return ret;
4652         return nfs4_get_acl_uncached(inode, buf, buflen);
4653 }
4654
4655 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4656 {
4657         struct nfs_server *server = NFS_SERVER(inode);
4658         struct page *pages[NFS4ACL_MAXPAGES];
4659         struct nfs_setaclargs arg = {
4660                 .fh             = NFS_FH(inode),
4661                 .acl_pages      = pages,
4662                 .acl_len        = buflen,
4663         };
4664         struct nfs_setaclres res;
4665         struct rpc_message msg = {
4666                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4667                 .rpc_argp       = &arg,
4668                 .rpc_resp       = &res,
4669         };
4670         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4671         int ret, i;
4672
4673         if (!nfs4_server_supports_acls(server))
4674                 return -EOPNOTSUPP;
4675         if (npages > ARRAY_SIZE(pages))
4676                 return -ERANGE;
4677         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
4678         if (i < 0)
4679                 return i;
4680         nfs4_inode_return_delegation(inode);
4681         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4682
4683         /*
4684          * Free each page after tx, so the only ref left is
4685          * held by the network stack
4686          */
4687         for (; i > 0; i--)
4688                 put_page(pages[i-1]);
4689
4690         /*
4691          * Acl update can result in inode attribute update.
4692          * so mark the attribute cache invalid.
4693          */
4694         spin_lock(&inode->i_lock);
4695         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4696         spin_unlock(&inode->i_lock);
4697         nfs_access_zap_cache(inode);
4698         nfs_zap_acl_cache(inode);
4699         return ret;
4700 }
4701
4702 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4703 {
4704         struct nfs4_exception exception = { };
4705         int err;
4706         do {
4707                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4708                 trace_nfs4_set_acl(inode, err);
4709                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4710                                 &exception);
4711         } while (exception.retry);
4712         return err;
4713 }
4714
4715 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4716 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4717                                         size_t buflen)
4718 {
4719         struct nfs_server *server = NFS_SERVER(inode);
4720         struct nfs_fattr fattr;
4721         struct nfs4_label label = {0, 0, buflen, buf};
4722
4723         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4724         struct nfs4_getattr_arg arg = {
4725                 .fh             = NFS_FH(inode),
4726                 .bitmask        = bitmask,
4727         };
4728         struct nfs4_getattr_res res = {
4729                 .fattr          = &fattr,
4730                 .label          = &label,
4731                 .server         = server,
4732         };
4733         struct rpc_message msg = {
4734                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4735                 .rpc_argp       = &arg,
4736                 .rpc_resp       = &res,
4737         };
4738         int ret;
4739
4740         nfs_fattr_init(&fattr);
4741
4742         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4743         if (ret)
4744                 return ret;
4745         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4746                 return -ENOENT;
4747         if (buflen < label.len)
4748                 return -ERANGE;
4749         return 0;
4750 }
4751
4752 static int nfs4_get_security_label(struct inode *inode, void *buf,
4753                                         size_t buflen)
4754 {
4755         struct nfs4_exception exception = { };
4756         int err;
4757
4758         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4759                 return -EOPNOTSUPP;
4760
4761         do {
4762                 err = _nfs4_get_security_label(inode, buf, buflen);
4763                 trace_nfs4_get_security_label(inode, err);
4764                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4765                                 &exception);
4766         } while (exception.retry);
4767         return err;
4768 }
4769
4770 static int _nfs4_do_set_security_label(struct inode *inode,
4771                 struct nfs4_label *ilabel,
4772                 struct nfs_fattr *fattr,
4773                 struct nfs4_label *olabel)
4774 {
4775
4776         struct iattr sattr = {0};
4777         struct nfs_server *server = NFS_SERVER(inode);
4778         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4779         struct nfs_setattrargs arg = {
4780                 .fh             = NFS_FH(inode),
4781                 .iap            = &sattr,
4782                 .server         = server,
4783                 .bitmask        = bitmask,
4784                 .label          = ilabel,
4785         };
4786         struct nfs_setattrres res = {
4787                 .fattr          = fattr,
4788                 .label          = olabel,
4789                 .server         = server,
4790         };
4791         struct rpc_message msg = {
4792                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4793                 .rpc_argp       = &arg,
4794                 .rpc_resp       = &res,
4795         };
4796         int status;
4797
4798         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4799
4800         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4801         if (status)
4802                 dprintk("%s failed: %d\n", __func__, status);
4803
4804         return status;
4805 }
4806
4807 static int nfs4_do_set_security_label(struct inode *inode,
4808                 struct nfs4_label *ilabel,
4809                 struct nfs_fattr *fattr,
4810                 struct nfs4_label *olabel)
4811 {
4812         struct nfs4_exception exception = { };
4813         int err;
4814
4815         do {
4816                 err = _nfs4_do_set_security_label(inode, ilabel,
4817                                 fattr, olabel);
4818                 trace_nfs4_set_security_label(inode, err);
4819                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4820                                 &exception);
4821         } while (exception.retry);
4822         return err;
4823 }
4824
4825 static int
4826 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4827 {
4828         struct nfs4_label ilabel, *olabel = NULL;
4829         struct nfs_fattr fattr;
4830         struct rpc_cred *cred;
4831         struct inode *inode = d_inode(dentry);
4832         int status;
4833
4834         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4835                 return -EOPNOTSUPP;
4836
4837         nfs_fattr_init(&fattr);
4838
4839         ilabel.pi = 0;
4840         ilabel.lfs = 0;
4841         ilabel.label = (char *)buf;
4842         ilabel.len = buflen;
4843
4844         cred = rpc_lookup_cred();
4845         if (IS_ERR(cred))
4846                 return PTR_ERR(cred);
4847
4848         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
4849         if (IS_ERR(olabel)) {
4850                 status = -PTR_ERR(olabel);
4851                 goto out;
4852         }
4853
4854         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
4855         if (status == 0)
4856                 nfs_setsecurity(inode, &fattr, olabel);
4857
4858         nfs4_label_free(olabel);
4859 out:
4860         put_rpccred(cred);
4861         return status;
4862 }
4863 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
4864
4865
4866 static int
4867 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
4868                         struct nfs4_state *state, long *timeout)
4869 {
4870         struct nfs_client *clp = server->nfs_client;
4871
4872         if (task->tk_status >= 0)
4873                 return 0;
4874         switch(task->tk_status) {
4875                 case -NFS4ERR_DELEG_REVOKED:
4876                 case -NFS4ERR_ADMIN_REVOKED:
4877                 case -NFS4ERR_BAD_STATEID:
4878                 case -NFS4ERR_OPENMODE:
4879                         if (state == NULL)
4880                                 break;
4881                         if (nfs4_schedule_stateid_recovery(server, state) < 0)
4882                                 goto recovery_failed;
4883                         goto wait_on_recovery;
4884                 case -NFS4ERR_EXPIRED:
4885                         if (state != NULL) {
4886                                 if (nfs4_schedule_stateid_recovery(server, state) < 0)
4887                                         goto recovery_failed;
4888                         }
4889                 case -NFS4ERR_STALE_STATEID:
4890                 case -NFS4ERR_STALE_CLIENTID:
4891                         nfs4_schedule_lease_recovery(clp);
4892                         goto wait_on_recovery;
4893                 case -NFS4ERR_MOVED:
4894                         if (nfs4_schedule_migration_recovery(server) < 0)
4895                                 goto recovery_failed;
4896                         goto wait_on_recovery;
4897                 case -NFS4ERR_LEASE_MOVED:
4898                         nfs4_schedule_lease_moved_recovery(clp);
4899                         goto wait_on_recovery;
4900 #if defined(CONFIG_NFS_V4_1)
4901                 case -NFS4ERR_BADSESSION:
4902                 case -NFS4ERR_BADSLOT:
4903                 case -NFS4ERR_BAD_HIGH_SLOT:
4904                 case -NFS4ERR_DEADSESSION:
4905                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
4906                 case -NFS4ERR_SEQ_FALSE_RETRY:
4907                 case -NFS4ERR_SEQ_MISORDERED:
4908                         dprintk("%s ERROR %d, Reset session\n", __func__,
4909                                 task->tk_status);
4910                         nfs4_schedule_session_recovery(clp->cl_session, task->tk_status);
4911                         goto wait_on_recovery;
4912 #endif /* CONFIG_NFS_V4_1 */
4913                 case -NFS4ERR_DELAY:
4914                         nfs_inc_server_stats(server, NFSIOS_DELAY);
4915                         rpc_delay(task, nfs4_update_delay(timeout));
4916                         goto restart_call;
4917                 case -NFS4ERR_GRACE:
4918                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
4919                 case -NFS4ERR_RETRY_UNCACHED_REP:
4920                 case -NFS4ERR_OLD_STATEID:
4921                         goto restart_call;
4922         }
4923         task->tk_status = nfs4_map_errors(task->tk_status);
4924         return 0;
4925 recovery_failed:
4926         task->tk_status = -EIO;
4927         return 0;
4928 wait_on_recovery:
4929         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
4930         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
4931                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
4932         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
4933                 goto recovery_failed;
4934 restart_call:
4935         task->tk_status = 0;
4936         return -EAGAIN;
4937 }
4938
4939 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
4940                                     nfs4_verifier *bootverf)
4941 {
4942         __be32 verf[2];
4943
4944         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
4945                 /* An impossible timestamp guarantees this value
4946                  * will never match a generated boot time. */
4947                 verf[0] = 0;
4948                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
4949         } else {
4950                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
4951                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
4952                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
4953         }
4954         memcpy(bootverf->data, verf, sizeof(bootverf->data));
4955 }
4956
4957 static unsigned int
4958 nfs4_init_nonuniform_client_string(struct nfs_client *clp,
4959                                    char *buf, size_t len)
4960 {
4961         unsigned int result;
4962
4963         if (clp->cl_owner_id != NULL)
4964                 return strlcpy(buf, clp->cl_owner_id, len);
4965
4966         rcu_read_lock();
4967         result = scnprintf(buf, len, "Linux NFSv4.0 %s/%s %s",
4968                                 clp->cl_ipaddr,
4969                                 rpc_peeraddr2str(clp->cl_rpcclient,
4970                                                         RPC_DISPLAY_ADDR),
4971                                 rpc_peeraddr2str(clp->cl_rpcclient,
4972                                                         RPC_DISPLAY_PROTO));
4973         rcu_read_unlock();
4974         clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4975         return result;
4976 }
4977
4978 static unsigned int
4979 nfs4_init_uniform_client_string(struct nfs_client *clp,
4980                                 char *buf, size_t len)
4981 {
4982         const char *nodename = clp->cl_rpcclient->cl_nodename;
4983         unsigned int result;
4984
4985         if (clp->cl_owner_id != NULL)
4986                 return strlcpy(buf, clp->cl_owner_id, len);
4987
4988         if (nfs4_client_id_uniquifier[0] != '\0')
4989                 result = scnprintf(buf, len, "Linux NFSv%u.%u %s/%s",
4990                                 clp->rpc_ops->version,
4991                                 clp->cl_minorversion,
4992                                 nfs4_client_id_uniquifier,
4993                                 nodename);
4994         else
4995                 result = scnprintf(buf, len, "Linux NFSv%u.%u %s",
4996                                 clp->rpc_ops->version, clp->cl_minorversion,
4997                                 nodename);
4998         clp->cl_owner_id = kstrdup(buf, GFP_KERNEL);
4999         return result;
5000 }
5001
5002 /*
5003  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5004  * services.  Advertise one based on the address family of the
5005  * clientaddr.
5006  */
5007 static unsigned int
5008 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5009 {
5010         if (strchr(clp->cl_ipaddr, ':') != NULL)
5011                 return scnprintf(buf, len, "tcp6");
5012         else
5013                 return scnprintf(buf, len, "tcp");
5014 }
5015
5016 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5017 {
5018         struct nfs4_setclientid *sc = calldata;
5019
5020         if (task->tk_status == 0)
5021                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5022 }
5023
5024 static const struct rpc_call_ops nfs4_setclientid_ops = {
5025         .rpc_call_done = nfs4_setclientid_done,
5026 };
5027
5028 /**
5029  * nfs4_proc_setclientid - Negotiate client ID
5030  * @clp: state data structure
5031  * @program: RPC program for NFSv4 callback service
5032  * @port: IP port number for NFS4 callback service
5033  * @cred: RPC credential to use for this call
5034  * @res: where to place the result
5035  *
5036  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5037  */
5038 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5039                 unsigned short port, struct rpc_cred *cred,
5040                 struct nfs4_setclientid_res *res)
5041 {
5042         nfs4_verifier sc_verifier;
5043         struct nfs4_setclientid setclientid = {
5044                 .sc_verifier = &sc_verifier,
5045                 .sc_prog = program,
5046                 .sc_cb_ident = clp->cl_cb_ident,
5047         };
5048         struct rpc_message msg = {
5049                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5050                 .rpc_argp = &setclientid,
5051                 .rpc_resp = res,
5052                 .rpc_cred = cred,
5053         };
5054         struct rpc_task *task;
5055         struct rpc_task_setup task_setup_data = {
5056                 .rpc_client = clp->cl_rpcclient,
5057                 .rpc_message = &msg,
5058                 .callback_ops = &nfs4_setclientid_ops,
5059                 .callback_data = &setclientid,
5060                 .flags = RPC_TASK_TIMEOUT,
5061         };
5062         int status;
5063
5064         /* nfs_client_id4 */
5065         nfs4_init_boot_verifier(clp, &sc_verifier);
5066         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5067                 setclientid.sc_name_len =
5068                                 nfs4_init_uniform_client_string(clp,
5069                                                 setclientid.sc_name,
5070                                                 sizeof(setclientid.sc_name));
5071         else
5072                 setclientid.sc_name_len =
5073                                 nfs4_init_nonuniform_client_string(clp,
5074                                                 setclientid.sc_name,
5075                                                 sizeof(setclientid.sc_name));
5076         /* cb_client4 */
5077         setclientid.sc_netid_len =
5078                                 nfs4_init_callback_netid(clp,
5079                                                 setclientid.sc_netid,
5080                                                 sizeof(setclientid.sc_netid));
5081         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5082                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5083                                 clp->cl_ipaddr, port >> 8, port & 255);
5084
5085         dprintk("NFS call  setclientid auth=%s, '%.*s'\n",
5086                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5087                 setclientid.sc_name_len, setclientid.sc_name);
5088         task = rpc_run_task(&task_setup_data);
5089         if (IS_ERR(task)) {
5090                 status = PTR_ERR(task);
5091                 goto out;
5092         }
5093         status = task->tk_status;
5094         if (setclientid.sc_cred) {
5095                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5096                 put_rpccred(setclientid.sc_cred);
5097         }
5098         rpc_put_task(task);
5099 out:
5100         trace_nfs4_setclientid(clp, status);
5101         dprintk("NFS reply setclientid: %d\n", status);
5102         return status;
5103 }
5104
5105 /**
5106  * nfs4_proc_setclientid_confirm - Confirm client ID
5107  * @clp: state data structure
5108  * @res: result of a previous SETCLIENTID
5109  * @cred: RPC credential to use for this call
5110  *
5111  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5112  */
5113 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5114                 struct nfs4_setclientid_res *arg,
5115                 struct rpc_cred *cred)
5116 {
5117         struct rpc_message msg = {
5118                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5119                 .rpc_argp = arg,
5120                 .rpc_cred = cred,
5121         };
5122         int status;
5123
5124         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5125                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5126                 clp->cl_clientid);
5127         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5128         trace_nfs4_setclientid_confirm(clp, status);
5129         dprintk("NFS reply setclientid_confirm: %d\n", status);
5130         return status;
5131 }
5132
5133 struct nfs4_delegreturndata {
5134         struct nfs4_delegreturnargs args;
5135         struct nfs4_delegreturnres res;
5136         struct nfs_fh fh;
5137         nfs4_stateid stateid;
5138         unsigned long timestamp;
5139         struct nfs_fattr fattr;
5140         int rpc_status;
5141         struct inode *inode;
5142         bool roc;
5143         u32 roc_barrier;
5144 };
5145
5146 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5147 {
5148         struct nfs4_delegreturndata *data = calldata;
5149
5150         if (!nfs4_sequence_done(task, &data->res.seq_res))
5151                 return;
5152
5153         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5154         switch (task->tk_status) {
5155         case 0:
5156                 renew_lease(data->res.server, data->timestamp);
5157         case -NFS4ERR_ADMIN_REVOKED:
5158         case -NFS4ERR_DELEG_REVOKED:
5159         case -NFS4ERR_BAD_STATEID:
5160         case -NFS4ERR_OLD_STATEID:
5161         case -NFS4ERR_STALE_STATEID:
5162         case -NFS4ERR_EXPIRED:
5163                 task->tk_status = 0;
5164                 if (data->roc)
5165                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5166                 break;
5167         default:
5168                 if (nfs4_async_handle_error(task, data->res.server,
5169                                             NULL, NULL) == -EAGAIN) {
5170                         rpc_restart_call_prepare(task);
5171                         return;
5172                 }
5173         }
5174         data->rpc_status = task->tk_status;
5175 }
5176
5177 static void nfs4_delegreturn_release(void *calldata)
5178 {
5179         struct nfs4_delegreturndata *data = calldata;
5180         struct inode *inode = data->inode;
5181
5182         if (inode) {
5183                 if (data->roc)
5184                         pnfs_roc_release(inode);
5185                 nfs_iput_and_deactive(inode);
5186         }
5187         kfree(calldata);
5188 }
5189
5190 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5191 {
5192         struct nfs4_delegreturndata *d_data;
5193
5194         d_data = (struct nfs4_delegreturndata *)data;
5195
5196         if (d_data->roc &&
5197             pnfs_roc_drain(d_data->inode, &d_data->roc_barrier, task))
5198                 return;
5199
5200         nfs4_setup_sequence(d_data->res.server,
5201                         &d_data->args.seq_args,
5202                         &d_data->res.seq_res,
5203                         task);
5204 }
5205
5206 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5207         .rpc_call_prepare = nfs4_delegreturn_prepare,
5208         .rpc_call_done = nfs4_delegreturn_done,
5209         .rpc_release = nfs4_delegreturn_release,
5210 };
5211
5212 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5213 {
5214         struct nfs4_delegreturndata *data;
5215         struct nfs_server *server = NFS_SERVER(inode);
5216         struct rpc_task *task;
5217         struct rpc_message msg = {
5218                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5219                 .rpc_cred = cred,
5220         };
5221         struct rpc_task_setup task_setup_data = {
5222                 .rpc_client = server->client,
5223                 .rpc_message = &msg,
5224                 .callback_ops = &nfs4_delegreturn_ops,
5225                 .flags = RPC_TASK_ASYNC,
5226         };
5227         int status = 0;
5228
5229         data = kzalloc(sizeof(*data), GFP_NOFS);
5230         if (data == NULL)
5231                 return -ENOMEM;
5232         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5233         data->args.fhandle = &data->fh;
5234         data->args.stateid = &data->stateid;
5235         data->args.bitmask = server->cache_consistency_bitmask;
5236         nfs_copy_fh(&data->fh, NFS_FH(inode));
5237         nfs4_stateid_copy(&data->stateid, stateid);
5238         data->res.fattr = &data->fattr;
5239         data->res.server = server;
5240         nfs_fattr_init(data->res.fattr);
5241         data->timestamp = jiffies;
5242         data->rpc_status = 0;
5243         data->inode = nfs_igrab_and_active(inode);
5244         if (data->inode)
5245                 data->roc = nfs4_roc(inode);
5246
5247         task_setup_data.callback_data = data;
5248         msg.rpc_argp = &data->args;
5249         msg.rpc_resp = &data->res;
5250         task = rpc_run_task(&task_setup_data);
5251         if (IS_ERR(task))
5252                 return PTR_ERR(task);
5253         if (!issync)
5254                 goto out;
5255         status = nfs4_wait_for_completion_rpc_task(task);
5256         if (status != 0)
5257                 goto out;
5258         status = data->rpc_status;
5259         if (status == 0)
5260                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5261         else
5262                 nfs_refresh_inode(inode, &data->fattr);
5263 out:
5264         rpc_put_task(task);
5265         return status;
5266 }
5267
5268 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5269 {
5270         struct nfs_server *server = NFS_SERVER(inode);
5271         struct nfs4_exception exception = { };
5272         int err;
5273         do {
5274                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5275                 trace_nfs4_delegreturn(inode, err);
5276                 switch (err) {
5277                         case -NFS4ERR_STALE_STATEID:
5278                         case -NFS4ERR_EXPIRED:
5279                         case 0:
5280                                 return 0;
5281                 }
5282                 err = nfs4_handle_exception(server, err, &exception);
5283         } while (exception.retry);
5284         return err;
5285 }
5286
5287 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5288 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5289
5290 /*
5291  * sleep, with exponential backoff, and retry the LOCK operation.
5292  */
5293 static unsigned long
5294 nfs4_set_lock_task_retry(unsigned long timeout)
5295 {
5296         freezable_schedule_timeout_killable_unsafe(timeout);
5297         timeout <<= 1;
5298         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5299                 return NFS4_LOCK_MAXTIMEOUT;
5300         return timeout;
5301 }
5302
5303 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5304 {
5305         struct inode *inode = state->inode;
5306         struct nfs_server *server = NFS_SERVER(inode);
5307         struct nfs_client *clp = server->nfs_client;
5308         struct nfs_lockt_args arg = {
5309                 .fh = NFS_FH(inode),
5310                 .fl = request,
5311         };
5312         struct nfs_lockt_res res = {
5313                 .denied = request,
5314         };
5315         struct rpc_message msg = {
5316                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5317                 .rpc_argp       = &arg,
5318                 .rpc_resp       = &res,
5319                 .rpc_cred       = state->owner->so_cred,
5320         };
5321         struct nfs4_lock_state *lsp;
5322         int status;
5323
5324         arg.lock_owner.clientid = clp->cl_clientid;
5325         status = nfs4_set_lock_state(state, request);
5326         if (status != 0)
5327                 goto out;
5328         lsp = request->fl_u.nfs4_fl.owner;
5329         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5330         arg.lock_owner.s_dev = server->s_dev;
5331         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5332         switch (status) {
5333                 case 0:
5334                         request->fl_type = F_UNLCK;
5335                         break;
5336                 case -NFS4ERR_DENIED:
5337                         status = 0;
5338         }
5339         request->fl_ops->fl_release_private(request);
5340         request->fl_ops = NULL;
5341 out:
5342         return status;
5343 }
5344
5345 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5346 {
5347         struct nfs4_exception exception = { };
5348         int err;
5349
5350         do {
5351                 err = _nfs4_proc_getlk(state, cmd, request);
5352                 trace_nfs4_get_lock(request, state, cmd, err);
5353                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5354                                 &exception);
5355         } while (exception.retry);
5356         return err;
5357 }
5358
5359 static int do_vfs_lock(struct file *file, struct file_lock *fl)
5360 {
5361         int res = 0;
5362         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
5363                 case FL_POSIX:
5364                         res = posix_lock_file_wait(file, fl);
5365                         break;
5366                 case FL_FLOCK:
5367                         res = flock_lock_file_wait(file, fl);
5368                         break;
5369                 default:
5370                         BUG();
5371         }
5372         return res;
5373 }
5374
5375 struct nfs4_unlockdata {
5376         struct nfs_locku_args arg;
5377         struct nfs_locku_res res;
5378         struct nfs4_lock_state *lsp;
5379         struct nfs_open_context *ctx;
5380         struct file_lock fl;
5381         const struct nfs_server *server;
5382         unsigned long timestamp;
5383 };
5384
5385 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5386                 struct nfs_open_context *ctx,
5387                 struct nfs4_lock_state *lsp,
5388                 struct nfs_seqid *seqid)
5389 {
5390         struct nfs4_unlockdata *p;
5391         struct inode *inode = lsp->ls_state->inode;
5392
5393         p = kzalloc(sizeof(*p), GFP_NOFS);
5394         if (p == NULL)
5395                 return NULL;
5396         p->arg.fh = NFS_FH(inode);
5397         p->arg.fl = &p->fl;
5398         p->arg.seqid = seqid;
5399         p->res.seqid = seqid;
5400         p->lsp = lsp;
5401         atomic_inc(&lsp->ls_count);
5402         /* Ensure we don't close file until we're done freeing locks! */
5403         p->ctx = get_nfs_open_context(ctx);
5404         memcpy(&p->fl, fl, sizeof(p->fl));
5405         p->server = NFS_SERVER(inode);
5406         return p;
5407 }
5408
5409 static void nfs4_locku_release_calldata(void *data)
5410 {
5411         struct nfs4_unlockdata *calldata = data;
5412         nfs_free_seqid(calldata->arg.seqid);
5413         nfs4_put_lock_state(calldata->lsp);
5414         put_nfs_open_context(calldata->ctx);
5415         kfree(calldata);
5416 }
5417
5418 static void nfs4_locku_done(struct rpc_task *task, void *data)
5419 {
5420         struct nfs4_unlockdata *calldata = data;
5421
5422         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5423                 return;
5424         switch (task->tk_status) {
5425                 case 0:
5426                         renew_lease(calldata->server, calldata->timestamp);
5427                         do_vfs_lock(calldata->fl.fl_file, &calldata->fl);
5428                         if (nfs4_update_lock_stateid(calldata->lsp,
5429                                         &calldata->res.stateid))
5430                                 break;
5431                 case -NFS4ERR_BAD_STATEID:
5432                 case -NFS4ERR_OLD_STATEID:
5433                 case -NFS4ERR_STALE_STATEID:
5434                 case -NFS4ERR_EXPIRED:
5435                         if (!nfs4_stateid_match(&calldata->arg.stateid,
5436                                                 &calldata->lsp->ls_stateid))
5437                                 rpc_restart_call_prepare(task);
5438                         break;
5439                 default:
5440                         if (nfs4_async_handle_error(task, calldata->server,
5441                                                     NULL, NULL) == -EAGAIN)
5442                                 rpc_restart_call_prepare(task);
5443         }
5444         nfs_release_seqid(calldata->arg.seqid);
5445 }
5446
5447 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5448 {
5449         struct nfs4_unlockdata *calldata = data;
5450
5451         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5452                 goto out_wait;
5453         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5454         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5455                 /* Note: exit _without_ running nfs4_locku_done */
5456                 goto out_no_action;
5457         }
5458         calldata->timestamp = jiffies;
5459         if (nfs4_setup_sequence(calldata->server,
5460                                 &calldata->arg.seq_args,
5461                                 &calldata->res.seq_res,
5462                                 task) != 0)
5463                 nfs_release_seqid(calldata->arg.seqid);
5464         return;
5465 out_no_action:
5466         task->tk_action = NULL;
5467 out_wait:
5468         nfs4_sequence_done(task, &calldata->res.seq_res);
5469 }
5470
5471 static const struct rpc_call_ops nfs4_locku_ops = {
5472         .rpc_call_prepare = nfs4_locku_prepare,
5473         .rpc_call_done = nfs4_locku_done,
5474         .rpc_release = nfs4_locku_release_calldata,
5475 };
5476
5477 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5478                 struct nfs_open_context *ctx,
5479                 struct nfs4_lock_state *lsp,
5480                 struct nfs_seqid *seqid)
5481 {
5482         struct nfs4_unlockdata *data;
5483         struct rpc_message msg = {
5484                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5485                 .rpc_cred = ctx->cred,
5486         };
5487         struct rpc_task_setup task_setup_data = {
5488                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5489                 .rpc_message = &msg,
5490                 .callback_ops = &nfs4_locku_ops,
5491                 .workqueue = nfsiod_workqueue,
5492                 .flags = RPC_TASK_ASYNC,
5493         };
5494
5495         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5496                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5497
5498         /* Ensure this is an unlock - when canceling a lock, the
5499          * canceled lock is passed in, and it won't be an unlock.
5500          */
5501         fl->fl_type = F_UNLCK;
5502
5503         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5504         if (data == NULL) {
5505                 nfs_free_seqid(seqid);
5506                 return ERR_PTR(-ENOMEM);
5507         }
5508
5509         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5510         msg.rpc_argp = &data->arg;
5511         msg.rpc_resp = &data->res;
5512         task_setup_data.callback_data = data;
5513         return rpc_run_task(&task_setup_data);
5514 }
5515
5516 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5517 {
5518         struct inode *inode = state->inode;
5519         struct nfs4_state_owner *sp = state->owner;
5520         struct nfs_inode *nfsi = NFS_I(inode);
5521         struct nfs_seqid *seqid;
5522         struct nfs4_lock_state *lsp;
5523         struct rpc_task *task;
5524         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5525         int status = 0;
5526         unsigned char fl_flags = request->fl_flags;
5527
5528         status = nfs4_set_lock_state(state, request);
5529         /* Unlock _before_ we do the RPC call */
5530         request->fl_flags |= FL_EXISTS;
5531         /* Exclude nfs_delegation_claim_locks() */
5532         mutex_lock(&sp->so_delegreturn_mutex);
5533         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5534         down_read(&nfsi->rwsem);
5535         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
5536                 up_read(&nfsi->rwsem);
5537                 mutex_unlock(&sp->so_delegreturn_mutex);
5538                 goto out;
5539         }
5540         up_read(&nfsi->rwsem);
5541         mutex_unlock(&sp->so_delegreturn_mutex);
5542         if (status != 0)
5543                 goto out;
5544         /* Is this a delegated lock? */
5545         lsp = request->fl_u.nfs4_fl.owner;
5546         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5547                 goto out;
5548         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5549         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5550         status = -ENOMEM;
5551         if (IS_ERR(seqid))
5552                 goto out;
5553         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5554         status = PTR_ERR(task);
5555         if (IS_ERR(task))
5556                 goto out;
5557         status = nfs4_wait_for_completion_rpc_task(task);
5558         rpc_put_task(task);
5559 out:
5560         request->fl_flags = fl_flags;
5561         trace_nfs4_unlock(request, state, F_SETLK, status);
5562         return status;
5563 }
5564
5565 struct nfs4_lockdata {
5566         struct nfs_lock_args arg;
5567         struct nfs_lock_res res;
5568         struct nfs4_lock_state *lsp;
5569         struct nfs_open_context *ctx;
5570         struct file_lock fl;
5571         unsigned long timestamp;
5572         int rpc_status;
5573         int cancelled;
5574         struct nfs_server *server;
5575 };
5576
5577 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5578                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5579                 gfp_t gfp_mask)
5580 {
5581         struct nfs4_lockdata *p;
5582         struct inode *inode = lsp->ls_state->inode;
5583         struct nfs_server *server = NFS_SERVER(inode);
5584         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5585
5586         p = kzalloc(sizeof(*p), gfp_mask);
5587         if (p == NULL)
5588                 return NULL;
5589
5590         p->arg.fh = NFS_FH(inode);
5591         p->arg.fl = &p->fl;
5592         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5593         if (IS_ERR(p->arg.open_seqid))
5594                 goto out_free;
5595         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
5596         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5597         if (IS_ERR(p->arg.lock_seqid))
5598                 goto out_free_seqid;
5599         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5600         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5601         p->arg.lock_owner.s_dev = server->s_dev;
5602         p->res.lock_seqid = p->arg.lock_seqid;
5603         p->lsp = lsp;
5604         p->server = server;
5605         atomic_inc(&lsp->ls_count);
5606         p->ctx = get_nfs_open_context(ctx);
5607         memcpy(&p->fl, fl, sizeof(p->fl));
5608         return p;
5609 out_free_seqid:
5610         nfs_free_seqid(p->arg.open_seqid);
5611 out_free:
5612         kfree(p);
5613         return NULL;
5614 }
5615
5616 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5617 {
5618         struct nfs4_lockdata *data = calldata;
5619         struct nfs4_state *state = data->lsp->ls_state;
5620
5621         dprintk("%s: begin!\n", __func__);
5622         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5623                 goto out_wait;
5624         /* Do we need to do an open_to_lock_owner? */
5625         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5626                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5627                         goto out_release_lock_seqid;
5628                 }
5629                 nfs4_stateid_copy(&data->arg.open_stateid,
5630                                 &state->open_stateid);
5631                 data->arg.new_lock_owner = 1;
5632                 data->res.open_seqid = data->arg.open_seqid;
5633         } else {
5634                 data->arg.new_lock_owner = 0;
5635                 nfs4_stateid_copy(&data->arg.lock_stateid,
5636                                 &data->lsp->ls_stateid);
5637         }
5638         if (!nfs4_valid_open_stateid(state)) {
5639                 data->rpc_status = -EBADF;
5640                 task->tk_action = NULL;
5641                 goto out_release_open_seqid;
5642         }
5643         data->timestamp = jiffies;
5644         if (nfs4_setup_sequence(data->server,
5645                                 &data->arg.seq_args,
5646                                 &data->res.seq_res,
5647                                 task) == 0)
5648                 return;
5649 out_release_open_seqid:
5650         nfs_release_seqid(data->arg.open_seqid);
5651 out_release_lock_seqid:
5652         nfs_release_seqid(data->arg.lock_seqid);
5653 out_wait:
5654         nfs4_sequence_done(task, &data->res.seq_res);
5655         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5656 }
5657
5658 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5659 {
5660         struct nfs4_lockdata *data = calldata;
5661         struct nfs4_lock_state *lsp = data->lsp;
5662
5663         dprintk("%s: begin!\n", __func__);
5664
5665         if (!nfs4_sequence_done(task, &data->res.seq_res))
5666                 return;
5667
5668         data->rpc_status = task->tk_status;
5669         switch (task->tk_status) {
5670         case 0:
5671                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
5672                                 data->timestamp);
5673                 if (data->arg.new_lock) {
5674                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5675                         if (do_vfs_lock(data->fl.fl_file, &data->fl) < 0) {
5676                                 rpc_restart_call_prepare(task);
5677                                 break;
5678                         }
5679                 }
5680                 if (data->arg.new_lock_owner != 0) {
5681                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
5682                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5683                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5684                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5685                         rpc_restart_call_prepare(task);
5686                 break;
5687         case -NFS4ERR_BAD_STATEID:
5688         case -NFS4ERR_OLD_STATEID:
5689         case -NFS4ERR_STALE_STATEID:
5690         case -NFS4ERR_EXPIRED:
5691                 if (data->arg.new_lock_owner != 0) {
5692                         if (!nfs4_stateid_match(&data->arg.open_stateid,
5693                                                 &lsp->ls_state->open_stateid))
5694                                 rpc_restart_call_prepare(task);
5695                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5696                                                 &lsp->ls_stateid))
5697                                 rpc_restart_call_prepare(task);
5698         }
5699         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5700 }
5701
5702 static void nfs4_lock_release(void *calldata)
5703 {
5704         struct nfs4_lockdata *data = calldata;
5705
5706         dprintk("%s: begin!\n", __func__);
5707         nfs_free_seqid(data->arg.open_seqid);
5708         if (data->cancelled != 0) {
5709                 struct rpc_task *task;
5710                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5711                                 data->arg.lock_seqid);
5712                 if (!IS_ERR(task))
5713                         rpc_put_task_async(task);
5714                 dprintk("%s: cancelling lock!\n", __func__);
5715         } else
5716                 nfs_free_seqid(data->arg.lock_seqid);
5717         nfs4_put_lock_state(data->lsp);
5718         put_nfs_open_context(data->ctx);
5719         kfree(data);
5720         dprintk("%s: done!\n", __func__);
5721 }
5722
5723 static const struct rpc_call_ops nfs4_lock_ops = {
5724         .rpc_call_prepare = nfs4_lock_prepare,
5725         .rpc_call_done = nfs4_lock_done,
5726         .rpc_release = nfs4_lock_release,
5727 };
5728
5729 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5730 {
5731         switch (error) {
5732         case -NFS4ERR_ADMIN_REVOKED:
5733         case -NFS4ERR_BAD_STATEID:
5734                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5735                 if (new_lock_owner != 0 ||
5736                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5737                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5738                 break;
5739         case -NFS4ERR_STALE_STATEID:
5740                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5741         case -NFS4ERR_EXPIRED:
5742                 nfs4_schedule_lease_recovery(server->nfs_client);
5743         };
5744 }
5745
5746 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5747 {
5748         struct nfs4_lockdata *data;
5749         struct rpc_task *task;
5750         struct rpc_message msg = {
5751                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5752                 .rpc_cred = state->owner->so_cred,
5753         };
5754         struct rpc_task_setup task_setup_data = {
5755                 .rpc_client = NFS_CLIENT(state->inode),
5756                 .rpc_message = &msg,
5757                 .callback_ops = &nfs4_lock_ops,
5758                 .workqueue = nfsiod_workqueue,
5759                 .flags = RPC_TASK_ASYNC,
5760         };
5761         int ret;
5762
5763         dprintk("%s: begin!\n", __func__);
5764         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5765                         fl->fl_u.nfs4_fl.owner,
5766                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5767         if (data == NULL)
5768                 return -ENOMEM;
5769         if (IS_SETLKW(cmd))
5770                 data->arg.block = 1;
5771         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5772         msg.rpc_argp = &data->arg;
5773         msg.rpc_resp = &data->res;
5774         task_setup_data.callback_data = data;
5775         if (recovery_type > NFS_LOCK_NEW) {
5776                 if (recovery_type == NFS_LOCK_RECLAIM)
5777                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5778                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5779         } else
5780                 data->arg.new_lock = 1;
5781         task = rpc_run_task(&task_setup_data);
5782         if (IS_ERR(task))
5783                 return PTR_ERR(task);
5784         ret = nfs4_wait_for_completion_rpc_task(task);
5785         if (ret == 0) {
5786                 ret = data->rpc_status;
5787                 if (ret)
5788                         nfs4_handle_setlk_error(data->server, data->lsp,
5789                                         data->arg.new_lock_owner, ret);
5790         } else
5791                 data->cancelled = 1;
5792         rpc_put_task(task);
5793         dprintk("%s: done, ret = %d!\n", __func__, ret);
5794         return ret;
5795 }
5796
5797 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5798 {
5799         struct nfs_server *server = NFS_SERVER(state->inode);
5800         struct nfs4_exception exception = {
5801                 .inode = state->inode,
5802         };
5803         int err;
5804
5805         do {
5806                 /* Cache the lock if possible... */
5807                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5808                         return 0;
5809                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5810                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5811                 if (err != -NFS4ERR_DELAY)
5812                         break;
5813                 nfs4_handle_exception(server, err, &exception);
5814         } while (exception.retry);
5815         return err;
5816 }
5817
5818 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5819 {
5820         struct nfs_server *server = NFS_SERVER(state->inode);
5821         struct nfs4_exception exception = {
5822                 .inode = state->inode,
5823         };
5824         int err;
5825
5826         err = nfs4_set_lock_state(state, request);
5827         if (err != 0)
5828                 return err;
5829         if (!recover_lost_locks) {
5830                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5831                 return 0;
5832         }
5833         do {
5834                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5835                         return 0;
5836                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5837                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5838                 switch (err) {
5839                 default:
5840                         goto out;
5841                 case -NFS4ERR_GRACE:
5842                 case -NFS4ERR_DELAY:
5843                         nfs4_handle_exception(server, err, &exception);
5844                         err = 0;
5845                 }
5846         } while (exception.retry);
5847 out:
5848         return err;
5849 }
5850
5851 #if defined(CONFIG_NFS_V4_1)
5852 /**
5853  * nfs41_check_expired_locks - possibly free a lock stateid
5854  *
5855  * @state: NFSv4 state for an inode
5856  *
5857  * Returns NFS_OK if recovery for this stateid is now finished.
5858  * Otherwise a negative NFS4ERR value is returned.
5859  */
5860 static int nfs41_check_expired_locks(struct nfs4_state *state)
5861 {
5862         int status, ret = -NFS4ERR_BAD_STATEID;
5863         struct nfs4_lock_state *lsp;
5864         struct nfs_server *server = NFS_SERVER(state->inode);
5865
5866         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
5867                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
5868                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
5869
5870                         status = nfs41_test_stateid(server,
5871                                         &lsp->ls_stateid,
5872                                         cred);
5873                         trace_nfs4_test_lock_stateid(state, lsp, status);
5874                         if (status != NFS_OK) {
5875                                 /* Free the stateid unless the server
5876                                  * informs us the stateid is unrecognized. */
5877                                 if (status != -NFS4ERR_BAD_STATEID)
5878                                         nfs41_free_stateid(server,
5879                                                         &lsp->ls_stateid,
5880                                                         cred);
5881                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5882                                 ret = status;
5883                         }
5884                 }
5885         };
5886
5887         return ret;
5888 }
5889
5890 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
5891 {
5892         int status = NFS_OK;
5893
5894         if (test_bit(LK_STATE_IN_USE, &state->flags))
5895                 status = nfs41_check_expired_locks(state);
5896         if (status != NFS_OK)
5897                 status = nfs4_lock_expired(state, request);
5898         return status;
5899 }
5900 #endif
5901
5902 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5903 {
5904         struct nfs_inode *nfsi = NFS_I(state->inode);
5905         unsigned char fl_flags = request->fl_flags;
5906         int status = -ENOLCK;
5907
5908         if ((fl_flags & FL_POSIX) &&
5909                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
5910                 goto out;
5911         /* Is this a delegated open? */
5912         status = nfs4_set_lock_state(state, request);
5913         if (status != 0)
5914                 goto out;
5915         request->fl_flags |= FL_ACCESS;
5916         status = do_vfs_lock(request->fl_file, request);
5917         if (status < 0)
5918                 goto out;
5919         down_read(&nfsi->rwsem);
5920         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
5921                 /* Yes: cache locks! */
5922                 /* ...but avoid races with delegation recall... */
5923                 request->fl_flags = fl_flags & ~FL_SLEEP;
5924                 status = do_vfs_lock(request->fl_file, request);
5925                 up_read(&nfsi->rwsem);
5926                 goto out;
5927         }
5928         up_read(&nfsi->rwsem);
5929         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
5930 out:
5931         request->fl_flags = fl_flags;
5932         return status;
5933 }
5934
5935 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5936 {
5937         struct nfs4_exception exception = {
5938                 .state = state,
5939                 .inode = state->inode,
5940         };
5941         int err;
5942
5943         do {
5944                 err = _nfs4_proc_setlk(state, cmd, request);
5945                 trace_nfs4_set_lock(request, state, cmd, err);
5946                 if (err == -NFS4ERR_DENIED)
5947                         err = -EAGAIN;
5948                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
5949                                 err, &exception);
5950         } while (exception.retry);
5951         return err;
5952 }
5953
5954 static int
5955 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
5956 {
5957         struct nfs_open_context *ctx;
5958         struct nfs4_state *state;
5959         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
5960         int status;
5961
5962         /* verify open state */
5963         ctx = nfs_file_open_context(filp);
5964         state = ctx->state;
5965
5966         if (request->fl_start < 0 || request->fl_end < 0)
5967                 return -EINVAL;
5968
5969         if (IS_GETLK(cmd)) {
5970                 if (state != NULL)
5971                         return nfs4_proc_getlk(state, F_GETLK, request);
5972                 return 0;
5973         }
5974
5975         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
5976                 return -EINVAL;
5977
5978         if (request->fl_type == F_UNLCK) {
5979                 if (state != NULL)
5980                         return nfs4_proc_unlck(state, cmd, request);
5981                 return 0;
5982         }
5983
5984         if (state == NULL)
5985                 return -ENOLCK;
5986         /*
5987          * Don't rely on the VFS having checked the file open mode,
5988          * since it won't do this for flock() locks.
5989          */
5990         switch (request->fl_type) {
5991         case F_RDLCK:
5992                 if (!(filp->f_mode & FMODE_READ))
5993                         return -EBADF;
5994                 break;
5995         case F_WRLCK:
5996                 if (!(filp->f_mode & FMODE_WRITE))
5997                         return -EBADF;
5998         }
5999
6000         do {
6001                 status = nfs4_proc_setlk(state, cmd, request);
6002                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6003                         break;
6004                 timeout = nfs4_set_lock_task_retry(timeout);
6005                 status = -ERESTARTSYS;
6006                 if (signalled())
6007                         break;
6008         } while(status < 0);
6009         return status;
6010 }
6011
6012 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6013 {
6014         struct nfs_server *server = NFS_SERVER(state->inode);
6015         int err;
6016
6017         err = nfs4_set_lock_state(state, fl);
6018         if (err != 0)
6019                 return err;
6020         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6021         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6022 }
6023
6024 struct nfs_release_lockowner_data {
6025         struct nfs4_lock_state *lsp;
6026         struct nfs_server *server;
6027         struct nfs_release_lockowner_args args;
6028         struct nfs_release_lockowner_res res;
6029         unsigned long timestamp;
6030 };
6031
6032 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6033 {
6034         struct nfs_release_lockowner_data *data = calldata;
6035         struct nfs_server *server = data->server;
6036         nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6037                              &data->args.seq_args, &data->res.seq_res, task);
6038         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6039         data->timestamp = jiffies;
6040 }
6041
6042 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6043 {
6044         struct nfs_release_lockowner_data *data = calldata;
6045         struct nfs_server *server = data->server;
6046
6047         nfs40_sequence_done(task, &data->res.seq_res);
6048
6049         switch (task->tk_status) {
6050         case 0:
6051                 renew_lease(server, data->timestamp);
6052                 break;
6053         case -NFS4ERR_STALE_CLIENTID:
6054         case -NFS4ERR_EXPIRED:
6055                 nfs4_schedule_lease_recovery(server->nfs_client);
6056                 break;
6057         case -NFS4ERR_LEASE_MOVED:
6058         case -NFS4ERR_DELAY:
6059                 if (nfs4_async_handle_error(task, server,
6060                                             NULL, NULL) == -EAGAIN)
6061                         rpc_restart_call_prepare(task);
6062         }
6063 }
6064
6065 static void nfs4_release_lockowner_release(void *calldata)
6066 {
6067         struct nfs_release_lockowner_data *data = calldata;
6068         nfs4_free_lock_state(data->server, data->lsp);
6069         kfree(calldata);
6070 }
6071
6072 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6073         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6074         .rpc_call_done = nfs4_release_lockowner_done,
6075         .rpc_release = nfs4_release_lockowner_release,
6076 };
6077
6078 static void
6079 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6080 {
6081         struct nfs_release_lockowner_data *data;
6082         struct rpc_message msg = {
6083                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6084         };
6085
6086         if (server->nfs_client->cl_mvops->minor_version != 0)
6087                 return;
6088
6089         data = kmalloc(sizeof(*data), GFP_NOFS);
6090         if (!data)
6091                 return;
6092         data->lsp = lsp;
6093         data->server = server;
6094         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6095         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6096         data->args.lock_owner.s_dev = server->s_dev;
6097
6098         msg.rpc_argp = &data->args;
6099         msg.rpc_resp = &data->res;
6100         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6101         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6102 }
6103
6104 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6105
6106 static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
6107                                    const void *buf, size_t buflen,
6108                                    int flags, int type)
6109 {
6110         if (strcmp(key, "") != 0)
6111                 return -EINVAL;
6112
6113         return nfs4_proc_set_acl(d_inode(dentry), buf, buflen);
6114 }
6115
6116 static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
6117                                    void *buf, size_t buflen, int type)
6118 {
6119         if (strcmp(key, "") != 0)
6120                 return -EINVAL;
6121
6122         return nfs4_proc_get_acl(d_inode(dentry), buf, buflen);
6123 }
6124
6125 static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
6126                                        size_t list_len, const char *name,
6127                                        size_t name_len, int type)
6128 {
6129         size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
6130
6131         if (!nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry))))
6132                 return 0;
6133
6134         if (list && len <= list_len)
6135                 memcpy(list, XATTR_NAME_NFSV4_ACL, len);
6136         return len;
6137 }
6138
6139 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6140 static inline int nfs4_server_supports_labels(struct nfs_server *server)
6141 {
6142         return server->caps & NFS_CAP_SECURITY_LABEL;
6143 }
6144
6145 static int nfs4_xattr_set_nfs4_label(struct dentry *dentry, const char *key,
6146                                    const void *buf, size_t buflen,
6147                                    int flags, int type)
6148 {
6149         if (security_ismaclabel(key))
6150                 return nfs4_set_security_label(dentry, buf, buflen);
6151
6152         return -EOPNOTSUPP;
6153 }
6154
6155 static int nfs4_xattr_get_nfs4_label(struct dentry *dentry, const char *key,
6156                                    void *buf, size_t buflen, int type)
6157 {
6158         if (security_ismaclabel(key))
6159                 return nfs4_get_security_label(d_inode(dentry), buf, buflen);
6160         return -EOPNOTSUPP;
6161 }
6162
6163 static size_t nfs4_xattr_list_nfs4_label(struct dentry *dentry, char *list,
6164                                        size_t list_len, const char *name,
6165                                        size_t name_len, int type)
6166 {
6167         size_t len = 0;
6168
6169         if (nfs_server_capable(d_inode(dentry), NFS_CAP_SECURITY_LABEL)) {
6170                 len = security_inode_listsecurity(d_inode(dentry), NULL, 0);
6171                 if (list && len <= list_len)
6172                         security_inode_listsecurity(d_inode(dentry), list, len);
6173         }
6174         return len;
6175 }
6176
6177 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6178         .prefix = XATTR_SECURITY_PREFIX,
6179         .list   = nfs4_xattr_list_nfs4_label,
6180         .get    = nfs4_xattr_get_nfs4_label,
6181         .set    = nfs4_xattr_set_nfs4_label,
6182 };
6183 #endif
6184
6185
6186 /*
6187  * nfs_fhget will use either the mounted_on_fileid or the fileid
6188  */
6189 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6190 {
6191         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6192                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6193               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6194               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6195                 return;
6196
6197         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6198                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6199         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6200         fattr->nlink = 2;
6201 }
6202
6203 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6204                                    const struct qstr *name,
6205                                    struct nfs4_fs_locations *fs_locations,
6206                                    struct page *page)
6207 {
6208         struct nfs_server *server = NFS_SERVER(dir);
6209         u32 bitmask[3] = {
6210                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6211         };
6212         struct nfs4_fs_locations_arg args = {
6213                 .dir_fh = NFS_FH(dir),
6214                 .name = name,
6215                 .page = page,
6216                 .bitmask = bitmask,
6217         };
6218         struct nfs4_fs_locations_res res = {
6219                 .fs_locations = fs_locations,
6220         };
6221         struct rpc_message msg = {
6222                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6223                 .rpc_argp = &args,
6224                 .rpc_resp = &res,
6225         };
6226         int status;
6227
6228         dprintk("%s: start\n", __func__);
6229
6230         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6231          * is not supported */
6232         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6233                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6234         else
6235                 bitmask[0] |= FATTR4_WORD0_FILEID;
6236
6237         nfs_fattr_init(&fs_locations->fattr);
6238         fs_locations->server = server;
6239         fs_locations->nlocations = 0;
6240         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6241         dprintk("%s: returned status = %d\n", __func__, status);
6242         return status;
6243 }
6244
6245 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6246                            const struct qstr *name,
6247                            struct nfs4_fs_locations *fs_locations,
6248                            struct page *page)
6249 {
6250         struct nfs4_exception exception = { };
6251         int err;
6252         do {
6253                 err = _nfs4_proc_fs_locations(client, dir, name,
6254                                 fs_locations, page);
6255                 trace_nfs4_get_fs_locations(dir, name, err);
6256                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6257                                 &exception);
6258         } while (exception.retry);
6259         return err;
6260 }
6261
6262 /*
6263  * This operation also signals the server that this client is
6264  * performing migration recovery.  The server can stop returning
6265  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6266  * appended to this compound to identify the client ID which is
6267  * performing recovery.
6268  */
6269 static int _nfs40_proc_get_locations(struct inode *inode,
6270                                      struct nfs4_fs_locations *locations,
6271                                      struct page *page, struct rpc_cred *cred)
6272 {
6273         struct nfs_server *server = NFS_SERVER(inode);
6274         struct rpc_clnt *clnt = server->client;
6275         u32 bitmask[2] = {
6276                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6277         };
6278         struct nfs4_fs_locations_arg args = {
6279                 .clientid       = server->nfs_client->cl_clientid,
6280                 .fh             = NFS_FH(inode),
6281                 .page           = page,
6282                 .bitmask        = bitmask,
6283                 .migration      = 1,            /* skip LOOKUP */
6284                 .renew          = 1,            /* append RENEW */
6285         };
6286         struct nfs4_fs_locations_res res = {
6287                 .fs_locations   = locations,
6288                 .migration      = 1,
6289                 .renew          = 1,
6290         };
6291         struct rpc_message msg = {
6292                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6293                 .rpc_argp       = &args,
6294                 .rpc_resp       = &res,
6295                 .rpc_cred       = cred,
6296         };
6297         unsigned long now = jiffies;
6298         int status;
6299
6300         nfs_fattr_init(&locations->fattr);
6301         locations->server = server;
6302         locations->nlocations = 0;
6303
6304         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6305         nfs4_set_sequence_privileged(&args.seq_args);
6306         status = nfs4_call_sync_sequence(clnt, server, &msg,
6307                                         &args.seq_args, &res.seq_res);
6308         if (status)
6309                 return status;
6310
6311         renew_lease(server, now);
6312         return 0;
6313 }
6314
6315 #ifdef CONFIG_NFS_V4_1
6316
6317 /*
6318  * This operation also signals the server that this client is
6319  * performing migration recovery.  The server can stop asserting
6320  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6321  * performing this operation is identified in the SEQUENCE
6322  * operation in this compound.
6323  *
6324  * When the client supports GETATTR(fs_locations_info), it can
6325  * be plumbed in here.
6326  */
6327 static int _nfs41_proc_get_locations(struct inode *inode,
6328                                      struct nfs4_fs_locations *locations,
6329                                      struct page *page, struct rpc_cred *cred)
6330 {
6331         struct nfs_server *server = NFS_SERVER(inode);
6332         struct rpc_clnt *clnt = server->client;
6333         u32 bitmask[2] = {
6334                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6335         };
6336         struct nfs4_fs_locations_arg args = {
6337                 .fh             = NFS_FH(inode),
6338                 .page           = page,
6339                 .bitmask        = bitmask,
6340                 .migration      = 1,            /* skip LOOKUP */
6341         };
6342         struct nfs4_fs_locations_res res = {
6343                 .fs_locations   = locations,
6344                 .migration      = 1,
6345         };
6346         struct rpc_message msg = {
6347                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6348                 .rpc_argp       = &args,
6349                 .rpc_resp       = &res,
6350                 .rpc_cred       = cred,
6351         };
6352         int status;
6353
6354         nfs_fattr_init(&locations->fattr);
6355         locations->server = server;
6356         locations->nlocations = 0;
6357
6358         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6359         nfs4_set_sequence_privileged(&args.seq_args);
6360         status = nfs4_call_sync_sequence(clnt, server, &msg,
6361                                         &args.seq_args, &res.seq_res);
6362         if (status == NFS4_OK &&
6363             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6364                 status = -NFS4ERR_LEASE_MOVED;
6365         return status;
6366 }
6367
6368 #endif  /* CONFIG_NFS_V4_1 */
6369
6370 /**
6371  * nfs4_proc_get_locations - discover locations for a migrated FSID
6372  * @inode: inode on FSID that is migrating
6373  * @locations: result of query
6374  * @page: buffer
6375  * @cred: credential to use for this operation
6376  *
6377  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6378  * operation failed, or a negative errno if a local error occurred.
6379  *
6380  * On success, "locations" is filled in, but if the server has
6381  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6382  * asserted.
6383  *
6384  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6385  * from this client that require migration recovery.
6386  */
6387 int nfs4_proc_get_locations(struct inode *inode,
6388                             struct nfs4_fs_locations *locations,
6389                             struct page *page, struct rpc_cred *cred)
6390 {
6391         struct nfs_server *server = NFS_SERVER(inode);
6392         struct nfs_client *clp = server->nfs_client;
6393         const struct nfs4_mig_recovery_ops *ops =
6394                                         clp->cl_mvops->mig_recovery_ops;
6395         struct nfs4_exception exception = { };
6396         int status;
6397
6398         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6399                 (unsigned long long)server->fsid.major,
6400                 (unsigned long long)server->fsid.minor,
6401                 clp->cl_hostname);
6402         nfs_display_fhandle(NFS_FH(inode), __func__);
6403
6404         do {
6405                 status = ops->get_locations(inode, locations, page, cred);
6406                 if (status != -NFS4ERR_DELAY)
6407                         break;
6408                 nfs4_handle_exception(server, status, &exception);
6409         } while (exception.retry);
6410         return status;
6411 }
6412
6413 /*
6414  * This operation also signals the server that this client is
6415  * performing "lease moved" recovery.  The server can stop
6416  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6417  * is appended to this compound to identify the client ID which is
6418  * performing recovery.
6419  */
6420 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6421 {
6422         struct nfs_server *server = NFS_SERVER(inode);
6423         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6424         struct rpc_clnt *clnt = server->client;
6425         struct nfs4_fsid_present_arg args = {
6426                 .fh             = NFS_FH(inode),
6427                 .clientid       = clp->cl_clientid,
6428                 .renew          = 1,            /* append RENEW */
6429         };
6430         struct nfs4_fsid_present_res res = {
6431                 .renew          = 1,
6432         };
6433         struct rpc_message msg = {
6434                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6435                 .rpc_argp       = &args,
6436                 .rpc_resp       = &res,
6437                 .rpc_cred       = cred,
6438         };
6439         unsigned long now = jiffies;
6440         int status;
6441
6442         res.fh = nfs_alloc_fhandle();
6443         if (res.fh == NULL)
6444                 return -ENOMEM;
6445
6446         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6447         nfs4_set_sequence_privileged(&args.seq_args);
6448         status = nfs4_call_sync_sequence(clnt, server, &msg,
6449                                                 &args.seq_args, &res.seq_res);
6450         nfs_free_fhandle(res.fh);
6451         if (status)
6452                 return status;
6453
6454         do_renew_lease(clp, now);
6455         return 0;
6456 }
6457
6458 #ifdef CONFIG_NFS_V4_1
6459
6460 /*
6461  * This operation also signals the server that this client is
6462  * performing "lease moved" recovery.  The server can stop asserting
6463  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6464  * this operation is identified in the SEQUENCE operation in this
6465  * compound.
6466  */
6467 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6468 {
6469         struct nfs_server *server = NFS_SERVER(inode);
6470         struct rpc_clnt *clnt = server->client;
6471         struct nfs4_fsid_present_arg args = {
6472                 .fh             = NFS_FH(inode),
6473         };
6474         struct nfs4_fsid_present_res res = {
6475         };
6476         struct rpc_message msg = {
6477                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6478                 .rpc_argp       = &args,
6479                 .rpc_resp       = &res,
6480                 .rpc_cred       = cred,
6481         };
6482         int status;
6483
6484         res.fh = nfs_alloc_fhandle();
6485         if (res.fh == NULL)
6486                 return -ENOMEM;
6487
6488         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6489         nfs4_set_sequence_privileged(&args.seq_args);
6490         status = nfs4_call_sync_sequence(clnt, server, &msg,
6491                                                 &args.seq_args, &res.seq_res);
6492         nfs_free_fhandle(res.fh);
6493         if (status == NFS4_OK &&
6494             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6495                 status = -NFS4ERR_LEASE_MOVED;
6496         return status;
6497 }
6498
6499 #endif  /* CONFIG_NFS_V4_1 */
6500
6501 /**
6502  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6503  * @inode: inode on FSID to check
6504  * @cred: credential to use for this operation
6505  *
6506  * Server indicates whether the FSID is present, moved, or not
6507  * recognized.  This operation is necessary to clear a LEASE_MOVED
6508  * condition for this client ID.
6509  *
6510  * Returns NFS4_OK if the FSID is present on this server,
6511  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6512  *  NFS4ERR code if some error occurred on the server, or a
6513  *  negative errno if a local failure occurred.
6514  */
6515 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6516 {
6517         struct nfs_server *server = NFS_SERVER(inode);
6518         struct nfs_client *clp = server->nfs_client;
6519         const struct nfs4_mig_recovery_ops *ops =
6520                                         clp->cl_mvops->mig_recovery_ops;
6521         struct nfs4_exception exception = { };
6522         int status;
6523
6524         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6525                 (unsigned long long)server->fsid.major,
6526                 (unsigned long long)server->fsid.minor,
6527                 clp->cl_hostname);
6528         nfs_display_fhandle(NFS_FH(inode), __func__);
6529
6530         do {
6531                 status = ops->fsid_present(inode, cred);
6532                 if (status != -NFS4ERR_DELAY)
6533                         break;
6534                 nfs4_handle_exception(server, status, &exception);
6535         } while (exception.retry);
6536         return status;
6537 }
6538
6539 /**
6540  * If 'use_integrity' is true and the state managment nfs_client
6541  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6542  * and the machine credential as per RFC3530bis and RFC5661 Security
6543  * Considerations sections. Otherwise, just use the user cred with the
6544  * filesystem's rpc_client.
6545  */
6546 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6547 {
6548         int status;
6549         struct nfs4_secinfo_arg args = {
6550                 .dir_fh = NFS_FH(dir),
6551                 .name   = name,
6552         };
6553         struct nfs4_secinfo_res res = {
6554                 .flavors     = flavors,
6555         };
6556         struct rpc_message msg = {
6557                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6558                 .rpc_argp = &args,
6559                 .rpc_resp = &res,
6560         };
6561         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6562         struct rpc_cred *cred = NULL;
6563
6564         if (use_integrity) {
6565                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6566                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6567                 msg.rpc_cred = cred;
6568         }
6569
6570         dprintk("NFS call  secinfo %s\n", name->name);
6571
6572         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6573                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6574
6575         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6576                                 &res.seq_res, 0);
6577         dprintk("NFS reply  secinfo: %d\n", status);
6578
6579         if (cred)
6580                 put_rpccred(cred);
6581
6582         return status;
6583 }
6584
6585 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6586                       struct nfs4_secinfo_flavors *flavors)
6587 {
6588         struct nfs4_exception exception = { };
6589         int err;
6590         do {
6591                 err = -NFS4ERR_WRONGSEC;
6592
6593                 /* try to use integrity protection with machine cred */
6594                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6595                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6596
6597                 /*
6598                  * if unable to use integrity protection, or SECINFO with
6599                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6600                  * disallowed by spec, but exists in deployed servers) use
6601                  * the current filesystem's rpc_client and the user cred.
6602                  */
6603                 if (err == -NFS4ERR_WRONGSEC)
6604                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6605
6606                 trace_nfs4_secinfo(dir, name, err);
6607                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6608                                 &exception);
6609         } while (exception.retry);
6610         return err;
6611 }
6612
6613 #ifdef CONFIG_NFS_V4_1
6614 /*
6615  * Check the exchange flags returned by the server for invalid flags, having
6616  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6617  * DS flags set.
6618  */
6619 static int nfs4_check_cl_exchange_flags(u32 flags)
6620 {
6621         if (flags & ~EXCHGID4_FLAG_MASK_R)
6622                 goto out_inval;
6623         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6624             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6625                 goto out_inval;
6626         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6627                 goto out_inval;
6628         return NFS_OK;
6629 out_inval:
6630         return -NFS4ERR_INVAL;
6631 }
6632
6633 static bool
6634 nfs41_same_server_scope(struct nfs41_server_scope *a,
6635                         struct nfs41_server_scope *b)
6636 {
6637         if (a->server_scope_sz == b->server_scope_sz &&
6638             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6639                 return true;
6640
6641         return false;
6642 }
6643
6644 /*
6645  * nfs4_proc_bind_conn_to_session()
6646  *
6647  * The 4.1 client currently uses the same TCP connection for the
6648  * fore and backchannel.
6649  */
6650 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6651 {
6652         int status;
6653         struct nfs41_bind_conn_to_session_args args = {
6654                 .client = clp,
6655                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
6656         };
6657         struct nfs41_bind_conn_to_session_res res;
6658         struct rpc_message msg = {
6659                 .rpc_proc =
6660                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6661                 .rpc_argp = &args,
6662                 .rpc_resp = &res,
6663                 .rpc_cred = cred,
6664         };
6665
6666         dprintk("--> %s\n", __func__);
6667
6668         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
6669         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
6670                 args.dir = NFS4_CDFC4_FORE;
6671
6672         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6673         trace_nfs4_bind_conn_to_session(clp, status);
6674         if (status == 0) {
6675                 if (memcmp(res.sessionid.data,
6676                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6677                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6678                         status = -EIO;
6679                         goto out;
6680                 }
6681                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
6682                         dprintk("NFS: %s: Unexpected direction from server\n",
6683                                 __func__);
6684                         status = -EIO;
6685                         goto out;
6686                 }
6687                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
6688                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6689                                 __func__);
6690                         status = -EIO;
6691                         goto out;
6692                 }
6693         }
6694 out:
6695         dprintk("<-- %s status= %d\n", __func__, status);
6696         return status;
6697 }
6698
6699 /*
6700  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6701  * and operations we'd like to see to enable certain features in the allow map
6702  */
6703 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6704         .how = SP4_MACH_CRED,
6705         .enforce.u.words = {
6706                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6707                       1 << (OP_EXCHANGE_ID - 32) |
6708                       1 << (OP_CREATE_SESSION - 32) |
6709                       1 << (OP_DESTROY_SESSION - 32) |
6710                       1 << (OP_DESTROY_CLIENTID - 32)
6711         },
6712         .allow.u.words = {
6713                 [0] = 1 << (OP_CLOSE) |
6714                       1 << (OP_LOCKU) |
6715                       1 << (OP_COMMIT),
6716                 [1] = 1 << (OP_SECINFO - 32) |
6717                       1 << (OP_SECINFO_NO_NAME - 32) |
6718                       1 << (OP_TEST_STATEID - 32) |
6719                       1 << (OP_FREE_STATEID - 32) |
6720                       1 << (OP_WRITE - 32)
6721         }
6722 };
6723
6724 /*
6725  * Select the state protection mode for client `clp' given the server results
6726  * from exchange_id in `sp'.
6727  *
6728  * Returns 0 on success, negative errno otherwise.
6729  */
6730 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6731                                  struct nfs41_state_protection *sp)
6732 {
6733         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6734                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6735                       1 << (OP_EXCHANGE_ID - 32) |
6736                       1 << (OP_CREATE_SESSION - 32) |
6737                       1 << (OP_DESTROY_SESSION - 32) |
6738                       1 << (OP_DESTROY_CLIENTID - 32)
6739         };
6740         unsigned int i;
6741
6742         if (sp->how == SP4_MACH_CRED) {
6743                 /* Print state protect result */
6744                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6745                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6746                         if (test_bit(i, sp->enforce.u.longs))
6747                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6748                         if (test_bit(i, sp->allow.u.longs))
6749                                 dfprintk(MOUNT, "  allow op %d\n", i);
6750                 }
6751
6752                 /* make sure nothing is on enforce list that isn't supported */
6753                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6754                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6755                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6756                                 return -EINVAL;
6757                         }
6758                 }
6759
6760                 /*
6761                  * Minimal mode - state operations are allowed to use machine
6762                  * credential.  Note this already happens by default, so the
6763                  * client doesn't have to do anything more than the negotiation.
6764                  *
6765                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6766                  *       we're already using the machine cred for exchange_id
6767                  *       and will never use a different cred.
6768                  */
6769                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6770                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6771                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6772                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6773                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6774                         dfprintk(MOUNT, "  minimal mode enabled\n");
6775                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6776                 } else {
6777                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6778                         return -EINVAL;
6779                 }
6780
6781                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6782                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6783                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6784                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6785                 }
6786
6787                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6788                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6789                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6790                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6791                 }
6792
6793                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6794                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6795                         dfprintk(MOUNT, "  stateid mode enabled\n");
6796                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6797                 }
6798
6799                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6800                         dfprintk(MOUNT, "  write mode enabled\n");
6801                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6802                 }
6803
6804                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6805                         dfprintk(MOUNT, "  commit mode enabled\n");
6806                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6807                 }
6808         }
6809
6810         return 0;
6811 }
6812
6813 /*
6814  * _nfs4_proc_exchange_id()
6815  *
6816  * Wrapper for EXCHANGE_ID operation.
6817  */
6818 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6819         u32 sp4_how)
6820 {
6821         nfs4_verifier verifier;
6822         struct nfs41_exchange_id_args args = {
6823                 .verifier = &verifier,
6824                 .client = clp,
6825 #ifdef CONFIG_NFS_V4_1_MIGRATION
6826                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6827                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6828                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6829 #else
6830                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6831                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6832 #endif
6833         };
6834         struct nfs41_exchange_id_res res = {
6835                 0
6836         };
6837         int status;
6838         struct rpc_message msg = {
6839                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6840                 .rpc_argp = &args,
6841                 .rpc_resp = &res,
6842                 .rpc_cred = cred,
6843         };
6844
6845         nfs4_init_boot_verifier(clp, &verifier);
6846         args.id_len = nfs4_init_uniform_client_string(clp, args.id,
6847                                                         sizeof(args.id));
6848         dprintk("NFS call  exchange_id auth=%s, '%.*s'\n",
6849                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6850                 args.id_len, args.id);
6851
6852         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6853                                         GFP_NOFS);
6854         if (unlikely(res.server_owner == NULL)) {
6855                 status = -ENOMEM;
6856                 goto out;
6857         }
6858
6859         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6860                                         GFP_NOFS);
6861         if (unlikely(res.server_scope == NULL)) {
6862                 status = -ENOMEM;
6863                 goto out_server_owner;
6864         }
6865
6866         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
6867         if (unlikely(res.impl_id == NULL)) {
6868                 status = -ENOMEM;
6869                 goto out_server_scope;
6870         }
6871
6872         switch (sp4_how) {
6873         case SP4_NONE:
6874                 args.state_protect.how = SP4_NONE;
6875                 break;
6876
6877         case SP4_MACH_CRED:
6878                 args.state_protect = nfs4_sp4_mach_cred_request;
6879                 break;
6880
6881         default:
6882                 /* unsupported! */
6883                 WARN_ON_ONCE(1);
6884                 status = -EINVAL;
6885                 goto out_server_scope;
6886         }
6887
6888         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6889         trace_nfs4_exchange_id(clp, status);
6890         if (status == 0)
6891                 status = nfs4_check_cl_exchange_flags(res.flags);
6892
6893         if (status == 0)
6894                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
6895
6896         if (status == 0) {
6897                 clp->cl_clientid = res.clientid;
6898                 clp->cl_exchange_flags = res.flags;
6899                 /* Client ID is not confirmed */
6900                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
6901                         clear_bit(NFS4_SESSION_ESTABLISHED,
6902                                         &clp->cl_session->session_state);
6903                         clp->cl_seqid = res.seqid;
6904                 }
6905
6906                 kfree(clp->cl_serverowner);
6907                 clp->cl_serverowner = res.server_owner;
6908                 res.server_owner = NULL;
6909
6910                 /* use the most recent implementation id */
6911                 kfree(clp->cl_implid);
6912                 clp->cl_implid = res.impl_id;
6913
6914                 if (clp->cl_serverscope != NULL &&
6915                     !nfs41_same_server_scope(clp->cl_serverscope,
6916                                              res.server_scope)) {
6917                         dprintk("%s: server_scope mismatch detected\n",
6918                                 __func__);
6919                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
6920                         kfree(clp->cl_serverscope);
6921                         clp->cl_serverscope = NULL;
6922                 }
6923
6924                 if (clp->cl_serverscope == NULL) {
6925                         clp->cl_serverscope = res.server_scope;
6926                         goto out;
6927                 }
6928         } else
6929                 kfree(res.impl_id);
6930
6931 out_server_owner:
6932         kfree(res.server_owner);
6933 out_server_scope:
6934         kfree(res.server_scope);
6935 out:
6936         if (clp->cl_implid != NULL)
6937                 dprintk("NFS reply exchange_id: Server Implementation ID: "
6938                         "domain: %s, name: %s, date: %llu,%u\n",
6939                         clp->cl_implid->domain, clp->cl_implid->name,
6940                         clp->cl_implid->date.seconds,
6941                         clp->cl_implid->date.nseconds);
6942         dprintk("NFS reply exchange_id: %d\n", status);
6943         return status;
6944 }
6945
6946 /*
6947  * nfs4_proc_exchange_id()
6948  *
6949  * Returns zero, a negative errno, or a negative NFS4ERR status code.
6950  *
6951  * Since the clientid has expired, all compounds using sessions
6952  * associated with the stale clientid will be returning
6953  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
6954  * be in some phase of session reset.
6955  *
6956  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
6957  */
6958 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
6959 {
6960         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
6961         int status;
6962
6963         /* try SP4_MACH_CRED if krb5i/p */
6964         if (authflavor == RPC_AUTH_GSS_KRB5I ||
6965             authflavor == RPC_AUTH_GSS_KRB5P) {
6966                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
6967                 if (!status)
6968                         return 0;
6969         }
6970
6971         /* try SP4_NONE */
6972         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
6973 }
6974
6975 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
6976                 struct rpc_cred *cred)
6977 {
6978         struct rpc_message msg = {
6979                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
6980                 .rpc_argp = clp,
6981                 .rpc_cred = cred,
6982         };
6983         int status;
6984
6985         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6986         trace_nfs4_destroy_clientid(clp, status);
6987         if (status)
6988                 dprintk("NFS: Got error %d from the server %s on "
6989                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
6990         return status;
6991 }
6992
6993 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
6994                 struct rpc_cred *cred)
6995 {
6996         unsigned int loop;
6997         int ret;
6998
6999         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
7000                 ret = _nfs4_proc_destroy_clientid(clp, cred);
7001                 switch (ret) {
7002                 case -NFS4ERR_DELAY:
7003                 case -NFS4ERR_CLIENTID_BUSY:
7004                         ssleep(1);
7005                         break;
7006                 default:
7007                         return ret;
7008                 }
7009         }
7010         return 0;
7011 }
7012
7013 int nfs4_destroy_clientid(struct nfs_client *clp)
7014 {
7015         struct rpc_cred *cred;
7016         int ret = 0;
7017
7018         if (clp->cl_mvops->minor_version < 1)
7019                 goto out;
7020         if (clp->cl_exchange_flags == 0)
7021                 goto out;
7022         if (clp->cl_preserve_clid)
7023                 goto out;
7024         cred = nfs4_get_clid_cred(clp);
7025         ret = nfs4_proc_destroy_clientid(clp, cred);
7026         if (cred)
7027                 put_rpccred(cred);
7028         switch (ret) {
7029         case 0:
7030         case -NFS4ERR_STALE_CLIENTID:
7031                 clp->cl_exchange_flags = 0;
7032         }
7033 out:
7034         return ret;
7035 }
7036
7037 struct nfs4_get_lease_time_data {
7038         struct nfs4_get_lease_time_args *args;
7039         struct nfs4_get_lease_time_res *res;
7040         struct nfs_client *clp;
7041 };
7042
7043 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7044                                         void *calldata)
7045 {
7046         struct nfs4_get_lease_time_data *data =
7047                         (struct nfs4_get_lease_time_data *)calldata;
7048
7049         dprintk("--> %s\n", __func__);
7050         /* just setup sequence, do not trigger session recovery
7051            since we're invoked within one */
7052         nfs41_setup_sequence(data->clp->cl_session,
7053                         &data->args->la_seq_args,
7054                         &data->res->lr_seq_res,
7055                         task);
7056         dprintk("<-- %s\n", __func__);
7057 }
7058
7059 /*
7060  * Called from nfs4_state_manager thread for session setup, so don't recover
7061  * from sequence operation or clientid errors.
7062  */
7063 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7064 {
7065         struct nfs4_get_lease_time_data *data =
7066                         (struct nfs4_get_lease_time_data *)calldata;
7067
7068         dprintk("--> %s\n", __func__);
7069         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7070                 return;
7071         switch (task->tk_status) {
7072         case -NFS4ERR_DELAY:
7073         case -NFS4ERR_GRACE:
7074                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7075                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7076                 task->tk_status = 0;
7077                 /* fall through */
7078         case -NFS4ERR_RETRY_UNCACHED_REP:
7079                 rpc_restart_call_prepare(task);
7080                 return;
7081         }
7082         dprintk("<-- %s\n", __func__);
7083 }
7084
7085 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7086         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7087         .rpc_call_done = nfs4_get_lease_time_done,
7088 };
7089
7090 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7091 {
7092         struct rpc_task *task;
7093         struct nfs4_get_lease_time_args args;
7094         struct nfs4_get_lease_time_res res = {
7095                 .lr_fsinfo = fsinfo,
7096         };
7097         struct nfs4_get_lease_time_data data = {
7098                 .args = &args,
7099                 .res = &res,
7100                 .clp = clp,
7101         };
7102         struct rpc_message msg = {
7103                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7104                 .rpc_argp = &args,
7105                 .rpc_resp = &res,
7106         };
7107         struct rpc_task_setup task_setup = {
7108                 .rpc_client = clp->cl_rpcclient,
7109                 .rpc_message = &msg,
7110                 .callback_ops = &nfs4_get_lease_time_ops,
7111                 .callback_data = &data,
7112                 .flags = RPC_TASK_TIMEOUT,
7113         };
7114         int status;
7115
7116         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7117         nfs4_set_sequence_privileged(&args.la_seq_args);
7118         dprintk("--> %s\n", __func__);
7119         task = rpc_run_task(&task_setup);
7120
7121         if (IS_ERR(task))
7122                 status = PTR_ERR(task);
7123         else {
7124                 status = task->tk_status;
7125                 rpc_put_task(task);
7126         }
7127         dprintk("<-- %s return %d\n", __func__, status);
7128
7129         return status;
7130 }
7131
7132 /*
7133  * Initialize the values to be used by the client in CREATE_SESSION
7134  * If nfs4_init_session set the fore channel request and response sizes,
7135  * use them.
7136  *
7137  * Set the back channel max_resp_sz_cached to zero to force the client to
7138  * always set csa_cachethis to FALSE because the current implementation
7139  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7140  */
7141 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7142 {
7143         unsigned int max_rqst_sz, max_resp_sz;
7144
7145         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7146         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7147
7148         /* Fore channel attributes */
7149         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7150         args->fc_attrs.max_resp_sz = max_resp_sz;
7151         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7152         args->fc_attrs.max_reqs = max_session_slots;
7153
7154         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7155                 "max_ops=%u max_reqs=%u\n",
7156                 __func__,
7157                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7158                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7159
7160         /* Back channel attributes */
7161         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7162         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7163         args->bc_attrs.max_resp_sz_cached = 0;
7164         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7165         args->bc_attrs.max_reqs = 1;
7166
7167         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7168                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7169                 __func__,
7170                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7171                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7172                 args->bc_attrs.max_reqs);
7173 }
7174
7175 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
7176                 struct nfs41_create_session_res *res)
7177 {
7178         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7179         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
7180
7181         if (rcvd->max_resp_sz > sent->max_resp_sz)
7182                 return -EINVAL;
7183         /*
7184          * Our requested max_ops is the minimum we need; we're not
7185          * prepared to break up compounds into smaller pieces than that.
7186          * So, no point even trying to continue if the server won't
7187          * cooperate:
7188          */
7189         if (rcvd->max_ops < sent->max_ops)
7190                 return -EINVAL;
7191         if (rcvd->max_reqs == 0)
7192                 return -EINVAL;
7193         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7194                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7195         return 0;
7196 }
7197
7198 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
7199                 struct nfs41_create_session_res *res)
7200 {
7201         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7202         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
7203
7204         if (!(res->flags & SESSION4_BACK_CHAN))
7205                 goto out;
7206         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7207                 return -EINVAL;
7208         if (rcvd->max_resp_sz < sent->max_resp_sz)
7209                 return -EINVAL;
7210         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7211                 return -EINVAL;
7212         /* These would render the backchannel useless: */
7213         if (rcvd->max_ops != sent->max_ops)
7214                 return -EINVAL;
7215         if (rcvd->max_reqs != sent->max_reqs)
7216                 return -EINVAL;
7217 out:
7218         return 0;
7219 }
7220
7221 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7222                                      struct nfs41_create_session_res *res)
7223 {
7224         int ret;
7225
7226         ret = nfs4_verify_fore_channel_attrs(args, res);
7227         if (ret)
7228                 return ret;
7229         return nfs4_verify_back_channel_attrs(args, res);
7230 }
7231
7232 static void nfs4_update_session(struct nfs4_session *session,
7233                 struct nfs41_create_session_res *res)
7234 {
7235         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
7236         /* Mark client id and session as being confirmed */
7237         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
7238         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
7239         session->flags = res->flags;
7240         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
7241         if (res->flags & SESSION4_BACK_CHAN)
7242                 memcpy(&session->bc_attrs, &res->bc_attrs,
7243                                 sizeof(session->bc_attrs));
7244 }
7245
7246 static int _nfs4_proc_create_session(struct nfs_client *clp,
7247                 struct rpc_cred *cred)
7248 {
7249         struct nfs4_session *session = clp->cl_session;
7250         struct nfs41_create_session_args args = {
7251                 .client = clp,
7252                 .clientid = clp->cl_clientid,
7253                 .seqid = clp->cl_seqid,
7254                 .cb_program = NFS4_CALLBACK,
7255         };
7256         struct nfs41_create_session_res res;
7257
7258         struct rpc_message msg = {
7259                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7260                 .rpc_argp = &args,
7261                 .rpc_resp = &res,
7262                 .rpc_cred = cred,
7263         };
7264         int status;
7265
7266         nfs4_init_channel_attrs(&args);
7267         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7268
7269         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7270         trace_nfs4_create_session(clp, status);
7271
7272         if (!status) {
7273                 /* Verify the session's negotiated channel_attrs values */
7274                 status = nfs4_verify_channel_attrs(&args, &res);
7275                 /* Increment the clientid slot sequence id */
7276                 if (clp->cl_seqid == res.seqid)
7277                         clp->cl_seqid++;
7278                 if (status)
7279                         goto out;
7280                 nfs4_update_session(session, &res);
7281         }
7282 out:
7283         return status;
7284 }
7285
7286 /*
7287  * Issues a CREATE_SESSION operation to the server.
7288  * It is the responsibility of the caller to verify the session is
7289  * expired before calling this routine.
7290  */
7291 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7292 {
7293         int status;
7294         unsigned *ptr;
7295         struct nfs4_session *session = clp->cl_session;
7296
7297         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7298
7299         status = _nfs4_proc_create_session(clp, cred);
7300         if (status)
7301                 goto out;
7302
7303         /* Init or reset the session slot tables */
7304         status = nfs4_setup_session_slot_tables(session);
7305         dprintk("slot table setup returned %d\n", status);
7306         if (status)
7307                 goto out;
7308
7309         ptr = (unsigned *)&session->sess_id.data[0];
7310         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7311                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7312 out:
7313         dprintk("<-- %s\n", __func__);
7314         return status;
7315 }
7316
7317 /*
7318  * Issue the over-the-wire RPC DESTROY_SESSION.
7319  * The caller must serialize access to this routine.
7320  */
7321 int nfs4_proc_destroy_session(struct nfs4_session *session,
7322                 struct rpc_cred *cred)
7323 {
7324         struct rpc_message msg = {
7325                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7326                 .rpc_argp = session,
7327                 .rpc_cred = cred,
7328         };
7329         int status = 0;
7330
7331         dprintk("--> nfs4_proc_destroy_session\n");
7332
7333         /* session is still being setup */
7334         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
7335                 return 0;
7336
7337         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7338         trace_nfs4_destroy_session(session->clp, status);
7339
7340         if (status)
7341                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7342                         "Session has been destroyed regardless...\n", status);
7343
7344         dprintk("<-- nfs4_proc_destroy_session\n");
7345         return status;
7346 }
7347
7348 /*
7349  * Renew the cl_session lease.
7350  */
7351 struct nfs4_sequence_data {
7352         struct nfs_client *clp;
7353         struct nfs4_sequence_args args;
7354         struct nfs4_sequence_res res;
7355 };
7356
7357 static void nfs41_sequence_release(void *data)
7358 {
7359         struct nfs4_sequence_data *calldata = data;
7360         struct nfs_client *clp = calldata->clp;
7361
7362         if (atomic_read(&clp->cl_count) > 1)
7363                 nfs4_schedule_state_renewal(clp);
7364         nfs_put_client(clp);
7365         kfree(calldata);
7366 }
7367
7368 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7369 {
7370         switch(task->tk_status) {
7371         case -NFS4ERR_DELAY:
7372                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7373                 return -EAGAIN;
7374         default:
7375                 nfs4_schedule_lease_recovery(clp);
7376         }
7377         return 0;
7378 }
7379
7380 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7381 {
7382         struct nfs4_sequence_data *calldata = data;
7383         struct nfs_client *clp = calldata->clp;
7384
7385         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7386                 return;
7387
7388         trace_nfs4_sequence(clp, task->tk_status);
7389         if (task->tk_status < 0) {
7390                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7391                 if (atomic_read(&clp->cl_count) == 1)
7392                         goto out;
7393
7394                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7395                         rpc_restart_call_prepare(task);
7396                         return;
7397                 }
7398         }
7399         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7400 out:
7401         dprintk("<-- %s\n", __func__);
7402 }
7403
7404 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7405 {
7406         struct nfs4_sequence_data *calldata = data;
7407         struct nfs_client *clp = calldata->clp;
7408         struct nfs4_sequence_args *args;
7409         struct nfs4_sequence_res *res;
7410
7411         args = task->tk_msg.rpc_argp;
7412         res = task->tk_msg.rpc_resp;
7413
7414         nfs41_setup_sequence(clp->cl_session, args, res, task);
7415 }
7416
7417 static const struct rpc_call_ops nfs41_sequence_ops = {
7418         .rpc_call_done = nfs41_sequence_call_done,
7419         .rpc_call_prepare = nfs41_sequence_prepare,
7420         .rpc_release = nfs41_sequence_release,
7421 };
7422
7423 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7424                 struct rpc_cred *cred,
7425                 bool is_privileged)
7426 {
7427         struct nfs4_sequence_data *calldata;
7428         struct rpc_message msg = {
7429                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7430                 .rpc_cred = cred,
7431         };
7432         struct rpc_task_setup task_setup_data = {
7433                 .rpc_client = clp->cl_rpcclient,
7434                 .rpc_message = &msg,
7435                 .callback_ops = &nfs41_sequence_ops,
7436                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7437         };
7438
7439         if (!atomic_inc_not_zero(&clp->cl_count))
7440                 return ERR_PTR(-EIO);
7441         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7442         if (calldata == NULL) {
7443                 nfs_put_client(clp);
7444                 return ERR_PTR(-ENOMEM);
7445         }
7446         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7447         if (is_privileged)
7448                 nfs4_set_sequence_privileged(&calldata->args);
7449         msg.rpc_argp = &calldata->args;
7450         msg.rpc_resp = &calldata->res;
7451         calldata->clp = clp;
7452         task_setup_data.callback_data = calldata;
7453
7454         return rpc_run_task(&task_setup_data);
7455 }
7456
7457 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7458 {
7459         struct rpc_task *task;
7460         int ret = 0;
7461
7462         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7463                 return -EAGAIN;
7464         task = _nfs41_proc_sequence(clp, cred, false);
7465         if (IS_ERR(task))
7466                 ret = PTR_ERR(task);
7467         else
7468                 rpc_put_task_async(task);
7469         dprintk("<-- %s status=%d\n", __func__, ret);
7470         return ret;
7471 }
7472
7473 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7474 {
7475         struct rpc_task *task;
7476         int ret;
7477
7478         task = _nfs41_proc_sequence(clp, cred, true);
7479         if (IS_ERR(task)) {
7480                 ret = PTR_ERR(task);
7481                 goto out;
7482         }
7483         ret = rpc_wait_for_completion_task(task);
7484         if (!ret) {
7485                 struct nfs4_sequence_res *res = task->tk_msg.rpc_resp;
7486
7487                 if (task->tk_status == 0)
7488                         nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
7489                 ret = task->tk_status;
7490         }
7491         rpc_put_task(task);
7492 out:
7493         dprintk("<-- %s status=%d\n", __func__, ret);
7494         return ret;
7495 }
7496
7497 struct nfs4_reclaim_complete_data {
7498         struct nfs_client *clp;
7499         struct nfs41_reclaim_complete_args arg;
7500         struct nfs41_reclaim_complete_res res;
7501 };
7502
7503 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7504 {
7505         struct nfs4_reclaim_complete_data *calldata = data;
7506
7507         nfs41_setup_sequence(calldata->clp->cl_session,
7508                         &calldata->arg.seq_args,
7509                         &calldata->res.seq_res,
7510                         task);
7511 }
7512
7513 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7514 {
7515         switch(task->tk_status) {
7516         case 0:
7517         case -NFS4ERR_COMPLETE_ALREADY:
7518         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7519                 break;
7520         case -NFS4ERR_DELAY:
7521                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7522                 /* fall through */
7523         case -NFS4ERR_RETRY_UNCACHED_REP:
7524                 return -EAGAIN;
7525         default:
7526                 nfs4_schedule_lease_recovery(clp);
7527         }
7528         return 0;
7529 }
7530
7531 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7532 {
7533         struct nfs4_reclaim_complete_data *calldata = data;
7534         struct nfs_client *clp = calldata->clp;
7535         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7536
7537         dprintk("--> %s\n", __func__);
7538         if (!nfs41_sequence_done(task, res))
7539                 return;
7540
7541         trace_nfs4_reclaim_complete(clp, task->tk_status);
7542         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7543                 rpc_restart_call_prepare(task);
7544                 return;
7545         }
7546         dprintk("<-- %s\n", __func__);
7547 }
7548
7549 static void nfs4_free_reclaim_complete_data(void *data)
7550 {
7551         struct nfs4_reclaim_complete_data *calldata = data;
7552
7553         kfree(calldata);
7554 }
7555
7556 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7557         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7558         .rpc_call_done = nfs4_reclaim_complete_done,
7559         .rpc_release = nfs4_free_reclaim_complete_data,
7560 };
7561
7562 /*
7563  * Issue a global reclaim complete.
7564  */
7565 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7566                 struct rpc_cred *cred)
7567 {
7568         struct nfs4_reclaim_complete_data *calldata;
7569         struct rpc_task *task;
7570         struct rpc_message msg = {
7571                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7572                 .rpc_cred = cred,
7573         };
7574         struct rpc_task_setup task_setup_data = {
7575                 .rpc_client = clp->cl_rpcclient,
7576                 .rpc_message = &msg,
7577                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7578                 .flags = RPC_TASK_ASYNC,
7579         };
7580         int status = -ENOMEM;
7581
7582         dprintk("--> %s\n", __func__);
7583         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7584         if (calldata == NULL)
7585                 goto out;
7586         calldata->clp = clp;
7587         calldata->arg.one_fs = 0;
7588
7589         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7590         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7591         msg.rpc_argp = &calldata->arg;
7592         msg.rpc_resp = &calldata->res;
7593         task_setup_data.callback_data = calldata;
7594         task = rpc_run_task(&task_setup_data);
7595         if (IS_ERR(task)) {
7596                 status = PTR_ERR(task);
7597                 goto out;
7598         }
7599         status = nfs4_wait_for_completion_rpc_task(task);
7600         if (status == 0)
7601                 status = task->tk_status;
7602         rpc_put_task(task);
7603         return 0;
7604 out:
7605         dprintk("<-- %s status=%d\n", __func__, status);
7606         return status;
7607 }
7608
7609 static void
7610 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7611 {
7612         struct nfs4_layoutget *lgp = calldata;
7613         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7614         struct nfs4_session *session = nfs4_get_session(server);
7615
7616         dprintk("--> %s\n", __func__);
7617         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7618          * right now covering the LAYOUTGET we are about to send.
7619          * However, that is not so catastrophic, and there seems
7620          * to be no way to prevent it completely.
7621          */
7622         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7623                                 &lgp->res.seq_res, task))
7624                 return;
7625         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7626                                           NFS_I(lgp->args.inode)->layout,
7627                                           &lgp->args.range,
7628                                           lgp->args.ctx->state)) {
7629                 rpc_exit(task, NFS4_OK);
7630         }
7631 }
7632
7633 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7634 {
7635         struct nfs4_layoutget *lgp = calldata;
7636         struct inode *inode = lgp->args.inode;
7637         struct nfs_server *server = NFS_SERVER(inode);
7638         struct pnfs_layout_hdr *lo;
7639         struct nfs4_state *state = NULL;
7640         unsigned long timeo, now, giveup;
7641
7642         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7643
7644         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7645                 goto out;
7646
7647         switch (task->tk_status) {
7648         case 0:
7649                 goto out;
7650         /*
7651          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7652          * (or clients) writing to the same RAID stripe
7653          */
7654         case -NFS4ERR_LAYOUTTRYLATER:
7655         /*
7656          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7657          * existing layout before getting a new one).
7658          */
7659         case -NFS4ERR_RECALLCONFLICT:
7660                 timeo = rpc_get_timeout(task->tk_client);
7661                 giveup = lgp->args.timestamp + timeo;
7662                 now = jiffies;
7663                 if (time_after(giveup, now)) {
7664                         unsigned long delay;
7665
7666                         /* Delay for:
7667                          * - Not less then NFS4_POLL_RETRY_MIN.
7668                          * - One last time a jiffie before we give up
7669                          * - exponential backoff (time_now minus start_attempt)
7670                          */
7671                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7672                                     min((giveup - now - 1),
7673                                         now - lgp->args.timestamp));
7674
7675                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7676                                 __func__, delay);
7677                         rpc_delay(task, delay);
7678                         task->tk_status = 0;
7679                         rpc_restart_call_prepare(task);
7680                         goto out; /* Do not call nfs4_async_handle_error() */
7681                 }
7682                 break;
7683         case -NFS4ERR_EXPIRED:
7684         case -NFS4ERR_BAD_STATEID:
7685                 spin_lock(&inode->i_lock);
7686                 lo = NFS_I(inode)->layout;
7687                 if (!lo || list_empty(&lo->plh_segs)) {
7688                         spin_unlock(&inode->i_lock);
7689                         /* If the open stateid was bad, then recover it. */
7690                         state = lgp->args.ctx->state;
7691                 } else {
7692                         LIST_HEAD(head);
7693
7694                         /*
7695                          * Mark the bad layout state as invalid, then retry
7696                          * with the current stateid.
7697                          */
7698                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7699                         spin_unlock(&inode->i_lock);
7700                         pnfs_free_lseg_list(&head);
7701
7702                         task->tk_status = 0;
7703                         rpc_restart_call_prepare(task);
7704                 }
7705         }
7706         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN)
7707                 rpc_restart_call_prepare(task);
7708 out:
7709         dprintk("<-- %s\n", __func__);
7710 }
7711
7712 static size_t max_response_pages(struct nfs_server *server)
7713 {
7714         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7715         return nfs_page_array_len(0, max_resp_sz);
7716 }
7717
7718 static void nfs4_free_pages(struct page **pages, size_t size)
7719 {
7720         int i;
7721
7722         if (!pages)
7723                 return;
7724
7725         for (i = 0; i < size; i++) {
7726                 if (!pages[i])
7727                         break;
7728                 __free_page(pages[i]);
7729         }
7730         kfree(pages);
7731 }
7732
7733 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7734 {
7735         struct page **pages;
7736         int i;
7737
7738         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7739         if (!pages) {
7740                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7741                 return NULL;
7742         }
7743
7744         for (i = 0; i < size; i++) {
7745                 pages[i] = alloc_page(gfp_flags);
7746                 if (!pages[i]) {
7747                         dprintk("%s: failed to allocate page\n", __func__);
7748                         nfs4_free_pages(pages, size);
7749                         return NULL;
7750                 }
7751         }
7752
7753         return pages;
7754 }
7755
7756 static void nfs4_layoutget_release(void *calldata)
7757 {
7758         struct nfs4_layoutget *lgp = calldata;
7759         struct inode *inode = lgp->args.inode;
7760         struct nfs_server *server = NFS_SERVER(inode);
7761         size_t max_pages = max_response_pages(server);
7762
7763         dprintk("--> %s\n", __func__);
7764         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7765         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7766         put_nfs_open_context(lgp->args.ctx);
7767         kfree(calldata);
7768         dprintk("<-- %s\n", __func__);
7769 }
7770
7771 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7772         .rpc_call_prepare = nfs4_layoutget_prepare,
7773         .rpc_call_done = nfs4_layoutget_done,
7774         .rpc_release = nfs4_layoutget_release,
7775 };
7776
7777 struct pnfs_layout_segment *
7778 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7779 {
7780         struct inode *inode = lgp->args.inode;
7781         struct nfs_server *server = NFS_SERVER(inode);
7782         size_t max_pages = max_response_pages(server);
7783         struct rpc_task *task;
7784         struct rpc_message msg = {
7785                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7786                 .rpc_argp = &lgp->args,
7787                 .rpc_resp = &lgp->res,
7788                 .rpc_cred = lgp->cred,
7789         };
7790         struct rpc_task_setup task_setup_data = {
7791                 .rpc_client = server->client,
7792                 .rpc_message = &msg,
7793                 .callback_ops = &nfs4_layoutget_call_ops,
7794                 .callback_data = lgp,
7795                 .flags = RPC_TASK_ASYNC,
7796         };
7797         struct pnfs_layout_segment *lseg = NULL;
7798         int status = 0;
7799
7800         dprintk("--> %s\n", __func__);
7801
7802         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7803         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7804
7805         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7806         if (!lgp->args.layout.pages) {
7807                 nfs4_layoutget_release(lgp);
7808                 return ERR_PTR(-ENOMEM);
7809         }
7810         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7811         lgp->args.timestamp = jiffies;
7812
7813         lgp->res.layoutp = &lgp->args.layout;
7814         lgp->res.seq_res.sr_slot = NULL;
7815         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7816
7817         task = rpc_run_task(&task_setup_data);
7818         if (IS_ERR(task))
7819                 return ERR_CAST(task);
7820         status = nfs4_wait_for_completion_rpc_task(task);
7821         if (status == 0)
7822                 status = task->tk_status;
7823         trace_nfs4_layoutget(lgp->args.ctx,
7824                         &lgp->args.range,
7825                         &lgp->res.range,
7826                         status);
7827         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7828         if (status == 0 && lgp->res.layoutp->len)
7829                 lseg = pnfs_layout_process(lgp);
7830         rpc_put_task(task);
7831         dprintk("<-- %s status=%d\n", __func__, status);
7832         if (status)
7833                 return ERR_PTR(status);
7834         return lseg;
7835 }
7836
7837 static void
7838 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7839 {
7840         struct nfs4_layoutreturn *lrp = calldata;
7841
7842         dprintk("--> %s\n", __func__);
7843         nfs41_setup_sequence(lrp->clp->cl_session,
7844                         &lrp->args.seq_args,
7845                         &lrp->res.seq_res,
7846                         task);
7847 }
7848
7849 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
7850 {
7851         struct nfs4_layoutreturn *lrp = calldata;
7852         struct nfs_server *server;
7853
7854         dprintk("--> %s\n", __func__);
7855
7856         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
7857                 return;
7858
7859         server = NFS_SERVER(lrp->args.inode);
7860         switch (task->tk_status) {
7861         default:
7862                 task->tk_status = 0;
7863         case 0:
7864                 break;
7865         case -NFS4ERR_DELAY:
7866                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
7867                         break;
7868                 rpc_restart_call_prepare(task);
7869                 return;
7870         }
7871         dprintk("<-- %s\n", __func__);
7872 }
7873
7874 static void nfs4_layoutreturn_release(void *calldata)
7875 {
7876         struct nfs4_layoutreturn *lrp = calldata;
7877         struct pnfs_layout_hdr *lo = lrp->args.layout;
7878
7879         dprintk("--> %s\n", __func__);
7880         spin_lock(&lo->plh_inode->i_lock);
7881         if (lrp->res.lrs_present)
7882                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
7883         pnfs_clear_layoutreturn_waitbit(lo);
7884         clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, &lo->plh_flags);
7885         rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq);
7886         lo->plh_block_lgets--;
7887         spin_unlock(&lo->plh_inode->i_lock);
7888         pnfs_put_layout_hdr(lrp->args.layout);
7889         nfs_iput_and_deactive(lrp->inode);
7890         kfree(calldata);
7891         dprintk("<-- %s\n", __func__);
7892 }
7893
7894 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
7895         .rpc_call_prepare = nfs4_layoutreturn_prepare,
7896         .rpc_call_done = nfs4_layoutreturn_done,
7897         .rpc_release = nfs4_layoutreturn_release,
7898 };
7899
7900 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
7901 {
7902         struct rpc_task *task;
7903         struct rpc_message msg = {
7904                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
7905                 .rpc_argp = &lrp->args,
7906                 .rpc_resp = &lrp->res,
7907                 .rpc_cred = lrp->cred,
7908         };
7909         struct rpc_task_setup task_setup_data = {
7910                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
7911                 .rpc_message = &msg,
7912                 .callback_ops = &nfs4_layoutreturn_call_ops,
7913                 .callback_data = lrp,
7914         };
7915         int status = 0;
7916
7917         dprintk("--> %s\n", __func__);
7918         if (!sync) {
7919                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
7920                 if (!lrp->inode) {
7921                         nfs4_layoutreturn_release(lrp);
7922                         return -EAGAIN;
7923                 }
7924                 task_setup_data.flags |= RPC_TASK_ASYNC;
7925         }
7926         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
7927         task = rpc_run_task(&task_setup_data);
7928         if (IS_ERR(task))
7929                 return PTR_ERR(task);
7930         if (sync)
7931                 status = task->tk_status;
7932         trace_nfs4_layoutreturn(lrp->args.inode, status);
7933         dprintk("<-- %s status=%d\n", __func__, status);
7934         rpc_put_task(task);
7935         return status;
7936 }
7937
7938 static int
7939 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
7940                 struct pnfs_device *pdev,
7941                 struct rpc_cred *cred)
7942 {
7943         struct nfs4_getdeviceinfo_args args = {
7944                 .pdev = pdev,
7945                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
7946                         NOTIFY_DEVICEID4_DELETE,
7947         };
7948         struct nfs4_getdeviceinfo_res res = {
7949                 .pdev = pdev,
7950         };
7951         struct rpc_message msg = {
7952                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
7953                 .rpc_argp = &args,
7954                 .rpc_resp = &res,
7955                 .rpc_cred = cred,
7956         };
7957         int status;
7958
7959         dprintk("--> %s\n", __func__);
7960         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
7961         if (res.notification & ~args.notify_types)
7962                 dprintk("%s: unsupported notification\n", __func__);
7963         if (res.notification != args.notify_types)
7964                 pdev->nocache = 1;
7965
7966         dprintk("<-- %s status=%d\n", __func__, status);
7967
7968         return status;
7969 }
7970
7971 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
7972                 struct pnfs_device *pdev,
7973                 struct rpc_cred *cred)
7974 {
7975         struct nfs4_exception exception = { };
7976         int err;
7977
7978         do {
7979                 err = nfs4_handle_exception(server,
7980                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
7981                                         &exception);
7982         } while (exception.retry);
7983         return err;
7984 }
7985 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
7986
7987 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
7988 {
7989         struct nfs4_layoutcommit_data *data = calldata;
7990         struct nfs_server *server = NFS_SERVER(data->args.inode);
7991         struct nfs4_session *session = nfs4_get_session(server);
7992
7993         nfs41_setup_sequence(session,
7994                         &data->args.seq_args,
7995                         &data->res.seq_res,
7996                         task);
7997 }
7998
7999 static void
8000 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
8001 {
8002         struct nfs4_layoutcommit_data *data = calldata;
8003         struct nfs_server *server = NFS_SERVER(data->args.inode);
8004
8005         if (!nfs41_sequence_done(task, &data->res.seq_res))
8006                 return;
8007
8008         switch (task->tk_status) { /* Just ignore these failures */
8009         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
8010         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
8011         case -NFS4ERR_BADLAYOUT:     /* no layout */
8012         case -NFS4ERR_GRACE:        /* loca_recalim always false */
8013                 task->tk_status = 0;
8014         case 0:
8015                 break;
8016         default:
8017                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
8018                         rpc_restart_call_prepare(task);
8019                         return;
8020                 }
8021         }
8022 }
8023
8024 static void nfs4_layoutcommit_release(void *calldata)
8025 {
8026         struct nfs4_layoutcommit_data *data = calldata;
8027
8028         pnfs_cleanup_layoutcommit(data);
8029         nfs_post_op_update_inode_force_wcc(data->args.inode,
8030                                            data->res.fattr);
8031         put_rpccred(data->cred);
8032         nfs_iput_and_deactive(data->inode);
8033         kfree(data);
8034 }
8035
8036 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
8037         .rpc_call_prepare = nfs4_layoutcommit_prepare,
8038         .rpc_call_done = nfs4_layoutcommit_done,
8039         .rpc_release = nfs4_layoutcommit_release,
8040 };
8041
8042 int
8043 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
8044 {
8045         struct rpc_message msg = {
8046                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
8047                 .rpc_argp = &data->args,
8048                 .rpc_resp = &data->res,
8049                 .rpc_cred = data->cred,
8050         };
8051         struct rpc_task_setup task_setup_data = {
8052                 .task = &data->task,
8053                 .rpc_client = NFS_CLIENT(data->args.inode),
8054                 .rpc_message = &msg,
8055                 .callback_ops = &nfs4_layoutcommit_ops,
8056                 .callback_data = data,
8057         };
8058         struct rpc_task *task;
8059         int status = 0;
8060
8061         dprintk("NFS: %4d initiating layoutcommit call. sync %d "
8062                 "lbw: %llu inode %lu\n",
8063                 data->task.tk_pid, sync,
8064                 data->args.lastbytewritten,
8065                 data->args.inode->i_ino);
8066
8067         if (!sync) {
8068                 data->inode = nfs_igrab_and_active(data->args.inode);
8069                 if (data->inode == NULL) {
8070                         nfs4_layoutcommit_release(data);
8071                         return -EAGAIN;
8072                 }
8073                 task_setup_data.flags = RPC_TASK_ASYNC;
8074         }
8075         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8076         task = rpc_run_task(&task_setup_data);
8077         if (IS_ERR(task))
8078                 return PTR_ERR(task);
8079         if (sync)
8080                 status = task->tk_status;
8081         trace_nfs4_layoutcommit(data->args.inode, status);
8082         dprintk("%s: status %d\n", __func__, status);
8083         rpc_put_task(task);
8084         return status;
8085 }
8086
8087 /**
8088  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8089  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8090  */
8091 static int
8092 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8093                     struct nfs_fsinfo *info,
8094                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8095 {
8096         struct nfs41_secinfo_no_name_args args = {
8097                 .style = SECINFO_STYLE_CURRENT_FH,
8098         };
8099         struct nfs4_secinfo_res res = {
8100                 .flavors = flavors,
8101         };
8102         struct rpc_message msg = {
8103                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8104                 .rpc_argp = &args,
8105                 .rpc_resp = &res,
8106         };
8107         struct rpc_clnt *clnt = server->client;
8108         struct rpc_cred *cred = NULL;
8109         int status;
8110
8111         if (use_integrity) {
8112                 clnt = server->nfs_client->cl_rpcclient;
8113                 cred = nfs4_get_clid_cred(server->nfs_client);
8114                 msg.rpc_cred = cred;
8115         }
8116
8117         dprintk("--> %s\n", __func__);
8118         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8119                                 &res.seq_res, 0);
8120         dprintk("<-- %s status=%d\n", __func__, status);
8121
8122         if (cred)
8123                 put_rpccred(cred);
8124
8125         return status;
8126 }
8127
8128 static int
8129 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8130                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8131 {
8132         struct nfs4_exception exception = { };
8133         int err;
8134         do {
8135                 /* first try using integrity protection */
8136                 err = -NFS4ERR_WRONGSEC;
8137
8138                 /* try to use integrity protection with machine cred */
8139                 if (_nfs4_is_integrity_protected(server->nfs_client))
8140                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8141                                                           flavors, true);
8142
8143                 /*
8144                  * if unable to use integrity protection, or SECINFO with
8145                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8146                  * disallowed by spec, but exists in deployed servers) use
8147                  * the current filesystem's rpc_client and the user cred.
8148                  */
8149                 if (err == -NFS4ERR_WRONGSEC)
8150                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8151                                                           flavors, false);
8152
8153                 switch (err) {
8154                 case 0:
8155                 case -NFS4ERR_WRONGSEC:
8156                 case -ENOTSUPP:
8157                         goto out;
8158                 default:
8159                         err = nfs4_handle_exception(server, err, &exception);
8160                 }
8161         } while (exception.retry);
8162 out:
8163         return err;
8164 }
8165
8166 static int
8167 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8168                     struct nfs_fsinfo *info)
8169 {
8170         int err;
8171         struct page *page;
8172         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8173         struct nfs4_secinfo_flavors *flavors;
8174         struct nfs4_secinfo4 *secinfo;
8175         int i;
8176
8177         page = alloc_page(GFP_KERNEL);
8178         if (!page) {
8179                 err = -ENOMEM;
8180                 goto out;
8181         }
8182
8183         flavors = page_address(page);
8184         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8185
8186         /*
8187          * Fall back on "guess and check" method if
8188          * the server doesn't support SECINFO_NO_NAME
8189          */
8190         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8191                 err = nfs4_find_root_sec(server, fhandle, info);
8192                 goto out_freepage;
8193         }
8194         if (err)
8195                 goto out_freepage;
8196
8197         for (i = 0; i < flavors->num_flavors; i++) {
8198                 secinfo = &flavors->flavors[i];
8199
8200                 switch (secinfo->flavor) {
8201                 case RPC_AUTH_NULL:
8202                 case RPC_AUTH_UNIX:
8203                 case RPC_AUTH_GSS:
8204                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8205                                         &secinfo->flavor_info);
8206                         break;
8207                 default:
8208                         flavor = RPC_AUTH_MAXFLAVOR;
8209                         break;
8210                 }
8211
8212                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8213                         flavor = RPC_AUTH_MAXFLAVOR;
8214
8215                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8216                         err = nfs4_lookup_root_sec(server, fhandle,
8217                                                    info, flavor);
8218                         if (!err)
8219                                 break;
8220                 }
8221         }
8222
8223         if (flavor == RPC_AUTH_MAXFLAVOR)
8224                 err = -EPERM;
8225
8226 out_freepage:
8227         put_page(page);
8228         if (err == -EACCES)
8229                 return -EPERM;
8230 out:
8231         return err;
8232 }
8233
8234 static int _nfs41_test_stateid(struct nfs_server *server,
8235                 nfs4_stateid *stateid,
8236                 struct rpc_cred *cred)
8237 {
8238         int status;
8239         struct nfs41_test_stateid_args args = {
8240                 .stateid = stateid,
8241         };
8242         struct nfs41_test_stateid_res res;
8243         struct rpc_message msg = {
8244                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8245                 .rpc_argp = &args,
8246                 .rpc_resp = &res,
8247                 .rpc_cred = cred,
8248         };
8249         struct rpc_clnt *rpc_client = server->client;
8250
8251         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8252                 &rpc_client, &msg);
8253
8254         dprintk("NFS call  test_stateid %p\n", stateid);
8255         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8256         nfs4_set_sequence_privileged(&args.seq_args);
8257         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8258                         &args.seq_args, &res.seq_res);
8259         if (status != NFS_OK) {
8260                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8261                 return status;
8262         }
8263         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8264         return -res.status;
8265 }
8266
8267 /**
8268  * nfs41_test_stateid - perform a TEST_STATEID operation
8269  *
8270  * @server: server / transport on which to perform the operation
8271  * @stateid: state ID to test
8272  * @cred: credential
8273  *
8274  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8275  * Otherwise a negative NFS4ERR value is returned if the operation
8276  * failed or the state ID is not currently valid.
8277  */
8278 static int nfs41_test_stateid(struct nfs_server *server,
8279                 nfs4_stateid *stateid,
8280                 struct rpc_cred *cred)
8281 {
8282         struct nfs4_exception exception = { };
8283         int err;
8284         do {
8285                 err = _nfs41_test_stateid(server, stateid, cred);
8286                 if (err != -NFS4ERR_DELAY)
8287                         break;
8288                 nfs4_handle_exception(server, err, &exception);
8289         } while (exception.retry);
8290         return err;
8291 }
8292
8293 struct nfs_free_stateid_data {
8294         struct nfs_server *server;
8295         struct nfs41_free_stateid_args args;
8296         struct nfs41_free_stateid_res res;
8297 };
8298
8299 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8300 {
8301         struct nfs_free_stateid_data *data = calldata;
8302         nfs41_setup_sequence(nfs4_get_session(data->server),
8303                         &data->args.seq_args,
8304                         &data->res.seq_res,
8305                         task);
8306 }
8307
8308 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8309 {
8310         struct nfs_free_stateid_data *data = calldata;
8311
8312         nfs41_sequence_done(task, &data->res.seq_res);
8313
8314         switch (task->tk_status) {
8315         case -NFS4ERR_DELAY:
8316                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8317                         rpc_restart_call_prepare(task);
8318         }
8319 }
8320
8321 static void nfs41_free_stateid_release(void *calldata)
8322 {
8323         kfree(calldata);
8324 }
8325
8326 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8327         .rpc_call_prepare = nfs41_free_stateid_prepare,
8328         .rpc_call_done = nfs41_free_stateid_done,
8329         .rpc_release = nfs41_free_stateid_release,
8330 };
8331
8332 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8333                 nfs4_stateid *stateid,
8334                 struct rpc_cred *cred,
8335                 bool privileged)
8336 {
8337         struct rpc_message msg = {
8338                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8339                 .rpc_cred = cred,
8340         };
8341         struct rpc_task_setup task_setup = {
8342                 .rpc_client = server->client,
8343                 .rpc_message = &msg,
8344                 .callback_ops = &nfs41_free_stateid_ops,
8345                 .flags = RPC_TASK_ASYNC,
8346         };
8347         struct nfs_free_stateid_data *data;
8348
8349         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8350                 &task_setup.rpc_client, &msg);
8351
8352         dprintk("NFS call  free_stateid %p\n", stateid);
8353         data = kmalloc(sizeof(*data), GFP_NOFS);
8354         if (!data)
8355                 return ERR_PTR(-ENOMEM);
8356         data->server = server;
8357         nfs4_stateid_copy(&data->args.stateid, stateid);
8358
8359         task_setup.callback_data = data;
8360
8361         msg.rpc_argp = &data->args;
8362         msg.rpc_resp = &data->res;
8363         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8364         if (privileged)
8365                 nfs4_set_sequence_privileged(&data->args.seq_args);
8366
8367         return rpc_run_task(&task_setup);
8368 }
8369
8370 /**
8371  * nfs41_free_stateid - perform a FREE_STATEID operation
8372  *
8373  * @server: server / transport on which to perform the operation
8374  * @stateid: state ID to release
8375  * @cred: credential
8376  *
8377  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8378  * negative NFS4ERR value is returned.
8379  */
8380 static int nfs41_free_stateid(struct nfs_server *server,
8381                 nfs4_stateid *stateid,
8382                 struct rpc_cred *cred)
8383 {
8384         struct rpc_task *task;
8385         int ret;
8386
8387         task = _nfs41_free_stateid(server, stateid, cred, true);
8388         if (IS_ERR(task))
8389                 return PTR_ERR(task);
8390         ret = rpc_wait_for_completion_task(task);
8391         if (!ret)
8392                 ret = task->tk_status;
8393         rpc_put_task(task);
8394         return ret;
8395 }
8396
8397 static void
8398 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8399 {
8400         struct rpc_task *task;
8401         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8402
8403         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8404         nfs4_free_lock_state(server, lsp);
8405         if (IS_ERR(task))
8406                 return;
8407         rpc_put_task(task);
8408 }
8409
8410 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8411                 const nfs4_stateid *s2)
8412 {
8413         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8414                 return false;
8415
8416         if (s1->seqid == s2->seqid)
8417                 return true;
8418         if (s1->seqid == 0 || s2->seqid == 0)
8419                 return true;
8420
8421         return false;
8422 }
8423
8424 #endif /* CONFIG_NFS_V4_1 */
8425
8426 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8427                 const nfs4_stateid *s2)
8428 {
8429         return nfs4_stateid_match(s1, s2);
8430 }
8431
8432
8433 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8434         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8435         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8436         .recover_open   = nfs4_open_reclaim,
8437         .recover_lock   = nfs4_lock_reclaim,
8438         .establish_clid = nfs4_init_clientid,
8439         .detect_trunking = nfs40_discover_server_trunking,
8440 };
8441
8442 #if defined(CONFIG_NFS_V4_1)
8443 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8444         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8445         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8446         .recover_open   = nfs4_open_reclaim,
8447         .recover_lock   = nfs4_lock_reclaim,
8448         .establish_clid = nfs41_init_clientid,
8449         .reclaim_complete = nfs41_proc_reclaim_complete,
8450         .detect_trunking = nfs41_discover_server_trunking,
8451 };
8452 #endif /* CONFIG_NFS_V4_1 */
8453
8454 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8455         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8456         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8457         .recover_open   = nfs40_open_expired,
8458         .recover_lock   = nfs4_lock_expired,
8459         .establish_clid = nfs4_init_clientid,
8460 };
8461
8462 #if defined(CONFIG_NFS_V4_1)
8463 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8464         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8465         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8466         .recover_open   = nfs41_open_expired,
8467         .recover_lock   = nfs41_lock_expired,
8468         .establish_clid = nfs41_init_clientid,
8469 };
8470 #endif /* CONFIG_NFS_V4_1 */
8471
8472 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8473         .sched_state_renewal = nfs4_proc_async_renew,
8474         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8475         .renew_lease = nfs4_proc_renew,
8476 };
8477
8478 #if defined(CONFIG_NFS_V4_1)
8479 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8480         .sched_state_renewal = nfs41_proc_async_sequence,
8481         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8482         .renew_lease = nfs4_proc_sequence,
8483 };
8484 #endif
8485
8486 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8487         .get_locations = _nfs40_proc_get_locations,
8488         .fsid_present = _nfs40_proc_fsid_present,
8489 };
8490
8491 #if defined(CONFIG_NFS_V4_1)
8492 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8493         .get_locations = _nfs41_proc_get_locations,
8494         .fsid_present = _nfs41_proc_fsid_present,
8495 };
8496 #endif  /* CONFIG_NFS_V4_1 */
8497
8498 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8499         .minor_version = 0,
8500         .init_caps = NFS_CAP_READDIRPLUS
8501                 | NFS_CAP_ATOMIC_OPEN
8502                 | NFS_CAP_CHANGE_ATTR
8503                 | NFS_CAP_POSIX_LOCK,
8504         .init_client = nfs40_init_client,
8505         .shutdown_client = nfs40_shutdown_client,
8506         .match_stateid = nfs4_match_stateid,
8507         .find_root_sec = nfs4_find_root_sec,
8508         .free_lock_state = nfs4_release_lockowner,
8509         .alloc_seqid = nfs_alloc_seqid,
8510         .call_sync_ops = &nfs40_call_sync_ops,
8511         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8512         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8513         .state_renewal_ops = &nfs40_state_renewal_ops,
8514         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8515 };
8516
8517 #if defined(CONFIG_NFS_V4_1)
8518 static struct nfs_seqid *
8519 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
8520 {
8521         return NULL;
8522 }
8523
8524 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8525         .minor_version = 1,
8526         .init_caps = NFS_CAP_READDIRPLUS
8527                 | NFS_CAP_ATOMIC_OPEN
8528                 | NFS_CAP_CHANGE_ATTR
8529                 | NFS_CAP_POSIX_LOCK
8530                 | NFS_CAP_STATEID_NFSV41
8531                 | NFS_CAP_ATOMIC_OPEN_V1,
8532         .init_client = nfs41_init_client,
8533         .shutdown_client = nfs41_shutdown_client,
8534         .match_stateid = nfs41_match_stateid,
8535         .find_root_sec = nfs41_find_root_sec,
8536         .free_lock_state = nfs41_free_lock_state,
8537         .alloc_seqid = nfs_alloc_no_seqid,
8538         .call_sync_ops = &nfs41_call_sync_ops,
8539         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8540         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8541         .state_renewal_ops = &nfs41_state_renewal_ops,
8542         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8543 };
8544 #endif
8545
8546 #if defined(CONFIG_NFS_V4_2)
8547 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8548         .minor_version = 2,
8549         .init_caps = NFS_CAP_READDIRPLUS
8550                 | NFS_CAP_ATOMIC_OPEN
8551                 | NFS_CAP_CHANGE_ATTR
8552                 | NFS_CAP_POSIX_LOCK
8553                 | NFS_CAP_STATEID_NFSV41
8554                 | NFS_CAP_ATOMIC_OPEN_V1
8555                 | NFS_CAP_ALLOCATE
8556                 | NFS_CAP_DEALLOCATE
8557                 | NFS_CAP_SEEK,
8558         .init_client = nfs41_init_client,
8559         .shutdown_client = nfs41_shutdown_client,
8560         .match_stateid = nfs41_match_stateid,
8561         .find_root_sec = nfs41_find_root_sec,
8562         .free_lock_state = nfs41_free_lock_state,
8563         .call_sync_ops = &nfs41_call_sync_ops,
8564         .alloc_seqid = nfs_alloc_no_seqid,
8565         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8566         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8567         .state_renewal_ops = &nfs41_state_renewal_ops,
8568 };
8569 #endif
8570
8571 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8572         [0] = &nfs_v4_0_minor_ops,
8573 #if defined(CONFIG_NFS_V4_1)
8574         [1] = &nfs_v4_1_minor_ops,
8575 #endif
8576 #if defined(CONFIG_NFS_V4_2)
8577         [2] = &nfs_v4_2_minor_ops,
8578 #endif
8579 };
8580
8581 static const struct inode_operations nfs4_dir_inode_operations = {
8582         .create         = nfs_create,
8583         .lookup         = nfs_lookup,
8584         .atomic_open    = nfs_atomic_open,
8585         .link           = nfs_link,
8586         .unlink         = nfs_unlink,
8587         .symlink        = nfs_symlink,
8588         .mkdir          = nfs_mkdir,
8589         .rmdir          = nfs_rmdir,
8590         .mknod          = nfs_mknod,
8591         .rename         = nfs_rename,
8592         .permission     = nfs_permission,
8593         .getattr        = nfs_getattr,
8594         .setattr        = nfs_setattr,
8595         .getxattr       = generic_getxattr,
8596         .setxattr       = generic_setxattr,
8597         .listxattr      = generic_listxattr,
8598         .removexattr    = generic_removexattr,
8599 };
8600
8601 static const struct inode_operations nfs4_file_inode_operations = {
8602         .permission     = nfs_permission,
8603         .getattr        = nfs_getattr,
8604         .setattr        = nfs_setattr,
8605         .getxattr       = generic_getxattr,
8606         .setxattr       = generic_setxattr,
8607         .listxattr      = generic_listxattr,
8608         .removexattr    = generic_removexattr,
8609 };
8610
8611 const struct nfs_rpc_ops nfs_v4_clientops = {
8612         .version        = 4,                    /* protocol version */
8613         .dentry_ops     = &nfs4_dentry_operations,
8614         .dir_inode_ops  = &nfs4_dir_inode_operations,
8615         .file_inode_ops = &nfs4_file_inode_operations,
8616         .file_ops       = &nfs4_file_operations,
8617         .getroot        = nfs4_proc_get_root,
8618         .submount       = nfs4_submount,
8619         .try_mount      = nfs4_try_mount,
8620         .getattr        = nfs4_proc_getattr,
8621         .setattr        = nfs4_proc_setattr,
8622         .lookup         = nfs4_proc_lookup,
8623         .access         = nfs4_proc_access,
8624         .readlink       = nfs4_proc_readlink,
8625         .create         = nfs4_proc_create,
8626         .remove         = nfs4_proc_remove,
8627         .unlink_setup   = nfs4_proc_unlink_setup,
8628         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8629         .unlink_done    = nfs4_proc_unlink_done,
8630         .rename_setup   = nfs4_proc_rename_setup,
8631         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8632         .rename_done    = nfs4_proc_rename_done,
8633         .link           = nfs4_proc_link,
8634         .symlink        = nfs4_proc_symlink,
8635         .mkdir          = nfs4_proc_mkdir,
8636         .rmdir          = nfs4_proc_remove,
8637         .readdir        = nfs4_proc_readdir,
8638         .mknod          = nfs4_proc_mknod,
8639         .statfs         = nfs4_proc_statfs,
8640         .fsinfo         = nfs4_proc_fsinfo,
8641         .pathconf       = nfs4_proc_pathconf,
8642         .set_capabilities = nfs4_server_capabilities,
8643         .decode_dirent  = nfs4_decode_dirent,
8644         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8645         .read_setup     = nfs4_proc_read_setup,
8646         .read_done      = nfs4_read_done,
8647         .write_setup    = nfs4_proc_write_setup,
8648         .write_done     = nfs4_write_done,
8649         .commit_setup   = nfs4_proc_commit_setup,
8650         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8651         .commit_done    = nfs4_commit_done,
8652         .lock           = nfs4_proc_lock,
8653         .clear_acl_cache = nfs4_zap_acl_attr,
8654         .close_context  = nfs4_close_context,
8655         .open_context   = nfs4_atomic_open,
8656         .have_delegation = nfs4_have_delegation,
8657         .return_delegation = nfs4_inode_return_delegation,
8658         .alloc_client   = nfs4_alloc_client,
8659         .init_client    = nfs4_init_client,
8660         .free_client    = nfs4_free_client,
8661         .create_server  = nfs4_create_server,
8662         .clone_server   = nfs_clone_server,
8663 };
8664
8665 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8666         .prefix = XATTR_NAME_NFSV4_ACL,
8667         .list   = nfs4_xattr_list_nfs4_acl,
8668         .get    = nfs4_xattr_get_nfs4_acl,
8669         .set    = nfs4_xattr_set_nfs4_acl,
8670 };
8671
8672 const struct xattr_handler *nfs4_xattr_handlers[] = {
8673         &nfs4_xattr_nfs4_acl_handler,
8674 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8675         &nfs4_xattr_nfs4_label_handler,
8676 #endif
8677         NULL
8678 };
8679
8680 /*
8681  * Local variables:
8682  *  c-basic-offset: 8
8683  * End:
8684  */