fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/file.h>
  42 #include <linux/string.h>
  43 #include <linux/ratelimit.h>
  44 #include <linux/printk.h>
  45 #include <linux/slab.h>
  46 #include <linux/sunrpc/clnt.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4idmap.h"
  67 #include "nfs4session.h"
  68 #include "fscache.h"
  69
  70 #include "nfs4trace.h"
  71
  72 #define NFSDBG_FACILITY         NFSDBG_PROC
  73
  74 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  75 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  76
  77 struct nfs4_opendata;
  78 static int _nfs4_proc_open(struct nfs4_opendata *data);
  79 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  80 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  81 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  82 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  83 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  84 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  85                             struct nfs_fattr *fattr, struct iattr *sattr,
  86                             struct nfs4_state *state, struct nfs4_label *ilabel,
  87                             struct nfs4_label *olabel);
  88 #ifdef CONFIG_NFS_V4_1
  89 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
  90                 struct rpc_cred *);
  91 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
  92                 struct rpc_cred *);
  93 #endif
  94
  95 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
  96 static inline struct nfs4_label *
  97 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
  98         struct iattr *sattr, struct nfs4_label *label)
  99 {
 100         int err;
 101
 102         if (label == NULL)
 103                 return NULL;
 104
 105         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 106                 return NULL;
 107
 108         err = security_dentry_init_security(dentry, sattr->ia_mode,
 109                                 &dentry->d_name, (void **)&label->label, &label->len);
 110         if (err == 0)
 111                 return label;
 112
 113         return NULL;
 114 }
 115 static inline void
 116 nfs4_label_release_security(struct nfs4_label *label)
 117 {
 118         if (label)
 119                 security_release_secctx(label->label, label->len);
 120 }
 121 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 122 {
 123         if (label)
 124                 return server->attr_bitmask;
 125
 126         return server->attr_bitmask_nl;
 127 }
 128 #else
 129 static inline struct nfs4_label *
 130 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 131         struct iattr *sattr, struct nfs4_label *l)
 132 { return NULL; }
 133 static inline void
 134 nfs4_label_release_security(struct nfs4_label *label)
 135 { return; }
 136 static inline u32 *
 137 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 138 { return server->attr_bitmask; }
 139 #endif
 140
 141 /* Prevent leaks of NFSv4 errors into userland */
 142 static int nfs4_map_errors(int err)
 143 {
 144         if (err >= -1000)
 145                 return err;
 146         switch (err) {
 147         case -NFS4ERR_RESOURCE:
 148         case -NFS4ERR_LAYOUTTRYLATER:
 149         case -NFS4ERR_RECALLCONFLICT:
 150                 return -EREMOTEIO;
 151         case -NFS4ERR_WRONGSEC:
 152         case -NFS4ERR_WRONG_CRED:
 153                 return -EPERM;
 154         case -NFS4ERR_BADOWNER:
 155         case -NFS4ERR_BADNAME:
 156                 return -EINVAL;
 157         case -NFS4ERR_SHARE_DENIED:
 158                 return -EACCES;
 159         case -NFS4ERR_MINOR_VERS_MISMATCH:
 160                 return -EPROTONOSUPPORT;
 161         case -NFS4ERR_FILE_OPEN:
 162                 return -EBUSY;
 163         default:
 164                 dprintk("%s could not handle NFSv4 error %d\n",
 165                                 __func__, -err);
 166                 break;
 167         }
 168         return -EIO;
 169 }
 170
 171 /*
 172  * This is our standard bitmap for GETATTR requests.
 173  */
 174 const u32 nfs4_fattr_bitmap[3] = {
 175         FATTR4_WORD0_TYPE
 176         | FATTR4_WORD0_CHANGE
 177         | FATTR4_WORD0_SIZE
 178         | FATTR4_WORD0_FSID
 179         | FATTR4_WORD0_FILEID,
 180         FATTR4_WORD1_MODE
 181         | FATTR4_WORD1_NUMLINKS
 182         | FATTR4_WORD1_OWNER
 183         | FATTR4_WORD1_OWNER_GROUP
 184         | FATTR4_WORD1_RAWDEV
 185         | FATTR4_WORD1_SPACE_USED
 186         | FATTR4_WORD1_TIME_ACCESS
 187         | FATTR4_WORD1_TIME_METADATA
 188         | FATTR4_WORD1_TIME_MODIFY
 189         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 190 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 191         FATTR4_WORD2_SECURITY_LABEL
 192 #endif
 193 };
 194
 195 static const u32 nfs4_pnfs_open_bitmap[3] = {
 196         FATTR4_WORD0_TYPE
 197         | FATTR4_WORD0_CHANGE
 198         | FATTR4_WORD0_SIZE
 199         | FATTR4_WORD0_FSID
 200         | FATTR4_WORD0_FILEID,
 201         FATTR4_WORD1_MODE
 202         | FATTR4_WORD1_NUMLINKS
 203         | FATTR4_WORD1_OWNER
 204         | FATTR4_WORD1_OWNER_GROUP
 205         | FATTR4_WORD1_RAWDEV
 206         | FATTR4_WORD1_SPACE_USED
 207         | FATTR4_WORD1_TIME_ACCESS
 208         | FATTR4_WORD1_TIME_METADATA
 209         | FATTR4_WORD1_TIME_MODIFY,
 210         FATTR4_WORD2_MDSTHRESHOLD
 211 };
 212
 213 static const u32 nfs4_open_noattr_bitmap[3] = {
 214         FATTR4_WORD0_TYPE
 215         | FATTR4_WORD0_CHANGE
 216         | FATTR4_WORD0_FILEID,
 217 };
 218
 219 const u32 nfs4_statfs_bitmap[3] = {
 220         FATTR4_WORD0_FILES_AVAIL
 221         | FATTR4_WORD0_FILES_FREE
 222         | FATTR4_WORD0_FILES_TOTAL,
 223         FATTR4_WORD1_SPACE_AVAIL
 224         | FATTR4_WORD1_SPACE_FREE
 225         | FATTR4_WORD1_SPACE_TOTAL
 226 };
 227
 228 const u32 nfs4_pathconf_bitmap[3] = {
 229         FATTR4_WORD0_MAXLINK
 230         | FATTR4_WORD0_MAXNAME,
 231         0
 232 };
 233
 234 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 235                         | FATTR4_WORD0_MAXREAD
 236                         | FATTR4_WORD0_MAXWRITE
 237                         | FATTR4_WORD0_LEASE_TIME,
 238                         FATTR4_WORD1_TIME_DELTA
 239                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 240                         FATTR4_WORD2_LAYOUT_BLKSIZE
 241                         | FATTR4_WORD2_CLONE_BLKSIZE
 242 };
 243
 244 const u32 nfs4_fs_locations_bitmap[3] = {
 245         FATTR4_WORD0_TYPE
 246         | FATTR4_WORD0_CHANGE
 247         | FATTR4_WORD0_SIZE
 248         | FATTR4_WORD0_FSID
 249         | FATTR4_WORD0_FILEID
 250         | FATTR4_WORD0_FS_LOCATIONS,
 251         FATTR4_WORD1_MODE
 252         | FATTR4_WORD1_NUMLINKS
 253         | FATTR4_WORD1_OWNER
 254         | FATTR4_WORD1_OWNER_GROUP
 255         | FATTR4_WORD1_RAWDEV
 256         | FATTR4_WORD1_SPACE_USED
 257         | FATTR4_WORD1_TIME_ACCESS
 258         | FATTR4_WORD1_TIME_METADATA
 259         | FATTR4_WORD1_TIME_MODIFY
 260         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 261 };
 262
 263 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 264                 struct nfs4_readdir_arg *readdir)
 265 {
 266         __be32 *start, *p;
 267
 268         if (cookie > 2) {
 269                 readdir->cookie = cookie;
 270                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 271                 return;
 272         }
 273
 274         readdir->cookie = 0;
 275         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 276         if (cookie == 2)
 277                 return;
 278
 279         /*
 280          * NFSv4 servers do not return entries for '.' and '..'
 281          * Therefore, we fake these entries here.  We let '.'
 282          * have cookie 0 and '..' have cookie 1.  Note that
 283          * when talking to the server, we always send cookie 0
 284          * instead of 1 or 2.
 285          */
 286         start = p = kmap_atomic(*readdir->pages);
 287
 288         if (cookie == 0) {
 289                 *p++ = xdr_one;                                  /* next */
 290                 *p++ = xdr_zero;                   /* cookie, first word */
 291                 *p++ = xdr_one;                   /* cookie, second word */
 292                 *p++ = xdr_one;                             /* entry len */
 293                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 294                 p++;
 295                 *p++ = xdr_one;                         /* bitmap length */
 296                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 297                 *p++ = htonl(8);              /* attribute buffer length */
 298                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 299         }
 300
 301         *p++ = xdr_one;                                  /* next */
 302         *p++ = xdr_zero;                   /* cookie, first word */
 303         *p++ = xdr_two;                   /* cookie, second word */
 304         *p++ = xdr_two;                             /* entry len */
 305         memcpy(p, "..\0\0", 4);                         /* entry */
 306         p++;
 307         *p++ = xdr_one;                         /* bitmap length */
 308         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 309         *p++ = htonl(8);              /* attribute buffer length */
 310         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 311
 312         readdir->pgbase = (char *)p - (char *)start;
 313         readdir->count -= readdir->pgbase;
 314         kunmap_atomic(start);
 315 }
 316
 317 static long nfs4_update_delay(long *timeout)
 318 {
 319         long ret;
 320         if (!timeout)
 321                 return NFS4_POLL_RETRY_MAX;
 322         if (*timeout <= 0)
 323                 *timeout = NFS4_POLL_RETRY_MIN;
 324         if (*timeout > NFS4_POLL_RETRY_MAX)
 325                 *timeout = NFS4_POLL_RETRY_MAX;
 326         ret = *timeout;
 327         *timeout <<= 1;
 328         return ret;
 329 }
 330
 331 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 332 {
 333         int res = 0;
 334
 335         might_sleep();
 336
 337         freezable_schedule_timeout_killable_unsafe(
 338                 nfs4_update_delay(timeout));
 339         if (fatal_signal_pending(current))
 340                 res = -ERESTARTSYS;
 341         return res;
 342 }
 343
 344 /* This is the error handling routine for processes that are allowed
 345  * to sleep.
 346  */
 347 static int nfs4_do_handle_exception(struct nfs_server *server,
 348                 int errorcode, struct nfs4_exception *exception)
 349 {
 350         struct nfs_client *clp = server->nfs_client;
 351         struct nfs4_state *state = exception->state;
 352         struct inode *inode = exception->inode;
 353         int ret = errorcode;
 354
 355         exception->delay = 0;
 356         exception->recovering = 0;
 357         exception->retry = 0;
 358         switch(errorcode) {
 359                 case 0:
 360                         return 0;
 361                 case -NFS4ERR_OPENMODE:
 362                 case -NFS4ERR_DELEG_REVOKED:
 363                 case -NFS4ERR_ADMIN_REVOKED:
 364                 case -NFS4ERR_BAD_STATEID:
 365                         if (inode && nfs_async_inode_return_delegation(inode,
 366                                                 NULL) == 0)
 367                                 goto wait_on_recovery;
 368                         if (state == NULL)
 369                                 break;
 370                         ret = nfs4_schedule_stateid_recovery(server, state);
 371                         if (ret < 0)
 372                                 break;
 373                         goto wait_on_recovery;
 374                 case -NFS4ERR_EXPIRED:
 375                         if (state != NULL) {
 376                                 ret = nfs4_schedule_stateid_recovery(server, state);
 377                                 if (ret < 0)
 378                                         break;
 379                         }
 380                 case -NFS4ERR_STALE_STATEID:
 381                 case -NFS4ERR_STALE_CLIENTID:
 382                         nfs4_schedule_lease_recovery(clp);
 383                         goto wait_on_recovery;
 384                 case -NFS4ERR_MOVED:
 385                         ret = nfs4_schedule_migration_recovery(server);
 386                         if (ret < 0)
 387                                 break;
 388                         goto wait_on_recovery;
 389                 case -NFS4ERR_LEASE_MOVED:
 390                         nfs4_schedule_lease_moved_recovery(clp);
 391                         goto wait_on_recovery;
 392 #if defined(CONFIG_NFS_V4_1)
 393                 case -NFS4ERR_BADSESSION:
 394                 case -NFS4ERR_BADSLOT:
 395                 case -NFS4ERR_BAD_HIGH_SLOT:
 396                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 397                 case -NFS4ERR_DEADSESSION:
 398                 case -NFS4ERR_SEQ_FALSE_RETRY:
 399                 case -NFS4ERR_SEQ_MISORDERED:
 400                         dprintk("%s ERROR: %d Reset session\n", __func__,
 401                                 errorcode);
 402                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 403                         goto wait_on_recovery;
 404 #endif /* defined(CONFIG_NFS_V4_1) */
 405                 case -NFS4ERR_FILE_OPEN:
 406                         if (exception->timeout > HZ) {
 407                                 /* We have retried a decent amount, time to
 408                                  * fail
 409                                  */
 410                                 ret = -EBUSY;
 411                                 break;
 412                         }
 413                 case -NFS4ERR_DELAY:
 414                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 415                 case -NFS4ERR_GRACE:
 416                         exception->delay = 1;
 417                         return 0;
 418
 419                 case -NFS4ERR_RETRY_UNCACHED_REP:
 420                 case -NFS4ERR_OLD_STATEID:
 421                         exception->retry = 1;
 422                         break;
 423                 case -NFS4ERR_BADOWNER:
 424                         /* The following works around a Linux server bug! */
 425                 case -NFS4ERR_BADNAME:
 426                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 427                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 428                                 exception->retry = 1;
 429                                 printk(KERN_WARNING "NFS: v4 server %s "
 430                                                 "does not accept raw "
 431                                                 "uid/gids. "
 432                                                 "Reenabling the idmapper.\n",
 433                                                 server->nfs_client->cl_hostname);
 434                         }
 435         }
 436         /* We failed to handle the error */
 437         return nfs4_map_errors(ret);
 438 wait_on_recovery:
 439         exception->recovering = 1;
 440         return 0;
 441 }
 442
 443 /* This is the error handling routine for processes that are allowed
 444  * to sleep.
 445  */
 446 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 447 {
 448         struct nfs_client *clp = server->nfs_client;
 449         int ret;
 450
 451         ret = nfs4_do_handle_exception(server, errorcode, exception);
 452         if (exception->delay) {
 453                 ret = nfs4_delay(server->client, &exception->timeout);
 454                 goto out_retry;
 455         }
 456         if (exception->recovering) {
 457                 ret = nfs4_wait_clnt_recover(clp);
 458                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 459                         return -EIO;
 460                 goto out_retry;
 461         }
 462         return ret;
 463 out_retry:
 464         if (ret == 0)
 465                 exception->retry = 1;
 466         return ret;
 467 }
 468
 469 static int
 470 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 471                 int errorcode, struct nfs4_exception *exception)
 472 {
 473         struct nfs_client *clp = server->nfs_client;
 474         int ret;
 475
 476         ret = nfs4_do_handle_exception(server, errorcode, exception);
 477         if (exception->delay) {
 478                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 479                 goto out_retry;
 480         }
 481         if (exception->recovering) {
 482                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 483                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 484                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 485                 goto out_retry;
 486         }
 487         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 488                 ret = -EIO;
 489         return ret;
 490 out_retry:
 491         if (ret == 0)
 492                 exception->retry = 1;
 493         return ret;
 494 }
 495
 496 static int
 497 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 498                         struct nfs4_state *state, long *timeout)
 499 {
 500         struct nfs4_exception exception = {
 501                 .state = state,
 502         };
 503
 504         if (task->tk_status >= 0)
 505                 return 0;
 506         if (timeout)
 507                 exception.timeout = *timeout;
 508         task->tk_status = nfs4_async_handle_exception(task, server,
 509                         task->tk_status,
 510                         &exception);
 511         if (exception.delay && timeout)
 512                 *timeout = exception.timeout;
 513         if (exception.retry)
 514                 return -EAGAIN;
 515         return 0;
 516 }
 517
 518 /*
 519  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 520  * or 'false' otherwise.
 521  */
 522 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 523 {
 524         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 525
 526         if (flavor == RPC_AUTH_GSS_KRB5I ||
 527             flavor == RPC_AUTH_GSS_KRB5P)
 528                 return true;
 529
 530         return false;
 531 }
 532
 533 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 534 {
 535         spin_lock(&clp->cl_lock);
 536         if (time_before(clp->cl_last_renewal,timestamp))
 537                 clp->cl_last_renewal = timestamp;
 538         spin_unlock(&clp->cl_lock);
 539 }
 540
 541 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 542 {
 543         struct nfs_client *clp = server->nfs_client;
 544
 545         if (!nfs4_has_session(clp))
 546                 do_renew_lease(clp, timestamp);
 547 }
 548
 549 struct nfs4_call_sync_data {
 550         const struct nfs_server *seq_server;
 551         struct nfs4_sequence_args *seq_args;
 552         struct nfs4_sequence_res *seq_res;
 553 };
 554
 555 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 556                         struct nfs4_sequence_res *res, int cache_reply)
 557 {
 558         args->sa_slot = NULL;
 559         args->sa_cache_this = cache_reply;
 560         args->sa_privileged = 0;
 561
 562         res->sr_slot = NULL;
 563 }
 564
 565 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 566 {
 567         args->sa_privileged = 1;
 568 }
 569
 570 int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 571                          struct nfs4_sequence_args *args,
 572                          struct nfs4_sequence_res *res,
 573                          struct rpc_task *task)
 574 {
 575         struct nfs4_slot *slot;
 576
 577         /* slot already allocated? */
 578         if (res->sr_slot != NULL)
 579                 goto out_start;
 580
 581         spin_lock(&tbl->slot_tbl_lock);
 582         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 583                 goto out_sleep;
 584
 585         slot = nfs4_alloc_slot(tbl);
 586         if (IS_ERR(slot)) {
 587                 if (slot == ERR_PTR(-ENOMEM))
 588                         task->tk_timeout = HZ >> 2;
 589                 goto out_sleep;
 590         }
 591         spin_unlock(&tbl->slot_tbl_lock);
 592
 593         args->sa_slot = slot;
 594         res->sr_slot = slot;
 595
 596 out_start:
 597         rpc_call_start(task);
 598         return 0;
 599
 600 out_sleep:
 601         if (args->sa_privileged)
 602                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 603                                 NULL, RPC_PRIORITY_PRIVILEGED);
 604         else
 605                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 606         spin_unlock(&tbl->slot_tbl_lock);
 607         return -EAGAIN;
 608 }
 609 EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
 610
 611 static int nfs40_sequence_done(struct rpc_task *task,
 612                                struct nfs4_sequence_res *res)
 613 {
 614         struct nfs4_slot *slot = res->sr_slot;
 615         struct nfs4_slot_table *tbl;
 616
 617         if (slot == NULL)
 618                 goto out;
 619
 620         tbl = slot->table;
 621         spin_lock(&tbl->slot_tbl_lock);
 622         if (!nfs41_wake_and_assign_slot(tbl, slot))
 623                 nfs4_free_slot(tbl, slot);
 624         spin_unlock(&tbl->slot_tbl_lock);
 625
 626         res->sr_slot = NULL;
 627 out:
 628         return 1;
 629 }
 630
 631 #if defined(CONFIG_NFS_V4_1)
 632
 633 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 634 {
 635         struct nfs4_session *session;
 636         struct nfs4_slot_table *tbl;
 637         struct nfs4_slot *slot = res->sr_slot;
 638         bool send_new_highest_used_slotid = false;
 639
 640         tbl = slot->table;
 641         session = tbl->session;
 642
 643         spin_lock(&tbl->slot_tbl_lock);
 644         /* Be nice to the server: try to ensure that the last transmitted
 645          * value for highest_user_slotid <= target_highest_slotid
 646          */
 647         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 648                 send_new_highest_used_slotid = true;
 649
 650         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 651                 send_new_highest_used_slotid = false;
 652                 goto out_unlock;
 653         }
 654         nfs4_free_slot(tbl, slot);
 655
 656         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 657                 send_new_highest_used_slotid = false;
 658 out_unlock:
 659         spin_unlock(&tbl->slot_tbl_lock);
 660         res->sr_slot = NULL;
 661         if (send_new_highest_used_slotid)
 662                 nfs41_notify_server(session->clp);
 663 }
 664
 665 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 666 {
 667         struct nfs4_session *session;
 668         struct nfs4_slot *slot = res->sr_slot;
 669         struct nfs_client *clp;
 670         bool interrupted = false;
 671         int ret = 1;
 672
 673         if (slot == NULL)
 674                 goto out_noaction;
 675         /* don't increment the sequence number if the task wasn't sent */
 676         if (!RPC_WAS_SENT(task))
 677                 goto out;
 678
 679         session = slot->table->session;
 680
 681         if (slot->interrupted) {
 682                 slot->interrupted = 0;
 683                 interrupted = true;
 684         }
 685
 686         trace_nfs4_sequence_done(session, res);
 687         /* Check the SEQUENCE operation status */
 688         switch (res->sr_status) {
 689         case 0:
 690                 /* Update the slot's sequence and clientid lease timer */
 691                 ++slot->seq_nr;
 692                 clp = session->clp;
 693                 do_renew_lease(clp, res->sr_timestamp);
 694                 /* Check sequence flags */
 695                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 696                 nfs41_update_target_slotid(slot->table, slot, res);
 697                 break;
 698         case 1:
 699                 /*
 700                  * sr_status remains 1 if an RPC level error occurred.
 701                  * The server may or may not have processed the sequence
 702                  * operation..
 703                  * Mark the slot as having hosted an interrupted RPC call.
 704                  */
 705                 slot->interrupted = 1;
 706                 goto out;
 707         case -NFS4ERR_DELAY:
 708                 /* The server detected a resend of the RPC call and
 709                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 710                  * of RFC5661.
 711                  */
 712                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 713                         __func__,
 714                         slot->slot_nr,
 715                         slot->seq_nr);
 716                 goto out_retry;
 717         case -NFS4ERR_BADSLOT:
 718                 /*
 719                  * The slot id we used was probably retired. Try again
 720                  * using a different slot id.
 721                  */
 722                 goto retry_nowait;
 723         case -NFS4ERR_SEQ_MISORDERED:
 724                 /*
 725                  * Was the last operation on this sequence interrupted?
 726                  * If so, retry after bumping the sequence number.
 727                  */
 728                 if (interrupted) {
 729                         ++slot->seq_nr;
 730                         goto retry_nowait;
 731                 }
 732                 /*
 733                  * Could this slot have been previously retired?
 734                  * If so, then the server may be expecting seq_nr = 1!
 735                  */
 736                 if (slot->seq_nr != 1) {
 737                         slot->seq_nr = 1;
 738                         goto retry_nowait;
 739                 }
 740                 break;
 741         case -NFS4ERR_SEQ_FALSE_RETRY:
 742                 ++slot->seq_nr;
 743                 goto retry_nowait;
 744         default:
 745                 /* Just update the slot sequence no. */
 746                 ++slot->seq_nr;
 747         }
 748 out:
 749         /* The session may be reset by one of the error handlers. */
 750         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 751         nfs41_sequence_free_slot(res);
 752 out_noaction:
 753         return ret;
 754 retry_nowait:
 755         if (rpc_restart_call_prepare(task)) {
 756                 task->tk_status = 0;
 757                 ret = 0;
 758         }
 759         goto out;
 760 out_retry:
 761         if (!rpc_restart_call(task))
 762                 goto out;
 763         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 764         return 0;
 765 }
 766 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 767
 768 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 769 {
 770         if (res->sr_slot == NULL)
 771                 return 1;
 772         if (!res->sr_slot->table->session)
 773                 return nfs40_sequence_done(task, res);
 774         return nfs41_sequence_done(task, res);
 775 }
 776 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 777
 778 int nfs41_setup_sequence(struct nfs4_session *session,
 779                                 struct nfs4_sequence_args *args,
 780                                 struct nfs4_sequence_res *res,
 781                                 struct rpc_task *task)
 782 {
 783         struct nfs4_slot *slot;
 784         struct nfs4_slot_table *tbl;
 785
 786         dprintk("--> %s\n", __func__);
 787         /* slot already allocated? */
 788         if (res->sr_slot != NULL)
 789                 goto out_success;
 790
 791         tbl = &session->fc_slot_table;
 792
 793         task->tk_timeout = 0;
 794
 795         spin_lock(&tbl->slot_tbl_lock);
 796         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 797             !args->sa_privileged) {
 798                 /* The state manager will wait until the slot table is empty */
 799                 dprintk("%s session is draining\n", __func__);
 800                 goto out_sleep;
 801         }
 802
 803         slot = nfs4_alloc_slot(tbl);
 804         if (IS_ERR(slot)) {
 805                 /* If out of memory, try again in 1/4 second */
 806                 if (slot == ERR_PTR(-ENOMEM))
 807                         task->tk_timeout = HZ >> 2;
 808                 dprintk("<-- %s: no free slots\n", __func__);
 809                 goto out_sleep;
 810         }
 811         spin_unlock(&tbl->slot_tbl_lock);
 812
 813         args->sa_slot = slot;
 814
 815         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 816                         slot->slot_nr, slot->seq_nr);
 817
 818         res->sr_slot = slot;
 819         res->sr_timestamp = jiffies;
 820         res->sr_status_flags = 0;
 821         /*
 822          * sr_status is only set in decode_sequence, and so will remain
 823          * set to 1 if an rpc level failure occurs.
 824          */
 825         res->sr_status = 1;
 826         trace_nfs4_setup_sequence(session, args);
 827 out_success:
 828         rpc_call_start(task);
 829         return 0;
 830 out_sleep:
 831         /* Privileged tasks are queued with top priority */
 832         if (args->sa_privileged)
 833                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 834                                 NULL, RPC_PRIORITY_PRIVILEGED);
 835         else
 836                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 837         spin_unlock(&tbl->slot_tbl_lock);
 838         return -EAGAIN;
 839 }
 840 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 841
 842 static int nfs4_setup_sequence(const struct nfs_server *server,
 843                                struct nfs4_sequence_args *args,
 844                                struct nfs4_sequence_res *res,
 845                                struct rpc_task *task)
 846 {
 847         struct nfs4_session *session = nfs4_get_session(server);
 848         int ret = 0;
 849
 850         if (!session)
 851                 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 852                                             args, res, task);
 853
 854         dprintk("--> %s clp %p session %p sr_slot %u\n",
 855                 __func__, session->clp, session, res->sr_slot ?
 856                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 857
 858         ret = nfs41_setup_sequence(session, args, res, task);
 859
 860         dprintk("<-- %s status=%d\n", __func__, ret);
 861         return ret;
 862 }
 863
 864 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 865 {
 866         struct nfs4_call_sync_data *data = calldata;
 867         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 868
 869         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 870
 871         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 872 }
 873
 874 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 875 {
 876         struct nfs4_call_sync_data *data = calldata;
 877
 878         nfs41_sequence_done(task, data->seq_res);
 879 }
 880
 881 static const struct rpc_call_ops nfs41_call_sync_ops = {
 882         .rpc_call_prepare = nfs41_call_sync_prepare,
 883         .rpc_call_done = nfs41_call_sync_done,
 884 };
 885
 886 #else   /* !CONFIG_NFS_V4_1 */
 887
 888 static int nfs4_setup_sequence(const struct nfs_server *server,
 889                                struct nfs4_sequence_args *args,
 890                                struct nfs4_sequence_res *res,
 891                                struct rpc_task *task)
 892 {
 893         return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 894                                     args, res, task);
 895 }
 896
 897 int nfs4_sequence_done(struct rpc_task *task,
 898                        struct nfs4_sequence_res *res)
 899 {
 900         return nfs40_sequence_done(task, res);
 901 }
 902 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 903
 904 #endif  /* !CONFIG_NFS_V4_1 */
 905
 906 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 907 {
 908         struct nfs4_call_sync_data *data = calldata;
 909         nfs4_setup_sequence(data->seq_server,
 910                                 data->seq_args, data->seq_res, task);
 911 }
 912
 913 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 914 {
 915         struct nfs4_call_sync_data *data = calldata;
 916         nfs4_sequence_done(task, data->seq_res);
 917 }
 918
 919 static const struct rpc_call_ops nfs40_call_sync_ops = {
 920         .rpc_call_prepare = nfs40_call_sync_prepare,
 921         .rpc_call_done = nfs40_call_sync_done,
 922 };
 923
 924 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 925                                    struct nfs_server *server,
 926                                    struct rpc_message *msg,
 927                                    struct nfs4_sequence_args *args,
 928                                    struct nfs4_sequence_res *res)
 929 {
 930         int ret;
 931         struct rpc_task *task;
 932         struct nfs_client *clp = server->nfs_client;
 933         struct nfs4_call_sync_data data = {
 934                 .seq_server = server,
 935                 .seq_args = args,
 936                 .seq_res = res,
 937         };
 938         struct rpc_task_setup task_setup = {
 939                 .rpc_client = clnt,
 940                 .rpc_message = msg,
 941                 .callback_ops = clp->cl_mvops->call_sync_ops,
 942                 .callback_data = &data
 943         };
 944
 945         task = rpc_run_task(&task_setup);
 946         if (IS_ERR(task))
 947                 ret = PTR_ERR(task);
 948         else {
 949                 ret = task->tk_status;
 950                 rpc_put_task(task);
 951         }
 952         return ret;
 953 }
 954
 955 int nfs4_call_sync(struct rpc_clnt *clnt,
 956                    struct nfs_server *server,
 957                    struct rpc_message *msg,
 958                    struct nfs4_sequence_args *args,
 959                    struct nfs4_sequence_res *res,
 960                    int cache_reply)
 961 {
 962         nfs4_init_sequence(args, res, cache_reply);
 963         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 964 }
 965
 966 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 967 {
 968         struct nfs_inode *nfsi = NFS_I(dir);
 969
 970         spin_lock(&dir->i_lock);
 971         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 972         if (!cinfo->atomic || cinfo->before != dir->i_version)
 973                 nfs_force_lookup_revalidate(dir);
 974         dir->i_version = cinfo->after;
 975         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
 976         nfs_fscache_invalidate(dir);
 977         spin_unlock(&dir->i_lock);
 978 }
 979
 980 struct nfs4_opendata {
 981         struct kref kref;
 982         struct nfs_openargs o_arg;
 983         struct nfs_openres o_res;
 984         struct nfs_open_confirmargs c_arg;
 985         struct nfs_open_confirmres c_res;
 986         struct nfs4_string owner_name;
 987         struct nfs4_string group_name;
 988         struct nfs4_label *a_label;
 989         struct nfs_fattr f_attr;
 990         struct nfs4_label *f_label;
 991         struct dentry *dir;
 992         struct dentry *dentry;
 993         struct nfs4_state_owner *owner;
 994         struct nfs4_state *state;
 995         struct iattr attrs;
 996         unsigned long timestamp;
 997         unsigned int rpc_done : 1;
 998         unsigned int file_created : 1;
 999         unsigned int is_recover : 1;
1000         int rpc_status;
1001         int cancelled;
1002 };
1003
1004 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1005                 int err, struct nfs4_exception *exception)
1006 {
1007         if (err != -EINVAL)
1008                 return false;
1009         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1010                 return false;
1011         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1012         exception->retry = 1;
1013         return true;
1014 }
1015
1016 static u32
1017 nfs4_map_atomic_open_share(struct nfs_server *server,
1018                 fmode_t fmode, int openflags)
1019 {
1020         u32 res = 0;
1021
1022         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1023         case FMODE_READ:
1024                 res = NFS4_SHARE_ACCESS_READ;
1025                 break;
1026         case FMODE_WRITE:
1027                 res = NFS4_SHARE_ACCESS_WRITE;
1028                 break;
1029         case FMODE_READ|FMODE_WRITE:
1030                 res = NFS4_SHARE_ACCESS_BOTH;
1031         }
1032         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1033                 goto out;
1034         /* Want no delegation if we're using O_DIRECT */
1035         if (openflags & O_DIRECT)
1036                 res |= NFS4_SHARE_WANT_NO_DELEG;
1037 out:
1038         return res;
1039 }
1040
1041 static enum open_claim_type4
1042 nfs4_map_atomic_open_claim(struct nfs_server *server,
1043                 enum open_claim_type4 claim)
1044 {
1045         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1046                 return claim;
1047         switch (claim) {
1048         default:
1049                 return claim;
1050         case NFS4_OPEN_CLAIM_FH:
1051                 return NFS4_OPEN_CLAIM_NULL;
1052         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1053                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1054         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1055                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1056         }
1057 }
1058
1059 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1060 {
1061         p->o_res.f_attr = &p->f_attr;
1062         p->o_res.f_label = p->f_label;
1063         p->o_res.seqid = p->o_arg.seqid;
1064         p->c_res.seqid = p->c_arg.seqid;
1065         p->o_res.server = p->o_arg.server;
1066         p->o_res.access_request = p->o_arg.access;
1067         nfs_fattr_init(&p->f_attr);
1068         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1069 }
1070
1071 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1072                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1073                 const struct iattr *attrs,
1074                 struct nfs4_label *label,
1075                 enum open_claim_type4 claim,
1076                 gfp_t gfp_mask)
1077 {
1078         struct dentry *parent = dget_parent(dentry);
1079         struct inode *dir = d_inode(parent);
1080         struct nfs_server *server = NFS_SERVER(dir);
1081         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1082         struct nfs4_opendata *p;
1083
1084         p = kzalloc(sizeof(*p), gfp_mask);
1085         if (p == NULL)
1086                 goto err;
1087
1088         p->f_label = nfs4_label_alloc(server, gfp_mask);
1089         if (IS_ERR(p->f_label))
1090                 goto err_free_p;
1091
1092         p->a_label = nfs4_label_alloc(server, gfp_mask);
1093         if (IS_ERR(p->a_label))
1094                 goto err_free_f;
1095
1096         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1097         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1098         if (IS_ERR(p->o_arg.seqid))
1099                 goto err_free_label;
1100         nfs_sb_active(dentry->d_sb);
1101         p->dentry = dget(dentry);
1102         p->dir = parent;
1103         p->owner = sp;
1104         atomic_inc(&sp->so_count);
1105         p->o_arg.open_flags = flags;
1106         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1107         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1108                         fmode, flags);
1109         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1110          * will return permission denied for all bits until close */
1111         if (!(flags & O_EXCL)) {
1112                 /* ask server to check for all possible rights as results
1113                  * are cached */
1114                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1115                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1116         }
1117         p->o_arg.clientid = server->nfs_client->cl_clientid;
1118         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1119         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1120         p->o_arg.name = &dentry->d_name;
1121         p->o_arg.server = server;
1122         p->o_arg.bitmask = nfs4_bitmask(server, label);
1123         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1124         p->o_arg.label = nfs4_label_copy(p->a_label, label);
1125         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1126         switch (p->o_arg.claim) {
1127         case NFS4_OPEN_CLAIM_NULL:
1128         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1129         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1130                 p->o_arg.fh = NFS_FH(dir);
1131                 break;
1132         case NFS4_OPEN_CLAIM_PREVIOUS:
1133         case NFS4_OPEN_CLAIM_FH:
1134         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1135         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1136                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1137         }
1138         if (attrs != NULL && attrs->ia_valid != 0) {
1139                 __u32 verf[2];
1140
1141                 p->o_arg.u.attrs = &p->attrs;
1142                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1143
1144                 verf[0] = jiffies;
1145                 verf[1] = current->pid;
1146                 memcpy(p->o_arg.u.verifier.data, verf,
1147                                 sizeof(p->o_arg.u.verifier.data));
1148         }
1149         p->c_arg.fh = &p->o_res.fh;
1150         p->c_arg.stateid = &p->o_res.stateid;
1151         p->c_arg.seqid = p->o_arg.seqid;
1152         nfs4_init_opendata_res(p);
1153         kref_init(&p->kref);
1154         return p;
1155
1156 err_free_label:
1157         nfs4_label_free(p->a_label);
1158 err_free_f:
1159         nfs4_label_free(p->f_label);
1160 err_free_p:
1161         kfree(p);
1162 err:
1163         dput(parent);
1164         return NULL;
1165 }
1166
1167 static void nfs4_opendata_free(struct kref *kref)
1168 {
1169         struct nfs4_opendata *p = container_of(kref,
1170                         struct nfs4_opendata, kref);
1171         struct super_block *sb = p->dentry->d_sb;
1172
1173         nfs_free_seqid(p->o_arg.seqid);
1174         if (p->state != NULL)
1175                 nfs4_put_open_state(p->state);
1176         nfs4_put_state_owner(p->owner);
1177
1178         nfs4_label_free(p->a_label);
1179         nfs4_label_free(p->f_label);
1180
1181         dput(p->dir);
1182         dput(p->dentry);
1183         nfs_sb_deactive(sb);
1184         nfs_fattr_free_names(&p->f_attr);
1185         kfree(p->f_attr.mdsthreshold);
1186         kfree(p);
1187 }
1188
1189 static void nfs4_opendata_put(struct nfs4_opendata *p)
1190 {
1191         if (p != NULL)
1192                 kref_put(&p->kref, nfs4_opendata_free);
1193 }
1194
1195 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1196 {
1197         int ret;
1198
1199         ret = rpc_wait_for_completion_task(task);
1200         return ret;
1201 }
1202
1203 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1204                 fmode_t fmode)
1205 {
1206         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1207         case FMODE_READ|FMODE_WRITE:
1208                 return state->n_rdwr != 0;
1209         case FMODE_WRITE:
1210                 return state->n_wronly != 0;
1211         case FMODE_READ:
1212                 return state->n_rdonly != 0;
1213         }
1214         WARN_ON_ONCE(1);
1215         return false;
1216 }
1217
1218 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1219 {
1220         int ret = 0;
1221
1222         if (open_mode & (O_EXCL|O_TRUNC))
1223                 goto out;
1224         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1225                 case FMODE_READ:
1226                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1227                                 && state->n_rdonly != 0;
1228                         break;
1229                 case FMODE_WRITE:
1230                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1231                                 && state->n_wronly != 0;
1232                         break;
1233                 case FMODE_READ|FMODE_WRITE:
1234                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1235                                 && state->n_rdwr != 0;
1236         }
1237 out:
1238         return ret;
1239 }
1240
1241 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1242                 enum open_claim_type4 claim)
1243 {
1244         if (delegation == NULL)
1245                 return 0;
1246         if ((delegation->type & fmode) != fmode)
1247                 return 0;
1248         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1249                 return 0;
1250         switch (claim) {
1251         case NFS4_OPEN_CLAIM_NULL:
1252         case NFS4_OPEN_CLAIM_FH:
1253                 break;
1254         case NFS4_OPEN_CLAIM_PREVIOUS:
1255                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1256                         break;
1257         default:
1258                 return 0;
1259         }
1260         nfs_mark_delegation_referenced(delegation);
1261         return 1;
1262 }
1263
1264 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1265 {
1266         switch (fmode) {
1267                 case FMODE_WRITE:
1268                         state->n_wronly++;
1269                         break;
1270                 case FMODE_READ:
1271                         state->n_rdonly++;
1272                         break;
1273                 case FMODE_READ|FMODE_WRITE:
1274                         state->n_rdwr++;
1275         }
1276         nfs4_state_set_mode_locked(state, state->state | fmode);
1277 }
1278
1279 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1280 {
1281         struct nfs_client *clp = state->owner->so_server->nfs_client;
1282         bool need_recover = false;
1283
1284         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1285                 need_recover = true;
1286         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1287                 need_recover = true;
1288         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1289                 need_recover = true;
1290         if (need_recover)
1291                 nfs4_state_mark_reclaim_nograce(clp, state);
1292 }
1293
1294 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1295                 nfs4_stateid *stateid)
1296 {
1297         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1298                 return true;
1299         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1300                 nfs_test_and_clear_all_open_stateid(state);
1301                 return true;
1302         }
1303         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1304                 return true;
1305         return false;
1306 }
1307
1308 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1309 {
1310         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1311                 return;
1312         if (state->n_wronly)
1313                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1314         if (state->n_rdonly)
1315                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1316         if (state->n_rdwr)
1317                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1318         set_bit(NFS_OPEN_STATE, &state->flags);
1319 }
1320
1321 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1322                 nfs4_stateid *arg_stateid,
1323                 nfs4_stateid *stateid, fmode_t fmode)
1324 {
1325         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1326         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1327         case FMODE_WRITE:
1328                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1329                 break;
1330         case FMODE_READ:
1331                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1332                 break;
1333         case 0:
1334                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1335                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1336                 clear_bit(NFS_OPEN_STATE, &state->flags);
1337         }
1338         if (stateid == NULL)
1339                 return;
1340         /* Handle races with OPEN */
1341         if (!nfs4_stateid_match_other(arg_stateid, &state->open_stateid) ||
1342             (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1343             !nfs4_stateid_is_newer(stateid, &state->open_stateid))) {
1344                 nfs_resync_open_stateid_locked(state);
1345                 return;
1346         }
1347         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1348                 nfs4_stateid_copy(&state->stateid, stateid);
1349         nfs4_stateid_copy(&state->open_stateid, stateid);
1350 }
1351
1352 static void nfs_clear_open_stateid(struct nfs4_state *state,
1353         nfs4_stateid *arg_stateid,
1354         nfs4_stateid *stateid, fmode_t fmode)
1355 {
1356         write_seqlock(&state->seqlock);
1357         nfs_clear_open_stateid_locked(state, arg_stateid, stateid, fmode);
1358         write_sequnlock(&state->seqlock);
1359         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1360                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1361 }
1362
1363 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1364 {
1365         switch (fmode) {
1366                 case FMODE_READ:
1367                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1368                         break;
1369                 case FMODE_WRITE:
1370                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1371                         break;
1372                 case FMODE_READ|FMODE_WRITE:
1373                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1374         }
1375         if (!nfs_need_update_open_stateid(state, stateid))
1376                 return;
1377         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1378                 nfs4_stateid_copy(&state->stateid, stateid);
1379         nfs4_stateid_copy(&state->open_stateid, stateid);
1380 }
1381
1382 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1383 {
1384         /*
1385          * Protect the call to nfs4_state_set_mode_locked and
1386          * serialise the stateid update
1387          */
1388         write_seqlock(&state->seqlock);
1389         if (deleg_stateid != NULL) {
1390                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1391                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1392         }
1393         if (open_stateid != NULL)
1394                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1395         write_sequnlock(&state->seqlock);
1396         spin_lock(&state->owner->so_lock);
1397         update_open_stateflags(state, fmode);
1398         spin_unlock(&state->owner->so_lock);
1399 }
1400
1401 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1402 {
1403         struct nfs_inode *nfsi = NFS_I(state->inode);
1404         struct nfs_delegation *deleg_cur;
1405         int ret = 0;
1406
1407         fmode &= (FMODE_READ|FMODE_WRITE);
1408
1409         rcu_read_lock();
1410         deleg_cur = rcu_dereference(nfsi->delegation);
1411         if (deleg_cur == NULL)
1412                 goto no_delegation;
1413
1414         spin_lock(&deleg_cur->lock);
1415         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1416            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1417             (deleg_cur->type & fmode) != fmode)
1418                 goto no_delegation_unlock;
1419
1420         if (delegation == NULL)
1421                 delegation = &deleg_cur->stateid;
1422         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1423                 goto no_delegation_unlock;
1424
1425         nfs_mark_delegation_referenced(deleg_cur);
1426         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1427         ret = 1;
1428 no_delegation_unlock:
1429         spin_unlock(&deleg_cur->lock);
1430 no_delegation:
1431         rcu_read_unlock();
1432
1433         if (!ret && open_stateid != NULL) {
1434                 __update_open_stateid(state, open_stateid, NULL, fmode);
1435                 ret = 1;
1436         }
1437         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1438                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1439
1440         return ret;
1441 }
1442
1443 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1444                 const nfs4_stateid *stateid)
1445 {
1446         struct nfs4_state *state = lsp->ls_state;
1447         bool ret = false;
1448
1449         spin_lock(&state->state_lock);
1450         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1451                 goto out_noupdate;
1452         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1453                 goto out_noupdate;
1454         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1455         ret = true;
1456 out_noupdate:
1457         spin_unlock(&state->state_lock);
1458         return ret;
1459 }
1460
1461 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1462 {
1463         struct nfs_delegation *delegation;
1464
1465         rcu_read_lock();
1466         delegation = rcu_dereference(NFS_I(inode)->delegation);
1467         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1468                 rcu_read_unlock();
1469                 return;
1470         }
1471         rcu_read_unlock();
1472         nfs4_inode_return_delegation(inode);
1473 }
1474
1475 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1476 {
1477         struct nfs4_state *state = opendata->state;
1478         struct nfs_inode *nfsi = NFS_I(state->inode);
1479         struct nfs_delegation *delegation;
1480         int open_mode = opendata->o_arg.open_flags;
1481         fmode_t fmode = opendata->o_arg.fmode;
1482         enum open_claim_type4 claim = opendata->o_arg.claim;
1483         nfs4_stateid stateid;
1484         int ret = -EAGAIN;
1485
1486         for (;;) {
1487                 spin_lock(&state->owner->so_lock);
1488                 if (can_open_cached(state, fmode, open_mode)) {
1489                         update_open_stateflags(state, fmode);
1490                         spin_unlock(&state->owner->so_lock);
1491                         goto out_return_state;
1492                 }
1493                 spin_unlock(&state->owner->so_lock);
1494                 rcu_read_lock();
1495                 delegation = rcu_dereference(nfsi->delegation);
1496                 if (!can_open_delegated(delegation, fmode, claim)) {
1497                         rcu_read_unlock();
1498                         break;
1499                 }
1500                 /* Save the delegation */
1501                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1502                 rcu_read_unlock();
1503                 nfs_release_seqid(opendata->o_arg.seqid);
1504                 if (!opendata->is_recover) {
1505                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1506                         if (ret != 0)
1507                                 goto out;
1508                 }
1509                 ret = -EAGAIN;
1510
1511                 /* Try to update the stateid using the delegation */
1512                 if (update_open_stateid(state, NULL, &stateid, fmode))
1513                         goto out_return_state;
1514         }
1515 out:
1516         return ERR_PTR(ret);
1517 out_return_state:
1518         atomic_inc(&state->count);
1519         return state;
1520 }
1521
1522 static void
1523 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1524 {
1525         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1526         struct nfs_delegation *delegation;
1527         int delegation_flags = 0;
1528
1529         rcu_read_lock();
1530         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1531         if (delegation)
1532                 delegation_flags = delegation->flags;
1533         rcu_read_unlock();
1534         switch (data->o_arg.claim) {
1535         default:
1536                 break;
1537         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1538         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1539                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1540                                    "returning a delegation for "
1541                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1542                                    clp->cl_hostname);
1543                 return;
1544         }
1545         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1546                 nfs_inode_set_delegation(state->inode,
1547                                          data->owner->so_cred,
1548                                          &data->o_res);
1549         else
1550                 nfs_inode_reclaim_delegation(state->inode,
1551                                              data->owner->so_cred,
1552                                              &data->o_res);
1553 }
1554
1555 /*
1556  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1557  * and update the nfs4_state.
1558  */
1559 static struct nfs4_state *
1560 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1561 {
1562         struct inode *inode = data->state->inode;
1563         struct nfs4_state *state = data->state;
1564         int ret;
1565
1566         if (!data->rpc_done) {
1567                 if (data->rpc_status) {
1568                         ret = data->rpc_status;
1569                         goto err;
1570                 }
1571                 /* cached opens have already been processed */
1572                 goto update;
1573         }
1574
1575         ret = nfs_refresh_inode(inode, &data->f_attr);
1576         if (ret)
1577                 goto err;
1578
1579         if (data->o_res.delegation_type != 0)
1580                 nfs4_opendata_check_deleg(data, state);
1581 update:
1582         update_open_stateid(state, &data->o_res.stateid, NULL,
1583                             data->o_arg.fmode);
1584         atomic_inc(&state->count);
1585
1586         return state;
1587 err:
1588         return ERR_PTR(ret);
1589
1590 }
1591
1592 static struct nfs4_state *
1593 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1594 {
1595         struct inode *inode;
1596         struct nfs4_state *state = NULL;
1597         int ret;
1598
1599         if (!data->rpc_done) {
1600                 state = nfs4_try_open_cached(data);
1601                 goto out;
1602         }
1603
1604         ret = -EAGAIN;
1605         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1606                 goto err;
1607         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1608         ret = PTR_ERR(inode);
1609         if (IS_ERR(inode))
1610                 goto err;
1611         ret = -ENOMEM;
1612         state = nfs4_get_open_state(inode, data->owner);
1613         if (state == NULL)
1614                 goto err_put_inode;
1615         if (data->o_res.delegation_type != 0)
1616                 nfs4_opendata_check_deleg(data, state);
1617         update_open_stateid(state, &data->o_res.stateid, NULL,
1618                         data->o_arg.fmode);
1619         iput(inode);
1620 out:
1621         nfs_release_seqid(data->o_arg.seqid);
1622         return state;
1623 err_put_inode:
1624         iput(inode);
1625 err:
1626         return ERR_PTR(ret);
1627 }
1628
1629 static struct nfs4_state *
1630 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1631 {
1632         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1633                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1634         return _nfs4_opendata_to_nfs4_state(data);
1635 }
1636
1637 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1638 {
1639         struct nfs_inode *nfsi = NFS_I(state->inode);
1640         struct nfs_open_context *ctx;
1641
1642         spin_lock(&state->inode->i_lock);
1643         list_for_each_entry(ctx, &nfsi->open_files, list) {
1644                 if (ctx->state != state)
1645                         continue;
1646                 get_nfs_open_context(ctx);
1647                 spin_unlock(&state->inode->i_lock);
1648                 return ctx;
1649         }
1650         spin_unlock(&state->inode->i_lock);
1651         return ERR_PTR(-ENOENT);
1652 }
1653
1654 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1655                 struct nfs4_state *state, enum open_claim_type4 claim)
1656 {
1657         struct nfs4_opendata *opendata;
1658
1659         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1660                         NULL, NULL, claim, GFP_NOFS);
1661         if (opendata == NULL)
1662                 return ERR_PTR(-ENOMEM);
1663         opendata->state = state;
1664         atomic_inc(&state->count);
1665         return opendata;
1666 }
1667
1668 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
1669                 fmode_t fmode)
1670 {
1671         struct nfs4_state *newstate;
1672         int ret;
1673
1674         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
1675                 return 0;
1676         opendata->o_arg.open_flags = 0;
1677         opendata->o_arg.fmode = fmode;
1678         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1679                         NFS_SB(opendata->dentry->d_sb),
1680                         fmode, 0);
1681         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1682         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1683         nfs4_init_opendata_res(opendata);
1684         ret = _nfs4_recover_proc_open(opendata);
1685         if (ret != 0)
1686                 return ret;
1687         newstate = nfs4_opendata_to_nfs4_state(opendata);
1688         if (IS_ERR(newstate))
1689                 return PTR_ERR(newstate);
1690         if (newstate != opendata->state)
1691                 ret = -ESTALE;
1692         nfs4_close_state(newstate, fmode);
1693         return ret;
1694 }
1695
1696 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1697 {
1698         int ret;
1699
1700         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1701         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1702         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1703         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1704         /* memory barrier prior to reading state->n_* */
1705         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1706         clear_bit(NFS_OPEN_STATE, &state->flags);
1707         smp_rmb();
1708         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1709         if (ret != 0)
1710                 return ret;
1711         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1712         if (ret != 0)
1713                 return ret;
1714         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
1715         if (ret != 0)
1716                 return ret;
1717         /*
1718          * We may have performed cached opens for all three recoveries.
1719          * Check if we need to update the current stateid.
1720          */
1721         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1722             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1723                 write_seqlock(&state->seqlock);
1724                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1725                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1726                 write_sequnlock(&state->seqlock);
1727         }
1728         return 0;
1729 }
1730
1731 /*
1732  * OPEN_RECLAIM:
1733  *      reclaim state on the server after a reboot.
1734  */
1735 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1736 {
1737         struct nfs_delegation *delegation;
1738         struct nfs4_opendata *opendata;
1739         fmode_t delegation_type = 0;
1740         int status;
1741
1742         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1743                         NFS4_OPEN_CLAIM_PREVIOUS);
1744         if (IS_ERR(opendata))
1745                 return PTR_ERR(opendata);
1746         rcu_read_lock();
1747         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1748         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1749                 delegation_type = delegation->type;
1750         rcu_read_unlock();
1751         opendata->o_arg.u.delegation_type = delegation_type;
1752         status = nfs4_open_recover(opendata, state);
1753         nfs4_opendata_put(opendata);
1754         return status;
1755 }
1756
1757 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1758 {
1759         struct nfs_server *server = NFS_SERVER(state->inode);
1760         struct nfs4_exception exception = { };
1761         int err;
1762         do {
1763                 err = _nfs4_do_open_reclaim(ctx, state);
1764                 trace_nfs4_open_reclaim(ctx, 0, err);
1765                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1766                         continue;
1767                 if (err != -NFS4ERR_DELAY)
1768                         break;
1769                 nfs4_handle_exception(server, err, &exception);
1770         } while (exception.retry);
1771         return err;
1772 }
1773
1774 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1775 {
1776         struct nfs_open_context *ctx;
1777         int ret;
1778
1779         ctx = nfs4_state_find_open_context(state);
1780         if (IS_ERR(ctx))
1781                 return -EAGAIN;
1782         ret = nfs4_do_open_reclaim(ctx, state);
1783         put_nfs_open_context(ctx);
1784         return ret;
1785 }
1786
1787 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1788 {
1789         switch (err) {
1790                 default:
1791                         printk(KERN_ERR "NFS: %s: unhandled error "
1792                                         "%d.\n", __func__, err);
1793                 case 0:
1794                 case -ENOENT:
1795                 case -EAGAIN:
1796                 case -ESTALE:
1797                         break;
1798                 case -NFS4ERR_BADSESSION:
1799                 case -NFS4ERR_BADSLOT:
1800                 case -NFS4ERR_BAD_HIGH_SLOT:
1801                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1802                 case -NFS4ERR_DEADSESSION:
1803                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1804                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1805                         return -EAGAIN;
1806                 case -NFS4ERR_STALE_CLIENTID:
1807                 case -NFS4ERR_STALE_STATEID:
1808                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1809                 case -NFS4ERR_EXPIRED:
1810                         /* Don't recall a delegation if it was lost */
1811                         nfs4_schedule_lease_recovery(server->nfs_client);
1812                         return -EAGAIN;
1813                 case -NFS4ERR_MOVED:
1814                         nfs4_schedule_migration_recovery(server);
1815                         return -EAGAIN;
1816                 case -NFS4ERR_LEASE_MOVED:
1817                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1818                         return -EAGAIN;
1819                 case -NFS4ERR_DELEG_REVOKED:
1820                 case -NFS4ERR_ADMIN_REVOKED:
1821                 case -NFS4ERR_BAD_STATEID:
1822                 case -NFS4ERR_OPENMODE:
1823                         nfs_inode_find_state_and_recover(state->inode,
1824                                         stateid);
1825                         nfs4_schedule_stateid_recovery(server, state);
1826                         return -EAGAIN;
1827                 case -NFS4ERR_DELAY:
1828                 case -NFS4ERR_GRACE:
1829                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1830                         ssleep(1);
1831                         return -EAGAIN;
1832                 case -ENOMEM:
1833                 case -NFS4ERR_DENIED:
1834                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1835                         return 0;
1836         }
1837         return err;
1838 }
1839
1840 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
1841                 struct nfs4_state *state, const nfs4_stateid *stateid,
1842                 fmode_t type)
1843 {
1844         struct nfs_server *server = NFS_SERVER(state->inode);
1845         struct nfs4_opendata *opendata;
1846         int err = 0;
1847
1848         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1849                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1850         if (IS_ERR(opendata))
1851                 return PTR_ERR(opendata);
1852         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1853         write_seqlock(&state->seqlock);
1854         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1855         write_sequnlock(&state->seqlock);
1856         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1857         switch (type & (FMODE_READ|FMODE_WRITE)) {
1858         case FMODE_READ|FMODE_WRITE:
1859         case FMODE_WRITE:
1860                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1861                 if (err)
1862                         break;
1863                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1864                 if (err)
1865                         break;
1866         case FMODE_READ:
1867                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
1868         }
1869         nfs4_opendata_put(opendata);
1870         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1871 }
1872
1873 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1874 {
1875         struct nfs4_opendata *data = calldata;
1876
1877         nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
1878                              &data->c_arg.seq_args, &data->c_res.seq_res, task);
1879 }
1880
1881 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1882 {
1883         struct nfs4_opendata *data = calldata;
1884
1885         nfs40_sequence_done(task, &data->c_res.seq_res);
1886
1887         data->rpc_status = task->tk_status;
1888         if (data->rpc_status == 0) {
1889                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1890                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1891                 renew_lease(data->o_res.server, data->timestamp);
1892                 data->rpc_done = 1;
1893         }
1894 }
1895
1896 static void nfs4_open_confirm_release(void *calldata)
1897 {
1898         struct nfs4_opendata *data = calldata;
1899         struct nfs4_state *state = NULL;
1900
1901         /* If this request hasn't been cancelled, do nothing */
1902         if (data->cancelled == 0)
1903                 goto out_free;
1904         /* In case of error, no cleanup! */
1905         if (!data->rpc_done)
1906                 goto out_free;
1907         state = nfs4_opendata_to_nfs4_state(data);
1908         if (!IS_ERR(state))
1909                 nfs4_close_state(state, data->o_arg.fmode);
1910 out_free:
1911         nfs4_opendata_put(data);
1912 }
1913
1914 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1915         .rpc_call_prepare = nfs4_open_confirm_prepare,
1916         .rpc_call_done = nfs4_open_confirm_done,
1917         .rpc_release = nfs4_open_confirm_release,
1918 };
1919
1920 /*
1921  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1922  */
1923 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1924 {
1925         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
1926         struct rpc_task *task;
1927         struct  rpc_message msg = {
1928                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1929                 .rpc_argp = &data->c_arg,
1930                 .rpc_resp = &data->c_res,
1931                 .rpc_cred = data->owner->so_cred,
1932         };
1933         struct rpc_task_setup task_setup_data = {
1934                 .rpc_client = server->client,
1935                 .rpc_message = &msg,
1936                 .callback_ops = &nfs4_open_confirm_ops,
1937                 .callback_data = data,
1938                 .workqueue = nfsiod_workqueue,
1939                 .flags = RPC_TASK_ASYNC,
1940         };
1941         int status;
1942
1943         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1944         kref_get(&data->kref);
1945         data->rpc_done = 0;
1946         data->rpc_status = 0;
1947         data->timestamp = jiffies;
1948         if (data->is_recover)
1949                 nfs4_set_sequence_privileged(&data->c_arg.seq_args);
1950         task = rpc_run_task(&task_setup_data);
1951         if (IS_ERR(task))
1952                 return PTR_ERR(task);
1953         status = nfs4_wait_for_completion_rpc_task(task);
1954         if (status != 0) {
1955                 data->cancelled = 1;
1956                 smp_wmb();
1957         } else
1958                 status = data->rpc_status;
1959         rpc_put_task(task);
1960         return status;
1961 }
1962
1963 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1964 {
1965         struct nfs4_opendata *data = calldata;
1966         struct nfs4_state_owner *sp = data->owner;
1967         struct nfs_client *clp = sp->so_server->nfs_client;
1968         enum open_claim_type4 claim = data->o_arg.claim;
1969
1970         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1971                 goto out_wait;
1972         /*
1973          * Check if we still need to send an OPEN call, or if we can use
1974          * a delegation instead.
1975          */
1976         if (data->state != NULL) {
1977                 struct nfs_delegation *delegation;
1978
1979                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
1980                         goto out_no_action;
1981                 rcu_read_lock();
1982                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
1983                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
1984                         goto unlock_no_action;
1985                 rcu_read_unlock();
1986         }
1987         /* Update client id. */
1988         data->o_arg.clientid = clp->cl_clientid;
1989         switch (claim) {
1990         default:
1991                 break;
1992         case NFS4_OPEN_CLAIM_PREVIOUS:
1993         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1994         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1995                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
1996         case NFS4_OPEN_CLAIM_FH:
1997                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
1998                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
1999         }
2000         data->timestamp = jiffies;
2001         if (nfs4_setup_sequence(data->o_arg.server,
2002                                 &data->o_arg.seq_args,
2003                                 &data->o_res.seq_res,
2004                                 task) != 0)
2005                 nfs_release_seqid(data->o_arg.seqid);
2006
2007         /* Set the create mode (note dependency on the session type) */
2008         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2009         if (data->o_arg.open_flags & O_EXCL) {
2010                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2011                 if (nfs4_has_persistent_session(clp))
2012                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2013                 else if (clp->cl_mvops->minor_version > 0)
2014                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2015         }
2016         return;
2017 unlock_no_action:
2018         rcu_read_unlock();
2019 out_no_action:
2020         task->tk_action = NULL;
2021 out_wait:
2022         nfs4_sequence_done(task, &data->o_res.seq_res);
2023 }
2024
2025 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2026 {
2027         struct nfs4_opendata *data = calldata;
2028
2029         data->rpc_status = task->tk_status;
2030
2031         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
2032                 return;
2033
2034         if (task->tk_status == 0) {
2035                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2036                         switch (data->o_res.f_attr->mode & S_IFMT) {
2037                         case S_IFREG:
2038                                 break;
2039                         case S_IFLNK:
2040                                 data->rpc_status = -ELOOP;
2041                                 break;
2042                         case S_IFDIR:
2043                                 data->rpc_status = -EISDIR;
2044                                 break;
2045                         default:
2046                                 data->rpc_status = -ENOTDIR;
2047                         }
2048                 }
2049                 renew_lease(data->o_res.server, data->timestamp);
2050                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2051                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2052         }
2053         data->rpc_done = 1;
2054 }
2055
2056 static void nfs4_open_release(void *calldata)
2057 {
2058         struct nfs4_opendata *data = calldata;
2059         struct nfs4_state *state = NULL;
2060
2061         /* If this request hasn't been cancelled, do nothing */
2062         if (data->cancelled == 0)
2063                 goto out_free;
2064         /* In case of error, no cleanup! */
2065         if (data->rpc_status != 0 || !data->rpc_done)
2066                 goto out_free;
2067         /* In case we need an open_confirm, no cleanup! */
2068         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2069                 goto out_free;
2070         state = nfs4_opendata_to_nfs4_state(data);
2071         if (!IS_ERR(state))
2072                 nfs4_close_state(state, data->o_arg.fmode);
2073 out_free:
2074         nfs4_opendata_put(data);
2075 }
2076
2077 static const struct rpc_call_ops nfs4_open_ops = {
2078         .rpc_call_prepare = nfs4_open_prepare,
2079         .rpc_call_done = nfs4_open_done,
2080         .rpc_release = nfs4_open_release,
2081 };
2082
2083 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
2084 {
2085         struct inode *dir = d_inode(data->dir);
2086         struct nfs_server *server = NFS_SERVER(dir);
2087         struct nfs_openargs *o_arg = &data->o_arg;
2088         struct nfs_openres *o_res = &data->o_res;
2089         struct rpc_task *task;
2090         struct rpc_message msg = {
2091                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2092                 .rpc_argp = o_arg,
2093                 .rpc_resp = o_res,
2094                 .rpc_cred = data->owner->so_cred,
2095         };
2096         struct rpc_task_setup task_setup_data = {
2097                 .rpc_client = server->client,
2098                 .rpc_message = &msg,
2099                 .callback_ops = &nfs4_open_ops,
2100                 .callback_data = data,
2101                 .workqueue = nfsiod_workqueue,
2102                 .flags = RPC_TASK_ASYNC,
2103         };
2104         int status;
2105
2106         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
2107         kref_get(&data->kref);
2108         data->rpc_done = 0;
2109         data->rpc_status = 0;
2110         data->cancelled = 0;
2111         data->is_recover = 0;
2112         if (isrecover) {
2113                 nfs4_set_sequence_privileged(&o_arg->seq_args);
2114                 data->is_recover = 1;
2115         }
2116         task = rpc_run_task(&task_setup_data);
2117         if (IS_ERR(task))
2118                 return PTR_ERR(task);
2119         status = nfs4_wait_for_completion_rpc_task(task);
2120         if (status != 0) {
2121                 data->cancelled = 1;
2122                 smp_wmb();
2123         } else
2124                 status = data->rpc_status;
2125         rpc_put_task(task);
2126
2127         return status;
2128 }
2129
2130 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2131 {
2132         struct inode *dir = d_inode(data->dir);
2133         struct nfs_openres *o_res = &data->o_res;
2134         int status;
2135
2136         status = nfs4_run_open_task(data, 1);
2137         if (status != 0 || !data->rpc_done)
2138                 return status;
2139
2140         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2141
2142         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2143                 status = _nfs4_proc_open_confirm(data);
2144                 if (status != 0)
2145                         return status;
2146         }
2147
2148         return status;
2149 }
2150
2151 /*
2152  * Additional permission checks in order to distinguish between an
2153  * open for read, and an open for execute. This works around the
2154  * fact that NFSv4 OPEN treats read and execute permissions as being
2155  * the same.
2156  * Note that in the non-execute case, we want to turn off permission
2157  * checking if we just created a new file (POSIX open() semantics).
2158  */
2159 static int nfs4_opendata_access(struct rpc_cred *cred,
2160                                 struct nfs4_opendata *opendata,
2161                                 struct nfs4_state *state, fmode_t fmode,
2162                                 int openflags)
2163 {
2164         struct nfs_access_entry cache;
2165         u32 mask;
2166
2167         /* access call failed or for some reason the server doesn't
2168          * support any access modes -- defer access call until later */
2169         if (opendata->o_res.access_supported == 0)
2170                 return 0;
2171
2172         mask = 0;
2173         /*
2174          * Use openflags to check for exec, because fmode won't
2175          * always have FMODE_EXEC set when file open for exec.
2176          */
2177         if (openflags & __FMODE_EXEC) {
2178                 /* ONLY check for exec rights */
2179                 mask = MAY_EXEC;
2180         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2181                 mask = MAY_READ;
2182
2183         cache.cred = cred;
2184         cache.jiffies = jiffies;
2185         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2186         nfs_access_add_cache(state->inode, &cache);
2187
2188         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2189                 return 0;
2190
2191         /* even though OPEN succeeded, access is denied. Close the file */
2192         nfs4_close_state(state, fmode);
2193         return -EACCES;
2194 }
2195
2196 /*
2197  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2198  */
2199 static int _nfs4_proc_open(struct nfs4_opendata *data)
2200 {
2201         struct inode *dir = d_inode(data->dir);
2202         struct nfs_server *server = NFS_SERVER(dir);
2203         struct nfs_openargs *o_arg = &data->o_arg;
2204         struct nfs_openres *o_res = &data->o_res;
2205         int status;
2206
2207         status = nfs4_run_open_task(data, 0);
2208         if (!data->rpc_done)
2209                 return status;
2210         if (status != 0) {
2211                 if (status == -NFS4ERR_BADNAME &&
2212                                 !(o_arg->open_flags & O_CREAT))
2213                         return -ENOENT;
2214                 return status;
2215         }
2216
2217         nfs_fattr_map_and_free_names(server, &data->f_attr);
2218
2219         if (o_arg->open_flags & O_CREAT) {
2220                 update_changeattr(dir, &o_res->cinfo);
2221                 if (o_arg->open_flags & O_EXCL)
2222                         data->file_created = 1;
2223                 else if (o_res->cinfo.before != o_res->cinfo.after)
2224                         data->file_created = 1;
2225         }
2226         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2227                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2228         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2229                 status = _nfs4_proc_open_confirm(data);
2230                 if (status != 0)
2231                         return status;
2232         }
2233         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2234                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2235         return 0;
2236 }
2237
2238 static int nfs4_recover_expired_lease(struct nfs_server *server)
2239 {
2240         return nfs4_client_recover_expired_lease(server->nfs_client);
2241 }
2242
2243 /*
2244  * OPEN_EXPIRED:
2245  *      reclaim state on the server after a network partition.
2246  *      Assumes caller holds the appropriate lock
2247  */
2248 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2249 {
2250         struct nfs4_opendata *opendata;
2251         int ret;
2252
2253         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2254                         NFS4_OPEN_CLAIM_FH);
2255         if (IS_ERR(opendata))
2256                 return PTR_ERR(opendata);
2257         ret = nfs4_open_recover(opendata, state);
2258         if (ret == -ESTALE)
2259                 d_drop(ctx->dentry);
2260         nfs4_opendata_put(opendata);
2261         return ret;
2262 }
2263
2264 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2265 {
2266         struct nfs_server *server = NFS_SERVER(state->inode);
2267         struct nfs4_exception exception = { };
2268         int err;
2269
2270         do {
2271                 err = _nfs4_open_expired(ctx, state);
2272                 trace_nfs4_open_expired(ctx, 0, err);
2273                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2274                         continue;
2275                 switch (err) {
2276                 default:
2277                         goto out;
2278                 case -NFS4ERR_GRACE:
2279                 case -NFS4ERR_DELAY:
2280                         nfs4_handle_exception(server, err, &exception);
2281                         err = 0;
2282                 }
2283         } while (exception.retry);
2284 out:
2285         return err;
2286 }
2287
2288 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2289 {
2290         struct nfs_open_context *ctx;
2291         int ret;
2292
2293         ctx = nfs4_state_find_open_context(state);
2294         if (IS_ERR(ctx))
2295                 return -EAGAIN;
2296         ret = nfs4_do_open_expired(ctx, state);
2297         put_nfs_open_context(ctx);
2298         return ret;
2299 }
2300
2301 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2302 {
2303         nfs_remove_bad_delegation(state->inode);
2304         write_seqlock(&state->seqlock);
2305         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2306         write_sequnlock(&state->seqlock);
2307         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2308 }
2309
2310 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2311 {
2312         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2313                 nfs_finish_clear_delegation_stateid(state);
2314 }
2315
2316 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2317 {
2318         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2319         nfs40_clear_delegation_stateid(state);
2320         return nfs4_open_expired(sp, state);
2321 }
2322
2323 #if defined(CONFIG_NFS_V4_1)
2324 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2325 {
2326         struct nfs_server *server = NFS_SERVER(state->inode);
2327         nfs4_stateid stateid;
2328         struct nfs_delegation *delegation;
2329         struct rpc_cred *cred;
2330         int status;
2331
2332         /* Get the delegation credential for use by test/free_stateid */
2333         rcu_read_lock();
2334         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2335         if (delegation == NULL) {
2336                 rcu_read_unlock();
2337                 return;
2338         }
2339
2340         nfs4_stateid_copy(&stateid, &delegation->stateid);
2341         cred = get_rpccred(delegation->cred);
2342         rcu_read_unlock();
2343         status = nfs41_test_stateid(server, &stateid, cred);
2344         trace_nfs4_test_delegation_stateid(state, NULL, status);
2345
2346         if (status != NFS_OK) {
2347                 /* Free the stateid unless the server explicitly
2348                  * informs us the stateid is unrecognized. */
2349                 if (status != -NFS4ERR_BAD_STATEID)
2350                         nfs41_free_stateid(server, &stateid, cred);
2351                 nfs_finish_clear_delegation_stateid(state);
2352         }
2353
2354         put_rpccred(cred);
2355 }
2356
2357 /**
2358  * nfs41_check_open_stateid - possibly free an open stateid
2359  *
2360  * @state: NFSv4 state for an inode
2361  *
2362  * Returns NFS_OK if recovery for this stateid is now finished.
2363  * Otherwise a negative NFS4ERR value is returned.
2364  */
2365 static int nfs41_check_open_stateid(struct nfs4_state *state)
2366 {
2367         struct nfs_server *server = NFS_SERVER(state->inode);
2368         nfs4_stateid *stateid = &state->open_stateid;
2369         struct rpc_cred *cred = state->owner->so_cred;
2370         int status;
2371
2372         /* If a state reset has been done, test_stateid is unneeded */
2373         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2374             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2375             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2376                 return -NFS4ERR_BAD_STATEID;
2377
2378         status = nfs41_test_stateid(server, stateid, cred);
2379         trace_nfs4_test_open_stateid(state, NULL, status);
2380         if (status != NFS_OK) {
2381                 /* Free the stateid unless the server explicitly
2382                  * informs us the stateid is unrecognized. */
2383                 if (status != -NFS4ERR_BAD_STATEID)
2384                         nfs41_free_stateid(server, stateid, cred);
2385
2386                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2387                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2388                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2389                 clear_bit(NFS_OPEN_STATE, &state->flags);
2390         }
2391         return status;
2392 }
2393
2394 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2395 {
2396         int status;
2397
2398         nfs41_check_delegation_stateid(state);
2399         status = nfs41_check_open_stateid(state);
2400         if (status != NFS_OK)
2401                 status = nfs4_open_expired(sp, state);
2402         return status;
2403 }
2404 #endif
2405
2406 /*
2407  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2408  * fields corresponding to attributes that were used to store the verifier.
2409  * Make sure we clobber those fields in the later setattr call
2410  */
2411 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2412                                 struct iattr *sattr, struct nfs4_label **label)
2413 {
2414         const u32 *attrset = opendata->o_res.attrset;
2415
2416         if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2417             !(sattr->ia_valid & ATTR_ATIME_SET))
2418                 sattr->ia_valid |= ATTR_ATIME;
2419
2420         if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2421             !(sattr->ia_valid & ATTR_MTIME_SET))
2422                 sattr->ia_valid |= ATTR_MTIME;
2423
2424         /* Except MODE, it seems harmless of setting twice. */
2425         if ((attrset[1] & FATTR4_WORD1_MODE))
2426                 sattr->ia_valid &= ~ATTR_MODE;
2427
2428         if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL)
2429                 *label = NULL;
2430 }
2431
2432 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2433                 fmode_t fmode,
2434                 int flags,
2435                 struct nfs_open_context *ctx)
2436 {
2437         struct nfs4_state_owner *sp = opendata->owner;
2438         struct nfs_server *server = sp->so_server;
2439         struct dentry *dentry;
2440         struct nfs4_state *state;
2441         unsigned int seq;
2442         int ret;
2443
2444         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2445
2446         ret = _nfs4_proc_open(opendata);
2447         if (ret != 0)
2448                 goto out;
2449
2450         state = nfs4_opendata_to_nfs4_state(opendata);
2451         ret = PTR_ERR(state);
2452         if (IS_ERR(state))
2453                 goto out;
2454         if (server->caps & NFS_CAP_POSIX_LOCK)
2455                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2456
2457         dentry = opendata->dentry;
2458         if (d_really_is_negative(dentry)) {
2459                 /* FIXME: Is this d_drop() ever needed? */
2460                 d_drop(dentry);
2461                 dentry = d_add_unique(dentry, igrab(state->inode));
2462                 if (dentry == NULL) {
2463                         dentry = opendata->dentry;
2464                 } else if (dentry != ctx->dentry) {
2465                         dput(ctx->dentry);
2466                         ctx->dentry = dget(dentry);
2467                 }
2468                 nfs_set_verifier(dentry,
2469                                 nfs_save_change_attribute(d_inode(opendata->dir)));
2470         }
2471
2472         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2473         if (ret != 0)
2474                 goto out;
2475
2476         ctx->state = state;
2477         if (d_inode(dentry) == state->inode) {
2478                 nfs_inode_attach_open_context(ctx);
2479                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2480                         nfs4_schedule_stateid_recovery(server, state);
2481         }
2482 out:
2483         return ret;
2484 }
2485
2486 /*
2487  * Returns a referenced nfs4_state
2488  */
2489 static int _nfs4_do_open(struct inode *dir,
2490                         struct nfs_open_context *ctx,
2491                         int flags,
2492                         struct iattr *sattr,
2493                         struct nfs4_label *label,
2494                         int *opened)
2495 {
2496         struct nfs4_state_owner  *sp;
2497         struct nfs4_state     *state = NULL;
2498         struct nfs_server       *server = NFS_SERVER(dir);
2499         struct nfs4_opendata *opendata;
2500         struct dentry *dentry = ctx->dentry;
2501         struct rpc_cred *cred = ctx->cred;
2502         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2503         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2504         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2505         struct nfs4_label *olabel = NULL;
2506         int status;
2507
2508         /* Protect against reboot recovery conflicts */
2509         status = -ENOMEM;
2510         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2511         if (sp == NULL) {
2512                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2513                 goto out_err;
2514         }
2515         status = nfs4_recover_expired_lease(server);
2516         if (status != 0)
2517                 goto err_put_state_owner;
2518         if (d_really_is_positive(dentry))
2519                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2520         status = -ENOMEM;
2521         if (d_really_is_positive(dentry))
2522                 claim = NFS4_OPEN_CLAIM_FH;
2523         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2524                         label, claim, GFP_KERNEL);
2525         if (opendata == NULL)
2526                 goto err_put_state_owner;
2527
2528         if (label) {
2529                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2530                 if (IS_ERR(olabel)) {
2531                         status = PTR_ERR(olabel);
2532                         goto err_opendata_put;
2533                 }
2534         }
2535
2536         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2537                 if (!opendata->f_attr.mdsthreshold) {
2538                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2539                         if (!opendata->f_attr.mdsthreshold)
2540                                 goto err_free_label;
2541                 }
2542                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2543         }
2544         if (d_really_is_positive(dentry))
2545                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2546
2547         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2548         if (status != 0)
2549                 goto err_free_label;
2550         state = ctx->state;
2551
2552         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
2553             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2554                 nfs4_exclusive_attrset(opendata, sattr, &label);
2555
2556                 nfs_fattr_init(opendata->o_res.f_attr);
2557                 status = nfs4_do_setattr(state->inode, cred,
2558                                 opendata->o_res.f_attr, sattr,
2559                                 state, label, olabel);
2560                 if (status == 0) {
2561                         nfs_setattr_update_inode(state->inode, sattr,
2562                                         opendata->o_res.f_attr);
2563                         nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2564                 }
2565         }
2566         if (opened && opendata->file_created)
2567                 *opened |= FILE_CREATED;
2568
2569         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2570                 *ctx_th = opendata->f_attr.mdsthreshold;
2571                 opendata->f_attr.mdsthreshold = NULL;
2572         }
2573
2574         nfs4_label_free(olabel);
2575
2576         nfs4_opendata_put(opendata);
2577         nfs4_put_state_owner(sp);
2578         return 0;
2579 err_free_label:
2580         nfs4_label_free(olabel);
2581 err_opendata_put:
2582         nfs4_opendata_put(opendata);
2583 err_put_state_owner:
2584         nfs4_put_state_owner(sp);
2585 out_err:
2586         return status;
2587 }
2588
2589
2590 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2591                                         struct nfs_open_context *ctx,
2592                                         int flags,
2593                                         struct iattr *sattr,
2594                                         struct nfs4_label *label,
2595                                         int *opened)
2596 {
2597         struct nfs_server *server = NFS_SERVER(dir);
2598         struct nfs4_exception exception = { };
2599         struct nfs4_state *res;
2600         int status;
2601
2602         do {
2603                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2604                 res = ctx->state;
2605                 trace_nfs4_open_file(ctx, flags, status);
2606                 if (status == 0)
2607                         break;
2608                 /* NOTE: BAD_SEQID means the server and client disagree about the
2609                  * book-keeping w.r.t. state-changing operations
2610                  * (OPEN/CLOSE/LOCK/LOCKU...)
2611                  * It is actually a sign of a bug on the client or on the server.
2612                  *
2613                  * If we receive a BAD_SEQID error in the particular case of
2614                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2615                  * have unhashed the old state_owner for us, and that we can
2616                  * therefore safely retry using a new one. We should still warn
2617                  * the user though...
2618                  */
2619                 if (status == -NFS4ERR_BAD_SEQID) {
2620                         pr_warn_ratelimited("NFS: v4 server %s "
2621                                         " returned a bad sequence-id error!\n",
2622                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2623                         exception.retry = 1;
2624                         continue;
2625                 }
2626                 /*
2627                  * BAD_STATEID on OPEN means that the server cancelled our
2628                  * state before it received the OPEN_CONFIRM.
2629                  * Recover by retrying the request as per the discussion
2630                  * on Page 181 of RFC3530.
2631                  */
2632                 if (status == -NFS4ERR_BAD_STATEID) {
2633                         exception.retry = 1;
2634                         continue;
2635                 }
2636                 if (status == -EAGAIN) {
2637                         /* We must have found a delegation */
2638                         exception.retry = 1;
2639                         continue;
2640                 }
2641                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2642                         continue;
2643                 res = ERR_PTR(nfs4_handle_exception(server,
2644                                         status, &exception));
2645         } while (exception.retry);
2646         return res;
2647 }
2648
2649 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2650                             struct nfs_fattr *fattr, struct iattr *sattr,
2651                             struct nfs4_state *state, struct nfs4_label *ilabel,
2652                             struct nfs4_label *olabel)
2653 {
2654         struct nfs_server *server = NFS_SERVER(inode);
2655         struct nfs_setattrargs  arg = {
2656                 .fh             = NFS_FH(inode),
2657                 .iap            = sattr,
2658                 .server         = server,
2659                 .bitmask = server->attr_bitmask,
2660                 .label          = ilabel,
2661         };
2662         struct nfs_setattrres  res = {
2663                 .fattr          = fattr,
2664                 .label          = olabel,
2665                 .server         = server,
2666         };
2667         struct rpc_message msg = {
2668                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2669                 .rpc_argp       = &arg,
2670                 .rpc_resp       = &res,
2671                 .rpc_cred       = cred,
2672         };
2673         unsigned long timestamp = jiffies;
2674         fmode_t fmode;
2675         bool truncate;
2676         int status;
2677
2678         arg.bitmask = nfs4_bitmask(server, ilabel);
2679         if (ilabel)
2680                 arg.bitmask = nfs4_bitmask(server, olabel);
2681
2682         nfs_fattr_init(fattr);
2683
2684         /* Servers should only apply open mode checks for file size changes */
2685         truncate = (sattr->ia_valid & ATTR_SIZE) ? true : false;
2686         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2687
2688         if (nfs4_copy_delegation_stateid(&arg.stateid, inode, fmode)) {
2689                 /* Use that stateid */
2690         } else if (truncate && state != NULL) {
2691                 struct nfs_lockowner lockowner = {
2692                         .l_owner = current->files,
2693                         .l_pid = current->tgid,
2694                 };
2695                 if (!nfs4_valid_open_stateid(state))
2696                         return -EBADF;
2697                 if (nfs4_select_rw_stateid(&arg.stateid, state, FMODE_WRITE,
2698                                 &lockowner) == -EIO)
2699                         return -EBADF;
2700         } else
2701                 nfs4_stateid_copy(&arg.stateid, &zero_stateid);
2702
2703         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
2704         if (status == 0 && state != NULL)
2705                 renew_lease(server, timestamp);
2706         return status;
2707 }
2708
2709 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2710                            struct nfs_fattr *fattr, struct iattr *sattr,
2711                            struct nfs4_state *state, struct nfs4_label *ilabel,
2712                            struct nfs4_label *olabel)
2713 {
2714         struct nfs_server *server = NFS_SERVER(inode);
2715         struct nfs4_exception exception = {
2716                 .state = state,
2717                 .inode = inode,
2718         };
2719         int err;
2720         do {
2721                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
2722                 trace_nfs4_setattr(inode, err);
2723                 switch (err) {
2724                 case -NFS4ERR_OPENMODE:
2725                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2726                                 pr_warn_once("NFSv4: server %s is incorrectly "
2727                                                 "applying open mode checks to "
2728                                                 "a SETATTR that is not "
2729                                                 "changing file size.\n",
2730                                                 server->nfs_client->cl_hostname);
2731                         }
2732                         if (state && !(state->state & FMODE_WRITE)) {
2733                                 err = -EBADF;
2734                                 if (sattr->ia_valid & ATTR_OPEN)
2735                                         err = -EACCES;
2736                                 goto out;
2737                         }
2738                 }
2739                 err = nfs4_handle_exception(server, err, &exception);
2740         } while (exception.retry);
2741 out:
2742         return err;
2743 }
2744
2745 static bool
2746 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
2747 {
2748         if (inode == NULL || !nfs_have_layout(inode))
2749                 return false;
2750
2751         return pnfs_wait_on_layoutreturn(inode, task);
2752 }
2753
2754 struct nfs4_closedata {
2755         struct inode *inode;
2756         struct nfs4_state *state;
2757         struct nfs_closeargs arg;
2758         struct nfs_closeres res;
2759         struct nfs_fattr fattr;
2760         unsigned long timestamp;
2761         bool roc;
2762         u32 roc_barrier;
2763 };
2764
2765 static void nfs4_free_closedata(void *data)
2766 {
2767         struct nfs4_closedata *calldata = data;
2768         struct nfs4_state_owner *sp = calldata->state->owner;
2769         struct super_block *sb = calldata->state->inode->i_sb;
2770
2771         if (calldata->roc)
2772                 pnfs_roc_release(calldata->state->inode);
2773         nfs4_put_open_state(calldata->state);
2774         nfs_free_seqid(calldata->arg.seqid);
2775         nfs4_put_state_owner(sp);
2776         nfs_sb_deactive(sb);
2777         kfree(calldata);
2778 }
2779
2780 static void nfs4_close_done(struct rpc_task *task, void *data)
2781 {
2782         struct nfs4_closedata *calldata = data;
2783         struct nfs4_state *state = calldata->state;
2784         struct nfs_server *server = NFS_SERVER(calldata->inode);
2785         nfs4_stateid *res_stateid = NULL;
2786
2787         dprintk("%s: begin!\n", __func__);
2788         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2789                 return;
2790         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2791         /* hmm. we are done with the inode, and in the process of freeing
2792          * the state_owner. we keep this around to process errors
2793          */
2794         switch (task->tk_status) {
2795                 case 0:
2796                         res_stateid = &calldata->res.stateid;
2797                         if (calldata->roc)
2798                                 pnfs_roc_set_barrier(state->inode,
2799                                                      calldata->roc_barrier);
2800                         renew_lease(server, calldata->timestamp);
2801                         break;
2802                 case -NFS4ERR_ADMIN_REVOKED:
2803                 case -NFS4ERR_STALE_STATEID:
2804                 case -NFS4ERR_OLD_STATEID:
2805                 case -NFS4ERR_BAD_STATEID:
2806                 case -NFS4ERR_EXPIRED:
2807                         if (!nfs4_stateid_match(&calldata->arg.stateid,
2808                                                 &state->open_stateid)) {
2809                                 rpc_restart_call_prepare(task);
2810                                 goto out_release;
2811                         }
2812                         if (calldata->arg.fmode == 0)
2813                                 break;
2814                 default:
2815                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2816                                 rpc_restart_call_prepare(task);
2817                                 goto out_release;
2818                         }
2819         }
2820         nfs_clear_open_stateid(state, &calldata->arg.stateid,
2821                         res_stateid, calldata->arg.fmode);
2822 out_release:
2823         nfs_release_seqid(calldata->arg.seqid);
2824         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2825         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2826 }
2827
2828 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2829 {
2830         struct nfs4_closedata *calldata = data;
2831         struct nfs4_state *state = calldata->state;
2832         struct inode *inode = calldata->inode;
2833         bool is_rdonly, is_wronly, is_rdwr;
2834         int call_close = 0;
2835
2836         dprintk("%s: begin!\n", __func__);
2837         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2838                 goto out_wait;
2839
2840         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2841         spin_lock(&state->owner->so_lock);
2842         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2843         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2844         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2845         nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
2846         /* Calculate the change in open mode */
2847         calldata->arg.fmode = 0;
2848         if (state->n_rdwr == 0) {
2849                 if (state->n_rdonly == 0)
2850                         call_close |= is_rdonly;
2851                 else if (is_rdonly)
2852                         calldata->arg.fmode |= FMODE_READ;
2853                 if (state->n_wronly == 0)
2854                         call_close |= is_wronly;
2855                 else if (is_wronly)
2856                         calldata->arg.fmode |= FMODE_WRITE;
2857         } else if (is_rdwr)
2858                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2859
2860         if (calldata->arg.fmode == 0)
2861                 call_close |= is_rdwr;
2862
2863         if (!nfs4_valid_open_stateid(state))
2864                 call_close = 0;
2865         spin_unlock(&state->owner->so_lock);
2866
2867         if (!call_close) {
2868                 /* Note: exit _without_ calling nfs4_close_done */
2869                 goto out_no_action;
2870         }
2871
2872         if (nfs4_wait_on_layoutreturn(inode, task)) {
2873                 nfs_release_seqid(calldata->arg.seqid);
2874                 goto out_wait;
2875         }
2876
2877         if (calldata->arg.fmode == 0)
2878                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2879         if (calldata->roc)
2880                 pnfs_roc_get_barrier(inode, &calldata->roc_barrier);
2881
2882         calldata->arg.share_access =
2883                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
2884                                 calldata->arg.fmode, 0);
2885
2886         nfs_fattr_init(calldata->res.fattr);
2887         calldata->timestamp = jiffies;
2888         if (nfs4_setup_sequence(NFS_SERVER(inode),
2889                                 &calldata->arg.seq_args,
2890                                 &calldata->res.seq_res,
2891                                 task) != 0)
2892                 nfs_release_seqid(calldata->arg.seqid);
2893         dprintk("%s: done!\n", __func__);
2894         return;
2895 out_no_action:
2896         task->tk_action = NULL;
2897 out_wait:
2898         nfs4_sequence_done(task, &calldata->res.seq_res);
2899 }
2900
2901 static const struct rpc_call_ops nfs4_close_ops = {
2902         .rpc_call_prepare = nfs4_close_prepare,
2903         .rpc_call_done = nfs4_close_done,
2904         .rpc_release = nfs4_free_closedata,
2905 };
2906
2907 static bool nfs4_roc(struct inode *inode)
2908 {
2909         if (!nfs_have_layout(inode))
2910                 return false;
2911         return pnfs_roc(inode);
2912 }
2913
2914 /*
2915  * It is possible for data to be read/written from a mem-mapped file
2916  * after the sys_close call (which hits the vfs layer as a flush).
2917  * This means that we can't safely call nfsv4 close on a file until
2918  * the inode is cleared. This in turn means that we are not good
2919  * NFSv4 citizens - we do not indicate to the server to update the file's
2920  * share state even when we are done with one of the three share
2921  * stateid's in the inode.
2922  *
2923  * NOTE: Caller must be holding the sp->so_owner semaphore!
2924  */
2925 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2926 {
2927         struct nfs_server *server = NFS_SERVER(state->inode);
2928         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
2929         struct nfs4_closedata *calldata;
2930         struct nfs4_state_owner *sp = state->owner;
2931         struct rpc_task *task;
2932         struct rpc_message msg = {
2933                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2934                 .rpc_cred = state->owner->so_cred,
2935         };
2936         struct rpc_task_setup task_setup_data = {
2937                 .rpc_client = server->client,
2938                 .rpc_message = &msg,
2939                 .callback_ops = &nfs4_close_ops,
2940                 .workqueue = nfsiod_workqueue,
2941                 .flags = RPC_TASK_ASYNC,
2942         };
2943         int status = -ENOMEM;
2944
2945         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2946                 &task_setup_data.rpc_client, &msg);
2947
2948         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2949         if (calldata == NULL)
2950                 goto out;
2951         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2952         calldata->inode = state->inode;
2953         calldata->state = state;
2954         calldata->arg.fh = NFS_FH(state->inode);
2955         /* Serialization for the sequence id */
2956         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
2957         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2958         if (IS_ERR(calldata->arg.seqid))
2959                 goto out_free_calldata;
2960         calldata->arg.fmode = 0;
2961         calldata->arg.bitmask = server->cache_consistency_bitmask;
2962         calldata->res.fattr = &calldata->fattr;
2963         calldata->res.seqid = calldata->arg.seqid;
2964         calldata->res.server = server;
2965         calldata->roc = nfs4_roc(state->inode);
2966         nfs_sb_active(calldata->inode->i_sb);
2967
2968         msg.rpc_argp = &calldata->arg;
2969         msg.rpc_resp = &calldata->res;
2970         task_setup_data.callback_data = calldata;
2971         task = rpc_run_task(&task_setup_data);
2972         if (IS_ERR(task))
2973                 return PTR_ERR(task);
2974         status = 0;
2975         if (wait)
2976                 status = rpc_wait_for_completion_task(task);
2977         rpc_put_task(task);
2978         return status;
2979 out_free_calldata:
2980         kfree(calldata);
2981 out:
2982         nfs4_put_open_state(state);
2983         nfs4_put_state_owner(sp);
2984         return status;
2985 }
2986
2987 static struct inode *
2988 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
2989                 int open_flags, struct iattr *attr, int *opened)
2990 {
2991         struct nfs4_state *state;
2992         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
2993
2994         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
2995
2996         /* Protect against concurrent sillydeletes */
2997         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
2998
2999         nfs4_label_release_security(label);
3000
3001         if (IS_ERR(state))
3002                 return ERR_CAST(state);
3003         return state->inode;
3004 }
3005
3006 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3007 {
3008         if (ctx->state == NULL)
3009                 return;
3010         if (is_sync)
3011                 nfs4_close_sync(ctx->state, ctx->mode);
3012         else
3013                 nfs4_close_state(ctx->state, ctx->mode);
3014 }
3015
3016 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3017 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3018 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
3019
3020 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3021 {
3022         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3023         struct nfs4_server_caps_arg args = {
3024                 .fhandle = fhandle,
3025                 .bitmask = bitmask,
3026         };
3027         struct nfs4_server_caps_res res = {};
3028         struct rpc_message msg = {
3029                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3030                 .rpc_argp = &args,
3031                 .rpc_resp = &res,
3032         };
3033         int status;
3034
3035         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3036                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3037                      FATTR4_WORD0_LINK_SUPPORT |
3038                      FATTR4_WORD0_SYMLINK_SUPPORT |
3039                      FATTR4_WORD0_ACLSUPPORT;
3040         if (minorversion)
3041                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3042
3043         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3044         if (status == 0) {
3045                 /* Sanity check the server answers */
3046                 switch (minorversion) {
3047                 case 0:
3048                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3049                         res.attr_bitmask[2] = 0;
3050                         break;
3051                 case 1:
3052                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3053                         break;
3054                 case 2:
3055                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3056                 }
3057                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3058                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3059                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3060                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3061                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3062                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
3063                                 NFS_CAP_SECURITY_LABEL);
3064                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3065                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3066                         server->caps |= NFS_CAP_ACLS;
3067                 if (res.has_links != 0)
3068                         server->caps |= NFS_CAP_HARDLINKS;
3069                 if (res.has_symlinks != 0)
3070                         server->caps |= NFS_CAP_SYMLINKS;
3071                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3072                         server->caps |= NFS_CAP_FILEID;
3073                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3074                         server->caps |= NFS_CAP_MODE;
3075                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3076                         server->caps |= NFS_CAP_NLINK;
3077                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3078                         server->caps |= NFS_CAP_OWNER;
3079                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3080                         server->caps |= NFS_CAP_OWNER_GROUP;
3081                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3082                         server->caps |= NFS_CAP_ATIME;
3083                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3084                         server->caps |= NFS_CAP_CTIME;
3085                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3086                         server->caps |= NFS_CAP_MTIME;
3087 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3088                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3089                         server->caps |= NFS_CAP_SECURITY_LABEL;
3090 #endif
3091                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3092                                 sizeof(server->attr_bitmask));
3093                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3094
3095                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3096                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3097                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3098                 server->cache_consistency_bitmask[2] = 0;
3099                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3100                         sizeof(server->exclcreat_bitmask));
3101                 server->acl_bitmask = res.acl_bitmask;
3102                 server->fh_expire_type = res.fh_expire_type;
3103         }
3104
3105         return status;
3106 }
3107
3108 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3109 {
3110         struct nfs4_exception exception = { };
3111         int err;
3112         do {
3113                 err = nfs4_handle_exception(server,
3114                                 _nfs4_server_capabilities(server, fhandle),
3115                                 &exception);
3116         } while (exception.retry);
3117         return err;
3118 }
3119
3120 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3121                 struct nfs_fsinfo *info)
3122 {
3123         u32 bitmask[3];
3124         struct nfs4_lookup_root_arg args = {
3125                 .bitmask = bitmask,
3126         };
3127         struct nfs4_lookup_res res = {
3128                 .server = server,
3129                 .fattr = info->fattr,
3130                 .fh = fhandle,
3131         };
3132         struct rpc_message msg = {
3133                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3134                 .rpc_argp = &args,
3135                 .rpc_resp = &res,
3136         };
3137
3138         bitmask[0] = nfs4_fattr_bitmap[0];
3139         bitmask[1] = nfs4_fattr_bitmap[1];
3140         /*
3141          * Process the label in the upcoming getfattr
3142          */
3143         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3144
3145         nfs_fattr_init(info->fattr);
3146         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3147 }
3148
3149 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3150                 struct nfs_fsinfo *info)
3151 {
3152         struct nfs4_exception exception = { };
3153         int err;
3154         do {
3155                 err = _nfs4_lookup_root(server, fhandle, info);
3156                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3157                 switch (err) {
3158                 case 0:
3159                 case -NFS4ERR_WRONGSEC:
3160                         goto out;
3161                 default:
3162                         err = nfs4_handle_exception(server, err, &exception);
3163                 }
3164         } while (exception.retry);
3165 out:
3166         return err;
3167 }
3168
3169 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3170                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3171 {
3172         struct rpc_auth_create_args auth_args = {
3173                 .pseudoflavor = flavor,
3174         };
3175         struct rpc_auth *auth;
3176         int ret;
3177
3178         auth = rpcauth_create(&auth_args, server->client);
3179         if (IS_ERR(auth)) {
3180                 ret = -EACCES;
3181                 goto out;
3182         }
3183         ret = nfs4_lookup_root(server, fhandle, info);
3184 out:
3185         return ret;
3186 }
3187
3188 /*
3189  * Retry pseudoroot lookup with various security flavors.  We do this when:
3190  *
3191  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3192  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3193  *
3194  * Returns zero on success, or a negative NFS4ERR value, or a
3195  * negative errno value.
3196  */
3197 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3198                               struct nfs_fsinfo *info)
3199 {
3200         /* Per 3530bis 15.33.5 */
3201         static const rpc_authflavor_t flav_array[] = {
3202                 RPC_AUTH_GSS_KRB5P,
3203                 RPC_AUTH_GSS_KRB5I,
3204                 RPC_AUTH_GSS_KRB5,
3205                 RPC_AUTH_UNIX,                  /* courtesy */
3206                 RPC_AUTH_NULL,
3207         };
3208         int status = -EPERM;
3209         size_t i;
3210
3211         if (server->auth_info.flavor_len > 0) {
3212                 /* try each flavor specified by user */
3213                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3214                         status = nfs4_lookup_root_sec(server, fhandle, info,
3215                                                 server->auth_info.flavors[i]);
3216                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3217                                 continue;
3218                         break;
3219                 }
3220         } else {
3221                 /* no flavors specified by user, try default list */
3222                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3223                         status = nfs4_lookup_root_sec(server, fhandle, info,
3224                                                       flav_array[i]);
3225                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3226                                 continue;
3227                         break;
3228                 }
3229         }
3230
3231         /*
3232          * -EACCESS could mean that the user doesn't have correct permissions
3233          * to access the mount.  It could also mean that we tried to mount
3234          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3235          * existing mount programs don't handle -EACCES very well so it should
3236          * be mapped to -EPERM instead.
3237          */
3238         if (status == -EACCES)
3239                 status = -EPERM;
3240         return status;
3241 }
3242
3243 static int nfs4_do_find_root_sec(struct nfs_server *server,
3244                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3245 {
3246         int mv = server->nfs_client->cl_minorversion;
3247         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3248 }
3249
3250 /**
3251  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3252  * @server: initialized nfs_server handle
3253  * @fhandle: we fill in the pseudo-fs root file handle
3254  * @info: we fill in an FSINFO struct
3255  * @auth_probe: probe the auth flavours
3256  *
3257  * Returns zero on success, or a negative errno.
3258  */
3259 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3260                          struct nfs_fsinfo *info,
3261                          bool auth_probe)
3262 {
3263         int status = 0;
3264
3265         if (!auth_probe)
3266                 status = nfs4_lookup_root(server, fhandle, info);
3267
3268         if (auth_probe || status == NFS4ERR_WRONGSEC)
3269                 status = nfs4_do_find_root_sec(server, fhandle, info);
3270
3271         if (status == 0)
3272                 status = nfs4_server_capabilities(server, fhandle);
3273         if (status == 0)
3274                 status = nfs4_do_fsinfo(server, fhandle, info);
3275
3276         return nfs4_map_errors(status);
3277 }
3278
3279 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3280                               struct nfs_fsinfo *info)
3281 {
3282         int error;
3283         struct nfs_fattr *fattr = info->fattr;
3284         struct nfs4_label *label = NULL;
3285
3286         error = nfs4_server_capabilities(server, mntfh);
3287         if (error < 0) {
3288                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3289                 return error;
3290         }
3291
3292         label = nfs4_label_alloc(server, GFP_KERNEL);
3293         if (IS_ERR(label))
3294                 return PTR_ERR(label);
3295
3296         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3297         if (error < 0) {
3298                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3299                 goto err_free_label;
3300         }
3301
3302         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3303             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3304                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3305
3306 err_free_label:
3307         nfs4_label_free(label);
3308
3309         return error;
3310 }
3311
3312 /*
3313  * Get locations and (maybe) other attributes of a referral.
3314  * Note that we'll actually follow the referral later when
3315  * we detect fsid mismatch in inode revalidation
3316  */
3317 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3318                              const struct qstr *name, struct nfs_fattr *fattr,
3319                              struct nfs_fh *fhandle)
3320 {
3321         int status = -ENOMEM;
3322         struct page *page = NULL;
3323         struct nfs4_fs_locations *locations = NULL;
3324
3325         page = alloc_page(GFP_KERNEL);
3326         if (page == NULL)
3327                 goto out;
3328         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3329         if (locations == NULL)
3330                 goto out;
3331
3332         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3333         if (status != 0)
3334                 goto out;
3335
3336         /*
3337          * If the fsid didn't change, this is a migration event, not a
3338          * referral.  Cause us to drop into the exception handler, which
3339          * will kick off migration recovery.
3340          */
3341         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3342                 dprintk("%s: server did not return a different fsid for"
3343                         " a referral at %s\n", __func__, name->name);
3344                 status = -NFS4ERR_MOVED;
3345                 goto out;
3346         }
3347         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3348         nfs_fixup_referral_attributes(&locations->fattr);
3349
3350         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3351         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3352         memset(fhandle, 0, sizeof(struct nfs_fh));
3353 out:
3354         if (page)
3355                 __free_page(page);
3356         kfree(locations);
3357         return status;
3358 }
3359
3360 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3361                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3362 {
3363         struct nfs4_getattr_arg args = {
3364                 .fh = fhandle,
3365                 .bitmask = server->attr_bitmask,
3366         };
3367         struct nfs4_getattr_res res = {
3368                 .fattr = fattr,
3369                 .label = label,
3370                 .server = server,
3371         };
3372         struct rpc_message msg = {
3373                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3374                 .rpc_argp = &args,
3375                 .rpc_resp = &res,
3376         };
3377
3378         args.bitmask = nfs4_bitmask(server, label);
3379
3380         nfs_fattr_init(fattr);
3381         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3382 }
3383
3384 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3385                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3386 {
3387         struct nfs4_exception exception = { };
3388         int err;
3389         do {
3390                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3391                 trace_nfs4_getattr(server, fhandle, fattr, err);
3392                 err = nfs4_handle_exception(server, err,
3393                                 &exception);
3394         } while (exception.retry);
3395         return err;
3396 }
3397
3398 /*
3399  * The file is not closed if it is opened due to the a request to change
3400  * the size of the file. The open call will not be needed once the
3401  * VFS layer lookup-intents are implemented.
3402  *
3403  * Close is called when the inode is destroyed.
3404  * If we haven't opened the file for O_WRONLY, we
3405  * need to in the size_change case to obtain a stateid.
3406  *
3407  * Got race?
3408  * Because OPEN is always done by name in nfsv4, it is
3409  * possible that we opened a different file by the same
3410  * name.  We can recognize this race condition, but we
3411  * can't do anything about it besides returning an error.
3412  *
3413  * This will be fixed with VFS changes (lookup-intent).
3414  */
3415 static int
3416 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3417                   struct iattr *sattr)
3418 {
3419         struct inode *inode = d_inode(dentry);
3420         struct rpc_cred *cred = NULL;
3421         struct nfs4_state *state = NULL;
3422         struct nfs4_label *label = NULL;
3423         int status;
3424
3425         if (pnfs_ld_layoutret_on_setattr(inode) &&
3426             sattr->ia_valid & ATTR_SIZE &&
3427             sattr->ia_size < i_size_read(inode))
3428                 pnfs_commit_and_return_layout(inode);
3429
3430         nfs_fattr_init(fattr);
3431
3432         /* Deal with open(O_TRUNC) */
3433         if (sattr->ia_valid & ATTR_OPEN)
3434                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3435
3436         /* Optimization: if the end result is no change, don't RPC */
3437         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3438                 return 0;
3439
3440         /* Search for an existing open(O_WRITE) file */
3441         if (sattr->ia_valid & ATTR_FILE) {
3442                 struct nfs_open_context *ctx;
3443
3444                 ctx = nfs_file_open_context(sattr->ia_file);
3445                 if (ctx) {
3446                         cred = ctx->cred;
3447                         state = ctx->state;
3448                 }
3449         }
3450
3451         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3452         if (IS_ERR(label))
3453                 return PTR_ERR(label);
3454
3455         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3456         if (status == 0) {
3457                 nfs_setattr_update_inode(inode, sattr, fattr);
3458                 nfs_setsecurity(inode, fattr, label);
3459         }
3460         nfs4_label_free(label);
3461         return status;
3462 }
3463
3464 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3465                 const struct qstr *name, struct nfs_fh *fhandle,
3466                 struct nfs_fattr *fattr, struct nfs4_label *label)
3467 {
3468         struct nfs_server *server = NFS_SERVER(dir);
3469         int                    status;
3470         struct nfs4_lookup_arg args = {
3471                 .bitmask = server->attr_bitmask,
3472                 .dir_fh = NFS_FH(dir),
3473                 .name = name,
3474         };
3475         struct nfs4_lookup_res res = {
3476                 .server = server,
3477                 .fattr = fattr,
3478                 .label = label,
3479                 .fh = fhandle,
3480         };
3481         struct rpc_message msg = {
3482                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3483                 .rpc_argp = &args,
3484                 .rpc_resp = &res,
3485         };
3486
3487         args.bitmask = nfs4_bitmask(server, label);
3488
3489         nfs_fattr_init(fattr);
3490
3491         dprintk("NFS call  lookup %s\n", name->name);
3492         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3493         dprintk("NFS reply lookup: %d\n", status);
3494         return status;
3495 }
3496
3497 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3498 {
3499         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3500                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3501         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3502         fattr->nlink = 2;
3503 }
3504
3505 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3506                                    struct qstr *name, struct nfs_fh *fhandle,
3507                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3508 {
3509         struct nfs4_exception exception = { };
3510         struct rpc_clnt *client = *clnt;
3511         int err;
3512         do {
3513                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3514                 trace_nfs4_lookup(dir, name, err);
3515                 switch (err) {
3516                 case -NFS4ERR_BADNAME:
3517                         err = -ENOENT;
3518                         goto out;
3519                 case -NFS4ERR_MOVED:
3520                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3521                         if (err == -NFS4ERR_MOVED)
3522                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3523                         goto out;
3524                 case -NFS4ERR_WRONGSEC:
3525                         err = -EPERM;
3526                         if (client != *clnt)
3527                                 goto out;
3528                         client = nfs4_negotiate_security(client, dir, name);
3529                         if (IS_ERR(client))
3530                                 return PTR_ERR(client);
3531
3532                         exception.retry = 1;
3533                         break;
3534                 default:
3535                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3536                 }
3537         } while (exception.retry);
3538
3539 out:
3540         if (err == 0)
3541                 *clnt = client;
3542         else if (client != *clnt)
3543                 rpc_shutdown_client(client);
3544
3545         return err;
3546 }
3547
3548 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3549                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3550                             struct nfs4_label *label)
3551 {
3552         int status;
3553         struct rpc_clnt *client = NFS_CLIENT(dir);
3554
3555         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3556         if (client != NFS_CLIENT(dir)) {
3557                 rpc_shutdown_client(client);
3558                 nfs_fixup_secinfo_attributes(fattr);
3559         }
3560         return status;
3561 }
3562
3563 struct rpc_clnt *
3564 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3565                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3566 {
3567         struct rpc_clnt *client = NFS_CLIENT(dir);
3568         int status;
3569
3570         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3571         if (status < 0)
3572                 return ERR_PTR(status);
3573         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3574 }
3575
3576 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3577 {
3578         struct nfs_server *server = NFS_SERVER(inode);
3579         struct nfs4_accessargs args = {
3580                 .fh = NFS_FH(inode),
3581                 .bitmask = server->cache_consistency_bitmask,
3582         };
3583         struct nfs4_accessres res = {
3584                 .server = server,
3585         };
3586         struct rpc_message msg = {
3587                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3588                 .rpc_argp = &args,
3589                 .rpc_resp = &res,
3590                 .rpc_cred = entry->cred,
3591         };
3592         int mode = entry->mask;
3593         int status = 0;
3594
3595         /*
3596          * Determine which access bits we want to ask for...
3597          */
3598         if (mode & MAY_READ)
3599                 args.access |= NFS4_ACCESS_READ;
3600         if (S_ISDIR(inode->i_mode)) {
3601                 if (mode & MAY_WRITE)
3602                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3603                 if (mode & MAY_EXEC)
3604                         args.access |= NFS4_ACCESS_LOOKUP;
3605         } else {
3606                 if (mode & MAY_WRITE)
3607                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3608                 if (mode & MAY_EXEC)
3609                         args.access |= NFS4_ACCESS_EXECUTE;
3610         }
3611
3612         res.fattr = nfs_alloc_fattr();
3613         if (res.fattr == NULL)
3614                 return -ENOMEM;
3615
3616         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3617         if (!status) {
3618                 nfs_access_set_mask(entry, res.access);
3619                 nfs_refresh_inode(inode, res.fattr);
3620         }
3621         nfs_free_fattr(res.fattr);
3622         return status;
3623 }
3624
3625 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3626 {
3627         struct nfs4_exception exception = { };
3628         int err;
3629         do {
3630                 err = _nfs4_proc_access(inode, entry);
3631                 trace_nfs4_access(inode, err);
3632                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3633                                 &exception);
3634         } while (exception.retry);
3635         return err;
3636 }
3637
3638 /*
3639  * TODO: For the time being, we don't try to get any attributes
3640  * along with any of the zero-copy operations READ, READDIR,
3641  * READLINK, WRITE.
3642  *
3643  * In the case of the first three, we want to put the GETATTR
3644  * after the read-type operation -- this is because it is hard
3645  * to predict the length of a GETATTR response in v4, and thus
3646  * align the READ data correctly.  This means that the GETATTR
3647  * may end up partially falling into the page cache, and we should
3648  * shift it into the 'tail' of the xdr_buf before processing.
3649  * To do this efficiently, we need to know the total length
3650  * of data received, which doesn't seem to be available outside
3651  * of the RPC layer.
3652  *
3653  * In the case of WRITE, we also want to put the GETATTR after
3654  * the operation -- in this case because we want to make sure
3655  * we get the post-operation mtime and size.
3656  *
3657  * Both of these changes to the XDR layer would in fact be quite
3658  * minor, but I decided to leave them for a subsequent patch.
3659  */
3660 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3661                 unsigned int pgbase, unsigned int pglen)
3662 {
3663         struct nfs4_readlink args = {
3664                 .fh       = NFS_FH(inode),
3665                 .pgbase   = pgbase,
3666                 .pglen    = pglen,
3667                 .pages    = &page,
3668         };
3669         struct nfs4_readlink_res res;
3670         struct rpc_message msg = {
3671                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3672                 .rpc_argp = &args,
3673                 .rpc_resp = &res,
3674         };
3675
3676         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3677 }
3678
3679 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3680                 unsigned int pgbase, unsigned int pglen)
3681 {
3682         struct nfs4_exception exception = { };
3683         int err;
3684         do {
3685                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3686                 trace_nfs4_readlink(inode, err);
3687                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3688                                 &exception);
3689         } while (exception.retry);
3690         return err;
3691 }
3692
3693 /*
3694  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3695  */
3696 static int
3697 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3698                  int flags)
3699 {
3700         struct nfs4_label l, *ilabel = NULL;
3701         struct nfs_open_context *ctx;
3702         struct nfs4_state *state;
3703         int status = 0;
3704
3705         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3706         if (IS_ERR(ctx))
3707                 return PTR_ERR(ctx);
3708
3709         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3710
3711         sattr->ia_mode &= ~current_umask();
3712         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
3713         if (IS_ERR(state)) {
3714                 status = PTR_ERR(state);
3715                 goto out;
3716         }
3717 out:
3718         nfs4_label_release_security(ilabel);
3719         put_nfs_open_context(ctx);
3720         return status;
3721 }
3722
3723 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3724 {
3725         struct nfs_server *server = NFS_SERVER(dir);
3726         struct nfs_removeargs args = {
3727                 .fh = NFS_FH(dir),
3728                 .name = *name,
3729         };
3730         struct nfs_removeres res = {
3731                 .server = server,
3732         };
3733         struct rpc_message msg = {
3734                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3735                 .rpc_argp = &args,
3736                 .rpc_resp = &res,
3737         };
3738         int status;
3739
3740         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3741         if (status == 0)
3742                 update_changeattr(dir, &res.cinfo);
3743         return status;
3744 }
3745
3746 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3747 {
3748         struct nfs4_exception exception = { };
3749         int err;
3750         do {
3751                 err = _nfs4_proc_remove(dir, name);
3752                 trace_nfs4_remove(dir, name, err);
3753                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3754                                 &exception);
3755         } while (exception.retry);
3756         return err;
3757 }
3758
3759 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3760 {
3761         struct nfs_server *server = NFS_SERVER(dir);
3762         struct nfs_removeargs *args = msg->rpc_argp;
3763         struct nfs_removeres *res = msg->rpc_resp;
3764
3765         res->server = server;
3766         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3767         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3768
3769         nfs_fattr_init(res->dir_attr);
3770 }
3771
3772 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3773 {
3774         nfs4_setup_sequence(NFS_SERVER(data->dir),
3775                         &data->args.seq_args,
3776                         &data->res.seq_res,
3777                         task);
3778 }
3779
3780 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3781 {
3782         struct nfs_unlinkdata *data = task->tk_calldata;
3783         struct nfs_removeres *res = &data->res;
3784
3785         if (!nfs4_sequence_done(task, &res->seq_res))
3786                 return 0;
3787         if (nfs4_async_handle_error(task, res->server, NULL,
3788                                     &data->timeout) == -EAGAIN)
3789                 return 0;
3790         update_changeattr(dir, &res->cinfo);
3791         return 1;
3792 }
3793
3794 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3795 {
3796         struct nfs_server *server = NFS_SERVER(dir);
3797         struct nfs_renameargs *arg = msg->rpc_argp;
3798         struct nfs_renameres *res = msg->rpc_resp;
3799
3800         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3801         res->server = server;
3802         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3803 }
3804
3805 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3806 {
3807         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3808                         &data->args.seq_args,
3809                         &data->res.seq_res,
3810                         task);
3811 }
3812
3813 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3814                                  struct inode *new_dir)
3815 {
3816         struct nfs_renamedata *data = task->tk_calldata;
3817         struct nfs_renameres *res = &data->res;
3818
3819         if (!nfs4_sequence_done(task, &res->seq_res))
3820                 return 0;
3821         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3822                 return 0;
3823
3824         update_changeattr(old_dir, &res->old_cinfo);
3825         update_changeattr(new_dir, &res->new_cinfo);
3826         return 1;
3827 }
3828
3829 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3830 {
3831         struct nfs_server *server = NFS_SERVER(inode);
3832         struct nfs4_link_arg arg = {
3833                 .fh     = NFS_FH(inode),
3834                 .dir_fh = NFS_FH(dir),
3835                 .name   = name,
3836                 .bitmask = server->attr_bitmask,
3837         };
3838         struct nfs4_link_res res = {
3839                 .server = server,
3840                 .label = NULL,
3841         };
3842         struct rpc_message msg = {
3843                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3844                 .rpc_argp = &arg,
3845                 .rpc_resp = &res,
3846         };
3847         int status = -ENOMEM;
3848
3849         res.fattr = nfs_alloc_fattr();
3850         if (res.fattr == NULL)
3851                 goto out;
3852
3853         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3854         if (IS_ERR(res.label)) {
3855                 status = PTR_ERR(res.label);
3856                 goto out;
3857         }
3858         arg.bitmask = nfs4_bitmask(server, res.label);
3859
3860         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3861         if (!status) {
3862                 update_changeattr(dir, &res.cinfo);
3863                 status = nfs_post_op_update_inode(inode, res.fattr);
3864                 if (!status)
3865                         nfs_setsecurity(inode, res.fattr, res.label);
3866         }
3867
3868
3869         nfs4_label_free(res.label);
3870
3871 out:
3872         nfs_free_fattr(res.fattr);
3873         return status;
3874 }
3875
3876 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3877 {
3878         struct nfs4_exception exception = { };
3879         int err;
3880         do {
3881                 err = nfs4_handle_exception(NFS_SERVER(inode),
3882                                 _nfs4_proc_link(inode, dir, name),
3883                                 &exception);
3884         } while (exception.retry);
3885         return err;
3886 }
3887
3888 struct nfs4_createdata {
3889         struct rpc_message msg;
3890         struct nfs4_create_arg arg;
3891         struct nfs4_create_res res;
3892         struct nfs_fh fh;
3893         struct nfs_fattr fattr;
3894         struct nfs4_label *label;
3895 };
3896
3897 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3898                 struct qstr *name, struct iattr *sattr, u32 ftype)
3899 {
3900         struct nfs4_createdata *data;
3901
3902         data = kzalloc(sizeof(*data), GFP_KERNEL);
3903         if (data != NULL) {
3904                 struct nfs_server *server = NFS_SERVER(dir);
3905
3906                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3907                 if (IS_ERR(data->label))
3908                         goto out_free;
3909
3910                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3911                 data->msg.rpc_argp = &data->arg;
3912                 data->msg.rpc_resp = &data->res;
3913                 data->arg.dir_fh = NFS_FH(dir);
3914                 data->arg.server = server;
3915                 data->arg.name = name;
3916                 data->arg.attrs = sattr;
3917                 data->arg.ftype = ftype;
3918                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3919                 data->res.server = server;
3920                 data->res.fh = &data->fh;
3921                 data->res.fattr = &data->fattr;
3922                 data->res.label = data->label;
3923                 nfs_fattr_init(data->res.fattr);
3924         }
3925         return data;
3926 out_free:
3927         kfree(data);
3928         return NULL;
3929 }
3930
3931 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3932 {
3933         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3934                                     &data->arg.seq_args, &data->res.seq_res, 1);
3935         if (status == 0) {
3936                 update_changeattr(dir, &data->res.dir_cinfo);
3937                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3938         }
3939         return status;
3940 }
3941
3942 static void nfs4_free_createdata(struct nfs4_createdata *data)
3943 {
3944         nfs4_label_free(data->label);
3945         kfree(data);
3946 }
3947
3948 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3949                 struct page *page, unsigned int len, struct iattr *sattr,
3950                 struct nfs4_label *label)
3951 {
3952         struct nfs4_createdata *data;
3953         int status = -ENAMETOOLONG;
3954
3955         if (len > NFS4_MAXPATHLEN)
3956                 goto out;
3957
3958         status = -ENOMEM;
3959         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
3960         if (data == NULL)
3961                 goto out;
3962
3963         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
3964         data->arg.u.symlink.pages = &page;
3965         data->arg.u.symlink.len = len;
3966         data->arg.label = label;
3967
3968         status = nfs4_do_create(dir, dentry, data);
3969
3970         nfs4_free_createdata(data);
3971 out:
3972         return status;
3973 }
3974
3975 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3976                 struct page *page, unsigned int len, struct iattr *sattr)
3977 {
3978         struct nfs4_exception exception = { };
3979         struct nfs4_label l, *label = NULL;
3980         int err;
3981
3982         label = nfs4_label_init_security(dir, dentry, sattr, &l);
3983
3984         do {
3985                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
3986                 trace_nfs4_symlink(dir, &dentry->d_name, err);
3987                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3988                                 &exception);
3989         } while (exception.retry);
3990
3991         nfs4_label_release_security(label);
3992         return err;
3993 }
3994
3995 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
3996                 struct iattr *sattr, struct nfs4_label *label)
3997 {
3998         struct nfs4_createdata *data;
3999         int status = -ENOMEM;
4000
4001         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4002         if (data == NULL)
4003                 goto out;
4004
4005         data->arg.label = label;
4006         status = nfs4_do_create(dir, dentry, data);
4007
4008         nfs4_free_createdata(data);
4009 out:
4010         return status;
4011 }
4012
4013 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4014                 struct iattr *sattr)
4015 {
4016         struct nfs4_exception exception = { };
4017         struct nfs4_label l, *label = NULL;
4018         int err;
4019
4020         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4021
4022         sattr->ia_mode &= ~current_umask();
4023         do {
4024                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4025                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4026                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4027                                 &exception);
4028         } while (exception.retry);
4029         nfs4_label_release_security(label);
4030
4031         return err;
4032 }
4033
4034 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4035                 u64 cookie, struct page **pages, unsigned int count, int plus)
4036 {
4037         struct inode            *dir = d_inode(dentry);
4038         struct nfs4_readdir_arg args = {
4039                 .fh = NFS_FH(dir),
4040                 .pages = pages,
4041                 .pgbase = 0,
4042                 .count = count,
4043                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4044                 .plus = plus,
4045         };
4046         struct nfs4_readdir_res res;
4047         struct rpc_message msg = {
4048                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4049                 .rpc_argp = &args,
4050                 .rpc_resp = &res,
4051                 .rpc_cred = cred,
4052         };
4053         int                     status;
4054
4055         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4056                         dentry,
4057                         (unsigned long long)cookie);
4058         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4059         res.pgbase = args.pgbase;
4060         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4061         if (status >= 0) {
4062                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4063                 status += args.pgbase;
4064         }
4065
4066         nfs_invalidate_atime(dir);
4067
4068         dprintk("%s: returns %d\n", __func__, status);
4069         return status;
4070 }
4071
4072 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4073                 u64 cookie, struct page **pages, unsigned int count, int plus)
4074 {
4075         struct nfs4_exception exception = { };
4076         int err;
4077         do {
4078                 err = _nfs4_proc_readdir(dentry, cred, cookie,
4079                                 pages, count, plus);
4080                 trace_nfs4_readdir(d_inode(dentry), err);
4081                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4082                                 &exception);
4083         } while (exception.retry);
4084         return err;
4085 }
4086
4087 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4088                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4089 {
4090         struct nfs4_createdata *data;
4091         int mode = sattr->ia_mode;
4092         int status = -ENOMEM;
4093
4094         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
4095         if (data == NULL)
4096                 goto out;
4097
4098         if (S_ISFIFO(mode))
4099                 data->arg.ftype = NF4FIFO;
4100         else if (S_ISBLK(mode)) {
4101                 data->arg.ftype = NF4BLK;
4102                 data->arg.u.device.specdata1 = MAJOR(rdev);
4103                 data->arg.u.device.specdata2 = MINOR(rdev);
4104         }
4105         else if (S_ISCHR(mode)) {
4106                 data->arg.ftype = NF4CHR;
4107                 data->arg.u.device.specdata1 = MAJOR(rdev);
4108                 data->arg.u.device.specdata2 = MINOR(rdev);
4109         } else if (!S_ISSOCK(mode)) {
4110                 status = -EINVAL;
4111                 goto out_free;
4112         }
4113
4114         data->arg.label = label;
4115         status = nfs4_do_create(dir, dentry, data);
4116 out_free:
4117         nfs4_free_createdata(data);
4118 out:
4119         return status;
4120 }
4121
4122 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4123                 struct iattr *sattr, dev_t rdev)
4124 {
4125         struct nfs4_exception exception = { };
4126         struct nfs4_label l, *label = NULL;
4127         int err;
4128
4129         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4130
4131         sattr->ia_mode &= ~current_umask();
4132         do {
4133                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4134                 trace_nfs4_mknod(dir, &dentry->d_name, err);
4135                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4136                                 &exception);
4137         } while (exception.retry);
4138
4139         nfs4_label_release_security(label);
4140
4141         return err;
4142 }
4143
4144 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
4145                  struct nfs_fsstat *fsstat)
4146 {
4147         struct nfs4_statfs_arg args = {
4148                 .fh = fhandle,
4149                 .bitmask = server->attr_bitmask,
4150         };
4151         struct nfs4_statfs_res res = {
4152                 .fsstat = fsstat,
4153         };
4154         struct rpc_message msg = {
4155                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
4156                 .rpc_argp = &args,
4157                 .rpc_resp = &res,
4158         };
4159
4160         nfs_fattr_init(fsstat->fattr);
4161         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4162 }
4163
4164 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4165 {
4166         struct nfs4_exception exception = { };
4167         int err;
4168         do {
4169                 err = nfs4_handle_exception(server,
4170                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4171                                 &exception);
4172         } while (exception.retry);
4173         return err;
4174 }
4175
4176 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4177                 struct nfs_fsinfo *fsinfo)
4178 {
4179         struct nfs4_fsinfo_arg args = {
4180                 .fh = fhandle,
4181                 .bitmask = server->attr_bitmask,
4182         };
4183         struct nfs4_fsinfo_res res = {
4184                 .fsinfo = fsinfo,
4185         };
4186         struct rpc_message msg = {
4187                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4188                 .rpc_argp = &args,
4189                 .rpc_resp = &res,
4190         };
4191
4192         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4193 }
4194
4195 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4196 {
4197         struct nfs4_exception exception = { };
4198         unsigned long now = jiffies;
4199         int err;
4200
4201         do {
4202                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4203                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4204                 if (err == 0) {
4205                         struct nfs_client *clp = server->nfs_client;
4206
4207                         spin_lock(&clp->cl_lock);
4208                         clp->cl_lease_time = fsinfo->lease_time * HZ;
4209                         clp->cl_last_renewal = now;
4210                         spin_unlock(&clp->cl_lock);
4211                         break;
4212                 }
4213                 err = nfs4_handle_exception(server, err, &exception);
4214         } while (exception.retry);
4215         return err;
4216 }
4217
4218 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4219 {
4220         int error;
4221
4222         nfs_fattr_init(fsinfo->fattr);
4223         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4224         if (error == 0) {
4225                 /* block layout checks this! */
4226                 server->pnfs_blksize = fsinfo->blksize;
4227                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4228         }
4229
4230         return error;
4231 }
4232
4233 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4234                 struct nfs_pathconf *pathconf)
4235 {
4236         struct nfs4_pathconf_arg args = {
4237                 .fh = fhandle,
4238                 .bitmask = server->attr_bitmask,
4239         };
4240         struct nfs4_pathconf_res res = {
4241                 .pathconf = pathconf,
4242         };
4243         struct rpc_message msg = {
4244                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4245                 .rpc_argp = &args,
4246                 .rpc_resp = &res,
4247         };
4248
4249         /* None of the pathconf attributes are mandatory to implement */
4250         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4251                 memset(pathconf, 0, sizeof(*pathconf));
4252                 return 0;
4253         }
4254
4255         nfs_fattr_init(pathconf->fattr);
4256         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4257 }
4258
4259 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4260                 struct nfs_pathconf *pathconf)
4261 {
4262         struct nfs4_exception exception = { };
4263         int err;
4264
4265         do {
4266                 err = nfs4_handle_exception(server,
4267                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4268                                 &exception);
4269         } while (exception.retry);
4270         return err;
4271 }
4272
4273 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4274                 const struct nfs_open_context *ctx,
4275                 const struct nfs_lock_context *l_ctx,
4276                 fmode_t fmode)
4277 {
4278         const struct nfs_lockowner *lockowner = NULL;
4279
4280         if (l_ctx != NULL)
4281                 lockowner = &l_ctx->lockowner;
4282         return nfs4_select_rw_stateid(stateid, ctx->state, fmode, lockowner);
4283 }
4284 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4285
4286 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4287                 const struct nfs_open_context *ctx,
4288                 const struct nfs_lock_context *l_ctx,
4289                 fmode_t fmode)
4290 {
4291         nfs4_stateid current_stateid;
4292
4293         /* If the current stateid represents a lost lock, then exit */
4294         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4295                 return true;
4296         return nfs4_stateid_match(stateid, &current_stateid);
4297 }
4298
4299 static bool nfs4_error_stateid_expired(int err)
4300 {
4301         switch (err) {
4302         case -NFS4ERR_DELEG_REVOKED:
4303         case -NFS4ERR_ADMIN_REVOKED:
4304         case -NFS4ERR_BAD_STATEID:
4305         case -NFS4ERR_STALE_STATEID:
4306         case -NFS4ERR_OLD_STATEID:
4307         case -NFS4ERR_OPENMODE:
4308         case -NFS4ERR_EXPIRED:
4309                 return true;
4310         }
4311         return false;
4312 }
4313
4314 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4315 {
4316         nfs_invalidate_atime(hdr->inode);
4317 }
4318
4319 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4320 {
4321         struct nfs_server *server = NFS_SERVER(hdr->inode);
4322
4323         trace_nfs4_read(hdr, task->tk_status);
4324         if (nfs4_async_handle_error(task, server,
4325                                     hdr->args.context->state,
4326                                     NULL) == -EAGAIN) {
4327                 rpc_restart_call_prepare(task);
4328                 return -EAGAIN;
4329         }
4330
4331         __nfs4_read_done_cb(hdr);
4332         if (task->tk_status > 0)
4333                 renew_lease(server, hdr->timestamp);
4334         return 0;
4335 }
4336
4337 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4338                 struct nfs_pgio_args *args)
4339 {
4340
4341         if (!nfs4_error_stateid_expired(task->tk_status) ||
4342                 nfs4_stateid_is_current(&args->stateid,
4343                                 args->context,
4344                                 args->lock_context,
4345                                 FMODE_READ))
4346                 return false;
4347         rpc_restart_call_prepare(task);
4348         return true;
4349 }
4350
4351 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4352 {
4353
4354         dprintk("--> %s\n", __func__);
4355
4356         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4357                 return -EAGAIN;
4358         if (nfs4_read_stateid_changed(task, &hdr->args))
4359                 return -EAGAIN;
4360         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4361                                     nfs4_read_done_cb(task, hdr);
4362 }
4363
4364 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4365                                  struct rpc_message *msg)
4366 {
4367         hdr->timestamp   = jiffies;
4368         hdr->pgio_done_cb = nfs4_read_done_cb;
4369         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4370         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4371 }
4372
4373 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4374                                       struct nfs_pgio_header *hdr)
4375 {
4376         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4377                         &hdr->args.seq_args,
4378                         &hdr->res.seq_res,
4379                         task))
4380                 return 0;
4381         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4382                                 hdr->args.lock_context,
4383                                 hdr->rw_ops->rw_mode) == -EIO)
4384                 return -EIO;
4385         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4386                 return -EIO;
4387         return 0;
4388 }
4389
4390 static int nfs4_write_done_cb(struct rpc_task *task,
4391                               struct nfs_pgio_header *hdr)
4392 {
4393         struct inode *inode = hdr->inode;
4394
4395         trace_nfs4_write(hdr, task->tk_status);
4396         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4397                                     hdr->args.context->state,
4398                                     NULL) == -EAGAIN) {
4399                 rpc_restart_call_prepare(task);
4400                 return -EAGAIN;
4401         }
4402         if (task->tk_status >= 0) {
4403                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4404                 nfs_writeback_update_inode(hdr);
4405         }
4406         return 0;
4407 }
4408
4409 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4410                 struct nfs_pgio_args *args)
4411 {
4412
4413         if (!nfs4_error_stateid_expired(task->tk_status) ||
4414                 nfs4_stateid_is_current(&args->stateid,
4415                                 args->context,
4416                                 args->lock_context,
4417                                 FMODE_WRITE))
4418                 return false;
4419         rpc_restart_call_prepare(task);
4420         return true;
4421 }
4422
4423 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4424 {
4425         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4426                 return -EAGAIN;
4427         if (nfs4_write_stateid_changed(task, &hdr->args))
4428                 return -EAGAIN;
4429         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4430                 nfs4_write_done_cb(task, hdr);
4431 }
4432
4433 static
4434 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4435 {
4436         /* Don't request attributes for pNFS or O_DIRECT writes */
4437         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4438                 return false;
4439         /* Otherwise, request attributes if and only if we don't hold
4440          * a delegation
4441          */
4442         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4443 }
4444
4445 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4446                                   struct rpc_message *msg)
4447 {
4448         struct nfs_server *server = NFS_SERVER(hdr->inode);
4449
4450         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4451                 hdr->args.bitmask = NULL;
4452                 hdr->res.fattr = NULL;
4453         } else
4454                 hdr->args.bitmask = server->cache_consistency_bitmask;
4455
4456         if (!hdr->pgio_done_cb)
4457                 hdr->pgio_done_cb = nfs4_write_done_cb;
4458         hdr->res.server = server;
4459         hdr->timestamp   = jiffies;
4460
4461         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4462         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4463 }
4464
4465 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4466 {
4467         nfs4_setup_sequence(NFS_SERVER(data->inode),
4468                         &data->args.seq_args,
4469                         &data->res.seq_res,
4470                         task);
4471 }
4472
4473 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4474 {
4475         struct inode *inode = data->inode;
4476
4477         trace_nfs4_commit(data, task->tk_status);
4478         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4479                                     NULL, NULL) == -EAGAIN) {
4480                 rpc_restart_call_prepare(task);
4481                 return -EAGAIN;
4482         }
4483         return 0;
4484 }
4485
4486 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4487 {
4488         if (!nfs4_sequence_done(task, &data->res.seq_res))
4489                 return -EAGAIN;
4490         return data->commit_done_cb(task, data);
4491 }
4492
4493 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4494 {
4495         struct nfs_server *server = NFS_SERVER(data->inode);
4496
4497         if (data->commit_done_cb == NULL)
4498                 data->commit_done_cb = nfs4_commit_done_cb;
4499         data->res.server = server;
4500         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4501         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4502 }
4503
4504 struct nfs4_renewdata {
4505         struct nfs_client       *client;
4506         unsigned long           timestamp;
4507 };
4508
4509 /*
4510  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4511  * standalone procedure for queueing an asynchronous RENEW.
4512  */
4513 static void nfs4_renew_release(void *calldata)
4514 {
4515         struct nfs4_renewdata *data = calldata;
4516         struct nfs_client *clp = data->client;
4517
4518         if (atomic_read(&clp->cl_count) > 1)
4519                 nfs4_schedule_state_renewal(clp);
4520         nfs_put_client(clp);
4521         kfree(data);
4522 }
4523
4524 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4525 {
4526         struct nfs4_renewdata *data = calldata;
4527         struct nfs_client *clp = data->client;
4528         unsigned long timestamp = data->timestamp;
4529
4530         trace_nfs4_renew_async(clp, task->tk_status);
4531         switch (task->tk_status) {
4532         case 0:
4533                 break;
4534         case -NFS4ERR_LEASE_MOVED:
4535                 nfs4_schedule_lease_moved_recovery(clp);
4536                 break;
4537         default:
4538                 /* Unless we're shutting down, schedule state recovery! */
4539                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4540                         return;
4541                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4542                         nfs4_schedule_lease_recovery(clp);
4543                         return;
4544                 }
4545                 nfs4_schedule_path_down_recovery(clp);
4546         }
4547         do_renew_lease(clp, timestamp);
4548 }
4549
4550 static const struct rpc_call_ops nfs4_renew_ops = {
4551         .rpc_call_done = nfs4_renew_done,
4552         .rpc_release = nfs4_renew_release,
4553 };
4554
4555 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4556 {
4557         struct rpc_message msg = {
4558                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4559                 .rpc_argp       = clp,
4560                 .rpc_cred       = cred,
4561         };
4562         struct nfs4_renewdata *data;
4563
4564         if (renew_flags == 0)
4565                 return 0;
4566         if (!atomic_inc_not_zero(&clp->cl_count))
4567                 return -EIO;
4568         data = kmalloc(sizeof(*data), GFP_NOFS);
4569         if (data == NULL)
4570                 return -ENOMEM;
4571         data->client = clp;
4572         data->timestamp = jiffies;
4573         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4574                         &nfs4_renew_ops, data);
4575 }
4576
4577 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4578 {
4579         struct rpc_message msg = {
4580                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4581                 .rpc_argp       = clp,
4582                 .rpc_cred       = cred,
4583         };
4584         unsigned long now = jiffies;
4585         int status;
4586
4587         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4588         if (status < 0)
4589                 return status;
4590         do_renew_lease(clp, now);
4591         return 0;
4592 }
4593
4594 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4595 {
4596         return server->caps & NFS_CAP_ACLS;
4597 }
4598
4599 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4600  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4601  * the stack.
4602  */
4603 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4604
4605 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4606                 struct page **pages)
4607 {
4608         struct page *newpage, **spages;
4609         int rc = 0;
4610         size_t len;
4611         spages = pages;
4612
4613         do {
4614                 len = min_t(size_t, PAGE_SIZE, buflen);
4615                 newpage = alloc_page(GFP_KERNEL);
4616
4617                 if (newpage == NULL)
4618                         goto unwind;
4619                 memcpy(page_address(newpage), buf, len);
4620                 buf += len;
4621                 buflen -= len;
4622                 *pages++ = newpage;
4623                 rc++;
4624         } while (buflen != 0);
4625
4626         return rc;
4627
4628 unwind:
4629         for(; rc > 0; rc--)
4630                 __free_page(spages[rc-1]);
4631         return -ENOMEM;
4632 }
4633
4634 struct nfs4_cached_acl {
4635         int cached;
4636         size_t len;
4637         char data[0];
4638 };
4639
4640 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4641 {
4642         struct nfs_inode *nfsi = NFS_I(inode);
4643
4644         spin_lock(&inode->i_lock);
4645         kfree(nfsi->nfs4_acl);
4646         nfsi->nfs4_acl = acl;
4647         spin_unlock(&inode->i_lock);
4648 }
4649
4650 static void nfs4_zap_acl_attr(struct inode *inode)
4651 {
4652         nfs4_set_cached_acl(inode, NULL);
4653 }
4654
4655 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4656 {
4657         struct nfs_inode *nfsi = NFS_I(inode);
4658         struct nfs4_cached_acl *acl;
4659         int ret = -ENOENT;
4660
4661         spin_lock(&inode->i_lock);
4662         acl = nfsi->nfs4_acl;
4663         if (acl == NULL)
4664                 goto out;
4665         if (buf == NULL) /* user is just asking for length */
4666                 goto out_len;
4667         if (acl->cached == 0)
4668                 goto out;
4669         ret = -ERANGE; /* see getxattr(2) man page */
4670         if (acl->len > buflen)
4671                 goto out;
4672         memcpy(buf, acl->data, acl->len);
4673 out_len:
4674         ret = acl->len;
4675 out:
4676         spin_unlock(&inode->i_lock);
4677         return ret;
4678 }
4679
4680 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4681 {
4682         struct nfs4_cached_acl *acl;
4683         size_t buflen = sizeof(*acl) + acl_len;
4684
4685         if (buflen <= PAGE_SIZE) {
4686                 acl = kmalloc(buflen, GFP_KERNEL);
4687                 if (acl == NULL)
4688                         goto out;
4689                 acl->cached = 1;
4690                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4691         } else {
4692                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4693                 if (acl == NULL)
4694                         goto out;
4695                 acl->cached = 0;
4696         }
4697         acl->len = acl_len;
4698 out:
4699         nfs4_set_cached_acl(inode, acl);
4700 }
4701
4702 /*
4703  * The getxattr API returns the required buffer length when called with a
4704  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4705  * the required buf.  On a NULL buf, we send a page of data to the server
4706  * guessing that the ACL request can be serviced by a page. If so, we cache
4707  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4708  * the cache. If not so, we throw away the page, and cache the required
4709  * length. The next getxattr call will then produce another round trip to
4710  * the server, this time with the input buf of the required size.
4711  */
4712 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4713 {
4714         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4715         struct nfs_getaclargs args = {
4716                 .fh = NFS_FH(inode),
4717                 .acl_pages = pages,
4718                 .acl_len = buflen,
4719         };
4720         struct nfs_getaclres res = {
4721                 .acl_len = buflen,
4722         };
4723         struct rpc_message msg = {
4724                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4725                 .rpc_argp = &args,
4726                 .rpc_resp = &res,
4727         };
4728         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4729         int ret = -ENOMEM, i;
4730
4731         /* As long as we're doing a round trip to the server anyway,
4732          * let's be prepared for a page of acl data. */
4733         if (npages == 0)
4734                 npages = 1;
4735         if (npages > ARRAY_SIZE(pages))
4736                 return -ERANGE;
4737
4738         for (i = 0; i < npages; i++) {
4739                 pages[i] = alloc_page(GFP_KERNEL);
4740                 if (!pages[i])
4741                         goto out_free;
4742         }
4743
4744         /* for decoding across pages */
4745         res.acl_scratch = alloc_page(GFP_KERNEL);
4746         if (!res.acl_scratch)
4747                 goto out_free;
4748
4749         args.acl_len = npages * PAGE_SIZE;
4750
4751         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4752                 __func__, buf, buflen, npages, args.acl_len);
4753         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4754                              &msg, &args.seq_args, &res.seq_res, 0);
4755         if (ret)
4756                 goto out_free;
4757
4758         /* Handle the case where the passed-in buffer is too short */
4759         if (res.acl_flags & NFS4_ACL_TRUNC) {
4760                 /* Did the user only issue a request for the acl length? */
4761                 if (buf == NULL)
4762                         goto out_ok;
4763                 ret = -ERANGE;
4764                 goto out_free;
4765         }
4766         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4767         if (buf) {
4768                 if (res.acl_len > buflen) {
4769                         ret = -ERANGE;
4770                         goto out_free;
4771                 }
4772                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4773         }
4774 out_ok:
4775         ret = res.acl_len;
4776 out_free:
4777         for (i = 0; i < npages; i++)
4778                 if (pages[i])
4779                         __free_page(pages[i]);
4780         if (res.acl_scratch)
4781                 __free_page(res.acl_scratch);
4782         return ret;
4783 }
4784
4785 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4786 {
4787         struct nfs4_exception exception = { };
4788         ssize_t ret;
4789         do {
4790                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4791                 trace_nfs4_get_acl(inode, ret);
4792                 if (ret >= 0)
4793                         break;
4794                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4795         } while (exception.retry);
4796         return ret;
4797 }
4798
4799 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4800 {
4801         struct nfs_server *server = NFS_SERVER(inode);
4802         int ret;
4803
4804         if (!nfs4_server_supports_acls(server))
4805                 return -EOPNOTSUPP;
4806         ret = nfs_revalidate_inode(server, inode);
4807         if (ret < 0)
4808                 return ret;
4809         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4810                 nfs_zap_acl_cache(inode);
4811         ret = nfs4_read_cached_acl(inode, buf, buflen);
4812         if (ret != -ENOENT)
4813                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4814                  * but no cached acl data, just the acl length */
4815                 return ret;
4816         return nfs4_get_acl_uncached(inode, buf, buflen);
4817 }
4818
4819 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4820 {
4821         struct nfs_server *server = NFS_SERVER(inode);
4822         struct page *pages[NFS4ACL_MAXPAGES];
4823         struct nfs_setaclargs arg = {
4824                 .fh             = NFS_FH(inode),
4825                 .acl_pages      = pages,
4826                 .acl_len        = buflen,
4827         };
4828         struct nfs_setaclres res;
4829         struct rpc_message msg = {
4830                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4831                 .rpc_argp       = &arg,
4832                 .rpc_resp       = &res,
4833         };
4834         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4835         int ret, i;
4836
4837         if (!nfs4_server_supports_acls(server))
4838                 return -EOPNOTSUPP;
4839         if (npages > ARRAY_SIZE(pages))
4840                 return -ERANGE;
4841         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
4842         if (i < 0)
4843                 return i;
4844         nfs4_inode_return_delegation(inode);
4845         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4846
4847         /*
4848          * Free each page after tx, so the only ref left is
4849          * held by the network stack
4850          */
4851         for (; i > 0; i--)
4852                 put_page(pages[i-1]);
4853
4854         /*
4855          * Acl update can result in inode attribute update.
4856          * so mark the attribute cache invalid.
4857          */
4858         spin_lock(&inode->i_lock);
4859         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4860         spin_unlock(&inode->i_lock);
4861         nfs_access_zap_cache(inode);
4862         nfs_zap_acl_cache(inode);
4863         return ret;
4864 }
4865
4866 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4867 {
4868         struct nfs4_exception exception = { };
4869         int err;
4870         do {
4871                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4872                 trace_nfs4_set_acl(inode, err);
4873                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4874                                 &exception);
4875         } while (exception.retry);
4876         return err;
4877 }
4878
4879 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4880 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4881                                         size_t buflen)
4882 {
4883         struct nfs_server *server = NFS_SERVER(inode);
4884         struct nfs_fattr fattr;
4885         struct nfs4_label label = {0, 0, buflen, buf};
4886
4887         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4888         struct nfs4_getattr_arg arg = {
4889                 .fh             = NFS_FH(inode),
4890                 .bitmask        = bitmask,
4891         };
4892         struct nfs4_getattr_res res = {
4893                 .fattr          = &fattr,
4894                 .label          = &label,
4895                 .server         = server,
4896         };
4897         struct rpc_message msg = {
4898                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4899                 .rpc_argp       = &arg,
4900                 .rpc_resp       = &res,
4901         };
4902         int ret;
4903
4904         nfs_fattr_init(&fattr);
4905
4906         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4907         if (ret)
4908                 return ret;
4909         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4910                 return -ENOENT;
4911         if (buflen < label.len)
4912                 return -ERANGE;
4913         return 0;
4914 }
4915
4916 static int nfs4_get_security_label(struct inode *inode, void *buf,
4917                                         size_t buflen)
4918 {
4919         struct nfs4_exception exception = { };
4920         int err;
4921
4922         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4923                 return -EOPNOTSUPP;
4924
4925         do {
4926                 err = _nfs4_get_security_label(inode, buf, buflen);
4927                 trace_nfs4_get_security_label(inode, err);
4928                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4929                                 &exception);
4930         } while (exception.retry);
4931         return err;
4932 }
4933
4934 static int _nfs4_do_set_security_label(struct inode *inode,
4935                 struct nfs4_label *ilabel,
4936                 struct nfs_fattr *fattr,
4937                 struct nfs4_label *olabel)
4938 {
4939
4940         struct iattr sattr = {0};
4941         struct nfs_server *server = NFS_SERVER(inode);
4942         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4943         struct nfs_setattrargs arg = {
4944                 .fh             = NFS_FH(inode),
4945                 .iap            = &sattr,
4946                 .server         = server,
4947                 .bitmask        = bitmask,
4948                 .label          = ilabel,
4949         };
4950         struct nfs_setattrres res = {
4951                 .fattr          = fattr,
4952                 .label          = olabel,
4953                 .server         = server,
4954         };
4955         struct rpc_message msg = {
4956                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4957                 .rpc_argp       = &arg,
4958                 .rpc_resp       = &res,
4959         };
4960         int status;
4961
4962         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
4963
4964         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4965         if (status)
4966                 dprintk("%s failed: %d\n", __func__, status);
4967
4968         return status;
4969 }
4970
4971 static int nfs4_do_set_security_label(struct inode *inode,
4972                 struct nfs4_label *ilabel,
4973                 struct nfs_fattr *fattr,
4974                 struct nfs4_label *olabel)
4975 {
4976         struct nfs4_exception exception = { };
4977         int err;
4978
4979         do {
4980                 err = _nfs4_do_set_security_label(inode, ilabel,
4981                                 fattr, olabel);
4982                 trace_nfs4_set_security_label(inode, err);
4983                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4984                                 &exception);
4985         } while (exception.retry);
4986         return err;
4987 }
4988
4989 static int
4990 nfs4_set_security_label(struct dentry *dentry, const void *buf, size_t buflen)
4991 {
4992         struct nfs4_label ilabel, *olabel = NULL;
4993         struct nfs_fattr fattr;
4994         struct rpc_cred *cred;
4995         struct inode *inode = d_inode(dentry);
4996         int status;
4997
4998         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4999                 return -EOPNOTSUPP;
5000
5001         nfs_fattr_init(&fattr);
5002
5003         ilabel.pi = 0;
5004         ilabel.lfs = 0;
5005         ilabel.label = (char *)buf;
5006         ilabel.len = buflen;
5007
5008         cred = rpc_lookup_cred();
5009         if (IS_ERR(cred))
5010                 return PTR_ERR(cred);
5011
5012         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5013         if (IS_ERR(olabel)) {
5014                 status = -PTR_ERR(olabel);
5015                 goto out;
5016         }
5017
5018         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5019         if (status == 0)
5020                 nfs_setsecurity(inode, &fattr, olabel);
5021
5022         nfs4_label_free(olabel);
5023 out:
5024         put_rpccred(cred);
5025         return status;
5026 }
5027 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
5028
5029
5030 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5031                                     nfs4_verifier *bootverf)
5032 {
5033         __be32 verf[2];
5034
5035         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5036                 /* An impossible timestamp guarantees this value
5037                  * will never match a generated boot time. */
5038                 verf[0] = 0;
5039                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
5040         } else {
5041                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5042                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
5043                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
5044         }
5045         memcpy(bootverf->data, verf, sizeof(bootverf->data));
5046 }
5047
5048 static int
5049 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
5050 {
5051         int result;
5052         size_t len;
5053         char *str;
5054
5055         if (clp->cl_owner_id != NULL)
5056                 return 0;
5057
5058         rcu_read_lock();
5059         len = 14 + strlen(clp->cl_ipaddr) + 1 +
5060                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5061                 1 +
5062                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) +
5063                 1;
5064         rcu_read_unlock();
5065
5066         if (len > NFS4_OPAQUE_LIMIT + 1)
5067                 return -EINVAL;
5068
5069         /*
5070          * Since this string is allocated at mount time, and held until the
5071          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5072          * about a memory-reclaim deadlock.
5073          */
5074         str = kmalloc(len, GFP_KERNEL);
5075         if (!str)
5076                 return -ENOMEM;
5077
5078         rcu_read_lock();
5079         result = scnprintf(str, len, "Linux NFSv4.0 %s/%s %s",
5080                         clp->cl_ipaddr,
5081                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
5082                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO));
5083         rcu_read_unlock();
5084
5085         clp->cl_owner_id = str;
5086         return 0;
5087 }
5088
5089 static int
5090 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
5091 {
5092         int result;
5093         size_t len;
5094         char *str;
5095
5096         len = 10 + 10 + 1 + 10 + 1 +
5097                 strlen(nfs4_client_id_uniquifier) + 1 +
5098                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5099
5100         if (len > NFS4_OPAQUE_LIMIT + 1)
5101                 return -EINVAL;
5102
5103         /*
5104          * Since this string is allocated at mount time, and held until the
5105          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5106          * about a memory-reclaim deadlock.
5107          */
5108         str = kmalloc(len, GFP_KERNEL);
5109         if (!str)
5110                 return -ENOMEM;
5111
5112         result = scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
5113                         clp->rpc_ops->version, clp->cl_minorversion,
5114                         nfs4_client_id_uniquifier,
5115                         clp->cl_rpcclient->cl_nodename);
5116         clp->cl_owner_id = str;
5117         return 0;
5118 }
5119
5120 static int
5121 nfs4_init_uniform_client_string(struct nfs_client *clp)
5122 {
5123         int result;
5124         size_t len;
5125         char *str;
5126
5127         if (clp->cl_owner_id != NULL)
5128                 return 0;
5129
5130         if (nfs4_client_id_uniquifier[0] != '\0')
5131                 return nfs4_init_uniquifier_client_string(clp);
5132
5133         len = 10 + 10 + 1 + 10 + 1 +
5134                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5135
5136         if (len > NFS4_OPAQUE_LIMIT + 1)
5137                 return -EINVAL;
5138
5139         /*
5140          * Since this string is allocated at mount time, and held until the
5141          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5142          * about a memory-reclaim deadlock.
5143          */
5144         str = kmalloc(len, GFP_KERNEL);
5145         if (!str)
5146                 return -ENOMEM;
5147
5148         result = scnprintf(str, len, "Linux NFSv%u.%u %s",
5149                         clp->rpc_ops->version, clp->cl_minorversion,
5150                         clp->cl_rpcclient->cl_nodename);
5151         clp->cl_owner_id = str;
5152         return 0;
5153 }
5154
5155 /*
5156  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5157  * services.  Advertise one based on the address family of the
5158  * clientaddr.
5159  */
5160 static unsigned int
5161 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5162 {
5163         if (strchr(clp->cl_ipaddr, ':') != NULL)
5164                 return scnprintf(buf, len, "tcp6");
5165         else
5166                 return scnprintf(buf, len, "tcp");
5167 }
5168
5169 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5170 {
5171         struct nfs4_setclientid *sc = calldata;
5172
5173         if (task->tk_status == 0)
5174                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5175 }
5176
5177 static const struct rpc_call_ops nfs4_setclientid_ops = {
5178         .rpc_call_done = nfs4_setclientid_done,
5179 };
5180
5181 /**
5182  * nfs4_proc_setclientid - Negotiate client ID
5183  * @clp: state data structure
5184  * @program: RPC program for NFSv4 callback service
5185  * @port: IP port number for NFS4 callback service
5186  * @cred: RPC credential to use for this call
5187  * @res: where to place the result
5188  *
5189  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5190  */
5191 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5192                 unsigned short port, struct rpc_cred *cred,
5193                 struct nfs4_setclientid_res *res)
5194 {
5195         nfs4_verifier sc_verifier;
5196         struct nfs4_setclientid setclientid = {
5197                 .sc_verifier = &sc_verifier,
5198                 .sc_prog = program,
5199                 .sc_clnt = clp,
5200         };
5201         struct rpc_message msg = {
5202                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5203                 .rpc_argp = &setclientid,
5204                 .rpc_resp = res,
5205                 .rpc_cred = cred,
5206         };
5207         struct rpc_task *task;
5208         struct rpc_task_setup task_setup_data = {
5209                 .rpc_client = clp->cl_rpcclient,
5210                 .rpc_message = &msg,
5211                 .callback_ops = &nfs4_setclientid_ops,
5212                 .callback_data = &setclientid,
5213                 .flags = RPC_TASK_TIMEOUT,
5214         };
5215         int status;
5216
5217         /* nfs_client_id4 */
5218         nfs4_init_boot_verifier(clp, &sc_verifier);
5219
5220         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5221                 status = nfs4_init_uniform_client_string(clp);
5222         else
5223                 status = nfs4_init_nonuniform_client_string(clp);
5224
5225         if (status)
5226                 goto out;
5227
5228         /* cb_client4 */
5229         setclientid.sc_netid_len =
5230                                 nfs4_init_callback_netid(clp,
5231                                                 setclientid.sc_netid,
5232                                                 sizeof(setclientid.sc_netid));
5233         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5234                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5235                                 clp->cl_ipaddr, port >> 8, port & 255);
5236
5237         dprintk("NFS call  setclientid auth=%s, '%s'\n",
5238                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5239                 clp->cl_owner_id);
5240         task = rpc_run_task(&task_setup_data);
5241         if (IS_ERR(task)) {
5242                 status = PTR_ERR(task);
5243                 goto out;
5244         }
5245         status = task->tk_status;
5246         if (setclientid.sc_cred) {
5247                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5248                 put_rpccred(setclientid.sc_cred);
5249         }
5250         rpc_put_task(task);
5251 out:
5252         trace_nfs4_setclientid(clp, status);
5253         dprintk("NFS reply setclientid: %d\n", status);
5254         return status;
5255 }
5256
5257 /**
5258  * nfs4_proc_setclientid_confirm - Confirm client ID
5259  * @clp: state data structure
5260  * @res: result of a previous SETCLIENTID
5261  * @cred: RPC credential to use for this call
5262  *
5263  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5264  */
5265 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5266                 struct nfs4_setclientid_res *arg,
5267                 struct rpc_cred *cred)
5268 {
5269         struct rpc_message msg = {
5270                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5271                 .rpc_argp = arg,
5272                 .rpc_cred = cred,
5273         };
5274         int status;
5275
5276         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5277                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5278                 clp->cl_clientid);
5279         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5280         trace_nfs4_setclientid_confirm(clp, status);
5281         dprintk("NFS reply setclientid_confirm: %d\n", status);
5282         return status;
5283 }
5284
5285 struct nfs4_delegreturndata {
5286         struct nfs4_delegreturnargs args;
5287         struct nfs4_delegreturnres res;
5288         struct nfs_fh fh;
5289         nfs4_stateid stateid;
5290         unsigned long timestamp;
5291         struct nfs_fattr fattr;
5292         int rpc_status;
5293         struct inode *inode;
5294         bool roc;
5295         u32 roc_barrier;
5296 };
5297
5298 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5299 {
5300         struct nfs4_delegreturndata *data = calldata;
5301
5302         if (!nfs4_sequence_done(task, &data->res.seq_res))
5303                 return;
5304
5305         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5306         switch (task->tk_status) {
5307         case 0:
5308                 renew_lease(data->res.server, data->timestamp);
5309         case -NFS4ERR_ADMIN_REVOKED:
5310         case -NFS4ERR_DELEG_REVOKED:
5311         case -NFS4ERR_BAD_STATEID:
5312         case -NFS4ERR_OLD_STATEID:
5313         case -NFS4ERR_STALE_STATEID:
5314         case -NFS4ERR_EXPIRED:
5315                 task->tk_status = 0;
5316                 if (data->roc)
5317                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5318                 break;
5319         default:
5320                 if (nfs4_async_handle_error(task, data->res.server,
5321                                             NULL, NULL) == -EAGAIN) {
5322                         rpc_restart_call_prepare(task);
5323                         return;
5324                 }
5325         }
5326         data->rpc_status = task->tk_status;
5327 }
5328
5329 static void nfs4_delegreturn_release(void *calldata)
5330 {
5331         struct nfs4_delegreturndata *data = calldata;
5332         struct inode *inode = data->inode;
5333
5334         if (inode) {
5335                 if (data->roc)
5336                         pnfs_roc_release(inode);
5337                 nfs_iput_and_deactive(inode);
5338         }
5339         kfree(calldata);
5340 }
5341
5342 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5343 {
5344         struct nfs4_delegreturndata *d_data;
5345
5346         d_data = (struct nfs4_delegreturndata *)data;
5347
5348         if (nfs4_wait_on_layoutreturn(d_data->inode, task))
5349                 return;
5350
5351         if (d_data->roc)
5352                 pnfs_roc_get_barrier(d_data->inode, &d_data->roc_barrier);
5353
5354         nfs4_setup_sequence(d_data->res.server,
5355                         &d_data->args.seq_args,
5356                         &d_data->res.seq_res,
5357                         task);
5358 }
5359
5360 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5361         .rpc_call_prepare = nfs4_delegreturn_prepare,
5362         .rpc_call_done = nfs4_delegreturn_done,
5363         .rpc_release = nfs4_delegreturn_release,
5364 };
5365
5366 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5367 {
5368         struct nfs4_delegreturndata *data;
5369         struct nfs_server *server = NFS_SERVER(inode);
5370         struct rpc_task *task;
5371         struct rpc_message msg = {
5372                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5373                 .rpc_cred = cred,
5374         };
5375         struct rpc_task_setup task_setup_data = {
5376                 .rpc_client = server->client,
5377                 .rpc_message = &msg,
5378                 .callback_ops = &nfs4_delegreturn_ops,
5379                 .flags = RPC_TASK_ASYNC,
5380         };
5381         int status = 0;
5382
5383         data = kzalloc(sizeof(*data), GFP_NOFS);
5384         if (data == NULL)
5385                 return -ENOMEM;
5386         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5387         data->args.fhandle = &data->fh;
5388         data->args.stateid = &data->stateid;
5389         data->args.bitmask = server->cache_consistency_bitmask;
5390         nfs_copy_fh(&data->fh, NFS_FH(inode));
5391         nfs4_stateid_copy(&data->stateid, stateid);
5392         data->res.fattr = &data->fattr;
5393         data->res.server = server;
5394         nfs_fattr_init(data->res.fattr);
5395         data->timestamp = jiffies;
5396         data->rpc_status = 0;
5397         data->inode = nfs_igrab_and_active(inode);
5398         if (data->inode)
5399                 data->roc = nfs4_roc(inode);
5400
5401         task_setup_data.callback_data = data;
5402         msg.rpc_argp = &data->args;
5403         msg.rpc_resp = &data->res;
5404         task = rpc_run_task(&task_setup_data);
5405         if (IS_ERR(task))
5406                 return PTR_ERR(task);
5407         if (!issync)
5408                 goto out;
5409         status = nfs4_wait_for_completion_rpc_task(task);
5410         if (status != 0)
5411                 goto out;
5412         status = data->rpc_status;
5413         if (status == 0)
5414                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5415         else
5416                 nfs_refresh_inode(inode, &data->fattr);
5417 out:
5418         rpc_put_task(task);
5419         return status;
5420 }
5421
5422 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5423 {
5424         struct nfs_server *server = NFS_SERVER(inode);
5425         struct nfs4_exception exception = { };
5426         int err;
5427         do {
5428                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5429                 trace_nfs4_delegreturn(inode, err);
5430                 switch (err) {
5431                         case -NFS4ERR_STALE_STATEID:
5432                         case -NFS4ERR_EXPIRED:
5433                         case 0:
5434                                 return 0;
5435                 }
5436                 err = nfs4_handle_exception(server, err, &exception);
5437         } while (exception.retry);
5438         return err;
5439 }
5440
5441 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5442 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5443
5444 /*
5445  * sleep, with exponential backoff, and retry the LOCK operation.
5446  */
5447 static unsigned long
5448 nfs4_set_lock_task_retry(unsigned long timeout)
5449 {
5450         freezable_schedule_timeout_killable_unsafe(timeout);
5451         timeout <<= 1;
5452         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5453                 return NFS4_LOCK_MAXTIMEOUT;
5454         return timeout;
5455 }
5456
5457 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5458 {
5459         struct inode *inode = state->inode;
5460         struct nfs_server *server = NFS_SERVER(inode);
5461         struct nfs_client *clp = server->nfs_client;
5462         struct nfs_lockt_args arg = {
5463                 .fh = NFS_FH(inode),
5464                 .fl = request,
5465         };
5466         struct nfs_lockt_res res = {
5467                 .denied = request,
5468         };
5469         struct rpc_message msg = {
5470                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5471                 .rpc_argp       = &arg,
5472                 .rpc_resp       = &res,
5473                 .rpc_cred       = state->owner->so_cred,
5474         };
5475         struct nfs4_lock_state *lsp;
5476         int status;
5477
5478         arg.lock_owner.clientid = clp->cl_clientid;
5479         status = nfs4_set_lock_state(state, request);
5480         if (status != 0)
5481                 goto out;
5482         lsp = request->fl_u.nfs4_fl.owner;
5483         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5484         arg.lock_owner.s_dev = server->s_dev;
5485         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5486         switch (status) {
5487                 case 0:
5488                         request->fl_type = F_UNLCK;
5489                         break;
5490                 case -NFS4ERR_DENIED:
5491                         status = 0;
5492         }
5493         request->fl_ops->fl_release_private(request);
5494         request->fl_ops = NULL;
5495 out:
5496         return status;
5497 }
5498
5499 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5500 {
5501         struct nfs4_exception exception = { };
5502         int err;
5503
5504         do {
5505                 err = _nfs4_proc_getlk(state, cmd, request);
5506                 trace_nfs4_get_lock(request, state, cmd, err);
5507                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5508                                 &exception);
5509         } while (exception.retry);
5510         return err;
5511 }
5512
5513 static int do_vfs_lock(struct inode *inode, struct file_lock *fl)
5514 {
5515         return locks_lock_inode_wait(inode, fl);
5516 }
5517
5518 struct nfs4_unlockdata {
5519         struct nfs_locku_args arg;
5520         struct nfs_locku_res res;
5521         struct nfs4_lock_state *lsp;
5522         struct nfs_open_context *ctx;
5523         struct file_lock fl;
5524         struct nfs_server *server;
5525         unsigned long timestamp;
5526 };
5527
5528 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5529                 struct nfs_open_context *ctx,
5530                 struct nfs4_lock_state *lsp,
5531                 struct nfs_seqid *seqid)
5532 {
5533         struct nfs4_unlockdata *p;
5534         struct inode *inode = lsp->ls_state->inode;
5535
5536         p = kzalloc(sizeof(*p), GFP_NOFS);
5537         if (p == NULL)
5538                 return NULL;
5539         p->arg.fh = NFS_FH(inode);
5540         p->arg.fl = &p->fl;
5541         p->arg.seqid = seqid;
5542         p->res.seqid = seqid;
5543         p->lsp = lsp;
5544         atomic_inc(&lsp->ls_count);
5545         /* Ensure we don't close file until we're done freeing locks! */
5546         p->ctx = get_nfs_open_context(ctx);
5547         memcpy(&p->fl, fl, sizeof(p->fl));
5548         p->server = NFS_SERVER(inode);
5549         return p;
5550 }
5551
5552 static void nfs4_locku_release_calldata(void *data)
5553 {
5554         struct nfs4_unlockdata *calldata = data;
5555         nfs_free_seqid(calldata->arg.seqid);
5556         nfs4_put_lock_state(calldata->lsp);
5557         put_nfs_open_context(calldata->ctx);
5558         kfree(calldata);
5559 }
5560
5561 static void nfs4_locku_done(struct rpc_task *task, void *data)
5562 {
5563         struct nfs4_unlockdata *calldata = data;
5564
5565         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5566                 return;
5567         switch (task->tk_status) {
5568                 case 0:
5569                         renew_lease(calldata->server, calldata->timestamp);
5570                         do_vfs_lock(calldata->lsp->ls_state->inode, &calldata->fl);
5571                         if (nfs4_update_lock_stateid(calldata->lsp,
5572                                         &calldata->res.stateid))
5573                                 break;
5574                 case -NFS4ERR_BAD_STATEID:
5575                 case -NFS4ERR_OLD_STATEID:
5576                 case -NFS4ERR_STALE_STATEID:
5577                 case -NFS4ERR_EXPIRED:
5578                         if (!nfs4_stateid_match(&calldata->arg.stateid,
5579                                                 &calldata->lsp->ls_stateid))
5580                                 rpc_restart_call_prepare(task);
5581                         break;
5582                 default:
5583                         if (nfs4_async_handle_error(task, calldata->server,
5584                                                     NULL, NULL) == -EAGAIN)
5585                                 rpc_restart_call_prepare(task);
5586         }
5587         nfs_release_seqid(calldata->arg.seqid);
5588 }
5589
5590 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5591 {
5592         struct nfs4_unlockdata *calldata = data;
5593
5594         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5595                 goto out_wait;
5596         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5597         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5598                 /* Note: exit _without_ running nfs4_locku_done */
5599                 goto out_no_action;
5600         }
5601         calldata->timestamp = jiffies;
5602         if (nfs4_setup_sequence(calldata->server,
5603                                 &calldata->arg.seq_args,
5604                                 &calldata->res.seq_res,
5605                                 task) != 0)
5606                 nfs_release_seqid(calldata->arg.seqid);
5607         return;
5608 out_no_action:
5609         task->tk_action = NULL;
5610 out_wait:
5611         nfs4_sequence_done(task, &calldata->res.seq_res);
5612 }
5613
5614 static const struct rpc_call_ops nfs4_locku_ops = {
5615         .rpc_call_prepare = nfs4_locku_prepare,
5616         .rpc_call_done = nfs4_locku_done,
5617         .rpc_release = nfs4_locku_release_calldata,
5618 };
5619
5620 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5621                 struct nfs_open_context *ctx,
5622                 struct nfs4_lock_state *lsp,
5623                 struct nfs_seqid *seqid)
5624 {
5625         struct nfs4_unlockdata *data;
5626         struct rpc_message msg = {
5627                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5628                 .rpc_cred = ctx->cred,
5629         };
5630         struct rpc_task_setup task_setup_data = {
5631                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5632                 .rpc_message = &msg,
5633                 .callback_ops = &nfs4_locku_ops,
5634                 .workqueue = nfsiod_workqueue,
5635                 .flags = RPC_TASK_ASYNC,
5636         };
5637
5638         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5639                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5640
5641         /* Ensure this is an unlock - when canceling a lock, the
5642          * canceled lock is passed in, and it won't be an unlock.
5643          */
5644         fl->fl_type = F_UNLCK;
5645
5646         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5647         if (data == NULL) {
5648                 nfs_free_seqid(seqid);
5649                 return ERR_PTR(-ENOMEM);
5650         }
5651
5652         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5653         msg.rpc_argp = &data->arg;
5654         msg.rpc_resp = &data->res;
5655         task_setup_data.callback_data = data;
5656         return rpc_run_task(&task_setup_data);
5657 }
5658
5659 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5660 {
5661         struct inode *inode = state->inode;
5662         struct nfs4_state_owner *sp = state->owner;
5663         struct nfs_inode *nfsi = NFS_I(inode);
5664         struct nfs_seqid *seqid;
5665         struct nfs4_lock_state *lsp;
5666         struct rpc_task *task;
5667         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5668         int status = 0;
5669         unsigned char fl_flags = request->fl_flags;
5670
5671         status = nfs4_set_lock_state(state, request);
5672         /* Unlock _before_ we do the RPC call */
5673         request->fl_flags |= FL_EXISTS;
5674         /* Exclude nfs_delegation_claim_locks() */
5675         mutex_lock(&sp->so_delegreturn_mutex);
5676         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5677         down_read(&nfsi->rwsem);
5678         if (do_vfs_lock(inode, request) == -ENOENT) {
5679                 up_read(&nfsi->rwsem);
5680                 mutex_unlock(&sp->so_delegreturn_mutex);
5681                 goto out;
5682         }
5683         up_read(&nfsi->rwsem);
5684         mutex_unlock(&sp->so_delegreturn_mutex);
5685         if (status != 0)
5686                 goto out;
5687         /* Is this a delegated lock? */
5688         lsp = request->fl_u.nfs4_fl.owner;
5689         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5690                 goto out;
5691         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5692         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5693         status = -ENOMEM;
5694         if (IS_ERR(seqid))
5695                 goto out;
5696         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5697         status = PTR_ERR(task);
5698         if (IS_ERR(task))
5699                 goto out;
5700         status = nfs4_wait_for_completion_rpc_task(task);
5701         rpc_put_task(task);
5702 out:
5703         request->fl_flags = fl_flags;
5704         trace_nfs4_unlock(request, state, F_SETLK, status);
5705         return status;
5706 }
5707
5708 struct nfs4_lockdata {
5709         struct nfs_lock_args arg;
5710         struct nfs_lock_res res;
5711         struct nfs4_lock_state *lsp;
5712         struct nfs_open_context *ctx;
5713         struct file_lock fl;
5714         unsigned long timestamp;
5715         int rpc_status;
5716         int cancelled;
5717         struct nfs_server *server;
5718 };
5719
5720 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5721                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5722                 gfp_t gfp_mask)
5723 {
5724         struct nfs4_lockdata *p;
5725         struct inode *inode = lsp->ls_state->inode;
5726         struct nfs_server *server = NFS_SERVER(inode);
5727         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5728
5729         p = kzalloc(sizeof(*p), gfp_mask);
5730         if (p == NULL)
5731                 return NULL;
5732
5733         p->arg.fh = NFS_FH(inode);
5734         p->arg.fl = &p->fl;
5735         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5736         if (IS_ERR(p->arg.open_seqid))
5737                 goto out_free;
5738         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
5739         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5740         if (IS_ERR(p->arg.lock_seqid))
5741                 goto out_free_seqid;
5742         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5743         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5744         p->arg.lock_owner.s_dev = server->s_dev;
5745         p->res.lock_seqid = p->arg.lock_seqid;
5746         p->lsp = lsp;
5747         p->server = server;
5748         atomic_inc(&lsp->ls_count);
5749         p->ctx = get_nfs_open_context(ctx);
5750         get_file(fl->fl_file);
5751         memcpy(&p->fl, fl, sizeof(p->fl));
5752         return p;
5753 out_free_seqid:
5754         nfs_free_seqid(p->arg.open_seqid);
5755 out_free:
5756         kfree(p);
5757         return NULL;
5758 }
5759
5760 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5761 {
5762         struct nfs4_lockdata *data = calldata;
5763         struct nfs4_state *state = data->lsp->ls_state;
5764
5765         dprintk("%s: begin!\n", __func__);
5766         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5767                 goto out_wait;
5768         /* Do we need to do an open_to_lock_owner? */
5769         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5770                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5771                         goto out_release_lock_seqid;
5772                 }
5773                 nfs4_stateid_copy(&data->arg.open_stateid,
5774                                 &state->open_stateid);
5775                 data->arg.new_lock_owner = 1;
5776                 data->res.open_seqid = data->arg.open_seqid;
5777         } else {
5778                 data->arg.new_lock_owner = 0;
5779                 nfs4_stateid_copy(&data->arg.lock_stateid,
5780                                 &data->lsp->ls_stateid);
5781         }
5782         if (!nfs4_valid_open_stateid(state)) {
5783                 data->rpc_status = -EBADF;
5784                 task->tk_action = NULL;
5785                 goto out_release_open_seqid;
5786         }
5787         data->timestamp = jiffies;
5788         if (nfs4_setup_sequence(data->server,
5789                                 &data->arg.seq_args,
5790                                 &data->res.seq_res,
5791                                 task) == 0)
5792                 return;
5793 out_release_open_seqid:
5794         nfs_release_seqid(data->arg.open_seqid);
5795 out_release_lock_seqid:
5796         nfs_release_seqid(data->arg.lock_seqid);
5797 out_wait:
5798         nfs4_sequence_done(task, &data->res.seq_res);
5799         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5800 }
5801
5802 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5803 {
5804         struct nfs4_lockdata *data = calldata;
5805         struct nfs4_lock_state *lsp = data->lsp;
5806
5807         dprintk("%s: begin!\n", __func__);
5808
5809         if (!nfs4_sequence_done(task, &data->res.seq_res))
5810                 return;
5811
5812         data->rpc_status = task->tk_status;
5813         switch (task->tk_status) {
5814         case 0:
5815                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
5816                                 data->timestamp);
5817                 if (data->arg.new_lock) {
5818                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5819                         if (do_vfs_lock(lsp->ls_state->inode, &data->fl) < 0) {
5820                                 rpc_restart_call_prepare(task);
5821                                 break;
5822                         }
5823                 }
5824                 if (data->arg.new_lock_owner != 0) {
5825                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
5826                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5827                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5828                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5829                         rpc_restart_call_prepare(task);
5830                 break;
5831         case -NFS4ERR_BAD_STATEID:
5832         case -NFS4ERR_OLD_STATEID:
5833         case -NFS4ERR_STALE_STATEID:
5834         case -NFS4ERR_EXPIRED:
5835                 if (data->arg.new_lock_owner != 0) {
5836                         if (!nfs4_stateid_match(&data->arg.open_stateid,
5837                                                 &lsp->ls_state->open_stateid))
5838                                 rpc_restart_call_prepare(task);
5839                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5840                                                 &lsp->ls_stateid))
5841                                 rpc_restart_call_prepare(task);
5842         }
5843         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5844 }
5845
5846 static void nfs4_lock_release(void *calldata)
5847 {
5848         struct nfs4_lockdata *data = calldata;
5849
5850         dprintk("%s: begin!\n", __func__);
5851         nfs_free_seqid(data->arg.open_seqid);
5852         if (data->cancelled != 0) {
5853                 struct rpc_task *task;
5854                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5855                                 data->arg.lock_seqid);
5856                 if (!IS_ERR(task))
5857                         rpc_put_task_async(task);
5858                 dprintk("%s: cancelling lock!\n", __func__);
5859         } else
5860                 nfs_free_seqid(data->arg.lock_seqid);
5861         nfs4_put_lock_state(data->lsp);
5862         put_nfs_open_context(data->ctx);
5863         fput(data->fl.fl_file);
5864         kfree(data);
5865         dprintk("%s: done!\n", __func__);
5866 }
5867
5868 static const struct rpc_call_ops nfs4_lock_ops = {
5869         .rpc_call_prepare = nfs4_lock_prepare,
5870         .rpc_call_done = nfs4_lock_done,
5871         .rpc_release = nfs4_lock_release,
5872 };
5873
5874 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5875 {
5876         switch (error) {
5877         case -NFS4ERR_ADMIN_REVOKED:
5878         case -NFS4ERR_BAD_STATEID:
5879                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5880                 if (new_lock_owner != 0 ||
5881                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5882                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5883                 break;
5884         case -NFS4ERR_STALE_STATEID:
5885                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5886         case -NFS4ERR_EXPIRED:
5887                 nfs4_schedule_lease_recovery(server->nfs_client);
5888         };
5889 }
5890
5891 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5892 {
5893         struct nfs4_lockdata *data;
5894         struct rpc_task *task;
5895         struct rpc_message msg = {
5896                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5897                 .rpc_cred = state->owner->so_cred,
5898         };
5899         struct rpc_task_setup task_setup_data = {
5900                 .rpc_client = NFS_CLIENT(state->inode),
5901                 .rpc_message = &msg,
5902                 .callback_ops = &nfs4_lock_ops,
5903                 .workqueue = nfsiod_workqueue,
5904                 .flags = RPC_TASK_ASYNC,
5905         };
5906         int ret;
5907
5908         dprintk("%s: begin!\n", __func__);
5909         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5910                         fl->fl_u.nfs4_fl.owner,
5911                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5912         if (data == NULL)
5913                 return -ENOMEM;
5914         if (IS_SETLKW(cmd))
5915                 data->arg.block = 1;
5916         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5917         msg.rpc_argp = &data->arg;
5918         msg.rpc_resp = &data->res;
5919         task_setup_data.callback_data = data;
5920         if (recovery_type > NFS_LOCK_NEW) {
5921                 if (recovery_type == NFS_LOCK_RECLAIM)
5922                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5923                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5924         } else
5925                 data->arg.new_lock = 1;
5926         task = rpc_run_task(&task_setup_data);
5927         if (IS_ERR(task))
5928                 return PTR_ERR(task);
5929         ret = nfs4_wait_for_completion_rpc_task(task);
5930         if (ret == 0) {
5931                 ret = data->rpc_status;
5932                 if (ret)
5933                         nfs4_handle_setlk_error(data->server, data->lsp,
5934                                         data->arg.new_lock_owner, ret);
5935         } else
5936                 data->cancelled = 1;
5937         rpc_put_task(task);
5938         dprintk("%s: done, ret = %d!\n", __func__, ret);
5939         return ret;
5940 }
5941
5942 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5943 {
5944         struct nfs_server *server = NFS_SERVER(state->inode);
5945         struct nfs4_exception exception = {
5946                 .inode = state->inode,
5947         };
5948         int err;
5949
5950         do {
5951                 /* Cache the lock if possible... */
5952                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5953                         return 0;
5954                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5955                 trace_nfs4_lock_reclaim(request, state, F_SETLK, err);
5956                 if (err != -NFS4ERR_DELAY)
5957                         break;
5958                 nfs4_handle_exception(server, err, &exception);
5959         } while (exception.retry);
5960         return err;
5961 }
5962
5963 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
5964 {
5965         struct nfs_server *server = NFS_SERVER(state->inode);
5966         struct nfs4_exception exception = {
5967                 .inode = state->inode,
5968         };
5969         int err;
5970
5971         err = nfs4_set_lock_state(state, request);
5972         if (err != 0)
5973                 return err;
5974         if (!recover_lost_locks) {
5975                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
5976                 return 0;
5977         }
5978         do {
5979                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5980                         return 0;
5981                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
5982                 trace_nfs4_lock_expired(request, state, F_SETLK, err);
5983                 switch (err) {
5984                 default:
5985                         goto out;
5986                 case -NFS4ERR_GRACE:
5987                 case -NFS4ERR_DELAY:
5988                         nfs4_handle_exception(server, err, &exception);
5989                         err = 0;
5990                 }
5991         } while (exception.retry);
5992 out:
5993         return err;
5994 }
5995
5996 #if defined(CONFIG_NFS_V4_1)
5997 /**
5998  * nfs41_check_expired_locks - possibly free a lock stateid
5999  *
6000  * @state: NFSv4 state for an inode
6001  *
6002  * Returns NFS_OK if recovery for this stateid is now finished.
6003  * Otherwise a negative NFS4ERR value is returned.
6004  */
6005 static int nfs41_check_expired_locks(struct nfs4_state *state)
6006 {
6007         int status, ret = -NFS4ERR_BAD_STATEID;
6008         struct nfs4_lock_state *lsp;
6009         struct nfs_server *server = NFS_SERVER(state->inode);
6010
6011         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
6012                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
6013                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
6014
6015                         status = nfs41_test_stateid(server,
6016                                         &lsp->ls_stateid,
6017                                         cred);
6018                         trace_nfs4_test_lock_stateid(state, lsp, status);
6019                         if (status != NFS_OK) {
6020                                 /* Free the stateid unless the server
6021                                  * informs us the stateid is unrecognized. */
6022                                 if (status != -NFS4ERR_BAD_STATEID)
6023                                         nfs41_free_stateid(server,
6024                                                         &lsp->ls_stateid,
6025                                                         cred);
6026                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6027                                 ret = status;
6028                         }
6029                 }
6030         };
6031
6032         return ret;
6033 }
6034
6035 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
6036 {
6037         int status = NFS_OK;
6038
6039         if (test_bit(LK_STATE_IN_USE, &state->flags))
6040                 status = nfs41_check_expired_locks(state);
6041         if (status != NFS_OK)
6042                 status = nfs4_lock_expired(state, request);
6043         return status;
6044 }
6045 #endif
6046
6047 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6048 {
6049         struct nfs_inode *nfsi = NFS_I(state->inode);
6050         unsigned char fl_flags = request->fl_flags;
6051         int status = -ENOLCK;
6052
6053         if ((fl_flags & FL_POSIX) &&
6054                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
6055                 goto out;
6056         /* Is this a delegated open? */
6057         status = nfs4_set_lock_state(state, request);
6058         if (status != 0)
6059                 goto out;
6060         request->fl_flags |= FL_ACCESS;
6061         status = do_vfs_lock(state->inode, request);
6062         if (status < 0)
6063                 goto out;
6064         down_read(&nfsi->rwsem);
6065         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
6066                 /* Yes: cache locks! */
6067                 /* ...but avoid races with delegation recall... */
6068                 request->fl_flags = fl_flags & ~FL_SLEEP;
6069                 status = do_vfs_lock(state->inode, request);
6070                 up_read(&nfsi->rwsem);
6071                 goto out;
6072         }
6073         up_read(&nfsi->rwsem);
6074         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
6075 out:
6076         request->fl_flags = fl_flags;
6077         return status;
6078 }
6079
6080 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6081 {
6082         struct nfs4_exception exception = {
6083                 .state = state,
6084                 .inode = state->inode,
6085         };
6086         int err;
6087
6088         do {
6089                 err = _nfs4_proc_setlk(state, cmd, request);
6090                 trace_nfs4_set_lock(request, state, cmd, err);
6091                 if (err == -NFS4ERR_DENIED)
6092                         err = -EAGAIN;
6093                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
6094                                 err, &exception);
6095         } while (exception.retry);
6096         return err;
6097 }
6098
6099 static int
6100 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
6101 {
6102         struct nfs_open_context *ctx;
6103         struct nfs4_state *state;
6104         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
6105         int status;
6106
6107         /* verify open state */
6108         ctx = nfs_file_open_context(filp);
6109         state = ctx->state;
6110
6111         if (request->fl_start < 0 || request->fl_end < 0)
6112                 return -EINVAL;
6113
6114         if (IS_GETLK(cmd)) {
6115                 if (state != NULL)
6116                         return nfs4_proc_getlk(state, F_GETLK, request);
6117                 return 0;
6118         }
6119
6120         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
6121                 return -EINVAL;
6122
6123         if (request->fl_type == F_UNLCK) {
6124                 if (state != NULL)
6125                         return nfs4_proc_unlck(state, cmd, request);
6126                 return 0;
6127         }
6128
6129         if (state == NULL)
6130                 return -ENOLCK;
6131         /*
6132          * Don't rely on the VFS having checked the file open mode,
6133          * since it won't do this for flock() locks.
6134          */
6135         switch (request->fl_type) {
6136         case F_RDLCK:
6137                 if (!(filp->f_mode & FMODE_READ))
6138                         return -EBADF;
6139                 break;
6140         case F_WRLCK:
6141                 if (!(filp->f_mode & FMODE_WRITE))
6142                         return -EBADF;
6143         }
6144
6145         do {
6146                 status = nfs4_proc_setlk(state, cmd, request);
6147                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6148                         break;
6149                 timeout = nfs4_set_lock_task_retry(timeout);
6150                 status = -ERESTARTSYS;
6151                 if (signalled())
6152                         break;
6153         } while(status < 0);
6154         return status;
6155 }
6156
6157 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6158 {
6159         struct nfs_server *server = NFS_SERVER(state->inode);
6160         int err;
6161
6162         err = nfs4_set_lock_state(state, fl);
6163         if (err != 0)
6164                 return err;
6165         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6166         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6167 }
6168
6169 struct nfs_release_lockowner_data {
6170         struct nfs4_lock_state *lsp;
6171         struct nfs_server *server;
6172         struct nfs_release_lockowner_args args;
6173         struct nfs_release_lockowner_res res;
6174         unsigned long timestamp;
6175 };
6176
6177 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6178 {
6179         struct nfs_release_lockowner_data *data = calldata;
6180         struct nfs_server *server = data->server;
6181         nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6182                              &data->args.seq_args, &data->res.seq_res, task);
6183         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6184         data->timestamp = jiffies;
6185 }
6186
6187 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6188 {
6189         struct nfs_release_lockowner_data *data = calldata;
6190         struct nfs_server *server = data->server;
6191
6192         nfs40_sequence_done(task, &data->res.seq_res);
6193
6194         switch (task->tk_status) {
6195         case 0:
6196                 renew_lease(server, data->timestamp);
6197                 break;
6198         case -NFS4ERR_STALE_CLIENTID:
6199         case -NFS4ERR_EXPIRED:
6200                 nfs4_schedule_lease_recovery(server->nfs_client);
6201                 break;
6202         case -NFS4ERR_LEASE_MOVED:
6203         case -NFS4ERR_DELAY:
6204                 if (nfs4_async_handle_error(task, server,
6205                                             NULL, NULL) == -EAGAIN)
6206                         rpc_restart_call_prepare(task);
6207         }
6208 }
6209
6210 static void nfs4_release_lockowner_release(void *calldata)
6211 {
6212         struct nfs_release_lockowner_data *data = calldata;
6213         nfs4_free_lock_state(data->server, data->lsp);
6214         kfree(calldata);
6215 }
6216
6217 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6218         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6219         .rpc_call_done = nfs4_release_lockowner_done,
6220         .rpc_release = nfs4_release_lockowner_release,
6221 };
6222
6223 static void
6224 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6225 {
6226         struct nfs_release_lockowner_data *data;
6227         struct rpc_message msg = {
6228                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6229         };
6230
6231         if (server->nfs_client->cl_mvops->minor_version != 0)
6232                 return;
6233
6234         data = kmalloc(sizeof(*data), GFP_NOFS);
6235         if (!data)
6236                 return;
6237         data->lsp = lsp;
6238         data->server = server;
6239         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6240         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6241         data->args.lock_owner.s_dev = server->s_dev;
6242
6243         msg.rpc_argp = &data->args;
6244         msg.rpc_resp = &data->res;
6245         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6246         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6247 }
6248
6249 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6250
6251 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
6252                                    struct dentry *dentry, const char *key,
6253                                    const void *buf, size_t buflen,
6254                                    int flags)
6255 {
6256         return nfs4_proc_set_acl(d_inode(dentry), buf, buflen);
6257 }
6258
6259 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
6260                                    struct dentry *dentry, const char *key,
6261                                    void *buf, size_t buflen)
6262 {
6263         return nfs4_proc_get_acl(d_inode(dentry), buf, buflen);
6264 }
6265
6266 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
6267 {
6268         return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
6269 }
6270
6271 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6272
6273 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
6274                                      struct dentry *dentry, const char *key,
6275                                      const void *buf, size_t buflen,
6276                                      int flags)
6277 {
6278         if (security_ismaclabel(key))
6279                 return nfs4_set_security_label(dentry, buf, buflen);
6280
6281         return -EOPNOTSUPP;
6282 }
6283
6284 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
6285                                      struct dentry *dentry, const char *key,
6286                                      void *buf, size_t buflen)
6287 {
6288         if (security_ismaclabel(key))
6289                 return nfs4_get_security_label(d_inode(dentry), buf, buflen);
6290         return -EOPNOTSUPP;
6291 }
6292
6293 static ssize_t
6294 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6295 {
6296         int len = 0;
6297
6298         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
6299                 len = security_inode_listsecurity(inode, list, list_len);
6300                 if (list_len && len > list_len)
6301                         return -ERANGE;
6302         }
6303         return len;
6304 }
6305
6306 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6307         .prefix = XATTR_SECURITY_PREFIX,
6308         .get    = nfs4_xattr_get_nfs4_label,
6309         .set    = nfs4_xattr_set_nfs4_label,
6310 };
6311
6312 #else
6313
6314 static ssize_t
6315 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6316 {
6317         return 0;
6318 }
6319
6320 #endif
6321
6322 /*
6323  * nfs_fhget will use either the mounted_on_fileid or the fileid
6324  */
6325 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6326 {
6327         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6328                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6329               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6330               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6331                 return;
6332
6333         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6334                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6335         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6336         fattr->nlink = 2;
6337 }
6338
6339 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6340                                    const struct qstr *name,
6341                                    struct nfs4_fs_locations *fs_locations,
6342                                    struct page *page)
6343 {
6344         struct nfs_server *server = NFS_SERVER(dir);
6345         u32 bitmask[3] = {
6346                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6347         };
6348         struct nfs4_fs_locations_arg args = {
6349                 .dir_fh = NFS_FH(dir),
6350                 .name = name,
6351                 .page = page,
6352                 .bitmask = bitmask,
6353         };
6354         struct nfs4_fs_locations_res res = {
6355                 .fs_locations = fs_locations,
6356         };
6357         struct rpc_message msg = {
6358                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6359                 .rpc_argp = &args,
6360                 .rpc_resp = &res,
6361         };
6362         int status;
6363
6364         dprintk("%s: start\n", __func__);
6365
6366         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6367          * is not supported */
6368         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6369                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6370         else
6371                 bitmask[0] |= FATTR4_WORD0_FILEID;
6372
6373         nfs_fattr_init(&fs_locations->fattr);
6374         fs_locations->server = server;
6375         fs_locations->nlocations = 0;
6376         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6377         dprintk("%s: returned status = %d\n", __func__, status);
6378         return status;
6379 }
6380
6381 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6382                            const struct qstr *name,
6383                            struct nfs4_fs_locations *fs_locations,
6384                            struct page *page)
6385 {
6386         struct nfs4_exception exception = { };
6387         int err;
6388         do {
6389                 err = _nfs4_proc_fs_locations(client, dir, name,
6390                                 fs_locations, page);
6391                 trace_nfs4_get_fs_locations(dir, name, err);
6392                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6393                                 &exception);
6394         } while (exception.retry);
6395         return err;
6396 }
6397
6398 /*
6399  * This operation also signals the server that this client is
6400  * performing migration recovery.  The server can stop returning
6401  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6402  * appended to this compound to identify the client ID which is
6403  * performing recovery.
6404  */
6405 static int _nfs40_proc_get_locations(struct inode *inode,
6406                                      struct nfs4_fs_locations *locations,
6407                                      struct page *page, struct rpc_cred *cred)
6408 {
6409         struct nfs_server *server = NFS_SERVER(inode);
6410         struct rpc_clnt *clnt = server->client;
6411         u32 bitmask[2] = {
6412                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6413         };
6414         struct nfs4_fs_locations_arg args = {
6415                 .clientid       = server->nfs_client->cl_clientid,
6416                 .fh             = NFS_FH(inode),
6417                 .page           = page,
6418                 .bitmask        = bitmask,
6419                 .migration      = 1,            /* skip LOOKUP */
6420                 .renew          = 1,            /* append RENEW */
6421         };
6422         struct nfs4_fs_locations_res res = {
6423                 .fs_locations   = locations,
6424                 .migration      = 1,
6425                 .renew          = 1,
6426         };
6427         struct rpc_message msg = {
6428                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6429                 .rpc_argp       = &args,
6430                 .rpc_resp       = &res,
6431                 .rpc_cred       = cred,
6432         };
6433         unsigned long now = jiffies;
6434         int status;
6435
6436         nfs_fattr_init(&locations->fattr);
6437         locations->server = server;
6438         locations->nlocations = 0;
6439
6440         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6441         nfs4_set_sequence_privileged(&args.seq_args);
6442         status = nfs4_call_sync_sequence(clnt, server, &msg,
6443                                         &args.seq_args, &res.seq_res);
6444         if (status)
6445                 return status;
6446
6447         renew_lease(server, now);
6448         return 0;
6449 }
6450
6451 #ifdef CONFIG_NFS_V4_1
6452
6453 /*
6454  * This operation also signals the server that this client is
6455  * performing migration recovery.  The server can stop asserting
6456  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6457  * performing this operation is identified in the SEQUENCE
6458  * operation in this compound.
6459  *
6460  * When the client supports GETATTR(fs_locations_info), it can
6461  * be plumbed in here.
6462  */
6463 static int _nfs41_proc_get_locations(struct inode *inode,
6464                                      struct nfs4_fs_locations *locations,
6465                                      struct page *page, struct rpc_cred *cred)
6466 {
6467         struct nfs_server *server = NFS_SERVER(inode);
6468         struct rpc_clnt *clnt = server->client;
6469         u32 bitmask[2] = {
6470                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6471         };
6472         struct nfs4_fs_locations_arg args = {
6473                 .fh             = NFS_FH(inode),
6474                 .page           = page,
6475                 .bitmask        = bitmask,
6476                 .migration      = 1,            /* skip LOOKUP */
6477         };
6478         struct nfs4_fs_locations_res res = {
6479                 .fs_locations   = locations,
6480                 .migration      = 1,
6481         };
6482         struct rpc_message msg = {
6483                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6484                 .rpc_argp       = &args,
6485                 .rpc_resp       = &res,
6486                 .rpc_cred       = cred,
6487         };
6488         int status;
6489
6490         nfs_fattr_init(&locations->fattr);
6491         locations->server = server;
6492         locations->nlocations = 0;
6493
6494         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6495         nfs4_set_sequence_privileged(&args.seq_args);
6496         status = nfs4_call_sync_sequence(clnt, server, &msg,
6497                                         &args.seq_args, &res.seq_res);
6498         if (status == NFS4_OK &&
6499             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6500                 status = -NFS4ERR_LEASE_MOVED;
6501         return status;
6502 }
6503
6504 #endif  /* CONFIG_NFS_V4_1 */
6505
6506 /**
6507  * nfs4_proc_get_locations - discover locations for a migrated FSID
6508  * @inode: inode on FSID that is migrating
6509  * @locations: result of query
6510  * @page: buffer
6511  * @cred: credential to use for this operation
6512  *
6513  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6514  * operation failed, or a negative errno if a local error occurred.
6515  *
6516  * On success, "locations" is filled in, but if the server has
6517  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6518  * asserted.
6519  *
6520  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6521  * from this client that require migration recovery.
6522  */
6523 int nfs4_proc_get_locations(struct inode *inode,
6524                             struct nfs4_fs_locations *locations,
6525                             struct page *page, struct rpc_cred *cred)
6526 {
6527         struct nfs_server *server = NFS_SERVER(inode);
6528         struct nfs_client *clp = server->nfs_client;
6529         const struct nfs4_mig_recovery_ops *ops =
6530                                         clp->cl_mvops->mig_recovery_ops;
6531         struct nfs4_exception exception = { };
6532         int status;
6533
6534         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6535                 (unsigned long long)server->fsid.major,
6536                 (unsigned long long)server->fsid.minor,
6537                 clp->cl_hostname);
6538         nfs_display_fhandle(NFS_FH(inode), __func__);
6539
6540         do {
6541                 status = ops->get_locations(inode, locations, page, cred);
6542                 if (status != -NFS4ERR_DELAY)
6543                         break;
6544                 nfs4_handle_exception(server, status, &exception);
6545         } while (exception.retry);
6546         return status;
6547 }
6548
6549 /*
6550  * This operation also signals the server that this client is
6551  * performing "lease moved" recovery.  The server can stop
6552  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6553  * is appended to this compound to identify the client ID which is
6554  * performing recovery.
6555  */
6556 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6557 {
6558         struct nfs_server *server = NFS_SERVER(inode);
6559         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6560         struct rpc_clnt *clnt = server->client;
6561         struct nfs4_fsid_present_arg args = {
6562                 .fh             = NFS_FH(inode),
6563                 .clientid       = clp->cl_clientid,
6564                 .renew          = 1,            /* append RENEW */
6565         };
6566         struct nfs4_fsid_present_res res = {
6567                 .renew          = 1,
6568         };
6569         struct rpc_message msg = {
6570                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6571                 .rpc_argp       = &args,
6572                 .rpc_resp       = &res,
6573                 .rpc_cred       = cred,
6574         };
6575         unsigned long now = jiffies;
6576         int status;
6577
6578         res.fh = nfs_alloc_fhandle();
6579         if (res.fh == NULL)
6580                 return -ENOMEM;
6581
6582         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6583         nfs4_set_sequence_privileged(&args.seq_args);
6584         status = nfs4_call_sync_sequence(clnt, server, &msg,
6585                                                 &args.seq_args, &res.seq_res);
6586         nfs_free_fhandle(res.fh);
6587         if (status)
6588                 return status;
6589
6590         do_renew_lease(clp, now);
6591         return 0;
6592 }
6593
6594 #ifdef CONFIG_NFS_V4_1
6595
6596 /*
6597  * This operation also signals the server that this client is
6598  * performing "lease moved" recovery.  The server can stop asserting
6599  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6600  * this operation is identified in the SEQUENCE operation in this
6601  * compound.
6602  */
6603 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6604 {
6605         struct nfs_server *server = NFS_SERVER(inode);
6606         struct rpc_clnt *clnt = server->client;
6607         struct nfs4_fsid_present_arg args = {
6608                 .fh             = NFS_FH(inode),
6609         };
6610         struct nfs4_fsid_present_res res = {
6611         };
6612         struct rpc_message msg = {
6613                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6614                 .rpc_argp       = &args,
6615                 .rpc_resp       = &res,
6616                 .rpc_cred       = cred,
6617         };
6618         int status;
6619
6620         res.fh = nfs_alloc_fhandle();
6621         if (res.fh == NULL)
6622                 return -ENOMEM;
6623
6624         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6625         nfs4_set_sequence_privileged(&args.seq_args);
6626         status = nfs4_call_sync_sequence(clnt, server, &msg,
6627                                                 &args.seq_args, &res.seq_res);
6628         nfs_free_fhandle(res.fh);
6629         if (status == NFS4_OK &&
6630             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6631                 status = -NFS4ERR_LEASE_MOVED;
6632         return status;
6633 }
6634
6635 #endif  /* CONFIG_NFS_V4_1 */
6636
6637 /**
6638  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6639  * @inode: inode on FSID to check
6640  * @cred: credential to use for this operation
6641  *
6642  * Server indicates whether the FSID is present, moved, or not
6643  * recognized.  This operation is necessary to clear a LEASE_MOVED
6644  * condition for this client ID.
6645  *
6646  * Returns NFS4_OK if the FSID is present on this server,
6647  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6648  *  NFS4ERR code if some error occurred on the server, or a
6649  *  negative errno if a local failure occurred.
6650  */
6651 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6652 {
6653         struct nfs_server *server = NFS_SERVER(inode);
6654         struct nfs_client *clp = server->nfs_client;
6655         const struct nfs4_mig_recovery_ops *ops =
6656                                         clp->cl_mvops->mig_recovery_ops;
6657         struct nfs4_exception exception = { };
6658         int status;
6659
6660         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6661                 (unsigned long long)server->fsid.major,
6662                 (unsigned long long)server->fsid.minor,
6663                 clp->cl_hostname);
6664         nfs_display_fhandle(NFS_FH(inode), __func__);
6665
6666         do {
6667                 status = ops->fsid_present(inode, cred);
6668                 if (status != -NFS4ERR_DELAY)
6669                         break;
6670                 nfs4_handle_exception(server, status, &exception);
6671         } while (exception.retry);
6672         return status;
6673 }
6674
6675 /**
6676  * If 'use_integrity' is true and the state managment nfs_client
6677  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6678  * and the machine credential as per RFC3530bis and RFC5661 Security
6679  * Considerations sections. Otherwise, just use the user cred with the
6680  * filesystem's rpc_client.
6681  */
6682 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6683 {
6684         int status;
6685         struct nfs4_secinfo_arg args = {
6686                 .dir_fh = NFS_FH(dir),
6687                 .name   = name,
6688         };
6689         struct nfs4_secinfo_res res = {
6690                 .flavors     = flavors,
6691         };
6692         struct rpc_message msg = {
6693                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6694                 .rpc_argp = &args,
6695                 .rpc_resp = &res,
6696         };
6697         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6698         struct rpc_cred *cred = NULL;
6699
6700         if (use_integrity) {
6701                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6702                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6703                 msg.rpc_cred = cred;
6704         }
6705
6706         dprintk("NFS call  secinfo %s\n", name->name);
6707
6708         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6709                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6710
6711         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6712                                 &res.seq_res, 0);
6713         dprintk("NFS reply  secinfo: %d\n", status);
6714
6715         if (cred)
6716                 put_rpccred(cred);
6717
6718         return status;
6719 }
6720
6721 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6722                       struct nfs4_secinfo_flavors *flavors)
6723 {
6724         struct nfs4_exception exception = { };
6725         int err;
6726         do {
6727                 err = -NFS4ERR_WRONGSEC;
6728
6729                 /* try to use integrity protection with machine cred */
6730                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6731                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6732
6733                 /*
6734                  * if unable to use integrity protection, or SECINFO with
6735                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6736                  * disallowed by spec, but exists in deployed servers) use
6737                  * the current filesystem's rpc_client and the user cred.
6738                  */
6739                 if (err == -NFS4ERR_WRONGSEC)
6740                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6741
6742                 trace_nfs4_secinfo(dir, name, err);
6743                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6744                                 &exception);
6745         } while (exception.retry);
6746         return err;
6747 }
6748
6749 #ifdef CONFIG_NFS_V4_1
6750 /*
6751  * Check the exchange flags returned by the server for invalid flags, having
6752  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6753  * DS flags set.
6754  */
6755 static int nfs4_check_cl_exchange_flags(u32 flags)
6756 {
6757         if (flags & ~EXCHGID4_FLAG_MASK_R)
6758                 goto out_inval;
6759         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6760             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6761                 goto out_inval;
6762         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6763                 goto out_inval;
6764         return NFS_OK;
6765 out_inval:
6766         return -NFS4ERR_INVAL;
6767 }
6768
6769 static bool
6770 nfs41_same_server_scope(struct nfs41_server_scope *a,
6771                         struct nfs41_server_scope *b)
6772 {
6773         if (a->server_scope_sz == b->server_scope_sz &&
6774             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6775                 return true;
6776
6777         return false;
6778 }
6779
6780 /*
6781  * nfs4_proc_bind_conn_to_session()
6782  *
6783  * The 4.1 client currently uses the same TCP connection for the
6784  * fore and backchannel.
6785  */
6786 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6787 {
6788         int status;
6789         struct nfs41_bind_conn_to_session_args args = {
6790                 .client = clp,
6791                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
6792         };
6793         struct nfs41_bind_conn_to_session_res res;
6794         struct rpc_message msg = {
6795                 .rpc_proc =
6796                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6797                 .rpc_argp = &args,
6798                 .rpc_resp = &res,
6799                 .rpc_cred = cred,
6800         };
6801
6802         dprintk("--> %s\n", __func__);
6803
6804         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
6805         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
6806                 args.dir = NFS4_CDFC4_FORE;
6807
6808         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
6809         trace_nfs4_bind_conn_to_session(clp, status);
6810         if (status == 0) {
6811                 if (memcmp(res.sessionid.data,
6812                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6813                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6814                         status = -EIO;
6815                         goto out;
6816                 }
6817                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
6818                         dprintk("NFS: %s: Unexpected direction from server\n",
6819                                 __func__);
6820                         status = -EIO;
6821                         goto out;
6822                 }
6823                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
6824                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6825                                 __func__);
6826                         status = -EIO;
6827                         goto out;
6828                 }
6829         }
6830 out:
6831         dprintk("<-- %s status= %d\n", __func__, status);
6832         return status;
6833 }
6834
6835 /*
6836  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6837  * and operations we'd like to see to enable certain features in the allow map
6838  */
6839 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6840         .how = SP4_MACH_CRED,
6841         .enforce.u.words = {
6842                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6843                       1 << (OP_EXCHANGE_ID - 32) |
6844                       1 << (OP_CREATE_SESSION - 32) |
6845                       1 << (OP_DESTROY_SESSION - 32) |
6846                       1 << (OP_DESTROY_CLIENTID - 32)
6847         },
6848         .allow.u.words = {
6849                 [0] = 1 << (OP_CLOSE) |
6850                       1 << (OP_LOCKU) |
6851                       1 << (OP_COMMIT),
6852                 [1] = 1 << (OP_SECINFO - 32) |
6853                       1 << (OP_SECINFO_NO_NAME - 32) |
6854                       1 << (OP_TEST_STATEID - 32) |
6855                       1 << (OP_FREE_STATEID - 32) |
6856                       1 << (OP_WRITE - 32)
6857         }
6858 };
6859
6860 /*
6861  * Select the state protection mode for client `clp' given the server results
6862  * from exchange_id in `sp'.
6863  *
6864  * Returns 0 on success, negative errno otherwise.
6865  */
6866 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6867                                  struct nfs41_state_protection *sp)
6868 {
6869         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6870                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6871                       1 << (OP_EXCHANGE_ID - 32) |
6872                       1 << (OP_CREATE_SESSION - 32) |
6873                       1 << (OP_DESTROY_SESSION - 32) |
6874                       1 << (OP_DESTROY_CLIENTID - 32)
6875         };
6876         unsigned int i;
6877
6878         if (sp->how == SP4_MACH_CRED) {
6879                 /* Print state protect result */
6880                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6881                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6882                         if (test_bit(i, sp->enforce.u.longs))
6883                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6884                         if (test_bit(i, sp->allow.u.longs))
6885                                 dfprintk(MOUNT, "  allow op %d\n", i);
6886                 }
6887
6888                 /* make sure nothing is on enforce list that isn't supported */
6889                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6890                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6891                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6892                                 return -EINVAL;
6893                         }
6894                 }
6895
6896                 /*
6897                  * Minimal mode - state operations are allowed to use machine
6898                  * credential.  Note this already happens by default, so the
6899                  * client doesn't have to do anything more than the negotiation.
6900                  *
6901                  * NOTE: we don't care if EXCHANGE_ID is in the list -
6902                  *       we're already using the machine cred for exchange_id
6903                  *       and will never use a different cred.
6904                  */
6905                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
6906                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
6907                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
6908                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
6909                         dfprintk(MOUNT, "sp4_mach_cred:\n");
6910                         dfprintk(MOUNT, "  minimal mode enabled\n");
6911                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
6912                 } else {
6913                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6914                         return -EINVAL;
6915                 }
6916
6917                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
6918                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
6919                         dfprintk(MOUNT, "  cleanup mode enabled\n");
6920                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
6921                 }
6922
6923                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
6924                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
6925                         dfprintk(MOUNT, "  secinfo mode enabled\n");
6926                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
6927                 }
6928
6929                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
6930                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
6931                         dfprintk(MOUNT, "  stateid mode enabled\n");
6932                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
6933                 }
6934
6935                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
6936                         dfprintk(MOUNT, "  write mode enabled\n");
6937                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
6938                 }
6939
6940                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
6941                         dfprintk(MOUNT, "  commit mode enabled\n");
6942                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
6943                 }
6944         }
6945
6946         return 0;
6947 }
6948
6949 /*
6950  * _nfs4_proc_exchange_id()
6951  *
6952  * Wrapper for EXCHANGE_ID operation.
6953  */
6954 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
6955         u32 sp4_how)
6956 {
6957         nfs4_verifier verifier;
6958         struct nfs41_exchange_id_args args = {
6959                 .verifier = &verifier,
6960                 .client = clp,
6961 #ifdef CONFIG_NFS_V4_1_MIGRATION
6962                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6963                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
6964                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
6965 #else
6966                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
6967                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
6968 #endif
6969         };
6970         struct nfs41_exchange_id_res res = {
6971                 0
6972         };
6973         int status;
6974         struct rpc_message msg = {
6975                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
6976                 .rpc_argp = &args,
6977                 .rpc_resp = &res,
6978                 .rpc_cred = cred,
6979         };
6980
6981         nfs4_init_boot_verifier(clp, &verifier);
6982
6983         status = nfs4_init_uniform_client_string(clp);
6984         if (status)
6985                 goto out;
6986
6987         dprintk("NFS call  exchange_id auth=%s, '%s'\n",
6988                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
6989                 clp->cl_owner_id);
6990
6991         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
6992                                         GFP_NOFS);
6993         if (unlikely(res.server_owner == NULL)) {
6994                 status = -ENOMEM;
6995                 goto out;
6996         }
6997
6998         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
6999                                         GFP_NOFS);
7000         if (unlikely(res.server_scope == NULL)) {
7001                 status = -ENOMEM;
7002                 goto out_server_owner;
7003         }
7004
7005         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
7006         if (unlikely(res.impl_id == NULL)) {
7007                 status = -ENOMEM;
7008                 goto out_server_scope;
7009         }
7010
7011         switch (sp4_how) {
7012         case SP4_NONE:
7013                 args.state_protect.how = SP4_NONE;
7014                 break;
7015
7016         case SP4_MACH_CRED:
7017                 args.state_protect = nfs4_sp4_mach_cred_request;
7018                 break;
7019
7020         default:
7021                 /* unsupported! */
7022                 WARN_ON_ONCE(1);
7023                 status = -EINVAL;
7024                 goto out_impl_id;
7025         }
7026
7027         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7028         trace_nfs4_exchange_id(clp, status);
7029         if (status == 0)
7030                 status = nfs4_check_cl_exchange_flags(res.flags);
7031
7032         if (status == 0)
7033                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
7034
7035         if (status == 0) {
7036                 clp->cl_clientid = res.clientid;
7037                 clp->cl_exchange_flags = res.flags;
7038                 /* Client ID is not confirmed */
7039                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
7040                         clear_bit(NFS4_SESSION_ESTABLISHED,
7041                                         &clp->cl_session->session_state);
7042                         clp->cl_seqid = res.seqid;
7043                 }
7044
7045                 kfree(clp->cl_serverowner);
7046                 clp->cl_serverowner = res.server_owner;
7047                 res.server_owner = NULL;
7048
7049                 /* use the most recent implementation id */
7050                 kfree(clp->cl_implid);
7051                 clp->cl_implid = res.impl_id;
7052                 res.impl_id = NULL;
7053
7054                 if (clp->cl_serverscope != NULL &&
7055                     !nfs41_same_server_scope(clp->cl_serverscope,
7056                                              res.server_scope)) {
7057                         dprintk("%s: server_scope mismatch detected\n",
7058                                 __func__);
7059                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
7060                         kfree(clp->cl_serverscope);
7061                         clp->cl_serverscope = NULL;
7062                 }
7063
7064                 if (clp->cl_serverscope == NULL) {
7065                         clp->cl_serverscope = res.server_scope;
7066                         res.server_scope = NULL;
7067                 }
7068         }
7069
7070 out_impl_id:
7071         kfree(res.impl_id);
7072 out_server_scope:
7073         kfree(res.server_scope);
7074 out_server_owner:
7075         kfree(res.server_owner);
7076 out:
7077         if (clp->cl_implid != NULL)
7078                 dprintk("NFS reply exchange_id: Server Implementation ID: "
7079                         "domain: %s, name: %s, date: %llu,%u\n",
7080                         clp->cl_implid->domain, clp->cl_implid->name,
7081                         clp->cl_implid->date.seconds,
7082                         clp->cl_implid->date.nseconds);
7083         dprintk("NFS reply exchange_id: %d\n", status);
7084         return status;
7085 }
7086
7087 /*
7088  * nfs4_proc_exchange_id()
7089  *
7090  * Returns zero, a negative errno, or a negative NFS4ERR status code.
7091  *
7092  * Since the clientid has expired, all compounds using sessions
7093  * associated with the stale clientid will be returning
7094  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
7095  * be in some phase of session reset.
7096  *
7097  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
7098  */
7099 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
7100 {
7101         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
7102         int status;
7103
7104         /* try SP4_MACH_CRED if krb5i/p */
7105         if (authflavor == RPC_AUTH_GSS_KRB5I ||
7106             authflavor == RPC_AUTH_GSS_KRB5P) {
7107                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
7108                 if (!status)
7109                         return 0;
7110         }
7111
7112         /* try SP4_NONE */
7113         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
7114 }
7115
7116 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
7117                 struct rpc_cred *cred)
7118 {
7119         struct rpc_message msg = {
7120                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
7121                 .rpc_argp = clp,
7122                 .rpc_cred = cred,
7123         };
7124         int status;
7125
7126         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7127         trace_nfs4_destroy_clientid(clp, status);
7128         if (status)
7129                 dprintk("NFS: Got error %d from the server %s on "
7130                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
7131         return status;
7132 }
7133
7134 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
7135                 struct rpc_cred *cred)
7136 {
7137         unsigned int loop;
7138         int ret;
7139
7140         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
7141                 ret = _nfs4_proc_destroy_clientid(clp, cred);
7142                 switch (ret) {
7143                 case -NFS4ERR_DELAY:
7144                 case -NFS4ERR_CLIENTID_BUSY:
7145                         ssleep(1);
7146                         break;
7147                 default:
7148                         return ret;
7149                 }
7150         }
7151         return 0;
7152 }
7153
7154 int nfs4_destroy_clientid(struct nfs_client *clp)
7155 {
7156         struct rpc_cred *cred;
7157         int ret = 0;
7158
7159         if (clp->cl_mvops->minor_version < 1)
7160                 goto out;
7161         if (clp->cl_exchange_flags == 0)
7162                 goto out;
7163         if (clp->cl_preserve_clid)
7164                 goto out;
7165         cred = nfs4_get_clid_cred(clp);
7166         ret = nfs4_proc_destroy_clientid(clp, cred);
7167         if (cred)
7168                 put_rpccred(cred);
7169         switch (ret) {
7170         case 0:
7171         case -NFS4ERR_STALE_CLIENTID:
7172                 clp->cl_exchange_flags = 0;
7173         }
7174 out:
7175         return ret;
7176 }
7177
7178 struct nfs4_get_lease_time_data {
7179         struct nfs4_get_lease_time_args *args;
7180         struct nfs4_get_lease_time_res *res;
7181         struct nfs_client *clp;
7182 };
7183
7184 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7185                                         void *calldata)
7186 {
7187         struct nfs4_get_lease_time_data *data =
7188                         (struct nfs4_get_lease_time_data *)calldata;
7189
7190         dprintk("--> %s\n", __func__);
7191         /* just setup sequence, do not trigger session recovery
7192            since we're invoked within one */
7193         nfs41_setup_sequence(data->clp->cl_session,
7194                         &data->args->la_seq_args,
7195                         &data->res->lr_seq_res,
7196                         task);
7197         dprintk("<-- %s\n", __func__);
7198 }
7199
7200 /*
7201  * Called from nfs4_state_manager thread for session setup, so don't recover
7202  * from sequence operation or clientid errors.
7203  */
7204 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7205 {
7206         struct nfs4_get_lease_time_data *data =
7207                         (struct nfs4_get_lease_time_data *)calldata;
7208
7209         dprintk("--> %s\n", __func__);
7210         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7211                 return;
7212         switch (task->tk_status) {
7213         case -NFS4ERR_DELAY:
7214         case -NFS4ERR_GRACE:
7215                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7216                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7217                 task->tk_status = 0;
7218                 /* fall through */
7219         case -NFS4ERR_RETRY_UNCACHED_REP:
7220                 rpc_restart_call_prepare(task);
7221                 return;
7222         }
7223         dprintk("<-- %s\n", __func__);
7224 }
7225
7226 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7227         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7228         .rpc_call_done = nfs4_get_lease_time_done,
7229 };
7230
7231 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7232 {
7233         struct rpc_task *task;
7234         struct nfs4_get_lease_time_args args;
7235         struct nfs4_get_lease_time_res res = {
7236                 .lr_fsinfo = fsinfo,
7237         };
7238         struct nfs4_get_lease_time_data data = {
7239                 .args = &args,
7240                 .res = &res,
7241                 .clp = clp,
7242         };
7243         struct rpc_message msg = {
7244                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7245                 .rpc_argp = &args,
7246                 .rpc_resp = &res,
7247         };
7248         struct rpc_task_setup task_setup = {
7249                 .rpc_client = clp->cl_rpcclient,
7250                 .rpc_message = &msg,
7251                 .callback_ops = &nfs4_get_lease_time_ops,
7252                 .callback_data = &data,
7253                 .flags = RPC_TASK_TIMEOUT,
7254         };
7255         int status;
7256
7257         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7258         nfs4_set_sequence_privileged(&args.la_seq_args);
7259         dprintk("--> %s\n", __func__);
7260         task = rpc_run_task(&task_setup);
7261
7262         if (IS_ERR(task))
7263                 status = PTR_ERR(task);
7264         else {
7265                 status = task->tk_status;
7266                 rpc_put_task(task);
7267         }
7268         dprintk("<-- %s return %d\n", __func__, status);
7269
7270         return status;
7271 }
7272
7273 /*
7274  * Initialize the values to be used by the client in CREATE_SESSION
7275  * If nfs4_init_session set the fore channel request and response sizes,
7276  * use them.
7277  *
7278  * Set the back channel max_resp_sz_cached to zero to force the client to
7279  * always set csa_cachethis to FALSE because the current implementation
7280  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7281  */
7282 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args)
7283 {
7284         unsigned int max_rqst_sz, max_resp_sz;
7285
7286         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7287         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7288
7289         /* Fore channel attributes */
7290         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7291         args->fc_attrs.max_resp_sz = max_resp_sz;
7292         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7293         args->fc_attrs.max_reqs = max_session_slots;
7294
7295         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7296                 "max_ops=%u max_reqs=%u\n",
7297                 __func__,
7298                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7299                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7300
7301         /* Back channel attributes */
7302         args->bc_attrs.max_rqst_sz = PAGE_SIZE;
7303         args->bc_attrs.max_resp_sz = PAGE_SIZE;
7304         args->bc_attrs.max_resp_sz_cached = 0;
7305         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7306         args->bc_attrs.max_reqs = 1;
7307
7308         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7309                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7310                 __func__,
7311                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7312                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7313                 args->bc_attrs.max_reqs);
7314 }
7315
7316 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
7317                 struct nfs41_create_session_res *res)
7318 {
7319         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7320         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
7321
7322         if (rcvd->max_resp_sz > sent->max_resp_sz)
7323                 return -EINVAL;
7324         /*
7325          * Our requested max_ops is the minimum we need; we're not
7326          * prepared to break up compounds into smaller pieces than that.
7327          * So, no point even trying to continue if the server won't
7328          * cooperate:
7329          */
7330         if (rcvd->max_ops < sent->max_ops)
7331                 return -EINVAL;
7332         if (rcvd->max_reqs == 0)
7333                 return -EINVAL;
7334         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7335                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7336         return 0;
7337 }
7338
7339 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
7340                 struct nfs41_create_session_res *res)
7341 {
7342         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7343         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
7344
7345         if (!(res->flags & SESSION4_BACK_CHAN))
7346                 goto out;
7347         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7348                 return -EINVAL;
7349         if (rcvd->max_resp_sz < sent->max_resp_sz)
7350                 return -EINVAL;
7351         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7352                 return -EINVAL;
7353         /* These would render the backchannel useless: */
7354         if (rcvd->max_ops != sent->max_ops)
7355                 return -EINVAL;
7356         if (rcvd->max_reqs != sent->max_reqs)
7357                 return -EINVAL;
7358 out:
7359         return 0;
7360 }
7361
7362 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7363                                      struct nfs41_create_session_res *res)
7364 {
7365         int ret;
7366
7367         ret = nfs4_verify_fore_channel_attrs(args, res);
7368         if (ret)
7369                 return ret;
7370         return nfs4_verify_back_channel_attrs(args, res);
7371 }
7372
7373 static void nfs4_update_session(struct nfs4_session *session,
7374                 struct nfs41_create_session_res *res)
7375 {
7376         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
7377         /* Mark client id and session as being confirmed */
7378         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
7379         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
7380         session->flags = res->flags;
7381         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
7382         if (res->flags & SESSION4_BACK_CHAN)
7383                 memcpy(&session->bc_attrs, &res->bc_attrs,
7384                                 sizeof(session->bc_attrs));
7385 }
7386
7387 static int _nfs4_proc_create_session(struct nfs_client *clp,
7388                 struct rpc_cred *cred)
7389 {
7390         struct nfs4_session *session = clp->cl_session;
7391         struct nfs41_create_session_args args = {
7392                 .client = clp,
7393                 .clientid = clp->cl_clientid,
7394                 .seqid = clp->cl_seqid,
7395                 .cb_program = NFS4_CALLBACK,
7396         };
7397         struct nfs41_create_session_res res;
7398
7399         struct rpc_message msg = {
7400                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7401                 .rpc_argp = &args,
7402                 .rpc_resp = &res,
7403                 .rpc_cred = cred,
7404         };
7405         int status;
7406
7407         nfs4_init_channel_attrs(&args);
7408         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7409
7410         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7411         trace_nfs4_create_session(clp, status);
7412
7413         if (!status) {
7414                 /* Verify the session's negotiated channel_attrs values */
7415                 status = nfs4_verify_channel_attrs(&args, &res);
7416                 /* Increment the clientid slot sequence id */
7417                 if (clp->cl_seqid == res.seqid)
7418                         clp->cl_seqid++;
7419                 if (status)
7420                         goto out;
7421                 nfs4_update_session(session, &res);
7422         }
7423 out:
7424         return status;
7425 }
7426
7427 /*
7428  * Issues a CREATE_SESSION operation to the server.
7429  * It is the responsibility of the caller to verify the session is
7430  * expired before calling this routine.
7431  */
7432 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7433 {
7434         int status;
7435         unsigned *ptr;
7436         struct nfs4_session *session = clp->cl_session;
7437
7438         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7439
7440         status = _nfs4_proc_create_session(clp, cred);
7441         if (status)
7442                 goto out;
7443
7444         /* Init or reset the session slot tables */
7445         status = nfs4_setup_session_slot_tables(session);
7446         dprintk("slot table setup returned %d\n", status);
7447         if (status)
7448                 goto out;
7449
7450         ptr = (unsigned *)&session->sess_id.data[0];
7451         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7452                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7453 out:
7454         dprintk("<-- %s\n", __func__);
7455         return status;
7456 }
7457
7458 /*
7459  * Issue the over-the-wire RPC DESTROY_SESSION.
7460  * The caller must serialize access to this routine.
7461  */
7462 int nfs4_proc_destroy_session(struct nfs4_session *session,
7463                 struct rpc_cred *cred)
7464 {
7465         struct rpc_message msg = {
7466                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7467                 .rpc_argp = session,
7468                 .rpc_cred = cred,
7469         };
7470         int status = 0;
7471
7472         dprintk("--> nfs4_proc_destroy_session\n");
7473
7474         /* session is still being setup */
7475         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
7476                 return 0;
7477
7478         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7479         trace_nfs4_destroy_session(session->clp, status);
7480
7481         if (status)
7482                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7483                         "Session has been destroyed regardless...\n", status);
7484
7485         dprintk("<-- nfs4_proc_destroy_session\n");
7486         return status;
7487 }
7488
7489 /*
7490  * Renew the cl_session lease.
7491  */
7492 struct nfs4_sequence_data {
7493         struct nfs_client *clp;
7494         struct nfs4_sequence_args args;
7495         struct nfs4_sequence_res res;
7496 };
7497
7498 static void nfs41_sequence_release(void *data)
7499 {
7500         struct nfs4_sequence_data *calldata = data;
7501         struct nfs_client *clp = calldata->clp;
7502
7503         if (atomic_read(&clp->cl_count) > 1)
7504                 nfs4_schedule_state_renewal(clp);
7505         nfs_put_client(clp);
7506         kfree(calldata);
7507 }
7508
7509 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7510 {
7511         switch(task->tk_status) {
7512         case -NFS4ERR_DELAY:
7513                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7514                 return -EAGAIN;
7515         default:
7516                 nfs4_schedule_lease_recovery(clp);
7517         }
7518         return 0;
7519 }
7520
7521 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7522 {
7523         struct nfs4_sequence_data *calldata = data;
7524         struct nfs_client *clp = calldata->clp;
7525
7526         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7527                 return;
7528
7529         trace_nfs4_sequence(clp, task->tk_status);
7530         if (task->tk_status < 0) {
7531                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7532                 if (atomic_read(&clp->cl_count) == 1)
7533                         goto out;
7534
7535                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7536                         rpc_restart_call_prepare(task);
7537                         return;
7538                 }
7539         }
7540         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7541 out:
7542         dprintk("<-- %s\n", __func__);
7543 }
7544
7545 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7546 {
7547         struct nfs4_sequence_data *calldata = data;
7548         struct nfs_client *clp = calldata->clp;
7549         struct nfs4_sequence_args *args;
7550         struct nfs4_sequence_res *res;
7551
7552         args = task->tk_msg.rpc_argp;
7553         res = task->tk_msg.rpc_resp;
7554
7555         nfs41_setup_sequence(clp->cl_session, args, res, task);
7556 }
7557
7558 static const struct rpc_call_ops nfs41_sequence_ops = {
7559         .rpc_call_done = nfs41_sequence_call_done,
7560         .rpc_call_prepare = nfs41_sequence_prepare,
7561         .rpc_release = nfs41_sequence_release,
7562 };
7563
7564 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7565                 struct rpc_cred *cred,
7566                 bool is_privileged)
7567 {
7568         struct nfs4_sequence_data *calldata;
7569         struct rpc_message msg = {
7570                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7571                 .rpc_cred = cred,
7572         };
7573         struct rpc_task_setup task_setup_data = {
7574                 .rpc_client = clp->cl_rpcclient,
7575                 .rpc_message = &msg,
7576                 .callback_ops = &nfs41_sequence_ops,
7577                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7578         };
7579
7580         if (!atomic_inc_not_zero(&clp->cl_count))
7581                 return ERR_PTR(-EIO);
7582         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7583         if (calldata == NULL) {
7584                 nfs_put_client(clp);
7585                 return ERR_PTR(-ENOMEM);
7586         }
7587         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7588         if (is_privileged)
7589                 nfs4_set_sequence_privileged(&calldata->args);
7590         msg.rpc_argp = &calldata->args;
7591         msg.rpc_resp = &calldata->res;
7592         calldata->clp = clp;
7593         task_setup_data.callback_data = calldata;
7594
7595         return rpc_run_task(&task_setup_data);
7596 }
7597
7598 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7599 {
7600         struct rpc_task *task;
7601         int ret = 0;
7602
7603         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7604                 return -EAGAIN;
7605         task = _nfs41_proc_sequence(clp, cred, false);
7606         if (IS_ERR(task))
7607                 ret = PTR_ERR(task);
7608         else
7609                 rpc_put_task_async(task);
7610         dprintk("<-- %s status=%d\n", __func__, ret);
7611         return ret;
7612 }
7613
7614 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7615 {
7616         struct rpc_task *task;
7617         int ret;
7618
7619         task = _nfs41_proc_sequence(clp, cred, true);
7620         if (IS_ERR(task)) {
7621                 ret = PTR_ERR(task);
7622                 goto out;
7623         }
7624         ret = rpc_wait_for_completion_task(task);
7625         if (!ret)
7626                 ret = task->tk_status;
7627         rpc_put_task(task);
7628 out:
7629         dprintk("<-- %s status=%d\n", __func__, ret);
7630         return ret;
7631 }
7632
7633 struct nfs4_reclaim_complete_data {
7634         struct nfs_client *clp;
7635         struct nfs41_reclaim_complete_args arg;
7636         struct nfs41_reclaim_complete_res res;
7637 };
7638
7639 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7640 {
7641         struct nfs4_reclaim_complete_data *calldata = data;
7642
7643         nfs41_setup_sequence(calldata->clp->cl_session,
7644                         &calldata->arg.seq_args,
7645                         &calldata->res.seq_res,
7646                         task);
7647 }
7648
7649 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7650 {
7651         switch(task->tk_status) {
7652         case 0:
7653         case -NFS4ERR_COMPLETE_ALREADY:
7654         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7655                 break;
7656         case -NFS4ERR_DELAY:
7657                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7658                 /* fall through */
7659         case -NFS4ERR_RETRY_UNCACHED_REP:
7660                 return -EAGAIN;
7661         default:
7662                 nfs4_schedule_lease_recovery(clp);
7663         }
7664         return 0;
7665 }
7666
7667 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7668 {
7669         struct nfs4_reclaim_complete_data *calldata = data;
7670         struct nfs_client *clp = calldata->clp;
7671         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7672
7673         dprintk("--> %s\n", __func__);
7674         if (!nfs41_sequence_done(task, res))
7675                 return;
7676
7677         trace_nfs4_reclaim_complete(clp, task->tk_status);
7678         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7679                 rpc_restart_call_prepare(task);
7680                 return;
7681         }
7682         dprintk("<-- %s\n", __func__);
7683 }
7684
7685 static void nfs4_free_reclaim_complete_data(void *data)
7686 {
7687         struct nfs4_reclaim_complete_data *calldata = data;
7688
7689         kfree(calldata);
7690 }
7691
7692 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7693         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7694         .rpc_call_done = nfs4_reclaim_complete_done,
7695         .rpc_release = nfs4_free_reclaim_complete_data,
7696 };
7697
7698 /*
7699  * Issue a global reclaim complete.
7700  */
7701 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7702                 struct rpc_cred *cred)
7703 {
7704         struct nfs4_reclaim_complete_data *calldata;
7705         struct rpc_task *task;
7706         struct rpc_message msg = {
7707                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7708                 .rpc_cred = cred,
7709         };
7710         struct rpc_task_setup task_setup_data = {
7711                 .rpc_client = clp->cl_rpcclient,
7712                 .rpc_message = &msg,
7713                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7714                 .flags = RPC_TASK_ASYNC,
7715         };
7716         int status = -ENOMEM;
7717
7718         dprintk("--> %s\n", __func__);
7719         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7720         if (calldata == NULL)
7721                 goto out;
7722         calldata->clp = clp;
7723         calldata->arg.one_fs = 0;
7724
7725         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7726         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7727         msg.rpc_argp = &calldata->arg;
7728         msg.rpc_resp = &calldata->res;
7729         task_setup_data.callback_data = calldata;
7730         task = rpc_run_task(&task_setup_data);
7731         if (IS_ERR(task)) {
7732                 status = PTR_ERR(task);
7733                 goto out;
7734         }
7735         status = nfs4_wait_for_completion_rpc_task(task);
7736         if (status == 0)
7737                 status = task->tk_status;
7738         rpc_put_task(task);
7739         return 0;
7740 out:
7741         dprintk("<-- %s status=%d\n", __func__, status);
7742         return status;
7743 }
7744
7745 static void
7746 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7747 {
7748         struct nfs4_layoutget *lgp = calldata;
7749         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7750         struct nfs4_session *session = nfs4_get_session(server);
7751
7752         dprintk("--> %s\n", __func__);
7753         /* Note the is a race here, where a CB_LAYOUTRECALL can come in
7754          * right now covering the LAYOUTGET we are about to send.
7755          * However, that is not so catastrophic, and there seems
7756          * to be no way to prevent it completely.
7757          */
7758         if (nfs41_setup_sequence(session, &lgp->args.seq_args,
7759                                 &lgp->res.seq_res, task))
7760                 return;
7761         if (pnfs_choose_layoutget_stateid(&lgp->args.stateid,
7762                                           NFS_I(lgp->args.inode)->layout,
7763                                           &lgp->args.range,
7764                                           lgp->args.ctx->state)) {
7765                 rpc_exit(task, NFS4_OK);
7766         }
7767 }
7768
7769 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7770 {
7771         struct nfs4_layoutget *lgp = calldata;
7772         struct inode *inode = lgp->args.inode;
7773         struct nfs_server *server = NFS_SERVER(inode);
7774         struct pnfs_layout_hdr *lo;
7775         struct nfs4_state *state = NULL;
7776         unsigned long timeo, now, giveup;
7777
7778         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7779
7780         if (!nfs41_sequence_done(task, &lgp->res.seq_res))
7781                 goto out;
7782
7783         switch (task->tk_status) {
7784         case 0:
7785                 goto out;
7786         /*
7787          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
7788          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
7789          */
7790         case -NFS4ERR_BADLAYOUT:
7791                 goto out_overflow;
7792         /*
7793          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7794          * (or clients) writing to the same RAID stripe except when
7795          * the minlength argument is 0 (see RFC5661 section 18.43.3).
7796          */
7797         case -NFS4ERR_LAYOUTTRYLATER:
7798                 if (lgp->args.minlength == 0)
7799                         goto out_overflow;
7800         /*
7801          * NFS4ERR_RECALLCONFLICT is when conflict with self (must recall
7802          * existing layout before getting a new one).
7803          */
7804         case -NFS4ERR_RECALLCONFLICT:
7805                 timeo = rpc_get_timeout(task->tk_client);
7806                 giveup = lgp->args.timestamp + timeo;
7807                 now = jiffies;
7808                 if (time_after(giveup, now)) {
7809                         unsigned long delay;
7810
7811                         /* Delay for:
7812                          * - Not less then NFS4_POLL_RETRY_MIN.
7813                          * - One last time a jiffie before we give up
7814                          * - exponential backoff (time_now minus start_attempt)
7815                          */
7816                         delay = max_t(unsigned long, NFS4_POLL_RETRY_MIN,
7817                                     min((giveup - now - 1),
7818                                         now - lgp->args.timestamp));
7819
7820                         dprintk("%s: NFS4ERR_RECALLCONFLICT waiting %lu\n",
7821                                 __func__, delay);
7822                         rpc_delay(task, delay);
7823                         /* Do not call nfs4_async_handle_error() */
7824                         goto out_restart;
7825                 }
7826                 break;
7827         case -NFS4ERR_EXPIRED:
7828         case -NFS4ERR_BAD_STATEID:
7829                 spin_lock(&inode->i_lock);
7830                 if (nfs4_stateid_match(&lgp->args.stateid,
7831                                         &lgp->args.ctx->state->stateid)) {
7832                         spin_unlock(&inode->i_lock);
7833                         /* If the open stateid was bad, then recover it. */
7834                         state = lgp->args.ctx->state;
7835                         break;
7836                 }
7837                 lo = NFS_I(inode)->layout;
7838                 if (lo && nfs4_stateid_match(&lgp->args.stateid,
7839                                         &lo->plh_stateid)) {
7840                         LIST_HEAD(head);
7841
7842                         /*
7843                          * Mark the bad layout state as invalid, then retry
7844                          * with the current stateid.
7845                          */
7846                         set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
7847                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL);
7848                         spin_unlock(&inode->i_lock);
7849                         pnfs_free_lseg_list(&head);
7850                 } else
7851                         spin_unlock(&inode->i_lock);
7852                 goto out_restart;
7853         }
7854         if (nfs4_async_handle_error(task, server, state, &lgp->timeout) == -EAGAIN)
7855                 goto out_restart;
7856 out:
7857         dprintk("<-- %s\n", __func__);
7858         return;
7859 out_restart:
7860         task->tk_status = 0;
7861         rpc_restart_call_prepare(task);
7862         return;
7863 out_overflow:
7864         task->tk_status = -EOVERFLOW;
7865         goto out;
7866 }
7867
7868 static size_t max_response_pages(struct nfs_server *server)
7869 {
7870         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7871         return nfs_page_array_len(0, max_resp_sz);
7872 }
7873
7874 static void nfs4_free_pages(struct page **pages, size_t size)
7875 {
7876         int i;
7877
7878         if (!pages)
7879                 return;
7880
7881         for (i = 0; i < size; i++) {
7882                 if (!pages[i])
7883                         break;
7884                 __free_page(pages[i]);
7885         }
7886         kfree(pages);
7887 }
7888
7889 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7890 {
7891         struct page **pages;
7892         int i;
7893
7894         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7895         if (!pages) {
7896                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
7897                 return NULL;
7898         }
7899
7900         for (i = 0; i < size; i++) {
7901                 pages[i] = alloc_page(gfp_flags);
7902                 if (!pages[i]) {
7903                         dprintk("%s: failed to allocate page\n", __func__);
7904                         nfs4_free_pages(pages, size);
7905                         return NULL;
7906                 }
7907         }
7908
7909         return pages;
7910 }
7911
7912 static void nfs4_layoutget_release(void *calldata)
7913 {
7914         struct nfs4_layoutget *lgp = calldata;
7915         struct inode *inode = lgp->args.inode;
7916         struct nfs_server *server = NFS_SERVER(inode);
7917         size_t max_pages = max_response_pages(server);
7918
7919         dprintk("--> %s\n", __func__);
7920         nfs4_free_pages(lgp->args.layout.pages, max_pages);
7921         pnfs_put_layout_hdr(NFS_I(inode)->layout);
7922         put_nfs_open_context(lgp->args.ctx);
7923         kfree(calldata);
7924         dprintk("<-- %s\n", __func__);
7925 }
7926
7927 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
7928         .rpc_call_prepare = nfs4_layoutget_prepare,
7929         .rpc_call_done = nfs4_layoutget_done,
7930         .rpc_release = nfs4_layoutget_release,
7931 };
7932
7933 struct pnfs_layout_segment *
7934 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, gfp_t gfp_flags)
7935 {
7936         struct inode *inode = lgp->args.inode;
7937         struct nfs_server *server = NFS_SERVER(inode);
7938         size_t max_pages = max_response_pages(server);
7939         struct rpc_task *task;
7940         struct rpc_message msg = {
7941                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
7942                 .rpc_argp = &lgp->args,
7943                 .rpc_resp = &lgp->res,
7944                 .rpc_cred = lgp->cred,
7945         };
7946         struct rpc_task_setup task_setup_data = {
7947                 .rpc_client = server->client,
7948                 .rpc_message = &msg,
7949                 .callback_ops = &nfs4_layoutget_call_ops,
7950                 .callback_data = lgp,
7951                 .flags = RPC_TASK_ASYNC,
7952         };
7953         struct pnfs_layout_segment *lseg = NULL;
7954         int status = 0;
7955
7956         dprintk("--> %s\n", __func__);
7957
7958         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
7959         pnfs_get_layout_hdr(NFS_I(inode)->layout);
7960
7961         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
7962         if (!lgp->args.layout.pages) {
7963                 nfs4_layoutget_release(lgp);
7964                 return ERR_PTR(-ENOMEM);
7965         }
7966         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
7967         lgp->args.timestamp = jiffies;
7968
7969         lgp->res.layoutp = &lgp->args.layout;
7970         lgp->res.seq_res.sr_slot = NULL;
7971         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
7972
7973         task = rpc_run_task(&task_setup_data);
7974         if (IS_ERR(task))
7975                 return ERR_CAST(task);
7976         status = nfs4_wait_for_completion_rpc_task(task);
7977         if (status == 0)
7978                 status = task->tk_status;
7979         trace_nfs4_layoutget(lgp->args.ctx,
7980                         &lgp->args.range,
7981                         &lgp->res.range,
7982                         status);
7983         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
7984         if (status == 0 && lgp->res.layoutp->len)
7985                 lseg = pnfs_layout_process(lgp);
7986         rpc_put_task(task);
7987         dprintk("<-- %s status=%d\n", __func__, status);
7988         if (status)
7989                 return ERR_PTR(status);
7990         return lseg;
7991 }
7992
7993 static void
7994 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
7995 {
7996         struct nfs4_layoutreturn *lrp = calldata;
7997
7998         dprintk("--> %s\n", __func__);
7999         nfs41_setup_sequence(lrp->clp->cl_session,
8000                         &lrp->args.seq_args,
8001                         &lrp->res.seq_res,
8002                         task);
8003 }
8004
8005 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
8006 {
8007         struct nfs4_layoutreturn *lrp = calldata;
8008         struct nfs_server *server;
8009
8010         dprintk("--> %s\n", __func__);
8011
8012         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
8013                 return;
8014
8015         server = NFS_SERVER(lrp->args.inode);
8016         switch (task->tk_status) {
8017         default:
8018                 task->tk_status = 0;
8019         case 0:
8020                 break;
8021         case -NFS4ERR_DELAY:
8022                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
8023                         break;
8024                 rpc_restart_call_prepare(task);
8025                 return;
8026         }
8027         dprintk("<-- %s\n", __func__);
8028 }
8029
8030 static void nfs4_layoutreturn_release(void *calldata)
8031 {
8032         struct nfs4_layoutreturn *lrp = calldata;
8033         struct pnfs_layout_hdr *lo = lrp->args.layout;
8034         LIST_HEAD(freeme);
8035
8036         dprintk("--> %s\n", __func__);
8037         spin_lock(&lo->plh_inode->i_lock);
8038         if (lrp->res.lrs_present)
8039                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
8040         pnfs_mark_matching_lsegs_invalid(lo, &freeme, &lrp->args.range);
8041         pnfs_clear_layoutreturn_waitbit(lo);
8042         lo->plh_block_lgets--;
8043         spin_unlock(&lo->plh_inode->i_lock);
8044         pnfs_free_lseg_list(&freeme);
8045         pnfs_put_layout_hdr(lrp->args.layout);
8046         nfs_iput_and_deactive(lrp->inode);
8047         kfree(calldata);
8048         dprintk("<-- %s\n", __func__);
8049 }
8050
8051 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
8052         .rpc_call_prepare = nfs4_layoutreturn_prepare,
8053         .rpc_call_done = nfs4_layoutreturn_done,
8054         .rpc_release = nfs4_layoutreturn_release,
8055 };
8056
8057 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
8058 {
8059         struct rpc_task *task;
8060         struct rpc_message msg = {
8061                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
8062                 .rpc_argp = &lrp->args,
8063                 .rpc_resp = &lrp->res,
8064                 .rpc_cred = lrp->cred,
8065         };
8066         struct rpc_task_setup task_setup_data = {
8067                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
8068                 .rpc_message = &msg,
8069                 .callback_ops = &nfs4_layoutreturn_call_ops,
8070                 .callback_data = lrp,
8071         };
8072         int status = 0;
8073
8074         dprintk("--> %s\n", __func__);
8075         if (!sync) {
8076                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
8077                 if (!lrp->inode) {
8078                         nfs4_layoutreturn_release(lrp);
8079                         return -EAGAIN;
8080                 }
8081                 task_setup_data.flags |= RPC_TASK_ASYNC;
8082         }
8083         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
8084         task = rpc_run_task(&task_setup_data);
8085         if (IS_ERR(task))
8086                 return PTR_ERR(task);
8087         if (sync)
8088                 status = task->tk_status;
8089         trace_nfs4_layoutreturn(lrp->args.inode, status);
8090         dprintk("<-- %s status=%d\n", __func__, status);
8091         rpc_put_task(task);
8092         return status;
8093 }
8094
8095 static int
8096 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
8097                 struct pnfs_device *pdev,
8098                 struct rpc_cred *cred)
8099 {
8100         struct nfs4_getdeviceinfo_args args = {
8101                 .pdev = pdev,
8102                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
8103                         NOTIFY_DEVICEID4_DELETE,
8104         };
8105         struct nfs4_getdeviceinfo_res res = {
8106                 .pdev = pdev,
8107         };
8108         struct rpc_message msg = {
8109                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
8110                 .rpc_argp = &args,
8111                 .rpc_resp = &res,
8112                 .rpc_cred = cred,
8113         };
8114         int status;
8115
8116         dprintk("--> %s\n", __func__);
8117         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
8118         if (res.notification & ~args.notify_types)
8119                 dprintk("%s: unsupported notification\n", __func__);
8120         if (res.notification != args.notify_types)
8121                 pdev->nocache = 1;
8122
8123         dprintk("<-- %s status=%d\n", __func__, status);
8124
8125         return status;
8126 }
8127
8128 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
8129                 struct pnfs_device *pdev,
8130                 struct rpc_cred *cred)
8131 {
8132         struct nfs4_exception exception = { };
8133         int err;
8134
8135         do {
8136                 err = nfs4_handle_exception(server,
8137                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
8138                                         &exception);
8139         } while (exception.retry);
8140         return err;
8141 }
8142 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
8143
8144 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
8145 {
8146         struct nfs4_layoutcommit_data *data = calldata;
8147         struct nfs_server *server = NFS_SERVER(data->args.inode);
8148         struct nfs4_session *session = nfs4_get_session(server);
8149
8150         nfs41_setup_sequence(session,
8151                         &data->args.seq_args,
8152                         &data->res.seq_res,
8153                         task);
8154 }
8155
8156 static void
8157 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
8158 {
8159         struct nfs4_layoutcommit_data *data = calldata;
8160         struct nfs_server *server = NFS_SERVER(data->args.inode);
8161
8162         if (!nfs41_sequence_done(task, &data->res.seq_res))
8163                 return;
8164
8165         switch (task->tk_status) { /* Just ignore these failures */
8166         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
8167         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
8168         case -NFS4ERR_BADLAYOUT:     /* no layout */
8169         case -NFS4ERR_GRACE:        /* loca_recalim always false */
8170                 task->tk_status = 0;
8171         case 0:
8172                 break;
8173         default:
8174                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
8175                         rpc_restart_call_prepare(task);
8176                         return;
8177                 }
8178         }
8179 }
8180
8181 static void nfs4_layoutcommit_release(void *calldata)
8182 {
8183         struct nfs4_layoutcommit_data *data = calldata;
8184
8185         pnfs_cleanup_layoutcommit(data);
8186         nfs_post_op_update_inode_force_wcc(data->args.inode,
8187                                            data->res.fattr);
8188         put_rpccred(data->cred);
8189         nfs_iput_and_deactive(data->inode);
8190         kfree(data);
8191 }
8192
8193 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
8194         .rpc_call_prepare = nfs4_layoutcommit_prepare,
8195         .rpc_call_done = nfs4_layoutcommit_done,
8196         .rpc_release = nfs4_layoutcommit_release,
8197 };
8198
8199 int
8200 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
8201 {
8202         struct rpc_message msg = {
8203                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
8204                 .rpc_argp = &data->args,
8205                 .rpc_resp = &data->res,
8206                 .rpc_cred = data->cred,
8207         };
8208         struct rpc_task_setup task_setup_data = {
8209                 .task = &data->task,
8210                 .rpc_client = NFS_CLIENT(data->args.inode),
8211                 .rpc_message = &msg,
8212                 .callback_ops = &nfs4_layoutcommit_ops,
8213                 .callback_data = data,
8214         };
8215         struct rpc_task *task;
8216         int status = 0;
8217
8218         dprintk("NFS: initiating layoutcommit call. sync %d "
8219                 "lbw: %llu inode %lu\n", sync,
8220                 data->args.lastbytewritten,
8221                 data->args.inode->i_ino);
8222
8223         if (!sync) {
8224                 data->inode = nfs_igrab_and_active(data->args.inode);
8225                 if (data->inode == NULL) {
8226                         nfs4_layoutcommit_release(data);
8227                         return -EAGAIN;
8228                 }
8229                 task_setup_data.flags = RPC_TASK_ASYNC;
8230         }
8231         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8232         task = rpc_run_task(&task_setup_data);
8233         if (IS_ERR(task))
8234                 return PTR_ERR(task);
8235         if (sync)
8236                 status = task->tk_status;
8237         trace_nfs4_layoutcommit(data->args.inode, status);
8238         dprintk("%s: status %d\n", __func__, status);
8239         rpc_put_task(task);
8240         return status;
8241 }
8242
8243 /**
8244  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8245  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8246  */
8247 static int
8248 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8249                     struct nfs_fsinfo *info,
8250                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8251 {
8252         struct nfs41_secinfo_no_name_args args = {
8253                 .style = SECINFO_STYLE_CURRENT_FH,
8254         };
8255         struct nfs4_secinfo_res res = {
8256                 .flavors = flavors,
8257         };
8258         struct rpc_message msg = {
8259                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8260                 .rpc_argp = &args,
8261                 .rpc_resp = &res,
8262         };
8263         struct rpc_clnt *clnt = server->client;
8264         struct rpc_cred *cred = NULL;
8265         int status;
8266
8267         if (use_integrity) {
8268                 clnt = server->nfs_client->cl_rpcclient;
8269                 cred = nfs4_get_clid_cred(server->nfs_client);
8270                 msg.rpc_cred = cred;
8271         }
8272
8273         dprintk("--> %s\n", __func__);
8274         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8275                                 &res.seq_res, 0);
8276         dprintk("<-- %s status=%d\n", __func__, status);
8277
8278         if (cred)
8279                 put_rpccred(cred);
8280
8281         return status;
8282 }
8283
8284 static int
8285 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8286                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8287 {
8288         struct nfs4_exception exception = { };
8289         int err;
8290         do {
8291                 /* first try using integrity protection */
8292                 err = -NFS4ERR_WRONGSEC;
8293
8294                 /* try to use integrity protection with machine cred */
8295                 if (_nfs4_is_integrity_protected(server->nfs_client))
8296                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8297                                                           flavors, true);
8298
8299                 /*
8300                  * if unable to use integrity protection, or SECINFO with
8301                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8302                  * disallowed by spec, but exists in deployed servers) use
8303                  * the current filesystem's rpc_client and the user cred.
8304                  */
8305                 if (err == -NFS4ERR_WRONGSEC)
8306                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8307                                                           flavors, false);
8308
8309                 switch (err) {
8310                 case 0:
8311                 case -NFS4ERR_WRONGSEC:
8312                 case -ENOTSUPP:
8313                         goto out;
8314                 default:
8315                         err = nfs4_handle_exception(server, err, &exception);
8316                 }
8317         } while (exception.retry);
8318 out:
8319         return err;
8320 }
8321
8322 static int
8323 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8324                     struct nfs_fsinfo *info)
8325 {
8326         int err;
8327         struct page *page;
8328         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8329         struct nfs4_secinfo_flavors *flavors;
8330         struct nfs4_secinfo4 *secinfo;
8331         int i;
8332
8333         page = alloc_page(GFP_KERNEL);
8334         if (!page) {
8335                 err = -ENOMEM;
8336                 goto out;
8337         }
8338
8339         flavors = page_address(page);
8340         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8341
8342         /*
8343          * Fall back on "guess and check" method if
8344          * the server doesn't support SECINFO_NO_NAME
8345          */
8346         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8347                 err = nfs4_find_root_sec(server, fhandle, info);
8348                 goto out_freepage;
8349         }
8350         if (err)
8351                 goto out_freepage;
8352
8353         for (i = 0; i < flavors->num_flavors; i++) {
8354                 secinfo = &flavors->flavors[i];
8355
8356                 switch (secinfo->flavor) {
8357                 case RPC_AUTH_NULL:
8358                 case RPC_AUTH_UNIX:
8359                 case RPC_AUTH_GSS:
8360                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8361                                         &secinfo->flavor_info);
8362                         break;
8363                 default:
8364                         flavor = RPC_AUTH_MAXFLAVOR;
8365                         break;
8366                 }
8367
8368                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8369                         flavor = RPC_AUTH_MAXFLAVOR;
8370
8371                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8372                         err = nfs4_lookup_root_sec(server, fhandle,
8373                                                    info, flavor);
8374                         if (!err)
8375                                 break;
8376                 }
8377         }
8378
8379         if (flavor == RPC_AUTH_MAXFLAVOR)
8380                 err = -EPERM;
8381
8382 out_freepage:
8383         put_page(page);
8384         if (err == -EACCES)
8385                 return -EPERM;
8386 out:
8387         return err;
8388 }
8389
8390 static int _nfs41_test_stateid(struct nfs_server *server,
8391                 nfs4_stateid *stateid,
8392                 struct rpc_cred *cred)
8393 {
8394         int status;
8395         struct nfs41_test_stateid_args args = {
8396                 .stateid = stateid,
8397         };
8398         struct nfs41_test_stateid_res res;
8399         struct rpc_message msg = {
8400                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8401                 .rpc_argp = &args,
8402                 .rpc_resp = &res,
8403                 .rpc_cred = cred,
8404         };
8405         struct rpc_clnt *rpc_client = server->client;
8406
8407         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8408                 &rpc_client, &msg);
8409
8410         dprintk("NFS call  test_stateid %p\n", stateid);
8411         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8412         nfs4_set_sequence_privileged(&args.seq_args);
8413         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8414                         &args.seq_args, &res.seq_res);
8415         if (status != NFS_OK) {
8416                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8417                 return status;
8418         }
8419         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8420         return -res.status;
8421 }
8422
8423 /**
8424  * nfs41_test_stateid - perform a TEST_STATEID operation
8425  *
8426  * @server: server / transport on which to perform the operation
8427  * @stateid: state ID to test
8428  * @cred: credential
8429  *
8430  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8431  * Otherwise a negative NFS4ERR value is returned if the operation
8432  * failed or the state ID is not currently valid.
8433  */
8434 static int nfs41_test_stateid(struct nfs_server *server,
8435                 nfs4_stateid *stateid,
8436                 struct rpc_cred *cred)
8437 {
8438         struct nfs4_exception exception = { };
8439         int err;
8440         do {
8441                 err = _nfs41_test_stateid(server, stateid, cred);
8442                 if (err != -NFS4ERR_DELAY)
8443                         break;
8444                 nfs4_handle_exception(server, err, &exception);
8445         } while (exception.retry);
8446         return err;
8447 }
8448
8449 struct nfs_free_stateid_data {
8450         struct nfs_server *server;
8451         struct nfs41_free_stateid_args args;
8452         struct nfs41_free_stateid_res res;
8453 };
8454
8455 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8456 {
8457         struct nfs_free_stateid_data *data = calldata;
8458         nfs41_setup_sequence(nfs4_get_session(data->server),
8459                         &data->args.seq_args,
8460                         &data->res.seq_res,
8461                         task);
8462 }
8463
8464 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8465 {
8466         struct nfs_free_stateid_data *data = calldata;
8467
8468         nfs41_sequence_done(task, &data->res.seq_res);
8469
8470         switch (task->tk_status) {
8471         case -NFS4ERR_DELAY:
8472                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8473                         rpc_restart_call_prepare(task);
8474         }
8475 }
8476
8477 static void nfs41_free_stateid_release(void *calldata)
8478 {
8479         kfree(calldata);
8480 }
8481
8482 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8483         .rpc_call_prepare = nfs41_free_stateid_prepare,
8484         .rpc_call_done = nfs41_free_stateid_done,
8485         .rpc_release = nfs41_free_stateid_release,
8486 };
8487
8488 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8489                 nfs4_stateid *stateid,
8490                 struct rpc_cred *cred,
8491                 bool privileged)
8492 {
8493         struct rpc_message msg = {
8494                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8495                 .rpc_cred = cred,
8496         };
8497         struct rpc_task_setup task_setup = {
8498                 .rpc_client = server->client,
8499                 .rpc_message = &msg,
8500                 .callback_ops = &nfs41_free_stateid_ops,
8501                 .flags = RPC_TASK_ASYNC,
8502         };
8503         struct nfs_free_stateid_data *data;
8504
8505         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8506                 &task_setup.rpc_client, &msg);
8507
8508         dprintk("NFS call  free_stateid %p\n", stateid);
8509         data = kmalloc(sizeof(*data), GFP_NOFS);
8510         if (!data)
8511                 return ERR_PTR(-ENOMEM);
8512         data->server = server;
8513         nfs4_stateid_copy(&data->args.stateid, stateid);
8514
8515         task_setup.callback_data = data;
8516
8517         msg.rpc_argp = &data->args;
8518         msg.rpc_resp = &data->res;
8519         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8520         if (privileged)
8521                 nfs4_set_sequence_privileged(&data->args.seq_args);
8522
8523         return rpc_run_task(&task_setup);
8524 }
8525
8526 /**
8527  * nfs41_free_stateid - perform a FREE_STATEID operation
8528  *
8529  * @server: server / transport on which to perform the operation
8530  * @stateid: state ID to release
8531  * @cred: credential
8532  *
8533  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8534  * negative NFS4ERR value is returned.
8535  */
8536 static int nfs41_free_stateid(struct nfs_server *server,
8537                 nfs4_stateid *stateid,
8538                 struct rpc_cred *cred)
8539 {
8540         struct rpc_task *task;
8541         int ret;
8542
8543         task = _nfs41_free_stateid(server, stateid, cred, true);
8544         if (IS_ERR(task))
8545                 return PTR_ERR(task);
8546         ret = rpc_wait_for_completion_task(task);
8547         if (!ret)
8548                 ret = task->tk_status;
8549         rpc_put_task(task);
8550         return ret;
8551 }
8552
8553 static void
8554 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8555 {
8556         struct rpc_task *task;
8557         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8558
8559         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8560         nfs4_free_lock_state(server, lsp);
8561         if (IS_ERR(task))
8562                 return;
8563         rpc_put_task(task);
8564 }
8565
8566 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8567                 const nfs4_stateid *s2)
8568 {
8569         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8570                 return false;
8571
8572         if (s1->seqid == s2->seqid)
8573                 return true;
8574         if (s1->seqid == 0 || s2->seqid == 0)
8575                 return true;
8576
8577         return false;
8578 }
8579
8580 #endif /* CONFIG_NFS_V4_1 */
8581
8582 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8583                 const nfs4_stateid *s2)
8584 {
8585         return nfs4_stateid_match(s1, s2);
8586 }
8587
8588
8589 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8590         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8591         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8592         .recover_open   = nfs4_open_reclaim,
8593         .recover_lock   = nfs4_lock_reclaim,
8594         .establish_clid = nfs4_init_clientid,
8595         .detect_trunking = nfs40_discover_server_trunking,
8596 };
8597
8598 #if defined(CONFIG_NFS_V4_1)
8599 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8600         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8601         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8602         .recover_open   = nfs4_open_reclaim,
8603         .recover_lock   = nfs4_lock_reclaim,
8604         .establish_clid = nfs41_init_clientid,
8605         .reclaim_complete = nfs41_proc_reclaim_complete,
8606         .detect_trunking = nfs41_discover_server_trunking,
8607 };
8608 #endif /* CONFIG_NFS_V4_1 */
8609
8610 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8611         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8612         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8613         .recover_open   = nfs40_open_expired,
8614         .recover_lock   = nfs4_lock_expired,
8615         .establish_clid = nfs4_init_clientid,
8616 };
8617
8618 #if defined(CONFIG_NFS_V4_1)
8619 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8620         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8621         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8622         .recover_open   = nfs41_open_expired,
8623         .recover_lock   = nfs41_lock_expired,
8624         .establish_clid = nfs41_init_clientid,
8625 };
8626 #endif /* CONFIG_NFS_V4_1 */
8627
8628 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8629         .sched_state_renewal = nfs4_proc_async_renew,
8630         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8631         .renew_lease = nfs4_proc_renew,
8632 };
8633
8634 #if defined(CONFIG_NFS_V4_1)
8635 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8636         .sched_state_renewal = nfs41_proc_async_sequence,
8637         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8638         .renew_lease = nfs4_proc_sequence,
8639 };
8640 #endif
8641
8642 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8643         .get_locations = _nfs40_proc_get_locations,
8644         .fsid_present = _nfs40_proc_fsid_present,
8645 };
8646
8647 #if defined(CONFIG_NFS_V4_1)
8648 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8649         .get_locations = _nfs41_proc_get_locations,
8650         .fsid_present = _nfs41_proc_fsid_present,
8651 };
8652 #endif  /* CONFIG_NFS_V4_1 */
8653
8654 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8655         .minor_version = 0,
8656         .init_caps = NFS_CAP_READDIRPLUS
8657                 | NFS_CAP_ATOMIC_OPEN
8658                 | NFS_CAP_POSIX_LOCK,
8659         .init_client = nfs40_init_client,
8660         .shutdown_client = nfs40_shutdown_client,
8661         .match_stateid = nfs4_match_stateid,
8662         .find_root_sec = nfs4_find_root_sec,
8663         .free_lock_state = nfs4_release_lockowner,
8664         .alloc_seqid = nfs_alloc_seqid,
8665         .call_sync_ops = &nfs40_call_sync_ops,
8666         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8667         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8668         .state_renewal_ops = &nfs40_state_renewal_ops,
8669         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8670 };
8671
8672 #if defined(CONFIG_NFS_V4_1)
8673 static struct nfs_seqid *
8674 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
8675 {
8676         return NULL;
8677 }
8678
8679 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8680         .minor_version = 1,
8681         .init_caps = NFS_CAP_READDIRPLUS
8682                 | NFS_CAP_ATOMIC_OPEN
8683                 | NFS_CAP_POSIX_LOCK
8684                 | NFS_CAP_STATEID_NFSV41
8685                 | NFS_CAP_ATOMIC_OPEN_V1,
8686         .init_client = nfs41_init_client,
8687         .shutdown_client = nfs41_shutdown_client,
8688         .match_stateid = nfs41_match_stateid,
8689         .find_root_sec = nfs41_find_root_sec,
8690         .free_lock_state = nfs41_free_lock_state,
8691         .alloc_seqid = nfs_alloc_no_seqid,
8692         .call_sync_ops = &nfs41_call_sync_ops,
8693         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8694         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8695         .state_renewal_ops = &nfs41_state_renewal_ops,
8696         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8697 };
8698 #endif
8699
8700 #if defined(CONFIG_NFS_V4_2)
8701 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8702         .minor_version = 2,
8703         .init_caps = NFS_CAP_READDIRPLUS
8704                 | NFS_CAP_ATOMIC_OPEN
8705                 | NFS_CAP_POSIX_LOCK
8706                 | NFS_CAP_STATEID_NFSV41
8707                 | NFS_CAP_ATOMIC_OPEN_V1
8708                 | NFS_CAP_ALLOCATE
8709                 | NFS_CAP_DEALLOCATE
8710                 | NFS_CAP_SEEK
8711                 | NFS_CAP_LAYOUTSTATS
8712                 | NFS_CAP_CLONE,
8713         .init_client = nfs41_init_client,
8714         .shutdown_client = nfs41_shutdown_client,
8715         .match_stateid = nfs41_match_stateid,
8716         .find_root_sec = nfs41_find_root_sec,
8717         .free_lock_state = nfs41_free_lock_state,
8718         .call_sync_ops = &nfs41_call_sync_ops,
8719         .alloc_seqid = nfs_alloc_no_seqid,
8720         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8721         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8722         .state_renewal_ops = &nfs41_state_renewal_ops,
8723         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8724 };
8725 #endif
8726
8727 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8728         [0] = &nfs_v4_0_minor_ops,
8729 #if defined(CONFIG_NFS_V4_1)
8730         [1] = &nfs_v4_1_minor_ops,
8731 #endif
8732 #if defined(CONFIG_NFS_V4_2)
8733         [2] = &nfs_v4_2_minor_ops,
8734 #endif
8735 };
8736
8737 ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
8738 {
8739         ssize_t error, error2;
8740
8741         error = generic_listxattr(dentry, list, size);
8742         if (error < 0)
8743                 return error;
8744         if (list) {
8745                 list += error;
8746                 size -= error;
8747         }
8748
8749         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
8750         if (error2 < 0)
8751                 return error2;
8752         return error + error2;
8753 }
8754
8755 static const struct inode_operations nfs4_dir_inode_operations = {
8756         .create         = nfs_create,
8757         .lookup         = nfs_lookup,
8758         .atomic_open    = nfs_atomic_open,
8759         .link           = nfs_link,
8760         .unlink         = nfs_unlink,
8761         .symlink        = nfs_symlink,
8762         .mkdir          = nfs_mkdir,
8763         .rmdir          = nfs_rmdir,
8764         .mknod          = nfs_mknod,
8765         .rename         = nfs_rename,
8766         .permission     = nfs_permission,
8767         .getattr        = nfs_getattr,
8768         .setattr        = nfs_setattr,
8769         .getxattr       = generic_getxattr,
8770         .setxattr       = generic_setxattr,
8771         .listxattr      = nfs4_listxattr,
8772         .removexattr    = generic_removexattr,
8773 };
8774
8775 static const struct inode_operations nfs4_file_inode_operations = {
8776         .permission     = nfs_permission,
8777         .getattr        = nfs_getattr,
8778         .setattr        = nfs_setattr,
8779         .getxattr       = generic_getxattr,
8780         .setxattr       = generic_setxattr,
8781         .listxattr      = nfs4_listxattr,
8782         .removexattr    = generic_removexattr,
8783 };
8784
8785 const struct nfs_rpc_ops nfs_v4_clientops = {
8786         .version        = 4,                    /* protocol version */
8787         .dentry_ops     = &nfs4_dentry_operations,
8788         .dir_inode_ops  = &nfs4_dir_inode_operations,
8789         .file_inode_ops = &nfs4_file_inode_operations,
8790         .file_ops       = &nfs4_file_operations,
8791         .getroot        = nfs4_proc_get_root,
8792         .submount       = nfs4_submount,
8793         .try_mount      = nfs4_try_mount,
8794         .getattr        = nfs4_proc_getattr,
8795         .setattr        = nfs4_proc_setattr,
8796         .lookup         = nfs4_proc_lookup,
8797         .access         = nfs4_proc_access,
8798         .readlink       = nfs4_proc_readlink,
8799         .create         = nfs4_proc_create,
8800         .remove         = nfs4_proc_remove,
8801         .unlink_setup   = nfs4_proc_unlink_setup,
8802         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8803         .unlink_done    = nfs4_proc_unlink_done,
8804         .rename_setup   = nfs4_proc_rename_setup,
8805         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8806         .rename_done    = nfs4_proc_rename_done,
8807         .link           = nfs4_proc_link,
8808         .symlink        = nfs4_proc_symlink,
8809         .mkdir          = nfs4_proc_mkdir,
8810         .rmdir          = nfs4_proc_remove,
8811         .readdir        = nfs4_proc_readdir,
8812         .mknod          = nfs4_proc_mknod,
8813         .statfs         = nfs4_proc_statfs,
8814         .fsinfo         = nfs4_proc_fsinfo,
8815         .pathconf       = nfs4_proc_pathconf,
8816         .set_capabilities = nfs4_server_capabilities,
8817         .decode_dirent  = nfs4_decode_dirent,
8818         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8819         .read_setup     = nfs4_proc_read_setup,
8820         .read_done      = nfs4_read_done,
8821         .write_setup    = nfs4_proc_write_setup,
8822         .write_done     = nfs4_write_done,
8823         .commit_setup   = nfs4_proc_commit_setup,
8824         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8825         .commit_done    = nfs4_commit_done,
8826         .lock           = nfs4_proc_lock,
8827         .clear_acl_cache = nfs4_zap_acl_attr,
8828         .close_context  = nfs4_close_context,
8829         .open_context   = nfs4_atomic_open,
8830         .have_delegation = nfs4_have_delegation,
8831         .return_delegation = nfs4_inode_return_delegation,
8832         .alloc_client   = nfs4_alloc_client,
8833         .init_client    = nfs4_init_client,
8834         .free_client    = nfs4_free_client,
8835         .create_server  = nfs4_create_server,
8836         .clone_server   = nfs_clone_server,
8837 };
8838
8839 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8840         .name   = XATTR_NAME_NFSV4_ACL,
8841         .list   = nfs4_xattr_list_nfs4_acl,
8842         .get    = nfs4_xattr_get_nfs4_acl,
8843         .set    = nfs4_xattr_set_nfs4_acl,
8844 };
8845
8846 const struct xattr_handler *nfs4_xattr_handlers[] = {
8847         &nfs4_xattr_nfs4_acl_handler,
8848 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8849         &nfs4_xattr_nfs4_label_handler,
8850 #endif
8851         NULL
8852 };
8853
8854 /*
8855  * Local variables:
8856  *  c-basic-offset: 8
8857  * End:
8858  */