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/file.h>
  42 #include <linux/string.h>
  43 #include <linux/ratelimit.h>
  44 #include <linux/printk.h>
  45 #include <linux/slab.h>
  46 #include <linux/sunrpc/clnt.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4idmap.h"
  67 #include "nfs4session.h"
  68 #include "fscache.h"
  69
  70 #include "nfs4trace.h"
  71
  72 #define NFSDBG_FACILITY         NFSDBG_PROC
  73
  74 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  75 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  76
  77 struct nfs4_opendata;
  78 static int _nfs4_proc_open(struct nfs4_opendata *data);
  79 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  80 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  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 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 212         | FATTR4_WORD2_SECURITY_LABEL
 213 #endif
 214 };
 215
 216 static const u32 nfs4_open_noattr_bitmap[3] = {
 217         FATTR4_WORD0_TYPE
 218         | FATTR4_WORD0_CHANGE
 219         | FATTR4_WORD0_FILEID,
 220 };
 221
 222 const u32 nfs4_statfs_bitmap[3] = {
 223         FATTR4_WORD0_FILES_AVAIL
 224         | FATTR4_WORD0_FILES_FREE
 225         | FATTR4_WORD0_FILES_TOTAL,
 226         FATTR4_WORD1_SPACE_AVAIL
 227         | FATTR4_WORD1_SPACE_FREE
 228         | FATTR4_WORD1_SPACE_TOTAL
 229 };
 230
 231 const u32 nfs4_pathconf_bitmap[3] = {
 232         FATTR4_WORD0_MAXLINK
 233         | FATTR4_WORD0_MAXNAME,
 234         0
 235 };
 236
 237 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 238                         | FATTR4_WORD0_MAXREAD
 239                         | FATTR4_WORD0_MAXWRITE
 240                         | FATTR4_WORD0_LEASE_TIME,
 241                         FATTR4_WORD1_TIME_DELTA
 242                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 243                         FATTR4_WORD2_LAYOUT_BLKSIZE
 244                         | FATTR4_WORD2_CLONE_BLKSIZE
 245 };
 246
 247 const u32 nfs4_fs_locations_bitmap[3] = {
 248         FATTR4_WORD0_TYPE
 249         | FATTR4_WORD0_CHANGE
 250         | FATTR4_WORD0_SIZE
 251         | FATTR4_WORD0_FSID
 252         | FATTR4_WORD0_FILEID
 253         | FATTR4_WORD0_FS_LOCATIONS,
 254         FATTR4_WORD1_MODE
 255         | FATTR4_WORD1_NUMLINKS
 256         | FATTR4_WORD1_OWNER
 257         | FATTR4_WORD1_OWNER_GROUP
 258         | FATTR4_WORD1_RAWDEV
 259         | FATTR4_WORD1_SPACE_USED
 260         | FATTR4_WORD1_TIME_ACCESS
 261         | FATTR4_WORD1_TIME_METADATA
 262         | FATTR4_WORD1_TIME_MODIFY
 263         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 264 };
 265
 266 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 267                 struct nfs4_readdir_arg *readdir)
 268 {
 269         __be32 *start, *p;
 270
 271         if (cookie > 2) {
 272                 readdir->cookie = cookie;
 273                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 274                 return;
 275         }
 276
 277         readdir->cookie = 0;
 278         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 279         if (cookie == 2)
 280                 return;
 281
 282         /*
 283          * NFSv4 servers do not return entries for '.' and '..'
 284          * Therefore, we fake these entries here.  We let '.'
 285          * have cookie 0 and '..' have cookie 1.  Note that
 286          * when talking to the server, we always send cookie 0
 287          * instead of 1 or 2.
 288          */
 289         start = p = kmap_atomic(*readdir->pages);
 290
 291         if (cookie == 0) {
 292                 *p++ = xdr_one;                                  /* next */
 293                 *p++ = xdr_zero;                   /* cookie, first word */
 294                 *p++ = xdr_one;                   /* cookie, second word */
 295                 *p++ = xdr_one;                             /* entry len */
 296                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 297                 p++;
 298                 *p++ = xdr_one;                         /* bitmap length */
 299                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 300                 *p++ = htonl(8);              /* attribute buffer length */
 301                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 302         }
 303
 304         *p++ = xdr_one;                                  /* next */
 305         *p++ = xdr_zero;                   /* cookie, first word */
 306         *p++ = xdr_two;                   /* cookie, second word */
 307         *p++ = xdr_two;                             /* entry len */
 308         memcpy(p, "..\0\0", 4);                         /* entry */
 309         p++;
 310         *p++ = xdr_one;                         /* bitmap length */
 311         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 312         *p++ = htonl(8);              /* attribute buffer length */
 313         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 314
 315         readdir->pgbase = (char *)p - (char *)start;
 316         readdir->count -= readdir->pgbase;
 317         kunmap_atomic(start);
 318 }
 319
 320 static long nfs4_update_delay(long *timeout)
 321 {
 322         long ret;
 323         if (!timeout)
 324                 return NFS4_POLL_RETRY_MAX;
 325         if (*timeout <= 0)
 326                 *timeout = NFS4_POLL_RETRY_MIN;
 327         if (*timeout > NFS4_POLL_RETRY_MAX)
 328                 *timeout = NFS4_POLL_RETRY_MAX;
 329         ret = *timeout;
 330         *timeout <<= 1;
 331         return ret;
 332 }
 333
 334 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 335 {
 336         int res = 0;
 337
 338         might_sleep();
 339
 340         freezable_schedule_timeout_killable_unsafe(
 341                 nfs4_update_delay(timeout));
 342         if (fatal_signal_pending(current))
 343                 res = -ERESTARTSYS;
 344         return res;
 345 }
 346
 347 /* This is the error handling routine for processes that are allowed
 348  * to sleep.
 349  */
 350 static int nfs4_do_handle_exception(struct nfs_server *server,
 351                 int errorcode, struct nfs4_exception *exception)
 352 {
 353         struct nfs_client *clp = server->nfs_client;
 354         struct nfs4_state *state = exception->state;
 355         struct inode *inode = exception->inode;
 356         int ret = errorcode;
 357
 358         exception->delay = 0;
 359         exception->recovering = 0;
 360         exception->retry = 0;
 361         switch(errorcode) {
 362                 case 0:
 363                         return 0;
 364                 case -NFS4ERR_OPENMODE:
 365                 case -NFS4ERR_DELEG_REVOKED:
 366                 case -NFS4ERR_ADMIN_REVOKED:
 367                 case -NFS4ERR_BAD_STATEID:
 368                         if (inode && nfs_async_inode_return_delegation(inode,
 369                                                 NULL) == 0)
 370                                 goto wait_on_recovery;
 371                         if (state == NULL)
 372                                 break;
 373                         ret = nfs4_schedule_stateid_recovery(server, state);
 374                         if (ret < 0)
 375                                 break;
 376                         goto wait_on_recovery;
 377                 case -NFS4ERR_EXPIRED:
 378                         if (state != NULL) {
 379                                 ret = nfs4_schedule_stateid_recovery(server, state);
 380                                 if (ret < 0)
 381                                         break;
 382                         }
 383                 case -NFS4ERR_STALE_STATEID:
 384                 case -NFS4ERR_STALE_CLIENTID:
 385                         nfs4_schedule_lease_recovery(clp);
 386                         goto wait_on_recovery;
 387                 case -NFS4ERR_MOVED:
 388                         ret = nfs4_schedule_migration_recovery(server);
 389                         if (ret < 0)
 390                                 break;
 391                         goto wait_on_recovery;
 392                 case -NFS4ERR_LEASE_MOVED:
 393                         nfs4_schedule_lease_moved_recovery(clp);
 394                         goto wait_on_recovery;
 395 #if defined(CONFIG_NFS_V4_1)
 396                 case -NFS4ERR_BADSESSION:
 397                 case -NFS4ERR_BADSLOT:
 398                 case -NFS4ERR_BAD_HIGH_SLOT:
 399                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 400                 case -NFS4ERR_DEADSESSION:
 401                 case -NFS4ERR_SEQ_FALSE_RETRY:
 402                 case -NFS4ERR_SEQ_MISORDERED:
 403                         dprintk("%s ERROR: %d Reset session\n", __func__,
 404                                 errorcode);
 405                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 406                         goto wait_on_recovery;
 407 #endif /* defined(CONFIG_NFS_V4_1) */
 408                 case -NFS4ERR_FILE_OPEN:
 409                         if (exception->timeout > HZ) {
 410                                 /* We have retried a decent amount, time to
 411                                  * fail
 412                                  */
 413                                 ret = -EBUSY;
 414                                 break;
 415                         }
 416                 case -NFS4ERR_DELAY:
 417                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 418                 case -NFS4ERR_GRACE:
 419                         exception->delay = 1;
 420                         return 0;
 421
 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         exception->recovering = 1;
 443         return 0;
 444 }
 445
 446 /* This is the error handling routine for processes that are allowed
 447  * to sleep.
 448  */
 449 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 450 {
 451         struct nfs_client *clp = server->nfs_client;
 452         int ret;
 453
 454         ret = nfs4_do_handle_exception(server, errorcode, exception);
 455         if (exception->delay) {
 456                 ret = nfs4_delay(server->client, &exception->timeout);
 457                 goto out_retry;
 458         }
 459         if (exception->recovering) {
 460                 ret = nfs4_wait_clnt_recover(clp);
 461                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 462                         return -EIO;
 463                 goto out_retry;
 464         }
 465         return ret;
 466 out_retry:
 467         if (ret == 0)
 468                 exception->retry = 1;
 469         return ret;
 470 }
 471
 472 static int
 473 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 474                 int errorcode, struct nfs4_exception *exception)
 475 {
 476         struct nfs_client *clp = server->nfs_client;
 477         int ret;
 478
 479         ret = nfs4_do_handle_exception(server, errorcode, exception);
 480         if (exception->delay) {
 481                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 482                 goto out_retry;
 483         }
 484         if (exception->recovering) {
 485                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 486                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 487                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 488                 goto out_retry;
 489         }
 490         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 491                 ret = -EIO;
 492         return ret;
 493 out_retry:
 494         if (ret == 0)
 495                 exception->retry = 1;
 496         return ret;
 497 }
 498
 499 static int
 500 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 501                         struct nfs4_state *state, long *timeout)
 502 {
 503         struct nfs4_exception exception = {
 504                 .state = state,
 505         };
 506
 507         if (task->tk_status >= 0)
 508                 return 0;
 509         if (timeout)
 510                 exception.timeout = *timeout;
 511         task->tk_status = nfs4_async_handle_exception(task, server,
 512                         task->tk_status,
 513                         &exception);
 514         if (exception.delay && timeout)
 515                 *timeout = exception.timeout;
 516         if (exception.retry)
 517                 return -EAGAIN;
 518         return 0;
 519 }
 520
 521 /*
 522  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 523  * or 'false' otherwise.
 524  */
 525 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 526 {
 527         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 528
 529         if (flavor == RPC_AUTH_GSS_KRB5I ||
 530             flavor == RPC_AUTH_GSS_KRB5P)
 531                 return true;
 532
 533         return false;
 534 }
 535
 536 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 537 {
 538         spin_lock(&clp->cl_lock);
 539         if (time_before(clp->cl_last_renewal,timestamp))
 540                 clp->cl_last_renewal = timestamp;
 541         spin_unlock(&clp->cl_lock);
 542 }
 543
 544 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 545 {
 546         struct nfs_client *clp = server->nfs_client;
 547
 548         if (!nfs4_has_session(clp))
 549                 do_renew_lease(clp, timestamp);
 550 }
 551
 552 struct nfs4_call_sync_data {
 553         const struct nfs_server *seq_server;
 554         struct nfs4_sequence_args *seq_args;
 555         struct nfs4_sequence_res *seq_res;
 556 };
 557
 558 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 559                         struct nfs4_sequence_res *res, int cache_reply)
 560 {
 561         args->sa_slot = NULL;
 562         args->sa_cache_this = cache_reply;
 563         args->sa_privileged = 0;
 564
 565         res->sr_slot = NULL;
 566 }
 567
 568 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 569 {
 570         args->sa_privileged = 1;
 571 }
 572
 573 int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 574                          struct nfs4_sequence_args *args,
 575                          struct nfs4_sequence_res *res,
 576                          struct rpc_task *task)
 577 {
 578         struct nfs4_slot *slot;
 579
 580         /* slot already allocated? */
 581         if (res->sr_slot != NULL)
 582                 goto out_start;
 583
 584         spin_lock(&tbl->slot_tbl_lock);
 585         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 586                 goto out_sleep;
 587
 588         slot = nfs4_alloc_slot(tbl);
 589         if (IS_ERR(slot)) {
 590                 if (slot == ERR_PTR(-ENOMEM))
 591                         task->tk_timeout = HZ >> 2;
 592                 goto out_sleep;
 593         }
 594         spin_unlock(&tbl->slot_tbl_lock);
 595
 596         args->sa_slot = slot;
 597         res->sr_slot = slot;
 598
 599 out_start:
 600         rpc_call_start(task);
 601         return 0;
 602
 603 out_sleep:
 604         if (args->sa_privileged)
 605                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 606                                 NULL, RPC_PRIORITY_PRIVILEGED);
 607         else
 608                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 609         spin_unlock(&tbl->slot_tbl_lock);
 610         return -EAGAIN;
 611 }
 612 EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
 613
 614 static int nfs40_sequence_done(struct rpc_task *task,
 615                                struct nfs4_sequence_res *res)
 616 {
 617         struct nfs4_slot *slot = res->sr_slot;
 618         struct nfs4_slot_table *tbl;
 619
 620         if (slot == NULL)
 621                 goto out;
 622
 623         tbl = slot->table;
 624         spin_lock(&tbl->slot_tbl_lock);
 625         if (!nfs41_wake_and_assign_slot(tbl, slot))
 626                 nfs4_free_slot(tbl, slot);
 627         spin_unlock(&tbl->slot_tbl_lock);
 628
 629         res->sr_slot = NULL;
 630 out:
 631         return 1;
 632 }
 633
 634 #if defined(CONFIG_NFS_V4_1)
 635
 636 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 637 {
 638         struct nfs4_session *session;
 639         struct nfs4_slot_table *tbl;
 640         struct nfs4_slot *slot = res->sr_slot;
 641         bool send_new_highest_used_slotid = false;
 642
 643         tbl = slot->table;
 644         session = tbl->session;
 645
 646         spin_lock(&tbl->slot_tbl_lock);
 647         /* Be nice to the server: try to ensure that the last transmitted
 648          * value for highest_user_slotid <= target_highest_slotid
 649          */
 650         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 651                 send_new_highest_used_slotid = true;
 652
 653         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 654                 send_new_highest_used_slotid = false;
 655                 goto out_unlock;
 656         }
 657         nfs4_free_slot(tbl, slot);
 658
 659         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 660                 send_new_highest_used_slotid = false;
 661 out_unlock:
 662         spin_unlock(&tbl->slot_tbl_lock);
 663         res->sr_slot = NULL;
 664         if (send_new_highest_used_slotid)
 665                 nfs41_notify_server(session->clp);
 666 }
 667
 668 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 669 {
 670         struct nfs4_session *session;
 671         struct nfs4_slot *slot = res->sr_slot;
 672         struct nfs_client *clp;
 673         bool interrupted = false;
 674         int ret = 1;
 675
 676         if (slot == NULL)
 677                 goto out_noaction;
 678         /* don't increment the sequence number if the task wasn't sent */
 679         if (!RPC_WAS_SENT(task))
 680                 goto out;
 681
 682         session = slot->table->session;
 683
 684         if (slot->interrupted) {
 685                 slot->interrupted = 0;
 686                 interrupted = true;
 687         }
 688
 689         trace_nfs4_sequence_done(session, res);
 690         /* Check the SEQUENCE operation status */
 691         switch (res->sr_status) {
 692         case 0:
 693                 /* Update the slot's sequence and clientid lease timer */
 694                 ++slot->seq_nr;
 695                 clp = session->clp;
 696                 do_renew_lease(clp, res->sr_timestamp);
 697                 /* Check sequence flags */
 698                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 699                 nfs41_update_target_slotid(slot->table, slot, res);
 700                 break;
 701         case 1:
 702                 /*
 703                  * sr_status remains 1 if an RPC level error occurred.
 704                  * The server may or may not have processed the sequence
 705                  * operation..
 706                  * Mark the slot as having hosted an interrupted RPC call.
 707                  */
 708                 slot->interrupted = 1;
 709                 goto out;
 710         case -NFS4ERR_DELAY:
 711                 /* The server detected a resend of the RPC call and
 712                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 713                  * of RFC5661.
 714                  */
 715                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 716                         __func__,
 717                         slot->slot_nr,
 718                         slot->seq_nr);
 719                 goto out_retry;
 720         case -NFS4ERR_BADSLOT:
 721                 /*
 722                  * The slot id we used was probably retired. Try again
 723                  * using a different slot id.
 724                  */
 725                 goto retry_nowait;
 726         case -NFS4ERR_SEQ_MISORDERED:
 727                 /*
 728                  * Was the last operation on this sequence interrupted?
 729                  * If so, retry after bumping the sequence number.
 730                  */
 731                 if (interrupted) {
 732                         ++slot->seq_nr;
 733                         goto retry_nowait;
 734                 }
 735                 /*
 736                  * Could this slot have been previously retired?
 737                  * If so, then the server may be expecting seq_nr = 1!
 738                  */
 739                 if (slot->seq_nr != 1) {
 740                         slot->seq_nr = 1;
 741                         goto retry_nowait;
 742                 }
 743                 break;
 744         case -NFS4ERR_SEQ_FALSE_RETRY:
 745                 ++slot->seq_nr;
 746                 goto retry_nowait;
 747         default:
 748                 /* Just update the slot sequence no. */
 749                 ++slot->seq_nr;
 750         }
 751 out:
 752         /* The session may be reset by one of the error handlers. */
 753         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 754         nfs41_sequence_free_slot(res);
 755 out_noaction:
 756         return ret;
 757 retry_nowait:
 758         if (rpc_restart_call_prepare(task)) {
 759                 task->tk_status = 0;
 760                 ret = 0;
 761         }
 762         goto out;
 763 out_retry:
 764         if (!rpc_restart_call(task))
 765                 goto out;
 766         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 767         return 0;
 768 }
 769 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 770
 771 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 772 {
 773         if (res->sr_slot == NULL)
 774                 return 1;
 775         if (!res->sr_slot->table->session)
 776                 return nfs40_sequence_done(task, res);
 777         return nfs41_sequence_done(task, res);
 778 }
 779 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 780
 781 int nfs41_setup_sequence(struct nfs4_session *session,
 782                                 struct nfs4_sequence_args *args,
 783                                 struct nfs4_sequence_res *res,
 784                                 struct rpc_task *task)
 785 {
 786         struct nfs4_slot *slot;
 787         struct nfs4_slot_table *tbl;
 788
 789         dprintk("--> %s\n", __func__);
 790         /* slot already allocated? */
 791         if (res->sr_slot != NULL)
 792                 goto out_success;
 793
 794         tbl = &session->fc_slot_table;
 795
 796         task->tk_timeout = 0;
 797
 798         spin_lock(&tbl->slot_tbl_lock);
 799         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 800             !args->sa_privileged) {
 801                 /* The state manager will wait until the slot table is empty */
 802                 dprintk("%s session is draining\n", __func__);
 803                 goto out_sleep;
 804         }
 805
 806         slot = nfs4_alloc_slot(tbl);
 807         if (IS_ERR(slot)) {
 808                 /* If out of memory, try again in 1/4 second */
 809                 if (slot == ERR_PTR(-ENOMEM))
 810                         task->tk_timeout = HZ >> 2;
 811                 dprintk("<-- %s: no free slots\n", __func__);
 812                 goto out_sleep;
 813         }
 814         spin_unlock(&tbl->slot_tbl_lock);
 815
 816         args->sa_slot = slot;
 817
 818         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 819                         slot->slot_nr, slot->seq_nr);
 820
 821         res->sr_slot = slot;
 822         res->sr_timestamp = jiffies;
 823         res->sr_status_flags = 0;
 824         /*
 825          * sr_status is only set in decode_sequence, and so will remain
 826          * set to 1 if an rpc level failure occurs.
 827          */
 828         res->sr_status = 1;
 829         trace_nfs4_setup_sequence(session, args);
 830 out_success:
 831         rpc_call_start(task);
 832         return 0;
 833 out_sleep:
 834         /* Privileged tasks are queued with top priority */
 835         if (args->sa_privileged)
 836                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 837                                 NULL, RPC_PRIORITY_PRIVILEGED);
 838         else
 839                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 840         spin_unlock(&tbl->slot_tbl_lock);
 841         return -EAGAIN;
 842 }
 843 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 844
 845 static int nfs4_setup_sequence(const struct nfs_server *server,
 846                                struct nfs4_sequence_args *args,
 847                                struct nfs4_sequence_res *res,
 848                                struct rpc_task *task)
 849 {
 850         struct nfs4_session *session = nfs4_get_session(server);
 851         int ret = 0;
 852
 853         if (!session)
 854                 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 855                                             args, res, task);
 856
 857         dprintk("--> %s clp %p session %p sr_slot %u\n",
 858                 __func__, session->clp, session, res->sr_slot ?
 859                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 860
 861         ret = nfs41_setup_sequence(session, args, res, task);
 862
 863         dprintk("<-- %s status=%d\n", __func__, ret);
 864         return ret;
 865 }
 866
 867 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 868 {
 869         struct nfs4_call_sync_data *data = calldata;
 870         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 871
 872         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 873
 874         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 875 }
 876
 877 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 878 {
 879         struct nfs4_call_sync_data *data = calldata;
 880
 881         nfs41_sequence_done(task, data->seq_res);
 882 }
 883
 884 static const struct rpc_call_ops nfs41_call_sync_ops = {
 885         .rpc_call_prepare = nfs41_call_sync_prepare,
 886         .rpc_call_done = nfs41_call_sync_done,
 887 };
 888
 889 #else   /* !CONFIG_NFS_V4_1 */
 890
 891 static int nfs4_setup_sequence(const struct nfs_server *server,
 892                                struct nfs4_sequence_args *args,
 893                                struct nfs4_sequence_res *res,
 894                                struct rpc_task *task)
 895 {
 896         return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 897                                     args, res, task);
 898 }
 899
 900 int nfs4_sequence_done(struct rpc_task *task,
 901                        struct nfs4_sequence_res *res)
 902 {
 903         return nfs40_sequence_done(task, res);
 904 }
 905 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 906
 907 #endif  /* !CONFIG_NFS_V4_1 */
 908
 909 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 910 {
 911         struct nfs4_call_sync_data *data = calldata;
 912         nfs4_setup_sequence(data->seq_server,
 913                                 data->seq_args, data->seq_res, task);
 914 }
 915
 916 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 917 {
 918         struct nfs4_call_sync_data *data = calldata;
 919         nfs4_sequence_done(task, data->seq_res);
 920 }
 921
 922 static const struct rpc_call_ops nfs40_call_sync_ops = {
 923         .rpc_call_prepare = nfs40_call_sync_prepare,
 924         .rpc_call_done = nfs40_call_sync_done,
 925 };
 926
 927 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 928                                    struct nfs_server *server,
 929                                    struct rpc_message *msg,
 930                                    struct nfs4_sequence_args *args,
 931                                    struct nfs4_sequence_res *res)
 932 {
 933         int ret;
 934         struct rpc_task *task;
 935         struct nfs_client *clp = server->nfs_client;
 936         struct nfs4_call_sync_data data = {
 937                 .seq_server = server,
 938                 .seq_args = args,
 939                 .seq_res = res,
 940         };
 941         struct rpc_task_setup task_setup = {
 942                 .rpc_client = clnt,
 943                 .rpc_message = msg,
 944                 .callback_ops = clp->cl_mvops->call_sync_ops,
 945                 .callback_data = &data
 946         };
 947
 948         task = rpc_run_task(&task_setup);
 949         if (IS_ERR(task))
 950                 ret = PTR_ERR(task);
 951         else {
 952                 ret = task->tk_status;
 953                 rpc_put_task(task);
 954         }
 955         return ret;
 956 }
 957
 958 int nfs4_call_sync(struct rpc_clnt *clnt,
 959                    struct nfs_server *server,
 960                    struct rpc_message *msg,
 961                    struct nfs4_sequence_args *args,
 962                    struct nfs4_sequence_res *res,
 963                    int cache_reply)
 964 {
 965         nfs4_init_sequence(args, res, cache_reply);
 966         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 967 }
 968
 969 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 970 {
 971         struct nfs_inode *nfsi = NFS_I(dir);
 972
 973         spin_lock(&dir->i_lock);
 974         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 975         if (!cinfo->atomic || cinfo->before != dir->i_version)
 976                 nfs_force_lookup_revalidate(dir);
 977         dir->i_version = cinfo->after;
 978         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
 979         nfs_fscache_invalidate(dir);
 980         spin_unlock(&dir->i_lock);
 981 }
 982
 983 struct nfs4_opendata {
 984         struct kref kref;
 985         struct nfs_openargs o_arg;
 986         struct nfs_openres o_res;
 987         struct nfs_open_confirmargs c_arg;
 988         struct nfs_open_confirmres c_res;
 989         struct nfs4_string owner_name;
 990         struct nfs4_string group_name;
 991         struct nfs4_label *a_label;
 992         struct nfs_fattr f_attr;
 993         struct nfs4_label *f_label;
 994         struct dentry *dir;
 995         struct dentry *dentry;
 996         struct nfs4_state_owner *owner;
 997         struct nfs4_state *state;
 998         struct iattr attrs;
 999         unsigned long timestamp;
1000         unsigned int rpc_done : 1;
1001         unsigned int file_created : 1;
1002         unsigned int is_recover : 1;
1003         int rpc_status;
1004         int cancelled;
1005 };
1006
1007 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1008                 int err, struct nfs4_exception *exception)
1009 {
1010         if (err != -EINVAL)
1011                 return false;
1012         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1013                 return false;
1014         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1015         exception->retry = 1;
1016         return true;
1017 }
1018
1019 static u32
1020 nfs4_map_atomic_open_share(struct nfs_server *server,
1021                 fmode_t fmode, int openflags)
1022 {
1023         u32 res = 0;
1024
1025         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1026         case FMODE_READ:
1027                 res = NFS4_SHARE_ACCESS_READ;
1028                 break;
1029         case FMODE_WRITE:
1030                 res = NFS4_SHARE_ACCESS_WRITE;
1031                 break;
1032         case FMODE_READ|FMODE_WRITE:
1033                 res = NFS4_SHARE_ACCESS_BOTH;
1034         }
1035         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1036                 goto out;
1037         /* Want no delegation if we're using O_DIRECT */
1038         if (openflags & O_DIRECT)
1039                 res |= NFS4_SHARE_WANT_NO_DELEG;
1040 out:
1041         return res;
1042 }
1043
1044 static enum open_claim_type4
1045 nfs4_map_atomic_open_claim(struct nfs_server *server,
1046                 enum open_claim_type4 claim)
1047 {
1048         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1049                 return claim;
1050         switch (claim) {
1051         default:
1052                 return claim;
1053         case NFS4_OPEN_CLAIM_FH:
1054                 return NFS4_OPEN_CLAIM_NULL;
1055         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1056                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1057         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1058                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1059         }
1060 }
1061
1062 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1063 {
1064         p->o_res.f_attr = &p->f_attr;
1065         p->o_res.f_label = p->f_label;
1066         p->o_res.seqid = p->o_arg.seqid;
1067         p->c_res.seqid = p->c_arg.seqid;
1068         p->o_res.server = p->o_arg.server;
1069         p->o_res.access_request = p->o_arg.access;
1070         nfs_fattr_init(&p->f_attr);
1071         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1072 }
1073
1074 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1075                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1076                 const struct iattr *attrs,
1077                 struct nfs4_label *label,
1078                 enum open_claim_type4 claim,
1079                 gfp_t gfp_mask)
1080 {
1081         struct dentry *parent = dget_parent(dentry);
1082         struct inode *dir = d_inode(parent);
1083         struct nfs_server *server = NFS_SERVER(dir);
1084         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1085         struct nfs4_opendata *p;
1086
1087         p = kzalloc(sizeof(*p), gfp_mask);
1088         if (p == NULL)
1089                 goto err;
1090
1091         p->f_label = nfs4_label_alloc(server, gfp_mask);
1092         if (IS_ERR(p->f_label))
1093                 goto err_free_p;
1094
1095         p->a_label = nfs4_label_alloc(server, gfp_mask);
1096         if (IS_ERR(p->a_label))
1097                 goto err_free_f;
1098
1099         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1100         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1101         if (IS_ERR(p->o_arg.seqid))
1102                 goto err_free_label;
1103         nfs_sb_active(dentry->d_sb);
1104         p->dentry = dget(dentry);
1105         p->dir = parent;
1106         p->owner = sp;
1107         atomic_inc(&sp->so_count);
1108         p->o_arg.open_flags = flags;
1109         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1110         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1111                         fmode, flags);
1112         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1113          * will return permission denied for all bits until close */
1114         if (!(flags & O_EXCL)) {
1115                 /* ask server to check for all possible rights as results
1116                  * are cached */
1117                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1118                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1119         }
1120         p->o_arg.clientid = server->nfs_client->cl_clientid;
1121         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1122         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1123         p->o_arg.name = &dentry->d_name;
1124         p->o_arg.server = server;
1125         p->o_arg.bitmask = nfs4_bitmask(server, label);
1126         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1127         p->o_arg.label = nfs4_label_copy(p->a_label, label);
1128         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1129         switch (p->o_arg.claim) {
1130         case NFS4_OPEN_CLAIM_NULL:
1131         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1132         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1133                 p->o_arg.fh = NFS_FH(dir);
1134                 break;
1135         case NFS4_OPEN_CLAIM_PREVIOUS:
1136         case NFS4_OPEN_CLAIM_FH:
1137         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1138         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1139                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1140         }
1141         if (attrs != NULL && attrs->ia_valid != 0) {
1142                 __u32 verf[2];
1143
1144                 p->o_arg.u.attrs = &p->attrs;
1145                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1146
1147                 verf[0] = jiffies;
1148                 verf[1] = current->pid;
1149                 memcpy(p->o_arg.u.verifier.data, verf,
1150                                 sizeof(p->o_arg.u.verifier.data));
1151         }
1152         p->c_arg.fh = &p->o_res.fh;
1153         p->c_arg.stateid = &p->o_res.stateid;
1154         p->c_arg.seqid = p->o_arg.seqid;
1155         nfs4_init_opendata_res(p);
1156         kref_init(&p->kref);
1157         return p;
1158
1159 err_free_label:
1160         nfs4_label_free(p->a_label);
1161 err_free_f:
1162         nfs4_label_free(p->f_label);
1163 err_free_p:
1164         kfree(p);
1165 err:
1166         dput(parent);
1167         return NULL;
1168 }
1169
1170 static void nfs4_opendata_free(struct kref *kref)
1171 {
1172         struct nfs4_opendata *p = container_of(kref,
1173                         struct nfs4_opendata, kref);
1174         struct super_block *sb = p->dentry->d_sb;
1175
1176         nfs_free_seqid(p->o_arg.seqid);
1177         if (p->state != NULL)
1178                 nfs4_put_open_state(p->state);
1179         nfs4_put_state_owner(p->owner);
1180
1181         nfs4_label_free(p->a_label);
1182         nfs4_label_free(p->f_label);
1183
1184         dput(p->dir);
1185         dput(p->dentry);
1186         nfs_sb_deactive(sb);
1187         nfs_fattr_free_names(&p->f_attr);
1188         kfree(p->f_attr.mdsthreshold);
1189         kfree(p);
1190 }
1191
1192 static void nfs4_opendata_put(struct nfs4_opendata *p)
1193 {
1194         if (p != NULL)
1195                 kref_put(&p->kref, nfs4_opendata_free);
1196 }
1197
1198 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1199 {
1200         int ret;
1201
1202         ret = rpc_wait_for_completion_task(task);
1203         return ret;
1204 }
1205
1206 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1207                 fmode_t fmode)
1208 {
1209         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1210         case FMODE_READ|FMODE_WRITE:
1211                 return state->n_rdwr != 0;
1212         case FMODE_WRITE:
1213                 return state->n_wronly != 0;
1214         case FMODE_READ:
1215                 return state->n_rdonly != 0;
1216         }
1217         WARN_ON_ONCE(1);
1218         return false;
1219 }
1220
1221 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1222 {
1223         int ret = 0;
1224
1225         if (open_mode & (O_EXCL|O_TRUNC))
1226                 goto out;
1227         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1228                 case FMODE_READ:
1229                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1230                                 && state->n_rdonly != 0;
1231                         break;
1232                 case FMODE_WRITE:
1233                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1234                                 && state->n_wronly != 0;
1235                         break;
1236                 case FMODE_READ|FMODE_WRITE:
1237                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1238                                 && state->n_rdwr != 0;
1239         }
1240 out:
1241         return ret;
1242 }
1243
1244 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1245                 enum open_claim_type4 claim)
1246 {
1247         if (delegation == NULL)
1248                 return 0;
1249         if ((delegation->type & fmode) != fmode)
1250                 return 0;
1251         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1252                 return 0;
1253         switch (claim) {
1254         case NFS4_OPEN_CLAIM_NULL:
1255         case NFS4_OPEN_CLAIM_FH:
1256                 break;
1257         case NFS4_OPEN_CLAIM_PREVIOUS:
1258                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1259                         break;
1260         default:
1261                 return 0;
1262         }
1263         nfs_mark_delegation_referenced(delegation);
1264         return 1;
1265 }
1266
1267 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1268 {
1269         switch (fmode) {
1270                 case FMODE_WRITE:
1271                         state->n_wronly++;
1272                         break;
1273                 case FMODE_READ:
1274                         state->n_rdonly++;
1275                         break;
1276                 case FMODE_READ|FMODE_WRITE:
1277                         state->n_rdwr++;
1278         }
1279         nfs4_state_set_mode_locked(state, state->state | fmode);
1280 }
1281
1282 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1283 {
1284         struct nfs_client *clp = state->owner->so_server->nfs_client;
1285         bool need_recover = false;
1286
1287         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1288                 need_recover = true;
1289         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1290                 need_recover = true;
1291         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1292                 need_recover = true;
1293         if (need_recover)
1294                 nfs4_state_mark_reclaim_nograce(clp, state);
1295 }
1296
1297 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1298                 nfs4_stateid *stateid)
1299 {
1300         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1301                 return true;
1302         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1303                 nfs_test_and_clear_all_open_stateid(state);
1304                 return true;
1305         }
1306         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1307                 return true;
1308         return false;
1309 }
1310
1311 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1312 {
1313         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1314                 return;
1315         if (state->n_wronly)
1316                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1317         if (state->n_rdonly)
1318                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1319         if (state->n_rdwr)
1320                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1321         set_bit(NFS_OPEN_STATE, &state->flags);
1322 }
1323
1324 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1325                 nfs4_stateid *arg_stateid,
1326                 nfs4_stateid *stateid, fmode_t fmode)
1327 {
1328         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1329         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1330         case FMODE_WRITE:
1331                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1332                 break;
1333         case FMODE_READ:
1334                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1335                 break;
1336         case 0:
1337                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1338                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1339                 clear_bit(NFS_OPEN_STATE, &state->flags);
1340         }
1341         if (stateid == NULL)
1342                 return;
1343         /* Handle races with OPEN */
1344         if (!nfs4_stateid_match_other(arg_stateid, &state->open_stateid) ||
1345             (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1346             !nfs4_stateid_is_newer(stateid, &state->open_stateid))) {
1347                 nfs_resync_open_stateid_locked(state);
1348                 return;
1349         }
1350         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1351                 nfs4_stateid_copy(&state->stateid, stateid);
1352         nfs4_stateid_copy(&state->open_stateid, stateid);
1353 }
1354
1355 static void nfs_clear_open_stateid(struct nfs4_state *state,
1356         nfs4_stateid *arg_stateid,
1357         nfs4_stateid *stateid, fmode_t fmode)
1358 {
1359         write_seqlock(&state->seqlock);
1360         nfs_clear_open_stateid_locked(state, arg_stateid, stateid, fmode);
1361         write_sequnlock(&state->seqlock);
1362         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1363                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1364 }
1365
1366 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1367 {
1368         switch (fmode) {
1369                 case FMODE_READ:
1370                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1371                         break;
1372                 case FMODE_WRITE:
1373                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1374                         break;
1375                 case FMODE_READ|FMODE_WRITE:
1376                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1377         }
1378         if (!nfs_need_update_open_stateid(state, stateid))
1379                 return;
1380         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1381                 nfs4_stateid_copy(&state->stateid, stateid);
1382         nfs4_stateid_copy(&state->open_stateid, stateid);
1383 }
1384
1385 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1386 {
1387         /*
1388          * Protect the call to nfs4_state_set_mode_locked and
1389          * serialise the stateid update
1390          */
1391         spin_lock(&state->owner->so_lock);
1392         write_seqlock(&state->seqlock);
1393         if (deleg_stateid != NULL) {
1394                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1395                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1396         }
1397         if (open_stateid != NULL)
1398                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1399         write_sequnlock(&state->seqlock);
1400         update_open_stateflags(state, fmode);
1401         spin_unlock(&state->owner->so_lock);
1402 }
1403
1404 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1405 {
1406         struct nfs_inode *nfsi = NFS_I(state->inode);
1407         struct nfs_delegation *deleg_cur;
1408         int ret = 0;
1409
1410         fmode &= (FMODE_READ|FMODE_WRITE);
1411
1412         rcu_read_lock();
1413         deleg_cur = rcu_dereference(nfsi->delegation);
1414         if (deleg_cur == NULL)
1415                 goto no_delegation;
1416
1417         spin_lock(&deleg_cur->lock);
1418         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1419            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1420             (deleg_cur->type & fmode) != fmode)
1421                 goto no_delegation_unlock;
1422
1423         if (delegation == NULL)
1424                 delegation = &deleg_cur->stateid;
1425         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1426                 goto no_delegation_unlock;
1427
1428         nfs_mark_delegation_referenced(deleg_cur);
1429         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1430         ret = 1;
1431 no_delegation_unlock:
1432         spin_unlock(&deleg_cur->lock);
1433 no_delegation:
1434         rcu_read_unlock();
1435
1436         if (!ret && open_stateid != NULL) {
1437                 __update_open_stateid(state, open_stateid, NULL, fmode);
1438                 ret = 1;
1439         }
1440         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1441                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1442
1443         return ret;
1444 }
1445
1446 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1447                 const nfs4_stateid *stateid)
1448 {
1449         struct nfs4_state *state = lsp->ls_state;
1450         bool ret = false;
1451
1452         spin_lock(&state->state_lock);
1453         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1454                 goto out_noupdate;
1455         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1456                 goto out_noupdate;
1457         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1458         ret = true;
1459 out_noupdate:
1460         spin_unlock(&state->state_lock);
1461         return ret;
1462 }
1463
1464 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1465 {
1466         struct nfs_delegation *delegation;
1467
1468         rcu_read_lock();
1469         delegation = rcu_dereference(NFS_I(inode)->delegation);
1470         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1471                 rcu_read_unlock();
1472                 return;
1473         }
1474         rcu_read_unlock();
1475         nfs4_inode_return_delegation(inode);
1476 }
1477
1478 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1479 {
1480         struct nfs4_state *state = opendata->state;
1481         struct nfs_inode *nfsi = NFS_I(state->inode);
1482         struct nfs_delegation *delegation;
1483         int open_mode = opendata->o_arg.open_flags;
1484         fmode_t fmode = opendata->o_arg.fmode;
1485         enum open_claim_type4 claim = opendata->o_arg.claim;
1486         nfs4_stateid stateid;
1487         int ret = -EAGAIN;
1488
1489         for (;;) {
1490                 spin_lock(&state->owner->so_lock);
1491                 if (can_open_cached(state, fmode, open_mode)) {
1492                         update_open_stateflags(state, fmode);
1493                         spin_unlock(&state->owner->so_lock);
1494                         goto out_return_state;
1495                 }
1496                 spin_unlock(&state->owner->so_lock);
1497                 rcu_read_lock();
1498                 delegation = rcu_dereference(nfsi->delegation);
1499                 if (!can_open_delegated(delegation, fmode, claim)) {
1500                         rcu_read_unlock();
1501                         break;
1502                 }
1503                 /* Save the delegation */
1504                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1505                 rcu_read_unlock();
1506                 nfs_release_seqid(opendata->o_arg.seqid);
1507                 if (!opendata->is_recover) {
1508                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1509                         if (ret != 0)
1510                                 goto out;
1511                 }
1512                 ret = -EAGAIN;
1513
1514                 /* Try to update the stateid using the delegation */
1515                 if (update_open_stateid(state, NULL, &stateid, fmode))
1516                         goto out_return_state;
1517         }
1518 out:
1519         return ERR_PTR(ret);
1520 out_return_state:
1521         atomic_inc(&state->count);
1522         return state;
1523 }
1524
1525 static void
1526 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1527 {
1528         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1529         struct nfs_delegation *delegation;
1530         int delegation_flags = 0;
1531
1532         rcu_read_lock();
1533         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1534         if (delegation)
1535                 delegation_flags = delegation->flags;
1536         rcu_read_unlock();
1537         switch (data->o_arg.claim) {
1538         default:
1539                 break;
1540         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1541         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1542                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1543                                    "returning a delegation for "
1544                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1545                                    clp->cl_hostname);
1546                 return;
1547         }
1548         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1549                 nfs_inode_set_delegation(state->inode,
1550                                          data->owner->so_cred,
1551                                          &data->o_res);
1552         else
1553                 nfs_inode_reclaim_delegation(state->inode,
1554                                              data->owner->so_cred,
1555                                              &data->o_res);
1556 }
1557
1558 /*
1559  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1560  * and update the nfs4_state.
1561  */
1562 static struct nfs4_state *
1563 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1564 {
1565         struct inode *inode = data->state->inode;
1566         struct nfs4_state *state = data->state;
1567         int ret;
1568
1569         if (!data->rpc_done) {
1570                 if (data->rpc_status) {
1571                         ret = data->rpc_status;
1572                         goto err;
1573                 }
1574                 /* cached opens have already been processed */
1575                 goto update;
1576         }
1577
1578         ret = nfs_refresh_inode(inode, &data->f_attr);
1579         if (ret)
1580                 goto err;
1581
1582         if (data->o_res.delegation_type != 0)
1583                 nfs4_opendata_check_deleg(data, state);
1584 update:
1585         update_open_stateid(state, &data->o_res.stateid, NULL,
1586                             data->o_arg.fmode);
1587         atomic_inc(&state->count);
1588
1589         return state;
1590 err:
1591         return ERR_PTR(ret);
1592
1593 }
1594
1595 static struct nfs4_state *
1596 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1597 {
1598         struct inode *inode;
1599         struct nfs4_state *state = NULL;
1600         int ret;
1601
1602         if (!data->rpc_done) {
1603                 state = nfs4_try_open_cached(data);
1604                 trace_nfs4_cached_open(data->state);
1605                 goto out;
1606         }
1607
1608         ret = -EAGAIN;
1609         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1610                 goto err;
1611         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1612         ret = PTR_ERR(inode);
1613         if (IS_ERR(inode))
1614                 goto err;
1615         ret = -ENOMEM;
1616         state = nfs4_get_open_state(inode, data->owner);
1617         if (state == NULL)
1618                 goto err_put_inode;
1619         if (data->o_res.delegation_type != 0)
1620                 nfs4_opendata_check_deleg(data, state);
1621         update_open_stateid(state, &data->o_res.stateid, NULL,
1622                         data->o_arg.fmode);
1623         iput(inode);
1624 out:
1625         nfs_release_seqid(data->o_arg.seqid);
1626         return state;
1627 err_put_inode:
1628         iput(inode);
1629 err:
1630         return ERR_PTR(ret);
1631 }
1632
1633 static struct nfs4_state *
1634 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1635 {
1636         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1637                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1638         return _nfs4_opendata_to_nfs4_state(data);
1639 }
1640
1641 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1642 {
1643         struct nfs_inode *nfsi = NFS_I(state->inode);
1644         struct nfs_open_context *ctx;
1645
1646         spin_lock(&state->inode->i_lock);
1647         list_for_each_entry(ctx, &nfsi->open_files, list) {
1648                 if (ctx->state != state)
1649                         continue;
1650                 get_nfs_open_context(ctx);
1651                 spin_unlock(&state->inode->i_lock);
1652                 return ctx;
1653         }
1654         spin_unlock(&state->inode->i_lock);
1655         return ERR_PTR(-ENOENT);
1656 }
1657
1658 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1659                 struct nfs4_state *state, enum open_claim_type4 claim)
1660 {
1661         struct nfs4_opendata *opendata;
1662
1663         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1664                         NULL, NULL, claim, GFP_NOFS);
1665         if (opendata == NULL)
1666                 return ERR_PTR(-ENOMEM);
1667         opendata->state = state;
1668         atomic_inc(&state->count);
1669         return opendata;
1670 }
1671
1672 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
1673                 fmode_t fmode)
1674 {
1675         struct nfs4_state *newstate;
1676         int ret;
1677
1678         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
1679                 return 0;
1680         opendata->o_arg.open_flags = 0;
1681         opendata->o_arg.fmode = fmode;
1682         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1683                         NFS_SB(opendata->dentry->d_sb),
1684                         fmode, 0);
1685         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1686         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1687         nfs4_init_opendata_res(opendata);
1688         ret = _nfs4_recover_proc_open(opendata);
1689         if (ret != 0)
1690                 return ret;
1691         newstate = nfs4_opendata_to_nfs4_state(opendata);
1692         if (IS_ERR(newstate))
1693                 return PTR_ERR(newstate);
1694         if (newstate != opendata->state)
1695                 ret = -ESTALE;
1696         nfs4_close_state(newstate, fmode);
1697         return ret;
1698 }
1699
1700 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1701 {
1702         int ret;
1703
1704         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1705         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1706         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1707         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1708         /* memory barrier prior to reading state->n_* */
1709         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1710         clear_bit(NFS_OPEN_STATE, &state->flags);
1711         smp_rmb();
1712         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1713         if (ret != 0)
1714                 return ret;
1715         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1716         if (ret != 0)
1717                 return ret;
1718         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
1719         if (ret != 0)
1720                 return ret;
1721         /*
1722          * We may have performed cached opens for all three recoveries.
1723          * Check if we need to update the current stateid.
1724          */
1725         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1726             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1727                 write_seqlock(&state->seqlock);
1728                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1729                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1730                 write_sequnlock(&state->seqlock);
1731         }
1732         return 0;
1733 }
1734
1735 /*
1736  * OPEN_RECLAIM:
1737  *      reclaim state on the server after a reboot.
1738  */
1739 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1740 {
1741         struct nfs_delegation *delegation;
1742         struct nfs4_opendata *opendata;
1743         fmode_t delegation_type = 0;
1744         int status;
1745
1746         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1747                         NFS4_OPEN_CLAIM_PREVIOUS);
1748         if (IS_ERR(opendata))
1749                 return PTR_ERR(opendata);
1750         rcu_read_lock();
1751         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1752         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1753                 delegation_type = delegation->type;
1754         rcu_read_unlock();
1755         opendata->o_arg.u.delegation_type = delegation_type;
1756         status = nfs4_open_recover(opendata, state);
1757         nfs4_opendata_put(opendata);
1758         return status;
1759 }
1760
1761 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1762 {
1763         struct nfs_server *server = NFS_SERVER(state->inode);
1764         struct nfs4_exception exception = { };
1765         int err;
1766         do {
1767                 err = _nfs4_do_open_reclaim(ctx, state);
1768                 trace_nfs4_open_reclaim(ctx, 0, err);
1769                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1770                         continue;
1771                 if (err != -NFS4ERR_DELAY)
1772                         break;
1773                 nfs4_handle_exception(server, err, &exception);
1774         } while (exception.retry);
1775         return err;
1776 }
1777
1778 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1779 {
1780         struct nfs_open_context *ctx;
1781         int ret;
1782
1783         ctx = nfs4_state_find_open_context(state);
1784         if (IS_ERR(ctx))
1785                 return -EAGAIN;
1786         ret = nfs4_do_open_reclaim(ctx, state);
1787         put_nfs_open_context(ctx);
1788         return ret;
1789 }
1790
1791 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1792 {
1793         switch (err) {
1794                 default:
1795                         printk(KERN_ERR "NFS: %s: unhandled error "
1796                                         "%d.\n", __func__, err);
1797                 case 0:
1798                 case -ENOENT:
1799                 case -EAGAIN:
1800                 case -ESTALE:
1801                         break;
1802                 case -NFS4ERR_BADSESSION:
1803                 case -NFS4ERR_BADSLOT:
1804                 case -NFS4ERR_BAD_HIGH_SLOT:
1805                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1806                 case -NFS4ERR_DEADSESSION:
1807                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1808                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1809                         return -EAGAIN;
1810                 case -NFS4ERR_STALE_CLIENTID:
1811                 case -NFS4ERR_STALE_STATEID:
1812                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1813                 case -NFS4ERR_EXPIRED:
1814                         /* Don't recall a delegation if it was lost */
1815                         nfs4_schedule_lease_recovery(server->nfs_client);
1816                         return -EAGAIN;
1817                 case -NFS4ERR_MOVED:
1818                         nfs4_schedule_migration_recovery(server);
1819                         return -EAGAIN;
1820                 case -NFS4ERR_LEASE_MOVED:
1821                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1822                         return -EAGAIN;
1823                 case -NFS4ERR_DELEG_REVOKED:
1824                 case -NFS4ERR_ADMIN_REVOKED:
1825                 case -NFS4ERR_BAD_STATEID:
1826                 case -NFS4ERR_OPENMODE:
1827                         nfs_inode_find_state_and_recover(state->inode,
1828                                         stateid);
1829                         nfs4_schedule_stateid_recovery(server, state);
1830                         return -EAGAIN;
1831                 case -NFS4ERR_DELAY:
1832                 case -NFS4ERR_GRACE:
1833                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1834                         ssleep(1);
1835                         return -EAGAIN;
1836                 case -ENOMEM:
1837                 case -NFS4ERR_DENIED:
1838                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1839                         return 0;
1840         }
1841         return err;
1842 }
1843
1844 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
1845                 struct nfs4_state *state, const nfs4_stateid *stateid,
1846                 fmode_t type)
1847 {
1848         struct nfs_server *server = NFS_SERVER(state->inode);
1849         struct nfs4_opendata *opendata;
1850         int err = 0;
1851
1852         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1853                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1854         if (IS_ERR(opendata))
1855                 return PTR_ERR(opendata);
1856         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1857         write_seqlock(&state->seqlock);
1858         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1859         write_sequnlock(&state->seqlock);
1860         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1861         switch (type & (FMODE_READ|FMODE_WRITE)) {
1862         case FMODE_READ|FMODE_WRITE:
1863         case FMODE_WRITE:
1864                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1865                 if (err)
1866                         break;
1867                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1868                 if (err)
1869                         break;
1870         case FMODE_READ:
1871                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
1872         }
1873         nfs4_opendata_put(opendata);
1874         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1875 }
1876
1877 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1878 {
1879         struct nfs4_opendata *data = calldata;
1880
1881         nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
1882                              &data->c_arg.seq_args, &data->c_res.seq_res, task);
1883 }
1884
1885 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1886 {
1887         struct nfs4_opendata *data = calldata;
1888
1889         nfs40_sequence_done(task, &data->c_res.seq_res);
1890
1891         data->rpc_status = task->tk_status;
1892         if (data->rpc_status == 0) {
1893                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1894                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1895                 renew_lease(data->o_res.server, data->timestamp);
1896                 data->rpc_done = 1;
1897         }
1898 }
1899
1900 static void nfs4_open_confirm_release(void *calldata)
1901 {
1902         struct nfs4_opendata *data = calldata;
1903         struct nfs4_state *state = NULL;
1904
1905         /* If this request hasn't been cancelled, do nothing */
1906         if (data->cancelled == 0)
1907                 goto out_free;
1908         /* In case of error, no cleanup! */
1909         if (!data->rpc_done)
1910                 goto out_free;
1911         state = nfs4_opendata_to_nfs4_state(data);
1912         if (!IS_ERR(state))
1913                 nfs4_close_state(state, data->o_arg.fmode);
1914 out_free:
1915         nfs4_opendata_put(data);
1916 }
1917
1918 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1919         .rpc_call_prepare = nfs4_open_confirm_prepare,
1920         .rpc_call_done = nfs4_open_confirm_done,
1921         .rpc_release = nfs4_open_confirm_release,
1922 };
1923
1924 /*
1925  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1926  */
1927 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1928 {
1929         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
1930         struct rpc_task *task;
1931         struct  rpc_message msg = {
1932                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1933                 .rpc_argp = &data->c_arg,
1934                 .rpc_resp = &data->c_res,
1935                 .rpc_cred = data->owner->so_cred,
1936         };
1937         struct rpc_task_setup task_setup_data = {
1938                 .rpc_client = server->client,
1939                 .rpc_message = &msg,
1940                 .callback_ops = &nfs4_open_confirm_ops,
1941                 .callback_data = data,
1942                 .workqueue = nfsiod_workqueue,
1943                 .flags = RPC_TASK_ASYNC,
1944         };
1945         int status;
1946
1947         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1948         kref_get(&data->kref);
1949         data->rpc_done = 0;
1950         data->rpc_status = 0;
1951         data->timestamp = jiffies;
1952         if (data->is_recover)
1953                 nfs4_set_sequence_privileged(&data->c_arg.seq_args);
1954         task = rpc_run_task(&task_setup_data);
1955         if (IS_ERR(task))
1956                 return PTR_ERR(task);
1957         status = nfs4_wait_for_completion_rpc_task(task);
1958         if (status != 0) {
1959                 data->cancelled = 1;
1960                 smp_wmb();
1961         } else
1962                 status = data->rpc_status;
1963         rpc_put_task(task);
1964         return status;
1965 }
1966
1967 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1968 {
1969         struct nfs4_opendata *data = calldata;
1970         struct nfs4_state_owner *sp = data->owner;
1971         struct nfs_client *clp = sp->so_server->nfs_client;
1972         enum open_claim_type4 claim = data->o_arg.claim;
1973
1974         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1975                 goto out_wait;
1976         /*
1977          * Check if we still need to send an OPEN call, or if we can use
1978          * a delegation instead.
1979          */
1980         if (data->state != NULL) {
1981                 struct nfs_delegation *delegation;
1982
1983                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1984                         goto out_no_action;
1985                 rcu_read_lock();
1986                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1987                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
1988                         goto unlock_no_action;
1989                 rcu_read_unlock();
1990         }
1991         /* Update client id. */
1992         data->o_arg.clientid = clp->cl_clientid;
1993         switch (claim) {
1994         default:
1995                 break;
1996         case NFS4_OPEN_CLAIM_PREVIOUS:
1997         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1998         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1999                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2000         case NFS4_OPEN_CLAIM_FH:
2001                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2002                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
2003         }
2004         data->timestamp = jiffies;
2005         if (nfs4_setup_sequence(data->o_arg.server,
2006                                 &data->o_arg.seq_args,
2007                                 &data->o_res.seq_res,
2008                                 task) != 0)
2009                 nfs_release_seqid(data->o_arg.seqid);
2010
2011         /* Set the create mode (note dependency on the session type) */
2012         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2013         if (data->o_arg.open_flags & O_EXCL) {
2014                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2015                 if (nfs4_has_persistent_session(clp))
2016                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2017                 else if (clp->cl_mvops->minor_version > 0)
2018                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2019         }
2020         return;
2021 unlock_no_action:
2022         trace_nfs4_cached_open(data->state);
2023         rcu_read_unlock();
2024 out_no_action:
2025         task->tk_action = NULL;
2026 out_wait:
2027         nfs4_sequence_done(task, &data->o_res.seq_res);
2028 }
2029
2030 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2031 {
2032         struct nfs4_opendata *data = calldata;
2033
2034         data->rpc_status = task->tk_status;
2035
2036         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
2037                 return;
2038
2039         if (task->tk_status == 0) {
2040                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2041                         switch (data->o_res.f_attr->mode & S_IFMT) {
2042                         case S_IFREG:
2043                                 break;
2044                         case S_IFLNK:
2045                                 data->rpc_status = -ELOOP;
2046                                 break;
2047                         case S_IFDIR:
2048                                 data->rpc_status = -EISDIR;
2049                                 break;
2050                         default:
2051                                 data->rpc_status = -ENOTDIR;
2052                         }
2053                 }
2054                 renew_lease(data->o_res.server, data->timestamp);
2055                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2056                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2057         }
2058         data->rpc_done = 1;
2059 }
2060
2061 static void nfs4_open_release(void *calldata)
2062 {
2063         struct nfs4_opendata *data = calldata;
2064         struct nfs4_state *state = NULL;
2065
2066         /* If this request hasn't been cancelled, do nothing */
2067         if (data->cancelled == 0)
2068                 goto out_free;
2069         /* In case of error, no cleanup! */
2070         if (data->rpc_status != 0 || !data->rpc_done)
2071                 goto out_free;
2072         /* In case we need an open_confirm, no cleanup! */
2073         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2074                 goto out_free;
2075         state = nfs4_opendata_to_nfs4_state(data);
2076         if (!IS_ERR(state))
2077                 nfs4_close_state(state, data->o_arg.fmode);
2078 out_free:
2079         nfs4_opendata_put(data);
2080 }
2081
2082 static const struct rpc_call_ops nfs4_open_ops = {
2083         .rpc_call_prepare = nfs4_open_prepare,
2084         .rpc_call_done = nfs4_open_done,
2085         .rpc_release = nfs4_open_release,
2086 };
2087
2088 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
2089 {
2090         struct inode *dir = d_inode(data->dir);
2091         struct nfs_server *server = NFS_SERVER(dir);
2092         struct nfs_openargs *o_arg = &data->o_arg;
2093         struct nfs_openres *o_res = &data->o_res;
2094         struct rpc_task *task;
2095         struct rpc_message msg = {
2096                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2097                 .rpc_argp = o_arg,
2098                 .rpc_resp = o_res,
2099                 .rpc_cred = data->owner->so_cred,
2100         };
2101         struct rpc_task_setup task_setup_data = {
2102                 .rpc_client = server->client,
2103                 .rpc_message = &msg,
2104                 .callback_ops = &nfs4_open_ops,
2105                 .callback_data = data,
2106                 .workqueue = nfsiod_workqueue,
2107                 .flags = RPC_TASK_ASYNC,
2108         };
2109         int status;
2110
2111         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
2112         kref_get(&data->kref);
2113         data->rpc_done = 0;
2114         data->rpc_status = 0;
2115         data->cancelled = 0;
2116         data->is_recover = 0;
2117         if (isrecover) {
2118                 nfs4_set_sequence_privileged(&o_arg->seq_args);
2119                 data->is_recover = 1;
2120         }
2121         task = rpc_run_task(&task_setup_data);
2122         if (IS_ERR(task))
2123                 return PTR_ERR(task);
2124         status = nfs4_wait_for_completion_rpc_task(task);
2125         if (status != 0) {
2126                 data->cancelled = 1;
2127                 smp_wmb();
2128         } else
2129                 status = data->rpc_status;
2130         rpc_put_task(task);
2131
2132         return status;
2133 }
2134
2135 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2136 {
2137         struct inode *dir = d_inode(data->dir);
2138         struct nfs_openres *o_res = &data->o_res;
2139         int status;
2140
2141         status = nfs4_run_open_task(data, 1);
2142         if (status != 0 || !data->rpc_done)
2143                 return status;
2144
2145         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2146
2147         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2148                 status = _nfs4_proc_open_confirm(data);
2149                 if (status != 0)
2150                         return status;
2151         }
2152
2153         return status;
2154 }
2155
2156 /*
2157  * Additional permission checks in order to distinguish between an
2158  * open for read, and an open for execute. This works around the
2159  * fact that NFSv4 OPEN treats read and execute permissions as being
2160  * the same.
2161  * Note that in the non-execute case, we want to turn off permission
2162  * checking if we just created a new file (POSIX open() semantics).
2163  */
2164 static int nfs4_opendata_access(struct rpc_cred *cred,
2165                                 struct nfs4_opendata *opendata,
2166                                 struct nfs4_state *state, fmode_t fmode,
2167                                 int openflags)
2168 {
2169         struct nfs_access_entry cache;
2170         u32 mask;
2171
2172         /* access call failed or for some reason the server doesn't
2173          * support any access modes -- defer access call until later */
2174         if (opendata->o_res.access_supported == 0)
2175                 return 0;
2176
2177         mask = 0;
2178         /*
2179          * Use openflags to check for exec, because fmode won't
2180          * always have FMODE_EXEC set when file open for exec.
2181          */
2182         if (openflags & __FMODE_EXEC) {
2183                 /* ONLY check for exec rights */
2184                 mask = MAY_EXEC;
2185         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2186                 mask = MAY_READ;
2187
2188         cache.cred = cred;
2189         cache.jiffies = jiffies;
2190         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2191         nfs_access_add_cache(state->inode, &cache);
2192
2193         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2194                 return 0;
2195
2196         /* even though OPEN succeeded, access is denied. Close the file */
2197         nfs4_close_state(state, fmode);
2198         return -EACCES;
2199 }
2200
2201 /*
2202  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2203  */
2204 static int _nfs4_proc_open(struct nfs4_opendata *data)
2205 {
2206         struct inode *dir = d_inode(data->dir);
2207         struct nfs_server *server = NFS_SERVER(dir);
2208         struct nfs_openargs *o_arg = &data->o_arg;
2209         struct nfs_openres *o_res = &data->o_res;
2210         int status;
2211
2212         status = nfs4_run_open_task(data, 0);
2213         if (!data->rpc_done)
2214                 return status;
2215         if (status != 0) {
2216                 if (status == -NFS4ERR_BADNAME &&
2217                                 !(o_arg->open_flags & O_CREAT))
2218                         return -ENOENT;
2219                 return status;
2220         }
2221
2222         nfs_fattr_map_and_free_names(server, &data->f_attr);
2223
2224         if (o_arg->open_flags & O_CREAT) {
2225                 update_changeattr(dir, &o_res->cinfo);
2226                 if (o_arg->open_flags & O_EXCL)
2227                         data->file_created = 1;
2228                 else if (o_res->cinfo.before != o_res->cinfo.after)
2229                         data->file_created = 1;
2230         }
2231         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2232                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2233         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2234                 status = _nfs4_proc_open_confirm(data);
2235                 if (status != 0)
2236                         return status;
2237         }
2238         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2239                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2240         return 0;
2241 }
2242
2243 static int nfs4_recover_expired_lease(struct nfs_server *server)
2244 {
2245         return nfs4_client_recover_expired_lease(server->nfs_client);
2246 }
2247
2248 /*
2249  * OPEN_EXPIRED:
2250  *      reclaim state on the server after a network partition.
2251  *      Assumes caller holds the appropriate lock
2252  */
2253 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2254 {
2255         struct nfs4_opendata *opendata;
2256         int ret;
2257
2258         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2259                         NFS4_OPEN_CLAIM_FH);
2260         if (IS_ERR(opendata))
2261                 return PTR_ERR(opendata);
2262         ret = nfs4_open_recover(opendata, state);
2263         if (ret == -ESTALE)
2264                 d_drop(ctx->dentry);
2265         nfs4_opendata_put(opendata);
2266         return ret;
2267 }
2268
2269 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2270 {
2271         struct nfs_server *server = NFS_SERVER(state->inode);
2272         struct nfs4_exception exception = { };
2273         int err;
2274
2275         do {
2276                 err = _nfs4_open_expired(ctx, state);
2277                 trace_nfs4_open_expired(ctx, 0, err);
2278                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2279                         continue;
2280                 switch (err) {
2281                 default:
2282                         goto out;
2283                 case -NFS4ERR_GRACE:
2284                 case -NFS4ERR_DELAY:
2285                         nfs4_handle_exception(server, err, &exception);
2286                         err = 0;
2287                 }
2288         } while (exception.retry);
2289 out:
2290         return err;
2291 }
2292
2293 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2294 {
2295         struct nfs_open_context *ctx;
2296         int ret;
2297
2298         ctx = nfs4_state_find_open_context(state);
2299         if (IS_ERR(ctx))
2300                 return -EAGAIN;
2301         ret = nfs4_do_open_expired(ctx, state);
2302         put_nfs_open_context(ctx);
2303         return ret;
2304 }
2305
2306 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2307 {
2308         nfs_remove_bad_delegation(state->inode);
2309         write_seqlock(&state->seqlock);
2310         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2311         write_sequnlock(&state->seqlock);
2312         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2313 }
2314
2315 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2316 {
2317         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2318                 nfs_finish_clear_delegation_stateid(state);
2319 }
2320
2321 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2322 {
2323         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2324         nfs40_clear_delegation_stateid(state);
2325         return nfs4_open_expired(sp, state);
2326 }
2327
2328 #if defined(CONFIG_NFS_V4_1)
2329 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2330 {
2331         struct nfs_server *server = NFS_SERVER(state->inode);
2332         nfs4_stateid stateid;
2333         struct nfs_delegation *delegation;
2334         struct rpc_cred *cred;
2335         int status;
2336
2337         /* Get the delegation credential for use by test/free_stateid */
2338         rcu_read_lock();
2339         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2340         if (delegation == NULL) {
2341                 rcu_read_unlock();
2342                 return;
2343         }
2344
2345         nfs4_stateid_copy(&stateid, &delegation->stateid);
2346         cred = get_rpccred(delegation->cred);
2347         rcu_read_unlock();
2348         status = nfs41_test_stateid(server, &stateid, cred);
2349         trace_nfs4_test_delegation_stateid(state, NULL, status);
2350
2351         if (status != NFS_OK) {
2352                 /* Free the stateid unless the server explicitly
2353                  * informs us the stateid is unrecognized. */
2354                 if (status != -NFS4ERR_BAD_STATEID)
2355                         nfs41_free_stateid(server, &stateid, cred);
2356                 nfs_finish_clear_delegation_stateid(state);
2357         }
2358
2359         put_rpccred(cred);
2360 }
2361
2362 /**
2363  * nfs41_check_open_stateid - possibly free an open stateid
2364  *
2365  * @state: NFSv4 state for an inode
2366  *
2367  * Returns NFS_OK if recovery for this stateid is now finished.
2368  * Otherwise a negative NFS4ERR value is returned.
2369  */
2370 static int nfs41_check_open_stateid(struct nfs4_state *state)
2371 {
2372         struct nfs_server *server = NFS_SERVER(state->inode);
2373         nfs4_stateid *stateid = &state->open_stateid;
2374         struct rpc_cred *cred = state->owner->so_cred;
2375         int status;
2376
2377         /* If a state reset has been done, test_stateid is unneeded */
2378         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2379             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2380             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2381                 return -NFS4ERR_BAD_STATEID;
2382
2383         status = nfs41_test_stateid(server, stateid, cred);
2384         trace_nfs4_test_open_stateid(state, NULL, status);
2385         if (status != NFS_OK) {
2386                 /* Free the stateid unless the server explicitly
2387                  * informs us the stateid is unrecognized. */
2388                 if (status != -NFS4ERR_BAD_STATEID)
2389                         nfs41_free_stateid(server, stateid, cred);
2390
2391                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2392                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2393                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2394                 clear_bit(NFS_OPEN_STATE, &state->flags);
2395         }
2396         return status;
2397 }
2398
2399 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2400 {
2401         int status;
2402
2403         nfs41_check_delegation_stateid(state);
2404         status = nfs41_check_open_stateid(state);
2405         if (status != NFS_OK)
2406                 status = nfs4_open_expired(sp, state);
2407         return status;
2408 }
2409 #endif
2410
2411 /*
2412  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2413  * fields corresponding to attributes that were used to store the verifier.
2414  * Make sure we clobber those fields in the later setattr call
2415  */
2416 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2417                                 struct iattr *sattr, struct nfs4_label **label)
2418 {
2419         const u32 *attrset = opendata->o_res.attrset;
2420
2421         if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2422             !(sattr->ia_valid & ATTR_ATIME_SET))
2423                 sattr->ia_valid |= ATTR_ATIME;
2424
2425         if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2426             !(sattr->ia_valid & ATTR_MTIME_SET))
2427                 sattr->ia_valid |= ATTR_MTIME;
2428
2429         /* Except MODE, it seems harmless of setting twice. */
2430         if ((attrset[1] & FATTR4_WORD1_MODE))
2431                 sattr->ia_valid &= ~ATTR_MODE;
2432
2433         if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL)
2434                 *label = NULL;
2435 }
2436
2437 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2438                 fmode_t fmode,
2439                 int flags,
2440                 struct nfs_open_context *ctx)
2441 {
2442         struct nfs4_state_owner *sp = opendata->owner;
2443         struct nfs_server *server = sp->so_server;
2444         struct dentry *dentry;
2445         struct nfs4_state *state;
2446         unsigned int seq;
2447         int ret;
2448
2449         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2450
2451         ret = _nfs4_proc_open(opendata);
2452         if (ret != 0)
2453                 goto out;
2454
2455         state = nfs4_opendata_to_nfs4_state(opendata);
2456         ret = PTR_ERR(state);
2457         if (IS_ERR(state))
2458                 goto out;
2459         if (server->caps & NFS_CAP_POSIX_LOCK)
2460                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2461
2462         dentry = opendata->dentry;
2463         if (d_really_is_negative(dentry)) {
2464                 /* FIXME: Is this d_drop() ever needed? */
2465                 d_drop(dentry);
2466                 dentry = d_add_unique(dentry, igrab(state->inode));
2467                 if (dentry == NULL) {
2468                         dentry = opendata->dentry;
2469                 } else if (dentry != ctx->dentry) {
2470                         dput(ctx->dentry);
2471                         ctx->dentry = dget(dentry);
2472                 }
2473                 nfs_set_verifier(dentry,
2474                                 nfs_save_change_attribute(d_inode(opendata->dir)));
2475         }
2476
2477         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2478         if (ret != 0)
2479                 goto out;
2480
2481         ctx->state = state;
2482         if (d_inode(dentry) == state->inode) {
2483                 nfs_inode_attach_open_context(ctx);
2484                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2485                         nfs4_schedule_stateid_recovery(server, state);
2486         }
2487 out:
2488         return ret;
2489 }
2490
2491 /*
2492  * Returns a referenced nfs4_state
2493  */
2494 static int _nfs4_do_open(struct inode *dir,
2495                         struct nfs_open_context *ctx,
2496                         int flags,
2497                         struct iattr *sattr,
2498                         struct nfs4_label *label,
2499                         int *opened)
2500 {
2501         struct nfs4_state_owner  *sp;
2502         struct nfs4_state     *state = NULL;
2503         struct nfs_server       *server = NFS_SERVER(dir);
2504         struct nfs4_opendata *opendata;
2505         struct dentry *dentry = ctx->dentry;
2506         struct rpc_cred *cred = ctx->cred;
2507         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2508         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2509         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2510         struct nfs4_label *olabel = NULL;
2511         int status;
2512
2513         /* Protect against reboot recovery conflicts */
2514         status = -ENOMEM;
2515         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2516         if (sp == NULL) {
2517                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2518                 goto out_err;
2519         }
2520         status = nfs4_recover_expired_lease(server);
2521         if (status != 0)
2522                 goto err_put_state_owner;
2523         if (d_really_is_positive(dentry))
2524                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2525         status = -ENOMEM;
2526         if (d_really_is_positive(dentry))
2527                 claim = NFS4_OPEN_CLAIM_FH;
2528         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2529                         label, claim, GFP_KERNEL);
2530         if (opendata == NULL)
2531                 goto err_put_state_owner;
2532
2533         if (label) {
2534                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2535                 if (IS_ERR(olabel)) {
2536                         status = PTR_ERR(olabel);
2537                         goto err_opendata_put;
2538                 }
2539         }
2540
2541         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2542                 if (!opendata->f_attr.mdsthreshold) {
2543                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2544                         if (!opendata->f_attr.mdsthreshold)
2545                                 goto err_free_label;
2546                 }
2547                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2548         }
2549         if (d_really_is_positive(dentry))
2550                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2551
2552         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2553         if (status != 0)
2554                 goto err_free_label;
2555         state = ctx->state;
2556
2557         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
2558             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2559                 nfs4_exclusive_attrset(opendata, sattr, &label);
2560
2561                 nfs_fattr_init(opendata->o_res.f_attr);
2562                 status = nfs4_do_setattr(state->inode, cred,
2563                                 opendata->o_res.f_attr, sattr,
2564                                 state, label, olabel);
2565                 if (status == 0) {
2566                         nfs_setattr_update_inode(state->inode, sattr,
2567                                         opendata->o_res.f_attr);
2568                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2569                 }
2570         }
2571         if (opened && opendata->file_created)
2572                 *opened |= FILE_CREATED;
2573
2574         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2575                 *ctx_th = opendata->f_attr.mdsthreshold;
2576                 opendata->f_attr.mdsthreshold = NULL;
2577         }
2578
2579         nfs4_label_free(olabel);
2580
2581         nfs4_opendata_put(opendata);
2582         nfs4_put_state_owner(sp);
2583         return 0;
2584 err_free_label:
2585         nfs4_label_free(olabel);
2586 err_opendata_put:
2587         nfs4_opendata_put(opendata);
2588 err_put_state_owner:
2589         nfs4_put_state_owner(sp);
2590 out_err:
2591         return status;
2592 }
2593
2594
2595 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2596                                         struct nfs_open_context *ctx,
2597                                         int flags,
2598                                         struct iattr *sattr,
2599                                         struct nfs4_label *label,
2600                                         int *opened)
2601 {
2602         struct nfs_server *server = NFS_SERVER(dir);
2603         struct nfs4_exception exception = { };
2604         struct nfs4_state *res;
2605         int status;
2606
2607         do {
2608                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2609                 res = ctx->state;
2610                 trace_nfs4_open_file(ctx, flags, status);
2611                 if (status == 0)
2612                         break;
2613                 /* NOTE: BAD_SEQID means the server and client disagree about the
2614                  * book-keeping w.r.t. state-changing operations
2615                  * (OPEN/CLOSE/LOCK/LOCKU...)
2616                  * It is actually a sign of a bug on the client or on the server.
2617                  *
2618                  * If we receive a BAD_SEQID error in the particular case of
2619                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2620                  * have unhashed the old state_owner for us, and that we can
2621                  * therefore safely retry using a new one. We should still warn
2622                  * the user though...
2623                  */
2624                 if (status == -NFS4ERR_BAD_SEQID) {
2625                         pr_warn_ratelimited("NFS: v4 server %s "
2626                                         " returned a bad sequence-id error!\n",
2627                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2628                         exception.retry = 1;
2629                         continue;
2630                 }
2631                 /*
2632                  * BAD_STATEID on OPEN means that the server cancelled our
2633                  * state before it received the OPEN_CONFIRM.
2634                  * Recover by retrying the request as per the discussion
2635                  * on Page 181 of RFC3530.
2636                  */
2637                 if (status == -NFS4ERR_BAD_STATEID) {
2638                         exception.retry = 1;
2639                         continue;
2640                 }
2641                 if (status == -EAGAIN) {
2642                         /* We must have found a delegation */
2643                         exception.retry = 1;
2644                         continue;
2645                 }
2646                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2647                         continue;
2648                 res = ERR_PTR(nfs4_handle_exception(server,
2649                                         status, &exception));
2650         } while (exception.retry);
2651         return res;
2652 }
2653
2654 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2655                             struct nfs_fattr *fattr, struct iattr *sattr,
2656                             struct nfs4_state *state, struct nfs4_label *ilabel,
2657                             struct nfs4_label *olabel)
2658 {
2659         struct nfs_server *server = NFS_SERVER(inode);
2660         struct nfs_setattrargs  arg = {
2661                 .fh             = NFS_FH(inode),
2662                 .iap            = sattr,
2663                 .server         = server,
2664                 .bitmask = server->attr_bitmask,
2665                 .label          = ilabel,
2666         };
2667         struct nfs_setattrres  res = {
2668                 .fattr          = fattr,
2669                 .label          = olabel,
2670                 .server         = server,
2671         };
2672         struct rpc_message msg = {
2673                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2674                 .rpc_argp       = &arg,
2675                 .rpc_resp       = &res,
2676                 .rpc_cred       = cred,
2677         };
2678         unsigned long timestamp = jiffies;
2679         fmode_t fmode;
2680         bool truncate;
2681         int status;
2682
2683         arg.bitmask = nfs4_bitmask(server, ilabel);
2684         if (ilabel)
2685                 arg.bitmask = nfs4_bitmask(server, olabel);
2686
2687         nfs_fattr_init(fattr);
2688
2689         /* Servers should only apply open mode checks for file size changes */
2690         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2691         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2692
2693         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2694                 /* Use that stateid */
2695         } else if (truncate && state != NULL) {
2696                 struct nfs_lockowner lockowner = {
2697                         .l_owner = current->files,
2698                         .l_pid = current->tgid,
2699                 };
2700                 if (!nfs4_valid_open_stateid(state))
2701                         return -EBADF;
2702                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2703                                 &lockowner) == -EIO)
2704                         return -EBADF;
2705         } else
2706                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2707
2708         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2709         if (status == 0 && state != NULL)
2710                 renew_lease(server, timestamp);
2711         trace_nfs4_setattr(inode, &arg.stateid, status);
2712         return status;
2713 }
2714
2715 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2716                            struct nfs_fattr *fattr, struct iattr *sattr,
2717                            struct nfs4_state *state, struct nfs4_label *ilabel,
2718                            struct nfs4_label *olabel)
2719 {
2720         struct nfs_server *server = NFS_SERVER(inode);
2721         struct nfs4_exception exception = {
2722                 .state = state,
2723                 .inode = inode,
2724         };
2725         int err;
2726         do {
2727                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2728                 switch (err) {
2729                 case -NFS4ERR_OPENMODE:
2730                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2731                                 pr_warn_once("NFSv4: server %s is incorrectly "
2732                                                 "applying open mode checks to "
2733                                                 "a SETATTR that is not "
2734                                                 "changing file size.\n",
2735                                                 server->nfs_client->cl_hostname);
2736                         }
2737                         if (state && !(state->state & FMODE_WRITE)) {
2738                                 err = -EBADF;
2739                                 if (sattr->ia_valid & ATTR_OPEN)
2740                                         err = -EACCES;
2741                                 goto out;
2742                         }
2743                 }
2744                 err = nfs4_handle_exception(server, err, &exception);
2745         } while (exception.retry);
2746 out:
2747         return err;
2748 }
2749
2750 static bool
2751 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
2752 {
2753         if (inode == NULL || !nfs_have_layout(inode))
2754                 return false;
2755
2756         return pnfs_wait_on_layoutreturn(inode, task);
2757 }
2758
2759 struct nfs4_closedata {
2760         struct inode *inode;
2761         struct nfs4_state *state;
2762         struct nfs_closeargs arg;
2763         struct nfs_closeres res;
2764         struct nfs_fattr fattr;
2765         unsigned long timestamp;
2766         bool roc;
2767         u32 roc_barrier;
2768 };
2769
2770 static void nfs4_free_closedata(void *data)
2771 {
2772         struct nfs4_closedata *calldata = data;
2773         struct nfs4_state_owner *sp = calldata->state->owner;
2774         struct super_block *sb = calldata->state->inode->i_sb;
2775
2776         if (calldata->roc)
2777                 pnfs_roc_release(calldata->state->inode);
2778         nfs4_put_open_state(calldata->state);
2779         nfs_free_seqid(calldata->arg.seqid);
2780         nfs4_put_state_owner(sp);
2781         nfs_sb_deactive(sb);
2782         kfree(calldata);
2783 }
2784
2785 static void nfs4_close_done(struct rpc_task *task, void *data)
2786 {
2787         struct nfs4_closedata *calldata = data;
2788         struct nfs4_state *state = calldata->state;
2789         struct nfs_server *server = NFS_SERVER(calldata->inode);
2790         nfs4_stateid *res_stateid = NULL;
2791
2792         dprintk("%s: begin!\n", __func__);
2793         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2794                 return;
2795         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2796         /* hmm. we are done with the inode, and in the process of freeing
2797          * the state_owner. we keep this around to process errors
2798          */
2799         switch (task->tk_status) {
2800                 case 0:
2801                         res_stateid = &calldata->res.stateid;
2802                         if (calldata->roc)
2803                                 pnfs_roc_set_barrier(state->inode,
2804                                                      calldata->roc_barrier);
2805                         renew_lease(server, calldata->timestamp);
2806                         break;
2807                 case -NFS4ERR_ADMIN_REVOKED:
2808                 case -NFS4ERR_STALE_STATEID:
2809                 case -NFS4ERR_OLD_STATEID:
2810                 case -NFS4ERR_BAD_STATEID:
2811                 case -NFS4ERR_EXPIRED:
2812                         if (!nfs4_stateid_match(&calldata->arg.stateid,
2813                                                 &state->open_stateid)) {
2814                                 rpc_restart_call_prepare(task);
2815                                 goto out_release;
2816                         }
2817                         if (calldata->arg.fmode == 0)
2818                                 break;
2819                 default:
2820                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2821                                 rpc_restart_call_prepare(task);
2822                                 goto out_release;
2823                         }
2824         }
2825         nfs_clear_open_stateid(state, &calldata->arg.stateid,
2826                         res_stateid, calldata->arg.fmode);
2827 out_release:
2828         nfs_release_seqid(calldata->arg.seqid);
2829         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2830         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2831 }
2832
2833 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2834 {
2835         struct nfs4_closedata *calldata = data;
2836         struct nfs4_state *state = calldata->state;
2837         struct inode *inode = calldata->inode;
2838         bool is_rdonly, is_wronly, is_rdwr;
2839         int call_close = 0;
2840
2841         dprintk("%s: begin!\n", __func__);
2842         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2843                 goto out_wait;
2844
2845         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2846         spin_lock(&state->owner->so_lock);
2847         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2848         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2849         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2850         nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
2851         /* Calculate the change in open mode */
2852         calldata->arg.fmode = 0;
2853         if (state->n_rdwr == 0) {
2854                 if (state->n_rdonly == 0)
2855                         call_close |= is_rdonly;
2856                 else if (is_rdonly)
2857                         calldata->arg.fmode |= FMODE_READ;
2858                 if (state->n_wronly == 0)
2859                         call_close |= is_wronly;
2860                 else if (is_wronly)
2861                         calldata->arg.fmode |= FMODE_WRITE;
2862         } else if (is_rdwr)
2863                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2864
2865         if (calldata->arg.fmode == 0)
2866                 call_close |= is_rdwr;
2867
2868         if (!nfs4_valid_open_stateid(state))
2869                 call_close = 0;
2870         spin_unlock(&state->owner->so_lock);
2871
2872         if (!call_close) {
2873                 /* Note: exit _without_ calling nfs4_close_done */
2874                 goto out_no_action;
2875         }
2876
2877         if (nfs4_wait_on_layoutreturn(inode, task)) {
2878                 nfs_release_seqid(calldata->arg.seqid);
2879                 goto out_wait;
2880         }
2881
2882         if (calldata->arg.fmode == 0)
2883                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2884         if (calldata->roc)
2885                 pnfs_roc_get_barrier(inode, &calldata->roc_barrier);
2886
2887         calldata->arg.share_access =
2888                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
2889                                 calldata->arg.fmode, 0);
2890
2891         nfs_fattr_init(calldata->res.fattr);
2892         calldata->timestamp = jiffies;
2893         if (nfs4_setup_sequence(NFS_SERVER(inode),
2894                                 &calldata->arg.seq_args,
2895                                 &calldata->res.seq_res,
2896                                 task) != 0)
2897                 nfs_release_seqid(calldata->arg.seqid);
2898         dprintk("%s: done!\n", __func__);
2899         return;
2900 out_no_action:
2901         task->tk_action = NULL;
2902 out_wait:
2903         nfs4_sequence_done(task, &calldata->res.seq_res);
2904 }
2905
2906 static const struct rpc_call_ops nfs4_close_ops = {
2907         .rpc_call_prepare = nfs4_close_prepare,
2908         .rpc_call_done = nfs4_close_done,
2909         .rpc_release = nfs4_free_closedata,
2910 };
2911
2912 static bool nfs4_roc(struct inode *inode)
2913 {
2914         if (!nfs_have_layout(inode))
2915                 return false;
2916         return pnfs_roc(inode);
2917 }
2918
2919 /*
2920  * It is possible for data to be read/written from a mem-mapped file
2921  * after the sys_close call (which hits the vfs layer as a flush).
2922  * This means that we can't safely call nfsv4 close on a file until
2923  * the inode is cleared. This in turn means that we are not good
2924  * NFSv4 citizens - we do not indicate to the server to update the file's
2925  * share state even when we are done with one of the three share
2926  * stateid's in the inode.
2927  *
2928  * NOTE: Caller must be holding the sp->so_owner semaphore!
2929  */
2930 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2931 {
2932         struct nfs_server *server = NFS_SERVER(state->inode);
2933         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
2934         struct nfs4_closedata *calldata;
2935         struct nfs4_state_owner *sp = state->owner;
2936         struct rpc_task *task;
2937         struct rpc_message msg = {
2938                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2939                 .rpc_cred = state->owner->so_cred,
2940         };
2941         struct rpc_task_setup task_setup_data = {
2942                 .rpc_client = server->client,
2943                 .rpc_message = &msg,
2944                 .callback_ops = &nfs4_close_ops,
2945                 .workqueue = nfsiod_workqueue,
2946                 .flags = RPC_TASK_ASYNC,
2947         };
2948         int status = -ENOMEM;
2949
2950         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2951                 &task_setup_data.rpc_client, &msg);
2952
2953         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2954         if (calldata == NULL)
2955                 goto out;
2956         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2957         calldata->inode = state->inode;
2958         calldata->state = state;
2959         calldata->arg.fh = NFS_FH(state->inode);
2960         /* Serialization for the sequence id */
2961         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
2962         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2963         if (IS_ERR(calldata->arg.seqid))
2964                 goto out_free_calldata;
2965         calldata->arg.fmode = 0;
2966         calldata->arg.bitmask = server->cache_consistency_bitmask;
2967         calldata->res.fattr = &calldata->fattr;
2968         calldata->res.seqid = calldata->arg.seqid;
2969         calldata->res.server = server;
2970         calldata->roc = nfs4_roc(state->inode);
2971         nfs_sb_active(calldata->inode->i_sb);
2972
2973         msg.rpc_argp = &calldata->arg;
2974         msg.rpc_resp = &calldata->res;
2975         task_setup_data.callback_data = calldata;
2976         task = rpc_run_task(&task_setup_data);
2977         if (IS_ERR(task))
2978                 return PTR_ERR(task);
2979         status = 0;
2980         if (wait)
2981                 status = rpc_wait_for_completion_task(task);
2982         rpc_put_task(task);
2983         return status;
2984 out_free_calldata:
2985         kfree(calldata);
2986 out:
2987         nfs4_put_open_state(state);
2988         nfs4_put_state_owner(sp);
2989         return status;
2990 }
2991
2992 static struct inode *
2993 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2994                 int open_flags, struct iattr *attr, int *opened)
2995 {
2996         struct nfs4_state *state;
2997         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2998
2999         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3000
3001         /* Protect against concurrent sillydeletes */
3002         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3003
3004         nfs4_label_release_security(label);
3005
3006         if (IS_ERR(state))
3007                 return ERR_CAST(state);
3008         return state->inode;
3009 }
3010
3011 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3012 {
3013         if (ctx->state == NULL)
3014                 return;
3015         if (is_sync)
3016                 nfs4_close_sync(ctx->state, ctx->mode);
3017         else
3018                 nfs4_close_state(ctx->state, ctx->mode);
3019 }
3020
3021 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3022 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3023 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
3024
3025 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3026 {
3027         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3028         struct nfs4_server_caps_arg args = {
3029                 .fhandle = fhandle,
3030                 .bitmask = bitmask,
3031         };
3032         struct nfs4_server_caps_res res = {};
3033         struct rpc_message msg = {
3034                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3035                 .rpc_argp = &args,
3036                 .rpc_resp = &res,
3037         };
3038         int status;
3039
3040         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3041                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3042                      FATTR4_WORD0_LINK_SUPPORT |
3043                      FATTR4_WORD0_SYMLINK_SUPPORT |
3044                      FATTR4_WORD0_ACLSUPPORT;
3045         if (minorversion)
3046                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3047
3048         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3049         if (status == 0) {
3050                 /* Sanity check the server answers */
3051                 switch (minorversion) {
3052                 case 0:
3053                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3054                         res.attr_bitmask[2] = 0;
3055                         break;
3056                 case 1:
3057                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3058                         break;
3059                 case 2:
3060                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3061                 }
3062                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3063                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3064                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3065                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3066                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3067                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
3068                                 NFS_CAP_SECURITY_LABEL);
3069                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3070                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3071                         server->caps |= NFS_CAP_ACLS;
3072                 if (res.has_links != 0)
3073                         server->caps |= NFS_CAP_HARDLINKS;
3074                 if (res.has_symlinks != 0)
3075                         server->caps |= NFS_CAP_SYMLINKS;
3076                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3077                         server->caps |= NFS_CAP_FILEID;
3078                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3079                         server->caps |= NFS_CAP_MODE;
3080                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3081                         server->caps |= NFS_CAP_NLINK;
3082                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3083                         server->caps |= NFS_CAP_OWNER;
3084                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3085                         server->caps |= NFS_CAP_OWNER_GROUP;
3086                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3087                         server->caps |= NFS_CAP_ATIME;
3088                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3089                         server->caps |= NFS_CAP_CTIME;
3090                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3091                         server->caps |= NFS_CAP_MTIME;
3092 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3093                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3094                         server->caps |= NFS_CAP_SECURITY_LABEL;
3095 #endif
3096                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3097                                 sizeof(server->attr_bitmask));
3098                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3099
3100                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3101                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3102                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3103                 server->cache_consistency_bitmask[2] = 0;
3104                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3105                         sizeof(server->exclcreat_bitmask));
3106                 server->acl_bitmask = res.acl_bitmask;
3107                 server->fh_expire_type = res.fh_expire_type;
3108         }
3109
3110         return status;
3111 }
3112
3113 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3114 {
3115         struct nfs4_exception exception = { };
3116         int err;
3117         do {
3118                 err = nfs4_handle_exception(server,
3119                                 _nfs4_server_capabilities(server, fhandle),
3120                                 &exception);
3121         } while (exception.retry);
3122         return err;
3123 }
3124
3125 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3126                 struct nfs_fsinfo *info)
3127 {
3128         u32 bitmask[3];
3129         struct nfs4_lookup_root_arg args = {
3130                 .bitmask = bitmask,
3131         };
3132         struct nfs4_lookup_res res = {
3133                 .server = server,
3134                 .fattr = info->fattr,
3135                 .fh = fhandle,
3136         };
3137         struct rpc_message msg = {
3138                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3139                 .rpc_argp = &args,
3140                 .rpc_resp = &res,
3141         };
3142
3143         bitmask[0] = nfs4_fattr_bitmap[0];
3144         bitmask[1] = nfs4_fattr_bitmap[1];
3145         /*
3146          * Process the label in the upcoming getfattr
3147          */
3148         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3149
3150         nfs_fattr_init(info->fattr);
3151         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3152 }
3153
3154 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3155                 struct nfs_fsinfo *info)
3156 {
3157         struct nfs4_exception exception = { };
3158         int err;
3159         do {
3160                 err = _nfs4_lookup_root(server, fhandle, info);
3161                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3162                 switch (err) {
3163                 case 0:
3164                 case -NFS4ERR_WRONGSEC:
3165                         goto out;
3166                 default:
3167                         err = nfs4_handle_exception(server, err, &exception);
3168                 }
3169         } while (exception.retry);
3170 out:
3171         return err;
3172 }
3173
3174 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3175                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3176 {
3177         struct rpc_auth_create_args auth_args = {
3178                 .pseudoflavor = flavor,
3179         };
3180         struct rpc_auth *auth;
3181         int ret;
3182
3183         auth = rpcauth_create(&auth_args, server->client);
3184         if (IS_ERR(auth)) {
3185                 ret = -EACCES;
3186                 goto out;
3187         }
3188         ret = nfs4_lookup_root(server, fhandle, info);
3189 out:
3190         return ret;
3191 }
3192
3193 /*
3194  * Retry pseudoroot lookup with various security flavors.  We do this when:
3195  *
3196  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3197  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3198  *
3199  * Returns zero on success, or a negative NFS4ERR value, or a
3200  * negative errno value.
3201  */
3202 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3203                               struct nfs_fsinfo *info)
3204 {
3205         /* Per 3530bis 15.33.5 */
3206         static const rpc_authflavor_t flav_array[] = {
3207                 RPC_AUTH_GSS_KRB5P,
3208                 RPC_AUTH_GSS_KRB5I,
3209                 RPC_AUTH_GSS_KRB5,
3210                 RPC_AUTH_UNIX,                  /* courtesy */
3211                 RPC_AUTH_NULL,
3212         };
3213         int status = -EPERM;
3214         size_t i;
3215
3216         if (server->auth_info.flavor_len > 0) {
3217                 /* try each flavor specified by user */
3218                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3219                         status = nfs4_lookup_root_sec(server, fhandle, info,
3220                                                 server->auth_info.flavors[i]);
3221                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3222                                 continue;
3223                         break;
3224                 }
3225         } else {
3226                 /* no flavors specified by user, try default list */
3227                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3228                         status = nfs4_lookup_root_sec(server, fhandle, info,
3229                                                       flav_array[i]);
3230                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3231                                 continue;
3232                         break;
3233                 }
3234         }
3235
3236         /*
3237          * -EACCESS could mean that the user doesn't have correct permissions
3238          * to access the mount.  It could also mean that we tried to mount
3239          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3240          * existing mount programs don't handle -EACCES very well so it should
3241          * be mapped to -EPERM instead.
3242          */
3243         if (status == -EACCES)
3244                 status = -EPERM;
3245         return status;
3246 }
3247
3248 static int nfs4_do_find_root_sec(struct nfs_server *server,
3249                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3250 {
3251         int mv = server->nfs_client->cl_minorversion;
3252         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3253 }
3254
3255 /**
3256  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3257  * @server: initialized nfs_server handle
3258  * @fhandle: we fill in the pseudo-fs root file handle
3259  * @info: we fill in an FSINFO struct
3260  * @auth_probe: probe the auth flavours
3261  *
3262  * Returns zero on success, or a negative errno.
3263  */
3264 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3265                          struct nfs_fsinfo *info,
3266                          bool auth_probe)
3267 {
3268         int status = 0;
3269
3270         if (!auth_probe)
3271                 status = nfs4_lookup_root(server, fhandle, info);
3272
3273         if (auth_probe || status == NFS4ERR_WRONGSEC)
3274                 status = nfs4_do_find_root_sec(server, fhandle, info);
3275
3276         if (status == 0)
3277                 status = nfs4_server_capabilities(server, fhandle);
3278         if (status == 0)
3279                 status = nfs4_do_fsinfo(server, fhandle, info);
3280
3281         return nfs4_map_errors(status);
3282 }
3283
3284 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3285                               struct nfs_fsinfo *info)
3286 {
3287         int error;
3288         struct nfs_fattr *fattr = info->fattr;
3289         struct nfs4_label *label = NULL;
3290
3291         error = nfs4_server_capabilities(server, mntfh);
3292         if (error < 0) {
3293                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3294                 return error;
3295         }
3296
3297         label = nfs4_label_alloc(server, GFP_KERNEL);
3298         if (IS_ERR(label))
3299                 return PTR_ERR(label);
3300
3301         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3302         if (error < 0) {
3303                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3304                 goto err_free_label;
3305         }
3306
3307         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3308             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3309                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3310
3311 err_free_label:
3312         nfs4_label_free(label);
3313
3314         return error;
3315 }
3316
3317 /*
3318  * Get locations and (maybe) other attributes of a referral.
3319  * Note that we'll actually follow the referral later when
3320  * we detect fsid mismatch in inode revalidation
3321  */
3322 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3323                              const struct qstr *name, struct nfs_fattr *fattr,
3324                              struct nfs_fh *fhandle)
3325 {
3326         int status = -ENOMEM;
3327         struct page *page = NULL;
3328         struct nfs4_fs_locations *locations = NULL;
3329
3330         page = alloc_page(GFP_KERNEL);
3331         if (page == NULL)
3332                 goto out;
3333         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3334         if (locations == NULL)
3335                 goto out;
3336
3337         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3338         if (status != 0)
3339                 goto out;
3340
3341         /*
3342          * If the fsid didn't change, this is a migration event, not a
3343          * referral.  Cause us to drop into the exception handler, which
3344          * will kick off migration recovery.
3345          */
3346         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3347                 dprintk("%s: server did not return a different fsid for"
3348                         " a referral at %s\n", __func__, name->name);
3349                 status = -NFS4ERR_MOVED;
3350                 goto out;
3351         }
3352         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3353         nfs_fixup_referral_attributes(&locations->fattr);
3354
3355         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3356         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3357         memset(fhandle, 0, sizeof(struct nfs_fh));
3358 out:
3359         if (page)
3360                 __free_page(page);
3361         kfree(locations);
3362         return status;
3363 }
3364
3365 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3366                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3367 {
3368         struct nfs4_getattr_arg args = {
3369                 .fh = fhandle,
3370                 .bitmask = server->attr_bitmask,
3371         };
3372         struct nfs4_getattr_res res = {
3373                 .fattr = fattr,
3374                 .label = label,
3375                 .server = server,
3376         };
3377         struct rpc_message msg = {
3378                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3379                 .rpc_argp = &args,
3380                 .rpc_resp = &res,
3381         };
3382
3383         args.bitmask = nfs4_bitmask(server, label);
3384
3385         nfs_fattr_init(fattr);
3386         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3387 }
3388
3389 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3390                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3391 {
3392         struct nfs4_exception exception = { };
3393         int err;
3394         do {
3395                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3396                 trace_nfs4_getattr(server, fhandle, fattr, err);
3397                 err = nfs4_handle_exception(server, err,
3398                                 &exception);
3399         } while (exception.retry);
3400         return err;
3401 }
3402
3403 /*
3404  * The file is not closed if it is opened due to the a request to change
3405  * the size of the file. The open call will not be needed once the
3406  * VFS layer lookup-intents are implemented.
3407  *
3408  * Close is called when the inode is destroyed.
3409  * If we haven't opened the file for O_WRONLY, we
3410  * need to in the size_change case to obtain a stateid.
3411  *
3412  * Got race?
3413  * Because OPEN is always done by name in nfsv4, it is
3414  * possible that we opened a different file by the same
3415  * name.  We can recognize this race condition, but we
3416  * can't do anything about it besides returning an error.
3417  *
3418  * This will be fixed with VFS changes (lookup-intent).
3419  */
3420 static int
3421 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3422                   struct iattr *sattr)
3423 {
3424         struct inode *inode = d_inode(dentry);
3425         struct rpc_cred *cred = NULL;
3426         struct nfs4_state *state = NULL;
3427         struct nfs4_label *label = NULL;
3428         int status;
3429
3430         if (pnfs_ld_layoutret_on_setattr(inode) &&
3431             sattr->ia_valid & ATTR_SIZE &&
3432             sattr->ia_size < i_size_read(inode))
3433                 pnfs_commit_and_return_layout(inode);
3434
3435         nfs_fattr_init(fattr);
3436
3437         /* Deal with open(O_TRUNC) */
3438         if (sattr->ia_valid & ATTR_OPEN)
3439                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3440
3441         /* Optimization: if the end result is no change, don't RPC */
3442         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3443                 return 0;
3444
3445         /* Search for an existing open(O_WRITE) file */
3446         if (sattr->ia_valid & ATTR_FILE) {
3447                 struct nfs_open_context *ctx;
3448
3449                 ctx = nfs_file_open_context(sattr->ia_file);
3450                 if (ctx) {
3451                         cred = ctx->cred;
3452                         state = ctx->state;
3453                 }
3454         }
3455
3456         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3457         if (IS_ERR(label))
3458                 return PTR_ERR(label);
3459
3460         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3461         if (status == 0) {
3462                 nfs_setattr_update_inode(inode, sattr, fattr);
3463                 nfs_setsecurity(inode, fattr, label);
3464         }
3465         nfs4_label_free(label);
3466         return status;
3467 }
3468
3469 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3470                 const struct qstr *name, struct nfs_fh *fhandle,
3471                 struct nfs_fattr *fattr, struct nfs4_label *label)
3472 {
3473         struct nfs_server *server = NFS_SERVER(dir);
3474         int                    status;
3475         struct nfs4_lookup_arg args = {
3476                 .bitmask = server->attr_bitmask,
3477                 .dir_fh = NFS_FH(dir),
3478                 .name = name,
3479         };
3480         struct nfs4_lookup_res res = {
3481                 .server = server,
3482                 .fattr = fattr,
3483                 .label = label,
3484                 .fh = fhandle,
3485         };
3486         struct rpc_message msg = {
3487                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3488                 .rpc_argp = &args,
3489                 .rpc_resp = &res,
3490         };
3491
3492         args.bitmask = nfs4_bitmask(server, label);
3493
3494         nfs_fattr_init(fattr);
3495
3496         dprintk("NFS call  lookup %s\n", name->name);
3497         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3498         dprintk("NFS reply lookup: %d\n", status);
3499         return status;
3500 }
3501
3502 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3503 {
3504         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3505                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3506         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3507         fattr->nlink = 2;
3508 }
3509
3510 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3511                                    struct qstr *name, struct nfs_fh *fhandle,
3512                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3513 {
3514         struct nfs4_exception exception = { };
3515         struct rpc_clnt *client = *clnt;
3516         int err;
3517         do {
3518                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3519                 trace_nfs4_lookup(dir, name, err);
3520                 switch (err) {
3521                 case -NFS4ERR_BADNAME:
3522                         err = -ENOENT;
3523                         goto out;
3524                 case -NFS4ERR_MOVED:
3525                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3526                         if (err == -NFS4ERR_MOVED)
3527                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3528                         goto out;
3529                 case -NFS4ERR_WRONGSEC:
3530                         err = -EPERM;
3531                         if (client != *clnt)
3532                                 goto out;
3533                         client = nfs4_negotiate_security(client, dir, name);
3534                         if (IS_ERR(client))
3535                                 return PTR_ERR(client);
3536
3537                         exception.retry = 1;
3538                         break;
3539                 default:
3540                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3541                 }
3542         } while (exception.retry);
3543
3544 out:
3545         if (err == 0)
3546                 *clnt = client;
3547         else if (client != *clnt)
3548                 rpc_shutdown_client(client);
3549
3550         return err;
3551 }
3552
3553 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3554                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3555                             struct nfs4_label *label)
3556 {
3557         int status;
3558         struct rpc_clnt *client = NFS_CLIENT(dir);
3559
3560         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3561         if (client != NFS_CLIENT(dir)) {
3562                 rpc_shutdown_client(client);
3563                 nfs_fixup_secinfo_attributes(fattr);
3564         }
3565         return status;
3566 }
3567
3568 struct rpc_clnt *
3569 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3570                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3571 {
3572         struct rpc_clnt *client = NFS_CLIENT(dir);
3573         int status;
3574
3575         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3576         if (status < 0)
3577                 return ERR_PTR(status);
3578         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3579 }
3580
3581 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3582 {
3583         struct nfs_server *server = NFS_SERVER(inode);
3584         struct nfs4_accessargs args = {
3585                 .fh = NFS_FH(inode),
3586                 .bitmask = server->cache_consistency_bitmask,
3587         };
3588         struct nfs4_accessres res = {
3589                 .server = server,
3590         };
3591         struct rpc_message msg = {
3592                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3593                 .rpc_argp = &args,
3594                 .rpc_resp = &res,
3595                 .rpc_cred = entry->cred,
3596         };
3597         int mode = entry->mask;
3598         int status = 0;
3599
3600         /*
3601          * Determine which access bits we want to ask for...
3602          */
3603         if (mode & MAY_READ)
3604                 args.access |= NFS4_ACCESS_READ;
3605         if (S_ISDIR(inode->i_mode)) {
3606                 if (mode & MAY_WRITE)
3607                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3608                 if (mode & MAY_EXEC)
3609                         args.access |= NFS4_ACCESS_LOOKUP;
3610         } else {
3611                 if (mode & MAY_WRITE)
3612                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3613                 if (mode & MAY_EXEC)
3614                         args.access |= NFS4_ACCESS_EXECUTE;
3615         }
3616
3617         res.fattr = nfs_alloc_fattr();
3618         if (res.fattr == NULL)
3619                 return -ENOMEM;
3620
3621         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3622         if (!status) {
3623                 nfs_access_set_mask(entry, res.access);
3624                 nfs_refresh_inode(inode, res.fattr);
3625         }
3626         nfs_free_fattr(res.fattr);
3627         return status;
3628 }
3629
3630 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3631 {
3632         struct nfs4_exception exception = { };
3633         int err;
3634         do {
3635                 err = _nfs4_proc_access(inode, entry);
3636                 trace_nfs4_access(inode, err);
3637                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3638                                 &exception);
3639         } while (exception.retry);
3640         return err;
3641 }
3642
3643 /*
3644  * TODO: For the time being, we don't try to get any attributes
3645  * along with any of the zero-copy operations READ, READDIR,
3646  * READLINK, WRITE.
3647  *
3648  * In the case of the first three, we want to put the GETATTR
3649  * after the read-type operation -- this is because it is hard
3650  * to predict the length of a GETATTR response in v4, and thus
3651  * align the READ data correctly.  This means that the GETATTR
3652  * may end up partially falling into the page cache, and we should
3653  * shift it into the 'tail' of the xdr_buf before processing.
3654  * To do this efficiently, we need to know the total length
3655  * of data received, which doesn't seem to be available outside
3656  * of the RPC layer.
3657  *
3658  * In the case of WRITE, we also want to put the GETATTR after
3659  * the operation -- in this case because we want to make sure
3660  * we get the post-operation mtime and size.
3661  *
3662  * Both of these changes to the XDR layer would in fact be quite
3663  * minor, but I decided to leave them for a subsequent patch.
3664  */
3665 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3666                 unsigned int pgbase, unsigned int pglen)
3667 {
3668         struct nfs4_readlink args = {
3669                 .fh       = NFS_FH(inode),
3670                 .pgbase   = pgbase,
3671                 .pglen    = pglen,
3672                 .pages    = &page,
3673         };
3674         struct nfs4_readlink_res res;
3675         struct rpc_message msg = {
3676                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3677                 .rpc_argp = &args,
3678                 .rpc_resp = &res,
3679         };
3680
3681         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3682 }
3683
3684 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3685                 unsigned int pgbase, unsigned int pglen)
3686 {
3687         struct nfs4_exception exception = { };
3688         int err;
3689         do {
3690                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3691                 trace_nfs4_readlink(inode, err);
3692                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3693                                 &exception);
3694         } while (exception.retry);
3695         return err;
3696 }
3697
3698 /*
3699  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3700  */
3701 static int
3702 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3703                  int flags)
3704 {
3705         struct nfs4_label l, *ilabel = NULL;
3706         struct nfs_open_context *ctx;
3707         struct nfs4_state *state;
3708         int status = 0;
3709
3710         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3711         if (IS_ERR(ctx))
3712                 return PTR_ERR(ctx);
3713
3714         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3715
3716         sattr->ia_mode &= ~current_umask();
3717         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
3718         if (IS_ERR(state)) {
3719                 status = PTR_ERR(state);
3720                 goto out;
3721         }
3722 out:
3723         nfs4_label_release_security(ilabel);
3724         put_nfs_open_context(ctx);
3725         return status;
3726 }
3727
3728 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3729 {
3730         struct nfs_server *server = NFS_SERVER(dir);
3731         struct nfs_removeargs args = {
3732                 .fh = NFS_FH(dir),
3733                 .name = *name,
3734         };
3735         struct nfs_removeres res = {
3736                 .server = server,
3737         };
3738         struct rpc_message msg = {
3739                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3740                 .rpc_argp = &args,
3741                 .rpc_resp = &res,
3742         };
3743         int status;
3744
3745         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3746         if (status == 0)
3747                 update_changeattr(dir, &res.cinfo);
3748         return status;
3749 }
3750
3751 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3752 {
3753         struct nfs4_exception exception = { };
3754         int err;
3755         do {
3756                 err = _nfs4_proc_remove(dir, name);
3757                 trace_nfs4_remove(dir, name, err);
3758                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3759                                 &exception);
3760         } while (exception.retry);
3761         return err;
3762 }
3763
3764 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3765 {
3766         struct nfs_server *server = NFS_SERVER(dir);
3767         struct nfs_removeargs *args = msg->rpc_argp;
3768         struct nfs_removeres *res = msg->rpc_resp;
3769
3770         res->server = server;
3771         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3772         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3773
3774         nfs_fattr_init(res->dir_attr);
3775 }
3776
3777 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3778 {
3779         nfs4_setup_sequence(NFS_SERVER(data->dir),
3780                         &data->args.seq_args,
3781                         &data->res.seq_res,
3782                         task);
3783 }
3784
3785 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3786 {
3787         struct nfs_unlinkdata *data = task->tk_calldata;
3788         struct nfs_removeres *res = &data->res;
3789
3790         if (!nfs4_sequence_done(task, &res->seq_res))
3791                 return 0;
3792         if (nfs4_async_handle_error(task, res->server, NULL,
3793                                     &data->timeout) == -EAGAIN)
3794                 return 0;
3795         update_changeattr(dir, &res->cinfo);
3796         return 1;
3797 }
3798
3799 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3800 {
3801         struct nfs_server *server = NFS_SERVER(dir);
3802         struct nfs_renameargs *arg = msg->rpc_argp;
3803         struct nfs_renameres *res = msg->rpc_resp;
3804
3805         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3806         res->server = server;
3807         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3808 }
3809
3810 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3811 {
3812         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3813                         &data->args.seq_args,
3814                         &data->res.seq_res,
3815                         task);
3816 }
3817
3818 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3819                                  struct inode *new_dir)
3820 {
3821         struct nfs_renamedata *data = task->tk_calldata;
3822         struct nfs_renameres *res = &data->res;
3823
3824         if (!nfs4_sequence_done(task, &res->seq_res))
3825                 return 0;
3826         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3827                 return 0;
3828
3829         update_changeattr(old_dir, &res->old_cinfo);
3830         update_changeattr(new_dir, &res->new_cinfo);
3831         return 1;
3832 }
3833
3834 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3835 {
3836         struct nfs_server *server = NFS_SERVER(inode);
3837         struct nfs4_link_arg arg = {
3838                 .fh     = NFS_FH(inode),
3839                 .dir_fh = NFS_FH(dir),
3840                 .name   = name,
3841                 .bitmask = server->attr_bitmask,
3842         };
3843         struct nfs4_link_res res = {
3844                 .server = server,
3845                 .label = NULL,
3846         };
3847         struct rpc_message msg = {
3848                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3849                 .rpc_argp = &arg,
3850                 .rpc_resp = &res,
3851         };
3852         int status = -ENOMEM;
3853
3854         res.fattr = nfs_alloc_fattr();
3855         if (res.fattr == NULL)
3856                 goto out;
3857
3858         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3859         if (IS_ERR(res.label)) {
3860                 status = PTR_ERR(res.label);
3861                 goto out;
3862         }
3863         arg.bitmask = nfs4_bitmask(server, res.label);
3864
3865         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3866         if (!status) {
3867                 update_changeattr(dir, &res.cinfo);
3868                 status = nfs_post_op_update_inode(inode, res.fattr);
3869                 if (!status)
3870                         nfs_setsecurity(inode, res.fattr, res.label);
3871         }
3872
3873
3874         nfs4_label_free(res.label);
3875
3876 out:
3877         nfs_free_fattr(res.fattr);
3878         return status;
3879 }
3880
3881 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3882 {
3883         struct nfs4_exception exception = { };
3884         int err;
3885         do {
3886                 err = nfs4_handle_exception(NFS_SERVER(inode),
3887                                 _nfs4_proc_link(inode, dir, name),
3888                                 &exception);
3889         } while (exception.retry);
3890         return err;
3891 }
3892
3893 struct nfs4_createdata {
3894         struct rpc_message msg;
3895         struct nfs4_create_arg arg;
3896         struct nfs4_create_res res;
3897         struct nfs_fh fh;
3898         struct nfs_fattr fattr;
3899         struct nfs4_label *label;
3900 };
3901
3902 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3903                 struct qstr *name, struct iattr *sattr, u32 ftype)
3904 {
3905         struct nfs4_createdata *data;
3906
3907         data = kzalloc(sizeof(*data), GFP_KERNEL);
3908         if (data != NULL) {
3909                 struct nfs_server *server = NFS_SERVER(dir);
3910
3911                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3912                 if (IS_ERR(data->label))
3913                         goto out_free;
3914
3915                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3916                 data->msg.rpc_argp = &data->arg;
3917                 data->msg.rpc_resp = &data->res;
3918                 data->arg.dir_fh = NFS_FH(dir);
3919                 data->arg.server = server;
3920                 data->arg.name = name;
3921                 data->arg.attrs = sattr;
3922                 data->arg.ftype = ftype;
3923                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3924                 data->res.server = server;
3925                 data->res.fh = &data->fh;
3926                 data->res.fattr = &data->fattr;
3927                 data->res.label = data->label;
3928                 nfs_fattr_init(data->res.fattr);
3929         }
3930         return data;
3931 out_free:
3932         kfree(data);
3933         return NULL;
3934 }
3935
3936 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3937 {
3938         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3939                                     &data->arg.seq_args, &data->res.seq_res, 1);
3940         if (status == 0) {
3941                 update_changeattr(dir, &data->res.dir_cinfo);
3942                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3943         }
3944         return status;
3945 }
3946
3947 static void nfs4_free_createdata(struct nfs4_createdata *data)
3948 {
3949         nfs4_label_free(data->label);
3950         kfree(data);
3951 }
3952
3953 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3954                 struct page *page, unsigned int len, struct iattr *sattr,
3955                 struct nfs4_label *label)
3956 {
3957         struct nfs4_createdata *data;
3958         int status = -ENAMETOOLONG;
3959
3960         if (len > NFS4_MAXPATHLEN)
3961                 goto out;
3962
3963         status = -ENOMEM;
3964         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3965         if (data == NULL)
3966                 goto out;
3967
3968         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3969         data->arg.u.symlink.pages = &page;
3970         data->arg.u.symlink.len = len;
3971         data->arg.label = label;
3972
3973         status = nfs4_do_create(dir, dentry, data);
3974
3975         nfs4_free_createdata(data);
3976 out:
3977         return status;
3978 }
3979
3980 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3981                 struct page *page, unsigned int len, struct iattr *sattr)
3982 {
3983         struct nfs4_exception exception = { };
3984         struct nfs4_label l, *label = NULL;
3985         int err;
3986
3987         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3988
3989         do {
3990                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3991                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3992                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3993                                 &exception);
3994         } while (exception.retry);
3995
3996         nfs4_label_release_security(label);
3997         return err;
3998 }
3999
4000 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4001                 struct iattr *sattr, struct nfs4_label *label)
4002 {
4003         struct nfs4_createdata *data;
4004         int status = -ENOMEM;
4005
4006         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4007         if (data == NULL)
4008                 goto out;
4009
4010         data->arg.label = label;
4011         status = nfs4_do_create(dir, dentry, data);
4012
4013         nfs4_free_createdata(data);
4014 out:
4015         return status;
4016 }
4017
4018 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4019                 struct iattr *sattr)
4020 {
4021         struct nfs4_exception exception = { };
4022         struct nfs4_label l, *label = NULL;
4023         int err;
4024
4025         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4026
4027         sattr->ia_mode &= ~current_umask();
4028         do {
4029                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4030                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4031                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4032                                 &exception);
4033         } while (exception.retry);
4034         nfs4_label_release_security(label);
4035
4036         return err;
4037 }
4038
4039 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4040                 u64 cookie, struct page **pages, unsigned int count, int plus)
4041 {
4042         struct inode            *dir = d_inode(dentry);
4043         struct nfs4_readdir_arg args = {
4044                 .fh = NFS_FH(dir),
4045                 .pages = pages,
4046                 .pgbase = 0,
4047                 .count = count,
4048                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4049                 .plus = plus,
4050         };
4051         struct nfs4_readdir_res res;
4052         struct rpc_message msg = {
4053                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4054                 .rpc_argp = &args,
4055                 .rpc_resp = &res,
4056                 .rpc_cred = cred,
4057         };
4058         int                     status;
4059
4060         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4061                         dentry,
4062                         (unsigned long long)cookie);
4063         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4064         res.pgbase = args.pgbase;
4065         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4066         if (status >= 0) {
4067                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4068                 status += args.pgbase;
4069         }
4070
4071         nfs_invalidate_atime(dir);
4072
4073         dprintk("%s: returns %d\n", __func__, status);
4074         return status;
4075 }
4076
4077 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4078                 u64 cookie, struct page **pages, unsigned int count, int plus)
4079 {
4080         struct nfs4_exception exception = { };
4081         int err;
4082         do {
4083                 err = _nfs4_proc_readdir(dentry, cred, cookie,
4084                                 pages, count, plus);
4085                 trace_nfs4_readdir(d_inode(dentry), err);
4086                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4087                                 &exception);
4088         } while (exception.retry);
4089         return err;
4090 }
4091
4092 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4093                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4094 {
4095         struct nfs4_createdata *data;
4096         int mode = sattr->ia_mode;
4097         int status = -ENOMEM;
4098
4099         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
4100         if (data == NULL)
4101                 goto out;
4102
4103         if (S_ISFIFO(mode))
4104                 data->arg.ftype = NF4FIFO;
4105         else if (S_ISBLK(mode)) {
4106                 data->arg.ftype = NF4BLK;
4107                 data->arg.u.device.specdata1 = MAJOR(rdev);
4108                 data->arg.u.device.specdata2 = MINOR(rdev);
4109         }
4110         else if (S_ISCHR(mode)) {
4111                 data->arg.ftype = NF4CHR;
4112                 data->arg.u.device.specdata1 = MAJOR(rdev);
4113                 data->arg.u.device.specdata2 = MINOR(rdev);
4114         } else if (!S_ISSOCK(mode)) {
4115                 status = -EINVAL;
4116                 goto out_free;
4117         }
4118
4119         data->arg.label = label;
4120         status = nfs4_do_create(dir, dentry, data);
4121 out_free:
4122         nfs4_free_createdata(data);
4123 out:
4124         return status;
4125 }
4126
4127 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4128                 struct iattr *sattr, dev_t rdev)
4129 {
4130         struct nfs4_exception exception = { };
4131         struct nfs4_label l, *label = NULL;
4132         int err;
4133
4134         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4135
4136         sattr->ia_mode &= ~current_umask();
4137         do {
4138                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4139                 trace_nfs4_mknod(dir, &dentry->d_name, err);
4140                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4141                                 &exception);
4142         } while (exception.retry);
4143
4144         nfs4_label_release_security(label);
4145
4146         return err;
4147 }
4148
4149 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
4150                  struct nfs_fsstat *fsstat)
4151 {
4152         struct nfs4_statfs_arg args = {
4153                 .fh = fhandle,
4154                 .bitmask = server->attr_bitmask,
4155         };
4156         struct nfs4_statfs_res res = {
4157                 .fsstat = fsstat,
4158         };
4159         struct rpc_message msg = {
4160                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
4161                 .rpc_argp = &args,
4162                 .rpc_resp = &res,
4163         };
4164
4165         nfs_fattr_init(fsstat->fattr);
4166         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4167 }
4168
4169 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4170 {
4171         struct nfs4_exception exception = { };
4172         int err;
4173         do {
4174                 err = nfs4_handle_exception(server,
4175                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4176                                 &exception);
4177         } while (exception.retry);
4178         return err;
4179 }
4180
4181 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4182                 struct nfs_fsinfo *fsinfo)
4183 {
4184         struct nfs4_fsinfo_arg args = {
4185                 .fh = fhandle,
4186                 .bitmask = server->attr_bitmask,
4187         };
4188         struct nfs4_fsinfo_res res = {
4189                 .fsinfo = fsinfo,
4190         };
4191         struct rpc_message msg = {
4192                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4193                 .rpc_argp = &args,
4194                 .rpc_resp = &res,
4195         };
4196
4197         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4198 }
4199
4200 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4201 {
4202         struct nfs4_exception exception = { };
4203         unsigned long now = jiffies;
4204         int err;
4205
4206         do {
4207                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4208                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4209                 if (err == 0) {
4210                         struct nfs_client *clp = server->nfs_client;
4211
4212                         spin_lock(&clp->cl_lock);
4213                         clp->cl_lease_time = fsinfo->lease_time * HZ;
4214                         clp->cl_last_renewal = now;
4215                         spin_unlock(&clp->cl_lock);
4216                         break;
4217                 }
4218                 err = nfs4_handle_exception(server, err, &exception);
4219         } while (exception.retry);
4220         return err;
4221 }
4222
4223 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4224 {
4225         int error;
4226
4227         nfs_fattr_init(fsinfo->fattr);
4228         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4229         if (error == 0) {
4230                 /* block layout checks this! */
4231                 server->pnfs_blksize = fsinfo->blksize;
4232                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4233         }
4234
4235         return error;
4236 }
4237
4238 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4239                 struct nfs_pathconf *pathconf)
4240 {
4241         struct nfs4_pathconf_arg args = {
4242                 .fh = fhandle,
4243                 .bitmask = server->attr_bitmask,
4244         };
4245         struct nfs4_pathconf_res res = {
4246                 .pathconf = pathconf,
4247         };
4248         struct rpc_message msg = {
4249                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4250                 .rpc_argp = &args,
4251                 .rpc_resp = &res,
4252         };
4253
4254         /* None of the pathconf attributes are mandatory to implement */
4255         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4256                 memset(pathconf, 0, sizeof(*pathconf));
4257                 return 0;
4258         }
4259
4260         nfs_fattr_init(pathconf->fattr);
4261         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4262 }
4263
4264 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4265                 struct nfs_pathconf *pathconf)
4266 {
4267         struct nfs4_exception exception = { };
4268         int err;
4269
4270         do {
4271                 err = nfs4_handle_exception(server,
4272                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4273                                 &exception);
4274         } while (exception.retry);
4275         return err;
4276 }
4277
4278 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4279                 const struct nfs_open_context *ctx,
4280                 const struct nfs_lock_context *l_ctx,
4281                 fmode_t fmode)
4282 {
4283         const struct nfs_lockowner *lockowner = NULL;
4284
4285         if (l_ctx != NULL)
4286                 lockowner = &l_ctx->lockowner;
4287         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4288 }
4289 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4290
4291 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4292                 const struct nfs_open_context *ctx,
4293                 const struct nfs_lock_context *l_ctx,
4294                 fmode_t fmode)
4295 {
4296         nfs4_stateid current_stateid;
4297
4298         /* If the current stateid represents a lost lock, then exit */
4299         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4300                 return true;
4301         return nfs4_stateid_match(stateid, &current_stateid);
4302 }
4303
4304 static bool nfs4_error_stateid_expired(int err)
4305 {
4306         switch (err) {
4307         case -NFS4ERR_DELEG_REVOKED:
4308         case -NFS4ERR_ADMIN_REVOKED:
4309         case -NFS4ERR_BAD_STATEID:
4310         case -NFS4ERR_STALE_STATEID:
4311         case -NFS4ERR_OLD_STATEID:
4312         case -NFS4ERR_OPENMODE:
4313         case -NFS4ERR_EXPIRED:
4314                 return true;
4315         }
4316         return false;
4317 }
4318
4319 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4320 {
4321         nfs_invalidate_atime(hdr->inode);
4322 }
4323
4324 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4325 {
4326         struct nfs_server *server = NFS_SERVER(hdr->inode);
4327
4328         trace_nfs4_read(hdr, task->tk_status);
4329         if (nfs4_async_handle_error(task, server,
4330                                     hdr->args.context->state,
4331                                     NULL) == -EAGAIN) {
4332                 rpc_restart_call_prepare(task);
4333                 return -EAGAIN;
4334         }
4335
4336         __nfs4_read_done_cb(hdr);
4337         if (task->tk_status > 0)
4338                 renew_lease(server, hdr->timestamp);
4339         return 0;
4340 }
4341
4342 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4343                 struct nfs_pgio_args *args)
4344 {
4345
4346         if (!nfs4_error_stateid_expired(task->tk_status) ||
4347                 nfs4_stateid_is_current(&args->stateid,
4348                                 args->context,
4349                                 args->lock_context,
4350                                 FMODE_READ))
4351                 return false;
4352         rpc_restart_call_prepare(task);
4353         return true;
4354 }
4355
4356 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4357 {
4358
4359         dprintk("--> %s\n", __func__);
4360
4361         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4362                 return -EAGAIN;
4363         if (nfs4_read_stateid_changed(task, &hdr->args))
4364                 return -EAGAIN;
4365         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4366                                     nfs4_read_done_cb(task, hdr);
4367 }
4368
4369 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4370                                  struct rpc_message *msg)
4371 {
4372         hdr->timestamp   = jiffies;
4373         hdr->pgio_done_cb = nfs4_read_done_cb;
4374         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4375         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4376 }
4377
4378 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4379                                       struct nfs_pgio_header *hdr)
4380 {
4381         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4382                         &hdr->args.seq_args,
4383                         &hdr->res.seq_res,
4384                         task))
4385                 return 0;
4386         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4387                                 hdr->args.lock_context,
4388                                 hdr->rw_ops->rw_mode) == -EIO)
4389                 return -EIO;
4390         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4391                 return -EIO;
4392         return 0;
4393 }
4394
4395 static int nfs4_write_done_cb(struct rpc_task *task,
4396                               struct nfs_pgio_header *hdr)
4397 {
4398         struct inode *inode = hdr->inode;
4399
4400         trace_nfs4_write(hdr, task->tk_status);
4401         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4402                                     hdr->args.context->state,
4403                                     NULL) == -EAGAIN) {
4404                 rpc_restart_call_prepare(task);
4405                 return -EAGAIN;
4406         }
4407         if (task->tk_status >= 0) {
4408                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4409                 nfs_writeback_update_inode(hdr);
4410         }
4411         return 0;
4412 }
4413
4414 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4415                 struct nfs_pgio_args *args)
4416 {
4417
4418         if (!nfs4_error_stateid_expired(task->tk_status) ||
4419                 nfs4_stateid_is_current(&args->stateid,
4420                                 args->context,
4421                                 args->lock_context,
4422                                 FMODE_WRITE))
4423                 return false;
4424         rpc_restart_call_prepare(task);
4425         return true;
4426 }
4427
4428 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4429 {
4430         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4431                 return -EAGAIN;
4432         if (nfs4_write_stateid_changed(task, &hdr->args))
4433                 return -EAGAIN;
4434         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4435                 nfs4_write_done_cb(task, hdr);
4436 }
4437
4438 static
4439 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4440 {
4441         /* Don't request attributes for pNFS or O_DIRECT writes */
4442         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4443                 return false;
4444         /* Otherwise, request attributes if and only if we don't hold
4445          * a delegation
4446          */
4447         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4448 }
4449
4450 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4451                                   struct rpc_message *msg)
4452 {
4453         struct nfs_server *server = NFS_SERVER(hdr->inode);
4454
4455         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4456                 hdr->args.bitmask = NULL;
4457                 hdr->res.fattr = NULL;
4458         } else
4459                 hdr->args.bitmask = server->cache_consistency_bitmask;
4460
4461         if (!hdr->pgio_done_cb)
4462                 hdr->pgio_done_cb = nfs4_write_done_cb;
4463         hdr->res.server = server;
4464         hdr->timestamp   = jiffies;
4465
4466         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4467         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4468 }
4469
4470 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4471 {
4472         nfs4_setup_sequence(NFS_SERVER(data->inode),
4473                         &data->args.seq_args,
4474                         &data->res.seq_res,
4475                         task);
4476 }
4477
4478 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4479 {
4480         struct inode *inode = data->inode;
4481
4482         trace_nfs4_commit(data, task->tk_status);
4483         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4484                                     NULL, NULL) == -EAGAIN) {
4485                 rpc_restart_call_prepare(task);
4486                 return -EAGAIN;
4487         }
4488         return 0;
4489 }
4490
4491 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4492 {
4493         if (!nfs4_sequence_done(task, &data->res.seq_res))
4494                 return -EAGAIN;
4495         return data->commit_done_cb(task, data);
4496 }
4497
4498 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4499 {
4500         struct nfs_server *server = NFS_SERVER(data->inode);
4501
4502         if (data->commit_done_cb == NULL)
4503                 data->commit_done_cb = nfs4_commit_done_cb;
4504         data->res.server = server;
4505         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4506         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4507 }
4508
4509 struct nfs4_renewdata {
4510         struct nfs_client       *client;
4511         unsigned long           timestamp;
4512 };
4513
4514 /*
4515  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4516  * standalone procedure for queueing an asynchronous RENEW.
4517  */
4518 static void nfs4_renew_release(void *calldata)
4519 {
4520         struct nfs4_renewdata *data = calldata;
4521         struct nfs_client *clp = data->client;
4522
4523         if (atomic_read(&clp->cl_count) > 1)
4524                 nfs4_schedule_state_renewal(clp);
4525         nfs_put_client(clp);
4526         kfree(data);
4527 }
4528
4529 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4530 {
4531         struct nfs4_renewdata *data = calldata;
4532         struct nfs_client *clp = data->client;
4533         unsigned long timestamp = data->timestamp;
4534
4535         trace_nfs4_renew_async(clp, task->tk_status);
4536         switch (task->tk_status) {
4537         case 0:
4538                 break;
4539         case -NFS4ERR_LEASE_MOVED:
4540                 nfs4_schedule_lease_moved_recovery(clp);
4541                 break;
4542         default:
4543                 /* Unless we're shutting down, schedule state recovery! */
4544                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4545                         return;
4546                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4547                         nfs4_schedule_lease_recovery(clp);
4548                         return;
4549                 }
4550                 nfs4_schedule_path_down_recovery(clp);
4551         }
4552         do_renew_lease(clp, timestamp);
4553 }
4554
4555 static const struct rpc_call_ops nfs4_renew_ops = {
4556         .rpc_call_done = nfs4_renew_done,
4557         .rpc_release = nfs4_renew_release,
4558 };
4559
4560 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4561 {
4562         struct rpc_message msg = {
4563                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4564                 .rpc_argp       = clp,
4565                 .rpc_cred       = cred,
4566         };
4567         struct nfs4_renewdata *data;
4568
4569         if (renew_flags == 0)
4570                 return 0;
4571         if (!atomic_inc_not_zero(&clp->cl_count))
4572                 return -EIO;
4573         data = kmalloc(sizeof(*data), GFP_NOFS);
4574         if (data == NULL)
4575                 return -ENOMEM;
4576         data->client = clp;
4577         data->timestamp = jiffies;
4578         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4579                         &nfs4_renew_ops, data);
4580 }
4581
4582 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4583 {
4584         struct rpc_message msg = {
4585                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4586                 .rpc_argp       = clp,
4587                 .rpc_cred       = cred,
4588         };
4589         unsigned long now = jiffies;
4590         int status;
4591
4592         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4593         if (status < 0)
4594                 return status;
4595         do_renew_lease(clp, now);
4596         return 0;
4597 }
4598
4599 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4600 {
4601         return server->caps & NFS_CAP_ACLS;
4602 }
4603
4604 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4605  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4606  * the stack.
4607  */
4608 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4609
4610 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4611                 struct page **pages)
4612 {
4613         struct page *newpage, **spages;
4614         int rc = 0;
4615         size_t len;
4616         spages = pages;
4617
4618         do {
4619                 len = min_t(size_t, PAGE_SIZE, buflen);
4620                 newpage = alloc_page(GFP_KERNEL);
4621
4622                 if (newpage == NULL)
4623                         goto unwind;
4624                 memcpy(page_address(newpage), buf, len);
4625                 buf += len;
4626                 buflen -= len;
4627                 *pages++ = newpage;
4628                 rc++;
4629         } while (buflen != 0);
4630
4631         return rc;
4632
4633 unwind:
4634         for(; rc > 0; rc--)
4635                 __free_page(spages[rc-1]);
4636         return -ENOMEM;
4637 }
4638
4639 struct nfs4_cached_acl {
4640         int cached;
4641         size_t len;
4642         char data[0];
4643 };
4644
4645 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4646 {
4647         struct nfs_inode *nfsi = NFS_I(inode);
4648
4649         spin_lock(&inode->i_lock);
4650         kfree(nfsi->nfs4_acl);
4651         nfsi->nfs4_acl = acl;
4652         spin_unlock(&inode->i_lock);
4653 }
4654
4655 static void nfs4_zap_acl_attr(struct inode *inode)
4656 {
4657         nfs4_set_cached_acl(inode, NULL);
4658 }
4659
4660 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4661 {
4662         struct nfs_inode *nfsi = NFS_I(inode);
4663         struct nfs4_cached_acl *acl;
4664         int ret = -ENOENT;
4665
4666         spin_lock(&inode->i_lock);
4667         acl = nfsi->nfs4_acl;
4668         if (acl == NULL)
4669                 goto out;
4670         if (buf == NULL) /* user is just asking for length */
4671                 goto out_len;
4672         if (acl->cached == 0)
4673                 goto out;
4674         ret = -ERANGE; /* see getxattr(2) man page */
4675         if (acl->len > buflen)
4676                 goto out;
4677         memcpy(buf, acl->data, acl->len);
4678 out_len:
4679         ret = acl->len;
4680 out:
4681         spin_unlock(&inode->i_lock);
4682         return ret;
4683 }
4684
4685 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4686 {
4687         struct nfs4_cached_acl *acl;
4688         size_t buflen = sizeof(*acl) + acl_len;
4689
4690         if (buflen <= PAGE_SIZE) {
4691                 acl = kmalloc(buflen, GFP_KERNEL);
4692                 if (acl == NULL)
4693                         goto out;
4694                 acl->cached = 1;
4695                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4696         } else {
4697                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4698                 if (acl == NULL)
4699                         goto out;
4700                 acl->cached = 0;
4701         }
4702         acl->len = acl_len;
4703 out:
4704         nfs4_set_cached_acl(inode, acl);
4705 }
4706
4707 /*
4708  * The getxattr API returns the required buffer length when called with a
4709  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4710  * the required buf. Cache the result from the first getxattr call to avoid
4711  * sending another RPC.
4712  */
4713 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4714 {
4715         /* enough pages to hold ACL data plus the bitmap and acl length */
4716         struct page *pages[NFS4ACL_MAXPAGES + 1] = {NULL, };
4717         struct nfs_getaclargs args = {
4718                 .fh = NFS_FH(inode),
4719                 /* The xdr layer may allocate pages here. */
4720                 .acl_pages = pages,
4721         };
4722         struct nfs_getaclres res = {
4723                 .acl_len = buflen,
4724         };
4725         struct rpc_message msg = {
4726                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4727                 .rpc_argp = &args,
4728                 .rpc_resp = &res,
4729         };
4730         int ret = -ENOMEM, i;
4731
4732         /*
4733          * There will be some data returned by the server, how much is not
4734          * known yet. Allocate one page and let the XDR layer allocate
4735          * more if needed.
4736          */
4737         pages[0] = alloc_page(GFP_KERNEL);
4738
4739         /* for decoding across pages */
4740         res.acl_scratch = alloc_page(GFP_KERNEL);
4741         if (!res.acl_scratch)
4742                 goto out_free;
4743
4744         args.acl_len = ARRAY_SIZE(pages) << PAGE_SHIFT;
4745
4746         dprintk("%s  buf %p buflen %zu args.acl_len %zu\n",
4747                 __func__, buf, buflen, args.acl_len);
4748         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4749                              &msg, &args.seq_args, &res.seq_res, 0);
4750         if (ret)
4751                 goto out_free;
4752
4753         /* Handle the case where the passed-in buffer is too short */
4754         if (res.acl_flags & NFS4_ACL_TRUNC) {
4755                 /* Did the user only issue a request for the acl length? */
4756                 if (buf == NULL)
4757                         goto out_ok;
4758                 ret = -ERANGE;
4759                 goto out_free;
4760         }
4761         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4762         if (buf) {
4763                 if (res.acl_len > buflen) {
4764                         ret = -ERANGE;
4765                         goto out_free;
4766                 }
4767                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4768         }
4769 out_ok:
4770         ret = res.acl_len;
4771 out_free:
4772         for (i = 0; i < ARRAY_SIZE(pages) && pages[i]; i++)
4773                 if (pages[i])
4774                         __free_page(pages[i]);
4775         if (res.acl_scratch)
4776                 __free_page(res.acl_scratch);
4777         return ret;
4778 }
4779
4780 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4781 {
4782         struct nfs4_exception exception = { };
4783         ssize_t ret;
4784         do {
4785                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4786                 trace_nfs4_get_acl(inode, ret);
4787                 if (ret >= 0)
4788                         break;
4789                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4790         } while (exception.retry);
4791         return ret;
4792 }
4793
4794 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4795 {
4796         struct nfs_server *server = NFS_SERVER(inode);
4797         int ret;
4798
4799         if (!nfs4_server_supports_acls(server))
4800                 return -EOPNOTSUPP;
4801         ret = nfs_revalidate_inode(server, inode);
4802         if (ret < 0)
4803                 return ret;
4804         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4805                 nfs_zap_acl_cache(inode);
4806         ret = nfs4_read_cached_acl(inode, buf, buflen);
4807         if (ret != -ENOENT)
4808                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4809                  * but no cached acl data, just the acl length */
4810                 return ret;
4811         return nfs4_get_acl_uncached(inode, buf, buflen);
4812 }
4813
4814 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4815 {
4816         struct nfs_server *server = NFS_SERVER(inode);
4817         struct page *pages[NFS4ACL_MAXPAGES];
4818         struct nfs_setaclargs arg = {
4819                 .fh             = NFS_FH(inode),
4820                 .acl_pages      = pages,
4821                 .acl_len        = buflen,
4822         };
4823         struct nfs_setaclres res;
4824         struct rpc_message msg = {
4825                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4826                 .rpc_argp       = &arg,
4827                 .rpc_resp       = &res,
4828         };
4829         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4830         int ret, i;
4831
4832         if (!nfs4_server_supports_acls(server))
4833                 return -EOPNOTSUPP;
4834         if (npages > ARRAY_SIZE(pages))
4835                 return -ERANGE;
4836         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
4837         if (i < 0)
4838                 return i;
4839         nfs4_inode_return_delegation(inode);
4840         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4841
4842         /*
4843          * Free each page after tx, so the only ref left is
4844          * held by the network stack
4845          */
4846         for (; i > 0; i--)
4847                 put_page(pages[i-1]);
4848
4849         /*
4850          * Acl update can result in inode attribute update.
4851          * so mark the attribute cache invalid.
4852          */
4853         spin_lock(&inode->i_lock);
4854         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4855         spin_unlock(&inode->i_lock);
4856         nfs_access_zap_cache(inode);
4857         nfs_zap_acl_cache(inode);
4858         return ret;
4859 }
4860
4861 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4862 {
4863         struct nfs4_exception exception = { };
4864         int err;
4865         do {
4866                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4867                 trace_nfs4_set_acl(inode, err);
4868                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4869                                 &exception);
4870         } while (exception.retry);
4871         return err;
4872 }
4873
4874 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4875 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4876                                         size_t buflen)
4877 {
4878         struct nfs_server *server = NFS_SERVER(inode);
4879         struct nfs_fattr fattr;
4880         struct nfs4_label label = {0, 0, buflen, buf};
4881
4882         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4883         struct nfs4_getattr_arg arg = {
4884                 .fh             = NFS_FH(inode),
4885                 .bitmask        = bitmask,
4886         };
4887         struct nfs4_getattr_res res = {
4888                 .fattr          = &fattr,
4889                 .label          = &label,
4890                 .server         = server,
4891         };
4892         struct rpc_message msg = {
4893                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4894                 .rpc_argp       = &arg,
4895                 .rpc_resp       = &res,
4896         };
4897         int ret;
4898
4899         nfs_fattr_init(&fattr);
4900
4901         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4902         if (ret)
4903                 return ret;
4904         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4905                 return -ENOENT;
4906         if (buflen < label.len)
4907                 return -ERANGE;
4908         return 0;
4909 }
4910
4911 static int nfs4_get_security_label(struct inode *inode, void *buf,
4912                                         size_t buflen)
4913 {
4914         struct nfs4_exception exception = { };
4915         int err;
4916
4917         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4918                 return -EOPNOTSUPP;
4919
4920         do {
4921                 err = _nfs4_get_security_label(inode, buf, buflen);
4922                 trace_nfs4_get_security_label(inode, err);
4923                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4924                                 &exception);
4925         } while (exception.retry);
4926         return err;
4927 }
4928
4929 static int _nfs4_do_set_security_label(struct inode *inode,
4930                 struct nfs4_label *ilabel,
4931                 struct nfs_fattr *fattr,
4932                 struct nfs4_label *olabel)
4933 {
4934
4935         struct iattr sattr = {0};
4936         struct nfs_server *server = NFS_SERVER(inode);
4937         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4938         struct nfs_setattrargs arg = {
4939                 .fh             = NFS_FH(inode),
4940                 .iap            = &sattr,
4941                 .server         = server,
4942                 .bitmask        = bitmask,
4943                 .label          = ilabel,
4944         };
4945         struct nfs_setattrres res = {
4946                 .fattr          = fattr,
4947                 .label          = olabel,
4948                 .server         = server,
4949         };
4950         struct rpc_message msg = {
4951                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4952                 .rpc_argp       = &arg,
4953                 .rpc_resp       = &res,
4954         };
4955         int status;
4956
4957         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4958
4959         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4960         if (status)
4961                 dprintk("%s failed: %d\n", __func__, status);
4962
4963         return status;
4964 }
4965
4966 static int nfs4_do_set_security_label(struct inode *inode,
4967                 struct nfs4_label *ilabel,
4968                 struct nfs_fattr *fattr,
4969                 struct nfs4_label *olabel)
4970 {
4971         struct nfs4_exception exception = { };
4972         int err;
4973
4974         do {
4975                 err = _nfs4_do_set_security_label(inode, ilabel,
4976                                 fattr, olabel);
4977                 trace_nfs4_set_security_label(inode, err);
4978                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4979                                 &exception);
4980         } while (exception.retry);
4981         return err;
4982 }
4983
4984 static int
4985 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4986 {
4987         struct nfs4_label ilabel, *olabel = NULL;
4988         struct nfs_fattr fattr;
4989         struct rpc_cred *cred;
4990         struct inode *inode = d_inode(dentry);
4991         int status;
4992
4993         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4994                 return -EOPNOTSUPP;
4995
4996         nfs_fattr_init(&fattr);
4997
4998         ilabel.pi = 0;
4999         ilabel.lfs = 0;
5000         ilabel.label = (char *)buf;
5001         ilabel.len = buflen;
5002
5003         cred = rpc_lookup_cred();
5004         if (IS_ERR(cred))
5005                 return PTR_ERR(cred);
5006
5007         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5008         if (IS_ERR(olabel)) {
5009                 status = -PTR_ERR(olabel);
5010                 goto out;
5011         }
5012
5013         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5014         if (status == 0)
5015                 nfs_setsecurity(inode, &fattr, olabel);
5016
5017         nfs4_label_free(olabel);
5018 out:
5019         put_rpccred(cred);
5020         return status;
5021 }
5022 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
5023
5024
5025 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5026                                     nfs4_verifier *bootverf)
5027 {
5028         __be32 verf[2];
5029
5030         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5031                 /* An impossible timestamp guarantees this value
5032                  * will never match a generated boot time. */
5033                 verf[0] = 0;
5034                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
5035         } else {
5036                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5037                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
5038                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
5039         }
5040         memcpy(bootverf->data, verf, sizeof(bootverf->data));
5041 }
5042
5043 static int
5044 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
5045 {
5046         size_t len;
5047         char *str;
5048
5049         if (clp->cl_owner_id != NULL)
5050                 return 0;
5051
5052         rcu_read_lock();
5053         len = 14 + strlen(clp->cl_ipaddr) + 1 +
5054                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5055                 1 +
5056                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) +
5057                 1;
5058         rcu_read_unlock();
5059
5060         if (len > NFS4_OPAQUE_LIMIT + 1)
5061                 return -EINVAL;
5062
5063         /*
5064          * Since this string is allocated at mount time, and held until the
5065          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5066          * about a memory-reclaim deadlock.
5067          */
5068         str = kmalloc(len, GFP_KERNEL);
5069         if (!str)
5070                 return -ENOMEM;
5071
5072         rcu_read_lock();
5073         scnprintf(str, len, "Linux NFSv4.0 %s/%s %s",
5074                         clp->cl_ipaddr,
5075                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
5076                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO));
5077         rcu_read_unlock();
5078
5079         clp->cl_owner_id = str;
5080         return 0;
5081 }
5082
5083 static int
5084 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
5085 {
5086         size_t len;
5087         char *str;
5088
5089         len = 10 + 10 + 1 + 10 + 1 +
5090                 strlen(nfs4_client_id_uniquifier) + 1 +
5091                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5092
5093         if (len > NFS4_OPAQUE_LIMIT + 1)
5094                 return -EINVAL;
5095
5096         /*
5097          * Since this string is allocated at mount time, and held until the
5098          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5099          * about a memory-reclaim deadlock.
5100          */
5101         str = kmalloc(len, GFP_KERNEL);
5102         if (!str)
5103                 return -ENOMEM;
5104
5105         scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
5106                         clp->rpc_ops->version, clp->cl_minorversion,
5107                         nfs4_client_id_uniquifier,
5108                         clp->cl_rpcclient->cl_nodename);
5109         clp->cl_owner_id = str;
5110         return 0;
5111 }
5112
5113 static int
5114 nfs4_init_uniform_client_string(struct nfs_client *clp)
5115 {
5116         size_t len;
5117         char *str;
5118
5119         if (clp->cl_owner_id != NULL)
5120                 return 0;
5121
5122         if (nfs4_client_id_uniquifier[0] != '\0')
5123                 return nfs4_init_uniquifier_client_string(clp);
5124
5125         len = 10 + 10 + 1 + 10 + 1 +
5126                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5127
5128         if (len > NFS4_OPAQUE_LIMIT + 1)
5129                 return -EINVAL;
5130
5131         /*
5132          * Since this string is allocated at mount time, and held until the
5133          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5134          * about a memory-reclaim deadlock.
5135          */
5136         str = kmalloc(len, GFP_KERNEL);
5137         if (!str)
5138                 return -ENOMEM;
5139
5140         scnprintf(str, len, "Linux NFSv%u.%u %s",
5141                         clp->rpc_ops->version, clp->cl_minorversion,
5142                         clp->cl_rpcclient->cl_nodename);
5143         clp->cl_owner_id = str;
5144         return 0;
5145 }
5146
5147 /*
5148  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5149  * services.  Advertise one based on the address family of the
5150  * clientaddr.
5151  */
5152 static unsigned int
5153 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5154 {
5155         if (strchr(clp->cl_ipaddr, ':') != NULL)
5156                 return scnprintf(buf, len, "tcp6");
5157         else
5158                 return scnprintf(buf, len, "tcp");
5159 }
5160
5161 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5162 {
5163         struct nfs4_setclientid *sc = calldata;
5164
5165         if (task->tk_status == 0)
5166                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5167 }
5168
5169 static const struct rpc_call_ops nfs4_setclientid_ops = {
5170         .rpc_call_done = nfs4_setclientid_done,
5171 };
5172
5173 /**
5174  * nfs4_proc_setclientid - Negotiate client ID
5175  * @clp: state data structure
5176  * @program: RPC program for NFSv4 callback service
5177  * @port: IP port number for NFS4 callback service
5178  * @cred: RPC credential to use for this call
5179  * @res: where to place the result
5180  *
5181  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5182  */
5183 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5184                 unsigned short port, struct rpc_cred *cred,
5185                 struct nfs4_setclientid_res *res)
5186 {
5187         nfs4_verifier sc_verifier;
5188         struct nfs4_setclientid setclientid = {
5189                 .sc_verifier = &sc_verifier,
5190                 .sc_prog = program,
5191                 .sc_clnt = clp,
5192         };
5193         struct rpc_message msg = {
5194                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5195                 .rpc_argp = &setclientid,
5196                 .rpc_resp = res,
5197                 .rpc_cred = cred,
5198         };
5199         struct rpc_task *task;
5200         struct rpc_task_setup task_setup_data = {
5201                 .rpc_client = clp->cl_rpcclient,
5202                 .rpc_message = &msg,
5203                 .callback_ops = &nfs4_setclientid_ops,
5204                 .callback_data = &setclientid,
5205                 .flags = RPC_TASK_TIMEOUT,
5206         };
5207         int status;
5208
5209         /* nfs_client_id4 */
5210         nfs4_init_boot_verifier(clp, &sc_verifier);
5211
5212         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5213                 status = nfs4_init_uniform_client_string(clp);
5214         else
5215                 status = nfs4_init_nonuniform_client_string(clp);
5216
5217         if (status)
5218                 goto out;
5219
5220         /* cb_client4 */
5221         setclientid.sc_netid_len =
5222                                 nfs4_init_callback_netid(clp,
5223                                                 setclientid.sc_netid,
5224                                                 sizeof(setclientid.sc_netid));
5225         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5226                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5227                                 clp->cl_ipaddr, port >> 8, port & 255);
5228
5229         dprintk("NFS call  setclientid auth=%s, '%s'\n",
5230                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5231                 clp->cl_owner_id);
5232         task = rpc_run_task(&task_setup_data);
5233         if (IS_ERR(task)) {
5234                 status = PTR_ERR(task);
5235                 goto out;
5236         }
5237         status = task->tk_status;
5238         if (setclientid.sc_cred) {
5239                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5240                 put_rpccred(setclientid.sc_cred);
5241         }
5242         rpc_put_task(task);
5243 out:
5244         trace_nfs4_setclientid(clp, status);
5245         dprintk("NFS reply setclientid: %d\n", status);
5246         return status;
5247 }
5248
5249 /**
5250  * nfs4_proc_setclientid_confirm - Confirm client ID
5251  * @clp: state data structure
5252  * @res: result of a previous SETCLIENTID
5253  * @cred: RPC credential to use for this call
5254  *
5255  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5256  */
5257 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5258                 struct nfs4_setclientid_res *arg,
5259                 struct rpc_cred *cred)
5260 {
5261         struct rpc_message msg = {
5262                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5263                 .rpc_argp = arg,
5264                 .rpc_cred = cred,
5265         };
5266         int status;
5267
5268         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5269                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5270                 clp->cl_clientid);
5271         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5272         trace_nfs4_setclientid_confirm(clp, status);
5273         dprintk("NFS reply setclientid_confirm: %d\n", status);
5274         return status;
5275 }
5276
5277 struct nfs4_delegreturndata {
5278         struct nfs4_delegreturnargs args;
5279         struct nfs4_delegreturnres res;
5280         struct nfs_fh fh;
5281         nfs4_stateid stateid;
5282         unsigned long timestamp;
5283         struct nfs_fattr fattr;
5284         int rpc_status;
5285         struct inode *inode;
5286         bool roc;
5287         u32 roc_barrier;
5288 };
5289
5290 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5291 {
5292         struct nfs4_delegreturndata *data = calldata;
5293
5294         if (!nfs4_sequence_done(task, &data->res.seq_res))
5295                 return;
5296
5297         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5298         switch (task->tk_status) {
5299         case 0:
5300                 renew_lease(data->res.server, data->timestamp);
5301         case -NFS4ERR_ADMIN_REVOKED:
5302         case -NFS4ERR_DELEG_REVOKED:
5303         case -NFS4ERR_BAD_STATEID:
5304         case -NFS4ERR_OLD_STATEID:
5305         case -NFS4ERR_STALE_STATEID:
5306         case -NFS4ERR_EXPIRED:
5307                 task->tk_status = 0;
5308                 if (data->roc)
5309                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5310                 break;
5311         default:
5312                 if (nfs4_async_handle_error(task, data->res.server,
5313                                             NULL, NULL) == -EAGAIN) {
5314                         rpc_restart_call_prepare(task);
5315                         return;
5316                 }
5317         }
5318         data->rpc_status = task->tk_status;
5319 }
5320
5321 static void nfs4_delegreturn_release(void *calldata)
5322 {
5323         struct nfs4_delegreturndata *data = calldata;
5324         struct inode *inode = data->inode;
5325
5326         if (inode) {
5327                 if (data->roc)
5328                         pnfs_roc_release(inode);
5329                 nfs_iput_and_deactive(inode);
5330         }
5331         kfree(calldata);
5332 }
5333
5334 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5335 {
5336         struct nfs4_delegreturndata *d_data;
5337
5338         d_data = (struct nfs4_delegreturndata *)data;
5339
5340         if (nfs4_wait_on_layoutreturn(d_data->inode, task))
5341                 return;
5342
5343         if (d_data->roc)
5344                 pnfs_roc_get_barrier(d_data->inode, &d_data->roc_barrier);
5345
5346         nfs4_setup_sequence(d_data->res.server,
5347                         &d_data->args.seq_args,
5348                         &d_data->res.seq_res,
5349                         task);
5350 }
5351
5352 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5353         .rpc_call_prepare = nfs4_delegreturn_prepare,
5354         .rpc_call_done = nfs4_delegreturn_done,
5355         .rpc_release = nfs4_delegreturn_release,
5356 };
5357
5358 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5359 {
5360         struct nfs4_delegreturndata *data;
5361         struct nfs_server *server = NFS_SERVER(inode);
5362         struct rpc_task *task;
5363         struct rpc_message msg = {
5364                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5365                 .rpc_cred = cred,
5366         };
5367         struct rpc_task_setup task_setup_data = {
5368                 .rpc_client = server->client,
5369                 .rpc_message = &msg,
5370                 .callback_ops = &nfs4_delegreturn_ops,
5371                 .flags = RPC_TASK_ASYNC,
5372         };
5373         int status = 0;
5374
5375         data = kzalloc(sizeof(*data), GFP_NOFS);
5376         if (data == NULL)
5377                 return -ENOMEM;
5378         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5379
5380         nfs4_state_protect(server->nfs_client,
5381                         NFS_SP4_MACH_CRED_CLEANUP,
5382                         &task_setup_data.rpc_client, &msg);
5383
5384         data->args.fhandle = &data->fh;
5385         data->args.stateid = &data->stateid;
5386         data->args.bitmask = server->cache_consistency_bitmask;
5387         nfs_copy_fh(&data->fh, NFS_FH(inode));
5388         nfs4_stateid_copy(&data->stateid, stateid);
5389         data->res.fattr = &data->fattr;
5390         data->res.server = server;
5391         nfs_fattr_init(data->res.fattr);
5392         data->timestamp = jiffies;
5393         data->rpc_status = 0;
5394         data->inode = nfs_igrab_and_active(inode);
5395         if (data->inode)
5396                 data->roc = nfs4_roc(inode);
5397
5398         task_setup_data.callback_data = data;
5399         msg.rpc_argp = &data->args;
5400         msg.rpc_resp = &data->res;
5401         task = rpc_run_task(&task_setup_data);
5402         if (IS_ERR(task))
5403                 return PTR_ERR(task);
5404         if (!issync)
5405                 goto out;
5406         status = nfs4_wait_for_completion_rpc_task(task);
5407         if (status != 0)
5408                 goto out;
5409         status = data->rpc_status;
5410         if (status == 0)
5411                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5412         else
5413                 nfs_refresh_inode(inode, &data->fattr);
5414 out:
5415         rpc_put_task(task);
5416         return status;
5417 }
5418
5419 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5420 {
5421         struct nfs_server *server = NFS_SERVER(inode);
5422         struct nfs4_exception exception = { };
5423         int err;
5424         do {
5425                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5426                 trace_nfs4_delegreturn(inode, stateid, err);
5427                 switch (err) {
5428                         case -NFS4ERR_STALE_STATEID:
5429                         case -NFS4ERR_EXPIRED:
5430                         case 0:
5431                                 return 0;
5432                 }
5433                 err = nfs4_handle_exception(server, err, &exception);
5434         } while (exception.retry);
5435         return err;
5436 }
5437
5438 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5439 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5440
5441 /*
5442  * sleep, with exponential backoff, and retry the LOCK operation.
5443  */
5444 static unsigned long
5445 nfs4_set_lock_task_retry(unsigned long timeout)
5446 {
5447         freezable_schedule_timeout_killable_unsafe(timeout);
5448         timeout <<= 1;
5449         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5450                 return NFS4_LOCK_MAXTIMEOUT;
5451         return timeout;
5452 }
5453
5454 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5455 {
5456         struct inode *inode = state->inode;
5457         struct nfs_server *server = NFS_SERVER(inode);
5458         struct nfs_client *clp = server->nfs_client;
5459         struct nfs_lockt_args arg = {
5460                 .fh = NFS_FH(inode),
5461                 .fl = request,
5462         };
5463         struct nfs_lockt_res res = {
5464                 .denied = request,
5465         };
5466         struct rpc_message msg = {
5467                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5468                 .rpc_argp       = &arg,
5469                 .rpc_resp       = &res,
5470                 .rpc_cred       = state->owner->so_cred,
5471         };
5472         struct nfs4_lock_state *lsp;
5473         int status;
5474
5475         arg.lock_owner.clientid = clp->cl_clientid;
5476         status = nfs4_set_lock_state(state, request);
5477         if (status != 0)
5478                 goto out;
5479         lsp = request->fl_u.nfs4_fl.owner;
5480         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5481         arg.lock_owner.s_dev = server->s_dev;
5482         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5483         switch (status) {
5484                 case 0:
5485                         request->fl_type = F_UNLCK;
5486                         break;
5487                 case -NFS4ERR_DENIED:
5488                         status = 0;
5489         }
5490         request->fl_ops->fl_release_private(request);
5491         request->fl_ops = NULL;
5492 out:
5493         return status;
5494 }
5495
5496 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5497 {
5498         struct nfs4_exception exception = { };
5499         int err;
5500
5501         do {
5502                 err = _nfs4_proc_getlk(state, cmd, request);
5503                 trace_nfs4_get_lock(request, state, cmd, err);
5504                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5505                                 &exception);
5506         } while (exception.retry);
5507         return err;
5508 }
5509
5510 static int do_vfs_lock(struct inode *inode, struct file_lock *fl)
5511 {
5512         return locks_lock_inode_wait(inode, fl);
5513 }
5514
5515 struct nfs4_unlockdata {
5516         struct nfs_locku_args arg;
5517         struct nfs_locku_res res;
5518         struct nfs4_lock_state *lsp;
5519         struct nfs_open_context *ctx;
5520         struct file_lock fl;
5521         struct nfs_server *server;
5522         unsigned long timestamp;
5523 };
5524
5525 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5526                 struct nfs_open_context *ctx,
5527                 struct nfs4_lock_state *lsp,
5528                 struct nfs_seqid *seqid)
5529 {
5530         struct nfs4_unlockdata *p;
5531         struct inode *inode = lsp->ls_state->inode;
5532
5533         p = kzalloc(sizeof(*p), GFP_NOFS);
5534         if (p == NULL)
5535                 return NULL;
5536         p->arg.fh = NFS_FH(inode);
5537         p->arg.fl = &p->fl;
5538         p->arg.seqid = seqid;
5539         p->res.seqid = seqid;
5540         p->lsp = lsp;
5541         atomic_inc(&lsp->ls_count);
5542         /* Ensure we don't close file until we're done freeing locks! */
5543         p->ctx = get_nfs_open_context(ctx);
5544         memcpy(&p->fl, fl, sizeof(p->fl));
5545         p->server = NFS_SERVER(inode);
5546         return p;
5547 }
5548
5549 static void nfs4_locku_release_calldata(void *data)
5550 {
5551         struct nfs4_unlockdata *calldata = data;
5552         nfs_free_seqid(calldata->arg.seqid);
5553         nfs4_put_lock_state(calldata->lsp);
5554         put_nfs_open_context(calldata->ctx);
5555         kfree(calldata);
5556 }
5557
5558 static void nfs4_locku_done(struct rpc_task *task, void *data)
5559 {
5560         struct nfs4_unlockdata *calldata = data;
5561
5562         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5563                 return;
5564         switch (task->tk_status) {
5565                 case 0:
5566                         renew_lease(calldata->server, calldata->timestamp);
5567                         do_vfs_lock(calldata->lsp->ls_state->inode, &calldata->fl);
5568                         if (nfs4_update_lock_stateid(calldata->lsp,
5569                                         &calldata->res.stateid))
5570                                 break;
5571                 case -NFS4ERR_BAD_STATEID:
5572                 case -NFS4ERR_OLD_STATEID:
5573                 case -NFS4ERR_STALE_STATEID:
5574                 case -NFS4ERR_EXPIRED:
5575                         if (!nfs4_stateid_match(&calldata->arg.stateid,
5576                                                 &calldata->lsp->ls_stateid))
5577                                 rpc_restart_call_prepare(task);
5578                         break;
5579                 default:
5580                         if (nfs4_async_handle_error(task, calldata->server,
5581                                                     NULL, NULL) == -EAGAIN)
5582                                 rpc_restart_call_prepare(task);
5583         }
5584         nfs_release_seqid(calldata->arg.seqid);
5585 }
5586
5587 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5588 {
5589         struct nfs4_unlockdata *calldata = data;
5590
5591         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5592                 goto out_wait;
5593         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5594         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5595                 /* Note: exit _without_ running nfs4_locku_done */
5596                 goto out_no_action;
5597         }
5598         calldata->timestamp = jiffies;
5599         if (nfs4_setup_sequence(calldata->server,
5600                                 &calldata->arg.seq_args,
5601                                 &calldata->res.seq_res,
5602                                 task) != 0)
5603                 nfs_release_seqid(calldata->arg.seqid);
5604         return;
5605 out_no_action:
5606         task->tk_action = NULL;
5607 out_wait:
5608         nfs4_sequence_done(task, &calldata->res.seq_res);
5609 }
5610
5611 static const struct rpc_call_ops nfs4_locku_ops = {
5612         .rpc_call_prepare = nfs4_locku_prepare,
5613         .rpc_call_done = nfs4_locku_done,
5614         .rpc_release = nfs4_locku_release_calldata,
5615 };
5616
5617 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5618                 struct nfs_open_context *ctx,
5619                 struct nfs4_lock_state *lsp,
5620                 struct nfs_seqid *seqid)
5621 {
5622         struct nfs4_unlockdata *data;
5623         struct rpc_message msg = {
5624                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5625                 .rpc_cred = ctx->cred,
5626         };
5627         struct rpc_task_setup task_setup_data = {
5628                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5629                 .rpc_message = &msg,
5630                 .callback_ops = &nfs4_locku_ops,
5631                 .workqueue = nfsiod_workqueue,
5632                 .flags = RPC_TASK_ASYNC,
5633         };
5634
5635         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5636                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5637
5638         /* Ensure this is an unlock - when canceling a lock, the
5639          * canceled lock is passed in, and it won't be an unlock.
5640          */
5641         fl->fl_type = F_UNLCK;
5642
5643         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5644         if (data == NULL) {
5645                 nfs_free_seqid(seqid);
5646                 return ERR_PTR(-ENOMEM);
5647         }
5648
5649         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5650         msg.rpc_argp = &data->arg;
5651         msg.rpc_resp = &data->res;
5652         task_setup_data.callback_data = data;
5653         return rpc_run_task(&task_setup_data);
5654 }
5655
5656 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5657 {
5658         struct inode *inode = state->inode;
5659         struct nfs4_state_owner *sp = state->owner;
5660         struct nfs_inode *nfsi = NFS_I(inode);
5661         struct nfs_seqid *seqid;
5662         struct nfs4_lock_state *lsp;
5663         struct rpc_task *task;
5664         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5665         int status = 0;
5666         unsigned char fl_flags = request->fl_flags;
5667
5668         status = nfs4_set_lock_state(state, request);
5669         /* Unlock _before_ we do the RPC call */
5670         request->fl_flags |= FL_EXISTS;
5671         /* Exclude nfs_delegation_claim_locks() */
5672         mutex_lock(&sp->so_delegreturn_mutex);
5673         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5674         down_read(&nfsi->rwsem);
5675         if (do_vfs_lock(inode, request) == -ENOENT) {
5676                 up_read(&nfsi->rwsem);
5677                 mutex_unlock(&sp->so_delegreturn_mutex);
5678                 goto out;
5679         }
5680         up_read(&nfsi->rwsem);
5681         mutex_unlock(&sp->so_delegreturn_mutex);
5682         if (status != 0)
5683                 goto out;
5684         /* Is this a delegated lock? */
5685         lsp = request->fl_u.nfs4_fl.owner;
5686         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5687                 goto out;
5688         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5689         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5690         status = -ENOMEM;
5691         if (IS_ERR(seqid))
5692                 goto out;
5693         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5694         status = PTR_ERR(task);
5695         if (IS_ERR(task))
5696                 goto out;
5697         status = nfs4_wait_for_completion_rpc_task(task);
5698         rpc_put_task(task);
5699 out:
5700         request->fl_flags = fl_flags;
5701         trace_nfs4_unlock(request, state, F_SETLK, status);
5702         return status;
5703 }
5704
5705 struct nfs4_lockdata {
5706         struct nfs_lock_args arg;
5707         struct nfs_lock_res res;
5708         struct nfs4_lock_state *lsp;
5709         struct nfs_open_context *ctx;
5710         struct file_lock fl;
5711         unsigned long timestamp;
5712         int rpc_status;
5713         int cancelled;
5714         struct nfs_server *server;
5715 };
5716
5717 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5718                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5719                 gfp_t gfp_mask)
5720 {
5721         struct nfs4_lockdata *p;
5722         struct inode *inode = lsp->ls_state->inode;
5723         struct nfs_server *server = NFS_SERVER(inode);
5724         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5725
5726         p = kzalloc(sizeof(*p), gfp_mask);
5727         if (p == NULL)
5728                 return NULL;
5729
5730         p->arg.fh = NFS_FH(inode);
5731         p->arg.fl = &p->fl;
5732         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5733         if (IS_ERR(p->arg.open_seqid))
5734                 goto out_free;
5735         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
5736         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5737         if (IS_ERR(p->arg.lock_seqid))
5738                 goto out_free_seqid;
5739         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5740         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5741         p->arg.lock_owner.s_dev = server->s_dev;
5742         p->res.lock_seqid = p->arg.lock_seqid;
5743         p->lsp = lsp;
5744         p->server = server;
5745         atomic_inc(&lsp->ls_count);
5746         p->ctx = get_nfs_open_context(ctx);
5747         get_file(fl->fl_file);
5748         memcpy(&p->fl, fl, sizeof(p->fl));
5749         return p;
5750 out_free_seqid:
5751         nfs_free_seqid(p->arg.open_seqid);
5752 out_free:
5753         kfree(p);
5754         return NULL;
5755 }
5756
5757 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5758 {
5759         struct nfs4_lockdata *data = calldata;
5760         struct nfs4_state *state = data->lsp->ls_state;
5761
5762         dprintk("%s: begin!\n", __func__);
5763         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5764                 goto out_wait;
5765         /* Do we need to do an open_to_lock_owner? */
5766         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5767                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5768                         goto out_release_lock_seqid;
5769                 }
5770                 nfs4_stateid_copy(&data->arg.open_stateid,
5771                                 &state->open_stateid);
5772                 data->arg.new_lock_owner = 1;
5773                 data->res.open_seqid = data->arg.open_seqid;
5774         } else {
5775                 data->arg.new_lock_owner = 0;
5776                 nfs4_stateid_copy(&data->arg.lock_stateid,
5777                                 &data->lsp->ls_stateid);
5778         }
5779         if (!nfs4_valid_open_stateid(state)) {
5780                 data->rpc_status = -EBADF;
5781                 task->tk_action = NULL;
5782                 goto out_release_open_seqid;
5783         }
5784         data->timestamp = jiffies;
5785         if (nfs4_setup_sequence(data->server,
5786                                 &data->arg.seq_args,
5787                                 &data->res.seq_res,
5788                                 task) == 0)
5789                 return;
5790 out_release_open_seqid:
5791         nfs_release_seqid(data->arg.open_seqid);
5792 out_release_lock_seqid:
5793         nfs_release_seqid(data->arg.lock_seqid);
5794 out_wait:
5795         nfs4_sequence_done(task, &data->res.seq_res);
5796         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5797 }
5798
5799 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5800 {
5801         struct nfs4_lockdata *data = calldata;
5802         struct nfs4_lock_state *lsp = data->lsp;
5803
5804         dprintk("%s: begin!\n", __func__);
5805
5806         if (!nfs4_sequence_done(task, &data->res.seq_res))
5807                 return;
5808
5809         data->rpc_status = task->tk_status;
5810         switch (task->tk_status) {
5811         case 0:
5812                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
5813                                 data->timestamp);
5814                 if (data->arg.new_lock) {
5815                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5816                         if (do_vfs_lock(lsp->ls_state->inode, &data->fl) < 0) {
5817                                 rpc_restart_call_prepare(task);
5818                                 break;
5819                         }
5820                 }
5821                 if (data->arg.new_lock_owner != 0) {
5822                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
5823                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5824                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5825                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5826                         rpc_restart_call_prepare(task);
5827                 break;
5828         case -NFS4ERR_BAD_STATEID:
5829         case -NFS4ERR_OLD_STATEID:
5830         case -NFS4ERR_STALE_STATEID:
5831         case -NFS4ERR_EXPIRED:
5832                 if (data->arg.new_lock_owner != 0) {
5833                         if (!nfs4_stateid_match(&data->arg.open_stateid,
5834                                                 &lsp->ls_state->open_stateid))
5835                                 rpc_restart_call_prepare(task);
5836                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5837                                                 &lsp->ls_stateid))
5838                                 rpc_restart_call_prepare(task);
5839         }
5840         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5841 }
5842
5843 static void nfs4_lock_release(void *calldata)
5844 {
5845         struct nfs4_lockdata *data = calldata;
5846
5847         dprintk("%s: begin!\n", __func__);
5848         nfs_free_seqid(data->arg.open_seqid);
5849         if (data->cancelled != 0) {
5850                 struct rpc_task *task;
5851                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5852                                 data->arg.lock_seqid);
5853                 if (!IS_ERR(task))
5854                         rpc_put_task_async(task);
5855                 dprintk("%s: cancelling lock!\n", __func__);
5856         } else
5857                 nfs_free_seqid(data->arg.lock_seqid);
5858         nfs4_put_lock_state(data->lsp);
5859         put_nfs_open_context(data->ctx);
5860         fput(data->fl.fl_file);
5861         kfree(data);
5862         dprintk("%s: done!\n", __func__);
5863 }
5864
5865 static const struct rpc_call_ops nfs4_lock_ops = {
5866         .rpc_call_prepare = nfs4_lock_prepare,
5867         .rpc_call_done = nfs4_lock_done,
5868         .rpc_release = nfs4_lock_release,
5869 };
5870
5871 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5872 {
5873         switch (error) {
5874         case -NFS4ERR_ADMIN_REVOKED:
5875         case -NFS4ERR_BAD_STATEID:
5876                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5877                 if (new_lock_owner != 0 ||
5878                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5879                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5880                 break;
5881         case -NFS4ERR_STALE_STATEID:
5882                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5883         case -NFS4ERR_EXPIRED:
5884                 nfs4_schedule_lease_recovery(server->nfs_client);
5885         };
5886 }
5887
5888 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5889 {
5890         struct nfs4_lockdata *data;
5891         struct rpc_task *task;
5892         struct rpc_message msg = {
5893                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5894                 .rpc_cred = state->owner->so_cred,
5895         };
5896         struct rpc_task_setup task_setup_data = {
5897                 .rpc_client = NFS_CLIENT(state->inode),
5898                 .rpc_message = &msg,
5899                 .callback_ops = &nfs4_lock_ops,
5900                 .workqueue = nfsiod_workqueue,
5901                 .flags = RPC_TASK_ASYNC,
5902         };
5903         int ret;
5904
5905         dprintk("%s: begin!\n", __func__);
5906         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5907                         fl->fl_u.nfs4_fl.owner,
5908                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5909         if (data == NULL)
5910                 return -ENOMEM;
5911         if (IS_SETLKW(cmd))
5912                 data->arg.block = 1;
5913         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5914         msg.rpc_argp = &data->arg;
5915         msg.rpc_resp = &data->res;
5916         task_setup_data.callback_data = data;
5917         if (recovery_type > NFS_LOCK_NEW) {
5918                 if (recovery_type == NFS_LOCK_RECLAIM)
5919                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5920                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5921         } else
5922                 data->arg.new_lock = 1;
5923         task = rpc_run_task(&task_setup_data);
5924         if (IS_ERR(task))
5925                 return PTR_ERR(task);
5926         ret = nfs4_wait_for_completion_rpc_task(task);
5927         if (ret == 0) {
5928                 ret = data->rpc_status;
5929                 if (ret)
5930                         nfs4_handle_setlk_error(data->server, data->lsp,
5931                                         data->arg.new_lock_owner, ret);
5932         } else
5933                 data->cancelled = 1;
5934         rpc_put_task(task);
5935         dprintk("%s: done, ret = %d!\n", __func__, ret);
5936         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
5937         return ret;
5938 }
5939
5940 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5941 {
5942         struct nfs_server *server = NFS_SERVER(state->inode);
5943         struct nfs4_exception exception = {
5944                 .inode = state->inode,
5945         };
5946         int err;
5947
5948         do {
5949                 /* Cache the lock if possible... */
5950                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5951                         return 0;
5952                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5953                 if (err != -NFS4ERR_DELAY)
5954                         break;
5955                 nfs4_handle_exception(server, err, &exception);
5956         } while (exception.retry);
5957         return err;
5958 }
5959
5960 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5961 {
5962         struct nfs_server *server = NFS_SERVER(state->inode);
5963         struct nfs4_exception exception = {
5964                 .inode = state->inode,
5965         };
5966         int err;
5967
5968         err = nfs4_set_lock_state(state, request);
5969         if (err != 0)
5970                 return err;
5971         if (!recover_lost_locks) {
5972                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5973                 return 0;
5974         }
5975         do {
5976                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5977                         return 0;
5978                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5979                 switch (err) {
5980                 default:
5981                         goto out;
5982                 case -NFS4ERR_GRACE:
5983                 case -NFS4ERR_DELAY:
5984                         nfs4_handle_exception(server, err, &exception);
5985                         err = 0;
5986                 }
5987         } while (exception.retry);
5988 out:
5989         return err;
5990 }
5991
5992 #if defined(CONFIG_NFS_V4_1)
5993 /**
5994  * nfs41_check_expired_locks - possibly free a lock stateid
5995  *
5996  * @state: NFSv4 state for an inode
5997  *
5998  * Returns NFS_OK if recovery for this stateid is now finished.
5999  * Otherwise a negative NFS4ERR value is returned.
6000  */
6001 static int nfs41_check_expired_locks(struct nfs4_state *state)
6002 {
6003         int status, ret = -NFS4ERR_BAD_STATEID;
6004         struct nfs4_lock_state *lsp;
6005         struct nfs_server *server = NFS_SERVER(state->inode);
6006
6007         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
6008                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
6009                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
6010
6011                         status = nfs41_test_stateid(server,
6012                                         &lsp->ls_stateid,
6013                                         cred);
6014                         trace_nfs4_test_lock_stateid(state, lsp, status);
6015                         if (status != NFS_OK) {
6016                                 /* Free the stateid unless the server
6017                                  * informs us the stateid is unrecognized. */
6018                                 if (status != -NFS4ERR_BAD_STATEID)
6019                                         nfs41_free_stateid(server,
6020                                                         &lsp->ls_stateid,
6021                                                         cred);
6022                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6023                                 ret = status;
6024                         }
6025                 }
6026         };
6027
6028         return ret;
6029 }
6030
6031 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
6032 {
6033         int status = NFS_OK;
6034
6035         if (test_bit(LK_STATE_IN_USE, &state->flags))
6036                 status = nfs41_check_expired_locks(state);
6037         if (status != NFS_OK)
6038                 status = nfs4_lock_expired(state, request);
6039         return status;
6040 }
6041 #endif
6042
6043 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6044 {
6045         struct nfs_inode *nfsi = NFS_I(state->inode);
6046         unsigned char fl_flags = request->fl_flags;
6047         int status = -ENOLCK;
6048
6049         if ((fl_flags & FL_POSIX) &&
6050                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
6051                 goto out;
6052         /* Is this a delegated open? */
6053         status = nfs4_set_lock_state(state, request);
6054         if (status != 0)
6055                 goto out;
6056         request->fl_flags |= FL_ACCESS;
6057         status = do_vfs_lock(state->inode, request);
6058         if (status < 0)
6059                 goto out;
6060         down_read(&nfsi->rwsem);
6061         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
6062                 /* Yes: cache locks! */
6063                 /* ...but avoid races with delegation recall... */
6064                 request->fl_flags = fl_flags & ~FL_SLEEP;
6065                 status = do_vfs_lock(state->inode, request);
6066                 up_read(&nfsi->rwsem);
6067                 goto out;
6068         }
6069         up_read(&nfsi->rwsem);
6070         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
6071 out:
6072         request->fl_flags = fl_flags;
6073         return status;
6074 }
6075
6076 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6077 {
6078         struct nfs4_exception exception = {
6079                 .state = state,
6080                 .inode = state->inode,
6081         };
6082         int err;
6083
6084         do {
6085                 err = _nfs4_proc_setlk(state, cmd, request);
6086                 if (err == -NFS4ERR_DENIED)
6087                         err = -EAGAIN;
6088                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
6089                                 err, &exception);
6090         } while (exception.retry);
6091         return err;
6092 }
6093
6094 static int
6095 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
6096 {
6097         struct nfs_open_context *ctx;
6098         struct nfs4_state *state;
6099         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
6100         int status;
6101
6102         /* verify open state */
6103         ctx = nfs_file_open_context(filp);
6104         state = ctx->state;
6105
6106         if (request->fl_start < 0 || request->fl_end < 0)
6107                 return -EINVAL;
6108
6109         if (IS_GETLK(cmd)) {
6110                 if (state != NULL)
6111                         return nfs4_proc_getlk(state, F_GETLK, request);
6112                 return 0;
6113         }
6114
6115         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
6116                 return -EINVAL;
6117
6118         if (request->fl_type == F_UNLCK) {
6119                 if (state != NULL)
6120                         return nfs4_proc_unlck(state, cmd, request);
6121                 return 0;
6122         }
6123
6124         if (state == NULL)
6125                 return -ENOLCK;
6126         /*
6127          * Don't rely on the VFS having checked the file open mode,
6128          * since it won't do this for flock() locks.
6129          */
6130         switch (request->fl_type) {
6131         case F_RDLCK:
6132                 if (!(filp->f_mode & FMODE_READ))
6133                         return -EBADF;
6134                 break;
6135         case F_WRLCK:
6136                 if (!(filp->f_mode & FMODE_WRITE))
6137                         return -EBADF;
6138         }
6139
6140         do {
6141                 status = nfs4_proc_setlk(state, cmd, request);
6142                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6143                         break;
6144                 timeout = nfs4_set_lock_task_retry(timeout);
6145                 status = -ERESTARTSYS;
6146                 if (signalled())
6147                         break;
6148         } while(status < 0);
6149         return status;
6150 }
6151
6152 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6153 {
6154         struct nfs_server *server = NFS_SERVER(state->inode);
6155         int err;
6156
6157         err = nfs4_set_lock_state(state, fl);
6158         if (err != 0)
6159                 return err;
6160         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6161         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6162 }
6163
6164 struct nfs_release_lockowner_data {
6165         struct nfs4_lock_state *lsp;
6166         struct nfs_server *server;
6167         struct nfs_release_lockowner_args args;
6168         struct nfs_release_lockowner_res res;
6169         unsigned long timestamp;
6170 };
6171
6172 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6173 {
6174         struct nfs_release_lockowner_data *data = calldata;
6175         struct nfs_server *server = data->server;
6176         nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6177                              &data->args.seq_args, &data->res.seq_res, task);
6178         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6179         data->timestamp = jiffies;
6180 }
6181
6182 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6183 {
6184         struct nfs_release_lockowner_data *data = calldata;
6185         struct nfs_server *server = data->server;
6186
6187         nfs40_sequence_done(task, &data->res.seq_res);
6188
6189         switch (task->tk_status) {
6190         case 0:
6191                 renew_lease(server, data->timestamp);
6192                 break;
6193         case -NFS4ERR_STALE_CLIENTID:
6194         case -NFS4ERR_EXPIRED:
6195                 nfs4_schedule_lease_recovery(server->nfs_client);
6196                 break;
6197         case -NFS4ERR_LEASE_MOVED:
6198         case -NFS4ERR_DELAY:
6199                 if (nfs4_async_handle_error(task, server,
6200                                             NULL, NULL) == -EAGAIN)
6201                         rpc_restart_call_prepare(task);
6202         }
6203 }
6204
6205 static void nfs4_release_lockowner_release(void *calldata)
6206 {
6207         struct nfs_release_lockowner_data *data = calldata;
6208         nfs4_free_lock_state(data->server, data->lsp);
6209         kfree(calldata);
6210 }
6211
6212 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6213         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6214         .rpc_call_done = nfs4_release_lockowner_done,
6215         .rpc_release = nfs4_release_lockowner_release,
6216 };
6217
6218 static void
6219 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6220 {
6221         struct nfs_release_lockowner_data *data;
6222         struct rpc_message msg = {
6223                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6224         };
6225
6226         if (server->nfs_client->cl_mvops->minor_version != 0)
6227                 return;
6228
6229         data = kmalloc(sizeof(*data), GFP_NOFS);
6230         if (!data)
6231                 return;
6232         data->lsp = lsp;
6233         data->server = server;
6234         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6235         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6236         data->args.lock_owner.s_dev = server->s_dev;
6237
6238         msg.rpc_argp = &data->args;
6239         msg.rpc_resp = &data->res;
6240         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6241         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6242 }
6243
6244 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6245
6246 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
6247                                    struct dentry *dentry, const char *key,
6248                                    const void *buf, size_t buflen,
6249                                    int flags)
6250 {
6251         return nfs4_proc_set_acl(d_inode(dentry), buf, buflen);
6252 }
6253
6254 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
6255                                    struct dentry *dentry, const char *key,
6256                                    void *buf, size_t buflen)
6257 {
6258         return nfs4_proc_get_acl(d_inode(dentry), buf, buflen);
6259 }
6260
6261 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
6262 {
6263         return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
6264 }
6265
6266 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6267
6268 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
6269                                      struct dentry *dentry, const char *key,
6270                                      const void *buf, size_t buflen,
6271                                      int flags)
6272 {
6273         if (security_ismaclabel(key))
6274                 return nfs4_set_security_label(dentry, buf, buflen);
6275
6276         return -EOPNOTSUPP;
6277 }
6278
6279 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
6280                                      struct dentry *dentry, const char *key,
6281                                      void *buf, size_t buflen)
6282 {
6283         if (security_ismaclabel(key))
6284                 return nfs4_get_security_label(d_inode(dentry), buf, buflen);
6285         return -EOPNOTSUPP;
6286 }
6287
6288 static ssize_t
6289 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6290 {
6291         int len = 0;
6292
6293         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
6294                 len = security_inode_listsecurity(inode, list, list_len);
6295                 if (list_len && len > list_len)
6296                         return -ERANGE;
6297         }
6298         return len;
6299 }
6300
6301 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6302         .prefix = XATTR_SECURITY_PREFIX,
6303         .get    = nfs4_xattr_get_nfs4_label,
6304         .set    = nfs4_xattr_set_nfs4_label,
6305 };
6306
6307 #else
6308
6309 static ssize_t
6310 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6311 {
6312         return 0;
6313 }
6314
6315 #endif
6316
6317 /*
6318  * nfs_fhget will use either the mounted_on_fileid or the fileid
6319  */
6320 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6321 {
6322         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6323                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6324               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6325               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6326                 return;
6327
6328         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6329                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6330         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6331         fattr->nlink = 2;
6332 }
6333
6334 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6335                                    const struct qstr *name,
6336                                    struct nfs4_fs_locations *fs_locations,
6337                                    struct page *page)
6338 {
6339         struct nfs_server *server = NFS_SERVER(dir);
6340         u32 bitmask[3] = {
6341                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6342         };
6343         struct nfs4_fs_locations_arg args = {
6344                 .dir_fh = NFS_FH(dir),
6345                 .name = name,
6346                 .page = page,
6347                 .bitmask = bitmask,
6348         };
6349         struct nfs4_fs_locations_res res = {
6350                 .fs_locations = fs_locations,
6351         };
6352         struct rpc_message msg = {
6353                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6354                 .rpc_argp = &args,
6355                 .rpc_resp = &res,
6356         };
6357         int status;
6358
6359         dprintk("%s: start\n", __func__);
6360
6361         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6362          * is not supported */
6363         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6364                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6365         else
6366                 bitmask[0] |= FATTR4_WORD0_FILEID;
6367
6368         nfs_fattr_init(&fs_locations->fattr);
6369         fs_locations->server = server;
6370         fs_locations->nlocations = 0;
6371         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6372         dprintk("%s: returned status = %d\n", __func__, status);
6373         return status;
6374 }
6375
6376 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6377                            const struct qstr *name,
6378                            struct nfs4_fs_locations *fs_locations,
6379                            struct page *page)
6380 {
6381         struct nfs4_exception exception = { };
6382         int err;
6383         do {
6384                 err = _nfs4_proc_fs_locations(client, dir, name,
6385                                 fs_locations, page);
6386                 trace_nfs4_get_fs_locations(dir, name, err);
6387                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6388                                 &exception);
6389         } while (exception.retry);
6390         return err;
6391 }
6392
6393 /*
6394  * This operation also signals the server that this client is
6395  * performing migration recovery.  The server can stop returning
6396  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6397  * appended to this compound to identify the client ID which is
6398  * performing recovery.
6399  */
6400 static int _nfs40_proc_get_locations(struct inode *inode,
6401                                      struct nfs4_fs_locations *locations,
6402                                      struct page *page, struct rpc_cred *cred)
6403 {
6404         struct nfs_server *server = NFS_SERVER(inode);
6405         struct rpc_clnt *clnt = server->client;
6406         u32 bitmask[2] = {
6407                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6408         };
6409         struct nfs4_fs_locations_arg args = {
6410                 .clientid       = server->nfs_client->cl_clientid,
6411                 .fh             = NFS_FH(inode),
6412                 .page           = page,
6413                 .bitmask        = bitmask,
6414                 .migration      = 1,            /* skip LOOKUP */
6415                 .renew          = 1,            /* append RENEW */
6416         };
6417         struct nfs4_fs_locations_res res = {
6418                 .fs_locations   = locations,
6419                 .migration      = 1,
6420                 .renew          = 1,
6421         };
6422         struct rpc_message msg = {
6423                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6424                 .rpc_argp       = &args,
6425                 .rpc_resp       = &res,
6426                 .rpc_cred       = cred,
6427         };
6428         unsigned long now = jiffies;
6429         int status;
6430
6431         nfs_fattr_init(&locations->fattr);
6432         locations->server = server;
6433         locations->nlocations = 0;
6434
6435         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6436         nfs4_set_sequence_privileged(&args.seq_args);
6437         status = nfs4_call_sync_sequence(clnt, server, &msg,
6438                                         &args.seq_args, &res.seq_res);
6439         if (status)
6440                 return status;
6441
6442         renew_lease(server, now);
6443         return 0;
6444 }
6445
6446 #ifdef CONFIG_NFS_V4_1
6447
6448 /*
6449  * This operation also signals the server that this client is
6450  * performing migration recovery.  The server can stop asserting
6451  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6452  * performing this operation is identified in the SEQUENCE
6453  * operation in this compound.
6454  *
6455  * When the client supports GETATTR(fs_locations_info), it can
6456  * be plumbed in here.
6457  */
6458 static int _nfs41_proc_get_locations(struct inode *inode,
6459                                      struct nfs4_fs_locations *locations,
6460                                      struct page *page, struct rpc_cred *cred)
6461 {
6462         struct nfs_server *server = NFS_SERVER(inode);
6463         struct rpc_clnt *clnt = server->client;
6464         u32 bitmask[2] = {
6465                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6466         };
6467         struct nfs4_fs_locations_arg args = {
6468                 .fh             = NFS_FH(inode),
6469                 .page           = page,
6470                 .bitmask        = bitmask,
6471                 .migration      = 1,            /* skip LOOKUP */
6472         };
6473         struct nfs4_fs_locations_res res = {
6474                 .fs_locations   = locations,
6475                 .migration      = 1,
6476         };
6477         struct rpc_message msg = {
6478                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6479                 .rpc_argp       = &args,
6480                 .rpc_resp       = &res,
6481                 .rpc_cred       = cred,
6482         };
6483         int status;
6484
6485         nfs_fattr_init(&locations->fattr);
6486         locations->server = server;
6487         locations->nlocations = 0;
6488
6489         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6490         nfs4_set_sequence_privileged(&args.seq_args);
6491         status = nfs4_call_sync_sequence(clnt, server, &msg,
6492                                         &args.seq_args, &res.seq_res);
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_get_locations - discover locations for a migrated FSID
6503  * @inode: inode on FSID that is migrating
6504  * @locations: result of query
6505  * @page: buffer
6506  * @cred: credential to use for this operation
6507  *
6508  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6509  * operation failed, or a negative errno if a local error occurred.
6510  *
6511  * On success, "locations" is filled in, but if the server has
6512  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6513  * asserted.
6514  *
6515  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6516  * from this client that require migration recovery.
6517  */
6518 int nfs4_proc_get_locations(struct inode *inode,
6519                             struct nfs4_fs_locations *locations,
6520                             struct page *page, struct rpc_cred *cred)
6521 {
6522         struct nfs_server *server = NFS_SERVER(inode);
6523         struct nfs_client *clp = server->nfs_client;
6524         const struct nfs4_mig_recovery_ops *ops =
6525                                         clp->cl_mvops->mig_recovery_ops;
6526         struct nfs4_exception exception = { };
6527         int status;
6528
6529         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6530                 (unsigned long long)server->fsid.major,
6531                 (unsigned long long)server->fsid.minor,
6532                 clp->cl_hostname);
6533         nfs_display_fhandle(NFS_FH(inode), __func__);
6534
6535         do {
6536                 status = ops->get_locations(inode, locations, page, cred);
6537                 if (status != -NFS4ERR_DELAY)
6538                         break;
6539                 nfs4_handle_exception(server, status, &exception);
6540         } while (exception.retry);
6541         return status;
6542 }
6543
6544 /*
6545  * This operation also signals the server that this client is
6546  * performing "lease moved" recovery.  The server can stop
6547  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6548  * is appended to this compound to identify the client ID which is
6549  * performing recovery.
6550  */
6551 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6552 {
6553         struct nfs_server *server = NFS_SERVER(inode);
6554         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6555         struct rpc_clnt *clnt = server->client;
6556         struct nfs4_fsid_present_arg args = {
6557                 .fh             = NFS_FH(inode),
6558                 .clientid       = clp->cl_clientid,
6559                 .renew          = 1,            /* append RENEW */
6560         };
6561         struct nfs4_fsid_present_res res = {
6562                 .renew          = 1,
6563         };
6564         struct rpc_message msg = {
6565                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6566                 .rpc_argp       = &args,
6567                 .rpc_resp       = &res,
6568                 .rpc_cred       = cred,
6569         };
6570         unsigned long now = jiffies;
6571         int status;
6572
6573         res.fh = nfs_alloc_fhandle();
6574         if (res.fh == NULL)
6575                 return -ENOMEM;
6576
6577         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6578         nfs4_set_sequence_privileged(&args.seq_args);
6579         status = nfs4_call_sync_sequence(clnt, server, &msg,
6580                                                 &args.seq_args, &res.seq_res);
6581         nfs_free_fhandle(res.fh);
6582         if (status)
6583                 return status;
6584
6585         do_renew_lease(clp, now);
6586         return 0;
6587 }
6588
6589 #ifdef CONFIG_NFS_V4_1
6590
6591 /*
6592  * This operation also signals the server that this client is
6593  * performing "lease moved" recovery.  The server can stop asserting
6594  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6595  * this operation is identified in the SEQUENCE operation in this
6596  * compound.
6597  */
6598 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6599 {
6600         struct nfs_server *server = NFS_SERVER(inode);
6601         struct rpc_clnt *clnt = server->client;
6602         struct nfs4_fsid_present_arg args = {
6603                 .fh             = NFS_FH(inode),
6604         };
6605         struct nfs4_fsid_present_res res = {
6606         };
6607         struct rpc_message msg = {
6608                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6609                 .rpc_argp       = &args,
6610                 .rpc_resp       = &res,
6611                 .rpc_cred       = cred,
6612         };
6613         int status;
6614
6615         res.fh = nfs_alloc_fhandle();
6616         if (res.fh == NULL)
6617                 return -ENOMEM;
6618
6619         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6620         nfs4_set_sequence_privileged(&args.seq_args);
6621         status = nfs4_call_sync_sequence(clnt, server, &msg,
6622                                                 &args.seq_args, &res.seq_res);
6623         nfs_free_fhandle(res.fh);
6624         if (status == NFS4_OK &&
6625             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6626                 status = -NFS4ERR_LEASE_MOVED;
6627         return status;
6628 }
6629
6630 #endif  /* CONFIG_NFS_V4_1 */
6631
6632 /**
6633  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6634  * @inode: inode on FSID to check
6635  * @cred: credential to use for this operation
6636  *
6637  * Server indicates whether the FSID is present, moved, or not
6638  * recognized.  This operation is necessary to clear a LEASE_MOVED
6639  * condition for this client ID.
6640  *
6641  * Returns NFS4_OK if the FSID is present on this server,
6642  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6643  *  NFS4ERR code if some error occurred on the server, or a
6644  *  negative errno if a local failure occurred.
6645  */
6646 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6647 {
6648         struct nfs_server *server = NFS_SERVER(inode);
6649         struct nfs_client *clp = server->nfs_client;
6650         const struct nfs4_mig_recovery_ops *ops =
6651                                         clp->cl_mvops->mig_recovery_ops;
6652         struct nfs4_exception exception = { };
6653         int status;
6654
6655         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6656                 (unsigned long long)server->fsid.major,
6657                 (unsigned long long)server->fsid.minor,
6658                 clp->cl_hostname);
6659         nfs_display_fhandle(NFS_FH(inode), __func__);
6660
6661         do {
6662                 status = ops->fsid_present(inode, cred);
6663                 if (status != -NFS4ERR_DELAY)
6664                         break;
6665                 nfs4_handle_exception(server, status, &exception);
6666         } while (exception.retry);
6667         return status;
6668 }
6669
6670 /**
6671  * If 'use_integrity' is true and the state managment nfs_client
6672  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6673  * and the machine credential as per RFC3530bis and RFC5661 Security
6674  * Considerations sections. Otherwise, just use the user cred with the
6675  * filesystem's rpc_client.
6676  */
6677 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6678 {
6679         int status;
6680         struct nfs4_secinfo_arg args = {
6681                 .dir_fh = NFS_FH(dir),
6682                 .name   = name,
6683         };
6684         struct nfs4_secinfo_res res = {
6685                 .flavors     = flavors,
6686         };
6687         struct rpc_message msg = {
6688                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6689                 .rpc_argp = &args,
6690                 .rpc_resp = &res,
6691         };
6692         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6693         struct rpc_cred *cred = NULL;
6694
6695         if (use_integrity) {
6696                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6697                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6698                 msg.rpc_cred = cred;
6699         }
6700
6701         dprintk("NFS call  secinfo %s\n", name->name);
6702
6703         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6704                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6705
6706         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6707                                 &res.seq_res, 0);
6708         dprintk("NFS reply  secinfo: %d\n", status);
6709
6710         if (cred)
6711                 put_rpccred(cred);
6712
6713         return status;
6714 }
6715
6716 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6717                       struct nfs4_secinfo_flavors *flavors)
6718 {
6719         struct nfs4_exception exception = { };
6720         int err;
6721         do {
6722                 err = -NFS4ERR_WRONGSEC;
6723
6724                 /* try to use integrity protection with machine cred */
6725                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6726                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6727
6728                 /*
6729                  * if unable to use integrity protection, or SECINFO with
6730                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6731                  * disallowed by spec, but exists in deployed servers) use
6732                  * the current filesystem's rpc_client and the user cred.
6733                  */
6734                 if (err == -NFS4ERR_WRONGSEC)
6735                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6736
6737                 trace_nfs4_secinfo(dir, name, err);
6738                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6739                                 &exception);
6740         } while (exception.retry);
6741         return err;
6742 }
6743
6744 #ifdef CONFIG_NFS_V4_1
6745 /*
6746  * Check the exchange flags returned by the server for invalid flags, having
6747  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6748  * DS flags set.
6749  */
6750 static int nfs4_check_cl_exchange_flags(u32 flags)
6751 {
6752         if (flags & ~EXCHGID4_FLAG_MASK_R)
6753                 goto out_inval;
6754         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6755             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6756                 goto out_inval;
6757         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6758                 goto out_inval;
6759         return NFS_OK;
6760 out_inval:
6761         return -NFS4ERR_INVAL;
6762 }
6763
6764 static bool
6765 nfs41_same_server_scope(struct nfs41_server_scope *a,
6766                         struct nfs41_server_scope *b)
6767 {
6768         if (a->server_scope_sz == b->server_scope_sz &&
6769             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6770                 return true;
6771
6772         return false;
6773 }
6774
6775 /*
6776  * nfs4_proc_bind_conn_to_session()
6777  *
6778  * The 4.1 client currently uses the same TCP connection for the
6779  * fore and backchannel.
6780  */
6781 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6782 {
6783         int status;
6784         struct nfs41_bind_conn_to_session_args args = {
6785                 .client = clp,
6786                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
6787         };
6788         struct nfs41_bind_conn_to_session_res res;
6789         struct rpc_message msg = {
6790                 .rpc_proc =
6791                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6792                 .rpc_argp = &args,
6793                 .rpc_resp = &res,
6794                 .rpc_cred = cred,
6795         };
6796
6797         dprintk("--> %s\n", __func__);
6798
6799         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
6800         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
6801                 args.dir = NFS4_CDFC4_FORE;
6802
6803         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6804         trace_nfs4_bind_conn_to_session(clp, status);
6805         if (status == 0) {
6806                 if (memcmp(res.sessionid.data,
6807                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6808                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6809                         status = -EIO;
6810                         goto out;
6811                 }
6812                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
6813                         dprintk("NFS: %s: Unexpected direction from server\n",
6814                                 __func__);
6815                         status = -EIO;
6816                         goto out;
6817                 }
6818                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
6819                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6820                                 __func__);
6821                         status = -EIO;
6822                         goto out;
6823                 }
6824         }
6825 out:
6826         dprintk("<-- %s status= %d\n", __func__, status);
6827         return status;
6828 }
6829
6830 /*
6831  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6832  * and operations we'd like to see to enable certain features in the allow map
6833  */
6834 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6835         .how = SP4_MACH_CRED,
6836         .enforce.u.words = {
6837                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6838                       1 << (OP_EXCHANGE_ID - 32) |
6839                       1 << (OP_CREATE_SESSION - 32) |
6840                       1 << (OP_DESTROY_SESSION - 32) |
6841                       1 << (OP_DESTROY_CLIENTID - 32)
6842         },
6843         .allow.u.words = {
6844                 [0] = 1 << (OP_CLOSE) |
6845                       1 << (OP_OPEN_DOWNGRADE) |
6846                       1 << (OP_LOCKU) |
6847                       1 << (OP_DELEGRETURN) |
6848                       1 << (OP_COMMIT),
6849                 [1] = 1 << (OP_SECINFO - 32) |
6850                       1 << (OP_SECINFO_NO_NAME - 32) |
6851                       1 << (OP_LAYOUTRETURN - 32) |
6852                       1 << (OP_TEST_STATEID - 32) |
6853                       1 << (OP_FREE_STATEID - 32) |
6854                       1 << (OP_WRITE - 32)
6855         }
6856 };
6857
6858 /*
6859  * Select the state protection mode for client `clp' given the server results
6860  * from exchange_id in `sp'.
6861  *
6862  * Returns 0 on success, negative errno otherwise.
6863  */
6864 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6865                                  struct nfs41_state_protection *sp)
6866 {
6867         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6868                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6869                       1 << (OP_EXCHANGE_ID - 32) |
6870                       1 << (OP_CREATE_SESSION - 32) |
6871                       1 << (OP_DESTROY_SESSION - 32) |
6872                       1 << (OP_DESTROY_CLIENTID - 32)
6873         };
6874         unsigned int i;
6875
6876         if (sp->how == SP4_MACH_CRED) {
6877                 /* Print state protect result */
6878                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6879                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6880                         if (test_bit(i, sp->enforce.u.longs))
6881                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6882                         if (test_bit(i, sp->allow.u.longs))
6883                                 dfprintk(MOUNT, "  allow op %d\n", i);
6884                 }
6885
6886                 /* make sure nothing is on enforce list that isn't supported */
6887                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6888                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6889                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6890                                 return -EINVAL;
6891                         }
6892                 }
6893
6894                 /*
6895                  * Minimal mode - state operations are allowed to use machine
6896                  * credential.  Note this already happens by default, so the
6897                  * client doesn't have to do anything more than the negotiation.
6898                  *
6899                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6900                  *       we're already using the machine cred for exchange_id
6901                  *       and will never use a different cred.
6902                  */
6903                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6904                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6905                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6906                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6907                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6908                         dfprintk(MOUNT, "  minimal mode enabled\n");
6909                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6910                 } else {
6911                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6912                         return -EINVAL;
6913                 }
6914
6915                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6916                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
6917                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
6918                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6919                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6920                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6921                 }
6922
6923                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
6924                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
6925                         set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP,
6926                                 &clp->cl_sp4_flags);
6927                 }
6928
6929                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6930                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6931                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6932                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6933                 }
6934
6935                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6936                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6937                         dfprintk(MOUNT, "  stateid mode enabled\n");
6938                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6939                 }
6940
6941                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6942                         dfprintk(MOUNT, "  write mode enabled\n");
6943                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6944                 }
6945
6946                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6947                         dfprintk(MOUNT, "  commit mode enabled\n");
6948                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6949                 }
6950         }
6951
6952         return 0;
6953 }
6954
6955 /*
6956  * _nfs4_proc_exchange_id()
6957  *
6958  * Wrapper for EXCHANGE_ID operation.
6959  */
6960 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6961         u32 sp4_how)
6962 {
6963         nfs4_verifier verifier;
6964         struct nfs41_exchange_id_args args = {
6965                 .verifier = &verifier,
6966                 .client = clp,
6967 #ifdef CONFIG_NFS_V4_1_MIGRATION
6968                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6969                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6970                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6971 #else
6972                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6973                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6974 #endif
6975         };
6976         struct nfs41_exchange_id_res res = {
6977                 0
6978         };
6979         int status;
6980         struct rpc_message msg = {
6981                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6982                 .rpc_argp = &args,
6983                 .rpc_resp = &res,
6984                 .rpc_cred = cred,
6985         };
6986
6987         nfs4_init_boot_verifier(clp, &verifier);
6988
6989         status = nfs4_init_uniform_client_string(clp);
6990         if (status)
6991                 goto out;
6992
6993         dprintk("NFS call  exchange_id auth=%s, '%s'\n",
6994                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6995                 clp->cl_owner_id);
6996
6997         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6998                                         GFP_NOFS);
6999         if (unlikely(res.server_owner == NULL)) {
7000                 status = -ENOMEM;
7001                 goto out;
7002         }
7003
7004         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
7005                                         GFP_NOFS);
7006         if (unlikely(res.server_scope == NULL)) {
7007                 status = -ENOMEM;
7008                 goto out_server_owner;
7009         }
7010
7011         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
7012         if (unlikely(res.impl_id == NULL)) {
7013                 status = -ENOMEM;
7014                 goto out_server_scope;
7015         }
7016
7017         switch (sp4_how) {
7018         case SP4_NONE:
7019                 args.state_protect.how = SP4_NONE;
7020                 break;
7021
7022         case SP4_MACH_CRED:
7023                 args.state_protect = nfs4_sp4_mach_cred_request;
7024                 break;
7025
7026         default:
7027                 /* unsupported! */
7028                 WARN_ON_ONCE(1);
7029                 status = -EINVAL;
7030                 goto out_impl_id;
7031         }
7032
7033         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7034         trace_nfs4_exchange_id(clp, status);
7035         if (status == 0)
7036                 status = nfs4_check_cl_exchange_flags(res.flags);
7037
7038         if (status == 0)
7039                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
7040
7041         if (status == 0) {
7042                 clp->cl_clientid = res.clientid;
7043                 clp->cl_exchange_flags = res.flags;
7044                 /* Client ID is not confirmed */
7045                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
7046                         clear_bit(NFS4_SESSION_ESTABLISHED,
7047                                         &clp->cl_session->session_state);
7048                         clp->cl_seqid = res.seqid;
7049                 }
7050
7051                 kfree(clp->cl_serverowner);
7052                 clp->cl_serverowner = res.server_owner;
7053                 res.server_owner = NULL;
7054
7055                 /* use the most recent implementation id */
7056                 kfree(clp->cl_implid);
7057                 clp->cl_implid = res.impl_id;
7058                 res.impl_id = NULL;
7059
7060                 if (clp->cl_serverscope != NULL &&
7061                     !nfs41_same_server_scope(clp->cl_serverscope,
7062                                              res.server_scope)) {
7063                         dprintk("%s: server_scope mismatch detected\n",
7064                                 __func__);
7065                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
7066                         kfree(clp->cl_serverscope);
7067                         clp->cl_serverscope = NULL;
7068                 }
7069
7070                 if (clp->cl_serverscope == NULL) {
7071                         clp->cl_serverscope = res.server_scope;
7072                         res.server_scope = NULL;
7073                 }
7074         }
7075
7076 out_impl_id:
7077         kfree(res.impl_id);
7078 out_server_scope:
7079         kfree(res.server_scope);
7080 out_server_owner:
7081         kfree(res.server_owner);
7082 out:
7083         if (clp->cl_implid != NULL)
7084                 dprintk("NFS reply exchange_id: Server Implementation ID: "
7085                         "domain: %s, name: %s, date: %llu,%u\n",
7086                         clp->cl_implid->domain, clp->cl_implid->name,
7087                         clp->cl_implid->date.seconds,
7088                         clp->cl_implid->date.nseconds);
7089         dprintk("NFS reply exchange_id: %d\n", status);
7090         return status;
7091 }
7092
7093 /*
7094  * nfs4_proc_exchange_id()
7095  *
7096  * Returns zero, a negative errno, or a negative NFS4ERR status code.
7097  *
7098  * Since the clientid has expired, all compounds using sessions
7099  * associated with the stale clientid will be returning
7100  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
7101  * be in some phase of session reset.
7102  *
7103  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
7104  */
7105 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
7106 {
7107         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
7108         int status;
7109
7110         /* try SP4_MACH_CRED if krb5i/p */
7111         if (authflavor == RPC_AUTH_GSS_KRB5I ||
7112             authflavor == RPC_AUTH_GSS_KRB5P) {
7113                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
7114                 if (!status)
7115                         return 0;
7116         }
7117
7118         /* try SP4_NONE */
7119         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
7120 }
7121
7122 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
7123                 struct rpc_cred *cred)
7124 {
7125         struct rpc_message msg = {
7126                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
7127                 .rpc_argp = clp,
7128                 .rpc_cred = cred,
7129         };
7130         int status;
7131
7132         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7133         trace_nfs4_destroy_clientid(clp, status);
7134         if (status)
7135                 dprintk("NFS: Got error %d from the server %s on "
7136                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
7137         return status;
7138 }
7139
7140 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
7141                 struct rpc_cred *cred)
7142 {
7143         unsigned int loop;
7144         int ret;
7145
7146         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
7147                 ret = _nfs4_proc_destroy_clientid(clp, cred);
7148                 switch (ret) {
7149                 case -NFS4ERR_DELAY:
7150                 case -NFS4ERR_CLIENTID_BUSY:
7151                         ssleep(1);
7152                         break;
7153                 default:
7154                         return ret;
7155                 }
7156         }
7157         return 0;
7158 }
7159
7160 int nfs4_destroy_clientid(struct nfs_client *clp)
7161 {
7162         struct rpc_cred *cred;
7163         int ret = 0;
7164
7165         if (clp->cl_mvops->minor_version < 1)
7166                 goto out;
7167         if (clp->cl_exchange_flags == 0)
7168                 goto out;
7169         if (clp->cl_preserve_clid)
7170                 goto out;
7171         cred = nfs4_get_clid_cred(clp);
7172         ret = nfs4_proc_destroy_clientid(clp, cred);
7173         if (cred)
7174                 put_rpccred(cred);
7175         switch (ret) {
7176         case 0:
7177         case -NFS4ERR_STALE_CLIENTID:
7178                 clp->cl_exchange_flags = 0;
7179         }
7180 out:
7181         return ret;
7182 }
7183
7184 struct nfs4_get_lease_time_data {
7185         struct nfs4_get_lease_time_args *args;
7186         struct nfs4_get_lease_time_res *res;
7187         struct nfs_client *clp;
7188 };
7189
7190 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7191                                         void *calldata)
7192 {
7193         struct nfs4_get_lease_time_data *data =
7194                         (struct nfs4_get_lease_time_data *)calldata;
7195
7196         dprintk("--> %s\n", __func__);
7197         /* just setup sequence, do not trigger session recovery
7198            since we're invoked within one */
7199         nfs41_setup_sequence(data->clp->cl_session,
7200                         &data->args->la_seq_args,
7201                         &data->res->lr_seq_res,
7202                         task);
7203         dprintk("<-- %s\n", __func__);
7204 }
7205
7206 /*
7207  * Called from nfs4_state_manager thread for session setup, so don't recover
7208  * from sequence operation or clientid errors.
7209  */
7210 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7211 {
7212         struct nfs4_get_lease_time_data *data =
7213                         (struct nfs4_get_lease_time_data *)calldata;
7214
7215         dprintk("--> %s\n", __func__);
7216         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7217                 return;
7218         switch (task->tk_status) {
7219         case -NFS4ERR_DELAY:
7220         case -NFS4ERR_GRACE:
7221                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7222                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7223                 task->tk_status = 0;
7224                 /* fall through */
7225         case -NFS4ERR_RETRY_UNCACHED_REP:
7226                 rpc_restart_call_prepare(task);
7227                 return;
7228         }
7229         dprintk("<-- %s\n", __func__);
7230 }
7231
7232 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7233         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7234         .rpc_call_done = nfs4_get_lease_time_done,
7235 };
7236
7237 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7238 {
7239         struct rpc_task *task;
7240         struct nfs4_get_lease_time_args args;
7241         struct nfs4_get_lease_time_res res = {
7242                 .lr_fsinfo = fsinfo,
7243         };
7244         struct nfs4_get_lease_time_data data = {
7245                 .args = &args,
7246                 .res = &res,
7247                 .clp = clp,
7248         };
7249         struct rpc_message msg = {
7250                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7251                 .rpc_argp = &args,
7252                 .rpc_resp = &res,
7253         };
7254         struct rpc_task_setup task_setup = {
7255                 .rpc_client = clp->cl_rpcclient,
7256                 .rpc_message = &msg,
7257                 .callback_ops = &nfs4_get_lease_time_ops,
7258                 .callback_data = &data,
7259                 .flags = RPC_TASK_TIMEOUT,
7260         };
7261         int status;
7262
7263         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7264         nfs4_set_sequence_privileged(&args.la_seq_args);
7265         dprintk("--> %s\n", __func__);
7266         task = rpc_run_task(&task_setup);
7267
7268         if (IS_ERR(task))
7269                 status = PTR_ERR(task);
7270         else {
7271                 status = task->tk_status;
7272                 rpc_put_task(task);
7273         }
7274         dprintk("<-- %s return %d\n", __func__, status);
7275
7276         return status;
7277 }
7278
7279 /*
7280  * Initialize the values to be used by the client in CREATE_SESSION
7281  * If nfs4_init_session set the fore channel request and response sizes,
7282  * use them.
7283  *
7284  * Set the back channel max_resp_sz_cached to zero to force the client to
7285  * always set csa_cachethis to FALSE because the current implementation
7286  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7287  */
7288 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7289 {
7290         unsigned int max_rqst_sz, max_resp_sz;
7291
7292         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7293         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7294
7295         /* Fore channel attributes */
7296         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7297         args->fc_attrs.max_resp_sz = max_resp_sz;
7298         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7299         args->fc_attrs.max_reqs = max_session_slots;
7300
7301         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7302                 "max_ops=%u max_reqs=%u\n",
7303                 __func__,
7304                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7305                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7306
7307         /* Back channel attributes */
7308         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7309         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7310         args->bc_attrs.max_resp_sz_cached = 0;
7311         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7312         args->bc_attrs.max_reqs = 1;
7313
7314         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7315                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7316                 __func__,
7317                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7318                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7319                 args->bc_attrs.max_reqs);
7320 }
7321
7322 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
7323                 struct nfs41_create_session_res *res)
7324 {
7325         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7326         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
7327
7328         if (rcvd->max_resp_sz > sent->max_resp_sz)
7329                 return -EINVAL;
7330         /*
7331          * Our requested max_ops is the minimum we need; we're not
7332          * prepared to break up compounds into smaller pieces than that.
7333          * So, no point even trying to continue if the server won't
7334          * cooperate:
7335          */
7336         if (rcvd->max_ops < sent->max_ops)
7337                 return -EINVAL;
7338         if (rcvd->max_reqs == 0)
7339                 return -EINVAL;
7340         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7341                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7342         return 0;
7343 }
7344
7345 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
7346                 struct nfs41_create_session_res *res)
7347 {
7348         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7349         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
7350
7351         if (!(res->flags & SESSION4_BACK_CHAN))
7352                 goto out;
7353         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7354                 return -EINVAL;
7355         if (rcvd->max_resp_sz < sent->max_resp_sz)
7356                 return -EINVAL;
7357         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7358                 return -EINVAL;
7359         /* These would render the backchannel useless: */
7360         if (rcvd->max_ops != sent->max_ops)
7361                 return -EINVAL;
7362         if (rcvd->max_reqs != sent->max_reqs)
7363                 return -EINVAL;
7364 out:
7365         return 0;
7366 }
7367
7368 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7369                                      struct nfs41_create_session_res *res)
7370 {
7371         int ret;
7372
7373         ret = nfs4_verify_fore_channel_attrs(args, res);
7374         if (ret)
7375                 return ret;
7376         return nfs4_verify_back_channel_attrs(args, res);
7377 }
7378
7379 static void nfs4_update_session(struct nfs4_session *session,
7380                 struct nfs41_create_session_res *res)
7381 {
7382         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
7383         /* Mark client id and session as being confirmed */
7384         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
7385         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
7386         session->flags = res->flags;
7387         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
7388         if (res->flags & SESSION4_BACK_CHAN)
7389                 memcpy(&session->bc_attrs, &res->bc_attrs,
7390                                 sizeof(session->bc_attrs));
7391 }
7392
7393 static int _nfs4_proc_create_session(struct nfs_client *clp,
7394                 struct rpc_cred *cred)
7395 {
7396         struct nfs4_session *session = clp->cl_session;
7397         struct nfs41_create_session_args args = {
7398                 .client = clp,
7399                 .clientid = clp->cl_clientid,
7400                 .seqid = clp->cl_seqid,
7401                 .cb_program = NFS4_CALLBACK,
7402         };
7403         struct nfs41_create_session_res res;
7404
7405         struct rpc_message msg = {
7406                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7407                 .rpc_argp = &args,
7408                 .rpc_resp = &res,
7409                 .rpc_cred = cred,
7410         };
7411         int status;
7412
7413         nfs4_init_channel_attrs(&args);
7414         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7415
7416         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7417         trace_nfs4_create_session(clp, status);
7418
7419         if (!status) {
7420                 /* Verify the session's negotiated channel_attrs values */
7421                 status = nfs4_verify_channel_attrs(&args, &res);
7422                 /* Increment the clientid slot sequence id */
7423                 if (clp->cl_seqid == res.seqid)
7424                         clp->cl_seqid++;
7425                 if (status)
7426                         goto out;
7427                 nfs4_update_session(session, &res);
7428         }
7429 out:
7430         return status;
7431 }
7432
7433 /*
7434  * Issues a CREATE_SESSION operation to the server.
7435  * It is the responsibility of the caller to verify the session is
7436  * expired before calling this routine.
7437  */
7438 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7439 {
7440         int status;
7441         unsigned *ptr;
7442         struct nfs4_session *session = clp->cl_session;
7443
7444         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7445
7446         status = _nfs4_proc_create_session(clp, cred);
7447         if (status)
7448                 goto out;
7449
7450         /* Init or reset the session slot tables */
7451         status = nfs4_setup_session_slot_tables(session);
7452         dprintk("slot table setup returned %d\n", status);
7453         if (status)
7454                 goto out;
7455
7456         ptr = (unsigned *)&session->sess_id.data[0];
7457         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7458                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7459 out:
7460         dprintk("<-- %s\n", __func__);
7461         return status;
7462 }
7463
7464 /*
7465  * Issue the over-the-wire RPC DESTROY_SESSION.
7466  * The caller must serialize access to this routine.
7467  */
7468 int nfs4_proc_destroy_session(struct nfs4_session *session,
7469                 struct rpc_cred *cred)
7470 {
7471         struct rpc_message msg = {
7472                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7473                 .rpc_argp = session,
7474                 .rpc_cred = cred,
7475         };
7476         int status = 0;
7477
7478         dprintk("--> nfs4_proc_destroy_session\n");
7479
7480         /* session is still being setup */
7481         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
7482                 return 0;
7483
7484         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7485         trace_nfs4_destroy_session(session->clp, status);
7486
7487         if (status)
7488                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7489                         "Session has been destroyed regardless...\n", status);
7490
7491         dprintk("<-- nfs4_proc_destroy_session\n");
7492         return status;
7493 }
7494
7495 /*
7496  * Renew the cl_session lease.
7497  */
7498 struct nfs4_sequence_data {
7499         struct nfs_client *clp;
7500         struct nfs4_sequence_args args;
7501         struct nfs4_sequence_res res;
7502 };
7503
7504 static void nfs41_sequence_release(void *data)
7505 {
7506         struct nfs4_sequence_data *calldata = data;
7507         struct nfs_client *clp = calldata->clp;
7508
7509         if (atomic_read(&clp->cl_count) > 1)
7510                 nfs4_schedule_state_renewal(clp);
7511         nfs_put_client(clp);
7512         kfree(calldata);
7513 }
7514
7515 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7516 {
7517         switch(task->tk_status) {
7518         case -NFS4ERR_DELAY:
7519                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7520                 return -EAGAIN;
7521         default:
7522                 nfs4_schedule_lease_recovery(clp);
7523         }
7524         return 0;
7525 }
7526
7527 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7528 {
7529         struct nfs4_sequence_data *calldata = data;
7530         struct nfs_client *clp = calldata->clp;
7531
7532         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7533                 return;
7534
7535         trace_nfs4_sequence(clp, task->tk_status);
7536         if (task->tk_status < 0) {
7537                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7538                 if (atomic_read(&clp->cl_count) == 1)
7539                         goto out;
7540
7541                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7542                         rpc_restart_call_prepare(task);
7543                         return;
7544                 }
7545         }
7546         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7547 out:
7548         dprintk("<-- %s\n", __func__);
7549 }
7550
7551 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7552 {
7553         struct nfs4_sequence_data *calldata = data;
7554         struct nfs_client *clp = calldata->clp;
7555         struct nfs4_sequence_args *args;
7556         struct nfs4_sequence_res *res;
7557
7558         args = task->tk_msg.rpc_argp;
7559         res = task->tk_msg.rpc_resp;
7560
7561         nfs41_setup_sequence(clp->cl_session, args, res, task);
7562 }
7563
7564 static const struct rpc_call_ops nfs41_sequence_ops = {
7565         .rpc_call_done = nfs41_sequence_call_done,
7566         .rpc_call_prepare = nfs41_sequence_prepare,
7567         .rpc_release = nfs41_sequence_release,
7568 };
7569
7570 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7571                 struct rpc_cred *cred,
7572                 bool is_privileged)
7573 {
7574         struct nfs4_sequence_data *calldata;
7575         struct rpc_message msg = {
7576                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7577                 .rpc_cred = cred,
7578         };
7579         struct rpc_task_setup task_setup_data = {
7580                 .rpc_client = clp->cl_rpcclient,
7581                 .rpc_message = &msg,
7582                 .callback_ops = &nfs41_sequence_ops,
7583                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7584         };
7585
7586         if (!atomic_inc_not_zero(&clp->cl_count))
7587                 return ERR_PTR(-EIO);
7588         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7589         if (calldata == NULL) {
7590                 nfs_put_client(clp);
7591                 return ERR_PTR(-ENOMEM);
7592         }
7593         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7594         if (is_privileged)
7595                 nfs4_set_sequence_privileged(&calldata->args);
7596         msg.rpc_argp = &calldata->args;
7597         msg.rpc_resp = &calldata->res;
7598         calldata->clp = clp;
7599         task_setup_data.callback_data = calldata;
7600
7601         return rpc_run_task(&task_setup_data);
7602 }
7603
7604 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7605 {
7606         struct rpc_task *task;
7607         int ret = 0;
7608
7609         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7610                 return -EAGAIN;
7611         task = _nfs41_proc_sequence(clp, cred, false);
7612         if (IS_ERR(task))
7613                 ret = PTR_ERR(task);
7614         else
7615                 rpc_put_task_async(task);
7616         dprintk("<-- %s status=%d\n", __func__, ret);
7617         return ret;
7618 }
7619
7620 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7621 {
7622         struct rpc_task *task;
7623         int ret;
7624
7625         task = _nfs41_proc_sequence(clp, cred, true);
7626         if (IS_ERR(task)) {
7627                 ret = PTR_ERR(task);
7628                 goto out;
7629         }
7630         ret = rpc_wait_for_completion_task(task);
7631         if (!ret)
7632                 ret = task->tk_status;
7633         rpc_put_task(task);
7634 out:
7635         dprintk("<-- %s status=%d\n", __func__, ret);
7636         return ret;
7637 }
7638
7639 struct nfs4_reclaim_complete_data {
7640         struct nfs_client *clp;
7641         struct nfs41_reclaim_complete_args arg;
7642         struct nfs41_reclaim_complete_res res;
7643 };
7644
7645 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7646 {
7647         struct nfs4_reclaim_complete_data *calldata = data;
7648
7649         nfs41_setup_sequence(calldata->clp->cl_session,
7650                         &calldata->arg.seq_args,
7651                         &calldata->res.seq_res,
7652                         task);
7653 }
7654
7655 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7656 {
7657         switch(task->tk_status) {
7658         case 0:
7659         case -NFS4ERR_COMPLETE_ALREADY:
7660         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7661                 break;
7662         case -NFS4ERR_DELAY:
7663                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7664                 /* fall through */
7665         case -NFS4ERR_RETRY_UNCACHED_REP:
7666                 return -EAGAIN;
7667         default:
7668                 nfs4_schedule_lease_recovery(clp);
7669         }
7670         return 0;
7671 }
7672
7673 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7674 {
7675         struct nfs4_reclaim_complete_data *calldata = data;
7676         struct nfs_client *clp = calldata->clp;
7677         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7678
7679         dprintk("--> %s\n", __func__);
7680         if (!nfs41_sequence_done(task, res))
7681                 return;
7682
7683         trace_nfs4_reclaim_complete(clp, task->tk_status);
7684         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7685                 rpc_restart_call_prepare(task);
7686                 return;
7687         }
7688         dprintk("<-- %s\n", __func__);
7689 }
7690
7691 static void nfs4_free_reclaim_complete_data(void *data)
7692 {
7693         struct nfs4_reclaim_complete_data *calldata = data;
7694
7695         kfree(calldata);
7696 }
7697
7698 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7699         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7700         .rpc_call_done = nfs4_reclaim_complete_done,
7701         .rpc_release = nfs4_free_reclaim_complete_data,
7702 };
7703
7704 /*
7705  * Issue a global reclaim complete.
7706  */
7707 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7708                 struct rpc_cred *cred)
7709 {
7710         struct nfs4_reclaim_complete_data *calldata;
7711         struct rpc_task *task;
7712         struct rpc_message msg = {
7713                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7714                 .rpc_cred = cred,
7715         };
7716         struct rpc_task_setup task_setup_data = {
7717                 .rpc_client = clp->cl_rpcclient,
7718                 .rpc_message = &msg,
7719                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7720                 .flags = RPC_TASK_ASYNC,
7721         };
7722         int status = -ENOMEM;
7723
7724         dprintk("--> %s\n", __func__);
7725         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7726         if (calldata == NULL)
7727                 goto out;
7728         calldata->clp = clp;
7729         calldata->arg.one_fs = 0;
7730
7731         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7732         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7733         msg.rpc_argp = &calldata->arg;
7734         msg.rpc_resp = &calldata->res;
7735         task_setup_data.callback_data = calldata;
7736         task = rpc_run_task(&task_setup_data);
7737         if (IS_ERR(task)) {
7738                 status = PTR_ERR(task);
7739                 goto out;
7740         }
7741         status = nfs4_wait_for_completion_rpc_task(task);
7742         if (status == 0)
7743                 status = task->tk_status;
7744         rpc_put_task(task);
7745         return 0;
7746 out:
7747         dprintk("<-- %s status=%d\n", __func__, status);
7748         return status;
7749 }
7750
7751 static void
7752 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7753 {
7754         struct nfs4_layoutget *lgp = calldata;
7755         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7756         struct nfs4_session *session = nfs4_get_session(server);
7757         int ret;
7758
7759         dprintk("--> %s\n", __func__);
7760         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7761          * right now covering the LAYOUTGET we are about to send.
7762          * However, that is not so catastrophic, and there seems
7763          * to be no way to prevent it completely.
7764          */
7765         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7766                                 &lgp->res.seq_res, task))
7767                 return;
7768         ret = pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7769                                           NFS_I(lgp->args.inode)->layout,
7770                                           &lgp->args.range,
7771                                           lgp->args.ctx->state);
7772         if (ret < 0)
7773                 rpc_exit(task, ret);
7774 }
7775
7776 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7777 {
7778         struct nfs4_layoutget *lgp = calldata;
7779         struct inode *inode = lgp->args.inode;
7780         struct nfs_server *server = NFS_SERVER(inode);
7781         struct pnfs_layout_hdr *lo;
7782         struct nfs4_state *state = NULL;
7783         unsigned long timeo, now, giveup;
7784
7785         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7786
7787         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7788                 goto out;
7789
7790         switch (task->tk_status) {
7791         case 0:
7792                 goto out;
7793
7794         /*
7795          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
7796          * on the file. set tk_status to -ENODATA to tell upper layer to
7797          * retry go inband.
7798          */
7799         case -NFS4ERR_LAYOUTUNAVAILABLE:
7800                 task->tk_status = -ENODATA;
7801                 goto out;
7802         /*
7803          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
7804          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
7805          */
7806         case -NFS4ERR_BADLAYOUT:
7807                 goto out_overflow;
7808         /*
7809          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7810          * (or clients) writing to the same RAID stripe except when
7811          * the minlength argument is 0 (see RFC5661 section 18.43.3).
7812          */
7813         case -NFS4ERR_LAYOUTTRYLATER:
7814                 if (lgp->args.minlength == 0)
7815                         goto out_overflow;
7816         /*
7817          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7818          * existing layout before getting a new one).
7819          */
7820         case -NFS4ERR_RECALLCONFLICT:
7821                 timeo = rpc_get_timeout(task->tk_client);
7822                 giveup = lgp->args.timestamp + timeo;
7823                 now = jiffies;
7824                 if (time_after(giveup, now)) {
7825                         unsigned long delay;
7826
7827                         /* Delay for:
7828                          * - Not less then NFS4_POLL_RETRY_MIN.
7829                          * - One last time a jiffie before we give up
7830                          * - exponential backoff (time_now minus start_attempt)
7831                          */
7832                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7833                                     min((giveup - now - 1),
7834                                         now - lgp->args.timestamp));
7835
7836                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7837                                 __func__, delay);
7838                         rpc_delay(task, delay);
7839                         /* Do not call nfs4_async_handle_error() */
7840                         goto out_restart;
7841                 }
7842                 break;
7843         case -NFS4ERR_EXPIRED:
7844         case -NFS4ERR_BAD_STATEID:
7845                 spin_lock(&inode->i_lock);
7846                 if (nfs4_stateid_match(&lgp->args.stateid,
7847                                         &lgp->args.ctx->state->stateid)) {
7848                         spin_unlock(&inode->i_lock);
7849                         /* If the open stateid was bad, then recover it. */
7850                         state = lgp->args.ctx->state;
7851                         break;
7852                 }
7853                 lo = NFS_I(inode)->layout;
7854                 if (lo && nfs4_stateid_match(&lgp->args.stateid,
7855                                         &lo->plh_stateid)) {
7856                         LIST_HEAD(head);
7857
7858                         /*
7859                          * Mark the bad layout state as invalid, then retry
7860                          * with the current stateid.
7861                          */
7862                         set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
7863                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7864                         spin_unlock(&inode->i_lock);
7865                         pnfs_free_lseg_list(&head);
7866                 } else
7867                         spin_unlock(&inode->i_lock);
7868                 goto out_restart;
7869         }
7870         if (nfs4_async_handle_error(task, server, state, &lgp->timeout) == -EAGAIN)
7871                 goto out_restart;
7872 out:
7873         dprintk("<-- %s\n", __func__);
7874         return;
7875 out_restart:
7876         task->tk_status = 0;
7877         rpc_restart_call_prepare(task);
7878         return;
7879 out_overflow:
7880         task->tk_status = -EOVERFLOW;
7881         goto out;
7882 }
7883
7884 static size_t max_response_pages(struct nfs_server *server)
7885 {
7886         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7887         return nfs_page_array_len(0, max_resp_sz);
7888 }
7889
7890 static void nfs4_free_pages(struct page **pages, size_t size)
7891 {
7892         int i;
7893
7894         if (!pages)
7895                 return;
7896
7897         for (i = 0; i < size; i++) {
7898                 if (!pages[i])
7899                         break;
7900                 __free_page(pages[i]);
7901         }
7902         kfree(pages);
7903 }
7904
7905 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7906 {
7907         struct page **pages;
7908         int i;
7909
7910         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7911         if (!pages) {
7912                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7913                 return NULL;
7914         }
7915
7916         for (i = 0; i < size; i++) {
7917                 pages[i] = alloc_page(gfp_flags);
7918                 if (!pages[i]) {
7919                         dprintk("%s: failed to allocate page\n", __func__);
7920                         nfs4_free_pages(pages, size);
7921                         return NULL;
7922                 }
7923         }
7924
7925         return pages;
7926 }
7927
7928 static void nfs4_layoutget_release(void *calldata)
7929 {
7930         struct nfs4_layoutget *lgp = calldata;
7931         struct inode *inode = lgp->args.inode;
7932         struct nfs_server *server = NFS_SERVER(inode);
7933         size_t max_pages = max_response_pages(server);
7934
7935         dprintk("--> %s\n", __func__);
7936         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7937         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7938         put_nfs_open_context(lgp->args.ctx);
7939         kfree(calldata);
7940         dprintk("<-- %s\n", __func__);
7941 }
7942
7943 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7944         .rpc_call_prepare = nfs4_layoutget_prepare,
7945         .rpc_call_done = nfs4_layoutget_done,
7946         .rpc_release = nfs4_layoutget_release,
7947 };
7948
7949 struct pnfs_layout_segment *
7950 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7951 {
7952         struct inode *inode = lgp->args.inode;
7953         struct nfs_server *server = NFS_SERVER(inode);
7954         size_t max_pages = max_response_pages(server);
7955         struct rpc_task *task;
7956         struct rpc_message msg = {
7957                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7958                 .rpc_argp = &lgp->args,
7959                 .rpc_resp = &lgp->res,
7960                 .rpc_cred = lgp->cred,
7961         };
7962         struct rpc_task_setup task_setup_data = {
7963                 .rpc_client = server->client,
7964                 .rpc_message = &msg,
7965                 .callback_ops = &nfs4_layoutget_call_ops,
7966                 .callback_data = lgp,
7967                 .flags = RPC_TASK_ASYNC,
7968         };
7969         struct pnfs_layout_segment *lseg = NULL;
7970         int status = 0;
7971
7972         dprintk("--> %s\n", __func__);
7973
7974         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7975         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7976
7977         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7978         if (!lgp->args.layout.pages) {
7979                 nfs4_layoutget_release(lgp);
7980                 return ERR_PTR(-ENOMEM);
7981         }
7982         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7983         lgp->args.timestamp = jiffies;
7984
7985         lgp->res.layoutp = &lgp->args.layout;
7986         lgp->res.seq_res.sr_slot = NULL;
7987         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7988
7989         task = rpc_run_task(&task_setup_data);
7990         if (IS_ERR(task))
7991                 return ERR_CAST(task);
7992         status = nfs4_wait_for_completion_rpc_task(task);
7993         if (status == 0)
7994                 status = task->tk_status;
7995         trace_nfs4_layoutget(lgp->args.ctx,
7996                         &lgp->args.range,
7997                         &lgp->res.range,
7998                         &lgp->res.stateid,
7999                         status);
8000         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
8001         if (status == 0 && lgp->res.layoutp->len)
8002                 lseg = pnfs_layout_process(lgp);
8003         rpc_put_task(task);
8004         dprintk("<-- %s status=%d\n", __func__, status);
8005         if (status)
8006                 return ERR_PTR(status);
8007         return lseg;
8008 }
8009
8010 static void
8011 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
8012 {
8013         struct nfs4_layoutreturn *lrp = calldata;
8014
8015         dprintk("--> %s\n", __func__);
8016         nfs41_setup_sequence(lrp->clp->cl_session,
8017                         &lrp->args.seq_args,
8018                         &lrp->res.seq_res,
8019                         task);
8020 }
8021
8022 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
8023 {
8024         struct nfs4_layoutreturn *lrp = calldata;
8025         struct nfs_server *server;
8026
8027         dprintk("--> %s\n", __func__);
8028
8029         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
8030                 return;
8031
8032         server = NFS_SERVER(lrp->args.inode);
8033         switch (task->tk_status) {
8034         default:
8035                 task->tk_status = 0;
8036         case 0:
8037                 break;
8038         case -NFS4ERR_DELAY:
8039                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
8040                         break;
8041                 rpc_restart_call_prepare(task);
8042                 return;
8043         }
8044         dprintk("<-- %s\n", __func__);
8045 }
8046
8047 static void nfs4_layoutreturn_release(void *calldata)
8048 {
8049         struct nfs4_layoutreturn *lrp = calldata;
8050         struct pnfs_layout_hdr *lo = lrp->args.layout;
8051         LIST_HEAD(freeme);
8052
8053         dprintk("--> %s\n", __func__);
8054         spin_lock(&lo->plh_inode->i_lock);
8055         pnfs_mark_matching_lsegs_invalid(lo, &freeme, &lrp->args.range);
8056         pnfs_mark_layout_returned_if_empty(lo);
8057         if (lrp->res.lrs_present)
8058                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
8059         pnfs_clear_layoutreturn_waitbit(lo);
8060         spin_unlock(&lo->plh_inode->i_lock);
8061         pnfs_free_lseg_list(&freeme);
8062         pnfs_put_layout_hdr(lrp->args.layout);
8063         nfs_iput_and_deactive(lrp->inode);
8064         kfree(calldata);
8065         dprintk("<-- %s\n", __func__);
8066 }
8067
8068 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
8069         .rpc_call_prepare = nfs4_layoutreturn_prepare,
8070         .rpc_call_done = nfs4_layoutreturn_done,
8071         .rpc_release = nfs4_layoutreturn_release,
8072 };
8073
8074 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
8075 {
8076         struct rpc_task *task;
8077         struct rpc_message msg = {
8078                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
8079                 .rpc_argp = &lrp->args,
8080                 .rpc_resp = &lrp->res,
8081                 .rpc_cred = lrp->cred,
8082         };
8083         struct rpc_task_setup task_setup_data = {
8084                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
8085                 .rpc_message = &msg,
8086                 .callback_ops = &nfs4_layoutreturn_call_ops,
8087                 .callback_data = lrp,
8088         };
8089         int status = 0;
8090
8091         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
8092                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
8093                         &task_setup_data.rpc_client, &msg);
8094
8095         dprintk("--> %s\n", __func__);
8096         if (!sync) {
8097                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
8098                 if (!lrp->inode) {
8099                         nfs4_layoutreturn_release(lrp);
8100                         return -EAGAIN;
8101                 }
8102                 task_setup_data.flags |= RPC_TASK_ASYNC;
8103         }
8104         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
8105         task = rpc_run_task(&task_setup_data);
8106         if (IS_ERR(task))
8107                 return PTR_ERR(task);
8108         if (sync)
8109                 status = task->tk_status;
8110         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
8111         dprintk("<-- %s status=%d\n", __func__, status);
8112         rpc_put_task(task);
8113         return status;
8114 }
8115
8116 static int
8117 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
8118                 struct pnfs_device *pdev,
8119                 struct rpc_cred *cred)
8120 {
8121         struct nfs4_getdeviceinfo_args args = {
8122                 .pdev = pdev,
8123                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
8124                         NOTIFY_DEVICEID4_DELETE,
8125         };
8126         struct nfs4_getdeviceinfo_res res = {
8127                 .pdev = pdev,
8128         };
8129         struct rpc_message msg = {
8130                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
8131                 .rpc_argp = &args,
8132                 .rpc_resp = &res,
8133                 .rpc_cred = cred,
8134         };
8135         int status;
8136
8137         dprintk("--> %s\n", __func__);
8138         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
8139         if (res.notification & ~args.notify_types)
8140                 dprintk("%s: unsupported notification\n", __func__);
8141         if (res.notification != args.notify_types)
8142                 pdev->nocache = 1;
8143
8144         dprintk("<-- %s status=%d\n", __func__, status);
8145
8146         return status;
8147 }
8148
8149 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
8150                 struct pnfs_device *pdev,
8151                 struct rpc_cred *cred)
8152 {
8153         struct nfs4_exception exception = { };
8154         int err;
8155
8156         do {
8157                 err = nfs4_handle_exception(server,
8158                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
8159                                         &exception);
8160         } while (exception.retry);
8161         return err;
8162 }
8163 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
8164
8165 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
8166 {
8167         struct nfs4_layoutcommit_data *data = calldata;
8168         struct nfs_server *server = NFS_SERVER(data->args.inode);
8169         struct nfs4_session *session = nfs4_get_session(server);
8170
8171         nfs41_setup_sequence(session,
8172                         &data->args.seq_args,
8173                         &data->res.seq_res,
8174                         task);
8175 }
8176
8177 static void
8178 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
8179 {
8180         struct nfs4_layoutcommit_data *data = calldata;
8181         struct nfs_server *server = NFS_SERVER(data->args.inode);
8182
8183         if (!nfs41_sequence_done(task, &data->res.seq_res))
8184                 return;
8185
8186         switch (task->tk_status) { /* Just ignore these failures */
8187         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
8188         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
8189         case -NFS4ERR_BADLAYOUT:     /* no layout */
8190         case -NFS4ERR_GRACE:        /* loca_recalim always false */
8191                 task->tk_status = 0;
8192         case 0:
8193                 break;
8194         default:
8195                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
8196                         rpc_restart_call_prepare(task);
8197                         return;
8198                 }
8199         }
8200 }
8201
8202 static void nfs4_layoutcommit_release(void *calldata)
8203 {
8204         struct nfs4_layoutcommit_data *data = calldata;
8205
8206         pnfs_cleanup_layoutcommit(data);
8207         nfs_post_op_update_inode_force_wcc(data->args.inode,
8208                                            data->res.fattr);
8209         put_rpccred(data->cred);
8210         nfs_iput_and_deactive(data->inode);
8211         kfree(data);
8212 }
8213
8214 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
8215         .rpc_call_prepare = nfs4_layoutcommit_prepare,
8216         .rpc_call_done = nfs4_layoutcommit_done,
8217         .rpc_release = nfs4_layoutcommit_release,
8218 };
8219
8220 int
8221 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
8222 {
8223         struct rpc_message msg = {
8224                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
8225                 .rpc_argp = &data->args,
8226                 .rpc_resp = &data->res,
8227                 .rpc_cred = data->cred,
8228         };
8229         struct rpc_task_setup task_setup_data = {
8230                 .task = &data->task,
8231                 .rpc_client = NFS_CLIENT(data->args.inode),
8232                 .rpc_message = &msg,
8233                 .callback_ops = &nfs4_layoutcommit_ops,
8234                 .callback_data = data,
8235         };
8236         struct rpc_task *task;
8237         int status = 0;
8238
8239         dprintk("NFS: initiating layoutcommit call. sync %d "
8240                 "lbw: %llu inode %lu\n", sync,
8241                 data->args.lastbytewritten,
8242                 data->args.inode->i_ino);
8243
8244         if (!sync) {
8245                 data->inode = nfs_igrab_and_active(data->args.inode);
8246                 if (data->inode == NULL) {
8247                         nfs4_layoutcommit_release(data);
8248                         return -EAGAIN;
8249                 }
8250                 task_setup_data.flags = RPC_TASK_ASYNC;
8251         }
8252         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8253         task = rpc_run_task(&task_setup_data);
8254         if (IS_ERR(task))
8255                 return PTR_ERR(task);
8256         if (sync)
8257                 status = task->tk_status;
8258         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
8259         dprintk("%s: status %d\n", __func__, status);
8260         rpc_put_task(task);
8261         return status;
8262 }
8263
8264 /**
8265  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8266  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8267  */
8268 static int
8269 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8270                     struct nfs_fsinfo *info,
8271                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8272 {
8273         struct nfs41_secinfo_no_name_args args = {
8274                 .style = SECINFO_STYLE_CURRENT_FH,
8275         };
8276         struct nfs4_secinfo_res res = {
8277                 .flavors = flavors,
8278         };
8279         struct rpc_message msg = {
8280                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8281                 .rpc_argp = &args,
8282                 .rpc_resp = &res,
8283         };
8284         struct rpc_clnt *clnt = server->client;
8285         struct rpc_cred *cred = NULL;
8286         int status;
8287
8288         if (use_integrity) {
8289                 clnt = server->nfs_client->cl_rpcclient;
8290                 cred = nfs4_get_clid_cred(server->nfs_client);
8291                 msg.rpc_cred = cred;
8292         }
8293
8294         dprintk("--> %s\n", __func__);
8295         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8296                                 &res.seq_res, 0);
8297         dprintk("<-- %s status=%d\n", __func__, status);
8298
8299         if (cred)
8300                 put_rpccred(cred);
8301
8302         return status;
8303 }
8304
8305 static int
8306 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8307                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8308 {
8309         struct nfs4_exception exception = { };
8310         int err;
8311         do {
8312                 /* first try using integrity protection */
8313                 err = -NFS4ERR_WRONGSEC;
8314
8315                 /* try to use integrity protection with machine cred */
8316                 if (_nfs4_is_integrity_protected(server->nfs_client))
8317                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8318                                                           flavors, true);
8319
8320                 /*
8321                  * if unable to use integrity protection, or SECINFO with
8322                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8323                  * disallowed by spec, but exists in deployed servers) use
8324                  * the current filesystem's rpc_client and the user cred.
8325                  */
8326                 if (err == -NFS4ERR_WRONGSEC)
8327                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8328                                                           flavors, false);
8329
8330                 switch (err) {
8331                 case 0:
8332                 case -NFS4ERR_WRONGSEC:
8333                 case -ENOTSUPP:
8334                         goto out;
8335                 default:
8336                         err = nfs4_handle_exception(server, err, &exception);
8337                 }
8338         } while (exception.retry);
8339 out:
8340         return err;
8341 }
8342
8343 static int
8344 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8345                     struct nfs_fsinfo *info)
8346 {
8347         int err;
8348         struct page *page;
8349         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8350         struct nfs4_secinfo_flavors *flavors;
8351         struct nfs4_secinfo4 *secinfo;
8352         int i;
8353
8354         page = alloc_page(GFP_KERNEL);
8355         if (!page) {
8356                 err = -ENOMEM;
8357                 goto out;
8358         }
8359
8360         flavors = page_address(page);
8361         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8362
8363         /*
8364          * Fall back on "guess and check" method if
8365          * the server doesn't support SECINFO_NO_NAME
8366          */
8367         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8368                 err = nfs4_find_root_sec(server, fhandle, info);
8369                 goto out_freepage;
8370         }
8371         if (err)
8372                 goto out_freepage;
8373
8374         for (i = 0; i < flavors->num_flavors; i++) {
8375                 secinfo = &flavors->flavors[i];
8376
8377                 switch (secinfo->flavor) {
8378                 case RPC_AUTH_NULL:
8379                 case RPC_AUTH_UNIX:
8380                 case RPC_AUTH_GSS:
8381                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8382                                         &secinfo->flavor_info);
8383                         break;
8384                 default:
8385                         flavor = RPC_AUTH_MAXFLAVOR;
8386                         break;
8387                 }
8388
8389                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8390                         flavor = RPC_AUTH_MAXFLAVOR;
8391
8392                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8393                         err = nfs4_lookup_root_sec(server, fhandle,
8394                                                    info, flavor);
8395                         if (!err)
8396                                 break;
8397                 }
8398         }
8399
8400         if (flavor == RPC_AUTH_MAXFLAVOR)
8401                 err = -EPERM;
8402
8403 out_freepage:
8404         put_page(page);
8405         if (err == -EACCES)
8406                 return -EPERM;
8407 out:
8408         return err;
8409 }
8410
8411 static int _nfs41_test_stateid(struct nfs_server *server,
8412                 nfs4_stateid *stateid,
8413                 struct rpc_cred *cred)
8414 {
8415         int status;
8416         struct nfs41_test_stateid_args args = {
8417                 .stateid = stateid,
8418         };
8419         struct nfs41_test_stateid_res res;
8420         struct rpc_message msg = {
8421                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8422                 .rpc_argp = &args,
8423                 .rpc_resp = &res,
8424                 .rpc_cred = cred,
8425         };
8426         struct rpc_clnt *rpc_client = server->client;
8427
8428         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8429                 &rpc_client, &msg);
8430
8431         dprintk("NFS call  test_stateid %p\n", stateid);
8432         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8433         nfs4_set_sequence_privileged(&args.seq_args);
8434         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8435                         &args.seq_args, &res.seq_res);
8436         if (status != NFS_OK) {
8437                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8438                 return status;
8439         }
8440         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8441         return -res.status;
8442 }
8443
8444 /**
8445  * nfs41_test_stateid - perform a TEST_STATEID operation
8446  *
8447  * @server: server / transport on which to perform the operation
8448  * @stateid: state ID to test
8449  * @cred: credential
8450  *
8451  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8452  * Otherwise a negative NFS4ERR value is returned if the operation
8453  * failed or the state ID is not currently valid.
8454  */
8455 static int nfs41_test_stateid(struct nfs_server *server,
8456                 nfs4_stateid *stateid,
8457                 struct rpc_cred *cred)
8458 {
8459         struct nfs4_exception exception = { };
8460         int err;
8461         do {
8462                 err = _nfs41_test_stateid(server, stateid, cred);
8463                 if (err != -NFS4ERR_DELAY)
8464                         break;
8465                 nfs4_handle_exception(server, err, &exception);
8466         } while (exception.retry);
8467         return err;
8468 }
8469
8470 struct nfs_free_stateid_data {
8471         struct nfs_server *server;
8472         struct nfs41_free_stateid_args args;
8473         struct nfs41_free_stateid_res res;
8474 };
8475
8476 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8477 {
8478         struct nfs_free_stateid_data *data = calldata;
8479         nfs41_setup_sequence(nfs4_get_session(data->server),
8480                         &data->args.seq_args,
8481                         &data->res.seq_res,
8482                         task);
8483 }
8484
8485 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8486 {
8487         struct nfs_free_stateid_data *data = calldata;
8488
8489         nfs41_sequence_done(task, &data->res.seq_res);
8490
8491         switch (task->tk_status) {
8492         case -NFS4ERR_DELAY:
8493                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8494                         rpc_restart_call_prepare(task);
8495         }
8496 }
8497
8498 static void nfs41_free_stateid_release(void *calldata)
8499 {
8500         kfree(calldata);
8501 }
8502
8503 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8504         .rpc_call_prepare = nfs41_free_stateid_prepare,
8505         .rpc_call_done = nfs41_free_stateid_done,
8506         .rpc_release = nfs41_free_stateid_release,
8507 };
8508
8509 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8510                 nfs4_stateid *stateid,
8511                 struct rpc_cred *cred,
8512                 bool privileged)
8513 {
8514         struct rpc_message msg = {
8515                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8516                 .rpc_cred = cred,
8517         };
8518         struct rpc_task_setup task_setup = {
8519                 .rpc_client = server->client,
8520                 .rpc_message = &msg,
8521                 .callback_ops = &nfs41_free_stateid_ops,
8522                 .flags = RPC_TASK_ASYNC,
8523         };
8524         struct nfs_free_stateid_data *data;
8525
8526         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8527                 &task_setup.rpc_client, &msg);
8528
8529         dprintk("NFS call  free_stateid %p\n", stateid);
8530         data = kmalloc(sizeof(*data), GFP_NOFS);
8531         if (!data)
8532                 return ERR_PTR(-ENOMEM);
8533         data->server = server;
8534         nfs4_stateid_copy(&data->args.stateid, stateid);
8535
8536         task_setup.callback_data = data;
8537
8538         msg.rpc_argp = &data->args;
8539         msg.rpc_resp = &data->res;
8540         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8541         if (privileged)
8542                 nfs4_set_sequence_privileged(&data->args.seq_args);
8543
8544         return rpc_run_task(&task_setup);
8545 }
8546
8547 /**
8548  * nfs41_free_stateid - perform a FREE_STATEID operation
8549  *
8550  * @server: server / transport on which to perform the operation
8551  * @stateid: state ID to release
8552  * @cred: credential
8553  *
8554  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8555  * negative NFS4ERR value is returned.
8556  */
8557 static int nfs41_free_stateid(struct nfs_server *server,
8558                 nfs4_stateid *stateid,
8559                 struct rpc_cred *cred)
8560 {
8561         struct rpc_task *task;
8562         int ret;
8563
8564         task = _nfs41_free_stateid(server, stateid, cred, true);
8565         if (IS_ERR(task))
8566                 return PTR_ERR(task);
8567         ret = rpc_wait_for_completion_task(task);
8568         if (!ret)
8569                 ret = task->tk_status;
8570         rpc_put_task(task);
8571         return ret;
8572 }
8573
8574 static void
8575 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8576 {
8577         struct rpc_task *task;
8578         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8579
8580         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8581         nfs4_free_lock_state(server, lsp);
8582         if (IS_ERR(task))
8583                 return;
8584         rpc_put_task(task);
8585 }
8586
8587 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8588                 const nfs4_stateid *s2)
8589 {
8590         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8591                 return false;
8592
8593         if (s1->seqid == s2->seqid)
8594                 return true;
8595         if (s1->seqid == 0 || s2->seqid == 0)
8596                 return true;
8597
8598         return false;
8599 }
8600
8601 #endif /* CONFIG_NFS_V4_1 */
8602
8603 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8604                 const nfs4_stateid *s2)
8605 {
8606         return nfs4_stateid_match(s1, s2);
8607 }
8608
8609
8610 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8611         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8612         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8613         .recover_open   = nfs4_open_reclaim,
8614         .recover_lock   = nfs4_lock_reclaim,
8615         .establish_clid = nfs4_init_clientid,
8616         .detect_trunking = nfs40_discover_server_trunking,
8617 };
8618
8619 #if defined(CONFIG_NFS_V4_1)
8620 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8621         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8622         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8623         .recover_open   = nfs4_open_reclaim,
8624         .recover_lock   = nfs4_lock_reclaim,
8625         .establish_clid = nfs41_init_clientid,
8626         .reclaim_complete = nfs41_proc_reclaim_complete,
8627         .detect_trunking = nfs41_discover_server_trunking,
8628 };
8629 #endif /* CONFIG_NFS_V4_1 */
8630
8631 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8632         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8633         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8634         .recover_open   = nfs40_open_expired,
8635         .recover_lock   = nfs4_lock_expired,
8636         .establish_clid = nfs4_init_clientid,
8637 };
8638
8639 #if defined(CONFIG_NFS_V4_1)
8640 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8641         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8642         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8643         .recover_open   = nfs41_open_expired,
8644         .recover_lock   = nfs41_lock_expired,
8645         .establish_clid = nfs41_init_clientid,
8646 };
8647 #endif /* CONFIG_NFS_V4_1 */
8648
8649 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8650         .sched_state_renewal = nfs4_proc_async_renew,
8651         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8652         .renew_lease = nfs4_proc_renew,
8653 };
8654
8655 #if defined(CONFIG_NFS_V4_1)
8656 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8657         .sched_state_renewal = nfs41_proc_async_sequence,
8658         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8659         .renew_lease = nfs4_proc_sequence,
8660 };
8661 #endif
8662
8663 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8664         .get_locations = _nfs40_proc_get_locations,
8665         .fsid_present = _nfs40_proc_fsid_present,
8666 };
8667
8668 #if defined(CONFIG_NFS_V4_1)
8669 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8670         .get_locations = _nfs41_proc_get_locations,
8671         .fsid_present = _nfs41_proc_fsid_present,
8672 };
8673 #endif  /* CONFIG_NFS_V4_1 */
8674
8675 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8676         .minor_version = 0,
8677         .init_caps = NFS_CAP_READDIRPLUS
8678                 | NFS_CAP_ATOMIC_OPEN
8679                 | NFS_CAP_POSIX_LOCK,
8680         .init_client = nfs40_init_client,
8681         .shutdown_client = nfs40_shutdown_client,
8682         .match_stateid = nfs4_match_stateid,
8683         .find_root_sec = nfs4_find_root_sec,
8684         .free_lock_state = nfs4_release_lockowner,
8685         .alloc_seqid = nfs_alloc_seqid,
8686         .call_sync_ops = &nfs40_call_sync_ops,
8687         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8688         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8689         .state_renewal_ops = &nfs40_state_renewal_ops,
8690         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8691 };
8692
8693 #if defined(CONFIG_NFS_V4_1)
8694 static struct nfs_seqid *
8695 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
8696 {
8697         return NULL;
8698 }
8699
8700 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8701         .minor_version = 1,
8702         .init_caps = NFS_CAP_READDIRPLUS
8703                 | NFS_CAP_ATOMIC_OPEN
8704                 | NFS_CAP_POSIX_LOCK
8705                 | NFS_CAP_STATEID_NFSV41
8706                 | NFS_CAP_ATOMIC_OPEN_V1,
8707         .init_client = nfs41_init_client,
8708         .shutdown_client = nfs41_shutdown_client,
8709         .match_stateid = nfs41_match_stateid,
8710         .find_root_sec = nfs41_find_root_sec,
8711         .free_lock_state = nfs41_free_lock_state,
8712         .alloc_seqid = nfs_alloc_no_seqid,
8713         .call_sync_ops = &nfs41_call_sync_ops,
8714         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8715         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8716         .state_renewal_ops = &nfs41_state_renewal_ops,
8717         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8718 };
8719 #endif
8720
8721 #if defined(CONFIG_NFS_V4_2)
8722 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8723         .minor_version = 2,
8724         .init_caps = NFS_CAP_READDIRPLUS
8725                 | NFS_CAP_ATOMIC_OPEN
8726                 | NFS_CAP_POSIX_LOCK
8727                 | NFS_CAP_STATEID_NFSV41
8728                 | NFS_CAP_ATOMIC_OPEN_V1
8729                 | NFS_CAP_ALLOCATE
8730                 | NFS_CAP_DEALLOCATE
8731                 | NFS_CAP_SEEK
8732                 | NFS_CAP_LAYOUTSTATS
8733                 | NFS_CAP_CLONE,
8734         .init_client = nfs41_init_client,
8735         .shutdown_client = nfs41_shutdown_client,
8736         .match_stateid = nfs41_match_stateid,
8737         .find_root_sec = nfs41_find_root_sec,
8738         .free_lock_state = nfs41_free_lock_state,
8739         .call_sync_ops = &nfs41_call_sync_ops,
8740         .alloc_seqid = nfs_alloc_no_seqid,
8741         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8742         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8743         .state_renewal_ops = &nfs41_state_renewal_ops,
8744         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8745 };
8746 #endif
8747
8748 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8749         [0] = &nfs_v4_0_minor_ops,
8750 #if defined(CONFIG_NFS_V4_1)
8751         [1] = &nfs_v4_1_minor_ops,
8752 #endif
8753 #if defined(CONFIG_NFS_V4_2)
8754         [2] = &nfs_v4_2_minor_ops,
8755 #endif
8756 };
8757
8758 ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
8759 {
8760         ssize_t error, error2;
8761
8762         error = generic_listxattr(dentry, list, size);
8763         if (error < 0)
8764                 return error;
8765         if (list) {
8766                 list += error;
8767                 size -= error;
8768         }
8769
8770         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
8771         if (error2 < 0)
8772                 return error2;
8773         return error + error2;
8774 }
8775
8776 static const struct inode_operations nfs4_dir_inode_operations = {
8777         .create         = nfs_create,
8778         .lookup         = nfs_lookup,
8779         .atomic_open    = nfs_atomic_open,
8780         .link           = nfs_link,
8781         .unlink         = nfs_unlink,
8782         .symlink        = nfs_symlink,
8783         .mkdir          = nfs_mkdir,
8784         .rmdir          = nfs_rmdir,
8785         .mknod          = nfs_mknod,
8786         .rename         = nfs_rename,
8787         .permission     = nfs_permission,
8788         .getattr        = nfs_getattr,
8789         .setattr        = nfs_setattr,
8790         .getxattr       = generic_getxattr,
8791         .setxattr       = generic_setxattr,
8792         .listxattr      = nfs4_listxattr,
8793         .removexattr    = generic_removexattr,
8794 };
8795
8796 static const struct inode_operations nfs4_file_inode_operations = {
8797         .permission     = nfs_permission,
8798         .getattr        = nfs_getattr,
8799         .setattr        = nfs_setattr,
8800         .getxattr       = generic_getxattr,
8801         .setxattr       = generic_setxattr,
8802         .listxattr      = nfs4_listxattr,
8803         .removexattr    = generic_removexattr,
8804 };
8805
8806 const struct nfs_rpc_ops nfs_v4_clientops = {
8807         .version        = 4,                    /* protocol version */
8808         .dentry_ops     = &nfs4_dentry_operations,
8809         .dir_inode_ops  = &nfs4_dir_inode_operations,
8810         .file_inode_ops = &nfs4_file_inode_operations,
8811         .file_ops       = &nfs4_file_operations,
8812         .getroot        = nfs4_proc_get_root,
8813         .submount       = nfs4_submount,
8814         .try_mount      = nfs4_try_mount,
8815         .getattr        = nfs4_proc_getattr,
8816         .setattr        = nfs4_proc_setattr,
8817         .lookup         = nfs4_proc_lookup,
8818         .access         = nfs4_proc_access,
8819         .readlink       = nfs4_proc_readlink,
8820         .create         = nfs4_proc_create,
8821         .remove         = nfs4_proc_remove,
8822         .unlink_setup   = nfs4_proc_unlink_setup,
8823         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8824         .unlink_done    = nfs4_proc_unlink_done,
8825         .rename_setup   = nfs4_proc_rename_setup,
8826         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8827         .rename_done    = nfs4_proc_rename_done,
8828         .link           = nfs4_proc_link,
8829         .symlink        = nfs4_proc_symlink,
8830         .mkdir          = nfs4_proc_mkdir,
8831         .rmdir          = nfs4_proc_remove,
8832         .readdir        = nfs4_proc_readdir,
8833         .mknod          = nfs4_proc_mknod,
8834         .statfs         = nfs4_proc_statfs,
8835         .fsinfo         = nfs4_proc_fsinfo,
8836         .pathconf       = nfs4_proc_pathconf,
8837         .set_capabilities = nfs4_server_capabilities,
8838         .decode_dirent  = nfs4_decode_dirent,
8839         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8840         .read_setup     = nfs4_proc_read_setup,
8841         .read_done      = nfs4_read_done,
8842         .write_setup    = nfs4_proc_write_setup,
8843         .write_done     = nfs4_write_done,
8844         .commit_setup   = nfs4_proc_commit_setup,
8845         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8846         .commit_done    = nfs4_commit_done,
8847         .lock           = nfs4_proc_lock,
8848         .clear_acl_cache = nfs4_zap_acl_attr,
8849         .close_context  = nfs4_close_context,
8850         .open_context   = nfs4_atomic_open,
8851         .have_delegation = nfs4_have_delegation,
8852         .return_delegation = nfs4_inode_return_delegation,
8853         .alloc_client   = nfs4_alloc_client,
8854         .init_client    = nfs4_init_client,
8855         .free_client    = nfs4_free_client,
8856         .create_server  = nfs4_create_server,
8857         .clone_server   = nfs_clone_server,
8858 };
8859
8860 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8861         .name   = XATTR_NAME_NFSV4_ACL,
8862         .list   = nfs4_xattr_list_nfs4_acl,
8863         .get    = nfs4_xattr_get_nfs4_acl,
8864         .set    = nfs4_xattr_set_nfs4_acl,
8865 };
8866
8867 const struct xattr_handler *nfs4_xattr_handlers[] = {
8868         &nfs4_xattr_nfs4_acl_handler,
8869 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8870         &nfs4_xattr_nfs4_label_handler,
8871 #endif
8872         NULL
8873 };
8874
8875 /*
8876  * Local variables:
8877  *  c-basic-offset: 8
8878  * End:
8879  */