fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/delay.h>
  40 #include <linux/errno.h>
  41 #include <linux/file.h>
  42 #include <linux/string.h>
  43 #include <linux/ratelimit.h>
  44 #include <linux/printk.h>
  45 #include <linux/slab.h>
  46 #include <linux/sunrpc/clnt.h>
  47 #include <linux/nfs.h>
  48 #include <linux/nfs4.h>
  49 #include <linux/nfs_fs.h>
  50 #include <linux/nfs_page.h>
  51 #include <linux/nfs_mount.h>
  52 #include <linux/namei.h>
  53 #include <linux/mount.h>
  54 #include <linux/module.h>
  55 #include <linux/xattr.h>
  56 #include <linux/utsname.h>
  57 #include <linux/freezer.h>
  58
  59 #include "nfs4_fs.h"
  60 #include "delegation.h"
  61 #include "internal.h"
  62 #include "iostat.h"
  63 #include "callback.h"
  64 #include "pnfs.h"
  65 #include "netns.h"
  66 #include "nfs4idmap.h"
  67 #include "nfs4session.h"
  68 #include "fscache.h"
  69
  70 #include "nfs4trace.h"
  71
  72 #define NFSDBG_FACILITY         NFSDBG_PROC
  73
  74 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  75 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  76
  77 /* file attributes which can be mapped to nfs attributes */
  78 #define NFS4_VALID_ATTRS (ATTR_MODE \
  79         | ATTR_UID \
  80         | ATTR_GID \
  81         | ATTR_SIZE \
  82         | ATTR_ATIME \
  83         | ATTR_MTIME \
  84         | ATTR_CTIME \
  85         | ATTR_ATIME_SET \
  86         | ATTR_MTIME_SET)
  87
  88 struct nfs4_opendata;
  89 static int _nfs4_proc_open(struct nfs4_opendata *data);
  90 static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
  91 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  92 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
  93 static int nfs4_proc_getattr(struct nfs_server *, struct nfs_fh *, struct nfs_fattr *, struct nfs4_label *label);
  94 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr, struct nfs4_label *label);
  95 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
  96                             struct nfs_fattr *fattr, struct iattr *sattr,
  97                             struct nfs4_state *state, struct nfs4_label *ilabel,
  98                             struct nfs4_label *olabel);
  99 #ifdef CONFIG_NFS_V4_1
 100 static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
 101                 struct rpc_cred *);
 102 static int nfs41_free_stateid(struct nfs_server *, nfs4_stateid *,
 103                 struct rpc_cred *);
 104 #endif
 105
 106 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 107 static inline struct nfs4_label *
 108 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 109         struct iattr *sattr, struct nfs4_label *label)
 110 {
 111         int err;
 112
 113         if (label == NULL)
 114                 return NULL;
 115
 116         if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
 117                 return NULL;
 118
 119         err = security_dentry_init_security(dentry, sattr->ia_mode,
 120                                 &dentry->d_name, (void **)&label->label, &label->len);
 121         if (err == 0)
 122                 return label;
 123
 124         return NULL;
 125 }
 126 static inline void
 127 nfs4_label_release_security(struct nfs4_label *label)
 128 {
 129         if (label)
 130                 security_release_secctx(label->label, label->len);
 131 }
 132 static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 133 {
 134         if (label)
 135                 return server->attr_bitmask;
 136
 137         return server->attr_bitmask_nl;
 138 }
 139 #else
 140 static inline struct nfs4_label *
 141 nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
 142         struct iattr *sattr, struct nfs4_label *l)
 143 { return NULL; }
 144 static inline void
 145 nfs4_label_release_security(struct nfs4_label *label)
 146 { return; }
 147 static inline u32 *
 148 nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
 149 { return server->attr_bitmask; }
 150 #endif
 151
 152 /* Prevent leaks of NFSv4 errors into userland */
 153 static int nfs4_map_errors(int err)
 154 {
 155         if (err >= -1000)
 156                 return err;
 157         switch (err) {
 158         case -NFS4ERR_RESOURCE:
 159         case -NFS4ERR_LAYOUTTRYLATER:
 160         case -NFS4ERR_RECALLCONFLICT:
 161                 return -EREMOTEIO;
 162         case -NFS4ERR_WRONGSEC:
 163         case -NFS4ERR_WRONG_CRED:
 164                 return -EPERM;
 165         case -NFS4ERR_BADOWNER:
 166         case -NFS4ERR_BADNAME:
 167                 return -EINVAL;
 168         case -NFS4ERR_SHARE_DENIED:
 169                 return -EACCES;
 170         case -NFS4ERR_MINOR_VERS_MISMATCH:
 171                 return -EPROTONOSUPPORT;
 172         case -NFS4ERR_FILE_OPEN:
 173                 return -EBUSY;
 174         default:
 175                 dprintk("%s could not handle NFSv4 error %d\n",
 176                                 __func__, -err);
 177                 break;
 178         }
 179         return -EIO;
 180 }
 181
 182 /*
 183  * This is our standard bitmap for GETATTR requests.
 184  */
 185 const u32 nfs4_fattr_bitmap[3] = {
 186         FATTR4_WORD0_TYPE
 187         | FATTR4_WORD0_CHANGE
 188         | FATTR4_WORD0_SIZE
 189         | FATTR4_WORD0_FSID
 190         | FATTR4_WORD0_FILEID,
 191         FATTR4_WORD1_MODE
 192         | FATTR4_WORD1_NUMLINKS
 193         | FATTR4_WORD1_OWNER
 194         | FATTR4_WORD1_OWNER_GROUP
 195         | FATTR4_WORD1_RAWDEV
 196         | FATTR4_WORD1_SPACE_USED
 197         | FATTR4_WORD1_TIME_ACCESS
 198         | FATTR4_WORD1_TIME_METADATA
 199         | FATTR4_WORD1_TIME_MODIFY
 200         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 201 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 202         FATTR4_WORD2_SECURITY_LABEL
 203 #endif
 204 };
 205
 206 static const u32 nfs4_pnfs_open_bitmap[3] = {
 207         FATTR4_WORD0_TYPE
 208         | FATTR4_WORD0_CHANGE
 209         | FATTR4_WORD0_SIZE
 210         | FATTR4_WORD0_FSID
 211         | FATTR4_WORD0_FILEID,
 212         FATTR4_WORD1_MODE
 213         | FATTR4_WORD1_NUMLINKS
 214         | FATTR4_WORD1_OWNER
 215         | FATTR4_WORD1_OWNER_GROUP
 216         | FATTR4_WORD1_RAWDEV
 217         | FATTR4_WORD1_SPACE_USED
 218         | FATTR4_WORD1_TIME_ACCESS
 219         | FATTR4_WORD1_TIME_METADATA
 220         | FATTR4_WORD1_TIME_MODIFY,
 221         FATTR4_WORD2_MDSTHRESHOLD
 222 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
 223         | FATTR4_WORD2_SECURITY_LABEL
 224 #endif
 225 };
 226
 227 static const u32 nfs4_open_noattr_bitmap[3] = {
 228         FATTR4_WORD0_TYPE
 229         | FATTR4_WORD0_CHANGE
 230         | FATTR4_WORD0_FILEID,
 231 };
 232
 233 const u32 nfs4_statfs_bitmap[3] = {
 234         FATTR4_WORD0_FILES_AVAIL
 235         | FATTR4_WORD0_FILES_FREE
 236         | FATTR4_WORD0_FILES_TOTAL,
 237         FATTR4_WORD1_SPACE_AVAIL
 238         | FATTR4_WORD1_SPACE_FREE
 239         | FATTR4_WORD1_SPACE_TOTAL
 240 };
 241
 242 const u32 nfs4_pathconf_bitmap[3] = {
 243         FATTR4_WORD0_MAXLINK
 244         | FATTR4_WORD0_MAXNAME,
 245         0
 246 };
 247
 248 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 249                         | FATTR4_WORD0_MAXREAD
 250                         | FATTR4_WORD0_MAXWRITE
 251                         | FATTR4_WORD0_LEASE_TIME,
 252                         FATTR4_WORD1_TIME_DELTA
 253                         | FATTR4_WORD1_FS_LAYOUT_TYPES,
 254                         FATTR4_WORD2_LAYOUT_BLKSIZE
 255                         | FATTR4_WORD2_CLONE_BLKSIZE
 256 };
 257
 258 const u32 nfs4_fs_locations_bitmap[3] = {
 259         FATTR4_WORD0_TYPE
 260         | FATTR4_WORD0_CHANGE
 261         | FATTR4_WORD0_SIZE
 262         | FATTR4_WORD0_FSID
 263         | FATTR4_WORD0_FILEID
 264         | FATTR4_WORD0_FS_LOCATIONS,
 265         FATTR4_WORD1_MODE
 266         | FATTR4_WORD1_NUMLINKS
 267         | FATTR4_WORD1_OWNER
 268         | FATTR4_WORD1_OWNER_GROUP
 269         | FATTR4_WORD1_RAWDEV
 270         | FATTR4_WORD1_SPACE_USED
 271         | FATTR4_WORD1_TIME_ACCESS
 272         | FATTR4_WORD1_TIME_METADATA
 273         | FATTR4_WORD1_TIME_MODIFY
 274         | FATTR4_WORD1_MOUNTED_ON_FILEID,
 275 };
 276
 277 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 278                 struct nfs4_readdir_arg *readdir)
 279 {
 280         __be32 *start, *p;
 281
 282         if (cookie > 2) {
 283                 readdir->cookie = cookie;
 284                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 285                 return;
 286         }
 287
 288         readdir->cookie = 0;
 289         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 290         if (cookie == 2)
 291                 return;
 292
 293         /*
 294          * NFSv4 servers do not return entries for '.' and '..'
 295          * Therefore, we fake these entries here.  We let '.'
 296          * have cookie 0 and '..' have cookie 1.  Note that
 297          * when talking to the server, we always send cookie 0
 298          * instead of 1 or 2.
 299          */
 300         start = p = kmap_atomic(*readdir->pages);
 301
 302         if (cookie == 0) {
 303                 *p++ = xdr_one;                                  /* next */
 304                 *p++ = xdr_zero;                   /* cookie, first word */
 305                 *p++ = xdr_one;                   /* cookie, second word */
 306                 *p++ = xdr_one;                             /* entry len */
 307                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 308                 p++;
 309                 *p++ = xdr_one;                         /* bitmap length */
 310                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 311                 *p++ = htonl(8);              /* attribute buffer length */
 312                 p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
 313         }
 314
 315         *p++ = xdr_one;                                  /* next */
 316         *p++ = xdr_zero;                   /* cookie, first word */
 317         *p++ = xdr_two;                   /* cookie, second word */
 318         *p++ = xdr_two;                             /* entry len */
 319         memcpy(p, "..\0\0", 4);                         /* entry */
 320         p++;
 321         *p++ = xdr_one;                         /* bitmap length */
 322         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 323         *p++ = htonl(8);              /* attribute buffer length */
 324         p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
 325
 326         readdir->pgbase = (char *)p - (char *)start;
 327         readdir->count -= readdir->pgbase;
 328         kunmap_atomic(start);
 329 }
 330
 331 static long nfs4_update_delay(long *timeout)
 332 {
 333         long ret;
 334         if (!timeout)
 335                 return NFS4_POLL_RETRY_MAX;
 336         if (*timeout <= 0)
 337                 *timeout = NFS4_POLL_RETRY_MIN;
 338         if (*timeout > NFS4_POLL_RETRY_MAX)
 339                 *timeout = NFS4_POLL_RETRY_MAX;
 340         ret = *timeout;
 341         *timeout <<= 1;
 342         return ret;
 343 }
 344
 345 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 346 {
 347         int res = 0;
 348
 349         might_sleep();
 350
 351         freezable_schedule_timeout_killable_unsafe(
 352                 nfs4_update_delay(timeout));
 353         if (fatal_signal_pending(current))
 354                 res = -ERESTARTSYS;
 355         return res;
 356 }
 357
 358 /* This is the error handling routine for processes that are allowed
 359  * to sleep.
 360  */
 361 static int nfs4_do_handle_exception(struct nfs_server *server,
 362                 int errorcode, struct nfs4_exception *exception)
 363 {
 364         struct nfs_client *clp = server->nfs_client;
 365         struct nfs4_state *state = exception->state;
 366         const nfs4_stateid *stateid = exception->stateid;
 367         struct inode *inode = exception->inode;
 368         int ret = errorcode;
 369
 370         exception->delay = 0;
 371         exception->recovering = 0;
 372         exception->retry = 0;
 373         switch(errorcode) {
 374                 case 0:
 375                         return 0;
 376                 case -NFS4ERR_OPENMODE:
 377                 case -NFS4ERR_DELEG_REVOKED:
 378                 case -NFS4ERR_ADMIN_REVOKED:
 379                 case -NFS4ERR_BAD_STATEID:
 380                         if (inode) {
 381                                 int err;
 382
 383                                 err = nfs_async_inode_return_delegation(inode,
 384                                                 stateid);
 385                                 if (err == 0)
 386                                         goto wait_on_recovery;
 387                                 if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
 388                                         exception->retry = 1;
 389                                         break;
 390                                 }
 391                         }
 392                         if (state == NULL)
 393                                 break;
 394                         ret = nfs4_schedule_stateid_recovery(server, state);
 395                         if (ret < 0)
 396                                 break;
 397                         goto wait_on_recovery;
 398                 case -NFS4ERR_EXPIRED:
 399                         if (state != NULL) {
 400                                 ret = nfs4_schedule_stateid_recovery(server, state);
 401                                 if (ret < 0)
 402                                         break;
 403                         }
 404                 case -NFS4ERR_STALE_STATEID:
 405                 case -NFS4ERR_STALE_CLIENTID:
 406                         nfs4_schedule_lease_recovery(clp);
 407                         goto wait_on_recovery;
 408                 case -NFS4ERR_MOVED:
 409                         ret = nfs4_schedule_migration_recovery(server);
 410                         if (ret < 0)
 411                                 break;
 412                         goto wait_on_recovery;
 413                 case -NFS4ERR_LEASE_MOVED:
 414                         nfs4_schedule_lease_moved_recovery(clp);
 415                         goto wait_on_recovery;
 416 #if defined(CONFIG_NFS_V4_1)
 417                 case -NFS4ERR_BADSESSION:
 418                 case -NFS4ERR_BADSLOT:
 419                 case -NFS4ERR_BAD_HIGH_SLOT:
 420                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
 421                 case -NFS4ERR_DEADSESSION:
 422                 case -NFS4ERR_SEQ_FALSE_RETRY:
 423                 case -NFS4ERR_SEQ_MISORDERED:
 424                         dprintk("%s ERROR: %d Reset session\n", __func__,
 425                                 errorcode);
 426                         nfs4_schedule_session_recovery(clp->cl_session, errorcode);
 427                         goto wait_on_recovery;
 428 #endif /* defined(CONFIG_NFS_V4_1) */
 429                 case -NFS4ERR_FILE_OPEN:
 430                         if (exception->timeout > HZ) {
 431                                 /* We have retried a decent amount, time to
 432                                  * fail
 433                                  */
 434                                 ret = -EBUSY;
 435                                 break;
 436                         }
 437                 case -NFS4ERR_DELAY:
 438                         nfs_inc_server_stats(server, NFSIOS_DELAY);
 439                 case -NFS4ERR_GRACE:
 440                 case -NFS4ERR_LAYOUTTRYLATER:
 441                 case -NFS4ERR_RECALLCONFLICT:
 442                         exception->delay = 1;
 443                         return 0;
 444
 445                 case -NFS4ERR_RETRY_UNCACHED_REP:
 446                 case -NFS4ERR_OLD_STATEID:
 447                         exception->retry = 1;
 448                         break;
 449                 case -NFS4ERR_BADOWNER:
 450                         /* The following works around a Linux server bug! */
 451                 case -NFS4ERR_BADNAME:
 452                         if (server->caps & NFS_CAP_UIDGID_NOMAP) {
 453                                 server->caps &= ~NFS_CAP_UIDGID_NOMAP;
 454                                 exception->retry = 1;
 455                                 printk(KERN_WARNING "NFS: v4 server %s "
 456                                                 "does not accept raw "
 457                                                 "uid/gids. "
 458                                                 "Reenabling the idmapper.\n",
 459                                                 server->nfs_client->cl_hostname);
 460                         }
 461         }
 462         /* We failed to handle the error */
 463         return nfs4_map_errors(ret);
 464 wait_on_recovery:
 465         exception->recovering = 1;
 466         return 0;
 467 }
 468
 469 /* This is the error handling routine for processes that are allowed
 470  * to sleep.
 471  */
 472 int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 473 {
 474         struct nfs_client *clp = server->nfs_client;
 475         int ret;
 476
 477         ret = nfs4_do_handle_exception(server, errorcode, exception);
 478         if (exception->delay) {
 479                 ret = nfs4_delay(server->client, &exception->timeout);
 480                 goto out_retry;
 481         }
 482         if (exception->recovering) {
 483                 ret = nfs4_wait_clnt_recover(clp);
 484                 if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 485                         return -EIO;
 486                 goto out_retry;
 487         }
 488         return ret;
 489 out_retry:
 490         if (ret == 0)
 491                 exception->retry = 1;
 492         return ret;
 493 }
 494
 495 static int
 496 nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
 497                 int errorcode, struct nfs4_exception *exception)
 498 {
 499         struct nfs_client *clp = server->nfs_client;
 500         int ret;
 501
 502         ret = nfs4_do_handle_exception(server, errorcode, exception);
 503         if (exception->delay) {
 504                 rpc_delay(task, nfs4_update_delay(&exception->timeout));
 505                 goto out_retry;
 506         }
 507         if (exception->recovering) {
 508                 rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
 509                 if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
 510                         rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
 511                 goto out_retry;
 512         }
 513         if (test_bit(NFS_MIG_FAILED, &server->mig_status))
 514                 ret = -EIO;
 515         return ret;
 516 out_retry:
 517         if (ret == 0)
 518                 exception->retry = 1;
 519         return ret;
 520 }
 521
 522 static int
 523 nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
 524                         struct nfs4_state *state, long *timeout)
 525 {
 526         struct nfs4_exception exception = {
 527                 .state = state,
 528         };
 529
 530         if (task->tk_status >= 0)
 531                 return 0;
 532         if (timeout)
 533                 exception.timeout = *timeout;
 534         task->tk_status = nfs4_async_handle_exception(task, server,
 535                         task->tk_status,
 536                         &exception);
 537         if (exception.delay && timeout)
 538                 *timeout = exception.timeout;
 539         if (exception.retry)
 540                 return -EAGAIN;
 541         return 0;
 542 }
 543
 544 /*
 545  * Return 'true' if 'clp' is using an rpc_client that is integrity protected
 546  * or 'false' otherwise.
 547  */
 548 static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
 549 {
 550         rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
 551
 552         if (flavor == RPC_AUTH_GSS_KRB5I ||
 553             flavor == RPC_AUTH_GSS_KRB5P)
 554                 return true;
 555
 556         return false;
 557 }
 558
 559 static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
 560 {
 561         spin_lock(&clp->cl_lock);
 562         if (time_before(clp->cl_last_renewal,timestamp))
 563                 clp->cl_last_renewal = timestamp;
 564         spin_unlock(&clp->cl_lock);
 565 }
 566
 567 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 568 {
 569         struct nfs_client *clp = server->nfs_client;
 570
 571         if (!nfs4_has_session(clp))
 572                 do_renew_lease(clp, timestamp);
 573 }
 574
 575 struct nfs4_call_sync_data {
 576         const struct nfs_server *seq_server;
 577         struct nfs4_sequence_args *seq_args;
 578         struct nfs4_sequence_res *seq_res;
 579 };
 580
 581 void nfs4_init_sequence(struct nfs4_sequence_args *args,
 582                         struct nfs4_sequence_res *res, int cache_reply)
 583 {
 584         args->sa_slot = NULL;
 585         args->sa_cache_this = cache_reply;
 586         args->sa_privileged = 0;
 587
 588         res->sr_slot = NULL;
 589 }
 590
 591 static void nfs4_set_sequence_privileged(struct nfs4_sequence_args *args)
 592 {
 593         args->sa_privileged = 1;
 594 }
 595
 596 int nfs40_setup_sequence(struct nfs4_slot_table *tbl,
 597                          struct nfs4_sequence_args *args,
 598                          struct nfs4_sequence_res *res,
 599                          struct rpc_task *task)
 600 {
 601         struct nfs4_slot *slot;
 602
 603         /* slot already allocated? */
 604         if (res->sr_slot != NULL)
 605                 goto out_start;
 606
 607         spin_lock(&tbl->slot_tbl_lock);
 608         if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
 609                 goto out_sleep;
 610
 611         slot = nfs4_alloc_slot(tbl);
 612         if (IS_ERR(slot)) {
 613                 if (slot == ERR_PTR(-ENOMEM))
 614                         task->tk_timeout = HZ >> 2;
 615                 goto out_sleep;
 616         }
 617         spin_unlock(&tbl->slot_tbl_lock);
 618
 619         args->sa_slot = slot;
 620         res->sr_slot = slot;
 621
 622 out_start:
 623         rpc_call_start(task);
 624         return 0;
 625
 626 out_sleep:
 627         if (args->sa_privileged)
 628                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 629                                 NULL, RPC_PRIORITY_PRIVILEGED);
 630         else
 631                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 632         spin_unlock(&tbl->slot_tbl_lock);
 633         return -EAGAIN;
 634 }
 635 EXPORT_SYMBOL_GPL(nfs40_setup_sequence);
 636
 637 static int nfs40_sequence_done(struct rpc_task *task,
 638                                struct nfs4_sequence_res *res)
 639 {
 640         struct nfs4_slot *slot = res->sr_slot;
 641         struct nfs4_slot_table *tbl;
 642
 643         if (slot == NULL)
 644                 goto out;
 645
 646         tbl = slot->table;
 647         spin_lock(&tbl->slot_tbl_lock);
 648         if (!nfs41_wake_and_assign_slot(tbl, slot))
 649                 nfs4_free_slot(tbl, slot);
 650         spin_unlock(&tbl->slot_tbl_lock);
 651
 652         res->sr_slot = NULL;
 653 out:
 654         return 1;
 655 }
 656
 657 #if defined(CONFIG_NFS_V4_1)
 658
 659 static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
 660 {
 661         struct nfs4_session *session;
 662         struct nfs4_slot_table *tbl;
 663         struct nfs4_slot *slot = res->sr_slot;
 664         bool send_new_highest_used_slotid = false;
 665
 666         tbl = slot->table;
 667         session = tbl->session;
 668
 669         spin_lock(&tbl->slot_tbl_lock);
 670         /* Be nice to the server: try to ensure that the last transmitted
 671          * value for highest_user_slotid <= target_highest_slotid
 672          */
 673         if (tbl->highest_used_slotid > tbl->target_highest_slotid)
 674                 send_new_highest_used_slotid = true;
 675
 676         if (nfs41_wake_and_assign_slot(tbl, slot)) {
 677                 send_new_highest_used_slotid = false;
 678                 goto out_unlock;
 679         }
 680         nfs4_free_slot(tbl, slot);
 681
 682         if (tbl->highest_used_slotid != NFS4_NO_SLOT)
 683                 send_new_highest_used_slotid = false;
 684 out_unlock:
 685         spin_unlock(&tbl->slot_tbl_lock);
 686         res->sr_slot = NULL;
 687         if (send_new_highest_used_slotid)
 688                 nfs41_notify_server(session->clp);
 689 }
 690
 691 int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 692 {
 693         struct nfs4_session *session;
 694         struct nfs4_slot *slot = res->sr_slot;
 695         struct nfs_client *clp;
 696         bool interrupted = false;
 697         int ret = 1;
 698
 699         if (slot == NULL)
 700                 goto out_noaction;
 701         /* don't increment the sequence number if the task wasn't sent */
 702         if (!RPC_WAS_SENT(task))
 703                 goto out;
 704
 705         session = slot->table->session;
 706
 707         if (slot->interrupted) {
 708                 slot->interrupted = 0;
 709                 interrupted = true;
 710         }
 711
 712         trace_nfs4_sequence_done(session, res);
 713         /* Check the SEQUENCE operation status */
 714         switch (res->sr_status) {
 715         case 0:
 716                 /* Update the slot's sequence and clientid lease timer */
 717                 ++slot->seq_nr;
 718                 clp = session->clp;
 719                 do_renew_lease(clp, res->sr_timestamp);
 720                 /* Check sequence flags */
 721                 nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags);
 722                 nfs41_update_target_slotid(slot->table, slot, res);
 723                 break;
 724         case 1:
 725                 /*
 726                  * sr_status remains 1 if an RPC level error occurred.
 727                  * The server may or may not have processed the sequence
 728                  * operation..
 729                  * Mark the slot as having hosted an interrupted RPC call.
 730                  */
 731                 slot->interrupted = 1;
 732                 goto out;
 733         case -NFS4ERR_DELAY:
 734                 /* The server detected a resend of the RPC call and
 735                  * returned NFS4ERR_DELAY as per Section 2.10.6.2
 736                  * of RFC5661.
 737                  */
 738                 dprintk("%s: slot=%u seq=%u: Operation in progress\n",
 739                         __func__,
 740                         slot->slot_nr,
 741                         slot->seq_nr);
 742                 goto out_retry;
 743         case -NFS4ERR_BADSLOT:
 744                 /*
 745                  * The slot id we used was probably retired. Try again
 746                  * using a different slot id.
 747                  */
 748                 goto retry_nowait;
 749         case -NFS4ERR_SEQ_MISORDERED:
 750                 /*
 751                  * Was the last operation on this sequence interrupted?
 752                  * If so, retry after bumping the sequence number.
 753                  */
 754                 if (interrupted) {
 755                         ++slot->seq_nr;
 756                         goto retry_nowait;
 757                 }
 758                 /*
 759                  * Could this slot have been previously retired?
 760                  * If so, then the server may be expecting seq_nr = 1!
 761                  */
 762                 if (slot->seq_nr != 1) {
 763                         slot->seq_nr = 1;
 764                         goto retry_nowait;
 765                 }
 766                 break;
 767         case -NFS4ERR_SEQ_FALSE_RETRY:
 768                 ++slot->seq_nr;
 769                 goto retry_nowait;
 770         default:
 771                 /* Just update the slot sequence no. */
 772                 ++slot->seq_nr;
 773         }
 774 out:
 775         /* The session may be reset by one of the error handlers. */
 776         dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
 777         nfs41_sequence_free_slot(res);
 778 out_noaction:
 779         return ret;
 780 retry_nowait:
 781         if (rpc_restart_call_prepare(task)) {
 782                 task->tk_status = 0;
 783                 ret = 0;
 784         }
 785         goto out;
 786 out_retry:
 787         if (!rpc_restart_call(task))
 788                 goto out;
 789         rpc_delay(task, NFS4_POLL_RETRY_MAX);
 790         return 0;
 791 }
 792 EXPORT_SYMBOL_GPL(nfs41_sequence_done);
 793
 794 int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
 795 {
 796         if (res->sr_slot == NULL)
 797                 return 1;
 798         if (!res->sr_slot->table->session)
 799                 return nfs40_sequence_done(task, res);
 800         return nfs41_sequence_done(task, res);
 801 }
 802 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 803
 804 int nfs41_setup_sequence(struct nfs4_session *session,
 805                                 struct nfs4_sequence_args *args,
 806                                 struct nfs4_sequence_res *res,
 807                                 struct rpc_task *task)
 808 {
 809         struct nfs4_slot *slot;
 810         struct nfs4_slot_table *tbl;
 811
 812         dprintk("--> %s\n", __func__);
 813         /* slot already allocated? */
 814         if (res->sr_slot != NULL)
 815                 goto out_success;
 816
 817         tbl = &session->fc_slot_table;
 818
 819         task->tk_timeout = 0;
 820
 821         spin_lock(&tbl->slot_tbl_lock);
 822         if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state) &&
 823             !args->sa_privileged) {
 824                 /* The state manager will wait until the slot table is empty */
 825                 dprintk("%s session is draining\n", __func__);
 826                 goto out_sleep;
 827         }
 828
 829         slot = nfs4_alloc_slot(tbl);
 830         if (IS_ERR(slot)) {
 831                 /* If out of memory, try again in 1/4 second */
 832                 if (slot == ERR_PTR(-ENOMEM))
 833                         task->tk_timeout = HZ >> 2;
 834                 dprintk("<-- %s: no free slots\n", __func__);
 835                 goto out_sleep;
 836         }
 837         spin_unlock(&tbl->slot_tbl_lock);
 838
 839         args->sa_slot = slot;
 840
 841         dprintk("<-- %s slotid=%u seqid=%u\n", __func__,
 842                         slot->slot_nr, slot->seq_nr);
 843
 844         res->sr_slot = slot;
 845         res->sr_timestamp = jiffies;
 846         res->sr_status_flags = 0;
 847         /*
 848          * sr_status is only set in decode_sequence, and so will remain
 849          * set to 1 if an rpc level failure occurs.
 850          */
 851         res->sr_status = 1;
 852         trace_nfs4_setup_sequence(session, args);
 853 out_success:
 854         rpc_call_start(task);
 855         return 0;
 856 out_sleep:
 857         /* Privileged tasks are queued with top priority */
 858         if (args->sa_privileged)
 859                 rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
 860                                 NULL, RPC_PRIORITY_PRIVILEGED);
 861         else
 862                 rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
 863         spin_unlock(&tbl->slot_tbl_lock);
 864         return -EAGAIN;
 865 }
 866 EXPORT_SYMBOL_GPL(nfs41_setup_sequence);
 867
 868 static int nfs4_setup_sequence(const struct nfs_server *server,
 869                                struct nfs4_sequence_args *args,
 870                                struct nfs4_sequence_res *res,
 871                                struct rpc_task *task)
 872 {
 873         struct nfs4_session *session = nfs4_get_session(server);
 874         int ret = 0;
 875
 876         if (!session)
 877                 return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 878                                             args, res, task);
 879
 880         dprintk("--> %s clp %p session %p sr_slot %u\n",
 881                 __func__, session->clp, session, res->sr_slot ?
 882                         res->sr_slot->slot_nr : NFS4_NO_SLOT);
 883
 884         ret = nfs41_setup_sequence(session, args, res, task);
 885
 886         dprintk("<-- %s status=%d\n", __func__, ret);
 887         return ret;
 888 }
 889
 890 static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
 891 {
 892         struct nfs4_call_sync_data *data = calldata;
 893         struct nfs4_session *session = nfs4_get_session(data->seq_server);
 894
 895         dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
 896
 897         nfs41_setup_sequence(session, data->seq_args, data->seq_res, task);
 898 }
 899
 900 static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
 901 {
 902         struct nfs4_call_sync_data *data = calldata;
 903
 904         nfs41_sequence_done(task, data->seq_res);
 905 }
 906
 907 static const struct rpc_call_ops nfs41_call_sync_ops = {
 908         .rpc_call_prepare = nfs41_call_sync_prepare,
 909         .rpc_call_done = nfs41_call_sync_done,
 910 };
 911
 912 #else   /* !CONFIG_NFS_V4_1 */
 913
 914 static int nfs4_setup_sequence(const struct nfs_server *server,
 915                                struct nfs4_sequence_args *args,
 916                                struct nfs4_sequence_res *res,
 917                                struct rpc_task *task)
 918 {
 919         return nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
 920                                     args, res, task);
 921 }
 922
 923 int nfs4_sequence_done(struct rpc_task *task,
 924                        struct nfs4_sequence_res *res)
 925 {
 926         return nfs40_sequence_done(task, res);
 927 }
 928 EXPORT_SYMBOL_GPL(nfs4_sequence_done);
 929
 930 #endif  /* !CONFIG_NFS_V4_1 */
 931
 932 static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
 933 {
 934         struct nfs4_call_sync_data *data = calldata;
 935         nfs4_setup_sequence(data->seq_server,
 936                                 data->seq_args, data->seq_res, task);
 937 }
 938
 939 static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
 940 {
 941         struct nfs4_call_sync_data *data = calldata;
 942         nfs4_sequence_done(task, data->seq_res);
 943 }
 944
 945 static const struct rpc_call_ops nfs40_call_sync_ops = {
 946         .rpc_call_prepare = nfs40_call_sync_prepare,
 947         .rpc_call_done = nfs40_call_sync_done,
 948 };
 949
 950 static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
 951                                    struct nfs_server *server,
 952                                    struct rpc_message *msg,
 953                                    struct nfs4_sequence_args *args,
 954                                    struct nfs4_sequence_res *res)
 955 {
 956         int ret;
 957         struct rpc_task *task;
 958         struct nfs_client *clp = server->nfs_client;
 959         struct nfs4_call_sync_data data = {
 960                 .seq_server = server,
 961                 .seq_args = args,
 962                 .seq_res = res,
 963         };
 964         struct rpc_task_setup task_setup = {
 965                 .rpc_client = clnt,
 966                 .rpc_message = msg,
 967                 .callback_ops = clp->cl_mvops->call_sync_ops,
 968                 .callback_data = &data
 969         };
 970
 971         task = rpc_run_task(&task_setup);
 972         if (IS_ERR(task))
 973                 ret = PTR_ERR(task);
 974         else {
 975                 ret = task->tk_status;
 976                 rpc_put_task(task);
 977         }
 978         return ret;
 979 }
 980
 981 int nfs4_call_sync(struct rpc_clnt *clnt,
 982                    struct nfs_server *server,
 983                    struct rpc_message *msg,
 984                    struct nfs4_sequence_args *args,
 985                    struct nfs4_sequence_res *res,
 986                    int cache_reply)
 987 {
 988         nfs4_init_sequence(args, res, cache_reply);
 989         return nfs4_call_sync_sequence(clnt, server, msg, args, res);
 990 }
 991
 992 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 993 {
 994         struct nfs_inode *nfsi = NFS_I(dir);
 995
 996         spin_lock(&dir->i_lock);
 997         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
 998         if (!cinfo->atomic || cinfo->before != dir->i_version)
 999                 nfs_force_lookup_revalidate(dir);
1000         dir->i_version = cinfo->after;
1001         nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1002         nfs_fscache_invalidate(dir);
1003         spin_unlock(&dir->i_lock);
1004 }
1005
1006 struct nfs4_opendata {
1007         struct kref kref;
1008         struct nfs_openargs o_arg;
1009         struct nfs_openres o_res;
1010         struct nfs_open_confirmargs c_arg;
1011         struct nfs_open_confirmres c_res;
1012         struct nfs4_string owner_name;
1013         struct nfs4_string group_name;
1014         struct nfs4_label *a_label;
1015         struct nfs_fattr f_attr;
1016         struct nfs4_label *f_label;
1017         struct dentry *dir;
1018         struct dentry *dentry;
1019         struct nfs4_state_owner *owner;
1020         struct nfs4_state *state;
1021         struct iattr attrs;
1022         unsigned long timestamp;
1023         unsigned int rpc_done : 1;
1024         unsigned int file_created : 1;
1025         unsigned int is_recover : 1;
1026         int rpc_status;
1027         int cancelled;
1028 };
1029
1030 static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
1031                 int err, struct nfs4_exception *exception)
1032 {
1033         if (err != -EINVAL)
1034                 return false;
1035         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1036                 return false;
1037         server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
1038         exception->retry = 1;
1039         return true;
1040 }
1041
1042 static u32
1043 nfs4_map_atomic_open_share(struct nfs_server *server,
1044                 fmode_t fmode, int openflags)
1045 {
1046         u32 res = 0;
1047
1048         switch (fmode & (FMODE_READ | FMODE_WRITE)) {
1049         case FMODE_READ:
1050                 res = NFS4_SHARE_ACCESS_READ;
1051                 break;
1052         case FMODE_WRITE:
1053                 res = NFS4_SHARE_ACCESS_WRITE;
1054                 break;
1055         case FMODE_READ|FMODE_WRITE:
1056                 res = NFS4_SHARE_ACCESS_BOTH;
1057         }
1058         if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
1059                 goto out;
1060         /* Want no delegation if we're using O_DIRECT */
1061         if (openflags & O_DIRECT)
1062                 res |= NFS4_SHARE_WANT_NO_DELEG;
1063 out:
1064         return res;
1065 }
1066
1067 static enum open_claim_type4
1068 nfs4_map_atomic_open_claim(struct nfs_server *server,
1069                 enum open_claim_type4 claim)
1070 {
1071         if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
1072                 return claim;
1073         switch (claim) {
1074         default:
1075                 return claim;
1076         case NFS4_OPEN_CLAIM_FH:
1077                 return NFS4_OPEN_CLAIM_NULL;
1078         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1079                 return NFS4_OPEN_CLAIM_DELEGATE_CUR;
1080         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1081                 return NFS4_OPEN_CLAIM_DELEGATE_PREV;
1082         }
1083 }
1084
1085 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
1086 {
1087         p->o_res.f_attr = &p->f_attr;
1088         p->o_res.f_label = p->f_label;
1089         p->o_res.seqid = p->o_arg.seqid;
1090         p->c_res.seqid = p->c_arg.seqid;
1091         p->o_res.server = p->o_arg.server;
1092         p->o_res.access_request = p->o_arg.access;
1093         nfs_fattr_init(&p->f_attr);
1094         nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
1095 }
1096
1097 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
1098                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
1099                 const struct iattr *attrs,
1100                 struct nfs4_label *label,
1101                 enum open_claim_type4 claim,
1102                 gfp_t gfp_mask)
1103 {
1104         struct dentry *parent = dget_parent(dentry);
1105         struct inode *dir = d_inode(parent);
1106         struct nfs_server *server = NFS_SERVER(dir);
1107         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
1108         struct nfs4_opendata *p;
1109
1110         p = kzalloc(sizeof(*p), gfp_mask);
1111         if (p == NULL)
1112                 goto err;
1113
1114         p->f_label = nfs4_label_alloc(server, gfp_mask);
1115         if (IS_ERR(p->f_label))
1116                 goto err_free_p;
1117
1118         p->a_label = nfs4_label_alloc(server, gfp_mask);
1119         if (IS_ERR(p->a_label))
1120                 goto err_free_f;
1121
1122         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
1123         p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
1124         if (IS_ERR(p->o_arg.seqid))
1125                 goto err_free_label;
1126         nfs_sb_active(dentry->d_sb);
1127         p->dentry = dget(dentry);
1128         p->dir = parent;
1129         p->owner = sp;
1130         atomic_inc(&sp->so_count);
1131         p->o_arg.open_flags = flags;
1132         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
1133         p->o_arg.share_access = nfs4_map_atomic_open_share(server,
1134                         fmode, flags);
1135         /* don't put an ACCESS op in OPEN compound if O_EXCL, because ACCESS
1136          * will return permission denied for all bits until close */
1137         if (!(flags & O_EXCL)) {
1138                 /* ask server to check for all possible rights as results
1139                  * are cached */
1140                 p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
1141                                   NFS4_ACCESS_EXTEND | NFS4_ACCESS_EXECUTE;
1142         }
1143         p->o_arg.clientid = server->nfs_client->cl_clientid;
1144         p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
1145         p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
1146         p->o_arg.name = &dentry->d_name;
1147         p->o_arg.server = server;
1148         p->o_arg.bitmask = nfs4_bitmask(server, label);
1149         p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
1150         p->o_arg.label = nfs4_label_copy(p->a_label, label);
1151         p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
1152         switch (p->o_arg.claim) {
1153         case NFS4_OPEN_CLAIM_NULL:
1154         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1155         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
1156                 p->o_arg.fh = NFS_FH(dir);
1157                 break;
1158         case NFS4_OPEN_CLAIM_PREVIOUS:
1159         case NFS4_OPEN_CLAIM_FH:
1160         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1161         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
1162                 p->o_arg.fh = NFS_FH(d_inode(dentry));
1163         }
1164         if (attrs != NULL && attrs->ia_valid != 0) {
1165                 __u32 verf[2];
1166
1167                 p->o_arg.u.attrs = &p->attrs;
1168                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
1169
1170                 verf[0] = jiffies;
1171                 verf[1] = current->pid;
1172                 memcpy(p->o_arg.u.verifier.data, verf,
1173                                 sizeof(p->o_arg.u.verifier.data));
1174         }
1175         p->c_arg.fh = &p->o_res.fh;
1176         p->c_arg.stateid = &p->o_res.stateid;
1177         p->c_arg.seqid = p->o_arg.seqid;
1178         nfs4_init_opendata_res(p);
1179         kref_init(&p->kref);
1180         return p;
1181
1182 err_free_label:
1183         nfs4_label_free(p->a_label);
1184 err_free_f:
1185         nfs4_label_free(p->f_label);
1186 err_free_p:
1187         kfree(p);
1188 err:
1189         dput(parent);
1190         return NULL;
1191 }
1192
1193 static void nfs4_opendata_free(struct kref *kref)
1194 {
1195         struct nfs4_opendata *p = container_of(kref,
1196                         struct nfs4_opendata, kref);
1197         struct super_block *sb = p->dentry->d_sb;
1198
1199         nfs_free_seqid(p->o_arg.seqid);
1200         if (p->state != NULL)
1201                 nfs4_put_open_state(p->state);
1202         nfs4_put_state_owner(p->owner);
1203
1204         nfs4_label_free(p->a_label);
1205         nfs4_label_free(p->f_label);
1206
1207         dput(p->dir);
1208         dput(p->dentry);
1209         nfs_sb_deactive(sb);
1210         nfs_fattr_free_names(&p->f_attr);
1211         kfree(p->f_attr.mdsthreshold);
1212         kfree(p);
1213 }
1214
1215 static void nfs4_opendata_put(struct nfs4_opendata *p)
1216 {
1217         if (p != NULL)
1218                 kref_put(&p->kref, nfs4_opendata_free);
1219 }
1220
1221 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
1222 {
1223         int ret;
1224
1225         ret = rpc_wait_for_completion_task(task);
1226         return ret;
1227 }
1228
1229 static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
1230                 fmode_t fmode)
1231 {
1232         switch(fmode & (FMODE_READ|FMODE_WRITE)) {
1233         case FMODE_READ|FMODE_WRITE:
1234                 return state->n_rdwr != 0;
1235         case FMODE_WRITE:
1236                 return state->n_wronly != 0;
1237         case FMODE_READ:
1238                 return state->n_rdonly != 0;
1239         }
1240         WARN_ON_ONCE(1);
1241         return false;
1242 }
1243
1244 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
1245 {
1246         int ret = 0;
1247
1248         if (open_mode & (O_EXCL|O_TRUNC))
1249                 goto out;
1250         switch (mode & (FMODE_READ|FMODE_WRITE)) {
1251                 case FMODE_READ:
1252                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
1253                                 && state->n_rdonly != 0;
1254                         break;
1255                 case FMODE_WRITE:
1256                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
1257                                 && state->n_wronly != 0;
1258                         break;
1259                 case FMODE_READ|FMODE_WRITE:
1260                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
1261                                 && state->n_rdwr != 0;
1262         }
1263 out:
1264         return ret;
1265 }
1266
1267 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
1268                 enum open_claim_type4 claim)
1269 {
1270         if (delegation == NULL)
1271                 return 0;
1272         if ((delegation->type & fmode) != fmode)
1273                 return 0;
1274         if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
1275                 return 0;
1276         switch (claim) {
1277         case NFS4_OPEN_CLAIM_NULL:
1278         case NFS4_OPEN_CLAIM_FH:
1279                 break;
1280         case NFS4_OPEN_CLAIM_PREVIOUS:
1281                 if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
1282                         break;
1283         default:
1284                 return 0;
1285         }
1286         nfs_mark_delegation_referenced(delegation);
1287         return 1;
1288 }
1289
1290 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
1291 {
1292         switch (fmode) {
1293                 case FMODE_WRITE:
1294                         state->n_wronly++;
1295                         break;
1296                 case FMODE_READ:
1297                         state->n_rdonly++;
1298                         break;
1299                 case FMODE_READ|FMODE_WRITE:
1300                         state->n_rdwr++;
1301         }
1302         nfs4_state_set_mode_locked(state, state->state | fmode);
1303 }
1304
1305 static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
1306 {
1307         struct nfs_client *clp = state->owner->so_server->nfs_client;
1308         bool need_recover = false;
1309
1310         if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
1311                 need_recover = true;
1312         if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
1313                 need_recover = true;
1314         if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
1315                 need_recover = true;
1316         if (need_recover)
1317                 nfs4_state_mark_reclaim_nograce(clp, state);
1318 }
1319
1320 static bool nfs_need_update_open_stateid(struct nfs4_state *state,
1321                 nfs4_stateid *stateid)
1322 {
1323         if (test_and_set_bit(NFS_OPEN_STATE, &state->flags) == 0)
1324                 return true;
1325         if (!nfs4_stateid_match_other(stateid, &state->open_stateid)) {
1326                 nfs_test_and_clear_all_open_stateid(state);
1327                 return true;
1328         }
1329         if (nfs4_stateid_is_newer(stateid, &state->open_stateid))
1330                 return true;
1331         return false;
1332 }
1333
1334 static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
1335 {
1336         if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
1337                 return;
1338         if (state->n_wronly)
1339                 set_bit(NFS_O_WRONLY_STATE, &state->flags);
1340         if (state->n_rdonly)
1341                 set_bit(NFS_O_RDONLY_STATE, &state->flags);
1342         if (state->n_rdwr)
1343                 set_bit(NFS_O_RDWR_STATE, &state->flags);
1344         set_bit(NFS_OPEN_STATE, &state->flags);
1345 }
1346
1347 static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
1348                 nfs4_stateid *arg_stateid,
1349                 nfs4_stateid *stateid, fmode_t fmode)
1350 {
1351         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1352         switch (fmode & (FMODE_READ|FMODE_WRITE)) {
1353         case FMODE_WRITE:
1354                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1355                 break;
1356         case FMODE_READ:
1357                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1358                 break;
1359         case 0:
1360                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1361                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1362                 clear_bit(NFS_OPEN_STATE, &state->flags);
1363         }
1364         if (stateid == NULL)
1365                 return;
1366         /* Handle races with OPEN */
1367         if (!nfs4_stateid_match_other(arg_stateid, &state->open_stateid) ||
1368             (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
1369             !nfs4_stateid_is_newer(stateid, &state->open_stateid))) {
1370                 nfs_resync_open_stateid_locked(state);
1371                 return;
1372         }
1373         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1374                 nfs4_stateid_copy(&state->stateid, stateid);
1375         nfs4_stateid_copy(&state->open_stateid, stateid);
1376 }
1377
1378 static void nfs_clear_open_stateid(struct nfs4_state *state,
1379         nfs4_stateid *arg_stateid,
1380         nfs4_stateid *stateid, fmode_t fmode)
1381 {
1382         write_seqlock(&state->seqlock);
1383         nfs_clear_open_stateid_locked(state, arg_stateid, stateid, fmode);
1384         write_sequnlock(&state->seqlock);
1385         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1386                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1387 }
1388
1389 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
1390 {
1391         switch (fmode) {
1392                 case FMODE_READ:
1393                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
1394                         break;
1395                 case FMODE_WRITE:
1396                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
1397                         break;
1398                 case FMODE_READ|FMODE_WRITE:
1399                         set_bit(NFS_O_RDWR_STATE, &state->flags);
1400         }
1401         if (!nfs_need_update_open_stateid(state, stateid))
1402                 return;
1403         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1404                 nfs4_stateid_copy(&state->stateid, stateid);
1405         nfs4_stateid_copy(&state->open_stateid, stateid);
1406 }
1407
1408 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
1409 {
1410         /*
1411          * Protect the call to nfs4_state_set_mode_locked and
1412          * serialise the stateid update
1413          */
1414         spin_lock(&state->owner->so_lock);
1415         write_seqlock(&state->seqlock);
1416         if (deleg_stateid != NULL) {
1417                 nfs4_stateid_copy(&state->stateid, deleg_stateid);
1418                 set_bit(NFS_DELEGATED_STATE, &state->flags);
1419         }
1420         if (open_stateid != NULL)
1421                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
1422         write_sequnlock(&state->seqlock);
1423         update_open_stateflags(state, fmode);
1424         spin_unlock(&state->owner->so_lock);
1425 }
1426
1427 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
1428 {
1429         struct nfs_inode *nfsi = NFS_I(state->inode);
1430         struct nfs_delegation *deleg_cur;
1431         int ret = 0;
1432
1433         fmode &= (FMODE_READ|FMODE_WRITE);
1434
1435         rcu_read_lock();
1436         deleg_cur = rcu_dereference(nfsi->delegation);
1437         if (deleg_cur == NULL)
1438                 goto no_delegation;
1439
1440         spin_lock(&deleg_cur->lock);
1441         if (rcu_dereference(nfsi->delegation) != deleg_cur ||
1442            test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
1443             (deleg_cur->type & fmode) != fmode)
1444                 goto no_delegation_unlock;
1445
1446         if (delegation == NULL)
1447                 delegation = &deleg_cur->stateid;
1448         else if (!nfs4_stateid_match(&deleg_cur->stateid, delegation))
1449                 goto no_delegation_unlock;
1450
1451         nfs_mark_delegation_referenced(deleg_cur);
1452         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
1453         ret = 1;
1454 no_delegation_unlock:
1455         spin_unlock(&deleg_cur->lock);
1456 no_delegation:
1457         rcu_read_unlock();
1458
1459         if (!ret && open_stateid != NULL) {
1460                 __update_open_stateid(state, open_stateid, NULL, fmode);
1461                 ret = 1;
1462         }
1463         if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
1464                 nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
1465
1466         return ret;
1467 }
1468
1469 static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
1470                 const nfs4_stateid *stateid)
1471 {
1472         struct nfs4_state *state = lsp->ls_state;
1473         bool ret = false;
1474
1475         spin_lock(&state->state_lock);
1476         if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
1477                 goto out_noupdate;
1478         if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
1479                 goto out_noupdate;
1480         nfs4_stateid_copy(&lsp->ls_stateid, stateid);
1481         ret = true;
1482 out_noupdate:
1483         spin_unlock(&state->state_lock);
1484         return ret;
1485 }
1486
1487 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
1488 {
1489         struct nfs_delegation *delegation;
1490
1491         rcu_read_lock();
1492         delegation = rcu_dereference(NFS_I(inode)->delegation);
1493         if (delegation == NULL || (delegation->type & fmode) == fmode) {
1494                 rcu_read_unlock();
1495                 return;
1496         }
1497         rcu_read_unlock();
1498         nfs4_inode_return_delegation(inode);
1499 }
1500
1501 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
1502 {
1503         struct nfs4_state *state = opendata->state;
1504         struct nfs_inode *nfsi = NFS_I(state->inode);
1505         struct nfs_delegation *delegation;
1506         int open_mode = opendata->o_arg.open_flags;
1507         fmode_t fmode = opendata->o_arg.fmode;
1508         enum open_claim_type4 claim = opendata->o_arg.claim;
1509         nfs4_stateid stateid;
1510         int ret = -EAGAIN;
1511
1512         for (;;) {
1513                 spin_lock(&state->owner->so_lock);
1514                 if (can_open_cached(state, fmode, open_mode)) {
1515                         update_open_stateflags(state, fmode);
1516                         spin_unlock(&state->owner->so_lock);
1517                         goto out_return_state;
1518                 }
1519                 spin_unlock(&state->owner->so_lock);
1520                 rcu_read_lock();
1521                 delegation = rcu_dereference(nfsi->delegation);
1522                 if (!can_open_delegated(delegation, fmode, claim)) {
1523                         rcu_read_unlock();
1524                         break;
1525                 }
1526                 /* Save the delegation */
1527                 nfs4_stateid_copy(&stateid, &delegation->stateid);
1528                 rcu_read_unlock();
1529                 nfs_release_seqid(opendata->o_arg.seqid);
1530                 if (!opendata->is_recover) {
1531                         ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
1532                         if (ret != 0)
1533                                 goto out;
1534                 }
1535                 ret = -EAGAIN;
1536
1537                 /* Try to update the stateid using the delegation */
1538                 if (update_open_stateid(state, NULL, &stateid, fmode))
1539                         goto out_return_state;
1540         }
1541 out:
1542         return ERR_PTR(ret);
1543 out_return_state:
1544         atomic_inc(&state->count);
1545         return state;
1546 }
1547
1548 static void
1549 nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
1550 {
1551         struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
1552         struct nfs_delegation *delegation;
1553         int delegation_flags = 0;
1554
1555         rcu_read_lock();
1556         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1557         if (delegation)
1558                 delegation_flags = delegation->flags;
1559         rcu_read_unlock();
1560         switch (data->o_arg.claim) {
1561         default:
1562                 break;
1563         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
1564         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
1565                 pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
1566                                    "returning a delegation for "
1567                                    "OPEN(CLAIM_DELEGATE_CUR)\n",
1568                                    clp->cl_hostname);
1569                 return;
1570         }
1571         if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
1572                 nfs_inode_set_delegation(state->inode,
1573                                          data->owner->so_cred,
1574                                          &data->o_res);
1575         else
1576                 nfs_inode_reclaim_delegation(state->inode,
1577                                              data->owner->so_cred,
1578                                              &data->o_res);
1579 }
1580
1581 /*
1582  * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
1583  * and update the nfs4_state.
1584  */
1585 static struct nfs4_state *
1586 _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
1587 {
1588         struct inode *inode = data->state->inode;
1589         struct nfs4_state *state = data->state;
1590         int ret;
1591
1592         if (!data->rpc_done) {
1593                 if (data->rpc_status) {
1594                         ret = data->rpc_status;
1595                         goto err;
1596                 }
1597                 /* cached opens have already been processed */
1598                 goto update;
1599         }
1600
1601         ret = nfs_refresh_inode(inode, &data->f_attr);
1602         if (ret)
1603                 goto err;
1604
1605         if (data->o_res.delegation_type != 0)
1606                 nfs4_opendata_check_deleg(data, state);
1607 update:
1608         update_open_stateid(state, &data->o_res.stateid, NULL,
1609                             data->o_arg.fmode);
1610         atomic_inc(&state->count);
1611
1612         return state;
1613 err:
1614         return ERR_PTR(ret);
1615
1616 }
1617
1618 static struct nfs4_state *
1619 _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1620 {
1621         struct inode *inode;
1622         struct nfs4_state *state = NULL;
1623         int ret;
1624
1625         if (!data->rpc_done) {
1626                 state = nfs4_try_open_cached(data);
1627                 trace_nfs4_cached_open(data->state);
1628                 goto out;
1629         }
1630
1631         ret = -EAGAIN;
1632         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
1633                 goto err;
1634         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
1635         ret = PTR_ERR(inode);
1636         if (IS_ERR(inode))
1637                 goto err;
1638         ret = -ENOMEM;
1639         state = nfs4_get_open_state(inode, data->owner);
1640         if (state == NULL)
1641                 goto err_put_inode;
1642         if (data->o_res.delegation_type != 0)
1643                 nfs4_opendata_check_deleg(data, state);
1644         update_open_stateid(state, &data->o_res.stateid, NULL,
1645                         data->o_arg.fmode);
1646         iput(inode);
1647 out:
1648         nfs_release_seqid(data->o_arg.seqid);
1649         return state;
1650 err_put_inode:
1651         iput(inode);
1652 err:
1653         return ERR_PTR(ret);
1654 }
1655
1656 static struct nfs4_state *
1657 nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
1658 {
1659         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
1660                 return _nfs4_opendata_reclaim_to_nfs4_state(data);
1661         return _nfs4_opendata_to_nfs4_state(data);
1662 }
1663
1664 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
1665 {
1666         struct nfs_inode *nfsi = NFS_I(state->inode);
1667         struct nfs_open_context *ctx;
1668
1669         spin_lock(&state->inode->i_lock);
1670         list_for_each_entry(ctx, &nfsi->open_files, list) {
1671                 if (ctx->state != state)
1672                         continue;
1673                 get_nfs_open_context(ctx);
1674                 spin_unlock(&state->inode->i_lock);
1675                 return ctx;
1676         }
1677         spin_unlock(&state->inode->i_lock);
1678         return ERR_PTR(-ENOENT);
1679 }
1680
1681 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
1682                 struct nfs4_state *state, enum open_claim_type4 claim)
1683 {
1684         struct nfs4_opendata *opendata;
1685
1686         opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
1687                         NULL, NULL, claim, GFP_NOFS);
1688         if (opendata == NULL)
1689                 return ERR_PTR(-ENOMEM);
1690         opendata->state = state;
1691         atomic_inc(&state->count);
1692         return opendata;
1693 }
1694
1695 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
1696                 fmode_t fmode)
1697 {
1698         struct nfs4_state *newstate;
1699         int ret;
1700
1701         if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
1702                 return 0;
1703         opendata->o_arg.open_flags = 0;
1704         opendata->o_arg.fmode = fmode;
1705         opendata->o_arg.share_access = nfs4_map_atomic_open_share(
1706                         NFS_SB(opendata->dentry->d_sb),
1707                         fmode, 0);
1708         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
1709         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
1710         nfs4_init_opendata_res(opendata);
1711         ret = _nfs4_recover_proc_open(opendata);
1712         if (ret != 0)
1713                 return ret;
1714         newstate = nfs4_opendata_to_nfs4_state(opendata);
1715         if (IS_ERR(newstate))
1716                 return PTR_ERR(newstate);
1717         if (newstate != opendata->state)
1718                 ret = -ESTALE;
1719         nfs4_close_state(newstate, fmode);
1720         return ret;
1721 }
1722
1723 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
1724 {
1725         int ret;
1726
1727         /* Don't trigger recovery in nfs_test_and_clear_all_open_stateid */
1728         clear_bit(NFS_O_RDWR_STATE, &state->flags);
1729         clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1730         clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1731         /* memory barrier prior to reading state->n_* */
1732         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1733         clear_bit(NFS_OPEN_STATE, &state->flags);
1734         smp_rmb();
1735         ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1736         if (ret != 0)
1737                 return ret;
1738         ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1739         if (ret != 0)
1740                 return ret;
1741         ret = nfs4_open_recover_helper(opendata, FMODE_READ);
1742         if (ret != 0)
1743                 return ret;
1744         /*
1745          * We may have performed cached opens for all three recoveries.
1746          * Check if we need to update the current stateid.
1747          */
1748         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
1749             !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
1750                 write_seqlock(&state->seqlock);
1751                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
1752                         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1753                 write_sequnlock(&state->seqlock);
1754         }
1755         return 0;
1756 }
1757
1758 /*
1759  * OPEN_RECLAIM:
1760  *      reclaim state on the server after a reboot.
1761  */
1762 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1763 {
1764         struct nfs_delegation *delegation;
1765         struct nfs4_opendata *opendata;
1766         fmode_t delegation_type = 0;
1767         int status;
1768
1769         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1770                         NFS4_OPEN_CLAIM_PREVIOUS);
1771         if (IS_ERR(opendata))
1772                 return PTR_ERR(opendata);
1773         rcu_read_lock();
1774         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
1775         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
1776                 delegation_type = delegation->type;
1777         rcu_read_unlock();
1778         opendata->o_arg.u.delegation_type = delegation_type;
1779         status = nfs4_open_recover(opendata, state);
1780         nfs4_opendata_put(opendata);
1781         return status;
1782 }
1783
1784 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
1785 {
1786         struct nfs_server *server = NFS_SERVER(state->inode);
1787         struct nfs4_exception exception = { };
1788         int err;
1789         do {
1790                 err = _nfs4_do_open_reclaim(ctx, state);
1791                 trace_nfs4_open_reclaim(ctx, 0, err);
1792                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
1793                         continue;
1794                 if (err != -NFS4ERR_DELAY)
1795                         break;
1796                 nfs4_handle_exception(server, err, &exception);
1797         } while (exception.retry);
1798         return err;
1799 }
1800
1801 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
1802 {
1803         struct nfs_open_context *ctx;
1804         int ret;
1805
1806         ctx = nfs4_state_find_open_context(state);
1807         if (IS_ERR(ctx))
1808                 return -EAGAIN;
1809         ret = nfs4_do_open_reclaim(ctx, state);
1810         put_nfs_open_context(ctx);
1811         return ret;
1812 }
1813
1814 static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, int err)
1815 {
1816         switch (err) {
1817                 default:
1818                         printk(KERN_ERR "NFS: %s: unhandled error "
1819                                         "%d.\n", __func__, err);
1820                 case 0:
1821                 case -ENOENT:
1822                 case -EAGAIN:
1823                 case -ESTALE:
1824                         break;
1825                 case -NFS4ERR_BADSESSION:
1826                 case -NFS4ERR_BADSLOT:
1827                 case -NFS4ERR_BAD_HIGH_SLOT:
1828                 case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
1829                 case -NFS4ERR_DEADSESSION:
1830                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1831                         nfs4_schedule_session_recovery(server->nfs_client->cl_session, err);
1832                         return -EAGAIN;
1833                 case -NFS4ERR_STALE_CLIENTID:
1834                 case -NFS4ERR_STALE_STATEID:
1835                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1836                 case -NFS4ERR_EXPIRED:
1837                         /* Don't recall a delegation if it was lost */
1838                         nfs4_schedule_lease_recovery(server->nfs_client);
1839                         return -EAGAIN;
1840                 case -NFS4ERR_MOVED:
1841                         nfs4_schedule_migration_recovery(server);
1842                         return -EAGAIN;
1843                 case -NFS4ERR_LEASE_MOVED:
1844                         nfs4_schedule_lease_moved_recovery(server->nfs_client);
1845                         return -EAGAIN;
1846                 case -NFS4ERR_DELEG_REVOKED:
1847                 case -NFS4ERR_ADMIN_REVOKED:
1848                 case -NFS4ERR_BAD_STATEID:
1849                 case -NFS4ERR_OPENMODE:
1850                         nfs_inode_find_state_and_recover(state->inode,
1851                                         stateid);
1852                         nfs4_schedule_stateid_recovery(server, state);
1853                         return -EAGAIN;
1854                 case -NFS4ERR_DELAY:
1855                 case -NFS4ERR_GRACE:
1856                         set_bit(NFS_DELEGATED_STATE, &state->flags);
1857                         ssleep(1);
1858                         return -EAGAIN;
1859                 case -ENOMEM:
1860                 case -NFS4ERR_DENIED:
1861                         /* kill_proc(fl->fl_pid, SIGLOST, 1); */
1862                         return 0;
1863         }
1864         return err;
1865 }
1866
1867 int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
1868                 struct nfs4_state *state, const nfs4_stateid *stateid,
1869                 fmode_t type)
1870 {
1871         struct nfs_server *server = NFS_SERVER(state->inode);
1872         struct nfs4_opendata *opendata;
1873         int err = 0;
1874
1875         opendata = nfs4_open_recoverdata_alloc(ctx, state,
1876                         NFS4_OPEN_CLAIM_DELEG_CUR_FH);
1877         if (IS_ERR(opendata))
1878                 return PTR_ERR(opendata);
1879         nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
1880         write_seqlock(&state->seqlock);
1881         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
1882         write_sequnlock(&state->seqlock);
1883         clear_bit(NFS_DELEGATED_STATE, &state->flags);
1884         switch (type & (FMODE_READ|FMODE_WRITE)) {
1885         case FMODE_READ|FMODE_WRITE:
1886         case FMODE_WRITE:
1887                 err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
1888                 if (err)
1889                         break;
1890                 err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
1891                 if (err)
1892                         break;
1893         case FMODE_READ:
1894                 err = nfs4_open_recover_helper(opendata, FMODE_READ);
1895         }
1896         nfs4_opendata_put(opendata);
1897         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
1898 }
1899
1900 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
1901 {
1902         struct nfs4_opendata *data = calldata;
1903
1904         nfs40_setup_sequence(data->o_arg.server->nfs_client->cl_slot_tbl,
1905                              &data->c_arg.seq_args, &data->c_res.seq_res, task);
1906 }
1907
1908 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
1909 {
1910         struct nfs4_opendata *data = calldata;
1911
1912         nfs40_sequence_done(task, &data->c_res.seq_res);
1913
1914         data->rpc_status = task->tk_status;
1915         if (data->rpc_status == 0) {
1916                 nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
1917                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
1918                 renew_lease(data->o_res.server, data->timestamp);
1919                 data->rpc_done = 1;
1920         }
1921 }
1922
1923 static void nfs4_open_confirm_release(void *calldata)
1924 {
1925         struct nfs4_opendata *data = calldata;
1926         struct nfs4_state *state = NULL;
1927
1928         /* If this request hasn't been cancelled, do nothing */
1929         if (data->cancelled == 0)
1930                 goto out_free;
1931         /* In case of error, no cleanup! */
1932         if (!data->rpc_done)
1933                 goto out_free;
1934         state = nfs4_opendata_to_nfs4_state(data);
1935         if (!IS_ERR(state))
1936                 nfs4_close_state(state, data->o_arg.fmode);
1937 out_free:
1938         nfs4_opendata_put(data);
1939 }
1940
1941 static const struct rpc_call_ops nfs4_open_confirm_ops = {
1942         .rpc_call_prepare = nfs4_open_confirm_prepare,
1943         .rpc_call_done = nfs4_open_confirm_done,
1944         .rpc_release = nfs4_open_confirm_release,
1945 };
1946
1947 /*
1948  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
1949  */
1950 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
1951 {
1952         struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
1953         struct rpc_task *task;
1954         struct  rpc_message msg = {
1955                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
1956                 .rpc_argp = &data->c_arg,
1957                 .rpc_resp = &data->c_res,
1958                 .rpc_cred = data->owner->so_cred,
1959         };
1960         struct rpc_task_setup task_setup_data = {
1961                 .rpc_client = server->client,
1962                 .rpc_message = &msg,
1963                 .callback_ops = &nfs4_open_confirm_ops,
1964                 .callback_data = data,
1965                 .workqueue = nfsiod_workqueue,
1966                 .flags = RPC_TASK_ASYNC,
1967         };
1968         int status;
1969
1970         nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1);
1971         kref_get(&data->kref);
1972         data->rpc_done = 0;
1973         data->rpc_status = 0;
1974         data->timestamp = jiffies;
1975         if (data->is_recover)
1976                 nfs4_set_sequence_privileged(&data->c_arg.seq_args);
1977         task = rpc_run_task(&task_setup_data);
1978         if (IS_ERR(task))
1979                 return PTR_ERR(task);
1980         status = nfs4_wait_for_completion_rpc_task(task);
1981         if (status != 0) {
1982                 data->cancelled = 1;
1983                 smp_wmb();
1984         } else
1985                 status = data->rpc_status;
1986         rpc_put_task(task);
1987         return status;
1988 }
1989
1990 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
1991 {
1992         struct nfs4_opendata *data = calldata;
1993         struct nfs4_state_owner *sp = data->owner;
1994         struct nfs_client *clp = sp->so_server->nfs_client;
1995         enum open_claim_type4 claim = data->o_arg.claim;
1996
1997         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
1998                 goto out_wait;
1999         /*
2000          * Check if we still need to send an OPEN call, or if we can use
2001          * a delegation instead.
2002          */
2003         if (data->state != NULL) {
2004                 struct nfs_delegation *delegation;
2005
2006                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
2007                         goto out_no_action;
2008                 rcu_read_lock();
2009                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
2010                 if (can_open_delegated(delegation, data->o_arg.fmode, claim))
2011                         goto unlock_no_action;
2012                 rcu_read_unlock();
2013         }
2014         /* Update client id. */
2015         data->o_arg.clientid = clp->cl_clientid;
2016         switch (claim) {
2017         default:
2018                 break;
2019         case NFS4_OPEN_CLAIM_PREVIOUS:
2020         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
2021         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
2022                 data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
2023         case NFS4_OPEN_CLAIM_FH:
2024                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
2025                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
2026         }
2027         data->timestamp = jiffies;
2028         if (nfs4_setup_sequence(data->o_arg.server,
2029                                 &data->o_arg.seq_args,
2030                                 &data->o_res.seq_res,
2031                                 task) != 0)
2032                 nfs_release_seqid(data->o_arg.seqid);
2033
2034         /* Set the create mode (note dependency on the session type) */
2035         data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
2036         if (data->o_arg.open_flags & O_EXCL) {
2037                 data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
2038                 if (nfs4_has_persistent_session(clp))
2039                         data->o_arg.createmode = NFS4_CREATE_GUARDED;
2040                 else if (clp->cl_mvops->minor_version > 0)
2041                         data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
2042         }
2043         return;
2044 unlock_no_action:
2045         trace_nfs4_cached_open(data->state);
2046         rcu_read_unlock();
2047 out_no_action:
2048         task->tk_action = NULL;
2049 out_wait:
2050         nfs4_sequence_done(task, &data->o_res.seq_res);
2051 }
2052
2053 static void nfs4_open_done(struct rpc_task *task, void *calldata)
2054 {
2055         struct nfs4_opendata *data = calldata;
2056
2057         data->rpc_status = task->tk_status;
2058
2059         if (!nfs4_sequence_done(task, &data->o_res.seq_res))
2060                 return;
2061
2062         if (task->tk_status == 0) {
2063                 if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
2064                         switch (data->o_res.f_attr->mode & S_IFMT) {
2065                         case S_IFREG:
2066                                 break;
2067                         case S_IFLNK:
2068                                 data->rpc_status = -ELOOP;
2069                                 break;
2070                         case S_IFDIR:
2071                                 data->rpc_status = -EISDIR;
2072                                 break;
2073                         default:
2074                                 data->rpc_status = -ENOTDIR;
2075                         }
2076                 }
2077                 renew_lease(data->o_res.server, data->timestamp);
2078                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
2079                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
2080         }
2081         data->rpc_done = 1;
2082 }
2083
2084 static void nfs4_open_release(void *calldata)
2085 {
2086         struct nfs4_opendata *data = calldata;
2087         struct nfs4_state *state = NULL;
2088
2089         /* If this request hasn't been cancelled, do nothing */
2090         if (data->cancelled == 0)
2091                 goto out_free;
2092         /* In case of error, no cleanup! */
2093         if (data->rpc_status != 0 || !data->rpc_done)
2094                 goto out_free;
2095         /* In case we need an open_confirm, no cleanup! */
2096         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
2097                 goto out_free;
2098         state = nfs4_opendata_to_nfs4_state(data);
2099         if (!IS_ERR(state))
2100                 nfs4_close_state(state, data->o_arg.fmode);
2101 out_free:
2102         nfs4_opendata_put(data);
2103 }
2104
2105 static const struct rpc_call_ops nfs4_open_ops = {
2106         .rpc_call_prepare = nfs4_open_prepare,
2107         .rpc_call_done = nfs4_open_done,
2108         .rpc_release = nfs4_open_release,
2109 };
2110
2111 static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
2112 {
2113         struct inode *dir = d_inode(data->dir);
2114         struct nfs_server *server = NFS_SERVER(dir);
2115         struct nfs_openargs *o_arg = &data->o_arg;
2116         struct nfs_openres *o_res = &data->o_res;
2117         struct rpc_task *task;
2118         struct rpc_message msg = {
2119                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
2120                 .rpc_argp = o_arg,
2121                 .rpc_resp = o_res,
2122                 .rpc_cred = data->owner->so_cred,
2123         };
2124         struct rpc_task_setup task_setup_data = {
2125                 .rpc_client = server->client,
2126                 .rpc_message = &msg,
2127                 .callback_ops = &nfs4_open_ops,
2128                 .callback_data = data,
2129                 .workqueue = nfsiod_workqueue,
2130                 .flags = RPC_TASK_ASYNC,
2131         };
2132         int status;
2133
2134         nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1);
2135         kref_get(&data->kref);
2136         data->rpc_done = 0;
2137         data->rpc_status = 0;
2138         data->cancelled = 0;
2139         data->is_recover = 0;
2140         if (isrecover) {
2141                 nfs4_set_sequence_privileged(&o_arg->seq_args);
2142                 data->is_recover = 1;
2143         }
2144         task = rpc_run_task(&task_setup_data);
2145         if (IS_ERR(task))
2146                 return PTR_ERR(task);
2147         status = nfs4_wait_for_completion_rpc_task(task);
2148         if (status != 0) {
2149                 data->cancelled = 1;
2150                 smp_wmb();
2151         } else
2152                 status = data->rpc_status;
2153         rpc_put_task(task);
2154
2155         return status;
2156 }
2157
2158 static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
2159 {
2160         struct inode *dir = d_inode(data->dir);
2161         struct nfs_openres *o_res = &data->o_res;
2162         int status;
2163
2164         status = nfs4_run_open_task(data, 1);
2165         if (status != 0 || !data->rpc_done)
2166                 return status;
2167
2168         nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
2169
2170         if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2171                 status = _nfs4_proc_open_confirm(data);
2172                 if (status != 0)
2173                         return status;
2174         }
2175
2176         return status;
2177 }
2178
2179 /*
2180  * Additional permission checks in order to distinguish between an
2181  * open for read, and an open for execute. This works around the
2182  * fact that NFSv4 OPEN treats read and execute permissions as being
2183  * the same.
2184  * Note that in the non-execute case, we want to turn off permission
2185  * checking if we just created a new file (POSIX open() semantics).
2186  */
2187 static int nfs4_opendata_access(struct rpc_cred *cred,
2188                                 struct nfs4_opendata *opendata,
2189                                 struct nfs4_state *state, fmode_t fmode,
2190                                 int openflags)
2191 {
2192         struct nfs_access_entry cache;
2193         u32 mask;
2194
2195         /* access call failed or for some reason the server doesn't
2196          * support any access modes -- defer access call until later */
2197         if (opendata->o_res.access_supported == 0)
2198                 return 0;
2199
2200         mask = 0;
2201         /*
2202          * Use openflags to check for exec, because fmode won't
2203          * always have FMODE_EXEC set when file open for exec.
2204          */
2205         if (openflags & __FMODE_EXEC) {
2206                 /* ONLY check for exec rights */
2207                 mask = MAY_EXEC;
2208         } else if ((fmode & FMODE_READ) && !opendata->file_created)
2209                 mask = MAY_READ;
2210
2211         cache.cred = cred;
2212         cache.jiffies = jiffies;
2213         nfs_access_set_mask(&cache, opendata->o_res.access_result);
2214         nfs_access_add_cache(state->inode, &cache);
2215
2216         if ((mask & ~cache.mask & (MAY_READ | MAY_EXEC)) == 0)
2217                 return 0;
2218
2219         /* even though OPEN succeeded, access is denied. Close the file */
2220         nfs4_close_state(state, fmode);
2221         return -EACCES;
2222 }
2223
2224 /*
2225  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
2226  */
2227 static int _nfs4_proc_open(struct nfs4_opendata *data)
2228 {
2229         struct inode *dir = d_inode(data->dir);
2230         struct nfs_server *server = NFS_SERVER(dir);
2231         struct nfs_openargs *o_arg = &data->o_arg;
2232         struct nfs_openres *o_res = &data->o_res;
2233         int status;
2234
2235         status = nfs4_run_open_task(data, 0);
2236         if (!data->rpc_done)
2237                 return status;
2238         if (status != 0) {
2239                 if (status == -NFS4ERR_BADNAME &&
2240                                 !(o_arg->open_flags & O_CREAT))
2241                         return -ENOENT;
2242                 return status;
2243         }
2244
2245         nfs_fattr_map_and_free_names(server, &data->f_attr);
2246
2247         if (o_arg->open_flags & O_CREAT) {
2248                 update_changeattr(dir, &o_res->cinfo);
2249                 if (o_arg->open_flags & O_EXCL)
2250                         data->file_created = 1;
2251                 else if (o_res->cinfo.before != o_res->cinfo.after)
2252                         data->file_created = 1;
2253         }
2254         if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
2255                 server->caps &= ~NFS_CAP_POSIX_LOCK;
2256         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
2257                 status = _nfs4_proc_open_confirm(data);
2258                 if (status != 0)
2259                         return status;
2260         }
2261         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
2262                 nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr, o_res->f_label);
2263         return 0;
2264 }
2265
2266 static int nfs4_recover_expired_lease(struct nfs_server *server)
2267 {
2268         return nfs4_client_recover_expired_lease(server->nfs_client);
2269 }
2270
2271 /*
2272  * OPEN_EXPIRED:
2273  *      reclaim state on the server after a network partition.
2274  *      Assumes caller holds the appropriate lock
2275  */
2276 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2277 {
2278         struct nfs4_opendata *opendata;
2279         int ret;
2280
2281         opendata = nfs4_open_recoverdata_alloc(ctx, state,
2282                         NFS4_OPEN_CLAIM_FH);
2283         if (IS_ERR(opendata))
2284                 return PTR_ERR(opendata);
2285         ret = nfs4_open_recover(opendata, state);
2286         if (ret == -ESTALE)
2287                 d_drop(ctx->dentry);
2288         nfs4_opendata_put(opendata);
2289         return ret;
2290 }
2291
2292 static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
2293 {
2294         struct nfs_server *server = NFS_SERVER(state->inode);
2295         struct nfs4_exception exception = { };
2296         int err;
2297
2298         do {
2299                 err = _nfs4_open_expired(ctx, state);
2300                 trace_nfs4_open_expired(ctx, 0, err);
2301                 if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
2302                         continue;
2303                 switch (err) {
2304                 default:
2305                         goto out;
2306                 case -NFS4ERR_GRACE:
2307                 case -NFS4ERR_DELAY:
2308                         nfs4_handle_exception(server, err, &exception);
2309                         err = 0;
2310                 }
2311         } while (exception.retry);
2312 out:
2313         return err;
2314 }
2315
2316 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2317 {
2318         struct nfs_open_context *ctx;
2319         int ret;
2320
2321         ctx = nfs4_state_find_open_context(state);
2322         if (IS_ERR(ctx))
2323                 return -EAGAIN;
2324         ret = nfs4_do_open_expired(ctx, state);
2325         put_nfs_open_context(ctx);
2326         return ret;
2327 }
2328
2329 static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state)
2330 {
2331         nfs_remove_bad_delegation(state->inode);
2332         write_seqlock(&state->seqlock);
2333         nfs4_stateid_copy(&state->stateid, &state->open_stateid);
2334         write_sequnlock(&state->seqlock);
2335         clear_bit(NFS_DELEGATED_STATE, &state->flags);
2336 }
2337
2338 static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
2339 {
2340         if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
2341                 nfs_finish_clear_delegation_stateid(state);
2342 }
2343
2344 static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2345 {
2346         /* NFSv4.0 doesn't allow for delegation recovery on open expire */
2347         nfs40_clear_delegation_stateid(state);
2348         return nfs4_open_expired(sp, state);
2349 }
2350
2351 #if defined(CONFIG_NFS_V4_1)
2352 static void nfs41_check_delegation_stateid(struct nfs4_state *state)
2353 {
2354         struct nfs_server *server = NFS_SERVER(state->inode);
2355         nfs4_stateid stateid;
2356         struct nfs_delegation *delegation;
2357         struct rpc_cred *cred;
2358         int status;
2359
2360         /* Get the delegation credential for use by test/free_stateid */
2361         rcu_read_lock();
2362         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
2363         if (delegation == NULL) {
2364                 rcu_read_unlock();
2365                 return;
2366         }
2367
2368         nfs4_stateid_copy(&stateid, &delegation->stateid);
2369         cred = get_rpccred(delegation->cred);
2370         rcu_read_unlock();
2371         status = nfs41_test_stateid(server, &stateid, cred);
2372         trace_nfs4_test_delegation_stateid(state, NULL, status);
2373
2374         if (status != NFS_OK) {
2375                 /* Free the stateid unless the server explicitly
2376                  * informs us the stateid is unrecognized. */
2377                 if (status != -NFS4ERR_BAD_STATEID)
2378                         nfs41_free_stateid(server, &stateid, cred);
2379                 nfs_finish_clear_delegation_stateid(state);
2380         }
2381
2382         put_rpccred(cred);
2383 }
2384
2385 /**
2386  * nfs41_check_open_stateid - possibly free an open stateid
2387  *
2388  * @state: NFSv4 state for an inode
2389  *
2390  * Returns NFS_OK if recovery for this stateid is now finished.
2391  * Otherwise a negative NFS4ERR value is returned.
2392  */
2393 static int nfs41_check_open_stateid(struct nfs4_state *state)
2394 {
2395         struct nfs_server *server = NFS_SERVER(state->inode);
2396         nfs4_stateid *stateid = &state->open_stateid;
2397         struct rpc_cred *cred = state->owner->so_cred;
2398         int status;
2399
2400         /* If a state reset has been done, test_stateid is unneeded */
2401         if ((test_bit(NFS_O_RDONLY_STATE, &state->flags) == 0) &&
2402             (test_bit(NFS_O_WRONLY_STATE, &state->flags) == 0) &&
2403             (test_bit(NFS_O_RDWR_STATE, &state->flags) == 0))
2404                 return -NFS4ERR_BAD_STATEID;
2405
2406         status = nfs41_test_stateid(server, stateid, cred);
2407         trace_nfs4_test_open_stateid(state, NULL, status);
2408         if (status != NFS_OK) {
2409                 /* Free the stateid unless the server explicitly
2410                  * informs us the stateid is unrecognized. */
2411                 if (status != -NFS4ERR_BAD_STATEID)
2412                         nfs41_free_stateid(server, stateid, cred);
2413
2414                 clear_bit(NFS_O_RDONLY_STATE, &state->flags);
2415                 clear_bit(NFS_O_WRONLY_STATE, &state->flags);
2416                 clear_bit(NFS_O_RDWR_STATE, &state->flags);
2417                 clear_bit(NFS_OPEN_STATE, &state->flags);
2418         }
2419         return status;
2420 }
2421
2422 static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
2423 {
2424         int status;
2425
2426         nfs41_check_delegation_stateid(state);
2427         status = nfs41_check_open_stateid(state);
2428         if (status != NFS_OK)
2429                 status = nfs4_open_expired(sp, state);
2430         return status;
2431 }
2432 #endif
2433
2434 /*
2435  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
2436  * fields corresponding to attributes that were used to store the verifier.
2437  * Make sure we clobber those fields in the later setattr call
2438  */
2439 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
2440                                 struct iattr *sattr, struct nfs4_label **label)
2441 {
2442         const u32 *attrset = opendata->o_res.attrset;
2443
2444         if ((attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
2445             !(sattr->ia_valid & ATTR_ATIME_SET))
2446                 sattr->ia_valid |= ATTR_ATIME;
2447
2448         if ((attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
2449             !(sattr->ia_valid & ATTR_MTIME_SET))
2450                 sattr->ia_valid |= ATTR_MTIME;
2451
2452         /* Except MODE, it seems harmless of setting twice. */
2453         if ((attrset[1] & FATTR4_WORD1_MODE))
2454                 sattr->ia_valid &= ~ATTR_MODE;
2455
2456         if (attrset[2] & FATTR4_WORD2_SECURITY_LABEL)
2457                 *label = NULL;
2458 }
2459
2460 static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
2461                 fmode_t fmode,
2462                 int flags,
2463                 struct nfs_open_context *ctx)
2464 {
2465         struct nfs4_state_owner *sp = opendata->owner;
2466         struct nfs_server *server = sp->so_server;
2467         struct dentry *dentry;
2468         struct nfs4_state *state;
2469         unsigned int seq;
2470         int ret;
2471
2472         seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
2473
2474         ret = _nfs4_proc_open(opendata);
2475         if (ret != 0)
2476                 goto out;
2477
2478         state = nfs4_opendata_to_nfs4_state(opendata);
2479         ret = PTR_ERR(state);
2480         if (IS_ERR(state))
2481                 goto out;
2482         if (server->caps & NFS_CAP_POSIX_LOCK)
2483                 set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
2484
2485         dentry = opendata->dentry;
2486         if (d_really_is_negative(dentry)) {
2487                 struct dentry *alias;
2488                 d_drop(dentry);
2489                 alias = d_exact_alias(dentry, state->inode);
2490                 if (!alias)
2491                         alias = d_splice_alias(igrab(state->inode), dentry);
2492                 /* d_splice_alias() can't fail here - it's a non-directory */
2493                 if (alias) {
2494                         dput(ctx->dentry);
2495                         ctx->dentry = dentry = alias;
2496                 }
2497                 nfs_set_verifier(dentry,
2498                                 nfs_save_change_attribute(d_inode(opendata->dir)));
2499         }
2500
2501         ret = nfs4_opendata_access(sp->so_cred, opendata, state, fmode, flags);
2502         if (ret != 0)
2503                 goto out;
2504
2505         ctx->state = state;
2506         if (d_inode(dentry) == state->inode) {
2507                 nfs_inode_attach_open_context(ctx);
2508                 if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
2509                         nfs4_schedule_stateid_recovery(server, state);
2510         }
2511 out:
2512         return ret;
2513 }
2514
2515 /*
2516  * Returns a referenced nfs4_state
2517  */
2518 static int _nfs4_do_open(struct inode *dir,
2519                         struct nfs_open_context *ctx,
2520                         int flags,
2521                         struct iattr *sattr,
2522                         struct nfs4_label *label,
2523                         int *opened)
2524 {
2525         struct nfs4_state_owner  *sp;
2526         struct nfs4_state     *state = NULL;
2527         struct nfs_server       *server = NFS_SERVER(dir);
2528         struct nfs4_opendata *opendata;
2529         struct dentry *dentry = ctx->dentry;
2530         struct rpc_cred *cred = ctx->cred;
2531         struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
2532         fmode_t fmode = ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
2533         enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
2534         struct nfs4_label *olabel = NULL;
2535         int status;
2536
2537         /* Protect against reboot recovery conflicts */
2538         status = -ENOMEM;
2539         sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
2540         if (sp == NULL) {
2541                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
2542                 goto out_err;
2543         }
2544         status = nfs4_recover_expired_lease(server);
2545         if (status != 0)
2546                 goto err_put_state_owner;
2547         if (d_really_is_positive(dentry))
2548                 nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
2549         status = -ENOMEM;
2550         if (d_really_is_positive(dentry))
2551                 claim = NFS4_OPEN_CLAIM_FH;
2552         opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags, sattr,
2553                         label, claim, GFP_KERNEL);
2554         if (opendata == NULL)
2555                 goto err_put_state_owner;
2556
2557         if (label) {
2558                 olabel = nfs4_label_alloc(server, GFP_KERNEL);
2559                 if (IS_ERR(olabel)) {
2560                         status = PTR_ERR(olabel);
2561                         goto err_opendata_put;
2562                 }
2563         }
2564
2565         if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
2566                 if (!opendata->f_attr.mdsthreshold) {
2567                         opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
2568                         if (!opendata->f_attr.mdsthreshold)
2569                                 goto err_free_label;
2570                 }
2571                 opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
2572         }
2573         if (d_really_is_positive(dentry))
2574                 opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
2575
2576         status = _nfs4_open_and_get_state(opendata, fmode, flags, ctx);
2577         if (status != 0)
2578                 goto err_free_label;
2579         state = ctx->state;
2580
2581         if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
2582             (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
2583                 nfs4_exclusive_attrset(opendata, sattr, &label);
2584                 /*
2585                  * send create attributes which was not set by open
2586                  * with an extra setattr.
2587                  */
2588                 if (sattr->ia_valid & NFS4_VALID_ATTRS) {
2589                         nfs_fattr_init(opendata->o_res.f_attr);
2590                         status = nfs4_do_setattr(state->inode, cred,
2591                                         opendata->o_res.f_attr, sattr,
2592                                         state, label, olabel);
2593                         if (status == 0) {
2594                                 nfs_setattr_update_inode(state->inode, sattr,
2595                                                 opendata->o_res.f_attr);
2596                                 nfs_setsecurity(state->inode, opendata->o_res.f_attr, olabel);
2597                         }
2598                 }
2599         }
2600         if (opened && opendata->file_created)
2601                 *opened |= FILE_CREATED;
2602
2603         if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
2604                 *ctx_th = opendata->f_attr.mdsthreshold;
2605                 opendata->f_attr.mdsthreshold = NULL;
2606         }
2607
2608         nfs4_label_free(olabel);
2609
2610         nfs4_opendata_put(opendata);
2611         nfs4_put_state_owner(sp);
2612         return 0;
2613 err_free_label:
2614         nfs4_label_free(olabel);
2615 err_opendata_put:
2616         nfs4_opendata_put(opendata);
2617 err_put_state_owner:
2618         nfs4_put_state_owner(sp);
2619 out_err:
2620         return status;
2621 }
2622
2623
2624 static struct nfs4_state *nfs4_do_open(struct inode *dir,
2625                                         struct nfs_open_context *ctx,
2626                                         int flags,
2627                                         struct iattr *sattr,
2628                                         struct nfs4_label *label,
2629                                         int *opened)
2630 {
2631         struct nfs_server *server = NFS_SERVER(dir);
2632         struct nfs4_exception exception = { };
2633         struct nfs4_state *res;
2634         int status;
2635
2636         do {
2637                 status = _nfs4_do_open(dir, ctx, flags, sattr, label, opened);
2638                 res = ctx->state;
2639                 trace_nfs4_open_file(ctx, flags, status);
2640                 if (status == 0)
2641                         break;
2642                 /* NOTE: BAD_SEQID means the server and client disagree about the
2643                  * book-keeping w.r.t. state-changing operations
2644                  * (OPEN/CLOSE/LOCK/LOCKU...)
2645                  * It is actually a sign of a bug on the client or on the server.
2646                  *
2647                  * If we receive a BAD_SEQID error in the particular case of
2648                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
2649                  * have unhashed the old state_owner for us, and that we can
2650                  * therefore safely retry using a new one. We should still warn
2651                  * the user though...
2652                  */
2653                 if (status == -NFS4ERR_BAD_SEQID) {
2654                         pr_warn_ratelimited("NFS: v4 server %s "
2655                                         " returned a bad sequence-id error!\n",
2656                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
2657                         exception.retry = 1;
2658                         continue;
2659                 }
2660                 /*
2661                  * BAD_STATEID on OPEN means that the server cancelled our
2662                  * state before it received the OPEN_CONFIRM.
2663                  * Recover by retrying the request as per the discussion
2664                  * on Page 181 of RFC3530.
2665                  */
2666                 if (status == -NFS4ERR_BAD_STATEID) {
2667                         exception.retry = 1;
2668                         continue;
2669                 }
2670                 if (status == -EAGAIN) {
2671                         /* We must have found a delegation */
2672                         exception.retry = 1;
2673                         continue;
2674                 }
2675                 if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
2676                         continue;
2677                 res = ERR_PTR(nfs4_handle_exception(server,
2678                                         status, &exception));
2679         } while (exception.retry);
2680         return res;
2681 }
2682
2683 static int _nfs4_do_setattr(struct inode *inode,
2684                             struct nfs_setattrargs *arg,
2685                             struct nfs_setattrres *res,
2686                             struct rpc_cred *cred,
2687                             struct nfs4_state *state)
2688 {
2689         struct nfs_server *server = NFS_SERVER(inode);
2690         struct rpc_message msg = {
2691                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
2692                 .rpc_argp       = arg,
2693                 .rpc_resp       = res,
2694                 .rpc_cred       = cred,
2695         };
2696         struct rpc_cred *delegation_cred = NULL;
2697         unsigned long timestamp = jiffies;
2698         fmode_t fmode;
2699         bool truncate;
2700         int status;
2701
2702         nfs_fattr_init(res->fattr);
2703
2704         /* Servers should only apply open mode checks for file size changes */
2705         truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
2706         fmode = truncate ? FMODE_WRITE : FMODE_READ;
2707
2708         if (nfs4_copy_delegation_stateid(inode, fmode, &arg->stateid, &delegation_cred)) {
2709                 /* Use that stateid */
2710         } else if (truncate && state != NULL) {
2711                 struct nfs_lockowner lockowner = {
2712                         .l_owner = current->files,
2713                         .l_pid = current->tgid,
2714                 };
2715                 if (!nfs4_valid_open_stateid(state))
2716                         return -EBADF;
2717                 if (nfs4_select_rw_stateid(state, FMODE_WRITE, &lockowner,
2718                                 &arg->stateid, &delegation_cred) == -EIO)
2719                         return -EBADF;
2720         } else
2721                 nfs4_stateid_copy(&arg->stateid, &zero_stateid);
2722         if (delegation_cred)
2723                 msg.rpc_cred = delegation_cred;
2724
2725         status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
2726
2727         put_rpccred(delegation_cred);
2728         if (status == 0 && state != NULL)
2729                 renew_lease(server, timestamp);
2730         trace_nfs4_setattr(inode, &arg->stateid, status);
2731         return status;
2732 }
2733
2734 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
2735                            struct nfs_fattr *fattr, struct iattr *sattr,
2736                            struct nfs4_state *state, struct nfs4_label *ilabel,
2737                            struct nfs4_label *olabel)
2738 {
2739         struct nfs_server *server = NFS_SERVER(inode);
2740         struct nfs_setattrargs  arg = {
2741                 .fh             = NFS_FH(inode),
2742                 .iap            = sattr,
2743                 .server         = server,
2744                 .bitmask = server->attr_bitmask,
2745                 .label          = ilabel,
2746         };
2747         struct nfs_setattrres  res = {
2748                 .fattr          = fattr,
2749                 .label          = olabel,
2750                 .server         = server,
2751         };
2752         struct nfs4_exception exception = {
2753                 .state = state,
2754                 .inode = inode,
2755                 .stateid = &arg.stateid,
2756         };
2757         int err;
2758
2759         arg.bitmask = nfs4_bitmask(server, ilabel);
2760         if (ilabel)
2761                 arg.bitmask = nfs4_bitmask(server, olabel);
2762
2763         do {
2764                 err = _nfs4_do_setattr(inode, &arg, &res, cred, state);
2765                 switch (err) {
2766                 case -NFS4ERR_OPENMODE:
2767                         if (!(sattr->ia_valid & ATTR_SIZE)) {
2768                                 pr_warn_once("NFSv4: server %s is incorrectly "
2769                                                 "applying open mode checks to "
2770                                                 "a SETATTR that is not "
2771                                                 "changing file size.\n",
2772                                                 server->nfs_client->cl_hostname);
2773                         }
2774                         if (state && !(state->state & FMODE_WRITE)) {
2775                                 err = -EBADF;
2776                                 if (sattr->ia_valid & ATTR_OPEN)
2777                                         err = -EACCES;
2778                                 goto out;
2779                         }
2780                 }
2781                 err = nfs4_handle_exception(server, err, &exception);
2782         } while (exception.retry);
2783 out:
2784         return err;
2785 }
2786
2787 static bool
2788 nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
2789 {
2790         if (inode == NULL || !nfs_have_layout(inode))
2791                 return false;
2792
2793         return pnfs_wait_on_layoutreturn(inode, task);
2794 }
2795
2796 struct nfs4_closedata {
2797         struct inode *inode;
2798         struct nfs4_state *state;
2799         struct nfs_closeargs arg;
2800         struct nfs_closeres res;
2801         struct nfs_fattr fattr;
2802         unsigned long timestamp;
2803         bool roc;
2804         u32 roc_barrier;
2805 };
2806
2807 static void nfs4_free_closedata(void *data)
2808 {
2809         struct nfs4_closedata *calldata = data;
2810         struct nfs4_state_owner *sp = calldata->state->owner;
2811         struct super_block *sb = calldata->state->inode->i_sb;
2812
2813         if (calldata->roc)
2814                 pnfs_roc_release(calldata->state->inode);
2815         nfs4_put_open_state(calldata->state);
2816         nfs_free_seqid(calldata->arg.seqid);
2817         nfs4_put_state_owner(sp);
2818         nfs_sb_deactive(sb);
2819         kfree(calldata);
2820 }
2821
2822 static void nfs4_close_done(struct rpc_task *task, void *data)
2823 {
2824         struct nfs4_closedata *calldata = data;
2825         struct nfs4_state *state = calldata->state;
2826         struct nfs_server *server = NFS_SERVER(calldata->inode);
2827         nfs4_stateid *res_stateid = NULL;
2828
2829         dprintk("%s: begin!\n", __func__);
2830         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
2831                 return;
2832         trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
2833         /* hmm. we are done with the inode, and in the process of freeing
2834          * the state_owner. we keep this around to process errors
2835          */
2836         switch (task->tk_status) {
2837                 case 0:
2838                         res_stateid = &calldata->res.stateid;
2839                         if (calldata->roc)
2840                                 pnfs_roc_set_barrier(state->inode,
2841                                                      calldata->roc_barrier);
2842                         renew_lease(server, calldata->timestamp);
2843                         break;
2844                 case -NFS4ERR_ADMIN_REVOKED:
2845                 case -NFS4ERR_STALE_STATEID:
2846                 case -NFS4ERR_OLD_STATEID:
2847                 case -NFS4ERR_BAD_STATEID:
2848                 case -NFS4ERR_EXPIRED:
2849                         if (!nfs4_stateid_match(&calldata->arg.stateid,
2850                                                 &state->open_stateid)) {
2851                                 rpc_restart_call_prepare(task);
2852                                 goto out_release;
2853                         }
2854                         if (calldata->arg.fmode == 0)
2855                                 break;
2856                 default:
2857                         if (nfs4_async_handle_error(task, server, state, NULL) == -EAGAIN) {
2858                                 rpc_restart_call_prepare(task);
2859                                 goto out_release;
2860                         }
2861         }
2862         nfs_clear_open_stateid(state, &calldata->arg.stateid,
2863                         res_stateid, calldata->arg.fmode);
2864 out_release:
2865         nfs_release_seqid(calldata->arg.seqid);
2866         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
2867         dprintk("%s: done, ret = %d!\n", __func__, task->tk_status);
2868 }
2869
2870 static void nfs4_close_prepare(struct rpc_task *task, void *data)
2871 {
2872         struct nfs4_closedata *calldata = data;
2873         struct nfs4_state *state = calldata->state;
2874         struct inode *inode = calldata->inode;
2875         bool is_rdonly, is_wronly, is_rdwr;
2876         int call_close = 0;
2877
2878         dprintk("%s: begin!\n", __func__);
2879         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
2880                 goto out_wait;
2881
2882         task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
2883         spin_lock(&state->owner->so_lock);
2884         is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
2885         is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
2886         is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
2887         nfs4_stateid_copy(&calldata->arg.stateid, &state->open_stateid);
2888         /* Calculate the change in open mode */
2889         calldata->arg.fmode = 0;
2890         if (state->n_rdwr == 0) {
2891                 if (state->n_rdonly == 0)
2892                         call_close |= is_rdonly;
2893                 else if (is_rdonly)
2894                         calldata->arg.fmode |= FMODE_READ;
2895                 if (state->n_wronly == 0)
2896                         call_close |= is_wronly;
2897                 else if (is_wronly)
2898                         calldata->arg.fmode |= FMODE_WRITE;
2899                 if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
2900                         call_close |= is_rdwr;
2901         } else if (is_rdwr)
2902                 calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
2903
2904         if (!nfs4_valid_open_stateid(state))
2905                 call_close = 0;
2906         spin_unlock(&state->owner->so_lock);
2907
2908         if (!call_close) {
2909                 /* Note: exit _without_ calling nfs4_close_done */
2910                 goto out_no_action;
2911         }
2912
2913         if (nfs4_wait_on_layoutreturn(inode, task)) {
2914                 nfs_release_seqid(calldata->arg.seqid);
2915                 goto out_wait;
2916         }
2917
2918         if (calldata->arg.fmode == 0)
2919                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
2920         if (calldata->roc)
2921                 pnfs_roc_get_barrier(inode, &calldata->roc_barrier);
2922
2923         calldata->arg.share_access =
2924                 nfs4_map_atomic_open_share(NFS_SERVER(inode),
2925                                 calldata->arg.fmode, 0);
2926
2927         nfs_fattr_init(calldata->res.fattr);
2928         calldata->timestamp = jiffies;
2929         if (nfs4_setup_sequence(NFS_SERVER(inode),
2930                                 &calldata->arg.seq_args,
2931                                 &calldata->res.seq_res,
2932                                 task) != 0)
2933                 nfs_release_seqid(calldata->arg.seqid);
2934         dprintk("%s: done!\n", __func__);
2935         return;
2936 out_no_action:
2937         task->tk_action = NULL;
2938 out_wait:
2939         nfs4_sequence_done(task, &calldata->res.seq_res);
2940 }
2941
2942 static const struct rpc_call_ops nfs4_close_ops = {
2943         .rpc_call_prepare = nfs4_close_prepare,
2944         .rpc_call_done = nfs4_close_done,
2945         .rpc_release = nfs4_free_closedata,
2946 };
2947
2948 static bool nfs4_roc(struct inode *inode)
2949 {
2950         if (!nfs_have_layout(inode))
2951                 return false;
2952         return pnfs_roc(inode);
2953 }
2954
2955 /*
2956  * It is possible for data to be read/written from a mem-mapped file
2957  * after the sys_close call (which hits the vfs layer as a flush).
2958  * This means that we can't safely call nfsv4 close on a file until
2959  * the inode is cleared. This in turn means that we are not good
2960  * NFSv4 citizens - we do not indicate to the server to update the file's
2961  * share state even when we are done with one of the three share
2962  * stateid's in the inode.
2963  *
2964  * NOTE: Caller must be holding the sp->so_owner semaphore!
2965  */
2966 int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
2967 {
2968         struct nfs_server *server = NFS_SERVER(state->inode);
2969         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
2970         struct nfs4_closedata *calldata;
2971         struct nfs4_state_owner *sp = state->owner;
2972         struct rpc_task *task;
2973         struct rpc_message msg = {
2974                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
2975                 .rpc_cred = state->owner->so_cred,
2976         };
2977         struct rpc_task_setup task_setup_data = {
2978                 .rpc_client = server->client,
2979                 .rpc_message = &msg,
2980                 .callback_ops = &nfs4_close_ops,
2981                 .workqueue = nfsiod_workqueue,
2982                 .flags = RPC_TASK_ASYNC,
2983         };
2984         int status = -ENOMEM;
2985
2986         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
2987                 &task_setup_data.rpc_client, &msg);
2988
2989         calldata = kzalloc(sizeof(*calldata), gfp_mask);
2990         if (calldata == NULL)
2991                 goto out;
2992         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1);
2993         calldata->inode = state->inode;
2994         calldata->state = state;
2995         calldata->arg.fh = NFS_FH(state->inode);
2996         /* Serialization for the sequence id */
2997         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
2998         calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
2999         if (IS_ERR(calldata->arg.seqid))
3000                 goto out_free_calldata;
3001         calldata->arg.fmode = 0;
3002         calldata->arg.bitmask = server->cache_consistency_bitmask;
3003         calldata->res.fattr = &calldata->fattr;
3004         calldata->res.seqid = calldata->arg.seqid;
3005         calldata->res.server = server;
3006         calldata->roc = nfs4_roc(state->inode);
3007         nfs_sb_active(calldata->inode->i_sb);
3008
3009         msg.rpc_argp = &calldata->arg;
3010         msg.rpc_resp = &calldata->res;
3011         task_setup_data.callback_data = calldata;
3012         task = rpc_run_task(&task_setup_data);
3013         if (IS_ERR(task))
3014                 return PTR_ERR(task);
3015         status = 0;
3016         if (wait)
3017                 status = rpc_wait_for_completion_task(task);
3018         rpc_put_task(task);
3019         return status;
3020 out_free_calldata:
3021         kfree(calldata);
3022 out:
3023         nfs4_put_open_state(state);
3024         nfs4_put_state_owner(sp);
3025         return status;
3026 }
3027
3028 static struct inode *
3029 nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
3030                 int open_flags, struct iattr *attr, int *opened)
3031 {
3032         struct nfs4_state *state;
3033         struct nfs4_label l = {0, 0, 0, NULL}, *label = NULL;
3034
3035         label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
3036
3037         /* Protect against concurrent sillydeletes */
3038         state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
3039
3040         nfs4_label_release_security(label);
3041
3042         if (IS_ERR(state))
3043                 return ERR_CAST(state);
3044         return state->inode;
3045 }
3046
3047 static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
3048 {
3049         if (ctx->state == NULL)
3050                 return;
3051         if (is_sync)
3052                 nfs4_close_sync(ctx->state, ctx->mode);
3053         else
3054                 nfs4_close_state(ctx->state, ctx->mode);
3055 }
3056
3057 #define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
3058 #define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
3059 #define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_SECURITY_LABEL - 1UL)
3060
3061 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3062 {
3063         u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
3064         struct nfs4_server_caps_arg args = {
3065                 .fhandle = fhandle,
3066                 .bitmask = bitmask,
3067         };
3068         struct nfs4_server_caps_res res = {};
3069         struct rpc_message msg = {
3070                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
3071                 .rpc_argp = &args,
3072                 .rpc_resp = &res,
3073         };
3074         int status;
3075
3076         bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
3077                      FATTR4_WORD0_FH_EXPIRE_TYPE |
3078                      FATTR4_WORD0_LINK_SUPPORT |
3079                      FATTR4_WORD0_SYMLINK_SUPPORT |
3080                      FATTR4_WORD0_ACLSUPPORT;
3081         if (minorversion)
3082                 bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
3083
3084         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3085         if (status == 0) {
3086                 /* Sanity check the server answers */
3087                 switch (minorversion) {
3088                 case 0:
3089                         res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
3090                         res.attr_bitmask[2] = 0;
3091                         break;
3092                 case 1:
3093                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
3094                         break;
3095                 case 2:
3096                         res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
3097                 }
3098                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
3099                 server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
3100                                 NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
3101                                 NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
3102                                 NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
3103                                 NFS_CAP_CTIME|NFS_CAP_MTIME|
3104                                 NFS_CAP_SECURITY_LABEL);
3105                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
3106                                 res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
3107                         server->caps |= NFS_CAP_ACLS;
3108                 if (res.has_links != 0)
3109                         server->caps |= NFS_CAP_HARDLINKS;
3110                 if (res.has_symlinks != 0)
3111                         server->caps |= NFS_CAP_SYMLINKS;
3112                 if (res.attr_bitmask[0] & FATTR4_WORD0_FILEID)
3113                         server->caps |= NFS_CAP_FILEID;
3114                 if (res.attr_bitmask[1] & FATTR4_WORD1_MODE)
3115                         server->caps |= NFS_CAP_MODE;
3116                 if (res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS)
3117                         server->caps |= NFS_CAP_NLINK;
3118                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER)
3119                         server->caps |= NFS_CAP_OWNER;
3120                 if (res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP)
3121                         server->caps |= NFS_CAP_OWNER_GROUP;
3122                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS)
3123                         server->caps |= NFS_CAP_ATIME;
3124                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA)
3125                         server->caps |= NFS_CAP_CTIME;
3126                 if (res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY)
3127                         server->caps |= NFS_CAP_MTIME;
3128 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
3129                 if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
3130                         server->caps |= NFS_CAP_SECURITY_LABEL;
3131 #endif
3132                 memcpy(server->attr_bitmask_nl, res.attr_bitmask,
3133                                 sizeof(server->attr_bitmask));
3134                 server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
3135
3136                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
3137                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
3138                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
3139                 server->cache_consistency_bitmask[2] = 0;
3140                 memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
3141                         sizeof(server->exclcreat_bitmask));
3142                 server->acl_bitmask = res.acl_bitmask;
3143                 server->fh_expire_type = res.fh_expire_type;
3144         }
3145
3146         return status;
3147 }
3148
3149 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
3150 {
3151         struct nfs4_exception exception = { };
3152         int err;
3153         do {
3154                 err = nfs4_handle_exception(server,
3155                                 _nfs4_server_capabilities(server, fhandle),
3156                                 &exception);
3157         } while (exception.retry);
3158         return err;
3159 }
3160
3161 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3162                 struct nfs_fsinfo *info)
3163 {
3164         u32 bitmask[3];
3165         struct nfs4_lookup_root_arg args = {
3166                 .bitmask = bitmask,
3167         };
3168         struct nfs4_lookup_res res = {
3169                 .server = server,
3170                 .fattr = info->fattr,
3171                 .fh = fhandle,
3172         };
3173         struct rpc_message msg = {
3174                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
3175                 .rpc_argp = &args,
3176                 .rpc_resp = &res,
3177         };
3178
3179         bitmask[0] = nfs4_fattr_bitmap[0];
3180         bitmask[1] = nfs4_fattr_bitmap[1];
3181         /*
3182          * Process the label in the upcoming getfattr
3183          */
3184         bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
3185
3186         nfs_fattr_init(info->fattr);
3187         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3188 }
3189
3190 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
3191                 struct nfs_fsinfo *info)
3192 {
3193         struct nfs4_exception exception = { };
3194         int err;
3195         do {
3196                 err = _nfs4_lookup_root(server, fhandle, info);
3197                 trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
3198                 switch (err) {
3199                 case 0:
3200                 case -NFS4ERR_WRONGSEC:
3201                         goto out;
3202                 default:
3203                         err = nfs4_handle_exception(server, err, &exception);
3204                 }
3205         } while (exception.retry);
3206 out:
3207         return err;
3208 }
3209
3210 static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3211                                 struct nfs_fsinfo *info, rpc_authflavor_t flavor)
3212 {
3213         struct rpc_auth_create_args auth_args = {
3214                 .pseudoflavor = flavor,
3215         };
3216         struct rpc_auth *auth;
3217         int ret;
3218
3219         auth = rpcauth_create(&auth_args, server->client);
3220         if (IS_ERR(auth)) {
3221                 ret = -EACCES;
3222                 goto out;
3223         }
3224         ret = nfs4_lookup_root(server, fhandle, info);
3225 out:
3226         return ret;
3227 }
3228
3229 /*
3230  * Retry pseudoroot lookup with various security flavors.  We do this when:
3231  *
3232  *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
3233  *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
3234  *
3235  * Returns zero on success, or a negative NFS4ERR value, or a
3236  * negative errno value.
3237  */
3238 static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
3239                               struct nfs_fsinfo *info)
3240 {
3241         /* Per 3530bis 15.33.5 */
3242         static const rpc_authflavor_t flav_array[] = {
3243                 RPC_AUTH_GSS_KRB5P,
3244                 RPC_AUTH_GSS_KRB5I,
3245                 RPC_AUTH_GSS_KRB5,
3246                 RPC_AUTH_UNIX,                  /* courtesy */
3247                 RPC_AUTH_NULL,
3248         };
3249         int status = -EPERM;
3250         size_t i;
3251
3252         if (server->auth_info.flavor_len > 0) {
3253                 /* try each flavor specified by user */
3254                 for (i = 0; i < server->auth_info.flavor_len; i++) {
3255                         status = nfs4_lookup_root_sec(server, fhandle, info,
3256                                                 server->auth_info.flavors[i]);
3257                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3258                                 continue;
3259                         break;
3260                 }
3261         } else {
3262                 /* no flavors specified by user, try default list */
3263                 for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
3264                         status = nfs4_lookup_root_sec(server, fhandle, info,
3265                                                       flav_array[i]);
3266                         if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
3267                                 continue;
3268                         break;
3269                 }
3270         }
3271
3272         /*
3273          * -EACCESS could mean that the user doesn't have correct permissions
3274          * to access the mount.  It could also mean that we tried to mount
3275          * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
3276          * existing mount programs don't handle -EACCES very well so it should
3277          * be mapped to -EPERM instead.
3278          */
3279         if (status == -EACCES)
3280                 status = -EPERM;
3281         return status;
3282 }
3283
3284 static int nfs4_do_find_root_sec(struct nfs_server *server,
3285                 struct nfs_fh *fhandle, struct nfs_fsinfo *info)
3286 {
3287         int mv = server->nfs_client->cl_minorversion;
3288         return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info);
3289 }
3290
3291 /**
3292  * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
3293  * @server: initialized nfs_server handle
3294  * @fhandle: we fill in the pseudo-fs root file handle
3295  * @info: we fill in an FSINFO struct
3296  * @auth_probe: probe the auth flavours
3297  *
3298  * Returns zero on success, or a negative errno.
3299  */
3300 int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
3301                          struct nfs_fsinfo *info,
3302                          bool auth_probe)
3303 {
3304         int status = 0;
3305
3306         if (!auth_probe)
3307                 status = nfs4_lookup_root(server, fhandle, info);
3308
3309         if (auth_probe || status == NFS4ERR_WRONGSEC)
3310                 status = nfs4_do_find_root_sec(server, fhandle, info);
3311
3312         if (status == 0)
3313                 status = nfs4_server_capabilities(server, fhandle);
3314         if (status == 0)
3315                 status = nfs4_do_fsinfo(server, fhandle, info);
3316
3317         return nfs4_map_errors(status);
3318 }
3319
3320 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
3321                               struct nfs_fsinfo *info)
3322 {
3323         int error;
3324         struct nfs_fattr *fattr = info->fattr;
3325         struct nfs4_label *label = NULL;
3326
3327         error = nfs4_server_capabilities(server, mntfh);
3328         if (error < 0) {
3329                 dprintk("nfs4_get_root: getcaps error = %d\n", -error);
3330                 return error;
3331         }
3332
3333         label = nfs4_label_alloc(server, GFP_KERNEL);
3334         if (IS_ERR(label))
3335                 return PTR_ERR(label);
3336
3337         error = nfs4_proc_getattr(server, mntfh, fattr, label);
3338         if (error < 0) {
3339                 dprintk("nfs4_get_root: getattr error = %d\n", -error);
3340                 goto err_free_label;
3341         }
3342
3343         if (fattr->valid & NFS_ATTR_FATTR_FSID &&
3344             !nfs_fsid_equal(&server->fsid, &fattr->fsid))
3345                 memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
3346
3347 err_free_label:
3348         nfs4_label_free(label);
3349
3350         return error;
3351 }
3352
3353 /*
3354  * Get locations and (maybe) other attributes of a referral.
3355  * Note that we'll actually follow the referral later when
3356  * we detect fsid mismatch in inode revalidation
3357  */
3358 static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
3359                              const struct qstr *name, struct nfs_fattr *fattr,
3360                              struct nfs_fh *fhandle)
3361 {
3362         int status = -ENOMEM;
3363         struct page *page = NULL;
3364         struct nfs4_fs_locations *locations = NULL;
3365
3366         page = alloc_page(GFP_KERNEL);
3367         if (page == NULL)
3368                 goto out;
3369         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
3370         if (locations == NULL)
3371                 goto out;
3372
3373         status = nfs4_proc_fs_locations(client, dir, name, locations, page);
3374         if (status != 0)
3375                 goto out;
3376
3377         /*
3378          * If the fsid didn't change, this is a migration event, not a
3379          * referral.  Cause us to drop into the exception handler, which
3380          * will kick off migration recovery.
3381          */
3382         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
3383                 dprintk("%s: server did not return a different fsid for"
3384                         " a referral at %s\n", __func__, name->name);
3385                 status = -NFS4ERR_MOVED;
3386                 goto out;
3387         }
3388         /* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
3389         nfs_fixup_referral_attributes(&locations->fattr);
3390
3391         /* replace the lookup nfs_fattr with the locations nfs_fattr */
3392         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
3393         memset(fhandle, 0, sizeof(struct nfs_fh));
3394 out:
3395         if (page)
3396                 __free_page(page);
3397         kfree(locations);
3398         return status;
3399 }
3400
3401 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3402                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3403 {
3404         struct nfs4_getattr_arg args = {
3405                 .fh = fhandle,
3406                 .bitmask = server->attr_bitmask,
3407         };
3408         struct nfs4_getattr_res res = {
3409                 .fattr = fattr,
3410                 .label = label,
3411                 .server = server,
3412         };
3413         struct rpc_message msg = {
3414                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
3415                 .rpc_argp = &args,
3416                 .rpc_resp = &res,
3417         };
3418
3419         args.bitmask = nfs4_bitmask(server, label);
3420
3421         nfs_fattr_init(fattr);
3422         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3423 }
3424
3425 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
3426                                 struct nfs_fattr *fattr, struct nfs4_label *label)
3427 {
3428         struct nfs4_exception exception = { };
3429         int err;
3430         do {
3431                 err = _nfs4_proc_getattr(server, fhandle, fattr, label);
3432                 trace_nfs4_getattr(server, fhandle, fattr, err);
3433                 err = nfs4_handle_exception(server, err,
3434                                 &exception);
3435         } while (exception.retry);
3436         return err;
3437 }
3438
3439 /*
3440  * The file is not closed if it is opened due to the a request to change
3441  * the size of the file. The open call will not be needed once the
3442  * VFS layer lookup-intents are implemented.
3443  *
3444  * Close is called when the inode is destroyed.
3445  * If we haven't opened the file for O_WRONLY, we
3446  * need to in the size_change case to obtain a stateid.
3447  *
3448  * Got race?
3449  * Because OPEN is always done by name in nfsv4, it is
3450  * possible that we opened a different file by the same
3451  * name.  We can recognize this race condition, but we
3452  * can't do anything about it besides returning an error.
3453  *
3454  * This will be fixed with VFS changes (lookup-intent).
3455  */
3456 static int
3457 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
3458                   struct iattr *sattr)
3459 {
3460         struct inode *inode = d_inode(dentry);
3461         struct rpc_cred *cred = NULL;
3462         struct nfs4_state *state = NULL;
3463         struct nfs4_label *label = NULL;
3464         int status;
3465
3466         if (pnfs_ld_layoutret_on_setattr(inode) &&
3467             sattr->ia_valid & ATTR_SIZE &&
3468             sattr->ia_size < i_size_read(inode))
3469                 pnfs_commit_and_return_layout(inode);
3470
3471         nfs_fattr_init(fattr);
3472
3473         /* Deal with open(O_TRUNC) */
3474         if (sattr->ia_valid & ATTR_OPEN)
3475                 sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
3476
3477         /* Optimization: if the end result is no change, don't RPC */
3478         if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
3479                 return 0;
3480
3481         /* Search for an existing open(O_WRITE) file */
3482         if (sattr->ia_valid & ATTR_FILE) {
3483                 struct nfs_open_context *ctx;
3484
3485                 ctx = nfs_file_open_context(sattr->ia_file);
3486                 if (ctx) {
3487                         cred = ctx->cred;
3488                         state = ctx->state;
3489                 }
3490         }
3491
3492         label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
3493         if (IS_ERR(label))
3494                 return PTR_ERR(label);
3495
3496         status = nfs4_do_setattr(inode, cred, fattr, sattr, state, NULL, label);
3497         if (status == 0) {
3498                 nfs_setattr_update_inode(inode, sattr, fattr);
3499                 nfs_setsecurity(inode, fattr, label);
3500         }
3501         nfs4_label_free(label);
3502         return status;
3503 }
3504
3505 static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
3506                 const struct qstr *name, struct nfs_fh *fhandle,
3507                 struct nfs_fattr *fattr, struct nfs4_label *label)
3508 {
3509         struct nfs_server *server = NFS_SERVER(dir);
3510         int                    status;
3511         struct nfs4_lookup_arg args = {
3512                 .bitmask = server->attr_bitmask,
3513                 .dir_fh = NFS_FH(dir),
3514                 .name = name,
3515         };
3516         struct nfs4_lookup_res res = {
3517                 .server = server,
3518                 .fattr = fattr,
3519                 .label = label,
3520                 .fh = fhandle,
3521         };
3522         struct rpc_message msg = {
3523                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
3524                 .rpc_argp = &args,
3525                 .rpc_resp = &res,
3526         };
3527
3528         args.bitmask = nfs4_bitmask(server, label);
3529
3530         nfs_fattr_init(fattr);
3531
3532         dprintk("NFS call  lookup %s\n", name->name);
3533         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, &res.seq_res, 0);
3534         dprintk("NFS reply lookup: %d\n", status);
3535         return status;
3536 }
3537
3538 static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
3539 {
3540         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3541                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
3542         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3543         fattr->nlink = 2;
3544 }
3545
3546 static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
3547                                    struct qstr *name, struct nfs_fh *fhandle,
3548                                    struct nfs_fattr *fattr, struct nfs4_label *label)
3549 {
3550         struct nfs4_exception exception = { };
3551         struct rpc_clnt *client = *clnt;
3552         int err;
3553         do {
3554                 err = _nfs4_proc_lookup(client, dir, name, fhandle, fattr, label);
3555                 trace_nfs4_lookup(dir, name, err);
3556                 switch (err) {
3557                 case -NFS4ERR_BADNAME:
3558                         err = -ENOENT;
3559                         goto out;
3560                 case -NFS4ERR_MOVED:
3561                         err = nfs4_get_referral(client, dir, name, fattr, fhandle);
3562                         if (err == -NFS4ERR_MOVED)
3563                                 err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3564                         goto out;
3565                 case -NFS4ERR_WRONGSEC:
3566                         err = -EPERM;
3567                         if (client != *clnt)
3568                                 goto out;
3569                         client = nfs4_negotiate_security(client, dir, name);
3570                         if (IS_ERR(client))
3571                                 return PTR_ERR(client);
3572
3573                         exception.retry = 1;
3574                         break;
3575                 default:
3576                         err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
3577                 }
3578         } while (exception.retry);
3579
3580 out:
3581         if (err == 0)
3582                 *clnt = client;
3583         else if (client != *clnt)
3584                 rpc_shutdown_client(client);
3585
3586         return err;
3587 }
3588
3589 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name,
3590                             struct nfs_fh *fhandle, struct nfs_fattr *fattr,
3591                             struct nfs4_label *label)
3592 {
3593         int status;
3594         struct rpc_clnt *client = NFS_CLIENT(dir);
3595
3596         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, label);
3597         if (client != NFS_CLIENT(dir)) {
3598                 rpc_shutdown_client(client);
3599                 nfs_fixup_secinfo_attributes(fattr);
3600         }
3601         return status;
3602 }
3603
3604 struct rpc_clnt *
3605 nfs4_proc_lookup_mountpoint(struct inode *dir, struct qstr *name,
3606                             struct nfs_fh *fhandle, struct nfs_fattr *fattr)
3607 {
3608         struct rpc_clnt *client = NFS_CLIENT(dir);
3609         int status;
3610
3611         status = nfs4_proc_lookup_common(&client, dir, name, fhandle, fattr, NULL);
3612         if (status < 0)
3613                 return ERR_PTR(status);
3614         return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
3615 }
3616
3617 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3618 {
3619         struct nfs_server *server = NFS_SERVER(inode);
3620         struct nfs4_accessargs args = {
3621                 .fh = NFS_FH(inode),
3622                 .bitmask = server->cache_consistency_bitmask,
3623         };
3624         struct nfs4_accessres res = {
3625                 .server = server,
3626         };
3627         struct rpc_message msg = {
3628                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
3629                 .rpc_argp = &args,
3630                 .rpc_resp = &res,
3631                 .rpc_cred = entry->cred,
3632         };
3633         int mode = entry->mask;
3634         int status = 0;
3635
3636         /*
3637          * Determine which access bits we want to ask for...
3638          */
3639         if (mode & MAY_READ)
3640                 args.access |= NFS4_ACCESS_READ;
3641         if (S_ISDIR(inode->i_mode)) {
3642                 if (mode & MAY_WRITE)
3643                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
3644                 if (mode & MAY_EXEC)
3645                         args.access |= NFS4_ACCESS_LOOKUP;
3646         } else {
3647                 if (mode & MAY_WRITE)
3648                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
3649                 if (mode & MAY_EXEC)
3650                         args.access |= NFS4_ACCESS_EXECUTE;
3651         }
3652
3653         res.fattr = nfs_alloc_fattr();
3654         if (res.fattr == NULL)
3655                 return -ENOMEM;
3656
3657         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
3658         if (!status) {
3659                 nfs_access_set_mask(entry, res.access);
3660                 nfs_refresh_inode(inode, res.fattr);
3661         }
3662         nfs_free_fattr(res.fattr);
3663         return status;
3664 }
3665
3666 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
3667 {
3668         struct nfs4_exception exception = { };
3669         int err;
3670         do {
3671                 err = _nfs4_proc_access(inode, entry);
3672                 trace_nfs4_access(inode, err);
3673                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3674                                 &exception);
3675         } while (exception.retry);
3676         return err;
3677 }
3678
3679 /*
3680  * TODO: For the time being, we don't try to get any attributes
3681  * along with any of the zero-copy operations READ, READDIR,
3682  * READLINK, WRITE.
3683  *
3684  * In the case of the first three, we want to put the GETATTR
3685  * after the read-type operation -- this is because it is hard
3686  * to predict the length of a GETATTR response in v4, and thus
3687  * align the READ data correctly.  This means that the GETATTR
3688  * may end up partially falling into the page cache, and we should
3689  * shift it into the 'tail' of the xdr_buf before processing.
3690  * To do this efficiently, we need to know the total length
3691  * of data received, which doesn't seem to be available outside
3692  * of the RPC layer.
3693  *
3694  * In the case of WRITE, we also want to put the GETATTR after
3695  * the operation -- in this case because we want to make sure
3696  * we get the post-operation mtime and size.
3697  *
3698  * Both of these changes to the XDR layer would in fact be quite
3699  * minor, but I decided to leave them for a subsequent patch.
3700  */
3701 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
3702                 unsigned int pgbase, unsigned int pglen)
3703 {
3704         struct nfs4_readlink args = {
3705                 .fh       = NFS_FH(inode),
3706                 .pgbase   = pgbase,
3707                 .pglen    = pglen,
3708                 .pages    = &page,
3709         };
3710         struct nfs4_readlink_res res;
3711         struct rpc_message msg = {
3712                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
3713                 .rpc_argp = &args,
3714                 .rpc_resp = &res,
3715         };
3716
3717         return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
3718 }
3719
3720 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
3721                 unsigned int pgbase, unsigned int pglen)
3722 {
3723         struct nfs4_exception exception = { };
3724         int err;
3725         do {
3726                 err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
3727                 trace_nfs4_readlink(inode, err);
3728                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
3729                                 &exception);
3730         } while (exception.retry);
3731         return err;
3732 }
3733
3734 /*
3735  * This is just for mknod.  open(O_CREAT) will always do ->open_context().
3736  */
3737 static int
3738 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
3739                  int flags)
3740 {
3741         struct nfs4_label l, *ilabel = NULL;
3742         struct nfs_open_context *ctx;
3743         struct nfs4_state *state;
3744         int status = 0;
3745
3746         ctx = alloc_nfs_open_context(dentry, FMODE_READ);
3747         if (IS_ERR(ctx))
3748                 return PTR_ERR(ctx);
3749
3750         ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
3751
3752         sattr->ia_mode &= ~current_umask();
3753         state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
3754         if (IS_ERR(state)) {
3755                 status = PTR_ERR(state);
3756                 goto out;
3757         }
3758 out:
3759         nfs4_label_release_security(ilabel);
3760         put_nfs_open_context(ctx);
3761         return status;
3762 }
3763
3764 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
3765 {
3766         struct nfs_server *server = NFS_SERVER(dir);
3767         struct nfs_removeargs args = {
3768                 .fh = NFS_FH(dir),
3769                 .name = *name,
3770         };
3771         struct nfs_removeres res = {
3772                 .server = server,
3773         };
3774         struct rpc_message msg = {
3775                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
3776                 .rpc_argp = &args,
3777                 .rpc_resp = &res,
3778         };
3779         int status;
3780
3781         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
3782         if (status == 0)
3783                 update_changeattr(dir, &res.cinfo);
3784         return status;
3785 }
3786
3787 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
3788 {
3789         struct nfs4_exception exception = { };
3790         int err;
3791         do {
3792                 err = _nfs4_proc_remove(dir, name);
3793                 trace_nfs4_remove(dir, name, err);
3794                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
3795                                 &exception);
3796         } while (exception.retry);
3797         return err;
3798 }
3799
3800 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
3801 {
3802         struct nfs_server *server = NFS_SERVER(dir);
3803         struct nfs_removeargs *args = msg->rpc_argp;
3804         struct nfs_removeres *res = msg->rpc_resp;
3805
3806         res->server = server;
3807         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
3808         nfs4_init_sequence(&args->seq_args, &res->seq_res, 1);
3809
3810         nfs_fattr_init(res->dir_attr);
3811 }
3812
3813 static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
3814 {
3815         nfs4_setup_sequence(NFS_SB(data->dentry->d_sb),
3816                         &data->args.seq_args,
3817                         &data->res.seq_res,
3818                         task);
3819 }
3820
3821 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
3822 {
3823         struct nfs_unlinkdata *data = task->tk_calldata;
3824         struct nfs_removeres *res = &data->res;
3825
3826         if (!nfs4_sequence_done(task, &res->seq_res))
3827                 return 0;
3828         if (nfs4_async_handle_error(task, res->server, NULL,
3829                                     &data->timeout) == -EAGAIN)
3830                 return 0;
3831         update_changeattr(dir, &res->cinfo);
3832         return 1;
3833 }
3834
3835 static void nfs4_proc_rename_setup(struct rpc_message *msg, struct inode *dir)
3836 {
3837         struct nfs_server *server = NFS_SERVER(dir);
3838         struct nfs_renameargs *arg = msg->rpc_argp;
3839         struct nfs_renameres *res = msg->rpc_resp;
3840
3841         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
3842         res->server = server;
3843         nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1);
3844 }
3845
3846 static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
3847 {
3848         nfs4_setup_sequence(NFS_SERVER(data->old_dir),
3849                         &data->args.seq_args,
3850                         &data->res.seq_res,
3851                         task);
3852 }
3853
3854 static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
3855                                  struct inode *new_dir)
3856 {
3857         struct nfs_renamedata *data = task->tk_calldata;
3858         struct nfs_renameres *res = &data->res;
3859
3860         if (!nfs4_sequence_done(task, &res->seq_res))
3861                 return 0;
3862         if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
3863                 return 0;
3864
3865         update_changeattr(old_dir, &res->old_cinfo);
3866         update_changeattr(new_dir, &res->new_cinfo);
3867         return 1;
3868 }
3869
3870 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3871 {
3872         struct nfs_server *server = NFS_SERVER(inode);
3873         struct nfs4_link_arg arg = {
3874                 .fh     = NFS_FH(inode),
3875                 .dir_fh = NFS_FH(dir),
3876                 .name   = name,
3877                 .bitmask = server->attr_bitmask,
3878         };
3879         struct nfs4_link_res res = {
3880                 .server = server,
3881                 .label = NULL,
3882         };
3883         struct rpc_message msg = {
3884                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
3885                 .rpc_argp = &arg,
3886                 .rpc_resp = &res,
3887         };
3888         int status = -ENOMEM;
3889
3890         res.fattr = nfs_alloc_fattr();
3891         if (res.fattr == NULL)
3892                 goto out;
3893
3894         res.label = nfs4_label_alloc(server, GFP_KERNEL);
3895         if (IS_ERR(res.label)) {
3896                 status = PTR_ERR(res.label);
3897                 goto out;
3898         }
3899         arg.bitmask = nfs4_bitmask(server, res.label);
3900
3901         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
3902         if (!status) {
3903                 update_changeattr(dir, &res.cinfo);
3904                 status = nfs_post_op_update_inode(inode, res.fattr);
3905                 if (!status)
3906                         nfs_setsecurity(inode, res.fattr, res.label);
3907         }
3908
3909
3910         nfs4_label_free(res.label);
3911
3912 out:
3913         nfs_free_fattr(res.fattr);
3914         return status;
3915 }
3916
3917 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
3918 {
3919         struct nfs4_exception exception = { };
3920         int err;
3921         do {
3922                 err = nfs4_handle_exception(NFS_SERVER(inode),
3923                                 _nfs4_proc_link(inode, dir, name),
3924                                 &exception);
3925         } while (exception.retry);
3926         return err;
3927 }
3928
3929 struct nfs4_createdata {
3930         struct rpc_message msg;
3931         struct nfs4_create_arg arg;
3932         struct nfs4_create_res res;
3933         struct nfs_fh fh;
3934         struct nfs_fattr fattr;
3935         struct nfs4_label *label;
3936 };
3937
3938 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
3939                 struct qstr *name, struct iattr *sattr, u32 ftype)
3940 {
3941         struct nfs4_createdata *data;
3942
3943         data = kzalloc(sizeof(*data), GFP_KERNEL);
3944         if (data != NULL) {
3945                 struct nfs_server *server = NFS_SERVER(dir);
3946
3947                 data->label = nfs4_label_alloc(server, GFP_KERNEL);
3948                 if (IS_ERR(data->label))
3949                         goto out_free;
3950
3951                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
3952                 data->msg.rpc_argp = &data->arg;
3953                 data->msg.rpc_resp = &data->res;
3954                 data->arg.dir_fh = NFS_FH(dir);
3955                 data->arg.server = server;
3956                 data->arg.name = name;
3957                 data->arg.attrs = sattr;
3958                 data->arg.ftype = ftype;
3959                 data->arg.bitmask = nfs4_bitmask(server, data->label);
3960                 data->res.server = server;
3961                 data->res.fh = &data->fh;
3962                 data->res.fattr = &data->fattr;
3963                 data->res.label = data->label;
3964                 nfs_fattr_init(data->res.fattr);
3965         }
3966         return data;
3967 out_free:
3968         kfree(data);
3969         return NULL;
3970 }
3971
3972 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
3973 {
3974         int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
3975                                     &data->arg.seq_args, &data->res.seq_res, 1);
3976         if (status == 0) {
3977                 update_changeattr(dir, &data->res.dir_cinfo);
3978                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr, data->res.label);
3979         }
3980         return status;
3981 }
3982
3983 static void nfs4_free_createdata(struct nfs4_createdata *data)
3984 {
3985         nfs4_label_free(data->label);
3986         kfree(data);
3987 }
3988
3989 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
3990                 struct page *page, unsigned int len, struct iattr *sattr,
3991                 struct nfs4_label *label)
3992 {
3993         struct nfs4_createdata *data;
3994         int status = -ENAMETOOLONG;
3995
3996         if (len > NFS4_MAXPATHLEN)
3997                 goto out;
3998
3999         status = -ENOMEM;
4000         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
4001         if (data == NULL)
4002                 goto out;
4003
4004         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
4005         data->arg.u.symlink.pages = &page;
4006         data->arg.u.symlink.len = len;
4007         data->arg.label = label;
4008
4009         status = nfs4_do_create(dir, dentry, data);
4010
4011         nfs4_free_createdata(data);
4012 out:
4013         return status;
4014 }
4015
4016 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
4017                 struct page *page, unsigned int len, struct iattr *sattr)
4018 {
4019         struct nfs4_exception exception = { };
4020         struct nfs4_label l, *label = NULL;
4021         int err;
4022
4023         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4024
4025         do {
4026                 err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
4027                 trace_nfs4_symlink(dir, &dentry->d_name, err);
4028                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4029                                 &exception);
4030         } while (exception.retry);
4031
4032         nfs4_label_release_security(label);
4033         return err;
4034 }
4035
4036 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4037                 struct iattr *sattr, struct nfs4_label *label)
4038 {
4039         struct nfs4_createdata *data;
4040         int status = -ENOMEM;
4041
4042         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
4043         if (data == NULL)
4044                 goto out;
4045
4046         data->arg.label = label;
4047         status = nfs4_do_create(dir, dentry, data);
4048
4049         nfs4_free_createdata(data);
4050 out:
4051         return status;
4052 }
4053
4054 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
4055                 struct iattr *sattr)
4056 {
4057         struct nfs4_exception exception = { };
4058         struct nfs4_label l, *label = NULL;
4059         int err;
4060
4061         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4062
4063         sattr->ia_mode &= ~current_umask();
4064         do {
4065                 err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
4066                 trace_nfs4_mkdir(dir, &dentry->d_name, err);
4067                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4068                                 &exception);
4069         } while (exception.retry);
4070         nfs4_label_release_security(label);
4071
4072         return err;
4073 }
4074
4075 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4076                 u64 cookie, struct page **pages, unsigned int count, int plus)
4077 {
4078         struct inode            *dir = d_inode(dentry);
4079         struct nfs4_readdir_arg args = {
4080                 .fh = NFS_FH(dir),
4081                 .pages = pages,
4082                 .pgbase = 0,
4083                 .count = count,
4084                 .bitmask = NFS_SERVER(d_inode(dentry))->attr_bitmask,
4085                 .plus = plus,
4086         };
4087         struct nfs4_readdir_res res;
4088         struct rpc_message msg = {
4089                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
4090                 .rpc_argp = &args,
4091                 .rpc_resp = &res,
4092                 .rpc_cred = cred,
4093         };
4094         int                     status;
4095
4096         dprintk("%s: dentry = %pd2, cookie = %Lu\n", __func__,
4097                         dentry,
4098                         (unsigned long long)cookie);
4099         nfs4_setup_readdir(cookie, NFS_I(dir)->cookieverf, dentry, &args);
4100         res.pgbase = args.pgbase;
4101         status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &msg, &args.seq_args, &res.seq_res, 0);
4102         if (status >= 0) {
4103                 memcpy(NFS_I(dir)->cookieverf, res.verifier.data, NFS4_VERIFIER_SIZE);
4104                 status += args.pgbase;
4105         }
4106
4107         nfs_invalidate_atime(dir);
4108
4109         dprintk("%s: returns %d\n", __func__, status);
4110         return status;
4111 }
4112
4113 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
4114                 u64 cookie, struct page **pages, unsigned int count, int plus)
4115 {
4116         struct nfs4_exception exception = { };
4117         int err;
4118         do {
4119                 err = _nfs4_proc_readdir(dentry, cred, cookie,
4120                                 pages, count, plus);
4121                 trace_nfs4_readdir(d_inode(dentry), err);
4122                 err = nfs4_handle_exception(NFS_SERVER(d_inode(dentry)), err,
4123                                 &exception);
4124         } while (exception.retry);
4125         return err;
4126 }
4127
4128 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4129                 struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
4130 {
4131         struct nfs4_createdata *data;
4132         int mode = sattr->ia_mode;
4133         int status = -ENOMEM;
4134
4135         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
4136         if (data == NULL)
4137                 goto out;
4138
4139         if (S_ISFIFO(mode))
4140                 data->arg.ftype = NF4FIFO;
4141         else if (S_ISBLK(mode)) {
4142                 data->arg.ftype = NF4BLK;
4143                 data->arg.u.device.specdata1 = MAJOR(rdev);
4144                 data->arg.u.device.specdata2 = MINOR(rdev);
4145         }
4146         else if (S_ISCHR(mode)) {
4147                 data->arg.ftype = NF4CHR;
4148                 data->arg.u.device.specdata1 = MAJOR(rdev);
4149                 data->arg.u.device.specdata2 = MINOR(rdev);
4150         } else if (!S_ISSOCK(mode)) {
4151                 status = -EINVAL;
4152                 goto out_free;
4153         }
4154
4155         data->arg.label = label;
4156         status = nfs4_do_create(dir, dentry, data);
4157 out_free:
4158         nfs4_free_createdata(data);
4159 out:
4160         return status;
4161 }
4162
4163 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
4164                 struct iattr *sattr, dev_t rdev)
4165 {
4166         struct nfs4_exception exception = { };
4167         struct nfs4_label l, *label = NULL;
4168         int err;
4169
4170         label = nfs4_label_init_security(dir, dentry, sattr, &l);
4171
4172         sattr->ia_mode &= ~current_umask();
4173         do {
4174                 err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
4175                 trace_nfs4_mknod(dir, &dentry->d_name, err);
4176                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
4177                                 &exception);
4178         } while (exception.retry);
4179
4180         nfs4_label_release_security(label);
4181
4182         return err;
4183 }
4184
4185 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
4186                  struct nfs_fsstat *fsstat)
4187 {
4188         struct nfs4_statfs_arg args = {
4189                 .fh = fhandle,
4190                 .bitmask = server->attr_bitmask,
4191         };
4192         struct nfs4_statfs_res res = {
4193                 .fsstat = fsstat,
4194         };
4195         struct rpc_message msg = {
4196                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
4197                 .rpc_argp = &args,
4198                 .rpc_resp = &res,
4199         };
4200
4201         nfs_fattr_init(fsstat->fattr);
4202         return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4203 }
4204
4205 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
4206 {
4207         struct nfs4_exception exception = { };
4208         int err;
4209         do {
4210                 err = nfs4_handle_exception(server,
4211                                 _nfs4_proc_statfs(server, fhandle, fsstat),
4212                                 &exception);
4213         } while (exception.retry);
4214         return err;
4215 }
4216
4217 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
4218                 struct nfs_fsinfo *fsinfo)
4219 {
4220         struct nfs4_fsinfo_arg args = {
4221                 .fh = fhandle,
4222                 .bitmask = server->attr_bitmask,
4223         };
4224         struct nfs4_fsinfo_res res = {
4225                 .fsinfo = fsinfo,
4226         };
4227         struct rpc_message msg = {
4228                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
4229                 .rpc_argp = &args,
4230                 .rpc_resp = &res,
4231         };
4232
4233         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4234 }
4235
4236 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4237 {
4238         struct nfs4_exception exception = { };
4239         unsigned long now = jiffies;
4240         int err;
4241
4242         do {
4243                 err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
4244                 trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
4245                 if (err == 0) {
4246                         struct nfs_client *clp = server->nfs_client;
4247
4248                         spin_lock(&clp->cl_lock);
4249                         clp->cl_lease_time = fsinfo->lease_time * HZ;
4250                         clp->cl_last_renewal = now;
4251                         spin_unlock(&clp->cl_lock);
4252                         break;
4253                 }
4254                 err = nfs4_handle_exception(server, err, &exception);
4255         } while (exception.retry);
4256         return err;
4257 }
4258
4259 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
4260 {
4261         int error;
4262
4263         nfs_fattr_init(fsinfo->fattr);
4264         error = nfs4_do_fsinfo(server, fhandle, fsinfo);
4265         if (error == 0) {
4266                 /* block layout checks this! */
4267                 server->pnfs_blksize = fsinfo->blksize;
4268                 set_pnfs_layoutdriver(server, fhandle, fsinfo->layouttype);
4269         }
4270
4271         return error;
4272 }
4273
4274 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4275                 struct nfs_pathconf *pathconf)
4276 {
4277         struct nfs4_pathconf_arg args = {
4278                 .fh = fhandle,
4279                 .bitmask = server->attr_bitmask,
4280         };
4281         struct nfs4_pathconf_res res = {
4282                 .pathconf = pathconf,
4283         };
4284         struct rpc_message msg = {
4285                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
4286                 .rpc_argp = &args,
4287                 .rpc_resp = &res,
4288         };
4289
4290         /* None of the pathconf attributes are mandatory to implement */
4291         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
4292                 memset(pathconf, 0, sizeof(*pathconf));
4293                 return 0;
4294         }
4295
4296         nfs_fattr_init(pathconf->fattr);
4297         return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
4298 }
4299
4300 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
4301                 struct nfs_pathconf *pathconf)
4302 {
4303         struct nfs4_exception exception = { };
4304         int err;
4305
4306         do {
4307                 err = nfs4_handle_exception(server,
4308                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
4309                                 &exception);
4310         } while (exception.retry);
4311         return err;
4312 }
4313
4314 int nfs4_set_rw_stateid(nfs4_stateid *stateid,
4315                 const struct nfs_open_context *ctx,
4316                 const struct nfs_lock_context *l_ctx,
4317                 fmode_t fmode)
4318 {
4319         const struct nfs_lockowner *lockowner = NULL;
4320
4321         if (l_ctx != NULL)
4322                 lockowner = &l_ctx->lockowner;
4323         return nfs4_select_rw_stateid(ctx->state, fmode, lockowner, stateid, NULL);
4324 }
4325 EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
4326
4327 static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
4328                 const struct nfs_open_context *ctx,
4329                 const struct nfs_lock_context *l_ctx,
4330                 fmode_t fmode)
4331 {
4332         nfs4_stateid current_stateid;
4333
4334         /* If the current stateid represents a lost lock, then exit */
4335         if (nfs4_set_rw_stateid(&current_stateid, ctx, l_ctx, fmode) == -EIO)
4336                 return true;
4337         return nfs4_stateid_match(stateid, &current_stateid);
4338 }
4339
4340 static bool nfs4_error_stateid_expired(int err)
4341 {
4342         switch (err) {
4343         case -NFS4ERR_DELEG_REVOKED:
4344         case -NFS4ERR_ADMIN_REVOKED:
4345         case -NFS4ERR_BAD_STATEID:
4346         case -NFS4ERR_STALE_STATEID:
4347         case -NFS4ERR_OLD_STATEID:
4348         case -NFS4ERR_OPENMODE:
4349         case -NFS4ERR_EXPIRED:
4350                 return true;
4351         }
4352         return false;
4353 }
4354
4355 void __nfs4_read_done_cb(struct nfs_pgio_header *hdr)
4356 {
4357         nfs_invalidate_atime(hdr->inode);
4358 }
4359
4360 static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
4361 {
4362         struct nfs_server *server = NFS_SERVER(hdr->inode);
4363
4364         trace_nfs4_read(hdr, task->tk_status);
4365         if (nfs4_async_handle_error(task, server,
4366                                     hdr->args.context->state,
4367                                     NULL) == -EAGAIN) {
4368                 rpc_restart_call_prepare(task);
4369                 return -EAGAIN;
4370         }
4371
4372         __nfs4_read_done_cb(hdr);
4373         if (task->tk_status > 0)
4374                 renew_lease(server, hdr->timestamp);
4375         return 0;
4376 }
4377
4378 static bool nfs4_read_stateid_changed(struct rpc_task *task,
4379                 struct nfs_pgio_args *args)
4380 {
4381
4382         if (!nfs4_error_stateid_expired(task->tk_status) ||
4383                 nfs4_stateid_is_current(&args->stateid,
4384                                 args->context,
4385                                 args->lock_context,
4386                                 FMODE_READ))
4387                 return false;
4388         rpc_restart_call_prepare(task);
4389         return true;
4390 }
4391
4392 static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4393 {
4394
4395         dprintk("--> %s\n", __func__);
4396
4397         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4398                 return -EAGAIN;
4399         if (nfs4_read_stateid_changed(task, &hdr->args))
4400                 return -EAGAIN;
4401         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4402                                     nfs4_read_done_cb(task, hdr);
4403 }
4404
4405 static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
4406                                  struct rpc_message *msg)
4407 {
4408         hdr->timestamp   = jiffies;
4409         if (!hdr->pgio_done_cb)
4410                 hdr->pgio_done_cb = nfs4_read_done_cb;
4411         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
4412         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0);
4413 }
4414
4415 static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
4416                                       struct nfs_pgio_header *hdr)
4417 {
4418         if (nfs4_setup_sequence(NFS_SERVER(hdr->inode),
4419                         &hdr->args.seq_args,
4420                         &hdr->res.seq_res,
4421                         task))
4422                 return 0;
4423         if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
4424                                 hdr->args.lock_context,
4425                                 hdr->rw_ops->rw_mode) == -EIO)
4426                 return -EIO;
4427         if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
4428                 return -EIO;
4429         return 0;
4430 }
4431
4432 static int nfs4_write_done_cb(struct rpc_task *task,
4433                               struct nfs_pgio_header *hdr)
4434 {
4435         struct inode *inode = hdr->inode;
4436
4437         trace_nfs4_write(hdr, task->tk_status);
4438         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4439                                     hdr->args.context->state,
4440                                     NULL) == -EAGAIN) {
4441                 rpc_restart_call_prepare(task);
4442                 return -EAGAIN;
4443         }
4444         if (task->tk_status >= 0) {
4445                 renew_lease(NFS_SERVER(inode), hdr->timestamp);
4446                 nfs_writeback_update_inode(hdr);
4447         }
4448         return 0;
4449 }
4450
4451 static bool nfs4_write_stateid_changed(struct rpc_task *task,
4452                 struct nfs_pgio_args *args)
4453 {
4454
4455         if (!nfs4_error_stateid_expired(task->tk_status) ||
4456                 nfs4_stateid_is_current(&args->stateid,
4457                                 args->context,
4458                                 args->lock_context,
4459                                 FMODE_WRITE))
4460                 return false;
4461         rpc_restart_call_prepare(task);
4462         return true;
4463 }
4464
4465 static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
4466 {
4467         if (!nfs4_sequence_done(task, &hdr->res.seq_res))
4468                 return -EAGAIN;
4469         if (nfs4_write_stateid_changed(task, &hdr->args))
4470                 return -EAGAIN;
4471         return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
4472                 nfs4_write_done_cb(task, hdr);
4473 }
4474
4475 static
4476 bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
4477 {
4478         /* Don't request attributes for pNFS or O_DIRECT writes */
4479         if (hdr->ds_clp != NULL || hdr->dreq != NULL)
4480                 return false;
4481         /* Otherwise, request attributes if and only if we don't hold
4482          * a delegation
4483          */
4484         return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
4485 }
4486
4487 static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
4488                                   struct rpc_message *msg)
4489 {
4490         struct nfs_server *server = NFS_SERVER(hdr->inode);
4491
4492         if (!nfs4_write_need_cache_consistency_data(hdr)) {
4493                 hdr->args.bitmask = NULL;
4494                 hdr->res.fattr = NULL;
4495         } else
4496                 hdr->args.bitmask = server->cache_consistency_bitmask;
4497
4498         if (!hdr->pgio_done_cb)
4499                 hdr->pgio_done_cb = nfs4_write_done_cb;
4500         hdr->res.server = server;
4501         hdr->timestamp   = jiffies;
4502
4503         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
4504         nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 1);
4505 }
4506
4507 static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
4508 {
4509         nfs4_setup_sequence(NFS_SERVER(data->inode),
4510                         &data->args.seq_args,
4511                         &data->res.seq_res,
4512                         task);
4513 }
4514
4515 static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
4516 {
4517         struct inode *inode = data->inode;
4518
4519         trace_nfs4_commit(data, task->tk_status);
4520         if (nfs4_async_handle_error(task, NFS_SERVER(inode),
4521                                     NULL, NULL) == -EAGAIN) {
4522                 rpc_restart_call_prepare(task);
4523                 return -EAGAIN;
4524         }
4525         return 0;
4526 }
4527
4528 static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
4529 {
4530         if (!nfs4_sequence_done(task, &data->res.seq_res))
4531                 return -EAGAIN;
4532         return data->commit_done_cb(task, data);
4533 }
4534
4535 static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg)
4536 {
4537         struct nfs_server *server = NFS_SERVER(data->inode);
4538
4539         if (data->commit_done_cb == NULL)
4540                 data->commit_done_cb = nfs4_commit_done_cb;
4541         data->res.server = server;
4542         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
4543         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
4544 }
4545
4546 struct nfs4_renewdata {
4547         struct nfs_client       *client;
4548         unsigned long           timestamp;
4549 };
4550
4551 /*
4552  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
4553  * standalone procedure for queueing an asynchronous RENEW.
4554  */
4555 static void nfs4_renew_release(void *calldata)
4556 {
4557         struct nfs4_renewdata *data = calldata;
4558         struct nfs_client *clp = data->client;
4559
4560         if (atomic_read(&clp->cl_count) > 1)
4561                 nfs4_schedule_state_renewal(clp);
4562         nfs_put_client(clp);
4563         kfree(data);
4564 }
4565
4566 static void nfs4_renew_done(struct rpc_task *task, void *calldata)
4567 {
4568         struct nfs4_renewdata *data = calldata;
4569         struct nfs_client *clp = data->client;
4570         unsigned long timestamp = data->timestamp;
4571
4572         trace_nfs4_renew_async(clp, task->tk_status);
4573         switch (task->tk_status) {
4574         case 0:
4575                 break;
4576         case -NFS4ERR_LEASE_MOVED:
4577                 nfs4_schedule_lease_moved_recovery(clp);
4578                 break;
4579         default:
4580                 /* Unless we're shutting down, schedule state recovery! */
4581                 if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
4582                         return;
4583                 if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
4584                         nfs4_schedule_lease_recovery(clp);
4585                         return;
4586                 }
4587                 nfs4_schedule_path_down_recovery(clp);
4588         }
4589         do_renew_lease(clp, timestamp);
4590 }
4591
4592 static const struct rpc_call_ops nfs4_renew_ops = {
4593         .rpc_call_done = nfs4_renew_done,
4594         .rpc_release = nfs4_renew_release,
4595 };
4596
4597 static int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
4598 {
4599         struct rpc_message msg = {
4600                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4601                 .rpc_argp       = clp,
4602                 .rpc_cred       = cred,
4603         };
4604         struct nfs4_renewdata *data;
4605
4606         if (renew_flags == 0)
4607                 return 0;
4608         if (!atomic_inc_not_zero(&clp->cl_count))
4609                 return -EIO;
4610         data = kmalloc(sizeof(*data), GFP_NOFS);
4611         if (data == NULL)
4612                 return -ENOMEM;
4613         data->client = clp;
4614         data->timestamp = jiffies;
4615         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
4616                         &nfs4_renew_ops, data);
4617 }
4618
4619 static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
4620 {
4621         struct rpc_message msg = {
4622                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
4623                 .rpc_argp       = clp,
4624                 .rpc_cred       = cred,
4625         };
4626         unsigned long now = jiffies;
4627         int status;
4628
4629         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
4630         if (status < 0)
4631                 return status;
4632         do_renew_lease(clp, now);
4633         return 0;
4634 }
4635
4636 static inline int nfs4_server_supports_acls(struct nfs_server *server)
4637 {
4638         return server->caps & NFS_CAP_ACLS;
4639 }
4640
4641 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
4642  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
4643  * the stack.
4644  */
4645 #define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
4646
4647 static int buf_to_pages_noslab(const void *buf, size_t buflen,
4648                 struct page **pages)
4649 {
4650         struct page *newpage, **spages;
4651         int rc = 0;
4652         size_t len;
4653         spages = pages;
4654
4655         do {
4656                 len = min_t(size_t, PAGE_SIZE, buflen);
4657                 newpage = alloc_page(GFP_KERNEL);
4658
4659                 if (newpage == NULL)
4660                         goto unwind;
4661                 memcpy(page_address(newpage), buf, len);
4662                 buf += len;
4663                 buflen -= len;
4664                 *pages++ = newpage;
4665                 rc++;
4666         } while (buflen != 0);
4667
4668         return rc;
4669
4670 unwind:
4671         for(; rc > 0; rc--)
4672                 __free_page(spages[rc-1]);
4673         return -ENOMEM;
4674 }
4675
4676 struct nfs4_cached_acl {
4677         int cached;
4678         size_t len;
4679         char data[0];
4680 };
4681
4682 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
4683 {
4684         struct nfs_inode *nfsi = NFS_I(inode);
4685
4686         spin_lock(&inode->i_lock);
4687         kfree(nfsi->nfs4_acl);
4688         nfsi->nfs4_acl = acl;
4689         spin_unlock(&inode->i_lock);
4690 }
4691
4692 static void nfs4_zap_acl_attr(struct inode *inode)
4693 {
4694         nfs4_set_cached_acl(inode, NULL);
4695 }
4696
4697 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
4698 {
4699         struct nfs_inode *nfsi = NFS_I(inode);
4700         struct nfs4_cached_acl *acl;
4701         int ret = -ENOENT;
4702
4703         spin_lock(&inode->i_lock);
4704         acl = nfsi->nfs4_acl;
4705         if (acl == NULL)
4706                 goto out;
4707         if (buf == NULL) /* user is just asking for length */
4708                 goto out_len;
4709         if (acl->cached == 0)
4710                 goto out;
4711         ret = -ERANGE; /* see getxattr(2) man page */
4712         if (acl->len > buflen)
4713                 goto out;
4714         memcpy(buf, acl->data, acl->len);
4715 out_len:
4716         ret = acl->len;
4717 out:
4718         spin_unlock(&inode->i_lock);
4719         return ret;
4720 }
4721
4722 static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
4723 {
4724         struct nfs4_cached_acl *acl;
4725         size_t buflen = sizeof(*acl) + acl_len;
4726
4727         if (buflen <= PAGE_SIZE) {
4728                 acl = kmalloc(buflen, GFP_KERNEL);
4729                 if (acl == NULL)
4730                         goto out;
4731                 acl->cached = 1;
4732                 _copy_from_pages(acl->data, pages, pgbase, acl_len);
4733         } else {
4734                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
4735                 if (acl == NULL)
4736                         goto out;
4737                 acl->cached = 0;
4738         }
4739         acl->len = acl_len;
4740 out:
4741         nfs4_set_cached_acl(inode, acl);
4742 }
4743
4744 /*
4745  * The getxattr API returns the required buffer length when called with a
4746  * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
4747  * the required buf.  On a NULL buf, we send a page of data to the server
4748  * guessing that the ACL request can be serviced by a page. If so, we cache
4749  * up to the page of ACL data, and the 2nd call to getxattr is serviced by
4750  * the cache. If not so, we throw away the page, and cache the required
4751  * length. The next getxattr call will then produce another round trip to
4752  * the server, this time with the input buf of the required size.
4753  */
4754 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4755 {
4756         struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
4757         struct nfs_getaclargs args = {
4758                 .fh = NFS_FH(inode),
4759                 .acl_pages = pages,
4760                 .acl_len = buflen,
4761         };
4762         struct nfs_getaclres res = {
4763                 .acl_len = buflen,
4764         };
4765         struct rpc_message msg = {
4766                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
4767                 .rpc_argp = &args,
4768                 .rpc_resp = &res,
4769         };
4770         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4771         int ret = -ENOMEM, i;
4772
4773         /* As long as we're doing a round trip to the server anyway,
4774          * let's be prepared for a page of acl data. */
4775         if (npages == 0)
4776                 npages = 1;
4777         if (npages > ARRAY_SIZE(pages))
4778                 return -ERANGE;
4779
4780         for (i = 0; i < npages; i++) {
4781                 pages[i] = alloc_page(GFP_KERNEL);
4782                 if (!pages[i])
4783                         goto out_free;
4784         }
4785
4786         /* for decoding across pages */
4787         res.acl_scratch = alloc_page(GFP_KERNEL);
4788         if (!res.acl_scratch)
4789                 goto out_free;
4790
4791         args.acl_len = npages * PAGE_SIZE;
4792
4793         dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
4794                 __func__, buf, buflen, npages, args.acl_len);
4795         ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
4796                              &msg, &args.seq_args, &res.seq_res, 0);
4797         if (ret)
4798                 goto out_free;
4799
4800         /* Handle the case where the passed-in buffer is too short */
4801         if (res.acl_flags & NFS4_ACL_TRUNC) {
4802                 /* Did the user only issue a request for the acl length? */
4803                 if (buf == NULL)
4804                         goto out_ok;
4805                 ret = -ERANGE;
4806                 goto out_free;
4807         }
4808         nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
4809         if (buf) {
4810                 if (res.acl_len > buflen) {
4811                         ret = -ERANGE;
4812                         goto out_free;
4813                 }
4814                 _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
4815         }
4816 out_ok:
4817         ret = res.acl_len;
4818 out_free:
4819         for (i = 0; i < npages; i++)
4820                 if (pages[i])
4821                         __free_page(pages[i]);
4822         if (res.acl_scratch)
4823                 __free_page(res.acl_scratch);
4824         return ret;
4825 }
4826
4827 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
4828 {
4829         struct nfs4_exception exception = { };
4830         ssize_t ret;
4831         do {
4832                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
4833                 trace_nfs4_get_acl(inode, ret);
4834                 if (ret >= 0)
4835                         break;
4836                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
4837         } while (exception.retry);
4838         return ret;
4839 }
4840
4841 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
4842 {
4843         struct nfs_server *server = NFS_SERVER(inode);
4844         int ret;
4845
4846         if (!nfs4_server_supports_acls(server))
4847                 return -EOPNOTSUPP;
4848         ret = nfs_revalidate_inode(server, inode);
4849         if (ret < 0)
4850                 return ret;
4851         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
4852                 nfs_zap_acl_cache(inode);
4853         ret = nfs4_read_cached_acl(inode, buf, buflen);
4854         if (ret != -ENOENT)
4855                 /* -ENOENT is returned if there is no ACL or if there is an ACL
4856                  * but no cached acl data, just the acl length */
4857                 return ret;
4858         return nfs4_get_acl_uncached(inode, buf, buflen);
4859 }
4860
4861 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4862 {
4863         struct nfs_server *server = NFS_SERVER(inode);
4864         struct page *pages[NFS4ACL_MAXPAGES];
4865         struct nfs_setaclargs arg = {
4866                 .fh             = NFS_FH(inode),
4867                 .acl_pages      = pages,
4868                 .acl_len        = buflen,
4869         };
4870         struct nfs_setaclres res;
4871         struct rpc_message msg = {
4872                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
4873                 .rpc_argp       = &arg,
4874                 .rpc_resp       = &res,
4875         };
4876         unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
4877         int ret, i;
4878
4879         if (!nfs4_server_supports_acls(server))
4880                 return -EOPNOTSUPP;
4881         if (npages > ARRAY_SIZE(pages))
4882                 return -ERANGE;
4883         i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
4884         if (i < 0)
4885                 return i;
4886         nfs4_inode_return_delegation(inode);
4887         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
4888
4889         /*
4890          * Free each page after tx, so the only ref left is
4891          * held by the network stack
4892          */
4893         for (; i > 0; i--)
4894                 put_page(pages[i-1]);
4895
4896         /*
4897          * Acl update can result in inode attribute update.
4898          * so mark the attribute cache invalid.
4899          */
4900         spin_lock(&inode->i_lock);
4901         NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
4902         spin_unlock(&inode->i_lock);
4903         nfs_access_zap_cache(inode);
4904         nfs_zap_acl_cache(inode);
4905         return ret;
4906 }
4907
4908 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
4909 {
4910         struct nfs4_exception exception = { };
4911         int err;
4912         do {
4913                 err = __nfs4_proc_set_acl(inode, buf, buflen);
4914                 trace_nfs4_set_acl(inode, err);
4915                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4916                                 &exception);
4917         } while (exception.retry);
4918         return err;
4919 }
4920
4921 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
4922 static int _nfs4_get_security_label(struct inode *inode, void *buf,
4923                                         size_t buflen)
4924 {
4925         struct nfs_server *server = NFS_SERVER(inode);
4926         struct nfs_fattr fattr;
4927         struct nfs4_label label = {0, 0, buflen, buf};
4928
4929         u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4930         struct nfs4_getattr_arg arg = {
4931                 .fh             = NFS_FH(inode),
4932                 .bitmask        = bitmask,
4933         };
4934         struct nfs4_getattr_res res = {
4935                 .fattr          = &fattr,
4936                 .label          = &label,
4937                 .server         = server,
4938         };
4939         struct rpc_message msg = {
4940                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
4941                 .rpc_argp       = &arg,
4942                 .rpc_resp       = &res,
4943         };
4944         int ret;
4945
4946         nfs_fattr_init(&fattr);
4947
4948         ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
4949         if (ret)
4950                 return ret;
4951         if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
4952                 return -ENOENT;
4953         if (buflen < label.len)
4954                 return -ERANGE;
4955         return 0;
4956 }
4957
4958 static int nfs4_get_security_label(struct inode *inode, void *buf,
4959                                         size_t buflen)
4960 {
4961         struct nfs4_exception exception = { };
4962         int err;
4963
4964         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
4965                 return -EOPNOTSUPP;
4966
4967         do {
4968                 err = _nfs4_get_security_label(inode, buf, buflen);
4969                 trace_nfs4_get_security_label(inode, err);
4970                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
4971                                 &exception);
4972         } while (exception.retry);
4973         return err;
4974 }
4975
4976 static int _nfs4_do_set_security_label(struct inode *inode,
4977                 struct nfs4_label *ilabel,
4978                 struct nfs_fattr *fattr,
4979                 struct nfs4_label *olabel)
4980 {
4981
4982         struct iattr sattr = {0};
4983         struct nfs_server *server = NFS_SERVER(inode);
4984         const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
4985         struct nfs_setattrargs arg = {
4986                 .fh             = NFS_FH(inode),
4987                 .iap            = &sattr,
4988                 .server         = server,
4989                 .bitmask        = bitmask,
4990                 .label          = ilabel,
4991         };
4992         struct nfs_setattrres res = {
4993                 .fattr          = fattr,
4994                 .label          = olabel,
4995                 .server         = server,
4996         };
4997         struct rpc_message msg = {
4998                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
4999                 .rpc_argp       = &arg,
5000                 .rpc_resp       = &res,
5001         };
5002         int status;
5003
5004         nfs4_stateid_copy(&arg.stateid, &zero_stateid);
5005
5006         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5007         if (status)
5008                 dprintk("%s failed: %d\n", __func__, status);
5009
5010         return status;
5011 }
5012
5013 static int nfs4_do_set_security_label(struct inode *inode,
5014                 struct nfs4_label *ilabel,
5015                 struct nfs_fattr *fattr,
5016                 struct nfs4_label *olabel)
5017 {
5018         struct nfs4_exception exception = { };
5019         int err;
5020
5021         do {
5022                 err = _nfs4_do_set_security_label(inode, ilabel,
5023                                 fattr, olabel);
5024                 trace_nfs4_set_security_label(inode, err);
5025                 err = nfs4_handle_exception(NFS_SERVER(inode), err,
5026                                 &exception);
5027         } while (exception.retry);
5028         return err;
5029 }
5030
5031 static int
5032 nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
5033 {
5034         struct nfs4_label ilabel, *olabel = NULL;
5035         struct nfs_fattr fattr;
5036         struct rpc_cred *cred;
5037         int status;
5038
5039         if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
5040                 return -EOPNOTSUPP;
5041
5042         nfs_fattr_init(&fattr);
5043
5044         ilabel.pi = 0;
5045         ilabel.lfs = 0;
5046         ilabel.label = (char *)buf;
5047         ilabel.len = buflen;
5048
5049         cred = rpc_lookup_cred();
5050         if (IS_ERR(cred))
5051                 return PTR_ERR(cred);
5052
5053         olabel = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
5054         if (IS_ERR(olabel)) {
5055                 status = -PTR_ERR(olabel);
5056                 goto out;
5057         }
5058
5059         status = nfs4_do_set_security_label(inode, &ilabel, &fattr, olabel);
5060         if (status == 0)
5061                 nfs_setsecurity(inode, &fattr, olabel);
5062
5063         nfs4_label_free(olabel);
5064 out:
5065         put_rpccred(cred);
5066         return status;
5067 }
5068 #endif  /* CONFIG_NFS_V4_SECURITY_LABEL */
5069
5070
5071 static void nfs4_init_boot_verifier(const struct nfs_client *clp,
5072                                     nfs4_verifier *bootverf)
5073 {
5074         __be32 verf[2];
5075
5076         if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
5077                 /* An impossible timestamp guarantees this value
5078                  * will never match a generated boot time. */
5079                 verf[0] = 0;
5080                 verf[1] = cpu_to_be32(NSEC_PER_SEC + 1);
5081         } else {
5082                 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
5083                 verf[0] = cpu_to_be32(nn->boot_time.tv_sec);
5084                 verf[1] = cpu_to_be32(nn->boot_time.tv_nsec);
5085         }
5086         memcpy(bootverf->data, verf, sizeof(bootverf->data));
5087 }
5088
5089 static int
5090 nfs4_init_nonuniform_client_string(struct nfs_client *clp)
5091 {
5092         size_t len;
5093         char *str;
5094
5095         if (clp->cl_owner_id != NULL)
5096                 return 0;
5097
5098         rcu_read_lock();
5099         len = 14 + strlen(clp->cl_ipaddr) + 1 +
5100                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
5101                 1 +
5102                 strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO)) +
5103                 1;
5104         rcu_read_unlock();
5105
5106         if (len > NFS4_OPAQUE_LIMIT + 1)
5107                 return -EINVAL;
5108
5109         /*
5110          * Since this string is allocated at mount time, and held until the
5111          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5112          * about a memory-reclaim deadlock.
5113          */
5114         str = kmalloc(len, GFP_KERNEL);
5115         if (!str)
5116                 return -ENOMEM;
5117
5118         rcu_read_lock();
5119         scnprintf(str, len, "Linux NFSv4.0 %s/%s %s",
5120                         clp->cl_ipaddr,
5121                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR),
5122                         rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_PROTO));
5123         rcu_read_unlock();
5124
5125         clp->cl_owner_id = str;
5126         return 0;
5127 }
5128
5129 static int
5130 nfs4_init_uniquifier_client_string(struct nfs_client *clp)
5131 {
5132         size_t len;
5133         char *str;
5134
5135         len = 10 + 10 + 1 + 10 + 1 +
5136                 strlen(nfs4_client_id_uniquifier) + 1 +
5137                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5138
5139         if (len > NFS4_OPAQUE_LIMIT + 1)
5140                 return -EINVAL;
5141
5142         /*
5143          * Since this string is allocated at mount time, and held until the
5144          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5145          * about a memory-reclaim deadlock.
5146          */
5147         str = kmalloc(len, GFP_KERNEL);
5148         if (!str)
5149                 return -ENOMEM;
5150
5151         scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
5152                         clp->rpc_ops->version, clp->cl_minorversion,
5153                         nfs4_client_id_uniquifier,
5154                         clp->cl_rpcclient->cl_nodename);
5155         clp->cl_owner_id = str;
5156         return 0;
5157 }
5158
5159 static int
5160 nfs4_init_uniform_client_string(struct nfs_client *clp)
5161 {
5162         size_t len;
5163         char *str;
5164
5165         if (clp->cl_owner_id != NULL)
5166                 return 0;
5167
5168         if (nfs4_client_id_uniquifier[0] != '\0')
5169                 return nfs4_init_uniquifier_client_string(clp);
5170
5171         len = 10 + 10 + 1 + 10 + 1 +
5172                 strlen(clp->cl_rpcclient->cl_nodename) + 1;
5173
5174         if (len > NFS4_OPAQUE_LIMIT + 1)
5175                 return -EINVAL;
5176
5177         /*
5178          * Since this string is allocated at mount time, and held until the
5179          * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
5180          * about a memory-reclaim deadlock.
5181          */
5182         str = kmalloc(len, GFP_KERNEL);
5183         if (!str)
5184                 return -ENOMEM;
5185
5186         scnprintf(str, len, "Linux NFSv%u.%u %s",
5187                         clp->rpc_ops->version, clp->cl_minorversion,
5188                         clp->cl_rpcclient->cl_nodename);
5189         clp->cl_owner_id = str;
5190         return 0;
5191 }
5192
5193 /*
5194  * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
5195  * services.  Advertise one based on the address family of the
5196  * clientaddr.
5197  */
5198 static unsigned int
5199 nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
5200 {
5201         if (strchr(clp->cl_ipaddr, ':') != NULL)
5202                 return scnprintf(buf, len, "tcp6");
5203         else
5204                 return scnprintf(buf, len, "tcp");
5205 }
5206
5207 static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
5208 {
5209         struct nfs4_setclientid *sc = calldata;
5210
5211         if (task->tk_status == 0)
5212                 sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
5213 }
5214
5215 static const struct rpc_call_ops nfs4_setclientid_ops = {
5216         .rpc_call_done = nfs4_setclientid_done,
5217 };
5218
5219 /**
5220  * nfs4_proc_setclientid - Negotiate client ID
5221  * @clp: state data structure
5222  * @program: RPC program for NFSv4 callback service
5223  * @port: IP port number for NFS4 callback service
5224  * @cred: RPC credential to use for this call
5225  * @res: where to place the result
5226  *
5227  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5228  */
5229 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
5230                 unsigned short port, struct rpc_cred *cred,
5231                 struct nfs4_setclientid_res *res)
5232 {
5233         nfs4_verifier sc_verifier;
5234         struct nfs4_setclientid setclientid = {
5235                 .sc_verifier = &sc_verifier,
5236                 .sc_prog = program,
5237                 .sc_clnt = clp,
5238         };
5239         struct rpc_message msg = {
5240                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
5241                 .rpc_argp = &setclientid,
5242                 .rpc_resp = res,
5243                 .rpc_cred = cred,
5244         };
5245         struct rpc_task *task;
5246         struct rpc_task_setup task_setup_data = {
5247                 .rpc_client = clp->cl_rpcclient,
5248                 .rpc_message = &msg,
5249                 .callback_ops = &nfs4_setclientid_ops,
5250                 .callback_data = &setclientid,
5251                 .flags = RPC_TASK_TIMEOUT,
5252         };
5253         int status;
5254
5255         /* nfs_client_id4 */
5256         nfs4_init_boot_verifier(clp, &sc_verifier);
5257
5258         if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
5259                 status = nfs4_init_uniform_client_string(clp);
5260         else
5261                 status = nfs4_init_nonuniform_client_string(clp);
5262
5263         if (status)
5264                 goto out;
5265
5266         /* cb_client4 */
5267         setclientid.sc_netid_len =
5268                                 nfs4_init_callback_netid(clp,
5269                                                 setclientid.sc_netid,
5270                                                 sizeof(setclientid.sc_netid));
5271         setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
5272                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
5273                                 clp->cl_ipaddr, port >> 8, port & 255);
5274
5275         dprintk("NFS call  setclientid auth=%s, '%s'\n",
5276                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5277                 clp->cl_owner_id);
5278         task = rpc_run_task(&task_setup_data);
5279         if (IS_ERR(task)) {
5280                 status = PTR_ERR(task);
5281                 goto out;
5282         }
5283         status = task->tk_status;
5284         if (setclientid.sc_cred) {
5285                 clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
5286                 put_rpccred(setclientid.sc_cred);
5287         }
5288         rpc_put_task(task);
5289 out:
5290         trace_nfs4_setclientid(clp, status);
5291         dprintk("NFS reply setclientid: %d\n", status);
5292         return status;
5293 }
5294
5295 /**
5296  * nfs4_proc_setclientid_confirm - Confirm client ID
5297  * @clp: state data structure
5298  * @res: result of a previous SETCLIENTID
5299  * @cred: RPC credential to use for this call
5300  *
5301  * Returns zero, a negative errno, or a negative NFS4ERR status code.
5302  */
5303 int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
5304                 struct nfs4_setclientid_res *arg,
5305                 struct rpc_cred *cred)
5306 {
5307         struct rpc_message msg = {
5308                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
5309                 .rpc_argp = arg,
5310                 .rpc_cred = cred,
5311         };
5312         int status;
5313
5314         dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
5315                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
5316                 clp->cl_clientid);
5317         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
5318         trace_nfs4_setclientid_confirm(clp, status);
5319         dprintk("NFS reply setclientid_confirm: %d\n", status);
5320         return status;
5321 }
5322
5323 struct nfs4_delegreturndata {
5324         struct nfs4_delegreturnargs args;
5325         struct nfs4_delegreturnres res;
5326         struct nfs_fh fh;
5327         nfs4_stateid stateid;
5328         unsigned long timestamp;
5329         struct nfs_fattr fattr;
5330         int rpc_status;
5331         struct inode *inode;
5332         bool roc;
5333         u32 roc_barrier;
5334 };
5335
5336 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
5337 {
5338         struct nfs4_delegreturndata *data = calldata;
5339
5340         if (!nfs4_sequence_done(task, &data->res.seq_res))
5341                 return;
5342
5343         trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
5344         switch (task->tk_status) {
5345         case 0:
5346                 renew_lease(data->res.server, data->timestamp);
5347         case -NFS4ERR_ADMIN_REVOKED:
5348         case -NFS4ERR_DELEG_REVOKED:
5349         case -NFS4ERR_BAD_STATEID:
5350         case -NFS4ERR_OLD_STATEID:
5351         case -NFS4ERR_STALE_STATEID:
5352         case -NFS4ERR_EXPIRED:
5353                 task->tk_status = 0;
5354                 if (data->roc)
5355                         pnfs_roc_set_barrier(data->inode, data->roc_barrier);
5356                 break;
5357         default:
5358                 if (nfs4_async_handle_error(task, data->res.server,
5359                                             NULL, NULL) == -EAGAIN) {
5360                         rpc_restart_call_prepare(task);
5361                         return;
5362                 }
5363         }
5364         data->rpc_status = task->tk_status;
5365 }
5366
5367 static void nfs4_delegreturn_release(void *calldata)
5368 {
5369         struct nfs4_delegreturndata *data = calldata;
5370         struct inode *inode = data->inode;
5371
5372         if (inode) {
5373                 if (data->roc)
5374                         pnfs_roc_release(inode);
5375                 nfs_iput_and_deactive(inode);
5376         }
5377         kfree(calldata);
5378 }
5379
5380 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
5381 {
5382         struct nfs4_delegreturndata *d_data;
5383
5384         d_data = (struct nfs4_delegreturndata *)data;
5385
5386         if (nfs4_wait_on_layoutreturn(d_data->inode, task))
5387                 return;
5388
5389         if (d_data->roc)
5390                 pnfs_roc_get_barrier(d_data->inode, &d_data->roc_barrier);
5391
5392         nfs4_setup_sequence(d_data->res.server,
5393                         &d_data->args.seq_args,
5394                         &d_data->res.seq_res,
5395                         task);
5396 }
5397
5398 static const struct rpc_call_ops nfs4_delegreturn_ops = {
5399         .rpc_call_prepare = nfs4_delegreturn_prepare,
5400         .rpc_call_done = nfs4_delegreturn_done,
5401         .rpc_release = nfs4_delegreturn_release,
5402 };
5403
5404 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5405 {
5406         struct nfs4_delegreturndata *data;
5407         struct nfs_server *server = NFS_SERVER(inode);
5408         struct rpc_task *task;
5409         struct rpc_message msg = {
5410                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
5411                 .rpc_cred = cred,
5412         };
5413         struct rpc_task_setup task_setup_data = {
5414                 .rpc_client = server->client,
5415                 .rpc_message = &msg,
5416                 .callback_ops = &nfs4_delegreturn_ops,
5417                 .flags = RPC_TASK_ASYNC,
5418         };
5419         int status = 0;
5420
5421         data = kzalloc(sizeof(*data), GFP_NOFS);
5422         if (data == NULL)
5423                 return -ENOMEM;
5424         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
5425
5426         nfs4_state_protect(server->nfs_client,
5427                         NFS_SP4_MACH_CRED_CLEANUP,
5428                         &task_setup_data.rpc_client, &msg);
5429
5430         data->args.fhandle = &data->fh;
5431         data->args.stateid = &data->stateid;
5432         data->args.bitmask = server->cache_consistency_bitmask;
5433         nfs_copy_fh(&data->fh, NFS_FH(inode));
5434         nfs4_stateid_copy(&data->stateid, stateid);
5435         data->res.fattr = &data->fattr;
5436         data->res.server = server;
5437         nfs_fattr_init(data->res.fattr);
5438         data->timestamp = jiffies;
5439         data->rpc_status = 0;
5440         data->inode = nfs_igrab_and_active(inode);
5441         if (data->inode)
5442                 data->roc = nfs4_roc(inode);
5443
5444         task_setup_data.callback_data = data;
5445         msg.rpc_argp = &data->args;
5446         msg.rpc_resp = &data->res;
5447         task = rpc_run_task(&task_setup_data);
5448         if (IS_ERR(task))
5449                 return PTR_ERR(task);
5450         if (!issync)
5451                 goto out;
5452         status = nfs4_wait_for_completion_rpc_task(task);
5453         if (status != 0)
5454                 goto out;
5455         status = data->rpc_status;
5456         if (status == 0)
5457                 nfs_post_op_update_inode_force_wcc(inode, &data->fattr);
5458         else
5459                 nfs_refresh_inode(inode, &data->fattr);
5460 out:
5461         rpc_put_task(task);
5462         return status;
5463 }
5464
5465 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
5466 {
5467         struct nfs_server *server = NFS_SERVER(inode);
5468         struct nfs4_exception exception = { };
5469         int err;
5470         do {
5471                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
5472                 trace_nfs4_delegreturn(inode, stateid, err);
5473                 switch (err) {
5474                         case -NFS4ERR_STALE_STATEID:
5475                         case -NFS4ERR_EXPIRED:
5476                         case 0:
5477                                 return 0;
5478                 }
5479                 err = nfs4_handle_exception(server, err, &exception);
5480         } while (exception.retry);
5481         return err;
5482 }
5483
5484 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
5485 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
5486
5487 /*
5488  * sleep, with exponential backoff, and retry the LOCK operation.
5489  */
5490 static unsigned long
5491 nfs4_set_lock_task_retry(unsigned long timeout)
5492 {
5493         freezable_schedule_timeout_killable_unsafe(timeout);
5494         timeout <<= 1;
5495         if (timeout > NFS4_LOCK_MAXTIMEOUT)
5496                 return NFS4_LOCK_MAXTIMEOUT;
5497         return timeout;
5498 }
5499
5500 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5501 {
5502         struct inode *inode = state->inode;
5503         struct nfs_server *server = NFS_SERVER(inode);
5504         struct nfs_client *clp = server->nfs_client;
5505         struct nfs_lockt_args arg = {
5506                 .fh = NFS_FH(inode),
5507                 .fl = request,
5508         };
5509         struct nfs_lockt_res res = {
5510                 .denied = request,
5511         };
5512         struct rpc_message msg = {
5513                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
5514                 .rpc_argp       = &arg,
5515                 .rpc_resp       = &res,
5516                 .rpc_cred       = state->owner->so_cred,
5517         };
5518         struct nfs4_lock_state *lsp;
5519         int status;
5520
5521         arg.lock_owner.clientid = clp->cl_clientid;
5522         status = nfs4_set_lock_state(state, request);
5523         if (status != 0)
5524                 goto out;
5525         lsp = request->fl_u.nfs4_fl.owner;
5526         arg.lock_owner.id = lsp->ls_seqid.owner_id;
5527         arg.lock_owner.s_dev = server->s_dev;
5528         status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
5529         switch (status) {
5530                 case 0:
5531                         request->fl_type = F_UNLCK;
5532                         break;
5533                 case -NFS4ERR_DENIED:
5534                         status = 0;
5535         }
5536         request->fl_ops->fl_release_private(request);
5537         request->fl_ops = NULL;
5538 out:
5539         return status;
5540 }
5541
5542 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
5543 {
5544         struct nfs4_exception exception = { };
5545         int err;
5546
5547         do {
5548                 err = _nfs4_proc_getlk(state, cmd, request);
5549                 trace_nfs4_get_lock(request, state, cmd, err);
5550                 err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
5551                                 &exception);
5552         } while (exception.retry);
5553         return err;
5554 }
5555
5556 static int do_vfs_lock(struct inode *inode, struct file_lock *fl)
5557 {
5558         return locks_lock_inode_wait(inode, fl);
5559 }
5560
5561 struct nfs4_unlockdata {
5562         struct nfs_locku_args arg;
5563         struct nfs_locku_res res;
5564         struct nfs4_lock_state *lsp;
5565         struct nfs_open_context *ctx;
5566         struct file_lock fl;
5567         struct nfs_server *server;
5568         unsigned long timestamp;
5569 };
5570
5571 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
5572                 struct nfs_open_context *ctx,
5573                 struct nfs4_lock_state *lsp,
5574                 struct nfs_seqid *seqid)
5575 {
5576         struct nfs4_unlockdata *p;
5577         struct inode *inode = lsp->ls_state->inode;
5578
5579         p = kzalloc(sizeof(*p), GFP_NOFS);
5580         if (p == NULL)
5581                 return NULL;
5582         p->arg.fh = NFS_FH(inode);
5583         p->arg.fl = &p->fl;
5584         p->arg.seqid = seqid;
5585         p->res.seqid = seqid;
5586         p->lsp = lsp;
5587         atomic_inc(&lsp->ls_count);
5588         /* Ensure we don't close file until we're done freeing locks! */
5589         p->ctx = get_nfs_open_context(ctx);
5590         memcpy(&p->fl, fl, sizeof(p->fl));
5591         p->server = NFS_SERVER(inode);
5592         return p;
5593 }
5594
5595 static void nfs4_locku_release_calldata(void *data)
5596 {
5597         struct nfs4_unlockdata *calldata = data;
5598         nfs_free_seqid(calldata->arg.seqid);
5599         nfs4_put_lock_state(calldata->lsp);
5600         put_nfs_open_context(calldata->ctx);
5601         kfree(calldata);
5602 }
5603
5604 static void nfs4_locku_done(struct rpc_task *task, void *data)
5605 {
5606         struct nfs4_unlockdata *calldata = data;
5607
5608         if (!nfs4_sequence_done(task, &calldata->res.seq_res))
5609                 return;
5610         switch (task->tk_status) {
5611                 case 0:
5612                         renew_lease(calldata->server, calldata->timestamp);
5613                         do_vfs_lock(calldata->lsp->ls_state->inode, &calldata->fl);
5614                         if (nfs4_update_lock_stateid(calldata->lsp,
5615                                         &calldata->res.stateid))
5616                                 break;
5617                 case -NFS4ERR_BAD_STATEID:
5618                 case -NFS4ERR_OLD_STATEID:
5619                 case -NFS4ERR_STALE_STATEID:
5620                 case -NFS4ERR_EXPIRED:
5621                         if (!nfs4_stateid_match(&calldata->arg.stateid,
5622                                                 &calldata->lsp->ls_stateid))
5623                                 rpc_restart_call_prepare(task);
5624                         break;
5625                 default:
5626                         if (nfs4_async_handle_error(task, calldata->server,
5627                                                     NULL, NULL) == -EAGAIN)
5628                                 rpc_restart_call_prepare(task);
5629         }
5630         nfs_release_seqid(calldata->arg.seqid);
5631 }
5632
5633 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
5634 {
5635         struct nfs4_unlockdata *calldata = data;
5636
5637         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
5638                 goto out_wait;
5639         nfs4_stateid_copy(&calldata->arg.stateid, &calldata->lsp->ls_stateid);
5640         if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
5641                 /* Note: exit _without_ running nfs4_locku_done */
5642                 goto out_no_action;
5643         }
5644         calldata->timestamp = jiffies;
5645         if (nfs4_setup_sequence(calldata->server,
5646                                 &calldata->arg.seq_args,
5647                                 &calldata->res.seq_res,
5648                                 task) != 0)
5649                 nfs_release_seqid(calldata->arg.seqid);
5650         return;
5651 out_no_action:
5652         task->tk_action = NULL;
5653 out_wait:
5654         nfs4_sequence_done(task, &calldata->res.seq_res);
5655 }
5656
5657 static const struct rpc_call_ops nfs4_locku_ops = {
5658         .rpc_call_prepare = nfs4_locku_prepare,
5659         .rpc_call_done = nfs4_locku_done,
5660         .rpc_release = nfs4_locku_release_calldata,
5661 };
5662
5663 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
5664                 struct nfs_open_context *ctx,
5665                 struct nfs4_lock_state *lsp,
5666                 struct nfs_seqid *seqid)
5667 {
5668         struct nfs4_unlockdata *data;
5669         struct rpc_message msg = {
5670                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
5671                 .rpc_cred = ctx->cred,
5672         };
5673         struct rpc_task_setup task_setup_data = {
5674                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
5675                 .rpc_message = &msg,
5676                 .callback_ops = &nfs4_locku_ops,
5677                 .workqueue = nfsiod_workqueue,
5678                 .flags = RPC_TASK_ASYNC,
5679         };
5680
5681         nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
5682                 NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
5683
5684         /* Ensure this is an unlock - when canceling a lock, the
5685          * canceled lock is passed in, and it won't be an unlock.
5686          */
5687         fl->fl_type = F_UNLCK;
5688
5689         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
5690         if (data == NULL) {
5691                 nfs_free_seqid(seqid);
5692                 return ERR_PTR(-ENOMEM);
5693         }
5694
5695         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5696         msg.rpc_argp = &data->arg;
5697         msg.rpc_resp = &data->res;
5698         task_setup_data.callback_data = data;
5699         return rpc_run_task(&task_setup_data);
5700 }
5701
5702 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
5703 {
5704         struct inode *inode = state->inode;
5705         struct nfs4_state_owner *sp = state->owner;
5706         struct nfs_inode *nfsi = NFS_I(inode);
5707         struct nfs_seqid *seqid;
5708         struct nfs4_lock_state *lsp;
5709         struct rpc_task *task;
5710         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5711         int status = 0;
5712         unsigned char fl_flags = request->fl_flags;
5713
5714         status = nfs4_set_lock_state(state, request);
5715         /* Unlock _before_ we do the RPC call */
5716         request->fl_flags |= FL_EXISTS;
5717         /* Exclude nfs_delegation_claim_locks() */
5718         mutex_lock(&sp->so_delegreturn_mutex);
5719         /* Exclude nfs4_reclaim_open_stateid() - note nesting! */
5720         down_read(&nfsi->rwsem);
5721         if (do_vfs_lock(inode, request) == -ENOENT) {
5722                 up_read(&nfsi->rwsem);
5723                 mutex_unlock(&sp->so_delegreturn_mutex);
5724                 goto out;
5725         }
5726         up_read(&nfsi->rwsem);
5727         mutex_unlock(&sp->so_delegreturn_mutex);
5728         if (status != 0)
5729                 goto out;
5730         /* Is this a delegated lock? */
5731         lsp = request->fl_u.nfs4_fl.owner;
5732         if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
5733                 goto out;
5734         alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
5735         seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
5736         status = -ENOMEM;
5737         if (IS_ERR(seqid))
5738                 goto out;
5739         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
5740         status = PTR_ERR(task);
5741         if (IS_ERR(task))
5742                 goto out;
5743         status = nfs4_wait_for_completion_rpc_task(task);
5744         rpc_put_task(task);
5745 out:
5746         request->fl_flags = fl_flags;
5747         trace_nfs4_unlock(request, state, F_SETLK, status);
5748         return status;
5749 }
5750
5751 struct nfs4_lockdata {
5752         struct nfs_lock_args arg;
5753         struct nfs_lock_res res;
5754         struct nfs4_lock_state *lsp;
5755         struct nfs_open_context *ctx;
5756         struct file_lock fl;
5757         unsigned long timestamp;
5758         int rpc_status;
5759         int cancelled;
5760         struct nfs_server *server;
5761 };
5762
5763 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
5764                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
5765                 gfp_t gfp_mask)
5766 {
5767         struct nfs4_lockdata *p;
5768         struct inode *inode = lsp->ls_state->inode;
5769         struct nfs_server *server = NFS_SERVER(inode);
5770         struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
5771
5772         p = kzalloc(sizeof(*p), gfp_mask);
5773         if (p == NULL)
5774                 return NULL;
5775
5776         p->arg.fh = NFS_FH(inode);
5777         p->arg.fl = &p->fl;
5778         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
5779         if (IS_ERR(p->arg.open_seqid))
5780                 goto out_free;
5781         alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
5782         p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
5783         if (IS_ERR(p->arg.lock_seqid))
5784                 goto out_free_seqid;
5785         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
5786         p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
5787         p->arg.lock_owner.s_dev = server->s_dev;
5788         p->res.lock_seqid = p->arg.lock_seqid;
5789         p->lsp = lsp;
5790         p->server = server;
5791         atomic_inc(&lsp->ls_count);
5792         p->ctx = get_nfs_open_context(ctx);
5793         get_file(fl->fl_file);
5794         memcpy(&p->fl, fl, sizeof(p->fl));
5795         return p;
5796 out_free_seqid:
5797         nfs_free_seqid(p->arg.open_seqid);
5798 out_free:
5799         kfree(p);
5800         return NULL;
5801 }
5802
5803 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
5804 {
5805         struct nfs4_lockdata *data = calldata;
5806         struct nfs4_state *state = data->lsp->ls_state;
5807
5808         dprintk("%s: begin!\n", __func__);
5809         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
5810                 goto out_wait;
5811         /* Do we need to do an open_to_lock_owner? */
5812         if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
5813                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
5814                         goto out_release_lock_seqid;
5815                 }
5816                 nfs4_stateid_copy(&data->arg.open_stateid,
5817                                 &state->open_stateid);
5818                 data->arg.new_lock_owner = 1;
5819                 data->res.open_seqid = data->arg.open_seqid;
5820         } else {
5821                 data->arg.new_lock_owner = 0;
5822                 nfs4_stateid_copy(&data->arg.lock_stateid,
5823                                 &data->lsp->ls_stateid);
5824         }
5825         if (!nfs4_valid_open_stateid(state)) {
5826                 data->rpc_status = -EBADF;
5827                 task->tk_action = NULL;
5828                 goto out_release_open_seqid;
5829         }
5830         data->timestamp = jiffies;
5831         if (nfs4_setup_sequence(data->server,
5832                                 &data->arg.seq_args,
5833                                 &data->res.seq_res,
5834                                 task) == 0)
5835                 return;
5836 out_release_open_seqid:
5837         nfs_release_seqid(data->arg.open_seqid);
5838 out_release_lock_seqid:
5839         nfs_release_seqid(data->arg.lock_seqid);
5840 out_wait:
5841         nfs4_sequence_done(task, &data->res.seq_res);
5842         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
5843 }
5844
5845 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
5846 {
5847         struct nfs4_lockdata *data = calldata;
5848         struct nfs4_lock_state *lsp = data->lsp;
5849
5850         dprintk("%s: begin!\n", __func__);
5851
5852         if (!nfs4_sequence_done(task, &data->res.seq_res))
5853                 return;
5854
5855         data->rpc_status = task->tk_status;
5856         switch (task->tk_status) {
5857         case 0:
5858                 renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
5859                                 data->timestamp);
5860                 if (data->arg.new_lock) {
5861                         data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
5862                         if (do_vfs_lock(lsp->ls_state->inode, &data->fl) < 0) {
5863                                 rpc_restart_call_prepare(task);
5864                                 break;
5865                         }
5866                 }
5867                 if (data->arg.new_lock_owner != 0) {
5868                         nfs_confirm_seqid(&lsp->ls_seqid, 0);
5869                         nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
5870                         set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
5871                 } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
5872                         rpc_restart_call_prepare(task);
5873                 break;
5874         case -NFS4ERR_BAD_STATEID:
5875         case -NFS4ERR_OLD_STATEID:
5876         case -NFS4ERR_STALE_STATEID:
5877         case -NFS4ERR_EXPIRED:
5878                 if (data->arg.new_lock_owner != 0) {
5879                         if (!nfs4_stateid_match(&data->arg.open_stateid,
5880                                                 &lsp->ls_state->open_stateid))
5881                                 rpc_restart_call_prepare(task);
5882                 } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
5883                                                 &lsp->ls_stateid))
5884                                 rpc_restart_call_prepare(task);
5885         }
5886         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
5887 }
5888
5889 static void nfs4_lock_release(void *calldata)
5890 {
5891         struct nfs4_lockdata *data = calldata;
5892
5893         dprintk("%s: begin!\n", __func__);
5894         nfs_free_seqid(data->arg.open_seqid);
5895         if (data->cancelled != 0) {
5896                 struct rpc_task *task;
5897                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
5898                                 data->arg.lock_seqid);
5899                 if (!IS_ERR(task))
5900                         rpc_put_task_async(task);
5901                 dprintk("%s: cancelling lock!\n", __func__);
5902         } else
5903                 nfs_free_seqid(data->arg.lock_seqid);
5904         nfs4_put_lock_state(data->lsp);
5905         put_nfs_open_context(data->ctx);
5906         fput(data->fl.fl_file);
5907         kfree(data);
5908         dprintk("%s: done!\n", __func__);
5909 }
5910
5911 static const struct rpc_call_ops nfs4_lock_ops = {
5912         .rpc_call_prepare = nfs4_lock_prepare,
5913         .rpc_call_done = nfs4_lock_done,
5914         .rpc_release = nfs4_lock_release,
5915 };
5916
5917 static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
5918 {
5919         switch (error) {
5920         case -NFS4ERR_ADMIN_REVOKED:
5921         case -NFS4ERR_BAD_STATEID:
5922                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5923                 if (new_lock_owner != 0 ||
5924                    test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
5925                         nfs4_schedule_stateid_recovery(server, lsp->ls_state);
5926                 break;
5927         case -NFS4ERR_STALE_STATEID:
5928                 lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
5929         case -NFS4ERR_EXPIRED:
5930                 nfs4_schedule_lease_recovery(server->nfs_client);
5931         };
5932 }
5933
5934 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
5935 {
5936         struct nfs4_lockdata *data;
5937         struct rpc_task *task;
5938         struct rpc_message msg = {
5939                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
5940                 .rpc_cred = state->owner->so_cred,
5941         };
5942         struct rpc_task_setup task_setup_data = {
5943                 .rpc_client = NFS_CLIENT(state->inode),
5944                 .rpc_message = &msg,
5945                 .callback_ops = &nfs4_lock_ops,
5946                 .workqueue = nfsiod_workqueue,
5947                 .flags = RPC_TASK_ASYNC,
5948         };
5949         int ret;
5950
5951         dprintk("%s: begin!\n", __func__);
5952         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
5953                         fl->fl_u.nfs4_fl.owner,
5954                         recovery_type == NFS_LOCK_NEW ? GFP_KERNEL : GFP_NOFS);
5955         if (data == NULL)
5956                 return -ENOMEM;
5957         if (IS_SETLKW(cmd))
5958                 data->arg.block = 1;
5959         nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1);
5960         msg.rpc_argp = &data->arg;
5961         msg.rpc_resp = &data->res;
5962         task_setup_data.callback_data = data;
5963         if (recovery_type > NFS_LOCK_NEW) {
5964                 if (recovery_type == NFS_LOCK_RECLAIM)
5965                         data->arg.reclaim = NFS_LOCK_RECLAIM;
5966                 nfs4_set_sequence_privileged(&data->arg.seq_args);
5967         } else
5968                 data->arg.new_lock = 1;
5969         task = rpc_run_task(&task_setup_data);
5970         if (IS_ERR(task))
5971                 return PTR_ERR(task);
5972         ret = nfs4_wait_for_completion_rpc_task(task);
5973         if (ret == 0) {
5974                 ret = data->rpc_status;
5975                 if (ret)
5976                         nfs4_handle_setlk_error(data->server, data->lsp,
5977                                         data->arg.new_lock_owner, ret);
5978         } else
5979                 data->cancelled = 1;
5980         rpc_put_task(task);
5981         dprintk("%s: done, ret = %d!\n", __func__, ret);
5982         trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
5983         return ret;
5984 }
5985
5986 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
5987 {
5988         struct nfs_server *server = NFS_SERVER(state->inode);
5989         struct nfs4_exception exception = {
5990                 .inode = state->inode,
5991         };
5992         int err;
5993
5994         do {
5995                 /* Cache the lock if possible... */
5996                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
5997                         return 0;
5998                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
5999                 if (err != -NFS4ERR_DELAY)
6000                         break;
6001                 nfs4_handle_exception(server, err, &exception);
6002         } while (exception.retry);
6003         return err;
6004 }
6005
6006 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
6007 {
6008         struct nfs_server *server = NFS_SERVER(state->inode);
6009         struct nfs4_exception exception = {
6010                 .inode = state->inode,
6011         };
6012         int err;
6013
6014         err = nfs4_set_lock_state(state, request);
6015         if (err != 0)
6016                 return err;
6017         if (!recover_lost_locks) {
6018                 set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
6019                 return 0;
6020         }
6021         do {
6022                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
6023                         return 0;
6024                 err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
6025                 switch (err) {
6026                 default:
6027                         goto out;
6028                 case -NFS4ERR_GRACE:
6029                 case -NFS4ERR_DELAY:
6030                         nfs4_handle_exception(server, err, &exception);
6031                         err = 0;
6032                 }
6033         } while (exception.retry);
6034 out:
6035         return err;
6036 }
6037
6038 #if defined(CONFIG_NFS_V4_1)
6039 /**
6040  * nfs41_check_expired_locks - possibly free a lock stateid
6041  *
6042  * @state: NFSv4 state for an inode
6043  *
6044  * Returns NFS_OK if recovery for this stateid is now finished.
6045  * Otherwise a negative NFS4ERR value is returned.
6046  */
6047 static int nfs41_check_expired_locks(struct nfs4_state *state)
6048 {
6049         int status, ret = -NFS4ERR_BAD_STATEID;
6050         struct nfs4_lock_state *lsp;
6051         struct nfs_server *server = NFS_SERVER(state->inode);
6052
6053         list_for_each_entry(lsp, &state->lock_states, ls_locks) {
6054                 if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
6055                         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
6056
6057                         status = nfs41_test_stateid(server,
6058                                         &lsp->ls_stateid,
6059                                         cred);
6060                         trace_nfs4_test_lock_stateid(state, lsp, status);
6061                         if (status != NFS_OK) {
6062                                 /* Free the stateid unless the server
6063                                  * informs us the stateid is unrecognized. */
6064                                 if (status != -NFS4ERR_BAD_STATEID)
6065                                         nfs41_free_stateid(server,
6066                                                         &lsp->ls_stateid,
6067                                                         cred);
6068                                 clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
6069                                 ret = status;
6070                         }
6071                 }
6072         };
6073
6074         return ret;
6075 }
6076
6077 static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
6078 {
6079         int status = NFS_OK;
6080
6081         if (test_bit(LK_STATE_IN_USE, &state->flags))
6082                 status = nfs41_check_expired_locks(state);
6083         if (status != NFS_OK)
6084                 status = nfs4_lock_expired(state, request);
6085         return status;
6086 }
6087 #endif
6088
6089 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6090 {
6091         struct nfs_inode *nfsi = NFS_I(state->inode);
6092         struct nfs4_state_owner *sp = state->owner;
6093         unsigned char fl_flags = request->fl_flags;
6094         int status = -ENOLCK;
6095
6096         if ((fl_flags & FL_POSIX) &&
6097                         !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
6098                 goto out;
6099         /* Is this a delegated open? */
6100         status = nfs4_set_lock_state(state, request);
6101         if (status != 0)
6102                 goto out;
6103         request->fl_flags |= FL_ACCESS;
6104         status = do_vfs_lock(state->inode, request);
6105         if (status < 0)
6106                 goto out;
6107         mutex_lock(&sp->so_delegreturn_mutex);
6108         down_read(&nfsi->rwsem);
6109         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
6110                 /* Yes: cache locks! */
6111                 /* ...but avoid races with delegation recall... */
6112                 request->fl_flags = fl_flags & ~FL_SLEEP;
6113                 status = do_vfs_lock(state->inode, request);
6114                 up_read(&nfsi->rwsem);
6115                 mutex_unlock(&sp->so_delegreturn_mutex);
6116                 goto out;
6117         }
6118         up_read(&nfsi->rwsem);
6119         mutex_unlock(&sp->so_delegreturn_mutex);
6120         status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
6121 out:
6122         request->fl_flags = fl_flags;
6123         return status;
6124 }
6125
6126 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
6127 {
6128         struct nfs4_exception exception = {
6129                 .state = state,
6130                 .inode = state->inode,
6131         };
6132         int err;
6133
6134         do {
6135                 err = _nfs4_proc_setlk(state, cmd, request);
6136                 if (err == -NFS4ERR_DENIED)
6137                         err = -EAGAIN;
6138                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
6139                                 err, &exception);
6140         } while (exception.retry);
6141         return err;
6142 }
6143
6144 static int
6145 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
6146 {
6147         struct nfs_open_context *ctx;
6148         struct nfs4_state *state;
6149         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
6150         int status;
6151
6152         /* verify open state */
6153         ctx = nfs_file_open_context(filp);
6154         state = ctx->state;
6155
6156         if (request->fl_start < 0 || request->fl_end < 0)
6157                 return -EINVAL;
6158
6159         if (IS_GETLK(cmd)) {
6160                 if (state != NULL)
6161                         return nfs4_proc_getlk(state, F_GETLK, request);
6162                 return 0;
6163         }
6164
6165         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
6166                 return -EINVAL;
6167
6168         if (request->fl_type == F_UNLCK) {
6169                 if (state != NULL)
6170                         return nfs4_proc_unlck(state, cmd, request);
6171                 return 0;
6172         }
6173
6174         if (state == NULL)
6175                 return -ENOLCK;
6176         /*
6177          * Don't rely on the VFS having checked the file open mode,
6178          * since it won't do this for flock() locks.
6179          */
6180         switch (request->fl_type) {
6181         case F_RDLCK:
6182                 if (!(filp->f_mode & FMODE_READ))
6183                         return -EBADF;
6184                 break;
6185         case F_WRLCK:
6186                 if (!(filp->f_mode & FMODE_WRITE))
6187                         return -EBADF;
6188         }
6189
6190         do {
6191                 status = nfs4_proc_setlk(state, cmd, request);
6192                 if ((status != -EAGAIN) || IS_SETLK(cmd))
6193                         break;
6194                 timeout = nfs4_set_lock_task_retry(timeout);
6195                 status = -ERESTARTSYS;
6196                 if (signalled())
6197                         break;
6198         } while(status < 0);
6199         return status;
6200 }
6201
6202 int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
6203 {
6204         struct nfs_server *server = NFS_SERVER(state->inode);
6205         int err;
6206
6207         err = nfs4_set_lock_state(state, fl);
6208         if (err != 0)
6209                 return err;
6210         err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
6211         return nfs4_handle_delegation_recall_error(server, state, stateid, err);
6212 }
6213
6214 struct nfs_release_lockowner_data {
6215         struct nfs4_lock_state *lsp;
6216         struct nfs_server *server;
6217         struct nfs_release_lockowner_args args;
6218         struct nfs_release_lockowner_res res;
6219         unsigned long timestamp;
6220 };
6221
6222 static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
6223 {
6224         struct nfs_release_lockowner_data *data = calldata;
6225         struct nfs_server *server = data->server;
6226         nfs40_setup_sequence(server->nfs_client->cl_slot_tbl,
6227                              &data->args.seq_args, &data->res.seq_res, task);
6228         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6229         data->timestamp = jiffies;
6230 }
6231
6232 static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
6233 {
6234         struct nfs_release_lockowner_data *data = calldata;
6235         struct nfs_server *server = data->server;
6236
6237         nfs40_sequence_done(task, &data->res.seq_res);
6238
6239         switch (task->tk_status) {
6240         case 0:
6241                 renew_lease(server, data->timestamp);
6242                 break;
6243         case -NFS4ERR_STALE_CLIENTID:
6244         case -NFS4ERR_EXPIRED:
6245                 nfs4_schedule_lease_recovery(server->nfs_client);
6246                 break;
6247         case -NFS4ERR_LEASE_MOVED:
6248         case -NFS4ERR_DELAY:
6249                 if (nfs4_async_handle_error(task, server,
6250                                             NULL, NULL) == -EAGAIN)
6251                         rpc_restart_call_prepare(task);
6252         }
6253 }
6254
6255 static void nfs4_release_lockowner_release(void *calldata)
6256 {
6257         struct nfs_release_lockowner_data *data = calldata;
6258         nfs4_free_lock_state(data->server, data->lsp);
6259         kfree(calldata);
6260 }
6261
6262 static const struct rpc_call_ops nfs4_release_lockowner_ops = {
6263         .rpc_call_prepare = nfs4_release_lockowner_prepare,
6264         .rpc_call_done = nfs4_release_lockowner_done,
6265         .rpc_release = nfs4_release_lockowner_release,
6266 };
6267
6268 static void
6269 nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
6270 {
6271         struct nfs_release_lockowner_data *data;
6272         struct rpc_message msg = {
6273                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
6274         };
6275
6276         if (server->nfs_client->cl_mvops->minor_version != 0)
6277                 return;
6278
6279         data = kmalloc(sizeof(*data), GFP_NOFS);
6280         if (!data)
6281                 return;
6282         data->lsp = lsp;
6283         data->server = server;
6284         data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
6285         data->args.lock_owner.id = lsp->ls_seqid.owner_id;
6286         data->args.lock_owner.s_dev = server->s_dev;
6287
6288         msg.rpc_argp = &data->args;
6289         msg.rpc_resp = &data->res;
6290         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
6291         rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
6292 }
6293
6294 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
6295
6296 static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
6297                                    struct dentry *unused, struct inode *inode,
6298                                    const char *key, const void *buf,
6299                                    size_t buflen, int flags)
6300 {
6301         return nfs4_proc_set_acl(inode, buf, buflen);
6302 }
6303
6304 static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
6305                                    struct dentry *unused, struct inode *inode,
6306                                    const char *key, void *buf, size_t buflen)
6307 {
6308         return nfs4_proc_get_acl(inode, buf, buflen);
6309 }
6310
6311 static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
6312 {
6313         return nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry)));
6314 }
6315
6316 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
6317
6318 static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
6319                                      struct dentry *unused, struct inode *inode,
6320                                      const char *key, const void *buf,
6321                                      size_t buflen, int flags)
6322 {
6323         if (security_ismaclabel(key))
6324                 return nfs4_set_security_label(inode, buf, buflen);
6325
6326         return -EOPNOTSUPP;
6327 }
6328
6329 static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
6330                                      struct dentry *unused, struct inode *inode,
6331                                      const char *key, void *buf, size_t buflen)
6332 {
6333         if (security_ismaclabel(key))
6334                 return nfs4_get_security_label(inode, buf, buflen);
6335         return -EOPNOTSUPP;
6336 }
6337
6338 static ssize_t
6339 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6340 {
6341         int len = 0;
6342
6343         if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
6344                 len = security_inode_listsecurity(inode, list, list_len);
6345                 if (list_len && len > list_len)
6346                         return -ERANGE;
6347         }
6348         return len;
6349 }
6350
6351 static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
6352         .prefix = XATTR_SECURITY_PREFIX,
6353         .get    = nfs4_xattr_get_nfs4_label,
6354         .set    = nfs4_xattr_set_nfs4_label,
6355 };
6356
6357 #else
6358
6359 static ssize_t
6360 nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
6361 {
6362         return 0;
6363 }
6364
6365 #endif
6366
6367 /*
6368  * nfs_fhget will use either the mounted_on_fileid or the fileid
6369  */
6370 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
6371 {
6372         if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
6373                (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
6374               (fattr->valid & NFS_ATTR_FATTR_FSID) &&
6375               (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
6376                 return;
6377
6378         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
6379                 NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
6380         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
6381         fattr->nlink = 2;
6382 }
6383
6384 static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6385                                    const struct qstr *name,
6386                                    struct nfs4_fs_locations *fs_locations,
6387                                    struct page *page)
6388 {
6389         struct nfs_server *server = NFS_SERVER(dir);
6390         u32 bitmask[3] = {
6391                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6392         };
6393         struct nfs4_fs_locations_arg args = {
6394                 .dir_fh = NFS_FH(dir),
6395                 .name = name,
6396                 .page = page,
6397                 .bitmask = bitmask,
6398         };
6399         struct nfs4_fs_locations_res res = {
6400                 .fs_locations = fs_locations,
6401         };
6402         struct rpc_message msg = {
6403                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6404                 .rpc_argp = &args,
6405                 .rpc_resp = &res,
6406         };
6407         int status;
6408
6409         dprintk("%s: start\n", __func__);
6410
6411         /* Ask for the fileid of the absent filesystem if mounted_on_fileid
6412          * is not supported */
6413         if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
6414                 bitmask[1] |= FATTR4_WORD1_MOUNTED_ON_FILEID;
6415         else
6416                 bitmask[0] |= FATTR4_WORD0_FILEID;
6417
6418         nfs_fattr_init(&fs_locations->fattr);
6419         fs_locations->server = server;
6420         fs_locations->nlocations = 0;
6421         status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
6422         dprintk("%s: returned status = %d\n", __func__, status);
6423         return status;
6424 }
6425
6426 int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
6427                            const struct qstr *name,
6428                            struct nfs4_fs_locations *fs_locations,
6429                            struct page *page)
6430 {
6431         struct nfs4_exception exception = { };
6432         int err;
6433         do {
6434                 err = _nfs4_proc_fs_locations(client, dir, name,
6435                                 fs_locations, page);
6436                 trace_nfs4_get_fs_locations(dir, name, err);
6437                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6438                                 &exception);
6439         } while (exception.retry);
6440         return err;
6441 }
6442
6443 /*
6444  * This operation also signals the server that this client is
6445  * performing migration recovery.  The server can stop returning
6446  * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
6447  * appended to this compound to identify the client ID which is
6448  * performing recovery.
6449  */
6450 static int _nfs40_proc_get_locations(struct inode *inode,
6451                                      struct nfs4_fs_locations *locations,
6452                                      struct page *page, struct rpc_cred *cred)
6453 {
6454         struct nfs_server *server = NFS_SERVER(inode);
6455         struct rpc_clnt *clnt = server->client;
6456         u32 bitmask[2] = {
6457                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6458         };
6459         struct nfs4_fs_locations_arg args = {
6460                 .clientid       = server->nfs_client->cl_clientid,
6461                 .fh             = NFS_FH(inode),
6462                 .page           = page,
6463                 .bitmask        = bitmask,
6464                 .migration      = 1,            /* skip LOOKUP */
6465                 .renew          = 1,            /* append RENEW */
6466         };
6467         struct nfs4_fs_locations_res res = {
6468                 .fs_locations   = locations,
6469                 .migration      = 1,
6470                 .renew          = 1,
6471         };
6472         struct rpc_message msg = {
6473                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6474                 .rpc_argp       = &args,
6475                 .rpc_resp       = &res,
6476                 .rpc_cred       = cred,
6477         };
6478         unsigned long now = jiffies;
6479         int status;
6480
6481         nfs_fattr_init(&locations->fattr);
6482         locations->server = server;
6483         locations->nlocations = 0;
6484
6485         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6486         nfs4_set_sequence_privileged(&args.seq_args);
6487         status = nfs4_call_sync_sequence(clnt, server, &msg,
6488                                         &args.seq_args, &res.seq_res);
6489         if (status)
6490                 return status;
6491
6492         renew_lease(server, now);
6493         return 0;
6494 }
6495
6496 #ifdef CONFIG_NFS_V4_1
6497
6498 /*
6499  * This operation also signals the server that this client is
6500  * performing migration recovery.  The server can stop asserting
6501  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
6502  * performing this operation is identified in the SEQUENCE
6503  * operation in this compound.
6504  *
6505  * When the client supports GETATTR(fs_locations_info), it can
6506  * be plumbed in here.
6507  */
6508 static int _nfs41_proc_get_locations(struct inode *inode,
6509                                      struct nfs4_fs_locations *locations,
6510                                      struct page *page, struct rpc_cred *cred)
6511 {
6512         struct nfs_server *server = NFS_SERVER(inode);
6513         struct rpc_clnt *clnt = server->client;
6514         u32 bitmask[2] = {
6515                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
6516         };
6517         struct nfs4_fs_locations_arg args = {
6518                 .fh             = NFS_FH(inode),
6519                 .page           = page,
6520                 .bitmask        = bitmask,
6521                 .migration      = 1,            /* skip LOOKUP */
6522         };
6523         struct nfs4_fs_locations_res res = {
6524                 .fs_locations   = locations,
6525                 .migration      = 1,
6526         };
6527         struct rpc_message msg = {
6528                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
6529                 .rpc_argp       = &args,
6530                 .rpc_resp       = &res,
6531                 .rpc_cred       = cred,
6532         };
6533         int status;
6534
6535         nfs_fattr_init(&locations->fattr);
6536         locations->server = server;
6537         locations->nlocations = 0;
6538
6539         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6540         nfs4_set_sequence_privileged(&args.seq_args);
6541         status = nfs4_call_sync_sequence(clnt, server, &msg,
6542                                         &args.seq_args, &res.seq_res);
6543         if (status == NFS4_OK &&
6544             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6545                 status = -NFS4ERR_LEASE_MOVED;
6546         return status;
6547 }
6548
6549 #endif  /* CONFIG_NFS_V4_1 */
6550
6551 /**
6552  * nfs4_proc_get_locations - discover locations for a migrated FSID
6553  * @inode: inode on FSID that is migrating
6554  * @locations: result of query
6555  * @page: buffer
6556  * @cred: credential to use for this operation
6557  *
6558  * Returns NFS4_OK on success, a negative NFS4ERR status code if the
6559  * operation failed, or a negative errno if a local error occurred.
6560  *
6561  * On success, "locations" is filled in, but if the server has
6562  * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
6563  * asserted.
6564  *
6565  * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
6566  * from this client that require migration recovery.
6567  */
6568 int nfs4_proc_get_locations(struct inode *inode,
6569                             struct nfs4_fs_locations *locations,
6570                             struct page *page, struct rpc_cred *cred)
6571 {
6572         struct nfs_server *server = NFS_SERVER(inode);
6573         struct nfs_client *clp = server->nfs_client;
6574         const struct nfs4_mig_recovery_ops *ops =
6575                                         clp->cl_mvops->mig_recovery_ops;
6576         struct nfs4_exception exception = { };
6577         int status;
6578
6579         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6580                 (unsigned long long)server->fsid.major,
6581                 (unsigned long long)server->fsid.minor,
6582                 clp->cl_hostname);
6583         nfs_display_fhandle(NFS_FH(inode), __func__);
6584
6585         do {
6586                 status = ops->get_locations(inode, locations, page, cred);
6587                 if (status != -NFS4ERR_DELAY)
6588                         break;
6589                 nfs4_handle_exception(server, status, &exception);
6590         } while (exception.retry);
6591         return status;
6592 }
6593
6594 /*
6595  * This operation also signals the server that this client is
6596  * performing "lease moved" recovery.  The server can stop
6597  * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
6598  * is appended to this compound to identify the client ID which is
6599  * performing recovery.
6600  */
6601 static int _nfs40_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6602 {
6603         struct nfs_server *server = NFS_SERVER(inode);
6604         struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
6605         struct rpc_clnt *clnt = server->client;
6606         struct nfs4_fsid_present_arg args = {
6607                 .fh             = NFS_FH(inode),
6608                 .clientid       = clp->cl_clientid,
6609                 .renew          = 1,            /* append RENEW */
6610         };
6611         struct nfs4_fsid_present_res res = {
6612                 .renew          = 1,
6613         };
6614         struct rpc_message msg = {
6615                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6616                 .rpc_argp       = &args,
6617                 .rpc_resp       = &res,
6618                 .rpc_cred       = cred,
6619         };
6620         unsigned long now = jiffies;
6621         int status;
6622
6623         res.fh = nfs_alloc_fhandle();
6624         if (res.fh == NULL)
6625                 return -ENOMEM;
6626
6627         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
6628         nfs4_set_sequence_privileged(&args.seq_args);
6629         status = nfs4_call_sync_sequence(clnt, server, &msg,
6630                                                 &args.seq_args, &res.seq_res);
6631         nfs_free_fhandle(res.fh);
6632         if (status)
6633                 return status;
6634
6635         do_renew_lease(clp, now);
6636         return 0;
6637 }
6638
6639 #ifdef CONFIG_NFS_V4_1
6640
6641 /*
6642  * This operation also signals the server that this client is
6643  * performing "lease moved" recovery.  The server can stop asserting
6644  * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
6645  * this operation is identified in the SEQUENCE operation in this
6646  * compound.
6647  */
6648 static int _nfs41_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6649 {
6650         struct nfs_server *server = NFS_SERVER(inode);
6651         struct rpc_clnt *clnt = server->client;
6652         struct nfs4_fsid_present_arg args = {
6653                 .fh             = NFS_FH(inode),
6654         };
6655         struct nfs4_fsid_present_res res = {
6656         };
6657         struct rpc_message msg = {
6658                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
6659                 .rpc_argp       = &args,
6660                 .rpc_resp       = &res,
6661                 .rpc_cred       = cred,
6662         };
6663         int status;
6664
6665         res.fh = nfs_alloc_fhandle();
6666         if (res.fh == NULL)
6667                 return -ENOMEM;
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         nfs_free_fhandle(res.fh);
6674         if (status == NFS4_OK &&
6675             res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
6676                 status = -NFS4ERR_LEASE_MOVED;
6677         return status;
6678 }
6679
6680 #endif  /* CONFIG_NFS_V4_1 */
6681
6682 /**
6683  * nfs4_proc_fsid_present - Is this FSID present or absent on server?
6684  * @inode: inode on FSID to check
6685  * @cred: credential to use for this operation
6686  *
6687  * Server indicates whether the FSID is present, moved, or not
6688  * recognized.  This operation is necessary to clear a LEASE_MOVED
6689  * condition for this client ID.
6690  *
6691  * Returns NFS4_OK if the FSID is present on this server,
6692  * -NFS4ERR_MOVED if the FSID is no longer present, a negative
6693  *  NFS4ERR code if some error occurred on the server, or a
6694  *  negative errno if a local failure occurred.
6695  */
6696 int nfs4_proc_fsid_present(struct inode *inode, struct rpc_cred *cred)
6697 {
6698         struct nfs_server *server = NFS_SERVER(inode);
6699         struct nfs_client *clp = server->nfs_client;
6700         const struct nfs4_mig_recovery_ops *ops =
6701                                         clp->cl_mvops->mig_recovery_ops;
6702         struct nfs4_exception exception = { };
6703         int status;
6704
6705         dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
6706                 (unsigned long long)server->fsid.major,
6707                 (unsigned long long)server->fsid.minor,
6708                 clp->cl_hostname);
6709         nfs_display_fhandle(NFS_FH(inode), __func__);
6710
6711         do {
6712                 status = ops->fsid_present(inode, cred);
6713                 if (status != -NFS4ERR_DELAY)
6714                         break;
6715                 nfs4_handle_exception(server, status, &exception);
6716         } while (exception.retry);
6717         return status;
6718 }
6719
6720 /**
6721  * If 'use_integrity' is true and the state managment nfs_client
6722  * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
6723  * and the machine credential as per RFC3530bis and RFC5661 Security
6724  * Considerations sections. Otherwise, just use the user cred with the
6725  * filesystem's rpc_client.
6726  */
6727 static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
6728 {
6729         int status;
6730         struct nfs4_secinfo_arg args = {
6731                 .dir_fh = NFS_FH(dir),
6732                 .name   = name,
6733         };
6734         struct nfs4_secinfo_res res = {
6735                 .flavors     = flavors,
6736         };
6737         struct rpc_message msg = {
6738                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
6739                 .rpc_argp = &args,
6740                 .rpc_resp = &res,
6741         };
6742         struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
6743         struct rpc_cred *cred = NULL;
6744
6745         if (use_integrity) {
6746                 clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
6747                 cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
6748                 msg.rpc_cred = cred;
6749         }
6750
6751         dprintk("NFS call  secinfo %s\n", name->name);
6752
6753         nfs4_state_protect(NFS_SERVER(dir)->nfs_client,
6754                 NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
6755
6756         status = nfs4_call_sync(clnt, NFS_SERVER(dir), &msg, &args.seq_args,
6757                                 &res.seq_res, 0);
6758         dprintk("NFS reply  secinfo: %d\n", status);
6759
6760         if (cred)
6761                 put_rpccred(cred);
6762
6763         return status;
6764 }
6765
6766 int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
6767                       struct nfs4_secinfo_flavors *flavors)
6768 {
6769         struct nfs4_exception exception = { };
6770         int err;
6771         do {
6772                 err = -NFS4ERR_WRONGSEC;
6773
6774                 /* try to use integrity protection with machine cred */
6775                 if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
6776                         err = _nfs4_proc_secinfo(dir, name, flavors, true);
6777
6778                 /*
6779                  * if unable to use integrity protection, or SECINFO with
6780                  * integrity protection returns NFS4ERR_WRONGSEC (which is
6781                  * disallowed by spec, but exists in deployed servers) use
6782                  * the current filesystem's rpc_client and the user cred.
6783                  */
6784                 if (err == -NFS4ERR_WRONGSEC)
6785                         err = _nfs4_proc_secinfo(dir, name, flavors, false);
6786
6787                 trace_nfs4_secinfo(dir, name, err);
6788                 err = nfs4_handle_exception(NFS_SERVER(dir), err,
6789                                 &exception);
6790         } while (exception.retry);
6791         return err;
6792 }
6793
6794 #ifdef CONFIG_NFS_V4_1
6795 /*
6796  * Check the exchange flags returned by the server for invalid flags, having
6797  * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
6798  * DS flags set.
6799  */
6800 static int nfs4_check_cl_exchange_flags(u32 flags)
6801 {
6802         if (flags & ~EXCHGID4_FLAG_MASK_R)
6803                 goto out_inval;
6804         if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
6805             (flags & EXCHGID4_FLAG_USE_NON_PNFS))
6806                 goto out_inval;
6807         if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
6808                 goto out_inval;
6809         return NFS_OK;
6810 out_inval:
6811         return -NFS4ERR_INVAL;
6812 }
6813
6814 static bool
6815 nfs41_same_server_scope(struct nfs41_server_scope *a,
6816                         struct nfs41_server_scope *b)
6817 {
6818         if (a->server_scope_sz == b->server_scope_sz &&
6819             memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0)
6820                 return true;
6821
6822         return false;
6823 }
6824
6825 static void
6826 nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
6827 {
6828 }
6829
6830 static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
6831         .rpc_call_done =  &nfs4_bind_one_conn_to_session_done,
6832 };
6833
6834 /*
6835  * nfs4_proc_bind_one_conn_to_session()
6836  *
6837  * The 4.1 client currently uses the same TCP connection for the
6838  * fore and backchannel.
6839  */
6840 static
6841 int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
6842                 struct rpc_xprt *xprt,
6843                 struct nfs_client *clp,
6844                 struct rpc_cred *cred)
6845 {
6846         int status;
6847         struct nfs41_bind_conn_to_session_args args = {
6848                 .client = clp,
6849                 .dir = NFS4_CDFC4_FORE_OR_BOTH,
6850         };
6851         struct nfs41_bind_conn_to_session_res res;
6852         struct rpc_message msg = {
6853                 .rpc_proc =
6854                         &nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
6855                 .rpc_argp = &args,
6856                 .rpc_resp = &res,
6857                 .rpc_cred = cred,
6858         };
6859         struct rpc_task_setup task_setup_data = {
6860                 .rpc_client = clnt,
6861                 .rpc_xprt = xprt,
6862                 .callback_ops = &nfs4_bind_one_conn_to_session_ops,
6863                 .rpc_message = &msg,
6864                 .flags = RPC_TASK_TIMEOUT,
6865         };
6866         struct rpc_task *task;
6867
6868         dprintk("--> %s\n", __func__);
6869
6870         nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
6871         if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
6872                 args.dir = NFS4_CDFC4_FORE;
6873
6874         /* Do not set the backchannel flag unless this is clnt->cl_xprt */
6875         if (xprt != rcu_access_pointer(clnt->cl_xprt))
6876                 args.dir = NFS4_CDFC4_FORE;
6877
6878         task = rpc_run_task(&task_setup_data);
6879         if (!IS_ERR(task)) {
6880                 status = task->tk_status;
6881                 rpc_put_task(task);
6882         } else
6883                 status = PTR_ERR(task);
6884         trace_nfs4_bind_conn_to_session(clp, status);
6885         if (status == 0) {
6886                 if (memcmp(res.sessionid.data,
6887                     clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
6888                         dprintk("NFS: %s: Session ID mismatch\n", __func__);
6889                         status = -EIO;
6890                         goto out;
6891                 }
6892                 if ((res.dir & args.dir) != res.dir || res.dir == 0) {
6893                         dprintk("NFS: %s: Unexpected direction from server\n",
6894                                 __func__);
6895                         status = -EIO;
6896                         goto out;
6897                 }
6898                 if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
6899                         dprintk("NFS: %s: Server returned RDMA mode = true\n",
6900                                 __func__);
6901                         status = -EIO;
6902                         goto out;
6903                 }
6904         }
6905 out:
6906         dprintk("<-- %s status= %d\n", __func__, status);
6907         return status;
6908 }
6909
6910 struct rpc_bind_conn_calldata {
6911         struct nfs_client *clp;
6912         struct rpc_cred *cred;
6913 };
6914
6915 static int
6916 nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
6917                 struct rpc_xprt *xprt,
6918                 void *calldata)
6919 {
6920         struct rpc_bind_conn_calldata *p = calldata;
6921
6922         return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
6923 }
6924
6925 int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, struct rpc_cred *cred)
6926 {
6927         struct rpc_bind_conn_calldata data = {
6928                 .clp = clp,
6929                 .cred = cred,
6930         };
6931         return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
6932                         nfs4_proc_bind_conn_to_session_callback, &data);
6933 }
6934
6935 /*
6936  * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
6937  * and operations we'd like to see to enable certain features in the allow map
6938  */
6939 static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
6940         .how = SP4_MACH_CRED,
6941         .enforce.u.words = {
6942                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6943                       1 << (OP_EXCHANGE_ID - 32) |
6944                       1 << (OP_CREATE_SESSION - 32) |
6945                       1 << (OP_DESTROY_SESSION - 32) |
6946                       1 << (OP_DESTROY_CLIENTID - 32)
6947         },
6948         .allow.u.words = {
6949                 [0] = 1 << (OP_CLOSE) |
6950                       1 << (OP_OPEN_DOWNGRADE) |
6951                       1 << (OP_LOCKU) |
6952                       1 << (OP_DELEGRETURN) |
6953                       1 << (OP_COMMIT),
6954                 [1] = 1 << (OP_SECINFO - 32) |
6955                       1 << (OP_SECINFO_NO_NAME - 32) |
6956                       1 << (OP_LAYOUTRETURN - 32) |
6957                       1 << (OP_TEST_STATEID - 32) |
6958                       1 << (OP_FREE_STATEID - 32) |
6959                       1 << (OP_WRITE - 32)
6960         }
6961 };
6962
6963 /*
6964  * Select the state protection mode for client `clp' given the server results
6965  * from exchange_id in `sp'.
6966  *
6967  * Returns 0 on success, negative errno otherwise.
6968  */
6969 static int nfs4_sp4_select_mode(struct nfs_client *clp,
6970                                  struct nfs41_state_protection *sp)
6971 {
6972         static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
6973                 [1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
6974                       1 << (OP_EXCHANGE_ID - 32) |
6975                       1 << (OP_CREATE_SESSION - 32) |
6976                       1 << (OP_DESTROY_SESSION - 32) |
6977                       1 << (OP_DESTROY_CLIENTID - 32)
6978         };
6979         unsigned int i;
6980
6981         if (sp->how == SP4_MACH_CRED) {
6982                 /* Print state protect result */
6983                 dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
6984                 for (i = 0; i <= LAST_NFS4_OP; i++) {
6985                         if (test_bit(i, sp->enforce.u.longs))
6986                                 dfprintk(MOUNT, "  enforce op %d\n", i);
6987                         if (test_bit(i, sp->allow.u.longs))
6988                                 dfprintk(MOUNT, "  allow op %d\n", i);
6989                 }
6990
6991                 /* make sure nothing is on enforce list that isn't supported */
6992                 for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
6993                         if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
6994                                 dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
6995                                 return -EINVAL;
6996                         }
6997                 }
6998
6999                 /*
7000                  * Minimal mode - state operations are allowed to use machine
7001                  * credential.  Note this already happens by default, so the
7002                  * client doesn't have to do anything more than the negotiation.
7003                  *
7004                  * NOTE: we don't care if EXCHANGE_ID is in the list -
7005                  *       we're already using the machine cred for exchange_id
7006                  *       and will never use a different cred.
7007                  */
7008                 if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
7009                     test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
7010                     test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
7011                     test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
7012                         dfprintk(MOUNT, "sp4_mach_cred:\n");
7013                         dfprintk(MOUNT, "  minimal mode enabled\n");
7014                         set_bit(NFS_SP4_MACH_CRED_MINIMAL, &clp->cl_sp4_flags);
7015                 } else {
7016                         dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
7017                         return -EINVAL;
7018                 }
7019
7020                 if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
7021                     test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
7022                     test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
7023                     test_bit(OP_LOCKU, sp->allow.u.longs)) {
7024                         dfprintk(MOUNT, "  cleanup mode enabled\n");
7025                         set_bit(NFS_SP4_MACH_CRED_CLEANUP, &clp->cl_sp4_flags);
7026                 }
7027
7028                 if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
7029                         dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
7030                         set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP,
7031                                 &clp->cl_sp4_flags);
7032                 }
7033
7034                 if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
7035                     test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
7036                         dfprintk(MOUNT, "  secinfo mode enabled\n");
7037                         set_bit(NFS_SP4_MACH_CRED_SECINFO, &clp->cl_sp4_flags);
7038                 }
7039
7040                 if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
7041                     test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
7042                         dfprintk(MOUNT, "  stateid mode enabled\n");
7043                         set_bit(NFS_SP4_MACH_CRED_STATEID, &clp->cl_sp4_flags);
7044                 }
7045
7046                 if (test_bit(OP_WRITE, sp->allow.u.longs)) {
7047                         dfprintk(MOUNT, "  write mode enabled\n");
7048                         set_bit(NFS_SP4_MACH_CRED_WRITE, &clp->cl_sp4_flags);
7049                 }
7050
7051                 if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
7052                         dfprintk(MOUNT, "  commit mode enabled\n");
7053                         set_bit(NFS_SP4_MACH_CRED_COMMIT, &clp->cl_sp4_flags);
7054                 }
7055         }
7056
7057         return 0;
7058 }
7059
7060 /*
7061  * _nfs4_proc_exchange_id()
7062  *
7063  * Wrapper for EXCHANGE_ID operation.
7064  */
7065 static int _nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred,
7066         u32 sp4_how)
7067 {
7068         nfs4_verifier verifier;
7069         struct nfs41_exchange_id_args args = {
7070                 .verifier = &verifier,
7071                 .client = clp,
7072 #ifdef CONFIG_NFS_V4_1_MIGRATION
7073                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
7074                          EXCHGID4_FLAG_BIND_PRINC_STATEID |
7075                          EXCHGID4_FLAG_SUPP_MOVED_MIGR,
7076 #else
7077                 .flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
7078                          EXCHGID4_FLAG_BIND_PRINC_STATEID,
7079 #endif
7080         };
7081         struct nfs41_exchange_id_res res = {
7082                 0
7083         };
7084         int status;
7085         struct rpc_message msg = {
7086                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
7087                 .rpc_argp = &args,
7088                 .rpc_resp = &res,
7089                 .rpc_cred = cred,
7090         };
7091
7092         nfs4_init_boot_verifier(clp, &verifier);
7093
7094         status = nfs4_init_uniform_client_string(clp);
7095         if (status)
7096                 goto out;
7097
7098         dprintk("NFS call  exchange_id auth=%s, '%s'\n",
7099                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
7100                 clp->cl_owner_id);
7101
7102         res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
7103                                         GFP_NOFS);
7104         if (unlikely(res.server_owner == NULL)) {
7105                 status = -ENOMEM;
7106                 goto out;
7107         }
7108
7109         res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
7110                                         GFP_NOFS);
7111         if (unlikely(res.server_scope == NULL)) {
7112                 status = -ENOMEM;
7113                 goto out_server_owner;
7114         }
7115
7116         res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
7117         if (unlikely(res.impl_id == NULL)) {
7118                 status = -ENOMEM;
7119                 goto out_server_scope;
7120         }
7121
7122         switch (sp4_how) {
7123         case SP4_NONE:
7124                 args.state_protect.how = SP4_NONE;
7125                 break;
7126
7127         case SP4_MACH_CRED:
7128                 args.state_protect = nfs4_sp4_mach_cred_request;
7129                 break;
7130
7131         default:
7132                 /* unsupported! */
7133                 WARN_ON_ONCE(1);
7134                 status = -EINVAL;
7135                 goto out_impl_id;
7136         }
7137
7138         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7139         trace_nfs4_exchange_id(clp, status);
7140         if (status == 0)
7141                 status = nfs4_check_cl_exchange_flags(res.flags);
7142
7143         if (status == 0)
7144                 status = nfs4_sp4_select_mode(clp, &res.state_protect);
7145
7146         if (status == 0) {
7147                 clp->cl_clientid = res.clientid;
7148                 clp->cl_exchange_flags = res.flags;
7149                 /* Client ID is not confirmed */
7150                 if (!(res.flags & EXCHGID4_FLAG_CONFIRMED_R)) {
7151                         clear_bit(NFS4_SESSION_ESTABLISHED,
7152                                         &clp->cl_session->session_state);
7153                         clp->cl_seqid = res.seqid;
7154                 }
7155
7156                 kfree(clp->cl_serverowner);
7157                 clp->cl_serverowner = res.server_owner;
7158                 res.server_owner = NULL;
7159
7160                 /* use the most recent implementation id */
7161                 kfree(clp->cl_implid);
7162                 clp->cl_implid = res.impl_id;
7163                 res.impl_id = NULL;
7164
7165                 if (clp->cl_serverscope != NULL &&
7166                     !nfs41_same_server_scope(clp->cl_serverscope,
7167                                              res.server_scope)) {
7168                         dprintk("%s: server_scope mismatch detected\n",
7169                                 __func__);
7170                         set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
7171                         kfree(clp->cl_serverscope);
7172                         clp->cl_serverscope = NULL;
7173                 }
7174
7175                 if (clp->cl_serverscope == NULL) {
7176                         clp->cl_serverscope = res.server_scope;
7177                         res.server_scope = NULL;
7178                 }
7179         }
7180
7181 out_impl_id:
7182         kfree(res.impl_id);
7183 out_server_scope:
7184         kfree(res.server_scope);
7185 out_server_owner:
7186         kfree(res.server_owner);
7187 out:
7188         if (clp->cl_implid != NULL)
7189                 dprintk("NFS reply exchange_id: Server Implementation ID: "
7190                         "domain: %s, name: %s, date: %llu,%u\n",
7191                         clp->cl_implid->domain, clp->cl_implid->name,
7192                         clp->cl_implid->date.seconds,
7193                         clp->cl_implid->date.nseconds);
7194         dprintk("NFS reply exchange_id: %d\n", status);
7195         return status;
7196 }
7197
7198 /*
7199  * nfs4_proc_exchange_id()
7200  *
7201  * Returns zero, a negative errno, or a negative NFS4ERR status code.
7202  *
7203  * Since the clientid has expired, all compounds using sessions
7204  * associated with the stale clientid will be returning
7205  * NFS4ERR_BADSESSION in the sequence operation, and will therefore
7206  * be in some phase of session reset.
7207  *
7208  * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
7209  */
7210 int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
7211 {
7212         rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
7213         int status;
7214
7215         /* try SP4_MACH_CRED if krb5i/p */
7216         if (authflavor == RPC_AUTH_GSS_KRB5I ||
7217             authflavor == RPC_AUTH_GSS_KRB5P) {
7218                 status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
7219                 if (!status)
7220                         return 0;
7221         }
7222
7223         /* try SP4_NONE */
7224         return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
7225 }
7226
7227 static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
7228                 struct rpc_cred *cred)
7229 {
7230         struct rpc_message msg = {
7231                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
7232                 .rpc_argp = clp,
7233                 .rpc_cred = cred,
7234         };
7235         int status;
7236
7237         status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7238         trace_nfs4_destroy_clientid(clp, status);
7239         if (status)
7240                 dprintk("NFS: Got error %d from the server %s on "
7241                         "DESTROY_CLIENTID.", status, clp->cl_hostname);
7242         return status;
7243 }
7244
7245 static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
7246                 struct rpc_cred *cred)
7247 {
7248         unsigned int loop;
7249         int ret;
7250
7251         for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
7252                 ret = _nfs4_proc_destroy_clientid(clp, cred);
7253                 switch (ret) {
7254                 case -NFS4ERR_DELAY:
7255                 case -NFS4ERR_CLIENTID_BUSY:
7256                         ssleep(1);
7257                         break;
7258                 default:
7259                         return ret;
7260                 }
7261         }
7262         return 0;
7263 }
7264
7265 int nfs4_destroy_clientid(struct nfs_client *clp)
7266 {
7267         struct rpc_cred *cred;
7268         int ret = 0;
7269
7270         if (clp->cl_mvops->minor_version < 1)
7271                 goto out;
7272         if (clp->cl_exchange_flags == 0)
7273                 goto out;
7274         if (clp->cl_preserve_clid)
7275                 goto out;
7276         cred = nfs4_get_clid_cred(clp);
7277         ret = nfs4_proc_destroy_clientid(clp, cred);
7278         if (cred)
7279                 put_rpccred(cred);
7280         switch (ret) {
7281         case 0:
7282         case -NFS4ERR_STALE_CLIENTID:
7283                 clp->cl_exchange_flags = 0;
7284         }
7285 out:
7286         return ret;
7287 }
7288
7289 struct nfs4_get_lease_time_data {
7290         struct nfs4_get_lease_time_args *args;
7291         struct nfs4_get_lease_time_res *res;
7292         struct nfs_client *clp;
7293 };
7294
7295 static void nfs4_get_lease_time_prepare(struct rpc_task *task,
7296                                         void *calldata)
7297 {
7298         struct nfs4_get_lease_time_data *data =
7299                         (struct nfs4_get_lease_time_data *)calldata;
7300
7301         dprintk("--> %s\n", __func__);
7302         /* just setup sequence, do not trigger session recovery
7303            since we're invoked within one */
7304         nfs41_setup_sequence(data->clp->cl_session,
7305                         &data->args->la_seq_args,
7306                         &data->res->lr_seq_res,
7307                         task);
7308         dprintk("<-- %s\n", __func__);
7309 }
7310
7311 /*
7312  * Called from nfs4_state_manager thread for session setup, so don't recover
7313  * from sequence operation or clientid errors.
7314  */
7315 static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
7316 {
7317         struct nfs4_get_lease_time_data *data =
7318                         (struct nfs4_get_lease_time_data *)calldata;
7319
7320         dprintk("--> %s\n", __func__);
7321         if (!nfs41_sequence_done(task, &data->res->lr_seq_res))
7322                 return;
7323         switch (task->tk_status) {
7324         case -NFS4ERR_DELAY:
7325         case -NFS4ERR_GRACE:
7326                 dprintk("%s Retry: tk_status %d\n", __func__, task->tk_status);
7327                 rpc_delay(task, NFS4_POLL_RETRY_MIN);
7328                 task->tk_status = 0;
7329                 /* fall through */
7330         case -NFS4ERR_RETRY_UNCACHED_REP:
7331                 rpc_restart_call_prepare(task);
7332                 return;
7333         }
7334         dprintk("<-- %s\n", __func__);
7335 }
7336
7337 static const struct rpc_call_ops nfs4_get_lease_time_ops = {
7338         .rpc_call_prepare = nfs4_get_lease_time_prepare,
7339         .rpc_call_done = nfs4_get_lease_time_done,
7340 };
7341
7342 int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
7343 {
7344         struct rpc_task *task;
7345         struct nfs4_get_lease_time_args args;
7346         struct nfs4_get_lease_time_res res = {
7347                 .lr_fsinfo = fsinfo,
7348         };
7349         struct nfs4_get_lease_time_data data = {
7350                 .args = &args,
7351                 .res = &res,
7352                 .clp = clp,
7353         };
7354         struct rpc_message msg = {
7355                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
7356                 .rpc_argp = &args,
7357                 .rpc_resp = &res,
7358         };
7359         struct rpc_task_setup task_setup = {
7360                 .rpc_client = clp->cl_rpcclient,
7361                 .rpc_message = &msg,
7362                 .callback_ops = &nfs4_get_lease_time_ops,
7363                 .callback_data = &data,
7364                 .flags = RPC_TASK_TIMEOUT,
7365         };
7366         int status;
7367
7368         nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0);
7369         nfs4_set_sequence_privileged(&args.la_seq_args);
7370         dprintk("--> %s\n", __func__);
7371         task = rpc_run_task(&task_setup);
7372
7373         if (IS_ERR(task))
7374                 status = PTR_ERR(task);
7375         else {
7376                 status = task->tk_status;
7377                 rpc_put_task(task);
7378         }
7379         dprintk("<-- %s return %d\n", __func__, status);
7380
7381         return status;
7382 }
7383
7384 /*
7385  * Initialize the values to be used by the client in CREATE_SESSION
7386  * If nfs4_init_session set the fore channel request and response sizes,
7387  * use them.
7388  *
7389  * Set the back channel max_resp_sz_cached to zero to force the client to
7390  * always set csa_cachethis to FALSE because the current implementation
7391  * of the back channel DRC only supports caching the CB_SEQUENCE operation.
7392  */
7393 static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
7394                                     struct rpc_clnt *clnt)
7395 {
7396         unsigned int max_rqst_sz, max_resp_sz;
7397         unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
7398
7399         max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
7400         max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
7401
7402         /* Fore channel attributes */
7403         args->fc_attrs.max_rqst_sz = max_rqst_sz;
7404         args->fc_attrs.max_resp_sz = max_resp_sz;
7405         args->fc_attrs.max_ops = NFS4_MAX_OPS;
7406         args->fc_attrs.max_reqs = max_session_slots;
7407
7408         dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
7409                 "max_ops=%u max_reqs=%u\n",
7410                 __func__,
7411                 args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
7412                 args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
7413
7414         /* Back channel attributes */
7415         args->bc_attrs.max_rqst_sz = max_bc_payload;
7416         args->bc_attrs.max_resp_sz = max_bc_payload;
7417         args->bc_attrs.max_resp_sz_cached = 0;
7418         args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
7419         args->bc_attrs.max_reqs = NFS41_BC_MAX_CALLBACKS;
7420
7421         dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
7422                 "max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
7423                 __func__,
7424                 args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
7425                 args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
7426                 args->bc_attrs.max_reqs);
7427 }
7428
7429 static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
7430                 struct nfs41_create_session_res *res)
7431 {
7432         struct nfs4_channel_attrs *sent = &args->fc_attrs;
7433         struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
7434
7435         if (rcvd->max_resp_sz > sent->max_resp_sz)
7436                 return -EINVAL;
7437         /*
7438          * Our requested max_ops is the minimum we need; we're not
7439          * prepared to break up compounds into smaller pieces than that.
7440          * So, no point even trying to continue if the server won't
7441          * cooperate:
7442          */
7443         if (rcvd->max_ops < sent->max_ops)
7444                 return -EINVAL;
7445         if (rcvd->max_reqs == 0)
7446                 return -EINVAL;
7447         if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
7448                 rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
7449         return 0;
7450 }
7451
7452 static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
7453                 struct nfs41_create_session_res *res)
7454 {
7455         struct nfs4_channel_attrs *sent = &args->bc_attrs;
7456         struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
7457
7458         if (!(res->flags & SESSION4_BACK_CHAN))
7459                 goto out;
7460         if (rcvd->max_rqst_sz > sent->max_rqst_sz)
7461                 return -EINVAL;
7462         if (rcvd->max_resp_sz < sent->max_resp_sz)
7463                 return -EINVAL;
7464         if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
7465                 return -EINVAL;
7466         /* These would render the backchannel useless: */
7467         if (rcvd->max_ops != sent->max_ops)
7468                 return -EINVAL;
7469         if (rcvd->max_reqs != sent->max_reqs)
7470                 return -EINVAL;
7471 out:
7472         return 0;
7473 }
7474
7475 static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
7476                                      struct nfs41_create_session_res *res)
7477 {
7478         int ret;
7479
7480         ret = nfs4_verify_fore_channel_attrs(args, res);
7481         if (ret)
7482                 return ret;
7483         return nfs4_verify_back_channel_attrs(args, res);
7484 }
7485
7486 static void nfs4_update_session(struct nfs4_session *session,
7487                 struct nfs41_create_session_res *res)
7488 {
7489         nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
7490         /* Mark client id and session as being confirmed */
7491         session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
7492         set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
7493         session->flags = res->flags;
7494         memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
7495         if (res->flags & SESSION4_BACK_CHAN)
7496                 memcpy(&session->bc_attrs, &res->bc_attrs,
7497                                 sizeof(session->bc_attrs));
7498 }
7499
7500 static int _nfs4_proc_create_session(struct nfs_client *clp,
7501                 struct rpc_cred *cred)
7502 {
7503         struct nfs4_session *session = clp->cl_session;
7504         struct nfs41_create_session_args args = {
7505                 .client = clp,
7506                 .clientid = clp->cl_clientid,
7507                 .seqid = clp->cl_seqid,
7508                 .cb_program = NFS4_CALLBACK,
7509         };
7510         struct nfs41_create_session_res res;
7511
7512         struct rpc_message msg = {
7513                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
7514                 .rpc_argp = &args,
7515                 .rpc_resp = &res,
7516                 .rpc_cred = cred,
7517         };
7518         int status;
7519
7520         nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
7521         args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
7522
7523         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7524         trace_nfs4_create_session(clp, status);
7525
7526         if (!status) {
7527                 /* Verify the session's negotiated channel_attrs values */
7528                 status = nfs4_verify_channel_attrs(&args, &res);
7529                 /* Increment the clientid slot sequence id */
7530                 if (clp->cl_seqid == res.seqid)
7531                         clp->cl_seqid++;
7532                 if (status)
7533                         goto out;
7534                 nfs4_update_session(session, &res);
7535         }
7536 out:
7537         return status;
7538 }
7539
7540 /*
7541  * Issues a CREATE_SESSION operation to the server.
7542  * It is the responsibility of the caller to verify the session is
7543  * expired before calling this routine.
7544  */
7545 int nfs4_proc_create_session(struct nfs_client *clp, struct rpc_cred *cred)
7546 {
7547         int status;
7548         unsigned *ptr;
7549         struct nfs4_session *session = clp->cl_session;
7550
7551         dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
7552
7553         status = _nfs4_proc_create_session(clp, cred);
7554         if (status)
7555                 goto out;
7556
7557         /* Init or reset the session slot tables */
7558         status = nfs4_setup_session_slot_tables(session);
7559         dprintk("slot table setup returned %d\n", status);
7560         if (status)
7561                 goto out;
7562
7563         ptr = (unsigned *)&session->sess_id.data[0];
7564         dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
7565                 clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
7566 out:
7567         dprintk("<-- %s\n", __func__);
7568         return status;
7569 }
7570
7571 /*
7572  * Issue the over-the-wire RPC DESTROY_SESSION.
7573  * The caller must serialize access to this routine.
7574  */
7575 int nfs4_proc_destroy_session(struct nfs4_session *session,
7576                 struct rpc_cred *cred)
7577 {
7578         struct rpc_message msg = {
7579                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
7580                 .rpc_argp = session,
7581                 .rpc_cred = cred,
7582         };
7583         int status = 0;
7584
7585         dprintk("--> nfs4_proc_destroy_session\n");
7586
7587         /* session is still being setup */
7588         if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
7589                 return 0;
7590
7591         status = rpc_call_sync(session->clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
7592         trace_nfs4_destroy_session(session->clp, status);
7593
7594         if (status)
7595                 dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
7596                         "Session has been destroyed regardless...\n", status);
7597
7598         dprintk("<-- nfs4_proc_destroy_session\n");
7599         return status;
7600 }
7601
7602 /*
7603  * Renew the cl_session lease.
7604  */
7605 struct nfs4_sequence_data {
7606         struct nfs_client *clp;
7607         struct nfs4_sequence_args args;
7608         struct nfs4_sequence_res res;
7609 };
7610
7611 static void nfs41_sequence_release(void *data)
7612 {
7613         struct nfs4_sequence_data *calldata = data;
7614         struct nfs_client *clp = calldata->clp;
7615
7616         if (atomic_read(&clp->cl_count) > 1)
7617                 nfs4_schedule_state_renewal(clp);
7618         nfs_put_client(clp);
7619         kfree(calldata);
7620 }
7621
7622 static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7623 {
7624         switch(task->tk_status) {
7625         case -NFS4ERR_DELAY:
7626                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7627                 return -EAGAIN;
7628         default:
7629                 nfs4_schedule_lease_recovery(clp);
7630         }
7631         return 0;
7632 }
7633
7634 static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
7635 {
7636         struct nfs4_sequence_data *calldata = data;
7637         struct nfs_client *clp = calldata->clp;
7638
7639         if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
7640                 return;
7641
7642         trace_nfs4_sequence(clp, task->tk_status);
7643         if (task->tk_status < 0) {
7644                 dprintk("%s ERROR %d\n", __func__, task->tk_status);
7645                 if (atomic_read(&clp->cl_count) == 1)
7646                         goto out;
7647
7648                 if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
7649                         rpc_restart_call_prepare(task);
7650                         return;
7651                 }
7652         }
7653         dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
7654 out:
7655         dprintk("<-- %s\n", __func__);
7656 }
7657
7658 static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
7659 {
7660         struct nfs4_sequence_data *calldata = data;
7661         struct nfs_client *clp = calldata->clp;
7662         struct nfs4_sequence_args *args;
7663         struct nfs4_sequence_res *res;
7664
7665         args = task->tk_msg.rpc_argp;
7666         res = task->tk_msg.rpc_resp;
7667
7668         nfs41_setup_sequence(clp->cl_session, args, res, task);
7669 }
7670
7671 static const struct rpc_call_ops nfs41_sequence_ops = {
7672         .rpc_call_done = nfs41_sequence_call_done,
7673         .rpc_call_prepare = nfs41_sequence_prepare,
7674         .rpc_release = nfs41_sequence_release,
7675 };
7676
7677 static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
7678                 struct rpc_cred *cred,
7679                 bool is_privileged)
7680 {
7681         struct nfs4_sequence_data *calldata;
7682         struct rpc_message msg = {
7683                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
7684                 .rpc_cred = cred,
7685         };
7686         struct rpc_task_setup task_setup_data = {
7687                 .rpc_client = clp->cl_rpcclient,
7688                 .rpc_message = &msg,
7689                 .callback_ops = &nfs41_sequence_ops,
7690                 .flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
7691         };
7692
7693         if (!atomic_inc_not_zero(&clp->cl_count))
7694                 return ERR_PTR(-EIO);
7695         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7696         if (calldata == NULL) {
7697                 nfs_put_client(clp);
7698                 return ERR_PTR(-ENOMEM);
7699         }
7700         nfs4_init_sequence(&calldata->args, &calldata->res, 0);
7701         if (is_privileged)
7702                 nfs4_set_sequence_privileged(&calldata->args);
7703         msg.rpc_argp = &calldata->args;
7704         msg.rpc_resp = &calldata->res;
7705         calldata->clp = clp;
7706         task_setup_data.callback_data = calldata;
7707
7708         return rpc_run_task(&task_setup_data);
7709 }
7710
7711 static int nfs41_proc_async_sequence(struct nfs_client *clp, struct rpc_cred *cred, unsigned renew_flags)
7712 {
7713         struct rpc_task *task;
7714         int ret = 0;
7715
7716         if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
7717                 return -EAGAIN;
7718         task = _nfs41_proc_sequence(clp, cred, false);
7719         if (IS_ERR(task))
7720                 ret = PTR_ERR(task);
7721         else
7722                 rpc_put_task_async(task);
7723         dprintk("<-- %s status=%d\n", __func__, ret);
7724         return ret;
7725 }
7726
7727 static int nfs4_proc_sequence(struct nfs_client *clp, struct rpc_cred *cred)
7728 {
7729         struct rpc_task *task;
7730         int ret;
7731
7732         task = _nfs41_proc_sequence(clp, cred, true);
7733         if (IS_ERR(task)) {
7734                 ret = PTR_ERR(task);
7735                 goto out;
7736         }
7737         ret = rpc_wait_for_completion_task(task);
7738         if (!ret)
7739                 ret = task->tk_status;
7740         rpc_put_task(task);
7741 out:
7742         dprintk("<-- %s status=%d\n", __func__, ret);
7743         return ret;
7744 }
7745
7746 struct nfs4_reclaim_complete_data {
7747         struct nfs_client *clp;
7748         struct nfs41_reclaim_complete_args arg;
7749         struct nfs41_reclaim_complete_res res;
7750 };
7751
7752 static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
7753 {
7754         struct nfs4_reclaim_complete_data *calldata = data;
7755
7756         nfs41_setup_sequence(calldata->clp->cl_session,
7757                         &calldata->arg.seq_args,
7758                         &calldata->res.seq_res,
7759                         task);
7760 }
7761
7762 static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
7763 {
7764         switch(task->tk_status) {
7765         case 0:
7766         case -NFS4ERR_COMPLETE_ALREADY:
7767         case -NFS4ERR_WRONG_CRED: /* What to do here? */
7768                 break;
7769         case -NFS4ERR_DELAY:
7770                 rpc_delay(task, NFS4_POLL_RETRY_MAX);
7771                 /* fall through */
7772         case -NFS4ERR_RETRY_UNCACHED_REP:
7773                 return -EAGAIN;
7774         default:
7775                 nfs4_schedule_lease_recovery(clp);
7776         }
7777         return 0;
7778 }
7779
7780 static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
7781 {
7782         struct nfs4_reclaim_complete_data *calldata = data;
7783         struct nfs_client *clp = calldata->clp;
7784         struct nfs4_sequence_res *res = &calldata->res.seq_res;
7785
7786         dprintk("--> %s\n", __func__);
7787         if (!nfs41_sequence_done(task, res))
7788                 return;
7789
7790         trace_nfs4_reclaim_complete(clp, task->tk_status);
7791         if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
7792                 rpc_restart_call_prepare(task);
7793                 return;
7794         }
7795         dprintk("<-- %s\n", __func__);
7796 }
7797
7798 static void nfs4_free_reclaim_complete_data(void *data)
7799 {
7800         struct nfs4_reclaim_complete_data *calldata = data;
7801
7802         kfree(calldata);
7803 }
7804
7805 static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
7806         .rpc_call_prepare = nfs4_reclaim_complete_prepare,
7807         .rpc_call_done = nfs4_reclaim_complete_done,
7808         .rpc_release = nfs4_free_reclaim_complete_data,
7809 };
7810
7811 /*
7812  * Issue a global reclaim complete.
7813  */
7814 static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
7815                 struct rpc_cred *cred)
7816 {
7817         struct nfs4_reclaim_complete_data *calldata;
7818         struct rpc_task *task;
7819         struct rpc_message msg = {
7820                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
7821                 .rpc_cred = cred,
7822         };
7823         struct rpc_task_setup task_setup_data = {
7824                 .rpc_client = clp->cl_rpcclient,
7825                 .rpc_message = &msg,
7826                 .callback_ops = &nfs4_reclaim_complete_call_ops,
7827                 .flags = RPC_TASK_ASYNC,
7828         };
7829         int status = -ENOMEM;
7830
7831         dprintk("--> %s\n", __func__);
7832         calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
7833         if (calldata == NULL)
7834                 goto out;
7835         calldata->clp = clp;
7836         calldata->arg.one_fs = 0;
7837
7838         nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0);
7839         nfs4_set_sequence_privileged(&calldata->arg.seq_args);
7840         msg.rpc_argp = &calldata->arg;
7841         msg.rpc_resp = &calldata->res;
7842         task_setup_data.callback_data = calldata;
7843         task = rpc_run_task(&task_setup_data);
7844         if (IS_ERR(task)) {
7845                 status = PTR_ERR(task);
7846                 goto out;
7847         }
7848         status = nfs4_wait_for_completion_rpc_task(task);
7849         if (status == 0)
7850                 status = task->tk_status;
7851         rpc_put_task(task);
7852         return 0;
7853 out:
7854         dprintk("<-- %s status=%d\n", __func__, status);
7855         return status;
7856 }
7857
7858 static void
7859 nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
7860 {
7861         struct nfs4_layoutget *lgp = calldata;
7862         struct nfs_server *server = NFS_SERVER(lgp->args.inode);
7863         struct nfs4_session *session = nfs4_get_session(server);
7864
7865         dprintk("--> %s\n", __func__);
7866         nfs41_setup_sequence(session, &lgp->args.seq_args,
7867                                 &lgp->res.seq_res, task);
7868         dprintk("<-- %s\n", __func__);
7869 }
7870
7871 static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
7872 {
7873         struct nfs4_layoutget *lgp = calldata;
7874
7875         dprintk("--> %s\n", __func__);
7876         nfs41_sequence_done(task, &lgp->res.seq_res);
7877         dprintk("<-- %s\n", __func__);
7878 }
7879
7880 static int
7881 nfs4_layoutget_handle_exception(struct rpc_task *task,
7882                 struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
7883 {
7884         struct inode *inode = lgp->args.inode;
7885         struct nfs_server *server = NFS_SERVER(inode);
7886         struct pnfs_layout_hdr *lo;
7887         int nfs4err = task->tk_status;
7888         int err, status = 0;
7889
7890         dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
7891
7892         switch (nfs4err) {
7893         case 0:
7894                 goto out;
7895
7896         /*
7897          * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
7898          * on the file. set tk_status to -ENODATA to tell upper layer to
7899          * retry go inband.
7900          */
7901         case -NFS4ERR_LAYOUTUNAVAILABLE:
7902                 status = -ENODATA;
7903                 goto out;
7904         /*
7905          * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
7906          * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
7907          */
7908         case -NFS4ERR_BADLAYOUT:
7909                 status = -EOVERFLOW;
7910                 goto out;
7911         /*
7912          * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
7913          * (or clients) writing to the same RAID stripe except when
7914          * the minlength argument is 0 (see RFC5661 section 18.43.3).
7915          *
7916          * Treat it like we would RECALLCONFLICT -- we retry for a little
7917          * while, and then eventually give up.
7918          */
7919         case -NFS4ERR_LAYOUTTRYLATER:
7920                 if (lgp->args.minlength == 0) {
7921                         status = -EOVERFLOW;
7922                         goto out;
7923                 }
7924                 status = -EBUSY;
7925                 break;
7926         case -NFS4ERR_RECALLCONFLICT:
7927                 status = -ERECALLCONFLICT;
7928                 break;
7929         case -NFS4ERR_EXPIRED:
7930         case -NFS4ERR_BAD_STATEID:
7931                 exception->timeout = 0;
7932                 spin_lock(&inode->i_lock);
7933                 if (nfs4_stateid_match(&lgp->args.stateid,
7934                                         &lgp->args.ctx->state->stateid)) {
7935                         spin_unlock(&inode->i_lock);
7936                         /* If the open stateid was bad, then recover it. */
7937                         exception->state = lgp->args.ctx->state;
7938                         break;
7939                 }
7940                 lo = NFS_I(inode)->layout;
7941                 if (lo && !test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) &&
7942                     nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
7943                         LIST_HEAD(head);
7944
7945                         /*
7946                          * Mark the bad layout state as invalid, then retry
7947                          * with the current stateid.
7948                          */
7949                         set_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags);
7950                         pnfs_mark_matching_lsegs_invalid(lo, &head, NULL, 0);
7951                         spin_unlock(&inode->i_lock);
7952                         pnfs_free_lseg_list(&head);
7953                         status = -EAGAIN;
7954                         goto out;
7955                 } else
7956                         spin_unlock(&inode->i_lock);
7957         }
7958
7959         err = nfs4_handle_exception(server, nfs4err, exception);
7960         if (!status) {
7961                 if (exception->retry)
7962                         status = -EAGAIN;
7963                 else
7964                         status = err;
7965         }
7966 out:
7967         dprintk("<-- %s\n", __func__);
7968         return status;
7969 }
7970
7971 static size_t max_response_pages(struct nfs_server *server)
7972 {
7973         u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
7974         return nfs_page_array_len(0, max_resp_sz);
7975 }
7976
7977 static void nfs4_free_pages(struct page **pages, size_t size)
7978 {
7979         int i;
7980
7981         if (!pages)
7982                 return;
7983
7984         for (i = 0; i < size; i++) {
7985                 if (!pages[i])
7986                         break;
7987                 __free_page(pages[i]);
7988         }
7989         kfree(pages);
7990 }
7991
7992 static struct page **nfs4_alloc_pages(size_t size, gfp_t gfp_flags)
7993 {
7994         struct page **pages;
7995         int i;
7996
7997         pages = kcalloc(size, sizeof(struct page *), gfp_flags);
7998         if (!pages) {
7999                 dprintk("%s: can't alloc array of %zu pages\n", __func__, size);
8000                 return NULL;
8001         }
8002
8003         for (i = 0; i < size; i++) {
8004                 pages[i] = alloc_page(gfp_flags);
8005                 if (!pages[i]) {
8006                         dprintk("%s: failed to allocate page\n", __func__);
8007                         nfs4_free_pages(pages, size);
8008                         return NULL;
8009                 }
8010         }
8011
8012         return pages;
8013 }
8014
8015 static void nfs4_layoutget_release(void *calldata)
8016 {
8017         struct nfs4_layoutget *lgp = calldata;
8018         struct inode *inode = lgp->args.inode;
8019         struct nfs_server *server = NFS_SERVER(inode);
8020         size_t max_pages = max_response_pages(server);
8021
8022         dprintk("--> %s\n", __func__);
8023         nfs4_free_pages(lgp->args.layout.pages, max_pages);
8024         pnfs_put_layout_hdr(NFS_I(inode)->layout);
8025         put_nfs_open_context(lgp->args.ctx);
8026         kfree(calldata);
8027         dprintk("<-- %s\n", __func__);
8028 }
8029
8030 static const struct rpc_call_ops nfs4_layoutget_call_ops = {
8031         .rpc_call_prepare = nfs4_layoutget_prepare,
8032         .rpc_call_done = nfs4_layoutget_done,
8033         .rpc_release = nfs4_layoutget_release,
8034 };
8035
8036 struct pnfs_layout_segment *
8037 nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout, gfp_t gfp_flags)
8038 {
8039         struct inode *inode = lgp->args.inode;
8040         struct nfs_server *server = NFS_SERVER(inode);
8041         size_t max_pages = max_response_pages(server);
8042         struct rpc_task *task;
8043         struct rpc_message msg = {
8044                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
8045                 .rpc_argp = &lgp->args,
8046                 .rpc_resp = &lgp->res,
8047                 .rpc_cred = lgp->cred,
8048         };
8049         struct rpc_task_setup task_setup_data = {
8050                 .rpc_client = server->client,
8051                 .rpc_message = &msg,
8052                 .callback_ops = &nfs4_layoutget_call_ops,
8053                 .callback_data = lgp,
8054                 .flags = RPC_TASK_ASYNC,
8055         };
8056         struct pnfs_layout_segment *lseg = NULL;
8057         struct nfs4_exception exception = {
8058                 .inode = inode,
8059                 .timeout = *timeout,
8060         };
8061         int status = 0;
8062
8063         dprintk("--> %s\n", __func__);
8064
8065         /* nfs4_layoutget_release calls pnfs_put_layout_hdr */
8066         pnfs_get_layout_hdr(NFS_I(inode)->layout);
8067
8068         lgp->args.layout.pages = nfs4_alloc_pages(max_pages, gfp_flags);
8069         if (!lgp->args.layout.pages) {
8070                 nfs4_layoutget_release(lgp);
8071                 return ERR_PTR(-ENOMEM);
8072         }
8073         lgp->args.layout.pglen = max_pages * PAGE_SIZE;
8074
8075         lgp->res.layoutp = &lgp->args.layout;
8076         lgp->res.seq_res.sr_slot = NULL;
8077         nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0);
8078
8079         task = rpc_run_task(&task_setup_data);
8080         if (IS_ERR(task))
8081                 return ERR_CAST(task);
8082         status = nfs4_wait_for_completion_rpc_task(task);
8083         if (status == 0) {
8084                 status = nfs4_layoutget_handle_exception(task, lgp, &exception);
8085                 *timeout = exception.timeout;
8086         }
8087
8088         trace_nfs4_layoutget(lgp->args.ctx,
8089                         &lgp->args.range,
8090                         &lgp->res.range,
8091                         &lgp->res.stateid,
8092                         status);
8093
8094         /* if layoutp->len is 0, nfs4_layoutget_prepare called rpc_exit */
8095         if (status == 0 && lgp->res.layoutp->len)
8096                 lseg = pnfs_layout_process(lgp);
8097         rpc_put_task(task);
8098         dprintk("<-- %s status=%d\n", __func__, status);
8099         if (status)
8100                 return ERR_PTR(status);
8101         return lseg;
8102 }
8103
8104 static void
8105 nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
8106 {
8107         struct nfs4_layoutreturn *lrp = calldata;
8108
8109         dprintk("--> %s\n", __func__);
8110         nfs41_setup_sequence(lrp->clp->cl_session,
8111                         &lrp->args.seq_args,
8112                         &lrp->res.seq_res,
8113                         task);
8114 }
8115
8116 static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
8117 {
8118         struct nfs4_layoutreturn *lrp = calldata;
8119         struct nfs_server *server;
8120
8121         dprintk("--> %s\n", __func__);
8122
8123         if (!nfs41_sequence_done(task, &lrp->res.seq_res))
8124                 return;
8125
8126         server = NFS_SERVER(lrp->args.inode);
8127         switch (task->tk_status) {
8128         default:
8129                 task->tk_status = 0;
8130         case 0:
8131                 break;
8132         case -NFS4ERR_DELAY:
8133                 if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
8134                         break;
8135                 rpc_restart_call_prepare(task);
8136                 return;
8137         }
8138         dprintk("<-- %s\n", __func__);
8139 }
8140
8141 static void nfs4_layoutreturn_release(void *calldata)
8142 {
8143         struct nfs4_layoutreturn *lrp = calldata;
8144         struct pnfs_layout_hdr *lo = lrp->args.layout;
8145         LIST_HEAD(freeme);
8146
8147         dprintk("--> %s\n", __func__);
8148         spin_lock(&lo->plh_inode->i_lock);
8149         pnfs_mark_matching_lsegs_invalid(lo, &freeme, &lrp->args.range,
8150                         be32_to_cpu(lrp->args.stateid.seqid));
8151         pnfs_mark_layout_returned_if_empty(lo);
8152         if (lrp->res.lrs_present)
8153                 pnfs_set_layout_stateid(lo, &lrp->res.stateid, true);
8154         pnfs_clear_layoutreturn_waitbit(lo);
8155         spin_unlock(&lo->plh_inode->i_lock);
8156         pnfs_free_lseg_list(&freeme);
8157         pnfs_put_layout_hdr(lrp->args.layout);
8158         nfs_iput_and_deactive(lrp->inode);
8159         kfree(calldata);
8160         dprintk("<-- %s\n", __func__);
8161 }
8162
8163 static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
8164         .rpc_call_prepare = nfs4_layoutreturn_prepare,
8165         .rpc_call_done = nfs4_layoutreturn_done,
8166         .rpc_release = nfs4_layoutreturn_release,
8167 };
8168
8169 int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
8170 {
8171         struct rpc_task *task;
8172         struct rpc_message msg = {
8173                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
8174                 .rpc_argp = &lrp->args,
8175                 .rpc_resp = &lrp->res,
8176                 .rpc_cred = lrp->cred,
8177         };
8178         struct rpc_task_setup task_setup_data = {
8179                 .rpc_client = NFS_SERVER(lrp->args.inode)->client,
8180                 .rpc_message = &msg,
8181                 .callback_ops = &nfs4_layoutreturn_call_ops,
8182                 .callback_data = lrp,
8183         };
8184         int status = 0;
8185
8186         nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
8187                         NFS_SP4_MACH_CRED_PNFS_CLEANUP,
8188                         &task_setup_data.rpc_client, &msg);
8189
8190         dprintk("--> %s\n", __func__);
8191         if (!sync) {
8192                 lrp->inode = nfs_igrab_and_active(lrp->args.inode);
8193                 if (!lrp->inode) {
8194                         nfs4_layoutreturn_release(lrp);
8195                         return -EAGAIN;
8196                 }
8197                 task_setup_data.flags |= RPC_TASK_ASYNC;
8198         }
8199         nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1);
8200         task = rpc_run_task(&task_setup_data);
8201         if (IS_ERR(task))
8202                 return PTR_ERR(task);
8203         if (sync)
8204                 status = task->tk_status;
8205         trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
8206         dprintk("<-- %s status=%d\n", __func__, status);
8207         rpc_put_task(task);
8208         return status;
8209 }
8210
8211 static int
8212 _nfs4_proc_getdeviceinfo(struct nfs_server *server,
8213                 struct pnfs_device *pdev,
8214                 struct rpc_cred *cred)
8215 {
8216         struct nfs4_getdeviceinfo_args args = {
8217                 .pdev = pdev,
8218                 .notify_types = NOTIFY_DEVICEID4_CHANGE |
8219                         NOTIFY_DEVICEID4_DELETE,
8220         };
8221         struct nfs4_getdeviceinfo_res res = {
8222                 .pdev = pdev,
8223         };
8224         struct rpc_message msg = {
8225                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
8226                 .rpc_argp = &args,
8227                 .rpc_resp = &res,
8228                 .rpc_cred = cred,
8229         };
8230         int status;
8231
8232         dprintk("--> %s\n", __func__);
8233         status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
8234         if (res.notification & ~args.notify_types)
8235                 dprintk("%s: unsupported notification\n", __func__);
8236         if (res.notification != args.notify_types)
8237                 pdev->nocache = 1;
8238
8239         dprintk("<-- %s status=%d\n", __func__, status);
8240
8241         return status;
8242 }
8243
8244 int nfs4_proc_getdeviceinfo(struct nfs_server *server,
8245                 struct pnfs_device *pdev,
8246                 struct rpc_cred *cred)
8247 {
8248         struct nfs4_exception exception = { };
8249         int err;
8250
8251         do {
8252                 err = nfs4_handle_exception(server,
8253                                         _nfs4_proc_getdeviceinfo(server, pdev, cred),
8254                                         &exception);
8255         } while (exception.retry);
8256         return err;
8257 }
8258 EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
8259
8260 static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
8261 {
8262         struct nfs4_layoutcommit_data *data = calldata;
8263         struct nfs_server *server = NFS_SERVER(data->args.inode);
8264         struct nfs4_session *session = nfs4_get_session(server);
8265
8266         nfs41_setup_sequence(session,
8267                         &data->args.seq_args,
8268                         &data->res.seq_res,
8269                         task);
8270 }
8271
8272 static void
8273 nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
8274 {
8275         struct nfs4_layoutcommit_data *data = calldata;
8276         struct nfs_server *server = NFS_SERVER(data->args.inode);
8277
8278         if (!nfs41_sequence_done(task, &data->res.seq_res))
8279                 return;
8280
8281         switch (task->tk_status) { /* Just ignore these failures */
8282         case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
8283         case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
8284         case -NFS4ERR_BADLAYOUT:     /* no layout */
8285         case -NFS4ERR_GRACE:        /* loca_recalim always false */
8286                 task->tk_status = 0;
8287         case 0:
8288                 break;
8289         default:
8290                 if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
8291                         rpc_restart_call_prepare(task);
8292                         return;
8293                 }
8294         }
8295 }
8296
8297 static void nfs4_layoutcommit_release(void *calldata)
8298 {
8299         struct nfs4_layoutcommit_data *data = calldata;
8300
8301         pnfs_cleanup_layoutcommit(data);
8302         nfs_post_op_update_inode_force_wcc(data->args.inode,
8303                                            data->res.fattr);
8304         put_rpccred(data->cred);
8305         nfs_iput_and_deactive(data->inode);
8306         kfree(data);
8307 }
8308
8309 static const struct rpc_call_ops nfs4_layoutcommit_ops = {
8310         .rpc_call_prepare = nfs4_layoutcommit_prepare,
8311         .rpc_call_done = nfs4_layoutcommit_done,
8312         .rpc_release = nfs4_layoutcommit_release,
8313 };
8314
8315 int
8316 nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
8317 {
8318         struct rpc_message msg = {
8319                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
8320                 .rpc_argp = &data->args,
8321                 .rpc_resp = &data->res,
8322                 .rpc_cred = data->cred,
8323         };
8324         struct rpc_task_setup task_setup_data = {
8325                 .task = &data->task,
8326                 .rpc_client = NFS_CLIENT(data->args.inode),
8327                 .rpc_message = &msg,
8328                 .callback_ops = &nfs4_layoutcommit_ops,
8329                 .callback_data = data,
8330         };
8331         struct rpc_task *task;
8332         int status = 0;
8333
8334         dprintk("NFS: initiating layoutcommit call. sync %d "
8335                 "lbw: %llu inode %lu\n", sync,
8336                 data->args.lastbytewritten,
8337                 data->args.inode->i_ino);
8338
8339         if (!sync) {
8340                 data->inode = nfs_igrab_and_active(data->args.inode);
8341                 if (data->inode == NULL) {
8342                         nfs4_layoutcommit_release(data);
8343                         return -EAGAIN;
8344                 }
8345                 task_setup_data.flags = RPC_TASK_ASYNC;
8346         }
8347         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1);
8348         task = rpc_run_task(&task_setup_data);
8349         if (IS_ERR(task))
8350                 return PTR_ERR(task);
8351         if (sync)
8352                 status = task->tk_status;
8353         trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
8354         dprintk("%s: status %d\n", __func__, status);
8355         rpc_put_task(task);
8356         return status;
8357 }
8358
8359 /**
8360  * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
8361  * possible) as per RFC3530bis and RFC5661 Security Considerations sections
8362  */
8363 static int
8364 _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8365                     struct nfs_fsinfo *info,
8366                     struct nfs4_secinfo_flavors *flavors, bool use_integrity)
8367 {
8368         struct nfs41_secinfo_no_name_args args = {
8369                 .style = SECINFO_STYLE_CURRENT_FH,
8370         };
8371         struct nfs4_secinfo_res res = {
8372                 .flavors = flavors,
8373         };
8374         struct rpc_message msg = {
8375                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
8376                 .rpc_argp = &args,
8377                 .rpc_resp = &res,
8378         };
8379         struct rpc_clnt *clnt = server->client;
8380         struct rpc_cred *cred = NULL;
8381         int status;
8382
8383         if (use_integrity) {
8384                 clnt = server->nfs_client->cl_rpcclient;
8385                 cred = nfs4_get_clid_cred(server->nfs_client);
8386                 msg.rpc_cred = cred;
8387         }
8388
8389         dprintk("--> %s\n", __func__);
8390         status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
8391                                 &res.seq_res, 0);
8392         dprintk("<-- %s status=%d\n", __func__, status);
8393
8394         if (cred)
8395                 put_rpccred(cred);
8396
8397         return status;
8398 }
8399
8400 static int
8401 nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
8402                            struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
8403 {
8404         struct nfs4_exception exception = { };
8405         int err;
8406         do {
8407                 /* first try using integrity protection */
8408                 err = -NFS4ERR_WRONGSEC;
8409
8410                 /* try to use integrity protection with machine cred */
8411                 if (_nfs4_is_integrity_protected(server->nfs_client))
8412                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8413                                                           flavors, true);
8414
8415                 /*
8416                  * if unable to use integrity protection, or SECINFO with
8417                  * integrity protection returns NFS4ERR_WRONGSEC (which is
8418                  * disallowed by spec, but exists in deployed servers) use
8419                  * the current filesystem's rpc_client and the user cred.
8420                  */
8421                 if (err == -NFS4ERR_WRONGSEC)
8422                         err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
8423                                                           flavors, false);
8424
8425                 switch (err) {
8426                 case 0:
8427                 case -NFS4ERR_WRONGSEC:
8428                 case -ENOTSUPP:
8429                         goto out;
8430                 default:
8431                         err = nfs4_handle_exception(server, err, &exception);
8432                 }
8433         } while (exception.retry);
8434 out:
8435         return err;
8436 }
8437
8438 static int
8439 nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
8440                     struct nfs_fsinfo *info)
8441 {
8442         int err;
8443         struct page *page;
8444         rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
8445         struct nfs4_secinfo_flavors *flavors;
8446         struct nfs4_secinfo4 *secinfo;
8447         int i;
8448
8449         page = alloc_page(GFP_KERNEL);
8450         if (!page) {
8451                 err = -ENOMEM;
8452                 goto out;
8453         }
8454
8455         flavors = page_address(page);
8456         err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
8457
8458         /*
8459          * Fall back on "guess and check" method if
8460          * the server doesn't support SECINFO_NO_NAME
8461          */
8462         if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
8463                 err = nfs4_find_root_sec(server, fhandle, info);
8464                 goto out_freepage;
8465         }
8466         if (err)
8467                 goto out_freepage;
8468
8469         for (i = 0; i < flavors->num_flavors; i++) {
8470                 secinfo = &flavors->flavors[i];
8471
8472                 switch (secinfo->flavor) {
8473                 case RPC_AUTH_NULL:
8474                 case RPC_AUTH_UNIX:
8475                 case RPC_AUTH_GSS:
8476                         flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
8477                                         &secinfo->flavor_info);
8478                         break;
8479                 default:
8480                         flavor = RPC_AUTH_MAXFLAVOR;
8481                         break;
8482                 }
8483
8484                 if (!nfs_auth_info_match(&server->auth_info, flavor))
8485                         flavor = RPC_AUTH_MAXFLAVOR;
8486
8487                 if (flavor != RPC_AUTH_MAXFLAVOR) {
8488                         err = nfs4_lookup_root_sec(server, fhandle,
8489                                                    info, flavor);
8490                         if (!err)
8491                                 break;
8492                 }
8493         }
8494
8495         if (flavor == RPC_AUTH_MAXFLAVOR)
8496                 err = -EPERM;
8497
8498 out_freepage:
8499         put_page(page);
8500         if (err == -EACCES)
8501                 return -EPERM;
8502 out:
8503         return err;
8504 }
8505
8506 static int _nfs41_test_stateid(struct nfs_server *server,
8507                 nfs4_stateid *stateid,
8508                 struct rpc_cred *cred)
8509 {
8510         int status;
8511         struct nfs41_test_stateid_args args = {
8512                 .stateid = stateid,
8513         };
8514         struct nfs41_test_stateid_res res;
8515         struct rpc_message msg = {
8516                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
8517                 .rpc_argp = &args,
8518                 .rpc_resp = &res,
8519                 .rpc_cred = cred,
8520         };
8521         struct rpc_clnt *rpc_client = server->client;
8522
8523         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8524                 &rpc_client, &msg);
8525
8526         dprintk("NFS call  test_stateid %p\n", stateid);
8527         nfs4_init_sequence(&args.seq_args, &res.seq_res, 0);
8528         nfs4_set_sequence_privileged(&args.seq_args);
8529         status = nfs4_call_sync_sequence(rpc_client, server, &msg,
8530                         &args.seq_args, &res.seq_res);
8531         if (status != NFS_OK) {
8532                 dprintk("NFS reply test_stateid: failed, %d\n", status);
8533                 return status;
8534         }
8535         dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
8536         return -res.status;
8537 }
8538
8539 /**
8540  * nfs41_test_stateid - perform a TEST_STATEID operation
8541  *
8542  * @server: server / transport on which to perform the operation
8543  * @stateid: state ID to test
8544  * @cred: credential
8545  *
8546  * Returns NFS_OK if the server recognizes that "stateid" is valid.
8547  * Otherwise a negative NFS4ERR value is returned if the operation
8548  * failed or the state ID is not currently valid.
8549  */
8550 static int nfs41_test_stateid(struct nfs_server *server,
8551                 nfs4_stateid *stateid,
8552                 struct rpc_cred *cred)
8553 {
8554         struct nfs4_exception exception = { };
8555         int err;
8556         do {
8557                 err = _nfs41_test_stateid(server, stateid, cred);
8558                 if (err != -NFS4ERR_DELAY)
8559                         break;
8560                 nfs4_handle_exception(server, err, &exception);
8561         } while (exception.retry);
8562         return err;
8563 }
8564
8565 struct nfs_free_stateid_data {
8566         struct nfs_server *server;
8567         struct nfs41_free_stateid_args args;
8568         struct nfs41_free_stateid_res res;
8569 };
8570
8571 static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
8572 {
8573         struct nfs_free_stateid_data *data = calldata;
8574         nfs41_setup_sequence(nfs4_get_session(data->server),
8575                         &data->args.seq_args,
8576                         &data->res.seq_res,
8577                         task);
8578 }
8579
8580 static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
8581 {
8582         struct nfs_free_stateid_data *data = calldata;
8583
8584         nfs41_sequence_done(task, &data->res.seq_res);
8585
8586         switch (task->tk_status) {
8587         case -NFS4ERR_DELAY:
8588                 if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
8589                         rpc_restart_call_prepare(task);
8590         }
8591 }
8592
8593 static void nfs41_free_stateid_release(void *calldata)
8594 {
8595         kfree(calldata);
8596 }
8597
8598 static const struct rpc_call_ops nfs41_free_stateid_ops = {
8599         .rpc_call_prepare = nfs41_free_stateid_prepare,
8600         .rpc_call_done = nfs41_free_stateid_done,
8601         .rpc_release = nfs41_free_stateid_release,
8602 };
8603
8604 static struct rpc_task *_nfs41_free_stateid(struct nfs_server *server,
8605                 nfs4_stateid *stateid,
8606                 struct rpc_cred *cred,
8607                 bool privileged)
8608 {
8609         struct rpc_message msg = {
8610                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
8611                 .rpc_cred = cred,
8612         };
8613         struct rpc_task_setup task_setup = {
8614                 .rpc_client = server->client,
8615                 .rpc_message = &msg,
8616                 .callback_ops = &nfs41_free_stateid_ops,
8617                 .flags = RPC_TASK_ASYNC,
8618         };
8619         struct nfs_free_stateid_data *data;
8620
8621         nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
8622                 &task_setup.rpc_client, &msg);
8623
8624         dprintk("NFS call  free_stateid %p\n", stateid);
8625         data = kmalloc(sizeof(*data), GFP_NOFS);
8626         if (!data)
8627                 return ERR_PTR(-ENOMEM);
8628         data->server = server;
8629         nfs4_stateid_copy(&data->args.stateid, stateid);
8630
8631         task_setup.callback_data = data;
8632
8633         msg.rpc_argp = &data->args;
8634         msg.rpc_resp = &data->res;
8635         nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0);
8636         if (privileged)
8637                 nfs4_set_sequence_privileged(&data->args.seq_args);
8638
8639         return rpc_run_task(&task_setup);
8640 }
8641
8642 /**
8643  * nfs41_free_stateid - perform a FREE_STATEID operation
8644  *
8645  * @server: server / transport on which to perform the operation
8646  * @stateid: state ID to release
8647  * @cred: credential
8648  *
8649  * Returns NFS_OK if the server freed "stateid".  Otherwise a
8650  * negative NFS4ERR value is returned.
8651  */
8652 static int nfs41_free_stateid(struct nfs_server *server,
8653                 nfs4_stateid *stateid,
8654                 struct rpc_cred *cred)
8655 {
8656         struct rpc_task *task;
8657         int ret;
8658
8659         task = _nfs41_free_stateid(server, stateid, cred, true);
8660         if (IS_ERR(task))
8661                 return PTR_ERR(task);
8662         ret = rpc_wait_for_completion_task(task);
8663         if (!ret)
8664                 ret = task->tk_status;
8665         rpc_put_task(task);
8666         return ret;
8667 }
8668
8669 static void
8670 nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
8671 {
8672         struct rpc_task *task;
8673         struct rpc_cred *cred = lsp->ls_state->owner->so_cred;
8674
8675         task = _nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
8676         nfs4_free_lock_state(server, lsp);
8677         if (IS_ERR(task))
8678                 return;
8679         rpc_put_task(task);
8680 }
8681
8682 static bool nfs41_match_stateid(const nfs4_stateid *s1,
8683                 const nfs4_stateid *s2)
8684 {
8685         if (s1->type != s2->type)
8686                 return false;
8687
8688         if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
8689                 return false;
8690
8691         if (s1->seqid == s2->seqid)
8692                 return true;
8693         if (s1->seqid == 0 || s2->seqid == 0)
8694                 return true;
8695
8696         return false;
8697 }
8698
8699 #endif /* CONFIG_NFS_V4_1 */
8700
8701 static bool nfs4_match_stateid(const nfs4_stateid *s1,
8702                 const nfs4_stateid *s2)
8703 {
8704         return nfs4_stateid_match(s1, s2);
8705 }
8706
8707
8708 static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
8709         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8710         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8711         .recover_open   = nfs4_open_reclaim,
8712         .recover_lock   = nfs4_lock_reclaim,
8713         .establish_clid = nfs4_init_clientid,
8714         .detect_trunking = nfs40_discover_server_trunking,
8715 };
8716
8717 #if defined(CONFIG_NFS_V4_1)
8718 static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
8719         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
8720         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
8721         .recover_open   = nfs4_open_reclaim,
8722         .recover_lock   = nfs4_lock_reclaim,
8723         .establish_clid = nfs41_init_clientid,
8724         .reclaim_complete = nfs41_proc_reclaim_complete,
8725         .detect_trunking = nfs41_discover_server_trunking,
8726 };
8727 #endif /* CONFIG_NFS_V4_1 */
8728
8729 static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
8730         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8731         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8732         .recover_open   = nfs40_open_expired,
8733         .recover_lock   = nfs4_lock_expired,
8734         .establish_clid = nfs4_init_clientid,
8735 };
8736
8737 #if defined(CONFIG_NFS_V4_1)
8738 static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
8739         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
8740         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
8741         .recover_open   = nfs41_open_expired,
8742         .recover_lock   = nfs41_lock_expired,
8743         .establish_clid = nfs41_init_clientid,
8744 };
8745 #endif /* CONFIG_NFS_V4_1 */
8746
8747 static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
8748         .sched_state_renewal = nfs4_proc_async_renew,
8749         .get_state_renewal_cred_locked = nfs4_get_renew_cred_locked,
8750         .renew_lease = nfs4_proc_renew,
8751 };
8752
8753 #if defined(CONFIG_NFS_V4_1)
8754 static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
8755         .sched_state_renewal = nfs41_proc_async_sequence,
8756         .get_state_renewal_cred_locked = nfs4_get_machine_cred_locked,
8757         .renew_lease = nfs4_proc_sequence,
8758 };
8759 #endif
8760
8761 static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
8762         .get_locations = _nfs40_proc_get_locations,
8763         .fsid_present = _nfs40_proc_fsid_present,
8764 };
8765
8766 #if defined(CONFIG_NFS_V4_1)
8767 static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
8768         .get_locations = _nfs41_proc_get_locations,
8769         .fsid_present = _nfs41_proc_fsid_present,
8770 };
8771 #endif  /* CONFIG_NFS_V4_1 */
8772
8773 static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
8774         .minor_version = 0,
8775         .init_caps = NFS_CAP_READDIRPLUS
8776                 | NFS_CAP_ATOMIC_OPEN
8777                 | NFS_CAP_POSIX_LOCK,
8778         .init_client = nfs40_init_client,
8779         .shutdown_client = nfs40_shutdown_client,
8780         .match_stateid = nfs4_match_stateid,
8781         .find_root_sec = nfs4_find_root_sec,
8782         .free_lock_state = nfs4_release_lockowner,
8783         .alloc_seqid = nfs_alloc_seqid,
8784         .call_sync_ops = &nfs40_call_sync_ops,
8785         .reboot_recovery_ops = &nfs40_reboot_recovery_ops,
8786         .nograce_recovery_ops = &nfs40_nograce_recovery_ops,
8787         .state_renewal_ops = &nfs40_state_renewal_ops,
8788         .mig_recovery_ops = &nfs40_mig_recovery_ops,
8789 };
8790
8791 #if defined(CONFIG_NFS_V4_1)
8792 static struct nfs_seqid *
8793 nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
8794 {
8795         return NULL;
8796 }
8797
8798 static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
8799         .minor_version = 1,
8800         .init_caps = NFS_CAP_READDIRPLUS
8801                 | NFS_CAP_ATOMIC_OPEN
8802                 | NFS_CAP_POSIX_LOCK
8803                 | NFS_CAP_STATEID_NFSV41
8804                 | NFS_CAP_ATOMIC_OPEN_V1,
8805         .init_client = nfs41_init_client,
8806         .shutdown_client = nfs41_shutdown_client,
8807         .match_stateid = nfs41_match_stateid,
8808         .find_root_sec = nfs41_find_root_sec,
8809         .free_lock_state = nfs41_free_lock_state,
8810         .alloc_seqid = nfs_alloc_no_seqid,
8811         .call_sync_ops = &nfs41_call_sync_ops,
8812         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8813         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8814         .state_renewal_ops = &nfs41_state_renewal_ops,
8815         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8816 };
8817 #endif
8818
8819 #if defined(CONFIG_NFS_V4_2)
8820 static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
8821         .minor_version = 2,
8822         .init_caps = NFS_CAP_READDIRPLUS
8823                 | NFS_CAP_ATOMIC_OPEN
8824                 | NFS_CAP_POSIX_LOCK
8825                 | NFS_CAP_STATEID_NFSV41
8826                 | NFS_CAP_ATOMIC_OPEN_V1
8827                 | NFS_CAP_ALLOCATE
8828                 | NFS_CAP_COPY
8829                 | NFS_CAP_DEALLOCATE
8830                 | NFS_CAP_SEEK
8831                 | NFS_CAP_LAYOUTSTATS
8832                 | NFS_CAP_CLONE,
8833         .init_client = nfs41_init_client,
8834         .shutdown_client = nfs41_shutdown_client,
8835         .match_stateid = nfs41_match_stateid,
8836         .find_root_sec = nfs41_find_root_sec,
8837         .free_lock_state = nfs41_free_lock_state,
8838         .call_sync_ops = &nfs41_call_sync_ops,
8839         .alloc_seqid = nfs_alloc_no_seqid,
8840         .reboot_recovery_ops = &nfs41_reboot_recovery_ops,
8841         .nograce_recovery_ops = &nfs41_nograce_recovery_ops,
8842         .state_renewal_ops = &nfs41_state_renewal_ops,
8843         .mig_recovery_ops = &nfs41_mig_recovery_ops,
8844 };
8845 #endif
8846
8847 const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
8848         [0] = &nfs_v4_0_minor_ops,
8849 #if defined(CONFIG_NFS_V4_1)
8850         [1] = &nfs_v4_1_minor_ops,
8851 #endif
8852 #if defined(CONFIG_NFS_V4_2)
8853         [2] = &nfs_v4_2_minor_ops,
8854 #endif
8855 };
8856
8857 ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
8858 {
8859         ssize_t error, error2;
8860
8861         error = generic_listxattr(dentry, list, size);
8862         if (error < 0)
8863                 return error;
8864         if (list) {
8865                 list += error;
8866                 size -= error;
8867         }
8868
8869         error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
8870         if (error2 < 0)
8871                 return error2;
8872         return error + error2;
8873 }
8874
8875 static const struct inode_operations nfs4_dir_inode_operations = {
8876         .create         = nfs_create,
8877         .lookup         = nfs_lookup,
8878         .atomic_open    = nfs_atomic_open,
8879         .link           = nfs_link,
8880         .unlink         = nfs_unlink,
8881         .symlink        = nfs_symlink,
8882         .mkdir          = nfs_mkdir,
8883         .rmdir          = nfs_rmdir,
8884         .mknod          = nfs_mknod,
8885         .rename         = nfs_rename,
8886         .permission     = nfs_permission,
8887         .getattr        = nfs_getattr,
8888         .setattr        = nfs_setattr,
8889         .getxattr       = generic_getxattr,
8890         .setxattr       = generic_setxattr,
8891         .listxattr      = nfs4_listxattr,
8892         .removexattr    = generic_removexattr,
8893 };
8894
8895 static const struct inode_operations nfs4_file_inode_operations = {
8896         .permission     = nfs_permission,
8897         .getattr        = nfs_getattr,
8898         .setattr        = nfs_setattr,
8899         .getxattr       = generic_getxattr,
8900         .setxattr       = generic_setxattr,
8901         .listxattr      = nfs4_listxattr,
8902         .removexattr    = generic_removexattr,
8903 };
8904
8905 const struct nfs_rpc_ops nfs_v4_clientops = {
8906         .version        = 4,                    /* protocol version */
8907         .dentry_ops     = &nfs4_dentry_operations,
8908         .dir_inode_ops  = &nfs4_dir_inode_operations,
8909         .file_inode_ops = &nfs4_file_inode_operations,
8910         .file_ops       = &nfs4_file_operations,
8911         .getroot        = nfs4_proc_get_root,
8912         .submount       = nfs4_submount,
8913         .try_mount      = nfs4_try_mount,
8914         .getattr        = nfs4_proc_getattr,
8915         .setattr        = nfs4_proc_setattr,
8916         .lookup         = nfs4_proc_lookup,
8917         .access         = nfs4_proc_access,
8918         .readlink       = nfs4_proc_readlink,
8919         .create         = nfs4_proc_create,
8920         .remove         = nfs4_proc_remove,
8921         .unlink_setup   = nfs4_proc_unlink_setup,
8922         .unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
8923         .unlink_done    = nfs4_proc_unlink_done,
8924         .rename_setup   = nfs4_proc_rename_setup,
8925         .rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
8926         .rename_done    = nfs4_proc_rename_done,
8927         .link           = nfs4_proc_link,
8928         .symlink        = nfs4_proc_symlink,
8929         .mkdir          = nfs4_proc_mkdir,
8930         .rmdir          = nfs4_proc_remove,
8931         .readdir        = nfs4_proc_readdir,
8932         .mknod          = nfs4_proc_mknod,
8933         .statfs         = nfs4_proc_statfs,
8934         .fsinfo         = nfs4_proc_fsinfo,
8935         .pathconf       = nfs4_proc_pathconf,
8936         .set_capabilities = nfs4_server_capabilities,
8937         .decode_dirent  = nfs4_decode_dirent,
8938         .pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
8939         .read_setup     = nfs4_proc_read_setup,
8940         .read_done      = nfs4_read_done,
8941         .write_setup    = nfs4_proc_write_setup,
8942         .write_done     = nfs4_write_done,
8943         .commit_setup   = nfs4_proc_commit_setup,
8944         .commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
8945         .commit_done    = nfs4_commit_done,
8946         .lock           = nfs4_proc_lock,
8947         .clear_acl_cache = nfs4_zap_acl_attr,
8948         .close_context  = nfs4_close_context,
8949         .open_context   = nfs4_atomic_open,
8950         .have_delegation = nfs4_have_delegation,
8951         .return_delegation = nfs4_inode_return_delegation,
8952         .alloc_client   = nfs4_alloc_client,
8953         .init_client    = nfs4_init_client,
8954         .free_client    = nfs4_free_client,
8955         .create_server  = nfs4_create_server,
8956         .clone_server   = nfs_clone_server,
8957 };
8958
8959 static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
8960         .name   = XATTR_NAME_NFSV4_ACL,
8961         .list   = nfs4_xattr_list_nfs4_acl,
8962         .get    = nfs4_xattr_get_nfs4_acl,
8963         .set    = nfs4_xattr_set_nfs4_acl,
8964 };
8965
8966 const struct xattr_handler *nfs4_xattr_handlers[] = {
8967         &nfs4_xattr_nfs4_acl_handler,
8968 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
8969         &nfs4_xattr_nfs4_label_handler,
8970 #endif
8971         NULL
8972 };
8973
8974 /*
8975  * Local variables:
8976  *  c-basic-offset: 8
8977  * End:
8978  */