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 /* file attributes which can be mapped to nfs attributes */
  78 #define NFS4_VALID_ATTRS (ATTR_MODE \
  79         | ATTR_UID \
  80         | ATTR_GID \
  81         | ATTR_SIZE \
  82         | ATTR_ATIME \
  83         | ATTR_MTIME \
  84         | ATTR_CTIME \
  85         | ATTR_ATIME_SET \
  86         | ATTR_MTIME_SET)
  87
  88 struct nfs4_opendata;
  89 static int _nfs4_proc_open(struct nfs4_opendata *data);
  90 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  91 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  92 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  93 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  94 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  95 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  96                             struct nfs_fattr *fattr, struct iattr *sattr,
  97                             struct nfs4_state *state, struct nfs4_label *ilabel,
  98                             struct nfs4_label *olabel);
  99 #ifdef CONFIG_NFS_V4_1
 100 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 101                 struct rpc_cred *);
 102 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
 103                 struct rpc_cred *);
 104 #endif
 105
 106 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 107 static inline struct nfs4_label *
 108 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 109         struct iattr *sattr, struct nfs4_label *label)
 110 {
 111         int err;
 112
 113         if (label == NULL)
 114                 return NULL;
 115
 116         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 117                 return NULL;
 118
 119         err = security_dentry_init_security(dentry, sattr->ia_mode,
 120                                 &dentry->d_name, (void **)&label->label, &label->len);
 121         if (err == 0)
 122                 return label;
 123
 124         return NULL;
 125 }
 126 static inline void
 127 nfs4_label_release_security(struct nfs4_label *label)
 128 {
 129         if (label)
 130                 security_release_secctx(label->label, label->len);
 131 }
 132 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 133 {
 134         if (label)
 135                 return server->attr_bitmask;
 136
 137         return server->attr_bitmask_nl;
 138 }
 139 #else
 140 static inline struct nfs4_label *
 141 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 142         struct iattr *sattr, struct nfs4_label *l)
 143 { return NULL; }
 144 static inline void
 145 nfs4_label_release_security(struct nfs4_label *label)
 146 { return; }
 147 static inline u32 *
 148 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 149 { return server->attr_bitmask; }
 150 #endif
 151
 152 /* Prevent leaks of NFSv4 errors into userland */
 153 static int nfs4_map_errors(int err)
 154 {
 155         if (err >= -1000)
 156                 return err;
 157         switch (err) {
 158         case -NFS4ERR_RESOURCE:
 159         case -NFS4ERR_LAYOUTTRYLATER:
 160         case -NFS4ERR_RECALLCONFLICT:
 161                 return -EREMOTEIO;
 162         case -NFS4ERR_WRONGSEC:
 163         case -NFS4ERR_WRONG_CRED:
 164                 return -EPERM;
 165         case -NFS4ERR_BADOWNER:
 166         case -NFS4ERR_BADNAME:
 167                 return -EINVAL;
 168         case -NFS4ERR_SHARE_DENIED:
 169                 return -EACCES;
 170         case -NFS4ERR_MINOR_VERS_MISMATCH:
 171                 return -EPROTONOSUPPORT;
 172         case -NFS4ERR_FILE_OPEN:
 173                 return -EBUSY;
 174         default:
 175                 dprintk("%s could not handle NFSv4 error %d\n",
 176                                 __func__, -err);
 177                 break;
 178         }
 179         return -EIO;
 180 }
 181
 182 /*
 183  * This is our standard bitmap for GETATTR requests.
 184  */
 185 const u32 nfs4_fattr_bitmap[3] = {
 186         FATTR4_WORD0_TYPE
 187         | FATTR4_WORD0_CHANGE
 188         | FATTR4_WORD0_SIZE
 189         | FATTR4_WORD0_FSID
 190         | FATTR4_WORD0_FILEID,
 191         FATTR4_WORD1_MODE
 192         | FATTR4_WORD1_NUMLINKS
 193         | FATTR4_WORD1_OWNER
 194         | FATTR4_WORD1_OWNER_GROUP
 195         | FATTR4_WORD1_RAWDEV
 196         | FATTR4_WORD1_SPACE_USED
 197         | FATTR4_WORD1_TIME_ACCESS
 198         | FATTR4_WORD1_TIME_METADATA
 199         | FATTR4_WORD1_TIME_MODIFY
 200         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 201 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 202         FATTR4_WORD2_SECURITY_LABEL
 203 #endif
 204 };
 205
 206 static const u32 nfs4_pnfs_open_bitmap[3] = {
 207         FATTR4_WORD0_TYPE
 208         | FATTR4_WORD0_CHANGE
 209         | FATTR4_WORD0_SIZE
 210         | FATTR4_WORD0_FSID
 211         | FATTR4_WORD0_FILEID,
 212         FATTR4_WORD1_MODE
 213         | FATTR4_WORD1_NUMLINKS
 214         | FATTR4_WORD1_OWNER
 215         | FATTR4_WORD1_OWNER_GROUP
 216         | FATTR4_WORD1_RAWDEV
 217         | FATTR4_WORD1_SPACE_USED
 218         | FATTR4_WORD1_TIME_ACCESS
 219         | FATTR4_WORD1_TIME_METADATA
 220         | FATTR4_WORD1_TIME_MODIFY,
 221         FATTR4_WORD2_MDSTHRESHOLD
 222 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 223         | FATTR4_WORD2_SECURITY_LABEL
 224 #endif
 225 };
 226
 227 static const u32 nfs4_open_noattr_bitmap[3] = {
 228         FATTR4_WORD0_TYPE
 229         | FATTR4_WORD0_CHANGE
 230         | FATTR4_WORD0_FILEID,
 231 };
 232
 233 const u32 nfs4_statfs_bitmap[3] = {
 234         FATTR4_WORD0_FILES_AVAIL
 235         | FATTR4_WORD0_FILES_FREE
 236         | FATTR4_WORD0_FILES_TOTAL,
 237         FATTR4_WORD1_SPACE_AVAIL
 238         | FATTR4_WORD1_SPACE_FREE
 239         | FATTR4_WORD1_SPACE_TOTAL
 240 };
 241
 242 const u32 nfs4_pathconf_bitmap[3] = {
 243         FATTR4_WORD0_MAXLINK
 244         | FATTR4_WORD0_MAXNAME,
 245         0
 246 };
 247
 248 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 249                         | FATTR4_WORD0_MAXREAD
 250                         | FATTR4_WORD0_MAXWRITE
 251                         | FATTR4_WORD0_LEASE_TIME,
 252                         FATTR4_WORD1_TIME_DELTA
 253                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 254                         FATTR4_WORD2_LAYOUT_BLKSIZE
 255                         | FATTR4_WORD2_CLONE_BLKSIZE
 256 };
 257
 258 const u32 nfs4_fs_locations_bitmap[3] = {
 259         FATTR4_WORD0_TYPE
 260         | FATTR4_WORD0_CHANGE
 261         | FATTR4_WORD0_SIZE
 262         | FATTR4_WORD0_FSID
 263         | FATTR4_WORD0_FILEID
 264         | FATTR4_WORD0_FS_LOCATIONS,
 265         FATTR4_WORD1_MODE
 266         | FATTR4_WORD1_NUMLINKS
 267         | FATTR4_WORD1_OWNER
 268         | FATTR4_WORD1_OWNER_GROUP
 269         | FATTR4_WORD1_RAWDEV
 270         | FATTR4_WORD1_SPACE_USED
 271         | FATTR4_WORD1_TIME_ACCESS
 272         | FATTR4_WORD1_TIME_METADATA
 273         | FATTR4_WORD1_TIME_MODIFY
 274         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 275 };
 276
 277 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 278                 struct nfs4_readdir_arg *readdir)
 279 {
 280         __be32 *start, *p;
 281
 282         if (cookie > 2) {
 283                 readdir->cookie = cookie;
 284                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 285                 return;
 286         }
 287
 288         readdir->cookie = 0;
 289         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 290         if (cookie == 2)
 291                 return;
 292
 293         /*
 294          * NFSv4 servers do not return entries for '.' and '..'
 295          * Therefore, we fake these entries here.  We let '.'
 296          * have cookie 0 and '..' have cookie 1.  Note that
 297          * when talking to the server, we always send cookie 0
 298          * instead of 1 or 2.
 299          */
 300         start = p = kmap_atomic(*readdir->pages);
 301
 302         if (cookie == 0) {
 303                 *p++ = xdr_one;                                  /* next */
 304                 *p++ = xdr_zero;                   /* cookie, first word */
 305                 *p++ = xdr_one;                   /* cookie, second word */
 306                 *p++ = xdr_one;                             /* entry len */
 307                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 308                 p++;
 309                 *p++ = xdr_one;                         /* bitmap length */
 310                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 311                 *p++ = htonl(8);              /* attribute buffer length */
 312                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 313         }
 314
 315         *p++ = xdr_one;                                  /* next */
 316         *p++ = xdr_zero;                   /* cookie, first word */
 317         *p++ = xdr_two;                   /* cookie, second word */
 318         *p++ = xdr_two;                             /* entry len */
 319         memcpy(p, "..\0\0", 4);                         /* entry */
 320         p++;
 321         *p++ = xdr_one;                         /* bitmap length */
 322         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 323         *p++ = htonl(8);              /* attribute buffer length */
 324         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 325
 326         readdir->pgbase = (char *)p - (char *)start;
 327         readdir->count -= readdir->pgbase;
 328         kunmap_atomic(start);
 329 }
 330
 331 static long nfs4_update_delay(long *timeout)
 332 {
 333         long ret;
 334         if (!timeout)
 335                 return NFS4_POLL_RETRY_MAX;
 336         if (*timeout <= 0)
 337                 *timeout = NFS4_POLL_RETRY_MIN;
 338         if (*timeout > NFS4_POLL_RETRY_MAX)
 339                 *timeout = NFS4_POLL_RETRY_MAX;
 340         ret = *timeout;
 341         *timeout <<= 1;
 342         return ret;
 343 }
 344
 345 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 346 {
 347         int res = 0;
 348
 349         might_sleep();
 350
 351         freezable_schedule_timeout_killable_unsafe(
 352                 nfs4_update_delay(timeout));
 353         if (fatal_signal_pending(current))
 354                 res = -ERESTARTSYS;
 355         return res;
 356 }
 357
 358 /* This is the error handling routine for processes that are allowed
 359  * to sleep.
 360  */
 361 static int nfs4_do_handle_exception(struct nfs_server *server,
 362                 int errorcode, struct nfs4_exception *exception)
 363 {
 364         struct nfs_client *clp = server->nfs_client;
 365         struct nfs4_state *state = exception->state;
 366         const nfs4_stateid *stateid = exception->stateid;
 367         struct inode *inode = exception->inode;
 368         int ret = errorcode;
 369
 370         exception->delay = 0;
 371         exception->recovering = 0;
 372         exception->retry = 0;
 373         switch(errorcode) {
 374                 case 0:
 375                         return 0;
 376                 case -NFS4ERR_OPENMODE:
 377                 case -NFS4ERR_DELEG_REVOKED:
 378                 case -NFS4ERR_ADMIN_REVOKED:
 379                 case -NFS4ERR_BAD_STATEID:
 380                         if (inode) {
 381                                 int err;
 382
 383                                 err = nfs_async_inode_return_delegation(inode,
 384                                                 stateid);
 385                                 if (err == 0)
 386                                         goto wait_on_recovery;
 387                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 388                                         exception->retry = 1;
 389                                         break;
 390                                 }
 391                         }
 392                         if (state == NULL)
 393                                 break;
 394                         ret = nfs4_schedule_stateid_recovery(server, state);
 395                         if (ret < 0)
 396                                 break;
 397                         goto wait_on_recovery;
 398                 case -NFS4ERR_EXPIRED:
 399                         if (state != NULL) {
 400                                 ret = nfs4_schedule_stateid_recovery(server, state);
 401                                 if (ret < 0)
 402                                         break;
 403                         }
 404                 case -NFS4ERR_STALE_STATEID:
 405                 case -NFS4ERR_STALE_CLIENTID:
 406                         nfs4_schedule_lease_recovery(clp);
 407                         goto wait_on_recovery;
 408                 case -NFS4ERR_MOVED:
 409                         ret = nfs4_schedule_migration_recovery(server);
 410                         if (ret < 0)
 411                                 break;
 412                         goto wait_on_recovery;
 413                 case -NFS4ERR_LEASE_MOVED:
 414                         nfs4_schedule_lease_moved_recovery(clp);
 415                         goto wait_on_recovery;
 416 #if defined(CONFIG_NFS_V4_1)
 417                 case -NFS4ERR_BADSESSION:
 418                 case -NFS4ERR_BADSLOT:
 419                 case -NFS4ERR_BAD_HIGH_SLOT:
 420                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 421                 case -NFS4ERR_DEADSESSION:
 422                 case -NFS4ERR_SEQ_FALSE_RETRY:
 423                 case -NFS4ERR_SEQ_MISORDERED:
 424                         dprintk("%s ERROR: %d Reset session\n", __func__,
 425                                 errorcode);
 426                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 427                         goto wait_on_recovery;
 428 #endif /* defined(CONFIG_NFS_V4_1) */
 429                 case -NFS4ERR_FILE_OPEN:
 430                         if (exception->timeout > HZ) {
 431                                 /* We have retried a decent amount, time to
 432                                  * fail
 433                                  */
 434                                 ret = -EBUSY;
 435                                 break;
 436                         }
 437                 case -NFS4ERR_DELAY:
 438                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 439                 case -NFS4ERR_GRACE:
 440                 case -NFS4ERR_LAYOUTTRYLATER:
 441                 case -NFS4ERR_RECALLCONFLICT:
 442                         exception->delay = 1;
 443                         return 0;
 444
 445                 case -NFS4ERR_RETRY_UNCACHED_REP:
 446                 case -NFS4ERR_OLD_STATEID:
 447                         exception->retry = 1;
 448                         break;
 449                 case -NFS4ERR_BADOWNER:
 450                         /* The following works around a Linux server bug! */
 451                 case -NFS4ERR_BADNAME:
 452                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 453                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 454                                 exception->retry = 1;
 455                                 printk(KERN_WARNING "NFS: v4 server %s "
 456                                                 "does not accept raw "
 457                                                 "uid/gids. "
 458                                                 "Reenabling the idmapper.\n",
 459                                                 server->nfs_client->cl_hostname);
 460                         }
 461         }
 462         /* We failed to handle the error */
 463         return nfs4_map_errors(ret);
 464 wait_on_recovery:
 465         exception->recovering = 1;
 466         return 0;
 467 }
 468
 469 /* This is the error handling routine for processes that are allowed
 470  * to sleep.
 471  */
 472 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 473 {
 474         struct nfs_client *clp = server->nfs_client;
 475         int ret;
 476
 477         ret = nfs4_do_handle_exception(server, errorcode, exception);
 478         if (exception->delay) {
 479                 ret = nfs4_delay(server->client, &exception->timeout);
 480                 goto out_retry;
 481         }
 482         if (exception->recovering) {
 483                 ret = nfs4_wait_clnt_recover(clp);
 484                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 485                         return -EIO;
 486                 goto out_retry;
 487         }
 488         return ret;
 489 out_retry:
 490         if (ret == 0)
 491                 exception->retry = 1;
 492         return ret;
 493 }
 494
 495 static int
 496 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 497                 int errorcode, struct nfs4_exception *exception)
 498 {
 499         struct nfs_client *clp = server->nfs_client;
 500         int ret;
 501
 502         ret = nfs4_do_handle_exception(server, errorcode, exception);
 503         if (exception->delay) {
 504                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 505                 goto out_retry;
 506         }
 507         if (exception->recovering) {
 508                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 509                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 510                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 511                 goto out_retry;
 512         }
 513         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 514                 ret = -EIO;
 515         return ret;
 516 out_retry:
 517         if (ret == 0)
 518                 exception->retry = 1;
 519         return ret;
 520 }
 521
 522 static int
 523 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 524                         struct nfs4_state *state, long *timeout)
 525 {
 526         struct nfs4_exception exception = {
 527                 .state = state,
 528         };
 529
 530         if (task->tk_status >= 0)
 531                 return 0;
 532         if (timeout)
 533                 exception.timeout = *timeout;
 534         task->tk_status = nfs4_async_handle_exception(task, server,
 535                         task->tk_status,
 536                         &exception);
 537         if (exception.delay && timeout)
 538                 *timeout = exception.timeout;
 539         if (exception.retry)
 540                 return -EAGAIN;
 541         return 0;
 542 }
 543
 544 /*
 545  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 546  * or 'false' otherwise.
 547  */
 548 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 549 {
 550         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 551
 552         if (flavor == RPC_AUTH_GSS_KRB5I ||
 553             flavor == RPC_AUTH_GSS_KRB5P)
 554                 return true;
 555
 556         return false;
 557 }
 558
 559 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 560 {
 561         spin_lock(&clp->cl_lock);
 562         if (time_before(clp->cl_last_renewal,timestamp))
 563                 clp->cl_last_renewal = timestamp;
 564         spin_unlock(&clp->cl_lock);
 565 }
 566
 567 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 568 {
 569         struct nfs_client *clp = server->nfs_client;
 570
 571         if (!nfs4_has_session(clp))
 572                 do_renew_lease(clp, timestamp);
 573 }
 574
 575 struct nfs4_call_sync_data {
 576         const struct nfs_server *seq_server;
 577         struct nfs4_sequence_args *seq_args;
 578         struct nfs4_sequence_res *seq_res;
 579 };
 580
 581 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 582                         struct nfs4_sequence_res *res, int cache_reply)
 583 {
 584         args->sa_slot = NULL;
 585         args->sa_cache_this = cache_reply;
 586         args->sa_privileged = 0;
 587
 588         res->sr_slot = NULL;
 589 }
 590
 591 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 592 {
 593         args->sa_privileged = 1;
 594 }
 595
 596 int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 597                          struct nfs4_sequence_args *args,
 598                          struct nfs4_sequence_res *res,
 599                          struct rpc_task *task)
 600 {
 601         struct nfs4_slot *slot;
 602
 603         /* slot already allocated? */
 604         if (res->sr_slot != NULL)
 605                 goto out_start;
 606
 607         spin_lock(&tbl->slot_tbl_lock);
 608         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 609                 goto out_sleep;
 610
 611         slot = nfs4_alloc_slot(tbl);
 612         if (IS_ERR(slot)) {
 613                 if (slot == ERR_PTR(-ENOMEM))
 614                         task->tk_timeout = HZ >> 2;
 615                 goto out_sleep;
 616         }
 617         spin_unlock(&tbl->slot_tbl_lock);
 618
 619         args->sa_slot = slot;
 620         res->sr_slot = slot;
 621
 622 out_start:
 623         rpc_call_start(task);
 624         return 0;
 625
 626 out_sleep:
 627         if (args->sa_privileged)
 628                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 629                                 NULL, RPC_PRIORITY_PRIVILEGED);
 630         else
 631                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 632         spin_unlock(&tbl->slot_tbl_lock);
 633         return -EAGAIN;
 634 }
 635 EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
 636
 637 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 638 {
 639         struct nfs4_slot *slot = res->sr_slot;
 640         struct nfs4_slot_table *tbl;
 641
 642         tbl = slot->table;
 643         spin_lock(&tbl->slot_tbl_lock);
 644         if (!nfs41_wake_and_assign_slot(tbl, slot))
 645                 nfs4_free_slot(tbl, slot);
 646         spin_unlock(&tbl->slot_tbl_lock);
 647
 648         res->sr_slot = NULL;
 649 }
 650
 651 static int nfs40_sequence_done(struct rpc_task *task,
 652                                struct nfs4_sequence_res *res)
 653 {
 654         if (res->sr_slot != NULL)
 655                 nfs40_sequence_free_slot(res);
 656         return 1;
 657 }
 658
 659 #if defined(CONFIG_NFS_V4_1)
 660
 661 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 662 {
 663         struct nfs4_session *session;
 664         struct nfs4_slot_table *tbl;
 665         struct nfs4_slot *slot = res->sr_slot;
 666         bool send_new_highest_used_slotid = false;
 667
 668         tbl = slot->table;
 669         session = tbl->session;
 670
 671         /* Bump the slot sequence number */
 672         if (slot->seq_done)
 673                 slot->seq_nr++;
 674         slot->seq_done = 0;
 675
 676         spin_lock(&tbl->slot_tbl_lock);
 677         /* Be nice to the server: try to ensure that the last transmitted
 678          * value for highest_user_slotid <= target_highest_slotid
 679          */
 680         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 681                 send_new_highest_used_slotid = true;
 682
 683         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 684                 send_new_highest_used_slotid = false;
 685                 goto out_unlock;
 686         }
 687         nfs4_free_slot(tbl, slot);
 688
 689         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 690                 send_new_highest_used_slotid = false;
 691 out_unlock:
 692         spin_unlock(&tbl->slot_tbl_lock);
 693         res->sr_slot = NULL;
 694         if (send_new_highest_used_slotid)
 695                 nfs41_notify_server(session->clp);
 696         if (waitqueue_active(&tbl->slot_waitq))
 697                 wake_up_all(&tbl->slot_waitq);
 698 }
 699
 700 static int nfs41_sequence_process(struct rpc_task *task,
 701                 struct nfs4_sequence_res *res)
 702 {
 703         struct nfs4_session *session;
 704         struct nfs4_slot *slot = res->sr_slot;
 705         struct nfs_client *clp;
 706         bool interrupted = false;
 707         int ret = 1;
 708
 709         if (slot == NULL)
 710                 goto out_noaction;
 711         /* don't increment the sequence number if the task wasn't sent */
 712         if (!RPC_WAS_SENT(task))
 713                 goto out;
 714
 715         session = slot->table->session;
 716
 717         if (slot->interrupted) {
 718                 slot->interrupted = 0;
 719                 interrupted = true;
 720         }
 721
 722         trace_nfs4_sequence_done(session, res);
 723         /* Check the SEQUENCE operation status */
 724         switch (res->sr_status) {
 725         case 0:
 726                 /* Update the slot's sequence and clientid lease timer */
 727                 slot->seq_done = 1;
 728                 clp = session->clp;
 729                 do_renew_lease(clp, res->sr_timestamp);
 730                 /* Check sequence flags */
 731                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 732                 nfs41_update_target_slotid(slot->table, slot, res);
 733                 break;
 734         case 1:
 735                 /*
 736                  * sr_status remains 1 if an RPC level error occurred.
 737                  * The server may or may not have processed the sequence
 738                  * operation..
 739                  * Mark the slot as having hosted an interrupted RPC call.
 740                  */
 741                 slot->interrupted = 1;
 742                 goto out;
 743         case -NFS4ERR_DELAY:
 744                 /* The server detected a resend of the RPC call and
 745                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 746                  * of RFC5661.
 747                  */
 748                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 749                         __func__,
 750                         slot->slot_nr,
 751                         slot->seq_nr);
 752                 goto out_retry;
 753         case -NFS4ERR_BADSLOT:
 754                 /*
 755                  * The slot id we used was probably retired. Try again
 756                  * using a different slot id.
 757                  */
 758                 goto retry_nowait;
 759         case -NFS4ERR_SEQ_MISORDERED:
 760                 /*
 761                  * Was the last operation on this sequence interrupted?
 762                  * If so, retry after bumping the sequence number.
 763                  */
 764                 if (interrupted) {
 765                         ++slot->seq_nr;
 766                         goto retry_nowait;
 767                 }
 768                 /*
 769                  * Could this slot have been previously retired?
 770                  * If so, then the server may be expecting seq_nr = 1!
 771                  */
 772                 if (slot->seq_nr != 1) {
 773                         slot->seq_nr = 1;
 774                         goto retry_nowait;
 775                 }
 776                 break;
 777         case -NFS4ERR_SEQ_FALSE_RETRY:
 778                 ++slot->seq_nr;
 779                 goto retry_nowait;
 780         default:
 781                 /* Just update the slot sequence no. */
 782                 slot->seq_done = 1;
 783         }
 784 out:
 785         /* The session may be reset by one of the error handlers. */
 786         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 787 out_noaction:
 788         return ret;
 789 retry_nowait:
 790         if (rpc_restart_call_prepare(task)) {
 791                 nfs41_sequence_free_slot(res);
 792                 task->tk_status = 0;
 793                 ret = 0;
 794         }
 795         goto out;
 796 out_retry:
 797         if (!rpc_restart_call(task))
 798                 goto out;
 799         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 800         return 0;
 801 }
 802
 803 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 804 {
 805         if (!nfs41_sequence_process(task, res))
 806                 return 0;
 807         if (res->sr_slot != NULL)
 808                 nfs41_sequence_free_slot(res);
 809         return 1;
 810
 811 }
 812 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 813
 814 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 815 {
 816         if (res->sr_slot == NULL)
 817                 return 1;
 818         if (res->sr_slot->table->session != NULL)
 819                 return nfs41_sequence_process(task, res);
 820         return nfs40_sequence_done(task, res);
 821 }
 822
 823 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 824 {
 825         if (res->sr_slot != NULL) {
 826                 if (res->sr_slot->table->session != NULL)
 827                         nfs41_sequence_free_slot(res);
 828                 else
 829                         nfs40_sequence_free_slot(res);
 830         }
 831 }
 832
 833 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 834 {
 835         if (res->sr_slot == NULL)
 836                 return 1;
 837         if (!res->sr_slot->table->session)
 838                 return nfs40_sequence_done(task, res);
 839         return nfs41_sequence_done(task, res);
 840 }
 841 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 842
 843 int nfs41_setup_sequence(struct nfs4_session *session,
 844                                 struct nfs4_sequence_args *args,
 845                                 struct nfs4_sequence_res *res,
 846                                 struct rpc_task *task)
 847 {
 848         struct nfs4_slot *slot;
 849         struct nfs4_slot_table *tbl;
 850
 851         dprintk("--> %s\n", __func__);
 852         /* slot already allocated? */
 853         if (res->sr_slot != NULL)
 854                 goto out_success;
 855
 856         tbl = &session->fc_slot_table;
 857
 858         task->tk_timeout = 0;
 859
 860         spin_lock(&tbl->slot_tbl_lock);
 861         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 862             !args->sa_privileged) {
 863                 /* The state manager will wait until the slot table is empty */
 864                 dprintk("%s session is draining\n", __func__);
 865                 goto out_sleep;
 866         }
 867
 868         slot = nfs4_alloc_slot(tbl);
 869         if (IS_ERR(slot)) {
 870                 /* If out of memory, try again in 1/4 second */
 871                 if (slot == ERR_PTR(-ENOMEM))
 872                         task->tk_timeout = HZ >> 2;
 873                 dprintk("<-- %s: no free slots\n", __func__);
 874                 goto out_sleep;
 875         }
 876         spin_unlock(&tbl->slot_tbl_lock);
 877
 878         args->sa_slot = slot;
 879
 880         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 881                         slot->slot_nr, slot->seq_nr);
 882
 883         res->sr_slot = slot;
 884         res->sr_timestamp = jiffies;
 885         res->sr_status_flags = 0;
 886         /*
 887          * sr_status is only set in decode_sequence, and so will remain
 888          * set to 1 if an rpc level failure occurs.
 889          */
 890         res->sr_status = 1;
 891         trace_nfs4_setup_sequence(session, args);
 892 out_success:
 893         rpc_call_start(task);
 894         return 0;
 895 out_sleep:
 896         /* Privileged tasks are queued with top priority */
 897         if (args->sa_privileged)
 898                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 899                                 NULL, RPC_PRIORITY_PRIVILEGED);
 900         else
 901                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 902         spin_unlock(&tbl->slot_tbl_lock);
 903         return -EAGAIN;
 904 }
 905 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 906
 907 static int nfs4_setup_sequence(const struct nfs_server *server,
 908                                struct nfs4_sequence_args *args,
 909                                struct nfs4_sequence_res *res,
 910                                struct rpc_task *task)
 911 {
 912         struct nfs4_session *session = nfs4_get_session(server);
 913         int ret = 0;
 914
 915         if (!session)
 916                 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 917                                             args, res, task);
 918
 919         dprintk("--> %s clp %p session %p sr_slot %u\n",
 920                 __func__, session->clp, session, res->sr_slot ?
 921                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 922
 923         ret = nfs41_setup_sequence(session, args, res, task);
 924
 925         dprintk("<-- %s status=%d\n", __func__, ret);
 926         return ret;
 927 }
 928
 929 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 930 {
 931         struct nfs4_call_sync_data *data = calldata;
 932         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 933
 934         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 935
 936         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 937 }
 938
 939 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 940 {
 941         struct nfs4_call_sync_data *data = calldata;
 942
 943         nfs41_sequence_done(task, data->seq_res);
 944 }
 945
 946 static const struct rpc_call_ops nfs41_call_sync_ops = {
 947         .rpc_call_prepare = nfs41_call_sync_prepare,
 948         .rpc_call_done = nfs41_call_sync_done,
 949 };
 950
 951 #else   /* !CONFIG_NFS_V4_1 */
 952
 953 static int nfs4_setup_sequence(const struct nfs_server *server,
 954                                struct nfs4_sequence_args *args,
 955                                struct nfs4_sequence_res *res,
 956                                struct rpc_task *task)
 957 {
 958         return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 959                                     args, res, task);
 960 }
 961
 962 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 963 {
 964         return nfs40_sequence_done(task, res);
 965 }
 966
 967 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 968 {
 969         if (res->sr_slot != NULL)
 970                 nfs40_sequence_free_slot(res);
 971 }
 972
 973 int nfs4_sequence_done(struct rpc_task *task,
 974                        struct nfs4_sequence_res *res)
 975 {
 976         return nfs40_sequence_done(task, res);
 977 }
 978 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 979
 980 #endif  /* !CONFIG_NFS_V4_1 */
 981
 982 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 983 {
 984         struct nfs4_call_sync_data *data = calldata;
 985         nfs4_setup_sequence(data->seq_server,
 986                                 data->seq_args, data->seq_res, task);
 987 }
 988
 989 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 990 {
 991         struct nfs4_call_sync_data *data = calldata;
 992         nfs4_sequence_done(task, data->seq_res);
 993 }
 994
 995 static const struct rpc_call_ops nfs40_call_sync_ops = {
 996         .rpc_call_prepare = nfs40_call_sync_prepare,
 997         .rpc_call_done = nfs40_call_sync_done,
 998 };
 999
1000 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1001                                    struct nfs_server *server,
1002                                    struct rpc_message *msg,
1003                                    struct nfs4_sequence_args *args,
1004                                    struct nfs4_sequence_res *res)
1005 {
1006         int ret;
1007         struct rpc_task *task;
1008         struct nfs_client *clp = server->nfs_client;
1009         struct nfs4_call_sync_data data = {
1010                 .seq_server = server,
1011                 .seq_args = args,
1012                 .seq_res = res,
1013         };
1014         struct rpc_task_setup task_setup = {
1015                 .rpc_client = clnt,
1016                 .rpc_message = msg,
1017                 .callback_ops = clp->cl_mvops->call_sync_ops,
1018                 .callback_data = &data
1019         };
1020
1021         task = rpc_run_task(&task_setup);
1022         if (IS_ERR(task))
1023                 ret = PTR_ERR(task);
1024         else {
1025                 ret = task->tk_status;
1026                 rpc_put_task(task);
1027         }
1028         return ret;
1029 }
1030
1031 int nfs4_call_sync(struct rpc_clnt *clnt,
1032                    struct nfs_server *server,
1033                    struct rpc_message *msg,
1034                    struct nfs4_sequence_args *args,
1035                    struct nfs4_sequence_res *res,
1036                    int cache_reply)
1037 {
1038         nfs4_init_sequence(args, res, cache_reply);
1039         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1040 }
1041
1042 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
1043 {
1044         struct nfs_inode *nfsi = NFS_I(dir);
1045
1046         spin_lock(&dir->i_lock);
1047         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1048         if (!cinfo->atomic || cinfo->before != dir->i_version)
1049                 nfs_force_lookup_revalidate(dir);
1050         dir->i_version = cinfo->after;
1051         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1052         nfs_fscache_invalidate(dir);
1053         spin_unlock(&dir->i_lock);
1054 }
1055
1056 struct nfs4_opendata {
1057         struct kref kref;
1058         struct nfs_openargs o_arg;
1059         struct nfs_openres o_res;
1060         struct nfs_open_confirmargs c_arg;
1061         struct nfs_open_confirmres c_res;
1062         struct nfs4_string owner_name;
1063         struct nfs4_string group_name;
1064         struct nfs4_label *a_label;
1065         struct nfs_fattr f_attr;
1066         struct nfs4_label *f_label;
1067         struct dentry *dir;
1068         struct dentry *dentry;
1069         struct nfs4_state_owner *owner;
1070         struct nfs4_state *state;
1071         struct iattr attrs;
1072         unsigned long timestamp;
1073         unsigned int rpc_done : 1;
1074         unsigned int file_created : 1;
1075         unsigned int is_recover : 1;
1076         int rpc_status;
1077         int cancelled;
1078 };
1079
1080 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1081                 int err, struct nfs4_exception *exception)
1082 {
1083         if (err != -EINVAL)
1084                 return false;
1085         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1086                 return false;
1087         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1088         exception->retry = 1;
1089         return true;
1090 }
1091
1092 static u32
1093 nfs4_map_atomic_open_share(struct nfs_server *server,
1094                 fmode_t fmode, int openflags)
1095 {
1096         u32 res = 0;
1097
1098         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1099         case FMODE_READ:
1100                 res = NFS4_SHARE_ACCESS_READ;
1101                 break;
1102         case FMODE_WRITE:
1103                 res = NFS4_SHARE_ACCESS_WRITE;
1104                 break;
1105         case FMODE_READ|FMODE_WRITE:
1106                 res = NFS4_SHARE_ACCESS_BOTH;
1107         }
1108         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1109                 goto out;
1110         /* Want no delegation if we're using O_DIRECT */
1111         if (openflags & O_DIRECT)
1112                 res |= NFS4_SHARE_WANT_NO_DELEG;
1113 out:
1114         return res;
1115 }
1116
1117 static enum open_claim_type4
1118 nfs4_map_atomic_open_claim(struct nfs_server *server,
1119                 enum open_claim_type4 claim)
1120 {
1121         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1122                 return claim;
1123         switch (claim) {
1124         default:
1125                 return claim;
1126         case NFS4_OPEN_CLAIM_FH:
1127                 return NFS4_OPEN_CLAIM_NULL;
1128         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1129                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1130         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1131                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1132         }
1133 }
1134
1135 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1136 {
1137         p->o_res.f_attr = &p->f_attr;
1138         p->o_res.f_label = p->f_label;
1139         p->o_res.seqid = p->o_arg.seqid;
1140         p->c_res.seqid = p->c_arg.seqid;
1141         p->o_res.server = p->o_arg.server;
1142         p->o_res.access_request = p->o_arg.access;
1143         nfs_fattr_init(&p->f_attr);
1144         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1145 }
1146
1147 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1148                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1149                 const struct iattr *attrs,
1150                 struct nfs4_label *label,
1151                 enum open_claim_type4 claim,
1152                 gfp_t gfp_mask)
1153 {
1154         struct dentry *parent = dget_parent(dentry);
1155         struct inode *dir = d_inode(parent);
1156         struct nfs_server *server = NFS_SERVER(dir);
1157         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1158         struct nfs4_opendata *p;
1159
1160         p = kzalloc(sizeof(*p), gfp_mask);
1161         if (p == NULL)
1162                 goto err;
1163
1164         p->f_label = nfs4_label_alloc(server, gfp_mask);
1165         if (IS_ERR(p->f_label))
1166                 goto err_free_p;
1167
1168         p->a_label = nfs4_label_alloc(server, gfp_mask);
1169         if (IS_ERR(p->a_label))
1170                 goto err_free_f;
1171
1172         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1173         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1174         if (IS_ERR(p->o_arg.seqid))
1175                 goto err_free_label;
1176         nfs_sb_active(dentry->d_sb);
1177         p->dentry = dget(dentry);
1178         p->dir = parent;
1179         p->owner = sp;
1180         atomic_inc(&sp->so_count);
1181         p->o_arg.open_flags = flags;
1182         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1183         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1184                         fmode, flags);
1185         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1186          * will return permission denied for all bits until close */
1187         if (!(flags & O_EXCL)) {
1188                 /* ask server to check for all possible rights as results
1189                  * are cached */
1190                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1191                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1192         }
1193         p->o_arg.clientid = server->nfs_client->cl_clientid;
1194         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1195         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1196         p->o_arg.name = &dentry->d_name;
1197         p->o_arg.server = server;
1198         p->o_arg.bitmask = nfs4_bitmask(server, label);
1199         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1200         p->o_arg.label = nfs4_label_copy(p->a_label, label);
1201         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1202         switch (p->o_arg.claim) {
1203         case NFS4_OPEN_CLAIM_NULL:
1204         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1205         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1206                 p->o_arg.fh = NFS_FH(dir);
1207                 break;
1208         case NFS4_OPEN_CLAIM_PREVIOUS:
1209         case NFS4_OPEN_CLAIM_FH:
1210         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1211         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1212                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1213         }
1214         if (attrs != NULL && attrs->ia_valid != 0) {
1215                 __u32 verf[2];
1216
1217                 p->o_arg.u.attrs = &p->attrs;
1218                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1219
1220                 verf[0] = jiffies;
1221                 verf[1] = current->pid;
1222                 memcpy(p->o_arg.u.verifier.data, verf,
1223                                 sizeof(p->o_arg.u.verifier.data));
1224         }
1225         p->c_arg.fh = &p->o_res.fh;
1226         p->c_arg.stateid = &p->o_res.stateid;
1227         p->c_arg.seqid = p->o_arg.seqid;
1228         nfs4_init_opendata_res(p);
1229         kref_init(&p->kref);
1230         return p;
1231
1232 err_free_label:
1233         nfs4_label_free(p->a_label);
1234 err_free_f:
1235         nfs4_label_free(p->f_label);
1236 err_free_p:
1237         kfree(p);
1238 err:
1239         dput(parent);
1240         return NULL;
1241 }
1242
1243 static void nfs4_opendata_free(struct kref *kref)
1244 {
1245         struct nfs4_opendata *p = container_of(kref,
1246                         struct nfs4_opendata, kref);
1247         struct super_block *sb = p->dentry->d_sb;
1248
1249         nfs_free_seqid(p->o_arg.seqid);
1250         nfs4_sequence_free_slot(&p->o_res.seq_res);
1251         if (p->state != NULL)
1252                 nfs4_put_open_state(p->state);
1253         nfs4_put_state_owner(p->owner);
1254
1255         nfs4_label_free(p->a_label);
1256         nfs4_label_free(p->f_label);
1257
1258         dput(p->dir);
1259         dput(p->dentry);
1260         nfs_sb_deactive(sb);
1261         nfs_fattr_free_names(&p->f_attr);
1262         kfree(p->f_attr.mdsthreshold);
1263         kfree(p);
1264 }
1265
1266 static void nfs4_opendata_put(struct nfs4_opendata *p)
1267 {
1268         if (p != NULL)
1269                 kref_put(&p->kref, nfs4_opendata_free);
1270 }
1271
1272 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1273 {
1274         int ret;
1275
1276         ret = rpc_wait_for_completion_task(task);
1277         return ret;
1278 }
1279
1280 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1281                 fmode_t fmode)
1282 {
1283         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1284         case FMODE_READ|FMODE_WRITE:
1285                 return state->n_rdwr != 0;
1286         case FMODE_WRITE:
1287                 return state->n_wronly != 0;
1288         case FMODE_READ:
1289                 return state->n_rdonly != 0;
1290         }
1291         WARN_ON_ONCE(1);
1292         return false;
1293 }
1294
1295 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1296 {
1297         int ret = 0;
1298
1299         if (open_mode & (O_EXCL|O_TRUNC))
1300                 goto out;
1301         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1302                 case FMODE_READ:
1303                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1304                                 && state->n_rdonly != 0;
1305                         break;
1306                 case FMODE_WRITE:
1307                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1308                                 && state->n_wronly != 0;
1309                         break;
1310                 case FMODE_READ|FMODE_WRITE:
1311                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1312                                 && state->n_rdwr != 0;
1313         }
1314 out:
1315         return ret;
1316 }
1317
1318 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1319                 enum open_claim_type4 claim)
1320 {
1321         if (delegation == NULL)
1322                 return 0;
1323         if ((delegation->type & fmode) != fmode)
1324                 return 0;
1325         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1326                 return 0;
1327         switch (claim) {
1328         case NFS4_OPEN_CLAIM_NULL:
1329         case NFS4_OPEN_CLAIM_FH:
1330                 break;
1331         case NFS4_OPEN_CLAIM_PREVIOUS:
1332                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1333                         break;
1334         default:
1335                 return 0;
1336         }
1337         nfs_mark_delegation_referenced(delegation);
1338         return 1;
1339 }
1340
1341 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1342 {
1343         switch (fmode) {
1344                 case FMODE_WRITE:
1345                         state->n_wronly++;
1346                         break;
1347                 case FMODE_READ:
1348                         state->n_rdonly++;
1349                         break;
1350                 case FMODE_READ|FMODE_WRITE:
1351                         state->n_rdwr++;
1352         }
1353         nfs4_state_set_mode_locked(state, state->state | fmode);
1354 }
1355
1356 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1357 {
1358         struct nfs_client *clp = state->owner->so_server->nfs_client;
1359         bool need_recover = false;
1360
1361         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1362                 need_recover = true;
1363         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1364                 need_recover = true;
1365         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1366                 need_recover = true;
1367         if (need_recover)
1368                 nfs4_state_mark_reclaim_nograce(clp, state);
1369 }
1370
1371 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1372                 nfs4_stateid *stateid)
1373 {
1374         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1375                 return true;
1376         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1377                 nfs_test_and_clear_all_open_stateid(state);
1378                 return true;
1379         }
1380         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1381                 return true;
1382         return false;
1383 }
1384
1385 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1386 {
1387         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1388                 return;
1389         if (state->n_wronly)
1390                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1391         if (state->n_rdonly)
1392                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1393         if (state->n_rdwr)
1394                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1395         set_bit(NFS_OPEN_STATE, &state->flags);
1396 }
1397
1398 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1399                 nfs4_stateid *arg_stateid,
1400                 nfs4_stateid *stateid, fmode_t fmode)
1401 {
1402         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1403         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1404         case FMODE_WRITE:
1405                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1406                 break;
1407         case FMODE_READ:
1408                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1409                 break;
1410         case 0:
1411                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1412                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1413                 clear_bit(NFS_OPEN_STATE, &state->flags);
1414         }
1415         if (stateid == NULL)
1416                 return;
1417         /* Handle races with OPEN */
1418         if (!nfs4_stateid_match_other(arg_stateid, &state->open_stateid) ||
1419             (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1420             !nfs4_stateid_is_newer(stateid, &state->open_stateid))) {
1421                 nfs_resync_open_stateid_locked(state);
1422                 return;
1423         }
1424         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1425                 nfs4_stateid_copy(&state->stateid, stateid);
1426         nfs4_stateid_copy(&state->open_stateid, stateid);
1427 }
1428
1429 static void nfs_clear_open_stateid(struct nfs4_state *state,
1430         nfs4_stateid *arg_stateid,
1431         nfs4_stateid *stateid, fmode_t fmode)
1432 {
1433         write_seqlock(&state->seqlock);
1434         nfs_clear_open_stateid_locked(state, arg_stateid, stateid, fmode);
1435         write_sequnlock(&state->seqlock);
1436         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1437                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1438 }
1439
1440 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1441 {
1442         switch (fmode) {
1443                 case FMODE_READ:
1444                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1445                         break;
1446                 case FMODE_WRITE:
1447                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1448                         break;
1449                 case FMODE_READ|FMODE_WRITE:
1450                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1451         }
1452         if (!nfs_need_update_open_stateid(state, stateid))
1453                 return;
1454         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1455                 nfs4_stateid_copy(&state->stateid, stateid);
1456         nfs4_stateid_copy(&state->open_stateid, stateid);
1457 }
1458
1459 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1460 {
1461         /*
1462          * Protect the call to nfs4_state_set_mode_locked and
1463          * serialise the stateid update
1464          */
1465         spin_lock(&state->owner->so_lock);
1466         write_seqlock(&state->seqlock);
1467         if (deleg_stateid != NULL) {
1468                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1469                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1470         }
1471         if (open_stateid != NULL)
1472                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1473         write_sequnlock(&state->seqlock);
1474         update_open_stateflags(state, fmode);
1475         spin_unlock(&state->owner->so_lock);
1476 }
1477
1478 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1479 {
1480         struct nfs_inode *nfsi = NFS_I(state->inode);
1481         struct nfs_delegation *deleg_cur;
1482         int ret = 0;
1483
1484         fmode &= (FMODE_READ|FMODE_WRITE);
1485
1486         rcu_read_lock();
1487         deleg_cur = rcu_dereference(nfsi->delegation);
1488         if (deleg_cur == NULL)
1489                 goto no_delegation;
1490
1491         spin_lock(&deleg_cur->lock);
1492         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1493            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1494             (deleg_cur->type & fmode) != fmode)
1495                 goto no_delegation_unlock;
1496
1497         if (delegation == NULL)
1498                 delegation = &deleg_cur->stateid;
1499         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1500                 goto no_delegation_unlock;
1501
1502         nfs_mark_delegation_referenced(deleg_cur);
1503         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1504         ret = 1;
1505 no_delegation_unlock:
1506         spin_unlock(&deleg_cur->lock);
1507 no_delegation:
1508         rcu_read_unlock();
1509
1510         if (!ret && open_stateid != NULL) {
1511                 __update_open_stateid(state, open_stateid, NULL, fmode);
1512                 ret = 1;
1513         }
1514         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1515                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1516
1517         return ret;
1518 }
1519
1520 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1521                 const nfs4_stateid *stateid)
1522 {
1523         struct nfs4_state *state = lsp->ls_state;
1524         bool ret = false;
1525
1526         spin_lock(&state->state_lock);
1527         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1528                 goto out_noupdate;
1529         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1530                 goto out_noupdate;
1531         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1532         ret = true;
1533 out_noupdate:
1534         spin_unlock(&state->state_lock);
1535         return ret;
1536 }
1537
1538 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1539 {
1540         struct nfs_delegation *delegation;
1541
1542         rcu_read_lock();
1543         delegation = rcu_dereference(NFS_I(inode)->delegation);
1544         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1545                 rcu_read_unlock();
1546                 return;
1547         }
1548         rcu_read_unlock();
1549         nfs4_inode_return_delegation(inode);
1550 }
1551
1552 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1553 {
1554         struct nfs4_state *state = opendata->state;
1555         struct nfs_inode *nfsi = NFS_I(state->inode);
1556         struct nfs_delegation *delegation;
1557         int open_mode = opendata->o_arg.open_flags;
1558         fmode_t fmode = opendata->o_arg.fmode;
1559         enum open_claim_type4 claim = opendata->o_arg.claim;
1560         nfs4_stateid stateid;
1561         int ret = -EAGAIN;
1562
1563         for (;;) {
1564                 spin_lock(&state->owner->so_lock);
1565                 if (can_open_cached(state, fmode, open_mode)) {
1566                         update_open_stateflags(state, fmode);
1567                         spin_unlock(&state->owner->so_lock);
1568                         goto out_return_state;
1569                 }
1570                 spin_unlock(&state->owner->so_lock);
1571                 rcu_read_lock();
1572                 delegation = rcu_dereference(nfsi->delegation);
1573                 if (!can_open_delegated(delegation, fmode, claim)) {
1574                         rcu_read_unlock();
1575                         break;
1576                 }
1577                 /* Save the delegation */
1578                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1579                 rcu_read_unlock();
1580                 nfs_release_seqid(opendata->o_arg.seqid);
1581                 if (!opendata->is_recover) {
1582                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1583                         if (ret != 0)
1584                                 goto out;
1585                 }
1586                 ret = -EAGAIN;
1587
1588                 /* Try to update the stateid using the delegation */
1589                 if (update_open_stateid(state, NULL, &stateid, fmode))
1590                         goto out_return_state;
1591         }
1592 out:
1593         return ERR_PTR(ret);
1594 out_return_state:
1595         atomic_inc(&state->count);
1596         return state;
1597 }
1598
1599 static void
1600 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1601 {
1602         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1603         struct nfs_delegation *delegation;
1604         int delegation_flags = 0;
1605
1606         rcu_read_lock();
1607         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1608         if (delegation)
1609                 delegation_flags = delegation->flags;
1610         rcu_read_unlock();
1611         switch (data->o_arg.claim) {
1612         default:
1613                 break;
1614         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1615         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1616                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1617                                    "returning a delegation for "
1618                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1619                                    clp->cl_hostname);
1620                 return;
1621         }
1622         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1623                 nfs_inode_set_delegation(state->inode,
1624                                          data->owner->so_cred,
1625                                          &data->o_res);
1626         else
1627                 nfs_inode_reclaim_delegation(state->inode,
1628                                              data->owner->so_cred,
1629                                              &data->o_res);
1630 }
1631
1632 /*
1633  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1634  * and update the nfs4_state.
1635  */
1636 static struct nfs4_state *
1637 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1638 {
1639         struct inode *inode = data->state->inode;
1640         struct nfs4_state *state = data->state;
1641         int ret;
1642
1643         if (!data->rpc_done) {
1644                 if (data->rpc_status) {
1645                         ret = data->rpc_status;
1646                         goto err;
1647                 }
1648                 /* cached opens have already been processed */
1649                 goto update;
1650         }
1651
1652         ret = nfs_refresh_inode(inode, &data->f_attr);
1653         if (ret)
1654                 goto err;
1655
1656         if (data->o_res.delegation_type != 0)
1657                 nfs4_opendata_check_deleg(data, state);
1658 update:
1659         update_open_stateid(state, &data->o_res.stateid, NULL,
1660                             data->o_arg.fmode);
1661         atomic_inc(&state->count);
1662
1663         return state;
1664 err:
1665         return ERR_PTR(ret);
1666
1667 }
1668
1669 static struct nfs4_state *
1670 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1671 {
1672         struct inode *inode;
1673         struct nfs4_state *state = NULL;
1674         int ret;
1675
1676         if (!data->rpc_done) {
1677                 state = nfs4_try_open_cached(data);
1678                 trace_nfs4_cached_open(data->state);
1679                 goto out;
1680         }
1681
1682         ret = -EAGAIN;
1683         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1684                 goto err;
1685         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1686         ret = PTR_ERR(inode);
1687         if (IS_ERR(inode))
1688                 goto err;
1689         ret = -ENOMEM;
1690         state = nfs4_get_open_state(inode, data->owner);
1691         if (state == NULL)
1692                 goto err_put_inode;
1693         if (data->o_res.delegation_type != 0)
1694                 nfs4_opendata_check_deleg(data, state);
1695         update_open_stateid(state, &data->o_res.stateid, NULL,
1696                         data->o_arg.fmode);
1697         iput(inode);
1698 out:
1699         nfs_release_seqid(data->o_arg.seqid);
1700         return state;
1701 err_put_inode:
1702         iput(inode);
1703 err:
1704         return ERR_PTR(ret);
1705 }
1706
1707 static struct nfs4_state *
1708 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1709 {
1710         struct nfs4_state *ret;
1711
1712         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1713                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
1714         else
1715                 ret = _nfs4_opendata_to_nfs4_state(data);
1716         nfs4_sequence_free_slot(&data->o_res.seq_res);
1717         return ret;
1718 }
1719
1720 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1721 {
1722         struct nfs_inode *nfsi = NFS_I(state->inode);
1723         struct nfs_open_context *ctx;
1724
1725         spin_lock(&state->inode->i_lock);
1726         list_for_each_entry(ctx, &nfsi->open_files, list) {
1727                 if (ctx->state != state)
1728                         continue;
1729                 get_nfs_open_context(ctx);
1730                 spin_unlock(&state->inode->i_lock);
1731                 return ctx;
1732         }
1733         spin_unlock(&state->inode->i_lock);
1734         return ERR_PTR(-ENOENT);
1735 }
1736
1737 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1738                 struct nfs4_state *state, enum open_claim_type4 claim)
1739 {
1740         struct nfs4_opendata *opendata;
1741
1742         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1743                         NULL, NULL, claim, GFP_NOFS);
1744         if (opendata == NULL)
1745                 return ERR_PTR(-ENOMEM);
1746         opendata->state = state;
1747         atomic_inc(&state->count);
1748         return opendata;
1749 }
1750
1751 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
1752                 fmode_t fmode)
1753 {
1754         struct nfs4_state *newstate;
1755         int ret;
1756
1757         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
1758                 return 0;
1759         opendata->o_arg.open_flags = 0;
1760         opendata->o_arg.fmode = fmode;
1761         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1762                         NFS_SB(opendata->dentry->d_sb),
1763                         fmode, 0);
1764         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1765         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1766         nfs4_init_opendata_res(opendata);
1767         ret = _nfs4_recover_proc_open(opendata);
1768         if (ret != 0)
1769                 return ret;
1770         newstate = nfs4_opendata_to_nfs4_state(opendata);
1771         if (IS_ERR(newstate))
1772                 return PTR_ERR(newstate);
1773         if (newstate != opendata->state)
1774                 ret = -ESTALE;
1775         nfs4_close_state(newstate, fmode);
1776         return ret;
1777 }
1778
1779 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1780 {
1781         int ret;
1782
1783         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1784         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1785         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1786         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1787         /* memory barrier prior to reading state->n_* */
1788         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1789         clear_bit(NFS_OPEN_STATE, &state->flags);
1790         smp_rmb();
1791         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1792         if (ret != 0)
1793                 return ret;
1794         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1795         if (ret != 0)
1796                 return ret;
1797         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
1798         if (ret != 0)
1799                 return ret;
1800         /*
1801          * We may have performed cached opens for all three recoveries.
1802          * Check if we need to update the current stateid.
1803          */
1804         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1805             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1806                 write_seqlock(&state->seqlock);
1807                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1808                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1809                 write_sequnlock(&state->seqlock);
1810         }
1811         return 0;
1812 }
1813
1814 /*
1815  * OPEN_RECLAIM:
1816  *      reclaim state on the server after a reboot.
1817  */
1818 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1819 {
1820         struct nfs_delegation *delegation;
1821         struct nfs4_opendata *opendata;
1822         fmode_t delegation_type = 0;
1823         int status;
1824
1825         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1826                         NFS4_OPEN_CLAIM_PREVIOUS);
1827         if (IS_ERR(opendata))
1828                 return PTR_ERR(opendata);
1829         rcu_read_lock();
1830         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1831         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1832                 delegation_type = delegation->type;
1833         rcu_read_unlock();
1834         opendata->o_arg.u.delegation_type = delegation_type;
1835         status = nfs4_open_recover(opendata, state);
1836         nfs4_opendata_put(opendata);
1837         return status;
1838 }
1839
1840 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1841 {
1842         struct nfs_server *server = NFS_SERVER(state->inode);
1843         struct nfs4_exception exception = { };
1844         int err;
1845         do {
1846                 err = _nfs4_do_open_reclaim(ctx, state);
1847                 trace_nfs4_open_reclaim(ctx, 0, err);
1848                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1849                         continue;
1850                 if (err != -NFS4ERR_DELAY)
1851                         break;
1852                 nfs4_handle_exception(server, err, &exception);
1853         } while (exception.retry);
1854         return err;
1855 }
1856
1857 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1858 {
1859         struct nfs_open_context *ctx;
1860         int ret;
1861
1862         ctx = nfs4_state_find_open_context(state);
1863         if (IS_ERR(ctx))
1864                 return -EAGAIN;
1865         ret = nfs4_do_open_reclaim(ctx, state);
1866         put_nfs_open_context(ctx);
1867         return ret;
1868 }
1869
1870 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1871 {
1872         switch (err) {
1873                 default:
1874                         printk(KERN_ERR "NFS: %s: unhandled error "
1875                                         "%d.\n", __func__, err);
1876                 case 0:
1877                 case -ENOENT:
1878                 case -EAGAIN:
1879                 case -ESTALE:
1880                         break;
1881                 case -NFS4ERR_BADSESSION:
1882                 case -NFS4ERR_BADSLOT:
1883                 case -NFS4ERR_BAD_HIGH_SLOT:
1884                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1885                 case -NFS4ERR_DEADSESSION:
1886                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1887                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1888                         return -EAGAIN;
1889                 case -NFS4ERR_STALE_CLIENTID:
1890                 case -NFS4ERR_STALE_STATEID:
1891                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1892                 case -NFS4ERR_EXPIRED:
1893                         /* Don't recall a delegation if it was lost */
1894                         nfs4_schedule_lease_recovery(server->nfs_client);
1895                         return -EAGAIN;
1896                 case -NFS4ERR_MOVED:
1897                         nfs4_schedule_migration_recovery(server);
1898                         return -EAGAIN;
1899                 case -NFS4ERR_LEASE_MOVED:
1900                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1901                         return -EAGAIN;
1902                 case -NFS4ERR_DELEG_REVOKED:
1903                 case -NFS4ERR_ADMIN_REVOKED:
1904                 case -NFS4ERR_BAD_STATEID:
1905                 case -NFS4ERR_OPENMODE:
1906                         nfs_inode_find_state_and_recover(state->inode,
1907                                         stateid);
1908                         nfs4_schedule_stateid_recovery(server, state);
1909                         return -EAGAIN;
1910                 case -NFS4ERR_DELAY:
1911                 case -NFS4ERR_GRACE:
1912                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1913                         ssleep(1);
1914                         return -EAGAIN;
1915                 case -ENOMEM:
1916                 case -NFS4ERR_DENIED:
1917                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1918                         return 0;
1919         }
1920         return err;
1921 }
1922
1923 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
1924                 struct nfs4_state *state, const nfs4_stateid *stateid,
1925                 fmode_t type)
1926 {
1927         struct nfs_server *server = NFS_SERVER(state->inode);
1928         struct nfs4_opendata *opendata;
1929         int err = 0;
1930
1931         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1932                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1933         if (IS_ERR(opendata))
1934                 return PTR_ERR(opendata);
1935         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1936         write_seqlock(&state->seqlock);
1937         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1938         write_sequnlock(&state->seqlock);
1939         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1940         switch (type & (FMODE_READ|FMODE_WRITE)) {
1941         case FMODE_READ|FMODE_WRITE:
1942         case FMODE_WRITE:
1943                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1944                 if (err)
1945                         break;
1946                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1947                 if (err)
1948                         break;
1949         case FMODE_READ:
1950                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
1951         }
1952         nfs4_opendata_put(opendata);
1953         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1954 }
1955
1956 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1957 {
1958         struct nfs4_opendata *data = calldata;
1959
1960         nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
1961                              &data->c_arg.seq_args, &data->c_res.seq_res, task);
1962 }
1963
1964 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1965 {
1966         struct nfs4_opendata *data = calldata;
1967
1968         nfs40_sequence_done(task, &data->c_res.seq_res);
1969
1970         data->rpc_status = task->tk_status;
1971         if (data->rpc_status == 0) {
1972                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1973                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1974                 renew_lease(data->o_res.server, data->timestamp);
1975                 data->rpc_done = 1;
1976         }
1977 }
1978
1979 static void nfs4_open_confirm_release(void *calldata)
1980 {
1981         struct nfs4_opendata *data = calldata;
1982         struct nfs4_state *state = NULL;
1983
1984         /* If this request hasn't been cancelled, do nothing */
1985         if (data->cancelled == 0)
1986                 goto out_free;
1987         /* In case of error, no cleanup! */
1988         if (!data->rpc_done)
1989                 goto out_free;
1990         state = nfs4_opendata_to_nfs4_state(data);
1991         if (!IS_ERR(state))
1992                 nfs4_close_state(state, data->o_arg.fmode);
1993 out_free:
1994         nfs4_opendata_put(data);
1995 }
1996
1997 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1998         .rpc_call_prepare = nfs4_open_confirm_prepare,
1999         .rpc_call_done = nfs4_open_confirm_done,
2000         .rpc_release = nfs4_open_confirm_release,
2001 };
2002
2003 /*
2004  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2005  */
2006 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2007 {
2008         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2009         struct rpc_task *task;
2010         struct  rpc_message msg = {
2011                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2012                 .rpc_argp = &data->c_arg,
2013                 .rpc_resp = &data->c_res,
2014                 .rpc_cred = data->owner->so_cred,
2015         };
2016         struct rpc_task_setup task_setup_data = {
2017                 .rpc_client = server->client,
2018                 .rpc_message = &msg,
2019                 .callback_ops = &nfs4_open_confirm_ops,
2020                 .callback_data = data,
2021                 .workqueue = nfsiod_workqueue,
2022                 .flags = RPC_TASK_ASYNC,
2023         };
2024         int status;
2025
2026         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
2027         kref_get(&data->kref);
2028         data->rpc_done = 0;
2029         data->rpc_status = 0;
2030         data->timestamp = jiffies;
2031         if (data->is_recover)
2032                 nfs4_set_sequence_privileged(&data->c_arg.seq_args);
2033         task = rpc_run_task(&task_setup_data);
2034         if (IS_ERR(task))
2035                 return PTR_ERR(task);
2036         status = nfs4_wait_for_completion_rpc_task(task);
2037         if (status != 0) {
2038                 data->cancelled = 1;
2039                 smp_wmb();
2040         } else
2041                 status = data->rpc_status;
2042         rpc_put_task(task);
2043         return status;
2044 }
2045
2046 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2047 {
2048         struct nfs4_opendata *data = calldata;
2049         struct nfs4_state_owner *sp = data->owner;
2050         struct nfs_client *clp = sp->so_server->nfs_client;
2051         enum open_claim_type4 claim = data->o_arg.claim;
2052
2053         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2054                 goto out_wait;
2055         /*
2056          * Check if we still need to send an OPEN call, or if we can use
2057          * a delegation instead.
2058          */
2059         if (data->state != NULL) {
2060                 struct nfs_delegation *delegation;
2061
2062                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
2063                         goto out_no_action;
2064                 rcu_read_lock();
2065                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
2066                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2067                         goto unlock_no_action;
2068                 rcu_read_unlock();
2069         }
2070         /* Update client id. */
2071         data->o_arg.clientid = clp->cl_clientid;
2072         switch (claim) {
2073         default:
2074                 break;
2075         case NFS4_OPEN_CLAIM_PREVIOUS:
2076         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2077         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2078                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2079         case NFS4_OPEN_CLAIM_FH:
2080                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2081                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
2082         }
2083         data->timestamp = jiffies;
2084         if (nfs4_setup_sequence(data->o_arg.server,
2085                                 &data->o_arg.seq_args,
2086                                 &data->o_res.seq_res,
2087                                 task) != 0)
2088                 nfs_release_seqid(data->o_arg.seqid);
2089
2090         /* Set the create mode (note dependency on the session type) */
2091         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2092         if (data->o_arg.open_flags & O_EXCL) {
2093                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2094                 if (nfs4_has_persistent_session(clp))
2095                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2096                 else if (clp->cl_mvops->minor_version > 0)
2097                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2098         }
2099         return;
2100 unlock_no_action:
2101         trace_nfs4_cached_open(data->state);
2102         rcu_read_unlock();
2103 out_no_action:
2104         task->tk_action = NULL;
2105 out_wait:
2106         nfs4_sequence_done(task, &data->o_res.seq_res);
2107 }
2108
2109 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2110 {
2111         struct nfs4_opendata *data = calldata;
2112
2113         data->rpc_status = task->tk_status;
2114
2115         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2116                 return;
2117
2118         if (task->tk_status == 0) {
2119                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2120                         switch (data->o_res.f_attr->mode & S_IFMT) {
2121                         case S_IFREG:
2122                                 break;
2123                         case S_IFLNK:
2124                                 data->rpc_status = -ELOOP;
2125                                 break;
2126                         case S_IFDIR:
2127                                 data->rpc_status = -EISDIR;
2128                                 break;
2129                         default:
2130                                 data->rpc_status = -ENOTDIR;
2131                         }
2132                 }
2133                 renew_lease(data->o_res.server, data->timestamp);
2134                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2135                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2136         }
2137         data->rpc_done = 1;
2138 }
2139
2140 static void nfs4_open_release(void *calldata)
2141 {
2142         struct nfs4_opendata *data = calldata;
2143         struct nfs4_state *state = NULL;
2144
2145         /* If this request hasn't been cancelled, do nothing */
2146         if (data->cancelled == 0)
2147                 goto out_free;
2148         /* In case of error, no cleanup! */
2149         if (data->rpc_status != 0 || !data->rpc_done)
2150                 goto out_free;
2151         /* In case we need an open_confirm, no cleanup! */
2152         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2153                 goto out_free;
2154         state = nfs4_opendata_to_nfs4_state(data);
2155         if (!IS_ERR(state))
2156                 nfs4_close_state(state, data->o_arg.fmode);
2157 out_free:
2158         nfs4_opendata_put(data);
2159 }
2160
2161 static const struct rpc_call_ops nfs4_open_ops = {
2162         .rpc_call_prepare = nfs4_open_prepare,
2163         .rpc_call_done = nfs4_open_done,
2164         .rpc_release = nfs4_open_release,
2165 };
2166
2167 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
2168 {
2169         struct inode *dir = d_inode(data->dir);
2170         struct nfs_server *server = NFS_SERVER(dir);
2171         struct nfs_openargs *o_arg = &data->o_arg;
2172         struct nfs_openres *o_res = &data->o_res;
2173         struct rpc_task *task;
2174         struct rpc_message msg = {
2175                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2176                 .rpc_argp = o_arg,
2177                 .rpc_resp = o_res,
2178                 .rpc_cred = data->owner->so_cred,
2179         };
2180         struct rpc_task_setup task_setup_data = {
2181                 .rpc_client = server->client,
2182                 .rpc_message = &msg,
2183                 .callback_ops = &nfs4_open_ops,
2184                 .callback_data = data,
2185                 .workqueue = nfsiod_workqueue,
2186                 .flags = RPC_TASK_ASYNC,
2187         };
2188         int status;
2189
2190         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
2191         kref_get(&data->kref);
2192         data->rpc_done = 0;
2193         data->rpc_status = 0;
2194         data->cancelled = 0;
2195         data->is_recover = 0;
2196         if (isrecover) {
2197                 nfs4_set_sequence_privileged(&o_arg->seq_args);
2198                 data->is_recover = 1;
2199         }
2200         task = rpc_run_task(&task_setup_data);
2201         if (IS_ERR(task))
2202                 return PTR_ERR(task);
2203         status = nfs4_wait_for_completion_rpc_task(task);
2204         if (status != 0) {
2205                 data->cancelled = 1;
2206                 smp_wmb();
2207         } else
2208                 status = data->rpc_status;
2209         rpc_put_task(task);
2210
2211         return status;
2212 }
2213
2214 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2215 {
2216         struct inode *dir = d_inode(data->dir);
2217         struct nfs_openres *o_res = &data->o_res;
2218         int status;
2219
2220         status = nfs4_run_open_task(data, 1);
2221         if (status != 0 || !data->rpc_done)
2222                 return status;
2223
2224         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2225
2226         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2227                 status = _nfs4_proc_open_confirm(data);
2228                 if (status != 0)
2229                         return status;
2230         }
2231
2232         return status;
2233 }
2234
2235 /*
2236  * Additional permission checks in order to distinguish between an
2237  * open for read, and an open for execute. This works around the
2238  * fact that NFSv4 OPEN treats read and execute permissions as being
2239  * the same.
2240  * Note that in the non-execute case, we want to turn off permission
2241  * checking if we just created a new file (POSIX open() semantics).
2242  */
2243 static int nfs4_opendata_access(struct rpc_cred *cred,
2244                                 struct nfs4_opendata *opendata,
2245                                 struct nfs4_state *state, fmode_t fmode,
2246                                 int openflags)
2247 {
2248         struct nfs_access_entry cache;
2249         u32 mask;
2250
2251         /* access call failed or for some reason the server doesn't
2252          * support any access modes -- defer access call until later */
2253         if (opendata->o_res.access_supported == 0)
2254                 return 0;
2255
2256         mask = 0;
2257         /*
2258          * Use openflags to check for exec, because fmode won't
2259          * always have FMODE_EXEC set when file open for exec.
2260          */
2261         if (openflags & __FMODE_EXEC) {
2262                 /* ONLY check for exec rights */
2263                 mask = MAY_EXEC;
2264         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2265                 mask = MAY_READ;
2266
2267         cache.cred = cred;
2268         cache.jiffies = jiffies;
2269         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2270         nfs_access_add_cache(state->inode, &cache);
2271
2272         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2273                 return 0;
2274
2275         /* even though OPEN succeeded, access is denied. Close the file */
2276         nfs4_close_state(state, fmode);
2277         return -EACCES;
2278 }
2279
2280 /*
2281  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2282  */
2283 static int _nfs4_proc_open(struct nfs4_opendata *data)
2284 {
2285         struct inode *dir = d_inode(data->dir);
2286         struct nfs_server *server = NFS_SERVER(dir);
2287         struct nfs_openargs *o_arg = &data->o_arg;
2288         struct nfs_openres *o_res = &data->o_res;
2289         int status;
2290
2291         status = nfs4_run_open_task(data, 0);
2292         if (!data->rpc_done)
2293                 return status;
2294         if (status != 0) {
2295                 if (status == -NFS4ERR_BADNAME &&
2296                                 !(o_arg->open_flags & O_CREAT))
2297                         return -ENOENT;
2298                 return status;
2299         }
2300
2301         nfs_fattr_map_and_free_names(server, &data->f_attr);
2302
2303         if (o_arg->open_flags & O_CREAT) {
2304                 update_changeattr(dir, &o_res->cinfo);
2305                 if (o_arg->open_flags & O_EXCL)
2306                         data->file_created = 1;
2307                 else if (o_res->cinfo.before != o_res->cinfo.after)
2308                         data->file_created = 1;
2309         }
2310         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2311                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2312         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2313                 status = _nfs4_proc_open_confirm(data);
2314                 if (status != 0)
2315                         return status;
2316         }
2317         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2318                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2319         return 0;
2320 }
2321
2322 static int nfs4_recover_expired_lease(struct nfs_server *server)
2323 {
2324         return nfs4_client_recover_expired_lease(server->nfs_client);
2325 }
2326
2327 /*
2328  * OPEN_EXPIRED:
2329  *      reclaim state on the server after a network partition.
2330  *      Assumes caller holds the appropriate lock
2331  */
2332 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2333 {
2334         struct nfs4_opendata *opendata;
2335         int ret;
2336
2337         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2338                         NFS4_OPEN_CLAIM_FH);
2339         if (IS_ERR(opendata))
2340                 return PTR_ERR(opendata);
2341         ret = nfs4_open_recover(opendata, state);
2342         if (ret == -ESTALE)
2343                 d_drop(ctx->dentry);
2344         nfs4_opendata_put(opendata);
2345         return ret;
2346 }
2347
2348 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2349 {
2350         struct nfs_server *server = NFS_SERVER(state->inode);
2351         struct nfs4_exception exception = { };
2352         int err;
2353
2354         do {
2355                 err = _nfs4_open_expired(ctx, state);
2356                 trace_nfs4_open_expired(ctx, 0, err);
2357                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2358                         continue;
2359                 switch (err) {
2360                 default:
2361                         goto out;
2362                 case -NFS4ERR_GRACE:
2363                 case -NFS4ERR_DELAY:
2364                         nfs4_handle_exception(server, err, &exception);
2365                         err = 0;
2366                 }
2367         } while (exception.retry);
2368 out:
2369         return err;
2370 }
2371
2372 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2373 {
2374         struct nfs_open_context *ctx;
2375         int ret;
2376
2377         ctx = nfs4_state_find_open_context(state);
2378         if (IS_ERR(ctx))
2379                 return -EAGAIN;
2380         ret = nfs4_do_open_expired(ctx, state);
2381         put_nfs_open_context(ctx);
2382         return ret;
2383 }
2384
2385 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2386 {
2387         nfs_remove_bad_delegation(state->inode);
2388         write_seqlock(&state->seqlock);
2389         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2390         write_sequnlock(&state->seqlock);
2391         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2392 }
2393
2394 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2395 {
2396         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2397                 nfs_finish_clear_delegation_stateid(state);
2398 }
2399
2400 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2401 {
2402         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2403         nfs40_clear_delegation_stateid(state);
2404         return nfs4_open_expired(sp, state);
2405 }
2406
2407 #if defined(CONFIG_NFS_V4_1)
2408 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2409 {
2410         struct nfs_server *server = NFS_SERVER(state->inode);
2411         nfs4_stateid stateid;
2412         struct nfs_delegation *delegation;
2413         struct rpc_cred *cred;
2414         int status;
2415
2416         /* Get the delegation credential for use by test/free_stateid */
2417         rcu_read_lock();
2418         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2419         if (delegation == NULL) {
2420                 rcu_read_unlock();
2421                 return;
2422         }
2423
2424         nfs4_stateid_copy(&stateid, &delegation->stateid);
2425         cred = get_rpccred(delegation->cred);
2426         rcu_read_unlock();
2427         status = nfs41_test_stateid(server, &stateid, cred);
2428         trace_nfs4_test_delegation_stateid(state, NULL, status);
2429
2430         if (status != NFS_OK) {
2431                 /* Free the stateid unless the server explicitly
2432                  * informs us the stateid is unrecognized. */
2433                 if (status != -NFS4ERR_BAD_STATEID)
2434                         nfs41_free_stateid(server, &stateid, cred);
2435                 nfs_finish_clear_delegation_stateid(state);
2436         }
2437
2438         put_rpccred(cred);
2439 }
2440
2441 /**
2442  * nfs41_check_open_stateid - possibly free an open stateid
2443  *
2444  * @state: NFSv4 state for an inode
2445  *
2446  * Returns NFS_OK if recovery for this stateid is now finished.
2447  * Otherwise a negative NFS4ERR value is returned.
2448  */
2449 static int nfs41_check_open_stateid(struct nfs4_state *state)
2450 {
2451         struct nfs_server *server = NFS_SERVER(state->inode);
2452         nfs4_stateid *stateid = &state->open_stateid;
2453         struct rpc_cred *cred = state->owner->so_cred;
2454         int status;
2455
2456         /* If a state reset has been done, test_stateid is unneeded */
2457         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2458             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2459             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2460                 return -NFS4ERR_BAD_STATEID;
2461
2462         status = nfs41_test_stateid(server, stateid, cred);
2463         trace_nfs4_test_open_stateid(state, NULL, status);
2464         if (status != NFS_OK) {
2465                 /* Free the stateid unless the server explicitly
2466                  * informs us the stateid is unrecognized. */
2467                 if (status != -NFS4ERR_BAD_STATEID)
2468                         nfs41_free_stateid(server, stateid, cred);
2469
2470                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2471                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2472                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2473                 clear_bit(NFS_OPEN_STATE, &state->flags);
2474         }
2475         return status;
2476 }
2477
2478 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2479 {
2480         int status;
2481
2482         nfs41_check_delegation_stateid(state);
2483         status = nfs41_check_open_stateid(state);
2484         if (status != NFS_OK)
2485                 status = nfs4_open_expired(sp, state);
2486         return status;
2487 }
2488 #endif
2489
2490 /*
2491  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2492  * fields corresponding to attributes that were used to store the verifier.
2493  * Make sure we clobber those fields in the later setattr call
2494  */
2495 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2496                                 struct iattr *sattr, struct nfs4_label **label)
2497 {
2498         const u32 *attrset = opendata->o_res.attrset;
2499
2500         if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2501             !(sattr->ia_valid & ATTR_ATIME_SET))
2502                 sattr->ia_valid |= ATTR_ATIME;
2503
2504         if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2505             !(sattr->ia_valid & ATTR_MTIME_SET))
2506                 sattr->ia_valid |= ATTR_MTIME;
2507
2508         /* Except MODE, it seems harmless of setting twice. */
2509         if ((attrset[1] & FATTR4_WORD1_MODE))
2510                 sattr->ia_valid &= ~ATTR_MODE;
2511
2512         if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL)
2513                 *label = NULL;
2514 }
2515
2516 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2517                 fmode_t fmode,
2518                 int flags,
2519                 struct nfs_open_context *ctx)
2520 {
2521         struct nfs4_state_owner *sp = opendata->owner;
2522         struct nfs_server *server = sp->so_server;
2523         struct dentry *dentry;
2524         struct nfs4_state *state;
2525         unsigned int seq;
2526         int ret;
2527
2528         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2529
2530         ret = _nfs4_proc_open(opendata);
2531         if (ret != 0)
2532                 goto out;
2533
2534         state = nfs4_opendata_to_nfs4_state(opendata);
2535         ret = PTR_ERR(state);
2536         if (IS_ERR(state))
2537                 goto out;
2538         if (server->caps & NFS_CAP_POSIX_LOCK)
2539                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2540
2541         dentry = opendata->dentry;
2542         if (d_really_is_negative(dentry)) {
2543                 struct dentry *alias;
2544                 d_drop(dentry);
2545                 alias = d_exact_alias(dentry, state->inode);
2546                 if (!alias)
2547                         alias = d_splice_alias(igrab(state->inode), dentry);
2548                 /* d_splice_alias() can't fail here - it's a non-directory */
2549                 if (alias) {
2550                         dput(ctx->dentry);
2551                         ctx->dentry = dentry = alias;
2552                 }
2553                 nfs_set_verifier(dentry,
2554                                 nfs_save_change_attribute(d_inode(opendata->dir)));
2555         }
2556
2557         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2558         if (ret != 0)
2559                 goto out;
2560
2561         ctx->state = state;
2562         if (d_inode(dentry) == state->inode) {
2563                 nfs_inode_attach_open_context(ctx);
2564                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2565                         nfs4_schedule_stateid_recovery(server, state);
2566         }
2567 out:
2568         return ret;
2569 }
2570
2571 /*
2572  * Returns a referenced nfs4_state
2573  */
2574 static int _nfs4_do_open(struct inode *dir,
2575                         struct nfs_open_context *ctx,
2576                         int flags,
2577                         struct iattr *sattr,
2578                         struct nfs4_label *label,
2579                         int *opened)
2580 {
2581         struct nfs4_state_owner  *sp;
2582         struct nfs4_state     *state = NULL;
2583         struct nfs_server       *server = NFS_SERVER(dir);
2584         struct nfs4_opendata *opendata;
2585         struct dentry *dentry = ctx->dentry;
2586         struct rpc_cred *cred = ctx->cred;
2587         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2588         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2589         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2590         struct nfs4_label *olabel = NULL;
2591         int status;
2592
2593         /* Protect against reboot recovery conflicts */
2594         status = -ENOMEM;
2595         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2596         if (sp == NULL) {
2597                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2598                 goto out_err;
2599         }
2600         status = nfs4_recover_expired_lease(server);
2601         if (status != 0)
2602                 goto err_put_state_owner;
2603         if (d_really_is_positive(dentry))
2604                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2605         status = -ENOMEM;
2606         if (d_really_is_positive(dentry))
2607                 claim = NFS4_OPEN_CLAIM_FH;
2608         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2609                         label, claim, GFP_KERNEL);
2610         if (opendata == NULL)
2611                 goto err_put_state_owner;
2612
2613         if (label) {
2614                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2615                 if (IS_ERR(olabel)) {
2616                         status = PTR_ERR(olabel);
2617                         goto err_opendata_put;
2618                 }
2619         }
2620
2621         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2622                 if (!opendata->f_attr.mdsthreshold) {
2623                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2624                         if (!opendata->f_attr.mdsthreshold)
2625                                 goto err_free_label;
2626                 }
2627                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2628         }
2629         if (d_really_is_positive(dentry))
2630                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2631
2632         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2633         if (status != 0)
2634                 goto err_free_label;
2635         state = ctx->state;
2636
2637         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
2638             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2639                 nfs4_exclusive_attrset(opendata, sattr, &label);
2640                 /*
2641                  * send create attributes which was not set by open
2642                  * with an extra setattr.
2643                  */
2644                 if (sattr->ia_valid & NFS4_VALID_ATTRS) {
2645                         nfs_fattr_init(opendata->o_res.f_attr);
2646                         status = nfs4_do_setattr(state->inode, cred,
2647                                         opendata->o_res.f_attr, sattr,
2648                                         state, label, olabel);
2649                         if (status == 0) {
2650                                 nfs_setattr_update_inode(state->inode, sattr,
2651                                                 opendata->o_res.f_attr);
2652                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2653                         }
2654                 }
2655         }
2656         if (opened && opendata->file_created)
2657                 *opened |= FILE_CREATED;
2658
2659         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2660                 *ctx_th = opendata->f_attr.mdsthreshold;
2661                 opendata->f_attr.mdsthreshold = NULL;
2662         }
2663
2664         nfs4_label_free(olabel);
2665
2666         nfs4_opendata_put(opendata);
2667         nfs4_put_state_owner(sp);
2668         return 0;
2669 err_free_label:
2670         nfs4_label_free(olabel);
2671 err_opendata_put:
2672         nfs4_opendata_put(opendata);
2673 err_put_state_owner:
2674         nfs4_put_state_owner(sp);
2675 out_err:
2676         return status;
2677 }
2678
2679
2680 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2681                                         struct nfs_open_context *ctx,
2682                                         int flags,
2683                                         struct iattr *sattr,
2684                                         struct nfs4_label *label,
2685                                         int *opened)
2686 {
2687         struct nfs_server *server = NFS_SERVER(dir);
2688         struct nfs4_exception exception = { };
2689         struct nfs4_state *res;
2690         int status;
2691
2692         do {
2693                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2694                 res = ctx->state;
2695                 trace_nfs4_open_file(ctx, flags, status);
2696                 if (status == 0)
2697                         break;
2698                 /* NOTE: BAD_SEQID means the server and client disagree about the
2699                  * book-keeping w.r.t. state-changing operations
2700                  * (OPEN/CLOSE/LOCK/LOCKU...)
2701                  * It is actually a sign of a bug on the client or on the server.
2702                  *
2703                  * If we receive a BAD_SEQID error in the particular case of
2704                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2705                  * have unhashed the old state_owner for us, and that we can
2706                  * therefore safely retry using a new one. We should still warn
2707                  * the user though...
2708                  */
2709                 if (status == -NFS4ERR_BAD_SEQID) {
2710                         pr_warn_ratelimited("NFS: v4 server %s "
2711                                         " returned a bad sequence-id error!\n",
2712                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2713                         exception.retry = 1;
2714                         continue;
2715                 }
2716                 /*
2717                  * BAD_STATEID on OPEN means that the server cancelled our
2718                  * state before it received the OPEN_CONFIRM.
2719                  * Recover by retrying the request as per the discussion
2720                  * on Page 181 of RFC3530.
2721                  */
2722                 if (status == -NFS4ERR_BAD_STATEID) {
2723                         exception.retry = 1;
2724                         continue;
2725                 }
2726                 if (status == -EAGAIN) {
2727                         /* We must have found a delegation */
2728                         exception.retry = 1;
2729                         continue;
2730                 }
2731                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2732                         continue;
2733                 res = ERR_PTR(nfs4_handle_exception(server,
2734                                         status, &exception));
2735         } while (exception.retry);
2736         return res;
2737 }
2738
2739 static int _nfs4_do_setattr(struct inode *inode,
2740                             struct nfs_setattrargs *arg,
2741                             struct nfs_setattrres *res,
2742                             struct rpc_cred *cred,
2743                             struct nfs4_state *state)
2744 {
2745         struct nfs_server *server = NFS_SERVER(inode);
2746         struct rpc_message msg = {
2747                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2748                 .rpc_argp       = arg,
2749                 .rpc_resp       = res,
2750                 .rpc_cred       = cred,
2751         };
2752         struct rpc_cred *delegation_cred = NULL;
2753         unsigned long timestamp = jiffies;
2754         fmode_t fmode;
2755         bool truncate;
2756         int status;
2757
2758         nfs_fattr_init(res->fattr);
2759
2760         /* Servers should only apply open mode checks for file size changes */
2761         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
2762         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2763
2764         if (nfs4_copy_delegation_stateid(inode, fmode, &arg->stateid, &delegation_cred)) {
2765                 /* Use that stateid */
2766         } else if (truncate && state != NULL) {
2767                 struct nfs_lockowner lockowner = {
2768                         .l_owner = current->files,
2769                         .l_pid = current->tgid,
2770                 };
2771                 if (!nfs4_valid_open_stateid(state))
2772                         return -EBADF;
2773                 if (nfs4_select_rw_stateid(state, FMODE_WRITE, &lockowner,
2774                                 &arg->stateid, &delegation_cred) == -EIO)
2775                         return -EBADF;
2776         } else
2777                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
2778         if (delegation_cred)
2779                 msg.rpc_cred = delegation_cred;
2780
2781         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
2782
2783         put_rpccred(delegation_cred);
2784         if (status == 0 && state != NULL)
2785                 renew_lease(server, timestamp);
2786         trace_nfs4_setattr(inode, &arg->stateid, status);
2787         return status;
2788 }
2789
2790 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2791                            struct nfs_fattr *fattr, struct iattr *sattr,
2792                            struct nfs4_state *state, struct nfs4_label *ilabel,
2793                            struct nfs4_label *olabel)
2794 {
2795         struct nfs_server *server = NFS_SERVER(inode);
2796         struct nfs_setattrargs  arg = {
2797                 .fh             = NFS_FH(inode),
2798                 .iap            = sattr,
2799                 .server         = server,
2800                 .bitmask = server->attr_bitmask,
2801                 .label          = ilabel,
2802         };
2803         struct nfs_setattrres  res = {
2804                 .fattr          = fattr,
2805                 .label          = olabel,
2806                 .server         = server,
2807         };
2808         struct nfs4_exception exception = {
2809                 .state = state,
2810                 .inode = inode,
2811                 .stateid = &arg.stateid,
2812         };
2813         int err;
2814
2815         arg.bitmask = nfs4_bitmask(server, ilabel);
2816         if (ilabel)
2817                 arg.bitmask = nfs4_bitmask(server, olabel);
2818
2819         do {
2820                 err = _nfs4_do_setattr(inode, &arg, &res, cred, state);
2821                 switch (err) {
2822                 case -NFS4ERR_OPENMODE:
2823                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2824                                 pr_warn_once("NFSv4: server %s is incorrectly "
2825                                                 "applying open mode checks to "
2826                                                 "a SETATTR that is not "
2827                                                 "changing file size.\n",
2828                                                 server->nfs_client->cl_hostname);
2829                         }
2830                         if (state && !(state->state & FMODE_WRITE)) {
2831                                 err = -EBADF;
2832                                 if (sattr->ia_valid & ATTR_OPEN)
2833                                         err = -EACCES;
2834                                 goto out;
2835                         }
2836                 }
2837                 err = nfs4_handle_exception(server, err, &exception);
2838         } while (exception.retry);
2839 out:
2840         return err;
2841 }
2842
2843 static bool
2844 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
2845 {
2846         if (inode == NULL || !nfs_have_layout(inode))
2847                 return false;
2848
2849         return pnfs_wait_on_layoutreturn(inode, task);
2850 }
2851
2852 struct nfs4_closedata {
2853         struct inode *inode;
2854         struct nfs4_state *state;
2855         struct nfs_closeargs arg;
2856         struct nfs_closeres res;
2857         struct nfs_fattr fattr;
2858         unsigned long timestamp;
2859         bool roc;
2860         u32 roc_barrier;
2861 };
2862
2863 static void nfs4_free_closedata(void *data)
2864 {
2865         struct nfs4_closedata *calldata = data;
2866         struct nfs4_state_owner *sp = calldata->state->owner;
2867         struct super_block *sb = calldata->state->inode->i_sb;
2868
2869         if (calldata->roc)
2870                 pnfs_roc_release(calldata->state->inode);
2871         nfs4_put_open_state(calldata->state);
2872         nfs_free_seqid(calldata->arg.seqid);
2873         nfs4_put_state_owner(sp);
2874         nfs_sb_deactive(sb);
2875         kfree(calldata);
2876 }
2877
2878 static void nfs4_close_done(struct rpc_task *task, void *data)
2879 {
2880         struct nfs4_closedata *calldata = data;
2881         struct nfs4_state *state = calldata->state;
2882         struct nfs_server *server = NFS_SERVER(calldata->inode);
2883         nfs4_stateid *res_stateid = NULL;
2884
2885         dprintk("%s: begin!\n", __func__);
2886         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2887                 return;
2888         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2889         /* hmm. we are done with the inode, and in the process of freeing
2890          * the state_owner. we keep this around to process errors
2891          */
2892         switch (task->tk_status) {
2893                 case 0:
2894                         res_stateid = &calldata->res.stateid;
2895                         if (calldata->roc)
2896                                 pnfs_roc_set_barrier(state->inode,
2897                                                      calldata->roc_barrier);
2898                         renew_lease(server, calldata->timestamp);
2899                         break;
2900                 case -NFS4ERR_ADMIN_REVOKED:
2901                 case -NFS4ERR_STALE_STATEID:
2902                 case -NFS4ERR_OLD_STATEID:
2903                 case -NFS4ERR_BAD_STATEID:
2904                 case -NFS4ERR_EXPIRED:
2905                         if (!nfs4_stateid_match(&calldata->arg.stateid,
2906                                                 &state->open_stateid)) {
2907                                 rpc_restart_call_prepare(task);
2908                                 goto out_release;
2909                         }
2910                         if (calldata->arg.fmode == 0)
2911                                 break;
2912                 default:
2913                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2914                                 rpc_restart_call_prepare(task);
2915                                 goto out_release;
2916                         }
2917         }
2918         nfs_clear_open_stateid(state, &calldata->arg.stateid,
2919                         res_stateid, calldata->arg.fmode);
2920 out_release:
2921         nfs_release_seqid(calldata->arg.seqid);
2922         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2923         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2924 }
2925
2926 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2927 {
2928         struct nfs4_closedata *calldata = data;
2929         struct nfs4_state *state = calldata->state;
2930         struct inode *inode = calldata->inode;
2931         bool is_rdonly, is_wronly, is_rdwr;
2932         int call_close = 0;
2933
2934         dprintk("%s: begin!\n", __func__);
2935         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2936                 goto out_wait;
2937
2938         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2939         spin_lock(&state->owner->so_lock);
2940         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2941         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2942         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2943         nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
2944         /* Calculate the change in open mode */
2945         calldata->arg.fmode = 0;
2946         if (state->n_rdwr == 0) {
2947                 if (state->n_rdonly == 0)
2948                         call_close |= is_rdonly;
2949                 else if (is_rdonly)
2950                         calldata->arg.fmode |= FMODE_READ;
2951                 if (state->n_wronly == 0)
2952                         call_close |= is_wronly;
2953                 else if (is_wronly)
2954                         calldata->arg.fmode |= FMODE_WRITE;
2955                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
2956                         call_close |= is_rdwr;
2957         } else if (is_rdwr)
2958                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2959
2960         if (!nfs4_valid_open_stateid(state))
2961                 call_close = 0;
2962         spin_unlock(&state->owner->so_lock);
2963
2964         if (!call_close) {
2965                 /* Note: exit _without_ calling nfs4_close_done */
2966                 goto out_no_action;
2967         }
2968
2969         if (nfs4_wait_on_layoutreturn(inode, task)) {
2970                 nfs_release_seqid(calldata->arg.seqid);
2971                 goto out_wait;
2972         }
2973
2974         if (calldata->arg.fmode == 0)
2975                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2976         if (calldata->roc)
2977                 pnfs_roc_get_barrier(inode, &calldata->roc_barrier);
2978
2979         calldata->arg.share_access =
2980                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
2981                                 calldata->arg.fmode, 0);
2982
2983         nfs_fattr_init(calldata->res.fattr);
2984         calldata->timestamp = jiffies;
2985         if (nfs4_setup_sequence(NFS_SERVER(inode),
2986                                 &calldata->arg.seq_args,
2987                                 &calldata->res.seq_res,
2988                                 task) != 0)
2989                 nfs_release_seqid(calldata->arg.seqid);
2990         dprintk("%s: done!\n", __func__);
2991         return;
2992 out_no_action:
2993         task->tk_action = NULL;
2994 out_wait:
2995         nfs4_sequence_done(task, &calldata->res.seq_res);
2996 }
2997
2998 static const struct rpc_call_ops nfs4_close_ops = {
2999         .rpc_call_prepare = nfs4_close_prepare,
3000         .rpc_call_done = nfs4_close_done,
3001         .rpc_release = nfs4_free_closedata,
3002 };
3003
3004 static bool nfs4_roc(struct inode *inode)
3005 {
3006         if (!nfs_have_layout(inode))
3007                 return false;
3008         return pnfs_roc(inode);
3009 }
3010
3011 /*
3012  * It is possible for data to be read/written from a mem-mapped file
3013  * after the sys_close call (which hits the vfs layer as a flush).
3014  * This means that we can't safely call nfsv4 close on a file until
3015  * the inode is cleared. This in turn means that we are not good
3016  * NFSv4 citizens - we do not indicate to the server to update the file's
3017  * share state even when we are done with one of the three share
3018  * stateid's in the inode.
3019  *
3020  * NOTE: Caller must be holding the sp->so_owner semaphore!
3021  */
3022 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3023 {
3024         struct nfs_server *server = NFS_SERVER(state->inode);
3025         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3026         struct nfs4_closedata *calldata;
3027         struct nfs4_state_owner *sp = state->owner;
3028         struct rpc_task *task;
3029         struct rpc_message msg = {
3030                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3031                 .rpc_cred = state->owner->so_cred,
3032         };
3033         struct rpc_task_setup task_setup_data = {
3034                 .rpc_client = server->client,
3035                 .rpc_message = &msg,
3036                 .callback_ops = &nfs4_close_ops,
3037                 .workqueue = nfsiod_workqueue,
3038                 .flags = RPC_TASK_ASYNC,
3039         };
3040         int status = -ENOMEM;
3041
3042         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3043                 &task_setup_data.rpc_client, &msg);
3044
3045         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3046         if (calldata == NULL)
3047                 goto out;
3048         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
3049         calldata->inode = state->inode;
3050         calldata->state = state;
3051         calldata->arg.fh = NFS_FH(state->inode);
3052         /* Serialization for the sequence id */
3053         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3054         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3055         if (IS_ERR(calldata->arg.seqid))
3056                 goto out_free_calldata;
3057         calldata->arg.fmode = 0;
3058         calldata->arg.bitmask = server->cache_consistency_bitmask;
3059         calldata->res.fattr = &calldata->fattr;
3060         calldata->res.seqid = calldata->arg.seqid;
3061         calldata->res.server = server;
3062         calldata->roc = nfs4_roc(state->inode);
3063         nfs_sb_active(calldata->inode->i_sb);
3064
3065         msg.rpc_argp = &calldata->arg;
3066         msg.rpc_resp = &calldata->res;
3067         task_setup_data.callback_data = calldata;
3068         task = rpc_run_task(&task_setup_data);
3069         if (IS_ERR(task))
3070                 return PTR_ERR(task);
3071         status = 0;
3072         if (wait)
3073                 status = rpc_wait_for_completion_task(task);
3074         rpc_put_task(task);
3075         return status;
3076 out_free_calldata:
3077         kfree(calldata);
3078 out:
3079         nfs4_put_open_state(state);
3080         nfs4_put_state_owner(sp);
3081         return status;
3082 }
3083
3084 static struct inode *
3085 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3086                 int open_flags, struct iattr *attr, int *opened)
3087 {
3088         struct nfs4_state *state;
3089         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3090
3091         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3092
3093         /* Protect against concurrent sillydeletes */
3094         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3095
3096         nfs4_label_release_security(label);
3097
3098         if (IS_ERR(state))
3099                 return ERR_CAST(state);
3100         return state->inode;
3101 }
3102
3103 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3104 {
3105         if (ctx->state == NULL)
3106                 return;
3107         if (is_sync)
3108                 nfs4_close_sync(ctx->state, ctx->mode);
3109         else
3110                 nfs4_close_state(ctx->state, ctx->mode);
3111 }
3112
3113 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3114 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3115 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
3116
3117 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3118 {
3119         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3120         struct nfs4_server_caps_arg args = {
3121                 .fhandle = fhandle,
3122                 .bitmask = bitmask,
3123         };
3124         struct nfs4_server_caps_res res = {};
3125         struct rpc_message msg = {
3126                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3127                 .rpc_argp = &args,
3128                 .rpc_resp = &res,
3129         };
3130         int status;
3131
3132         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3133                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3134                      FATTR4_WORD0_LINK_SUPPORT |
3135                      FATTR4_WORD0_SYMLINK_SUPPORT |
3136                      FATTR4_WORD0_ACLSUPPORT;
3137         if (minorversion)
3138                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3139
3140         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3141         if (status == 0) {
3142                 /* Sanity check the server answers */
3143                 switch (minorversion) {
3144                 case 0:
3145                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3146                         res.attr_bitmask[2] = 0;
3147                         break;
3148                 case 1:
3149                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3150                         break;
3151                 case 2:
3152                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3153                 }
3154                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3155                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3156                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3157                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3158                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3159                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
3160                                 NFS_CAP_SECURITY_LABEL);
3161                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3162                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3163                         server->caps |= NFS_CAP_ACLS;
3164                 if (res.has_links != 0)
3165                         server->caps |= NFS_CAP_HARDLINKS;
3166                 if (res.has_symlinks != 0)
3167                         server->caps |= NFS_CAP_SYMLINKS;
3168                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3169                         server->caps |= NFS_CAP_FILEID;
3170                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3171                         server->caps |= NFS_CAP_MODE;
3172                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3173                         server->caps |= NFS_CAP_NLINK;
3174                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3175                         server->caps |= NFS_CAP_OWNER;
3176                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3177                         server->caps |= NFS_CAP_OWNER_GROUP;
3178                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3179                         server->caps |= NFS_CAP_ATIME;
3180                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3181                         server->caps |= NFS_CAP_CTIME;
3182                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3183                         server->caps |= NFS_CAP_MTIME;
3184 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3185                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3186                         server->caps |= NFS_CAP_SECURITY_LABEL;
3187 #endif
3188                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3189                                 sizeof(server->attr_bitmask));
3190                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3191
3192                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3193                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3194                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3195                 server->cache_consistency_bitmask[2] = 0;
3196                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3197                         sizeof(server->exclcreat_bitmask));
3198                 server->acl_bitmask = res.acl_bitmask;
3199                 server->fh_expire_type = res.fh_expire_type;
3200         }
3201
3202         return status;
3203 }
3204
3205 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3206 {
3207         struct nfs4_exception exception = { };
3208         int err;
3209         do {
3210                 err = nfs4_handle_exception(server,
3211                                 _nfs4_server_capabilities(server, fhandle),
3212                                 &exception);
3213         } while (exception.retry);
3214         return err;
3215 }
3216
3217 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3218                 struct nfs_fsinfo *info)
3219 {
3220         u32 bitmask[3];
3221         struct nfs4_lookup_root_arg args = {
3222                 .bitmask = bitmask,
3223         };
3224         struct nfs4_lookup_res res = {
3225                 .server = server,
3226                 .fattr = info->fattr,
3227                 .fh = fhandle,
3228         };
3229         struct rpc_message msg = {
3230                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3231                 .rpc_argp = &args,
3232                 .rpc_resp = &res,
3233         };
3234
3235         bitmask[0] = nfs4_fattr_bitmap[0];
3236         bitmask[1] = nfs4_fattr_bitmap[1];
3237         /*
3238          * Process the label in the upcoming getfattr
3239          */
3240         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3241
3242         nfs_fattr_init(info->fattr);
3243         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3244 }
3245
3246 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3247                 struct nfs_fsinfo *info)
3248 {
3249         struct nfs4_exception exception = { };
3250         int err;
3251         do {
3252                 err = _nfs4_lookup_root(server, fhandle, info);
3253                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3254                 switch (err) {
3255                 case 0:
3256                 case -NFS4ERR_WRONGSEC:
3257                         goto out;
3258                 default:
3259                         err = nfs4_handle_exception(server, err, &exception);
3260                 }
3261         } while (exception.retry);
3262 out:
3263         return err;
3264 }
3265
3266 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3267                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3268 {
3269         struct rpc_auth_create_args auth_args = {
3270                 .pseudoflavor = flavor,
3271         };
3272         struct rpc_auth *auth;
3273         int ret;
3274
3275         auth = rpcauth_create(&auth_args, server->client);
3276         if (IS_ERR(auth)) {
3277                 ret = -EACCES;
3278                 goto out;
3279         }
3280         ret = nfs4_lookup_root(server, fhandle, info);
3281 out:
3282         return ret;
3283 }
3284
3285 /*
3286  * Retry pseudoroot lookup with various security flavors.  We do this when:
3287  *
3288  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3289  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3290  *
3291  * Returns zero on success, or a negative NFS4ERR value, or a
3292  * negative errno value.
3293  */
3294 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3295                               struct nfs_fsinfo *info)
3296 {
3297         /* Per 3530bis 15.33.5 */
3298         static const rpc_authflavor_t flav_array[] = {
3299                 RPC_AUTH_GSS_KRB5P,
3300                 RPC_AUTH_GSS_KRB5I,
3301                 RPC_AUTH_GSS_KRB5,
3302                 RPC_AUTH_UNIX,                  /* courtesy */
3303                 RPC_AUTH_NULL,
3304         };
3305         int status = -EPERM;
3306         size_t i;
3307
3308         if (server->auth_info.flavor_len > 0) {
3309                 /* try each flavor specified by user */
3310                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3311                         status = nfs4_lookup_root_sec(server, fhandle, info,
3312                                                 server->auth_info.flavors[i]);
3313                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3314                                 continue;
3315                         break;
3316                 }
3317         } else {
3318                 /* no flavors specified by user, try default list */
3319                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3320                         status = nfs4_lookup_root_sec(server, fhandle, info,
3321                                                       flav_array[i]);
3322                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3323                                 continue;
3324                         break;
3325                 }
3326         }
3327
3328         /*
3329          * -EACCESS could mean that the user doesn't have correct permissions
3330          * to access the mount.  It could also mean that we tried to mount
3331          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3332          * existing mount programs don't handle -EACCES very well so it should
3333          * be mapped to -EPERM instead.
3334          */
3335         if (status == -EACCES)
3336                 status = -EPERM;
3337         return status;
3338 }
3339
3340 /**
3341  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3342  * @server: initialized nfs_server handle
3343  * @fhandle: we fill in the pseudo-fs root file handle
3344  * @info: we fill in an FSINFO struct
3345  * @auth_probe: probe the auth flavours
3346  *
3347  * Returns zero on success, or a negative errno.
3348  */
3349 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3350                          struct nfs_fsinfo *info,
3351                          bool auth_probe)
3352 {
3353         int status = 0;
3354
3355         if (!auth_probe)
3356                 status = nfs4_lookup_root(server, fhandle, info);
3357
3358         if (auth_probe || status == NFS4ERR_WRONGSEC)
3359                 status = server->nfs_client->cl_mvops->find_root_sec(server,
3360                                 fhandle, info);
3361
3362         if (status == 0)
3363                 status = nfs4_server_capabilities(server, fhandle);
3364         if (status == 0)
3365                 status = nfs4_do_fsinfo(server, fhandle, info);
3366
3367         return nfs4_map_errors(status);
3368 }
3369
3370 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3371                               struct nfs_fsinfo *info)
3372 {
3373         int error;
3374         struct nfs_fattr *fattr = info->fattr;
3375         struct nfs4_label *label = NULL;
3376
3377         error = nfs4_server_capabilities(server, mntfh);
3378         if (error < 0) {
3379                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3380                 return error;
3381         }
3382
3383         label = nfs4_label_alloc(server, GFP_KERNEL);
3384         if (IS_ERR(label))
3385                 return PTR_ERR(label);
3386
3387         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3388         if (error < 0) {
3389                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3390                 goto err_free_label;
3391         }
3392
3393         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3394             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3395                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3396
3397 err_free_label:
3398         nfs4_label_free(label);
3399
3400         return error;
3401 }
3402
3403 /*
3404  * Get locations and (maybe) other attributes of a referral.
3405  * Note that we'll actually follow the referral later when
3406  * we detect fsid mismatch in inode revalidation
3407  */
3408 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3409                              const struct qstr *name, struct nfs_fattr *fattr,
3410                              struct nfs_fh *fhandle)
3411 {
3412         int status = -ENOMEM;
3413         struct page *page = NULL;
3414         struct nfs4_fs_locations *locations = NULL;
3415
3416         page = alloc_page(GFP_KERNEL);
3417         if (page == NULL)
3418                 goto out;
3419         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3420         if (locations == NULL)
3421                 goto out;
3422
3423         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3424         if (status != 0)
3425                 goto out;
3426
3427         /*
3428          * If the fsid didn't change, this is a migration event, not a
3429          * referral.  Cause us to drop into the exception handler, which
3430          * will kick off migration recovery.
3431          */
3432         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3433                 dprintk("%s: server did not return a different fsid for"
3434                         " a referral at %s\n", __func__, name->name);
3435                 status = -NFS4ERR_MOVED;
3436                 goto out;
3437         }
3438         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3439         nfs_fixup_referral_attributes(&locations->fattr);
3440
3441         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3442         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3443         memset(fhandle, 0, sizeof(struct nfs_fh));
3444 out:
3445         if (page)
3446                 __free_page(page);
3447         kfree(locations);
3448         return status;
3449 }
3450
3451 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3452                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3453 {
3454         struct nfs4_getattr_arg args = {
3455                 .fh = fhandle,
3456                 .bitmask = server->attr_bitmask,
3457         };
3458         struct nfs4_getattr_res res = {
3459                 .fattr = fattr,
3460                 .label = label,
3461                 .server = server,
3462         };
3463         struct rpc_message msg = {
3464                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3465                 .rpc_argp = &args,
3466                 .rpc_resp = &res,
3467         };
3468
3469         args.bitmask = nfs4_bitmask(server, label);
3470
3471         nfs_fattr_init(fattr);
3472         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3473 }
3474
3475 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3476                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3477 {
3478         struct nfs4_exception exception = { };
3479         int err;
3480         do {
3481                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3482                 trace_nfs4_getattr(server, fhandle, fattr, err);
3483                 err = nfs4_handle_exception(server, err,
3484                                 &exception);
3485         } while (exception.retry);
3486         return err;
3487 }
3488
3489 /*
3490  * The file is not closed if it is opened due to the a request to change
3491  * the size of the file. The open call will not be needed once the
3492  * VFS layer lookup-intents are implemented.
3493  *
3494  * Close is called when the inode is destroyed.
3495  * If we haven't opened the file for O_WRONLY, we
3496  * need to in the size_change case to obtain a stateid.
3497  *
3498  * Got race?
3499  * Because OPEN is always done by name in nfsv4, it is
3500  * possible that we opened a different file by the same
3501  * name.  We can recognize this race condition, but we
3502  * can't do anything about it besides returning an error.
3503  *
3504  * This will be fixed with VFS changes (lookup-intent).
3505  */
3506 static int
3507 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3508                   struct iattr *sattr)
3509 {
3510         struct inode *inode = d_inode(dentry);
3511         struct rpc_cred *cred = NULL;
3512         struct nfs4_state *state = NULL;
3513         struct nfs4_label *label = NULL;
3514         int status;
3515
3516         if (pnfs_ld_layoutret_on_setattr(inode) &&
3517             sattr->ia_valid & ATTR_SIZE &&
3518             sattr->ia_size < i_size_read(inode))
3519                 pnfs_commit_and_return_layout(inode);
3520
3521         nfs_fattr_init(fattr);
3522
3523         /* Deal with open(O_TRUNC) */
3524         if (sattr->ia_valid & ATTR_OPEN)
3525                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3526
3527         /* Optimization: if the end result is no change, don't RPC */
3528         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3529                 return 0;
3530
3531         /* Search for an existing open(O_WRITE) file */
3532         if (sattr->ia_valid & ATTR_FILE) {
3533                 struct nfs_open_context *ctx;
3534
3535                 ctx = nfs_file_open_context(sattr->ia_file);
3536                 if (ctx) {
3537                         cred = ctx->cred;
3538                         state = ctx->state;
3539                 }
3540         }
3541
3542         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3543         if (IS_ERR(label))
3544                 return PTR_ERR(label);
3545
3546         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3547         if (status == 0) {
3548                 nfs_setattr_update_inode(inode, sattr, fattr);
3549                 nfs_setsecurity(inode, fattr, label);
3550         }
3551         nfs4_label_free(label);
3552         return status;
3553 }
3554
3555 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3556                 const struct qstr *name, struct nfs_fh *fhandle,
3557                 struct nfs_fattr *fattr, struct nfs4_label *label)
3558 {
3559         struct nfs_server *server = NFS_SERVER(dir);
3560         int                    status;
3561         struct nfs4_lookup_arg args = {
3562                 .bitmask = server->attr_bitmask,
3563                 .dir_fh = NFS_FH(dir),
3564                 .name = name,
3565         };
3566         struct nfs4_lookup_res res = {
3567                 .server = server,
3568                 .fattr = fattr,
3569                 .label = label,
3570                 .fh = fhandle,
3571         };
3572         struct rpc_message msg = {
3573                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3574                 .rpc_argp = &args,
3575                 .rpc_resp = &res,
3576         };
3577
3578         args.bitmask = nfs4_bitmask(server, label);
3579
3580         nfs_fattr_init(fattr);
3581
3582         dprintk("NFS call  lookup %s\n", name->name);
3583         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3584         dprintk("NFS reply lookup: %d\n", status);
3585         return status;
3586 }
3587
3588 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3589 {
3590         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3591                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3592         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3593         fattr->nlink = 2;
3594 }
3595
3596 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3597                                    const struct qstr *name, struct nfs_fh *fhandle,
3598                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3599 {
3600         struct nfs4_exception exception = { };
3601         struct rpc_clnt *client = *clnt;
3602         int err;
3603         do {
3604                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3605                 trace_nfs4_lookup(dir, name, err);
3606                 switch (err) {
3607                 case -NFS4ERR_BADNAME:
3608                         err = -ENOENT;
3609                         goto out;
3610                 case -NFS4ERR_MOVED:
3611                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3612                         if (err == -NFS4ERR_MOVED)
3613                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3614                         goto out;
3615                 case -NFS4ERR_WRONGSEC:
3616                         err = -EPERM;
3617                         if (client != *clnt)
3618                                 goto out;
3619                         client = nfs4_negotiate_security(client, dir, name);
3620                         if (IS_ERR(client))
3621                                 return PTR_ERR(client);
3622
3623                         exception.retry = 1;
3624                         break;
3625                 default:
3626                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3627                 }
3628         } while (exception.retry);
3629
3630 out:
3631         if (err == 0)
3632                 *clnt = client;
3633         else if (client != *clnt)
3634                 rpc_shutdown_client(client);
3635
3636         return err;
3637 }
3638
3639 static int nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
3640                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3641                             struct nfs4_label *label)
3642 {
3643         int status;
3644         struct rpc_clnt *client = NFS_CLIENT(dir);
3645
3646         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3647         if (client != NFS_CLIENT(dir)) {
3648                 rpc_shutdown_client(client);
3649                 nfs_fixup_secinfo_attributes(fattr);
3650         }
3651         return status;
3652 }
3653
3654 struct rpc_clnt *
3655 nfs4_proc_lookup_mountpoint(struct inode *dir, const struct qstr *name,
3656                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3657 {
3658         struct rpc_clnt *client = NFS_CLIENT(dir);
3659         int status;
3660
3661         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3662         if (status < 0)
3663                 return ERR_PTR(status);
3664         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3665 }
3666
3667 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3668 {
3669         struct nfs_server *server = NFS_SERVER(inode);
3670         struct nfs4_accessargs args = {
3671                 .fh = NFS_FH(inode),
3672                 .bitmask = server->cache_consistency_bitmask,
3673         };
3674         struct nfs4_accessres res = {
3675                 .server = server,
3676         };
3677         struct rpc_message msg = {
3678                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3679                 .rpc_argp = &args,
3680                 .rpc_resp = &res,
3681                 .rpc_cred = entry->cred,
3682         };
3683         int mode = entry->mask;
3684         int status = 0;
3685
3686         /*
3687          * Determine which access bits we want to ask for...
3688          */
3689         if (mode & MAY_READ)
3690                 args.access |= NFS4_ACCESS_READ;
3691         if (S_ISDIR(inode->i_mode)) {
3692                 if (mode & MAY_WRITE)
3693                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3694                 if (mode & MAY_EXEC)
3695                         args.access |= NFS4_ACCESS_LOOKUP;
3696         } else {
3697                 if (mode & MAY_WRITE)
3698                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3699                 if (mode & MAY_EXEC)
3700                         args.access |= NFS4_ACCESS_EXECUTE;
3701         }
3702
3703         res.fattr = nfs_alloc_fattr();
3704         if (res.fattr == NULL)
3705                 return -ENOMEM;
3706
3707         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3708         if (!status) {
3709                 nfs_access_set_mask(entry, res.access);
3710                 nfs_refresh_inode(inode, res.fattr);
3711         }
3712         nfs_free_fattr(res.fattr);
3713         return status;
3714 }
3715
3716 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3717 {
3718         struct nfs4_exception exception = { };
3719         int err;
3720         do {
3721                 err = _nfs4_proc_access(inode, entry);
3722                 trace_nfs4_access(inode, err);
3723                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3724                                 &exception);
3725         } while (exception.retry);
3726         return err;
3727 }
3728
3729 /*
3730  * TODO: For the time being, we don't try to get any attributes
3731  * along with any of the zero-copy operations READ, READDIR,
3732  * READLINK, WRITE.
3733  *
3734  * In the case of the first three, we want to put the GETATTR
3735  * after the read-type operation -- this is because it is hard
3736  * to predict the length of a GETATTR response in v4, and thus
3737  * align the READ data correctly.  This means that the GETATTR
3738  * may end up partially falling into the page cache, and we should
3739  * shift it into the 'tail' of the xdr_buf before processing.
3740  * To do this efficiently, we need to know the total length
3741  * of data received, which doesn't seem to be available outside
3742  * of the RPC layer.
3743  *
3744  * In the case of WRITE, we also want to put the GETATTR after
3745  * the operation -- in this case because we want to make sure
3746  * we get the post-operation mtime and size.
3747  *
3748  * Both of these changes to the XDR layer would in fact be quite
3749  * minor, but I decided to leave them for a subsequent patch.
3750  */
3751 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3752                 unsigned int pgbase, unsigned int pglen)
3753 {
3754         struct nfs4_readlink args = {
3755                 .fh       = NFS_FH(inode),
3756                 .pgbase   = pgbase,
3757                 .pglen    = pglen,
3758                 .pages    = &page,
3759         };
3760         struct nfs4_readlink_res res;
3761         struct rpc_message msg = {
3762                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3763                 .rpc_argp = &args,
3764                 .rpc_resp = &res,
3765         };
3766
3767         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3768 }
3769
3770 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3771                 unsigned int pgbase, unsigned int pglen)
3772 {
3773         struct nfs4_exception exception = { };
3774         int err;
3775         do {
3776                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3777                 trace_nfs4_readlink(inode, err);
3778                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3779                                 &exception);
3780         } while (exception.retry);
3781         return err;
3782 }
3783
3784 /*
3785  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3786  */
3787 static int
3788 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3789                  int flags)
3790 {
3791         struct nfs4_label l, *ilabel = NULL;
3792         struct nfs_open_context *ctx;
3793         struct nfs4_state *state;
3794         int status = 0;
3795
3796         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3797         if (IS_ERR(ctx))
3798                 return PTR_ERR(ctx);
3799
3800         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3801
3802         sattr->ia_mode &= ~current_umask();
3803         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
3804         if (IS_ERR(state)) {
3805                 status = PTR_ERR(state);
3806                 goto out;
3807         }
3808 out:
3809         nfs4_label_release_security(ilabel);
3810         put_nfs_open_context(ctx);
3811         return status;
3812 }
3813
3814 static int _nfs4_proc_remove(struct inode *dir, const struct qstr *name)
3815 {
3816         struct nfs_server *server = NFS_SERVER(dir);
3817         struct nfs_removeargs args = {
3818                 .fh = NFS_FH(dir),
3819                 .name = *name,
3820         };
3821         struct nfs_removeres res = {
3822                 .server = server,
3823         };
3824         struct rpc_message msg = {
3825                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3826                 .rpc_argp = &args,
3827                 .rpc_resp = &res,
3828         };
3829         int status;
3830
3831         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3832         if (status == 0)
3833                 update_changeattr(dir, &res.cinfo);
3834         return status;
3835 }
3836
3837 static int nfs4_proc_remove(struct inode *dir, const struct qstr *name)
3838 {
3839         struct nfs4_exception exception = { };
3840         int err;
3841         do {
3842                 err = _nfs4_proc_remove(dir, name);
3843                 trace_nfs4_remove(dir, name, err);
3844                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3845                                 &exception);
3846         } while (exception.retry);
3847         return err;
3848 }
3849
3850 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3851 {
3852         struct nfs_server *server = NFS_SERVER(dir);
3853         struct nfs_removeargs *args = msg->rpc_argp;
3854         struct nfs_removeres *res = msg->rpc_resp;
3855
3856         res->server = server;
3857         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3858         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3859
3860         nfs_fattr_init(res->dir_attr);
3861 }
3862
3863 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3864 {
3865         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb),
3866                         &data->args.seq_args,
3867                         &data->res.seq_res,
3868                         task);
3869 }
3870
3871 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3872 {
3873         struct nfs_unlinkdata *data = task->tk_calldata;
3874         struct nfs_removeres *res = &data->res;
3875
3876         if (!nfs4_sequence_done(task, &res->seq_res))
3877                 return 0;
3878         if (nfs4_async_handle_error(task, res->server, NULL,
3879                                     &data->timeout) == -EAGAIN)
3880                 return 0;
3881         update_changeattr(dir, &res->cinfo);
3882         return 1;
3883 }
3884
3885 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3886 {
3887         struct nfs_server *server = NFS_SERVER(dir);
3888         struct nfs_renameargs *arg = msg->rpc_argp;
3889         struct nfs_renameres *res = msg->rpc_resp;
3890
3891         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3892         res->server = server;
3893         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3894 }
3895
3896 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3897 {
3898         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3899                         &data->args.seq_args,
3900                         &data->res.seq_res,
3901                         task);
3902 }
3903
3904 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3905                                  struct inode *new_dir)
3906 {
3907         struct nfs_renamedata *data = task->tk_calldata;
3908         struct nfs_renameres *res = &data->res;
3909
3910         if (!nfs4_sequence_done(task, &res->seq_res))
3911                 return 0;
3912         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3913                 return 0;
3914
3915         update_changeattr(old_dir, &res->old_cinfo);
3916         update_changeattr(new_dir, &res->new_cinfo);
3917         return 1;
3918 }
3919
3920 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
3921 {
3922         struct nfs_server *server = NFS_SERVER(inode);
3923         struct nfs4_link_arg arg = {
3924                 .fh     = NFS_FH(inode),
3925                 .dir_fh = NFS_FH(dir),
3926                 .name   = name,
3927                 .bitmask = server->attr_bitmask,
3928         };
3929         struct nfs4_link_res res = {
3930                 .server = server,
3931                 .label = NULL,
3932         };
3933         struct rpc_message msg = {
3934                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3935                 .rpc_argp = &arg,
3936                 .rpc_resp = &res,
3937         };
3938         int status = -ENOMEM;
3939
3940         res.fattr = nfs_alloc_fattr();
3941         if (res.fattr == NULL)
3942                 goto out;
3943
3944         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3945         if (IS_ERR(res.label)) {
3946                 status = PTR_ERR(res.label);
3947                 goto out;
3948         }
3949         arg.bitmask = nfs4_bitmask(server, res.label);
3950
3951         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3952         if (!status) {
3953                 update_changeattr(dir, &res.cinfo);
3954                 status = nfs_post_op_update_inode(inode, res.fattr);
3955                 if (!status)
3956                         nfs_setsecurity(inode, res.fattr, res.label);
3957         }
3958
3959
3960         nfs4_label_free(res.label);
3961
3962 out:
3963         nfs_free_fattr(res.fattr);
3964         return status;
3965 }
3966
3967 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
3968 {
3969         struct nfs4_exception exception = { };
3970         int err;
3971         do {
3972                 err = nfs4_handle_exception(NFS_SERVER(inode),
3973                                 _nfs4_proc_link(inode, dir, name),
3974                                 &exception);
3975         } while (exception.retry);
3976         return err;
3977 }
3978
3979 struct nfs4_createdata {
3980         struct rpc_message msg;
3981         struct nfs4_create_arg arg;
3982         struct nfs4_create_res res;
3983         struct nfs_fh fh;
3984         struct nfs_fattr fattr;
3985         struct nfs4_label *label;
3986 };
3987
3988 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3989                 const struct qstr *name, struct iattr *sattr, u32 ftype)
3990 {
3991         struct nfs4_createdata *data;
3992
3993         data = kzalloc(sizeof(*data), GFP_KERNEL);
3994         if (data != NULL) {
3995                 struct nfs_server *server = NFS_SERVER(dir);
3996
3997                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3998                 if (IS_ERR(data->label))
3999                         goto out_free;
4000
4001                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4002                 data->msg.rpc_argp = &data->arg;
4003                 data->msg.rpc_resp = &data->res;
4004                 data->arg.dir_fh = NFS_FH(dir);
4005                 data->arg.server = server;
4006                 data->arg.name = name;
4007                 data->arg.attrs = sattr;
4008                 data->arg.ftype = ftype;
4009                 data->arg.bitmask = nfs4_bitmask(server, data->label);
4010                 data->res.server = server;
4011                 data->res.fh = &data->fh;
4012                 data->res.fattr = &data->fattr;
4013                 data->res.label = data->label;
4014                 nfs_fattr_init(data->res.fattr);
4015         }
4016         return data;
4017 out_free:
4018         kfree(data);
4019         return NULL;
4020 }
4021
4022 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4023 {
4024         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4025                                     &data->arg.seq_args, &data->res.seq_res, 1);
4026         if (status == 0) {
4027                 update_changeattr(dir, &data->res.dir_cinfo);
4028                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
4029         }
4030         return status;
4031 }
4032
4033 static void nfs4_free_createdata(struct nfs4_createdata *data)
4034 {
4035         nfs4_label_free(data->label);
4036         kfree(data);
4037 }
4038
4039 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4040                 struct page *page, unsigned int len, struct iattr *sattr,
4041                 struct nfs4_label *label)
4042 {
4043         struct nfs4_createdata *data;
4044         int status = -ENAMETOOLONG;
4045
4046         if (len > NFS4_MAXPATHLEN)
4047                 goto out;
4048
4049         status = -ENOMEM;
4050         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
4051         if (data == NULL)
4052                 goto out;
4053
4054         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
4055         data->arg.u.symlink.pages = &page;
4056         data->arg.u.symlink.len = len;
4057         data->arg.label = label;
4058
4059         status = nfs4_do_create(dir, dentry, data);
4060
4061         nfs4_free_createdata(data);
4062 out:
4063         return status;
4064 }
4065
4066 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4067                 struct page *page, unsigned int len, struct iattr *sattr)
4068 {
4069         struct nfs4_exception exception = { };
4070         struct nfs4_label l, *label = NULL;
4071         int err;
4072
4073         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4074
4075         do {
4076                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
4077                 trace_nfs4_symlink(dir, &dentry->d_name, err);
4078                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4079                                 &exception);
4080         } while (exception.retry);
4081
4082         nfs4_label_release_security(label);
4083         return err;
4084 }
4085
4086 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4087                 struct iattr *sattr, struct nfs4_label *label)
4088 {
4089         struct nfs4_createdata *data;
4090         int status = -ENOMEM;
4091
4092         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4093         if (data == NULL)
4094                 goto out;
4095
4096         data->arg.label = label;
4097         status = nfs4_do_create(dir, dentry, data);
4098
4099         nfs4_free_createdata(data);
4100 out:
4101         return status;
4102 }
4103
4104 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4105                 struct iattr *sattr)
4106 {
4107         struct nfs4_exception exception = { };
4108         struct nfs4_label l, *label = NULL;
4109         int err;
4110
4111         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4112
4113         sattr->ia_mode &= ~current_umask();
4114         do {
4115                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4116                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4117                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4118                                 &exception);
4119         } while (exception.retry);
4120         nfs4_label_release_security(label);
4121
4122         return err;
4123 }
4124
4125 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4126                 u64 cookie, struct page **pages, unsigned int count, int plus)
4127 {
4128         struct inode            *dir = d_inode(dentry);
4129         struct nfs4_readdir_arg args = {
4130                 .fh = NFS_FH(dir),
4131                 .pages = pages,
4132                 .pgbase = 0,
4133                 .count = count,
4134                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4135                 .plus = plus,
4136         };
4137         struct nfs4_readdir_res res;
4138         struct rpc_message msg = {
4139                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4140                 .rpc_argp = &args,
4141                 .rpc_resp = &res,
4142                 .rpc_cred = cred,
4143         };
4144         int                     status;
4145
4146         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4147                         dentry,
4148                         (unsigned long long)cookie);
4149         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4150         res.pgbase = args.pgbase;
4151         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4152         if (status >= 0) {
4153                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4154                 status += args.pgbase;
4155         }
4156
4157         nfs_invalidate_atime(dir);
4158
4159         dprintk("%s: returns %d\n", __func__, status);
4160         return status;
4161 }
4162
4163 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4164                 u64 cookie, struct page **pages, unsigned int count, int plus)
4165 {
4166         struct nfs4_exception exception = { };
4167         int err;
4168         do {
4169                 err = _nfs4_proc_readdir(dentry, cred, cookie,
4170                                 pages, count, plus);
4171                 trace_nfs4_readdir(d_inode(dentry), err);
4172                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4173                                 &exception);
4174         } while (exception.retry);
4175         return err;
4176 }
4177
4178 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4179                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4180 {
4181         struct nfs4_createdata *data;
4182         int mode = sattr->ia_mode;
4183         int status = -ENOMEM;
4184
4185         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
4186         if (data == NULL)
4187                 goto out;
4188
4189         if (S_ISFIFO(mode))
4190                 data->arg.ftype = NF4FIFO;
4191         else if (S_ISBLK(mode)) {
4192                 data->arg.ftype = NF4BLK;
4193                 data->arg.u.device.specdata1 = MAJOR(rdev);
4194                 data->arg.u.device.specdata2 = MINOR(rdev);
4195         }
4196         else if (S_ISCHR(mode)) {
4197                 data->arg.ftype = NF4CHR;
4198                 data->arg.u.device.specdata1 = MAJOR(rdev);
4199                 data->arg.u.device.specdata2 = MINOR(rdev);
4200         } else if (!S_ISSOCK(mode)) {
4201                 status = -EINVAL;
4202                 goto out_free;
4203         }
4204
4205         data->arg.label = label;
4206         status = nfs4_do_create(dir, dentry, data);
4207 out_free:
4208         nfs4_free_createdata(data);
4209 out:
4210         return status;
4211 }
4212
4213 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4214                 struct iattr *sattr, dev_t rdev)
4215 {
4216         struct nfs4_exception exception = { };
4217         struct nfs4_label l, *label = NULL;
4218         int err;
4219
4220         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4221
4222         sattr->ia_mode &= ~current_umask();
4223         do {
4224                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4225                 trace_nfs4_mknod(dir, &dentry->d_name, err);
4226                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4227                                 &exception);
4228         } while (exception.retry);
4229
4230         nfs4_label_release_security(label);
4231
4232         return err;
4233 }
4234
4235 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
4236                  struct nfs_fsstat *fsstat)
4237 {
4238         struct nfs4_statfs_arg args = {
4239                 .fh = fhandle,
4240                 .bitmask = server->attr_bitmask,
4241         };
4242         struct nfs4_statfs_res res = {
4243                 .fsstat = fsstat,
4244         };
4245         struct rpc_message msg = {
4246                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
4247                 .rpc_argp = &args,
4248                 .rpc_resp = &res,
4249         };
4250
4251         nfs_fattr_init(fsstat->fattr);
4252         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4253 }
4254
4255 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4256 {
4257         struct nfs4_exception exception = { };
4258         int err;
4259         do {
4260                 err = nfs4_handle_exception(server,
4261                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4262                                 &exception);
4263         } while (exception.retry);
4264         return err;
4265 }
4266
4267 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4268                 struct nfs_fsinfo *fsinfo)
4269 {
4270         struct nfs4_fsinfo_arg args = {
4271                 .fh = fhandle,
4272                 .bitmask = server->attr_bitmask,
4273         };
4274         struct nfs4_fsinfo_res res = {
4275                 .fsinfo = fsinfo,
4276         };
4277         struct rpc_message msg = {
4278                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4279                 .rpc_argp = &args,
4280                 .rpc_resp = &res,
4281         };
4282
4283         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4284 }
4285
4286 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4287 {
4288         struct nfs4_exception exception = { };
4289         unsigned long now = jiffies;
4290         int err;
4291
4292         do {
4293                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4294                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4295                 if (err == 0) {
4296                         nfs4_set_lease_period(server->nfs_client,
4297                                         fsinfo->lease_time * HZ,
4298                                         now);
4299                         break;
4300                 }
4301                 err = nfs4_handle_exception(server, err, &exception);
4302         } while (exception.retry);
4303         return err;
4304 }
4305
4306 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4307 {
4308         int error;
4309
4310         nfs_fattr_init(fsinfo->fattr);
4311         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4312         if (error == 0) {
4313                 /* block layout checks this! */
4314                 server->pnfs_blksize = fsinfo->blksize;
4315                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4316         }
4317
4318         return error;
4319 }
4320
4321 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4322                 struct nfs_pathconf *pathconf)
4323 {
4324         struct nfs4_pathconf_arg args = {
4325                 .fh = fhandle,
4326                 .bitmask = server->attr_bitmask,
4327         };
4328         struct nfs4_pathconf_res res = {
4329                 .pathconf = pathconf,
4330         };
4331         struct rpc_message msg = {
4332                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4333                 .rpc_argp = &args,
4334                 .rpc_resp = &res,
4335         };
4336
4337         /* None of the pathconf attributes are mandatory to implement */
4338         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4339                 memset(pathconf, 0, sizeof(*pathconf));
4340                 return 0;
4341         }
4342
4343         nfs_fattr_init(pathconf->fattr);
4344         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4345 }
4346
4347 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4348                 struct nfs_pathconf *pathconf)
4349 {
4350         struct nfs4_exception exception = { };
4351         int err;
4352
4353         do {
4354                 err = nfs4_handle_exception(server,
4355                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4356                                 &exception);
4357         } while (exception.retry);
4358         return err;
4359 }
4360
4361 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4362                 const struct nfs_open_context *ctx,
4363                 const struct nfs_lock_context *l_ctx,
4364                 fmode_t fmode)
4365 {
4366         const struct nfs_lockowner *lockowner = NULL;
4367
4368         if (l_ctx != NULL)
4369                 lockowner = &l_ctx->lockowner;
4370         return nfs4_select_rw_stateid(ctx->state, fmode, lockowner, stateid, NULL);
4371 }
4372 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4373
4374 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4375                 const struct nfs_open_context *ctx,
4376                 const struct nfs_lock_context *l_ctx,
4377                 fmode_t fmode)
4378 {
4379         nfs4_stateid current_stateid;
4380
4381         /* If the current stateid represents a lost lock, then exit */
4382         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4383                 return true;
4384         return nfs4_stateid_match(stateid, &current_stateid);
4385 }
4386
4387 static bool nfs4_error_stateid_expired(int err)
4388 {
4389         switch (err) {
4390         case -NFS4ERR_DELEG_REVOKED:
4391         case -NFS4ERR_ADMIN_REVOKED:
4392         case -NFS4ERR_BAD_STATEID:
4393         case -NFS4ERR_STALE_STATEID:
4394         case -NFS4ERR_OLD_STATEID:
4395         case -NFS4ERR_OPENMODE:
4396         case -NFS4ERR_EXPIRED:
4397                 return true;
4398         }
4399         return false;
4400 }
4401
4402 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4403 {
4404         nfs_invalidate_atime(hdr->inode);
4405 }
4406
4407 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4408 {
4409         struct nfs_server *server = NFS_SERVER(hdr->inode);
4410
4411         trace_nfs4_read(hdr, task->tk_status);
4412         if (nfs4_async_handle_error(task, server,
4413                                     hdr->args.context->state,
4414                                     NULL) == -EAGAIN) {
4415                 rpc_restart_call_prepare(task);
4416                 return -EAGAIN;
4417         }
4418
4419         __nfs4_read_done_cb(hdr);
4420         if (task->tk_status > 0)
4421                 renew_lease(server, hdr->timestamp);
4422         return 0;
4423 }
4424
4425 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4426                 struct nfs_pgio_args *args)
4427 {
4428
4429         if (!nfs4_error_stateid_expired(task->tk_status) ||
4430                 nfs4_stateid_is_current(&args->stateid,
4431                                 args->context,
4432                                 args->lock_context,
4433                                 FMODE_READ))
4434                 return false;
4435         rpc_restart_call_prepare(task);
4436         return true;
4437 }
4438
4439 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4440 {
4441
4442         dprintk("--> %s\n", __func__);
4443
4444         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4445                 return -EAGAIN;
4446         if (nfs4_read_stateid_changed(task, &hdr->args))
4447                 return -EAGAIN;
4448         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4449                                     nfs4_read_done_cb(task, hdr);
4450 }
4451
4452 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4453                                  struct rpc_message *msg)
4454 {
4455         hdr->timestamp   = jiffies;
4456         if (!hdr->pgio_done_cb)
4457                 hdr->pgio_done_cb = nfs4_read_done_cb;
4458         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4459         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4460 }
4461
4462 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4463                                       struct nfs_pgio_header *hdr)
4464 {
4465         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4466                         &hdr->args.seq_args,
4467                         &hdr->res.seq_res,
4468                         task))
4469                 return 0;
4470         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4471                                 hdr->args.lock_context,
4472                                 hdr->rw_ops->rw_mode) == -EIO)
4473                 return -EIO;
4474         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4475                 return -EIO;
4476         return 0;
4477 }
4478
4479 static int nfs4_write_done_cb(struct rpc_task *task,
4480                               struct nfs_pgio_header *hdr)
4481 {
4482         struct inode *inode = hdr->inode;
4483
4484         trace_nfs4_write(hdr, task->tk_status);
4485         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4486                                     hdr->args.context->state,
4487                                     NULL) == -EAGAIN) {
4488                 rpc_restart_call_prepare(task);
4489                 return -EAGAIN;
4490         }
4491         if (task->tk_status >= 0) {
4492                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4493                 nfs_writeback_update_inode(hdr);
4494         }
4495         return 0;
4496 }
4497
4498 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4499                 struct nfs_pgio_args *args)
4500 {
4501
4502         if (!nfs4_error_stateid_expired(task->tk_status) ||
4503                 nfs4_stateid_is_current(&args->stateid,
4504                                 args->context,
4505                                 args->lock_context,
4506                                 FMODE_WRITE))
4507                 return false;
4508         rpc_restart_call_prepare(task);
4509         return true;
4510 }
4511
4512 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4513 {
4514         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4515                 return -EAGAIN;
4516         if (nfs4_write_stateid_changed(task, &hdr->args))
4517                 return -EAGAIN;
4518         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4519                 nfs4_write_done_cb(task, hdr);
4520 }
4521
4522 static
4523 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4524 {
4525         /* Don't request attributes for pNFS or O_DIRECT writes */
4526         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4527                 return false;
4528         /* Otherwise, request attributes if and only if we don't hold
4529          * a delegation
4530          */
4531         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4532 }
4533
4534 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4535                                   struct rpc_message *msg)
4536 {
4537         struct nfs_server *server = NFS_SERVER(hdr->inode);
4538
4539         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4540                 hdr->args.bitmask = NULL;
4541                 hdr->res.fattr = NULL;
4542         } else
4543                 hdr->args.bitmask = server->cache_consistency_bitmask;
4544
4545         if (!hdr->pgio_done_cb)
4546                 hdr->pgio_done_cb = nfs4_write_done_cb;
4547         hdr->res.server = server;
4548         hdr->timestamp   = jiffies;
4549
4550         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4551         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4552 }
4553
4554 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4555 {
4556         nfs4_setup_sequence(NFS_SERVER(data->inode),
4557                         &data->args.seq_args,
4558                         &data->res.seq_res,
4559                         task);
4560 }
4561
4562 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4563 {
4564         struct inode *inode = data->inode;
4565
4566         trace_nfs4_commit(data, task->tk_status);
4567         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4568                                     NULL, NULL) == -EAGAIN) {
4569                 rpc_restart_call_prepare(task);
4570                 return -EAGAIN;
4571         }
4572         return 0;
4573 }
4574
4575 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4576 {
4577         if (!nfs4_sequence_done(task, &data->res.seq_res))
4578                 return -EAGAIN;
4579         return data->commit_done_cb(task, data);
4580 }
4581
4582 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4583 {
4584         struct nfs_server *server = NFS_SERVER(data->inode);
4585
4586         if (data->commit_done_cb == NULL)
4587                 data->commit_done_cb = nfs4_commit_done_cb;
4588         data->res.server = server;
4589         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4590         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4591 }
4592
4593 struct nfs4_renewdata {
4594         struct nfs_client       *client;
4595         unsigned long           timestamp;
4596 };
4597
4598 /*
4599  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4600  * standalone procedure for queueing an asynchronous RENEW.
4601  */
4602 static void nfs4_renew_release(void *calldata)
4603 {
4604         struct nfs4_renewdata *data = calldata;
4605         struct nfs_client *clp = data->client;
4606
4607         if (atomic_read(&clp->cl_count) > 1)
4608                 nfs4_schedule_state_renewal(clp);
4609         nfs_put_client(clp);
4610         kfree(data);
4611 }
4612
4613 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4614 {
4615         struct nfs4_renewdata *data = calldata;
4616         struct nfs_client *clp = data->client;
4617         unsigned long timestamp = data->timestamp;
4618
4619         trace_nfs4_renew_async(clp, task->tk_status);
4620         switch (task->tk_status) {
4621         case 0:
4622                 break;
4623         case -NFS4ERR_LEASE_MOVED:
4624                 nfs4_schedule_lease_moved_recovery(clp);
4625                 break;
4626         default:
4627                 /* Unless we're shutting down, schedule state recovery! */
4628                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4629                         return;
4630                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4631                         nfs4_schedule_lease_recovery(clp);
4632                         return;
4633                 }
4634                 nfs4_schedule_path_down_recovery(clp);
4635         }
4636         do_renew_lease(clp, timestamp);
4637 }
4638
4639 static const struct rpc_call_ops nfs4_renew_ops = {
4640         .rpc_call_done = nfs4_renew_done,
4641         .rpc_release = nfs4_renew_release,
4642 };
4643
4644 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4645 {
4646         struct rpc_message msg = {
4647                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4648                 .rpc_argp       = clp,
4649                 .rpc_cred       = cred,
4650         };
4651         struct nfs4_renewdata *data;
4652
4653         if (renew_flags == 0)
4654                 return 0;
4655         if (!atomic_inc_not_zero(&clp->cl_count))
4656                 return -EIO;
4657         data = kmalloc(sizeof(*data), GFP_NOFS);
4658         if (data == NULL)
4659                 return -ENOMEM;
4660         data->client = clp;
4661         data->timestamp = jiffies;
4662         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4663                         &nfs4_renew_ops, data);
4664 }
4665
4666 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4667 {
4668         struct rpc_message msg = {
4669                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4670                 .rpc_argp       = clp,
4671                 .rpc_cred       = cred,
4672         };
4673         unsigned long now = jiffies;
4674         int status;
4675
4676         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4677         if (status < 0)
4678                 return status;
4679         do_renew_lease(clp, now);
4680         return 0;
4681 }
4682
4683 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4684 {
4685         return server->caps & NFS_CAP_ACLS;
4686 }
4687
4688 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4689  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4690  * the stack.
4691  */
4692 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4693
4694 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4695                 struct page **pages)
4696 {
4697         struct page *newpage, **spages;
4698         int rc = 0;
4699         size_t len;
4700         spages = pages;
4701
4702         do {
4703                 len = min_t(size_t, PAGE_SIZE, buflen);
4704                 newpage = alloc_page(GFP_KERNEL);
4705
4706                 if (newpage == NULL)
4707                         goto unwind;
4708                 memcpy(page_address(newpage), buf, len);
4709                 buf += len;
4710                 buflen -= len;
4711                 *pages++ = newpage;
4712                 rc++;
4713         } while (buflen != 0);
4714
4715         return rc;
4716
4717 unwind:
4718         for(; rc > 0; rc--)
4719                 __free_page(spages[rc-1]);
4720         return -ENOMEM;
4721 }
4722
4723 struct nfs4_cached_acl {
4724         int cached;
4725         size_t len;
4726         char data[0];
4727 };
4728
4729 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4730 {
4731         struct nfs_inode *nfsi = NFS_I(inode);
4732
4733         spin_lock(&inode->i_lock);
4734         kfree(nfsi->nfs4_acl);
4735         nfsi->nfs4_acl = acl;
4736         spin_unlock(&inode->i_lock);
4737 }
4738
4739 static void nfs4_zap_acl_attr(struct inode *inode)
4740 {
4741         nfs4_set_cached_acl(inode, NULL);
4742 }
4743
4744 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4745 {
4746         struct nfs_inode *nfsi = NFS_I(inode);
4747         struct nfs4_cached_acl *acl;
4748         int ret = -ENOENT;
4749
4750         spin_lock(&inode->i_lock);
4751         acl = nfsi->nfs4_acl;
4752         if (acl == NULL)
4753                 goto out;
4754         if (buf == NULL) /* user is just asking for length */
4755                 goto out_len;
4756         if (acl->cached == 0)
4757                 goto out;
4758         ret = -ERANGE; /* see getxattr(2) man page */
4759         if (acl->len > buflen)
4760                 goto out;
4761         memcpy(buf, acl->data, acl->len);
4762 out_len:
4763         ret = acl->len;
4764 out:
4765         spin_unlock(&inode->i_lock);
4766         return ret;
4767 }
4768
4769 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4770 {
4771         struct nfs4_cached_acl *acl;
4772         size_t buflen = sizeof(*acl) + acl_len;
4773
4774         if (buflen <= PAGE_SIZE) {
4775                 acl = kmalloc(buflen, GFP_KERNEL);
4776                 if (acl == NULL)
4777                         goto out;
4778                 acl->cached = 1;
4779                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4780         } else {
4781                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4782                 if (acl == NULL)
4783                         goto out;
4784                 acl->cached = 0;
4785         }
4786         acl->len = acl_len;
4787 out:
4788         nfs4_set_cached_acl(inode, acl);
4789 }
4790
4791 /*
4792  * The getxattr API returns the required buffer length when called with a
4793  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4794  * the required buf.  On a NULL buf, we send a page of data to the server
4795  * guessing that the ACL request can be serviced by a page. If so, we cache
4796  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4797  * the cache. If not so, we throw away the page, and cache the required
4798  * length. The next getxattr call will then produce another round trip to
4799  * the server, this time with the input buf of the required size.
4800  */
4801 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4802 {
4803         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4804         struct nfs_getaclargs args = {
4805                 .fh = NFS_FH(inode),
4806                 .acl_pages = pages,
4807                 .acl_len = buflen,
4808         };
4809         struct nfs_getaclres res = {
4810                 .acl_len = buflen,
4811         };
4812         struct rpc_message msg = {
4813                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4814                 .rpc_argp = &args,
4815                 .rpc_resp = &res,
4816         };
4817         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4818         int ret = -ENOMEM, i;
4819
4820         /* As long as we're doing a round trip to the server anyway,
4821          * let's be prepared for a page of acl data. */
4822         if (npages == 0)
4823                 npages = 1;
4824         if (npages > ARRAY_SIZE(pages))
4825                 return -ERANGE;
4826
4827         for (i = 0; i < npages; i++) {
4828                 pages[i] = alloc_page(GFP_KERNEL);
4829                 if (!pages[i])
4830                         goto out_free;
4831         }
4832
4833         /* for decoding across pages */
4834         res.acl_scratch = alloc_page(GFP_KERNEL);
4835         if (!res.acl_scratch)
4836                 goto out_free;
4837
4838         args.acl_len = npages * PAGE_SIZE;
4839
4840         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4841                 __func__, buf, buflen, npages, args.acl_len);
4842         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4843                              &msg, &args.seq_args, &res.seq_res, 0);
4844         if (ret)
4845                 goto out_free;
4846
4847         /* Handle the case where the passed-in buffer is too short */
4848         if (res.acl_flags & NFS4_ACL_TRUNC) {
4849                 /* Did the user only issue a request for the acl length? */
4850                 if (buf == NULL)
4851                         goto out_ok;
4852                 ret = -ERANGE;
4853                 goto out_free;
4854         }
4855         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4856         if (buf) {
4857                 if (res.acl_len > buflen) {
4858                         ret = -ERANGE;
4859                         goto out_free;
4860                 }
4861                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4862         }
4863 out_ok:
4864         ret = res.acl_len;
4865 out_free:
4866         for (i = 0; i < npages; i++)
4867                 if (pages[i])
4868                         __free_page(pages[i]);
4869         if (res.acl_scratch)
4870                 __free_page(res.acl_scratch);
4871         return ret;
4872 }
4873
4874 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4875 {
4876         struct nfs4_exception exception = { };
4877         ssize_t ret;
4878         do {
4879                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4880                 trace_nfs4_get_acl(inode, ret);
4881                 if (ret >= 0)
4882                         break;
4883                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4884         } while (exception.retry);
4885         return ret;
4886 }
4887
4888 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4889 {
4890         struct nfs_server *server = NFS_SERVER(inode);
4891         int ret;
4892
4893         if (!nfs4_server_supports_acls(server))
4894                 return -EOPNOTSUPP;
4895         ret = nfs_revalidate_inode(server, inode);
4896         if (ret < 0)
4897                 return ret;
4898         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4899                 nfs_zap_acl_cache(inode);
4900         ret = nfs4_read_cached_acl(inode, buf, buflen);
4901         if (ret != -ENOENT)
4902                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4903                  * but no cached acl data, just the acl length */
4904                 return ret;
4905         return nfs4_get_acl_uncached(inode, buf, buflen);
4906 }
4907
4908 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4909 {
4910         struct nfs_server *server = NFS_SERVER(inode);
4911         struct page *pages[NFS4ACL_MAXPAGES];
4912         struct nfs_setaclargs arg = {
4913                 .fh             = NFS_FH(inode),
4914                 .acl_pages      = pages,
4915                 .acl_len        = buflen,
4916         };
4917         struct nfs_setaclres res;
4918         struct rpc_message msg = {
4919                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4920                 .rpc_argp       = &arg,
4921                 .rpc_resp       = &res,
4922         };
4923         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4924         int ret, i;
4925
4926         if (!nfs4_server_supports_acls(server))
4927                 return -EOPNOTSUPP;
4928         if (npages > ARRAY_SIZE(pages))
4929                 return -ERANGE;
4930         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
4931         if (i < 0)
4932                 return i;
4933         nfs4_inode_return_delegation(inode);
4934         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4935
4936         /*
4937          * Free each page after tx, so the only ref left is
4938          * held by the network stack
4939          */
4940         for (; i > 0; i--)
4941                 put_page(pages[i-1]);
4942
4943         /*
4944          * Acl update can result in inode attribute update.
4945          * so mark the attribute cache invalid.
4946          */
4947         spin_lock(&inode->i_lock);
4948         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4949         spin_unlock(&inode->i_lock);
4950         nfs_access_zap_cache(inode);
4951         nfs_zap_acl_cache(inode);
4952         return ret;
4953 }
4954
4955 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4956 {
4957         struct nfs4_exception exception = { };
4958         int err;
4959         do {
4960                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4961                 trace_nfs4_set_acl(inode, err);
4962                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4963                                 &exception);
4964         } while (exception.retry);
4965         return err;
4966 }
4967
4968 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4969 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4970                                         size_t buflen)
4971 {
4972         struct nfs_server *server = NFS_SERVER(inode);
4973         struct nfs_fattr fattr;
4974         struct nfs4_label label = {0, 0, buflen, buf};
4975
4976         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4977         struct nfs4_getattr_arg arg = {
4978                 .fh             = NFS_FH(inode),
4979                 .bitmask        = bitmask,
4980         };
4981         struct nfs4_getattr_res res = {
4982                 .fattr          = &fattr,
4983                 .label          = &label,
4984                 .server         = server,
4985         };
4986         struct rpc_message msg = {
4987                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4988                 .rpc_argp       = &arg,
4989                 .rpc_resp       = &res,
4990         };
4991         int ret;
4992
4993         nfs_fattr_init(&fattr);
4994
4995         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4996         if (ret)
4997                 return ret;
4998         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4999                 return -ENOENT;
5000         if (buflen < label.len)
5001                 return -ERANGE;
5002         return 0;
5003 }
5004
5005 static int nfs4_get_security_label(struct inode *inode, void *buf,
5006                                         size_t buflen)
5007 {
5008         struct nfs4_exception exception = { };
5009         int err;
5010
5011         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5012                 return -EOPNOTSUPP;
5013
5014         do {
5015                 err = _nfs4_get_security_label(inode, buf, buflen);
5016                 trace_nfs4_get_security_label(inode, err);
5017                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5018                                 &exception);
5019         } while (exception.retry);
5020         return err;
5021 }
5022
5023 static int _nfs4_do_set_security_label(struct inode *inode,
5024                 struct nfs4_label *ilabel,
5025                 struct nfs_fattr *fattr,
5026                 struct nfs4_label *olabel)
5027 {
5028
5029         struct iattr sattr = {0};
5030         struct nfs_server *server = NFS_SERVER(inode);
5031         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5032         struct nfs_setattrargs arg = {
5033                 .fh             = NFS_FH(inode),
5034                 .iap            = &sattr,
5035                 .server         = server,
5036                 .bitmask        = bitmask,
5037                 .label          = ilabel,
5038         };
5039         struct nfs_setattrres res = {
5040                 .fattr          = fattr,
5041                 .label          = olabel,
5042                 .server         = server,
5043         };
5044         struct rpc_message msg = {
5045                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
5046                 .rpc_argp       = &arg,
5047                 .rpc_resp       = &res,
5048         };
5049         int status;
5050
5051         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
5052
5053         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5054         if (status)
5055                 dprintk("%s failed: %d\n", __func__, status);
5056
5057         return status;
5058 }
5059
5060 static int nfs4_do_set_security_label(struct inode *inode,
5061                 struct nfs4_label *ilabel,
5062                 struct nfs_fattr *fattr,
5063                 struct nfs4_label *olabel)
5064 {
5065         struct nfs4_exception exception = { };
5066         int err;
5067
5068         do {
5069                 err = _nfs4_do_set_security_label(inode, ilabel,
5070                                 fattr, olabel);
5071                 trace_nfs4_set_security_label(inode, err);
5072                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5073                                 &exception);
5074         } while (exception.retry);
5075         return err;
5076 }
5077
5078 static int
5079 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
5080 {
5081         struct nfs4_label ilabel, *olabel = NULL;
5082         struct nfs_fattr fattr;
5083         struct rpc_cred *cred;
5084         int status;
5085
5086         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5087                 return -EOPNOTSUPP;
5088
5089         nfs_fattr_init(&fattr);
5090
5091         ilabel.pi = 0;
5092         ilabel.lfs = 0;
5093         ilabel.label = (char *)buf;
5094         ilabel.len = buflen;
5095
5096         cred = rpc_lookup_cred();
5097         if (IS_ERR(cred))
5098                 return PTR_ERR(cred);
5099
5100         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5101         if (IS_ERR(olabel)) {
5102                 status = -PTR_ERR(olabel);
5103                 goto out;
5104         }
5105
5106         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5107         if (status == 0)
5108                 nfs_setsecurity(inode, &fattr, olabel);
5109
5110         nfs4_label_free(olabel);
5111 out:
5112         put_rpccred(cred);
5113         return status;
5114 }
5115 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
5116
5117
5118 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5119                                     nfs4_verifier *bootverf)
5120 {
5121         __be32 verf[2];
5122
5123         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5124                 /* An impossible timestamp guarantees this value
5125                  * will never match a generated boot time. */
5126                 verf[0] = 0;
5127                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
5128         } else {
5129                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5130                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
5131                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
5132         }
5133         memcpy(bootverf->data, verf, sizeof(bootverf->data));
5134 }
5135
5136 static int
5137 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
5138 {
5139         size_t len;
5140         char *str;
5141
5142         if (clp->cl_owner_id != NULL)
5143                 return 0;
5144
5145         rcu_read_lock();
5146         len = 14 + strlen(clp->cl_ipaddr) + 1 +
5147                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5148                 1 +
5149                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) +
5150                 1;
5151         rcu_read_unlock();
5152
5153         if (len > NFS4_OPAQUE_LIMIT + 1)
5154                 return -EINVAL;
5155
5156         /*
5157          * Since this string is allocated at mount time, and held until the
5158          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5159          * about a memory-reclaim deadlock.
5160          */
5161         str = kmalloc(len, GFP_KERNEL);
5162         if (!str)
5163                 return -ENOMEM;
5164
5165         rcu_read_lock();
5166         scnprintf(str, len, "Linux NFSv4.0 %s/%s %s",
5167                         clp->cl_ipaddr,
5168                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
5169                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO));
5170         rcu_read_unlock();
5171
5172         clp->cl_owner_id = str;
5173         return 0;
5174 }
5175
5176 static int
5177 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
5178 {
5179         size_t len;
5180         char *str;
5181
5182         len = 10 + 10 + 1 + 10 + 1 +
5183                 strlen(nfs4_client_id_uniquifier) + 1 +
5184                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5185
5186         if (len > NFS4_OPAQUE_LIMIT + 1)
5187                 return -EINVAL;
5188
5189         /*
5190          * Since this string is allocated at mount time, and held until the
5191          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5192          * about a memory-reclaim deadlock.
5193          */
5194         str = kmalloc(len, GFP_KERNEL);
5195         if (!str)
5196                 return -ENOMEM;
5197
5198         scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
5199                         clp->rpc_ops->version, clp->cl_minorversion,
5200                         nfs4_client_id_uniquifier,
5201                         clp->cl_rpcclient->cl_nodename);
5202         clp->cl_owner_id = str;
5203         return 0;
5204 }
5205
5206 static int
5207 nfs4_init_uniform_client_string(struct nfs_client *clp)
5208 {
5209         size_t len;
5210         char *str;
5211
5212         if (clp->cl_owner_id != NULL)
5213                 return 0;
5214
5215         if (nfs4_client_id_uniquifier[0] != '\0')
5216                 return nfs4_init_uniquifier_client_string(clp);
5217
5218         len = 10 + 10 + 1 + 10 + 1 +
5219                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5220
5221         if (len > NFS4_OPAQUE_LIMIT + 1)
5222                 return -EINVAL;
5223
5224         /*
5225          * Since this string is allocated at mount time, and held until the
5226          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5227          * about a memory-reclaim deadlock.
5228          */
5229         str = kmalloc(len, GFP_KERNEL);
5230         if (!str)
5231                 return -ENOMEM;
5232
5233         scnprintf(str, len, "Linux NFSv%u.%u %s",
5234                         clp->rpc_ops->version, clp->cl_minorversion,
5235                         clp->cl_rpcclient->cl_nodename);
5236         clp->cl_owner_id = str;
5237         return 0;
5238 }
5239
5240 /*
5241  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5242  * services.  Advertise one based on the address family of the
5243  * clientaddr.
5244  */
5245 static unsigned int
5246 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5247 {
5248         if (strchr(clp->cl_ipaddr, ':') != NULL)
5249                 return scnprintf(buf, len, "tcp6");
5250         else
5251                 return scnprintf(buf, len, "tcp");
5252 }
5253
5254 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5255 {
5256         struct nfs4_setclientid *sc = calldata;
5257
5258         if (task->tk_status == 0)
5259                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5260 }
5261
5262 static const struct rpc_call_ops nfs4_setclientid_ops = {
5263         .rpc_call_done = nfs4_setclientid_done,
5264 };
5265
5266 /**
5267  * nfs4_proc_setclientid - Negotiate client ID
5268  * @clp: state data structure
5269  * @program: RPC program for NFSv4 callback service
5270  * @port: IP port number for NFS4 callback service
5271  * @cred: RPC credential to use for this call
5272  * @res: where to place the result
5273  *
5274  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5275  */
5276 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5277                 unsigned short port, struct rpc_cred *cred,
5278                 struct nfs4_setclientid_res *res)
5279 {
5280         nfs4_verifier sc_verifier;
5281         struct nfs4_setclientid setclientid = {
5282                 .sc_verifier = &sc_verifier,
5283                 .sc_prog = program,
5284                 .sc_clnt = clp,
5285         };
5286         struct rpc_message msg = {
5287                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5288                 .rpc_argp = &setclientid,
5289                 .rpc_resp = res,
5290                 .rpc_cred = cred,
5291         };
5292         struct rpc_task *task;
5293         struct rpc_task_setup task_setup_data = {
5294                 .rpc_client = clp->cl_rpcclient,
5295                 .rpc_message = &msg,
5296                 .callback_ops = &nfs4_setclientid_ops,
5297                 .callback_data = &setclientid,
5298                 .flags = RPC_TASK_TIMEOUT,
5299         };
5300         int status;
5301
5302         /* nfs_client_id4 */
5303         nfs4_init_boot_verifier(clp, &sc_verifier);
5304
5305         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5306                 status = nfs4_init_uniform_client_string(clp);
5307         else
5308                 status = nfs4_init_nonuniform_client_string(clp);
5309
5310         if (status)
5311                 goto out;
5312
5313         /* cb_client4 */
5314         setclientid.sc_netid_len =
5315                                 nfs4_init_callback_netid(clp,
5316                                                 setclientid.sc_netid,
5317                                                 sizeof(setclientid.sc_netid));
5318         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5319                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5320                                 clp->cl_ipaddr, port >> 8, port & 255);
5321
5322         dprintk("NFS call  setclientid auth=%s, '%s'\n",
5323                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5324                 clp->cl_owner_id);
5325         task = rpc_run_task(&task_setup_data);
5326         if (IS_ERR(task)) {
5327                 status = PTR_ERR(task);
5328                 goto out;
5329         }
5330         status = task->tk_status;
5331         if (setclientid.sc_cred) {
5332                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5333                 put_rpccred(setclientid.sc_cred);
5334         }
5335         rpc_put_task(task);
5336 out:
5337         trace_nfs4_setclientid(clp, status);
5338         dprintk("NFS reply setclientid: %d\n", status);
5339         return status;
5340 }
5341
5342 /**
5343  * nfs4_proc_setclientid_confirm - Confirm client ID
5344  * @clp: state data structure
5345  * @res: result of a previous SETCLIENTID
5346  * @cred: RPC credential to use for this call
5347  *
5348  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5349  */
5350 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5351                 struct nfs4_setclientid_res *arg,
5352                 struct rpc_cred *cred)
5353 {
5354         struct rpc_message msg = {
5355                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5356                 .rpc_argp = arg,
5357                 .rpc_cred = cred,
5358         };
5359         int status;
5360
5361         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5362                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5363                 clp->cl_clientid);
5364         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5365         trace_nfs4_setclientid_confirm(clp, status);
5366         dprintk("NFS reply setclientid_confirm: %d\n", status);
5367         return status;
5368 }
5369
5370 struct nfs4_delegreturndata {
5371         struct nfs4_delegreturnargs args;
5372         struct nfs4_delegreturnres res;
5373         struct nfs_fh fh;
5374         nfs4_stateid stateid;
5375         unsigned long timestamp;
5376         struct nfs_fattr fattr;
5377         int rpc_status;
5378         struct inode *inode;
5379         bool roc;
5380         u32 roc_barrier;
5381 };
5382
5383 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5384 {
5385         struct nfs4_delegreturndata *data = calldata;
5386
5387         if (!nfs4_sequence_done(task, &data->res.seq_res))
5388                 return;
5389
5390         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5391         switch (task->tk_status) {
5392         case 0:
5393                 renew_lease(data->res.server, data->timestamp);
5394         case -NFS4ERR_ADMIN_REVOKED:
5395         case -NFS4ERR_DELEG_REVOKED:
5396         case -NFS4ERR_BAD_STATEID:
5397         case -NFS4ERR_OLD_STATEID:
5398         case -NFS4ERR_STALE_STATEID:
5399         case -NFS4ERR_EXPIRED:
5400                 task->tk_status = 0;
5401                 if (data->roc)
5402                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5403                 break;
5404         default:
5405                 if (nfs4_async_handle_error(task, data->res.server,
5406                                             NULL, NULL) == -EAGAIN) {
5407                         rpc_restart_call_prepare(task);
5408                         return;
5409                 }
5410         }
5411         data->rpc_status = task->tk_status;
5412 }
5413
5414 static void nfs4_delegreturn_release(void *calldata)
5415 {
5416         struct nfs4_delegreturndata *data = calldata;
5417         struct inode *inode = data->inode;
5418
5419         if (inode) {
5420                 if (data->roc)
5421                         pnfs_roc_release(inode);
5422                 nfs_iput_and_deactive(inode);
5423         }
5424         kfree(calldata);
5425 }
5426
5427 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5428 {
5429         struct nfs4_delegreturndata *d_data;
5430
5431         d_data = (struct nfs4_delegreturndata *)data;
5432
5433         if (nfs4_wait_on_layoutreturn(d_data->inode, task))
5434                 return;
5435
5436         if (d_data->roc)
5437                 pnfs_roc_get_barrier(d_data->inode, &d_data->roc_barrier);
5438
5439         nfs4_setup_sequence(d_data->res.server,
5440                         &d_data->args.seq_args,
5441                         &d_data->res.seq_res,
5442                         task);
5443 }
5444
5445 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5446         .rpc_call_prepare = nfs4_delegreturn_prepare,
5447         .rpc_call_done = nfs4_delegreturn_done,
5448         .rpc_release = nfs4_delegreturn_release,
5449 };
5450
5451 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5452 {
5453         struct nfs4_delegreturndata *data;
5454         struct nfs_server *server = NFS_SERVER(inode);
5455         struct rpc_task *task;
5456         struct rpc_message msg = {
5457                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5458                 .rpc_cred = cred,
5459         };
5460         struct rpc_task_setup task_setup_data = {
5461                 .rpc_client = server->client,
5462                 .rpc_message = &msg,
5463                 .callback_ops = &nfs4_delegreturn_ops,
5464                 .flags = RPC_TASK_ASYNC,
5465         };
5466         int status = 0;
5467
5468         data = kzalloc(sizeof(*data), GFP_NOFS);
5469         if (data == NULL)
5470                 return -ENOMEM;
5471         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5472
5473         nfs4_state_protect(server->nfs_client,
5474                         NFS_SP4_MACH_CRED_CLEANUP,
5475                         &task_setup_data.rpc_client, &msg);
5476
5477         data->args.fhandle = &data->fh;
5478         data->args.stateid = &data->stateid;
5479         data->args.bitmask = server->cache_consistency_bitmask;
5480         nfs_copy_fh(&data->fh, NFS_FH(inode));
5481         nfs4_stateid_copy(&data->stateid, stateid);
5482         data->res.fattr = &data->fattr;
5483         data->res.server = server;
5484         nfs_fattr_init(data->res.fattr);
5485         data->timestamp = jiffies;
5486         data->rpc_status = 0;
5487         data->inode = nfs_igrab_and_active(inode);
5488         if (data->inode)
5489                 data->roc = nfs4_roc(inode);
5490
5491         task_setup_data.callback_data = data;
5492         msg.rpc_argp = &data->args;
5493         msg.rpc_resp = &data->res;
5494         task = rpc_run_task(&task_setup_data);
5495         if (IS_ERR(task))
5496                 return PTR_ERR(task);
5497         if (!issync)
5498                 goto out;
5499         status = nfs4_wait_for_completion_rpc_task(task);
5500         if (status != 0)
5501                 goto out;
5502         status = data->rpc_status;
5503         if (status == 0)
5504                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5505         else
5506                 nfs_refresh_inode(inode, &data->fattr);
5507 out:
5508         rpc_put_task(task);
5509         return status;
5510 }
5511
5512 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5513 {
5514         struct nfs_server *server = NFS_SERVER(inode);
5515         struct nfs4_exception exception = { };
5516         int err;
5517         do {
5518                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5519                 trace_nfs4_delegreturn(inode, stateid, err);
5520                 switch (err) {
5521                         case -NFS4ERR_STALE_STATEID:
5522                         case -NFS4ERR_EXPIRED:
5523                         case 0:
5524                                 return 0;
5525                 }
5526                 err = nfs4_handle_exception(server, err, &exception);
5527         } while (exception.retry);
5528         return err;
5529 }
5530
5531 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5532 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5533
5534 /*
5535  * sleep, with exponential backoff, and retry the LOCK operation.
5536  */
5537 static unsigned long
5538 nfs4_set_lock_task_retry(unsigned long timeout)
5539 {
5540         freezable_schedule_timeout_killable_unsafe(timeout);
5541         timeout <<= 1;
5542         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5543                 return NFS4_LOCK_MAXTIMEOUT;
5544         return timeout;
5545 }
5546
5547 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5548 {
5549         struct inode *inode = state->inode;
5550         struct nfs_server *server = NFS_SERVER(inode);
5551         struct nfs_client *clp = server->nfs_client;
5552         struct nfs_lockt_args arg = {
5553                 .fh = NFS_FH(inode),
5554                 .fl = request,
5555         };
5556         struct nfs_lockt_res res = {
5557                 .denied = request,
5558         };
5559         struct rpc_message msg = {
5560                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5561                 .rpc_argp       = &arg,
5562                 .rpc_resp       = &res,
5563                 .rpc_cred       = state->owner->so_cred,
5564         };
5565         struct nfs4_lock_state *lsp;
5566         int status;
5567
5568         arg.lock_owner.clientid = clp->cl_clientid;
5569         status = nfs4_set_lock_state(state, request);
5570         if (status != 0)
5571                 goto out;
5572         lsp = request->fl_u.nfs4_fl.owner;
5573         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5574         arg.lock_owner.s_dev = server->s_dev;
5575         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5576         switch (status) {
5577                 case 0:
5578                         request->fl_type = F_UNLCK;
5579                         break;
5580                 case -NFS4ERR_DENIED:
5581                         status = 0;
5582         }
5583         request->fl_ops->fl_release_private(request);
5584         request->fl_ops = NULL;
5585 out:
5586         return status;
5587 }
5588
5589 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5590 {
5591         struct nfs4_exception exception = { };
5592         int err;
5593
5594         do {
5595                 err = _nfs4_proc_getlk(state, cmd, request);
5596                 trace_nfs4_get_lock(request, state, cmd, err);
5597                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5598                                 &exception);
5599         } while (exception.retry);
5600         return err;
5601 }
5602
5603 static int do_vfs_lock(struct inode *inode, struct file_lock *fl)
5604 {
5605         return locks_lock_inode_wait(inode, fl);
5606 }
5607
5608 struct nfs4_unlockdata {
5609         struct nfs_locku_args arg;
5610         struct nfs_locku_res res;
5611         struct nfs4_lock_state *lsp;
5612         struct nfs_open_context *ctx;
5613         struct file_lock fl;
5614         struct nfs_server *server;
5615         unsigned long timestamp;
5616 };
5617
5618 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5619                 struct nfs_open_context *ctx,
5620                 struct nfs4_lock_state *lsp,
5621                 struct nfs_seqid *seqid)
5622 {
5623         struct nfs4_unlockdata *p;
5624         struct inode *inode = lsp->ls_state->inode;
5625
5626         p = kzalloc(sizeof(*p), GFP_NOFS);
5627         if (p == NULL)
5628                 return NULL;
5629         p->arg.fh = NFS_FH(inode);
5630         p->arg.fl = &p->fl;
5631         p->arg.seqid = seqid;
5632         p->res.seqid = seqid;
5633         p->lsp = lsp;
5634         atomic_inc(&lsp->ls_count);
5635         /* Ensure we don't close file until we're done freeing locks! */
5636         p->ctx = get_nfs_open_context(ctx);
5637         memcpy(&p->fl, fl, sizeof(p->fl));
5638         p->server = NFS_SERVER(inode);
5639         return p;
5640 }
5641
5642 static void nfs4_locku_release_calldata(void *data)
5643 {
5644         struct nfs4_unlockdata *calldata = data;
5645         nfs_free_seqid(calldata->arg.seqid);
5646         nfs4_put_lock_state(calldata->lsp);
5647         put_nfs_open_context(calldata->ctx);
5648         kfree(calldata);
5649 }
5650
5651 static void nfs4_locku_done(struct rpc_task *task, void *data)
5652 {
5653         struct nfs4_unlockdata *calldata = data;
5654
5655         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5656                 return;
5657         switch (task->tk_status) {
5658                 case 0:
5659                         renew_lease(calldata->server, calldata->timestamp);
5660                         do_vfs_lock(calldata->lsp->ls_state->inode, &calldata->fl);
5661                         if (nfs4_update_lock_stateid(calldata->lsp,
5662                                         &calldata->res.stateid))
5663                                 break;
5664                 case -NFS4ERR_BAD_STATEID:
5665                 case -NFS4ERR_OLD_STATEID:
5666                 case -NFS4ERR_STALE_STATEID:
5667                 case -NFS4ERR_EXPIRED:
5668                         if (!nfs4_stateid_match(&calldata->arg.stateid,
5669                                                 &calldata->lsp->ls_stateid))
5670                                 rpc_restart_call_prepare(task);
5671                         break;
5672                 default:
5673                         if (nfs4_async_handle_error(task, calldata->server,
5674                                                     NULL, NULL) == -EAGAIN)
5675                                 rpc_restart_call_prepare(task);
5676         }
5677         nfs_release_seqid(calldata->arg.seqid);
5678 }
5679
5680 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5681 {
5682         struct nfs4_unlockdata *calldata = data;
5683
5684         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5685                 goto out_wait;
5686         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5687         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5688                 /* Note: exit _without_ running nfs4_locku_done */
5689                 goto out_no_action;
5690         }
5691         calldata->timestamp = jiffies;
5692         if (nfs4_setup_sequence(calldata->server,
5693                                 &calldata->arg.seq_args,
5694                                 &calldata->res.seq_res,
5695                                 task) != 0)
5696                 nfs_release_seqid(calldata->arg.seqid);
5697         return;
5698 out_no_action:
5699         task->tk_action = NULL;
5700 out_wait:
5701         nfs4_sequence_done(task, &calldata->res.seq_res);
5702 }
5703
5704 static const struct rpc_call_ops nfs4_locku_ops = {
5705         .rpc_call_prepare = nfs4_locku_prepare,
5706         .rpc_call_done = nfs4_locku_done,
5707         .rpc_release = nfs4_locku_release_calldata,
5708 };
5709
5710 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5711                 struct nfs_open_context *ctx,
5712                 struct nfs4_lock_state *lsp,
5713                 struct nfs_seqid *seqid)
5714 {
5715         struct nfs4_unlockdata *data;
5716         struct rpc_message msg = {
5717                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5718                 .rpc_cred = ctx->cred,
5719         };
5720         struct rpc_task_setup task_setup_data = {
5721                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5722                 .rpc_message = &msg,
5723                 .callback_ops = &nfs4_locku_ops,
5724                 .workqueue = nfsiod_workqueue,
5725                 .flags = RPC_TASK_ASYNC,
5726         };
5727
5728         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5729                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5730
5731         /* Ensure this is an unlock - when canceling a lock, the
5732          * canceled lock is passed in, and it won't be an unlock.
5733          */
5734         fl->fl_type = F_UNLCK;
5735
5736         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5737         if (data == NULL) {
5738                 nfs_free_seqid(seqid);
5739                 return ERR_PTR(-ENOMEM);
5740         }
5741
5742         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5743         msg.rpc_argp = &data->arg;
5744         msg.rpc_resp = &data->res;
5745         task_setup_data.callback_data = data;
5746         return rpc_run_task(&task_setup_data);
5747 }
5748
5749 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5750 {
5751         struct inode *inode = state->inode;
5752         struct nfs4_state_owner *sp = state->owner;
5753         struct nfs_inode *nfsi = NFS_I(inode);
5754         struct nfs_seqid *seqid;
5755         struct nfs4_lock_state *lsp;
5756         struct rpc_task *task;
5757         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5758         int status = 0;
5759         unsigned char fl_flags = request->fl_flags;
5760
5761         status = nfs4_set_lock_state(state, request);
5762         /* Unlock _before_ we do the RPC call */
5763         request->fl_flags |= FL_EXISTS;
5764         /* Exclude nfs_delegation_claim_locks() */
5765         mutex_lock(&sp->so_delegreturn_mutex);
5766         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5767         down_read(&nfsi->rwsem);
5768         if (do_vfs_lock(inode, request) == -ENOENT) {
5769                 up_read(&nfsi->rwsem);
5770                 mutex_unlock(&sp->so_delegreturn_mutex);
5771                 goto out;
5772         }
5773         up_read(&nfsi->rwsem);
5774         mutex_unlock(&sp->so_delegreturn_mutex);
5775         if (status != 0)
5776                 goto out;
5777         /* Is this a delegated lock? */
5778         lsp = request->fl_u.nfs4_fl.owner;
5779         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5780                 goto out;
5781         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5782         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5783         status = -ENOMEM;
5784         if (IS_ERR(seqid))
5785                 goto out;
5786         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5787         status = PTR_ERR(task);
5788         if (IS_ERR(task))
5789                 goto out;
5790         status = nfs4_wait_for_completion_rpc_task(task);
5791         rpc_put_task(task);
5792 out:
5793         request->fl_flags = fl_flags;
5794         trace_nfs4_unlock(request, state, F_SETLK, status);
5795         return status;
5796 }
5797
5798 struct nfs4_lockdata {
5799         struct nfs_lock_args arg;
5800         struct nfs_lock_res res;
5801         struct nfs4_lock_state *lsp;
5802         struct nfs_open_context *ctx;
5803         struct file_lock fl;
5804         unsigned long timestamp;
5805         int rpc_status;
5806         int cancelled;
5807         struct nfs_server *server;
5808 };
5809
5810 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5811                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5812                 gfp_t gfp_mask)
5813 {
5814         struct nfs4_lockdata *p;
5815         struct inode *inode = lsp->ls_state->inode;
5816         struct nfs_server *server = NFS_SERVER(inode);
5817         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5818
5819         p = kzalloc(sizeof(*p), gfp_mask);
5820         if (p == NULL)
5821                 return NULL;
5822
5823         p->arg.fh = NFS_FH(inode);
5824         p->arg.fl = &p->fl;
5825         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5826         if (IS_ERR(p->arg.open_seqid))
5827                 goto out_free;
5828         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
5829         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5830         if (IS_ERR(p->arg.lock_seqid))
5831                 goto out_free_seqid;
5832         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5833         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5834         p->arg.lock_owner.s_dev = server->s_dev;
5835         p->res.lock_seqid = p->arg.lock_seqid;
5836         p->lsp = lsp;
5837         p->server = server;
5838         atomic_inc(&lsp->ls_count);
5839         p->ctx = get_nfs_open_context(ctx);
5840         get_file(fl->fl_file);
5841         memcpy(&p->fl, fl, sizeof(p->fl));
5842         return p;
5843 out_free_seqid:
5844         nfs_free_seqid(p->arg.open_seqid);
5845 out_free:
5846         kfree(p);
5847         return NULL;
5848 }
5849
5850 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5851 {
5852         struct nfs4_lockdata *data = calldata;
5853         struct nfs4_state *state = data->lsp->ls_state;
5854
5855         dprintk("%s: begin!\n", __func__);
5856         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5857                 goto out_wait;
5858         /* Do we need to do an open_to_lock_owner? */
5859         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5860                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5861                         goto out_release_lock_seqid;
5862                 }
5863                 nfs4_stateid_copy(&data->arg.open_stateid,
5864                                 &state->open_stateid);
5865                 data->arg.new_lock_owner = 1;
5866                 data->res.open_seqid = data->arg.open_seqid;
5867         } else {
5868                 data->arg.new_lock_owner = 0;
5869                 nfs4_stateid_copy(&data->arg.lock_stateid,
5870                                 &data->lsp->ls_stateid);
5871         }
5872         if (!nfs4_valid_open_stateid(state)) {
5873                 data->rpc_status = -EBADF;
5874                 task->tk_action = NULL;
5875                 goto out_release_open_seqid;
5876         }
5877         data->timestamp = jiffies;
5878         if (nfs4_setup_sequence(data->server,
5879                                 &data->arg.seq_args,
5880                                 &data->res.seq_res,
5881                                 task) == 0)
5882                 return;
5883 out_release_open_seqid:
5884         nfs_release_seqid(data->arg.open_seqid);
5885 out_release_lock_seqid:
5886         nfs_release_seqid(data->arg.lock_seqid);
5887 out_wait:
5888         nfs4_sequence_done(task, &data->res.seq_res);
5889         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5890 }
5891
5892 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5893 {
5894         struct nfs4_lockdata *data = calldata;
5895         struct nfs4_lock_state *lsp = data->lsp;
5896
5897         dprintk("%s: begin!\n", __func__);
5898
5899         if (!nfs4_sequence_done(task, &data->res.seq_res))
5900                 return;
5901
5902         data->rpc_status = task->tk_status;
5903         switch (task->tk_status) {
5904         case 0:
5905                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
5906                                 data->timestamp);
5907                 if (data->arg.new_lock) {
5908                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5909                         if (do_vfs_lock(lsp->ls_state->inode, &data->fl) < 0) {
5910                                 rpc_restart_call_prepare(task);
5911                                 break;
5912                         }
5913                 }
5914                 if (data->arg.new_lock_owner != 0) {
5915                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
5916                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5917                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5918                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5919                         rpc_restart_call_prepare(task);
5920                 break;
5921         case -NFS4ERR_BAD_STATEID:
5922         case -NFS4ERR_OLD_STATEID:
5923         case -NFS4ERR_STALE_STATEID:
5924         case -NFS4ERR_EXPIRED:
5925                 if (data->arg.new_lock_owner != 0) {
5926                         if (!nfs4_stateid_match(&data->arg.open_stateid,
5927                                                 &lsp->ls_state->open_stateid))
5928                                 rpc_restart_call_prepare(task);
5929                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5930                                                 &lsp->ls_stateid))
5931                                 rpc_restart_call_prepare(task);
5932         }
5933         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5934 }
5935
5936 static void nfs4_lock_release(void *calldata)
5937 {
5938         struct nfs4_lockdata *data = calldata;
5939
5940         dprintk("%s: begin!\n", __func__);
5941         nfs_free_seqid(data->arg.open_seqid);
5942         if (data->cancelled != 0) {
5943                 struct rpc_task *task;
5944                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5945                                 data->arg.lock_seqid);
5946                 if (!IS_ERR(task))
5947                         rpc_put_task_async(task);
5948                 dprintk("%s: cancelling lock!\n", __func__);
5949         } else
5950                 nfs_free_seqid(data->arg.lock_seqid);
5951         nfs4_put_lock_state(data->lsp);
5952         put_nfs_open_context(data->ctx);
5953         fput(data->fl.fl_file);
5954         kfree(data);
5955         dprintk("%s: done!\n", __func__);
5956 }
5957
5958 static const struct rpc_call_ops nfs4_lock_ops = {
5959         .rpc_call_prepare = nfs4_lock_prepare,
5960         .rpc_call_done = nfs4_lock_done,
5961         .rpc_release = nfs4_lock_release,
5962 };
5963
5964 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5965 {
5966         switch (error) {
5967         case -NFS4ERR_ADMIN_REVOKED:
5968         case -NFS4ERR_BAD_STATEID:
5969                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5970                 if (new_lock_owner != 0 ||
5971                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5972                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5973                 break;
5974         case -NFS4ERR_STALE_STATEID:
5975                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5976         case -NFS4ERR_EXPIRED:
5977                 nfs4_schedule_lease_recovery(server->nfs_client);
5978         };
5979 }
5980
5981 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5982 {
5983         struct nfs4_lockdata *data;
5984         struct rpc_task *task;
5985         struct rpc_message msg = {
5986                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5987                 .rpc_cred = state->owner->so_cred,
5988         };
5989         struct rpc_task_setup task_setup_data = {
5990                 .rpc_client = NFS_CLIENT(state->inode),
5991                 .rpc_message = &msg,
5992                 .callback_ops = &nfs4_lock_ops,
5993                 .workqueue = nfsiod_workqueue,
5994                 .flags = RPC_TASK_ASYNC,
5995         };
5996         int ret;
5997
5998         dprintk("%s: begin!\n", __func__);
5999         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
6000                         fl->fl_u.nfs4_fl.owner,
6001                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
6002         if (data == NULL)
6003                 return -ENOMEM;
6004         if (IS_SETLKW(cmd))
6005                 data->arg.block = 1;
6006         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
6007         msg.rpc_argp = &data->arg;
6008         msg.rpc_resp = &data->res;
6009         task_setup_data.callback_data = data;
6010         if (recovery_type > NFS_LOCK_NEW) {
6011                 if (recovery_type == NFS_LOCK_RECLAIM)
6012                         data->arg.reclaim = NFS_LOCK_RECLAIM;
6013                 nfs4_set_sequence_privileged(&data->arg.seq_args);
6014         } else
6015                 data->arg.new_lock = 1;
6016         task = rpc_run_task(&task_setup_data);
6017         if (IS_ERR(task))
6018                 return PTR_ERR(task);
6019         ret = nfs4_wait_for_completion_rpc_task(task);
6020         if (ret == 0) {
6021                 ret = data->rpc_status;
6022                 if (ret)
6023                         nfs4_handle_setlk_error(data->server, data->lsp,
6024                                         data->arg.new_lock_owner, ret);
6025         } else
6026                 data->cancelled = 1;
6027         rpc_put_task(task);
6028         dprintk("%s: done, ret = %d!\n", __func__, ret);
6029         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
6030         return ret;
6031 }
6032
6033 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
6034 {
6035         struct nfs_server *server = NFS_SERVER(state->inode);
6036         struct nfs4_exception exception = {
6037                 .inode = state->inode,
6038         };
6039         int err;
6040
6041         do {
6042                 /* Cache the lock if possible... */
6043                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6044                         return 0;
6045                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
6046                 if (err != -NFS4ERR_DELAY)
6047                         break;
6048                 nfs4_handle_exception(server, err, &exception);
6049         } while (exception.retry);
6050         return err;
6051 }
6052
6053 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
6054 {
6055         struct nfs_server *server = NFS_SERVER(state->inode);
6056         struct nfs4_exception exception = {
6057                 .inode = state->inode,
6058         };
6059         int err;
6060
6061         err = nfs4_set_lock_state(state, request);
6062         if (err != 0)
6063                 return err;
6064         if (!recover_lost_locks) {
6065                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
6066                 return 0;
6067         }
6068         do {
6069                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6070                         return 0;
6071                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
6072                 switch (err) {
6073                 default:
6074                         goto out;
6075                 case -NFS4ERR_GRACE:
6076                 case -NFS4ERR_DELAY:
6077                         nfs4_handle_exception(server, err, &exception);
6078                         err = 0;
6079                 }
6080         } while (exception.retry);
6081 out:
6082         return err;
6083 }
6084
6085 #if defined(CONFIG_NFS_V4_1)
6086 /**
6087  * nfs41_check_expired_locks - possibly free a lock stateid
6088  *
6089  * @state: NFSv4 state for an inode
6090  *
6091  * Returns NFS_OK if recovery for this stateid is now finished.
6092  * Otherwise a negative NFS4ERR value is returned.
6093  */
6094 static int nfs41_check_expired_locks(struct nfs4_state *state)
6095 {
6096         int status, ret = -NFS4ERR_BAD_STATEID;
6097         struct nfs4_lock_state *lsp;
6098         struct nfs_server *server = NFS_SERVER(state->inode);
6099
6100         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
6101                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
6102                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
6103
6104                         status = nfs41_test_stateid(server,
6105                                         &lsp->ls_stateid,
6106                                         cred);
6107                         trace_nfs4_test_lock_stateid(state, lsp, status);
6108                         if (status != NFS_OK) {
6109                                 /* Free the stateid unless the server
6110                                  * informs us the stateid is unrecognized. */
6111                                 if (status != -NFS4ERR_BAD_STATEID)
6112                                         nfs41_free_stateid(server,
6113                                                         &lsp->ls_stateid,
6114                                                         cred);
6115                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6116                                 ret = status;
6117                         }
6118                 }
6119         };
6120
6121         return ret;
6122 }
6123
6124 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
6125 {
6126         int status = NFS_OK;
6127
6128         if (test_bit(LK_STATE_IN_USE, &state->flags))
6129                 status = nfs41_check_expired_locks(state);
6130         if (status != NFS_OK)
6131                 status = nfs4_lock_expired(state, request);
6132         return status;
6133 }
6134 #endif
6135
6136 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6137 {
6138         struct nfs_inode *nfsi = NFS_I(state->inode);
6139         struct nfs4_state_owner *sp = state->owner;
6140         unsigned char fl_flags = request->fl_flags;
6141         int status = -ENOLCK;
6142
6143         if ((fl_flags & FL_POSIX) &&
6144                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
6145                 goto out;
6146         /* Is this a delegated open? */
6147         status = nfs4_set_lock_state(state, request);
6148         if (status != 0)
6149                 goto out;
6150         request->fl_flags |= FL_ACCESS;
6151         status = do_vfs_lock(state->inode, request);
6152         if (status < 0)
6153                 goto out;
6154         mutex_lock(&sp->so_delegreturn_mutex);
6155         down_read(&nfsi->rwsem);
6156         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
6157                 /* Yes: cache locks! */
6158                 /* ...but avoid races with delegation recall... */
6159                 request->fl_flags = fl_flags & ~FL_SLEEP;
6160                 status = do_vfs_lock(state->inode, request);
6161                 up_read(&nfsi->rwsem);
6162                 mutex_unlock(&sp->so_delegreturn_mutex);
6163                 goto out;
6164         }
6165         up_read(&nfsi->rwsem);
6166         mutex_unlock(&sp->so_delegreturn_mutex);
6167         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
6168 out:
6169         request->fl_flags = fl_flags;
6170         return status;
6171 }
6172
6173 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6174 {
6175         struct nfs4_exception exception = {
6176                 .state = state,
6177                 .inode = state->inode,
6178         };
6179         int err;
6180
6181         do {
6182                 err = _nfs4_proc_setlk(state, cmd, request);
6183                 if (err == -NFS4ERR_DENIED)
6184                         err = -EAGAIN;
6185                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
6186                                 err, &exception);
6187         } while (exception.retry);
6188         return err;
6189 }
6190
6191 static int
6192 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
6193 {
6194         struct nfs_open_context *ctx;
6195         struct nfs4_state *state;
6196         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
6197         int status;
6198
6199         /* verify open state */
6200         ctx = nfs_file_open_context(filp);
6201         state = ctx->state;
6202
6203         if (request->fl_start < 0 || request->fl_end < 0)
6204                 return -EINVAL;
6205
6206         if (IS_GETLK(cmd)) {
6207                 if (state != NULL)
6208                         return nfs4_proc_getlk(state, F_GETLK, request);
6209                 return 0;
6210         }
6211
6212         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
6213                 return -EINVAL;
6214
6215         if (request->fl_type == F_UNLCK) {
6216                 if (state != NULL)
6217                         return nfs4_proc_unlck(state, cmd, request);
6218                 return 0;
6219         }
6220
6221         if (state == NULL)
6222                 return -ENOLCK;
6223         /*
6224          * Don't rely on the VFS having checked the file open mode,
6225          * since it won't do this for flock() locks.
6226          */
6227         switch (request->fl_type) {
6228         case F_RDLCK:
6229                 if (!(filp->f_mode & FMODE_READ))
6230                         return -EBADF;
6231                 break;
6232         case F_WRLCK:
6233                 if (!(filp->f_mode & FMODE_WRITE))
6234                         return -EBADF;
6235         }
6236
6237         do {
6238                 status = nfs4_proc_setlk(state, cmd, request);
6239                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6240                         break;
6241                 timeout = nfs4_set_lock_task_retry(timeout);
6242                 status = -ERESTARTSYS;
6243                 if (signalled())
6244                         break;
6245         } while(status < 0);
6246         return status;
6247 }
6248
6249 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6250 {
6251         struct nfs_server *server = NFS_SERVER(state->inode);
6252         int err;
6253
6254         err = nfs4_set_lock_state(state, fl);
6255         if (err != 0)
6256                 return err;
6257         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6258         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6259 }
6260
6261 struct nfs_release_lockowner_data {
6262         struct nfs4_lock_state *lsp;
6263         struct nfs_server *server;
6264         struct nfs_release_lockowner_args args;
6265         struct nfs_release_lockowner_res res;
6266         unsigned long timestamp;
6267 };
6268
6269 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6270 {
6271         struct nfs_release_lockowner_data *data = calldata;
6272         struct nfs_server *server = data->server;
6273         nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6274                              &data->args.seq_args, &data->res.seq_res, task);
6275         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6276         data->timestamp = jiffies;
6277 }
6278
6279 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6280 {
6281         struct nfs_release_lockowner_data *data = calldata;
6282         struct nfs_server *server = data->server;
6283
6284         nfs40_sequence_done(task, &data->res.seq_res);
6285
6286         switch (task->tk_status) {
6287         case 0:
6288                 renew_lease(server, data->timestamp);
6289                 break;
6290         case -NFS4ERR_STALE_CLIENTID:
6291         case -NFS4ERR_EXPIRED:
6292                 nfs4_schedule_lease_recovery(server->nfs_client);
6293                 break;
6294         case -NFS4ERR_LEASE_MOVED:
6295         case -NFS4ERR_DELAY:
6296                 if (nfs4_async_handle_error(task, server,
6297                                             NULL, NULL) == -EAGAIN)
6298                         rpc_restart_call_prepare(task);
6299         }
6300 }
6301
6302 static void nfs4_release_lockowner_release(void *calldata)
6303 {
6304         struct nfs_release_lockowner_data *data = calldata;
6305         nfs4_free_lock_state(data->server, data->lsp);
6306         kfree(calldata);
6307 }
6308
6309 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6310         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6311         .rpc_call_done = nfs4_release_lockowner_done,
6312         .rpc_release = nfs4_release_lockowner_release,
6313 };
6314
6315 static void
6316 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6317 {
6318         struct nfs_release_lockowner_data *data;
6319         struct rpc_message msg = {
6320                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6321         };
6322
6323         if (server->nfs_client->cl_mvops->minor_version != 0)
6324                 return;
6325
6326         data = kmalloc(sizeof(*data), GFP_NOFS);
6327         if (!data)
6328                 return;
6329         data->lsp = lsp;
6330         data->server = server;
6331         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6332         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6333         data->args.lock_owner.s_dev = server->s_dev;
6334
6335         msg.rpc_argp = &data->args;
6336         msg.rpc_resp = &data->res;
6337         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6338         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6339 }
6340
6341 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6342
6343 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
6344                                    struct dentry *unused, struct inode *inode,
6345                                    const char *key, const void *buf,
6346                                    size_t buflen, int flags)
6347 {
6348         return nfs4_proc_set_acl(inode, buf, buflen);
6349 }
6350
6351 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
6352                                    struct dentry *unused, struct inode *inode,
6353                                    const char *key, void *buf, size_t buflen)
6354 {
6355         return nfs4_proc_get_acl(inode, buf, buflen);
6356 }
6357
6358 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
6359 {
6360         return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
6361 }
6362
6363 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6364
6365 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
6366                                      struct dentry *unused, struct inode *inode,
6367                                      const char *key, const void *buf,
6368                                      size_t buflen, int flags)
6369 {
6370         if (security_ismaclabel(key))
6371                 return nfs4_set_security_label(inode, buf, buflen);
6372
6373         return -EOPNOTSUPP;
6374 }
6375
6376 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
6377                                      struct dentry *unused, struct inode *inode,
6378                                      const char *key, void *buf, size_t buflen)
6379 {
6380         if (security_ismaclabel(key))
6381                 return nfs4_get_security_label(inode, buf, buflen);
6382         return -EOPNOTSUPP;
6383 }
6384
6385 static ssize_t
6386 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6387 {
6388         int len = 0;
6389
6390         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
6391                 len = security_inode_listsecurity(inode, list, list_len);
6392                 if (list_len && len > list_len)
6393                         return -ERANGE;
6394         }
6395         return len;
6396 }
6397
6398 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6399         .prefix = XATTR_SECURITY_PREFIX,
6400         .get    = nfs4_xattr_get_nfs4_label,
6401         .set    = nfs4_xattr_set_nfs4_label,
6402 };
6403
6404 #else
6405
6406 static ssize_t
6407 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6408 {
6409         return 0;
6410 }
6411
6412 #endif
6413
6414 /*
6415  * nfs_fhget will use either the mounted_on_fileid or the fileid
6416  */
6417 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6418 {
6419         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6420                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6421               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6422               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6423                 return;
6424
6425         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6426                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6427         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6428         fattr->nlink = 2;
6429 }
6430
6431 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6432                                    const struct qstr *name,
6433                                    struct nfs4_fs_locations *fs_locations,
6434                                    struct page *page)
6435 {
6436         struct nfs_server *server = NFS_SERVER(dir);
6437         u32 bitmask[3] = {
6438                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6439         };
6440         struct nfs4_fs_locations_arg args = {
6441                 .dir_fh = NFS_FH(dir),
6442                 .name = name,
6443                 .page = page,
6444                 .bitmask = bitmask,
6445         };
6446         struct nfs4_fs_locations_res res = {
6447                 .fs_locations = fs_locations,
6448         };
6449         struct rpc_message msg = {
6450                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6451                 .rpc_argp = &args,
6452                 .rpc_resp = &res,
6453         };
6454         int status;
6455
6456         dprintk("%s: start\n", __func__);
6457
6458         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6459          * is not supported */
6460         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6461                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6462         else
6463                 bitmask[0] |= FATTR4_WORD0_FILEID;
6464
6465         nfs_fattr_init(&fs_locations->fattr);
6466         fs_locations->server = server;
6467         fs_locations->nlocations = 0;
6468         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6469         dprintk("%s: returned status = %d\n", __func__, status);
6470         return status;
6471 }
6472
6473 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6474                            const struct qstr *name,
6475                            struct nfs4_fs_locations *fs_locations,
6476                            struct page *page)
6477 {
6478         struct nfs4_exception exception = { };
6479         int err;
6480         do {
6481                 err = _nfs4_proc_fs_locations(client, dir, name,
6482                                 fs_locations, page);
6483                 trace_nfs4_get_fs_locations(dir, name, err);
6484                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6485                                 &exception);
6486         } while (exception.retry);
6487         return err;
6488 }
6489
6490 /*
6491  * This operation also signals the server that this client is
6492  * performing migration recovery.  The server can stop returning
6493  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6494  * appended to this compound to identify the client ID which is
6495  * performing recovery.
6496  */
6497 static int _nfs40_proc_get_locations(struct inode *inode,
6498                                      struct nfs4_fs_locations *locations,
6499                                      struct page *page, struct rpc_cred *cred)
6500 {
6501         struct nfs_server *server = NFS_SERVER(inode);
6502         struct rpc_clnt *clnt = server->client;
6503         u32 bitmask[2] = {
6504                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6505         };
6506         struct nfs4_fs_locations_arg args = {
6507                 .clientid       = server->nfs_client->cl_clientid,
6508                 .fh             = NFS_FH(inode),
6509                 .page           = page,
6510                 .bitmask        = bitmask,
6511                 .migration      = 1,            /* skip LOOKUP */
6512                 .renew          = 1,            /* append RENEW */
6513         };
6514         struct nfs4_fs_locations_res res = {
6515                 .fs_locations   = locations,
6516                 .migration      = 1,
6517                 .renew          = 1,
6518         };
6519         struct rpc_message msg = {
6520                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6521                 .rpc_argp       = &args,
6522                 .rpc_resp       = &res,
6523                 .rpc_cred       = cred,
6524         };
6525         unsigned long now = jiffies;
6526         int status;
6527
6528         nfs_fattr_init(&locations->fattr);
6529         locations->server = server;
6530         locations->nlocations = 0;
6531
6532         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6533         nfs4_set_sequence_privileged(&args.seq_args);
6534         status = nfs4_call_sync_sequence(clnt, server, &msg,
6535                                         &args.seq_args, &res.seq_res);
6536         if (status)
6537                 return status;
6538
6539         renew_lease(server, now);
6540         return 0;
6541 }
6542
6543 #ifdef CONFIG_NFS_V4_1
6544
6545 /*
6546  * This operation also signals the server that this client is
6547  * performing migration recovery.  The server can stop asserting
6548  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6549  * performing this operation is identified in the SEQUENCE
6550  * operation in this compound.
6551  *
6552  * When the client supports GETATTR(fs_locations_info), it can
6553  * be plumbed in here.
6554  */
6555 static int _nfs41_proc_get_locations(struct inode *inode,
6556                                      struct nfs4_fs_locations *locations,
6557                                      struct page *page, struct rpc_cred *cred)
6558 {
6559         struct nfs_server *server = NFS_SERVER(inode);
6560         struct rpc_clnt *clnt = server->client;
6561         u32 bitmask[2] = {
6562                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6563         };
6564         struct nfs4_fs_locations_arg args = {
6565                 .fh             = NFS_FH(inode),
6566                 .page           = page,
6567                 .bitmask        = bitmask,
6568                 .migration      = 1,            /* skip LOOKUP */
6569         };
6570         struct nfs4_fs_locations_res res = {
6571                 .fs_locations   = locations,
6572                 .migration      = 1,
6573         };
6574         struct rpc_message msg = {
6575                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6576                 .rpc_argp       = &args,
6577                 .rpc_resp       = &res,
6578                 .rpc_cred       = cred,
6579         };
6580         int status;
6581
6582         nfs_fattr_init(&locations->fattr);
6583         locations->server = server;
6584         locations->nlocations = 0;
6585
6586         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6587         nfs4_set_sequence_privileged(&args.seq_args);
6588         status = nfs4_call_sync_sequence(clnt, server, &msg,
6589                                         &args.seq_args, &res.seq_res);
6590         if (status == NFS4_OK &&
6591             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6592                 status = -NFS4ERR_LEASE_MOVED;
6593         return status;
6594 }
6595
6596 #endif  /* CONFIG_NFS_V4_1 */
6597
6598 /**
6599  * nfs4_proc_get_locations - discover locations for a migrated FSID
6600  * @inode: inode on FSID that is migrating
6601  * @locations: result of query
6602  * @page: buffer
6603  * @cred: credential to use for this operation
6604  *
6605  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6606  * operation failed, or a negative errno if a local error occurred.
6607  *
6608  * On success, "locations" is filled in, but if the server has
6609  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6610  * asserted.
6611  *
6612  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6613  * from this client that require migration recovery.
6614  */
6615 int nfs4_proc_get_locations(struct inode *inode,
6616                             struct nfs4_fs_locations *locations,
6617                             struct page *page, struct rpc_cred *cred)
6618 {
6619         struct nfs_server *server = NFS_SERVER(inode);
6620         struct nfs_client *clp = server->nfs_client;
6621         const struct nfs4_mig_recovery_ops *ops =
6622                                         clp->cl_mvops->mig_recovery_ops;
6623         struct nfs4_exception exception = { };
6624         int status;
6625
6626         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6627                 (unsigned long long)server->fsid.major,
6628                 (unsigned long long)server->fsid.minor,
6629                 clp->cl_hostname);
6630         nfs_display_fhandle(NFS_FH(inode), __func__);
6631
6632         do {
6633                 status = ops->get_locations(inode, locations, page, cred);
6634                 if (status != -NFS4ERR_DELAY)
6635                         break;
6636                 nfs4_handle_exception(server, status, &exception);
6637         } while (exception.retry);
6638         return status;
6639 }
6640
6641 /*
6642  * This operation also signals the server that this client is
6643  * performing "lease moved" recovery.  The server can stop
6644  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6645  * is appended to this compound to identify the client ID which is
6646  * performing recovery.
6647  */
6648 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6649 {
6650         struct nfs_server *server = NFS_SERVER(inode);
6651         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6652         struct rpc_clnt *clnt = server->client;
6653         struct nfs4_fsid_present_arg args = {
6654                 .fh             = NFS_FH(inode),
6655                 .clientid       = clp->cl_clientid,
6656                 .renew          = 1,            /* append RENEW */
6657         };
6658         struct nfs4_fsid_present_res res = {
6659                 .renew          = 1,
6660         };
6661         struct rpc_message msg = {
6662                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6663                 .rpc_argp       = &args,
6664                 .rpc_resp       = &res,
6665                 .rpc_cred       = cred,
6666         };
6667         unsigned long now = jiffies;
6668         int status;
6669
6670         res.fh = nfs_alloc_fhandle();
6671         if (res.fh == NULL)
6672                 return -ENOMEM;
6673
6674         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6675         nfs4_set_sequence_privileged(&args.seq_args);
6676         status = nfs4_call_sync_sequence(clnt, server, &msg,
6677                                                 &args.seq_args, &res.seq_res);
6678         nfs_free_fhandle(res.fh);
6679         if (status)
6680                 return status;
6681
6682         do_renew_lease(clp, now);
6683         return 0;
6684 }
6685
6686 #ifdef CONFIG_NFS_V4_1
6687
6688 /*
6689  * This operation also signals the server that this client is
6690  * performing "lease moved" recovery.  The server can stop asserting
6691  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6692  * this operation is identified in the SEQUENCE operation in this
6693  * compound.
6694  */
6695 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6696 {
6697         struct nfs_server *server = NFS_SERVER(inode);
6698         struct rpc_clnt *clnt = server->client;
6699         struct nfs4_fsid_present_arg args = {
6700                 .fh             = NFS_FH(inode),
6701         };
6702         struct nfs4_fsid_present_res res = {
6703         };
6704         struct rpc_message msg = {
6705                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6706                 .rpc_argp       = &args,
6707                 .rpc_resp       = &res,
6708                 .rpc_cred       = cred,
6709         };
6710         int status;
6711
6712         res.fh = nfs_alloc_fhandle();
6713         if (res.fh == NULL)
6714                 return -ENOMEM;
6715
6716         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6717         nfs4_set_sequence_privileged(&args.seq_args);
6718         status = nfs4_call_sync_sequence(clnt, server, &msg,
6719                                                 &args.seq_args, &res.seq_res);
6720         nfs_free_fhandle(res.fh);
6721         if (status == NFS4_OK &&
6722             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6723                 status = -NFS4ERR_LEASE_MOVED;
6724         return status;
6725 }
6726
6727 #endif  /* CONFIG_NFS_V4_1 */
6728
6729 /**
6730  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6731  * @inode: inode on FSID to check
6732  * @cred: credential to use for this operation
6733  *
6734  * Server indicates whether the FSID is present, moved, or not
6735  * recognized.  This operation is necessary to clear a LEASE_MOVED
6736  * condition for this client ID.
6737  *
6738  * Returns NFS4_OK if the FSID is present on this server,
6739  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6740  *  NFS4ERR code if some error occurred on the server, or a
6741  *  negative errno if a local failure occurred.
6742  */
6743 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6744 {
6745         struct nfs_server *server = NFS_SERVER(inode);
6746         struct nfs_client *clp = server->nfs_client;
6747         const struct nfs4_mig_recovery_ops *ops =
6748                                         clp->cl_mvops->mig_recovery_ops;
6749         struct nfs4_exception exception = { };
6750         int status;
6751
6752         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6753                 (unsigned long long)server->fsid.major,
6754                 (unsigned long long)server->fsid.minor,
6755                 clp->cl_hostname);
6756         nfs_display_fhandle(NFS_FH(inode), __func__);
6757
6758         do {
6759                 status = ops->fsid_present(inode, cred);
6760                 if (status != -NFS4ERR_DELAY)
6761                         break;
6762                 nfs4_handle_exception(server, status, &exception);
6763         } while (exception.retry);
6764         return status;
6765 }
6766
6767 /**
6768  * If 'use_integrity' is true and the state managment nfs_client
6769  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6770  * and the machine credential as per RFC3530bis and RFC5661 Security
6771  * Considerations sections. Otherwise, just use the user cred with the
6772  * filesystem's rpc_client.
6773  */
6774 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6775 {
6776         int status;
6777         struct nfs4_secinfo_arg args = {
6778                 .dir_fh = NFS_FH(dir),
6779                 .name   = name,
6780         };
6781         struct nfs4_secinfo_res res = {
6782                 .flavors     = flavors,
6783         };
6784         struct rpc_message msg = {
6785                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6786                 .rpc_argp = &args,
6787                 .rpc_resp = &res,
6788         };
6789         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6790         struct rpc_cred *cred = NULL;
6791
6792         if (use_integrity) {
6793                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6794                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6795                 msg.rpc_cred = cred;
6796         }
6797
6798         dprintk("NFS call  secinfo %s\n", name->name);
6799
6800         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6801                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6802
6803         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6804                                 &res.seq_res, 0);
6805         dprintk("NFS reply  secinfo: %d\n", status);
6806
6807         if (cred)
6808                 put_rpccred(cred);
6809
6810         return status;
6811 }
6812
6813 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6814                       struct nfs4_secinfo_flavors *flavors)
6815 {
6816         struct nfs4_exception exception = { };
6817         int err;
6818         do {
6819                 err = -NFS4ERR_WRONGSEC;
6820
6821                 /* try to use integrity protection with machine cred */
6822                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6823                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6824
6825                 /*
6826                  * if unable to use integrity protection, or SECINFO with
6827                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6828                  * disallowed by spec, but exists in deployed servers) use
6829                  * the current filesystem's rpc_client and the user cred.
6830                  */
6831                 if (err == -NFS4ERR_WRONGSEC)
6832                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6833
6834                 trace_nfs4_secinfo(dir, name, err);
6835                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6836                                 &exception);
6837         } while (exception.retry);
6838         return err;
6839 }
6840
6841 #ifdef CONFIG_NFS_V4_1
6842 /*
6843  * Check the exchange flags returned by the server for invalid flags, having
6844  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6845  * DS flags set.
6846  */
6847 static int nfs4_check_cl_exchange_flags(u32 flags)
6848 {
6849         if (flags & ~EXCHGID4_FLAG_MASK_R)
6850                 goto out_inval;
6851         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6852             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6853                 goto out_inval;
6854         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6855                 goto out_inval;
6856         return NFS_OK;
6857 out_inval:
6858         return -NFS4ERR_INVAL;
6859 }
6860
6861 static bool
6862 nfs41_same_server_scope(struct nfs41_server_scope *a,
6863                         struct nfs41_server_scope *b)
6864 {
6865         if (a->server_scope_sz == b->server_scope_sz &&
6866             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6867                 return true;
6868
6869         return false;
6870 }
6871
6872 static void
6873 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
6874 {
6875 }
6876
6877 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
6878         .rpc_call_done =  &nfs4_bind_one_conn_to_session_done,
6879 };
6880
6881 /*
6882  * nfs4_proc_bind_one_conn_to_session()
6883  *
6884  * The 4.1 client currently uses the same TCP connection for the
6885  * fore and backchannel.
6886  */
6887 static
6888 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
6889                 struct rpc_xprt *xprt,
6890                 struct nfs_client *clp,
6891                 struct rpc_cred *cred)
6892 {
6893         int status;
6894         struct nfs41_bind_conn_to_session_args args = {
6895                 .client = clp,
6896                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
6897         };
6898         struct nfs41_bind_conn_to_session_res res;
6899         struct rpc_message msg = {
6900                 .rpc_proc =
6901                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6902                 .rpc_argp = &args,
6903                 .rpc_resp = &res,
6904                 .rpc_cred = cred,
6905         };
6906         struct rpc_task_setup task_setup_data = {
6907                 .rpc_client = clnt,
6908                 .rpc_xprt = xprt,
6909                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
6910                 .rpc_message = &msg,
6911                 .flags = RPC_TASK_TIMEOUT,
6912         };
6913         struct rpc_task *task;
6914
6915         dprintk("--> %s\n", __func__);
6916
6917         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
6918         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
6919                 args.dir = NFS4_CDFC4_FORE;
6920
6921         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
6922         if (xprt != rcu_access_pointer(clnt->cl_xprt))
6923                 args.dir = NFS4_CDFC4_FORE;
6924
6925         task = rpc_run_task(&task_setup_data);
6926         if (!IS_ERR(task)) {
6927                 status = task->tk_status;
6928                 rpc_put_task(task);
6929         } else
6930                 status = PTR_ERR(task);
6931         trace_nfs4_bind_conn_to_session(clp, status);
6932         if (status == 0) {
6933                 if (memcmp(res.sessionid.data,
6934                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6935                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6936                         status = -EIO;
6937                         goto out;
6938                 }
6939                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
6940                         dprintk("NFS: %s: Unexpected direction from server\n",
6941                                 __func__);
6942                         status = -EIO;
6943                         goto out;
6944                 }
6945                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
6946                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6947                                 __func__);
6948                         status = -EIO;
6949                         goto out;
6950                 }
6951         }
6952 out:
6953         dprintk("<-- %s status= %d\n", __func__, status);
6954         return status;
6955 }
6956
6957 struct rpc_bind_conn_calldata {
6958         struct nfs_client *clp;
6959         struct rpc_cred *cred;
6960 };
6961
6962 static int
6963 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
6964                 struct rpc_xprt *xprt,
6965                 void *calldata)
6966 {
6967         struct rpc_bind_conn_calldata *p = calldata;
6968
6969         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
6970 }
6971
6972 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6973 {
6974         struct rpc_bind_conn_calldata data = {
6975                 .clp = clp,
6976                 .cred = cred,
6977         };
6978         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
6979                         nfs4_proc_bind_conn_to_session_callback, &data);
6980 }
6981
6982 /*
6983  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6984  * and operations we'd like to see to enable certain features in the allow map
6985  */
6986 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6987         .how = SP4_MACH_CRED,
6988         .enforce.u.words = {
6989                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6990                       1 << (OP_EXCHANGE_ID - 32) |
6991                       1 << (OP_CREATE_SESSION - 32) |
6992                       1 << (OP_DESTROY_SESSION - 32) |
6993                       1 << (OP_DESTROY_CLIENTID - 32)
6994         },
6995         .allow.u.words = {
6996                 [0] = 1 << (OP_CLOSE) |
6997                       1 << (OP_OPEN_DOWNGRADE) |
6998                       1 << (OP_LOCKU) |
6999                       1 << (OP_DELEGRETURN) |
7000                       1 << (OP_COMMIT),
7001                 [1] = 1 << (OP_SECINFO - 32) |
7002                       1 << (OP_SECINFO_NO_NAME - 32) |
7003                       1 << (OP_LAYOUTRETURN - 32) |
7004                       1 << (OP_TEST_STATEID - 32) |
7005                       1 << (OP_FREE_STATEID - 32) |
7006                       1 << (OP_WRITE - 32)
7007         }
7008 };
7009
7010 /*
7011  * Select the state protection mode for client `clp' given the server results
7012  * from exchange_id in `sp'.
7013  *
7014  * Returns 0 on success, negative errno otherwise.
7015  */
7016 static int nfs4_sp4_select_mode(struct nfs_client *clp,
7017                                  struct nfs41_state_protection *sp)
7018 {
7019         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
7020                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
7021                       1 << (OP_EXCHANGE_ID - 32) |
7022                       1 << (OP_CREATE_SESSION - 32) |
7023                       1 << (OP_DESTROY_SESSION - 32) |
7024                       1 << (OP_DESTROY_CLIENTID - 32)
7025         };
7026         unsigned int i;
7027
7028         if (sp->how == SP4_MACH_CRED) {
7029                 /* Print state protect result */
7030                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
7031                 for (i = 0; i <= LAST_NFS4_OP; i++) {
7032                         if (test_bit(i, sp->enforce.u.longs))
7033                                 dfprintk(MOUNT, "  enforce op %d\n", i);
7034                         if (test_bit(i, sp->allow.u.longs))
7035                                 dfprintk(MOUNT, "  allow op %d\n", i);
7036                 }
7037
7038                 /* make sure nothing is on enforce list that isn't supported */
7039                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
7040                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
7041                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7042                                 return -EINVAL;
7043                         }
7044                 }
7045
7046                 /*
7047                  * Minimal mode - state operations are allowed to use machine
7048                  * credential.  Note this already happens by default, so the
7049                  * client doesn't have to do anything more than the negotiation.
7050                  *
7051                  * NOTE: we don't care if EXCHANGE_ID is in the list -
7052                  *       we're already using the machine cred for exchange_id
7053                  *       and will never use a different cred.
7054                  */
7055                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
7056                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
7057                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
7058                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
7059                         dfprintk(MOUNT, "sp4_mach_cred:\n");
7060                         dfprintk(MOUNT, "  minimal mode enabled\n");
7061                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
7062                 } else {
7063                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7064                         return -EINVAL;
7065                 }
7066
7067                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
7068                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
7069                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
7070                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
7071                         dfprintk(MOUNT, "  cleanup mode enabled\n");
7072                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
7073                 }
7074
7075                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
7076                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
7077                         set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP,
7078                                 &clp->cl_sp4_flags);
7079                 }
7080
7081                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
7082                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
7083                         dfprintk(MOUNT, "  secinfo mode enabled\n");
7084                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
7085                 }
7086
7087                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
7088                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
7089                         dfprintk(MOUNT, "  stateid mode enabled\n");
7090                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
7091                 }
7092
7093                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
7094                         dfprintk(MOUNT, "  write mode enabled\n");
7095                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
7096                 }
7097
7098                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
7099                         dfprintk(MOUNT, "  commit mode enabled\n");
7100                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
7101                 }
7102         }
7103
7104         return 0;
7105 }
7106
7107 /*
7108  * _nfs4_proc_exchange_id()
7109  *
7110  * Wrapper for EXCHANGE_ID operation.
7111  */
7112 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
7113         u32 sp4_how)
7114 {
7115         nfs4_verifier verifier;
7116         struct nfs41_exchange_id_args args = {
7117                 .verifier = &verifier,
7118                 .client = clp,
7119 #ifdef CONFIG_NFS_V4_1_MIGRATION
7120                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
7121                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
7122                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
7123 #else
7124                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
7125                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
7126 #endif
7127         };
7128         struct nfs41_exchange_id_res res = {
7129                 0
7130         };
7131         int status;
7132         struct rpc_message msg = {
7133                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
7134                 .rpc_argp = &args,
7135                 .rpc_resp = &res,
7136                 .rpc_cred = cred,
7137         };
7138
7139         nfs4_init_boot_verifier(clp, &verifier);
7140
7141         status = nfs4_init_uniform_client_string(clp);
7142         if (status)
7143                 goto out;
7144
7145         dprintk("NFS call  exchange_id auth=%s, '%s'\n",
7146                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
7147                 clp->cl_owner_id);
7148
7149         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
7150                                         GFP_NOFS);
7151         if (unlikely(res.server_owner == NULL)) {
7152                 status = -ENOMEM;
7153                 goto out;
7154         }
7155
7156         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
7157                                         GFP_NOFS);
7158         if (unlikely(res.server_scope == NULL)) {
7159                 status = -ENOMEM;
7160                 goto out_server_owner;
7161         }
7162
7163         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
7164         if (unlikely(res.impl_id == NULL)) {
7165                 status = -ENOMEM;
7166                 goto out_server_scope;
7167         }
7168
7169         switch (sp4_how) {
7170         case SP4_NONE:
7171                 args.state_protect.how = SP4_NONE;
7172                 break;
7173
7174         case SP4_MACH_CRED:
7175                 args.state_protect = nfs4_sp4_mach_cred_request;
7176                 break;
7177
7178         default:
7179                 /* unsupported! */
7180                 WARN_ON_ONCE(1);
7181                 status = -EINVAL;
7182                 goto out_impl_id;
7183         }
7184
7185         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7186         trace_nfs4_exchange_id(clp, status);
7187         if (status == 0)
7188                 status = nfs4_check_cl_exchange_flags(res.flags);
7189
7190         if (status == 0)
7191                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
7192
7193         if (status == 0) {
7194                 clp->cl_clientid = res.clientid;
7195                 clp->cl_exchange_flags = res.flags;
7196                 /* Client ID is not confirmed */
7197                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
7198                         clear_bit(NFS4_SESSION_ESTABLISHED,
7199                                         &clp->cl_session->session_state);
7200                         clp->cl_seqid = res.seqid;
7201                 }
7202
7203                 kfree(clp->cl_serverowner);
7204                 clp->cl_serverowner = res.server_owner;
7205                 res.server_owner = NULL;
7206
7207                 /* use the most recent implementation id */
7208                 kfree(clp->cl_implid);
7209                 clp->cl_implid = res.impl_id;
7210                 res.impl_id = NULL;
7211
7212                 if (clp->cl_serverscope != NULL &&
7213                     !nfs41_same_server_scope(clp->cl_serverscope,
7214                                              res.server_scope)) {
7215                         dprintk("%s: server_scope mismatch detected\n",
7216                                 __func__);
7217                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
7218                         kfree(clp->cl_serverscope);
7219                         clp->cl_serverscope = NULL;
7220                 }
7221
7222                 if (clp->cl_serverscope == NULL) {
7223                         clp->cl_serverscope = res.server_scope;
7224                         res.server_scope = NULL;
7225                 }
7226         }
7227
7228 out_impl_id:
7229         kfree(res.impl_id);
7230 out_server_scope:
7231         kfree(res.server_scope);
7232 out_server_owner:
7233         kfree(res.server_owner);
7234 out:
7235         if (clp->cl_implid != NULL)
7236                 dprintk("NFS reply exchange_id: Server Implementation ID: "
7237                         "domain: %s, name: %s, date: %llu,%u\n",
7238                         clp->cl_implid->domain, clp->cl_implid->name,
7239                         clp->cl_implid->date.seconds,
7240                         clp->cl_implid->date.nseconds);
7241         dprintk("NFS reply exchange_id: %d\n", status);
7242         return status;
7243 }
7244
7245 /*
7246  * nfs4_proc_exchange_id()
7247  *
7248  * Returns zero, a negative errno, or a negative NFS4ERR status code.
7249  *
7250  * Since the clientid has expired, all compounds using sessions
7251  * associated with the stale clientid will be returning
7252  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
7253  * be in some phase of session reset.
7254  *
7255  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
7256  */
7257 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
7258 {
7259         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
7260         int status;
7261
7262         /* try SP4_MACH_CRED if krb5i/p */
7263         if (authflavor == RPC_AUTH_GSS_KRB5I ||
7264             authflavor == RPC_AUTH_GSS_KRB5P) {
7265                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
7266                 if (!status)
7267                         return 0;
7268         }
7269
7270         /* try SP4_NONE */
7271         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
7272 }
7273
7274 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
7275                 struct rpc_cred *cred)
7276 {
7277         struct rpc_message msg = {
7278                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
7279                 .rpc_argp = clp,
7280                 .rpc_cred = cred,
7281         };
7282         int status;
7283
7284         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7285         trace_nfs4_destroy_clientid(clp, status);
7286         if (status)
7287                 dprintk("NFS: Got error %d from the server %s on "
7288                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
7289         return status;
7290 }
7291
7292 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
7293                 struct rpc_cred *cred)
7294 {
7295         unsigned int loop;
7296         int ret;
7297
7298         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
7299                 ret = _nfs4_proc_destroy_clientid(clp, cred);
7300                 switch (ret) {
7301                 case -NFS4ERR_DELAY:
7302                 case -NFS4ERR_CLIENTID_BUSY:
7303                         ssleep(1);
7304                         break;
7305                 default:
7306                         return ret;
7307                 }
7308         }
7309         return 0;
7310 }
7311
7312 int nfs4_destroy_clientid(struct nfs_client *clp)
7313 {
7314         struct rpc_cred *cred;
7315         int ret = 0;
7316
7317         if (clp->cl_mvops->minor_version < 1)
7318                 goto out;
7319         if (clp->cl_exchange_flags == 0)
7320                 goto out;
7321         if (clp->cl_preserve_clid)
7322                 goto out;
7323         cred = nfs4_get_clid_cred(clp);
7324         ret = nfs4_proc_destroy_clientid(clp, cred);
7325         if (cred)
7326                 put_rpccred(cred);
7327         switch (ret) {
7328         case 0:
7329         case -NFS4ERR_STALE_CLIENTID:
7330                 clp->cl_exchange_flags = 0;
7331         }
7332 out:
7333         return ret;
7334 }
7335
7336 struct nfs4_get_lease_time_data {
7337         struct nfs4_get_lease_time_args *args;
7338         struct nfs4_get_lease_time_res *res;
7339         struct nfs_client *clp;
7340 };
7341
7342 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7343                                         void *calldata)
7344 {
7345         struct nfs4_get_lease_time_data *data =
7346                         (struct nfs4_get_lease_time_data *)calldata;
7347
7348         dprintk("--> %s\n", __func__);
7349         /* just setup sequence, do not trigger session recovery
7350            since we're invoked within one */
7351         nfs41_setup_sequence(data->clp->cl_session,
7352                         &data->args->la_seq_args,
7353                         &data->res->lr_seq_res,
7354                         task);
7355         dprintk("<-- %s\n", __func__);
7356 }
7357
7358 /*
7359  * Called from nfs4_state_manager thread for session setup, so don't recover
7360  * from sequence operation or clientid errors.
7361  */
7362 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7363 {
7364         struct nfs4_get_lease_time_data *data =
7365                         (struct nfs4_get_lease_time_data *)calldata;
7366
7367         dprintk("--> %s\n", __func__);
7368         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7369                 return;
7370         switch (task->tk_status) {
7371         case -NFS4ERR_DELAY:
7372         case -NFS4ERR_GRACE:
7373                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7374                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7375                 task->tk_status = 0;
7376                 /* fall through */
7377         case -NFS4ERR_RETRY_UNCACHED_REP:
7378                 rpc_restart_call_prepare(task);
7379                 return;
7380         }
7381         dprintk("<-- %s\n", __func__);
7382 }
7383
7384 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7385         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7386         .rpc_call_done = nfs4_get_lease_time_done,
7387 };
7388
7389 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7390 {
7391         struct rpc_task *task;
7392         struct nfs4_get_lease_time_args args;
7393         struct nfs4_get_lease_time_res res = {
7394                 .lr_fsinfo = fsinfo,
7395         };
7396         struct nfs4_get_lease_time_data data = {
7397                 .args = &args,
7398                 .res = &res,
7399                 .clp = clp,
7400         };
7401         struct rpc_message msg = {
7402                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7403                 .rpc_argp = &args,
7404                 .rpc_resp = &res,
7405         };
7406         struct rpc_task_setup task_setup = {
7407                 .rpc_client = clp->cl_rpcclient,
7408                 .rpc_message = &msg,
7409                 .callback_ops = &nfs4_get_lease_time_ops,
7410                 .callback_data = &data,
7411                 .flags = RPC_TASK_TIMEOUT,
7412         };
7413         int status;
7414
7415         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7416         nfs4_set_sequence_privileged(&args.la_seq_args);
7417         dprintk("--> %s\n", __func__);
7418         task = rpc_run_task(&task_setup);
7419
7420         if (IS_ERR(task))
7421                 status = PTR_ERR(task);
7422         else {
7423                 status = task->tk_status;
7424                 rpc_put_task(task);
7425         }
7426         dprintk("<-- %s return %d\n", __func__, status);
7427
7428         return status;
7429 }
7430
7431 /*
7432  * Initialize the values to be used by the client in CREATE_SESSION
7433  * If nfs4_init_session set the fore channel request and response sizes,
7434  * use them.
7435  *
7436  * Set the back channel max_resp_sz_cached to zero to force the client to
7437  * always set csa_cachethis to FALSE because the current implementation
7438  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7439  */
7440 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
7441                                     struct rpc_clnt *clnt)
7442 {
7443         unsigned int max_rqst_sz, max_resp_sz;
7444         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
7445
7446         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7447         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7448
7449         /* Fore channel attributes */
7450         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7451         args->fc_attrs.max_resp_sz = max_resp_sz;
7452         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7453         args->fc_attrs.max_reqs = max_session_slots;
7454
7455         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7456                 "max_ops=%u max_reqs=%u\n",
7457                 __func__,
7458                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7459                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7460
7461         /* Back channel attributes */
7462         args->bc_attrs.max_rqst_sz = max_bc_payload;
7463         args->bc_attrs.max_resp_sz = max_bc_payload;
7464         args->bc_attrs.max_resp_sz_cached = 0;
7465         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7466         args->bc_attrs.max_reqs = NFS41_BC_MAX_CALLBACKS;
7467
7468         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7469                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7470                 __func__,
7471                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7472                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7473                 args->bc_attrs.max_reqs);
7474 }
7475
7476 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
7477                 struct nfs41_create_session_res *res)
7478 {
7479         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7480         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
7481
7482         if (rcvd->max_resp_sz > sent->max_resp_sz)
7483                 return -EINVAL;
7484         /*
7485          * Our requested max_ops is the minimum we need; we're not
7486          * prepared to break up compounds into smaller pieces than that.
7487          * So, no point even trying to continue if the server won't
7488          * cooperate:
7489          */
7490         if (rcvd->max_ops < sent->max_ops)
7491                 return -EINVAL;
7492         if (rcvd->max_reqs == 0)
7493                 return -EINVAL;
7494         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7495                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7496         return 0;
7497 }
7498
7499 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
7500                 struct nfs41_create_session_res *res)
7501 {
7502         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7503         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
7504
7505         if (!(res->flags & SESSION4_BACK_CHAN))
7506                 goto out;
7507         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7508                 return -EINVAL;
7509         if (rcvd->max_resp_sz < sent->max_resp_sz)
7510                 return -EINVAL;
7511         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7512                 return -EINVAL;
7513         /* These would render the backchannel useless: */
7514         if (rcvd->max_ops != sent->max_ops)
7515                 return -EINVAL;
7516         if (rcvd->max_reqs != sent->max_reqs)
7517                 return -EINVAL;
7518 out:
7519         return 0;
7520 }
7521
7522 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7523                                      struct nfs41_create_session_res *res)
7524 {
7525         int ret;
7526
7527         ret = nfs4_verify_fore_channel_attrs(args, res);
7528         if (ret)
7529                 return ret;
7530         return nfs4_verify_back_channel_attrs(args, res);
7531 }
7532
7533 static void nfs4_update_session(struct nfs4_session *session,
7534                 struct nfs41_create_session_res *res)
7535 {
7536         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
7537         /* Mark client id and session as being confirmed */
7538         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
7539         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
7540         session->flags = res->flags;
7541         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
7542         if (res->flags & SESSION4_BACK_CHAN)
7543                 memcpy(&session->bc_attrs, &res->bc_attrs,
7544                                 sizeof(session->bc_attrs));
7545 }
7546
7547 static int _nfs4_proc_create_session(struct nfs_client *clp,
7548                 struct rpc_cred *cred)
7549 {
7550         struct nfs4_session *session = clp->cl_session;
7551         struct nfs41_create_session_args args = {
7552                 .client = clp,
7553                 .clientid = clp->cl_clientid,
7554                 .seqid = clp->cl_seqid,
7555                 .cb_program = NFS4_CALLBACK,
7556         };
7557         struct nfs41_create_session_res res;
7558
7559         struct rpc_message msg = {
7560                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7561                 .rpc_argp = &args,
7562                 .rpc_resp = &res,
7563                 .rpc_cred = cred,
7564         };
7565         int status;
7566
7567         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
7568         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7569
7570         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7571         trace_nfs4_create_session(clp, status);
7572
7573         switch (status) {
7574         case -NFS4ERR_STALE_CLIENTID:
7575         case -NFS4ERR_DELAY:
7576         case -ETIMEDOUT:
7577         case -EACCES:
7578         case -EAGAIN:
7579                 goto out;
7580         };
7581
7582         clp->cl_seqid++;
7583         if (!status) {
7584                 /* Verify the session's negotiated channel_attrs values */
7585                 status = nfs4_verify_channel_attrs(&args, &res);
7586                 /* Increment the clientid slot sequence id */
7587                 if (status)
7588                         goto out;
7589                 nfs4_update_session(session, &res);
7590         }
7591 out:
7592         return status;
7593 }
7594
7595 /*
7596  * Issues a CREATE_SESSION operation to the server.
7597  * It is the responsibility of the caller to verify the session is
7598  * expired before calling this routine.
7599  */
7600 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7601 {
7602         int status;
7603         unsigned *ptr;
7604         struct nfs4_session *session = clp->cl_session;
7605
7606         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7607
7608         status = _nfs4_proc_create_session(clp, cred);
7609         if (status)
7610                 goto out;
7611
7612         /* Init or reset the session slot tables */
7613         status = nfs4_setup_session_slot_tables(session);
7614         dprintk("slot table setup returned %d\n", status);
7615         if (status)
7616                 goto out;
7617
7618         ptr = (unsigned *)&session->sess_id.data[0];
7619         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7620                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7621 out:
7622         dprintk("<-- %s\n", __func__);
7623         return status;
7624 }
7625
7626 /*
7627  * Issue the over-the-wire RPC DESTROY_SESSION.
7628  * The caller must serialize access to this routine.
7629  */
7630 int nfs4_proc_destroy_session(struct nfs4_session *session,
7631                 struct rpc_cred *cred)
7632 {
7633         struct rpc_message msg = {
7634                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7635                 .rpc_argp = session,
7636                 .rpc_cred = cred,
7637         };
7638         int status = 0;
7639
7640         dprintk("--> nfs4_proc_destroy_session\n");
7641
7642         /* session is still being setup */
7643         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
7644                 return 0;
7645
7646         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7647         trace_nfs4_destroy_session(session->clp, status);
7648
7649         if (status)
7650                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7651                         "Session has been destroyed regardless...\n", status);
7652
7653         dprintk("<-- nfs4_proc_destroy_session\n");
7654         return status;
7655 }
7656
7657 /*
7658  * Renew the cl_session lease.
7659  */
7660 struct nfs4_sequence_data {
7661         struct nfs_client *clp;
7662         struct nfs4_sequence_args args;
7663         struct nfs4_sequence_res res;
7664 };
7665
7666 static void nfs41_sequence_release(void *data)
7667 {
7668         struct nfs4_sequence_data *calldata = data;
7669         struct nfs_client *clp = calldata->clp;
7670
7671         if (atomic_read(&clp->cl_count) > 1)
7672                 nfs4_schedule_state_renewal(clp);
7673         nfs_put_client(clp);
7674         kfree(calldata);
7675 }
7676
7677 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7678 {
7679         switch(task->tk_status) {
7680         case -NFS4ERR_DELAY:
7681                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7682                 return -EAGAIN;
7683         default:
7684                 nfs4_schedule_lease_recovery(clp);
7685         }
7686         return 0;
7687 }
7688
7689 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7690 {
7691         struct nfs4_sequence_data *calldata = data;
7692         struct nfs_client *clp = calldata->clp;
7693
7694         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7695                 return;
7696
7697         trace_nfs4_sequence(clp, task->tk_status);
7698         if (task->tk_status < 0) {
7699                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7700                 if (atomic_read(&clp->cl_count) == 1)
7701                         goto out;
7702
7703                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7704                         rpc_restart_call_prepare(task);
7705                         return;
7706                 }
7707         }
7708         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7709 out:
7710         dprintk("<-- %s\n", __func__);
7711 }
7712
7713 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7714 {
7715         struct nfs4_sequence_data *calldata = data;
7716         struct nfs_client *clp = calldata->clp;
7717         struct nfs4_sequence_args *args;
7718         struct nfs4_sequence_res *res;
7719
7720         args = task->tk_msg.rpc_argp;
7721         res = task->tk_msg.rpc_resp;
7722
7723         nfs41_setup_sequence(clp->cl_session, args, res, task);
7724 }
7725
7726 static const struct rpc_call_ops nfs41_sequence_ops = {
7727         .rpc_call_done = nfs41_sequence_call_done,
7728         .rpc_call_prepare = nfs41_sequence_prepare,
7729         .rpc_release = nfs41_sequence_release,
7730 };
7731
7732 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7733                 struct rpc_cred *cred,
7734                 bool is_privileged)
7735 {
7736         struct nfs4_sequence_data *calldata;
7737         struct rpc_message msg = {
7738                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7739                 .rpc_cred = cred,
7740         };
7741         struct rpc_task_setup task_setup_data = {
7742                 .rpc_client = clp->cl_rpcclient,
7743                 .rpc_message = &msg,
7744                 .callback_ops = &nfs41_sequence_ops,
7745                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7746         };
7747
7748         if (!atomic_inc_not_zero(&clp->cl_count))
7749                 return ERR_PTR(-EIO);
7750         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7751         if (calldata == NULL) {
7752                 nfs_put_client(clp);
7753                 return ERR_PTR(-ENOMEM);
7754         }
7755         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7756         if (is_privileged)
7757                 nfs4_set_sequence_privileged(&calldata->args);
7758         msg.rpc_argp = &calldata->args;
7759         msg.rpc_resp = &calldata->res;
7760         calldata->clp = clp;
7761         task_setup_data.callback_data = calldata;
7762
7763         return rpc_run_task(&task_setup_data);
7764 }
7765
7766 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7767 {
7768         struct rpc_task *task;
7769         int ret = 0;
7770
7771         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7772                 return -EAGAIN;
7773         task = _nfs41_proc_sequence(clp, cred, false);
7774         if (IS_ERR(task))
7775                 ret = PTR_ERR(task);
7776         else
7777                 rpc_put_task_async(task);
7778         dprintk("<-- %s status=%d\n", __func__, ret);
7779         return ret;
7780 }
7781
7782 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7783 {
7784         struct rpc_task *task;
7785         int ret;
7786
7787         task = _nfs41_proc_sequence(clp, cred, true);
7788         if (IS_ERR(task)) {
7789                 ret = PTR_ERR(task);
7790                 goto out;
7791         }
7792         ret = rpc_wait_for_completion_task(task);
7793         if (!ret)
7794                 ret = task->tk_status;
7795         rpc_put_task(task);
7796 out:
7797         dprintk("<-- %s status=%d\n", __func__, ret);
7798         return ret;
7799 }
7800
7801 struct nfs4_reclaim_complete_data {
7802         struct nfs_client *clp;
7803         struct nfs41_reclaim_complete_args arg;
7804         struct nfs41_reclaim_complete_res res;
7805 };
7806
7807 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7808 {
7809         struct nfs4_reclaim_complete_data *calldata = data;
7810
7811         nfs41_setup_sequence(calldata->clp->cl_session,
7812                         &calldata->arg.seq_args,
7813                         &calldata->res.seq_res,
7814                         task);
7815 }
7816
7817 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7818 {
7819         switch(task->tk_status) {
7820         case 0:
7821         case -NFS4ERR_COMPLETE_ALREADY:
7822         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7823                 break;
7824         case -NFS4ERR_DELAY:
7825                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7826                 /* fall through */
7827         case -NFS4ERR_RETRY_UNCACHED_REP:
7828                 return -EAGAIN;
7829         default:
7830                 nfs4_schedule_lease_recovery(clp);
7831         }
7832         return 0;
7833 }
7834
7835 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7836 {
7837         struct nfs4_reclaim_complete_data *calldata = data;
7838         struct nfs_client *clp = calldata->clp;
7839         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7840
7841         dprintk("--> %s\n", __func__);
7842         if (!nfs41_sequence_done(task, res))
7843                 return;
7844
7845         trace_nfs4_reclaim_complete(clp, task->tk_status);
7846         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7847                 rpc_restart_call_prepare(task);
7848                 return;
7849         }
7850         dprintk("<-- %s\n", __func__);
7851 }
7852
7853 static void nfs4_free_reclaim_complete_data(void *data)
7854 {
7855         struct nfs4_reclaim_complete_data *calldata = data;
7856
7857         kfree(calldata);
7858 }
7859
7860 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7861         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7862         .rpc_call_done = nfs4_reclaim_complete_done,
7863         .rpc_release = nfs4_free_reclaim_complete_data,
7864 };
7865
7866 /*
7867  * Issue a global reclaim complete.
7868  */
7869 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7870                 struct rpc_cred *cred)
7871 {
7872         struct nfs4_reclaim_complete_data *calldata;
7873         struct rpc_task *task;
7874         struct rpc_message msg = {
7875                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7876                 .rpc_cred = cred,
7877         };
7878         struct rpc_task_setup task_setup_data = {
7879                 .rpc_client = clp->cl_rpcclient,
7880                 .rpc_message = &msg,
7881                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7882                 .flags = RPC_TASK_ASYNC,
7883         };
7884         int status = -ENOMEM;
7885
7886         dprintk("--> %s\n", __func__);
7887         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7888         if (calldata == NULL)
7889                 goto out;
7890         calldata->clp = clp;
7891         calldata->arg.one_fs = 0;
7892
7893         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7894         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7895         msg.rpc_argp = &calldata->arg;
7896         msg.rpc_resp = &calldata->res;
7897         task_setup_data.callback_data = calldata;
7898         task = rpc_run_task(&task_setup_data);
7899         if (IS_ERR(task)) {
7900                 status = PTR_ERR(task);
7901                 goto out;
7902         }
7903         status = nfs4_wait_for_completion_rpc_task(task);
7904         if (status == 0)
7905                 status = task->tk_status;
7906         rpc_put_task(task);
7907         return 0;
7908 out:
7909         dprintk("<-- %s status=%d\n", __func__, status);
7910         return status;
7911 }
7912
7913 static void
7914 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7915 {
7916         struct nfs4_layoutget *lgp = calldata;
7917         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7918         struct nfs4_session *session = nfs4_get_session(server);
7919
7920         dprintk("--> %s\n", __func__);
7921         nfs41_setup_sequence(session, &lgp->args.seq_args,
7922                                 &lgp->res.seq_res, task);
7923         dprintk("<-- %s\n", __func__);
7924 }
7925
7926 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7927 {
7928         struct nfs4_layoutget *lgp = calldata;
7929
7930         dprintk("--> %s\n", __func__);
7931         nfs41_sequence_process(task, &lgp->res.seq_res);
7932         dprintk("<-- %s\n", __func__);
7933 }
7934
7935 static int
7936 nfs4_layoutget_handle_exception(struct rpc_task *task,
7937                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
7938 {
7939         struct inode *inode = lgp->args.inode;
7940         struct nfs_server *server = NFS_SERVER(inode);
7941         struct pnfs_layout_hdr *lo;
7942         int nfs4err = task->tk_status;
7943         int err, status = 0;
7944         LIST_HEAD(head);
7945
7946         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7947
7948         switch (nfs4err) {
7949         case 0:
7950                 goto out;
7951
7952         /*
7953          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
7954          * on the file. set tk_status to -ENODATA to tell upper layer to
7955          * retry go inband.
7956          */
7957         case -NFS4ERR_LAYOUTUNAVAILABLE:
7958                 status = -ENODATA;
7959                 goto out;
7960         /*
7961          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
7962          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
7963          */
7964         case -NFS4ERR_BADLAYOUT:
7965                 status = -EOVERFLOW;
7966                 goto out;
7967         /*
7968          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7969          * (or clients) writing to the same RAID stripe except when
7970          * the minlength argument is 0 (see RFC5661 section 18.43.3).
7971          *
7972          * Treat it like we would RECALLCONFLICT -- we retry for a little
7973          * while, and then eventually give up.
7974          */
7975         case -NFS4ERR_LAYOUTTRYLATER:
7976                 if (lgp->args.minlength == 0) {
7977                         status = -EOVERFLOW;
7978                         goto out;
7979                 }
7980                 status = -EBUSY;
7981                 break;
7982         case -NFS4ERR_RECALLCONFLICT:
7983                 status = -ERECALLCONFLICT;
7984                 break;
7985         case -NFS4ERR_EXPIRED:
7986         case -NFS4ERR_BAD_STATEID:
7987                 exception->timeout = 0;
7988                 spin_lock(&inode->i_lock);
7989                 lo = NFS_I(inode)->layout;
7990                 /* If the open stateid was bad, then recover it. */
7991                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
7992                     nfs4_stateid_match_other(&lgp->args.stateid,
7993                                         &lgp->args.ctx->state->stateid)) {
7994                         spin_unlock(&inode->i_lock);
7995                         exception->state = lgp->args.ctx->state;
7996                         break;
7997                 }
7998
7999                 /*
8000                  * Mark the bad layout state as invalid, then retry
8001                  */
8002                 pnfs_mark_layout_stateid_invalid(lo, &head);
8003                 spin_unlock(&inode->i_lock);
8004                 pnfs_free_lseg_list(&head);
8005                 status = -EAGAIN;
8006                 goto out;
8007         }
8008
8009         err = nfs4_handle_exception(server, nfs4err, exception);
8010         if (!status) {
8011                 if (exception->retry)
8012                         status = -EAGAIN;
8013                 else
8014                         status = err;
8015         }
8016 out:
8017         dprintk("<-- %s\n", __func__);
8018         return status;
8019 }
8020
8021 static size_t max_response_pages(struct nfs_server *server)
8022 {
8023         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
8024         return nfs_page_array_len(0, max_resp_sz);
8025 }
8026
8027 static void nfs4_free_pages(struct page **pages, size_t size)
8028 {
8029         int i;
8030
8031         if (!pages)
8032                 return;
8033
8034         for (i = 0; i < size; i++) {
8035                 if (!pages[i])
8036                         break;
8037                 __free_page(pages[i]);
8038         }
8039         kfree(pages);
8040 }
8041
8042 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
8043 {
8044         struct page **pages;
8045         int i;
8046
8047         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
8048         if (!pages) {
8049                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
8050                 return NULL;
8051         }
8052
8053         for (i = 0; i < size; i++) {
8054                 pages[i] = alloc_page(gfp_flags);
8055                 if (!pages[i]) {
8056                         dprintk("%s: failed to allocate page\n", __func__);
8057                         nfs4_free_pages(pages, size);
8058                         return NULL;
8059                 }
8060         }
8061
8062         return pages;
8063 }
8064
8065 static void nfs4_layoutget_release(void *calldata)
8066 {
8067         struct nfs4_layoutget *lgp = calldata;
8068         struct inode *inode = lgp->args.inode;
8069         struct nfs_server *server = NFS_SERVER(inode);
8070         size_t max_pages = max_response_pages(server);
8071
8072         dprintk("--> %s\n", __func__);
8073         nfs4_free_pages(lgp->args.layout.pages, max_pages);
8074         pnfs_put_layout_hdr(NFS_I(inode)->layout);
8075         put_nfs_open_context(lgp->args.ctx);
8076         kfree(calldata);
8077         dprintk("<-- %s\n", __func__);
8078 }
8079
8080 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
8081         .rpc_call_prepare = nfs4_layoutget_prepare,
8082         .rpc_call_done = nfs4_layoutget_done,
8083         .rpc_release = nfs4_layoutget_release,
8084 };
8085
8086 struct pnfs_layout_segment *
8087 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags)
8088 {
8089         struct inode *inode = lgp->args.inode;
8090         struct nfs_server *server = NFS_SERVER(inode);
8091         size_t max_pages = max_response_pages(server);
8092         struct rpc_task *task;
8093         struct rpc_message msg = {
8094                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
8095                 .rpc_argp = &lgp->args,
8096                 .rpc_resp = &lgp->res,
8097                 .rpc_cred = lgp->cred,
8098         };
8099         struct rpc_task_setup task_setup_data = {
8100                 .rpc_client = server->client,
8101                 .rpc_message = &msg,
8102                 .callback_ops = &nfs4_layoutget_call_ops,
8103                 .callback_data = lgp,
8104                 .flags = RPC_TASK_ASYNC,
8105         };
8106         struct pnfs_layout_segment *lseg = NULL;
8107         struct nfs4_exception exception = {
8108                 .inode = inode,
8109                 .timeout = *timeout,
8110         };
8111         int status = 0;
8112
8113         dprintk("--> %s\n", __func__);
8114
8115         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
8116         pnfs_get_layout_hdr(NFS_I(inode)->layout);
8117
8118         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
8119         if (!lgp->args.layout.pages) {
8120                 nfs4_layoutget_release(lgp);
8121                 return ERR_PTR(-ENOMEM);
8122         }
8123         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
8124
8125         lgp->res.layoutp = &lgp->args.layout;
8126         lgp->res.seq_res.sr_slot = NULL;
8127         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
8128
8129         task = rpc_run_task(&task_setup_data);
8130         if (IS_ERR(task))
8131                 return ERR_CAST(task);
8132         status = nfs4_wait_for_completion_rpc_task(task);
8133         if (status == 0) {
8134                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
8135                 *timeout = exception.timeout;
8136         }
8137
8138         trace_nfs4_layoutget(lgp->args.ctx,
8139                         &lgp->args.range,
8140                         &lgp->res.range,
8141                         &lgp->res.stateid,
8142                         status);
8143
8144         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
8145         if (status == 0 && lgp->res.layoutp->len)
8146                 lseg = pnfs_layout_process(lgp);
8147         nfs4_sequence_free_slot(&lgp->res.seq_res);
8148         rpc_put_task(task);
8149         dprintk("<-- %s status=%d\n", __func__, status);
8150         if (status)
8151                 return ERR_PTR(status);
8152         return lseg;
8153 }
8154
8155 static void
8156 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
8157 {
8158         struct nfs4_layoutreturn *lrp = calldata;
8159
8160         dprintk("--> %s\n", __func__);
8161         nfs41_setup_sequence(lrp->clp->cl_session,
8162                         &lrp->args.seq_args,
8163                         &lrp->res.seq_res,
8164                         task);
8165 }
8166
8167 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
8168 {
8169         struct nfs4_layoutreturn *lrp = calldata;
8170         struct nfs_server *server;
8171
8172         dprintk("--> %s\n", __func__);
8173
8174         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
8175                 return;
8176
8177         server = NFS_SERVER(lrp->args.inode);
8178         switch (task->tk_status) {
8179         default:
8180                 task->tk_status = 0;
8181         case 0:
8182                 break;
8183         case -NFS4ERR_DELAY:
8184                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
8185                         break;
8186                 nfs4_sequence_free_slot(&lrp->res.seq_res);
8187                 rpc_restart_call_prepare(task);
8188                 return;
8189         }
8190         dprintk("<-- %s\n", __func__);
8191 }
8192
8193 static void nfs4_layoutreturn_release(void *calldata)
8194 {
8195         struct nfs4_layoutreturn *lrp = calldata;
8196         struct pnfs_layout_hdr *lo = lrp->args.layout;
8197         LIST_HEAD(freeme);
8198
8199         dprintk("--> %s\n", __func__);
8200         spin_lock(&lo->plh_inode->i_lock);
8201         if (lrp->res.lrs_present) {
8202                 pnfs_mark_matching_lsegs_invalid(lo, &freeme,
8203                                 &lrp->args.range,
8204                                 be32_to_cpu(lrp->args.stateid.seqid));
8205                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
8206         } else
8207                 pnfs_mark_layout_stateid_invalid(lo, &freeme);
8208         pnfs_clear_layoutreturn_waitbit(lo);
8209         spin_unlock(&lo->plh_inode->i_lock);
8210         nfs4_sequence_free_slot(&lrp->res.seq_res);
8211         pnfs_free_lseg_list(&freeme);
8212         pnfs_put_layout_hdr(lrp->args.layout);
8213         nfs_iput_and_deactive(lrp->inode);
8214         kfree(calldata);
8215         dprintk("<-- %s\n", __func__);
8216 }
8217
8218 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
8219         .rpc_call_prepare = nfs4_layoutreturn_prepare,
8220         .rpc_call_done = nfs4_layoutreturn_done,
8221         .rpc_release = nfs4_layoutreturn_release,
8222 };
8223
8224 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
8225 {
8226         struct rpc_task *task;
8227         struct rpc_message msg = {
8228                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
8229                 .rpc_argp = &lrp->args,
8230                 .rpc_resp = &lrp->res,
8231                 .rpc_cred = lrp->cred,
8232         };
8233         struct rpc_task_setup task_setup_data = {
8234                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
8235                 .rpc_message = &msg,
8236                 .callback_ops = &nfs4_layoutreturn_call_ops,
8237                 .callback_data = lrp,
8238         };
8239         int status = 0;
8240
8241         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
8242                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
8243                         &task_setup_data.rpc_client, &msg);
8244
8245         dprintk("--> %s\n", __func__);
8246         if (!sync) {
8247                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
8248                 if (!lrp->inode) {
8249                         nfs4_layoutreturn_release(lrp);
8250                         return -EAGAIN;
8251                 }
8252                 task_setup_data.flags |= RPC_TASK_ASYNC;
8253         }
8254         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
8255         task = rpc_run_task(&task_setup_data);
8256         if (IS_ERR(task))
8257                 return PTR_ERR(task);
8258         if (sync)
8259                 status = task->tk_status;
8260         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
8261         dprintk("<-- %s status=%d\n", __func__, status);
8262         rpc_put_task(task);
8263         return status;
8264 }
8265
8266 static int
8267 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
8268                 struct pnfs_device *pdev,
8269                 struct rpc_cred *cred)
8270 {
8271         struct nfs4_getdeviceinfo_args args = {
8272                 .pdev = pdev,
8273                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
8274                         NOTIFY_DEVICEID4_DELETE,
8275         };
8276         struct nfs4_getdeviceinfo_res res = {
8277                 .pdev = pdev,
8278         };
8279         struct rpc_message msg = {
8280                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
8281                 .rpc_argp = &args,
8282                 .rpc_resp = &res,
8283                 .rpc_cred = cred,
8284         };
8285         int status;
8286
8287         dprintk("--> %s\n", __func__);
8288         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
8289         if (res.notification & ~args.notify_types)
8290                 dprintk("%s: unsupported notification\n", __func__);
8291         if (res.notification != args.notify_types)
8292                 pdev->nocache = 1;
8293
8294         dprintk("<-- %s status=%d\n", __func__, status);
8295
8296         return status;
8297 }
8298
8299 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
8300                 struct pnfs_device *pdev,
8301                 struct rpc_cred *cred)
8302 {
8303         struct nfs4_exception exception = { };
8304         int err;
8305
8306         do {
8307                 err = nfs4_handle_exception(server,
8308                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
8309                                         &exception);
8310         } while (exception.retry);
8311         return err;
8312 }
8313 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
8314
8315 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
8316 {
8317         struct nfs4_layoutcommit_data *data = calldata;
8318         struct nfs_server *server = NFS_SERVER(data->args.inode);
8319         struct nfs4_session *session = nfs4_get_session(server);
8320
8321         nfs41_setup_sequence(session,
8322                         &data->args.seq_args,
8323                         &data->res.seq_res,
8324                         task);
8325 }
8326
8327 static void
8328 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
8329 {
8330         struct nfs4_layoutcommit_data *data = calldata;
8331         struct nfs_server *server = NFS_SERVER(data->args.inode);
8332
8333         if (!nfs41_sequence_done(task, &data->res.seq_res))
8334                 return;
8335
8336         switch (task->tk_status) { /* Just ignore these failures */
8337         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
8338         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
8339         case -NFS4ERR_BADLAYOUT:     /* no layout */
8340         case -NFS4ERR_GRACE:        /* loca_recalim always false */
8341                 task->tk_status = 0;
8342         case 0:
8343                 break;
8344         default:
8345                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
8346                         rpc_restart_call_prepare(task);
8347                         return;
8348                 }
8349         }
8350 }
8351
8352 static void nfs4_layoutcommit_release(void *calldata)
8353 {
8354         struct nfs4_layoutcommit_data *data = calldata;
8355
8356         pnfs_cleanup_layoutcommit(data);
8357         nfs_post_op_update_inode_force_wcc(data->args.inode,
8358                                            data->res.fattr);
8359         put_rpccred(data->cred);
8360         nfs_iput_and_deactive(data->inode);
8361         kfree(data);
8362 }
8363
8364 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
8365         .rpc_call_prepare = nfs4_layoutcommit_prepare,
8366         .rpc_call_done = nfs4_layoutcommit_done,
8367         .rpc_release = nfs4_layoutcommit_release,
8368 };
8369
8370 int
8371 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
8372 {
8373         struct rpc_message msg = {
8374                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
8375                 .rpc_argp = &data->args,
8376                 .rpc_resp = &data->res,
8377                 .rpc_cred = data->cred,
8378         };
8379         struct rpc_task_setup task_setup_data = {
8380                 .task = &data->task,
8381                 .rpc_client = NFS_CLIENT(data->args.inode),
8382                 .rpc_message = &msg,
8383                 .callback_ops = &nfs4_layoutcommit_ops,
8384                 .callback_data = data,
8385         };
8386         struct rpc_task *task;
8387         int status = 0;
8388
8389         dprintk("NFS: initiating layoutcommit call. sync %d "
8390                 "lbw: %llu inode %lu\n", sync,
8391                 data->args.lastbytewritten,
8392                 data->args.inode->i_ino);
8393
8394         if (!sync) {
8395                 data->inode = nfs_igrab_and_active(data->args.inode);
8396                 if (data->inode == NULL) {
8397                         nfs4_layoutcommit_release(data);
8398                         return -EAGAIN;
8399                 }
8400                 task_setup_data.flags = RPC_TASK_ASYNC;
8401         }
8402         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8403         task = rpc_run_task(&task_setup_data);
8404         if (IS_ERR(task))
8405                 return PTR_ERR(task);
8406         if (sync)
8407                 status = task->tk_status;
8408         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
8409         dprintk("%s: status %d\n", __func__, status);
8410         rpc_put_task(task);
8411         return status;
8412 }
8413
8414 /**
8415  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8416  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8417  */
8418 static int
8419 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8420                     struct nfs_fsinfo *info,
8421                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8422 {
8423         struct nfs41_secinfo_no_name_args args = {
8424                 .style = SECINFO_STYLE_CURRENT_FH,
8425         };
8426         struct nfs4_secinfo_res res = {
8427                 .flavors = flavors,
8428         };
8429         struct rpc_message msg = {
8430                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8431                 .rpc_argp = &args,
8432                 .rpc_resp = &res,
8433         };
8434         struct rpc_clnt *clnt = server->client;
8435         struct rpc_cred *cred = NULL;
8436         int status;
8437
8438         if (use_integrity) {
8439                 clnt = server->nfs_client->cl_rpcclient;
8440                 cred = nfs4_get_clid_cred(server->nfs_client);
8441                 msg.rpc_cred = cred;
8442         }
8443
8444         dprintk("--> %s\n", __func__);
8445         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8446                                 &res.seq_res, 0);
8447         dprintk("<-- %s status=%d\n", __func__, status);
8448
8449         if (cred)
8450                 put_rpccred(cred);
8451
8452         return status;
8453 }
8454
8455 static int
8456 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8457                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8458 {
8459         struct nfs4_exception exception = { };
8460         int err;
8461         do {
8462                 /* first try using integrity protection */
8463                 err = -NFS4ERR_WRONGSEC;
8464
8465                 /* try to use integrity protection with machine cred */
8466                 if (_nfs4_is_integrity_protected(server->nfs_client))
8467                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8468                                                           flavors, true);
8469
8470                 /*
8471                  * if unable to use integrity protection, or SECINFO with
8472                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8473                  * disallowed by spec, but exists in deployed servers) use
8474                  * the current filesystem's rpc_client and the user cred.
8475                  */
8476                 if (err == -NFS4ERR_WRONGSEC)
8477                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8478                                                           flavors, false);
8479
8480                 switch (err) {
8481                 case 0:
8482                 case -NFS4ERR_WRONGSEC:
8483                 case -ENOTSUPP:
8484                         goto out;
8485                 default:
8486                         err = nfs4_handle_exception(server, err, &exception);
8487                 }
8488         } while (exception.retry);
8489 out:
8490         return err;
8491 }
8492
8493 static int
8494 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8495                     struct nfs_fsinfo *info)
8496 {
8497         int err;
8498         struct page *page;
8499         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8500         struct nfs4_secinfo_flavors *flavors;
8501         struct nfs4_secinfo4 *secinfo;
8502         int i;
8503
8504         page = alloc_page(GFP_KERNEL);
8505         if (!page) {
8506                 err = -ENOMEM;
8507                 goto out;
8508         }
8509
8510         flavors = page_address(page);
8511         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8512
8513         /*
8514          * Fall back on "guess and check" method if
8515          * the server doesn't support SECINFO_NO_NAME
8516          */
8517         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8518                 err = nfs4_find_root_sec(server, fhandle, info);
8519                 goto out_freepage;
8520         }
8521         if (err)
8522                 goto out_freepage;
8523
8524         for (i = 0; i < flavors->num_flavors; i++) {
8525                 secinfo = &flavors->flavors[i];
8526
8527                 switch (secinfo->flavor) {
8528                 case RPC_AUTH_NULL:
8529                 case RPC_AUTH_UNIX:
8530                 case RPC_AUTH_GSS:
8531                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8532                                         &secinfo->flavor_info);
8533                         break;
8534                 default:
8535                         flavor = RPC_AUTH_MAXFLAVOR;
8536                         break;
8537                 }
8538
8539                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8540                         flavor = RPC_AUTH_MAXFLAVOR;
8541
8542                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8543                         err = nfs4_lookup_root_sec(server, fhandle,
8544                                                    info, flavor);
8545                         if (!err)
8546                                 break;
8547                 }
8548         }
8549
8550         if (flavor == RPC_AUTH_MAXFLAVOR)
8551                 err = -EPERM;
8552
8553 out_freepage:
8554         put_page(page);
8555         if (err == -EACCES)
8556                 return -EPERM;
8557 out:
8558         return err;
8559 }
8560
8561 static int _nfs41_test_stateid(struct nfs_server *server,
8562                 nfs4_stateid *stateid,
8563                 struct rpc_cred *cred)
8564 {
8565         int status;
8566         struct nfs41_test_stateid_args args = {
8567                 .stateid = stateid,
8568         };
8569         struct nfs41_test_stateid_res res;
8570         struct rpc_message msg = {
8571                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8572                 .rpc_argp = &args,
8573                 .rpc_resp = &res,
8574                 .rpc_cred = cred,
8575         };
8576         struct rpc_clnt *rpc_client = server->client;
8577
8578         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8579                 &rpc_client, &msg);
8580
8581         dprintk("NFS call  test_stateid %p\n", stateid);
8582         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8583         nfs4_set_sequence_privileged(&args.seq_args);
8584         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8585                         &args.seq_args, &res.seq_res);
8586         if (status != NFS_OK) {
8587                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8588                 return status;
8589         }
8590         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8591         return -res.status;
8592 }
8593
8594 /**
8595  * nfs41_test_stateid - perform a TEST_STATEID operation
8596  *
8597  * @server: server / transport on which to perform the operation
8598  * @stateid: state ID to test
8599  * @cred: credential
8600  *
8601  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8602  * Otherwise a negative NFS4ERR value is returned if the operation
8603  * failed or the state ID is not currently valid.
8604  */
8605 static int nfs41_test_stateid(struct nfs_server *server,
8606                 nfs4_stateid *stateid,
8607                 struct rpc_cred *cred)
8608 {
8609         struct nfs4_exception exception = { };
8610         int err;
8611         do {
8612                 err = _nfs41_test_stateid(server, stateid, cred);
8613                 if (err != -NFS4ERR_DELAY)
8614                         break;
8615                 nfs4_handle_exception(server, err, &exception);
8616         } while (exception.retry);
8617         return err;
8618 }
8619
8620 struct nfs_free_stateid_data {
8621         struct nfs_server *server;
8622         struct nfs41_free_stateid_args args;
8623         struct nfs41_free_stateid_res res;
8624 };
8625
8626 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8627 {
8628         struct nfs_free_stateid_data *data = calldata;
8629         nfs41_setup_sequence(nfs4_get_session(data->server),
8630                         &data->args.seq_args,
8631                         &data->res.seq_res,
8632                         task);
8633 }
8634
8635 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8636 {
8637         struct nfs_free_stateid_data *data = calldata;
8638
8639         nfs41_sequence_done(task, &data->res.seq_res);
8640
8641         switch (task->tk_status) {
8642         case -NFS4ERR_DELAY:
8643                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8644                         rpc_restart_call_prepare(task);
8645         }
8646 }
8647
8648 static void nfs41_free_stateid_release(void *calldata)
8649 {
8650         kfree(calldata);
8651 }
8652
8653 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8654         .rpc_call_prepare = nfs41_free_stateid_prepare,
8655         .rpc_call_done = nfs41_free_stateid_done,
8656         .rpc_release = nfs41_free_stateid_release,
8657 };
8658
8659 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8660                 nfs4_stateid *stateid,
8661                 struct rpc_cred *cred,
8662                 bool privileged)
8663 {
8664         struct rpc_message msg = {
8665                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8666                 .rpc_cred = cred,
8667         };
8668         struct rpc_task_setup task_setup = {
8669                 .rpc_client = server->client,
8670                 .rpc_message = &msg,
8671                 .callback_ops = &nfs41_free_stateid_ops,
8672                 .flags = RPC_TASK_ASYNC,
8673         };
8674         struct nfs_free_stateid_data *data;
8675
8676         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8677                 &task_setup.rpc_client, &msg);
8678
8679         dprintk("NFS call  free_stateid %p\n", stateid);
8680         data = kmalloc(sizeof(*data), GFP_NOFS);
8681         if (!data)
8682                 return ERR_PTR(-ENOMEM);
8683         data->server = server;
8684         nfs4_stateid_copy(&data->args.stateid, stateid);
8685
8686         task_setup.callback_data = data;
8687
8688         msg.rpc_argp = &data->args;
8689         msg.rpc_resp = &data->res;
8690         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8691         if (privileged)
8692                 nfs4_set_sequence_privileged(&data->args.seq_args);
8693
8694         return rpc_run_task(&task_setup);
8695 }
8696
8697 /**
8698  * nfs41_free_stateid - perform a FREE_STATEID operation
8699  *
8700  * @server: server / transport on which to perform the operation
8701  * @stateid: state ID to release
8702  * @cred: credential
8703  *
8704  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8705  * negative NFS4ERR value is returned.
8706  */
8707 static int nfs41_free_stateid(struct nfs_server *server,
8708                 nfs4_stateid *stateid,
8709                 struct rpc_cred *cred)
8710 {
8711         struct rpc_task *task;
8712         int ret;
8713
8714         task = _nfs41_free_stateid(server, stateid, cred, true);
8715         if (IS_ERR(task))
8716                 return PTR_ERR(task);
8717         ret = rpc_wait_for_completion_task(task);
8718         if (!ret)
8719                 ret = task->tk_status;
8720         rpc_put_task(task);
8721         return ret;
8722 }
8723
8724 static void
8725 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8726 {
8727         struct rpc_task *task;
8728         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8729
8730         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8731         nfs4_free_lock_state(server, lsp);
8732         if (IS_ERR(task))
8733                 return;
8734         rpc_put_task(task);
8735 }
8736
8737 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8738                 const nfs4_stateid *s2)
8739 {
8740         if (s1->type != s2->type)
8741                 return false;
8742
8743         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8744                 return false;
8745
8746         if (s1->seqid == s2->seqid)
8747                 return true;
8748         if (s1->seqid == 0 || s2->seqid == 0)
8749                 return true;
8750
8751         return false;
8752 }
8753
8754 #endif /* CONFIG_NFS_V4_1 */
8755
8756 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8757                 const nfs4_stateid *s2)
8758 {
8759         return nfs4_stateid_match(s1, s2);
8760 }
8761
8762
8763 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8764         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8765         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8766         .recover_open   = nfs4_open_reclaim,
8767         .recover_lock   = nfs4_lock_reclaim,
8768         .establish_clid = nfs4_init_clientid,
8769         .detect_trunking = nfs40_discover_server_trunking,
8770 };
8771
8772 #if defined(CONFIG_NFS_V4_1)
8773 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8774         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8775         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8776         .recover_open   = nfs4_open_reclaim,
8777         .recover_lock   = nfs4_lock_reclaim,
8778         .establish_clid = nfs41_init_clientid,
8779         .reclaim_complete = nfs41_proc_reclaim_complete,
8780         .detect_trunking = nfs41_discover_server_trunking,
8781 };
8782 #endif /* CONFIG_NFS_V4_1 */
8783
8784 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8785         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8786         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8787         .recover_open   = nfs40_open_expired,
8788         .recover_lock   = nfs4_lock_expired,
8789         .establish_clid = nfs4_init_clientid,
8790 };
8791
8792 #if defined(CONFIG_NFS_V4_1)
8793 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8794         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8795         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8796         .recover_open   = nfs41_open_expired,
8797         .recover_lock   = nfs41_lock_expired,
8798         .establish_clid = nfs41_init_clientid,
8799 };
8800 #endif /* CONFIG_NFS_V4_1 */
8801
8802 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8803         .sched_state_renewal = nfs4_proc_async_renew,
8804         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8805         .renew_lease = nfs4_proc_renew,
8806 };
8807
8808 #if defined(CONFIG_NFS_V4_1)
8809 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8810         .sched_state_renewal = nfs41_proc_async_sequence,
8811         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8812         .renew_lease = nfs4_proc_sequence,
8813 };
8814 #endif
8815
8816 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8817         .get_locations = _nfs40_proc_get_locations,
8818         .fsid_present = _nfs40_proc_fsid_present,
8819 };
8820
8821 #if defined(CONFIG_NFS_V4_1)
8822 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8823         .get_locations = _nfs41_proc_get_locations,
8824         .fsid_present = _nfs41_proc_fsid_present,
8825 };
8826 #endif  /* CONFIG_NFS_V4_1 */
8827
8828 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8829         .minor_version = 0,
8830         .init_caps = NFS_CAP_READDIRPLUS
8831                 | NFS_CAP_ATOMIC_OPEN
8832                 | NFS_CAP_POSIX_LOCK,
8833         .init_client = nfs40_init_client,
8834         .shutdown_client = nfs40_shutdown_client,
8835         .match_stateid = nfs4_match_stateid,
8836         .find_root_sec = nfs4_find_root_sec,
8837         .free_lock_state = nfs4_release_lockowner,
8838         .alloc_seqid = nfs_alloc_seqid,
8839         .call_sync_ops = &nfs40_call_sync_ops,
8840         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8841         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8842         .state_renewal_ops = &nfs40_state_renewal_ops,
8843         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8844 };
8845
8846 #if defined(CONFIG_NFS_V4_1)
8847 static struct nfs_seqid *
8848 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
8849 {
8850         return NULL;
8851 }
8852
8853 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8854         .minor_version = 1,
8855         .init_caps = NFS_CAP_READDIRPLUS
8856                 | NFS_CAP_ATOMIC_OPEN
8857                 | NFS_CAP_POSIX_LOCK
8858                 | NFS_CAP_STATEID_NFSV41
8859                 | NFS_CAP_ATOMIC_OPEN_V1,
8860         .init_client = nfs41_init_client,
8861         .shutdown_client = nfs41_shutdown_client,
8862         .match_stateid = nfs41_match_stateid,
8863         .find_root_sec = nfs41_find_root_sec,
8864         .free_lock_state = nfs41_free_lock_state,
8865         .alloc_seqid = nfs_alloc_no_seqid,
8866         .call_sync_ops = &nfs41_call_sync_ops,
8867         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8868         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8869         .state_renewal_ops = &nfs41_state_renewal_ops,
8870         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8871 };
8872 #endif
8873
8874 #if defined(CONFIG_NFS_V4_2)
8875 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8876         .minor_version = 2,
8877         .init_caps = NFS_CAP_READDIRPLUS
8878                 | NFS_CAP_ATOMIC_OPEN
8879                 | NFS_CAP_POSIX_LOCK
8880                 | NFS_CAP_STATEID_NFSV41
8881                 | NFS_CAP_ATOMIC_OPEN_V1
8882                 | NFS_CAP_ALLOCATE
8883                 | NFS_CAP_COPY
8884                 | NFS_CAP_DEALLOCATE
8885                 | NFS_CAP_SEEK
8886                 | NFS_CAP_LAYOUTSTATS
8887                 | NFS_CAP_CLONE,
8888         .init_client = nfs41_init_client,
8889         .shutdown_client = nfs41_shutdown_client,
8890         .match_stateid = nfs41_match_stateid,
8891         .find_root_sec = nfs41_find_root_sec,
8892         .free_lock_state = nfs41_free_lock_state,
8893         .call_sync_ops = &nfs41_call_sync_ops,
8894         .alloc_seqid = nfs_alloc_no_seqid,
8895         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8896         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8897         .state_renewal_ops = &nfs41_state_renewal_ops,
8898         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8899 };
8900 #endif
8901
8902 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8903         [0] = &nfs_v4_0_minor_ops,
8904 #if defined(CONFIG_NFS_V4_1)
8905         [1] = &nfs_v4_1_minor_ops,
8906 #endif
8907 #if defined(CONFIG_NFS_V4_2)
8908         [2] = &nfs_v4_2_minor_ops,
8909 #endif
8910 };
8911
8912 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
8913 {
8914         ssize_t error, error2;
8915
8916         error = generic_listxattr(dentry, list, size);
8917         if (error < 0)
8918                 return error;
8919         if (list) {
8920                 list += error;
8921                 size -= error;
8922         }
8923
8924         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
8925         if (error2 < 0)
8926                 return error2;
8927         return error + error2;
8928 }
8929
8930 static const struct inode_operations nfs4_dir_inode_operations = {
8931         .create         = nfs_create,
8932         .lookup         = nfs_lookup,
8933         .atomic_open    = nfs_atomic_open,
8934         .link           = nfs_link,
8935         .unlink         = nfs_unlink,
8936         .symlink        = nfs_symlink,
8937         .mkdir          = nfs_mkdir,
8938         .rmdir          = nfs_rmdir,
8939         .mknod          = nfs_mknod,
8940         .rename         = nfs_rename,
8941         .permission     = nfs_permission,
8942         .getattr        = nfs_getattr,
8943         .setattr        = nfs_setattr,
8944         .getxattr       = generic_getxattr,
8945         .setxattr       = generic_setxattr,
8946         .listxattr      = nfs4_listxattr,
8947         .removexattr    = generic_removexattr,
8948 };
8949
8950 static const struct inode_operations nfs4_file_inode_operations = {
8951         .permission     = nfs_permission,
8952         .getattr        = nfs_getattr,
8953         .setattr        = nfs_setattr,
8954         .getxattr       = generic_getxattr,
8955         .setxattr       = generic_setxattr,
8956         .listxattr      = nfs4_listxattr,
8957         .removexattr    = generic_removexattr,
8958 };
8959
8960 const struct nfs_rpc_ops nfs_v4_clientops = {
8961         .version        = 4,                    /* protocol version */
8962         .dentry_ops     = &nfs4_dentry_operations,
8963         .dir_inode_ops  = &nfs4_dir_inode_operations,
8964         .file_inode_ops = &nfs4_file_inode_operations,
8965         .file_ops       = &nfs4_file_operations,
8966         .getroot        = nfs4_proc_get_root,
8967         .submount       = nfs4_submount,
8968         .try_mount      = nfs4_try_mount,
8969         .getattr        = nfs4_proc_getattr,
8970         .setattr        = nfs4_proc_setattr,
8971         .lookup         = nfs4_proc_lookup,
8972         .access         = nfs4_proc_access,
8973         .readlink       = nfs4_proc_readlink,
8974         .create         = nfs4_proc_create,
8975         .remove         = nfs4_proc_remove,
8976         .unlink_setup   = nfs4_proc_unlink_setup,
8977         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8978         .unlink_done    = nfs4_proc_unlink_done,
8979         .rename_setup   = nfs4_proc_rename_setup,
8980         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8981         .rename_done    = nfs4_proc_rename_done,
8982         .link           = nfs4_proc_link,
8983         .symlink        = nfs4_proc_symlink,
8984         .mkdir          = nfs4_proc_mkdir,
8985         .rmdir          = nfs4_proc_remove,
8986         .readdir        = nfs4_proc_readdir,
8987         .mknod          = nfs4_proc_mknod,
8988         .statfs         = nfs4_proc_statfs,
8989         .fsinfo         = nfs4_proc_fsinfo,
8990         .pathconf       = nfs4_proc_pathconf,
8991         .set_capabilities = nfs4_server_capabilities,
8992         .decode_dirent  = nfs4_decode_dirent,
8993         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8994         .read_setup     = nfs4_proc_read_setup,
8995         .read_done      = nfs4_read_done,
8996         .write_setup    = nfs4_proc_write_setup,
8997         .write_done     = nfs4_write_done,
8998         .commit_setup   = nfs4_proc_commit_setup,
8999         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
9000         .commit_done    = nfs4_commit_done,
9001         .lock           = nfs4_proc_lock,
9002         .clear_acl_cache = nfs4_zap_acl_attr,
9003         .close_context  = nfs4_close_context,
9004         .open_context   = nfs4_atomic_open,
9005         .have_delegation = nfs4_have_delegation,
9006         .return_delegation = nfs4_inode_return_delegation,
9007         .alloc_client   = nfs4_alloc_client,
9008         .init_client    = nfs4_init_client,
9009         .free_client    = nfs4_free_client,
9010         .create_server  = nfs4_create_server,
9011         .clone_server   = nfs_clone_server,
9012 };
9013
9014 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
9015         .name   = XATTR_NAME_NFSV4_ACL,
9016         .list   = nfs4_xattr_list_nfs4_acl,
9017         .get    = nfs4_xattr_get_nfs4_acl,
9018         .set    = nfs4_xattr_set_nfs4_acl,
9019 };
9020
9021 const struct xattr_handler *nfs4_xattr_handlers[] = {
9022         &nfs4_xattr_nfs4_acl_handler,
9023 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
9024         &nfs4_xattr_nfs4_label_handler,
9025 #endif
9026         NULL
9027 };
9028
9029 /*
9030  * Local variables:
9031  *  c-basic-offset: 8
9032  * End:
9033  */