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   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 "iostat.h"
  55
  56 #define NFSDBG_FACILITY         NFSDBG_PROC
  57
  58 #define NFS4_POLL_RETRY_MIN     (1*HZ)
  59 #define NFS4_POLL_RETRY_MAX     (15*HZ)
  60
  61 struct nfs4_opendata;
  62 static int _nfs4_proc_open(struct nfs4_opendata *data);
  63 static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
  64 static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *);
  65 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry);
  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 nfs4_client *clp);
  68 extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus);
  69 extern struct rpc_procinfo nfs4_procedures[];
  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                                 __FUNCTION__, -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, u32 *verifier, struct dentry *dentry,
 144                 struct nfs4_readdir_arg *readdir)
 145 {
 146         u32 *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 = (u32 *)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, dentry->d_inode->i_ino);
 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, dentry->d_parent->d_inode->i_ino);
 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 nfs4_client *clp = server->nfs4_state;
 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->before == nfsi->change_attr && cinfo->atomic)
 214                 nfsi->change_attr = cinfo->after;
 215         spin_unlock(&dir->i_lock);
 216 }
 217
 218 struct nfs4_opendata {
 219         atomic_t count;
 220         struct nfs_openargs o_arg;
 221         struct nfs_openres o_res;
 222         struct nfs_open_confirmargs c_arg;
 223         struct nfs_open_confirmres c_res;
 224         struct nfs_fattr f_attr;
 225         struct nfs_fattr dir_attr;
 226         struct dentry *dentry;
 227         struct dentry *dir;
 228         struct nfs4_state_owner *owner;
 229         struct iattr attrs;
 230         unsigned long timestamp;
 231         int rpc_status;
 232         int cancelled;
 233 };
 234
 235 static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
 236                 struct nfs4_state_owner *sp, int flags,
 237                 const struct iattr *attrs)
 238 {
 239         struct dentry *parent = dget_parent(dentry);
 240         struct inode *dir = parent->d_inode;
 241         struct nfs_server *server = NFS_SERVER(dir);
 242         struct nfs4_opendata *p;
 243
 244         p = kzalloc(sizeof(*p), GFP_KERNEL);
 245         if (p == NULL)
 246                 goto err;
 247         p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid);
 248         if (p->o_arg.seqid == NULL)
 249                 goto err_free;
 250         atomic_set(&p->count, 1);
 251         p->dentry = dget(dentry);
 252         p->dir = parent;
 253         p->owner = sp;
 254         atomic_inc(&sp->so_count);
 255         p->o_arg.fh = NFS_FH(dir);
 256         p->o_arg.open_flags = flags,
 257         p->o_arg.clientid = server->nfs4_state->cl_clientid;
 258         p->o_arg.id = sp->so_id;
 259         p->o_arg.name = &dentry->d_name;
 260         p->o_arg.server = server;
 261         p->o_arg.bitmask = server->attr_bitmask;
 262         p->o_arg.claim = NFS4_OPEN_CLAIM_NULL;
 263         p->o_res.f_attr = &p->f_attr;
 264         p->o_res.dir_attr = &p->dir_attr;
 265         p->o_res.server = server;
 266         nfs_fattr_init(&p->f_attr);
 267         nfs_fattr_init(&p->dir_attr);
 268         if (flags & O_EXCL) {
 269                 u32 *s = (u32 *) p->o_arg.u.verifier.data;
 270                 s[0] = jiffies;
 271                 s[1] = current->pid;
 272         } else if (flags & O_CREAT) {
 273                 p->o_arg.u.attrs = &p->attrs;
 274                 memcpy(&p->attrs, attrs, sizeof(p->attrs));
 275         }
 276         p->c_arg.fh = &p->o_res.fh;
 277         p->c_arg.stateid = &p->o_res.stateid;
 278         p->c_arg.seqid = p->o_arg.seqid;
 279         return p;
 280 err_free:
 281         kfree(p);
 282 err:
 283         dput(parent);
 284         return NULL;
 285 }
 286
 287 static void nfs4_opendata_free(struct nfs4_opendata *p)
 288 {
 289         if (p != NULL && atomic_dec_and_test(&p->count)) {
 290                 nfs_free_seqid(p->o_arg.seqid);
 291                 nfs4_put_state_owner(p->owner);
 292                 dput(p->dir);
 293                 dput(p->dentry);
 294                 kfree(p);
 295         }
 296 }
 297
 298 /* Helper for asynchronous RPC calls */
 299 static int nfs4_call_async(struct rpc_clnt *clnt,
 300                 const struct rpc_call_ops *tk_ops, void *calldata)
 301 {
 302         struct rpc_task *task;
 303
 304         if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata)))
 305                 return -ENOMEM;
 306         rpc_execute(task);
 307         return 0;
 308 }
 309
 310 static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task)
 311 {
 312         sigset_t oldset;
 313         int ret;
 314
 315         rpc_clnt_sigmask(task->tk_client, &oldset);
 316         ret = rpc_wait_for_completion_task(task);
 317         rpc_clnt_sigunmask(task->tk_client, &oldset);
 318         return ret;
 319 }
 320
 321 static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags)
 322 {
 323         switch (open_flags) {
 324                 case FMODE_WRITE:
 325                         state->n_wronly++;
 326                         break;
 327                 case FMODE_READ:
 328                         state->n_rdonly++;
 329                         break;
 330                 case FMODE_READ|FMODE_WRITE:
 331                         state->n_rdwr++;
 332         }
 333 }
 334
 335 static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags)
 336 {
 337         struct inode *inode = state->inode;
 338
 339         open_flags &= (FMODE_READ|FMODE_WRITE);
 340         /* Protect against nfs4_find_state_byowner() */
 341         spin_lock(&state->owner->so_lock);
 342         spin_lock(&inode->i_lock);
 343         memcpy(&state->stateid, stateid, sizeof(state->stateid));
 344         update_open_stateflags(state, open_flags);
 345         nfs4_state_set_mode_locked(state, state->state | open_flags);
 346         spin_unlock(&inode->i_lock);
 347         spin_unlock(&state->owner->so_lock);
 348 }
 349
 350 static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
 351 {
 352         struct inode *inode;
 353         struct nfs4_state *state = NULL;
 354
 355         if (!(data->f_attr.valid & NFS_ATTR_FATTR))
 356                 goto out;
 357         inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr);
 358         if (IS_ERR(inode))
 359                 goto out;
 360         state = nfs4_get_open_state(inode, data->owner);
 361         if (state == NULL)
 362                 goto put_inode;
 363         update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags);
 364 put_inode:
 365         iput(inode);
 366 out:
 367         return state;
 368 }
 369
 370 static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state)
 371 {
 372         struct nfs_inode *nfsi = NFS_I(state->inode);
 373         struct nfs_open_context *ctx;
 374
 375         spin_lock(&state->inode->i_lock);
 376         list_for_each_entry(ctx, &nfsi->open_files, list) {
 377                 if (ctx->state != state)
 378                         continue;
 379                 get_nfs_open_context(ctx);
 380                 spin_unlock(&state->inode->i_lock);
 381                 return ctx;
 382         }
 383         spin_unlock(&state->inode->i_lock);
 384         return ERR_PTR(-ENOENT);
 385 }
 386
 387 static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid)
 388 {
 389         int ret;
 390
 391         opendata->o_arg.open_flags = openflags;
 392         ret = _nfs4_proc_open(opendata);
 393         if (ret != 0)
 394                 return ret;
 395         memcpy(stateid->data, opendata->o_res.stateid.data,
 396                         sizeof(stateid->data));
 397         return 0;
 398 }
 399
 400 static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
 401 {
 402         nfs4_stateid stateid;
 403         struct nfs4_state *newstate;
 404         int mode = 0;
 405         int delegation = 0;
 406         int ret;
 407
 408         /* memory barrier prior to reading state->n_* */
 409         smp_rmb();
 410         if (state->n_rdwr != 0) {
 411                 ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid);
 412                 if (ret != 0)
 413                         return ret;
 414                 mode |= FMODE_READ|FMODE_WRITE;
 415                 if (opendata->o_res.delegation_type != 0)
 416                         delegation = opendata->o_res.delegation_type;
 417                 smp_rmb();
 418         }
 419         if (state->n_wronly != 0) {
 420                 ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid);
 421                 if (ret != 0)
 422                         return ret;
 423                 mode |= FMODE_WRITE;
 424                 if (opendata->o_res.delegation_type != 0)
 425                         delegation = opendata->o_res.delegation_type;
 426                 smp_rmb();
 427         }
 428         if (state->n_rdonly != 0) {
 429                 ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid);
 430                 if (ret != 0)
 431                         return ret;
 432                 mode |= FMODE_READ;
 433         }
 434         clear_bit(NFS_DELEGATED_STATE, &state->flags);
 435         if (mode == 0)
 436                 return 0;
 437         if (opendata->o_res.delegation_type == 0)
 438                 opendata->o_res.delegation_type = delegation;
 439         opendata->o_arg.open_flags |= mode;
 440         newstate = nfs4_opendata_to_nfs4_state(opendata);
 441         if (newstate != NULL) {
 442                 if (opendata->o_res.delegation_type != 0) {
 443                         struct nfs_inode *nfsi = NFS_I(newstate->inode);
 444                         int delegation_flags = 0;
 445                         if (nfsi->delegation)
 446                                 delegation_flags = nfsi->delegation->flags;
 447                         if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM))
 448                                 nfs_inode_set_delegation(newstate->inode,
 449                                                 opendata->owner->so_cred,
 450                                                 &opendata->o_res);
 451                         else
 452                                 nfs_inode_reclaim_delegation(newstate->inode,
 453                                                 opendata->owner->so_cred,
 454                                                 &opendata->o_res);
 455                 }
 456                 nfs4_close_state(newstate, opendata->o_arg.open_flags);
 457         }
 458         if (newstate != state)
 459                 return -ESTALE;
 460         return 0;
 461 }
 462
 463 /*
 464  * OPEN_RECLAIM:
 465  *      reclaim state on the server after a reboot.
 466  */
 467 static int _nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 468 {
 469         struct nfs_delegation *delegation = NFS_I(state->inode)->delegation;
 470         struct nfs4_opendata *opendata;
 471         int delegation_type = 0;
 472         int status;
 473
 474         if (delegation != NULL) {
 475                 if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 476                         memcpy(&state->stateid, &delegation->stateid,
 477                                         sizeof(state->stateid));
 478                         set_bit(NFS_DELEGATED_STATE, &state->flags);
 479                         return 0;
 480                 }
 481                 delegation_type = delegation->type;
 482         }
 483         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 484         if (opendata == NULL)
 485                 return -ENOMEM;
 486         opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS;
 487         opendata->o_arg.fh = NFS_FH(state->inode);
 488         nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh);
 489         opendata->o_arg.u.delegation_type = delegation_type;
 490         status = nfs4_open_recover(opendata, state);
 491         nfs4_opendata_free(opendata);
 492         return status;
 493 }
 494
 495 static int nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 496 {
 497         struct nfs_server *server = NFS_SERVER(state->inode);
 498         struct nfs4_exception exception = { };
 499         int err;
 500         do {
 501                 err = _nfs4_do_open_reclaim(sp, state, dentry);
 502                 if (err != -NFS4ERR_DELAY)
 503                         break;
 504                 nfs4_handle_exception(server, err, &exception);
 505         } while (exception.retry);
 506         return err;
 507 }
 508
 509 static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
 510 {
 511         struct nfs_open_context *ctx;
 512         int ret;
 513
 514         ctx = nfs4_state_find_open_context(state);
 515         if (IS_ERR(ctx))
 516                 return PTR_ERR(ctx);
 517         ret = nfs4_do_open_reclaim(sp, state, ctx->dentry);
 518         put_nfs_open_context(ctx);
 519         return ret;
 520 }
 521
 522 static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 523 {
 524         struct nfs4_state_owner  *sp  = state->owner;
 525         struct nfs4_opendata *opendata;
 526         int ret;
 527
 528         if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
 529                 return 0;
 530         opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL);
 531         if (opendata == NULL)
 532                 return -ENOMEM;
 533         opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR;
 534         memcpy(opendata->o_arg.u.delegation.data, state->stateid.data,
 535                         sizeof(opendata->o_arg.u.delegation.data));
 536         ret = nfs4_open_recover(opendata, state);
 537         nfs4_opendata_free(opendata);
 538         return ret;
 539 }
 540
 541 int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state)
 542 {
 543         struct nfs4_exception exception = { };
 544         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 545         int err;
 546         do {
 547                 err = _nfs4_open_delegation_recall(dentry, state);
 548                 switch (err) {
 549                         case 0:
 550                                 return err;
 551                         case -NFS4ERR_STALE_CLIENTID:
 552                         case -NFS4ERR_STALE_STATEID:
 553                         case -NFS4ERR_EXPIRED:
 554                                 /* Don't recall a delegation if it was lost */
 555                                 nfs4_schedule_state_recovery(server->nfs4_state);
 556                                 return err;
 557                 }
 558                 err = nfs4_handle_exception(server, err, &exception);
 559         } while (exception.retry);
 560         return err;
 561 }
 562
 563 static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
 564 {
 565         struct nfs4_opendata *data = calldata;
 566         struct  rpc_message msg = {
 567                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
 568                 .rpc_argp = &data->c_arg,
 569                 .rpc_resp = &data->c_res,
 570                 .rpc_cred = data->owner->so_cred,
 571         };
 572         data->timestamp = jiffies;
 573         rpc_call_setup(task, &msg, 0);
 574 }
 575
 576 static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
 577 {
 578         struct nfs4_opendata *data = calldata;
 579
 580         data->rpc_status = task->tk_status;
 581         if (RPC_ASSASSINATED(task))
 582                 return;
 583         if (data->rpc_status == 0) {
 584                 memcpy(data->o_res.stateid.data, data->c_res.stateid.data,
 585                                 sizeof(data->o_res.stateid.data));
 586                 renew_lease(data->o_res.server, data->timestamp);
 587         }
 588         nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid);
 589         nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status);
 590 }
 591
 592 static void nfs4_open_confirm_release(void *calldata)
 593 {
 594         struct nfs4_opendata *data = calldata;
 595         struct nfs4_state *state = NULL;
 596
 597         /* If this request hasn't been cancelled, do nothing */
 598         if (data->cancelled == 0)
 599                 goto out_free;
 600         /* In case of error, no cleanup! */
 601         if (data->rpc_status != 0)
 602                 goto out_free;
 603         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 604         state = nfs4_opendata_to_nfs4_state(data);
 605         if (state != NULL)
 606                 nfs4_close_state(state, data->o_arg.open_flags);
 607 out_free:
 608         nfs4_opendata_free(data);
 609 }
 610
 611 static const struct rpc_call_ops nfs4_open_confirm_ops = {
 612         .rpc_call_prepare = nfs4_open_confirm_prepare,
 613         .rpc_call_done = nfs4_open_confirm_done,
 614         .rpc_release = nfs4_open_confirm_release,
 615 };
 616
 617 /*
 618  * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
 619  */
 620 static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
 621 {
 622         struct nfs_server *server = NFS_SERVER(data->dir->d_inode);
 623         struct rpc_task *task;
 624         int status;
 625
 626         atomic_inc(&data->count);
 627         /*
 628          * If rpc_run_task() ends up calling ->rpc_release(), we
 629          * want to ensure that it takes the 'error' code path.
 630          */
 631         data->rpc_status = -ENOMEM;
 632         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data);
 633         if (IS_ERR(task))
 634                 return PTR_ERR(task);
 635         status = nfs4_wait_for_completion_rpc_task(task);
 636         if (status != 0) {
 637                 data->cancelled = 1;
 638                 smp_wmb();
 639         } else
 640                 status = data->rpc_status;
 641         rpc_release_task(task);
 642         return status;
 643 }
 644
 645 static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
 646 {
 647         struct nfs4_opendata *data = calldata;
 648         struct nfs4_state_owner *sp = data->owner;
 649         struct rpc_message msg = {
 650                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
 651                 .rpc_argp = &data->o_arg,
 652                 .rpc_resp = &data->o_res,
 653                 .rpc_cred = sp->so_cred,
 654         };
 655
 656         if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
 657                 return;
 658         /* Update sequence id. */
 659         data->o_arg.id = sp->so_id;
 660         data->o_arg.clientid = sp->so_client->cl_clientid;
 661         if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
 662                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
 663         data->timestamp = jiffies;
 664         rpc_call_setup(task, &msg, 0);
 665 }
 666
 667 static void nfs4_open_done(struct rpc_task *task, void *calldata)
 668 {
 669         struct nfs4_opendata *data = calldata;
 670
 671         data->rpc_status = task->tk_status;
 672         if (RPC_ASSASSINATED(task))
 673                 return;
 674         if (task->tk_status == 0) {
 675                 switch (data->o_res.f_attr->mode & S_IFMT) {
 676                         case S_IFREG:
 677                                 break;
 678                         case S_IFLNK:
 679                                 data->rpc_status = -ELOOP;
 680                                 break;
 681                         case S_IFDIR:
 682                                 data->rpc_status = -EISDIR;
 683                                 break;
 684                         default:
 685                                 data->rpc_status = -ENOTDIR;
 686                 }
 687                 renew_lease(data->o_res.server, data->timestamp);
 688         }
 689         nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid);
 690 }
 691
 692 static void nfs4_open_release(void *calldata)
 693 {
 694         struct nfs4_opendata *data = calldata;
 695         struct nfs4_state *state = NULL;
 696
 697         /* If this request hasn't been cancelled, do nothing */
 698         if (data->cancelled == 0)
 699                 goto out_free;
 700         /* In case of error, no cleanup! */
 701         if (data->rpc_status != 0)
 702                 goto out_free;
 703         /* In case we need an open_confirm, no cleanup! */
 704         if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
 705                 goto out_free;
 706         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 707         state = nfs4_opendata_to_nfs4_state(data);
 708         if (state != NULL)
 709                 nfs4_close_state(state, data->o_arg.open_flags);
 710 out_free:
 711         nfs4_opendata_free(data);
 712 }
 713
 714 static const struct rpc_call_ops nfs4_open_ops = {
 715         .rpc_call_prepare = nfs4_open_prepare,
 716         .rpc_call_done = nfs4_open_done,
 717         .rpc_release = nfs4_open_release,
 718 };
 719
 720 /*
 721  * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
 722  */
 723 static int _nfs4_proc_open(struct nfs4_opendata *data)
 724 {
 725         struct inode *dir = data->dir->d_inode;
 726         struct nfs_server *server = NFS_SERVER(dir);
 727         struct nfs_openargs *o_arg = &data->o_arg;
 728         struct nfs_openres *o_res = &data->o_res;
 729         struct rpc_task *task;
 730         int status;
 731
 732         atomic_inc(&data->count);
 733         /*
 734          * If rpc_run_task() ends up calling ->rpc_release(), we
 735          * want to ensure that it takes the 'error' code path.
 736          */
 737         data->rpc_status = -ENOMEM;
 738         task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data);
 739         if (IS_ERR(task))
 740                 return PTR_ERR(task);
 741         status = nfs4_wait_for_completion_rpc_task(task);
 742         if (status != 0) {
 743                 data->cancelled = 1;
 744                 smp_wmb();
 745         } else
 746                 status = data->rpc_status;
 747         rpc_release_task(task);
 748         if (status != 0)
 749                 return status;
 750
 751         if (o_arg->open_flags & O_CREAT) {
 752                 update_changeattr(dir, &o_res->cinfo);
 753                 nfs_post_op_update_inode(dir, o_res->dir_attr);
 754         } else
 755                 nfs_refresh_inode(dir, o_res->dir_attr);
 756         if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
 757                 status = _nfs4_proc_open_confirm(data);
 758                 if (status != 0)
 759                         return status;
 760         }
 761         nfs_confirm_seqid(&data->owner->so_seqid, 0);
 762         if (!(o_res->f_attr->valid & NFS_ATTR_FATTR))
 763                 return server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr);
 764         return 0;
 765 }
 766
 767 static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags)
 768 {
 769         struct nfs_access_entry cache;
 770         int mask = 0;
 771         int status;
 772
 773         if (openflags & FMODE_READ)
 774                 mask |= MAY_READ;
 775         if (openflags & FMODE_WRITE)
 776                 mask |= MAY_WRITE;
 777         status = nfs_access_get_cached(inode, cred, &cache);
 778         if (status == 0)
 779                 goto out;
 780
 781         /* Be clever: ask server to check for all possible rights */
 782         cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ;
 783         cache.cred = cred;
 784         cache.jiffies = jiffies;
 785         status = _nfs4_proc_access(inode, &cache);
 786         if (status != 0)
 787                 return status;
 788         nfs_access_add_cache(inode, &cache);
 789 out:
 790         if ((cache.mask & mask) == mask)
 791                 return 0;
 792         return -EACCES;
 793 }
 794
 795 int nfs4_recover_expired_lease(struct nfs_server *server)
 796 {
 797         struct nfs4_client *clp = server->nfs4_state;
 798
 799         if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state))
 800                 nfs4_schedule_state_recovery(clp);
 801         return nfs4_wait_clnt_recover(server->client, clp);
 802 }
 803
 804 /*
 805  * OPEN_EXPIRED:
 806  *      reclaim state on the server after a network partition.
 807  *      Assumes caller holds the appropriate lock
 808  */
 809 static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 810 {
 811         struct inode *inode = state->inode;
 812         struct nfs_delegation *delegation = NFS_I(inode)->delegation;
 813         struct nfs4_opendata *opendata;
 814         int openflags = state->state & (FMODE_READ|FMODE_WRITE);
 815         int ret;
 816
 817         if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) {
 818                 ret = _nfs4_do_access(inode, sp->so_cred, openflags);
 819                 if (ret < 0)
 820                         return ret;
 821                 memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid));
 822                 set_bit(NFS_DELEGATED_STATE, &state->flags);
 823                 return 0;
 824         }
 825         opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL);
 826         if (opendata == NULL)
 827                 return -ENOMEM;
 828         ret = nfs4_open_recover(opendata, state);
 829         if (ret == -ESTALE) {
 830                 /* Invalidate the state owner so we don't ever use it again */
 831                 nfs4_drop_state_owner(sp);
 832                 d_drop(dentry);
 833         }
 834         nfs4_opendata_free(opendata);
 835         return ret;
 836 }
 837
 838 static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry)
 839 {
 840         struct nfs_server *server = NFS_SERVER(dentry->d_inode);
 841         struct nfs4_exception exception = { };
 842         int err;
 843
 844         do {
 845                 err = _nfs4_open_expired(sp, state, dentry);
 846                 if (err == -NFS4ERR_DELAY)
 847                         nfs4_handle_exception(server, err, &exception);
 848         } while (exception.retry);
 849         return err;
 850 }
 851
 852 static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
 853 {
 854         struct nfs_open_context *ctx;
 855         int ret;
 856
 857         ctx = nfs4_state_find_open_context(state);
 858         if (IS_ERR(ctx))
 859                 return PTR_ERR(ctx);
 860         ret = nfs4_do_open_expired(sp, state, ctx->dentry);
 861         put_nfs_open_context(ctx);
 862         return ret;
 863 }
 864
 865 /*
 866  * Returns a referenced nfs4_state if there is an open delegation on the file
 867  */
 868 static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res)
 869 {
 870         struct nfs_delegation *delegation;
 871         struct nfs_server *server = NFS_SERVER(inode);
 872         struct nfs4_client *clp = server->nfs4_state;
 873         struct nfs_inode *nfsi = NFS_I(inode);
 874         struct nfs4_state_owner *sp = NULL;
 875         struct nfs4_state *state = NULL;
 876         int open_flags = flags & (FMODE_READ|FMODE_WRITE);
 877         int err;
 878
 879         err = -ENOMEM;
 880         if (!(sp = nfs4_get_state_owner(server, cred))) {
 881                 dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__);
 882                 return err;
 883         }
 884         err = nfs4_recover_expired_lease(server);
 885         if (err != 0)
 886                 goto out_put_state_owner;
 887         /* Protect against reboot recovery - NOTE ORDER! */
 888         down_read(&clp->cl_sem);
 889         /* Protect against delegation recall */
 890         down_read(&nfsi->rwsem);
 891         delegation = NFS_I(inode)->delegation;
 892         err = -ENOENT;
 893         if (delegation == NULL || (delegation->type & open_flags) != open_flags)
 894                 goto out_err;
 895         err = -ENOMEM;
 896         state = nfs4_get_open_state(inode, sp);
 897         if (state == NULL)
 898                 goto out_err;
 899
 900         err = -ENOENT;
 901         if ((state->state & open_flags) == open_flags) {
 902                 spin_lock(&inode->i_lock);
 903                 update_open_stateflags(state, open_flags);
 904                 spin_unlock(&inode->i_lock);
 905                 goto out_ok;
 906         } else if (state->state != 0)
 907                 goto out_put_open_state;
 908
 909         lock_kernel();
 910         err = _nfs4_do_access(inode, cred, open_flags);
 911         unlock_kernel();
 912         if (err != 0)
 913                 goto out_put_open_state;
 914         set_bit(NFS_DELEGATED_STATE, &state->flags);
 915         update_open_stateid(state, &delegation->stateid, open_flags);
 916 out_ok:
 917         nfs4_put_state_owner(sp);
 918         up_read(&nfsi->rwsem);
 919         up_read(&clp->cl_sem);
 920         *res = state;
 921         return 0;
 922 out_put_open_state:
 923         nfs4_put_open_state(state);
 924 out_err:
 925         up_read(&nfsi->rwsem);
 926         up_read(&clp->cl_sem);
 927         if (err != -EACCES)
 928                 nfs_inode_return_delegation(inode);
 929 out_put_state_owner:
 930         nfs4_put_state_owner(sp);
 931         return err;
 932 }
 933
 934 static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred)
 935 {
 936         struct nfs4_exception exception = { };
 937         struct nfs4_state *res = ERR_PTR(-EIO);
 938         int err;
 939
 940         do {
 941                 err = _nfs4_open_delegated(inode, flags, cred, &res);
 942                 if (err == 0)
 943                         break;
 944                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode),
 945                                         err, &exception));
 946         } while (exception.retry);
 947         return res;
 948 }
 949
 950 /*
 951  * Returns a referenced nfs4_state
 952  */
 953 static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res)
 954 {
 955         struct nfs4_state_owner  *sp;
 956         struct nfs4_state     *state = NULL;
 957         struct nfs_server       *server = NFS_SERVER(dir);
 958         struct nfs4_client *clp = server->nfs4_state;
 959         struct nfs4_opendata *opendata;
 960         int                     status;
 961
 962         /* Protect against reboot recovery conflicts */
 963         status = -ENOMEM;
 964         if (!(sp = nfs4_get_state_owner(server, cred))) {
 965                 dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
 966                 goto out_err;
 967         }
 968         status = nfs4_recover_expired_lease(server);
 969         if (status != 0)
 970                 goto err_put_state_owner;
 971         down_read(&clp->cl_sem);
 972         status = -ENOMEM;
 973         opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr);
 974         if (opendata == NULL)
 975                 goto err_put_state_owner;
 976
 977         status = _nfs4_proc_open(opendata);
 978         if (status != 0)
 979                 goto err_opendata_free;
 980
 981         status = -ENOMEM;
 982         state = nfs4_opendata_to_nfs4_state(opendata);
 983         if (state == NULL)
 984                 goto err_opendata_free;
 985         if (opendata->o_res.delegation_type != 0)
 986                 nfs_inode_set_delegation(state->inode, cred, &opendata->o_res);
 987         nfs4_opendata_free(opendata);
 988         nfs4_put_state_owner(sp);
 989         up_read(&clp->cl_sem);
 990         *res = state;
 991         return 0;
 992 err_opendata_free:
 993         nfs4_opendata_free(opendata);
 994 err_put_state_owner:
 995         nfs4_put_state_owner(sp);
 996 out_err:
 997         /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */
 998         up_read(&clp->cl_sem);
 999         *res = NULL;
1000         return status;
1001 }
1002
1003
1004 static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred)
1005 {
1006         struct nfs4_exception exception = { };
1007         struct nfs4_state *res;
1008         int status;
1009
1010         do {
1011                 status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res);
1012                 if (status == 0)
1013                         break;
1014                 /* NOTE: BAD_SEQID means the server and client disagree about the
1015                  * book-keeping w.r.t. state-changing operations
1016                  * (OPEN/CLOSE/LOCK/LOCKU...)
1017                  * It is actually a sign of a bug on the client or on the server.
1018                  *
1019                  * If we receive a BAD_SEQID error in the particular case of
1020                  * doing an OPEN, we assume that nfs_increment_open_seqid() will
1021                  * have unhashed the old state_owner for us, and that we can
1022                  * therefore safely retry using a new one. We should still warn
1023                  * the user though...
1024                  */
1025                 if (status == -NFS4ERR_BAD_SEQID) {
1026                         printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n");
1027                         exception.retry = 1;
1028                         continue;
1029                 }
1030                 /*
1031                  * BAD_STATEID on OPEN means that the server cancelled our
1032                  * state before it received the OPEN_CONFIRM.
1033                  * Recover by retrying the request as per the discussion
1034                  * on Page 181 of RFC3530.
1035                  */
1036                 if (status == -NFS4ERR_BAD_STATEID) {
1037                         exception.retry = 1;
1038                         continue;
1039                 }
1040                 res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir),
1041                                         status, &exception));
1042         } while (exception.retry);
1043         return res;
1044 }
1045
1046 static int _nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1047                 struct iattr *sattr, struct nfs4_state *state)
1048 {
1049         struct nfs_server *server = NFS_SERVER(inode);
1050         struct nfs_setattrargs  arg = {
1051                 .fh             = NFS_FH(inode),
1052                 .iap            = sattr,
1053                 .server         = server,
1054                 .bitmask = server->attr_bitmask,
1055         };
1056         struct nfs_setattrres  res = {
1057                 .fattr          = fattr,
1058                 .server         = server,
1059         };
1060         struct rpc_message msg = {
1061                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
1062                 .rpc_argp       = &arg,
1063                 .rpc_resp       = &res,
1064         };
1065         unsigned long timestamp = jiffies;
1066         int status;
1067
1068         nfs_fattr_init(fattr);
1069
1070         if (nfs4_copy_delegation_stateid(&arg.stateid, inode)) {
1071                 /* Use that stateid */
1072         } else if (state != NULL) {
1073                 msg.rpc_cred = state->owner->so_cred;
1074                 nfs4_copy_stateid(&arg.stateid, state, current->files);
1075         } else
1076                 memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid));
1077
1078         status = rpc_call_sync(server->client, &msg, 0);
1079         if (status == 0 && state != NULL)
1080                 renew_lease(server, timestamp);
1081         return status;
1082 }
1083
1084 static int nfs4_do_setattr(struct inode *inode, struct nfs_fattr *fattr,
1085                 struct iattr *sattr, struct nfs4_state *state)
1086 {
1087         struct nfs_server *server = NFS_SERVER(inode);
1088         struct nfs4_exception exception = { };
1089         int err;
1090         do {
1091                 err = nfs4_handle_exception(server,
1092                                 _nfs4_do_setattr(inode, fattr, sattr, state),
1093                                 &exception);
1094         } while (exception.retry);
1095         return err;
1096 }
1097
1098 struct nfs4_closedata {
1099         struct inode *inode;
1100         struct nfs4_state *state;
1101         struct nfs_closeargs arg;
1102         struct nfs_closeres res;
1103         struct nfs_fattr fattr;
1104         unsigned long timestamp;
1105 };
1106
1107 static void nfs4_free_closedata(void *data)
1108 {
1109         struct nfs4_closedata *calldata = data;
1110         struct nfs4_state_owner *sp = calldata->state->owner;
1111
1112         nfs4_put_open_state(calldata->state);
1113         nfs_free_seqid(calldata->arg.seqid);
1114         nfs4_put_state_owner(sp);
1115         kfree(calldata);
1116 }
1117
1118 static void nfs4_close_done(struct rpc_task *task, void *data)
1119 {
1120         struct nfs4_closedata *calldata = data;
1121         struct nfs4_state *state = calldata->state;
1122         struct nfs_server *server = NFS_SERVER(calldata->inode);
1123
1124         if (RPC_ASSASSINATED(task))
1125                 return;
1126         /* hmm. we are done with the inode, and in the process of freeing
1127          * the state_owner. we keep this around to process errors
1128          */
1129         nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid);
1130         switch (task->tk_status) {
1131                 case 0:
1132                         memcpy(&state->stateid, &calldata->res.stateid,
1133                                         sizeof(state->stateid));
1134                         renew_lease(server, calldata->timestamp);
1135                         break;
1136                 case -NFS4ERR_STALE_STATEID:
1137                 case -NFS4ERR_EXPIRED:
1138                         nfs4_schedule_state_recovery(server->nfs4_state);
1139                         break;
1140                 default:
1141                         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
1142                                 rpc_restart_call(task);
1143                                 return;
1144                         }
1145         }
1146         nfs_refresh_inode(calldata->inode, calldata->res.fattr);
1147 }
1148
1149 static void nfs4_close_prepare(struct rpc_task *task, void *data)
1150 {
1151         struct nfs4_closedata *calldata = data;
1152         struct nfs4_state *state = calldata->state;
1153         struct rpc_message msg = {
1154                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
1155                 .rpc_argp = &calldata->arg,
1156                 .rpc_resp = &calldata->res,
1157                 .rpc_cred = state->owner->so_cred,
1158         };
1159         int mode = 0, old_mode;
1160
1161         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
1162                 return;
1163         /* Recalculate the new open mode in case someone reopened the file
1164          * while we were waiting in line to be scheduled.
1165          */
1166         spin_lock(&state->owner->so_lock);
1167         spin_lock(&calldata->inode->i_lock);
1168         mode = old_mode = state->state;
1169         if (state->n_rdwr == 0) {
1170                 if (state->n_rdonly == 0)
1171                         mode &= ~FMODE_READ;
1172                 if (state->n_wronly == 0)
1173                         mode &= ~FMODE_WRITE;
1174         }
1175         nfs4_state_set_mode_locked(state, mode);
1176         spin_unlock(&calldata->inode->i_lock);
1177         spin_unlock(&state->owner->so_lock);
1178         if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) {
1179                 /* Note: exit _without_ calling nfs4_close_done */
1180                 task->tk_action = NULL;
1181                 return;
1182         }
1183         nfs_fattr_init(calldata->res.fattr);
1184         if (mode != 0)
1185                 msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
1186         calldata->arg.open_flags = mode;
1187         calldata->timestamp = jiffies;
1188         rpc_call_setup(task, &msg, 0);
1189 }
1190
1191 static const struct rpc_call_ops nfs4_close_ops = {
1192         .rpc_call_prepare = nfs4_close_prepare,
1193         .rpc_call_done = nfs4_close_done,
1194         .rpc_release = nfs4_free_closedata,
1195 };
1196
1197 /*
1198  * It is possible for data to be read/written from a mem-mapped file
1199  * after the sys_close call (which hits the vfs layer as a flush).
1200  * This means that we can't safely call nfsv4 close on a file until
1201  * the inode is cleared. This in turn means that we are not good
1202  * NFSv4 citizens - we do not indicate to the server to update the file's
1203  * share state even when we are done with one of the three share
1204  * stateid's in the inode.
1205  *
1206  * NOTE: Caller must be holding the sp->so_owner semaphore!
1207  */
1208 int nfs4_do_close(struct inode *inode, struct nfs4_state *state)
1209 {
1210         struct nfs_server *server = NFS_SERVER(inode);
1211         struct nfs4_closedata *calldata;
1212         int status = -ENOMEM;
1213
1214         calldata = kmalloc(sizeof(*calldata), GFP_KERNEL);
1215         if (calldata == NULL)
1216                 goto out;
1217         calldata->inode = inode;
1218         calldata->state = state;
1219         calldata->arg.fh = NFS_FH(inode);
1220         calldata->arg.stateid = &state->stateid;
1221         /* Serialization for the sequence id */
1222         calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid);
1223         if (calldata->arg.seqid == NULL)
1224                 goto out_free_calldata;
1225         calldata->arg.bitmask = server->attr_bitmask;
1226         calldata->res.fattr = &calldata->fattr;
1227         calldata->res.server = server;
1228
1229         status = nfs4_call_async(server->client, &nfs4_close_ops, calldata);
1230         if (status == 0)
1231                 goto out;
1232
1233         nfs_free_seqid(calldata->arg.seqid);
1234 out_free_calldata:
1235         kfree(calldata);
1236 out:
1237         return status;
1238 }
1239
1240 static int nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state)
1241 {
1242         struct file *filp;
1243
1244         filp = lookup_instantiate_filp(nd, dentry, NULL);
1245         if (!IS_ERR(filp)) {
1246                 struct nfs_open_context *ctx;
1247                 ctx = (struct nfs_open_context *)filp->private_data;
1248                 ctx->state = state;
1249                 return 0;
1250         }
1251         nfs4_close_state(state, nd->intent.open.flags);
1252         return PTR_ERR(filp);
1253 }
1254
1255 struct dentry *
1256 nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
1257 {
1258         struct iattr attr;
1259         struct rpc_cred *cred;
1260         struct nfs4_state *state;
1261         struct dentry *res;
1262
1263         if (nd->flags & LOOKUP_CREATE) {
1264                 attr.ia_mode = nd->intent.open.create_mode;
1265                 attr.ia_valid = ATTR_MODE;
1266                 if (!IS_POSIXACL(dir))
1267                         attr.ia_mode &= ~current->fs->umask;
1268         } else {
1269                 attr.ia_valid = 0;
1270                 BUG_ON(nd->intent.open.flags & O_CREAT);
1271         }
1272
1273         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1274         if (IS_ERR(cred))
1275                 return (struct dentry *)cred;
1276         state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred);
1277         put_rpccred(cred);
1278         if (IS_ERR(state)) {
1279                 if (PTR_ERR(state) == -ENOENT)
1280                         d_add(dentry, NULL);
1281                 return (struct dentry *)state;
1282         }
1283         res = d_add_unique(dentry, igrab(state->inode));
1284         if (res != NULL)
1285                 dentry = res;
1286         nfs4_intent_set_file(nd, dentry, state);
1287         return res;
1288 }
1289
1290 int
1291 nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd)
1292 {
1293         struct rpc_cred *cred;
1294         struct nfs4_state *state;
1295
1296         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1297         if (IS_ERR(cred))
1298                 return PTR_ERR(cred);
1299         state = nfs4_open_delegated(dentry->d_inode, openflags, cred);
1300         if (IS_ERR(state))
1301                 state = nfs4_do_open(dir, dentry, openflags, NULL, cred);
1302         put_rpccred(cred);
1303         if (IS_ERR(state)) {
1304                 switch (PTR_ERR(state)) {
1305                         case -EPERM:
1306                         case -EACCES:
1307                         case -EDQUOT:
1308                         case -ENOSPC:
1309                         case -EROFS:
1310                                 lookup_instantiate_filp(nd, (struct dentry *)state, NULL);
1311                                 return 1;
1312                         case -ENOENT:
1313                                 if (dentry->d_inode == NULL)
1314                                         return 1;
1315                 }
1316                 goto out_drop;
1317         }
1318         if (state->inode == dentry->d_inode) {
1319                 nfs4_intent_set_file(nd, dentry, state);
1320                 return 1;
1321         }
1322         nfs4_close_state(state, openflags);
1323 out_drop:
1324         d_drop(dentry);
1325         return 0;
1326 }
1327
1328
1329 static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1330 {
1331         struct nfs4_server_caps_res res = {};
1332         struct rpc_message msg = {
1333                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
1334                 .rpc_argp = fhandle,
1335                 .rpc_resp = &res,
1336         };
1337         int status;
1338
1339         status = rpc_call_sync(server->client, &msg, 0);
1340         if (status == 0) {
1341                 memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
1342                 if (res.attr_bitmask[0] & FATTR4_WORD0_ACL)
1343                         server->caps |= NFS_CAP_ACLS;
1344                 if (res.has_links != 0)
1345                         server->caps |= NFS_CAP_HARDLINKS;
1346                 if (res.has_symlinks != 0)
1347                         server->caps |= NFS_CAP_SYMLINKS;
1348                 server->acl_bitmask = res.acl_bitmask;
1349         }
1350         return status;
1351 }
1352
1353 int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
1354 {
1355         struct nfs4_exception exception = { };
1356         int err;
1357         do {
1358                 err = nfs4_handle_exception(server,
1359                                 _nfs4_server_capabilities(server, fhandle),
1360                                 &exception);
1361         } while (exception.retry);
1362         return err;
1363 }
1364
1365 static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1366                 struct nfs_fsinfo *info)
1367 {
1368         struct nfs4_lookup_root_arg args = {
1369                 .bitmask = nfs4_fattr_bitmap,
1370         };
1371         struct nfs4_lookup_res res = {
1372                 .server = server,
1373                 .fattr = info->fattr,
1374                 .fh = fhandle,
1375         };
1376         struct rpc_message msg = {
1377                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
1378                 .rpc_argp = &args,
1379                 .rpc_resp = &res,
1380         };
1381         nfs_fattr_init(info->fattr);
1382         return rpc_call_sync(server->client, &msg, 0);
1383 }
1384
1385 static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
1386                 struct nfs_fsinfo *info)
1387 {
1388         struct nfs4_exception exception = { };
1389         int err;
1390         do {
1391                 err = nfs4_handle_exception(server,
1392                                 _nfs4_lookup_root(server, fhandle, info),
1393                                 &exception);
1394         } while (exception.retry);
1395         return err;
1396 }
1397
1398 static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
1399                 struct nfs_fsinfo *info)
1400 {
1401         struct nfs_fattr *      fattr = info->fattr;
1402         unsigned char *         p;
1403         struct qstr             q;
1404         struct nfs4_lookup_arg args = {
1405                 .dir_fh = fhandle,
1406                 .name = &q,
1407                 .bitmask = nfs4_fattr_bitmap,
1408         };
1409         struct nfs4_lookup_res res = {
1410                 .server = server,
1411                 .fattr = fattr,
1412                 .fh = fhandle,
1413         };
1414         struct rpc_message msg = {
1415                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1416                 .rpc_argp = &args,
1417                 .rpc_resp = &res,
1418         };
1419         int status;
1420
1421         /*
1422          * Now we do a separate LOOKUP for each component of the mount path.
1423          * The LOOKUPs are done separately so that we can conveniently
1424          * catch an ERR_WRONGSEC if it occurs along the way...
1425          */
1426         status = nfs4_lookup_root(server, fhandle, info);
1427         if (status)
1428                 goto out;
1429
1430         p = server->mnt_path;
1431         for (;;) {
1432                 struct nfs4_exception exception = { };
1433
1434                 while (*p == '/')
1435                         p++;
1436                 if (!*p)
1437                         break;
1438                 q.name = p;
1439                 while (*p && (*p != '/'))
1440                         p++;
1441                 q.len = p - q.name;
1442
1443                 do {
1444                         nfs_fattr_init(fattr);
1445                         status = nfs4_handle_exception(server,
1446                                         rpc_call_sync(server->client, &msg, 0),
1447                                         &exception);
1448                 } while (exception.retry);
1449                 if (status == 0)
1450                         continue;
1451                 if (status == -ENOENT) {
1452                         printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path);
1453                         printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n");
1454                 }
1455                 break;
1456         }
1457         if (status == 0)
1458                 status = nfs4_server_capabilities(server, fhandle);
1459         if (status == 0)
1460                 status = nfs4_do_fsinfo(server, fhandle, info);
1461 out:
1462         return nfs4_map_errors(status);
1463 }
1464
1465 /*
1466  * Get locations and (maybe) other attributes of a referral.
1467  * Note that we'll actually follow the referral later when
1468  * we detect fsid mismatch in inode revalidation
1469  */
1470 static int nfs4_get_referral(struct inode *dir, struct qstr *name, struct nfs_fattr *fattr, struct nfs_fh *fhandle)
1471 {
1472         int status = -ENOMEM;
1473         struct page *page = NULL;
1474         struct nfs4_fs_locations *locations = NULL;
1475         struct dentry dentry = {};
1476
1477         page = alloc_page(GFP_KERNEL);
1478         if (page == NULL)
1479                 goto out;
1480         locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
1481         if (locations == NULL)
1482                 goto out;
1483
1484         dentry.d_name.name = name->name;
1485         dentry.d_name.len = name->len;
1486         status = nfs4_proc_fs_locations(dir, &dentry, locations, page);
1487         if (status != 0)
1488                 goto out;
1489         /* Make sure server returned a different fsid for the referral */
1490         if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
1491                 dprintk("%s: server did not return a different fsid for a referral at %s\n", __FUNCTION__, name->name);
1492                 status = -EIO;
1493                 goto out;
1494         }
1495
1496         memcpy(fattr, &locations->fattr, sizeof(struct nfs_fattr));
1497         fattr->valid |= NFS_ATTR_FATTR_V4_REFERRAL;
1498         if (!fattr->mode)
1499                 fattr->mode = S_IFDIR;
1500         memset(fhandle, 0, sizeof(struct nfs_fh));
1501 out:
1502         if (page)
1503                 __free_page(page);
1504         if (locations)
1505                 kfree(locations);
1506         return status;
1507 }
1508
1509 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1510 {
1511         struct nfs4_getattr_arg args = {
1512                 .fh = fhandle,
1513                 .bitmask = server->attr_bitmask,
1514         };
1515         struct nfs4_getattr_res res = {
1516                 .fattr = fattr,
1517                 .server = server,
1518         };
1519         struct rpc_message msg = {
1520                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1521                 .rpc_argp = &args,
1522                 .rpc_resp = &res,
1523         };
1524
1525         nfs_fattr_init(fattr);
1526         return rpc_call_sync(server->client, &msg, 0);
1527 }
1528
1529 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1530 {
1531         struct nfs4_exception exception = { };
1532         int err;
1533         do {
1534                 err = nfs4_handle_exception(server,
1535                                 _nfs4_proc_getattr(server, fhandle, fattr),
1536                                 &exception);
1537         } while (exception.retry);
1538         return err;
1539 }
1540
1541 /*
1542  * The file is not closed if it is opened due to the a request to change
1543  * the size of the file. The open call will not be needed once the
1544  * VFS layer lookup-intents are implemented.
1545  *
1546  * Close is called when the inode is destroyed.
1547  * If we haven't opened the file for O_WRONLY, we
1548  * need to in the size_change case to obtain a stateid.
1549  *
1550  * Got race?
1551  * Because OPEN is always done by name in nfsv4, it is
1552  * possible that we opened a different file by the same
1553  * name.  We can recognize this race condition, but we
1554  * can't do anything about it besides returning an error.
1555  *
1556  * This will be fixed with VFS changes (lookup-intent).
1557  */
1558 static int
1559 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1560                   struct iattr *sattr)
1561 {
1562         struct rpc_cred *cred;
1563         struct inode *inode = dentry->d_inode;
1564         struct nfs_open_context *ctx;
1565         struct nfs4_state *state = NULL;
1566         int status;
1567
1568         nfs_fattr_init(fattr);
1569
1570         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1571         if (IS_ERR(cred))
1572                 return PTR_ERR(cred);
1573
1574         /* Search for an existing open(O_WRITE) file */
1575         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1576         if (ctx != NULL)
1577                 state = ctx->state;
1578
1579         status = nfs4_do_setattr(inode, fattr, sattr, state);
1580         if (status == 0)
1581                 nfs_setattr_update_inode(inode, sattr);
1582         if (ctx != NULL)
1583                 put_nfs_open_context(ctx);
1584         put_rpccred(cred);
1585         return status;
1586 }
1587
1588 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1589                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1590 {
1591         int                    status;
1592         struct nfs_server *server = NFS_SERVER(dir);
1593         struct nfs4_lookup_arg args = {
1594                 .bitmask = server->attr_bitmask,
1595                 .dir_fh = NFS_FH(dir),
1596                 .name = name,
1597         };
1598         struct nfs4_lookup_res res = {
1599                 .server = server,
1600                 .fattr = fattr,
1601                 .fh = fhandle,
1602         };
1603         struct rpc_message msg = {
1604                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1605                 .rpc_argp = &args,
1606                 .rpc_resp = &res,
1607         };
1608
1609         nfs_fattr_init(fattr);
1610
1611         dprintk("NFS call  lookup %s\n", name->name);
1612         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1613         if (status == -NFS4ERR_MOVED)
1614                 status = nfs4_get_referral(dir, name, fattr, fhandle);
1615         dprintk("NFS reply lookup: %d\n", status);
1616         return status;
1617 }
1618
1619 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1620 {
1621         struct nfs4_exception exception = { };
1622         int err;
1623         do {
1624                 err = nfs4_handle_exception(NFS_SERVER(dir),
1625                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1626                                 &exception);
1627         } while (exception.retry);
1628         return err;
1629 }
1630
1631 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1632 {
1633         struct nfs4_accessargs args = {
1634                 .fh = NFS_FH(inode),
1635         };
1636         struct nfs4_accessres res = { 0 };
1637         struct rpc_message msg = {
1638                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1639                 .rpc_argp = &args,
1640                 .rpc_resp = &res,
1641                 .rpc_cred = entry->cred,
1642         };
1643         int mode = entry->mask;
1644         int status;
1645
1646         /*
1647          * Determine which access bits we want to ask for...
1648          */
1649         if (mode & MAY_READ)
1650                 args.access |= NFS4_ACCESS_READ;
1651         if (S_ISDIR(inode->i_mode)) {
1652                 if (mode & MAY_WRITE)
1653                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1654                 if (mode & MAY_EXEC)
1655                         args.access |= NFS4_ACCESS_LOOKUP;
1656         } else {
1657                 if (mode & MAY_WRITE)
1658                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1659                 if (mode & MAY_EXEC)
1660                         args.access |= NFS4_ACCESS_EXECUTE;
1661         }
1662         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1663         if (!status) {
1664                 entry->mask = 0;
1665                 if (res.access & NFS4_ACCESS_READ)
1666                         entry->mask |= MAY_READ;
1667                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1668                         entry->mask |= MAY_WRITE;
1669                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1670                         entry->mask |= MAY_EXEC;
1671         }
1672         return status;
1673 }
1674
1675 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1676 {
1677         struct nfs4_exception exception = { };
1678         int err;
1679         do {
1680                 err = nfs4_handle_exception(NFS_SERVER(inode),
1681                                 _nfs4_proc_access(inode, entry),
1682                                 &exception);
1683         } while (exception.retry);
1684         return err;
1685 }
1686
1687 /*
1688  * TODO: For the time being, we don't try to get any attributes
1689  * along with any of the zero-copy operations READ, READDIR,
1690  * READLINK, WRITE.
1691  *
1692  * In the case of the first three, we want to put the GETATTR
1693  * after the read-type operation -- this is because it is hard
1694  * to predict the length of a GETATTR response in v4, and thus
1695  * align the READ data correctly.  This means that the GETATTR
1696  * may end up partially falling into the page cache, and we should
1697  * shift it into the 'tail' of the xdr_buf before processing.
1698  * To do this efficiently, we need to know the total length
1699  * of data received, which doesn't seem to be available outside
1700  * of the RPC layer.
1701  *
1702  * In the case of WRITE, we also want to put the GETATTR after
1703  * the operation -- in this case because we want to make sure
1704  * we get the post-operation mtime and size.  This means that
1705  * we can't use xdr_encode_pages() as written: we need a variant
1706  * of it which would leave room in the 'tail' iovec.
1707  *
1708  * Both of these changes to the XDR layer would in fact be quite
1709  * minor, but I decided to leave them for a subsequent patch.
1710  */
1711 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1712                 unsigned int pgbase, unsigned int pglen)
1713 {
1714         struct nfs4_readlink args = {
1715                 .fh       = NFS_FH(inode),
1716                 .pgbase   = pgbase,
1717                 .pglen    = pglen,
1718                 .pages    = &page,
1719         };
1720         struct rpc_message msg = {
1721                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1722                 .rpc_argp = &args,
1723                 .rpc_resp = NULL,
1724         };
1725
1726         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1727 }
1728
1729 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1730                 unsigned int pgbase, unsigned int pglen)
1731 {
1732         struct nfs4_exception exception = { };
1733         int err;
1734         do {
1735                 err = nfs4_handle_exception(NFS_SERVER(inode),
1736                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1737                                 &exception);
1738         } while (exception.retry);
1739         return err;
1740 }
1741
1742 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1743 {
1744         int flags = rdata->flags;
1745         struct inode *inode = rdata->inode;
1746         struct nfs_fattr *fattr = rdata->res.fattr;
1747         struct nfs_server *server = NFS_SERVER(inode);
1748         struct rpc_message msg = {
1749                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1750                 .rpc_argp       = &rdata->args,
1751                 .rpc_resp       = &rdata->res,
1752                 .rpc_cred       = rdata->cred,
1753         };
1754         unsigned long timestamp = jiffies;
1755         int status;
1756
1757         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1758                         (long long) rdata->args.offset);
1759
1760         nfs_fattr_init(fattr);
1761         status = rpc_call_sync(server->client, &msg, flags);
1762         if (!status)
1763                 renew_lease(server, timestamp);
1764         dprintk("NFS reply read: %d\n", status);
1765         return status;
1766 }
1767
1768 static int nfs4_proc_read(struct nfs_read_data *rdata)
1769 {
1770         struct nfs4_exception exception = { };
1771         int err;
1772         do {
1773                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1774                                 _nfs4_proc_read(rdata),
1775                                 &exception);
1776         } while (exception.retry);
1777         return err;
1778 }
1779
1780 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1781 {
1782         int rpcflags = wdata->flags;
1783         struct inode *inode = wdata->inode;
1784         struct nfs_fattr *fattr = wdata->res.fattr;
1785         struct nfs_server *server = NFS_SERVER(inode);
1786         struct rpc_message msg = {
1787                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1788                 .rpc_argp       = &wdata->args,
1789                 .rpc_resp       = &wdata->res,
1790                 .rpc_cred       = wdata->cred,
1791         };
1792         int status;
1793
1794         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1795                         (long long) wdata->args.offset);
1796
1797         wdata->args.bitmask = server->attr_bitmask;
1798         wdata->res.server = server;
1799         wdata->timestamp = jiffies;
1800         nfs_fattr_init(fattr);
1801         status = rpc_call_sync(server->client, &msg, rpcflags);
1802         dprintk("NFS reply write: %d\n", status);
1803         if (status < 0)
1804                 return status;
1805         renew_lease(server, wdata->timestamp);
1806         nfs_post_op_update_inode(inode, fattr);
1807         return wdata->res.count;
1808 }
1809
1810 static int nfs4_proc_write(struct nfs_write_data *wdata)
1811 {
1812         struct nfs4_exception exception = { };
1813         int err;
1814         do {
1815                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1816                                 _nfs4_proc_write(wdata),
1817                                 &exception);
1818         } while (exception.retry);
1819         return err;
1820 }
1821
1822 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1823 {
1824         struct inode *inode = cdata->inode;
1825         struct nfs_fattr *fattr = cdata->res.fattr;
1826         struct nfs_server *server = NFS_SERVER(inode);
1827         struct rpc_message msg = {
1828                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1829                 .rpc_argp       = &cdata->args,
1830                 .rpc_resp       = &cdata->res,
1831                 .rpc_cred       = cdata->cred,
1832         };
1833         int status;
1834
1835         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1836                         (long long) cdata->args.offset);
1837
1838         cdata->args.bitmask = server->attr_bitmask;
1839         cdata->res.server = server;
1840         cdata->timestamp = jiffies;
1841         nfs_fattr_init(fattr);
1842         status = rpc_call_sync(server->client, &msg, 0);
1843         if (status >= 0)
1844                 renew_lease(server, cdata->timestamp);
1845         dprintk("NFS reply commit: %d\n", status);
1846         if (status >= 0)
1847                 nfs_post_op_update_inode(inode, fattr);
1848         return status;
1849 }
1850
1851 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1852 {
1853         struct nfs4_exception exception = { };
1854         int err;
1855         do {
1856                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1857                                 _nfs4_proc_commit(cdata),
1858                                 &exception);
1859         } while (exception.retry);
1860         return err;
1861 }
1862
1863 /*
1864  * Got race?
1865  * We will need to arrange for the VFS layer to provide an atomic open.
1866  * Until then, this create/open method is prone to inefficiency and race
1867  * conditions due to the lookup, create, and open VFS calls from sys_open()
1868  * placed on the wire.
1869  *
1870  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1871  * The file will be opened again in the subsequent VFS open call
1872  * (nfs4_proc_file_open).
1873  *
1874  * The open for read will just hang around to be used by any process that
1875  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1876  */
1877
1878 static int
1879 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1880                  int flags, struct nameidata *nd)
1881 {
1882         struct nfs4_state *state;
1883         struct rpc_cred *cred;
1884         int status = 0;
1885
1886         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1887         if (IS_ERR(cred)) {
1888                 status = PTR_ERR(cred);
1889                 goto out;
1890         }
1891         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1892         put_rpccred(cred);
1893         if (IS_ERR(state)) {
1894                 status = PTR_ERR(state);
1895                 goto out;
1896         }
1897         d_instantiate(dentry, igrab(state->inode));
1898         if (flags & O_EXCL) {
1899                 struct nfs_fattr fattr;
1900                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1901                 if (status == 0)
1902                         nfs_setattr_update_inode(state->inode, sattr);
1903         }
1904         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1905                 status = nfs4_intent_set_file(nd, dentry, state);
1906         else
1907                 nfs4_close_state(state, flags);
1908 out:
1909         return status;
1910 }
1911
1912 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1913 {
1914         struct nfs_server *server = NFS_SERVER(dir);
1915         struct nfs4_remove_arg args = {
1916                 .fh = NFS_FH(dir),
1917                 .name = name,
1918                 .bitmask = server->attr_bitmask,
1919         };
1920         struct nfs_fattr dir_attr;
1921         struct nfs4_remove_res  res = {
1922                 .server = server,
1923                 .dir_attr = &dir_attr,
1924         };
1925         struct rpc_message msg = {
1926                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1927                 .rpc_argp       = &args,
1928                 .rpc_resp       = &res,
1929         };
1930         int                     status;
1931
1932         nfs_fattr_init(res.dir_attr);
1933         status = rpc_call_sync(server->client, &msg, 0);
1934         if (status == 0) {
1935                 update_changeattr(dir, &res.cinfo);
1936                 nfs_post_op_update_inode(dir, res.dir_attr);
1937         }
1938         return status;
1939 }
1940
1941 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1942 {
1943         struct nfs4_exception exception = { };
1944         int err;
1945         do {
1946                 err = nfs4_handle_exception(NFS_SERVER(dir),
1947                                 _nfs4_proc_remove(dir, name),
1948                                 &exception);
1949         } while (exception.retry);
1950         return err;
1951 }
1952
1953 struct unlink_desc {
1954         struct nfs4_remove_arg  args;
1955         struct nfs4_remove_res  res;
1956         struct nfs_fattr dir_attr;
1957 };
1958
1959 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1960                 struct qstr *name)
1961 {
1962         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1963         struct unlink_desc *up;
1964
1965         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1966         if (!up)
1967                 return -ENOMEM;
1968
1969         up->args.fh = NFS_FH(dir->d_inode);
1970         up->args.name = name;
1971         up->args.bitmask = server->attr_bitmask;
1972         up->res.server = server;
1973         up->res.dir_attr = &up->dir_attr;
1974
1975         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1976         msg->rpc_argp = &up->args;
1977         msg->rpc_resp = &up->res;
1978         return 0;
1979 }
1980
1981 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1982 {
1983         struct rpc_message *msg = &task->tk_msg;
1984         struct unlink_desc *up;
1985
1986         if (msg->rpc_resp != NULL) {
1987                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1988                 update_changeattr(dir->d_inode, &up->res.cinfo);
1989                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1990                 kfree(up);
1991                 msg->rpc_resp = NULL;
1992                 msg->rpc_argp = NULL;
1993         }
1994         return 0;
1995 }
1996
1997 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1998                 struct inode *new_dir, struct qstr *new_name)
1999 {
2000         struct nfs_server *server = NFS_SERVER(old_dir);
2001         struct nfs4_rename_arg arg = {
2002                 .old_dir = NFS_FH(old_dir),
2003                 .new_dir = NFS_FH(new_dir),
2004                 .old_name = old_name,
2005                 .new_name = new_name,
2006                 .bitmask = server->attr_bitmask,
2007         };
2008         struct nfs_fattr old_fattr, new_fattr;
2009         struct nfs4_rename_res res = {
2010                 .server = server,
2011                 .old_fattr = &old_fattr,
2012                 .new_fattr = &new_fattr,
2013         };
2014         struct rpc_message msg = {
2015                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
2016                 .rpc_argp = &arg,
2017                 .rpc_resp = &res,
2018         };
2019         int                     status;
2020
2021         nfs_fattr_init(res.old_fattr);
2022         nfs_fattr_init(res.new_fattr);
2023         status = rpc_call_sync(server->client, &msg, 0);
2024
2025         if (!status) {
2026                 update_changeattr(old_dir, &res.old_cinfo);
2027                 nfs_post_op_update_inode(old_dir, res.old_fattr);
2028                 update_changeattr(new_dir, &res.new_cinfo);
2029                 nfs_post_op_update_inode(new_dir, res.new_fattr);
2030         }
2031         return status;
2032 }
2033
2034 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
2035                 struct inode *new_dir, struct qstr *new_name)
2036 {
2037         struct nfs4_exception exception = { };
2038         int err;
2039         do {
2040                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
2041                                 _nfs4_proc_rename(old_dir, old_name,
2042                                         new_dir, new_name),
2043                                 &exception);
2044         } while (exception.retry);
2045         return err;
2046 }
2047
2048 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2049 {
2050         struct nfs_server *server = NFS_SERVER(inode);
2051         struct nfs4_link_arg arg = {
2052                 .fh     = NFS_FH(inode),
2053                 .dir_fh = NFS_FH(dir),
2054                 .name   = name,
2055                 .bitmask = server->attr_bitmask,
2056         };
2057         struct nfs_fattr fattr, dir_attr;
2058         struct nfs4_link_res res = {
2059                 .server = server,
2060                 .fattr = &fattr,
2061                 .dir_attr = &dir_attr,
2062         };
2063         struct rpc_message msg = {
2064                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2065                 .rpc_argp = &arg,
2066                 .rpc_resp = &res,
2067         };
2068         int                     status;
2069
2070         nfs_fattr_init(res.fattr);
2071         nfs_fattr_init(res.dir_attr);
2072         status = rpc_call_sync(server->client, &msg, 0);
2073         if (!status) {
2074                 update_changeattr(dir, &res.cinfo);
2075                 nfs_post_op_update_inode(dir, res.dir_attr);
2076                 nfs_post_op_update_inode(inode, res.fattr);
2077         }
2078
2079         return status;
2080 }
2081
2082 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2083 {
2084         struct nfs4_exception exception = { };
2085         int err;
2086         do {
2087                 err = nfs4_handle_exception(NFS_SERVER(inode),
2088                                 _nfs4_proc_link(inode, dir, name),
2089                                 &exception);
2090         } while (exception.retry);
2091         return err;
2092 }
2093
2094 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2095                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2096                 struct nfs_fattr *fattr)
2097 {
2098         struct nfs_server *server = NFS_SERVER(dir);
2099         struct nfs_fattr dir_fattr;
2100         struct nfs4_create_arg arg = {
2101                 .dir_fh = NFS_FH(dir),
2102                 .server = server,
2103                 .name = name,
2104                 .attrs = sattr,
2105                 .ftype = NF4LNK,
2106                 .bitmask = server->attr_bitmask,
2107         };
2108         struct nfs4_create_res res = {
2109                 .server = server,
2110                 .fh = fhandle,
2111                 .fattr = fattr,
2112                 .dir_fattr = &dir_fattr,
2113         };
2114         struct rpc_message msg = {
2115                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2116                 .rpc_argp = &arg,
2117                 .rpc_resp = &res,
2118         };
2119         int                     status;
2120
2121         if (path->len > NFS4_MAXPATHLEN)
2122                 return -ENAMETOOLONG;
2123         arg.u.symlink = path;
2124         nfs_fattr_init(fattr);
2125         nfs_fattr_init(&dir_fattr);
2126
2127         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2128         if (!status)
2129                 update_changeattr(dir, &res.dir_cinfo);
2130         nfs_post_op_update_inode(dir, res.dir_fattr);
2131         return status;
2132 }
2133
2134 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2135                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2136                 struct nfs_fattr *fattr)
2137 {
2138         struct nfs4_exception exception = { };
2139         int err;
2140         do {
2141                 err = nfs4_handle_exception(NFS_SERVER(dir),
2142                                 _nfs4_proc_symlink(dir, name, path, sattr,
2143                                         fhandle, fattr),
2144                                 &exception);
2145         } while (exception.retry);
2146         return err;
2147 }
2148
2149 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2150                 struct iattr *sattr)
2151 {
2152         struct nfs_server *server = NFS_SERVER(dir);
2153         struct nfs_fh fhandle;
2154         struct nfs_fattr fattr, dir_fattr;
2155         struct nfs4_create_arg arg = {
2156                 .dir_fh = NFS_FH(dir),
2157                 .server = server,
2158                 .name = &dentry->d_name,
2159                 .attrs = sattr,
2160                 .ftype = NF4DIR,
2161                 .bitmask = server->attr_bitmask,
2162         };
2163         struct nfs4_create_res res = {
2164                 .server = server,
2165                 .fh = &fhandle,
2166                 .fattr = &fattr,
2167                 .dir_fattr = &dir_fattr,
2168         };
2169         struct rpc_message msg = {
2170                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2171                 .rpc_argp = &arg,
2172                 .rpc_resp = &res,
2173         };
2174         int                     status;
2175
2176         nfs_fattr_init(&fattr);
2177         nfs_fattr_init(&dir_fattr);
2178
2179         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2180         if (!status) {
2181                 update_changeattr(dir, &res.dir_cinfo);
2182                 nfs_post_op_update_inode(dir, res.dir_fattr);
2183                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2184         }
2185         return status;
2186 }
2187
2188 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2189                 struct iattr *sattr)
2190 {
2191         struct nfs4_exception exception = { };
2192         int err;
2193         do {
2194                 err = nfs4_handle_exception(NFS_SERVER(dir),
2195                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2196                                 &exception);
2197         } while (exception.retry);
2198         return err;
2199 }
2200
2201 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2202                   u64 cookie, struct page *page, unsigned int count, int plus)
2203 {
2204         struct inode            *dir = dentry->d_inode;
2205         struct nfs4_readdir_arg args = {
2206                 .fh = NFS_FH(dir),
2207                 .pages = &page,
2208                 .pgbase = 0,
2209                 .count = count,
2210                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2211         };
2212         struct nfs4_readdir_res res;
2213         struct rpc_message msg = {
2214                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2215                 .rpc_argp = &args,
2216                 .rpc_resp = &res,
2217                 .rpc_cred = cred,
2218         };
2219         int                     status;
2220
2221         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2222                         dentry->d_parent->d_name.name,
2223                         dentry->d_name.name,
2224                         (unsigned long long)cookie);
2225         lock_kernel();
2226         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2227         res.pgbase = args.pgbase;
2228         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2229         if (status == 0)
2230                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2231         unlock_kernel();
2232         dprintk("%s: returns %d\n", __FUNCTION__, status);
2233         return status;
2234 }
2235
2236 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2237                   u64 cookie, struct page *page, unsigned int count, int plus)
2238 {
2239         struct nfs4_exception exception = { };
2240         int err;
2241         do {
2242                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2243                                 _nfs4_proc_readdir(dentry, cred, cookie,
2244                                         page, count, plus),
2245                                 &exception);
2246         } while (exception.retry);
2247         return err;
2248 }
2249
2250 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2251                 struct iattr *sattr, dev_t rdev)
2252 {
2253         struct nfs_server *server = NFS_SERVER(dir);
2254         struct nfs_fh fh;
2255         struct nfs_fattr fattr, dir_fattr;
2256         struct nfs4_create_arg arg = {
2257                 .dir_fh = NFS_FH(dir),
2258                 .server = server,
2259                 .name = &dentry->d_name,
2260                 .attrs = sattr,
2261                 .bitmask = server->attr_bitmask,
2262         };
2263         struct nfs4_create_res res = {
2264                 .server = server,
2265                 .fh = &fh,
2266                 .fattr = &fattr,
2267                 .dir_fattr = &dir_fattr,
2268         };
2269         struct rpc_message msg = {
2270                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2271                 .rpc_argp = &arg,
2272                 .rpc_resp = &res,
2273         };
2274         int                     status;
2275         int                     mode = sattr->ia_mode;
2276
2277         nfs_fattr_init(&fattr);
2278         nfs_fattr_init(&dir_fattr);
2279
2280         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2281         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2282         if (S_ISFIFO(mode))
2283                 arg.ftype = NF4FIFO;
2284         else if (S_ISBLK(mode)) {
2285                 arg.ftype = NF4BLK;
2286                 arg.u.device.specdata1 = MAJOR(rdev);
2287                 arg.u.device.specdata2 = MINOR(rdev);
2288         }
2289         else if (S_ISCHR(mode)) {
2290                 arg.ftype = NF4CHR;
2291                 arg.u.device.specdata1 = MAJOR(rdev);
2292                 arg.u.device.specdata2 = MINOR(rdev);
2293         }
2294         else
2295                 arg.ftype = NF4SOCK;
2296
2297         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2298         if (status == 0) {
2299                 update_changeattr(dir, &res.dir_cinfo);
2300                 nfs_post_op_update_inode(dir, res.dir_fattr);
2301                 status = nfs_instantiate(dentry, &fh, &fattr);
2302         }
2303         return status;
2304 }
2305
2306 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2307                 struct iattr *sattr, dev_t rdev)
2308 {
2309         struct nfs4_exception exception = { };
2310         int err;
2311         do {
2312                 err = nfs4_handle_exception(NFS_SERVER(dir),
2313                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2314                                 &exception);
2315         } while (exception.retry);
2316         return err;
2317 }
2318
2319 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2320                  struct nfs_fsstat *fsstat)
2321 {
2322         struct nfs4_statfs_arg args = {
2323                 .fh = fhandle,
2324                 .bitmask = server->attr_bitmask,
2325         };
2326         struct rpc_message msg = {
2327                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2328                 .rpc_argp = &args,
2329                 .rpc_resp = fsstat,
2330         };
2331
2332         nfs_fattr_init(fsstat->fattr);
2333         return rpc_call_sync(server->client, &msg, 0);
2334 }
2335
2336 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2337 {
2338         struct nfs4_exception exception = { };
2339         int err;
2340         do {
2341                 err = nfs4_handle_exception(server,
2342                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2343                                 &exception);
2344         } while (exception.retry);
2345         return err;
2346 }
2347
2348 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2349                 struct nfs_fsinfo *fsinfo)
2350 {
2351         struct nfs4_fsinfo_arg args = {
2352                 .fh = fhandle,
2353                 .bitmask = server->attr_bitmask,
2354         };
2355         struct rpc_message msg = {
2356                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2357                 .rpc_argp = &args,
2358                 .rpc_resp = fsinfo,
2359         };
2360
2361         return rpc_call_sync(server->client, &msg, 0);
2362 }
2363
2364 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2365 {
2366         struct nfs4_exception exception = { };
2367         int err;
2368
2369         do {
2370                 err = nfs4_handle_exception(server,
2371                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2372                                 &exception);
2373         } while (exception.retry);
2374         return err;
2375 }
2376
2377 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2378 {
2379         nfs_fattr_init(fsinfo->fattr);
2380         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2381 }
2382
2383 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2384                 struct nfs_pathconf *pathconf)
2385 {
2386         struct nfs4_pathconf_arg args = {
2387                 .fh = fhandle,
2388                 .bitmask = server->attr_bitmask,
2389         };
2390         struct rpc_message msg = {
2391                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2392                 .rpc_argp = &args,
2393                 .rpc_resp = pathconf,
2394         };
2395
2396         /* None of the pathconf attributes are mandatory to implement */
2397         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2398                 memset(pathconf, 0, sizeof(*pathconf));
2399                 return 0;
2400         }
2401
2402         nfs_fattr_init(pathconf->fattr);
2403         return rpc_call_sync(server->client, &msg, 0);
2404 }
2405
2406 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2407                 struct nfs_pathconf *pathconf)
2408 {
2409         struct nfs4_exception exception = { };
2410         int err;
2411
2412         do {
2413                 err = nfs4_handle_exception(server,
2414                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2415                                 &exception);
2416         } while (exception.retry);
2417         return err;
2418 }
2419
2420 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2421 {
2422         struct nfs_server *server = NFS_SERVER(data->inode);
2423
2424         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2425                 rpc_restart_call(task);
2426                 return -EAGAIN;
2427         }
2428         if (task->tk_status > 0)
2429                 renew_lease(server, data->timestamp);
2430         return 0;
2431 }
2432
2433 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2434 {
2435         struct rpc_message msg = {
2436                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2437                 .rpc_argp = &data->args,
2438                 .rpc_resp = &data->res,
2439                 .rpc_cred = data->cred,
2440         };
2441
2442         data->timestamp   = jiffies;
2443
2444         rpc_call_setup(&data->task, &msg, 0);
2445 }
2446
2447 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2448 {
2449         struct inode *inode = data->inode;
2450
2451         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2452                 rpc_restart_call(task);
2453                 return -EAGAIN;
2454         }
2455         if (task->tk_status >= 0) {
2456                 renew_lease(NFS_SERVER(inode), data->timestamp);
2457                 nfs_post_op_update_inode(inode, data->res.fattr);
2458         }
2459         return 0;
2460 }
2461
2462 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2463 {
2464         struct rpc_message msg = {
2465                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2466                 .rpc_argp = &data->args,
2467                 .rpc_resp = &data->res,
2468                 .rpc_cred = data->cred,
2469         };
2470         struct inode *inode = data->inode;
2471         struct nfs_server *server = NFS_SERVER(inode);
2472         int stable;
2473
2474         if (how & FLUSH_STABLE) {
2475                 if (!NFS_I(inode)->ncommit)
2476                         stable = NFS_FILE_SYNC;
2477                 else
2478                         stable = NFS_DATA_SYNC;
2479         } else
2480                 stable = NFS_UNSTABLE;
2481         data->args.stable = stable;
2482         data->args.bitmask = server->attr_bitmask;
2483         data->res.server = server;
2484
2485         data->timestamp   = jiffies;
2486
2487         /* Finalize the task. */
2488         rpc_call_setup(&data->task, &msg, 0);
2489 }
2490
2491 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2492 {
2493         struct inode *inode = data->inode;
2494
2495         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2496                 rpc_restart_call(task);
2497                 return -EAGAIN;
2498         }
2499         if (task->tk_status >= 0)
2500                 nfs_post_op_update_inode(inode, data->res.fattr);
2501         return 0;
2502 }
2503
2504 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2505 {
2506         struct rpc_message msg = {
2507                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2508                 .rpc_argp = &data->args,
2509                 .rpc_resp = &data->res,
2510                 .rpc_cred = data->cred,
2511         };
2512         struct nfs_server *server = NFS_SERVER(data->inode);
2513
2514         data->args.bitmask = server->attr_bitmask;
2515         data->res.server = server;
2516
2517         rpc_call_setup(&data->task, &msg, 0);
2518 }
2519
2520 /*
2521  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2522  * standalone procedure for queueing an asynchronous RENEW.
2523  */
2524 static void nfs4_renew_done(struct rpc_task *task, void *data)
2525 {
2526         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2527         unsigned long timestamp = (unsigned long)data;
2528
2529         if (task->tk_status < 0) {
2530                 switch (task->tk_status) {
2531                         case -NFS4ERR_STALE_CLIENTID:
2532                         case -NFS4ERR_EXPIRED:
2533                         case -NFS4ERR_CB_PATH_DOWN:
2534                                 nfs4_schedule_state_recovery(clp);
2535                 }
2536                 return;
2537         }
2538         spin_lock(&clp->cl_lock);
2539         if (time_before(clp->cl_last_renewal,timestamp))
2540                 clp->cl_last_renewal = timestamp;
2541         spin_unlock(&clp->cl_lock);
2542 }
2543
2544 static const struct rpc_call_ops nfs4_renew_ops = {
2545         .rpc_call_done = nfs4_renew_done,
2546 };
2547
2548 int nfs4_proc_async_renew(struct nfs4_client *clp, struct rpc_cred *cred)
2549 {
2550         struct rpc_message msg = {
2551                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2552                 .rpc_argp       = clp,
2553                 .rpc_cred       = cred,
2554         };
2555
2556         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2557                         &nfs4_renew_ops, (void *)jiffies);
2558 }
2559
2560 int nfs4_proc_renew(struct nfs4_client *clp, struct rpc_cred *cred)
2561 {
2562         struct rpc_message msg = {
2563                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2564                 .rpc_argp       = clp,
2565                 .rpc_cred       = cred,
2566         };
2567         unsigned long now = jiffies;
2568         int status;
2569
2570         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2571         if (status < 0)
2572                 return status;
2573         spin_lock(&clp->cl_lock);
2574         if (time_before(clp->cl_last_renewal,now))
2575                 clp->cl_last_renewal = now;
2576         spin_unlock(&clp->cl_lock);
2577         return 0;
2578 }
2579
2580 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2581 {
2582         return (server->caps & NFS_CAP_ACLS)
2583                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2584                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2585 }
2586
2587 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2588  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2589  * the stack.
2590  */
2591 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2592
2593 static void buf_to_pages(const void *buf, size_t buflen,
2594                 struct page **pages, unsigned int *pgbase)
2595 {
2596         const void *p = buf;
2597
2598         *pgbase = offset_in_page(buf);
2599         p -= *pgbase;
2600         while (p < buf + buflen) {
2601                 *(pages++) = virt_to_page(p);
2602                 p += PAGE_CACHE_SIZE;
2603         }
2604 }
2605
2606 struct nfs4_cached_acl {
2607         int cached;
2608         size_t len;
2609         char data[0];
2610 };
2611
2612 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2613 {
2614         struct nfs_inode *nfsi = NFS_I(inode);
2615
2616         spin_lock(&inode->i_lock);
2617         kfree(nfsi->nfs4_acl);
2618         nfsi->nfs4_acl = acl;
2619         spin_unlock(&inode->i_lock);
2620 }
2621
2622 static void nfs4_zap_acl_attr(struct inode *inode)
2623 {
2624         nfs4_set_cached_acl(inode, NULL);
2625 }
2626
2627 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2628 {
2629         struct nfs_inode *nfsi = NFS_I(inode);
2630         struct nfs4_cached_acl *acl;
2631         int ret = -ENOENT;
2632
2633         spin_lock(&inode->i_lock);
2634         acl = nfsi->nfs4_acl;
2635         if (acl == NULL)
2636                 goto out;
2637         if (buf == NULL) /* user is just asking for length */
2638                 goto out_len;
2639         if (acl->cached == 0)
2640                 goto out;
2641         ret = -ERANGE; /* see getxattr(2) man page */
2642         if (acl->len > buflen)
2643                 goto out;
2644         memcpy(buf, acl->data, acl->len);
2645 out_len:
2646         ret = acl->len;
2647 out:
2648         spin_unlock(&inode->i_lock);
2649         return ret;
2650 }
2651
2652 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2653 {
2654         struct nfs4_cached_acl *acl;
2655
2656         if (buf && acl_len <= PAGE_SIZE) {
2657                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2658                 if (acl == NULL)
2659                         goto out;
2660                 acl->cached = 1;
2661                 memcpy(acl->data, buf, acl_len);
2662         } else {
2663                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2664                 if (acl == NULL)
2665                         goto out;
2666                 acl->cached = 0;
2667         }
2668         acl->len = acl_len;
2669 out:
2670         nfs4_set_cached_acl(inode, acl);
2671 }
2672
2673 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2674 {
2675         struct page *pages[NFS4ACL_MAXPAGES];
2676         struct nfs_getaclargs args = {
2677                 .fh = NFS_FH(inode),
2678                 .acl_pages = pages,
2679                 .acl_len = buflen,
2680         };
2681         size_t resp_len = buflen;
2682         void *resp_buf;
2683         struct rpc_message msg = {
2684                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2685                 .rpc_argp = &args,
2686                 .rpc_resp = &resp_len,
2687         };
2688         struct page *localpage = NULL;
2689         int ret;
2690
2691         if (buflen < PAGE_SIZE) {
2692                 /* As long as we're doing a round trip to the server anyway,
2693                  * let's be prepared for a page of acl data. */
2694                 localpage = alloc_page(GFP_KERNEL);
2695                 resp_buf = page_address(localpage);
2696                 if (localpage == NULL)
2697                         return -ENOMEM;
2698                 args.acl_pages[0] = localpage;
2699                 args.acl_pgbase = 0;
2700                 resp_len = args.acl_len = PAGE_SIZE;
2701         } else {
2702                 resp_buf = buf;
2703                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2704         }
2705         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2706         if (ret)
2707                 goto out_free;
2708         if (resp_len > args.acl_len)
2709                 nfs4_write_cached_acl(inode, NULL, resp_len);
2710         else
2711                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2712         if (buf) {
2713                 ret = -ERANGE;
2714                 if (resp_len > buflen)
2715                         goto out_free;
2716                 if (localpage)
2717                         memcpy(buf, resp_buf, resp_len);
2718         }
2719         ret = resp_len;
2720 out_free:
2721         if (localpage)
2722                 __free_page(localpage);
2723         return ret;
2724 }
2725
2726 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2727 {
2728         struct nfs_server *server = NFS_SERVER(inode);
2729         int ret;
2730
2731         if (!nfs4_server_supports_acls(server))
2732                 return -EOPNOTSUPP;
2733         ret = nfs_revalidate_inode(server, inode);
2734         if (ret < 0)
2735                 return ret;
2736         ret = nfs4_read_cached_acl(inode, buf, buflen);
2737         if (ret != -ENOENT)
2738                 return ret;
2739         return nfs4_get_acl_uncached(inode, buf, buflen);
2740 }
2741
2742 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2743 {
2744         struct nfs_server *server = NFS_SERVER(inode);
2745         struct page *pages[NFS4ACL_MAXPAGES];
2746         struct nfs_setaclargs arg = {
2747                 .fh             = NFS_FH(inode),
2748                 .acl_pages      = pages,
2749                 .acl_len        = buflen,
2750         };
2751         struct rpc_message msg = {
2752                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2753                 .rpc_argp       = &arg,
2754                 .rpc_resp       = NULL,
2755         };
2756         int ret;
2757
2758         if (!nfs4_server_supports_acls(server))
2759                 return -EOPNOTSUPP;
2760         nfs_inode_return_delegation(inode);
2761         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2762         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2763         if (ret == 0)
2764                 nfs4_write_cached_acl(inode, buf, buflen);
2765         return ret;
2766 }
2767
2768 static int
2769 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2770 {
2771         struct nfs4_client *clp = server->nfs4_state;
2772
2773         if (!clp || task->tk_status >= 0)
2774                 return 0;
2775         switch(task->tk_status) {
2776                 case -NFS4ERR_STALE_CLIENTID:
2777                 case -NFS4ERR_STALE_STATEID:
2778                 case -NFS4ERR_EXPIRED:
2779                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2780                         nfs4_schedule_state_recovery(clp);
2781                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2782                                 rpc_wake_up_task(task);
2783                         task->tk_status = 0;
2784                         return -EAGAIN;
2785                 case -NFS4ERR_DELAY:
2786                         nfs_inc_server_stats((struct nfs_server *) server,
2787                                                 NFSIOS_DELAY);
2788                 case -NFS4ERR_GRACE:
2789                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2790                         task->tk_status = 0;
2791                         return -EAGAIN;
2792                 case -NFS4ERR_OLD_STATEID:
2793                         task->tk_status = 0;
2794                         return -EAGAIN;
2795         }
2796         task->tk_status = nfs4_map_errors(task->tk_status);
2797         return 0;
2798 }
2799
2800 static int nfs4_wait_bit_interruptible(void *word)
2801 {
2802         if (signal_pending(current))
2803                 return -ERESTARTSYS;
2804         schedule();
2805         return 0;
2806 }
2807
2808 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2809 {
2810         sigset_t oldset;
2811         int res;
2812
2813         might_sleep();
2814
2815         rpc_clnt_sigmask(clnt, &oldset);
2816         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2817                         nfs4_wait_bit_interruptible,
2818                         TASK_INTERRUPTIBLE);
2819         rpc_clnt_sigunmask(clnt, &oldset);
2820         return res;
2821 }
2822
2823 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2824 {
2825         sigset_t oldset;
2826         int res = 0;
2827
2828         might_sleep();
2829
2830         if (*timeout <= 0)
2831                 *timeout = NFS4_POLL_RETRY_MIN;
2832         if (*timeout > NFS4_POLL_RETRY_MAX)
2833                 *timeout = NFS4_POLL_RETRY_MAX;
2834         rpc_clnt_sigmask(clnt, &oldset);
2835         if (clnt->cl_intr) {
2836                 schedule_timeout_interruptible(*timeout);
2837                 if (signalled())
2838                         res = -ERESTARTSYS;
2839         } else
2840                 schedule_timeout_uninterruptible(*timeout);
2841         rpc_clnt_sigunmask(clnt, &oldset);
2842         *timeout <<= 1;
2843         return res;
2844 }
2845
2846 /* This is the error handling routine for processes that are allowed
2847  * to sleep.
2848  */
2849 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2850 {
2851         struct nfs4_client *clp = server->nfs4_state;
2852         int ret = errorcode;
2853
2854         exception->retry = 0;
2855         switch(errorcode) {
2856                 case 0:
2857                         return 0;
2858                 case -NFS4ERR_STALE_CLIENTID:
2859                 case -NFS4ERR_STALE_STATEID:
2860                 case -NFS4ERR_EXPIRED:
2861                         nfs4_schedule_state_recovery(clp);
2862                         ret = nfs4_wait_clnt_recover(server->client, clp);
2863                         if (ret == 0)
2864                                 exception->retry = 1;
2865                         break;
2866                 case -NFS4ERR_GRACE:
2867                 case -NFS4ERR_DELAY:
2868                         ret = nfs4_delay(server->client, &exception->timeout);
2869                         if (ret != 0)
2870                                 break;
2871                 case -NFS4ERR_OLD_STATEID:
2872                         exception->retry = 1;
2873         }
2874         /* We failed to handle the error */
2875         return nfs4_map_errors(ret);
2876 }
2877
2878 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2879 {
2880         nfs4_verifier sc_verifier;
2881         struct nfs4_setclientid setclientid = {
2882                 .sc_verifier = &sc_verifier,
2883                 .sc_prog = program,
2884         };
2885         struct rpc_message msg = {
2886                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2887                 .rpc_argp = &setclientid,
2888                 .rpc_resp = clp,
2889                 .rpc_cred = cred,
2890         };
2891         u32 *p;
2892         int loop = 0;
2893         int status;
2894
2895         p = (u32*)sc_verifier.data;
2896         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2897         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2898
2899         for(;;) {
2900                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2901                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2902                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2903                                 cred->cr_ops->cr_name,
2904                                 clp->cl_id_uniquifier);
2905                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2906                                 sizeof(setclientid.sc_netid), "tcp");
2907                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2908                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2909                                 clp->cl_ipaddr, port >> 8, port & 255);
2910
2911                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2912                 if (status != -NFS4ERR_CLID_INUSE)
2913                         break;
2914                 if (signalled())
2915                         break;
2916                 if (loop++ & 1)
2917                         ssleep(clp->cl_lease_time + 1);
2918                 else
2919                         if (++clp->cl_id_uniquifier == 0)
2920                                 break;
2921         }
2922         return status;
2923 }
2924
2925 static int _nfs4_proc_setclientid_confirm(struct nfs4_client *clp, struct rpc_cred *cred)
2926 {
2927         struct nfs_fsinfo fsinfo;
2928         struct rpc_message msg = {
2929                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2930                 .rpc_argp = clp,
2931                 .rpc_resp = &fsinfo,
2932                 .rpc_cred = cred,
2933         };
2934         unsigned long now;
2935         int status;
2936
2937         now = jiffies;
2938         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2939         if (status == 0) {
2940                 spin_lock(&clp->cl_lock);
2941                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2942                 clp->cl_last_renewal = now;
2943                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2944                 spin_unlock(&clp->cl_lock);
2945         }
2946         return status;
2947 }
2948
2949 int nfs4_proc_setclientid_confirm(struct nfs4_client *clp, struct rpc_cred *cred)
2950 {
2951         long timeout;
2952         int err;
2953         do {
2954                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2955                 switch (err) {
2956                         case 0:
2957                                 return err;
2958                         case -NFS4ERR_RESOURCE:
2959                                 /* The IBM lawyers misread another document! */
2960                         case -NFS4ERR_DELAY:
2961                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2962                 }
2963         } while (err == 0);
2964         return err;
2965 }
2966
2967 struct nfs4_delegreturndata {
2968         struct nfs4_delegreturnargs args;
2969         struct nfs4_delegreturnres res;
2970         struct nfs_fh fh;
2971         nfs4_stateid stateid;
2972         struct rpc_cred *cred;
2973         unsigned long timestamp;
2974         struct nfs_fattr fattr;
2975         int rpc_status;
2976 };
2977
2978 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2979 {
2980         struct nfs4_delegreturndata *data = calldata;
2981         struct rpc_message msg = {
2982                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2983                 .rpc_argp = &data->args,
2984                 .rpc_resp = &data->res,
2985                 .rpc_cred = data->cred,
2986         };
2987         nfs_fattr_init(data->res.fattr);
2988         rpc_call_setup(task, &msg, 0);
2989 }
2990
2991 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2992 {
2993         struct nfs4_delegreturndata *data = calldata;
2994         data->rpc_status = task->tk_status;
2995         if (data->rpc_status == 0)
2996                 renew_lease(data->res.server, data->timestamp);
2997 }
2998
2999 static void nfs4_delegreturn_release(void *calldata)
3000 {
3001         struct nfs4_delegreturndata *data = calldata;
3002
3003         put_rpccred(data->cred);
3004         kfree(calldata);
3005 }
3006
3007 static const struct rpc_call_ops nfs4_delegreturn_ops = {
3008         .rpc_call_prepare = nfs4_delegreturn_prepare,
3009         .rpc_call_done = nfs4_delegreturn_done,
3010         .rpc_release = nfs4_delegreturn_release,
3011 };
3012
3013 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3014 {
3015         struct nfs4_delegreturndata *data;
3016         struct nfs_server *server = NFS_SERVER(inode);
3017         struct rpc_task *task;
3018         int status;
3019
3020         data = kmalloc(sizeof(*data), GFP_KERNEL);
3021         if (data == NULL)
3022                 return -ENOMEM;
3023         data->args.fhandle = &data->fh;
3024         data->args.stateid = &data->stateid;
3025         data->args.bitmask = server->attr_bitmask;
3026         nfs_copy_fh(&data->fh, NFS_FH(inode));
3027         memcpy(&data->stateid, stateid, sizeof(data->stateid));
3028         data->res.fattr = &data->fattr;
3029         data->res.server = server;
3030         data->cred = get_rpccred(cred);
3031         data->timestamp = jiffies;
3032         data->rpc_status = 0;
3033
3034         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
3035         if (IS_ERR(task))
3036                 return PTR_ERR(task);
3037         status = nfs4_wait_for_completion_rpc_task(task);
3038         if (status == 0) {
3039                 status = data->rpc_status;
3040                 if (status == 0)
3041                         nfs_post_op_update_inode(inode, &data->fattr);
3042         }
3043         rpc_release_task(task);
3044         return status;
3045 }
3046
3047 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3048 {
3049         struct nfs_server *server = NFS_SERVER(inode);
3050         struct nfs4_exception exception = { };
3051         int err;
3052         do {
3053                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3054                 switch (err) {
3055                         case -NFS4ERR_STALE_STATEID:
3056                         case -NFS4ERR_EXPIRED:
3057                                 nfs4_schedule_state_recovery(server->nfs4_state);
3058                         case 0:
3059                                 return 0;
3060                 }
3061                 err = nfs4_handle_exception(server, err, &exception);
3062         } while (exception.retry);
3063         return err;
3064 }
3065
3066 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3067 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3068
3069 /*
3070  * sleep, with exponential backoff, and retry the LOCK operation.
3071  */
3072 static unsigned long
3073 nfs4_set_lock_task_retry(unsigned long timeout)
3074 {
3075         schedule_timeout_interruptible(timeout);
3076         timeout <<= 1;
3077         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3078                 return NFS4_LOCK_MAXTIMEOUT;
3079         return timeout;
3080 }
3081
3082 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3083 {
3084         struct inode *inode = state->inode;
3085         struct nfs_server *server = NFS_SERVER(inode);
3086         struct nfs4_client *clp = server->nfs4_state;
3087         struct nfs_lockt_args arg = {
3088                 .fh = NFS_FH(inode),
3089                 .fl = request,
3090         };
3091         struct nfs_lockt_res res = {
3092                 .denied = request,
3093         };
3094         struct rpc_message msg = {
3095                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3096                 .rpc_argp       = &arg,
3097                 .rpc_resp       = &res,
3098                 .rpc_cred       = state->owner->so_cred,
3099         };
3100         struct nfs4_lock_state *lsp;
3101         int status;
3102
3103         down_read(&clp->cl_sem);
3104         arg.lock_owner.clientid = clp->cl_clientid;
3105         status = nfs4_set_lock_state(state, request);
3106         if (status != 0)
3107                 goto out;
3108         lsp = request->fl_u.nfs4_fl.owner;
3109         arg.lock_owner.id = lsp->ls_id;
3110         status = rpc_call_sync(server->client, &msg, 0);
3111         switch (status) {
3112                 case 0:
3113                         request->fl_type = F_UNLCK;
3114                         break;
3115                 case -NFS4ERR_DENIED:
3116                         status = 0;
3117         }
3118 out:
3119         up_read(&clp->cl_sem);
3120         return status;
3121 }
3122
3123 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3124 {
3125         struct nfs4_exception exception = { };
3126         int err;
3127
3128         do {
3129                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3130                                 _nfs4_proc_getlk(state, cmd, request),
3131                                 &exception);
3132         } while (exception.retry);
3133         return err;
3134 }
3135
3136 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3137 {
3138         int res = 0;
3139         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3140                 case FL_POSIX:
3141                         res = posix_lock_file_wait(file, fl);
3142                         break;
3143                 case FL_FLOCK:
3144                         res = flock_lock_file_wait(file, fl);
3145                         break;
3146                 default:
3147                         BUG();
3148         }
3149         if (res < 0)
3150                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
3151                                 __FUNCTION__);
3152         return res;
3153 }
3154
3155 struct nfs4_unlockdata {
3156         struct nfs_locku_args arg;
3157         struct nfs_locku_res res;
3158         struct nfs4_lock_state *lsp;
3159         struct nfs_open_context *ctx;
3160         struct file_lock fl;
3161         const struct nfs_server *server;
3162         unsigned long timestamp;
3163 };
3164
3165 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3166                 struct nfs_open_context *ctx,
3167                 struct nfs4_lock_state *lsp,
3168                 struct nfs_seqid *seqid)
3169 {
3170         struct nfs4_unlockdata *p;
3171         struct inode *inode = lsp->ls_state->inode;
3172
3173         p = kmalloc(sizeof(*p), GFP_KERNEL);
3174         if (p == NULL)
3175                 return NULL;
3176         p->arg.fh = NFS_FH(inode);
3177         p->arg.fl = &p->fl;
3178         p->arg.seqid = seqid;
3179         p->arg.stateid = &lsp->ls_stateid;
3180         p->lsp = lsp;
3181         atomic_inc(&lsp->ls_count);
3182         /* Ensure we don't close file until we're done freeing locks! */
3183         p->ctx = get_nfs_open_context(ctx);
3184         memcpy(&p->fl, fl, sizeof(p->fl));
3185         p->server = NFS_SERVER(inode);
3186         return p;
3187 }
3188
3189 static void nfs4_locku_release_calldata(void *data)
3190 {
3191         struct nfs4_unlockdata *calldata = data;
3192         nfs_free_seqid(calldata->arg.seqid);
3193         nfs4_put_lock_state(calldata->lsp);
3194         put_nfs_open_context(calldata->ctx);
3195         kfree(calldata);
3196 }
3197
3198 static void nfs4_locku_done(struct rpc_task *task, void *data)
3199 {
3200         struct nfs4_unlockdata *calldata = data;
3201
3202         if (RPC_ASSASSINATED(task))
3203                 return;
3204         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3205         switch (task->tk_status) {
3206                 case 0:
3207                         memcpy(calldata->lsp->ls_stateid.data,
3208                                         calldata->res.stateid.data,
3209                                         sizeof(calldata->lsp->ls_stateid.data));
3210                         renew_lease(calldata->server, calldata->timestamp);
3211                         break;
3212                 case -NFS4ERR_STALE_STATEID:
3213                 case -NFS4ERR_EXPIRED:
3214                         nfs4_schedule_state_recovery(calldata->server->nfs4_state);
3215                         break;
3216                 default:
3217                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) {
3218                                 rpc_restart_call(task);
3219                         }
3220         }
3221 }
3222
3223 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3224 {
3225         struct nfs4_unlockdata *calldata = data;
3226         struct rpc_message msg = {
3227                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3228                 .rpc_argp       = &calldata->arg,
3229                 .rpc_resp       = &calldata->res,
3230                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3231         };
3232
3233         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3234                 return;
3235         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3236                 /* Note: exit _without_ running nfs4_locku_done */
3237                 task->tk_action = NULL;
3238                 return;
3239         }
3240         calldata->timestamp = jiffies;
3241         rpc_call_setup(task, &msg, 0);
3242 }
3243
3244 static const struct rpc_call_ops nfs4_locku_ops = {
3245         .rpc_call_prepare = nfs4_locku_prepare,
3246         .rpc_call_done = nfs4_locku_done,
3247         .rpc_release = nfs4_locku_release_calldata,
3248 };
3249
3250 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3251                 struct nfs_open_context *ctx,
3252                 struct nfs4_lock_state *lsp,
3253                 struct nfs_seqid *seqid)
3254 {
3255         struct nfs4_unlockdata *data;
3256
3257         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3258         if (data == NULL) {
3259                 nfs_free_seqid(seqid);
3260                 return ERR_PTR(-ENOMEM);
3261         }
3262
3263         /* Unlock _before_ we do the RPC call */
3264         do_vfs_lock(fl->fl_file, fl);
3265         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3266 }
3267
3268 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3269 {
3270         struct nfs_seqid *seqid;
3271         struct nfs4_lock_state *lsp;
3272         struct rpc_task *task;
3273         int status = 0;
3274
3275         /* Is this a delegated lock? */
3276         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3277                 goto out_unlock;
3278         /* Is this open_owner holding any locks on the server? */
3279         if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
3280                 goto out_unlock;
3281
3282         status = nfs4_set_lock_state(state, request);
3283         if (status != 0)
3284                 goto out_unlock;
3285         lsp = request->fl_u.nfs4_fl.owner;
3286         status = -ENOMEM;
3287         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3288         if (seqid == NULL)
3289                 goto out_unlock;
3290         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3291         status = PTR_ERR(task);
3292         if (IS_ERR(task))
3293                 goto out_unlock;
3294         status = nfs4_wait_for_completion_rpc_task(task);
3295         rpc_release_task(task);
3296         return status;
3297 out_unlock:
3298         do_vfs_lock(request->fl_file, request);
3299         return status;
3300 }
3301
3302 struct nfs4_lockdata {
3303         struct nfs_lock_args arg;
3304         struct nfs_lock_res res;
3305         struct nfs4_lock_state *lsp;
3306         struct nfs_open_context *ctx;
3307         struct file_lock fl;
3308         unsigned long timestamp;
3309         int rpc_status;
3310         int cancelled;
3311 };
3312
3313 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3314                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3315 {
3316         struct nfs4_lockdata *p;
3317         struct inode *inode = lsp->ls_state->inode;
3318         struct nfs_server *server = NFS_SERVER(inode);
3319
3320         p = kzalloc(sizeof(*p), GFP_KERNEL);
3321         if (p == NULL)
3322                 return NULL;
3323
3324         p->arg.fh = NFS_FH(inode);
3325         p->arg.fl = &p->fl;
3326         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3327         if (p->arg.lock_seqid == NULL)
3328                 goto out_free;
3329         p->arg.lock_stateid = &lsp->ls_stateid;
3330         p->arg.lock_owner.clientid = server->nfs4_state->cl_clientid;
3331         p->arg.lock_owner.id = lsp->ls_id;
3332         p->lsp = lsp;
3333         atomic_inc(&lsp->ls_count);
3334         p->ctx = get_nfs_open_context(ctx);
3335         memcpy(&p->fl, fl, sizeof(p->fl));
3336         return p;
3337 out_free:
3338         kfree(p);
3339         return NULL;
3340 }
3341
3342 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3343 {
3344         struct nfs4_lockdata *data = calldata;
3345         struct nfs4_state *state = data->lsp->ls_state;
3346         struct nfs4_state_owner *sp = state->owner;
3347         struct rpc_message msg = {
3348                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3349                 .rpc_argp = &data->arg,
3350                 .rpc_resp = &data->res,
3351                 .rpc_cred = sp->so_cred,
3352         };
3353
3354         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3355                 return;
3356         dprintk("%s: begin!\n", __FUNCTION__);
3357         /* Do we need to do an open_to_lock_owner? */
3358         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3359                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3360                 if (data->arg.open_seqid == NULL) {
3361                         data->rpc_status = -ENOMEM;
3362                         task->tk_action = NULL;
3363                         goto out;
3364                 }
3365                 data->arg.open_stateid = &state->stateid;
3366                 data->arg.new_lock_owner = 1;
3367         }
3368         data->timestamp = jiffies;
3369         rpc_call_setup(task, &msg, 0);
3370 out:
3371         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3372 }
3373
3374 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3375 {
3376         struct nfs4_lockdata *data = calldata;
3377
3378         dprintk("%s: begin!\n", __FUNCTION__);
3379
3380         data->rpc_status = task->tk_status;
3381         if (RPC_ASSASSINATED(task))
3382                 goto out;
3383         if (data->arg.new_lock_owner != 0) {
3384                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3385                 if (data->rpc_status == 0)
3386                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3387                 else
3388                         goto out;
3389         }
3390         if (data->rpc_status == 0) {
3391                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3392                                         sizeof(data->lsp->ls_stateid.data));
3393                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3394                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
3395         }
3396         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3397 out:
3398         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3399 }
3400
3401 static void nfs4_lock_release(void *calldata)
3402 {
3403         struct nfs4_lockdata *data = calldata;
3404
3405         dprintk("%s: begin!\n", __FUNCTION__);
3406         if (data->arg.open_seqid != NULL)
3407                 nfs_free_seqid(data->arg.open_seqid);
3408         if (data->cancelled != 0) {
3409                 struct rpc_task *task;
3410                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3411                                 data->arg.lock_seqid);
3412                 if (!IS_ERR(task))
3413                         rpc_release_task(task);
3414                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3415         } else
3416                 nfs_free_seqid(data->arg.lock_seqid);
3417         nfs4_put_lock_state(data->lsp);
3418         put_nfs_open_context(data->ctx);
3419         kfree(data);
3420         dprintk("%s: done!\n", __FUNCTION__);
3421 }
3422
3423 static const struct rpc_call_ops nfs4_lock_ops = {
3424         .rpc_call_prepare = nfs4_lock_prepare,
3425         .rpc_call_done = nfs4_lock_done,
3426         .rpc_release = nfs4_lock_release,
3427 };
3428
3429 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3430 {
3431         struct nfs4_lockdata *data;
3432         struct rpc_task *task;
3433         int ret;
3434
3435         dprintk("%s: begin!\n", __FUNCTION__);
3436         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3437                         fl->fl_u.nfs4_fl.owner);
3438         if (data == NULL)
3439                 return -ENOMEM;
3440         if (IS_SETLKW(cmd))
3441                 data->arg.block = 1;
3442         if (reclaim != 0)
3443                 data->arg.reclaim = 1;
3444         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3445                         &nfs4_lock_ops, data);
3446         if (IS_ERR(task))
3447                 return PTR_ERR(task);
3448         ret = nfs4_wait_for_completion_rpc_task(task);
3449         if (ret == 0) {
3450                 ret = data->rpc_status;
3451                 if (ret == -NFS4ERR_DENIED)
3452                         ret = -EAGAIN;
3453         } else
3454                 data->cancelled = 1;
3455         rpc_release_task(task);
3456         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3457         return ret;
3458 }
3459
3460 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3461 {
3462         struct nfs_server *server = NFS_SERVER(state->inode);
3463         struct nfs4_exception exception = { };
3464         int err;
3465
3466         /* Cache the lock if possible... */
3467         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3468                 return 0;
3469         do {
3470                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3471                 if (err != -NFS4ERR_DELAY)
3472                         break;
3473                 nfs4_handle_exception(server, err, &exception);
3474         } while (exception.retry);
3475         return err;
3476 }
3477
3478 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3479 {
3480         struct nfs_server *server = NFS_SERVER(state->inode);
3481         struct nfs4_exception exception = { };
3482         int err;
3483
3484         err = nfs4_set_lock_state(state, request);
3485         if (err != 0)
3486                 return err;
3487         do {
3488                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3489                 if (err != -NFS4ERR_DELAY)
3490                         break;
3491                 nfs4_handle_exception(server, err, &exception);
3492         } while (exception.retry);
3493         return err;
3494 }
3495
3496 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3497 {
3498         struct nfs4_client *clp = state->owner->so_client;
3499         int status;
3500
3501         /* Is this a delegated open? */
3502         if (NFS_I(state->inode)->delegation_state != 0) {
3503                 /* Yes: cache locks! */
3504                 status = do_vfs_lock(request->fl_file, request);
3505                 /* ...but avoid races with delegation recall... */
3506                 if (status < 0 || test_bit(NFS_DELEGATED_STATE, &state->flags))
3507                         return status;
3508         }
3509         down_read(&clp->cl_sem);
3510         status = nfs4_set_lock_state(state, request);
3511         if (status != 0)
3512                 goto out;
3513         status = _nfs4_do_setlk(state, cmd, request, 0);
3514         if (status != 0)
3515                 goto out;
3516         /* Note: we always want to sleep here! */
3517         request->fl_flags |= FL_SLEEP;
3518         if (do_vfs_lock(request->fl_file, request) < 0)
3519                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3520 out:
3521         up_read(&clp->cl_sem);
3522         return status;
3523 }
3524
3525 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3526 {
3527         struct nfs4_exception exception = { };
3528         int err;
3529
3530         do {
3531                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3532                                 _nfs4_proc_setlk(state, cmd, request),
3533                                 &exception);
3534         } while (exception.retry);
3535         return err;
3536 }
3537
3538 static int
3539 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3540 {
3541         struct nfs_open_context *ctx;
3542         struct nfs4_state *state;
3543         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3544         int status;
3545
3546         /* verify open state */
3547         ctx = (struct nfs_open_context *)filp->private_data;
3548         state = ctx->state;
3549
3550         if (request->fl_start < 0 || request->fl_end < 0)
3551                 return -EINVAL;
3552
3553         if (IS_GETLK(cmd))
3554                 return nfs4_proc_getlk(state, F_GETLK, request);
3555
3556         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3557                 return -EINVAL;
3558
3559         if (request->fl_type == F_UNLCK)
3560                 return nfs4_proc_unlck(state, cmd, request);
3561
3562         do {
3563                 status = nfs4_proc_setlk(state, cmd, request);
3564                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3565                         break;
3566                 timeout = nfs4_set_lock_task_retry(timeout);
3567                 status = -ERESTARTSYS;
3568                 if (signalled())
3569                         break;
3570         } while(status < 0);
3571         return status;
3572 }
3573
3574 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3575 {
3576         struct nfs_server *server = NFS_SERVER(state->inode);
3577         struct nfs4_exception exception = { };
3578         int err;
3579
3580         err = nfs4_set_lock_state(state, fl);
3581         if (err != 0)
3582                 goto out;
3583         do {
3584                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3585                 if (err != -NFS4ERR_DELAY)
3586                         break;
3587                 err = nfs4_handle_exception(server, err, &exception);
3588         } while (exception.retry);
3589 out:
3590         return err;
3591 }
3592
3593 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3594
3595 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3596                 size_t buflen, int flags)
3597 {
3598         struct inode *inode = dentry->d_inode;
3599
3600         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3601                 return -EOPNOTSUPP;
3602
3603         if (!S_ISREG(inode->i_mode) &&
3604             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3605                 return -EPERM;
3606
3607         return nfs4_proc_set_acl(inode, buf, buflen);
3608 }
3609
3610 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3611  * and that's what we'll do for e.g. user attributes that haven't been set.
3612  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3613  * attributes in kernel-managed attribute namespaces. */
3614 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3615                 size_t buflen)
3616 {
3617         struct inode *inode = dentry->d_inode;
3618
3619         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3620                 return -EOPNOTSUPP;
3621
3622         return nfs4_proc_get_acl(inode, buf, buflen);
3623 }
3624
3625 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3626 {
3627         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3628
3629         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3630                 return 0;
3631         if (buf && buflen < len)
3632                 return -ERANGE;
3633         if (buf)
3634                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3635         return len;
3636 }
3637
3638 int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
3639                 struct nfs4_fs_locations *fs_locations, struct page *page)
3640 {
3641         struct nfs_server *server = NFS_SERVER(dir);
3642         u32 bitmask[2] = {
3643                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3644                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3645         };
3646         struct nfs4_fs_locations_arg args = {
3647                 .dir_fh = NFS_FH(dir),
3648                 .name = &dentry->d_name,
3649                 .page = page,
3650                 .bitmask = bitmask,
3651         };
3652         struct rpc_message msg = {
3653                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3654                 .rpc_argp = &args,
3655                 .rpc_resp = fs_locations,
3656         };
3657         int status;
3658
3659         dprintk("%s: start\n", __FUNCTION__);
3660         fs_locations->fattr.valid = 0;
3661         fs_locations->server = server;
3662         fs_locations->nlocations = 0;
3663         status = rpc_call_sync(server->client, &msg, 0);
3664         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3665         return status;
3666 }
3667
3668 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3669         .recover_open   = nfs4_open_reclaim,
3670         .recover_lock   = nfs4_lock_reclaim,
3671 };
3672
3673 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3674         .recover_open   = nfs4_open_expired,
3675         .recover_lock   = nfs4_lock_expired,
3676 };
3677
3678 static struct inode_operations nfs4_file_inode_operations = {
3679         .permission     = nfs_permission,
3680         .getattr        = nfs_getattr,
3681         .setattr        = nfs_setattr,
3682         .getxattr       = nfs4_getxattr,
3683         .setxattr       = nfs4_setxattr,
3684         .listxattr      = nfs4_listxattr,
3685 };
3686
3687 struct nfs_rpc_ops      nfs_v4_clientops = {
3688         .version        = 4,                    /* protocol version */
3689         .dentry_ops     = &nfs4_dentry_operations,
3690         .dir_inode_ops  = &nfs4_dir_inode_operations,
3691         .file_inode_ops = &nfs4_file_inode_operations,
3692         .getroot        = nfs4_proc_get_root,
3693         .getattr        = nfs4_proc_getattr,
3694         .setattr        = nfs4_proc_setattr,
3695         .lookup         = nfs4_proc_lookup,
3696         .access         = nfs4_proc_access,
3697         .readlink       = nfs4_proc_readlink,
3698         .read           = nfs4_proc_read,
3699         .write          = nfs4_proc_write,
3700         .commit         = nfs4_proc_commit,
3701         .create         = nfs4_proc_create,
3702         .remove         = nfs4_proc_remove,
3703         .unlink_setup   = nfs4_proc_unlink_setup,
3704         .unlink_done    = nfs4_proc_unlink_done,
3705         .rename         = nfs4_proc_rename,
3706         .link           = nfs4_proc_link,
3707         .symlink        = nfs4_proc_symlink,
3708         .mkdir          = nfs4_proc_mkdir,
3709         .rmdir          = nfs4_proc_remove,
3710         .readdir        = nfs4_proc_readdir,
3711         .mknod          = nfs4_proc_mknod,
3712         .statfs         = nfs4_proc_statfs,
3713         .fsinfo         = nfs4_proc_fsinfo,
3714         .pathconf       = nfs4_proc_pathconf,
3715         .decode_dirent  = nfs4_decode_dirent,
3716         .read_setup     = nfs4_proc_read_setup,
3717         .read_done      = nfs4_read_done,
3718         .write_setup    = nfs4_proc_write_setup,
3719         .write_done     = nfs4_write_done,
3720         .commit_setup   = nfs4_proc_commit_setup,
3721         .commit_done    = nfs4_commit_done,
3722         .file_open      = nfs_open,
3723         .file_release   = nfs_release,
3724         .lock           = nfs4_proc_lock,
3725         .clear_acl_cache = nfs4_zap_acl_attr,
3726 };
3727
3728 /*
3729  * Local variables:
3730  *  c-basic-offset: 8
3731  * End:
3732  */