fs/nfs/nfs4proc.c

   1 /*
   2  *  fs/nfs/nfs4proc.c
   3  *
   4  *  Client-side procedure declarations for NFSv4.
   5  *
   6  *  Copyright (c) 2002 The Regents of the University of Michigan.
   7  *  All rights reserved.
   8  *
   9  *  Kendrick Smith <kmsmith@umich.edu>
  10  *  Andy Adamson   <andros@umich.edu>
  11  *
  12  *  Redistribution and use in source and binary forms, with or without
  13  *  modification, are permitted provided that the following conditions
  14  *  are met:
  15  *
  16  *  1. Redistributions of source code must retain the above copyright
  17  *     notice, this list of conditions and the following disclaimer.
  18  *  2. Redistributions in binary form must reproduce the above copyright
  19  *     notice, this list of conditions and the following disclaimer in the
  20  *     documentation and/or other materials provided with the distribution.
  21  *  3. Neither the name of the University nor the names of its
  22  *     contributors may be used to endorse or promote products derived
  23  *     from this software without specific prior written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  26  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  27  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  28  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  33  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  34  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  35  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/mm.h>
  39 #include <linux/utsname.h>
  40 #include <linux/delay.h>
  41 #include <linux/errno.h>
  42 #include <linux/string.h>
  43 #include <linux/sunrpc/clnt.h>
  44 #include <linux/nfs.h>
  45 #include <linux/nfs4.h>
  46 #include <linux/nfs_fs.h>
  47 #include <linux/nfs_page.h>
  48 #include <linux/smp_lock.h>
  49 #include <linux/namei.h>
  50 #include <linux/mount.h>
  51
  52 #include "nfs4_fs.h"
  53 #include "delegation.h"
  54 #include "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 static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1466 {
1467         struct nfs4_getattr_arg args = {
1468                 .fh = fhandle,
1469                 .bitmask = server->attr_bitmask,
1470         };
1471         struct nfs4_getattr_res res = {
1472                 .fattr = fattr,
1473                 .server = server,
1474         };
1475         struct rpc_message msg = {
1476                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
1477                 .rpc_argp = &args,
1478                 .rpc_resp = &res,
1479         };
1480
1481         nfs_fattr_init(fattr);
1482         return rpc_call_sync(server->client, &msg, 0);
1483 }
1484
1485 static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1486 {
1487         struct nfs4_exception exception = { };
1488         int err;
1489         do {
1490                 err = nfs4_handle_exception(server,
1491                                 _nfs4_proc_getattr(server, fhandle, fattr),
1492                                 &exception);
1493         } while (exception.retry);
1494         return err;
1495 }
1496
1497 /*
1498  * The file is not closed if it is opened due to the a request to change
1499  * the size of the file. The open call will not be needed once the
1500  * VFS layer lookup-intents are implemented.
1501  *
1502  * Close is called when the inode is destroyed.
1503  * If we haven't opened the file for O_WRONLY, we
1504  * need to in the size_change case to obtain a stateid.
1505  *
1506  * Got race?
1507  * Because OPEN is always done by name in nfsv4, it is
1508  * possible that we opened a different file by the same
1509  * name.  We can recognize this race condition, but we
1510  * can't do anything about it besides returning an error.
1511  *
1512  * This will be fixed with VFS changes (lookup-intent).
1513  */
1514 static int
1515 nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
1516                   struct iattr *sattr)
1517 {
1518         struct rpc_cred *cred;
1519         struct inode *inode = dentry->d_inode;
1520         struct nfs_open_context *ctx;
1521         struct nfs4_state *state = NULL;
1522         int status;
1523
1524         nfs_fattr_init(fattr);
1525
1526         cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0);
1527         if (IS_ERR(cred))
1528                 return PTR_ERR(cred);
1529
1530         /* Search for an existing open(O_WRITE) file */
1531         ctx = nfs_find_open_context(inode, cred, FMODE_WRITE);
1532         if (ctx != NULL)
1533                 state = ctx->state;
1534
1535         status = nfs4_do_setattr(inode, fattr, sattr, state);
1536         if (status == 0)
1537                 nfs_setattr_update_inode(inode, sattr);
1538         if (ctx != NULL)
1539                 put_nfs_open_context(ctx);
1540         put_rpccred(cred);
1541         return status;
1542 }
1543
1544 static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name,
1545                 struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1546 {
1547         int                    status;
1548         struct nfs_server *server = NFS_SERVER(dir);
1549         struct nfs4_lookup_arg args = {
1550                 .bitmask = server->attr_bitmask,
1551                 .dir_fh = NFS_FH(dir),
1552                 .name = name,
1553         };
1554         struct nfs4_lookup_res res = {
1555                 .server = server,
1556                 .fattr = fattr,
1557                 .fh = fhandle,
1558         };
1559         struct rpc_message msg = {
1560                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
1561                 .rpc_argp = &args,
1562                 .rpc_resp = &res,
1563         };
1564
1565         nfs_fattr_init(fattr);
1566
1567         dprintk("NFS call  lookup %s\n", name->name);
1568         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
1569         dprintk("NFS reply lookup: %d\n", status);
1570         return status;
1571 }
1572
1573 static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr)
1574 {
1575         struct nfs4_exception exception = { };
1576         int err;
1577         do {
1578                 err = nfs4_handle_exception(NFS_SERVER(dir),
1579                                 _nfs4_proc_lookup(dir, name, fhandle, fattr),
1580                                 &exception);
1581         } while (exception.retry);
1582         return err;
1583 }
1584
1585 static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1586 {
1587         struct nfs4_accessargs args = {
1588                 .fh = NFS_FH(inode),
1589         };
1590         struct nfs4_accessres res = { 0 };
1591         struct rpc_message msg = {
1592                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
1593                 .rpc_argp = &args,
1594                 .rpc_resp = &res,
1595                 .rpc_cred = entry->cred,
1596         };
1597         int mode = entry->mask;
1598         int status;
1599
1600         /*
1601          * Determine which access bits we want to ask for...
1602          */
1603         if (mode & MAY_READ)
1604                 args.access |= NFS4_ACCESS_READ;
1605         if (S_ISDIR(inode->i_mode)) {
1606                 if (mode & MAY_WRITE)
1607                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE;
1608                 if (mode & MAY_EXEC)
1609                         args.access |= NFS4_ACCESS_LOOKUP;
1610         } else {
1611                 if (mode & MAY_WRITE)
1612                         args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND;
1613                 if (mode & MAY_EXEC)
1614                         args.access |= NFS4_ACCESS_EXECUTE;
1615         }
1616         status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1617         if (!status) {
1618                 entry->mask = 0;
1619                 if (res.access & NFS4_ACCESS_READ)
1620                         entry->mask |= MAY_READ;
1621                 if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE))
1622                         entry->mask |= MAY_WRITE;
1623                 if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE))
1624                         entry->mask |= MAY_EXEC;
1625         }
1626         return status;
1627 }
1628
1629 static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
1630 {
1631         struct nfs4_exception exception = { };
1632         int err;
1633         do {
1634                 err = nfs4_handle_exception(NFS_SERVER(inode),
1635                                 _nfs4_proc_access(inode, entry),
1636                                 &exception);
1637         } while (exception.retry);
1638         return err;
1639 }
1640
1641 /*
1642  * TODO: For the time being, we don't try to get any attributes
1643  * along with any of the zero-copy operations READ, READDIR,
1644  * READLINK, WRITE.
1645  *
1646  * In the case of the first three, we want to put the GETATTR
1647  * after the read-type operation -- this is because it is hard
1648  * to predict the length of a GETATTR response in v4, and thus
1649  * align the READ data correctly.  This means that the GETATTR
1650  * may end up partially falling into the page cache, and we should
1651  * shift it into the 'tail' of the xdr_buf before processing.
1652  * To do this efficiently, we need to know the total length
1653  * of data received, which doesn't seem to be available outside
1654  * of the RPC layer.
1655  *
1656  * In the case of WRITE, we also want to put the GETATTR after
1657  * the operation -- in this case because we want to make sure
1658  * we get the post-operation mtime and size.  This means that
1659  * we can't use xdr_encode_pages() as written: we need a variant
1660  * of it which would leave room in the 'tail' iovec.
1661  *
1662  * Both of these changes to the XDR layer would in fact be quite
1663  * minor, but I decided to leave them for a subsequent patch.
1664  */
1665 static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
1666                 unsigned int pgbase, unsigned int pglen)
1667 {
1668         struct nfs4_readlink args = {
1669                 .fh       = NFS_FH(inode),
1670                 .pgbase   = pgbase,
1671                 .pglen    = pglen,
1672                 .pages    = &page,
1673         };
1674         struct rpc_message msg = {
1675                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
1676                 .rpc_argp = &args,
1677                 .rpc_resp = NULL,
1678         };
1679
1680         return rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
1681 }
1682
1683 static int nfs4_proc_readlink(struct inode *inode, struct page *page,
1684                 unsigned int pgbase, unsigned int pglen)
1685 {
1686         struct nfs4_exception exception = { };
1687         int err;
1688         do {
1689                 err = nfs4_handle_exception(NFS_SERVER(inode),
1690                                 _nfs4_proc_readlink(inode, page, pgbase, pglen),
1691                                 &exception);
1692         } while (exception.retry);
1693         return err;
1694 }
1695
1696 static int _nfs4_proc_read(struct nfs_read_data *rdata)
1697 {
1698         int flags = rdata->flags;
1699         struct inode *inode = rdata->inode;
1700         struct nfs_fattr *fattr = rdata->res.fattr;
1701         struct nfs_server *server = NFS_SERVER(inode);
1702         struct rpc_message msg = {
1703                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_READ],
1704                 .rpc_argp       = &rdata->args,
1705                 .rpc_resp       = &rdata->res,
1706                 .rpc_cred       = rdata->cred,
1707         };
1708         unsigned long timestamp = jiffies;
1709         int status;
1710
1711         dprintk("NFS call  read %d @ %Ld\n", rdata->args.count,
1712                         (long long) rdata->args.offset);
1713
1714         nfs_fattr_init(fattr);
1715         status = rpc_call_sync(server->client, &msg, flags);
1716         if (!status)
1717                 renew_lease(server, timestamp);
1718         dprintk("NFS reply read: %d\n", status);
1719         return status;
1720 }
1721
1722 static int nfs4_proc_read(struct nfs_read_data *rdata)
1723 {
1724         struct nfs4_exception exception = { };
1725         int err;
1726         do {
1727                 err = nfs4_handle_exception(NFS_SERVER(rdata->inode),
1728                                 _nfs4_proc_read(rdata),
1729                                 &exception);
1730         } while (exception.retry);
1731         return err;
1732 }
1733
1734 static int _nfs4_proc_write(struct nfs_write_data *wdata)
1735 {
1736         int rpcflags = wdata->flags;
1737         struct inode *inode = wdata->inode;
1738         struct nfs_fattr *fattr = wdata->res.fattr;
1739         struct nfs_server *server = NFS_SERVER(inode);
1740         struct rpc_message msg = {
1741                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
1742                 .rpc_argp       = &wdata->args,
1743                 .rpc_resp       = &wdata->res,
1744                 .rpc_cred       = wdata->cred,
1745         };
1746         int status;
1747
1748         dprintk("NFS call  write %d @ %Ld\n", wdata->args.count,
1749                         (long long) wdata->args.offset);
1750
1751         wdata->args.bitmask = server->attr_bitmask;
1752         wdata->res.server = server;
1753         wdata->timestamp = jiffies;
1754         nfs_fattr_init(fattr);
1755         status = rpc_call_sync(server->client, &msg, rpcflags);
1756         dprintk("NFS reply write: %d\n", status);
1757         if (status < 0)
1758                 return status;
1759         renew_lease(server, wdata->timestamp);
1760         nfs_post_op_update_inode(inode, fattr);
1761         return wdata->res.count;
1762 }
1763
1764 static int nfs4_proc_write(struct nfs_write_data *wdata)
1765 {
1766         struct nfs4_exception exception = { };
1767         int err;
1768         do {
1769                 err = nfs4_handle_exception(NFS_SERVER(wdata->inode),
1770                                 _nfs4_proc_write(wdata),
1771                                 &exception);
1772         } while (exception.retry);
1773         return err;
1774 }
1775
1776 static int _nfs4_proc_commit(struct nfs_write_data *cdata)
1777 {
1778         struct inode *inode = cdata->inode;
1779         struct nfs_fattr *fattr = cdata->res.fattr;
1780         struct nfs_server *server = NFS_SERVER(inode);
1781         struct rpc_message msg = {
1782                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
1783                 .rpc_argp       = &cdata->args,
1784                 .rpc_resp       = &cdata->res,
1785                 .rpc_cred       = cdata->cred,
1786         };
1787         int status;
1788
1789         dprintk("NFS call  commit %d @ %Ld\n", cdata->args.count,
1790                         (long long) cdata->args.offset);
1791
1792         cdata->args.bitmask = server->attr_bitmask;
1793         cdata->res.server = server;
1794         cdata->timestamp = jiffies;
1795         nfs_fattr_init(fattr);
1796         status = rpc_call_sync(server->client, &msg, 0);
1797         if (status >= 0)
1798                 renew_lease(server, cdata->timestamp);
1799         dprintk("NFS reply commit: %d\n", status);
1800         if (status >= 0)
1801                 nfs_post_op_update_inode(inode, fattr);
1802         return status;
1803 }
1804
1805 static int nfs4_proc_commit(struct nfs_write_data *cdata)
1806 {
1807         struct nfs4_exception exception = { };
1808         int err;
1809         do {
1810                 err = nfs4_handle_exception(NFS_SERVER(cdata->inode),
1811                                 _nfs4_proc_commit(cdata),
1812                                 &exception);
1813         } while (exception.retry);
1814         return err;
1815 }
1816
1817 /*
1818  * Got race?
1819  * We will need to arrange for the VFS layer to provide an atomic open.
1820  * Until then, this create/open method is prone to inefficiency and race
1821  * conditions due to the lookup, create, and open VFS calls from sys_open()
1822  * placed on the wire.
1823  *
1824  * Given the above sorry state of affairs, I'm simply sending an OPEN.
1825  * The file will be opened again in the subsequent VFS open call
1826  * (nfs4_proc_file_open).
1827  *
1828  * The open for read will just hang around to be used by any process that
1829  * opens the file O_RDONLY. This will all be resolved with the VFS changes.
1830  */
1831
1832 static int
1833 nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
1834                  int flags, struct nameidata *nd)
1835 {
1836         struct nfs4_state *state;
1837         struct rpc_cred *cred;
1838         int status = 0;
1839
1840         cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0);
1841         if (IS_ERR(cred)) {
1842                 status = PTR_ERR(cred);
1843                 goto out;
1844         }
1845         state = nfs4_do_open(dir, dentry, flags, sattr, cred);
1846         put_rpccred(cred);
1847         if (IS_ERR(state)) {
1848                 status = PTR_ERR(state);
1849                 goto out;
1850         }
1851         d_instantiate(dentry, igrab(state->inode));
1852         if (flags & O_EXCL) {
1853                 struct nfs_fattr fattr;
1854                 status = nfs4_do_setattr(state->inode, &fattr, sattr, state);
1855                 if (status == 0)
1856                         nfs_setattr_update_inode(state->inode, sattr);
1857         }
1858         if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN))
1859                 status = nfs4_intent_set_file(nd, dentry, state);
1860         else
1861                 nfs4_close_state(state, flags);
1862 out:
1863         return status;
1864 }
1865
1866 static int _nfs4_proc_remove(struct inode *dir, struct qstr *name)
1867 {
1868         struct nfs_server *server = NFS_SERVER(dir);
1869         struct nfs4_remove_arg args = {
1870                 .fh = NFS_FH(dir),
1871                 .name = name,
1872                 .bitmask = server->attr_bitmask,
1873         };
1874         struct nfs_fattr dir_attr;
1875         struct nfs4_remove_res  res = {
1876                 .server = server,
1877                 .dir_attr = &dir_attr,
1878         };
1879         struct rpc_message msg = {
1880                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
1881                 .rpc_argp       = &args,
1882                 .rpc_resp       = &res,
1883         };
1884         int                     status;
1885
1886         nfs_fattr_init(res.dir_attr);
1887         status = rpc_call_sync(server->client, &msg, 0);
1888         if (status == 0) {
1889                 update_changeattr(dir, &res.cinfo);
1890                 nfs_post_op_update_inode(dir, res.dir_attr);
1891         }
1892         return status;
1893 }
1894
1895 static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
1896 {
1897         struct nfs4_exception exception = { };
1898         int err;
1899         do {
1900                 err = nfs4_handle_exception(NFS_SERVER(dir),
1901                                 _nfs4_proc_remove(dir, name),
1902                                 &exception);
1903         } while (exception.retry);
1904         return err;
1905 }
1906
1907 struct unlink_desc {
1908         struct nfs4_remove_arg  args;
1909         struct nfs4_remove_res  res;
1910         struct nfs_fattr dir_attr;
1911 };
1912
1913 static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
1914                 struct qstr *name)
1915 {
1916         struct nfs_server *server = NFS_SERVER(dir->d_inode);
1917         struct unlink_desc *up;
1918
1919         up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL);
1920         if (!up)
1921                 return -ENOMEM;
1922
1923         up->args.fh = NFS_FH(dir->d_inode);
1924         up->args.name = name;
1925         up->args.bitmask = server->attr_bitmask;
1926         up->res.server = server;
1927         up->res.dir_attr = &up->dir_attr;
1928
1929         msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
1930         msg->rpc_argp = &up->args;
1931         msg->rpc_resp = &up->res;
1932         return 0;
1933 }
1934
1935 static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
1936 {
1937         struct rpc_message *msg = &task->tk_msg;
1938         struct unlink_desc *up;
1939
1940         if (msg->rpc_resp != NULL) {
1941                 up = container_of(msg->rpc_resp, struct unlink_desc, res);
1942                 update_changeattr(dir->d_inode, &up->res.cinfo);
1943                 nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr);
1944                 kfree(up);
1945                 msg->rpc_resp = NULL;
1946                 msg->rpc_argp = NULL;
1947         }
1948         return 0;
1949 }
1950
1951 static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1952                 struct inode *new_dir, struct qstr *new_name)
1953 {
1954         struct nfs_server *server = NFS_SERVER(old_dir);
1955         struct nfs4_rename_arg arg = {
1956                 .old_dir = NFS_FH(old_dir),
1957                 .new_dir = NFS_FH(new_dir),
1958                 .old_name = old_name,
1959                 .new_name = new_name,
1960                 .bitmask = server->attr_bitmask,
1961         };
1962         struct nfs_fattr old_fattr, new_fattr;
1963         struct nfs4_rename_res res = {
1964                 .server = server,
1965                 .old_fattr = &old_fattr,
1966                 .new_fattr = &new_fattr,
1967         };
1968         struct rpc_message msg = {
1969                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME],
1970                 .rpc_argp = &arg,
1971                 .rpc_resp = &res,
1972         };
1973         int                     status;
1974
1975         nfs_fattr_init(res.old_fattr);
1976         nfs_fattr_init(res.new_fattr);
1977         status = rpc_call_sync(server->client, &msg, 0);
1978
1979         if (!status) {
1980                 update_changeattr(old_dir, &res.old_cinfo);
1981                 nfs_post_op_update_inode(old_dir, res.old_fattr);
1982                 update_changeattr(new_dir, &res.new_cinfo);
1983                 nfs_post_op_update_inode(new_dir, res.new_fattr);
1984         }
1985         return status;
1986 }
1987
1988 static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
1989                 struct inode *new_dir, struct qstr *new_name)
1990 {
1991         struct nfs4_exception exception = { };
1992         int err;
1993         do {
1994                 err = nfs4_handle_exception(NFS_SERVER(old_dir),
1995                                 _nfs4_proc_rename(old_dir, old_name,
1996                                         new_dir, new_name),
1997                                 &exception);
1998         } while (exception.retry);
1999         return err;
2000 }
2001
2002 static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2003 {
2004         struct nfs_server *server = NFS_SERVER(inode);
2005         struct nfs4_link_arg arg = {
2006                 .fh     = NFS_FH(inode),
2007                 .dir_fh = NFS_FH(dir),
2008                 .name   = name,
2009                 .bitmask = server->attr_bitmask,
2010         };
2011         struct nfs_fattr fattr, dir_attr;
2012         struct nfs4_link_res res = {
2013                 .server = server,
2014                 .fattr = &fattr,
2015                 .dir_attr = &dir_attr,
2016         };
2017         struct rpc_message msg = {
2018                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
2019                 .rpc_argp = &arg,
2020                 .rpc_resp = &res,
2021         };
2022         int                     status;
2023
2024         nfs_fattr_init(res.fattr);
2025         nfs_fattr_init(res.dir_attr);
2026         status = rpc_call_sync(server->client, &msg, 0);
2027         if (!status) {
2028                 update_changeattr(dir, &res.cinfo);
2029                 nfs_post_op_update_inode(dir, res.dir_attr);
2030                 nfs_post_op_update_inode(inode, res.fattr);
2031         }
2032
2033         return status;
2034 }
2035
2036 static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name)
2037 {
2038         struct nfs4_exception exception = { };
2039         int err;
2040         do {
2041                 err = nfs4_handle_exception(NFS_SERVER(inode),
2042                                 _nfs4_proc_link(inode, dir, name),
2043                                 &exception);
2044         } while (exception.retry);
2045         return err;
2046 }
2047
2048 static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2049                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2050                 struct nfs_fattr *fattr)
2051 {
2052         struct nfs_server *server = NFS_SERVER(dir);
2053         struct nfs_fattr dir_fattr;
2054         struct nfs4_create_arg arg = {
2055                 .dir_fh = NFS_FH(dir),
2056                 .server = server,
2057                 .name = name,
2058                 .attrs = sattr,
2059                 .ftype = NF4LNK,
2060                 .bitmask = server->attr_bitmask,
2061         };
2062         struct nfs4_create_res res = {
2063                 .server = server,
2064                 .fh = fhandle,
2065                 .fattr = fattr,
2066                 .dir_fattr = &dir_fattr,
2067         };
2068         struct rpc_message msg = {
2069                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK],
2070                 .rpc_argp = &arg,
2071                 .rpc_resp = &res,
2072         };
2073         int                     status;
2074
2075         if (path->len > NFS4_MAXPATHLEN)
2076                 return -ENAMETOOLONG;
2077         arg.u.symlink = path;
2078         nfs_fattr_init(fattr);
2079         nfs_fattr_init(&dir_fattr);
2080
2081         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2082         if (!status)
2083                 update_changeattr(dir, &res.dir_cinfo);
2084         nfs_post_op_update_inode(dir, res.dir_fattr);
2085         return status;
2086 }
2087
2088 static int nfs4_proc_symlink(struct inode *dir, struct qstr *name,
2089                 struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle,
2090                 struct nfs_fattr *fattr)
2091 {
2092         struct nfs4_exception exception = { };
2093         int err;
2094         do {
2095                 err = nfs4_handle_exception(NFS_SERVER(dir),
2096                                 _nfs4_proc_symlink(dir, name, path, sattr,
2097                                         fhandle, fattr),
2098                                 &exception);
2099         } while (exception.retry);
2100         return err;
2101 }
2102
2103 static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2104                 struct iattr *sattr)
2105 {
2106         struct nfs_server *server = NFS_SERVER(dir);
2107         struct nfs_fh fhandle;
2108         struct nfs_fattr fattr, dir_fattr;
2109         struct nfs4_create_arg arg = {
2110                 .dir_fh = NFS_FH(dir),
2111                 .server = server,
2112                 .name = &dentry->d_name,
2113                 .attrs = sattr,
2114                 .ftype = NF4DIR,
2115                 .bitmask = server->attr_bitmask,
2116         };
2117         struct nfs4_create_res res = {
2118                 .server = server,
2119                 .fh = &fhandle,
2120                 .fattr = &fattr,
2121                 .dir_fattr = &dir_fattr,
2122         };
2123         struct rpc_message msg = {
2124                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2125                 .rpc_argp = &arg,
2126                 .rpc_resp = &res,
2127         };
2128         int                     status;
2129
2130         nfs_fattr_init(&fattr);
2131         nfs_fattr_init(&dir_fattr);
2132
2133         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2134         if (!status) {
2135                 update_changeattr(dir, &res.dir_cinfo);
2136                 nfs_post_op_update_inode(dir, res.dir_fattr);
2137                 status = nfs_instantiate(dentry, &fhandle, &fattr);
2138         }
2139         return status;
2140 }
2141
2142 static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
2143                 struct iattr *sattr)
2144 {
2145         struct nfs4_exception exception = { };
2146         int err;
2147         do {
2148                 err = nfs4_handle_exception(NFS_SERVER(dir),
2149                                 _nfs4_proc_mkdir(dir, dentry, sattr),
2150                                 &exception);
2151         } while (exception.retry);
2152         return err;
2153 }
2154
2155 static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2156                   u64 cookie, struct page *page, unsigned int count, int plus)
2157 {
2158         struct inode            *dir = dentry->d_inode;
2159         struct nfs4_readdir_arg args = {
2160                 .fh = NFS_FH(dir),
2161                 .pages = &page,
2162                 .pgbase = 0,
2163                 .count = count,
2164                 .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask,
2165         };
2166         struct nfs4_readdir_res res;
2167         struct rpc_message msg = {
2168                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
2169                 .rpc_argp = &args,
2170                 .rpc_resp = &res,
2171                 .rpc_cred = cred,
2172         };
2173         int                     status;
2174
2175         dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__,
2176                         dentry->d_parent->d_name.name,
2177                         dentry->d_name.name,
2178                         (unsigned long long)cookie);
2179         lock_kernel();
2180         nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args);
2181         res.pgbase = args.pgbase;
2182         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2183         if (status == 0)
2184                 memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE);
2185         unlock_kernel();
2186         dprintk("%s: returns %d\n", __FUNCTION__, status);
2187         return status;
2188 }
2189
2190 static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
2191                   u64 cookie, struct page *page, unsigned int count, int plus)
2192 {
2193         struct nfs4_exception exception = { };
2194         int err;
2195         do {
2196                 err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
2197                                 _nfs4_proc_readdir(dentry, cred, cookie,
2198                                         page, count, plus),
2199                                 &exception);
2200         } while (exception.retry);
2201         return err;
2202 }
2203
2204 static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2205                 struct iattr *sattr, dev_t rdev)
2206 {
2207         struct nfs_server *server = NFS_SERVER(dir);
2208         struct nfs_fh fh;
2209         struct nfs_fattr fattr, dir_fattr;
2210         struct nfs4_create_arg arg = {
2211                 .dir_fh = NFS_FH(dir),
2212                 .server = server,
2213                 .name = &dentry->d_name,
2214                 .attrs = sattr,
2215                 .bitmask = server->attr_bitmask,
2216         };
2217         struct nfs4_create_res res = {
2218                 .server = server,
2219                 .fh = &fh,
2220                 .fattr = &fattr,
2221                 .dir_fattr = &dir_fattr,
2222         };
2223         struct rpc_message msg = {
2224                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE],
2225                 .rpc_argp = &arg,
2226                 .rpc_resp = &res,
2227         };
2228         int                     status;
2229         int                     mode = sattr->ia_mode;
2230
2231         nfs_fattr_init(&fattr);
2232         nfs_fattr_init(&dir_fattr);
2233
2234         BUG_ON(!(sattr->ia_valid & ATTR_MODE));
2235         BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode));
2236         if (S_ISFIFO(mode))
2237                 arg.ftype = NF4FIFO;
2238         else if (S_ISBLK(mode)) {
2239                 arg.ftype = NF4BLK;
2240                 arg.u.device.specdata1 = MAJOR(rdev);
2241                 arg.u.device.specdata2 = MINOR(rdev);
2242         }
2243         else if (S_ISCHR(mode)) {
2244                 arg.ftype = NF4CHR;
2245                 arg.u.device.specdata1 = MAJOR(rdev);
2246                 arg.u.device.specdata2 = MINOR(rdev);
2247         }
2248         else
2249                 arg.ftype = NF4SOCK;
2250
2251         status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
2252         if (status == 0) {
2253                 update_changeattr(dir, &res.dir_cinfo);
2254                 nfs_post_op_update_inode(dir, res.dir_fattr);
2255                 status = nfs_instantiate(dentry, &fh, &fattr);
2256         }
2257         return status;
2258 }
2259
2260 static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
2261                 struct iattr *sattr, dev_t rdev)
2262 {
2263         struct nfs4_exception exception = { };
2264         int err;
2265         do {
2266                 err = nfs4_handle_exception(NFS_SERVER(dir),
2267                                 _nfs4_proc_mknod(dir, dentry, sattr, rdev),
2268                                 &exception);
2269         } while (exception.retry);
2270         return err;
2271 }
2272
2273 static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
2274                  struct nfs_fsstat *fsstat)
2275 {
2276         struct nfs4_statfs_arg args = {
2277                 .fh = fhandle,
2278                 .bitmask = server->attr_bitmask,
2279         };
2280         struct rpc_message msg = {
2281                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
2282                 .rpc_argp = &args,
2283                 .rpc_resp = fsstat,
2284         };
2285
2286         nfs_fattr_init(fsstat->fattr);
2287         return rpc_call_sync(server->client, &msg, 0);
2288 }
2289
2290 static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
2291 {
2292         struct nfs4_exception exception = { };
2293         int err;
2294         do {
2295                 err = nfs4_handle_exception(server,
2296                                 _nfs4_proc_statfs(server, fhandle, fsstat),
2297                                 &exception);
2298         } while (exception.retry);
2299         return err;
2300 }
2301
2302 static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
2303                 struct nfs_fsinfo *fsinfo)
2304 {
2305         struct nfs4_fsinfo_arg args = {
2306                 .fh = fhandle,
2307                 .bitmask = server->attr_bitmask,
2308         };
2309         struct rpc_message msg = {
2310                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
2311                 .rpc_argp = &args,
2312                 .rpc_resp = fsinfo,
2313         };
2314
2315         return rpc_call_sync(server->client, &msg, 0);
2316 }
2317
2318 static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2319 {
2320         struct nfs4_exception exception = { };
2321         int err;
2322
2323         do {
2324                 err = nfs4_handle_exception(server,
2325                                 _nfs4_do_fsinfo(server, fhandle, fsinfo),
2326                                 &exception);
2327         } while (exception.retry);
2328         return err;
2329 }
2330
2331 static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
2332 {
2333         nfs_fattr_init(fsinfo->fattr);
2334         return nfs4_do_fsinfo(server, fhandle, fsinfo);
2335 }
2336
2337 static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2338                 struct nfs_pathconf *pathconf)
2339 {
2340         struct nfs4_pathconf_arg args = {
2341                 .fh = fhandle,
2342                 .bitmask = server->attr_bitmask,
2343         };
2344         struct rpc_message msg = {
2345                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
2346                 .rpc_argp = &args,
2347                 .rpc_resp = pathconf,
2348         };
2349
2350         /* None of the pathconf attributes are mandatory to implement */
2351         if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
2352                 memset(pathconf, 0, sizeof(*pathconf));
2353                 return 0;
2354         }
2355
2356         nfs_fattr_init(pathconf->fattr);
2357         return rpc_call_sync(server->client, &msg, 0);
2358 }
2359
2360 static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
2361                 struct nfs_pathconf *pathconf)
2362 {
2363         struct nfs4_exception exception = { };
2364         int err;
2365
2366         do {
2367                 err = nfs4_handle_exception(server,
2368                                 _nfs4_proc_pathconf(server, fhandle, pathconf),
2369                                 &exception);
2370         } while (exception.retry);
2371         return err;
2372 }
2373
2374 static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
2375 {
2376         struct nfs_server *server = NFS_SERVER(data->inode);
2377
2378         if (nfs4_async_handle_error(task, server) == -EAGAIN) {
2379                 rpc_restart_call(task);
2380                 return -EAGAIN;
2381         }
2382         if (task->tk_status > 0)
2383                 renew_lease(server, data->timestamp);
2384         return 0;
2385 }
2386
2387 static void nfs4_proc_read_setup(struct nfs_read_data *data)
2388 {
2389         struct rpc_message msg = {
2390                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
2391                 .rpc_argp = &data->args,
2392                 .rpc_resp = &data->res,
2393                 .rpc_cred = data->cred,
2394         };
2395
2396         data->timestamp   = jiffies;
2397
2398         rpc_call_setup(&data->task, &msg, 0);
2399 }
2400
2401 static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
2402 {
2403         struct inode *inode = data->inode;
2404
2405         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2406                 rpc_restart_call(task);
2407                 return -EAGAIN;
2408         }
2409         if (task->tk_status >= 0) {
2410                 renew_lease(NFS_SERVER(inode), data->timestamp);
2411                 nfs_post_op_update_inode(inode, data->res.fattr);
2412         }
2413         return 0;
2414 }
2415
2416 static void nfs4_proc_write_setup(struct nfs_write_data *data, int how)
2417 {
2418         struct rpc_message msg = {
2419                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE],
2420                 .rpc_argp = &data->args,
2421                 .rpc_resp = &data->res,
2422                 .rpc_cred = data->cred,
2423         };
2424         struct inode *inode = data->inode;
2425         struct nfs_server *server = NFS_SERVER(inode);
2426         int stable;
2427
2428         if (how & FLUSH_STABLE) {
2429                 if (!NFS_I(inode)->ncommit)
2430                         stable = NFS_FILE_SYNC;
2431                 else
2432                         stable = NFS_DATA_SYNC;
2433         } else
2434                 stable = NFS_UNSTABLE;
2435         data->args.stable = stable;
2436         data->args.bitmask = server->attr_bitmask;
2437         data->res.server = server;
2438
2439         data->timestamp   = jiffies;
2440
2441         /* Finalize the task. */
2442         rpc_call_setup(&data->task, &msg, 0);
2443 }
2444
2445 static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data)
2446 {
2447         struct inode *inode = data->inode;
2448
2449         if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
2450                 rpc_restart_call(task);
2451                 return -EAGAIN;
2452         }
2453         if (task->tk_status >= 0)
2454                 nfs_post_op_update_inode(inode, data->res.fattr);
2455         return 0;
2456 }
2457
2458 static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how)
2459 {
2460         struct rpc_message msg = {
2461                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
2462                 .rpc_argp = &data->args,
2463                 .rpc_resp = &data->res,
2464                 .rpc_cred = data->cred,
2465         };
2466         struct nfs_server *server = NFS_SERVER(data->inode);
2467
2468         data->args.bitmask = server->attr_bitmask;
2469         data->res.server = server;
2470
2471         rpc_call_setup(&data->task, &msg, 0);
2472 }
2473
2474 /*
2475  * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
2476  * standalone procedure for queueing an asynchronous RENEW.
2477  */
2478 static void nfs4_renew_done(struct rpc_task *task, void *data)
2479 {
2480         struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp;
2481         unsigned long timestamp = (unsigned long)data;
2482
2483         if (task->tk_status < 0) {
2484                 switch (task->tk_status) {
2485                         case -NFS4ERR_STALE_CLIENTID:
2486                         case -NFS4ERR_EXPIRED:
2487                         case -NFS4ERR_CB_PATH_DOWN:
2488                                 nfs4_schedule_state_recovery(clp);
2489                 }
2490                 return;
2491         }
2492         spin_lock(&clp->cl_lock);
2493         if (time_before(clp->cl_last_renewal,timestamp))
2494                 clp->cl_last_renewal = timestamp;
2495         spin_unlock(&clp->cl_lock);
2496 }
2497
2498 static const struct rpc_call_ops nfs4_renew_ops = {
2499         .rpc_call_done = nfs4_renew_done,
2500 };
2501
2502 int nfs4_proc_async_renew(struct nfs4_client *clp, struct rpc_cred *cred)
2503 {
2504         struct rpc_message msg = {
2505                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2506                 .rpc_argp       = clp,
2507                 .rpc_cred       = cred,
2508         };
2509
2510         return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT,
2511                         &nfs4_renew_ops, (void *)jiffies);
2512 }
2513
2514 int nfs4_proc_renew(struct nfs4_client *clp, struct rpc_cred *cred)
2515 {
2516         struct rpc_message msg = {
2517                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_RENEW],
2518                 .rpc_argp       = clp,
2519                 .rpc_cred       = cred,
2520         };
2521         unsigned long now = jiffies;
2522         int status;
2523
2524         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2525         if (status < 0)
2526                 return status;
2527         spin_lock(&clp->cl_lock);
2528         if (time_before(clp->cl_last_renewal,now))
2529                 clp->cl_last_renewal = now;
2530         spin_unlock(&clp->cl_lock);
2531         return 0;
2532 }
2533
2534 static inline int nfs4_server_supports_acls(struct nfs_server *server)
2535 {
2536         return (server->caps & NFS_CAP_ACLS)
2537                 && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
2538                 && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL);
2539 }
2540
2541 /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that
2542  * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on
2543  * the stack.
2544  */
2545 #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT)
2546
2547 static void buf_to_pages(const void *buf, size_t buflen,
2548                 struct page **pages, unsigned int *pgbase)
2549 {
2550         const void *p = buf;
2551
2552         *pgbase = offset_in_page(buf);
2553         p -= *pgbase;
2554         while (p < buf + buflen) {
2555                 *(pages++) = virt_to_page(p);
2556                 p += PAGE_CACHE_SIZE;
2557         }
2558 }
2559
2560 struct nfs4_cached_acl {
2561         int cached;
2562         size_t len;
2563         char data[0];
2564 };
2565
2566 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
2567 {
2568         struct nfs_inode *nfsi = NFS_I(inode);
2569
2570         spin_lock(&inode->i_lock);
2571         kfree(nfsi->nfs4_acl);
2572         nfsi->nfs4_acl = acl;
2573         spin_unlock(&inode->i_lock);
2574 }
2575
2576 static void nfs4_zap_acl_attr(struct inode *inode)
2577 {
2578         nfs4_set_cached_acl(inode, NULL);
2579 }
2580
2581 static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
2582 {
2583         struct nfs_inode *nfsi = NFS_I(inode);
2584         struct nfs4_cached_acl *acl;
2585         int ret = -ENOENT;
2586
2587         spin_lock(&inode->i_lock);
2588         acl = nfsi->nfs4_acl;
2589         if (acl == NULL)
2590                 goto out;
2591         if (buf == NULL) /* user is just asking for length */
2592                 goto out_len;
2593         if (acl->cached == 0)
2594                 goto out;
2595         ret = -ERANGE; /* see getxattr(2) man page */
2596         if (acl->len > buflen)
2597                 goto out;
2598         memcpy(buf, acl->data, acl->len);
2599 out_len:
2600         ret = acl->len;
2601 out:
2602         spin_unlock(&inode->i_lock);
2603         return ret;
2604 }
2605
2606 static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len)
2607 {
2608         struct nfs4_cached_acl *acl;
2609
2610         if (buf && acl_len <= PAGE_SIZE) {
2611                 acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
2612                 if (acl == NULL)
2613                         goto out;
2614                 acl->cached = 1;
2615                 memcpy(acl->data, buf, acl_len);
2616         } else {
2617                 acl = kmalloc(sizeof(*acl), GFP_KERNEL);
2618                 if (acl == NULL)
2619                         goto out;
2620                 acl->cached = 0;
2621         }
2622         acl->len = acl_len;
2623 out:
2624         nfs4_set_cached_acl(inode, acl);
2625 }
2626
2627 static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
2628 {
2629         struct page *pages[NFS4ACL_MAXPAGES];
2630         struct nfs_getaclargs args = {
2631                 .fh = NFS_FH(inode),
2632                 .acl_pages = pages,
2633                 .acl_len = buflen,
2634         };
2635         size_t resp_len = buflen;
2636         void *resp_buf;
2637         struct rpc_message msg = {
2638                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
2639                 .rpc_argp = &args,
2640                 .rpc_resp = &resp_len,
2641         };
2642         struct page *localpage = NULL;
2643         int ret;
2644
2645         if (buflen < PAGE_SIZE) {
2646                 /* As long as we're doing a round trip to the server anyway,
2647                  * let's be prepared for a page of acl data. */
2648                 localpage = alloc_page(GFP_KERNEL);
2649                 resp_buf = page_address(localpage);
2650                 if (localpage == NULL)
2651                         return -ENOMEM;
2652                 args.acl_pages[0] = localpage;
2653                 args.acl_pgbase = 0;
2654                 resp_len = args.acl_len = PAGE_SIZE;
2655         } else {
2656                 resp_buf = buf;
2657                 buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase);
2658         }
2659         ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0);
2660         if (ret)
2661                 goto out_free;
2662         if (resp_len > args.acl_len)
2663                 nfs4_write_cached_acl(inode, NULL, resp_len);
2664         else
2665                 nfs4_write_cached_acl(inode, resp_buf, resp_len);
2666         if (buf) {
2667                 ret = -ERANGE;
2668                 if (resp_len > buflen)
2669                         goto out_free;
2670                 if (localpage)
2671                         memcpy(buf, resp_buf, resp_len);
2672         }
2673         ret = resp_len;
2674 out_free:
2675         if (localpage)
2676                 __free_page(localpage);
2677         return ret;
2678 }
2679
2680 static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
2681 {
2682         struct nfs_server *server = NFS_SERVER(inode);
2683         int ret;
2684
2685         if (!nfs4_server_supports_acls(server))
2686                 return -EOPNOTSUPP;
2687         ret = nfs_revalidate_inode(server, inode);
2688         if (ret < 0)
2689                 return ret;
2690         ret = nfs4_read_cached_acl(inode, buf, buflen);
2691         if (ret != -ENOENT)
2692                 return ret;
2693         return nfs4_get_acl_uncached(inode, buf, buflen);
2694 }
2695
2696 static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
2697 {
2698         struct nfs_server *server = NFS_SERVER(inode);
2699         struct page *pages[NFS4ACL_MAXPAGES];
2700         struct nfs_setaclargs arg = {
2701                 .fh             = NFS_FH(inode),
2702                 .acl_pages      = pages,
2703                 .acl_len        = buflen,
2704         };
2705         struct rpc_message msg = {
2706                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_SETACL],
2707                 .rpc_argp       = &arg,
2708                 .rpc_resp       = NULL,
2709         };
2710         int ret;
2711
2712         if (!nfs4_server_supports_acls(server))
2713                 return -EOPNOTSUPP;
2714         nfs_inode_return_delegation(inode);
2715         buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
2716         ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0);
2717         if (ret == 0)
2718                 nfs4_write_cached_acl(inode, buf, buflen);
2719         return ret;
2720 }
2721
2722 static int
2723 nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server)
2724 {
2725         struct nfs4_client *clp = server->nfs4_state;
2726
2727         if (!clp || task->tk_status >= 0)
2728                 return 0;
2729         switch(task->tk_status) {
2730                 case -NFS4ERR_STALE_CLIENTID:
2731                 case -NFS4ERR_STALE_STATEID:
2732                 case -NFS4ERR_EXPIRED:
2733                         rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL);
2734                         nfs4_schedule_state_recovery(clp);
2735                         if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0)
2736                                 rpc_wake_up_task(task);
2737                         task->tk_status = 0;
2738                         return -EAGAIN;
2739                 case -NFS4ERR_DELAY:
2740                         nfs_inc_server_stats((struct nfs_server *) server,
2741                                                 NFSIOS_DELAY);
2742                 case -NFS4ERR_GRACE:
2743                         rpc_delay(task, NFS4_POLL_RETRY_MAX);
2744                         task->tk_status = 0;
2745                         return -EAGAIN;
2746                 case -NFS4ERR_OLD_STATEID:
2747                         task->tk_status = 0;
2748                         return -EAGAIN;
2749         }
2750         task->tk_status = nfs4_map_errors(task->tk_status);
2751         return 0;
2752 }
2753
2754 static int nfs4_wait_bit_interruptible(void *word)
2755 {
2756         if (signal_pending(current))
2757                 return -ERESTARTSYS;
2758         schedule();
2759         return 0;
2760 }
2761
2762 static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp)
2763 {
2764         sigset_t oldset;
2765         int res;
2766
2767         might_sleep();
2768
2769         rpc_clnt_sigmask(clnt, &oldset);
2770         res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER,
2771                         nfs4_wait_bit_interruptible,
2772                         TASK_INTERRUPTIBLE);
2773         rpc_clnt_sigunmask(clnt, &oldset);
2774         return res;
2775 }
2776
2777 static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
2778 {
2779         sigset_t oldset;
2780         int res = 0;
2781
2782         might_sleep();
2783
2784         if (*timeout <= 0)
2785                 *timeout = NFS4_POLL_RETRY_MIN;
2786         if (*timeout > NFS4_POLL_RETRY_MAX)
2787                 *timeout = NFS4_POLL_RETRY_MAX;
2788         rpc_clnt_sigmask(clnt, &oldset);
2789         if (clnt->cl_intr) {
2790                 schedule_timeout_interruptible(*timeout);
2791                 if (signalled())
2792                         res = -ERESTARTSYS;
2793         } else
2794                 schedule_timeout_uninterruptible(*timeout);
2795         rpc_clnt_sigunmask(clnt, &oldset);
2796         *timeout <<= 1;
2797         return res;
2798 }
2799
2800 /* This is the error handling routine for processes that are allowed
2801  * to sleep.
2802  */
2803 int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
2804 {
2805         struct nfs4_client *clp = server->nfs4_state;
2806         int ret = errorcode;
2807
2808         exception->retry = 0;
2809         switch(errorcode) {
2810                 case 0:
2811                         return 0;
2812                 case -NFS4ERR_STALE_CLIENTID:
2813                 case -NFS4ERR_STALE_STATEID:
2814                 case -NFS4ERR_EXPIRED:
2815                         nfs4_schedule_state_recovery(clp);
2816                         ret = nfs4_wait_clnt_recover(server->client, clp);
2817                         if (ret == 0)
2818                                 exception->retry = 1;
2819                         break;
2820                 case -NFS4ERR_GRACE:
2821                 case -NFS4ERR_DELAY:
2822                         ret = nfs4_delay(server->client, &exception->timeout);
2823                         if (ret != 0)
2824                                 break;
2825                 case -NFS4ERR_OLD_STATEID:
2826                         exception->retry = 1;
2827         }
2828         /* We failed to handle the error */
2829         return nfs4_map_errors(ret);
2830 }
2831
2832 int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port, struct rpc_cred *cred)
2833 {
2834         nfs4_verifier sc_verifier;
2835         struct nfs4_setclientid setclientid = {
2836                 .sc_verifier = &sc_verifier,
2837                 .sc_prog = program,
2838         };
2839         struct rpc_message msg = {
2840                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
2841                 .rpc_argp = &setclientid,
2842                 .rpc_resp = clp,
2843                 .rpc_cred = cred,
2844         };
2845         u32 *p;
2846         int loop = 0;
2847         int status;
2848
2849         p = (u32*)sc_verifier.data;
2850         *p++ = htonl((u32)clp->cl_boot_time.tv_sec);
2851         *p = htonl((u32)clp->cl_boot_time.tv_nsec);
2852
2853         for(;;) {
2854                 setclientid.sc_name_len = scnprintf(setclientid.sc_name,
2855                                 sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u",
2856                                 clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr),
2857                                 cred->cr_ops->cr_name,
2858                                 clp->cl_id_uniquifier);
2859                 setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
2860                                 sizeof(setclientid.sc_netid), "tcp");
2861                 setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
2862                                 sizeof(setclientid.sc_uaddr), "%s.%d.%d",
2863                                 clp->cl_ipaddr, port >> 8, port & 255);
2864
2865                 status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2866                 if (status != -NFS4ERR_CLID_INUSE)
2867                         break;
2868                 if (signalled())
2869                         break;
2870                 if (loop++ & 1)
2871                         ssleep(clp->cl_lease_time + 1);
2872                 else
2873                         if (++clp->cl_id_uniquifier == 0)
2874                                 break;
2875         }
2876         return status;
2877 }
2878
2879 static int _nfs4_proc_setclientid_confirm(struct nfs4_client *clp, struct rpc_cred *cred)
2880 {
2881         struct nfs_fsinfo fsinfo;
2882         struct rpc_message msg = {
2883                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
2884                 .rpc_argp = clp,
2885                 .rpc_resp = &fsinfo,
2886                 .rpc_cred = cred,
2887         };
2888         unsigned long now;
2889         int status;
2890
2891         now = jiffies;
2892         status = rpc_call_sync(clp->cl_rpcclient, &msg, 0);
2893         if (status == 0) {
2894                 spin_lock(&clp->cl_lock);
2895                 clp->cl_lease_time = fsinfo.lease_time * HZ;
2896                 clp->cl_last_renewal = now;
2897                 clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
2898                 spin_unlock(&clp->cl_lock);
2899         }
2900         return status;
2901 }
2902
2903 int nfs4_proc_setclientid_confirm(struct nfs4_client *clp, struct rpc_cred *cred)
2904 {
2905         long timeout;
2906         int err;
2907         do {
2908                 err = _nfs4_proc_setclientid_confirm(clp, cred);
2909                 switch (err) {
2910                         case 0:
2911                                 return err;
2912                         case -NFS4ERR_RESOURCE:
2913                                 /* The IBM lawyers misread another document! */
2914                         case -NFS4ERR_DELAY:
2915                                 err = nfs4_delay(clp->cl_rpcclient, &timeout);
2916                 }
2917         } while (err == 0);
2918         return err;
2919 }
2920
2921 struct nfs4_delegreturndata {
2922         struct nfs4_delegreturnargs args;
2923         struct nfs4_delegreturnres res;
2924         struct nfs_fh fh;
2925         nfs4_stateid stateid;
2926         struct rpc_cred *cred;
2927         unsigned long timestamp;
2928         struct nfs_fattr fattr;
2929         int rpc_status;
2930 };
2931
2932 static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata)
2933 {
2934         struct nfs4_delegreturndata *data = calldata;
2935         struct rpc_message msg = {
2936                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
2937                 .rpc_argp = &data->args,
2938                 .rpc_resp = &data->res,
2939                 .rpc_cred = data->cred,
2940         };
2941         nfs_fattr_init(data->res.fattr);
2942         rpc_call_setup(task, &msg, 0);
2943 }
2944
2945 static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
2946 {
2947         struct nfs4_delegreturndata *data = calldata;
2948         data->rpc_status = task->tk_status;
2949         if (data->rpc_status == 0)
2950                 renew_lease(data->res.server, data->timestamp);
2951 }
2952
2953 static void nfs4_delegreturn_release(void *calldata)
2954 {
2955         struct nfs4_delegreturndata *data = calldata;
2956
2957         put_rpccred(data->cred);
2958         kfree(calldata);
2959 }
2960
2961 static const struct rpc_call_ops nfs4_delegreturn_ops = {
2962         .rpc_call_prepare = nfs4_delegreturn_prepare,
2963         .rpc_call_done = nfs4_delegreturn_done,
2964         .rpc_release = nfs4_delegreturn_release,
2965 };
2966
2967 static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
2968 {
2969         struct nfs4_delegreturndata *data;
2970         struct nfs_server *server = NFS_SERVER(inode);
2971         struct rpc_task *task;
2972         int status;
2973
2974         data = kmalloc(sizeof(*data), GFP_KERNEL);
2975         if (data == NULL)
2976                 return -ENOMEM;
2977         data->args.fhandle = &data->fh;
2978         data->args.stateid = &data->stateid;
2979         data->args.bitmask = server->attr_bitmask;
2980         nfs_copy_fh(&data->fh, NFS_FH(inode));
2981         memcpy(&data->stateid, stateid, sizeof(data->stateid));
2982         data->res.fattr = &data->fattr;
2983         data->res.server = server;
2984         data->cred = get_rpccred(cred);
2985         data->timestamp = jiffies;
2986         data->rpc_status = 0;
2987
2988         task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data);
2989         if (IS_ERR(task))
2990                 return PTR_ERR(task);
2991         status = nfs4_wait_for_completion_rpc_task(task);
2992         if (status == 0) {
2993                 status = data->rpc_status;
2994                 if (status == 0)
2995                         nfs_post_op_update_inode(inode, &data->fattr);
2996         }
2997         rpc_release_task(task);
2998         return status;
2999 }
3000
3001 int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid)
3002 {
3003         struct nfs_server *server = NFS_SERVER(inode);
3004         struct nfs4_exception exception = { };
3005         int err;
3006         do {
3007                 err = _nfs4_proc_delegreturn(inode, cred, stateid);
3008                 switch (err) {
3009                         case -NFS4ERR_STALE_STATEID:
3010                         case -NFS4ERR_EXPIRED:
3011                                 nfs4_schedule_state_recovery(server->nfs4_state);
3012                         case 0:
3013                                 return 0;
3014                 }
3015                 err = nfs4_handle_exception(server, err, &exception);
3016         } while (exception.retry);
3017         return err;
3018 }
3019
3020 #define NFS4_LOCK_MINTIMEOUT (1 * HZ)
3021 #define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
3022
3023 /*
3024  * sleep, with exponential backoff, and retry the LOCK operation.
3025  */
3026 static unsigned long
3027 nfs4_set_lock_task_retry(unsigned long timeout)
3028 {
3029         schedule_timeout_interruptible(timeout);
3030         timeout <<= 1;
3031         if (timeout > NFS4_LOCK_MAXTIMEOUT)
3032                 return NFS4_LOCK_MAXTIMEOUT;
3033         return timeout;
3034 }
3035
3036 static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3037 {
3038         struct inode *inode = state->inode;
3039         struct nfs_server *server = NFS_SERVER(inode);
3040         struct nfs4_client *clp = server->nfs4_state;
3041         struct nfs_lockt_args arg = {
3042                 .fh = NFS_FH(inode),
3043                 .fl = request,
3044         };
3045         struct nfs_lockt_res res = {
3046                 .denied = request,
3047         };
3048         struct rpc_message msg = {
3049                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
3050                 .rpc_argp       = &arg,
3051                 .rpc_resp       = &res,
3052                 .rpc_cred       = state->owner->so_cred,
3053         };
3054         struct nfs4_lock_state *lsp;
3055         int status;
3056
3057         down_read(&clp->cl_sem);
3058         arg.lock_owner.clientid = clp->cl_clientid;
3059         status = nfs4_set_lock_state(state, request);
3060         if (status != 0)
3061                 goto out;
3062         lsp = request->fl_u.nfs4_fl.owner;
3063         arg.lock_owner.id = lsp->ls_id;
3064         status = rpc_call_sync(server->client, &msg, 0);
3065         switch (status) {
3066                 case 0:
3067                         request->fl_type = F_UNLCK;
3068                         break;
3069                 case -NFS4ERR_DENIED:
3070                         status = 0;
3071         }
3072 out:
3073         up_read(&clp->cl_sem);
3074         return status;
3075 }
3076
3077 static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3078 {
3079         struct nfs4_exception exception = { };
3080         int err;
3081
3082         do {
3083                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3084                                 _nfs4_proc_getlk(state, cmd, request),
3085                                 &exception);
3086         } while (exception.retry);
3087         return err;
3088 }
3089
3090 static int do_vfs_lock(struct file *file, struct file_lock *fl)
3091 {
3092         int res = 0;
3093         switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
3094                 case FL_POSIX:
3095                         res = posix_lock_file_wait(file, fl);
3096                         break;
3097                 case FL_FLOCK:
3098                         res = flock_lock_file_wait(file, fl);
3099                         break;
3100                 default:
3101                         BUG();
3102         }
3103         if (res < 0)
3104                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
3105                                 __FUNCTION__);
3106         return res;
3107 }
3108
3109 struct nfs4_unlockdata {
3110         struct nfs_locku_args arg;
3111         struct nfs_locku_res res;
3112         struct nfs4_lock_state *lsp;
3113         struct nfs_open_context *ctx;
3114         struct file_lock fl;
3115         const struct nfs_server *server;
3116         unsigned long timestamp;
3117 };
3118
3119 static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
3120                 struct nfs_open_context *ctx,
3121                 struct nfs4_lock_state *lsp,
3122                 struct nfs_seqid *seqid)
3123 {
3124         struct nfs4_unlockdata *p;
3125         struct inode *inode = lsp->ls_state->inode;
3126
3127         p = kmalloc(sizeof(*p), GFP_KERNEL);
3128         if (p == NULL)
3129                 return NULL;
3130         p->arg.fh = NFS_FH(inode);
3131         p->arg.fl = &p->fl;
3132         p->arg.seqid = seqid;
3133         p->arg.stateid = &lsp->ls_stateid;
3134         p->lsp = lsp;
3135         atomic_inc(&lsp->ls_count);
3136         /* Ensure we don't close file until we're done freeing locks! */
3137         p->ctx = get_nfs_open_context(ctx);
3138         memcpy(&p->fl, fl, sizeof(p->fl));
3139         p->server = NFS_SERVER(inode);
3140         return p;
3141 }
3142
3143 static void nfs4_locku_release_calldata(void *data)
3144 {
3145         struct nfs4_unlockdata *calldata = data;
3146         nfs_free_seqid(calldata->arg.seqid);
3147         nfs4_put_lock_state(calldata->lsp);
3148         put_nfs_open_context(calldata->ctx);
3149         kfree(calldata);
3150 }
3151
3152 static void nfs4_locku_done(struct rpc_task *task, void *data)
3153 {
3154         struct nfs4_unlockdata *calldata = data;
3155
3156         if (RPC_ASSASSINATED(task))
3157                 return;
3158         nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid);
3159         switch (task->tk_status) {
3160                 case 0:
3161                         memcpy(calldata->lsp->ls_stateid.data,
3162                                         calldata->res.stateid.data,
3163                                         sizeof(calldata->lsp->ls_stateid.data));
3164                         renew_lease(calldata->server, calldata->timestamp);
3165                         break;
3166                 case -NFS4ERR_STALE_STATEID:
3167                 case -NFS4ERR_EXPIRED:
3168                         nfs4_schedule_state_recovery(calldata->server->nfs4_state);
3169                         break;
3170                 default:
3171                         if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) {
3172                                 rpc_restart_call(task);
3173                         }
3174         }
3175 }
3176
3177 static void nfs4_locku_prepare(struct rpc_task *task, void *data)
3178 {
3179         struct nfs4_unlockdata *calldata = data;
3180         struct rpc_message msg = {
3181                 .rpc_proc       = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
3182                 .rpc_argp       = &calldata->arg,
3183                 .rpc_resp       = &calldata->res,
3184                 .rpc_cred       = calldata->lsp->ls_state->owner->so_cred,
3185         };
3186
3187         if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
3188                 return;
3189         if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) {
3190                 /* Note: exit _without_ running nfs4_locku_done */
3191                 task->tk_action = NULL;
3192                 return;
3193         }
3194         calldata->timestamp = jiffies;
3195         rpc_call_setup(task, &msg, 0);
3196 }
3197
3198 static const struct rpc_call_ops nfs4_locku_ops = {
3199         .rpc_call_prepare = nfs4_locku_prepare,
3200         .rpc_call_done = nfs4_locku_done,
3201         .rpc_release = nfs4_locku_release_calldata,
3202 };
3203
3204 static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
3205                 struct nfs_open_context *ctx,
3206                 struct nfs4_lock_state *lsp,
3207                 struct nfs_seqid *seqid)
3208 {
3209         struct nfs4_unlockdata *data;
3210
3211         data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
3212         if (data == NULL) {
3213                 nfs_free_seqid(seqid);
3214                 return ERR_PTR(-ENOMEM);
3215         }
3216
3217         /* Unlock _before_ we do the RPC call */
3218         do_vfs_lock(fl->fl_file, fl);
3219         return rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data);
3220 }
3221
3222 static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
3223 {
3224         struct nfs_seqid *seqid;
3225         struct nfs4_lock_state *lsp;
3226         struct rpc_task *task;
3227         int status = 0;
3228
3229         /* Is this a delegated lock? */
3230         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3231                 goto out_unlock;
3232         /* Is this open_owner holding any locks on the server? */
3233         if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
3234                 goto out_unlock;
3235
3236         status = nfs4_set_lock_state(state, request);
3237         if (status != 0)
3238                 goto out_unlock;
3239         lsp = request->fl_u.nfs4_fl.owner;
3240         status = -ENOMEM;
3241         seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3242         if (seqid == NULL)
3243                 goto out_unlock;
3244         task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid);
3245         status = PTR_ERR(task);
3246         if (IS_ERR(task))
3247                 goto out_unlock;
3248         status = nfs4_wait_for_completion_rpc_task(task);
3249         rpc_release_task(task);
3250         return status;
3251 out_unlock:
3252         do_vfs_lock(request->fl_file, request);
3253         return status;
3254 }
3255
3256 struct nfs4_lockdata {
3257         struct nfs_lock_args arg;
3258         struct nfs_lock_res res;
3259         struct nfs4_lock_state *lsp;
3260         struct nfs_open_context *ctx;
3261         struct file_lock fl;
3262         unsigned long timestamp;
3263         int rpc_status;
3264         int cancelled;
3265 };
3266
3267 static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
3268                 struct nfs_open_context *ctx, struct nfs4_lock_state *lsp)
3269 {
3270         struct nfs4_lockdata *p;
3271         struct inode *inode = lsp->ls_state->inode;
3272         struct nfs_server *server = NFS_SERVER(inode);
3273
3274         p = kzalloc(sizeof(*p), GFP_KERNEL);
3275         if (p == NULL)
3276                 return NULL;
3277
3278         p->arg.fh = NFS_FH(inode);
3279         p->arg.fl = &p->fl;
3280         p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
3281         if (p->arg.lock_seqid == NULL)
3282                 goto out_free;
3283         p->arg.lock_stateid = &lsp->ls_stateid;
3284         p->arg.lock_owner.clientid = server->nfs4_state->cl_clientid;
3285         p->arg.lock_owner.id = lsp->ls_id;
3286         p->lsp = lsp;
3287         atomic_inc(&lsp->ls_count);
3288         p->ctx = get_nfs_open_context(ctx);
3289         memcpy(&p->fl, fl, sizeof(p->fl));
3290         return p;
3291 out_free:
3292         kfree(p);
3293         return NULL;
3294 }
3295
3296 static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
3297 {
3298         struct nfs4_lockdata *data = calldata;
3299         struct nfs4_state *state = data->lsp->ls_state;
3300         struct nfs4_state_owner *sp = state->owner;
3301         struct rpc_message msg = {
3302                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
3303                 .rpc_argp = &data->arg,
3304                 .rpc_resp = &data->res,
3305                 .rpc_cred = sp->so_cred,
3306         };
3307
3308         if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
3309                 return;
3310         dprintk("%s: begin!\n", __FUNCTION__);
3311         /* Do we need to do an open_to_lock_owner? */
3312         if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
3313                 data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
3314                 if (data->arg.open_seqid == NULL) {
3315                         data->rpc_status = -ENOMEM;
3316                         task->tk_action = NULL;
3317                         goto out;
3318                 }
3319                 data->arg.open_stateid = &state->stateid;
3320                 data->arg.new_lock_owner = 1;
3321         }
3322         data->timestamp = jiffies;
3323         rpc_call_setup(task, &msg, 0);
3324 out:
3325         dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
3326 }
3327
3328 static void nfs4_lock_done(struct rpc_task *task, void *calldata)
3329 {
3330         struct nfs4_lockdata *data = calldata;
3331
3332         dprintk("%s: begin!\n", __FUNCTION__);
3333
3334         data->rpc_status = task->tk_status;
3335         if (RPC_ASSASSINATED(task))
3336                 goto out;
3337         if (data->arg.new_lock_owner != 0) {
3338                 nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid);
3339                 if (data->rpc_status == 0)
3340                         nfs_confirm_seqid(&data->lsp->ls_seqid, 0);
3341                 else
3342                         goto out;
3343         }
3344         if (data->rpc_status == 0) {
3345                 memcpy(data->lsp->ls_stateid.data, data->res.stateid.data,
3346                                         sizeof(data->lsp->ls_stateid.data));
3347                 data->lsp->ls_flags |= NFS_LOCK_INITIALIZED;
3348                 renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp);
3349         }
3350         nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid);
3351 out:
3352         dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status);
3353 }
3354
3355 static void nfs4_lock_release(void *calldata)
3356 {
3357         struct nfs4_lockdata *data = calldata;
3358
3359         dprintk("%s: begin!\n", __FUNCTION__);
3360         if (data->arg.open_seqid != NULL)
3361                 nfs_free_seqid(data->arg.open_seqid);
3362         if (data->cancelled != 0) {
3363                 struct rpc_task *task;
3364                 task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
3365                                 data->arg.lock_seqid);
3366                 if (!IS_ERR(task))
3367                         rpc_release_task(task);
3368                 dprintk("%s: cancelling lock!\n", __FUNCTION__);
3369         } else
3370                 nfs_free_seqid(data->arg.lock_seqid);
3371         nfs4_put_lock_state(data->lsp);
3372         put_nfs_open_context(data->ctx);
3373         kfree(data);
3374         dprintk("%s: done!\n", __FUNCTION__);
3375 }
3376
3377 static const struct rpc_call_ops nfs4_lock_ops = {
3378         .rpc_call_prepare = nfs4_lock_prepare,
3379         .rpc_call_done = nfs4_lock_done,
3380         .rpc_release = nfs4_lock_release,
3381 };
3382
3383 static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim)
3384 {
3385         struct nfs4_lockdata *data;
3386         struct rpc_task *task;
3387         int ret;
3388
3389         dprintk("%s: begin!\n", __FUNCTION__);
3390         data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data,
3391                         fl->fl_u.nfs4_fl.owner);
3392         if (data == NULL)
3393                 return -ENOMEM;
3394         if (IS_SETLKW(cmd))
3395                 data->arg.block = 1;
3396         if (reclaim != 0)
3397                 data->arg.reclaim = 1;
3398         task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC,
3399                         &nfs4_lock_ops, data);
3400         if (IS_ERR(task))
3401                 return PTR_ERR(task);
3402         ret = nfs4_wait_for_completion_rpc_task(task);
3403         if (ret == 0) {
3404                 ret = data->rpc_status;
3405                 if (ret == -NFS4ERR_DENIED)
3406                         ret = -EAGAIN;
3407         } else
3408                 data->cancelled = 1;
3409         rpc_release_task(task);
3410         dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret);
3411         return ret;
3412 }
3413
3414 static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
3415 {
3416         struct nfs_server *server = NFS_SERVER(state->inode);
3417         struct nfs4_exception exception = { };
3418         int err;
3419
3420         /* Cache the lock if possible... */
3421         if (test_bit(NFS_DELEGATED_STATE, &state->flags))
3422                 return 0;
3423         do {
3424                 err = _nfs4_do_setlk(state, F_SETLK, request, 1);
3425                 if (err != -NFS4ERR_DELAY)
3426                         break;
3427                 nfs4_handle_exception(server, err, &exception);
3428         } while (exception.retry);
3429         return err;
3430 }
3431
3432 static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
3433 {
3434         struct nfs_server *server = NFS_SERVER(state->inode);
3435         struct nfs4_exception exception = { };
3436         int err;
3437
3438         err = nfs4_set_lock_state(state, request);
3439         if (err != 0)
3440                 return err;
3441         do {
3442                 err = _nfs4_do_setlk(state, F_SETLK, request, 0);
3443                 if (err != -NFS4ERR_DELAY)
3444                         break;
3445                 nfs4_handle_exception(server, err, &exception);
3446         } while (exception.retry);
3447         return err;
3448 }
3449
3450 static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3451 {
3452         struct nfs4_client *clp = state->owner->so_client;
3453         int status;
3454
3455         /* Is this a delegated open? */
3456         if (NFS_I(state->inode)->delegation_state != 0) {
3457                 /* Yes: cache locks! */
3458                 status = do_vfs_lock(request->fl_file, request);
3459                 /* ...but avoid races with delegation recall... */
3460                 if (status < 0 || test_bit(NFS_DELEGATED_STATE, &state->flags))
3461                         return status;
3462         }
3463         down_read(&clp->cl_sem);
3464         status = nfs4_set_lock_state(state, request);
3465         if (status != 0)
3466                 goto out;
3467         status = _nfs4_do_setlk(state, cmd, request, 0);
3468         if (status != 0)
3469                 goto out;
3470         /* Note: we always want to sleep here! */
3471         request->fl_flags |= FL_SLEEP;
3472         if (do_vfs_lock(request->fl_file, request) < 0)
3473                 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
3474 out:
3475         up_read(&clp->cl_sem);
3476         return status;
3477 }
3478
3479 static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
3480 {
3481         struct nfs4_exception exception = { };
3482         int err;
3483
3484         do {
3485                 err = nfs4_handle_exception(NFS_SERVER(state->inode),
3486                                 _nfs4_proc_setlk(state, cmd, request),
3487                                 &exception);
3488         } while (exception.retry);
3489         return err;
3490 }
3491
3492 static int
3493 nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
3494 {
3495         struct nfs_open_context *ctx;
3496         struct nfs4_state *state;
3497         unsigned long timeout = NFS4_LOCK_MINTIMEOUT;
3498         int status;
3499
3500         /* verify open state */
3501         ctx = (struct nfs_open_context *)filp->private_data;
3502         state = ctx->state;
3503
3504         if (request->fl_start < 0 || request->fl_end < 0)
3505                 return -EINVAL;
3506
3507         if (IS_GETLK(cmd))
3508                 return nfs4_proc_getlk(state, F_GETLK, request);
3509
3510         if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
3511                 return -EINVAL;
3512
3513         if (request->fl_type == F_UNLCK)
3514                 return nfs4_proc_unlck(state, cmd, request);
3515
3516         do {
3517                 status = nfs4_proc_setlk(state, cmd, request);
3518                 if ((status != -EAGAIN) || IS_SETLK(cmd))
3519                         break;
3520                 timeout = nfs4_set_lock_task_retry(timeout);
3521                 status = -ERESTARTSYS;
3522                 if (signalled())
3523                         break;
3524         } while(status < 0);
3525         return status;
3526 }
3527
3528 int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl)
3529 {
3530         struct nfs_server *server = NFS_SERVER(state->inode);
3531         struct nfs4_exception exception = { };
3532         int err;
3533
3534         err = nfs4_set_lock_state(state, fl);
3535         if (err != 0)
3536                 goto out;
3537         do {
3538                 err = _nfs4_do_setlk(state, F_SETLK, fl, 0);
3539                 if (err != -NFS4ERR_DELAY)
3540                         break;
3541                 err = nfs4_handle_exception(server, err, &exception);
3542         } while (exception.retry);
3543 out:
3544         return err;
3545 }
3546
3547 #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
3548
3549 int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf,
3550                 size_t buflen, int flags)
3551 {
3552         struct inode *inode = dentry->d_inode;
3553
3554         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3555                 return -EOPNOTSUPP;
3556
3557         if (!S_ISREG(inode->i_mode) &&
3558             (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
3559                 return -EPERM;
3560
3561         return nfs4_proc_set_acl(inode, buf, buflen);
3562 }
3563
3564 /* The getxattr man page suggests returning -ENODATA for unknown attributes,
3565  * and that's what we'll do for e.g. user attributes that haven't been set.
3566  * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported
3567  * attributes in kernel-managed attribute namespaces. */
3568 ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf,
3569                 size_t buflen)
3570 {
3571         struct inode *inode = dentry->d_inode;
3572
3573         if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0)
3574                 return -EOPNOTSUPP;
3575
3576         return nfs4_proc_get_acl(inode, buf, buflen);
3577 }
3578
3579 ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen)
3580 {
3581         size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1;
3582
3583         if (!nfs4_server_supports_acls(NFS_SERVER(dentry->d_inode)))
3584                 return 0;
3585         if (buf && buflen < len)
3586                 return -ERANGE;
3587         if (buf)
3588                 memcpy(buf, XATTR_NAME_NFSV4_ACL, len);
3589         return len;
3590 }
3591
3592 int nfs4_proc_fs_locations(struct inode *dir, struct dentry *dentry,
3593                 struct nfs4_fs_locations *fs_locations, struct page *page)
3594 {
3595         struct nfs_server *server = NFS_SERVER(dir);
3596         u32 bitmask[2] = {
3597                 [0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
3598                 [1] = FATTR4_WORD1_MOUNTED_ON_FILEID,
3599         };
3600         struct nfs4_fs_locations_arg args = {
3601                 .dir_fh = NFS_FH(dir),
3602                 .name = &dentry->d_name,
3603                 .page = page,
3604                 .bitmask = bitmask,
3605         };
3606         struct rpc_message msg = {
3607                 .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
3608                 .rpc_argp = &args,
3609                 .rpc_resp = fs_locations,
3610         };
3611         int status;
3612
3613         dprintk("%s: start\n", __FUNCTION__);
3614         fs_locations->fattr.valid = 0;
3615         fs_locations->server = server;
3616         fs_locations->nlocations = 0;
3617         status = rpc_call_sync(server->client, &msg, 0);
3618         dprintk("%s: returned status = %d\n", __FUNCTION__, status);
3619         return status;
3620 }
3621
3622 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
3623         .recover_open   = nfs4_open_reclaim,
3624         .recover_lock   = nfs4_lock_reclaim,
3625 };
3626
3627 struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = {
3628         .recover_open   = nfs4_open_expired,
3629         .recover_lock   = nfs4_lock_expired,
3630 };
3631
3632 static struct inode_operations nfs4_file_inode_operations = {
3633         .permission     = nfs_permission,
3634         .getattr        = nfs_getattr,
3635         .setattr        = nfs_setattr,
3636         .getxattr       = nfs4_getxattr,
3637         .setxattr       = nfs4_setxattr,
3638         .listxattr      = nfs4_listxattr,
3639 };
3640
3641 struct nfs_rpc_ops      nfs_v4_clientops = {
3642         .version        = 4,                    /* protocol version */
3643         .dentry_ops     = &nfs4_dentry_operations,
3644         .dir_inode_ops  = &nfs4_dir_inode_operations,
3645         .file_inode_ops = &nfs4_file_inode_operations,
3646         .getroot        = nfs4_proc_get_root,
3647         .getattr        = nfs4_proc_getattr,
3648         .setattr        = nfs4_proc_setattr,
3649         .lookup         = nfs4_proc_lookup,
3650         .access         = nfs4_proc_access,
3651         .readlink       = nfs4_proc_readlink,
3652         .read           = nfs4_proc_read,
3653         .write          = nfs4_proc_write,
3654         .commit         = nfs4_proc_commit,
3655         .create         = nfs4_proc_create,
3656         .remove         = nfs4_proc_remove,
3657         .unlink_setup   = nfs4_proc_unlink_setup,
3658         .unlink_done    = nfs4_proc_unlink_done,
3659         .rename         = nfs4_proc_rename,
3660         .link           = nfs4_proc_link,
3661         .symlink        = nfs4_proc_symlink,
3662         .mkdir          = nfs4_proc_mkdir,
3663         .rmdir          = nfs4_proc_remove,
3664         .readdir        = nfs4_proc_readdir,
3665         .mknod          = nfs4_proc_mknod,
3666         .statfs         = nfs4_proc_statfs,
3667         .fsinfo         = nfs4_proc_fsinfo,
3668         .pathconf       = nfs4_proc_pathconf,
3669         .decode_dirent  = nfs4_decode_dirent,
3670         .read_setup     = nfs4_proc_read_setup,
3671         .read_done      = nfs4_read_done,
3672         .write_setup    = nfs4_proc_write_setup,
3673         .write_done     = nfs4_write_done,
3674         .commit_setup   = nfs4_proc_commit_setup,
3675         .commit_done    = nfs4_commit_done,
3676         .file_open      = nfs_open,
3677         .file_release   = nfs_release,
3678         .lock           = nfs4_proc_lock,
3679         .clear_acl_cache = nfs4_zap_acl_attr,
3680 };
3681
3682 /*
3683  * Local variables:
3684  *  c-basic-offset: 8
3685  * End:
3686  */