fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/file.h>
  42 #include <linux/string.h>
  43 #include <linux/ratelimit.h>
  44 #include <linux/printk.h>
  45 #include <linux/slab.h>
  46 #include <linux/sunrpc/clnt.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4idmap.h"
  67 #include "nfs4session.h"
  68 #include "fscache.h"
  69
  70 #include "nfs4trace.h"
  71
  72 #define NFSDBG_FACILITY         NFSDBG_PROC
  73
  74 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  75 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  76
  77 /* file attributes which can be mapped to nfs attributes */
  78 #define NFS4_VALID_ATTRS (ATTR_MODE \
  79         | ATTR_UID \
  80         | ATTR_GID \
  81         | ATTR_SIZE \
  82         | ATTR_ATIME \
  83         | ATTR_MTIME \
  84         | ATTR_CTIME \
  85         | ATTR_ATIME_SET \
  86         | ATTR_MTIME_SET)
  87
  88 struct nfs4_opendata;
  89 static int _nfs4_proc_open(struct nfs4_opendata *data);
  90 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  91 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  92 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  93 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  94 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  95 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  96                             struct nfs_fattr *fattr, struct iattr *sattr,
  97                             struct nfs4_state *state, struct nfs4_label *ilabel,
  98                             struct nfs4_label *olabel);
  99 #ifdef CONFIG_NFS_V4_1
 100 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 101                 struct rpc_cred *);
 102 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
 103                 struct rpc_cred *);
 104 #endif
 105
 106 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 107 static inline struct nfs4_label *
 108 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 109         struct iattr *sattr, struct nfs4_label *label)
 110 {
 111         int err;
 112
 113         if (label == NULL)
 114                 return NULL;
 115
 116         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 117                 return NULL;
 118
 119         err = security_dentry_init_security(dentry, sattr->ia_mode,
 120                                 &dentry->d_name, (void **)&label->label, &label->len);
 121         if (err == 0)
 122                 return label;
 123
 124         return NULL;
 125 }
 126 static inline void
 127 nfs4_label_release_security(struct nfs4_label *label)
 128 {
 129         if (label)
 130                 security_release_secctx(label->label, label->len);
 131 }
 132 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 133 {
 134         if (label)
 135                 return server->attr_bitmask;
 136
 137         return server->attr_bitmask_nl;
 138 }
 139 #else
 140 static inline struct nfs4_label *
 141 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 142         struct iattr *sattr, struct nfs4_label *l)
 143 { return NULL; }
 144 static inline void
 145 nfs4_label_release_security(struct nfs4_label *label)
 146 { return; }
 147 static inline u32 *
 148 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 149 { return server->attr_bitmask; }
 150 #endif
 151
 152 /* Prevent leaks of NFSv4 errors into userland */
 153 static int nfs4_map_errors(int err)
 154 {
 155         if (err >= -1000)
 156                 return err;
 157         switch (err) {
 158         case -NFS4ERR_RESOURCE:
 159         case -NFS4ERR_LAYOUTTRYLATER:
 160         case -NFS4ERR_RECALLCONFLICT:
 161                 return -EREMOTEIO;
 162         case -NFS4ERR_WRONGSEC:
 163         case -NFS4ERR_WRONG_CRED:
 164                 return -EPERM;
 165         case -NFS4ERR_BADOWNER:
 166         case -NFS4ERR_BADNAME:
 167                 return -EINVAL;
 168         case -NFS4ERR_SHARE_DENIED:
 169                 return -EACCES;
 170         case -NFS4ERR_MINOR_VERS_MISMATCH:
 171                 return -EPROTONOSUPPORT;
 172         case -NFS4ERR_FILE_OPEN:
 173                 return -EBUSY;
 174         default:
 175                 dprintk("%s could not handle NFSv4 error %d\n",
 176                                 __func__, -err);
 177                 break;
 178         }
 179         return -EIO;
 180 }
 181
 182 /*
 183  * This is our standard bitmap for GETATTR requests.
 184  */
 185 const u32 nfs4_fattr_bitmap[3] = {
 186         FATTR4_WORD0_TYPE
 187         | FATTR4_WORD0_CHANGE
 188         | FATTR4_WORD0_SIZE
 189         | FATTR4_WORD0_FSID
 190         | FATTR4_WORD0_FILEID,
 191         FATTR4_WORD1_MODE
 192         | FATTR4_WORD1_NUMLINKS
 193         | FATTR4_WORD1_OWNER
 194         | FATTR4_WORD1_OWNER_GROUP
 195         | FATTR4_WORD1_RAWDEV
 196         | FATTR4_WORD1_SPACE_USED
 197         | FATTR4_WORD1_TIME_ACCESS
 198         | FATTR4_WORD1_TIME_METADATA
 199         | FATTR4_WORD1_TIME_MODIFY
 200         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 201 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 202         FATTR4_WORD2_SECURITY_LABEL
 203 #endif
 204 };
 205
 206 static const u32 nfs4_pnfs_open_bitmap[3] = {
 207         FATTR4_WORD0_TYPE
 208         | FATTR4_WORD0_CHANGE
 209         | FATTR4_WORD0_SIZE
 210         | FATTR4_WORD0_FSID
 211         | FATTR4_WORD0_FILEID,
 212         FATTR4_WORD1_MODE
 213         | FATTR4_WORD1_NUMLINKS
 214         | FATTR4_WORD1_OWNER
 215         | FATTR4_WORD1_OWNER_GROUP
 216         | FATTR4_WORD1_RAWDEV
 217         | FATTR4_WORD1_SPACE_USED
 218         | FATTR4_WORD1_TIME_ACCESS
 219         | FATTR4_WORD1_TIME_METADATA
 220         | FATTR4_WORD1_TIME_MODIFY,
 221         FATTR4_WORD2_MDSTHRESHOLD
 222 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 223         | FATTR4_WORD2_SECURITY_LABEL
 224 #endif
 225 };
 226
 227 static const u32 nfs4_open_noattr_bitmap[3] = {
 228         FATTR4_WORD0_TYPE
 229         | FATTR4_WORD0_CHANGE
 230         | FATTR4_WORD0_FILEID,
 231 };
 232
 233 const u32 nfs4_statfs_bitmap[3] = {
 234         FATTR4_WORD0_FILES_AVAIL
 235         | FATTR4_WORD0_FILES_FREE
 236         | FATTR4_WORD0_FILES_TOTAL,
 237         FATTR4_WORD1_SPACE_AVAIL
 238         | FATTR4_WORD1_SPACE_FREE
 239         | FATTR4_WORD1_SPACE_TOTAL
 240 };
 241
 242 const u32 nfs4_pathconf_bitmap[3] = {
 243         FATTR4_WORD0_MAXLINK
 244         | FATTR4_WORD0_MAXNAME,
 245         0
 246 };
 247
 248 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 249                         | FATTR4_WORD0_MAXREAD
 250                         | FATTR4_WORD0_MAXWRITE
 251                         | FATTR4_WORD0_LEASE_TIME,
 252                         FATTR4_WORD1_TIME_DELTA
 253                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 254                         FATTR4_WORD2_LAYOUT_BLKSIZE
 255                         | FATTR4_WORD2_CLONE_BLKSIZE
 256 };
 257
 258 const u32 nfs4_fs_locations_bitmap[3] = {
 259         FATTR4_WORD0_TYPE
 260         | FATTR4_WORD0_CHANGE
 261         | FATTR4_WORD0_SIZE
 262         | FATTR4_WORD0_FSID
 263         | FATTR4_WORD0_FILEID
 264         | FATTR4_WORD0_FS_LOCATIONS,
 265         FATTR4_WORD1_MODE
 266         | FATTR4_WORD1_NUMLINKS
 267         | FATTR4_WORD1_OWNER
 268         | FATTR4_WORD1_OWNER_GROUP
 269         | FATTR4_WORD1_RAWDEV
 270         | FATTR4_WORD1_SPACE_USED
 271         | FATTR4_WORD1_TIME_ACCESS
 272         | FATTR4_WORD1_TIME_METADATA
 273         | FATTR4_WORD1_TIME_MODIFY
 274         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 275 };
 276
 277 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 278                 struct nfs4_readdir_arg *readdir)
 279 {
 280         __be32 *start, *p;
 281
 282         if (cookie > 2) {
 283                 readdir->cookie = cookie;
 284                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 285                 return;
 286         }
 287
 288         readdir->cookie = 0;
 289         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 290         if (cookie == 2)
 291                 return;
 292
 293         /*
 294          * NFSv4 servers do not return entries for '.' and '..'
 295          * Therefore, we fake these entries here.  We let '.'
 296          * have cookie 0 and '..' have cookie 1.  Note that
 297          * when talking to the server, we always send cookie 0
 298          * instead of 1 or 2.
 299          */
 300         start = p = kmap_atomic(*readdir->pages);
 301
 302         if (cookie == 0) {
 303                 *p++ = xdr_one;                                  /* next */
 304                 *p++ = xdr_zero;                   /* cookie, first word */
 305                 *p++ = xdr_one;                   /* cookie, second word */
 306                 *p++ = xdr_one;                             /* entry len */
 307                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 308                 p++;
 309                 *p++ = xdr_one;                         /* bitmap length */
 310                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 311                 *p++ = htonl(8);              /* attribute buffer length */
 312                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 313         }
 314
 315         *p++ = xdr_one;                                  /* next */
 316         *p++ = xdr_zero;                   /* cookie, first word */
 317         *p++ = xdr_two;                   /* cookie, second word */
 318         *p++ = xdr_two;                             /* entry len */
 319         memcpy(p, "..\0\0", 4);                         /* entry */
 320         p++;
 321         *p++ = xdr_one;                         /* bitmap length */
 322         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 323         *p++ = htonl(8);              /* attribute buffer length */
 324         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 325
 326         readdir->pgbase = (char *)p - (char *)start;
 327         readdir->count -= readdir->pgbase;
 328         kunmap_atomic(start);
 329 }
 330
 331 static long nfs4_update_delay(long *timeout)
 332 {
 333         long ret;
 334         if (!timeout)
 335                 return NFS4_POLL_RETRY_MAX;
 336         if (*timeout <= 0)
 337                 *timeout = NFS4_POLL_RETRY_MIN;
 338         if (*timeout > NFS4_POLL_RETRY_MAX)
 339                 *timeout = NFS4_POLL_RETRY_MAX;
 340         ret = *timeout;
 341         *timeout <<= 1;
 342         return ret;
 343 }
 344
 345 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 346 {
 347         int res = 0;
 348
 349         might_sleep();
 350
 351         freezable_schedule_timeout_killable_unsafe(
 352                 nfs4_update_delay(timeout));
 353         if (fatal_signal_pending(current))
 354                 res = -ERESTARTSYS;
 355         return res;
 356 }
 357
 358 /* This is the error handling routine for processes that are allowed
 359  * to sleep.
 360  */
 361 static int nfs4_do_handle_exception(struct nfs_server *server,
 362                 int errorcode, struct nfs4_exception *exception)
 363 {
 364         struct nfs_client *clp = server->nfs_client;
 365         struct nfs4_state *state = exception->state;
 366         const nfs4_stateid *stateid = exception->stateid;
 367         struct inode *inode = exception->inode;
 368         int ret = errorcode;
 369
 370         exception->delay = 0;
 371         exception->recovering = 0;
 372         exception->retry = 0;
 373         switch(errorcode) {
 374                 case 0:
 375                         return 0;
 376                 case -NFS4ERR_OPENMODE:
 377                 case -NFS4ERR_DELEG_REVOKED:
 378                 case -NFS4ERR_ADMIN_REVOKED:
 379                 case -NFS4ERR_BAD_STATEID:
 380                         if (inode) {
 381                                 int err;
 382
 383                                 err = nfs_async_inode_return_delegation(inode,
 384                                                 stateid);
 385                                 if (err == 0)
 386                                         goto wait_on_recovery;
 387                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 388                                         exception->retry = 1;
 389                                         break;
 390                                 }
 391                         }
 392                         if (state == NULL)
 393                                 break;
 394                         ret = nfs4_schedule_stateid_recovery(server, state);
 395                         if (ret < 0)
 396                                 break;
 397                         goto wait_on_recovery;
 398                 case -NFS4ERR_EXPIRED:
 399                         if (state != NULL) {
 400                                 ret = nfs4_schedule_stateid_recovery(server, state);
 401                                 if (ret < 0)
 402                                         break;
 403                         }
 404                 case -NFS4ERR_STALE_STATEID:
 405                 case -NFS4ERR_STALE_CLIENTID:
 406                         nfs4_schedule_lease_recovery(clp);
 407                         goto wait_on_recovery;
 408                 case -NFS4ERR_MOVED:
 409                         ret = nfs4_schedule_migration_recovery(server);
 410                         if (ret < 0)
 411                                 break;
 412                         goto wait_on_recovery;
 413                 case -NFS4ERR_LEASE_MOVED:
 414                         nfs4_schedule_lease_moved_recovery(clp);
 415                         goto wait_on_recovery;
 416 #if defined(CONFIG_NFS_V4_1)
 417                 case -NFS4ERR_BADSESSION:
 418                 case -NFS4ERR_BADSLOT:
 419                 case -NFS4ERR_BAD_HIGH_SLOT:
 420                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 421                 case -NFS4ERR_DEADSESSION:
 422                 case -NFS4ERR_SEQ_FALSE_RETRY:
 423                 case -NFS4ERR_SEQ_MISORDERED:
 424                         dprintk("%s ERROR: %d Reset session\n", __func__,
 425                                 errorcode);
 426                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 427                         goto wait_on_recovery;
 428 #endif /* defined(CONFIG_NFS_V4_1) */
 429                 case -NFS4ERR_FILE_OPEN:
 430                         if (exception->timeout > HZ) {
 431                                 /* We have retried a decent amount, time to
 432                                  * fail
 433                                  */
 434                                 ret = -EBUSY;
 435                                 break;
 436                         }
 437                 case -NFS4ERR_DELAY:
 438                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 439                 case -NFS4ERR_GRACE:
 440                 case -NFS4ERR_LAYOUTTRYLATER:
 441                 case -NFS4ERR_RECALLCONFLICT:
 442                         exception->delay = 1;
 443                         return 0;
 444
 445                 case -NFS4ERR_RETRY_UNCACHED_REP:
 446                 case -NFS4ERR_OLD_STATEID:
 447                         exception->retry = 1;
 448                         break;
 449                 case -NFS4ERR_BADOWNER:
 450                         /* The following works around a Linux server bug! */
 451                 case -NFS4ERR_BADNAME:
 452                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 453                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 454                                 exception->retry = 1;
 455                                 printk(KERN_WARNING "NFS: v4 server %s "
 456                                                 "does not accept raw "
 457                                                 "uid/gids. "
 458                                                 "Reenabling the idmapper.\n",
 459                                                 server->nfs_client->cl_hostname);
 460                         }
 461         }
 462         /* We failed to handle the error */
 463         return nfs4_map_errors(ret);
 464 wait_on_recovery:
 465         exception->recovering = 1;
 466         return 0;
 467 }
 468
 469 /* This is the error handling routine for processes that are allowed
 470  * to sleep.
 471  */
 472 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 473 {
 474         struct nfs_client *clp = server->nfs_client;
 475         int ret;
 476
 477         ret = nfs4_do_handle_exception(server, errorcode, exception);
 478         if (exception->delay) {
 479                 ret = nfs4_delay(server->client, &exception->timeout);
 480                 goto out_retry;
 481         }
 482         if (exception->recovering) {
 483                 ret = nfs4_wait_clnt_recover(clp);
 484                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 485                         return -EIO;
 486                 goto out_retry;
 487         }
 488         return ret;
 489 out_retry:
 490         if (ret == 0)
 491                 exception->retry = 1;
 492         return ret;
 493 }
 494
 495 static int
 496 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 497                 int errorcode, struct nfs4_exception *exception)
 498 {
 499         struct nfs_client *clp = server->nfs_client;
 500         int ret;
 501
 502         ret = nfs4_do_handle_exception(server, errorcode, exception);
 503         if (exception->delay) {
 504                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 505                 goto out_retry;
 506         }
 507         if (exception->recovering) {
 508                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 509                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 510                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 511                 goto out_retry;
 512         }
 513         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 514                 ret = -EIO;
 515         return ret;
 516 out_retry:
 517         if (ret == 0)
 518                 exception->retry = 1;
 519         return ret;
 520 }
 521
 522 static int
 523 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 524                         struct nfs4_state *state, long *timeout)
 525 {
 526         struct nfs4_exception exception = {
 527                 .state = state,
 528         };
 529
 530         if (task->tk_status >= 0)
 531                 return 0;
 532         if (timeout)
 533                 exception.timeout = *timeout;
 534         task->tk_status = nfs4_async_handle_exception(task, server,
 535                         task->tk_status,
 536                         &exception);
 537         if (exception.delay && timeout)
 538                 *timeout = exception.timeout;
 539         if (exception.retry)
 540                 return -EAGAIN;
 541         return 0;
 542 }
 543
 544 /*
 545  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 546  * or 'false' otherwise.
 547  */
 548 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 549 {
 550         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 551
 552         if (flavor == RPC_AUTH_GSS_KRB5I ||
 553             flavor == RPC_AUTH_GSS_KRB5P)
 554                 return true;
 555
 556         return false;
 557 }
 558
 559 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 560 {
 561         spin_lock(&clp->cl_lock);
 562         if (time_before(clp->cl_last_renewal,timestamp))
 563                 clp->cl_last_renewal = timestamp;
 564         spin_unlock(&clp->cl_lock);
 565 }
 566
 567 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 568 {
 569         struct nfs_client *clp = server->nfs_client;
 570
 571         if (!nfs4_has_session(clp))
 572                 do_renew_lease(clp, timestamp);
 573 }
 574
 575 struct nfs4_call_sync_data {
 576         const struct nfs_server *seq_server;
 577         struct nfs4_sequence_args *seq_args;
 578         struct nfs4_sequence_res *seq_res;
 579 };
 580
 581 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 582                         struct nfs4_sequence_res *res, int cache_reply)
 583 {
 584         args->sa_slot = NULL;
 585         args->sa_cache_this = cache_reply;
 586         args->sa_privileged = 0;
 587
 588         res->sr_slot = NULL;
 589 }
 590
 591 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 592 {
 593         args->sa_privileged = 1;
 594 }
 595
 596 int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 597                          struct nfs4_sequence_args *args,
 598                          struct nfs4_sequence_res *res,
 599                          struct rpc_task *task)
 600 {
 601         struct nfs4_slot *slot;
 602
 603         /* slot already allocated? */
 604         if (res->sr_slot != NULL)
 605                 goto out_start;
 606
 607         spin_lock(&tbl->slot_tbl_lock);
 608         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 609                 goto out_sleep;
 610
 611         slot = nfs4_alloc_slot(tbl);
 612         if (IS_ERR(slot)) {
 613                 if (slot == ERR_PTR(-ENOMEM))
 614                         task->tk_timeout = HZ >> 2;
 615                 goto out_sleep;
 616         }
 617         spin_unlock(&tbl->slot_tbl_lock);
 618
 619         slot->privileged = args->sa_privileged ? 1 : 0;
 620         args->sa_slot = slot;
 621         res->sr_slot = slot;
 622
 623 out_start:
 624         rpc_call_start(task);
 625         return 0;
 626
 627 out_sleep:
 628         if (args->sa_privileged)
 629                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 630                                 NULL, RPC_PRIORITY_PRIVILEGED);
 631         else
 632                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 633         spin_unlock(&tbl->slot_tbl_lock);
 634         return -EAGAIN;
 635 }
 636 EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
 637
 638 static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
 639 {
 640         struct nfs4_slot *slot = res->sr_slot;
 641         struct nfs4_slot_table *tbl;
 642
 643         tbl = slot->table;
 644         spin_lock(&tbl->slot_tbl_lock);
 645         if (!nfs41_wake_and_assign_slot(tbl, slot))
 646                 nfs4_free_slot(tbl, slot);
 647         spin_unlock(&tbl->slot_tbl_lock);
 648
 649         res->sr_slot = NULL;
 650 }
 651
 652 static int nfs40_sequence_done(struct rpc_task *task,
 653                                struct nfs4_sequence_res *res)
 654 {
 655         if (res->sr_slot != NULL)
 656                 nfs40_sequence_free_slot(res);
 657         return 1;
 658 }
 659
 660 #if defined(CONFIG_NFS_V4_1)
 661
 662 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 663 {
 664         struct nfs4_session *session;
 665         struct nfs4_slot_table *tbl;
 666         struct nfs4_slot *slot = res->sr_slot;
 667         bool send_new_highest_used_slotid = false;
 668
 669         tbl = slot->table;
 670         session = tbl->session;
 671
 672         /* Bump the slot sequence number */
 673         if (slot->seq_done)
 674                 slot->seq_nr++;
 675         slot->seq_done = 0;
 676
 677         spin_lock(&tbl->slot_tbl_lock);
 678         /* Be nice to the server: try to ensure that the last transmitted
 679          * value for highest_user_slotid <= target_highest_slotid
 680          */
 681         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 682                 send_new_highest_used_slotid = true;
 683
 684         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 685                 send_new_highest_used_slotid = false;
 686                 goto out_unlock;
 687         }
 688         nfs4_free_slot(tbl, slot);
 689
 690         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 691                 send_new_highest_used_slotid = false;
 692 out_unlock:
 693         spin_unlock(&tbl->slot_tbl_lock);
 694         res->sr_slot = NULL;
 695         if (send_new_highest_used_slotid)
 696                 nfs41_notify_server(session->clp);
 697         if (waitqueue_active(&tbl->slot_waitq))
 698                 wake_up_all(&tbl->slot_waitq);
 699 }
 700
 701 static int nfs41_sequence_process(struct rpc_task *task,
 702                 struct nfs4_sequence_res *res)
 703 {
 704         struct nfs4_session *session;
 705         struct nfs4_slot *slot = res->sr_slot;
 706         struct nfs_client *clp;
 707         bool interrupted = false;
 708         int ret = 1;
 709
 710         if (slot == NULL)
 711                 goto out_noaction;
 712         /* don't increment the sequence number if the task wasn't sent */
 713         if (!RPC_WAS_SENT(task))
 714                 goto out;
 715
 716         session = slot->table->session;
 717
 718         if (slot->interrupted) {
 719                 slot->interrupted = 0;
 720                 interrupted = true;
 721         }
 722
 723         trace_nfs4_sequence_done(session, res);
 724         /* Check the SEQUENCE operation status */
 725         switch (res->sr_status) {
 726         case 0:
 727                 /* Update the slot's sequence and clientid lease timer */
 728                 slot->seq_done = 1;
 729                 clp = session->clp;
 730                 do_renew_lease(clp, res->sr_timestamp);
 731                 /* Check sequence flags */
 732                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
 733                                 !!slot->privileged);
 734                 nfs41_update_target_slotid(slot->table, slot, res);
 735                 break;
 736         case 1:
 737                 /*
 738                  * sr_status remains 1 if an RPC level error occurred.
 739                  * The server may or may not have processed the sequence
 740                  * operation..
 741                  * Mark the slot as having hosted an interrupted RPC call.
 742                  */
 743                 slot->interrupted = 1;
 744                 goto out;
 745         case -NFS4ERR_DELAY:
 746                 /* The server detected a resend of the RPC call and
 747                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 748                  * of RFC5661.
 749                  */
 750                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 751                         __func__,
 752                         slot->slot_nr,
 753                         slot->seq_nr);
 754                 goto out_retry;
 755         case -NFS4ERR_BADSLOT:
 756                 /*
 757                  * The slot id we used was probably retired. Try again
 758                  * using a different slot id.
 759                  */
 760                 goto retry_nowait;
 761         case -NFS4ERR_SEQ_MISORDERED:
 762                 /*
 763                  * Was the last operation on this sequence interrupted?
 764                  * If so, retry after bumping the sequence number.
 765                  */
 766                 if (interrupted) {
 767                         ++slot->seq_nr;
 768                         goto retry_nowait;
 769                 }
 770                 /*
 771                  * Could this slot have been previously retired?
 772                  * If so, then the server may be expecting seq_nr = 1!
 773                  */
 774                 if (slot->seq_nr != 1) {
 775                         slot->seq_nr = 1;
 776                         goto retry_nowait;
 777                 }
 778                 break;
 779         case -NFS4ERR_SEQ_FALSE_RETRY:
 780                 ++slot->seq_nr;
 781                 goto retry_nowait;
 782         default:
 783                 /* Just update the slot sequence no. */
 784                 slot->seq_done = 1;
 785         }
 786 out:
 787         /* The session may be reset by one of the error handlers. */
 788         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 789 out_noaction:
 790         return ret;
 791 retry_nowait:
 792         if (rpc_restart_call_prepare(task)) {
 793                 nfs41_sequence_free_slot(res);
 794                 task->tk_status = 0;
 795                 ret = 0;
 796         }
 797         goto out;
 798 out_retry:
 799         if (!rpc_restart_call(task))
 800                 goto out;
 801         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 802         return 0;
 803 }
 804
 805 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 806 {
 807         if (!nfs41_sequence_process(task, res))
 808                 return 0;
 809         if (res->sr_slot != NULL)
 810                 nfs41_sequence_free_slot(res);
 811         return 1;
 812
 813 }
 814 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 815
 816 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 817 {
 818         if (res->sr_slot == NULL)
 819                 return 1;
 820         if (res->sr_slot->table->session != NULL)
 821                 return nfs41_sequence_process(task, res);
 822         return nfs40_sequence_done(task, res);
 823 }
 824
 825 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 826 {
 827         if (res->sr_slot != NULL) {
 828                 if (res->sr_slot->table->session != NULL)
 829                         nfs41_sequence_free_slot(res);
 830                 else
 831                         nfs40_sequence_free_slot(res);
 832         }
 833 }
 834
 835 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 836 {
 837         if (res->sr_slot == NULL)
 838                 return 1;
 839         if (!res->sr_slot->table->session)
 840                 return nfs40_sequence_done(task, res);
 841         return nfs41_sequence_done(task, res);
 842 }
 843 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 844
 845 int nfs41_setup_sequence(struct nfs4_session *session,
 846                                 struct nfs4_sequence_args *args,
 847                                 struct nfs4_sequence_res *res,
 848                                 struct rpc_task *task)
 849 {
 850         struct nfs4_slot *slot;
 851         struct nfs4_slot_table *tbl;
 852
 853         dprintk("--> %s\n", __func__);
 854         /* slot already allocated? */
 855         if (res->sr_slot != NULL)
 856                 goto out_success;
 857
 858         tbl = &session->fc_slot_table;
 859
 860         task->tk_timeout = 0;
 861
 862         spin_lock(&tbl->slot_tbl_lock);
 863         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 864             !args->sa_privileged) {
 865                 /* The state manager will wait until the slot table is empty */
 866                 dprintk("%s session is draining\n", __func__);
 867                 goto out_sleep;
 868         }
 869
 870         slot = nfs4_alloc_slot(tbl);
 871         if (IS_ERR(slot)) {
 872                 /* If out of memory, try again in 1/4 second */
 873                 if (slot == ERR_PTR(-ENOMEM))
 874                         task->tk_timeout = HZ >> 2;
 875                 dprintk("<-- %s: no free slots\n", __func__);
 876                 goto out_sleep;
 877         }
 878         spin_unlock(&tbl->slot_tbl_lock);
 879
 880         slot->privileged = args->sa_privileged ? 1 : 0;
 881         args->sa_slot = slot;
 882
 883         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 884                         slot->slot_nr, slot->seq_nr);
 885
 886         res->sr_slot = slot;
 887         res->sr_timestamp = jiffies;
 888         res->sr_status_flags = 0;
 889         /*
 890          * sr_status is only set in decode_sequence, and so will remain
 891          * set to 1 if an rpc level failure occurs.
 892          */
 893         res->sr_status = 1;
 894         trace_nfs4_setup_sequence(session, args);
 895 out_success:
 896         rpc_call_start(task);
 897         return 0;
 898 out_sleep:
 899         /* Privileged tasks are queued with top priority */
 900         if (args->sa_privileged)
 901                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 902                                 NULL, RPC_PRIORITY_PRIVILEGED);
 903         else
 904                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 905         spin_unlock(&tbl->slot_tbl_lock);
 906         return -EAGAIN;
 907 }
 908 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 909
 910 static int nfs4_setup_sequence(const struct nfs_server *server,
 911                                struct nfs4_sequence_args *args,
 912                                struct nfs4_sequence_res *res,
 913                                struct rpc_task *task)
 914 {
 915         struct nfs4_session *session = nfs4_get_session(server);
 916         int ret = 0;
 917
 918         if (!session)
 919                 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 920                                             args, res, task);
 921
 922         dprintk("--> %s clp %p session %p sr_slot %u\n",
 923                 __func__, session->clp, session, res->sr_slot ?
 924                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 925
 926         ret = nfs41_setup_sequence(session, args, res, task);
 927
 928         dprintk("<-- %s status=%d\n", __func__, ret);
 929         return ret;
 930 }
 931
 932 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 933 {
 934         struct nfs4_call_sync_data *data = calldata;
 935         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 936
 937         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 938
 939         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 940 }
 941
 942 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 943 {
 944         struct nfs4_call_sync_data *data = calldata;
 945
 946         nfs41_sequence_done(task, data->seq_res);
 947 }
 948
 949 static const struct rpc_call_ops nfs41_call_sync_ops = {
 950         .rpc_call_prepare = nfs41_call_sync_prepare,
 951         .rpc_call_done = nfs41_call_sync_done,
 952 };
 953
 954 #else   /* !CONFIG_NFS_V4_1 */
 955
 956 static int nfs4_setup_sequence(const struct nfs_server *server,
 957                                struct nfs4_sequence_args *args,
 958                                struct nfs4_sequence_res *res,
 959                                struct rpc_task *task)
 960 {
 961         return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 962                                     args, res, task);
 963 }
 964
 965 static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
 966 {
 967         return nfs40_sequence_done(task, res);
 968 }
 969
 970 static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
 971 {
 972         if (res->sr_slot != NULL)
 973                 nfs40_sequence_free_slot(res);
 974 }
 975
 976 int nfs4_sequence_done(struct rpc_task *task,
 977                        struct nfs4_sequence_res *res)
 978 {
 979         return nfs40_sequence_done(task, res);
 980 }
 981 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 982
 983 #endif  /* !CONFIG_NFS_V4_1 */
 984
 985 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 986 {
 987         struct nfs4_call_sync_data *data = calldata;
 988         nfs4_setup_sequence(data->seq_server,
 989                                 data->seq_args, data->seq_res, task);
 990 }
 991
 992 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 993 {
 994         struct nfs4_call_sync_data *data = calldata;
 995         nfs4_sequence_done(task, data->seq_res);
 996 }
 997
 998 static const struct rpc_call_ops nfs40_call_sync_ops = {
 999         .rpc_call_prepare = nfs40_call_sync_prepare,
1000         .rpc_call_done = nfs40_call_sync_done,
1001 };
1002
1003 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
1004                                    struct nfs_server *server,
1005                                    struct rpc_message *msg,
1006                                    struct nfs4_sequence_args *args,
1007                                    struct nfs4_sequence_res *res)
1008 {
1009         int ret;
1010         struct rpc_task *task;
1011         struct nfs_client *clp = server->nfs_client;
1012         struct nfs4_call_sync_data data = {
1013                 .seq_server = server,
1014                 .seq_args = args,
1015                 .seq_res = res,
1016         };
1017         struct rpc_task_setup task_setup = {
1018                 .rpc_client = clnt,
1019                 .rpc_message = msg,
1020                 .callback_ops = clp->cl_mvops->call_sync_ops,
1021                 .callback_data = &data
1022         };
1023
1024         task = rpc_run_task(&task_setup);
1025         if (IS_ERR(task))
1026                 ret = PTR_ERR(task);
1027         else {
1028                 ret = task->tk_status;
1029                 rpc_put_task(task);
1030         }
1031         return ret;
1032 }
1033
1034 int nfs4_call_sync(struct rpc_clnt *clnt,
1035                    struct nfs_server *server,
1036                    struct rpc_message *msg,
1037                    struct nfs4_sequence_args *args,
1038                    struct nfs4_sequence_res *res,
1039                    int cache_reply)
1040 {
1041         nfs4_init_sequence(args, res, cache_reply);
1042         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
1043 }
1044
1045 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
1046 {
1047         struct nfs_inode *nfsi = NFS_I(dir);
1048
1049         spin_lock(&dir->i_lock);
1050         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1051         if (!cinfo->atomic || cinfo->before != dir->i_version)
1052                 nfs_force_lookup_revalidate(dir);
1053         dir->i_version = cinfo->after;
1054         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1055         nfs_fscache_invalidate(dir);
1056         spin_unlock(&dir->i_lock);
1057 }
1058
1059 struct nfs4_opendata {
1060         struct kref kref;
1061         struct nfs_openargs o_arg;
1062         struct nfs_openres o_res;
1063         struct nfs_open_confirmargs c_arg;
1064         struct nfs_open_confirmres c_res;
1065         struct nfs4_string owner_name;
1066         struct nfs4_string group_name;
1067         struct nfs4_label *a_label;
1068         struct nfs_fattr f_attr;
1069         struct nfs4_label *f_label;
1070         struct dentry *dir;
1071         struct dentry *dentry;
1072         struct nfs4_state_owner *owner;
1073         struct nfs4_state *state;
1074         struct iattr attrs;
1075         unsigned long timestamp;
1076         unsigned int rpc_done : 1;
1077         unsigned int file_created : 1;
1078         unsigned int is_recover : 1;
1079         int rpc_status;
1080         int cancelled;
1081 };
1082
1083 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1084                 int err, struct nfs4_exception *exception)
1085 {
1086         if (err != -EINVAL)
1087                 return false;
1088         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1089                 return false;
1090         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1091         exception->retry = 1;
1092         return true;
1093 }
1094
1095 static u32
1096 nfs4_map_atomic_open_share(struct nfs_server *server,
1097                 fmode_t fmode, int openflags)
1098 {
1099         u32 res = 0;
1100
1101         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1102         case FMODE_READ:
1103                 res = NFS4_SHARE_ACCESS_READ;
1104                 break;
1105         case FMODE_WRITE:
1106                 res = NFS4_SHARE_ACCESS_WRITE;
1107                 break;
1108         case FMODE_READ|FMODE_WRITE:
1109                 res = NFS4_SHARE_ACCESS_BOTH;
1110         }
1111         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1112                 goto out;
1113         /* Want no delegation if we're using O_DIRECT */
1114         if (openflags & O_DIRECT)
1115                 res |= NFS4_SHARE_WANT_NO_DELEG;
1116 out:
1117         return res;
1118 }
1119
1120 static enum open_claim_type4
1121 nfs4_map_atomic_open_claim(struct nfs_server *server,
1122                 enum open_claim_type4 claim)
1123 {
1124         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1125                 return claim;
1126         switch (claim) {
1127         default:
1128                 return claim;
1129         case NFS4_OPEN_CLAIM_FH:
1130                 return NFS4_OPEN_CLAIM_NULL;
1131         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1132                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1133         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1134                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1135         }
1136 }
1137
1138 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1139 {
1140         p->o_res.f_attr = &p->f_attr;
1141         p->o_res.f_label = p->f_label;
1142         p->o_res.seqid = p->o_arg.seqid;
1143         p->c_res.seqid = p->c_arg.seqid;
1144         p->o_res.server = p->o_arg.server;
1145         p->o_res.access_request = p->o_arg.access;
1146         nfs_fattr_init(&p->f_attr);
1147         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1148 }
1149
1150 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1151                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1152                 const struct iattr *attrs,
1153                 struct nfs4_label *label,
1154                 enum open_claim_type4 claim,
1155                 gfp_t gfp_mask)
1156 {
1157         struct dentry *parent = dget_parent(dentry);
1158         struct inode *dir = d_inode(parent);
1159         struct nfs_server *server = NFS_SERVER(dir);
1160         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1161         struct nfs4_opendata *p;
1162
1163         p = kzalloc(sizeof(*p), gfp_mask);
1164         if (p == NULL)
1165                 goto err;
1166
1167         p->f_label = nfs4_label_alloc(server, gfp_mask);
1168         if (IS_ERR(p->f_label))
1169                 goto err_free_p;
1170
1171         p->a_label = nfs4_label_alloc(server, gfp_mask);
1172         if (IS_ERR(p->a_label))
1173                 goto err_free_f;
1174
1175         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1176         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1177         if (IS_ERR(p->o_arg.seqid))
1178                 goto err_free_label;
1179         nfs_sb_active(dentry->d_sb);
1180         p->dentry = dget(dentry);
1181         p->dir = parent;
1182         p->owner = sp;
1183         atomic_inc(&sp->so_count);
1184         p->o_arg.open_flags = flags;
1185         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1186         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1187                         fmode, flags);
1188         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1189          * will return permission denied for all bits until close */
1190         if (!(flags & O_EXCL)) {
1191                 /* ask server to check for all possible rights as results
1192                  * are cached */
1193                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1194                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1195         }
1196         p->o_arg.clientid = server->nfs_client->cl_clientid;
1197         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1198         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1199         p->o_arg.name = &dentry->d_name;
1200         p->o_arg.server = server;
1201         p->o_arg.bitmask = nfs4_bitmask(server, label);
1202         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1203         p->o_arg.label = nfs4_label_copy(p->a_label, label);
1204         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1205         switch (p->o_arg.claim) {
1206         case NFS4_OPEN_CLAIM_NULL:
1207         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1208         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1209                 p->o_arg.fh = NFS_FH(dir);
1210                 break;
1211         case NFS4_OPEN_CLAIM_PREVIOUS:
1212         case NFS4_OPEN_CLAIM_FH:
1213         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1214         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1215                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1216         }
1217         if (attrs != NULL && attrs->ia_valid != 0) {
1218                 __u32 verf[2];
1219
1220                 p->o_arg.u.attrs = &p->attrs;
1221                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1222
1223                 verf[0] = jiffies;
1224                 verf[1] = current->pid;
1225                 memcpy(p->o_arg.u.verifier.data, verf,
1226                                 sizeof(p->o_arg.u.verifier.data));
1227         }
1228         p->c_arg.fh = &p->o_res.fh;
1229         p->c_arg.stateid = &p->o_res.stateid;
1230         p->c_arg.seqid = p->o_arg.seqid;
1231         nfs4_init_opendata_res(p);
1232         kref_init(&p->kref);
1233         return p;
1234
1235 err_free_label:
1236         nfs4_label_free(p->a_label);
1237 err_free_f:
1238         nfs4_label_free(p->f_label);
1239 err_free_p:
1240         kfree(p);
1241 err:
1242         dput(parent);
1243         return NULL;
1244 }
1245
1246 static void nfs4_opendata_free(struct kref *kref)
1247 {
1248         struct nfs4_opendata *p = container_of(kref,
1249                         struct nfs4_opendata, kref);
1250         struct super_block *sb = p->dentry->d_sb;
1251
1252         nfs_free_seqid(p->o_arg.seqid);
1253         nfs4_sequence_free_slot(&p->o_res.seq_res);
1254         if (p->state != NULL)
1255                 nfs4_put_open_state(p->state);
1256         nfs4_put_state_owner(p->owner);
1257
1258         nfs4_label_free(p->a_label);
1259         nfs4_label_free(p->f_label);
1260
1261         dput(p->dir);
1262         dput(p->dentry);
1263         nfs_sb_deactive(sb);
1264         nfs_fattr_free_names(&p->f_attr);
1265         kfree(p->f_attr.mdsthreshold);
1266         kfree(p);
1267 }
1268
1269 static void nfs4_opendata_put(struct nfs4_opendata *p)
1270 {
1271         if (p != NULL)
1272                 kref_put(&p->kref, nfs4_opendata_free);
1273 }
1274
1275 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1276 {
1277         int ret;
1278
1279         ret = rpc_wait_for_completion_task(task);
1280         return ret;
1281 }
1282
1283 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1284                 fmode_t fmode)
1285 {
1286         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1287         case FMODE_READ|FMODE_WRITE:
1288                 return state->n_rdwr != 0;
1289         case FMODE_WRITE:
1290                 return state->n_wronly != 0;
1291         case FMODE_READ:
1292                 return state->n_rdonly != 0;
1293         }
1294         WARN_ON_ONCE(1);
1295         return false;
1296 }
1297
1298 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1299 {
1300         int ret = 0;
1301
1302         if (open_mode & (O_EXCL|O_TRUNC))
1303                 goto out;
1304         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1305                 case FMODE_READ:
1306                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1307                                 && state->n_rdonly != 0;
1308                         break;
1309                 case FMODE_WRITE:
1310                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1311                                 && state->n_wronly != 0;
1312                         break;
1313                 case FMODE_READ|FMODE_WRITE:
1314                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1315                                 && state->n_rdwr != 0;
1316         }
1317 out:
1318         return ret;
1319 }
1320
1321 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1322                 enum open_claim_type4 claim)
1323 {
1324         if (delegation == NULL)
1325                 return 0;
1326         if ((delegation->type & fmode) != fmode)
1327                 return 0;
1328         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1329                 return 0;
1330         switch (claim) {
1331         case NFS4_OPEN_CLAIM_NULL:
1332         case NFS4_OPEN_CLAIM_FH:
1333                 break;
1334         case NFS4_OPEN_CLAIM_PREVIOUS:
1335                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1336                         break;
1337         default:
1338                 return 0;
1339         }
1340         nfs_mark_delegation_referenced(delegation);
1341         return 1;
1342 }
1343
1344 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1345 {
1346         switch (fmode) {
1347                 case FMODE_WRITE:
1348                         state->n_wronly++;
1349                         break;
1350                 case FMODE_READ:
1351                         state->n_rdonly++;
1352                         break;
1353                 case FMODE_READ|FMODE_WRITE:
1354                         state->n_rdwr++;
1355         }
1356         nfs4_state_set_mode_locked(state, state->state | fmode);
1357 }
1358
1359 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1360 {
1361         struct nfs_client *clp = state->owner->so_server->nfs_client;
1362         bool need_recover = false;
1363
1364         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1365                 need_recover = true;
1366         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1367                 need_recover = true;
1368         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1369                 need_recover = true;
1370         if (need_recover)
1371                 nfs4_state_mark_reclaim_nograce(clp, state);
1372 }
1373
1374 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1375                 nfs4_stateid *stateid)
1376 {
1377         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1378                 return true;
1379         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1380                 nfs_test_and_clear_all_open_stateid(state);
1381                 return true;
1382         }
1383         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1384                 return true;
1385         return false;
1386 }
1387
1388 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1389 {
1390         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1391                 return;
1392         if (state->n_wronly)
1393                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1394         if (state->n_rdonly)
1395                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1396         if (state->n_rdwr)
1397                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1398         set_bit(NFS_OPEN_STATE, &state->flags);
1399 }
1400
1401 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1402                 nfs4_stateid *arg_stateid,
1403                 nfs4_stateid *stateid, fmode_t fmode)
1404 {
1405         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1406         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1407         case FMODE_WRITE:
1408                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1409                 break;
1410         case FMODE_READ:
1411                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1412                 break;
1413         case 0:
1414                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1415                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1416                 clear_bit(NFS_OPEN_STATE, &state->flags);
1417         }
1418         if (stateid == NULL)
1419                 return;
1420         /* Handle races with OPEN */
1421         if (!nfs4_stateid_match_other(arg_stateid, &state->open_stateid) ||
1422             (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1423             !nfs4_stateid_is_newer(stateid, &state->open_stateid))) {
1424                 nfs_resync_open_stateid_locked(state);
1425                 return;
1426         }
1427         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1428                 nfs4_stateid_copy(&state->stateid, stateid);
1429         nfs4_stateid_copy(&state->open_stateid, stateid);
1430 }
1431
1432 static void nfs_clear_open_stateid(struct nfs4_state *state,
1433         nfs4_stateid *arg_stateid,
1434         nfs4_stateid *stateid, fmode_t fmode)
1435 {
1436         write_seqlock(&state->seqlock);
1437         nfs_clear_open_stateid_locked(state, arg_stateid, stateid, fmode);
1438         write_sequnlock(&state->seqlock);
1439         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1440                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1441 }
1442
1443 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1444 {
1445         switch (fmode) {
1446                 case FMODE_READ:
1447                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1448                         break;
1449                 case FMODE_WRITE:
1450                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1451                         break;
1452                 case FMODE_READ|FMODE_WRITE:
1453                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1454         }
1455         if (!nfs_need_update_open_stateid(state, stateid))
1456                 return;
1457         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1458                 nfs4_stateid_copy(&state->stateid, stateid);
1459         nfs4_stateid_copy(&state->open_stateid, stateid);
1460 }
1461
1462 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1463 {
1464         /*
1465          * Protect the call to nfs4_state_set_mode_locked and
1466          * serialise the stateid update
1467          */
1468         spin_lock(&state->owner->so_lock);
1469         write_seqlock(&state->seqlock);
1470         if (deleg_stateid != NULL) {
1471                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1472                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1473         }
1474         if (open_stateid != NULL)
1475                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1476         write_sequnlock(&state->seqlock);
1477         update_open_stateflags(state, fmode);
1478         spin_unlock(&state->owner->so_lock);
1479 }
1480
1481 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1482 {
1483         struct nfs_inode *nfsi = NFS_I(state->inode);
1484         struct nfs_delegation *deleg_cur;
1485         int ret = 0;
1486
1487         fmode &= (FMODE_READ|FMODE_WRITE);
1488
1489         rcu_read_lock();
1490         deleg_cur = rcu_dereference(nfsi->delegation);
1491         if (deleg_cur == NULL)
1492                 goto no_delegation;
1493
1494         spin_lock(&deleg_cur->lock);
1495         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1496            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1497             (deleg_cur->type & fmode) != fmode)
1498                 goto no_delegation_unlock;
1499
1500         if (delegation == NULL)
1501                 delegation = &deleg_cur->stateid;
1502         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1503                 goto no_delegation_unlock;
1504
1505         nfs_mark_delegation_referenced(deleg_cur);
1506         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1507         ret = 1;
1508 no_delegation_unlock:
1509         spin_unlock(&deleg_cur->lock);
1510 no_delegation:
1511         rcu_read_unlock();
1512
1513         if (!ret && open_stateid != NULL) {
1514                 __update_open_stateid(state, open_stateid, NULL, fmode);
1515                 ret = 1;
1516         }
1517         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1518                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1519
1520         return ret;
1521 }
1522
1523 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1524                 const nfs4_stateid *stateid)
1525 {
1526         struct nfs4_state *state = lsp->ls_state;
1527         bool ret = false;
1528
1529         spin_lock(&state->state_lock);
1530         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1531                 goto out_noupdate;
1532         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1533                 goto out_noupdate;
1534         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1535         ret = true;
1536 out_noupdate:
1537         spin_unlock(&state->state_lock);
1538         return ret;
1539 }
1540
1541 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1542 {
1543         struct nfs_delegation *delegation;
1544
1545         rcu_read_lock();
1546         delegation = rcu_dereference(NFS_I(inode)->delegation);
1547         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1548                 rcu_read_unlock();
1549                 return;
1550         }
1551         rcu_read_unlock();
1552         nfs4_inode_return_delegation(inode);
1553 }
1554
1555 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1556 {
1557         struct nfs4_state *state = opendata->state;
1558         struct nfs_inode *nfsi = NFS_I(state->inode);
1559         struct nfs_delegation *delegation;
1560         int open_mode = opendata->o_arg.open_flags;
1561         fmode_t fmode = opendata->o_arg.fmode;
1562         enum open_claim_type4 claim = opendata->o_arg.claim;
1563         nfs4_stateid stateid;
1564         int ret = -EAGAIN;
1565
1566         for (;;) {
1567                 spin_lock(&state->owner->so_lock);
1568                 if (can_open_cached(state, fmode, open_mode)) {
1569                         update_open_stateflags(state, fmode);
1570                         spin_unlock(&state->owner->so_lock);
1571                         goto out_return_state;
1572                 }
1573                 spin_unlock(&state->owner->so_lock);
1574                 rcu_read_lock();
1575                 delegation = rcu_dereference(nfsi->delegation);
1576                 if (!can_open_delegated(delegation, fmode, claim)) {
1577                         rcu_read_unlock();
1578                         break;
1579                 }
1580                 /* Save the delegation */
1581                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1582                 rcu_read_unlock();
1583                 nfs_release_seqid(opendata->o_arg.seqid);
1584                 if (!opendata->is_recover) {
1585                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1586                         if (ret != 0)
1587                                 goto out;
1588                 }
1589                 ret = -EAGAIN;
1590
1591                 /* Try to update the stateid using the delegation */
1592                 if (update_open_stateid(state, NULL, &stateid, fmode))
1593                         goto out_return_state;
1594         }
1595 out:
1596         return ERR_PTR(ret);
1597 out_return_state:
1598         atomic_inc(&state->count);
1599         return state;
1600 }
1601
1602 static void
1603 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1604 {
1605         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1606         struct nfs_delegation *delegation;
1607         int delegation_flags = 0;
1608
1609         rcu_read_lock();
1610         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1611         if (delegation)
1612                 delegation_flags = delegation->flags;
1613         rcu_read_unlock();
1614         switch (data->o_arg.claim) {
1615         default:
1616                 break;
1617         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1618         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1619                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1620                                    "returning a delegation for "
1621                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1622                                    clp->cl_hostname);
1623                 return;
1624         }
1625         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1626                 nfs_inode_set_delegation(state->inode,
1627                                          data->owner->so_cred,
1628                                          &data->o_res);
1629         else
1630                 nfs_inode_reclaim_delegation(state->inode,
1631                                              data->owner->so_cred,
1632                                              &data->o_res);
1633 }
1634
1635 /*
1636  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1637  * and update the nfs4_state.
1638  */
1639 static struct nfs4_state *
1640 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1641 {
1642         struct inode *inode = data->state->inode;
1643         struct nfs4_state *state = data->state;
1644         int ret;
1645
1646         if (!data->rpc_done) {
1647                 if (data->rpc_status) {
1648                         ret = data->rpc_status;
1649                         goto err;
1650                 }
1651                 /* cached opens have already been processed */
1652                 goto update;
1653         }
1654
1655         ret = nfs_refresh_inode(inode, &data->f_attr);
1656         if (ret)
1657                 goto err;
1658
1659         if (data->o_res.delegation_type != 0)
1660                 nfs4_opendata_check_deleg(data, state);
1661 update:
1662         update_open_stateid(state, &data->o_res.stateid, NULL,
1663                             data->o_arg.fmode);
1664         atomic_inc(&state->count);
1665
1666         return state;
1667 err:
1668         return ERR_PTR(ret);
1669
1670 }
1671
1672 static struct nfs4_state *
1673 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1674 {
1675         struct inode *inode;
1676         struct nfs4_state *state = NULL;
1677         int ret;
1678
1679         if (!data->rpc_done) {
1680                 state = nfs4_try_open_cached(data);
1681                 trace_nfs4_cached_open(data->state);
1682                 goto out;
1683         }
1684
1685         ret = -EAGAIN;
1686         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1687                 goto err;
1688         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1689         ret = PTR_ERR(inode);
1690         if (IS_ERR(inode))
1691                 goto err;
1692         ret = -ENOMEM;
1693         state = nfs4_get_open_state(inode, data->owner);
1694         if (state == NULL)
1695                 goto err_put_inode;
1696         if (data->o_res.delegation_type != 0)
1697                 nfs4_opendata_check_deleg(data, state);
1698         update_open_stateid(state, &data->o_res.stateid, NULL,
1699                         data->o_arg.fmode);
1700         iput(inode);
1701 out:
1702         nfs_release_seqid(data->o_arg.seqid);
1703         return state;
1704 err_put_inode:
1705         iput(inode);
1706 err:
1707         return ERR_PTR(ret);
1708 }
1709
1710 static struct nfs4_state *
1711 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1712 {
1713         struct nfs4_state *ret;
1714
1715         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1716                 ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
1717         else
1718                 ret = _nfs4_opendata_to_nfs4_state(data);
1719         nfs4_sequence_free_slot(&data->o_res.seq_res);
1720         return ret;
1721 }
1722
1723 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1724 {
1725         struct nfs_inode *nfsi = NFS_I(state->inode);
1726         struct nfs_open_context *ctx;
1727
1728         spin_lock(&state->inode->i_lock);
1729         list_for_each_entry(ctx, &nfsi->open_files, list) {
1730                 if (ctx->state != state)
1731                         continue;
1732                 get_nfs_open_context(ctx);
1733                 spin_unlock(&state->inode->i_lock);
1734                 return ctx;
1735         }
1736         spin_unlock(&state->inode->i_lock);
1737         return ERR_PTR(-ENOENT);
1738 }
1739
1740 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1741                 struct nfs4_state *state, enum open_claim_type4 claim)
1742 {
1743         struct nfs4_opendata *opendata;
1744
1745         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1746                         NULL, NULL, claim, GFP_NOFS);
1747         if (opendata == NULL)
1748                 return ERR_PTR(-ENOMEM);
1749         opendata->state = state;
1750         atomic_inc(&state->count);
1751         return opendata;
1752 }
1753
1754 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
1755                 fmode_t fmode)
1756 {
1757         struct nfs4_state *newstate;
1758         int ret;
1759
1760         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
1761                 return 0;
1762         opendata->o_arg.open_flags = 0;
1763         opendata->o_arg.fmode = fmode;
1764         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1765                         NFS_SB(opendata->dentry->d_sb),
1766                         fmode, 0);
1767         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1768         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1769         nfs4_init_opendata_res(opendata);
1770         ret = _nfs4_recover_proc_open(opendata);
1771         if (ret != 0)
1772                 return ret;
1773         newstate = nfs4_opendata_to_nfs4_state(opendata);
1774         if (IS_ERR(newstate))
1775                 return PTR_ERR(newstate);
1776         if (newstate != opendata->state)
1777                 ret = -ESTALE;
1778         nfs4_close_state(newstate, fmode);
1779         return ret;
1780 }
1781
1782 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1783 {
1784         int ret;
1785
1786         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1787         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1788         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1789         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1790         /* memory barrier prior to reading state->n_* */
1791         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1792         clear_bit(NFS_OPEN_STATE, &state->flags);
1793         smp_rmb();
1794         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1795         if (ret != 0)
1796                 return ret;
1797         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1798         if (ret != 0)
1799                 return ret;
1800         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
1801         if (ret != 0)
1802                 return ret;
1803         /*
1804          * We may have performed cached opens for all three recoveries.
1805          * Check if we need to update the current stateid.
1806          */
1807         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1808             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1809                 write_seqlock(&state->seqlock);
1810                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1811                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1812                 write_sequnlock(&state->seqlock);
1813         }
1814         return 0;
1815 }
1816
1817 /*
1818  * OPEN_RECLAIM:
1819  *      reclaim state on the server after a reboot.
1820  */
1821 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1822 {
1823         struct nfs_delegation *delegation;
1824         struct nfs4_opendata *opendata;
1825         fmode_t delegation_type = 0;
1826         int status;
1827
1828         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1829                         NFS4_OPEN_CLAIM_PREVIOUS);
1830         if (IS_ERR(opendata))
1831                 return PTR_ERR(opendata);
1832         rcu_read_lock();
1833         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1834         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1835                 delegation_type = delegation->type;
1836         rcu_read_unlock();
1837         opendata->o_arg.u.delegation_type = delegation_type;
1838         status = nfs4_open_recover(opendata, state);
1839         nfs4_opendata_put(opendata);
1840         return status;
1841 }
1842
1843 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1844 {
1845         struct nfs_server *server = NFS_SERVER(state->inode);
1846         struct nfs4_exception exception = { };
1847         int err;
1848         do {
1849                 err = _nfs4_do_open_reclaim(ctx, state);
1850                 trace_nfs4_open_reclaim(ctx, 0, err);
1851                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1852                         continue;
1853                 if (err != -NFS4ERR_DELAY)
1854                         break;
1855                 nfs4_handle_exception(server, err, &exception);
1856         } while (exception.retry);
1857         return err;
1858 }
1859
1860 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1861 {
1862         struct nfs_open_context *ctx;
1863         int ret;
1864
1865         ctx = nfs4_state_find_open_context(state);
1866         if (IS_ERR(ctx))
1867                 return -EAGAIN;
1868         ret = nfs4_do_open_reclaim(ctx, state);
1869         put_nfs_open_context(ctx);
1870         return ret;
1871 }
1872
1873 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1874 {
1875         switch (err) {
1876                 default:
1877                         printk(KERN_ERR "NFS: %s: unhandled error "
1878                                         "%d.\n", __func__, err);
1879                 case 0:
1880                 case -ENOENT:
1881                 case -EAGAIN:
1882                 case -ESTALE:
1883                         break;
1884                 case -NFS4ERR_BADSESSION:
1885                 case -NFS4ERR_BADSLOT:
1886                 case -NFS4ERR_BAD_HIGH_SLOT:
1887                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1888                 case -NFS4ERR_DEADSESSION:
1889                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1890                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1891                         return -EAGAIN;
1892                 case -NFS4ERR_STALE_CLIENTID:
1893                 case -NFS4ERR_STALE_STATEID:
1894                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1895                 case -NFS4ERR_EXPIRED:
1896                         /* Don't recall a delegation if it was lost */
1897                         nfs4_schedule_lease_recovery(server->nfs_client);
1898                         return -EAGAIN;
1899                 case -NFS4ERR_MOVED:
1900                         nfs4_schedule_migration_recovery(server);
1901                         return -EAGAIN;
1902                 case -NFS4ERR_LEASE_MOVED:
1903                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1904                         return -EAGAIN;
1905                 case -NFS4ERR_DELEG_REVOKED:
1906                 case -NFS4ERR_ADMIN_REVOKED:
1907                 case -NFS4ERR_BAD_STATEID:
1908                 case -NFS4ERR_OPENMODE:
1909                         nfs_inode_find_state_and_recover(state->inode,
1910                                         stateid);
1911                         nfs4_schedule_stateid_recovery(server, state);
1912                         return -EAGAIN;
1913                 case -NFS4ERR_DELAY:
1914                 case -NFS4ERR_GRACE:
1915                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1916                         ssleep(1);
1917                         return -EAGAIN;
1918                 case -ENOMEM:
1919                 case -NFS4ERR_DENIED:
1920                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1921                         return 0;
1922         }
1923         return err;
1924 }
1925
1926 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
1927                 struct nfs4_state *state, const nfs4_stateid *stateid,
1928                 fmode_t type)
1929 {
1930         struct nfs_server *server = NFS_SERVER(state->inode);
1931         struct nfs4_opendata *opendata;
1932         int err = 0;
1933
1934         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1935                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1936         if (IS_ERR(opendata))
1937                 return PTR_ERR(opendata);
1938         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1939         write_seqlock(&state->seqlock);
1940         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1941         write_sequnlock(&state->seqlock);
1942         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1943         switch (type & (FMODE_READ|FMODE_WRITE)) {
1944         case FMODE_READ|FMODE_WRITE:
1945         case FMODE_WRITE:
1946                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1947                 if (err)
1948                         break;
1949                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1950                 if (err)
1951                         break;
1952         case FMODE_READ:
1953                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
1954         }
1955         nfs4_opendata_put(opendata);
1956         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1957 }
1958
1959 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1960 {
1961         struct nfs4_opendata *data = calldata;
1962
1963         nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
1964                              &data->c_arg.seq_args, &data->c_res.seq_res, task);
1965 }
1966
1967 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1968 {
1969         struct nfs4_opendata *data = calldata;
1970
1971         nfs40_sequence_done(task, &data->c_res.seq_res);
1972
1973         data->rpc_status = task->tk_status;
1974         if (data->rpc_status == 0) {
1975                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1976                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1977                 renew_lease(data->o_res.server, data->timestamp);
1978                 data->rpc_done = 1;
1979         }
1980 }
1981
1982 static void nfs4_open_confirm_release(void *calldata)
1983 {
1984         struct nfs4_opendata *data = calldata;
1985         struct nfs4_state *state = NULL;
1986
1987         /* If this request hasn't been cancelled, do nothing */
1988         if (data->cancelled == 0)
1989                 goto out_free;
1990         /* In case of error, no cleanup! */
1991         if (!data->rpc_done)
1992                 goto out_free;
1993         state = nfs4_opendata_to_nfs4_state(data);
1994         if (!IS_ERR(state))
1995                 nfs4_close_state(state, data->o_arg.fmode);
1996 out_free:
1997         nfs4_opendata_put(data);
1998 }
1999
2000 static const struct rpc_call_ops nfs4_open_confirm_ops = {
2001         .rpc_call_prepare = nfs4_open_confirm_prepare,
2002         .rpc_call_done = nfs4_open_confirm_done,
2003         .rpc_release = nfs4_open_confirm_release,
2004 };
2005
2006 /*
2007  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
2008  */
2009 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
2010 {
2011         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
2012         struct rpc_task *task;
2013         struct  rpc_message msg = {
2014                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
2015                 .rpc_argp = &data->c_arg,
2016                 .rpc_resp = &data->c_res,
2017                 .rpc_cred = data->owner->so_cred,
2018         };
2019         struct rpc_task_setup task_setup_data = {
2020                 .rpc_client = server->client,
2021                 .rpc_message = &msg,
2022                 .callback_ops = &nfs4_open_confirm_ops,
2023                 .callback_data = data,
2024                 .workqueue = nfsiod_workqueue,
2025                 .flags = RPC_TASK_ASYNC,
2026         };
2027         int status;
2028
2029         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
2030         kref_get(&data->kref);
2031         data->rpc_done = 0;
2032         data->rpc_status = 0;
2033         data->timestamp = jiffies;
2034         if (data->is_recover)
2035                 nfs4_set_sequence_privileged(&data->c_arg.seq_args);
2036         task = rpc_run_task(&task_setup_data);
2037         if (IS_ERR(task))
2038                 return PTR_ERR(task);
2039         status = nfs4_wait_for_completion_rpc_task(task);
2040         if (status != 0) {
2041                 data->cancelled = 1;
2042                 smp_wmb();
2043         } else
2044                 status = data->rpc_status;
2045         rpc_put_task(task);
2046         return status;
2047 }
2048
2049 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
2050 {
2051         struct nfs4_opendata *data = calldata;
2052         struct nfs4_state_owner *sp = data->owner;
2053         struct nfs_client *clp = sp->so_server->nfs_client;
2054         enum open_claim_type4 claim = data->o_arg.claim;
2055
2056         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
2057                 goto out_wait;
2058         /*
2059          * Check if we still need to send an OPEN call, or if we can use
2060          * a delegation instead.
2061          */
2062         if (data->state != NULL) {
2063                 struct nfs_delegation *delegation;
2064
2065                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
2066                         goto out_no_action;
2067                 rcu_read_lock();
2068                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
2069                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2070                         goto unlock_no_action;
2071                 rcu_read_unlock();
2072         }
2073         /* Update client id. */
2074         data->o_arg.clientid = clp->cl_clientid;
2075         switch (claim) {
2076         default:
2077                 break;
2078         case NFS4_OPEN_CLAIM_PREVIOUS:
2079         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2080         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2081                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2082         case NFS4_OPEN_CLAIM_FH:
2083                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2084                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
2085         }
2086         data->timestamp = jiffies;
2087         if (nfs4_setup_sequence(data->o_arg.server,
2088                                 &data->o_arg.seq_args,
2089                                 &data->o_res.seq_res,
2090                                 task) != 0)
2091                 nfs_release_seqid(data->o_arg.seqid);
2092
2093         /* Set the create mode (note dependency on the session type) */
2094         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2095         if (data->o_arg.open_flags & O_EXCL) {
2096                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2097                 if (nfs4_has_persistent_session(clp))
2098                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2099                 else if (clp->cl_mvops->minor_version > 0)
2100                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2101         }
2102         return;
2103 unlock_no_action:
2104         trace_nfs4_cached_open(data->state);
2105         rcu_read_unlock();
2106 out_no_action:
2107         task->tk_action = NULL;
2108 out_wait:
2109         nfs4_sequence_done(task, &data->o_res.seq_res);
2110 }
2111
2112 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2113 {
2114         struct nfs4_opendata *data = calldata;
2115
2116         data->rpc_status = task->tk_status;
2117
2118         if (!nfs4_sequence_process(task, &data->o_res.seq_res))
2119                 return;
2120
2121         if (task->tk_status == 0) {
2122                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2123                         switch (data->o_res.f_attr->mode & S_IFMT) {
2124                         case S_IFREG:
2125                                 break;
2126                         case S_IFLNK:
2127                                 data->rpc_status = -ELOOP;
2128                                 break;
2129                         case S_IFDIR:
2130                                 data->rpc_status = -EISDIR;
2131                                 break;
2132                         default:
2133                                 data->rpc_status = -ENOTDIR;
2134                         }
2135                 }
2136                 renew_lease(data->o_res.server, data->timestamp);
2137                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2138                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2139         }
2140         data->rpc_done = 1;
2141 }
2142
2143 static void nfs4_open_release(void *calldata)
2144 {
2145         struct nfs4_opendata *data = calldata;
2146         struct nfs4_state *state = NULL;
2147
2148         /* If this request hasn't been cancelled, do nothing */
2149         if (data->cancelled == 0)
2150                 goto out_free;
2151         /* In case of error, no cleanup! */
2152         if (data->rpc_status != 0 || !data->rpc_done)
2153                 goto out_free;
2154         /* In case we need an open_confirm, no cleanup! */
2155         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2156                 goto out_free;
2157         state = nfs4_opendata_to_nfs4_state(data);
2158         if (!IS_ERR(state))
2159                 nfs4_close_state(state, data->o_arg.fmode);
2160 out_free:
2161         nfs4_opendata_put(data);
2162 }
2163
2164 static const struct rpc_call_ops nfs4_open_ops = {
2165         .rpc_call_prepare = nfs4_open_prepare,
2166         .rpc_call_done = nfs4_open_done,
2167         .rpc_release = nfs4_open_release,
2168 };
2169
2170 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
2171 {
2172         struct inode *dir = d_inode(data->dir);
2173         struct nfs_server *server = NFS_SERVER(dir);
2174         struct nfs_openargs *o_arg = &data->o_arg;
2175         struct nfs_openres *o_res = &data->o_res;
2176         struct rpc_task *task;
2177         struct rpc_message msg = {
2178                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2179                 .rpc_argp = o_arg,
2180                 .rpc_resp = o_res,
2181                 .rpc_cred = data->owner->so_cred,
2182         };
2183         struct rpc_task_setup task_setup_data = {
2184                 .rpc_client = server->client,
2185                 .rpc_message = &msg,
2186                 .callback_ops = &nfs4_open_ops,
2187                 .callback_data = data,
2188                 .workqueue = nfsiod_workqueue,
2189                 .flags = RPC_TASK_ASYNC,
2190         };
2191         int status;
2192
2193         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
2194         kref_get(&data->kref);
2195         data->rpc_done = 0;
2196         data->rpc_status = 0;
2197         data->cancelled = 0;
2198         data->is_recover = 0;
2199         if (isrecover) {
2200                 nfs4_set_sequence_privileged(&o_arg->seq_args);
2201                 data->is_recover = 1;
2202         }
2203         task = rpc_run_task(&task_setup_data);
2204         if (IS_ERR(task))
2205                 return PTR_ERR(task);
2206         status = nfs4_wait_for_completion_rpc_task(task);
2207         if (status != 0) {
2208                 data->cancelled = 1;
2209                 smp_wmb();
2210         } else
2211                 status = data->rpc_status;
2212         rpc_put_task(task);
2213
2214         return status;
2215 }
2216
2217 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2218 {
2219         struct inode *dir = d_inode(data->dir);
2220         struct nfs_openres *o_res = &data->o_res;
2221         int status;
2222
2223         status = nfs4_run_open_task(data, 1);
2224         if (status != 0 || !data->rpc_done)
2225                 return status;
2226
2227         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2228
2229         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2230                 status = _nfs4_proc_open_confirm(data);
2231                 if (status != 0)
2232                         return status;
2233         }
2234
2235         return status;
2236 }
2237
2238 /*
2239  * Additional permission checks in order to distinguish between an
2240  * open for read, and an open for execute. This works around the
2241  * fact that NFSv4 OPEN treats read and execute permissions as being
2242  * the same.
2243  * Note that in the non-execute case, we want to turn off permission
2244  * checking if we just created a new file (POSIX open() semantics).
2245  */
2246 static int nfs4_opendata_access(struct rpc_cred *cred,
2247                                 struct nfs4_opendata *opendata,
2248                                 struct nfs4_state *state, fmode_t fmode,
2249                                 int openflags)
2250 {
2251         struct nfs_access_entry cache;
2252         u32 mask;
2253
2254         /* access call failed or for some reason the server doesn't
2255          * support any access modes -- defer access call until later */
2256         if (opendata->o_res.access_supported == 0)
2257                 return 0;
2258
2259         mask = 0;
2260         /*
2261          * Use openflags to check for exec, because fmode won't
2262          * always have FMODE_EXEC set when file open for exec.
2263          */
2264         if (openflags & __FMODE_EXEC) {
2265                 /* ONLY check for exec rights */
2266                 mask = MAY_EXEC;
2267         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2268                 mask = MAY_READ;
2269
2270         cache.cred = cred;
2271         cache.jiffies = jiffies;
2272         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2273         nfs_access_add_cache(state->inode, &cache);
2274
2275         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2276                 return 0;
2277
2278         /* even though OPEN succeeded, access is denied. Close the file */
2279         nfs4_close_state(state, fmode);
2280         return -EACCES;
2281 }
2282
2283 /*
2284  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2285  */
2286 static int _nfs4_proc_open(struct nfs4_opendata *data)
2287 {
2288         struct inode *dir = d_inode(data->dir);
2289         struct nfs_server *server = NFS_SERVER(dir);
2290         struct nfs_openargs *o_arg = &data->o_arg;
2291         struct nfs_openres *o_res = &data->o_res;
2292         int status;
2293
2294         status = nfs4_run_open_task(data, 0);
2295         if (!data->rpc_done)
2296                 return status;
2297         if (status != 0) {
2298                 if (status == -NFS4ERR_BADNAME &&
2299                                 !(o_arg->open_flags & O_CREAT))
2300                         return -ENOENT;
2301                 return status;
2302         }
2303
2304         nfs_fattr_map_and_free_names(server, &data->f_attr);
2305
2306         if (o_arg->open_flags & O_CREAT) {
2307                 update_changeattr(dir, &o_res->cinfo);
2308                 if (o_arg->open_flags & O_EXCL)
2309                         data->file_created = 1;
2310                 else if (o_res->cinfo.before != o_res->cinfo.after)
2311                         data->file_created = 1;
2312         }
2313         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2314                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2315         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2316                 status = _nfs4_proc_open_confirm(data);
2317                 if (status != 0)
2318                         return status;
2319         }
2320         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2321                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2322         return 0;
2323 }
2324
2325 static int nfs4_recover_expired_lease(struct nfs_server *server)
2326 {
2327         return nfs4_client_recover_expired_lease(server->nfs_client);
2328 }
2329
2330 /*
2331  * OPEN_EXPIRED:
2332  *      reclaim state on the server after a network partition.
2333  *      Assumes caller holds the appropriate lock
2334  */
2335 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2336 {
2337         struct nfs4_opendata *opendata;
2338         int ret;
2339
2340         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2341                         NFS4_OPEN_CLAIM_FH);
2342         if (IS_ERR(opendata))
2343                 return PTR_ERR(opendata);
2344         ret = nfs4_open_recover(opendata, state);
2345         if (ret == -ESTALE)
2346                 d_drop(ctx->dentry);
2347         nfs4_opendata_put(opendata);
2348         return ret;
2349 }
2350
2351 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2352 {
2353         struct nfs_server *server = NFS_SERVER(state->inode);
2354         struct nfs4_exception exception = { };
2355         int err;
2356
2357         do {
2358                 err = _nfs4_open_expired(ctx, state);
2359                 trace_nfs4_open_expired(ctx, 0, err);
2360                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2361                         continue;
2362                 switch (err) {
2363                 default:
2364                         goto out;
2365                 case -NFS4ERR_GRACE:
2366                 case -NFS4ERR_DELAY:
2367                         nfs4_handle_exception(server, err, &exception);
2368                         err = 0;
2369                 }
2370         } while (exception.retry);
2371 out:
2372         return err;
2373 }
2374
2375 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2376 {
2377         struct nfs_open_context *ctx;
2378         int ret;
2379
2380         ctx = nfs4_state_find_open_context(state);
2381         if (IS_ERR(ctx))
2382                 return -EAGAIN;
2383         ret = nfs4_do_open_expired(ctx, state);
2384         put_nfs_open_context(ctx);
2385         return ret;
2386 }
2387
2388 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
2389                 const nfs4_stateid *stateid)
2390 {
2391         nfs_remove_bad_delegation(state->inode, stateid);
2392         write_seqlock(&state->seqlock);
2393         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2394         write_sequnlock(&state->seqlock);
2395         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2396 }
2397
2398 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2399 {
2400         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2401                 nfs_finish_clear_delegation_stateid(state, NULL);
2402 }
2403
2404 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2405 {
2406         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2407         nfs40_clear_delegation_stateid(state);
2408         return nfs4_open_expired(sp, state);
2409 }
2410
2411 static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
2412                 nfs4_stateid *stateid,
2413                 struct rpc_cred *cred)
2414 {
2415         return -NFS4ERR_BAD_STATEID;
2416 }
2417
2418 #if defined(CONFIG_NFS_V4_1)
2419 static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
2420                 nfs4_stateid *stateid,
2421                 struct rpc_cred *cred)
2422 {
2423         int status;
2424
2425         switch (stateid->type) {
2426         default:
2427                 break;
2428         case NFS4_INVALID_STATEID_TYPE:
2429         case NFS4_SPECIAL_STATEID_TYPE:
2430                 return -NFS4ERR_BAD_STATEID;
2431         case NFS4_REVOKED_STATEID_TYPE:
2432                 goto out_free;
2433         }
2434
2435         status = nfs41_test_stateid(server, stateid, cred);
2436         switch (status) {
2437         case -NFS4ERR_EXPIRED:
2438         case -NFS4ERR_ADMIN_REVOKED:
2439         case -NFS4ERR_DELEG_REVOKED:
2440                 break;
2441         default:
2442                 return status;
2443         }
2444 out_free:
2445         /* Ack the revoked state to the server */
2446         nfs41_free_stateid(server, stateid, cred);
2447         return -NFS4ERR_EXPIRED;
2448 }
2449
2450 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2451 {
2452         struct nfs_server *server = NFS_SERVER(state->inode);
2453         nfs4_stateid stateid;
2454         struct nfs_delegation *delegation;
2455         struct rpc_cred *cred;
2456         int status;
2457
2458         /* Get the delegation credential for use by test/free_stateid */
2459         rcu_read_lock();
2460         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2461         if (delegation == NULL) {
2462                 rcu_read_unlock();
2463                 return;
2464         }
2465
2466         nfs4_stateid_copy(&stateid, &delegation->stateid);
2467         if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags)) {
2468                 rcu_read_unlock();
2469                 nfs_finish_clear_delegation_stateid(state, &stateid);
2470                 return;
2471         }
2472
2473         if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags)) {
2474                 rcu_read_unlock();
2475                 return;
2476         }
2477
2478         cred = get_rpccred(delegation->cred);
2479         rcu_read_unlock();
2480         status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
2481         trace_nfs4_test_delegation_stateid(state, NULL, status);
2482         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
2483                 nfs_finish_clear_delegation_stateid(state, &stateid);
2484
2485         put_rpccred(cred);
2486 }
2487
2488 /**
2489  * nfs41_check_expired_locks - possibly free a lock stateid
2490  *
2491  * @state: NFSv4 state for an inode
2492  *
2493  * Returns NFS_OK if recovery for this stateid is now finished.
2494  * Otherwise a negative NFS4ERR value is returned.
2495  */
2496 static int nfs41_check_expired_locks(struct nfs4_state *state)
2497 {
2498         int status, ret = NFS_OK;
2499         struct nfs4_lock_state *lsp;
2500         struct nfs_server *server = NFS_SERVER(state->inode);
2501
2502         if (!test_bit(LK_STATE_IN_USE, &state->flags))
2503                 goto out;
2504         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
2505                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
2506                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
2507
2508                         status = nfs41_test_and_free_expired_stateid(server,
2509                                         &lsp->ls_stateid,
2510                                         cred);
2511                         trace_nfs4_test_lock_stateid(state, lsp, status);
2512                         if (status == -NFS4ERR_EXPIRED ||
2513                             status == -NFS4ERR_BAD_STATEID) {
2514                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
2515                                 if (!recover_lost_locks)
2516                                         set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
2517                         } else if (status != NFS_OK) {
2518                                 ret = status;
2519                                 break;
2520                         }
2521                 }
2522         };
2523 out:
2524         return ret;
2525 }
2526
2527 /**
2528  * nfs41_check_open_stateid - possibly free an open stateid
2529  *
2530  * @state: NFSv4 state for an inode
2531  *
2532  * Returns NFS_OK if recovery for this stateid is now finished.
2533  * Otherwise a negative NFS4ERR value is returned.
2534  */
2535 static int nfs41_check_open_stateid(struct nfs4_state *state)
2536 {
2537         struct nfs_server *server = NFS_SERVER(state->inode);
2538         nfs4_stateid *stateid = &state->open_stateid;
2539         struct rpc_cred *cred = state->owner->so_cred;
2540         int status;
2541
2542         /* If a state reset has been done, test_stateid is unneeded */
2543         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2544             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2545             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2546                 return -NFS4ERR_BAD_STATEID;
2547
2548         status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
2549         trace_nfs4_test_open_stateid(state, NULL, status);
2550         if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
2551                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2552                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2553                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2554                 clear_bit(NFS_OPEN_STATE, &state->flags);
2555         }
2556         return status;
2557 }
2558
2559 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2560 {
2561         int status;
2562
2563         nfs41_check_delegation_stateid(state);
2564         status = nfs41_check_expired_locks(state);
2565         if (status != NFS_OK)
2566                 return status;
2567         status = nfs41_check_open_stateid(state);
2568         if (status != NFS_OK)
2569                 status = nfs4_open_expired(sp, state);
2570         return status;
2571 }
2572 #endif
2573
2574 /*
2575  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2576  * fields corresponding to attributes that were used to store the verifier.
2577  * Make sure we clobber those fields in the later setattr call
2578  */
2579 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2580                                 struct iattr *sattr, struct nfs4_label **label)
2581 {
2582         const u32 *attrset = opendata->o_res.attrset;
2583
2584         if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2585             !(sattr->ia_valid & ATTR_ATIME_SET))
2586                 sattr->ia_valid |= ATTR_ATIME;
2587
2588         if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2589             !(sattr->ia_valid & ATTR_MTIME_SET))
2590                 sattr->ia_valid |= ATTR_MTIME;
2591
2592         /* Except MODE, it seems harmless of setting twice. */
2593         if ((attrset[1] & FATTR4_WORD1_MODE))
2594                 sattr->ia_valid &= ~ATTR_MODE;
2595
2596         if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL)
2597                 *label = NULL;
2598 }
2599
2600 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2601                 fmode_t fmode,
2602                 int flags,
2603                 struct nfs_open_context *ctx)
2604 {
2605         struct nfs4_state_owner *sp = opendata->owner;
2606         struct nfs_server *server = sp->so_server;
2607         struct dentry *dentry;
2608         struct nfs4_state *state;
2609         unsigned int seq;
2610         int ret;
2611
2612         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2613
2614         ret = _nfs4_proc_open(opendata);
2615         if (ret != 0)
2616                 goto out;
2617
2618         state = nfs4_opendata_to_nfs4_state(opendata);
2619         ret = PTR_ERR(state);
2620         if (IS_ERR(state))
2621                 goto out;
2622         if (server->caps & NFS_CAP_POSIX_LOCK)
2623                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2624         if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
2625                 set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
2626
2627         dentry = opendata->dentry;
2628         if (d_really_is_negative(dentry)) {
2629                 struct dentry *alias;
2630                 d_drop(dentry);
2631                 alias = d_exact_alias(dentry, state->inode);
2632                 if (!alias)
2633                         alias = d_splice_alias(igrab(state->inode), dentry);
2634                 /* d_splice_alias() can't fail here - it's a non-directory */
2635                 if (alias) {
2636                         dput(ctx->dentry);
2637                         ctx->dentry = dentry = alias;
2638                 }
2639                 nfs_set_verifier(dentry,
2640                                 nfs_save_change_attribute(d_inode(opendata->dir)));
2641         }
2642
2643         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2644         if (ret != 0)
2645                 goto out;
2646
2647         ctx->state = state;
2648         if (d_inode(dentry) == state->inode) {
2649                 nfs_inode_attach_open_context(ctx);
2650                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2651                         nfs4_schedule_stateid_recovery(server, state);
2652         }
2653 out:
2654         return ret;
2655 }
2656
2657 /*
2658  * Returns a referenced nfs4_state
2659  */
2660 static int _nfs4_do_open(struct inode *dir,
2661                         struct nfs_open_context *ctx,
2662                         int flags,
2663                         struct iattr *sattr,
2664                         struct nfs4_label *label,
2665                         int *opened)
2666 {
2667         struct nfs4_state_owner  *sp;
2668         struct nfs4_state     *state = NULL;
2669         struct nfs_server       *server = NFS_SERVER(dir);
2670         struct nfs4_opendata *opendata;
2671         struct dentry *dentry = ctx->dentry;
2672         struct rpc_cred *cred = ctx->cred;
2673         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2674         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2675         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2676         struct nfs4_label *olabel = NULL;
2677         int status;
2678
2679         /* Protect against reboot recovery conflicts */
2680         status = -ENOMEM;
2681         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2682         if (sp == NULL) {
2683                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2684                 goto out_err;
2685         }
2686         status = nfs4_recover_expired_lease(server);
2687         if (status != 0)
2688                 goto err_put_state_owner;
2689         if (d_really_is_positive(dentry))
2690                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2691         status = -ENOMEM;
2692         if (d_really_is_positive(dentry))
2693                 claim = NFS4_OPEN_CLAIM_FH;
2694         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2695                         label, claim, GFP_KERNEL);
2696         if (opendata == NULL)
2697                 goto err_put_state_owner;
2698
2699         if (label) {
2700                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2701                 if (IS_ERR(olabel)) {
2702                         status = PTR_ERR(olabel);
2703                         goto err_opendata_put;
2704                 }
2705         }
2706
2707         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2708                 if (!opendata->f_attr.mdsthreshold) {
2709                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2710                         if (!opendata->f_attr.mdsthreshold)
2711                                 goto err_free_label;
2712                 }
2713                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2714         }
2715         if (d_really_is_positive(dentry))
2716                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2717
2718         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2719         if (status != 0)
2720                 goto err_free_label;
2721         state = ctx->state;
2722
2723         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
2724             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2725                 nfs4_exclusive_attrset(opendata, sattr, &label);
2726                 /*
2727                  * send create attributes which was not set by open
2728                  * with an extra setattr.
2729                  */
2730                 if (sattr->ia_valid & NFS4_VALID_ATTRS) {
2731                         nfs_fattr_init(opendata->o_res.f_attr);
2732                         status = nfs4_do_setattr(state->inode, cred,
2733                                         opendata->o_res.f_attr, sattr,
2734                                         state, label, olabel);
2735                         if (status == 0) {
2736                                 nfs_setattr_update_inode(state->inode, sattr,
2737                                                 opendata->o_res.f_attr);
2738                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2739                         }
2740                 }
2741         }
2742         if (opened && opendata->file_created)
2743                 *opened |= FILE_CREATED;
2744
2745         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2746                 *ctx_th = opendata->f_attr.mdsthreshold;
2747                 opendata->f_attr.mdsthreshold = NULL;
2748         }
2749
2750         nfs4_label_free(olabel);
2751
2752         nfs4_opendata_put(opendata);
2753         nfs4_put_state_owner(sp);
2754         return 0;
2755 err_free_label:
2756         nfs4_label_free(olabel);
2757 err_opendata_put:
2758         nfs4_opendata_put(opendata);
2759 err_put_state_owner:
2760         nfs4_put_state_owner(sp);
2761 out_err:
2762         return status;
2763 }
2764
2765
2766 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2767                                         struct nfs_open_context *ctx,
2768                                         int flags,
2769                                         struct iattr *sattr,
2770                                         struct nfs4_label *label,
2771                                         int *opened)
2772 {
2773         struct nfs_server *server = NFS_SERVER(dir);
2774         struct nfs4_exception exception = { };
2775         struct nfs4_state *res;
2776         int status;
2777
2778         do {
2779                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2780                 res = ctx->state;
2781                 trace_nfs4_open_file(ctx, flags, status);
2782                 if (status == 0)
2783                         break;
2784                 /* NOTE: BAD_SEQID means the server and client disagree about the
2785                  * book-keeping w.r.t. state-changing operations
2786                  * (OPEN/CLOSE/LOCK/LOCKU...)
2787                  * It is actually a sign of a bug on the client or on the server.
2788                  *
2789                  * If we receive a BAD_SEQID error in the particular case of
2790                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2791                  * have unhashed the old state_owner for us, and that we can
2792                  * therefore safely retry using a new one. We should still warn
2793                  * the user though...
2794                  */
2795                 if (status == -NFS4ERR_BAD_SEQID) {
2796                         pr_warn_ratelimited("NFS: v4 server %s "
2797                                         " returned a bad sequence-id error!\n",
2798                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2799                         exception.retry = 1;
2800                         continue;
2801                 }
2802                 /*
2803                  * BAD_STATEID on OPEN means that the server cancelled our
2804                  * state before it received the OPEN_CONFIRM.
2805                  * Recover by retrying the request as per the discussion
2806                  * on Page 181 of RFC3530.
2807                  */
2808                 if (status == -NFS4ERR_BAD_STATEID) {
2809                         exception.retry = 1;
2810                         continue;
2811                 }
2812                 if (status == -EAGAIN) {
2813                         /* We must have found a delegation */
2814                         exception.retry = 1;
2815                         continue;
2816                 }
2817                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2818                         continue;
2819                 res = ERR_PTR(nfs4_handle_exception(server,
2820                                         status, &exception));
2821         } while (exception.retry);
2822         return res;
2823 }
2824
2825 static int _nfs4_do_setattr(struct inode *inode,
2826                             struct nfs_setattrargs *arg,
2827                             struct nfs_setattrres *res,
2828                             struct rpc_cred *cred,
2829                             struct nfs4_state *state)
2830 {
2831         struct nfs_server *server = NFS_SERVER(inode);
2832         struct rpc_message msg = {
2833                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2834                 .rpc_argp       = arg,
2835                 .rpc_resp       = res,
2836                 .rpc_cred       = cred,
2837         };
2838         struct rpc_cred *delegation_cred = NULL;
2839         unsigned long timestamp = jiffies;
2840         fmode_t fmode;
2841         bool truncate;
2842         int status;
2843
2844         nfs_fattr_init(res->fattr);
2845
2846         /* Servers should only apply open mode checks for file size changes */
2847         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
2848         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2849
2850         if (nfs4_copy_delegation_stateid(inode, fmode, &arg->stateid, &delegation_cred)) {
2851                 /* Use that stateid */
2852         } else if (truncate && state != NULL) {
2853                 struct nfs_lockowner lockowner = {
2854                         .l_owner = current->files,
2855                         .l_pid = current->tgid,
2856                 };
2857                 if (!nfs4_valid_open_stateid(state))
2858                         return -EBADF;
2859                 if (nfs4_select_rw_stateid(state, FMODE_WRITE, &lockowner,
2860                                 &arg->stateid, &delegation_cred) == -EIO)
2861                         return -EBADF;
2862         } else
2863                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
2864         if (delegation_cred)
2865                 msg.rpc_cred = delegation_cred;
2866
2867         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
2868
2869         put_rpccred(delegation_cred);
2870         if (status == 0 && state != NULL)
2871                 renew_lease(server, timestamp);
2872         trace_nfs4_setattr(inode, &arg->stateid, status);
2873         return status;
2874 }
2875
2876 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2877                            struct nfs_fattr *fattr, struct iattr *sattr,
2878                            struct nfs4_state *state, struct nfs4_label *ilabel,
2879                            struct nfs4_label *olabel)
2880 {
2881         struct nfs_server *server = NFS_SERVER(inode);
2882         struct nfs_setattrargs  arg = {
2883                 .fh             = NFS_FH(inode),
2884                 .iap            = sattr,
2885                 .server         = server,
2886                 .bitmask = server->attr_bitmask,
2887                 .label          = ilabel,
2888         };
2889         struct nfs_setattrres  res = {
2890                 .fattr          = fattr,
2891                 .label          = olabel,
2892                 .server         = server,
2893         };
2894         struct nfs4_exception exception = {
2895                 .state = state,
2896                 .inode = inode,
2897                 .stateid = &arg.stateid,
2898         };
2899         int err;
2900
2901         arg.bitmask = nfs4_bitmask(server, ilabel);
2902         if (ilabel)
2903                 arg.bitmask = nfs4_bitmask(server, olabel);
2904
2905         do {
2906                 err = _nfs4_do_setattr(inode, &arg, &res, cred, state);
2907                 switch (err) {
2908                 case -NFS4ERR_OPENMODE:
2909                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2910                                 pr_warn_once("NFSv4: server %s is incorrectly "
2911                                                 "applying open mode checks to "
2912                                                 "a SETATTR that is not "
2913                                                 "changing file size.\n",
2914                                                 server->nfs_client->cl_hostname);
2915                         }
2916                         if (state && !(state->state & FMODE_WRITE)) {
2917                                 err = -EBADF;
2918                                 if (sattr->ia_valid & ATTR_OPEN)
2919                                         err = -EACCES;
2920                                 goto out;
2921                         }
2922                 }
2923                 err = nfs4_handle_exception(server, err, &exception);
2924         } while (exception.retry);
2925 out:
2926         return err;
2927 }
2928
2929 static bool
2930 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
2931 {
2932         if (inode == NULL || !nfs_have_layout(inode))
2933                 return false;
2934
2935         return pnfs_wait_on_layoutreturn(inode, task);
2936 }
2937
2938 struct nfs4_closedata {
2939         struct inode *inode;
2940         struct nfs4_state *state;
2941         struct nfs_closeargs arg;
2942         struct nfs_closeres res;
2943         struct nfs_fattr fattr;
2944         unsigned long timestamp;
2945         bool roc;
2946         u32 roc_barrier;
2947 };
2948
2949 static void nfs4_free_closedata(void *data)
2950 {
2951         struct nfs4_closedata *calldata = data;
2952         struct nfs4_state_owner *sp = calldata->state->owner;
2953         struct super_block *sb = calldata->state->inode->i_sb;
2954
2955         if (calldata->roc)
2956                 pnfs_roc_release(calldata->state->inode);
2957         nfs4_put_open_state(calldata->state);
2958         nfs_free_seqid(calldata->arg.seqid);
2959         nfs4_put_state_owner(sp);
2960         nfs_sb_deactive(sb);
2961         kfree(calldata);
2962 }
2963
2964 static void nfs4_close_done(struct rpc_task *task, void *data)
2965 {
2966         struct nfs4_closedata *calldata = data;
2967         struct nfs4_state *state = calldata->state;
2968         struct nfs_server *server = NFS_SERVER(calldata->inode);
2969         nfs4_stateid *res_stateid = NULL;
2970
2971         dprintk("%s: begin!\n", __func__);
2972         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2973                 return;
2974         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2975         /* hmm. we are done with the inode, and in the process of freeing
2976          * the state_owner. we keep this around to process errors
2977          */
2978         switch (task->tk_status) {
2979                 case 0:
2980                         res_stateid = &calldata->res.stateid;
2981                         if (calldata->roc)
2982                                 pnfs_roc_set_barrier(state->inode,
2983                                                      calldata->roc_barrier);
2984                         renew_lease(server, calldata->timestamp);
2985                         break;
2986                 case -NFS4ERR_ADMIN_REVOKED:
2987                 case -NFS4ERR_STALE_STATEID:
2988                 case -NFS4ERR_OLD_STATEID:
2989                 case -NFS4ERR_BAD_STATEID:
2990                 case -NFS4ERR_EXPIRED:
2991                         if (!nfs4_stateid_match(&calldata->arg.stateid,
2992                                                 &state->open_stateid)) {
2993                                 rpc_restart_call_prepare(task);
2994                                 goto out_release;
2995                         }
2996                         if (calldata->arg.fmode == 0)
2997                                 break;
2998                 default:
2999                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
3000                                 rpc_restart_call_prepare(task);
3001                                 goto out_release;
3002                         }
3003         }
3004         nfs_clear_open_stateid(state, &calldata->arg.stateid,
3005                         res_stateid, calldata->arg.fmode);
3006 out_release:
3007         nfs_release_seqid(calldata->arg.seqid);
3008         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
3009         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
3010 }
3011
3012 static void nfs4_close_prepare(struct rpc_task *task, void *data)
3013 {
3014         struct nfs4_closedata *calldata = data;
3015         struct nfs4_state *state = calldata->state;
3016         struct inode *inode = calldata->inode;
3017         bool is_rdonly, is_wronly, is_rdwr;
3018         int call_close = 0;
3019
3020         dprintk("%s: begin!\n", __func__);
3021         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3022                 goto out_wait;
3023
3024         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
3025         spin_lock(&state->owner->so_lock);
3026         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
3027         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
3028         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
3029         nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
3030         /* Calculate the change in open mode */
3031         calldata->arg.fmode = 0;
3032         if (state->n_rdwr == 0) {
3033                 if (state->n_rdonly == 0)
3034                         call_close |= is_rdonly;
3035                 else if (is_rdonly)
3036                         calldata->arg.fmode |= FMODE_READ;
3037                 if (state->n_wronly == 0)
3038                         call_close |= is_wronly;
3039                 else if (is_wronly)
3040                         calldata->arg.fmode |= FMODE_WRITE;
3041                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
3042                         call_close |= is_rdwr;
3043         } else if (is_rdwr)
3044                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
3045
3046         if (!nfs4_valid_open_stateid(state))
3047                 call_close = 0;
3048         spin_unlock(&state->owner->so_lock);
3049
3050         if (!call_close) {
3051                 /* Note: exit _without_ calling nfs4_close_done */
3052                 goto out_no_action;
3053         }
3054
3055         if (nfs4_wait_on_layoutreturn(inode, task)) {
3056                 nfs_release_seqid(calldata->arg.seqid);
3057                 goto out_wait;
3058         }
3059
3060         if (calldata->arg.fmode == 0)
3061                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
3062         if (calldata->roc)
3063                 pnfs_roc_get_barrier(inode, &calldata->roc_barrier);
3064
3065         calldata->arg.share_access =
3066                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
3067                                 calldata->arg.fmode, 0);
3068
3069         nfs_fattr_init(calldata->res.fattr);
3070         calldata->timestamp = jiffies;
3071         if (nfs4_setup_sequence(NFS_SERVER(inode),
3072                                 &calldata->arg.seq_args,
3073                                 &calldata->res.seq_res,
3074                                 task) != 0)
3075                 nfs_release_seqid(calldata->arg.seqid);
3076         dprintk("%s: done!\n", __func__);
3077         return;
3078 out_no_action:
3079         task->tk_action = NULL;
3080 out_wait:
3081         nfs4_sequence_done(task, &calldata->res.seq_res);
3082 }
3083
3084 static const struct rpc_call_ops nfs4_close_ops = {
3085         .rpc_call_prepare = nfs4_close_prepare,
3086         .rpc_call_done = nfs4_close_done,
3087         .rpc_release = nfs4_free_closedata,
3088 };
3089
3090 static bool nfs4_roc(struct inode *inode)
3091 {
3092         if (!nfs_have_layout(inode))
3093                 return false;
3094         return pnfs_roc(inode);
3095 }
3096
3097 /*
3098  * It is possible for data to be read/written from a mem-mapped file
3099  * after the sys_close call (which hits the vfs layer as a flush).
3100  * This means that we can't safely call nfsv4 close on a file until
3101  * the inode is cleared. This in turn means that we are not good
3102  * NFSv4 citizens - we do not indicate to the server to update the file's
3103  * share state even when we are done with one of the three share
3104  * stateid's in the inode.
3105  *
3106  * NOTE: Caller must be holding the sp->so_owner semaphore!
3107  */
3108 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
3109 {
3110         struct nfs_server *server = NFS_SERVER(state->inode);
3111         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
3112         struct nfs4_closedata *calldata;
3113         struct nfs4_state_owner *sp = state->owner;
3114         struct rpc_task *task;
3115         struct rpc_message msg = {
3116                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
3117                 .rpc_cred = state->owner->so_cred,
3118         };
3119         struct rpc_task_setup task_setup_data = {
3120                 .rpc_client = server->client,
3121                 .rpc_message = &msg,
3122                 .callback_ops = &nfs4_close_ops,
3123                 .workqueue = nfsiod_workqueue,
3124                 .flags = RPC_TASK_ASYNC,
3125         };
3126         int status = -ENOMEM;
3127
3128         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
3129                 &task_setup_data.rpc_client, &msg);
3130
3131         calldata = kzalloc(sizeof(*calldata), gfp_mask);
3132         if (calldata == NULL)
3133                 goto out;
3134         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
3135         calldata->inode = state->inode;
3136         calldata->state = state;
3137         calldata->arg.fh = NFS_FH(state->inode);
3138         /* Serialization for the sequence id */
3139         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
3140         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
3141         if (IS_ERR(calldata->arg.seqid))
3142                 goto out_free_calldata;
3143         calldata->arg.fmode = 0;
3144         calldata->arg.bitmask = server->cache_consistency_bitmask;
3145         calldata->res.fattr = &calldata->fattr;
3146         calldata->res.seqid = calldata->arg.seqid;
3147         calldata->res.server = server;
3148         calldata->roc = nfs4_roc(state->inode);
3149         nfs_sb_active(calldata->inode->i_sb);
3150
3151         msg.rpc_argp = &calldata->arg;
3152         msg.rpc_resp = &calldata->res;
3153         task_setup_data.callback_data = calldata;
3154         task = rpc_run_task(&task_setup_data);
3155         if (IS_ERR(task))
3156                 return PTR_ERR(task);
3157         status = 0;
3158         if (wait)
3159                 status = rpc_wait_for_completion_task(task);
3160         rpc_put_task(task);
3161         return status;
3162 out_free_calldata:
3163         kfree(calldata);
3164 out:
3165         nfs4_put_open_state(state);
3166         nfs4_put_state_owner(sp);
3167         return status;
3168 }
3169
3170 static struct inode *
3171 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3172                 int open_flags, struct iattr *attr, int *opened)
3173 {
3174         struct nfs4_state *state;
3175         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3176
3177         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3178
3179         /* Protect against concurrent sillydeletes */
3180         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3181
3182         nfs4_label_release_security(label);
3183
3184         if (IS_ERR(state))
3185                 return ERR_CAST(state);
3186         return state->inode;
3187 }
3188
3189 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3190 {
3191         if (ctx->state == NULL)
3192                 return;
3193         if (is_sync)
3194                 nfs4_close_sync(ctx->state, ctx->mode);
3195         else
3196                 nfs4_close_state(ctx->state, ctx->mode);
3197 }
3198
3199 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3200 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3201 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
3202
3203 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3204 {
3205         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3206         struct nfs4_server_caps_arg args = {
3207                 .fhandle = fhandle,
3208                 .bitmask = bitmask,
3209         };
3210         struct nfs4_server_caps_res res = {};
3211         struct rpc_message msg = {
3212                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3213                 .rpc_argp = &args,
3214                 .rpc_resp = &res,
3215         };
3216         int status;
3217
3218         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3219                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3220                      FATTR4_WORD0_LINK_SUPPORT |
3221                      FATTR4_WORD0_SYMLINK_SUPPORT |
3222                      FATTR4_WORD0_ACLSUPPORT;
3223         if (minorversion)
3224                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3225
3226         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3227         if (status == 0) {
3228                 /* Sanity check the server answers */
3229                 switch (minorversion) {
3230                 case 0:
3231                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3232                         res.attr_bitmask[2] = 0;
3233                         break;
3234                 case 1:
3235                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3236                         break;
3237                 case 2:
3238                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3239                 }
3240                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3241                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3242                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3243                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3244                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3245                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
3246                                 NFS_CAP_SECURITY_LABEL);
3247                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3248                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3249                         server->caps |= NFS_CAP_ACLS;
3250                 if (res.has_links != 0)
3251                         server->caps |= NFS_CAP_HARDLINKS;
3252                 if (res.has_symlinks != 0)
3253                         server->caps |= NFS_CAP_SYMLINKS;
3254                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3255                         server->caps |= NFS_CAP_FILEID;
3256                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3257                         server->caps |= NFS_CAP_MODE;
3258                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3259                         server->caps |= NFS_CAP_NLINK;
3260                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3261                         server->caps |= NFS_CAP_OWNER;
3262                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3263                         server->caps |= NFS_CAP_OWNER_GROUP;
3264                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3265                         server->caps |= NFS_CAP_ATIME;
3266                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3267                         server->caps |= NFS_CAP_CTIME;
3268                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3269                         server->caps |= NFS_CAP_MTIME;
3270 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3271                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3272                         server->caps |= NFS_CAP_SECURITY_LABEL;
3273 #endif
3274                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3275                                 sizeof(server->attr_bitmask));
3276                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3277
3278                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3279                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3280                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3281                 server->cache_consistency_bitmask[2] = 0;
3282                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3283                         sizeof(server->exclcreat_bitmask));
3284                 server->acl_bitmask = res.acl_bitmask;
3285                 server->fh_expire_type = res.fh_expire_type;
3286         }
3287
3288         return status;
3289 }
3290
3291 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3292 {
3293         struct nfs4_exception exception = { };
3294         int err;
3295         do {
3296                 err = nfs4_handle_exception(server,
3297                                 _nfs4_server_capabilities(server, fhandle),
3298                                 &exception);
3299         } while (exception.retry);
3300         return err;
3301 }
3302
3303 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3304                 struct nfs_fsinfo *info)
3305 {
3306         u32 bitmask[3];
3307         struct nfs4_lookup_root_arg args = {
3308                 .bitmask = bitmask,
3309         };
3310         struct nfs4_lookup_res res = {
3311                 .server = server,
3312                 .fattr = info->fattr,
3313                 .fh = fhandle,
3314         };
3315         struct rpc_message msg = {
3316                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3317                 .rpc_argp = &args,
3318                 .rpc_resp = &res,
3319         };
3320
3321         bitmask[0] = nfs4_fattr_bitmap[0];
3322         bitmask[1] = nfs4_fattr_bitmap[1];
3323         /*
3324          * Process the label in the upcoming getfattr
3325          */
3326         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3327
3328         nfs_fattr_init(info->fattr);
3329         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3330 }
3331
3332 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3333                 struct nfs_fsinfo *info)
3334 {
3335         struct nfs4_exception exception = { };
3336         int err;
3337         do {
3338                 err = _nfs4_lookup_root(server, fhandle, info);
3339                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3340                 switch (err) {
3341                 case 0:
3342                 case -NFS4ERR_WRONGSEC:
3343                         goto out;
3344                 default:
3345                         err = nfs4_handle_exception(server, err, &exception);
3346                 }
3347         } while (exception.retry);
3348 out:
3349         return err;
3350 }
3351
3352 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3353                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3354 {
3355         struct rpc_auth_create_args auth_args = {
3356                 .pseudoflavor = flavor,
3357         };
3358         struct rpc_auth *auth;
3359         int ret;
3360
3361         auth = rpcauth_create(&auth_args, server->client);
3362         if (IS_ERR(auth)) {
3363                 ret = -EACCES;
3364                 goto out;
3365         }
3366         ret = nfs4_lookup_root(server, fhandle, info);
3367 out:
3368         return ret;
3369 }
3370
3371 /*
3372  * Retry pseudoroot lookup with various security flavors.  We do this when:
3373  *
3374  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3375  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3376  *
3377  * Returns zero on success, or a negative NFS4ERR value, or a
3378  * negative errno value.
3379  */
3380 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3381                               struct nfs_fsinfo *info)
3382 {
3383         /* Per 3530bis 15.33.5 */
3384         static const rpc_authflavor_t flav_array[] = {
3385                 RPC_AUTH_GSS_KRB5P,
3386                 RPC_AUTH_GSS_KRB5I,
3387                 RPC_AUTH_GSS_KRB5,
3388                 RPC_AUTH_UNIX,                  /* courtesy */
3389                 RPC_AUTH_NULL,
3390         };
3391         int status = -EPERM;
3392         size_t i;
3393
3394         if (server->auth_info.flavor_len > 0) {
3395                 /* try each flavor specified by user */
3396                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3397                         status = nfs4_lookup_root_sec(server, fhandle, info,
3398                                                 server->auth_info.flavors[i]);
3399                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3400                                 continue;
3401                         break;
3402                 }
3403         } else {
3404                 /* no flavors specified by user, try default list */
3405                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3406                         status = nfs4_lookup_root_sec(server, fhandle, info,
3407                                                       flav_array[i]);
3408                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3409                                 continue;
3410                         break;
3411                 }
3412         }
3413
3414         /*
3415          * -EACCESS could mean that the user doesn't have correct permissions
3416          * to access the mount.  It could also mean that we tried to mount
3417          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3418          * existing mount programs don't handle -EACCES very well so it should
3419          * be mapped to -EPERM instead.
3420          */
3421         if (status == -EACCES)
3422                 status = -EPERM;
3423         return status;
3424 }
3425
3426 /**
3427  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3428  * @server: initialized nfs_server handle
3429  * @fhandle: we fill in the pseudo-fs root file handle
3430  * @info: we fill in an FSINFO struct
3431  * @auth_probe: probe the auth flavours
3432  *
3433  * Returns zero on success, or a negative errno.
3434  */
3435 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3436                          struct nfs_fsinfo *info,
3437                          bool auth_probe)
3438 {
3439         int status = 0;
3440
3441         if (!auth_probe)
3442                 status = nfs4_lookup_root(server, fhandle, info);
3443
3444         if (auth_probe || status == NFS4ERR_WRONGSEC)
3445                 status = server->nfs_client->cl_mvops->find_root_sec(server,
3446                                 fhandle, info);
3447
3448         if (status == 0)
3449                 status = nfs4_server_capabilities(server, fhandle);
3450         if (status == 0)
3451                 status = nfs4_do_fsinfo(server, fhandle, info);
3452
3453         return nfs4_map_errors(status);
3454 }
3455
3456 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3457                               struct nfs_fsinfo *info)
3458 {
3459         int error;
3460         struct nfs_fattr *fattr = info->fattr;
3461         struct nfs4_label *label = NULL;
3462
3463         error = nfs4_server_capabilities(server, mntfh);
3464         if (error < 0) {
3465                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3466                 return error;
3467         }
3468
3469         label = nfs4_label_alloc(server, GFP_KERNEL);
3470         if (IS_ERR(label))
3471                 return PTR_ERR(label);
3472
3473         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3474         if (error < 0) {
3475                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3476                 goto err_free_label;
3477         }
3478
3479         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3480             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3481                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3482
3483 err_free_label:
3484         nfs4_label_free(label);
3485
3486         return error;
3487 }
3488
3489 /*
3490  * Get locations and (maybe) other attributes of a referral.
3491  * Note that we'll actually follow the referral later when
3492  * we detect fsid mismatch in inode revalidation
3493  */
3494 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3495                              const struct qstr *name, struct nfs_fattr *fattr,
3496                              struct nfs_fh *fhandle)
3497 {
3498         int status = -ENOMEM;
3499         struct page *page = NULL;
3500         struct nfs4_fs_locations *locations = NULL;
3501
3502         page = alloc_page(GFP_KERNEL);
3503         if (page == NULL)
3504                 goto out;
3505         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3506         if (locations == NULL)
3507                 goto out;
3508
3509         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3510         if (status != 0)
3511                 goto out;
3512
3513         /*
3514          * If the fsid didn't change, this is a migration event, not a
3515          * referral.  Cause us to drop into the exception handler, which
3516          * will kick off migration recovery.
3517          */
3518         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3519                 dprintk("%s: server did not return a different fsid for"
3520                         " a referral at %s\n", __func__, name->name);
3521                 status = -NFS4ERR_MOVED;
3522                 goto out;
3523         }
3524         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3525         nfs_fixup_referral_attributes(&locations->fattr);
3526
3527         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3528         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3529         memset(fhandle, 0, sizeof(struct nfs_fh));
3530 out:
3531         if (page)
3532                 __free_page(page);
3533         kfree(locations);
3534         return status;
3535 }
3536
3537 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3538                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3539 {
3540         struct nfs4_getattr_arg args = {
3541                 .fh = fhandle,
3542                 .bitmask = server->attr_bitmask,
3543         };
3544         struct nfs4_getattr_res res = {
3545                 .fattr = fattr,
3546                 .label = label,
3547                 .server = server,
3548         };
3549         struct rpc_message msg = {
3550                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3551                 .rpc_argp = &args,
3552                 .rpc_resp = &res,
3553         };
3554
3555         args.bitmask = nfs4_bitmask(server, label);
3556
3557         nfs_fattr_init(fattr);
3558         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3559 }
3560
3561 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3562                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3563 {
3564         struct nfs4_exception exception = { };
3565         int err;
3566         do {
3567                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3568                 trace_nfs4_getattr(server, fhandle, fattr, err);
3569                 err = nfs4_handle_exception(server, err,
3570                                 &exception);
3571         } while (exception.retry);
3572         return err;
3573 }
3574
3575 /*
3576  * The file is not closed if it is opened due to the a request to change
3577  * the size of the file. The open call will not be needed once the
3578  * VFS layer lookup-intents are implemented.
3579  *
3580  * Close is called when the inode is destroyed.
3581  * If we haven't opened the file for O_WRONLY, we
3582  * need to in the size_change case to obtain a stateid.
3583  *
3584  * Got race?
3585  * Because OPEN is always done by name in nfsv4, it is
3586  * possible that we opened a different file by the same
3587  * name.  We can recognize this race condition, but we
3588  * can't do anything about it besides returning an error.
3589  *
3590  * This will be fixed with VFS changes (lookup-intent).
3591  */
3592 static int
3593 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3594                   struct iattr *sattr)
3595 {
3596         struct inode *inode = d_inode(dentry);
3597         struct rpc_cred *cred = NULL;
3598         struct nfs4_state *state = NULL;
3599         struct nfs4_label *label = NULL;
3600         int status;
3601
3602         if (pnfs_ld_layoutret_on_setattr(inode) &&
3603             sattr->ia_valid & ATTR_SIZE &&
3604             sattr->ia_size < i_size_read(inode))
3605                 pnfs_commit_and_return_layout(inode);
3606
3607         nfs_fattr_init(fattr);
3608
3609         /* Deal with open(O_TRUNC) */
3610         if (sattr->ia_valid & ATTR_OPEN)
3611                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3612
3613         /* Optimization: if the end result is no change, don't RPC */
3614         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3615                 return 0;
3616
3617         /* Search for an existing open(O_WRITE) file */
3618         if (sattr->ia_valid & ATTR_FILE) {
3619                 struct nfs_open_context *ctx;
3620
3621                 ctx = nfs_file_open_context(sattr->ia_file);
3622                 if (ctx) {
3623                         cred = ctx->cred;
3624                         state = ctx->state;
3625                 }
3626         }
3627
3628         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3629         if (IS_ERR(label))
3630                 return PTR_ERR(label);
3631
3632         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3633         if (status == 0) {
3634                 nfs_setattr_update_inode(inode, sattr, fattr);
3635                 nfs_setsecurity(inode, fattr, label);
3636         }
3637         nfs4_label_free(label);
3638         return status;
3639 }
3640
3641 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3642                 const struct qstr *name, struct nfs_fh *fhandle,
3643                 struct nfs_fattr *fattr, struct nfs4_label *label)
3644 {
3645         struct nfs_server *server = NFS_SERVER(dir);
3646         int                    status;
3647         struct nfs4_lookup_arg args = {
3648                 .bitmask = server->attr_bitmask,
3649                 .dir_fh = NFS_FH(dir),
3650                 .name = name,
3651         };
3652         struct nfs4_lookup_res res = {
3653                 .server = server,
3654                 .fattr = fattr,
3655                 .label = label,
3656                 .fh = fhandle,
3657         };
3658         struct rpc_message msg = {
3659                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3660                 .rpc_argp = &args,
3661                 .rpc_resp = &res,
3662         };
3663
3664         args.bitmask = nfs4_bitmask(server, label);
3665
3666         nfs_fattr_init(fattr);
3667
3668         dprintk("NFS call  lookup %s\n", name->name);
3669         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3670         dprintk("NFS reply lookup: %d\n", status);
3671         return status;
3672 }
3673
3674 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3675 {
3676         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3677                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3678         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3679         fattr->nlink = 2;
3680 }
3681
3682 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3683                                    const struct qstr *name, struct nfs_fh *fhandle,
3684                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3685 {
3686         struct nfs4_exception exception = { };
3687         struct rpc_clnt *client = *clnt;
3688         int err;
3689         do {
3690                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3691                 trace_nfs4_lookup(dir, name, err);
3692                 switch (err) {
3693                 case -NFS4ERR_BADNAME:
3694                         err = -ENOENT;
3695                         goto out;
3696                 case -NFS4ERR_MOVED:
3697                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3698                         if (err == -NFS4ERR_MOVED)
3699                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3700                         goto out;
3701                 case -NFS4ERR_WRONGSEC:
3702                         err = -EPERM;
3703                         if (client != *clnt)
3704                                 goto out;
3705                         client = nfs4_negotiate_security(client, dir, name);
3706                         if (IS_ERR(client))
3707                                 return PTR_ERR(client);
3708
3709                         exception.retry = 1;
3710                         break;
3711                 default:
3712                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3713                 }
3714         } while (exception.retry);
3715
3716 out:
3717         if (err == 0)
3718                 *clnt = client;
3719         else if (client != *clnt)
3720                 rpc_shutdown_client(client);
3721
3722         return err;
3723 }
3724
3725 static int nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
3726                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3727                             struct nfs4_label *label)
3728 {
3729         int status;
3730         struct rpc_clnt *client = NFS_CLIENT(dir);
3731
3732         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3733         if (client != NFS_CLIENT(dir)) {
3734                 rpc_shutdown_client(client);
3735                 nfs_fixup_secinfo_attributes(fattr);
3736         }
3737         return status;
3738 }
3739
3740 struct rpc_clnt *
3741 nfs4_proc_lookup_mountpoint(struct inode *dir, const struct qstr *name,
3742                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3743 {
3744         struct rpc_clnt *client = NFS_CLIENT(dir);
3745         int status;
3746
3747         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3748         if (status < 0)
3749                 return ERR_PTR(status);
3750         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3751 }
3752
3753 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3754 {
3755         struct nfs_server *server = NFS_SERVER(inode);
3756         struct nfs4_accessargs args = {
3757                 .fh = NFS_FH(inode),
3758                 .bitmask = server->cache_consistency_bitmask,
3759         };
3760         struct nfs4_accessres res = {
3761                 .server = server,
3762         };
3763         struct rpc_message msg = {
3764                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3765                 .rpc_argp = &args,
3766                 .rpc_resp = &res,
3767                 .rpc_cred = entry->cred,
3768         };
3769         int mode = entry->mask;
3770         int status = 0;
3771
3772         /*
3773          * Determine which access bits we want to ask for...
3774          */
3775         if (mode & MAY_READ)
3776                 args.access |= NFS4_ACCESS_READ;
3777         if (S_ISDIR(inode->i_mode)) {
3778                 if (mode & MAY_WRITE)
3779                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3780                 if (mode & MAY_EXEC)
3781                         args.access |= NFS4_ACCESS_LOOKUP;
3782         } else {
3783                 if (mode & MAY_WRITE)
3784                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3785                 if (mode & MAY_EXEC)
3786                         args.access |= NFS4_ACCESS_EXECUTE;
3787         }
3788
3789         res.fattr = nfs_alloc_fattr();
3790         if (res.fattr == NULL)
3791                 return -ENOMEM;
3792
3793         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3794         if (!status) {
3795                 nfs_access_set_mask(entry, res.access);
3796                 nfs_refresh_inode(inode, res.fattr);
3797         }
3798         nfs_free_fattr(res.fattr);
3799         return status;
3800 }
3801
3802 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3803 {
3804         struct nfs4_exception exception = { };
3805         int err;
3806         do {
3807                 err = _nfs4_proc_access(inode, entry);
3808                 trace_nfs4_access(inode, err);
3809                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3810                                 &exception);
3811         } while (exception.retry);
3812         return err;
3813 }
3814
3815 /*
3816  * TODO: For the time being, we don't try to get any attributes
3817  * along with any of the zero-copy operations READ, READDIR,
3818  * READLINK, WRITE.
3819  *
3820  * In the case of the first three, we want to put the GETATTR
3821  * after the read-type operation -- this is because it is hard
3822  * to predict the length of a GETATTR response in v4, and thus
3823  * align the READ data correctly.  This means that the GETATTR
3824  * may end up partially falling into the page cache, and we should
3825  * shift it into the 'tail' of the xdr_buf before processing.
3826  * To do this efficiently, we need to know the total length
3827  * of data received, which doesn't seem to be available outside
3828  * of the RPC layer.
3829  *
3830  * In the case of WRITE, we also want to put the GETATTR after
3831  * the operation -- in this case because we want to make sure
3832  * we get the post-operation mtime and size.
3833  *
3834  * Both of these changes to the XDR layer would in fact be quite
3835  * minor, but I decided to leave them for a subsequent patch.
3836  */
3837 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3838                 unsigned int pgbase, unsigned int pglen)
3839 {
3840         struct nfs4_readlink args = {
3841                 .fh       = NFS_FH(inode),
3842                 .pgbase   = pgbase,
3843                 .pglen    = pglen,
3844                 .pages    = &page,
3845         };
3846         struct nfs4_readlink_res res;
3847         struct rpc_message msg = {
3848                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3849                 .rpc_argp = &args,
3850                 .rpc_resp = &res,
3851         };
3852
3853         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3854 }
3855
3856 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3857                 unsigned int pgbase, unsigned int pglen)
3858 {
3859         struct nfs4_exception exception = { };
3860         int err;
3861         do {
3862                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3863                 trace_nfs4_readlink(inode, err);
3864                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3865                                 &exception);
3866         } while (exception.retry);
3867         return err;
3868 }
3869
3870 /*
3871  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3872  */
3873 static int
3874 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3875                  int flags)
3876 {
3877         struct nfs4_label l, *ilabel = NULL;
3878         struct nfs_open_context *ctx;
3879         struct nfs4_state *state;
3880         int status = 0;
3881
3882         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3883         if (IS_ERR(ctx))
3884                 return PTR_ERR(ctx);
3885
3886         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3887
3888         sattr->ia_mode &= ~current_umask();
3889         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
3890         if (IS_ERR(state)) {
3891                 status = PTR_ERR(state);
3892                 goto out;
3893         }
3894 out:
3895         nfs4_label_release_security(ilabel);
3896         put_nfs_open_context(ctx);
3897         return status;
3898 }
3899
3900 static int _nfs4_proc_remove(struct inode *dir, const struct qstr *name)
3901 {
3902         struct nfs_server *server = NFS_SERVER(dir);
3903         struct nfs_removeargs args = {
3904                 .fh = NFS_FH(dir),
3905                 .name = *name,
3906         };
3907         struct nfs_removeres res = {
3908                 .server = server,
3909         };
3910         struct rpc_message msg = {
3911                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3912                 .rpc_argp = &args,
3913                 .rpc_resp = &res,
3914         };
3915         int status;
3916
3917         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3918         if (status == 0)
3919                 update_changeattr(dir, &res.cinfo);
3920         return status;
3921 }
3922
3923 static int nfs4_proc_remove(struct inode *dir, const struct qstr *name)
3924 {
3925         struct nfs4_exception exception = { };
3926         int err;
3927         do {
3928                 err = _nfs4_proc_remove(dir, name);
3929                 trace_nfs4_remove(dir, name, err);
3930                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3931                                 &exception);
3932         } while (exception.retry);
3933         return err;
3934 }
3935
3936 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3937 {
3938         struct nfs_server *server = NFS_SERVER(dir);
3939         struct nfs_removeargs *args = msg->rpc_argp;
3940         struct nfs_removeres *res = msg->rpc_resp;
3941
3942         res->server = server;
3943         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3944         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3945
3946         nfs_fattr_init(res->dir_attr);
3947 }
3948
3949 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3950 {
3951         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb),
3952                         &data->args.seq_args,
3953                         &data->res.seq_res,
3954                         task);
3955 }
3956
3957 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3958 {
3959         struct nfs_unlinkdata *data = task->tk_calldata;
3960         struct nfs_removeres *res = &data->res;
3961
3962         if (!nfs4_sequence_done(task, &res->seq_res))
3963                 return 0;
3964         if (nfs4_async_handle_error(task, res->server, NULL,
3965                                     &data->timeout) == -EAGAIN)
3966                 return 0;
3967         update_changeattr(dir, &res->cinfo);
3968         return 1;
3969 }
3970
3971 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3972 {
3973         struct nfs_server *server = NFS_SERVER(dir);
3974         struct nfs_renameargs *arg = msg->rpc_argp;
3975         struct nfs_renameres *res = msg->rpc_resp;
3976
3977         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3978         res->server = server;
3979         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3980 }
3981
3982 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3983 {
3984         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3985                         &data->args.seq_args,
3986                         &data->res.seq_res,
3987                         task);
3988 }
3989
3990 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3991                                  struct inode *new_dir)
3992 {
3993         struct nfs_renamedata *data = task->tk_calldata;
3994         struct nfs_renameres *res = &data->res;
3995
3996         if (!nfs4_sequence_done(task, &res->seq_res))
3997                 return 0;
3998         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3999                 return 0;
4000
4001         update_changeattr(old_dir, &res->old_cinfo);
4002         update_changeattr(new_dir, &res->new_cinfo);
4003         return 1;
4004 }
4005
4006 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4007 {
4008         struct nfs_server *server = NFS_SERVER(inode);
4009         struct nfs4_link_arg arg = {
4010                 .fh     = NFS_FH(inode),
4011                 .dir_fh = NFS_FH(dir),
4012                 .name   = name,
4013                 .bitmask = server->attr_bitmask,
4014         };
4015         struct nfs4_link_res res = {
4016                 .server = server,
4017                 .label = NULL,
4018         };
4019         struct rpc_message msg = {
4020                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
4021                 .rpc_argp = &arg,
4022                 .rpc_resp = &res,
4023         };
4024         int status = -ENOMEM;
4025
4026         res.fattr = nfs_alloc_fattr();
4027         if (res.fattr == NULL)
4028                 goto out;
4029
4030         res.label = nfs4_label_alloc(server, GFP_KERNEL);
4031         if (IS_ERR(res.label)) {
4032                 status = PTR_ERR(res.label);
4033                 goto out;
4034         }
4035         arg.bitmask = nfs4_bitmask(server, res.label);
4036
4037         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4038         if (!status) {
4039                 update_changeattr(dir, &res.cinfo);
4040                 status = nfs_post_op_update_inode(inode, res.fattr);
4041                 if (!status)
4042                         nfs_setsecurity(inode, res.fattr, res.label);
4043         }
4044
4045
4046         nfs4_label_free(res.label);
4047
4048 out:
4049         nfs_free_fattr(res.fattr);
4050         return status;
4051 }
4052
4053 static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
4054 {
4055         struct nfs4_exception exception = { };
4056         int err;
4057         do {
4058                 err = nfs4_handle_exception(NFS_SERVER(inode),
4059                                 _nfs4_proc_link(inode, dir, name),
4060                                 &exception);
4061         } while (exception.retry);
4062         return err;
4063 }
4064
4065 struct nfs4_createdata {
4066         struct rpc_message msg;
4067         struct nfs4_create_arg arg;
4068         struct nfs4_create_res res;
4069         struct nfs_fh fh;
4070         struct nfs_fattr fattr;
4071         struct nfs4_label *label;
4072 };
4073
4074 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
4075                 const struct qstr *name, struct iattr *sattr, u32 ftype)
4076 {
4077         struct nfs4_createdata *data;
4078
4079         data = kzalloc(sizeof(*data), GFP_KERNEL);
4080         if (data != NULL) {
4081                 struct nfs_server *server = NFS_SERVER(dir);
4082
4083                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
4084                 if (IS_ERR(data->label))
4085                         goto out_free;
4086
4087                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
4088                 data->msg.rpc_argp = &data->arg;
4089                 data->msg.rpc_resp = &data->res;
4090                 data->arg.dir_fh = NFS_FH(dir);
4091                 data->arg.server = server;
4092                 data->arg.name = name;
4093                 data->arg.attrs = sattr;
4094                 data->arg.ftype = ftype;
4095                 data->arg.bitmask = nfs4_bitmask(server, data->label);
4096                 data->res.server = server;
4097                 data->res.fh = &data->fh;
4098                 data->res.fattr = &data->fattr;
4099                 data->res.label = data->label;
4100                 nfs_fattr_init(data->res.fattr);
4101         }
4102         return data;
4103 out_free:
4104         kfree(data);
4105         return NULL;
4106 }
4107
4108 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
4109 {
4110         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
4111                                     &data->arg.seq_args, &data->res.seq_res, 1);
4112         if (status == 0) {
4113                 update_changeattr(dir, &data->res.dir_cinfo);
4114                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
4115         }
4116         return status;
4117 }
4118
4119 static void nfs4_free_createdata(struct nfs4_createdata *data)
4120 {
4121         nfs4_label_free(data->label);
4122         kfree(data);
4123 }
4124
4125 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4126                 struct page *page, unsigned int len, struct iattr *sattr,
4127                 struct nfs4_label *label)
4128 {
4129         struct nfs4_createdata *data;
4130         int status = -ENAMETOOLONG;
4131
4132         if (len > NFS4_MAXPATHLEN)
4133                 goto out;
4134
4135         status = -ENOMEM;
4136         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
4137         if (data == NULL)
4138                 goto out;
4139
4140         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
4141         data->arg.u.symlink.pages = &page;
4142         data->arg.u.symlink.len = len;
4143         data->arg.label = label;
4144
4145         status = nfs4_do_create(dir, dentry, data);
4146
4147         nfs4_free_createdata(data);
4148 out:
4149         return status;
4150 }
4151
4152 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4153                 struct page *page, unsigned int len, struct iattr *sattr)
4154 {
4155         struct nfs4_exception exception = { };
4156         struct nfs4_label l, *label = NULL;
4157         int err;
4158
4159         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4160
4161         do {
4162                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
4163                 trace_nfs4_symlink(dir, &dentry->d_name, err);
4164                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4165                                 &exception);
4166         } while (exception.retry);
4167
4168         nfs4_label_release_security(label);
4169         return err;
4170 }
4171
4172 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4173                 struct iattr *sattr, struct nfs4_label *label)
4174 {
4175         struct nfs4_createdata *data;
4176         int status = -ENOMEM;
4177
4178         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4179         if (data == NULL)
4180                 goto out;
4181
4182         data->arg.label = label;
4183         status = nfs4_do_create(dir, dentry, data);
4184
4185         nfs4_free_createdata(data);
4186 out:
4187         return status;
4188 }
4189
4190 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4191                 struct iattr *sattr)
4192 {
4193         struct nfs4_exception exception = { };
4194         struct nfs4_label l, *label = NULL;
4195         int err;
4196
4197         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4198
4199         sattr->ia_mode &= ~current_umask();
4200         do {
4201                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4202                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4203                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4204                                 &exception);
4205         } while (exception.retry);
4206         nfs4_label_release_security(label);
4207
4208         return err;
4209 }
4210
4211 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4212                 u64 cookie, struct page **pages, unsigned int count, int plus)
4213 {
4214         struct inode            *dir = d_inode(dentry);
4215         struct nfs4_readdir_arg args = {
4216                 .fh = NFS_FH(dir),
4217                 .pages = pages,
4218                 .pgbase = 0,
4219                 .count = count,
4220                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4221                 .plus = plus,
4222         };
4223         struct nfs4_readdir_res res;
4224         struct rpc_message msg = {
4225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4226                 .rpc_argp = &args,
4227                 .rpc_resp = &res,
4228                 .rpc_cred = cred,
4229         };
4230         int                     status;
4231
4232         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4233                         dentry,
4234                         (unsigned long long)cookie);
4235         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4236         res.pgbase = args.pgbase;
4237         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4238         if (status >= 0) {
4239                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4240                 status += args.pgbase;
4241         }
4242
4243         nfs_invalidate_atime(dir);
4244
4245         dprintk("%s: returns %d\n", __func__, status);
4246         return status;
4247 }
4248
4249 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4250                 u64 cookie, struct page **pages, unsigned int count, int plus)
4251 {
4252         struct nfs4_exception exception = { };
4253         int err;
4254         do {
4255                 err = _nfs4_proc_readdir(dentry, cred, cookie,
4256                                 pages, count, plus);
4257                 trace_nfs4_readdir(d_inode(dentry), err);
4258                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4259                                 &exception);
4260         } while (exception.retry);
4261         return err;
4262 }
4263
4264 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4265                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4266 {
4267         struct nfs4_createdata *data;
4268         int mode = sattr->ia_mode;
4269         int status = -ENOMEM;
4270
4271         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
4272         if (data == NULL)
4273                 goto out;
4274
4275         if (S_ISFIFO(mode))
4276                 data->arg.ftype = NF4FIFO;
4277         else if (S_ISBLK(mode)) {
4278                 data->arg.ftype = NF4BLK;
4279                 data->arg.u.device.specdata1 = MAJOR(rdev);
4280                 data->arg.u.device.specdata2 = MINOR(rdev);
4281         }
4282         else if (S_ISCHR(mode)) {
4283                 data->arg.ftype = NF4CHR;
4284                 data->arg.u.device.specdata1 = MAJOR(rdev);
4285                 data->arg.u.device.specdata2 = MINOR(rdev);
4286         } else if (!S_ISSOCK(mode)) {
4287                 status = -EINVAL;
4288                 goto out_free;
4289         }
4290
4291         data->arg.label = label;
4292         status = nfs4_do_create(dir, dentry, data);
4293 out_free:
4294         nfs4_free_createdata(data);
4295 out:
4296         return status;
4297 }
4298
4299 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4300                 struct iattr *sattr, dev_t rdev)
4301 {
4302         struct nfs4_exception exception = { };
4303         struct nfs4_label l, *label = NULL;
4304         int err;
4305
4306         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4307
4308         sattr->ia_mode &= ~current_umask();
4309         do {
4310                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4311                 trace_nfs4_mknod(dir, &dentry->d_name, err);
4312                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4313                                 &exception);
4314         } while (exception.retry);
4315
4316         nfs4_label_release_security(label);
4317
4318         return err;
4319 }
4320
4321 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
4322                  struct nfs_fsstat *fsstat)
4323 {
4324         struct nfs4_statfs_arg args = {
4325                 .fh = fhandle,
4326                 .bitmask = server->attr_bitmask,
4327         };
4328         struct nfs4_statfs_res res = {
4329                 .fsstat = fsstat,
4330         };
4331         struct rpc_message msg = {
4332                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
4333                 .rpc_argp = &args,
4334                 .rpc_resp = &res,
4335         };
4336
4337         nfs_fattr_init(fsstat->fattr);
4338         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4339 }
4340
4341 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4342 {
4343         struct nfs4_exception exception = { };
4344         int err;
4345         do {
4346                 err = nfs4_handle_exception(server,
4347                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4348                                 &exception);
4349         } while (exception.retry);
4350         return err;
4351 }
4352
4353 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4354                 struct nfs_fsinfo *fsinfo)
4355 {
4356         struct nfs4_fsinfo_arg args = {
4357                 .fh = fhandle,
4358                 .bitmask = server->attr_bitmask,
4359         };
4360         struct nfs4_fsinfo_res res = {
4361                 .fsinfo = fsinfo,
4362         };
4363         struct rpc_message msg = {
4364                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4365                 .rpc_argp = &args,
4366                 .rpc_resp = &res,
4367         };
4368
4369         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4370 }
4371
4372 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4373 {
4374         struct nfs4_exception exception = { };
4375         unsigned long now = jiffies;
4376         int err;
4377
4378         do {
4379                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4380                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4381                 if (err == 0) {
4382                         nfs4_set_lease_period(server->nfs_client,
4383                                         fsinfo->lease_time * HZ,
4384                                         now);
4385                         break;
4386                 }
4387                 err = nfs4_handle_exception(server, err, &exception);
4388         } while (exception.retry);
4389         return err;
4390 }
4391
4392 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4393 {
4394         int error;
4395
4396         nfs_fattr_init(fsinfo->fattr);
4397         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4398         if (error == 0) {
4399                 /* block layout checks this! */
4400                 server->pnfs_blksize = fsinfo->blksize;
4401                 set_pnfs_layoutdriver(server, fhandle, fsinfo);
4402         }
4403
4404         return error;
4405 }
4406
4407 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4408                 struct nfs_pathconf *pathconf)
4409 {
4410         struct nfs4_pathconf_arg args = {
4411                 .fh = fhandle,
4412                 .bitmask = server->attr_bitmask,
4413         };
4414         struct nfs4_pathconf_res res = {
4415                 .pathconf = pathconf,
4416         };
4417         struct rpc_message msg = {
4418                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4419                 .rpc_argp = &args,
4420                 .rpc_resp = &res,
4421         };
4422
4423         /* None of the pathconf attributes are mandatory to implement */
4424         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4425                 memset(pathconf, 0, sizeof(*pathconf));
4426                 return 0;
4427         }
4428
4429         nfs_fattr_init(pathconf->fattr);
4430         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4431 }
4432
4433 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4434                 struct nfs_pathconf *pathconf)
4435 {
4436         struct nfs4_exception exception = { };
4437         int err;
4438
4439         do {
4440                 err = nfs4_handle_exception(server,
4441                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4442                                 &exception);
4443         } while (exception.retry);
4444         return err;
4445 }
4446
4447 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4448                 const struct nfs_open_context *ctx,
4449                 const struct nfs_lock_context *l_ctx,
4450                 fmode_t fmode)
4451 {
4452         const struct nfs_lockowner *lockowner = NULL;
4453
4454         if (l_ctx != NULL)
4455                 lockowner = &l_ctx->lockowner;
4456         return nfs4_select_rw_stateid(ctx->state, fmode, lockowner, stateid, NULL);
4457 }
4458 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4459
4460 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4461                 const struct nfs_open_context *ctx,
4462                 const struct nfs_lock_context *l_ctx,
4463                 fmode_t fmode)
4464 {
4465         nfs4_stateid current_stateid;
4466
4467         /* If the current stateid represents a lost lock, then exit */
4468         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4469                 return true;
4470         return nfs4_stateid_match(stateid, &current_stateid);
4471 }
4472
4473 static bool nfs4_error_stateid_expired(int err)
4474 {
4475         switch (err) {
4476         case -NFS4ERR_DELEG_REVOKED:
4477         case -NFS4ERR_ADMIN_REVOKED:
4478         case -NFS4ERR_BAD_STATEID:
4479         case -NFS4ERR_STALE_STATEID:
4480         case -NFS4ERR_OLD_STATEID:
4481         case -NFS4ERR_OPENMODE:
4482         case -NFS4ERR_EXPIRED:
4483                 return true;
4484         }
4485         return false;
4486 }
4487
4488 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4489 {
4490         nfs_invalidate_atime(hdr->inode);
4491 }
4492
4493 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4494 {
4495         struct nfs_server *server = NFS_SERVER(hdr->inode);
4496
4497         trace_nfs4_read(hdr, task->tk_status);
4498         if (nfs4_async_handle_error(task, server,
4499                                     hdr->args.context->state,
4500                                     NULL) == -EAGAIN) {
4501                 rpc_restart_call_prepare(task);
4502                 return -EAGAIN;
4503         }
4504
4505         __nfs4_read_done_cb(hdr);
4506         if (task->tk_status > 0)
4507                 renew_lease(server, hdr->timestamp);
4508         return 0;
4509 }
4510
4511 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4512                 struct nfs_pgio_args *args)
4513 {
4514
4515         if (!nfs4_error_stateid_expired(task->tk_status) ||
4516                 nfs4_stateid_is_current(&args->stateid,
4517                                 args->context,
4518                                 args->lock_context,
4519                                 FMODE_READ))
4520                 return false;
4521         rpc_restart_call_prepare(task);
4522         return true;
4523 }
4524
4525 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4526 {
4527
4528         dprintk("--> %s\n", __func__);
4529
4530         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4531                 return -EAGAIN;
4532         if (nfs4_read_stateid_changed(task, &hdr->args))
4533                 return -EAGAIN;
4534         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4535                                     nfs4_read_done_cb(task, hdr);
4536 }
4537
4538 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4539                                  struct rpc_message *msg)
4540 {
4541         hdr->timestamp   = jiffies;
4542         if (!hdr->pgio_done_cb)
4543                 hdr->pgio_done_cb = nfs4_read_done_cb;
4544         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4545         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4546 }
4547
4548 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4549                                       struct nfs_pgio_header *hdr)
4550 {
4551         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4552                         &hdr->args.seq_args,
4553                         &hdr->res.seq_res,
4554                         task))
4555                 return 0;
4556         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4557                                 hdr->args.lock_context,
4558                                 hdr->rw_ops->rw_mode) == -EIO)
4559                 return -EIO;
4560         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4561                 return -EIO;
4562         return 0;
4563 }
4564
4565 static int nfs4_write_done_cb(struct rpc_task *task,
4566                               struct nfs_pgio_header *hdr)
4567 {
4568         struct inode *inode = hdr->inode;
4569
4570         trace_nfs4_write(hdr, task->tk_status);
4571         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4572                                     hdr->args.context->state,
4573                                     NULL) == -EAGAIN) {
4574                 rpc_restart_call_prepare(task);
4575                 return -EAGAIN;
4576         }
4577         if (task->tk_status >= 0) {
4578                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4579                 nfs_writeback_update_inode(hdr);
4580         }
4581         return 0;
4582 }
4583
4584 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4585                 struct nfs_pgio_args *args)
4586 {
4587
4588         if (!nfs4_error_stateid_expired(task->tk_status) ||
4589                 nfs4_stateid_is_current(&args->stateid,
4590                                 args->context,
4591                                 args->lock_context,
4592                                 FMODE_WRITE))
4593                 return false;
4594         rpc_restart_call_prepare(task);
4595         return true;
4596 }
4597
4598 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4599 {
4600         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4601                 return -EAGAIN;
4602         if (nfs4_write_stateid_changed(task, &hdr->args))
4603                 return -EAGAIN;
4604         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4605                 nfs4_write_done_cb(task, hdr);
4606 }
4607
4608 static
4609 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4610 {
4611         /* Don't request attributes for pNFS or O_DIRECT writes */
4612         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4613                 return false;
4614         /* Otherwise, request attributes if and only if we don't hold
4615          * a delegation
4616          */
4617         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4618 }
4619
4620 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4621                                   struct rpc_message *msg)
4622 {
4623         struct nfs_server *server = NFS_SERVER(hdr->inode);
4624
4625         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4626                 hdr->args.bitmask = NULL;
4627                 hdr->res.fattr = NULL;
4628         } else
4629                 hdr->args.bitmask = server->cache_consistency_bitmask;
4630
4631         if (!hdr->pgio_done_cb)
4632                 hdr->pgio_done_cb = nfs4_write_done_cb;
4633         hdr->res.server = server;
4634         hdr->timestamp   = jiffies;
4635
4636         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4637         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4638 }
4639
4640 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4641 {
4642         nfs4_setup_sequence(NFS_SERVER(data->inode),
4643                         &data->args.seq_args,
4644                         &data->res.seq_res,
4645                         task);
4646 }
4647
4648 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4649 {
4650         struct inode *inode = data->inode;
4651
4652         trace_nfs4_commit(data, task->tk_status);
4653         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4654                                     NULL, NULL) == -EAGAIN) {
4655                 rpc_restart_call_prepare(task);
4656                 return -EAGAIN;
4657         }
4658         return 0;
4659 }
4660
4661 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4662 {
4663         if (!nfs4_sequence_done(task, &data->res.seq_res))
4664                 return -EAGAIN;
4665         return data->commit_done_cb(task, data);
4666 }
4667
4668 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4669 {
4670         struct nfs_server *server = NFS_SERVER(data->inode);
4671
4672         if (data->commit_done_cb == NULL)
4673                 data->commit_done_cb = nfs4_commit_done_cb;
4674         data->res.server = server;
4675         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4676         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4677 }
4678
4679 struct nfs4_renewdata {
4680         struct nfs_client       *client;
4681         unsigned long           timestamp;
4682 };
4683
4684 /*
4685  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4686  * standalone procedure for queueing an asynchronous RENEW.
4687  */
4688 static void nfs4_renew_release(void *calldata)
4689 {
4690         struct nfs4_renewdata *data = calldata;
4691         struct nfs_client *clp = data->client;
4692
4693         if (atomic_read(&clp->cl_count) > 1)
4694                 nfs4_schedule_state_renewal(clp);
4695         nfs_put_client(clp);
4696         kfree(data);
4697 }
4698
4699 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4700 {
4701         struct nfs4_renewdata *data = calldata;
4702         struct nfs_client *clp = data->client;
4703         unsigned long timestamp = data->timestamp;
4704
4705         trace_nfs4_renew_async(clp, task->tk_status);
4706         switch (task->tk_status) {
4707         case 0:
4708                 break;
4709         case -NFS4ERR_LEASE_MOVED:
4710                 nfs4_schedule_lease_moved_recovery(clp);
4711                 break;
4712         default:
4713                 /* Unless we're shutting down, schedule state recovery! */
4714                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4715                         return;
4716                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4717                         nfs4_schedule_lease_recovery(clp);
4718                         return;
4719                 }
4720                 nfs4_schedule_path_down_recovery(clp);
4721         }
4722         do_renew_lease(clp, timestamp);
4723 }
4724
4725 static const struct rpc_call_ops nfs4_renew_ops = {
4726         .rpc_call_done = nfs4_renew_done,
4727         .rpc_release = nfs4_renew_release,
4728 };
4729
4730 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4731 {
4732         struct rpc_message msg = {
4733                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4734                 .rpc_argp       = clp,
4735                 .rpc_cred       = cred,
4736         };
4737         struct nfs4_renewdata *data;
4738
4739         if (renew_flags == 0)
4740                 return 0;
4741         if (!atomic_inc_not_zero(&clp->cl_count))
4742                 return -EIO;
4743         data = kmalloc(sizeof(*data), GFP_NOFS);
4744         if (data == NULL)
4745                 return -ENOMEM;
4746         data->client = clp;
4747         data->timestamp = jiffies;
4748         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4749                         &nfs4_renew_ops, data);
4750 }
4751
4752 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4753 {
4754         struct rpc_message msg = {
4755                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4756                 .rpc_argp       = clp,
4757                 .rpc_cred       = cred,
4758         };
4759         unsigned long now = jiffies;
4760         int status;
4761
4762         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4763         if (status < 0)
4764                 return status;
4765         do_renew_lease(clp, now);
4766         return 0;
4767 }
4768
4769 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4770 {
4771         return server->caps & NFS_CAP_ACLS;
4772 }
4773
4774 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4775  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4776  * the stack.
4777  */
4778 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4779
4780 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4781                 struct page **pages)
4782 {
4783         struct page *newpage, **spages;
4784         int rc = 0;
4785         size_t len;
4786         spages = pages;
4787
4788         do {
4789                 len = min_t(size_t, PAGE_SIZE, buflen);
4790                 newpage = alloc_page(GFP_KERNEL);
4791
4792                 if (newpage == NULL)
4793                         goto unwind;
4794                 memcpy(page_address(newpage), buf, len);
4795                 buf += len;
4796                 buflen -= len;
4797                 *pages++ = newpage;
4798                 rc++;
4799         } while (buflen != 0);
4800
4801         return rc;
4802
4803 unwind:
4804         for(; rc > 0; rc--)
4805                 __free_page(spages[rc-1]);
4806         return -ENOMEM;
4807 }
4808
4809 struct nfs4_cached_acl {
4810         int cached;
4811         size_t len;
4812         char data[0];
4813 };
4814
4815 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4816 {
4817         struct nfs_inode *nfsi = NFS_I(inode);
4818
4819         spin_lock(&inode->i_lock);
4820         kfree(nfsi->nfs4_acl);
4821         nfsi->nfs4_acl = acl;
4822         spin_unlock(&inode->i_lock);
4823 }
4824
4825 static void nfs4_zap_acl_attr(struct inode *inode)
4826 {
4827         nfs4_set_cached_acl(inode, NULL);
4828 }
4829
4830 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4831 {
4832         struct nfs_inode *nfsi = NFS_I(inode);
4833         struct nfs4_cached_acl *acl;
4834         int ret = -ENOENT;
4835
4836         spin_lock(&inode->i_lock);
4837         acl = nfsi->nfs4_acl;
4838         if (acl == NULL)
4839                 goto out;
4840         if (buf == NULL) /* user is just asking for length */
4841                 goto out_len;
4842         if (acl->cached == 0)
4843                 goto out;
4844         ret = -ERANGE; /* see getxattr(2) man page */
4845         if (acl->len > buflen)
4846                 goto out;
4847         memcpy(buf, acl->data, acl->len);
4848 out_len:
4849         ret = acl->len;
4850 out:
4851         spin_unlock(&inode->i_lock);
4852         return ret;
4853 }
4854
4855 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4856 {
4857         struct nfs4_cached_acl *acl;
4858         size_t buflen = sizeof(*acl) + acl_len;
4859
4860         if (buflen <= PAGE_SIZE) {
4861                 acl = kmalloc(buflen, GFP_KERNEL);
4862                 if (acl == NULL)
4863                         goto out;
4864                 acl->cached = 1;
4865                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4866         } else {
4867                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4868                 if (acl == NULL)
4869                         goto out;
4870                 acl->cached = 0;
4871         }
4872         acl->len = acl_len;
4873 out:
4874         nfs4_set_cached_acl(inode, acl);
4875 }
4876
4877 /*
4878  * The getxattr API returns the required buffer length when called with a
4879  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4880  * the required buf.  On a NULL buf, we send a page of data to the server
4881  * guessing that the ACL request can be serviced by a page. If so, we cache
4882  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4883  * the cache. If not so, we throw away the page, and cache the required
4884  * length. The next getxattr call will then produce another round trip to
4885  * the server, this time with the input buf of the required size.
4886  */
4887 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4888 {
4889         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4890         struct nfs_getaclargs args = {
4891                 .fh = NFS_FH(inode),
4892                 .acl_pages = pages,
4893                 .acl_len = buflen,
4894         };
4895         struct nfs_getaclres res = {
4896                 .acl_len = buflen,
4897         };
4898         struct rpc_message msg = {
4899                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4900                 .rpc_argp = &args,
4901                 .rpc_resp = &res,
4902         };
4903         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4904         int ret = -ENOMEM, i;
4905
4906         /* As long as we're doing a round trip to the server anyway,
4907          * let's be prepared for a page of acl data. */
4908         if (npages == 0)
4909                 npages = 1;
4910         if (npages > ARRAY_SIZE(pages))
4911                 return -ERANGE;
4912
4913         for (i = 0; i < npages; i++) {
4914                 pages[i] = alloc_page(GFP_KERNEL);
4915                 if (!pages[i])
4916                         goto out_free;
4917         }
4918
4919         /* for decoding across pages */
4920         res.acl_scratch = alloc_page(GFP_KERNEL);
4921         if (!res.acl_scratch)
4922                 goto out_free;
4923
4924         args.acl_len = npages * PAGE_SIZE;
4925
4926         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4927                 __func__, buf, buflen, npages, args.acl_len);
4928         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4929                              &msg, &args.seq_args, &res.seq_res, 0);
4930         if (ret)
4931                 goto out_free;
4932
4933         /* Handle the case where the passed-in buffer is too short */
4934         if (res.acl_flags & NFS4_ACL_TRUNC) {
4935                 /* Did the user only issue a request for the acl length? */
4936                 if (buf == NULL)
4937                         goto out_ok;
4938                 ret = -ERANGE;
4939                 goto out_free;
4940         }
4941         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4942         if (buf) {
4943                 if (res.acl_len > buflen) {
4944                         ret = -ERANGE;
4945                         goto out_free;
4946                 }
4947                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4948         }
4949 out_ok:
4950         ret = res.acl_len;
4951 out_free:
4952         for (i = 0; i < npages; i++)
4953                 if (pages[i])
4954                         __free_page(pages[i]);
4955         if (res.acl_scratch)
4956                 __free_page(res.acl_scratch);
4957         return ret;
4958 }
4959
4960 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4961 {
4962         struct nfs4_exception exception = { };
4963         ssize_t ret;
4964         do {
4965                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4966                 trace_nfs4_get_acl(inode, ret);
4967                 if (ret >= 0)
4968                         break;
4969                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4970         } while (exception.retry);
4971         return ret;
4972 }
4973
4974 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4975 {
4976         struct nfs_server *server = NFS_SERVER(inode);
4977         int ret;
4978
4979         if (!nfs4_server_supports_acls(server))
4980                 return -EOPNOTSUPP;
4981         ret = nfs_revalidate_inode(server, inode);
4982         if (ret < 0)
4983                 return ret;
4984         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4985                 nfs_zap_acl_cache(inode);
4986         ret = nfs4_read_cached_acl(inode, buf, buflen);
4987         if (ret != -ENOENT)
4988                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4989                  * but no cached acl data, just the acl length */
4990                 return ret;
4991         return nfs4_get_acl_uncached(inode, buf, buflen);
4992 }
4993
4994 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4995 {
4996         struct nfs_server *server = NFS_SERVER(inode);
4997         struct page *pages[NFS4ACL_MAXPAGES];
4998         struct nfs_setaclargs arg = {
4999                 .fh             = NFS_FH(inode),
5000                 .acl_pages      = pages,
5001                 .acl_len        = buflen,
5002         };
5003         struct nfs_setaclres res;
5004         struct rpc_message msg = {
5005                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
5006                 .rpc_argp       = &arg,
5007                 .rpc_resp       = &res,
5008         };
5009         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
5010         int ret, i;
5011
5012         if (!nfs4_server_supports_acls(server))
5013                 return -EOPNOTSUPP;
5014         if (npages > ARRAY_SIZE(pages))
5015                 return -ERANGE;
5016         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
5017         if (i < 0)
5018                 return i;
5019         nfs4_inode_return_delegation(inode);
5020         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5021
5022         /*
5023          * Free each page after tx, so the only ref left is
5024          * held by the network stack
5025          */
5026         for (; i > 0; i--)
5027                 put_page(pages[i-1]);
5028
5029         /*
5030          * Acl update can result in inode attribute update.
5031          * so mark the attribute cache invalid.
5032          */
5033         spin_lock(&inode->i_lock);
5034         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
5035         spin_unlock(&inode->i_lock);
5036         nfs_access_zap_cache(inode);
5037         nfs_zap_acl_cache(inode);
5038         return ret;
5039 }
5040
5041 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
5042 {
5043         struct nfs4_exception exception = { };
5044         int err;
5045         do {
5046                 err = __nfs4_proc_set_acl(inode, buf, buflen);
5047                 trace_nfs4_set_acl(inode, err);
5048                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5049                                 &exception);
5050         } while (exception.retry);
5051         return err;
5052 }
5053
5054 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
5055 static int _nfs4_get_security_label(struct inode *inode, void *buf,
5056                                         size_t buflen)
5057 {
5058         struct nfs_server *server = NFS_SERVER(inode);
5059         struct nfs_fattr fattr;
5060         struct nfs4_label label = {0, 0, buflen, buf};
5061
5062         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5063         struct nfs4_getattr_arg arg = {
5064                 .fh             = NFS_FH(inode),
5065                 .bitmask        = bitmask,
5066         };
5067         struct nfs4_getattr_res res = {
5068                 .fattr          = &fattr,
5069                 .label          = &label,
5070                 .server         = server,
5071         };
5072         struct rpc_message msg = {
5073                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
5074                 .rpc_argp       = &arg,
5075                 .rpc_resp       = &res,
5076         };
5077         int ret;
5078
5079         nfs_fattr_init(&fattr);
5080
5081         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
5082         if (ret)
5083                 return ret;
5084         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
5085                 return -ENOENT;
5086         if (buflen < label.len)
5087                 return -ERANGE;
5088         return 0;
5089 }
5090
5091 static int nfs4_get_security_label(struct inode *inode, void *buf,
5092                                         size_t buflen)
5093 {
5094         struct nfs4_exception exception = { };
5095         int err;
5096
5097         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5098                 return -EOPNOTSUPP;
5099
5100         do {
5101                 err = _nfs4_get_security_label(inode, buf, buflen);
5102                 trace_nfs4_get_security_label(inode, err);
5103                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5104                                 &exception);
5105         } while (exception.retry);
5106         return err;
5107 }
5108
5109 static int _nfs4_do_set_security_label(struct inode *inode,
5110                 struct nfs4_label *ilabel,
5111                 struct nfs_fattr *fattr,
5112                 struct nfs4_label *olabel)
5113 {
5114
5115         struct iattr sattr = {0};
5116         struct nfs_server *server = NFS_SERVER(inode);
5117         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
5118         struct nfs_setattrargs arg = {
5119                 .fh             = NFS_FH(inode),
5120                 .iap            = &sattr,
5121                 .server         = server,
5122                 .bitmask        = bitmask,
5123                 .label          = ilabel,
5124         };
5125         struct nfs_setattrres res = {
5126                 .fattr          = fattr,
5127                 .label          = olabel,
5128                 .server         = server,
5129         };
5130         struct rpc_message msg = {
5131                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
5132                 .rpc_argp       = &arg,
5133                 .rpc_resp       = &res,
5134         };
5135         int status;
5136
5137         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
5138
5139         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5140         if (status)
5141                 dprintk("%s failed: %d\n", __func__, status);
5142
5143         return status;
5144 }
5145
5146 static int nfs4_do_set_security_label(struct inode *inode,
5147                 struct nfs4_label *ilabel,
5148                 struct nfs_fattr *fattr,
5149                 struct nfs4_label *olabel)
5150 {
5151         struct nfs4_exception exception = { };
5152         int err;
5153
5154         do {
5155                 err = _nfs4_do_set_security_label(inode, ilabel,
5156                                 fattr, olabel);
5157                 trace_nfs4_set_security_label(inode, err);
5158                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5159                                 &exception);
5160         } while (exception.retry);
5161         return err;
5162 }
5163
5164 static int
5165 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
5166 {
5167         struct nfs4_label ilabel, *olabel = NULL;
5168         struct nfs_fattr fattr;
5169         struct rpc_cred *cred;
5170         int status;
5171
5172         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5173                 return -EOPNOTSUPP;
5174
5175         nfs_fattr_init(&fattr);
5176
5177         ilabel.pi = 0;
5178         ilabel.lfs = 0;
5179         ilabel.label = (char *)buf;
5180         ilabel.len = buflen;
5181
5182         cred = rpc_lookup_cred();
5183         if (IS_ERR(cred))
5184                 return PTR_ERR(cred);
5185
5186         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5187         if (IS_ERR(olabel)) {
5188                 status = -PTR_ERR(olabel);
5189                 goto out;
5190         }
5191
5192         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5193         if (status == 0)
5194                 nfs_setsecurity(inode, &fattr, olabel);
5195
5196         nfs4_label_free(olabel);
5197 out:
5198         put_rpccred(cred);
5199         return status;
5200 }
5201 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
5202
5203
5204 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5205                                     nfs4_verifier *bootverf)
5206 {
5207         __be32 verf[2];
5208
5209         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5210                 /* An impossible timestamp guarantees this value
5211                  * will never match a generated boot time. */
5212                 verf[0] = 0;
5213                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
5214         } else {
5215                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5216                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
5217                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
5218         }
5219         memcpy(bootverf->data, verf, sizeof(bootverf->data));
5220 }
5221
5222 static int
5223 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
5224 {
5225         size_t len;
5226         char *str;
5227
5228         if (clp->cl_owner_id != NULL)
5229                 return 0;
5230
5231         rcu_read_lock();
5232         len = 14 + strlen(clp->cl_ipaddr) + 1 +
5233                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5234                 1 +
5235                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) +
5236                 1;
5237         rcu_read_unlock();
5238
5239         if (len > NFS4_OPAQUE_LIMIT + 1)
5240                 return -EINVAL;
5241
5242         /*
5243          * Since this string is allocated at mount time, and held until the
5244          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5245          * about a memory-reclaim deadlock.
5246          */
5247         str = kmalloc(len, GFP_KERNEL);
5248         if (!str)
5249                 return -ENOMEM;
5250
5251         rcu_read_lock();
5252         scnprintf(str, len, "Linux NFSv4.0 %s/%s %s",
5253                         clp->cl_ipaddr,
5254                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
5255                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO));
5256         rcu_read_unlock();
5257
5258         clp->cl_owner_id = str;
5259         return 0;
5260 }
5261
5262 static int
5263 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
5264 {
5265         size_t len;
5266         char *str;
5267
5268         len = 10 + 10 + 1 + 10 + 1 +
5269                 strlen(nfs4_client_id_uniquifier) + 1 +
5270                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5271
5272         if (len > NFS4_OPAQUE_LIMIT + 1)
5273                 return -EINVAL;
5274
5275         /*
5276          * Since this string is allocated at mount time, and held until the
5277          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5278          * about a memory-reclaim deadlock.
5279          */
5280         str = kmalloc(len, GFP_KERNEL);
5281         if (!str)
5282                 return -ENOMEM;
5283
5284         scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
5285                         clp->rpc_ops->version, clp->cl_minorversion,
5286                         nfs4_client_id_uniquifier,
5287                         clp->cl_rpcclient->cl_nodename);
5288         clp->cl_owner_id = str;
5289         return 0;
5290 }
5291
5292 static int
5293 nfs4_init_uniform_client_string(struct nfs_client *clp)
5294 {
5295         size_t len;
5296         char *str;
5297
5298         if (clp->cl_owner_id != NULL)
5299                 return 0;
5300
5301         if (nfs4_client_id_uniquifier[0] != '\0')
5302                 return nfs4_init_uniquifier_client_string(clp);
5303
5304         len = 10 + 10 + 1 + 10 + 1 +
5305                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5306
5307         if (len > NFS4_OPAQUE_LIMIT + 1)
5308                 return -EINVAL;
5309
5310         /*
5311          * Since this string is allocated at mount time, and held until the
5312          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5313          * about a memory-reclaim deadlock.
5314          */
5315         str = kmalloc(len, GFP_KERNEL);
5316         if (!str)
5317                 return -ENOMEM;
5318
5319         scnprintf(str, len, "Linux NFSv%u.%u %s",
5320                         clp->rpc_ops->version, clp->cl_minorversion,
5321                         clp->cl_rpcclient->cl_nodename);
5322         clp->cl_owner_id = str;
5323         return 0;
5324 }
5325
5326 /*
5327  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5328  * services.  Advertise one based on the address family of the
5329  * clientaddr.
5330  */
5331 static unsigned int
5332 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5333 {
5334         if (strchr(clp->cl_ipaddr, ':') != NULL)
5335                 return scnprintf(buf, len, "tcp6");
5336         else
5337                 return scnprintf(buf, len, "tcp");
5338 }
5339
5340 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5341 {
5342         struct nfs4_setclientid *sc = calldata;
5343
5344         if (task->tk_status == 0)
5345                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5346 }
5347
5348 static const struct rpc_call_ops nfs4_setclientid_ops = {
5349         .rpc_call_done = nfs4_setclientid_done,
5350 };
5351
5352 /**
5353  * nfs4_proc_setclientid - Negotiate client ID
5354  * @clp: state data structure
5355  * @program: RPC program for NFSv4 callback service
5356  * @port: IP port number for NFS4 callback service
5357  * @cred: RPC credential to use for this call
5358  * @res: where to place the result
5359  *
5360  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5361  */
5362 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5363                 unsigned short port, struct rpc_cred *cred,
5364                 struct nfs4_setclientid_res *res)
5365 {
5366         nfs4_verifier sc_verifier;
5367         struct nfs4_setclientid setclientid = {
5368                 .sc_verifier = &sc_verifier,
5369                 .sc_prog = program,
5370                 .sc_clnt = clp,
5371         };
5372         struct rpc_message msg = {
5373                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5374                 .rpc_argp = &setclientid,
5375                 .rpc_resp = res,
5376                 .rpc_cred = cred,
5377         };
5378         struct rpc_task *task;
5379         struct rpc_task_setup task_setup_data = {
5380                 .rpc_client = clp->cl_rpcclient,
5381                 .rpc_message = &msg,
5382                 .callback_ops = &nfs4_setclientid_ops,
5383                 .callback_data = &setclientid,
5384                 .flags = RPC_TASK_TIMEOUT,
5385         };
5386         int status;
5387
5388         /* nfs_client_id4 */
5389         nfs4_init_boot_verifier(clp, &sc_verifier);
5390
5391         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5392                 status = nfs4_init_uniform_client_string(clp);
5393         else
5394                 status = nfs4_init_nonuniform_client_string(clp);
5395
5396         if (status)
5397                 goto out;
5398
5399         /* cb_client4 */
5400         setclientid.sc_netid_len =
5401                                 nfs4_init_callback_netid(clp,
5402                                                 setclientid.sc_netid,
5403                                                 sizeof(setclientid.sc_netid));
5404         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5405                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5406                                 clp->cl_ipaddr, port >> 8, port & 255);
5407
5408         dprintk("NFS call  setclientid auth=%s, '%s'\n",
5409                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5410                 clp->cl_owner_id);
5411         task = rpc_run_task(&task_setup_data);
5412         if (IS_ERR(task)) {
5413                 status = PTR_ERR(task);
5414                 goto out;
5415         }
5416         status = task->tk_status;
5417         if (setclientid.sc_cred) {
5418                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5419                 put_rpccred(setclientid.sc_cred);
5420         }
5421         rpc_put_task(task);
5422 out:
5423         trace_nfs4_setclientid(clp, status);
5424         dprintk("NFS reply setclientid: %d\n", status);
5425         return status;
5426 }
5427
5428 /**
5429  * nfs4_proc_setclientid_confirm - Confirm client ID
5430  * @clp: state data structure
5431  * @res: result of a previous SETCLIENTID
5432  * @cred: RPC credential to use for this call
5433  *
5434  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5435  */
5436 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5437                 struct nfs4_setclientid_res *arg,
5438                 struct rpc_cred *cred)
5439 {
5440         struct rpc_message msg = {
5441                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5442                 .rpc_argp = arg,
5443                 .rpc_cred = cred,
5444         };
5445         int status;
5446
5447         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5448                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5449                 clp->cl_clientid);
5450         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5451         trace_nfs4_setclientid_confirm(clp, status);
5452         dprintk("NFS reply setclientid_confirm: %d\n", status);
5453         return status;
5454 }
5455
5456 struct nfs4_delegreturndata {
5457         struct nfs4_delegreturnargs args;
5458         struct nfs4_delegreturnres res;
5459         struct nfs_fh fh;
5460         nfs4_stateid stateid;
5461         unsigned long timestamp;
5462         struct nfs_fattr fattr;
5463         int rpc_status;
5464         struct inode *inode;
5465         bool roc;
5466         u32 roc_barrier;
5467 };
5468
5469 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5470 {
5471         struct nfs4_delegreturndata *data = calldata;
5472
5473         if (!nfs4_sequence_done(task, &data->res.seq_res))
5474                 return;
5475
5476         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5477         switch (task->tk_status) {
5478         case 0:
5479                 renew_lease(data->res.server, data->timestamp);
5480         case -NFS4ERR_ADMIN_REVOKED:
5481         case -NFS4ERR_DELEG_REVOKED:
5482         case -NFS4ERR_BAD_STATEID:
5483         case -NFS4ERR_OLD_STATEID:
5484         case -NFS4ERR_STALE_STATEID:
5485         case -NFS4ERR_EXPIRED:
5486                 task->tk_status = 0;
5487                 if (data->roc)
5488                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5489                 break;
5490         default:
5491                 if (nfs4_async_handle_error(task, data->res.server,
5492                                             NULL, NULL) == -EAGAIN) {
5493                         rpc_restart_call_prepare(task);
5494                         return;
5495                 }
5496         }
5497         data->rpc_status = task->tk_status;
5498 }
5499
5500 static void nfs4_delegreturn_release(void *calldata)
5501 {
5502         struct nfs4_delegreturndata *data = calldata;
5503         struct inode *inode = data->inode;
5504
5505         if (inode) {
5506                 if (data->roc)
5507                         pnfs_roc_release(inode);
5508                 nfs_iput_and_deactive(inode);
5509         }
5510         kfree(calldata);
5511 }
5512
5513 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5514 {
5515         struct nfs4_delegreturndata *d_data;
5516
5517         d_data = (struct nfs4_delegreturndata *)data;
5518
5519         if (nfs4_wait_on_layoutreturn(d_data->inode, task))
5520                 return;
5521
5522         if (d_data->roc)
5523                 pnfs_roc_get_barrier(d_data->inode, &d_data->roc_barrier);
5524
5525         nfs4_setup_sequence(d_data->res.server,
5526                         &d_data->args.seq_args,
5527                         &d_data->res.seq_res,
5528                         task);
5529 }
5530
5531 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5532         .rpc_call_prepare = nfs4_delegreturn_prepare,
5533         .rpc_call_done = nfs4_delegreturn_done,
5534         .rpc_release = nfs4_delegreturn_release,
5535 };
5536
5537 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5538 {
5539         struct nfs4_delegreturndata *data;
5540         struct nfs_server *server = NFS_SERVER(inode);
5541         struct rpc_task *task;
5542         struct rpc_message msg = {
5543                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5544                 .rpc_cred = cred,
5545         };
5546         struct rpc_task_setup task_setup_data = {
5547                 .rpc_client = server->client,
5548                 .rpc_message = &msg,
5549                 .callback_ops = &nfs4_delegreturn_ops,
5550                 .flags = RPC_TASK_ASYNC,
5551         };
5552         int status = 0;
5553
5554         data = kzalloc(sizeof(*data), GFP_NOFS);
5555         if (data == NULL)
5556                 return -ENOMEM;
5557         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5558
5559         nfs4_state_protect(server->nfs_client,
5560                         NFS_SP4_MACH_CRED_CLEANUP,
5561                         &task_setup_data.rpc_client, &msg);
5562
5563         data->args.fhandle = &data->fh;
5564         data->args.stateid = &data->stateid;
5565         data->args.bitmask = server->cache_consistency_bitmask;
5566         nfs_copy_fh(&data->fh, NFS_FH(inode));
5567         nfs4_stateid_copy(&data->stateid, stateid);
5568         data->res.fattr = &data->fattr;
5569         data->res.server = server;
5570         nfs_fattr_init(data->res.fattr);
5571         data->timestamp = jiffies;
5572         data->rpc_status = 0;
5573         data->inode = nfs_igrab_and_active(inode);
5574         if (data->inode)
5575                 data->roc = nfs4_roc(inode);
5576
5577         task_setup_data.callback_data = data;
5578         msg.rpc_argp = &data->args;
5579         msg.rpc_resp = &data->res;
5580         task = rpc_run_task(&task_setup_data);
5581         if (IS_ERR(task))
5582                 return PTR_ERR(task);
5583         if (!issync)
5584                 goto out;
5585         status = nfs4_wait_for_completion_rpc_task(task);
5586         if (status != 0)
5587                 goto out;
5588         status = data->rpc_status;
5589         if (status == 0)
5590                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5591         else
5592                 nfs_refresh_inode(inode, &data->fattr);
5593 out:
5594         rpc_put_task(task);
5595         return status;
5596 }
5597
5598 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5599 {
5600         struct nfs_server *server = NFS_SERVER(inode);
5601         struct nfs4_exception exception = { };
5602         int err;
5603         do {
5604                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5605                 trace_nfs4_delegreturn(inode, stateid, err);
5606                 switch (err) {
5607                         case -NFS4ERR_STALE_STATEID:
5608                         case -NFS4ERR_EXPIRED:
5609                         case 0:
5610                                 return 0;
5611                 }
5612                 err = nfs4_handle_exception(server, err, &exception);
5613         } while (exception.retry);
5614         return err;
5615 }
5616
5617 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5618 {
5619         struct inode *inode = state->inode;
5620         struct nfs_server *server = NFS_SERVER(inode);
5621         struct nfs_client *clp = server->nfs_client;
5622         struct nfs_lockt_args arg = {
5623                 .fh = NFS_FH(inode),
5624                 .fl = request,
5625         };
5626         struct nfs_lockt_res res = {
5627                 .denied = request,
5628         };
5629         struct rpc_message msg = {
5630                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5631                 .rpc_argp       = &arg,
5632                 .rpc_resp       = &res,
5633                 .rpc_cred       = state->owner->so_cred,
5634         };
5635         struct nfs4_lock_state *lsp;
5636         int status;
5637
5638         arg.lock_owner.clientid = clp->cl_clientid;
5639         status = nfs4_set_lock_state(state, request);
5640         if (status != 0)
5641                 goto out;
5642         lsp = request->fl_u.nfs4_fl.owner;
5643         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5644         arg.lock_owner.s_dev = server->s_dev;
5645         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5646         switch (status) {
5647                 case 0:
5648                         request->fl_type = F_UNLCK;
5649                         break;
5650                 case -NFS4ERR_DENIED:
5651                         status = 0;
5652         }
5653         request->fl_ops->fl_release_private(request);
5654         request->fl_ops = NULL;
5655 out:
5656         return status;
5657 }
5658
5659 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5660 {
5661         struct nfs4_exception exception = { };
5662         int err;
5663
5664         do {
5665                 err = _nfs4_proc_getlk(state, cmd, request);
5666                 trace_nfs4_get_lock(request, state, cmd, err);
5667                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5668                                 &exception);
5669         } while (exception.retry);
5670         return err;
5671 }
5672
5673 struct nfs4_unlockdata {
5674         struct nfs_locku_args arg;
5675         struct nfs_locku_res res;
5676         struct nfs4_lock_state *lsp;
5677         struct nfs_open_context *ctx;
5678         struct file_lock fl;
5679         struct nfs_server *server;
5680         unsigned long timestamp;
5681 };
5682
5683 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5684                 struct nfs_open_context *ctx,
5685                 struct nfs4_lock_state *lsp,
5686                 struct nfs_seqid *seqid)
5687 {
5688         struct nfs4_unlockdata *p;
5689         struct inode *inode = lsp->ls_state->inode;
5690
5691         p = kzalloc(sizeof(*p), GFP_NOFS);
5692         if (p == NULL)
5693                 return NULL;
5694         p->arg.fh = NFS_FH(inode);
5695         p->arg.fl = &p->fl;
5696         p->arg.seqid = seqid;
5697         p->res.seqid = seqid;
5698         p->lsp = lsp;
5699         atomic_inc(&lsp->ls_count);
5700         /* Ensure we don't close file until we're done freeing locks! */
5701         p->ctx = get_nfs_open_context(ctx);
5702         memcpy(&p->fl, fl, sizeof(p->fl));
5703         p->server = NFS_SERVER(inode);
5704         return p;
5705 }
5706
5707 static void nfs4_locku_release_calldata(void *data)
5708 {
5709         struct nfs4_unlockdata *calldata = data;
5710         nfs_free_seqid(calldata->arg.seqid);
5711         nfs4_put_lock_state(calldata->lsp);
5712         put_nfs_open_context(calldata->ctx);
5713         kfree(calldata);
5714 }
5715
5716 static void nfs4_locku_done(struct rpc_task *task, void *data)
5717 {
5718         struct nfs4_unlockdata *calldata = data;
5719
5720         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5721                 return;
5722         switch (task->tk_status) {
5723                 case 0:
5724                         renew_lease(calldata->server, calldata->timestamp);
5725                         locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
5726                         if (nfs4_update_lock_stateid(calldata->lsp,
5727                                         &calldata->res.stateid))
5728                                 break;
5729                 case -NFS4ERR_BAD_STATEID:
5730                 case -NFS4ERR_OLD_STATEID:
5731                 case -NFS4ERR_STALE_STATEID:
5732                 case -NFS4ERR_EXPIRED:
5733                         if (!nfs4_stateid_match(&calldata->arg.stateid,
5734                                                 &calldata->lsp->ls_stateid))
5735                                 rpc_restart_call_prepare(task);
5736                         break;
5737                 default:
5738                         if (nfs4_async_handle_error(task, calldata->server,
5739                                                     NULL, NULL) == -EAGAIN)
5740                                 rpc_restart_call_prepare(task);
5741         }
5742         nfs_release_seqid(calldata->arg.seqid);
5743 }
5744
5745 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5746 {
5747         struct nfs4_unlockdata *calldata = data;
5748
5749         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5750                 goto out_wait;
5751         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5752         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5753                 /* Note: exit _without_ running nfs4_locku_done */
5754                 goto out_no_action;
5755         }
5756         calldata->timestamp = jiffies;
5757         if (nfs4_setup_sequence(calldata->server,
5758                                 &calldata->arg.seq_args,
5759                                 &calldata->res.seq_res,
5760                                 task) != 0)
5761                 nfs_release_seqid(calldata->arg.seqid);
5762         return;
5763 out_no_action:
5764         task->tk_action = NULL;
5765 out_wait:
5766         nfs4_sequence_done(task, &calldata->res.seq_res);
5767 }
5768
5769 static const struct rpc_call_ops nfs4_locku_ops = {
5770         .rpc_call_prepare = nfs4_locku_prepare,
5771         .rpc_call_done = nfs4_locku_done,
5772         .rpc_release = nfs4_locku_release_calldata,
5773 };
5774
5775 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5776                 struct nfs_open_context *ctx,
5777                 struct nfs4_lock_state *lsp,
5778                 struct nfs_seqid *seqid)
5779 {
5780         struct nfs4_unlockdata *data;
5781         struct rpc_message msg = {
5782                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5783                 .rpc_cred = ctx->cred,
5784         };
5785         struct rpc_task_setup task_setup_data = {
5786                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5787                 .rpc_message = &msg,
5788                 .callback_ops = &nfs4_locku_ops,
5789                 .workqueue = nfsiod_workqueue,
5790                 .flags = RPC_TASK_ASYNC,
5791         };
5792
5793         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5794                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5795
5796         /* Ensure this is an unlock - when canceling a lock, the
5797          * canceled lock is passed in, and it won't be an unlock.
5798          */
5799         fl->fl_type = F_UNLCK;
5800
5801         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5802         if (data == NULL) {
5803                 nfs_free_seqid(seqid);
5804                 return ERR_PTR(-ENOMEM);
5805         }
5806
5807         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5808         msg.rpc_argp = &data->arg;
5809         msg.rpc_resp = &data->res;
5810         task_setup_data.callback_data = data;
5811         return rpc_run_task(&task_setup_data);
5812 }
5813
5814 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5815 {
5816         struct inode *inode = state->inode;
5817         struct nfs4_state_owner *sp = state->owner;
5818         struct nfs_inode *nfsi = NFS_I(inode);
5819         struct nfs_seqid *seqid;
5820         struct nfs4_lock_state *lsp;
5821         struct rpc_task *task;
5822         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5823         int status = 0;
5824         unsigned char fl_flags = request->fl_flags;
5825
5826         status = nfs4_set_lock_state(state, request);
5827         /* Unlock _before_ we do the RPC call */
5828         request->fl_flags |= FL_EXISTS;
5829         /* Exclude nfs_delegation_claim_locks() */
5830         mutex_lock(&sp->so_delegreturn_mutex);
5831         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5832         down_read(&nfsi->rwsem);
5833         if (locks_lock_inode_wait(inode, request) == -ENOENT) {
5834                 up_read(&nfsi->rwsem);
5835                 mutex_unlock(&sp->so_delegreturn_mutex);
5836                 goto out;
5837         }
5838         up_read(&nfsi->rwsem);
5839         mutex_unlock(&sp->so_delegreturn_mutex);
5840         if (status != 0)
5841                 goto out;
5842         /* Is this a delegated lock? */
5843         lsp = request->fl_u.nfs4_fl.owner;
5844         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5845                 goto out;
5846         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5847         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5848         status = -ENOMEM;
5849         if (IS_ERR(seqid))
5850                 goto out;
5851         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5852         status = PTR_ERR(task);
5853         if (IS_ERR(task))
5854                 goto out;
5855         status = nfs4_wait_for_completion_rpc_task(task);
5856         rpc_put_task(task);
5857 out:
5858         request->fl_flags = fl_flags;
5859         trace_nfs4_unlock(request, state, F_SETLK, status);
5860         return status;
5861 }
5862
5863 struct nfs4_lockdata {
5864         struct nfs_lock_args arg;
5865         struct nfs_lock_res res;
5866         struct nfs4_lock_state *lsp;
5867         struct nfs_open_context *ctx;
5868         struct file_lock fl;
5869         unsigned long timestamp;
5870         int rpc_status;
5871         int cancelled;
5872         struct nfs_server *server;
5873 };
5874
5875 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5876                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5877                 gfp_t gfp_mask)
5878 {
5879         struct nfs4_lockdata *p;
5880         struct inode *inode = lsp->ls_state->inode;
5881         struct nfs_server *server = NFS_SERVER(inode);
5882         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5883
5884         p = kzalloc(sizeof(*p), gfp_mask);
5885         if (p == NULL)
5886                 return NULL;
5887
5888         p->arg.fh = NFS_FH(inode);
5889         p->arg.fl = &p->fl;
5890         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5891         if (IS_ERR(p->arg.open_seqid))
5892                 goto out_free;
5893         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
5894         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5895         if (IS_ERR(p->arg.lock_seqid))
5896                 goto out_free_seqid;
5897         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5898         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5899         p->arg.lock_owner.s_dev = server->s_dev;
5900         p->res.lock_seqid = p->arg.lock_seqid;
5901         p->lsp = lsp;
5902         p->server = server;
5903         atomic_inc(&lsp->ls_count);
5904         p->ctx = get_nfs_open_context(ctx);
5905         get_file(fl->fl_file);
5906         memcpy(&p->fl, fl, sizeof(p->fl));
5907         return p;
5908 out_free_seqid:
5909         nfs_free_seqid(p->arg.open_seqid);
5910 out_free:
5911         kfree(p);
5912         return NULL;
5913 }
5914
5915 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5916 {
5917         struct nfs4_lockdata *data = calldata;
5918         struct nfs4_state *state = data->lsp->ls_state;
5919
5920         dprintk("%s: begin!\n", __func__);
5921         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5922                 goto out_wait;
5923         /* Do we need to do an open_to_lock_owner? */
5924         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5925                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5926                         goto out_release_lock_seqid;
5927                 }
5928                 nfs4_stateid_copy(&data->arg.open_stateid,
5929                                 &state->open_stateid);
5930                 data->arg.new_lock_owner = 1;
5931                 data->res.open_seqid = data->arg.open_seqid;
5932         } else {
5933                 data->arg.new_lock_owner = 0;
5934                 nfs4_stateid_copy(&data->arg.lock_stateid,
5935                                 &data->lsp->ls_stateid);
5936         }
5937         if (!nfs4_valid_open_stateid(state)) {
5938                 data->rpc_status = -EBADF;
5939                 task->tk_action = NULL;
5940                 goto out_release_open_seqid;
5941         }
5942         data->timestamp = jiffies;
5943         if (nfs4_setup_sequence(data->server,
5944                                 &data->arg.seq_args,
5945                                 &data->res.seq_res,
5946                                 task) == 0)
5947                 return;
5948 out_release_open_seqid:
5949         nfs_release_seqid(data->arg.open_seqid);
5950 out_release_lock_seqid:
5951         nfs_release_seqid(data->arg.lock_seqid);
5952 out_wait:
5953         nfs4_sequence_done(task, &data->res.seq_res);
5954         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5955 }
5956
5957 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5958 {
5959         struct nfs4_lockdata *data = calldata;
5960         struct nfs4_lock_state *lsp = data->lsp;
5961
5962         dprintk("%s: begin!\n", __func__);
5963
5964         if (!nfs4_sequence_done(task, &data->res.seq_res))
5965                 return;
5966
5967         data->rpc_status = task->tk_status;
5968         switch (task->tk_status) {
5969         case 0:
5970                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
5971                                 data->timestamp);
5972                 if (data->arg.new_lock) {
5973                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5974                         if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) {
5975                                 rpc_restart_call_prepare(task);
5976                                 break;
5977                         }
5978                 }
5979                 if (data->arg.new_lock_owner != 0) {
5980                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
5981                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5982                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5983                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5984                         rpc_restart_call_prepare(task);
5985                 break;
5986         case -NFS4ERR_BAD_STATEID:
5987         case -NFS4ERR_OLD_STATEID:
5988         case -NFS4ERR_STALE_STATEID:
5989         case -NFS4ERR_EXPIRED:
5990                 if (data->arg.new_lock_owner != 0) {
5991                         if (!nfs4_stateid_match(&data->arg.open_stateid,
5992                                                 &lsp->ls_state->open_stateid))
5993                                 rpc_restart_call_prepare(task);
5994                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5995                                                 &lsp->ls_stateid))
5996                                 rpc_restart_call_prepare(task);
5997         }
5998         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5999 }
6000
6001 static void nfs4_lock_release(void *calldata)
6002 {
6003         struct nfs4_lockdata *data = calldata;
6004
6005         dprintk("%s: begin!\n", __func__);
6006         nfs_free_seqid(data->arg.open_seqid);
6007         if (data->cancelled != 0) {
6008                 struct rpc_task *task;
6009                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
6010                                 data->arg.lock_seqid);
6011                 if (!IS_ERR(task))
6012                         rpc_put_task_async(task);
6013                 dprintk("%s: cancelling lock!\n", __func__);
6014         } else
6015                 nfs_free_seqid(data->arg.lock_seqid);
6016         nfs4_put_lock_state(data->lsp);
6017         put_nfs_open_context(data->ctx);
6018         fput(data->fl.fl_file);
6019         kfree(data);
6020         dprintk("%s: done!\n", __func__);
6021 }
6022
6023 static const struct rpc_call_ops nfs4_lock_ops = {
6024         .rpc_call_prepare = nfs4_lock_prepare,
6025         .rpc_call_done = nfs4_lock_done,
6026         .rpc_release = nfs4_lock_release,
6027 };
6028
6029 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
6030 {
6031         switch (error) {
6032         case -NFS4ERR_ADMIN_REVOKED:
6033         case -NFS4ERR_BAD_STATEID:
6034                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6035                 if (new_lock_owner != 0 ||
6036                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
6037                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
6038                 break;
6039         case -NFS4ERR_STALE_STATEID:
6040                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
6041         case -NFS4ERR_EXPIRED:
6042                 nfs4_schedule_lease_recovery(server->nfs_client);
6043         };
6044 }
6045
6046 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
6047 {
6048         struct nfs4_lockdata *data;
6049         struct rpc_task *task;
6050         struct rpc_message msg = {
6051                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
6052                 .rpc_cred = state->owner->so_cred,
6053         };
6054         struct rpc_task_setup task_setup_data = {
6055                 .rpc_client = NFS_CLIENT(state->inode),
6056                 .rpc_message = &msg,
6057                 .callback_ops = &nfs4_lock_ops,
6058                 .workqueue = nfsiod_workqueue,
6059                 .flags = RPC_TASK_ASYNC,
6060         };
6061         int ret;
6062
6063         dprintk("%s: begin!\n", __func__);
6064         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
6065                         fl->fl_u.nfs4_fl.owner,
6066                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
6067         if (data == NULL)
6068                 return -ENOMEM;
6069         if (IS_SETLKW(cmd))
6070                 data->arg.block = 1;
6071         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
6072         msg.rpc_argp = &data->arg;
6073         msg.rpc_resp = &data->res;
6074         task_setup_data.callback_data = data;
6075         if (recovery_type > NFS_LOCK_NEW) {
6076                 if (recovery_type == NFS_LOCK_RECLAIM)
6077                         data->arg.reclaim = NFS_LOCK_RECLAIM;
6078                 nfs4_set_sequence_privileged(&data->arg.seq_args);
6079         } else
6080                 data->arg.new_lock = 1;
6081         task = rpc_run_task(&task_setup_data);
6082         if (IS_ERR(task))
6083                 return PTR_ERR(task);
6084         ret = nfs4_wait_for_completion_rpc_task(task);
6085         if (ret == 0) {
6086                 ret = data->rpc_status;
6087                 if (ret)
6088                         nfs4_handle_setlk_error(data->server, data->lsp,
6089                                         data->arg.new_lock_owner, ret);
6090         } else
6091                 data->cancelled = 1;
6092         rpc_put_task(task);
6093         dprintk("%s: done, ret = %d!\n", __func__, ret);
6094         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
6095         return ret;
6096 }
6097
6098 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
6099 {
6100         struct nfs_server *server = NFS_SERVER(state->inode);
6101         struct nfs4_exception exception = {
6102                 .inode = state->inode,
6103         };
6104         int err;
6105
6106         do {
6107                 /* Cache the lock if possible... */
6108                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6109                         return 0;
6110                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
6111                 if (err != -NFS4ERR_DELAY)
6112                         break;
6113                 nfs4_handle_exception(server, err, &exception);
6114         } while (exception.retry);
6115         return err;
6116 }
6117
6118 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
6119 {
6120         struct nfs_server *server = NFS_SERVER(state->inode);
6121         struct nfs4_exception exception = {
6122                 .inode = state->inode,
6123         };
6124         int err;
6125
6126         err = nfs4_set_lock_state(state, request);
6127         if (err != 0)
6128                 return err;
6129         if (!recover_lost_locks) {
6130                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
6131                 return 0;
6132         }
6133         do {
6134                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6135                         return 0;
6136                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
6137                 switch (err) {
6138                 default:
6139                         goto out;
6140                 case -NFS4ERR_GRACE:
6141                 case -NFS4ERR_DELAY:
6142                         nfs4_handle_exception(server, err, &exception);
6143                         err = 0;
6144                 }
6145         } while (exception.retry);
6146 out:
6147         return err;
6148 }
6149
6150 #if defined(CONFIG_NFS_V4_1)
6151 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
6152 {
6153         struct nfs4_lock_state *lsp;
6154         int status;
6155
6156         status = nfs4_set_lock_state(state, request);
6157         if (status != 0)
6158                 return status;
6159         lsp = request->fl_u.nfs4_fl.owner;
6160         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
6161             test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
6162                 return 0;
6163         status = nfs4_lock_expired(state, request);
6164         return status;
6165 }
6166 #endif
6167
6168 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6169 {
6170         struct nfs_inode *nfsi = NFS_I(state->inode);
6171         struct nfs4_state_owner *sp = state->owner;
6172         unsigned char fl_flags = request->fl_flags;
6173         int status;
6174
6175         request->fl_flags |= FL_ACCESS;
6176         status = locks_lock_inode_wait(state->inode, request);
6177         if (status < 0)
6178                 goto out;
6179         mutex_lock(&sp->so_delegreturn_mutex);
6180         down_read(&nfsi->rwsem);
6181         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
6182                 /* Yes: cache locks! */
6183                 /* ...but avoid races with delegation recall... */
6184                 request->fl_flags = fl_flags & ~FL_SLEEP;
6185                 status = locks_lock_inode_wait(state->inode, request);
6186                 up_read(&nfsi->rwsem);
6187                 mutex_unlock(&sp->so_delegreturn_mutex);
6188                 goto out;
6189         }
6190         up_read(&nfsi->rwsem);
6191         mutex_unlock(&sp->so_delegreturn_mutex);
6192         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
6193 out:
6194         request->fl_flags = fl_flags;
6195         return status;
6196 }
6197
6198 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6199 {
6200         struct nfs4_exception exception = {
6201                 .state = state,
6202                 .inode = state->inode,
6203         };
6204         int err;
6205
6206         do {
6207                 err = _nfs4_proc_setlk(state, cmd, request);
6208                 if (err == -NFS4ERR_DENIED)
6209                         err = -EAGAIN;
6210                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
6211                                 err, &exception);
6212         } while (exception.retry);
6213         return err;
6214 }
6215
6216 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
6217 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
6218
6219 static int
6220 nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
6221                         struct file_lock *request)
6222 {
6223         int             status = -ERESTARTSYS;
6224         unsigned long   timeout = NFS4_LOCK_MINTIMEOUT;
6225
6226         while(!signalled()) {
6227                 status = nfs4_proc_setlk(state, cmd, request);
6228                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6229                         break;
6230                 freezable_schedule_timeout_interruptible(timeout);
6231                 timeout *= 2;
6232                 timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
6233                 status = -ERESTARTSYS;
6234         }
6235         return status;
6236 }
6237
6238 #ifdef CONFIG_NFS_V4_1
6239 struct nfs4_lock_waiter {
6240         struct task_struct      *task;
6241         struct inode            *inode;
6242         struct nfs_lowner       *owner;
6243         bool                    notified;
6244 };
6245
6246 static int
6247 nfs4_wake_lock_waiter(wait_queue_t *wait, unsigned int mode, int flags, void *key)
6248 {
6249         int ret;
6250         struct cb_notify_lock_args *cbnl = key;
6251         struct nfs4_lock_waiter *waiter = wait->private;
6252         struct nfs_lowner       *lowner = &cbnl->cbnl_owner,
6253                                 *wowner = waiter->owner;
6254
6255         /* Only wake if the callback was for the same owner */
6256         if (lowner->clientid != wowner->clientid ||
6257             lowner->id != wowner->id             ||
6258             lowner->s_dev != wowner->s_dev)
6259                 return 0;
6260
6261         /* Make sure it's for the right inode */
6262         if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
6263                 return 0;
6264
6265         waiter->notified = true;
6266
6267         /* override "private" so we can use default_wake_function */
6268         wait->private = waiter->task;
6269         ret = autoremove_wake_function(wait, mode, flags, key);
6270         wait->private = waiter;
6271         return ret;
6272 }
6273
6274 static int
6275 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6276 {
6277         int status = -ERESTARTSYS;
6278         unsigned long flags;
6279         struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
6280         struct nfs_server *server = NFS_SERVER(state->inode);
6281         struct nfs_client *clp = server->nfs_client;
6282         wait_queue_head_t *q = &clp->cl_lock_waitq;
6283         struct nfs_lowner owner = { .clientid = clp->cl_clientid,
6284                                     .id = lsp->ls_seqid.owner_id,
6285                                     .s_dev = server->s_dev };
6286         struct nfs4_lock_waiter waiter = { .task  = current,
6287                                            .inode = state->inode,
6288                                            .owner = &owner,
6289                                            .notified = false };
6290         wait_queue_t wait;
6291
6292         /* Don't bother with waitqueue if we don't expect a callback */
6293         if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
6294                 return nfs4_retry_setlk_simple(state, cmd, request);
6295
6296         init_wait(&wait);
6297         wait.private = &waiter;
6298         wait.func = nfs4_wake_lock_waiter;
6299         add_wait_queue(q, &wait);
6300
6301         while(!signalled()) {
6302                 status = nfs4_proc_setlk(state, cmd, request);
6303                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6304                         break;
6305
6306                 status = -ERESTARTSYS;
6307                 spin_lock_irqsave(&q->lock, flags);
6308                 if (waiter.notified) {
6309                         spin_unlock_irqrestore(&q->lock, flags);
6310                         continue;
6311                 }
6312                 set_current_state(TASK_INTERRUPTIBLE);
6313                 spin_unlock_irqrestore(&q->lock, flags);
6314
6315                 freezable_schedule_timeout_interruptible(NFS4_LOCK_MAXTIMEOUT);
6316         }
6317
6318         finish_wait(q, &wait);
6319         return status;
6320 }
6321 #else /* !CONFIG_NFS_V4_1 */
6322 static inline int
6323 nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6324 {
6325         return nfs4_retry_setlk_simple(state, cmd, request);
6326 }
6327 #endif
6328
6329 static int
6330 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
6331 {
6332         struct nfs_open_context *ctx;
6333         struct nfs4_state *state;
6334         int status;
6335
6336         /* verify open state */
6337         ctx = nfs_file_open_context(filp);
6338         state = ctx->state;
6339
6340         if (request->fl_start < 0 || request->fl_end < 0)
6341                 return -EINVAL;
6342
6343         if (IS_GETLK(cmd)) {
6344                 if (state != NULL)
6345                         return nfs4_proc_getlk(state, F_GETLK, request);
6346                 return 0;
6347         }
6348
6349         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
6350                 return -EINVAL;
6351
6352         if (request->fl_type == F_UNLCK) {
6353                 if (state != NULL)
6354                         return nfs4_proc_unlck(state, cmd, request);
6355                 return 0;
6356         }
6357
6358         if (state == NULL)
6359                 return -ENOLCK;
6360
6361         if ((request->fl_flags & FL_POSIX) &&
6362             !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
6363                 return -ENOLCK;
6364
6365         /*
6366          * Don't rely on the VFS having checked the file open mode,
6367          * since it won't do this for flock() locks.
6368          */
6369         switch (request->fl_type) {
6370         case F_RDLCK:
6371                 if (!(filp->f_mode & FMODE_READ))
6372                         return -EBADF;
6373                 break;
6374         case F_WRLCK:
6375                 if (!(filp->f_mode & FMODE_WRITE))
6376                         return -EBADF;
6377         }
6378
6379         status = nfs4_set_lock_state(state, request);
6380         if (status != 0)
6381                 return status;
6382
6383         return nfs4_retry_setlk(state, cmd, request);
6384 }
6385
6386 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6387 {
6388         struct nfs_server *server = NFS_SERVER(state->inode);
6389         int err;
6390
6391         err = nfs4_set_lock_state(state, fl);
6392         if (err != 0)
6393                 return err;
6394         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6395         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6396 }
6397
6398 struct nfs_release_lockowner_data {
6399         struct nfs4_lock_state *lsp;
6400         struct nfs_server *server;
6401         struct nfs_release_lockowner_args args;
6402         struct nfs_release_lockowner_res res;
6403         unsigned long timestamp;
6404 };
6405
6406 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6407 {
6408         struct nfs_release_lockowner_data *data = calldata;
6409         struct nfs_server *server = data->server;
6410         nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6411                              &data->args.seq_args, &data->res.seq_res, task);
6412         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6413         data->timestamp = jiffies;
6414 }
6415
6416 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6417 {
6418         struct nfs_release_lockowner_data *data = calldata;
6419         struct nfs_server *server = data->server;
6420
6421         nfs40_sequence_done(task, &data->res.seq_res);
6422
6423         switch (task->tk_status) {
6424         case 0:
6425                 renew_lease(server, data->timestamp);
6426                 break;
6427         case -NFS4ERR_STALE_CLIENTID:
6428         case -NFS4ERR_EXPIRED:
6429                 nfs4_schedule_lease_recovery(server->nfs_client);
6430                 break;
6431         case -NFS4ERR_LEASE_MOVED:
6432         case -NFS4ERR_DELAY:
6433                 if (nfs4_async_handle_error(task, server,
6434                                             NULL, NULL) == -EAGAIN)
6435                         rpc_restart_call_prepare(task);
6436         }
6437 }
6438
6439 static void nfs4_release_lockowner_release(void *calldata)
6440 {
6441         struct nfs_release_lockowner_data *data = calldata;
6442         nfs4_free_lock_state(data->server, data->lsp);
6443         kfree(calldata);
6444 }
6445
6446 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6447         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6448         .rpc_call_done = nfs4_release_lockowner_done,
6449         .rpc_release = nfs4_release_lockowner_release,
6450 };
6451
6452 static void
6453 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6454 {
6455         struct nfs_release_lockowner_data *data;
6456         struct rpc_message msg = {
6457                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6458         };
6459
6460         if (server->nfs_client->cl_mvops->minor_version != 0)
6461                 return;
6462
6463         data = kmalloc(sizeof(*data), GFP_NOFS);
6464         if (!data)
6465                 return;
6466         data->lsp = lsp;
6467         data->server = server;
6468         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6469         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6470         data->args.lock_owner.s_dev = server->s_dev;
6471
6472         msg.rpc_argp = &data->args;
6473         msg.rpc_resp = &data->res;
6474         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6475         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6476 }
6477
6478 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6479
6480 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
6481                                    struct dentry *unused, struct inode *inode,
6482                                    const char *key, const void *buf,
6483                                    size_t buflen, int flags)
6484 {
6485         return nfs4_proc_set_acl(inode, buf, buflen);
6486 }
6487
6488 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
6489                                    struct dentry *unused, struct inode *inode,
6490                                    const char *key, void *buf, size_t buflen)
6491 {
6492         return nfs4_proc_get_acl(inode, buf, buflen);
6493 }
6494
6495 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
6496 {
6497         return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
6498 }
6499
6500 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6501
6502 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
6503                                      struct dentry *unused, struct inode *inode,
6504                                      const char *key, const void *buf,
6505                                      size_t buflen, int flags)
6506 {
6507         if (security_ismaclabel(key))
6508                 return nfs4_set_security_label(inode, buf, buflen);
6509
6510         return -EOPNOTSUPP;
6511 }
6512
6513 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
6514                                      struct dentry *unused, struct inode *inode,
6515                                      const char *key, void *buf, size_t buflen)
6516 {
6517         if (security_ismaclabel(key))
6518                 return nfs4_get_security_label(inode, buf, buflen);
6519         return -EOPNOTSUPP;
6520 }
6521
6522 static ssize_t
6523 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6524 {
6525         int len = 0;
6526
6527         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
6528                 len = security_inode_listsecurity(inode, list, list_len);
6529                 if (list_len && len > list_len)
6530                         return -ERANGE;
6531         }
6532         return len;
6533 }
6534
6535 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6536         .prefix = XATTR_SECURITY_PREFIX,
6537         .get    = nfs4_xattr_get_nfs4_label,
6538         .set    = nfs4_xattr_set_nfs4_label,
6539 };
6540
6541 #else
6542
6543 static ssize_t
6544 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6545 {
6546         return 0;
6547 }
6548
6549 #endif
6550
6551 /*
6552  * nfs_fhget will use either the mounted_on_fileid or the fileid
6553  */
6554 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6555 {
6556         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6557                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6558               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6559               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6560                 return;
6561
6562         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6563                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6564         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6565         fattr->nlink = 2;
6566 }
6567
6568 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6569                                    const struct qstr *name,
6570                                    struct nfs4_fs_locations *fs_locations,
6571                                    struct page *page)
6572 {
6573         struct nfs_server *server = NFS_SERVER(dir);
6574         u32 bitmask[3] = {
6575                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6576         };
6577         struct nfs4_fs_locations_arg args = {
6578                 .dir_fh = NFS_FH(dir),
6579                 .name = name,
6580                 .page = page,
6581                 .bitmask = bitmask,
6582         };
6583         struct nfs4_fs_locations_res res = {
6584                 .fs_locations = fs_locations,
6585         };
6586         struct rpc_message msg = {
6587                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6588                 .rpc_argp = &args,
6589                 .rpc_resp = &res,
6590         };
6591         int status;
6592
6593         dprintk("%s: start\n", __func__);
6594
6595         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6596          * is not supported */
6597         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6598                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6599         else
6600                 bitmask[0] |= FATTR4_WORD0_FILEID;
6601
6602         nfs_fattr_init(&fs_locations->fattr);
6603         fs_locations->server = server;
6604         fs_locations->nlocations = 0;
6605         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6606         dprintk("%s: returned status = %d\n", __func__, status);
6607         return status;
6608 }
6609
6610 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6611                            const struct qstr *name,
6612                            struct nfs4_fs_locations *fs_locations,
6613                            struct page *page)
6614 {
6615         struct nfs4_exception exception = { };
6616         int err;
6617         do {
6618                 err = _nfs4_proc_fs_locations(client, dir, name,
6619                                 fs_locations, page);
6620                 trace_nfs4_get_fs_locations(dir, name, err);
6621                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6622                                 &exception);
6623         } while (exception.retry);
6624         return err;
6625 }
6626
6627 /*
6628  * This operation also signals the server that this client is
6629  * performing migration recovery.  The server can stop returning
6630  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6631  * appended to this compound to identify the client ID which is
6632  * performing recovery.
6633  */
6634 static int _nfs40_proc_get_locations(struct inode *inode,
6635                                      struct nfs4_fs_locations *locations,
6636                                      struct page *page, struct rpc_cred *cred)
6637 {
6638         struct nfs_server *server = NFS_SERVER(inode);
6639         struct rpc_clnt *clnt = server->client;
6640         u32 bitmask[2] = {
6641                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6642         };
6643         struct nfs4_fs_locations_arg args = {
6644                 .clientid       = server->nfs_client->cl_clientid,
6645                 .fh             = NFS_FH(inode),
6646                 .page           = page,
6647                 .bitmask        = bitmask,
6648                 .migration      = 1,            /* skip LOOKUP */
6649                 .renew          = 1,            /* append RENEW */
6650         };
6651         struct nfs4_fs_locations_res res = {
6652                 .fs_locations   = locations,
6653                 .migration      = 1,
6654                 .renew          = 1,
6655         };
6656         struct rpc_message msg = {
6657                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6658                 .rpc_argp       = &args,
6659                 .rpc_resp       = &res,
6660                 .rpc_cred       = cred,
6661         };
6662         unsigned long now = jiffies;
6663         int status;
6664
6665         nfs_fattr_init(&locations->fattr);
6666         locations->server = server;
6667         locations->nlocations = 0;
6668
6669         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6670         nfs4_set_sequence_privileged(&args.seq_args);
6671         status = nfs4_call_sync_sequence(clnt, server, &msg,
6672                                         &args.seq_args, &res.seq_res);
6673         if (status)
6674                 return status;
6675
6676         renew_lease(server, now);
6677         return 0;
6678 }
6679
6680 #ifdef CONFIG_NFS_V4_1
6681
6682 /*
6683  * This operation also signals the server that this client is
6684  * performing migration recovery.  The server can stop asserting
6685  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6686  * performing this operation is identified in the SEQUENCE
6687  * operation in this compound.
6688  *
6689  * When the client supports GETATTR(fs_locations_info), it can
6690  * be plumbed in here.
6691  */
6692 static int _nfs41_proc_get_locations(struct inode *inode,
6693                                      struct nfs4_fs_locations *locations,
6694                                      struct page *page, struct rpc_cred *cred)
6695 {
6696         struct nfs_server *server = NFS_SERVER(inode);
6697         struct rpc_clnt *clnt = server->client;
6698         u32 bitmask[2] = {
6699                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6700         };
6701         struct nfs4_fs_locations_arg args = {
6702                 .fh             = NFS_FH(inode),
6703                 .page           = page,
6704                 .bitmask        = bitmask,
6705                 .migration      = 1,            /* skip LOOKUP */
6706         };
6707         struct nfs4_fs_locations_res res = {
6708                 .fs_locations   = locations,
6709                 .migration      = 1,
6710         };
6711         struct rpc_message msg = {
6712                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6713                 .rpc_argp       = &args,
6714                 .rpc_resp       = &res,
6715                 .rpc_cred       = cred,
6716         };
6717         int status;
6718
6719         nfs_fattr_init(&locations->fattr);
6720         locations->server = server;
6721         locations->nlocations = 0;
6722
6723         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6724         nfs4_set_sequence_privileged(&args.seq_args);
6725         status = nfs4_call_sync_sequence(clnt, server, &msg,
6726                                         &args.seq_args, &res.seq_res);
6727         if (status == NFS4_OK &&
6728             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6729                 status = -NFS4ERR_LEASE_MOVED;
6730         return status;
6731 }
6732
6733 #endif  /* CONFIG_NFS_V4_1 */
6734
6735 /**
6736  * nfs4_proc_get_locations - discover locations for a migrated FSID
6737  * @inode: inode on FSID that is migrating
6738  * @locations: result of query
6739  * @page: buffer
6740  * @cred: credential to use for this operation
6741  *
6742  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6743  * operation failed, or a negative errno if a local error occurred.
6744  *
6745  * On success, "locations" is filled in, but if the server has
6746  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6747  * asserted.
6748  *
6749  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6750  * from this client that require migration recovery.
6751  */
6752 int nfs4_proc_get_locations(struct inode *inode,
6753                             struct nfs4_fs_locations *locations,
6754                             struct page *page, struct rpc_cred *cred)
6755 {
6756         struct nfs_server *server = NFS_SERVER(inode);
6757         struct nfs_client *clp = server->nfs_client;
6758         const struct nfs4_mig_recovery_ops *ops =
6759                                         clp->cl_mvops->mig_recovery_ops;
6760         struct nfs4_exception exception = { };
6761         int status;
6762
6763         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6764                 (unsigned long long)server->fsid.major,
6765                 (unsigned long long)server->fsid.minor,
6766                 clp->cl_hostname);
6767         nfs_display_fhandle(NFS_FH(inode), __func__);
6768
6769         do {
6770                 status = ops->get_locations(inode, locations, page, cred);
6771                 if (status != -NFS4ERR_DELAY)
6772                         break;
6773                 nfs4_handle_exception(server, status, &exception);
6774         } while (exception.retry);
6775         return status;
6776 }
6777
6778 /*
6779  * This operation also signals the server that this client is
6780  * performing "lease moved" recovery.  The server can stop
6781  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6782  * is appended to this compound to identify the client ID which is
6783  * performing recovery.
6784  */
6785 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6786 {
6787         struct nfs_server *server = NFS_SERVER(inode);
6788         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6789         struct rpc_clnt *clnt = server->client;
6790         struct nfs4_fsid_present_arg args = {
6791                 .fh             = NFS_FH(inode),
6792                 .clientid       = clp->cl_clientid,
6793                 .renew          = 1,            /* append RENEW */
6794         };
6795         struct nfs4_fsid_present_res res = {
6796                 .renew          = 1,
6797         };
6798         struct rpc_message msg = {
6799                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6800                 .rpc_argp       = &args,
6801                 .rpc_resp       = &res,
6802                 .rpc_cred       = cred,
6803         };
6804         unsigned long now = jiffies;
6805         int status;
6806
6807         res.fh = nfs_alloc_fhandle();
6808         if (res.fh == NULL)
6809                 return -ENOMEM;
6810
6811         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6812         nfs4_set_sequence_privileged(&args.seq_args);
6813         status = nfs4_call_sync_sequence(clnt, server, &msg,
6814                                                 &args.seq_args, &res.seq_res);
6815         nfs_free_fhandle(res.fh);
6816         if (status)
6817                 return status;
6818
6819         do_renew_lease(clp, now);
6820         return 0;
6821 }
6822
6823 #ifdef CONFIG_NFS_V4_1
6824
6825 /*
6826  * This operation also signals the server that this client is
6827  * performing "lease moved" recovery.  The server can stop asserting
6828  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6829  * this operation is identified in the SEQUENCE operation in this
6830  * compound.
6831  */
6832 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6833 {
6834         struct nfs_server *server = NFS_SERVER(inode);
6835         struct rpc_clnt *clnt = server->client;
6836         struct nfs4_fsid_present_arg args = {
6837                 .fh             = NFS_FH(inode),
6838         };
6839         struct nfs4_fsid_present_res res = {
6840         };
6841         struct rpc_message msg = {
6842                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6843                 .rpc_argp       = &args,
6844                 .rpc_resp       = &res,
6845                 .rpc_cred       = cred,
6846         };
6847         int status;
6848
6849         res.fh = nfs_alloc_fhandle();
6850         if (res.fh == NULL)
6851                 return -ENOMEM;
6852
6853         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6854         nfs4_set_sequence_privileged(&args.seq_args);
6855         status = nfs4_call_sync_sequence(clnt, server, &msg,
6856                                                 &args.seq_args, &res.seq_res);
6857         nfs_free_fhandle(res.fh);
6858         if (status == NFS4_OK &&
6859             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6860                 status = -NFS4ERR_LEASE_MOVED;
6861         return status;
6862 }
6863
6864 #endif  /* CONFIG_NFS_V4_1 */
6865
6866 /**
6867  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6868  * @inode: inode on FSID to check
6869  * @cred: credential to use for this operation
6870  *
6871  * Server indicates whether the FSID is present, moved, or not
6872  * recognized.  This operation is necessary to clear a LEASE_MOVED
6873  * condition for this client ID.
6874  *
6875  * Returns NFS4_OK if the FSID is present on this server,
6876  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6877  *  NFS4ERR code if some error occurred on the server, or a
6878  *  negative errno if a local failure occurred.
6879  */
6880 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6881 {
6882         struct nfs_server *server = NFS_SERVER(inode);
6883         struct nfs_client *clp = server->nfs_client;
6884         const struct nfs4_mig_recovery_ops *ops =
6885                                         clp->cl_mvops->mig_recovery_ops;
6886         struct nfs4_exception exception = { };
6887         int status;
6888
6889         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6890                 (unsigned long long)server->fsid.major,
6891                 (unsigned long long)server->fsid.minor,
6892                 clp->cl_hostname);
6893         nfs_display_fhandle(NFS_FH(inode), __func__);
6894
6895         do {
6896                 status = ops->fsid_present(inode, cred);
6897                 if (status != -NFS4ERR_DELAY)
6898                         break;
6899                 nfs4_handle_exception(server, status, &exception);
6900         } while (exception.retry);
6901         return status;
6902 }
6903
6904 /**
6905  * If 'use_integrity' is true and the state managment nfs_client
6906  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6907  * and the machine credential as per RFC3530bis and RFC5661 Security
6908  * Considerations sections. Otherwise, just use the user cred with the
6909  * filesystem's rpc_client.
6910  */
6911 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6912 {
6913         int status;
6914         struct nfs4_secinfo_arg args = {
6915                 .dir_fh = NFS_FH(dir),
6916                 .name   = name,
6917         };
6918         struct nfs4_secinfo_res res = {
6919                 .flavors     = flavors,
6920         };
6921         struct rpc_message msg = {
6922                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6923                 .rpc_argp = &args,
6924                 .rpc_resp = &res,
6925         };
6926         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6927         struct rpc_cred *cred = NULL;
6928
6929         if (use_integrity) {
6930                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6931                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6932                 msg.rpc_cred = cred;
6933         }
6934
6935         dprintk("NFS call  secinfo %s\n", name->name);
6936
6937         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6938                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6939
6940         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6941                                 &res.seq_res, 0);
6942         dprintk("NFS reply  secinfo: %d\n", status);
6943
6944         if (cred)
6945                 put_rpccred(cred);
6946
6947         return status;
6948 }
6949
6950 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6951                       struct nfs4_secinfo_flavors *flavors)
6952 {
6953         struct nfs4_exception exception = { };
6954         int err;
6955         do {
6956                 err = -NFS4ERR_WRONGSEC;
6957
6958                 /* try to use integrity protection with machine cred */
6959                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6960                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6961
6962                 /*
6963                  * if unable to use integrity protection, or SECINFO with
6964                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6965                  * disallowed by spec, but exists in deployed servers) use
6966                  * the current filesystem's rpc_client and the user cred.
6967                  */
6968                 if (err == -NFS4ERR_WRONGSEC)
6969                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6970
6971                 trace_nfs4_secinfo(dir, name, err);
6972                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6973                                 &exception);
6974         } while (exception.retry);
6975         return err;
6976 }
6977
6978 #ifdef CONFIG_NFS_V4_1
6979 /*
6980  * Check the exchange flags returned by the server for invalid flags, having
6981  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6982  * DS flags set.
6983  */
6984 static int nfs4_check_cl_exchange_flags(u32 flags)
6985 {
6986         if (flags & ~EXCHGID4_FLAG_MASK_R)
6987                 goto out_inval;
6988         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6989             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6990                 goto out_inval;
6991         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6992                 goto out_inval;
6993         return NFS_OK;
6994 out_inval:
6995         return -NFS4ERR_INVAL;
6996 }
6997
6998 static bool
6999 nfs41_same_server_scope(struct nfs41_server_scope *a,
7000                         struct nfs41_server_scope *b)
7001 {
7002         if (a->server_scope_sz == b->server_scope_sz &&
7003             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
7004                 return true;
7005
7006         return false;
7007 }
7008
7009 static void
7010 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
7011 {
7012 }
7013
7014 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
7015         .rpc_call_done =  &nfs4_bind_one_conn_to_session_done,
7016 };
7017
7018 /*
7019  * nfs4_proc_bind_one_conn_to_session()
7020  *
7021  * The 4.1 client currently uses the same TCP connection for the
7022  * fore and backchannel.
7023  */
7024 static
7025 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
7026                 struct rpc_xprt *xprt,
7027                 struct nfs_client *clp,
7028                 struct rpc_cred *cred)
7029 {
7030         int status;
7031         struct nfs41_bind_conn_to_session_args args = {
7032                 .client = clp,
7033                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
7034         };
7035         struct nfs41_bind_conn_to_session_res res;
7036         struct rpc_message msg = {
7037                 .rpc_proc =
7038                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
7039                 .rpc_argp = &args,
7040                 .rpc_resp = &res,
7041                 .rpc_cred = cred,
7042         };
7043         struct rpc_task_setup task_setup_data = {
7044                 .rpc_client = clnt,
7045                 .rpc_xprt = xprt,
7046                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
7047                 .rpc_message = &msg,
7048                 .flags = RPC_TASK_TIMEOUT,
7049         };
7050         struct rpc_task *task;
7051
7052         dprintk("--> %s\n", __func__);
7053
7054         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
7055         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
7056                 args.dir = NFS4_CDFC4_FORE;
7057
7058         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
7059         if (xprt != rcu_access_pointer(clnt->cl_xprt))
7060                 args.dir = NFS4_CDFC4_FORE;
7061
7062         task = rpc_run_task(&task_setup_data);
7063         if (!IS_ERR(task)) {
7064                 status = task->tk_status;
7065                 rpc_put_task(task);
7066         } else
7067                 status = PTR_ERR(task);
7068         trace_nfs4_bind_conn_to_session(clp, status);
7069         if (status == 0) {
7070                 if (memcmp(res.sessionid.data,
7071                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
7072                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
7073                         status = -EIO;
7074                         goto out;
7075                 }
7076                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
7077                         dprintk("NFS: %s: Unexpected direction from server\n",
7078                                 __func__);
7079                         status = -EIO;
7080                         goto out;
7081                 }
7082                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
7083                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
7084                                 __func__);
7085                         status = -EIO;
7086                         goto out;
7087                 }
7088         }
7089 out:
7090         dprintk("<-- %s status= %d\n", __func__, status);
7091         return status;
7092 }
7093
7094 struct rpc_bind_conn_calldata {
7095         struct nfs_client *clp;
7096         struct rpc_cred *cred;
7097 };
7098
7099 static int
7100 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
7101                 struct rpc_xprt *xprt,
7102                 void *calldata)
7103 {
7104         struct rpc_bind_conn_calldata *p = calldata;
7105
7106         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
7107 }
7108
7109 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
7110 {
7111         struct rpc_bind_conn_calldata data = {
7112                 .clp = clp,
7113                 .cred = cred,
7114         };
7115         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
7116                         nfs4_proc_bind_conn_to_session_callback, &data);
7117 }
7118
7119 /*
7120  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
7121  * and operations we'd like to see to enable certain features in the allow map
7122  */
7123 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
7124         .how = SP4_MACH_CRED,
7125         .enforce.u.words = {
7126                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
7127                       1 << (OP_EXCHANGE_ID - 32) |
7128                       1 << (OP_CREATE_SESSION - 32) |
7129                       1 << (OP_DESTROY_SESSION - 32) |
7130                       1 << (OP_DESTROY_CLIENTID - 32)
7131         },
7132         .allow.u.words = {
7133                 [0] = 1 << (OP_CLOSE) |
7134                       1 << (OP_OPEN_DOWNGRADE) |
7135                       1 << (OP_LOCKU) |
7136                       1 << (OP_DELEGRETURN) |
7137                       1 << (OP_COMMIT),
7138                 [1] = 1 << (OP_SECINFO - 32) |
7139                       1 << (OP_SECINFO_NO_NAME - 32) |
7140                       1 << (OP_LAYOUTRETURN - 32) |
7141                       1 << (OP_TEST_STATEID - 32) |
7142                       1 << (OP_FREE_STATEID - 32) |
7143                       1 << (OP_WRITE - 32)
7144         }
7145 };
7146
7147 /*
7148  * Select the state protection mode for client `clp' given the server results
7149  * from exchange_id in `sp'.
7150  *
7151  * Returns 0 on success, negative errno otherwise.
7152  */
7153 static int nfs4_sp4_select_mode(struct nfs_client *clp,
7154                                  struct nfs41_state_protection *sp)
7155 {
7156         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
7157                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
7158                       1 << (OP_EXCHANGE_ID - 32) |
7159                       1 << (OP_CREATE_SESSION - 32) |
7160                       1 << (OP_DESTROY_SESSION - 32) |
7161                       1 << (OP_DESTROY_CLIENTID - 32)
7162         };
7163         unsigned int i;
7164
7165         if (sp->how == SP4_MACH_CRED) {
7166                 /* Print state protect result */
7167                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
7168                 for (i = 0; i <= LAST_NFS4_OP; i++) {
7169                         if (test_bit(i, sp->enforce.u.longs))
7170                                 dfprintk(MOUNT, "  enforce op %d\n", i);
7171                         if (test_bit(i, sp->allow.u.longs))
7172                                 dfprintk(MOUNT, "  allow op %d\n", i);
7173                 }
7174
7175                 /* make sure nothing is on enforce list that isn't supported */
7176                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
7177                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
7178                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7179                                 return -EINVAL;
7180                         }
7181                 }
7182
7183                 /*
7184                  * Minimal mode - state operations are allowed to use machine
7185                  * credential.  Note this already happens by default, so the
7186                  * client doesn't have to do anything more than the negotiation.
7187                  *
7188                  * NOTE: we don't care if EXCHANGE_ID is in the list -
7189                  *       we're already using the machine cred for exchange_id
7190                  *       and will never use a different cred.
7191                  */
7192                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
7193                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
7194                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
7195                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
7196                         dfprintk(MOUNT, "sp4_mach_cred:\n");
7197                         dfprintk(MOUNT, "  minimal mode enabled\n");
7198                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
7199                 } else {
7200                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7201                         return -EINVAL;
7202                 }
7203
7204                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
7205                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
7206                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
7207                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
7208                         dfprintk(MOUNT, "  cleanup mode enabled\n");
7209                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
7210                 }
7211
7212                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
7213                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
7214                         set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP,
7215                                 &clp->cl_sp4_flags);
7216                 }
7217
7218                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
7219                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
7220                         dfprintk(MOUNT, "  secinfo mode enabled\n");
7221                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
7222                 }
7223
7224                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
7225                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
7226                         dfprintk(MOUNT, "  stateid mode enabled\n");
7227                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
7228                 }
7229
7230                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
7231                         dfprintk(MOUNT, "  write mode enabled\n");
7232                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
7233                 }
7234
7235                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
7236                         dfprintk(MOUNT, "  commit mode enabled\n");
7237                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
7238                 }
7239         }
7240
7241         return 0;
7242 }
7243
7244 struct nfs41_exchange_id_data {
7245         struct nfs41_exchange_id_res res;
7246         struct nfs41_exchange_id_args args;
7247         struct rpc_xprt *xprt;
7248         int rpc_status;
7249 };
7250
7251 static void nfs4_exchange_id_done(struct rpc_task *task, void *data)
7252 {
7253         struct nfs41_exchange_id_data *cdata =
7254                                         (struct nfs41_exchange_id_data *)data;
7255         struct nfs_client *clp = cdata->args.client;
7256         int status = task->tk_status;
7257
7258         trace_nfs4_exchange_id(clp, status);
7259
7260         if (status == 0)
7261                 status = nfs4_check_cl_exchange_flags(cdata->res.flags);
7262
7263         if (cdata->xprt && status == 0) {
7264                 status = nfs4_detect_session_trunking(clp, &cdata->res,
7265                                                       cdata->xprt);
7266                 goto out;
7267         }
7268
7269         if (status  == 0)
7270                 status = nfs4_sp4_select_mode(clp, &cdata->res.state_protect);
7271
7272         if (status == 0) {
7273                 clp->cl_clientid = cdata->res.clientid;
7274                 clp->cl_exchange_flags = cdata->res.flags;
7275                 /* Client ID is not confirmed */
7276                 if (!(cdata->res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
7277                         clear_bit(NFS4_SESSION_ESTABLISHED,
7278                         &clp->cl_session->session_state);
7279                         clp->cl_seqid = cdata->res.seqid;
7280                 }
7281
7282                 kfree(clp->cl_serverowner);
7283                 clp->cl_serverowner = cdata->res.server_owner;
7284                 cdata->res.server_owner = NULL;
7285
7286                 /* use the most recent implementation id */
7287                 kfree(clp->cl_implid);
7288                 clp->cl_implid = cdata->res.impl_id;
7289                 cdata->res.impl_id = NULL;
7290
7291                 if (clp->cl_serverscope != NULL &&
7292                     !nfs41_same_server_scope(clp->cl_serverscope,
7293                                         cdata->res.server_scope)) {
7294                         dprintk("%s: server_scope mismatch detected\n",
7295                                 __func__);
7296                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
7297                         kfree(clp->cl_serverscope);
7298                         clp->cl_serverscope = NULL;
7299                 }
7300
7301                 if (clp->cl_serverscope == NULL) {
7302                         clp->cl_serverscope = cdata->res.server_scope;
7303                         cdata->res.server_scope = NULL;
7304                 }
7305                 /* Save the EXCHANGE_ID verifier session trunk tests */
7306                 memcpy(clp->cl_confirm.data, cdata->args.verifier->data,
7307                        sizeof(clp->cl_confirm.data));
7308         }
7309 out:
7310         cdata->rpc_status = status;
7311         return;
7312 }
7313
7314 static void nfs4_exchange_id_release(void *data)
7315 {
7316         struct nfs41_exchange_id_data *cdata =
7317                                         (struct nfs41_exchange_id_data *)data;
7318
7319         nfs_put_client(cdata->args.client);
7320         if (cdata->xprt) {
7321                 xprt_put(cdata->xprt);
7322                 rpc_clnt_xprt_switch_put(cdata->args.client->cl_rpcclient);
7323         }
7324         kfree(cdata->res.impl_id);
7325         kfree(cdata->res.server_scope);
7326         kfree(cdata->res.server_owner);
7327         kfree(cdata);
7328 }
7329
7330 static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
7331         .rpc_call_done = nfs4_exchange_id_done,
7332         .rpc_release = nfs4_exchange_id_release,
7333 };
7334
7335 /*
7336  * _nfs4_proc_exchange_id()
7337  *
7338  * Wrapper for EXCHANGE_ID operation.
7339  */
7340 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
7341                         u32 sp4_how, struct rpc_xprt *xprt)
7342 {
7343         nfs4_verifier verifier;
7344         struct rpc_message msg = {
7345                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
7346                 .rpc_cred = cred,
7347         };
7348         struct rpc_task_setup task_setup_data = {
7349                 .rpc_client = clp->cl_rpcclient,
7350                 .callback_ops = &nfs4_exchange_id_call_ops,
7351                 .rpc_message = &msg,
7352                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7353         };
7354         struct nfs41_exchange_id_data *calldata;
7355         struct rpc_task *task;
7356         int status = -EIO;
7357
7358         if (!atomic_inc_not_zero(&clp->cl_count))
7359                 goto out;
7360
7361         status = -ENOMEM;
7362         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7363         if (!calldata)
7364                 goto out;
7365
7366         if (!xprt)
7367                 nfs4_init_boot_verifier(clp, &verifier);
7368
7369         status = nfs4_init_uniform_client_string(clp);
7370         if (status)
7371                 goto out_calldata;
7372
7373         dprintk("NFS call  exchange_id auth=%s, '%s'\n",
7374                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
7375                 clp->cl_owner_id);
7376
7377         calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
7378                                                 GFP_NOFS);
7379         status = -ENOMEM;
7380         if (unlikely(calldata->res.server_owner == NULL))
7381                 goto out_calldata;
7382
7383         calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
7384                                         GFP_NOFS);
7385         if (unlikely(calldata->res.server_scope == NULL))
7386                 goto out_server_owner;
7387
7388         calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
7389         if (unlikely(calldata->res.impl_id == NULL))
7390                 goto out_server_scope;
7391
7392         switch (sp4_how) {
7393         case SP4_NONE:
7394                 calldata->args.state_protect.how = SP4_NONE;
7395                 break;
7396
7397         case SP4_MACH_CRED:
7398                 calldata->args.state_protect = nfs4_sp4_mach_cred_request;
7399                 break;
7400
7401         default:
7402                 /* unsupported! */
7403                 WARN_ON_ONCE(1);
7404                 status = -EINVAL;
7405                 goto out_impl_id;
7406         }
7407         if (xprt) {
7408                 calldata->xprt = xprt;
7409                 task_setup_data.rpc_xprt = xprt;
7410                 task_setup_data.flags =
7411                                 RPC_TASK_SOFT|RPC_TASK_SOFTCONN|RPC_TASK_ASYNC;
7412                 calldata->args.verifier = &clp->cl_confirm;
7413         } else {
7414                 calldata->args.verifier = &verifier;
7415         }
7416         calldata->args.client = clp;
7417 #ifdef CONFIG_NFS_V4_1_MIGRATION
7418         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
7419         EXCHGID4_FLAG_BIND_PRINC_STATEID |
7420         EXCHGID4_FLAG_SUPP_MOVED_MIGR,
7421 #else
7422         calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
7423         EXCHGID4_FLAG_BIND_PRINC_STATEID,
7424 #endif
7425         msg.rpc_argp = &calldata->args;
7426         msg.rpc_resp = &calldata->res;
7427         task_setup_data.callback_data = calldata;
7428
7429         task = rpc_run_task(&task_setup_data);
7430         if (IS_ERR(task)) {
7431         status = PTR_ERR(task);
7432                 goto out_impl_id;
7433         }
7434
7435         if (!xprt) {
7436                 status = rpc_wait_for_completion_task(task);
7437                 if (!status)
7438                         status = calldata->rpc_status;
7439         } else  /* session trunking test */
7440                 status = calldata->rpc_status;
7441
7442         rpc_put_task(task);
7443 out:
7444         if (clp->cl_implid != NULL)
7445                 dprintk("NFS reply exchange_id: Server Implementation ID: "
7446                         "domain: %s, name: %s, date: %llu,%u\n",
7447                         clp->cl_implid->domain, clp->cl_implid->name,
7448                         clp->cl_implid->date.seconds,
7449                         clp->cl_implid->date.nseconds);
7450         dprintk("NFS reply exchange_id: %d\n", status);
7451         return status;
7452
7453 out_impl_id:
7454         kfree(calldata->res.impl_id);
7455 out_server_scope:
7456         kfree(calldata->res.server_scope);
7457 out_server_owner:
7458         kfree(calldata->res.server_owner);
7459 out_calldata:
7460         kfree(calldata);
7461         goto out;
7462 }
7463
7464 /*
7465  * nfs4_proc_exchange_id()
7466  *
7467  * Returns zero, a negative errno, or a negative NFS4ERR status code.
7468  *
7469  * Since the clientid has expired, all compounds using sessions
7470  * associated with the stale clientid will be returning
7471  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
7472  * be in some phase of session reset.
7473  *
7474  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
7475  */
7476 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
7477 {
7478         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
7479         int status;
7480
7481         /* try SP4_MACH_CRED if krb5i/p */
7482         if (authflavor == RPC_AUTH_GSS_KRB5I ||
7483             authflavor == RPC_AUTH_GSS_KRB5P) {
7484                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED, NULL);
7485                 if (!status)
7486                         return 0;
7487         }
7488
7489         /* try SP4_NONE */
7490         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE, NULL);
7491 }
7492
7493 /**
7494  * nfs4_test_session_trunk
7495  *
7496  * This is an add_xprt_test() test function called from
7497  * rpc_clnt_setup_test_and_add_xprt.
7498  *
7499  * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
7500  * and is dereferrenced in nfs4_exchange_id_release
7501  *
7502  * Upon success, add the new transport to the rpc_clnt
7503  *
7504  * @clnt: struct rpc_clnt to get new transport
7505  * @xprt: the rpc_xprt to test
7506  * @data: call data for _nfs4_proc_exchange_id.
7507  */
7508 int nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
7509                             void *data)
7510 {
7511         struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data;
7512         u32 sp4_how;
7513
7514         dprintk("--> %s try %s\n", __func__,
7515                 xprt->address_strings[RPC_DISPLAY_ADDR]);
7516
7517         sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
7518
7519         /* Test connection for session trunking. Async exchange_id call */
7520         return  _nfs4_proc_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
7521 }
7522 EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
7523
7524 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
7525                 struct rpc_cred *cred)
7526 {
7527         struct rpc_message msg = {
7528                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
7529                 .rpc_argp = clp,
7530                 .rpc_cred = cred,
7531         };
7532         int status;
7533
7534         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7535         trace_nfs4_destroy_clientid(clp, status);
7536         if (status)
7537                 dprintk("NFS: Got error %d from the server %s on "
7538                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
7539         return status;
7540 }
7541
7542 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
7543                 struct rpc_cred *cred)
7544 {
7545         unsigned int loop;
7546         int ret;
7547
7548         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
7549                 ret = _nfs4_proc_destroy_clientid(clp, cred);
7550                 switch (ret) {
7551                 case -NFS4ERR_DELAY:
7552                 case -NFS4ERR_CLIENTID_BUSY:
7553                         ssleep(1);
7554                         break;
7555                 default:
7556                         return ret;
7557                 }
7558         }
7559         return 0;
7560 }
7561
7562 int nfs4_destroy_clientid(struct nfs_client *clp)
7563 {
7564         struct rpc_cred *cred;
7565         int ret = 0;
7566
7567         if (clp->cl_mvops->minor_version < 1)
7568                 goto out;
7569         if (clp->cl_exchange_flags == 0)
7570                 goto out;
7571         if (clp->cl_preserve_clid)
7572                 goto out;
7573         cred = nfs4_get_clid_cred(clp);
7574         ret = nfs4_proc_destroy_clientid(clp, cred);
7575         if (cred)
7576                 put_rpccred(cred);
7577         switch (ret) {
7578         case 0:
7579         case -NFS4ERR_STALE_CLIENTID:
7580                 clp->cl_exchange_flags = 0;
7581         }
7582 out:
7583         return ret;
7584 }
7585
7586 struct nfs4_get_lease_time_data {
7587         struct nfs4_get_lease_time_args *args;
7588         struct nfs4_get_lease_time_res *res;
7589         struct nfs_client *clp;
7590 };
7591
7592 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7593                                         void *calldata)
7594 {
7595         struct nfs4_get_lease_time_data *data =
7596                         (struct nfs4_get_lease_time_data *)calldata;
7597
7598         dprintk("--> %s\n", __func__);
7599         /* just setup sequence, do not trigger session recovery
7600            since we're invoked within one */
7601         nfs41_setup_sequence(data->clp->cl_session,
7602                         &data->args->la_seq_args,
7603                         &data->res->lr_seq_res,
7604                         task);
7605         dprintk("<-- %s\n", __func__);
7606 }
7607
7608 /*
7609  * Called from nfs4_state_manager thread for session setup, so don't recover
7610  * from sequence operation or clientid errors.
7611  */
7612 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7613 {
7614         struct nfs4_get_lease_time_data *data =
7615                         (struct nfs4_get_lease_time_data *)calldata;
7616
7617         dprintk("--> %s\n", __func__);
7618         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7619                 return;
7620         switch (task->tk_status) {
7621         case -NFS4ERR_DELAY:
7622         case -NFS4ERR_GRACE:
7623                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7624                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7625                 task->tk_status = 0;
7626                 /* fall through */
7627         case -NFS4ERR_RETRY_UNCACHED_REP:
7628                 rpc_restart_call_prepare(task);
7629                 return;
7630         }
7631         dprintk("<-- %s\n", __func__);
7632 }
7633
7634 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7635         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7636         .rpc_call_done = nfs4_get_lease_time_done,
7637 };
7638
7639 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7640 {
7641         struct rpc_task *task;
7642         struct nfs4_get_lease_time_args args;
7643         struct nfs4_get_lease_time_res res = {
7644                 .lr_fsinfo = fsinfo,
7645         };
7646         struct nfs4_get_lease_time_data data = {
7647                 .args = &args,
7648                 .res = &res,
7649                 .clp = clp,
7650         };
7651         struct rpc_message msg = {
7652                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7653                 .rpc_argp = &args,
7654                 .rpc_resp = &res,
7655         };
7656         struct rpc_task_setup task_setup = {
7657                 .rpc_client = clp->cl_rpcclient,
7658                 .rpc_message = &msg,
7659                 .callback_ops = &nfs4_get_lease_time_ops,
7660                 .callback_data = &data,
7661                 .flags = RPC_TASK_TIMEOUT,
7662         };
7663         int status;
7664
7665         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7666         nfs4_set_sequence_privileged(&args.la_seq_args);
7667         dprintk("--> %s\n", __func__);
7668         task = rpc_run_task(&task_setup);
7669
7670         if (IS_ERR(task))
7671                 status = PTR_ERR(task);
7672         else {
7673                 status = task->tk_status;
7674                 rpc_put_task(task);
7675         }
7676         dprintk("<-- %s return %d\n", __func__, status);
7677
7678         return status;
7679 }
7680
7681 /*
7682  * Initialize the values to be used by the client in CREATE_SESSION
7683  * If nfs4_init_session set the fore channel request and response sizes,
7684  * use them.
7685  *
7686  * Set the back channel max_resp_sz_cached to zero to force the client to
7687  * always set csa_cachethis to FALSE because the current implementation
7688  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7689  */
7690 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
7691                                     struct rpc_clnt *clnt)
7692 {
7693         unsigned int max_rqst_sz, max_resp_sz;
7694         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
7695
7696         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7697         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7698
7699         /* Fore channel attributes */
7700         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7701         args->fc_attrs.max_resp_sz = max_resp_sz;
7702         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7703         args->fc_attrs.max_reqs = max_session_slots;
7704
7705         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7706                 "max_ops=%u max_reqs=%u\n",
7707                 __func__,
7708                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7709                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7710
7711         /* Back channel attributes */
7712         args->bc_attrs.max_rqst_sz = max_bc_payload;
7713         args->bc_attrs.max_resp_sz = max_bc_payload;
7714         args->bc_attrs.max_resp_sz_cached = 0;
7715         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7716         args->bc_attrs.max_reqs = min_t(unsigned short, max_session_cb_slots, 1);
7717
7718         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7719                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7720                 __func__,
7721                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7722                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7723                 args->bc_attrs.max_reqs);
7724 }
7725
7726 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
7727                 struct nfs41_create_session_res *res)
7728 {
7729         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7730         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
7731
7732         if (rcvd->max_resp_sz > sent->max_resp_sz)
7733                 return -EINVAL;
7734         /*
7735          * Our requested max_ops is the minimum we need; we're not
7736          * prepared to break up compounds into smaller pieces than that.
7737          * So, no point even trying to continue if the server won't
7738          * cooperate:
7739          */
7740         if (rcvd->max_ops < sent->max_ops)
7741                 return -EINVAL;
7742         if (rcvd->max_reqs == 0)
7743                 return -EINVAL;
7744         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7745                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7746         return 0;
7747 }
7748
7749 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
7750                 struct nfs41_create_session_res *res)
7751 {
7752         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7753         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
7754
7755         if (!(res->flags & SESSION4_BACK_CHAN))
7756                 goto out;
7757         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7758                 return -EINVAL;
7759         if (rcvd->max_resp_sz < sent->max_resp_sz)
7760                 return -EINVAL;
7761         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7762                 return -EINVAL;
7763         if (rcvd->max_ops > sent->max_ops)
7764                 return -EINVAL;
7765         if (rcvd->max_reqs > sent->max_reqs)
7766                 return -EINVAL;
7767 out:
7768         return 0;
7769 }
7770
7771 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7772                                      struct nfs41_create_session_res *res)
7773 {
7774         int ret;
7775
7776         ret = nfs4_verify_fore_channel_attrs(args, res);
7777         if (ret)
7778                 return ret;
7779         return nfs4_verify_back_channel_attrs(args, res);
7780 }
7781
7782 static void nfs4_update_session(struct nfs4_session *session,
7783                 struct nfs41_create_session_res *res)
7784 {
7785         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
7786         /* Mark client id and session as being confirmed */
7787         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
7788         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
7789         session->flags = res->flags;
7790         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
7791         if (res->flags & SESSION4_BACK_CHAN)
7792                 memcpy(&session->bc_attrs, &res->bc_attrs,
7793                                 sizeof(session->bc_attrs));
7794 }
7795
7796 static int _nfs4_proc_create_session(struct nfs_client *clp,
7797                 struct rpc_cred *cred)
7798 {
7799         struct nfs4_session *session = clp->cl_session;
7800         struct nfs41_create_session_args args = {
7801                 .client = clp,
7802                 .clientid = clp->cl_clientid,
7803                 .seqid = clp->cl_seqid,
7804                 .cb_program = NFS4_CALLBACK,
7805         };
7806         struct nfs41_create_session_res res;
7807
7808         struct rpc_message msg = {
7809                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7810                 .rpc_argp = &args,
7811                 .rpc_resp = &res,
7812                 .rpc_cred = cred,
7813         };
7814         int status;
7815
7816         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
7817         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7818
7819         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7820         trace_nfs4_create_session(clp, status);
7821
7822         switch (status) {
7823         case -NFS4ERR_STALE_CLIENTID:
7824         case -NFS4ERR_DELAY:
7825         case -ETIMEDOUT:
7826         case -EACCES:
7827         case -EAGAIN:
7828                 goto out;
7829         };
7830
7831         clp->cl_seqid++;
7832         if (!status) {
7833                 /* Verify the session's negotiated channel_attrs values */
7834                 status = nfs4_verify_channel_attrs(&args, &res);
7835                 /* Increment the clientid slot sequence id */
7836                 if (status)
7837                         goto out;
7838                 nfs4_update_session(session, &res);
7839         }
7840 out:
7841         return status;
7842 }
7843
7844 /*
7845  * Issues a CREATE_SESSION operation to the server.
7846  * It is the responsibility of the caller to verify the session is
7847  * expired before calling this routine.
7848  */
7849 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7850 {
7851         int status;
7852         unsigned *ptr;
7853         struct nfs4_session *session = clp->cl_session;
7854
7855         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7856
7857         status = _nfs4_proc_create_session(clp, cred);
7858         if (status)
7859                 goto out;
7860
7861         /* Init or reset the session slot tables */
7862         status = nfs4_setup_session_slot_tables(session);
7863         dprintk("slot table setup returned %d\n", status);
7864         if (status)
7865                 goto out;
7866
7867         ptr = (unsigned *)&session->sess_id.data[0];
7868         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7869                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7870 out:
7871         dprintk("<-- %s\n", __func__);
7872         return status;
7873 }
7874
7875 /*
7876  * Issue the over-the-wire RPC DESTROY_SESSION.
7877  * The caller must serialize access to this routine.
7878  */
7879 int nfs4_proc_destroy_session(struct nfs4_session *session,
7880                 struct rpc_cred *cred)
7881 {
7882         struct rpc_message msg = {
7883                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7884                 .rpc_argp = session,
7885                 .rpc_cred = cred,
7886         };
7887         int status = 0;
7888
7889         dprintk("--> nfs4_proc_destroy_session\n");
7890
7891         /* session is still being setup */
7892         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
7893                 return 0;
7894
7895         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7896         trace_nfs4_destroy_session(session->clp, status);
7897
7898         if (status)
7899                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7900                         "Session has been destroyed regardless...\n", status);
7901
7902         dprintk("<-- nfs4_proc_destroy_session\n");
7903         return status;
7904 }
7905
7906 /*
7907  * Renew the cl_session lease.
7908  */
7909 struct nfs4_sequence_data {
7910         struct nfs_client *clp;
7911         struct nfs4_sequence_args args;
7912         struct nfs4_sequence_res res;
7913 };
7914
7915 static void nfs41_sequence_release(void *data)
7916 {
7917         struct nfs4_sequence_data *calldata = data;
7918         struct nfs_client *clp = calldata->clp;
7919
7920         if (atomic_read(&clp->cl_count) > 1)
7921                 nfs4_schedule_state_renewal(clp);
7922         nfs_put_client(clp);
7923         kfree(calldata);
7924 }
7925
7926 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7927 {
7928         switch(task->tk_status) {
7929         case -NFS4ERR_DELAY:
7930                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7931                 return -EAGAIN;
7932         default:
7933                 nfs4_schedule_lease_recovery(clp);
7934         }
7935         return 0;
7936 }
7937
7938 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7939 {
7940         struct nfs4_sequence_data *calldata = data;
7941         struct nfs_client *clp = calldata->clp;
7942
7943         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7944                 return;
7945
7946         trace_nfs4_sequence(clp, task->tk_status);
7947         if (task->tk_status < 0) {
7948                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7949                 if (atomic_read(&clp->cl_count) == 1)
7950                         goto out;
7951
7952                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7953                         rpc_restart_call_prepare(task);
7954                         return;
7955                 }
7956         }
7957         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7958 out:
7959         dprintk("<-- %s\n", __func__);
7960 }
7961
7962 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7963 {
7964         struct nfs4_sequence_data *calldata = data;
7965         struct nfs_client *clp = calldata->clp;
7966         struct nfs4_sequence_args *args;
7967         struct nfs4_sequence_res *res;
7968
7969         args = task->tk_msg.rpc_argp;
7970         res = task->tk_msg.rpc_resp;
7971
7972         nfs41_setup_sequence(clp->cl_session, args, res, task);
7973 }
7974
7975 static const struct rpc_call_ops nfs41_sequence_ops = {
7976         .rpc_call_done = nfs41_sequence_call_done,
7977         .rpc_call_prepare = nfs41_sequence_prepare,
7978         .rpc_release = nfs41_sequence_release,
7979 };
7980
7981 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7982                 struct rpc_cred *cred,
7983                 bool is_privileged)
7984 {
7985         struct nfs4_sequence_data *calldata;
7986         struct rpc_message msg = {
7987                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7988                 .rpc_cred = cred,
7989         };
7990         struct rpc_task_setup task_setup_data = {
7991                 .rpc_client = clp->cl_rpcclient,
7992                 .rpc_message = &msg,
7993                 .callback_ops = &nfs41_sequence_ops,
7994                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7995         };
7996
7997         if (!atomic_inc_not_zero(&clp->cl_count))
7998                 return ERR_PTR(-EIO);
7999         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8000         if (calldata == NULL) {
8001                 nfs_put_client(clp);
8002                 return ERR_PTR(-ENOMEM);
8003         }
8004         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
8005         if (is_privileged)
8006                 nfs4_set_sequence_privileged(&calldata->args);
8007         msg.rpc_argp = &calldata->args;
8008         msg.rpc_resp = &calldata->res;
8009         calldata->clp = clp;
8010         task_setup_data.callback_data = calldata;
8011
8012         return rpc_run_task(&task_setup_data);
8013 }
8014
8015 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
8016 {
8017         struct rpc_task *task;
8018         int ret = 0;
8019
8020         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
8021                 return -EAGAIN;
8022         task = _nfs41_proc_sequence(clp, cred, false);
8023         if (IS_ERR(task))
8024                 ret = PTR_ERR(task);
8025         else
8026                 rpc_put_task_async(task);
8027         dprintk("<-- %s status=%d\n", __func__, ret);
8028         return ret;
8029 }
8030
8031 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
8032 {
8033         struct rpc_task *task;
8034         int ret;
8035
8036         task = _nfs41_proc_sequence(clp, cred, true);
8037         if (IS_ERR(task)) {
8038                 ret = PTR_ERR(task);
8039                 goto out;
8040         }
8041         ret = rpc_wait_for_completion_task(task);
8042         if (!ret)
8043                 ret = task->tk_status;
8044         rpc_put_task(task);
8045 out:
8046         dprintk("<-- %s status=%d\n", __func__, ret);
8047         return ret;
8048 }
8049
8050 struct nfs4_reclaim_complete_data {
8051         struct nfs_client *clp;
8052         struct nfs41_reclaim_complete_args arg;
8053         struct nfs41_reclaim_complete_res res;
8054 };
8055
8056 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
8057 {
8058         struct nfs4_reclaim_complete_data *calldata = data;
8059
8060         nfs41_setup_sequence(calldata->clp->cl_session,
8061                         &calldata->arg.seq_args,
8062                         &calldata->res.seq_res,
8063                         task);
8064 }
8065
8066 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
8067 {
8068         switch(task->tk_status) {
8069         case 0:
8070         case -NFS4ERR_COMPLETE_ALREADY:
8071         case -NFS4ERR_WRONG_CRED: /* What to do here? */
8072                 break;
8073         case -NFS4ERR_DELAY:
8074                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
8075                 /* fall through */
8076         case -NFS4ERR_RETRY_UNCACHED_REP:
8077                 return -EAGAIN;
8078         default:
8079                 nfs4_schedule_lease_recovery(clp);
8080         }
8081         return 0;
8082 }
8083
8084 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
8085 {
8086         struct nfs4_reclaim_complete_data *calldata = data;
8087         struct nfs_client *clp = calldata->clp;
8088         struct nfs4_sequence_res *res = &calldata->res.seq_res;
8089
8090         dprintk("--> %s\n", __func__);
8091         if (!nfs41_sequence_done(task, res))
8092                 return;
8093
8094         trace_nfs4_reclaim_complete(clp, task->tk_status);
8095         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
8096                 rpc_restart_call_prepare(task);
8097                 return;
8098         }
8099         dprintk("<-- %s\n", __func__);
8100 }
8101
8102 static void nfs4_free_reclaim_complete_data(void *data)
8103 {
8104         struct nfs4_reclaim_complete_data *calldata = data;
8105
8106         kfree(calldata);
8107 }
8108
8109 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
8110         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
8111         .rpc_call_done = nfs4_reclaim_complete_done,
8112         .rpc_release = nfs4_free_reclaim_complete_data,
8113 };
8114
8115 /*
8116  * Issue a global reclaim complete.
8117  */
8118 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
8119                 struct rpc_cred *cred)
8120 {
8121         struct nfs4_reclaim_complete_data *calldata;
8122         struct rpc_task *task;
8123         struct rpc_message msg = {
8124                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
8125                 .rpc_cred = cred,
8126         };
8127         struct rpc_task_setup task_setup_data = {
8128                 .rpc_client = clp->cl_rpcclient,
8129                 .rpc_message = &msg,
8130                 .callback_ops = &nfs4_reclaim_complete_call_ops,
8131                 .flags = RPC_TASK_ASYNC,
8132         };
8133         int status = -ENOMEM;
8134
8135         dprintk("--> %s\n", __func__);
8136         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
8137         if (calldata == NULL)
8138                 goto out;
8139         calldata->clp = clp;
8140         calldata->arg.one_fs = 0;
8141
8142         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
8143         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
8144         msg.rpc_argp = &calldata->arg;
8145         msg.rpc_resp = &calldata->res;
8146         task_setup_data.callback_data = calldata;
8147         task = rpc_run_task(&task_setup_data);
8148         if (IS_ERR(task)) {
8149                 status = PTR_ERR(task);
8150                 goto out;
8151         }
8152         status = nfs4_wait_for_completion_rpc_task(task);
8153         if (status == 0)
8154                 status = task->tk_status;
8155         rpc_put_task(task);
8156         return 0;
8157 out:
8158         dprintk("<-- %s status=%d\n", __func__, status);
8159         return status;
8160 }
8161
8162 static void
8163 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
8164 {
8165         struct nfs4_layoutget *lgp = calldata;
8166         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
8167         struct nfs4_session *session = nfs4_get_session(server);
8168
8169         dprintk("--> %s\n", __func__);
8170         nfs41_setup_sequence(session, &lgp->args.seq_args,
8171                                 &lgp->res.seq_res, task);
8172         dprintk("<-- %s\n", __func__);
8173 }
8174
8175 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
8176 {
8177         struct nfs4_layoutget *lgp = calldata;
8178
8179         dprintk("--> %s\n", __func__);
8180         nfs41_sequence_process(task, &lgp->res.seq_res);
8181         dprintk("<-- %s\n", __func__);
8182 }
8183
8184 static int
8185 nfs4_layoutget_handle_exception(struct rpc_task *task,
8186                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
8187 {
8188         struct inode *inode = lgp->args.inode;
8189         struct nfs_server *server = NFS_SERVER(inode);
8190         struct pnfs_layout_hdr *lo;
8191         int nfs4err = task->tk_status;
8192         int err, status = 0;
8193         LIST_HEAD(head);
8194
8195         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
8196
8197         switch (nfs4err) {
8198         case 0:
8199                 goto out;
8200
8201         /*
8202          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
8203          * on the file. set tk_status to -ENODATA to tell upper layer to
8204          * retry go inband.
8205          */
8206         case -NFS4ERR_LAYOUTUNAVAILABLE:
8207                 status = -ENODATA;
8208                 goto out;
8209         /*
8210          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
8211          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
8212          */
8213         case -NFS4ERR_BADLAYOUT:
8214                 status = -EOVERFLOW;
8215                 goto out;
8216         /*
8217          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
8218          * (or clients) writing to the same RAID stripe except when
8219          * the minlength argument is 0 (see RFC5661 section 18.43.3).
8220          *
8221          * Treat it like we would RECALLCONFLICT -- we retry for a little
8222          * while, and then eventually give up.
8223          */
8224         case -NFS4ERR_LAYOUTTRYLATER:
8225                 if (lgp->args.minlength == 0) {
8226                         status = -EOVERFLOW;
8227                         goto out;
8228                 }
8229                 status = -EBUSY;
8230                 break;
8231         case -NFS4ERR_RECALLCONFLICT:
8232                 status = -ERECALLCONFLICT;
8233                 break;
8234         case -NFS4ERR_EXPIRED:
8235         case -NFS4ERR_BAD_STATEID:
8236                 exception->timeout = 0;
8237                 spin_lock(&inode->i_lock);
8238                 lo = NFS_I(inode)->layout;
8239                 /* If the open stateid was bad, then recover it. */
8240                 if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
8241                     nfs4_stateid_match_other(&lgp->args.stateid,
8242                                         &lgp->args.ctx->state->stateid)) {
8243                         spin_unlock(&inode->i_lock);
8244                         exception->state = lgp->args.ctx->state;
8245                         break;
8246                 }
8247
8248                 /*
8249                  * Mark the bad layout state as invalid, then retry
8250                  */
8251                 pnfs_mark_layout_stateid_invalid(lo, &head);
8252                 spin_unlock(&inode->i_lock);
8253                 pnfs_free_lseg_list(&head);
8254                 status = -EAGAIN;
8255                 goto out;
8256         }
8257
8258         err = nfs4_handle_exception(server, nfs4err, exception);
8259         if (!status) {
8260                 if (exception->retry)
8261                         status = -EAGAIN;
8262                 else
8263                         status = err;
8264         }
8265 out:
8266         dprintk("<-- %s\n", __func__);
8267         return status;
8268 }
8269
8270 static size_t max_response_pages(struct nfs_server *server)
8271 {
8272         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
8273         return nfs_page_array_len(0, max_resp_sz);
8274 }
8275
8276 static void nfs4_free_pages(struct page **pages, size_t size)
8277 {
8278         int i;
8279
8280         if (!pages)
8281                 return;
8282
8283         for (i = 0; i < size; i++) {
8284                 if (!pages[i])
8285                         break;
8286                 __free_page(pages[i]);
8287         }
8288         kfree(pages);
8289 }
8290
8291 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
8292 {
8293         struct page **pages;
8294         int i;
8295
8296         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
8297         if (!pages) {
8298                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
8299                 return NULL;
8300         }
8301
8302         for (i = 0; i < size; i++) {
8303                 pages[i] = alloc_page(gfp_flags);
8304                 if (!pages[i]) {
8305                         dprintk("%s: failed to allocate page\n", __func__);
8306                         nfs4_free_pages(pages, size);
8307                         return NULL;
8308                 }
8309         }
8310
8311         return pages;
8312 }
8313
8314 static void nfs4_layoutget_release(void *calldata)
8315 {
8316         struct nfs4_layoutget *lgp = calldata;
8317         struct inode *inode = lgp->args.inode;
8318         struct nfs_server *server = NFS_SERVER(inode);
8319         size_t max_pages = max_response_pages(server);
8320
8321         dprintk("--> %s\n", __func__);
8322         nfs4_free_pages(lgp->args.layout.pages, max_pages);
8323         pnfs_put_layout_hdr(NFS_I(inode)->layout);
8324         put_nfs_open_context(lgp->args.ctx);
8325         kfree(calldata);
8326         dprintk("<-- %s\n", __func__);
8327 }
8328
8329 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
8330         .rpc_call_prepare = nfs4_layoutget_prepare,
8331         .rpc_call_done = nfs4_layoutget_done,
8332         .rpc_release = nfs4_layoutget_release,
8333 };
8334
8335 struct pnfs_layout_segment *
8336 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags)
8337 {
8338         struct inode *inode = lgp->args.inode;
8339         struct nfs_server *server = NFS_SERVER(inode);
8340         size_t max_pages = max_response_pages(server);
8341         struct rpc_task *task;
8342         struct rpc_message msg = {
8343                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
8344                 .rpc_argp = &lgp->args,
8345                 .rpc_resp = &lgp->res,
8346                 .rpc_cred = lgp->cred,
8347         };
8348         struct rpc_task_setup task_setup_data = {
8349                 .rpc_client = server->client,
8350                 .rpc_message = &msg,
8351                 .callback_ops = &nfs4_layoutget_call_ops,
8352                 .callback_data = lgp,
8353                 .flags = RPC_TASK_ASYNC,
8354         };
8355         struct pnfs_layout_segment *lseg = NULL;
8356         struct nfs4_exception exception = {
8357                 .inode = inode,
8358                 .timeout = *timeout,
8359         };
8360         int status = 0;
8361
8362         dprintk("--> %s\n", __func__);
8363
8364         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
8365         pnfs_get_layout_hdr(NFS_I(inode)->layout);
8366
8367         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
8368         if (!lgp->args.layout.pages) {
8369                 nfs4_layoutget_release(lgp);
8370                 return ERR_PTR(-ENOMEM);
8371         }
8372         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
8373
8374         lgp->res.layoutp = &lgp->args.layout;
8375         lgp->res.seq_res.sr_slot = NULL;
8376         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
8377
8378         task = rpc_run_task(&task_setup_data);
8379         if (IS_ERR(task))
8380                 return ERR_CAST(task);
8381         status = nfs4_wait_for_completion_rpc_task(task);
8382         if (status == 0) {
8383                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
8384                 *timeout = exception.timeout;
8385         }
8386
8387         trace_nfs4_layoutget(lgp->args.ctx,
8388                         &lgp->args.range,
8389                         &lgp->res.range,
8390                         &lgp->res.stateid,
8391                         status);
8392
8393         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
8394         if (status == 0 && lgp->res.layoutp->len)
8395                 lseg = pnfs_layout_process(lgp);
8396         nfs4_sequence_free_slot(&lgp->res.seq_res);
8397         rpc_put_task(task);
8398         dprintk("<-- %s status=%d\n", __func__, status);
8399         if (status)
8400                 return ERR_PTR(status);
8401         return lseg;
8402 }
8403
8404 static void
8405 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
8406 {
8407         struct nfs4_layoutreturn *lrp = calldata;
8408
8409         dprintk("--> %s\n", __func__);
8410         nfs41_setup_sequence(lrp->clp->cl_session,
8411                         &lrp->args.seq_args,
8412                         &lrp->res.seq_res,
8413                         task);
8414 }
8415
8416 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
8417 {
8418         struct nfs4_layoutreturn *lrp = calldata;
8419         struct nfs_server *server;
8420
8421         dprintk("--> %s\n", __func__);
8422
8423         if (!nfs41_sequence_process(task, &lrp->res.seq_res))
8424                 return;
8425
8426         server = NFS_SERVER(lrp->args.inode);
8427         switch (task->tk_status) {
8428         default:
8429                 task->tk_status = 0;
8430         case 0:
8431                 break;
8432         case -NFS4ERR_DELAY:
8433                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
8434                         break;
8435                 nfs4_sequence_free_slot(&lrp->res.seq_res);
8436                 rpc_restart_call_prepare(task);
8437                 return;
8438         }
8439         dprintk("<-- %s\n", __func__);
8440 }
8441
8442 static void nfs4_layoutreturn_release(void *calldata)
8443 {
8444         struct nfs4_layoutreturn *lrp = calldata;
8445         struct pnfs_layout_hdr *lo = lrp->args.layout;
8446         LIST_HEAD(freeme);
8447
8448         dprintk("--> %s\n", __func__);
8449         spin_lock(&lo->plh_inode->i_lock);
8450         if (lrp->res.lrs_present) {
8451                 pnfs_mark_matching_lsegs_invalid(lo, &freeme,
8452                                 &lrp->args.range,
8453                                 be32_to_cpu(lrp->args.stateid.seqid));
8454                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
8455         } else
8456                 pnfs_mark_layout_stateid_invalid(lo, &freeme);
8457         pnfs_clear_layoutreturn_waitbit(lo);
8458         spin_unlock(&lo->plh_inode->i_lock);
8459         nfs4_sequence_free_slot(&lrp->res.seq_res);
8460         pnfs_free_lseg_list(&freeme);
8461         pnfs_put_layout_hdr(lrp->args.layout);
8462         nfs_iput_and_deactive(lrp->inode);
8463         kfree(calldata);
8464         dprintk("<-- %s\n", __func__);
8465 }
8466
8467 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
8468         .rpc_call_prepare = nfs4_layoutreturn_prepare,
8469         .rpc_call_done = nfs4_layoutreturn_done,
8470         .rpc_release = nfs4_layoutreturn_release,
8471 };
8472
8473 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
8474 {
8475         struct rpc_task *task;
8476         struct rpc_message msg = {
8477                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
8478                 .rpc_argp = &lrp->args,
8479                 .rpc_resp = &lrp->res,
8480                 .rpc_cred = lrp->cred,
8481         };
8482         struct rpc_task_setup task_setup_data = {
8483                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
8484                 .rpc_message = &msg,
8485                 .callback_ops = &nfs4_layoutreturn_call_ops,
8486                 .callback_data = lrp,
8487         };
8488         int status = 0;
8489
8490         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
8491                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
8492                         &task_setup_data.rpc_client, &msg);
8493
8494         dprintk("--> %s\n", __func__);
8495         if (!sync) {
8496                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
8497                 if (!lrp->inode) {
8498                         nfs4_layoutreturn_release(lrp);
8499                         return -EAGAIN;
8500                 }
8501                 task_setup_data.flags |= RPC_TASK_ASYNC;
8502         }
8503         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
8504         task = rpc_run_task(&task_setup_data);
8505         if (IS_ERR(task))
8506                 return PTR_ERR(task);
8507         if (sync)
8508                 status = task->tk_status;
8509         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
8510         dprintk("<-- %s status=%d\n", __func__, status);
8511         rpc_put_task(task);
8512         return status;
8513 }
8514
8515 static int
8516 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
8517                 struct pnfs_device *pdev,
8518                 struct rpc_cred *cred)
8519 {
8520         struct nfs4_getdeviceinfo_args args = {
8521                 .pdev = pdev,
8522                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
8523                         NOTIFY_DEVICEID4_DELETE,
8524         };
8525         struct nfs4_getdeviceinfo_res res = {
8526                 .pdev = pdev,
8527         };
8528         struct rpc_message msg = {
8529                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
8530                 .rpc_argp = &args,
8531                 .rpc_resp = &res,
8532                 .rpc_cred = cred,
8533         };
8534         int status;
8535
8536         dprintk("--> %s\n", __func__);
8537         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
8538         if (res.notification & ~args.notify_types)
8539                 dprintk("%s: unsupported notification\n", __func__);
8540         if (res.notification != args.notify_types)
8541                 pdev->nocache = 1;
8542
8543         dprintk("<-- %s status=%d\n", __func__, status);
8544
8545         return status;
8546 }
8547
8548 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
8549                 struct pnfs_device *pdev,
8550                 struct rpc_cred *cred)
8551 {
8552         struct nfs4_exception exception = { };
8553         int err;
8554
8555         do {
8556                 err = nfs4_handle_exception(server,
8557                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
8558                                         &exception);
8559         } while (exception.retry);
8560         return err;
8561 }
8562 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
8563
8564 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
8565 {
8566         struct nfs4_layoutcommit_data *data = calldata;
8567         struct nfs_server *server = NFS_SERVER(data->args.inode);
8568         struct nfs4_session *session = nfs4_get_session(server);
8569
8570         nfs41_setup_sequence(session,
8571                         &data->args.seq_args,
8572                         &data->res.seq_res,
8573                         task);
8574 }
8575
8576 static void
8577 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
8578 {
8579         struct nfs4_layoutcommit_data *data = calldata;
8580         struct nfs_server *server = NFS_SERVER(data->args.inode);
8581
8582         if (!nfs41_sequence_done(task, &data->res.seq_res))
8583                 return;
8584
8585         switch (task->tk_status) { /* Just ignore these failures */
8586         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
8587         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
8588         case -NFS4ERR_BADLAYOUT:     /* no layout */
8589         case -NFS4ERR_GRACE:        /* loca_recalim always false */
8590                 task->tk_status = 0;
8591         case 0:
8592                 break;
8593         default:
8594                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
8595                         rpc_restart_call_prepare(task);
8596                         return;
8597                 }
8598         }
8599 }
8600
8601 static void nfs4_layoutcommit_release(void *calldata)
8602 {
8603         struct nfs4_layoutcommit_data *data = calldata;
8604
8605         pnfs_cleanup_layoutcommit(data);
8606         nfs_post_op_update_inode_force_wcc(data->args.inode,
8607                                            data->res.fattr);
8608         put_rpccred(data->cred);
8609         nfs_iput_and_deactive(data->inode);
8610         kfree(data);
8611 }
8612
8613 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
8614         .rpc_call_prepare = nfs4_layoutcommit_prepare,
8615         .rpc_call_done = nfs4_layoutcommit_done,
8616         .rpc_release = nfs4_layoutcommit_release,
8617 };
8618
8619 int
8620 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
8621 {
8622         struct rpc_message msg = {
8623                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
8624                 .rpc_argp = &data->args,
8625                 .rpc_resp = &data->res,
8626                 .rpc_cred = data->cred,
8627         };
8628         struct rpc_task_setup task_setup_data = {
8629                 .task = &data->task,
8630                 .rpc_client = NFS_CLIENT(data->args.inode),
8631                 .rpc_message = &msg,
8632                 .callback_ops = &nfs4_layoutcommit_ops,
8633                 .callback_data = data,
8634         };
8635         struct rpc_task *task;
8636         int status = 0;
8637
8638         dprintk("NFS: initiating layoutcommit call. sync %d "
8639                 "lbw: %llu inode %lu\n", sync,
8640                 data->args.lastbytewritten,
8641                 data->args.inode->i_ino);
8642
8643         if (!sync) {
8644                 data->inode = nfs_igrab_and_active(data->args.inode);
8645                 if (data->inode == NULL) {
8646                         nfs4_layoutcommit_release(data);
8647                         return -EAGAIN;
8648                 }
8649                 task_setup_data.flags = RPC_TASK_ASYNC;
8650         }
8651         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8652         task = rpc_run_task(&task_setup_data);
8653         if (IS_ERR(task))
8654                 return PTR_ERR(task);
8655         if (sync)
8656                 status = task->tk_status;
8657         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
8658         dprintk("%s: status %d\n", __func__, status);
8659         rpc_put_task(task);
8660         return status;
8661 }
8662
8663 /**
8664  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8665  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8666  */
8667 static int
8668 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8669                     struct nfs_fsinfo *info,
8670                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8671 {
8672         struct nfs41_secinfo_no_name_args args = {
8673                 .style = SECINFO_STYLE_CURRENT_FH,
8674         };
8675         struct nfs4_secinfo_res res = {
8676                 .flavors = flavors,
8677         };
8678         struct rpc_message msg = {
8679                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8680                 .rpc_argp = &args,
8681                 .rpc_resp = &res,
8682         };
8683         struct rpc_clnt *clnt = server->client;
8684         struct rpc_cred *cred = NULL;
8685         int status;
8686
8687         if (use_integrity) {
8688                 clnt = server->nfs_client->cl_rpcclient;
8689                 cred = nfs4_get_clid_cred(server->nfs_client);
8690                 msg.rpc_cred = cred;
8691         }
8692
8693         dprintk("--> %s\n", __func__);
8694         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8695                                 &res.seq_res, 0);
8696         dprintk("<-- %s status=%d\n", __func__, status);
8697
8698         if (cred)
8699                 put_rpccred(cred);
8700
8701         return status;
8702 }
8703
8704 static int
8705 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8706                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8707 {
8708         struct nfs4_exception exception = { };
8709         int err;
8710         do {
8711                 /* first try using integrity protection */
8712                 err = -NFS4ERR_WRONGSEC;
8713
8714                 /* try to use integrity protection with machine cred */
8715                 if (_nfs4_is_integrity_protected(server->nfs_client))
8716                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8717                                                           flavors, true);
8718
8719                 /*
8720                  * if unable to use integrity protection, or SECINFO with
8721                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8722                  * disallowed by spec, but exists in deployed servers) use
8723                  * the current filesystem's rpc_client and the user cred.
8724                  */
8725                 if (err == -NFS4ERR_WRONGSEC)
8726                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8727                                                           flavors, false);
8728
8729                 switch (err) {
8730                 case 0:
8731                 case -NFS4ERR_WRONGSEC:
8732                 case -ENOTSUPP:
8733                         goto out;
8734                 default:
8735                         err = nfs4_handle_exception(server, err, &exception);
8736                 }
8737         } while (exception.retry);
8738 out:
8739         return err;
8740 }
8741
8742 static int
8743 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8744                     struct nfs_fsinfo *info)
8745 {
8746         int err;
8747         struct page *page;
8748         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8749         struct nfs4_secinfo_flavors *flavors;
8750         struct nfs4_secinfo4 *secinfo;
8751         int i;
8752
8753         page = alloc_page(GFP_KERNEL);
8754         if (!page) {
8755                 err = -ENOMEM;
8756                 goto out;
8757         }
8758
8759         flavors = page_address(page);
8760         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8761
8762         /*
8763          * Fall back on "guess and check" method if
8764          * the server doesn't support SECINFO_NO_NAME
8765          */
8766         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8767                 err = nfs4_find_root_sec(server, fhandle, info);
8768                 goto out_freepage;
8769         }
8770         if (err)
8771                 goto out_freepage;
8772
8773         for (i = 0; i < flavors->num_flavors; i++) {
8774                 secinfo = &flavors->flavors[i];
8775
8776                 switch (secinfo->flavor) {
8777                 case RPC_AUTH_NULL:
8778                 case RPC_AUTH_UNIX:
8779                 case RPC_AUTH_GSS:
8780                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8781                                         &secinfo->flavor_info);
8782                         break;
8783                 default:
8784                         flavor = RPC_AUTH_MAXFLAVOR;
8785                         break;
8786                 }
8787
8788                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8789                         flavor = RPC_AUTH_MAXFLAVOR;
8790
8791                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8792                         err = nfs4_lookup_root_sec(server, fhandle,
8793                                                    info, flavor);
8794                         if (!err)
8795                                 break;
8796                 }
8797         }
8798
8799         if (flavor == RPC_AUTH_MAXFLAVOR)
8800                 err = -EPERM;
8801
8802 out_freepage:
8803         put_page(page);
8804         if (err == -EACCES)
8805                 return -EPERM;
8806 out:
8807         return err;
8808 }
8809
8810 static int _nfs41_test_stateid(struct nfs_server *server,
8811                 nfs4_stateid *stateid,
8812                 struct rpc_cred *cred)
8813 {
8814         int status;
8815         struct nfs41_test_stateid_args args = {
8816                 .stateid = stateid,
8817         };
8818         struct nfs41_test_stateid_res res;
8819         struct rpc_message msg = {
8820                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8821                 .rpc_argp = &args,
8822                 .rpc_resp = &res,
8823                 .rpc_cred = cred,
8824         };
8825         struct rpc_clnt *rpc_client = server->client;
8826
8827         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8828                 &rpc_client, &msg);
8829
8830         dprintk("NFS call  test_stateid %p\n", stateid);
8831         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8832         nfs4_set_sequence_privileged(&args.seq_args);
8833         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8834                         &args.seq_args, &res.seq_res);
8835         if (status != NFS_OK) {
8836                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8837                 return status;
8838         }
8839         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8840         return -res.status;
8841 }
8842
8843 static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
8844                 int err, struct nfs4_exception *exception)
8845 {
8846         exception->retry = 0;
8847         switch(err) {
8848         case -NFS4ERR_DELAY:
8849                 nfs4_handle_exception(server, err, exception);
8850                 break;
8851         case -NFS4ERR_BADSESSION:
8852         case -NFS4ERR_BADSLOT:
8853         case -NFS4ERR_BAD_HIGH_SLOT:
8854         case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
8855         case -NFS4ERR_DEADSESSION:
8856                 nfs4_do_handle_exception(server, err, exception);
8857         }
8858 }
8859
8860 /**
8861  * nfs41_test_stateid - perform a TEST_STATEID operation
8862  *
8863  * @server: server / transport on which to perform the operation
8864  * @stateid: state ID to test
8865  * @cred: credential
8866  *
8867  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8868  * Otherwise a negative NFS4ERR value is returned if the operation
8869  * failed or the state ID is not currently valid.
8870  */
8871 static int nfs41_test_stateid(struct nfs_server *server,
8872                 nfs4_stateid *stateid,
8873                 struct rpc_cred *cred)
8874 {
8875         struct nfs4_exception exception = { };
8876         int err;
8877         do {
8878                 err = _nfs41_test_stateid(server, stateid, cred);
8879                 nfs4_handle_delay_or_session_error(server, err, &exception);
8880         } while (exception.retry);
8881         return err;
8882 }
8883
8884 struct nfs_free_stateid_data {
8885         struct nfs_server *server;
8886         struct nfs41_free_stateid_args args;
8887         struct nfs41_free_stateid_res res;
8888 };
8889
8890 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8891 {
8892         struct nfs_free_stateid_data *data = calldata;
8893         nfs41_setup_sequence(nfs4_get_session(data->server),
8894                         &data->args.seq_args,
8895                         &data->res.seq_res,
8896                         task);
8897 }
8898
8899 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8900 {
8901         struct nfs_free_stateid_data *data = calldata;
8902
8903         nfs41_sequence_done(task, &data->res.seq_res);
8904
8905         switch (task->tk_status) {
8906         case -NFS4ERR_DELAY:
8907                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8908                         rpc_restart_call_prepare(task);
8909         }
8910 }
8911
8912 static void nfs41_free_stateid_release(void *calldata)
8913 {
8914         kfree(calldata);
8915 }
8916
8917 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8918         .rpc_call_prepare = nfs41_free_stateid_prepare,
8919         .rpc_call_done = nfs41_free_stateid_done,
8920         .rpc_release = nfs41_free_stateid_release,
8921 };
8922
8923 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8924                 nfs4_stateid *stateid,
8925                 struct rpc_cred *cred,
8926                 bool privileged)
8927 {
8928         struct rpc_message msg = {
8929                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8930                 .rpc_cred = cred,
8931         };
8932         struct rpc_task_setup task_setup = {
8933                 .rpc_client = server->client,
8934                 .rpc_message = &msg,
8935                 .callback_ops = &nfs41_free_stateid_ops,
8936                 .flags = RPC_TASK_ASYNC,
8937         };
8938         struct nfs_free_stateid_data *data;
8939
8940         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8941                 &task_setup.rpc_client, &msg);
8942
8943         dprintk("NFS call  free_stateid %p\n", stateid);
8944         data = kmalloc(sizeof(*data), GFP_NOFS);
8945         if (!data)
8946                 return ERR_PTR(-ENOMEM);
8947         data->server = server;
8948         nfs4_stateid_copy(&data->args.stateid, stateid);
8949
8950         task_setup.callback_data = data;
8951
8952         msg.rpc_argp = &data->args;
8953         msg.rpc_resp = &data->res;
8954         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8955         if (privileged)
8956                 nfs4_set_sequence_privileged(&data->args.seq_args);
8957
8958         return rpc_run_task(&task_setup);
8959 }
8960
8961 /**
8962  * nfs41_free_stateid - perform a FREE_STATEID operation
8963  *
8964  * @server: server / transport on which to perform the operation
8965  * @stateid: state ID to release
8966  * @cred: credential
8967  *
8968  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8969  * negative NFS4ERR value is returned.
8970  */
8971 static int nfs41_free_stateid(struct nfs_server *server,
8972                 nfs4_stateid *stateid,
8973                 struct rpc_cred *cred)
8974 {
8975         struct rpc_task *task;
8976         int ret;
8977
8978         task = _nfs41_free_stateid(server, stateid, cred, true);
8979         if (IS_ERR(task))
8980                 return PTR_ERR(task);
8981         ret = rpc_wait_for_completion_task(task);
8982         if (!ret)
8983                 ret = task->tk_status;
8984         rpc_put_task(task);
8985         return ret;
8986 }
8987
8988 static void
8989 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8990 {
8991         struct rpc_task *task;
8992         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8993
8994         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8995         nfs4_free_lock_state(server, lsp);
8996         if (IS_ERR(task))
8997                 return;
8998         rpc_put_task(task);
8999 }
9000
9001 static bool nfs41_match_stateid(const nfs4_stateid *s1,
9002                 const nfs4_stateid *s2)
9003 {
9004         if (s1->type != s2->type)
9005                 return false;
9006
9007         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
9008                 return false;
9009
9010         if (s1->seqid == s2->seqid)
9011                 return true;
9012         if (s1->seqid == 0 || s2->seqid == 0)
9013                 return true;
9014
9015         return false;
9016 }
9017
9018 #endif /* CONFIG_NFS_V4_1 */
9019
9020 static bool nfs4_match_stateid(const nfs4_stateid *s1,
9021                 const nfs4_stateid *s2)
9022 {
9023         return nfs4_stateid_match(s1, s2);
9024 }
9025
9026
9027 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
9028         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
9029         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
9030         .recover_open   = nfs4_open_reclaim,
9031         .recover_lock   = nfs4_lock_reclaim,
9032         .establish_clid = nfs4_init_clientid,
9033         .detect_trunking = nfs40_discover_server_trunking,
9034 };
9035
9036 #if defined(CONFIG_NFS_V4_1)
9037 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
9038         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
9039         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
9040         .recover_open   = nfs4_open_reclaim,
9041         .recover_lock   = nfs4_lock_reclaim,
9042         .establish_clid = nfs41_init_clientid,
9043         .reclaim_complete = nfs41_proc_reclaim_complete,
9044         .detect_trunking = nfs41_discover_server_trunking,
9045 };
9046 #endif /* CONFIG_NFS_V4_1 */
9047
9048 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
9049         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
9050         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
9051         .recover_open   = nfs40_open_expired,
9052         .recover_lock   = nfs4_lock_expired,
9053         .establish_clid = nfs4_init_clientid,
9054 };
9055
9056 #if defined(CONFIG_NFS_V4_1)
9057 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
9058         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
9059         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
9060         .recover_open   = nfs41_open_expired,
9061         .recover_lock   = nfs41_lock_expired,
9062         .establish_clid = nfs41_init_clientid,
9063 };
9064 #endif /* CONFIG_NFS_V4_1 */
9065
9066 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
9067         .sched_state_renewal = nfs4_proc_async_renew,
9068         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
9069         .renew_lease = nfs4_proc_renew,
9070 };
9071
9072 #if defined(CONFIG_NFS_V4_1)
9073 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
9074         .sched_state_renewal = nfs41_proc_async_sequence,
9075         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
9076         .renew_lease = nfs4_proc_sequence,
9077 };
9078 #endif
9079
9080 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
9081         .get_locations = _nfs40_proc_get_locations,
9082         .fsid_present = _nfs40_proc_fsid_present,
9083 };
9084
9085 #if defined(CONFIG_NFS_V4_1)
9086 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
9087         .get_locations = _nfs41_proc_get_locations,
9088         .fsid_present = _nfs41_proc_fsid_present,
9089 };
9090 #endif  /* CONFIG_NFS_V4_1 */
9091
9092 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
9093         .minor_version = 0,
9094         .init_caps = NFS_CAP_READDIRPLUS
9095                 | NFS_CAP_ATOMIC_OPEN
9096                 | NFS_CAP_POSIX_LOCK,
9097         .init_client = nfs40_init_client,
9098         .shutdown_client = nfs40_shutdown_client,
9099         .match_stateid = nfs4_match_stateid,
9100         .find_root_sec = nfs4_find_root_sec,
9101         .free_lock_state = nfs4_release_lockowner,
9102         .test_and_free_expired = nfs40_test_and_free_expired_stateid,
9103         .alloc_seqid = nfs_alloc_seqid,
9104         .call_sync_ops = &nfs40_call_sync_ops,
9105         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
9106         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
9107         .state_renewal_ops = &nfs40_state_renewal_ops,
9108         .mig_recovery_ops = &nfs40_mig_recovery_ops,
9109 };
9110
9111 #if defined(CONFIG_NFS_V4_1)
9112 static struct nfs_seqid *
9113 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
9114 {
9115         return NULL;
9116 }
9117
9118 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
9119         .minor_version = 1,
9120         .init_caps = NFS_CAP_READDIRPLUS
9121                 | NFS_CAP_ATOMIC_OPEN
9122                 | NFS_CAP_POSIX_LOCK
9123                 | NFS_CAP_STATEID_NFSV41
9124                 | NFS_CAP_ATOMIC_OPEN_V1,
9125         .init_client = nfs41_init_client,
9126         .shutdown_client = nfs41_shutdown_client,
9127         .match_stateid = nfs41_match_stateid,
9128         .find_root_sec = nfs41_find_root_sec,
9129         .free_lock_state = nfs41_free_lock_state,
9130         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
9131         .alloc_seqid = nfs_alloc_no_seqid,
9132         .session_trunk = nfs4_test_session_trunk,
9133         .call_sync_ops = &nfs41_call_sync_ops,
9134         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
9135         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
9136         .state_renewal_ops = &nfs41_state_renewal_ops,
9137         .mig_recovery_ops = &nfs41_mig_recovery_ops,
9138 };
9139 #endif
9140
9141 #if defined(CONFIG_NFS_V4_2)
9142 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
9143         .minor_version = 2,
9144         .init_caps = NFS_CAP_READDIRPLUS
9145                 | NFS_CAP_ATOMIC_OPEN
9146                 | NFS_CAP_POSIX_LOCK
9147                 | NFS_CAP_STATEID_NFSV41
9148                 | NFS_CAP_ATOMIC_OPEN_V1
9149                 | NFS_CAP_ALLOCATE
9150                 | NFS_CAP_COPY
9151                 | NFS_CAP_DEALLOCATE
9152                 | NFS_CAP_SEEK
9153                 | NFS_CAP_LAYOUTSTATS
9154                 | NFS_CAP_CLONE,
9155         .init_client = nfs41_init_client,
9156         .shutdown_client = nfs41_shutdown_client,
9157         .match_stateid = nfs41_match_stateid,
9158         .find_root_sec = nfs41_find_root_sec,
9159         .free_lock_state = nfs41_free_lock_state,
9160         .call_sync_ops = &nfs41_call_sync_ops,
9161         .test_and_free_expired = nfs41_test_and_free_expired_stateid,
9162         .alloc_seqid = nfs_alloc_no_seqid,
9163         .session_trunk = nfs4_test_session_trunk,
9164         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
9165         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
9166         .state_renewal_ops = &nfs41_state_renewal_ops,
9167         .mig_recovery_ops = &nfs41_mig_recovery_ops,
9168 };
9169 #endif
9170
9171 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
9172         [0] = &nfs_v4_0_minor_ops,
9173 #if defined(CONFIG_NFS_V4_1)
9174         [1] = &nfs_v4_1_minor_ops,
9175 #endif
9176 #if defined(CONFIG_NFS_V4_2)
9177         [2] = &nfs_v4_2_minor_ops,
9178 #endif
9179 };
9180
9181 static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
9182 {
9183         ssize_t error, error2;
9184
9185         error = generic_listxattr(dentry, list, size);
9186         if (error < 0)
9187                 return error;
9188         if (list) {
9189                 list += error;
9190                 size -= error;
9191         }
9192
9193         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
9194         if (error2 < 0)
9195                 return error2;
9196         return error + error2;
9197 }
9198
9199 static const struct inode_operations nfs4_dir_inode_operations = {
9200         .create         = nfs_create,
9201         .lookup         = nfs_lookup,
9202         .atomic_open    = nfs_atomic_open,
9203         .link           = nfs_link,
9204         .unlink         = nfs_unlink,
9205         .symlink        = nfs_symlink,
9206         .mkdir          = nfs_mkdir,
9207         .rmdir          = nfs_rmdir,
9208         .mknod          = nfs_mknod,
9209         .rename         = nfs_rename,
9210         .permission     = nfs_permission,
9211         .getattr        = nfs_getattr,
9212         .setattr        = nfs_setattr,
9213         .getxattr       = generic_getxattr,
9214         .setxattr       = generic_setxattr,
9215         .listxattr      = nfs4_listxattr,
9216         .removexattr    = generic_removexattr,
9217 };
9218
9219 static const struct inode_operations nfs4_file_inode_operations = {
9220         .permission     = nfs_permission,
9221         .getattr        = nfs_getattr,
9222         .setattr        = nfs_setattr,
9223         .getxattr       = generic_getxattr,
9224         .setxattr       = generic_setxattr,
9225         .listxattr      = nfs4_listxattr,
9226         .removexattr    = generic_removexattr,
9227 };
9228
9229 const struct nfs_rpc_ops nfs_v4_clientops = {
9230         .version        = 4,                    /* protocol version */
9231         .dentry_ops     = &nfs4_dentry_operations,
9232         .dir_inode_ops  = &nfs4_dir_inode_operations,
9233         .file_inode_ops = &nfs4_file_inode_operations,
9234         .file_ops       = &nfs4_file_operations,
9235         .getroot        = nfs4_proc_get_root,
9236         .submount       = nfs4_submount,
9237         .try_mount      = nfs4_try_mount,
9238         .getattr        = nfs4_proc_getattr,
9239         .setattr        = nfs4_proc_setattr,
9240         .lookup         = nfs4_proc_lookup,
9241         .access         = nfs4_proc_access,
9242         .readlink       = nfs4_proc_readlink,
9243         .create         = nfs4_proc_create,
9244         .remove         = nfs4_proc_remove,
9245         .unlink_setup   = nfs4_proc_unlink_setup,
9246         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
9247         .unlink_done    = nfs4_proc_unlink_done,
9248         .rename_setup   = nfs4_proc_rename_setup,
9249         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
9250         .rename_done    = nfs4_proc_rename_done,
9251         .link           = nfs4_proc_link,
9252         .symlink        = nfs4_proc_symlink,
9253         .mkdir          = nfs4_proc_mkdir,
9254         .rmdir          = nfs4_proc_remove,
9255         .readdir        = nfs4_proc_readdir,
9256         .mknod          = nfs4_proc_mknod,
9257         .statfs         = nfs4_proc_statfs,
9258         .fsinfo         = nfs4_proc_fsinfo,
9259         .pathconf       = nfs4_proc_pathconf,
9260         .set_capabilities = nfs4_server_capabilities,
9261         .decode_dirent  = nfs4_decode_dirent,
9262         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
9263         .read_setup     = nfs4_proc_read_setup,
9264         .read_done      = nfs4_read_done,
9265         .write_setup    = nfs4_proc_write_setup,
9266         .write_done     = nfs4_write_done,
9267         .commit_setup   = nfs4_proc_commit_setup,
9268         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
9269         .commit_done    = nfs4_commit_done,
9270         .lock           = nfs4_proc_lock,
9271         .clear_acl_cache = nfs4_zap_acl_attr,
9272         .close_context  = nfs4_close_context,
9273         .open_context   = nfs4_atomic_open,
9274         .have_delegation = nfs4_have_delegation,
9275         .return_delegation = nfs4_inode_return_delegation,
9276         .alloc_client   = nfs4_alloc_client,
9277         .init_client    = nfs4_init_client,
9278         .free_client    = nfs4_free_client,
9279         .create_server  = nfs4_create_server,
9280         .clone_server   = nfs_clone_server,
9281 };
9282
9283 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
9284         .name   = XATTR_NAME_NFSV4_ACL,
9285         .list   = nfs4_xattr_list_nfs4_acl,
9286         .get    = nfs4_xattr_get_nfs4_acl,
9287         .set    = nfs4_xattr_set_nfs4_acl,
9288 };
9289
9290 const struct xattr_handler *nfs4_xattr_handlers[] = {
9291         &nfs4_xattr_nfs4_acl_handler,
9292 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
9293         &nfs4_xattr_nfs4_label_handler,
9294 #endif
9295         NULL
9296 };
9297
9298 /*
9299  * Local variables:
9300  *  c-basic-offset: 8
9301  * End:
9302  */