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 *);
  66 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception);
  67 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp);
  68 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  69 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
  70
  71 /* Prevent leaks of NFSv4 errors into userland */
  72 int nfs4_map_errors(int err)
  73 {
  74         if (err < -1000) {
  75                 dprintk("%s could not handle NFSv4 error %d\n",
  76                                 __func__, -err);
  77                 return -EIO;
  78         }
  79         return err;
  80 }
  81
  82 /*
  83  * This is our standard bitmap for GETATTR requests.
  84  */
  85 const u32 nfs4_fattr_bitmap[2] = {
  86         FATTR4_WORD0_TYPE
  87         | FATTR4_WORD0_CHANGE
  88         | FATTR4_WORD0_SIZE
  89         | FATTR4_WORD0_FSID
  90         | FATTR4_WORD0_FILEID,
  91         FATTR4_WORD1_MODE
  92         | FATTR4_WORD1_NUMLINKS
  93         | FATTR4_WORD1_OWNER
  94         | FATTR4_WORD1_OWNER_GROUP
  95         | FATTR4_WORD1_RAWDEV
  96         | FATTR4_WORD1_SPACE_USED
  97         | FATTR4_WORD1_TIME_ACCESS
  98         | FATTR4_WORD1_TIME_METADATA
  99         | FATTR4_WORD1_TIME_MODIFY
 100 };
 101
 102 const u32 nfs4_statfs_bitmap[2] = {
 103         FATTR4_WORD0_FILES_AVAIL
 104         | FATTR4_WORD0_FILES_FREE
 105         | FATTR4_WORD0_FILES_TOTAL,
 106         FATTR4_WORD1_SPACE_AVAIL
 107         | FATTR4_WORD1_SPACE_FREE
 108         | FATTR4_WORD1_SPACE_TOTAL
 109 };
 110
 111 const u32 nfs4_pathconf_bitmap[2] = {
 112         FATTR4_WORD0_MAXLINK
 113         | FATTR4_WORD0_MAXNAME,
 114         0
 115 };
 116
 117 const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE
 118                         | FATTR4_WORD0_MAXREAD
 119                         | FATTR4_WORD0_MAXWRITE
 120                         | FATTR4_WORD0_LEASE_TIME,
 121                         0
 122 };
 123
 124 const u32 nfs4_fs_locations_bitmap[2] = {
 125         FATTR4_WORD0_TYPE
 126         | FATTR4_WORD0_CHANGE
 127         | FATTR4_WORD0_SIZE
 128         | FATTR4_WORD0_FSID
 129         | FATTR4_WORD0_FILEID
 130         | FATTR4_WORD0_FS_LOCATIONS,
 131         FATTR4_WORD1_MODE
 132         | FATTR4_WORD1_NUMLINKS
 133         | FATTR4_WORD1_OWNER
 134         | FATTR4_WORD1_OWNER_GROUP
 135         | FATTR4_WORD1_RAWDEV
 136         | FATTR4_WORD1_SPACE_USED
 137         | FATTR4_WORD1_TIME_ACCESS
 138         | FATTR4_WORD1_TIME_METADATA
 139         | FATTR4_WORD1_TIME_MODIFY
 140         | FATTR4_WORD1_MOUNTED_ON_FILEID
 141 };
 142
 143 static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
 144                 struct nfs4_readdir_arg *readdir)
 145 {
 146         __be32 *start, *p;
 147
 148         BUG_ON(readdir->count < 80);
 149         if (cookie > 2) {
 150                 readdir->cookie = cookie;
 151                 memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
 152                 return;
 153         }
 154
 155         readdir->cookie = 0;
 156         memset(&readdir->verifier, 0, sizeof(readdir->verifier));
 157         if (cookie == 2)
 158                 return;
 159
 160         /*
 161          * NFSv4 servers do not return entries for '.' and '..'
 162          * Therefore, we fake these entries here.  We let '.'
 163          * have cookie 0 and '..' have cookie 1.  Note that
 164          * when talking to the server, we always send cookie 0
 165          * instead of 1 or 2.
 166          */
 167         start = p = kmap_atomic(*readdir->pages, KM_USER0);
 168
 169         if (cookie == 0) {
 170                 *p++ = xdr_one;                                  /* next */
 171                 *p++ = xdr_zero;                   /* cookie, first word */
 172                 *p++ = xdr_one;                   /* cookie, second word */
 173                 *p++ = xdr_one;                             /* entry len */
 174                 memcpy(p, ".\0\0\0", 4);                        /* entry */
 175                 p++;
 176                 *p++ = xdr_one;                         /* bitmap length */
 177                 *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 178                 *p++ = htonl(8);              /* attribute buffer length */
 179                 p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_inode));
 180         }
 181
 182         *p++ = xdr_one;                                  /* next */
 183         *p++ = xdr_zero;                   /* cookie, first word */
 184         *p++ = xdr_two;                   /* cookie, second word */
 185         *p++ = xdr_two;                             /* entry len */
 186         memcpy(p, "..\0\0", 4);                         /* entry */
 187         p++;
 188         *p++ = xdr_one;                         /* bitmap length */
 189         *p++ = htonl(FATTR4_WORD0_FILEID);             /* bitmap */
 190         *p++ = htonl(8);              /* attribute buffer length */
 191         p = xdr_encode_hyper(p, NFS_FILEID(dentry->d_parent->d_inode));
 192
 193         readdir->pgbase = (char *)p - (char *)start;
 194         readdir->count -= readdir->pgbase;
 195         kunmap_atomic(start, KM_USER0);
 196 }
 197
 198 static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
 199 {
 200         struct nfs_client *clp = server->nfs_client;
 201         spin_lock(&clp->cl_lock);
 202         if (time_before(clp->cl_last_renewal,timestamp))
 203                 clp->cl_last_renewal = timestamp;
 204         spin_unlock(&clp->cl_lock);
 205 }
 206
 207 static void update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo)
 208 {
 209         struct nfs_inode *nfsi = NFS_I(dir);
 210
 211         spin_lock(&dir->i_lock);
 212         nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA;
 213         if (!cinfo->atomic || cinfo->before != nfsi->change_attr)
 214                 nfs_force_lookup_revalidate(dir);
 215         nfsi->change_attr = cinfo->after;
 216         spin_unlock(&dir->i_lock);
 217 }
 218
 219 struct nfs4_opendata {
 220         struct kref kref;
 221         struct nfs_openargs o_arg;
 222         struct nfs_openres o_res;
 223         struct nfs_open_confirmargs c_arg;
 224         struct nfs_open_confirmres c_res;
 225         struct nfs_fattr f_attr;
 226         struct nfs_fattr dir_attr;
 227         struct path path;
 228         struct dentry *dir;
 229         struct nfs4_state_owner *owner;
 230         struct nfs4_state *state;
 231         struct iattr attrs;
 232         unsigned long timestamp;
 233         unsigned int rpc_done : 1;
 234         int rpc_status;
 235         int cancelled;
 236 };
 237
 238
 239 static void nfs4_init_opendata_res(struct nfs4_opendata *p)
 240 {
 241         p->o_res.f_attr = &p->f_attr;
 242         p->o_res.dir_attr = &p->dir_attr;
 243         p->o_res.seqid = p->o_arg.seqid;
 244         p->c_res.seqid = p->c_arg.seqid;
 245         p->o_res.server = p->o_arg.server;
 246         nfs_fattr_init(&p->f_attr);
 247         nfs_fattr_init(&p->dir_attr);
 248 }
 249
 250 static struct nfs4_opendata *nfs4_opendata_alloc(struct path *path,
 251                 struct nfs4_state_owner *sp, int flags,
 252                 const struct iattr *attrs)
 253 {
 254         struct dentry *parent = dget_parent(path->dentry);
 255         struct inode *dir = parent->d_inode;
 256         struct nfs_server *server = NFS_SERVER(dir);
 257         struct nfs4_opendata *p;
 258
 259         p = kzalloc(sizeof(*p), GFP_KERNEL);
 260         if (p == NULL)
 261                 goto err;
 262         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 263         if (p->o_arg.seqid == NULL)
 264                 goto err_free;
 265         p->path.mnt = mntget(path->mnt);
 266         p->path.dentry = dget(path->dentry);
 267         p->dir = parent;
 268         p->owner = sp;
 269         atomic_inc(&sp->so_count);
 270         p->o_arg.fh = NFS_FH(dir);
 271         p->o_arg.open_flags = flags,
 272         p->o_arg.clientid = server->nfs_client->cl_clientid;
 273         p->o_arg.id = sp->so_owner_id.id;
 274         p->o_arg.name = &p->path.dentry->d_name;
 275         p->o_arg.server = server;
 276         p->o_arg.bitmask = server->attr_bitmask;
 277         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 278         if (flags & O_EXCL) {
 279                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 280                 s[0] = jiffies;
 281                 s[1] = current->pid;
 282         } else if (flags & O_CREAT) {
 283                 p->o_arg.u.attrs = &p->attrs;
 284                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 285         }
 286         p->c_arg.fh = &p->o_res.fh;
 287         p->c_arg.stateid = &p->o_res.stateid;
 288         p->c_arg.seqid = p->o_arg.seqid;
 289         nfs4_init_opendata_res(p);
 290         kref_init(&p->kref);
 291         return p;
 292 err_free:
 293         kfree(p);
 294 err:
 295         dput(parent);
 296         return NULL;
 297 }
 298
 299 static void nfs4_opendata_free(struct kref *kref)
 300 {
 301         struct nfs4_opendata *p = container_of(kref,
 302                         struct nfs4_opendata, kref);
 303
 304         nfs_free_seqid(p->o_arg.seqid);
 305         if (p->state != NULL)
 306                 nfs4_put_open_state(p->state);
 307         nfs4_put_state_owner(p->owner);
 308         dput(p->dir);
 309         path_put(&p->path);
 310         kfree(p);
 311 }
 312
 313 static void nfs4_opendata_put(struct nfs4_opendata *p)
 314 {
 315         if (p != NULL)
 316                 kref_put(&p->kref, nfs4_opendata_free);
 317 }
 318
 319 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 320 {
 321         int ret;
 322
 323         ret = rpc_wait_for_completion_task(task);
 324         return ret;
 325 }
 326
 327 static int can_open_cached(struct nfs4_state *state, int mode)
 328 {
 329         int ret = 0;
 330         switch (mode & (FMODE_READ|FMODE_WRITE|O_EXCL)) {
 331                 case FMODE_READ:
 332                         ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0;
 333                         break;
 334                 case FMODE_WRITE:
 335                         ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0;
 336                         break;
 337                 case FMODE_READ|FMODE_WRITE:
 338                         ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0;
 339         }
 340         return ret;
 341 }
 342
 343 static int can_open_delegated(struct nfs_delegation *delegation, mode_t open_flags)
 344 {
 345         if ((delegation->type & open_flags) != open_flags)
 346                 return 0;
 347         if (delegation->flags & NFS_DELEGATION_NEED_RECLAIM)
 348                 return 0;
 349         return 1;
 350 }
 351
 352 static void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 353 {
 354         switch (open_flags) {
 355                 case FMODE_WRITE:
 356                         state->n_wronly++;
 357                         break;
 358                 case FMODE_READ:
 359                         state->n_rdonly++;
 360                         break;
 361                 case FMODE_READ|FMODE_WRITE:
 362                         state->n_rdwr++;
 363         }
 364         nfs4_state_set_mode_locked(state, state->state | open_flags);
 365 }
 366
 367 static void nfs_set_open_stateid_locked(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 368 {
 369         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 370                 memcpy(state->stateid.data, stateid->data, sizeof(state->stateid.data));
 371         memcpy(state->open_stateid.data, stateid->data, sizeof(state->open_stateid.data));
 372         switch (open_flags) {
 373                 case FMODE_READ:
 374                         set_bit(NFS_O_RDONLY_STATE, &state->flags);
 375                         break;
 376                 case FMODE_WRITE:
 377                         set_bit(NFS_O_WRONLY_STATE, &state->flags);
 378                         break;
 379                 case FMODE_READ|FMODE_WRITE:
 380                         set_bit(NFS_O_RDWR_STATE, &state->flags);
 381         }
 382 }
 383
 384 static void nfs_set_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 385 {
 386         write_seqlock(&state->seqlock);
 387         nfs_set_open_stateid_locked(state, stateid, open_flags);
 388         write_sequnlock(&state->seqlock);
 389 }
 390
 391 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *open_stateid, nfs4_stateid *deleg_stateid, int open_flags)
 392 {
 393         open_flags &= (FMODE_READ|FMODE_WRITE);
 394         /*
 395          * Protect the call to nfs4_state_set_mode_locked and
 396          * serialise the stateid update
 397          */
 398         write_seqlock(&state->seqlock);
 399         if (deleg_stateid != NULL) {
 400                 memcpy(state->stateid.data, deleg_stateid->data, sizeof(state->stateid.data));
 401                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 402         }
 403         if (open_stateid != NULL)
 404                 nfs_set_open_stateid_locked(state, open_stateid, open_flags);
 405         write_sequnlock(&state->seqlock);
 406         spin_lock(&state->owner->so_lock);
 407         update_open_stateflags(state, open_flags);
 408         spin_unlock(&state->owner->so_lock);
 409 }
 410
 411 static void nfs4_return_incompatible_delegation(struct inode *inode, mode_t open_flags)
 412 {
 413         struct nfs_delegation *delegation;
 414
 415         rcu_read_lock();
 416         delegation = rcu_dereference(NFS_I(inode)->delegation);
 417         if (delegation == NULL || (delegation->type & open_flags) == open_flags) {
 418                 rcu_read_unlock();
 419                 return;
 420         }
 421         rcu_read_unlock();
 422         nfs_inode_return_delegation(inode);
 423 }
 424
 425 static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
 426 {
 427         struct nfs4_state *state = opendata->state;
 428         struct nfs_inode *nfsi = NFS_I(state->inode);
 429         struct nfs_delegation *delegation;
 430         int open_mode = opendata->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL);
 431         nfs4_stateid stateid;
 432         int ret = -EAGAIN;
 433
 434         rcu_read_lock();
 435         delegation = rcu_dereference(nfsi->delegation);
 436         for (;;) {
 437                 if (can_open_cached(state, open_mode)) {
 438                         spin_lock(&state->owner->so_lock);
 439                         if (can_open_cached(state, open_mode)) {
 440                                 update_open_stateflags(state, open_mode);
 441                                 spin_unlock(&state->owner->so_lock);
 442                                 rcu_read_unlock();
 443                                 goto out_return_state;
 444                         }
 445                         spin_unlock(&state->owner->so_lock);
 446                 }
 447                 if (delegation == NULL)
 448                         break;
 449                 if (!can_open_delegated(delegation, open_mode))
 450                         break;
 451                 /* Save the delegation */
 452                 memcpy(stateid.data, delegation->stateid.data, sizeof(stateid.data));
 453                 rcu_read_unlock();
 454                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 455                 if (ret != 0)
 456                         goto out;
 457                 ret = -EAGAIN;
 458                 rcu_read_lock();
 459                 delegation = rcu_dereference(nfsi->delegation);
 460                 /* If no delegation, try a cached open */
 461                 if (delegation == NULL)
 462                         continue;
 463                 /* Is the delegation still valid? */
 464                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 465                         continue;
 466                 rcu_read_unlock();
 467                 update_open_stateid(state, NULL, &stateid, open_mode);
 468                 goto out_return_state;
 469         }
 470         rcu_read_unlock();
 471 out:
 472         return ERR_PTR(ret);
 473 out_return_state:
 474         atomic_inc(&state->count);
 475         return state;
 476 }
 477
 478 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 479 {
 480         struct inode *inode;
 481         struct nfs4_state *state = NULL;
 482         struct nfs_delegation *delegation;
 483         nfs4_stateid *deleg_stateid = NULL;
 484         int ret;
 485
 486         if (!data->rpc_done) {
 487                 state = nfs4_try_open_cached(data);
 488                 goto out;
 489         }
 490
 491         ret = -EAGAIN;
 492         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 493                 goto err;
 494         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 495         ret = PTR_ERR(inode);
 496         if (IS_ERR(inode))
 497                 goto err;
 498         ret = -ENOMEM;
 499         state = nfs4_get_open_state(inode, data->owner);
 500         if (state == NULL)
 501                 goto err_put_inode;
 502         if (data->o_res.delegation_type != 0) {
 503                 int delegation_flags = 0;
 504
 505                 rcu_read_lock();
 506                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 507                 if (delegation)
 508                         delegation_flags = delegation->flags;
 509                 rcu_read_unlock();
 510                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 511                         nfs_inode_set_delegation(state->inode,
 512                                         data->owner->so_cred,
 513                                         &data->o_res);
 514                 else
 515                         nfs_inode_reclaim_delegation(state->inode,
 516                                         data->owner->so_cred,
 517                                         &data->o_res);
 518         }
 519         rcu_read_lock();
 520         delegation = rcu_dereference(NFS_I(inode)->delegation);
 521         if (delegation != NULL)
 522                 deleg_stateid = &delegation->stateid;
 523         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 524         rcu_read_unlock();
 525         iput(inode);
 526 out:
 527         return state;
 528 err_put_inode:
 529         iput(inode);
 530 err:
 531         return ERR_PTR(ret);
 532 }
 533
 534 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 535 {
 536         struct nfs_inode *nfsi = NFS_I(state->inode);
 537         struct nfs_open_context *ctx;
 538
 539         spin_lock(&state->inode->i_lock);
 540         list_for_each_entry(ctx, &nfsi->open_files, list) {
 541                 if (ctx->state != state)
 542                         continue;
 543                 get_nfs_open_context(ctx);
 544                 spin_unlock(&state->inode->i_lock);
 545                 return ctx;
 546         }
 547         spin_unlock(&state->inode->i_lock);
 548         return ERR_PTR(-ENOENT);
 549 }
 550
 551 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 552 {
 553         struct nfs4_opendata *opendata;
 554
 555         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 556         if (opendata == NULL)
 557                 return ERR_PTR(-ENOMEM);
 558         opendata->state = state;
 559         atomic_inc(&state->count);
 560         return opendata;
 561 }
 562
 563 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 564 {
 565         struct nfs4_state *newstate;
 566         int ret;
 567
 568         opendata->o_arg.open_flags = openflags;
 569         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 570         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 571         nfs4_init_opendata_res(opendata);
 572         ret = _nfs4_proc_open(opendata);
 573         if (ret != 0)
 574                 return ret;
 575         newstate = nfs4_opendata_to_nfs4_state(opendata);
 576         if (IS_ERR(newstate))
 577                 return PTR_ERR(newstate);
 578         nfs4_close_state(&opendata->path, newstate, openflags);
 579         *res = newstate;
 580         return 0;
 581 }
 582
 583 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 584 {
 585         struct nfs4_state *newstate;
 586         int ret;
 587
 588         /* memory barrier prior to reading state->n_* */
 589         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 590         smp_rmb();
 591         if (state->n_rdwr != 0) {
 592                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 593                 if (ret != 0)
 594                         return ret;
 595                 if (newstate != state)
 596                         return -ESTALE;
 597         }
 598         if (state->n_wronly != 0) {
 599                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 600                 if (ret != 0)
 601                         return ret;
 602                 if (newstate != state)
 603                         return -ESTALE;
 604         }
 605         if (state->n_rdonly != 0) {
 606                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 607                 if (ret != 0)
 608                         return ret;
 609                 if (newstate != state)
 610                         return -ESTALE;
 611         }
 612         /*
 613          * We may have performed cached opens for all three recoveries.
 614          * Check if we need to update the current stateid.
 615          */
 616         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 617             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 618                 write_seqlock(&state->seqlock);
 619                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 620                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 621                 write_sequnlock(&state->seqlock);
 622         }
 623         return 0;
 624 }
 625
 626 /*
 627  * OPEN_RECLAIM:
 628  *      reclaim state on the server after a reboot.
 629  */
 630 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 631 {
 632         struct nfs_delegation *delegation;
 633         struct nfs4_opendata *opendata;
 634         int delegation_type = 0;
 635         int status;
 636
 637         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 638         if (IS_ERR(opendata))
 639                 return PTR_ERR(opendata);
 640         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 641         opendata->o_arg.fh = NFS_FH(state->inode);
 642         rcu_read_lock();
 643         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 644         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 645                 delegation_type = delegation->type;
 646         rcu_read_unlock();
 647         opendata->o_arg.u.delegation_type = delegation_type;
 648         status = nfs4_open_recover(opendata, state);
 649         nfs4_opendata_put(opendata);
 650         return status;
 651 }
 652
 653 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 654 {
 655         struct nfs_server *server = NFS_SERVER(state->inode);
 656         struct nfs4_exception exception = { };
 657         int err;
 658         do {
 659                 err = _nfs4_do_open_reclaim(ctx, state);
 660                 if (err != -NFS4ERR_DELAY)
 661                         break;
 662                 nfs4_handle_exception(server, err, &exception);
 663         } while (exception.retry);
 664         return err;
 665 }
 666
 667 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 668 {
 669         struct nfs_open_context *ctx;
 670         int ret;
 671
 672         ctx = nfs4_state_find_open_context(state);
 673         if (IS_ERR(ctx))
 674                 return PTR_ERR(ctx);
 675         ret = nfs4_do_open_reclaim(ctx, state);
 676         put_nfs_open_context(ctx);
 677         return ret;
 678 }
 679
 680 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 681 {
 682         struct nfs4_opendata *opendata;
 683         int ret;
 684
 685         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 686         if (IS_ERR(opendata))
 687                 return PTR_ERR(opendata);
 688         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 689         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 690                         sizeof(opendata->o_arg.u.delegation.data));
 691         ret = nfs4_open_recover(opendata, state);
 692         nfs4_opendata_put(opendata);
 693         return ret;
 694 }
 695
 696 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 697 {
 698         struct nfs4_exception exception = { };
 699         struct nfs_server *server = NFS_SERVER(state->inode);
 700         int err;
 701         do {
 702                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 703                 switch (err) {
 704                         case 0:
 705                                 return err;
 706                         case -NFS4ERR_STALE_CLIENTID:
 707                         case -NFS4ERR_STALE_STATEID:
 708                         case -NFS4ERR_EXPIRED:
 709                                 /* Don't recall a delegation if it was lost */
 710                                 nfs4_schedule_state_recovery(server->nfs_client);
 711                                 return err;
 712                 }
 713                 err = nfs4_handle_exception(server, err, &exception);
 714         } while (exception.retry);
 715         return err;
 716 }
 717
 718 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 719 {
 720         struct nfs4_opendata *data = calldata;
 721
 722         data->rpc_status = task->tk_status;
 723         if (RPC_ASSASSINATED(task))
 724                 return;
 725         if (data->rpc_status == 0) {
 726                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 727                                 sizeof(data->o_res.stateid.data));
 728                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
 729                 renew_lease(data->o_res.server, data->timestamp);
 730                 data->rpc_done = 1;
 731         }
 732 }
 733
 734 static void nfs4_open_confirm_release(void *calldata)
 735 {
 736         struct nfs4_opendata *data = calldata;
 737         struct nfs4_state *state = NULL;
 738
 739         /* If this request hasn't been cancelled, do nothing */
 740         if (data->cancelled == 0)
 741                 goto out_free;
 742         /* In case of error, no cleanup! */
 743         if (!data->rpc_done)
 744                 goto out_free;
 745         state = nfs4_opendata_to_nfs4_state(data);
 746         if (!IS_ERR(state))
 747                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 748 out_free:
 749         nfs4_opendata_put(data);
 750 }
 751
 752 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 753         .rpc_call_done = nfs4_open_confirm_done,
 754         .rpc_release = nfs4_open_confirm_release,
 755 };
 756
 757 /*
 758  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 759  */
 760 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 761 {
 762         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 763         struct rpc_task *task;
 764         struct  rpc_message msg = {
 765                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 766                 .rpc_argp = &data->c_arg,
 767                 .rpc_resp = &data->c_res,
 768                 .rpc_cred = data->owner->so_cred,
 769         };
 770         struct rpc_task_setup task_setup_data = {
 771                 .rpc_client = server->client,
 772                 .rpc_message = &msg,
 773                 .callback_ops = &nfs4_open_confirm_ops,
 774                 .callback_data = data,
 775                 .workqueue = nfsiod_workqueue,
 776                 .flags = RPC_TASK_ASYNC,
 777         };
 778         int status;
 779
 780         kref_get(&data->kref);
 781         data->rpc_done = 0;
 782         data->rpc_status = 0;
 783         data->timestamp = jiffies;
 784         task = rpc_run_task(&task_setup_data);
 785         if (IS_ERR(task))
 786                 return PTR_ERR(task);
 787         status = nfs4_wait_for_completion_rpc_task(task);
 788         if (status != 0) {
 789                 data->cancelled = 1;
 790                 smp_wmb();
 791         } else
 792                 status = data->rpc_status;
 793         rpc_put_task(task);
 794         return status;
 795 }
 796
 797 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 798 {
 799         struct nfs4_opendata *data = calldata;
 800         struct nfs4_state_owner *sp = data->owner;
 801
 802         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 803                 return;
 804         /*
 805          * Check if we still need to send an OPEN call, or if we can use
 806          * a delegation instead.
 807          */
 808         if (data->state != NULL) {
 809                 struct nfs_delegation *delegation;
 810
 811                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 812                         goto out_no_action;
 813                 rcu_read_lock();
 814                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 815                 if (delegation != NULL &&
 816                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 817                         rcu_read_unlock();
 818                         goto out_no_action;
 819                 }
 820                 rcu_read_unlock();
 821         }
 822         /* Update sequence id. */
 823         data->o_arg.id = sp->so_owner_id.id;
 824         data->o_arg.clientid = sp->so_client->cl_clientid;
 825         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 826                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 827                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 828         }
 829         data->timestamp = jiffies;
 830         rpc_call_start(task);
 831         return;
 832 out_no_action:
 833         task->tk_action = NULL;
 834
 835 }
 836
 837 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 838 {
 839         struct nfs4_opendata *data = calldata;
 840
 841         data->rpc_status = task->tk_status;
 842         if (RPC_ASSASSINATED(task))
 843                 return;
 844         if (task->tk_status == 0) {
 845                 switch (data->o_res.f_attr->mode & S_IFMT) {
 846                         case S_IFREG:
 847                                 break;
 848                         case S_IFLNK:
 849                                 data->rpc_status = -ELOOP;
 850                                 break;
 851                         case S_IFDIR:
 852                                 data->rpc_status = -EISDIR;
 853                                 break;
 854                         default:
 855                                 data->rpc_status = -ENOTDIR;
 856                 }
 857                 renew_lease(data->o_res.server, data->timestamp);
 858                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 859                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 860         }
 861         data->rpc_done = 1;
 862 }
 863
 864 static void nfs4_open_release(void *calldata)
 865 {
 866         struct nfs4_opendata *data = calldata;
 867         struct nfs4_state *state = NULL;
 868
 869         /* If this request hasn't been cancelled, do nothing */
 870         if (data->cancelled == 0)
 871                 goto out_free;
 872         /* In case of error, no cleanup! */
 873         if (data->rpc_status != 0 || !data->rpc_done)
 874                 goto out_free;
 875         /* In case we need an open_confirm, no cleanup! */
 876         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 877                 goto out_free;
 878         state = nfs4_opendata_to_nfs4_state(data);
 879         if (!IS_ERR(state))
 880                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 881 out_free:
 882         nfs4_opendata_put(data);
 883 }
 884
 885 static const struct rpc_call_ops nfs4_open_ops = {
 886         .rpc_call_prepare = nfs4_open_prepare,
 887         .rpc_call_done = nfs4_open_done,
 888         .rpc_release = nfs4_open_release,
 889 };
 890
 891 /*
 892  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 893  */
 894 static int _nfs4_proc_open(struct nfs4_opendata *data)
 895 {
 896         struct inode *dir = data->dir->d_inode;
 897         struct nfs_server *server = NFS_SERVER(dir);
 898         struct nfs_openargs *o_arg = &data->o_arg;
 899         struct nfs_openres *o_res = &data->o_res;
 900         struct rpc_task *task;
 901         struct rpc_message msg = {
 902                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 903                 .rpc_argp = o_arg,
 904                 .rpc_resp = o_res,
 905                 .rpc_cred = data->owner->so_cred,
 906         };
 907         struct rpc_task_setup task_setup_data = {
 908                 .rpc_client = server->client,
 909                 .rpc_message = &msg,
 910                 .callback_ops = &nfs4_open_ops,
 911                 .callback_data = data,
 912                 .workqueue = nfsiod_workqueue,
 913                 .flags = RPC_TASK_ASYNC,
 914         };
 915         int status;
 916
 917         kref_get(&data->kref);
 918         data->rpc_done = 0;
 919         data->rpc_status = 0;
 920         data->cancelled = 0;
 921         task = rpc_run_task(&task_setup_data);
 922         if (IS_ERR(task))
 923                 return PTR_ERR(task);
 924         status = nfs4_wait_for_completion_rpc_task(task);
 925         if (status != 0) {
 926                 data->cancelled = 1;
 927                 smp_wmb();
 928         } else
 929                 status = data->rpc_status;
 930         rpc_put_task(task);
 931         if (status != 0 || !data->rpc_done)
 932                 return status;
 933
 934         if (o_res->fh.size == 0)
 935                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 936
 937         if (o_arg->open_flags & O_CREAT) {
 938                 update_changeattr(dir, &o_res->cinfo);
 939                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 940         } else
 941                 nfs_refresh_inode(dir, o_res->dir_attr);
 942         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 943                 status = _nfs4_proc_open_confirm(data);
 944                 if (status != 0)
 945                         return status;
 946         }
 947         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 948                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 949         return 0;
 950 }
 951
 952 static int nfs4_recover_expired_lease(struct nfs_server *server)
 953 {
 954         struct nfs_client *clp = server->nfs_client;
 955         int ret;
 956
 957         for (;;) {
 958                 ret = nfs4_wait_clnt_recover(server->client, clp);
 959                 if (ret != 0)
 960                         return ret;
 961                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 962                         break;
 963                 nfs4_schedule_state_recovery(clp);
 964         }
 965         return 0;
 966 }
 967
 968 /*
 969  * OPEN_EXPIRED:
 970  *      reclaim state on the server after a network partition.
 971  *      Assumes caller holds the appropriate lock
 972  */
 973 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 974 {
 975         struct nfs4_opendata *opendata;
 976         int ret;
 977
 978         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 979         if (IS_ERR(opendata))
 980                 return PTR_ERR(opendata);
 981         ret = nfs4_open_recover(opendata, state);
 982         if (ret == -ESTALE)
 983                 d_drop(ctx->path.dentry);
 984         nfs4_opendata_put(opendata);
 985         return ret;
 986 }
 987
 988 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 989 {
 990         struct nfs_server *server = NFS_SERVER(state->inode);
 991         struct nfs4_exception exception = { };
 992         int err;
 993
 994         do {
 995                 err = _nfs4_open_expired(ctx, state);
 996                 if (err == -NFS4ERR_DELAY)
 997                         nfs4_handle_exception(server, err, &exception);
 998         } while (exception.retry);
 999         return err;
1000 }
1001
1002 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1003 {
1004         struct nfs_open_context *ctx;
1005         int ret;
1006
1007         ctx = nfs4_state_find_open_context(state);
1008         if (IS_ERR(ctx))
1009                 return PTR_ERR(ctx);
1010         ret = nfs4_do_open_expired(ctx, state);
1011         put_nfs_open_context(ctx);
1012         return ret;
1013 }
1014
1015 /*
1016  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1017  * fields corresponding to attributes that were used to store the verifier.
1018  * Make sure we clobber those fields in the later setattr call
1019  */
1020 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1021 {
1022         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1023             !(sattr->ia_valid & ATTR_ATIME_SET))
1024                 sattr->ia_valid |= ATTR_ATIME;
1025
1026         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1027             !(sattr->ia_valid & ATTR_MTIME_SET))
1028                 sattr->ia_valid |= ATTR_MTIME;
1029 }
1030
1031 /*
1032  * Returns a referenced nfs4_state
1033  */
1034 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1035 {
1036         struct nfs4_state_owner  *sp;
1037         struct nfs4_state     *state = NULL;
1038         struct nfs_server       *server = NFS_SERVER(dir);
1039         struct nfs_client *clp = server->nfs_client;
1040         struct nfs4_opendata *opendata;
1041         int status;
1042
1043         /* Protect against reboot recovery conflicts */
1044         status = -ENOMEM;
1045         if (!(sp = nfs4_get_state_owner(server, cred))) {
1046                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1047                 goto out_err;
1048         }
1049         status = nfs4_recover_expired_lease(server);
1050         if (status != 0)
1051                 goto err_put_state_owner;
1052         if (path->dentry->d_inode != NULL)
1053                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1054         down_read(&clp->cl_sem);
1055         status = -ENOMEM;
1056         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1057         if (opendata == NULL)
1058                 goto err_release_rwsem;
1059
1060         if (path->dentry->d_inode != NULL)
1061                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1062
1063         status = _nfs4_proc_open(opendata);
1064         if (status != 0)
1065                 goto err_opendata_put;
1066
1067         if (opendata->o_arg.open_flags & O_EXCL)
1068                 nfs4_exclusive_attrset(opendata, sattr);
1069
1070         state = nfs4_opendata_to_nfs4_state(opendata);
1071         status = PTR_ERR(state);
1072         if (IS_ERR(state))
1073                 goto err_opendata_put;
1074         nfs4_opendata_put(opendata);
1075         nfs4_put_state_owner(sp);
1076         up_read(&clp->cl_sem);
1077         *res = state;
1078         return 0;
1079 err_opendata_put:
1080         nfs4_opendata_put(opendata);
1081 err_release_rwsem:
1082         up_read(&clp->cl_sem);
1083 err_put_state_owner:
1084         nfs4_put_state_owner(sp);
1085 out_err:
1086         *res = NULL;
1087         return status;
1088 }
1089
1090
1091 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1092 {
1093         struct nfs4_exception exception = { };
1094         struct nfs4_state *res;
1095         int status;
1096
1097         do {
1098                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1099                 if (status == 0)
1100                         break;
1101                 /* NOTE: BAD_SEQID means the server and client disagree about the
1102                  * book-keeping w.r.t. state-changing operations
1103                  * (OPEN/CLOSE/LOCK/LOCKU...)
1104                  * It is actually a sign of a bug on the client or on the server.
1105                  *
1106                  * If we receive a BAD_SEQID error in the particular case of
1107                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1108                  * have unhashed the old state_owner for us, and that we can
1109                  * therefore safely retry using a new one. We should still warn
1110                  * the user though...
1111                  */
1112                 if (status == -NFS4ERR_BAD_SEQID) {
1113                         printk(KERN_WARNING "NFS: v4 server %s "
1114                                         " returned a bad sequence-id error!\n",
1115                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1116                         exception.retry = 1;
1117                         continue;
1118                 }
1119                 /*
1120                  * BAD_STATEID on OPEN means that the server cancelled our
1121                  * state before it received the OPEN_CONFIRM.
1122                  * Recover by retrying the request as per the discussion
1123                  * on Page 181 of RFC3530.
1124                  */
1125                 if (status == -NFS4ERR_BAD_STATEID) {
1126                         exception.retry = 1;
1127                         continue;
1128                 }
1129                 if (status == -EAGAIN) {
1130                         /* We must have found a delegation */
1131                         exception.retry = 1;
1132                         continue;
1133                 }
1134                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1135                                         status, &exception));
1136         } while (exception.retry);
1137         return res;
1138 }
1139
1140 static int _nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1141                             struct nfs_fattr *fattr, struct iattr *sattr,
1142                             struct nfs4_state *state)
1143 {
1144         struct nfs_server *server = NFS_SERVER(inode);
1145         struct nfs_setattrargs  arg = {
1146                 .fh             = NFS_FH(inode),
1147                 .iap            = sattr,
1148                 .server         = server,
1149                 .bitmask = server->attr_bitmask,
1150         };
1151         struct nfs_setattrres  res = {
1152                 .fattr          = fattr,
1153                 .server         = server,
1154         };
1155         struct rpc_message msg = {
1156                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1157                 .rpc_argp       = &arg,
1158                 .rpc_resp       = &res,
1159                 .rpc_cred       = cred,
1160         };
1161         unsigned long timestamp = jiffies;
1162         int status;
1163
1164         nfs_fattr_init(fattr);
1165
1166         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1167                 /* Use that stateid */
1168         } else if (state != NULL) {
1169                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1170         } else
1171                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1172
1173         status = rpc_call_sync(server->client, &msg, 0);
1174         if (status == 0 && state != NULL)
1175                 renew_lease(server, timestamp);
1176         return status;
1177 }
1178
1179 static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
1180                            struct nfs_fattr *fattr, struct iattr *sattr,
1181                            struct nfs4_state *state)
1182 {
1183         struct nfs_server *server = NFS_SERVER(inode);
1184         struct nfs4_exception exception = { };
1185         int err;
1186         do {
1187                 err = nfs4_handle_exception(server,
1188                                 _nfs4_do_setattr(inode, cred, fattr, sattr, state),
1189                                 &exception);
1190         } while (exception.retry);
1191         return err;
1192 }
1193
1194 struct nfs4_closedata {
1195         struct path path;
1196         struct inode *inode;
1197         struct nfs4_state *state;
1198         struct nfs_closeargs arg;
1199         struct nfs_closeres res;
1200         struct nfs_fattr fattr;
1201         unsigned long timestamp;
1202 };
1203
1204 static void nfs4_free_closedata(void *data)
1205 {
1206         struct nfs4_closedata *calldata = data;
1207         struct nfs4_state_owner *sp = calldata->state->owner;
1208
1209         nfs4_put_open_state(calldata->state);
1210         nfs_free_seqid(calldata->arg.seqid);
1211         nfs4_put_state_owner(sp);
1212         path_put(&calldata->path);
1213         kfree(calldata);
1214 }
1215
1216 static void nfs4_close_done(struct rpc_task *task, void *data)
1217 {
1218         struct nfs4_closedata *calldata = data;
1219         struct nfs4_state *state = calldata->state;
1220         struct nfs_server *server = NFS_SERVER(calldata->inode);
1221
1222         if (RPC_ASSASSINATED(task))
1223                 return;
1224         /* hmm. we are done with the inode, and in the process of freeing
1225          * the state_owner. we keep this around to process errors
1226          */
1227         switch (task->tk_status) {
1228                 case 0:
1229                         nfs_set_open_stateid(state, &calldata->res.stateid, 0);
1230                         renew_lease(server, calldata->timestamp);
1231                         break;
1232                 case -NFS4ERR_STALE_STATEID:
1233                 case -NFS4ERR_EXPIRED:
1234                         break;
1235                 default:
1236                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1237                                 rpc_restart_call(task);
1238                                 return;
1239                         }
1240         }
1241         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1242 }
1243
1244 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1245 {
1246         struct nfs4_closedata *calldata = data;
1247         struct nfs4_state *state = calldata->state;
1248         int clear_rd, clear_wr, clear_rdwr;
1249
1250         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1251                 return;
1252
1253         clear_rd = clear_wr = clear_rdwr = 0;
1254         spin_lock(&state->owner->so_lock);
1255         /* Calculate the change in open mode */
1256         if (state->n_rdwr == 0) {
1257                 if (state->n_rdonly == 0) {
1258                         clear_rd |= test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags);
1259                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1260                 }
1261                 if (state->n_wronly == 0) {
1262                         clear_wr |= test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags);
1263                         clear_rdwr |= test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags);
1264                 }
1265         }
1266         spin_unlock(&state->owner->so_lock);
1267         if (!clear_rd && !clear_wr && !clear_rdwr) {
1268                 /* Note: exit _without_ calling nfs4_close_done */
1269                 task->tk_action = NULL;
1270                 return;
1271         }
1272         nfs_fattr_init(calldata->res.fattr);
1273         if (test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0) {
1274                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1275                 calldata->arg.open_flags = FMODE_READ;
1276         } else if (test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0) {
1277                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1278                 calldata->arg.open_flags = FMODE_WRITE;
1279         }
1280         calldata->timestamp = jiffies;
1281         rpc_call_start(task);
1282 }
1283
1284 static const struct rpc_call_ops nfs4_close_ops = {
1285         .rpc_call_prepare = nfs4_close_prepare,
1286         .rpc_call_done = nfs4_close_done,
1287         .rpc_release = nfs4_free_closedata,
1288 };
1289
1290 /*
1291  * It is possible for data to be read/written from a mem-mapped file
1292  * after the sys_close call (which hits the vfs layer as a flush).
1293  * This means that we can't safely call nfsv4 close on a file until
1294  * the inode is cleared. This in turn means that we are not good
1295  * NFSv4 citizens - we do not indicate to the server to update the file's
1296  * share state even when we are done with one of the three share
1297  * stateid's in the inode.
1298  *
1299  * NOTE: Caller must be holding the sp->so_owner semaphore!
1300  */
1301 int nfs4_do_close(struct path *path, struct nfs4_state *state, int wait)
1302 {
1303         struct nfs_server *server = NFS_SERVER(state->inode);
1304         struct nfs4_closedata *calldata;
1305         struct nfs4_state_owner *sp = state->owner;
1306         struct rpc_task *task;
1307         struct rpc_message msg = {
1308                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1309                 .rpc_cred = state->owner->so_cred,
1310         };
1311         struct rpc_task_setup task_setup_data = {
1312                 .rpc_client = server->client,
1313                 .rpc_message = &msg,
1314                 .callback_ops = &nfs4_close_ops,
1315                 .workqueue = nfsiod_workqueue,
1316                 .flags = RPC_TASK_ASYNC,
1317         };
1318         int status = -ENOMEM;
1319
1320         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1321         if (calldata == NULL)
1322                 goto out;
1323         calldata->inode = state->inode;
1324         calldata->state = state;
1325         calldata->arg.fh = NFS_FH(state->inode);
1326         calldata->arg.stateid = &state->open_stateid;
1327         /* Serialization for the sequence id */
1328         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1329         if (calldata->arg.seqid == NULL)
1330                 goto out_free_calldata;
1331         calldata->arg.bitmask = server->attr_bitmask;
1332         calldata->res.fattr = &calldata->fattr;
1333         calldata->res.seqid = calldata->arg.seqid;
1334         calldata->res.server = server;
1335         calldata->path.mnt = mntget(path->mnt);
1336         calldata->path.dentry = dget(path->dentry);
1337
1338         msg.rpc_argp = &calldata->arg,
1339         msg.rpc_resp = &calldata->res,
1340         task_setup_data.callback_data = calldata;
1341         task = rpc_run_task(&task_setup_data);
1342         if (IS_ERR(task))
1343                 return PTR_ERR(task);
1344         status = 0;
1345         if (wait)
1346                 status = rpc_wait_for_completion_task(task);
1347         rpc_put_task(task);
1348         return status;
1349 out_free_calldata:
1350         kfree(calldata);
1351 out:
1352         nfs4_put_open_state(state);
1353         nfs4_put_state_owner(sp);
1354         return status;
1355 }
1356
1357 static int nfs4_intent_set_file(struct nameidata *nd, struct path *path, struct nfs4_state *state)
1358 {
1359         struct file *filp;
1360         int ret;
1361
1362         /* If the open_intent is for execute, we have an extra check to make */
1363         if (nd->intent.open.flags & FMODE_EXEC) {
1364                 ret = nfs_may_open(state->inode,
1365                                 state->owner->so_cred,
1366                                 nd->intent.open.flags);
1367                 if (ret < 0)
1368                         goto out_close;
1369         }
1370         filp = lookup_instantiate_filp(nd, path->dentry, NULL);
1371         if (!IS_ERR(filp)) {
1372                 struct nfs_open_context *ctx;
1373                 ctx = nfs_file_open_context(filp);
1374                 ctx->state = state;
1375                 return 0;
1376         }
1377         ret = PTR_ERR(filp);
1378 out_close:
1379         nfs4_close_sync(path, state, nd->intent.open.flags);
1380         return ret;
1381 }
1382
1383 struct dentry *
1384 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1385 {
1386         struct path path = {
1387                 .mnt = nd->path.mnt,
1388                 .dentry = dentry,
1389         };
1390         struct dentry *parent;
1391         struct iattr attr;
1392         struct rpc_cred *cred;
1393         struct nfs4_state *state;
1394         struct dentry *res;
1395
1396         if (nd->flags & LOOKUP_CREATE) {
1397                 attr.ia_mode = nd->intent.open.create_mode;
1398                 attr.ia_valid = ATTR_MODE;
1399                 if (!IS_POSIXACL(dir))
1400                         attr.ia_mode &= ~current->fs->umask;
1401         } else {
1402                 attr.ia_valid = 0;
1403                 BUG_ON(nd->intent.open.flags & O_CREAT);
1404         }
1405
1406         cred = rpc_lookup_cred();
1407         if (IS_ERR(cred))
1408                 return (struct dentry *)cred;
1409         parent = dentry->d_parent;
1410         /* Protect against concurrent sillydeletes */
1411         nfs_block_sillyrename(parent);
1412         state = nfs4_do_open(dir, &path, nd->intent.open.flags, &attr, cred);
1413         put_rpccred(cred);
1414         if (IS_ERR(state)) {
1415                 if (PTR_ERR(state) == -ENOENT) {
1416                         d_add(dentry, NULL);
1417                         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1418                 }
1419                 nfs_unblock_sillyrename(parent);
1420                 return (struct dentry *)state;
1421         }
1422         res = d_add_unique(dentry, igrab(state->inode));
1423         if (res != NULL)
1424                 path.dentry = res;
1425         nfs_set_verifier(path.dentry, nfs_save_change_attribute(dir));
1426         nfs_unblock_sillyrename(parent);
1427         nfs4_intent_set_file(nd, &path, state);
1428         return res;
1429 }
1430
1431 int
1432 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1433 {
1434         struct path path = {
1435                 .mnt = nd->path.mnt,
1436                 .dentry = dentry,
1437         };
1438         struct rpc_cred *cred;
1439         struct nfs4_state *state;
1440
1441         cred = rpc_lookup_cred();
1442         if (IS_ERR(cred))
1443                 return PTR_ERR(cred);
1444         state = nfs4_do_open(dir, &path, openflags, NULL, cred);
1445         put_rpccred(cred);
1446         if (IS_ERR(state)) {
1447                 switch (PTR_ERR(state)) {
1448                         case -EPERM:
1449                         case -EACCES:
1450                         case -EDQUOT:
1451                         case -ENOSPC:
1452                         case -EROFS:
1453                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1454                                 return 1;
1455                         default:
1456                                 goto out_drop;
1457                 }
1458         }
1459         if (state->inode == dentry->d_inode) {
1460                 nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1461                 nfs4_intent_set_file(nd, &path, state);
1462                 return 1;
1463         }
1464         nfs4_close_sync(&path, state, openflags);
1465 out_drop:
1466         d_drop(dentry);
1467         return 0;
1468 }
1469
1470
1471 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1472 {
1473         struct nfs4_server_caps_res res = {};
1474         struct rpc_message msg = {
1475                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1476                 .rpc_argp = fhandle,
1477                 .rpc_resp = &res,
1478         };
1479         int status;
1480
1481         status = rpc_call_sync(server->client, &msg, 0);
1482         if (status == 0) {
1483                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1484                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1485                         server->caps |= NFS_CAP_ACLS;
1486                 if (res.has_links != 0)
1487                         server->caps |= NFS_CAP_HARDLINKS;
1488                 if (res.has_symlinks != 0)
1489                         server->caps |= NFS_CAP_SYMLINKS;
1490                 server->acl_bitmask = res.acl_bitmask;
1491         }
1492         return status;
1493 }
1494
1495 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1496 {
1497         struct nfs4_exception exception = { };
1498         int err;
1499         do {
1500                 err = nfs4_handle_exception(server,
1501                                 _nfs4_server_capabilities(server, fhandle),
1502                                 &exception);
1503         } while (exception.retry);
1504         return err;
1505 }
1506
1507 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1508                 struct nfs_fsinfo *info)
1509 {
1510         struct nfs4_lookup_root_arg args = {
1511                 .bitmask = nfs4_fattr_bitmap,
1512         };
1513         struct nfs4_lookup_res res = {
1514                 .server = server,
1515                 .fattr = info->fattr,
1516                 .fh = fhandle,
1517         };
1518         struct rpc_message msg = {
1519                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1520                 .rpc_argp = &args,
1521                 .rpc_resp = &res,
1522         };
1523         nfs_fattr_init(info->fattr);
1524         return rpc_call_sync(server->client, &msg, 0);
1525 }
1526
1527 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1528                 struct nfs_fsinfo *info)
1529 {
1530         struct nfs4_exception exception = { };
1531         int err;
1532         do {
1533                 err = nfs4_handle_exception(server,
1534                                 _nfs4_lookup_root(server, fhandle, info),
1535                                 &exception);
1536         } while (exception.retry);
1537         return err;
1538 }
1539
1540 /*
1541  * get the file handle for the "/" directory on the server
1542  */
1543 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1544                               struct nfs_fsinfo *info)
1545 {
1546         int status;
1547
1548         status = nfs4_lookup_root(server, fhandle, info);
1549         if (status == 0)
1550                 status = nfs4_server_capabilities(server, fhandle);
1551         if (status == 0)
1552                 status = nfs4_do_fsinfo(server, fhandle, info);
1553         return nfs4_map_errors(status);
1554 }
1555
1556 /*
1557  * Get locations and (maybe) other attributes of a referral.
1558  * Note that we'll actually follow the referral later when
1559  * we detect fsid mismatch in inode revalidation
1560  */
1561 static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1562 {
1563         int status = -ENOMEM;
1564         struct page *page = NULL;
1565         struct nfs4_fs_locations *locations = NULL;
1566
1567         page = alloc_page(GFP_KERNEL);
1568         if (page == NULL)
1569                 goto out;
1570         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1571         if (locations == NULL)
1572                 goto out;
1573
1574         status = nfs4_proc_fs_locations(dir, name, locations, page);
1575         if (status != 0)
1576                 goto out;
1577         /* Make sure server returned a different fsid for the referral */
1578         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1579                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
1580                 status = -EIO;
1581                 goto out;
1582         }
1583
1584         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1585         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1586         if (!fattr->mode)
1587                 fattr->mode = S_IFDIR;
1588         memset(fhandle, 0, sizeof(struct nfs_fh));
1589 out:
1590         if (page)
1591                 __free_page(page);
1592         if (locations)
1593                 kfree(locations);
1594         return status;
1595 }
1596
1597 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1598 {
1599         struct nfs4_getattr_arg args = {
1600                 .fh = fhandle,
1601                 .bitmask = server->attr_bitmask,
1602         };
1603         struct nfs4_getattr_res res = {
1604                 .fattr = fattr,
1605                 .server = server,
1606         };
1607         struct rpc_message msg = {
1608                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1609                 .rpc_argp = &args,
1610                 .rpc_resp = &res,
1611         };
1612
1613         nfs_fattr_init(fattr);
1614         return rpc_call_sync(server->client, &msg, 0);
1615 }
1616
1617 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1618 {
1619         struct nfs4_exception exception = { };
1620         int err;
1621         do {
1622                 err = nfs4_handle_exception(server,
1623                                 _nfs4_proc_getattr(server, fhandle, fattr),
1624                                 &exception);
1625         } while (exception.retry);
1626         return err;
1627 }
1628
1629 /*
1630  * The file is not closed if it is opened due to the a request to change
1631  * the size of the file. The open call will not be needed once the
1632  * VFS layer lookup-intents are implemented.
1633  *
1634  * Close is called when the inode is destroyed.
1635  * If we haven't opened the file for O_WRONLY, we
1636  * need to in the size_change case to obtain a stateid.
1637  *
1638  * Got race?
1639  * Because OPEN is always done by name in nfsv4, it is
1640  * possible that we opened a different file by the same
1641  * name.  We can recognize this race condition, but we
1642  * can't do anything about it besides returning an error.
1643  *
1644  * This will be fixed with VFS changes (lookup-intent).
1645  */
1646 static int
1647 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1648                   struct iattr *sattr)
1649 {
1650         struct inode *inode = dentry->d_inode;
1651         struct rpc_cred *cred = NULL;
1652         struct nfs4_state *state = NULL;
1653         int status;
1654
1655         nfs_fattr_init(fattr);
1656
1657         /* Search for an existing open(O_WRITE) file */
1658         if (sattr->ia_valid & ATTR_FILE) {
1659                 struct nfs_open_context *ctx;
1660
1661                 ctx = nfs_file_open_context(sattr->ia_file);
1662                 cred = ctx->cred;
1663                 state = ctx->state;
1664         }
1665
1666         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
1667         if (status == 0)
1668                 nfs_setattr_update_inode(inode, sattr);
1669         return status;
1670 }
1671
1672 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1673                 const struct qstr *name, struct nfs_fh *fhandle,
1674                 struct nfs_fattr *fattr)
1675 {
1676         int                    status;
1677         struct nfs4_lookup_arg args = {
1678                 .bitmask = server->attr_bitmask,
1679                 .dir_fh = dirfh,
1680                 .name = name,
1681         };
1682         struct nfs4_lookup_res res = {
1683                 .server = server,
1684                 .fattr = fattr,
1685                 .fh = fhandle,
1686         };
1687         struct rpc_message msg = {
1688                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1689                 .rpc_argp = &args,
1690                 .rpc_resp = &res,
1691         };
1692
1693         nfs_fattr_init(fattr);
1694
1695         dprintk("NFS call  lookupfh %s\n", name->name);
1696         status = rpc_call_sync(server->client, &msg, 0);
1697         dprintk("NFS reply lookupfh: %d\n", status);
1698         return status;
1699 }
1700
1701 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1702                               struct qstr *name, struct nfs_fh *fhandle,
1703                               struct nfs_fattr *fattr)
1704 {
1705         struct nfs4_exception exception = { };
1706         int err;
1707         do {
1708                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1709                 /* FIXME: !!!! */
1710                 if (err == -NFS4ERR_MOVED) {
1711                         err = -EREMOTE;
1712                         break;
1713                 }
1714                 err = nfs4_handle_exception(server, err, &exception);
1715         } while (exception.retry);
1716         return err;
1717 }
1718
1719 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1720                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1721 {
1722         int status;
1723
1724         dprintk("NFS call  lookup %s\n", name->name);
1725         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1726         if (status == -NFS4ERR_MOVED)
1727                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1728         dprintk("NFS reply lookup: %d\n", status);
1729         return status;
1730 }
1731
1732 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1733 {
1734         struct nfs4_exception exception = { };
1735         int err;
1736         do {
1737                 err = nfs4_handle_exception(NFS_SERVER(dir),
1738                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1739                                 &exception);
1740         } while (exception.retry);
1741         return err;
1742 }
1743
1744 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1745 {
1746         struct nfs_server *server = NFS_SERVER(inode);
1747         struct nfs_fattr fattr;
1748         struct nfs4_accessargs args = {
1749                 .fh = NFS_FH(inode),
1750                 .bitmask = server->attr_bitmask,
1751         };
1752         struct nfs4_accessres res = {
1753                 .server = server,
1754                 .fattr = &fattr,
1755         };
1756         struct rpc_message msg = {
1757                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1758                 .rpc_argp = &args,
1759                 .rpc_resp = &res,
1760                 .rpc_cred = entry->cred,
1761         };
1762         int mode = entry->mask;
1763         int status;
1764
1765         /*
1766          * Determine which access bits we want to ask for...
1767          */
1768         if (mode & MAY_READ)
1769                 args.access |= NFS4_ACCESS_READ;
1770         if (S_ISDIR(inode->i_mode)) {
1771                 if (mode & MAY_WRITE)
1772                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1773                 if (mode & MAY_EXEC)
1774                         args.access |= NFS4_ACCESS_LOOKUP;
1775         } else {
1776                 if (mode & MAY_WRITE)
1777                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1778                 if (mode & MAY_EXEC)
1779                         args.access |= NFS4_ACCESS_EXECUTE;
1780         }
1781         nfs_fattr_init(&fattr);
1782         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1783         if (!status) {
1784                 entry->mask = 0;
1785                 if (res.access & NFS4_ACCESS_READ)
1786                         entry->mask |= MAY_READ;
1787                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1788                         entry->mask |= MAY_WRITE;
1789                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1790                         entry->mask |= MAY_EXEC;
1791                 nfs_refresh_inode(inode, &fattr);
1792         }
1793         return status;
1794 }
1795
1796 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1797 {
1798         struct nfs4_exception exception = { };
1799         int err;
1800         do {
1801                 err = nfs4_handle_exception(NFS_SERVER(inode),
1802                                 _nfs4_proc_access(inode, entry),
1803                                 &exception);
1804         } while (exception.retry);
1805         return err;
1806 }
1807
1808 /*
1809  * TODO: For the time being, we don't try to get any attributes
1810  * along with any of the zero-copy operations READ, READDIR,
1811  * READLINK, WRITE.
1812  *
1813  * In the case of the first three, we want to put the GETATTR
1814  * after the read-type operation -- this is because it is hard
1815  * to predict the length of a GETATTR response in v4, and thus
1816  * align the READ data correctly.  This means that the GETATTR
1817  * may end up partially falling into the page cache, and we should
1818  * shift it into the 'tail' of the xdr_buf before processing.
1819  * To do this efficiently, we need to know the total length
1820  * of data received, which doesn't seem to be available outside
1821  * of the RPC layer.
1822  *
1823  * In the case of WRITE, we also want to put the GETATTR after
1824  * the operation -- in this case because we want to make sure
1825  * we get the post-operation mtime and size.  This means that
1826  * we can't use xdr_encode_pages() as written: we need a variant
1827  * of it which would leave room in the 'tail' iovec.
1828  *
1829  * Both of these changes to the XDR layer would in fact be quite
1830  * minor, but I decided to leave them for a subsequent patch.
1831  */
1832 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1833                 unsigned int pgbase, unsigned int pglen)
1834 {
1835         struct nfs4_readlink args = {
1836                 .fh       = NFS_FH(inode),
1837                 .pgbase   = pgbase,
1838                 .pglen    = pglen,
1839                 .pages    = &page,
1840         };
1841         struct rpc_message msg = {
1842                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1843                 .rpc_argp = &args,
1844                 .rpc_resp = NULL,
1845         };
1846
1847         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1848 }
1849
1850 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1851                 unsigned int pgbase, unsigned int pglen)
1852 {
1853         struct nfs4_exception exception = { };
1854         int err;
1855         do {
1856                 err = nfs4_handle_exception(NFS_SERVER(inode),
1857                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1858                                 &exception);
1859         } while (exception.retry);
1860         return err;
1861 }
1862
1863 /*
1864  * Got race?
1865  * We will need to arrange for the VFS layer to provide an atomic open.
1866  * Until then, this create/open method is prone to inefficiency and race
1867  * conditions due to the lookup, create, and open VFS calls from sys_open()
1868  * placed on the wire.
1869  *
1870  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1871  * The file will be opened again in the subsequent VFS open call
1872  * (nfs4_proc_file_open).
1873  *
1874  * The open for read will just hang around to be used by any process that
1875  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1876  */
1877
1878 static int
1879 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1880                  int flags, struct nameidata *nd)
1881 {
1882         struct path path = {
1883                 .mnt = nd->path.mnt,
1884                 .dentry = dentry,
1885         };
1886         struct nfs4_state *state;
1887         struct rpc_cred *cred;
1888         int status = 0;
1889
1890         cred = rpc_lookup_cred();
1891         if (IS_ERR(cred)) {
1892                 status = PTR_ERR(cred);
1893                 goto out;
1894         }
1895         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1896         d_drop(dentry);
1897         if (IS_ERR(state)) {
1898                 status = PTR_ERR(state);
1899                 goto out_putcred;
1900         }
1901         d_add(dentry, igrab(state->inode));
1902         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1903         if (flags & O_EXCL) {
1904                 struct nfs_fattr fattr;
1905                 status = nfs4_do_setattr(state->inode, cred, &fattr, sattr, state);
1906                 if (status == 0)
1907                         nfs_setattr_update_inode(state->inode, sattr);
1908                 nfs_post_op_update_inode(state->inode, &fattr);
1909         }
1910         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1911                 status = nfs4_intent_set_file(nd, &path, state);
1912         else
1913                 nfs4_close_sync(&path, state, flags);
1914 out_putcred:
1915         put_rpccred(cred);
1916 out:
1917         return status;
1918 }
1919
1920 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1921 {
1922         struct nfs_server *server = NFS_SERVER(dir);
1923         struct nfs_removeargs args = {
1924                 .fh = NFS_FH(dir),
1925                 .name.len = name->len,
1926                 .name.name = name->name,
1927                 .bitmask = server->attr_bitmask,
1928         };
1929         struct nfs_removeres res = {
1930                 .server = server,
1931         };
1932         struct rpc_message msg = {
1933                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1934                 .rpc_argp = &args,
1935                 .rpc_resp = &res,
1936         };
1937         int                     status;
1938
1939         nfs_fattr_init(&res.dir_attr);
1940         status = rpc_call_sync(server->client, &msg, 0);
1941         if (status == 0) {
1942                 update_changeattr(dir, &res.cinfo);
1943                 nfs_post_op_update_inode(dir, &res.dir_attr);
1944         }
1945         return status;
1946 }
1947
1948 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1949 {
1950         struct nfs4_exception exception = { };
1951         int err;
1952         do {
1953                 err = nfs4_handle_exception(NFS_SERVER(dir),
1954                                 _nfs4_proc_remove(dir, name),
1955                                 &exception);
1956         } while (exception.retry);
1957         return err;
1958 }
1959
1960 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1961 {
1962         struct nfs_server *server = NFS_SERVER(dir);
1963         struct nfs_removeargs *args = msg->rpc_argp;
1964         struct nfs_removeres *res = msg->rpc_resp;
1965
1966         args->bitmask = server->attr_bitmask;
1967         res->server = server;
1968         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1969 }
1970
1971 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1972 {
1973         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1974
1975         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1976                 return 0;
1977         update_changeattr(dir, &res->cinfo);
1978         nfs_post_op_update_inode(dir, &res->dir_attr);
1979         return 1;
1980 }
1981
1982 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1983                 struct inode *new_dir, struct qstr *new_name)
1984 {
1985         struct nfs_server *server = NFS_SERVER(old_dir);
1986         struct nfs4_rename_arg arg = {
1987                 .old_dir = NFS_FH(old_dir),
1988                 .new_dir = NFS_FH(new_dir),
1989                 .old_name = old_name,
1990                 .new_name = new_name,
1991                 .bitmask = server->attr_bitmask,
1992         };
1993         struct nfs_fattr old_fattr, new_fattr;
1994         struct nfs4_rename_res res = {
1995                 .server = server,
1996                 .old_fattr = &old_fattr,
1997                 .new_fattr = &new_fattr,
1998         };
1999         struct rpc_message msg = {
2000                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2001                 .rpc_argp = &arg,
2002                 .rpc_resp = &res,
2003         };
2004         int                     status;
2005
2006         nfs_fattr_init(res.old_fattr);
2007         nfs_fattr_init(res.new_fattr);
2008         status = rpc_call_sync(server->client, &msg, 0);
2009
2010         if (!status) {
2011                 update_changeattr(old_dir, &res.old_cinfo);
2012                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2013                 update_changeattr(new_dir, &res.new_cinfo);
2014                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2015         }
2016         return status;
2017 }
2018
2019 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2020                 struct inode *new_dir, struct qstr *new_name)
2021 {
2022         struct nfs4_exception exception = { };
2023         int err;
2024         do {
2025                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2026                                 _nfs4_proc_rename(old_dir, old_name,
2027                                         new_dir, new_name),
2028                                 &exception);
2029         } while (exception.retry);
2030         return err;
2031 }
2032
2033 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2034 {
2035         struct nfs_server *server = NFS_SERVER(inode);
2036         struct nfs4_link_arg arg = {
2037                 .fh     = NFS_FH(inode),
2038                 .dir_fh = NFS_FH(dir),
2039                 .name   = name,
2040                 .bitmask = server->attr_bitmask,
2041         };
2042         struct nfs_fattr fattr, dir_attr;
2043         struct nfs4_link_res res = {
2044                 .server = server,
2045                 .fattr = &fattr,
2046                 .dir_attr = &dir_attr,
2047         };
2048         struct rpc_message msg = {
2049                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2050                 .rpc_argp = &arg,
2051                 .rpc_resp = &res,
2052         };
2053         int                     status;
2054
2055         nfs_fattr_init(res.fattr);
2056         nfs_fattr_init(res.dir_attr);
2057         status = rpc_call_sync(server->client, &msg, 0);
2058         if (!status) {
2059                 update_changeattr(dir, &res.cinfo);
2060                 nfs_post_op_update_inode(dir, res.dir_attr);
2061                 nfs_post_op_update_inode(inode, res.fattr);
2062         }
2063
2064         return status;
2065 }
2066
2067 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2068 {
2069         struct nfs4_exception exception = { };
2070         int err;
2071         do {
2072                 err = nfs4_handle_exception(NFS_SERVER(inode),
2073                                 _nfs4_proc_link(inode, dir, name),
2074                                 &exception);
2075         } while (exception.retry);
2076         return err;
2077 }
2078
2079 struct nfs4_createdata {
2080         struct rpc_message msg;
2081         struct nfs4_create_arg arg;
2082         struct nfs4_create_res res;
2083         struct nfs_fh fh;
2084         struct nfs_fattr fattr;
2085         struct nfs_fattr dir_fattr;
2086 };
2087
2088 static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
2089                 struct qstr *name, struct iattr *sattr, u32 ftype)
2090 {
2091         struct nfs4_createdata *data;
2092
2093         data = kzalloc(sizeof(*data), GFP_KERNEL);
2094         if (data != NULL) {
2095                 struct nfs_server *server = NFS_SERVER(dir);
2096
2097                 data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
2098                 data->msg.rpc_argp = &data->arg;
2099                 data->msg.rpc_resp = &data->res;
2100                 data->arg.dir_fh = NFS_FH(dir);
2101                 data->arg.server = server;
2102                 data->arg.name = name;
2103                 data->arg.attrs = sattr;
2104                 data->arg.ftype = ftype;
2105                 data->arg.bitmask = server->attr_bitmask;
2106                 data->res.server = server;
2107                 data->res.fh = &data->fh;
2108                 data->res.fattr = &data->fattr;
2109                 data->res.dir_fattr = &data->dir_fattr;
2110                 nfs_fattr_init(data->res.fattr);
2111                 nfs_fattr_init(data->res.dir_fattr);
2112         }
2113         return data;
2114 }
2115
2116 static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
2117 {
2118         int status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
2119         if (status == 0) {
2120                 update_changeattr(dir, &data->res.dir_cinfo);
2121                 nfs_post_op_update_inode(dir, data->res.dir_fattr);
2122                 status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
2123         }
2124         return status;
2125 }
2126
2127 static void nfs4_free_createdata(struct nfs4_createdata *data)
2128 {
2129         kfree(data);
2130 }
2131
2132 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2133                 struct page *page, unsigned int len, struct iattr *sattr)
2134 {
2135         struct nfs4_createdata *data;
2136         int status = -ENAMETOOLONG;
2137
2138         if (len > NFS4_MAXPATHLEN)
2139                 goto out;
2140
2141         status = -ENOMEM;
2142         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
2143         if (data == NULL)
2144                 goto out;
2145
2146         data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
2147         data->arg.u.symlink.pages = &page;
2148         data->arg.u.symlink.len = len;
2149
2150         status = nfs4_do_create(dir, dentry, data);
2151
2152         nfs4_free_createdata(data);
2153 out:
2154         return status;
2155 }
2156
2157 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2158                 struct page *page, unsigned int len, struct iattr *sattr)
2159 {
2160         struct nfs4_exception exception = { };
2161         int err;
2162         do {
2163                 err = nfs4_handle_exception(NFS_SERVER(dir),
2164                                 _nfs4_proc_symlink(dir, dentry, page,
2165                                                         len, sattr),
2166                                 &exception);
2167         } while (exception.retry);
2168         return err;
2169 }
2170
2171 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2172                 struct iattr *sattr)
2173 {
2174         struct nfs4_createdata *data;
2175         int status = -ENOMEM;
2176
2177         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
2178         if (data == NULL)
2179                 goto out;
2180
2181         status = nfs4_do_create(dir, dentry, data);
2182
2183         nfs4_free_createdata(data);
2184 out:
2185         return status;
2186 }
2187
2188 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2189                 struct iattr *sattr)
2190 {
2191         struct nfs4_exception exception = { };
2192         int err;
2193         do {
2194                 err = nfs4_handle_exception(NFS_SERVER(dir),
2195                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2196                                 &exception);
2197         } while (exception.retry);
2198         return err;
2199 }
2200
2201 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2202                   u64 cookie, struct page *page, unsigned int count, int plus)
2203 {
2204         struct inode            *dir = dentry->d_inode;
2205         struct nfs4_readdir_arg args = {
2206                 .fh = NFS_FH(dir),
2207                 .pages = &page,
2208                 .pgbase = 0,
2209                 .count = count,
2210                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2211         };
2212         struct nfs4_readdir_res res;
2213         struct rpc_message msg = {
2214                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2215                 .rpc_argp = &args,
2216                 .rpc_resp = &res,
2217                 .rpc_cred = cred,
2218         };
2219         int                     status;
2220
2221         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2222                         dentry->d_parent->d_name.name,
2223                         dentry->d_name.name,
2224                         (unsigned long long)cookie);
2225         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2226         res.pgbase = args.pgbase;
2227         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2228         if (status == 0)
2229                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2230
2231         nfs_invalidate_atime(dir);
2232
2233         dprintk("%s: returns %d\n", __func__, status);
2234         return status;
2235 }
2236
2237 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2238                   u64 cookie, struct page *page, unsigned int count, int plus)
2239 {
2240         struct nfs4_exception exception = { };
2241         int err;
2242         do {
2243                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2244                                 _nfs4_proc_readdir(dentry, cred, cookie,
2245                                         page, count, plus),
2246                                 &exception);
2247         } while (exception.retry);
2248         return err;
2249 }
2250
2251 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2252                 struct iattr *sattr, dev_t rdev)
2253 {
2254         struct nfs4_createdata *data;
2255         int mode = sattr->ia_mode;
2256         int status = -ENOMEM;
2257
2258         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2259         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2260
2261         data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
2262         if (data == NULL)
2263                 goto out;
2264
2265         if (S_ISFIFO(mode))
2266                 data->arg.ftype = NF4FIFO;
2267         else if (S_ISBLK(mode)) {
2268                 data->arg.ftype = NF4BLK;
2269                 data->arg.u.device.specdata1 = MAJOR(rdev);
2270                 data->arg.u.device.specdata2 = MINOR(rdev);
2271         }
2272         else if (S_ISCHR(mode)) {
2273                 data->arg.ftype = NF4CHR;
2274                 data->arg.u.device.specdata1 = MAJOR(rdev);
2275                 data->arg.u.device.specdata2 = MINOR(rdev);
2276         }
2277
2278         status = nfs4_do_create(dir, dentry, data);
2279
2280         nfs4_free_createdata(data);
2281 out:
2282         return status;
2283 }
2284
2285 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2286                 struct iattr *sattr, dev_t rdev)
2287 {
2288         struct nfs4_exception exception = { };
2289         int err;
2290         do {
2291                 err = nfs4_handle_exception(NFS_SERVER(dir),
2292                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2293                                 &exception);
2294         } while (exception.retry);
2295         return err;
2296 }
2297
2298 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2299                  struct nfs_fsstat *fsstat)
2300 {
2301         struct nfs4_statfs_arg args = {
2302                 .fh = fhandle,
2303                 .bitmask = server->attr_bitmask,
2304         };
2305         struct rpc_message msg = {
2306                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2307                 .rpc_argp = &args,
2308                 .rpc_resp = fsstat,
2309         };
2310
2311         nfs_fattr_init(fsstat->fattr);
2312         return rpc_call_sync(server->client, &msg, 0);
2313 }
2314
2315 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2316 {
2317         struct nfs4_exception exception = { };
2318         int err;
2319         do {
2320                 err = nfs4_handle_exception(server,
2321                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2322                                 &exception);
2323         } while (exception.retry);
2324         return err;
2325 }
2326
2327 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2328                 struct nfs_fsinfo *fsinfo)
2329 {
2330         struct nfs4_fsinfo_arg args = {
2331                 .fh = fhandle,
2332                 .bitmask = server->attr_bitmask,
2333         };
2334         struct rpc_message msg = {
2335                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2336                 .rpc_argp = &args,
2337                 .rpc_resp = fsinfo,
2338         };
2339
2340         return rpc_call_sync(server->client, &msg, 0);
2341 }
2342
2343 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2344 {
2345         struct nfs4_exception exception = { };
2346         int err;
2347
2348         do {
2349                 err = nfs4_handle_exception(server,
2350                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2351                                 &exception);
2352         } while (exception.retry);
2353         return err;
2354 }
2355
2356 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2357 {
2358         nfs_fattr_init(fsinfo->fattr);
2359         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2360 }
2361
2362 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2363                 struct nfs_pathconf *pathconf)
2364 {
2365         struct nfs4_pathconf_arg args = {
2366                 .fh = fhandle,
2367                 .bitmask = server->attr_bitmask,
2368         };
2369         struct rpc_message msg = {
2370                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2371                 .rpc_argp = &args,
2372                 .rpc_resp = pathconf,
2373         };
2374
2375         /* None of the pathconf attributes are mandatory to implement */
2376         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2377                 memset(pathconf, 0, sizeof(*pathconf));
2378                 return 0;
2379         }
2380
2381         nfs_fattr_init(pathconf->fattr);
2382         return rpc_call_sync(server->client, &msg, 0);
2383 }
2384
2385 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2386                 struct nfs_pathconf *pathconf)
2387 {
2388         struct nfs4_exception exception = { };
2389         int err;
2390
2391         do {
2392                 err = nfs4_handle_exception(server,
2393                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2394                                 &exception);
2395         } while (exception.retry);
2396         return err;
2397 }
2398
2399 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2400 {
2401         struct nfs_server *server = NFS_SERVER(data->inode);
2402
2403         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2404                 rpc_restart_call(task);
2405                 return -EAGAIN;
2406         }
2407
2408         nfs_invalidate_atime(data->inode);
2409         if (task->tk_status > 0)
2410                 renew_lease(server, data->timestamp);
2411         return 0;
2412 }
2413
2414 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2415 {
2416         data->timestamp   = jiffies;
2417         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2418 }
2419
2420 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2421 {
2422         struct inode *inode = data->inode;
2423
2424         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2425                 rpc_restart_call(task);
2426                 return -EAGAIN;
2427         }
2428         if (task->tk_status >= 0) {
2429                 renew_lease(NFS_SERVER(inode), data->timestamp);
2430                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2431         }
2432         return 0;
2433 }
2434
2435 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2436 {
2437         struct nfs_server *server = NFS_SERVER(data->inode);
2438
2439         data->args.bitmask = server->attr_bitmask;
2440         data->res.server = server;
2441         data->timestamp   = jiffies;
2442
2443         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2444 }
2445
2446 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2447 {
2448         struct inode *inode = data->inode;
2449
2450         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2451                 rpc_restart_call(task);
2452                 return -EAGAIN;
2453         }
2454         nfs_refresh_inode(inode, data->res.fattr);
2455         return 0;
2456 }
2457
2458 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2459 {
2460         struct nfs_server *server = NFS_SERVER(data->inode);
2461
2462         data->args.bitmask = server->attr_bitmask;
2463         data->res.server = server;
2464         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2465 }
2466
2467 /*
2468  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2469  * standalone procedure for queueing an asynchronous RENEW.
2470  */
2471 static void nfs4_renew_done(struct rpc_task *task, void *data)
2472 {
2473         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2474         unsigned long timestamp = (unsigned long)data;
2475
2476         if (task->tk_status < 0) {
2477                 switch (task->tk_status) {
2478                         case -NFS4ERR_STALE_CLIENTID:
2479                         case -NFS4ERR_EXPIRED:
2480                         case -NFS4ERR_CB_PATH_DOWN:
2481                                 nfs4_schedule_state_recovery(clp);
2482                 }
2483                 return;
2484         }
2485         spin_lock(&clp->cl_lock);
2486         if (time_before(clp->cl_last_renewal,timestamp))
2487                 clp->cl_last_renewal = timestamp;
2488         spin_unlock(&clp->cl_lock);
2489 }
2490
2491 static const struct rpc_call_ops nfs4_renew_ops = {
2492         .rpc_call_done = nfs4_renew_done,
2493 };
2494
2495 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2496 {
2497         struct rpc_message msg = {
2498                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2499                 .rpc_argp       = clp,
2500                 .rpc_cred       = cred,
2501         };
2502
2503         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2504                         &nfs4_renew_ops, (void *)jiffies);
2505 }
2506
2507 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2508 {
2509         struct rpc_message msg = {
2510                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2511                 .rpc_argp       = clp,
2512                 .rpc_cred       = cred,
2513         };
2514         unsigned long now = jiffies;
2515         int status;
2516
2517         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2518         if (status < 0)
2519                 return status;
2520         spin_lock(&clp->cl_lock);
2521         if (time_before(clp->cl_last_renewal,now))
2522                 clp->cl_last_renewal = now;
2523         spin_unlock(&clp->cl_lock);
2524         return 0;
2525 }
2526
2527 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2528 {
2529         return (server->caps & NFS_CAP_ACLS)
2530                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2531                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2532 }
2533
2534 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2535  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2536  * the stack.
2537  */
2538 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2539
2540 static void buf_to_pages(const void *buf, size_t buflen,
2541                 struct page **pages, unsigned int *pgbase)
2542 {
2543         const void *p = buf;
2544
2545         *pgbase = offset_in_page(buf);
2546         p -= *pgbase;
2547         while (p < buf + buflen) {
2548                 *(pages++) = virt_to_page(p);
2549                 p += PAGE_CACHE_SIZE;
2550         }
2551 }
2552
2553 struct nfs4_cached_acl {
2554         int cached;
2555         size_t len;
2556         char data[0];
2557 };
2558
2559 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2560 {
2561         struct nfs_inode *nfsi = NFS_I(inode);
2562
2563         spin_lock(&inode->i_lock);
2564         kfree(nfsi->nfs4_acl);
2565         nfsi->nfs4_acl = acl;
2566         spin_unlock(&inode->i_lock);
2567 }
2568
2569 static void nfs4_zap_acl_attr(struct inode *inode)
2570 {
2571         nfs4_set_cached_acl(inode, NULL);
2572 }
2573
2574 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2575 {
2576         struct nfs_inode *nfsi = NFS_I(inode);
2577         struct nfs4_cached_acl *acl;
2578         int ret = -ENOENT;
2579
2580         spin_lock(&inode->i_lock);
2581         acl = nfsi->nfs4_acl;
2582         if (acl == NULL)
2583                 goto out;
2584         if (buf == NULL) /* user is just asking for length */
2585                 goto out_len;
2586         if (acl->cached == 0)
2587                 goto out;
2588         ret = -ERANGE; /* see getxattr(2) man page */
2589         if (acl->len > buflen)
2590                 goto out;
2591         memcpy(buf, acl->data, acl->len);
2592 out_len:
2593         ret = acl->len;
2594 out:
2595         spin_unlock(&inode->i_lock);
2596         return ret;
2597 }
2598
2599 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2600 {
2601         struct nfs4_cached_acl *acl;
2602
2603         if (buf && acl_len <= PAGE_SIZE) {
2604                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2605                 if (acl == NULL)
2606                         goto out;
2607                 acl->cached = 1;
2608                 memcpy(acl->data, buf, acl_len);
2609         } else {
2610                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2611                 if (acl == NULL)
2612                         goto out;
2613                 acl->cached = 0;
2614         }
2615         acl->len = acl_len;
2616 out:
2617         nfs4_set_cached_acl(inode, acl);
2618 }
2619
2620 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2621 {
2622         struct page *pages[NFS4ACL_MAXPAGES];
2623         struct nfs_getaclargs args = {
2624                 .fh = NFS_FH(inode),
2625                 .acl_pages = pages,
2626                 .acl_len = buflen,
2627         };
2628         size_t resp_len = buflen;
2629         void *resp_buf;
2630         struct rpc_message msg = {
2631                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2632                 .rpc_argp = &args,
2633                 .rpc_resp = &resp_len,
2634         };
2635         struct page *localpage = NULL;
2636         int ret;
2637
2638         if (buflen < PAGE_SIZE) {
2639                 /* As long as we're doing a round trip to the server anyway,
2640                  * let's be prepared for a page of acl data. */
2641                 localpage = alloc_page(GFP_KERNEL);
2642                 resp_buf = page_address(localpage);
2643                 if (localpage == NULL)
2644                         return -ENOMEM;
2645                 args.acl_pages[0] = localpage;
2646                 args.acl_pgbase = 0;
2647                 resp_len = args.acl_len = PAGE_SIZE;
2648         } else {
2649                 resp_buf = buf;
2650                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2651         }
2652         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2653         if (ret)
2654                 goto out_free;
2655         if (resp_len > args.acl_len)
2656                 nfs4_write_cached_acl(inode, NULL, resp_len);
2657         else
2658                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2659         if (buf) {
2660                 ret = -ERANGE;
2661                 if (resp_len > buflen)
2662                         goto out_free;
2663                 if (localpage)
2664                         memcpy(buf, resp_buf, resp_len);
2665         }
2666         ret = resp_len;
2667 out_free:
2668         if (localpage)
2669                 __free_page(localpage);
2670         return ret;
2671 }
2672
2673 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2674 {
2675         struct nfs4_exception exception = { };
2676         ssize_t ret;
2677         do {
2678                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2679                 if (ret >= 0)
2680                         break;
2681                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2682         } while (exception.retry);
2683         return ret;
2684 }
2685
2686 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2687 {
2688         struct nfs_server *server = NFS_SERVER(inode);
2689         int ret;
2690
2691         if (!nfs4_server_supports_acls(server))
2692                 return -EOPNOTSUPP;
2693         ret = nfs_revalidate_inode(server, inode);
2694         if (ret < 0)
2695                 return ret;
2696         if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
2697                 nfs_zap_acl_cache(inode);
2698         ret = nfs4_read_cached_acl(inode, buf, buflen);
2699         if (ret != -ENOENT)
2700                 return ret;
2701         return nfs4_get_acl_uncached(inode, buf, buflen);
2702 }
2703
2704 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2705 {
2706         struct nfs_server *server = NFS_SERVER(inode);
2707         struct page *pages[NFS4ACL_MAXPAGES];
2708         struct nfs_setaclargs arg = {
2709                 .fh             = NFS_FH(inode),
2710                 .acl_pages      = pages,
2711                 .acl_len        = buflen,
2712         };
2713         struct rpc_message msg = {
2714                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2715                 .rpc_argp       = &arg,
2716                 .rpc_resp       = NULL,
2717         };
2718         int ret;
2719
2720         if (!nfs4_server_supports_acls(server))
2721                 return -EOPNOTSUPP;
2722         nfs_inode_return_delegation(inode);
2723         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2724         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2725         nfs_access_zap_cache(inode);
2726         nfs_zap_acl_cache(inode);
2727         return ret;
2728 }
2729
2730 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2731 {
2732         struct nfs4_exception exception = { };
2733         int err;
2734         do {
2735                 err = nfs4_handle_exception(NFS_SERVER(inode),
2736                                 __nfs4_proc_set_acl(inode, buf, buflen),
2737                                 &exception);
2738         } while (exception.retry);
2739         return err;
2740 }
2741
2742 static int
2743 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2744 {
2745         struct nfs_client *clp = server->nfs_client;
2746
2747         if (!clp || task->tk_status >= 0)
2748                 return 0;
2749         switch(task->tk_status) {
2750                 case -NFS4ERR_STALE_CLIENTID:
2751                 case -NFS4ERR_STALE_STATEID:
2752                 case -NFS4ERR_EXPIRED:
2753                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
2754                         nfs4_schedule_state_recovery(clp);
2755                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2756                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
2757                         task->tk_status = 0;
2758                         return -EAGAIN;
2759                 case -NFS4ERR_DELAY:
2760                         nfs_inc_server_stats(server, NFSIOS_DELAY);
2761                 case -NFS4ERR_GRACE:
2762                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2763                         task->tk_status = 0;
2764                         return -EAGAIN;
2765                 case -NFS4ERR_OLD_STATEID:
2766                         task->tk_status = 0;
2767                         return -EAGAIN;
2768         }
2769         task->tk_status = nfs4_map_errors(task->tk_status);
2770         return 0;
2771 }
2772
2773 static int nfs4_wait_bit_killable(void *word)
2774 {
2775         if (fatal_signal_pending(current))
2776                 return -ERESTARTSYS;
2777         schedule();
2778         return 0;
2779 }
2780
2781 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2782 {
2783         int res;
2784
2785         might_sleep();
2786
2787         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2788
2789         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2790                         nfs4_wait_bit_killable, TASK_KILLABLE);
2791
2792         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2793         return res;
2794 }
2795
2796 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2797 {
2798         int res = 0;
2799
2800         might_sleep();
2801
2802         if (*timeout <= 0)
2803                 *timeout = NFS4_POLL_RETRY_MIN;
2804         if (*timeout > NFS4_POLL_RETRY_MAX)
2805                 *timeout = NFS4_POLL_RETRY_MAX;
2806         schedule_timeout_killable(*timeout);
2807         if (fatal_signal_pending(current))
2808                 res = -ERESTARTSYS;
2809         *timeout <<= 1;
2810         return res;
2811 }
2812
2813 /* This is the error handling routine for processes that are allowed
2814  * to sleep.
2815  */
2816 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2817 {
2818         struct nfs_client *clp = server->nfs_client;
2819         int ret = errorcode;
2820
2821         exception->retry = 0;
2822         switch(errorcode) {
2823                 case 0:
2824                         return 0;
2825                 case -NFS4ERR_STALE_CLIENTID:
2826                 case -NFS4ERR_STALE_STATEID:
2827                 case -NFS4ERR_EXPIRED:
2828                         nfs4_schedule_state_recovery(clp);
2829                         ret = nfs4_wait_clnt_recover(server->client, clp);
2830                         if (ret == 0)
2831                                 exception->retry = 1;
2832                         break;
2833                 case -NFS4ERR_FILE_OPEN:
2834                 case -NFS4ERR_GRACE:
2835                 case -NFS4ERR_DELAY:
2836                         ret = nfs4_delay(server->client, &exception->timeout);
2837                         if (ret != 0)
2838                                 break;
2839                 case -NFS4ERR_OLD_STATEID:
2840                         exception->retry = 1;
2841         }
2842         /* We failed to handle the error */
2843         return nfs4_map_errors(ret);
2844 }
2845
2846 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2847 {
2848         nfs4_verifier sc_verifier;
2849         struct nfs4_setclientid setclientid = {
2850                 .sc_verifier = &sc_verifier,
2851                 .sc_prog = program,
2852         };
2853         struct rpc_message msg = {
2854                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2855                 .rpc_argp = &setclientid,
2856                 .rpc_resp = clp,
2857                 .rpc_cred = cred,
2858         };
2859         __be32 *p;
2860         int loop = 0;
2861         int status;
2862
2863         p = (__be32*)sc_verifier.data;
2864         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2865         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2866
2867         for(;;) {
2868                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2869                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
2870                                 clp->cl_ipaddr,
2871                                 rpc_peeraddr2str(clp->cl_rpcclient,
2872                                                         RPC_DISPLAY_ADDR),
2873                                 rpc_peeraddr2str(clp->cl_rpcclient,
2874                                                         RPC_DISPLAY_PROTO),
2875                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
2876                                 clp->cl_id_uniquifier);
2877                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2878                                 sizeof(setclientid.sc_netid),
2879                                 rpc_peeraddr2str(clp->cl_rpcclient,
2880                                                         RPC_DISPLAY_NETID));
2881                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2882                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
2883                                 clp->cl_ipaddr, port >> 8, port & 255);
2884
2885                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2886                 if (status != -NFS4ERR_CLID_INUSE)
2887                         break;
2888                 if (signalled())
2889                         break;
2890                 if (loop++ & 1)
2891                         ssleep(clp->cl_lease_time + 1);
2892                 else
2893                         if (++clp->cl_id_uniquifier == 0)
2894                                 break;
2895         }
2896         return status;
2897 }
2898
2899 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2900 {
2901         struct nfs_fsinfo fsinfo;
2902         struct rpc_message msg = {
2903                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2904                 .rpc_argp = clp,
2905                 .rpc_resp = &fsinfo,
2906                 .rpc_cred = cred,
2907         };
2908         unsigned long now;
2909         int status;
2910
2911         now = jiffies;
2912         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2913         if (status == 0) {
2914                 spin_lock(&clp->cl_lock);
2915                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2916                 clp->cl_last_renewal = now;
2917                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2918                 spin_unlock(&clp->cl_lock);
2919         }
2920         return status;
2921 }
2922
2923 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2924 {
2925         long timeout = 0;
2926         int err;
2927         do {
2928                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2929                 switch (err) {
2930                         case 0:
2931                                 return err;
2932                         case -NFS4ERR_RESOURCE:
2933                                 /* The IBM lawyers misread another document! */
2934                         case -NFS4ERR_DELAY:
2935                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2936                 }
2937         } while (err == 0);
2938         return err;
2939 }
2940
2941 struct nfs4_delegreturndata {
2942         struct nfs4_delegreturnargs args;
2943         struct nfs4_delegreturnres res;
2944         struct nfs_fh fh;
2945         nfs4_stateid stateid;
2946         unsigned long timestamp;
2947         struct nfs_fattr fattr;
2948         int rpc_status;
2949 };
2950
2951 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2952 {
2953         struct nfs4_delegreturndata *data = calldata;
2954         data->rpc_status = task->tk_status;
2955         if (data->rpc_status == 0)
2956                 renew_lease(data->res.server, data->timestamp);
2957 }
2958
2959 static void nfs4_delegreturn_release(void *calldata)
2960 {
2961         kfree(calldata);
2962 }
2963
2964 static const struct rpc_call_ops nfs4_delegreturn_ops = {
2965         .rpc_call_done = nfs4_delegreturn_done,
2966         .rpc_release = nfs4_delegreturn_release,
2967 };
2968
2969 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
2970 {
2971         struct nfs4_delegreturndata *data;
2972         struct nfs_server *server = NFS_SERVER(inode);
2973         struct rpc_task *task;
2974         struct rpc_message msg = {
2975                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2976                 .rpc_cred = cred,
2977         };
2978         struct rpc_task_setup task_setup_data = {
2979                 .rpc_client = server->client,
2980                 .rpc_message = &msg,
2981                 .callback_ops = &nfs4_delegreturn_ops,
2982                 .flags = RPC_TASK_ASYNC,
2983         };
2984         int status = 0;
2985
2986         data = kmalloc(sizeof(*data), GFP_KERNEL);
2987         if (data == NULL)
2988                 return -ENOMEM;
2989         data->args.fhandle = &data->fh;
2990         data->args.stateid = &data->stateid;
2991         data->args.bitmask = server->attr_bitmask;
2992         nfs_copy_fh(&data->fh, NFS_FH(inode));
2993         memcpy(&data->stateid, stateid, sizeof(data->stateid));
2994         data->res.fattr = &data->fattr;
2995         data->res.server = server;
2996         nfs_fattr_init(data->res.fattr);
2997         data->timestamp = jiffies;
2998         data->rpc_status = 0;
2999
3000         task_setup_data.callback_data = data;
3001         msg.rpc_argp = &data->args,
3002         msg.rpc_resp = &data->res,
3003         task = rpc_run_task(&task_setup_data);
3004         if (IS_ERR(task))
3005                 return PTR_ERR(task);
3006         if (!issync)
3007                 goto out;
3008         status = nfs4_wait_for_completion_rpc_task(task);
3009         if (status != 0)
3010                 goto out;
3011         status = data->rpc_status;
3012         if (status != 0)
3013                 goto out;
3014         nfs_refresh_inode(inode, &data->fattr);
3015 out:
3016         rpc_put_task(task);
3017         return status;
3018 }
3019
3020 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3021 {
3022         struct nfs_server *server = NFS_SERVER(inode);
3023         struct nfs4_exception exception = { };
3024         int err;
3025         do {
3026                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3027                 switch (err) {
3028                         case -NFS4ERR_STALE_STATEID:
3029                         case -NFS4ERR_EXPIRED:
3030                         case 0:
3031                                 return 0;
3032                 }
3033                 err = nfs4_handle_exception(server, err, &exception);
3034         } while (exception.retry);
3035         return err;
3036 }
3037
3038 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3039 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3040
3041 /*
3042  * sleep, with exponential backoff, and retry the LOCK operation.
3043  */
3044 static unsigned long
3045 nfs4_set_lock_task_retry(unsigned long timeout)
3046 {
3047         schedule_timeout_killable(timeout);
3048         timeout <<= 1;
3049         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3050                 return NFS4_LOCK_MAXTIMEOUT;
3051         return timeout;
3052 }
3053
3054 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3055 {
3056         struct inode *inode = state->inode;
3057         struct nfs_server *server = NFS_SERVER(inode);
3058         struct nfs_client *clp = server->nfs_client;
3059         struct nfs_lockt_args arg = {
3060                 .fh = NFS_FH(inode),
3061                 .fl = request,
3062         };
3063         struct nfs_lockt_res res = {
3064                 .denied = request,
3065         };
3066         struct rpc_message msg = {
3067                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3068                 .rpc_argp       = &arg,
3069                 .rpc_resp       = &res,
3070                 .rpc_cred       = state->owner->so_cred,
3071         };
3072         struct nfs4_lock_state *lsp;
3073         int status;
3074
3075         down_read(&clp->cl_sem);
3076         arg.lock_owner.clientid = clp->cl_clientid;
3077         status = nfs4_set_lock_state(state, request);
3078         if (status != 0)
3079                 goto out;
3080         lsp = request->fl_u.nfs4_fl.owner;
3081         arg.lock_owner.id = lsp->ls_id.id;
3082         status = rpc_call_sync(server->client, &msg, 0);
3083         switch (status) {
3084                 case 0:
3085                         request->fl_type = F_UNLCK;
3086                         break;
3087                 case -NFS4ERR_DENIED:
3088                         status = 0;
3089         }
3090         request->fl_ops->fl_release_private(request);
3091 out:
3092         up_read(&clp->cl_sem);
3093         return status;
3094 }
3095
3096 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3097 {
3098         struct nfs4_exception exception = { };
3099         int err;
3100
3101         do {
3102                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3103                                 _nfs4_proc_getlk(state, cmd, request),
3104                                 &exception);
3105         } while (exception.retry);
3106         return err;
3107 }
3108
3109 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3110 {
3111         int res = 0;
3112         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3113                 case FL_POSIX:
3114                         res = posix_lock_file_wait(file, fl);
3115                         break;
3116                 case FL_FLOCK:
3117                         res = flock_lock_file_wait(file, fl);
3118                         break;
3119                 default:
3120                         BUG();
3121         }
3122         return res;
3123 }
3124
3125 struct nfs4_unlockdata {
3126         struct nfs_locku_args arg;
3127         struct nfs_locku_res res;
3128         struct nfs4_lock_state *lsp;
3129         struct nfs_open_context *ctx;
3130         struct file_lock fl;
3131         const struct nfs_server *server;
3132         unsigned long timestamp;
3133 };
3134
3135 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3136                 struct nfs_open_context *ctx,
3137                 struct nfs4_lock_state *lsp,
3138                 struct nfs_seqid *seqid)
3139 {
3140         struct nfs4_unlockdata *p;
3141         struct inode *inode = lsp->ls_state->inode;
3142
3143         p = kmalloc(sizeof(*p), GFP_KERNEL);
3144         if (p == NULL)
3145                 return NULL;
3146         p->arg.fh = NFS_FH(inode);
3147         p->arg.fl = &p->fl;
3148         p->arg.seqid = seqid;
3149         p->res.seqid = seqid;
3150         p->arg.stateid = &lsp->ls_stateid;
3151         p->lsp = lsp;
3152         atomic_inc(&lsp->ls_count);
3153         /* Ensure we don't close file until we're done freeing locks! */
3154         p->ctx = get_nfs_open_context(ctx);
3155         memcpy(&p->fl, fl, sizeof(p->fl));
3156         p->server = NFS_SERVER(inode);
3157         return p;
3158 }
3159
3160 static void nfs4_locku_release_calldata(void *data)
3161 {
3162         struct nfs4_unlockdata *calldata = data;
3163         nfs_free_seqid(calldata->arg.seqid);
3164         nfs4_put_lock_state(calldata->lsp);
3165         put_nfs_open_context(calldata->ctx);
3166         kfree(calldata);
3167 }
3168
3169 static void nfs4_locku_done(struct rpc_task *task, void *data)
3170 {
3171         struct nfs4_unlockdata *calldata = data;
3172
3173         if (RPC_ASSASSINATED(task))
3174                 return;
3175         switch (task->tk_status) {
3176                 case 0:
3177                         memcpy(calldata->lsp->ls_stateid.data,
3178                                         calldata->res.stateid.data,
3179                                         sizeof(calldata->lsp->ls_stateid.data));
3180                         renew_lease(calldata->server, calldata->timestamp);
3181                         break;
3182                 case -NFS4ERR_STALE_STATEID:
3183                 case -NFS4ERR_EXPIRED:
3184                         break;
3185                 default:
3186                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3187                                 rpc_restart_call(task);
3188         }
3189 }
3190
3191 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3192 {
3193         struct nfs4_unlockdata *calldata = data;
3194
3195         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3196                 return;
3197         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3198                 /* Note: exit _without_ running nfs4_locku_done */
3199                 task->tk_action = NULL;
3200                 return;
3201         }
3202         calldata->timestamp = jiffies;
3203         rpc_call_start(task);
3204 }
3205
3206 static const struct rpc_call_ops nfs4_locku_ops = {
3207         .rpc_call_prepare = nfs4_locku_prepare,
3208         .rpc_call_done = nfs4_locku_done,
3209         .rpc_release = nfs4_locku_release_calldata,
3210 };
3211
3212 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3213                 struct nfs_open_context *ctx,
3214                 struct nfs4_lock_state *lsp,
3215                 struct nfs_seqid *seqid)
3216 {
3217         struct nfs4_unlockdata *data;
3218         struct rpc_message msg = {
3219                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3220                 .rpc_cred = ctx->cred,
3221         };
3222         struct rpc_task_setup task_setup_data = {
3223                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3224                 .rpc_message = &msg,
3225                 .callback_ops = &nfs4_locku_ops,
3226                 .workqueue = nfsiod_workqueue,
3227                 .flags = RPC_TASK_ASYNC,
3228         };
3229
3230         /* Ensure this is an unlock - when canceling a lock, the
3231          * canceled lock is passed in, and it won't be an unlock.
3232          */
3233         fl->fl_type = F_UNLCK;
3234
3235         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3236         if (data == NULL) {
3237                 nfs_free_seqid(seqid);
3238                 return ERR_PTR(-ENOMEM);
3239         }
3240
3241         msg.rpc_argp = &data->arg,
3242         msg.rpc_resp = &data->res,
3243         task_setup_data.callback_data = data;
3244         return rpc_run_task(&task_setup_data);
3245 }
3246
3247 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3248 {
3249         struct nfs_seqid *seqid;
3250         struct nfs4_lock_state *lsp;
3251         struct rpc_task *task;
3252         int status = 0;
3253         unsigned char fl_flags = request->fl_flags;
3254
3255         status = nfs4_set_lock_state(state, request);
3256         /* Unlock _before_ we do the RPC call */
3257         request->fl_flags |= FL_EXISTS;
3258         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3259                 goto out;
3260         if (status != 0)
3261                 goto out;
3262         /* Is this a delegated lock? */
3263         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3264                 goto out;
3265         lsp = request->fl_u.nfs4_fl.owner;
3266         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3267         status = -ENOMEM;
3268         if (seqid == NULL)
3269                 goto out;
3270         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3271         status = PTR_ERR(task);
3272         if (IS_ERR(task))
3273                 goto out;
3274         status = nfs4_wait_for_completion_rpc_task(task);
3275         rpc_put_task(task);
3276 out:
3277         request->fl_flags = fl_flags;
3278         return status;
3279 }
3280
3281 struct nfs4_lockdata {
3282         struct nfs_lock_args arg;
3283         struct nfs_lock_res res;
3284         struct nfs4_lock_state *lsp;
3285         struct nfs_open_context *ctx;
3286         struct file_lock fl;
3287         unsigned long timestamp;
3288         int rpc_status;
3289         int cancelled;
3290 };
3291
3292 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3293                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3294 {
3295         struct nfs4_lockdata *p;
3296         struct inode *inode = lsp->ls_state->inode;
3297         struct nfs_server *server = NFS_SERVER(inode);
3298
3299         p = kzalloc(sizeof(*p), GFP_KERNEL);
3300         if (p == NULL)
3301                 return NULL;
3302
3303         p->arg.fh = NFS_FH(inode);
3304         p->arg.fl = &p->fl;
3305         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3306         if (p->arg.open_seqid == NULL)
3307                 goto out_free;
3308         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3309         if (p->arg.lock_seqid == NULL)
3310                 goto out_free_seqid;
3311         p->arg.lock_stateid = &lsp->ls_stateid;
3312         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3313         p->arg.lock_owner.id = lsp->ls_id.id;
3314         p->res.lock_seqid = p->arg.lock_seqid;
3315         p->lsp = lsp;
3316         atomic_inc(&lsp->ls_count);
3317         p->ctx = get_nfs_open_context(ctx);
3318         memcpy(&p->fl, fl, sizeof(p->fl));
3319         return p;
3320 out_free_seqid:
3321         nfs_free_seqid(p->arg.open_seqid);
3322 out_free:
3323         kfree(p);
3324         return NULL;
3325 }
3326
3327 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3328 {
3329         struct nfs4_lockdata *data = calldata;
3330         struct nfs4_state *state = data->lsp->ls_state;
3331
3332         dprintk("%s: begin!\n", __func__);
3333         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3334                 return;
3335         /* Do we need to do an open_to_lock_owner? */
3336         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3337                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3338                         return;
3339                 data->arg.open_stateid = &state->stateid;
3340                 data->arg.new_lock_owner = 1;
3341                 data->res.open_seqid = data->arg.open_seqid;
3342         } else
3343                 data->arg.new_lock_owner = 0;
3344         data->timestamp = jiffies;
3345         rpc_call_start(task);
3346         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3347 }
3348
3349 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3350 {
3351         struct nfs4_lockdata *data = calldata;
3352
3353         dprintk("%s: begin!\n", __func__);
3354
3355         data->rpc_status = task->tk_status;
3356         if (RPC_ASSASSINATED(task))
3357                 goto out;
3358         if (data->arg.new_lock_owner != 0) {
3359                 if (data->rpc_status == 0)
3360                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3361                 else
3362                         goto out;
3363         }
3364         if (data->rpc_status == 0) {
3365                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3366                                         sizeof(data->lsp->ls_stateid.data));
3367                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3368                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3369         }
3370 out:
3371         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3372 }
3373
3374 static void nfs4_lock_release(void *calldata)
3375 {
3376         struct nfs4_lockdata *data = calldata;
3377
3378         dprintk("%s: begin!\n", __func__);
3379         nfs_free_seqid(data->arg.open_seqid);
3380         if (data->cancelled != 0) {
3381                 struct rpc_task *task;
3382                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3383                                 data->arg.lock_seqid);
3384                 if (!IS_ERR(task))
3385                         rpc_put_task(task);
3386                 dprintk("%s: cancelling lock!\n", __func__);
3387         } else
3388                 nfs_free_seqid(data->arg.lock_seqid);
3389         nfs4_put_lock_state(data->lsp);
3390         put_nfs_open_context(data->ctx);
3391         kfree(data);
3392         dprintk("%s: done!\n", __func__);
3393 }
3394
3395 static const struct rpc_call_ops nfs4_lock_ops = {
3396         .rpc_call_prepare = nfs4_lock_prepare,
3397         .rpc_call_done = nfs4_lock_done,
3398         .rpc_release = nfs4_lock_release,
3399 };
3400
3401 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3402 {
3403         struct nfs4_lockdata *data;
3404         struct rpc_task *task;
3405         struct rpc_message msg = {
3406                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3407                 .rpc_cred = state->owner->so_cred,
3408         };
3409         struct rpc_task_setup task_setup_data = {
3410                 .rpc_client = NFS_CLIENT(state->inode),
3411                 .rpc_message = &msg,
3412                 .callback_ops = &nfs4_lock_ops,
3413                 .workqueue = nfsiod_workqueue,
3414                 .flags = RPC_TASK_ASYNC,
3415         };
3416         int ret;
3417
3418         dprintk("%s: begin!\n", __func__);
3419         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3420                         fl->fl_u.nfs4_fl.owner);
3421         if (data == NULL)
3422                 return -ENOMEM;
3423         if (IS_SETLKW(cmd))
3424                 data->arg.block = 1;
3425         if (reclaim != 0)
3426                 data->arg.reclaim = 1;
3427         msg.rpc_argp = &data->arg,
3428         msg.rpc_resp = &data->res,
3429         task_setup_data.callback_data = data;
3430         task = rpc_run_task(&task_setup_data);
3431         if (IS_ERR(task))
3432                 return PTR_ERR(task);
3433         ret = nfs4_wait_for_completion_rpc_task(task);
3434         if (ret == 0) {
3435                 ret = data->rpc_status;
3436                 if (ret == -NFS4ERR_DENIED)
3437                         ret = -EAGAIN;
3438         } else
3439                 data->cancelled = 1;
3440         rpc_put_task(task);
3441         dprintk("%s: done, ret = %d!\n", __func__, ret);
3442         return ret;
3443 }
3444
3445 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3446 {
3447         struct nfs_server *server = NFS_SERVER(state->inode);
3448         struct nfs4_exception exception = { };
3449         int err;
3450
3451         do {
3452                 /* Cache the lock if possible... */
3453                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3454                         return 0;
3455                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3456                 if (err != -NFS4ERR_DELAY)
3457                         break;
3458                 nfs4_handle_exception(server, err, &exception);
3459         } while (exception.retry);
3460         return err;
3461 }
3462
3463 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3464 {
3465         struct nfs_server *server = NFS_SERVER(state->inode);
3466         struct nfs4_exception exception = { };
3467         int err;
3468
3469         err = nfs4_set_lock_state(state, request);
3470         if (err != 0)
3471                 return err;
3472         do {
3473                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3474                         return 0;
3475                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3476                 if (err != -NFS4ERR_DELAY)
3477                         break;
3478                 nfs4_handle_exception(server, err, &exception);
3479         } while (exception.retry);
3480         return err;
3481 }
3482
3483 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3484 {
3485         struct nfs_client *clp = state->owner->so_client;
3486         unsigned char fl_flags = request->fl_flags;
3487         int status;
3488
3489         /* Is this a delegated open? */
3490         status = nfs4_set_lock_state(state, request);
3491         if (status != 0)
3492                 goto out;
3493         request->fl_flags |= FL_ACCESS;
3494         status = do_vfs_lock(request->fl_file, request);
3495         if (status < 0)
3496                 goto out;
3497         down_read(&clp->cl_sem);
3498         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3499                 struct nfs_inode *nfsi = NFS_I(state->inode);
3500                 /* Yes: cache locks! */
3501                 down_read(&nfsi->rwsem);
3502                 /* ...but avoid races with delegation recall... */
3503                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3504                         request->fl_flags = fl_flags & ~FL_SLEEP;
3505                         status = do_vfs_lock(request->fl_file, request);
3506                         up_read(&nfsi->rwsem);
3507                         goto out_unlock;
3508                 }
3509                 up_read(&nfsi->rwsem);
3510         }
3511         status = _nfs4_do_setlk(state, cmd, request, 0);
3512         if (status != 0)
3513                 goto out_unlock;
3514         /* Note: we always want to sleep here! */
3515         request->fl_flags = fl_flags | FL_SLEEP;
3516         if (do_vfs_lock(request->fl_file, request) < 0)
3517                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
3518 out_unlock:
3519         up_read(&clp->cl_sem);
3520 out:
3521         request->fl_flags = fl_flags;
3522         return status;
3523 }
3524
3525 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3526 {
3527         struct nfs4_exception exception = { };
3528         int err;
3529
3530         do {
3531                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3532                                 _nfs4_proc_setlk(state, cmd, request),
3533                                 &exception);
3534         } while (exception.retry);
3535         return err;
3536 }
3537
3538 static int
3539 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3540 {
3541         struct nfs_open_context *ctx;
3542         struct nfs4_state *state;
3543         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3544         int status;
3545
3546         /* verify open state */
3547         ctx = nfs_file_open_context(filp);
3548         state = ctx->state;
3549
3550         if (request->fl_start < 0 || request->fl_end < 0)
3551                 return -EINVAL;
3552
3553         if (IS_GETLK(cmd))
3554                 return nfs4_proc_getlk(state, F_GETLK, request);
3555
3556         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3557                 return -EINVAL;
3558
3559         if (request->fl_type == F_UNLCK)
3560                 return nfs4_proc_unlck(state, cmd, request);
3561
3562         do {
3563                 status = nfs4_proc_setlk(state, cmd, request);
3564                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3565                         break;
3566                 timeout = nfs4_set_lock_task_retry(timeout);
3567                 status = -ERESTARTSYS;
3568                 if (signalled())
3569                         break;
3570         } while(status < 0);
3571         return status;
3572 }
3573
3574 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3575 {
3576         struct nfs_server *server = NFS_SERVER(state->inode);
3577         struct nfs4_exception exception = { };
3578         int err;
3579
3580         err = nfs4_set_lock_state(state, fl);
3581         if (err != 0)
3582                 goto out;
3583         do {
3584                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3585                 if (err != -NFS4ERR_DELAY)
3586                         break;
3587                 err = nfs4_handle_exception(server, err, &exception);
3588         } while (exception.retry);
3589 out:
3590         return err;
3591 }
3592
3593 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3594
3595 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3596                 size_t buflen, int flags)
3597 {
3598         struct inode *inode = dentry->d_inode;
3599
3600         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3601                 return -EOPNOTSUPP;
3602
3603         return nfs4_proc_set_acl(inode, buf, buflen);
3604 }
3605
3606 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3607  * and that's what we'll do for e.g. user attributes that haven't been set.
3608  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3609  * attributes in kernel-managed attribute namespaces. */
3610 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3611                 size_t buflen)
3612 {
3613         struct inode *inode = dentry->d_inode;
3614
3615         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3616                 return -EOPNOTSUPP;
3617
3618         return nfs4_proc_get_acl(inode, buf, buflen);
3619 }
3620
3621 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3622 {
3623         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3624
3625         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3626                 return 0;
3627         if (buf && buflen < len)
3628                 return -ERANGE;
3629         if (buf)
3630                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3631         return len;
3632 }
3633
3634 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3635                 struct nfs4_fs_locations *fs_locations, struct page *page)
3636 {
3637         struct nfs_server *server = NFS_SERVER(dir);
3638         u32 bitmask[2] = {
3639                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3640                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3641         };
3642         struct nfs4_fs_locations_arg args = {
3643                 .dir_fh = NFS_FH(dir),
3644                 .name = name,
3645                 .page = page,
3646                 .bitmask = bitmask,
3647         };
3648         struct rpc_message msg = {
3649                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3650                 .rpc_argp = &args,
3651                 .rpc_resp = fs_locations,
3652         };
3653         int status;
3654
3655         dprintk("%s: start\n", __func__);
3656         nfs_fattr_init(&fs_locations->fattr);
3657         fs_locations->server = server;
3658         fs_locations->nlocations = 0;
3659         status = rpc_call_sync(server->client, &msg, 0);
3660         dprintk("%s: returned status = %d\n", __func__, status);
3661         return status;
3662 }
3663
3664 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3665         .recover_open   = nfs4_open_reclaim,
3666         .recover_lock   = nfs4_lock_reclaim,
3667 };
3668
3669 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3670         .recover_open   = nfs4_open_expired,
3671         .recover_lock   = nfs4_lock_expired,
3672 };
3673
3674 static const struct inode_operations nfs4_file_inode_operations = {
3675         .permission     = nfs_permission,
3676         .getattr        = nfs_getattr,
3677         .setattr        = nfs_setattr,
3678         .getxattr       = nfs4_getxattr,
3679         .setxattr       = nfs4_setxattr,
3680         .listxattr      = nfs4_listxattr,
3681 };
3682
3683 const struct nfs_rpc_ops nfs_v4_clientops = {
3684         .version        = 4,                    /* protocol version */
3685         .dentry_ops     = &nfs4_dentry_operations,
3686         .dir_inode_ops  = &nfs4_dir_inode_operations,
3687         .file_inode_ops = &nfs4_file_inode_operations,
3688         .getroot        = nfs4_proc_get_root,
3689         .getattr        = nfs4_proc_getattr,
3690         .setattr        = nfs4_proc_setattr,
3691         .lookupfh       = nfs4_proc_lookupfh,
3692         .lookup         = nfs4_proc_lookup,
3693         .access         = nfs4_proc_access,
3694         .readlink       = nfs4_proc_readlink,
3695         .create         = nfs4_proc_create,
3696         .remove         = nfs4_proc_remove,
3697         .unlink_setup   = nfs4_proc_unlink_setup,
3698         .unlink_done    = nfs4_proc_unlink_done,
3699         .rename         = nfs4_proc_rename,
3700         .link           = nfs4_proc_link,
3701         .symlink        = nfs4_proc_symlink,
3702         .mkdir          = nfs4_proc_mkdir,
3703         .rmdir          = nfs4_proc_remove,
3704         .readdir        = nfs4_proc_readdir,
3705         .mknod          = nfs4_proc_mknod,
3706         .statfs         = nfs4_proc_statfs,
3707         .fsinfo         = nfs4_proc_fsinfo,
3708         .pathconf       = nfs4_proc_pathconf,
3709         .set_capabilities = nfs4_server_capabilities,
3710         .decode_dirent  = nfs4_decode_dirent,
3711         .read_setup     = nfs4_proc_read_setup,
3712         .read_done      = nfs4_read_done,
3713         .write_setup    = nfs4_proc_write_setup,
3714         .write_done     = nfs4_write_done,
3715         .commit_setup   = nfs4_proc_commit_setup,
3716         .commit_done    = nfs4_commit_done,
3717         .lock           = nfs4_proc_lock,
3718         .clear_acl_cache = nfs4_zap_acl_attr,
3719 };
3720
3721 /*
3722  * Local variables:
3723  *  c-basic-offset: 8
3724  * End:
3725  */