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                 lock_kernel();
 455                 ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
 456                 unlock_kernel();
 457                 if (ret != 0)
 458                         goto out;
 459                 ret = -EAGAIN;
 460                 rcu_read_lock();
 461                 delegation = rcu_dereference(nfsi->delegation);
 462                 /* If no delegation, try a cached open */
 463                 if (delegation == NULL)
 464                         continue;
 465                 /* Is the delegation still valid? */
 466                 if (memcmp(stateid.data, delegation->stateid.data, sizeof(stateid.data)) != 0)
 467                         continue;
 468                 rcu_read_unlock();
 469                 update_open_stateid(state, NULL, &stateid, open_mode);
 470                 goto out_return_state;
 471         }
 472         rcu_read_unlock();
 473 out:
 474         return ERR_PTR(ret);
 475 out_return_state:
 476         atomic_inc(&state->count);
 477         return state;
 478 }
 479
 480 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 481 {
 482         struct inode *inode;
 483         struct nfs4_state *state = NULL;
 484         struct nfs_delegation *delegation;
 485         nfs4_stateid *deleg_stateid = NULL;
 486         int ret;
 487
 488         if (!data->rpc_done) {
 489                 state = nfs4_try_open_cached(data);
 490                 goto out;
 491         }
 492
 493         ret = -EAGAIN;
 494         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 495                 goto err;
 496         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 497         ret = PTR_ERR(inode);
 498         if (IS_ERR(inode))
 499                 goto err;
 500         ret = -ENOMEM;
 501         state = nfs4_get_open_state(inode, data->owner);
 502         if (state == NULL)
 503                 goto err_put_inode;
 504         if (data->o_res.delegation_type != 0) {
 505                 int delegation_flags = 0;
 506
 507                 rcu_read_lock();
 508                 delegation = rcu_dereference(NFS_I(inode)->delegation);
 509                 if (delegation)
 510                         delegation_flags = delegation->flags;
 511                 rcu_read_unlock();
 512                 if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 513                         nfs_inode_set_delegation(state->inode,
 514                                         data->owner->so_cred,
 515                                         &data->o_res);
 516                 else
 517                         nfs_inode_reclaim_delegation(state->inode,
 518                                         data->owner->so_cred,
 519                                         &data->o_res);
 520         }
 521         rcu_read_lock();
 522         delegation = rcu_dereference(NFS_I(inode)->delegation);
 523         if (delegation != NULL)
 524                 deleg_stateid = &delegation->stateid;
 525         update_open_stateid(state, &data->o_res.stateid, deleg_stateid, data->o_arg.open_flags);
 526         rcu_read_unlock();
 527         iput(inode);
 528 out:
 529         return state;
 530 err_put_inode:
 531         iput(inode);
 532 err:
 533         return ERR_PTR(ret);
 534 }
 535
 536 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 537 {
 538         struct nfs_inode *nfsi = NFS_I(state->inode);
 539         struct nfs_open_context *ctx;
 540
 541         spin_lock(&state->inode->i_lock);
 542         list_for_each_entry(ctx, &nfsi->open_files, list) {
 543                 if (ctx->state != state)
 544                         continue;
 545                 get_nfs_open_context(ctx);
 546                 spin_unlock(&state->inode->i_lock);
 547                 return ctx;
 548         }
 549         spin_unlock(&state->inode->i_lock);
 550         return ERR_PTR(-ENOENT);
 551 }
 552
 553 static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx, struct nfs4_state *state)
 554 {
 555         struct nfs4_opendata *opendata;
 556
 557         opendata = nfs4_opendata_alloc(&ctx->path, state->owner, 0, NULL);
 558         if (opendata == NULL)
 559                 return ERR_PTR(-ENOMEM);
 560         opendata->state = state;
 561         atomic_inc(&state->count);
 562         return opendata;
 563 }
 564
 565 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, struct nfs4_state **res)
 566 {
 567         struct nfs4_state *newstate;
 568         int ret;
 569
 570         opendata->o_arg.open_flags = openflags;
 571         memset(&opendata->o_res, 0, sizeof(opendata->o_res));
 572         memset(&opendata->c_res, 0, sizeof(opendata->c_res));
 573         nfs4_init_opendata_res(opendata);
 574         ret = _nfs4_proc_open(opendata);
 575         if (ret != 0)
 576                 return ret;
 577         newstate = nfs4_opendata_to_nfs4_state(opendata);
 578         if (IS_ERR(newstate))
 579                 return PTR_ERR(newstate);
 580         nfs4_close_state(&opendata->path, newstate, openflags);
 581         *res = newstate;
 582         return 0;
 583 }
 584
 585 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 586 {
 587         struct nfs4_state *newstate;
 588         int ret;
 589
 590         /* memory barrier prior to reading state->n_* */
 591         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 592         smp_rmb();
 593         if (state->n_rdwr != 0) {
 594                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &newstate);
 595                 if (ret != 0)
 596                         return ret;
 597                 if (newstate != state)
 598                         return -ESTALE;
 599         }
 600         if (state->n_wronly != 0) {
 601                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &newstate);
 602                 if (ret != 0)
 603                         return ret;
 604                 if (newstate != state)
 605                         return -ESTALE;
 606         }
 607         if (state->n_rdonly != 0) {
 608                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &newstate);
 609                 if (ret != 0)
 610                         return ret;
 611                 if (newstate != state)
 612                         return -ESTALE;
 613         }
 614         /*
 615          * We may have performed cached opens for all three recoveries.
 616          * Check if we need to update the current stateid.
 617          */
 618         if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
 619             memcmp(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data)) != 0) {
 620                 write_seqlock(&state->seqlock);
 621                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
 622                         memcpy(state->stateid.data, state->open_stateid.data, sizeof(state->stateid.data));
 623                 write_sequnlock(&state->seqlock);
 624         }
 625         return 0;
 626 }
 627
 628 /*
 629  * OPEN_RECLAIM:
 630  *      reclaim state on the server after a reboot.
 631  */
 632 static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 633 {
 634         struct nfs_delegation *delegation;
 635         struct nfs4_opendata *opendata;
 636         int delegation_type = 0;
 637         int status;
 638
 639         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 640         if (IS_ERR(opendata))
 641                 return PTR_ERR(opendata);
 642         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 643         opendata->o_arg.fh = NFS_FH(state->inode);
 644         rcu_read_lock();
 645         delegation = rcu_dereference(NFS_I(state->inode)->delegation);
 646         if (delegation != NULL && (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) != 0)
 647                 delegation_type = delegation->type;
 648         rcu_read_unlock();
 649         opendata->o_arg.u.delegation_type = delegation_type;
 650         status = nfs4_open_recover(opendata, state);
 651         nfs4_opendata_put(opendata);
 652         return status;
 653 }
 654
 655 static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
 656 {
 657         struct nfs_server *server = NFS_SERVER(state->inode);
 658         struct nfs4_exception exception = { };
 659         int err;
 660         do {
 661                 err = _nfs4_do_open_reclaim(ctx, state);
 662                 if (err != -NFS4ERR_DELAY)
 663                         break;
 664                 nfs4_handle_exception(server, err, &exception);
 665         } while (exception.retry);
 666         return err;
 667 }
 668
 669 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 670 {
 671         struct nfs_open_context *ctx;
 672         int ret;
 673
 674         ctx = nfs4_state_find_open_context(state);
 675         if (IS_ERR(ctx))
 676                 return PTR_ERR(ctx);
 677         ret = nfs4_do_open_reclaim(ctx, state);
 678         put_nfs_open_context(ctx);
 679         return ret;
 680 }
 681
 682 static int _nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 683 {
 684         struct nfs4_opendata *opendata;
 685         int ret;
 686
 687         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 688         if (IS_ERR(opendata))
 689                 return PTR_ERR(opendata);
 690         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 691         memcpy(opendata->o_arg.u.delegation.data, stateid->data,
 692                         sizeof(opendata->o_arg.u.delegation.data));
 693         ret = nfs4_open_recover(opendata, state);
 694         nfs4_opendata_put(opendata);
 695         return ret;
 696 }
 697
 698 int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state *state, const nfs4_stateid *stateid)
 699 {
 700         struct nfs4_exception exception = { };
 701         struct nfs_server *server = NFS_SERVER(state->inode);
 702         int err;
 703         do {
 704                 err = _nfs4_open_delegation_recall(ctx, state, stateid);
 705                 switch (err) {
 706                         case 0:
 707                                 return err;
 708                         case -NFS4ERR_STALE_CLIENTID:
 709                         case -NFS4ERR_STALE_STATEID:
 710                         case -NFS4ERR_EXPIRED:
 711                                 /* Don't recall a delegation if it was lost */
 712                                 nfs4_schedule_state_recovery(server->nfs_client);
 713                                 return err;
 714                 }
 715                 err = nfs4_handle_exception(server, err, &exception);
 716         } while (exception.retry);
 717         return err;
 718 }
 719
 720 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 721 {
 722         struct nfs4_opendata *data = calldata;
 723
 724         data->rpc_status = task->tk_status;
 725         if (RPC_ASSASSINATED(task))
 726                 return;
 727         if (data->rpc_status == 0) {
 728                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 729                                 sizeof(data->o_res.stateid.data));
 730                 nfs_confirm_seqid(&data->owner->so_seqid, 0);
 731                 renew_lease(data->o_res.server, data->timestamp);
 732                 data->rpc_done = 1;
 733         }
 734 }
 735
 736 static void nfs4_open_confirm_release(void *calldata)
 737 {
 738         struct nfs4_opendata *data = calldata;
 739         struct nfs4_state *state = NULL;
 740
 741         /* If this request hasn't been cancelled, do nothing */
 742         if (data->cancelled == 0)
 743                 goto out_free;
 744         /* In case of error, no cleanup! */
 745         if (!data->rpc_done)
 746                 goto out_free;
 747         state = nfs4_opendata_to_nfs4_state(data);
 748         if (!IS_ERR(state))
 749                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 750 out_free:
 751         nfs4_opendata_put(data);
 752 }
 753
 754 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 755         .rpc_call_done = nfs4_open_confirm_done,
 756         .rpc_release = nfs4_open_confirm_release,
 757 };
 758
 759 /*
 760  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 761  */
 762 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 763 {
 764         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 765         struct rpc_task *task;
 766         struct  rpc_message msg = {
 767                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 768                 .rpc_argp = &data->c_arg,
 769                 .rpc_resp = &data->c_res,
 770                 .rpc_cred = data->owner->so_cred,
 771         };
 772         struct rpc_task_setup task_setup_data = {
 773                 .rpc_client = server->client,
 774                 .rpc_message = &msg,
 775                 .callback_ops = &nfs4_open_confirm_ops,
 776                 .callback_data = data,
 777                 .workqueue = nfsiod_workqueue,
 778                 .flags = RPC_TASK_ASYNC,
 779         };
 780         int status;
 781
 782         kref_get(&data->kref);
 783         data->rpc_done = 0;
 784         data->rpc_status = 0;
 785         data->timestamp = jiffies;
 786         task = rpc_run_task(&task_setup_data);
 787         if (IS_ERR(task))
 788                 return PTR_ERR(task);
 789         status = nfs4_wait_for_completion_rpc_task(task);
 790         if (status != 0) {
 791                 data->cancelled = 1;
 792                 smp_wmb();
 793         } else
 794                 status = data->rpc_status;
 795         rpc_put_task(task);
 796         return status;
 797 }
 798
 799 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 800 {
 801         struct nfs4_opendata *data = calldata;
 802         struct nfs4_state_owner *sp = data->owner;
 803
 804         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 805                 return;
 806         /*
 807          * Check if we still need to send an OPEN call, or if we can use
 808          * a delegation instead.
 809          */
 810         if (data->state != NULL) {
 811                 struct nfs_delegation *delegation;
 812
 813                 if (can_open_cached(data->state, data->o_arg.open_flags & (FMODE_READ|FMODE_WRITE|O_EXCL)))
 814                         goto out_no_action;
 815                 rcu_read_lock();
 816                 delegation = rcu_dereference(NFS_I(data->state->inode)->delegation);
 817                 if (delegation != NULL &&
 818                    (delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) {
 819                         rcu_read_unlock();
 820                         goto out_no_action;
 821                 }
 822                 rcu_read_unlock();
 823         }
 824         /* Update sequence id. */
 825         data->o_arg.id = sp->so_owner_id.id;
 826         data->o_arg.clientid = sp->so_client->cl_clientid;
 827         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) {
 828                 task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 829                 nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
 830         }
 831         data->timestamp = jiffies;
 832         rpc_call_start(task);
 833         return;
 834 out_no_action:
 835         task->tk_action = NULL;
 836
 837 }
 838
 839 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 840 {
 841         struct nfs4_opendata *data = calldata;
 842
 843         data->rpc_status = task->tk_status;
 844         if (RPC_ASSASSINATED(task))
 845                 return;
 846         if (task->tk_status == 0) {
 847                 switch (data->o_res.f_attr->mode & S_IFMT) {
 848                         case S_IFREG:
 849                                 break;
 850                         case S_IFLNK:
 851                                 data->rpc_status = -ELOOP;
 852                                 break;
 853                         case S_IFDIR:
 854                                 data->rpc_status = -EISDIR;
 855                                 break;
 856                         default:
 857                                 data->rpc_status = -ENOTDIR;
 858                 }
 859                 renew_lease(data->o_res.server, data->timestamp);
 860                 if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
 861                         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 862         }
 863         data->rpc_done = 1;
 864 }
 865
 866 static void nfs4_open_release(void *calldata)
 867 {
 868         struct nfs4_opendata *data = calldata;
 869         struct nfs4_state *state = NULL;
 870
 871         /* If this request hasn't been cancelled, do nothing */
 872         if (data->cancelled == 0)
 873                 goto out_free;
 874         /* In case of error, no cleanup! */
 875         if (data->rpc_status != 0 || !data->rpc_done)
 876                 goto out_free;
 877         /* In case we need an open_confirm, no cleanup! */
 878         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 879                 goto out_free;
 880         state = nfs4_opendata_to_nfs4_state(data);
 881         if (!IS_ERR(state))
 882                 nfs4_close_state(&data->path, state, data->o_arg.open_flags);
 883 out_free:
 884         nfs4_opendata_put(data);
 885 }
 886
 887 static const struct rpc_call_ops nfs4_open_ops = {
 888         .rpc_call_prepare = nfs4_open_prepare,
 889         .rpc_call_done = nfs4_open_done,
 890         .rpc_release = nfs4_open_release,
 891 };
 892
 893 /*
 894  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 895  */
 896 static int _nfs4_proc_open(struct nfs4_opendata *data)
 897 {
 898         struct inode *dir = data->dir->d_inode;
 899         struct nfs_server *server = NFS_SERVER(dir);
 900         struct nfs_openargs *o_arg = &data->o_arg;
 901         struct nfs_openres *o_res = &data->o_res;
 902         struct rpc_task *task;
 903         struct rpc_message msg = {
 904                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 905                 .rpc_argp = o_arg,
 906                 .rpc_resp = o_res,
 907                 .rpc_cred = data->owner->so_cred,
 908         };
 909         struct rpc_task_setup task_setup_data = {
 910                 .rpc_client = server->client,
 911                 .rpc_message = &msg,
 912                 .callback_ops = &nfs4_open_ops,
 913                 .callback_data = data,
 914                 .workqueue = nfsiod_workqueue,
 915                 .flags = RPC_TASK_ASYNC,
 916         };
 917         int status;
 918
 919         kref_get(&data->kref);
 920         data->rpc_done = 0;
 921         data->rpc_status = 0;
 922         data->cancelled = 0;
 923         task = rpc_run_task(&task_setup_data);
 924         if (IS_ERR(task))
 925                 return PTR_ERR(task);
 926         status = nfs4_wait_for_completion_rpc_task(task);
 927         if (status != 0) {
 928                 data->cancelled = 1;
 929                 smp_wmb();
 930         } else
 931                 status = data->rpc_status;
 932         rpc_put_task(task);
 933         if (status != 0 || !data->rpc_done)
 934                 return status;
 935
 936         if (o_res->fh.size == 0)
 937                 _nfs4_proc_lookup(dir, o_arg->name, &o_res->fh, o_res->f_attr);
 938
 939         if (o_arg->open_flags & O_CREAT) {
 940                 update_changeattr(dir, &o_res->cinfo);
 941                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 942         } else
 943                 nfs_refresh_inode(dir, o_res->dir_attr);
 944         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 945                 status = _nfs4_proc_open_confirm(data);
 946                 if (status != 0)
 947                         return status;
 948         }
 949         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 950                 _nfs4_proc_getattr(server, &o_res->fh, o_res->f_attr);
 951         return 0;
 952 }
 953
 954 static int nfs4_recover_expired_lease(struct nfs_server *server)
 955 {
 956         struct nfs_client *clp = server->nfs_client;
 957         int ret;
 958
 959         for (;;) {
 960                 ret = nfs4_wait_clnt_recover(server->client, clp);
 961                 if (ret != 0)
 962                         return ret;
 963                 if (!test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 964                         break;
 965                 nfs4_schedule_state_recovery(clp);
 966         }
 967         return 0;
 968 }
 969
 970 /*
 971  * OPEN_EXPIRED:
 972  *      reclaim state on the server after a network partition.
 973  *      Assumes caller holds the appropriate lock
 974  */
 975 static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 976 {
 977         struct nfs4_opendata *opendata;
 978         int ret;
 979
 980         opendata = nfs4_open_recoverdata_alloc(ctx, state);
 981         if (IS_ERR(opendata))
 982                 return PTR_ERR(opendata);
 983         ret = nfs4_open_recover(opendata, state);
 984         if (ret == -ESTALE)
 985                 d_drop(ctx->path.dentry);
 986         nfs4_opendata_put(opendata);
 987         return ret;
 988 }
 989
 990 static inline int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
 991 {
 992         struct nfs_server *server = NFS_SERVER(state->inode);
 993         struct nfs4_exception exception = { };
 994         int err;
 995
 996         do {
 997                 err = _nfs4_open_expired(ctx, state);
 998                 if (err == -NFS4ERR_DELAY)
 999                         nfs4_handle_exception(server, err, &exception);
1000         } while (exception.retry);
1001         return err;
1002 }
1003
1004 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
1005 {
1006         struct nfs_open_context *ctx;
1007         int ret;
1008
1009         ctx = nfs4_state_find_open_context(state);
1010         if (IS_ERR(ctx))
1011                 return PTR_ERR(ctx);
1012         ret = nfs4_do_open_expired(ctx, state);
1013         put_nfs_open_context(ctx);
1014         return ret;
1015 }
1016
1017 /*
1018  * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
1019  * fields corresponding to attributes that were used to store the verifier.
1020  * Make sure we clobber those fields in the later setattr call
1021  */
1022 static inline void nfs4_exclusive_attrset(struct nfs4_opendata *opendata, struct iattr *sattr)
1023 {
1024         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_ACCESS) &&
1025             !(sattr->ia_valid & ATTR_ATIME_SET))
1026                 sattr->ia_valid |= ATTR_ATIME;
1027
1028         if ((opendata->o_res.attrset[1] & FATTR4_WORD1_TIME_MODIFY) &&
1029             !(sattr->ia_valid & ATTR_MTIME_SET))
1030                 sattr->ia_valid |= ATTR_MTIME;
1031 }
1032
1033 /*
1034  * Returns a referenced nfs4_state
1035  */
1036 static int _nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
1037 {
1038         struct nfs4_state_owner  *sp;
1039         struct nfs4_state     *state = NULL;
1040         struct nfs_server       *server = NFS_SERVER(dir);
1041         struct nfs_client *clp = server->nfs_client;
1042         struct nfs4_opendata *opendata;
1043         int status;
1044
1045         /* Protect against reboot recovery conflicts */
1046         status = -ENOMEM;
1047         if (!(sp = nfs4_get_state_owner(server, cred))) {
1048                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
1049                 goto out_err;
1050         }
1051         status = nfs4_recover_expired_lease(server);
1052         if (status != 0)
1053                 goto err_put_state_owner;
1054         if (path->dentry->d_inode != NULL)
1055                 nfs4_return_incompatible_delegation(path->dentry->d_inode, flags & (FMODE_READ|FMODE_WRITE));
1056         down_read(&clp->cl_sem);
1057         status = -ENOMEM;
1058         opendata = nfs4_opendata_alloc(path, sp, flags, sattr);
1059         if (opendata == NULL)
1060                 goto err_release_rwsem;
1061
1062         if (path->dentry->d_inode != NULL)
1063                 opendata->state = nfs4_get_open_state(path->dentry->d_inode, sp);
1064
1065         status = _nfs4_proc_open(opendata);
1066         if (status != 0)
1067                 goto err_opendata_put;
1068
1069         if (opendata->o_arg.open_flags & O_EXCL)
1070                 nfs4_exclusive_attrset(opendata, sattr);
1071
1072         state = nfs4_opendata_to_nfs4_state(opendata);
1073         status = PTR_ERR(state);
1074         if (IS_ERR(state))
1075                 goto err_opendata_put;
1076         nfs4_opendata_put(opendata);
1077         nfs4_put_state_owner(sp);
1078         up_read(&clp->cl_sem);
1079         *res = state;
1080         return 0;
1081 err_opendata_put:
1082         nfs4_opendata_put(opendata);
1083 err_release_rwsem:
1084         up_read(&clp->cl_sem);
1085 err_put_state_owner:
1086         nfs4_put_state_owner(sp);
1087 out_err:
1088         *res = NULL;
1089         return status;
1090 }
1091
1092
1093 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct path *path, int flags, struct iattr *sattr, struct rpc_cred *cred)
1094 {
1095         struct nfs4_exception exception = { };
1096         struct nfs4_state *res;
1097         int status;
1098
1099         do {
1100                 status = _nfs4_do_open(dir, path, flags, sattr, cred, &res);
1101                 if (status == 0)
1102                         break;
1103                 /* NOTE: BAD_SEQID means the server and client disagree about the
1104                  * book-keeping w.r.t. state-changing operations
1105                  * (OPEN/CLOSE/LOCK/LOCKU...)
1106                  * It is actually a sign of a bug on the client or on the server.
1107                  *
1108                  * If we receive a BAD_SEQID error in the particular case of
1109                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1110                  * have unhashed the old state_owner for us, and that we can
1111                  * therefore safely retry using a new one. We should still warn
1112                  * the user though...
1113                  */
1114                 if (status == -NFS4ERR_BAD_SEQID) {
1115                         printk(KERN_WARNING "NFS: v4 server %s "
1116                                         " returned a bad sequence-id error!\n",
1117                                         NFS_SERVER(dir)->nfs_client->cl_hostname);
1118                         exception.retry = 1;
1119                         continue;
1120                 }
1121                 /*
1122                  * BAD_STATEID on OPEN means that the server cancelled our
1123                  * state before it received the OPEN_CONFIRM.
1124                  * Recover by retrying the request as per the discussion
1125                  * on Page 181 of RFC3530.
1126                  */
1127                 if (status == -NFS4ERR_BAD_STATEID) {
1128                         exception.retry = 1;
1129                         continue;
1130                 }
1131                 if (status == -EAGAIN) {
1132                         /* We must have found a delegation */
1133                         exception.retry = 1;
1134                         continue;
1135                 }
1136                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1137                                         status, &exception));
1138         } while (exception.retry);
1139         return res;
1140 }
1141
1142 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1143                 struct iattr *sattr, struct nfs4_state *state)
1144 {
1145         struct nfs_server *server = NFS_SERVER(inode);
1146         struct nfs_setattrargs  arg = {
1147                 .fh             = NFS_FH(inode),
1148                 .iap            = sattr,
1149                 .server         = server,
1150                 .bitmask = server->attr_bitmask,
1151         };
1152         struct nfs_setattrres  res = {
1153                 .fattr          = fattr,
1154                 .server         = server,
1155         };
1156         struct rpc_message msg = {
1157                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1158                 .rpc_argp       = &arg,
1159                 .rpc_resp       = &res,
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                 msg.rpc_cred = state->owner->so_cred;
1170                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1171         } else
1172                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1173
1174         status = rpc_call_sync(server->client, &msg, 0);
1175         if (status == 0 && state != NULL)
1176                 renew_lease(server, timestamp);
1177         return status;
1178 }
1179
1180 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1181                 struct iattr *sattr, 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, 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 rpc_cred *cred;
1651         struct inode *inode = dentry->d_inode;
1652         struct nfs_open_context *ctx;
1653         struct nfs4_state *state = NULL;
1654         int status;
1655
1656         nfs_fattr_init(fattr);
1657
1658         cred = rpc_lookup_cred();
1659         if (IS_ERR(cred))
1660                 return PTR_ERR(cred);
1661
1662         /* Search for an existing open(O_WRITE) file */
1663         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1664         if (ctx != NULL)
1665                 state = ctx->state;
1666
1667         status = nfs4_do_setattr(inode, fattr, sattr, state);
1668         if (status == 0)
1669                 nfs_setattr_update_inode(inode, sattr);
1670         if (ctx != NULL)
1671                 put_nfs_open_context(ctx);
1672         put_rpccred(cred);
1673         return status;
1674 }
1675
1676 static int _nfs4_proc_lookupfh(struct nfs_server *server, const struct nfs_fh *dirfh,
1677                 const struct qstr *name, struct nfs_fh *fhandle,
1678                 struct nfs_fattr *fattr)
1679 {
1680         int                    status;
1681         struct nfs4_lookup_arg args = {
1682                 .bitmask = server->attr_bitmask,
1683                 .dir_fh = dirfh,
1684                 .name = name,
1685         };
1686         struct nfs4_lookup_res res = {
1687                 .server = server,
1688                 .fattr = fattr,
1689                 .fh = fhandle,
1690         };
1691         struct rpc_message msg = {
1692                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1693                 .rpc_argp = &args,
1694                 .rpc_resp = &res,
1695         };
1696
1697         nfs_fattr_init(fattr);
1698
1699         dprintk("NFS call  lookupfh %s\n", name->name);
1700         status = rpc_call_sync(server->client, &msg, 0);
1701         dprintk("NFS reply lookupfh: %d\n", status);
1702         return status;
1703 }
1704
1705 static int nfs4_proc_lookupfh(struct nfs_server *server, struct nfs_fh *dirfh,
1706                               struct qstr *name, struct nfs_fh *fhandle,
1707                               struct nfs_fattr *fattr)
1708 {
1709         struct nfs4_exception exception = { };
1710         int err;
1711         do {
1712                 err = _nfs4_proc_lookupfh(server, dirfh, name, fhandle, fattr);
1713                 /* FIXME: !!!! */
1714                 if (err == -NFS4ERR_MOVED) {
1715                         err = -EREMOTE;
1716                         break;
1717                 }
1718                 err = nfs4_handle_exception(server, err, &exception);
1719         } while (exception.retry);
1720         return err;
1721 }
1722
1723 static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name,
1724                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1725 {
1726         int status;
1727
1728         dprintk("NFS call  lookup %s\n", name->name);
1729         status = _nfs4_proc_lookupfh(NFS_SERVER(dir), NFS_FH(dir), name, fhandle, fattr);
1730         if (status == -NFS4ERR_MOVED)
1731                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1732         dprintk("NFS reply lookup: %d\n", status);
1733         return status;
1734 }
1735
1736 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1737 {
1738         struct nfs4_exception exception = { };
1739         int err;
1740         do {
1741                 err = nfs4_handle_exception(NFS_SERVER(dir),
1742                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1743                                 &exception);
1744         } while (exception.retry);
1745         return err;
1746 }
1747
1748 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1749 {
1750         struct nfs_server *server = NFS_SERVER(inode);
1751         struct nfs_fattr fattr;
1752         struct nfs4_accessargs args = {
1753                 .fh = NFS_FH(inode),
1754                 .bitmask = server->attr_bitmask,
1755         };
1756         struct nfs4_accessres res = {
1757                 .server = server,
1758                 .fattr = &fattr,
1759         };
1760         struct rpc_message msg = {
1761                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1762                 .rpc_argp = &args,
1763                 .rpc_resp = &res,
1764                 .rpc_cred = entry->cred,
1765         };
1766         int mode = entry->mask;
1767         int status;
1768
1769         /*
1770          * Determine which access bits we want to ask for...
1771          */
1772         if (mode & MAY_READ)
1773                 args.access |= NFS4_ACCESS_READ;
1774         if (S_ISDIR(inode->i_mode)) {
1775                 if (mode & MAY_WRITE)
1776                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1777                 if (mode & MAY_EXEC)
1778                         args.access |= NFS4_ACCESS_LOOKUP;
1779         } else {
1780                 if (mode & MAY_WRITE)
1781                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1782                 if (mode & MAY_EXEC)
1783                         args.access |= NFS4_ACCESS_EXECUTE;
1784         }
1785         nfs_fattr_init(&fattr);
1786         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1787         if (!status) {
1788                 entry->mask = 0;
1789                 if (res.access & NFS4_ACCESS_READ)
1790                         entry->mask |= MAY_READ;
1791                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1792                         entry->mask |= MAY_WRITE;
1793                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1794                         entry->mask |= MAY_EXEC;
1795                 nfs_refresh_inode(inode, &fattr);
1796         }
1797         return status;
1798 }
1799
1800 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1801 {
1802         struct nfs4_exception exception = { };
1803         int err;
1804         do {
1805                 err = nfs4_handle_exception(NFS_SERVER(inode),
1806                                 _nfs4_proc_access(inode, entry),
1807                                 &exception);
1808         } while (exception.retry);
1809         return err;
1810 }
1811
1812 /*
1813  * TODO: For the time being, we don't try to get any attributes
1814  * along with any of the zero-copy operations READ, READDIR,
1815  * READLINK, WRITE.
1816  *
1817  * In the case of the first three, we want to put the GETATTR
1818  * after the read-type operation -- this is because it is hard
1819  * to predict the length of a GETATTR response in v4, and thus
1820  * align the READ data correctly.  This means that the GETATTR
1821  * may end up partially falling into the page cache, and we should
1822  * shift it into the 'tail' of the xdr_buf before processing.
1823  * To do this efficiently, we need to know the total length
1824  * of data received, which doesn't seem to be available outside
1825  * of the RPC layer.
1826  *
1827  * In the case of WRITE, we also want to put the GETATTR after
1828  * the operation -- in this case because we want to make sure
1829  * we get the post-operation mtime and size.  This means that
1830  * we can't use xdr_encode_pages() as written: we need a variant
1831  * of it which would leave room in the 'tail' iovec.
1832  *
1833  * Both of these changes to the XDR layer would in fact be quite
1834  * minor, but I decided to leave them for a subsequent patch.
1835  */
1836 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1837                 unsigned int pgbase, unsigned int pglen)
1838 {
1839         struct nfs4_readlink args = {
1840                 .fh       = NFS_FH(inode),
1841                 .pgbase   = pgbase,
1842                 .pglen    = pglen,
1843                 .pages    = &page,
1844         };
1845         struct rpc_message msg = {
1846                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1847                 .rpc_argp = &args,
1848                 .rpc_resp = NULL,
1849         };
1850
1851         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1852 }
1853
1854 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1855                 unsigned int pgbase, unsigned int pglen)
1856 {
1857         struct nfs4_exception exception = { };
1858         int err;
1859         do {
1860                 err = nfs4_handle_exception(NFS_SERVER(inode),
1861                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1862                                 &exception);
1863         } while (exception.retry);
1864         return err;
1865 }
1866
1867 /*
1868  * Got race?
1869  * We will need to arrange for the VFS layer to provide an atomic open.
1870  * Until then, this create/open method is prone to inefficiency and race
1871  * conditions due to the lookup, create, and open VFS calls from sys_open()
1872  * placed on the wire.
1873  *
1874  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1875  * The file will be opened again in the subsequent VFS open call
1876  * (nfs4_proc_file_open).
1877  *
1878  * The open for read will just hang around to be used by any process that
1879  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1880  */
1881
1882 static int
1883 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1884                  int flags, struct nameidata *nd)
1885 {
1886         struct path path = {
1887                 .mnt = nd->path.mnt,
1888                 .dentry = dentry,
1889         };
1890         struct nfs4_state *state;
1891         struct rpc_cred *cred;
1892         int status = 0;
1893
1894         cred = rpc_lookup_cred();
1895         if (IS_ERR(cred)) {
1896                 status = PTR_ERR(cred);
1897                 goto out;
1898         }
1899         state = nfs4_do_open(dir, &path, flags, sattr, cred);
1900         put_rpccred(cred);
1901         d_drop(dentry);
1902         if (IS_ERR(state)) {
1903                 status = PTR_ERR(state);
1904                 goto out;
1905         }
1906         d_add(dentry, igrab(state->inode));
1907         nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
1908         if (flags & O_EXCL) {
1909                 struct nfs_fattr fattr;
1910                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1911                 if (status == 0)
1912                         nfs_setattr_update_inode(state->inode, sattr);
1913                 nfs_post_op_update_inode(state->inode, &fattr);
1914         }
1915         if (status == 0 && (nd->flags & LOOKUP_OPEN) != 0)
1916                 status = nfs4_intent_set_file(nd, &path, state);
1917         else
1918                 nfs4_close_sync(&path, state, flags);
1919 out:
1920         return status;
1921 }
1922
1923 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1924 {
1925         struct nfs_server *server = NFS_SERVER(dir);
1926         struct nfs_removeargs args = {
1927                 .fh = NFS_FH(dir),
1928                 .name.len = name->len,
1929                 .name.name = name->name,
1930                 .bitmask = server->attr_bitmask,
1931         };
1932         struct nfs_removeres res = {
1933                 .server = server,
1934         };
1935         struct rpc_message msg = {
1936                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1937                 .rpc_argp = &args,
1938                 .rpc_resp = &res,
1939         };
1940         int                     status;
1941
1942         nfs_fattr_init(&res.dir_attr);
1943         status = rpc_call_sync(server->client, &msg, 0);
1944         if (status == 0) {
1945                 update_changeattr(dir, &res.cinfo);
1946                 nfs_post_op_update_inode(dir, &res.dir_attr);
1947         }
1948         return status;
1949 }
1950
1951 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1952 {
1953         struct nfs4_exception exception = { };
1954         int err;
1955         do {
1956                 err = nfs4_handle_exception(NFS_SERVER(dir),
1957                                 _nfs4_proc_remove(dir, name),
1958                                 &exception);
1959         } while (exception.retry);
1960         return err;
1961 }
1962
1963 static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
1964 {
1965         struct nfs_server *server = NFS_SERVER(dir);
1966         struct nfs_removeargs *args = msg->rpc_argp;
1967         struct nfs_removeres *res = msg->rpc_resp;
1968
1969         args->bitmask = server->attr_bitmask;
1970         res->server = server;
1971         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1972 }
1973
1974 static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
1975 {
1976         struct nfs_removeres *res = task->tk_msg.rpc_resp;
1977
1978         if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
1979                 return 0;
1980         update_changeattr(dir, &res->cinfo);
1981         nfs_post_op_update_inode(dir, &res->dir_attr);
1982         return 1;
1983 }
1984
1985 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1986                 struct inode *new_dir, struct qstr *new_name)
1987 {
1988         struct nfs_server *server = NFS_SERVER(old_dir);
1989         struct nfs4_rename_arg arg = {
1990                 .old_dir = NFS_FH(old_dir),
1991                 .new_dir = NFS_FH(new_dir),
1992                 .old_name = old_name,
1993                 .new_name = new_name,
1994                 .bitmask = server->attr_bitmask,
1995         };
1996         struct nfs_fattr old_fattr, new_fattr;
1997         struct nfs4_rename_res res = {
1998                 .server = server,
1999                 .old_fattr = &old_fattr,
2000                 .new_fattr = &new_fattr,
2001         };
2002         struct rpc_message msg = {
2003                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2004                 .rpc_argp = &arg,
2005                 .rpc_resp = &res,
2006         };
2007         int                     status;
2008
2009         nfs_fattr_init(res.old_fattr);
2010         nfs_fattr_init(res.new_fattr);
2011         status = rpc_call_sync(server->client, &msg, 0);
2012
2013         if (!status) {
2014                 update_changeattr(old_dir, &res.old_cinfo);
2015                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2016                 update_changeattr(new_dir, &res.new_cinfo);
2017                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2018         }
2019         return status;
2020 }
2021
2022 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2023                 struct inode *new_dir, struct qstr *new_name)
2024 {
2025         struct nfs4_exception exception = { };
2026         int err;
2027         do {
2028                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2029                                 _nfs4_proc_rename(old_dir, old_name,
2030                                         new_dir, new_name),
2031                                 &exception);
2032         } while (exception.retry);
2033         return err;
2034 }
2035
2036 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2037 {
2038         struct nfs_server *server = NFS_SERVER(inode);
2039         struct nfs4_link_arg arg = {
2040                 .fh     = NFS_FH(inode),
2041                 .dir_fh = NFS_FH(dir),
2042                 .name   = name,
2043                 .bitmask = server->attr_bitmask,
2044         };
2045         struct nfs_fattr fattr, dir_attr;
2046         struct nfs4_link_res res = {
2047                 .server = server,
2048                 .fattr = &fattr,
2049                 .dir_attr = &dir_attr,
2050         };
2051         struct rpc_message msg = {
2052                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2053                 .rpc_argp = &arg,
2054                 .rpc_resp = &res,
2055         };
2056         int                     status;
2057
2058         nfs_fattr_init(res.fattr);
2059         nfs_fattr_init(res.dir_attr);
2060         status = rpc_call_sync(server->client, &msg, 0);
2061         if (!status) {
2062                 update_changeattr(dir, &res.cinfo);
2063                 nfs_post_op_update_inode(dir, res.dir_attr);
2064                 nfs_post_op_update_inode(inode, res.fattr);
2065         }
2066
2067         return status;
2068 }
2069
2070 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2071 {
2072         struct nfs4_exception exception = { };
2073         int err;
2074         do {
2075                 err = nfs4_handle_exception(NFS_SERVER(inode),
2076                                 _nfs4_proc_link(inode, dir, name),
2077                                 &exception);
2078         } while (exception.retry);
2079         return err;
2080 }
2081
2082 static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2083                 struct page *page, unsigned int len, struct iattr *sattr)
2084 {
2085         struct nfs_server *server = NFS_SERVER(dir);
2086         struct nfs_fh fhandle;
2087         struct nfs_fattr fattr, dir_fattr;
2088         struct nfs4_create_arg arg = {
2089                 .dir_fh = NFS_FH(dir),
2090                 .server = server,
2091                 .name = &dentry->d_name,
2092                 .attrs = sattr,
2093                 .ftype = NF4LNK,
2094                 .bitmask = server->attr_bitmask,
2095         };
2096         struct nfs4_create_res res = {
2097                 .server = server,
2098                 .fh = &fhandle,
2099                 .fattr = &fattr,
2100                 .dir_fattr = &dir_fattr,
2101         };
2102         struct rpc_message msg = {
2103                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2104                 .rpc_argp = &arg,
2105                 .rpc_resp = &res,
2106         };
2107         int                     status;
2108
2109         if (len > NFS4_MAXPATHLEN)
2110                 return -ENAMETOOLONG;
2111
2112         arg.u.symlink.pages = &page;
2113         arg.u.symlink.len = len;
2114         nfs_fattr_init(&fattr);
2115         nfs_fattr_init(&dir_fattr);
2116
2117         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2118         if (!status) {
2119                 update_changeattr(dir, &res.dir_cinfo);
2120                 nfs_post_op_update_inode(dir, res.dir_fattr);
2121                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2122         }
2123         return status;
2124 }
2125
2126 static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
2127                 struct page *page, unsigned int len, struct iattr *sattr)
2128 {
2129         struct nfs4_exception exception = { };
2130         int err;
2131         do {
2132                 err = nfs4_handle_exception(NFS_SERVER(dir),
2133                                 _nfs4_proc_symlink(dir, dentry, page,
2134                                                         len, sattr),
2135                                 &exception);
2136         } while (exception.retry);
2137         return err;
2138 }
2139
2140 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2141                 struct iattr *sattr)
2142 {
2143         struct nfs_server *server = NFS_SERVER(dir);
2144         struct nfs_fh fhandle;
2145         struct nfs_fattr fattr, dir_fattr;
2146         struct nfs4_create_arg arg = {
2147                 .dir_fh = NFS_FH(dir),
2148                 .server = server,
2149                 .name = &dentry->d_name,
2150                 .attrs = sattr,
2151                 .ftype = NF4DIR,
2152                 .bitmask = server->attr_bitmask,
2153         };
2154         struct nfs4_create_res res = {
2155                 .server = server,
2156                 .fh = &fhandle,
2157                 .fattr = &fattr,
2158                 .dir_fattr = &dir_fattr,
2159         };
2160         struct rpc_message msg = {
2161                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2162                 .rpc_argp = &arg,
2163                 .rpc_resp = &res,
2164         };
2165         int                     status;
2166
2167         nfs_fattr_init(&fattr);
2168         nfs_fattr_init(&dir_fattr);
2169
2170         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2171         if (!status) {
2172                 update_changeattr(dir, &res.dir_cinfo);
2173                 nfs_post_op_update_inode(dir, res.dir_fattr);
2174                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2175         }
2176         return status;
2177 }
2178
2179 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2180                 struct iattr *sattr)
2181 {
2182         struct nfs4_exception exception = { };
2183         int err;
2184         do {
2185                 err = nfs4_handle_exception(NFS_SERVER(dir),
2186                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2187                                 &exception);
2188         } while (exception.retry);
2189         return err;
2190 }
2191
2192 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2193                   u64 cookie, struct page *page, unsigned int count, int plus)
2194 {
2195         struct inode            *dir = dentry->d_inode;
2196         struct nfs4_readdir_arg args = {
2197                 .fh = NFS_FH(dir),
2198                 .pages = &page,
2199                 .pgbase = 0,
2200                 .count = count,
2201                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2202         };
2203         struct nfs4_readdir_res res;
2204         struct rpc_message msg = {
2205                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2206                 .rpc_argp = &args,
2207                 .rpc_resp = &res,
2208                 .rpc_cred = cred,
2209         };
2210         int                     status;
2211
2212         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __func__,
2213                         dentry->d_parent->d_name.name,
2214                         dentry->d_name.name,
2215                         (unsigned long long)cookie);
2216         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2217         res.pgbase = args.pgbase;
2218         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2219         if (status == 0)
2220                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2221
2222         nfs_invalidate_atime(dir);
2223
2224         dprintk("%s: returns %d\n", __func__, status);
2225         return status;
2226 }
2227
2228 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2229                   u64 cookie, struct page *page, unsigned int count, int plus)
2230 {
2231         struct nfs4_exception exception = { };
2232         int err;
2233         do {
2234                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2235                                 _nfs4_proc_readdir(dentry, cred, cookie,
2236                                         page, count, plus),
2237                                 &exception);
2238         } while (exception.retry);
2239         return err;
2240 }
2241
2242 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2243                 struct iattr *sattr, dev_t rdev)
2244 {
2245         struct nfs_server *server = NFS_SERVER(dir);
2246         struct nfs_fh fh;
2247         struct nfs_fattr fattr, dir_fattr;
2248         struct nfs4_create_arg arg = {
2249                 .dir_fh = NFS_FH(dir),
2250                 .server = server,
2251                 .name = &dentry->d_name,
2252                 .attrs = sattr,
2253                 .bitmask = server->attr_bitmask,
2254         };
2255         struct nfs4_create_res res = {
2256                 .server = server,
2257                 .fh = &fh,
2258                 .fattr = &fattr,
2259                 .dir_fattr = &dir_fattr,
2260         };
2261         struct rpc_message msg = {
2262                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2263                 .rpc_argp = &arg,
2264                 .rpc_resp = &res,
2265         };
2266         int                     status;
2267         int                     mode = sattr->ia_mode;
2268
2269         nfs_fattr_init(&fattr);
2270         nfs_fattr_init(&dir_fattr);
2271
2272         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2273         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2274         if (S_ISFIFO(mode))
2275                 arg.ftype = NF4FIFO;
2276         else if (S_ISBLK(mode)) {
2277                 arg.ftype = NF4BLK;
2278                 arg.u.device.specdata1 = MAJOR(rdev);
2279                 arg.u.device.specdata2 = MINOR(rdev);
2280         }
2281         else if (S_ISCHR(mode)) {
2282                 arg.ftype = NF4CHR;
2283                 arg.u.device.specdata1 = MAJOR(rdev);
2284                 arg.u.device.specdata2 = MINOR(rdev);
2285         }
2286         else
2287                 arg.ftype = NF4SOCK;
2288
2289         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2290         if (status == 0) {
2291                 update_changeattr(dir, &res.dir_cinfo);
2292                 nfs_post_op_update_inode(dir, res.dir_fattr);
2293                 status = nfs_instantiate(dentry, &fh, &fattr);
2294         }
2295         return status;
2296 }
2297
2298 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2299                 struct iattr *sattr, dev_t rdev)
2300 {
2301         struct nfs4_exception exception = { };
2302         int err;
2303         do {
2304                 err = nfs4_handle_exception(NFS_SERVER(dir),
2305                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2306                                 &exception);
2307         } while (exception.retry);
2308         return err;
2309 }
2310
2311 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2312                  struct nfs_fsstat *fsstat)
2313 {
2314         struct nfs4_statfs_arg args = {
2315                 .fh = fhandle,
2316                 .bitmask = server->attr_bitmask,
2317         };
2318         struct rpc_message msg = {
2319                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2320                 .rpc_argp = &args,
2321                 .rpc_resp = fsstat,
2322         };
2323
2324         nfs_fattr_init(fsstat->fattr);
2325         return rpc_call_sync(server->client, &msg, 0);
2326 }
2327
2328 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2329 {
2330         struct nfs4_exception exception = { };
2331         int err;
2332         do {
2333                 err = nfs4_handle_exception(server,
2334                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2335                                 &exception);
2336         } while (exception.retry);
2337         return err;
2338 }
2339
2340 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2341                 struct nfs_fsinfo *fsinfo)
2342 {
2343         struct nfs4_fsinfo_arg args = {
2344                 .fh = fhandle,
2345                 .bitmask = server->attr_bitmask,
2346         };
2347         struct rpc_message msg = {
2348                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2349                 .rpc_argp = &args,
2350                 .rpc_resp = fsinfo,
2351         };
2352
2353         return rpc_call_sync(server->client, &msg, 0);
2354 }
2355
2356 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2357 {
2358         struct nfs4_exception exception = { };
2359         int err;
2360
2361         do {
2362                 err = nfs4_handle_exception(server,
2363                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2364                                 &exception);
2365         } while (exception.retry);
2366         return err;
2367 }
2368
2369 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2370 {
2371         nfs_fattr_init(fsinfo->fattr);
2372         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2373 }
2374
2375 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2376                 struct nfs_pathconf *pathconf)
2377 {
2378         struct nfs4_pathconf_arg args = {
2379                 .fh = fhandle,
2380                 .bitmask = server->attr_bitmask,
2381         };
2382         struct rpc_message msg = {
2383                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2384                 .rpc_argp = &args,
2385                 .rpc_resp = pathconf,
2386         };
2387
2388         /* None of the pathconf attributes are mandatory to implement */
2389         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2390                 memset(pathconf, 0, sizeof(*pathconf));
2391                 return 0;
2392         }
2393
2394         nfs_fattr_init(pathconf->fattr);
2395         return rpc_call_sync(server->client, &msg, 0);
2396 }
2397
2398 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2399                 struct nfs_pathconf *pathconf)
2400 {
2401         struct nfs4_exception exception = { };
2402         int err;
2403
2404         do {
2405                 err = nfs4_handle_exception(server,
2406                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2407                                 &exception);
2408         } while (exception.retry);
2409         return err;
2410 }
2411
2412 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2413 {
2414         struct nfs_server *server = NFS_SERVER(data->inode);
2415
2416         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2417                 rpc_restart_call(task);
2418                 return -EAGAIN;
2419         }
2420
2421         nfs_invalidate_atime(data->inode);
2422         if (task->tk_status > 0)
2423                 renew_lease(server, data->timestamp);
2424         return 0;
2425 }
2426
2427 static void nfs4_proc_read_setup(struct nfs_read_data *data, struct rpc_message *msg)
2428 {
2429         data->timestamp   = jiffies;
2430         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
2431 }
2432
2433 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2434 {
2435         struct inode *inode = data->inode;
2436
2437         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2438                 rpc_restart_call(task);
2439                 return -EAGAIN;
2440         }
2441         if (task->tk_status >= 0) {
2442                 renew_lease(NFS_SERVER(inode), data->timestamp);
2443                 nfs_post_op_update_inode_force_wcc(inode, data->res.fattr);
2444         }
2445         return 0;
2446 }
2447
2448 static void nfs4_proc_write_setup(struct nfs_write_data *data, struct rpc_message *msg)
2449 {
2450         struct nfs_server *server = NFS_SERVER(data->inode);
2451
2452         data->args.bitmask = server->attr_bitmask;
2453         data->res.server = server;
2454         data->timestamp   = jiffies;
2455
2456         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
2457 }
2458
2459 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2460 {
2461         struct inode *inode = data->inode;
2462
2463         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2464                 rpc_restart_call(task);
2465                 return -EAGAIN;
2466         }
2467         nfs_refresh_inode(inode, data->res.fattr);
2468         return 0;
2469 }
2470
2471 static void nfs4_proc_commit_setup(struct nfs_write_data *data, struct rpc_message *msg)
2472 {
2473         struct nfs_server *server = NFS_SERVER(data->inode);
2474
2475         data->args.bitmask = server->attr_bitmask;
2476         data->res.server = server;
2477         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
2478 }
2479
2480 /*
2481  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2482  * standalone procedure for queueing an asynchronous RENEW.
2483  */
2484 static void nfs4_renew_done(struct rpc_task *task, void *data)
2485 {
2486         struct nfs_client *clp = (struct nfs_client *)task->tk_msg.rpc_argp;
2487         unsigned long timestamp = (unsigned long)data;
2488
2489         if (task->tk_status < 0) {
2490                 switch (task->tk_status) {
2491                         case -NFS4ERR_STALE_CLIENTID:
2492                         case -NFS4ERR_EXPIRED:
2493                         case -NFS4ERR_CB_PATH_DOWN:
2494                                 nfs4_schedule_state_recovery(clp);
2495                 }
2496                 return;
2497         }
2498         spin_lock(&clp->cl_lock);
2499         if (time_before(clp->cl_last_renewal,timestamp))
2500                 clp->cl_last_renewal = timestamp;
2501         spin_unlock(&clp->cl_lock);
2502 }
2503
2504 static const struct rpc_call_ops nfs4_renew_ops = {
2505         .rpc_call_done = nfs4_renew_done,
2506 };
2507
2508 int nfs4_proc_async_renew(struct nfs_client *clp, struct rpc_cred *cred)
2509 {
2510         struct rpc_message msg = {
2511                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2512                 .rpc_argp       = clp,
2513                 .rpc_cred       = cred,
2514         };
2515
2516         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2517                         &nfs4_renew_ops, (void *)jiffies);
2518 }
2519
2520 int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
2521 {
2522         struct rpc_message msg = {
2523                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2524                 .rpc_argp       = clp,
2525                 .rpc_cred       = cred,
2526         };
2527         unsigned long now = jiffies;
2528         int status;
2529
2530         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2531         if (status < 0)
2532                 return status;
2533         spin_lock(&clp->cl_lock);
2534         if (time_before(clp->cl_last_renewal,now))
2535                 clp->cl_last_renewal = now;
2536         spin_unlock(&clp->cl_lock);
2537         return 0;
2538 }
2539
2540 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2541 {
2542         return (server->caps & NFS_CAP_ACLS)
2543                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2544                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2545 }
2546
2547 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2548  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2549  * the stack.
2550  */
2551 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2552
2553 static void buf_to_pages(const void *buf, size_t buflen,
2554                 struct page **pages, unsigned int *pgbase)
2555 {
2556         const void *p = buf;
2557
2558         *pgbase = offset_in_page(buf);
2559         p -= *pgbase;
2560         while (p < buf + buflen) {
2561                 *(pages++) = virt_to_page(p);
2562                 p += PAGE_CACHE_SIZE;
2563         }
2564 }
2565
2566 struct nfs4_cached_acl {
2567         int cached;
2568         size_t len;
2569         char data[0];
2570 };
2571
2572 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2573 {
2574         struct nfs_inode *nfsi = NFS_I(inode);
2575
2576         spin_lock(&inode->i_lock);
2577         kfree(nfsi->nfs4_acl);
2578         nfsi->nfs4_acl = acl;
2579         spin_unlock(&inode->i_lock);
2580 }
2581
2582 static void nfs4_zap_acl_attr(struct inode *inode)
2583 {
2584         nfs4_set_cached_acl(inode, NULL);
2585 }
2586
2587 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2588 {
2589         struct nfs_inode *nfsi = NFS_I(inode);
2590         struct nfs4_cached_acl *acl;
2591         int ret = -ENOENT;
2592
2593         spin_lock(&inode->i_lock);
2594         acl = nfsi->nfs4_acl;
2595         if (acl == NULL)
2596                 goto out;
2597         if (buf == NULL) /* user is just asking for length */
2598                 goto out_len;
2599         if (acl->cached == 0)
2600                 goto out;
2601         ret = -ERANGE; /* see getxattr(2) man page */
2602         if (acl->len > buflen)
2603                 goto out;
2604         memcpy(buf, acl->data, acl->len);
2605 out_len:
2606         ret = acl->len;
2607 out:
2608         spin_unlock(&inode->i_lock);
2609         return ret;
2610 }
2611
2612 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2613 {
2614         struct nfs4_cached_acl *acl;
2615
2616         if (buf && acl_len <= PAGE_SIZE) {
2617                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2618                 if (acl == NULL)
2619                         goto out;
2620                 acl->cached = 1;
2621                 memcpy(acl->data, buf, acl_len);
2622         } else {
2623                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2624                 if (acl == NULL)
2625                         goto out;
2626                 acl->cached = 0;
2627         }
2628         acl->len = acl_len;
2629 out:
2630         nfs4_set_cached_acl(inode, acl);
2631 }
2632
2633 static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2634 {
2635         struct page *pages[NFS4ACL_MAXPAGES];
2636         struct nfs_getaclargs args = {
2637                 .fh = NFS_FH(inode),
2638                 .acl_pages = pages,
2639                 .acl_len = buflen,
2640         };
2641         size_t resp_len = buflen;
2642         void *resp_buf;
2643         struct rpc_message msg = {
2644                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2645                 .rpc_argp = &args,
2646                 .rpc_resp = &resp_len,
2647         };
2648         struct page *localpage = NULL;
2649         int ret;
2650
2651         if (buflen < PAGE_SIZE) {
2652                 /* As long as we're doing a round trip to the server anyway,
2653                  * let's be prepared for a page of acl data. */
2654                 localpage = alloc_page(GFP_KERNEL);
2655                 resp_buf = page_address(localpage);
2656                 if (localpage == NULL)
2657                         return -ENOMEM;
2658                 args.acl_pages[0] = localpage;
2659                 args.acl_pgbase = 0;
2660                 resp_len = args.acl_len = PAGE_SIZE;
2661         } else {
2662                 resp_buf = buf;
2663                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2664         }
2665         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2666         if (ret)
2667                 goto out_free;
2668         if (resp_len > args.acl_len)
2669                 nfs4_write_cached_acl(inode, NULL, resp_len);
2670         else
2671                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2672         if (buf) {
2673                 ret = -ERANGE;
2674                 if (resp_len > buflen)
2675                         goto out_free;
2676                 if (localpage)
2677                         memcpy(buf, resp_buf, resp_len);
2678         }
2679         ret = resp_len;
2680 out_free:
2681         if (localpage)
2682                 __free_page(localpage);
2683         return ret;
2684 }
2685
2686 static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2687 {
2688         struct nfs4_exception exception = { };
2689         ssize_t ret;
2690         do {
2691                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
2692                 if (ret >= 0)
2693                         break;
2694                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
2695         } while (exception.retry);
2696         return ret;
2697 }
2698
2699 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2700 {
2701         struct nfs_server *server = NFS_SERVER(inode);
2702         int ret;
2703
2704         if (!nfs4_server_supports_acls(server))
2705                 return -EOPNOTSUPP;
2706         ret = nfs_revalidate_inode(server, inode);
2707         if (ret < 0)
2708                 return ret;
2709         ret = nfs4_read_cached_acl(inode, buf, buflen);
2710         if (ret != -ENOENT)
2711                 return ret;
2712         return nfs4_get_acl_uncached(inode, buf, buflen);
2713 }
2714
2715 static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2716 {
2717         struct nfs_server *server = NFS_SERVER(inode);
2718         struct page *pages[NFS4ACL_MAXPAGES];
2719         struct nfs_setaclargs arg = {
2720                 .fh             = NFS_FH(inode),
2721                 .acl_pages      = pages,
2722                 .acl_len        = buflen,
2723         };
2724         struct rpc_message msg = {
2725                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2726                 .rpc_argp       = &arg,
2727                 .rpc_resp       = NULL,
2728         };
2729         int ret;
2730
2731         if (!nfs4_server_supports_acls(server))
2732                 return -EOPNOTSUPP;
2733         nfs_inode_return_delegation(inode);
2734         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2735         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2736         nfs_zap_caches(inode);
2737         return ret;
2738 }
2739
2740 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2741 {
2742         struct nfs4_exception exception = { };
2743         int err;
2744         do {
2745                 err = nfs4_handle_exception(NFS_SERVER(inode),
2746                                 __nfs4_proc_set_acl(inode, buf, buflen),
2747                                 &exception);
2748         } while (exception.retry);
2749         return err;
2750 }
2751
2752 static int
2753 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2754 {
2755         struct nfs_client *clp = server->nfs_client;
2756
2757         if (!clp || task->tk_status >= 0)
2758                 return 0;
2759         switch(task->tk_status) {
2760                 case -NFS4ERR_STALE_CLIENTID:
2761                 case -NFS4ERR_STALE_STATEID:
2762                 case -NFS4ERR_EXPIRED:
2763                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
2764                         nfs4_schedule_state_recovery(clp);
2765                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2766                                 rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
2767                         task->tk_status = 0;
2768                         return -EAGAIN;
2769                 case -NFS4ERR_DELAY:
2770                         nfs_inc_server_stats((struct nfs_server *) server,
2771                                                 NFSIOS_DELAY);
2772                 case -NFS4ERR_GRACE:
2773                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2774                         task->tk_status = 0;
2775                         return -EAGAIN;
2776                 case -NFS4ERR_OLD_STATEID:
2777                         task->tk_status = 0;
2778                         return -EAGAIN;
2779         }
2780         task->tk_status = nfs4_map_errors(task->tk_status);
2781         return 0;
2782 }
2783
2784 static int nfs4_wait_bit_killable(void *word)
2785 {
2786         if (fatal_signal_pending(current))
2787                 return -ERESTARTSYS;
2788         schedule();
2789         return 0;
2790 }
2791
2792 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs_client *clp)
2793 {
2794         int res;
2795
2796         might_sleep();
2797
2798         rwsem_acquire(&clp->cl_sem.dep_map, 0, 0, _RET_IP_);
2799
2800         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2801                         nfs4_wait_bit_killable, TASK_KILLABLE);
2802
2803         rwsem_release(&clp->cl_sem.dep_map, 1, _RET_IP_);
2804         return res;
2805 }
2806
2807 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2808 {
2809         int res = 0;
2810
2811         might_sleep();
2812
2813         if (*timeout <= 0)
2814                 *timeout = NFS4_POLL_RETRY_MIN;
2815         if (*timeout > NFS4_POLL_RETRY_MAX)
2816                 *timeout = NFS4_POLL_RETRY_MAX;
2817         schedule_timeout_killable(*timeout);
2818         if (fatal_signal_pending(current))
2819                 res = -ERESTARTSYS;
2820         *timeout <<= 1;
2821         return res;
2822 }
2823
2824 /* This is the error handling routine for processes that are allowed
2825  * to sleep.
2826  */
2827 static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2828 {
2829         struct nfs_client *clp = server->nfs_client;
2830         int ret = errorcode;
2831
2832         exception->retry = 0;
2833         switch(errorcode) {
2834                 case 0:
2835                         return 0;
2836                 case -NFS4ERR_STALE_CLIENTID:
2837                 case -NFS4ERR_STALE_STATEID:
2838                 case -NFS4ERR_EXPIRED:
2839                         nfs4_schedule_state_recovery(clp);
2840                         ret = nfs4_wait_clnt_recover(server->client, clp);
2841                         if (ret == 0)
2842                                 exception->retry = 1;
2843                         break;
2844                 case -NFS4ERR_FILE_OPEN:
2845                 case -NFS4ERR_GRACE:
2846                 case -NFS4ERR_DELAY:
2847                         ret = nfs4_delay(server->client, &exception->timeout);
2848                         if (ret != 0)
2849                                 break;
2850                 case -NFS4ERR_OLD_STATEID:
2851                         exception->retry = 1;
2852         }
2853         /* We failed to handle the error */
2854         return nfs4_map_errors(ret);
2855 }
2856
2857 int nfs4_proc_setclientid(struct nfs_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2858 {
2859         nfs4_verifier sc_verifier;
2860         struct nfs4_setclientid setclientid = {
2861                 .sc_verifier = &sc_verifier,
2862                 .sc_prog = program,
2863         };
2864         struct rpc_message msg = {
2865                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2866                 .rpc_argp = &setclientid,
2867                 .rpc_resp = clp,
2868                 .rpc_cred = cred,
2869         };
2870         __be32 *p;
2871         int loop = 0;
2872         int status;
2873
2874         p = (__be32*)sc_verifier.data;
2875         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2876         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2877
2878         for(;;) {
2879                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2880                                 sizeof(setclientid.sc_name), "%s/%s %s %s %u",
2881                                 clp->cl_ipaddr,
2882                                 rpc_peeraddr2str(clp->cl_rpcclient,
2883                                                         RPC_DISPLAY_ADDR),
2884                                 rpc_peeraddr2str(clp->cl_rpcclient,
2885                                                         RPC_DISPLAY_PROTO),
2886                                 clp->cl_rpcclient->cl_auth->au_ops->au_name,
2887                                 clp->cl_id_uniquifier);
2888                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2889                                 sizeof(setclientid.sc_netid),
2890                                 rpc_peeraddr2str(clp->cl_rpcclient,
2891                                                         RPC_DISPLAY_NETID));
2892                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2893                                 sizeof(setclientid.sc_uaddr), "%s.%u.%u",
2894                                 clp->cl_ipaddr, port >> 8, port & 255);
2895
2896                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2897                 if (status != -NFS4ERR_CLID_INUSE)
2898                         break;
2899                 if (signalled())
2900                         break;
2901                 if (loop++ & 1)
2902                         ssleep(clp->cl_lease_time + 1);
2903                 else
2904                         if (++clp->cl_id_uniquifier == 0)
2905                                 break;
2906         }
2907         return status;
2908 }
2909
2910 static int _nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2911 {
2912         struct nfs_fsinfo fsinfo;
2913         struct rpc_message msg = {
2914                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2915                 .rpc_argp = clp,
2916                 .rpc_resp = &fsinfo,
2917                 .rpc_cred = cred,
2918         };
2919         unsigned long now;
2920         int status;
2921
2922         now = jiffies;
2923         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2924         if (status == 0) {
2925                 spin_lock(&clp->cl_lock);
2926                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2927                 clp->cl_last_renewal = now;
2928                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2929                 spin_unlock(&clp->cl_lock);
2930         }
2931         return status;
2932 }
2933
2934 int nfs4_proc_setclientid_confirm(struct nfs_client *clp, struct rpc_cred *cred)
2935 {
2936         long timeout;
2937         int err;
2938         do {
2939                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2940                 switch (err) {
2941                         case 0:
2942                                 return err;
2943                         case -NFS4ERR_RESOURCE:
2944                                 /* The IBM lawyers misread another document! */
2945                         case -NFS4ERR_DELAY:
2946                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2947                 }
2948         } while (err == 0);
2949         return err;
2950 }
2951
2952 struct nfs4_delegreturndata {
2953         struct nfs4_delegreturnargs args;
2954         struct nfs4_delegreturnres res;
2955         struct nfs_fh fh;
2956         nfs4_stateid stateid;
2957         unsigned long timestamp;
2958         struct nfs_fattr fattr;
2959         int rpc_status;
2960 };
2961
2962 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2963 {
2964         struct nfs4_delegreturndata *data = calldata;
2965         data->rpc_status = task->tk_status;
2966         if (data->rpc_status == 0)
2967                 renew_lease(data->res.server, data->timestamp);
2968 }
2969
2970 static void nfs4_delegreturn_release(void *calldata)
2971 {
2972         kfree(calldata);
2973 }
2974
2975 static const struct rpc_call_ops nfs4_delegreturn_ops = {
2976         .rpc_call_done = nfs4_delegreturn_done,
2977         .rpc_release = nfs4_delegreturn_release,
2978 };
2979
2980 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
2981 {
2982         struct nfs4_delegreturndata *data;
2983         struct nfs_server *server = NFS_SERVER(inode);
2984         struct rpc_task *task;
2985         struct rpc_message msg = {
2986                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2987                 .rpc_cred = cred,
2988         };
2989         struct rpc_task_setup task_setup_data = {
2990                 .rpc_client = server->client,
2991                 .rpc_message = &msg,
2992                 .callback_ops = &nfs4_delegreturn_ops,
2993                 .flags = RPC_TASK_ASYNC,
2994         };
2995         int status = 0;
2996
2997         data = kmalloc(sizeof(*data), GFP_KERNEL);
2998         if (data == NULL)
2999                 return -ENOMEM;
3000         data->args.fhandle = &data->fh;
3001         data->args.stateid = &data->stateid;
3002         data->args.bitmask = server->attr_bitmask;
3003         nfs_copy_fh(&data->fh, NFS_FH(inode));
3004         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3005         data->res.fattr = &data->fattr;
3006         data->res.server = server;
3007         nfs_fattr_init(data->res.fattr);
3008         data->timestamp = jiffies;
3009         data->rpc_status = 0;
3010
3011         task_setup_data.callback_data = data;
3012         msg.rpc_argp = &data->args,
3013         msg.rpc_resp = &data->res,
3014         task = rpc_run_task(&task_setup_data);
3015         if (IS_ERR(task))
3016                 return PTR_ERR(task);
3017         if (!issync)
3018                 goto out;
3019         status = nfs4_wait_for_completion_rpc_task(task);
3020         if (status != 0)
3021                 goto out;
3022         status = data->rpc_status;
3023         if (status != 0)
3024                 goto out;
3025         nfs_refresh_inode(inode, &data->fattr);
3026 out:
3027         rpc_put_task(task);
3028         return status;
3029 }
3030
3031 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid, int issync)
3032 {
3033         struct nfs_server *server = NFS_SERVER(inode);
3034         struct nfs4_exception exception = { };
3035         int err;
3036         do {
3037                 err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
3038                 switch (err) {
3039                         case -NFS4ERR_STALE_STATEID:
3040                         case -NFS4ERR_EXPIRED:
3041                         case 0:
3042                                 return 0;
3043                 }
3044                 err = nfs4_handle_exception(server, err, &exception);
3045         } while (exception.retry);
3046         return err;
3047 }
3048
3049 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3050 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3051
3052 /*
3053  * sleep, with exponential backoff, and retry the LOCK operation.
3054  */
3055 static unsigned long
3056 nfs4_set_lock_task_retry(unsigned long timeout)
3057 {
3058         schedule_timeout_killable(timeout);
3059         timeout <<= 1;
3060         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3061                 return NFS4_LOCK_MAXTIMEOUT;
3062         return timeout;
3063 }
3064
3065 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3066 {
3067         struct inode *inode = state->inode;
3068         struct nfs_server *server = NFS_SERVER(inode);
3069         struct nfs_client *clp = server->nfs_client;
3070         struct nfs_lockt_args arg = {
3071                 .fh = NFS_FH(inode),
3072                 .fl = request,
3073         };
3074         struct nfs_lockt_res res = {
3075                 .denied = request,
3076         };
3077         struct rpc_message msg = {
3078                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3079                 .rpc_argp       = &arg,
3080                 .rpc_resp       = &res,
3081                 .rpc_cred       = state->owner->so_cred,
3082         };
3083         struct nfs4_lock_state *lsp;
3084         int status;
3085
3086         down_read(&clp->cl_sem);
3087         arg.lock_owner.clientid = clp->cl_clientid;
3088         status = nfs4_set_lock_state(state, request);
3089         if (status != 0)
3090                 goto out;
3091         lsp = request->fl_u.nfs4_fl.owner;
3092         arg.lock_owner.id = lsp->ls_id.id;
3093         status = rpc_call_sync(server->client, &msg, 0);
3094         switch (status) {
3095                 case 0:
3096                         request->fl_type = F_UNLCK;
3097                         break;
3098                 case -NFS4ERR_DENIED:
3099                         status = 0;
3100         }
3101         request->fl_ops->fl_release_private(request);
3102 out:
3103         up_read(&clp->cl_sem);
3104         return status;
3105 }
3106
3107 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3108 {
3109         struct nfs4_exception exception = { };
3110         int err;
3111
3112         do {
3113                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3114                                 _nfs4_proc_getlk(state, cmd, request),
3115                                 &exception);
3116         } while (exception.retry);
3117         return err;
3118 }
3119
3120 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3121 {
3122         int res = 0;
3123         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3124                 case FL_POSIX:
3125                         res = posix_lock_file_wait(file, fl);
3126                         break;
3127                 case FL_FLOCK:
3128                         res = flock_lock_file_wait(file, fl);
3129                         break;
3130                 default:
3131                         BUG();
3132         }
3133         return res;
3134 }
3135
3136 struct nfs4_unlockdata {
3137         struct nfs_locku_args arg;
3138         struct nfs_locku_res res;
3139         struct nfs4_lock_state *lsp;
3140         struct nfs_open_context *ctx;
3141         struct file_lock fl;
3142         const struct nfs_server *server;
3143         unsigned long timestamp;
3144 };
3145
3146 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3147                 struct nfs_open_context *ctx,
3148                 struct nfs4_lock_state *lsp,
3149                 struct nfs_seqid *seqid)
3150 {
3151         struct nfs4_unlockdata *p;
3152         struct inode *inode = lsp->ls_state->inode;
3153
3154         p = kmalloc(sizeof(*p), GFP_KERNEL);
3155         if (p == NULL)
3156                 return NULL;
3157         p->arg.fh = NFS_FH(inode);
3158         p->arg.fl = &p->fl;
3159         p->arg.seqid = seqid;
3160         p->res.seqid = seqid;
3161         p->arg.stateid = &lsp->ls_stateid;
3162         p->lsp = lsp;
3163         atomic_inc(&lsp->ls_count);
3164         /* Ensure we don't close file until we're done freeing locks! */
3165         p->ctx = get_nfs_open_context(ctx);
3166         memcpy(&p->fl, fl, sizeof(p->fl));
3167         p->server = NFS_SERVER(inode);
3168         return p;
3169 }
3170
3171 static void nfs4_locku_release_calldata(void *data)
3172 {
3173         struct nfs4_unlockdata *calldata = data;
3174         nfs_free_seqid(calldata->arg.seqid);
3175         nfs4_put_lock_state(calldata->lsp);
3176         put_nfs_open_context(calldata->ctx);
3177         kfree(calldata);
3178 }
3179
3180 static void nfs4_locku_done(struct rpc_task *task, void *data)
3181 {
3182         struct nfs4_unlockdata *calldata = data;
3183
3184         if (RPC_ASSASSINATED(task))
3185                 return;
3186         switch (task->tk_status) {
3187                 case 0:
3188                         memcpy(calldata->lsp->ls_stateid.data,
3189                                         calldata->res.stateid.data,
3190                                         sizeof(calldata->lsp->ls_stateid.data));
3191                         renew_lease(calldata->server, calldata->timestamp);
3192                         break;
3193                 case -NFS4ERR_STALE_STATEID:
3194                 case -NFS4ERR_EXPIRED:
3195                         break;
3196                 default:
3197                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN)
3198                                 rpc_restart_call(task);
3199         }
3200 }
3201
3202 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3203 {
3204         struct nfs4_unlockdata *calldata = data;
3205
3206         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3207                 return;
3208         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3209                 /* Note: exit _without_ running nfs4_locku_done */
3210                 task->tk_action = NULL;
3211                 return;
3212         }
3213         calldata->timestamp = jiffies;
3214         rpc_call_start(task);
3215 }
3216
3217 static const struct rpc_call_ops nfs4_locku_ops = {
3218         .rpc_call_prepare = nfs4_locku_prepare,
3219         .rpc_call_done = nfs4_locku_done,
3220         .rpc_release = nfs4_locku_release_calldata,
3221 };
3222
3223 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3224                 struct nfs_open_context *ctx,
3225                 struct nfs4_lock_state *lsp,
3226                 struct nfs_seqid *seqid)
3227 {
3228         struct nfs4_unlockdata *data;
3229         struct rpc_message msg = {
3230                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3231                 .rpc_cred = ctx->cred,
3232         };
3233         struct rpc_task_setup task_setup_data = {
3234                 .rpc_client = NFS_CLIENT(lsp->ls_state->inode),
3235                 .rpc_message = &msg,
3236                 .callback_ops = &nfs4_locku_ops,
3237                 .workqueue = nfsiod_workqueue,
3238                 .flags = RPC_TASK_ASYNC,
3239         };
3240
3241         /* Ensure this is an unlock - when canceling a lock, the
3242          * canceled lock is passed in, and it won't be an unlock.
3243          */
3244         fl->fl_type = F_UNLCK;
3245
3246         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3247         if (data == NULL) {
3248                 nfs_free_seqid(seqid);
3249                 return ERR_PTR(-ENOMEM);
3250         }
3251
3252         msg.rpc_argp = &data->arg,
3253         msg.rpc_resp = &data->res,
3254         task_setup_data.callback_data = data;
3255         return rpc_run_task(&task_setup_data);
3256 }
3257
3258 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3259 {
3260         struct nfs_seqid *seqid;
3261         struct nfs4_lock_state *lsp;
3262         struct rpc_task *task;
3263         int status = 0;
3264         unsigned char fl_flags = request->fl_flags;
3265
3266         status = nfs4_set_lock_state(state, request);
3267         /* Unlock _before_ we do the RPC call */
3268         request->fl_flags |= FL_EXISTS;
3269         if (do_vfs_lock(request->fl_file, request) == -ENOENT)
3270                 goto out;
3271         if (status != 0)
3272                 goto out;
3273         /* Is this a delegated lock? */
3274         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3275                 goto out;
3276         lsp = request->fl_u.nfs4_fl.owner;
3277         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3278         status = -ENOMEM;
3279         if (seqid == NULL)
3280                 goto out;
3281         task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
3282         status = PTR_ERR(task);
3283         if (IS_ERR(task))
3284                 goto out;
3285         status = nfs4_wait_for_completion_rpc_task(task);
3286         rpc_put_task(task);
3287 out:
3288         request->fl_flags = fl_flags;
3289         return status;
3290 }
3291
3292 struct nfs4_lockdata {
3293         struct nfs_lock_args arg;
3294         struct nfs_lock_res res;
3295         struct nfs4_lock_state *lsp;
3296         struct nfs_open_context *ctx;
3297         struct file_lock fl;
3298         unsigned long timestamp;
3299         int rpc_status;
3300         int cancelled;
3301 };
3302
3303 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3304                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3305 {
3306         struct nfs4_lockdata *p;
3307         struct inode *inode = lsp->ls_state->inode;
3308         struct nfs_server *server = NFS_SERVER(inode);
3309
3310         p = kzalloc(sizeof(*p), GFP_KERNEL);
3311         if (p == NULL)
3312                 return NULL;
3313
3314         p->arg.fh = NFS_FH(inode);
3315         p->arg.fl = &p->fl;
3316         p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
3317         if (p->arg.open_seqid == NULL)
3318                 goto out_free;
3319         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3320         if (p->arg.lock_seqid == NULL)
3321                 goto out_free_seqid;
3322         p->arg.lock_stateid = &lsp->ls_stateid;
3323         p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
3324         p->arg.lock_owner.id = lsp->ls_id.id;
3325         p->res.lock_seqid = p->arg.lock_seqid;
3326         p->lsp = lsp;
3327         atomic_inc(&lsp->ls_count);
3328         p->ctx = get_nfs_open_context(ctx);
3329         memcpy(&p->fl, fl, sizeof(p->fl));
3330         return p;
3331 out_free_seqid:
3332         nfs_free_seqid(p->arg.open_seqid);
3333 out_free:
3334         kfree(p);
3335         return NULL;
3336 }
3337
3338 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3339 {
3340         struct nfs4_lockdata *data = calldata;
3341         struct nfs4_state *state = data->lsp->ls_state;
3342
3343         dprintk("%s: begin!\n", __func__);
3344         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3345                 return;
3346         /* Do we need to do an open_to_lock_owner? */
3347         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3348                 if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
3349                         return;
3350                 data->arg.open_stateid = &state->stateid;
3351                 data->arg.new_lock_owner = 1;
3352                 data->res.open_seqid = data->arg.open_seqid;
3353         } else
3354                 data->arg.new_lock_owner = 0;
3355         data->timestamp = jiffies;
3356         rpc_call_start(task);
3357         dprintk("%s: done!, ret = %d\n", __func__, data->rpc_status);
3358 }
3359
3360 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3361 {
3362         struct nfs4_lockdata *data = calldata;
3363
3364         dprintk("%s: begin!\n", __func__);
3365
3366         data->rpc_status = task->tk_status;
3367         if (RPC_ASSASSINATED(task))
3368                 goto out;
3369         if (data->arg.new_lock_owner != 0) {
3370                 if (data->rpc_status == 0)
3371                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3372                 else
3373                         goto out;
3374         }
3375         if (data->rpc_status == 0) {
3376                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3377                                         sizeof(data->lsp->ls_stateid.data));
3378                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3379                 renew_lease(NFS_SERVER(data->ctx->path.dentry->d_inode), data->timestamp);
3380         }
3381 out:
3382         dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
3383 }
3384
3385 static void nfs4_lock_release(void *calldata)
3386 {
3387         struct nfs4_lockdata *data = calldata;
3388
3389         dprintk("%s: begin!\n", __func__);
3390         nfs_free_seqid(data->arg.open_seqid);
3391         if (data->cancelled != 0) {
3392                 struct rpc_task *task;
3393                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3394                                 data->arg.lock_seqid);
3395                 if (!IS_ERR(task))
3396                         rpc_put_task(task);
3397                 dprintk("%s: cancelling lock!\n", __func__);
3398         } else
3399                 nfs_free_seqid(data->arg.lock_seqid);
3400         nfs4_put_lock_state(data->lsp);
3401         put_nfs_open_context(data->ctx);
3402         kfree(data);
3403         dprintk("%s: done!\n", __func__);
3404 }
3405
3406 static const struct rpc_call_ops nfs4_lock_ops = {
3407         .rpc_call_prepare = nfs4_lock_prepare,
3408         .rpc_call_done = nfs4_lock_done,
3409         .rpc_release = nfs4_lock_release,
3410 };
3411
3412 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3413 {
3414         struct nfs4_lockdata *data;
3415         struct rpc_task *task;
3416         struct rpc_message msg = {
3417                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3418                 .rpc_cred = state->owner->so_cred,
3419         };
3420         struct rpc_task_setup task_setup_data = {
3421                 .rpc_client = NFS_CLIENT(state->inode),
3422                 .rpc_message = &msg,
3423                 .callback_ops = &nfs4_lock_ops,
3424                 .workqueue = nfsiod_workqueue,
3425                 .flags = RPC_TASK_ASYNC,
3426         };
3427         int ret;
3428
3429         dprintk("%s: begin!\n", __func__);
3430         data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
3431                         fl->fl_u.nfs4_fl.owner);
3432         if (data == NULL)
3433                 return -ENOMEM;
3434         if (IS_SETLKW(cmd))
3435                 data->arg.block = 1;
3436         if (reclaim != 0)
3437                 data->arg.reclaim = 1;
3438         msg.rpc_argp = &data->arg,
3439         msg.rpc_resp = &data->res,
3440         task_setup_data.callback_data = data;
3441         task = rpc_run_task(&task_setup_data);
3442         if (IS_ERR(task))
3443                 return PTR_ERR(task);
3444         ret = nfs4_wait_for_completion_rpc_task(task);
3445         if (ret == 0) {
3446                 ret = data->rpc_status;
3447                 if (ret == -NFS4ERR_DENIED)
3448                         ret = -EAGAIN;
3449         } else
3450                 data->cancelled = 1;
3451         rpc_put_task(task);
3452         dprintk("%s: done, ret = %d!\n", __func__, ret);
3453         return ret;
3454 }
3455
3456 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3457 {
3458         struct nfs_server *server = NFS_SERVER(state->inode);
3459         struct nfs4_exception exception = { };
3460         int err;
3461
3462         do {
3463                 /* Cache the lock if possible... */
3464                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3465                         return 0;
3466                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3467                 if (err != -NFS4ERR_DELAY)
3468                         break;
3469                 nfs4_handle_exception(server, err, &exception);
3470         } while (exception.retry);
3471         return err;
3472 }
3473
3474 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3475 {
3476         struct nfs_server *server = NFS_SERVER(state->inode);
3477         struct nfs4_exception exception = { };
3478         int err;
3479
3480         err = nfs4_set_lock_state(state, request);
3481         if (err != 0)
3482                 return err;
3483         do {
3484                 if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
3485                         return 0;
3486                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3487                 if (err != -NFS4ERR_DELAY)
3488                         break;
3489                 nfs4_handle_exception(server, err, &exception);
3490         } while (exception.retry);
3491         return err;
3492 }
3493
3494 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3495 {
3496         struct nfs_client *clp = state->owner->so_client;
3497         unsigned char fl_flags = request->fl_flags;
3498         int status;
3499
3500         /* Is this a delegated open? */
3501         status = nfs4_set_lock_state(state, request);
3502         if (status != 0)
3503                 goto out;
3504         request->fl_flags |= FL_ACCESS;
3505         status = do_vfs_lock(request->fl_file, request);
3506         if (status < 0)
3507                 goto out;
3508         down_read(&clp->cl_sem);
3509         if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3510                 struct nfs_inode *nfsi = NFS_I(state->inode);
3511                 /* Yes: cache locks! */
3512                 down_read(&nfsi->rwsem);
3513                 /* ...but avoid races with delegation recall... */
3514                 if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
3515                         request->fl_flags = fl_flags & ~FL_SLEEP;
3516                         status = do_vfs_lock(request->fl_file, request);
3517                         up_read(&nfsi->rwsem);
3518                         goto out_unlock;
3519                 }
3520                 up_read(&nfsi->rwsem);
3521         }
3522         status = _nfs4_do_setlk(state, cmd, request, 0);
3523         if (status != 0)
3524                 goto out_unlock;
3525         /* Note: we always want to sleep here! */
3526         request->fl_flags = fl_flags | FL_SLEEP;
3527         if (do_vfs_lock(request->fl_file, request) < 0)
3528                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
3529 out_unlock:
3530         up_read(&clp->cl_sem);
3531 out:
3532         request->fl_flags = fl_flags;
3533         return status;
3534 }
3535
3536 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3537 {
3538         struct nfs4_exception exception = { };
3539         int err;
3540
3541         do {
3542                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3543                                 _nfs4_proc_setlk(state, cmd, request),
3544                                 &exception);
3545         } while (exception.retry);
3546         return err;
3547 }
3548
3549 static int
3550 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3551 {
3552         struct nfs_open_context *ctx;
3553         struct nfs4_state *state;
3554         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3555         int status;
3556
3557         /* verify open state */
3558         ctx = nfs_file_open_context(filp);
3559         state = ctx->state;
3560
3561         if (request->fl_start < 0 || request->fl_end < 0)
3562                 return -EINVAL;
3563
3564         if (IS_GETLK(cmd))
3565                 return nfs4_proc_getlk(state, F_GETLK, request);
3566
3567         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3568                 return -EINVAL;
3569
3570         if (request->fl_type == F_UNLCK)
3571                 return nfs4_proc_unlck(state, cmd, request);
3572
3573         do {
3574                 status = nfs4_proc_setlk(state, cmd, request);
3575                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3576                         break;
3577                 timeout = nfs4_set_lock_task_retry(timeout);
3578                 status = -ERESTARTSYS;
3579                 if (signalled())
3580                         break;
3581         } while(status < 0);
3582         return status;
3583 }
3584
3585 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3586 {
3587         struct nfs_server *server = NFS_SERVER(state->inode);
3588         struct nfs4_exception exception = { };
3589         int err;
3590
3591         err = nfs4_set_lock_state(state, fl);
3592         if (err != 0)
3593                 goto out;
3594         do {
3595                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3596                 if (err != -NFS4ERR_DELAY)
3597                         break;
3598                 err = nfs4_handle_exception(server, err, &exception);
3599         } while (exception.retry);
3600 out:
3601         return err;
3602 }
3603
3604 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3605
3606 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3607                 size_t buflen, int flags)
3608 {
3609         struct inode *inode = dentry->d_inode;
3610
3611         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3612                 return -EOPNOTSUPP;
3613
3614         return nfs4_proc_set_acl(inode, buf, buflen);
3615 }
3616
3617 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3618  * and that's what we'll do for e.g. user attributes that haven't been set.
3619  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3620  * attributes in kernel-managed attribute namespaces. */
3621 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3622                 size_t buflen)
3623 {
3624         struct inode *inode = dentry->d_inode;
3625
3626         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3627                 return -EOPNOTSUPP;
3628
3629         return nfs4_proc_get_acl(inode, buf, buflen);
3630 }
3631
3632 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3633 {
3634         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3635
3636         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3637                 return 0;
3638         if (buf && buflen < len)
3639                 return -ERANGE;
3640         if (buf)
3641                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3642         return len;
3643 }
3644
3645 int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
3646                 struct nfs4_fs_locations *fs_locations, struct page *page)
3647 {
3648         struct nfs_server *server = NFS_SERVER(dir);
3649         u32 bitmask[2] = {
3650                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3651                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3652         };
3653         struct nfs4_fs_locations_arg args = {
3654                 .dir_fh = NFS_FH(dir),
3655                 .name = name,
3656                 .page = page,
3657                 .bitmask = bitmask,
3658         };
3659         struct rpc_message msg = {
3660                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3661                 .rpc_argp = &args,
3662                 .rpc_resp = fs_locations,
3663         };
3664         int status;
3665
3666         dprintk("%s: start\n", __func__);
3667         nfs_fattr_init(&fs_locations->fattr);
3668         fs_locations->server = server;
3669         fs_locations->nlocations = 0;
3670         status = rpc_call_sync(server->client, &msg, 0);
3671         dprintk("%s: returned status = %d\n", __func__, status);
3672         return status;
3673 }
3674
3675 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3676         .recover_open   = nfs4_open_reclaim,
3677         .recover_lock   = nfs4_lock_reclaim,
3678 };
3679
3680 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3681         .recover_open   = nfs4_open_expired,
3682         .recover_lock   = nfs4_lock_expired,
3683 };
3684
3685 static const struct inode_operations nfs4_file_inode_operations = {
3686         .permission     = nfs_permission,
3687         .getattr        = nfs_getattr,
3688         .setattr        = nfs_setattr,
3689         .getxattr       = nfs4_getxattr,
3690         .setxattr       = nfs4_setxattr,
3691         .listxattr      = nfs4_listxattr,
3692 };
3693
3694 const struct nfs_rpc_ops nfs_v4_clientops = {
3695         .version        = 4,                    /* protocol version */
3696         .dentry_ops     = &nfs4_dentry_operations,
3697         .dir_inode_ops  = &nfs4_dir_inode_operations,
3698         .file_inode_ops = &nfs4_file_inode_operations,
3699         .getroot        = nfs4_proc_get_root,
3700         .getattr        = nfs4_proc_getattr,
3701         .setattr        = nfs4_proc_setattr,
3702         .lookupfh       = nfs4_proc_lookupfh,
3703         .lookup         = nfs4_proc_lookup,
3704         .access         = nfs4_proc_access,
3705         .readlink       = nfs4_proc_readlink,
3706         .create         = nfs4_proc_create,
3707         .remove         = nfs4_proc_remove,
3708         .unlink_setup   = nfs4_proc_unlink_setup,
3709         .unlink_done    = nfs4_proc_unlink_done,
3710         .rename         = nfs4_proc_rename,
3711         .link           = nfs4_proc_link,
3712         .symlink        = nfs4_proc_symlink,
3713         .mkdir          = nfs4_proc_mkdir,
3714         .rmdir          = nfs4_proc_remove,
3715         .readdir        = nfs4_proc_readdir,
3716         .mknod          = nfs4_proc_mknod,
3717         .statfs         = nfs4_proc_statfs,
3718         .fsinfo         = nfs4_proc_fsinfo,
3719         .pathconf       = nfs4_proc_pathconf,
3720         .set_capabilities = nfs4_server_capabilities,
3721         .decode_dirent  = nfs4_decode_dirent,
3722         .read_setup     = nfs4_proc_read_setup,
3723         .read_done      = nfs4_read_done,
3724         .write_setup    = nfs4_proc_write_setup,
3725         .write_done     = nfs4_write_done,
3726         .commit_setup   = nfs4_proc_commit_setup,
3727         .commit_done    = nfs4_commit_done,
3728         .file_open      = nfs_open,
3729         .file_release   = nfs_release,
3730         .lock           = nfs4_proc_lock,
3731         .clear_acl_cache = nfs4_zap_acl_attr,
3732 };
3733
3734 /*
3735  * Local variables:
3736  *  c-basic-offset: 8
3737  * End:
3738  */