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/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "internal.h"
  55 #include "iostat.h"
  56
  57 #define NFSDBG_FACILITY         NFSDBG_PROC
  58
  59 #define NFS4_POLL_RETRY_MIN     (HZ/10)
  60 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  61
  62 struct nfs4_opendata;
  63 static int _nfs4_proc_open(struct nfs4_opendata *data);
  64 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  65 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
  66 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  67 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  68
  69 /* Prevent leaks of NFSv4 errors into userland */
  70 static int nfs4_map_errors(int err)
  71 {
  72         if (err < -1000) {
  73                 dprintk("%s could not handle NFSv4 error %d\n",
  74                                 __func__, -err);
  75                 return -EIO;
  76         }
  77         return err;
  78 }
  79
  80 /*
  81  * This is our standard bitmap for GETATTR requests.
  82  */
  83 const u32 nfs4_fattr_bitmap[2] = {
  84         FATTR4_WORD0_TYPE
  85         | FATTR4_WORD0_CHANGE
  86         | FATTR4_WORD0_SIZE
  87         | FATTR4_WORD0_FSID
  88         | FATTR4_WORD0_FILEID,
  89         FATTR4_WORD1_MODE
  90         | FATTR4_WORD1_NUMLINKS
  91         | FATTR4_WORD1_OWNER
  92         | FATTR4_WORD1_OWNER_GROUP
  93         | FATTR4_WORD1_RAWDEV
  94         | FATTR4_WORD1_SPACE_USED
  95         | FATTR4_WORD1_TIME_ACCESS
  96         | FATTR4_WORD1_TIME_METADATA
  97         | FATTR4_WORD1_TIME_MODIFY
  98 };
  99
 100 const u32 nfs4_statfs_bitmap[2] = {
 101         FATTR4_WORD0_FILES_AVAIL
 102         | FATTR4_WORD0_FILES_FREE
 103         | FATTR4_WORD0_FILES_TOTAL,
 104         FATTR4_WORD1_SPACE_AVAIL
 105         | FATTR4_WORD1_SPACE_FREE
 106         | FATTR4_WORD1_SPACE_TOTAL
 107 };
 108
 109 const u32 nfs4_pathconf_bitmap[2] = {
 110         FATTR4_WORD0_MAXLINK
 111         | FATTR4_WORD0_MAXNAME,
 112         0
 113 };
 114
 115 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 116                         | FATTR4_WORD0_MAXREAD
 117                         | FATTR4_WORD0_MAXWRITE
 118                         | FATTR4_WORD0_LEASE_TIME,
 119                         0
 120 };
 121
 122 const u32 nfs4_fs_locations_bitmap[2] = {
 123         FATTR4_WORD0_TYPE
 124         | FATTR4_WORD0_CHANGE
 125         | FATTR4_WORD0_SIZE
 126         | FATTR4_WORD0_FSID
 127         | FATTR4_WORD0_FILEID
 128         | FATTR4_WORD0_FS_LOCATIONS,
 129         FATTR4_WORD1_MODE
 130         | FATTR4_WORD1_NUMLINKS
 131         | FATTR4_WORD1_OWNER
 132         | FATTR4_WORD1_OWNER_GROUP
 133         | FATTR4_WORD1_RAWDEV
 134         | FATTR4_WORD1_SPACE_USED
 135         | FATTR4_WORD1_TIME_ACCESS
 136         | FATTR4_WORD1_TIME_METADATA
 137         | FATTR4_WORD1_TIME_MODIFY
 138         | FATTR4_WORD1_MOUNTED_ON_FILEID
 139 };
 140
 141 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 142                 struct nfs4_readdir_arg *readdir)
 143 {
 144         __be32 *start, *p;
 145
 146         BUG_ON(readdir->count < 80);
 147         if (cookie > 2) {
 148                 readdir->cookie = cookie;
 149                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 150                 return;
 151         }
 152
 153         readdir->cookie = 0;
 154         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 155         if (cookie == 2)
 156                 return;
 157
 158         /*
 159          * NFSv4 servers do not return entries for '.' and '..'
 160          * Therefore, we fake these entries here.  We let '.'
 161          * have cookie 0 and '..' have cookie 1.  Note that
 162          * when talking to the server, we always send cookie 0
 163          * instead of 1 or 2.
 164          */
 165         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 166
 167         if (cookie == 0) {
 168                 *p++ = xdr_one;                                  /* next */
 169                 *p++ = xdr_zero;                   /* cookie, first word */
 170                 *p++ = xdr_one;                   /* cookie, second word */
 171                 *p++ = xdr_one;                             /* entry len */
 172                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 173                 p++;
 174                 *p++ = xdr_one;                         /* bitmap length */
 175                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 176                 *p++ = htonl(8);              /* attribute buffer length */
 177                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 178         }
 179
 180         *p++ = xdr_one;                                  /* next */
 181         *p++ = xdr_zero;                   /* cookie, first word */
 182         *p++ = xdr_two;                   /* cookie, second word */
 183         *p++ = xdr_two;                             /* entry len */
 184         memcpy(p, "..\0\0", 4);                         /* entry */
 185         p++;
 186         *p++ = xdr_one;                         /* bitmap length */
 187         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 188         *p++ = htonl(8);              /* attribute buffer length */
 189         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 190
 191         readdir->pgbase = (char *)p - (char *)start;
 192         readdir->count -= readdir->pgbase;
 193         kunmap_atomic(start, KM_USER0);
 194 }
 195
 196 static int nfs4_wait_bit_killable(void *word)
 197 {
 198         if (fatal_signal_pending(current))
 199                 return -ERESTARTSYS;
 200         schedule();
 201         return 0;
 202 }
 203
 204 static int nfs4_wait_clnt_recover(struct nfs_client *clp)
 205 {
 206         int res;
 207
 208         might_sleep();
 209
 210         res = wait_on_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
 211                         nfs4_wait_bit_killable, TASK_KILLABLE);
 212         return res;
 213 }
 214
 215 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
 216 {
 217         int res = 0;
 218
 219         might_sleep();
 220
 221         if (*timeout <= 0)
 222                 *timeout = NFS4_POLL_RETRY_MIN;
 223         if (*timeout > NFS4_POLL_RETRY_MAX)
 224                 *timeout = NFS4_POLL_RETRY_MAX;
 225         schedule_timeout_killable(*timeout);
 226         if (fatal_signal_pending(current))
 227                 res = -ERESTARTSYS;
 228         *timeout <<= 1;
 229         return res;
 230 }
 231
 232 /* This is the error handling routine for processes that are allowed
 233  * to sleep.
 234  */
 235 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
 236 {
 237         struct nfs_client *clp = server->nfs_client;
 238         struct nfs4_state *state = exception->state;
 239         int ret = errorcode;
 240
 241         exception->retry = 0;
 242         switch(errorcode) {
 243                 case 0:
 244                         return 0;
 245                 case -NFS4ERR_ADMIN_REVOKED:
 246                 case -NFS4ERR_BAD_STATEID:
 247                 case -NFS4ERR_OPENMODE:
 248                         if (state == NULL)
 249                                 break;
 250                         nfs4_state_mark_reclaim_nograce(clp, state);
 251                 case -NFS4ERR_STALE_CLIENTID:
 252                 case -NFS4ERR_STALE_STATEID:
 253                 case -NFS4ERR_EXPIRED:
 254                         nfs4_schedule_state_recovery(clp);
 255                         ret = nfs4_wait_clnt_recover(clp);
 256                         if (ret == 0)
 257                                 exception->retry = 1;
 258                         break;
 259                 case -NFS4ERR_FILE_OPEN:
 260                 case -NFS4ERR_GRACE:
 261                 case -NFS4ERR_DELAY:
 262                         ret = nfs4_delay(server->client, &exception->timeout);
 263                         if (ret != 0)
 264                                 break;
 265                 case -NFS4ERR_OLD_STATEID:
 266                         exception->retry = 1;
 267         }
 268         /* We failed to handle the error */
 269         return nfs4_map_errors(ret);
 270 }
 271
 272
 273 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 274 {
 275         struct nfs_client *clp = server->nfs_client;
 276         spin_lock(&clp->cl_lock);
 277         if (time_before(clp->cl_last_renewal,timestamp))
 278                 clp->cl_last_renewal = timestamp;
 279         spin_unlock(&clp->cl_lock);
 280 }
 281
 282 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 283 {
 284         struct nfs_inode *nfsi = NFS_I(dir);
 285
 286         spin_lock(&dir->i_lock);
 287         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 288         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 289                 nfs_force_lookup_revalidate(dir);
 290         nfsi->change_attr = cinfo->after;
 291         spin_unlock(&dir->i_lock);
 292 }
 293
 294 struct nfs4_opendata {
 295         struct kref kref;
 296         struct nfs_openargs o_arg;
 297         struct nfs_openres o_res;
 298         struct nfs_open_confirmargs c_arg;
 299         struct nfs_open_confirmres c_res;
 300         struct nfs_fattr f_attr;
 301         struct nfs_fattr dir_attr;
 302         struct path path;
 303         struct dentry *dir;
 304         struct nfs4_state_owner *owner;
 305         struct nfs4_state *state;
 306         struct iattr attrs;
 307         unsigned long timestamp;
 308         unsigned int rpc_done : 1;
 309         int rpc_status;
 310         int cancelled;
 311 };
 312
 313
 314 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 315 {
 316         p->o_res.f_attr = &p->f_attr;
 317         p->o_res.dir_attr = &p->dir_attr;
 318         p->o_res.seqid = p->o_arg.seqid;
 319         p->c_res.seqid = p->c_arg.seqid;
 320         p->o_res.server = p->o_arg.server;
 321         nfs_fattr_init(&p->f_attr);
 322         nfs_fattr_init(&p->dir_attr);
 323 }
 324
 325 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 326                 struct nfs4_state_owner *sp, fmode_t fmode, int flags,
 327                 const struct iattr *attrs)
 328 {
 329         struct dentry *parent = dget_parent(path->dentry);
 330         struct inode *dir = parent->d_inode;
 331         struct nfs_server *server = NFS_SERVER(dir);
 332         struct nfs4_opendata *p;
 333
 334         p = kzalloc(sizeof(*p), GFP_KERNEL);
 335         if (p == NULL)
 336                 goto err;
 337         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 338         if (p->o_arg.seqid == NULL)
 339                 goto err_free;
 340         p->path.mnt = mntget(path->mnt);
 341         p->path.dentry = dget(path->dentry);
 342         p->dir = parent;
 343         p->owner = sp;
 344         atomic_inc(&sp->so_count);
 345         p->o_arg.fh = NFS_FH(dir);
 346         p->o_arg.open_flags = flags;
 347         p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
 348         p->o_arg.clientid = server->nfs_client->cl_clientid;
 349         p->o_arg.id = sp->so_owner_id.id;
 350         p->o_arg.name = &p->path.dentry->d_name;
 351         p->o_arg.server = server;
 352         p->o_arg.bitmask = server->attr_bitmask;
 353         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 354         if (flags & O_EXCL) {
 355                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 356                 s[0] = jiffies;
 357                 s[1] = current->pid;
 358         } else if (flags & O_CREAT) {
 359                 p->o_arg.u.attrs = &p->attrs;
 360                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 361         }
 362         p->c_arg.fh = &p->o_res.fh;
 363         p->c_arg.stateid = &p->o_res.stateid;
 364         p->c_arg.seqid = p->o_arg.seqid;
 365         nfs4_init_opendata_res(p);
 366         kref_init(&p->kref);
 367         return p;
 368 err_free:
 369         kfree(p);
 370 err:
 371         dput(parent);
 372         return NULL;
 373 }
 374
 375 static void nfs4_opendata_free(struct kref *kref)
 376 {
 377         struct nfs4_opendata *p = container_of(kref,
 378                         struct nfs4_opendata, kref);
 379
 380         nfs_free_seqid(p->o_arg.seqid);
 381         if (p->state != NULL)
 382                 nfs4_put_open_state(p->state);
 383         nfs4_put_state_owner(p->owner);
 384         dput(p->dir);
 385         path_put(&p->path);
 386         kfree(p);
 387 }
 388
 389 static void nfs4_opendata_put(struct nfs4_opendata *p)
 390 {
 391         if (p != NULL)
 392                 kref_put(&p->kref, nfs4_opendata_free);
 393 }
 394
 395 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 396 {
 397         int ret;
 398
 399         ret = rpc_wait_for_completion_task(task);
 400         return ret;
 401 }
 402
 403 static int can_open_cached(struct nfs4_state *state, fmode_t mode, int open_mode)
 404 {
 405         int ret = 0;
 406
 407         if (open_mode & O_EXCL)
 408                 goto out;
 409         switch (mode & (FMODE_READ|FMODE_WRITE)) {
 410                 case FMODE_READ:
 411                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 412                         break;
 413                 case FMODE_WRITE:
 414                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 415                         break;
 416                 case FMODE_READ|FMODE_WRITE:
 417                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 418         }
 419 out:
 420         return ret;
 421 }
 422
 423 static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode)
 424 {
 425         if ((delegation->type & fmode) != fmode)
 426                 return 0;
 427         if (test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
 428                 return 0;
 429         nfs_mark_delegation_referenced(delegation);
 430         return 1;
 431 }
 432
 433 static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
 434 {
 435         switch (fmode) {
 436                 case FMODE_WRITE:
 437                         state->n_wronly++;
 438                         break;
 439                 case FMODE_READ:
 440                         state->n_rdonly++;
 441                         break;
 442                 case FMODE_READ|FMODE_WRITE:
 443                         state->n_rdwr++;
 444         }
 445         nfs4_state_set_mode_locked(state, state->state | fmode);
 446 }
 447
 448 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 449 {
 450         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 451                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 452         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 453         switch (fmode) {
 454                 case FMODE_READ:
 455                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 456                         break;
 457                 case FMODE_WRITE:
 458                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 459                         break;
 460                 case FMODE_READ|FMODE_WRITE:
 461                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 462         }
 463 }
 464
 465 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, fmode_t fmode)
 466 {
 467         write_seqlock(&state->seqlock);
 468         nfs_set_open_stateid_locked(state, stateid, fmode);
 469         write_sequnlock(&state->seqlock);
 470 }
 471
 472 static void __update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, const nfs4_stateid *deleg_stateid, fmode_t fmode)
 473 {
 474         /*
 475          * Protect the call to nfs4_state_set_mode_locked and
 476          * serialise the stateid update
 477          */
 478         write_seqlock(&state->seqlock);
 479         if (deleg_stateid != NULL) {
 480                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 481                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 482         }
 483         if (open_stateid != NULL)
 484                 nfs_set_open_stateid_locked(state, open_stateid, fmode);
 485         write_sequnlock(&state->seqlock);
 486         spin_lock(&state->owner->so_lock);
 487         update_open_stateflags(state, fmode);
 488         spin_unlock(&state->owner->so_lock);
 489 }
 490
 491 static int update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *delegation, fmode_t fmode)
 492 {
 493         struct nfs_inode *nfsi = NFS_I(state->inode);
 494         struct nfs_delegation *deleg_cur;
 495         int ret = 0;
 496
 497         fmode &= (FMODE_READ|FMODE_WRITE);
 498
 499         rcu_read_lock();
 500         deleg_cur = rcu_dereference(nfsi->delegation);
 501         if (deleg_cur == NULL)
 502                 goto no_delegation;
 503
 504         spin_lock(&deleg_cur->lock);
 505         if (nfsi->delegation != deleg_cur ||
 506             (deleg_cur->type & fmode) != fmode)
 507                 goto no_delegation_unlock;
 508
 509         if (delegation == NULL)
 510                 delegation = &deleg_cur->stateid;
 511         else if (memcmp(deleg_cur->stateid.data, delegation->data, NFS4_STATEID_SIZE) != 0)
 512                 goto no_delegation_unlock;
 513
 514         nfs_mark_delegation_referenced(deleg_cur);
 515         __update_open_stateid(state, open_stateid, &deleg_cur->stateid, fmode);
 516         ret = 1;
 517 no_delegation_unlock:
 518         spin_unlock(&deleg_cur->lock);
 519 no_delegation:
 520         rcu_read_unlock();
 521
 522         if (!ret && open_stateid != NULL) {
 523                 __update_open_stateid(state, open_stateid, NULL, fmode);
 524                 ret = 1;
 525         }
 526
 527         return ret;
 528 }
 529
 530
 531 static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
 532 {
 533         struct nfs_delegation *delegation;
 534
 535         rcu_read_lock();
 536         delegation = rcu_dereference(NFS_I(inode)->delegation);
 537         if (delegation == NULL || (delegation->type & fmode) == fmode) {
 538                 rcu_read_unlock();
 539                 return;
 540         }
 541         rcu_read_unlock();
 542         nfs_inode_return_delegation(inode);
 543 }
 544
 545 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 546 {
 547         struct nfs4_state *state = opendata->state;
 548         struct nfs_inode *nfsi = NFS_I(state->inode);
 549         struct nfs_delegation *delegation;
 550         int open_mode = opendata->o_arg.open_flags & O_EXCL;
 551         fmode_t fmode = opendata->o_arg.fmode;
 552         nfs4_stateid stateid;
 553         int ret = -EAGAIN;
 554
 555         for (;;) {
 556                 if (can_open_cached(state, fmode, open_mode)) {
 557                         spin_lock(&state->owner->so_lock);
 558                         if (can_open_cached(state, fmode, open_mode)) {
 559                                 update_open_stateflags(state, fmode);
 560                                 spin_unlock(&state->owner->so_lock);
 561                                 goto out_return_state;
 562                         }
 563                         spin_unlock(&state->owner->so_lock);
 564                 }
 565                 rcu_read_lock();
 566                 delegation = rcu_dereference(nfsi->delegation);
 567                 if (delegation == NULL ||
 568                     !can_open_delegated(delegation, fmode)) {
 569                         rcu_read_unlock();
 570                         break;
 571                 }
 572                 /* Save the delegation */
 573                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 574                 rcu_read_unlock();
 575                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 576                 if (ret != 0)
 577                         goto out;
 578                 ret = -EAGAIN;
 579
 580                 /* Try to update the stateid using the delegation */
 581                 if (update_open_stateid(state, NULL, &stateid, fmode))
 582                         goto out_return_state;
 583         }
 584 out:
 585         return ERR_PTR(ret);
 586 out_return_state:
 587         atomic_inc(&state->count);
 588         return state;
 589 }
 590
 591 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 592 {
 593         struct inode *inode;
 594         struct nfs4_state *state = NULL;
 595         struct nfs_delegation *delegation;
 596         int ret;
 597
 598         if (!data->rpc_done) {
 599                 state = nfs4_try_open_cached(data);
 600                 goto out;
 601         }
 602
 603         ret = -EAGAIN;
 604         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 605                 goto err;
 606         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 607         ret = PTR_ERR(inode);
 608         if (IS_ERR(inode))
 609                 goto err;
 610         ret = -ENOMEM;
 611         state = nfs4_get_open_state(inode, data->owner);
 612         if (state == NULL)
 613                 goto err_put_inode;
 614         if (data->o_res.delegation_type != 0) {
 615                 int delegation_flags = 0;
 616
 617                 rcu_read_lock();
 618                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 619                 if (delegation)
 620                         delegation_flags = delegation->flags;
 621                 rcu_read_unlock();
 622                 if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
 623                         nfs_inode_set_delegation(state->inode,
 624                                         data->owner->so_cred,
 625                                         &data->o_res);
 626                 else
 627                         nfs_inode_reclaim_delegation(state->inode,
 628                                         data->owner->so_cred,
 629                                         &data->o_res);
 630         }
 631
 632         update_open_stateid(state, &data->o_res.stateid, NULL,
 633                         data->o_arg.fmode);
 634         iput(inode);
 635 out:
 636         return state;
 637 err_put_inode:
 638         iput(inode);
 639 err:
 640         return ERR_PTR(ret);
 641 }
 642
 643 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 644 {
 645         struct nfs_inode *nfsi = NFS_I(state->inode);
 646         struct nfs_open_context *ctx;
 647
 648         spin_lock(&state->inode->i_lock);
 649         list_for_each_entry(ctx, &nfsi->open_files, list) {
 650                 if (ctx->state != state)
 651                         continue;
 652                 get_nfs_open_context(ctx);
 653                 spin_unlock(&state->inode->i_lock);
 654                 return ctx;
 655         }
 656         spin_unlock(&state->inode->i_lock);
 657         return ERR_PTR(-ENOENT);
 658 }
 659
 660 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 661 {
 662         struct nfs4_opendata *opendata;
 663
 664         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, 0, NULL);
 665         if (opendata == NULL)
 666                 return ERR_PTR(-ENOMEM);
 667         opendata->state = state;
 668         atomic_inc(&state->count);
 669         return opendata;
 670 }
 671
 672 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, fmode_t fmode, struct nfs4_state **res)
 673 {
 674         struct nfs4_state *newstate;
 675         int ret;
 676
 677         opendata->o_arg.open_flags = 0;
 678         opendata->o_arg.fmode = fmode;
 679         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 680         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 681         nfs4_init_opendata_res(opendata);
 682         ret = _nfs4_proc_open(opendata);
 683         if (ret != 0)
 684                 return ret;
 685         newstate = nfs4_opendata_to_nfs4_state(opendata);
 686         if (IS_ERR(newstate))
 687                 return PTR_ERR(newstate);
 688         nfs4_close_state(&opendata->path, newstate, fmode);
 689         *res = newstate;
 690         return 0;
 691 }
 692
 693 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 694 {
 695         struct nfs4_state *newstate;
 696         int ret;
 697
 698         /* memory barrier prior to reading state->n_* */
 699         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 700         smp_rmb();
 701         if (state->n_rdwr != 0) {
 702                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 703                 if (ret != 0)
 704                         return ret;
 705                 if (newstate != state)
 706                         return -ESTALE;
 707         }
 708         if (state->n_wronly != 0) {
 709                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 710                 if (ret != 0)
 711                         return ret;
 712                 if (newstate != state)
 713                         return -ESTALE;
 714         }
 715         if (state->n_rdonly != 0) {
 716                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 717                 if (ret != 0)
 718                         return ret;
 719                 if (newstate != state)
 720                         return -ESTALE;
 721         }
 722         /*
 723          * We may have performed cached opens for all three recoveries.
 724          * Check if we need to update the current stateid.
 725          */
 726         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 727             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 728                 write_seqlock(&state->seqlock);
 729                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 730                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 731                 write_sequnlock(&state->seqlock);
 732         }
 733         return 0;
 734 }
 735
 736 /*
 737  * OPEN_RECLAIM:
 738  *      reclaim state on the server after a reboot.
 739  */
 740 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 741 {
 742         struct nfs_delegation *delegation;
 743         struct nfs4_opendata *opendata;
 744         fmode_t delegation_type = 0;
 745         int status;
 746
 747         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 748         if (IS_ERR(opendata))
 749                 return PTR_ERR(opendata);
 750         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 751         opendata->o_arg.fh = NFS_FH(state->inode);
 752         rcu_read_lock();
 753         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 754         if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
 755                 delegation_type = delegation->type;
 756         rcu_read_unlock();
 757         opendata->o_arg.u.delegation_type = delegation_type;
 758         status = nfs4_open_recover(opendata, state);
 759         nfs4_opendata_put(opendata);
 760         return status;
 761 }
 762
 763 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 764 {
 765         struct nfs_server *server = NFS_SERVER(state->inode);
 766         struct nfs4_exception exception = { };
 767         int err;
 768         do {
 769                 err = _nfs4_do_open_reclaim(ctx, state);
 770                 if (err != -NFS4ERR_DELAY)
 771                         break;
 772                 nfs4_handle_exception(server, err, &exception);
 773         } while (exception.retry);
 774         return err;
 775 }
 776
 777 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 778 {
 779         struct nfs_open_context *ctx;
 780         int ret;
 781
 782         ctx = nfs4_state_find_open_context(state);
 783         if (IS_ERR(ctx))
 784                 return PTR_ERR(ctx);
 785         ret = nfs4_do_open_reclaim(ctx, state);
 786         put_nfs_open_context(ctx);
 787         return ret;
 788 }
 789
 790 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 791 {
 792         struct nfs4_opendata *opendata;
 793         int ret;
 794
 795         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 796         if (IS_ERR(opendata))
 797                 return PTR_ERR(opendata);
 798         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 799         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 800                         sizeof(opendata->o_arg.u.delegation.data));
 801         ret = nfs4_open_recover(opendata, state);
 802         nfs4_opendata_put(opendata);
 803         return ret;
 804 }
 805
 806 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 807 {
 808         struct nfs4_exception exception = { };
 809         struct nfs_server *server = NFS_SERVER(state->inode);
 810         int err;
 811         do {
 812                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 813                 switch (err) {
 814                         case 0:
 815                                 return err;
 816                         case -NFS4ERR_STALE_CLIENTID:
 817                         case -NFS4ERR_STALE_STATEID:
 818                         case -NFS4ERR_EXPIRED:
 819                                 /* Don't recall a delegation if it was lost */
 820                                 nfs4_schedule_state_recovery(server->nfs_client);
 821                                 return err;
 822                 }
 823                 err = nfs4_handle_exception(server, err, &exception);
 824         } while (exception.retry);
 825         return err;
 826 }
 827
 828 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 829 {
 830         struct nfs4_opendata *data = calldata;
 831
 832         data->rpc_status = task->tk_status;
 833         if (RPC_ASSASSINATED(task))
 834                 return;
 835         if (data->rpc_status == 0) {
 836                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 837                                 sizeof(data->o_res.stateid.data));
 838                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
 839                 renew_lease(data->o_res.server, data->timestamp);
 840                 data->rpc_done = 1;
 841         }
 842 }
 843
 844 static void nfs4_open_confirm_release(void *calldata)
 845 {
 846         struct nfs4_opendata *data = calldata;
 847         struct nfs4_state *state = NULL;
 848
 849         /* If this request hasn't been cancelled, do nothing */
 850         if (data->cancelled == 0)
 851                 goto out_free;
 852         /* In case of error, no cleanup! */
 853         if (!data->rpc_done)
 854                 goto out_free;
 855         state = nfs4_opendata_to_nfs4_state(data);
 856         if (!IS_ERR(state))
 857                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
 858 out_free:
 859         nfs4_opendata_put(data);
 860 }
 861
 862 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 863         .rpc_call_done = nfs4_open_confirm_done,
 864         .rpc_release = nfs4_open_confirm_release,
 865 };
 866
 867 /*
 868  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 869  */
 870 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 871 {
 872         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 873         struct rpc_task *task;
 874         struct  rpc_message msg = {
 875                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 876                 .rpc_argp = &data->c_arg,
 877                 .rpc_resp = &data->c_res,
 878                 .rpc_cred = data->owner->so_cred,
 879         };
 880         struct rpc_task_setup task_setup_data = {
 881                 .rpc_client = server->client,
 882                 .rpc_message = &msg,
 883                 .callback_ops = &nfs4_open_confirm_ops,
 884                 .callback_data = data,
 885                 .workqueue = nfsiod_workqueue,
 886                 .flags = RPC_TASK_ASYNC,
 887         };
 888         int status;
 889
 890         kref_get(&data->kref);
 891         data->rpc_done = 0;
 892         data->rpc_status = 0;
 893         data->timestamp = jiffies;
 894         task = rpc_run_task(&task_setup_data);
 895         if (IS_ERR(task))
 896                 return PTR_ERR(task);
 897         status = nfs4_wait_for_completion_rpc_task(task);
 898         if (status != 0) {
 899                 data->cancelled = 1;
 900                 smp_wmb();
 901         } else
 902                 status = data->rpc_status;
 903         rpc_put_task(task);
 904         return status;
 905 }
 906
 907 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 908 {
 909         struct nfs4_opendata *data = calldata;
 910         struct nfs4_state_owner *sp = data->owner;
 911
 912         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 913                 return;
 914         /*
 915          * Check if we still need to send an OPEN call, or if we can use
 916          * a delegation instead.
 917          */
 918         if (data->state != NULL) {
 919                 struct nfs_delegation *delegation;
 920
 921                 if (can_open_cached(data->state, data->o_arg.fmode, data->o_arg.open_flags))
 922                         goto out_no_action;
 923                 rcu_read_lock();
 924                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 925                 if (delegation != NULL &&
 926                     test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) == 0) {
 927                         rcu_read_unlock();
 928                         goto out_no_action;
 929                 }
 930                 rcu_read_unlock();
 931         }
 932         /* Update sequence id. */
 933         data->o_arg.id = sp->so_owner_id.id;
 934         data->o_arg.clientid = sp->so_client->cl_clientid;
 935         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 936                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 937                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 938         }
 939         data->timestamp = jiffies;
 940         rpc_call_start(task);
 941         return;
 942 out_no_action:
 943         task->tk_action = NULL;
 944
 945 }
 946
 947 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 948 {
 949         struct nfs4_opendata *data = calldata;
 950
 951         data->rpc_status = task->tk_status;
 952         if (RPC_ASSASSINATED(task))
 953                 return;
 954         if (task->tk_status == 0) {
 955                 switch (data->o_res.f_attr->mode & S_IFMT) {
 956                         case S_IFREG:
 957                                 break;
 958                         case S_IFLNK:
 959                                 data->rpc_status = -ELOOP;
 960                                 break;
 961                         case S_IFDIR:
 962                                 data->rpc_status = -EISDIR;
 963                                 break;
 964                         default:
 965                                 data->rpc_status = -ENOTDIR;
 966                 }
 967                 renew_lease(data->o_res.server, data->timestamp);
 968                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 969                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 970         }
 971         data->rpc_done = 1;
 972 }
 973
 974 static void nfs4_open_release(void *calldata)
 975 {
 976         struct nfs4_opendata *data = calldata;
 977         struct nfs4_state *state = NULL;
 978
 979         /* If this request hasn't been cancelled, do nothing */
 980         if (data->cancelled == 0)
 981                 goto out_free;
 982         /* In case of error, no cleanup! */
 983         if (data->rpc_status != 0 || !data->rpc_done)
 984                 goto out_free;
 985         /* In case we need an open_confirm, no cleanup! */
 986         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 987                 goto out_free;
 988         state = nfs4_opendata_to_nfs4_state(data);
 989         if (!IS_ERR(state))
 990                 nfs4_close_state(&data->path, state, data->o_arg.fmode);
 991 out_free:
 992         nfs4_opendata_put(data);
 993 }
 994
 995 static const struct rpc_call_ops nfs4_open_ops = {
 996         .rpc_call_prepare = nfs4_open_prepare,
 997         .rpc_call_done = nfs4_open_done,
 998         .rpc_release = nfs4_open_release,
 999 };
1000
1001 /*
1002  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
1003  */
1004 static int _nfs4_proc_open(struct nfs4_opendata *data)
1005 {
1006         struct inode *dir = data->dir->d_inode;
1007         struct nfs_server *server = NFS_SERVER(dir);
1008         struct nfs_openargs *o_arg = &data->o_arg;
1009         struct nfs_openres *o_res = &data->o_res;
1010         struct rpc_task *task;
1011         struct rpc_message msg = {
1012                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
1013                 .rpc_argp = o_arg,
1014                 .rpc_resp = o_res,
1015                 .rpc_cred = data->owner->so_cred,
1016         };
1017         struct rpc_task_setup task_setup_data = {
1018                 .rpc_client = server->client,
1019                 .rpc_message = &msg,
1020                 .callback_ops = &nfs4_open_ops,
1021                 .callback_data = data,
1022                 .workqueue = nfsiod_workqueue,
1023                 .flags = RPC_TASK_ASYNC,
1024         };
1025         int status;
1026
1027         kref_get(&data->kref);
1028         data->rpc_done = 0;
1029         data->rpc_status = 0;
1030         data->cancelled = 0;
1031         task = rpc_run_task(&task_setup_data);
1032         if (IS_ERR(task))
1033                 return PTR_ERR(task);
1034         status = nfs4_wait_for_completion_rpc_task(task);
1035         if (status != 0) {
1036                 data->cancelled = 1;
1037                 smp_wmb();
1038         } else
1039                 status = data->rpc_status;
1040         rpc_put_task(task);
1041         if (status != 0 || !data->rpc_done)
1042                 return status;
1043
1044         if (o_res->fh.size == 0)
1045                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
1046
1047         if (o_arg->open_flags & O_CREAT) {
1048                 update_changeattr(dir, &o_res->cinfo);
1049                 nfs_post_op_update_inode(dir, o_res->dir_attr);
1050         } else
1051                 nfs_refresh_inode(dir, o_res->dir_attr);
1052         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
1053                 status = _nfs4_proc_open_confirm(data);
1054                 if (status != 0)
1055                         return status;
1056         }
1057         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
1058                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
1059         return 0;
1060 }
1061
1062 static int nfs4_recover_expired_lease(struct nfs_server *server)
1063 {
1064         struct nfs_client *clp = server->nfs_client;
1065         int ret;
1066
1067         for (;;) {
1068                 ret = nfs4_wait_clnt_recover(clp);
1069                 if (ret != 0)
1070                         return ret;
1071                 if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) &&
1072                     !test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state))
1073                         break;
1074                 nfs4_schedule_state_recovery(clp);
1075         }
1076         return 0;
1077 }
1078
1079 /*
1080  * OPEN_EXPIRED:
1081  *      reclaim state on the server after a network partition.
1082  *      Assumes caller holds the appropriate lock
1083  */
1084 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1085 {
1086         struct nfs4_opendata *opendata;
1087         int ret;
1088
1089         opendata = nfs4_open_recoverdata_alloc(ctx, state);
1090         if (IS_ERR(opendata))
1091                 return PTR_ERR(opendata);
1092         ret = nfs4_open_recover(opendata, state);
1093         if (ret == -ESTALE)
1094                 d_drop(ctx->path.dentry);
1095         nfs4_opendata_put(opendata);
1096         return ret;
1097 }
1098
1099 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
1100 {
1101         struct nfs_server *server = NFS_SERVER(state->inode);
1102         struct nfs4_exception exception = { };
1103         int err;
1104
1105         do {
1106                 err = _nfs4_open_expired(ctx, state);
1107                 if (err != -NFS4ERR_DELAY)
1108                         break;
1109                 nfs4_handle_exception(server, err, &exception);
1110         } while (exception.retry);
1111         return err;
1112 }
1113
1114 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1115 {
1116         struct nfs_open_context *ctx;
1117         int ret;
1118
1119         ctx = nfs4_state_find_open_context(state);
1120         if (IS_ERR(ctx))
1121                 return PTR_ERR(ctx);
1122         ret = nfs4_do_open_expired(ctx, state);
1123         put_nfs_open_context(ctx);
1124         return ret;
1125 }
1126
1127 /*
1128  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1129  * fields corresponding to attributes that were used to store the verifier.
1130  * Make sure we clobber those fields in the later setattr call
1131  */
1132 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1133 {
1134         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1135             !(sattr->ia_valid & ATTR_ATIME_SET))
1136                 sattr->ia_valid |= ATTR_ATIME;
1137
1138         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1139             !(sattr->ia_valid & ATTR_MTIME_SET))
1140                 sattr->ia_valid |= ATTR_MTIME;
1141 }
1142
1143 /*
1144  * Returns a referenced nfs4_state
1145  */
1146 static int _nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1147 {
1148         struct nfs4_state_owner  *sp;
1149         struct nfs4_state     *state = NULL;
1150         struct nfs_server       *server = NFS_SERVER(dir);
1151         struct nfs4_opendata *opendata;
1152         int status;
1153
1154         /* Protect against reboot recovery conflicts */
1155         status = -ENOMEM;
1156         if (!(sp = nfs4_get_state_owner(server, cred))) {
1157                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1158                 goto out_err;
1159         }
1160         status = nfs4_recover_expired_lease(server);
1161         if (status != 0)
1162                 goto err_put_state_owner;
1163         if (path->dentry->d_inode != NULL)
1164                 nfs4_return_incompatible_delegation(path->dentry->d_inode, fmode);
1165         status = -ENOMEM;
1166         opendata = nfs4_opendata_alloc(path, sp, fmode, flags, sattr);
1167         if (opendata == NULL)
1168                 goto err_put_state_owner;
1169
1170         if (path->dentry->d_inode != NULL)
1171                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1172
1173         status = _nfs4_proc_open(opendata);
1174         if (status != 0)
1175                 goto err_opendata_put;
1176
1177         if (opendata->o_arg.open_flags & O_EXCL)
1178                 nfs4_exclusive_attrset(opendata, sattr);
1179
1180         state = nfs4_opendata_to_nfs4_state(opendata);
1181         status = PTR_ERR(state);
1182         if (IS_ERR(state))
1183                 goto err_opendata_put;
1184         nfs4_opendata_put(opendata);
1185         nfs4_put_state_owner(sp);
1186         *res = state;
1187         return 0;
1188 err_opendata_put:
1189         nfs4_opendata_put(opendata);
1190 err_put_state_owner:
1191         nfs4_put_state_owner(sp);
1192 out_err:
1193         *res = NULL;
1194         return status;
1195 }
1196
1197
1198 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, fmode_t fmode, int flags, struct iattr *sattr, struct rpc_cred *cred)
1199 {
1200         struct nfs4_exception exception = { };
1201         struct nfs4_state *res;
1202         int status;
1203
1204         do {
1205                 status = _nfs4_do_open(dir, path, fmode, flags, sattr, cred, &res);
1206                 if (status == 0)
1207                         break;
1208                 /* NOTE: BAD_SEQID means the server and client disagree about the
1209                  * book-keeping w.r.t. state-changing operations
1210                  * (OPEN/CLOSE/LOCK/LOCKU...)
1211                  * It is actually a sign of a bug on the client or on the server.
1212                  *
1213                  * If we receive a BAD_SEQID error in the particular case of
1214                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1215                  * have unhashed the old state_owner for us, and that we can
1216                  * therefore safely retry using a new one. We should still warn
1217                  * the user though...
1218                  */
1219                 if (status == -NFS4ERR_BAD_SEQID) {
1220                         printk(KERN_WARNING "NFS: v4 server %s "
1221                                         " returned a bad sequence-id error!\n",
1222                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1223                         exception.retry = 1;
1224                         continue;
1225                 }
1226                 /*
1227                  * BAD_STATEID on OPEN means that the server cancelled our
1228                  * state before it received the OPEN_CONFIRM.
1229                  * Recover by retrying the request as per the discussion
1230                  * on Page 181 of RFC3530.
1231                  */
1232                 if (status == -NFS4ERR_BAD_STATEID) {
1233                         exception.retry = 1;
1234                         continue;
1235                 }
1236                 if (status == -EAGAIN) {
1237                         /* We must have found a delegation */
1238                         exception.retry = 1;
1239                         continue;
1240                 }
1241                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1242                                         status, &exception));
1243         } while (exception.retry);
1244         return res;
1245 }
1246
1247 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1248                             struct nfs_fattr *fattr, struct iattr *sattr,
1249                             struct nfs4_state *state)
1250 {
1251         struct nfs_server *server = NFS_SERVER(inode);
1252         struct nfs_setattrargs  arg = {
1253                 .fh             = NFS_FH(inode),
1254                 .iap            = sattr,
1255                 .server         = server,
1256                 .bitmask = server->attr_bitmask,
1257         };
1258         struct nfs_setattrres  res = {
1259                 .fattr          = fattr,
1260                 .server         = server,
1261         };
1262         struct rpc_message msg = {
1263                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1264                 .rpc_argp       = &arg,
1265                 .rpc_resp       = &res,
1266                 .rpc_cred       = cred,
1267         };
1268         unsigned long timestamp = jiffies;
1269         int status;
1270
1271         nfs_fattr_init(fattr);
1272
1273         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1274                 /* Use that stateid */
1275         } else if (state != NULL) {
1276                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1277         } else
1278                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1279
1280         status = rpc_call_sync(server->client, &msg, 0);
1281         if (status == 0 && state != NULL)
1282                 renew_lease(server, timestamp);
1283         return status;
1284 }
1285
1286 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1287                            struct nfs_fattr *fattr, struct iattr *sattr,
1288                            struct nfs4_state *state)
1289 {
1290         struct nfs_server *server = NFS_SERVER(inode);
1291         struct nfs4_exception exception = { };
1292         int err;
1293         do {
1294                 err = nfs4_handle_exception(server,
1295                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1296                                 &exception);
1297         } while (exception.retry);
1298         return err;
1299 }
1300
1301 struct nfs4_closedata {
1302         struct path path;
1303         struct inode *inode;
1304         struct nfs4_state *state;
1305         struct nfs_closeargs arg;
1306         struct nfs_closeres res;
1307         struct nfs_fattr fattr;
1308         unsigned long timestamp;
1309 };
1310
1311 static void nfs4_free_closedata(void *data)
1312 {
1313         struct nfs4_closedata *calldata = data;
1314         struct nfs4_state_owner *sp = calldata->state->owner;
1315
1316         nfs4_put_open_state(calldata->state);
1317         nfs_free_seqid(calldata->arg.seqid);
1318         nfs4_put_state_owner(sp);
1319         path_put(&calldata->path);
1320         kfree(calldata);
1321 }
1322
1323 static void nfs4_close_done(struct rpc_task *task, void *data)
1324 {
1325         struct nfs4_closedata *calldata = data;
1326         struct nfs4_state *state = calldata->state;
1327         struct nfs_server *server = NFS_SERVER(calldata->inode);
1328
1329         if (RPC_ASSASSINATED(task))
1330                 return;
1331         /* hmm. we are done with the inode, and in the process of freeing
1332          * the state_owner. we keep this around to process errors
1333          */
1334         switch (task->tk_status) {
1335                 case 0:
1336                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1337                         renew_lease(server, calldata->timestamp);
1338                         break;
1339                 case -NFS4ERR_STALE_STATEID:
1340                 case -NFS4ERR_OLD_STATEID:
1341                 case -NFS4ERR_BAD_STATEID:
1342                 case -NFS4ERR_EXPIRED:
1343                         if (calldata->arg.fmode == 0)
1344                                 break;
1345                 default:
1346                         if (nfs4_async_handle_error(task, server, state) == -EAGAIN) {
1347                                 rpc_restart_call(task);
1348                                 return;
1349                         }
1350         }
1351         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1352 }
1353
1354 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1355 {
1356         struct nfs4_closedata *calldata = data;
1357         struct nfs4_state *state = calldata->state;
1358         int clear_rd, clear_wr, clear_rdwr;
1359
1360         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1361                 return;
1362
1363         clear_rd = clear_wr = clear_rdwr = 0;
1364         spin_lock(&state->owner->so_lock);
1365         /* Calculate the change in open mode */
1366         if (state->n_rdwr == 0) {
1367                 if (state->n_rdonly == 0) {
1368                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1369                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1370                 }
1371                 if (state->n_wronly == 0) {
1372                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1373                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1374                 }
1375         }
1376         spin_unlock(&state->owner->so_lock);
1377         if (!clear_rd && !clear_wr && !clear_rdwr) {
1378                 /* Note: exit _without_ calling nfs4_close_done */
1379                 task->tk_action = NULL;
1380                 return;
1381         }
1382         nfs_fattr_init(calldata->res.fattr);
1383         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1384                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1385                 calldata->arg.fmode = FMODE_READ;
1386         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1387                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1388                 calldata->arg.fmode = FMODE_WRITE;
1389         }
1390         calldata->timestamp = jiffies;
1391         rpc_call_start(task);
1392 }
1393
1394 static const struct rpc_call_ops nfs4_close_ops = {
1395         .rpc_call_prepare = nfs4_close_prepare,
1396         .rpc_call_done = nfs4_close_done,
1397         .rpc_release = nfs4_free_closedata,
1398 };
1399
1400 /*
1401  * It is possible for data to be read/written from a mem-mapped file
1402  * after the sys_close call (which hits the vfs layer as a flush).
1403  * This means that we can't safely call nfsv4 close on a file until
1404  * the inode is cleared. This in turn means that we are not good
1405  * NFSv4 citizens - we do not indicate to the server to update the file's
1406  * share state even when we are done with one of the three share
1407  * stateid's in the inode.
1408  *
1409  * NOTE: Caller must be holding the sp->so_owner semaphore!
1410  */
1411 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1412 {
1413         struct nfs_server *server = NFS_SERVER(state->inode);
1414         struct nfs4_closedata *calldata;
1415         struct nfs4_state_owner *sp = state->owner;
1416         struct rpc_task *task;
1417         struct rpc_message msg = {
1418                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1419                 .rpc_cred = state->owner->so_cred,
1420         };
1421         struct rpc_task_setup task_setup_data = {
1422                 .rpc_client = server->client,
1423                 .rpc_message = &msg,
1424                 .callback_ops = &nfs4_close_ops,
1425                 .workqueue = nfsiod_workqueue,
1426                 .flags = RPC_TASK_ASYNC,
1427         };
1428         int status = -ENOMEM;
1429
1430         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1431         if (calldata == NULL)
1432                 goto out;
1433         calldata->inode = state->inode;
1434         calldata->state = state;
1435         calldata->arg.fh = NFS_FH(state->inode);
1436         calldata->arg.stateid = &state->open_stateid;
1437         /* Serialization for the sequence id */
1438         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1439         if (calldata->arg.seqid == NULL)
1440                 goto out_free_calldata;
1441         calldata->arg.fmode = 0;
1442         calldata->arg.bitmask = server->cache_consistency_bitmask;
1443         calldata->res.fattr = &calldata->fattr;
1444         calldata->res.seqid = calldata->arg.seqid;
1445         calldata->res.server = server;
1446         calldata->path.mnt = mntget(path->mnt);
1447         calldata->path.dentry = dget(path->dentry);
1448
1449         msg.rpc_argp = &calldata->arg,
1450         msg.rpc_resp = &calldata->res,
1451         task_setup_data.callback_data = calldata;
1452         task = rpc_run_task(&task_setup_data);
1453         if (IS_ERR(task))
1454                 return PTR_ERR(task);
1455         status = 0;
1456         if (wait)
1457                 status = rpc_wait_for_completion_task(task);
1458         rpc_put_task(task);
1459         return status;
1460 out_free_calldata:
1461         kfree(calldata);
1462 out:
1463         nfs4_put_open_state(state);
1464         nfs4_put_state_owner(sp);
1465         return status;
1466 }
1467
1468 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state, fmode_t fmode)
1469 {
1470         struct file *filp;
1471         int ret;
1472
1473         /* If the open_intent is for execute, we have an extra check to make */
1474         if (fmode & FMODE_EXEC) {
1475                 ret = nfs_may_open(state->inode,
1476                                 state->owner->so_cred,
1477                                 nd->intent.open.flags);
1478                 if (ret < 0)
1479                         goto out_close;
1480         }
1481         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1482         if (!IS_ERR(filp)) {
1483                 struct nfs_open_context *ctx;
1484                 ctx = nfs_file_open_context(filp);
1485                 ctx->state = state;
1486                 return 0;
1487         }
1488         ret = PTR_ERR(filp);
1489 out_close:
1490         nfs4_close_sync(path, state, fmode & (FMODE_READ|FMODE_WRITE));
1491         return ret;
1492 }
1493
1494 struct dentry *
1495 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1496 {
1497         struct path path = {
1498                 .mnt = nd->path.mnt,
1499                 .dentry = dentry,
1500         };
1501         struct dentry *parent;
1502         struct iattr attr;
1503         struct rpc_cred *cred;
1504         struct nfs4_state *state;
1505         struct dentry *res;
1506         fmode_t fmode = nd->intent.open.flags & (FMODE_READ | FMODE_WRITE | FMODE_EXEC);
1507
1508         if (nd->flags & LOOKUP_CREATE) {
1509                 attr.ia_mode = nd->intent.open.create_mode;
1510                 attr.ia_valid = ATTR_MODE;
1511                 if (!IS_POSIXACL(dir))
1512                         attr.ia_mode &= ~current->fs->umask;
1513         } else {
1514                 attr.ia_valid = 0;
1515                 BUG_ON(nd->intent.open.flags & O_CREAT);
1516         }
1517
1518         cred = rpc_lookup_cred();
1519         if (IS_ERR(cred))
1520                 return (struct dentry *)cred;
1521         parent = dentry->d_parent;
1522         /* Protect against concurrent sillydeletes */
1523         nfs_block_sillyrename(parent);
1524         state = nfs4_do_open(dir, &path, fmode, nd->intent.open.flags, &attr, cred);
1525         put_rpccred(cred);
1526         if (IS_ERR(state)) {
1527                 if (PTR_ERR(state) == -ENOENT) {
1528                         d_add(dentry, NULL);
1529                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1530                 }
1531                 nfs_unblock_sillyrename(parent);
1532                 return (struct dentry *)state;
1533         }
1534         res = d_add_unique(dentry, igrab(state->inode));
1535         if (res != NULL)
1536                 path.dentry = res;
1537         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1538         nfs_unblock_sillyrename(parent);
1539         nfs4_intent_set_file(nd, &path, state, fmode);
1540         return res;
1541 }
1542
1543 int
1544 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1545 {
1546         struct path path = {
1547                 .mnt = nd->path.mnt,
1548                 .dentry = dentry,
1549         };
1550         struct rpc_cred *cred;
1551         struct nfs4_state *state;
1552         fmode_t fmode = openflags & (FMODE_READ | FMODE_WRITE);
1553
1554         cred = rpc_lookup_cred();
1555         if (IS_ERR(cred))
1556                 return PTR_ERR(cred);
1557         state = nfs4_do_open(dir, &path, fmode, openflags, NULL, cred);
1558         put_rpccred(cred);
1559         if (IS_ERR(state)) {
1560                 switch (PTR_ERR(state)) {
1561                         case -EPERM:
1562                         case -EACCES:
1563                         case -EDQUOT:
1564                         case -ENOSPC:
1565                         case -EROFS:
1566                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1567                                 return 1;
1568                         default:
1569                                 goto out_drop;
1570                 }
1571         }
1572         if (state->inode == dentry->d_inode) {
1573                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1574                 nfs4_intent_set_file(nd, &path, state, fmode);
1575                 return 1;
1576         }
1577         nfs4_close_sync(&path, state, fmode);
1578 out_drop:
1579         d_drop(dentry);
1580         return 0;
1581 }
1582
1583
1584 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1585 {
1586         struct nfs4_server_caps_res res = {};
1587         struct rpc_message msg = {
1588                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1589                 .rpc_argp = fhandle,
1590                 .rpc_resp = &res,
1591         };
1592         int status;
1593
1594         status = rpc_call_sync(server->client, &msg, 0);
1595         if (status == 0) {
1596                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1597                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1598                         server->caps |= NFS_CAP_ACLS;
1599                 if (res.has_links != 0)
1600                         server->caps |= NFS_CAP_HARDLINKS;
1601                 if (res.has_symlinks != 0)
1602                         server->caps |= NFS_CAP_SYMLINKS;
1603                 memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
1604                 server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
1605                 server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
1606                 server->acl_bitmask = res.acl_bitmask;
1607         }
1608         return status;
1609 }
1610
1611 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1612 {
1613         struct nfs4_exception exception = { };
1614         int err;
1615         do {
1616                 err = nfs4_handle_exception(server,
1617                                 _nfs4_server_capabilities(server, fhandle),
1618                                 &exception);
1619         } while (exception.retry);
1620         return err;
1621 }
1622
1623 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1624                 struct nfs_fsinfo *info)
1625 {
1626         struct nfs4_lookup_root_arg args = {
1627                 .bitmask = nfs4_fattr_bitmap,
1628         };
1629         struct nfs4_lookup_res res = {
1630                 .server = server,
1631                 .fattr = info->fattr,
1632                 .fh = fhandle,
1633         };
1634         struct rpc_message msg = {
1635                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1636                 .rpc_argp = &args,
1637                 .rpc_resp = &res,
1638         };
1639         nfs_fattr_init(info->fattr);
1640         return rpc_call_sync(server->client, &msg, 0);
1641 }
1642
1643 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1644                 struct nfs_fsinfo *info)
1645 {
1646         struct nfs4_exception exception = { };
1647         int err;
1648         do {
1649                 err = nfs4_handle_exception(server,
1650                                 _nfs4_lookup_root(server, fhandle, info),
1651                                 &exception);
1652         } while (exception.retry);
1653         return err;
1654 }
1655
1656 /*
1657  * get the file handle for the "/" directory on the server
1658  */
1659 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1660                               struct nfs_fsinfo *info)
1661 {
1662         int status;
1663
1664         status = nfs4_lookup_root(server, fhandle, info);
1665         if (status == 0)
1666                 status = nfs4_server_capabilities(server, fhandle);
1667         if (status == 0)
1668                 status = nfs4_do_fsinfo(server, fhandle, info);
1669         return nfs4_map_errors(status);
1670 }
1671
1672 /*
1673  * Get locations and (maybe) other attributes of a referral.
1674  * Note that we'll actually follow the referral later when
1675  * we detect fsid mismatch in inode revalidation
1676  */
1677 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1678 {
1679         int status = -ENOMEM;
1680         struct page *page = NULL;
1681         struct nfs4_fs_locations *locations = NULL;
1682
1683         page = alloc_page(GFP_KERNEL);
1684         if (page == NULL)
1685                 goto out;
1686         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1687         if (locations == NULL)
1688                 goto out;
1689
1690         status = nfs4_proc_fs_locations(dir, name, locations, page);
1691         if (status != 0)
1692                 goto out;
1693         /* Make sure server returned a different fsid for the referral */
1694         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1695                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
1696                 status = -EIO;
1697                 goto out;
1698         }
1699
1700         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1701         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1702         if (!fattr->mode)
1703                 fattr->mode = S_IFDIR;
1704         memset(fhandle, 0, sizeof(struct nfs_fh));
1705 out:
1706         if (page)
1707                 __free_page(page);
1708         if (locations)
1709                 kfree(locations);
1710         return status;
1711 }
1712
1713 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1714 {
1715         struct nfs4_getattr_arg args = {
1716                 .fh = fhandle,
1717                 .bitmask = server->attr_bitmask,
1718         };
1719         struct nfs4_getattr_res res = {
1720                 .fattr = fattr,
1721                 .server = server,
1722         };
1723         struct rpc_message msg = {
1724                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1725                 .rpc_argp = &args,
1726                 .rpc_resp = &res,
1727         };
1728
1729         nfs_fattr_init(fattr);
1730         return rpc_call_sync(server->client, &msg, 0);
1731 }
1732
1733 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1734 {
1735         struct nfs4_exception exception = { };
1736         int err;
1737         do {
1738                 err = nfs4_handle_exception(server,
1739                                 _nfs4_proc_getattr(server, fhandle, fattr),
1740                                 &exception);
1741         } while (exception.retry);
1742         return err;
1743 }
1744
1745 /*
1746  * The file is not closed if it is opened due to the a request to change
1747  * the size of the file. The open call will not be needed once the
1748  * VFS layer lookup-intents are implemented.
1749  *
1750  * Close is called when the inode is destroyed.
1751  * If we haven't opened the file for O_WRONLY, we
1752  * need to in the size_change case to obtain a stateid.
1753  *
1754  * Got race?
1755  * Because OPEN is always done by name in nfsv4, it is
1756  * possible that we opened a different file by the same
1757  * name.  We can recognize this race condition, but we
1758  * can't do anything about it besides returning an error.
1759  *
1760  * This will be fixed with VFS changes (lookup-intent).
1761  */
1762 static int
1763 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1764                   struct iattr *sattr)
1765 {
1766         struct inode *inode = dentry->d_inode;
1767         struct rpc_cred *cred = NULL;
1768         struct nfs4_state *state = NULL;
1769         int status;
1770
1771         nfs_fattr_init(fattr);
1772
1773         /* Search for an existing open(O_WRITE) file */
1774         if (sattr->ia_valid & ATTR_FILE) {
1775                 struct nfs_open_context *ctx;
1776
1777                 ctx = nfs_file_open_context(sattr->ia_file);
1778                 if (ctx) {
1779                         cred = ctx->cred;
1780                         state = ctx->state;
1781                 }
1782         }
1783
1784         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
1785         if (status == 0)
1786                 nfs_setattr_update_inode(inode, sattr);
1787         return status;
1788 }
1789
1790 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1791                 const struct qstr *name, struct nfs_fh *fhandle,
1792                 struct nfs_fattr *fattr)
1793 {
1794         int                    status;
1795         struct nfs4_lookup_arg args = {
1796                 .bitmask = server->attr_bitmask,
1797                 .dir_fh = dirfh,
1798                 .name = name,
1799         };
1800         struct nfs4_lookup_res res = {
1801                 .server = server,
1802                 .fattr = fattr,
1803                 .fh = fhandle,
1804         };
1805         struct rpc_message msg = {
1806                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1807                 .rpc_argp = &args,
1808                 .rpc_resp = &res,
1809         };
1810
1811         nfs_fattr_init(fattr);
1812
1813         dprintk("NFS call  lookupfh %s\n", name->name);
1814         status = rpc_call_sync(server->client, &msg, 0);
1815         dprintk("NFS reply lookupfh: %d\n", status);
1816         return status;
1817 }
1818
1819 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1820                               struct qstr *name, struct nfs_fh *fhandle,
1821                               struct nfs_fattr *fattr)
1822 {
1823         struct nfs4_exception exception = { };
1824         int err;
1825         do {
1826                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1827                 /* FIXME: !!!! */
1828                 if (err == -NFS4ERR_MOVED) {
1829                         err = -EREMOTE;
1830                         break;
1831                 }
1832                 err = nfs4_handle_exception(server, err, &exception);
1833         } while (exception.retry);
1834         return err;
1835 }
1836
1837 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1838                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1839 {
1840         int status;
1841
1842         dprintk("NFS call  lookup %s\n", name->name);
1843         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1844         if (status == -NFS4ERR_MOVED)
1845                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1846         dprintk("NFS reply lookup: %d\n", status);
1847         return status;
1848 }
1849
1850 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1851 {
1852         struct nfs4_exception exception = { };
1853         int err;
1854         do {
1855                 err = nfs4_handle_exception(NFS_SERVER(dir),
1856                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1857                                 &exception);
1858         } while (exception.retry);
1859         return err;
1860 }
1861
1862 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1863 {
1864         struct nfs_server *server = NFS_SERVER(inode);
1865         struct nfs_fattr fattr;
1866         struct nfs4_accessargs args = {
1867                 .fh = NFS_FH(inode),
1868                 .bitmask = server->attr_bitmask,
1869         };
1870         struct nfs4_accessres res = {
1871                 .server = server,
1872                 .fattr = &fattr,
1873         };
1874         struct rpc_message msg = {
1875                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1876                 .rpc_argp = &args,
1877                 .rpc_resp = &res,
1878                 .rpc_cred = entry->cred,
1879         };
1880         int mode = entry->mask;
1881         int status;
1882
1883         /*
1884          * Determine which access bits we want to ask for...
1885          */
1886         if (mode & MAY_READ)
1887                 args.access |= NFS4_ACCESS_READ;
1888         if (S_ISDIR(inode->i_mode)) {
1889                 if (mode & MAY_WRITE)
1890                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1891                 if (mode & MAY_EXEC)
1892                         args.access |= NFS4_ACCESS_LOOKUP;
1893         } else {
1894                 if (mode & MAY_WRITE)
1895                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1896                 if (mode & MAY_EXEC)
1897                         args.access |= NFS4_ACCESS_EXECUTE;
1898         }
1899         nfs_fattr_init(&fattr);
1900         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1901         if (!status) {
1902                 entry->mask = 0;
1903                 if (res.access & NFS4_ACCESS_READ)
1904                         entry->mask |= MAY_READ;
1905                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1906                         entry->mask |= MAY_WRITE;
1907                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1908                         entry->mask |= MAY_EXEC;
1909                 nfs_refresh_inode(inode, &fattr);
1910         }
1911         return status;
1912 }
1913
1914 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1915 {
1916         struct nfs4_exception exception = { };
1917         int err;
1918         do {
1919                 err = nfs4_handle_exception(NFS_SERVER(inode),
1920                                 _nfs4_proc_access(inode, entry),
1921                                 &exception);
1922         } while (exception.retry);
1923         return err;
1924 }
1925
1926 /*
1927  * TODO: For the time being, we don't try to get any attributes
1928  * along with any of the zero-copy operations READ, READDIR,
1929  * READLINK, WRITE.
1930  *
1931  * In the case of the first three, we want to put the GETATTR
1932  * after the read-type operation -- this is because it is hard
1933  * to predict the length of a GETATTR response in v4, and thus
1934  * align the READ data correctly.  This means that the GETATTR
1935  * may end up partially falling into the page cache, and we should
1936  * shift it into the 'tail' of the xdr_buf before processing.
1937  * To do this efficiently, we need to know the total length
1938  * of data received, which doesn't seem to be available outside
1939  * of the RPC layer.
1940  *
1941  * In the case of WRITE, we also want to put the GETATTR after
1942  * the operation -- in this case because we want to make sure
1943  * we get the post-operation mtime and size.  This means that
1944  * we can't use xdr_encode_pages() as written: we need a variant
1945  * of it which would leave room in the 'tail' iovec.
1946  *
1947  * Both of these changes to the XDR layer would in fact be quite
1948  * minor, but I decided to leave them for a subsequent patch.
1949  */
1950 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1951                 unsigned int pgbase, unsigned int pglen)
1952 {
1953         struct nfs4_readlink args = {
1954                 .fh       = NFS_FH(inode),
1955                 .pgbase   = pgbase,
1956                 .pglen    = pglen,
1957                 .pages    = &page,
1958         };
1959         struct rpc_message msg = {
1960                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1961                 .rpc_argp = &args,
1962                 .rpc_resp = NULL,
1963         };
1964
1965         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1966 }
1967
1968 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1969                 unsigned int pgbase, unsigned int pglen)
1970 {
1971         struct nfs4_exception exception = { };
1972         int err;
1973         do {
1974                 err = nfs4_handle_exception(NFS_SERVER(inode),
1975                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1976                                 &exception);
1977         } while (exception.retry);
1978         return err;
1979 }
1980
1981 /*
1982  * Got race?
1983  * We will need to arrange for the VFS layer to provide an atomic open.
1984  * Until then, this create/open method is prone to inefficiency and race
1985  * conditions due to the lookup, create, and open VFS calls from sys_open()
1986  * placed on the wire.
1987  *
1988  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1989  * The file will be opened again in the subsequent VFS open call
1990  * (nfs4_proc_file_open).
1991  *
1992  * The open for read will just hang around to be used by any process that
1993  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1994  */
1995
1996 static int
1997 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1998                  int flags, struct nameidata *nd)
1999 {
2000         struct path path = {
2001                 .mnt = nd->path.mnt,
2002                 .dentry = dentry,
2003         };
2004         struct nfs4_state *state;
2005         struct rpc_cred *cred;
2006         fmode_t fmode = flags & (FMODE_READ | FMODE_WRITE);
2007         int status = 0;
2008
2009         cred = rpc_lookup_cred();
2010         if (IS_ERR(cred)) {
2011                 status = PTR_ERR(cred);
2012                 goto out;
2013         }
2014         state = nfs4_do_open(dir, &path, fmode, flags, sattr, cred);
2015         d_drop(dentry);
2016         if (IS_ERR(state)) {
2017                 status = PTR_ERR(state);
2018                 goto out_putcred;
2019         }
2020         d_add(dentry, igrab(state->inode));
2021         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
2022         if (flags & O_EXCL) {
2023                 struct nfs_fattr fattr;
2024                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
2025                 if (status == 0)
2026                         nfs_setattr_update_inode(state->inode, sattr);
2027                 nfs_post_op_update_inode(state->inode, &fattr);
2028         }
2029         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
2030                 status = nfs4_intent_set_file(nd, &path, state, fmode);
2031         else
2032                 nfs4_close_sync(&path, state, fmode);
2033 out_putcred:
2034         put_rpccred(cred);
2035 out:
2036         return status;
2037 }
2038
2039 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
2040 {
2041         struct nfs_server *server = NFS_SERVER(dir);
2042         struct nfs_removeargs args = {
2043                 .fh = NFS_FH(dir),
2044                 .name.len = name->len,
2045                 .name.name = name->name,
2046                 .bitmask = server->attr_bitmask,
2047         };
2048         struct nfs_removeres res = {
2049                 .server = server,
2050         };
2051         struct rpc_message msg = {
2052                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
2053                 .rpc_argp = &args,
2054                 .rpc_resp = &res,
2055         };
2056         int                     status;
2057
2058         nfs_fattr_init(&res.dir_attr);
2059         status = rpc_call_sync(server->client, &msg, 0);
2060         if (status == 0) {
2061                 update_changeattr(dir, &res.cinfo);
2062                 nfs_post_op_update_inode(dir, &res.dir_attr);
2063         }
2064         return status;
2065 }
2066
2067 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
2068 {
2069         struct nfs4_exception exception = { };
2070         int err;
2071         do {
2072                 err = nfs4_handle_exception(NFS_SERVER(dir),
2073                                 _nfs4_proc_remove(dir, name),
2074                                 &exception);
2075         } while (exception.retry);
2076         return err;
2077 }
2078
2079 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
2080 {
2081         struct nfs_server *server = NFS_SERVER(dir);
2082         struct nfs_removeargs *args = msg->rpc_argp;
2083         struct nfs_removeres *res = msg->rpc_resp;
2084
2085         args->bitmask = server->cache_consistency_bitmask;
2086         res->server = server;
2087         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
2088 }
2089
2090 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
2091 {
2092         struct nfs_removeres *res = task->tk_msg.rpc_resp;
2093
2094         if (nfs4_async_handle_error(task, res->server, NULL) == -EAGAIN)
2095                 return 0;
2096         update_changeattr(dir, &res->cinfo);
2097         nfs_post_op_update_inode(dir, &res->dir_attr);
2098         return 1;
2099 }
2100
2101 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2102                 struct inode *new_dir, struct qstr *new_name)
2103 {
2104         struct nfs_server *server = NFS_SERVER(old_dir);
2105         struct nfs4_rename_arg arg = {
2106                 .old_dir = NFS_FH(old_dir),
2107                 .new_dir = NFS_FH(new_dir),
2108                 .old_name = old_name,
2109                 .new_name = new_name,
2110                 .bitmask = server->attr_bitmask,
2111         };
2112         struct nfs_fattr old_fattr, new_fattr;
2113         struct nfs4_rename_res res = {
2114                 .server = server,
2115                 .old_fattr = &old_fattr,
2116                 .new_fattr = &new_fattr,
2117         };
2118         struct rpc_message msg = {
2119                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2120                 .rpc_argp = &arg,
2121                 .rpc_resp = &res,
2122         };
2123         int                     status;
2124
2125         nfs_fattr_init(res.old_fattr);
2126         nfs_fattr_init(res.new_fattr);
2127         status = rpc_call_sync(server->client, &msg, 0);
2128
2129         if (!status) {
2130                 update_changeattr(old_dir, &res.old_cinfo);
2131                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2132                 update_changeattr(new_dir, &res.new_cinfo);
2133                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2134         }
2135         return status;
2136 }
2137
2138 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2139                 struct inode *new_dir, struct qstr *new_name)
2140 {
2141         struct nfs4_exception exception = { };
2142         int err;
2143         do {
2144                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2145                                 _nfs4_proc_rename(old_dir, old_name,
2146                                         new_dir, new_name),
2147                                 &exception);
2148         } while (exception.retry);
2149         return err;
2150 }
2151
2152 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2153 {
2154         struct nfs_server *server = NFS_SERVER(inode);
2155         struct nfs4_link_arg arg = {
2156                 .fh     = NFS_FH(inode),
2157                 .dir_fh = NFS_FH(dir),
2158                 .name   = name,
2159                 .bitmask = server->attr_bitmask,
2160         };
2161         struct nfs_fattr fattr, dir_attr;
2162         struct nfs4_link_res res = {
2163                 .server = server,
2164                 .fattr = &fattr,
2165                 .dir_attr = &dir_attr,
2166         };
2167         struct rpc_message msg = {
2168                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2169                 .rpc_argp = &arg,
2170                 .rpc_resp = &res,
2171         };
2172         int                     status;
2173
2174         nfs_fattr_init(res.fattr);
2175         nfs_fattr_init(res.dir_attr);
2176         status = rpc_call_sync(server->client, &msg, 0);
2177         if (!status) {
2178                 update_changeattr(dir, &res.cinfo);
2179                 nfs_post_op_update_inode(dir, res.dir_attr);
2180                 nfs_post_op_update_inode(inode, res.fattr);
2181         }
2182
2183         return status;
2184 }
2185
2186 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2187 {
2188         struct nfs4_exception exception = { };
2189         int err;
2190         do {
2191                 err = nfs4_handle_exception(NFS_SERVER(inode),
2192                                 _nfs4_proc_link(inode, dir, name),
2193                                 &exception);
2194         } while (exception.retry);
2195         return err;
2196 }
2197
2198 struct nfs4_createdata {
2199         struct rpc_message msg;
2200         struct nfs4_create_arg arg;
2201         struct nfs4_create_res res;
2202         struct nfs_fh fh;
2203         struct nfs_fattr fattr;
2204         struct nfs_fattr dir_fattr;
2205 };
2206
2207 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2208                 struct qstr *name, struct iattr *sattr, u32 ftype)
2209 {
2210         struct nfs4_createdata *data;
2211
2212         data = kzalloc(sizeof(*data), GFP_KERNEL);
2213         if (data != NULL) {
2214                 struct nfs_server *server = NFS_SERVER(dir);
2215
2216                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2217                 data->msg.rpc_argp = &data->arg;
2218                 data->msg.rpc_resp = &data->res;
2219                 data->arg.dir_fh = NFS_FH(dir);
2220                 data->arg.server = server;
2221                 data->arg.name = name;
2222                 data->arg.attrs = sattr;
2223                 data->arg.ftype = ftype;
2224                 data->arg.bitmask = server->attr_bitmask;
2225                 data->res.server = server;
2226                 data->res.fh = &data->fh;
2227                 data->res.fattr = &data->fattr;
2228                 data->res.dir_fattr = &data->dir_fattr;
2229                 nfs_fattr_init(data->res.fattr);
2230                 nfs_fattr_init(data->res.dir_fattr);
2231         }
2232         return data;
2233 }
2234
2235 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2236 {
2237         int status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
2238         if (status == 0) {
2239                 update_changeattr(dir, &data->res.dir_cinfo);
2240                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2241                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2242         }
2243         return status;
2244 }
2245
2246 static void nfs4_free_createdata(struct nfs4_createdata *data)
2247 {
2248         kfree(data);
2249 }
2250
2251 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2252                 struct page *page, unsigned int len, struct iattr *sattr)
2253 {
2254         struct nfs4_createdata *data;
2255         int status = -ENAMETOOLONG;
2256
2257         if (len > NFS4_MAXPATHLEN)
2258                 goto out;
2259
2260         status = -ENOMEM;
2261         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2262         if (data == NULL)
2263                 goto out;
2264
2265         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2266         data->arg.u.symlink.pages = &page;
2267         data->arg.u.symlink.len = len;
2268
2269         status = nfs4_do_create(dir, dentry, data);
2270
2271         nfs4_free_createdata(data);
2272 out:
2273         return status;
2274 }
2275
2276 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2277                 struct page *page, unsigned int len, struct iattr *sattr)
2278 {
2279         struct nfs4_exception exception = { };
2280         int err;
2281         do {
2282                 err = nfs4_handle_exception(NFS_SERVER(dir),
2283                                 _nfs4_proc_symlink(dir, dentry, page,
2284                                                         len, sattr),
2285                                 &exception);
2286         } while (exception.retry);
2287         return err;
2288 }
2289
2290 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2291                 struct iattr *sattr)
2292 {
2293         struct nfs4_createdata *data;
2294         int status = -ENOMEM;
2295
2296         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2297         if (data == NULL)
2298                 goto out;
2299
2300         status = nfs4_do_create(dir, dentry, data);
2301
2302         nfs4_free_createdata(data);
2303 out:
2304         return status;
2305 }
2306
2307 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2308                 struct iattr *sattr)
2309 {
2310         struct nfs4_exception exception = { };
2311         int err;
2312         do {
2313                 err = nfs4_handle_exception(NFS_SERVER(dir),
2314                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2315                                 &exception);
2316         } while (exception.retry);
2317         return err;
2318 }
2319
2320 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2321                   u64 cookie, struct page *page, unsigned int count, int plus)
2322 {
2323         struct inode            *dir = dentry->d_inode;
2324         struct nfs4_readdir_arg args = {
2325                 .fh = NFS_FH(dir),
2326                 .pages = &page,
2327                 .pgbase = 0,
2328                 .count = count,
2329                 .bitmask = NFS_SERVER(dentry->d_inode)->cache_consistency_bitmask,
2330         };
2331         struct nfs4_readdir_res res;
2332         struct rpc_message msg = {
2333                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2334                 .rpc_argp = &args,
2335                 .rpc_resp = &res,
2336                 .rpc_cred = cred,
2337         };
2338         int                     status;
2339
2340         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2341                         dentry->d_parent->d_name.name,
2342                         dentry->d_name.name,
2343                         (unsigned long long)cookie);
2344         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2345         res.pgbase = args.pgbase;
2346         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2347         if (status == 0)
2348                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2349
2350         nfs_invalidate_atime(dir);
2351
2352         dprintk("%s: returns %d\n", __func__, status);
2353         return status;
2354 }
2355
2356 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2357                   u64 cookie, struct page *page, unsigned int count, int plus)
2358 {
2359         struct nfs4_exception exception = { };
2360         int err;
2361         do {
2362                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2363                                 _nfs4_proc_readdir(dentry, cred, cookie,
2364                                         page, count, plus),
2365                                 &exception);
2366         } while (exception.retry);
2367         return err;
2368 }
2369
2370 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2371                 struct iattr *sattr, dev_t rdev)
2372 {
2373         struct nfs4_createdata *data;
2374         int mode = sattr->ia_mode;
2375         int status = -ENOMEM;
2376
2377         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2378         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2379
2380         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2381         if (data == NULL)
2382                 goto out;
2383
2384         if (S_ISFIFO(mode))
2385                 data->arg.ftype = NF4FIFO;
2386         else if (S_ISBLK(mode)) {
2387                 data->arg.ftype = NF4BLK;
2388                 data->arg.u.device.specdata1 = MAJOR(rdev);
2389                 data->arg.u.device.specdata2 = MINOR(rdev);
2390         }
2391         else if (S_ISCHR(mode)) {
2392                 data->arg.ftype = NF4CHR;
2393                 data->arg.u.device.specdata1 = MAJOR(rdev);
2394                 data->arg.u.device.specdata2 = MINOR(rdev);
2395         }
2396
2397         status = nfs4_do_create(dir, dentry, data);
2398
2399         nfs4_free_createdata(data);
2400 out:
2401         return status;
2402 }
2403
2404 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2405                 struct iattr *sattr, dev_t rdev)
2406 {
2407         struct nfs4_exception exception = { };
2408         int err;
2409         do {
2410                 err = nfs4_handle_exception(NFS_SERVER(dir),
2411                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2412                                 &exception);
2413         } while (exception.retry);
2414         return err;
2415 }
2416
2417 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2418                  struct nfs_fsstat *fsstat)
2419 {
2420         struct nfs4_statfs_arg args = {
2421                 .fh = fhandle,
2422                 .bitmask = server->attr_bitmask,
2423         };
2424         struct rpc_message msg = {
2425                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2426                 .rpc_argp = &args,
2427                 .rpc_resp = fsstat,
2428         };
2429
2430         nfs_fattr_init(fsstat->fattr);
2431         return rpc_call_sync(server->client, &msg, 0);
2432 }
2433
2434 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2435 {
2436         struct nfs4_exception exception = { };
2437         int err;
2438         do {
2439                 err = nfs4_handle_exception(server,
2440                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2441                                 &exception);
2442         } while (exception.retry);
2443         return err;
2444 }
2445
2446 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2447                 struct nfs_fsinfo *fsinfo)
2448 {
2449         struct nfs4_fsinfo_arg args = {
2450                 .fh = fhandle,
2451                 .bitmask = server->attr_bitmask,
2452         };
2453         struct rpc_message msg = {
2454                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2455                 .rpc_argp = &args,
2456                 .rpc_resp = fsinfo,
2457         };
2458
2459         return rpc_call_sync(server->client, &msg, 0);
2460 }
2461
2462 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2463 {
2464         struct nfs4_exception exception = { };
2465         int err;
2466
2467         do {
2468                 err = nfs4_handle_exception(server,
2469                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2470                                 &exception);
2471         } while (exception.retry);
2472         return err;
2473 }
2474
2475 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2476 {
2477         nfs_fattr_init(fsinfo->fattr);
2478         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2479 }
2480
2481 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2482                 struct nfs_pathconf *pathconf)
2483 {
2484         struct nfs4_pathconf_arg args = {
2485                 .fh = fhandle,
2486                 .bitmask = server->attr_bitmask,
2487         };
2488         struct rpc_message msg = {
2489                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2490                 .rpc_argp = &args,
2491                 .rpc_resp = pathconf,
2492         };
2493
2494         /* None of the pathconf attributes are mandatory to implement */
2495         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2496                 memset(pathconf, 0, sizeof(*pathconf));
2497                 return 0;
2498         }
2499
2500         nfs_fattr_init(pathconf->fattr);
2501         return rpc_call_sync(server->client, &msg, 0);
2502 }
2503
2504 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2505                 struct nfs_pathconf *pathconf)
2506 {
2507         struct nfs4_exception exception = { };
2508         int err;
2509
2510         do {
2511                 err = nfs4_handle_exception(server,
2512                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2513                                 &exception);
2514         } while (exception.retry);
2515         return err;
2516 }
2517
2518 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2519 {
2520         struct nfs_server *server = NFS_SERVER(data->inode);
2521
2522         if (nfs4_async_handle_error(task, server, data->args.context->state) == -EAGAIN) {
2523                 rpc_restart_call(task);
2524                 return -EAGAIN;
2525         }
2526
2527         nfs_invalidate_atime(data->inode);
2528         if (task->tk_status > 0)
2529                 renew_lease(server, data->timestamp);
2530         return 0;
2531 }
2532
2533 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2534 {
2535         data->timestamp   = jiffies;
2536         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2537 }
2538
2539 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2540 {
2541         struct inode *inode = data->inode;
2542
2543         if (nfs4_async_handle_error(task, NFS_SERVER(inode), data->args.context->state) == -EAGAIN) {
2544                 rpc_restart_call(task);
2545                 return -EAGAIN;
2546         }
2547         if (task->tk_status >= 0) {
2548                 renew_lease(NFS_SERVER(inode), data->timestamp);
2549                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2550         }
2551         return 0;
2552 }
2553
2554 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2555 {
2556         struct nfs_server *server = NFS_SERVER(data->inode);
2557
2558         data->args.bitmask = server->cache_consistency_bitmask;
2559         data->res.server = server;
2560         data->timestamp   = jiffies;
2561
2562         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2563 }
2564
2565 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2566 {
2567         struct inode *inode = data->inode;
2568
2569         if (nfs4_async_handle_error(task, NFS_SERVER(inode), NULL) == -EAGAIN) {
2570                 rpc_restart_call(task);
2571                 return -EAGAIN;
2572         }
2573         nfs_refresh_inode(inode, data->res.fattr);
2574         return 0;
2575 }
2576
2577 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2578 {
2579         struct nfs_server *server = NFS_SERVER(data->inode);
2580
2581         data->args.bitmask = server->cache_consistency_bitmask;
2582         data->res.server = server;
2583         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2584 }
2585
2586 /*
2587  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2588  * standalone procedure for queueing an asynchronous RENEW.
2589  */
2590 static void nfs4_renew_done(struct rpc_task *task, void *data)
2591 {
2592         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2593         unsigned long timestamp = (unsigned long)data;
2594
2595         if (task->tk_status < 0) {
2596                 switch (task->tk_status) {
2597                         case -NFS4ERR_STALE_CLIENTID:
2598                         case -NFS4ERR_EXPIRED:
2599                         case -NFS4ERR_CB_PATH_DOWN:
2600                                 nfs4_schedule_state_recovery(clp);
2601                 }
2602                 return;
2603         }
2604         spin_lock(&clp->cl_lock);
2605         if (time_before(clp->cl_last_renewal,timestamp))
2606                 clp->cl_last_renewal = timestamp;
2607         spin_unlock(&clp->cl_lock);
2608 }
2609
2610 static const struct rpc_call_ops nfs4_renew_ops = {
2611         .rpc_call_done = nfs4_renew_done,
2612 };
2613
2614 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2615 {
2616         struct rpc_message msg = {
2617                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2618                 .rpc_argp       = clp,
2619                 .rpc_cred       = cred,
2620         };
2621
2622         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2623                         &nfs4_renew_ops, (void *)jiffies);
2624 }
2625
2626 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2627 {
2628         struct rpc_message msg = {
2629                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2630                 .rpc_argp       = clp,
2631                 .rpc_cred       = cred,
2632         };
2633         unsigned long now = jiffies;
2634         int status;
2635
2636         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2637         if (status < 0)
2638                 return status;
2639         spin_lock(&clp->cl_lock);
2640         if (time_before(clp->cl_last_renewal,now))
2641                 clp->cl_last_renewal = now;
2642         spin_unlock(&clp->cl_lock);
2643         return 0;
2644 }
2645
2646 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2647 {
2648         return (server->caps & NFS_CAP_ACLS)
2649                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2650                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2651 }
2652
2653 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2654  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2655  * the stack.
2656  */
2657 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2658
2659 static void buf_to_pages(const void *buf, size_t buflen,
2660                 struct page **pages, unsigned int *pgbase)
2661 {
2662         const void *p = buf;
2663
2664         *pgbase = offset_in_page(buf);
2665         p -= *pgbase;
2666         while (p < buf + buflen) {
2667                 *(pages++) = virt_to_page(p);
2668                 p += PAGE_CACHE_SIZE;
2669         }
2670 }
2671
2672 struct nfs4_cached_acl {
2673         int cached;
2674         size_t len;
2675         char data[0];
2676 };
2677
2678 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2679 {
2680         struct nfs_inode *nfsi = NFS_I(inode);
2681
2682         spin_lock(&inode->i_lock);
2683         kfree(nfsi->nfs4_acl);
2684         nfsi->nfs4_acl = acl;
2685         spin_unlock(&inode->i_lock);
2686 }
2687
2688 static void nfs4_zap_acl_attr(struct inode *inode)
2689 {
2690         nfs4_set_cached_acl(inode, NULL);
2691 }
2692
2693 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2694 {
2695         struct nfs_inode *nfsi = NFS_I(inode);
2696         struct nfs4_cached_acl *acl;
2697         int ret = -ENOENT;
2698
2699         spin_lock(&inode->i_lock);
2700         acl = nfsi->nfs4_acl;
2701         if (acl == NULL)
2702                 goto out;
2703         if (buf == NULL) /* user is just asking for length */
2704                 goto out_len;
2705         if (acl->cached == 0)
2706                 goto out;
2707         ret = -ERANGE; /* see getxattr(2) man page */
2708         if (acl->len > buflen)
2709                 goto out;
2710         memcpy(buf, acl->data, acl->len);
2711 out_len:
2712         ret = acl->len;
2713 out:
2714         spin_unlock(&inode->i_lock);
2715         return ret;
2716 }
2717
2718 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2719 {
2720         struct nfs4_cached_acl *acl;
2721
2722         if (buf && acl_len <= PAGE_SIZE) {
2723                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2724                 if (acl == NULL)
2725                         goto out;
2726                 acl->cached = 1;
2727                 memcpy(acl->data, buf, acl_len);
2728         } else {
2729                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2730                 if (acl == NULL)
2731                         goto out;
2732                 acl->cached = 0;
2733         }
2734         acl->len = acl_len;
2735 out:
2736         nfs4_set_cached_acl(inode, acl);
2737 }
2738
2739 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2740 {
2741         struct page *pages[NFS4ACL_MAXPAGES];
2742         struct nfs_getaclargs args = {
2743                 .fh = NFS_FH(inode),
2744                 .acl_pages = pages,
2745                 .acl_len = buflen,
2746         };
2747         size_t resp_len = buflen;
2748         void *resp_buf;
2749         struct rpc_message msg = {
2750                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2751                 .rpc_argp = &args,
2752                 .rpc_resp = &resp_len,
2753         };
2754         struct page *localpage = NULL;
2755         int ret;
2756
2757         if (buflen < PAGE_SIZE) {
2758                 /* As long as we're doing a round trip to the server anyway,
2759                  * let's be prepared for a page of acl data. */
2760                 localpage = alloc_page(GFP_KERNEL);
2761                 resp_buf = page_address(localpage);
2762                 if (localpage == NULL)
2763                         return -ENOMEM;
2764                 args.acl_pages[0] = localpage;
2765                 args.acl_pgbase = 0;
2766                 resp_len = args.acl_len = PAGE_SIZE;
2767         } else {
2768                 resp_buf = buf;
2769                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2770         }
2771         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2772         if (ret)
2773                 goto out_free;
2774         if (resp_len > args.acl_len)
2775                 nfs4_write_cached_acl(inode, NULL, resp_len);
2776         else
2777                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2778         if (buf) {
2779                 ret = -ERANGE;
2780                 if (resp_len > buflen)
2781                         goto out_free;
2782                 if (localpage)
2783                         memcpy(buf, resp_buf, resp_len);
2784         }
2785         ret = resp_len;
2786 out_free:
2787         if (localpage)
2788                 __free_page(localpage);
2789         return ret;
2790 }
2791
2792 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2793 {
2794         struct nfs4_exception exception = { };
2795         ssize_t ret;
2796         do {
2797                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2798                 if (ret >= 0)
2799                         break;
2800                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2801         } while (exception.retry);
2802         return ret;
2803 }
2804
2805 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2806 {
2807         struct nfs_server *server = NFS_SERVER(inode);
2808         int ret;
2809
2810         if (!nfs4_server_supports_acls(server))
2811                 return -EOPNOTSUPP;
2812         ret = nfs_revalidate_inode(server, inode);
2813         if (ret < 0)
2814                 return ret;
2815         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
2816                 nfs_zap_acl_cache(inode);
2817         ret = nfs4_read_cached_acl(inode, buf, buflen);
2818         if (ret != -ENOENT)
2819                 return ret;
2820         return nfs4_get_acl_uncached(inode, buf, buflen);
2821 }
2822
2823 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2824 {
2825         struct nfs_server *server = NFS_SERVER(inode);
2826         struct page *pages[NFS4ACL_MAXPAGES];
2827         struct nfs_setaclargs arg = {
2828                 .fh             = NFS_FH(inode),
2829                 .acl_pages      = pages,
2830                 .acl_len        = buflen,
2831         };
2832         struct rpc_message msg = {
2833                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2834                 .rpc_argp       = &arg,
2835                 .rpc_resp       = NULL,
2836         };
2837         int ret;
2838
2839         if (!nfs4_server_supports_acls(server))
2840                 return -EOPNOTSUPP;
2841         nfs_inode_return_delegation(inode);
2842         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2843         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2844         nfs_access_zap_cache(inode);
2845         nfs_zap_acl_cache(inode);
2846         return ret;
2847 }
2848
2849 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2850 {
2851         struct nfs4_exception exception = { };
2852         int err;
2853         do {
2854                 err = nfs4_handle_exception(NFS_SERVER(inode),
2855                                 __nfs4_proc_set_acl(inode, buf, buflen),
2856                                 &exception);
2857         } while (exception.retry);
2858         return err;
2859 }
2860
2861 static int
2862 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
2863 {
2864         struct nfs_client *clp = server->nfs_client;
2865
2866         if (!clp || task->tk_status >= 0)
2867                 return 0;
2868         switch(task->tk_status) {
2869                 case -NFS4ERR_ADMIN_REVOKED:
2870                 case -NFS4ERR_BAD_STATEID:
2871                 case -NFS4ERR_OPENMODE:
2872                         if (state == NULL)
2873                                 break;
2874                         nfs4_state_mark_reclaim_nograce(clp, state);
2875                 case -NFS4ERR_STALE_CLIENTID:
2876                 case -NFS4ERR_STALE_STATEID:
2877                 case -NFS4ERR_EXPIRED:
2878                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
2879                         nfs4_schedule_state_recovery(clp);
2880                         if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
2881                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
2882                         task->tk_status = 0;
2883                         return -EAGAIN;
2884                 case -NFS4ERR_DELAY:
2885                         nfs_inc_server_stats(server, NFSIOS_DELAY);
2886                 case -NFS4ERR_GRACE:
2887                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2888                         task->tk_status = 0;
2889                         return -EAGAIN;
2890                 case -NFS4ERR_OLD_STATEID:
2891                         task->tk_status = 0;
2892                         return -EAGAIN;
2893         }
2894         task->tk_status = nfs4_map_errors(task->tk_status);
2895         return 0;
2896 }
2897
2898 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2899 {
2900         nfs4_verifier sc_verifier;
2901         struct nfs4_setclientid setclientid = {
2902                 .sc_verifier = &sc_verifier,
2903                 .sc_prog = program,
2904         };
2905         struct rpc_message msg = {
2906                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2907                 .rpc_argp = &setclientid,
2908                 .rpc_resp = clp,
2909                 .rpc_cred = cred,
2910         };
2911         __be32 *p;
2912         int loop = 0;
2913         int status;
2914
2915         p = (__be32*)sc_verifier.data;
2916         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2917         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2918
2919         for(;;) {
2920                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2921                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
2922                                 clp->cl_ipaddr,
2923                                 rpc_peeraddr2str(clp->cl_rpcclient,
2924                                                         RPC_DISPLAY_ADDR),
2925                                 rpc_peeraddr2str(clp->cl_rpcclient,
2926                                                         RPC_DISPLAY_PROTO),
2927                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
2928                                 clp->cl_id_uniquifier);
2929                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2930                                 sizeof(setclientid.sc_netid),
2931                                 rpc_peeraddr2str(clp->cl_rpcclient,
2932                                                         RPC_DISPLAY_NETID));
2933                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2934                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
2935                                 clp->cl_ipaddr, port >> 8, port & 255);
2936
2937                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2938                 if (status != -NFS4ERR_CLID_INUSE)
2939                         break;
2940                 if (signalled())
2941                         break;
2942                 if (loop++ & 1)
2943                         ssleep(clp->cl_lease_time + 1);
2944                 else
2945                         if (++clp->cl_id_uniquifier == 0)
2946                                 break;
2947         }
2948         return status;
2949 }
2950
2951 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2952 {
2953         struct nfs_fsinfo fsinfo;
2954         struct rpc_message msg = {
2955                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2956                 .rpc_argp = clp,
2957                 .rpc_resp = &fsinfo,
2958                 .rpc_cred = cred,
2959         };
2960         unsigned long now;
2961         int status;
2962
2963         now = jiffies;
2964         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2965         if (status == 0) {
2966                 spin_lock(&clp->cl_lock);
2967                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2968                 clp->cl_last_renewal = now;
2969                 spin_unlock(&clp->cl_lock);
2970         }
2971         return status;
2972 }
2973
2974 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2975 {
2976         long timeout = 0;
2977         int err;
2978         do {
2979                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2980                 switch (err) {
2981                         case 0:
2982                                 return err;
2983                         case -NFS4ERR_RESOURCE:
2984                                 /* The IBM lawyers misread another document! */
2985                         case -NFS4ERR_DELAY:
2986                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2987                 }
2988         } while (err == 0);
2989         return err;
2990 }
2991
2992 struct nfs4_delegreturndata {
2993         struct nfs4_delegreturnargs args;
2994         struct nfs4_delegreturnres res;
2995         struct nfs_fh fh;
2996         nfs4_stateid stateid;
2997         unsigned long timestamp;
2998         struct nfs_fattr fattr;
2999         int rpc_status;
3000 };
3001
3002 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
3003 {
3004         struct nfs4_delegreturndata *data = calldata;
3005         data->rpc_status = task->tk_status;
3006         if (data->rpc_status == 0)
3007                 renew_lease(data->res.server, data->timestamp);
3008 }
3009
3010 static void nfs4_delegreturn_release(void *calldata)
3011 {
3012         kfree(calldata);
3013 }
3014
3015 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3016         .rpc_call_done = nfs4_delegreturn_done,
3017         .rpc_release = nfs4_delegreturn_release,
3018 };
3019
3020 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3021 {
3022         struct nfs4_delegreturndata *data;
3023         struct nfs_server *server = NFS_SERVER(inode);
3024         struct rpc_task *task;
3025         struct rpc_message msg = {
3026                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
3027                 .rpc_cred = cred,
3028         };
3029         struct rpc_task_setup task_setup_data = {
3030                 .rpc_client = server->client,
3031                 .rpc_message = &msg,
3032                 .callback_ops = &nfs4_delegreturn_ops,
3033                 .flags = RPC_TASK_ASYNC,
3034         };
3035         int status = 0;
3036
3037         data = kmalloc(sizeof(*data), GFP_KERNEL);
3038         if (data == NULL)
3039                 return -ENOMEM;
3040         data->args.fhandle = &data->fh;
3041         data->args.stateid = &data->stateid;
3042         data->args.bitmask = server->attr_bitmask;
3043         nfs_copy_fh(&data->fh, NFS_FH(inode));
3044         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3045         data->res.fattr = &data->fattr;
3046         data->res.server = server;
3047         nfs_fattr_init(data->res.fattr);
3048         data->timestamp = jiffies;
3049         data->rpc_status = 0;
3050
3051         task_setup_data.callback_data = data;
3052         msg.rpc_argp = &data->args,
3053         msg.rpc_resp = &data->res,
3054         task = rpc_run_task(&task_setup_data);
3055         if (IS_ERR(task))
3056                 return PTR_ERR(task);
3057         if (!issync)
3058                 goto out;
3059         status = nfs4_wait_for_completion_rpc_task(task);
3060         if (status != 0)
3061                 goto out;
3062         status = data->rpc_status;
3063         if (status != 0)
3064                 goto out;
3065         nfs_refresh_inode(inode, &data->fattr);
3066 out:
3067         rpc_put_task(task);
3068         return status;
3069 }
3070
3071 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3072 {
3073         struct nfs_server *server = NFS_SERVER(inode);
3074         struct nfs4_exception exception = { };
3075         int err;
3076         do {
3077                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3078                 switch (err) {
3079                         case -NFS4ERR_STALE_STATEID:
3080                         case -NFS4ERR_EXPIRED:
3081                         case 0:
3082                                 return 0;
3083                 }
3084                 err = nfs4_handle_exception(server, err, &exception);
3085         } while (exception.retry);
3086         return err;
3087 }
3088
3089 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3090 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3091
3092 /*
3093  * sleep, with exponential backoff, and retry the LOCK operation.
3094  */
3095 static unsigned long
3096 nfs4_set_lock_task_retry(unsigned long timeout)
3097 {
3098         schedule_timeout_killable(timeout);
3099         timeout <<= 1;
3100         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3101                 return NFS4_LOCK_MAXTIMEOUT;
3102         return timeout;
3103 }
3104
3105 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3106 {
3107         struct inode *inode = state->inode;
3108         struct nfs_server *server = NFS_SERVER(inode);
3109         struct nfs_client *clp = server->nfs_client;
3110         struct nfs_lockt_args arg = {
3111                 .fh = NFS_FH(inode),
3112                 .fl = request,
3113         };
3114         struct nfs_lockt_res res = {
3115                 .denied = request,
3116         };
3117         struct rpc_message msg = {
3118                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3119                 .rpc_argp       = &arg,
3120                 .rpc_resp       = &res,
3121                 .rpc_cred       = state->owner->so_cred,
3122         };
3123         struct nfs4_lock_state *lsp;
3124         int status;
3125
3126         arg.lock_owner.clientid = clp->cl_clientid;
3127         status = nfs4_set_lock_state(state, request);
3128         if (status != 0)
3129                 goto out;
3130         lsp = request->fl_u.nfs4_fl.owner;
3131         arg.lock_owner.id = lsp->ls_id.id;
3132         status = rpc_call_sync(server->client, &msg, 0);
3133         switch (status) {
3134                 case 0:
3135                         request->fl_type = F_UNLCK;
3136                         break;
3137                 case -NFS4ERR_DENIED:
3138                         status = 0;
3139         }
3140         request->fl_ops->fl_release_private(request);
3141 out:
3142         return status;
3143 }
3144
3145 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3146 {
3147         struct nfs4_exception exception = { };
3148         int err;
3149
3150         do {
3151                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3152                                 _nfs4_proc_getlk(state, cmd, request),
3153                                 &exception);
3154         } while (exception.retry);
3155         return err;
3156 }
3157
3158 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3159 {
3160         int res = 0;
3161         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3162                 case FL_POSIX:
3163                         res = posix_lock_file_wait(file, fl);
3164                         break;
3165                 case FL_FLOCK:
3166                         res = flock_lock_file_wait(file, fl);
3167                         break;
3168                 default:
3169                         BUG();
3170         }
3171         return res;
3172 }
3173
3174 struct nfs4_unlockdata {
3175         struct nfs_locku_args arg;
3176         struct nfs_locku_res res;
3177         struct nfs4_lock_state *lsp;
3178         struct nfs_open_context *ctx;
3179         struct file_lock fl;
3180         const struct nfs_server *server;
3181         unsigned long timestamp;
3182 };
3183
3184 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3185                 struct nfs_open_context *ctx,
3186                 struct nfs4_lock_state *lsp,
3187                 struct nfs_seqid *seqid)
3188 {
3189         struct nfs4_unlockdata *p;
3190         struct inode *inode = lsp->ls_state->inode;
3191
3192         p = kmalloc(sizeof(*p), GFP_KERNEL);
3193         if (p == NULL)
3194                 return NULL;
3195         p->arg.fh = NFS_FH(inode);
3196         p->arg.fl = &p->fl;
3197         p->arg.seqid = seqid;
3198         p->res.seqid = seqid;
3199         p->arg.stateid = &lsp->ls_stateid;
3200         p->lsp = lsp;
3201         atomic_inc(&lsp->ls_count);
3202         /* Ensure we don't close file until we're done freeing locks! */
3203         p->ctx = get_nfs_open_context(ctx);
3204         memcpy(&p->fl, fl, sizeof(p->fl));
3205         p->server = NFS_SERVER(inode);
3206         return p;
3207 }
3208
3209 static void nfs4_locku_release_calldata(void *data)
3210 {
3211         struct nfs4_unlockdata *calldata = data;
3212         nfs_free_seqid(calldata->arg.seqid);
3213         nfs4_put_lock_state(calldata->lsp);
3214         put_nfs_open_context(calldata->ctx);
3215         kfree(calldata);
3216 }
3217
3218 static void nfs4_locku_done(struct rpc_task *task, void *data)
3219 {
3220         struct nfs4_unlockdata *calldata = data;
3221
3222         if (RPC_ASSASSINATED(task))
3223                 return;
3224         switch (task->tk_status) {
3225                 case 0:
3226                         memcpy(calldata->lsp->ls_stateid.data,
3227                                         calldata->res.stateid.data,
3228                                         sizeof(calldata->lsp->ls_stateid.data));
3229                         renew_lease(calldata->server, calldata->timestamp);
3230                         break;
3231                 case -NFS4ERR_BAD_STATEID:
3232                 case -NFS4ERR_OLD_STATEID:
3233                 case -NFS4ERR_STALE_STATEID:
3234                 case -NFS4ERR_EXPIRED:
3235                         break;
3236                 default:
3237                         if (nfs4_async_handle_error(task, calldata->server, NULL) == -EAGAIN)
3238                                 rpc_restart_call(task);
3239         }
3240 }
3241
3242 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3243 {
3244         struct nfs4_unlockdata *calldata = data;
3245
3246         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3247                 return;
3248         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3249                 /* Note: exit _without_ running nfs4_locku_done */
3250                 task->tk_action = NULL;
3251                 return;
3252         }
3253         calldata->timestamp = jiffies;
3254         rpc_call_start(task);
3255 }
3256
3257 static const struct rpc_call_ops nfs4_locku_ops = {
3258         .rpc_call_prepare = nfs4_locku_prepare,
3259         .rpc_call_done = nfs4_locku_done,
3260         .rpc_release = nfs4_locku_release_calldata,
3261 };
3262
3263 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3264                 struct nfs_open_context *ctx,
3265                 struct nfs4_lock_state *lsp,
3266                 struct nfs_seqid *seqid)
3267 {
3268         struct nfs4_unlockdata *data;
3269         struct rpc_message msg = {
3270                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3271                 .rpc_cred = ctx->cred,
3272         };
3273         struct rpc_task_setup task_setup_data = {
3274                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3275                 .rpc_message = &msg,
3276                 .callback_ops = &nfs4_locku_ops,
3277                 .workqueue = nfsiod_workqueue,
3278                 .flags = RPC_TASK_ASYNC,
3279         };
3280
3281         /* Ensure this is an unlock - when canceling a lock, the
3282          * canceled lock is passed in, and it won't be an unlock.
3283          */
3284         fl->fl_type = F_UNLCK;
3285
3286         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3287         if (data == NULL) {
3288                 nfs_free_seqid(seqid);
3289                 return ERR_PTR(-ENOMEM);
3290         }
3291
3292         msg.rpc_argp = &data->arg,
3293         msg.rpc_resp = &data->res,
3294         task_setup_data.callback_data = data;
3295         return rpc_run_task(&task_setup_data);
3296 }
3297
3298 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3299 {
3300         struct nfs_inode *nfsi = NFS_I(state->inode);
3301         struct nfs_seqid *seqid;
3302         struct nfs4_lock_state *lsp;
3303         struct rpc_task *task;
3304         int status = 0;
3305         unsigned char fl_flags = request->fl_flags;
3306
3307         status = nfs4_set_lock_state(state, request);
3308         /* Unlock _before_ we do the RPC call */
3309         request->fl_flags |= FL_EXISTS;
3310         down_read(&nfsi->rwsem);
3311         if (do_vfs_lock(request->fl_file, request) == -ENOENT) {
3312                 up_read(&nfsi->rwsem);
3313                 goto out;
3314         }
3315         up_read(&nfsi->rwsem);
3316         if (status != 0)
3317                 goto out;
3318         /* Is this a delegated lock? */
3319         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3320                 goto out;
3321         lsp = request->fl_u.nfs4_fl.owner;
3322         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3323         status = -ENOMEM;
3324         if (seqid == NULL)
3325                 goto out;
3326         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3327         status = PTR_ERR(task);
3328         if (IS_ERR(task))
3329                 goto out;
3330         status = nfs4_wait_for_completion_rpc_task(task);
3331         rpc_put_task(task);
3332 out:
3333         request->fl_flags = fl_flags;
3334         return status;
3335 }
3336
3337 struct nfs4_lockdata {
3338         struct nfs_lock_args arg;
3339         struct nfs_lock_res res;
3340         struct nfs4_lock_state *lsp;
3341         struct nfs_open_context *ctx;
3342         struct file_lock fl;
3343         unsigned long timestamp;
3344         int rpc_status;
3345         int cancelled;
3346 };
3347
3348 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3349                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3350 {
3351         struct nfs4_lockdata *p;
3352         struct inode *inode = lsp->ls_state->inode;
3353         struct nfs_server *server = NFS_SERVER(inode);
3354
3355         p = kzalloc(sizeof(*p), GFP_KERNEL);
3356         if (p == NULL)
3357                 return NULL;
3358
3359         p->arg.fh = NFS_FH(inode);
3360         p->arg.fl = &p->fl;
3361         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3362         if (p->arg.open_seqid == NULL)
3363                 goto out_free;
3364         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3365         if (p->arg.lock_seqid == NULL)
3366                 goto out_free_seqid;
3367         p->arg.lock_stateid = &lsp->ls_stateid;
3368         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3369         p->arg.lock_owner.id = lsp->ls_id.id;
3370         p->res.lock_seqid = p->arg.lock_seqid;
3371         p->lsp = lsp;
3372         atomic_inc(&lsp->ls_count);
3373         p->ctx = get_nfs_open_context(ctx);
3374         memcpy(&p->fl, fl, sizeof(p->fl));
3375         return p;
3376 out_free_seqid:
3377         nfs_free_seqid(p->arg.open_seqid);
3378 out_free:
3379         kfree(p);
3380         return NULL;
3381 }
3382
3383 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3384 {
3385         struct nfs4_lockdata *data = calldata;
3386         struct nfs4_state *state = data->lsp->ls_state;
3387
3388         dprintk("%s: begin!\n", __func__);
3389         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3390                 return;
3391         /* Do we need to do an open_to_lock_owner? */
3392         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3393                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3394                         return;
3395                 data->arg.open_stateid = &state->stateid;
3396                 data->arg.new_lock_owner = 1;
3397                 data->res.open_seqid = data->arg.open_seqid;
3398         } else
3399                 data->arg.new_lock_owner = 0;
3400         data->timestamp = jiffies;
3401         rpc_call_start(task);
3402         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3403 }
3404
3405 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3406 {
3407         struct nfs4_lockdata *data = calldata;
3408
3409         dprintk("%s: begin!\n", __func__);
3410
3411         data->rpc_status = task->tk_status;
3412         if (RPC_ASSASSINATED(task))
3413                 goto out;
3414         if (data->arg.new_lock_owner != 0) {
3415                 if (data->rpc_status == 0)
3416                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3417                 else
3418                         goto out;
3419         }
3420         if (data->rpc_status == 0) {
3421                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3422                                         sizeof(data->lsp->ls_stateid.data));
3423                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3424                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3425         }
3426 out:
3427         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3428 }
3429
3430 static void nfs4_lock_release(void *calldata)
3431 {
3432         struct nfs4_lockdata *data = calldata;
3433
3434         dprintk("%s: begin!\n", __func__);
3435         nfs_free_seqid(data->arg.open_seqid);
3436         if (data->cancelled != 0) {
3437                 struct rpc_task *task;
3438                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3439                                 data->arg.lock_seqid);
3440                 if (!IS_ERR(task))
3441                         rpc_put_task(task);
3442                 dprintk("%s: cancelling lock!\n", __func__);
3443         } else
3444                 nfs_free_seqid(data->arg.lock_seqid);
3445         nfs4_put_lock_state(data->lsp);
3446         put_nfs_open_context(data->ctx);
3447         kfree(data);
3448         dprintk("%s: done!\n", __func__);
3449 }
3450
3451 static const struct rpc_call_ops nfs4_lock_ops = {
3452         .rpc_call_prepare = nfs4_lock_prepare,
3453         .rpc_call_done = nfs4_lock_done,
3454         .rpc_release = nfs4_lock_release,
3455 };
3456
3457 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3458 {
3459         struct nfs4_lockdata *data;
3460         struct rpc_task *task;
3461         struct rpc_message msg = {
3462                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3463                 .rpc_cred = state->owner->so_cred,
3464         };
3465         struct rpc_task_setup task_setup_data = {
3466                 .rpc_client = NFS_CLIENT(state->inode),
3467                 .rpc_message = &msg,
3468                 .callback_ops = &nfs4_lock_ops,
3469                 .workqueue = nfsiod_workqueue,
3470                 .flags = RPC_TASK_ASYNC,
3471         };
3472         int ret;
3473
3474         dprintk("%s: begin!\n", __func__);
3475         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3476                         fl->fl_u.nfs4_fl.owner);
3477         if (data == NULL)
3478                 return -ENOMEM;
3479         if (IS_SETLKW(cmd))
3480                 data->arg.block = 1;
3481         if (reclaim != 0)
3482                 data->arg.reclaim = 1;
3483         msg.rpc_argp = &data->arg,
3484         msg.rpc_resp = &data->res,
3485         task_setup_data.callback_data = data;
3486         task = rpc_run_task(&task_setup_data);
3487         if (IS_ERR(task))
3488                 return PTR_ERR(task);
3489         ret = nfs4_wait_for_completion_rpc_task(task);
3490         if (ret == 0) {
3491                 ret = data->rpc_status;
3492                 if (ret == -NFS4ERR_DENIED)
3493                         ret = -EAGAIN;
3494         } else
3495                 data->cancelled = 1;
3496         rpc_put_task(task);
3497         dprintk("%s: done, ret = %d!\n", __func__, ret);
3498         return ret;
3499 }
3500
3501 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3502 {
3503         struct nfs_server *server = NFS_SERVER(state->inode);
3504         struct nfs4_exception exception = { };
3505         int err;
3506
3507         do {
3508                 /* Cache the lock if possible... */
3509                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3510                         return 0;
3511                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3512                 if (err != -NFS4ERR_DELAY)
3513                         break;
3514                 nfs4_handle_exception(server, err, &exception);
3515         } while (exception.retry);
3516         return err;
3517 }
3518
3519 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3520 {
3521         struct nfs_server *server = NFS_SERVER(state->inode);
3522         struct nfs4_exception exception = { };
3523         int err;
3524
3525         err = nfs4_set_lock_state(state, request);
3526         if (err != 0)
3527                 return err;
3528         do {
3529                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3530                         return 0;
3531                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3532                 if (err != -NFS4ERR_DELAY)
3533                         break;
3534                 nfs4_handle_exception(server, err, &exception);
3535         } while (exception.retry);
3536         return err;
3537 }
3538
3539 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3540 {
3541         struct nfs_inode *nfsi = NFS_I(state->inode);
3542         unsigned char fl_flags = request->fl_flags;
3543         int status;
3544
3545         /* Is this a delegated open? */
3546         status = nfs4_set_lock_state(state, request);
3547         if (status != 0)
3548                 goto out;
3549         request->fl_flags |= FL_ACCESS;
3550         status = do_vfs_lock(request->fl_file, request);
3551         if (status < 0)
3552                 goto out;
3553         down_read(&nfsi->rwsem);
3554         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3555                 /* Yes: cache locks! */
3556                 /* ...but avoid races with delegation recall... */
3557                 request->fl_flags = fl_flags & ~FL_SLEEP;
3558                 status = do_vfs_lock(request->fl_file, request);
3559                 goto out_unlock;
3560         }
3561         status = _nfs4_do_setlk(state, cmd, request, 0);
3562         if (status != 0)
3563                 goto out_unlock;
3564         /* Note: we always want to sleep here! */
3565         request->fl_flags = fl_flags | FL_SLEEP;
3566         if (do_vfs_lock(request->fl_file, request) < 0)
3567                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
3568 out_unlock:
3569         up_read(&nfsi->rwsem);
3570 out:
3571         request->fl_flags = fl_flags;
3572         return status;
3573 }
3574
3575 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3576 {
3577         struct nfs4_exception exception = { };
3578         int err;
3579
3580         do {
3581                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3582                                 _nfs4_proc_setlk(state, cmd, request),
3583                                 &exception);
3584         } while (exception.retry);
3585         return err;
3586 }
3587
3588 static int
3589 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3590 {
3591         struct nfs_open_context *ctx;
3592         struct nfs4_state *state;
3593         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3594         int status;
3595
3596         /* verify open state */
3597         ctx = nfs_file_open_context(filp);
3598         state = ctx->state;
3599
3600         if (request->fl_start < 0 || request->fl_end < 0)
3601                 return -EINVAL;
3602
3603         if (IS_GETLK(cmd))
3604                 return nfs4_proc_getlk(state, F_GETLK, request);
3605
3606         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3607                 return -EINVAL;
3608
3609         if (request->fl_type == F_UNLCK)
3610                 return nfs4_proc_unlck(state, cmd, request);
3611
3612         do {
3613                 status = nfs4_proc_setlk(state, cmd, request);
3614                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3615                         break;
3616                 timeout = nfs4_set_lock_task_retry(timeout);
3617                 status = -ERESTARTSYS;
3618                 if (signalled())
3619                         break;
3620         } while(status < 0);
3621         return status;
3622 }
3623
3624 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3625 {
3626         struct nfs_server *server = NFS_SERVER(state->inode);
3627         struct nfs4_exception exception = { };
3628         int err;
3629
3630         err = nfs4_set_lock_state(state, fl);
3631         if (err != 0)
3632                 goto out;
3633         do {
3634                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3635                 if (err != -NFS4ERR_DELAY)
3636                         break;
3637                 err = nfs4_handle_exception(server, err, &exception);
3638         } while (exception.retry);
3639 out:
3640         return err;
3641 }
3642
3643 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3644
3645 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3646                 size_t buflen, int flags)
3647 {
3648         struct inode *inode = dentry->d_inode;
3649
3650         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3651                 return -EOPNOTSUPP;
3652
3653         return nfs4_proc_set_acl(inode, buf, buflen);
3654 }
3655
3656 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3657  * and that's what we'll do for e.g. user attributes that haven't been set.
3658  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3659  * attributes in kernel-managed attribute namespaces. */
3660 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3661                 size_t buflen)
3662 {
3663         struct inode *inode = dentry->d_inode;
3664
3665         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3666                 return -EOPNOTSUPP;
3667
3668         return nfs4_proc_get_acl(inode, buf, buflen);
3669 }
3670
3671 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3672 {
3673         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3674
3675         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3676                 return 0;
3677         if (buf && buflen < len)
3678                 return -ERANGE;
3679         if (buf)
3680                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3681         return len;
3682 }
3683
3684 static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
3685 {
3686         if (!((fattr->valid & NFS_ATTR_FATTR_FILEID) &&
3687                 (fattr->valid & NFS_ATTR_FATTR_FSID) &&
3688                 (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
3689                 return;
3690
3691         fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
3692                 NFS_ATTR_FATTR_NLINK;
3693         fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
3694         fattr->nlink = 2;
3695 }
3696
3697 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3698                 struct nfs4_fs_locations *fs_locations, struct page *page)
3699 {
3700         struct nfs_server *server = NFS_SERVER(dir);
3701         u32 bitmask[2] = {
3702                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3703                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3704         };
3705         struct nfs4_fs_locations_arg args = {
3706                 .dir_fh = NFS_FH(dir),
3707                 .name = name,
3708                 .page = page,
3709                 .bitmask = bitmask,
3710         };
3711         struct rpc_message msg = {
3712                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3713                 .rpc_argp = &args,
3714                 .rpc_resp = fs_locations,
3715         };
3716         int status;
3717
3718         dprintk("%s: start\n", __func__);
3719         nfs_fattr_init(&fs_locations->fattr);
3720         fs_locations->server = server;
3721         fs_locations->nlocations = 0;
3722         status = rpc_call_sync(server->client, &msg, 0);
3723         nfs_fixup_referral_attributes(&fs_locations->fattr);
3724         dprintk("%s: returned status = %d\n", __func__, status);
3725         return status;
3726 }
3727
3728 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3729         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
3730         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,
3731         .recover_open   = nfs4_open_reclaim,
3732         .recover_lock   = nfs4_lock_reclaim,
3733 };
3734
3735 struct nfs4_state_recovery_ops nfs4_nograce_recovery_ops = {
3736         .owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
3737         .state_flag_bit = NFS_STATE_RECLAIM_NOGRACE,
3738         .recover_open   = nfs4_open_expired,
3739         .recover_lock   = nfs4_lock_expired,
3740 };
3741
3742 static const struct inode_operations nfs4_file_inode_operations = {
3743         .permission     = nfs_permission,
3744         .getattr        = nfs_getattr,
3745         .setattr        = nfs_setattr,
3746         .getxattr       = nfs4_getxattr,
3747         .setxattr       = nfs4_setxattr,
3748         .listxattr      = nfs4_listxattr,
3749 };
3750
3751 const struct nfs_rpc_ops nfs_v4_clientops = {
3752         .version        = 4,                    /* protocol version */
3753         .dentry_ops     = &nfs4_dentry_operations,
3754         .dir_inode_ops  = &nfs4_dir_inode_operations,
3755         .file_inode_ops = &nfs4_file_inode_operations,
3756         .getroot        = nfs4_proc_get_root,
3757         .getattr        = nfs4_proc_getattr,
3758         .setattr        = nfs4_proc_setattr,
3759         .lookupfh       = nfs4_proc_lookupfh,
3760         .lookup         = nfs4_proc_lookup,
3761         .access         = nfs4_proc_access,
3762         .readlink       = nfs4_proc_readlink,
3763         .create         = nfs4_proc_create,
3764         .remove         = nfs4_proc_remove,
3765         .unlink_setup   = nfs4_proc_unlink_setup,
3766         .unlink_done    = nfs4_proc_unlink_done,
3767         .rename         = nfs4_proc_rename,
3768         .link           = nfs4_proc_link,
3769         .symlink        = nfs4_proc_symlink,
3770         .mkdir          = nfs4_proc_mkdir,
3771         .rmdir          = nfs4_proc_remove,
3772         .readdir        = nfs4_proc_readdir,
3773         .mknod          = nfs4_proc_mknod,
3774         .statfs         = nfs4_proc_statfs,
3775         .fsinfo         = nfs4_proc_fsinfo,
3776         .pathconf       = nfs4_proc_pathconf,
3777         .set_capabilities = nfs4_server_capabilities,
3778         .decode_dirent  = nfs4_decode_dirent,
3779         .read_setup     = nfs4_proc_read_setup,
3780         .read_done      = nfs4_read_done,
3781         .write_setup    = nfs4_proc_write_setup,
3782         .write_done     = nfs4_write_done,
3783         .commit_setup   = nfs4_proc_commit_setup,
3784         .commit_done    = nfs4_commit_done,
3785         .lock           = nfs4_proc_lock,
3786         .clear_acl_cache = nfs4_zap_acl_attr,
3787 };
3788
3789 /*
3790  * Local variables:
3791  *  c-basic-offset: 8
3792  * End:
3793  */